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Reid Spencer5f016e22007-07-11 17:01:13 +00001//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===//
2//
3// The LLVM Compiler Infrastructure
4//
Chris Lattner0bc735f2007-12-29 19:59:25 +00005// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
Reid Spencer5f016e22007-07-11 17:01:13 +00007//
8//===----------------------------------------------------------------------===//
9//
10// This file implements semantic analysis for expressions.
11//
12//===----------------------------------------------------------------------===//
13
John McCall2d887082010-08-25 22:03:47 +000014#include "clang/Sema/SemaInternal.h"
Douglas Gregore737f502010-08-12 20:07:10 +000015#include "clang/Sema/Initialization.h"
16#include "clang/Sema/Lookup.h"
17#include "clang/Sema/AnalysisBasedWarnings.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000018#include "clang/AST/ASTContext.h"
Sebastian Redlf79a7192011-04-29 08:19:30 +000019#include "clang/AST/ASTMutationListener.h"
Douglas Gregorcc8a5d52010-04-29 00:18:15 +000020#include "clang/AST/CXXInheritance.h"
Daniel Dunbarc4a1dea2008-08-11 05:35:13 +000021#include "clang/AST/DeclObjC.h"
Anders Carlssond497ba72009-08-26 22:59:12 +000022#include "clang/AST/DeclTemplate.h"
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +000023#include "clang/AST/EvaluatedExprVisitor.h"
Douglas Gregor8ecdb652010-04-28 22:16:22 +000024#include "clang/AST/Expr.h"
Chris Lattner04421082008-04-08 04:40:51 +000025#include "clang/AST/ExprCXX.h"
Steve Narofff494b572008-05-29 21:12:08 +000026#include "clang/AST/ExprObjC.h"
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000027#include "clang/AST/RecursiveASTVisitor.h"
Douglas Gregor8ecdb652010-04-28 22:16:22 +000028#include "clang/AST/TypeLoc.h"
Anders Carlssond497ba72009-08-26 22:59:12 +000029#include "clang/Basic/PartialDiagnostic.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000030#include "clang/Basic/SourceManager.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000031#include "clang/Basic/TargetInfo.h"
Anders Carlssond497ba72009-08-26 22:59:12 +000032#include "clang/Lex/LiteralSupport.h"
33#include "clang/Lex/Preprocessor.h"
John McCall19510852010-08-20 18:27:03 +000034#include "clang/Sema/DeclSpec.h"
35#include "clang/Sema/Designator.h"
36#include "clang/Sema/Scope.h"
John McCall781472f2010-08-25 08:40:02 +000037#include "clang/Sema/ScopeInfo.h"
John McCall19510852010-08-20 18:27:03 +000038#include "clang/Sema/ParsedTemplate.h"
John McCall7cd088e2010-08-24 07:21:54 +000039#include "clang/Sema/Template.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000040using namespace clang;
John McCall781472f2010-08-25 08:40:02 +000041using namespace sema;
Reid Spencer5f016e22007-07-11 17:01:13 +000042
David Chisnall0f436562009-08-17 16:35:33 +000043
Douglas Gregor48f3bb92009-02-18 21:56:37 +000044/// \brief Determine whether the use of this declaration is valid, and
45/// emit any corresponding diagnostics.
46///
47/// This routine diagnoses various problems with referencing
48/// declarations that can occur when using a declaration. For example,
49/// it might warn if a deprecated or unavailable declaration is being
50/// used, or produce an error (and return true) if a C++0x deleted
51/// function is being used.
52///
Fariborz Jahanian8e5fc9b2010-12-21 00:44:01 +000053/// If IgnoreDeprecated is set to true, this should not warn about deprecated
Chris Lattner52338262009-10-25 22:31:57 +000054/// decls.
55///
Douglas Gregor48f3bb92009-02-18 21:56:37 +000056/// \returns true if there was an error (this declaration cannot be
57/// referenced), false otherwise.
Chris Lattner52338262009-10-25 22:31:57 +000058///
Fariborz Jahanian8e5fc9b2010-12-21 00:44:01 +000059bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc,
Fariborz Jahanian89ebaed2011-04-23 17:27:19 +000060 const ObjCInterfaceDecl *UnknownObjCClass) {
Douglas Gregor9b623632010-10-12 23:32:35 +000061 if (getLangOptions().CPlusPlus && isa<FunctionDecl>(D)) {
62 // If there were any diagnostics suppressed by template argument deduction,
63 // emit them now.
64 llvm::DenseMap<Decl *, llvm::SmallVector<PartialDiagnosticAt, 1> >::iterator
65 Pos = SuppressedDiagnostics.find(D->getCanonicalDecl());
66 if (Pos != SuppressedDiagnostics.end()) {
67 llvm::SmallVectorImpl<PartialDiagnosticAt> &Suppressed = Pos->second;
68 for (unsigned I = 0, N = Suppressed.size(); I != N; ++I)
69 Diag(Suppressed[I].first, Suppressed[I].second);
70
71 // Clear out the list of suppressed diagnostics, so that we don't emit
Douglas Gregor0a0d2b12011-03-23 00:50:03 +000072 // them again for this specialization. However, we don't obsolete this
Douglas Gregor9b623632010-10-12 23:32:35 +000073 // entry from the table, because we want to avoid ever emitting these
74 // diagnostics again.
75 Suppressed.clear();
76 }
77 }
78
Richard Smith34b41d92011-02-20 03:19:35 +000079 // See if this is an auto-typed variable whose initializer we are parsing.
Richard Smith483b9f32011-02-21 20:05:19 +000080 if (ParsingInitForAutoVars.count(D)) {
81 Diag(Loc, diag::err_auto_variable_cannot_appear_in_own_initializer)
82 << D->getDeclName();
83 return true;
Richard Smith34b41d92011-02-20 03:19:35 +000084 }
85
Douglas Gregor48f3bb92009-02-18 21:56:37 +000086 // See if this is a deleted function.
Douglas Gregor25d944a2009-02-24 04:26:15 +000087 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
Douglas Gregor48f3bb92009-02-18 21:56:37 +000088 if (FD->isDeleted()) {
89 Diag(Loc, diag::err_deleted_function_use);
John McCallf85e1932011-06-15 23:02:42 +000090 Diag(D->getLocation(), diag::note_unavailable_here) << 1 << true;
Douglas Gregor48f3bb92009-02-18 21:56:37 +000091 return true;
92 }
Douglas Gregor25d944a2009-02-24 04:26:15 +000093 }
Douglas Gregor48f3bb92009-02-18 21:56:37 +000094
Douglas Gregor0a0d2b12011-03-23 00:50:03 +000095 // See if this declaration is unavailable or deprecated.
96 std::string Message;
97 switch (D->getAvailability(&Message)) {
98 case AR_Available:
99 case AR_NotYetIntroduced:
100 break;
101
102 case AR_Deprecated:
103 EmitDeprecationWarning(D, Message, Loc, UnknownObjCClass);
104 break;
105
106 case AR_Unavailable:
Argyrios Kyrtzidis12189f52011-06-17 17:28:30 +0000107 if (cast<Decl>(CurContext)->getAvailability() != AR_Unavailable) {
108 if (Message.empty()) {
109 if (!UnknownObjCClass)
110 Diag(Loc, diag::err_unavailable) << D->getDeclName();
111 else
112 Diag(Loc, diag::warn_unavailable_fwdclass_message)
113 << D->getDeclName();
114 }
115 else
116 Diag(Loc, diag::err_unavailable_message)
117 << D->getDeclName() << Message;
118 Diag(D->getLocation(), diag::note_unavailable_here)
119 << isa<FunctionDecl>(D) << false;
Douglas Gregor0a0d2b12011-03-23 00:50:03 +0000120 }
Douglas Gregor0a0d2b12011-03-23 00:50:03 +0000121 break;
122 }
123
Anders Carlsson2127ecc2010-10-22 23:37:08 +0000124 // Warn if this is used but marked unused.
125 if (D->hasAttr<UnusedAttr>())
126 Diag(Loc, diag::warn_used_but_marked_unused) << D->getDeclName();
127
Douglas Gregor48f3bb92009-02-18 21:56:37 +0000128 return false;
Chris Lattner76a642f2009-02-15 22:43:40 +0000129}
130
Douglas Gregor0a0d2b12011-03-23 00:50:03 +0000131/// \brief Retrieve the message suffix that should be added to a
132/// diagnostic complaining about the given function being deleted or
133/// unavailable.
134std::string Sema::getDeletedOrUnavailableSuffix(const FunctionDecl *FD) {
135 // FIXME: C++0x implicitly-deleted special member functions could be
136 // detected here so that we could improve diagnostics to say, e.g.,
137 // "base class 'A' had a deleted copy constructor".
138 if (FD->isDeleted())
139 return std::string();
140
141 std::string Message;
142 if (FD->getAvailability(&Message))
143 return ": " + Message;
144
145 return std::string();
146}
147
Fariborz Jahanian5b530052009-05-13 18:09:35 +0000148/// DiagnoseSentinelCalls - This routine checks on method dispatch calls
Mike Stump1eb44332009-09-09 15:08:12 +0000149/// (and other functions in future), which have been declared with sentinel
Fariborz Jahanian5b530052009-05-13 18:09:35 +0000150/// attribute. It warns if call does not have the sentinel argument.
151///
152void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc,
Mike Stump1eb44332009-09-09 15:08:12 +0000153 Expr **Args, unsigned NumArgs) {
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000154 const SentinelAttr *attr = D->getAttr<SentinelAttr>();
Mike Stump1eb44332009-09-09 15:08:12 +0000155 if (!attr)
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000156 return;
Douglas Gregor92e986e2010-04-22 16:44:27 +0000157
158 // FIXME: In C++0x, if any of the arguments are parameter pack
159 // expansions, we can't check for the sentinel now.
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000160 int sentinelPos = attr->getSentinel();
161 int nullPos = attr->getNullPos();
Mike Stump1eb44332009-09-09 15:08:12 +0000162
Mike Stump390b4cc2009-05-16 07:39:55 +0000163 // FIXME. ObjCMethodDecl and FunctionDecl need be derived from the same common
164 // base class. Then we won't be needing two versions of the same code.
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000165 unsigned int i = 0;
Fariborz Jahanian236673e2009-05-14 18:00:00 +0000166 bool warnNotEnoughArgs = false;
167 int isMethod = 0;
168 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
169 // skip over named parameters.
170 ObjCMethodDecl::param_iterator P, E = MD->param_end();
171 for (P = MD->param_begin(); (P != E && i < NumArgs); ++P) {
172 if (nullPos)
173 --nullPos;
174 else
175 ++i;
176 }
177 warnNotEnoughArgs = (P != E || i >= NumArgs);
178 isMethod = 1;
Mike Stumpac5fc7c2009-08-04 21:02:39 +0000179 } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
Fariborz Jahanian236673e2009-05-14 18:00:00 +0000180 // skip over named parameters.
181 ObjCMethodDecl::param_iterator P, E = FD->param_end();
182 for (P = FD->param_begin(); (P != E && i < NumArgs); ++P) {
183 if (nullPos)
184 --nullPos;
185 else
186 ++i;
187 }
188 warnNotEnoughArgs = (P != E || i >= NumArgs);
Mike Stumpac5fc7c2009-08-04 21:02:39 +0000189 } else if (VarDecl *V = dyn_cast<VarDecl>(D)) {
Fariborz Jahaniandaf04152009-05-15 20:33:25 +0000190 // block or function pointer call.
191 QualType Ty = V->getType();
192 if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) {
Mike Stump1eb44332009-09-09 15:08:12 +0000193 const FunctionType *FT = Ty->isFunctionPointerType()
John McCall183700f2009-09-21 23:43:11 +0000194 ? Ty->getAs<PointerType>()->getPointeeType()->getAs<FunctionType>()
195 : Ty->getAs<BlockPointerType>()->getPointeeType()->getAs<FunctionType>();
Fariborz Jahaniandaf04152009-05-15 20:33:25 +0000196 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FT)) {
197 unsigned NumArgsInProto = Proto->getNumArgs();
198 unsigned k;
199 for (k = 0; (k != NumArgsInProto && i < NumArgs); k++) {
200 if (nullPos)
201 --nullPos;
202 else
203 ++i;
204 }
205 warnNotEnoughArgs = (k != NumArgsInProto || i >= NumArgs);
206 }
207 if (Ty->isBlockPointerType())
208 isMethod = 2;
Mike Stumpac5fc7c2009-08-04 21:02:39 +0000209 } else
Fariborz Jahaniandaf04152009-05-15 20:33:25 +0000210 return;
Mike Stumpac5fc7c2009-08-04 21:02:39 +0000211 } else
Fariborz Jahanian236673e2009-05-14 18:00:00 +0000212 return;
213
214 if (warnNotEnoughArgs) {
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000215 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName();
Fariborz Jahanian236673e2009-05-14 18:00:00 +0000216 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod;
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000217 return;
218 }
219 int sentinel = i;
220 while (sentinelPos > 0 && i < NumArgs-1) {
221 --sentinelPos;
222 ++i;
223 }
224 if (sentinelPos > 0) {
225 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName();
Fariborz Jahanian236673e2009-05-14 18:00:00 +0000226 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod;
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000227 return;
228 }
229 while (i < NumArgs-1) {
230 ++i;
231 ++sentinel;
232 }
233 Expr *sentinelExpr = Args[sentinel];
John McCall8eb662e2010-05-06 23:53:00 +0000234 if (!sentinelExpr) return;
235 if (sentinelExpr->isTypeDependent()) return;
236 if (sentinelExpr->isValueDependent()) return;
Anders Carlsson343e6ff2010-11-05 15:21:33 +0000237
238 // nullptr_t is always treated as null.
239 if (sentinelExpr->getType()->isNullPtrType()) return;
240
Fariborz Jahanian9ccd7252010-07-14 16:37:51 +0000241 if (sentinelExpr->getType()->isAnyPointerType() &&
John McCall8eb662e2010-05-06 23:53:00 +0000242 sentinelExpr->IgnoreParenCasts()->isNullPointerConstant(Context,
243 Expr::NPC_ValueDependentIsNull))
244 return;
245
246 // Unfortunately, __null has type 'int'.
247 if (isa<GNUNullExpr>(sentinelExpr)) return;
248
249 Diag(Loc, diag::warn_missing_sentinel) << isMethod;
250 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod;
Fariborz Jahanian5b530052009-05-13 18:09:35 +0000251}
252
Douglas Gregor4b2d3f72009-02-26 21:00:50 +0000253SourceRange Sema::getExprRange(ExprTy *E) const {
254 Expr *Ex = (Expr *)E;
255 return Ex? Ex->getSourceRange() : SourceRange();
256}
257
Chris Lattnere7a2e912008-07-25 21:10:04 +0000258//===----------------------------------------------------------------------===//
259// Standard Promotions and Conversions
260//===----------------------------------------------------------------------===//
261
Chris Lattnere7a2e912008-07-25 21:10:04 +0000262/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4).
John Wiegley429bb272011-04-08 18:41:53 +0000263ExprResult Sema::DefaultFunctionArrayConversion(Expr *E) {
Chris Lattnere7a2e912008-07-25 21:10:04 +0000264 QualType Ty = E->getType();
265 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type");
266
Chris Lattnere7a2e912008-07-25 21:10:04 +0000267 if (Ty->isFunctionType())
John Wiegley429bb272011-04-08 18:41:53 +0000268 E = ImpCastExprToType(E, Context.getPointerType(Ty),
269 CK_FunctionToPointerDecay).take();
Chris Lattner67d33d82008-07-25 21:33:13 +0000270 else if (Ty->isArrayType()) {
271 // In C90 mode, arrays only promote to pointers if the array expression is
272 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has
273 // type 'array of type' is converted to an expression that has type 'pointer
274 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression
275 // that has type 'array of type' ...". The relevant change is "an lvalue"
276 // (C90) to "an expression" (C99).
Argyrios Kyrtzidisc39a3d72008-09-11 04:25:59 +0000277 //
278 // C++ 4.2p1:
279 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of
280 // T" can be converted to an rvalue of type "pointer to T".
281 //
John McCall7eb0a9e2010-11-24 05:12:34 +0000282 if (getLangOptions().C99 || getLangOptions().CPlusPlus || E->isLValue())
John Wiegley429bb272011-04-08 18:41:53 +0000283 E = ImpCastExprToType(E, Context.getArrayDecayedType(Ty),
284 CK_ArrayToPointerDecay).take();
Chris Lattner67d33d82008-07-25 21:33:13 +0000285 }
John Wiegley429bb272011-04-08 18:41:53 +0000286 return Owned(E);
Chris Lattnere7a2e912008-07-25 21:10:04 +0000287}
288
Argyrios Kyrtzidis8a285ae2011-04-26 17:41:22 +0000289static void CheckForNullPointerDereference(Sema &S, Expr *E) {
290 // Check to see if we are dereferencing a null pointer. If so,
291 // and if not volatile-qualified, this is undefined behavior that the
292 // optimizer will delete, so warn about it. People sometimes try to use this
293 // to get a deterministic trap and are surprised by clang's behavior. This
294 // only handles the pattern "*null", which is a very syntactic check.
295 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E->IgnoreParenCasts()))
296 if (UO->getOpcode() == UO_Deref &&
297 UO->getSubExpr()->IgnoreParenCasts()->
298 isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull) &&
299 !UO->getType().isVolatileQualified()) {
300 S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
301 S.PDiag(diag::warn_indirection_through_null)
302 << UO->getSubExpr()->getSourceRange());
303 S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
304 S.PDiag(diag::note_indirection_through_null));
305 }
306}
307
John Wiegley429bb272011-04-08 18:41:53 +0000308ExprResult Sema::DefaultLvalueConversion(Expr *E) {
John McCall0ae287a2010-12-01 04:43:34 +0000309 // C++ [conv.lval]p1:
310 // A glvalue of a non-function, non-array type T can be
311 // converted to a prvalue.
John Wiegley429bb272011-04-08 18:41:53 +0000312 if (!E->isGLValue()) return Owned(E);
John McCallf6a16482010-12-04 03:47:34 +0000313
John McCall409fa9a2010-12-06 20:48:59 +0000314 QualType T = E->getType();
315 assert(!T.isNull() && "r-value conversion on typeless expression?");
John McCallf6a16482010-12-04 03:47:34 +0000316
John McCall409fa9a2010-12-06 20:48:59 +0000317 // Create a load out of an ObjCProperty l-value, if necessary.
318 if (E->getObjectKind() == OK_ObjCProperty) {
John Wiegley429bb272011-04-08 18:41:53 +0000319 ExprResult Res = ConvertPropertyForRValue(E);
320 if (Res.isInvalid())
321 return Owned(E);
322 E = Res.take();
John McCall409fa9a2010-12-06 20:48:59 +0000323 if (!E->isGLValue())
John Wiegley429bb272011-04-08 18:41:53 +0000324 return Owned(E);
Douglas Gregora873dfc2010-02-03 00:27:59 +0000325 }
John McCall409fa9a2010-12-06 20:48:59 +0000326
327 // We don't want to throw lvalue-to-rvalue casts on top of
328 // expressions of certain types in C++.
329 if (getLangOptions().CPlusPlus &&
330 (E->getType() == Context.OverloadTy ||
331 T->isDependentType() ||
332 T->isRecordType()))
John Wiegley429bb272011-04-08 18:41:53 +0000333 return Owned(E);
John McCall409fa9a2010-12-06 20:48:59 +0000334
335 // The C standard is actually really unclear on this point, and
336 // DR106 tells us what the result should be but not why. It's
337 // generally best to say that void types just doesn't undergo
338 // lvalue-to-rvalue at all. Note that expressions of unqualified
339 // 'void' type are never l-values, but qualified void can be.
340 if (T->isVoidType())
John Wiegley429bb272011-04-08 18:41:53 +0000341 return Owned(E);
John McCall409fa9a2010-12-06 20:48:59 +0000342
Argyrios Kyrtzidis8a285ae2011-04-26 17:41:22 +0000343 CheckForNullPointerDereference(*this, E);
344
John McCall409fa9a2010-12-06 20:48:59 +0000345 // C++ [conv.lval]p1:
346 // [...] If T is a non-class type, the type of the prvalue is the
347 // cv-unqualified version of T. Otherwise, the type of the
348 // rvalue is T.
349 //
350 // C99 6.3.2.1p2:
351 // If the lvalue has qualified type, the value has the unqualified
352 // version of the type of the lvalue; otherwise, the value has the
353 // type of the lvalue.
354 if (T.hasQualifiers())
355 T = T.getUnqualifiedType();
356
Ted Kremenek3aea4da2011-03-01 18:41:00 +0000357 CheckArrayAccess(E);
Ted Kremeneka0125d82011-02-16 01:57:07 +0000358
John Wiegley429bb272011-04-08 18:41:53 +0000359 return Owned(ImplicitCastExpr::Create(Context, T, CK_LValueToRValue,
360 E, 0, VK_RValue));
John McCall409fa9a2010-12-06 20:48:59 +0000361}
362
John Wiegley429bb272011-04-08 18:41:53 +0000363ExprResult Sema::DefaultFunctionArrayLvalueConversion(Expr *E) {
364 ExprResult Res = DefaultFunctionArrayConversion(E);
365 if (Res.isInvalid())
366 return ExprError();
367 Res = DefaultLvalueConversion(Res.take());
368 if (Res.isInvalid())
369 return ExprError();
370 return move(Res);
Douglas Gregora873dfc2010-02-03 00:27:59 +0000371}
372
373
Chris Lattnere7a2e912008-07-25 21:10:04 +0000374/// UsualUnaryConversions - Performs various conversions that are common to most
Mike Stump1eb44332009-09-09 15:08:12 +0000375/// operators (C99 6.3). The conversions of array and function types are
Chris Lattnerfc8f0e12011-04-15 05:22:18 +0000376/// sometimes suppressed. For example, the array->pointer conversion doesn't
Chris Lattnere7a2e912008-07-25 21:10:04 +0000377/// apply if the array is an argument to the sizeof or address (&) operators.
378/// In these instances, this routine should *not* be called.
John Wiegley429bb272011-04-08 18:41:53 +0000379ExprResult Sema::UsualUnaryConversions(Expr *E) {
John McCall0ae287a2010-12-01 04:43:34 +0000380 // First, convert to an r-value.
John Wiegley429bb272011-04-08 18:41:53 +0000381 ExprResult Res = DefaultFunctionArrayLvalueConversion(E);
382 if (Res.isInvalid())
383 return Owned(E);
384 E = Res.take();
John McCall0ae287a2010-12-01 04:43:34 +0000385
386 QualType Ty = E->getType();
Chris Lattnere7a2e912008-07-25 21:10:04 +0000387 assert(!Ty.isNull() && "UsualUnaryConversions - missing type");
John McCall0ae287a2010-12-01 04:43:34 +0000388
389 // Try to perform integral promotions if the object has a theoretically
390 // promotable type.
391 if (Ty->isIntegralOrUnscopedEnumerationType()) {
392 // C99 6.3.1.1p2:
393 //
394 // The following may be used in an expression wherever an int or
395 // unsigned int may be used:
396 // - an object or expression with an integer type whose integer
397 // conversion rank is less than or equal to the rank of int
398 // and unsigned int.
399 // - A bit-field of type _Bool, int, signed int, or unsigned int.
400 //
401 // If an int can represent all values of the original type, the
402 // value is converted to an int; otherwise, it is converted to an
403 // unsigned int. These are called the integer promotions. All
404 // other types are unchanged by the integer promotions.
405
406 QualType PTy = Context.isPromotableBitField(E);
407 if (!PTy.isNull()) {
John Wiegley429bb272011-04-08 18:41:53 +0000408 E = ImpCastExprToType(E, PTy, CK_IntegralCast).take();
409 return Owned(E);
John McCall0ae287a2010-12-01 04:43:34 +0000410 }
411 if (Ty->isPromotableIntegerType()) {
412 QualType PT = Context.getPromotedIntegerType(Ty);
John Wiegley429bb272011-04-08 18:41:53 +0000413 E = ImpCastExprToType(E, PT, CK_IntegralCast).take();
414 return Owned(E);
John McCall0ae287a2010-12-01 04:43:34 +0000415 }
Eli Friedman04e83572009-08-20 04:21:42 +0000416 }
John Wiegley429bb272011-04-08 18:41:53 +0000417 return Owned(E);
Chris Lattnere7a2e912008-07-25 21:10:04 +0000418}
419
Chris Lattner05faf172008-07-25 22:25:12 +0000420/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that
Mike Stump1eb44332009-09-09 15:08:12 +0000421/// do not have a prototype. Arguments that have type float are promoted to
Chris Lattner05faf172008-07-25 22:25:12 +0000422/// double. All other argument types are converted by UsualUnaryConversions().
John Wiegley429bb272011-04-08 18:41:53 +0000423ExprResult Sema::DefaultArgumentPromotion(Expr *E) {
424 QualType Ty = E->getType();
Chris Lattner05faf172008-07-25 22:25:12 +0000425 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type");
Mike Stump1eb44332009-09-09 15:08:12 +0000426
John Wiegley429bb272011-04-08 18:41:53 +0000427 ExprResult Res = UsualUnaryConversions(E);
428 if (Res.isInvalid())
429 return Owned(E);
430 E = Res.take();
John McCall40c29132010-12-06 18:36:11 +0000431
Chris Lattner05faf172008-07-25 22:25:12 +0000432 // If this is a 'float' (CVR qualified or typedef) promote to double.
Chris Lattner40378332010-05-16 04:01:30 +0000433 if (Ty->isSpecificBuiltinType(BuiltinType::Float))
John Wiegley429bb272011-04-08 18:41:53 +0000434 E = ImpCastExprToType(E, Context.DoubleTy, CK_FloatingCast).take();
435
436 return Owned(E);
Chris Lattner05faf172008-07-25 22:25:12 +0000437}
438
Chris Lattner312531a2009-04-12 08:11:20 +0000439/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but
440/// will warn if the resulting type is not a POD type, and rejects ObjC
John Wiegley429bb272011-04-08 18:41:53 +0000441/// interfaces passed by value.
442ExprResult Sema::DefaultVariadicArgumentPromotion(Expr *E, VariadicCallType CT,
John McCallf85e1932011-06-15 23:02:42 +0000443 FunctionDecl *FDecl) {
Douglas Gregor8d5e18c2011-06-17 00:15:10 +0000444 ExprResult ExprRes = CheckPlaceholderExpr(E);
445 if (ExprRes.isInvalid())
446 return ExprError();
447
448 ExprRes = DefaultArgumentPromotion(E);
John Wiegley429bb272011-04-08 18:41:53 +0000449 if (ExprRes.isInvalid())
450 return ExprError();
451 E = ExprRes.take();
Mike Stump1eb44332009-09-09 15:08:12 +0000452
Chris Lattner40378332010-05-16 04:01:30 +0000453 // __builtin_va_start takes the second argument as a "varargs" argument, but
454 // it doesn't actually do anything with it. It doesn't need to be non-pod
455 // etc.
456 if (FDecl && FDecl->getBuiltinID() == Builtin::BI__builtin_va_start)
John Wiegley429bb272011-04-08 18:41:53 +0000457 return Owned(E);
Chris Lattner40378332010-05-16 04:01:30 +0000458
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000459 // Don't allow one to pass an Objective-C interface to a vararg.
John Wiegley429bb272011-04-08 18:41:53 +0000460 if (E->getType()->isObjCObjectType() &&
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000461 DiagRuntimeBehavior(E->getLocStart(), 0,
462 PDiag(diag::err_cannot_pass_objc_interface_to_vararg)
463 << E->getType() << CT))
John Wiegley429bb272011-04-08 18:41:53 +0000464 return ExprError();
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000465
John McCallf85e1932011-06-15 23:02:42 +0000466 if (!E->getType().isPODType(Context)) {
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000467 // C++0x [expr.call]p7:
468 // Passing a potentially-evaluated argument of class type (Clause 9)
469 // having a non-trivial copy constructor, a non-trivial move constructor,
470 // or a non-trivial destructor, with no corresponding parameter,
471 // is conditionally-supported with implementation-defined semantics.
472 bool TrivialEnough = false;
473 if (getLangOptions().CPlusPlus0x && !E->getType()->isDependentType()) {
474 if (CXXRecordDecl *Record = E->getType()->getAsCXXRecordDecl()) {
475 if (Record->hasTrivialCopyConstructor() &&
476 Record->hasTrivialMoveConstructor() &&
477 Record->hasTrivialDestructor())
478 TrivialEnough = true;
479 }
480 }
John McCallf85e1932011-06-15 23:02:42 +0000481
482 if (!TrivialEnough &&
483 getLangOptions().ObjCAutoRefCount &&
484 E->getType()->isObjCLifetimeType())
485 TrivialEnough = true;
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000486
487 if (TrivialEnough) {
488 // Nothing to diagnose. This is okay.
489 } else if (DiagRuntimeBehavior(E->getLocStart(), 0,
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +0000490 PDiag(diag::warn_cannot_pass_non_pod_arg_to_vararg)
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000491 << getLangOptions().CPlusPlus0x << E->getType()
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000492 << CT)) {
493 // Turn this into a trap.
494 CXXScopeSpec SS;
495 UnqualifiedId Name;
496 Name.setIdentifier(PP.getIdentifierInfo("__builtin_trap"),
497 E->getLocStart());
498 ExprResult TrapFn = ActOnIdExpression(TUScope, SS, Name, true, false);
499 if (TrapFn.isInvalid())
500 return ExprError();
501
502 ExprResult Call = ActOnCallExpr(TUScope, TrapFn.get(), E->getLocStart(),
503 MultiExprArg(), E->getLocEnd());
504 if (Call.isInvalid())
505 return ExprError();
506
507 ExprResult Comma = ActOnBinOp(TUScope, E->getLocStart(), tok::comma,
508 Call.get(), E);
509 if (Comma.isInvalid())
510 return ExprError();
511
512 E = Comma.get();
513 }
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000514 }
515
John Wiegley429bb272011-04-08 18:41:53 +0000516 return Owned(E);
Anders Carlssondce5e2c2009-01-16 16:48:51 +0000517}
518
Chris Lattnere7a2e912008-07-25 21:10:04 +0000519/// UsualArithmeticConversions - Performs various conversions that are common to
520/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this
Mike Stump1eb44332009-09-09 15:08:12 +0000521/// routine returns the first non-arithmetic type found. The client is
Chris Lattnere7a2e912008-07-25 21:10:04 +0000522/// responsible for emitting appropriate error diagnostics.
523/// FIXME: verify the conversion rules for "complex int" are consistent with
524/// GCC.
John Wiegley429bb272011-04-08 18:41:53 +0000525QualType Sema::UsualArithmeticConversions(ExprResult &lhsExpr, ExprResult &rhsExpr,
Chris Lattnere7a2e912008-07-25 21:10:04 +0000526 bool isCompAssign) {
John Wiegley429bb272011-04-08 18:41:53 +0000527 if (!isCompAssign) {
528 lhsExpr = UsualUnaryConversions(lhsExpr.take());
529 if (lhsExpr.isInvalid())
530 return QualType();
531 }
Eli Friedmanab3a8522009-03-28 01:22:36 +0000532
John Wiegley429bb272011-04-08 18:41:53 +0000533 rhsExpr = UsualUnaryConversions(rhsExpr.take());
534 if (rhsExpr.isInvalid())
535 return QualType();
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000536
Mike Stump1eb44332009-09-09 15:08:12 +0000537 // For conversion purposes, we ignore any qualifiers.
Chris Lattnere7a2e912008-07-25 21:10:04 +0000538 // For example, "const float" and "float" are equivalent.
Chris Lattnerb77792e2008-07-26 22:17:49 +0000539 QualType lhs =
John Wiegley429bb272011-04-08 18:41:53 +0000540 Context.getCanonicalType(lhsExpr.get()->getType()).getUnqualifiedType();
Mike Stump1eb44332009-09-09 15:08:12 +0000541 QualType rhs =
John Wiegley429bb272011-04-08 18:41:53 +0000542 Context.getCanonicalType(rhsExpr.get()->getType()).getUnqualifiedType();
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000543
544 // If both types are identical, no conversion is needed.
545 if (lhs == rhs)
546 return lhs;
547
548 // If either side is a non-arithmetic type (e.g. a pointer), we are done.
549 // The caller can deal with this (e.g. pointer + int).
550 if (!lhs->isArithmeticType() || !rhs->isArithmeticType())
551 return lhs;
552
John McCallcf33b242010-11-13 08:17:45 +0000553 // Apply unary and bitfield promotions to the LHS's type.
554 QualType lhs_unpromoted = lhs;
555 if (lhs->isPromotableIntegerType())
556 lhs = Context.getPromotedIntegerType(lhs);
John Wiegley429bb272011-04-08 18:41:53 +0000557 QualType LHSBitfieldPromoteTy = Context.isPromotableBitField(lhsExpr.get());
Douglas Gregor2d833e32009-05-02 00:36:19 +0000558 if (!LHSBitfieldPromoteTy.isNull())
559 lhs = LHSBitfieldPromoteTy;
John McCallcf33b242010-11-13 08:17:45 +0000560 if (lhs != lhs_unpromoted && !isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000561 lhsExpr = ImpCastExprToType(lhsExpr.take(), lhs, CK_IntegralCast);
Douglas Gregor2d833e32009-05-02 00:36:19 +0000562
John McCallcf33b242010-11-13 08:17:45 +0000563 // If both types are identical, no conversion is needed.
564 if (lhs == rhs)
565 return lhs;
566
567 // At this point, we have two different arithmetic types.
568
569 // Handle complex types first (C99 6.3.1.8p1).
570 bool LHSComplexFloat = lhs->isComplexType();
571 bool RHSComplexFloat = rhs->isComplexType();
572 if (LHSComplexFloat || RHSComplexFloat) {
573 // if we have an integer operand, the result is the complex type.
574
John McCall2bb5d002010-11-13 09:02:35 +0000575 if (!RHSComplexFloat && !rhs->isRealFloatingType()) {
576 if (rhs->isIntegerType()) {
577 QualType fp = cast<ComplexType>(lhs)->getElementType();
John Wiegley429bb272011-04-08 18:41:53 +0000578 rhsExpr = ImpCastExprToType(rhsExpr.take(), fp, CK_IntegralToFloating);
579 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_FloatingRealToComplex);
John McCall2bb5d002010-11-13 09:02:35 +0000580 } else {
581 assert(rhs->isComplexIntegerType());
John Wiegley429bb272011-04-08 18:41:53 +0000582 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralComplexToFloatingComplex);
John McCall2bb5d002010-11-13 09:02:35 +0000583 }
John McCallcf33b242010-11-13 08:17:45 +0000584 return lhs;
585 }
586
John McCall2bb5d002010-11-13 09:02:35 +0000587 if (!LHSComplexFloat && !lhs->isRealFloatingType()) {
588 if (!isCompAssign) {
589 // int -> float -> _Complex float
590 if (lhs->isIntegerType()) {
591 QualType fp = cast<ComplexType>(rhs)->getElementType();
John Wiegley429bb272011-04-08 18:41:53 +0000592 lhsExpr = ImpCastExprToType(lhsExpr.take(), fp, CK_IntegralToFloating);
593 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_FloatingRealToComplex);
John McCall2bb5d002010-11-13 09:02:35 +0000594 } else {
595 assert(lhs->isComplexIntegerType());
John Wiegley429bb272011-04-08 18:41:53 +0000596 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_IntegralComplexToFloatingComplex);
John McCall2bb5d002010-11-13 09:02:35 +0000597 }
598 }
John McCallcf33b242010-11-13 08:17:45 +0000599 return rhs;
600 }
601
602 // This handles complex/complex, complex/float, or float/complex.
603 // When both operands are complex, the shorter operand is converted to the
604 // type of the longer, and that is the type of the result. This corresponds
605 // to what is done when combining two real floating-point operands.
606 // The fun begins when size promotion occur across type domains.
607 // From H&S 6.3.4: When one operand is complex and the other is a real
608 // floating-point type, the less precise type is converted, within it's
609 // real or complex domain, to the precision of the other type. For example,
610 // when combining a "long double" with a "double _Complex", the
611 // "double _Complex" is promoted to "long double _Complex".
612 int order = Context.getFloatingTypeOrder(lhs, rhs);
613
614 // If both are complex, just cast to the more precise type.
615 if (LHSComplexFloat && RHSComplexFloat) {
616 if (order > 0) {
617 // _Complex float -> _Complex double
John Wiegley429bb272011-04-08 18:41:53 +0000618 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_FloatingComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000619 return lhs;
620
621 } else if (order < 0) {
622 // _Complex float -> _Complex double
623 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000624 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_FloatingComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000625 return rhs;
626 }
627 return lhs;
628 }
629
630 // If just the LHS is complex, the RHS needs to be converted,
631 // and the LHS might need to be promoted.
632 if (LHSComplexFloat) {
633 if (order > 0) { // LHS is wider
634 // float -> _Complex double
John McCall2bb5d002010-11-13 09:02:35 +0000635 QualType fp = cast<ComplexType>(lhs)->getElementType();
John Wiegley429bb272011-04-08 18:41:53 +0000636 rhsExpr = ImpCastExprToType(rhsExpr.take(), fp, CK_FloatingCast);
637 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000638 return lhs;
639 }
640
641 // RHS is at least as wide. Find its corresponding complex type.
642 QualType result = (order == 0 ? lhs : Context.getComplexType(rhs));
643
644 // double -> _Complex double
John Wiegley429bb272011-04-08 18:41:53 +0000645 rhsExpr = ImpCastExprToType(rhsExpr.take(), result, CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000646
647 // _Complex float -> _Complex double
648 if (!isCompAssign && order < 0)
John Wiegley429bb272011-04-08 18:41:53 +0000649 lhsExpr = ImpCastExprToType(lhsExpr.take(), result, CK_FloatingComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000650
651 return result;
652 }
653
654 // Just the RHS is complex, so the LHS needs to be converted
655 // and the RHS might need to be promoted.
656 assert(RHSComplexFloat);
657
658 if (order < 0) { // RHS is wider
659 // float -> _Complex double
John McCall2bb5d002010-11-13 09:02:35 +0000660 if (!isCompAssign) {
Argyrios Kyrtzidise1889332011-01-18 18:49:33 +0000661 QualType fp = cast<ComplexType>(rhs)->getElementType();
John Wiegley429bb272011-04-08 18:41:53 +0000662 lhsExpr = ImpCastExprToType(lhsExpr.take(), fp, CK_FloatingCast);
663 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_FloatingRealToComplex);
John McCall2bb5d002010-11-13 09:02:35 +0000664 }
John McCallcf33b242010-11-13 08:17:45 +0000665 return rhs;
666 }
667
668 // LHS is at least as wide. Find its corresponding complex type.
669 QualType result = (order == 0 ? rhs : Context.getComplexType(lhs));
670
671 // double -> _Complex double
672 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000673 lhsExpr = ImpCastExprToType(lhsExpr.take(), result, CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000674
675 // _Complex float -> _Complex double
676 if (order > 0)
John Wiegley429bb272011-04-08 18:41:53 +0000677 rhsExpr = ImpCastExprToType(rhsExpr.take(), result, CK_FloatingComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000678
679 return result;
680 }
681
682 // Now handle "real" floating types (i.e. float, double, long double).
683 bool LHSFloat = lhs->isRealFloatingType();
684 bool RHSFloat = rhs->isRealFloatingType();
685 if (LHSFloat || RHSFloat) {
686 // If we have two real floating types, convert the smaller operand
687 // to the bigger result.
688 if (LHSFloat && RHSFloat) {
689 int order = Context.getFloatingTypeOrder(lhs, rhs);
690 if (order > 0) {
John Wiegley429bb272011-04-08 18:41:53 +0000691 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_FloatingCast);
John McCallcf33b242010-11-13 08:17:45 +0000692 return lhs;
693 }
694
695 assert(order < 0 && "illegal float comparison");
696 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000697 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_FloatingCast);
John McCallcf33b242010-11-13 08:17:45 +0000698 return rhs;
699 }
700
701 // If we have an integer operand, the result is the real floating type.
702 if (LHSFloat) {
703 if (rhs->isIntegerType()) {
704 // Convert rhs to the lhs floating point type.
John Wiegley429bb272011-04-08 18:41:53 +0000705 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralToFloating);
John McCallcf33b242010-11-13 08:17:45 +0000706 return lhs;
707 }
708
709 // Convert both sides to the appropriate complex float.
710 assert(rhs->isComplexIntegerType());
711 QualType result = Context.getComplexType(lhs);
712
713 // _Complex int -> _Complex float
John Wiegley429bb272011-04-08 18:41:53 +0000714 rhsExpr = ImpCastExprToType(rhsExpr.take(), result, CK_IntegralComplexToFloatingComplex);
John McCallcf33b242010-11-13 08:17:45 +0000715
716 // float -> _Complex float
717 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000718 lhsExpr = ImpCastExprToType(lhsExpr.take(), result, CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000719
720 return result;
721 }
722
723 assert(RHSFloat);
724 if (lhs->isIntegerType()) {
725 // Convert lhs to the rhs floating point type.
726 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000727 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_IntegralToFloating);
John McCallcf33b242010-11-13 08:17:45 +0000728 return rhs;
729 }
730
731 // Convert both sides to the appropriate complex float.
732 assert(lhs->isComplexIntegerType());
733 QualType result = Context.getComplexType(rhs);
734
735 // _Complex int -> _Complex float
736 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000737 lhsExpr = ImpCastExprToType(lhsExpr.take(), result, CK_IntegralComplexToFloatingComplex);
John McCallcf33b242010-11-13 08:17:45 +0000738
739 // float -> _Complex float
John Wiegley429bb272011-04-08 18:41:53 +0000740 rhsExpr = ImpCastExprToType(rhsExpr.take(), result, CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000741
742 return result;
743 }
744
745 // Handle GCC complex int extension.
746 // FIXME: if the operands are (int, _Complex long), we currently
747 // don't promote the complex. Also, signedness?
748 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType();
749 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType();
750 if (lhsComplexInt && rhsComplexInt) {
751 int order = Context.getIntegerTypeOrder(lhsComplexInt->getElementType(),
752 rhsComplexInt->getElementType());
753 assert(order && "inequal types with equal element ordering");
754 if (order > 0) {
755 // _Complex int -> _Complex long
John Wiegley429bb272011-04-08 18:41:53 +0000756 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000757 return lhs;
758 }
759
760 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000761 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_IntegralComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000762 return rhs;
763 } else if (lhsComplexInt) {
764 // int -> _Complex int
John Wiegley429bb272011-04-08 18:41:53 +0000765 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000766 return lhs;
767 } else if (rhsComplexInt) {
768 // int -> _Complex int
769 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000770 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_IntegralRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000771 return rhs;
772 }
773
774 // Finally, we have two differing integer types.
775 // The rules for this case are in C99 6.3.1.8
776 int compare = Context.getIntegerTypeOrder(lhs, rhs);
777 bool lhsSigned = lhs->hasSignedIntegerRepresentation(),
778 rhsSigned = rhs->hasSignedIntegerRepresentation();
779 if (lhsSigned == rhsSigned) {
780 // Same signedness; use the higher-ranked type
781 if (compare >= 0) {
John Wiegley429bb272011-04-08 18:41:53 +0000782 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000783 return lhs;
784 } else if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000785 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000786 return rhs;
787 } else if (compare != (lhsSigned ? 1 : -1)) {
788 // The unsigned type has greater than or equal rank to the
789 // signed type, so use the unsigned type
790 if (rhsSigned) {
John Wiegley429bb272011-04-08 18:41:53 +0000791 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000792 return lhs;
793 } else if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000794 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000795 return rhs;
796 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) {
797 // The two types are different widths; if we are here, that
798 // means the signed type is larger than the unsigned type, so
799 // use the signed type.
800 if (lhsSigned) {
John Wiegley429bb272011-04-08 18:41:53 +0000801 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000802 return lhs;
803 } else if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000804 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000805 return rhs;
806 } else {
807 // The signed type is higher-ranked than the unsigned type,
808 // but isn't actually any bigger (like unsigned int and long
809 // on most 32-bit systems). Use the unsigned type corresponding
810 // to the signed type.
811 QualType result =
812 Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs);
John Wiegley429bb272011-04-08 18:41:53 +0000813 rhsExpr = ImpCastExprToType(rhsExpr.take(), result, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000814 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000815 lhsExpr = ImpCastExprToType(lhsExpr.take(), result, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000816 return result;
817 }
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000818}
819
Chris Lattnere7a2e912008-07-25 21:10:04 +0000820//===----------------------------------------------------------------------===//
821// Semantic Analysis for various Expression Types
822//===----------------------------------------------------------------------===//
823
824
Peter Collingbournef111d932011-04-15 00:35:48 +0000825ExprResult
826Sema::ActOnGenericSelectionExpr(SourceLocation KeyLoc,
827 SourceLocation DefaultLoc,
828 SourceLocation RParenLoc,
829 Expr *ControllingExpr,
830 MultiTypeArg types,
831 MultiExprArg exprs) {
832 unsigned NumAssocs = types.size();
833 assert(NumAssocs == exprs.size());
834
835 ParsedType *ParsedTypes = types.release();
836 Expr **Exprs = exprs.release();
837
838 TypeSourceInfo **Types = new TypeSourceInfo*[NumAssocs];
839 for (unsigned i = 0; i < NumAssocs; ++i) {
840 if (ParsedTypes[i])
841 (void) GetTypeFromParser(ParsedTypes[i], &Types[i]);
842 else
843 Types[i] = 0;
844 }
845
846 ExprResult ER = CreateGenericSelectionExpr(KeyLoc, DefaultLoc, RParenLoc,
847 ControllingExpr, Types, Exprs,
848 NumAssocs);
Benjamin Kramer5bf47f72011-04-15 11:21:57 +0000849 delete [] Types;
Peter Collingbournef111d932011-04-15 00:35:48 +0000850 return ER;
851}
852
853ExprResult
854Sema::CreateGenericSelectionExpr(SourceLocation KeyLoc,
855 SourceLocation DefaultLoc,
856 SourceLocation RParenLoc,
857 Expr *ControllingExpr,
858 TypeSourceInfo **Types,
859 Expr **Exprs,
860 unsigned NumAssocs) {
861 bool TypeErrorFound = false,
862 IsResultDependent = ControllingExpr->isTypeDependent(),
863 ContainsUnexpandedParameterPack
864 = ControllingExpr->containsUnexpandedParameterPack();
865
866 for (unsigned i = 0; i < NumAssocs; ++i) {
867 if (Exprs[i]->containsUnexpandedParameterPack())
868 ContainsUnexpandedParameterPack = true;
869
870 if (Types[i]) {
871 if (Types[i]->getType()->containsUnexpandedParameterPack())
872 ContainsUnexpandedParameterPack = true;
873
874 if (Types[i]->getType()->isDependentType()) {
875 IsResultDependent = true;
876 } else {
877 // C1X 6.5.1.1p2 "The type name in a generic association shall specify a
878 // complete object type other than a variably modified type."
879 unsigned D = 0;
880 if (Types[i]->getType()->isIncompleteType())
881 D = diag::err_assoc_type_incomplete;
882 else if (!Types[i]->getType()->isObjectType())
883 D = diag::err_assoc_type_nonobject;
884 else if (Types[i]->getType()->isVariablyModifiedType())
885 D = diag::err_assoc_type_variably_modified;
886
887 if (D != 0) {
888 Diag(Types[i]->getTypeLoc().getBeginLoc(), D)
889 << Types[i]->getTypeLoc().getSourceRange()
890 << Types[i]->getType();
891 TypeErrorFound = true;
892 }
893
894 // C1X 6.5.1.1p2 "No two generic associations in the same generic
895 // selection shall specify compatible types."
896 for (unsigned j = i+1; j < NumAssocs; ++j)
897 if (Types[j] && !Types[j]->getType()->isDependentType() &&
898 Context.typesAreCompatible(Types[i]->getType(),
899 Types[j]->getType())) {
900 Diag(Types[j]->getTypeLoc().getBeginLoc(),
901 diag::err_assoc_compatible_types)
902 << Types[j]->getTypeLoc().getSourceRange()
903 << Types[j]->getType()
904 << Types[i]->getType();
905 Diag(Types[i]->getTypeLoc().getBeginLoc(),
906 diag::note_compat_assoc)
907 << Types[i]->getTypeLoc().getSourceRange()
908 << Types[i]->getType();
909 TypeErrorFound = true;
910 }
911 }
912 }
913 }
914 if (TypeErrorFound)
915 return ExprError();
916
917 // If we determined that the generic selection is result-dependent, don't
918 // try to compute the result expression.
919 if (IsResultDependent)
920 return Owned(new (Context) GenericSelectionExpr(
921 Context, KeyLoc, ControllingExpr,
922 Types, Exprs, NumAssocs, DefaultLoc,
923 RParenLoc, ContainsUnexpandedParameterPack));
924
925 llvm::SmallVector<unsigned, 1> CompatIndices;
926 unsigned DefaultIndex = -1U;
927 for (unsigned i = 0; i < NumAssocs; ++i) {
928 if (!Types[i])
929 DefaultIndex = i;
930 else if (Context.typesAreCompatible(ControllingExpr->getType(),
931 Types[i]->getType()))
932 CompatIndices.push_back(i);
933 }
934
935 // C1X 6.5.1.1p2 "The controlling expression of a generic selection shall have
936 // type compatible with at most one of the types named in its generic
937 // association list."
938 if (CompatIndices.size() > 1) {
939 // We strip parens here because the controlling expression is typically
940 // parenthesized in macro definitions.
941 ControllingExpr = ControllingExpr->IgnoreParens();
942 Diag(ControllingExpr->getLocStart(), diag::err_generic_sel_multi_match)
943 << ControllingExpr->getSourceRange() << ControllingExpr->getType()
944 << (unsigned) CompatIndices.size();
945 for (llvm::SmallVector<unsigned, 1>::iterator I = CompatIndices.begin(),
946 E = CompatIndices.end(); I != E; ++I) {
947 Diag(Types[*I]->getTypeLoc().getBeginLoc(),
948 diag::note_compat_assoc)
949 << Types[*I]->getTypeLoc().getSourceRange()
950 << Types[*I]->getType();
951 }
952 return ExprError();
953 }
954
955 // C1X 6.5.1.1p2 "If a generic selection has no default generic association,
956 // its controlling expression shall have type compatible with exactly one of
957 // the types named in its generic association list."
958 if (DefaultIndex == -1U && CompatIndices.size() == 0) {
959 // We strip parens here because the controlling expression is typically
960 // parenthesized in macro definitions.
961 ControllingExpr = ControllingExpr->IgnoreParens();
962 Diag(ControllingExpr->getLocStart(), diag::err_generic_sel_no_match)
963 << ControllingExpr->getSourceRange() << ControllingExpr->getType();
964 return ExprError();
965 }
966
967 // C1X 6.5.1.1p3 "If a generic selection has a generic association with a
968 // type name that is compatible with the type of the controlling expression,
969 // then the result expression of the generic selection is the expression
970 // in that generic association. Otherwise, the result expression of the
971 // generic selection is the expression in the default generic association."
972 unsigned ResultIndex =
973 CompatIndices.size() ? CompatIndices[0] : DefaultIndex;
974
975 return Owned(new (Context) GenericSelectionExpr(
976 Context, KeyLoc, ControllingExpr,
977 Types, Exprs, NumAssocs, DefaultLoc,
978 RParenLoc, ContainsUnexpandedParameterPack,
979 ResultIndex));
980}
981
Steve Narofff69936d2007-09-16 03:34:24 +0000982/// ActOnStringLiteral - The specified tokens were lexed as pasted string
Reid Spencer5f016e22007-07-11 17:01:13 +0000983/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string
984/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from
985/// multiple tokens. However, the common case is that StringToks points to one
986/// string.
Sebastian Redlcd965b92009-01-18 18:53:16 +0000987///
John McCall60d7b3a2010-08-24 06:29:42 +0000988ExprResult
Sean Hunt6cf75022010-08-30 17:47:05 +0000989Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000990 assert(NumStringToks && "Must have at least one string!");
991
Chris Lattnerbbee00b2009-01-16 18:51:42 +0000992 StringLiteralParser Literal(StringToks, NumStringToks, PP);
Reid Spencer5f016e22007-07-11 17:01:13 +0000993 if (Literal.hadError)
Sebastian Redlcd965b92009-01-18 18:53:16 +0000994 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +0000995
996 llvm::SmallVector<SourceLocation, 4> StringTokLocs;
997 for (unsigned i = 0; i != NumStringToks; ++i)
998 StringTokLocs.push_back(StringToks[i].getLocation());
Chris Lattnera7ad98f2008-02-11 00:02:17 +0000999
Chris Lattnera7ad98f2008-02-11 00:02:17 +00001000 QualType StrTy = Context.CharTy;
Anders Carlsson96b4adc2011-04-06 18:42:48 +00001001 if (Literal.AnyWide)
1002 StrTy = Context.getWCharType();
1003 else if (Literal.Pascal)
1004 StrTy = Context.UnsignedCharTy;
Douglas Gregor77a52232008-09-12 00:47:35 +00001005
1006 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
Chris Lattner7dc480f2010-06-15 18:05:34 +00001007 if (getLangOptions().CPlusPlus || getLangOptions().ConstStrings)
Douglas Gregor77a52232008-09-12 00:47:35 +00001008 StrTy.addConst();
Sebastian Redlcd965b92009-01-18 18:53:16 +00001009
Chris Lattnera7ad98f2008-02-11 00:02:17 +00001010 // Get an array type for the string, according to C99 6.4.5. This includes
1011 // the nul terminator character as well as the string length for pascal
1012 // strings.
1013 StrTy = Context.getConstantArrayType(StrTy,
Chris Lattnerdbb1ecc2009-02-26 23:01:51 +00001014 llvm::APInt(32, Literal.GetNumStringChars()+1),
Chris Lattnera7ad98f2008-02-11 00:02:17 +00001015 ArrayType::Normal, 0);
Mike Stump1eb44332009-09-09 15:08:12 +00001016
Reid Spencer5f016e22007-07-11 17:01:13 +00001017 // Pass &StringTokLocs[0], StringTokLocs.size() to factory!
Sean Hunt6cf75022010-08-30 17:47:05 +00001018 return Owned(StringLiteral::Create(Context, Literal.GetString(),
Anders Carlsson3e2193c2011-04-14 00:40:03 +00001019 Literal.AnyWide, Literal.Pascal, StrTy,
Sean Hunt6cf75022010-08-30 17:47:05 +00001020 &StringTokLocs[0],
1021 StringTokLocs.size()));
Reid Spencer5f016e22007-07-11 17:01:13 +00001022}
1023
John McCall469a1eb2011-02-02 13:00:07 +00001024enum CaptureResult {
1025 /// No capture is required.
1026 CR_NoCapture,
1027
1028 /// A capture is required.
1029 CR_Capture,
1030
John McCall6b5a61b2011-02-07 10:33:21 +00001031 /// A by-ref capture is required.
1032 CR_CaptureByRef,
1033
John McCall469a1eb2011-02-02 13:00:07 +00001034 /// An error occurred when trying to capture the given variable.
1035 CR_Error
1036};
1037
1038/// Diagnose an uncapturable value reference.
Chris Lattner639e2d32008-10-20 05:16:36 +00001039///
John McCall469a1eb2011-02-02 13:00:07 +00001040/// \param var - the variable referenced
1041/// \param DC - the context which we couldn't capture through
1042static CaptureResult
John McCall6b5a61b2011-02-07 10:33:21 +00001043diagnoseUncapturableValueReference(Sema &S, SourceLocation loc,
John McCall469a1eb2011-02-02 13:00:07 +00001044 VarDecl *var, DeclContext *DC) {
1045 switch (S.ExprEvalContexts.back().Context) {
1046 case Sema::Unevaluated:
1047 // The argument will never be evaluated, so don't complain.
1048 return CR_NoCapture;
Mike Stump1eb44332009-09-09 15:08:12 +00001049
John McCall469a1eb2011-02-02 13:00:07 +00001050 case Sema::PotentiallyEvaluated:
1051 case Sema::PotentiallyEvaluatedIfUsed:
1052 break;
Chris Lattner639e2d32008-10-20 05:16:36 +00001053
John McCall469a1eb2011-02-02 13:00:07 +00001054 case Sema::PotentiallyPotentiallyEvaluated:
1055 // FIXME: delay these!
1056 break;
Chris Lattner17f3a6d2009-04-21 22:26:47 +00001057 }
Mike Stump1eb44332009-09-09 15:08:12 +00001058
John McCall469a1eb2011-02-02 13:00:07 +00001059 // Don't diagnose about capture if we're not actually in code right
1060 // now; in general, there are more appropriate places that will
1061 // diagnose this.
1062 if (!S.CurContext->isFunctionOrMethod()) return CR_NoCapture;
1063
John McCall4f38f412011-03-22 23:15:50 +00001064 // Certain madnesses can happen with parameter declarations, which
1065 // we want to ignore.
1066 if (isa<ParmVarDecl>(var)) {
1067 // - If the parameter still belongs to the translation unit, then
1068 // we're actually just using one parameter in the declaration of
1069 // the next. This is useful in e.g. VLAs.
1070 if (isa<TranslationUnitDecl>(var->getDeclContext()))
1071 return CR_NoCapture;
1072
1073 // - This particular madness can happen in ill-formed default
1074 // arguments; claim it's okay and let downstream code handle it.
1075 if (S.CurContext == var->getDeclContext()->getParent())
1076 return CR_NoCapture;
1077 }
John McCall469a1eb2011-02-02 13:00:07 +00001078
1079 DeclarationName functionName;
1080 if (FunctionDecl *fn = dyn_cast<FunctionDecl>(var->getDeclContext()))
1081 functionName = fn->getDeclName();
1082 // FIXME: variable from enclosing block that we couldn't capture from!
1083
1084 S.Diag(loc, diag::err_reference_to_local_var_in_enclosing_function)
1085 << var->getIdentifier() << functionName;
1086 S.Diag(var->getLocation(), diag::note_local_variable_declared_here)
1087 << var->getIdentifier();
1088
1089 return CR_Error;
Mike Stump1eb44332009-09-09 15:08:12 +00001090}
1091
John McCall6b5a61b2011-02-07 10:33:21 +00001092/// There is a well-formed capture at a particular scope level;
1093/// propagate it through all the nested blocks.
1094static CaptureResult propagateCapture(Sema &S, unsigned validScopeIndex,
1095 const BlockDecl::Capture &capture) {
1096 VarDecl *var = capture.getVariable();
1097
1098 // Update all the inner blocks with the capture information.
1099 for (unsigned i = validScopeIndex + 1, e = S.FunctionScopes.size();
1100 i != e; ++i) {
1101 BlockScopeInfo *innerBlock = cast<BlockScopeInfo>(S.FunctionScopes[i]);
1102 innerBlock->Captures.push_back(
1103 BlockDecl::Capture(capture.getVariable(), capture.isByRef(),
1104 /*nested*/ true, capture.getCopyExpr()));
1105 innerBlock->CaptureMap[var] = innerBlock->Captures.size(); // +1
1106 }
1107
1108 return capture.isByRef() ? CR_CaptureByRef : CR_Capture;
1109}
1110
1111/// shouldCaptureValueReference - Determine if a reference to the
John McCall469a1eb2011-02-02 13:00:07 +00001112/// given value in the current context requires a variable capture.
1113///
1114/// This also keeps the captures set in the BlockScopeInfo records
1115/// up-to-date.
John McCall6b5a61b2011-02-07 10:33:21 +00001116static CaptureResult shouldCaptureValueReference(Sema &S, SourceLocation loc,
John McCall469a1eb2011-02-02 13:00:07 +00001117 ValueDecl *value) {
1118 // Only variables ever require capture.
1119 VarDecl *var = dyn_cast<VarDecl>(value);
John McCall76a40212011-02-09 01:13:10 +00001120 if (!var) return CR_NoCapture;
John McCall469a1eb2011-02-02 13:00:07 +00001121
1122 // Fast path: variables from the current context never require capture.
1123 DeclContext *DC = S.CurContext;
1124 if (var->getDeclContext() == DC) return CR_NoCapture;
1125
1126 // Only variables with local storage require capture.
1127 // FIXME: What about 'const' variables in C++?
1128 if (!var->hasLocalStorage()) return CR_NoCapture;
1129
1130 // Otherwise, we need to capture.
1131
1132 unsigned functionScopesIndex = S.FunctionScopes.size() - 1;
John McCall469a1eb2011-02-02 13:00:07 +00001133 do {
1134 // Only blocks (and eventually C++0x closures) can capture; other
1135 // scopes don't work.
1136 if (!isa<BlockDecl>(DC))
John McCall6b5a61b2011-02-07 10:33:21 +00001137 return diagnoseUncapturableValueReference(S, loc, var, DC);
John McCall469a1eb2011-02-02 13:00:07 +00001138
1139 BlockScopeInfo *blockScope =
1140 cast<BlockScopeInfo>(S.FunctionScopes[functionScopesIndex]);
1141 assert(blockScope->TheDecl == static_cast<BlockDecl*>(DC));
1142
John McCall6b5a61b2011-02-07 10:33:21 +00001143 // Check whether we've already captured it in this block. If so,
1144 // we're done.
1145 if (unsigned indexPlus1 = blockScope->CaptureMap[var])
1146 return propagateCapture(S, functionScopesIndex,
1147 blockScope->Captures[indexPlus1 - 1]);
John McCall469a1eb2011-02-02 13:00:07 +00001148
1149 functionScopesIndex--;
1150 DC = cast<BlockDecl>(DC)->getDeclContext();
1151 } while (var->getDeclContext() != DC);
1152
John McCall6b5a61b2011-02-07 10:33:21 +00001153 // Okay, we descended all the way to the block that defines the variable.
1154 // Actually try to capture it.
1155 QualType type = var->getType();
1156
1157 // Prohibit variably-modified types.
1158 if (type->isVariablyModifiedType()) {
1159 S.Diag(loc, diag::err_ref_vm_type);
1160 S.Diag(var->getLocation(), diag::note_declared_at);
1161 return CR_Error;
1162 }
1163
1164 // Prohibit arrays, even in __block variables, but not references to
1165 // them.
1166 if (type->isArrayType()) {
1167 S.Diag(loc, diag::err_ref_array_type);
1168 S.Diag(var->getLocation(), diag::note_declared_at);
1169 return CR_Error;
1170 }
1171
1172 S.MarkDeclarationReferenced(loc, var);
1173
1174 // The BlocksAttr indicates the variable is bound by-reference.
1175 bool byRef = var->hasAttr<BlocksAttr>();
1176
1177 // Build a copy expression.
1178 Expr *copyExpr = 0;
John McCall642a75f2011-04-28 02:15:35 +00001179 const RecordType *rtype;
1180 if (!byRef && S.getLangOptions().CPlusPlus && !type->isDependentType() &&
1181 (rtype = type->getAs<RecordType>())) {
1182
1183 // The capture logic needs the destructor, so make sure we mark it.
1184 // Usually this is unnecessary because most local variables have
1185 // their destructors marked at declaration time, but parameters are
1186 // an exception because it's technically only the call site that
1187 // actually requires the destructor.
1188 if (isa<ParmVarDecl>(var))
1189 S.FinalizeVarWithDestructor(var, rtype);
1190
John McCall6b5a61b2011-02-07 10:33:21 +00001191 // According to the blocks spec, the capture of a variable from
1192 // the stack requires a const copy constructor. This is not true
1193 // of the copy/move done to move a __block variable to the heap.
1194 type.addConst();
1195
1196 Expr *declRef = new (S.Context) DeclRefExpr(var, type, VK_LValue, loc);
1197 ExprResult result =
1198 S.PerformCopyInitialization(
1199 InitializedEntity::InitializeBlock(var->getLocation(),
1200 type, false),
1201 loc, S.Owned(declRef));
1202
1203 // Build a full-expression copy expression if initialization
1204 // succeeded and used a non-trivial constructor. Recover from
1205 // errors by pretending that the copy isn't necessary.
1206 if (!result.isInvalid() &&
1207 !cast<CXXConstructExpr>(result.get())->getConstructor()->isTrivial()) {
1208 result = S.MaybeCreateExprWithCleanups(result);
1209 copyExpr = result.take();
1210 }
1211 }
1212
1213 // We're currently at the declarer; go back to the closure.
1214 functionScopesIndex++;
1215 BlockScopeInfo *blockScope =
1216 cast<BlockScopeInfo>(S.FunctionScopes[functionScopesIndex]);
1217
1218 // Build a valid capture in this scope.
1219 blockScope->Captures.push_back(
1220 BlockDecl::Capture(var, byRef, /*nested*/ false, copyExpr));
1221 blockScope->CaptureMap[var] = blockScope->Captures.size(); // +1
1222
1223 // Propagate that to inner captures if necessary.
1224 return propagateCapture(S, functionScopesIndex,
1225 blockScope->Captures.back());
1226}
1227
1228static ExprResult BuildBlockDeclRefExpr(Sema &S, ValueDecl *vd,
1229 const DeclarationNameInfo &NameInfo,
1230 bool byRef) {
1231 assert(isa<VarDecl>(vd) && "capturing non-variable");
1232
1233 VarDecl *var = cast<VarDecl>(vd);
1234 assert(var->hasLocalStorage() && "capturing non-local");
1235 assert(byRef == var->hasAttr<BlocksAttr>() && "byref set wrong");
1236
1237 QualType exprType = var->getType().getNonReferenceType();
1238
1239 BlockDeclRefExpr *BDRE;
1240 if (!byRef) {
1241 // The variable will be bound by copy; make it const within the
1242 // closure, but record that this was done in the expression.
1243 bool constAdded = !exprType.isConstQualified();
1244 exprType.addConst();
1245
1246 BDRE = new (S.Context) BlockDeclRefExpr(var, exprType, VK_LValue,
1247 NameInfo.getLoc(), false,
1248 constAdded);
1249 } else {
1250 BDRE = new (S.Context) BlockDeclRefExpr(var, exprType, VK_LValue,
1251 NameInfo.getLoc(), true);
1252 }
1253
1254 return S.Owned(BDRE);
John McCall469a1eb2011-02-02 13:00:07 +00001255}
Chris Lattner639e2d32008-10-20 05:16:36 +00001256
John McCall60d7b3a2010-08-24 06:29:42 +00001257ExprResult
John McCallf89e55a2010-11-18 06:31:45 +00001258Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
John McCall76a40212011-02-09 01:13:10 +00001259 SourceLocation Loc,
1260 const CXXScopeSpec *SS) {
Abramo Bagnara25777432010-08-11 22:01:17 +00001261 DeclarationNameInfo NameInfo(D->getDeclName(), Loc);
John McCallf89e55a2010-11-18 06:31:45 +00001262 return BuildDeclRefExpr(D, Ty, VK, NameInfo, SS);
Abramo Bagnara25777432010-08-11 22:01:17 +00001263}
1264
John McCall76a40212011-02-09 01:13:10 +00001265/// BuildDeclRefExpr - Build an expression that references a
1266/// declaration that does not require a closure capture.
John McCall60d7b3a2010-08-24 06:29:42 +00001267ExprResult
John McCall76a40212011-02-09 01:13:10 +00001268Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
Abramo Bagnara25777432010-08-11 22:01:17 +00001269 const DeclarationNameInfo &NameInfo,
1270 const CXXScopeSpec *SS) {
Abramo Bagnara25777432010-08-11 22:01:17 +00001271 MarkDeclarationReferenced(NameInfo.getLoc(), D);
Mike Stump1eb44332009-09-09 15:08:12 +00001272
John McCall7eb0a9e2010-11-24 05:12:34 +00001273 Expr *E = DeclRefExpr::Create(Context,
Douglas Gregor40d96a62011-02-28 21:54:11 +00001274 SS? SS->getWithLocInContext(Context)
1275 : NestedNameSpecifierLoc(),
John McCall7eb0a9e2010-11-24 05:12:34 +00001276 D, NameInfo, Ty, VK);
1277
1278 // Just in case we're building an illegal pointer-to-member.
1279 if (isa<FieldDecl>(D) && cast<FieldDecl>(D)->getBitWidth())
1280 E->setObjectKind(OK_BitField);
1281
1282 return Owned(E);
Douglas Gregor1a49af92009-01-06 05:10:23 +00001283}
1284
John McCalldfa1edb2010-11-23 20:48:44 +00001285static ExprResult
1286BuildFieldReferenceExpr(Sema &S, Expr *BaseExpr, bool IsArrow,
1287 const CXXScopeSpec &SS, FieldDecl *Field,
1288 DeclAccessPair FoundDecl,
1289 const DeclarationNameInfo &MemberNameInfo);
1290
John McCall60d7b3a2010-08-24 06:29:42 +00001291ExprResult
John McCall5808ce42011-02-03 08:15:49 +00001292Sema::BuildAnonymousStructUnionMemberReference(const CXXScopeSpec &SS,
1293 SourceLocation loc,
1294 IndirectFieldDecl *indirectField,
1295 Expr *baseObjectExpr,
1296 SourceLocation opLoc) {
1297 // First, build the expression that refers to the base object.
1298
1299 bool baseObjectIsPointer = false;
1300 Qualifiers baseQuals;
1301
1302 // Case 1: the base of the indirect field is not a field.
1303 VarDecl *baseVariable = indirectField->getVarDecl();
Douglas Gregorf5848322011-02-18 02:44:58 +00001304 CXXScopeSpec EmptySS;
John McCall5808ce42011-02-03 08:15:49 +00001305 if (baseVariable) {
1306 assert(baseVariable->getType()->isRecordType());
1307
1308 // In principle we could have a member access expression that
1309 // accesses an anonymous struct/union that's a static member of
1310 // the base object's class. However, under the current standard,
1311 // static data members cannot be anonymous structs or unions.
1312 // Supporting this is as easy as building a MemberExpr here.
1313 assert(!baseObjectExpr && "anonymous struct/union is static data member?");
1314
1315 DeclarationNameInfo baseNameInfo(DeclarationName(), loc);
1316
1317 ExprResult result =
Douglas Gregorf5848322011-02-18 02:44:58 +00001318 BuildDeclarationNameExpr(EmptySS, baseNameInfo, baseVariable);
John McCall5808ce42011-02-03 08:15:49 +00001319 if (result.isInvalid()) return ExprError();
1320
1321 baseObjectExpr = result.take();
1322 baseObjectIsPointer = false;
1323 baseQuals = baseObjectExpr->getType().getQualifiers();
1324
1325 // Case 2: the base of the indirect field is a field and the user
1326 // wrote a member expression.
1327 } else if (baseObjectExpr) {
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001328 // The caller provided the base object expression. Determine
1329 // whether its a pointer and whether it adds any qualifiers to the
1330 // anonymous struct/union fields we're looking into.
John McCall5808ce42011-02-03 08:15:49 +00001331 QualType objectType = baseObjectExpr->getType();
1332
1333 if (const PointerType *ptr = objectType->getAs<PointerType>()) {
1334 baseObjectIsPointer = true;
1335 objectType = ptr->getPointeeType();
1336 } else {
1337 baseObjectIsPointer = false;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001338 }
John McCall5808ce42011-02-03 08:15:49 +00001339 baseQuals = objectType.getQualifiers();
1340
1341 // Case 3: the base of the indirect field is a field and we should
1342 // build an implicit member access.
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001343 } else {
1344 // We've found a member of an anonymous struct/union that is
1345 // inside a non-anonymous struct/union, so in a well-formed
1346 // program our base object expression is "this".
Richard Smith7a614d82011-06-11 17:19:42 +00001347 QualType ThisTy = getAndCaptureCurrentThisType();
1348 if (ThisTy.isNull()) {
John McCall5808ce42011-02-03 08:15:49 +00001349 Diag(loc, diag::err_invalid_member_use_in_static_method)
1350 << indirectField->getDeclName();
1351 return ExprError();
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001352 }
1353
John McCall5808ce42011-02-03 08:15:49 +00001354 // Our base object expression is "this".
1355 baseObjectExpr =
Richard Smith7a614d82011-06-11 17:19:42 +00001356 new (Context) CXXThisExpr(loc, ThisTy, /*isImplicit=*/ true);
John McCall5808ce42011-02-03 08:15:49 +00001357 baseObjectIsPointer = true;
Richard Smith7a614d82011-06-11 17:19:42 +00001358 baseQuals = ThisTy->castAs<PointerType>()->getPointeeType().getQualifiers();
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001359 }
1360
1361 // Build the implicit member references to the field of the
1362 // anonymous struct/union.
John McCall5808ce42011-02-03 08:15:49 +00001363 Expr *result = baseObjectExpr;
1364 IndirectFieldDecl::chain_iterator
1365 FI = indirectField->chain_begin(), FEnd = indirectField->chain_end();
John McCalldfa1edb2010-11-23 20:48:44 +00001366
John McCall5808ce42011-02-03 08:15:49 +00001367 // Build the first member access in the chain with full information.
1368 if (!baseVariable) {
1369 FieldDecl *field = cast<FieldDecl>(*FI);
John McCalldfa1edb2010-11-23 20:48:44 +00001370
John McCall5808ce42011-02-03 08:15:49 +00001371 // FIXME: use the real found-decl info!
1372 DeclAccessPair foundDecl = DeclAccessPair::make(field, field->getAccess());
John McCall0953e762009-09-24 19:53:00 +00001373
John McCall5808ce42011-02-03 08:15:49 +00001374 // Make a nameInfo that properly uses the anonymous name.
1375 DeclarationNameInfo memberNameInfo(field->getDeclName(), loc);
John McCall0953e762009-09-24 19:53:00 +00001376
John McCall5808ce42011-02-03 08:15:49 +00001377 result = BuildFieldReferenceExpr(*this, result, baseObjectIsPointer,
Douglas Gregorf5848322011-02-18 02:44:58 +00001378 EmptySS, field, foundDecl,
John McCall5808ce42011-02-03 08:15:49 +00001379 memberNameInfo).take();
1380 baseObjectIsPointer = false;
John McCall0953e762009-09-24 19:53:00 +00001381
John McCall5808ce42011-02-03 08:15:49 +00001382 // FIXME: check qualified member access
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001383 }
1384
John McCall5808ce42011-02-03 08:15:49 +00001385 // In all cases, we should now skip the first declaration in the chain.
1386 ++FI;
1387
Douglas Gregorf5848322011-02-18 02:44:58 +00001388 while (FI != FEnd) {
1389 FieldDecl *field = cast<FieldDecl>(*FI++);
John McCall5808ce42011-02-03 08:15:49 +00001390
1391 // FIXME: these are somewhat meaningless
1392 DeclarationNameInfo memberNameInfo(field->getDeclName(), loc);
1393 DeclAccessPair foundDecl = DeclAccessPair::make(field, field->getAccess());
John McCall5808ce42011-02-03 08:15:49 +00001394
1395 result = BuildFieldReferenceExpr(*this, result, /*isarrow*/ false,
Douglas Gregorf5848322011-02-18 02:44:58 +00001396 (FI == FEnd? SS : EmptySS), field,
1397 foundDecl, memberNameInfo)
John McCall5808ce42011-02-03 08:15:49 +00001398 .take();
1399 }
1400
1401 return Owned(result);
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001402}
1403
Abramo Bagnara25777432010-08-11 22:01:17 +00001404/// Decomposes the given name into a DeclarationNameInfo, its location, and
John McCall129e2df2009-11-30 22:42:35 +00001405/// possibly a list of template arguments.
1406///
1407/// If this produces template arguments, it is permitted to call
1408/// DecomposeTemplateName.
1409///
1410/// This actually loses a lot of source location information for
1411/// non-standard name kinds; we should consider preserving that in
1412/// some way.
1413static void DecomposeUnqualifiedId(Sema &SemaRef,
1414 const UnqualifiedId &Id,
1415 TemplateArgumentListInfo &Buffer,
Abramo Bagnara25777432010-08-11 22:01:17 +00001416 DeclarationNameInfo &NameInfo,
John McCall129e2df2009-11-30 22:42:35 +00001417 const TemplateArgumentListInfo *&TemplateArgs) {
1418 if (Id.getKind() == UnqualifiedId::IK_TemplateId) {
1419 Buffer.setLAngleLoc(Id.TemplateId->LAngleLoc);
1420 Buffer.setRAngleLoc(Id.TemplateId->RAngleLoc);
1421
1422 ASTTemplateArgsPtr TemplateArgsPtr(SemaRef,
1423 Id.TemplateId->getTemplateArgs(),
1424 Id.TemplateId->NumArgs);
1425 SemaRef.translateTemplateArguments(TemplateArgsPtr, Buffer);
1426 TemplateArgsPtr.release();
1427
John McCall2b5289b2010-08-23 07:28:44 +00001428 TemplateName TName = Id.TemplateId->Template.get();
Abramo Bagnara25777432010-08-11 22:01:17 +00001429 SourceLocation TNameLoc = Id.TemplateId->TemplateNameLoc;
1430 NameInfo = SemaRef.Context.getNameForTemplate(TName, TNameLoc);
John McCall129e2df2009-11-30 22:42:35 +00001431 TemplateArgs = &Buffer;
1432 } else {
Abramo Bagnara25777432010-08-11 22:01:17 +00001433 NameInfo = SemaRef.GetNameFromUnqualifiedId(Id);
John McCall129e2df2009-11-30 22:42:35 +00001434 TemplateArgs = 0;
1435 }
1436}
1437
John McCallaa81e162009-12-01 22:10:20 +00001438/// Determines if the given class is provably not derived from all of
1439/// the prospective base classes.
1440static bool IsProvablyNotDerivedFrom(Sema &SemaRef,
1441 CXXRecordDecl *Record,
1442 const llvm::SmallPtrSet<CXXRecordDecl*, 4> &Bases) {
John McCallb1b42562009-12-01 22:28:41 +00001443 if (Bases.count(Record->getCanonicalDecl()))
John McCallaa81e162009-12-01 22:10:20 +00001444 return false;
1445
Douglas Gregor952b0172010-02-11 01:04:33 +00001446 RecordDecl *RD = Record->getDefinition();
John McCallb1b42562009-12-01 22:28:41 +00001447 if (!RD) return false;
1448 Record = cast<CXXRecordDecl>(RD);
1449
John McCallaa81e162009-12-01 22:10:20 +00001450 for (CXXRecordDecl::base_class_iterator I = Record->bases_begin(),
1451 E = Record->bases_end(); I != E; ++I) {
1452 CanQualType BaseT = SemaRef.Context.getCanonicalType((*I).getType());
1453 CanQual<RecordType> BaseRT = BaseT->getAs<RecordType>();
1454 if (!BaseRT) return false;
1455
1456 CXXRecordDecl *BaseRecord = cast<CXXRecordDecl>(BaseRT->getDecl());
John McCallaa81e162009-12-01 22:10:20 +00001457 if (!IsProvablyNotDerivedFrom(SemaRef, BaseRecord, Bases))
1458 return false;
1459 }
1460
1461 return true;
1462}
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001463
John McCallaa81e162009-12-01 22:10:20 +00001464enum IMAKind {
1465 /// The reference is definitely not an instance member access.
1466 IMA_Static,
1467
1468 /// The reference may be an implicit instance member access.
1469 IMA_Mixed,
1470
1471 /// The reference may be to an instance member, but it is invalid if
1472 /// so, because the context is not an instance method.
1473 IMA_Mixed_StaticContext,
1474
1475 /// The reference may be to an instance member, but it is invalid if
1476 /// so, because the context is from an unrelated class.
1477 IMA_Mixed_Unrelated,
1478
1479 /// The reference is definitely an implicit instance member access.
1480 IMA_Instance,
1481
1482 /// The reference may be to an unresolved using declaration.
1483 IMA_Unresolved,
1484
1485 /// The reference may be to an unresolved using declaration and the
1486 /// context is not an instance method.
1487 IMA_Unresolved_StaticContext,
1488
John McCallaa81e162009-12-01 22:10:20 +00001489 /// All possible referrents are instance members and the current
1490 /// context is not an instance method.
1491 IMA_Error_StaticContext,
1492
1493 /// All possible referrents are instance members of an unrelated
1494 /// class.
1495 IMA_Error_Unrelated
1496};
1497
1498/// The given lookup names class member(s) and is not being used for
1499/// an address-of-member expression. Classify the type of access
1500/// according to whether it's possible that this reference names an
1501/// instance member. This is best-effort; it is okay to
1502/// conservatively answer "yes", in which case some errors will simply
1503/// not be caught until template-instantiation.
1504static IMAKind ClassifyImplicitMemberAccess(Sema &SemaRef,
Richard Smith7a614d82011-06-11 17:19:42 +00001505 Scope *CurScope,
John McCallaa81e162009-12-01 22:10:20 +00001506 const LookupResult &R) {
John McCall3b4294e2009-12-16 12:17:52 +00001507 assert(!R.empty() && (*R.begin())->isCXXClassMember());
John McCallaa81e162009-12-01 22:10:20 +00001508
John McCallea1471e2010-05-20 01:18:31 +00001509 DeclContext *DC = SemaRef.getFunctionLevelDeclContext();
Richard Smith7a614d82011-06-11 17:19:42 +00001510
John McCallaa81e162009-12-01 22:10:20 +00001511 bool isStaticContext =
John McCallea1471e2010-05-20 01:18:31 +00001512 (!isa<CXXMethodDecl>(DC) ||
1513 cast<CXXMethodDecl>(DC)->isStatic());
John McCallaa81e162009-12-01 22:10:20 +00001514
Richard Smith7a614d82011-06-11 17:19:42 +00001515 // C++0x [expr.prim]p4:
1516 // Otherwise, if a member-declarator declares a non-static data member
1517 // of a class X, the expression this is a prvalue of type "pointer to X"
1518 // within the optional brace-or-equal-initializer.
1519 if (CurScope->getFlags() & Scope::ThisScope)
1520 isStaticContext = false;
1521
John McCallaa81e162009-12-01 22:10:20 +00001522 if (R.isUnresolvableResult())
1523 return isStaticContext ? IMA_Unresolved_StaticContext : IMA_Unresolved;
1524
1525 // Collect all the declaring classes of instance members we find.
1526 bool hasNonInstance = false;
Sebastian Redlf9780002010-11-26 16:28:07 +00001527 bool hasField = false;
John McCallaa81e162009-12-01 22:10:20 +00001528 llvm::SmallPtrSet<CXXRecordDecl*, 4> Classes;
1529 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
John McCall161755a2010-04-06 21:38:20 +00001530 NamedDecl *D = *I;
Francois Pichet87c2e122010-11-21 06:08:52 +00001531
John McCall161755a2010-04-06 21:38:20 +00001532 if (D->isCXXInstanceMember()) {
Sebastian Redlf9780002010-11-26 16:28:07 +00001533 if (dyn_cast<FieldDecl>(D))
1534 hasField = true;
1535
John McCallaa81e162009-12-01 22:10:20 +00001536 CXXRecordDecl *R = cast<CXXRecordDecl>(D->getDeclContext());
John McCallaa81e162009-12-01 22:10:20 +00001537 Classes.insert(R->getCanonicalDecl());
1538 }
1539 else
1540 hasNonInstance = true;
1541 }
1542
1543 // If we didn't find any instance members, it can't be an implicit
1544 // member reference.
1545 if (Classes.empty())
1546 return IMA_Static;
1547
1548 // If the current context is not an instance method, it can't be
1549 // an implicit member reference.
Sebastian Redlf9780002010-11-26 16:28:07 +00001550 if (isStaticContext) {
1551 if (hasNonInstance)
1552 return IMA_Mixed_StaticContext;
1553
1554 if (SemaRef.getLangOptions().CPlusPlus0x && hasField) {
1555 // C++0x [expr.prim.general]p10:
1556 // An id-expression that denotes a non-static data member or non-static
1557 // member function of a class can only be used:
1558 // (...)
John McCallf85e1932011-06-15 23:02:42 +00001559 // - if that id-expression denotes a non-static data member and it
1560 // appears in an unevaluated operand.
1561 const Sema::ExpressionEvaluationContextRecord& record
1562 = SemaRef.ExprEvalContexts.back();
1563 bool isUnevaluatedExpression = (record.Context == Sema::Unevaluated);
Sebastian Redlf9780002010-11-26 16:28:07 +00001564 if (isUnevaluatedExpression)
1565 return IMA_Mixed_StaticContext;
1566 }
1567
1568 return IMA_Error_StaticContext;
1569 }
John McCallaa81e162009-12-01 22:10:20 +00001570
Richard Smith7a614d82011-06-11 17:19:42 +00001571 CXXRecordDecl *contextClass;
1572 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC))
1573 contextClass = MD->getParent()->getCanonicalDecl();
1574 else
1575 contextClass = cast<CXXRecordDecl>(DC);
Argyrios Kyrtzidis0d8dc462011-04-14 00:46:47 +00001576
1577 // [class.mfct.non-static]p3:
1578 // ...is used in the body of a non-static member function of class X,
1579 // if name lookup (3.4.1) resolves the name in the id-expression to a
1580 // non-static non-type member of some class C [...]
1581 // ...if C is not X or a base class of X, the class member access expression
1582 // is ill-formed.
1583 if (R.getNamingClass() &&
1584 contextClass != R.getNamingClass()->getCanonicalDecl() &&
1585 contextClass->isProvablyNotDerivedFrom(R.getNamingClass()))
1586 return (hasNonInstance ? IMA_Mixed_Unrelated : IMA_Error_Unrelated);
1587
John McCallaa81e162009-12-01 22:10:20 +00001588 // If we can prove that the current context is unrelated to all the
1589 // declaring classes, it can't be an implicit member reference (in
1590 // which case it's an error if any of those members are selected).
Argyrios Kyrtzidis0d8dc462011-04-14 00:46:47 +00001591 if (IsProvablyNotDerivedFrom(SemaRef, contextClass, Classes))
John McCallaa81e162009-12-01 22:10:20 +00001592 return (hasNonInstance ? IMA_Mixed_Unrelated : IMA_Error_Unrelated);
1593
1594 return (hasNonInstance ? IMA_Mixed : IMA_Instance);
1595}
1596
1597/// Diagnose a reference to a field with no object available.
1598static void DiagnoseInstanceReference(Sema &SemaRef,
1599 const CXXScopeSpec &SS,
John McCall5808ce42011-02-03 08:15:49 +00001600 NamedDecl *rep,
1601 const DeclarationNameInfo &nameInfo) {
1602 SourceLocation Loc = nameInfo.getLoc();
John McCallaa81e162009-12-01 22:10:20 +00001603 SourceRange Range(Loc);
1604 if (SS.isSet()) Range.setBegin(SS.getRange().getBegin());
1605
John McCall5808ce42011-02-03 08:15:49 +00001606 if (isa<FieldDecl>(rep) || isa<IndirectFieldDecl>(rep)) {
John McCallaa81e162009-12-01 22:10:20 +00001607 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(SemaRef.CurContext)) {
1608 if (MD->isStatic()) {
1609 // "invalid use of member 'x' in static member function"
1610 SemaRef.Diag(Loc, diag::err_invalid_member_use_in_static_method)
John McCall5808ce42011-02-03 08:15:49 +00001611 << Range << nameInfo.getName();
John McCallaa81e162009-12-01 22:10:20 +00001612 return;
1613 }
1614 }
1615
1616 SemaRef.Diag(Loc, diag::err_invalid_non_static_member_use)
John McCall5808ce42011-02-03 08:15:49 +00001617 << nameInfo.getName() << Range;
John McCallaa81e162009-12-01 22:10:20 +00001618 return;
1619 }
1620
1621 SemaRef.Diag(Loc, diag::err_member_call_without_object) << Range;
John McCall129e2df2009-11-30 22:42:35 +00001622}
1623
John McCall578b69b2009-12-16 08:11:27 +00001624/// Diagnose an empty lookup.
1625///
1626/// \return false if new lookup candidates were found
Nick Lewycky03d98c52010-07-06 19:51:49 +00001627bool Sema::DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R,
1628 CorrectTypoContext CTC) {
John McCall578b69b2009-12-16 08:11:27 +00001629 DeclarationName Name = R.getLookupName();
1630
John McCall578b69b2009-12-16 08:11:27 +00001631 unsigned diagnostic = diag::err_undeclared_var_use;
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001632 unsigned diagnostic_suggest = diag::err_undeclared_var_use_suggest;
John McCall578b69b2009-12-16 08:11:27 +00001633 if (Name.getNameKind() == DeclarationName::CXXOperatorName ||
1634 Name.getNameKind() == DeclarationName::CXXLiteralOperatorName ||
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001635 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
John McCall578b69b2009-12-16 08:11:27 +00001636 diagnostic = diag::err_undeclared_use;
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001637 diagnostic_suggest = diag::err_undeclared_use_suggest;
1638 }
John McCall578b69b2009-12-16 08:11:27 +00001639
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001640 // If the original lookup was an unqualified lookup, fake an
1641 // unqualified lookup. This is useful when (for example) the
1642 // original lookup would not have found something because it was a
1643 // dependent name.
Nick Lewycky03d98c52010-07-06 19:51:49 +00001644 for (DeclContext *DC = SS.isEmpty() ? CurContext : 0;
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001645 DC; DC = DC->getParent()) {
John McCall578b69b2009-12-16 08:11:27 +00001646 if (isa<CXXRecordDecl>(DC)) {
1647 LookupQualifiedName(R, DC);
1648
1649 if (!R.empty()) {
1650 // Don't give errors about ambiguities in this lookup.
1651 R.suppressDiagnostics();
1652
1653 CXXMethodDecl *CurMethod = dyn_cast<CXXMethodDecl>(CurContext);
1654 bool isInstance = CurMethod &&
1655 CurMethod->isInstance() &&
1656 DC == CurMethod->getParent();
1657
1658 // Give a code modification hint to insert 'this->'.
