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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);
90 Diag(D->getLocation(), diag::note_unavailable_here) << true;
91 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:
107 if (Message.empty()) {
108 if (!UnknownObjCClass)
109 Diag(Loc, diag::err_unavailable) << D->getDeclName();
110 else
111 Diag(Loc, diag::warn_unavailable_fwdclass_message)
112 << D->getDeclName();
113 }
114 else
115 Diag(Loc, diag::err_unavailable_message)
116 << D->getDeclName() << Message;
117 Diag(D->getLocation(), diag::note_unavailable_here) << 0;
118 break;
119 }
120
Anders Carlsson2127ecc2010-10-22 23:37:08 +0000121 // Warn if this is used but marked unused.
122 if (D->hasAttr<UnusedAttr>())
123 Diag(Loc, diag::warn_used_but_marked_unused) << D->getDeclName();
124
Douglas Gregor48f3bb92009-02-18 21:56:37 +0000125 return false;
Chris Lattner76a642f2009-02-15 22:43:40 +0000126}
127
Douglas Gregor0a0d2b12011-03-23 00:50:03 +0000128/// \brief Retrieve the message suffix that should be added to a
129/// diagnostic complaining about the given function being deleted or
130/// unavailable.
131std::string Sema::getDeletedOrUnavailableSuffix(const FunctionDecl *FD) {
132 // FIXME: C++0x implicitly-deleted special member functions could be
133 // detected here so that we could improve diagnostics to say, e.g.,
134 // "base class 'A' had a deleted copy constructor".
135 if (FD->isDeleted())
136 return std::string();
137
138 std::string Message;
139 if (FD->getAvailability(&Message))
140 return ": " + Message;
141
142 return std::string();
143}
144
Fariborz Jahanian5b530052009-05-13 18:09:35 +0000145/// DiagnoseSentinelCalls - This routine checks on method dispatch calls
Mike Stump1eb44332009-09-09 15:08:12 +0000146/// (and other functions in future), which have been declared with sentinel
Fariborz Jahanian5b530052009-05-13 18:09:35 +0000147/// attribute. It warns if call does not have the sentinel argument.
148///
149void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc,
Mike Stump1eb44332009-09-09 15:08:12 +0000150 Expr **Args, unsigned NumArgs) {
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000151 const SentinelAttr *attr = D->getAttr<SentinelAttr>();
Mike Stump1eb44332009-09-09 15:08:12 +0000152 if (!attr)
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000153 return;
Douglas Gregor92e986e2010-04-22 16:44:27 +0000154
155 // FIXME: In C++0x, if any of the arguments are parameter pack
156 // expansions, we can't check for the sentinel now.
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000157 int sentinelPos = attr->getSentinel();
158 int nullPos = attr->getNullPos();
Mike Stump1eb44332009-09-09 15:08:12 +0000159
Mike Stump390b4cc2009-05-16 07:39:55 +0000160 // FIXME. ObjCMethodDecl and FunctionDecl need be derived from the same common
161 // base class. Then we won't be needing two versions of the same code.
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000162 unsigned int i = 0;
Fariborz Jahanian236673e2009-05-14 18:00:00 +0000163 bool warnNotEnoughArgs = false;
164 int isMethod = 0;
165 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
166 // skip over named parameters.
167 ObjCMethodDecl::param_iterator P, E = MD->param_end();
168 for (P = MD->param_begin(); (P != E && i < NumArgs); ++P) {
169 if (nullPos)
170 --nullPos;
171 else
172 ++i;
173 }
174 warnNotEnoughArgs = (P != E || i >= NumArgs);
175 isMethod = 1;
Mike Stumpac5fc7c2009-08-04 21:02:39 +0000176 } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
Fariborz Jahanian236673e2009-05-14 18:00:00 +0000177 // skip over named parameters.
178 ObjCMethodDecl::param_iterator P, E = FD->param_end();
179 for (P = FD->param_begin(); (P != E && i < NumArgs); ++P) {
180 if (nullPos)
181 --nullPos;
182 else
183 ++i;
184 }
185 warnNotEnoughArgs = (P != E || i >= NumArgs);
Mike Stumpac5fc7c2009-08-04 21:02:39 +0000186 } else if (VarDecl *V = dyn_cast<VarDecl>(D)) {
Fariborz Jahaniandaf04152009-05-15 20:33:25 +0000187 // block or function pointer call.
188 QualType Ty = V->getType();
189 if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) {
Mike Stump1eb44332009-09-09 15:08:12 +0000190 const FunctionType *FT = Ty->isFunctionPointerType()
John McCall183700f2009-09-21 23:43:11 +0000191 ? Ty->getAs<PointerType>()->getPointeeType()->getAs<FunctionType>()
192 : Ty->getAs<BlockPointerType>()->getPointeeType()->getAs<FunctionType>();
Fariborz Jahaniandaf04152009-05-15 20:33:25 +0000193 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FT)) {
194 unsigned NumArgsInProto = Proto->getNumArgs();
195 unsigned k;
196 for (k = 0; (k != NumArgsInProto && i < NumArgs); k++) {
197 if (nullPos)
198 --nullPos;
199 else
200 ++i;
201 }
202 warnNotEnoughArgs = (k != NumArgsInProto || i >= NumArgs);
203 }
204 if (Ty->isBlockPointerType())
205 isMethod = 2;
Mike Stumpac5fc7c2009-08-04 21:02:39 +0000206 } else
Fariborz Jahaniandaf04152009-05-15 20:33:25 +0000207 return;
Mike Stumpac5fc7c2009-08-04 21:02:39 +0000208 } else
Fariborz Jahanian236673e2009-05-14 18:00:00 +0000209 return;
210
211 if (warnNotEnoughArgs) {
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000212 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName();
Fariborz Jahanian236673e2009-05-14 18:00:00 +0000213 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod;
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000214 return;
215 }
216 int sentinel = i;
217 while (sentinelPos > 0 && i < NumArgs-1) {
218 --sentinelPos;
219 ++i;
220 }
221 if (sentinelPos > 0) {
222 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName();
Fariborz Jahanian236673e2009-05-14 18:00:00 +0000223 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod;
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000224 return;
225 }
226 while (i < NumArgs-1) {
227 ++i;
228 ++sentinel;
229 }
230 Expr *sentinelExpr = Args[sentinel];
John McCall8eb662e2010-05-06 23:53:00 +0000231 if (!sentinelExpr) return;
232 if (sentinelExpr->isTypeDependent()) return;
233 if (sentinelExpr->isValueDependent()) return;
Anders Carlsson343e6ff2010-11-05 15:21:33 +0000234
235 // nullptr_t is always treated as null.
236 if (sentinelExpr->getType()->isNullPtrType()) return;
237
Fariborz Jahanian9ccd7252010-07-14 16:37:51 +0000238 if (sentinelExpr->getType()->isAnyPointerType() &&
John McCall8eb662e2010-05-06 23:53:00 +0000239 sentinelExpr->IgnoreParenCasts()->isNullPointerConstant(Context,
240 Expr::NPC_ValueDependentIsNull))
241 return;
242
243 // Unfortunately, __null has type 'int'.
244 if (isa<GNUNullExpr>(sentinelExpr)) return;
245
246 Diag(Loc, diag::warn_missing_sentinel) << isMethod;
247 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod;
Fariborz Jahanian5b530052009-05-13 18:09:35 +0000248}
249
Douglas Gregor4b2d3f72009-02-26 21:00:50 +0000250SourceRange Sema::getExprRange(ExprTy *E) const {
251 Expr *Ex = (Expr *)E;
252 return Ex? Ex->getSourceRange() : SourceRange();
253}
254
Chris Lattnere7a2e912008-07-25 21:10:04 +0000255//===----------------------------------------------------------------------===//
256// Standard Promotions and Conversions
257//===----------------------------------------------------------------------===//
258
Chris Lattnere7a2e912008-07-25 21:10:04 +0000259/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4).
John Wiegley429bb272011-04-08 18:41:53 +0000260ExprResult Sema::DefaultFunctionArrayConversion(Expr *E) {
Chris Lattnere7a2e912008-07-25 21:10:04 +0000261 QualType Ty = E->getType();
262 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type");
263
Chris Lattnere7a2e912008-07-25 21:10:04 +0000264 if (Ty->isFunctionType())
John Wiegley429bb272011-04-08 18:41:53 +0000265 E = ImpCastExprToType(E, Context.getPointerType(Ty),
266 CK_FunctionToPointerDecay).take();
Chris Lattner67d33d82008-07-25 21:33:13 +0000267 else if (Ty->isArrayType()) {
268 // In C90 mode, arrays only promote to pointers if the array expression is
269 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has
270 // type 'array of type' is converted to an expression that has type 'pointer
271 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression
272 // that has type 'array of type' ...". The relevant change is "an lvalue"
273 // (C90) to "an expression" (C99).
Argyrios Kyrtzidisc39a3d72008-09-11 04:25:59 +0000274 //
275 // C++ 4.2p1:
276 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of
277 // T" can be converted to an rvalue of type "pointer to T".
278 //
John McCall7eb0a9e2010-11-24 05:12:34 +0000279 if (getLangOptions().C99 || getLangOptions().CPlusPlus || E->isLValue())
John Wiegley429bb272011-04-08 18:41:53 +0000280 E = ImpCastExprToType(E, Context.getArrayDecayedType(Ty),
281 CK_ArrayToPointerDecay).take();
Chris Lattner67d33d82008-07-25 21:33:13 +0000282 }
John Wiegley429bb272011-04-08 18:41:53 +0000283 return Owned(E);
Chris Lattnere7a2e912008-07-25 21:10:04 +0000284}
285
Argyrios Kyrtzidis8a285ae2011-04-26 17:41:22 +0000286static void CheckForNullPointerDereference(Sema &S, Expr *E) {
287 // Check to see if we are dereferencing a null pointer. If so,
288 // and if not volatile-qualified, this is undefined behavior that the
289 // optimizer will delete, so warn about it. People sometimes try to use this
290 // to get a deterministic trap and are surprised by clang's behavior. This
291 // only handles the pattern "*null", which is a very syntactic check.
292 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E->IgnoreParenCasts()))
293 if (UO->getOpcode() == UO_Deref &&
294 UO->getSubExpr()->IgnoreParenCasts()->
295 isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull) &&
296 !UO->getType().isVolatileQualified()) {
297 S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
298 S.PDiag(diag::warn_indirection_through_null)
299 << UO->getSubExpr()->getSourceRange());
300 S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
301 S.PDiag(diag::note_indirection_through_null));
302 }
303}
304
John Wiegley429bb272011-04-08 18:41:53 +0000305ExprResult Sema::DefaultLvalueConversion(Expr *E) {
John McCall0ae287a2010-12-01 04:43:34 +0000306 // C++ [conv.lval]p1:
307 // A glvalue of a non-function, non-array type T can be
308 // converted to a prvalue.
John Wiegley429bb272011-04-08 18:41:53 +0000309 if (!E->isGLValue()) return Owned(E);
John McCallf6a16482010-12-04 03:47:34 +0000310
John McCall409fa9a2010-12-06 20:48:59 +0000311 QualType T = E->getType();
312 assert(!T.isNull() && "r-value conversion on typeless expression?");
John McCallf6a16482010-12-04 03:47:34 +0000313
John McCall409fa9a2010-12-06 20:48:59 +0000314 // Create a load out of an ObjCProperty l-value, if necessary.
315 if (E->getObjectKind() == OK_ObjCProperty) {
John Wiegley429bb272011-04-08 18:41:53 +0000316 ExprResult Res = ConvertPropertyForRValue(E);
317 if (Res.isInvalid())
318 return Owned(E);
319 E = Res.take();
John McCall409fa9a2010-12-06 20:48:59 +0000320 if (!E->isGLValue())
John Wiegley429bb272011-04-08 18:41:53 +0000321 return Owned(E);
Douglas Gregora873dfc2010-02-03 00:27:59 +0000322 }
John McCall409fa9a2010-12-06 20:48:59 +0000323
324 // We don't want to throw lvalue-to-rvalue casts on top of
325 // expressions of certain types in C++.
326 if (getLangOptions().CPlusPlus &&
327 (E->getType() == Context.OverloadTy ||
328 T->isDependentType() ||
329 T->isRecordType()))
John Wiegley429bb272011-04-08 18:41:53 +0000330 return Owned(E);
John McCall409fa9a2010-12-06 20:48:59 +0000331
332 // The C standard is actually really unclear on this point, and
333 // DR106 tells us what the result should be but not why. It's
334 // generally best to say that void types just doesn't undergo
335 // lvalue-to-rvalue at all. Note that expressions of unqualified
336 // 'void' type are never l-values, but qualified void can be.
337 if (T->isVoidType())
John Wiegley429bb272011-04-08 18:41:53 +0000338 return Owned(E);
John McCall409fa9a2010-12-06 20:48:59 +0000339
Argyrios Kyrtzidis8a285ae2011-04-26 17:41:22 +0000340 CheckForNullPointerDereference(*this, E);
341
John McCall409fa9a2010-12-06 20:48:59 +0000342 // C++ [conv.lval]p1:
343 // [...] If T is a non-class type, the type of the prvalue is the
344 // cv-unqualified version of T. Otherwise, the type of the
345 // rvalue is T.
346 //
347 // C99 6.3.2.1p2:
348 // If the lvalue has qualified type, the value has the unqualified
349 // version of the type of the lvalue; otherwise, the value has the
350 // type of the lvalue.
351 if (T.hasQualifiers())
352 T = T.getUnqualifiedType();
353
Ted Kremenek3aea4da2011-03-01 18:41:00 +0000354 CheckArrayAccess(E);
Ted Kremeneka0125d82011-02-16 01:57:07 +0000355
John Wiegley429bb272011-04-08 18:41:53 +0000356 return Owned(ImplicitCastExpr::Create(Context, T, CK_LValueToRValue,
357 E, 0, VK_RValue));
John McCall409fa9a2010-12-06 20:48:59 +0000358}
359
John Wiegley429bb272011-04-08 18:41:53 +0000360ExprResult Sema::DefaultFunctionArrayLvalueConversion(Expr *E) {
361 ExprResult Res = DefaultFunctionArrayConversion(E);
362 if (Res.isInvalid())
363 return ExprError();
364 Res = DefaultLvalueConversion(Res.take());
365 if (Res.isInvalid())
366 return ExprError();
367 return move(Res);
Douglas Gregora873dfc2010-02-03 00:27:59 +0000368}
369
370
Chris Lattnere7a2e912008-07-25 21:10:04 +0000371/// UsualUnaryConversions - Performs various conversions that are common to most
Mike Stump1eb44332009-09-09 15:08:12 +0000372/// operators (C99 6.3). The conversions of array and function types are
Chris Lattnerfc8f0e12011-04-15 05:22:18 +0000373/// sometimes suppressed. For example, the array->pointer conversion doesn't
Chris Lattnere7a2e912008-07-25 21:10:04 +0000374/// apply if the array is an argument to the sizeof or address (&) operators.
375/// In these instances, this routine should *not* be called.
John Wiegley429bb272011-04-08 18:41:53 +0000376ExprResult Sema::UsualUnaryConversions(Expr *E) {
John McCall0ae287a2010-12-01 04:43:34 +0000377 // First, convert to an r-value.
John Wiegley429bb272011-04-08 18:41:53 +0000378 ExprResult Res = DefaultFunctionArrayLvalueConversion(E);
379 if (Res.isInvalid())
380 return Owned(E);
381 E = Res.take();
John McCall0ae287a2010-12-01 04:43:34 +0000382
383 QualType Ty = E->getType();
Chris Lattnere7a2e912008-07-25 21:10:04 +0000384 assert(!Ty.isNull() && "UsualUnaryConversions - missing type");
John McCall0ae287a2010-12-01 04:43:34 +0000385
386 // Try to perform integral promotions if the object has a theoretically
387 // promotable type.
388 if (Ty->isIntegralOrUnscopedEnumerationType()) {
389 // C99 6.3.1.1p2:
390 //
391 // The following may be used in an expression wherever an int or
392 // unsigned int may be used:
393 // - an object or expression with an integer type whose integer
394 // conversion rank is less than or equal to the rank of int
395 // and unsigned int.
396 // - A bit-field of type _Bool, int, signed int, or unsigned int.
397 //
398 // If an int can represent all values of the original type, the
399 // value is converted to an int; otherwise, it is converted to an
400 // unsigned int. These are called the integer promotions. All
401 // other types are unchanged by the integer promotions.
402
403 QualType PTy = Context.isPromotableBitField(E);
404 if (!PTy.isNull()) {
John Wiegley429bb272011-04-08 18:41:53 +0000405 E = ImpCastExprToType(E, PTy, CK_IntegralCast).take();
406 return Owned(E);
John McCall0ae287a2010-12-01 04:43:34 +0000407 }
408 if (Ty->isPromotableIntegerType()) {
409 QualType PT = Context.getPromotedIntegerType(Ty);
John Wiegley429bb272011-04-08 18:41:53 +0000410 E = ImpCastExprToType(E, PT, CK_IntegralCast).take();
411 return Owned(E);
John McCall0ae287a2010-12-01 04:43:34 +0000412 }
Eli Friedman04e83572009-08-20 04:21:42 +0000413 }
John Wiegley429bb272011-04-08 18:41:53 +0000414 return Owned(E);
Chris Lattnere7a2e912008-07-25 21:10:04 +0000415}
416
Chris Lattner05faf172008-07-25 22:25:12 +0000417/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that
Mike Stump1eb44332009-09-09 15:08:12 +0000418/// do not have a prototype. Arguments that have type float are promoted to
Chris Lattner05faf172008-07-25 22:25:12 +0000419/// double. All other argument types are converted by UsualUnaryConversions().
John Wiegley429bb272011-04-08 18:41:53 +0000420ExprResult Sema::DefaultArgumentPromotion(Expr *E) {
421 QualType Ty = E->getType();
Chris Lattner05faf172008-07-25 22:25:12 +0000422 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type");
Mike Stump1eb44332009-09-09 15:08:12 +0000423
John Wiegley429bb272011-04-08 18:41:53 +0000424 ExprResult Res = UsualUnaryConversions(E);
425 if (Res.isInvalid())
426 return Owned(E);
427 E = Res.take();
John McCall40c29132010-12-06 18:36:11 +0000428
Chris Lattner05faf172008-07-25 22:25:12 +0000429 // If this is a 'float' (CVR qualified or typedef) promote to double.
Chris Lattner40378332010-05-16 04:01:30 +0000430 if (Ty->isSpecificBuiltinType(BuiltinType::Float))
John Wiegley429bb272011-04-08 18:41:53 +0000431 E = ImpCastExprToType(E, Context.DoubleTy, CK_FloatingCast).take();
432
433 return Owned(E);
Chris Lattner05faf172008-07-25 22:25:12 +0000434}
435
Chris Lattner312531a2009-04-12 08:11:20 +0000436/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but
437/// will warn if the resulting type is not a POD type, and rejects ObjC
John Wiegley429bb272011-04-08 18:41:53 +0000438/// interfaces passed by value.
439ExprResult Sema::DefaultVariadicArgumentPromotion(Expr *E, VariadicCallType CT,
Chris Lattner40378332010-05-16 04:01:30 +0000440 FunctionDecl *FDecl) {
John Wiegley429bb272011-04-08 18:41:53 +0000441 ExprResult ExprRes = DefaultArgumentPromotion(E);
442 if (ExprRes.isInvalid())
443 return ExprError();
444 E = ExprRes.take();
Mike Stump1eb44332009-09-09 15:08:12 +0000445
Chris Lattner40378332010-05-16 04:01:30 +0000446 // __builtin_va_start takes the second argument as a "varargs" argument, but
447 // it doesn't actually do anything with it. It doesn't need to be non-pod
448 // etc.
449 if (FDecl && FDecl->getBuiltinID() == Builtin::BI__builtin_va_start)
John Wiegley429bb272011-04-08 18:41:53 +0000450 return Owned(E);
Chris Lattner40378332010-05-16 04:01:30 +0000451
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000452 // Don't allow one to pass an Objective-C interface to a vararg.
John Wiegley429bb272011-04-08 18:41:53 +0000453 if (E->getType()->isObjCObjectType() &&
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000454 DiagRuntimeBehavior(E->getLocStart(), 0,
455 PDiag(diag::err_cannot_pass_objc_interface_to_vararg)
456 << E->getType() << CT))
John Wiegley429bb272011-04-08 18:41:53 +0000457 return ExprError();
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000458
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000459 if (!E->getType()->isPODType()) {
460 // C++0x [expr.call]p7:
461 // Passing a potentially-evaluated argument of class type (Clause 9)
462 // having a non-trivial copy constructor, a non-trivial move constructor,
463 // or a non-trivial destructor, with no corresponding parameter,
464 // is conditionally-supported with implementation-defined semantics.
465 bool TrivialEnough = false;
466 if (getLangOptions().CPlusPlus0x && !E->getType()->isDependentType()) {
467 if (CXXRecordDecl *Record = E->getType()->getAsCXXRecordDecl()) {
468 if (Record->hasTrivialCopyConstructor() &&
469 Record->hasTrivialMoveConstructor() &&
470 Record->hasTrivialDestructor())
471 TrivialEnough = true;
472 }
473 }
474
475 if (TrivialEnough) {
476 // Nothing to diagnose. This is okay.
477 } else if (DiagRuntimeBehavior(E->getLocStart(), 0,
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +0000478 PDiag(diag::warn_cannot_pass_non_pod_arg_to_vararg)
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000479 << getLangOptions().CPlusPlus0x << E->getType()
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000480 << CT)) {
481 // Turn this into a trap.
482 CXXScopeSpec SS;
483 UnqualifiedId Name;
484 Name.setIdentifier(PP.getIdentifierInfo("__builtin_trap"),
485 E->getLocStart());
486 ExprResult TrapFn = ActOnIdExpression(TUScope, SS, Name, true, false);
487 if (TrapFn.isInvalid())
488 return ExprError();
489
490 ExprResult Call = ActOnCallExpr(TUScope, TrapFn.get(), E->getLocStart(),
491 MultiExprArg(), E->getLocEnd());
492 if (Call.isInvalid())
493 return ExprError();
494
495 ExprResult Comma = ActOnBinOp(TUScope, E->getLocStart(), tok::comma,
496 Call.get(), E);
497 if (Comma.isInvalid())
498 return ExprError();
499
500 E = Comma.get();
501 }
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000502 }
503
John Wiegley429bb272011-04-08 18:41:53 +0000504 return Owned(E);
Anders Carlssondce5e2c2009-01-16 16:48:51 +0000505}
506
Chris Lattnere7a2e912008-07-25 21:10:04 +0000507/// UsualArithmeticConversions - Performs various conversions that are common to
508/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this
Mike Stump1eb44332009-09-09 15:08:12 +0000509/// routine returns the first non-arithmetic type found. The client is
Chris Lattnere7a2e912008-07-25 21:10:04 +0000510/// responsible for emitting appropriate error diagnostics.
511/// FIXME: verify the conversion rules for "complex int" are consistent with
512/// GCC.
John Wiegley429bb272011-04-08 18:41:53 +0000513QualType Sema::UsualArithmeticConversions(ExprResult &lhsExpr, ExprResult &rhsExpr,
Chris Lattnere7a2e912008-07-25 21:10:04 +0000514 bool isCompAssign) {
John Wiegley429bb272011-04-08 18:41:53 +0000515 if (!isCompAssign) {
516 lhsExpr = UsualUnaryConversions(lhsExpr.take());
517 if (lhsExpr.isInvalid())
518 return QualType();
519 }
Eli Friedmanab3a8522009-03-28 01:22:36 +0000520
John Wiegley429bb272011-04-08 18:41:53 +0000521 rhsExpr = UsualUnaryConversions(rhsExpr.take());
522 if (rhsExpr.isInvalid())
523 return QualType();
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000524
Mike Stump1eb44332009-09-09 15:08:12 +0000525 // For conversion purposes, we ignore any qualifiers.
Chris Lattnere7a2e912008-07-25 21:10:04 +0000526 // For example, "const float" and "float" are equivalent.
Chris Lattnerb77792e2008-07-26 22:17:49 +0000527 QualType lhs =
John Wiegley429bb272011-04-08 18:41:53 +0000528 Context.getCanonicalType(lhsExpr.get()->getType()).getUnqualifiedType();
Mike Stump1eb44332009-09-09 15:08:12 +0000529 QualType rhs =
John Wiegley429bb272011-04-08 18:41:53 +0000530 Context.getCanonicalType(rhsExpr.get()->getType()).getUnqualifiedType();
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000531
532 // If both types are identical, no conversion is needed.
533 if (lhs == rhs)
534 return lhs;
535
536 // If either side is a non-arithmetic type (e.g. a pointer), we are done.
537 // The caller can deal with this (e.g. pointer + int).
538 if (!lhs->isArithmeticType() || !rhs->isArithmeticType())
539 return lhs;
540
John McCallcf33b242010-11-13 08:17:45 +0000541 // Apply unary and bitfield promotions to the LHS's type.
542 QualType lhs_unpromoted = lhs;
543 if (lhs->isPromotableIntegerType())
544 lhs = Context.getPromotedIntegerType(lhs);
John Wiegley429bb272011-04-08 18:41:53 +0000545 QualType LHSBitfieldPromoteTy = Context.isPromotableBitField(lhsExpr.get());
Douglas Gregor2d833e32009-05-02 00:36:19 +0000546 if (!LHSBitfieldPromoteTy.isNull())
547 lhs = LHSBitfieldPromoteTy;
John McCallcf33b242010-11-13 08:17:45 +0000548 if (lhs != lhs_unpromoted && !isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000549 lhsExpr = ImpCastExprToType(lhsExpr.take(), lhs, CK_IntegralCast);
Douglas Gregor2d833e32009-05-02 00:36:19 +0000550
John McCallcf33b242010-11-13 08:17:45 +0000551 // If both types are identical, no conversion is needed.
552 if (lhs == rhs)
553 return lhs;
554
555 // At this point, we have two different arithmetic types.
556
557 // Handle complex types first (C99 6.3.1.8p1).
558 bool LHSComplexFloat = lhs->isComplexType();
559 bool RHSComplexFloat = rhs->isComplexType();
560 if (LHSComplexFloat || RHSComplexFloat) {
561 // if we have an integer operand, the result is the complex type.
562
John McCall2bb5d002010-11-13 09:02:35 +0000563 if (!RHSComplexFloat && !rhs->isRealFloatingType()) {
564 if (rhs->isIntegerType()) {
565 QualType fp = cast<ComplexType>(lhs)->getElementType();
John Wiegley429bb272011-04-08 18:41:53 +0000566 rhsExpr = ImpCastExprToType(rhsExpr.take(), fp, CK_IntegralToFloating);
567 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_FloatingRealToComplex);
John McCall2bb5d002010-11-13 09:02:35 +0000568 } else {
569 assert(rhs->isComplexIntegerType());
John Wiegley429bb272011-04-08 18:41:53 +0000570 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralComplexToFloatingComplex);
John McCall2bb5d002010-11-13 09:02:35 +0000571 }
John McCallcf33b242010-11-13 08:17:45 +0000572 return lhs;
573 }
574
John McCall2bb5d002010-11-13 09:02:35 +0000575 if (!LHSComplexFloat && !lhs->isRealFloatingType()) {
576 if (!isCompAssign) {
577 // int -> float -> _Complex float
578 if (lhs->isIntegerType()) {
579 QualType fp = cast<ComplexType>(rhs)->getElementType();
John Wiegley429bb272011-04-08 18:41:53 +0000580 lhsExpr = ImpCastExprToType(lhsExpr.take(), fp, CK_IntegralToFloating);
581 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_FloatingRealToComplex);
John McCall2bb5d002010-11-13 09:02:35 +0000582 } else {
583 assert(lhs->isComplexIntegerType());
John Wiegley429bb272011-04-08 18:41:53 +0000584 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_IntegralComplexToFloatingComplex);
John McCall2bb5d002010-11-13 09:02:35 +0000585 }
586 }
John McCallcf33b242010-11-13 08:17:45 +0000587 return rhs;
588 }
589
590 // This handles complex/complex, complex/float, or float/complex.
591 // When both operands are complex, the shorter operand is converted to the
592 // type of the longer, and that is the type of the result. This corresponds
593 // to what is done when combining two real floating-point operands.
594 // The fun begins when size promotion occur across type domains.
595 // From H&S 6.3.4: When one operand is complex and the other is a real
596 // floating-point type, the less precise type is converted, within it's
597 // real or complex domain, to the precision of the other type. For example,
598 // when combining a "long double" with a "double _Complex", the
599 // "double _Complex" is promoted to "long double _Complex".
600 int order = Context.getFloatingTypeOrder(lhs, rhs);
601
602 // If both are complex, just cast to the more precise type.
603 if (LHSComplexFloat && RHSComplexFloat) {
604 if (order > 0) {
605 // _Complex float -> _Complex double
John Wiegley429bb272011-04-08 18:41:53 +0000606 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_FloatingComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000607 return lhs;
608
609 } else if (order < 0) {
610 // _Complex float -> _Complex double
611 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000612 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_FloatingComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000613 return rhs;
614 }
615 return lhs;
616 }
617
618 // If just the LHS is complex, the RHS needs to be converted,
619 // and the LHS might need to be promoted.
620 if (LHSComplexFloat) {
621 if (order > 0) { // LHS is wider
622 // float -> _Complex double
John McCall2bb5d002010-11-13 09:02:35 +0000623 QualType fp = cast<ComplexType>(lhs)->getElementType();
John Wiegley429bb272011-04-08 18:41:53 +0000624 rhsExpr = ImpCastExprToType(rhsExpr.take(), fp, CK_FloatingCast);
625 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000626 return lhs;
627 }
628
629 // RHS is at least as wide. Find its corresponding complex type.
630 QualType result = (order == 0 ? lhs : Context.getComplexType(rhs));
631
632 // double -> _Complex double
John Wiegley429bb272011-04-08 18:41:53 +0000633 rhsExpr = ImpCastExprToType(rhsExpr.take(), result, CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000634
635 // _Complex float -> _Complex double
636 if (!isCompAssign && order < 0)
John Wiegley429bb272011-04-08 18:41:53 +0000637 lhsExpr = ImpCastExprToType(lhsExpr.take(), result, CK_FloatingComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000638
639 return result;
640 }
641
642 // Just the RHS is complex, so the LHS needs to be converted
643 // and the RHS might need to be promoted.
644 assert(RHSComplexFloat);
645
646 if (order < 0) { // RHS is wider
647 // float -> _Complex double
John McCall2bb5d002010-11-13 09:02:35 +0000648 if (!isCompAssign) {
Argyrios Kyrtzidise1889332011-01-18 18:49:33 +0000649 QualType fp = cast<ComplexType>(rhs)->getElementType();
John Wiegley429bb272011-04-08 18:41:53 +0000650 lhsExpr = ImpCastExprToType(lhsExpr.take(), fp, CK_FloatingCast);
651 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_FloatingRealToComplex);
John McCall2bb5d002010-11-13 09:02:35 +0000652 }
John McCallcf33b242010-11-13 08:17:45 +0000653 return rhs;
654 }
655
656 // LHS is at least as wide. Find its corresponding complex type.
657 QualType result = (order == 0 ? rhs : Context.getComplexType(lhs));
658
659 // double -> _Complex double
660 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000661 lhsExpr = ImpCastExprToType(lhsExpr.take(), result, CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000662
663 // _Complex float -> _Complex double
664 if (order > 0)
John Wiegley429bb272011-04-08 18:41:53 +0000665 rhsExpr = ImpCastExprToType(rhsExpr.take(), result, CK_FloatingComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000666
667 return result;
668 }
669
670 // Now handle "real" floating types (i.e. float, double, long double).
671 bool LHSFloat = lhs->isRealFloatingType();
672 bool RHSFloat = rhs->isRealFloatingType();
673 if (LHSFloat || RHSFloat) {
674 // If we have two real floating types, convert the smaller operand
675 // to the bigger result.
676 if (LHSFloat && RHSFloat) {
677 int order = Context.getFloatingTypeOrder(lhs, rhs);
678 if (order > 0) {
John Wiegley429bb272011-04-08 18:41:53 +0000679 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_FloatingCast);
John McCallcf33b242010-11-13 08:17:45 +0000680 return lhs;
681 }
682
683 assert(order < 0 && "illegal float comparison");
684 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000685 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_FloatingCast);
John McCallcf33b242010-11-13 08:17:45 +0000686 return rhs;
687 }
688
689 // If we have an integer operand, the result is the real floating type.
690 if (LHSFloat) {
691 if (rhs->isIntegerType()) {
692 // Convert rhs to the lhs floating point type.
John Wiegley429bb272011-04-08 18:41:53 +0000693 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralToFloating);
John McCallcf33b242010-11-13 08:17:45 +0000694 return lhs;
695 }
696
697 // Convert both sides to the appropriate complex float.
698 assert(rhs->isComplexIntegerType());
699 QualType result = Context.getComplexType(lhs);
700
701 // _Complex int -> _Complex float
John Wiegley429bb272011-04-08 18:41:53 +0000702 rhsExpr = ImpCastExprToType(rhsExpr.take(), result, CK_IntegralComplexToFloatingComplex);
John McCallcf33b242010-11-13 08:17:45 +0000703
704 // float -> _Complex float
705 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000706 lhsExpr = ImpCastExprToType(lhsExpr.take(), result, CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000707
708 return result;
709 }
710
711 assert(RHSFloat);
712 if (lhs->isIntegerType()) {
713 // Convert lhs to the rhs floating point type.
714 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000715 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_IntegralToFloating);
John McCallcf33b242010-11-13 08:17:45 +0000716 return rhs;
717 }
718
719 // Convert both sides to the appropriate complex float.
720 assert(lhs->isComplexIntegerType());
721 QualType result = Context.getComplexType(rhs);
722
723 // _Complex int -> _Complex float
724 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000725 lhsExpr = ImpCastExprToType(lhsExpr.take(), result, CK_IntegralComplexToFloatingComplex);
John McCallcf33b242010-11-13 08:17:45 +0000726
727 // float -> _Complex float
John Wiegley429bb272011-04-08 18:41:53 +0000728 rhsExpr = ImpCastExprToType(rhsExpr.take(), result, CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000729
730 return result;
731 }
732
733 // Handle GCC complex int extension.
734 // FIXME: if the operands are (int, _Complex long), we currently
735 // don't promote the complex. Also, signedness?
736 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType();
737 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType();
738 if (lhsComplexInt && rhsComplexInt) {
739 int order = Context.getIntegerTypeOrder(lhsComplexInt->getElementType(),
740 rhsComplexInt->getElementType());
741 assert(order && "inequal types with equal element ordering");
742 if (order > 0) {
743 // _Complex int -> _Complex long
John Wiegley429bb272011-04-08 18:41:53 +0000744 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000745 return lhs;
746 }
747
748 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000749 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_IntegralComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000750 return rhs;
751 } else if (lhsComplexInt) {
752 // int -> _Complex int
John Wiegley429bb272011-04-08 18:41:53 +0000753 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000754 return lhs;
755 } else if (rhsComplexInt) {
756 // int -> _Complex int
757 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000758 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_IntegralRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000759 return rhs;
760 }
761
762 // Finally, we have two differing integer types.
763 // The rules for this case are in C99 6.3.1.8
764 int compare = Context.getIntegerTypeOrder(lhs, rhs);
765 bool lhsSigned = lhs->hasSignedIntegerRepresentation(),
766 rhsSigned = rhs->hasSignedIntegerRepresentation();
767 if (lhsSigned == rhsSigned) {
768 // Same signedness; use the higher-ranked type
769 if (compare >= 0) {
John Wiegley429bb272011-04-08 18:41:53 +0000770 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000771 return lhs;
772 } else if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000773 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000774 return rhs;
775 } else if (compare != (lhsSigned ? 1 : -1)) {
776 // The unsigned type has greater than or equal rank to the
777 // signed type, so use the unsigned type
778 if (rhsSigned) {
John Wiegley429bb272011-04-08 18:41:53 +0000779 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000780 return lhs;
781 } else if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000782 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000783 return rhs;
784 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) {
785 // The two types are different widths; if we are here, that
786 // means the signed type is larger than the unsigned type, so
787 // use the signed type.
788 if (lhsSigned) {
John Wiegley429bb272011-04-08 18:41:53 +0000789 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000790 return lhs;
791 } else if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000792 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000793 return rhs;
794 } else {
795 // The signed type is higher-ranked than the unsigned type,
796 // but isn't actually any bigger (like unsigned int and long
797 // on most 32-bit systems). Use the unsigned type corresponding
798 // to the signed type.
799 QualType result =
800 Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs);
John Wiegley429bb272011-04-08 18:41:53 +0000801 rhsExpr = ImpCastExprToType(rhsExpr.take(), result, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000802 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000803 lhsExpr = ImpCastExprToType(lhsExpr.take(), result, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000804 return result;
805 }
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000806}
807
Chris Lattnere7a2e912008-07-25 21:10:04 +0000808//===----------------------------------------------------------------------===//
809// Semantic Analysis for various Expression Types
810//===----------------------------------------------------------------------===//
811
812
Peter Collingbournef111d932011-04-15 00:35:48 +0000813ExprResult
814Sema::ActOnGenericSelectionExpr(SourceLocation KeyLoc,
815 SourceLocation DefaultLoc,
816 SourceLocation RParenLoc,
817 Expr *ControllingExpr,
818 MultiTypeArg types,
819 MultiExprArg exprs) {
820 unsigned NumAssocs = types.size();
821 assert(NumAssocs == exprs.size());
822
823 ParsedType *ParsedTypes = types.release();
824 Expr **Exprs = exprs.release();
825
826 TypeSourceInfo **Types = new TypeSourceInfo*[NumAssocs];
827 for (unsigned i = 0; i < NumAssocs; ++i) {
828 if (ParsedTypes[i])
829 (void) GetTypeFromParser(ParsedTypes[i], &Types[i]);
830 else
831 Types[i] = 0;
832 }
833
834 ExprResult ER = CreateGenericSelectionExpr(KeyLoc, DefaultLoc, RParenLoc,
835 ControllingExpr, Types, Exprs,
836 NumAssocs);
Benjamin Kramer5bf47f72011-04-15 11:21:57 +0000837 delete [] Types;
Peter Collingbournef111d932011-04-15 00:35:48 +0000838 return ER;
839}
840
841ExprResult
842Sema::CreateGenericSelectionExpr(SourceLocation KeyLoc,
843 SourceLocation DefaultLoc,
844 SourceLocation RParenLoc,
845 Expr *ControllingExpr,
846 TypeSourceInfo **Types,
847 Expr **Exprs,
848 unsigned NumAssocs) {
849 bool TypeErrorFound = false,
850 IsResultDependent = ControllingExpr->isTypeDependent(),
851 ContainsUnexpandedParameterPack
852 = ControllingExpr->containsUnexpandedParameterPack();
853
854 for (unsigned i = 0; i < NumAssocs; ++i) {
855 if (Exprs[i]->containsUnexpandedParameterPack())
856 ContainsUnexpandedParameterPack = true;
857
858 if (Types[i]) {
859 if (Types[i]->getType()->containsUnexpandedParameterPack())
860 ContainsUnexpandedParameterPack = true;
861
862 if (Types[i]->getType()->isDependentType()) {
863 IsResultDependent = true;
864 } else {
865 // C1X 6.5.1.1p2 "The type name in a generic association shall specify a
866 // complete object type other than a variably modified type."
867 unsigned D = 0;
868 if (Types[i]->getType()->isIncompleteType())
869 D = diag::err_assoc_type_incomplete;
870 else if (!Types[i]->getType()->isObjectType())
871 D = diag::err_assoc_type_nonobject;
872 else if (Types[i]->getType()->isVariablyModifiedType())
873 D = diag::err_assoc_type_variably_modified;
874
875 if (D != 0) {
876 Diag(Types[i]->getTypeLoc().getBeginLoc(), D)
877 << Types[i]->getTypeLoc().getSourceRange()
878 << Types[i]->getType();
879 TypeErrorFound = true;
880 }
881
882 // C1X 6.5.1.1p2 "No two generic associations in the same generic
883 // selection shall specify compatible types."