1659 // TODO: fixit for inserting 'Base<T>::' in the other cases.
1660 // Actually quite difficult!
Nick Lewycky03d98c52010-07-06 19:51:49 +00001661 if (isInstance) {
Nick Lewycky03d98c52010-07-06 19:51:49 +00001662 UnresolvedLookupExpr *ULE = cast<UnresolvedLookupExpr>(
1663 CallsUndergoingInstantiation.back()->getCallee());
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001664 CXXMethodDecl *DepMethod = cast_or_null<CXXMethodDecl>(
Nick Lewycky03d98c52010-07-06 19:51:49 +00001665 CurMethod->getInstantiatedFromMemberFunction());
Eli Friedmana7e68452010-08-22 01:00:03 +00001666 if (DepMethod) {
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001667 Diag(R.getNameLoc(), diagnostic) << Name
1668 << FixItHint::CreateInsertion(R.getNameLoc(), "this->");
1669 QualType DepThisType = DepMethod->getThisType(Context);
1670 CXXThisExpr *DepThis = new (Context) CXXThisExpr(
1671 R.getNameLoc(), DepThisType, false);
1672 TemplateArgumentListInfo TList;
1673 if (ULE->hasExplicitTemplateArgs())
1674 ULE->copyTemplateArgumentsInto(TList);
Douglas Gregor7c3179c2011-02-28 18:50:33 +00001675
Douglas Gregor7c3179c2011-02-28 18:50:33 +00001676 CXXScopeSpec SS;
Douglas Gregor4c9be892011-02-28 20:01:57 +00001677 SS.Adopt(ULE->getQualifierLoc());
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001678 CXXDependentScopeMemberExpr *DepExpr =
1679 CXXDependentScopeMemberExpr::Create(
1680 Context, DepThis, DepThisType, true, SourceLocation(),
Douglas Gregor7c3179c2011-02-28 18:50:33 +00001681 SS.getWithLocInContext(Context), NULL,
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001682 R.getLookupNameInfo(), &TList);
1683 CallsUndergoingInstantiation.back()->setCallee(DepExpr);
Eli Friedmana7e68452010-08-22 01:00:03 +00001684 } else {
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001685 // FIXME: we should be able to handle this case too. It is correct
1686 // to add this-> here. This is a workaround for PR7947.
1687 Diag(R.getNameLoc(), diagnostic) << Name;
Eli Friedmana7e68452010-08-22 01:00:03 +00001688 }
Nick Lewycky03d98c52010-07-06 19:51:49 +00001689 } else {
John McCall578b69b2009-12-16 08:11:27 +00001690 Diag(R.getNameLoc(), diagnostic) << Name;
Nick Lewycky03d98c52010-07-06 19:51:49 +00001691 }
John McCall578b69b2009-12-16 08:11:27 +00001692
1693 // Do we really want to note all of these?
1694 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
1695 Diag((*I)->getLocation(), diag::note_dependent_var_use);
1696
1697 // Tell the callee to try to recover.
1698 return false;
1699 }
Douglas Gregore26f0432010-08-09 22:38:14 +00001700
1701 R.clear();
John McCall578b69b2009-12-16 08:11:27 +00001702 }
1703 }
1704
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001705 // We didn't find anything, so try to correct for a typo.
Douglas Gregoraaf87162010-04-14 20:04:41 +00001706 DeclarationName Corrected;
Daniel Dunbardc32cdf2010-06-02 15:46:52 +00001707 if (S && (Corrected = CorrectTypo(R, S, &SS, 0, false, CTC))) {
Douglas Gregoraaf87162010-04-14 20:04:41 +00001708 if (!R.empty()) {
1709 if (isa<ValueDecl>(*R.begin()) || isa<FunctionTemplateDecl>(*R.begin())) {
1710 if (SS.isEmpty())
1711 Diag(R.getNameLoc(), diagnostic_suggest) << Name << R.getLookupName()
1712 << FixItHint::CreateReplacement(R.getNameLoc(),
1713 R.getLookupName().getAsString());
1714 else
1715 Diag(R.getNameLoc(), diag::err_no_member_suggest)
1716 << Name << computeDeclContext(SS, false) << R.getLookupName()
1717 << SS.getRange()
1718 << FixItHint::CreateReplacement(R.getNameLoc(),
1719 R.getLookupName().getAsString());
1720 if (NamedDecl *ND = R.getAsSingle<NamedDecl>())
1721 Diag(ND->getLocation(), diag::note_previous_decl)
1722 << ND->getDeclName();
1723
1724 // Tell the callee to try to recover.
1725 return false;
1726 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00001727
Douglas Gregoraaf87162010-04-14 20:04:41 +00001728 if (isa<TypeDecl>(*R.begin()) || isa<ObjCInterfaceDecl>(*R.begin())) {
1729 // FIXME: If we ended up with a typo for a type name or
1730 // Objective-C class name, we're in trouble because the parser
1731 // is in the wrong place to recover. Suggest the typo
1732 // correction, but don't make it a fix-it since we're not going
1733 // to recover well anyway.
1734 if (SS.isEmpty())
1735 Diag(R.getNameLoc(), diagnostic_suggest) << Name << R.getLookupName();
1736 else
1737 Diag(R.getNameLoc(), diag::err_no_member_suggest)
1738 << Name << computeDeclContext(SS, false) << R.getLookupName()
1739 << SS.getRange();
1740
1741 // Don't try to recover; it won't work.
1742 return true;
1743 }
1744 } else {
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00001745 // FIXME: We found a keyword. Suggest it, but don't provide a fix-it
Douglas Gregoraaf87162010-04-14 20:04:41 +00001746 // because we aren't able to recover.
Douglas Gregord203a162010-01-01 00:15:04 +00001747 if (SS.isEmpty())
Douglas Gregoraaf87162010-04-14 20:04:41 +00001748 Diag(R.getNameLoc(), diagnostic_suggest) << Name << Corrected;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001749 else
Douglas Gregord203a162010-01-01 00:15:04 +00001750 Diag(R.getNameLoc(), diag::err_no_member_suggest)
Douglas Gregoraaf87162010-04-14 20:04:41 +00001751 << Name << computeDeclContext(SS, false) << Corrected
1752 << SS.getRange();
Douglas Gregord203a162010-01-01 00:15:04 +00001753 return true;
1754 }
Douglas Gregord203a162010-01-01 00:15:04 +00001755 R.clear();
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001756 }
1757
1758 // Emit a special diagnostic for failed member lookups.
1759 // FIXME: computing the declaration context might fail here (?)
1760 if (!SS.isEmpty()) {
1761 Diag(R.getNameLoc(), diag::err_no_member)
1762 << Name << computeDeclContext(SS, false)
1763 << SS.getRange();
1764 return true;
1765 }
1766
John McCall578b69b2009-12-16 08:11:27 +00001767 // Give up, we can't recover.
1768 Diag(R.getNameLoc(), diagnostic) << Name;
1769 return true;
1770}
1771
Douglas Gregorca45da02010-11-02 20:36:02 +00001772ObjCPropertyDecl *Sema::canSynthesizeProvisionalIvar(IdentifierInfo *II) {
1773 ObjCMethodDecl *CurMeth = getCurMethodDecl();
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001774 ObjCInterfaceDecl *IDecl = CurMeth->getClassInterface();
1775 if (!IDecl)
1776 return 0;
1777 ObjCImplementationDecl *ClassImpDecl = IDecl->getImplementation();
1778 if (!ClassImpDecl)
1779 return 0;
Douglas Gregorca45da02010-11-02 20:36:02 +00001780 ObjCPropertyDecl *property = LookupPropertyDecl(IDecl, II);
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001781 if (!property)
1782 return 0;
1783 if (ObjCPropertyImplDecl *PIDecl = ClassImpDecl->FindPropertyImplDecl(II))
Douglas Gregorca45da02010-11-02 20:36:02 +00001784 if (PIDecl->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic ||
1785 PIDecl->getPropertyIvarDecl())
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001786 return 0;
1787 return property;
1788}
1789
Douglas Gregorca45da02010-11-02 20:36:02 +00001790bool Sema::canSynthesizeProvisionalIvar(ObjCPropertyDecl *Property) {
1791 ObjCMethodDecl *CurMeth = getCurMethodDecl();
1792 ObjCInterfaceDecl *IDecl = CurMeth->getClassInterface();
1793 if (!IDecl)
1794 return false;
1795 ObjCImplementationDecl *ClassImpDecl = IDecl->getImplementation();
1796 if (!ClassImpDecl)
1797 return false;
1798 if (ObjCPropertyImplDecl *PIDecl
1799 = ClassImpDecl->FindPropertyImplDecl(Property->getIdentifier()))
1800 if (PIDecl->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic ||
1801 PIDecl->getPropertyIvarDecl())
1802 return false;
1803
1804 return true;
1805}
1806
Douglas Gregor312eadb2011-04-24 05:37:28 +00001807ObjCIvarDecl *Sema::SynthesizeProvisionalIvar(LookupResult &Lookup,
1808 IdentifierInfo *II,
1809 SourceLocation NameLoc) {
1810 ObjCMethodDecl *CurMeth = getCurMethodDecl();
Fariborz Jahanian73f666f2010-07-30 16:59:05 +00001811 bool LookForIvars;
1812 if (Lookup.empty())
1813 LookForIvars = true;
1814 else if (CurMeth->isClassMethod())
1815 LookForIvars = false;
1816 else
1817 LookForIvars = (Lookup.isSingleResult() &&
Fariborz Jahaniand0fbadd2011-01-26 00:57:01 +00001818 Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod() &&
1819 (Lookup.getAsSingle<VarDecl>() != 0));
Fariborz Jahanian73f666f2010-07-30 16:59:05 +00001820 if (!LookForIvars)
1821 return 0;
1822
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001823 ObjCInterfaceDecl *IDecl = CurMeth->getClassInterface();
1824 if (!IDecl)
1825 return 0;
1826 ObjCImplementationDecl *ClassImpDecl = IDecl->getImplementation();
Fariborz Jahanian84ef4b22010-07-19 16:14:33 +00001827 if (!ClassImpDecl)
1828 return 0;
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001829 bool DynamicImplSeen = false;
Douglas Gregor312eadb2011-04-24 05:37:28 +00001830 ObjCPropertyDecl *property = LookupPropertyDecl(IDecl, II);
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001831 if (!property)
1832 return 0;
Fariborz Jahanian43e1b462010-10-19 19:08:23 +00001833 if (ObjCPropertyImplDecl *PIDecl = ClassImpDecl->FindPropertyImplDecl(II)) {
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001834 DynamicImplSeen =
1835 (PIDecl->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic);
Fariborz Jahanian43e1b462010-10-19 19:08:23 +00001836 // property implementation has a designated ivar. No need to assume a new
1837 // one.
1838 if (!DynamicImplSeen && PIDecl->getPropertyIvarDecl())
1839 return 0;
1840 }
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001841 if (!DynamicImplSeen) {
Douglas Gregor312eadb2011-04-24 05:37:28 +00001842 QualType PropType = Context.getCanonicalType(property->getType());
1843 ObjCIvarDecl *Ivar = ObjCIvarDecl::Create(Context, ClassImpDecl,
Abramo Bagnaraff676cb2011-03-08 08:55:46 +00001844 NameLoc, NameLoc,
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001845 II, PropType, /*Dinfo=*/0,
Fariborz Jahanian75049662010-12-15 23:29:04 +00001846 ObjCIvarDecl::Private,
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001847 (Expr *)0, true);
1848 ClassImpDecl->addDecl(Ivar);
1849 IDecl->makeDeclVisibleInContext(Ivar, false);
1850 property->setPropertyIvarDecl(Ivar);
1851 return Ivar;
1852 }
1853 return 0;
1854}
1855
John McCall60d7b3a2010-08-24 06:29:42 +00001856ExprResult Sema::ActOnIdExpression(Scope *S,
John McCallfb97e752010-08-24 22:52:39 +00001857 CXXScopeSpec &SS,
1858 UnqualifiedId &Id,
1859 bool HasTrailingLParen,
1860 bool isAddressOfOperand) {
John McCallf7a1a742009-11-24 19:00:30 +00001861 assert(!(isAddressOfOperand && HasTrailingLParen) &&
1862 "cannot be direct & operand and have a trailing lparen");
1863
1864 if (SS.isInvalid())
Douglas Gregor4c921ae2009-01-30 01:04:22 +00001865 return ExprError();
Douglas Gregor5953d8b2009-03-19 17:26:29 +00001866
John McCall129e2df2009-11-30 22:42:35 +00001867 TemplateArgumentListInfo TemplateArgsBuffer;
John McCallf7a1a742009-11-24 19:00:30 +00001868
1869 // Decompose the UnqualifiedId into the following data.
Abramo Bagnara25777432010-08-11 22:01:17 +00001870 DeclarationNameInfo NameInfo;
John McCallf7a1a742009-11-24 19:00:30 +00001871 const TemplateArgumentListInfo *TemplateArgs;
Abramo Bagnara25777432010-08-11 22:01:17 +00001872 DecomposeUnqualifiedId(*this, Id, TemplateArgsBuffer, NameInfo, TemplateArgs);
Douglas Gregor5953d8b2009-03-19 17:26:29 +00001873
Abramo Bagnara25777432010-08-11 22:01:17 +00001874 DeclarationName Name = NameInfo.getName();
Douglas Gregor10c42622008-11-18 15:03:34 +00001875 IdentifierInfo *II = Name.getAsIdentifierInfo();
Abramo Bagnara25777432010-08-11 22:01:17 +00001876 SourceLocation NameLoc = NameInfo.getLoc();
John McCallba135432009-11-21 08:51:07 +00001877
John McCallf7a1a742009-11-24 19:00:30 +00001878 // C++ [temp.dep.expr]p3:
1879 // An id-expression is type-dependent if it contains:
Douglas Gregor48026d22010-01-11 18:40:55 +00001880 // -- an identifier that was declared with a dependent type,
1881 // (note: handled after lookup)
1882 // -- a template-id that is dependent,
1883 // (note: handled in BuildTemplateIdExpr)
1884 // -- a conversion-function-id that specifies a dependent type,
John McCallf7a1a742009-11-24 19:00:30 +00001885 // -- a nested-name-specifier that contains a class-name that
1886 // names a dependent type.
1887 // Determine whether this is a member of an unknown specialization;
1888 // we need to handle these differently.
Eli Friedman647c8b32010-08-06 23:41:47 +00001889 bool DependentID = false;
1890 if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName &&
1891 Name.getCXXNameType()->isDependentType()) {
1892 DependentID = true;
1893 } else if (SS.isSet()) {
Chris Lattner337e5502011-02-18 01:27:55 +00001894 if (DeclContext *DC = computeDeclContext(SS, false)) {
Eli Friedman647c8b32010-08-06 23:41:47 +00001895 if (RequireCompleteDeclContext(SS, DC))
1896 return ExprError();
Eli Friedman647c8b32010-08-06 23:41:47 +00001897 } else {
1898 DependentID = true;
1899 }
1900 }
1901
Chris Lattner337e5502011-02-18 01:27:55 +00001902 if (DependentID)
Abramo Bagnara25777432010-08-11 22:01:17 +00001903 return ActOnDependentIdExpression(SS, NameInfo, isAddressOfOperand,
John McCallf7a1a742009-11-24 19:00:30 +00001904 TemplateArgs);
Chris Lattner337e5502011-02-18 01:27:55 +00001905
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001906 bool IvarLookupFollowUp = false;
John McCallf7a1a742009-11-24 19:00:30 +00001907 // Perform the required lookup.
Abramo Bagnara25777432010-08-11 22:01:17 +00001908 LookupResult R(*this, NameInfo, LookupOrdinaryName);
John McCallf7a1a742009-11-24 19:00:30 +00001909 if (TemplateArgs) {
Douglas Gregord2235f62010-05-20 20:58:56 +00001910 // Lookup the template name again to correctly establish the context in
1911 // which it was found. This is really unfortunate as we already did the
1912 // lookup to determine that it was a template name in the first place. If
1913 // this becomes a performance hit, we can work harder to preserve those
1914 // results until we get here but it's likely not worth it.
Douglas Gregor1fd6d442010-05-21 23:18:07 +00001915 bool MemberOfUnknownSpecialization;
1916 LookupTemplateName(R, S, SS, QualType(), /*EnteringContext=*/false,
1917 MemberOfUnknownSpecialization);
Douglas Gregor2f9f89c2011-02-04 13:35:07 +00001918
1919 if (MemberOfUnknownSpecialization ||
1920 (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation))
1921 return ActOnDependentIdExpression(SS, NameInfo, isAddressOfOperand,
1922 TemplateArgs);
John McCallf7a1a742009-11-24 19:00:30 +00001923 } else {
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001924 IvarLookupFollowUp = (!SS.isSet() && II && getCurMethodDecl());
Fariborz Jahanian48c2d562010-01-12 23:58:59 +00001925 LookupParsedName(R, S, &SS, !IvarLookupFollowUp);
Mike Stump1eb44332009-09-09 15:08:12 +00001926
Douglas Gregor2f9f89c2011-02-04 13:35:07 +00001927 // If the result might be in a dependent base class, this is a dependent
1928 // id-expression.
1929 if (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation)
1930 return ActOnDependentIdExpression(SS, NameInfo, isAddressOfOperand,
1931 TemplateArgs);
1932
John McCallf7a1a742009-11-24 19:00:30 +00001933 // If this reference is in an Objective-C method, then we need to do
1934 // some special Objective-C lookup, too.
Fariborz Jahanian48c2d562010-01-12 23:58:59 +00001935 if (IvarLookupFollowUp) {
John McCall60d7b3a2010-08-24 06:29:42 +00001936 ExprResult E(LookupInObjCMethod(R, S, II, true));
John McCallf7a1a742009-11-24 19:00:30 +00001937 if (E.isInvalid())
1938 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00001939
Chris Lattner337e5502011-02-18 01:27:55 +00001940 if (Expr *Ex = E.takeAs<Expr>())
1941 return Owned(Ex);
1942
1943 // Synthesize ivars lazily.
Fariborz Jahaniane776f882011-01-03 18:08:02 +00001944 if (getLangOptions().ObjCDefaultSynthProperties &&
1945 getLangOptions().ObjCNonFragileABI2) {
Douglas Gregor312eadb2011-04-24 05:37:28 +00001946 if (SynthesizeProvisionalIvar(R, II, NameLoc)) {
Fariborz Jahaniande267602010-11-17 19:41:23 +00001947 if (const ObjCPropertyDecl *Property =
1948 canSynthesizeProvisionalIvar(II)) {
1949 Diag(NameLoc, diag::warn_synthesized_ivar_access) << II;
1950 Diag(Property->getLocation(), diag::note_property_declare);
1951 }
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001952 return ActOnIdExpression(S, SS, Id, HasTrailingLParen,
1953 isAddressOfOperand);
Fariborz Jahaniande267602010-11-17 19:41:23 +00001954 }
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001955 }
Fariborz Jahanianf759b4d2010-08-13 18:09:39 +00001956 // for further use, this must be set to false if in class method.
1957 IvarLookupFollowUp = getCurMethodDecl()->isInstanceMethod();
Steve Naroffe3e9add2008-06-02 23:03:37 +00001958 }
Chris Lattner8a934232008-03-31 00:36:02 +00001959 }
Douglas Gregorc71e28c2009-02-16 19:28:42 +00001960
John McCallf7a1a742009-11-24 19:00:30 +00001961 if (R.isAmbiguous())
1962 return ExprError();
1963
Douglas Gregor48f3bb92009-02-18 21:56:37 +00001964 // Determine whether this name might be a candidate for
1965 // argument-dependent lookup.
John McCallf7a1a742009-11-24 19:00:30 +00001966 bool ADL = UseArgumentDependentLookup(SS, R, HasTrailingLParen);
Douglas Gregor48f3bb92009-02-18 21:56:37 +00001967
John McCallf7a1a742009-11-24 19:00:30 +00001968 if (R.empty() && !ADL) {
Reid Spencer5f016e22007-07-11 17:01:13 +00001969 // Otherwise, this could be an implicitly declared function reference (legal
John McCallf7a1a742009-11-24 19:00:30 +00001970 // in C90, extension in C99, forbidden in C++).
1971 if (HasTrailingLParen && II && !getLangOptions().CPlusPlus) {
1972 NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *II, S);
1973 if (D) R.addDecl(D);
1974 }
1975
1976 // If this name wasn't predeclared and if this is not a function
1977 // call, diagnose the problem.
1978 if (R.empty()) {
Douglas Gregor91f7ac72010-05-18 16:14:23 +00001979 if (DiagnoseEmptyLookup(S, SS, R, CTC_Unknown))
John McCall578b69b2009-12-16 08:11:27 +00001980 return ExprError();
1981
1982 assert(!R.empty() &&
1983 "DiagnoseEmptyLookup returned false but added no results");
Douglas Gregorf06cdae2010-01-03 18:01:57 +00001984
1985 // If we found an Objective-C instance variable, let
1986 // LookupInObjCMethod build the appropriate expression to
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001987 // reference the ivar.
Douglas Gregorf06cdae2010-01-03 18:01:57 +00001988 if (ObjCIvarDecl *Ivar = R.getAsSingle<ObjCIvarDecl>()) {
1989 R.clear();
John McCall60d7b3a2010-08-24 06:29:42 +00001990 ExprResult E(LookupInObjCMethod(R, S, Ivar->getIdentifier()));
Douglas Gregorf06cdae2010-01-03 18:01:57 +00001991 assert(E.isInvalid() || E.get());
1992 return move(E);
1993 }
Reid Spencer5f016e22007-07-11 17:01:13 +00001994 }
1995 }
Mike Stump1eb44332009-09-09 15:08:12 +00001996
John McCallf7a1a742009-11-24 19:00:30 +00001997 // This is guaranteed from this point on.
1998 assert(!R.empty() || ADL);
1999
John McCallaa81e162009-12-01 22:10:20 +00002000 // Check whether this might be a C++ implicit instance member access.
John McCallfb97e752010-08-24 22:52:39 +00002001 // C++ [class.mfct.non-static]p3:
2002 // When an id-expression that is not part of a class member access
2003 // syntax and not used to form a pointer to member is used in the
2004 // body of a non-static member function of class X, if name lookup
2005 // resolves the name in the id-expression to a non-static non-type
2006 // member of some class C, the id-expression is transformed into a
2007 // class member access expression using (*this) as the
2008 // postfix-expression to the left of the . operator.
John McCall9c72c602010-08-27 09:08:28 +00002009 //
2010 // But we don't actually need to do this for '&' operands if R
2011 // resolved to a function or overloaded function set, because the
2012 // expression is ill-formed if it actually works out to be a
2013 // non-static member function:
2014 //
2015 // C++ [expr.ref]p4:
2016 // Otherwise, if E1.E2 refers to a non-static member function. . .
2017 // [t]he expression can be used only as the left-hand operand of a
2018 // member function call.
2019 //
2020 // There are other safeguards against such uses, but it's important
2021 // to get this right here so that we don't end up making a
2022 // spuriously dependent expression if we're inside a dependent
2023 // instance method.
John McCall3b4294e2009-12-16 12:17:52 +00002024 if (!R.empty() && (*R.begin())->isCXXClassMember()) {
John McCall9c72c602010-08-27 09:08:28 +00002025 bool MightBeImplicitMember;
2026 if (!isAddressOfOperand)
2027 MightBeImplicitMember = true;
2028 else if (!SS.isEmpty())
2029 MightBeImplicitMember = false;
2030 else if (R.isOverloadedResult())
2031 MightBeImplicitMember = false;
Douglas Gregore2248be2010-08-30 16:00:47 +00002032 else if (R.isUnresolvableResult())
2033 MightBeImplicitMember = true;
John McCall9c72c602010-08-27 09:08:28 +00002034 else
Francois Pichet87c2e122010-11-21 06:08:52 +00002035 MightBeImplicitMember = isa<FieldDecl>(R.getFoundDecl()) ||
2036 isa<IndirectFieldDecl>(R.getFoundDecl());
John McCall9c72c602010-08-27 09:08:28 +00002037
2038 if (MightBeImplicitMember)
John McCall3b4294e2009-12-16 12:17:52 +00002039 return BuildPossibleImplicitMemberExpr(SS, R, TemplateArgs);
John McCall5b3f9132009-11-22 01:44:31 +00002040 }
2041
John McCallf7a1a742009-11-24 19:00:30 +00002042 if (TemplateArgs)
2043 return BuildTemplateIdExpr(SS, R, ADL, *TemplateArgs);
John McCall5b3f9132009-11-22 01:44:31 +00002044
John McCallf7a1a742009-11-24 19:00:30 +00002045 return BuildDeclarationNameExpr(SS, R, ADL);
2046}
2047
John McCall3b4294e2009-12-16 12:17:52 +00002048/// Builds an expression which might be an implicit member expression.
John McCall60d7b3a2010-08-24 06:29:42 +00002049ExprResult
John McCall3b4294e2009-12-16 12:17:52 +00002050Sema::BuildPossibleImplicitMemberExpr(const CXXScopeSpec &SS,
2051 LookupResult &R,
2052 const TemplateArgumentListInfo *TemplateArgs) {
Richard Smith7a614d82011-06-11 17:19:42 +00002053 switch (ClassifyImplicitMemberAccess(*this, CurScope, R)) {
John McCall3b4294e2009-12-16 12:17:52 +00002054 case IMA_Instance:
2055 return BuildImplicitMemberExpr(SS, R, TemplateArgs, true);
2056
John McCall3b4294e2009-12-16 12:17:52 +00002057 case IMA_Mixed:
2058 case IMA_Mixed_Unrelated:
2059 case IMA_Unresolved:
2060 return BuildImplicitMemberExpr(SS, R, TemplateArgs, false);
2061
2062 case IMA_Static:
2063 case IMA_Mixed_StaticContext:
2064 case IMA_Unresolved_StaticContext:
2065 if (TemplateArgs)
2066 return BuildTemplateIdExpr(SS, R, false, *TemplateArgs);
2067 return BuildDeclarationNameExpr(SS, R, false);
2068
2069 case IMA_Error_StaticContext:
2070 case IMA_Error_Unrelated:
John McCall5808ce42011-02-03 08:15:49 +00002071 DiagnoseInstanceReference(*this, SS, R.getRepresentativeDecl(),
2072 R.getLookupNameInfo());
John McCall3b4294e2009-12-16 12:17:52 +00002073 return ExprError();
2074 }
2075
2076 llvm_unreachable("unexpected instance member access kind");
2077 return ExprError();
2078}
2079
John McCall129e2df2009-11-30 22:42:35 +00002080/// BuildQualifiedDeclarationNameExpr - Build a C++ qualified
2081/// declaration name, generally during template instantiation.
2082/// There's a large number of things which don't need to be done along
2083/// this path.
John McCall60d7b3a2010-08-24 06:29:42 +00002084ExprResult
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00002085Sema::BuildQualifiedDeclarationNameExpr(CXXScopeSpec &SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00002086 const DeclarationNameInfo &NameInfo) {
John McCallf7a1a742009-11-24 19:00:30 +00002087 DeclContext *DC;
Douglas Gregore6ec5c42010-04-28 07:04:26 +00002088 if (!(DC = computeDeclContext(SS, false)) || DC->isDependentContext())
Abramo Bagnara25777432010-08-11 22:01:17 +00002089 return BuildDependentDeclRefExpr(SS, NameInfo, 0);
John McCallf7a1a742009-11-24 19:00:30 +00002090
John McCall77bb1aa2010-05-01 00:40:08 +00002091 if (RequireCompleteDeclContext(SS, DC))
Douglas Gregore6ec5c42010-04-28 07:04:26 +00002092 return ExprError();
2093
Abramo Bagnara25777432010-08-11 22:01:17 +00002094 LookupResult R(*this, NameInfo, LookupOrdinaryName);
John McCallf7a1a742009-11-24 19:00:30 +00002095 LookupQualifiedName(R, DC);
2096
2097 if (R.isAmbiguous())
2098 return ExprError();
2099
2100 if (R.empty()) {
Abramo Bagnara25777432010-08-11 22:01:17 +00002101 Diag(NameInfo.getLoc(), diag::err_no_member)
2102 << NameInfo.getName() << DC << SS.getRange();
John McCallf7a1a742009-11-24 19:00:30 +00002103 return ExprError();
2104 }
2105
2106 return BuildDeclarationNameExpr(SS, R, /*ADL*/ false);
2107}
2108
2109/// LookupInObjCMethod - The parser has read a name in, and Sema has
2110/// detected that we're currently inside an ObjC method. Perform some
2111/// additional lookup.
2112///
2113/// Ideally, most of this would be done by lookup, but there's
2114/// actually quite a lot of extra work involved.
2115///
2116/// Returns a null sentinel to indicate trivial success.
John McCall60d7b3a2010-08-24 06:29:42 +00002117ExprResult
John McCallf7a1a742009-11-24 19:00:30 +00002118Sema::LookupInObjCMethod(LookupResult &Lookup, Scope *S,
Chris Lattnereb483eb2010-04-11 08:28:14 +00002119 IdentifierInfo *II, bool AllowBuiltinCreation) {
John McCallf7a1a742009-11-24 19:00:30 +00002120 SourceLocation Loc = Lookup.getNameLoc();
Chris Lattneraec43db2010-04-12 05:10:17 +00002121 ObjCMethodDecl *CurMethod = getCurMethodDecl();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00002122
John McCallf7a1a742009-11-24 19:00:30 +00002123 // There are two cases to handle here. 1) scoped lookup could have failed,
2124 // in which case we should look for an ivar. 2) scoped lookup could have
2125 // found a decl, but that decl is outside the current instance method (i.e.
2126 // a global variable). In these two cases, we do a lookup for an ivar with
2127 // this name, if the lookup sucedes, we replace it our current decl.
2128
2129 // If we're in a class method, we don't normally want to look for
2130 // ivars. But if we don't find anything else, and there's an
2131 // ivar, that's an error.
Chris Lattneraec43db2010-04-12 05:10:17 +00002132 bool IsClassMethod = CurMethod->isClassMethod();
John McCallf7a1a742009-11-24 19:00:30 +00002133
2134 bool LookForIvars;
2135 if (Lookup.empty())
2136 LookForIvars = true;
2137 else if (IsClassMethod)
2138 LookForIvars = false;
2139 else
2140 LookForIvars = (Lookup.isSingleResult() &&
2141 Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod());
Fariborz Jahanian412e7982010-02-09 19:31:38 +00002142 ObjCInterfaceDecl *IFace = 0;
John McCallf7a1a742009-11-24 19:00:30 +00002143 if (LookForIvars) {
Chris Lattneraec43db2010-04-12 05:10:17 +00002144 IFace = CurMethod->getClassInterface();
John McCallf7a1a742009-11-24 19:00:30 +00002145 ObjCInterfaceDecl *ClassDeclared;
2146 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) {
2147 // Diagnose using an ivar in a class method.
2148 if (IsClassMethod)
2149 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method)
2150 << IV->getDeclName());
2151
2152 // If we're referencing an invalid decl, just return this as a silent
2153 // error node. The error diagnostic was already emitted on the decl.
2154 if (IV->isInvalidDecl())
2155 return ExprError();
2156
2157 // Check if referencing a field with __attribute__((deprecated)).
2158 if (DiagnoseUseOfDecl(IV, Loc))
2159 return ExprError();
2160
2161 // Diagnose the use of an ivar outside of the declaring class.
2162 if (IV->getAccessControl() == ObjCIvarDecl::Private &&
2163 ClassDeclared != IFace)
2164 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName();
2165
2166 // FIXME: This should use a new expr for a direct reference, don't
2167 // turn this into Self->ivar, just return a BareIVarExpr or something.
2168 IdentifierInfo &II = Context.Idents.get("self");
2169 UnqualifiedId SelfName;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002170 SelfName.setIdentifier(&II, SourceLocation());
John McCallf7a1a742009-11-24 19:00:30 +00002171 CXXScopeSpec SelfScopeSpec;
John McCall60d7b3a2010-08-24 06:29:42 +00002172 ExprResult SelfExpr = ActOnIdExpression(S, SelfScopeSpec,
Douglas Gregore45bb6a2010-09-22 16:33:13 +00002173 SelfName, false, false);
2174 if (SelfExpr.isInvalid())
2175 return ExprError();
2176
John Wiegley429bb272011-04-08 18:41:53 +00002177 SelfExpr = DefaultLvalueConversion(SelfExpr.take());
2178 if (SelfExpr.isInvalid())
2179 return ExprError();
John McCall409fa9a2010-12-06 20:48:59 +00002180
John McCallf7a1a742009-11-24 19:00:30 +00002181 MarkDeclarationReferenced(Loc, IV);
Fariborz Jahanianb8f17ab2011-04-12 23:39:33 +00002182 Expr *base = SelfExpr.take();
2183 base = base->IgnoreParenImpCasts();
2184 if (const DeclRefExpr *DE = dyn_cast<DeclRefExpr>(base)) {
2185 const NamedDecl *ND = DE->getDecl();
2186 if (!isa<ImplicitParamDecl>(ND)) {
Fariborz Jahanianeefa76e2011-04-15 17:04:42 +00002187 // relax the rule such that it is allowed to have a shadow 'self'
2188 // where stand-alone ivar can be found in this 'self' object.
2189 // This is to match gcc's behavior.
2190 ObjCInterfaceDecl *selfIFace = 0;
2191 if (const ObjCObjectPointerType *OPT =
2192 base->getType()->getAsObjCInterfacePointerType())
2193 selfIFace = OPT->getInterfaceDecl();
2194 if (!selfIFace ||
2195 !selfIFace->lookupInstanceVariable(IV->getIdentifier())) {
Fariborz Jahanianb8f17ab2011-04-12 23:39:33 +00002196 Diag(Loc, diag::error_implicit_ivar_access)
2197 << IV->getDeclName();
2198 Diag(ND->getLocation(), diag::note_declared_at);
2199 return ExprError();
2200 }
Fariborz Jahanianeefa76e2011-04-15 17:04:42 +00002201 }
Fariborz Jahanianb8f17ab2011-04-12 23:39:33 +00002202 }
John McCallf7a1a742009-11-24 19:00:30 +00002203 return Owned(new (Context)
2204 ObjCIvarRefExpr(IV, IV->getType(), Loc,
John Wiegley429bb272011-04-08 18:41:53 +00002205 SelfExpr.take(), true, true));
John McCallf7a1a742009-11-24 19:00:30 +00002206 }
Chris Lattneraec43db2010-04-12 05:10:17 +00002207 } else if (CurMethod->isInstanceMethod()) {
John McCallf7a1a742009-11-24 19:00:30 +00002208 // We should warn if a local variable hides an ivar.
Chris Lattneraec43db2010-04-12 05:10:17 +00002209 ObjCInterfaceDecl *IFace = CurMethod->getClassInterface();
John McCallf7a1a742009-11-24 19:00:30 +00002210 ObjCInterfaceDecl *ClassDeclared;
2211 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) {
2212 if (IV->getAccessControl() != ObjCIvarDecl::Private ||
2213 IFace == ClassDeclared)
2214 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName();
2215 }
2216 }
2217
Fariborz Jahanian48c2d562010-01-12 23:58:59 +00002218 if (Lookup.empty() && II && AllowBuiltinCreation) {
2219 // FIXME. Consolidate this with similar code in LookupName.
2220 if (unsigned BuiltinID = II->getBuiltinID()) {
2221 if (!(getLangOptions().CPlusPlus &&
2222 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))) {
2223 NamedDecl *D = LazilyCreateBuiltin((IdentifierInfo *)II, BuiltinID,
2224 S, Lookup.isForRedeclaration(),
2225 Lookup.getNameLoc());
2226 if (D) Lookup.addDecl(D);
2227 }
2228 }
2229 }
John McCallf7a1a742009-11-24 19:00:30 +00002230 // Sentinel value saying that we didn't do anything special.
2231 return Owned((Expr*) 0);
Douglas Gregor751f9a42009-06-30 15:47:41 +00002232}
John McCallba135432009-11-21 08:51:07 +00002233
John McCall6bb80172010-03-30 21:47:33 +00002234/// \brief Cast a base object to a member's actual type.
2235///
2236/// Logically this happens in three phases:
2237///
2238/// * First we cast from the base type to the naming class.
2239/// The naming class is the class into which we were looking
2240/// when we found the member; it's the qualifier type if a
2241/// qualifier was provided, and otherwise it's the base type.
2242///
2243/// * Next we cast from the naming class to the declaring class.
2244/// If the member we found was brought into a class's scope by
2245/// a using declaration, this is that class; otherwise it's
2246/// the class declaring the member.
2247///
2248/// * Finally we cast from the declaring class to the "true"
2249/// declaring class of the member. This conversion does not
2250/// obey access control.
John Wiegley429bb272011-04-08 18:41:53 +00002251ExprResult
2252Sema::PerformObjectMemberConversion(Expr *From,
Douglas Gregor5fccd362010-03-03 23:55:11 +00002253 NestedNameSpecifier *Qualifier,
John McCall6bb80172010-03-30 21:47:33 +00002254 NamedDecl *FoundDecl,
Douglas Gregor5fccd362010-03-03 23:55:11 +00002255 NamedDecl *Member) {
2256 CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Member->getDeclContext());
2257 if (!RD)
John Wiegley429bb272011-04-08 18:41:53 +00002258 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002259
Douglas Gregor5fccd362010-03-03 23:55:11 +00002260 QualType DestRecordType;
2261 QualType DestType;
2262 QualType FromRecordType;
2263 QualType FromType = From->getType();
2264 bool PointerConversions = false;
2265 if (isa<FieldDecl>(Member)) {
2266 DestRecordType = Context.getCanonicalType(Context.getTypeDeclType(RD));
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002267
Douglas Gregor5fccd362010-03-03 23:55:11 +00002268 if (FromType->getAs<PointerType>()) {
2269 DestType = Context.getPointerType(DestRecordType);
2270 FromRecordType = FromType->getPointeeType();
2271 PointerConversions = true;
2272 } else {
2273 DestType = DestRecordType;
2274 FromRecordType = FromType;
Fariborz Jahanian98a541e2009-07-29 18:40:24 +00002275 }
Douglas Gregor5fccd362010-03-03 23:55:11 +00002276 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) {
2277 if (Method->isStatic())
John Wiegley429bb272011-04-08 18:41:53 +00002278 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002279
Douglas Gregor5fccd362010-03-03 23:55:11 +00002280 DestType = Method->getThisType(Context);
2281 DestRecordType = DestType->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002282
Douglas Gregor5fccd362010-03-03 23:55:11 +00002283 if (FromType->getAs<PointerType>()) {
2284 FromRecordType = FromType->getPointeeType();
2285 PointerConversions = true;
2286 } else {
2287 FromRecordType = FromType;
2288 DestType = DestRecordType;
2289 }
2290 } else {
2291 // No conversion necessary.
John Wiegley429bb272011-04-08 18:41:53 +00002292 return Owned(From);
Douglas Gregor5fccd362010-03-03 23:55:11 +00002293 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002294
Douglas Gregor5fccd362010-03-03 23:55:11 +00002295 if (DestType->isDependentType() || FromType->isDependentType())
John Wiegley429bb272011-04-08 18:41:53 +00002296 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002297
Douglas Gregor5fccd362010-03-03 23:55:11 +00002298 // If the unqualified types are the same, no conversion is necessary.
2299 if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
John Wiegley429bb272011-04-08 18:41:53 +00002300 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002301
John McCall6bb80172010-03-30 21:47:33 +00002302 SourceRange FromRange = From->getSourceRange();
2303 SourceLocation FromLoc = FromRange.getBegin();
2304
John McCall5baba9d2010-08-25 10:28:54 +00002305 ExprValueKind VK = CastCategory(From);
Sebastian Redl906082e2010-07-20 04:20:21 +00002306
Douglas Gregor5fccd362010-03-03 23:55:11 +00002307 // C++ [class.member.lookup]p8:
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002308 // [...] Ambiguities can often be resolved by qualifying a name with its
Douglas Gregor5fccd362010-03-03 23:55:11 +00002309 // class name.
2310 //
2311 // If the member was a qualified name and the qualified referred to a
2312 // specific base subobject type, we'll cast to that intermediate type
2313 // first and then to the object in which the member is declared. That allows
2314 // one to resolve ambiguities in, e.g., a diamond-shaped hierarchy such as:
2315 //
2316 // class Base { public: int x; };
2317 // class Derived1 : public Base { };
2318 // class Derived2 : public Base { };
2319 // class VeryDerived : public Derived1, public Derived2 { void f(); };
2320 //
2321 // void VeryDerived::f() {
2322 // x = 17; // error: ambiguous base subobjects
2323 // Derived1::x = 17; // okay, pick the Base subobject of Derived1
2324 // }
Douglas Gregor5fccd362010-03-03 23:55:11 +00002325 if (Qualifier) {
John McCall6bb80172010-03-30 21:47:33 +00002326 QualType QType = QualType(Qualifier->getAsType(), 0);
2327 assert(!QType.isNull() && "lookup done with dependent qualifier?");
2328 assert(QType->isRecordType() && "lookup done with non-record type");
2329
2330 QualType QRecordType = QualType(QType->getAs<RecordType>(), 0);
2331
2332 // In C++98, the qualifier type doesn't actually have to be a base
2333 // type of the object type, in which case we just ignore it.
2334 // Otherwise build the appropriate casts.
2335 if (IsDerivedFrom(FromRecordType, QRecordType)) {
John McCallf871d0c2010-08-07 06:22:56 +00002336 CXXCastPath BasePath;
John McCall6bb80172010-03-30 21:47:33 +00002337 if (CheckDerivedToBaseConversion(FromRecordType, QRecordType,
Anders Carlssoncee22422010-04-24 19:22:20 +00002338 FromLoc, FromRange, &BasePath))
John Wiegley429bb272011-04-08 18:41:53 +00002339 return ExprError();
John McCall6bb80172010-03-30 21:47:33 +00002340
Douglas Gregor5fccd362010-03-03 23:55:11 +00002341 if (PointerConversions)
John McCall6bb80172010-03-30 21:47:33 +00002342 QType = Context.getPointerType(QType);
John Wiegley429bb272011-04-08 18:41:53 +00002343 From = ImpCastExprToType(From, QType, CK_UncheckedDerivedToBase,
2344 VK, &BasePath).take();
John McCall6bb80172010-03-30 21:47:33 +00002345
2346 FromType = QType;
2347 FromRecordType = QRecordType;
2348
2349 // If the qualifier type was the same as the destination type,
2350 // we're done.
2351 if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
John Wiegley429bb272011-04-08 18:41:53 +00002352 return Owned(From);
Douglas Gregor5fccd362010-03-03 23:55:11 +00002353 }
2354 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002355
John McCall6bb80172010-03-30 21:47:33 +00002356 bool IgnoreAccess = false;
Douglas Gregor5fccd362010-03-03 23:55:11 +00002357
John McCall6bb80172010-03-30 21:47:33 +00002358 // If we actually found the member through a using declaration, cast
2359 // down to the using declaration's type.
2360 //
2361 // Pointer equality is fine here because only one declaration of a
2362 // class ever has member declarations.
2363 if (FoundDecl->getDeclContext() != Member->getDeclContext()) {
2364 assert(isa<UsingShadowDecl>(FoundDecl));
2365 QualType URecordType = Context.getTypeDeclType(
2366 cast<CXXRecordDecl>(FoundDecl->getDeclContext()));
2367
2368 // We only need to do this if the naming-class to declaring-class
2369 // conversion is non-trivial.
2370 if (!Context.hasSameUnqualifiedType(FromRecordType, URecordType)) {
2371 assert(IsDerivedFrom(FromRecordType, URecordType));
John McCallf871d0c2010-08-07 06:22:56 +00002372 CXXCastPath BasePath;
John McCall6bb80172010-03-30 21:47:33 +00002373 if (CheckDerivedToBaseConversion(FromRecordType, URecordType,
Anders Carlssoncee22422010-04-24 19:22:20 +00002374 FromLoc, FromRange, &BasePath))
John Wiegley429bb272011-04-08 18:41:53 +00002375 return ExprError();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00002376
John McCall6bb80172010-03-30 21:47:33 +00002377 QualType UType = URecordType;
2378 if (PointerConversions)
2379 UType = Context.getPointerType(UType);
John Wiegley429bb272011-04-08 18:41:53 +00002380 From = ImpCastExprToType(From, UType, CK_UncheckedDerivedToBase,
2381 VK, &BasePath).take();
John McCall6bb80172010-03-30 21:47:33 +00002382 FromType = UType;
2383 FromRecordType = URecordType;
2384 }
2385
2386 // We don't do access control for the conversion from the
2387 // declaring class to the true declaring class.
2388 IgnoreAccess = true;
Douglas Gregor5fccd362010-03-03 23:55:11 +00002389 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002390
John McCallf871d0c2010-08-07 06:22:56 +00002391 CXXCastPath BasePath;
Anders Carlssoncee22422010-04-24 19:22:20 +00002392 if (CheckDerivedToBaseConversion(FromRecordType, DestRecordType,
2393 FromLoc, FromRange, &BasePath,
John McCall6bb80172010-03-30 21:47:33 +00002394 IgnoreAccess))
John Wiegley429bb272011-04-08 18:41:53 +00002395 return ExprError();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002396
John Wiegley429bb272011-04-08 18:41:53 +00002397 return ImpCastExprToType(From, DestType, CK_UncheckedDerivedToBase,
2398 VK, &BasePath);
Fariborz Jahanian98a541e2009-07-29 18:40:24 +00002399}
Douglas Gregor751f9a42009-06-30 15:47:41 +00002400
Douglas Gregor83f6faf2009-08-31 23:41:50 +00002401/// \brief Build a MemberExpr AST node.
Mike Stump1eb44332009-09-09 15:08:12 +00002402static MemberExpr *BuildMemberExpr(ASTContext &C, Expr *Base, bool isArrow,
Eli Friedmanf595cc42009-12-04 06:40:45 +00002403 const CXXScopeSpec &SS, ValueDecl *Member,
John McCall161755a2010-04-06 21:38:20 +00002404 DeclAccessPair FoundDecl,
Abramo Bagnara25777432010-08-11 22:01:17 +00002405 const DeclarationNameInfo &MemberNameInfo,
2406 QualType Ty,
John McCallf89e55a2010-11-18 06:31:45 +00002407 ExprValueKind VK, ExprObjectKind OK,
John McCallf7a1a742009-11-24 19:00:30 +00002408 const TemplateArgumentListInfo *TemplateArgs = 0) {
Douglas Gregor40d96a62011-02-28 21:54:11 +00002409 return MemberExpr::Create(C, Base, isArrow, SS.getWithLocInContext(C),
Abramo Bagnara25777432010-08-11 22:01:17 +00002410 Member, FoundDecl, MemberNameInfo,
John McCallf89e55a2010-11-18 06:31:45 +00002411 TemplateArgs, Ty, VK, OK);
Douglas Gregorbd4c4ae2009-08-26 22:36:53 +00002412}
2413
John McCalldfa1edb2010-11-23 20:48:44 +00002414static ExprResult
2415BuildFieldReferenceExpr(Sema &S, Expr *BaseExpr, bool IsArrow,
2416 const CXXScopeSpec &SS, FieldDecl *Field,
2417 DeclAccessPair FoundDecl,
2418 const DeclarationNameInfo &MemberNameInfo) {
2419 // x.a is an l-value if 'a' has a reference type. Otherwise:
2420 // x.a is an l-value/x-value/pr-value if the base is (and note
2421 // that *x is always an l-value), except that if the base isn't
2422 // an ordinary object then we must have an rvalue.
2423 ExprValueKind VK = VK_LValue;
2424 ExprObjectKind OK = OK_Ordinary;
2425 if (!IsArrow) {
2426 if (BaseExpr->getObjectKind() == OK_Ordinary)
2427 VK = BaseExpr->getValueKind();
2428 else
2429 VK = VK_RValue;
2430 }
2431 if (VK != VK_RValue && Field->isBitField())
2432 OK = OK_BitField;
2433
2434 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref]
2435 QualType MemberType = Field->getType();
2436 if (const ReferenceType *Ref = MemberType->getAs<ReferenceType>()) {
2437 MemberType = Ref->getPointeeType();
2438 VK = VK_LValue;
2439 } else {
2440 QualType BaseType = BaseExpr->getType();
2441 if (IsArrow) BaseType = BaseType->getAs<PointerType>()->getPointeeType();
2442
2443 Qualifiers BaseQuals = BaseType.getQualifiers();
2444
2445 // GC attributes are never picked up by members.
2446 BaseQuals.removeObjCGCAttr();
2447
2448 // CVR attributes from the base are picked up by members,
2449 // except that 'mutable' members don't pick up 'const'.
2450 if (Field->isMutable()) BaseQuals.removeConst();
2451
2452 Qualifiers MemberQuals
2453 = S.Context.getCanonicalType(MemberType).getQualifiers();
2454
2455 // TR 18037 does not allow fields to be declared with address spaces.
2456 assert(!MemberQuals.hasAddressSpace());
2457
2458 Qualifiers Combined = BaseQuals + MemberQuals;
2459 if (Combined != MemberQuals)
2460 MemberType = S.Context.getQualifiedType(MemberType, Combined);
2461 }
2462
2463 S.MarkDeclarationReferenced(MemberNameInfo.getLoc(), Field);
John Wiegley429bb272011-04-08 18:41:53 +00002464 ExprResult Base =
2465 S.PerformObjectMemberConversion(BaseExpr, SS.getScopeRep(),
2466 FoundDecl, Field);
2467 if (Base.isInvalid())
John McCalldfa1edb2010-11-23 20:48:44 +00002468 return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00002469 return S.Owned(BuildMemberExpr(S.Context, Base.take(), IsArrow, SS,
John McCalldfa1edb2010-11-23 20:48:44 +00002470 Field, FoundDecl, MemberNameInfo,
2471 MemberType, VK, OK));
2472}
2473
John McCallaa81e162009-12-01 22:10:20 +00002474/// Builds an implicit member access expression. The current context
2475/// is known to be an instance method, and the given unqualified lookup
2476/// set is known to contain only instance members, at least one of which
2477/// is from an appropriate type.
John McCall60d7b3a2010-08-24 06:29:42 +00002478ExprResult
John McCallaa81e162009-12-01 22:10:20 +00002479Sema::BuildImplicitMemberExpr(const CXXScopeSpec &SS,
2480 LookupResult &R,
2481 const TemplateArgumentListInfo *TemplateArgs,
2482 bool IsKnownInstance) {
John McCallf7a1a742009-11-24 19:00:30 +00002483 assert(!R.empty() && !R.isAmbiguous());
2484
John McCall5808ce42011-02-03 08:15:49 +00002485 SourceLocation loc = R.getNameLoc();
Sebastian Redlebc07d52009-02-03 20:19:35 +00002486
Douglas Gregorbcbffc42009-01-07 00:43:41 +00002487 // We may have found a field within an anonymous union or struct
2488 // (C++ [class.union]).
John McCallf7a1a742009-11-24 19:00:30 +00002489 // FIXME: template-ids inside anonymous structs?
Francois Pichet87c2e122010-11-21 06:08:52 +00002490 if (IndirectFieldDecl *FD = R.getAsSingle<IndirectFieldDecl>())
John McCall5808ce42011-02-03 08:15:49 +00002491 return BuildAnonymousStructUnionMemberReference(SS, R.getNameLoc(), FD);
Francois Pichet87c2e122010-11-21 06:08:52 +00002492
John McCall5808ce42011-02-03 08:15:49 +00002493 // If this is known to be an instance access, go ahead and build an
2494 // implicit 'this' expression now.
John McCallaa81e162009-12-01 22:10:20 +00002495 // 'this' expression now.
Richard Smith7a614d82011-06-11 17:19:42 +00002496 QualType ThisTy = getAndCaptureCurrentThisType();
2497 assert(!ThisTy.isNull() && "didn't correctly pre-flight capture of 'this'");
John McCall5808ce42011-02-03 08:15:49 +00002498
John McCall5808ce42011-02-03 08:15:49 +00002499 Expr *baseExpr = 0; // null signifies implicit access
John McCallaa81e162009-12-01 22:10:20 +00002500 if (IsKnownInstance) {
Douglas Gregor828a1972010-01-07 23:12:05 +00002501 SourceLocation Loc = R.getNameLoc();
2502 if (SS.getRange().isValid())
2503 Loc = SS.getRange().getBegin();
Richard Smith7a614d82011-06-11 17:19:42 +00002504 baseExpr = new (Context) CXXThisExpr(loc, ThisTy, /*isImplicit=*/true);
Douglas Gregor88a35142008-12-22 05:46:06 +00002505 }
2506
Richard Smith7a614d82011-06-11 17:19:42 +00002507 return BuildMemberReferenceExpr(baseExpr, ThisTy,
John McCallaa81e162009-12-01 22:10:20 +00002508 /*OpLoc*/ SourceLocation(),
2509 /*IsArrow*/ true,
John McCallc2233c52010-01-15 08:34:02 +00002510 SS,
2511 /*FirstQualifierInScope*/ 0,
2512 R, TemplateArgs);
John McCallba135432009-11-21 08:51:07 +00002513}
2514
John McCallf7a1a742009-11-24 19:00:30 +00002515bool Sema::UseArgumentDependentLookup(const CXXScopeSpec &SS,
John McCall5b3f9132009-11-22 01:44:31 +00002516 const LookupResult &R,
2517 bool HasTrailingLParen) {
John McCallba135432009-11-21 08:51:07 +00002518 // Only when used directly as the postfix-expression of a call.
2519 if (!HasTrailingLParen)
2520 return false;
2521
2522 // Never if a scope specifier was provided.
John McCallf7a1a742009-11-24 19:00:30 +00002523 if (SS.isSet())
John McCallba135432009-11-21 08:51:07 +00002524 return false;
2525
2526 // Only in C++ or ObjC++.
John McCall5b3f9132009-11-22 01:44:31 +00002527 if (!getLangOptions().CPlusPlus)
John McCallba135432009-11-21 08:51:07 +00002528 return false;
2529
2530 // Turn off ADL when we find certain kinds of declarations during
2531 // normal lookup:
2532 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
2533 NamedDecl *D = *I;
2534
2535 // C++0x [basic.lookup.argdep]p3:
2536 // -- a declaration of a class member
2537 // Since using decls preserve this property, we check this on the
2538 // original decl.
John McCall3b4294e2009-12-16 12:17:52 +00002539 if (D->isCXXClassMember())
John McCallba135432009-11-21 08:51:07 +00002540 return false;
2541
2542 // C++0x [basic.lookup.argdep]p3:
2543 // -- a block-scope function declaration that is not a
2544 // using-declaration
2545 // NOTE: we also trigger this for function templates (in fact, we
2546 // don't check the decl type at all, since all other decl types
2547 // turn off ADL anyway).
2548 if (isa<UsingShadowDecl>(D))
2549 D = cast<UsingShadowDecl>(D)->getTargetDecl();
2550 else if (D->getDeclContext()->isFunctionOrMethod())
2551 return false;
2552
2553 // C++0x [basic.lookup.argdep]p3:
2554 // -- a declaration that is neither a function or a function
2555 // template
2556 // And also for builtin functions.
2557 if (isa<FunctionDecl>(D)) {
2558 FunctionDecl *FDecl = cast<FunctionDecl>(D);
2559
2560 // But also builtin functions.
2561 if (FDecl->getBuiltinID() && FDecl->isImplicit())
2562 return false;
2563 } else if (!isa<FunctionTemplateDecl>(D))
2564 return false;
2565 }
2566
2567 return true;
2568}
2569
2570
John McCallba135432009-11-21 08:51:07 +00002571/// Diagnoses obvious problems with the use of the given declaration
2572/// as an expression. This is only actually called for lookups that
2573/// were not overloaded, and it doesn't promise that the declaration
2574/// will in fact be used.
2575static bool CheckDeclInExpr(Sema &S, SourceLocation Loc, NamedDecl *D) {
Richard Smith162e1c12011-04-15 14:24:37 +00002576 if (isa<TypedefNameDecl>(D)) {
John McCallba135432009-11-21 08:51:07 +00002577 S.Diag(Loc, diag::err_unexpected_typedef) << D->getDeclName();
2578 return true;
2579 }
2580
2581 if (isa<ObjCInterfaceDecl>(D)) {
2582 S.Diag(Loc, diag::err_unexpected_interface) << D->getDeclName();
2583 return true;
2584 }
2585
2586 if (isa<NamespaceDecl>(D)) {
2587 S.Diag(Loc, diag::err_unexpected_namespace) << D->getDeclName();
2588 return true;
2589 }
2590
2591 return false;
2592}
2593
John McCall60d7b3a2010-08-24 06:29:42 +00002594ExprResult
John McCallf7a1a742009-11-24 19:00:30 +00002595Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
John McCall5b3f9132009-11-22 01:44:31 +00002596 LookupResult &R,
2597 bool NeedsADL) {
John McCallfead20c2009-12-08 22:45:53 +00002598 // If this is a single, fully-resolved result and we don't need ADL,
2599 // just build an ordinary singleton decl ref.
Douglas Gregor86b8e092010-01-29 17:15:43 +00002600 if (!NeedsADL && R.isSingleResult() && !R.getAsSingle<FunctionTemplateDecl>())
Abramo Bagnara25777432010-08-11 22:01:17 +00002601 return BuildDeclarationNameExpr(SS, R.getLookupNameInfo(),
2602 R.getFoundDecl());
John McCallba135432009-11-21 08:51:07 +00002603
2604 // We only need to check the declaration if there's exactly one
2605 // result, because in the overloaded case the results can only be
2606 // functions and function templates.
John McCall5b3f9132009-11-22 01:44:31 +00002607 if (R.isSingleResult() &&
2608 CheckDeclInExpr(*this, R.getNameLoc(), R.getFoundDecl()))
John McCallba135432009-11-21 08:51:07 +00002609 return ExprError();
2610
John McCallc373d482010-01-27 01:50:18 +00002611 // Otherwise, just build an unresolved lookup expression. Suppress
2612 // any lookup-related diagnostics; we'll hash these out later, when
2613 // we've picked a target.
2614 R.suppressDiagnostics();
2615
John McCallba135432009-11-21 08:51:07 +00002616 UnresolvedLookupExpr *ULE
Douglas Gregorbebbe0d2010-12-15 01:34:56 +00002617 = UnresolvedLookupExpr::Create(Context, R.getNamingClass(),
Douglas Gregor4c9be892011-02-28 20:01:57 +00002618 SS.getWithLocInContext(Context),
2619 R.getLookupNameInfo(),
Douglas Gregor5a84dec2010-05-23 18:57:34 +00002620 NeedsADL, R.isOverloadedResult(),
2621 R.begin(), R.end());
John McCallba135432009-11-21 08:51:07 +00002622
2623 return Owned(ULE);
2624}
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002625
John McCallba135432009-11-21 08:51:07 +00002626/// \brief Complete semantic analysis for a reference to the given declaration.
John McCall60d7b3a2010-08-24 06:29:42 +00002627ExprResult
John McCallf7a1a742009-11-24 19:00:30 +00002628Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00002629 const DeclarationNameInfo &NameInfo,
2630 NamedDecl *D) {
John McCallba135432009-11-21 08:51:07 +00002631 assert(D && "Cannot refer to a NULL declaration");
John McCall7453ed42009-11-22 00:44:51 +00002632 assert(!isa<FunctionTemplateDecl>(D) &&
2633 "Cannot refer unambiguously to a function template");
John McCallba135432009-11-21 08:51:07 +00002634
Abramo Bagnara25777432010-08-11 22:01:17 +00002635 SourceLocation Loc = NameInfo.getLoc();
John McCallba135432009-11-21 08:51:07 +00002636 if (CheckDeclInExpr(*this, Loc, D))
2637 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00002638
Douglas Gregor9af2f522009-12-01 16:58:18 +00002639 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) {
2640 // Specifically diagnose references to class templates that are missing
2641 // a template argument list.
2642 Diag(Loc, diag::err_template_decl_ref)
2643 << Template << SS.getRange();
2644 Diag(Template->getLocation(), diag::note_template_decl_here);
2645 return ExprError();
2646 }
2647
2648 // Make sure that we're referring to a value.
2649 ValueDecl *VD = dyn_cast<ValueDecl>(D);
2650 if (!VD) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002651 Diag(Loc, diag::err_ref_non_value)
Douglas Gregor9af2f522009-12-01 16:58:18 +00002652 << D << SS.getRange();
John McCall87cf6702009-12-18 18:35:10 +00002653 Diag(D->getLocation(), diag::note_declared_at);
Douglas Gregor9af2f522009-12-01 16:58:18 +00002654 return ExprError();
2655 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002656
Douglas Gregor48f3bb92009-02-18 21:56:37 +00002657 // Check whether this declaration can be used. Note that we suppress
2658 // this check when we're going to perform argument-dependent lookup
2659 // on this function name, because this might not be the function
2660 // that overload resolution actually selects.
John McCallba135432009-11-21 08:51:07 +00002661 if (DiagnoseUseOfDecl(VD, Loc))
Douglas Gregor48f3bb92009-02-18 21:56:37 +00002662 return ExprError();
2663
Steve Naroffdd972f22008-09-05 22:11:13 +00002664 // Only create DeclRefExpr's for valid Decl's.
2665 if (VD->isInvalidDecl())
Sebastian Redlcd965b92009-01-18 18:53:16 +00002666 return ExprError();
2667
John McCall5808ce42011-02-03 08:15:49 +00002668 // Handle members of anonymous structs and unions. If we got here,
2669 // and the reference is to a class member indirect field, then this
2670 // must be the subject of a pointer-to-member expression.
2671 if (IndirectFieldDecl *indirectField = dyn_cast<IndirectFieldDecl>(VD))
2672 if (!indirectField->isCXXClassMember())
2673 return BuildAnonymousStructUnionMemberReference(SS, NameInfo.getLoc(),
2674 indirectField);
Francois Pichet87c2e122010-11-21 06:08:52 +00002675
Chris Lattner639e2d32008-10-20 05:16:36 +00002676 // If the identifier reference is inside a block, and it refers to a value
2677 // that is outside the block, create a BlockDeclRefExpr instead of a
2678 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when
2679 // the block is formed.
Steve Naroffdd972f22008-09-05 22:11:13 +00002680 //
Chris Lattner639e2d32008-10-20 05:16:36 +00002681 // We do not do this for things like enum constants, global variables, etc,
2682 // as they do not get snapshotted.
2683 //
John McCall6b5a61b2011-02-07 10:33:21 +00002684 switch (shouldCaptureValueReference(*this, NameInfo.getLoc(), VD)) {
John McCall469a1eb2011-02-02 13:00:07 +00002685 case CR_Error:
2686 return ExprError();
Mike Stump0d6fd572010-01-05 02:56:35 +00002687
John McCall469a1eb2011-02-02 13:00:07 +00002688 case CR_Capture:
John McCall6b5a61b2011-02-07 10:33:21 +00002689 assert(!SS.isSet() && "referenced local variable with scope specifier?");
2690 return BuildBlockDeclRefExpr(*this, VD, NameInfo, /*byref*/ false);
2691
2692 case CR_CaptureByRef:
2693 assert(!SS.isSet() && "referenced local variable with scope specifier?");
2694 return BuildBlockDeclRefExpr(*this, VD, NameInfo, /*byref*/ true);
John McCall76a40212011-02-09 01:13:10 +00002695
2696 case CR_NoCapture: {
2697 // If this reference is not in a block or if the referenced
2698 // variable is within the block, create a normal DeclRefExpr.
2699
2700 QualType type = VD->getType();
Daniel Dunbarb20de812011-02-10 18:29:28 +00002701 ExprValueKind valueKind = VK_RValue;
John McCall76a40212011-02-09 01:13:10 +00002702
2703 switch (D->getKind()) {
2704 // Ignore all the non-ValueDecl kinds.
2705#define ABSTRACT_DECL(kind)
2706#define VALUE(type, base)
2707#define DECL(type, base) \
2708 case Decl::type:
2709#include "clang/AST/DeclNodes.inc"
2710 llvm_unreachable("invalid value decl kind");
2711 return ExprError();
2712
2713 // These shouldn't make it here.
2714 case Decl::ObjCAtDefsField:
2715 case Decl::ObjCIvar:
2716 llvm_unreachable("forming non-member reference to ivar?");
2717 return ExprError();
2718
2719 // Enum constants are always r-values and never references.
2720 // Unresolved using declarations are dependent.
2721 case Decl::EnumConstant:
2722 case Decl::UnresolvedUsingValue:
2723 valueKind = VK_RValue;
2724 break;
2725
2726 // Fields and indirect fields that got here must be for
2727 // pointer-to-member expressions; we just call them l-values for
2728 // internal consistency, because this subexpression doesn't really
2729 // exist in the high-level semantics.
2730 case Decl::Field:
2731 case Decl::IndirectField:
2732 assert(getLangOptions().CPlusPlus &&
2733 "building reference to field in C?");
2734
2735 // These can't have reference type in well-formed programs, but
2736 // for internal consistency we do this anyway.
2737 type = type.getNonReferenceType();
2738 valueKind = VK_LValue;
2739 break;
2740
2741 // Non-type template parameters are either l-values or r-values
2742 // depending on the type.
2743 case Decl::NonTypeTemplateParm: {
2744 if (const ReferenceType *reftype = type->getAs<ReferenceType>()) {
2745 type = reftype->getPointeeType();
2746 valueKind = VK_LValue; // even if the parameter is an r-value reference
2747 break;
2748 }
2749
2750 // For non-references, we need to strip qualifiers just in case
2751 // the template parameter was declared as 'const int' or whatever.
2752 valueKind = VK_RValue;
2753 type = type.getUnqualifiedType();
2754 break;
2755 }
2756
2757 case Decl::Var:
2758 // In C, "extern void blah;" is valid and is an r-value.
2759 if (!getLangOptions().CPlusPlus &&
2760 !type.hasQualifiers() &&
2761 type->isVoidType()) {
2762 valueKind = VK_RValue;
2763 break;
2764 }
2765 // fallthrough
2766
2767 case Decl::ImplicitParam:
2768 case Decl::ParmVar:
2769 // These are always l-values.
2770 valueKind = VK_LValue;
2771 type = type.getNonReferenceType();
2772 break;
2773
2774 case Decl::Function: {
John McCall755d8492011-04-12 00:42:48 +00002775 const FunctionType *fty = type->castAs<FunctionType>();
2776
2777 // If we're referring to a function with an __unknown_anytype
2778 // result type, make the entire expression __unknown_anytype.
2779 if (fty->getResultType() == Context.UnknownAnyTy) {
2780 type = Context.UnknownAnyTy;
2781 valueKind = VK_RValue;
2782 break;
2783 }
2784
John McCall76a40212011-02-09 01:13:10 +00002785 // Functions are l-values in C++.
2786 if (getLangOptions().CPlusPlus) {
2787 valueKind = VK_LValue;
2788 break;
2789 }
2790
2791 // C99 DR 316 says that, if a function type comes from a
2792 // function definition (without a prototype), that type is only
2793 // used for checking compatibility. Therefore, when referencing
2794 // the function, we pretend that we don't have the full function
2795 // type.
John McCall755d8492011-04-12 00:42:48 +00002796 if (!cast<FunctionDecl>(VD)->hasPrototype() &&
2797 isa<FunctionProtoType>(fty))
2798 type = Context.getFunctionNoProtoType(fty->getResultType(),
2799 fty->getExtInfo());
John McCall76a40212011-02-09 01:13:10 +00002800
2801 // Functions are r-values in C.
2802 valueKind = VK_RValue;
2803 break;
2804 }
2805
2806 case Decl::CXXMethod:
John McCall755d8492011-04-12 00:42:48 +00002807 // If we're referring to a method with an __unknown_anytype
2808 // result type, make the entire expression __unknown_anytype.
2809 // This should only be possible with a type written directly.
2810 if (const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(VD->getType()))
2811 if (proto->getResultType() == Context.UnknownAnyTy) {
2812 type = Context.UnknownAnyTy;
2813 valueKind = VK_RValue;
2814 break;
2815 }
2816
John McCall76a40212011-02-09 01:13:10 +00002817 // C++ methods are l-values if static, r-values if non-static.
2818 if (cast<CXXMethodDecl>(VD)->isStatic()) {
2819 valueKind = VK_LValue;
2820 break;
2821 }
2822 // fallthrough
2823
2824 case Decl::CXXConversion:
2825 case Decl::CXXDestructor:
2826 case Decl::CXXConstructor:
2827 valueKind = VK_RValue;
2828 break;
2829 }
2830
2831 return BuildDeclRefExpr(VD, type, valueKind, NameInfo, &SS);
2832 }
2833
John McCall469a1eb2011-02-02 13:00:07 +00002834 }
John McCallf89e55a2010-11-18 06:31:45 +00002835
John McCall6b5a61b2011-02-07 10:33:21 +00002836 llvm_unreachable("unknown capture result");
2837 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00002838}
2839
John McCall755d8492011-04-12 00:42:48 +00002840ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, tok::TokenKind Kind) {
Chris Lattnerd9f69102008-08-10 01:53:14 +00002841 PredefinedExpr::IdentType IT;
Sebastian Redlcd965b92009-01-18 18:53:16 +00002842
Reid Spencer5f016e22007-07-11 17:01:13 +00002843 switch (Kind) {
Chris Lattner1423ea42008-01-12 18:39:25 +00002844 default: assert(0 && "Unknown simple primary expr!");
Chris Lattnerd9f69102008-08-10 01:53:14 +00002845 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2]
2846 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break;
2847 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00002848 }
Chris Lattner1423ea42008-01-12 18:39:25 +00002849
Chris Lattnerfa28b302008-01-12 08:14:25 +00002850 // Pre-defined identifiers are of type char[x], where x is the length of the
2851 // string.
Mike Stump1eb44332009-09-09 15:08:12 +00002852
Anders Carlsson3a082d82009-09-08 18:24:21 +00002853 Decl *currentDecl = getCurFunctionOrMethodDecl();
Fariborz Jahanianeb024ac2010-07-23 21:53:24 +00002854 if (!currentDecl && getCurBlock())
2855 currentDecl = getCurBlock()->TheDecl;
Anders Carlsson3a082d82009-09-08 18:24:21 +00002856 if (!currentDecl) {
Chris Lattnerb0da9232008-12-12 05:05:20 +00002857 Diag(Loc, diag::ext_predef_outside_function);
Anders Carlsson3a082d82009-09-08 18:24:21 +00002858 currentDecl = Context.getTranslationUnitDecl();
Chris Lattnerb0da9232008-12-12 05:05:20 +00002859 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002860
Anders Carlsson773f3972009-09-11 01:22:35 +00002861 QualType ResTy;
2862 if (cast<DeclContext>(currentDecl)->isDependentContext()) {
2863 ResTy = Context.DependentTy;
2864 } else {
Anders Carlsson848fa642010-02-11 18:20:28 +00002865 unsigned Length = PredefinedExpr::ComputeName(IT, currentDecl).length();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002866
Anders Carlsson773f3972009-09-11 01:22:35 +00002867 llvm::APInt LengthI(32, Length + 1);
John McCall0953e762009-09-24 19:53:00 +00002868 ResTy = Context.CharTy.withConst();
Anders Carlsson773f3972009-09-11 01:22:35 +00002869 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0);
2870 }
Steve Naroff6ece14c2009-01-21 00:14:39 +00002871 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT));
Reid Spencer5f016e22007-07-11 17:01:13 +00002872}
2873
John McCall60d7b3a2010-08-24 06:29:42 +00002874ExprResult Sema::ActOnCharacterConstant(const Token &Tok) {
Reid Spencer5f016e22007-07-11 17:01:13 +00002875 llvm::SmallString<16> CharBuffer;
Douglas Gregor453091c2010-03-16 22:30:13 +00002876 bool Invalid = false;
2877 llvm::StringRef ThisTok = PP.getSpelling(Tok, CharBuffer, &Invalid);
2878 if (Invalid)
2879 return ExprError();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002880
Benjamin Kramerddeea562010-02-27 13:44:12 +00002881 CharLiteralParser Literal(ThisTok.begin(), ThisTok.end(), Tok.getLocation(),
2882 PP);
Reid Spencer5f016e22007-07-11 17:01:13 +00002883 if (Literal.hadError())
Sebastian Redlcd965b92009-01-18 18:53:16 +00002884 return ExprError();
Chris Lattnerfc62bfd2008-03-01 08:32:21 +00002885
Chris Lattnere8337df2009-12-30 21:19:39 +00002886 QualType Ty;
2887 if (!getLangOptions().CPlusPlus)
2888 Ty = Context.IntTy; // 'x' and L'x' -> int in C.
2889 else if (Literal.isWide())
2890 Ty = Context.WCharTy; // L'x' -> wchar_t in C++.
Eli Friedman136b0cd2010-02-03 18:21:45 +00002891 else if (Literal.isMultiChar())
2892 Ty = Context.IntTy; // 'wxyz' -> int in C++.
Chris Lattnere8337df2009-12-30 21:19:39 +00002893 else
2894 Ty = Context.CharTy; // 'x' -> char in C++
Chris Lattnerfc62bfd2008-03-01 08:32:21 +00002895
Sebastian Redle91b3bc2009-01-20 22:23:13 +00002896 return Owned(new (Context) CharacterLiteral(Literal.getValue(),
2897 Literal.isWide(),
Chris Lattnere8337df2009-12-30 21:19:39 +00002898 Ty, Tok.getLocation()));
Reid Spencer5f016e22007-07-11 17:01:13 +00002899}
2900
John McCall60d7b3a2010-08-24 06:29:42 +00002901ExprResult Sema::ActOnNumericConstant(const Token &Tok) {
Sebastian Redlcd965b92009-01-18 18:53:16 +00002902 // Fast path for a single digit (which is quite common). A single digit
Reid Spencer5f016e22007-07-11 17:01:13 +00002903 // cannot have a trigraph, escaped newline, radix prefix, or type suffix.
2904 if (Tok.getLength() == 1) {
Chris Lattner7216dc92009-01-26 22:36:52 +00002905 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok);
Chris Lattner0c21e842009-01-16 07:10:29 +00002906 unsigned IntSize = Context.Target.getIntWidth();
Argyrios Kyrtzidis9996a7f2010-08-28 09:06:06 +00002907 return Owned(IntegerLiteral::Create(Context, llvm::APInt(IntSize, Val-'0'),
Steve Naroff0a473932009-01-20 19:53:53 +00002908 Context.IntTy, Tok.getLocation()));
Reid Spencer5f016e22007-07-11 17:01:13 +00002909 }
Ted Kremenek28396602009-01-13 23:19:12 +00002910
Reid Spencer5f016e22007-07-11 17:01:13 +00002911 llvm::SmallString<512> IntegerBuffer;
Chris Lattner2a299042008-09-30 20:53:45 +00002912 // Add padding so that NumericLiteralParser can overread by one character.
2913 IntegerBuffer.resize(Tok.getLength()+1);
Reid Spencer5f016e22007-07-11 17:01:13 +00002914 const char *ThisTokBegin = &IntegerBuffer[0];
Sebastian Redlcd965b92009-01-18 18:53:16 +00002915
Reid Spencer5f016e22007-07-11 17:01:13 +00002916 // Get the spelling of the token, which eliminates trigraphs, etc.
Douglas Gregor453091c2010-03-16 22:30:13 +00002917 bool Invalid = false;
2918 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin, &Invalid);
2919 if (Invalid)
2920 return ExprError();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002921
Mike Stump1eb44332009-09-09 15:08:12 +00002922 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength,
Reid Spencer5f016e22007-07-11 17:01:13 +00002923 Tok.getLocation(), PP);
2924 if (Literal.hadError)
Sebastian Redlcd965b92009-01-18 18:53:16 +00002925 return ExprError();
2926
Chris Lattner5d661452007-08-26 03:42:43 +00002927 Expr *Res;
Sebastian Redlcd965b92009-01-18 18:53:16 +00002928
Chris Lattner5d661452007-08-26 03:42:43 +00002929 if (Literal.isFloatingLiteral()) {
Chris Lattner525a0502007-09-22 18:29:59 +00002930 QualType Ty;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002931 if (Literal.isFloat)
Chris Lattner525a0502007-09-22 18:29:59 +00002932 Ty = Context.FloatTy;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002933 else if (!Literal.isLong)
Chris Lattner525a0502007-09-22 18:29:59 +00002934 Ty = Context.DoubleTy;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002935 else
Chris Lattner9e9b6dc2008-03-08 08:52:55 +00002936 Ty = Context.LongDoubleTy;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002937
2938 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty);
2939
John McCall94c939d2009-12-24 09:08:04 +00002940 using llvm::APFloat;
2941 APFloat Val(Format);
2942
2943 APFloat::opStatus result = Literal.GetFloatValue(Val);
John McCall9f2df882009-12-24 11:09:08 +00002944
2945 // Overflow is always an error, but underflow is only an error if
2946 // we underflowed to zero (APFloat reports denormals as underflow).
2947 if ((result & APFloat::opOverflow) ||
2948 ((result & APFloat::opUnderflow) && Val.isZero())) {
John McCall94c939d2009-12-24 09:08:04 +00002949 unsigned diagnostic;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002950 llvm::SmallString<20> buffer;
John McCall94c939d2009-12-24 09:08:04 +00002951 if (result & APFloat::opOverflow) {
John McCall2a0d7572010-02-26 23:35:57 +00002952 diagnostic = diag::warn_float_overflow;
John McCall94c939d2009-12-24 09:08:04 +00002953 APFloat::getLargest(Format).toString(buffer);
2954 } else {
John McCall2a0d7572010-02-26 23:35:57 +00002955 diagnostic = diag::warn_float_underflow;
John McCall94c939d2009-12-24 09:08:04 +00002956 APFloat::getSmallest(Format).toString(buffer);
2957 }
2958
2959 Diag(Tok.getLocation(), diagnostic)
2960 << Ty
2961 << llvm::StringRef(buffer.data(), buffer.size());
2962 }
2963
2964 bool isExact = (result == APFloat::opOK);
Argyrios Kyrtzidis9996a7f2010-08-28 09:06:06 +00002965 Res = FloatingLiteral::Create(Context, Val, isExact, Ty, Tok.getLocation());
Sebastian Redlcd965b92009-01-18 18:53:16 +00002966
Peter Collingbournef4f7cb82011-03-11 19:24:59 +00002967 if (Ty == Context.DoubleTy) {
2968 if (getLangOptions().SinglePrecisionConstants) {
John Wiegley429bb272011-04-08 18:41:53 +00002969 Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).take();
Peter Collingbournef4f7cb82011-03-11 19:24:59 +00002970 } else if (getLangOptions().OpenCL && !getOpenCLOptions().cl_khr_fp64) {
2971 Diag(Tok.getLocation(), diag::warn_double_const_requires_fp64);
John Wiegley429bb272011-04-08 18:41:53 +00002972 Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).take();
Peter Collingbournef4f7cb82011-03-11 19:24:59 +00002973 }
2974 }
Chris Lattner5d661452007-08-26 03:42:43 +00002975 } else if (!Literal.isIntegerLiteral()) {
Sebastian Redlcd965b92009-01-18 18:53:16 +00002976 return ExprError();
Chris Lattner5d661452007-08-26 03:42:43 +00002977 } else {
Chris Lattnerf0467b32008-04-02 04:24:33 +00002978 QualType Ty;
Reid Spencer5f016e22007-07-11 17:01:13 +00002979
Neil Boothb9449512007-08-29 22:00:19 +00002980 // long long is a C99 feature.
2981 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x &&
Neil Booth79859c32007-08-29 22:13:52 +00002982 Literal.isLongLong)
Neil Boothb9449512007-08-29 22:00:19 +00002983 Diag(Tok.getLocation(), diag::ext_longlong);
2984
Reid Spencer5f016e22007-07-11 17:01:13 +00002985 // Get the value in the widest-possible width.
Chris Lattner98be4942008-03-05 18:54:05 +00002986 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0);
Sebastian Redlcd965b92009-01-18 18:53:16 +00002987
Reid Spencer5f016e22007-07-11 17:01:13 +00002988 if (Literal.GetIntegerValue(ResultVal)) {
2989 // If this value didn't fit into uintmax_t, warn and force to ull.
2990 Diag(Tok.getLocation(), diag::warn_integer_too_large);
Chris Lattnerf0467b32008-04-02 04:24:33 +00002991 Ty = Context.UnsignedLongLongTy;
2992 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() &&
Chris Lattner98be4942008-03-05 18:54:05 +00002993 "long long is not intmax_t?");
Reid Spencer5f016e22007-07-11 17:01:13 +00002994 } else {
2995 // If this value fits into a ULL, try to figure out what else it fits into
2996 // according to the rules of C99 6.4.4.1p5.
Sebastian Redlcd965b92009-01-18 18:53:16 +00002997
Reid Spencer5f016e22007-07-11 17:01:13 +00002998 // Octal, Hexadecimal, and integers with a U suffix are allowed to
2999 // be an unsigned int.
3000 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10;
3001
3002 // Check from smallest to largest, picking the smallest type we can.
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00003003 unsigned Width = 0;
Chris Lattner97c51562007-08-23 21:58:08 +00003004 if (!Literal.isLong && !Literal.isLongLong) {
3005 // Are int/unsigned possibilities?
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00003006 unsigned IntSize = Context.Target.getIntWidth();
Sebastian Redlcd965b92009-01-18 18:53:16 +00003007
Reid Spencer5f016e22007-07-11 17:01:13 +00003008 // Does it fit in a unsigned int?
3009 if (ResultVal.isIntN(IntSize)) {
3010 // Does it fit in a signed int?
3011 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0)
Chris Lattnerf0467b32008-04-02 04:24:33 +00003012 Ty = Context.IntTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00003013 else if (AllowUnsigned)
Chris Lattnerf0467b32008-04-02 04:24:33 +00003014 Ty = Context.UnsignedIntTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00003015 Width = IntSize;
Reid Spencer5f016e22007-07-11 17:01:13 +00003016 }
Reid Spencer5f016e22007-07-11 17:01:13 +00003017 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00003018
Reid Spencer5f016e22007-07-11 17:01:13 +00003019 // Are long/unsigned long possibilities?
Chris Lattnerf0467b32008-04-02 04:24:33 +00003020 if (Ty.isNull() && !Literal.isLongLong) {
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00003021 unsigned LongSize = Context.Target.getLongWidth();
Sebastian Redlcd965b92009-01-18 18:53:16 +00003022
Reid Spencer5f016e22007-07-11 17:01:13 +00003023 // Does it fit in a unsigned long?
3024 if (ResultVal.isIntN(LongSize)) {
3025 // Does it fit in a signed long?
3026 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0)
Chris Lattnerf0467b32008-04-02 04:24:33 +00003027 Ty = Context.LongTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00003028 else if (AllowUnsigned)
Chris Lattnerf0467b32008-04-02 04:24:33 +00003029 Ty = Context.UnsignedLongTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00003030 Width = LongSize;
Reid Spencer5f016e22007-07-11 17:01:13 +00003031 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00003032 }
3033
Reid Spencer5f016e22007-07-11 17:01:13 +00003034 // Finally, check long long if needed.
Chris Lattnerf0467b32008-04-02 04:24:33 +00003035 if (Ty.isNull()) {
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00003036 unsigned LongLongSize = Context.Target.getLongLongWidth();
Sebastian Redlcd965b92009-01-18 18:53:16 +00003037
Reid Spencer5f016e22007-07-11 17:01:13 +00003038 // Does it fit in a unsigned long long?
3039 if (ResultVal.isIntN(LongLongSize)) {
3040 // Does it fit in a signed long long?
Francois Pichet24323202011-01-11 23:38:13 +00003041 // To be compatible with MSVC, hex integer literals ending with the
3042 // LL or i64 suffix are always signed in Microsoft mode.
Francois Picheta15a5ee2011-01-11 12:23:00 +00003043 if (!Literal.isUnsigned && (ResultVal[LongLongSize-1] == 0 ||
3044 (getLangOptions().Microsoft && Literal.isLongLong)))
Chris Lattnerf0467b32008-04-02 04:24:33 +00003045 Ty = Context.LongLongTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00003046 else if (AllowUnsigned)
Chris Lattnerf0467b32008-04-02 04:24:33 +00003047 Ty = Context.UnsignedLongLongTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00003048 Width = LongLongSize;
Reid Spencer5f016e22007-07-11 17:01:13 +00003049 }
3050 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00003051
Reid Spencer5f016e22007-07-11 17:01:13 +00003052 // If we still couldn't decide a type, we probably have something that
3053 // does not fit in a signed long long, but has no U suffix.
Chris Lattnerf0467b32008-04-02 04:24:33 +00003054 if (Ty.isNull()) {
Reid Spencer5f016e22007-07-11 17:01:13 +00003055 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed);
Chris Lattnerf0467b32008-04-02 04:24:33 +00003056 Ty = Context.UnsignedLongLongTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00003057 Width = Context.Target.getLongLongWidth();
Reid Spencer5f016e22007-07-11 17:01:13 +00003058 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00003059
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00003060 if (ResultVal.getBitWidth() != Width)
Jay Foad9f71a8f2010-12-07 08:25:34 +00003061 ResultVal = ResultVal.trunc(Width);
Reid Spencer5f016e22007-07-11 17:01:13 +00003062 }
Argyrios Kyrtzidis9996a7f2010-08-28 09:06:06 +00003063 Res = IntegerLiteral::Create(Context, ResultVal, Ty, Tok.getLocation());
Reid Spencer5f016e22007-07-11 17:01:13 +00003064 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00003065
Chris Lattner5d661452007-08-26 03:42:43 +00003066 // If this is an imaginary literal, create the ImaginaryLiteral wrapper.
3067 if (Literal.isImaginary)
Mike Stump1eb44332009-09-09 15:08:12 +00003068 Res = new (Context) ImaginaryLiteral(Res,
Steve Naroff6ece14c2009-01-21 00:14:39 +00003069 Context.getComplexType(Res->getType()));
Sebastian Redlcd965b92009-01-18 18:53:16 +00003070
3071 return Owned(Res);
Reid Spencer5f016e22007-07-11 17:01:13 +00003072}
3073
John McCall60d7b3a2010-08-24 06:29:42 +00003074ExprResult Sema::ActOnParenExpr(SourceLocation L,
John McCall9ae2f072010-08-23 23:25:46 +00003075 SourceLocation R, Expr *E) {
Chris Lattnerf0467b32008-04-02 04:24:33 +00003076 assert((E != 0) && "ActOnParenExpr() missing expr");
Steve Naroff6ece14c2009-01-21 00:14:39 +00003077 return Owned(new (Context) ParenExpr(L, R, E));
Reid Spencer5f016e22007-07-11 17:01:13 +00003078}
3079
Chandler Carruthdf1f3772011-05-26 08:53:12 +00003080static bool CheckVecStepTraitOperandType(Sema &S, QualType T,
3081 SourceLocation Loc,
3082 SourceRange ArgRange) {
3083 // [OpenCL 1.1 6.11.12] "The vec_step built-in function takes a built-in
3084 // scalar or vector data type argument..."
3085 // Every built-in scalar type (OpenCL 1.1 6.1.1) is either an arithmetic
3086 // type (C99 6.2.5p18) or void.
3087 if (!(T->isArithmeticType() || T->isVoidType() || T->isVectorType())) {
3088 S.Diag(Loc, diag::err_vecstep_non_scalar_vector_type)
3089 << T << ArgRange;
3090 return true;
3091 }
3092
3093 assert((T->isVoidType() || !T->isIncompleteType()) &&
3094 "Scalar types should always be complete");
3095 return false;
3096}
3097
Chandler Carruth42ec65d2011-05-26 08:53:16 +00003098static bool CheckExtensionTraitOperandType(Sema &S, QualType T,
3099 SourceLocation Loc,
3100 SourceRange ArgRange,
3101 UnaryExprOrTypeTrait TraitKind) {
3102 // C99 6.5.3.4p1:
3103 if (T->isFunctionType()) {
3104 // alignof(function) is allowed as an extension.
3105 if (TraitKind == UETT_SizeOf)
3106 S.Diag(Loc, diag::ext_sizeof_function_type) << ArgRange;
3107 return false;
3108 }
3109
3110 // Allow sizeof(void)/alignof(void) as an extension.
3111 if (T->isVoidType()) {
3112 S.Diag(Loc, diag::ext_sizeof_void_type) << TraitKind << ArgRange;
3113 return false;
3114 }
3115
3116 return true;
3117}
3118
3119static bool CheckObjCTraitOperandConstraints(Sema &S, QualType T,
3120 SourceLocation Loc,
3121 SourceRange ArgRange,
3122 UnaryExprOrTypeTrait TraitKind) {
3123 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode.
3124 if (S.LangOpts.ObjCNonFragileABI && T->isObjCObjectType()) {
3125 S.Diag(Loc, diag::err_sizeof_nonfragile_interface)
3126 << T << (TraitKind == UETT_SizeOf)
3127 << ArgRange;
3128 return true;
3129 }
3130
3131 return false;
3132}
3133
Chandler Carruth9d342d02011-05-26 08:53:10 +00003134/// \brief Check the constrains on expression operands to unary type expression
3135/// and type traits.
3136///
Chandler Carruthe4d645c2011-05-27 01:33:31 +00003137/// Completes any types necessary and validates the constraints on the operand
3138/// expression. The logic mostly mirrors the type-based overload, but may modify
3139/// the expression as it completes the type for that expression through template
3140/// instantiation, etc.