884 for (unsigned j = i+1; j < NumAssocs; ++j)
885 if (Types[j] && !Types[j]->getType()->isDependentType() &&
886 Context.typesAreCompatible(Types[i]->getType(),
887 Types[j]->getType())) {
888 Diag(Types[j]->getTypeLoc().getBeginLoc(),
889 diag::err_assoc_compatible_types)
890 << Types[j]->getTypeLoc().getSourceRange()
891 << Types[j]->getType()
892 << Types[i]->getType();
893 Diag(Types[i]->getTypeLoc().getBeginLoc(),
894 diag::note_compat_assoc)
895 << Types[i]->getTypeLoc().getSourceRange()
896 << Types[i]->getType();
897 TypeErrorFound = true;
898 }
899 }
900 }
901 }
902 if (TypeErrorFound)
903 return ExprError();
904
905 // If we determined that the generic selection is result-dependent, don't
906 // try to compute the result expression.
907 if (IsResultDependent)
908 return Owned(new (Context) GenericSelectionExpr(
909 Context, KeyLoc, ControllingExpr,
910 Types, Exprs, NumAssocs, DefaultLoc,
911 RParenLoc, ContainsUnexpandedParameterPack));
912
913 llvm::SmallVector<unsigned, 1> CompatIndices;
914 unsigned DefaultIndex = -1U;
915 for (unsigned i = 0; i < NumAssocs; ++i) {
916 if (!Types[i])
917 DefaultIndex = i;
918 else if (Context.typesAreCompatible(ControllingExpr->getType(),
919 Types[i]->getType()))
920 CompatIndices.push_back(i);
921 }
922
923 // C1X 6.5.1.1p2 "The controlling expression of a generic selection shall have
924 // type compatible with at most one of the types named in its generic
925 // association list."
926 if (CompatIndices.size() > 1) {
927 // We strip parens here because the controlling expression is typically
928 // parenthesized in macro definitions.
929 ControllingExpr = ControllingExpr->IgnoreParens();
930 Diag(ControllingExpr->getLocStart(), diag::err_generic_sel_multi_match)
931 << ControllingExpr->getSourceRange() << ControllingExpr->getType()
932 << (unsigned) CompatIndices.size();
933 for (llvm::SmallVector<unsigned, 1>::iterator I = CompatIndices.begin(),
934 E = CompatIndices.end(); I != E; ++I) {
935 Diag(Types[*I]->getTypeLoc().getBeginLoc(),
936 diag::note_compat_assoc)
937 << Types[*I]->getTypeLoc().getSourceRange()
938 << Types[*I]->getType();
939 }
940 return ExprError();
941 }
942
943 // C1X 6.5.1.1p2 "If a generic selection has no default generic association,
944 // its controlling expression shall have type compatible with exactly one of
945 // the types named in its generic association list."
946 if (DefaultIndex == -1U && CompatIndices.size() == 0) {
947 // We strip parens here because the controlling expression is typically
948 // parenthesized in macro definitions.
949 ControllingExpr = ControllingExpr->IgnoreParens();
950 Diag(ControllingExpr->getLocStart(), diag::err_generic_sel_no_match)
951 << ControllingExpr->getSourceRange() << ControllingExpr->getType();
952 return ExprError();
953 }
954
955 // C1X 6.5.1.1p3 "If a generic selection has a generic association with a
956 // type name that is compatible with the type of the controlling expression,
957 // then the result expression of the generic selection is the expression
958 // in that generic association. Otherwise, the result expression of the
959 // generic selection is the expression in the default generic association."
960 unsigned ResultIndex =
961 CompatIndices.size() ? CompatIndices[0] : DefaultIndex;
962
963 return Owned(new (Context) GenericSelectionExpr(
964 Context, KeyLoc, ControllingExpr,
965 Types, Exprs, NumAssocs, DefaultLoc,
966 RParenLoc, ContainsUnexpandedParameterPack,
967 ResultIndex));
968}
969
Steve Narofff69936d2007-09-16 03:34:24 +0000970/// ActOnStringLiteral - The specified tokens were lexed as pasted string
Reid Spencer5f016e22007-07-11 17:01:13 +0000971/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string
972/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from
973/// multiple tokens. However, the common case is that StringToks points to one
974/// string.
Sebastian Redlcd965b92009-01-18 18:53:16 +0000975///
John McCall60d7b3a2010-08-24 06:29:42 +0000976ExprResult
Sean Hunt6cf75022010-08-30 17:47:05 +0000977Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000978 assert(NumStringToks && "Must have at least one string!");
979
Chris Lattnerbbee00b2009-01-16 18:51:42 +0000980 StringLiteralParser Literal(StringToks, NumStringToks, PP);
Reid Spencer5f016e22007-07-11 17:01:13 +0000981 if (Literal.hadError)
Sebastian Redlcd965b92009-01-18 18:53:16 +0000982 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +0000983
984 llvm::SmallVector<SourceLocation, 4> StringTokLocs;
985 for (unsigned i = 0; i != NumStringToks; ++i)
986 StringTokLocs.push_back(StringToks[i].getLocation());
Chris Lattnera7ad98f2008-02-11 00:02:17 +0000987
Chris Lattnera7ad98f2008-02-11 00:02:17 +0000988 QualType StrTy = Context.CharTy;
Anders Carlsson96b4adc2011-04-06 18:42:48 +0000989 if (Literal.AnyWide)
990 StrTy = Context.getWCharType();
991 else if (Literal.Pascal)
992 StrTy = Context.UnsignedCharTy;
Douglas Gregor77a52232008-09-12 00:47:35 +0000993
994 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
Chris Lattner7dc480f2010-06-15 18:05:34 +0000995 if (getLangOptions().CPlusPlus || getLangOptions().ConstStrings)
Douglas Gregor77a52232008-09-12 00:47:35 +0000996 StrTy.addConst();
Sebastian Redlcd965b92009-01-18 18:53:16 +0000997
Chris Lattnera7ad98f2008-02-11 00:02:17 +0000998 // Get an array type for the string, according to C99 6.4.5. This includes
999 // the nul terminator character as well as the string length for pascal
1000 // strings.
1001 StrTy = Context.getConstantArrayType(StrTy,
Chris Lattnerdbb1ecc2009-02-26 23:01:51 +00001002 llvm::APInt(32, Literal.GetNumStringChars()+1),
Chris Lattnera7ad98f2008-02-11 00:02:17 +00001003 ArrayType::Normal, 0);
Mike Stump1eb44332009-09-09 15:08:12 +00001004
Reid Spencer5f016e22007-07-11 17:01:13 +00001005 // Pass &StringTokLocs[0], StringTokLocs.size() to factory!
Sean Hunt6cf75022010-08-30 17:47:05 +00001006 return Owned(StringLiteral::Create(Context, Literal.GetString(),
1007 Literal.GetStringLength(),
Anders Carlsson3e2193c2011-04-14 00:40:03 +00001008 Literal.AnyWide, Literal.Pascal, StrTy,
Sean Hunt6cf75022010-08-30 17:47:05 +00001009 &StringTokLocs[0],
1010 StringTokLocs.size()));
Reid Spencer5f016e22007-07-11 17:01:13 +00001011}
1012
John McCall469a1eb2011-02-02 13:00:07 +00001013enum CaptureResult {
1014 /// No capture is required.
1015 CR_NoCapture,
1016
1017 /// A capture is required.
1018 CR_Capture,
1019
John McCall6b5a61b2011-02-07 10:33:21 +00001020 /// A by-ref capture is required.
1021 CR_CaptureByRef,
1022
John McCall469a1eb2011-02-02 13:00:07 +00001023 /// An error occurred when trying to capture the given variable.
1024 CR_Error
1025};
1026
1027/// Diagnose an uncapturable value reference.
Chris Lattner639e2d32008-10-20 05:16:36 +00001028///
John McCall469a1eb2011-02-02 13:00:07 +00001029/// \param var - the variable referenced
1030/// \param DC - the context which we couldn't capture through
1031static CaptureResult
John McCall6b5a61b2011-02-07 10:33:21 +00001032diagnoseUncapturableValueReference(Sema &S, SourceLocation loc,
John McCall469a1eb2011-02-02 13:00:07 +00001033 VarDecl *var, DeclContext *DC) {
1034 switch (S.ExprEvalContexts.back().Context) {
1035 case Sema::Unevaluated:
1036 // The argument will never be evaluated, so don't complain.
1037 return CR_NoCapture;
Mike Stump1eb44332009-09-09 15:08:12 +00001038
John McCall469a1eb2011-02-02 13:00:07 +00001039 case Sema::PotentiallyEvaluated:
1040 case Sema::PotentiallyEvaluatedIfUsed:
1041 break;
Chris Lattner639e2d32008-10-20 05:16:36 +00001042
John McCall469a1eb2011-02-02 13:00:07 +00001043 case Sema::PotentiallyPotentiallyEvaluated:
1044 // FIXME: delay these!
1045 break;
Chris Lattner17f3a6d2009-04-21 22:26:47 +00001046 }
Mike Stump1eb44332009-09-09 15:08:12 +00001047
John McCall469a1eb2011-02-02 13:00:07 +00001048 // Don't diagnose about capture if we're not actually in code right
1049 // now; in general, there are more appropriate places that will
1050 // diagnose this.
1051 if (!S.CurContext->isFunctionOrMethod()) return CR_NoCapture;
1052
John McCall4f38f412011-03-22 23:15:50 +00001053 // Certain madnesses can happen with parameter declarations, which
1054 // we want to ignore.
1055 if (isa<ParmVarDecl>(var)) {
1056 // - If the parameter still belongs to the translation unit, then
1057 // we're actually just using one parameter in the declaration of
1058 // the next. This is useful in e.g. VLAs.
1059 if (isa<TranslationUnitDecl>(var->getDeclContext()))
1060 return CR_NoCapture;
1061
1062 // - This particular madness can happen in ill-formed default
1063 // arguments; claim it's okay and let downstream code handle it.
1064 if (S.CurContext == var->getDeclContext()->getParent())
1065 return CR_NoCapture;
1066 }
John McCall469a1eb2011-02-02 13:00:07 +00001067
1068 DeclarationName functionName;
1069 if (FunctionDecl *fn = dyn_cast<FunctionDecl>(var->getDeclContext()))
1070 functionName = fn->getDeclName();
1071 // FIXME: variable from enclosing block that we couldn't capture from!
1072
1073 S.Diag(loc, diag::err_reference_to_local_var_in_enclosing_function)
1074 << var->getIdentifier() << functionName;
1075 S.Diag(var->getLocation(), diag::note_local_variable_declared_here)
1076 << var->getIdentifier();
1077
1078 return CR_Error;
Mike Stump1eb44332009-09-09 15:08:12 +00001079}
1080
John McCall6b5a61b2011-02-07 10:33:21 +00001081/// There is a well-formed capture at a particular scope level;
1082/// propagate it through all the nested blocks.
1083static CaptureResult propagateCapture(Sema &S, unsigned validScopeIndex,
1084 const BlockDecl::Capture &capture) {
1085 VarDecl *var = capture.getVariable();
1086
1087 // Update all the inner blocks with the capture information.
1088 for (unsigned i = validScopeIndex + 1, e = S.FunctionScopes.size();
1089 i != e; ++i) {
1090 BlockScopeInfo *innerBlock = cast<BlockScopeInfo>(S.FunctionScopes[i]);
1091 innerBlock->Captures.push_back(
1092 BlockDecl::Capture(capture.getVariable(), capture.isByRef(),
1093 /*nested*/ true, capture.getCopyExpr()));
1094 innerBlock->CaptureMap[var] = innerBlock->Captures.size(); // +1
1095 }
1096
1097 return capture.isByRef() ? CR_CaptureByRef : CR_Capture;
1098}
1099
1100/// shouldCaptureValueReference - Determine if a reference to the
John McCall469a1eb2011-02-02 13:00:07 +00001101/// given value in the current context requires a variable capture.
1102///
1103/// This also keeps the captures set in the BlockScopeInfo records
1104/// up-to-date.
John McCall6b5a61b2011-02-07 10:33:21 +00001105static CaptureResult shouldCaptureValueReference(Sema &S, SourceLocation loc,
John McCall469a1eb2011-02-02 13:00:07 +00001106 ValueDecl *value) {
1107 // Only variables ever require capture.
1108 VarDecl *var = dyn_cast<VarDecl>(value);
John McCall76a40212011-02-09 01:13:10 +00001109 if (!var) return CR_NoCapture;
John McCall469a1eb2011-02-02 13:00:07 +00001110
1111 // Fast path: variables from the current context never require capture.
1112 DeclContext *DC = S.CurContext;
1113 if (var->getDeclContext() == DC) return CR_NoCapture;
1114
1115 // Only variables with local storage require capture.
1116 // FIXME: What about 'const' variables in C++?
1117 if (!var->hasLocalStorage()) return CR_NoCapture;
1118
1119 // Otherwise, we need to capture.
1120
1121 unsigned functionScopesIndex = S.FunctionScopes.size() - 1;
John McCall469a1eb2011-02-02 13:00:07 +00001122 do {
1123 // Only blocks (and eventually C++0x closures) can capture; other
1124 // scopes don't work.
1125 if (!isa<BlockDecl>(DC))
John McCall6b5a61b2011-02-07 10:33:21 +00001126 return diagnoseUncapturableValueReference(S, loc, var, DC);
John McCall469a1eb2011-02-02 13:00:07 +00001127
1128 BlockScopeInfo *blockScope =
1129 cast<BlockScopeInfo>(S.FunctionScopes[functionScopesIndex]);
1130 assert(blockScope->TheDecl == static_cast<BlockDecl*>(DC));
1131
John McCall6b5a61b2011-02-07 10:33:21 +00001132 // Check whether we've already captured it in this block. If so,
1133 // we're done.
1134 if (unsigned indexPlus1 = blockScope->CaptureMap[var])
1135 return propagateCapture(S, functionScopesIndex,
1136 blockScope->Captures[indexPlus1 - 1]);
John McCall469a1eb2011-02-02 13:00:07 +00001137
1138 functionScopesIndex--;
1139 DC = cast<BlockDecl>(DC)->getDeclContext();
1140 } while (var->getDeclContext() != DC);
1141
John McCall6b5a61b2011-02-07 10:33:21 +00001142 // Okay, we descended all the way to the block that defines the variable.
1143 // Actually try to capture it.
1144 QualType type = var->getType();
1145
1146 // Prohibit variably-modified types.
1147 if (type->isVariablyModifiedType()) {
1148 S.Diag(loc, diag::err_ref_vm_type);
1149 S.Diag(var->getLocation(), diag::note_declared_at);
1150 return CR_Error;
1151 }
1152
1153 // Prohibit arrays, even in __block variables, but not references to
1154 // them.
1155 if (type->isArrayType()) {
1156 S.Diag(loc, diag::err_ref_array_type);
1157 S.Diag(var->getLocation(), diag::note_declared_at);
1158 return CR_Error;
1159 }
1160
1161 S.MarkDeclarationReferenced(loc, var);
1162
1163 // The BlocksAttr indicates the variable is bound by-reference.
1164 bool byRef = var->hasAttr<BlocksAttr>();
1165
1166 // Build a copy expression.
1167 Expr *copyExpr = 0;
John McCall642a75f2011-04-28 02:15:35 +00001168 const RecordType *rtype;
1169 if (!byRef && S.getLangOptions().CPlusPlus && !type->isDependentType() &&
1170 (rtype = type->getAs<RecordType>())) {
1171
1172 // The capture logic needs the destructor, so make sure we mark it.
1173 // Usually this is unnecessary because most local variables have
1174 // their destructors marked at declaration time, but parameters are
1175 // an exception because it's technically only the call site that
1176 // actually requires the destructor.
1177 if (isa<ParmVarDecl>(var))
1178 S.FinalizeVarWithDestructor(var, rtype);
1179
John McCall6b5a61b2011-02-07 10:33:21 +00001180 // According to the blocks spec, the capture of a variable from
1181 // the stack requires a const copy constructor. This is not true
1182 // of the copy/move done to move a __block variable to the heap.
1183 type.addConst();
1184
1185 Expr *declRef = new (S.Context) DeclRefExpr(var, type, VK_LValue, loc);
1186 ExprResult result =
1187 S.PerformCopyInitialization(
1188 InitializedEntity::InitializeBlock(var->getLocation(),
1189 type, false),
1190 loc, S.Owned(declRef));
1191
1192 // Build a full-expression copy expression if initialization
1193 // succeeded and used a non-trivial constructor. Recover from
1194 // errors by pretending that the copy isn't necessary.
1195 if (!result.isInvalid() &&
1196 !cast<CXXConstructExpr>(result.get())->getConstructor()->isTrivial()) {
1197 result = S.MaybeCreateExprWithCleanups(result);
1198 copyExpr = result.take();
1199 }
1200 }
1201
1202 // We're currently at the declarer; go back to the closure.
1203 functionScopesIndex++;
1204 BlockScopeInfo *blockScope =
1205 cast<BlockScopeInfo>(S.FunctionScopes[functionScopesIndex]);
1206
1207 // Build a valid capture in this scope.
1208 blockScope->Captures.push_back(
1209 BlockDecl::Capture(var, byRef, /*nested*/ false, copyExpr));
1210 blockScope->CaptureMap[var] = blockScope->Captures.size(); // +1
1211
1212 // Propagate that to inner captures if necessary.
1213 return propagateCapture(S, functionScopesIndex,
1214 blockScope->Captures.back());
1215}
1216
1217static ExprResult BuildBlockDeclRefExpr(Sema &S, ValueDecl *vd,
1218 const DeclarationNameInfo &NameInfo,
1219 bool byRef) {
1220 assert(isa<VarDecl>(vd) && "capturing non-variable");
1221
1222 VarDecl *var = cast<VarDecl>(vd);
1223 assert(var->hasLocalStorage() && "capturing non-local");
1224 assert(byRef == var->hasAttr<BlocksAttr>() && "byref set wrong");
1225
1226 QualType exprType = var->getType().getNonReferenceType();
1227
1228 BlockDeclRefExpr *BDRE;
1229 if (!byRef) {
1230 // The variable will be bound by copy; make it const within the
1231 // closure, but record that this was done in the expression.
1232 bool constAdded = !exprType.isConstQualified();
1233 exprType.addConst();
1234
1235 BDRE = new (S.Context) BlockDeclRefExpr(var, exprType, VK_LValue,
1236 NameInfo.getLoc(), false,
1237 constAdded);
1238 } else {
1239 BDRE = new (S.Context) BlockDeclRefExpr(var, exprType, VK_LValue,
1240 NameInfo.getLoc(), true);
1241 }
1242
1243 return S.Owned(BDRE);
John McCall469a1eb2011-02-02 13:00:07 +00001244}
Chris Lattner639e2d32008-10-20 05:16:36 +00001245
John McCall60d7b3a2010-08-24 06:29:42 +00001246ExprResult
John McCallf89e55a2010-11-18 06:31:45 +00001247Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
John McCall76a40212011-02-09 01:13:10 +00001248 SourceLocation Loc,
1249 const CXXScopeSpec *SS) {
Abramo Bagnara25777432010-08-11 22:01:17 +00001250 DeclarationNameInfo NameInfo(D->getDeclName(), Loc);
John McCallf89e55a2010-11-18 06:31:45 +00001251 return BuildDeclRefExpr(D, Ty, VK, NameInfo, SS);
Abramo Bagnara25777432010-08-11 22:01:17 +00001252}
1253
John McCall76a40212011-02-09 01:13:10 +00001254/// BuildDeclRefExpr - Build an expression that references a
1255/// declaration that does not require a closure capture.
John McCall60d7b3a2010-08-24 06:29:42 +00001256ExprResult
John McCall76a40212011-02-09 01:13:10 +00001257Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
Abramo Bagnara25777432010-08-11 22:01:17 +00001258 const DeclarationNameInfo &NameInfo,
1259 const CXXScopeSpec *SS) {
Abramo Bagnara25777432010-08-11 22:01:17 +00001260 MarkDeclarationReferenced(NameInfo.getLoc(), D);
Mike Stump1eb44332009-09-09 15:08:12 +00001261
John McCall7eb0a9e2010-11-24 05:12:34 +00001262 Expr *E = DeclRefExpr::Create(Context,
Douglas Gregor40d96a62011-02-28 21:54:11 +00001263 SS? SS->getWithLocInContext(Context)
1264 : NestedNameSpecifierLoc(),
John McCall7eb0a9e2010-11-24 05:12:34 +00001265 D, NameInfo, Ty, VK);
1266
1267 // Just in case we're building an illegal pointer-to-member.
1268 if (isa<FieldDecl>(D) && cast<FieldDecl>(D)->getBitWidth())
1269 E->setObjectKind(OK_BitField);
1270
1271 return Owned(E);
Douglas Gregor1a49af92009-01-06 05:10:23 +00001272}
1273
John McCalldfa1edb2010-11-23 20:48:44 +00001274static ExprResult
1275BuildFieldReferenceExpr(Sema &S, Expr *BaseExpr, bool IsArrow,
1276 const CXXScopeSpec &SS, FieldDecl *Field,
1277 DeclAccessPair FoundDecl,
1278 const DeclarationNameInfo &MemberNameInfo);
1279
John McCall60d7b3a2010-08-24 06:29:42 +00001280ExprResult
John McCall5808ce42011-02-03 08:15:49 +00001281Sema::BuildAnonymousStructUnionMemberReference(const CXXScopeSpec &SS,
1282 SourceLocation loc,
1283 IndirectFieldDecl *indirectField,
1284 Expr *baseObjectExpr,
1285 SourceLocation opLoc) {
1286 // First, build the expression that refers to the base object.
1287
1288 bool baseObjectIsPointer = false;
1289 Qualifiers baseQuals;
1290
1291 // Case 1: the base of the indirect field is not a field.
1292 VarDecl *baseVariable = indirectField->getVarDecl();
Douglas Gregorf5848322011-02-18 02:44:58 +00001293 CXXScopeSpec EmptySS;
John McCall5808ce42011-02-03 08:15:49 +00001294 if (baseVariable) {
1295 assert(baseVariable->getType()->isRecordType());
1296
1297 // In principle we could have a member access expression that
1298 // accesses an anonymous struct/union that's a static member of
1299 // the base object's class. However, under the current standard,
1300 // static data members cannot be anonymous structs or unions.
1301 // Supporting this is as easy as building a MemberExpr here.
1302 assert(!baseObjectExpr && "anonymous struct/union is static data member?");
1303
1304 DeclarationNameInfo baseNameInfo(DeclarationName(), loc);
1305
1306 ExprResult result =
Douglas Gregorf5848322011-02-18 02:44:58 +00001307 BuildDeclarationNameExpr(EmptySS, baseNameInfo, baseVariable);
John McCall5808ce42011-02-03 08:15:49 +00001308 if (result.isInvalid()) return ExprError();
1309
1310 baseObjectExpr = result.take();
1311 baseObjectIsPointer = false;
1312 baseQuals = baseObjectExpr->getType().getQualifiers();
1313
1314 // Case 2: the base of the indirect field is a field and the user
1315 // wrote a member expression.
1316 } else if (baseObjectExpr) {
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001317 // The caller provided the base object expression. Determine
1318 // whether its a pointer and whether it adds any qualifiers to the
1319 // anonymous struct/union fields we're looking into.
John McCall5808ce42011-02-03 08:15:49 +00001320 QualType objectType = baseObjectExpr->getType();
1321
1322 if (const PointerType *ptr = objectType->getAs<PointerType>()) {
1323 baseObjectIsPointer = true;
1324 objectType = ptr->getPointeeType();
1325 } else {
1326 baseObjectIsPointer = false;
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001327 }
John McCall5808ce42011-02-03 08:15:49 +00001328 baseQuals = objectType.getQualifiers();
1329
1330 // Case 3: the base of the indirect field is a field and we should
1331 // build an implicit member access.
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001332 } else {
1333 // We've found a member of an anonymous struct/union that is
1334 // inside a non-anonymous struct/union, so in a well-formed
1335 // program our base object expression is "this".
John McCall5808ce42011-02-03 08:15:49 +00001336 CXXMethodDecl *method = tryCaptureCXXThis();
1337 if (!method) {
1338 Diag(loc, diag::err_invalid_member_use_in_static_method)
1339 << indirectField->getDeclName();
1340 return ExprError();
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001341 }
1342
John McCall5808ce42011-02-03 08:15:49 +00001343 // Our base object expression is "this".
1344 baseObjectExpr =
1345 new (Context) CXXThisExpr(loc, method->getThisType(Context),
1346 /*isImplicit=*/ true);
1347 baseObjectIsPointer = true;
1348 baseQuals = Qualifiers::fromCVRMask(method->getTypeQualifiers());
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001349 }
1350
1351 // Build the implicit member references to the field of the
1352 // anonymous struct/union.
John McCall5808ce42011-02-03 08:15:49 +00001353 Expr *result = baseObjectExpr;
1354 IndirectFieldDecl::chain_iterator
1355 FI = indirectField->chain_begin(), FEnd = indirectField->chain_end();
John McCalldfa1edb2010-11-23 20:48:44 +00001356
John McCall5808ce42011-02-03 08:15:49 +00001357 // Build the first member access in the chain with full information.
1358 if (!baseVariable) {
1359 FieldDecl *field = cast<FieldDecl>(*FI);
John McCalldfa1edb2010-11-23 20:48:44 +00001360
John McCall5808ce42011-02-03 08:15:49 +00001361 // FIXME: use the real found-decl info!
1362 DeclAccessPair foundDecl = DeclAccessPair::make(field, field->getAccess());
John McCall0953e762009-09-24 19:53:00 +00001363
John McCall5808ce42011-02-03 08:15:49 +00001364 // Make a nameInfo that properly uses the anonymous name.
1365 DeclarationNameInfo memberNameInfo(field->getDeclName(), loc);
John McCall0953e762009-09-24 19:53:00 +00001366
John McCall5808ce42011-02-03 08:15:49 +00001367 result = BuildFieldReferenceExpr(*this, result, baseObjectIsPointer,
Douglas Gregorf5848322011-02-18 02:44:58 +00001368 EmptySS, field, foundDecl,
John McCall5808ce42011-02-03 08:15:49 +00001369 memberNameInfo).take();
1370 baseObjectIsPointer = false;
John McCall0953e762009-09-24 19:53:00 +00001371
John McCall5808ce42011-02-03 08:15:49 +00001372 // FIXME: check qualified member access
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001373 }
1374
John McCall5808ce42011-02-03 08:15:49 +00001375 // In all cases, we should now skip the first declaration in the chain.
1376 ++FI;
1377
Douglas Gregorf5848322011-02-18 02:44:58 +00001378 while (FI != FEnd) {
1379 FieldDecl *field = cast<FieldDecl>(*FI++);
John McCall5808ce42011-02-03 08:15:49 +00001380
1381 // FIXME: these are somewhat meaningless
1382 DeclarationNameInfo memberNameInfo(field->getDeclName(), loc);
1383 DeclAccessPair foundDecl = DeclAccessPair::make(field, field->getAccess());
John McCall5808ce42011-02-03 08:15:49 +00001384
1385 result = BuildFieldReferenceExpr(*this, result, /*isarrow*/ false,
Douglas Gregorf5848322011-02-18 02:44:58 +00001386 (FI == FEnd? SS : EmptySS), field,
1387 foundDecl, memberNameInfo)
John McCall5808ce42011-02-03 08:15:49 +00001388 .take();
1389 }
1390
1391 return Owned(result);
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001392}
1393
Abramo Bagnara25777432010-08-11 22:01:17 +00001394/// Decomposes the given name into a DeclarationNameInfo, its location, and
John McCall129e2df2009-11-30 22:42:35 +00001395/// possibly a list of template arguments.
1396///
1397/// If this produces template arguments, it is permitted to call
1398/// DecomposeTemplateName.
1399///
1400/// This actually loses a lot of source location information for
1401/// non-standard name kinds; we should consider preserving that in
1402/// some way.
1403static void DecomposeUnqualifiedId(Sema &SemaRef,
1404 const UnqualifiedId &Id,
1405 TemplateArgumentListInfo &Buffer,
Abramo Bagnara25777432010-08-11 22:01:17 +00001406 DeclarationNameInfo &NameInfo,
John McCall129e2df2009-11-30 22:42:35 +00001407 const TemplateArgumentListInfo *&TemplateArgs) {
1408 if (Id.getKind() == UnqualifiedId::IK_TemplateId) {
1409 Buffer.setLAngleLoc(Id.TemplateId->LAngleLoc);
1410 Buffer.setRAngleLoc(Id.TemplateId->RAngleLoc);
1411
1412 ASTTemplateArgsPtr TemplateArgsPtr(SemaRef,
1413 Id.TemplateId->getTemplateArgs(),
1414 Id.TemplateId->NumArgs);
1415 SemaRef.translateTemplateArguments(TemplateArgsPtr, Buffer);
1416 TemplateArgsPtr.release();
1417
John McCall2b5289b2010-08-23 07:28:44 +00001418 TemplateName TName = Id.TemplateId->Template.get();
Abramo Bagnara25777432010-08-11 22:01:17 +00001419 SourceLocation TNameLoc = Id.TemplateId->TemplateNameLoc;
1420 NameInfo = SemaRef.Context.getNameForTemplate(TName, TNameLoc);
John McCall129e2df2009-11-30 22:42:35 +00001421 TemplateArgs = &Buffer;
1422 } else {
Abramo Bagnara25777432010-08-11 22:01:17 +00001423 NameInfo = SemaRef.GetNameFromUnqualifiedId(Id);
John McCall129e2df2009-11-30 22:42:35 +00001424 TemplateArgs = 0;
1425 }
1426}
1427
John McCallaa81e162009-12-01 22:10:20 +00001428/// Determines if the given class is provably not derived from all of
1429/// the prospective base classes.
1430static bool IsProvablyNotDerivedFrom(Sema &SemaRef,
1431 CXXRecordDecl *Record,
1432 const llvm::SmallPtrSet<CXXRecordDecl*, 4> &Bases) {
John McCallb1b42562009-12-01 22:28:41 +00001433 if (Bases.count(Record->getCanonicalDecl()))
John McCallaa81e162009-12-01 22:10:20 +00001434 return false;
1435
Douglas Gregor952b0172010-02-11 01:04:33 +00001436 RecordDecl *RD = Record->getDefinition();
John McCallb1b42562009-12-01 22:28:41 +00001437 if (!RD) return false;
1438 Record = cast<CXXRecordDecl>(RD);
1439
John McCallaa81e162009-12-01 22:10:20 +00001440 for (CXXRecordDecl::base_class_iterator I = Record->bases_begin(),
1441 E = Record->bases_end(); I != E; ++I) {
1442 CanQualType BaseT = SemaRef.Context.getCanonicalType((*I).getType());
1443 CanQual<RecordType> BaseRT = BaseT->getAs<RecordType>();
1444 if (!BaseRT) return false;
1445
1446 CXXRecordDecl *BaseRecord = cast<CXXRecordDecl>(BaseRT->getDecl());
John McCallaa81e162009-12-01 22:10:20 +00001447 if (!IsProvablyNotDerivedFrom(SemaRef, BaseRecord, Bases))
1448 return false;
1449 }
1450
1451 return true;
1452}
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001453
John McCallaa81e162009-12-01 22:10:20 +00001454enum IMAKind {
1455 /// The reference is definitely not an instance member access.
1456 IMA_Static,
1457
1458 /// The reference may be an implicit instance member access.
1459 IMA_Mixed,
1460
1461 /// The reference may be to an instance member, but it is invalid if
1462 /// so, because the context is not an instance method.
1463 IMA_Mixed_StaticContext,
1464
1465 /// The reference may be to an instance member, but it is invalid if
1466 /// so, because the context is from an unrelated class.
1467 IMA_Mixed_Unrelated,
1468
1469 /// The reference is definitely an implicit instance member access.
1470 IMA_Instance,
1471
1472 /// The reference may be to an unresolved using declaration.
1473 IMA_Unresolved,
1474
1475 /// The reference may be to an unresolved using declaration and the
1476 /// context is not an instance method.
1477 IMA_Unresolved_StaticContext,
1478
John McCallaa81e162009-12-01 22:10:20 +00001479 /// All possible referrents are instance members and the current
1480 /// context is not an instance method.
1481 IMA_Error_StaticContext,
1482
1483 /// All possible referrents are instance members of an unrelated
1484 /// class.
1485 IMA_Error_Unrelated
1486};
1487
1488/// The given lookup names class member(s) and is not being used for
1489/// an address-of-member expression. Classify the type of access
1490/// according to whether it's possible that this reference names an
1491/// instance member. This is best-effort; it is okay to
1492/// conservatively answer "yes", in which case some errors will simply
1493/// not be caught until template-instantiation.
1494static IMAKind ClassifyImplicitMemberAccess(Sema &SemaRef,
1495 const LookupResult &R) {
John McCall3b4294e2009-12-16 12:17:52 +00001496 assert(!R.empty() && (*R.begin())->isCXXClassMember());
John McCallaa81e162009-12-01 22:10:20 +00001497
John McCallea1471e2010-05-20 01:18:31 +00001498 DeclContext *DC = SemaRef.getFunctionLevelDeclContext();
John McCallaa81e162009-12-01 22:10:20 +00001499 bool isStaticContext =
John McCallea1471e2010-05-20 01:18:31 +00001500 (!isa<CXXMethodDecl>(DC) ||
1501 cast<CXXMethodDecl>(DC)->isStatic());
John McCallaa81e162009-12-01 22:10:20 +00001502
1503 if (R.isUnresolvableResult())
1504 return isStaticContext ? IMA_Unresolved_StaticContext : IMA_Unresolved;
1505
1506 // Collect all the declaring classes of instance members we find.
1507 bool hasNonInstance = false;
Sebastian Redlf9780002010-11-26 16:28:07 +00001508 bool hasField = false;
John McCallaa81e162009-12-01 22:10:20 +00001509 llvm::SmallPtrSet<CXXRecordDecl*, 4> Classes;
1510 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
John McCall161755a2010-04-06 21:38:20 +00001511 NamedDecl *D = *I;
Francois Pichet87c2e122010-11-21 06:08:52 +00001512
John McCall161755a2010-04-06 21:38:20 +00001513 if (D->isCXXInstanceMember()) {
Sebastian Redlf9780002010-11-26 16:28:07 +00001514 if (dyn_cast<FieldDecl>(D))
1515 hasField = true;
1516
John McCallaa81e162009-12-01 22:10:20 +00001517 CXXRecordDecl *R = cast<CXXRecordDecl>(D->getDeclContext());
John McCallaa81e162009-12-01 22:10:20 +00001518 Classes.insert(R->getCanonicalDecl());
1519 }
1520 else
1521 hasNonInstance = true;
1522 }
1523
1524 // If we didn't find any instance members, it can't be an implicit
1525 // member reference.
1526 if (Classes.empty())
1527 return IMA_Static;
1528
1529 // If the current context is not an instance method, it can't be
1530 // an implicit member reference.
Sebastian Redlf9780002010-11-26 16:28:07 +00001531 if (isStaticContext) {
1532 if (hasNonInstance)
1533 return IMA_Mixed_StaticContext;
1534
1535 if (SemaRef.getLangOptions().CPlusPlus0x && hasField) {
1536 // C++0x [expr.prim.general]p10:
1537 // An id-expression that denotes a non-static data member or non-static
1538 // member function of a class can only be used:
1539 // (...)
1540 // - if that id-expression denotes a non-static data member and it appears in an unevaluated operand.
1541 const Sema::ExpressionEvaluationContextRecord& record = SemaRef.ExprEvalContexts.back();
1542 bool isUnevaluatedExpression = record.Context == Sema::Unevaluated;
1543 if (isUnevaluatedExpression)
1544 return IMA_Mixed_StaticContext;
1545 }
1546
1547 return IMA_Error_StaticContext;
1548 }
John McCallaa81e162009-12-01 22:10:20 +00001549
Argyrios Kyrtzidis0d8dc462011-04-14 00:46:47 +00001550 CXXRecordDecl *
1551 contextClass = cast<CXXMethodDecl>(DC)->getParent()->getCanonicalDecl();
1552
1553 // [class.mfct.non-static]p3:
1554 // ...is used in the body of a non-static member function of class X,
1555 // if name lookup (3.4.1) resolves the name in the id-expression to a
1556 // non-static non-type member of some class C [...]
1557 // ...if C is not X or a base class of X, the class member access expression
1558 // is ill-formed.
1559 if (R.getNamingClass() &&
1560 contextClass != R.getNamingClass()->getCanonicalDecl() &&
1561 contextClass->isProvablyNotDerivedFrom(R.getNamingClass()))
1562 return (hasNonInstance ? IMA_Mixed_Unrelated : IMA_Error_Unrelated);
1563
John McCallaa81e162009-12-01 22:10:20 +00001564 // If we can prove that the current context is unrelated to all the
1565 // declaring classes, it can't be an implicit member reference (in
1566 // which case it's an error if any of those members are selected).
Argyrios Kyrtzidis0d8dc462011-04-14 00:46:47 +00001567 if (IsProvablyNotDerivedFrom(SemaRef, contextClass, Classes))
John McCallaa81e162009-12-01 22:10:20 +00001568 return (hasNonInstance ? IMA_Mixed_Unrelated : IMA_Error_Unrelated);
1569
1570 return (hasNonInstance ? IMA_Mixed : IMA_Instance);
1571}
1572
1573/// Diagnose a reference to a field with no object available.
1574static void DiagnoseInstanceReference(Sema &SemaRef,
1575 const CXXScopeSpec &SS,
John McCall5808ce42011-02-03 08:15:49 +00001576 NamedDecl *rep,
1577 const DeclarationNameInfo &nameInfo) {
1578 SourceLocation Loc = nameInfo.getLoc();
John McCallaa81e162009-12-01 22:10:20 +00001579 SourceRange Range(Loc);
1580 if (SS.isSet()) Range.setBegin(SS.getRange().getBegin());
1581
John McCall5808ce42011-02-03 08:15:49 +00001582 if (isa<FieldDecl>(rep) || isa<IndirectFieldDecl>(rep)) {
John McCallaa81e162009-12-01 22:10:20 +00001583 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(SemaRef.CurContext)) {
1584 if (MD->isStatic()) {
1585 // "invalid use of member 'x' in static member function"
1586 SemaRef.Diag(Loc, diag::err_invalid_member_use_in_static_method)
John McCall5808ce42011-02-03 08:15:49 +00001587 << Range << nameInfo.getName();
John McCallaa81e162009-12-01 22:10:20 +00001588 return;
1589 }
1590 }
1591
1592 SemaRef.Diag(Loc, diag::err_invalid_non_static_member_use)
John McCall5808ce42011-02-03 08:15:49 +00001593 << nameInfo.getName() << Range;
John McCallaa81e162009-12-01 22:10:20 +00001594 return;
1595 }
1596
1597 SemaRef.Diag(Loc, diag::err_member_call_without_object) << Range;
John McCall129e2df2009-11-30 22:42:35 +00001598}
1599
John McCall578b69b2009-12-16 08:11:27 +00001600/// Diagnose an empty lookup.
1601///
1602/// \return false if new lookup candidates were found
Nick Lewycky03d98c52010-07-06 19:51:49 +00001603bool Sema::DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R,
1604 CorrectTypoContext CTC) {
John McCall578b69b2009-12-16 08:11:27 +00001605 DeclarationName Name = R.getLookupName();
1606
John McCall578b69b2009-12-16 08:11:27 +00001607 unsigned diagnostic = diag::err_undeclared_var_use;
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001608 unsigned diagnostic_suggest = diag::err_undeclared_var_use_suggest;
John McCall578b69b2009-12-16 08:11:27 +00001609 if (Name.getNameKind() == DeclarationName::CXXOperatorName ||
1610 Name.getNameKind() == DeclarationName::CXXLiteralOperatorName ||
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001611 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
John McCall578b69b2009-12-16 08:11:27 +00001612 diagnostic = diag::err_undeclared_use;
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001613 diagnostic_suggest = diag::err_undeclared_use_suggest;
1614 }
John McCall578b69b2009-12-16 08:11:27 +00001615
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001616 // If the original lookup was an unqualified lookup, fake an
1617 // unqualified lookup. This is useful when (for example) the
1618 // original lookup would not have found something because it was a
1619 // dependent name.
Nick Lewycky03d98c52010-07-06 19:51:49 +00001620 for (DeclContext *DC = SS.isEmpty() ? CurContext : 0;
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001621 DC; DC = DC->getParent()) {
John McCall578b69b2009-12-16 08:11:27 +00001622 if (isa<CXXRecordDecl>(DC)) {
1623 LookupQualifiedName(R, DC);
1624
1625 if (!R.empty()) {
1626 // Don't give errors about ambiguities in this lookup.
1627 R.suppressDiagnostics();
1628
1629 CXXMethodDecl *CurMethod = dyn_cast<CXXMethodDecl>(CurContext);
1630 bool isInstance = CurMethod &&
1631 CurMethod->isInstance() &&
1632 DC == CurMethod->getParent();
1633
1634 // Give a code modification hint to insert 'this->'.
1635 // TODO: fixit for inserting 'Base<T>::' in the other cases.
1636 // Actually quite difficult!
Nick Lewycky03d98c52010-07-06 19:51:49 +00001637 if (isInstance) {
Nick Lewycky03d98c52010-07-06 19:51:49 +00001638 UnresolvedLookupExpr *ULE = cast<UnresolvedLookupExpr>(
1639 CallsUndergoingInstantiation.back()->getCallee());
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001640 CXXMethodDecl *DepMethod = cast_or_null<CXXMethodDecl>(
Nick Lewycky03d98c52010-07-06 19:51:49 +00001641 CurMethod->getInstantiatedFromMemberFunction());
Eli Friedmana7e68452010-08-22 01:00:03 +00001642 if (DepMethod) {
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001643 Diag(R.getNameLoc(), diagnostic) << Name
1644 << FixItHint::CreateInsertion(R.getNameLoc(), "this->");
1645 QualType DepThisType = DepMethod->getThisType(Context);
1646 CXXThisExpr *DepThis = new (Context) CXXThisExpr(
1647 R.getNameLoc(), DepThisType, false);
1648 TemplateArgumentListInfo TList;
1649 if (ULE->hasExplicitTemplateArgs())
1650 ULE->copyTemplateArgumentsInto(TList);
Douglas Gregor7c3179c2011-02-28 18:50:33 +00001651
Douglas Gregor7c3179c2011-02-28 18:50:33 +00001652 CXXScopeSpec SS;
Douglas Gregor4c9be892011-02-28 20:01:57 +00001653 SS.Adopt(ULE->getQualifierLoc());
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001654 CXXDependentScopeMemberExpr *DepExpr =
1655 CXXDependentScopeMemberExpr::Create(
1656 Context, DepThis, DepThisType, true, SourceLocation(),
Douglas Gregor7c3179c2011-02-28 18:50:33 +00001657 SS.getWithLocInContext(Context), NULL,
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001658 R.getLookupNameInfo(), &TList);
1659 CallsUndergoingInstantiation.back()->setCallee(DepExpr);
Eli Friedmana7e68452010-08-22 01:00:03 +00001660 } else {
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001661 // FIXME: we should be able to handle this case too. It is correct
1662 // to add this-> here. This is a workaround for PR7947.
1663 Diag(R.getNameLoc(), diagnostic) << Name;
Eli Friedmana7e68452010-08-22 01:00:03 +00001664 }
Nick Lewycky03d98c52010-07-06 19:51:49 +00001665 } else {
John McCall578b69b2009-12-16 08:11:27 +00001666 Diag(R.getNameLoc(), diagnostic) << Name;
Nick Lewycky03d98c52010-07-06 19:51:49 +00001667 }
John McCall578b69b2009-12-16 08:11:27 +00001668
1669 // Do we really want to note all of these?
1670 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
1671 Diag((*I)->getLocation(), diag::note_dependent_var_use);
1672
1673 // Tell the callee to try to recover.
1674 return false;
1675 }
Douglas Gregore26f0432010-08-09 22:38:14 +00001676
1677 R.clear();
John McCall578b69b2009-12-16 08:11:27 +00001678 }
1679 }
1680
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001681 // We didn't find anything, so try to correct for a typo.
Douglas Gregoraaf87162010-04-14 20:04:41 +00001682 DeclarationName Corrected;
Daniel Dunbardc32cdf2010-06-02 15:46:52 +00001683 if (S && (Corrected = CorrectTypo(R, S, &SS, 0, false, CTC))) {
Douglas Gregoraaf87162010-04-14 20:04:41 +00001684 if (!R.empty()) {
1685 if (isa<ValueDecl>(*R.begin()) || isa<FunctionTemplateDecl>(*R.begin())) {
1686 if (SS.isEmpty())
1687 Diag(R.getNameLoc(), diagnostic_suggest) << Name << R.getLookupName()
1688 << FixItHint::CreateReplacement(R.getNameLoc(),
1689 R.getLookupName().getAsString());
1690 else
1691 Diag(R.getNameLoc(), diag::err_no_member_suggest)
1692 << Name << computeDeclContext(SS, false) << R.getLookupName()
1693 << SS.getRange()
1694 << FixItHint::CreateReplacement(R.getNameLoc(),
1695 R.getLookupName().getAsString());
1696 if (NamedDecl *ND = R.getAsSingle<NamedDecl>())
1697 Diag(ND->getLocation(), diag::note_previous_decl)
1698 << ND->getDeclName();
1699
1700 // Tell the callee to try to recover.
1701 return false;
1702 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00001703
Douglas Gregoraaf87162010-04-14 20:04:41 +00001704 if (isa<TypeDecl>(*R.begin()) || isa<ObjCInterfaceDecl>(*R.begin())) {
1705 // FIXME: If we ended up with a typo for a type name or
1706 // Objective-C class name, we're in trouble because the parser
1707 // is in the wrong place to recover. Suggest the typo
1708 // correction, but don't make it a fix-it since we're not going
1709 // to recover well anyway.
1710 if (SS.isEmpty())
1711 Diag(R.getNameLoc(), diagnostic_suggest) << Name << R.getLookupName();
1712 else
1713 Diag(R.getNameLoc(), diag::err_no_member_suggest)
1714 << Name << computeDeclContext(SS, false) << R.getLookupName()
1715 << SS.getRange();
1716
1717 // Don't try to recover; it won't work.
1718 return true;
1719 }
1720 } else {
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00001721 // FIXME: We found a keyword. Suggest it, but don't provide a fix-it
Douglas Gregoraaf87162010-04-14 20:04:41 +00001722 // because we aren't able to recover.
Douglas Gregord203a162010-01-01 00:15:04 +00001723 if (SS.isEmpty())
Douglas Gregoraaf87162010-04-14 20:04:41 +00001724 Diag(R.getNameLoc(), diagnostic_suggest) << Name << Corrected;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001725 else
Douglas Gregord203a162010-01-01 00:15:04 +00001726 Diag(R.getNameLoc(), diag::err_no_member_suggest)
Douglas Gregoraaf87162010-04-14 20:04:41 +00001727 << Name << computeDeclContext(SS, false) << Corrected
1728 << SS.getRange();
Douglas Gregord203a162010-01-01 00:15:04 +00001729 return true;
1730 }
Douglas Gregord203a162010-01-01 00:15:04 +00001731 R.clear();
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001732 }
1733
1734 // Emit a special diagnostic for failed member lookups.
1735 // FIXME: computing the declaration context might fail here (?)
1736 if (!SS.isEmpty()) {
1737 Diag(R.getNameLoc(), diag::err_no_member)
1738 << Name << computeDeclContext(SS, false)
1739 << SS.getRange();
1740 return true;
1741 }
1742
John McCall578b69b2009-12-16 08:11:27 +00001743 // Give up, we can't recover.
1744 Diag(R.getNameLoc(), diagnostic) << Name;
1745 return true;
1746}
1747
Douglas Gregorca45da02010-11-02 20:36:02 +00001748ObjCPropertyDecl *Sema::canSynthesizeProvisionalIvar(IdentifierInfo *II) {
1749 ObjCMethodDecl *CurMeth = getCurMethodDecl();
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001750 ObjCInterfaceDecl *IDecl = CurMeth->getClassInterface();
1751 if (!IDecl)
1752 return 0;
1753 ObjCImplementationDecl *ClassImpDecl = IDecl->getImplementation();
1754 if (!ClassImpDecl)
1755 return 0;
Douglas Gregorca45da02010-11-02 20:36:02 +00001756 ObjCPropertyDecl *property = LookupPropertyDecl(IDecl, II);
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001757 if (!property)
1758 return 0;
1759 if (ObjCPropertyImplDecl *PIDecl = ClassImpDecl->FindPropertyImplDecl(II))
Douglas Gregorca45da02010-11-02 20:36:02 +00001760 if (PIDecl->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic ||
1761 PIDecl->getPropertyIvarDecl())
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001762 return 0;
1763 return property;
1764}
1765
Douglas Gregorca45da02010-11-02 20:36:02 +00001766bool Sema::canSynthesizeProvisionalIvar(ObjCPropertyDecl *Property) {
1767 ObjCMethodDecl *CurMeth = getCurMethodDecl();
1768 ObjCInterfaceDecl *IDecl = CurMeth->getClassInterface();
1769 if (!IDecl)
1770 return false;
1771 ObjCImplementationDecl *ClassImpDecl = IDecl->getImplementation();
1772 if (!ClassImpDecl)
1773 return false;
1774 if (ObjCPropertyImplDecl *PIDecl
1775 = ClassImpDecl->FindPropertyImplDecl(Property->getIdentifier()))
1776 if (PIDecl->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic ||
1777 PIDecl->getPropertyIvarDecl())
1778 return false;
1779
1780 return true;
1781}
1782
Douglas Gregor312eadb2011-04-24 05:37:28 +00001783ObjCIvarDecl *Sema::SynthesizeProvisionalIvar(LookupResult &Lookup,
1784 IdentifierInfo *II,
1785 SourceLocation NameLoc) {
1786 ObjCMethodDecl *CurMeth = getCurMethodDecl();
Fariborz Jahanian73f666f2010-07-30 16:59:05 +00001787 bool LookForIvars;
1788 if (Lookup.empty())
1789 LookForIvars = true;
1790 else if (CurMeth->isClassMethod())
1791 LookForIvars = false;
1792 else
1793 LookForIvars = (Lookup.isSingleResult() &&
Fariborz Jahaniand0fbadd2011-01-26 00:57:01 +00001794 Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod() &&
1795 (Lookup.getAsSingle<VarDecl>() != 0));
Fariborz Jahanian73f666f2010-07-30 16:59:05 +00001796 if (!LookForIvars)
1797 return 0;
1798
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001799 ObjCInterfaceDecl *IDecl = CurMeth->getClassInterface();
1800 if (!IDecl)
1801 return 0;
1802 ObjCImplementationDecl *ClassImpDecl = IDecl->getImplementation();
Fariborz Jahanian84ef4b22010-07-19 16:14:33 +00001803 if (!ClassImpDecl)
1804 return 0;
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001805 bool DynamicImplSeen = false;
Douglas Gregor312eadb2011-04-24 05:37:28 +00001806 ObjCPropertyDecl *property = LookupPropertyDecl(IDecl, II);
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001807 if (!property)
1808 return 0;
Fariborz Jahanian43e1b462010-10-19 19:08:23 +00001809 if (ObjCPropertyImplDecl *PIDecl = ClassImpDecl->FindPropertyImplDecl(II)) {
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001810 DynamicImplSeen =
1811 (PIDecl->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic);
Fariborz Jahanian43e1b462010-10-19 19:08:23 +00001812 // property implementation has a designated ivar. No need to assume a new
1813 // one.
1814 if (!DynamicImplSeen && PIDecl->getPropertyIvarDecl())
1815 return 0;
1816 }
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001817 if (!DynamicImplSeen) {
Douglas Gregor312eadb2011-04-24 05:37:28 +00001818 QualType PropType = Context.getCanonicalType(property->getType());
1819 ObjCIvarDecl *Ivar = ObjCIvarDecl::Create(Context, ClassImpDecl,
Abramo Bagnaraff676cb2011-03-08 08:55:46 +00001820 NameLoc, NameLoc,
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001821 II, PropType, /*Dinfo=*/0,
Fariborz Jahanian75049662010-12-15 23:29:04 +00001822 ObjCIvarDecl::Private,
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001823 (Expr *)0, true);
1824 ClassImpDecl->addDecl(Ivar);
1825 IDecl->makeDeclVisibleInContext(Ivar, false);
1826 property->setPropertyIvarDecl(Ivar);
1827 return Ivar;
1828 }
1829 return 0;
1830}
1831
John McCall60d7b3a2010-08-24 06:29:42 +00001832ExprResult Sema::ActOnIdExpression(Scope *S,
John McCallfb97e752010-08-24 22:52:39 +00001833 CXXScopeSpec &SS,
1834 UnqualifiedId &Id,
1835 bool HasTrailingLParen,
1836 bool isAddressOfOperand) {
John McCallf7a1a742009-11-24 19:00:30 +00001837 assert(!(isAddressOfOperand && HasTrailingLParen) &&
1838 "cannot be direct & operand and have a trailing lparen");
1839
1840 if (SS.isInvalid())
Douglas Gregor4c921ae2009-01-30 01:04:22 +00001841 return ExprError();
Douglas Gregor5953d8b2009-03-19 17:26:29 +00001842
John McCall129e2df2009-11-30 22:42:35 +00001843 TemplateArgumentListInfo TemplateArgsBuffer;
John McCallf7a1a742009-11-24 19:00:30 +00001844
1845 // Decompose the UnqualifiedId into the following data.
Abramo Bagnara25777432010-08-11 22:01:17 +00001846 DeclarationNameInfo NameInfo;
John McCallf7a1a742009-11-24 19:00:30 +00001847 const TemplateArgumentListInfo *TemplateArgs;
Abramo Bagnara25777432010-08-11 22:01:17 +00001848 DecomposeUnqualifiedId(*this, Id, TemplateArgsBuffer, NameInfo, TemplateArgs);
Douglas Gregor5953d8b2009-03-19 17:26:29 +00001849
Abramo Bagnara25777432010-08-11 22:01:17 +00001850 DeclarationName Name = NameInfo.getName();
Douglas Gregor10c42622008-11-18 15:03:34 +00001851 IdentifierInfo *II = Name.getAsIdentifierInfo();
Abramo Bagnara25777432010-08-11 22:01:17 +00001852 SourceLocation NameLoc = NameInfo.getLoc();
John McCallba135432009-11-21 08:51:07 +00001853
John McCallf7a1a742009-11-24 19:00:30 +00001854 // C++ [temp.dep.expr]p3:
1855 // An id-expression is type-dependent if it contains:
Douglas Gregor48026d22010-01-11 18:40:55 +00001856 // -- an identifier that was declared with a dependent type,
1857 // (note: handled after lookup)
1858 // -- a template-id that is dependent,
1859 // (note: handled in BuildTemplateIdExpr)
1860 // -- a conversion-function-id that specifies a dependent type,
John McCallf7a1a742009-11-24 19:00:30 +00001861 // -- a nested-name-specifier that contains a class-name that
1862 // names a dependent type.
1863 // Determine whether this is a member of an unknown specialization;
1864 // we need to handle these differently.
Eli Friedman647c8b32010-08-06 23:41:47 +00001865 bool DependentID = false;
1866 if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName &&
1867 Name.getCXXNameType()->isDependentType()) {
1868 DependentID = true;
1869 } else if (SS.isSet()) {
Chris Lattner337e5502011-02-18 01:27:55 +00001870 if (DeclContext *DC = computeDeclContext(SS, false)) {
Eli Friedman647c8b32010-08-06 23:41:47 +00001871 if (RequireCompleteDeclContext(SS, DC))
1872 return ExprError();
Eli Friedman647c8b32010-08-06 23:41:47 +00001873 } else {
1874 DependentID = true;
1875 }
1876 }
1877
Chris Lattner337e5502011-02-18 01:27:55 +00001878 if (DependentID)
Abramo Bagnara25777432010-08-11 22:01:17 +00001879 return ActOnDependentIdExpression(SS, NameInfo, isAddressOfOperand,
John McCallf7a1a742009-11-24 19:00:30 +00001880 TemplateArgs);
Chris Lattner337e5502011-02-18 01:27:55 +00001881
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001882 bool IvarLookupFollowUp = false;
John McCallf7a1a742009-11-24 19:00:30 +00001883 // Perform the required lookup.
Abramo Bagnara25777432010-08-11 22:01:17 +00001884 LookupResult R(*this, NameInfo, LookupOrdinaryName);
John McCallf7a1a742009-11-24 19:00:30 +00001885 if (TemplateArgs) {
Douglas Gregord2235f62010-05-20 20:58:56 +00001886 // Lookup the template name again to correctly establish the context in
1887 // which it was found. This is really unfortunate as we already did the
1888 // lookup to determine that it was a template name in the first place. If
1889 // this becomes a performance hit, we can work harder to preserve those
1890 // results until we get here but it's likely not worth it.
Douglas Gregor1fd6d442010-05-21 23:18:07 +00001891 bool MemberOfUnknownSpecialization;
1892 LookupTemplateName(R, S, SS, QualType(), /*EnteringContext=*/false,
1893 MemberOfUnknownSpecialization);
Douglas Gregor2f9f89c2011-02-04 13:35:07 +00001894
1895 if (MemberOfUnknownSpecialization ||
1896 (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation))
1897 return ActOnDependentIdExpression(SS, NameInfo, isAddressOfOperand,
1898 TemplateArgs);
John McCallf7a1a742009-11-24 19:00:30 +00001899 } else {
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001900 IvarLookupFollowUp = (!SS.isSet() && II && getCurMethodDecl());
Fariborz Jahanian48c2d562010-01-12 23:58:59 +00001901 LookupParsedName(R, S, &SS, !IvarLookupFollowUp);
Mike Stump1eb44332009-09-09 15:08:12 +00001902
Douglas Gregor2f9f89c2011-02-04 13:35:07 +00001903 // If the result might be in a dependent base class, this is a dependent
1904 // id-expression.
1905 if (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation)
1906 return ActOnDependentIdExpression(SS, NameInfo, isAddressOfOperand,
1907 TemplateArgs);
1908
John McCallf7a1a742009-11-24 19:00:30 +00001909 // If this reference is in an Objective-C method, then we need to do
1910 // some special Objective-C lookup, too.
Fariborz Jahanian48c2d562010-01-12 23:58:59 +00001911 if (IvarLookupFollowUp) {
John McCall60d7b3a2010-08-24 06:29:42 +00001912 ExprResult E(LookupInObjCMethod(R, S, II, true));
John McCallf7a1a742009-11-24 19:00:30 +00001913 if (E.isInvalid())
1914 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00001915
Chris Lattner337e5502011-02-18 01:27:55 +00001916 if (Expr *Ex = E.takeAs<Expr>())
1917 return Owned(Ex);
1918
1919 // Synthesize ivars lazily.
Fariborz Jahaniane776f882011-01-03 18:08:02 +00001920 if (getLangOptions().ObjCDefaultSynthProperties &&
1921 getLangOptions().ObjCNonFragileABI2) {
Douglas Gregor312eadb2011-04-24 05:37:28 +00001922 if (SynthesizeProvisionalIvar(R, II, NameLoc)) {
Fariborz Jahaniande267602010-11-17 19:41:23 +00001923 if (const ObjCPropertyDecl *Property =
1924 canSynthesizeProvisionalIvar(II)) {
1925 Diag(NameLoc, diag::warn_synthesized_ivar_access) << II;
1926 Diag(Property->getLocation(), diag::note_property_declare);
1927 }
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001928 return ActOnIdExpression(S, SS, Id, HasTrailingLParen,
1929 isAddressOfOperand);
Fariborz Jahaniande267602010-11-17 19:41:23 +00001930 }
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001931 }
Fariborz Jahanianf759b4d2010-08-13 18:09:39 +00001932 // for further use, this must be set to false if in class method.
1933 IvarLookupFollowUp = getCurMethodDecl()->isInstanceMethod();
Steve Naroffe3e9add2008-06-02 23:03:37 +00001934 }
Chris Lattner8a934232008-03-31 00:36:02 +00001935 }
Douglas Gregorc71e28c2009-02-16 19:28:42 +00001936
John McCallf7a1a742009-11-24 19:00:30 +00001937 if (R.isAmbiguous())
1938 return ExprError();
1939
Douglas Gregor48f3bb92009-02-18 21:56:37 +00001940 // Determine whether this name might be a candidate for
1941 // argument-dependent lookup.
John McCallf7a1a742009-11-24 19:00:30 +00001942 bool ADL = UseArgumentDependentLookup(SS, R, HasTrailingLParen);
Douglas Gregor48f3bb92009-02-18 21:56:37 +00001943
John McCallf7a1a742009-11-24 19:00:30 +00001944 if (R.empty() && !ADL) {
Reid Spencer5f016e22007-07-11 17:01:13 +00001945 // Otherwise, this could be an implicitly declared function reference (legal
John McCallf7a1a742009-11-24 19:00:30 +00001946 // in C90, extension in C99, forbidden in C++).
1947 if (HasTrailingLParen && II && !getLangOptions().CPlusPlus) {
1948 NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *II, S);
1949 if (D) R.addDecl(D);
1950 }
1951
1952 // If this name wasn't predeclared and if this is not a function
1953 // call, diagnose the problem.
1954 if (R.empty()) {
Douglas Gregor91f7ac72010-05-18 16:14:23 +00001955 if (DiagnoseEmptyLookup(S, SS, R, CTC_Unknown))
John McCall578b69b2009-12-16 08:11:27 +00001956 return ExprError();
1957
1958 assert(!R.empty() &&
1959 "DiagnoseEmptyLookup returned false but added no results");
Douglas Gregorf06cdae2010-01-03 18:01:57 +00001960
1961 // If we found an Objective-C instance variable, let
1962 // LookupInObjCMethod build the appropriate expression to
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001963 // reference the ivar.
Douglas Gregorf06cdae2010-01-03 18:01:57 +00001964 if (ObjCIvarDecl *Ivar = R.getAsSingle<ObjCIvarDecl>()) {
1965 R.clear();
John McCall60d7b3a2010-08-24 06:29:42 +00001966 ExprResult E(LookupInObjCMethod(R, S, Ivar->getIdentifier()));
Douglas Gregorf06cdae2010-01-03 18:01:57 +00001967 assert(E.isInvalid() || E.get());
1968 return move(E);
1969 }
Reid Spencer5f016e22007-07-11 17:01:13 +00001970 }
1971 }
Mike Stump1eb44332009-09-09 15:08:12 +00001972
John McCallf7a1a742009-11-24 19:00:30 +00001973 // This is guaranteed from this point on.
1974 assert(!R.empty() || ADL);
1975
John McCallaa81e162009-12-01 22:10:20 +00001976 // Check whether this might be a C++ implicit instance member access.
John McCallfb97e752010-08-24 22:52:39 +00001977 // C++ [class.mfct.non-static]p3:
1978 // When an id-expression that is not part of a class member access
1979 // syntax and not used to form a pointer to member is used in the
1980 // body of a non-static member function of class X, if name lookup
1981 // resolves the name in the id-expression to a non-static non-type
1982 // member of some class C, the id-expression is transformed into a
1983 // class member access expression using (*this) as the
1984 // postfix-expression to the left of the . operator.
John McCall9c72c602010-08-27 09:08:28 +00001985 //
1986 // But we don't actually need to do this for '&' operands if R
1987 // resolved to a function or overloaded function set, because the
1988 // expression is ill-formed if it actually works out to be a
1989 // non-static member function:
1990 //
1991 // C++ [expr.ref]p4:
1992 // Otherwise, if E1.E2 refers to a non-static member function. . .
1993 // [t]he expression can be used only as the left-hand operand of a
1994 // member function call.
1995 //
1996 // There are other safeguards against such uses, but it's important
1997 // to get this right here so that we don't end up making a
1998 // spuriously dependent expression if we're inside a dependent
1999 // instance method.
John McCall3b4294e2009-12-16 12:17:52 +00002000 if (!R.empty() && (*R.begin())->isCXXClassMember()) {
John McCall9c72c602010-08-27 09:08:28 +00002001 bool MightBeImplicitMember;
2002 if (!isAddressOfOperand)
2003 MightBeImplicitMember = true;
2004 else if (!SS.isEmpty())
2005 MightBeImplicitMember = false;
2006 else if (R.isOverloadedResult())
2007 MightBeImplicitMember = false;
Douglas Gregore2248be2010-08-30 16:00:47 +00002008 else if (R.isUnresolvableResult())
2009 MightBeImplicitMember = true;
John McCall9c72c602010-08-27 09:08:28 +00002010 else
Francois Pichet87c2e122010-11-21 06:08:52 +00002011 MightBeImplicitMember = isa<FieldDecl>(R.getFoundDecl()) ||
2012 isa<IndirectFieldDecl>(R.getFoundDecl());
John McCall9c72c602010-08-27 09:08:28 +00002013
2014 if (MightBeImplicitMember)
John McCall3b4294e2009-12-16 12:17:52 +00002015 return BuildPossibleImplicitMemberExpr(SS, R, TemplateArgs);
John McCall5b3f9132009-11-22 01:44:31 +00002016 }
2017
John McCallf7a1a742009-11-24 19:00:30 +00002018 if (TemplateArgs)
2019 return BuildTemplateIdExpr(SS, R, ADL, *TemplateArgs);
John McCall5b3f9132009-11-22 01:44:31 +00002020
John McCallf7a1a742009-11-24 19:00:30 +00002021 return BuildDeclarationNameExpr(SS, R, ADL);
2022}
2023
John McCall3b4294e2009-12-16 12:17:52 +00002024/// Builds an expression which might be an implicit member expression.
John McCall60d7b3a2010-08-24 06:29:42 +00002025ExprResult
John McCall3b4294e2009-12-16 12:17:52 +00002026Sema::BuildPossibleImplicitMemberExpr(const CXXScopeSpec &SS,
2027 LookupResult &R,
2028 const TemplateArgumentListInfo *TemplateArgs) {
2029 switch (ClassifyImplicitMemberAccess(*this, R)) {
2030 case IMA_Instance:
2031 return BuildImplicitMemberExpr(SS, R, TemplateArgs, true);
2032
John McCall3b4294e2009-12-16 12:17:52 +00002033 case IMA_Mixed:
2034 case IMA_Mixed_Unrelated:
2035 case IMA_Unresolved:
2036 return BuildImplicitMemberExpr(SS, R, TemplateArgs, false);
2037
2038 case IMA_Static:
2039 case IMA_Mixed_StaticContext:
2040 case IMA_Unresolved_StaticContext:
2041 if (TemplateArgs)
2042 return BuildTemplateIdExpr(SS, R, false, *TemplateArgs);
2043 return BuildDeclarationNameExpr(SS, R, false);
2044
2045 case IMA_Error_StaticContext:
2046 case IMA_Error_Unrelated:
John McCall5808ce42011-02-03 08:15:49 +00002047 DiagnoseInstanceReference(*this, SS, R.getRepresentativeDecl(),
2048 R.getLookupNameInfo());
John McCall3b4294e2009-12-16 12:17:52 +00002049 return ExprError();
2050 }
2051
2052 llvm_unreachable("unexpected instance member access kind");
2053 return ExprError();
2054}
2055
John McCall129e2df2009-11-30 22:42:35 +00002056/// BuildQualifiedDeclarationNameExpr - Build a C++ qualified
2057/// declaration name, generally during template instantiation.
2058/// There's a large number of things which don't need to be done along
2059/// this path.
John McCall60d7b3a2010-08-24 06:29:42 +00002060ExprResult
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00002061Sema::BuildQualifiedDeclarationNameExpr(CXXScopeSpec &SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00002062 const DeclarationNameInfo &NameInfo) {
John McCallf7a1a742009-11-24 19:00:30 +00002063 DeclContext *DC;
Douglas Gregore6ec5c42010-04-28 07:04:26 +00002064 if (!(DC = computeDeclContext(SS, false)) || DC->isDependentContext())
Abramo Bagnara25777432010-08-11 22:01:17 +00002065 return BuildDependentDeclRefExpr(SS, NameInfo, 0);
John McCallf7a1a742009-11-24 19:00:30 +00002066
John McCall77bb1aa2010-05-01 00:40:08 +00002067 if (RequireCompleteDeclContext(SS, DC))
Douglas Gregore6ec5c42010-04-28 07:04:26 +00002068 return ExprError();
2069
Abramo Bagnara25777432010-08-11 22:01:17 +00002070 LookupResult R(*this, NameInfo, LookupOrdinaryName);
John McCallf7a1a742009-11-24 19:00:30 +00002071 LookupQualifiedName(R, DC);
2072
2073 if (R.isAmbiguous())
2074 return ExprError();
2075
2076 if (R.empty()) {
Abramo Bagnara25777432010-08-11 22:01:17 +00002077 Diag(NameInfo.getLoc(), diag::err_no_member)
2078 << NameInfo.getName() << DC << SS.getRange();
John McCallf7a1a742009-11-24 19:00:30 +00002079 return ExprError();
2080 }
2081
2082 return BuildDeclarationNameExpr(SS, R, /*ADL*/ false);
2083}
2084
2085/// LookupInObjCMethod - The parser has read a name in, and Sema has
2086/// detected that we're currently inside an ObjC method. Perform some
2087/// additional lookup.
2088///
2089/// Ideally, most of this would be done by lookup, but there's
2090/// actually quite a lot of extra work involved.
2091///
2092/// Returns a null sentinel to indicate trivial success.
John McCall60d7b3a2010-08-24 06:29:42 +00002093ExprResult
John McCallf7a1a742009-11-24 19:00:30 +00002094Sema::LookupInObjCMethod(LookupResult &Lookup, Scope *S,
Chris Lattnereb483eb2010-04-11 08:28:14 +00002095 IdentifierInfo *II, bool AllowBuiltinCreation) {
John McCallf7a1a742009-11-24 19:00:30 +00002096 SourceLocation Loc = Lookup.getNameLoc();
Chris Lattneraec43db2010-04-12 05:10:17 +00002097 ObjCMethodDecl *CurMethod = getCurMethodDecl();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00002098
John McCallf7a1a742009-11-24 19:00:30 +00002099 // There are two cases to handle here. 1) scoped lookup could have failed,
2100 // in which case we should look for an ivar. 2) scoped lookup could have
2101 // found a decl, but that decl is outside the current instance method (i.e.
2102 // a global variable). In these two cases, we do a lookup for an ivar with
2103 // this name, if the lookup sucedes, we replace it our current decl.
2104
2105 // If we're in a class method, we don't normally want to look for
2106 // ivars. But if we don't find anything else, and there's an
2107 // ivar, that's an error.
Chris Lattneraec43db2010-04-12 05:10:17 +00002108 bool IsClassMethod = CurMethod->isClassMethod();
John McCallf7a1a742009-11-24 19:00:30 +00002109
2110 bool LookForIvars;
2111 if (Lookup.empty())
2112 LookForIvars = true;
2113 else if (IsClassMethod)
2114 LookForIvars = false;
2115 else
2116 LookForIvars = (Lookup.isSingleResult() &&
2117 Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod());
Fariborz Jahanian412e7982010-02-09 19:31:38 +00002118 ObjCInterfaceDecl *IFace = 0;
John McCallf7a1a742009-11-24 19:00:30 +00002119 if (LookForIvars) {
Chris Lattneraec43db2010-04-12 05:10:17 +00002120 IFace = CurMethod->getClassInterface();
John McCallf7a1a742009-11-24 19:00:30 +00002121 ObjCInterfaceDecl *ClassDeclared;
2122 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) {
2123 // Diagnose using an ivar in a class method.
2124 if (IsClassMethod)
2125 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method)
2126 << IV->getDeclName());
2127
2128 // If we're referencing an invalid decl, just return this as a silent
2129 // error node. The error diagnostic was already emitted on the decl.
2130 if (IV->isInvalidDecl())
2131 return ExprError();
2132
2133 // Check if referencing a field with __attribute__((deprecated)).
2134 if (DiagnoseUseOfDecl(IV, Loc))
2135 return ExprError();
2136
2137 // Diagnose the use of an ivar outside of the declaring class.
2138 if (IV->getAccessControl() == ObjCIvarDecl::Private &&
2139 ClassDeclared != IFace)
2140 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName();
2141
2142 // FIXME: This should use a new expr for a direct reference, don't
2143 // turn this into Self->ivar, just return a BareIVarExpr or something.
2144 IdentifierInfo &II = Context.Idents.get("self");
2145 UnqualifiedId SelfName;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002146 SelfName.setIdentifier(&II, SourceLocation());
John McCallf7a1a742009-11-24 19:00:30 +00002147 CXXScopeSpec SelfScopeSpec;
John McCall60d7b3a2010-08-24 06:29:42 +00002148 ExprResult SelfExpr = ActOnIdExpression(S, SelfScopeSpec,
Douglas Gregore45bb6a2010-09-22 16:33:13 +00002149 SelfName, false, false);
2150 if (SelfExpr.isInvalid())
2151 return ExprError();
2152
John Wiegley429bb272011-04-08 18:41:53 +00002153 SelfExpr = DefaultLvalueConversion(SelfExpr.take());
2154 if (SelfExpr.isInvalid())
2155 return ExprError();
John McCall409fa9a2010-12-06 20:48:59 +00002156
John McCallf7a1a742009-11-24 19:00:30 +00002157 MarkDeclarationReferenced(Loc, IV);
Fariborz Jahanianb8f17ab2011-04-12 23:39:33 +00002158 Expr *base = SelfExpr.take();
2159 base = base->IgnoreParenImpCasts();
2160 if (const DeclRefExpr *DE = dyn_cast<DeclRefExpr>(base)) {
2161 const NamedDecl *ND = DE->getDecl();
2162 if (!isa<ImplicitParamDecl>(ND)) {
Fariborz Jahanianeefa76e2011-04-15 17:04:42 +00002163 // relax the rule such that it is allowed to have a shadow 'self'
2164 // where stand-alone ivar can be found in this 'self' object.
2165 // This is to match gcc's behavior.
2166 ObjCInterfaceDecl *selfIFace = 0;
2167 if (const ObjCObjectPointerType *OPT =
2168 base->getType()->getAsObjCInterfacePointerType())
2169 selfIFace = OPT->getInterfaceDecl();
2170 if (!selfIFace ||
2171 !selfIFace->lookupInstanceVariable(IV->getIdentifier())) {
Fariborz Jahanianb8f17ab2011-04-12 23:39:33 +00002172 Diag(Loc, diag::error_implicit_ivar_access)
2173 << IV->getDeclName();
2174 Diag(ND->getLocation(), diag::note_declared_at);
2175 return ExprError();
2176 }
Fariborz Jahanianeefa76e2011-04-15 17:04:42 +00002177 }
Fariborz Jahanianb8f17ab2011-04-12 23:39:33 +00002178 }
John McCallf7a1a742009-11-24 19:00:30 +00002179 return Owned(new (Context)
2180 ObjCIvarRefExpr(IV, IV->getType(), Loc,
John Wiegley429bb272011-04-08 18:41:53 +00002181 SelfExpr.take(), true, true));
John McCallf7a1a742009-11-24 19:00:30 +00002182 }
Chris Lattneraec43db2010-04-12 05:10:17 +00002183 } else if (CurMethod->isInstanceMethod()) {
John McCallf7a1a742009-11-24 19:00:30 +00002184 // We should warn if a local variable hides an ivar.
Chris Lattneraec43db2010-04-12 05:10:17 +00002185 ObjCInterfaceDecl *IFace = CurMethod->getClassInterface();
John McCallf7a1a742009-11-24 19:00:30 +00002186 ObjCInterfaceDecl *ClassDeclared;
2187 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) {
2188 if (IV->getAccessControl() != ObjCIvarDecl::Private ||
2189 IFace == ClassDeclared)
2190 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName();
2191 }
2192 }
2193
Fariborz Jahanian48c2d562010-01-12 23:58:59 +00002194 if (Lookup.empty() && II && AllowBuiltinCreation) {
2195 // FIXME. Consolidate this with similar code in LookupName.
2196 if (unsigned BuiltinID = II->getBuiltinID()) {
2197 if (!(getLangOptions().CPlusPlus &&
2198 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))) {
2199 NamedDecl *D = LazilyCreateBuiltin((IdentifierInfo *)II, BuiltinID,
2200 S, Lookup.isForRedeclaration(),
2201 Lookup.getNameLoc());
2202 if (D) Lookup.addDecl(D);
2203 }
2204 }
2205 }
John McCallf7a1a742009-11-24 19:00:30 +00002206 // Sentinel value saying that we didn't do anything special.
2207 return Owned((Expr*) 0);
Douglas Gregor751f9a42009-06-30 15:47:41 +00002208}
John McCallba135432009-11-21 08:51:07 +00002209
John McCall6bb80172010-03-30 21:47:33 +00002210/// \brief Cast a base object to a member's actual type.
2211///
2212/// Logically this happens in three phases:
2213///
2214/// * First we cast from the base type to the naming class.
2215/// The naming class is the class into which we were looking
2216/// when we found the member; it's the qualifier type if a
2217/// qualifier was provided, and otherwise it's the base type.
2218///
2219/// * Next we cast from the naming class to the declaring class.
2220/// If the member we found was brought into a class's scope by
2221/// a using declaration, this is that class; otherwise it's
2222/// the class declaring the member.
2223///
2224/// * Finally we cast from the declaring class to the "true"
2225/// declaring class of the member. This conversion does not
2226/// obey access control.
John Wiegley429bb272011-04-08 18:41:53 +00002227ExprResult
2228Sema::PerformObjectMemberConversion(Expr *From,
Douglas Gregor5fccd362010-03-03 23:55:11 +00002229 NestedNameSpecifier *Qualifier,
John McCall6bb80172010-03-30 21:47:33 +00002230 NamedDecl *FoundDecl,
Douglas Gregor5fccd362010-03-03 23:55:11 +00002231 NamedDecl *Member) {
2232 CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Member->getDeclContext());
2233 if (!RD)
John Wiegley429bb272011-04-08 18:41:53 +00002234 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002235
Douglas Gregor5fccd362010-03-03 23:55:11 +00002236 QualType DestRecordType;
2237 QualType DestType;
2238 QualType FromRecordType;
2239 QualType FromType = From->getType();
2240 bool PointerConversions = false;
2241 if (isa<FieldDecl>(Member)) {
2242 DestRecordType = Context.getCanonicalType(Context.getTypeDeclType(RD));
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002243
Douglas Gregor5fccd362010-03-03 23:55:11 +00002244 if (FromType->getAs<PointerType>()) {
2245 DestType = Context.getPointerType(DestRecordType);
2246 FromRecordType = FromType->getPointeeType();
2247 PointerConversions = true;
2248 } else {
2249 DestType = DestRecordType;
2250 FromRecordType = FromType;
Fariborz Jahanian98a541e2009-07-29 18:40:24 +00002251 }
Douglas Gregor5fccd362010-03-03 23:55:11 +00002252 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) {
2253 if (Method->isStatic())
John Wiegley429bb272011-04-08 18:41:53 +00002254 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002255
Douglas Gregor5fccd362010-03-03 23:55:11 +00002256 DestType = Method->getThisType(Context);
2257 DestRecordType = DestType->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002258
Douglas Gregor5fccd362010-03-03 23:55:11 +00002259 if (FromType->getAs<PointerType>()) {
2260 FromRecordType = FromType->getPointeeType();
2261 PointerConversions = true;
2262 } else {
2263 FromRecordType = FromType;
2264 DestType = DestRecordType;
2265 }
2266 } else {
2267 // No conversion necessary.
John Wiegley429bb272011-04-08 18:41:53 +00002268 return Owned(From);
Douglas Gregor5fccd362010-03-03 23:55:11 +00002269 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002270
Douglas Gregor5fccd362010-03-03 23:55:11 +00002271 if (DestType->isDependentType() || FromType->isDependentType())
John Wiegley429bb272011-04-08 18:41:53 +00002272 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002273
Douglas Gregor5fccd362010-03-03 23:55:11 +00002274 // If the unqualified types are the same, no conversion is necessary.