Chandler Carruth9d342d02011-05-26 08:53:10 +00003141bool Sema::CheckUnaryExprOrTypeTraitOperand(Expr *Op,
3142 UnaryExprOrTypeTrait ExprKind) {
Chandler Carruthe4d645c2011-05-27 01:33:31 +00003143 QualType ExprTy = Op->getType();
3144
3145 // C++ [expr.sizeof]p2: "When applied to a reference or a reference type,
3146 // the result is the size of the referenced type."
3147 // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the
3148 // result shall be the alignment of the referenced type."
3149 if (const ReferenceType *Ref = ExprTy->getAs<ReferenceType>())
3150 ExprTy = Ref->getPointeeType();
3151
3152 if (ExprKind == UETT_VecStep)
3153 return CheckVecStepTraitOperandType(*this, ExprTy, Op->getExprLoc(),
3154 Op->getSourceRange());
3155
3156 // Whitelist some types as extensions
3157 if (!CheckExtensionTraitOperandType(*this, ExprTy, Op->getExprLoc(),
3158 Op->getSourceRange(), ExprKind))
3159 return false;
3160
3161 if (RequireCompleteExprType(Op,
3162 PDiag(diag::err_sizeof_alignof_incomplete_type)
3163 << ExprKind << Op->getSourceRange(),
3164 std::make_pair(SourceLocation(), PDiag(0))))
3165 return true;
3166
3167 // Completeing the expression's type may have changed it.
3168 ExprTy = Op->getType();
3169 if (const ReferenceType *Ref = ExprTy->getAs<ReferenceType>())
3170 ExprTy = Ref->getPointeeType();
3171
3172 if (CheckObjCTraitOperandConstraints(*this, ExprTy, Op->getExprLoc(),
3173 Op->getSourceRange(), ExprKind))
3174 return true;
3175
Nico Webercf739922011-06-15 02:47:03 +00003176 if (ExprKind == UETT_SizeOf) {
3177 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(Op->IgnoreParens())) {
3178 if (ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(DeclRef->getFoundDecl())) {
3179 QualType OType = PVD->getOriginalType();
3180 QualType Type = PVD->getType();
3181 if (Type->isPointerType() && OType->isArrayType()) {
3182 Diag(Op->getExprLoc(), diag::warn_sizeof_array_param)
3183 << Type << OType;
3184 Diag(PVD->getLocation(), diag::note_declared_at);
3185 }
3186 }
3187 }
3188 }
3189
Chandler Carruthe4d645c2011-05-27 01:33:31 +00003190 return false;
Chandler Carruth9d342d02011-05-26 08:53:10 +00003191}
3192
3193/// \brief Check the constraints on operands to unary expression and type
3194/// traits.
3195///
3196/// This will complete any types necessary, and validate the various constraints
3197/// on those operands.
3198///
Reid Spencer5f016e22007-07-11 17:01:13 +00003199/// The UsualUnaryConversions() function is *not* called by this routine.
Chandler Carruth9d342d02011-05-26 08:53:10 +00003200/// C99 6.3.2.1p[2-4] all state:
3201/// Except when it is the operand of the sizeof operator ...
3202///
3203/// C++ [expr.sizeof]p4
3204/// The lvalue-to-rvalue, array-to-pointer, and function-to-pointer
3205/// standard conversions are not applied to the operand of sizeof.
3206///
3207/// This policy is followed for all of the unary trait expressions.
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003208bool Sema::CheckUnaryExprOrTypeTraitOperand(QualType exprType,
3209 SourceLocation OpLoc,
3210 SourceRange ExprRange,
3211 UnaryExprOrTypeTrait ExprKind) {
Sebastian Redl28507842009-02-26 14:39:58 +00003212 if (exprType->isDependentType())
3213 return false;
3214
Sebastian Redl5d484e82009-11-23 17:18:46 +00003215 // C++ [expr.sizeof]p2: "When applied to a reference or a reference type,
3216 // the result is the size of the referenced type."
3217 // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the
3218 // result shall be the alignment of the referenced type."
3219 if (const ReferenceType *Ref = exprType->getAs<ReferenceType>())
3220 exprType = Ref->getPointeeType();
3221
Chandler Carruthdf1f3772011-05-26 08:53:12 +00003222 if (ExprKind == UETT_VecStep)
3223 return CheckVecStepTraitOperandType(*this, exprType, OpLoc, ExprRange);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003224
Chandler Carruth42ec65d2011-05-26 08:53:16 +00003225 // Whitelist some types as extensions
3226 if (!CheckExtensionTraitOperandType(*this, exprType, OpLoc, ExprRange,
3227 ExprKind))
Chris Lattner01072922009-01-24 19:46:37 +00003228 return false;
Mike Stump1eb44332009-09-09 15:08:12 +00003229
Chris Lattner1efaa952009-04-24 00:30:45 +00003230 if (RequireCompleteType(OpLoc, exprType,
Douglas Gregor5cc07df2009-12-15 16:44:32 +00003231 PDiag(diag::err_sizeof_alignof_incomplete_type)
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003232 << ExprKind << ExprRange))
Chris Lattner1efaa952009-04-24 00:30:45 +00003233 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00003234
Chandler Carruth42ec65d2011-05-26 08:53:16 +00003235 if (CheckObjCTraitOperandConstraints(*this, exprType, OpLoc, ExprRange,
3236 ExprKind))
Chris Lattner5cb10d32009-04-24 22:30:50 +00003237 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00003238
Chris Lattner1efaa952009-04-24 00:30:45 +00003239 return false;
Reid Spencer5f016e22007-07-11 17:01:13 +00003240}
3241
Chandler Carruth9d342d02011-05-26 08:53:10 +00003242static bool CheckAlignOfExpr(Sema &S, Expr *E) {
Chris Lattner31e21e02009-01-24 20:17:12 +00003243 E = E->IgnoreParens();
Sebastian Redl28507842009-02-26 14:39:58 +00003244
Mike Stump1eb44332009-09-09 15:08:12 +00003245 // alignof decl is always ok.
Chris Lattner31e21e02009-01-24 20:17:12 +00003246 if (isa<DeclRefExpr>(E))
3247 return false;
Sebastian Redl28507842009-02-26 14:39:58 +00003248
3249 // Cannot know anything else if the expression is dependent.
3250 if (E->isTypeDependent())
3251 return false;
3252
Douglas Gregor33bbbc52009-05-02 02:18:30 +00003253 if (E->getBitField()) {
Chandler Carruth9d342d02011-05-26 08:53:10 +00003254 S.Diag(E->getExprLoc(), diag::err_sizeof_alignof_bitfield)
3255 << 1 << E->getSourceRange();
Douglas Gregor33bbbc52009-05-02 02:18:30 +00003256 return true;
Chris Lattner31e21e02009-01-24 20:17:12 +00003257 }
Douglas Gregor33bbbc52009-05-02 02:18:30 +00003258
3259 // Alignment of a field access is always okay, so long as it isn't a
3260 // bit-field.
3261 if (MemberExpr *ME = dyn_cast<MemberExpr>(E))
Mike Stump8e1fab22009-07-22 18:58:19 +00003262 if (isa<FieldDecl>(ME->getMemberDecl()))
Douglas Gregor33bbbc52009-05-02 02:18:30 +00003263 return false;
3264
Chandler Carruth9d342d02011-05-26 08:53:10 +00003265 return S.CheckUnaryExprOrTypeTraitOperand(E, UETT_AlignOf);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003266}
3267
Chandler Carruth9d342d02011-05-26 08:53:10 +00003268bool Sema::CheckVecStepExpr(Expr *E) {
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003269 E = E->IgnoreParens();
3270
3271 // Cannot know anything else if the expression is dependent.
3272 if (E->isTypeDependent())
3273 return false;
3274
Chandler Carruth9d342d02011-05-26 08:53:10 +00003275 return CheckUnaryExprOrTypeTraitOperand(E, UETT_VecStep);
Chris Lattner31e21e02009-01-24 20:17:12 +00003276}
3277
Douglas Gregorba498172009-03-13 21:01:28 +00003278/// \brief Build a sizeof or alignof expression given a type operand.
John McCall60d7b3a2010-08-24 06:29:42 +00003279ExprResult
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003280Sema::CreateUnaryExprOrTypeTraitExpr(TypeSourceInfo *TInfo,
3281 SourceLocation OpLoc,
3282 UnaryExprOrTypeTrait ExprKind,
3283 SourceRange R) {
John McCalla93c9342009-12-07 02:54:59 +00003284 if (!TInfo)
Douglas Gregorba498172009-03-13 21:01:28 +00003285 return ExprError();
3286
John McCalla93c9342009-12-07 02:54:59 +00003287 QualType T = TInfo->getType();
John McCall5ab75172009-11-04 07:28:41 +00003288
Douglas Gregorba498172009-03-13 21:01:28 +00003289 if (!T->isDependentType() &&
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003290 CheckUnaryExprOrTypeTraitOperand(T, OpLoc, R, ExprKind))
Douglas Gregorba498172009-03-13 21:01:28 +00003291 return ExprError();
3292
3293 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003294 return Owned(new (Context) UnaryExprOrTypeTraitExpr(ExprKind, TInfo,
3295 Context.getSizeType(),
3296 OpLoc, R.getEnd()));
Douglas Gregorba498172009-03-13 21:01:28 +00003297}
3298
3299/// \brief Build a sizeof or alignof expression given an expression
3300/// operand.
John McCall60d7b3a2010-08-24 06:29:42 +00003301ExprResult
Chandler Carruthe72c55b2011-05-29 07:32:14 +00003302Sema::CreateUnaryExprOrTypeTraitExpr(Expr *E, SourceLocation OpLoc,
3303 UnaryExprOrTypeTrait ExprKind) {
Douglas Gregor4f0845e2011-06-22 23:21:00 +00003304 ExprResult PE = CheckPlaceholderExpr(E);
3305 if (PE.isInvalid())
3306 return ExprError();
3307
3308 E = PE.get();
3309
Douglas Gregorba498172009-03-13 21:01:28 +00003310 // Verify that the operand is valid.
3311 bool isInvalid = false;
3312 if (E->isTypeDependent()) {
3313 // Delay type-checking for type-dependent expressions.
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003314 } else if (ExprKind == UETT_AlignOf) {
Chandler Carruth9d342d02011-05-26 08:53:10 +00003315 isInvalid = CheckAlignOfExpr(*this, E);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003316 } else if (ExprKind == UETT_VecStep) {
Chandler Carruth9d342d02011-05-26 08:53:10 +00003317 isInvalid = CheckVecStepExpr(E);
Douglas Gregor33bbbc52009-05-02 02:18:30 +00003318 } else if (E->getBitField()) { // C99 6.5.3.4p1.
Chandler Carruth9d342d02011-05-26 08:53:10 +00003319 Diag(E->getExprLoc(), diag::err_sizeof_alignof_bitfield) << 0;
Douglas Gregorba498172009-03-13 21:01:28 +00003320 isInvalid = true;
3321 } else {
Chandler Carruth9d342d02011-05-26 08:53:10 +00003322 isInvalid = CheckUnaryExprOrTypeTraitOperand(E, UETT_SizeOf);
Douglas Gregorba498172009-03-13 21:01:28 +00003323 }
3324
3325 if (isInvalid)
3326 return ExprError();
3327
3328 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
Chandler Carruth9d342d02011-05-26 08:53:10 +00003329 return Owned(new (Context) UnaryExprOrTypeTraitExpr(
Chandler Carruthe72c55b2011-05-29 07:32:14 +00003330 ExprKind, E, Context.getSizeType(), OpLoc,
Chandler Carruth9d342d02011-05-26 08:53:10 +00003331 E->getSourceRange().getEnd()));
Douglas Gregorba498172009-03-13 21:01:28 +00003332}
3333
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003334/// ActOnUnaryExprOrTypeTraitExpr - Handle @c sizeof(type) and @c sizeof @c
3335/// expr and the same for @c alignof and @c __alignof
Sebastian Redl05189992008-11-11 17:56:53 +00003336/// Note that the ArgRange is invalid if isType is false.
John McCall60d7b3a2010-08-24 06:29:42 +00003337ExprResult
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003338Sema::ActOnUnaryExprOrTypeTraitExpr(SourceLocation OpLoc,
3339 UnaryExprOrTypeTrait ExprKind, bool isType,
3340 void *TyOrEx, const SourceRange &ArgRange) {
Reid Spencer5f016e22007-07-11 17:01:13 +00003341 // If error parsing type, ignore.
Sebastian Redl0eb23302009-01-19 00:08:26 +00003342 if (TyOrEx == 0) return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00003343
Sebastian Redl05189992008-11-11 17:56:53 +00003344 if (isType) {
John McCalla93c9342009-12-07 02:54:59 +00003345 TypeSourceInfo *TInfo;
John McCallb3d87482010-08-24 05:47:05 +00003346 (void) GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrEx), &TInfo);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003347 return CreateUnaryExprOrTypeTraitExpr(TInfo, OpLoc, ExprKind, ArgRange);
Mike Stump1eb44332009-09-09 15:08:12 +00003348 }
Sebastian Redl05189992008-11-11 17:56:53 +00003349
Douglas Gregorba498172009-03-13 21:01:28 +00003350 Expr *ArgEx = (Expr *)TyOrEx;
Chandler Carruthe72c55b2011-05-29 07:32:14 +00003351 ExprResult Result = CreateUnaryExprOrTypeTraitExpr(ArgEx, OpLoc, ExprKind);
Douglas Gregorba498172009-03-13 21:01:28 +00003352 return move(Result);
Reid Spencer5f016e22007-07-11 17:01:13 +00003353}
3354
John Wiegley429bb272011-04-08 18:41:53 +00003355static QualType CheckRealImagOperand(Sema &S, ExprResult &V, SourceLocation Loc,
John McCall09431682010-11-18 19:01:18 +00003356 bool isReal) {
John Wiegley429bb272011-04-08 18:41:53 +00003357 if (V.get()->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00003358 return S.Context.DependentTy;
Mike Stump1eb44332009-09-09 15:08:12 +00003359
John McCallf6a16482010-12-04 03:47:34 +00003360 // _Real and _Imag are only l-values for normal l-values.
John Wiegley429bb272011-04-08 18:41:53 +00003361 if (V.get()->getObjectKind() != OK_Ordinary) {
3362 V = S.DefaultLvalueConversion(V.take());
3363 if (V.isInvalid())
3364 return QualType();
3365 }
John McCallf6a16482010-12-04 03:47:34 +00003366
Chris Lattnercc26ed72007-08-26 05:39:26 +00003367 // These operators return the element type of a complex type.
John Wiegley429bb272011-04-08 18:41:53 +00003368 if (const ComplexType *CT = V.get()->getType()->getAs<ComplexType>())
Chris Lattnerdbb36972007-08-24 21:16:53 +00003369 return CT->getElementType();
Mike Stump1eb44332009-09-09 15:08:12 +00003370
Chris Lattnercc26ed72007-08-26 05:39:26 +00003371 // Otherwise they pass through real integer and floating point types here.
John Wiegley429bb272011-04-08 18:41:53 +00003372 if (V.get()->getType()->isArithmeticType())
3373 return V.get()->getType();
Mike Stump1eb44332009-09-09 15:08:12 +00003374
John McCall2cd11fe2010-10-12 02:09:17 +00003375 // Test for placeholders.
John McCallfb8721c2011-04-10 19:13:55 +00003376 ExprResult PR = S.CheckPlaceholderExpr(V.get());
John McCall2cd11fe2010-10-12 02:09:17 +00003377 if (PR.isInvalid()) return QualType();
John Wiegley429bb272011-04-08 18:41:53 +00003378 if (PR.get() != V.get()) {
3379 V = move(PR);
John McCall09431682010-11-18 19:01:18 +00003380 return CheckRealImagOperand(S, V, Loc, isReal);
John McCall2cd11fe2010-10-12 02:09:17 +00003381 }
3382
Chris Lattnercc26ed72007-08-26 05:39:26 +00003383 // Reject anything else.
John Wiegley429bb272011-04-08 18:41:53 +00003384 S.Diag(Loc, diag::err_realimag_invalid_type) << V.get()->getType()
Chris Lattnerba27e2a2009-02-17 08:12:06 +00003385 << (isReal ? "__real" : "__imag");
Chris Lattnercc26ed72007-08-26 05:39:26 +00003386 return QualType();
Chris Lattnerdbb36972007-08-24 21:16:53 +00003387}
3388
3389
Reid Spencer5f016e22007-07-11 17:01:13 +00003390
John McCall60d7b3a2010-08-24 06:29:42 +00003391ExprResult
Sebastian Redl0eb23302009-01-19 00:08:26 +00003392Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc,
John McCall9ae2f072010-08-23 23:25:46 +00003393 tok::TokenKind Kind, Expr *Input) {
John McCall2de56d12010-08-25 11:45:40 +00003394 UnaryOperatorKind Opc;
Reid Spencer5f016e22007-07-11 17:01:13 +00003395 switch (Kind) {
3396 default: assert(0 && "Unknown unary op!");
John McCall2de56d12010-08-25 11:45:40 +00003397 case tok::plusplus: Opc = UO_PostInc; break;
3398 case tok::minusminus: Opc = UO_PostDec; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00003399 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00003400
John McCall9ae2f072010-08-23 23:25:46 +00003401 return BuildUnaryOp(S, OpLoc, Opc, Input);
Reid Spencer5f016e22007-07-11 17:01:13 +00003402}
3403
John McCall09431682010-11-18 19:01:18 +00003404/// Expressions of certain arbitrary types are forbidden by C from
3405/// having l-value type. These are:
3406/// - 'void', but not qualified void
3407/// - function types
3408///
3409/// The exact rule here is C99 6.3.2.1:
3410/// An lvalue is an expression with an object type or an incomplete
3411/// type other than void.
3412static bool IsCForbiddenLValueType(ASTContext &C, QualType T) {
3413 return ((T->isVoidType() && !T.hasQualifiers()) ||
3414 T->isFunctionType());
3415}
3416
John McCall60d7b3a2010-08-24 06:29:42 +00003417ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003418Sema::ActOnArraySubscriptExpr(Scope *S, Expr *Base, SourceLocation LLoc,
3419 Expr *Idx, SourceLocation RLoc) {
Nate Begeman2ef13e52009-08-10 23:49:36 +00003420 // Since this might be a postfix expression, get rid of ParenListExprs.
John McCall60d7b3a2010-08-24 06:29:42 +00003421 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base);
John McCall9ae2f072010-08-23 23:25:46 +00003422 if (Result.isInvalid()) return ExprError();
3423 Base = Result.take();
Nate Begeman2ef13e52009-08-10 23:49:36 +00003424
John McCall9ae2f072010-08-23 23:25:46 +00003425 Expr *LHSExp = Base, *RHSExp = Idx;
Mike Stump1eb44332009-09-09 15:08:12 +00003426
Douglas Gregor337c6b92008-11-19 17:17:41 +00003427 if (getLangOptions().CPlusPlus &&
Douglas Gregor3384c9c2009-05-19 00:01:19 +00003428 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) {
Douglas Gregor3384c9c2009-05-19 00:01:19 +00003429 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp,
John McCallf89e55a2010-11-18 06:31:45 +00003430 Context.DependentTy,
3431 VK_LValue, OK_Ordinary,
3432 RLoc));
Douglas Gregor3384c9c2009-05-19 00:01:19 +00003433 }
3434
Mike Stump1eb44332009-09-09 15:08:12 +00003435 if (getLangOptions().CPlusPlus &&
Sebastian Redl0eb23302009-01-19 00:08:26 +00003436 (LHSExp->getType()->isRecordType() ||
Eli Friedman03f332a2008-12-15 22:34:21 +00003437 LHSExp->getType()->isEnumeralType() ||
3438 RHSExp->getType()->isRecordType() ||
3439 RHSExp->getType()->isEnumeralType())) {
John McCall9ae2f072010-08-23 23:25:46 +00003440 return CreateOverloadedArraySubscriptExpr(LLoc, RLoc, Base, Idx);
Douglas Gregor337c6b92008-11-19 17:17:41 +00003441 }
3442
John McCall9ae2f072010-08-23 23:25:46 +00003443 return CreateBuiltinArraySubscriptExpr(Base, LLoc, Idx, RLoc);
Sebastian Redlf322ed62009-10-29 20:17:01 +00003444}
3445
3446
John McCall60d7b3a2010-08-24 06:29:42 +00003447ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003448Sema::CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc,
3449 Expr *Idx, SourceLocation RLoc) {
3450 Expr *LHSExp = Base;
3451 Expr *RHSExp = Idx;
Sebastian Redlf322ed62009-10-29 20:17:01 +00003452
Chris Lattner12d9ff62007-07-16 00:14:47 +00003453 // Perform default conversions.
John Wiegley429bb272011-04-08 18:41:53 +00003454 if (!LHSExp->getType()->getAs<VectorType>()) {
3455 ExprResult Result = DefaultFunctionArrayLvalueConversion(LHSExp);
3456 if (Result.isInvalid())
3457 return ExprError();
3458 LHSExp = Result.take();
3459 }
3460 ExprResult Result = DefaultFunctionArrayLvalueConversion(RHSExp);
3461 if (Result.isInvalid())
3462 return ExprError();
3463 RHSExp = Result.take();
Sebastian Redl0eb23302009-01-19 00:08:26 +00003464
Chris Lattner12d9ff62007-07-16 00:14:47 +00003465 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType();
John McCallf89e55a2010-11-18 06:31:45 +00003466 ExprValueKind VK = VK_LValue;
3467 ExprObjectKind OK = OK_Ordinary;
Reid Spencer5f016e22007-07-11 17:01:13 +00003468
Reid Spencer5f016e22007-07-11 17:01:13 +00003469 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent
Chris Lattner73d0d4f2007-08-30 17:45:32 +00003470 // to the expression *((e1)+(e2)). This means the array "Base" may actually be
Mike Stumpeed9cac2009-02-19 03:04:26 +00003471 // in the subscript position. As a result, we need to derive the array base
Reid Spencer5f016e22007-07-11 17:01:13 +00003472 // and index from the expression types.
Chris Lattner12d9ff62007-07-16 00:14:47 +00003473 Expr *BaseExpr, *IndexExpr;
3474 QualType ResultType;
Sebastian Redl28507842009-02-26 14:39:58 +00003475 if (LHSTy->isDependentType() || RHSTy->isDependentType()) {
3476 BaseExpr = LHSExp;
3477 IndexExpr = RHSExp;
3478 ResultType = Context.DependentTy;
Ted Kremenek6217b802009-07-29 21:53:49 +00003479 } else if (const PointerType *PTy = LHSTy->getAs<PointerType>()) {
Chris Lattner12d9ff62007-07-16 00:14:47 +00003480 BaseExpr = LHSExp;
3481 IndexExpr = RHSExp;
Chris Lattner12d9ff62007-07-16 00:14:47 +00003482 ResultType = PTy->getPointeeType();
Ted Kremenek6217b802009-07-29 21:53:49 +00003483 } else if (const PointerType *PTy = RHSTy->getAs<PointerType>()) {
Chris Lattner7a2e0472007-07-16 00:23:25 +00003484 // Handle the uncommon case of "123[Ptr]".
Chris Lattner12d9ff62007-07-16 00:14:47 +00003485 BaseExpr = RHSExp;
3486 IndexExpr = LHSExp;
Chris Lattner12d9ff62007-07-16 00:14:47 +00003487 ResultType = PTy->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00003488 } else if (const ObjCObjectPointerType *PTy =
John McCall183700f2009-09-21 23:43:11 +00003489 LHSTy->getAs<ObjCObjectPointerType>()) {
Steve Naroff14108da2009-07-10 23:34:53 +00003490 BaseExpr = LHSExp;
3491 IndexExpr = RHSExp;
3492 ResultType = PTy->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00003493 } else if (const ObjCObjectPointerType *PTy =
John McCall183700f2009-09-21 23:43:11 +00003494 RHSTy->getAs<ObjCObjectPointerType>()) {
Steve Naroff14108da2009-07-10 23:34:53 +00003495 // Handle the uncommon case of "123[Ptr]".
3496 BaseExpr = RHSExp;
3497 IndexExpr = LHSExp;
3498 ResultType = PTy->getPointeeType();
John McCall183700f2009-09-21 23:43:11 +00003499 } else if (const VectorType *VTy = LHSTy->getAs<VectorType>()) {
Chris Lattnerc8629632007-07-31 19:29:30 +00003500 BaseExpr = LHSExp; // vectors: V[123]
Chris Lattner12d9ff62007-07-16 00:14:47 +00003501 IndexExpr = RHSExp;
John McCallf89e55a2010-11-18 06:31:45 +00003502 VK = LHSExp->getValueKind();
3503 if (VK != VK_RValue)
3504 OK = OK_VectorComponent;
Nate Begeman334a8022009-01-18 00:45:31 +00003505
Chris Lattner12d9ff62007-07-16 00:14:47 +00003506 // FIXME: need to deal with const...
3507 ResultType = VTy->getElementType();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003508 } else if (LHSTy->isArrayType()) {
3509 // If we see an array that wasn't promoted by
Douglas Gregora873dfc2010-02-03 00:27:59 +00003510 // DefaultFunctionArrayLvalueConversion, it must be an array that
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003511 // wasn't promoted because of the C90 rule that doesn't
3512 // allow promoting non-lvalue arrays. Warn, then
3513 // force the promotion here.
3514 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) <<
3515 LHSExp->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00003516 LHSExp = ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy),
3517 CK_ArrayToPointerDecay).take();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003518 LHSTy = LHSExp->getType();
3519
3520 BaseExpr = LHSExp;
3521 IndexExpr = RHSExp;
Ted Kremenek6217b802009-07-29 21:53:49 +00003522 ResultType = LHSTy->getAs<PointerType>()->getPointeeType();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003523 } else if (RHSTy->isArrayType()) {
3524 // Same as previous, except for 123[f().a] case
3525 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) <<
3526 RHSExp->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00003527 RHSExp = ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy),
3528 CK_ArrayToPointerDecay).take();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003529 RHSTy = RHSExp->getType();
3530
3531 BaseExpr = RHSExp;
3532 IndexExpr = LHSExp;
Ted Kremenek6217b802009-07-29 21:53:49 +00003533 ResultType = RHSTy->getAs<PointerType>()->getPointeeType();
Reid Spencer5f016e22007-07-11 17:01:13 +00003534 } else {
Chris Lattner338395d2009-04-25 22:50:55 +00003535 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value)
3536 << LHSExp->getSourceRange() << RHSExp->getSourceRange());
Sebastian Redl0eb23302009-01-19 00:08:26 +00003537 }
Reid Spencer5f016e22007-07-11 17:01:13 +00003538 // C99 6.5.2.1p1
Douglas Gregorf6094622010-07-23 15:58:24 +00003539 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent())
Chris Lattner338395d2009-04-25 22:50:55 +00003540 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer)
3541 << IndexExpr->getSourceRange());
Reid Spencer5f016e22007-07-11 17:01:13 +00003542
Daniel Dunbar7e88a602009-09-17 06:31:17 +00003543 if ((IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
Sam Weinig0f9a5b52009-09-14 20:14:57 +00003544 IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
3545 && !IndexExpr->isTypeDependent())
Sam Weinig76e2b712009-09-14 01:58:58 +00003546 Diag(LLoc, diag::warn_subscript_is_char) << IndexExpr->getSourceRange();
3547
Douglas Gregore7450f52009-03-24 19:52:54 +00003548 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly,
Mike Stump1eb44332009-09-09 15:08:12 +00003549 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object
3550 // type. Note that Functions are not objects, and that (in C99 parlance)
Douglas Gregore7450f52009-03-24 19:52:54 +00003551 // incomplete types are not object types.
3552 if (ResultType->isFunctionType()) {
3553 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type)
3554 << ResultType << BaseExpr->getSourceRange();
3555 return ExprError();
3556 }
Mike Stump1eb44332009-09-09 15:08:12 +00003557
Abramo Bagnara46358452010-09-13 06:50:07 +00003558 if (ResultType->isVoidType() && !getLangOptions().CPlusPlus) {
3559 // GNU extension: subscripting on pointer to void
3560 Diag(LLoc, diag::ext_gnu_void_ptr)
3561 << BaseExpr->getSourceRange();
John McCall09431682010-11-18 19:01:18 +00003562
3563 // C forbids expressions of unqualified void type from being l-values.
3564 // See IsCForbiddenLValueType.
3565 if (!ResultType.hasQualifiers()) VK = VK_RValue;
Abramo Bagnara46358452010-09-13 06:50:07 +00003566 } else if (!ResultType->isDependentType() &&
Mike Stump1eb44332009-09-09 15:08:12 +00003567 RequireCompleteType(LLoc, ResultType,
Anders Carlssonb7906612009-08-26 23:45:07 +00003568 PDiag(diag::err_subscript_incomplete_type)
3569 << BaseExpr->getSourceRange()))
Douglas Gregore7450f52009-03-24 19:52:54 +00003570 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00003571
Chris Lattner1efaa952009-04-24 00:30:45 +00003572 // Diagnose bad cases where we step over interface counts.
John McCallc12c5bb2010-05-15 11:32:37 +00003573 if (ResultType->isObjCObjectType() && LangOpts.ObjCNonFragileABI) {
Chris Lattner1efaa952009-04-24 00:30:45 +00003574 Diag(LLoc, diag::err_subscript_nonfragile_interface)
3575 << ResultType << BaseExpr->getSourceRange();
3576 return ExprError();
3577 }
Mike Stump1eb44332009-09-09 15:08:12 +00003578
John McCall09431682010-11-18 19:01:18 +00003579 assert(VK == VK_RValue || LangOpts.CPlusPlus ||
3580 !IsCForbiddenLValueType(Context, ResultType));
3581
Mike Stumpeed9cac2009-02-19 03:04:26 +00003582 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp,
John McCallf89e55a2010-11-18 06:31:45 +00003583 ResultType, VK, OK, RLoc));
Reid Spencer5f016e22007-07-11 17:01:13 +00003584}
3585
John McCall09431682010-11-18 19:01:18 +00003586/// Check an ext-vector component access expression.
3587///
3588/// VK should be set in advance to the value kind of the base
3589/// expression.
3590static QualType
3591CheckExtVectorComponent(Sema &S, QualType baseType, ExprValueKind &VK,
3592 SourceLocation OpLoc, const IdentifierInfo *CompName,
Anders Carlsson8f28f992009-08-26 18:25:21 +00003593 SourceLocation CompLoc) {
Daniel Dunbar2ad32892009-10-18 02:09:38 +00003594 // FIXME: Share logic with ExtVectorElementExpr::containsDuplicateElements,
3595 // see FIXME there.
3596 //
3597 // FIXME: This logic can be greatly simplified by splitting it along
3598 // halving/not halving and reworking the component checking.
John McCall183700f2009-09-21 23:43:11 +00003599 const ExtVectorType *vecType = baseType->getAs<ExtVectorType>();
Nate Begeman8a997642008-05-09 06:41:27 +00003600
Steve Naroffe1b31fe2007-07-27 22:15:19 +00003601 // The vector accessor can't exceed the number of elements.
Daniel Dunbare013d682009-10-18 20:26:12 +00003602 const char *compStr = CompName->getNameStart();
Nate Begeman353417a2009-01-18 01:47:54 +00003603
Mike Stumpeed9cac2009-02-19 03:04:26 +00003604 // This flag determines whether or not the component is one of the four
Nate Begeman353417a2009-01-18 01:47:54 +00003605 // special names that indicate a subset of exactly half the elements are
3606 // to be selected.
3607 bool HalvingSwizzle = false;
Mike Stumpeed9cac2009-02-19 03:04:26 +00003608
Nate Begeman353417a2009-01-18 01:47:54 +00003609 // This flag determines whether or not CompName has an 's' char prefix,
3610 // indicating that it is a string of hex values to be used as vector indices.
Nate Begeman131f4652009-06-25 21:06:09 +00003611 bool HexSwizzle = *compStr == 's' || *compStr == 'S';
Nate Begeman8a997642008-05-09 06:41:27 +00003612
John McCall09431682010-11-18 19:01:18 +00003613 bool HasRepeated = false;
3614 bool HasIndex[16] = {};
3615
3616 int Idx;
3617
Nate Begeman8a997642008-05-09 06:41:27 +00003618 // Check that we've found one of the special components, or that the component
3619 // names must come from the same set.
Mike Stumpeed9cac2009-02-19 03:04:26 +00003620 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") ||
Nate Begeman353417a2009-01-18 01:47:54 +00003621 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) {
3622 HalvingSwizzle = true;
John McCall09431682010-11-18 19:01:18 +00003623 } else if (!HexSwizzle &&
3624 (Idx = vecType->getPointAccessorIdx(*compStr)) != -1) {
3625 do {
3626 if (HasIndex[Idx]) HasRepeated = true;
3627 HasIndex[Idx] = true;
Chris Lattner88dca042007-08-02 22:33:49 +00003628 compStr++;
John McCall09431682010-11-18 19:01:18 +00003629 } while (*compStr && (Idx = vecType->getPointAccessorIdx(*compStr)) != -1);
3630 } else {
3631 if (HexSwizzle) compStr++;
3632 while ((Idx = vecType->getNumericAccessorIdx(*compStr)) != -1) {
3633 if (HasIndex[Idx]) HasRepeated = true;
3634 HasIndex[Idx] = true;
Chris Lattner88dca042007-08-02 22:33:49 +00003635 compStr++;
John McCall09431682010-11-18 19:01:18 +00003636 }
Chris Lattner88dca042007-08-02 22:33:49 +00003637 }
Nate Begeman353417a2009-01-18 01:47:54 +00003638
Mike Stumpeed9cac2009-02-19 03:04:26 +00003639 if (!HalvingSwizzle && *compStr) {
Steve Naroffe1b31fe2007-07-27 22:15:19 +00003640 // We didn't get to the end of the string. This means the component names
3641 // didn't come from the same set *or* we encountered an illegal name.
John McCall09431682010-11-18 19:01:18 +00003642 S.Diag(OpLoc, diag::err_ext_vector_component_name_illegal)
Benjamin Kramer476d8b82010-08-11 14:47:12 +00003643 << llvm::StringRef(compStr, 1) << SourceRange(CompLoc);
Steve Naroffe1b31fe2007-07-27 22:15:19 +00003644 return QualType();
3645 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00003646
Nate Begeman353417a2009-01-18 01:47:54 +00003647 // Ensure no component accessor exceeds the width of the vector type it
3648 // operates on.
3649 if (!HalvingSwizzle) {
Daniel Dunbare013d682009-10-18 20:26:12 +00003650 compStr = CompName->getNameStart();
Nate Begeman353417a2009-01-18 01:47:54 +00003651
3652 if (HexSwizzle)
Steve Naroffe1b31fe2007-07-27 22:15:19 +00003653 compStr++;
Nate Begeman353417a2009-01-18 01:47:54 +00003654
3655 while (*compStr) {
3656 if (!vecType->isAccessorWithinNumElements(*compStr++)) {
John McCall09431682010-11-18 19:01:18 +00003657 S.Diag(OpLoc, diag::err_ext_vector_component_exceeds_length)
Nate Begeman353417a2009-01-18 01:47:54 +00003658 << baseType << SourceRange(CompLoc);
3659 return QualType();
3660 }
3661 }
Steve Naroffe1b31fe2007-07-27 22:15:19 +00003662 }
Nate Begeman8a997642008-05-09 06:41:27 +00003663
Steve Naroffe1b31fe2007-07-27 22:15:19 +00003664 // The component accessor looks fine - now we need to compute the actual type.
Mike Stumpeed9cac2009-02-19 03:04:26 +00003665 // The vector type is implied by the component accessor. For example,
Steve Naroffe1b31fe2007-07-27 22:15:19 +00003666 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc.
Nate Begeman353417a2009-01-18 01:47:54 +00003667 // vec4.s0 is a float, vec4.s23 is a vec3, etc.
Nate Begeman8a997642008-05-09 06:41:27 +00003668 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2.
Nate Begeman0479a0b2009-12-15 18:13:04 +00003669 unsigned CompSize = HalvingSwizzle ? (vecType->getNumElements() + 1) / 2
Anders Carlsson8f28f992009-08-26 18:25:21 +00003670 : CompName->getLength();
Nate Begeman353417a2009-01-18 01:47:54 +00003671 if (HexSwizzle)
3672 CompSize--;
3673
Steve Naroffe1b31fe2007-07-27 22:15:19 +00003674 if (CompSize == 1)
3675 return vecType->getElementType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00003676
John McCall09431682010-11-18 19:01:18 +00003677 if (HasRepeated) VK = VK_RValue;
3678
3679 QualType VT = S.Context.getExtVectorType(vecType->getElementType(), CompSize);
Mike Stumpeed9cac2009-02-19 03:04:26 +00003680 // Now look up the TypeDefDecl from the vector type. Without this,
Nate Begeman213541a2008-04-18 23:10:10 +00003681 // diagostics look bad. We want extended vector types to appear built-in.
John McCall09431682010-11-18 19:01:18 +00003682 for (unsigned i = 0, E = S.ExtVectorDecls.size(); i != E; ++i) {
3683 if (S.ExtVectorDecls[i]->getUnderlyingType() == VT)
3684 return S.Context.getTypedefType(S.ExtVectorDecls[i]);
Steve Naroffbea0b342007-07-29 16:33:31 +00003685 }
3686 return VT; // should never get here (a typedef type should always be found).
Steve Naroffe1b31fe2007-07-27 22:15:19 +00003687}
3688
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00003689static Decl *FindGetterSetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl,
Anders Carlsson8f28f992009-08-26 18:25:21 +00003690 IdentifierInfo *Member,
Douglas Gregor6ab35242009-04-09 21:40:53 +00003691 const Selector &Sel,
3692 ASTContext &Context) {
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00003693 if (Member)
3694 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Member))
3695 return PD;
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00003696 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel))
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00003697 return OMD;
Mike Stump1eb44332009-09-09 15:08:12 +00003698
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00003699 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(),
3700 E = PDecl->protocol_end(); I != E; ++I) {
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00003701 if (Decl *D = FindGetterSetterNameDeclFromProtocolList(*I, Member, Sel,
3702 Context))
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00003703 return D;
3704 }
3705 return 0;
3706}
3707
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00003708static Decl *FindGetterSetterNameDecl(const ObjCObjectPointerType *QIdTy,
3709 IdentifierInfo *Member,
3710 const Selector &Sel,
3711 ASTContext &Context) {
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00003712 // Check protocols on qualified interfaces.
3713 Decl *GDecl = 0;
Steve Naroffd1b3c2d2009-06-17 22:40:22 +00003714 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(),
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00003715 E = QIdTy->qual_end(); I != E; ++I) {
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00003716 if (Member)
3717 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) {
3718 GDecl = PD;
3719 break;
3720 }
3721 // Also must look for a getter or setter name which uses property syntax.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00003722 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) {
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00003723 GDecl = OMD;
3724 break;
3725 }
3726 }
3727 if (!GDecl) {
Steve Naroffd1b3c2d2009-06-17 22:40:22 +00003728 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(),
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00003729 E = QIdTy->qual_end(); I != E; ++I) {
3730 // Search in the protocol-qualifier list of current protocol.
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00003731 GDecl = FindGetterSetterNameDeclFromProtocolList(*I, Member, Sel,
3732 Context);
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00003733 if (GDecl)
3734 return GDecl;
3735 }
3736 }
3737 return GDecl;
3738}
Chris Lattner76a642f2009-02-15 22:43:40 +00003739
John McCall60d7b3a2010-08-24 06:29:42 +00003740ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003741Sema::ActOnDependentMemberExpr(Expr *BaseExpr, QualType BaseType,
John McCallaa81e162009-12-01 22:10:20 +00003742 bool IsArrow, SourceLocation OpLoc,
John McCall129e2df2009-11-30 22:42:35 +00003743 const CXXScopeSpec &SS,
3744 NamedDecl *FirstQualifierInScope,
Abramo Bagnara25777432010-08-11 22:01:17 +00003745 const DeclarationNameInfo &NameInfo,
John McCall129e2df2009-11-30 22:42:35 +00003746 const TemplateArgumentListInfo *TemplateArgs) {
John McCall129e2df2009-11-30 22:42:35 +00003747 // Even in dependent contexts, try to diagnose base expressions with
3748 // obviously wrong types, e.g.:
3749 //
3750 // T* t;
3751 // t.f;
3752 //
3753 // In Obj-C++, however, the above expression is valid, since it could be
3754 // accessing the 'f' property if T is an Obj-C interface. The extra check
3755 // allows this, while still reporting an error if T is a struct pointer.
3756 if (!IsArrow) {
John McCallaa81e162009-12-01 22:10:20 +00003757 const PointerType *PT = BaseType->getAs<PointerType>();
John McCall129e2df2009-11-30 22:42:35 +00003758 if (PT && (!getLangOptions().ObjC1 ||
3759 PT->getPointeeType()->isRecordType())) {
John McCallaa81e162009-12-01 22:10:20 +00003760 assert(BaseExpr && "cannot happen with implicit member accesses");
Abramo Bagnara25777432010-08-11 22:01:17 +00003761 Diag(NameInfo.getLoc(), diag::err_typecheck_member_reference_struct_union)
John McCallaa81e162009-12-01 22:10:20 +00003762 << BaseType << BaseExpr->getSourceRange();
John McCall129e2df2009-11-30 22:42:35 +00003763 return ExprError();
3764 }
3765 }
3766
Abramo Bagnara25777432010-08-11 22:01:17 +00003767 assert(BaseType->isDependentType() ||
3768 NameInfo.getName().isDependentName() ||
Douglas Gregor01e56ae2010-04-12 20:54:26 +00003769 isDependentScopeSpecifier(SS));
John McCall129e2df2009-11-30 22:42:35 +00003770
3771 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr
3772 // must have pointer type, and the accessed type is the pointee.
John McCallaa81e162009-12-01 22:10:20 +00003773 return Owned(CXXDependentScopeMemberExpr::Create(Context, BaseExpr, BaseType,
John McCall129e2df2009-11-30 22:42:35 +00003774 IsArrow, OpLoc,
Douglas Gregor7c3179c2011-02-28 18:50:33 +00003775 SS.getWithLocInContext(Context),
John McCall129e2df2009-11-30 22:42:35 +00003776 FirstQualifierInScope,
Abramo Bagnara25777432010-08-11 22:01:17 +00003777 NameInfo, TemplateArgs));
John McCall129e2df2009-11-30 22:42:35 +00003778}
3779
3780/// We know that the given qualified member reference points only to
3781/// declarations which do not belong to the static type of the base
3782/// expression. Diagnose the problem.
3783static void DiagnoseQualifiedMemberReference(Sema &SemaRef,
3784 Expr *BaseExpr,
3785 QualType BaseType,
John McCall2f841ba2009-12-02 03:53:29 +00003786 const CXXScopeSpec &SS,
John McCall5808ce42011-02-03 08:15:49 +00003787 NamedDecl *rep,
3788 const DeclarationNameInfo &nameInfo) {
John McCall2f841ba2009-12-02 03:53:29 +00003789 // If this is an implicit member access, use a different set of
3790 // diagnostics.
3791 if (!BaseExpr)
John McCall5808ce42011-02-03 08:15:49 +00003792 return DiagnoseInstanceReference(SemaRef, SS, rep, nameInfo);
John McCall129e2df2009-11-30 22:42:35 +00003793
John McCall5808ce42011-02-03 08:15:49 +00003794 SemaRef.Diag(nameInfo.getLoc(), diag::err_qualified_member_of_unrelated)
3795 << SS.getRange() << rep << BaseType;
John McCall129e2df2009-11-30 22:42:35 +00003796}
3797
3798// Check whether the declarations we found through a nested-name
3799// specifier in a member expression are actually members of the base
3800// type. The restriction here is:
3801//
3802// C++ [expr.ref]p2:
3803// ... In these cases, the id-expression shall name a
3804// member of the class or of one of its base classes.
3805//
3806// So it's perfectly legitimate for the nested-name specifier to name
3807// an unrelated class, and for us to find an overload set including
3808// decls from classes which are not superclasses, as long as the decl
3809// we actually pick through overload resolution is from a superclass.
3810bool Sema::CheckQualifiedMemberReference(Expr *BaseExpr,
3811 QualType BaseType,
John McCall2f841ba2009-12-02 03:53:29 +00003812 const CXXScopeSpec &SS,
John McCall129e2df2009-11-30 22:42:35 +00003813 const LookupResult &R) {
John McCallaa81e162009-12-01 22:10:20 +00003814 const RecordType *BaseRT = BaseType->getAs<RecordType>();
3815 if (!BaseRT) {
3816 // We can't check this yet because the base type is still
3817 // dependent.
3818 assert(BaseType->isDependentType());
3819 return false;
3820 }
3821 CXXRecordDecl *BaseRecord = cast<CXXRecordDecl>(BaseRT->getDecl());
John McCall129e2df2009-11-30 22:42:35 +00003822
3823 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
John McCallaa81e162009-12-01 22:10:20 +00003824 // If this is an implicit member reference and we find a
3825 // non-instance member, it's not an error.
John McCall161755a2010-04-06 21:38:20 +00003826 if (!BaseExpr && !(*I)->isCXXInstanceMember())
John McCallaa81e162009-12-01 22:10:20 +00003827 return false;
John McCall129e2df2009-11-30 22:42:35 +00003828
John McCallaa81e162009-12-01 22:10:20 +00003829 // Note that we use the DC of the decl, not the underlying decl.
Eli Friedman02463762010-07-27 20:51:02 +00003830 DeclContext *DC = (*I)->getDeclContext();
3831 while (DC->isTransparentContext())
3832 DC = DC->getParent();
John McCallaa81e162009-12-01 22:10:20 +00003833
Douglas Gregor9d4bb942010-07-28 22:27:52 +00003834 if (!DC->isRecord())
3835 continue;
3836
John McCallaa81e162009-12-01 22:10:20 +00003837 llvm::SmallPtrSet<CXXRecordDecl*,4> MemberRecord;
Eli Friedman02463762010-07-27 20:51:02 +00003838 MemberRecord.insert(cast<CXXRecordDecl>(DC)->getCanonicalDecl());
John McCallaa81e162009-12-01 22:10:20 +00003839
3840 if (!IsProvablyNotDerivedFrom(*this, BaseRecord, MemberRecord))
3841 return false;
3842 }
3843
John McCall5808ce42011-02-03 08:15:49 +00003844 DiagnoseQualifiedMemberReference(*this, BaseExpr, BaseType, SS,
3845 R.getRepresentativeDecl(),
3846 R.getLookupNameInfo());
John McCallaa81e162009-12-01 22:10:20 +00003847 return true;
3848}
3849
3850static bool
3851LookupMemberExprInRecord(Sema &SemaRef, LookupResult &R,
3852 SourceRange BaseRange, const RecordType *RTy,
John McCallad00b772010-06-16 08:42:20 +00003853 SourceLocation OpLoc, CXXScopeSpec &SS,
3854 bool HasTemplateArgs) {
John McCallaa81e162009-12-01 22:10:20 +00003855 RecordDecl *RDecl = RTy->getDecl();
3856 if (SemaRef.RequireCompleteType(OpLoc, QualType(RTy, 0),
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00003857 SemaRef.PDiag(diag::err_typecheck_incomplete_tag)
John McCallaa81e162009-12-01 22:10:20 +00003858 << BaseRange))
3859 return true;
3860
John McCallad00b772010-06-16 08:42:20 +00003861 if (HasTemplateArgs) {
3862 // LookupTemplateName doesn't expect these both to exist simultaneously.
3863 QualType ObjectType = SS.isSet() ? QualType() : QualType(RTy, 0);
3864
3865 bool MOUS;
3866 SemaRef.LookupTemplateName(R, 0, SS, ObjectType, false, MOUS);
3867 return false;
3868 }
3869
John McCallaa81e162009-12-01 22:10:20 +00003870 DeclContext *DC = RDecl;
3871 if (SS.isSet()) {
3872 // If the member name was a qualified-id, look into the
3873 // nested-name-specifier.
3874 DC = SemaRef.computeDeclContext(SS, false);
3875
John McCall77bb1aa2010-05-01 00:40:08 +00003876 if (SemaRef.RequireCompleteDeclContext(SS, DC)) {
John McCall2f841ba2009-12-02 03:53:29 +00003877 SemaRef.Diag(SS.getRange().getEnd(), diag::err_typecheck_incomplete_tag)
3878 << SS.getRange() << DC;
3879 return true;
3880 }
3881
John McCallaa81e162009-12-01 22:10:20 +00003882 assert(DC && "Cannot handle non-computable dependent contexts in lookup");
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003883
John McCallaa81e162009-12-01 22:10:20 +00003884 if (!isa<TypeDecl>(DC)) {
3885 SemaRef.Diag(R.getNameLoc(), diag::err_qualified_member_nonclass)
3886 << DC << SS.getRange();
3887 return true;
John McCall129e2df2009-11-30 22:42:35 +00003888 }
3889 }
3890
John McCallaa81e162009-12-01 22:10:20 +00003891 // The record definition is complete, now look up the member.
3892 SemaRef.LookupQualifiedName(R, DC);
John McCall129e2df2009-11-30 22:42:35 +00003893
Douglas Gregor2dcc0112009-12-31 07:42:17 +00003894 if (!R.empty())
3895 return false;
3896
3897 // We didn't find anything with the given name, so try to correct
3898 // for typos.
3899 DeclarationName Name = R.getLookupName();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00003900 if (SemaRef.CorrectTypo(R, 0, &SS, DC, false, Sema::CTC_MemberLookup) &&
Douglas Gregoraaf87162010-04-14 20:04:41 +00003901 !R.empty() &&
Douglas Gregor2dcc0112009-12-31 07:42:17 +00003902 (isa<ValueDecl>(*R.begin()) || isa<FunctionTemplateDecl>(*R.begin()))) {
3903 SemaRef.Diag(R.getNameLoc(), diag::err_no_member_suggest)
3904 << Name << DC << R.getLookupName() << SS.getRange()
Douglas Gregor849b2432010-03-31 17:46:05 +00003905 << FixItHint::CreateReplacement(R.getNameLoc(),
3906 R.getLookupName().getAsString());
Douglas Gregor67dd1d42010-01-07 00:17:44 +00003907 if (NamedDecl *ND = R.getAsSingle<NamedDecl>())
3908 SemaRef.Diag(ND->getLocation(), diag::note_previous_decl)
3909 << ND->getDeclName();
Douglas Gregor2dcc0112009-12-31 07:42:17 +00003910 return false;
3911 } else {
3912 R.clear();
Douglas Gregor12eb5d62010-06-29 19:27:42 +00003913 R.setLookupName(Name);
Douglas Gregor2dcc0112009-12-31 07:42:17 +00003914 }
3915
John McCall129e2df2009-11-30 22:42:35 +00003916 return false;
3917}
3918
John McCall60d7b3a2010-08-24 06:29:42 +00003919ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003920Sema::BuildMemberReferenceExpr(Expr *Base, QualType BaseType,
John McCall129e2df2009-11-30 22:42:35 +00003921 SourceLocation OpLoc, bool IsArrow,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00003922 CXXScopeSpec &SS,
John McCall129e2df2009-11-30 22:42:35 +00003923 NamedDecl *FirstQualifierInScope,
Abramo Bagnara25777432010-08-11 22:01:17 +00003924 const DeclarationNameInfo &NameInfo,
John McCall129e2df2009-11-30 22:42:35 +00003925 const TemplateArgumentListInfo *TemplateArgs) {
John McCall2f841ba2009-12-02 03:53:29 +00003926 if (BaseType->isDependentType() ||
3927 (SS.isSet() && isDependentScopeSpecifier(SS)))
John McCall9ae2f072010-08-23 23:25:46 +00003928 return ActOnDependentMemberExpr(Base, BaseType,
John McCall129e2df2009-11-30 22:42:35 +00003929 IsArrow, OpLoc,
3930 SS, FirstQualifierInScope,
Abramo Bagnara25777432010-08-11 22:01:17 +00003931 NameInfo, TemplateArgs);
John McCall129e2df2009-11-30 22:42:35 +00003932
Abramo Bagnara25777432010-08-11 22:01:17 +00003933 LookupResult R(*this, NameInfo, LookupMemberName);
John McCall129e2df2009-11-30 22:42:35 +00003934
John McCallaa81e162009-12-01 22:10:20 +00003935 // Implicit member accesses.
3936 if (!Base) {
3937 QualType RecordTy = BaseType;
3938 if (IsArrow) RecordTy = RecordTy->getAs<PointerType>()->getPointeeType();
3939 if (LookupMemberExprInRecord(*this, R, SourceRange(),
3940 RecordTy->getAs<RecordType>(),
John McCallad00b772010-06-16 08:42:20 +00003941 OpLoc, SS, TemplateArgs != 0))
John McCallaa81e162009-12-01 22:10:20 +00003942 return ExprError();
3943
3944 // Explicit member accesses.
3945 } else {
John Wiegley429bb272011-04-08 18:41:53 +00003946 ExprResult BaseResult = Owned(Base);
John McCall60d7b3a2010-08-24 06:29:42 +00003947 ExprResult Result =
John Wiegley429bb272011-04-08 18:41:53 +00003948 LookupMemberExpr(R, BaseResult, IsArrow, OpLoc,
John McCalld226f652010-08-21 09:40:31 +00003949 SS, /*ObjCImpDecl*/ 0, TemplateArgs != 0);
John McCallaa81e162009-12-01 22:10:20 +00003950
John Wiegley429bb272011-04-08 18:41:53 +00003951 if (BaseResult.isInvalid())
3952 return ExprError();
3953 Base = BaseResult.take();
3954
John McCallaa81e162009-12-01 22:10:20 +00003955 if (Result.isInvalid()) {
3956 Owned(Base);
3957 return ExprError();
3958 }
3959
3960 if (Result.get())
3961 return move(Result);
Sebastian Redlf3e63372010-05-07 09:25:11 +00003962
3963 // LookupMemberExpr can modify Base, and thus change BaseType
3964 BaseType = Base->getType();
John McCall129e2df2009-11-30 22:42:35 +00003965 }
3966
John McCall9ae2f072010-08-23 23:25:46 +00003967 return BuildMemberReferenceExpr(Base, BaseType,
John McCallc2233c52010-01-15 08:34:02 +00003968 OpLoc, IsArrow, SS, FirstQualifierInScope,
3969 R, TemplateArgs);
John McCall129e2df2009-11-30 22:42:35 +00003970}
3971
John McCall60d7b3a2010-08-24 06:29:42 +00003972ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003973Sema::BuildMemberReferenceExpr(Expr *BaseExpr, QualType BaseExprType,
John McCallaa81e162009-12-01 22:10:20 +00003974 SourceLocation OpLoc, bool IsArrow,
3975 const CXXScopeSpec &SS,
John McCallc2233c52010-01-15 08:34:02 +00003976 NamedDecl *FirstQualifierInScope,
John McCall129e2df2009-11-30 22:42:35 +00003977 LookupResult &R,
Douglas Gregor06a9f362010-05-01 20:49:11 +00003978 const TemplateArgumentListInfo *TemplateArgs,
3979 bool SuppressQualifierCheck) {
John McCallaa81e162009-12-01 22:10:20 +00003980 QualType BaseType = BaseExprType;
John McCall129e2df2009-11-30 22:42:35 +00003981 if (IsArrow) {
3982 assert(BaseType->isPointerType());
3983 BaseType = BaseType->getAs<PointerType>()->getPointeeType();
3984 }
John McCall161755a2010-04-06 21:38:20 +00003985 R.setBaseObjectType(BaseType);
John McCall129e2df2009-11-30 22:42:35 +00003986
Abramo Bagnara25777432010-08-11 22:01:17 +00003987 const DeclarationNameInfo &MemberNameInfo = R.getLookupNameInfo();
3988 DeclarationName MemberName = MemberNameInfo.getName();
3989 SourceLocation MemberLoc = MemberNameInfo.getLoc();
John McCall129e2df2009-11-30 22:42:35 +00003990
3991 if (R.isAmbiguous())
Douglas Gregorfe85ced2009-08-06 03:17:00 +00003992 return ExprError();
3993
John McCall129e2df2009-11-30 22:42:35 +00003994 if (R.empty()) {
3995 // Rederive where we looked up.
3996 DeclContext *DC = (SS.isSet()
3997 ? computeDeclContext(SS, false)
3998 : BaseType->getAs<RecordType>()->getDecl());
Nate Begeman2ef13e52009-08-10 23:49:36 +00003999
John McCall129e2df2009-11-30 22:42:35 +00004000 Diag(R.getNameLoc(), diag::err_no_member)
John McCallaa81e162009-12-01 22:10:20 +00004001 << MemberName << DC
4002 << (BaseExpr ? BaseExpr->getSourceRange() : SourceRange());
John McCall129e2df2009-11-30 22:42:35 +00004003 return ExprError();
4004 }
4005
John McCallc2233c52010-01-15 08:34:02 +00004006 // Diagnose lookups that find only declarations from a non-base
4007 // type. This is possible for either qualified lookups (which may
4008 // have been qualified with an unrelated type) or implicit member
4009 // expressions (which were found with unqualified lookup and thus
4010 // may have come from an enclosing scope). Note that it's okay for
4011 // lookup to find declarations from a non-base type as long as those
4012 // aren't the ones picked by overload resolution.
4013 if ((SS.isSet() || !BaseExpr ||
4014 (isa<CXXThisExpr>(BaseExpr) &&
4015 cast<CXXThisExpr>(BaseExpr)->isImplicit())) &&
Douglas Gregor06a9f362010-05-01 20:49:11 +00004016 !SuppressQualifierCheck &&
John McCallc2233c52010-01-15 08:34:02 +00004017 CheckQualifiedMemberReference(BaseExpr, BaseType, SS, R))
John McCall129e2df2009-11-30 22:42:35 +00004018 return ExprError();
4019
4020 // Construct an unresolved result if we in fact got an unresolved
4021 // result.
4022 if (R.isOverloadedResult() || R.isUnresolvableResult()) {
John McCallc373d482010-01-27 01:50:18 +00004023 // Suppress any lookup-related diagnostics; we'll do these when we
4024 // pick a member.
4025 R.suppressDiagnostics();
4026
John McCall129e2df2009-11-30 22:42:35 +00004027 UnresolvedMemberExpr *MemExpr
Douglas Gregorbebbe0d2010-12-15 01:34:56 +00004028 = UnresolvedMemberExpr::Create(Context, R.isUnresolvableResult(),
John McCallaa81e162009-12-01 22:10:20 +00004029 BaseExpr, BaseExprType,
4030 IsArrow, OpLoc,
Douglas Gregor4c9be892011-02-28 20:01:57 +00004031 SS.getWithLocInContext(Context),
Abramo Bagnara25777432010-08-11 22:01:17 +00004032 MemberNameInfo,
Douglas Gregor5a84dec2010-05-23 18:57:34 +00004033 TemplateArgs, R.begin(), R.end());
John McCall129e2df2009-11-30 22:42:35 +00004034
4035 return Owned(MemExpr);
4036 }
4037
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004038 assert(R.isSingleResult());
John McCall161755a2010-04-06 21:38:20 +00004039 DeclAccessPair FoundDecl = R.begin().getPair();
John McCall129e2df2009-11-30 22:42:35 +00004040 NamedDecl *MemberDecl = R.getFoundDecl();
4041
4042 // FIXME: diagnose the presence of template arguments now.
4043
4044 // If the decl being referenced had an error, return an error for this
4045 // sub-expr without emitting another error, in order to avoid cascading
4046 // error cases.
4047 if (MemberDecl->isInvalidDecl())
4048 return ExprError();
4049
John McCallaa81e162009-12-01 22:10:20 +00004050 // Handle the implicit-member-access case.
4051 if (!BaseExpr) {
4052 // If this is not an instance member, convert to a non-member access.
John McCall161755a2010-04-06 21:38:20 +00004053 if (!MemberDecl->isCXXInstanceMember())
Abramo Bagnara25777432010-08-11 22:01:17 +00004054 return BuildDeclarationNameExpr(SS, R.getLookupNameInfo(), MemberDecl);
John McCallaa81e162009-12-01 22:10:20 +00004055
Douglas Gregor828a1972010-01-07 23:12:05 +00004056 SourceLocation Loc = R.getNameLoc();
4057 if (SS.getRange().isValid())
4058 Loc = SS.getRange().getBegin();
4059 BaseExpr = new (Context) CXXThisExpr(Loc, BaseExprType,/*isImplicit=*/true);
John McCallaa81e162009-12-01 22:10:20 +00004060 }
4061
John McCall129e2df2009-11-30 22:42:35 +00004062 bool ShouldCheckUse = true;
4063 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(MemberDecl)) {
4064 // Don't diagnose the use of a virtual member function unless it's
4065 // explicitly qualified.
4066 if (MD->isVirtual() && !SS.isSet())
4067 ShouldCheckUse = false;
4068 }
4069
4070 // Check the use of this member.
4071 if (ShouldCheckUse && DiagnoseUseOfDecl(MemberDecl, MemberLoc)) {
4072 Owned(BaseExpr);
4073 return ExprError();
4074 }
4075
John McCallf6a16482010-12-04 03:47:34 +00004076 // Perform a property load on the base regardless of whether we
4077 // actually need it for the declaration.
John Wiegley429bb272011-04-08 18:41:53 +00004078 if (BaseExpr->getObjectKind() == OK_ObjCProperty) {
4079 ExprResult Result = ConvertPropertyForRValue(BaseExpr);
4080 if (Result.isInvalid())
4081 return ExprError();
4082 BaseExpr = Result.take();
4083 }
John McCallf6a16482010-12-04 03:47:34 +00004084
John McCalldfa1edb2010-11-23 20:48:44 +00004085 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl))
4086 return BuildFieldReferenceExpr(*this, BaseExpr, IsArrow,
4087 SS, FD, FoundDecl, MemberNameInfo);
John McCall129e2df2009-11-30 22:42:35 +00004088
Francois Pichet87c2e122010-11-21 06:08:52 +00004089 if (IndirectFieldDecl *FD = dyn_cast<IndirectFieldDecl>(MemberDecl))
4090 // We may have found a field within an anonymous union or struct
4091 // (C++ [class.union]).
John McCall5808ce42011-02-03 08:15:49 +00004092 return BuildAnonymousStructUnionMemberReference(SS, MemberLoc, FD,
John McCallf6a16482010-12-04 03:47:34 +00004093 BaseExpr, OpLoc);
Francois Pichet87c2e122010-11-21 06:08:52 +00004094
John McCall129e2df2009-11-30 22:42:35 +00004095 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) {
4096 MarkDeclarationReferenced(MemberLoc, Var);
4097 return Owned(BuildMemberExpr(Context, BaseExpr, IsArrow, SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00004098 Var, FoundDecl, MemberNameInfo,
John McCallf89e55a2010-11-18 06:31:45 +00004099 Var->getType().getNonReferenceType(),
John McCall09431682010-11-18 19:01:18 +00004100 VK_LValue, OK_Ordinary));
John McCall129e2df2009-11-30 22:42:35 +00004101 }
4102
John McCallf89e55a2010-11-18 06:31:45 +00004103 if (CXXMethodDecl *MemberFn = dyn_cast<CXXMethodDecl>(MemberDecl)) {
John McCall864c0412011-04-26 20:42:42 +00004104 ExprValueKind valueKind;
4105 QualType type;
4106 if (MemberFn->isInstance()) {
4107 valueKind = VK_RValue;
4108 type = Context.BoundMemberTy;
4109 } else {
4110 valueKind = VK_LValue;
4111 type = MemberFn->getType();
4112 }
4113
John McCall129e2df2009-11-30 22:42:35 +00004114 MarkDeclarationReferenced(MemberLoc, MemberDecl);
4115 return Owned(BuildMemberExpr(Context, BaseExpr, IsArrow, SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00004116 MemberFn, FoundDecl, MemberNameInfo,
John McCall864c0412011-04-26 20:42:42 +00004117 type, valueKind, OK_Ordinary));
John McCall129e2df2009-11-30 22:42:35 +00004118 }
John McCallf89e55a2010-11-18 06:31:45 +00004119 assert(!isa<FunctionDecl>(MemberDecl) && "member function not C++ method?");
John McCall129e2df2009-11-30 22:42:35 +00004120
4121 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) {
4122 MarkDeclarationReferenced(MemberLoc, MemberDecl);
4123 return Owned(BuildMemberExpr(Context, BaseExpr, IsArrow, SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00004124 Enum, FoundDecl, MemberNameInfo,
John McCallf89e55a2010-11-18 06:31:45 +00004125 Enum->getType(), VK_RValue, OK_Ordinary));
John McCall129e2df2009-11-30 22:42:35 +00004126 }
4127
4128 Owned(BaseExpr);
4129
Douglas Gregorb0fd4832010-04-25 20:55:08 +00004130 // We found something that we didn't expect. Complain.
John McCall129e2df2009-11-30 22:42:35 +00004131 if (isa<TypeDecl>(MemberDecl))
Abramo Bagnara25777432010-08-11 22:01:17 +00004132 Diag(MemberLoc, diag::err_typecheck_member_reference_type)
Douglas Gregorb0fd4832010-04-25 20:55:08 +00004133 << MemberName << BaseType << int(IsArrow);
4134 else
4135 Diag(MemberLoc, diag::err_typecheck_member_reference_unknown)
4136 << MemberName << BaseType << int(IsArrow);
John McCall129e2df2009-11-30 22:42:35 +00004137
Douglas Gregorb0fd4832010-04-25 20:55:08 +00004138 Diag(MemberDecl->getLocation(), diag::note_member_declared_here)
4139 << MemberName;
Douglas Gregor2b147f02010-04-25 21:15:30 +00004140 R.suppressDiagnostics();
Douglas Gregorb0fd4832010-04-25 20:55:08 +00004141 return ExprError();
John McCall129e2df2009-11-30 22:42:35 +00004142}
4143
John McCall028d3972010-12-15 16:46:44 +00004144/// Given that normal member access failed on the given expression,
4145/// and given that the expression's type involves builtin-id or
4146/// builtin-Class, decide whether substituting in the redefinition
4147/// types would be profitable. The redefinition type is whatever
4148/// this translation unit tried to typedef to id/Class; we store
4149/// it to the side and then re-use it in places like this.
John Wiegley429bb272011-04-08 18:41:53 +00004150static bool ShouldTryAgainWithRedefinitionType(Sema &S, ExprResult &base) {
John McCall028d3972010-12-15 16:46:44 +00004151 const ObjCObjectPointerType *opty
John Wiegley429bb272011-04-08 18:41:53 +00004152 = base.get()->getType()->getAs<ObjCObjectPointerType>();
John McCall028d3972010-12-15 16:46:44 +00004153 if (!opty) return false;
4154
4155 const ObjCObjectType *ty = opty->getObjectType();
4156
4157 QualType redef;
4158 if (ty->isObjCId()) {
4159 redef = S.Context.ObjCIdRedefinitionType;
4160 } else if (ty->isObjCClass()) {
4161 redef = S.Context.ObjCClassRedefinitionType;
4162 } else {
4163 return false;
4164 }
4165
4166 // Do the substitution as long as the redefinition type isn't just a
4167 // possibly-qualified pointer to builtin-id or builtin-Class again.
4168 opty = redef->getAs<ObjCObjectPointerType>();
4169 if (opty && !opty->getObjectType()->getInterface() != 0)
4170 return false;
4171
John Wiegley429bb272011-04-08 18:41:53 +00004172 base = S.ImpCastExprToType(base.take(), redef, CK_BitCast);
John McCall028d3972010-12-15 16:46:44 +00004173 return true;
4174}
4175
John McCall129e2df2009-11-30 22:42:35 +00004176/// Look up the given member of the given non-type-dependent
4177/// expression. This can return in one of two ways:
4178/// * If it returns a sentinel null-but-valid result, the caller will
4179/// assume that lookup was performed and the results written into
4180/// the provided structure. It will take over from there.
4181/// * Otherwise, the returned expression will be produced in place of
4182/// an ordinary member expression.
4183///
4184/// The ObjCImpDecl bit is a gross hack that will need to be properly
4185/// fixed for ObjC++.
John McCall60d7b3a2010-08-24 06:29:42 +00004186ExprResult
John Wiegley429bb272011-04-08 18:41:53 +00004187Sema::LookupMemberExpr(LookupResult &R, ExprResult &BaseExpr,
John McCall812c1542009-12-07 22:46:59 +00004188 bool &IsArrow, SourceLocation OpLoc,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00004189 CXXScopeSpec &SS,
John McCalld226f652010-08-21 09:40:31 +00004190 Decl *ObjCImpDecl, bool HasTemplateArgs) {
John Wiegley429bb272011-04-08 18:41:53 +00004191 assert(BaseExpr.get() && "no base expression");
Mike Stump1eb44332009-09-09 15:08:12 +00004192
Steve Naroff3cc4af82007-12-16 21:42:28 +00004193 // Perform default conversions.
John Wiegley429bb272011-04-08 18:41:53 +00004194 BaseExpr = DefaultFunctionArrayConversion(BaseExpr.take());
Sebastian Redl0eb23302009-01-19 00:08:26 +00004195
John Wiegley429bb272011-04-08 18:41:53 +00004196 if (IsArrow) {
4197 BaseExpr = DefaultLvalueConversion(BaseExpr.take());
4198 if (BaseExpr.isInvalid())
4199 return ExprError();
4200 }
4201
4202 QualType BaseType = BaseExpr.get()->getType();
John McCall129e2df2009-11-30 22:42:35 +00004203 assert(!BaseType->isDependentType());
4204
4205 DeclarationName MemberName = R.getLookupName();
4206 SourceLocation MemberLoc = R.getNameLoc();
Douglas Gregor3f0b5fd2009-11-06 06:30:47 +00004207
John McCall028d3972010-12-15 16:46:44 +00004208 // For later type-checking purposes, turn arrow accesses into dot
4209 // accesses. The only access type we support that doesn't follow
4210 // the C equivalence "a->b === (*a).b" is ObjC property accesses,
4211 // and those never use arrows, so this is unaffected.
4212 if (IsArrow) {
4213 if (const PointerType *Ptr = BaseType->getAs<PointerType>())
4214 BaseType = Ptr->getPointeeType();
4215 else if (const ObjCObjectPointerType *Ptr
4216 = BaseType->getAs<ObjCObjectPointerType>())
4217 BaseType = Ptr->getPointeeType();
4218 else if (BaseType->isRecordType()) {
4219 // Recover from arrow accesses to records, e.g.:
4220 // struct MyRecord foo;
4221 // foo->bar
4222 // This is actually well-formed in C++ if MyRecord has an
4223 // overloaded operator->, but that should have been dealt with
4224 // by now.
4225 Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
John Wiegley429bb272011-04-08 18:41:53 +00004226 << BaseType << int(IsArrow) << BaseExpr.get()->getSourceRange()
John McCall028d3972010-12-15 16:46:44 +00004227 << FixItHint::CreateReplacement(OpLoc, ".");
4228 IsArrow = false;
John McCall864c0412011-04-26 20:42:42 +00004229 } else if (BaseType == Context.BoundMemberTy) {
4230 goto fail;
John McCall028d3972010-12-15 16:46:44 +00004231 } else {
4232 Diag(MemberLoc, diag::err_typecheck_member_reference_arrow)
John Wiegley429bb272011-04-08 18:41:53 +00004233 << BaseType << BaseExpr.get()->getSourceRange();
John McCall028d3972010-12-15 16:46:44 +00004234 return ExprError();
Douglas Gregor3f0b5fd2009-11-06 06:30:47 +00004235 }
4236 }
4237
John McCall028d3972010-12-15 16:46:44 +00004238 // Handle field access to simple records.
4239 if (const RecordType *RTy = BaseType->getAs<RecordType>()) {
John Wiegley429bb272011-04-08 18:41:53 +00004240 if (LookupMemberExprInRecord(*this, R, BaseExpr.get()->getSourceRange(),
John McCall028d3972010-12-15 16:46:44 +00004241 RTy, OpLoc, SS, HasTemplateArgs))
4242 return ExprError();
4243
4244 // Returning valid-but-null is how we indicate to the caller that
4245 // the lookup result was filled in.
4246 return Owned((Expr*) 0);
David Chisnall0f436562009-08-17 16:35:33 +00004247 }
John McCall129e2df2009-11-30 22:42:35 +00004248
John McCall028d3972010-12-15 16:46:44 +00004249 // Handle ivar access to Objective-C objects.
4250 if (const ObjCObjectType *OTy = BaseType->getAs<ObjCObjectType>()) {
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004251 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
John McCall028d3972010-12-15 16:46:44 +00004252
4253 // There are three cases for the base type:
4254 // - builtin id (qualified or unqualified)
4255 // - builtin Class (qualified or unqualified)
4256 // - an interface
4257 ObjCInterfaceDecl *IDecl = OTy->getInterface();
4258 if (!IDecl) {
John McCallf85e1932011-06-15 23:02:42 +00004259 if (getLangOptions().ObjCAutoRefCount &&
4260 (OTy->isObjCId() || OTy->isObjCClass()))
4261 goto fail;
John McCall028d3972010-12-15 16:46:44 +00004262 // There's an implicit 'isa' ivar on all objects.
4263 // But we only actually find it this way on objects of type 'id',
4264 // apparently.
4265 if (OTy->isObjCId() && Member->isStr("isa"))
John Wiegley429bb272011-04-08 18:41:53 +00004266 return Owned(new (Context) ObjCIsaExpr(BaseExpr.take(), IsArrow, MemberLoc,
John McCall028d3972010-12-15 16:46:44 +00004267 Context.getObjCClassType()));
4268
4269 if (ShouldTryAgainWithRedefinitionType(*this, BaseExpr))
4270 return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS,
4271 ObjCImpDecl, HasTemplateArgs);
4272 goto fail;
4273 }
4274
4275 ObjCInterfaceDecl *ClassDeclared;
4276 ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared);
4277
4278 if (!IV) {
4279 // Attempt to correct for typos in ivar names.
4280 LookupResult Res(*this, R.getLookupName(), R.getNameLoc(),
4281 LookupMemberName);
4282 if (CorrectTypo(Res, 0, 0, IDecl, false,
4283 IsArrow ? CTC_ObjCIvarLookup
4284 : CTC_ObjCPropertyLookup) &&
4285 (IV = Res.getAsSingle<ObjCIvarDecl>())) {
4286 Diag(R.getNameLoc(),
4287 diag::err_typecheck_member_reference_ivar_suggest)
4288 << IDecl->getDeclName() << MemberName << IV->getDeclName()
4289 << FixItHint::CreateReplacement(R.getNameLoc(),
4290 IV->getNameAsString());
4291 Diag(IV->getLocation(), diag::note_previous_decl)
4292 << IV->getDeclName();
4293 } else {
4294 Res.clear();
4295 Res.setLookupName(Member);
4296
4297 Diag(MemberLoc, diag::err_typecheck_member_reference_ivar)
4298 << IDecl->getDeclName() << MemberName
John Wiegley429bb272011-04-08 18:41:53 +00004299 << BaseExpr.get()->getSourceRange();
John McCall028d3972010-12-15 16:46:44 +00004300 return ExprError();
4301 }
4302 }
4303
4304 // If the decl being referenced had an error, return an error for this
4305 // sub-expr without emitting another error, in order to avoid cascading
4306 // error cases.
4307 if (IV->isInvalidDecl())
4308 return ExprError();
4309
4310 // Check whether we can reference this field.
4311 if (DiagnoseUseOfDecl(IV, MemberLoc))
4312 return ExprError();
4313 if (IV->getAccessControl() != ObjCIvarDecl::Public &&
4314 IV->getAccessControl() != ObjCIvarDecl::Package) {
4315 ObjCInterfaceDecl *ClassOfMethodDecl = 0;
4316 if (ObjCMethodDecl *MD = getCurMethodDecl())
4317 ClassOfMethodDecl = MD->getClassInterface();
4318 else if (ObjCImpDecl && getCurFunctionDecl()) {
4319 // Case of a c-function declared inside an objc implementation.
4320 // FIXME: For a c-style function nested inside an objc implementation
4321 // class, there is no implementation context available, so we pass
4322 // down the context as argument to this routine. Ideally, this context
4323 // need be passed down in the AST node and somehow calculated from the
4324 // AST for a function decl.
4325 if (ObjCImplementationDecl *IMPD =
4326 dyn_cast<ObjCImplementationDecl>(ObjCImpDecl))
4327 ClassOfMethodDecl = IMPD->getClassInterface();
4328 else if (ObjCCategoryImplDecl* CatImplClass =
4329 dyn_cast<ObjCCategoryImplDecl>(ObjCImpDecl))
4330 ClassOfMethodDecl = CatImplClass->getClassInterface();
4331 }
4332
4333 if (IV->getAccessControl() == ObjCIvarDecl::Private) {
4334 if (ClassDeclared != IDecl ||
4335 ClassOfMethodDecl != ClassDeclared)
4336 Diag(MemberLoc, diag::error_private_ivar_access)
4337 << IV->getDeclName();
4338 } else if (!IDecl->isSuperClassOf(ClassOfMethodDecl))
4339 // @protected
4340 Diag(MemberLoc, diag::error_protected_ivar_access)
4341 << IV->getDeclName();
4342 }
Fariborz Jahanianb1f7d242011-06-16 17:29:56 +00004343 if (getLangOptions().ObjCAutoRefCount) {
4344 Expr *BaseExp = BaseExpr.get()->IgnoreParenImpCasts();
4345 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(BaseExp))
4346 if (UO->getOpcode() == UO_Deref)
4347 BaseExp = UO->getSubExpr()->IgnoreParenCasts();
4348
4349 if (DeclRefExpr *DE = dyn_cast<DeclRefExpr>(BaseExp))
4350 if (DE->getType().getObjCLifetime() == Qualifiers::OCL_Weak)
4351 Diag(DE->getLocation(), diag::error_arc_weak_ivar_access);
4352 }
John McCall028d3972010-12-15 16:46:44 +00004353
4354 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(),
John Wiegley429bb272011-04-08 18:41:53 +00004355 MemberLoc, BaseExpr.take(),
John McCall028d3972010-12-15 16:46:44 +00004356 IsArrow));
4357 }
4358
4359 // Objective-C property access.
4360 const ObjCObjectPointerType *OPT;
4361 if (!IsArrow && (OPT = BaseType->getAs<ObjCObjectPointerType>())) {
4362 // This actually uses the base as an r-value.
John Wiegley429bb272011-04-08 18:41:53 +00004363 BaseExpr = DefaultLvalueConversion(BaseExpr.take());
4364 if (BaseExpr.isInvalid())
4365 return ExprError();
4366
4367 assert(Context.hasSameUnqualifiedType(BaseType, BaseExpr.get()->getType()));
John McCall028d3972010-12-15 16:46:44 +00004368
4369 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
4370
4371 const ObjCObjectType *OT = OPT->getObjectType();
4372
4373 // id, with and without qualifiers.
4374 if (OT->isObjCId()) {
4375 // Check protocols on qualified interfaces.
4376 Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
4377 if (Decl *PMDecl = FindGetterSetterNameDecl(OPT, Member, Sel, Context)) {
4378 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) {
4379 // Check the use of this declaration
4380 if (DiagnoseUseOfDecl(PD, MemberLoc))
4381 return ExprError();
4382
Douglas Gregor926df6c2011-06-11 01:09:30 +00004383 QualType T = PD->getType();
4384 if (ObjCMethodDecl *Getter = PD->getGetterMethodDecl())
4385 T = getMessageSendResultType(BaseType, Getter, false, false);
4386
4387 return Owned(new (Context) ObjCPropertyRefExpr(PD, T,
John McCall028d3972010-12-15 16:46:44 +00004388 VK_LValue,
4389 OK_ObjCProperty,
4390 MemberLoc,
John Wiegley429bb272011-04-08 18:41:53 +00004391 BaseExpr.take()));
John McCall028d3972010-12-15 16:46:44 +00004392 }
4393
4394 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) {
4395 // Check the use of this method.
4396 if (DiagnoseUseOfDecl(OMD, MemberLoc))
4397 return ExprError();
4398 Selector SetterSel =
4399 SelectorTable::constructSetterName(PP.getIdentifierTable(),
4400 PP.getSelectorTable(), Member);
4401 ObjCMethodDecl *SMD = 0;
4402 if (Decl *SDecl = FindGetterSetterNameDecl(OPT, /*Property id*/0,
4403 SetterSel, Context))
4404 SMD = dyn_cast<ObjCMethodDecl>(SDecl);
Douglas Gregor926df6c2011-06-11 01:09:30 +00004405 QualType PType = getMessageSendResultType(BaseType, OMD, false,
4406 false);
John McCall028d3972010-12-15 16:46:44 +00004407
4408 ExprValueKind VK = VK_LValue;
4409 if (!getLangOptions().CPlusPlus &&
4410 IsCForbiddenLValueType(Context, PType))
4411 VK = VK_RValue;
4412 ExprObjectKind OK = (VK == VK_RValue ? OK_Ordinary : OK_ObjCProperty);
4413
4414 return Owned(new (Context) ObjCPropertyRefExpr(OMD, SMD, PType,
4415 VK, OK,
John Wiegley429bb272011-04-08 18:41:53 +00004416 MemberLoc, BaseExpr.take()));
John McCall028d3972010-12-15 16:46:44 +00004417 }
4418 }
Fariborz Jahanian4eb7f692011-03-15 17:27:48 +00004419 // Use of id.member can only be for a property reference. Do not
4420 // use the 'id' redefinition in this case.
4421 if (IsArrow && ShouldTryAgainWithRedefinitionType(*this, BaseExpr))
John McCall028d3972010-12-15 16:46:44 +00004422 return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS,
4423 ObjCImpDecl, HasTemplateArgs);
4424
4425 return ExprError(Diag(MemberLoc, diag::err_property_not_found)
4426 << MemberName << BaseType);
4427 }
4428
4429 // 'Class', unqualified only.
4430 if (OT->isObjCClass()) {
4431 // Only works in a method declaration (??!).
4432 ObjCMethodDecl *MD = getCurMethodDecl();
4433 if (!MD) {
4434 if (ShouldTryAgainWithRedefinitionType(*this, BaseExpr))
4435 return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS,
4436 ObjCImpDecl, HasTemplateArgs);
4437
4438 goto fail;
4439 }
4440
4441 // Also must look for a getter name which uses property syntax.
4442 Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004443 ObjCInterfaceDecl *IFace = MD->getClassInterface();
4444 ObjCMethodDecl *Getter;
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004445 if ((Getter = IFace->lookupClassMethod(Sel))) {
4446 // Check the use of this method.
4447 if (DiagnoseUseOfDecl(Getter, MemberLoc))
4448 return ExprError();
John McCall028d3972010-12-15 16:46:44 +00004449 } else
Fariborz Jahanian74b27562010-12-03 23:37:08 +00004450 Getter = IFace->lookupPrivateMethod(Sel, false);
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004451 // If we found a getter then this may be a valid dot-reference, we
4452 // will look for the matching setter, in case it is needed.
4453 Selector SetterSel =
John McCall028d3972010-12-15 16:46:44 +00004454 SelectorTable::constructSetterName(PP.getIdentifierTable(),
4455 PP.getSelectorTable(), Member);
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004456 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
4457 if (!Setter) {
4458 // If this reference is in an @implementation, also check for 'private'
4459 // methods.
Fariborz Jahanian74b27562010-12-03 23:37:08 +00004460 Setter = IFace->lookupPrivateMethod(SetterSel, false);
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004461 }
4462 // Look through local category implementations associated with the class.
4463 if (!Setter)
4464 Setter = IFace->getCategoryClassMethod(SetterSel);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004465
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004466 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
4467 return ExprError();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004468
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004469 if (Getter || Setter) {
4470 QualType PType;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004471
John McCall09431682010-11-18 19:01:18 +00004472 ExprValueKind VK = VK_LValue;
4473 if (Getter) {
Douglas Gregor926df6c2011-06-11 01:09:30 +00004474 PType = getMessageSendResultType(QualType(OT, 0), Getter, true,
4475 false);
John McCall09431682010-11-18 19:01:18 +00004476 if (!getLangOptions().CPlusPlus &&
4477 IsCForbiddenLValueType(Context, PType))
4478 VK = VK_RValue;
4479 } else {
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004480 // Get the expression type from Setter's incoming parameter.
4481 PType = (*(Setter->param_end() -1))->getType();
John McCall09431682010-11-18 19:01:18 +00004482 }
4483 ExprObjectKind OK = (VK == VK_RValue ? OK_Ordinary : OK_ObjCProperty);
4484
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004485 // FIXME: we must check that the setter has property type.
John McCall12f78a62010-12-02 01:19:52 +00004486 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter,
4487 PType, VK, OK,
John Wiegley429bb272011-04-08 18:41:53 +00004488 MemberLoc, BaseExpr.take()));
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004489 }
John McCall028d3972010-12-15 16:46:44 +00004490
4491 if (ShouldTryAgainWithRedefinitionType(*this, BaseExpr))
4492 return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS,
4493 ObjCImpDecl, HasTemplateArgs);
4494
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004495 return ExprError(Diag(MemberLoc, diag::err_property_not_found)
John McCall028d3972010-12-15 16:46:44 +00004496 << MemberName << BaseType);
Steve Naroff14108da2009-07-10 23:34:53 +00004497 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00004498
John McCall028d3972010-12-15 16:46:44 +00004499 // Normal property access.
John Wiegley429bb272011-04-08 18:41:53 +00004500 return HandleExprPropertyRefExpr(OPT, BaseExpr.get(), MemberName, MemberLoc,
John McCall028d3972010-12-15 16:46:44 +00004501 SourceLocation(), QualType(), false);
Steve Naroff14108da2009-07-10 23:34:53 +00004502 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00004503
Chris Lattnerfb173ec2008-07-21 04:28:12 +00004504 // Handle 'field access' to vectors, such as 'V.xx'.
Chris Lattner73525de2009-02-16 21:11:58 +00004505 if (BaseType->isExtVectorType()) {
John McCall5e3c67b2010-12-15 04:42:30 +00004506 // FIXME: this expr should store IsArrow.
Anders Carlsson8f28f992009-08-26 18:25:21 +00004507 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
John Wiegley429bb272011-04-08 18:41:53 +00004508 ExprValueKind VK = (IsArrow ? VK_LValue : BaseExpr.get()->getValueKind());
John McCall09431682010-11-18 19:01:18 +00004509 QualType ret = CheckExtVectorComponent(*this, BaseType, VK, OpLoc,
4510 Member, MemberLoc);
Chris Lattnerfb173ec2008-07-21 04:28:12 +00004511 if (ret.isNull())
Sebastian Redl0eb23302009-01-19 00:08:26 +00004512 return ExprError();
John McCall09431682010-11-18 19:01:18 +00004513
John Wiegley429bb272011-04-08 18:41:53 +00004514 return Owned(new (Context) ExtVectorElementExpr(ret, VK, BaseExpr.take(),
John McCall09431682010-11-18 19:01:18 +00004515 *Member, MemberLoc));
Chris Lattnerfb173ec2008-07-21 04:28:12 +00004516 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004517
John McCall028d3972010-12-15 16:46:44 +00004518 // Adjust builtin-sel to the appropriate redefinition type if that's
4519 // not just a pointer to builtin-sel again.
4520 if (IsArrow &&
4521 BaseType->isSpecificBuiltinType(BuiltinType::ObjCSel) &&
4522 !Context.ObjCSelRedefinitionType->isObjCSelType()) {
John Wiegley429bb272011-04-08 18:41:53 +00004523 BaseExpr = ImpCastExprToType(BaseExpr.take(), Context.ObjCSelRedefinitionType,
4524 CK_BitCast);
John McCall028d3972010-12-15 16:46:44 +00004525 return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS,
4526 ObjCImpDecl, HasTemplateArgs);
4527 }
4528
4529 // Failure cases.
4530 fail:
4531
Matt Beaumont-Gay65b34d72011-02-22 23:52:53 +00004532 // Recover from dot accesses to pointers, e.g.:
4533 // type *foo;
4534 // foo.bar
4535 // This is actually well-formed in two cases:
4536 // - 'type' is an Objective C type
4537 // - 'bar' is a pseudo-destructor name which happens to refer to
4538 // the appropriate pointer type
John McCall028d3972010-12-15 16:46:44 +00004539 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) {
Matt Beaumont-Gay65b34d72011-02-22 23:52:53 +00004540 if (!IsArrow && Ptr->getPointeeType()->isRecordType() &&
4541 MemberName.getNameKind() != DeclarationName::CXXDestructorName) {
John McCall028d3972010-12-15 16:46:44 +00004542 Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
John Wiegley429bb272011-04-08 18:41:53 +00004543 << BaseType << int(IsArrow) << BaseExpr.get()->getSourceRange()
Matt Beaumont-Gay65b34d72011-02-22 23:52:53 +00004544 << FixItHint::CreateReplacement(OpLoc, "->");
John McCall028d3972010-12-15 16:46:44 +00004545
4546 // Recurse as an -> access.
4547 IsArrow = true;
4548 return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS,
4549 ObjCImpDecl, HasTemplateArgs);
4550 }
John McCall028d3972010-12-15 16:46:44 +00004551 }
4552
Matt Beaumont-Gay65b34d72011-02-22 23:52:53 +00004553 // If the user is trying to apply -> or . to a function name, it's probably
4554 // because they forgot parentheses to call that function.
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00004555 QualType ZeroArgCallTy;
4556 UnresolvedSet<4> Overloads;
4557 if (isExprCallable(*BaseExpr.get(), ZeroArgCallTy, Overloads)) {
4558 if (ZeroArgCallTy.isNull()) {
John Wiegley429bb272011-04-08 18:41:53 +00004559 Diag(BaseExpr.get()->getExprLoc(), diag::err_member_reference_needs_call)
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00004560 << (Overloads.size() > 1) << 0 << BaseExpr.get()->getSourceRange();
4561 UnresolvedSet<2> PlausibleOverloads;
4562 for (OverloadExpr::decls_iterator It = Overloads.begin(),
4563 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
4564 const FunctionDecl *OverloadDecl = cast<FunctionDecl>(*It);
4565 QualType OverloadResultTy = OverloadDecl->getResultType();
4566 if ((!IsArrow && OverloadResultTy->isRecordType()) ||
4567 (IsArrow && OverloadResultTy->isPointerType() &&
4568 OverloadResultTy->getPointeeType()->isRecordType()))
4569 PlausibleOverloads.addDecl(It.getDecl());
Matt Beaumont-Gay65b34d72011-02-22 23:52:53 +00004570 }
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00004571 NoteOverloads(PlausibleOverloads, BaseExpr.get()->getExprLoc());
Matt Beaumont-Gay65b34d72011-02-22 23:52:53 +00004572 return ExprError();
4573 }
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00004574 if ((!IsArrow && ZeroArgCallTy->isRecordType()) ||
4575 (IsArrow && ZeroArgCallTy->isPointerType() &&
4576 ZeroArgCallTy->getPointeeType()->isRecordType())) {
4577 // At this point, we know BaseExpr looks like it's potentially callable
4578 // with 0 arguments, and that it returns something of a reasonable type,
4579 // so we can emit a fixit and carry on pretending that BaseExpr was
4580 // actually a CallExpr.
4581 SourceLocation ParenInsertionLoc =
4582 PP.getLocForEndOfToken(BaseExpr.get()->getLocEnd());
4583 Diag(BaseExpr.get()->getExprLoc(), diag::err_member_reference_needs_call)
4584 << (Overloads.size() > 1) << 1 << BaseExpr.get()->getSourceRange()
4585 << FixItHint::CreateInsertion(ParenInsertionLoc, "()");
4586 // FIXME: Try this before emitting the fixit, and suppress diagnostics
4587 // while doing so.
4588 ExprResult NewBase =
4589 ActOnCallExpr(0, BaseExpr.take(), ParenInsertionLoc,
4590 MultiExprArg(*this, 0, 0),
4591 ParenInsertionLoc.getFileLocWithOffset(1));
4592 if (NewBase.isInvalid())
4593 return ExprError();
4594 BaseExpr = NewBase;
4595 BaseExpr = DefaultFunctionArrayConversion(BaseExpr.take());
4596 return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS,
4597 ObjCImpDecl, HasTemplateArgs);
Matt Beaumont-Gay65b34d72011-02-22 23:52:53 +00004598 }
Matt Beaumont-Gay65b34d72011-02-22 23:52:53 +00004599 }
4600
Douglas Gregor214f31a2009-03-27 06:00:30 +00004601 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union)
John Wiegley429bb272011-04-08 18:41:53 +00004602 << BaseType << BaseExpr.get()->getSourceRange();
Douglas Gregor214f31a2009-03-27 06:00:30 +00004603
Douglas Gregor214f31a2009-03-27 06:00:30 +00004604 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00004605}
4606
John McCall129e2df2009-11-30 22:42:35 +00004607/// The main callback when the parser finds something like
4608/// expression . [nested-name-specifier] identifier
4609/// expression -> [nested-name-specifier] identifier
4610/// where 'identifier' encompasses a fairly broad spectrum of
4611/// possibilities, including destructor and operator references.
4612///
4613/// \param OpKind either tok::arrow or tok::period
4614/// \param HasTrailingLParen whether the next token is '(', which
4615/// is used to diagnose mis-uses of special members that can
4616/// only be called
4617/// \param ObjCImpDecl the current ObjC @implementation decl;
4618/// this is an ugly hack around the fact that ObjC @implementations
4619/// aren't properly put in the context chain
John McCall60d7b3a2010-08-24 06:29:42 +00004620ExprResult Sema::ActOnMemberAccessExpr(Scope *S, Expr *Base,
John McCall5e3c67b2010-12-15 04:42:30 +00004621 SourceLocation OpLoc,
4622 tok::TokenKind OpKind,
4623 CXXScopeSpec &SS,
4624 UnqualifiedId &Id,
4625 Decl *ObjCImpDecl,
4626 bool HasTrailingLParen) {
John McCall129e2df2009-11-30 22:42:35 +00004627 if (SS.isSet() && SS.isInvalid())
4628 return ExprError();
4629
Francois Pichetdbee3412011-01-18 05:04:39 +00004630 // Warn about the explicit constructor calls Microsoft extension.
4631 if (getLangOptions().Microsoft &&
4632 Id.getKind() == UnqualifiedId::IK_ConstructorName)
4633 Diag(Id.getSourceRange().getBegin(),
4634 diag::ext_ms_explicit_constructor_call);
4635
John McCall129e2df2009-11-30 22:42:35 +00004636 TemplateArgumentListInfo TemplateArgsBuffer;
4637
4638 // Decompose the name into its component parts.
Abramo Bagnara25777432010-08-11 22:01:17 +00004639 DeclarationNameInfo NameInfo;
John McCall129e2df2009-11-30 22:42:35 +00004640 const TemplateArgumentListInfo *TemplateArgs;
4641 DecomposeUnqualifiedId(*this, Id, TemplateArgsBuffer,
Abramo Bagnara25777432010-08-11 22:01:17 +00004642 NameInfo, TemplateArgs);
John McCall129e2df2009-11-30 22:42:35 +00004643
Abramo Bagnara25777432010-08-11 22:01:17 +00004644 DeclarationName Name = NameInfo.getName();
John McCall129e2df2009-11-30 22:42:35 +00004645 bool IsArrow = (OpKind == tok::arrow);
4646
4647 NamedDecl *FirstQualifierInScope
4648 = (!SS.isSet() ? 0 : FindFirstQualifierInScope(S,
4649 static_cast<NestedNameSpecifier*>(SS.getScopeRep())));
4650
4651 // This is a postfix expression, so get rid of ParenListExprs.
John McCall60d7b3a2010-08-24 06:29:42 +00004652 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base);
John McCall9ae2f072010-08-23 23:25:46 +00004653 if (Result.isInvalid()) return ExprError();
4654 Base = Result.take();
John McCall129e2df2009-11-30 22:42:35 +00004655
Douglas Gregor01e56ae2010-04-12 20:54:26 +00004656 if (Base->getType()->isDependentType() || Name.isDependentName() ||
4657 isDependentScopeSpecifier(SS)) {
John McCall9ae2f072010-08-23 23:25:46 +00004658 Result = ActOnDependentMemberExpr(Base, Base->getType(),
John McCall129e2df2009-11-30 22:42:35 +00004659 IsArrow, OpLoc,
4660 SS, FirstQualifierInScope,
Abramo Bagnara25777432010-08-11 22:01:17 +00004661 NameInfo, TemplateArgs);
John McCall129e2df2009-11-30 22:42:35 +00004662 } else {
Abramo Bagnara25777432010-08-11 22:01:17 +00004663 LookupResult R(*this, NameInfo, LookupMemberName);
John Wiegley429bb272011-04-08 18:41:53 +00004664 ExprResult BaseResult = Owned(Base);
4665 Result = LookupMemberExpr(R, BaseResult, IsArrow, OpLoc,
John McCallad00b772010-06-16 08:42:20 +00004666 SS, ObjCImpDecl, TemplateArgs != 0);
John Wiegley429bb272011-04-08 18:41:53 +00004667 if (BaseResult.isInvalid())
4668 return ExprError();
4669 Base = BaseResult.take();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00004670
John McCallad00b772010-06-16 08:42:20 +00004671 if (Result.isInvalid()) {
4672 Owned(Base);
4673 return ExprError();
4674 }
John McCall129e2df2009-11-30 22:42:35 +00004675
John McCallad00b772010-06-16 08:42:20 +00004676 if (Result.get()) {
4677 // The only way a reference to a destructor can be used is to
4678 // immediately call it, which falls into this case. If the
4679 // next token is not a '(', produce a diagnostic and build the
4680 // call now.
4681 if (!HasTrailingLParen &&
4682 Id.getKind() == UnqualifiedId::IK_DestructorName)
John McCall9ae2f072010-08-23 23:25:46 +00004683 return DiagnoseDtorReference(NameInfo.getLoc(), Result.get());
John McCall129e2df2009-11-30 22:42:35 +00004684
John McCallad00b772010-06-16 08:42:20 +00004685 return move(Result);
John McCall129e2df2009-11-30 22:42:35 +00004686 }
4687
John McCall9ae2f072010-08-23 23:25:46 +00004688 Result = BuildMemberReferenceExpr(Base, Base->getType(),
John McCallc2233c52010-01-15 08:34:02 +00004689 OpLoc, IsArrow, SS, FirstQualifierInScope,
4690 R, TemplateArgs);
John McCall129e2df2009-11-30 22:42:35 +00004691 }
4692
4693 return move(Result);
Anders Carlsson8f28f992009-08-26 18:25:21 +00004694}
4695
John McCall60d7b3a2010-08-24 06:29:42 +00004696ExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc,
Nico Weber08e41a62010-11-29 18:19:25 +00004697 FunctionDecl *FD,
4698 ParmVarDecl *Param) {
Anders Carlsson56c5e332009-08-25 03:49:14 +00004699 if (Param->hasUnparsedDefaultArg()) {
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004700 Diag(CallLoc,
Nico Weber15d5c832010-11-30 04:44:33 +00004701 diag::err_use_of_default_argument_to_function_declared_later) <<
Anders Carlsson56c5e332009-08-25 03:49:14 +00004702 FD << cast<CXXRecordDecl>(FD->getDeclContext())->getDeclName();
Mike Stump1eb44332009-09-09 15:08:12 +00004703 Diag(UnparsedDefaultArgLocs[Param],
Nico Weber15d5c832010-11-30 04:44:33 +00004704 diag::note_default_argument_declared_here);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004705 return ExprError();
4706 }
4707
4708 if (Param->hasUninstantiatedDefaultArg()) {
4709 Expr *UninstExpr = Param->getUninstantiatedDefaultArg();
Anders Carlsson56c5e332009-08-25 03:49:14 +00004710
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004711 // Instantiate the expression.
4712 MultiLevelTemplateArgumentList ArgList
4713 = getTemplateInstantiationArgs(FD, 0, /*RelativeToPrimary=*/true);
Anders Carlsson25cae7f2009-09-05 05:14:19 +00004714
Nico Weber08e41a62010-11-29 18:19:25 +00004715 std::pair<const TemplateArgument *, unsigned> Innermost
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004716 = ArgList.getInnermost();
4717 InstantiatingTemplate Inst(*this, CallLoc, Param, Innermost.first,
4718 Innermost.second);
Anders Carlsson56c5e332009-08-25 03:49:14 +00004719
Nico Weber08e41a62010-11-29 18:19:25 +00004720 ExprResult Result;
4721 {
4722 // C++ [dcl.fct.default]p5:
4723 // The names in the [default argument] expression are bound, and
4724 // the semantic constraints are checked, at the point where the
4725 // default argument expression appears.
Nico Weber15d5c832010-11-30 04:44:33 +00004726 ContextRAII SavedContext(*this, FD);
Nico Weber08e41a62010-11-29 18:19:25 +00004727 Result = SubstExpr(UninstExpr, ArgList);
4728 }
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004729 if (Result.isInvalid())
4730 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00004731
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004732 // Check the expression as an initializer for the parameter.
4733 InitializedEntity Entity
Fariborz Jahanian745da3a2010-09-24 17:30:16 +00004734 = InitializedEntity::InitializeParameter(Context, Param);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004735 InitializationKind Kind
4736 = InitializationKind::CreateCopy(Param->getLocation(),
4737 /*FIXME:EqualLoc*/UninstExpr->getSourceRange().getBegin());
4738 Expr *ResultE = Result.takeAs<Expr>();
Douglas Gregor65222e82009-12-23 18:19:08 +00004739
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004740 InitializationSequence InitSeq(*this, Entity, Kind, &ResultE, 1);
4741 Result = InitSeq.Perform(*this, Entity, Kind,
4742 MultiExprArg(*this, &ResultE, 1));
4743 if (Result.isInvalid())
4744 return ExprError();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004745
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004746 // Build the default argument expression.
4747 return Owned(CXXDefaultArgExpr::Create(Context, CallLoc, Param,
4748 Result.takeAs<Expr>()));
Anders Carlsson56c5e332009-08-25 03:49:14 +00004749 }
4750
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004751 // If the default expression creates temporaries, we need to
4752 // push them to the current stack of expression temporaries so they'll
4753 // be properly destroyed.
4754 // FIXME: We should really be rebuilding the default argument with new
4755 // bound temporaries; see the comment in PR5810.
Douglas Gregor5833b0b2010-09-14 22:55:20 +00004756 for (unsigned i = 0, e = Param->getNumDefaultArgTemporaries(); i != e; ++i) {
4757 CXXTemporary *Temporary = Param->getDefaultArgTemporary(i);
4758 MarkDeclarationReferenced(Param->getDefaultArg()->getLocStart(),
4759 const_cast<CXXDestructorDecl*>(Temporary->getDestructor()));
4760 ExprTemporaries.push_back(Temporary);
John McCallf85e1932011-06-15 23:02:42 +00004761 ExprNeedsCleanups = true;
Douglas Gregor5833b0b2010-09-14 22:55:20 +00004762 }
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004763
4764 // We already type-checked the argument, so we know it works.
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00004765 // Just mark all of the declarations in this potentially-evaluated expression
4766 // as being "referenced".
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004767 MarkDeclarationsReferencedInExpr(Param->getDefaultArg());
Douglas Gregor036aed12009-12-23 23:03:06 +00004768 return Owned(CXXDefaultArgExpr::Create(Context, CallLoc, Param));
Anders Carlsson56c5e332009-08-25 03:49:14 +00004769}
4770
Douglas Gregor88a35142008-12-22 05:46:06 +00004771/// ConvertArgumentsForCall - Converts the arguments specified in
4772/// Args/NumArgs to the parameter types of the function FDecl with
4773/// function prototype Proto. Call is the call expression itself, and
4774/// Fn is the function expression. For a C++ member function, this
4775/// routine does not attempt to convert the object argument. Returns
4776/// true if the call is ill-formed.
Mike Stumpeed9cac2009-02-19 03:04:26 +00004777bool
4778Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn,
Douglas Gregor88a35142008-12-22 05:46:06 +00004779 FunctionDecl *FDecl,
Douglas Gregor72564e72009-02-26 23:50:07 +00004780 const FunctionProtoType *Proto,
Douglas Gregor88a35142008-12-22 05:46:06 +00004781 Expr **Args, unsigned NumArgs,
4782 SourceLocation RParenLoc) {
John McCall8e10f3b2011-02-26 05:39:39 +00004783 // Bail out early if calling a builtin with custom typechecking.
4784 // We don't need to do this in the
4785 if (FDecl)
4786 if (unsigned ID = FDecl->getBuiltinID())
4787 if (Context.BuiltinInfo.hasCustomTypechecking(ID))
4788 return false;
4789
Mike Stumpeed9cac2009-02-19 03:04:26 +00004790 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by
Douglas Gregor88a35142008-12-22 05:46:06 +00004791 // assignment, to the types of the corresponding parameter, ...
4792 unsigned NumArgsInProto = Proto->getNumArgs();
Douglas Gregor3fd56d72009-01-23 21:30:56 +00004793 bool Invalid = false;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004794
Douglas Gregor88a35142008-12-22 05:46:06 +00004795 // If too few arguments are available (and we don't have default
4796 // arguments for the remaining parameters), don't make the call.
4797 if (NumArgs < NumArgsInProto) {
4798 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments())
4799 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args)
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00004800 << Fn->getType()->isBlockPointerType()
Eric Christopherd77b9a22010-04-16 04:48:22 +00004801 << NumArgsInProto << NumArgs << Fn->getSourceRange();
Ted Kremenek8189cde2009-02-07 01:47:29 +00004802 Call->setNumArgs(Context, NumArgsInProto);
Douglas Gregor88a35142008-12-22 05:46:06 +00004803 }
4804
4805 // If too many are passed and not variadic, error on the extras and drop
4806 // them.
4807 if (NumArgs > NumArgsInProto) {
4808 if (!Proto->isVariadic()) {
4809 Diag(Args[NumArgsInProto]->getLocStart(),
4810 diag::err_typecheck_call_too_many_args)
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00004811 << Fn->getType()->isBlockPointerType()
Eric Christopherccfa9632010-04-16 04:56:46 +00004812 << NumArgsInProto << NumArgs << Fn->getSourceRange()
Douglas Gregor88a35142008-12-22 05:46:06 +00004813 << SourceRange(Args[NumArgsInProto]->getLocStart(),
4814 Args[NumArgs-1]->getLocEnd());
Ted Kremenek5862f0e2011-04-04 17:22:27 +00004815
4816 // Emit the location of the prototype.
4817 if (FDecl && !FDecl->getBuiltinID())
4818 Diag(FDecl->getLocStart(),
4819 diag::note_typecheck_call_too_many_args)
4820 << FDecl;
4821
Douglas Gregor88a35142008-12-22 05:46:06 +00004822 // This deletes the extra arguments.
Ted Kremenek8189cde2009-02-07 01:47:29 +00004823 Call->setNumArgs(Context, NumArgsInProto);
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004824 return true;
Douglas Gregor88a35142008-12-22 05:46:06 +00004825 }
Douglas Gregor88a35142008-12-22 05:46:06 +00004826 }
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004827 llvm::SmallVector<Expr *, 8> AllArgs;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004828 VariadicCallType CallType =
Fariborz Jahanian4cd1c702009-11-24 19:27:49 +00004829 Proto->isVariadic() ? VariadicFunction : VariadicDoesNotApply;
4830 if (Fn->getType()->isBlockPointerType())
4831 CallType = VariadicBlock; // Block
4832 else if (isa<MemberExpr>(Fn))
4833 CallType = VariadicMethod;
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004834 Invalid = GatherArgumentsForCall(Call->getSourceRange().getBegin(), FDecl,
Fariborz Jahanian2fe168f2009-11-24 21:37:28 +00004835 Proto, 0, Args, NumArgs, AllArgs, CallType);
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004836 if (Invalid)
4837 return true;
4838 unsigned TotalNumArgs = AllArgs.size();
4839 for (unsigned i = 0; i < TotalNumArgs; ++i)
4840 Call->setArg(i, AllArgs[i]);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004841
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004842 return false;
4843}
Mike Stumpeed9cac2009-02-19 03:04:26 +00004844
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004845bool Sema::GatherArgumentsForCall(SourceLocation CallLoc,
4846 FunctionDecl *FDecl,
4847 const FunctionProtoType *Proto,
4848 unsigned FirstProtoArg,
4849 Expr **Args, unsigned NumArgs,
4850 llvm::SmallVector<Expr *, 8> &AllArgs,
Fariborz Jahanian4cd1c702009-11-24 19:27:49 +00004851 VariadicCallType CallType) {
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004852 unsigned NumArgsInProto = Proto->getNumArgs();
4853 unsigned NumArgsToCheck = NumArgs;
4854 bool Invalid = false;
4855 if (NumArgs != NumArgsInProto)
4856 // Use default arguments for missing arguments
4857 NumArgsToCheck = NumArgsInProto;
4858 unsigned ArgIx = 0;
Douglas Gregor88a35142008-12-22 05:46:06 +00004859 // Continue to check argument types (even if we have too few/many args).
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004860 for (unsigned i = FirstProtoArg; i != NumArgsToCheck; i++) {
Douglas Gregor88a35142008-12-22 05:46:06 +00004861 QualType ProtoArgType = Proto->getArgType(i);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004862
Douglas Gregor88a35142008-12-22 05:46:06 +00004863 Expr *Arg;
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004864 if (ArgIx < NumArgs) {
4865 Arg = Args[ArgIx++];
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004866
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00004867 if (RequireCompleteType(Arg->getSourceRange().getBegin(),
4868 ProtoArgType,
Anders Carlssonb7906612009-08-26 23:45:07 +00004869 PDiag(diag::err_call_incomplete_argument)
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004870 << Arg->getSourceRange()))
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00004871 return true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004872
Douglas Gregora188ff22009-12-22 16:09:06 +00004873 // Pass the argument
4874 ParmVarDecl *Param = 0;
4875 if (FDecl && i < FDecl->getNumParams())
4876 Param = FDecl->getParamDecl(i);
Douglas Gregoraa037312009-12-22 07:24:36 +00004877
Douglas Gregora188ff22009-12-22 16:09:06 +00004878 InitializedEntity Entity =
Fariborz Jahanian745da3a2010-09-24 17:30:16 +00004879 Param? InitializedEntity::InitializeParameter(Context, Param)
John McCallf85e1932011-06-15 23:02:42 +00004880 : InitializedEntity::InitializeParameter(Context, ProtoArgType,
4881 Proto->isArgConsumed(i));
John McCall60d7b3a2010-08-24 06:29:42 +00004882 ExprResult ArgE = PerformCopyInitialization(Entity,
John McCallf6a16482010-12-04 03:47:34 +00004883 SourceLocation(),
4884 Owned(Arg));
Douglas Gregora188ff22009-12-22 16:09:06 +00004885 if (ArgE.isInvalid())
4886 return true;
4887
4888 Arg = ArgE.takeAs<Expr>();
Anders Carlsson5e300d12009-06-12 16:51:40 +00004889 } else {
Anders Carlssoned961f92009-08-25 02:29:20 +00004890 ParmVarDecl *Param = FDecl->getParamDecl(i);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004891
John McCall60d7b3a2010-08-24 06:29:42 +00004892 ExprResult ArgExpr =
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004893 BuildCXXDefaultArgExpr(CallLoc, FDecl, Param);
Anders Carlsson56c5e332009-08-25 03:49:14 +00004894 if (ArgExpr.isInvalid())
4895 return true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004896
Anders Carlsson56c5e332009-08-25 03:49:14 +00004897 Arg = ArgExpr.takeAs<Expr>();
Anders Carlsson5e300d12009-06-12 16:51:40 +00004898 }
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004899 AllArgs.push_back(Arg);
Douglas Gregor88a35142008-12-22 05:46:06 +00004900 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004901
Douglas Gregor88a35142008-12-22 05:46:06 +00004902 // If this is a variadic call, handle args passed through "...".
Fariborz Jahanian4cd1c702009-11-24 19:27:49 +00004903 if (CallType != VariadicDoesNotApply) {
John McCall755d8492011-04-12 00:42:48 +00004904
4905 // Assume that extern "C" functions with variadic arguments that
4906 // return __unknown_anytype aren't *really* variadic.
4907 if (Proto->getResultType() == Context.UnknownAnyTy &&
4908 FDecl && FDecl->isExternC()) {
4909 for (unsigned i = ArgIx; i != NumArgs; ++i) {
4910 ExprResult arg;
4911 if (isa<ExplicitCastExpr>(Args[i]->IgnoreParens()))
4912 arg = DefaultFunctionArrayLvalueConversion(Args[i]);
4913 else
4914 arg = DefaultVariadicArgumentPromotion(Args[i], CallType, FDecl);
4915 Invalid |= arg.isInvalid();
4916 AllArgs.push_back(arg.take());
4917 }
4918
4919 // Otherwise do argument promotion, (C99 6.5.2.2p7).
4920 } else {
4921 for (unsigned i = ArgIx; i != NumArgs; ++i) {
4922 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], CallType, FDecl);
4923 Invalid |= Arg.isInvalid();
4924 AllArgs.push_back(Arg.take());
4925 }
Douglas Gregor88a35142008-12-22 05:46:06 +00004926 }
4927 }
Douglas Gregor3fd56d72009-01-23 21:30:56 +00004928 return Invalid;
Douglas Gregor88a35142008-12-22 05:46:06 +00004929}
4930
John McCall755d8492011-04-12 00:42:48 +00004931/// Given a function expression of unknown-any type, try to rebuild it
4932/// to have a function type.
4933static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *fn);
4934
Steve Narofff69936d2007-09-16 03:34:24 +00004935/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments.
Reid Spencer5f016e22007-07-11 17:01:13 +00004936/// This provides the location of the left/right parens and a list of comma
4937/// locations.
John McCall60d7b3a2010-08-24 06:29:42 +00004938ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00004939Sema::ActOnCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc,
Peter Collingbournee08ce652011-02-09 21:07:24 +00004940 MultiExprArg args, SourceLocation RParenLoc,
4941 Expr *ExecConfig) {
Sebastian Redl0eb23302009-01-19 00:08:26 +00004942 unsigned NumArgs = args.size();
Nate Begeman2ef13e52009-08-10 23:49:36 +00004943
4944 // Since this might be a postfix expression, get rid of ParenListExprs.
John McCall60d7b3a2010-08-24 06:29:42 +00004945 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Fn);
John McCall9ae2f072010-08-23 23:25:46 +00004946 if (Result.isInvalid()) return ExprError();
4947 Fn = Result.take();
Mike Stump1eb44332009-09-09 15:08:12 +00004948
John McCall9ae2f072010-08-23 23:25:46 +00004949 Expr **Args = args.release();
Mike Stump1eb44332009-09-09 15:08:12 +00004950
Douglas Gregor88a35142008-12-22 05:46:06 +00004951 if (getLangOptions().CPlusPlus) {
Douglas Gregora71d8192009-09-04 17:36:40 +00004952 // If this is a pseudo-destructor expression, build the call immediately.
4953 if (isa<CXXPseudoDestructorExpr>(Fn)) {
4954 if (NumArgs > 0) {
4955 // Pseudo-destructor calls should not have any arguments.
4956 Diag(Fn->getLocStart(), diag::err_pseudo_dtor_call_with_args)
Douglas Gregor849b2432010-03-31 17:46:05 +00004957 << FixItHint::CreateRemoval(
Douglas Gregora71d8192009-09-04 17:36:40 +00004958 SourceRange(Args[0]->getLocStart(),
4959 Args[NumArgs-1]->getLocEnd()));
Mike Stump1eb44332009-09-09 15:08:12 +00004960
Douglas Gregora71d8192009-09-04 17:36:40 +00004961 NumArgs = 0;
4962 }
Mike Stump1eb44332009-09-09 15:08:12 +00004963
Douglas Gregora71d8192009-09-04 17:36:40 +00004964 return Owned(new (Context) CallExpr(Context, Fn, 0, 0, Context.VoidTy,
John McCallf89e55a2010-11-18 06:31:45 +00004965 VK_RValue, RParenLoc));
Douglas Gregora71d8192009-09-04 17:36:40 +00004966 }
Mike Stump1eb44332009-09-09 15:08:12 +00004967
Douglas Gregor17330012009-02-04 15:01:18 +00004968 // Determine whether this is a dependent call inside a C++ template,
Mike Stumpeed9cac2009-02-19 03:04:26 +00004969 // in which case we won't do any semantic analysis now.
Mike Stump390b4cc2009-05-16 07:39:55 +00004970 // FIXME: Will need to cache the results of name lookup (including ADL) in
4971 // Fn.
Douglas Gregor17330012009-02-04 15:01:18 +00004972 bool Dependent = false;
4973 if (Fn->isTypeDependent())
4974 Dependent = true;
4975 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs))
4976 Dependent = true;
4977
Peter Collingbournee08ce652011-02-09 21:07:24 +00004978 if (Dependent) {
4979 if (ExecConfig) {
4980 return Owned(new (Context) CUDAKernelCallExpr(
4981 Context, Fn, cast<CallExpr>(ExecConfig), Args, NumArgs,
4982 Context.DependentTy, VK_RValue, RParenLoc));
4983 } else {
4984 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs,
4985 Context.DependentTy, VK_RValue,
4986 RParenLoc));
4987 }
4988 }
Douglas Gregor17330012009-02-04 15:01:18 +00004989
4990 // Determine whether this is a call to an object (C++ [over.call.object]).
4991 if (Fn->getType()->isRecordType())
4992 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs,
Douglas Gregora1a04782010-09-09 16:33:13 +00004993 RParenLoc));
Douglas Gregor17330012009-02-04 15:01:18 +00004994
John McCall755d8492011-04-12 00:42:48 +00004995 if (Fn->getType() == Context.UnknownAnyTy) {
4996 ExprResult result = rebuildUnknownAnyFunction(*this, Fn);
4997 if (result.isInvalid()) return ExprError();
4998 Fn = result.take();
4999 }
5000
John McCall864c0412011-04-26 20:42:42 +00005001 if (Fn->getType() == Context.BoundMemberTy) {
John McCallaa81e162009-12-01 22:10:20 +00005002 return BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs,
Douglas Gregora1a04782010-09-09 16:33:13 +00005003 RParenLoc);
John McCall129e2df2009-11-30 22:42:35 +00005004 }
John McCall864c0412011-04-26 20:42:42 +00005005 }
John McCall129e2df2009-11-30 22:42:35 +00005006
John McCall864c0412011-04-26 20:42:42 +00005007 // Check for overloaded calls. This can happen even in C due to extensions.
5008 if (Fn->getType() == Context.OverloadTy) {
5009 OverloadExpr::FindResult find = OverloadExpr::find(Fn);
5010
5011 // We aren't supposed to apply this logic if there's an '&' involved.
5012 if (!find.IsAddressOfOperand) {
5013 OverloadExpr *ovl = find.Expression;
5014 if (isa<UnresolvedLookupExpr>(ovl)) {
5015 UnresolvedLookupExpr *ULE = cast<UnresolvedLookupExpr>(ovl);
5016 return BuildOverloadedCallExpr(S, Fn, ULE, LParenLoc, Args, NumArgs,
5017 RParenLoc, ExecConfig);
5018 } else {
John McCallaa81e162009-12-01 22:10:20 +00005019 return BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs,
Douglas Gregora1a04782010-09-09 16:33:13 +00005020 RParenLoc);
Anders Carlsson83ccfc32009-10-03 17:40:22 +00005021 }
5022 }
Douglas Gregor88a35142008-12-22 05:46:06 +00005023 }
5024
Douglas Gregorfa047642009-02-04 00:32:51 +00005025 // If we're directly calling a function, get the appropriate declaration.
Mike Stumpeed9cac2009-02-19 03:04:26 +00005026
Eli Friedmanefa42f72009-12-26 03:35:45 +00005027 Expr *NakedFn = Fn->IgnoreParens();
Douglas Gregoref9b1492010-11-09 20:03:54 +00005028
John McCall3b4294e2009-12-16 12:17:52 +00005029 NamedDecl *NDecl = 0;
Douglas Gregord8f0ade2010-10-25 20:48:33 +00005030 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(NakedFn))
5031 if (UnOp->getOpcode() == UO_AddrOf)
5032 NakedFn = UnOp->getSubExpr()->IgnoreParens();
5033
John McCall3b4294e2009-12-16 12:17:52 +00005034 if (isa<DeclRefExpr>(NakedFn))
5035 NDecl = cast<DeclRefExpr>(NakedFn)->getDecl();
John McCall864c0412011-04-26 20:42:42 +00005036 else if (isa<MemberExpr>(NakedFn))
5037 NDecl = cast<MemberExpr>(NakedFn)->getMemberDecl();
John McCall3b4294e2009-12-16 12:17:52 +00005038
Peter Collingbournee08ce652011-02-09 21:07:24 +00005039 return BuildResolvedCallExpr(Fn, NDecl, LParenLoc, Args, NumArgs, RParenLoc,
5040 ExecConfig);
5041}
5042
5043ExprResult
5044Sema::ActOnCUDAExecConfigExpr(Scope *S, SourceLocation LLLLoc,
5045 MultiExprArg execConfig, SourceLocation GGGLoc) {
5046 FunctionDecl *ConfigDecl = Context.getcudaConfigureCallDecl();
5047 if (!ConfigDecl)
5048 return ExprError(Diag(LLLLoc, diag::err_undeclared_var_use)
5049 << "cudaConfigureCall");
5050 QualType ConfigQTy = ConfigDecl->getType();
5051
5052 DeclRefExpr *ConfigDR = new (Context) DeclRefExpr(
5053 ConfigDecl, ConfigQTy, VK_LValue, LLLLoc);
5054
5055 return ActOnCallExpr(S, ConfigDR, LLLLoc, execConfig, GGGLoc, 0);
John McCallaa81e162009-12-01 22:10:20 +00005056}
5057
Tanya Lattner61eee0c2011-06-04 00:47:47 +00005058/// ActOnAsTypeExpr - create a new asType (bitcast) from the arguments.
5059///
5060/// __builtin_astype( value, dst type )
5061///
5062ExprResult Sema::ActOnAsTypeExpr(Expr *expr, ParsedType destty,
5063 SourceLocation BuiltinLoc,
5064 SourceLocation RParenLoc) {
5065 ExprValueKind VK = VK_RValue;
5066 ExprObjectKind OK = OK_Ordinary;
5067 QualType DstTy = GetTypeFromParser(destty);
5068 QualType SrcTy = expr->getType();
5069 if (Context.getTypeSize(DstTy) != Context.getTypeSize(SrcTy))
5070 return ExprError(Diag(BuiltinLoc,
5071 diag::err_invalid_astype_of_different_size)
Peter Collingbourneaf9cddf2011-06-08 15:15:17 +00005072 << DstTy
5073 << SrcTy
Tanya Lattner61eee0c2011-06-04 00:47:47 +00005074 << expr->getSourceRange());
5075 return Owned(new (Context) AsTypeExpr(expr, DstTy, VK, OK, BuiltinLoc, RParenLoc));
5076}
5077
John McCall3b4294e2009-12-16 12:17:52 +00005078/// BuildResolvedCallExpr - Build a call to a resolved expression,
5079/// i.e. an expression not of \p OverloadTy. The expression should
John McCallaa81e162009-12-01 22:10:20 +00005080/// unary-convert to an expression of function-pointer or
5081/// block-pointer type.
5082///
5083/// \param NDecl the declaration being called, if available
John McCall60d7b3a2010-08-24 06:29:42 +00005084ExprResult
John McCallaa81e162009-12-01 22:10:20 +00005085Sema::BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl,
5086 SourceLocation LParenLoc,
5087 Expr **Args, unsigned NumArgs,
Peter Collingbournee08ce652011-02-09 21:07:24 +00005088 SourceLocation RParenLoc,
5089 Expr *Config) {
John McCallaa81e162009-12-01 22:10:20 +00005090 FunctionDecl *FDecl = dyn_cast_or_null<FunctionDecl>(NDecl);
5091
Chris Lattner04421082008-04-08 04:40:51 +00005092 // Promote the function operand.
John Wiegley429bb272011-04-08 18:41:53 +00005093 ExprResult Result = UsualUnaryConversions(Fn);
5094 if (Result.isInvalid())
5095 return ExprError();
5096 Fn = Result.take();
Chris Lattner04421082008-04-08 04:40:51 +00005097
Chris Lattner925e60d2007-12-28 05:29:59 +00005098 // Make the call expr early, before semantic checks. This guarantees cleanup
5099 // of arguments and function on error.
Peter Collingbournee08ce652011-02-09 21:07:24 +00005100 CallExpr *TheCall;
5101 if (Config) {
5102 TheCall = new (Context) CUDAKernelCallExpr(Context, Fn,
5103 cast<CallExpr>(Config),
5104 Args, NumArgs,
5105 Context.BoolTy,
5106 VK_RValue,
5107 RParenLoc);
5108 } else {
5109 TheCall = new (Context) CallExpr(Context, Fn,
5110 Args, NumArgs,
5111 Context.BoolTy,
5112 VK_RValue,
5113 RParenLoc);
5114 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00005115
John McCall8e10f3b2011-02-26 05:39:39 +00005116 unsigned BuiltinID = (FDecl ? FDecl->getBuiltinID() : 0);
5117
5118 // Bail out early if calling a builtin with custom typechecking.
5119 if (BuiltinID && Context.BuiltinInfo.hasCustomTypechecking(BuiltinID))
5120 return CheckBuiltinFunctionCall(BuiltinID, TheCall);
5121
John McCall1de4d4e2011-04-07 08:22:57 +00005122 retry:
Steve Naroffdd972f22008-09-05 22:11:13 +00005123 const FunctionType *FuncT;
John McCall8e10f3b2011-02-26 05:39:39 +00005124 if (const PointerType *PT = Fn->getType()->getAs<PointerType>()) {
Steve Naroffdd972f22008-09-05 22:11:13 +00005125 // C99 6.5.2.2p1 - "The expression that denotes the called function shall
5126 // have type pointer to function".
John McCall183700f2009-09-21 23:43:11 +00005127 FuncT = PT->getPointeeType()->getAs<FunctionType>();
John McCall8e10f3b2011-02-26 05:39:39 +00005128 if (FuncT == 0)
5129 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
5130 << Fn->getType() << Fn->getSourceRange());
5131 } else if (const BlockPointerType *BPT =
5132 Fn->getType()->getAs<BlockPointerType>()) {
5133 FuncT = BPT->getPointeeType()->castAs<FunctionType>();
5134 } else {
John McCall1de4d4e2011-04-07 08:22:57 +00005135 // Handle calls to expressions of unknown-any type.
5136 if (Fn->getType() == Context.UnknownAnyTy) {
John McCall755d8492011-04-12 00:42:48 +00005137 ExprResult rewrite = rebuildUnknownAnyFunction(*this, Fn);
John McCall1de4d4e2011-04-07 08:22:57 +00005138 if (rewrite.isInvalid()) return ExprError();
5139 Fn = rewrite.take();
John McCalla5fc4722011-04-09 22:50:59 +00005140 TheCall->setCallee(Fn);
John McCall1de4d4e2011-04-07 08:22:57 +00005141 goto retry;
5142 }
5143
Sebastian Redl0eb23302009-01-19 00:08:26 +00005144 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
5145 << Fn->getType() << Fn->getSourceRange());
John McCall8e10f3b2011-02-26 05:39:39 +00005146 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00005147
Peter Collingbourne0423fc62011-02-23 01:53:29 +00005148 if (getLangOptions().CUDA) {
5149 if (Config) {
5150 // CUDA: Kernel calls must be to global functions
5151 if (FDecl && !FDecl->hasAttr<CUDAGlobalAttr>())
5152 return ExprError(Diag(LParenLoc,diag::err_kern_call_not_global_function)
5153 << FDecl->getName() << Fn->getSourceRange());
5154
5155 // CUDA: Kernel function must have 'void' return type
5156 if (!FuncT->getResultType()->isVoidType())
5157 return ExprError(Diag(LParenLoc, diag::err_kern_type_not_void_return)
5158 << Fn->getType() << Fn->getSourceRange());
5159 }
5160 }
5161
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00005162 // Check for a valid return type
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005163 if (CheckCallReturnType(FuncT->getResultType(),
John McCall9ae2f072010-08-23 23:25:46 +00005164 Fn->getSourceRange().getBegin(), TheCall,
Anders Carlsson8c8d9192009-10-09 23:51:55 +00005165 FDecl))
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00005166 return ExprError();
5167
Chris Lattner925e60d2007-12-28 05:29:59 +00005168 // We know the result type of the call, set it.
Douglas Gregor5291c3c2010-07-13 08:18:22 +00005169 TheCall->setType(FuncT->getCallResultType(Context));
John McCallf89e55a2010-11-18 06:31:45 +00005170 TheCall->setValueKind(Expr::getValueKindForType(FuncT->getResultType()));
Sebastian Redl0eb23302009-01-19 00:08:26 +00005171
Douglas Gregor72564e72009-02-26 23:50:07 +00005172 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) {
John McCall9ae2f072010-08-23 23:25:46 +00005173 if (ConvertArgumentsForCall(TheCall, Fn, FDecl, Proto, Args, NumArgs,
Douglas Gregor88a35142008-12-22 05:46:06 +00005174 RParenLoc))
Sebastian Redl0eb23302009-01-19 00:08:26 +00005175 return ExprError();
Chris Lattner925e60d2007-12-28 05:29:59 +00005176 } else {
Douglas Gregor72564e72009-02-26 23:50:07 +00005177 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!");
Sebastian Redl0eb23302009-01-19 00:08:26 +00005178
Douglas Gregor74734d52009-04-02 15:37:10 +00005179 if (FDecl) {
5180 // Check if we have too few/too many template arguments, based
5181 // on our knowledge of the function definition.
5182 const FunctionDecl *Def = 0;
Argyrios Kyrtzidis06a54a32010-07-07 11:31:19 +00005183 if (FDecl->hasBody(Def) && NumArgs != Def->param_size()) {
Douglas Gregor46542412010-10-25 20:39:23 +00005184 const FunctionProtoType *Proto
5185 = Def->getType()->getAs<FunctionProtoType>();
5186 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size()))
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00005187 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments)
5188 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange();
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00005189 }
Douglas Gregor46542412010-10-25 20:39:23 +00005190
5191 // If the function we're calling isn't a function prototype, but we have
5192 // a function prototype from a prior declaratiom, use that prototype.
5193 if (!FDecl->hasPrototype())
5194 Proto = FDecl->getType()->getAs<FunctionProtoType>();
Douglas Gregor74734d52009-04-02 15:37:10 +00005195 }
5196
Steve Naroffb291ab62007-08-28 23:30:39 +00005197 // Promote the arguments (C99 6.5.2.2p6).
Chris Lattner925e60d2007-12-28 05:29:59 +00005198 for (unsigned i = 0; i != NumArgs; i++) {
5199 Expr *Arg = Args[i];
Douglas Gregor46542412010-10-25 20:39:23 +00005200
5201 if (Proto && i < Proto->getNumArgs()) {
Douglas Gregor46542412010-10-25 20:39:23 +00005202 InitializedEntity Entity
5203 = InitializedEntity::InitializeParameter(Context,
John McCallf85e1932011-06-15 23:02:42 +00005204 Proto->getArgType(i),
5205 Proto->isArgConsumed(i));
Douglas Gregor46542412010-10-25 20:39:23 +00005206 ExprResult ArgE = PerformCopyInitialization(Entity,
5207 SourceLocation(),
5208 Owned(Arg));
5209 if (ArgE.isInvalid())
5210 return true;
5211
5212 Arg = ArgE.takeAs<Expr>();
5213
5214 } else {
John Wiegley429bb272011-04-08 18:41:53 +00005215 ExprResult ArgE = DefaultArgumentPromotion(Arg);
5216
5217 if (ArgE.isInvalid())
5218 return true;
5219
5220 Arg = ArgE.takeAs<Expr>();
Douglas Gregor46542412010-10-25 20:39:23 +00005221 }
5222
Douglas Gregor0700bbf2010-10-26 05:45:40 +00005223 if (RequireCompleteType(Arg->getSourceRange().getBegin(),
5224 Arg->getType(),
5225 PDiag(diag::err_call_incomplete_argument)
5226 << Arg->getSourceRange()))
5227 return ExprError();
5228
Chris Lattner925e60d2007-12-28 05:29:59 +00005229 TheCall->setArg(i, Arg);
Steve Naroffb291ab62007-08-28 23:30:39 +00005230 }
Reid Spencer5f016e22007-07-11 17:01:13 +00005231 }
Chris Lattner925e60d2007-12-28 05:29:59 +00005232
Douglas Gregor88a35142008-12-22 05:46:06 +00005233 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl))
5234 if (!Method->isStatic())
Sebastian Redl0eb23302009-01-19 00:08:26 +00005235 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object)
5236 << Fn->getSourceRange());
Douglas Gregor88a35142008-12-22 05:46:06 +00005237
Fariborz Jahaniandaf04152009-05-15 20:33:25 +00005238 // Check for sentinels
5239 if (NDecl)
5240 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs);
Mike Stump1eb44332009-09-09 15:08:12 +00005241
Chris Lattner59907c42007-08-10 20:18:51 +00005242 // Do special checking on direct calls to functions.
Anders Carlssond406bf02009-08-16 01:56:34 +00005243 if (FDecl) {
John McCall9ae2f072010-08-23 23:25:46 +00005244 if (CheckFunctionCall(FDecl, TheCall))
Anders Carlssond406bf02009-08-16 01:56:34 +00005245 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00005246
John McCall8e10f3b2011-02-26 05:39:39 +00005247 if (BuiltinID)
Fariborz Jahanian67aba812010-11-30 17:35:24 +00005248 return CheckBuiltinFunctionCall(BuiltinID, TheCall);
Anders Carlssond406bf02009-08-16 01:56:34 +00005249 } else if (NDecl) {
John McCall9ae2f072010-08-23 23:25:46 +00005250 if (CheckBlockCall(NDecl, TheCall))
Anders Carlssond406bf02009-08-16 01:56:34 +00005251 return ExprError();
5252 }
Chris Lattner59907c42007-08-10 20:18:51 +00005253
John McCall9ae2f072010-08-23 23:25:46 +00005254 return MaybeBindToTemporary(TheCall);
Reid Spencer5f016e22007-07-11 17:01:13 +00005255}
5256
John McCall60d7b3a2010-08-24 06:29:42 +00005257ExprResult
John McCallb3d87482010-08-24 05:47:05 +00005258Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, ParsedType Ty,
John McCall9ae2f072010-08-23 23:25:46 +00005259 SourceLocation RParenLoc, Expr *InitExpr) {
Steve Narofff69936d2007-09-16 03:34:24 +00005260 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type");
Steve Naroffaff1edd2007-07-19 21:32:11 +00005261 // FIXME: put back this assert when initializers are worked out.
Steve Narofff69936d2007-09-16 03:34:24 +00005262 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression");
John McCall42f56b52010-01-18 19:35:47 +00005263
5264 TypeSourceInfo *TInfo;
5265 QualType literalType = GetTypeFromParser(Ty, &TInfo);
5266 if (!TInfo)
5267 TInfo = Context.getTrivialTypeSourceInfo(literalType);
5268
John McCall9ae2f072010-08-23 23:25:46 +00005269 return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, InitExpr);
John McCall42f56b52010-01-18 19:35:47 +00005270}
5271
John McCall60d7b3a2010-08-24 06:29:42 +00005272ExprResult
John McCall42f56b52010-01-18 19:35:47 +00005273Sema::BuildCompoundLiteralExpr(SourceLocation LParenLoc, TypeSourceInfo *TInfo,
John McCall9ae2f072010-08-23 23:25:46 +00005274 SourceLocation RParenLoc, Expr *literalExpr) {
John McCall42f56b52010-01-18 19:35:47 +00005275 QualType literalType = TInfo->getType();
Anders Carlssond35c8322007-12-05 07:24:19 +00005276
Eli Friedman6223c222008-05-20 05:22:08 +00005277 if (literalType->isArrayType()) {
Argyrios Kyrtzidise6fe9a22010-11-08 19:14:19 +00005278 if (RequireCompleteType(LParenLoc, Context.getBaseElementType(literalType),
5279 PDiag(diag::err_illegal_decl_array_incomplete_type)
5280 << SourceRange(LParenLoc,
5281 literalExpr->getSourceRange().getEnd())))
5282 return ExprError();
Chris Lattnerc63a1f22008-08-04 07:31:14 +00005283 if (literalType->isVariableArrayType())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005284 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init)
5285 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()));
Douglas Gregor690dc7f2009-05-21 23:48:18 +00005286 } else if (!literalType->isDependentType() &&
5287 RequireCompleteType(LParenLoc, literalType,
Anders Carlssonb7906612009-08-26 23:45:07 +00005288 PDiag(diag::err_typecheck_decl_incomplete_type)
Mike Stump1eb44332009-09-09 15:08:12 +00005289 << SourceRange(LParenLoc,
Anders Carlssonb7906612009-08-26 23:45:07 +00005290 literalExpr->getSourceRange().getEnd())))
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005291 return ExprError();
Eli Friedman6223c222008-05-20 05:22:08 +00005292
Douglas Gregor99a2e602009-12-16 01:38:02 +00005293 InitializedEntity Entity
Douglas Gregord6542d82009-12-22 15:35:07 +00005294 = InitializedEntity::InitializeTemporary(literalType);
Douglas Gregor99a2e602009-12-16 01:38:02 +00005295 InitializationKind Kind
John McCallf85e1932011-06-15 23:02:42 +00005296 = InitializationKind::CreateCStyleCast(LParenLoc,
5297 SourceRange(LParenLoc, RParenLoc));
Eli Friedman08544622009-12-22 02:35:53 +00005298 InitializationSequence InitSeq(*this, Entity, Kind, &literalExpr, 1);
John McCall60d7b3a2010-08-24 06:29:42 +00005299 ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
John McCallca0408f2010-08-23 06:44:23 +00005300 MultiExprArg(*this, &literalExpr, 1),
Eli Friedman08544622009-12-22 02:35:53 +00005301 &literalType);
5302 if (Result.isInvalid())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005303 return ExprError();
John McCall9ae2f072010-08-23 23:25:46 +00005304 literalExpr = Result.get();
Steve Naroffe9b12192008-01-14 18:19:28 +00005305
Chris Lattner371f2582008-12-04 23:50:19 +00005306 bool isFileScope = getCurFunctionOrMethodDecl() == 0;
Steve Naroffe9b12192008-01-14 18:19:28 +00005307 if (isFileScope) { // 6.5.2.5p3
Steve Naroffd0091aa2008-01-10 22:15:12 +00005308 if (CheckForConstantInitializer(literalExpr, literalType))
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005309 return ExprError();
Steve Naroffd0091aa2008-01-10 22:15:12 +00005310 }
Eli Friedman08544622009-12-22 02:35:53 +00005311
John McCallf89e55a2010-11-18 06:31:45 +00005312 // In C, compound literals are l-values for some reason.
5313 ExprValueKind VK = getLangOptions().CPlusPlus ? VK_RValue : VK_LValue;
5314
Douglas Gregor751ec9b2011-06-17 04:59:12 +00005315 return MaybeBindToTemporary(
5316 new (Context) CompoundLiteralExpr(LParenLoc, TInfo, literalType,
5317 VK, literalExpr, isFileScope));
Steve Naroff4aa88f82007-07-19 01:06:55 +00005318}
5319
John McCall60d7b3a2010-08-24 06:29:42 +00005320ExprResult
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005321Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist,
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005322 SourceLocation RBraceLoc) {
5323 unsigned NumInit = initlist.size();
John McCall9ae2f072010-08-23 23:25:46 +00005324 Expr **InitList = initlist.release();
Anders Carlsson66b5a8a2007-08-31 04:56:16 +00005325
Steve Naroff08d92e42007-09-15 18:49:24 +00005326 // Semantic analysis for initializers is done by ActOnDeclarator() and
Mike Stumpeed9cac2009-02-19 03:04:26 +00005327 // CheckInitializer() - it requires knowledge of the object being intialized.
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005328
Ted Kremenek709210f2010-04-13 23:39:13 +00005329 InitListExpr *E = new (Context) InitListExpr(Context, LBraceLoc, InitList,
5330 NumInit, RBraceLoc);
Chris Lattnerf0467b32008-04-02 04:24:33 +00005331 E->setType(Context.VoidTy); // FIXME: just a place holder for now.
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005332 return Owned(E);
Steve Naroff4aa88f82007-07-19 01:06:55 +00005333}
5334
John McCallf3ea8cf2010-11-14 08:17:51 +00005335/// Prepares for a scalar cast, performing all the necessary stages
5336/// except the final cast and returning the kind required.
John Wiegley429bb272011-04-08 18:41:53 +00005337static CastKind PrepareScalarCast(Sema &S, ExprResult &Src, QualType DestTy) {
John McCallf3ea8cf2010-11-14 08:17:51 +00005338 // Both Src and Dest are scalar types, i.e. arithmetic or pointer.
5339 // Also, callers should have filtered out the invalid cases with
5340 // pointers. Everything else should be possible.
5341
John Wiegley429bb272011-04-08 18:41:53 +00005342 QualType SrcTy = Src.get()->getType();
John McCallf3ea8cf2010-11-14 08:17:51 +00005343 if (S.Context.hasSameUnqualifiedType(SrcTy, DestTy))
John McCall2de56d12010-08-25 11:45:40 +00005344 return CK_NoOp;
Anders Carlsson82debc72009-10-18 18:12:03 +00005345
John McCalldaa8e4e2010-11-15 09:13:47 +00005346 switch (SrcTy->getScalarTypeKind()) {
5347 case Type::STK_MemberPointer:
5348 llvm_unreachable("member pointer type in C");
Abramo Bagnarabb03f5d2011-01-04 09:50:03 +00005349
John McCalldaa8e4e2010-11-15 09:13:47 +00005350 case Type::STK_Pointer:
5351 switch (DestTy->getScalarTypeKind()) {
5352 case Type::STK_Pointer:
5353 return DestTy->isObjCObjectPointerType() ?
John McCallf3ea8cf2010-11-14 08:17:51 +00005354 CK_AnyPointerToObjCPointerCast :
5355 CK_BitCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00005356 case Type::STK_Bool:
5357 return CK_PointerToBoolean;
5358 case Type::STK_Integral:
5359 return CK_PointerToIntegral;
5360 case Type::STK_Floating:
5361 case Type::STK_FloatingComplex:
5362 case Type::STK_IntegralComplex:
5363 case Type::STK_MemberPointer:
5364 llvm_unreachable("illegal cast from pointer");
5365 }
5366 break;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005367
John McCalldaa8e4e2010-11-15 09:13:47 +00005368 case Type::STK_Bool: // casting from bool is like casting from an integer
5369 case Type::STK_Integral:
5370 switch (DestTy->getScalarTypeKind()) {
5371 case Type::STK_Pointer:
John Wiegley429bb272011-04-08 18:41:53 +00005372 if (Src.get()->isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNull))
John McCall404cd162010-11-13 01:35:44 +00005373 return CK_NullToPointer;
John McCall2de56d12010-08-25 11:45:40 +00005374 return CK_IntegralToPointer;
John McCalldaa8e4e2010-11-15 09:13:47 +00005375 case Type::STK_Bool:
5376 return CK_IntegralToBoolean;
5377 case Type::STK_Integral:
John McCallf3ea8cf2010-11-14 08:17:51 +00005378 return CK_IntegralCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00005379 case Type::STK_Floating:
John McCall2de56d12010-08-25 11:45:40 +00005380 return CK_IntegralToFloating;
John McCalldaa8e4e2010-11-15 09:13:47 +00005381 case Type::STK_IntegralComplex:
John Wiegley429bb272011-04-08 18:41:53 +00005382 Src = S.ImpCastExprToType(Src.take(), DestTy->getAs<ComplexType>()->getElementType(),
5383 CK_IntegralCast);
John McCallf3ea8cf2010-11-14 08:17:51 +00005384 return CK_IntegralRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00005385 case Type::STK_FloatingComplex:
John Wiegley429bb272011-04-08 18:41:53 +00005386 Src = S.ImpCastExprToType(Src.take(), DestTy->getAs<ComplexType>()->getElementType(),
5387 CK_IntegralToFloating);
John McCallf3ea8cf2010-11-14 08:17:51 +00005388 return CK_FloatingRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00005389 case Type::STK_MemberPointer:
5390 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00005391 }
5392 break;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005393
John McCalldaa8e4e2010-11-15 09:13:47 +00005394 case Type::STK_Floating:
5395 switch (DestTy->getScalarTypeKind()) {
5396 case Type::STK_Floating:
John McCall2de56d12010-08-25 11:45:40 +00005397 return CK_FloatingCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00005398 case Type::STK_Bool:
5399 return CK_FloatingToBoolean;
5400 case Type::STK_Integral:
John McCall2de56d12010-08-25 11:45:40 +00005401 return CK_FloatingToIntegral;
John McCalldaa8e4e2010-11-15 09:13:47 +00005402 case Type::STK_FloatingComplex:
John Wiegley429bb272011-04-08 18:41:53 +00005403 Src = S.ImpCastExprToType(Src.take(), DestTy->getAs<ComplexType>()->getElementType(),
5404 CK_FloatingCast);
John McCallf3ea8cf2010-11-14 08:17:51 +00005405 return CK_FloatingRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00005406 case Type::STK_IntegralComplex:
John Wiegley429bb272011-04-08 18:41:53 +00005407 Src = S.ImpCastExprToType(Src.take(), DestTy->getAs<ComplexType>()->getElementType(),
5408 CK_FloatingToIntegral);
John McCallf3ea8cf2010-11-14 08:17:51 +00005409 return CK_IntegralRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00005410 case Type::STK_Pointer:
5411 llvm_unreachable("valid float->pointer cast?");
5412 case Type::STK_MemberPointer:
5413 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00005414 }
5415 break;
5416
John McCalldaa8e4e2010-11-15 09:13:47 +00005417 case Type::STK_FloatingComplex:
5418 switch (DestTy->getScalarTypeKind()) {
5419 case Type::STK_FloatingComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00005420 return CK_FloatingComplexCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00005421 case Type::STK_IntegralComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00005422 return CK_FloatingComplexToIntegralComplex;
John McCall8786da72010-12-14 17:51:41 +00005423 case Type::STK_Floating: {
Abramo Bagnarabb03f5d2011-01-04 09:50:03 +00005424 QualType ET = SrcTy->getAs<ComplexType>()->getElementType();
John McCall8786da72010-12-14 17:51:41 +00005425 if (S.Context.hasSameType(ET, DestTy))
5426 return CK_FloatingComplexToReal;
John Wiegley429bb272011-04-08 18:41:53 +00005427 Src = S.ImpCastExprToType(Src.take(), ET, CK_FloatingComplexToReal);
John McCall8786da72010-12-14 17:51:41 +00005428 return CK_FloatingCast;
5429 }
John McCalldaa8e4e2010-11-15 09:13:47 +00005430 case Type::STK_Bool:
John McCallf3ea8cf2010-11-14 08:17:51 +00005431 return CK_FloatingComplexToBoolean;
John McCalldaa8e4e2010-11-15 09:13:47 +00005432 case Type::STK_Integral:
John Wiegley429bb272011-04-08 18:41:53 +00005433 Src = S.ImpCastExprToType(Src.take(), SrcTy->getAs<ComplexType>()->getElementType(),
5434 CK_FloatingComplexToReal);
John McCallf3ea8cf2010-11-14 08:17:51 +00005435 return CK_FloatingToIntegral;
John McCalldaa8e4e2010-11-15 09:13:47 +00005436 case Type::STK_Pointer:
5437 llvm_unreachable("valid complex float->pointer cast?");
5438 case Type::STK_MemberPointer:
5439 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00005440 }
5441 break;
5442
John McCalldaa8e4e2010-11-15 09:13:47 +00005443 case Type::STK_IntegralComplex:
5444 switch (DestTy->getScalarTypeKind()) {
5445 case Type::STK_FloatingComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00005446 return CK_IntegralComplexToFloatingComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00005447 case Type::STK_IntegralComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00005448 return CK_IntegralComplexCast;
John McCall8786da72010-12-14 17:51:41 +00005449 case Type::STK_Integral: {
Abramo Bagnarabb03f5d2011-01-04 09:50:03 +00005450 QualType ET = SrcTy->getAs<ComplexType>()->getElementType();
John McCall8786da72010-12-14 17:51:41 +00005451 if (S.Context.hasSameType(ET, DestTy))
5452 return CK_IntegralComplexToReal;
John Wiegley429bb272011-04-08 18:41:53 +00005453 Src = S.ImpCastExprToType(Src.take(), ET, CK_IntegralComplexToReal);
John McCall8786da72010-12-14 17:51:41 +00005454 return CK_IntegralCast;
5455 }
John McCalldaa8e4e2010-11-15 09:13:47 +00005456 case Type::STK_Bool:
John McCallf3ea8cf2010-11-14 08:17:51 +00005457 return CK_IntegralComplexToBoolean;
John McCalldaa8e4e2010-11-15 09:13:47 +00005458 case Type::STK_Floating:
John Wiegley429bb272011-04-08 18:41:53 +00005459 Src = S.ImpCastExprToType(Src.take(), SrcTy->getAs<ComplexType>()->getElementType(),
5460 CK_IntegralComplexToReal);
John McCallf3ea8cf2010-11-14 08:17:51 +00005461 return CK_IntegralToFloating;
John McCalldaa8e4e2010-11-15 09:13:47 +00005462 case Type::STK_Pointer:
5463 llvm_unreachable("valid complex int->pointer cast?");
5464 case Type::STK_MemberPointer:
5465 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00005466 }
5467 break;
Anders Carlsson82debc72009-10-18 18:12:03 +00005468 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005469
John McCallf3ea8cf2010-11-14 08:17:51 +00005470 llvm_unreachable("Unhandled scalar cast");
5471 return CK_BitCast;
Anders Carlsson82debc72009-10-18 18:12:03 +00005472}
5473
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00005474/// CheckCastTypes - Check type constraints for casting between types.
John McCallf85e1932011-06-15 23:02:42 +00005475ExprResult Sema::CheckCastTypes(SourceLocation CastStartLoc, SourceRange TyR,
5476 QualType castType, Expr *castExpr,
5477 CastKind& Kind, ExprValueKind &VK,
John Wiegley429bb272011-04-08 18:41:53 +00005478 CXXCastPath &BasePath, bool FunctionalStyle) {
John McCall1de4d4e2011-04-07 08:22:57 +00005479 if (castExpr->getType() == Context.UnknownAnyTy)
5480 return checkUnknownAnyCast(TyR, castType, castExpr, Kind, VK, BasePath);
5481
Sebastian Redl9cc11e72009-07-25 15:41:38 +00005482 if (getLangOptions().CPlusPlus)
John McCallf85e1932011-06-15 23:02:42 +00005483 return CXXCheckCStyleCast(SourceRange(CastStartLoc,
Douglas Gregor40749ee2010-11-03 00:35:38 +00005484 castExpr->getLocEnd()),
John McCallf89e55a2010-11-18 06:31:45 +00005485 castType, VK, castExpr, Kind, BasePath,
Anders Carlsson5cf86ba2010-04-24 19:06:50 +00005486 FunctionalStyle);
Sebastian Redl9cc11e72009-07-25 15:41:38 +00005487
John McCallfb8721c2011-04-10 19:13:55 +00005488 assert(!castExpr->getType()->isPlaceholderType());
5489
John McCallf89e55a2010-11-18 06:31:45 +00005490 // We only support r-value casts in C.
5491 VK = VK_RValue;
5492
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00005493 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression
5494 // type needs to be scalar.
5495 if (castType->isVoidType()) {
John McCallf6a16482010-12-04 03:47:34 +00005496 // We don't necessarily do lvalue-to-rvalue conversions on this.
John Wiegley429bb272011-04-08 18:41:53 +00005497 ExprResult castExprRes = IgnoredValueConversions(castExpr);
5498 if (castExprRes.isInvalid())
5499 return ExprError();
5500 castExpr = castExprRes.take();
John McCallf6a16482010-12-04 03:47:34 +00005501
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00005502 // Cast to void allows any expr type.
John McCall2de56d12010-08-25 11:45:40 +00005503 Kind = CK_ToVoid;
John Wiegley429bb272011-04-08 18:41:53 +00005504 return Owned(castExpr);
Anders Carlssonebeaf202009-10-16 02:35:04 +00005505 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005506
John Wiegley429bb272011-04-08 18:41:53 +00005507 ExprResult castExprRes = DefaultFunctionArrayLvalueConversion(castExpr);
5508 if (castExprRes.isInvalid())
5509 return ExprError();
5510 castExpr = castExprRes.take();
John McCallf6a16482010-12-04 03:47:34 +00005511
Eli Friedman8d438082010-07-17 20:43:49 +00005512 if (RequireCompleteType(TyR.getBegin(), castType,
5513 diag::err_typecheck_cast_to_incomplete))
John Wiegley429bb272011-04-08 18:41:53 +00005514 return ExprError();
Eli Friedman8d438082010-07-17 20:43:49 +00005515
Anders Carlssonebeaf202009-10-16 02:35:04 +00005516 if (!castType->isScalarType() && !castType->isVectorType()) {
Douglas Gregora4923eb2009-11-16 21:35:15 +00005517 if (Context.hasSameUnqualifiedType(castType, castExpr->getType()) &&
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00005518 (castType->isStructureType() || castType->isUnionType())) {
5519 // GCC struct/union extension: allow cast to self.
Eli Friedmanb1d796d2009-03-23 00:24:07 +00005520 // FIXME: Check that the cast destination type is complete.
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00005521 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar)
5522 << castType << castExpr->getSourceRange();
John McCall2de56d12010-08-25 11:45:40 +00005523 Kind = CK_NoOp;
John Wiegley429bb272011-04-08 18:41:53 +00005524 return Owned(castExpr);
Anders Carlssonc3516322009-10-16 02:48:28 +00005525 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005526
Anders Carlssonc3516322009-10-16 02:48:28 +00005527 if (castType->isUnionType()) {
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00005528 // GCC cast to union extension
Ted Kremenek6217b802009-07-29 21:53:49 +00005529 RecordDecl *RD = castType->getAs<RecordType>()->getDecl();
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00005530 RecordDecl::field_iterator Field, FieldEnd;
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00005531 for (Field = RD->field_begin(), FieldEnd = RD->field_end();
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00005532 Field != FieldEnd; ++Field) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005533 if (Context.hasSameUnqualifiedType(Field->getType(),
Abramo Bagnara8c4bfe52010-10-07 21:20:44 +00005534 castExpr->getType()) &&
5535 !Field->isUnnamedBitfield()) {
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00005536 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union)
5537 << castExpr->getSourceRange();
5538 break;
5539 }
5540 }
John Wiegley429bb272011-04-08 18:41:53 +00005541 if (Field == FieldEnd) {
5542 Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type)
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00005543 << castExpr->getType() << castExpr->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00005544 return ExprError();
5545 }
John McCall2de56d12010-08-25 11:45:40 +00005546 Kind = CK_ToUnion;
John Wiegley429bb272011-04-08 18:41:53 +00005547 return Owned(castExpr);
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00005548 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005549
Anders Carlssonc3516322009-10-16 02:48:28 +00005550 // Reject any other conversions to non-scalar types.
John Wiegley429bb272011-04-08 18:41:53 +00005551 Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar)
Anders Carlssonc3516322009-10-16 02:48:28 +00005552 << castType << castExpr->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00005553 return ExprError();
Anders Carlssonc3516322009-10-16 02:48:28 +00005554 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005555
John McCallf3ea8cf2010-11-14 08:17:51 +00005556 // The type we're casting to is known to be a scalar or vector.
5557
5558 // Require the operand to be a scalar or vector.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005559 if (!castExpr->getType()->isScalarType() &&
Anders Carlssonc3516322009-10-16 02:48:28 +00005560 !castExpr->getType()->isVectorType()) {
John Wiegley429bb272011-04-08 18:41:53 +00005561 Diag(castExpr->getLocStart(),
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00005562 diag::err_typecheck_expect_scalar_operand)
Chris Lattnerd1625842008-11-24 06:25:27 +00005563 << castExpr->getType() << castExpr->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00005564 return ExprError();
Anders Carlssonc3516322009-10-16 02:48:28 +00005565 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005566
5567 if (castType->isExtVectorType())
Anders Carlsson16a89042009-10-16 05:23:41 +00005568 return CheckExtVectorCast(TyR, castType, castExpr, Kind);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005569
Anton Yartsevd06fea82011-03-27 09:32:40 +00005570 if (castType->isVectorType()) {
5571 if (castType->getAs<VectorType>()->getVectorKind() ==
5572 VectorType::AltiVecVector &&
5573 (castExpr->getType()->isIntegerType() ||
5574 castExpr->getType()->isFloatingType())) {
5575 Kind = CK_VectorSplat;
John Wiegley429bb272011-04-08 18:41:53 +00005576 return Owned(castExpr);
5577 } else if (CheckVectorCast(TyR, castType, castExpr->getType(), Kind)) {
5578 return ExprError();
Anton Yartsevd06fea82011-03-27 09:32:40 +00005579 } else
John Wiegley429bb272011-04-08 18:41:53 +00005580 return Owned(castExpr);
Anton Yartsevd06fea82011-03-27 09:32:40 +00005581 }
John Wiegley429bb272011-04-08 18:41:53 +00005582 if (castExpr->getType()->isVectorType()) {
5583 if (CheckVectorCast(TyR, castExpr->getType(), castType, Kind))
5584 return ExprError();
5585 else
5586 return Owned(castExpr);
5587 }
Anders Carlssonc3516322009-10-16 02:48:28 +00005588
John McCallf3ea8cf2010-11-14 08:17:51 +00005589 // The source and target types are both scalars, i.e.
5590 // - arithmetic types (fundamental, enum, and complex)
5591 // - all kinds of pointers
5592 // Note that member pointers were filtered out with C++, above.
5593
John Wiegley429bb272011-04-08 18:41:53 +00005594 if (isa<ObjCSelectorExpr>(castExpr)) {
5595 Diag(castExpr->getLocStart(), diag::err_cast_selector_expr);
5596 return ExprError();
5597 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005598
John McCallf3ea8cf2010-11-14 08:17:51 +00005599 // If either type is a pointer, the other type has to be either an
5600 // integer or a pointer.
John McCallf85e1932011-06-15 23:02:42 +00005601 QualType castExprType = castExpr->getType();
Anders Carlssonc3516322009-10-16 02:48:28 +00005602 if (!castType->isArithmeticType()) {
Douglas Gregor9d3347a2010-06-16 00:35:25 +00005603 if (!castExprType->isIntegralType(Context) &&
John Wiegley429bb272011-04-08 18:41:53 +00005604 castExprType->isArithmeticType()) {
5605 Diag(castExpr->getLocStart(),
5606 diag::err_cast_pointer_from_non_pointer_int)
Eli Friedman41826bb2009-05-01 02:23:58 +00005607 << castExprType << castExpr->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00005608 return ExprError();
5609 }
Eli Friedman41826bb2009-05-01 02:23:58 +00005610 } else if (!castExpr->getType()->isArithmeticType()) {
John Wiegley429bb272011-04-08 18:41:53 +00005611 if (!castType->isIntegralType(Context) && castType->isArithmeticType()) {
5612 Diag(castExpr->getLocStart(), diag::err_cast_pointer_to_non_pointer_int)
Eli Friedman41826bb2009-05-01 02:23:58 +00005613 << castType << castExpr->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00005614 return ExprError();
5615 }
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00005616 }
Anders Carlsson82debc72009-10-18 18:12:03 +00005617
John McCallf85e1932011-06-15 23:02:42 +00005618 if (getLangOptions().ObjCAutoRefCount) {
5619 // Diagnose problems with Objective-C casts involving lifetime qualifiers.
5620 CheckObjCARCConversion(SourceRange(CastStartLoc, castExpr->getLocEnd()),
5621 castType, castExpr, CCK_CStyleCast);
5622
5623 if (const PointerType *CastPtr = castType->getAs<PointerType>()) {
5624 if (const PointerType *ExprPtr = castExprType->getAs<PointerType>()) {
5625 Qualifiers CastQuals = CastPtr->getPointeeType().getQualifiers();
5626 Qualifiers ExprQuals = ExprPtr->getPointeeType().getQualifiers();
5627 if (CastPtr->getPointeeType()->isObjCLifetimeType() &&
5628 ExprPtr->getPointeeType()->isObjCLifetimeType() &&
5629 !CastQuals.compatiblyIncludesObjCLifetime(ExprQuals)) {
5630 Diag(castExpr->getLocStart(),
5631 diag::err_typecheck_incompatible_lifetime)
5632 << castExprType << castType << AA_Casting
5633 << castExpr->getSourceRange();
5634
5635 return ExprError();
5636 }
5637 }
5638 }
5639 }
5640
John Wiegley429bb272011-04-08 18:41:53 +00005641 castExprRes = Owned(castExpr);
5642 Kind = PrepareScalarCast(*this, castExprRes, castType);
5643 if (castExprRes.isInvalid())
5644 return ExprError();
5645 castExpr = castExprRes.take();
John McCallb7f4ffe2010-08-12 21:44:57 +00005646
John McCallf3ea8cf2010-11-14 08:17:51 +00005647 if (Kind == CK_BitCast)
John McCallb7f4ffe2010-08-12 21:44:57 +00005648 CheckCastAlign(castExpr, castType, TyR);
5649
John Wiegley429bb272011-04-08 18:41:53 +00005650 return Owned(castExpr);
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00005651}
5652
Anders Carlssonc3516322009-10-16 02:48:28 +00005653bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty,
John McCall2de56d12010-08-25 11:45:40 +00005654 CastKind &Kind) {
Anders Carlssona64db8f2007-11-27 05:51:55 +00005655 assert(VectorTy->isVectorType() && "Not a vector type!");
Mike Stumpeed9cac2009-02-19 03:04:26 +00005656
Anders Carlssona64db8f2007-11-27 05:51:55 +00005657 if (Ty->isVectorType() || Ty->isIntegerType()) {
Chris Lattner98be4942008-03-05 18:54:05 +00005658 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty))
Anders Carlssona64db8f2007-11-27 05:51:55 +00005659 return Diag(R.getBegin(),
Mike Stumpeed9cac2009-02-19 03:04:26 +00005660 Ty->isVectorType() ?
Anders Carlssona64db8f2007-11-27 05:51:55 +00005661 diag::err_invalid_conversion_between_vectors :
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00005662 diag::err_invalid_conversion_between_vector_and_integer)
Chris Lattnerd1625842008-11-24 06:25:27 +00005663 << VectorTy << Ty << R;
Anders Carlssona64db8f2007-11-27 05:51:55 +00005664 } else
5665 return Diag(R.getBegin(),
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00005666 diag::err_invalid_conversion_between_vector_and_scalar)
Chris Lattnerd1625842008-11-24 06:25:27 +00005667 << VectorTy << Ty << R;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005668
John McCall2de56d12010-08-25 11:45:40 +00005669 Kind = CK_BitCast;
Anders Carlssona64db8f2007-11-27 05:51:55 +00005670 return false;
5671}
5672
John Wiegley429bb272011-04-08 18:41:53 +00005673ExprResult Sema::CheckExtVectorCast(SourceRange R, QualType DestTy,
5674 Expr *CastExpr, CastKind &Kind) {
Nate Begeman58d29a42009-06-26 00:50:28 +00005675 assert(DestTy->isExtVectorType() && "Not an extended vector type!");
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005676
Anders Carlsson16a89042009-10-16 05:23:41 +00005677 QualType SrcTy = CastExpr->getType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005678
Nate Begeman9b10da62009-06-27 22:05:55 +00005679 // If SrcTy is a VectorType, the total size must match to explicitly cast to
5680 // an ExtVectorType.
Nate Begeman58d29a42009-06-26 00:50:28 +00005681 if (SrcTy->isVectorType()) {
John Wiegley429bb272011-04-08 18:41:53 +00005682 if (Context.getTypeSize(DestTy) != Context.getTypeSize(SrcTy)) {
5683 Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors)
Nate Begeman58d29a42009-06-26 00:50:28 +00005684 << DestTy << SrcTy << R;
John Wiegley429bb272011-04-08 18:41:53 +00005685 return ExprError();
5686 }
John McCall2de56d12010-08-25 11:45:40 +00005687 Kind = CK_BitCast;
John Wiegley429bb272011-04-08 18:41:53 +00005688 return Owned(CastExpr);
Nate Begeman58d29a42009-06-26 00:50:28 +00005689 }
5690
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005691 // All non-pointer scalars can be cast to ExtVector type. The appropriate
Nate Begeman58d29a42009-06-26 00:50:28 +00005692 // conversion will take place first from scalar to elt type, and then
5693 // splat from elt type to vector.
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005694 if (SrcTy->isPointerType())
5695 return Diag(R.getBegin(),
5696 diag::err_invalid_conversion_between_vector_and_scalar)
5697 << DestTy << SrcTy << R;
Eli Friedman73c39ab2009-10-20 08:27:19 +00005698
5699 QualType DestElemTy = DestTy->getAs<ExtVectorType>()->getElementType();
John Wiegley429bb272011-04-08 18:41:53 +00005700 ExprResult CastExprRes = Owned(CastExpr);
5701 CastKind CK = PrepareScalarCast(*this, CastExprRes, DestElemTy);
5702 if (CastExprRes.isInvalid())
5703 return ExprError();
5704 CastExpr = ImpCastExprToType(CastExprRes.take(), DestElemTy, CK).take();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005705
John McCall2de56d12010-08-25 11:45:40 +00005706 Kind = CK_VectorSplat;
John Wiegley429bb272011-04-08 18:41:53 +00005707 return Owned(CastExpr);
Nate Begeman58d29a42009-06-26 00:50:28 +00005708}
5709
John McCall60d7b3a2010-08-24 06:29:42 +00005710ExprResult
John McCallb3d87482010-08-24 05:47:05 +00005711Sema::ActOnCastExpr(Scope *S, SourceLocation LParenLoc, ParsedType Ty,
John McCall9ae2f072010-08-23 23:25:46 +00005712 SourceLocation RParenLoc, Expr *castExpr) {
5713 assert((Ty != 0) && (castExpr != 0) &&
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005714 "ActOnCastExpr(): missing type or expr");
Steve Naroff16beff82007-07-16 23:25:18 +00005715
John McCall9d125032010-01-15 18:39:57 +00005716 TypeSourceInfo *castTInfo;
5717 QualType castType = GetTypeFromParser(Ty, &castTInfo);
5718 if (!castTInfo)
John McCall42f56b52010-01-18 19:35:47 +00005719 castTInfo = Context.getTrivialTypeSourceInfo(castType);
Mike Stump1eb44332009-09-09 15:08:12 +00005720
Nate Begeman2ef13e52009-08-10 23:49:36 +00005721 // If the Expr being casted is a ParenListExpr, handle it specially.
5722 if (isa<ParenListExpr>(castExpr))
John McCall9ae2f072010-08-23 23:25:46 +00005723 return ActOnCastOfParenListExpr(S, LParenLoc, RParenLoc, castExpr,
John McCall42f56b52010-01-18 19:35:47 +00005724 castTInfo);
John McCallb042fdf2010-01-15 18:56:44 +00005725
John McCall9ae2f072010-08-23 23:25:46 +00005726 return BuildCStyleCastExpr(LParenLoc, castTInfo, RParenLoc, castExpr);
John McCallb042fdf2010-01-15 18:56:44 +00005727}
5728
John McCall60d7b3a2010-08-24 06:29:42 +00005729ExprResult
John McCallb042fdf2010-01-15 18:56:44 +00005730Sema::BuildCStyleCastExpr(SourceLocation LParenLoc, TypeSourceInfo *Ty,
John McCall9ae2f072010-08-23 23:25:46 +00005731 SourceLocation RParenLoc, Expr *castExpr) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005732 CastKind Kind = CK_Invalid;
John McCallf89e55a2010-11-18 06:31:45 +00005733 ExprValueKind VK = VK_RValue;
John McCallf871d0c2010-08-07 06:22:56 +00005734 CXXCastPath BasePath;
John Wiegley429bb272011-04-08 18:41:53 +00005735 ExprResult CastResult =
John McCallf85e1932011-06-15 23:02:42 +00005736 CheckCastTypes(LParenLoc, SourceRange(LParenLoc, RParenLoc), Ty->getType(),
5737 castExpr, Kind, VK, BasePath);
John Wiegley429bb272011-04-08 18:41:53 +00005738 if (CastResult.isInvalid())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005739 return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00005740 castExpr = CastResult.take();
Anders Carlsson0aebc812009-09-09 21:33:21 +00005741
John McCallf871d0c2010-08-07 06:22:56 +00005742 return Owned(CStyleCastExpr::Create(Context,
John Wiegley429bb272011-04-08 18:41:53 +00005743 Ty->getType().getNonLValueExprType(Context),
John McCallf89e55a2010-11-18 06:31:45 +00005744 VK, Kind, castExpr, &BasePath, Ty,
John McCallf871d0c2010-08-07 06:22:56 +00005745 LParenLoc, RParenLoc));
Reid Spencer5f016e22007-07-11 17:01:13 +00005746}
5747
Nate Begeman2ef13e52009-08-10 23:49:36 +00005748/// This is not an AltiVec-style cast, so turn the ParenListExpr into a sequence
5749/// of comma binary operators.
John McCall60d7b3a2010-08-24 06:29:42 +00005750ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00005751Sema::MaybeConvertParenListExprToParenExpr(Scope *S, Expr *expr) {
Nate Begeman2ef13e52009-08-10 23:49:36 +00005752 ParenListExpr *E = dyn_cast<ParenListExpr>(expr);
5753 if (!E)
5754 return Owned(expr);
Mike Stump1eb44332009-09-09 15:08:12 +00005755
John McCall60d7b3a2010-08-24 06:29:42 +00005756 ExprResult Result(E->getExpr(0));
Mike Stump1eb44332009-09-09 15:08:12 +00005757
Nate Begeman2ef13e52009-08-10 23:49:36 +00005758 for (unsigned i = 1, e = E->getNumExprs(); i != e && !Result.isInvalid(); ++i)
John McCall9ae2f072010-08-23 23:25:46 +00005759 Result = ActOnBinOp(S, E->getExprLoc(), tok::comma, Result.get(),
5760 E->getExpr(i));
Mike Stump1eb44332009-09-09 15:08:12 +00005761
John McCall9ae2f072010-08-23 23:25:46 +00005762 if (Result.isInvalid()) return ExprError();
5763
5764 return ActOnParenExpr(E->getLParenLoc(), E->getRParenLoc(), Result.get());
Nate Begeman2ef13e52009-08-10 23:49:36 +00005765}
5766
John McCall60d7b3a2010-08-24 06:29:42 +00005767ExprResult
Nate Begeman2ef13e52009-08-10 23:49:36 +00005768Sema::ActOnCastOfParenListExpr(Scope *S, SourceLocation LParenLoc,
John McCall9ae2f072010-08-23 23:25:46 +00005769 SourceLocation RParenLoc, Expr *Op,
John McCall42f56b52010-01-18 19:35:47 +00005770 TypeSourceInfo *TInfo) {
John McCall9ae2f072010-08-23 23:25:46 +00005771 ParenListExpr *PE = cast<ParenListExpr>(Op);
John McCall42f56b52010-01-18 19:35:47 +00005772 QualType Ty = TInfo->getType();
Anton Yartsevd06fea82011-03-27 09:32:40 +00005773 bool isVectorLiteral = false;
Mike Stump1eb44332009-09-09 15:08:12 +00005774
Anton Yartsevd06fea82011-03-27 09:32:40 +00005775 // Check for an altivec or OpenCL literal,
John Thompson8bb59a82010-06-30 22:55:51 +00005776 // i.e. all the elements are integer constants.
Nate Begeman2ef13e52009-08-10 23:49:36 +00005777 if (getLangOptions().AltiVec && Ty->isVectorType()) {
5778 if (PE->getNumExprs() == 0) {
5779 Diag(PE->getExprLoc(), diag::err_altivec_empty_initializer);
5780 return ExprError();
5781 }
John Thompson8bb59a82010-06-30 22:55:51 +00005782 if (PE->getNumExprs() == 1) {
5783 if (!PE->getExpr(0)->getType()->isVectorType())
Anton Yartsevd06fea82011-03-27 09:32:40 +00005784 isVectorLiteral = true;
John Thompson8bb59a82010-06-30 22:55:51 +00005785 }
5786 else
Anton Yartsevd06fea82011-03-27 09:32:40 +00005787 isVectorLiteral = true;
John Thompson8bb59a82010-06-30 22:55:51 +00005788 }
Nate Begeman2ef13e52009-08-10 23:49:36 +00005789
Anton Yartsevd06fea82011-03-27 09:32:40 +00005790 // If this is a vector initializer, '(' type ')' '(' init, ..., init ')'
John Thompson8bb59a82010-06-30 22:55:51 +00005791 // then handle it as such.
Anton Yartsevd06fea82011-03-27 09:32:40 +00005792 if (isVectorLiteral) {
Nate Begeman2ef13e52009-08-10 23:49:36 +00005793 llvm::SmallVector<Expr *, 8> initExprs;
Anton Yartsevd06fea82011-03-27 09:32:40 +00005794 // '(...)' form of vector initialization in AltiVec: the number of
5795 // initializers must be one or must match the size of the vector.
5796 // If a single value is specified in the initializer then it will be
5797 // replicated to all the components of the vector
5798 if (Ty->getAs<VectorType>()->getVectorKind() ==
5799 VectorType::AltiVecVector) {
5800 unsigned numElems = Ty->getAs<VectorType>()->getNumElements();
5801 // The number of initializers must be one or must match the size of the
5802 // vector. If a single value is specified in the initializer then it will
5803 // be replicated to all the components of the vector
5804 if (PE->getNumExprs() == 1) {
5805 QualType ElemTy = Ty->getAs<VectorType>()->getElementType();
John Wiegley429bb272011-04-08 18:41:53 +00005806 ExprResult Literal = Owned(PE->getExpr(0));
5807 Literal = ImpCastExprToType(Literal.take(), ElemTy,
5808 PrepareScalarCast(*this, Literal, ElemTy));
5809 return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Literal.take());
Anton Yartsevd06fea82011-03-27 09:32:40 +00005810 }
5811 else if (PE->getNumExprs() < numElems) {
5812 Diag(PE->getExprLoc(),
5813 diag::err_incorrect_number_of_vector_initializers);
5814 return ExprError();
5815 }
5816 else
5817 for (unsigned i = 0, e = PE->getNumExprs(); i != e; ++i)
5818 initExprs.push_back(PE->getExpr(i));
5819 }
5820 else
5821 for (unsigned i = 0, e = PE->getNumExprs(); i != e; ++i)
5822 initExprs.push_back(PE->getExpr(i));
Nate Begeman2ef13e52009-08-10 23:49:36 +00005823
5824 // FIXME: This means that pretty-printing the final AST will produce curly
5825 // braces instead of the original commas.
Ted Kremenek709210f2010-04-13 23:39:13 +00005826 InitListExpr *E = new (Context) InitListExpr(Context, LParenLoc,
5827 &initExprs[0],
Nate Begeman2ef13e52009-08-10 23:49:36 +00005828 initExprs.size(), RParenLoc);
5829 E->setType(Ty);
John McCall9ae2f072010-08-23 23:25:46 +00005830 return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, E);
Nate Begeman2ef13e52009-08-10 23:49:36 +00005831 } else {
Mike Stump1eb44332009-09-09 15:08:12 +00005832 // This is not an AltiVec-style cast, so turn the ParenListExpr into a
Nate Begeman2ef13e52009-08-10 23:49:36 +00005833 // sequence of BinOp comma operators.
John McCall60d7b3a2010-08-24 06:29:42 +00005834 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Op);
John McCall9ae2f072010-08-23 23:25:46 +00005835 if (Result.isInvalid()) return ExprError();
5836 return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Result.take());
Nate Begeman2ef13e52009-08-10 23:49:36 +00005837 }
5838}
5839
John McCall60d7b3a2010-08-24 06:29:42 +00005840ExprResult Sema::ActOnParenOrParenListExpr(SourceLocation L,
Nate Begeman2ef13e52009-08-10 23:49:36 +00005841 SourceLocation R,
Fariborz Jahanianf88f7ab2009-11-25 01:26:41 +00005842 MultiExprArg Val,
John McCallb3d87482010-08-24 05:47:05 +00005843 ParsedType TypeOfCast) {
Nate Begeman2ef13e52009-08-10 23:49:36 +00005844 unsigned nexprs = Val.size();
5845 Expr **exprs = reinterpret_cast<Expr**>(Val.release());
Fariborz Jahanianf88f7ab2009-11-25 01:26:41 +00005846 assert((exprs != 0) && "ActOnParenOrParenListExpr() missing expr list");
5847 Expr *expr;
5848 if (nexprs == 1 && TypeOfCast && !TypeIsVectorType(TypeOfCast))
5849 expr = new (Context) ParenExpr(L, R, exprs[0]);
5850 else
Manuel Klimek0d9106f2011-06-22 20:02:16 +00005851 expr = new (Context) ParenListExpr(Context, L, exprs, nexprs, R,
5852 exprs[nexprs-1]->getType());
Nate Begeman2ef13e52009-08-10 23:49:36 +00005853 return Owned(expr);
5854}
5855
Chandler Carruth82214a82011-02-18 23:54:50 +00005856/// \brief Emit a specialized diagnostic when one expression is a null pointer
5857/// constant and the other is not a pointer.
5858bool Sema::DiagnoseConditionalForNull(Expr *LHS, Expr *RHS,
5859 SourceLocation QuestionLoc) {
5860 Expr *NullExpr = LHS;
5861 Expr *NonPointerExpr = RHS;
5862 Expr::NullPointerConstantKind NullKind =
5863 NullExpr->isNullPointerConstant(Context,
5864 Expr::NPC_ValueDependentIsNotNull);
5865
5866 if (NullKind == Expr::NPCK_NotNull) {
5867 NullExpr = RHS;
5868 NonPointerExpr = LHS;
5869 NullKind =
5870 NullExpr->isNullPointerConstant(Context,
5871 Expr::NPC_ValueDependentIsNotNull);
5872 }
5873
5874 if (NullKind == Expr::NPCK_NotNull)
5875 return false;
5876
5877 if (NullKind == Expr::NPCK_ZeroInteger) {
5878 // In this case, check to make sure that we got here from a "NULL"
5879 // string in the source code.
5880 NullExpr = NullExpr->IgnoreParenImpCasts();
John McCall834e3f62011-03-08 07:59:04 +00005881 SourceLocation loc = NullExpr->getExprLoc();
5882 if (!findMacroSpelling(loc, "NULL"))
Chandler Carruth82214a82011-02-18 23:54:50 +00005883 return false;
5884 }
5885
5886 int DiagType = (NullKind == Expr::NPCK_CXX0X_nullptr);
5887 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands_null)
5888 << NonPointerExpr->getType() << DiagType
5889 << NonPointerExpr->getSourceRange();
5890 return true;
5891}
5892
Sebastian Redl28507842009-02-26 14:39:58 +00005893/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension.