2275 if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
John Wiegley429bb272011-04-08 18:41:53 +00002276 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002277
John McCall6bb80172010-03-30 21:47:33 +00002278 SourceRange FromRange = From->getSourceRange();
2279 SourceLocation FromLoc = FromRange.getBegin();
2280
John McCall5baba9d2010-08-25 10:28:54 +00002281 ExprValueKind VK = CastCategory(From);
Sebastian Redl906082e2010-07-20 04:20:21 +00002282
Douglas Gregor5fccd362010-03-03 23:55:11 +00002283 // C++ [class.member.lookup]p8:
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002284 // [...] Ambiguities can often be resolved by qualifying a name with its
Douglas Gregor5fccd362010-03-03 23:55:11 +00002285 // class name.
2286 //
2287 // If the member was a qualified name and the qualified referred to a
2288 // specific base subobject type, we'll cast to that intermediate type
2289 // first and then to the object in which the member is declared. That allows
2290 // one to resolve ambiguities in, e.g., a diamond-shaped hierarchy such as:
2291 //
2292 // class Base { public: int x; };
2293 // class Derived1 : public Base { };
2294 // class Derived2 : public Base { };
2295 // class VeryDerived : public Derived1, public Derived2 { void f(); };
2296 //
2297 // void VeryDerived::f() {
2298 // x = 17; // error: ambiguous base subobjects
2299 // Derived1::x = 17; // okay, pick the Base subobject of Derived1
2300 // }
Douglas Gregor5fccd362010-03-03 23:55:11 +00002301 if (Qualifier) {
John McCall6bb80172010-03-30 21:47:33 +00002302 QualType QType = QualType(Qualifier->getAsType(), 0);
2303 assert(!QType.isNull() && "lookup done with dependent qualifier?");
2304 assert(QType->isRecordType() && "lookup done with non-record type");
2305
2306 QualType QRecordType = QualType(QType->getAs<RecordType>(), 0);
2307
2308 // In C++98, the qualifier type doesn't actually have to be a base
2309 // type of the object type, in which case we just ignore it.
2310 // Otherwise build the appropriate casts.
2311 if (IsDerivedFrom(FromRecordType, QRecordType)) {
John McCallf871d0c2010-08-07 06:22:56 +00002312 CXXCastPath BasePath;
John McCall6bb80172010-03-30 21:47:33 +00002313 if (CheckDerivedToBaseConversion(FromRecordType, QRecordType,
Anders Carlssoncee22422010-04-24 19:22:20 +00002314 FromLoc, FromRange, &BasePath))
John Wiegley429bb272011-04-08 18:41:53 +00002315 return ExprError();
John McCall6bb80172010-03-30 21:47:33 +00002316
Douglas Gregor5fccd362010-03-03 23:55:11 +00002317 if (PointerConversions)
John McCall6bb80172010-03-30 21:47:33 +00002318 QType = Context.getPointerType(QType);
John Wiegley429bb272011-04-08 18:41:53 +00002319 From = ImpCastExprToType(From, QType, CK_UncheckedDerivedToBase,
2320 VK, &BasePath).take();
John McCall6bb80172010-03-30 21:47:33 +00002321
2322 FromType = QType;
2323 FromRecordType = QRecordType;
2324
2325 // If the qualifier type was the same as the destination type,
2326 // we're done.
2327 if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
John Wiegley429bb272011-04-08 18:41:53 +00002328 return Owned(From);
Douglas Gregor5fccd362010-03-03 23:55:11 +00002329 }
2330 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002331
John McCall6bb80172010-03-30 21:47:33 +00002332 bool IgnoreAccess = false;
Douglas Gregor5fccd362010-03-03 23:55:11 +00002333
John McCall6bb80172010-03-30 21:47:33 +00002334 // If we actually found the member through a using declaration, cast
2335 // down to the using declaration's type.
2336 //
2337 // Pointer equality is fine here because only one declaration of a
2338 // class ever has member declarations.
2339 if (FoundDecl->getDeclContext() != Member->getDeclContext()) {
2340 assert(isa<UsingShadowDecl>(FoundDecl));
2341 QualType URecordType = Context.getTypeDeclType(
2342 cast<CXXRecordDecl>(FoundDecl->getDeclContext()));
2343
2344 // We only need to do this if the naming-class to declaring-class
2345 // conversion is non-trivial.
2346 if (!Context.hasSameUnqualifiedType(FromRecordType, URecordType)) {
2347 assert(IsDerivedFrom(FromRecordType, URecordType));
John McCallf871d0c2010-08-07 06:22:56 +00002348 CXXCastPath BasePath;
John McCall6bb80172010-03-30 21:47:33 +00002349 if (CheckDerivedToBaseConversion(FromRecordType, URecordType,
Anders Carlssoncee22422010-04-24 19:22:20 +00002350 FromLoc, FromRange, &BasePath))
John Wiegley429bb272011-04-08 18:41:53 +00002351 return ExprError();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00002352
John McCall6bb80172010-03-30 21:47:33 +00002353 QualType UType = URecordType;
2354 if (PointerConversions)
2355 UType = Context.getPointerType(UType);
John Wiegley429bb272011-04-08 18:41:53 +00002356 From = ImpCastExprToType(From, UType, CK_UncheckedDerivedToBase,
2357 VK, &BasePath).take();
John McCall6bb80172010-03-30 21:47:33 +00002358 FromType = UType;
2359 FromRecordType = URecordType;
2360 }
2361
2362 // We don't do access control for the conversion from the
2363 // declaring class to the true declaring class.
2364 IgnoreAccess = true;
Douglas Gregor5fccd362010-03-03 23:55:11 +00002365 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002366
John McCallf871d0c2010-08-07 06:22:56 +00002367 CXXCastPath BasePath;
Anders Carlssoncee22422010-04-24 19:22:20 +00002368 if (CheckDerivedToBaseConversion(FromRecordType, DestRecordType,
2369 FromLoc, FromRange, &BasePath,
John McCall6bb80172010-03-30 21:47:33 +00002370 IgnoreAccess))
John Wiegley429bb272011-04-08 18:41:53 +00002371 return ExprError();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002372
John Wiegley429bb272011-04-08 18:41:53 +00002373 return ImpCastExprToType(From, DestType, CK_UncheckedDerivedToBase,
2374 VK, &BasePath);
Fariborz Jahanian98a541e2009-07-29 18:40:24 +00002375}
Douglas Gregor751f9a42009-06-30 15:47:41 +00002376
Douglas Gregor83f6faf2009-08-31 23:41:50 +00002377/// \brief Build a MemberExpr AST node.
Mike Stump1eb44332009-09-09 15:08:12 +00002378static MemberExpr *BuildMemberExpr(ASTContext &C, Expr *Base, bool isArrow,
Eli Friedmanf595cc42009-12-04 06:40:45 +00002379 const CXXScopeSpec &SS, ValueDecl *Member,
John McCall161755a2010-04-06 21:38:20 +00002380 DeclAccessPair FoundDecl,
Abramo Bagnara25777432010-08-11 22:01:17 +00002381 const DeclarationNameInfo &MemberNameInfo,
2382 QualType Ty,
John McCallf89e55a2010-11-18 06:31:45 +00002383 ExprValueKind VK, ExprObjectKind OK,
John McCallf7a1a742009-11-24 19:00:30 +00002384 const TemplateArgumentListInfo *TemplateArgs = 0) {
Douglas Gregor40d96a62011-02-28 21:54:11 +00002385 return MemberExpr::Create(C, Base, isArrow, SS.getWithLocInContext(C),
Abramo Bagnara25777432010-08-11 22:01:17 +00002386 Member, FoundDecl, MemberNameInfo,
John McCallf89e55a2010-11-18 06:31:45 +00002387 TemplateArgs, Ty, VK, OK);
Douglas Gregorbd4c4ae2009-08-26 22:36:53 +00002388}
2389
John McCalldfa1edb2010-11-23 20:48:44 +00002390static ExprResult
2391BuildFieldReferenceExpr(Sema &S, Expr *BaseExpr, bool IsArrow,
2392 const CXXScopeSpec &SS, FieldDecl *Field,
2393 DeclAccessPair FoundDecl,
2394 const DeclarationNameInfo &MemberNameInfo) {
2395 // x.a is an l-value if 'a' has a reference type. Otherwise:
2396 // x.a is an l-value/x-value/pr-value if the base is (and note
2397 // that *x is always an l-value), except that if the base isn't
2398 // an ordinary object then we must have an rvalue.
2399 ExprValueKind VK = VK_LValue;
2400 ExprObjectKind OK = OK_Ordinary;
2401 if (!IsArrow) {
2402 if (BaseExpr->getObjectKind() == OK_Ordinary)
2403 VK = BaseExpr->getValueKind();
2404 else
2405 VK = VK_RValue;
2406 }
2407 if (VK != VK_RValue && Field->isBitField())
2408 OK = OK_BitField;
2409
2410 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref]
2411 QualType MemberType = Field->getType();
2412 if (const ReferenceType *Ref = MemberType->getAs<ReferenceType>()) {
2413 MemberType = Ref->getPointeeType();
2414 VK = VK_LValue;
2415 } else {
2416 QualType BaseType = BaseExpr->getType();
2417 if (IsArrow) BaseType = BaseType->getAs<PointerType>()->getPointeeType();
2418
2419 Qualifiers BaseQuals = BaseType.getQualifiers();
2420
2421 // GC attributes are never picked up by members.
2422 BaseQuals.removeObjCGCAttr();
2423
2424 // CVR attributes from the base are picked up by members,
2425 // except that 'mutable' members don't pick up 'const'.
2426 if (Field->isMutable()) BaseQuals.removeConst();
2427
2428 Qualifiers MemberQuals
2429 = S.Context.getCanonicalType(MemberType).getQualifiers();
2430
2431 // TR 18037 does not allow fields to be declared with address spaces.
2432 assert(!MemberQuals.hasAddressSpace());
2433
2434 Qualifiers Combined = BaseQuals + MemberQuals;
2435 if (Combined != MemberQuals)
2436 MemberType = S.Context.getQualifiedType(MemberType, Combined);
2437 }
2438
2439 S.MarkDeclarationReferenced(MemberNameInfo.getLoc(), Field);
John Wiegley429bb272011-04-08 18:41:53 +00002440 ExprResult Base =
2441 S.PerformObjectMemberConversion(BaseExpr, SS.getScopeRep(),
2442 FoundDecl, Field);
2443 if (Base.isInvalid())
John McCalldfa1edb2010-11-23 20:48:44 +00002444 return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00002445 return S.Owned(BuildMemberExpr(S.Context, Base.take(), IsArrow, SS,
John McCalldfa1edb2010-11-23 20:48:44 +00002446 Field, FoundDecl, MemberNameInfo,
2447 MemberType, VK, OK));
2448}
2449
John McCallaa81e162009-12-01 22:10:20 +00002450/// Builds an implicit member access expression. The current context
2451/// is known to be an instance method, and the given unqualified lookup
2452/// set is known to contain only instance members, at least one of which
2453/// is from an appropriate type.
John McCall60d7b3a2010-08-24 06:29:42 +00002454ExprResult
John McCallaa81e162009-12-01 22:10:20 +00002455Sema::BuildImplicitMemberExpr(const CXXScopeSpec &SS,
2456 LookupResult &R,
2457 const TemplateArgumentListInfo *TemplateArgs,
2458 bool IsKnownInstance) {
John McCallf7a1a742009-11-24 19:00:30 +00002459 assert(!R.empty() && !R.isAmbiguous());
2460
John McCall5808ce42011-02-03 08:15:49 +00002461 SourceLocation loc = R.getNameLoc();
Sebastian Redlebc07d52009-02-03 20:19:35 +00002462
Douglas Gregorbcbffc42009-01-07 00:43:41 +00002463 // We may have found a field within an anonymous union or struct
2464 // (C++ [class.union]).
John McCallf7a1a742009-11-24 19:00:30 +00002465 // FIXME: template-ids inside anonymous structs?
Francois Pichet87c2e122010-11-21 06:08:52 +00002466 if (IndirectFieldDecl *FD = R.getAsSingle<IndirectFieldDecl>())
John McCall5808ce42011-02-03 08:15:49 +00002467 return BuildAnonymousStructUnionMemberReference(SS, R.getNameLoc(), FD);
Francois Pichet87c2e122010-11-21 06:08:52 +00002468
John McCall5808ce42011-02-03 08:15:49 +00002469 // If this is known to be an instance access, go ahead and build an
2470 // implicit 'this' expression now.
John McCallaa81e162009-12-01 22:10:20 +00002471 // 'this' expression now.
John McCall5808ce42011-02-03 08:15:49 +00002472 CXXMethodDecl *method = tryCaptureCXXThis();
2473 assert(method && "didn't correctly pre-flight capture of 'this'");
2474
2475 QualType thisType = method->getThisType(Context);
2476 Expr *baseExpr = 0; // null signifies implicit access
John McCallaa81e162009-12-01 22:10:20 +00002477 if (IsKnownInstance) {
Douglas Gregor828a1972010-01-07 23:12:05 +00002478 SourceLocation Loc = R.getNameLoc();
2479 if (SS.getRange().isValid())
2480 Loc = SS.getRange().getBegin();
John McCall5808ce42011-02-03 08:15:49 +00002481 baseExpr = new (Context) CXXThisExpr(loc, thisType, /*isImplicit=*/true);
Douglas Gregor88a35142008-12-22 05:46:06 +00002482 }
2483
John McCall5808ce42011-02-03 08:15:49 +00002484 return BuildMemberReferenceExpr(baseExpr, thisType,
John McCallaa81e162009-12-01 22:10:20 +00002485 /*OpLoc*/ SourceLocation(),
2486 /*IsArrow*/ true,
John McCallc2233c52010-01-15 08:34:02 +00002487 SS,
2488 /*FirstQualifierInScope*/ 0,
2489 R, TemplateArgs);
John McCallba135432009-11-21 08:51:07 +00002490}
2491
John McCallf7a1a742009-11-24 19:00:30 +00002492bool Sema::UseArgumentDependentLookup(const CXXScopeSpec &SS,
John McCall5b3f9132009-11-22 01:44:31 +00002493 const LookupResult &R,
2494 bool HasTrailingLParen) {
John McCallba135432009-11-21 08:51:07 +00002495 // Only when used directly as the postfix-expression of a call.
2496 if (!HasTrailingLParen)
2497 return false;
2498
2499 // Never if a scope specifier was provided.
John McCallf7a1a742009-11-24 19:00:30 +00002500 if (SS.isSet())
John McCallba135432009-11-21 08:51:07 +00002501 return false;
2502
2503 // Only in C++ or ObjC++.
John McCall5b3f9132009-11-22 01:44:31 +00002504 if (!getLangOptions().CPlusPlus)
John McCallba135432009-11-21 08:51:07 +00002505 return false;
2506
2507 // Turn off ADL when we find certain kinds of declarations during
2508 // normal lookup:
2509 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
2510 NamedDecl *D = *I;
2511
2512 // C++0x [basic.lookup.argdep]p3:
2513 // -- a declaration of a class member
2514 // Since using decls preserve this property, we check this on the
2515 // original decl.
John McCall3b4294e2009-12-16 12:17:52 +00002516 if (D->isCXXClassMember())
John McCallba135432009-11-21 08:51:07 +00002517 return false;
2518
2519 // C++0x [basic.lookup.argdep]p3:
2520 // -- a block-scope function declaration that is not a
2521 // using-declaration
2522 // NOTE: we also trigger this for function templates (in fact, we
2523 // don't check the decl type at all, since all other decl types
2524 // turn off ADL anyway).
2525 if (isa<UsingShadowDecl>(D))
2526 D = cast<UsingShadowDecl>(D)->getTargetDecl();
2527 else if (D->getDeclContext()->isFunctionOrMethod())
2528 return false;
2529
2530 // C++0x [basic.lookup.argdep]p3:
2531 // -- a declaration that is neither a function or a function
2532 // template
2533 // And also for builtin functions.
2534 if (isa<FunctionDecl>(D)) {
2535 FunctionDecl *FDecl = cast<FunctionDecl>(D);
2536
2537 // But also builtin functions.
2538 if (FDecl->getBuiltinID() && FDecl->isImplicit())
2539 return false;
2540 } else if (!isa<FunctionTemplateDecl>(D))
2541 return false;
2542 }
2543
2544 return true;
2545}
2546
2547
John McCallba135432009-11-21 08:51:07 +00002548/// Diagnoses obvious problems with the use of the given declaration
2549/// as an expression. This is only actually called for lookups that
2550/// were not overloaded, and it doesn't promise that the declaration
2551/// will in fact be used.
2552static bool CheckDeclInExpr(Sema &S, SourceLocation Loc, NamedDecl *D) {
Richard Smith162e1c12011-04-15 14:24:37 +00002553 if (isa<TypedefNameDecl>(D)) {
John McCallba135432009-11-21 08:51:07 +00002554 S.Diag(Loc, diag::err_unexpected_typedef) << D->getDeclName();
2555 return true;
2556 }
2557
2558 if (isa<ObjCInterfaceDecl>(D)) {
2559 S.Diag(Loc, diag::err_unexpected_interface) << D->getDeclName();
2560 return true;
2561 }
2562
2563 if (isa<NamespaceDecl>(D)) {
2564 S.Diag(Loc, diag::err_unexpected_namespace) << D->getDeclName();
2565 return true;
2566 }
2567
2568 return false;
2569}
2570
John McCall60d7b3a2010-08-24 06:29:42 +00002571ExprResult
John McCallf7a1a742009-11-24 19:00:30 +00002572Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
John McCall5b3f9132009-11-22 01:44:31 +00002573 LookupResult &R,
2574 bool NeedsADL) {
John McCallfead20c2009-12-08 22:45:53 +00002575 // If this is a single, fully-resolved result and we don't need ADL,
2576 // just build an ordinary singleton decl ref.
Douglas Gregor86b8e092010-01-29 17:15:43 +00002577 if (!NeedsADL && R.isSingleResult() && !R.getAsSingle<FunctionTemplateDecl>())
Abramo Bagnara25777432010-08-11 22:01:17 +00002578 return BuildDeclarationNameExpr(SS, R.getLookupNameInfo(),
2579 R.getFoundDecl());
John McCallba135432009-11-21 08:51:07 +00002580
2581 // We only need to check the declaration if there's exactly one
2582 // result, because in the overloaded case the results can only be
2583 // functions and function templates.
John McCall5b3f9132009-11-22 01:44:31 +00002584 if (R.isSingleResult() &&
2585 CheckDeclInExpr(*this, R.getNameLoc(), R.getFoundDecl()))
John McCallba135432009-11-21 08:51:07 +00002586 return ExprError();
2587
John McCallc373d482010-01-27 01:50:18 +00002588 // Otherwise, just build an unresolved lookup expression. Suppress
2589 // any lookup-related diagnostics; we'll hash these out later, when
2590 // we've picked a target.
2591 R.suppressDiagnostics();
2592
John McCallba135432009-11-21 08:51:07 +00002593 UnresolvedLookupExpr *ULE
Douglas Gregorbebbe0d2010-12-15 01:34:56 +00002594 = UnresolvedLookupExpr::Create(Context, R.getNamingClass(),
Douglas Gregor4c9be892011-02-28 20:01:57 +00002595 SS.getWithLocInContext(Context),
2596 R.getLookupNameInfo(),
Douglas Gregor5a84dec2010-05-23 18:57:34 +00002597 NeedsADL, R.isOverloadedResult(),
2598 R.begin(), R.end());
John McCallba135432009-11-21 08:51:07 +00002599
2600 return Owned(ULE);
2601}
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002602
John McCallba135432009-11-21 08:51:07 +00002603/// \brief Complete semantic analysis for a reference to the given declaration.
John McCall60d7b3a2010-08-24 06:29:42 +00002604ExprResult
John McCallf7a1a742009-11-24 19:00:30 +00002605Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00002606 const DeclarationNameInfo &NameInfo,
2607 NamedDecl *D) {
John McCallba135432009-11-21 08:51:07 +00002608 assert(D && "Cannot refer to a NULL declaration");
John McCall7453ed42009-11-22 00:44:51 +00002609 assert(!isa<FunctionTemplateDecl>(D) &&
2610 "Cannot refer unambiguously to a function template");
John McCallba135432009-11-21 08:51:07 +00002611
Abramo Bagnara25777432010-08-11 22:01:17 +00002612 SourceLocation Loc = NameInfo.getLoc();
John McCallba135432009-11-21 08:51:07 +00002613 if (CheckDeclInExpr(*this, Loc, D))
2614 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00002615
Douglas Gregor9af2f522009-12-01 16:58:18 +00002616 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) {
2617 // Specifically diagnose references to class templates that are missing
2618 // a template argument list.
2619 Diag(Loc, diag::err_template_decl_ref)
2620 << Template << SS.getRange();
2621 Diag(Template->getLocation(), diag::note_template_decl_here);
2622 return ExprError();
2623 }
2624
2625 // Make sure that we're referring to a value.
2626 ValueDecl *VD = dyn_cast<ValueDecl>(D);
2627 if (!VD) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002628 Diag(Loc, diag::err_ref_non_value)
Douglas Gregor9af2f522009-12-01 16:58:18 +00002629 << D << SS.getRange();
John McCall87cf6702009-12-18 18:35:10 +00002630 Diag(D->getLocation(), diag::note_declared_at);
Douglas Gregor9af2f522009-12-01 16:58:18 +00002631 return ExprError();
2632 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002633
Douglas Gregor48f3bb92009-02-18 21:56:37 +00002634 // Check whether this declaration can be used. Note that we suppress
2635 // this check when we're going to perform argument-dependent lookup
2636 // on this function name, because this might not be the function
2637 // that overload resolution actually selects.
John McCallba135432009-11-21 08:51:07 +00002638 if (DiagnoseUseOfDecl(VD, Loc))
Douglas Gregor48f3bb92009-02-18 21:56:37 +00002639 return ExprError();
2640
Steve Naroffdd972f22008-09-05 22:11:13 +00002641 // Only create DeclRefExpr's for valid Decl's.
2642 if (VD->isInvalidDecl())
Sebastian Redlcd965b92009-01-18 18:53:16 +00002643 return ExprError();
2644
John McCall5808ce42011-02-03 08:15:49 +00002645 // Handle members of anonymous structs and unions. If we got here,
2646 // and the reference is to a class member indirect field, then this
2647 // must be the subject of a pointer-to-member expression.
2648 if (IndirectFieldDecl *indirectField = dyn_cast<IndirectFieldDecl>(VD))
2649 if (!indirectField->isCXXClassMember())
2650 return BuildAnonymousStructUnionMemberReference(SS, NameInfo.getLoc(),
2651 indirectField);
Francois Pichet87c2e122010-11-21 06:08:52 +00002652
Chris Lattner639e2d32008-10-20 05:16:36 +00002653 // If the identifier reference is inside a block, and it refers to a value
2654 // that is outside the block, create a BlockDeclRefExpr instead of a
2655 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when
2656 // the block is formed.
Steve Naroffdd972f22008-09-05 22:11:13 +00002657 //
Chris Lattner639e2d32008-10-20 05:16:36 +00002658 // We do not do this for things like enum constants, global variables, etc,
2659 // as they do not get snapshotted.
2660 //
John McCall6b5a61b2011-02-07 10:33:21 +00002661 switch (shouldCaptureValueReference(*this, NameInfo.getLoc(), VD)) {
John McCall469a1eb2011-02-02 13:00:07 +00002662 case CR_Error:
2663 return ExprError();
Mike Stump0d6fd572010-01-05 02:56:35 +00002664
John McCall469a1eb2011-02-02 13:00:07 +00002665 case CR_Capture:
John McCall6b5a61b2011-02-07 10:33:21 +00002666 assert(!SS.isSet() && "referenced local variable with scope specifier?");
2667 return BuildBlockDeclRefExpr(*this, VD, NameInfo, /*byref*/ false);
2668
2669 case CR_CaptureByRef:
2670 assert(!SS.isSet() && "referenced local variable with scope specifier?");
2671 return BuildBlockDeclRefExpr(*this, VD, NameInfo, /*byref*/ true);
John McCall76a40212011-02-09 01:13:10 +00002672
2673 case CR_NoCapture: {
2674 // If this reference is not in a block or if the referenced
2675 // variable is within the block, create a normal DeclRefExpr.
2676
2677 QualType type = VD->getType();
Daniel Dunbarb20de812011-02-10 18:29:28 +00002678 ExprValueKind valueKind = VK_RValue;
John McCall76a40212011-02-09 01:13:10 +00002679
2680 switch (D->getKind()) {
2681 // Ignore all the non-ValueDecl kinds.
2682#define ABSTRACT_DECL(kind)
2683#define VALUE(type, base)
2684#define DECL(type, base) \
2685 case Decl::type:
2686#include "clang/AST/DeclNodes.inc"
2687 llvm_unreachable("invalid value decl kind");
2688 return ExprError();
2689
2690 // These shouldn't make it here.
2691 case Decl::ObjCAtDefsField:
2692 case Decl::ObjCIvar:
2693 llvm_unreachable("forming non-member reference to ivar?");
2694 return ExprError();
2695
2696 // Enum constants are always r-values and never references.
2697 // Unresolved using declarations are dependent.
2698 case Decl::EnumConstant:
2699 case Decl::UnresolvedUsingValue:
2700 valueKind = VK_RValue;
2701 break;
2702
2703 // Fields and indirect fields that got here must be for
2704 // pointer-to-member expressions; we just call them l-values for
2705 // internal consistency, because this subexpression doesn't really
2706 // exist in the high-level semantics.
2707 case Decl::Field:
2708 case Decl::IndirectField:
2709 assert(getLangOptions().CPlusPlus &&
2710 "building reference to field in C?");
2711
2712 // These can't have reference type in well-formed programs, but
2713 // for internal consistency we do this anyway.
2714 type = type.getNonReferenceType();
2715 valueKind = VK_LValue;
2716 break;
2717
2718 // Non-type template parameters are either l-values or r-values
2719 // depending on the type.
2720 case Decl::NonTypeTemplateParm: {
2721 if (const ReferenceType *reftype = type->getAs<ReferenceType>()) {
2722 type = reftype->getPointeeType();
2723 valueKind = VK_LValue; // even if the parameter is an r-value reference
2724 break;
2725 }
2726
2727 // For non-references, we need to strip qualifiers just in case
2728 // the template parameter was declared as 'const int' or whatever.
2729 valueKind = VK_RValue;
2730 type = type.getUnqualifiedType();
2731 break;
2732 }
2733
2734 case Decl::Var:
2735 // In C, "extern void blah;" is valid and is an r-value.
2736 if (!getLangOptions().CPlusPlus &&
2737 !type.hasQualifiers() &&
2738 type->isVoidType()) {
2739 valueKind = VK_RValue;
2740 break;
2741 }
2742 // fallthrough
2743
2744 case Decl::ImplicitParam:
2745 case Decl::ParmVar:
2746 // These are always l-values.
2747 valueKind = VK_LValue;
2748 type = type.getNonReferenceType();
2749 break;
2750
2751 case Decl::Function: {
John McCall755d8492011-04-12 00:42:48 +00002752 const FunctionType *fty = type->castAs<FunctionType>();
2753
2754 // If we're referring to a function with an __unknown_anytype
2755 // result type, make the entire expression __unknown_anytype.
2756 if (fty->getResultType() == Context.UnknownAnyTy) {
2757 type = Context.UnknownAnyTy;
2758 valueKind = VK_RValue;
2759 break;
2760 }
2761
John McCall76a40212011-02-09 01:13:10 +00002762 // Functions are l-values in C++.
2763 if (getLangOptions().CPlusPlus) {
2764 valueKind = VK_LValue;
2765 break;
2766 }
2767
2768 // C99 DR 316 says that, if a function type comes from a
2769 // function definition (without a prototype), that type is only
2770 // used for checking compatibility. Therefore, when referencing
2771 // the function, we pretend that we don't have the full function
2772 // type.
John McCall755d8492011-04-12 00:42:48 +00002773 if (!cast<FunctionDecl>(VD)->hasPrototype() &&
2774 isa<FunctionProtoType>(fty))
2775 type = Context.getFunctionNoProtoType(fty->getResultType(),
2776 fty->getExtInfo());
John McCall76a40212011-02-09 01:13:10 +00002777
2778 // Functions are r-values in C.
2779 valueKind = VK_RValue;
2780 break;
2781 }
2782
2783 case Decl::CXXMethod:
John McCall755d8492011-04-12 00:42:48 +00002784 // If we're referring to a method with an __unknown_anytype
2785 // result type, make the entire expression __unknown_anytype.
2786 // This should only be possible with a type written directly.
2787 if (const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(VD->getType()))
2788 if (proto->getResultType() == Context.UnknownAnyTy) {
2789 type = Context.UnknownAnyTy;
2790 valueKind = VK_RValue;
2791 break;
2792 }
2793
John McCall76a40212011-02-09 01:13:10 +00002794 // C++ methods are l-values if static, r-values if non-static.
2795 if (cast<CXXMethodDecl>(VD)->isStatic()) {
2796 valueKind = VK_LValue;
2797 break;
2798 }
2799 // fallthrough
2800
2801 case Decl::CXXConversion:
2802 case Decl::CXXDestructor:
2803 case Decl::CXXConstructor:
2804 valueKind = VK_RValue;
2805 break;
2806 }
2807
2808 return BuildDeclRefExpr(VD, type, valueKind, NameInfo, &SS);
2809 }
2810
John McCall469a1eb2011-02-02 13:00:07 +00002811 }
John McCallf89e55a2010-11-18 06:31:45 +00002812
John McCall6b5a61b2011-02-07 10:33:21 +00002813 llvm_unreachable("unknown capture result");
2814 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00002815}
2816
John McCall755d8492011-04-12 00:42:48 +00002817ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, tok::TokenKind Kind) {
Chris Lattnerd9f69102008-08-10 01:53:14 +00002818 PredefinedExpr::IdentType IT;
Sebastian Redlcd965b92009-01-18 18:53:16 +00002819
Reid Spencer5f016e22007-07-11 17:01:13 +00002820 switch (Kind) {
Chris Lattner1423ea42008-01-12 18:39:25 +00002821 default: assert(0 && "Unknown simple primary expr!");
Chris Lattnerd9f69102008-08-10 01:53:14 +00002822 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2]
2823 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break;
2824 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00002825 }
Chris Lattner1423ea42008-01-12 18:39:25 +00002826
Chris Lattnerfa28b302008-01-12 08:14:25 +00002827 // Pre-defined identifiers are of type char[x], where x is the length of the
2828 // string.
Mike Stump1eb44332009-09-09 15:08:12 +00002829
Anders Carlsson3a082d82009-09-08 18:24:21 +00002830 Decl *currentDecl = getCurFunctionOrMethodDecl();
Fariborz Jahanianeb024ac2010-07-23 21:53:24 +00002831 if (!currentDecl && getCurBlock())
2832 currentDecl = getCurBlock()->TheDecl;
Anders Carlsson3a082d82009-09-08 18:24:21 +00002833 if (!currentDecl) {
Chris Lattnerb0da9232008-12-12 05:05:20 +00002834 Diag(Loc, diag::ext_predef_outside_function);
Anders Carlsson3a082d82009-09-08 18:24:21 +00002835 currentDecl = Context.getTranslationUnitDecl();
Chris Lattnerb0da9232008-12-12 05:05:20 +00002836 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002837
Anders Carlsson773f3972009-09-11 01:22:35 +00002838 QualType ResTy;
2839 if (cast<DeclContext>(currentDecl)->isDependentContext()) {
2840 ResTy = Context.DependentTy;
2841 } else {
Anders Carlsson848fa642010-02-11 18:20:28 +00002842 unsigned Length = PredefinedExpr::ComputeName(IT, currentDecl).length();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002843
Anders Carlsson773f3972009-09-11 01:22:35 +00002844 llvm::APInt LengthI(32, Length + 1);
John McCall0953e762009-09-24 19:53:00 +00002845 ResTy = Context.CharTy.withConst();
Anders Carlsson773f3972009-09-11 01:22:35 +00002846 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0);
2847 }
Steve Naroff6ece14c2009-01-21 00:14:39 +00002848 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT));
Reid Spencer5f016e22007-07-11 17:01:13 +00002849}
2850
John McCall60d7b3a2010-08-24 06:29:42 +00002851ExprResult Sema::ActOnCharacterConstant(const Token &Tok) {
Reid Spencer5f016e22007-07-11 17:01:13 +00002852 llvm::SmallString<16> CharBuffer;
Douglas Gregor453091c2010-03-16 22:30:13 +00002853 bool Invalid = false;
2854 llvm::StringRef ThisTok = PP.getSpelling(Tok, CharBuffer, &Invalid);
2855 if (Invalid)
2856 return ExprError();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002857
Benjamin Kramerddeea562010-02-27 13:44:12 +00002858 CharLiteralParser Literal(ThisTok.begin(), ThisTok.end(), Tok.getLocation(),
2859 PP);
Reid Spencer5f016e22007-07-11 17:01:13 +00002860 if (Literal.hadError())
Sebastian Redlcd965b92009-01-18 18:53:16 +00002861 return ExprError();
Chris Lattnerfc62bfd2008-03-01 08:32:21 +00002862
Chris Lattnere8337df2009-12-30 21:19:39 +00002863 QualType Ty;
2864 if (!getLangOptions().CPlusPlus)
2865 Ty = Context.IntTy; // 'x' and L'x' -> int in C.
2866 else if (Literal.isWide())
2867 Ty = Context.WCharTy; // L'x' -> wchar_t in C++.
Eli Friedman136b0cd2010-02-03 18:21:45 +00002868 else if (Literal.isMultiChar())
2869 Ty = Context.IntTy; // 'wxyz' -> int in C++.
Chris Lattnere8337df2009-12-30 21:19:39 +00002870 else
2871 Ty = Context.CharTy; // 'x' -> char in C++
Chris Lattnerfc62bfd2008-03-01 08:32:21 +00002872
Sebastian Redle91b3bc2009-01-20 22:23:13 +00002873 return Owned(new (Context) CharacterLiteral(Literal.getValue(),
2874 Literal.isWide(),
Chris Lattnere8337df2009-12-30 21:19:39 +00002875 Ty, Tok.getLocation()));
Reid Spencer5f016e22007-07-11 17:01:13 +00002876}
2877
John McCall60d7b3a2010-08-24 06:29:42 +00002878ExprResult Sema::ActOnNumericConstant(const Token &Tok) {
Sebastian Redlcd965b92009-01-18 18:53:16 +00002879 // Fast path for a single digit (which is quite common). A single digit
Reid Spencer5f016e22007-07-11 17:01:13 +00002880 // cannot have a trigraph, escaped newline, radix prefix, or type suffix.
2881 if (Tok.getLength() == 1) {
Chris Lattner7216dc92009-01-26 22:36:52 +00002882 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok);
Chris Lattner0c21e842009-01-16 07:10:29 +00002883 unsigned IntSize = Context.Target.getIntWidth();
Argyrios Kyrtzidis9996a7f2010-08-28 09:06:06 +00002884 return Owned(IntegerLiteral::Create(Context, llvm::APInt(IntSize, Val-'0'),
Steve Naroff0a473932009-01-20 19:53:53 +00002885 Context.IntTy, Tok.getLocation()));
Reid Spencer5f016e22007-07-11 17:01:13 +00002886 }
Ted Kremenek28396602009-01-13 23:19:12 +00002887
Reid Spencer5f016e22007-07-11 17:01:13 +00002888 llvm::SmallString<512> IntegerBuffer;
Chris Lattner2a299042008-09-30 20:53:45 +00002889 // Add padding so that NumericLiteralParser can overread by one character.
2890 IntegerBuffer.resize(Tok.getLength()+1);
Reid Spencer5f016e22007-07-11 17:01:13 +00002891 const char *ThisTokBegin = &IntegerBuffer[0];
Sebastian Redlcd965b92009-01-18 18:53:16 +00002892
Reid Spencer5f016e22007-07-11 17:01:13 +00002893 // Get the spelling of the token, which eliminates trigraphs, etc.
Douglas Gregor453091c2010-03-16 22:30:13 +00002894 bool Invalid = false;
2895 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin, &Invalid);
2896 if (Invalid)
2897 return ExprError();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002898
Mike Stump1eb44332009-09-09 15:08:12 +00002899 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength,
Reid Spencer5f016e22007-07-11 17:01:13 +00002900 Tok.getLocation(), PP);
2901 if (Literal.hadError)
Sebastian Redlcd965b92009-01-18 18:53:16 +00002902 return ExprError();
2903
Chris Lattner5d661452007-08-26 03:42:43 +00002904 Expr *Res;
Sebastian Redlcd965b92009-01-18 18:53:16 +00002905
Chris Lattner5d661452007-08-26 03:42:43 +00002906 if (Literal.isFloatingLiteral()) {
Chris Lattner525a0502007-09-22 18:29:59 +00002907 QualType Ty;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002908 if (Literal.isFloat)
Chris Lattner525a0502007-09-22 18:29:59 +00002909 Ty = Context.FloatTy;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002910 else if (!Literal.isLong)
Chris Lattner525a0502007-09-22 18:29:59 +00002911 Ty = Context.DoubleTy;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002912 else
Chris Lattner9e9b6dc2008-03-08 08:52:55 +00002913 Ty = Context.LongDoubleTy;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002914
2915 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty);
2916
John McCall94c939d2009-12-24 09:08:04 +00002917 using llvm::APFloat;
2918 APFloat Val(Format);
2919
2920 APFloat::opStatus result = Literal.GetFloatValue(Val);
John McCall9f2df882009-12-24 11:09:08 +00002921
2922 // Overflow is always an error, but underflow is only an error if
2923 // we underflowed to zero (APFloat reports denormals as underflow).
2924 if ((result & APFloat::opOverflow) ||
2925 ((result & APFloat::opUnderflow) && Val.isZero())) {
John McCall94c939d2009-12-24 09:08:04 +00002926 unsigned diagnostic;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002927 llvm::SmallString<20> buffer;
John McCall94c939d2009-12-24 09:08:04 +00002928 if (result & APFloat::opOverflow) {
John McCall2a0d7572010-02-26 23:35:57 +00002929 diagnostic = diag::warn_float_overflow;
John McCall94c939d2009-12-24 09:08:04 +00002930 APFloat::getLargest(Format).toString(buffer);
2931 } else {
John McCall2a0d7572010-02-26 23:35:57 +00002932 diagnostic = diag::warn_float_underflow;
John McCall94c939d2009-12-24 09:08:04 +00002933 APFloat::getSmallest(Format).toString(buffer);
2934 }
2935
2936 Diag(Tok.getLocation(), diagnostic)
2937 << Ty
2938 << llvm::StringRef(buffer.data(), buffer.size());
2939 }
2940
2941 bool isExact = (result == APFloat::opOK);
Argyrios Kyrtzidis9996a7f2010-08-28 09:06:06 +00002942 Res = FloatingLiteral::Create(Context, Val, isExact, Ty, Tok.getLocation());
Sebastian Redlcd965b92009-01-18 18:53:16 +00002943
Peter Collingbournef4f7cb82011-03-11 19:24:59 +00002944 if (Ty == Context.DoubleTy) {
2945 if (getLangOptions().SinglePrecisionConstants) {
John Wiegley429bb272011-04-08 18:41:53 +00002946 Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).take();
Peter Collingbournef4f7cb82011-03-11 19:24:59 +00002947 } else if (getLangOptions().OpenCL && !getOpenCLOptions().cl_khr_fp64) {
2948 Diag(Tok.getLocation(), diag::warn_double_const_requires_fp64);
John Wiegley429bb272011-04-08 18:41:53 +00002949 Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).take();
Peter Collingbournef4f7cb82011-03-11 19:24:59 +00002950 }
2951 }
Chris Lattner5d661452007-08-26 03:42:43 +00002952 } else if (!Literal.isIntegerLiteral()) {
Sebastian Redlcd965b92009-01-18 18:53:16 +00002953 return ExprError();
Chris Lattner5d661452007-08-26 03:42:43 +00002954 } else {
Chris Lattnerf0467b32008-04-02 04:24:33 +00002955 QualType Ty;
Reid Spencer5f016e22007-07-11 17:01:13 +00002956
Neil Boothb9449512007-08-29 22:00:19 +00002957 // long long is a C99 feature.
2958 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x &&
Neil Booth79859c32007-08-29 22:13:52 +00002959 Literal.isLongLong)
Neil Boothb9449512007-08-29 22:00:19 +00002960 Diag(Tok.getLocation(), diag::ext_longlong);
2961
Reid Spencer5f016e22007-07-11 17:01:13 +00002962 // Get the value in the widest-possible width.