5894/// In that case, lhs = cond.
Chris Lattnera119a3b2009-02-18 04:38:20 +00005895/// C99 6.5.15
John Wiegley429bb272011-04-08 18:41:53 +00005896QualType Sema::CheckConditionalOperands(ExprResult &Cond, ExprResult &LHS, ExprResult &RHS,
John McCall56ca35d2011-02-17 10:25:35 +00005897 ExprValueKind &VK, ExprObjectKind &OK,
Chris Lattnera119a3b2009-02-18 04:38:20 +00005898 SourceLocation QuestionLoc) {
Douglas Gregorfadb53b2011-03-12 01:48:56 +00005899
John McCallfb8721c2011-04-10 19:13:55 +00005900 ExprResult lhsResult = CheckPlaceholderExpr(LHS.get());
John McCall1de4d4e2011-04-07 08:22:57 +00005901 if (!lhsResult.isUsable()) return QualType();
John Wiegley429bb272011-04-08 18:41:53 +00005902 LHS = move(lhsResult);
Douglas Gregor7ad5d422010-11-09 21:07:58 +00005903
John McCallfb8721c2011-04-10 19:13:55 +00005904 ExprResult rhsResult = CheckPlaceholderExpr(RHS.get());
John McCall1de4d4e2011-04-07 08:22:57 +00005905 if (!rhsResult.isUsable()) return QualType();
John Wiegley429bb272011-04-08 18:41:53 +00005906 RHS = move(rhsResult);
Douglas Gregor7ad5d422010-11-09 21:07:58 +00005907
Sebastian Redl3201f6b2009-04-16 17:51:27 +00005908 // C++ is sufficiently different to merit its own checker.
5909 if (getLangOptions().CPlusPlus)
John McCall56ca35d2011-02-17 10:25:35 +00005910 return CXXCheckConditionalOperands(Cond, LHS, RHS, VK, OK, QuestionLoc);
John McCallf89e55a2010-11-18 06:31:45 +00005911
5912 VK = VK_RValue;
John McCall09431682010-11-18 19:01:18 +00005913 OK = OK_Ordinary;
Sebastian Redl3201f6b2009-04-16 17:51:27 +00005914
John Wiegley429bb272011-04-08 18:41:53 +00005915 Cond = UsualUnaryConversions(Cond.take());
5916 if (Cond.isInvalid())
5917 return QualType();
5918 LHS = UsualUnaryConversions(LHS.take());
5919 if (LHS.isInvalid())
5920 return QualType();
5921 RHS = UsualUnaryConversions(RHS.take());
5922 if (RHS.isInvalid())
5923 return QualType();
5924
5925 QualType CondTy = Cond.get()->getType();
5926 QualType LHSTy = LHS.get()->getType();
5927 QualType RHSTy = RHS.get()->getType();
Steve Naroffc80b4ee2007-07-16 21:54:35 +00005928
Reid Spencer5f016e22007-07-11 17:01:13 +00005929 // first, check the condition.
Sebastian Redl3201f6b2009-04-16 17:51:27 +00005930 if (!CondTy->isScalarType()) { // C99 6.5.15p2
Nate Begeman6155d732010-09-20 22:41:17 +00005931 // OpenCL: Sec 6.3.i says the condition is allowed to be a vector or scalar.
5932 // Throw an error if its not either.
5933 if (getLangOptions().OpenCL) {
5934 if (!CondTy->isVectorType()) {
John Wiegley429bb272011-04-08 18:41:53 +00005935 Diag(Cond.get()->getLocStart(),
Nate Begeman6155d732010-09-20 22:41:17 +00005936 diag::err_typecheck_cond_expect_scalar_or_vector)
5937 << CondTy;
5938 return QualType();
5939 }
5940 }
5941 else {
John Wiegley429bb272011-04-08 18:41:53 +00005942 Diag(Cond.get()->getLocStart(), diag::err_typecheck_cond_expect_scalar)
Nate Begeman6155d732010-09-20 22:41:17 +00005943 << CondTy;
5944 return QualType();
5945 }
Reid Spencer5f016e22007-07-11 17:01:13 +00005946 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005947
Chris Lattner70d67a92008-01-06 22:42:25 +00005948 // Now check the two expressions.
Nate Begeman2ef13e52009-08-10 23:49:36 +00005949 if (LHSTy->isVectorType() || RHSTy->isVectorType())
5950 return CheckVectorOperands(QuestionLoc, LHS, RHS);
Douglas Gregor898574e2008-12-05 23:32:09 +00005951
Nate Begeman6155d732010-09-20 22:41:17 +00005952 // OpenCL: If the condition is a vector, and both operands are scalar,
5953 // attempt to implicity convert them to the vector type to act like the
5954 // built in select.
5955 if (getLangOptions().OpenCL && CondTy->isVectorType()) {
5956 // Both operands should be of scalar type.
5957 if (!LHSTy->isScalarType()) {
John Wiegley429bb272011-04-08 18:41:53 +00005958 Diag(LHS.get()->getLocStart(), diag::err_typecheck_cond_expect_scalar)
Nate Begeman6155d732010-09-20 22:41:17 +00005959 << CondTy;
5960 return QualType();
5961 }
5962 if (!RHSTy->isScalarType()) {
John Wiegley429bb272011-04-08 18:41:53 +00005963 Diag(RHS.get()->getLocStart(), diag::err_typecheck_cond_expect_scalar)
Nate Begeman6155d732010-09-20 22:41:17 +00005964 << CondTy;
5965 return QualType();
5966 }
5967 // Implicity convert these scalars to the type of the condition.
John Wiegley429bb272011-04-08 18:41:53 +00005968 LHS = ImpCastExprToType(LHS.take(), CondTy, CK_IntegralCast);
5969 RHS = ImpCastExprToType(RHS.take(), CondTy, CK_IntegralCast);
Nate Begeman6155d732010-09-20 22:41:17 +00005970 }
5971
Chris Lattner70d67a92008-01-06 22:42:25 +00005972 // If both operands have arithmetic type, do the usual arithmetic conversions
5973 // to find a common type: C99 6.5.15p3,5.
Chris Lattnerefdc39d2009-02-18 04:28:32 +00005974 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) {
5975 UsualArithmeticConversions(LHS, RHS);
John Wiegley429bb272011-04-08 18:41:53 +00005976 if (LHS.isInvalid() || RHS.isInvalid())
5977 return QualType();
5978 return LHS.get()->getType();
Steve Naroffa4332e22007-07-17 00:58:39 +00005979 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005980
Chris Lattner70d67a92008-01-06 22:42:25 +00005981 // If both operands are the same structure or union type, the result is that
5982 // type.
Ted Kremenek6217b802009-07-29 21:53:49 +00005983 if (const RecordType *LHSRT = LHSTy->getAs<RecordType>()) { // C99 6.5.15p3
5984 if (const RecordType *RHSRT = RHSTy->getAs<RecordType>())
Chris Lattnera21ddb32007-11-26 01:40:58 +00005985 if (LHSRT->getDecl() == RHSRT->getDecl())
Mike Stumpeed9cac2009-02-19 03:04:26 +00005986 // "If both the operands have structure or union type, the result has
Chris Lattner70d67a92008-01-06 22:42:25 +00005987 // that type." This implies that CV qualifiers are dropped.
Chris Lattnerefdc39d2009-02-18 04:28:32 +00005988 return LHSTy.getUnqualifiedType();
Eli Friedmanb1d796d2009-03-23 00:24:07 +00005989 // FIXME: Type of conditional expression must be complete in C mode.
Reid Spencer5f016e22007-07-11 17:01:13 +00005990 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005991
Chris Lattner70d67a92008-01-06 22:42:25 +00005992 // C99 6.5.15p5: "If both operands have void type, the result has void type."
Steve Naroffe701c0a2008-05-12 21:44:38 +00005993 // The following || allows only one side to be void (a GCC-ism).
Chris Lattnerefdc39d2009-02-18 04:28:32 +00005994 if (LHSTy->isVoidType() || RHSTy->isVoidType()) {
5995 if (!LHSTy->isVoidType())
John Wiegley429bb272011-04-08 18:41:53 +00005996 Diag(RHS.get()->getLocStart(), diag::ext_typecheck_cond_one_void)
5997 << RHS.get()->getSourceRange();
Chris Lattnerefdc39d2009-02-18 04:28:32 +00005998 if (!RHSTy->isVoidType())
John Wiegley429bb272011-04-08 18:41:53 +00005999 Diag(LHS.get()->getLocStart(), diag::ext_typecheck_cond_one_void)
6000 << LHS.get()->getSourceRange();
6001 LHS = ImpCastExprToType(LHS.take(), Context.VoidTy, CK_ToVoid);
6002 RHS = ImpCastExprToType(RHS.take(), Context.VoidTy, CK_ToVoid);
Eli Friedman0e724012008-06-04 19:47:51 +00006003 return Context.VoidTy;
Steve Naroffe701c0a2008-05-12 21:44:38 +00006004 }
Steve Naroffb6d54e52008-01-08 01:11:38 +00006005 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has
6006 // the type of the other operand."
Steve Naroff58f9f2c2009-07-14 18:25:06 +00006007 if ((LHSTy->isAnyPointerType() || LHSTy->isBlockPointerType()) &&
John Wiegley429bb272011-04-08 18:41:53 +00006008 RHS.get()->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
Eli Friedman73c39ab2009-10-20 08:27:19 +00006009 // promote the null to a pointer.
John Wiegley429bb272011-04-08 18:41:53 +00006010 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_NullToPointer);
Chris Lattnerefdc39d2009-02-18 04:28:32 +00006011 return LHSTy;
Steve Naroffb6d54e52008-01-08 01:11:38 +00006012 }
Steve Naroff58f9f2c2009-07-14 18:25:06 +00006013 if ((RHSTy->isAnyPointerType() || RHSTy->isBlockPointerType()) &&
John Wiegley429bb272011-04-08 18:41:53 +00006014 LHS.get()->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
6015 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_NullToPointer);
Chris Lattnerefdc39d2009-02-18 04:28:32 +00006016 return RHSTy;
Steve Naroffb6d54e52008-01-08 01:11:38 +00006017 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006018
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006019 // All objective-c pointer type analysis is done here.
6020 QualType compositeType = FindCompositeObjCPointerType(LHS, RHS,
6021 QuestionLoc);
John Wiegley429bb272011-04-08 18:41:53 +00006022 if (LHS.isInvalid() || RHS.isInvalid())
6023 return QualType();
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006024 if (!compositeType.isNull())
6025 return compositeType;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006026
6027
Steve Naroff7154a772009-07-01 14:36:47 +00006028 // Handle block pointer types.
6029 if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType()) {
6030 if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) {
6031 if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) {
6032 QualType destType = Context.getPointerType(Context.VoidTy);
John Wiegley429bb272011-04-08 18:41:53 +00006033 LHS = ImpCastExprToType(LHS.take(), destType, CK_BitCast);
6034 RHS = ImpCastExprToType(RHS.take(), destType, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00006035 return destType;
6036 }
6037 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
John Wiegley429bb272011-04-08 18:41:53 +00006038 << LHSTy << RHSTy << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Steve Naroff7154a772009-07-01 14:36:47 +00006039 return QualType();
Mike Stumpdd3e1662009-05-07 03:14:14 +00006040 }
Steve Naroff7154a772009-07-01 14:36:47 +00006041 // We have 2 block pointer types.
6042 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
6043 // Two identical block pointer types are always compatible.
Mike Stumpdd3e1662009-05-07 03:14:14 +00006044 return LHSTy;
6045 }
Steve Naroff7154a772009-07-01 14:36:47 +00006046 // The block pointer types aren't identical, continue checking.
Ted Kremenek6217b802009-07-29 21:53:49 +00006047 QualType lhptee = LHSTy->getAs<BlockPointerType>()->getPointeeType();
6048 QualType rhptee = RHSTy->getAs<BlockPointerType>()->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006049
Steve Naroff7154a772009-07-01 14:36:47 +00006050 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(),
6051 rhptee.getUnqualifiedType())) {
Mike Stumpdd3e1662009-05-07 03:14:14 +00006052 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers)
John Wiegley429bb272011-04-08 18:41:53 +00006053 << LHSTy << RHSTy << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Mike Stumpdd3e1662009-05-07 03:14:14 +00006054 // In this situation, we assume void* type. No especially good
6055 // reason, but this is what gcc does, and we do have to pick
6056 // to get a consistent AST.
6057 QualType incompatTy = Context.getPointerType(Context.VoidTy);
John Wiegley429bb272011-04-08 18:41:53 +00006058 LHS = ImpCastExprToType(LHS.take(), incompatTy, CK_BitCast);
6059 RHS = ImpCastExprToType(RHS.take(), incompatTy, CK_BitCast);
Mike Stumpdd3e1662009-05-07 03:14:14 +00006060 return incompatTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00006061 }
Steve Naroff7154a772009-07-01 14:36:47 +00006062 // The block pointer types are compatible.
John Wiegley429bb272011-04-08 18:41:53 +00006063 LHS = ImpCastExprToType(LHS.take(), LHSTy, CK_BitCast);
6064 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
Steve Naroff91588042009-04-08 17:05:15 +00006065 return LHSTy;
6066 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006067
Steve Naroff7154a772009-07-01 14:36:47 +00006068 // Check constraints for C object pointers types (C99 6.5.15p3,6).
6069 if (LHSTy->isPointerType() && RHSTy->isPointerType()) {
6070 // get the "pointed to" types
Ted Kremenek6217b802009-07-29 21:53:49 +00006071 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
6072 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
Steve Naroff7154a772009-07-01 14:36:47 +00006073
6074 // ignore qualifiers on void (C99 6.5.15p3, clause 6)
6075 if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) {
6076 // Figure out necessary qualifiers (C99 6.5.15p6)
John McCall0953e762009-09-24 19:53:00 +00006077 QualType destPointee
6078 = Context.getQualifiedType(lhptee, rhptee.getQualifiers());
Steve Naroff7154a772009-07-01 14:36:47 +00006079 QualType destType = Context.getPointerType(destPointee);
Eli Friedman73c39ab2009-10-20 08:27:19 +00006080 // Add qualifiers if necessary.
John Wiegley429bb272011-04-08 18:41:53 +00006081 LHS = ImpCastExprToType(LHS.take(), destType, CK_NoOp);
Eli Friedman73c39ab2009-10-20 08:27:19 +00006082 // Promote to void*.
John Wiegley429bb272011-04-08 18:41:53 +00006083 RHS = ImpCastExprToType(RHS.take(), destType, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00006084 return destType;
6085 }
6086 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) {
John McCall0953e762009-09-24 19:53:00 +00006087 QualType destPointee
6088 = Context.getQualifiedType(rhptee, lhptee.getQualifiers());
Steve Naroff7154a772009-07-01 14:36:47 +00006089 QualType destType = Context.getPointerType(destPointee);
Eli Friedman73c39ab2009-10-20 08:27:19 +00006090 // Add qualifiers if necessary.
John Wiegley429bb272011-04-08 18:41:53 +00006091 RHS = ImpCastExprToType(RHS.take(), destType, CK_NoOp);
Eli Friedman73c39ab2009-10-20 08:27:19 +00006092 // Promote to void*.
John Wiegley429bb272011-04-08 18:41:53 +00006093 LHS = ImpCastExprToType(LHS.take(), destType, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00006094 return destType;
6095 }
6096
6097 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
6098 // Two identical pointer types are always compatible.
6099 return LHSTy;
6100 }
6101 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(),
6102 rhptee.getUnqualifiedType())) {
6103 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers)
John Wiegley429bb272011-04-08 18:41:53 +00006104 << LHSTy << RHSTy << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Steve Naroff7154a772009-07-01 14:36:47 +00006105 // In this situation, we assume void* type. No especially good
6106 // reason, but this is what gcc does, and we do have to pick
6107 // to get a consistent AST.
6108 QualType incompatTy = Context.getPointerType(Context.VoidTy);
John Wiegley429bb272011-04-08 18:41:53 +00006109 LHS = ImpCastExprToType(LHS.take(), incompatTy, CK_BitCast);
6110 RHS = ImpCastExprToType(RHS.take(), incompatTy, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00006111 return incompatTy;
6112 }
6113 // The pointer types are compatible.
6114 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to
6115 // differently qualified versions of compatible types, the result type is
6116 // a pointer to an appropriately qualified version of the *composite*
6117 // type.
6118 // FIXME: Need to calculate the composite type.
6119 // FIXME: Need to add qualifiers
John Wiegley429bb272011-04-08 18:41:53 +00006120 LHS = ImpCastExprToType(LHS.take(), LHSTy, CK_BitCast);
6121 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00006122 return LHSTy;
6123 }
Mike Stump1eb44332009-09-09 15:08:12 +00006124
John McCall404cd162010-11-13 01:35:44 +00006125 // GCC compatibility: soften pointer/integer mismatch. Note that
6126 // null pointers have been filtered out by this point.
Steve Naroff7154a772009-07-01 14:36:47 +00006127 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) {
6128 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch)
John Wiegley429bb272011-04-08 18:41:53 +00006129 << LHSTy << RHSTy << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
6130 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_IntegralToPointer);
Steve Naroff7154a772009-07-01 14:36:47 +00006131 return RHSTy;
6132 }
6133 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) {
6134 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch)
John Wiegley429bb272011-04-08 18:41:53 +00006135 << LHSTy << RHSTy << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
6136 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_IntegralToPointer);
Steve Naroff7154a772009-07-01 14:36:47 +00006137 return LHSTy;
6138 }
Daniel Dunbar5e155f02008-09-11 23:12:46 +00006139
Chandler Carruth82214a82011-02-18 23:54:50 +00006140 // Emit a better diagnostic if one of the expressions is a null pointer
6141 // constant and the other is not a pointer type. In this case, the user most
6142 // likely forgot to take the address of the other expression.
John Wiegley429bb272011-04-08 18:41:53 +00006143 if (DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
Chandler Carruth82214a82011-02-18 23:54:50 +00006144 return QualType();
6145
Chris Lattner70d67a92008-01-06 22:42:25 +00006146 // Otherwise, the operands are not compatible.
Chris Lattnerefdc39d2009-02-18 04:28:32 +00006147 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
John Wiegley429bb272011-04-08 18:41:53 +00006148 << LHSTy << RHSTy << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00006149 return QualType();
6150}
6151
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006152/// FindCompositeObjCPointerType - Helper method to find composite type of
6153/// two objective-c pointer types of the two input expressions.
John Wiegley429bb272011-04-08 18:41:53 +00006154QualType Sema::FindCompositeObjCPointerType(ExprResult &LHS, ExprResult &RHS,
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006155 SourceLocation QuestionLoc) {
John Wiegley429bb272011-04-08 18:41:53 +00006156 QualType LHSTy = LHS.get()->getType();
6157 QualType RHSTy = RHS.get()->getType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006158
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006159 // Handle things like Class and struct objc_class*. Here we case the result
6160 // to the pseudo-builtin, because that will be implicitly cast back to the
6161 // redefinition type if an attempt is made to access its fields.
6162 if (LHSTy->isObjCClassType() &&
John McCall49f4e1c2010-12-10 11:01:00 +00006163 (Context.hasSameType(RHSTy, Context.ObjCClassRedefinitionType))) {
John Wiegley429bb272011-04-08 18:41:53 +00006164 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006165 return LHSTy;
6166 }
6167 if (RHSTy->isObjCClassType() &&
John McCall49f4e1c2010-12-10 11:01:00 +00006168 (Context.hasSameType(LHSTy, Context.ObjCClassRedefinitionType))) {
John Wiegley429bb272011-04-08 18:41:53 +00006169 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006170 return RHSTy;
6171 }
6172 // And the same for struct objc_object* / id
6173 if (LHSTy->isObjCIdType() &&
John McCall49f4e1c2010-12-10 11:01:00 +00006174 (Context.hasSameType(RHSTy, Context.ObjCIdRedefinitionType))) {
John Wiegley429bb272011-04-08 18:41:53 +00006175 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006176 return LHSTy;
6177 }
6178 if (RHSTy->isObjCIdType() &&
John McCall49f4e1c2010-12-10 11:01:00 +00006179 (Context.hasSameType(LHSTy, Context.ObjCIdRedefinitionType))) {
John Wiegley429bb272011-04-08 18:41:53 +00006180 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006181 return RHSTy;
6182 }
6183 // And the same for struct objc_selector* / SEL
6184 if (Context.isObjCSelType(LHSTy) &&
John McCall49f4e1c2010-12-10 11:01:00 +00006185 (Context.hasSameType(RHSTy, Context.ObjCSelRedefinitionType))) {
John Wiegley429bb272011-04-08 18:41:53 +00006186 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006187 return LHSTy;
6188 }
6189 if (Context.isObjCSelType(RHSTy) &&
John McCall49f4e1c2010-12-10 11:01:00 +00006190 (Context.hasSameType(LHSTy, Context.ObjCSelRedefinitionType))) {
John Wiegley429bb272011-04-08 18:41:53 +00006191 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006192 return RHSTy;
6193 }
6194 // Check constraints for Objective-C object pointers types.
6195 if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006196
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006197 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
6198 // Two identical object pointer types are always compatible.
6199 return LHSTy;
6200 }
6201 const ObjCObjectPointerType *LHSOPT = LHSTy->getAs<ObjCObjectPointerType>();
6202 const ObjCObjectPointerType *RHSOPT = RHSTy->getAs<ObjCObjectPointerType>();
6203 QualType compositeType = LHSTy;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006204
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006205 // If both operands are interfaces and either operand can be
6206 // assigned to the other, use that type as the composite
6207 // type. This allows
6208 // xxx ? (A*) a : (B*) b
6209 // where B is a subclass of A.
6210 //
6211 // Additionally, as for assignment, if either type is 'id'
6212 // allow silent coercion. Finally, if the types are
6213 // incompatible then make sure to use 'id' as the composite
6214 // type so the result is acceptable for sending messages to.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006215
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006216 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'.
6217 // It could return the composite type.
6218 if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) {
6219 compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy;
6220 } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) {
6221 compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy;
6222 } else if ((LHSTy->isObjCQualifiedIdType() ||
6223 RHSTy->isObjCQualifiedIdType()) &&
6224 Context.ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true)) {
6225 // Need to handle "id<xx>" explicitly.
6226 // GCC allows qualified id and any Objective-C type to devolve to
6227 // id. Currently localizing to here until clear this should be
6228 // part of ObjCQualifiedIdTypesAreCompatible.
6229 compositeType = Context.getObjCIdType();
6230 } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) {
6231 compositeType = Context.getObjCIdType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006232 } else if (!(compositeType =
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006233 Context.areCommonBaseCompatible(LHSOPT, RHSOPT)).isNull())
6234 ;
6235 else {
6236 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands)
6237 << LHSTy << RHSTy
John Wiegley429bb272011-04-08 18:41:53 +00006238 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006239 QualType incompatTy = Context.getObjCIdType();
John Wiegley429bb272011-04-08 18:41:53 +00006240 LHS = ImpCastExprToType(LHS.take(), incompatTy, CK_BitCast);
6241 RHS = ImpCastExprToType(RHS.take(), incompatTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006242 return incompatTy;
6243 }
6244 // The object pointer types are compatible.
John Wiegley429bb272011-04-08 18:41:53 +00006245 LHS = ImpCastExprToType(LHS.take(), compositeType, CK_BitCast);
6246 RHS = ImpCastExprToType(RHS.take(), compositeType, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006247 return compositeType;
6248 }
6249 // Check Objective-C object pointer types and 'void *'
6250 if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) {
6251 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
6252 QualType rhptee = RHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
6253 QualType destPointee
6254 = Context.getQualifiedType(lhptee, rhptee.getQualifiers());
6255 QualType destType = Context.getPointerType(destPointee);
6256 // Add qualifiers if necessary.
John Wiegley429bb272011-04-08 18:41:53 +00006257 LHS = ImpCastExprToType(LHS.take(), destType, CK_NoOp);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006258 // Promote to void*.
John Wiegley429bb272011-04-08 18:41:53 +00006259 RHS = ImpCastExprToType(RHS.take(), destType, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006260 return destType;
6261 }
6262 if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) {
6263 QualType lhptee = LHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
6264 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
6265 QualType destPointee
6266 = Context.getQualifiedType(rhptee, lhptee.getQualifiers());
6267 QualType destType = Context.getPointerType(destPointee);
6268 // Add qualifiers if necessary.
John Wiegley429bb272011-04-08 18:41:53 +00006269 RHS = ImpCastExprToType(RHS.take(), destType, CK_NoOp);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006270 // Promote to void*.
John Wiegley429bb272011-04-08 18:41:53 +00006271 LHS = ImpCastExprToType(LHS.take(), destType, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006272 return destType;
6273 }
6274 return QualType();
6275}
6276
Chandler Carruthf0b60d62011-06-16 01:05:14 +00006277/// SuggestParentheses - Emit a note with a fixit hint that wraps
Hans Wennborg9cfdae32011-06-03 18:00:36 +00006278/// ParenRange in parentheses.
6279static void SuggestParentheses(Sema &Self, SourceLocation Loc,
Chandler Carruthf0b60d62011-06-16 01:05:14 +00006280 const PartialDiagnostic &Note,
6281 SourceRange ParenRange) {
6282 SourceLocation EndLoc = Self.PP.getLocForEndOfToken(ParenRange.getEnd());
6283 if (ParenRange.getBegin().isFileID() && ParenRange.getEnd().isFileID() &&
6284 EndLoc.isValid()) {
6285 Self.Diag(Loc, Note)
6286 << FixItHint::CreateInsertion(ParenRange.getBegin(), "(")
6287 << FixItHint::CreateInsertion(EndLoc, ")");
6288 } else {
6289 // We can't display the parentheses, so just show the bare note.
6290 Self.Diag(Loc, Note) << ParenRange;
Hans Wennborg9cfdae32011-06-03 18:00:36 +00006291 }
Hans Wennborg9cfdae32011-06-03 18:00:36 +00006292}
6293
6294static bool IsArithmeticOp(BinaryOperatorKind Opc) {
6295 return Opc >= BO_Mul && Opc <= BO_Shr;
6296}
6297
Hans Wennborg2f072b42011-06-09 17:06:51 +00006298/// IsArithmeticBinaryExpr - Returns true if E is an arithmetic binary
6299/// expression, either using a built-in or overloaded operator,
6300/// and sets *OpCode to the opcode and *RHS to the right-hand side expression.
6301static bool IsArithmeticBinaryExpr(Expr *E, BinaryOperatorKind *Opcode,
6302 Expr **RHS) {
6303 E = E->IgnoreParenImpCasts();
6304 E = E->IgnoreConversionOperator();
6305 E = E->IgnoreParenImpCasts();
6306
6307 // Built-in binary operator.
6308 if (BinaryOperator *OP = dyn_cast<BinaryOperator>(E)) {
6309 if (IsArithmeticOp(OP->getOpcode())) {
6310 *Opcode = OP->getOpcode();
6311 *RHS = OP->getRHS();
6312 return true;
6313 }
6314 }
6315
6316 // Overloaded operator.
6317 if (CXXOperatorCallExpr *Call = dyn_cast<CXXOperatorCallExpr>(E)) {
6318 if (Call->getNumArgs() != 2)
6319 return false;
6320
6321 // Make sure this is really a binary operator that is safe to pass into
6322 // BinaryOperator::getOverloadedOpcode(), e.g. it's not a subscript op.
6323 OverloadedOperatorKind OO = Call->getOperator();
6324 if (OO < OO_Plus || OO > OO_Arrow)
6325 return false;
6326
6327 BinaryOperatorKind OpKind = BinaryOperator::getOverloadedOpcode(OO);
6328 if (IsArithmeticOp(OpKind)) {
6329 *Opcode = OpKind;
6330 *RHS = Call->getArg(1);
6331 return true;
6332 }
6333 }
6334
6335 return false;
6336}
6337
Hans Wennborg9cfdae32011-06-03 18:00:36 +00006338static bool IsLogicOp(BinaryOperatorKind Opc) {
6339 return (Opc >= BO_LT && Opc <= BO_NE) || (Opc >= BO_LAnd && Opc <= BO_LOr);
6340}
6341
Hans Wennborg2f072b42011-06-09 17:06:51 +00006342/// ExprLooksBoolean - Returns true if E looks boolean, i.e. it has boolean type
6343/// or is a logical expression such as (x==y) which has int type, but is
6344/// commonly interpreted as boolean.
6345static bool ExprLooksBoolean(Expr *E) {
6346 E = E->IgnoreParenImpCasts();
6347
6348 if (E->getType()->isBooleanType())
6349 return true;
6350 if (BinaryOperator *OP = dyn_cast<BinaryOperator>(E))
6351 return IsLogicOp(OP->getOpcode());
6352 if (UnaryOperator *OP = dyn_cast<UnaryOperator>(E))
6353 return OP->getOpcode() == UO_LNot;
6354
6355 return false;
6356}
6357
Hans Wennborg9cfdae32011-06-03 18:00:36 +00006358/// DiagnoseConditionalPrecedence - Emit a warning when a conditional operator
6359/// and binary operator are mixed in a way that suggests the programmer assumed
6360/// the conditional operator has higher precedence, for example:
6361/// "int x = a + someBinaryCondition ? 1 : 2".
6362static void DiagnoseConditionalPrecedence(Sema &Self,
6363 SourceLocation OpLoc,
Chandler Carruth43bc78d2011-06-16 01:05:08 +00006364 Expr *Condition,
6365 Expr *LHS,
6366 Expr *RHS) {
Hans Wennborg2f072b42011-06-09 17:06:51 +00006367 BinaryOperatorKind CondOpcode;
6368 Expr *CondRHS;
Hans Wennborg9cfdae32011-06-03 18:00:36 +00006369
Chandler Carruth43bc78d2011-06-16 01:05:08 +00006370 if (!IsArithmeticBinaryExpr(Condition, &CondOpcode, &CondRHS))
Hans Wennborg2f072b42011-06-09 17:06:51 +00006371 return;
6372 if (!ExprLooksBoolean(CondRHS))
6373 return;
Hans Wennborg9cfdae32011-06-03 18:00:36 +00006374
Hans Wennborg2f072b42011-06-09 17:06:51 +00006375 // The condition is an arithmetic binary expression, with a right-
6376 // hand side that looks boolean, so warn.
Hans Wennborg9cfdae32011-06-03 18:00:36 +00006377
Chandler Carruthf0b60d62011-06-16 01:05:14 +00006378 Self.Diag(OpLoc, diag::warn_precedence_conditional)
Chandler Carruth43bc78d2011-06-16 01:05:08 +00006379 << Condition->getSourceRange()
Hans Wennborg2f072b42011-06-09 17:06:51 +00006380 << BinaryOperator::getOpcodeStr(CondOpcode);
Hans Wennborg9cfdae32011-06-03 18:00:36 +00006381
Chandler Carruthf0b60d62011-06-16 01:05:14 +00006382 SuggestParentheses(Self, OpLoc,
6383 Self.PDiag(diag::note_precedence_conditional_silence)
6384 << BinaryOperator::getOpcodeStr(CondOpcode),
6385 SourceRange(Condition->getLocStart(), Condition->getLocEnd()));
Chandler Carruth9d5353c2011-06-21 23:04:18 +00006386
6387 SuggestParentheses(Self, OpLoc,
6388 Self.PDiag(diag::note_precedence_conditional_first),
6389 SourceRange(CondRHS->getLocStart(), RHS->getLocEnd()));
Hans Wennborg9cfdae32011-06-03 18:00:36 +00006390}
6391
Steve Narofff69936d2007-09-16 03:34:24 +00006392/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null
Reid Spencer5f016e22007-07-11 17:01:13 +00006393/// in the case of a the GNU conditional expr extension.
John McCall60d7b3a2010-08-24 06:29:42 +00006394ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc,
John McCall56ca35d2011-02-17 10:25:35 +00006395 SourceLocation ColonLoc,
6396 Expr *CondExpr, Expr *LHSExpr,
6397 Expr *RHSExpr) {
Chris Lattnera21ddb32007-11-26 01:40:58 +00006398 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS
6399 // was the condition.
John McCall56ca35d2011-02-17 10:25:35 +00006400 OpaqueValueExpr *opaqueValue = 0;
6401 Expr *commonExpr = 0;
6402 if (LHSExpr == 0) {
6403 commonExpr = CondExpr;
6404
6405 // We usually want to apply unary conversions *before* saving, except
6406 // in the special case of a C++ l-value conditional.
6407 if (!(getLangOptions().CPlusPlus
6408 && !commonExpr->isTypeDependent()
6409 && commonExpr->getValueKind() == RHSExpr->getValueKind()
6410 && commonExpr->isGLValue()
6411 && commonExpr->isOrdinaryOrBitFieldObject()
6412 && RHSExpr->isOrdinaryOrBitFieldObject()
6413 && Context.hasSameType(commonExpr->getType(), RHSExpr->getType()))) {
John Wiegley429bb272011-04-08 18:41:53 +00006414 ExprResult commonRes = UsualUnaryConversions(commonExpr);
6415 if (commonRes.isInvalid())
6416 return ExprError();
6417 commonExpr = commonRes.take();
John McCall56ca35d2011-02-17 10:25:35 +00006418 }
6419
6420 opaqueValue = new (Context) OpaqueValueExpr(commonExpr->getExprLoc(),
6421 commonExpr->getType(),
6422 commonExpr->getValueKind(),
6423 commonExpr->getObjectKind());
6424 LHSExpr = CondExpr = opaqueValue;
Fariborz Jahanianf9b949f2010-08-31 18:02:20 +00006425 }
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00006426
John McCallf89e55a2010-11-18 06:31:45 +00006427 ExprValueKind VK = VK_RValue;
John McCall09431682010-11-18 19:01:18 +00006428 ExprObjectKind OK = OK_Ordinary;
John Wiegley429bb272011-04-08 18:41:53 +00006429 ExprResult Cond = Owned(CondExpr), LHS = Owned(LHSExpr), RHS = Owned(RHSExpr);
6430 QualType result = CheckConditionalOperands(Cond, LHS, RHS,
John McCall56ca35d2011-02-17 10:25:35 +00006431 VK, OK, QuestionLoc);
John Wiegley429bb272011-04-08 18:41:53 +00006432 if (result.isNull() || Cond.isInvalid() || LHS.isInvalid() ||
6433 RHS.isInvalid())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00006434 return ExprError();
6435
Hans Wennborg9cfdae32011-06-03 18:00:36 +00006436 DiagnoseConditionalPrecedence(*this, QuestionLoc, Cond.get(), LHS.get(),
6437 RHS.get());
6438
John McCall56ca35d2011-02-17 10:25:35 +00006439 if (!commonExpr)
John Wiegley429bb272011-04-08 18:41:53 +00006440 return Owned(new (Context) ConditionalOperator(Cond.take(), QuestionLoc,
6441 LHS.take(), ColonLoc,
6442 RHS.take(), result, VK, OK));
John McCall56ca35d2011-02-17 10:25:35 +00006443
6444 return Owned(new (Context)
John Wiegley429bb272011-04-08 18:41:53 +00006445 BinaryConditionalOperator(commonExpr, opaqueValue, Cond.take(), LHS.take(),
6446 RHS.take(), QuestionLoc, ColonLoc, result, VK, OK));
Reid Spencer5f016e22007-07-11 17:01:13 +00006447}
6448
John McCalle4be87e2011-01-31 23:13:11 +00006449// checkPointerTypesForAssignment - This is a very tricky routine (despite
Mike Stumpeed9cac2009-02-19 03:04:26 +00006450// being closely modeled after the C99 spec:-). The odd characteristic of this
Reid Spencer5f016e22007-07-11 17:01:13 +00006451// routine is it effectively iqnores the qualifiers on the top level pointee.
6452// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3].
6453// FIXME: add a couple examples in this comment.
John McCalle4be87e2011-01-31 23:13:11 +00006454static Sema::AssignConvertType
6455checkPointerTypesForAssignment(Sema &S, QualType lhsType, QualType rhsType) {
6456 assert(lhsType.isCanonical() && "LHS not canonicalized!");
6457 assert(rhsType.isCanonical() && "RHS not canonicalized!");
Mike Stumpeed9cac2009-02-19 03:04:26 +00006458
Reid Spencer5f016e22007-07-11 17:01:13 +00006459 // get the "pointed to" type (ignoring qualifiers at the top level)
John McCall86c05f32011-02-01 00:10:29 +00006460 const Type *lhptee, *rhptee;
6461 Qualifiers lhq, rhq;
6462 llvm::tie(lhptee, lhq) = cast<PointerType>(lhsType)->getPointeeType().split();
6463 llvm::tie(rhptee, rhq) = cast<PointerType>(rhsType)->getPointeeType().split();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006464
John McCalle4be87e2011-01-31 23:13:11 +00006465 Sema::AssignConvertType ConvTy = Sema::Compatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006466
6467 // C99 6.5.16.1p1: This following citation is common to constraints
6468 // 3 & 4 (below). ...and the type *pointed to* by the left has all the
6469 // qualifiers of the type *pointed to* by the right;
John McCall86c05f32011-02-01 00:10:29 +00006470 Qualifiers lq;
6471
John McCallf85e1932011-06-15 23:02:42 +00006472 // As a special case, 'non-__weak A *' -> 'non-__weak const *' is okay.
6473 if (lhq.getObjCLifetime() != rhq.getObjCLifetime() &&
6474 lhq.compatiblyIncludesObjCLifetime(rhq)) {
6475 // Ignore lifetime for further calculation.
6476 lhq.removeObjCLifetime();
6477 rhq.removeObjCLifetime();
6478 }
6479
John McCall86c05f32011-02-01 00:10:29 +00006480 if (!lhq.compatiblyIncludes(rhq)) {
6481 // Treat address-space mismatches as fatal. TODO: address subspaces
6482 if (lhq.getAddressSpace() != rhq.getAddressSpace())
6483 ConvTy = Sema::IncompatiblePointerDiscardsQualifiers;
6484
John McCallf85e1932011-06-15 23:02:42 +00006485 // It's okay to add or remove GC or lifetime qualifiers when converting to
John McCall22348732011-03-26 02:56:45 +00006486 // and from void*.
John McCallf85e1932011-06-15 23:02:42 +00006487 else if (lhq.withoutObjCGCAttr().withoutObjCGLifetime()
6488 .compatiblyIncludes(
6489 rhq.withoutObjCGCAttr().withoutObjCGLifetime())
John McCall22348732011-03-26 02:56:45 +00006490 && (lhptee->isVoidType() || rhptee->isVoidType()))
6491 ; // keep old
6492
John McCallf85e1932011-06-15 23:02:42 +00006493 // Treat lifetime mismatches as fatal.
6494 else if (lhq.getObjCLifetime() != rhq.getObjCLifetime())
6495 ConvTy = Sema::IncompatiblePointerDiscardsQualifiers;
6496
John McCall86c05f32011-02-01 00:10:29 +00006497 // For GCC compatibility, other qualifier mismatches are treated
6498 // as still compatible in C.
6499 else ConvTy = Sema::CompatiblePointerDiscardsQualifiers;
6500 }
Reid Spencer5f016e22007-07-11 17:01:13 +00006501
Mike Stumpeed9cac2009-02-19 03:04:26 +00006502 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or
6503 // incomplete type and the other is a pointer to a qualified or unqualified
Reid Spencer5f016e22007-07-11 17:01:13 +00006504 // version of void...
Chris Lattnerbfe639e2008-01-03 22:56:36 +00006505 if (lhptee->isVoidType()) {
Chris Lattnerd805bec2008-04-02 06:59:01 +00006506 if (rhptee->isIncompleteOrObjectType())
Chris Lattner5cf216b2008-01-04 18:04:52 +00006507 return ConvTy;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006508
Chris Lattnerbfe639e2008-01-03 22:56:36 +00006509 // As an extension, we allow cast to/from void* to function pointer.
Chris Lattnerd805bec2008-04-02 06:59:01 +00006510 assert(rhptee->isFunctionType());
John McCalle4be87e2011-01-31 23:13:11 +00006511 return Sema::FunctionVoidPointer;
Chris Lattnerbfe639e2008-01-03 22:56:36 +00006512 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006513
Chris Lattnerbfe639e2008-01-03 22:56:36 +00006514 if (rhptee->isVoidType()) {
Chris Lattnerd805bec2008-04-02 06:59:01 +00006515 if (lhptee->isIncompleteOrObjectType())
Chris Lattner5cf216b2008-01-04 18:04:52 +00006516 return ConvTy;
Chris Lattnerbfe639e2008-01-03 22:56:36 +00006517
6518 // As an extension, we allow cast to/from void* to function pointer.
Chris Lattnerd805bec2008-04-02 06:59:01 +00006519 assert(lhptee->isFunctionType());
John McCalle4be87e2011-01-31 23:13:11 +00006520 return Sema::FunctionVoidPointer;
Chris Lattnerbfe639e2008-01-03 22:56:36 +00006521 }
John McCall86c05f32011-02-01 00:10:29 +00006522
Mike Stumpeed9cac2009-02-19 03:04:26 +00006523 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or
Reid Spencer5f016e22007-07-11 17:01:13 +00006524 // unqualified versions of compatible types, ...
John McCall86c05f32011-02-01 00:10:29 +00006525 QualType ltrans = QualType(lhptee, 0), rtrans = QualType(rhptee, 0);
6526 if (!S.Context.typesAreCompatible(ltrans, rtrans)) {
Eli Friedmanf05c05d2009-03-22 23:59:44 +00006527 // Check if the pointee types are compatible ignoring the sign.
6528 // We explicitly check for char so that we catch "char" vs
6529 // "unsigned char" on systems where "char" is unsigned.
Chris Lattner6a2b9262009-10-17 20:33:28 +00006530 if (lhptee->isCharType())
John McCall86c05f32011-02-01 00:10:29 +00006531 ltrans = S.Context.UnsignedCharTy;
Douglas Gregorf6094622010-07-23 15:58:24 +00006532 else if (lhptee->hasSignedIntegerRepresentation())
John McCall86c05f32011-02-01 00:10:29 +00006533 ltrans = S.Context.getCorrespondingUnsignedType(ltrans);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006534
Chris Lattner6a2b9262009-10-17 20:33:28 +00006535 if (rhptee->isCharType())
John McCall86c05f32011-02-01 00:10:29 +00006536 rtrans = S.Context.UnsignedCharTy;
Douglas Gregorf6094622010-07-23 15:58:24 +00006537 else if (rhptee->hasSignedIntegerRepresentation())
John McCall86c05f32011-02-01 00:10:29 +00006538 rtrans = S.Context.getCorrespondingUnsignedType(rtrans);
Chris Lattner6a2b9262009-10-17 20:33:28 +00006539
John McCall86c05f32011-02-01 00:10:29 +00006540 if (ltrans == rtrans) {
Eli Friedmanf05c05d2009-03-22 23:59:44 +00006541 // Types are compatible ignoring the sign. Qualifier incompatibility
6542 // takes priority over sign incompatibility because the sign
6543 // warning can be disabled.
John McCalle4be87e2011-01-31 23:13:11 +00006544 if (ConvTy != Sema::Compatible)
Eli Friedmanf05c05d2009-03-22 23:59:44 +00006545 return ConvTy;
John McCall86c05f32011-02-01 00:10:29 +00006546
John McCalle4be87e2011-01-31 23:13:11 +00006547 return Sema::IncompatiblePointerSign;
Eli Friedmanf05c05d2009-03-22 23:59:44 +00006548 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006549
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00006550 // If we are a multi-level pointer, it's possible that our issue is simply
6551 // one of qualification - e.g. char ** -> const char ** is not allowed. If
6552 // the eventual target type is the same and the pointers have the same
6553 // level of indirection, this must be the issue.
John McCalle4be87e2011-01-31 23:13:11 +00006554 if (isa<PointerType>(lhptee) && isa<PointerType>(rhptee)) {
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00006555 do {
John McCall86c05f32011-02-01 00:10:29 +00006556 lhptee = cast<PointerType>(lhptee)->getPointeeType().getTypePtr();
6557 rhptee = cast<PointerType>(rhptee)->getPointeeType().getTypePtr();
John McCalle4be87e2011-01-31 23:13:11 +00006558 } while (isa<PointerType>(lhptee) && isa<PointerType>(rhptee));
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006559
John McCall86c05f32011-02-01 00:10:29 +00006560 if (lhptee == rhptee)
John McCalle4be87e2011-01-31 23:13:11 +00006561 return Sema::IncompatibleNestedPointerQualifiers;
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00006562 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006563
Eli Friedmanf05c05d2009-03-22 23:59:44 +00006564 // General pointer incompatibility takes priority over qualifiers.
John McCalle4be87e2011-01-31 23:13:11 +00006565 return Sema::IncompatiblePointer;
Eli Friedmanf05c05d2009-03-22 23:59:44 +00006566 }
Chris Lattner5cf216b2008-01-04 18:04:52 +00006567 return ConvTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00006568}
6569
John McCalle4be87e2011-01-31 23:13:11 +00006570/// checkBlockPointerTypesForAssignment - This routine determines whether two
Steve Naroff1c7d0672008-09-04 15:10:53 +00006571/// block pointer types are compatible or whether a block and normal pointer
6572/// are compatible. It is more restrict than comparing two function pointer
6573// types.
John McCalle4be87e2011-01-31 23:13:11 +00006574static Sema::AssignConvertType
6575checkBlockPointerTypesForAssignment(Sema &S, QualType lhsType,
6576 QualType rhsType) {
6577 assert(lhsType.isCanonical() && "LHS not canonicalized!");
6578 assert(rhsType.isCanonical() && "RHS not canonicalized!");
6579
Steve Naroff1c7d0672008-09-04 15:10:53 +00006580 QualType lhptee, rhptee;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006581
Steve Naroff1c7d0672008-09-04 15:10:53 +00006582 // get the "pointed to" type (ignoring qualifiers at the top level)
John McCalle4be87e2011-01-31 23:13:11 +00006583 lhptee = cast<BlockPointerType>(lhsType)->getPointeeType();
6584 rhptee = cast<BlockPointerType>(rhsType)->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006585
John McCalle4be87e2011-01-31 23:13:11 +00006586 // In C++, the types have to match exactly.
6587 if (S.getLangOptions().CPlusPlus)
6588 return Sema::IncompatibleBlockPointer;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006589
John McCalle4be87e2011-01-31 23:13:11 +00006590 Sema::AssignConvertType ConvTy = Sema::Compatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006591
Steve Naroff1c7d0672008-09-04 15:10:53 +00006592 // For blocks we enforce that qualifiers are identical.
John McCalle4be87e2011-01-31 23:13:11 +00006593 if (lhptee.getLocalQualifiers() != rhptee.getLocalQualifiers())
6594 ConvTy = Sema::CompatiblePointerDiscardsQualifiers;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006595
John McCalle4be87e2011-01-31 23:13:11 +00006596 if (!S.Context.typesAreBlockPointerCompatible(lhsType, rhsType))
6597 return Sema::IncompatibleBlockPointer;
6598
Steve Naroff1c7d0672008-09-04 15:10:53 +00006599 return ConvTy;
6600}
6601
John McCalle4be87e2011-01-31 23:13:11 +00006602/// checkObjCPointerTypesForAssignment - Compares two objective-c pointer types
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00006603/// for assignment compatibility.
John McCalle4be87e2011-01-31 23:13:11 +00006604static Sema::AssignConvertType
6605checkObjCPointerTypesForAssignment(Sema &S, QualType lhsType, QualType rhsType) {
6606 assert(lhsType.isCanonical() && "LHS was not canonicalized!");
6607 assert(rhsType.isCanonical() && "RHS was not canonicalized!");
6608
Fariborz Jahaniand4c60902010-03-19 18:06:10 +00006609 if (lhsType->isObjCBuiltinType()) {
6610 // Class is not compatible with ObjC object pointers.
Fariborz Jahanian528adb12010-03-24 21:00:27 +00006611 if (lhsType->isObjCClassType() && !rhsType->isObjCBuiltinType() &&
6612 !rhsType->isObjCQualifiedClassType())
John McCalle4be87e2011-01-31 23:13:11 +00006613 return Sema::IncompatiblePointer;
6614 return Sema::Compatible;
Fariborz Jahaniand4c60902010-03-19 18:06:10 +00006615 }
6616 if (rhsType->isObjCBuiltinType()) {
6617 // Class is not compatible with ObjC object pointers.
Fariborz Jahanian528adb12010-03-24 21:00:27 +00006618 if (rhsType->isObjCClassType() && !lhsType->isObjCBuiltinType() &&
6619 !lhsType->isObjCQualifiedClassType())
John McCalle4be87e2011-01-31 23:13:11 +00006620 return Sema::IncompatiblePointer;
6621 return Sema::Compatible;
Fariborz Jahaniand4c60902010-03-19 18:06:10 +00006622 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006623 QualType lhptee =
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00006624 lhsType->getAs<ObjCObjectPointerType>()->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006625 QualType rhptee =
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00006626 rhsType->getAs<ObjCObjectPointerType>()->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006627
John McCalle4be87e2011-01-31 23:13:11 +00006628 if (!lhptee.isAtLeastAsQualifiedAs(rhptee))
6629 return Sema::CompatiblePointerDiscardsQualifiers;
6630
6631 if (S.Context.typesAreCompatible(lhsType, rhsType))
6632 return Sema::Compatible;
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00006633 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType())
John McCalle4be87e2011-01-31 23:13:11 +00006634 return Sema::IncompatibleObjCQualifiedId;
6635 return Sema::IncompatiblePointer;
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00006636}
6637
John McCall1c23e912010-11-16 02:32:08 +00006638Sema::AssignConvertType
Douglas Gregorb608b982011-01-28 02:26:04 +00006639Sema::CheckAssignmentConstraints(SourceLocation Loc,
6640 QualType lhsType, QualType rhsType) {
John McCall1c23e912010-11-16 02:32:08 +00006641 // Fake up an opaque expression. We don't actually care about what
6642 // cast operations are required, so if CheckAssignmentConstraints
6643 // adds casts to this they'll be wasted, but fortunately that doesn't
6644 // usually happen on valid code.
Douglas Gregorb608b982011-01-28 02:26:04 +00006645 OpaqueValueExpr rhs(Loc, rhsType, VK_RValue);
John Wiegley429bb272011-04-08 18:41:53 +00006646 ExprResult rhsPtr = &rhs;
John McCall1c23e912010-11-16 02:32:08 +00006647 CastKind K = CK_Invalid;
6648
6649 return CheckAssignmentConstraints(lhsType, rhsPtr, K);
6650}
6651
Mike Stumpeed9cac2009-02-19 03:04:26 +00006652/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently
6653/// has code to accommodate several GCC extensions when type checking
Reid Spencer5f016e22007-07-11 17:01:13 +00006654/// pointers. Here are some objectionable examples that GCC considers warnings:
6655///
6656/// int a, *pint;
6657/// short *pshort;
6658/// struct foo *pfoo;
6659///
6660/// pint = pshort; // warning: assignment from incompatible pointer type
6661/// a = pint; // warning: assignment makes integer from pointer without a cast
6662/// pint = a; // warning: assignment makes pointer from integer without a cast
6663/// pint = pfoo; // warning: assignment from incompatible pointer type
6664///
6665/// As a result, the code for dealing with pointers is more complex than the
Mike Stumpeed9cac2009-02-19 03:04:26 +00006666/// C99 spec dictates.
Reid Spencer5f016e22007-07-11 17:01:13 +00006667///
John McCalldaa8e4e2010-11-15 09:13:47 +00006668/// Sets 'Kind' for any result kind except Incompatible.
Chris Lattner5cf216b2008-01-04 18:04:52 +00006669Sema::AssignConvertType
John Wiegley429bb272011-04-08 18:41:53 +00006670Sema::CheckAssignmentConstraints(QualType lhsType, ExprResult &rhs,
John McCalldaa8e4e2010-11-15 09:13:47 +00006671 CastKind &Kind) {
John Wiegley429bb272011-04-08 18:41:53 +00006672 QualType rhsType = rhs.get()->getType();
John McCall1c23e912010-11-16 02:32:08 +00006673
Chris Lattnerfc144e22008-01-04 23:18:45 +00006674 // Get canonical types. We're not formatting these types, just comparing
6675 // them.
Chris Lattnerb77792e2008-07-26 22:17:49 +00006676 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType();
6677 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType();
Eli Friedmanf8f873d2008-05-30 18:07:22 +00006678
John McCallb6cfa242011-01-31 22:28:28 +00006679 // Common case: no conversion required.
John McCalldaa8e4e2010-11-15 09:13:47 +00006680 if (lhsType == rhsType) {
6681 Kind = CK_NoOp;
John McCalldaa8e4e2010-11-15 09:13:47 +00006682 return Compatible;
David Chisnall0f436562009-08-17 16:35:33 +00006683 }
6684
Douglas Gregor9d293df2008-10-28 00:22:11 +00006685 // If the left-hand side is a reference type, then we are in a
6686 // (rare!) case where we've allowed the use of references in C,
6687 // e.g., as a parameter type in a built-in function. In this case,
6688 // just make sure that the type referenced is compatible with the
6689 // right-hand side type. The caller is responsible for adjusting
6690 // lhsType so that the resulting expression does not have reference
6691 // type.
Ted Kremenek6217b802009-07-29 21:53:49 +00006692 if (const ReferenceType *lhsTypeRef = lhsType->getAs<ReferenceType>()) {
John McCalldaa8e4e2010-11-15 09:13:47 +00006693 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) {
6694 Kind = CK_LValueBitCast;
Anders Carlsson793680e2007-10-12 23:56:29 +00006695 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00006696 }
Chris Lattnerfc144e22008-01-04 23:18:45 +00006697 return Incompatible;
Fariborz Jahanian411f3732007-12-19 17:45:58 +00006698 }
John McCallb6cfa242011-01-31 22:28:28 +00006699
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00006700 // Allow scalar to ExtVector assignments, and assignments of an ExtVector type
6701 // to the same ExtVector type.
6702 if (lhsType->isExtVectorType()) {
6703 if (rhsType->isExtVectorType())
John McCalldaa8e4e2010-11-15 09:13:47 +00006704 return Incompatible;
6705 if (rhsType->isArithmeticType()) {
John McCall1c23e912010-11-16 02:32:08 +00006706 // CK_VectorSplat does T -> vector T, so first cast to the
6707 // element type.
6708 QualType elType = cast<ExtVectorType>(lhsType)->getElementType();
6709 if (elType != rhsType) {
6710 Kind = PrepareScalarCast(*this, rhs, elType);
John Wiegley429bb272011-04-08 18:41:53 +00006711 rhs = ImpCastExprToType(rhs.take(), elType, Kind);
John McCall1c23e912010-11-16 02:32:08 +00006712 }
6713 Kind = CK_VectorSplat;
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00006714 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00006715 }
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00006716 }
Mike Stump1eb44332009-09-09 15:08:12 +00006717
John McCallb6cfa242011-01-31 22:28:28 +00006718 // Conversions to or from vector type.
Nate Begemanbe2341d2008-07-14 18:02:46 +00006719 if (lhsType->isVectorType() || rhsType->isVectorType()) {
Douglas Gregor255210e2010-08-06 10:14:59 +00006720 if (lhsType->isVectorType() && rhsType->isVectorType()) {
Bob Wilsonde3deea2010-12-02 00:25:15 +00006721 // Allow assignments of an AltiVec vector type to an equivalent GCC
6722 // vector type and vice versa
6723 if (Context.areCompatibleVectorTypes(lhsType, rhsType)) {
6724 Kind = CK_BitCast;
6725 return Compatible;
6726 }
6727
Douglas Gregor255210e2010-08-06 10:14:59 +00006728 // If we are allowing lax vector conversions, and LHS and RHS are both
6729 // vectors, the total size only needs to be the same. This is a bitcast;
6730 // no bits are changed but the result type is different.
6731 if (getLangOptions().LaxVectorConversions &&
John McCalldaa8e4e2010-11-15 09:13:47 +00006732 (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType))) {
John McCall0c6d28d2010-11-15 10:08:00 +00006733 Kind = CK_BitCast;
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00006734 return IncompatibleVectors;
John McCalldaa8e4e2010-11-15 09:13:47 +00006735 }
Chris Lattnere8b3e962008-01-04 23:32:24 +00006736 }
6737 return Incompatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006738 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00006739
John McCallb6cfa242011-01-31 22:28:28 +00006740 // Arithmetic conversions.
Douglas Gregor88623ad2010-05-23 21:53:47 +00006741 if (lhsType->isArithmeticType() && rhsType->isArithmeticType() &&
John McCalldaa8e4e2010-11-15 09:13:47 +00006742 !(getLangOptions().CPlusPlus && lhsType->isEnumeralType())) {
John McCall1c23e912010-11-16 02:32:08 +00006743 Kind = PrepareScalarCast(*this, rhs, lhsType);
Reid Spencer5f016e22007-07-11 17:01:13 +00006744 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00006745 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00006746
John McCallb6cfa242011-01-31 22:28:28 +00006747 // Conversions to normal pointers.
6748 if (const PointerType *lhsPointer = dyn_cast<PointerType>(lhsType)) {
6749 // U* -> T*
John McCalldaa8e4e2010-11-15 09:13:47 +00006750 if (isa<PointerType>(rhsType)) {
6751 Kind = CK_BitCast;
John McCalle4be87e2011-01-31 23:13:11 +00006752 return checkPointerTypesForAssignment(*this, lhsType, rhsType);
John McCalldaa8e4e2010-11-15 09:13:47 +00006753 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006754
John McCallb6cfa242011-01-31 22:28:28 +00006755 // int -> T*
6756 if (rhsType->isIntegerType()) {
6757 Kind = CK_IntegralToPointer; // FIXME: null?
6758 return IntToPointer;
Steve Naroff14108da2009-07-10 23:34:53 +00006759 }
John McCallb6cfa242011-01-31 22:28:28 +00006760
6761 // C pointers are not compatible with ObjC object pointers,
6762 // with two exceptions:
6763 if (isa<ObjCObjectPointerType>(rhsType)) {
6764 // - conversions to void*
6765 if (lhsPointer->getPointeeType()->isVoidType()) {
6766 Kind = CK_AnyPointerToObjCPointerCast;
6767 return Compatible;
6768 }
6769
6770 // - conversions from 'Class' to the redefinition type
6771 if (rhsType->isObjCClassType() &&
6772 Context.hasSameType(lhsType, Context.ObjCClassRedefinitionType)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00006773 Kind = CK_BitCast;
Douglas Gregor63a94902008-11-27 00:44:28 +00006774 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00006775 }
Steve Naroffb4406862008-09-29 18:10:17 +00006776
John McCallb6cfa242011-01-31 22:28:28 +00006777 Kind = CK_BitCast;
6778 return IncompatiblePointer;
6779 }
6780
6781 // U^ -> void*
6782 if (rhsType->getAs<BlockPointerType>()) {
6783 if (lhsPointer->getPointeeType()->isVoidType()) {
6784 Kind = CK_BitCast;
Steve Naroffb4406862008-09-29 18:10:17 +00006785 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00006786 }
Steve Naroffb4406862008-09-29 18:10:17 +00006787 }
John McCallb6cfa242011-01-31 22:28:28 +00006788
Steve Naroff1c7d0672008-09-04 15:10:53 +00006789 return Incompatible;
6790 }
6791
John McCallb6cfa242011-01-31 22:28:28 +00006792 // Conversions to block pointers.
Steve Naroff1c7d0672008-09-04 15:10:53 +00006793 if (isa<BlockPointerType>(lhsType)) {
John McCallb6cfa242011-01-31 22:28:28 +00006794 // U^ -> T^
6795 if (rhsType->isBlockPointerType()) {
6796 Kind = CK_AnyPointerToBlockPointerCast;
John McCalle4be87e2011-01-31 23:13:11 +00006797 return checkBlockPointerTypesForAssignment(*this, lhsType, rhsType);
John McCallb6cfa242011-01-31 22:28:28 +00006798 }
6799
6800 // int or null -> T^
John McCalldaa8e4e2010-11-15 09:13:47 +00006801 if (rhsType->isIntegerType()) {
6802 Kind = CK_IntegralToPointer; // FIXME: null
Eli Friedmand8f4f432009-02-25 04:20:42 +00006803 return IntToBlockPointer;
John McCalldaa8e4e2010-11-15 09:13:47 +00006804 }
6805
John McCallb6cfa242011-01-31 22:28:28 +00006806 // id -> T^
6807 if (getLangOptions().ObjC1 && rhsType->isObjCIdType()) {
6808 Kind = CK_AnyPointerToBlockPointerCast;
Steve Naroffb4406862008-09-29 18:10:17 +00006809 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00006810 }
Steve Naroffb4406862008-09-29 18:10:17 +00006811
John McCallb6cfa242011-01-31 22:28:28 +00006812 // void* -> T^
John McCalldaa8e4e2010-11-15 09:13:47 +00006813 if (const PointerType *RHSPT = rhsType->getAs<PointerType>())
John McCallb6cfa242011-01-31 22:28:28 +00006814 if (RHSPT->getPointeeType()->isVoidType()) {
6815 Kind = CK_AnyPointerToBlockPointerCast;
Douglas Gregor63a94902008-11-27 00:44:28 +00006816 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00006817 }
John McCalldaa8e4e2010-11-15 09:13:47 +00006818
Chris Lattnerfc144e22008-01-04 23:18:45 +00006819 return Incompatible;
6820 }
6821
John McCallb6cfa242011-01-31 22:28:28 +00006822 // Conversions to Objective-C pointers.
Steve Naroff14108da2009-07-10 23:34:53 +00006823 if (isa<ObjCObjectPointerType>(lhsType)) {
John McCallb6cfa242011-01-31 22:28:28 +00006824 // A* -> B*
6825 if (rhsType->isObjCObjectPointerType()) {
6826 Kind = CK_BitCast;
John McCalle4be87e2011-01-31 23:13:11 +00006827 return checkObjCPointerTypesForAssignment(*this, lhsType, rhsType);
John McCallb6cfa242011-01-31 22:28:28 +00006828 }
6829
6830 // int or null -> A*
John McCalldaa8e4e2010-11-15 09:13:47 +00006831 if (rhsType->isIntegerType()) {
6832 Kind = CK_IntegralToPointer; // FIXME: null
Steve Naroff14108da2009-07-10 23:34:53 +00006833 return IntToPointer;
John McCalldaa8e4e2010-11-15 09:13:47 +00006834 }
6835
John McCallb6cfa242011-01-31 22:28:28 +00006836 // In general, C pointers are not compatible with ObjC object pointers,
6837 // with two exceptions:
Steve Naroff14108da2009-07-10 23:34:53 +00006838 if (isa<PointerType>(rhsType)) {
John McCallb6cfa242011-01-31 22:28:28 +00006839 // - conversions from 'void*'
6840 if (rhsType->isVoidPointerType()) {
6841 Kind = CK_AnyPointerToObjCPointerCast;
Steve Naroff67ef8ea2009-07-20 17:56:53 +00006842 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00006843 }
6844
6845 // - conversions to 'Class' from its redefinition type
6846 if (lhsType->isObjCClassType() &&
6847 Context.hasSameType(rhsType, Context.ObjCClassRedefinitionType)) {
6848 Kind = CK_BitCast;
6849 return Compatible;
6850 }
6851
6852 Kind = CK_AnyPointerToObjCPointerCast;
Steve Naroff67ef8ea2009-07-20 17:56:53 +00006853 return IncompatiblePointer;
Steve Naroff14108da2009-07-10 23:34:53 +00006854 }
John McCallb6cfa242011-01-31 22:28:28 +00006855
6856 // T^ -> A*
6857 if (rhsType->isBlockPointerType()) {
6858 Kind = CK_AnyPointerToObjCPointerCast;
Steve Naroff14108da2009-07-10 23:34:53 +00006859 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00006860 }
6861
Steve Naroff14108da2009-07-10 23:34:53 +00006862 return Incompatible;
6863 }
John McCallb6cfa242011-01-31 22:28:28 +00006864
6865 // Conversions from pointers that are not covered by the above.
Chris Lattner78eca282008-04-07 06:49:41 +00006866 if (isa<PointerType>(rhsType)) {
John McCallb6cfa242011-01-31 22:28:28 +00006867 // T* -> _Bool
John McCalldaa8e4e2010-11-15 09:13:47 +00006868 if (lhsType == Context.BoolTy) {
6869 Kind = CK_PointerToBoolean;
Eli Friedmanf8f873d2008-05-30 18:07:22 +00006870 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00006871 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00006872
John McCallb6cfa242011-01-31 22:28:28 +00006873 // T* -> int
John McCalldaa8e4e2010-11-15 09:13:47 +00006874 if (lhsType->isIntegerType()) {
6875 Kind = CK_PointerToIntegral;
Chris Lattnerb7b61152008-01-04 18:22:42 +00006876 return PointerToInt;
John McCalldaa8e4e2010-11-15 09:13:47 +00006877 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006878
Chris Lattnerfc144e22008-01-04 23:18:45 +00006879 return Incompatible;
Chris Lattnerfc144e22008-01-04 23:18:45 +00006880 }
John McCallb6cfa242011-01-31 22:28:28 +00006881
6882 // Conversions from Objective-C pointers that are not covered by the above.
Steve Naroff14108da2009-07-10 23:34:53 +00006883 if (isa<ObjCObjectPointerType>(rhsType)) {
John McCallb6cfa242011-01-31 22:28:28 +00006884 // T* -> _Bool
John McCalldaa8e4e2010-11-15 09:13:47 +00006885 if (lhsType == Context.BoolTy) {
6886 Kind = CK_PointerToBoolean;
Steve Naroff14108da2009-07-10 23:34:53 +00006887 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00006888 }
Steve Naroff14108da2009-07-10 23:34:53 +00006889
John McCallb6cfa242011-01-31 22:28:28 +00006890 // T* -> int
John McCalldaa8e4e2010-11-15 09:13:47 +00006891 if (lhsType->isIntegerType()) {
6892 Kind = CK_PointerToIntegral;
Steve Naroff14108da2009-07-10 23:34:53 +00006893 return PointerToInt;
John McCalldaa8e4e2010-11-15 09:13:47 +00006894 }
6895
Steve Naroff14108da2009-07-10 23:34:53 +00006896 return Incompatible;
6897 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00006898
John McCallb6cfa242011-01-31 22:28:28 +00006899 // struct A -> struct B
Chris Lattnerfc144e22008-01-04 23:18:45 +00006900 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00006901 if (Context.typesAreCompatible(lhsType, rhsType)) {
6902 Kind = CK_NoOp;
Reid Spencer5f016e22007-07-11 17:01:13 +00006903 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00006904 }
Reid Spencer5f016e22007-07-11 17:01:13 +00006905 }
John McCallb6cfa242011-01-31 22:28:28 +00006906
Reid Spencer5f016e22007-07-11 17:01:13 +00006907 return Incompatible;
6908}
6909
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006910/// \brief Constructs a transparent union from an expression that is
6911/// used to initialize the transparent union.
John Wiegley429bb272011-04-08 18:41:53 +00006912static void ConstructTransparentUnion(Sema &S, ASTContext &C, ExprResult &EResult,
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006913 QualType UnionType, FieldDecl *Field) {
6914 // Build an initializer list that designates the appropriate member
6915 // of the transparent union.
John Wiegley429bb272011-04-08 18:41:53 +00006916 Expr *E = EResult.take();
Ted Kremenek709210f2010-04-13 23:39:13 +00006917 InitListExpr *Initializer = new (C) InitListExpr(C, SourceLocation(),
Ted Kremenekba7bc552010-02-19 01:50:18 +00006918 &E, 1,
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006919 SourceLocation());
6920 Initializer->setType(UnionType);
6921 Initializer->setInitializedFieldInUnion(Field);
6922
6923 // Build a compound literal constructing a value of the transparent
6924 // union type from this initializer list.
John McCall42f56b52010-01-18 19:35:47 +00006925 TypeSourceInfo *unionTInfo = C.getTrivialTypeSourceInfo(UnionType);
John Wiegley429bb272011-04-08 18:41:53 +00006926 EResult = S.Owned(
6927 new (C) CompoundLiteralExpr(SourceLocation(), unionTInfo, UnionType,
6928 VK_RValue, Initializer, false));
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006929}
6930
6931Sema::AssignConvertType
John Wiegley429bb272011-04-08 18:41:53 +00006932Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, ExprResult &rExpr) {
6933 QualType FromType = rExpr.get()->getType();
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006934
Mike Stump1eb44332009-09-09 15:08:12 +00006935 // If the ArgType is a Union type, we want to handle a potential
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006936 // transparent_union GCC extension.
6937 const RecordType *UT = ArgType->getAsUnionType();
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00006938 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>())
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006939 return Incompatible;
6940
6941 // The field to initialize within the transparent union.
6942 RecordDecl *UD = UT->getDecl();
6943 FieldDecl *InitField = 0;
6944 // It's compatible if the expression matches any of the fields.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00006945 for (RecordDecl::field_iterator it = UD->field_begin(),
6946 itend = UD->field_end();
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006947 it != itend; ++it) {
6948 if (it->getType()->isPointerType()) {
6949 // If the transparent union contains a pointer type, we allow:
6950 // 1) void pointer
6951 // 2) null pointer constant
6952 if (FromType->isPointerType())
Ted Kremenek6217b802009-07-29 21:53:49 +00006953 if (FromType->getAs<PointerType>()->getPointeeType()->isVoidType()) {
John Wiegley429bb272011-04-08 18:41:53 +00006954 rExpr = ImpCastExprToType(rExpr.take(), it->getType(), CK_BitCast);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006955 InitField = *it;
6956 break;
6957 }
Mike Stump1eb44332009-09-09 15:08:12 +00006958
John Wiegley429bb272011-04-08 18:41:53 +00006959 if (rExpr.get()->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00006960 Expr::NPC_ValueDependentIsNull)) {
John Wiegley429bb272011-04-08 18:41:53 +00006961 rExpr = ImpCastExprToType(rExpr.take(), it->getType(), CK_NullToPointer);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006962 InitField = *it;
6963 break;
6964 }
6965 }
6966
John McCalldaa8e4e2010-11-15 09:13:47 +00006967 CastKind Kind = CK_Invalid;
John Wiegley429bb272011-04-08 18:41:53 +00006968 if (CheckAssignmentConstraints(it->getType(), rExpr, Kind)
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006969 == Compatible) {
John Wiegley429bb272011-04-08 18:41:53 +00006970 rExpr = ImpCastExprToType(rExpr.take(), it->getType(), Kind);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006971 InitField = *it;
6972 break;
6973 }
6974 }
6975
6976 if (!InitField)
6977 return Incompatible;
6978
John Wiegley429bb272011-04-08 18:41:53 +00006979 ConstructTransparentUnion(*this, Context, rExpr, ArgType, InitField);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006980 return Compatible;
6981}
6982
Chris Lattner5cf216b2008-01-04 18:04:52 +00006983Sema::AssignConvertType
John Wiegley429bb272011-04-08 18:41:53 +00006984Sema::CheckSingleAssignmentConstraints(QualType lhsType, ExprResult &rExpr) {
Douglas Gregor98cd5992008-10-21 23:43:52 +00006985 if (getLangOptions().CPlusPlus) {
6986 if (!lhsType->isRecordType()) {
6987 // C++ 5.17p3: If the left operand is not of class type, the
6988 // expression is implicitly converted (C++ 4) to the
6989 // cv-unqualified type of the left operand.
John Wiegley429bb272011-04-08 18:41:53 +00006990 ExprResult Res = PerformImplicitConversion(rExpr.get(),
6991 lhsType.getUnqualifiedType(),
6992 AA_Assigning);
6993 if (Res.isInvalid())
Douglas Gregor98cd5992008-10-21 23:43:52 +00006994 return Incompatible;
John Wiegley429bb272011-04-08 18:41:53 +00006995 rExpr = move(Res);
Chris Lattner2c4463f2009-04-12 09:02:39 +00006996 return Compatible;
Douglas Gregor98cd5992008-10-21 23:43:52 +00006997 }
6998
6999 // FIXME: Currently, we fall through and treat C++ classes like C
7000 // structures.
John McCallf6a16482010-12-04 03:47:34 +00007001 }
Douglas Gregor98cd5992008-10-21 23:43:52 +00007002
Steve Naroff529a4ad2007-11-27 17:58:44 +00007003 // C99 6.5.16.1p1: the left operand is a pointer and the right is
7004 // a null pointer constant.
Mike Stump1eb44332009-09-09 15:08:12 +00007005 if ((lhsType->isPointerType() ||
7006 lhsType->isObjCObjectPointerType() ||
Mike Stumpeed9cac2009-02-19 03:04:26 +00007007 lhsType->isBlockPointerType())
John Wiegley429bb272011-04-08 18:41:53 +00007008 && rExpr.get()->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00007009 Expr::NPC_ValueDependentIsNull)) {
John Wiegley429bb272011-04-08 18:41:53 +00007010 rExpr = ImpCastExprToType(rExpr.take(), lhsType, CK_NullToPointer);
Steve Naroff529a4ad2007-11-27 17:58:44 +00007011 return Compatible;
7012 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007013
Chris Lattner943140e2007-10-16 02:55:40 +00007014 // This check seems unnatural, however it is necessary to ensure the proper
Steve Naroff90045e82007-07-13 23:32:42 +00007015 // conversion of functions/arrays. If the conversion were done for all
Douglas Gregor02a24ee2009-11-03 16:56:39 +00007016 // DeclExpr's (created by ActOnIdExpression), it would mess up the unary
Nick Lewyckyc133e9e2010-08-05 06:27:49 +00007017 // expressions that suppress this implicit conversion (&, sizeof).
Chris Lattner943140e2007-10-16 02:55:40 +00007018 //
Mike Stumpeed9cac2009-02-19 03:04:26 +00007019 // Suppress this for references: C++ 8.5.3p5.
John Wiegley429bb272011-04-08 18:41:53 +00007020 if (!lhsType->isReferenceType()) {
7021 rExpr = DefaultFunctionArrayLvalueConversion(rExpr.take());
7022 if (rExpr.isInvalid())
7023 return Incompatible;
7024 }
Steve Narofff1120de2007-08-24 22:33:52 +00007025
John McCalldaa8e4e2010-11-15 09:13:47 +00007026 CastKind Kind = CK_Invalid;
Chris Lattner5cf216b2008-01-04 18:04:52 +00007027 Sema::AssignConvertType result =
John McCall1c23e912010-11-16 02:32:08 +00007028 CheckAssignmentConstraints(lhsType, rExpr, Kind);
Mike Stumpeed9cac2009-02-19 03:04:26 +00007029
Steve Narofff1120de2007-08-24 22:33:52 +00007030 // C99 6.5.16.1p2: The value of the right operand is converted to the
7031 // type of the assignment expression.
Douglas Gregor9d293df2008-10-28 00:22:11 +00007032 // CheckAssignmentConstraints allows the left-hand side to be a reference,
7033 // so that we can use references in built-in functions even in C.
7034 // The getNonReferenceType() call makes sure that the resulting expression
7035 // does not have reference type.
John Wiegley429bb272011-04-08 18:41:53 +00007036 if (result != Incompatible && rExpr.get()->getType() != lhsType)
7037 rExpr = ImpCastExprToType(rExpr.take(), lhsType.getNonLValueExprType(Context), Kind);
Steve Narofff1120de2007-08-24 22:33:52 +00007038 return result;
Steve Naroff90045e82007-07-13 23:32:42 +00007039}
7040
John Wiegley429bb272011-04-08 18:41:53 +00007041QualType Sema::InvalidOperands(SourceLocation Loc, ExprResult &lex, ExprResult &rex) {
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00007042 Diag(Loc, diag::err_typecheck_invalid_operands)
John Wiegley429bb272011-04-08 18:41:53 +00007043 << lex.get()->getType() << rex.get()->getType()
7044 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Chris Lattnerca5eede2007-12-12 05:47:28 +00007045 return QualType();
Reid Spencer5f016e22007-07-11 17:01:13 +00007046}
7047
John Wiegley429bb272011-04-08 18:41:53 +00007048QualType Sema::CheckVectorOperands(SourceLocation Loc, ExprResult &lex, ExprResult &rex) {
Mike Stumpeed9cac2009-02-19 03:04:26 +00007049 // For conversion purposes, we ignore any qualifiers.
Nate Begeman1330b0e2008-04-04 01:30:25 +00007050 // For example, "const float" and "float" are equivalent.
Chris Lattnerb77792e2008-07-26 22:17:49 +00007051 QualType lhsType =
John Wiegley429bb272011-04-08 18:41:53 +00007052 Context.getCanonicalType(lex.get()->getType()).getUnqualifiedType();
Chris Lattnerb77792e2008-07-26 22:17:49 +00007053 QualType rhsType =
John Wiegley429bb272011-04-08 18:41:53 +00007054 Context.getCanonicalType(rex.get()->getType()).getUnqualifiedType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007055
Nate Begemanbe2341d2008-07-14 18:02:46 +00007056 // If the vector types are identical, return.
Nate Begeman1330b0e2008-04-04 01:30:25 +00007057 if (lhsType == rhsType)
Reid Spencer5f016e22007-07-11 17:01:13 +00007058 return lhsType;
Nate Begeman4119d1a2007-12-30 02:59:45 +00007059
Nate Begemanbe2341d2008-07-14 18:02:46 +00007060 // Handle the case of a vector & extvector type of the same size and element
7061 // type. It would be nice if we only had one vector type someday.
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00007062 if (getLangOptions().LaxVectorConversions) {
John McCall183700f2009-09-21 23:43:11 +00007063 if (const VectorType *LV = lhsType->getAs<VectorType>()) {
Chandler Carruth629f9e42010-08-30 07:36:24 +00007064 if (const VectorType *RV = rhsType->getAs<VectorType>()) {
Nate Begemanbe2341d2008-07-14 18:02:46 +00007065 if (LV->getElementType() == RV->getElementType() &&
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00007066 LV->getNumElements() == RV->getNumElements()) {
Douglas Gregor26bcf672010-05-19 03:21:00 +00007067 if (lhsType->isExtVectorType()) {
John Wiegley429bb272011-04-08 18:41:53 +00007068 rex = ImpCastExprToType(rex.take(), lhsType, CK_BitCast);
Douglas Gregor26bcf672010-05-19 03:21:00 +00007069 return lhsType;
7070 }
7071
John Wiegley429bb272011-04-08 18:41:53 +00007072 lex = ImpCastExprToType(lex.take(), rhsType, CK_BitCast);
Douglas Gregor26bcf672010-05-19 03:21:00 +00007073 return rhsType;
Eric Christophere84f9eb2010-08-26 00:42:16 +00007074 } else if (Context.getTypeSize(lhsType) ==Context.getTypeSize(rhsType)){
7075 // If we are allowing lax vector conversions, and LHS and RHS are both
7076 // vectors, the total size only needs to be the same. This is a
7077 // bitcast; no bits are changed but the result type is different.
John Wiegley429bb272011-04-08 18:41:53 +00007078 rex = ImpCastExprToType(rex.take(), lhsType, CK_BitCast);
Eric Christophere84f9eb2010-08-26 00:42:16 +00007079 return lhsType;
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00007080 }
Eric Christophere84f9eb2010-08-26 00:42:16 +00007081 }
Chandler Carruth629f9e42010-08-30 07:36:24 +00007082 }
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00007083 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007084
Douglas Gregor255210e2010-08-06 10:14:59 +00007085 // Handle the case of equivalent AltiVec and GCC vector types
7086 if (lhsType->isVectorType() && rhsType->isVectorType() &&
7087 Context.areCompatibleVectorTypes(lhsType, rhsType)) {
John Wiegley429bb272011-04-08 18:41:53 +00007088 lex = ImpCastExprToType(lex.take(), rhsType, CK_BitCast);
Douglas Gregor255210e2010-08-06 10:14:59 +00007089 return rhsType;
7090 }
7091
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00007092 // Canonicalize the ExtVector to the LHS, remember if we swapped so we can
7093 // swap back (so that we don't reverse the inputs to a subtract, for instance.
7094 bool swapped = false;
7095 if (rhsType->isExtVectorType()) {
7096 swapped = true;
7097 std::swap(rex, lex);
7098 std::swap(rhsType, lhsType);
7099 }
Mike Stump1eb44332009-09-09 15:08:12 +00007100
Nate Begemandde25982009-06-28 19:12:57 +00007101 // Handle the case of an ext vector and scalar.
John McCall183700f2009-09-21 23:43:11 +00007102 if (const ExtVectorType *LV = lhsType->getAs<ExtVectorType>()) {
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00007103 QualType EltTy = LV->getElementType();
Douglas Gregor9d3347a2010-06-16 00:35:25 +00007104 if (EltTy->isIntegralType(Context) && rhsType->isIntegralType(Context)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00007105 int order = Context.getIntegerTypeOrder(EltTy, rhsType);
7106 if (order > 0)
John Wiegley429bb272011-04-08 18:41:53 +00007107 rex = ImpCastExprToType(rex.take(), EltTy, CK_IntegralCast);
John McCalldaa8e4e2010-11-15 09:13:47 +00007108 if (order >= 0) {
John Wiegley429bb272011-04-08 18:41:53 +00007109 rex = ImpCastExprToType(rex.take(), lhsType, CK_VectorSplat);
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00007110 if (swapped) std::swap(rex, lex);
7111 return lhsType;
7112 }
7113 }
7114 if (EltTy->isRealFloatingType() && rhsType->isScalarType() &&
7115 rhsType->isRealFloatingType()) {
John McCalldaa8e4e2010-11-15 09:13:47 +00007116 int order = Context.getFloatingTypeOrder(EltTy, rhsType);
7117 if (order > 0)
John Wiegley429bb272011-04-08 18:41:53 +00007118 rex = ImpCastExprToType(rex.take(), EltTy, CK_FloatingCast);
John McCalldaa8e4e2010-11-15 09:13:47 +00007119 if (order >= 0) {
John Wiegley429bb272011-04-08 18:41:53 +00007120 rex = ImpCastExprToType(rex.take(), lhsType, CK_VectorSplat);
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00007121 if (swapped) std::swap(rex, lex);
7122 return lhsType;
7123 }
Nate Begeman4119d1a2007-12-30 02:59:45 +00007124 }
7125 }
Mike Stump1eb44332009-09-09 15:08:12 +00007126
Nate Begemandde25982009-06-28 19:12:57 +00007127 // Vectors of different size or scalar and non-ext-vector are errors.
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00007128 Diag(Loc, diag::err_typecheck_vector_not_convertable)
John Wiegley429bb272011-04-08 18:41:53 +00007129 << lex.get()->getType() << rex.get()->getType()
7130 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00007131 return QualType();
Sebastian Redl22460502009-02-07 00:15:38 +00007132}
7133
Chris Lattner7ef655a2010-01-12 21:23:57 +00007134QualType Sema::CheckMultiplyDivideOperands(
John Wiegley429bb272011-04-08 18:41:53 +00007135 ExprResult &lex, ExprResult &rex, SourceLocation Loc, bool isCompAssign, bool isDiv) {
7136 if (lex.get()->getType()->isVectorType() || rex.get()->getType()->isVectorType())
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007137 return CheckVectorOperands(Loc, lex, rex);
Mike Stumpeed9cac2009-02-19 03:04:26 +00007138
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00007139 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign);
John Wiegley429bb272011-04-08 18:41:53 +00007140 if (lex.isInvalid() || rex.isInvalid())
7141 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007142
John Wiegley429bb272011-04-08 18:41:53 +00007143 if (!lex.get()->getType()->isArithmeticType() ||
7144 !rex.get()->getType()->isArithmeticType())
Chris Lattner7ef655a2010-01-12 21:23:57 +00007145 return InvalidOperands(Loc, lex, rex);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007146
Chris Lattner7ef655a2010-01-12 21:23:57 +00007147 // Check for division by zero.
7148 if (isDiv &&
John Wiegley429bb272011-04-08 18:41:53 +00007149 rex.get()->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull))
7150 DiagRuntimeBehavior(Loc, rex.get(), PDiag(diag::warn_division_by_zero)
7151 << rex.get()->getSourceRange());
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007152
Chris Lattner7ef655a2010-01-12 21:23:57 +00007153 return compType;
Reid Spencer5f016e22007-07-11 17:01:13 +00007154}
7155
Chris Lattner7ef655a2010-01-12 21:23:57 +00007156QualType Sema::CheckRemainderOperands(
John Wiegley429bb272011-04-08 18:41:53 +00007157 ExprResult &lex, ExprResult &rex, SourceLocation Loc, bool isCompAssign) {
7158 if (lex.get()->getType()->isVectorType() || rex.get()->getType()->isVectorType()) {
7159 if (lex.get()->getType()->hasIntegerRepresentation() &&
7160 rex.get()->getType()->hasIntegerRepresentation())
Daniel Dunbar523aa602009-01-05 22:55:36 +00007161 return CheckVectorOperands(Loc, lex, rex);
7162 return InvalidOperands(Loc, lex, rex);
7163 }
Steve Naroff90045e82007-07-13 23:32:42 +00007164
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00007165 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign);
John Wiegley429bb272011-04-08 18:41:53 +00007166 if (lex.isInvalid() || rex.isInvalid())
7167 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007168
John Wiegley429bb272011-04-08 18:41:53 +00007169 if (!lex.get()->getType()->isIntegerType() || !rex.get()->getType()->isIntegerType())
Chris Lattner7ef655a2010-01-12 21:23:57 +00007170 return InvalidOperands(Loc, lex, rex);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007171
Chris Lattner7ef655a2010-01-12 21:23:57 +00007172 // Check for remainder by zero.
John Wiegley429bb272011-04-08 18:41:53 +00007173 if (rex.get()->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull))
7174 DiagRuntimeBehavior(Loc, rex.get(), PDiag(diag::warn_remainder_by_zero)
7175 << rex.get()->getSourceRange());
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007176
Chris Lattner7ef655a2010-01-12 21:23:57 +00007177 return compType;
Reid Spencer5f016e22007-07-11 17:01:13 +00007178}
7179
Chris Lattner7ef655a2010-01-12 21:23:57 +00007180QualType Sema::CheckAdditionOperands( // C99 6.5.6
John Wiegley429bb272011-04-08 18:41:53 +00007181 ExprResult &lex, ExprResult &rex, SourceLocation Loc, QualType* CompLHSTy) {
7182 if (lex.get()->getType()->isVectorType() || rex.get()->getType()->isVectorType()) {
Eli Friedmanab3a8522009-03-28 01:22:36 +00007183 QualType compType = CheckVectorOperands(Loc, lex, rex);
7184 if (CompLHSTy) *CompLHSTy = compType;
7185 return compType;
7186 }
Steve Naroff49b45262007-07-13 16:58:59 +00007187
Eli Friedmanab3a8522009-03-28 01:22:36 +00007188 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy);
John Wiegley429bb272011-04-08 18:41:53 +00007189 if (lex.isInvalid() || rex.isInvalid())
7190 return QualType();
Eli Friedmand72d16e2008-05-18 18:08:51 +00007191
Reid Spencer5f016e22007-07-11 17:01:13 +00007192 // handle the common case first (both operands are arithmetic).
John Wiegley429bb272011-04-08 18:41:53 +00007193 if (lex.get()->getType()->isArithmeticType() &&
7194 rex.get()->getType()->isArithmeticType()) {
Eli Friedmanab3a8522009-03-28 01:22:36 +00007195 if (CompLHSTy) *CompLHSTy = compType;
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00007196 return compType;
Eli Friedmanab3a8522009-03-28 01:22:36 +00007197 }
Reid Spencer5f016e22007-07-11 17:01:13 +00007198
Eli Friedmand72d16e2008-05-18 18:08:51 +00007199 // Put any potential pointer into PExp
John Wiegley429bb272011-04-08 18:41:53 +00007200 Expr* PExp = lex.get(), *IExp = rex.get();
Steve Naroff58f9f2c2009-07-14 18:25:06 +00007201 if (IExp->getType()->isAnyPointerType())
Eli Friedmand72d16e2008-05-18 18:08:51 +00007202 std::swap(PExp, IExp);
7203
Steve Naroff58f9f2c2009-07-14 18:25:06 +00007204 if (PExp->getType()->isAnyPointerType()) {
Mike Stump1eb44332009-09-09 15:08:12 +00007205
Eli Friedmand72d16e2008-05-18 18:08:51 +00007206 if (IExp->getType()->isIntegerType()) {
Steve Naroff760e3c42009-07-13 21:20:41 +00007207 QualType PointeeTy = PExp->getType()->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00007208
Chris Lattnerb5f15622009-04-24 23:50:08 +00007209 // Check for arithmetic on pointers to incomplete types.
7210 if (PointeeTy->isVoidType()) {
Douglas Gregore7450f52009-03-24 19:52:54 +00007211 if (getLangOptions().CPlusPlus) {
7212 Diag(Loc, diag::err_typecheck_pointer_arith_void_type)
John Wiegley429bb272011-04-08 18:41:53 +00007213 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregor4ec339f2009-01-19 19:26:10 +00007214 return QualType();
Eli Friedmand72d16e2008-05-18 18:08:51 +00007215 }
Douglas Gregore7450f52009-03-24 19:52:54 +00007216
7217 // GNU extension: arithmetic on pointer to void
7218 Diag(Loc, diag::ext_gnu_void_ptr)
John Wiegley429bb272011-04-08 18:41:53 +00007219 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Chris Lattnerb5f15622009-04-24 23:50:08 +00007220 } else if (PointeeTy->isFunctionType()) {
Douglas Gregore7450f52009-03-24 19:52:54 +00007221 if (getLangOptions().CPlusPlus) {
7222 Diag(Loc, diag::err_typecheck_pointer_arith_function_type)
Chandler Carruthae0bafa2011-06-20 07:52:11 +00007223 << PExp->getType() << PExp->getSourceRange();
Douglas Gregore7450f52009-03-24 19:52:54 +00007224 return QualType();
7225 }
7226
7227 // GNU extension: arithmetic on pointer to function
7228 Diag(Loc, diag::ext_gnu_ptr_func_arith)
Chandler Carruthae0bafa2011-06-20 07:52:11 +00007229 << PExp->getType() << PExp->getSourceRange();
Steve Naroff9deaeca2009-07-13 21:32:29 +00007230 } else {
Steve Naroff760e3c42009-07-13 21:20:41 +00007231 // Check if we require a complete type.
Mike Stump1eb44332009-09-09 15:08:12 +00007232 if (((PExp->getType()->isPointerType() &&
Steve Naroff9deaeca2009-07-13 21:32:29 +00007233 !PExp->getType()->isDependentType()) ||
Steve Naroff760e3c42009-07-13 21:20:41 +00007234 PExp->getType()->isObjCObjectPointerType()) &&
7235 RequireCompleteType(Loc, PointeeTy,
Mike Stump1eb44332009-09-09 15:08:12 +00007236 PDiag(diag::err_typecheck_arithmetic_incomplete_type)
7237 << PExp->getSourceRange()
Anders Carlssond497ba72009-08-26 22:59:12 +00007238 << PExp->getType()))
Steve Naroff760e3c42009-07-13 21:20:41 +00007239 return QualType();
7240 }
Chris Lattnerb5f15622009-04-24 23:50:08 +00007241 // Diagnose bad cases where we step over interface counts.
John McCallc12c5bb2010-05-15 11:32:37 +00007242 if (PointeeTy->isObjCObjectType() && LangOpts.ObjCNonFragileABI) {
Chris Lattnerb5f15622009-04-24 23:50:08 +00007243 Diag(Loc, diag::err_arithmetic_nonfragile_interface)
7244 << PointeeTy << PExp->getSourceRange();
7245 return QualType();
7246 }
Mike Stump1eb44332009-09-09 15:08:12 +00007247
Eli Friedmanab3a8522009-03-28 01:22:36 +00007248 if (CompLHSTy) {
John Wiegley429bb272011-04-08 18:41:53 +00007249 QualType LHSTy = Context.isPromotableBitField(lex.get());
Eli Friedman04e83572009-08-20 04:21:42 +00007250 if (LHSTy.isNull()) {
John Wiegley429bb272011-04-08 18:41:53 +00007251 LHSTy = lex.get()->getType();
Eli Friedman04e83572009-08-20 04:21:42 +00007252 if (LHSTy->isPromotableIntegerType())
7253 LHSTy = Context.getPromotedIntegerType(LHSTy);
Douglas Gregor2d833e32009-05-02 00:36:19 +00007254 }
Eli Friedmanab3a8522009-03-28 01:22:36 +00007255 *CompLHSTy = LHSTy;
7256 }
Eli Friedmand72d16e2008-05-18 18:08:51 +00007257 return PExp->getType();
7258 }
7259 }
7260
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007261 return InvalidOperands(Loc, lex, rex);
Reid Spencer5f016e22007-07-11 17:01:13 +00007262}
7263
Chris Lattnereca7be62008-04-07 05:30:13 +00007264// C99 6.5.6
John Wiegley429bb272011-04-08 18:41:53 +00007265QualType Sema::CheckSubtractionOperands(ExprResult &lex, ExprResult &rex,
Eli Friedmanab3a8522009-03-28 01:22:36 +00007266 SourceLocation Loc, QualType* CompLHSTy) {
John Wiegley429bb272011-04-08 18:41:53 +00007267 if (lex.get()->getType()->isVectorType() || rex.get()->getType()->isVectorType()) {
Eli Friedmanab3a8522009-03-28 01:22:36 +00007268 QualType compType = CheckVectorOperands(Loc, lex, rex);
7269 if (CompLHSTy) *CompLHSTy = compType;
7270 return compType;
7271 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007272
Eli Friedmanab3a8522009-03-28 01:22:36 +00007273 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy);
John Wiegley429bb272011-04-08 18:41:53 +00007274 if (lex.isInvalid() || rex.isInvalid())
7275 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007276
Chris Lattner6e4ab612007-12-09 21:53:25 +00007277 // Enforce type constraints: C99 6.5.6p3.
Mike Stumpeed9cac2009-02-19 03:04:26 +00007278
Chris Lattner6e4ab612007-12-09 21:53:25 +00007279 // Handle the common case first (both operands are arithmetic).
John Wiegley429bb272011-04-08 18:41:53 +00007280 if (lex.get()->getType()->isArithmeticType() &&
7281 rex.get()->getType()->isArithmeticType()) {
Eli Friedmanab3a8522009-03-28 01:22:36 +00007282 if (CompLHSTy) *CompLHSTy = compType;
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00007283 return compType;
Eli Friedmanab3a8522009-03-28 01:22:36 +00007284 }
Mike Stump1eb44332009-09-09 15:08:12 +00007285
Chris Lattner6e4ab612007-12-09 21:53:25 +00007286 // Either ptr - int or ptr - ptr.
John Wiegley429bb272011-04-08 18:41:53 +00007287 if (lex.get()->getType()->isAnyPointerType()) {
7288 QualType lpointee = lex.get()->getType()->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007289
Douglas Gregore7450f52009-03-24 19:52:54 +00007290 // The LHS must be an completely-defined object type.
Douglas Gregorc983b862009-01-23 00:36:41 +00007291
Douglas Gregore7450f52009-03-24 19:52:54 +00007292 bool ComplainAboutVoid = false;
7293 Expr *ComplainAboutFunc = 0;
7294 if (lpointee->isVoidType()) {
7295 if (getLangOptions().CPlusPlus) {
7296 Diag(Loc, diag::err_typecheck_pointer_arith_void_type)
John Wiegley429bb272011-04-08 18:41:53 +00007297 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregore7450f52009-03-24 19:52:54 +00007298 return QualType();
7299 }
7300
7301 // GNU C extension: arithmetic on pointer to void
7302 ComplainAboutVoid = true;
7303 } else if (lpointee->isFunctionType()) {
7304 if (getLangOptions().CPlusPlus) {
7305 Diag(Loc, diag::err_typecheck_pointer_arith_function_type)
John Wiegley429bb272011-04-08 18:41:53 +00007306 << lex.get()->getType() << lex.get()->getSourceRange();
Chris Lattner6e4ab612007-12-09 21:53:25 +00007307 return QualType();
7308 }
Douglas Gregore7450f52009-03-24 19:52:54 +00007309
7310 // GNU C extension: arithmetic on pointer to function
John Wiegley429bb272011-04-08 18:41:53 +00007311 ComplainAboutFunc = lex.get();
Douglas Gregore7450f52009-03-24 19:52:54 +00007312 } else if (!lpointee->isDependentType() &&
Mike Stump1eb44332009-09-09 15:08:12 +00007313 RequireCompleteType(Loc, lpointee,
Anders Carlssond497ba72009-08-26 22:59:12 +00007314 PDiag(diag::err_typecheck_sub_ptr_object)
John Wiegley429bb272011-04-08 18:41:53 +00007315 << lex.get()->getSourceRange()
7316 << lex.get()->getType()))
Douglas Gregore7450f52009-03-24 19:52:54 +00007317 return QualType();
Chris Lattner6e4ab612007-12-09 21:53:25 +00007318
Chris Lattnerb5f15622009-04-24 23:50:08 +00007319 // Diagnose bad cases where we step over interface counts.
John McCallc12c5bb2010-05-15 11:32:37 +00007320 if (lpointee->isObjCObjectType() && LangOpts.ObjCNonFragileABI) {
Chris Lattnerb5f15622009-04-24 23:50:08 +00007321 Diag(Loc, diag::err_arithmetic_nonfragile_interface)
John Wiegley429bb272011-04-08 18:41:53 +00007322 << lpointee << lex.get()->getSourceRange();
Chris Lattnerb5f15622009-04-24 23:50:08 +00007323 return QualType();
7324 }
Mike Stump1eb44332009-09-09 15:08:12 +00007325
Chris Lattner6e4ab612007-12-09 21:53:25 +00007326 // The result type of a pointer-int computation is the pointer type.
John Wiegley429bb272011-04-08 18:41:53 +00007327 if (rex.get()->getType()->isIntegerType()) {
Douglas Gregore7450f52009-03-24 19:52:54 +00007328 if (ComplainAboutVoid)
7329 Diag(Loc, diag::ext_gnu_void_ptr)
John Wiegley429bb272011-04-08 18:41:53 +00007330 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregore7450f52009-03-24 19:52:54 +00007331 if (ComplainAboutFunc)
7332 Diag(Loc, diag::ext_gnu_ptr_func_arith)
Mike Stump1eb44332009-09-09 15:08:12 +00007333 << ComplainAboutFunc->getType()
Douglas Gregore7450f52009-03-24 19:52:54 +00007334 << ComplainAboutFunc->getSourceRange();
7335
John Wiegley429bb272011-04-08 18:41:53 +00007336 if (CompLHSTy) *CompLHSTy = lex.get()->getType();
7337 return lex.get()->getType();
Douglas Gregore7450f52009-03-24 19:52:54 +00007338 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007339
Chris Lattner6e4ab612007-12-09 21:53:25 +00007340 // Handle pointer-pointer subtractions.
John Wiegley429bb272011-04-08 18:41:53 +00007341 if (const PointerType *RHSPTy = rex.get()->getType()->getAs<PointerType>()) {
Eli Friedman8e54ad02008-02-08 01:19:44 +00007342 QualType rpointee = RHSPTy->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007343
Douglas Gregore7450f52009-03-24 19:52:54 +00007344 // RHS must be a completely-type object type.
7345 // Handle the GNU void* extension.
7346 if (rpointee->isVoidType()) {
7347 if (getLangOptions().CPlusPlus) {
7348 Diag(Loc, diag::err_typecheck_pointer_arith_void_type)
John Wiegley429bb272011-04-08 18:41:53 +00007349 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregore7450f52009-03-24 19:52:54 +00007350 return QualType();
7351 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007352
Douglas Gregore7450f52009-03-24 19:52:54 +00007353 ComplainAboutVoid = true;
7354 } else if (rpointee->isFunctionType()) {
7355 if (getLangOptions().CPlusPlus) {
7356 Diag(Loc, diag::err_typecheck_pointer_arith_function_type)
John Wiegley429bb272011-04-08 18:41:53 +00007357 << rex.get()->getType() << rex.get()->getSourceRange();
Chris Lattner6e4ab612007-12-09 21:53:25 +00007358 return QualType();
7359 }
Douglas Gregore7450f52009-03-24 19:52:54 +00007360
7361 // GNU extension: arithmetic on pointer to function
7362 if (!ComplainAboutFunc)
John Wiegley429bb272011-04-08 18:41:53 +00007363 ComplainAboutFunc = rex.get();
Douglas Gregore7450f52009-03-24 19:52:54 +00007364 } else if (!rpointee->isDependentType() &&
7365 RequireCompleteType(Loc, rpointee,
Anders Carlssond497ba72009-08-26 22:59:12 +00007366 PDiag(diag::err_typecheck_sub_ptr_object)
John Wiegley429bb272011-04-08 18:41:53 +00007367 << rex.get()->getSourceRange()
7368 << rex.get()->getType()))
Douglas Gregore7450f52009-03-24 19:52:54 +00007369 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007370
Eli Friedman88d936b2009-05-16 13:54:38 +00007371 if (getLangOptions().CPlusPlus) {
7372 // Pointee types must be the same: C++ [expr.add]
7373 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) {
7374 Diag(Loc, diag::err_typecheck_sub_ptr_compatible)
John Wiegley429bb272011-04-08 18:41:53 +00007375 << lex.get()->getType() << rex.get()->getType()
7376 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Eli Friedman88d936b2009-05-16 13:54:38 +00007377 return QualType();
7378 }
7379 } else {
7380 // Pointee types must be compatible C99 6.5.6p3
7381 if (!Context.typesAreCompatible(
7382 Context.getCanonicalType(lpointee).getUnqualifiedType(),
7383 Context.getCanonicalType(rpointee).getUnqualifiedType())) {
7384 Diag(Loc, diag::err_typecheck_sub_ptr_compatible)
John Wiegley429bb272011-04-08 18:41:53 +00007385 << lex.get()->getType() << rex.get()->getType()
7386 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Eli Friedman88d936b2009-05-16 13:54:38 +00007387 return QualType();
7388 }
Chris Lattner6e4ab612007-12-09 21:53:25 +00007389 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007390
Douglas Gregore7450f52009-03-24 19:52:54 +00007391 if (ComplainAboutVoid)
7392 Diag(Loc, diag::ext_gnu_void_ptr)
John Wiegley429bb272011-04-08 18:41:53 +00007393 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregore7450f52009-03-24 19:52:54 +00007394 if (ComplainAboutFunc)
7395 Diag(Loc, diag::ext_gnu_ptr_func_arith)
Mike Stump1eb44332009-09-09 15:08:12 +00007396 << ComplainAboutFunc->getType()
Douglas Gregore7450f52009-03-24 19:52:54 +00007397 << ComplainAboutFunc->getSourceRange();
Eli Friedmanab3a8522009-03-28 01:22:36 +00007398
John Wiegley429bb272011-04-08 18:41:53 +00007399 if (CompLHSTy) *CompLHSTy = lex.get()->getType();
Chris Lattner6e4ab612007-12-09 21:53:25 +00007400 return Context.getPointerDiffType();
7401 }
7402 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007403
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007404 return InvalidOperands(Loc, lex, rex);
Reid Spencer5f016e22007-07-11 17:01:13 +00007405}
7406
Douglas Gregor1274ccd2010-10-08 23:50:27 +00007407static bool isScopedEnumerationType(QualType T) {
7408 if (const EnumType *ET = dyn_cast<EnumType>(T))
7409 return ET->getDecl()->isScoped();
7410 return false;
7411}
7412
John Wiegley429bb272011-04-08 18:41:53 +00007413static void DiagnoseBadShiftValues(Sema& S, ExprResult &lex, ExprResult &rex,
Chandler Carruth21206d52011-02-23 23:34:11 +00007414 SourceLocation Loc, unsigned Opc,
7415 QualType LHSTy) {
7416 llvm::APSInt Right;
7417 // Check right/shifter operand
John Wiegley429bb272011-04-08 18:41:53 +00007418 if (rex.get()->isValueDependent() || !rex.get()->isIntegerConstantExpr(Right, S.Context))
Chandler Carruth21206d52011-02-23 23:34:11 +00007419 return;
7420
7421 if (Right.isNegative()) {
John Wiegley429bb272011-04-08 18:41:53 +00007422 S.DiagRuntimeBehavior(Loc, rex.get(),
Ted Kremenek082bf7a2011-03-01 18:09:31 +00007423 S.PDiag(diag::warn_shift_negative)
John Wiegley429bb272011-04-08 18:41:53 +00007424 << rex.get()->getSourceRange());
Chandler Carruth21206d52011-02-23 23:34:11 +00007425 return;
7426 }
7427 llvm::APInt LeftBits(Right.getBitWidth(),
John Wiegley429bb272011-04-08 18:41:53 +00007428 S.Context.getTypeSize(lex.get()->getType()));
Chandler Carruth21206d52011-02-23 23:34:11 +00007429 if (Right.uge(LeftBits)) {
John Wiegley429bb272011-04-08 18:41:53 +00007430 S.DiagRuntimeBehavior(Loc, rex.get(),
Ted Kremenek425a31e2011-03-01 19:13:22 +00007431 S.PDiag(diag::warn_shift_gt_typewidth)
John Wiegley429bb272011-04-08 18:41:53 +00007432 << rex.get()->getSourceRange());
Chandler Carruth21206d52011-02-23 23:34:11 +00007433 return;
7434 }
7435 if (Opc != BO_Shl)
7436 return;
7437
7438 // When left shifting an ICE which is signed, we can check for overflow which
7439 // according to C++ has undefined behavior ([expr.shift] 5.8/2). Unsigned
7440 // integers have defined behavior modulo one more than the maximum value
7441 // representable in the result type, so never warn for those.
7442 llvm::APSInt Left;
John Wiegley429bb272011-04-08 18:41:53 +00007443 if (lex.get()->isValueDependent() || !lex.get()->isIntegerConstantExpr(Left, S.Context) ||
Chandler Carruth21206d52011-02-23 23:34:11 +00007444 LHSTy->hasUnsignedIntegerRepresentation())
7445 return;
7446 llvm::APInt ResultBits =
7447 static_cast<llvm::APInt&>(Right) + Left.getMinSignedBits();
7448 if (LeftBits.uge(ResultBits))
7449 return;
7450 llvm::APSInt Result = Left.extend(ResultBits.getLimitedValue());
7451 Result = Result.shl(Right);
7452
Ted Kremenekfa821382011-06-15 00:54:52 +00007453 // Print the bit representation of the signed integer as an unsigned
7454 // hexadecimal number.
7455 llvm::SmallString<40> HexResult;
7456 Result.toString(HexResult, 16, /*Signed =*/false, /*Literal =*/true);
7457
Chandler Carruth21206d52011-02-23 23:34:11 +00007458 // If we are only missing a sign bit, this is less likely to result in actual
7459 // bugs -- if the result is cast back to an unsigned type, it will have the
7460 // expected value. Thus we place this behind a different warning that can be
7461 // turned off separately if needed.
7462 if (LeftBits == ResultBits - 1) {
Ted Kremenekfa821382011-06-15 00:54:52 +00007463 S.Diag(Loc, diag::warn_shift_result_sets_sign_bit)
7464 << HexResult.str() << LHSTy
John Wiegley429bb272011-04-08 18:41:53 +00007465 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Chandler Carruth21206d52011-02-23 23:34:11 +00007466 return;
7467 }
7468
7469 S.Diag(Loc, diag::warn_shift_result_gt_typewidth)
Ted Kremenekfa821382011-06-15 00:54:52 +00007470 << HexResult.str() << Result.getMinSignedBits() << LHSTy
John Wiegley429bb272011-04-08 18:41:53 +00007471 << Left.getBitWidth() << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Chandler Carruth21206d52011-02-23 23:34:11 +00007472}
7473
Chris Lattnereca7be62008-04-07 05:30:13 +00007474// C99 6.5.7
John Wiegley429bb272011-04-08 18:41:53 +00007475QualType Sema::CheckShiftOperands(ExprResult &lex, ExprResult &rex, SourceLocation Loc,
Chandler Carruth21206d52011-02-23 23:34:11 +00007476 unsigned Opc, bool isCompAssign) {
Chris Lattnerca5eede2007-12-12 05:47:28 +00007477 // C99 6.5.7p2: Each of the operands shall have integer type.
John Wiegley429bb272011-04-08 18:41:53 +00007478 if (!lex.get()->getType()->hasIntegerRepresentation() ||
7479 !rex.get()->getType()->hasIntegerRepresentation())
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007480 return InvalidOperands(Loc, lex, rex);
Mike Stumpeed9cac2009-02-19 03:04:26 +00007481
Douglas Gregor1274ccd2010-10-08 23:50:27 +00007482 // C++0x: Don't allow scoped enums. FIXME: Use something better than
7483 // hasIntegerRepresentation() above instead of this.
John Wiegley429bb272011-04-08 18:41:53 +00007484 if (isScopedEnumerationType(lex.get()->getType()) ||
7485 isScopedEnumerationType(rex.get()->getType())) {
Douglas Gregor1274ccd2010-10-08 23:50:27 +00007486 return InvalidOperands(Loc, lex, rex);
7487 }
7488
Nate Begeman2207d792009-10-25 02:26:48 +00007489 // Vector shifts promote their scalar inputs to vector type.
John Wiegley429bb272011-04-08 18:41:53 +00007490 if (lex.get()->getType()->isVectorType() || rex.get()->getType()->isVectorType())
Nate Begeman2207d792009-10-25 02:26:48 +00007491 return CheckVectorOperands(Loc, lex, rex);
7492
Chris Lattnerca5eede2007-12-12 05:47:28 +00007493 // Shifts don't perform usual arithmetic conversions, they just do integer
7494 // promotions on each operand. C99 6.5.7p3
Eli Friedmanab3a8522009-03-28 01:22:36 +00007495
John McCall1bc80af2010-12-16 19:28:59 +00007496 // For the LHS, do usual unary conversions, but then reset them away
7497 // if this is a compound assignment.
John Wiegley429bb272011-04-08 18:41:53 +00007498 ExprResult old_lex = lex;
7499 lex = UsualUnaryConversions(lex.take());
7500 if (lex.isInvalid())
7501 return QualType();
7502 QualType LHSTy = lex.get()->getType();
John McCall1bc80af2010-12-16 19:28:59 +00007503 if (isCompAssign) lex = old_lex;
7504
7505 // The RHS is simpler.
John Wiegley429bb272011-04-08 18:41:53 +00007506 rex = UsualUnaryConversions(rex.take());
7507 if (rex.isInvalid())
7508 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007509
Ryan Flynnd0439682009-08-07 16:20:20 +00007510 // Sanity-check shift operands
Chandler Carruth21206d52011-02-23 23:34:11 +00007511 DiagnoseBadShiftValues(*this, lex, rex, Loc, Opc, LHSTy);
Ryan Flynnd0439682009-08-07 16:20:20 +00007512
Chris Lattnerca5eede2007-12-12 05:47:28 +00007513 // "The type of the result is that of the promoted left operand."
Eli Friedmanab3a8522009-03-28 01:22:36 +00007514 return LHSTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00007515}
7516
Chandler Carruth99919472010-07-10 12:30:03 +00007517static bool IsWithinTemplateSpecialization(Decl *D) {
7518 if (DeclContext *DC = D->getDeclContext()) {
7519 if (isa<ClassTemplateSpecializationDecl>(DC))
7520 return true;
7521 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(DC))
7522 return FD->isFunctionTemplateSpecialization();
7523 }
7524 return false;
7525}
7526
Douglas Gregor0c6db942009-05-04 06:07:12 +00007527// C99 6.5.8, C++ [expr.rel]
John Wiegley429bb272011-04-08 18:41:53 +00007528QualType Sema::CheckCompareOperands(ExprResult &lex, ExprResult &rex, SourceLocation Loc,
Douglas Gregora86b8322009-04-06 18:45:53 +00007529 unsigned OpaqueOpc, bool isRelational) {
John McCall2de56d12010-08-25 11:45:40 +00007530 BinaryOperatorKind Opc = (BinaryOperatorKind) OpaqueOpc;
Douglas Gregora86b8322009-04-06 18:45:53 +00007531
Chris Lattner02dd4b12009-12-05 05:40:13 +00007532 // Handle vector comparisons separately.
John Wiegley429bb272011-04-08 18:41:53 +00007533 if (lex.get()->getType()->isVectorType() || rex.get()->getType()->isVectorType())
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007534 return CheckVectorCompareOperands(lex, rex, Loc, isRelational);
Mike Stumpeed9cac2009-02-19 03:04:26 +00007535
John Wiegley429bb272011-04-08 18:41:53 +00007536 QualType lType = lex.get()->getType();
7537 QualType rType = rex.get()->getType();
Douglas Gregorfadb53b2011-03-12 01:48:56 +00007538
John Wiegley429bb272011-04-08 18:41:53 +00007539 Expr *LHSStripped = lex.get()->IgnoreParenImpCasts();
7540 Expr *RHSStripped = rex.get()->IgnoreParenImpCasts();
Chandler Carruth543cb652011-02-17 08:37:06 +00007541 QualType LHSStrippedType = LHSStripped->getType();
7542 QualType RHSStrippedType = RHSStripped->getType();
7543
Douglas Gregorfadb53b2011-03-12 01:48:56 +00007544
7545
Chandler Carruth543cb652011-02-17 08:37:06 +00007546 // Two different enums will raise a warning when compared.
7547 if (const EnumType *LHSEnumType = LHSStrippedType->getAs<EnumType>()) {
7548 if (const EnumType *RHSEnumType = RHSStrippedType->getAs<EnumType>()) {
7549 if (LHSEnumType->getDecl()->getIdentifier() &&
7550 RHSEnumType->getDecl()->getIdentifier() &&
7551 !Context.hasSameUnqualifiedType(LHSStrippedType, RHSStrippedType)) {
7552 Diag(Loc, diag::warn_comparison_of_mixed_enum_types)
7553 << LHSStrippedType << RHSStrippedType
John Wiegley429bb272011-04-08 18:41:53 +00007554 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Chandler Carruth543cb652011-02-17 08:37:06 +00007555 }
7556 }
7557 }
7558
Douglas Gregor8eee1192010-06-22 22:12:46 +00007559 if (!lType->hasFloatingRepresentation() &&
Ted Kremenekfbcb0eb2010-09-16 00:03:01 +00007560 !(lType->isBlockPointerType() && isRelational) &&
John Wiegley429bb272011-04-08 18:41:53 +00007561 !lex.get()->getLocStart().isMacroID() &&
7562 !rex.get()->getLocStart().isMacroID()) {
Chris Lattner55660a72009-03-08 19:39:53 +00007563 // For non-floating point types, check for self-comparisons of the form
7564 // x == x, x != x, x < x, etc. These always evaluate to a constant, and
7565 // often indicate logic errors in the program.
Chandler Carruth64d092c2010-07-12 06:23:38 +00007566 //
7567 // NOTE: Don't warn about comparison expressions resulting from macro
7568 // expansion. Also don't warn about comparisons which are only self
7569 // comparisons within a template specialization. The warnings should catch
7570 // obvious cases in the definition of the template anyways. The idea is to
7571 // warn when the typed comparison operator will always evaluate to the same
7572 // result.
Chandler Carruth99919472010-07-10 12:30:03 +00007573 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) {
Douglas Gregord64fdd02010-06-08 19:50:34 +00007574 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) {
Ted Kremenekfbcb0eb2010-09-16 00:03:01 +00007575 if (DRL->getDecl() == DRR->getDecl() &&
Chandler Carruth99919472010-07-10 12:30:03 +00007576 !IsWithinTemplateSpecialization(DRL->getDecl())) {
Ted Kremenek351ba912011-02-23 01:52:04 +00007577 DiagRuntimeBehavior(Loc, 0, PDiag(diag::warn_comparison_always)
Douglas Gregord64fdd02010-06-08 19:50:34 +00007578 << 0 // self-
John McCall2de56d12010-08-25 11:45:40 +00007579 << (Opc == BO_EQ
7580 || Opc == BO_LE
7581 || Opc == BO_GE));
Douglas Gregord64fdd02010-06-08 19:50:34 +00007582 } else if (lType->isArrayType() && rType->isArrayType() &&
7583 !DRL->getDecl()->getType()->isReferenceType() &&
7584 !DRR->getDecl()->getType()->isReferenceType()) {
7585 // what is it always going to eval to?
7586 char always_evals_to;
7587 switch(Opc) {
John McCall2de56d12010-08-25 11:45:40 +00007588 case BO_EQ: // e.g. array1 == array2
Douglas Gregord64fdd02010-06-08 19:50:34 +00007589 always_evals_to = 0; // false
7590 break;
John McCall2de56d12010-08-25 11:45:40 +00007591 case BO_NE: // e.g. array1 != array2
Douglas Gregord64fdd02010-06-08 19:50:34 +00007592 always_evals_to = 1; // true
7593 break;
7594 default:
7595 // best we can say is 'a constant'
7596 always_evals_to = 2; // e.g. array1 <= array2
7597 break;
7598 }
Ted Kremenek351ba912011-02-23 01:52:04 +00007599 DiagRuntimeBehavior(Loc, 0, PDiag(diag::warn_comparison_always)
Douglas Gregord64fdd02010-06-08 19:50:34 +00007600 << 1 // array
7601 << always_evals_to);
7602 }
7603 }
Chandler Carruth99919472010-07-10 12:30:03 +00007604 }
Mike Stump1eb44332009-09-09 15:08:12 +00007605
Chris Lattner55660a72009-03-08 19:39:53 +00007606 if (isa<CastExpr>(LHSStripped))
7607 LHSStripped = LHSStripped->IgnoreParenCasts();
7608 if (isa<CastExpr>(RHSStripped))
7609 RHSStripped = RHSStripped->IgnoreParenCasts();
Mike Stump1eb44332009-09-09 15:08:12 +00007610
Chris Lattner55660a72009-03-08 19:39:53 +00007611 // Warn about comparisons against a string constant (unless the other
7612 // operand is null), the user probably wants strcmp.
Douglas Gregora86b8322009-04-06 18:45:53 +00007613 Expr *literalString = 0;
7614 Expr *literalStringStripped = 0;
Chris Lattner55660a72009-03-08 19:39:53 +00007615 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) &&
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007616 !RHSStripped->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00007617 Expr::NPC_ValueDependentIsNull)) {
John Wiegley429bb272011-04-08 18:41:53 +00007618 literalString = lex.get();
Douglas Gregora86b8322009-04-06 18:45:53 +00007619 literalStringStripped = LHSStripped;
Mike Stumpac5fc7c2009-08-04 21:02:39 +00007620 } else if ((isa<StringLiteral>(RHSStripped) ||
7621 isa<ObjCEncodeExpr>(RHSStripped)) &&
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007622 !LHSStripped->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00007623 Expr::NPC_ValueDependentIsNull)) {
John Wiegley429bb272011-04-08 18:41:53 +00007624 literalString = rex.get();
Douglas Gregora86b8322009-04-06 18:45:53 +00007625 literalStringStripped = RHSStripped;
7626 }
7627
7628 if (literalString) {
7629 std::string resultComparison;
7630 switch (Opc) {
John McCall2de56d12010-08-25 11:45:40 +00007631 case BO_LT: resultComparison = ") < 0"; break;
7632 case BO_GT: resultComparison = ") > 0"; break;
7633 case BO_LE: resultComparison = ") <= 0"; break;
7634 case BO_GE: resultComparison = ") >= 0"; break;
7635 case BO_EQ: resultComparison = ") == 0"; break;
7636 case BO_NE: resultComparison = ") != 0"; break;
Douglas Gregora86b8322009-04-06 18:45:53 +00007637 default: assert(false && "Invalid comparison operator");
7638 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007639
Ted Kremenek351ba912011-02-23 01:52:04 +00007640 DiagRuntimeBehavior(Loc, 0,
Douglas Gregord1e4d9b2010-01-12 23:18:54 +00007641 PDiag(diag::warn_stringcompare)
7642 << isa<ObjCEncodeExpr>(literalStringStripped)
Ted Kremenek03a4bee2010-04-09 20:26:53 +00007643 << literalString->getSourceRange());
Douglas Gregora86b8322009-04-06 18:45:53 +00007644 }
Ted Kremenek3ca0bf22007-10-29 16:58:49 +00007645 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007646
Douglas Gregord64fdd02010-06-08 19:50:34 +00007647 // C99 6.5.8p3 / C99 6.5.9p4
John Wiegley429bb272011-04-08 18:41:53 +00007648 if (lex.get()->getType()->isArithmeticType() && rex.get()->getType()->isArithmeticType()) {
Douglas Gregord64fdd02010-06-08 19:50:34 +00007649 UsualArithmeticConversions(lex, rex);
John Wiegley429bb272011-04-08 18:41:53 +00007650 if (lex.isInvalid() || rex.isInvalid())
7651 return QualType();
7652 }
Douglas Gregord64fdd02010-06-08 19:50:34 +00007653 else {
John Wiegley429bb272011-04-08 18:41:53 +00007654 lex = UsualUnaryConversions(lex.take());
7655 if (lex.isInvalid())
7656 return QualType();
7657
7658 rex = UsualUnaryConversions(rex.take());
7659 if (rex.isInvalid())
7660 return QualType();
Douglas Gregord64fdd02010-06-08 19:50:34 +00007661 }
7662
John Wiegley429bb272011-04-08 18:41:53 +00007663 lType = lex.get()->getType();
7664 rType = rex.get()->getType();
Douglas Gregord64fdd02010-06-08 19:50:34 +00007665
Douglas Gregor447b69e2008-11-19 03:25:36 +00007666 // The result of comparisons is 'bool' in C++, 'int' in C.
Argyrios Kyrtzidis16f744b2011-02-18 20:55:15 +00007667 QualType ResultTy = Context.getLogicalOperationType();
Douglas Gregor447b69e2008-11-19 03:25:36 +00007668
Chris Lattnera5937dd2007-08-26 01:18:55 +00007669 if (isRelational) {
7670 if (lType->isRealType() && rType->isRealType())
Douglas Gregor447b69e2008-11-19 03:25:36 +00007671 return ResultTy;
Chris Lattnera5937dd2007-08-26 01:18:55 +00007672 } else {
Ted Kremenek72cb1ae2007-10-29 17:13:39 +00007673 // Check for comparisons of floating point operands using != and ==.
Douglas Gregor8eee1192010-06-22 22:12:46 +00007674 if (lType->hasFloatingRepresentation())
John Wiegley429bb272011-04-08 18:41:53 +00007675 CheckFloatComparison(Loc, lex.get(), rex.get());
Mike Stumpeed9cac2009-02-19 03:04:26 +00007676
Chris Lattnera5937dd2007-08-26 01:18:55 +00007677 if (lType->isArithmeticType() && rType->isArithmeticType())
Douglas Gregor447b69e2008-11-19 03:25:36 +00007678 return ResultTy;
Chris Lattnera5937dd2007-08-26 01:18:55 +00007679 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007680
John Wiegley429bb272011-04-08 18:41:53 +00007681 bool LHSIsNull = lex.get()->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00007682 Expr::NPC_ValueDependentIsNull);
John Wiegley429bb272011-04-08 18:41:53 +00007683 bool RHSIsNull = rex.get()->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00007684 Expr::NPC_ValueDependentIsNull);
Mike Stumpeed9cac2009-02-19 03:04:26 +00007685
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007686 // All of the following pointer-related warnings are GCC extensions, except
7687 // when handling null pointer constants.
Steve Naroff77878cc2007-08-27 04:08:11 +00007688 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2
Chris Lattnerbc896f52008-04-03 05:07:25 +00007689 QualType LCanPointeeTy =
Ted Kremenek6217b802009-07-29 21:53:49 +00007690 Context.getCanonicalType(lType->getAs<PointerType>()->getPointeeType());
Chris Lattnerbc896f52008-04-03 05:07:25 +00007691 QualType RCanPointeeTy =
Ted Kremenek6217b802009-07-29 21:53:49 +00007692 Context.getCanonicalType(rType->getAs<PointerType>()->getPointeeType());
Mike Stumpeed9cac2009-02-19 03:04:26 +00007693
Douglas Gregor0c6db942009-05-04 06:07:12 +00007694 if (getLangOptions().CPlusPlus) {
Eli Friedman3075e762009-08-23 00:27:47 +00007695 if (LCanPointeeTy == RCanPointeeTy)
7696 return ResultTy;
Fariborz Jahanian51874dd2009-12-21 18:19:17 +00007697 if (!isRelational &&
7698 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) {
7699 // Valid unless comparison between non-null pointer and function pointer
7700 // This is a gcc extension compatibility comparison.
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007701 // In a SFINAE context, we treat this as a hard error to maintain
7702 // conformance with the C++ standard.
Fariborz Jahanian51874dd2009-12-21 18:19:17 +00007703 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType())
7704 && !LHSIsNull && !RHSIsNull) {
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007705 Diag(Loc,
7706 isSFINAEContext()?
7707 diag::err_typecheck_comparison_of_fptr_to_void
7708 : diag::ext_typecheck_comparison_of_fptr_to_void)
John Wiegley429bb272011-04-08 18:41:53 +00007709 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007710
7711 if (isSFINAEContext())
7712 return QualType();
7713
John Wiegley429bb272011-04-08 18:41:53 +00007714 rex = ImpCastExprToType(rex.take(), lType, CK_BitCast);
Fariborz Jahanian51874dd2009-12-21 18:19:17 +00007715 return ResultTy;
7716 }
7717 }
Anders Carlsson0c8209e2010-11-04 03:17:43 +00007718
Douglas Gregor0c6db942009-05-04 06:07:12 +00007719 // C++ [expr.rel]p2:
7720 // [...] Pointer conversions (4.10) and qualification
7721 // conversions (4.4) are performed on pointer operands (or on
7722 // a pointer operand and a null pointer constant) to bring
7723 // them to their composite pointer type. [...]
7724 //
Douglas Gregor20b3e992009-08-24 17:42:35 +00007725 // C++ [expr.eq]p1 uses the same notion for (in)equality
Douglas Gregor0c6db942009-05-04 06:07:12 +00007726 // comparisons of pointers.
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00007727 bool NonStandardCompositeType = false;
Douglas Gregor8f00dcf2010-04-16 23:20:25 +00007728 QualType T = FindCompositePointerType(Loc, lex, rex,
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00007729 isSFINAEContext()? 0 : &NonStandardCompositeType);
Douglas Gregor0c6db942009-05-04 06:07:12 +00007730 if (T.isNull()) {
7731 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers)
John Wiegley429bb272011-04-08 18:41:53 +00007732 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregor0c6db942009-05-04 06:07:12 +00007733 return QualType();
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00007734 } else if (NonStandardCompositeType) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007735 Diag(Loc,
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00007736 diag::ext_typecheck_comparison_of_distinct_pointers_nonstandard)
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007737 << lType << rType << T
John Wiegley429bb272011-04-08 18:41:53 +00007738 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregor0c6db942009-05-04 06:07:12 +00007739 }
7740
John Wiegley429bb272011-04-08 18:41:53 +00007741 lex = ImpCastExprToType(lex.take(), T, CK_BitCast);
7742 rex = ImpCastExprToType(rex.take(), T, CK_BitCast);
Douglas Gregor0c6db942009-05-04 06:07:12 +00007743 return ResultTy;
7744 }
Eli Friedman3075e762009-08-23 00:27:47 +00007745 // C99 6.5.9p2 and C99 6.5.8p2
7746 if (Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(),
7747 RCanPointeeTy.getUnqualifiedType())) {
7748 // Valid unless a relational comparison of function pointers
7749 if (isRelational && LCanPointeeTy->isFunctionType()) {
7750 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers)
John Wiegley429bb272011-04-08 18:41:53 +00007751 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Eli Friedman3075e762009-08-23 00:27:47 +00007752 }
7753 } else if (!isRelational &&
7754 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) {
7755 // Valid unless comparison between non-null pointer and function pointer
7756 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType())
7757 && !LHSIsNull && !RHSIsNull) {
7758 Diag(Loc, diag::ext_typecheck_comparison_of_fptr_to_void)
John Wiegley429bb272011-04-08 18:41:53 +00007759 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Eli Friedman3075e762009-08-23 00:27:47 +00007760 }
7761 } else {
7762 // Invalid
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00007763 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers)
John Wiegley429bb272011-04-08 18:41:53 +00007764 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00007765 }
John McCall34d6f932011-03-11 04:25:25 +00007766 if (LCanPointeeTy != RCanPointeeTy) {
7767 if (LHSIsNull && !RHSIsNull)
John Wiegley429bb272011-04-08 18:41:53 +00007768 lex = ImpCastExprToType(lex.take(), rType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00007769 else
John Wiegley429bb272011-04-08 18:41:53 +00007770 rex = ImpCastExprToType(rex.take(), lType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00007771 }
Douglas Gregor447b69e2008-11-19 03:25:36 +00007772 return ResultTy;
Steve Naroffe77fd3c2007-08-16 21:48:38 +00007773 }
Mike Stump1eb44332009-09-09 15:08:12 +00007774
Sebastian Redl6e8ed162009-05-10 18:38:11 +00007775 if (getLangOptions().CPlusPlus) {
Anders Carlsson0c8209e2010-11-04 03:17:43 +00007776 // Comparison of nullptr_t with itself.
7777 if (lType->isNullPtrType() && rType->isNullPtrType())
7778 return ResultTy;
7779
Mike Stump1eb44332009-09-09 15:08:12 +00007780 // Comparison of pointers with null pointer constants and equality
Douglas Gregor20b3e992009-08-24 17:42:35 +00007781 // comparisons of member pointers to null pointer constants.
Mike Stump1eb44332009-09-09 15:08:12 +00007782 if (RHSIsNull &&
Douglas Gregor17e37c72011-06-01 15:12:24 +00007783 ((lType->isAnyPointerType() || lType->isNullPtrType()) ||
Douglas Gregor16cd4b72011-06-16 18:52:05 +00007784 (!isRelational &&
7785 (lType->isMemberPointerType() || lType->isBlockPointerType())))) {
John Wiegley429bb272011-04-08 18:41:53 +00007786 rex = ImpCastExprToType(rex.take(), lType,
Douglas Gregor443c2122010-08-07 13:36:37 +00007787 lType->isMemberPointerType()
John McCall2de56d12010-08-25 11:45:40 +00007788 ? CK_NullToMemberPointer
John McCall404cd162010-11-13 01:35:44 +00007789 : CK_NullToPointer);
Sebastian Redl6e8ed162009-05-10 18:38:11 +00007790 return ResultTy;
7791 }
Douglas Gregor20b3e992009-08-24 17:42:35 +00007792 if (LHSIsNull &&
Douglas Gregor17e37c72011-06-01 15:12:24 +00007793 ((rType->isAnyPointerType() || rType->isNullPtrType()) ||
Douglas Gregor16cd4b72011-06-16 18:52:05 +00007794 (!isRelational &&
7795 (rType->isMemberPointerType() || rType->isBlockPointerType())))) {
John Wiegley429bb272011-04-08 18:41:53 +00007796 lex = ImpCastExprToType(lex.take(), rType,
Douglas Gregor443c2122010-08-07 13:36:37 +00007797 rType->isMemberPointerType()
John McCall2de56d12010-08-25 11:45:40 +00007798 ? CK_NullToMemberPointer
John McCall404cd162010-11-13 01:35:44 +00007799 : CK_NullToPointer);
Sebastian Redl6e8ed162009-05-10 18:38:11 +00007800 return ResultTy;
7801 }
Douglas Gregor20b3e992009-08-24 17:42:35 +00007802
7803 // Comparison of member pointers.
Mike Stump1eb44332009-09-09 15:08:12 +00007804 if (!isRelational &&
Douglas Gregor20b3e992009-08-24 17:42:35 +00007805 lType->isMemberPointerType() && rType->isMemberPointerType()) {
7806 // C++ [expr.eq]p2:
Mike Stump1eb44332009-09-09 15:08:12 +00007807 // In addition, pointers to members can be compared, or a pointer to
7808 // member and a null pointer constant. Pointer to member conversions
7809 // (4.11) and qualification conversions (4.4) are performed to bring
7810 // them to a common type. If one operand is a null pointer constant,
7811 // the common type is the type of the other operand. Otherwise, the
7812 // common type is a pointer to member type similar (4.4) to the type
7813 // of one of the operands, with a cv-qualification signature (4.4)
7814 // that is the union of the cv-qualification signatures of the operand
Douglas Gregor20b3e992009-08-24 17:42:35 +00007815 // types.
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00007816 bool NonStandardCompositeType = false;
Douglas Gregor8f00dcf2010-04-16 23:20:25 +00007817 QualType T = FindCompositePointerType(Loc, lex, rex,
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00007818 isSFINAEContext()? 0 : &NonStandardCompositeType);
Douglas Gregor20b3e992009-08-24 17:42:35 +00007819 if (T.isNull()) {
7820 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers)
John Wiegley429bb272011-04-08 18:41:53 +00007821 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregor20b3e992009-08-24 17:42:35 +00007822 return QualType();
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00007823 } else if (NonStandardCompositeType) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007824 Diag(Loc,
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00007825 diag::ext_typecheck_comparison_of_distinct_pointers_nonstandard)
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007826 << lType << rType << T
John Wiegley429bb272011-04-08 18:41:53 +00007827 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregor20b3e992009-08-24 17:42:35 +00007828 }
Mike Stump1eb44332009-09-09 15:08:12 +00007829
John Wiegley429bb272011-04-08 18:41:53 +00007830 lex = ImpCastExprToType(lex.take(), T, CK_BitCast);
7831 rex = ImpCastExprToType(rex.take(), T, CK_BitCast);
Douglas Gregor20b3e992009-08-24 17:42:35 +00007832 return ResultTy;
7833 }
Douglas Gregor90566c02011-03-01 17:16:20 +00007834
7835 // Handle scoped enumeration types specifically, since they don't promote
7836 // to integers.
John Wiegley429bb272011-04-08 18:41:53 +00007837 if (lex.get()->getType()->isEnumeralType() &&
7838 Context.hasSameUnqualifiedType(lex.get()->getType(), rex.get()->getType()))
Douglas Gregor90566c02011-03-01 17:16:20 +00007839 return ResultTy;
Sebastian Redl6e8ed162009-05-10 18:38:11 +00007840 }
Mike Stump1eb44332009-09-09 15:08:12 +00007841
Steve Naroff1c7d0672008-09-04 15:10:53 +00007842 // Handle block pointer types.
Mike Stumpdd3e1662009-05-07 03:14:14 +00007843 if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) {
Ted Kremenek6217b802009-07-29 21:53:49 +00007844 QualType lpointee = lType->getAs<BlockPointerType>()->getPointeeType();
7845 QualType rpointee = rType->getAs<BlockPointerType>()->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007846
Steve Naroff1c7d0672008-09-04 15:10:53 +00007847 if (!LHSIsNull && !RHSIsNull &&
Eli Friedman26784c12009-06-08 05:08:54 +00007848 !Context.typesAreCompatible(lpointee, rpointee)) {
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00007849 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
John Wiegley429bb272011-04-08 18:41:53 +00007850 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Steve Naroff1c7d0672008-09-04 15:10:53 +00007851 }
John Wiegley429bb272011-04-08 18:41:53 +00007852 rex = ImpCastExprToType(rex.take(), lType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00007853 return ResultTy;
Steve Naroff1c7d0672008-09-04 15:10:53 +00007854 }
John Wiegley429bb272011-04-08 18:41:53 +00007855
Steve Naroff59f53942008-09-28 01:11:11 +00007856 // Allow block pointers to be compared with null pointer constants.
Mike Stumpdd3e1662009-05-07 03:14:14 +00007857 if (!isRelational
7858 && ((lType->isBlockPointerType() && rType->isPointerType())
7859 || (lType->isPointerType() && rType->isBlockPointerType()))) {
Steve Naroff59f53942008-09-28 01:11:11 +00007860 if (!LHSIsNull && !RHSIsNull) {
John McCall34d6f932011-03-11 04:25:25 +00007861 if (!((rType->isPointerType() && rType->castAs<PointerType>()
Mike Stumpdd3e1662009-05-07 03:14:14 +00007862 ->getPointeeType()->isVoidType())
John McCall34d6f932011-03-11 04:25:25 +00007863 || (lType->isPointerType() && lType->castAs<PointerType>()
Mike Stumpdd3e1662009-05-07 03:14:14 +00007864 ->getPointeeType()->isVoidType())))
7865 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
John Wiegley429bb272011-04-08 18:41:53 +00007866 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Steve Naroff59f53942008-09-28 01:11:11 +00007867 }
John McCall34d6f932011-03-11 04:25:25 +00007868 if (LHSIsNull && !RHSIsNull)
John Wiegley429bb272011-04-08 18:41:53 +00007869 lex = ImpCastExprToType(lex.take(), rType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00007870 else
John Wiegley429bb272011-04-08 18:41:53 +00007871 rex = ImpCastExprToType(rex.take(), lType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00007872 return ResultTy;
Steve Naroff59f53942008-09-28 01:11:11 +00007873 }
Steve Naroff1c7d0672008-09-04 15:10:53 +00007874
John McCall34d6f932011-03-11 04:25:25 +00007875 if (lType->isObjCObjectPointerType() || rType->isObjCObjectPointerType()) {
7876 const PointerType *LPT = lType->getAs<PointerType>();
7877 const PointerType *RPT = rType->getAs<PointerType>();
7878 if (LPT || RPT) {
7879 bool LPtrToVoid = LPT ? LPT->getPointeeType()->isVoidType() : false;
7880 bool RPtrToVoid = RPT ? RPT->getPointeeType()->isVoidType() : false;
Mike Stumpeed9cac2009-02-19 03:04:26 +00007881
Steve Naroffa8069f12008-11-17 19:49:16 +00007882 if (!LPtrToVoid && !RPtrToVoid &&
7883 !Context.typesAreCompatible(lType, rType)) {
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00007884 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers)
John Wiegley429bb272011-04-08 18:41:53 +00007885 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Steve Naroffa5ad8632008-10-27 10:33:19 +00007886 }
John McCall34d6f932011-03-11 04:25:25 +00007887 if (LHSIsNull && !RHSIsNull)
John Wiegley429bb272011-04-08 18:41:53 +00007888 lex = ImpCastExprToType(lex.take(), rType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00007889 else
John Wiegley429bb272011-04-08 18:41:53 +00007890 rex = ImpCastExprToType(rex.take(), lType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00007891 return ResultTy;
Steve Naroff87f3b932008-10-20 18:19:10 +00007892 }
Steve Naroff14108da2009-07-10 23:34:53 +00007893 if (lType->isObjCObjectPointerType() && rType->isObjCObjectPointerType()) {
Chris Lattner6365e3e2009-08-22 18:58:31 +00007894 if (!Context.areComparableObjCPointerTypes(lType, rType))
Steve Naroff14108da2009-07-10 23:34:53 +00007895 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers)
John Wiegley429bb272011-04-08 18:41:53 +00007896 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
John McCall34d6f932011-03-11 04:25:25 +00007897 if (LHSIsNull && !RHSIsNull)
John Wiegley429bb272011-04-08 18:41:53 +00007898 lex = ImpCastExprToType(lex.take(), rType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00007899 else
John Wiegley429bb272011-04-08 18:41:53 +00007900 rex = ImpCastExprToType(rex.take(), lType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00007901 return ResultTy;
Steve Naroff20373222008-06-03 14:04:54 +00007902 }
Fariborz Jahanian7359f042007-12-20 01:06:58 +00007903 }
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007904 if ((lType->isAnyPointerType() && rType->isIntegerType()) ||
7905 (lType->isIntegerType() && rType->isAnyPointerType())) {
Chris Lattner06c0f5b2009-08-23 00:03:44 +00007906 unsigned DiagID = 0;
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007907 bool isError = false;
7908 if ((LHSIsNull && lType->isIntegerType()) ||
7909 (RHSIsNull && rType->isIntegerType())) {
7910 if (isRelational && !getLangOptions().CPlusPlus)
Chris Lattner06c0f5b2009-08-23 00:03:44 +00007911 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero;
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007912 } else if (isRelational && !getLangOptions().CPlusPlus)
Chris Lattner06c0f5b2009-08-23 00:03:44 +00007913 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer;
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007914 else if (getLangOptions().CPlusPlus) {
7915 DiagID = diag::err_typecheck_comparison_of_pointer_integer;
7916 isError = true;
7917 } else
Chris Lattner06c0f5b2009-08-23 00:03:44 +00007918 DiagID = diag::ext_typecheck_comparison_of_pointer_integer;
Mike Stump1eb44332009-09-09 15:08:12 +00007919
Chris Lattner06c0f5b2009-08-23 00:03:44 +00007920 if (DiagID) {
Chris Lattner6365e3e2009-08-22 18:58:31 +00007921 Diag(Loc, DiagID)
John Wiegley429bb272011-04-08 18:41:53 +00007922 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007923 if (isError)
7924 return QualType();
Chris Lattner6365e3e2009-08-22 18:58:31 +00007925 }
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007926
7927 if (lType->isIntegerType())
John Wiegley429bb272011-04-08 18:41:53 +00007928 lex = ImpCastExprToType(lex.take(), rType,
John McCall404cd162010-11-13 01:35:44 +00007929 LHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
Chris Lattner06c0f5b2009-08-23 00:03:44 +00007930 else
John Wiegley429bb272011-04-08 18:41:53 +00007931 rex = ImpCastExprToType(rex.take(), lType,
John McCall404cd162010-11-13 01:35:44 +00007932 RHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
Douglas Gregor447b69e2008-11-19 03:25:36 +00007933 return ResultTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00007934 }
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007935
Steve Naroff39218df2008-09-04 16:56:14 +00007936 // Handle block pointers.
Mike Stumpaf199f32009-05-07 18:43:07 +00007937 if (!isRelational && RHSIsNull
7938 && lType->isBlockPointerType() && rType->isIntegerType()) {
John Wiegley429bb272011-04-08 18:41:53 +00007939 rex = ImpCastExprToType(rex.take(), lType, CK_NullToPointer);
Douglas Gregor447b69e2008-11-19 03:25:36 +00007940 return ResultTy;
Steve Naroff39218df2008-09-04 16:56:14 +00007941 }
Mike Stumpaf199f32009-05-07 18:43:07 +00007942 if (!isRelational && LHSIsNull
7943 && lType->isIntegerType() && rType->isBlockPointerType()) {
John Wiegley429bb272011-04-08 18:41:53 +00007944 lex = ImpCastExprToType(lex.take(), rType, CK_NullToPointer);
Douglas Gregor447b69e2008-11-19 03:25:36 +00007945 return ResultTy;
Steve Naroff39218df2008-09-04 16:56:14 +00007946 }
Douglas Gregor90566c02011-03-01 17:16:20 +00007947
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007948 return InvalidOperands(Loc, lex, rex);
Reid Spencer5f016e22007-07-11 17:01:13 +00007949}
7950
Nate Begemanbe2341d2008-07-14 18:02:46 +00007951/// CheckVectorCompareOperands - vector comparisons are a clang extension that
Mike Stumpeed9cac2009-02-19 03:04:26 +00007952/// operates on extended vector types. Instead of producing an IntTy result,
Nate Begemanbe2341d2008-07-14 18:02:46 +00007953/// like a scalar comparison, a vector comparison produces a vector of integer
7954/// types.
John Wiegley429bb272011-04-08 18:41:53 +00007955QualType Sema::CheckVectorCompareOperands(ExprResult &lex, ExprResult &rex,
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007956 SourceLocation Loc,
Nate Begemanbe2341d2008-07-14 18:02:46 +00007957 bool isRelational) {
7958 // Check to make sure we're operating on vectors of the same type and width,
7959 // Allowing one side to be a scalar of element type.
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007960 QualType vType = CheckVectorOperands(Loc, lex, rex);
Nate Begemanbe2341d2008-07-14 18:02:46 +00007961 if (vType.isNull())
7962 return vType;
Mike Stumpeed9cac2009-02-19 03:04:26 +00007963
John Wiegley429bb272011-04-08 18:41:53 +00007964 QualType lType = lex.get()->getType();
7965 QualType rType = rex.get()->getType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007966
Anton Yartsev7870b132011-03-27 15:36:07 +00007967 // If AltiVec, the comparison results in a numeric type, i.e.
7968 // bool for C++, int for C
Anton Yartsev6305f722011-03-28 21:00:05 +00007969 if (vType->getAs<VectorType>()->getVectorKind() == VectorType::AltiVecVector)
Anton Yartsev7870b132011-03-27 15:36:07 +00007970 return Context.getLogicalOperationType();
7971
Nate Begemanbe2341d2008-07-14 18:02:46 +00007972 // For non-floating point types, check for self-comparisons of the form
7973 // x == x, x != x, x < x, etc. These always evaluate to a constant, and
7974 // often indicate logic errors in the program.
Douglas Gregor8eee1192010-06-22 22:12:46 +00007975 if (!lType->hasFloatingRepresentation()) {
John Wiegley429bb272011-04-08 18:41:53 +00007976 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex.get()->IgnoreParens()))
7977 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex.get()->IgnoreParens()))
Nate Begemanbe2341d2008-07-14 18:02:46 +00007978 if (DRL->getDecl() == DRR->getDecl())
Ted Kremenek351ba912011-02-23 01:52:04 +00007979 DiagRuntimeBehavior(Loc, 0,
Douglas Gregord64fdd02010-06-08 19:50:34 +00007980 PDiag(diag::warn_comparison_always)
7981 << 0 // self-
7982 << 2 // "a constant"
7983 );
Nate Begemanbe2341d2008-07-14 18:02:46 +00007984 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007985
Nate Begemanbe2341d2008-07-14 18:02:46 +00007986 // Check for comparisons of floating point operands using != and ==.
Douglas Gregor8eee1192010-06-22 22:12:46 +00007987 if (!isRelational && lType->hasFloatingRepresentation()) {
7988 assert (rType->hasFloatingRepresentation());
John Wiegley429bb272011-04-08 18:41:53 +00007989 CheckFloatComparison(Loc, lex.get(), rex.get());
Nate Begemanbe2341d2008-07-14 18:02:46 +00007990 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007991
Nate Begemanbe2341d2008-07-14 18:02:46 +00007992 // Return the type for the comparison, which is the same as vector type for
7993 // integer vectors, or an integer type of identical size and number of
7994 // elements for floating point vectors.
Douglas Gregorf6094622010-07-23 15:58:24 +00007995 if (lType->hasIntegerRepresentation())
Nate Begemanbe2341d2008-07-14 18:02:46 +00007996 return lType;
Mike Stumpeed9cac2009-02-19 03:04:26 +00007997
John McCall183700f2009-09-21 23:43:11 +00007998 const VectorType *VTy = lType->getAs<VectorType>();
Nate Begemanbe2341d2008-07-14 18:02:46 +00007999 unsigned TypeSize = Context.getTypeSize(VTy->getElementType());
Nate Begeman59b5da62009-01-18 03:20:47 +00008000 if (TypeSize == Context.getTypeSize(Context.IntTy))
Nate Begemanbe2341d2008-07-14 18:02:46 +00008001 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements());
Chris Lattnerd013aa12009-03-31 07:46:52 +00008002 if (TypeSize == Context.getTypeSize(Context.LongTy))
Nate Begeman59b5da62009-01-18 03:20:47 +00008003 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements());
8004
Mike Stumpeed9cac2009-02-19 03:04:26 +00008005 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) &&
Nate Begeman59b5da62009-01-18 03:20:47 +00008006 "Unhandled vector element size in vector compare");
Nate Begemanbe2341d2008-07-14 18:02:46 +00008007 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements());
8008}
8009
Reid Spencer5f016e22007-07-11 17:01:13 +00008010inline QualType Sema::CheckBitwiseOperands(
John Wiegley429bb272011-04-08 18:41:53 +00008011 ExprResult &lex, ExprResult &rex, SourceLocation Loc, bool isCompAssign) {
8012 if (lex.get()->getType()->isVectorType() || rex.get()->getType()->isVectorType()) {
8013 if (lex.get()->getType()->hasIntegerRepresentation() &&
8014 rex.get()->getType()->hasIntegerRepresentation())
Douglas Gregorf6094622010-07-23 15:58:24 +00008015 return CheckVectorOperands(Loc, lex, rex);
8016
8017 return InvalidOperands(Loc, lex, rex);
8018 }
Steve Naroff90045e82007-07-13 23:32:42 +00008019
John Wiegley429bb272011-04-08 18:41:53 +00008020 ExprResult lexResult = Owned(lex), rexResult = Owned(rex);
8021 QualType compType = UsualArithmeticConversions(lexResult, rexResult, isCompAssign);
8022 if (lexResult.isInvalid() || rexResult.isInvalid())
8023 return QualType();
8024 lex = lexResult.take();
8025 rex = rexResult.take();
Mike Stumpeed9cac2009-02-19 03:04:26 +00008026
John Wiegley429bb272011-04-08 18:41:53 +00008027 if (lex.get()->getType()->isIntegralOrUnscopedEnumerationType() &&
8028 rex.get()->getType()->isIntegralOrUnscopedEnumerationType())
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00008029 return compType;
Chris Lattner29a1cfb2008-11-18 01:30:42 +00008030 return InvalidOperands(Loc, lex, rex);
Reid Spencer5f016e22007-07-11 17:01:13 +00008031}
8032
8033inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14]
John Wiegley429bb272011-04-08 18:41:53 +00008034 ExprResult &lex, ExprResult &rex, SourceLocation Loc, unsigned Opc) {
Chris Lattner90a8f272010-07-13 19:41:32 +00008035
8036 // Diagnose cases where the user write a logical and/or but probably meant a
8037 // bitwise one. We do this when the LHS is a non-bool integer and the RHS
8038 // is a constant.
John Wiegley429bb272011-04-08 18:41:53 +00008039 if (lex.get()->getType()->isIntegerType() && !lex.get()->getType()->isBooleanType() &&
8040 rex.get()->getType()->isIntegerType() && !rex.get()->isValueDependent() &&
Chris Lattner23ef3e42010-07-15 00:26:43 +00008041 // Don't warn in macros.
Chris Lattnerb7690b42010-07-24 01:10:11 +00008042 !Loc.isMacroID()) {
8043 // If the RHS can be constant folded, and if it constant folds to something
8044 // that isn't 0 or 1 (which indicate a potential logical operation that
8045 // happened to fold to true/false) then warn.
Chandler Carruth0683a142011-05-31 05:41:42 +00008046 // Parens on the RHS are ignored.
Chris Lattnerb7690b42010-07-24 01:10:11 +00008047 Expr::EvalResult Result;
Chandler Carruth0683a142011-05-31 05:41:42 +00008048 if (rex.get()->Evaluate(Result, Context) && !Result.HasSideEffects)
8049 if ((getLangOptions().Bool && !rex.get()->getType()->isBooleanType()) ||
8050 (Result.Val.getInt() != 0 && Result.Val.getInt() != 1)) {
8051 Diag(Loc, diag::warn_logical_instead_of_bitwise)
8052 << rex.get()->getSourceRange()
8053 << (Opc == BO_LAnd ? "&&" : "||")
8054 << (Opc == BO_LAnd ? "&" : "|");
Chris Lattnerb7690b42010-07-24 01:10:11 +00008055 }
8056 }
Chris Lattner90a8f272010-07-13 19:41:32 +00008057
Anders Carlssona4c98cd2009-11-23 21:47:44 +00008058 if (!Context.getLangOptions().CPlusPlus) {
John Wiegley429bb272011-04-08 18:41:53 +00008059 lex = UsualUnaryConversions(lex.take());
8060 if (lex.isInvalid())
8061 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00008062
John Wiegley429bb272011-04-08 18:41:53 +00008063 rex = UsualUnaryConversions(rex.take());
8064 if (rex.isInvalid())
8065 return QualType();
8066
8067 if (!lex.get()->getType()->isScalarType() || !rex.get()->getType()->isScalarType())
Anders Carlssona4c98cd2009-11-23 21:47:44 +00008068 return InvalidOperands(Loc, lex, rex);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008069
Anders Carlssona4c98cd2009-11-23 21:47:44 +00008070 return Context.IntTy;
Anders Carlsson04905012009-10-16 01:44:21 +00008071 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008072
John McCall75f7c0f2010-06-04 00:29:51 +00008073 // The following is safe because we only use this method for
8074 // non-overloadable operands.
8075
Anders Carlssona4c98cd2009-11-23 21:47:44 +00008076 // C++ [expr.log.and]p1
8077 // C++ [expr.log.or]p1
John McCall75f7c0f2010-06-04 00:29:51 +00008078 // The operands are both contextually converted to type bool.
John Wiegley429bb272011-04-08 18:41:53 +00008079 ExprResult lexRes = PerformContextuallyConvertToBool(lex.get());
8080 if (lexRes.isInvalid())
Anders Carlssona4c98cd2009-11-23 21:47:44 +00008081 return InvalidOperands(Loc, lex, rex);
John Wiegley429bb272011-04-08 18:41:53 +00008082 lex = move(lexRes);
8083
8084 ExprResult rexRes = PerformContextuallyConvertToBool(rex.get());
8085 if (rexRes.isInvalid())
8086 return InvalidOperands(Loc, lex, rex);
8087 rex = move(rexRes);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008088
Anders Carlssona4c98cd2009-11-23 21:47:44 +00008089 // C++ [expr.log.and]p2
8090 // C++ [expr.log.or]p2
8091 // The result is a bool.
8092 return Context.BoolTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00008093}
8094
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00008095/// IsReadonlyProperty - Verify that otherwise a valid l-value expression
8096/// is a read-only property; return true if so. A readonly property expression
8097/// depends on various declarations and thus must be treated specially.
8098///
Mike Stump1eb44332009-09-09 15:08:12 +00008099static bool IsReadonlyProperty(Expr *E, Sema &S) {
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00008100 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) {
8101 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E);
John McCall12f78a62010-12-02 01:19:52 +00008102 if (PropExpr->isImplicitProperty()) return false;
8103
8104 ObjCPropertyDecl *PDecl = PropExpr->getExplicitProperty();
8105 QualType BaseType = PropExpr->isSuperReceiver() ?
8106 PropExpr->getSuperReceiverType() :
Fariborz Jahanian8ac2d442010-10-14 16:04:05 +00008107 PropExpr->getBase()->getType();
8108
John McCall12f78a62010-12-02 01:19:52 +00008109 if (const ObjCObjectPointerType *OPT =
8110 BaseType->getAsObjCInterfacePointerType())
8111 if (ObjCInterfaceDecl *IFace = OPT->getInterfaceDecl())
8112 if (S.isPropertyReadonly(PDecl, IFace))
8113 return true;
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00008114 }
8115 return false;
8116}
8117
Fariborz Jahanian14086762011-03-28 23:47:18 +00008118static bool IsConstProperty(Expr *E, Sema &S) {
8119 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) {
8120 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E);
8121 if (PropExpr->isImplicitProperty()) return false;
8122
8123 ObjCPropertyDecl *PDecl = PropExpr->getExplicitProperty();
8124 QualType T = PDecl->getType();
8125 if (T->isReferenceType())
Fariborz Jahanian61750f22011-03-30 16:59:30 +00008126 T = T->getAs<ReferenceType>()->getPointeeType();
Fariborz Jahanian14086762011-03-28 23:47:18 +00008127 CanQualType CT = S.Context.getCanonicalType(T);
8128 return CT.isConstQualified();
8129 }
8130 return false;
8131}
8132
Fariborz Jahanian077f4902011-03-26 19:48:30 +00008133static bool IsReadonlyMessage(Expr *E, Sema &S) {
8134 if (E->getStmtClass() != Expr::MemberExprClass)
8135 return false;
8136 const MemberExpr *ME = cast<MemberExpr>(E);
8137 NamedDecl *Member = ME->getMemberDecl();
8138 if (isa<FieldDecl>(Member)) {
8139 Expr *Base = ME->getBase()->IgnoreParenImpCasts();
8140 if (Base->getStmtClass() != Expr::ObjCMessageExprClass)
8141 return false;
8142 return cast<ObjCMessageExpr>(Base)->getMethodDecl() != 0;
8143 }
8144 return false;
8145}
8146
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008147/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not,
8148/// emit an error and return true. If so, return false.
8149static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) {
Daniel Dunbar44e35f72009-04-15 00:08:05 +00008150 SourceLocation OrigLoc = Loc;
Mike Stump1eb44332009-09-09 15:08:12 +00008151 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context,
Daniel Dunbar44e35f72009-04-15 00:08:05 +00008152 &Loc);
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00008153 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S))
8154 IsLV = Expr::MLV_ReadonlyProperty;
Fariborz Jahanian14086762011-03-28 23:47:18 +00008155 else if (Expr::MLV_ConstQualified && IsConstProperty(E, S))
8156 IsLV = Expr::MLV_Valid;
Fariborz Jahanian077f4902011-03-26 19:48:30 +00008157 else if (IsLV == Expr::MLV_ClassTemporary && IsReadonlyMessage(E, S))
8158 IsLV = Expr::MLV_InvalidMessageExpression;
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008159 if (IsLV == Expr::MLV_Valid)
8160 return false;
Mike Stumpeed9cac2009-02-19 03:04:26 +00008161
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008162 unsigned Diag = 0;
8163 bool NeedType = false;
8164 switch (IsLV) { // C99 6.5.16p2
John McCallf85e1932011-06-15 23:02:42 +00008165 case Expr::MLV_ConstQualified:
8166 Diag = diag::err_typecheck_assign_const;
8167
John McCall7acddac2011-06-17 06:42:21 +00008168 // In ARC, use some specialized diagnostics for occasions where we
8169 // infer 'const'. These are always pseudo-strong variables.
John McCallf85e1932011-06-15 23:02:42 +00008170 if (S.getLangOptions().ObjCAutoRefCount) {
8171 DeclRefExpr *declRef = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts());
8172 if (declRef && isa<VarDecl>(declRef->getDecl())) {
8173 VarDecl *var = cast<VarDecl>(declRef->getDecl());
8174
John McCall7acddac2011-06-17 06:42:21 +00008175 // Use the normal diagnostic if it's pseudo-__strong but the
8176 // user actually wrote 'const'.
8177 if (var->isARCPseudoStrong() &&
8178 (!var->getTypeSourceInfo() ||
8179 !var->getTypeSourceInfo()->getType().isConstQualified())) {
8180 // There are two pseudo-strong cases:
8181 // - self
John McCallf85e1932011-06-15 23:02:42 +00008182 ObjCMethodDecl *method = S.getCurMethodDecl();
8183 if (method && var == method->getSelfDecl())
8184 Diag = diag::err_typecheck_arr_assign_self;
John McCall7acddac2011-06-17 06:42:21 +00008185
8186 // - fast enumeration variables
8187 else
John McCallf85e1932011-06-15 23:02:42 +00008188 Diag = diag::err_typecheck_arr_assign_enumeration;
John McCall7acddac2011-06-17 06:42:21 +00008189
John McCallf85e1932011-06-15 23:02:42 +00008190 SourceRange Assign;
8191 if (Loc != OrigLoc)
8192 Assign = SourceRange(OrigLoc, OrigLoc);
8193 S.Diag(Loc, Diag) << E->getSourceRange() << Assign;
8194 // We need to preserve the AST regardless, so migration tool
8195 // can do its job.
8196 return false;
8197 }
8198 }
8199 }
8200
8201 break;
Mike Stumpeed9cac2009-02-19 03:04:26 +00008202 case Expr::MLV_ArrayType:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008203 Diag = diag::err_typecheck_array_not_modifiable_lvalue;
8204 NeedType = true;
8205 break;
Mike Stumpeed9cac2009-02-19 03:04:26 +00008206 case Expr::MLV_NotObjectType:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008207 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue;
8208 NeedType = true;
8209 break;
Chris Lattnerca354fa2008-11-17 19:51:54 +00008210 case Expr::MLV_LValueCast:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008211 Diag = diag::err_typecheck_lvalue_casts_not_supported;
8212 break;
Douglas Gregore873fb72010-02-16 21:39:57 +00008213 case Expr::MLV_Valid:
8214 llvm_unreachable("did not take early return for MLV_Valid");
Chris Lattner5cf216b2008-01-04 18:04:52 +00008215 case Expr::MLV_InvalidExpression:
Douglas Gregore873fb72010-02-16 21:39:57 +00008216 case Expr::MLV_MemberFunction:
8217 case Expr::MLV_ClassTemporary:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008218 Diag = diag::err_typecheck_expression_not_modifiable_lvalue;
8219 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00008220 case Expr::MLV_IncompleteType:
8221 case Expr::MLV_IncompleteVoidType:
Douglas Gregor86447ec2009-03-09 16:13:40 +00008222 return S.RequireCompleteType(Loc, E->getType(),
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00008223 S.PDiag(diag::err_typecheck_incomplete_type_not_modifiable_lvalue)
Anders Carlssonb7906612009-08-26 23:45:07 +00008224 << E->getSourceRange());
Chris Lattner5cf216b2008-01-04 18:04:52 +00008225 case Expr::MLV_DuplicateVectorComponents:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008226 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue;
8227 break;
Steve Naroff4f6a7d72008-09-26 14:41:28 +00008228 case Expr::MLV_NotBlockQualified:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008229 Diag = diag::err_block_decl_ref_not_modifiable_lvalue;
8230 break;
Fariborz Jahanian5daf5702008-11-22 18:39:36 +00008231 case Expr::MLV_ReadonlyProperty:
8232 Diag = diag::error_readonly_property_assignment;
8233 break;
Fariborz Jahanianba8d2d62008-11-22 20:25:50 +00008234 case Expr::MLV_NoSetterProperty:
8235 Diag = diag::error_nosetter_property_assignment;
8236 break;
Fariborz Jahanian077f4902011-03-26 19:48:30 +00008237 case Expr::MLV_InvalidMessageExpression:
8238 Diag = diag::error_readonly_message_assignment;
8239 break;
Fariborz Jahanian2514a302009-12-15 23:59:41 +00008240 case Expr::MLV_SubObjCPropertySetting:
8241 Diag = diag::error_no_subobject_property_setting;
8242 break;
Reid Spencer5f016e22007-07-11 17:01:13 +00008243 }
Steve Naroffd1861fd2007-07-31 12:34:36 +00008244
Daniel Dunbar44e35f72009-04-15 00:08:05 +00008245 SourceRange Assign;
8246 if (Loc != OrigLoc)
8247 Assign = SourceRange(OrigLoc, OrigLoc);
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008248 if (NeedType)
Daniel Dunbar44e35f72009-04-15 00:08:05 +00008249 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign;
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008250 else
Mike Stump1eb44332009-09-09 15:08:12 +00008251 S.Diag(Loc, Diag) << E->getSourceRange() << Assign;
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008252 return true;
8253}
8254
8255
8256
8257// C99 6.5.16.1
John Wiegley429bb272011-04-08 18:41:53 +00008258QualType Sema::CheckAssignmentOperands(Expr *LHS, ExprResult &RHS,
Chris Lattner29a1cfb2008-11-18 01:30:42 +00008259 SourceLocation Loc,
8260 QualType CompoundType) {
8261 // Verify that LHS is a modifiable lvalue, and emit error if not.
8262 if (CheckForModifiableLvalue(LHS, Loc, *this))
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008263 return QualType();
Chris Lattner29a1cfb2008-11-18 01:30:42 +00008264
8265 QualType LHSType = LHS->getType();
John Wiegley429bb272011-04-08 18:41:53 +00008266 QualType RHSType = CompoundType.isNull() ? RHS.get()->getType() : CompoundType;
Chris Lattner5cf216b2008-01-04 18:04:52 +00008267 AssignConvertType ConvTy;
Chris Lattner29a1cfb2008-11-18 01:30:42 +00008268 if (CompoundType.isNull()) {
Fariborz Jahaniane2a901a2010-06-07 22:02:01 +00008269 QualType LHSTy(LHSType);
Chris Lattner2c156472008-08-21 18:04:13 +00008270 // Simple assignment "x = y".
John Wiegley429bb272011-04-08 18:41:53 +00008271 if (LHS->getObjectKind() == OK_ObjCProperty) {
8272 ExprResult LHSResult = Owned(LHS);
8273 ConvertPropertyForLValue(LHSResult, RHS, LHSTy);
8274 if (LHSResult.isInvalid())
8275 return QualType();
8276 LHS = LHSResult.take();
8277 }
Fariborz Jahaniane2a901a2010-06-07 22:02:01 +00008278 ConvTy = CheckSingleAssignmentConstraints(LHSTy, RHS);
John Wiegley429bb272011-04-08 18:41:53 +00008279 if (RHS.isInvalid())
8280 return QualType();
Fariborz Jahanianfa23c1d2009-01-13 23:34:40 +00008281 // Special case of NSObject attributes on c-style pointer types.
8282 if (ConvTy == IncompatiblePointer &&
8283 ((Context.isObjCNSObjectType(LHSType) &&
Steve Narofff4954562009-07-16 15:41:00 +00008284 RHSType->isObjCObjectPointerType()) ||
Fariborz Jahanianfa23c1d2009-01-13 23:34:40 +00008285 (Context.isObjCNSObjectType(RHSType) &&
Steve Narofff4954562009-07-16 15:41:00 +00008286 LHSType->isObjCObjectPointerType())))
Fariborz Jahanianfa23c1d2009-01-13 23:34:40 +00008287 ConvTy = Compatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00008288
John McCallf89e55a2010-11-18 06:31:45 +00008289 if (ConvTy == Compatible &&
8290 getLangOptions().ObjCNonFragileABI &&
8291 LHSType->isObjCObjectType())
8292 Diag(Loc, diag::err_assignment_requires_nonfragile_object)
8293 << LHSType;
8294
Chris Lattner2c156472008-08-21 18:04:13 +00008295 // If the RHS is a unary plus or minus, check to see if they = and + are
8296 // right next to each other. If so, the user may have typo'd "x =+ 4"
8297 // instead of "x += 4".
John Wiegley429bb272011-04-08 18:41:53 +00008298 Expr *RHSCheck = RHS.get();
Chris Lattner2c156472008-08-21 18:04:13 +00008299 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck))
8300 RHSCheck = ICE->getSubExpr();
8301 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) {
John McCall2de56d12010-08-25 11:45:40 +00008302 if ((UO->getOpcode() == UO_Plus ||
8303 UO->getOpcode() == UO_Minus) &&
Chris Lattner29a1cfb2008-11-18 01:30:42 +00008304 Loc.isFileID() && UO->getOperatorLoc().isFileID() &&
Chris Lattner2c156472008-08-21 18:04:13 +00008305 // Only if the two operators are exactly adjacent.
Chris Lattner399bd1b2009-03-08 06:51:10 +00008306 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() &&
8307 // And there is a space or other character before the subexpr of the
8308 // unary +/-. We don't want to warn on "x=-1".
Chris Lattner3e872092009-03-09 07:11:10 +00008309 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() &&
8310 UO->getSubExpr()->getLocStart().isFileID()) {
Chris Lattnerd3a94e22008-11-20 06:06:08 +00008311 Diag(Loc, diag::warn_not_compound_assign)
John McCall2de56d12010-08-25 11:45:40 +00008312 << (UO->getOpcode() == UO_Plus ? "+" : "-")
Chris Lattnerd3a94e22008-11-20 06:06:08 +00008313 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc());
Chris Lattner399bd1b2009-03-08 06:51:10 +00008314 }
Chris Lattner2c156472008-08-21 18:04:13 +00008315 }
John McCallf85e1932011-06-15 23:02:42 +00008316
8317 if (ConvTy == Compatible) {
8318 if (LHSType.getObjCLifetime() == Qualifiers::OCL_Strong)
8319 checkRetainCycles(LHS, RHS.get());
8320 else
8321 checkUnsafeAssigns(Loc, LHSType, RHS.get());
8322 }
Chris Lattner2c156472008-08-21 18:04:13 +00008323 } else {
8324 // Compound assignment "x += y"
Douglas Gregorb608b982011-01-28 02:26:04 +00008325 ConvTy = CheckAssignmentConstraints(Loc, LHSType, RHSType);
Chris Lattner2c156472008-08-21 18:04:13 +00008326 }
Chris Lattner5cf216b2008-01-04 18:04:52 +00008327
Chris Lattner29a1cfb2008-11-18 01:30:42 +00008328 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType,
John Wiegley429bb272011-04-08 18:41:53 +00008329 RHS.get(), AA_Assigning))
Chris Lattner5cf216b2008-01-04 18:04:52 +00008330 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00008331
Argyrios Kyrtzidis8a285ae2011-04-26 17:41:22 +00008332 CheckForNullPointerDereference(*this, LHS);
Ted Kremeneka0125d82011-02-16 01:57:07 +00008333 // Check for trivial buffer overflows.
Ted Kremenek3aea4da2011-03-01 18:41:00 +00008334 CheckArrayAccess(LHS->IgnoreParenCasts());
Ted Kremeneka0125d82011-02-16 01:57:07 +00008335
Reid Spencer5f016e22007-07-11 17:01:13 +00008336 // C99 6.5.16p3: The type of an assignment expression is the type of the
8337 // left operand unless the left operand has qualified type, in which case
Mike Stumpeed9cac2009-02-19 03:04:26 +00008338 // it is the unqualified version of the type of the left operand.
Reid Spencer5f016e22007-07-11 17:01:13 +00008339 // C99 6.5.16.1p2: In simple assignment, the value of the right operand
8340 // is converted to the type of the assignment expression (above).
Chris Lattner73d0d4f2007-08-30 17:45:32 +00008341 // C++ 5.17p1: the type of the assignment expression is that of its left
Douglas Gregor2d833e32009-05-02 00:36:19 +00008342 // operand.
John McCall2bf6f492010-10-12 02:19:57 +00008343 return (getLangOptions().CPlusPlus
8344 ? LHSType : LHSType.getUnqualifiedType());
Reid Spencer5f016e22007-07-11 17:01:13 +00008345}
8346
Chris Lattner29a1cfb2008-11-18 01:30:42 +00008347// C99 6.5.17
John Wiegley429bb272011-04-08 18:41:53 +00008348static QualType CheckCommaOperands(Sema &S, ExprResult &LHS, ExprResult &RHS,
John McCall09431682010-11-18 19:01:18 +00008349 SourceLocation Loc) {
John Wiegley429bb272011-04-08 18:41:53 +00008350 S.DiagnoseUnusedExprResult(LHS.get());
Argyrios Kyrtzidis25973452010-06-30 10:53:14 +00008351
John McCallfb8721c2011-04-10 19:13:55 +00008352 LHS = S.CheckPlaceholderExpr(LHS.take());
8353 RHS = S.CheckPlaceholderExpr(RHS.take());
John Wiegley429bb272011-04-08 18:41:53 +00008354 if (LHS.isInvalid() || RHS.isInvalid())
Douglas Gregor7ad5d422010-11-09 21:07:58 +00008355 return QualType();
8356
John McCallcf2e5062010-10-12 07:14:40 +00008357 // C's comma performs lvalue conversion (C99 6.3.2.1) on both its
8358 // operands, but not unary promotions.
8359 // C++'s comma does not do any conversions at all (C++ [expr.comma]p1).
Eli Friedmanb1d796d2009-03-23 00:24:07 +00008360
John McCallf6a16482010-12-04 03:47:34 +00008361 // So we treat the LHS as a ignored value, and in C++ we allow the
8362 // containing site to determine what should be done with the RHS.
John Wiegley429bb272011-04-08 18:41:53 +00008363 LHS = S.IgnoredValueConversions(LHS.take());
8364 if (LHS.isInvalid())
8365 return QualType();
John McCallf6a16482010-12-04 03:47:34 +00008366
8367 if (!S.getLangOptions().CPlusPlus) {
John Wiegley429bb272011-04-08 18:41:53 +00008368 RHS = S.DefaultFunctionArrayLvalueConversion(RHS.take());
8369 if (RHS.isInvalid())
8370 return QualType();
8371 if (!RHS.get()->getType()->isVoidType())
8372 S.RequireCompleteType(Loc, RHS.get()->getType(), diag::err_incomplete_type);
John McCallcf2e5062010-10-12 07:14:40 +00008373 }
Eli Friedmanb1d796d2009-03-23 00:24:07 +00008374
John Wiegley429bb272011-04-08 18:41:53 +00008375 return RHS.get()->getType();
Reid Spencer5f016e22007-07-11 17:01:13 +00008376}
8377
Steve Naroff49b45262007-07-13 16:58:59 +00008378/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine
8379/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions.
John McCall09431682010-11-18 19:01:18 +00008380static QualType CheckIncrementDecrementOperand(Sema &S, Expr *Op,
8381 ExprValueKind &VK,
8382 SourceLocation OpLoc,
8383 bool isInc, bool isPrefix) {
Sebastian Redl28507842009-02-26 14:39:58 +00008384 if (Op->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00008385 return S.Context.DependentTy;
Sebastian Redl28507842009-02-26 14:39:58 +00008386
Chris Lattner3528d352008-11-21 07:05:48 +00008387 QualType ResType = Op->getType();
8388 assert(!ResType.isNull() && "no type for increment/decrement expression");
Reid Spencer5f016e22007-07-11 17:01:13 +00008389
John McCall09431682010-11-18 19:01:18 +00008390 if (S.getLangOptions().CPlusPlus && ResType->isBooleanType()) {
Sebastian Redle6d5a4a2008-12-20 09:35:34 +00008391 // Decrement of bool is not allowed.
8392 if (!isInc) {
John McCall09431682010-11-18 19:01:18 +00008393 S.Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange();
Sebastian Redle6d5a4a2008-12-20 09:35:34 +00008394 return QualType();
8395 }
8396 // Increment of bool sets it to true, but is deprecated.
John McCall09431682010-11-18 19:01:18 +00008397 S.Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange();
Sebastian Redle6d5a4a2008-12-20 09:35:34 +00008398 } else if (ResType->isRealType()) {
Chris Lattner3528d352008-11-21 07:05:48 +00008399 // OK!
Steve Naroff58f9f2c2009-07-14 18:25:06 +00008400 } else if (ResType->isAnyPointerType()) {
8401 QualType PointeeTy = ResType->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00008402
Chris Lattner3528d352008-11-21 07:05:48 +00008403 // C99 6.5.2.4p2, 6.5.6p2
Steve Naroff14108da2009-07-10 23:34:53 +00008404 if (PointeeTy->isVoidType()) {
John McCall09431682010-11-18 19:01:18 +00008405 if (S.getLangOptions().CPlusPlus) {
8406 S.Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type)
Douglas Gregorc983b862009-01-23 00:36:41 +00008407 << Op->getSourceRange();
8408 return QualType();
8409 }
8410
8411 // Pointer to void is a GNU extension in C.
John McCall09431682010-11-18 19:01:18 +00008412 S.Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange();
Steve Naroff14108da2009-07-10 23:34:53 +00008413 } else if (PointeeTy->isFunctionType()) {
John McCall09431682010-11-18 19:01:18 +00008414 if (S.getLangOptions().CPlusPlus) {
8415 S.Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type)
Douglas Gregorc983b862009-01-23 00:36:41 +00008416 << Op->getType() << Op->getSourceRange();
8417 return QualType();
8418 }
8419
John McCall09431682010-11-18 19:01:18 +00008420 S.Diag(OpLoc, diag::ext_gnu_ptr_func_arith)
Chris Lattnerd1625842008-11-24 06:25:27 +00008421 << ResType << Op->getSourceRange();
John McCall09431682010-11-18 19:01:18 +00008422 } else if (S.RequireCompleteType(OpLoc, PointeeTy,
8423 S.PDiag(diag::err_typecheck_arithmetic_incomplete_type)
Mike Stump1eb44332009-09-09 15:08:12 +00008424 << Op->getSourceRange()
Anders Carlssond497ba72009-08-26 22:59:12 +00008425 << ResType))
Douglas Gregor4ec339f2009-01-19 19:26:10 +00008426 return QualType();
Fariborz Jahanian9f8a04f2009-07-16 17:59:14 +00008427 // Diagnose bad cases where we step over interface counts.
John McCall09431682010-11-18 19:01:18 +00008428 else if (PointeeTy->isObjCObjectType() && S.LangOpts.ObjCNonFragileABI) {
8429 S.Diag(OpLoc, diag::err_arithmetic_nonfragile_interface)
Fariborz Jahanian9f8a04f2009-07-16 17:59:14 +00008430 << PointeeTy << Op->getSourceRange();
8431 return QualType();
8432 }
Eli Friedman5b088a12010-01-03 00:20:48 +00008433 } else if (ResType->isAnyComplexType()) {
Chris Lattner3528d352008-11-21 07:05:48 +00008434 // C99 does not support ++/-- on complex types, we allow as an extension.
John McCall09431682010-11-18 19:01:18 +00008435 S.Diag(OpLoc, diag::ext_integer_increment_complex)
Chris Lattnerd1625842008-11-24 06:25:27 +00008436 << ResType << Op->getSourceRange();
John McCall2cd11fe2010-10-12 02:09:17 +00008437 } else if (ResType->isPlaceholderType()) {
John McCallfb8721c2011-04-10 19:13:55 +00008438 ExprResult PR = S.CheckPlaceholderExpr(Op);
John McCall2cd11fe2010-10-12 02:09:17 +00008439 if (PR.isInvalid()) return QualType();
John McCall09431682010-11-18 19:01:18 +00008440 return CheckIncrementDecrementOperand(S, PR.take(), VK, OpLoc,
8441 isInc, isPrefix);
Anton Yartsev683564a2011-02-07 02:17:30 +00008442 } else if (S.getLangOptions().AltiVec && ResType->isVectorType()) {
8443 // OK! ( C/C++ Language Extensions for CBEA(Version 2.6) 10.3 )
Chris Lattner3528d352008-11-21 07:05:48 +00008444 } else {
John McCall09431682010-11-18 19:01:18 +00008445 S.Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement)
Douglas Gregor5cc07df2009-12-15 16:44:32 +00008446 << ResType << int(isInc) << Op->getSourceRange();
Chris Lattner3528d352008-11-21 07:05:48 +00008447 return QualType();
Reid Spencer5f016e22007-07-11 17:01:13 +00008448 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008449 // At this point, we know we have a real, complex or pointer type.
Steve Naroffdd10e022007-08-23 21:37:33 +00008450 // Now make sure the operand is a modifiable lvalue.
John McCall09431682010-11-18 19:01:18 +00008451 if (CheckForModifiableLvalue(Op, OpLoc, S))
Reid Spencer5f016e22007-07-11 17:01:13 +00008452 return QualType();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00008453 // In C++, a prefix increment is the same type as the operand. Otherwise
8454 // (in C or with postfix), the increment is the unqualified type of the
8455 // operand.