Chris Lattner98be4942008-03-05 18:54:05 +00002963 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0);
Sebastian Redlcd965b92009-01-18 18:53:16 +00002964
Reid Spencer5f016e22007-07-11 17:01:13 +00002965 if (Literal.GetIntegerValue(ResultVal)) {
2966 // If this value didn't fit into uintmax_t, warn and force to ull.
2967 Diag(Tok.getLocation(), diag::warn_integer_too_large);
Chris Lattnerf0467b32008-04-02 04:24:33 +00002968 Ty = Context.UnsignedLongLongTy;
2969 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() &&
Chris Lattner98be4942008-03-05 18:54:05 +00002970 "long long is not intmax_t?");
Reid Spencer5f016e22007-07-11 17:01:13 +00002971 } else {
2972 // If this value fits into a ULL, try to figure out what else it fits into
2973 // according to the rules of C99 6.4.4.1p5.
Sebastian Redlcd965b92009-01-18 18:53:16 +00002974
Reid Spencer5f016e22007-07-11 17:01:13 +00002975 // Octal, Hexadecimal, and integers with a U suffix are allowed to
2976 // be an unsigned int.
2977 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10;
2978
2979 // Check from smallest to largest, picking the smallest type we can.
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002980 unsigned Width = 0;
Chris Lattner97c51562007-08-23 21:58:08 +00002981 if (!Literal.isLong && !Literal.isLongLong) {
2982 // Are int/unsigned possibilities?
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002983 unsigned IntSize = Context.Target.getIntWidth();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002984
Reid Spencer5f016e22007-07-11 17:01:13 +00002985 // Does it fit in a unsigned int?
2986 if (ResultVal.isIntN(IntSize)) {
2987 // Does it fit in a signed int?
2988 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002989 Ty = Context.IntTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00002990 else if (AllowUnsigned)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002991 Ty = Context.UnsignedIntTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002992 Width = IntSize;
Reid Spencer5f016e22007-07-11 17:01:13 +00002993 }
Reid Spencer5f016e22007-07-11 17:01:13 +00002994 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002995
Reid Spencer5f016e22007-07-11 17:01:13 +00002996 // Are long/unsigned long possibilities?
Chris Lattnerf0467b32008-04-02 04:24:33 +00002997 if (Ty.isNull() && !Literal.isLongLong) {
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002998 unsigned LongSize = Context.Target.getLongWidth();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002999
Reid Spencer5f016e22007-07-11 17:01:13 +00003000 // Does it fit in a unsigned long?
3001 if (ResultVal.isIntN(LongSize)) {
3002 // Does it fit in a signed long?
3003 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0)
Chris Lattnerf0467b32008-04-02 04:24:33 +00003004 Ty = Context.LongTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00003005 else if (AllowUnsigned)
Chris Lattnerf0467b32008-04-02 04:24:33 +00003006 Ty = Context.UnsignedLongTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00003007 Width = LongSize;
Reid Spencer5f016e22007-07-11 17:01:13 +00003008 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00003009 }
3010
Reid Spencer5f016e22007-07-11 17:01:13 +00003011 // Finally, check long long if needed.
Chris Lattnerf0467b32008-04-02 04:24:33 +00003012 if (Ty.isNull()) {
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00003013 unsigned LongLongSize = Context.Target.getLongLongWidth();
Sebastian Redlcd965b92009-01-18 18:53:16 +00003014
Reid Spencer5f016e22007-07-11 17:01:13 +00003015 // Does it fit in a unsigned long long?
3016 if (ResultVal.isIntN(LongLongSize)) {
3017 // Does it fit in a signed long long?
Francois Pichet24323202011-01-11 23:38:13 +00003018 // To be compatible with MSVC, hex integer literals ending with the
3019 // LL or i64 suffix are always signed in Microsoft mode.
Francois Picheta15a5ee2011-01-11 12:23:00 +00003020 if (!Literal.isUnsigned && (ResultVal[LongLongSize-1] == 0 ||
3021 (getLangOptions().Microsoft && Literal.isLongLong)))
Chris Lattnerf0467b32008-04-02 04:24:33 +00003022 Ty = Context.LongLongTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00003023 else if (AllowUnsigned)
Chris Lattnerf0467b32008-04-02 04:24:33 +00003024 Ty = Context.UnsignedLongLongTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00003025 Width = LongLongSize;
Reid Spencer5f016e22007-07-11 17:01:13 +00003026 }
3027 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00003028
Reid Spencer5f016e22007-07-11 17:01:13 +00003029 // If we still couldn't decide a type, we probably have something that
3030 // does not fit in a signed long long, but has no U suffix.
Chris Lattnerf0467b32008-04-02 04:24:33 +00003031 if (Ty.isNull()) {
Reid Spencer5f016e22007-07-11 17:01:13 +00003032 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed);
Chris Lattnerf0467b32008-04-02 04:24:33 +00003033 Ty = Context.UnsignedLongLongTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00003034 Width = Context.Target.getLongLongWidth();
Reid Spencer5f016e22007-07-11 17:01:13 +00003035 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00003036
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00003037 if (ResultVal.getBitWidth() != Width)
Jay Foad9f71a8f2010-12-07 08:25:34 +00003038 ResultVal = ResultVal.trunc(Width);
Reid Spencer5f016e22007-07-11 17:01:13 +00003039 }
Argyrios Kyrtzidis9996a7f2010-08-28 09:06:06 +00003040 Res = IntegerLiteral::Create(Context, ResultVal, Ty, Tok.getLocation());
Reid Spencer5f016e22007-07-11 17:01:13 +00003041 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00003042
Chris Lattner5d661452007-08-26 03:42:43 +00003043 // If this is an imaginary literal, create the ImaginaryLiteral wrapper.
3044 if (Literal.isImaginary)
Mike Stump1eb44332009-09-09 15:08:12 +00003045 Res = new (Context) ImaginaryLiteral(Res,
Steve Naroff6ece14c2009-01-21 00:14:39 +00003046 Context.getComplexType(Res->getType()));
Sebastian Redlcd965b92009-01-18 18:53:16 +00003047
3048 return Owned(Res);
Reid Spencer5f016e22007-07-11 17:01:13 +00003049}
3050
John McCall60d7b3a2010-08-24 06:29:42 +00003051ExprResult Sema::ActOnParenExpr(SourceLocation L,
John McCall9ae2f072010-08-23 23:25:46 +00003052 SourceLocation R, Expr *E) {
Chris Lattnerf0467b32008-04-02 04:24:33 +00003053 assert((E != 0) && "ActOnParenExpr() missing expr");
Steve Naroff6ece14c2009-01-21 00:14:39 +00003054 return Owned(new (Context) ParenExpr(L, R, E));
Reid Spencer5f016e22007-07-11 17:01:13 +00003055}
3056
Chandler Carruthdf1f3772011-05-26 08:53:12 +00003057static bool CheckVecStepTraitOperandType(Sema &S, QualType T,
3058 SourceLocation Loc,
3059 SourceRange ArgRange) {
3060 // [OpenCL 1.1 6.11.12] "The vec_step built-in function takes a built-in
3061 // scalar or vector data type argument..."
3062 // Every built-in scalar type (OpenCL 1.1 6.1.1) is either an arithmetic
3063 // type (C99 6.2.5p18) or void.
3064 if (!(T->isArithmeticType() || T->isVoidType() || T->isVectorType())) {
3065 S.Diag(Loc, diag::err_vecstep_non_scalar_vector_type)
3066 << T << ArgRange;
3067 return true;
3068 }
3069
3070 assert((T->isVoidType() || !T->isIncompleteType()) &&
3071 "Scalar types should always be complete");
3072 return false;
3073}
3074
Chandler Carruth42ec65d2011-05-26 08:53:16 +00003075static bool CheckExtensionTraitOperandType(Sema &S, QualType T,
3076 SourceLocation Loc,
3077 SourceRange ArgRange,
3078 UnaryExprOrTypeTrait TraitKind) {
3079 // C99 6.5.3.4p1:
3080 if (T->isFunctionType()) {
3081 // alignof(function) is allowed as an extension.
3082 if (TraitKind == UETT_SizeOf)
3083 S.Diag(Loc, diag::ext_sizeof_function_type) << ArgRange;
3084 return false;
3085 }
3086
3087 // Allow sizeof(void)/alignof(void) as an extension.
3088 if (T->isVoidType()) {
3089 S.Diag(Loc, diag::ext_sizeof_void_type) << TraitKind << ArgRange;
3090 return false;
3091 }
3092
3093 return true;
3094}
3095
3096static bool CheckObjCTraitOperandConstraints(Sema &S, QualType T,
3097 SourceLocation Loc,
3098 SourceRange ArgRange,
3099 UnaryExprOrTypeTrait TraitKind) {
3100 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode.
3101 if (S.LangOpts.ObjCNonFragileABI && T->isObjCObjectType()) {
3102 S.Diag(Loc, diag::err_sizeof_nonfragile_interface)
3103 << T << (TraitKind == UETT_SizeOf)
3104 << ArgRange;
3105 return true;
3106 }
3107
3108 return false;
3109}
3110
Chandler Carruth9d342d02011-05-26 08:53:10 +00003111/// \brief Check the constrains on expression operands to unary type expression
3112/// and type traits.
3113///
Chandler Carruthe4d645c2011-05-27 01:33:31 +00003114/// Completes any types necessary and validates the constraints on the operand
3115/// expression. The logic mostly mirrors the type-based overload, but may modify
3116/// the expression as it completes the type for that expression through template
3117/// instantiation, etc.
Chandler Carruth9d342d02011-05-26 08:53:10 +00003118bool Sema::CheckUnaryExprOrTypeTraitOperand(Expr *Op,
3119 UnaryExprOrTypeTrait ExprKind) {
Chandler Carruthe4d645c2011-05-27 01:33:31 +00003120 QualType ExprTy = Op->getType();
3121
3122 // C++ [expr.sizeof]p2: "When applied to a reference or a reference type,
3123 // the result is the size of the referenced type."
3124 // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the
3125 // result shall be the alignment of the referenced type."
3126 if (const ReferenceType *Ref = ExprTy->getAs<ReferenceType>())
3127 ExprTy = Ref->getPointeeType();
3128
3129 if (ExprKind == UETT_VecStep)
3130 return CheckVecStepTraitOperandType(*this, ExprTy, Op->getExprLoc(),
3131 Op->getSourceRange());
3132
3133 // Whitelist some types as extensions
3134 if (!CheckExtensionTraitOperandType(*this, ExprTy, Op->getExprLoc(),
3135 Op->getSourceRange(), ExprKind))
3136 return false;
3137
3138 if (RequireCompleteExprType(Op,
3139 PDiag(diag::err_sizeof_alignof_incomplete_type)
3140 << ExprKind << Op->getSourceRange(),
3141 std::make_pair(SourceLocation(), PDiag(0))))
3142 return true;
3143
3144 // Completeing the expression's type may have changed it.
3145 ExprTy = Op->getType();
3146 if (const ReferenceType *Ref = ExprTy->getAs<ReferenceType>())
3147 ExprTy = Ref->getPointeeType();
3148
3149 if (CheckObjCTraitOperandConstraints(*this, ExprTy, Op->getExprLoc(),
3150 Op->getSourceRange(), ExprKind))
3151 return true;
3152
3153 return false;
Chandler Carruth9d342d02011-05-26 08:53:10 +00003154}
3155
3156/// \brief Check the constraints on operands to unary expression and type
3157/// traits.
3158///
3159/// This will complete any types necessary, and validate the various constraints
3160/// on those operands.
3161///
Reid Spencer5f016e22007-07-11 17:01:13 +00003162/// The UsualUnaryConversions() function is *not* called by this routine.
Chandler Carruth9d342d02011-05-26 08:53:10 +00003163/// C99 6.3.2.1p[2-4] all state:
3164/// Except when it is the operand of the sizeof operator ...
3165///
3166/// C++ [expr.sizeof]p4
3167/// The lvalue-to-rvalue, array-to-pointer, and function-to-pointer
3168/// standard conversions are not applied to the operand of sizeof.
3169///
3170/// This policy is followed for all of the unary trait expressions.
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003171bool Sema::CheckUnaryExprOrTypeTraitOperand(QualType exprType,
3172 SourceLocation OpLoc,
3173 SourceRange ExprRange,
3174 UnaryExprOrTypeTrait ExprKind) {
Sebastian Redl28507842009-02-26 14:39:58 +00003175 if (exprType->isDependentType())
3176 return false;
3177
Sebastian Redl5d484e82009-11-23 17:18:46 +00003178 // C++ [expr.sizeof]p2: "When applied to a reference or a reference type,
3179 // the result is the size of the referenced type."
3180 // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the
3181 // result shall be the alignment of the referenced type."
3182 if (const ReferenceType *Ref = exprType->getAs<ReferenceType>())
3183 exprType = Ref->getPointeeType();
3184
Chandler Carruthdf1f3772011-05-26 08:53:12 +00003185 if (ExprKind == UETT_VecStep)
3186 return CheckVecStepTraitOperandType(*this, exprType, OpLoc, ExprRange);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003187
Chandler Carruth42ec65d2011-05-26 08:53:16 +00003188 // Whitelist some types as extensions
3189 if (!CheckExtensionTraitOperandType(*this, exprType, OpLoc, ExprRange,
3190 ExprKind))
Chris Lattner01072922009-01-24 19:46:37 +00003191 return false;
Mike Stump1eb44332009-09-09 15:08:12 +00003192
Chris Lattner1efaa952009-04-24 00:30:45 +00003193 if (RequireCompleteType(OpLoc, exprType,
Douglas Gregor5cc07df2009-12-15 16:44:32 +00003194 PDiag(diag::err_sizeof_alignof_incomplete_type)
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003195 << ExprKind << ExprRange))
Chris Lattner1efaa952009-04-24 00:30:45 +00003196 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00003197
Chandler Carruth42ec65d2011-05-26 08:53:16 +00003198 if (CheckObjCTraitOperandConstraints(*this, exprType, OpLoc, ExprRange,
3199 ExprKind))
Chris Lattner5cb10d32009-04-24 22:30:50 +00003200 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00003201
Chris Lattner1efaa952009-04-24 00:30:45 +00003202 return false;
Reid Spencer5f016e22007-07-11 17:01:13 +00003203}
3204
Chandler Carruth9d342d02011-05-26 08:53:10 +00003205static bool CheckAlignOfExpr(Sema &S, Expr *E) {
Chris Lattner31e21e02009-01-24 20:17:12 +00003206 E = E->IgnoreParens();
Sebastian Redl28507842009-02-26 14:39:58 +00003207
Mike Stump1eb44332009-09-09 15:08:12 +00003208 // alignof decl is always ok.
Chris Lattner31e21e02009-01-24 20:17:12 +00003209 if (isa<DeclRefExpr>(E))
3210 return false;
Sebastian Redl28507842009-02-26 14:39:58 +00003211
3212 // Cannot know anything else if the expression is dependent.
3213 if (E->isTypeDependent())
3214 return false;
3215
Douglas Gregor33bbbc52009-05-02 02:18:30 +00003216 if (E->getBitField()) {
Chandler Carruth9d342d02011-05-26 08:53:10 +00003217 S.Diag(E->getExprLoc(), diag::err_sizeof_alignof_bitfield)
3218 << 1 << E->getSourceRange();
Douglas Gregor33bbbc52009-05-02 02:18:30 +00003219 return true;
Chris Lattner31e21e02009-01-24 20:17:12 +00003220 }
Douglas Gregor33bbbc52009-05-02 02:18:30 +00003221
3222 // Alignment of a field access is always okay, so long as it isn't a
3223 // bit-field.
3224 if (MemberExpr *ME = dyn_cast<MemberExpr>(E))
Mike Stump8e1fab22009-07-22 18:58:19 +00003225 if (isa<FieldDecl>(ME->getMemberDecl()))
Douglas Gregor33bbbc52009-05-02 02:18:30 +00003226 return false;
3227
Chandler Carruth9d342d02011-05-26 08:53:10 +00003228 return S.CheckUnaryExprOrTypeTraitOperand(E, UETT_AlignOf);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003229}
3230
Chandler Carruth9d342d02011-05-26 08:53:10 +00003231bool Sema::CheckVecStepExpr(Expr *E) {
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003232 E = E->IgnoreParens();
3233
3234 // Cannot know anything else if the expression is dependent.
3235 if (E->isTypeDependent())
3236 return false;
3237
Chandler Carruth9d342d02011-05-26 08:53:10 +00003238 return CheckUnaryExprOrTypeTraitOperand(E, UETT_VecStep);
Chris Lattner31e21e02009-01-24 20:17:12 +00003239}
3240
Douglas Gregorba498172009-03-13 21:01:28 +00003241/// \brief Build a sizeof or alignof expression given a type operand.
John McCall60d7b3a2010-08-24 06:29:42 +00003242ExprResult
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003243Sema::CreateUnaryExprOrTypeTraitExpr(TypeSourceInfo *TInfo,
3244 SourceLocation OpLoc,
3245 UnaryExprOrTypeTrait ExprKind,
3246 SourceRange R) {
John McCalla93c9342009-12-07 02:54:59 +00003247 if (!TInfo)
Douglas Gregorba498172009-03-13 21:01:28 +00003248 return ExprError();
3249
John McCalla93c9342009-12-07 02:54:59 +00003250 QualType T = TInfo->getType();
John McCall5ab75172009-11-04 07:28:41 +00003251
Douglas Gregorba498172009-03-13 21:01:28 +00003252 if (!T->isDependentType() &&
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003253 CheckUnaryExprOrTypeTraitOperand(T, OpLoc, R, ExprKind))
Douglas Gregorba498172009-03-13 21:01:28 +00003254 return ExprError();
3255
3256 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003257 return Owned(new (Context) UnaryExprOrTypeTraitExpr(ExprKind, TInfo,
3258 Context.getSizeType(),
3259 OpLoc, R.getEnd()));
Douglas Gregorba498172009-03-13 21:01:28 +00003260}
3261
3262/// \brief Build a sizeof or alignof expression given an expression
3263/// operand.
John McCall60d7b3a2010-08-24 06:29:42 +00003264ExprResult
Chandler Carruthe72c55b2011-05-29 07:32:14 +00003265Sema::CreateUnaryExprOrTypeTraitExpr(Expr *E, SourceLocation OpLoc,
3266 UnaryExprOrTypeTrait ExprKind) {
Douglas Gregorba498172009-03-13 21:01:28 +00003267 // Verify that the operand is valid.
3268 bool isInvalid = false;
3269 if (E->isTypeDependent()) {
3270 // Delay type-checking for type-dependent expressions.
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003271 } else if (ExprKind == UETT_AlignOf) {
Chandler Carruth9d342d02011-05-26 08:53:10 +00003272 isInvalid = CheckAlignOfExpr(*this, E);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003273 } else if (ExprKind == UETT_VecStep) {
Chandler Carruth9d342d02011-05-26 08:53:10 +00003274 isInvalid = CheckVecStepExpr(E);
Douglas Gregor33bbbc52009-05-02 02:18:30 +00003275 } else if (E->getBitField()) { // C99 6.5.3.4p1.
Chandler Carruth9d342d02011-05-26 08:53:10 +00003276 Diag(E->getExprLoc(), diag::err_sizeof_alignof_bitfield) << 0;
Douglas Gregorba498172009-03-13 21:01:28 +00003277 isInvalid = true;
John McCall2cd11fe2010-10-12 02:09:17 +00003278 } else if (E->getType()->isPlaceholderType()) {
John McCallfb8721c2011-04-10 19:13:55 +00003279 ExprResult PE = CheckPlaceholderExpr(E);
John McCall2cd11fe2010-10-12 02:09:17 +00003280 if (PE.isInvalid()) return ExprError();
Chandler Carruthe72c55b2011-05-29 07:32:14 +00003281 return CreateUnaryExprOrTypeTraitExpr(PE.take(), OpLoc, ExprKind);
Douglas Gregorba498172009-03-13 21:01:28 +00003282 } else {
Chandler Carruth9d342d02011-05-26 08:53:10 +00003283 isInvalid = CheckUnaryExprOrTypeTraitOperand(E, UETT_SizeOf);
Douglas Gregorba498172009-03-13 21:01:28 +00003284 }
3285
3286 if (isInvalid)
3287 return ExprError();
3288
3289 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
Chandler Carruth9d342d02011-05-26 08:53:10 +00003290 return Owned(new (Context) UnaryExprOrTypeTraitExpr(
Chandler Carruthe72c55b2011-05-29 07:32:14 +00003291 ExprKind, E, Context.getSizeType(), OpLoc,
Chandler Carruth9d342d02011-05-26 08:53:10 +00003292 E->getSourceRange().getEnd()));
Douglas Gregorba498172009-03-13 21:01:28 +00003293}
3294
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003295/// ActOnUnaryExprOrTypeTraitExpr - Handle @c sizeof(type) and @c sizeof @c
3296/// expr and the same for @c alignof and @c __alignof
Sebastian Redl05189992008-11-11 17:56:53 +00003297/// Note that the ArgRange is invalid if isType is false.
John McCall60d7b3a2010-08-24 06:29:42 +00003298ExprResult
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003299Sema::ActOnUnaryExprOrTypeTraitExpr(SourceLocation OpLoc,
3300 UnaryExprOrTypeTrait ExprKind, bool isType,
3301 void *TyOrEx, const SourceRange &ArgRange) {
Reid Spencer5f016e22007-07-11 17:01:13 +00003302 // If error parsing type, ignore.
Sebastian Redl0eb23302009-01-19 00:08:26 +00003303 if (TyOrEx == 0) return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00003304
Sebastian Redl05189992008-11-11 17:56:53 +00003305 if (isType) {
John McCalla93c9342009-12-07 02:54:59 +00003306 TypeSourceInfo *TInfo;
John McCallb3d87482010-08-24 05:47:05 +00003307 (void) GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrEx), &TInfo);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003308 return CreateUnaryExprOrTypeTraitExpr(TInfo, OpLoc, ExprKind, ArgRange);
Mike Stump1eb44332009-09-09 15:08:12 +00003309 }
Sebastian Redl05189992008-11-11 17:56:53 +00003310
Douglas Gregorba498172009-03-13 21:01:28 +00003311 Expr *ArgEx = (Expr *)TyOrEx;
Chandler Carruthe72c55b2011-05-29 07:32:14 +00003312 ExprResult Result = CreateUnaryExprOrTypeTraitExpr(ArgEx, OpLoc, ExprKind);
Douglas Gregorba498172009-03-13 21:01:28 +00003313 return move(Result);
Reid Spencer5f016e22007-07-11 17:01:13 +00003314}
3315
John Wiegley429bb272011-04-08 18:41:53 +00003316static QualType CheckRealImagOperand(Sema &S, ExprResult &V, SourceLocation Loc,
John McCall09431682010-11-18 19:01:18 +00003317 bool isReal) {
John Wiegley429bb272011-04-08 18:41:53 +00003318 if (V.get()->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00003319 return S.Context.DependentTy;
Mike Stump1eb44332009-09-09 15:08:12 +00003320
John McCallf6a16482010-12-04 03:47:34 +00003321 // _Real and _Imag are only l-values for normal l-values.
John Wiegley429bb272011-04-08 18:41:53 +00003322 if (V.get()->getObjectKind() != OK_Ordinary) {
3323 V = S.DefaultLvalueConversion(V.take());
3324 if (V.isInvalid())
3325 return QualType();
3326 }
John McCallf6a16482010-12-04 03:47:34 +00003327
Chris Lattnercc26ed72007-08-26 05:39:26 +00003328 // These operators return the element type of a complex type.
John Wiegley429bb272011-04-08 18:41:53 +00003329 if (const ComplexType *CT = V.get()->getType()->getAs<ComplexType>())
Chris Lattnerdbb36972007-08-24 21:16:53 +00003330 return CT->getElementType();
Mike Stump1eb44332009-09-09 15:08:12 +00003331
Chris Lattnercc26ed72007-08-26 05:39:26 +00003332 // Otherwise they pass through real integer and floating point types here.
John Wiegley429bb272011-04-08 18:41:53 +00003333 if (V.get()->getType()->isArithmeticType())
3334 return V.get()->getType();
Mike Stump1eb44332009-09-09 15:08:12 +00003335
John McCall2cd11fe2010-10-12 02:09:17 +00003336 // Test for placeholders.
John McCallfb8721c2011-04-10 19:13:55 +00003337 ExprResult PR = S.CheckPlaceholderExpr(V.get());
John McCall2cd11fe2010-10-12 02:09:17 +00003338 if (PR.isInvalid()) return QualType();
John Wiegley429bb272011-04-08 18:41:53 +00003339 if (PR.get() != V.get()) {
3340 V = move(PR);
John McCall09431682010-11-18 19:01:18 +00003341 return CheckRealImagOperand(S, V, Loc, isReal);
John McCall2cd11fe2010-10-12 02:09:17 +00003342 }
3343
Chris Lattnercc26ed72007-08-26 05:39:26 +00003344 // Reject anything else.
John Wiegley429bb272011-04-08 18:41:53 +00003345 S.Diag(Loc, diag::err_realimag_invalid_type) << V.get()->getType()
Chris Lattnerba27e2a2009-02-17 08:12:06 +00003346 << (isReal ? "__real" : "__imag");
Chris Lattnercc26ed72007-08-26 05:39:26 +00003347 return QualType();
Chris Lattnerdbb36972007-08-24 21:16:53 +00003348}
3349
3350
Reid Spencer5f016e22007-07-11 17:01:13 +00003351
John McCall60d7b3a2010-08-24 06:29:42 +00003352ExprResult
Sebastian Redl0eb23302009-01-19 00:08:26 +00003353Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc,
John McCall9ae2f072010-08-23 23:25:46 +00003354 tok::TokenKind Kind, Expr *Input) {
John McCall2de56d12010-08-25 11:45:40 +00003355 UnaryOperatorKind Opc;
Reid Spencer5f016e22007-07-11 17:01:13 +00003356 switch (Kind) {
3357 default: assert(0 && "Unknown unary op!");
John McCall2de56d12010-08-25 11:45:40 +00003358 case tok::plusplus: Opc = UO_PostInc; break;
3359 case tok::minusminus: Opc = UO_PostDec; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00003360 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00003361
John McCall9ae2f072010-08-23 23:25:46 +00003362 return BuildUnaryOp(S, OpLoc, Opc, Input);
Reid Spencer5f016e22007-07-11 17:01:13 +00003363}
3364
John McCall09431682010-11-18 19:01:18 +00003365/// Expressions of certain arbitrary types are forbidden by C from
3366/// having l-value type. These are:
3367/// - 'void', but not qualified void
3368/// - function types
3369///
3370/// The exact rule here is C99 6.3.2.1:
3371/// An lvalue is an expression with an object type or an incomplete
3372/// type other than void.
3373static bool IsCForbiddenLValueType(ASTContext &C, QualType T) {
3374 return ((T->isVoidType() && !T.hasQualifiers()) ||
3375 T->isFunctionType());
3376}
3377
John McCall60d7b3a2010-08-24 06:29:42 +00003378ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003379Sema::ActOnArraySubscriptExpr(Scope *S, Expr *Base, SourceLocation LLoc,
3380 Expr *Idx, SourceLocation RLoc) {
Nate Begeman2ef13e52009-08-10 23:49:36 +00003381 // Since this might be a postfix expression, get rid of ParenListExprs.
John McCall60d7b3a2010-08-24 06:29:42 +00003382 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base);
John McCall9ae2f072010-08-23 23:25:46 +00003383 if (Result.isInvalid()) return ExprError();
3384 Base = Result.take();
Nate Begeman2ef13e52009-08-10 23:49:36 +00003385
John McCall9ae2f072010-08-23 23:25:46 +00003386 Expr *LHSExp = Base, *RHSExp = Idx;
Mike Stump1eb44332009-09-09 15:08:12 +00003387
Douglas Gregor337c6b92008-11-19 17:17:41 +00003388 if (getLangOptions().CPlusPlus &&
Douglas Gregor3384c9c2009-05-19 00:01:19 +00003389 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) {
Douglas Gregor3384c9c2009-05-19 00:01:19 +00003390 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp,
John McCallf89e55a2010-11-18 06:31:45 +00003391 Context.DependentTy,
3392 VK_LValue, OK_Ordinary,
3393 RLoc));
Douglas Gregor3384c9c2009-05-19 00:01:19 +00003394 }
3395
Mike Stump1eb44332009-09-09 15:08:12 +00003396 if (getLangOptions().CPlusPlus &&
Sebastian Redl0eb23302009-01-19 00:08:26 +00003397 (LHSExp->getType()->isRecordType() ||
Eli Friedman03f332a2008-12-15 22:34:21 +00003398 LHSExp->getType()->isEnumeralType() ||
3399 RHSExp->getType()->isRecordType() ||
3400 RHSExp->getType()->isEnumeralType())) {
John McCall9ae2f072010-08-23 23:25:46 +00003401 return CreateOverloadedArraySubscriptExpr(LLoc, RLoc, Base, Idx);
Douglas Gregor337c6b92008-11-19 17:17:41 +00003402 }
3403
John McCall9ae2f072010-08-23 23:25:46 +00003404 return CreateBuiltinArraySubscriptExpr(Base, LLoc, Idx, RLoc);
Sebastian Redlf322ed62009-10-29 20:17:01 +00003405}
3406
3407
John McCall60d7b3a2010-08-24 06:29:42 +00003408ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003409Sema::CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc,
3410 Expr *Idx, SourceLocation RLoc) {
3411 Expr *LHSExp = Base;
3412 Expr *RHSExp = Idx;
Sebastian Redlf322ed62009-10-29 20:17:01 +00003413
Chris Lattner12d9ff62007-07-16 00:14:47 +00003414 // Perform default conversions.
John Wiegley429bb272011-04-08 18:41:53 +00003415 if (!LHSExp->getType()->getAs<VectorType>()) {
3416 ExprResult Result = DefaultFunctionArrayLvalueConversion(LHSExp);
3417 if (Result.isInvalid())
3418 return ExprError();
3419 LHSExp = Result.take();
3420 }
3421 ExprResult Result = DefaultFunctionArrayLvalueConversion(RHSExp);
3422 if (Result.isInvalid())
3423 return ExprError();
3424 RHSExp = Result.take();
Sebastian Redl0eb23302009-01-19 00:08:26 +00003425
Chris Lattner12d9ff62007-07-16 00:14:47 +00003426 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType();
John McCallf89e55a2010-11-18 06:31:45 +00003427 ExprValueKind VK = VK_LValue;
3428 ExprObjectKind OK = OK_Ordinary;
Reid Spencer5f016e22007-07-11 17:01:13 +00003429
Reid Spencer5f016e22007-07-11 17:01:13 +00003430 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent
Chris Lattner73d0d4f2007-08-30 17:45:32 +00003431 // to the expression *((e1)+(e2)). This means the array "Base" may actually be
Mike Stumpeed9cac2009-02-19 03:04:26 +00003432 // in the subscript position. As a result, we need to derive the array base
Reid Spencer5f016e22007-07-11 17:01:13 +00003433 // and index from the expression types.
Chris Lattner12d9ff62007-07-16 00:14:47 +00003434 Expr *BaseExpr, *IndexExpr;
3435 QualType ResultType;
Sebastian Redl28507842009-02-26 14:39:58 +00003436 if (LHSTy->isDependentType() || RHSTy->isDependentType()) {
3437 BaseExpr = LHSExp;
3438 IndexExpr = RHSExp;
3439 ResultType = Context.DependentTy;
Ted Kremenek6217b802009-07-29 21:53:49 +00003440 } else if (const PointerType *PTy = LHSTy->getAs<PointerType>()) {
Chris Lattner12d9ff62007-07-16 00:14:47 +00003441 BaseExpr = LHSExp;
3442 IndexExpr = RHSExp;
Chris Lattner12d9ff62007-07-16 00:14:47 +00003443 ResultType = PTy->getPointeeType();
Ted Kremenek6217b802009-07-29 21:53:49 +00003444 } else if (const PointerType *PTy = RHSTy->getAs<PointerType>()) {
Chris Lattner7a2e0472007-07-16 00:23:25 +00003445 // Handle the uncommon case of "123[Ptr]".
Chris Lattner12d9ff62007-07-16 00:14:47 +00003446 BaseExpr = RHSExp;
3447 IndexExpr = LHSExp;
Chris Lattner12d9ff62007-07-16 00:14:47 +00003448 ResultType = PTy->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00003449 } else if (const ObjCObjectPointerType *PTy =
John McCall183700f2009-09-21 23:43:11 +00003450 LHSTy->getAs<ObjCObjectPointerType>()) {
Steve Naroff14108da2009-07-10 23:34:53 +00003451 BaseExpr = LHSExp;
3452 IndexExpr = RHSExp;
3453 ResultType = PTy->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00003454 } else if (const ObjCObjectPointerType *PTy =
John McCall183700f2009-09-21 23:43:11 +00003455 RHSTy->getAs<ObjCObjectPointerType>()) {
Steve Naroff14108da2009-07-10 23:34:53 +00003456 // Handle the uncommon case of "123[Ptr]".
3457 BaseExpr = RHSExp;
3458 IndexExpr = LHSExp;
3459 ResultType = PTy->getPointeeType();
John McCall183700f2009-09-21 23:43:11 +00003460 } else if (const VectorType *VTy = LHSTy->getAs<VectorType>()) {
Chris Lattnerc8629632007-07-31 19:29:30 +00003461 BaseExpr = LHSExp; // vectors: V[123]
Chris Lattner12d9ff62007-07-16 00:14:47 +00003462 IndexExpr = RHSExp;
John McCallf89e55a2010-11-18 06:31:45 +00003463 VK = LHSExp->getValueKind();
3464 if (VK != VK_RValue)
3465 OK = OK_VectorComponent;
Nate Begeman334a8022009-01-18 00:45:31 +00003466
Chris Lattner12d9ff62007-07-16 00:14:47 +00003467 // FIXME: need to deal with const...
3468 ResultType = VTy->getElementType();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003469 } else if (LHSTy->isArrayType()) {
3470 // If we see an array that wasn't promoted by
Douglas Gregora873dfc2010-02-03 00:27:59 +00003471 // DefaultFunctionArrayLvalueConversion, it must be an array that
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003472 // wasn't promoted because of the C90 rule that doesn't
3473 // allow promoting non-lvalue arrays. Warn, then
3474 // force the promotion here.
3475 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) <<
3476 LHSExp->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00003477 LHSExp = ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy),
3478 CK_ArrayToPointerDecay).take();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003479 LHSTy = LHSExp->getType();
3480
3481 BaseExpr = LHSExp;
3482 IndexExpr = RHSExp;
Ted Kremenek6217b802009-07-29 21:53:49 +00003483 ResultType = LHSTy->getAs<PointerType>()->getPointeeType();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003484 } else if (RHSTy->isArrayType()) {
3485 // Same as previous, except for 123[f().a] case
3486 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) <<
3487 RHSExp->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00003488 RHSExp = ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy),
3489 CK_ArrayToPointerDecay).take();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003490 RHSTy = RHSExp->getType();
3491
3492 BaseExpr = RHSExp;
3493 IndexExpr = LHSExp;
Ted Kremenek6217b802009-07-29 21:53:49 +00003494 ResultType = RHSTy->getAs<PointerType>()->getPointeeType();
Reid Spencer5f016e22007-07-11 17:01:13 +00003495 } else {
Chris Lattner338395d2009-04-25 22:50:55 +00003496 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value)
3497 << LHSExp->getSourceRange() << RHSExp->getSourceRange());
Sebastian Redl0eb23302009-01-19 00:08:26 +00003498 }
Reid Spencer5f016e22007-07-11 17:01:13 +00003499 // C99 6.5.2.1p1
Douglas Gregorf6094622010-07-23 15:58:24 +00003500 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent())
Chris Lattner338395d2009-04-25 22:50:55 +00003501 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer)
3502 << IndexExpr->getSourceRange());
Reid Spencer5f016e22007-07-11 17:01:13 +00003503
Daniel Dunbar7e88a602009-09-17 06:31:17 +00003504 if ((IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
Sam Weinig0f9a5b52009-09-14 20:14:57 +00003505 IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
3506 && !IndexExpr->isTypeDependent())
Sam Weinig76e2b712009-09-14 01:58:58 +00003507 Diag(LLoc, diag::warn_subscript_is_char) << IndexExpr->getSourceRange();
3508
Douglas Gregore7450f52009-03-24 19:52:54 +00003509 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly,
Mike Stump1eb44332009-09-09 15:08:12 +00003510 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object
3511 // type. Note that Functions are not objects, and that (in C99 parlance)
Douglas Gregore7450f52009-03-24 19:52:54 +00003512 // incomplete types are not object types.
3513 if (ResultType->isFunctionType()) {
3514 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type)
3515 << ResultType << BaseExpr->getSourceRange();
3516 return ExprError();
3517 }
Mike Stump1eb44332009-09-09 15:08:12 +00003518
Abramo Bagnara46358452010-09-13 06:50:07 +00003519 if (ResultType->isVoidType() && !getLangOptions().CPlusPlus) {
3520 // GNU extension: subscripting on pointer to void
3521 Diag(LLoc, diag::ext_gnu_void_ptr)
3522 << BaseExpr->getSourceRange();
John McCall09431682010-11-18 19:01:18 +00003523
3524 // C forbids expressions of unqualified void type from being l-values.
3525 // See IsCForbiddenLValueType.
3526 if (!ResultType.hasQualifiers()) VK = VK_RValue;
Abramo Bagnara46358452010-09-13 06:50:07 +00003527 } else if (!ResultType->isDependentType() &&
Mike Stump1eb44332009-09-09 15:08:12 +00003528 RequireCompleteType(LLoc, ResultType,
Anders Carlssonb7906612009-08-26 23:45:07 +00003529 PDiag(diag::err_subscript_incomplete_type)
3530 << BaseExpr->getSourceRange()))
Douglas Gregore7450f52009-03-24 19:52:54 +00003531 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00003532
Chris Lattner1efaa952009-04-24 00:30:45 +00003533 // Diagnose bad cases where we step over interface counts.
John McCallc12c5bb2010-05-15 11:32:37 +00003534 if (ResultType->isObjCObjectType() && LangOpts.ObjCNonFragileABI) {
Chris Lattner1efaa952009-04-24 00:30:45 +00003535 Diag(LLoc, diag::err_subscript_nonfragile_interface)
3536 << ResultType << BaseExpr->getSourceRange();
3537 return ExprError();
3538 }
Mike Stump1eb44332009-09-09 15:08:12 +00003539
John McCall09431682010-11-18 19:01:18 +00003540 assert(VK == VK_RValue || LangOpts.CPlusPlus ||
3541 !IsCForbiddenLValueType(Context, ResultType));
3542
Mike Stumpeed9cac2009-02-19 03:04:26 +00003543 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp,
John McCallf89e55a2010-11-18 06:31:45 +00003544 ResultType, VK, OK, RLoc));
Reid Spencer5f016e22007-07-11 17:01:13 +00003545}
3546
John McCall09431682010-11-18 19:01:18 +00003547/// Check an ext-vector component access expression.
3548///
3549/// VK should be set in advance to the value kind of the base
3550/// expression.
3551static QualType
3552CheckExtVectorComponent(Sema &S, QualType baseType, ExprValueKind &VK,
3553 SourceLocation OpLoc, const IdentifierInfo *CompName,
Anders Carlsson8f28f992009-08-26 18:25:21 +00003554 SourceLocation CompLoc) {
Daniel Dunbar2ad32892009-10-18 02:09:38 +00003555 // FIXME: Share logic with ExtVectorElementExpr::containsDuplicateElements,
3556 // see FIXME there.
3557 //
3558 // FIXME: This logic can be greatly simplified by splitting it along
3559 // halving/not halving and reworking the component checking.
John McCall183700f2009-09-21 23:43:11 +00003560 const ExtVectorType *vecType = baseType->getAs<ExtVectorType>();
Nate Begeman8a997642008-05-09 06:41:27 +00003561
Steve Naroffe1b31fe2007-07-27 22:15:19 +00003562 // The vector accessor can't exceed the number of elements.