John McCall09431682010-11-18 19:01:18 +00008456 if (isPrefix && S.getLangOptions().CPlusPlus) {
8457 VK = VK_LValue;
8458 return ResType;
8459 } else {
8460 VK = VK_RValue;
8461 return ResType.getUnqualifiedType();
8462 }
Reid Spencer5f016e22007-07-11 17:01:13 +00008463}
8464
John Wiegley429bb272011-04-08 18:41:53 +00008465ExprResult Sema::ConvertPropertyForRValue(Expr *E) {
John McCallf6a16482010-12-04 03:47:34 +00008466 assert(E->getValueKind() == VK_LValue &&
8467 E->getObjectKind() == OK_ObjCProperty);
8468 const ObjCPropertyRefExpr *PRE = E->getObjCProperty();
8469
Douglas Gregor926df6c2011-06-11 01:09:30 +00008470 QualType T = E->getType();
8471 QualType ReceiverType;
8472 if (PRE->isObjectReceiver())
8473 ReceiverType = PRE->getBase()->getType();
8474 else if (PRE->isSuperReceiver())
8475 ReceiverType = PRE->getSuperReceiverType();
8476 else
8477 ReceiverType = Context.getObjCInterfaceType(PRE->getClassReceiver());
8478
John McCallf6a16482010-12-04 03:47:34 +00008479 ExprValueKind VK = VK_RValue;
8480 if (PRE->isImplicitProperty()) {
Douglas Gregor926df6c2011-06-11 01:09:30 +00008481 if (ObjCMethodDecl *GetterMethod =
Fariborz Jahanian99130e52010-12-22 19:46:35 +00008482 PRE->getImplicitPropertyGetter()) {
Douglas Gregor926df6c2011-06-11 01:09:30 +00008483 T = getMessageSendResultType(ReceiverType, GetterMethod,
8484 PRE->isClassReceiver(),
8485 PRE->isSuperReceiver());
8486 VK = Expr::getValueKindForType(GetterMethod->getResultType());
Fariborz Jahanian99130e52010-12-22 19:46:35 +00008487 }
8488 else {
8489 Diag(PRE->getLocation(), diag::err_getter_not_found)
8490 << PRE->getBase()->getType();
8491 }
John McCallf6a16482010-12-04 03:47:34 +00008492 }
Douglas Gregor926df6c2011-06-11 01:09:30 +00008493
8494 E = ImplicitCastExpr::Create(Context, T, CK_GetObjCProperty,
John McCallf6a16482010-12-04 03:47:34 +00008495 E, 0, VK);
John McCalldb67e2f2010-12-10 01:49:45 +00008496
8497 ExprResult Result = MaybeBindToTemporary(E);
8498 if (!Result.isInvalid())
8499 E = Result.take();
John Wiegley429bb272011-04-08 18:41:53 +00008500
8501 return Owned(E);
John McCallf6a16482010-12-04 03:47:34 +00008502}
8503
John Wiegley429bb272011-04-08 18:41:53 +00008504void Sema::ConvertPropertyForLValue(ExprResult &LHS, ExprResult &RHS, QualType &LHSTy) {
8505 assert(LHS.get()->getValueKind() == VK_LValue &&
8506 LHS.get()->getObjectKind() == OK_ObjCProperty);
8507 const ObjCPropertyRefExpr *PropRef = LHS.get()->getObjCProperty();
John McCallf6a16482010-12-04 03:47:34 +00008508
John McCallf85e1932011-06-15 23:02:42 +00008509 bool Consumed = false;
8510
John Wiegley429bb272011-04-08 18:41:53 +00008511 if (PropRef->isImplicitProperty()) {
John McCallf6a16482010-12-04 03:47:34 +00008512 // If using property-dot syntax notation for assignment, and there is a
8513 // setter, RHS expression is being passed to the setter argument. So,
8514 // type conversion (and comparison) is RHS to setter's argument type.
John Wiegley429bb272011-04-08 18:41:53 +00008515 if (const ObjCMethodDecl *SetterMD = PropRef->getImplicitPropertySetter()) {
John McCallf6a16482010-12-04 03:47:34 +00008516 ObjCMethodDecl::param_iterator P = SetterMD->param_begin();
8517 LHSTy = (*P)->getType();
John McCallf85e1932011-06-15 23:02:42 +00008518 Consumed = (getLangOptions().ObjCAutoRefCount &&
8519 (*P)->hasAttr<NSConsumedAttr>());
John McCallf6a16482010-12-04 03:47:34 +00008520
8521 // Otherwise, if the getter returns an l-value, just call that.
8522 } else {
John Wiegley429bb272011-04-08 18:41:53 +00008523 QualType Result = PropRef->getImplicitPropertyGetter()->getResultType();
John McCallf6a16482010-12-04 03:47:34 +00008524 ExprValueKind VK = Expr::getValueKindForType(Result);
8525 if (VK == VK_LValue) {
John Wiegley429bb272011-04-08 18:41:53 +00008526 LHS = ImplicitCastExpr::Create(Context, LHS.get()->getType(),
8527 CK_GetObjCProperty, LHS.take(), 0, VK);
John McCallf6a16482010-12-04 03:47:34 +00008528 return;
John McCall12f78a62010-12-02 01:19:52 +00008529 }
Fariborz Jahanianc4e1a682010-09-14 23:02:38 +00008530 }
John McCallf85e1932011-06-15 23:02:42 +00008531 } else if (getLangOptions().ObjCAutoRefCount) {
8532 const ObjCMethodDecl *setter
8533 = PropRef->getExplicitProperty()->getSetterMethodDecl();
8534 if (setter) {
8535 ObjCMethodDecl::param_iterator P = setter->param_begin();
8536 LHSTy = (*P)->getType();
8537 Consumed = (*P)->hasAttr<NSConsumedAttr>();
8538 }
John McCallf6a16482010-12-04 03:47:34 +00008539 }
8540
John McCallf85e1932011-06-15 23:02:42 +00008541 if ((getLangOptions().CPlusPlus && LHSTy->isRecordType()) ||
8542 getLangOptions().ObjCAutoRefCount) {
Fariborz Jahanianc4e1a682010-09-14 23:02:38 +00008543 InitializedEntity Entity =
John McCallf85e1932011-06-15 23:02:42 +00008544 InitializedEntity::InitializeParameter(Context, LHSTy, Consumed);
John Wiegley429bb272011-04-08 18:41:53 +00008545 ExprResult ArgE = PerformCopyInitialization(Entity, SourceLocation(), RHS);
John McCallf85e1932011-06-15 23:02:42 +00008546 if (!ArgE.isInvalid()) {
John Wiegley429bb272011-04-08 18:41:53 +00008547 RHS = ArgE;
John McCallf85e1932011-06-15 23:02:42 +00008548 if (getLangOptions().ObjCAutoRefCount && !PropRef->isSuperReceiver())
8549 checkRetainCycles(const_cast<Expr*>(PropRef->getBase()), RHS.get());
8550 }
Fariborz Jahanianc4e1a682010-09-14 23:02:38 +00008551 }
8552}
8553
8554
Anders Carlsson369dee42008-02-01 07:15:58 +00008555/// getPrimaryDecl - Helper function for CheckAddressOfOperand().
Reid Spencer5f016e22007-07-11 17:01:13 +00008556/// This routine allows us to typecheck complex/recursive expressions
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00008557/// where the declaration is needed for type checking. We only need to
8558/// handle cases when the expression references a function designator
8559/// or is an lvalue. Here are some examples:
8560/// - &(x) => x
8561/// - &*****f => f for f a function designator.
8562/// - &s.xx => s
8563/// - &s.zz[1].yy -> s, if zz is an array
8564/// - *(x + 1) -> x, if x is an array
8565/// - &"123"[2] -> 0
8566/// - & __real__ x -> x
John McCall5808ce42011-02-03 08:15:49 +00008567static ValueDecl *getPrimaryDecl(Expr *E) {
Chris Lattnerf0467b32008-04-02 04:24:33 +00008568 switch (E->getStmtClass()) {
Reid Spencer5f016e22007-07-11 17:01:13 +00008569 case Stmt::DeclRefExprClass:
Chris Lattnerf0467b32008-04-02 04:24:33 +00008570 return cast<DeclRefExpr>(E)->getDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +00008571 case Stmt::MemberExprClass:
Eli Friedman23d58ce2009-04-20 08:23:18 +00008572 // If this is an arrow operator, the address is an offset from
8573 // the base's value, so the object the base refers to is
8574 // irrelevant.
Chris Lattnerf0467b32008-04-02 04:24:33 +00008575 if (cast<MemberExpr>(E)->isArrow())
Chris Lattnerf82228f2007-11-16 17:46:48 +00008576 return 0;
Eli Friedman23d58ce2009-04-20 08:23:18 +00008577 // Otherwise, the expression refers to a part of the base
Chris Lattnerf0467b32008-04-02 04:24:33 +00008578 return getPrimaryDecl(cast<MemberExpr>(E)->getBase());
Anders Carlsson369dee42008-02-01 07:15:58 +00008579 case Stmt::ArraySubscriptExprClass: {
Mike Stump390b4cc2009-05-16 07:39:55 +00008580 // FIXME: This code shouldn't be necessary! We should catch the implicit
8581 // promotion of register arrays earlier.
Eli Friedman23d58ce2009-04-20 08:23:18 +00008582 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase();
8583 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) {
8584 if (ICE->getSubExpr()->getType()->isArrayType())
8585 return getPrimaryDecl(ICE->getSubExpr());
8586 }
8587 return 0;
Anders Carlsson369dee42008-02-01 07:15:58 +00008588 }
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00008589 case Stmt::UnaryOperatorClass: {
8590 UnaryOperator *UO = cast<UnaryOperator>(E);
Mike Stumpeed9cac2009-02-19 03:04:26 +00008591
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00008592 switch(UO->getOpcode()) {
John McCall2de56d12010-08-25 11:45:40 +00008593 case UO_Real:
8594 case UO_Imag:
8595 case UO_Extension:
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00008596 return getPrimaryDecl(UO->getSubExpr());
8597 default:
8598 return 0;
8599 }
8600 }
Reid Spencer5f016e22007-07-11 17:01:13 +00008601 case Stmt::ParenExprClass:
Chris Lattnerf0467b32008-04-02 04:24:33 +00008602 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr());
Chris Lattnerf82228f2007-11-16 17:46:48 +00008603 case Stmt::ImplicitCastExprClass:
Eli Friedman23d58ce2009-04-20 08:23:18 +00008604 // If the result of an implicit cast is an l-value, we care about
8605 // the sub-expression; otherwise, the result here doesn't matter.
Chris Lattnerf0467b32008-04-02 04:24:33 +00008606 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr());
Reid Spencer5f016e22007-07-11 17:01:13 +00008607 default:
8608 return 0;
8609 }
8610}
8611
8612/// CheckAddressOfOperand - The operand of & must be either a function
Mike Stumpeed9cac2009-02-19 03:04:26 +00008613/// designator or an lvalue designating an object. If it is an lvalue, the
Reid Spencer5f016e22007-07-11 17:01:13 +00008614/// object cannot be declared with storage class register or be a bit field.
Mike Stumpeed9cac2009-02-19 03:04:26 +00008615/// Note: The usual conversions are *not* applied to the operand of the &
Reid Spencer5f016e22007-07-11 17:01:13 +00008616/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue.
Mike Stumpeed9cac2009-02-19 03:04:26 +00008617/// In C++, the operand might be an overloaded function name, in which case
Douglas Gregor904eed32008-11-10 20:40:00 +00008618/// we allow the '&' but retain the overloaded-function type.
John McCall09431682010-11-18 19:01:18 +00008619static QualType CheckAddressOfOperand(Sema &S, Expr *OrigOp,
8620 SourceLocation OpLoc) {
John McCall9c72c602010-08-27 09:08:28 +00008621 if (OrigOp->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00008622 return S.Context.DependentTy;
8623 if (OrigOp->getType() == S.Context.OverloadTy)
8624 return S.Context.OverloadTy;
John McCall755d8492011-04-12 00:42:48 +00008625 if (OrigOp->getType() == S.Context.UnknownAnyTy)
8626 return S.Context.UnknownAnyTy;
John McCall864c0412011-04-26 20:42:42 +00008627 if (OrigOp->getType() == S.Context.BoundMemberTy) {
8628 S.Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
8629 << OrigOp->getSourceRange();
8630 return QualType();
8631 }
John McCall9c72c602010-08-27 09:08:28 +00008632
John McCall755d8492011-04-12 00:42:48 +00008633 assert(!OrigOp->getType()->isPlaceholderType());
John McCall2cd11fe2010-10-12 02:09:17 +00008634
John McCall9c72c602010-08-27 09:08:28 +00008635 // Make sure to ignore parentheses in subsequent checks
8636 Expr *op = OrigOp->IgnoreParens();
Douglas Gregor9103bb22008-12-17 22:52:20 +00008637
John McCall09431682010-11-18 19:01:18 +00008638 if (S.getLangOptions().C99) {
Steve Naroff08f19672008-01-13 17:10:08 +00008639 // Implement C99-only parts of addressof rules.
8640 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) {
John McCall2de56d12010-08-25 11:45:40 +00008641 if (uOp->getOpcode() == UO_Deref)
Steve Naroff08f19672008-01-13 17:10:08 +00008642 // Per C99 6.5.3.2, the address of a deref always returns a valid result
8643 // (assuming the deref expression is valid).
8644 return uOp->getSubExpr()->getType();
8645 }
8646 // Technically, there should be a check for array subscript
8647 // expressions here, but the result of one is always an lvalue anyway.
8648 }
John McCall5808ce42011-02-03 08:15:49 +00008649 ValueDecl *dcl = getPrimaryDecl(op);
John McCall7eb0a9e2010-11-24 05:12:34 +00008650 Expr::LValueClassification lval = op->ClassifyLValue(S.Context);
Nuno Lopes6b6609f2008-12-16 22:59:47 +00008651
Fariborz Jahanian077f4902011-03-26 19:48:30 +00008652 if (lval == Expr::LV_ClassTemporary) {
John McCall09431682010-11-18 19:01:18 +00008653 bool sfinae = S.isSFINAEContext();
8654 S.Diag(OpLoc, sfinae ? diag::err_typecheck_addrof_class_temporary
8655 : diag::ext_typecheck_addrof_class_temporary)
Douglas Gregore873fb72010-02-16 21:39:57 +00008656 << op->getType() << op->getSourceRange();
John McCall09431682010-11-18 19:01:18 +00008657 if (sfinae)
Douglas Gregore873fb72010-02-16 21:39:57 +00008658 return QualType();
John McCall9c72c602010-08-27 09:08:28 +00008659 } else if (isa<ObjCSelectorExpr>(op)) {
John McCall09431682010-11-18 19:01:18 +00008660 return S.Context.getPointerType(op->getType());
John McCall9c72c602010-08-27 09:08:28 +00008661 } else if (lval == Expr::LV_MemberFunction) {
8662 // If it's an instance method, make a member pointer.
8663 // The expression must have exactly the form &A::foo.
8664
8665 // If the underlying expression isn't a decl ref, give up.
8666 if (!isa<DeclRefExpr>(op)) {
John McCall09431682010-11-18 19:01:18 +00008667 S.Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
John McCall9c72c602010-08-27 09:08:28 +00008668 << OrigOp->getSourceRange();
8669 return QualType();
8670 }
8671 DeclRefExpr *DRE = cast<DeclRefExpr>(op);
8672 CXXMethodDecl *MD = cast<CXXMethodDecl>(DRE->getDecl());
8673
8674 // The id-expression was parenthesized.
8675 if (OrigOp != DRE) {
John McCall09431682010-11-18 19:01:18 +00008676 S.Diag(OpLoc, diag::err_parens_pointer_member_function)
John McCall9c72c602010-08-27 09:08:28 +00008677 << OrigOp->getSourceRange();
8678
8679 // The method was named without a qualifier.
8680 } else if (!DRE->getQualifier()) {
John McCall09431682010-11-18 19:01:18 +00008681 S.Diag(OpLoc, diag::err_unqualified_pointer_member_function)
John McCall9c72c602010-08-27 09:08:28 +00008682 << op->getSourceRange();
8683 }
8684
John McCall09431682010-11-18 19:01:18 +00008685 return S.Context.getMemberPointerType(op->getType(),
8686 S.Context.getTypeDeclType(MD->getParent()).getTypePtr());
John McCall9c72c602010-08-27 09:08:28 +00008687 } else if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) {
Eli Friedman441cf102009-05-16 23:27:50 +00008688 // C99 6.5.3.2p1
Eli Friedman23d58ce2009-04-20 08:23:18 +00008689 // The operand must be either an l-value or a function designator
Eli Friedman441cf102009-05-16 23:27:50 +00008690 if (!op->getType()->isFunctionType()) {
Chris Lattnerf82228f2007-11-16 17:46:48 +00008691 // FIXME: emit more specific diag...
John McCall09431682010-11-18 19:01:18 +00008692 S.Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof)
Chris Lattnerdcd5ef12008-11-19 05:27:50 +00008693 << op->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00008694 return QualType();
8695 }
John McCall7eb0a9e2010-11-24 05:12:34 +00008696 } else if (op->getObjectKind() == OK_BitField) { // C99 6.5.3.2p1
Eli Friedman23d58ce2009-04-20 08:23:18 +00008697 // The operand cannot be a bit-field
John McCall09431682010-11-18 19:01:18 +00008698 S.Diag(OpLoc, diag::err_typecheck_address_of)
Eli Friedman23d58ce2009-04-20 08:23:18 +00008699 << "bit-field" << op->getSourceRange();
Douglas Gregor86f19402008-12-20 23:49:58 +00008700 return QualType();
John McCall7eb0a9e2010-11-24 05:12:34 +00008701 } else if (op->getObjectKind() == OK_VectorComponent) {
Eli Friedman23d58ce2009-04-20 08:23:18 +00008702 // The operand cannot be an element of a vector
John McCall09431682010-11-18 19:01:18 +00008703 S.Diag(OpLoc, diag::err_typecheck_address_of)
Nate Begemanb104b1f2009-02-15 22:45:20 +00008704 << "vector element" << op->getSourceRange();
Steve Naroffbcb2b612008-02-29 23:30:25 +00008705 return QualType();
John McCall7eb0a9e2010-11-24 05:12:34 +00008706 } else if (op->getObjectKind() == OK_ObjCProperty) {
Fariborz Jahanian0337f212009-07-07 18:50:52 +00008707 // cannot take address of a property expression.
John McCall09431682010-11-18 19:01:18 +00008708 S.Diag(OpLoc, diag::err_typecheck_address_of)
Fariborz Jahanian0337f212009-07-07 18:50:52 +00008709 << "property expression" << op->getSourceRange();
8710 return QualType();
Steve Naroffbcb2b612008-02-29 23:30:25 +00008711 } else if (dcl) { // C99 6.5.3.2p1
Mike Stumpeed9cac2009-02-19 03:04:26 +00008712 // We have an lvalue with a decl. Make sure the decl is not declared
Reid Spencer5f016e22007-07-11 17:01:13 +00008713 // with the register storage-class specifier.
8714 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) {
Fariborz Jahanian4020f872010-08-24 22:21:48 +00008715 // in C++ it is not error to take address of a register
8716 // variable (c++03 7.1.1P3)
John McCalld931b082010-08-26 03:08:43 +00008717 if (vd->getStorageClass() == SC_Register &&
John McCall09431682010-11-18 19:01:18 +00008718 !S.getLangOptions().CPlusPlus) {
8719 S.Diag(OpLoc, diag::err_typecheck_address_of)
Chris Lattnerd3a94e22008-11-20 06:06:08 +00008720 << "register variable" << op->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00008721 return QualType();
8722 }
John McCallba135432009-11-21 08:51:07 +00008723 } else if (isa<FunctionTemplateDecl>(dcl)) {
John McCall09431682010-11-18 19:01:18 +00008724 return S.Context.OverloadTy;
John McCall5808ce42011-02-03 08:15:49 +00008725 } else if (isa<FieldDecl>(dcl) || isa<IndirectFieldDecl>(dcl)) {
Douglas Gregor29882052008-12-10 21:26:49 +00008726 // Okay: we can take the address of a field.
Sebastian Redlebc07d52009-02-03 20:19:35 +00008727 // Could be a pointer to member, though, if there is an explicit
8728 // scope qualifier for the class.
Douglas Gregora2813ce2009-10-23 18:54:35 +00008729 if (isa<DeclRefExpr>(op) && cast<DeclRefExpr>(op)->getQualifier()) {
Sebastian Redlebc07d52009-02-03 20:19:35 +00008730 DeclContext *Ctx = dcl->getDeclContext();
Anders Carlssonf9e48bd2009-07-08 21:45:58 +00008731 if (Ctx && Ctx->isRecord()) {
John McCall5808ce42011-02-03 08:15:49 +00008732 if (dcl->getType()->isReferenceType()) {
John McCall09431682010-11-18 19:01:18 +00008733 S.Diag(OpLoc,
8734 diag::err_cannot_form_pointer_to_member_of_reference_type)
John McCall5808ce42011-02-03 08:15:49 +00008735 << dcl->getDeclName() << dcl->getType();
Anders Carlssonf9e48bd2009-07-08 21:45:58 +00008736 return QualType();
8737 }
Mike Stump1eb44332009-09-09 15:08:12 +00008738
Argyrios Kyrtzidis0413db42011-01-31 07:04:29 +00008739 while (cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion())
8740 Ctx = Ctx->getParent();
John McCall09431682010-11-18 19:01:18 +00008741 return S.Context.getMemberPointerType(op->getType(),
8742 S.Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr());
Anders Carlssonf9e48bd2009-07-08 21:45:58 +00008743 }
Sebastian Redlebc07d52009-02-03 20:19:35 +00008744 }
Anders Carlsson196f7d02009-05-16 21:43:42 +00008745 } else if (!isa<FunctionDecl>(dcl))
Reid Spencer5f016e22007-07-11 17:01:13 +00008746 assert(0 && "Unknown/unexpected decl type");
Reid Spencer5f016e22007-07-11 17:01:13 +00008747 }
Sebastian Redl33b399a2009-02-04 21:23:32 +00008748
Eli Friedman441cf102009-05-16 23:27:50 +00008749 if (lval == Expr::LV_IncompleteVoidType) {
8750 // Taking the address of a void variable is technically illegal, but we
8751 // allow it in cases which are otherwise valid.
8752 // Example: "extern void x; void* y = &x;".
John McCall09431682010-11-18 19:01:18 +00008753 S.Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange();
Eli Friedman441cf102009-05-16 23:27:50 +00008754 }
8755
Reid Spencer5f016e22007-07-11 17:01:13 +00008756 // If the operand has type "type", the result has type "pointer to type".
Douglas Gregor8f70ddb2010-07-29 16:05:45 +00008757 if (op->getType()->isObjCObjectType())
John McCall09431682010-11-18 19:01:18 +00008758 return S.Context.getObjCObjectPointerType(op->getType());
8759 return S.Context.getPointerType(op->getType());
Reid Spencer5f016e22007-07-11 17:01:13 +00008760}
8761
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00008762/// CheckIndirectionOperand - Type check unary indirection (prefix '*').
John McCall09431682010-11-18 19:01:18 +00008763static QualType CheckIndirectionOperand(Sema &S, Expr *Op, ExprValueKind &VK,
8764 SourceLocation OpLoc) {
Sebastian Redl28507842009-02-26 14:39:58 +00008765 if (Op->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00008766 return S.Context.DependentTy;
Sebastian Redl28507842009-02-26 14:39:58 +00008767
John Wiegley429bb272011-04-08 18:41:53 +00008768 ExprResult ConvResult = S.UsualUnaryConversions(Op);
8769 if (ConvResult.isInvalid())
8770 return QualType();
8771 Op = ConvResult.take();
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00008772 QualType OpTy = Op->getType();
8773 QualType Result;
Argyrios Kyrtzidisf4bbbf02011-05-02 18:21:19 +00008774
8775 if (isa<CXXReinterpretCastExpr>(Op)) {
8776 QualType OpOrigType = Op->IgnoreParenCasts()->getType();
8777 S.CheckCompatibleReinterpretCast(OpOrigType, OpTy, /*IsDereference*/true,
8778 Op->getSourceRange());
8779 }
8780
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00008781 // Note that per both C89 and C99, indirection is always legal, even if OpTy
8782 // is an incomplete type or void. It would be possible to warn about
8783 // dereferencing a void pointer, but it's completely well-defined, and such a
8784 // warning is unlikely to catch any mistakes.
8785 if (const PointerType *PT = OpTy->getAs<PointerType>())
8786 Result = PT->getPointeeType();
8787 else if (const ObjCObjectPointerType *OPT =
8788 OpTy->getAs<ObjCObjectPointerType>())
8789 Result = OPT->getPointeeType();
John McCall2cd11fe2010-10-12 02:09:17 +00008790 else {
John McCallfb8721c2011-04-10 19:13:55 +00008791 ExprResult PR = S.CheckPlaceholderExpr(Op);
John McCall2cd11fe2010-10-12 02:09:17 +00008792 if (PR.isInvalid()) return QualType();
John McCall09431682010-11-18 19:01:18 +00008793 if (PR.take() != Op)
8794 return CheckIndirectionOperand(S, PR.take(), VK, OpLoc);
John McCall2cd11fe2010-10-12 02:09:17 +00008795 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008796
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00008797 if (Result.isNull()) {
John McCall09431682010-11-18 19:01:18 +00008798 S.Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer)
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00008799 << OpTy << Op->getSourceRange();
8800 return QualType();
8801 }
John McCall09431682010-11-18 19:01:18 +00008802
8803 // Dereferences are usually l-values...
8804 VK = VK_LValue;
8805
8806 // ...except that certain expressions are never l-values in C.
8807 if (!S.getLangOptions().CPlusPlus &&
8808 IsCForbiddenLValueType(S.Context, Result))
8809 VK = VK_RValue;
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00008810
8811 return Result;
Reid Spencer5f016e22007-07-11 17:01:13 +00008812}
8813
John McCall2de56d12010-08-25 11:45:40 +00008814static inline BinaryOperatorKind ConvertTokenKindToBinaryOpcode(
Reid Spencer5f016e22007-07-11 17:01:13 +00008815 tok::TokenKind Kind) {
John McCall2de56d12010-08-25 11:45:40 +00008816 BinaryOperatorKind Opc;
Reid Spencer5f016e22007-07-11 17:01:13 +00008817 switch (Kind) {
8818 default: assert(0 && "Unknown binop!");
John McCall2de56d12010-08-25 11:45:40 +00008819 case tok::periodstar: Opc = BO_PtrMemD; break;
8820 case tok::arrowstar: Opc = BO_PtrMemI; break;
8821 case tok::star: Opc = BO_Mul; break;
8822 case tok::slash: Opc = BO_Div; break;
8823 case tok::percent: Opc = BO_Rem; break;
8824 case tok::plus: Opc = BO_Add; break;
8825 case tok::minus: Opc = BO_Sub; break;
8826 case tok::lessless: Opc = BO_Shl; break;
8827 case tok::greatergreater: Opc = BO_Shr; break;
8828 case tok::lessequal: Opc = BO_LE; break;
8829 case tok::less: Opc = BO_LT; break;
8830 case tok::greaterequal: Opc = BO_GE; break;
8831 case tok::greater: Opc = BO_GT; break;
8832 case tok::exclaimequal: Opc = BO_NE; break;
8833 case tok::equalequal: Opc = BO_EQ; break;
8834 case tok::amp: Opc = BO_And; break;
8835 case tok::caret: Opc = BO_Xor; break;
8836 case tok::pipe: Opc = BO_Or; break;
8837 case tok::ampamp: Opc = BO_LAnd; break;
8838 case tok::pipepipe: Opc = BO_LOr; break;
8839 case tok::equal: Opc = BO_Assign; break;
8840 case tok::starequal: Opc = BO_MulAssign; break;
8841 case tok::slashequal: Opc = BO_DivAssign; break;
8842 case tok::percentequal: Opc = BO_RemAssign; break;
8843 case tok::plusequal: Opc = BO_AddAssign; break;
8844 case tok::minusequal: Opc = BO_SubAssign; break;
8845 case tok::lesslessequal: Opc = BO_ShlAssign; break;
8846 case tok::greatergreaterequal: Opc = BO_ShrAssign; break;
8847 case tok::ampequal: Opc = BO_AndAssign; break;
8848 case tok::caretequal: Opc = BO_XorAssign; break;
8849 case tok::pipeequal: Opc = BO_OrAssign; break;
8850 case tok::comma: Opc = BO_Comma; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00008851 }
8852 return Opc;
8853}
8854
John McCall2de56d12010-08-25 11:45:40 +00008855static inline UnaryOperatorKind ConvertTokenKindToUnaryOpcode(
Reid Spencer5f016e22007-07-11 17:01:13 +00008856 tok::TokenKind Kind) {
John McCall2de56d12010-08-25 11:45:40 +00008857 UnaryOperatorKind Opc;
Reid Spencer5f016e22007-07-11 17:01:13 +00008858 switch (Kind) {
8859 default: assert(0 && "Unknown unary op!");
John McCall2de56d12010-08-25 11:45:40 +00008860 case tok::plusplus: Opc = UO_PreInc; break;
8861 case tok::minusminus: Opc = UO_PreDec; break;
8862 case tok::amp: Opc = UO_AddrOf; break;
8863 case tok::star: Opc = UO_Deref; break;
8864 case tok::plus: Opc = UO_Plus; break;
8865 case tok::minus: Opc = UO_Minus; break;
8866 case tok::tilde: Opc = UO_Not; break;
8867 case tok::exclaim: Opc = UO_LNot; break;
8868 case tok::kw___real: Opc = UO_Real; break;
8869 case tok::kw___imag: Opc = UO_Imag; break;
8870 case tok::kw___extension__: Opc = UO_Extension; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00008871 }
8872 return Opc;
8873}
8874
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00008875/// DiagnoseSelfAssignment - Emits a warning if a value is assigned to itself.
8876/// This warning is only emitted for builtin assignment operations. It is also
8877/// suppressed in the event of macro expansions.
8878static void DiagnoseSelfAssignment(Sema &S, Expr *lhs, Expr *rhs,
8879 SourceLocation OpLoc) {
8880 if (!S.ActiveTemplateInstantiations.empty())
8881 return;
8882 if (OpLoc.isInvalid() || OpLoc.isMacroID())
8883 return;
8884 lhs = lhs->IgnoreParenImpCasts();
8885 rhs = rhs->IgnoreParenImpCasts();
8886 const DeclRefExpr *LeftDeclRef = dyn_cast<DeclRefExpr>(lhs);
8887 const DeclRefExpr *RightDeclRef = dyn_cast<DeclRefExpr>(rhs);
8888 if (!LeftDeclRef || !RightDeclRef ||
8889 LeftDeclRef->getLocation().isMacroID() ||
8890 RightDeclRef->getLocation().isMacroID())
8891 return;
8892 const ValueDecl *LeftDecl =
8893 cast<ValueDecl>(LeftDeclRef->getDecl()->getCanonicalDecl());
8894 const ValueDecl *RightDecl =
8895 cast<ValueDecl>(RightDeclRef->getDecl()->getCanonicalDecl());
8896 if (LeftDecl != RightDecl)
8897 return;
8898 if (LeftDecl->getType().isVolatileQualified())
8899 return;
8900 if (const ReferenceType *RefTy = LeftDecl->getType()->getAs<ReferenceType>())
8901 if (RefTy->getPointeeType().isVolatileQualified())
8902 return;
8903
8904 S.Diag(OpLoc, diag::warn_self_assignment)
8905 << LeftDeclRef->getType()
8906 << lhs->getSourceRange() << rhs->getSourceRange();
8907}
8908
Douglas Gregoreaebc752008-11-06 23:29:22 +00008909/// CreateBuiltinBinOp - Creates a new built-in binary operation with
8910/// operator @p Opc at location @c TokLoc. This routine only supports
8911/// built-in operations; ActOnBinOp handles overloaded operators.
John McCall60d7b3a2010-08-24 06:29:42 +00008912ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc,
Argyrios Kyrtzidisb1fa3dc2011-01-05 20:09:36 +00008913 BinaryOperatorKind Opc,
John Wiegley429bb272011-04-08 18:41:53 +00008914 Expr *lhsExpr, Expr *rhsExpr) {
8915 ExprResult lhs = Owned(lhsExpr), rhs = Owned(rhsExpr);
Eli Friedmanab3a8522009-03-28 01:22:36 +00008916 QualType ResultTy; // Result type of the binary operator.
Eli Friedmanab3a8522009-03-28 01:22:36 +00008917 // The following two variables are used for compound assignment operators
8918 QualType CompLHSTy; // Type of LHS after promotions for computation
8919 QualType CompResultTy; // Type of computation result
John McCallf89e55a2010-11-18 06:31:45 +00008920 ExprValueKind VK = VK_RValue;
8921 ExprObjectKind OK = OK_Ordinary;
Douglas Gregoreaebc752008-11-06 23:29:22 +00008922
Douglas Gregorfadb53b2011-03-12 01:48:56 +00008923 // Check if a 'foo<int>' involved in a binary op, identifies a single
8924 // function unambiguously (i.e. an lvalue ala 13.4)
8925 // But since an assignment can trigger target based overload, exclude it in
8926 // our blind search. i.e:
8927 // template<class T> void f(); template<class T, class U> void f(U);
8928 // f<int> == 0; // resolve f<int> blindly
8929 // void (*p)(int); p = f<int>; // resolve f<int> using target
8930 if (Opc != BO_Assign) {
John McCallfb8721c2011-04-10 19:13:55 +00008931 ExprResult resolvedLHS = CheckPlaceholderExpr(lhs.get());
John McCall1de4d4e2011-04-07 08:22:57 +00008932 if (!resolvedLHS.isUsable()) return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00008933 lhs = move(resolvedLHS);
John McCall1de4d4e2011-04-07 08:22:57 +00008934
John McCallfb8721c2011-04-10 19:13:55 +00008935 ExprResult resolvedRHS = CheckPlaceholderExpr(rhs.get());
John McCall1de4d4e2011-04-07 08:22:57 +00008936 if (!resolvedRHS.isUsable()) return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00008937 rhs = move(resolvedRHS);
Douglas Gregorfadb53b2011-03-12 01:48:56 +00008938 }
8939
Eli Friedmaned3b2562011-06-17 20:52:22 +00008940 // The canonical way to check for a GNU null is with isNullPointerConstant,
8941 // but we use a bit of a hack here for speed; this is a relatively
8942 // hot path, and isNullPointerConstant is slow.
8943 bool LeftNull = isa<GNUNullExpr>(lhs.get()->IgnoreParenImpCasts());
8944 bool RightNull = isa<GNUNullExpr>(rhs.get()->IgnoreParenImpCasts());
Richard Trieu3e95ba92011-06-16 21:36:56 +00008945
8946 // Detect when a NULL constant is used improperly in an expression. These
8947 // are mainly cases where the null pointer is used as an integer instead
8948 // of a pointer.
8949 if (LeftNull || RightNull) {
Chandler Carruth1567a8b2011-06-20 07:38:51 +00008950 // Avoid analyzing cases where the result will either be invalid (and
8951 // diagnosed as such) or entirely valid and not something to warn about.
8952 QualType LeftType = lhs.get()->getType();
8953 QualType RightType = rhs.get()->getType();
8954 if (!LeftType->isBlockPointerType() && !LeftType->isMemberPointerType() &&
8955 !LeftType->isFunctionType() &&
8956 !RightType->isBlockPointerType() &&
8957 !RightType->isMemberPointerType() &&
8958 !RightType->isFunctionType()) {
8959 if (Opc == BO_Mul || Opc == BO_Div || Opc == BO_Rem || Opc == BO_Add ||
8960 Opc == BO_Sub || Opc == BO_Shl || Opc == BO_Shr || Opc == BO_And ||
8961 Opc == BO_Xor || Opc == BO_Or || Opc == BO_MulAssign ||
8962 Opc == BO_DivAssign || Opc == BO_AddAssign || Opc == BO_SubAssign ||
8963 Opc == BO_RemAssign || Opc == BO_ShlAssign || Opc == BO_ShrAssign ||
8964 Opc == BO_AndAssign || Opc == BO_OrAssign || Opc == BO_XorAssign) {
8965 // These are the operations that would not make sense with a null pointer
8966 // no matter what the other expression is.
Chandler Carruth2af68e42011-06-19 09:05:14 +00008967 Diag(OpLoc, diag::warn_null_in_arithmetic_operation)
Chandler Carruth1567a8b2011-06-20 07:38:51 +00008968 << (LeftNull ? lhs.get()->getSourceRange() : SourceRange())
8969 << (RightNull ? rhs.get()->getSourceRange() : SourceRange());
8970 } else if (Opc == BO_LE || Opc == BO_LT || Opc == BO_GE || Opc == BO_GT ||
8971 Opc == BO_EQ || Opc == BO_NE) {
8972 // These are the operations that would not make sense with a null pointer
8973 // if the other expression the other expression is not a pointer.
8974 if (LeftNull != RightNull &&
8975 !LeftType->isAnyPointerType() &&
8976 !LeftType->canDecayToPointerType() &&
8977 !RightType->isAnyPointerType() &&
8978 !RightType->canDecayToPointerType()) {
8979 Diag(OpLoc, diag::warn_null_in_arithmetic_operation)
8980 << (LeftNull ? lhs.get()->getSourceRange()
8981 : rhs.get()->getSourceRange());
8982 }
Richard Trieu3e95ba92011-06-16 21:36:56 +00008983 }
8984 }
8985 }
8986
Douglas Gregoreaebc752008-11-06 23:29:22 +00008987 switch (Opc) {
John McCall2de56d12010-08-25 11:45:40 +00008988 case BO_Assign:
John Wiegley429bb272011-04-08 18:41:53 +00008989 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, QualType());
John McCallf6a16482010-12-04 03:47:34 +00008990 if (getLangOptions().CPlusPlus &&
John Wiegley429bb272011-04-08 18:41:53 +00008991 lhs.get()->getObjectKind() != OK_ObjCProperty) {
8992 VK = lhs.get()->getValueKind();
8993 OK = lhs.get()->getObjectKind();
John McCallf89e55a2010-11-18 06:31:45 +00008994 }
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00008995 if (!ResultTy.isNull())
John Wiegley429bb272011-04-08 18:41:53 +00008996 DiagnoseSelfAssignment(*this, lhs.get(), rhs.get(), OpLoc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00008997 break;
John McCall2de56d12010-08-25 11:45:40 +00008998 case BO_PtrMemD:
8999 case BO_PtrMemI:
John McCallf89e55a2010-11-18 06:31:45 +00009000 ResultTy = CheckPointerToMemberOperands(lhs, rhs, VK, OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00009001 Opc == BO_PtrMemI);
Sebastian Redl22460502009-02-07 00:15:38 +00009002 break;
John McCall2de56d12010-08-25 11:45:40 +00009003 case BO_Mul:
9004 case BO_Div:
Chris Lattner7ef655a2010-01-12 21:23:57 +00009005 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, false,
John McCall2de56d12010-08-25 11:45:40 +00009006 Opc == BO_Div);
Douglas Gregoreaebc752008-11-06 23:29:22 +00009007 break;
John McCall2de56d12010-08-25 11:45:40 +00009008 case BO_Rem:
Douglas Gregoreaebc752008-11-06 23:29:22 +00009009 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc);
9010 break;
John McCall2de56d12010-08-25 11:45:40 +00009011 case BO_Add:
Douglas Gregoreaebc752008-11-06 23:29:22 +00009012 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc);
9013 break;
John McCall2de56d12010-08-25 11:45:40 +00009014 case BO_Sub:
Douglas Gregoreaebc752008-11-06 23:29:22 +00009015 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc);
9016 break;
John McCall2de56d12010-08-25 11:45:40 +00009017 case BO_Shl:
9018 case BO_Shr:
Chandler Carruth21206d52011-02-23 23:34:11 +00009019 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc, Opc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00009020 break;
John McCall2de56d12010-08-25 11:45:40 +00009021 case BO_LE:
9022 case BO_LT:
9023 case BO_GE:
9024 case BO_GT:
Douglas Gregora86b8322009-04-06 18:45:53 +00009025 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true);
Douglas Gregoreaebc752008-11-06 23:29:22 +00009026 break;
John McCall2de56d12010-08-25 11:45:40 +00009027 case BO_EQ:
9028 case BO_NE:
Douglas Gregora86b8322009-04-06 18:45:53 +00009029 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false);
Douglas Gregoreaebc752008-11-06 23:29:22 +00009030 break;
John McCall2de56d12010-08-25 11:45:40 +00009031 case BO_And:
9032 case BO_Xor:
9033 case BO_Or:
Douglas Gregoreaebc752008-11-06 23:29:22 +00009034 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc);
9035 break;
John McCall2de56d12010-08-25 11:45:40 +00009036 case BO_LAnd:
9037 case BO_LOr:
Chris Lattner90a8f272010-07-13 19:41:32 +00009038 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc, Opc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00009039 break;
John McCall2de56d12010-08-25 11:45:40 +00009040 case BO_MulAssign:
9041 case BO_DivAssign:
Chris Lattner7ef655a2010-01-12 21:23:57 +00009042 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true,
John McCallf89e55a2010-11-18 06:31:45 +00009043 Opc == BO_DivAssign);
Eli Friedmanab3a8522009-03-28 01:22:36 +00009044 CompLHSTy = CompResultTy;
John Wiegley429bb272011-04-08 18:41:53 +00009045 if (!CompResultTy.isNull() && !lhs.isInvalid() && !rhs.isInvalid())
9046 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00009047 break;
John McCall2de56d12010-08-25 11:45:40 +00009048 case BO_RemAssign:
Eli Friedmanab3a8522009-03-28 01:22:36 +00009049 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true);
9050 CompLHSTy = CompResultTy;
John Wiegley429bb272011-04-08 18:41:53 +00009051 if (!CompResultTy.isNull() && !lhs.isInvalid() && !rhs.isInvalid())
9052 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00009053 break;
John McCall2de56d12010-08-25 11:45:40 +00009054 case BO_AddAssign:
Eli Friedmanab3a8522009-03-28 01:22:36 +00009055 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy);
John Wiegley429bb272011-04-08 18:41:53 +00009056 if (!CompResultTy.isNull() && !lhs.isInvalid() && !rhs.isInvalid())
9057 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00009058 break;
John McCall2de56d12010-08-25 11:45:40 +00009059 case BO_SubAssign:
Eli Friedmanab3a8522009-03-28 01:22:36 +00009060 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy);
John Wiegley429bb272011-04-08 18:41:53 +00009061 if (!CompResultTy.isNull() && !lhs.isInvalid() && !rhs.isInvalid())
9062 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00009063 break;
John McCall2de56d12010-08-25 11:45:40 +00009064 case BO_ShlAssign:
9065 case BO_ShrAssign:
Chandler Carruth21206d52011-02-23 23:34:11 +00009066 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, Opc, true);
Eli Friedmanab3a8522009-03-28 01:22:36 +00009067 CompLHSTy = CompResultTy;
John Wiegley429bb272011-04-08 18:41:53 +00009068 if (!CompResultTy.isNull() && !lhs.isInvalid() && !rhs.isInvalid())
9069 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00009070 break;
John McCall2de56d12010-08-25 11:45:40 +00009071 case BO_AndAssign:
9072 case BO_XorAssign:
9073 case BO_OrAssign:
Eli Friedmanab3a8522009-03-28 01:22:36 +00009074 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true);
9075 CompLHSTy = CompResultTy;
John Wiegley429bb272011-04-08 18:41:53 +00009076 if (!CompResultTy.isNull() && !lhs.isInvalid() && !rhs.isInvalid())
9077 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00009078 break;
John McCall2de56d12010-08-25 11:45:40 +00009079 case BO_Comma:
John McCall09431682010-11-18 19:01:18 +00009080 ResultTy = CheckCommaOperands(*this, lhs, rhs, OpLoc);
John Wiegley429bb272011-04-08 18:41:53 +00009081 if (getLangOptions().CPlusPlus && !rhs.isInvalid()) {
9082 VK = rhs.get()->getValueKind();
9083 OK = rhs.get()->getObjectKind();
John McCallf89e55a2010-11-18 06:31:45 +00009084 }
Douglas Gregoreaebc752008-11-06 23:29:22 +00009085 break;
9086 }
John Wiegley429bb272011-04-08 18:41:53 +00009087 if (ResultTy.isNull() || lhs.isInvalid() || rhs.isInvalid())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00009088 return ExprError();
Eli Friedmanab3a8522009-03-28 01:22:36 +00009089 if (CompResultTy.isNull())
John Wiegley429bb272011-04-08 18:41:53 +00009090 return Owned(new (Context) BinaryOperator(lhs.take(), rhs.take(), Opc,
9091 ResultTy, VK, OK, OpLoc));
9092 if (getLangOptions().CPlusPlus && lhs.get()->getObjectKind() != OK_ObjCProperty) {
John McCallf89e55a2010-11-18 06:31:45 +00009093 VK = VK_LValue;
John Wiegley429bb272011-04-08 18:41:53 +00009094 OK = lhs.get()->getObjectKind();
John McCallf89e55a2010-11-18 06:31:45 +00009095 }
John Wiegley429bb272011-04-08 18:41:53 +00009096 return Owned(new (Context) CompoundAssignOperator(lhs.take(), rhs.take(), Opc,
9097 ResultTy, VK, OK, CompLHSTy,
John McCallf89e55a2010-11-18 06:31:45 +00009098 CompResultTy, OpLoc));
Douglas Gregoreaebc752008-11-06 23:29:22 +00009099}
9100
Sebastian Redlaee3c932009-10-27 12:10:02 +00009101/// DiagnoseBitwisePrecedence - Emit a warning when bitwise and comparison
9102/// operators are mixed in a way that suggests that the programmer forgot that
9103/// comparison operators have higher precedence. The most typical example of
9104/// such code is "flags & 0x0020 != 0", which is equivalent to "flags & 1".
John McCall2de56d12010-08-25 11:45:40 +00009105static void DiagnoseBitwisePrecedence(Sema &Self, BinaryOperatorKind Opc,
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00009106 SourceLocation OpLoc,Expr *lhs,Expr *rhs){
Sebastian Redlaee3c932009-10-27 12:10:02 +00009107 typedef BinaryOperator BinOp;
9108 BinOp::Opcode lhsopc = static_cast<BinOp::Opcode>(-1),
9109 rhsopc = static_cast<BinOp::Opcode>(-1);
9110 if (BinOp *BO = dyn_cast<BinOp>(lhs))
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00009111 lhsopc = BO->getOpcode();
Sebastian Redlaee3c932009-10-27 12:10:02 +00009112 if (BinOp *BO = dyn_cast<BinOp>(rhs))
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00009113 rhsopc = BO->getOpcode();
9114
9115 // Subs are not binary operators.
9116 if (lhsopc == -1 && rhsopc == -1)
9117 return;
9118
9119 // Bitwise operations are sometimes used as eager logical ops.
9120 // Don't diagnose this.
Sebastian Redlaee3c932009-10-27 12:10:02 +00009121 if ((BinOp::isComparisonOp(lhsopc) || BinOp::isBitwiseOp(lhsopc)) &&
9122 (BinOp::isComparisonOp(rhsopc) || BinOp::isBitwiseOp(rhsopc)))
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00009123 return;
9124
Chandler Carruthf0b60d62011-06-16 01:05:14 +00009125 if (BinOp::isComparisonOp(lhsopc)) {
9126 Self.Diag(OpLoc, diag::warn_precedence_bitwise_rel)
9127 << SourceRange(lhs->getLocStart(), OpLoc)
9128 << BinOp::getOpcodeStr(Opc) << BinOp::getOpcodeStr(lhsopc);
Sebastian Redl6b169ac2009-10-26 17:01:32 +00009129 SuggestParentheses(Self, OpLoc,
Douglas Gregor55b38842010-04-14 16:09:52 +00009130 Self.PDiag(diag::note_precedence_bitwise_silence)
9131 << BinOp::getOpcodeStr(lhsopc),
Chandler Carruthf0b60d62011-06-16 01:05:14 +00009132 lhs->getSourceRange());
9133 SuggestParentheses(Self, OpLoc,
Argyrios Kyrtzidisabdd3b32011-04-25 23:01:29 +00009134 Self.PDiag(diag::note_precedence_bitwise_first)
9135 << BinOp::getOpcodeStr(Opc),
9136 SourceRange(cast<BinOp>(lhs)->getRHS()->getLocStart(), rhs->getLocEnd()));
Chandler Carruthf0b60d62011-06-16 01:05:14 +00009137 } else if (BinOp::isComparisonOp(rhsopc)) {
9138 Self.Diag(OpLoc, diag::warn_precedence_bitwise_rel)
9139 << SourceRange(OpLoc, rhs->getLocEnd())
9140 << BinOp::getOpcodeStr(Opc) << BinOp::getOpcodeStr(rhsopc);
Sebastian Redl6b169ac2009-10-26 17:01:32 +00009141 SuggestParentheses(Self, OpLoc,
Argyrios Kyrtzidisabdd3b32011-04-25 23:01:29 +00009142 Self.PDiag(diag::note_precedence_bitwise_silence)
9143 << BinOp::getOpcodeStr(rhsopc),
Chandler Carruthf0b60d62011-06-16 01:05:14 +00009144 rhs->getSourceRange());
9145 SuggestParentheses(Self, OpLoc,
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00009146 Self.PDiag(diag::note_precedence_bitwise_first)
Douglas Gregor827feec2010-01-08 00:20:23 +00009147 << BinOp::getOpcodeStr(Opc),
Douglas Gregorb27c7a12011-06-22 18:41:08 +00009148 SourceRange(lhs->getLocStart(),
9149 cast<BinOp>(rhs)->getLHS()->getLocStart()));
Chandler Carruthf0b60d62011-06-16 01:05:14 +00009150 }
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00009151}
9152
Argyrios Kyrtzidis33f46e22011-06-20 18:41:26 +00009153/// \brief It accepts a '&' expr that is inside a '|' one.
9154/// Emit a diagnostic together with a fixit hint that wraps the '&' expression
9155/// in parentheses.
9156static void
9157EmitDiagnosticForBitwiseAndInBitwiseOr(Sema &Self, SourceLocation OpLoc,
9158 BinaryOperator *Bop) {
9159 assert(Bop->getOpcode() == BO_And);
9160 Self.Diag(Bop->getOperatorLoc(), diag::warn_bitwise_and_in_bitwise_or)
9161 << Bop->getSourceRange() << OpLoc;
9162 SuggestParentheses(Self, Bop->getOperatorLoc(),
9163 Self.PDiag(diag::note_bitwise_and_in_bitwise_or_silence),
9164 Bop->getSourceRange());
9165}
9166
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00009167/// \brief It accepts a '&&' expr that is inside a '||' one.
9168/// Emit a diagnostic together with a fixit hint that wraps the '&&' expression
9169/// in parentheses.
9170static void
9171EmitDiagnosticForLogicalAndInLogicalOr(Sema &Self, SourceLocation OpLoc,
Argyrios Kyrtzidisa61aedc2011-04-22 19:16:27 +00009172 BinaryOperator *Bop) {
9173 assert(Bop->getOpcode() == BO_LAnd);
Chandler Carruthf0b60d62011-06-16 01:05:14 +00009174 Self.Diag(Bop->getOperatorLoc(), diag::warn_logical_and_in_logical_or)
9175 << Bop->getSourceRange() << OpLoc;
Argyrios Kyrtzidisa61aedc2011-04-22 19:16:27 +00009176 SuggestParentheses(Self, Bop->getOperatorLoc(),
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00009177 Self.PDiag(diag::note_logical_and_in_logical_or_silence),
Chandler Carruthf0b60d62011-06-16 01:05:14 +00009178 Bop->getSourceRange());
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00009179}
9180
9181/// \brief Returns true if the given expression can be evaluated as a constant
9182/// 'true'.
9183static bool EvaluatesAsTrue(Sema &S, Expr *E) {
9184 bool Res;
9185 return E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && Res;
9186}
9187
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00009188/// \brief Returns true if the given expression can be evaluated as a constant
9189/// 'false'.
9190static bool EvaluatesAsFalse(Sema &S, Expr *E) {
9191 bool Res;
9192 return E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && !Res;
9193}
9194
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00009195/// \brief Look for '&&' in the left hand of a '||' expr.
9196static void DiagnoseLogicalAndInLogicalOrLHS(Sema &S, SourceLocation OpLoc,
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00009197 Expr *OrLHS, Expr *OrRHS) {
9198 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(OrLHS)) {
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00009199 if (Bop->getOpcode() == BO_LAnd) {
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00009200 // If it's "a && b || 0" don't warn since the precedence doesn't matter.
9201 if (EvaluatesAsFalse(S, OrRHS))
9202 return;
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00009203 // If it's "1 && a || b" don't warn since the precedence doesn't matter.
9204 if (!EvaluatesAsTrue(S, Bop->getLHS()))
9205 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
9206 } else if (Bop->getOpcode() == BO_LOr) {
9207 if (BinaryOperator *RBop = dyn_cast<BinaryOperator>(Bop->getRHS())) {
9208 // If it's "a || b && 1 || c" we didn't warn earlier for
9209 // "a || b && 1", but warn now.
9210 if (RBop->getOpcode() == BO_LAnd && EvaluatesAsTrue(S, RBop->getRHS()))
9211 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, RBop);
9212 }
9213 }
9214 }
9215}
9216
9217/// \brief Look for '&&' in the right hand of a '||' expr.
9218static void DiagnoseLogicalAndInLogicalOrRHS(Sema &S, SourceLocation OpLoc,
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00009219 Expr *OrLHS, Expr *OrRHS) {
9220 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(OrRHS)) {
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00009221 if (Bop->getOpcode() == BO_LAnd) {
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00009222 // If it's "0 || a && b" don't warn since the precedence doesn't matter.
9223 if (EvaluatesAsFalse(S, OrLHS))
9224 return;
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00009225 // If it's "a || b && 1" don't warn since the precedence doesn't matter.
9226 if (!EvaluatesAsTrue(S, Bop->getRHS()))
9227 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00009228 }
9229 }
9230}
9231
Argyrios Kyrtzidis33f46e22011-06-20 18:41:26 +00009232/// \brief Look for '&' in the left or right hand of a '|' expr.
9233static void DiagnoseBitwiseAndInBitwiseOr(Sema &S, SourceLocation OpLoc,
9234 Expr *OrArg) {
9235 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(OrArg)) {
9236 if (Bop->getOpcode() == BO_And)
9237 return EmitDiagnosticForBitwiseAndInBitwiseOr(S, OpLoc, Bop);
9238 }
9239}
9240
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00009241/// DiagnoseBinOpPrecedence - Emit warnings for expressions with tricky
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00009242/// precedence.
John McCall2de56d12010-08-25 11:45:40 +00009243static void DiagnoseBinOpPrecedence(Sema &Self, BinaryOperatorKind Opc,
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00009244 SourceLocation OpLoc, Expr *lhs, Expr *rhs){
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00009245 // Diagnose "arg1 'bitwise' arg2 'eq' arg3".
Sebastian Redlaee3c932009-10-27 12:10:02 +00009246 if (BinaryOperator::isBitwiseOp(Opc))
Argyrios Kyrtzidis33f46e22011-06-20 18:41:26 +00009247 DiagnoseBitwisePrecedence(Self, Opc, OpLoc, lhs, rhs);
9248
9249 // Diagnose "arg1 & arg2 | arg3"
9250 if (Opc == BO_Or && !OpLoc.isMacroID()/* Don't warn in macros. */) {
9251 DiagnoseBitwiseAndInBitwiseOr(Self, OpLoc, lhs);
9252 DiagnoseBitwiseAndInBitwiseOr(Self, OpLoc, rhs);
9253 }
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00009254
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00009255 // Warn about arg1 || arg2 && arg3, as GCC 4.3+ does.
9256 // We don't warn for 'assert(a || b && "bad")' since this is safe.
Argyrios Kyrtzidisd92ccaa2010-11-17 18:54:22 +00009257 if (Opc == BO_LOr && !OpLoc.isMacroID()/* Don't warn in macros. */) {
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00009258 DiagnoseLogicalAndInLogicalOrLHS(Self, OpLoc, lhs, rhs);
9259 DiagnoseLogicalAndInLogicalOrRHS(Self, OpLoc, lhs, rhs);
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00009260 }
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00009261}
9262
Reid Spencer5f016e22007-07-11 17:01:13 +00009263// Binary Operators. 'Tok' is the token for the operator.
John McCall60d7b3a2010-08-24 06:29:42 +00009264ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc,
John McCall2de56d12010-08-25 11:45:40 +00009265 tok::TokenKind Kind,
9266 Expr *lhs, Expr *rhs) {
9267 BinaryOperatorKind Opc = ConvertTokenKindToBinaryOpcode(Kind);
Steve Narofff69936d2007-09-16 03:34:24 +00009268 assert((lhs != 0) && "ActOnBinOp(): missing left expression");
9269 assert((rhs != 0) && "ActOnBinOp(): missing right expression");
Reid Spencer5f016e22007-07-11 17:01:13 +00009270
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00009271 // Emit warnings for tricky precedence issues, e.g. "bitfield & 0x4 == 0"
9272 DiagnoseBinOpPrecedence(*this, Opc, TokLoc, lhs, rhs);
9273
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00009274 return BuildBinOp(S, TokLoc, Opc, lhs, rhs);
9275}
9276
John McCall60d7b3a2010-08-24 06:29:42 +00009277ExprResult Sema::BuildBinOp(Scope *S, SourceLocation OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00009278 BinaryOperatorKind Opc,
9279 Expr *lhs, Expr *rhs) {
John McCall01b2e4e2010-12-06 05:26:58 +00009280 if (getLangOptions().CPlusPlus) {
9281 bool UseBuiltinOperator;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009282
John McCall01b2e4e2010-12-06 05:26:58 +00009283 if (lhs->isTypeDependent() || rhs->isTypeDependent()) {
9284 UseBuiltinOperator = false;
9285 } else if (Opc == BO_Assign && lhs->getObjectKind() == OK_ObjCProperty) {
9286 UseBuiltinOperator = true;
9287 } else {
9288 UseBuiltinOperator = !lhs->getType()->isOverloadableType() &&
9289 !rhs->getType()->isOverloadableType();
9290 }
9291
9292 if (!UseBuiltinOperator) {
9293 // Find all of the overloaded operators visible from this
9294 // point. We perform both an operator-name lookup from the local
9295 // scope and an argument-dependent lookup based on the types of
9296 // the arguments.
9297 UnresolvedSet<16> Functions;
9298 OverloadedOperatorKind OverOp
9299 = BinaryOperator::getOverloadedOperator(Opc);
9300 if (S && OverOp != OO_None)
9301 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(),
9302 Functions);
9303
9304 // Build the (potentially-overloaded, potentially-dependent)
9305 // binary operation.
9306 return CreateOverloadedBinOp(OpLoc, Opc, Functions, lhs, rhs);
9307 }
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00009308 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009309
Douglas Gregoreaebc752008-11-06 23:29:22 +00009310 // Build a built-in binary operation.
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00009311 return CreateBuiltinBinOp(OpLoc, Opc, lhs, rhs);
Reid Spencer5f016e22007-07-11 17:01:13 +00009312}
9313
John McCall60d7b3a2010-08-24 06:29:42 +00009314ExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc,
Argyrios Kyrtzidisb1fa3dc2011-01-05 20:09:36 +00009315 UnaryOperatorKind Opc,
John Wiegley429bb272011-04-08 18:41:53 +00009316 Expr *InputExpr) {
9317 ExprResult Input = Owned(InputExpr);
John McCallf89e55a2010-11-18 06:31:45 +00009318 ExprValueKind VK = VK_RValue;
9319 ExprObjectKind OK = OK_Ordinary;
Reid Spencer5f016e22007-07-11 17:01:13 +00009320 QualType resultType;
9321 switch (Opc) {
John McCall2de56d12010-08-25 11:45:40 +00009322 case UO_PreInc:
9323 case UO_PreDec:
9324 case UO_PostInc:
9325 case UO_PostDec:
John Wiegley429bb272011-04-08 18:41:53 +00009326 resultType = CheckIncrementDecrementOperand(*this, Input.get(), VK, OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00009327 Opc == UO_PreInc ||
9328 Opc == UO_PostInc,
9329 Opc == UO_PreInc ||
9330 Opc == UO_PreDec);
Reid Spencer5f016e22007-07-11 17:01:13 +00009331 break;
John McCall2de56d12010-08-25 11:45:40 +00009332 case UO_AddrOf:
John Wiegley429bb272011-04-08 18:41:53 +00009333 resultType = CheckAddressOfOperand(*this, Input.get(), OpLoc);
Reid Spencer5f016e22007-07-11 17:01:13 +00009334 break;
John McCall1de4d4e2011-04-07 08:22:57 +00009335 case UO_Deref: {
John McCallfb8721c2011-04-10 19:13:55 +00009336 ExprResult resolved = CheckPlaceholderExpr(Input.get());
John McCall1de4d4e2011-04-07 08:22:57 +00009337 if (!resolved.isUsable()) return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00009338 Input = move(resolved);
9339 Input = DefaultFunctionArrayLvalueConversion(Input.take());
9340 resultType = CheckIndirectionOperand(*this, Input.get(), VK, OpLoc);
Reid Spencer5f016e22007-07-11 17:01:13 +00009341 break;
John McCall1de4d4e2011-04-07 08:22:57 +00009342 }
John McCall2de56d12010-08-25 11:45:40 +00009343 case UO_Plus:
9344 case UO_Minus:
John Wiegley429bb272011-04-08 18:41:53 +00009345 Input = UsualUnaryConversions(Input.take());
9346 if (Input.isInvalid()) return ExprError();
9347 resultType = Input.get()->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00009348 if (resultType->isDependentType())
9349 break;
Douglas Gregor00619622010-06-22 23:41:02 +00009350 if (resultType->isArithmeticType() || // C99 6.5.3.3p1
9351 resultType->isVectorType())
Douglas Gregor74253732008-11-19 15:42:04 +00009352 break;
9353 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7
9354 resultType->isEnumeralType())
9355 break;
9356 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6
John McCall2de56d12010-08-25 11:45:40 +00009357 Opc == UO_Plus &&
Douglas Gregor74253732008-11-19 15:42:04 +00009358 resultType->isPointerType())
9359 break;
John McCall2cd11fe2010-10-12 02:09:17 +00009360 else if (resultType->isPlaceholderType()) {
John McCallfb8721c2011-04-10 19:13:55 +00009361 Input = CheckPlaceholderExpr(Input.take());
John Wiegley429bb272011-04-08 18:41:53 +00009362 if (Input.isInvalid()) return ExprError();
9363 return CreateBuiltinUnaryOp(OpLoc, Opc, Input.take());
John McCall2cd11fe2010-10-12 02:09:17 +00009364 }
Douglas Gregor74253732008-11-19 15:42:04 +00009365
Sebastian Redl0eb23302009-01-19 00:08:26 +00009366 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
John Wiegley429bb272011-04-08 18:41:53 +00009367 << resultType << Input.get()->getSourceRange());
9368
John McCall2de56d12010-08-25 11:45:40 +00009369 case UO_Not: // bitwise complement
John Wiegley429bb272011-04-08 18:41:53 +00009370 Input = UsualUnaryConversions(Input.take());
9371 if (Input.isInvalid()) return ExprError();
9372 resultType = Input.get()->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00009373 if (resultType->isDependentType())
9374 break;
Chris Lattner02a65142008-07-25 23:52:49 +00009375 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension.
9376 if (resultType->isComplexType() || resultType->isComplexIntegerType())
9377 // C99 does not support '~' for complex conjugation.
Chris Lattnerd3a94e22008-11-20 06:06:08 +00009378 Diag(OpLoc, diag::ext_integer_complement_complex)
John Wiegley429bb272011-04-08 18:41:53 +00009379 << resultType << Input.get()->getSourceRange();
John McCall2cd11fe2010-10-12 02:09:17 +00009380 else if (resultType->hasIntegerRepresentation())
9381 break;
9382 else if (resultType->isPlaceholderType()) {
John McCallfb8721c2011-04-10 19:13:55 +00009383 Input = CheckPlaceholderExpr(Input.take());
John Wiegley429bb272011-04-08 18:41:53 +00009384 if (Input.isInvalid()) return ExprError();
9385 return CreateBuiltinUnaryOp(OpLoc, Opc, Input.take());
John McCall2cd11fe2010-10-12 02:09:17 +00009386 } else {
Sebastian Redl0eb23302009-01-19 00:08:26 +00009387 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
John Wiegley429bb272011-04-08 18:41:53 +00009388 << resultType << Input.get()->getSourceRange());
John McCall2cd11fe2010-10-12 02:09:17 +00009389 }
Reid Spencer5f016e22007-07-11 17:01:13 +00009390 break;
John Wiegley429bb272011-04-08 18:41:53 +00009391
John McCall2de56d12010-08-25 11:45:40 +00009392 case UO_LNot: // logical negation
Reid Spencer5f016e22007-07-11 17:01:13 +00009393 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5).
John Wiegley429bb272011-04-08 18:41:53 +00009394 Input = DefaultFunctionArrayLvalueConversion(Input.take());
9395 if (Input.isInvalid()) return ExprError();
9396 resultType = Input.get()->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00009397 if (resultType->isDependentType())
9398 break;
Abramo Bagnara737d5442011-04-07 09:26:19 +00009399 if (resultType->isScalarType()) {
9400 // C99 6.5.3.3p1: ok, fallthrough;
9401 if (Context.getLangOptions().CPlusPlus) {
9402 // C++03 [expr.unary.op]p8, C++0x [expr.unary.op]p9:
9403 // operand contextually converted to bool.
John Wiegley429bb272011-04-08 18:41:53 +00009404 Input = ImpCastExprToType(Input.take(), Context.BoolTy,
9405 ScalarTypeToBooleanCastKind(resultType));
Abramo Bagnara737d5442011-04-07 09:26:19 +00009406 }
John McCall2cd11fe2010-10-12 02:09:17 +00009407 } else if (resultType->isPlaceholderType()) {
John McCallfb8721c2011-04-10 19:13:55 +00009408 Input = CheckPlaceholderExpr(Input.take());
John Wiegley429bb272011-04-08 18:41:53 +00009409 if (Input.isInvalid()) return ExprError();
9410 return CreateBuiltinUnaryOp(OpLoc, Opc, Input.take());
John McCall2cd11fe2010-10-12 02:09:17 +00009411 } else {
Sebastian Redl0eb23302009-01-19 00:08:26 +00009412 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
John Wiegley429bb272011-04-08 18:41:53 +00009413 << resultType << Input.get()->getSourceRange());
John McCall2cd11fe2010-10-12 02:09:17 +00009414 }
Douglas Gregorea844f32010-09-20 17:13:33 +00009415
Reid Spencer5f016e22007-07-11 17:01:13 +00009416 // LNot always has type int. C99 6.5.3.3p5.
Sebastian Redl0eb23302009-01-19 00:08:26 +00009417 // In C++, it's bool. C++ 5.3.1p8
Argyrios Kyrtzidis16f744b2011-02-18 20:55:15 +00009418 resultType = Context.getLogicalOperationType();
Reid Spencer5f016e22007-07-11 17:01:13 +00009419 break;
John McCall2de56d12010-08-25 11:45:40 +00009420 case UO_Real:
9421 case UO_Imag:
John McCall09431682010-11-18 19:01:18 +00009422 resultType = CheckRealImagOperand(*this, Input, OpLoc, Opc == UO_Real);
John McCallf89e55a2010-11-18 06:31:45 +00009423 // _Real and _Imag map ordinary l-values into ordinary l-values.
John Wiegley429bb272011-04-08 18:41:53 +00009424 if (Input.isInvalid()) return ExprError();
9425 if (Input.get()->getValueKind() != VK_RValue &&
9426 Input.get()->getObjectKind() == OK_Ordinary)
9427 VK = Input.get()->getValueKind();
Chris Lattnerdbb36972007-08-24 21:16:53 +00009428 break;
John McCall2de56d12010-08-25 11:45:40 +00009429 case UO_Extension:
John Wiegley429bb272011-04-08 18:41:53 +00009430 resultType = Input.get()->getType();
9431 VK = Input.get()->getValueKind();
9432 OK = Input.get()->getObjectKind();
Reid Spencer5f016e22007-07-11 17:01:13 +00009433 break;
9434 }
John Wiegley429bb272011-04-08 18:41:53 +00009435 if (resultType.isNull() || Input.isInvalid())
Sebastian Redl0eb23302009-01-19 00:08:26 +00009436 return ExprError();
Douglas Gregorbc736fc2009-03-13 23:49:33 +00009437
John Wiegley429bb272011-04-08 18:41:53 +00009438 return Owned(new (Context) UnaryOperator(Input.take(), Opc, resultType,
John McCallf89e55a2010-11-18 06:31:45 +00009439 VK, OK, OpLoc));
Reid Spencer5f016e22007-07-11 17:01:13 +00009440}
9441
John McCall60d7b3a2010-08-24 06:29:42 +00009442ExprResult Sema::BuildUnaryOp(Scope *S, SourceLocation OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00009443 UnaryOperatorKind Opc,
9444 Expr *Input) {
Anders Carlssona8a1e3d2009-11-14 21:26:41 +00009445 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType() &&
Eli Friedman957c0942010-09-05 23:15:52 +00009446 UnaryOperator::getOverloadedOperator(Opc) != OO_None) {
Douglas Gregorbc736fc2009-03-13 23:49:33 +00009447 // Find all of the overloaded operators visible from this
9448 // point. We perform both an operator-name lookup from the local
9449 // scope and an argument-dependent lookup based on the types of
9450 // the arguments.
John McCall6e266892010-01-26 03:27:55 +00009451 UnresolvedSet<16> Functions;
Douglas Gregorbc736fc2009-03-13 23:49:33 +00009452 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc);
John McCall6e266892010-01-26 03:27:55 +00009453 if (S && OverOp != OO_None)
9454 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(),
9455 Functions);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009456
John McCall9ae2f072010-08-23 23:25:46 +00009457 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, Input);
Douglas Gregorbc736fc2009-03-13 23:49:33 +00009458 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009459
John McCall9ae2f072010-08-23 23:25:46 +00009460 return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
Douglas Gregorbc736fc2009-03-13 23:49:33 +00009461}
9462
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00009463// Unary Operators. 'Tok' is the token for the operator.
John McCall60d7b3a2010-08-24 06:29:42 +00009464ExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc,
John McCallf4c73712011-01-19 06:33:43 +00009465 tok::TokenKind Op, Expr *Input) {
John McCall9ae2f072010-08-23 23:25:46 +00009466 return BuildUnaryOp(S, OpLoc, ConvertTokenKindToUnaryOpcode(Op), Input);
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00009467}
9468
Steve Naroff1b273c42007-09-16 14:56:35 +00009469/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo".
Chris Lattnerad8dcf42011-02-17 07:39:24 +00009470ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, SourceLocation LabLoc,
Chris Lattner57ad3782011-02-17 20:34:02 +00009471 LabelDecl *TheDecl) {
Chris Lattnerad8dcf42011-02-17 07:39:24 +00009472 TheDecl->setUsed();
Reid Spencer5f016e22007-07-11 17:01:13 +00009473 // Create the AST node. The address of a label always has type 'void*'.
Chris Lattnerad8dcf42011-02-17 07:39:24 +00009474 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, TheDecl,
Sebastian Redlf53597f2009-03-15 17:47:39 +00009475 Context.getPointerType(Context.VoidTy)));
Reid Spencer5f016e22007-07-11 17:01:13 +00009476}
9477
John McCallf85e1932011-06-15 23:02:42 +00009478/// Given the last statement in a statement-expression, check whether
9479/// the result is a producing expression (like a call to an
9480/// ns_returns_retained function) and, if so, rebuild it to hoist the
9481/// release out of the full-expression. Otherwise, return null.
9482/// Cannot fail.
9483static Expr *maybeRebuildARCConsumingStmt(Stmt *s) {
9484 // Should always be wrapped with one of these.
9485 ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(s);
9486 if (!cleanups) return 0;
9487
9488 ImplicitCastExpr *cast = dyn_cast<ImplicitCastExpr>(cleanups->getSubExpr());
9489 if (!cast || cast->getCastKind() != CK_ObjCConsumeObject)
9490 return 0;
9491
9492 // Splice out the cast. This shouldn't modify any interesting
9493 // features of the statement.
9494 Expr *producer = cast->getSubExpr();
9495 assert(producer->getType() == cast->getType());
9496 assert(producer->getValueKind() == cast->getValueKind());
9497 cleanups->setSubExpr(producer);
9498 return cleanups;
9499}
9500
John McCall60d7b3a2010-08-24 06:29:42 +00009501ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00009502Sema::ActOnStmtExpr(SourceLocation LPLoc, Stmt *SubStmt,
Sebastian Redlf53597f2009-03-15 17:47:39 +00009503 SourceLocation RPLoc) { // "({..})"
Chris Lattnerab18c4c2007-07-24 16:58:17 +00009504 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!");
9505 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt);
9506
Douglas Gregordd8f5692010-03-10 04:54:39 +00009507 bool isFileScope
9508 = (getCurFunctionOrMethodDecl() == 0) && (getCurBlock() == 0);
Chris Lattner4a049f02009-04-25 19:11:05 +00009509 if (isFileScope)
Sebastian Redlf53597f2009-03-15 17:47:39 +00009510 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope));
Eli Friedmandca2b732009-01-24 23:09:00 +00009511
Chris Lattnerab18c4c2007-07-24 16:58:17 +00009512 // FIXME: there are a variety of strange constraints to enforce here, for
9513 // example, it is not possible to goto into a stmt expression apparently.
9514 // More semantic analysis is needed.
Mike Stumpeed9cac2009-02-19 03:04:26 +00009515
Chris Lattnerab18c4c2007-07-24 16:58:17 +00009516 // If there are sub stmts in the compound stmt, take the type of the last one
9517 // as the type of the stmtexpr.
9518 QualType Ty = Context.VoidTy;
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009519 bool StmtExprMayBindToTemp = false;
Chris Lattner611b2ec2008-07-26 19:51:01 +00009520 if (!Compound->body_empty()) {
9521 Stmt *LastStmt = Compound->body_back();
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009522 LabelStmt *LastLabelStmt = 0;
Chris Lattner611b2ec2008-07-26 19:51:01 +00009523 // If LastStmt is a label, skip down through into the body.
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009524 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) {
9525 LastLabelStmt = Label;
Chris Lattner611b2ec2008-07-26 19:51:01 +00009526 LastStmt = Label->getSubStmt();
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009527 }
John McCallf85e1932011-06-15 23:02:42 +00009528
John Wiegley429bb272011-04-08 18:41:53 +00009529 if (Expr *LastE = dyn_cast<Expr>(LastStmt)) {
John McCallf6a16482010-12-04 03:47:34 +00009530 // Do function/array conversion on the last expression, but not
9531 // lvalue-to-rvalue. However, initialize an unqualified type.
John Wiegley429bb272011-04-08 18:41:53 +00009532 ExprResult LastExpr = DefaultFunctionArrayConversion(LastE);
9533 if (LastExpr.isInvalid())
9534 return ExprError();
9535 Ty = LastExpr.get()->getType().getUnqualifiedType();
John McCallf6a16482010-12-04 03:47:34 +00009536
John Wiegley429bb272011-04-08 18:41:53 +00009537 if (!Ty->isDependentType() && !LastExpr.get()->isTypeDependent()) {
John McCallf85e1932011-06-15 23:02:42 +00009538 // In ARC, if the final expression ends in a consume, splice
9539 // the consume out and bind it later. In the alternate case
9540 // (when dealing with a retainable type), the result
9541 // initialization will create a produce. In both cases the
9542 // result will be +1, and we'll need to balance that out with
9543 // a bind.
9544 if (Expr *rebuiltLastStmt
9545 = maybeRebuildARCConsumingStmt(LastExpr.get())) {
9546 LastExpr = rebuiltLastStmt;
9547 } else {
9548 LastExpr = PerformCopyInitialization(
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009549 InitializedEntity::InitializeResult(LPLoc,
9550 Ty,
9551 false),
9552 SourceLocation(),
John McCallf85e1932011-06-15 23:02:42 +00009553 LastExpr);
9554 }
9555
John Wiegley429bb272011-04-08 18:41:53 +00009556 if (LastExpr.isInvalid())
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009557 return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00009558 if (LastExpr.get() != 0) {
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009559 if (!LastLabelStmt)
John Wiegley429bb272011-04-08 18:41:53 +00009560 Compound->setLastStmt(LastExpr.take());
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009561 else
John Wiegley429bb272011-04-08 18:41:53 +00009562 LastLabelStmt->setSubStmt(LastExpr.take());
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009563 StmtExprMayBindToTemp = true;
9564 }
9565 }
9566 }
Chris Lattner611b2ec2008-07-26 19:51:01 +00009567 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00009568
Eli Friedmanb1d796d2009-03-23 00:24:07 +00009569 // FIXME: Check that expression type is complete/non-abstract; statement
9570 // expressions are not lvalues.
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009571 Expr *ResStmtExpr = new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc);
9572 if (StmtExprMayBindToTemp)
9573 return MaybeBindToTemporary(ResStmtExpr);
9574 return Owned(ResStmtExpr);
Chris Lattnerab18c4c2007-07-24 16:58:17 +00009575}
Steve Naroffd34e9152007-08-01 22:05:33 +00009576
John McCall60d7b3a2010-08-24 06:29:42 +00009577ExprResult Sema::BuildBuiltinOffsetOf(SourceLocation BuiltinLoc,
John McCall2cd11fe2010-10-12 02:09:17 +00009578 TypeSourceInfo *TInfo,
9579 OffsetOfComponent *CompPtr,
9580 unsigned NumComponents,
9581 SourceLocation RParenLoc) {
Douglas Gregor8ecdb652010-04-28 22:16:22 +00009582 QualType ArgTy = TInfo->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00009583 bool Dependent = ArgTy->isDependentType();
Abramo Bagnarabd054db2010-05-20 10:00:11 +00009584 SourceRange TypeRange = TInfo->getTypeLoc().getLocalSourceRange();
Douglas Gregor8ecdb652010-04-28 22:16:22 +00009585
Chris Lattner73d0d4f2007-08-30 17:45:32 +00009586 // We must have at least one component that refers to the type, and the first
9587 // one is known to be a field designator. Verify that the ArgTy represents
9588 // a struct/union/class.
Sebastian Redl28507842009-02-26 14:39:58 +00009589 if (!Dependent && !ArgTy->isRecordType())
Douglas Gregor8ecdb652010-04-28 22:16:22 +00009590 return ExprError(Diag(BuiltinLoc, diag::err_offsetof_record_type)
9591 << ArgTy << TypeRange);
9592
9593 // Type must be complete per C99 7.17p3 because a declaring a variable
9594 // with an incomplete type would be ill-formed.
9595 if (!Dependent
9596 && RequireCompleteType(BuiltinLoc, ArgTy,
9597 PDiag(diag::err_offsetof_incomplete_type)
9598 << TypeRange))
9599 return ExprError();
9600
Chris Lattner9e2b75c2007-08-31 21:49:13 +00009601 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a
9602 // GCC extension, diagnose them.
Eli Friedman35183ac2009-02-27 06:44:11 +00009603 // FIXME: This diagnostic isn't actually visible because the location is in
9604 // a system header!
Chris Lattner9e2b75c2007-08-31 21:49:13 +00009605 if (NumComponents != 1)
Chris Lattnerdcd5ef12008-11-19 05:27:50 +00009606 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator)
9607 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd);
Douglas Gregor8ecdb652010-04-28 22:16:22 +00009608
9609 bool DidWarnAboutNonPOD = false;
9610 QualType CurrentType = ArgTy;
9611 typedef OffsetOfExpr::OffsetOfNode OffsetOfNode;
9612 llvm::SmallVector<OffsetOfNode, 4> Comps;
9613 llvm::SmallVector<Expr*, 4> Exprs;
9614 for (unsigned i = 0; i != NumComponents; ++i) {
9615 const OffsetOfComponent &OC = CompPtr[i];
9616 if (OC.isBrackets) {
9617 // Offset of an array sub-field. TODO: Should we allow vector elements?
9618 if (!CurrentType->isDependentType()) {
9619 const ArrayType *AT = Context.getAsArrayType(CurrentType);
9620 if(!AT)
9621 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type)
9622 << CurrentType);
9623 CurrentType = AT->getElementType();
9624 } else
9625 CurrentType = Context.DependentTy;
9626
9627 // The expression must be an integral expression.
9628 // FIXME: An integral constant expression?
9629 Expr *Idx = static_cast<Expr*>(OC.U.E);
9630 if (!Idx->isTypeDependent() && !Idx->isValueDependent() &&
9631 !Idx->getType()->isIntegerType())
9632 return ExprError(Diag(Idx->getLocStart(),
9633 diag::err_typecheck_subscript_not_integer)
9634 << Idx->getSourceRange());
9635
9636 // Record this array index.
9637 Comps.push_back(OffsetOfNode(OC.LocStart, Exprs.size(), OC.LocEnd));
9638 Exprs.push_back(Idx);
9639 continue;
9640 }
9641
9642 // Offset of a field.
9643 if (CurrentType->isDependentType()) {
9644 // We have the offset of a field, but we can't look into the dependent
9645 // type. Just record the identifier of the field.
9646 Comps.push_back(OffsetOfNode(OC.LocStart, OC.U.IdentInfo, OC.LocEnd));
9647 CurrentType = Context.DependentTy;
9648 continue;
9649 }
9650
9651 // We need to have a complete type to look into.
9652 if (RequireCompleteType(OC.LocStart, CurrentType,
9653 diag::err_offsetof_incomplete_type))
9654 return ExprError();
9655
9656 // Look for the designated field.
9657 const RecordType *RC = CurrentType->getAs<RecordType>();
9658 if (!RC)
9659 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type)
9660 << CurrentType);
9661 RecordDecl *RD = RC->getDecl();
9662
9663 // C++ [lib.support.types]p5:
9664 // The macro offsetof accepts a restricted set of type arguments in this
9665 // International Standard. type shall be a POD structure or a POD union
9666 // (clause 9).
9667 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
9668 if (!CRD->isPOD() && !DidWarnAboutNonPOD &&
Ted Kremenek762696f2011-02-23 01:51:43 +00009669 DiagRuntimeBehavior(BuiltinLoc, 0,
Douglas Gregor8ecdb652010-04-28 22:16:22 +00009670 PDiag(diag::warn_offsetof_non_pod_type)
9671 << SourceRange(CompPtr[0].LocStart, OC.LocEnd)
9672 << CurrentType))
9673 DidWarnAboutNonPOD = true;
9674 }
9675
9676 // Look for the field.
9677 LookupResult R(*this, OC.U.IdentInfo, OC.LocStart, LookupMemberName);
9678 LookupQualifiedName(R, RD);
9679 FieldDecl *MemberDecl = R.getAsSingle<FieldDecl>();
Francois Pichet87c2e122010-11-21 06:08:52 +00009680 IndirectFieldDecl *IndirectMemberDecl = 0;
9681 if (!MemberDecl) {
Benjamin Kramerd9811462010-11-21 14:11:41 +00009682 if ((IndirectMemberDecl = R.getAsSingle<IndirectFieldDecl>()))
Francois Pichet87c2e122010-11-21 06:08:52 +00009683 MemberDecl = IndirectMemberDecl->getAnonField();
9684 }
9685
Douglas Gregor8ecdb652010-04-28 22:16:22 +00009686 if (!MemberDecl)
9687 return ExprError(Diag(BuiltinLoc, diag::err_no_member)
9688 << OC.U.IdentInfo << RD << SourceRange(OC.LocStart,
9689 OC.LocEnd));
9690
Douglas Gregor9d5d60f2010-04-28 22:36:06 +00009691 // C99 7.17p3:
9692 // (If the specified member is a bit-field, the behavior is undefined.)
9693 //
9694 // We diagnose this as an error.
9695 if (MemberDecl->getBitWidth()) {
9696 Diag(OC.LocEnd, diag::err_offsetof_bitfield)
9697 << MemberDecl->getDeclName()
9698 << SourceRange(BuiltinLoc, RParenLoc);
9699 Diag(MemberDecl->getLocation(), diag::note_bitfield_decl);
9700 return ExprError();
9701 }
Eli Friedman19410a72010-08-05 10:11:36 +00009702
9703 RecordDecl *Parent = MemberDecl->getParent();
Francois Pichet87c2e122010-11-21 06:08:52 +00009704 if (IndirectMemberDecl)
9705 Parent = cast<RecordDecl>(IndirectMemberDecl->getDeclContext());
Eli Friedman19410a72010-08-05 10:11:36 +00009706
Douglas Gregorcc8a5d52010-04-29 00:18:15 +00009707 // If the member was found in a base class, introduce OffsetOfNodes for
9708 // the base class indirections.
9709 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
9710 /*DetectVirtual=*/false);
Eli Friedman19410a72010-08-05 10:11:36 +00009711 if (IsDerivedFrom(CurrentType, Context.getTypeDeclType(Parent), Paths)) {
Douglas Gregorcc8a5d52010-04-29 00:18:15 +00009712 CXXBasePath &Path = Paths.front();
9713 for (CXXBasePath::iterator B = Path.begin(), BEnd = Path.end();
9714 B != BEnd; ++B)
9715 Comps.push_back(OffsetOfNode(B->Base));
9716 }
Eli Friedman19410a72010-08-05 10:11:36 +00009717
Francois Pichet87c2e122010-11-21 06:08:52 +00009718 if (IndirectMemberDecl) {
9719 for (IndirectFieldDecl::chain_iterator FI =
9720 IndirectMemberDecl->chain_begin(),
9721 FEnd = IndirectMemberDecl->chain_end(); FI != FEnd; FI++) {
9722 assert(isa<FieldDecl>(*FI));
9723 Comps.push_back(OffsetOfNode(OC.LocStart,
9724 cast<FieldDecl>(*FI), OC.LocEnd));
9725 }
9726 } else
Douglas Gregor8ecdb652010-04-28 22:16:22 +00009727 Comps.push_back(OffsetOfNode(OC.LocStart, MemberDecl, OC.LocEnd));
Francois Pichet87c2e122010-11-21 06:08:52 +00009728
Douglas Gregor8ecdb652010-04-28 22:16:22 +00009729 CurrentType = MemberDecl->getType().getNonReferenceType();
9730 }
9731
9732 return Owned(OffsetOfExpr::Create(Context, Context.getSizeType(), BuiltinLoc,
9733 TInfo, Comps.data(), Comps.size(),
9734 Exprs.data(), Exprs.size(), RParenLoc));
9735}
Mike Stumpeed9cac2009-02-19 03:04:26 +00009736
John McCall60d7b3a2010-08-24 06:29:42 +00009737ExprResult Sema::ActOnBuiltinOffsetOf(Scope *S,
John McCall2cd11fe2010-10-12 02:09:17 +00009738 SourceLocation BuiltinLoc,
9739 SourceLocation TypeLoc,
9740 ParsedType argty,
9741 OffsetOfComponent *CompPtr,
9742 unsigned NumComponents,
9743 SourceLocation RPLoc) {
9744
Douglas Gregor8ecdb652010-04-28 22:16:22 +00009745 TypeSourceInfo *ArgTInfo;
9746 QualType ArgTy = GetTypeFromParser(argty, &ArgTInfo);
9747 if (ArgTy.isNull())
9748 return ExprError();
9749
Eli Friedman5a15dc12010-08-05 10:15:45 +00009750 if (!ArgTInfo)
9751 ArgTInfo = Context.getTrivialTypeSourceInfo(ArgTy, TypeLoc);
9752
9753 return BuildBuiltinOffsetOf(BuiltinLoc, ArgTInfo, CompPtr, NumComponents,
9754 RPLoc);
Chris Lattner73d0d4f2007-08-30 17:45:32 +00009755}
9756
9757
John McCall60d7b3a2010-08-24 06:29:42 +00009758ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc,
John McCall2cd11fe2010-10-12 02:09:17 +00009759 Expr *CondExpr,
9760 Expr *LHSExpr, Expr *RHSExpr,
9761 SourceLocation RPLoc) {
Steve Naroffd04fdd52007-08-03 21:21:27 +00009762 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)");
9763
John McCallf89e55a2010-11-18 06:31:45 +00009764 ExprValueKind VK = VK_RValue;
9765 ExprObjectKind OK = OK_Ordinary;
Sebastian Redl28507842009-02-26 14:39:58 +00009766 QualType resType;
Douglas Gregorce940492009-09-25 04:25:58 +00009767 bool ValueDependent = false;
Douglas Gregorc9ecc572009-05-19 22:43:30 +00009768 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) {
Sebastian Redl28507842009-02-26 14:39:58 +00009769 resType = Context.DependentTy;
Douglas Gregorce940492009-09-25 04:25:58 +00009770 ValueDependent = true;
Sebastian Redl28507842009-02-26 14:39:58 +00009771 } else {
9772 // The conditional expression is required to be a constant expression.
9773 llvm::APSInt condEval(32);
9774 SourceLocation ExpLoc;
9775 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc))
Sebastian Redlf53597f2009-03-15 17:47:39 +00009776 return ExprError(Diag(ExpLoc,
9777 diag::err_typecheck_choose_expr_requires_constant)
9778 << CondExpr->getSourceRange());
Steve Naroffd04fdd52007-08-03 21:21:27 +00009779
Sebastian Redl28507842009-02-26 14:39:58 +00009780 // If the condition is > zero, then the AST type is the same as the LSHExpr.