Daniel Dunbare013d682009-10-18 20:26:12 +00003563 const char *compStr = CompName->getNameStart();
Nate Begeman353417a2009-01-18 01:47:54 +00003564
Mike Stumpeed9cac2009-02-19 03:04:26 +00003565 // This flag determines whether or not the component is one of the four
Nate Begeman353417a2009-01-18 01:47:54 +00003566 // special names that indicate a subset of exactly half the elements are
3567 // to be selected.
3568 bool HalvingSwizzle = false;
Mike Stumpeed9cac2009-02-19 03:04:26 +00003569
Nate Begeman353417a2009-01-18 01:47:54 +00003570 // This flag determines whether or not CompName has an 's' char prefix,
3571 // indicating that it is a string of hex values to be used as vector indices.
Nate Begeman131f4652009-06-25 21:06:09 +00003572 bool HexSwizzle = *compStr == 's' || *compStr == 'S';
Nate Begeman8a997642008-05-09 06:41:27 +00003573
John McCall09431682010-11-18 19:01:18 +00003574 bool HasRepeated = false;
3575 bool HasIndex[16] = {};
3576
3577 int Idx;
3578
Nate Begeman8a997642008-05-09 06:41:27 +00003579 // Check that we've found one of the special components, or that the component
3580 // names must come from the same set.
Mike Stumpeed9cac2009-02-19 03:04:26 +00003581 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") ||
Nate Begeman353417a2009-01-18 01:47:54 +00003582 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) {
3583 HalvingSwizzle = true;
John McCall09431682010-11-18 19:01:18 +00003584 } else if (!HexSwizzle &&
3585 (Idx = vecType->getPointAccessorIdx(*compStr)) != -1) {
3586 do {
3587 if (HasIndex[Idx]) HasRepeated = true;
3588 HasIndex[Idx] = true;
Chris Lattner88dca042007-08-02 22:33:49 +00003589 compStr++;
John McCall09431682010-11-18 19:01:18 +00003590 } while (*compStr && (Idx = vecType->getPointAccessorIdx(*compStr)) != -1);
3591 } else {
3592 if (HexSwizzle) compStr++;
3593 while ((Idx = vecType->getNumericAccessorIdx(*compStr)) != -1) {
3594 if (HasIndex[Idx]) HasRepeated = true;
3595 HasIndex[Idx] = true;
Chris Lattner88dca042007-08-02 22:33:49 +00003596 compStr++;
John McCall09431682010-11-18 19:01:18 +00003597 }
Chris Lattner88dca042007-08-02 22:33:49 +00003598 }
Nate Begeman353417a2009-01-18 01:47:54 +00003599
Mike Stumpeed9cac2009-02-19 03:04:26 +00003600 if (!HalvingSwizzle && *compStr) {
Steve Naroffe1b31fe2007-07-27 22:15:19 +00003601 // We didn't get to the end of the string. This means the component names
3602 // didn't come from the same set *or* we encountered an illegal name.
John McCall09431682010-11-18 19:01:18 +00003603 S.Diag(OpLoc, diag::err_ext_vector_component_name_illegal)
Benjamin Kramer476d8b82010-08-11 14:47:12 +00003604 << llvm::StringRef(compStr, 1) << SourceRange(CompLoc);
Steve Naroffe1b31fe2007-07-27 22:15:19 +00003605 return QualType();
3606 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00003607
Nate Begeman353417a2009-01-18 01:47:54 +00003608 // Ensure no component accessor exceeds the width of the vector type it
3609 // operates on.
3610 if (!HalvingSwizzle) {
Daniel Dunbare013d682009-10-18 20:26:12 +00003611 compStr = CompName->getNameStart();
Nate Begeman353417a2009-01-18 01:47:54 +00003612
3613 if (HexSwizzle)
Steve Naroffe1b31fe2007-07-27 22:15:19 +00003614 compStr++;
Nate Begeman353417a2009-01-18 01:47:54 +00003615
3616 while (*compStr) {
3617 if (!vecType->isAccessorWithinNumElements(*compStr++)) {
John McCall09431682010-11-18 19:01:18 +00003618 S.Diag(OpLoc, diag::err_ext_vector_component_exceeds_length)
Nate Begeman353417a2009-01-18 01:47:54 +00003619 << baseType << SourceRange(CompLoc);
3620 return QualType();
3621 }
3622 }
Steve Naroffe1b31fe2007-07-27 22:15:19 +00003623 }
Nate Begeman8a997642008-05-09 06:41:27 +00003624
Steve Naroffe1b31fe2007-07-27 22:15:19 +00003625 // The component accessor looks fine - now we need to compute the actual type.
Mike Stumpeed9cac2009-02-19 03:04:26 +00003626 // The vector type is implied by the component accessor. For example,
Steve Naroffe1b31fe2007-07-27 22:15:19 +00003627 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc.
Nate Begeman353417a2009-01-18 01:47:54 +00003628 // vec4.s0 is a float, vec4.s23 is a vec3, etc.
Nate Begeman8a997642008-05-09 06:41:27 +00003629 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2.
Nate Begeman0479a0b2009-12-15 18:13:04 +00003630 unsigned CompSize = HalvingSwizzle ? (vecType->getNumElements() + 1) / 2
Anders Carlsson8f28f992009-08-26 18:25:21 +00003631 : CompName->getLength();
Nate Begeman353417a2009-01-18 01:47:54 +00003632 if (HexSwizzle)
3633 CompSize--;
3634
Steve Naroffe1b31fe2007-07-27 22:15:19 +00003635 if (CompSize == 1)
3636 return vecType->getElementType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00003637
John McCall09431682010-11-18 19:01:18 +00003638 if (HasRepeated) VK = VK_RValue;
3639
3640 QualType VT = S.Context.getExtVectorType(vecType->getElementType(), CompSize);
Mike Stumpeed9cac2009-02-19 03:04:26 +00003641 // Now look up the TypeDefDecl from the vector type. Without this,
Nate Begeman213541a2008-04-18 23:10:10 +00003642 // diagostics look bad. We want extended vector types to appear built-in.
John McCall09431682010-11-18 19:01:18 +00003643 for (unsigned i = 0, E = S.ExtVectorDecls.size(); i != E; ++i) {
3644 if (S.ExtVectorDecls[i]->getUnderlyingType() == VT)
3645 return S.Context.getTypedefType(S.ExtVectorDecls[i]);
Steve Naroffbea0b342007-07-29 16:33:31 +00003646 }
3647 return VT; // should never get here (a typedef type should always be found).
Steve Naroffe1b31fe2007-07-27 22:15:19 +00003648}
3649
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00003650static Decl *FindGetterSetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl,
Anders Carlsson8f28f992009-08-26 18:25:21 +00003651 IdentifierInfo *Member,
Douglas Gregor6ab35242009-04-09 21:40:53 +00003652 const Selector &Sel,
3653 ASTContext &Context) {
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00003654 if (Member)
3655 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Member))
3656 return PD;
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00003657 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel))
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00003658 return OMD;
Mike Stump1eb44332009-09-09 15:08:12 +00003659
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00003660 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(),
3661 E = PDecl->protocol_end(); I != E; ++I) {
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00003662 if (Decl *D = FindGetterSetterNameDeclFromProtocolList(*I, Member, Sel,
3663 Context))
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00003664 return D;
3665 }
3666 return 0;
3667}
3668
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00003669static Decl *FindGetterSetterNameDecl(const ObjCObjectPointerType *QIdTy,
3670 IdentifierInfo *Member,
3671 const Selector &Sel,
3672 ASTContext &Context) {
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00003673 // Check protocols on qualified interfaces.
3674 Decl *GDecl = 0;
Steve Naroffd1b3c2d2009-06-17 22:40:22 +00003675 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(),
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00003676 E = QIdTy->qual_end(); I != E; ++I) {
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00003677 if (Member)
3678 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) {
3679 GDecl = PD;
3680 break;
3681 }
3682 // Also must look for a getter or setter name which uses property syntax.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00003683 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) {
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00003684 GDecl = OMD;
3685 break;
3686 }
3687 }
3688 if (!GDecl) {
Steve Naroffd1b3c2d2009-06-17 22:40:22 +00003689 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(),
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00003690 E = QIdTy->qual_end(); I != E; ++I) {
3691 // Search in the protocol-qualifier list of current protocol.
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00003692 GDecl = FindGetterSetterNameDeclFromProtocolList(*I, Member, Sel,
3693 Context);
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00003694 if (GDecl)
3695 return GDecl;
3696 }
3697 }
3698 return GDecl;
3699}
Chris Lattner76a642f2009-02-15 22:43:40 +00003700
John McCall60d7b3a2010-08-24 06:29:42 +00003701ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003702Sema::ActOnDependentMemberExpr(Expr *BaseExpr, QualType BaseType,
John McCallaa81e162009-12-01 22:10:20 +00003703 bool IsArrow, SourceLocation OpLoc,
John McCall129e2df2009-11-30 22:42:35 +00003704 const CXXScopeSpec &SS,
3705 NamedDecl *FirstQualifierInScope,
Abramo Bagnara25777432010-08-11 22:01:17 +00003706 const DeclarationNameInfo &NameInfo,
John McCall129e2df2009-11-30 22:42:35 +00003707 const TemplateArgumentListInfo *TemplateArgs) {
John McCall129e2df2009-11-30 22:42:35 +00003708 // Even in dependent contexts, try to diagnose base expressions with
3709 // obviously wrong types, e.g.:
3710 //
3711 // T* t;
3712 // t.f;
3713 //
3714 // In Obj-C++, however, the above expression is valid, since it could be
3715 // accessing the 'f' property if T is an Obj-C interface. The extra check
3716 // allows this, while still reporting an error if T is a struct pointer.
3717 if (!IsArrow) {
John McCallaa81e162009-12-01 22:10:20 +00003718 const PointerType *PT = BaseType->getAs<PointerType>();
John McCall129e2df2009-11-30 22:42:35 +00003719 if (PT && (!getLangOptions().ObjC1 ||
3720 PT->getPointeeType()->isRecordType())) {
John McCallaa81e162009-12-01 22:10:20 +00003721 assert(BaseExpr && "cannot happen with implicit member accesses");
Abramo Bagnara25777432010-08-11 22:01:17 +00003722 Diag(NameInfo.getLoc(), diag::err_typecheck_member_reference_struct_union)
John McCallaa81e162009-12-01 22:10:20 +00003723 << BaseType << BaseExpr->getSourceRange();
John McCall129e2df2009-11-30 22:42:35 +00003724 return ExprError();
3725 }
3726 }
3727
Abramo Bagnara25777432010-08-11 22:01:17 +00003728 assert(BaseType->isDependentType() ||
3729 NameInfo.getName().isDependentName() ||
Douglas Gregor01e56ae2010-04-12 20:54:26 +00003730 isDependentScopeSpecifier(SS));
John McCall129e2df2009-11-30 22:42:35 +00003731
3732 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr
3733 // must have pointer type, and the accessed type is the pointee.
John McCallaa81e162009-12-01 22:10:20 +00003734 return Owned(CXXDependentScopeMemberExpr::Create(Context, BaseExpr, BaseType,
John McCall129e2df2009-11-30 22:42:35 +00003735 IsArrow, OpLoc,
Douglas Gregor7c3179c2011-02-28 18:50:33 +00003736 SS.getWithLocInContext(Context),
John McCall129e2df2009-11-30 22:42:35 +00003737 FirstQualifierInScope,
Abramo Bagnara25777432010-08-11 22:01:17 +00003738 NameInfo, TemplateArgs));
John McCall129e2df2009-11-30 22:42:35 +00003739}
3740
3741/// We know that the given qualified member reference points only to
3742/// declarations which do not belong to the static type of the base
3743/// expression. Diagnose the problem.
3744static void DiagnoseQualifiedMemberReference(Sema &SemaRef,
3745 Expr *BaseExpr,
3746 QualType BaseType,
John McCall2f841ba2009-12-02 03:53:29 +00003747 const CXXScopeSpec &SS,
John McCall5808ce42011-02-03 08:15:49 +00003748 NamedDecl *rep,
3749 const DeclarationNameInfo &nameInfo) {
John McCall2f841ba2009-12-02 03:53:29 +00003750 // If this is an implicit member access, use a different set of
3751 // diagnostics.
3752 if (!BaseExpr)
John McCall5808ce42011-02-03 08:15:49 +00003753 return DiagnoseInstanceReference(SemaRef, SS, rep, nameInfo);
John McCall129e2df2009-11-30 22:42:35 +00003754
John McCall5808ce42011-02-03 08:15:49 +00003755 SemaRef.Diag(nameInfo.getLoc(), diag::err_qualified_member_of_unrelated)
3756 << SS.getRange() << rep << BaseType;
John McCall129e2df2009-11-30 22:42:35 +00003757}
3758
3759// Check whether the declarations we found through a nested-name
3760// specifier in a member expression are actually members of the base
3761// type. The restriction here is:
3762//
3763// C++ [expr.ref]p2:
3764// ... In these cases, the id-expression shall name a
3765// member of the class or of one of its base classes.
3766//
3767// So it's perfectly legitimate for the nested-name specifier to name
3768// an unrelated class, and for us to find an overload set including
3769// decls from classes which are not superclasses, as long as the decl
3770// we actually pick through overload resolution is from a superclass.
3771bool Sema::CheckQualifiedMemberReference(Expr *BaseExpr,
3772 QualType BaseType,
John McCall2f841ba2009-12-02 03:53:29 +00003773 const CXXScopeSpec &SS,
John McCall129e2df2009-11-30 22:42:35 +00003774 const LookupResult &R) {
John McCallaa81e162009-12-01 22:10:20 +00003775 const RecordType *BaseRT = BaseType->getAs<RecordType>();
3776 if (!BaseRT) {
3777 // We can't check this yet because the base type is still
3778 // dependent.
3779 assert(BaseType->isDependentType());
3780 return false;
3781 }
3782 CXXRecordDecl *BaseRecord = cast<CXXRecordDecl>(BaseRT->getDecl());
John McCall129e2df2009-11-30 22:42:35 +00003783
3784 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
John McCallaa81e162009-12-01 22:10:20 +00003785 // If this is an implicit member reference and we find a
3786 // non-instance member, it's not an error.
John McCall161755a2010-04-06 21:38:20 +00003787 if (!BaseExpr && !(*I)->isCXXInstanceMember())
John McCallaa81e162009-12-01 22:10:20 +00003788 return false;
John McCall129e2df2009-11-30 22:42:35 +00003789
John McCallaa81e162009-12-01 22:10:20 +00003790 // Note that we use the DC of the decl, not the underlying decl.
Eli Friedman02463762010-07-27 20:51:02 +00003791 DeclContext *DC = (*I)->getDeclContext();
3792 while (DC->isTransparentContext())
3793 DC = DC->getParent();
John McCallaa81e162009-12-01 22:10:20 +00003794
Douglas Gregor9d4bb942010-07-28 22:27:52 +00003795 if (!DC->isRecord())
3796 continue;
3797
John McCallaa81e162009-12-01 22:10:20 +00003798 llvm::SmallPtrSet<CXXRecordDecl*,4> MemberRecord;
Eli Friedman02463762010-07-27 20:51:02 +00003799 MemberRecord.insert(cast<CXXRecordDecl>(DC)->getCanonicalDecl());
John McCallaa81e162009-12-01 22:10:20 +00003800
3801 if (!IsProvablyNotDerivedFrom(*this, BaseRecord, MemberRecord))
3802 return false;
3803 }
3804
John McCall5808ce42011-02-03 08:15:49 +00003805 DiagnoseQualifiedMemberReference(*this, BaseExpr, BaseType, SS,
3806 R.getRepresentativeDecl(),
3807 R.getLookupNameInfo());
John McCallaa81e162009-12-01 22:10:20 +00003808 return true;
3809}
3810
3811static bool
3812LookupMemberExprInRecord(Sema &SemaRef, LookupResult &R,
3813 SourceRange BaseRange, const RecordType *RTy,
John McCallad00b772010-06-16 08:42:20 +00003814 SourceLocation OpLoc, CXXScopeSpec &SS,
3815 bool HasTemplateArgs) {
John McCallaa81e162009-12-01 22:10:20 +00003816 RecordDecl *RDecl = RTy->getDecl();
3817 if (SemaRef.RequireCompleteType(OpLoc, QualType(RTy, 0),
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00003818 SemaRef.PDiag(diag::err_typecheck_incomplete_tag)
John McCallaa81e162009-12-01 22:10:20 +00003819 << BaseRange))
3820 return true;
3821
John McCallad00b772010-06-16 08:42:20 +00003822 if (HasTemplateArgs) {
3823 // LookupTemplateName doesn't expect these both to exist simultaneously.
3824 QualType ObjectType = SS.isSet() ? QualType() : QualType(RTy, 0);
3825
3826 bool MOUS;
3827 SemaRef.LookupTemplateName(R, 0, SS, ObjectType, false, MOUS);
3828 return false;
3829 }
3830
John McCallaa81e162009-12-01 22:10:20 +00003831 DeclContext *DC = RDecl;
3832 if (SS.isSet()) {
3833 // If the member name was a qualified-id, look into the
3834 // nested-name-specifier.
3835 DC = SemaRef.computeDeclContext(SS, false);
3836
John McCall77bb1aa2010-05-01 00:40:08 +00003837 if (SemaRef.RequireCompleteDeclContext(SS, DC)) {
John McCall2f841ba2009-12-02 03:53:29 +00003838 SemaRef.Diag(SS.getRange().getEnd(), diag::err_typecheck_incomplete_tag)
3839 << SS.getRange() << DC;
3840 return true;
3841 }
3842
John McCallaa81e162009-12-01 22:10:20 +00003843 assert(DC && "Cannot handle non-computable dependent contexts in lookup");
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003844
John McCallaa81e162009-12-01 22:10:20 +00003845 if (!isa<TypeDecl>(DC)) {
3846 SemaRef.Diag(R.getNameLoc(), diag::err_qualified_member_nonclass)
3847 << DC << SS.getRange();
3848 return true;
John McCall129e2df2009-11-30 22:42:35 +00003849 }
3850 }
3851
John McCallaa81e162009-12-01 22:10:20 +00003852 // The record definition is complete, now look up the member.
3853 SemaRef.LookupQualifiedName(R, DC);
John McCall129e2df2009-11-30 22:42:35 +00003854
Douglas Gregor2dcc0112009-12-31 07:42:17 +00003855 if (!R.empty())
3856 return false;
3857
3858 // We didn't find anything with the given name, so try to correct
3859 // for typos.
3860 DeclarationName Name = R.getLookupName();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00003861 if (SemaRef.CorrectTypo(R, 0, &SS, DC, false, Sema::CTC_MemberLookup) &&
Douglas Gregoraaf87162010-04-14 20:04:41 +00003862 !R.empty() &&
Douglas Gregor2dcc0112009-12-31 07:42:17 +00003863 (isa<ValueDecl>(*R.begin()) || isa<FunctionTemplateDecl>(*R.begin()))) {
3864 SemaRef.Diag(R.getNameLoc(), diag::err_no_member_suggest)
3865 << Name << DC << R.getLookupName() << SS.getRange()
Douglas Gregor849b2432010-03-31 17:46:05 +00003866 << FixItHint::CreateReplacement(R.getNameLoc(),
3867 R.getLookupName().getAsString());
Douglas Gregor67dd1d42010-01-07 00:17:44 +00003868 if (NamedDecl *ND = R.getAsSingle<NamedDecl>())
3869 SemaRef.Diag(ND->getLocation(), diag::note_previous_decl)
3870 << ND->getDeclName();
Douglas Gregor2dcc0112009-12-31 07:42:17 +00003871 return false;
3872 } else {
3873 R.clear();
Douglas Gregor12eb5d62010-06-29 19:27:42 +00003874 R.setLookupName(Name);
Douglas Gregor2dcc0112009-12-31 07:42:17 +00003875 }
3876
John McCall129e2df2009-11-30 22:42:35 +00003877 return false;
3878}
3879
John McCall60d7b3a2010-08-24 06:29:42 +00003880ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003881Sema::BuildMemberReferenceExpr(Expr *Base, QualType BaseType,
John McCall129e2df2009-11-30 22:42:35 +00003882 SourceLocation OpLoc, bool IsArrow,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00003883 CXXScopeSpec &SS,
John McCall129e2df2009-11-30 22:42:35 +00003884 NamedDecl *FirstQualifierInScope,
Abramo Bagnara25777432010-08-11 22:01:17 +00003885 const DeclarationNameInfo &NameInfo,
John McCall129e2df2009-11-30 22:42:35 +00003886 const TemplateArgumentListInfo *TemplateArgs) {
John McCall2f841ba2009-12-02 03:53:29 +00003887 if (BaseType->isDependentType() ||
3888 (SS.isSet() && isDependentScopeSpecifier(SS)))
John McCall9ae2f072010-08-23 23:25:46 +00003889 return ActOnDependentMemberExpr(Base, BaseType,
John McCall129e2df2009-11-30 22:42:35 +00003890 IsArrow, OpLoc,
3891 SS, FirstQualifierInScope,
Abramo Bagnara25777432010-08-11 22:01:17 +00003892 NameInfo, TemplateArgs);
John McCall129e2df2009-11-30 22:42:35 +00003893
Abramo Bagnara25777432010-08-11 22:01:17 +00003894 LookupResult R(*this, NameInfo, LookupMemberName);
John McCall129e2df2009-11-30 22:42:35 +00003895
John McCallaa81e162009-12-01 22:10:20 +00003896 // Implicit member accesses.
3897 if (!Base) {
3898 QualType RecordTy = BaseType;
3899 if (IsArrow) RecordTy = RecordTy->getAs<PointerType>()->getPointeeType();
3900 if (LookupMemberExprInRecord(*this, R, SourceRange(),
3901 RecordTy->getAs<RecordType>(),
John McCallad00b772010-06-16 08:42:20 +00003902 OpLoc, SS, TemplateArgs != 0))
John McCallaa81e162009-12-01 22:10:20 +00003903 return ExprError();
3904
3905 // Explicit member accesses.
3906 } else {
John Wiegley429bb272011-04-08 18:41:53 +00003907 ExprResult BaseResult = Owned(Base);
John McCall60d7b3a2010-08-24 06:29:42 +00003908 ExprResult Result =
John Wiegley429bb272011-04-08 18:41:53 +00003909 LookupMemberExpr(R, BaseResult, IsArrow, OpLoc,
John McCalld226f652010-08-21 09:40:31 +00003910 SS, /*ObjCImpDecl*/ 0, TemplateArgs != 0);
John McCallaa81e162009-12-01 22:10:20 +00003911
John Wiegley429bb272011-04-08 18:41:53 +00003912 if (BaseResult.isInvalid())
3913 return ExprError();
3914 Base = BaseResult.take();
3915
John McCallaa81e162009-12-01 22:10:20 +00003916 if (Result.isInvalid()) {
3917 Owned(Base);
3918 return ExprError();
3919 }
3920
3921 if (Result.get())
3922 return move(Result);
Sebastian Redlf3e63372010-05-07 09:25:11 +00003923
3924 // LookupMemberExpr can modify Base, and thus change BaseType
3925 BaseType = Base->getType();
John McCall129e2df2009-11-30 22:42:35 +00003926 }
3927
John McCall9ae2f072010-08-23 23:25:46 +00003928 return BuildMemberReferenceExpr(Base, BaseType,
John McCallc2233c52010-01-15 08:34:02 +00003929 OpLoc, IsArrow, SS, FirstQualifierInScope,
3930 R, TemplateArgs);
John McCall129e2df2009-11-30 22:42:35 +00003931}
3932
John McCall60d7b3a2010-08-24 06:29:42 +00003933ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003934Sema::BuildMemberReferenceExpr(Expr *BaseExpr, QualType BaseExprType,
John McCallaa81e162009-12-01 22:10:20 +00003935 SourceLocation OpLoc, bool IsArrow,
3936 const CXXScopeSpec &SS,
John McCallc2233c52010-01-15 08:34:02 +00003937 NamedDecl *FirstQualifierInScope,
John McCall129e2df2009-11-30 22:42:35 +00003938 LookupResult &R,
Douglas Gregor06a9f362010-05-01 20:49:11 +00003939 const TemplateArgumentListInfo *TemplateArgs,
3940 bool SuppressQualifierCheck) {
John McCallaa81e162009-12-01 22:10:20 +00003941 QualType BaseType = BaseExprType;
John McCall129e2df2009-11-30 22:42:35 +00003942 if (IsArrow) {
3943 assert(BaseType->isPointerType());
3944 BaseType = BaseType->getAs<PointerType>()->getPointeeType();
3945 }
John McCall161755a2010-04-06 21:38:20 +00003946 R.setBaseObjectType(BaseType);
John McCall129e2df2009-11-30 22:42:35 +00003947
Abramo Bagnara25777432010-08-11 22:01:17 +00003948 const DeclarationNameInfo &MemberNameInfo = R.getLookupNameInfo();
3949 DeclarationName MemberName = MemberNameInfo.getName();
3950 SourceLocation MemberLoc = MemberNameInfo.getLoc();
John McCall129e2df2009-11-30 22:42:35 +00003951
3952 if (R.isAmbiguous())
Douglas Gregorfe85ced2009-08-06 03:17:00 +00003953 return ExprError();
3954
John McCall129e2df2009-11-30 22:42:35 +00003955 if (R.empty()) {
3956 // Rederive where we looked up.
3957 DeclContext *DC = (SS.isSet()
3958 ? computeDeclContext(SS, false)
3959 : BaseType->getAs<RecordType>()->getDecl());
Nate Begeman2ef13e52009-08-10 23:49:36 +00003960
John McCall129e2df2009-11-30 22:42:35 +00003961 Diag(R.getNameLoc(), diag::err_no_member)
John McCallaa81e162009-12-01 22:10:20 +00003962 << MemberName << DC
3963 << (BaseExpr ? BaseExpr->getSourceRange() : SourceRange());
John McCall129e2df2009-11-30 22:42:35 +00003964 return ExprError();
3965 }
3966
John McCallc2233c52010-01-15 08:34:02 +00003967 // Diagnose lookups that find only declarations from a non-base
3968 // type. This is possible for either qualified lookups (which may
3969 // have been qualified with an unrelated type) or implicit member
3970 // expressions (which were found with unqualified lookup and thus
3971 // may have come from an enclosing scope). Note that it's okay for
3972 // lookup to find declarations from a non-base type as long as those
3973 // aren't the ones picked by overload resolution.
3974 if ((SS.isSet() || !BaseExpr ||
3975 (isa<CXXThisExpr>(BaseExpr) &&
3976 cast<CXXThisExpr>(BaseExpr)->isImplicit())) &&
Douglas Gregor06a9f362010-05-01 20:49:11 +00003977 !SuppressQualifierCheck &&
John McCallc2233c52010-01-15 08:34:02 +00003978 CheckQualifiedMemberReference(BaseExpr, BaseType, SS, R))
John McCall129e2df2009-11-30 22:42:35 +00003979 return ExprError();
3980
3981 // Construct an unresolved result if we in fact got an unresolved
3982 // result.
3983 if (R.isOverloadedResult() || R.isUnresolvableResult()) {
John McCallc373d482010-01-27 01:50:18 +00003984 // Suppress any lookup-related diagnostics; we'll do these when we
3985 // pick a member.
3986 R.suppressDiagnostics();
3987
John McCall129e2df2009-11-30 22:42:35 +00003988 UnresolvedMemberExpr *MemExpr
Douglas Gregorbebbe0d2010-12-15 01:34:56 +00003989 = UnresolvedMemberExpr::Create(Context, R.isUnresolvableResult(),
John McCallaa81e162009-12-01 22:10:20 +00003990 BaseExpr, BaseExprType,
3991 IsArrow, OpLoc,
Douglas Gregor4c9be892011-02-28 20:01:57 +00003992 SS.getWithLocInContext(Context),
Abramo Bagnara25777432010-08-11 22:01:17 +00003993 MemberNameInfo,
Douglas Gregor5a84dec2010-05-23 18:57:34 +00003994 TemplateArgs, R.begin(), R.end());
John McCall129e2df2009-11-30 22:42:35 +00003995
3996 return Owned(MemExpr);
3997 }
3998
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003999 assert(R.isSingleResult());
John McCall161755a2010-04-06 21:38:20 +00004000 DeclAccessPair FoundDecl = R.begin().getPair();
John McCall129e2df2009-11-30 22:42:35 +00004001 NamedDecl *MemberDecl = R.getFoundDecl();
4002
4003 // FIXME: diagnose the presence of template arguments now.
4004
4005 // If the decl being referenced had an error, return an error for this
4006 // sub-expr without emitting another error, in order to avoid cascading
4007 // error cases.
4008 if (MemberDecl->isInvalidDecl())
4009 return ExprError();
4010
John McCallaa81e162009-12-01 22:10:20 +00004011 // Handle the implicit-member-access case.
4012 if (!BaseExpr) {
4013 // If this is not an instance member, convert to a non-member access.
John McCall161755a2010-04-06 21:38:20 +00004014 if (!MemberDecl->isCXXInstanceMember())
Abramo Bagnara25777432010-08-11 22:01:17 +00004015 return BuildDeclarationNameExpr(SS, R.getLookupNameInfo(), MemberDecl);
John McCallaa81e162009-12-01 22:10:20 +00004016
Douglas Gregor828a1972010-01-07 23:12:05 +00004017 SourceLocation Loc = R.getNameLoc();
4018 if (SS.getRange().isValid())
4019 Loc = SS.getRange().getBegin();
4020 BaseExpr = new (Context) CXXThisExpr(Loc, BaseExprType,/*isImplicit=*/true);
John McCallaa81e162009-12-01 22:10:20 +00004021 }
4022
John McCall129e2df2009-11-30 22:42:35 +00004023 bool ShouldCheckUse = true;
4024 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(MemberDecl)) {
4025 // Don't diagnose the use of a virtual member function unless it's
4026 // explicitly qualified.
4027 if (MD->isVirtual() && !SS.isSet())
4028 ShouldCheckUse = false;
4029 }
4030
4031 // Check the use of this member.
4032 if (ShouldCheckUse && DiagnoseUseOfDecl(MemberDecl, MemberLoc)) {
4033 Owned(BaseExpr);
4034 return ExprError();
4035 }
4036
John McCallf6a16482010-12-04 03:47:34 +00004037 // Perform a property load on the base regardless of whether we
4038 // actually need it for the declaration.
John Wiegley429bb272011-04-08 18:41:53 +00004039 if (BaseExpr->getObjectKind() == OK_ObjCProperty) {
4040 ExprResult Result = ConvertPropertyForRValue(BaseExpr);
4041 if (Result.isInvalid())
4042 return ExprError();
4043 BaseExpr = Result.take();
4044 }
John McCallf6a16482010-12-04 03:47:34 +00004045
John McCalldfa1edb2010-11-23 20:48:44 +00004046 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl))
4047 return BuildFieldReferenceExpr(*this, BaseExpr, IsArrow,
4048 SS, FD, FoundDecl, MemberNameInfo);
John McCall129e2df2009-11-30 22:42:35 +00004049
Francois Pichet87c2e122010-11-21 06:08:52 +00004050 if (IndirectFieldDecl *FD = dyn_cast<IndirectFieldDecl>(MemberDecl))
4051 // We may have found a field within an anonymous union or struct
4052 // (C++ [class.union]).
John McCall5808ce42011-02-03 08:15:49 +00004053 return BuildAnonymousStructUnionMemberReference(SS, MemberLoc, FD,
John McCallf6a16482010-12-04 03:47:34 +00004054 BaseExpr, OpLoc);
Francois Pichet87c2e122010-11-21 06:08:52 +00004055
John McCall129e2df2009-11-30 22:42:35 +00004056 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) {
4057 MarkDeclarationReferenced(MemberLoc, Var);
4058 return Owned(BuildMemberExpr(Context, BaseExpr, IsArrow, SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00004059 Var, FoundDecl, MemberNameInfo,
John McCallf89e55a2010-11-18 06:31:45 +00004060 Var->getType().getNonReferenceType(),
John McCall09431682010-11-18 19:01:18 +00004061 VK_LValue, OK_Ordinary));
John McCall129e2df2009-11-30 22:42:35 +00004062 }
4063
John McCallf89e55a2010-11-18 06:31:45 +00004064 if (CXXMethodDecl *MemberFn = dyn_cast<CXXMethodDecl>(MemberDecl)) {
John McCall864c0412011-04-26 20:42:42 +00004065 ExprValueKind valueKind;
4066 QualType type;
4067 if (MemberFn->isInstance()) {
4068 valueKind = VK_RValue;
4069 type = Context.BoundMemberTy;
4070 } else {
4071 valueKind = VK_LValue;
4072 type = MemberFn->getType();
4073 }
4074
John McCall129e2df2009-11-30 22:42:35 +00004075 MarkDeclarationReferenced(MemberLoc, MemberDecl);
4076 return Owned(BuildMemberExpr(Context, BaseExpr, IsArrow, SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00004077 MemberFn, FoundDecl, MemberNameInfo,
John McCall864c0412011-04-26 20:42:42 +00004078 type, valueKind, OK_Ordinary));
John McCall129e2df2009-11-30 22:42:35 +00004079 }
John McCallf89e55a2010-11-18 06:31:45 +00004080 assert(!isa<FunctionDecl>(MemberDecl) && "member function not C++ method?");
John McCall129e2df2009-11-30 22:42:35 +00004081
4082 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) {
4083 MarkDeclarationReferenced(MemberLoc, MemberDecl);
4084 return Owned(BuildMemberExpr(Context, BaseExpr, IsArrow, SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00004085 Enum, FoundDecl, MemberNameInfo,
John McCallf89e55a2010-11-18 06:31:45 +00004086 Enum->getType(), VK_RValue, OK_Ordinary));
John McCall129e2df2009-11-30 22:42:35 +00004087 }
4088
4089 Owned(BaseExpr);
4090
Douglas Gregorb0fd4832010-04-25 20:55:08 +00004091 // We found something that we didn't expect. Complain.
John McCall129e2df2009-11-30 22:42:35 +00004092 if (isa<TypeDecl>(MemberDecl))
Abramo Bagnara25777432010-08-11 22:01:17 +00004093 Diag(MemberLoc, diag::err_typecheck_member_reference_type)
Douglas Gregorb0fd4832010-04-25 20:55:08 +00004094 << MemberName << BaseType << int(IsArrow);
4095 else
4096 Diag(MemberLoc, diag::err_typecheck_member_reference_unknown)
4097 << MemberName << BaseType << int(IsArrow);
John McCall129e2df2009-11-30 22:42:35 +00004098
Douglas Gregorb0fd4832010-04-25 20:55:08 +00004099 Diag(MemberDecl->getLocation(), diag::note_member_declared_here)
4100 << MemberName;
Douglas Gregor2b147f02010-04-25 21:15:30 +00004101 R.suppressDiagnostics();
Douglas Gregorb0fd4832010-04-25 20:55:08 +00004102 return ExprError();
John McCall129e2df2009-11-30 22:42:35 +00004103}
4104
John McCall028d3972010-12-15 16:46:44 +00004105/// Given that normal member access failed on the given expression,
4106/// and given that the expression's type involves builtin-id or
4107/// builtin-Class, decide whether substituting in the redefinition
4108/// types would be profitable. The redefinition type is whatever
4109/// this translation unit tried to typedef to id/Class; we store
4110/// it to the side and then re-use it in places like this.
John Wiegley429bb272011-04-08 18:41:53 +00004111static bool ShouldTryAgainWithRedefinitionType(Sema &S, ExprResult &base) {
John McCall028d3972010-12-15 16:46:44 +00004112 const ObjCObjectPointerType *opty
John Wiegley429bb272011-04-08 18:41:53 +00004113 = base.get()->getType()->getAs<ObjCObjectPointerType>();
John McCall028d3972010-12-15 16:46:44 +00004114 if (!opty) return false;
4115
4116 const ObjCObjectType *ty = opty->getObjectType();
4117
4118 QualType redef;
4119 if (ty->isObjCId()) {
4120 redef = S.Context.ObjCIdRedefinitionType;
4121 } else if (ty->isObjCClass()) {
4122 redef = S.Context.ObjCClassRedefinitionType;
4123 } else {
4124 return false;
4125 }
4126
4127 // Do the substitution as long as the redefinition type isn't just a
4128 // possibly-qualified pointer to builtin-id or builtin-Class again.
4129 opty = redef->getAs<ObjCObjectPointerType>();
4130 if (opty && !opty->getObjectType()->getInterface() != 0)
4131 return false;
4132
John Wiegley429bb272011-04-08 18:41:53 +00004133 base = S.ImpCastExprToType(base.take(), redef, CK_BitCast);
John McCall028d3972010-12-15 16:46:44 +00004134 return true;
4135}
4136
John McCall129e2df2009-11-30 22:42:35 +00004137/// Look up the given member of the given non-type-dependent
4138/// expression. This can return in one of two ways:
4139/// * If it returns a sentinel null-but-valid result, the caller will
4140/// assume that lookup was performed and the results written into
4141/// the provided structure. It will take over from there.
4142/// * Otherwise, the returned expression will be produced in place of
4143/// an ordinary member expression.
4144///
4145/// The ObjCImpDecl bit is a gross hack that will need to be properly
4146/// fixed for ObjC++.
John McCall60d7b3a2010-08-24 06:29:42 +00004147ExprResult
John Wiegley429bb272011-04-08 18:41:53 +00004148Sema::LookupMemberExpr(LookupResult &R, ExprResult &BaseExpr,
John McCall812c1542009-12-07 22:46:59 +00004149 bool &IsArrow, SourceLocation OpLoc,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00004150 CXXScopeSpec &SS,
John McCalld226f652010-08-21 09:40:31 +00004151 Decl *ObjCImpDecl, bool HasTemplateArgs) {
John Wiegley429bb272011-04-08 18:41:53 +00004152 assert(BaseExpr.get() && "no base expression");
Mike Stump1eb44332009-09-09 15:08:12 +00004153
Steve Naroff3cc4af82007-12-16 21:42:28 +00004154 // Perform default conversions.
John Wiegley429bb272011-04-08 18:41:53 +00004155 BaseExpr = DefaultFunctionArrayConversion(BaseExpr.take());
Sebastian Redl0eb23302009-01-19 00:08:26 +00004156
John Wiegley429bb272011-04-08 18:41:53 +00004157 if (IsArrow) {
4158 BaseExpr = DefaultLvalueConversion(BaseExpr.take());
4159 if (BaseExpr.isInvalid())
4160 return ExprError();
4161 }
4162
4163 QualType BaseType = BaseExpr.get()->getType();
John McCall129e2df2009-11-30 22:42:35 +00004164 assert(!BaseType->isDependentType());
4165
4166 DeclarationName MemberName = R.getLookupName();
4167 SourceLocation MemberLoc = R.getNameLoc();
Douglas Gregor3f0b5fd2009-11-06 06:30:47 +00004168
John McCall028d3972010-12-15 16:46:44 +00004169 // For later type-checking purposes, turn arrow accesses into dot
4170 // accesses. The only access type we support that doesn't follow
4171 // the C equivalence "a->b === (*a).b" is ObjC property accesses,
4172 // and those never use arrows, so this is unaffected.
4173 if (IsArrow) {
4174 if (const PointerType *Ptr = BaseType->getAs<PointerType>())
4175 BaseType = Ptr->getPointeeType();
4176 else if (const ObjCObjectPointerType *Ptr
4177 = BaseType->getAs<ObjCObjectPointerType>())
4178 BaseType = Ptr->getPointeeType();
4179 else if (BaseType->isRecordType()) {
4180 // Recover from arrow accesses to records, e.g.:
4181 // struct MyRecord foo;
4182 // foo->bar
4183 // This is actually well-formed in C++ if MyRecord has an
4184 // overloaded operator->, but that should have been dealt with
4185 // by now.
4186 Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
John Wiegley429bb272011-04-08 18:41:53 +00004187 << BaseType << int(IsArrow) << BaseExpr.get()->getSourceRange()
John McCall028d3972010-12-15 16:46:44 +00004188 << FixItHint::CreateReplacement(OpLoc, ".");
4189 IsArrow = false;
John McCall864c0412011-04-26 20:42:42 +00004190 } else if (BaseType == Context.BoundMemberTy) {
4191 goto fail;
John McCall028d3972010-12-15 16:46:44 +00004192 } else {
4193 Diag(MemberLoc, diag::err_typecheck_member_reference_arrow)
John Wiegley429bb272011-04-08 18:41:53 +00004194 << BaseType << BaseExpr.get()->getSourceRange();
John McCall028d3972010-12-15 16:46:44 +00004195 return ExprError();
Douglas Gregor3f0b5fd2009-11-06 06:30:47 +00004196 }
4197 }
4198
John McCall028d3972010-12-15 16:46:44 +00004199 // Handle field access to simple records.
4200 if (const RecordType *RTy = BaseType->getAs<RecordType>()) {
John Wiegley429bb272011-04-08 18:41:53 +00004201 if (LookupMemberExprInRecord(*this, R, BaseExpr.get()->getSourceRange(),
John McCall028d3972010-12-15 16:46:44 +00004202 RTy, OpLoc, SS, HasTemplateArgs))
4203 return ExprError();
4204
4205 // Returning valid-but-null is how we indicate to the caller that
4206 // the lookup result was filled in.
4207 return Owned((Expr*) 0);
David Chisnall0f436562009-08-17 16:35:33 +00004208 }
John McCall129e2df2009-11-30 22:42:35 +00004209
John McCall028d3972010-12-15 16:46:44 +00004210 // Handle ivar access to Objective-C objects.
4211 if (const ObjCObjectType *OTy = BaseType->getAs<ObjCObjectType>()) {
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004212 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
John McCall028d3972010-12-15 16:46:44 +00004213
4214 // There are three cases for the base type:
4215 // - builtin id (qualified or unqualified)
4216 // - builtin Class (qualified or unqualified)
4217 // - an interface
4218 ObjCInterfaceDecl *IDecl = OTy->getInterface();
4219 if (!IDecl) {
4220 // There's an implicit 'isa' ivar on all objects.
4221 // But we only actually find it this way on objects of type 'id',
4222 // apparently.
4223 if (OTy->isObjCId() && Member->isStr("isa"))
John Wiegley429bb272011-04-08 18:41:53 +00004224 return Owned(new (Context) ObjCIsaExpr(BaseExpr.take(), IsArrow, MemberLoc,
John McCall028d3972010-12-15 16:46:44 +00004225 Context.getObjCClassType()));
4226
4227 if (ShouldTryAgainWithRedefinitionType(*this, BaseExpr))
4228 return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS,
4229 ObjCImpDecl, HasTemplateArgs);
4230 goto fail;
4231 }
4232
4233 ObjCInterfaceDecl *ClassDeclared;
4234 ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared);
4235
4236 if (!IV) {
4237 // Attempt to correct for typos in ivar names.
4238 LookupResult Res(*this, R.getLookupName(), R.getNameLoc(),
4239 LookupMemberName);
4240 if (CorrectTypo(Res, 0, 0, IDecl, false,
4241 IsArrow ? CTC_ObjCIvarLookup
4242 : CTC_ObjCPropertyLookup) &&
4243 (IV = Res.getAsSingle<ObjCIvarDecl>())) {
4244 Diag(R.getNameLoc(),
4245 diag::err_typecheck_member_reference_ivar_suggest)
4246 << IDecl->getDeclName() << MemberName << IV->getDeclName()
4247 << FixItHint::CreateReplacement(R.getNameLoc(),
4248 IV->getNameAsString());
4249 Diag(IV->getLocation(), diag::note_previous_decl)
4250 << IV->getDeclName();
4251 } else {
4252 Res.clear();
4253 Res.setLookupName(Member);
4254
4255 Diag(MemberLoc, diag::err_typecheck_member_reference_ivar)
4256 << IDecl->getDeclName() << MemberName
John Wiegley429bb272011-04-08 18:41:53 +00004257 << BaseExpr.get()->getSourceRange();
John McCall028d3972010-12-15 16:46:44 +00004258 return ExprError();
4259 }
4260 }
4261
4262 // If the decl being referenced had an error, return an error for this
4263 // sub-expr without emitting another error, in order to avoid cascading
4264 // error cases.
4265 if (IV->isInvalidDecl())
4266 return ExprError();
4267
4268 // Check whether we can reference this field.
4269 if (DiagnoseUseOfDecl(IV, MemberLoc))
4270 return ExprError();
4271 if (IV->getAccessControl() != ObjCIvarDecl::Public &&
4272 IV->getAccessControl() != ObjCIvarDecl::Package) {
4273 ObjCInterfaceDecl *ClassOfMethodDecl = 0;
4274 if (ObjCMethodDecl *MD = getCurMethodDecl())
4275 ClassOfMethodDecl = MD->getClassInterface();
4276 else if (ObjCImpDecl && getCurFunctionDecl()) {
4277 // Case of a c-function declared inside an objc implementation.
4278 // FIXME: For a c-style function nested inside an objc implementation
4279 // class, there is no implementation context available, so we pass
4280 // down the context as argument to this routine. Ideally, this context
4281 // need be passed down in the AST node and somehow calculated from the
4282 // AST for a function decl.
4283 if (ObjCImplementationDecl *IMPD =
4284 dyn_cast<ObjCImplementationDecl>(ObjCImpDecl))
4285 ClassOfMethodDecl = IMPD->getClassInterface();
4286 else if (ObjCCategoryImplDecl* CatImplClass =
4287 dyn_cast<ObjCCategoryImplDecl>(ObjCImpDecl))
4288 ClassOfMethodDecl = CatImplClass->getClassInterface();
4289 }
4290
4291 if (IV->getAccessControl() == ObjCIvarDecl::Private) {
4292 if (ClassDeclared != IDecl ||
4293 ClassOfMethodDecl != ClassDeclared)
4294 Diag(MemberLoc, diag::error_private_ivar_access)
4295 << IV->getDeclName();
4296 } else if (!IDecl->isSuperClassOf(ClassOfMethodDecl))
4297 // @protected
4298 Diag(MemberLoc, diag::error_protected_ivar_access)
4299 << IV->getDeclName();
4300 }
4301
4302 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(),
John Wiegley429bb272011-04-08 18:41:53 +00004303 MemberLoc, BaseExpr.take(),
John McCall028d3972010-12-15 16:46:44 +00004304 IsArrow));
4305 }
4306
4307 // Objective-C property access.
4308 const ObjCObjectPointerType *OPT;
4309 if (!IsArrow && (OPT = BaseType->getAs<ObjCObjectPointerType>())) {
4310 // This actually uses the base as an r-value.
John Wiegley429bb272011-04-08 18:41:53 +00004311 BaseExpr = DefaultLvalueConversion(BaseExpr.take());
4312 if (BaseExpr.isInvalid())
4313 return ExprError();
4314
4315 assert(Context.hasSameUnqualifiedType(BaseType, BaseExpr.get()->getType()));
John McCall028d3972010-12-15 16:46:44 +00004316
4317 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
4318
4319 const ObjCObjectType *OT = OPT->getObjectType();
4320
4321 // id, with and without qualifiers.
4322 if (OT->isObjCId()) {
4323 // Check protocols on qualified interfaces.
4324 Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
4325 if (Decl *PMDecl = FindGetterSetterNameDecl(OPT, Member, Sel, Context)) {
4326 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) {
4327 // Check the use of this declaration
4328 if (DiagnoseUseOfDecl(PD, MemberLoc))
4329 return ExprError();
4330
4331 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(),
4332 VK_LValue,
4333 OK_ObjCProperty,
4334 MemberLoc,
John Wiegley429bb272011-04-08 18:41:53 +00004335 BaseExpr.take()));
John McCall028d3972010-12-15 16:46:44 +00004336 }
4337
4338 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) {
4339 // Check the use of this method.
4340 if (DiagnoseUseOfDecl(OMD, MemberLoc))
4341 return ExprError();
4342 Selector SetterSel =
4343 SelectorTable::constructSetterName(PP.getIdentifierTable(),
4344 PP.getSelectorTable(), Member);
4345 ObjCMethodDecl *SMD = 0;
4346 if (Decl *SDecl = FindGetterSetterNameDecl(OPT, /*Property id*/0,
4347 SetterSel, Context))
4348 SMD = dyn_cast<ObjCMethodDecl>(SDecl);
4349 QualType PType = OMD->getSendResultType();
4350
4351 ExprValueKind VK = VK_LValue;
4352 if (!getLangOptions().CPlusPlus &&
4353 IsCForbiddenLValueType(Context, PType))
4354 VK = VK_RValue;
4355 ExprObjectKind OK = (VK == VK_RValue ? OK_Ordinary : OK_ObjCProperty);
4356
4357 return Owned(new (Context) ObjCPropertyRefExpr(OMD, SMD, PType,
4358 VK, OK,
John Wiegley429bb272011-04-08 18:41:53 +00004359 MemberLoc, BaseExpr.take()));
John McCall028d3972010-12-15 16:46:44 +00004360 }
4361 }
Fariborz Jahanian4eb7f692011-03-15 17:27:48 +00004362 // Use of id.member can only be for a property reference. Do not
4363 // use the 'id' redefinition in this case.
4364 if (IsArrow && ShouldTryAgainWithRedefinitionType(*this, BaseExpr))
John McCall028d3972010-12-15 16:46:44 +00004365 return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS,
4366 ObjCImpDecl, HasTemplateArgs);
4367
4368 return ExprError(Diag(MemberLoc, diag::err_property_not_found)
4369 << MemberName << BaseType);
4370 }
4371
4372 // 'Class', unqualified only.
4373 if (OT->isObjCClass()) {
4374 // Only works in a method declaration (??!).
4375 ObjCMethodDecl *MD = getCurMethodDecl();
4376 if (!MD) {
4377 if (ShouldTryAgainWithRedefinitionType(*this, BaseExpr))
4378 return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS,
4379 ObjCImpDecl, HasTemplateArgs);
4380
4381 goto fail;
4382 }
4383
4384 // Also must look for a getter name which uses property syntax.
4385 Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004386 ObjCInterfaceDecl *IFace = MD->getClassInterface();
4387 ObjCMethodDecl *Getter;
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004388 if ((Getter = IFace->lookupClassMethod(Sel))) {
4389 // Check the use of this method.
4390 if (DiagnoseUseOfDecl(Getter, MemberLoc))
4391 return ExprError();
John McCall028d3972010-12-15 16:46:44 +00004392 } else
Fariborz Jahanian74b27562010-12-03 23:37:08 +00004393 Getter = IFace->lookupPrivateMethod(Sel, false);
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004394 // If we found a getter then this may be a valid dot-reference, we
4395 // will look for the matching setter, in case it is needed.
4396 Selector SetterSel =
John McCall028d3972010-12-15 16:46:44 +00004397 SelectorTable::constructSetterName(PP.getIdentifierTable(),
4398 PP.getSelectorTable(), Member);
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004399 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
4400 if (!Setter) {
4401 // If this reference is in an @implementation, also check for 'private'
4402 // methods.
Fariborz Jahanian74b27562010-12-03 23:37:08 +00004403 Setter = IFace->lookupPrivateMethod(SetterSel, false);
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004404 }
4405 // Look through local category implementations associated with the class.
4406 if (!Setter)
4407 Setter = IFace->getCategoryClassMethod(SetterSel);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004408
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004409 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
4410 return ExprError();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004411
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004412 if (Getter || Setter) {
4413 QualType PType;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004414
John McCall09431682010-11-18 19:01:18 +00004415 ExprValueKind VK = VK_LValue;
4416 if (Getter) {
Douglas Gregor5291c3c2010-07-13 08:18:22 +00004417 PType = Getter->getSendResultType();
John McCall09431682010-11-18 19:01:18 +00004418 if (!getLangOptions().CPlusPlus &&
4419 IsCForbiddenLValueType(Context, PType))
4420 VK = VK_RValue;
4421 } else {
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004422 // Get the expression type from Setter's incoming parameter.
4423 PType = (*(Setter->param_end() -1))->getType();
John McCall09431682010-11-18 19:01:18 +00004424 }
4425 ExprObjectKind OK = (VK == VK_RValue ? OK_Ordinary : OK_ObjCProperty);
4426
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004427 // FIXME: we must check that the setter has property type.
John McCall12f78a62010-12-02 01:19:52 +00004428 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter,
4429 PType, VK, OK,
John Wiegley429bb272011-04-08 18:41:53 +00004430 MemberLoc, BaseExpr.take()));
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004431 }
John McCall028d3972010-12-15 16:46:44 +00004432
4433 if (ShouldTryAgainWithRedefinitionType(*this, BaseExpr))
4434 return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS,
4435 ObjCImpDecl, HasTemplateArgs);
4436
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00004437 return ExprError(Diag(MemberLoc, diag::err_property_not_found)
John McCall028d3972010-12-15 16:46:44 +00004438 << MemberName << BaseType);
Steve Naroff14108da2009-07-10 23:34:53 +00004439 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00004440
John McCall028d3972010-12-15 16:46:44 +00004441 // Normal property access.
John Wiegley429bb272011-04-08 18:41:53 +00004442 return HandleExprPropertyRefExpr(OPT, BaseExpr.get(), MemberName, MemberLoc,
John McCall028d3972010-12-15 16:46:44 +00004443 SourceLocation(), QualType(), false);
Steve Naroff14108da2009-07-10 23:34:53 +00004444 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00004445
Chris Lattnerfb173ec2008-07-21 04:28:12 +00004446 // Handle 'field access' to vectors, such as 'V.xx'.
Chris Lattner73525de2009-02-16 21:11:58 +00004447 if (BaseType->isExtVectorType()) {
John McCall5e3c67b2010-12-15 04:42:30 +00004448 // FIXME: this expr should store IsArrow.
Anders Carlsson8f28f992009-08-26 18:25:21 +00004449 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
John Wiegley429bb272011-04-08 18:41:53 +00004450 ExprValueKind VK = (IsArrow ? VK_LValue : BaseExpr.get()->getValueKind());
John McCall09431682010-11-18 19:01:18 +00004451 QualType ret = CheckExtVectorComponent(*this, BaseType, VK, OpLoc,
4452 Member, MemberLoc);
Chris Lattnerfb173ec2008-07-21 04:28:12 +00004453 if (ret.isNull())
Sebastian Redl0eb23302009-01-19 00:08:26 +00004454 return ExprError();
John McCall09431682010-11-18 19:01:18 +00004455
John Wiegley429bb272011-04-08 18:41:53 +00004456 return Owned(new (Context) ExtVectorElementExpr(ret, VK, BaseExpr.take(),
John McCall09431682010-11-18 19:01:18 +00004457 *Member, MemberLoc));
Chris Lattnerfb173ec2008-07-21 04:28:12 +00004458 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004459
John McCall028d3972010-12-15 16:46:44 +00004460 // Adjust builtin-sel to the appropriate redefinition type if that's
4461 // not just a pointer to builtin-sel again.
4462 if (IsArrow &&
4463 BaseType->isSpecificBuiltinType(BuiltinType::ObjCSel) &&
4464 !Context.ObjCSelRedefinitionType->isObjCSelType()) {
John Wiegley429bb272011-04-08 18:41:53 +00004465 BaseExpr = ImpCastExprToType(BaseExpr.take(), Context.ObjCSelRedefinitionType,
4466 CK_BitCast);
John McCall028d3972010-12-15 16:46:44 +00004467 return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS,
4468 ObjCImpDecl, HasTemplateArgs);
4469 }
4470
4471 // Failure cases.
4472 fail:
4473
Matt Beaumont-Gay65b34d72011-02-22 23:52:53 +00004474 // Recover from dot accesses to pointers, e.g.:
4475 // type *foo;
4476 // foo.bar
4477 // This is actually well-formed in two cases:
4478 // - 'type' is an Objective C type
4479 // - 'bar' is a pseudo-destructor name which happens to refer to
4480 // the appropriate pointer type
John McCall028d3972010-12-15 16:46:44 +00004481 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) {
Matt Beaumont-Gay65b34d72011-02-22 23:52:53 +00004482 if (!IsArrow && Ptr->getPointeeType()->isRecordType() &&
4483 MemberName.getNameKind() != DeclarationName::CXXDestructorName) {
John McCall028d3972010-12-15 16:46:44 +00004484 Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
John Wiegley429bb272011-04-08 18:41:53 +00004485 << BaseType << int(IsArrow) << BaseExpr.get()->getSourceRange()
Matt Beaumont-Gay65b34d72011-02-22 23:52:53 +00004486 << FixItHint::CreateReplacement(OpLoc, "->");
John McCall028d3972010-12-15 16:46:44 +00004487
4488 // Recurse as an -> access.
4489 IsArrow = true;
4490 return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS,
4491 ObjCImpDecl, HasTemplateArgs);
4492 }
John McCall028d3972010-12-15 16:46:44 +00004493 }
4494
Matt Beaumont-Gay65b34d72011-02-22 23:52:53 +00004495 // If the user is trying to apply -> or . to a function name, it's probably
4496 // because they forgot parentheses to call that function.
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00004497 QualType ZeroArgCallTy;
4498 UnresolvedSet<4> Overloads;
4499 if (isExprCallable(*BaseExpr.get(), ZeroArgCallTy, Overloads)) {
4500 if (ZeroArgCallTy.isNull()) {
John Wiegley429bb272011-04-08 18:41:53 +00004501 Diag(BaseExpr.get()->getExprLoc(), diag::err_member_reference_needs_call)
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00004502 << (Overloads.size() > 1) << 0 << BaseExpr.get()->getSourceRange();
4503 UnresolvedSet<2> PlausibleOverloads;
4504 for (OverloadExpr::decls_iterator It = Overloads.begin(),
4505 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
4506 const FunctionDecl *OverloadDecl = cast<FunctionDecl>(*It);
4507 QualType OverloadResultTy = OverloadDecl->getResultType();
4508 if ((!IsArrow && OverloadResultTy->isRecordType()) ||
4509 (IsArrow && OverloadResultTy->isPointerType() &&
4510 OverloadResultTy->getPointeeType()->isRecordType()))
4511 PlausibleOverloads.addDecl(It.getDecl());
Matt Beaumont-Gay65b34d72011-02-22 23:52:53 +00004512 }
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00004513 NoteOverloads(PlausibleOverloads, BaseExpr.get()->getExprLoc());
Matt Beaumont-Gay65b34d72011-02-22 23:52:53 +00004514 return ExprError();
4515 }
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00004516 if ((!IsArrow && ZeroArgCallTy->isRecordType()) ||
4517 (IsArrow && ZeroArgCallTy->isPointerType() &&
4518 ZeroArgCallTy->getPointeeType()->isRecordType())) {
4519 // At this point, we know BaseExpr looks like it's potentially callable
4520 // with 0 arguments, and that it returns something of a reasonable type,
4521 // so we can emit a fixit and carry on pretending that BaseExpr was
4522 // actually a CallExpr.
4523 SourceLocation ParenInsertionLoc =
4524 PP.getLocForEndOfToken(BaseExpr.get()->getLocEnd());
4525 Diag(BaseExpr.get()->getExprLoc(), diag::err_member_reference_needs_call)
4526 << (Overloads.size() > 1) << 1 << BaseExpr.get()->getSourceRange()
4527 << FixItHint::CreateInsertion(ParenInsertionLoc, "()");
4528 // FIXME: Try this before emitting the fixit, and suppress diagnostics
4529 // while doing so.
4530 ExprResult NewBase =
4531 ActOnCallExpr(0, BaseExpr.take(), ParenInsertionLoc,
4532 MultiExprArg(*this, 0, 0),
4533 ParenInsertionLoc.getFileLocWithOffset(1));
4534 if (NewBase.isInvalid())
4535 return ExprError();
4536 BaseExpr = NewBase;
4537 BaseExpr = DefaultFunctionArrayConversion(BaseExpr.take());
4538 return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS,
4539 ObjCImpDecl, HasTemplateArgs);
Matt Beaumont-Gay65b34d72011-02-22 23:52:53 +00004540 }
Matt Beaumont-Gay65b34d72011-02-22 23:52:53 +00004541 }
4542
Douglas Gregor214f31a2009-03-27 06:00:30 +00004543 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union)
John Wiegley429bb272011-04-08 18:41:53 +00004544 << BaseType << BaseExpr.get()->getSourceRange();
Douglas Gregor214f31a2009-03-27 06:00:30 +00004545
Douglas Gregor214f31a2009-03-27 06:00:30 +00004546 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00004547}
4548
John McCall129e2df2009-11-30 22:42:35 +00004549/// The main callback when the parser finds something like
4550/// expression . [nested-name-specifier] identifier
4551/// expression -> [nested-name-specifier] identifier
4552/// where 'identifier' encompasses a fairly broad spectrum of
4553/// possibilities, including destructor and operator references.
4554///
4555/// \param OpKind either tok::arrow or tok::period
4556/// \param HasTrailingLParen whether the next token is '(', which
4557/// is used to diagnose mis-uses of special members that can
4558/// only be called
4559/// \param ObjCImpDecl the current ObjC @implementation decl;
4560/// this is an ugly hack around the fact that ObjC @implementations
4561/// aren't properly put in the context chain
John McCall60d7b3a2010-08-24 06:29:42 +00004562ExprResult Sema::ActOnMemberAccessExpr(Scope *S, Expr *Base,
John McCall5e3c67b2010-12-15 04:42:30 +00004563 SourceLocation OpLoc,
4564 tok::TokenKind OpKind,
4565 CXXScopeSpec &SS,
4566 UnqualifiedId &Id,
4567 Decl *ObjCImpDecl,
4568 bool HasTrailingLParen) {
John McCall129e2df2009-11-30 22:42:35 +00004569 if (SS.isSet() && SS.isInvalid())
4570 return ExprError();
4571
Francois Pichetdbee3412011-01-18 05:04:39 +00004572 // Warn about the explicit constructor calls Microsoft extension.
4573 if (getLangOptions().Microsoft &&
4574 Id.getKind() == UnqualifiedId::IK_ConstructorName)
4575 Diag(Id.getSourceRange().getBegin(),
4576 diag::ext_ms_explicit_constructor_call);
4577
John McCall129e2df2009-11-30 22:42:35 +00004578 TemplateArgumentListInfo TemplateArgsBuffer;
4579
4580 // Decompose the name into its component parts.
Abramo Bagnara25777432010-08-11 22:01:17 +00004581 DeclarationNameInfo NameInfo;
John McCall129e2df2009-11-30 22:42:35 +00004582 const TemplateArgumentListInfo *TemplateArgs;
4583 DecomposeUnqualifiedId(*this, Id, TemplateArgsBuffer,
Abramo Bagnara25777432010-08-11 22:01:17 +00004584 NameInfo, TemplateArgs);
John McCall129e2df2009-11-30 22:42:35 +00004585
Abramo Bagnara25777432010-08-11 22:01:17 +00004586 DeclarationName Name = NameInfo.getName();
John McCall129e2df2009-11-30 22:42:35 +00004587 bool IsArrow = (OpKind == tok::arrow);
4588
4589 NamedDecl *FirstQualifierInScope
4590 = (!SS.isSet() ? 0 : FindFirstQualifierInScope(S,
4591 static_cast<NestedNameSpecifier*>(SS.getScopeRep())));
4592
4593 // This is a postfix expression, so get rid of ParenListExprs.
John McCall60d7b3a2010-08-24 06:29:42 +00004594 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base);
John McCall9ae2f072010-08-23 23:25:46 +00004595 if (Result.isInvalid()) return ExprError();
4596 Base = Result.take();
John McCall129e2df2009-11-30 22:42:35 +00004597
Douglas Gregor01e56ae2010-04-12 20:54:26 +00004598 if (Base->getType()->isDependentType() || Name.isDependentName() ||
4599 isDependentScopeSpecifier(SS)) {
John McCall9ae2f072010-08-23 23:25:46 +00004600 Result = ActOnDependentMemberExpr(Base, Base->getType(),
John McCall129e2df2009-11-30 22:42:35 +00004601 IsArrow, OpLoc,
4602 SS, FirstQualifierInScope,
Abramo Bagnara25777432010-08-11 22:01:17 +00004603 NameInfo, TemplateArgs);
John McCall129e2df2009-11-30 22:42:35 +00004604 } else {
Abramo Bagnara25777432010-08-11 22:01:17 +00004605 LookupResult R(*this, NameInfo, LookupMemberName);
John Wiegley429bb272011-04-08 18:41:53 +00004606 ExprResult BaseResult = Owned(Base);
4607 Result = LookupMemberExpr(R, BaseResult, IsArrow, OpLoc,
John McCallad00b772010-06-16 08:42:20 +00004608 SS, ObjCImpDecl, TemplateArgs != 0);
John Wiegley429bb272011-04-08 18:41:53 +00004609 if (BaseResult.isInvalid())
4610 return ExprError();
4611 Base = BaseResult.take();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00004612
John McCallad00b772010-06-16 08:42:20 +00004613 if (Result.isInvalid()) {
4614 Owned(Base);
4615 return ExprError();
4616 }
John McCall129e2df2009-11-30 22:42:35 +00004617
John McCallad00b772010-06-16 08:42:20 +00004618 if (Result.get()) {
4619 // The only way a reference to a destructor can be used is to
4620 // immediately call it, which falls into this case. If the
4621 // next token is not a '(', produce a diagnostic and build the
4622 // call now.
4623 if (!HasTrailingLParen &&
4624 Id.getKind() == UnqualifiedId::IK_DestructorName)
John McCall9ae2f072010-08-23 23:25:46 +00004625 return DiagnoseDtorReference(NameInfo.getLoc(), Result.get());
John McCall129e2df2009-11-30 22:42:35 +00004626
John McCallad00b772010-06-16 08:42:20 +00004627 return move(Result);
John McCall129e2df2009-11-30 22:42:35 +00004628 }
4629
John McCall9ae2f072010-08-23 23:25:46 +00004630 Result = BuildMemberReferenceExpr(Base, Base->getType(),
John McCallc2233c52010-01-15 08:34:02 +00004631 OpLoc, IsArrow, SS, FirstQualifierInScope,
4632 R, TemplateArgs);
John McCall129e2df2009-11-30 22:42:35 +00004633 }
4634
4635 return move(Result);
Anders Carlsson8f28f992009-08-26 18:25:21 +00004636}
4637
John McCall60d7b3a2010-08-24 06:29:42 +00004638ExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc,
Nico Weber08e41a62010-11-29 18:19:25 +00004639 FunctionDecl *FD,
4640 ParmVarDecl *Param) {
Anders Carlsson56c5e332009-08-25 03:49:14 +00004641 if (Param->hasUnparsedDefaultArg()) {
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004642 Diag(CallLoc,
Nico Weber15d5c832010-11-30 04:44:33 +00004643 diag::err_use_of_default_argument_to_function_declared_later) <<
Anders Carlsson56c5e332009-08-25 03:49:14 +00004644 FD << cast<CXXRecordDecl>(FD->getDeclContext())->getDeclName();
Mike Stump1eb44332009-09-09 15:08:12 +00004645 Diag(UnparsedDefaultArgLocs[Param],
Nico Weber15d5c832010-11-30 04:44:33 +00004646 diag::note_default_argument_declared_here);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004647 return ExprError();
4648 }
4649
4650 if (Param->hasUninstantiatedDefaultArg()) {
4651 Expr *UninstExpr = Param->getUninstantiatedDefaultArg();
Anders Carlsson56c5e332009-08-25 03:49:14 +00004652
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004653 // Instantiate the expression.
4654 MultiLevelTemplateArgumentList ArgList
4655 = getTemplateInstantiationArgs(FD, 0, /*RelativeToPrimary=*/true);
Anders Carlsson25cae7f2009-09-05 05:14:19 +00004656
Nico Weber08e41a62010-11-29 18:19:25 +00004657 std::pair<const TemplateArgument *, unsigned> Innermost
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004658 = ArgList.getInnermost();
4659 InstantiatingTemplate Inst(*this, CallLoc, Param, Innermost.first,
4660 Innermost.second);
Anders Carlsson56c5e332009-08-25 03:49:14 +00004661
Nico Weber08e41a62010-11-29 18:19:25 +00004662 ExprResult Result;
4663 {
4664 // C++ [dcl.fct.default]p5:
4665 // The names in the [default argument] expression are bound, and
4666 // the semantic constraints are checked, at the point where the
4667 // default argument expression appears.
Nico Weber15d5c832010-11-30 04:44:33 +00004668 ContextRAII SavedContext(*this, FD);
Nico Weber08e41a62010-11-29 18:19:25 +00004669 Result = SubstExpr(UninstExpr, ArgList);
4670 }
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004671 if (Result.isInvalid())
4672 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00004673
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004674 // Check the expression as an initializer for the parameter.
4675 InitializedEntity Entity
Fariborz Jahanian745da3a2010-09-24 17:30:16 +00004676 = InitializedEntity::InitializeParameter(Context, Param);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004677 InitializationKind Kind
4678 = InitializationKind::CreateCopy(Param->getLocation(),
4679 /*FIXME:EqualLoc*/UninstExpr->getSourceRange().getBegin());
4680 Expr *ResultE = Result.takeAs<Expr>();
Douglas Gregor65222e82009-12-23 18:19:08 +00004681
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004682 InitializationSequence InitSeq(*this, Entity, Kind, &ResultE, 1);
4683 Result = InitSeq.Perform(*this, Entity, Kind,
4684 MultiExprArg(*this, &ResultE, 1));
4685 if (Result.isInvalid())
4686 return ExprError();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004687
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004688 // Build the default argument expression.
4689 return Owned(CXXDefaultArgExpr::Create(Context, CallLoc, Param,
4690 Result.takeAs<Expr>()));
Anders Carlsson56c5e332009-08-25 03:49:14 +00004691 }
4692
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004693 // If the default expression creates temporaries, we need to
4694 // push them to the current stack of expression temporaries so they'll
4695 // be properly destroyed.
4696 // FIXME: We should really be rebuilding the default argument with new
4697 // bound temporaries; see the comment in PR5810.
Douglas Gregor5833b0b2010-09-14 22:55:20 +00004698 for (unsigned i = 0, e = Param->getNumDefaultArgTemporaries(); i != e; ++i) {
4699 CXXTemporary *Temporary = Param->getDefaultArgTemporary(i);
4700 MarkDeclarationReferenced(Param->getDefaultArg()->getLocStart(),
4701 const_cast<CXXDestructorDecl*>(Temporary->getDestructor()));
4702 ExprTemporaries.push_back(Temporary);
4703 }
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004704
4705 // We already type-checked the argument, so we know it works.
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00004706 // Just mark all of the declarations in this potentially-evaluated expression
4707 // as being "referenced".
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00004708 MarkDeclarationsReferencedInExpr(Param->getDefaultArg());
Douglas Gregor036aed12009-12-23 23:03:06 +00004709 return Owned(CXXDefaultArgExpr::Create(Context, CallLoc, Param));
Anders Carlsson56c5e332009-08-25 03:49:14 +00004710}
4711
Douglas Gregor88a35142008-12-22 05:46:06 +00004712/// ConvertArgumentsForCall - Converts the arguments specified in
4713/// Args/NumArgs to the parameter types of the function FDecl with
4714/// function prototype Proto. Call is the call expression itself, and
4715/// Fn is the function expression. For a C++ member function, this
4716/// routine does not attempt to convert the object argument. Returns
4717/// true if the call is ill-formed.
Mike Stumpeed9cac2009-02-19 03:04:26 +00004718bool
4719Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn,
Douglas Gregor88a35142008-12-22 05:46:06 +00004720 FunctionDecl *FDecl,
Douglas Gregor72564e72009-02-26 23:50:07 +00004721 const FunctionProtoType *Proto,
Douglas Gregor88a35142008-12-22 05:46:06 +00004722 Expr **Args, unsigned NumArgs,
4723 SourceLocation RParenLoc) {
John McCall8e10f3b2011-02-26 05:39:39 +00004724 // Bail out early if calling a builtin with custom typechecking.
4725 // We don't need to do this in the
4726 if (FDecl)
4727 if (unsigned ID = FDecl->getBuiltinID())
4728 if (Context.BuiltinInfo.hasCustomTypechecking(ID))
4729 return false;
4730
Mike Stumpeed9cac2009-02-19 03:04:26 +00004731 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by
Douglas Gregor88a35142008-12-22 05:46:06 +00004732 // assignment, to the types of the corresponding parameter, ...
4733 unsigned NumArgsInProto = Proto->getNumArgs();
Douglas Gregor3fd56d72009-01-23 21:30:56 +00004734 bool Invalid = false;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004735
Douglas Gregor88a35142008-12-22 05:46:06 +00004736 // If too few arguments are available (and we don't have default
4737 // arguments for the remaining parameters), don't make the call.
4738 if (NumArgs < NumArgsInProto) {
4739 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments())
4740 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args)
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00004741 << Fn->getType()->isBlockPointerType()
Eric Christopherd77b9a22010-04-16 04:48:22 +00004742 << NumArgsInProto << NumArgs << Fn->getSourceRange();
Ted Kremenek8189cde2009-02-07 01:47:29 +00004743 Call->setNumArgs(Context, NumArgsInProto);
Douglas Gregor88a35142008-12-22 05:46:06 +00004744 }
4745
4746 // If too many are passed and not variadic, error on the extras and drop
4747 // them.
4748 if (NumArgs > NumArgsInProto) {
4749 if (!Proto->isVariadic()) {
4750 Diag(Args[NumArgsInProto]->getLocStart(),
4751 diag::err_typecheck_call_too_many_args)
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00004752 << Fn->getType()->isBlockPointerType()
Eric Christopherccfa9632010-04-16 04:56:46 +00004753 << NumArgsInProto << NumArgs << Fn->getSourceRange()
Douglas Gregor88a35142008-12-22 05:46:06 +00004754 << SourceRange(Args[NumArgsInProto]->getLocStart(),
4755 Args[NumArgs-1]->getLocEnd());
Ted Kremenek5862f0e2011-04-04 17:22:27 +00004756
4757 // Emit the location of the prototype.
4758 if (FDecl && !FDecl->getBuiltinID())
4759 Diag(FDecl->getLocStart(),
4760 diag::note_typecheck_call_too_many_args)
4761 << FDecl;
4762
Douglas Gregor88a35142008-12-22 05:46:06 +00004763 // This deletes the extra arguments.
Ted Kremenek8189cde2009-02-07 01:47:29 +00004764 Call->setNumArgs(Context, NumArgsInProto);
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004765 return true;
Douglas Gregor88a35142008-12-22 05:46:06 +00004766 }
Douglas Gregor88a35142008-12-22 05:46:06 +00004767 }
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004768 llvm::SmallVector<Expr *, 8> AllArgs;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004769 VariadicCallType CallType =
Fariborz Jahanian4cd1c702009-11-24 19:27:49 +00004770 Proto->isVariadic() ? VariadicFunction : VariadicDoesNotApply;
4771 if (Fn->getType()->isBlockPointerType())
4772 CallType = VariadicBlock; // Block
4773 else if (isa<MemberExpr>(Fn))
4774 CallType = VariadicMethod;
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004775 Invalid = GatherArgumentsForCall(Call->getSourceRange().getBegin(), FDecl,
Fariborz Jahanian2fe168f2009-11-24 21:37:28 +00004776 Proto, 0, Args, NumArgs, AllArgs, CallType);
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004777 if (Invalid)
4778 return true;
4779 unsigned TotalNumArgs = AllArgs.size();
4780 for (unsigned i = 0; i < TotalNumArgs; ++i)
4781 Call->setArg(i, AllArgs[i]);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004782
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004783 return false;
4784}
Mike Stumpeed9cac2009-02-19 03:04:26 +00004785
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004786bool Sema::GatherArgumentsForCall(SourceLocation CallLoc,
4787 FunctionDecl *FDecl,
4788 const FunctionProtoType *Proto,
4789 unsigned FirstProtoArg,
4790 Expr **Args, unsigned NumArgs,
4791 llvm::SmallVector<Expr *, 8> &AllArgs,
Fariborz Jahanian4cd1c702009-11-24 19:27:49 +00004792 VariadicCallType CallType) {
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004793 unsigned NumArgsInProto = Proto->getNumArgs();
4794 unsigned NumArgsToCheck = NumArgs;
4795 bool Invalid = false;
4796 if (NumArgs != NumArgsInProto)
4797 // Use default arguments for missing arguments
4798 NumArgsToCheck = NumArgsInProto;
4799 unsigned ArgIx = 0;
Douglas Gregor88a35142008-12-22 05:46:06 +00004800 // Continue to check argument types (even if we have too few/many args).
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004801 for (unsigned i = FirstProtoArg; i != NumArgsToCheck; i++) {
Douglas Gregor88a35142008-12-22 05:46:06 +00004802 QualType ProtoArgType = Proto->getArgType(i);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004803
Douglas Gregor88a35142008-12-22 05:46:06 +00004804 Expr *Arg;
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004805 if (ArgIx < NumArgs) {
4806 Arg = Args[ArgIx++];
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004807
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00004808 if (RequireCompleteType(Arg->getSourceRange().getBegin(),
4809 ProtoArgType,
Anders Carlssonb7906612009-08-26 23:45:07 +00004810 PDiag(diag::err_call_incomplete_argument)
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004811 << Arg->getSourceRange()))
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00004812 return true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004813
Douglas Gregora188ff22009-12-22 16:09:06 +00004814 // Pass the argument
4815 ParmVarDecl *Param = 0;
4816 if (FDecl && i < FDecl->getNumParams())
4817 Param = FDecl->getParamDecl(i);
Douglas Gregoraa037312009-12-22 07:24:36 +00004818
Douglas Gregora188ff22009-12-22 16:09:06 +00004819 InitializedEntity Entity =
Fariborz Jahanian745da3a2010-09-24 17:30:16 +00004820 Param? InitializedEntity::InitializeParameter(Context, Param)
4821 : InitializedEntity::InitializeParameter(Context, ProtoArgType);
John McCall60d7b3a2010-08-24 06:29:42 +00004822 ExprResult ArgE = PerformCopyInitialization(Entity,
John McCallf6a16482010-12-04 03:47:34 +00004823 SourceLocation(),
4824 Owned(Arg));
Douglas Gregora188ff22009-12-22 16:09:06 +00004825 if (ArgE.isInvalid())
4826 return true;
4827
4828 Arg = ArgE.takeAs<Expr>();
Anders Carlsson5e300d12009-06-12 16:51:40 +00004829 } else {
Anders Carlssoned961f92009-08-25 02:29:20 +00004830 ParmVarDecl *Param = FDecl->getParamDecl(i);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004831
John McCall60d7b3a2010-08-24 06:29:42 +00004832 ExprResult ArgExpr =
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004833 BuildCXXDefaultArgExpr(CallLoc, FDecl, Param);
Anders Carlsson56c5e332009-08-25 03:49:14 +00004834 if (ArgExpr.isInvalid())
4835 return true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004836
Anders Carlsson56c5e332009-08-25 03:49:14 +00004837 Arg = ArgExpr.takeAs<Expr>();
Anders Carlsson5e300d12009-06-12 16:51:40 +00004838 }
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004839 AllArgs.push_back(Arg);
Douglas Gregor88a35142008-12-22 05:46:06 +00004840 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004841
Douglas Gregor88a35142008-12-22 05:46:06 +00004842 // If this is a variadic call, handle args passed through "...".
Fariborz Jahanian4cd1c702009-11-24 19:27:49 +00004843 if (CallType != VariadicDoesNotApply) {
John McCall755d8492011-04-12 00:42:48 +00004844
4845 // Assume that extern "C" functions with variadic arguments that
4846 // return __unknown_anytype aren't *really* variadic.
4847 if (Proto->getResultType() == Context.UnknownAnyTy &&
4848 FDecl && FDecl->isExternC()) {
4849 for (unsigned i = ArgIx; i != NumArgs; ++i) {
4850 ExprResult arg;
4851 if (isa<ExplicitCastExpr>(Args[i]->IgnoreParens()))
4852 arg = DefaultFunctionArrayLvalueConversion(Args[i]);
4853 else
4854 arg = DefaultVariadicArgumentPromotion(Args[i], CallType, FDecl);
4855 Invalid |= arg.isInvalid();
4856 AllArgs.push_back(arg.take());
4857 }
4858
4859 // Otherwise do argument promotion, (C99 6.5.2.2p7).