John McCallf89e55a2010-11-18 06:31:45 +00009781 Expr *ActiveExpr = condEval.getZExtValue() ? LHSExpr : RHSExpr;
9782
9783 resType = ActiveExpr->getType();
9784 ValueDependent = ActiveExpr->isValueDependent();
9785 VK = ActiveExpr->getValueKind();
9786 OK = ActiveExpr->getObjectKind();
Sebastian Redl28507842009-02-26 14:39:58 +00009787 }
9788
Sebastian Redlf53597f2009-03-15 17:47:39 +00009789 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr,
John McCallf89e55a2010-11-18 06:31:45 +00009790 resType, VK, OK, RPLoc,
Douglas Gregorce940492009-09-25 04:25:58 +00009791 resType->isDependentType(),
9792 ValueDependent));
Steve Naroffd04fdd52007-08-03 21:21:27 +00009793}
9794
Steve Naroff4eb206b2008-09-03 18:15:37 +00009795//===----------------------------------------------------------------------===//
9796// Clang Extensions.
9797//===----------------------------------------------------------------------===//
9798
9799/// ActOnBlockStart - This callback is invoked when a block literal is started.
Steve Naroff090276f2008-10-10 01:28:17 +00009800void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) {
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00009801 BlockDecl *Block = BlockDecl::Create(Context, CurContext, CaretLoc);
9802 PushBlockScope(BlockScope, Block);
9803 CurContext->addDecl(Block);
Fariborz Jahaniana729da22010-07-09 18:44:02 +00009804 if (BlockScope)
9805 PushDeclContext(BlockScope, Block);
9806 else
9807 CurContext = Block;
Steve Naroff090276f2008-10-10 01:28:17 +00009808}
9809
Mike Stump98eb8a72009-02-04 22:31:32 +00009810void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) {
Mike Stumpaf199f32009-05-07 18:43:07 +00009811 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!");
John McCall711c52b2011-01-05 12:14:39 +00009812 assert(ParamInfo.getContext() == Declarator::BlockLiteralContext);
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00009813 BlockScopeInfo *CurBlock = getCurBlock();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009814
John McCallbf1a0282010-06-04 23:28:52 +00009815 TypeSourceInfo *Sig = GetTypeForDeclarator(ParamInfo, CurScope);
John McCallbf1a0282010-06-04 23:28:52 +00009816 QualType T = Sig->getType();
Mike Stump98eb8a72009-02-04 22:31:32 +00009817
John McCall711c52b2011-01-05 12:14:39 +00009818 // GetTypeForDeclarator always produces a function type for a block
9819 // literal signature. Furthermore, it is always a FunctionProtoType
9820 // unless the function was written with a typedef.
9821 assert(T->isFunctionType() &&
9822 "GetTypeForDeclarator made a non-function block signature");
9823
9824 // Look for an explicit signature in that function type.
9825 FunctionProtoTypeLoc ExplicitSignature;
9826
9827 TypeLoc tmp = Sig->getTypeLoc().IgnoreParens();
9828 if (isa<FunctionProtoTypeLoc>(tmp)) {
9829 ExplicitSignature = cast<FunctionProtoTypeLoc>(tmp);
9830
9831 // Check whether that explicit signature was synthesized by
9832 // GetTypeForDeclarator. If so, don't save that as part of the
9833 // written signature.
Abramo Bagnara796aa442011-03-12 11:17:06 +00009834 if (ExplicitSignature.getLocalRangeBegin() ==
9835 ExplicitSignature.getLocalRangeEnd()) {
John McCall711c52b2011-01-05 12:14:39 +00009836 // This would be much cheaper if we stored TypeLocs instead of
9837 // TypeSourceInfos.
9838 TypeLoc Result = ExplicitSignature.getResultLoc();
9839 unsigned Size = Result.getFullDataSize();
9840 Sig = Context.CreateTypeSourceInfo(Result.getType(), Size);
9841 Sig->getTypeLoc().initializeFullCopy(Result, Size);
9842
9843 ExplicitSignature = FunctionProtoTypeLoc();
9844 }
John McCall82dc0092010-06-04 11:21:44 +00009845 }
Mike Stump1eb44332009-09-09 15:08:12 +00009846
John McCall711c52b2011-01-05 12:14:39 +00009847 CurBlock->TheDecl->setSignatureAsWritten(Sig);
9848 CurBlock->FunctionType = T;
9849
9850 const FunctionType *Fn = T->getAs<FunctionType>();
9851 QualType RetTy = Fn->getResultType();
9852 bool isVariadic =
9853 (isa<FunctionProtoType>(Fn) && cast<FunctionProtoType>(Fn)->isVariadic());
9854
John McCallc71a4912010-06-04 19:02:56 +00009855 CurBlock->TheDecl->setIsVariadic(isVariadic);
Douglas Gregora873dfc2010-02-03 00:27:59 +00009856
John McCall82dc0092010-06-04 11:21:44 +00009857 // Don't allow returning a objc interface by value.
9858 if (RetTy->isObjCObjectType()) {
9859 Diag(ParamInfo.getSourceRange().getBegin(),
9860 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy;
9861 return;
9862 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00009863
John McCall82dc0092010-06-04 11:21:44 +00009864 // Context.DependentTy is used as a placeholder for a missing block
John McCallc71a4912010-06-04 19:02:56 +00009865 // return type. TODO: what should we do with declarators like:
9866 // ^ * { ... }
9867 // If the answer is "apply template argument deduction"....
John McCall82dc0092010-06-04 11:21:44 +00009868 if (RetTy != Context.DependentTy)
9869 CurBlock->ReturnType = RetTy;
Mike Stumpeed9cac2009-02-19 03:04:26 +00009870
John McCall82dc0092010-06-04 11:21:44 +00009871 // Push block parameters from the declarator if we had them.
John McCallc71a4912010-06-04 19:02:56 +00009872 llvm::SmallVector<ParmVarDecl*, 8> Params;
John McCall711c52b2011-01-05 12:14:39 +00009873 if (ExplicitSignature) {
9874 for (unsigned I = 0, E = ExplicitSignature.getNumArgs(); I != E; ++I) {
9875 ParmVarDecl *Param = ExplicitSignature.getArg(I);
Fariborz Jahanian9a66c302010-02-12 21:53:14 +00009876 if (Param->getIdentifier() == 0 &&
9877 !Param->isImplicit() &&
9878 !Param->isInvalidDecl() &&
9879 !getLangOptions().CPlusPlus)
9880 Diag(Param->getLocation(), diag::err_parameter_name_omitted);
John McCallc71a4912010-06-04 19:02:56 +00009881 Params.push_back(Param);
Fariborz Jahanian9a66c302010-02-12 21:53:14 +00009882 }
John McCall82dc0092010-06-04 11:21:44 +00009883
9884 // Fake up parameter variables if we have a typedef, like
9885 // ^ fntype { ... }
9886 } else if (const FunctionProtoType *Fn = T->getAs<FunctionProtoType>()) {
9887 for (FunctionProtoType::arg_type_iterator
9888 I = Fn->arg_type_begin(), E = Fn->arg_type_end(); I != E; ++I) {
9889 ParmVarDecl *Param =
9890 BuildParmVarDeclForTypedef(CurBlock->TheDecl,
9891 ParamInfo.getSourceRange().getBegin(),
9892 *I);
John McCallc71a4912010-06-04 19:02:56 +00009893 Params.push_back(Param);
John McCall82dc0092010-06-04 11:21:44 +00009894 }
Steve Naroff4eb206b2008-09-03 18:15:37 +00009895 }
John McCall82dc0092010-06-04 11:21:44 +00009896
John McCallc71a4912010-06-04 19:02:56 +00009897 // Set the parameters on the block decl.
Douglas Gregor82aa7132010-11-01 18:37:59 +00009898 if (!Params.empty()) {
John McCallc71a4912010-06-04 19:02:56 +00009899 CurBlock->TheDecl->setParams(Params.data(), Params.size());
Douglas Gregor82aa7132010-11-01 18:37:59 +00009900 CheckParmsForFunctionDef(CurBlock->TheDecl->param_begin(),
9901 CurBlock->TheDecl->param_end(),
9902 /*CheckParameterNames=*/false);
9903 }
9904
John McCall82dc0092010-06-04 11:21:44 +00009905 // Finally we can process decl attributes.
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00009906 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo);
John McCall053f4bd2010-03-22 09:20:08 +00009907
John McCallc71a4912010-06-04 19:02:56 +00009908 if (!isVariadic && CurBlock->TheDecl->getAttr<SentinelAttr>()) {
John McCall82dc0092010-06-04 11:21:44 +00009909 Diag(ParamInfo.getAttributes()->getLoc(),
9910 diag::warn_attribute_sentinel_not_variadic) << 1;
9911 // FIXME: remove the attribute.
9912 }
9913
9914 // Put the parameter variables in scope. We can bail out immediately
9915 // if we don't have any.
John McCallc71a4912010-06-04 19:02:56 +00009916 if (Params.empty())
John McCall82dc0092010-06-04 11:21:44 +00009917 return;
9918
Steve Naroff090276f2008-10-10 01:28:17 +00009919 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(),
John McCall7a9813c2010-01-22 00:28:27 +00009920 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) {
9921 (*AI)->setOwningFunction(CurBlock->TheDecl);
9922
Steve Naroff090276f2008-10-10 01:28:17 +00009923 // If this has an identifier, add it to the scope stack.
John McCall053f4bd2010-03-22 09:20:08 +00009924 if ((*AI)->getIdentifier()) {
Argyrios Kyrtzidis08274082010-12-15 18:44:22 +00009925 CheckShadow(CurBlock->TheScope, *AI);
John McCall053f4bd2010-03-22 09:20:08 +00009926
Steve Naroff090276f2008-10-10 01:28:17 +00009927 PushOnScopeChains(*AI, CurBlock->TheScope);
John McCall053f4bd2010-03-22 09:20:08 +00009928 }
John McCall7a9813c2010-01-22 00:28:27 +00009929 }
Steve Naroff4eb206b2008-09-03 18:15:37 +00009930}
9931
9932/// ActOnBlockError - If there is an error parsing a block, this callback
9933/// is invoked to pop the information about the block from the action impl.
9934void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) {
Steve Naroff4eb206b2008-09-03 18:15:37 +00009935 // Pop off CurBlock, handle nested blocks.
Chris Lattner5c59e2b2009-04-21 22:38:46 +00009936 PopDeclContext();
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00009937 PopFunctionOrBlockScope();
Steve Naroff4eb206b2008-09-03 18:15:37 +00009938}
9939
9940/// ActOnBlockStmtExpr - This is called when the body of a block statement
9941/// literal was successfully completed. ^(int x){...}
John McCall60d7b3a2010-08-24 06:29:42 +00009942ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc,
Chris Lattnere476bdc2011-02-17 23:58:47 +00009943 Stmt *Body, Scope *CurScope) {
Chris Lattner9af55002009-03-27 04:18:06 +00009944 // If blocks are disabled, emit an error.
9945 if (!LangOpts.Blocks)
9946 Diag(CaretLoc, diag::err_blocks_disable);
Mike Stump1eb44332009-09-09 15:08:12 +00009947
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00009948 BlockScopeInfo *BSI = cast<BlockScopeInfo>(FunctionScopes.back());
Fariborz Jahaniana729da22010-07-09 18:44:02 +00009949
Steve Naroff090276f2008-10-10 01:28:17 +00009950 PopDeclContext();
9951
Steve Naroff4eb206b2008-09-03 18:15:37 +00009952 QualType RetTy = Context.VoidTy;
Fariborz Jahanian7d5c74e2009-06-19 23:37:08 +00009953 if (!BSI->ReturnType.isNull())
9954 RetTy = BSI->ReturnType;
Mike Stumpeed9cac2009-02-19 03:04:26 +00009955
Mike Stump56925862009-07-28 22:04:01 +00009956 bool NoReturn = BSI->TheDecl->getAttr<NoReturnAttr>();
Steve Naroff4eb206b2008-09-03 18:15:37 +00009957 QualType BlockTy;
John McCallc71a4912010-06-04 19:02:56 +00009958
John McCall469a1eb2011-02-02 13:00:07 +00009959 // Set the captured variables on the block.
John McCall6b5a61b2011-02-07 10:33:21 +00009960 BSI->TheDecl->setCaptures(Context, BSI->Captures.begin(), BSI->Captures.end(),
9961 BSI->CapturesCXXThis);
John McCall469a1eb2011-02-02 13:00:07 +00009962
John McCallc71a4912010-06-04 19:02:56 +00009963 // If the user wrote a function type in some form, try to use that.
9964 if (!BSI->FunctionType.isNull()) {
9965 const FunctionType *FTy = BSI->FunctionType->getAs<FunctionType>();
9966
9967 FunctionType::ExtInfo Ext = FTy->getExtInfo();
9968 if (NoReturn && !Ext.getNoReturn()) Ext = Ext.withNoReturn(true);
9969
9970 // Turn protoless block types into nullary block types.
9971 if (isa<FunctionNoProtoType>(FTy)) {
John McCalle23cf432010-12-14 08:05:40 +00009972 FunctionProtoType::ExtProtoInfo EPI;
9973 EPI.ExtInfo = Ext;
9974 BlockTy = Context.getFunctionType(RetTy, 0, 0, EPI);
John McCallc71a4912010-06-04 19:02:56 +00009975
9976 // Otherwise, if we don't need to change anything about the function type,
9977 // preserve its sugar structure.
9978 } else if (FTy->getResultType() == RetTy &&
9979 (!NoReturn || FTy->getNoReturnAttr())) {
9980 BlockTy = BSI->FunctionType;
9981
9982 // Otherwise, make the minimal modifications to the function type.
9983 } else {
9984 const FunctionProtoType *FPT = cast<FunctionProtoType>(FTy);
John McCalle23cf432010-12-14 08:05:40 +00009985 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
9986 EPI.TypeQuals = 0; // FIXME: silently?
9987 EPI.ExtInfo = Ext;
John McCallc71a4912010-06-04 19:02:56 +00009988 BlockTy = Context.getFunctionType(RetTy,
9989 FPT->arg_type_begin(),
9990 FPT->getNumArgs(),
John McCalle23cf432010-12-14 08:05:40 +00009991 EPI);
John McCallc71a4912010-06-04 19:02:56 +00009992 }
9993
9994 // If we don't have a function type, just build one from nothing.
9995 } else {
John McCalle23cf432010-12-14 08:05:40 +00009996 FunctionProtoType::ExtProtoInfo EPI;
John McCallf85e1932011-06-15 23:02:42 +00009997 EPI.ExtInfo = FunctionType::ExtInfo().withNoReturn(NoReturn);
John McCalle23cf432010-12-14 08:05:40 +00009998 BlockTy = Context.getFunctionType(RetTy, 0, 0, EPI);
John McCallc71a4912010-06-04 19:02:56 +00009999 }
Mike Stumpeed9cac2009-02-19 03:04:26 +000010000
John McCallc71a4912010-06-04 19:02:56 +000010001 DiagnoseUnusedParameters(BSI->TheDecl->param_begin(),
10002 BSI->TheDecl->param_end());
Steve Naroff4eb206b2008-09-03 18:15:37 +000010003 BlockTy = Context.getBlockPointerType(BlockTy);
Mike Stumpeed9cac2009-02-19 03:04:26 +000010004
Chris Lattner17a78302009-04-19 05:28:12 +000010005 // If needed, diagnose invalid gotos and switches in the block.
John McCallf85e1932011-06-15 23:02:42 +000010006 if (getCurFunction()->NeedsScopeChecking() &&
10007 !hasAnyUnrecoverableErrorsInThisFunction())
John McCall9ae2f072010-08-23 23:25:46 +000010008 DiagnoseInvalidJumps(cast<CompoundStmt>(Body));
Mike Stump1eb44332009-09-09 15:08:12 +000010009
Chris Lattnere476bdc2011-02-17 23:58:47 +000010010 BSI->TheDecl->setBody(cast<CompoundStmt>(Body));
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010011
John McCall469a1eb2011-02-02 13:00:07 +000010012 BlockExpr *Result = new (Context) BlockExpr(BSI->TheDecl, BlockTy);
John McCalle0054f62010-08-25 05:56:39 +000010013
Ted Kremenek3ed6fc02011-02-23 01:51:48 +000010014 const AnalysisBasedWarnings::Policy &WP = AnalysisWarnings.getDefaultPolicy();
10015 PopFunctionOrBlockScope(&WP, Result->getBlockDecl(), Result);
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +000010016 return Owned(Result);
Steve Naroff4eb206b2008-09-03 18:15:37 +000010017}
10018
John McCall60d7b3a2010-08-24 06:29:42 +000010019ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc,
John McCallb3d87482010-08-24 05:47:05 +000010020 Expr *expr, ParsedType type,
Sebastian Redlf53597f2009-03-15 17:47:39 +000010021 SourceLocation RPLoc) {
Abramo Bagnara2cad9002010-08-10 10:06:15 +000010022 TypeSourceInfo *TInfo;
Jeffrey Yasskindec09842011-01-18 02:00:16 +000010023 GetTypeFromParser(type, &TInfo);
John McCall9ae2f072010-08-23 23:25:46 +000010024 return BuildVAArgExpr(BuiltinLoc, expr, TInfo, RPLoc);
Abramo Bagnara2cad9002010-08-10 10:06:15 +000010025}
10026
John McCall60d7b3a2010-08-24 06:29:42 +000010027ExprResult Sema::BuildVAArgExpr(SourceLocation BuiltinLoc,
John McCallf89e55a2010-11-18 06:31:45 +000010028 Expr *E, TypeSourceInfo *TInfo,
10029 SourceLocation RPLoc) {
Chris Lattner0d20b8a2009-04-05 15:49:53 +000010030 Expr *OrigExpr = E;
Mike Stump1eb44332009-09-09 15:08:12 +000010031
Eli Friedmanc34bcde2008-08-09 23:32:40 +000010032 // Get the va_list type
10033 QualType VaListType = Context.getBuiltinVaListType();
Eli Friedman5c091ba2009-05-16 12:46:54 +000010034 if (VaListType->isArrayType()) {
10035 // Deal with implicit array decay; for example, on x86-64,
10036 // va_list is an array, but it's supposed to decay to
10037 // a pointer for va_arg.
Eli Friedmanc34bcde2008-08-09 23:32:40 +000010038 VaListType = Context.getArrayDecayedType(VaListType);
Eli Friedman5c091ba2009-05-16 12:46:54 +000010039 // Make sure the input expression also decays appropriately.
John Wiegley429bb272011-04-08 18:41:53 +000010040 ExprResult Result = UsualUnaryConversions(E);
10041 if (Result.isInvalid())
10042 return ExprError();
10043 E = Result.take();
Eli Friedman5c091ba2009-05-16 12:46:54 +000010044 } else {
10045 // Otherwise, the va_list argument must be an l-value because
10046 // it is modified by va_arg.
Mike Stump1eb44332009-09-09 15:08:12 +000010047 if (!E->isTypeDependent() &&
Douglas Gregordd027302009-05-19 23:10:31 +000010048 CheckForModifiableLvalue(E, BuiltinLoc, *this))
Eli Friedman5c091ba2009-05-16 12:46:54 +000010049 return ExprError();
10050 }
Eli Friedmanc34bcde2008-08-09 23:32:40 +000010051
Douglas Gregordd027302009-05-19 23:10:31 +000010052 if (!E->isTypeDependent() &&
10053 !Context.hasSameType(VaListType, E->getType())) {
Sebastian Redlf53597f2009-03-15 17:47:39 +000010054 return ExprError(Diag(E->getLocStart(),
10055 diag::err_first_argument_to_va_arg_not_of_type_va_list)
Chris Lattner0d20b8a2009-04-05 15:49:53 +000010056 << OrigExpr->getType() << E->getSourceRange());
Chris Lattner9dc8f192009-04-05 00:59:53 +000010057 }
Mike Stumpeed9cac2009-02-19 03:04:26 +000010058
David Majnemer0adde122011-06-14 05:17:32 +000010059 if (!TInfo->getType()->isDependentType()) {
10060 if (RequireCompleteType(TInfo->getTypeLoc().getBeginLoc(), TInfo->getType(),
10061 PDiag(diag::err_second_parameter_to_va_arg_incomplete)
10062 << TInfo->getTypeLoc().getSourceRange()))
10063 return ExprError();
David Majnemerdb11b012011-06-13 06:37:03 +000010064
David Majnemer0adde122011-06-14 05:17:32 +000010065 if (RequireNonAbstractType(TInfo->getTypeLoc().getBeginLoc(),
10066 TInfo->getType(),
10067 PDiag(diag::err_second_parameter_to_va_arg_abstract)
10068 << TInfo->getTypeLoc().getSourceRange()))
10069 return ExprError();
10070
John McCallf85e1932011-06-15 23:02:42 +000010071 if (!TInfo->getType().isPODType(Context))
David Majnemer0adde122011-06-14 05:17:32 +000010072 Diag(TInfo->getTypeLoc().getBeginLoc(),
10073 diag::warn_second_parameter_to_va_arg_not_pod)
10074 << TInfo->getType()
10075 << TInfo->getTypeLoc().getSourceRange();
10076 }
Mike Stumpeed9cac2009-02-19 03:04:26 +000010077
Abramo Bagnara2cad9002010-08-10 10:06:15 +000010078 QualType T = TInfo->getType().getNonLValueExprType(Context);
10079 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, TInfo, RPLoc, T));
Anders Carlsson7c50aca2007-10-15 20:28:48 +000010080}
10081
John McCall60d7b3a2010-08-24 06:29:42 +000010082ExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) {
Douglas Gregor2d8b2732008-11-29 04:51:27 +000010083 // The type of __null will be int or long, depending on the size of
10084 // pointers on the target.
10085 QualType Ty;
NAKAMURA Takumi6e5658d2011-01-19 00:11:41 +000010086 unsigned pw = Context.Target.getPointerWidth(0);
10087 if (pw == Context.Target.getIntWidth())
Douglas Gregor2d8b2732008-11-29 04:51:27 +000010088 Ty = Context.IntTy;
NAKAMURA Takumi6e5658d2011-01-19 00:11:41 +000010089 else if (pw == Context.Target.getLongWidth())
Douglas Gregor2d8b2732008-11-29 04:51:27 +000010090 Ty = Context.LongTy;
NAKAMURA Takumi6e5658d2011-01-19 00:11:41 +000010091 else if (pw == Context.Target.getLongLongWidth())
10092 Ty = Context.LongLongTy;
10093 else {
10094 assert(!"I don't know size of pointer!");
10095 Ty = Context.IntTy;
10096 }
Douglas Gregor2d8b2732008-11-29 04:51:27 +000010097
Sebastian Redlf53597f2009-03-15 17:47:39 +000010098 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc));
Douglas Gregor2d8b2732008-11-29 04:51:27 +000010099}
10100
Sean Hunt1e3f5ba2010-04-28 23:02:27 +000010101static void MakeObjCStringLiteralFixItHint(Sema& SemaRef, QualType DstType,
Douglas Gregor849b2432010-03-31 17:46:05 +000010102 Expr *SrcExpr, FixItHint &Hint) {
Anders Carlssonb76cd3d2009-11-10 04:46:30 +000010103 if (!SemaRef.getLangOptions().ObjC1)
10104 return;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010105
Anders Carlssonb76cd3d2009-11-10 04:46:30 +000010106 const ObjCObjectPointerType *PT = DstType->getAs<ObjCObjectPointerType>();
10107 if (!PT)
10108 return;
10109
10110 // Check if the destination is of type 'id'.
10111 if (!PT->isObjCIdType()) {
10112 // Check if the destination is the 'NSString' interface.
10113 const ObjCInterfaceDecl *ID = PT->getInterfaceDecl();
10114 if (!ID || !ID->getIdentifier()->isStr("NSString"))
10115 return;
10116 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010117
Anders Carlssonb76cd3d2009-11-10 04:46:30 +000010118 // Strip off any parens and casts.
10119 StringLiteral *SL = dyn_cast<StringLiteral>(SrcExpr->IgnoreParenCasts());
10120 if (!SL || SL->isWide())
10121 return;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010122
Douglas Gregor849b2432010-03-31 17:46:05 +000010123 Hint = FixItHint::CreateInsertion(SL->getLocStart(), "@");
Anders Carlssonb76cd3d2009-11-10 04:46:30 +000010124}
10125
Chris Lattner5cf216b2008-01-04 18:04:52 +000010126bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy,
10127 SourceLocation Loc,
10128 QualType DstType, QualType SrcType,
Douglas Gregora41a8c52010-04-22 00:20:18 +000010129 Expr *SrcExpr, AssignmentAction Action,
10130 bool *Complained) {
10131 if (Complained)
10132 *Complained = false;
10133
Chris Lattner5cf216b2008-01-04 18:04:52 +000010134 // Decode the result (notice that AST's are still created for extensions).
Douglas Gregor926df6c2011-06-11 01:09:30 +000010135 bool CheckInferredResultType = false;
Chris Lattner5cf216b2008-01-04 18:04:52 +000010136 bool isInvalid = false;
10137 unsigned DiagKind;
Douglas Gregor849b2432010-03-31 17:46:05 +000010138 FixItHint Hint;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010139
Chris Lattner5cf216b2008-01-04 18:04:52 +000010140 switch (ConvTy) {
10141 default: assert(0 && "Unknown conversion type");
10142 case Compatible: return false;
Chris Lattnerb7b61152008-01-04 18:22:42 +000010143 case PointerToInt:
Chris Lattner5cf216b2008-01-04 18:04:52 +000010144 DiagKind = diag::ext_typecheck_convert_pointer_int;
10145 break;
Chris Lattnerb7b61152008-01-04 18:22:42 +000010146 case IntToPointer:
10147 DiagKind = diag::ext_typecheck_convert_int_pointer;
10148 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +000010149 case IncompatiblePointer:
Douglas Gregor849b2432010-03-31 17:46:05 +000010150 MakeObjCStringLiteralFixItHint(*this, DstType, SrcExpr, Hint);
Chris Lattner5cf216b2008-01-04 18:04:52 +000010151 DiagKind = diag::ext_typecheck_convert_incompatible_pointer;
Douglas Gregor926df6c2011-06-11 01:09:30 +000010152 CheckInferredResultType = DstType->isObjCObjectPointerType() &&
10153 SrcType->isObjCObjectPointerType();
Chris Lattner5cf216b2008-01-04 18:04:52 +000010154 break;
Eli Friedmanf05c05d2009-03-22 23:59:44 +000010155 case IncompatiblePointerSign:
10156 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign;
10157 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +000010158 case FunctionVoidPointer:
10159 DiagKind = diag::ext_typecheck_convert_pointer_void_func;
10160 break;
John McCall86c05f32011-02-01 00:10:29 +000010161 case IncompatiblePointerDiscardsQualifiers: {
John McCall40249e72011-02-01 23:28:01 +000010162 // Perform array-to-pointer decay if necessary.
10163 if (SrcType->isArrayType()) SrcType = Context.getArrayDecayedType(SrcType);
10164
John McCall86c05f32011-02-01 00:10:29 +000010165 Qualifiers lhq = SrcType->getPointeeType().getQualifiers();
10166 Qualifiers rhq = DstType->getPointeeType().getQualifiers();
10167 if (lhq.getAddressSpace() != rhq.getAddressSpace()) {
10168 DiagKind = diag::err_typecheck_incompatible_address_space;
10169 break;
John McCallf85e1932011-06-15 23:02:42 +000010170
10171
10172 } else if (lhq.getObjCLifetime() != rhq.getObjCLifetime()) {
10173 DiagKind = diag::err_typecheck_incompatible_lifetime;
10174 break;
John McCall86c05f32011-02-01 00:10:29 +000010175 }
10176
10177 llvm_unreachable("unknown error case for discarding qualifiers!");
10178 // fallthrough
10179 }
Chris Lattner5cf216b2008-01-04 18:04:52 +000010180 case CompatiblePointerDiscardsQualifiers:
Douglas Gregor77a52232008-09-12 00:47:35 +000010181 // If the qualifiers lost were because we were applying the
10182 // (deprecated) C++ conversion from a string literal to a char*
10183 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME:
10184 // Ideally, this check would be performed in
John McCalle4be87e2011-01-31 23:13:11 +000010185 // checkPointerTypesForAssignment. However, that would require a
Douglas Gregor77a52232008-09-12 00:47:35 +000010186 // bit of refactoring (so that the second argument is an
10187 // expression, rather than a type), which should be done as part
John McCalle4be87e2011-01-31 23:13:11 +000010188 // of a larger effort to fix checkPointerTypesForAssignment for
Douglas Gregor77a52232008-09-12 00:47:35 +000010189 // C++ semantics.
10190 if (getLangOptions().CPlusPlus &&
10191 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType))
10192 return false;
Chris Lattner5cf216b2008-01-04 18:04:52 +000010193 DiagKind = diag::ext_typecheck_convert_discards_qualifiers;
10194 break;
Sean Huntc9132b62009-11-08 07:46:34 +000010195 case IncompatibleNestedPointerQualifiers:
Fariborz Jahanian3451e922009-11-09 22:16:37 +000010196 DiagKind = diag::ext_nested_pointer_qualifier_mismatch;
Fariborz Jahanian36a862f2009-11-07 20:20:40 +000010197 break;
Steve Naroff1c7d0672008-09-04 15:10:53 +000010198 case IntToBlockPointer:
10199 DiagKind = diag::err_int_to_block_pointer;
10200 break;
10201 case IncompatibleBlockPointer:
Mike Stump25efa102009-04-21 22:51:42 +000010202 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer;
Steve Naroff1c7d0672008-09-04 15:10:53 +000010203 break;
Steve Naroff39579072008-10-14 22:18:38 +000010204 case IncompatibleObjCQualifiedId:
Mike Stumpeed9cac2009-02-19 03:04:26 +000010205 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since
Steve Naroff39579072008-10-14 22:18:38 +000010206 // it can give a more specific diagnostic.
10207 DiagKind = diag::warn_incompatible_qualified_id;
10208 break;
Anders Carlssonb0f90cc2009-01-30 23:17:46 +000010209 case IncompatibleVectors:
10210 DiagKind = diag::warn_incompatible_vectors;
10211 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +000010212 case Incompatible:
10213 DiagKind = diag::err_typecheck_convert_incompatible;
10214 isInvalid = true;
10215 break;
10216 }
Mike Stumpeed9cac2009-02-19 03:04:26 +000010217
Douglas Gregord4eea832010-04-09 00:35:39 +000010218 QualType FirstType, SecondType;
10219 switch (Action) {
10220 case AA_Assigning:
10221 case AA_Initializing:
10222 // The destination type comes first.
10223 FirstType = DstType;
10224 SecondType = SrcType;
10225 break;
Sean Hunt1e3f5ba2010-04-28 23:02:27 +000010226
Douglas Gregord4eea832010-04-09 00:35:39 +000010227 case AA_Returning:
10228 case AA_Passing:
10229 case AA_Converting:
10230 case AA_Sending:
10231 case AA_Casting:
10232 // The source type comes first.
10233 FirstType = SrcType;
10234 SecondType = DstType;
10235 break;
10236 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +000010237
Douglas Gregord4eea832010-04-09 00:35:39 +000010238 Diag(Loc, DiagKind) << FirstType << SecondType << Action
Anders Carlssonb76cd3d2009-11-10 04:46:30 +000010239 << SrcExpr->getSourceRange() << Hint;
Douglas Gregor926df6c2011-06-11 01:09:30 +000010240 if (CheckInferredResultType)
10241 EmitRelatedResultTypeNote(SrcExpr);
10242
Douglas Gregora41a8c52010-04-22 00:20:18 +000010243 if (Complained)
10244 *Complained = true;
Chris Lattner5cf216b2008-01-04 18:04:52 +000010245 return isInvalid;
10246}
Anders Carlssone21555e2008-11-30 19:50:32 +000010247
Chris Lattner3bf68932009-04-25 21:59:05 +000010248bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){
Eli Friedman3b5ccca2009-04-25 22:26:58 +000010249 llvm::APSInt ICEResult;
10250 if (E->isIntegerConstantExpr(ICEResult, Context)) {
10251 if (Result)
10252 *Result = ICEResult;
10253 return false;
10254 }
10255
Anders Carlssone21555e2008-11-30 19:50:32 +000010256 Expr::EvalResult EvalResult;
10257
Mike Stumpeed9cac2009-02-19 03:04:26 +000010258 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() ||
Anders Carlssone21555e2008-11-30 19:50:32 +000010259 EvalResult.HasSideEffects) {
10260 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange();
10261
10262 if (EvalResult.Diag) {
10263 // We only show the note if it's not the usual "invalid subexpression"
10264 // or if it's actually in a subexpression.
10265 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice ||
10266 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens())
10267 Diag(EvalResult.DiagLoc, EvalResult.Diag);
10268 }
Mike Stumpeed9cac2009-02-19 03:04:26 +000010269
Anders Carlssone21555e2008-11-30 19:50:32 +000010270 return true;
10271 }
10272
Eli Friedman3b5ccca2009-04-25 22:26:58 +000010273 Diag(E->getExprLoc(), diag::ext_expr_not_ice) <<
10274 E->getSourceRange();
Anders Carlssone21555e2008-11-30 19:50:32 +000010275
Eli Friedman3b5ccca2009-04-25 22:26:58 +000010276 if (EvalResult.Diag &&
Argyrios Kyrtzidis08274082010-12-15 18:44:22 +000010277 Diags.getDiagnosticLevel(diag::ext_expr_not_ice, EvalResult.DiagLoc)
10278 != Diagnostic::Ignored)
Eli Friedman3b5ccca2009-04-25 22:26:58 +000010279 Diag(EvalResult.DiagLoc, EvalResult.Diag);
Mike Stumpeed9cac2009-02-19 03:04:26 +000010280
Anders Carlssone21555e2008-11-30 19:50:32 +000010281 if (Result)
10282 *Result = EvalResult.Val.getInt();
10283 return false;
10284}
Douglas Gregore0762c92009-06-19 23:52:42 +000010285
Douglas Gregor2afce722009-11-26 00:44:06 +000010286void
Mike Stump1eb44332009-09-09 15:08:12 +000010287Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext) {
Douglas Gregor2afce722009-11-26 00:44:06 +000010288 ExprEvalContexts.push_back(
John McCallf85e1932011-06-15 23:02:42 +000010289 ExpressionEvaluationContextRecord(NewContext,
10290 ExprTemporaries.size(),
10291 ExprNeedsCleanups));
10292 ExprNeedsCleanups = false;
Douglas Gregorac7610d2009-06-22 20:57:11 +000010293}
10294
Mike Stump1eb44332009-09-09 15:08:12 +000010295void
Douglas Gregor2afce722009-11-26 00:44:06 +000010296Sema::PopExpressionEvaluationContext() {
10297 // Pop the current expression evaluation context off the stack.
10298 ExpressionEvaluationContextRecord Rec = ExprEvalContexts.back();
10299 ExprEvalContexts.pop_back();
Douglas Gregorac7610d2009-06-22 20:57:11 +000010300
Douglas Gregor06d33692009-12-12 07:57:52 +000010301 if (Rec.Context == PotentiallyPotentiallyEvaluated) {
10302 if (Rec.PotentiallyReferenced) {
10303 // Mark any remaining declarations in the current position of the stack
10304 // as "referenced". If they were not meant to be referenced, semantic
10305 // analysis would have eliminated them (e.g., in ActOnCXXTypeId).
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010306 for (PotentiallyReferencedDecls::iterator
Douglas Gregor06d33692009-12-12 07:57:52 +000010307 I = Rec.PotentiallyReferenced->begin(),
10308 IEnd = Rec.PotentiallyReferenced->end();
10309 I != IEnd; ++I)
10310 MarkDeclarationReferenced(I->first, I->second);
10311 }
10312
10313 if (Rec.PotentiallyDiagnosed) {
10314 // Emit any pending diagnostics.
10315 for (PotentiallyEmittedDiagnostics::iterator
10316 I = Rec.PotentiallyDiagnosed->begin(),
10317 IEnd = Rec.PotentiallyDiagnosed->end();
10318 I != IEnd; ++I)
10319 Diag(I->first, I->second);
10320 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010321 }
Douglas Gregor2afce722009-11-26 00:44:06 +000010322
10323 // When are coming out of an unevaluated context, clear out any
10324 // temporaries that we may have created as part of the evaluation of
10325 // the expression in that context: they aren't relevant because they
10326 // will never be constructed.
John McCallf85e1932011-06-15 23:02:42 +000010327 if (Rec.Context == Unevaluated) {
Douglas Gregor2afce722009-11-26 00:44:06 +000010328 ExprTemporaries.erase(ExprTemporaries.begin() + Rec.NumTemporaries,
10329 ExprTemporaries.end());
John McCallf85e1932011-06-15 23:02:42 +000010330 ExprNeedsCleanups = Rec.ParentNeedsCleanups;
10331
10332 // Otherwise, merge the contexts together.
10333 } else {
10334 ExprNeedsCleanups |= Rec.ParentNeedsCleanups;
10335 }
Douglas Gregor2afce722009-11-26 00:44:06 +000010336
10337 // Destroy the popped expression evaluation record.
10338 Rec.Destroy();
Douglas Gregorac7610d2009-06-22 20:57:11 +000010339}
Douglas Gregore0762c92009-06-19 23:52:42 +000010340
John McCallf85e1932011-06-15 23:02:42 +000010341void Sema::DiscardCleanupsInEvaluationContext() {
10342 ExprTemporaries.erase(
10343 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries,
10344 ExprTemporaries.end());
10345 ExprNeedsCleanups = false;
10346}
10347
Douglas Gregore0762c92009-06-19 23:52:42 +000010348/// \brief Note that the given declaration was referenced in the source code.
10349///
10350/// This routine should be invoke whenever a given declaration is referenced
10351/// in the source code, and where that reference occurred. If this declaration
10352/// reference means that the the declaration is used (C++ [basic.def.odr]p2,
10353/// C99 6.9p3), then the declaration will be marked as used.
10354///
10355/// \param Loc the location where the declaration was referenced.
10356///
10357/// \param D the declaration that has been referenced by the source code.
10358void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) {
10359 assert(D && "No declaration?");
Mike Stump1eb44332009-09-09 15:08:12 +000010360
Argyrios Kyrtzidis6b6b42a2011-04-19 19:51:10 +000010361 D->setReferenced();
10362
Douglas Gregorc070cc62010-06-17 23:14:26 +000010363 if (D->isUsed(false))
Douglas Gregord7f37bf2009-06-22 23:06:13 +000010364 return;
Mike Stump1eb44332009-09-09 15:08:12 +000010365
Douglas Gregorb5352cf2009-10-08 21:35:42 +000010366 // Mark a parameter or variable declaration "used", regardless of whether we're in a
10367 // template or not. The reason for this is that unevaluated expressions
10368 // (e.g. (void)sizeof()) constitute a use for warning purposes (-Wunused-variables and
10369 // -Wunused-parameters)
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010370 if (isa<ParmVarDecl>(D) ||
Douglas Gregorfc2ca562010-04-07 20:29:57 +000010371 (isa<VarDecl>(D) && D->getDeclContext()->isFunctionOrMethod())) {
Anders Carlsson2127ecc2010-10-22 23:37:08 +000010372 D->setUsed();
Douglas Gregorfc2ca562010-04-07 20:29:57 +000010373 return;
10374 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +000010375
Douglas Gregorfc2ca562010-04-07 20:29:57 +000010376 if (!isa<VarDecl>(D) && !isa<FunctionDecl>(D))
10377 return;
Sean Hunt1e3f5ba2010-04-28 23:02:27 +000010378
Douglas Gregore0762c92009-06-19 23:52:42 +000010379 // Do not mark anything as "used" within a dependent context; wait for
10380 // an instantiation.
10381 if (CurContext->isDependentContext())
10382 return;
Mike Stump1eb44332009-09-09 15:08:12 +000010383
Douglas Gregor2afce722009-11-26 00:44:06 +000010384 switch (ExprEvalContexts.back().Context) {
Douglas Gregorac7610d2009-06-22 20:57:11 +000010385 case Unevaluated:
10386 // We are in an expression that is not potentially evaluated; do nothing.
10387 return;
Mike Stump1eb44332009-09-09 15:08:12 +000010388
Douglas Gregorac7610d2009-06-22 20:57:11 +000010389 case PotentiallyEvaluated:
10390 // We are in a potentially-evaluated expression, so this declaration is
10391 // "used"; handle this below.
10392 break;
Mike Stump1eb44332009-09-09 15:08:12 +000010393
Douglas Gregorac7610d2009-06-22 20:57:11 +000010394 case PotentiallyPotentiallyEvaluated:
10395 // We are in an expression that may be potentially evaluated; queue this
10396 // declaration reference until we know whether the expression is
10397 // potentially evaluated.
Douglas Gregor2afce722009-11-26 00:44:06 +000010398 ExprEvalContexts.back().addReferencedDecl(Loc, D);
Douglas Gregorac7610d2009-06-22 20:57:11 +000010399 return;
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +000010400
10401 case PotentiallyEvaluatedIfUsed:
10402 // Referenced declarations will only be used if the construct in the
10403 // containing expression is used.
10404 return;
Douglas Gregorac7610d2009-06-22 20:57:11 +000010405 }
Mike Stump1eb44332009-09-09 15:08:12 +000010406
Douglas Gregore0762c92009-06-19 23:52:42 +000010407 // Note that this declaration has been used.
Fariborz Jahanianb7f4cc02009-06-22 17:30:33 +000010408 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) {
Sean Hunt1e238652011-05-12 03:51:51 +000010409 if (Constructor->isDefaulted() && Constructor->isDefaultConstructor()) {
10410 if (Constructor->isTrivial())
Chandler Carruth4e6fbce2010-08-23 07:55:51 +000010411 return;
10412 if (!Constructor->isUsed(false))
10413 DefineImplicitDefaultConstructor(Loc, Constructor);
Sean Hunt509f0482011-05-14 18:20:50 +000010414 } else if (Constructor->isDefaulted() &&
Sean Hunt49634cf2011-05-13 06:10:58 +000010415 Constructor->isCopyConstructor()) {
Douglas Gregorc070cc62010-06-17 23:14:26 +000010416 if (!Constructor->isUsed(false))
Sean Hunt49634cf2011-05-13 06:10:58 +000010417 DefineImplicitCopyConstructor(Loc, Constructor);
Fariborz Jahanian485f0872009-06-22 23:34:40 +000010418 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010419
Douglas Gregor6fb745b2010-05-13 16:44:06 +000010420 MarkVTableUsed(Loc, Constructor->getParent());
Fariborz Jahanian8d2b3562009-06-26 23:49:16 +000010421 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) {
Sean Huntcb45a0f2011-05-12 22:46:25 +000010422 if (Destructor->isDefaulted() && !Destructor->isUsed(false))
Fariborz Jahanian8d2b3562009-06-26 23:49:16 +000010423 DefineImplicitDestructor(Loc, Destructor);
Douglas Gregor6fb745b2010-05-13 16:44:06 +000010424 if (Destructor->isVirtual())
10425 MarkVTableUsed(Loc, Destructor->getParent());
Fariborz Jahanianc75bc2d2009-06-25 21:45:19 +000010426 } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D)) {
Sean Hunt2b188082011-05-14 05:23:28 +000010427 if (MethodDecl->isDefaulted() && MethodDecl->isOverloadedOperator() &&
Fariborz Jahanianc75bc2d2009-06-25 21:45:19 +000010428 MethodDecl->getOverloadedOperator() == OO_Equal) {
Douglas Gregorc070cc62010-06-17 23:14:26 +000010429 if (!MethodDecl->isUsed(false))
Douglas Gregor39957dc2010-05-01 15:04:51 +000010430 DefineImplicitCopyAssignment(Loc, MethodDecl);
Douglas Gregor6fb745b2010-05-13 16:44:06 +000010431 } else if (MethodDecl->isVirtual())
10432 MarkVTableUsed(Loc, MethodDecl->getParent());
Fariborz Jahanianc75bc2d2009-06-25 21:45:19 +000010433 }
Fariborz Jahanianf5ed9e02009-06-24 22:09:44 +000010434 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) {
John McCall15e310a2011-02-19 02:53:41 +000010435 // Recursive functions should be marked when used from another function.
10436 if (CurContext == Function) return;
10437
Mike Stump1eb44332009-09-09 15:08:12 +000010438 // Implicit instantiation of function templates and member functions of
Douglas Gregor1637be72009-06-26 00:10:03 +000010439 // class templates.
Douglas Gregor6cfacfe2010-05-17 17:34:56 +000010440 if (Function->isImplicitlyInstantiable()) {
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +000010441 bool AlreadyInstantiated = false;
10442 if (FunctionTemplateSpecializationInfo *SpecInfo
10443 = Function->getTemplateSpecializationInfo()) {
10444 if (SpecInfo->getPointOfInstantiation().isInvalid())
10445 SpecInfo->setPointOfInstantiation(Loc);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010446 else if (SpecInfo->getTemplateSpecializationKind()
Douglas Gregor3b846b62009-10-27 20:53:28 +000010447 == TSK_ImplicitInstantiation)
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +000010448 AlreadyInstantiated = true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010449 } else if (MemberSpecializationInfo *MSInfo
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +000010450 = Function->getMemberSpecializationInfo()) {
10451 if (MSInfo->getPointOfInstantiation().isInvalid())
10452 MSInfo->setPointOfInstantiation(Loc);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010453 else if (MSInfo->getTemplateSpecializationKind()
Douglas Gregor3b846b62009-10-27 20:53:28 +000010454 == TSK_ImplicitInstantiation)
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +000010455 AlreadyInstantiated = true;
10456 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010457
Douglas Gregor60406be2010-01-16 22:29:39 +000010458 if (!AlreadyInstantiated) {
10459 if (isa<CXXRecordDecl>(Function->getDeclContext()) &&
10460 cast<CXXRecordDecl>(Function->getDeclContext())->isLocalClass())
10461 PendingLocalImplicitInstantiations.push_back(std::make_pair(Function,
10462 Loc));
10463 else
Chandler Carruth62c78d52010-08-25 08:44:16 +000010464 PendingInstantiations.push_back(std::make_pair(Function, Loc));
Douglas Gregor60406be2010-01-16 22:29:39 +000010465 }
John McCall15e310a2011-02-19 02:53:41 +000010466 } else {
10467 // Walk redefinitions, as some of them may be instantiable.
Gabor Greif40181c42010-08-28 00:16:06 +000010468 for (FunctionDecl::redecl_iterator i(Function->redecls_begin()),
10469 e(Function->redecls_end()); i != e; ++i) {
Gabor Greifbe9ebe32010-08-28 01:58:12 +000010470 if (!i->isUsed(false) && i->isImplicitlyInstantiable())
Gabor Greif40181c42010-08-28 00:16:06 +000010471 MarkDeclarationReferenced(Loc, *i);
10472 }
John McCall15e310a2011-02-19 02:53:41 +000010473 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010474
John McCall15e310a2011-02-19 02:53:41 +000010475 // Keep track of used but undefined functions.
10476 if (!Function->isPure() && !Function->hasBody() &&
10477 Function->getLinkage() != ExternalLinkage) {
10478 SourceLocation &old = UndefinedInternals[Function->getCanonicalDecl()];
10479 if (old.isInvalid()) old = Loc;
10480 }
Argyrios Kyrtzidis58b52592010-08-25 10:34:54 +000010481
John McCall15e310a2011-02-19 02:53:41 +000010482 Function->setUsed(true);
Douglas Gregore0762c92009-06-19 23:52:42 +000010483 return;
Douglas Gregord7f37bf2009-06-22 23:06:13 +000010484 }
Mike Stump1eb44332009-09-09 15:08:12 +000010485
Douglas Gregore0762c92009-06-19 23:52:42 +000010486 if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
Douglas Gregor7caa6822009-07-24 20:34:43 +000010487 // Implicit instantiation of static data members of class templates.
Mike Stump1eb44332009-09-09 15:08:12 +000010488 if (Var->isStaticDataMember() &&
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +000010489 Var->getInstantiatedFromStaticDataMember()) {
10490 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo();
10491 assert(MSInfo && "Missing member specialization information?");
10492 if (MSInfo->getPointOfInstantiation().isInvalid() &&
10493 MSInfo->getTemplateSpecializationKind()== TSK_ImplicitInstantiation) {
10494 MSInfo->setPointOfInstantiation(Loc);
Sebastian Redlf79a7192011-04-29 08:19:30 +000010495 // This is a modification of an existing AST node. Notify listeners.
10496 if (ASTMutationListener *L = getASTMutationListener())
10497 L->StaticDataMemberInstantiated(Var);
Chandler Carruth62c78d52010-08-25 08:44:16 +000010498 PendingInstantiations.push_back(std::make_pair(Var, Loc));
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +000010499 }
10500 }
Mike Stump1eb44332009-09-09 15:08:12 +000010501
John McCall77efc682011-02-21 19:25:48 +000010502 // Keep track of used but undefined variables. We make a hole in
10503 // the warning for static const data members with in-line
10504 // initializers.
John McCall15e310a2011-02-19 02:53:41 +000010505 if (Var->hasDefinition() == VarDecl::DeclarationOnly
John McCall77efc682011-02-21 19:25:48 +000010506 && Var->getLinkage() != ExternalLinkage
10507 && !(Var->isStaticDataMember() && Var->hasInit())) {
John McCall15e310a2011-02-19 02:53:41 +000010508 SourceLocation &old = UndefinedInternals[Var->getCanonicalDecl()];
10509 if (old.isInvalid()) old = Loc;
10510 }
Douglas Gregor7caa6822009-07-24 20:34:43 +000010511
Douglas Gregore0762c92009-06-19 23:52:42 +000010512 D->setUsed(true);
Douglas Gregor7caa6822009-07-24 20:34:43 +000010513 return;
Sam Weinigcce6ebc2009-09-11 03:29:30 +000010514 }
Douglas Gregore0762c92009-06-19 23:52:42 +000010515}
Anders Carlsson8c8d9192009-10-09 23:51:55 +000010516
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010517namespace {
Chandler Carruthdfc35e32010-06-09 08:17:30 +000010518 // Mark all of the declarations referenced
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010519 // FIXME: Not fully implemented yet! We need to have a better understanding
Chandler Carruthdfc35e32010-06-09 08:17:30 +000010520 // of when we're entering
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010521 class MarkReferencedDecls : public RecursiveASTVisitor<MarkReferencedDecls> {
10522 Sema &S;
10523 SourceLocation Loc;
Chandler Carruthdfc35e32010-06-09 08:17:30 +000010524
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010525 public:
10526 typedef RecursiveASTVisitor<MarkReferencedDecls> Inherited;
Chandler Carruthdfc35e32010-06-09 08:17:30 +000010527
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010528 MarkReferencedDecls(Sema &S, SourceLocation Loc) : S(S), Loc(Loc) { }
Chandler Carruthdfc35e32010-06-09 08:17:30 +000010529
10530 bool TraverseTemplateArgument(const TemplateArgument &Arg);
10531 bool TraverseRecordType(RecordType *T);
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010532 };
10533}
10534
Chandler Carruthdfc35e32010-06-09 08:17:30 +000010535bool MarkReferencedDecls::TraverseTemplateArgument(
10536 const TemplateArgument &Arg) {
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010537 if (Arg.getKind() == TemplateArgument::Declaration) {
10538 S.MarkDeclarationReferenced(Loc, Arg.getAsDecl());
10539 }
Chandler Carruthdfc35e32010-06-09 08:17:30 +000010540
10541 return Inherited::TraverseTemplateArgument(Arg);
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010542}
10543
Chandler Carruthdfc35e32010-06-09 08:17:30 +000010544bool MarkReferencedDecls::TraverseRecordType(RecordType *T) {
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010545 if (ClassTemplateSpecializationDecl *Spec
10546 = dyn_cast<ClassTemplateSpecializationDecl>(T->getDecl())) {
10547 const TemplateArgumentList &Args = Spec->getTemplateArgs();
Douglas Gregor910f8002010-11-07 23:05:16 +000010548 return TraverseTemplateArguments(Args.data(), Args.size());
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010549 }
10550
Chandler Carruthe3e210c2010-06-10 10:31:57 +000010551 return true;
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010552}
10553
10554void Sema::MarkDeclarationsReferencedInType(SourceLocation Loc, QualType T) {
10555 MarkReferencedDecls Marker(*this, Loc);
Chandler Carruthdfc35e32010-06-09 08:17:30 +000010556 Marker.TraverseType(Context.getCanonicalType(T));
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010557}
10558
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +000010559namespace {
10560 /// \brief Helper class that marks all of the declarations referenced by
10561 /// potentially-evaluated subexpressions as "referenced".
10562 class EvaluatedExprMarker : public EvaluatedExprVisitor<EvaluatedExprMarker> {
10563 Sema &S;
10564
10565 public:
10566 typedef EvaluatedExprVisitor<EvaluatedExprMarker> Inherited;
10567
10568 explicit EvaluatedExprMarker(Sema &S) : Inherited(S.Context), S(S) { }
10569
10570 void VisitDeclRefExpr(DeclRefExpr *E) {
10571 S.MarkDeclarationReferenced(E->getLocation(), E->getDecl());
10572 }
10573
10574 void VisitMemberExpr(MemberExpr *E) {
10575 S.MarkDeclarationReferenced(E->getMemberLoc(), E->getMemberDecl());
Douglas Gregor4fcf5b22010-09-11 23:32:50 +000010576 Inherited::VisitMemberExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +000010577 }
10578
10579 void VisitCXXNewExpr(CXXNewExpr *E) {
10580 if (E->getConstructor())
10581 S.MarkDeclarationReferenced(E->getLocStart(), E->getConstructor());
10582 if (E->getOperatorNew())
10583 S.MarkDeclarationReferenced(E->getLocStart(), E->getOperatorNew());
10584 if (E->getOperatorDelete())
10585 S.MarkDeclarationReferenced(E->getLocStart(), E->getOperatorDelete());
Douglas Gregor4fcf5b22010-09-11 23:32:50 +000010586 Inherited::VisitCXXNewExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +000010587 }
10588
10589 void VisitCXXDeleteExpr(CXXDeleteExpr *E) {
10590 if (E->getOperatorDelete())
10591 S.MarkDeclarationReferenced(E->getLocStart(), E->getOperatorDelete());
Douglas Gregor5833b0b2010-09-14 22:55:20 +000010592 QualType Destroyed = S.Context.getBaseElementType(E->getDestroyedType());
10593 if (const RecordType *DestroyedRec = Destroyed->getAs<RecordType>()) {
10594 CXXRecordDecl *Record = cast<CXXRecordDecl>(DestroyedRec->getDecl());
10595 S.MarkDeclarationReferenced(E->getLocStart(),
10596 S.LookupDestructor(Record));
10597 }
10598
Douglas Gregor4fcf5b22010-09-11 23:32:50 +000010599 Inherited::VisitCXXDeleteExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +000010600 }
10601
10602 void VisitCXXConstructExpr(CXXConstructExpr *E) {
10603 S.MarkDeclarationReferenced(E->getLocStart(), E->getConstructor());
Douglas Gregor4fcf5b22010-09-11 23:32:50 +000010604 Inherited::VisitCXXConstructExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +000010605 }
10606
10607 void VisitBlockDeclRefExpr(BlockDeclRefExpr *E) {
10608 S.MarkDeclarationReferenced(E->getLocation(), E->getDecl());
10609 }
Douglas Gregor102ff972010-10-19 17:17:35 +000010610
10611 void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *E) {
10612 Visit(E->getExpr());
10613 }
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +000010614 };
10615}
10616
10617/// \brief Mark any declarations that appear within this expression or any
10618/// potentially-evaluated subexpressions as "referenced".
10619void Sema::MarkDeclarationsReferencedInExpr(Expr *E) {
10620 EvaluatedExprMarker(*this).Visit(E);
10621}
10622
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +000010623/// \brief Emit a diagnostic that describes an effect on the run-time behavior
10624/// of the program being compiled.
10625///
10626/// This routine emits the given diagnostic when the code currently being
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010627/// type-checked is "potentially evaluated", meaning that there is a
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +000010628/// possibility that the code will actually be executable. Code in sizeof()
10629/// expressions, code used only during overload resolution, etc., are not
10630/// potentially evaluated. This routine will suppress such diagnostics or,
10631/// in the absolutely nutty case of potentially potentially evaluated
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010632/// expressions (C++ typeid), queue the diagnostic to potentially emit it
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +000010633/// later.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010634///
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +000010635/// This routine should be used for all diagnostics that describe the run-time
10636/// behavior of a program, such as passing a non-POD value through an ellipsis.
10637/// Failure to do so will likely result in spurious diagnostics or failures
10638/// during overload resolution or within sizeof/alignof/typeof/typeid.
Ted Kremenek762696f2011-02-23 01:51:43 +000010639bool Sema::DiagRuntimeBehavior(SourceLocation Loc, const Stmt *stmt,
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +000010640 const PartialDiagnostic &PD) {
John McCallf85e1932011-06-15 23:02:42 +000010641 switch (ExprEvalContexts.back().Context) {
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +000010642 case Unevaluated:
10643 // The argument will never be evaluated, so don't complain.
10644 break;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010645
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +000010646 case PotentiallyEvaluated:
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +000010647 case PotentiallyEvaluatedIfUsed:
Ted Kremenek351ba912011-02-23 01:52:04 +000010648 if (stmt && getCurFunctionOrMethodDecl()) {
10649 FunctionScopes.back()->PossiblyUnreachableDiags.
10650 push_back(sema::PossiblyUnreachableDiag(PD, Loc, stmt));
10651 }
10652 else
10653 Diag(Loc, PD);
10654
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +000010655 return true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010656
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +000010657 case PotentiallyPotentiallyEvaluated:
10658 ExprEvalContexts.back().addDiagnostic(Loc, PD);
10659 break;
10660 }
10661
10662 return false;
10663}
10664
Anders Carlsson8c8d9192009-10-09 23:51:55 +000010665bool Sema::CheckCallReturnType(QualType ReturnType, SourceLocation Loc,
10666 CallExpr *CE, FunctionDecl *FD) {
10667 if (ReturnType->isVoidType() || !ReturnType->isIncompleteType())
10668 return false;
10669
10670 PartialDiagnostic Note =
10671 FD ? PDiag(diag::note_function_with_incomplete_return_type_declared_here)
10672 << FD->getDeclName() : PDiag();
10673 SourceLocation NoteLoc = FD ? FD->getLocation() : SourceLocation();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010674
Anders Carlsson8c8d9192009-10-09 23:51:55 +000010675 if (RequireCompleteType(Loc, ReturnType,
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010676 FD ?
Anders Carlsson8c8d9192009-10-09 23:51:55 +000010677 PDiag(diag::err_call_function_incomplete_return)
10678 << CE->getSourceRange() << FD->getDeclName() :
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010679 PDiag(diag::err_call_incomplete_return)
Anders Carlsson8c8d9192009-10-09 23:51:55 +000010680 << CE->getSourceRange(),
10681 std::make_pair(NoteLoc, Note)))
10682 return true;
10683
10684 return false;
10685}
10686
Douglas Gregor92c3a042011-01-19 16:50:08 +000010687// Diagnose the s/=/==/ and s/\|=/!=/ typos. Note that adding parentheses
John McCall5a881bb2009-10-12 21:59:07 +000010688// will prevent this condition from triggering, which is what we want.
10689void Sema::DiagnoseAssignmentAsCondition(Expr *E) {
10690 SourceLocation Loc;
10691
John McCalla52ef082009-11-11 02:41:58 +000010692 unsigned diagnostic = diag::warn_condition_is_assignment;
Douglas Gregor92c3a042011-01-19 16:50:08 +000010693 bool IsOrAssign = false;
John McCalla52ef082009-11-11 02:41:58 +000010694
John McCall5a881bb2009-10-12 21:59:07 +000010695 if (isa<BinaryOperator>(E)) {
10696 BinaryOperator *Op = cast<BinaryOperator>(E);
Douglas Gregor92c3a042011-01-19 16:50:08 +000010697 if (Op->getOpcode() != BO_Assign && Op->getOpcode() != BO_OrAssign)
John McCall5a881bb2009-10-12 21:59:07 +000010698 return;
10699
Douglas Gregor92c3a042011-01-19 16:50:08 +000010700 IsOrAssign = Op->getOpcode() == BO_OrAssign;
10701
John McCallc8d8ac52009-11-12 00:06:05 +000010702 // Greylist some idioms by putting them into a warning subcategory.
10703 if (ObjCMessageExpr *ME
10704 = dyn_cast<ObjCMessageExpr>(Op->getRHS()->IgnoreParenCasts())) {
10705 Selector Sel = ME->getSelector();
10706
John McCallc8d8ac52009-11-12 00:06:05 +000010707 // self = [<foo> init...]
Douglas Gregor813d8342011-02-18 22:29:55 +000010708 if (isSelfExpr(Op->getLHS()) && Sel.getNameForSlot(0).startswith("init"))
John McCallc8d8ac52009-11-12 00:06:05 +000010709 diagnostic = diag::warn_condition_is_idiomatic_assignment;
10710
10711 // <foo> = [<bar> nextObject]
Douglas Gregor813d8342011-02-18 22:29:55 +000010712 else if (Sel.isUnarySelector() && Sel.getNameForSlot(0) == "nextObject")
John McCallc8d8ac52009-11-12 00:06:05 +000010713 diagnostic = diag::warn_condition_is_idiomatic_assignment;
10714 }
John McCalla52ef082009-11-11 02:41:58 +000010715
John McCall5a881bb2009-10-12 21:59:07 +000010716 Loc = Op->getOperatorLoc();
10717 } else if (isa<CXXOperatorCallExpr>(E)) {
10718 CXXOperatorCallExpr *Op = cast<CXXOperatorCallExpr>(E);
Douglas Gregor92c3a042011-01-19 16:50:08 +000010719 if (Op->getOperator() != OO_Equal && Op->getOperator() != OO_PipeEqual)
John McCall5a881bb2009-10-12 21:59:07 +000010720 return;
10721
Douglas Gregor92c3a042011-01-19 16:50:08 +000010722 IsOrAssign = Op->getOperator() == OO_PipeEqual;
John McCall5a881bb2009-10-12 21:59:07 +000010723 Loc = Op->getOperatorLoc();
10724 } else {
10725 // Not an assignment.
10726 return;
10727 }
10728
Douglas Gregor55b38842010-04-14 16:09:52 +000010729 Diag(Loc, diagnostic) << E->getSourceRange();
Douglas Gregor92c3a042011-01-19 16:50:08 +000010730
Argyrios Kyrtzidisabdd3b32011-04-25 23:01:29 +000010731 SourceLocation Open = E->getSourceRange().getBegin();
10732 SourceLocation Close = PP.getLocForEndOfToken(E->getSourceRange().getEnd());
10733 Diag(Loc, diag::note_condition_assign_silence)
10734 << FixItHint::CreateInsertion(Open, "(")
10735 << FixItHint::CreateInsertion(Close, ")");
10736
Douglas Gregor92c3a042011-01-19 16:50:08 +000010737 if (IsOrAssign)
10738 Diag(Loc, diag::note_condition_or_assign_to_comparison)
10739 << FixItHint::CreateReplacement(Loc, "!=");
10740 else
10741 Diag(Loc, diag::note_condition_assign_to_comparison)
10742 << FixItHint::CreateReplacement(Loc, "==");
John McCall5a881bb2009-10-12 21:59:07 +000010743}
10744
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +000010745/// \brief Redundant parentheses over an equality comparison can indicate
10746/// that the user intended an assignment used as condition.
10747void Sema::DiagnoseEqualityWithExtraParens(ParenExpr *parenE) {
Argyrios Kyrtzidiscf1620a2011-02-01 22:23:56 +000010748 // Don't warn if the parens came from a macro.
10749 SourceLocation parenLoc = parenE->getLocStart();
10750 if (parenLoc.isInvalid() || parenLoc.isMacroID())
10751 return;
Argyrios Kyrtzidis170a6a22011-03-28 23:52:04 +000010752 // Don't warn for dependent expressions.
10753 if (parenE->isTypeDependent())
10754 return;
Argyrios Kyrtzidiscf1620a2011-02-01 22:23:56 +000010755
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +000010756 Expr *E = parenE->IgnoreParens();
10757
10758 if (BinaryOperator *opE = dyn_cast<BinaryOperator>(E))
Argyrios Kyrtzidis70f23302011-02-01 19:32:59 +000010759 if (opE->getOpcode() == BO_EQ &&
10760 opE->getLHS()->IgnoreParenImpCasts()->isModifiableLvalue(Context)
10761 == Expr::MLV_Valid) {
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +000010762 SourceLocation Loc = opE->getOperatorLoc();
Ted Kremenek006ae382011-02-01 22:36:09 +000010763
Ted Kremenekf7275cd2011-02-02 02:20:30 +000010764 Diag(Loc, diag::warn_equality_with_extra_parens) << E->getSourceRange();
Ted Kremenekf7275cd2011-02-02 02:20:30 +000010765 Diag(Loc, diag::note_equality_comparison_silence)
10766 << FixItHint::CreateRemoval(parenE->getSourceRange().getBegin())
10767 << FixItHint::CreateRemoval(parenE->getSourceRange().getEnd());
Argyrios Kyrtzidisabdd3b32011-04-25 23:01:29 +000010768 Diag(Loc, diag::note_equality_comparison_to_assign)
10769 << FixItHint::CreateReplacement(Loc, "=");
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +000010770 }
10771}
10772
John Wiegley429bb272011-04-08 18:41:53 +000010773ExprResult Sema::CheckBooleanCondition(Expr *E, SourceLocation Loc) {
John McCall5a881bb2009-10-12 21:59:07 +000010774 DiagnoseAssignmentAsCondition(E);
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +000010775 if (ParenExpr *parenE = dyn_cast<ParenExpr>(E))
10776 DiagnoseEqualityWithExtraParens(parenE);
John McCall5a881bb2009-10-12 21:59:07 +000010777
John McCall864c0412011-04-26 20:42:42 +000010778 ExprResult result = CheckPlaceholderExpr(E);
10779 if (result.isInvalid()) return ExprError();
10780 E = result.take();
Argyrios Kyrtzidis11ab7902010-11-01 18:49:26 +000010781
John McCall864c0412011-04-26 20:42:42 +000010782 if (!E->isTypeDependent()) {
John McCallf6a16482010-12-04 03:47:34 +000010783 if (getLangOptions().CPlusPlus)
10784 return CheckCXXBooleanCondition(E); // C++ 6.4p4
10785
John Wiegley429bb272011-04-08 18:41:53 +000010786 ExprResult ERes = DefaultFunctionArrayLvalueConversion(E);
10787 if (ERes.isInvalid())
10788 return ExprError();
10789 E = ERes.take();
John McCallabc56c72010-12-04 06:09:13 +000010790
10791 QualType T = E->getType();
John Wiegley429bb272011-04-08 18:41:53 +000010792 if (!T->isScalarType()) { // C99 6.8.4.1p1
10793 Diag(Loc, diag::err_typecheck_statement_requires_scalar)
10794 << T << E->getSourceRange();
10795 return ExprError();
10796 }
John McCall5a881bb2009-10-12 21:59:07 +000010797 }
10798
John Wiegley429bb272011-04-08 18:41:53 +000010799 return Owned(E);
John McCall5a881bb2009-10-12 21:59:07 +000010800}
Douglas Gregor586596f2010-05-06 17:25:47 +000010801
John McCall60d7b3a2010-08-24 06:29:42 +000010802ExprResult Sema::ActOnBooleanCondition(Scope *S, SourceLocation Loc,
10803 Expr *Sub) {
Douglas Gregoreecf38f2010-05-06 21:39:56 +000010804 if (!Sub)
Douglas Gregor586596f2010-05-06 17:25:47 +000010805 return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +000010806
10807 return CheckBooleanCondition(Sub, Loc);
Douglas Gregor586596f2010-05-06 17:25:47 +000010808}
John McCall2a984ca2010-10-12 00:20:44 +000010809
John McCall1de4d4e2011-04-07 08:22:57 +000010810namespace {
John McCall755d8492011-04-12 00:42:48 +000010811 /// A visitor for rebuilding a call to an __unknown_any expression
10812 /// to have an appropriate type.
10813 struct RebuildUnknownAnyFunction
10814 : StmtVisitor<RebuildUnknownAnyFunction, ExprResult> {
10815
10816 Sema &S;
10817
10818 RebuildUnknownAnyFunction(Sema &S) : S(S) {}
10819
10820 ExprResult VisitStmt(Stmt *S) {
10821 llvm_unreachable("unexpected statement!");
10822 return ExprError();
10823 }
10824
10825 ExprResult VisitExpr(Expr *expr) {
10826 S.Diag(expr->getExprLoc(), diag::err_unsupported_unknown_any_call)
10827 << expr->getSourceRange();
10828 return ExprError();
10829 }
10830
10831 /// Rebuild an expression which simply semantically wraps another
10832 /// expression which it shares the type and value kind of.
10833 template <class T> ExprResult rebuildSugarExpr(T *expr) {
10834 ExprResult subResult = Visit(expr->getSubExpr());
10835 if (subResult.isInvalid()) return ExprError();
10836
10837 Expr *subExpr = subResult.take();
10838 expr->setSubExpr(subExpr);
10839 expr->setType(subExpr->getType());
10840 expr->setValueKind(subExpr->getValueKind());
10841 assert(expr->getObjectKind() == OK_Ordinary);
10842 return expr;
10843 }
10844
10845 ExprResult VisitParenExpr(ParenExpr *paren) {
10846 return rebuildSugarExpr(paren);
10847 }
10848
10849 ExprResult VisitUnaryExtension(UnaryOperator *op) {
10850 return rebuildSugarExpr(op);
10851 }
10852
10853 ExprResult VisitUnaryAddrOf(UnaryOperator *op) {
10854 ExprResult subResult = Visit(op->getSubExpr());
10855 if (subResult.isInvalid()) return ExprError();
10856
10857 Expr *subExpr = subResult.take();
10858 op->setSubExpr(subExpr);
10859 op->setType(S.Context.getPointerType(subExpr->getType()));
10860 assert(op->getValueKind() == VK_RValue);
10861 assert(op->getObjectKind() == OK_Ordinary);
10862 return op;
10863 }
10864
10865 ExprResult resolveDecl(Expr *expr, ValueDecl *decl) {
10866 if (!isa<FunctionDecl>(decl)) return VisitExpr(expr);
10867
10868 expr->setType(decl->getType());
10869
10870 assert(expr->getValueKind() == VK_RValue);
10871 if (S.getLangOptions().CPlusPlus &&
10872 !(isa<CXXMethodDecl>(decl) &&
10873 cast<CXXMethodDecl>(decl)->isInstance()))
10874 expr->setValueKind(VK_LValue);
10875
10876 return expr;
10877 }
10878
10879 ExprResult VisitMemberExpr(MemberExpr *mem) {
10880 return resolveDecl(mem, mem->getMemberDecl());
10881 }
10882
10883 ExprResult VisitDeclRefExpr(DeclRefExpr *ref) {
10884 return resolveDecl(ref, ref->getDecl());
10885 }
10886 };
10887}
10888
10889/// Given a function expression of unknown-any type, try to rebuild it
10890/// to have a function type.
10891static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *fn) {
10892 ExprResult result = RebuildUnknownAnyFunction(S).Visit(fn);
10893 if (result.isInvalid()) return ExprError();
10894 return S.DefaultFunctionArrayConversion(result.take());
10895}
10896
10897namespace {
John McCall379b5152011-04-11 07:02:50 +000010898 /// A visitor for rebuilding an expression of type __unknown_anytype
10899 /// into one which resolves the type directly on the referring
10900 /// expression. Strict preservation of the original source
10901 /// structure is not a goal.
John McCall1de4d4e2011-04-07 08:22:57 +000010902 struct RebuildUnknownAnyExpr
John McCalla5fc4722011-04-09 22:50:59 +000010903 : StmtVisitor<RebuildUnknownAnyExpr, ExprResult> {
John McCall1de4d4e2011-04-07 08:22:57 +000010904
10905 Sema &S;
10906
10907 /// The current destination type.
10908 QualType DestType;
10909
10910 RebuildUnknownAnyExpr(Sema &S, QualType castType)
10911 : S(S), DestType(castType) {}
10912
John McCalla5fc4722011-04-09 22:50:59 +000010913 ExprResult VisitStmt(Stmt *S) {
John McCall379b5152011-04-11 07:02:50 +000010914 llvm_unreachable("unexpected statement!");
John McCalla5fc4722011-04-09 22:50:59 +000010915 return ExprError();
John McCall1de4d4e2011-04-07 08:22:57 +000010916 }
10917
John McCall379b5152011-04-11 07:02:50 +000010918 ExprResult VisitExpr(Expr *expr) {
10919 S.Diag(expr->getExprLoc(), diag::err_unsupported_unknown_any_expr)
10920 << expr->getSourceRange();
10921 return ExprError();
John McCall1de4d4e2011-04-07 08:22:57 +000010922 }
10923
John McCall379b5152011-04-11 07:02:50 +000010924 ExprResult VisitCallExpr(CallExpr *call);
10925 ExprResult VisitObjCMessageExpr(ObjCMessageExpr *message);
10926
John McCalla5fc4722011-04-09 22:50:59 +000010927 /// Rebuild an expression which simply semantically wraps another
10928 /// expression which it shares the type and value kind of.
10929 template <class T> ExprResult rebuildSugarExpr(T *expr) {
10930 ExprResult subResult = Visit(expr->getSubExpr());
John McCall755d8492011-04-12 00:42:48 +000010931 if (subResult.isInvalid()) return ExprError();
John McCalla5fc4722011-04-09 22:50:59 +000010932 Expr *subExpr = subResult.take();
10933 expr->setSubExpr(subExpr);
10934 expr->setType(subExpr->getType());
10935 expr->setValueKind(subExpr->getValueKind());
10936 assert(expr->getObjectKind() == OK_Ordinary);
10937 return expr;
10938 }
John McCall1de4d4e2011-04-07 08:22:57 +000010939
John McCalla5fc4722011-04-09 22:50:59 +000010940 ExprResult VisitParenExpr(ParenExpr *paren) {
10941 return rebuildSugarExpr(paren);
10942 }
10943
10944 ExprResult VisitUnaryExtension(UnaryOperator *op) {
10945 return rebuildSugarExpr(op);
10946 }
10947
John McCall755d8492011-04-12 00:42:48 +000010948 ExprResult VisitUnaryAddrOf(UnaryOperator *op) {
10949 const PointerType *ptr = DestType->getAs<PointerType>();
10950 if (!ptr) {
10951 S.Diag(op->getOperatorLoc(), diag::err_unknown_any_addrof)
10952 << op->getSourceRange();
10953 return ExprError();
10954 }
10955 assert(op->getValueKind() == VK_RValue);
10956 assert(op->getObjectKind() == OK_Ordinary);
10957 op->setType(DestType);
10958
10959 // Build the sub-expression as if it were an object of the pointee type.
10960 DestType = ptr->getPointeeType();
10961 ExprResult subResult = Visit(op->getSubExpr());
10962 if (subResult.isInvalid()) return ExprError();
10963 op->setSubExpr(subResult.take());
10964 return op;
10965 }
10966
John McCall379b5152011-04-11 07:02:50 +000010967 ExprResult VisitImplicitCastExpr(ImplicitCastExpr *ice);
John McCalla5fc4722011-04-09 22:50:59 +000010968
John McCall755d8492011-04-12 00:42:48 +000010969 ExprResult resolveDecl(Expr *expr, ValueDecl *decl);
John McCalla5fc4722011-04-09 22:50:59 +000010970
John McCall755d8492011-04-12 00:42:48 +000010971 ExprResult VisitMemberExpr(MemberExpr *mem) {
10972 return resolveDecl(mem, mem->getMemberDecl());
10973 }
John McCalla5fc4722011-04-09 22:50:59 +000010974
10975 ExprResult VisitDeclRefExpr(DeclRefExpr *ref) {
John McCall379b5152011-04-11 07:02:50 +000010976 return resolveDecl(ref, ref->getDecl());
John McCall1de4d4e2011-04-07 08:22:57 +000010977 }
10978 };
10979}
10980
John McCall379b5152011-04-11 07:02:50 +000010981/// Rebuilds a call expression which yielded __unknown_anytype.
10982ExprResult RebuildUnknownAnyExpr::VisitCallExpr(CallExpr *call) {
10983 Expr *callee = call->getCallee();
10984
10985 enum FnKind {
John McCallf5307512011-04-27 00:36:17 +000010986 FK_MemberFunction,
John McCall379b5152011-04-11 07:02:50 +000010987 FK_FunctionPointer,
10988 FK_BlockPointer
10989 };
10990
10991 FnKind kind;
10992 QualType type = callee->getType();
John McCallf5307512011-04-27 00:36:17 +000010993 if (type == S.Context.BoundMemberTy) {
10994 assert(isa<CXXMemberCallExpr>(call) || isa<CXXOperatorCallExpr>(call));
10995 kind = FK_MemberFunction;
10996 type = Expr::findBoundMemberType(callee);
John McCall379b5152011-04-11 07:02:50 +000010997 } else if (const PointerType *ptr = type->getAs<PointerType>()) {
10998 type = ptr->getPointeeType();
10999 kind = FK_FunctionPointer;
11000 } else {
11001 type = type->castAs<BlockPointerType>()->getPointeeType();
11002 kind = FK_BlockPointer;
11003 }
11004 const FunctionType *fnType = type->castAs<FunctionType>();
11005
11006 // Verify that this is a legal result type of a function.
11007 if (DestType->isArrayType() || DestType->isFunctionType()) {
11008 unsigned diagID = diag::err_func_returning_array_function;
11009 if (kind == FK_BlockPointer)
11010 diagID = diag::err_block_returning_array_function;
11011
11012 S.Diag(call->getExprLoc(), diagID)
11013 << DestType->isFunctionType() << DestType;
11014 return ExprError();
11015 }
11016
11017 // Otherwise, go ahead and set DestType as the call's result.
11018 call->setType(DestType.getNonLValueExprType(S.Context));
11019 call->setValueKind(Expr::getValueKindForType(DestType));
11020 assert(call->getObjectKind() == OK_Ordinary);
11021
11022 // Rebuild the function type, replacing the result type with DestType.
11023 if (const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(fnType))
11024 DestType = S.Context.getFunctionType(DestType,
11025 proto->arg_type_begin(),
11026 proto->getNumArgs(),
11027 proto->getExtProtoInfo());
11028 else
11029 DestType = S.Context.getFunctionNoProtoType(DestType,
11030 fnType->getExtInfo());
11031
11032 // Rebuild the appropriate pointer-to-function type.
11033 switch (kind) {
John McCallf5307512011-04-27 00:36:17 +000011034 case FK_MemberFunction:
John McCall379b5152011-04-11 07:02:50 +000011035 // Nothing to do.
11036 break;
11037
11038 case FK_FunctionPointer:
11039 DestType = S.Context.getPointerType(DestType);
11040 break;
11041
11042 case FK_BlockPointer:
11043 DestType = S.Context.getBlockPointerType(DestType);
11044 break;
11045 }
11046
11047 // Finally, we can recurse.
11048 ExprResult calleeResult = Visit(callee);
11049 if (!calleeResult.isUsable()) return ExprError();
11050 call->setCallee(calleeResult.take());
11051
11052 // Bind a temporary if necessary.
11053 return S.MaybeBindToTemporary(call);
11054}
11055
11056ExprResult RebuildUnknownAnyExpr::VisitObjCMessageExpr(ObjCMessageExpr *msg) {
John McCall755d8492011-04-12 00:42:48 +000011057 ObjCMethodDecl *method = msg->getMethodDecl();
11058 assert(method && "__unknown_anytype message without result type?");
John McCall379b5152011-04-11 07:02:50 +000011059
John McCall755d8492011-04-12 00:42:48 +000011060 // Verify that this is a legal result type of a call.
11061 if (DestType->isArrayType() || DestType->isFunctionType()) {
11062 S.Diag(msg->getExprLoc(), diag::err_func_returning_array_function)
11063 << DestType->isFunctionType() << DestType;
11064 return ExprError();
John McCall379b5152011-04-11 07:02:50 +000011065 }
11066
John McCall755d8492011-04-12 00:42:48 +000011067 assert(method->getResultType() == S.Context.UnknownAnyTy);
11068 method->setResultType(DestType);
11069
John McCall379b5152011-04-11 07:02:50 +000011070 // Change the type of the message.
John McCall755d8492011-04-12 00:42:48 +000011071 msg->setType(DestType.getNonReferenceType());
11072 msg->setValueKind(Expr::getValueKindForType(DestType));
John McCall379b5152011-04-11 07:02:50 +000011073
John McCall755d8492011-04-12 00:42:48 +000011074 return S.MaybeBindToTemporary(msg);
John McCall379b5152011-04-11 07:02:50 +000011075}
11076
11077ExprResult RebuildUnknownAnyExpr::VisitImplicitCastExpr(ImplicitCastExpr *ice) {
John McCall755d8492011-04-12 00:42:48 +000011078 // The only case we should ever see here is a function-to-pointer decay.
John McCall379b5152011-04-11 07:02:50 +000011079 assert(ice->getCastKind() == CK_FunctionToPointerDecay);
John McCall379b5152011-04-11 07:02:50 +000011080 assert(ice->getValueKind() == VK_RValue);
11081 assert(ice->getObjectKind() == OK_Ordinary);
11082
John McCall755d8492011-04-12 00:42:48 +000011083 ice->setType(DestType);
11084
John McCall379b5152011-04-11 07:02:50 +000011085 // Rebuild the sub-expression as the pointee (function) type.
11086 DestType = DestType->castAs<PointerType>()->getPointeeType();
11087
11088 ExprResult result = Visit(ice->getSubExpr());
11089 if (!result.isUsable()) return ExprError();
11090
11091 ice->setSubExpr(result.take());
11092 return S.Owned(ice);
11093}
11094
John McCall755d8492011-04-12 00:42:48 +000011095ExprResult RebuildUnknownAnyExpr::resolveDecl(Expr *expr, ValueDecl *decl) {
John McCall379b5152011-04-11 07:02:50 +000011096 ExprValueKind valueKind = VK_LValue;
John McCall379b5152011-04-11 07:02:50 +000011097 QualType type = DestType;
11098
11099 // We know how to make this work for certain kinds of decls:
11100
11101 // - functions
John McCall755d8492011-04-12 00:42:48 +000011102 if (FunctionDecl *fn = dyn_cast<FunctionDecl>(decl)) {
John McCall379b5152011-04-11 07:02:50 +000011103 // This is true because FunctionDecls must always have function
11104 // type, so we can't be resolving the entire thing at once.
11105 assert(type->isFunctionType());
11106
John McCallf5307512011-04-27 00:36:17 +000011107 if (CXXMethodDecl *method = dyn_cast<CXXMethodDecl>(fn))
11108 if (method->isInstance()) {
11109 valueKind = VK_RValue;
11110 type = S.Context.BoundMemberTy;
11111 }
11112
John McCall379b5152011-04-11 07:02:50 +000011113 // Function references aren't l-values in C.
11114 if (!S.getLangOptions().CPlusPlus)
11115 valueKind = VK_RValue;
11116
11117 // - variables
11118 } else if (isa<VarDecl>(decl)) {
John McCall755d8492011-04-12 00:42:48 +000011119 if (const ReferenceType *refTy = type->getAs<ReferenceType>()) {
11120 type = refTy->getPointeeType();
John McCall379b5152011-04-11 07:02:50 +000011121 } else if (type->isFunctionType()) {
John McCall755d8492011-04-12 00:42:48 +000011122 S.Diag(expr->getExprLoc(), diag::err_unknown_any_var_function_type)
11123 << decl << expr->getSourceRange();
11124 return ExprError();
John McCall379b5152011-04-11 07:02:50 +000011125 }
11126
11127 // - nothing else
11128 } else {
11129 S.Diag(expr->getExprLoc(), diag::err_unsupported_unknown_any_decl)
11130 << decl << expr->getSourceRange();
11131 return ExprError();
11132 }
11133
John McCall755d8492011-04-12 00:42:48 +000011134 decl->setType(DestType);
11135 expr->setType(type);
11136 expr->setValueKind(valueKind);
11137 return S.Owned(expr);
John McCall379b5152011-04-11 07:02:50 +000011138}
11139
John McCall1de4d4e2011-04-07 08:22:57 +000011140/// Check a cast of an unknown-any type. We intentionally only
11141/// trigger this for C-style casts.
John Wiegley429bb272011-04-08 18:41:53 +000011142ExprResult Sema::checkUnknownAnyCast(SourceRange typeRange, QualType castType,
11143 Expr *castExpr, CastKind &castKind,
11144 ExprValueKind &VK, CXXCastPath &path) {
John McCall1de4d4e2011-04-07 08:22:57 +000011145 // Rewrite the casted expression from scratch.
John McCalla5fc4722011-04-09 22:50:59 +000011146 ExprResult result = RebuildUnknownAnyExpr(*this, castType).Visit(castExpr);
11147 if (!result.isUsable()) return ExprError();
John McCall1de4d4e2011-04-07 08:22:57 +000011148
John McCalla5fc4722011-04-09 22:50:59 +000011149 castExpr = result.take();
11150 VK = castExpr->getValueKind();
11151 castKind = CK_NoOp;
11152
11153 return castExpr;
John McCall1de4d4e2011-04-07 08:22:57 +000011154}
11155
11156static ExprResult diagnoseUnknownAnyExpr(Sema &S, Expr *e) {
11157 Expr *orig = e;
John McCall379b5152011-04-11 07:02:50 +000011158 unsigned diagID = diag::err_uncasted_use_of_unknown_any;
John McCall1de4d4e2011-04-07 08:22:57 +000011159 while (true) {
11160 e = e->IgnoreParenImpCasts();
John McCall379b5152011-04-11 07:02:50 +000011161 if (CallExpr *call = dyn_cast<CallExpr>(e)) {
John McCall1de4d4e2011-04-07 08:22:57 +000011162 e = call->getCallee();
John McCall379b5152011-04-11 07:02:50 +000011163 diagID = diag::err_uncasted_call_of_unknown_any;
11164 } else {
John McCall1de4d4e2011-04-07 08:22:57 +000011165 break;
John McCall379b5152011-04-11 07:02:50 +000011166 }
John McCall1de4d4e2011-04-07 08:22:57 +000011167 }
11168
John McCall379b5152011-04-11 07:02:50 +000011169 SourceLocation loc;
11170 NamedDecl *d;
11171 if (DeclRefExpr *ref = dyn_cast<DeclRefExpr>(e)) {
11172 loc = ref->getLocation();
11173 d = ref->getDecl();
11174 } else if (MemberExpr *mem = dyn_cast<MemberExpr>(e)) {
11175 loc = mem->getMemberLoc();
11176 d = mem->getMemberDecl();
11177 } else if (ObjCMessageExpr *msg = dyn_cast<ObjCMessageExpr>(e)) {
11178 diagID = diag::err_uncasted_call_of_unknown_any;
11179 loc = msg->getSelectorLoc();
11180 d = msg->getMethodDecl();
11181 assert(d && "unknown method returning __unknown_any?");
11182 } else {
11183 S.Diag(e->getExprLoc(), diag::err_unsupported_unknown_any_expr)
11184 << e->getSourceRange();
11185 return ExprError();
11186 }
11187
11188 S.Diag(loc, diagID) << d << orig->getSourceRange();
John McCall1de4d4e2011-04-07 08:22:57 +000011189
11190 // Never recoverable.
11191 return ExprError();
11192}
11193
John McCall2a984ca2010-10-12 00:20:44 +000011194/// Check for operands with placeholder types and complain if found.
11195/// Returns true if there was an error and no recovery was possible.
John McCallfb8721c2011-04-10 19:13:55 +000011196ExprResult Sema::CheckPlaceholderExpr(Expr *E) {
John McCall1de4d4e2011-04-07 08:22:57 +000011197 // Placeholder types are always *exactly* the appropriate builtin type.
11198 QualType type = E->getType();
John McCall2a984ca2010-10-12 00:20:44 +000011199
John McCall1de4d4e2011-04-07 08:22:57 +000011200 // Overloaded expressions.
11201 if (type == Context.OverloadTy)
11202 return ResolveAndFixSingleFunctionTemplateSpecialization(E, false, true,
Douglas Gregordb2eae62011-03-16 19:16:25 +000011203 E->getSourceRange(),
John McCall1de4d4e2011-04-07 08:22:57 +000011204 QualType(),
11205 diag::err_ovl_unresolvable);
11206
John McCall864c0412011-04-26 20:42:42 +000011207 // Bound member functions.
11208 if (type == Context.BoundMemberTy) {
11209 Diag(E->getLocStart(), diag::err_invalid_use_of_bound_member_func)
11210 << E->getSourceRange();
11211 return ExprError();
11212 }
11213
John McCall1de4d4e2011-04-07 08:22:57 +000011214 // Expressions of unknown type.
11215 if (type == Context.UnknownAnyTy)
11216 return diagnoseUnknownAnyExpr(*this, E);
11217
11218 assert(!type->isPlaceholderType());
11219 return Owned(E);
John McCall2a984ca2010-10-12 00:20:44 +000011220}
Richard Trieubb9b80c2011-04-21 21:44:26 +000011221
11222bool Sema::CheckCaseExpression(Expr *expr) {
11223 if (expr->isTypeDependent())
11224 return true;
11225 if (expr->isValueDependent() || expr->isIntegerConstantExpr(Context))
11226 return expr->getType()->isIntegralOrEnumerationType();
11227 return false;
11228}