4860 } else {
4861 for (unsigned i = ArgIx; i != NumArgs; ++i) {
4862 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], CallType, FDecl);
4863 Invalid |= Arg.isInvalid();
4864 AllArgs.push_back(Arg.take());
4865 }
Douglas Gregor88a35142008-12-22 05:46:06 +00004866 }
4867 }
Douglas Gregor3fd56d72009-01-23 21:30:56 +00004868 return Invalid;
Douglas Gregor88a35142008-12-22 05:46:06 +00004869}
4870
John McCall755d8492011-04-12 00:42:48 +00004871/// Given a function expression of unknown-any type, try to rebuild it
4872/// to have a function type.
4873static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *fn);
4874
Steve Narofff69936d2007-09-16 03:34:24 +00004875/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments.
Reid Spencer5f016e22007-07-11 17:01:13 +00004876/// This provides the location of the left/right parens and a list of comma
4877/// locations.
John McCall60d7b3a2010-08-24 06:29:42 +00004878ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00004879Sema::ActOnCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc,
Peter Collingbournee08ce652011-02-09 21:07:24 +00004880 MultiExprArg args, SourceLocation RParenLoc,
4881 Expr *ExecConfig) {
Sebastian Redl0eb23302009-01-19 00:08:26 +00004882 unsigned NumArgs = args.size();
Nate Begeman2ef13e52009-08-10 23:49:36 +00004883
4884 // Since this might be a postfix expression, get rid of ParenListExprs.
John McCall60d7b3a2010-08-24 06:29:42 +00004885 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Fn);
John McCall9ae2f072010-08-23 23:25:46 +00004886 if (Result.isInvalid()) return ExprError();
4887 Fn = Result.take();
Mike Stump1eb44332009-09-09 15:08:12 +00004888
John McCall9ae2f072010-08-23 23:25:46 +00004889 Expr **Args = args.release();
Mike Stump1eb44332009-09-09 15:08:12 +00004890
Douglas Gregor88a35142008-12-22 05:46:06 +00004891 if (getLangOptions().CPlusPlus) {
Douglas Gregora71d8192009-09-04 17:36:40 +00004892 // If this is a pseudo-destructor expression, build the call immediately.
4893 if (isa<CXXPseudoDestructorExpr>(Fn)) {
4894 if (NumArgs > 0) {
4895 // Pseudo-destructor calls should not have any arguments.
4896 Diag(Fn->getLocStart(), diag::err_pseudo_dtor_call_with_args)
Douglas Gregor849b2432010-03-31 17:46:05 +00004897 << FixItHint::CreateRemoval(
Douglas Gregora71d8192009-09-04 17:36:40 +00004898 SourceRange(Args[0]->getLocStart(),
4899 Args[NumArgs-1]->getLocEnd()));
Mike Stump1eb44332009-09-09 15:08:12 +00004900
Douglas Gregora71d8192009-09-04 17:36:40 +00004901 NumArgs = 0;
4902 }
Mike Stump1eb44332009-09-09 15:08:12 +00004903
Douglas Gregora71d8192009-09-04 17:36:40 +00004904 return Owned(new (Context) CallExpr(Context, Fn, 0, 0, Context.VoidTy,
John McCallf89e55a2010-11-18 06:31:45 +00004905 VK_RValue, RParenLoc));
Douglas Gregora71d8192009-09-04 17:36:40 +00004906 }
Mike Stump1eb44332009-09-09 15:08:12 +00004907
Douglas Gregor17330012009-02-04 15:01:18 +00004908 // Determine whether this is a dependent call inside a C++ template,
Mike Stumpeed9cac2009-02-19 03:04:26 +00004909 // in which case we won't do any semantic analysis now.
Mike Stump390b4cc2009-05-16 07:39:55 +00004910 // FIXME: Will need to cache the results of name lookup (including ADL) in
4911 // Fn.
Douglas Gregor17330012009-02-04 15:01:18 +00004912 bool Dependent = false;
4913 if (Fn->isTypeDependent())
4914 Dependent = true;
4915 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs))
4916 Dependent = true;
4917
Peter Collingbournee08ce652011-02-09 21:07:24 +00004918 if (Dependent) {
4919 if (ExecConfig) {
4920 return Owned(new (Context) CUDAKernelCallExpr(
4921 Context, Fn, cast<CallExpr>(ExecConfig), Args, NumArgs,
4922 Context.DependentTy, VK_RValue, RParenLoc));
4923 } else {
4924 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs,
4925 Context.DependentTy, VK_RValue,
4926 RParenLoc));
4927 }
4928 }
Douglas Gregor17330012009-02-04 15:01:18 +00004929
4930 // Determine whether this is a call to an object (C++ [over.call.object]).
4931 if (Fn->getType()->isRecordType())
4932 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs,
Douglas Gregora1a04782010-09-09 16:33:13 +00004933 RParenLoc));
Douglas Gregor17330012009-02-04 15:01:18 +00004934
John McCall755d8492011-04-12 00:42:48 +00004935 if (Fn->getType() == Context.UnknownAnyTy) {
4936 ExprResult result = rebuildUnknownAnyFunction(*this, Fn);
4937 if (result.isInvalid()) return ExprError();
4938 Fn = result.take();
4939 }
4940
John McCall864c0412011-04-26 20:42:42 +00004941 if (Fn->getType() == Context.BoundMemberTy) {
John McCallaa81e162009-12-01 22:10:20 +00004942 return BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs,
Douglas Gregora1a04782010-09-09 16:33:13 +00004943 RParenLoc);
John McCall129e2df2009-11-30 22:42:35 +00004944 }
John McCall864c0412011-04-26 20:42:42 +00004945 }
John McCall129e2df2009-11-30 22:42:35 +00004946
John McCall864c0412011-04-26 20:42:42 +00004947 // Check for overloaded calls. This can happen even in C due to extensions.
4948 if (Fn->getType() == Context.OverloadTy) {
4949 OverloadExpr::FindResult find = OverloadExpr::find(Fn);
4950
4951 // We aren't supposed to apply this logic if there's an '&' involved.
4952 if (!find.IsAddressOfOperand) {
4953 OverloadExpr *ovl = find.Expression;
4954 if (isa<UnresolvedLookupExpr>(ovl)) {
4955 UnresolvedLookupExpr *ULE = cast<UnresolvedLookupExpr>(ovl);
4956 return BuildOverloadedCallExpr(S, Fn, ULE, LParenLoc, Args, NumArgs,
4957 RParenLoc, ExecConfig);
4958 } else {
John McCallaa81e162009-12-01 22:10:20 +00004959 return BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs,
Douglas Gregora1a04782010-09-09 16:33:13 +00004960 RParenLoc);
Anders Carlsson83ccfc32009-10-03 17:40:22 +00004961 }
4962 }
Douglas Gregor88a35142008-12-22 05:46:06 +00004963 }
4964
Douglas Gregorfa047642009-02-04 00:32:51 +00004965 // If we're directly calling a function, get the appropriate declaration.
Mike Stumpeed9cac2009-02-19 03:04:26 +00004966
Eli Friedmanefa42f72009-12-26 03:35:45 +00004967 Expr *NakedFn = Fn->IgnoreParens();
Douglas Gregoref9b1492010-11-09 20:03:54 +00004968
John McCall3b4294e2009-12-16 12:17:52 +00004969 NamedDecl *NDecl = 0;
Douglas Gregord8f0ade2010-10-25 20:48:33 +00004970 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(NakedFn))
4971 if (UnOp->getOpcode() == UO_AddrOf)
4972 NakedFn = UnOp->getSubExpr()->IgnoreParens();
4973
John McCall3b4294e2009-12-16 12:17:52 +00004974 if (isa<DeclRefExpr>(NakedFn))
4975 NDecl = cast<DeclRefExpr>(NakedFn)->getDecl();
John McCall864c0412011-04-26 20:42:42 +00004976 else if (isa<MemberExpr>(NakedFn))
4977 NDecl = cast<MemberExpr>(NakedFn)->getMemberDecl();
John McCall3b4294e2009-12-16 12:17:52 +00004978
Peter Collingbournee08ce652011-02-09 21:07:24 +00004979 return BuildResolvedCallExpr(Fn, NDecl, LParenLoc, Args, NumArgs, RParenLoc,
4980 ExecConfig);
4981}
4982
4983ExprResult
4984Sema::ActOnCUDAExecConfigExpr(Scope *S, SourceLocation LLLLoc,
4985 MultiExprArg execConfig, SourceLocation GGGLoc) {
4986 FunctionDecl *ConfigDecl = Context.getcudaConfigureCallDecl();
4987 if (!ConfigDecl)
4988 return ExprError(Diag(LLLLoc, diag::err_undeclared_var_use)
4989 << "cudaConfigureCall");
4990 QualType ConfigQTy = ConfigDecl->getType();
4991
4992 DeclRefExpr *ConfigDR = new (Context) DeclRefExpr(
4993 ConfigDecl, ConfigQTy, VK_LValue, LLLLoc);
4994
4995 return ActOnCallExpr(S, ConfigDR, LLLLoc, execConfig, GGGLoc, 0);
John McCallaa81e162009-12-01 22:10:20 +00004996}
4997
John McCall3b4294e2009-12-16 12:17:52 +00004998/// BuildResolvedCallExpr - Build a call to a resolved expression,
4999/// i.e. an expression not of \p OverloadTy. The expression should
John McCallaa81e162009-12-01 22:10:20 +00005000/// unary-convert to an expression of function-pointer or
5001/// block-pointer type.
5002///
5003/// \param NDecl the declaration being called, if available
John McCall60d7b3a2010-08-24 06:29:42 +00005004ExprResult
John McCallaa81e162009-12-01 22:10:20 +00005005Sema::BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl,
5006 SourceLocation LParenLoc,
5007 Expr **Args, unsigned NumArgs,
Peter Collingbournee08ce652011-02-09 21:07:24 +00005008 SourceLocation RParenLoc,
5009 Expr *Config) {
John McCallaa81e162009-12-01 22:10:20 +00005010 FunctionDecl *FDecl = dyn_cast_or_null<FunctionDecl>(NDecl);
5011
Chris Lattner04421082008-04-08 04:40:51 +00005012 // Promote the function operand.
John Wiegley429bb272011-04-08 18:41:53 +00005013 ExprResult Result = UsualUnaryConversions(Fn);
5014 if (Result.isInvalid())
5015 return ExprError();
5016 Fn = Result.take();
Chris Lattner04421082008-04-08 04:40:51 +00005017
Chris Lattner925e60d2007-12-28 05:29:59 +00005018 // Make the call expr early, before semantic checks. This guarantees cleanup
5019 // of arguments and function on error.
Peter Collingbournee08ce652011-02-09 21:07:24 +00005020 CallExpr *TheCall;
5021 if (Config) {
5022 TheCall = new (Context) CUDAKernelCallExpr(Context, Fn,
5023 cast<CallExpr>(Config),
5024 Args, NumArgs,
5025 Context.BoolTy,
5026 VK_RValue,
5027 RParenLoc);
5028 } else {
5029 TheCall = new (Context) CallExpr(Context, Fn,
5030 Args, NumArgs,
5031 Context.BoolTy,
5032 VK_RValue,
5033 RParenLoc);
5034 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00005035
John McCall8e10f3b2011-02-26 05:39:39 +00005036 unsigned BuiltinID = (FDecl ? FDecl->getBuiltinID() : 0);
5037
5038 // Bail out early if calling a builtin with custom typechecking.
5039 if (BuiltinID && Context.BuiltinInfo.hasCustomTypechecking(BuiltinID))
5040 return CheckBuiltinFunctionCall(BuiltinID, TheCall);
5041
John McCall1de4d4e2011-04-07 08:22:57 +00005042 retry:
Steve Naroffdd972f22008-09-05 22:11:13 +00005043 const FunctionType *FuncT;
John McCall8e10f3b2011-02-26 05:39:39 +00005044 if (const PointerType *PT = Fn->getType()->getAs<PointerType>()) {
Steve Naroffdd972f22008-09-05 22:11:13 +00005045 // C99 6.5.2.2p1 - "The expression that denotes the called function shall
5046 // have type pointer to function".
John McCall183700f2009-09-21 23:43:11 +00005047 FuncT = PT->getPointeeType()->getAs<FunctionType>();
John McCall8e10f3b2011-02-26 05:39:39 +00005048 if (FuncT == 0)
5049 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
5050 << Fn->getType() << Fn->getSourceRange());
5051 } else if (const BlockPointerType *BPT =
5052 Fn->getType()->getAs<BlockPointerType>()) {
5053 FuncT = BPT->getPointeeType()->castAs<FunctionType>();
5054 } else {
John McCall1de4d4e2011-04-07 08:22:57 +00005055 // Handle calls to expressions of unknown-any type.
5056 if (Fn->getType() == Context.UnknownAnyTy) {
John McCall755d8492011-04-12 00:42:48 +00005057 ExprResult rewrite = rebuildUnknownAnyFunction(*this, Fn);
John McCall1de4d4e2011-04-07 08:22:57 +00005058 if (rewrite.isInvalid()) return ExprError();
5059 Fn = rewrite.take();
John McCalla5fc4722011-04-09 22:50:59 +00005060 TheCall->setCallee(Fn);
John McCall1de4d4e2011-04-07 08:22:57 +00005061 goto retry;
5062 }
5063
Sebastian Redl0eb23302009-01-19 00:08:26 +00005064 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
5065 << Fn->getType() << Fn->getSourceRange());
John McCall8e10f3b2011-02-26 05:39:39 +00005066 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00005067
Peter Collingbourne0423fc62011-02-23 01:53:29 +00005068 if (getLangOptions().CUDA) {
5069 if (Config) {
5070 // CUDA: Kernel calls must be to global functions
5071 if (FDecl && !FDecl->hasAttr<CUDAGlobalAttr>())
5072 return ExprError(Diag(LParenLoc,diag::err_kern_call_not_global_function)
5073 << FDecl->getName() << Fn->getSourceRange());
5074
5075 // CUDA: Kernel function must have 'void' return type
5076 if (!FuncT->getResultType()->isVoidType())
5077 return ExprError(Diag(LParenLoc, diag::err_kern_type_not_void_return)
5078 << Fn->getType() << Fn->getSourceRange());
5079 }
5080 }
5081
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00005082 // Check for a valid return type
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005083 if (CheckCallReturnType(FuncT->getResultType(),
John McCall9ae2f072010-08-23 23:25:46 +00005084 Fn->getSourceRange().getBegin(), TheCall,
Anders Carlsson8c8d9192009-10-09 23:51:55 +00005085 FDecl))
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00005086 return ExprError();
5087
Chris Lattner925e60d2007-12-28 05:29:59 +00005088 // We know the result type of the call, set it.
Douglas Gregor5291c3c2010-07-13 08:18:22 +00005089 TheCall->setType(FuncT->getCallResultType(Context));
John McCallf89e55a2010-11-18 06:31:45 +00005090 TheCall->setValueKind(Expr::getValueKindForType(FuncT->getResultType()));
Sebastian Redl0eb23302009-01-19 00:08:26 +00005091
Douglas Gregor72564e72009-02-26 23:50:07 +00005092 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) {
John McCall9ae2f072010-08-23 23:25:46 +00005093 if (ConvertArgumentsForCall(TheCall, Fn, FDecl, Proto, Args, NumArgs,
Douglas Gregor88a35142008-12-22 05:46:06 +00005094 RParenLoc))
Sebastian Redl0eb23302009-01-19 00:08:26 +00005095 return ExprError();
Chris Lattner925e60d2007-12-28 05:29:59 +00005096 } else {
Douglas Gregor72564e72009-02-26 23:50:07 +00005097 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!");
Sebastian Redl0eb23302009-01-19 00:08:26 +00005098
Douglas Gregor74734d52009-04-02 15:37:10 +00005099 if (FDecl) {
5100 // Check if we have too few/too many template arguments, based
5101 // on our knowledge of the function definition.
5102 const FunctionDecl *Def = 0;
Argyrios Kyrtzidis06a54a32010-07-07 11:31:19 +00005103 if (FDecl->hasBody(Def) && NumArgs != Def->param_size()) {
Douglas Gregor46542412010-10-25 20:39:23 +00005104 const FunctionProtoType *Proto
5105 = Def->getType()->getAs<FunctionProtoType>();
5106 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size()))
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00005107 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments)
5108 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange();
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00005109 }
Douglas Gregor46542412010-10-25 20:39:23 +00005110
5111 // If the function we're calling isn't a function prototype, but we have
5112 // a function prototype from a prior declaratiom, use that prototype.
5113 if (!FDecl->hasPrototype())
5114 Proto = FDecl->getType()->getAs<FunctionProtoType>();
Douglas Gregor74734d52009-04-02 15:37:10 +00005115 }
5116
Steve Naroffb291ab62007-08-28 23:30:39 +00005117 // Promote the arguments (C99 6.5.2.2p6).
Chris Lattner925e60d2007-12-28 05:29:59 +00005118 for (unsigned i = 0; i != NumArgs; i++) {
5119 Expr *Arg = Args[i];
Douglas Gregor46542412010-10-25 20:39:23 +00005120
5121 if (Proto && i < Proto->getNumArgs()) {
Douglas Gregor46542412010-10-25 20:39:23 +00005122 InitializedEntity Entity
5123 = InitializedEntity::InitializeParameter(Context,
5124 Proto->getArgType(i));
5125 ExprResult ArgE = PerformCopyInitialization(Entity,
5126 SourceLocation(),
5127 Owned(Arg));
5128 if (ArgE.isInvalid())
5129 return true;
5130
5131 Arg = ArgE.takeAs<Expr>();
5132
5133 } else {
John Wiegley429bb272011-04-08 18:41:53 +00005134 ExprResult ArgE = DefaultArgumentPromotion(Arg);
5135
5136 if (ArgE.isInvalid())
5137 return true;
5138
5139 Arg = ArgE.takeAs<Expr>();
Douglas Gregor46542412010-10-25 20:39:23 +00005140 }
5141
Douglas Gregor0700bbf2010-10-26 05:45:40 +00005142 if (RequireCompleteType(Arg->getSourceRange().getBegin(),
5143 Arg->getType(),
5144 PDiag(diag::err_call_incomplete_argument)
5145 << Arg->getSourceRange()))
5146 return ExprError();
5147
Chris Lattner925e60d2007-12-28 05:29:59 +00005148 TheCall->setArg(i, Arg);
Steve Naroffb291ab62007-08-28 23:30:39 +00005149 }
Reid Spencer5f016e22007-07-11 17:01:13 +00005150 }
Chris Lattner925e60d2007-12-28 05:29:59 +00005151
Douglas Gregor88a35142008-12-22 05:46:06 +00005152 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl))
5153 if (!Method->isStatic())
Sebastian Redl0eb23302009-01-19 00:08:26 +00005154 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object)
5155 << Fn->getSourceRange());
Douglas Gregor88a35142008-12-22 05:46:06 +00005156
Fariborz Jahaniandaf04152009-05-15 20:33:25 +00005157 // Check for sentinels
5158 if (NDecl)
5159 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs);
Mike Stump1eb44332009-09-09 15:08:12 +00005160
Chris Lattner59907c42007-08-10 20:18:51 +00005161 // Do special checking on direct calls to functions.
Anders Carlssond406bf02009-08-16 01:56:34 +00005162 if (FDecl) {
John McCall9ae2f072010-08-23 23:25:46 +00005163 if (CheckFunctionCall(FDecl, TheCall))
Anders Carlssond406bf02009-08-16 01:56:34 +00005164 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00005165
John McCall8e10f3b2011-02-26 05:39:39 +00005166 if (BuiltinID)
Fariborz Jahanian67aba812010-11-30 17:35:24 +00005167 return CheckBuiltinFunctionCall(BuiltinID, TheCall);
Anders Carlssond406bf02009-08-16 01:56:34 +00005168 } else if (NDecl) {
John McCall9ae2f072010-08-23 23:25:46 +00005169 if (CheckBlockCall(NDecl, TheCall))
Anders Carlssond406bf02009-08-16 01:56:34 +00005170 return ExprError();
5171 }
Chris Lattner59907c42007-08-10 20:18:51 +00005172
John McCall9ae2f072010-08-23 23:25:46 +00005173 return MaybeBindToTemporary(TheCall);
Reid Spencer5f016e22007-07-11 17:01:13 +00005174}
5175
John McCall60d7b3a2010-08-24 06:29:42 +00005176ExprResult
John McCallb3d87482010-08-24 05:47:05 +00005177Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, ParsedType Ty,
John McCall9ae2f072010-08-23 23:25:46 +00005178 SourceLocation RParenLoc, Expr *InitExpr) {
Steve Narofff69936d2007-09-16 03:34:24 +00005179 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type");
Steve Naroffaff1edd2007-07-19 21:32:11 +00005180 // FIXME: put back this assert when initializers are worked out.
Steve Narofff69936d2007-09-16 03:34:24 +00005181 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression");
John McCall42f56b52010-01-18 19:35:47 +00005182
5183 TypeSourceInfo *TInfo;
5184 QualType literalType = GetTypeFromParser(Ty, &TInfo);
5185 if (!TInfo)
5186 TInfo = Context.getTrivialTypeSourceInfo(literalType);
5187
John McCall9ae2f072010-08-23 23:25:46 +00005188 return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, InitExpr);
John McCall42f56b52010-01-18 19:35:47 +00005189}
5190
John McCall60d7b3a2010-08-24 06:29:42 +00005191ExprResult
John McCall42f56b52010-01-18 19:35:47 +00005192Sema::BuildCompoundLiteralExpr(SourceLocation LParenLoc, TypeSourceInfo *TInfo,
John McCall9ae2f072010-08-23 23:25:46 +00005193 SourceLocation RParenLoc, Expr *literalExpr) {
John McCall42f56b52010-01-18 19:35:47 +00005194 QualType literalType = TInfo->getType();
Anders Carlssond35c8322007-12-05 07:24:19 +00005195
Eli Friedman6223c222008-05-20 05:22:08 +00005196 if (literalType->isArrayType()) {
Argyrios Kyrtzidise6fe9a22010-11-08 19:14:19 +00005197 if (RequireCompleteType(LParenLoc, Context.getBaseElementType(literalType),
5198 PDiag(diag::err_illegal_decl_array_incomplete_type)
5199 << SourceRange(LParenLoc,
5200 literalExpr->getSourceRange().getEnd())))
5201 return ExprError();
Chris Lattnerc63a1f22008-08-04 07:31:14 +00005202 if (literalType->isVariableArrayType())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005203 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init)
5204 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()));
Douglas Gregor690dc7f2009-05-21 23:48:18 +00005205 } else if (!literalType->isDependentType() &&
5206 RequireCompleteType(LParenLoc, literalType,
Anders Carlssonb7906612009-08-26 23:45:07 +00005207 PDiag(diag::err_typecheck_decl_incomplete_type)
Mike Stump1eb44332009-09-09 15:08:12 +00005208 << SourceRange(LParenLoc,
Anders Carlssonb7906612009-08-26 23:45:07 +00005209 literalExpr->getSourceRange().getEnd())))
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005210 return ExprError();
Eli Friedman6223c222008-05-20 05:22:08 +00005211
Douglas Gregor99a2e602009-12-16 01:38:02 +00005212 InitializedEntity Entity
Douglas Gregord6542d82009-12-22 15:35:07 +00005213 = InitializedEntity::InitializeTemporary(literalType);
Douglas Gregor99a2e602009-12-16 01:38:02 +00005214 InitializationKind Kind
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005215 = InitializationKind::CreateCast(SourceRange(LParenLoc, RParenLoc),
Douglas Gregor99a2e602009-12-16 01:38:02 +00005216 /*IsCStyleCast=*/true);
Eli Friedman08544622009-12-22 02:35:53 +00005217 InitializationSequence InitSeq(*this, Entity, Kind, &literalExpr, 1);
John McCall60d7b3a2010-08-24 06:29:42 +00005218 ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
John McCallca0408f2010-08-23 06:44:23 +00005219 MultiExprArg(*this, &literalExpr, 1),
Eli Friedman08544622009-12-22 02:35:53 +00005220 &literalType);
5221 if (Result.isInvalid())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005222 return ExprError();
John McCall9ae2f072010-08-23 23:25:46 +00005223 literalExpr = Result.get();
Steve Naroffe9b12192008-01-14 18:19:28 +00005224
Chris Lattner371f2582008-12-04 23:50:19 +00005225 bool isFileScope = getCurFunctionOrMethodDecl() == 0;
Steve Naroffe9b12192008-01-14 18:19:28 +00005226 if (isFileScope) { // 6.5.2.5p3
Steve Naroffd0091aa2008-01-10 22:15:12 +00005227 if (CheckForConstantInitializer(literalExpr, literalType))
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005228 return ExprError();
Steve Naroffd0091aa2008-01-10 22:15:12 +00005229 }
Eli Friedman08544622009-12-22 02:35:53 +00005230
John McCallf89e55a2010-11-18 06:31:45 +00005231 // In C, compound literals are l-values for some reason.
5232 ExprValueKind VK = getLangOptions().CPlusPlus ? VK_RValue : VK_LValue;
5233
John McCall1d7d8d62010-01-19 22:33:45 +00005234 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, TInfo, literalType,
John McCallf89e55a2010-11-18 06:31:45 +00005235 VK, literalExpr, isFileScope));
Steve Naroff4aa88f82007-07-19 01:06:55 +00005236}
5237
John McCall60d7b3a2010-08-24 06:29:42 +00005238ExprResult
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005239Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist,
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005240 SourceLocation RBraceLoc) {
5241 unsigned NumInit = initlist.size();
John McCall9ae2f072010-08-23 23:25:46 +00005242 Expr **InitList = initlist.release();
Anders Carlsson66b5a8a2007-08-31 04:56:16 +00005243
Steve Naroff08d92e42007-09-15 18:49:24 +00005244 // Semantic analysis for initializers is done by ActOnDeclarator() and
Mike Stumpeed9cac2009-02-19 03:04:26 +00005245 // CheckInitializer() - it requires knowledge of the object being intialized.
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005246
Ted Kremenek709210f2010-04-13 23:39:13 +00005247 InitListExpr *E = new (Context) InitListExpr(Context, LBraceLoc, InitList,
5248 NumInit, RBraceLoc);
Chris Lattnerf0467b32008-04-02 04:24:33 +00005249 E->setType(Context.VoidTy); // FIXME: just a place holder for now.
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005250 return Owned(E);
Steve Naroff4aa88f82007-07-19 01:06:55 +00005251}
5252
John McCallf3ea8cf2010-11-14 08:17:51 +00005253/// Prepares for a scalar cast, performing all the necessary stages
5254/// except the final cast and returning the kind required.
John Wiegley429bb272011-04-08 18:41:53 +00005255static CastKind PrepareScalarCast(Sema &S, ExprResult &Src, QualType DestTy) {
John McCallf3ea8cf2010-11-14 08:17:51 +00005256 // Both Src and Dest are scalar types, i.e. arithmetic or pointer.
5257 // Also, callers should have filtered out the invalid cases with
5258 // pointers. Everything else should be possible.
5259
John Wiegley429bb272011-04-08 18:41:53 +00005260 QualType SrcTy = Src.get()->getType();
John McCallf3ea8cf2010-11-14 08:17:51 +00005261 if (S.Context.hasSameUnqualifiedType(SrcTy, DestTy))
John McCall2de56d12010-08-25 11:45:40 +00005262 return CK_NoOp;
Anders Carlsson82debc72009-10-18 18:12:03 +00005263
John McCalldaa8e4e2010-11-15 09:13:47 +00005264 switch (SrcTy->getScalarTypeKind()) {
5265 case Type::STK_MemberPointer:
5266 llvm_unreachable("member pointer type in C");
Abramo Bagnarabb03f5d2011-01-04 09:50:03 +00005267
John McCalldaa8e4e2010-11-15 09:13:47 +00005268 case Type::STK_Pointer:
5269 switch (DestTy->getScalarTypeKind()) {
5270 case Type::STK_Pointer:
5271 return DestTy->isObjCObjectPointerType() ?
John McCallf3ea8cf2010-11-14 08:17:51 +00005272 CK_AnyPointerToObjCPointerCast :
5273 CK_BitCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00005274 case Type::STK_Bool:
5275 return CK_PointerToBoolean;
5276 case Type::STK_Integral:
5277 return CK_PointerToIntegral;
5278 case Type::STK_Floating:
5279 case Type::STK_FloatingComplex:
5280 case Type::STK_IntegralComplex:
5281 case Type::STK_MemberPointer:
5282 llvm_unreachable("illegal cast from pointer");
5283 }
5284 break;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005285
John McCalldaa8e4e2010-11-15 09:13:47 +00005286 case Type::STK_Bool: // casting from bool is like casting from an integer
5287 case Type::STK_Integral:
5288 switch (DestTy->getScalarTypeKind()) {
5289 case Type::STK_Pointer:
John Wiegley429bb272011-04-08 18:41:53 +00005290 if (Src.get()->isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNull))
John McCall404cd162010-11-13 01:35:44 +00005291 return CK_NullToPointer;
John McCall2de56d12010-08-25 11:45:40 +00005292 return CK_IntegralToPointer;
John McCalldaa8e4e2010-11-15 09:13:47 +00005293 case Type::STK_Bool:
5294 return CK_IntegralToBoolean;
5295 case Type::STK_Integral:
John McCallf3ea8cf2010-11-14 08:17:51 +00005296 return CK_IntegralCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00005297 case Type::STK_Floating:
John McCall2de56d12010-08-25 11:45:40 +00005298 return CK_IntegralToFloating;
John McCalldaa8e4e2010-11-15 09:13:47 +00005299 case Type::STK_IntegralComplex:
John Wiegley429bb272011-04-08 18:41:53 +00005300 Src = S.ImpCastExprToType(Src.take(), DestTy->getAs<ComplexType>()->getElementType(),
5301 CK_IntegralCast);
John McCallf3ea8cf2010-11-14 08:17:51 +00005302 return CK_IntegralRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00005303 case Type::STK_FloatingComplex:
John Wiegley429bb272011-04-08 18:41:53 +00005304 Src = S.ImpCastExprToType(Src.take(), DestTy->getAs<ComplexType>()->getElementType(),
5305 CK_IntegralToFloating);
John McCallf3ea8cf2010-11-14 08:17:51 +00005306 return CK_FloatingRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00005307 case Type::STK_MemberPointer:
5308 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00005309 }
5310 break;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005311
John McCalldaa8e4e2010-11-15 09:13:47 +00005312 case Type::STK_Floating:
5313 switch (DestTy->getScalarTypeKind()) {
5314 case Type::STK_Floating:
John McCall2de56d12010-08-25 11:45:40 +00005315 return CK_FloatingCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00005316 case Type::STK_Bool:
5317 return CK_FloatingToBoolean;
5318 case Type::STK_Integral:
John McCall2de56d12010-08-25 11:45:40 +00005319 return CK_FloatingToIntegral;
John McCalldaa8e4e2010-11-15 09:13:47 +00005320 case Type::STK_FloatingComplex:
John Wiegley429bb272011-04-08 18:41:53 +00005321 Src = S.ImpCastExprToType(Src.take(), DestTy->getAs<ComplexType>()->getElementType(),
5322 CK_FloatingCast);
John McCallf3ea8cf2010-11-14 08:17:51 +00005323 return CK_FloatingRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00005324 case Type::STK_IntegralComplex:
John Wiegley429bb272011-04-08 18:41:53 +00005325 Src = S.ImpCastExprToType(Src.take(), DestTy->getAs<ComplexType>()->getElementType(),
5326 CK_FloatingToIntegral);
John McCallf3ea8cf2010-11-14 08:17:51 +00005327 return CK_IntegralRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00005328 case Type::STK_Pointer:
5329 llvm_unreachable("valid float->pointer cast?");
5330 case Type::STK_MemberPointer:
5331 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00005332 }
5333 break;
5334
John McCalldaa8e4e2010-11-15 09:13:47 +00005335 case Type::STK_FloatingComplex:
5336 switch (DestTy->getScalarTypeKind()) {
5337 case Type::STK_FloatingComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00005338 return CK_FloatingComplexCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00005339 case Type::STK_IntegralComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00005340 return CK_FloatingComplexToIntegralComplex;
John McCall8786da72010-12-14 17:51:41 +00005341 case Type::STK_Floating: {
Abramo Bagnarabb03f5d2011-01-04 09:50:03 +00005342 QualType ET = SrcTy->getAs<ComplexType>()->getElementType();
John McCall8786da72010-12-14 17:51:41 +00005343 if (S.Context.hasSameType(ET, DestTy))
5344 return CK_FloatingComplexToReal;
John Wiegley429bb272011-04-08 18:41:53 +00005345 Src = S.ImpCastExprToType(Src.take(), ET, CK_FloatingComplexToReal);
John McCall8786da72010-12-14 17:51:41 +00005346 return CK_FloatingCast;
5347 }
John McCalldaa8e4e2010-11-15 09:13:47 +00005348 case Type::STK_Bool:
John McCallf3ea8cf2010-11-14 08:17:51 +00005349 return CK_FloatingComplexToBoolean;
John McCalldaa8e4e2010-11-15 09:13:47 +00005350 case Type::STK_Integral:
John Wiegley429bb272011-04-08 18:41:53 +00005351 Src = S.ImpCastExprToType(Src.take(), SrcTy->getAs<ComplexType>()->getElementType(),
5352 CK_FloatingComplexToReal);
John McCallf3ea8cf2010-11-14 08:17:51 +00005353 return CK_FloatingToIntegral;
John McCalldaa8e4e2010-11-15 09:13:47 +00005354 case Type::STK_Pointer:
5355 llvm_unreachable("valid complex float->pointer cast?");
5356 case Type::STK_MemberPointer:
5357 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00005358 }
5359 break;
5360
John McCalldaa8e4e2010-11-15 09:13:47 +00005361 case Type::STK_IntegralComplex:
5362 switch (DestTy->getScalarTypeKind()) {
5363 case Type::STK_FloatingComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00005364 return CK_IntegralComplexToFloatingComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00005365 case Type::STK_IntegralComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00005366 return CK_IntegralComplexCast;
John McCall8786da72010-12-14 17:51:41 +00005367 case Type::STK_Integral: {
Abramo Bagnarabb03f5d2011-01-04 09:50:03 +00005368 QualType ET = SrcTy->getAs<ComplexType>()->getElementType();
John McCall8786da72010-12-14 17:51:41 +00005369 if (S.Context.hasSameType(ET, DestTy))
5370 return CK_IntegralComplexToReal;
John Wiegley429bb272011-04-08 18:41:53 +00005371 Src = S.ImpCastExprToType(Src.take(), ET, CK_IntegralComplexToReal);
John McCall8786da72010-12-14 17:51:41 +00005372 return CK_IntegralCast;
5373 }
John McCalldaa8e4e2010-11-15 09:13:47 +00005374 case Type::STK_Bool:
John McCallf3ea8cf2010-11-14 08:17:51 +00005375 return CK_IntegralComplexToBoolean;
John McCalldaa8e4e2010-11-15 09:13:47 +00005376 case Type::STK_Floating:
John Wiegley429bb272011-04-08 18:41:53 +00005377 Src = S.ImpCastExprToType(Src.take(), SrcTy->getAs<ComplexType>()->getElementType(),
5378 CK_IntegralComplexToReal);
John McCallf3ea8cf2010-11-14 08:17:51 +00005379 return CK_IntegralToFloating;
John McCalldaa8e4e2010-11-15 09:13:47 +00005380 case Type::STK_Pointer:
5381 llvm_unreachable("valid complex int->pointer cast?");
5382 case Type::STK_MemberPointer:
5383 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00005384 }
5385 break;
Anders Carlsson82debc72009-10-18 18:12:03 +00005386 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005387
John McCallf3ea8cf2010-11-14 08:17:51 +00005388 llvm_unreachable("Unhandled scalar cast");
5389 return CK_BitCast;
Anders Carlsson82debc72009-10-18 18:12:03 +00005390}
5391
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00005392/// CheckCastTypes - Check type constraints for casting between types.
John Wiegley429bb272011-04-08 18:41:53 +00005393ExprResult Sema::CheckCastTypes(SourceRange TyR, QualType castType,
5394 Expr *castExpr, CastKind& Kind, ExprValueKind &VK,
5395 CXXCastPath &BasePath, bool FunctionalStyle) {
John McCall1de4d4e2011-04-07 08:22:57 +00005396 if (castExpr->getType() == Context.UnknownAnyTy)
5397 return checkUnknownAnyCast(TyR, castType, castExpr, Kind, VK, BasePath);
5398
Sebastian Redl9cc11e72009-07-25 15:41:38 +00005399 if (getLangOptions().CPlusPlus)
Douglas Gregor40749ee2010-11-03 00:35:38 +00005400 return CXXCheckCStyleCast(SourceRange(TyR.getBegin(),
5401 castExpr->getLocEnd()),
John McCallf89e55a2010-11-18 06:31:45 +00005402 castType, VK, castExpr, Kind, BasePath,
Anders Carlsson5cf86ba2010-04-24 19:06:50 +00005403 FunctionalStyle);
Sebastian Redl9cc11e72009-07-25 15:41:38 +00005404
John McCallfb8721c2011-04-10 19:13:55 +00005405 assert(!castExpr->getType()->isPlaceholderType());
5406
John McCallf89e55a2010-11-18 06:31:45 +00005407 // We only support r-value casts in C.
5408 VK = VK_RValue;
5409
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00005410 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression
5411 // type needs to be scalar.
5412 if (castType->isVoidType()) {
John McCallf6a16482010-12-04 03:47:34 +00005413 // We don't necessarily do lvalue-to-rvalue conversions on this.
John Wiegley429bb272011-04-08 18:41:53 +00005414 ExprResult castExprRes = IgnoredValueConversions(castExpr);
5415 if (castExprRes.isInvalid())
5416 return ExprError();
5417 castExpr = castExprRes.take();
John McCallf6a16482010-12-04 03:47:34 +00005418
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00005419 // Cast to void allows any expr type.
John McCall2de56d12010-08-25 11:45:40 +00005420 Kind = CK_ToVoid;
John Wiegley429bb272011-04-08 18:41:53 +00005421 return Owned(castExpr);
Anders Carlssonebeaf202009-10-16 02:35:04 +00005422 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005423
John Wiegley429bb272011-04-08 18:41:53 +00005424 ExprResult castExprRes = DefaultFunctionArrayLvalueConversion(castExpr);
5425 if (castExprRes.isInvalid())
5426 return ExprError();
5427 castExpr = castExprRes.take();
John McCallf6a16482010-12-04 03:47:34 +00005428
Eli Friedman8d438082010-07-17 20:43:49 +00005429 if (RequireCompleteType(TyR.getBegin(), castType,
5430 diag::err_typecheck_cast_to_incomplete))
John Wiegley429bb272011-04-08 18:41:53 +00005431 return ExprError();
Eli Friedman8d438082010-07-17 20:43:49 +00005432
Anders Carlssonebeaf202009-10-16 02:35:04 +00005433 if (!castType->isScalarType() && !castType->isVectorType()) {
Douglas Gregora4923eb2009-11-16 21:35:15 +00005434 if (Context.hasSameUnqualifiedType(castType, castExpr->getType()) &&
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00005435 (castType->isStructureType() || castType->isUnionType())) {
5436 // GCC struct/union extension: allow cast to self.
Eli Friedmanb1d796d2009-03-23 00:24:07 +00005437 // FIXME: Check that the cast destination type is complete.
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00005438 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar)
5439 << castType << castExpr->getSourceRange();
John McCall2de56d12010-08-25 11:45:40 +00005440 Kind = CK_NoOp;
John Wiegley429bb272011-04-08 18:41:53 +00005441 return Owned(castExpr);
Anders Carlssonc3516322009-10-16 02:48:28 +00005442 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005443
Anders Carlssonc3516322009-10-16 02:48:28 +00005444 if (castType->isUnionType()) {
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00005445 // GCC cast to union extension
Ted Kremenek6217b802009-07-29 21:53:49 +00005446 RecordDecl *RD = castType->getAs<RecordType>()->getDecl();
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00005447 RecordDecl::field_iterator Field, FieldEnd;
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00005448 for (Field = RD->field_begin(), FieldEnd = RD->field_end();
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00005449 Field != FieldEnd; ++Field) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005450 if (Context.hasSameUnqualifiedType(Field->getType(),
Abramo Bagnara8c4bfe52010-10-07 21:20:44 +00005451 castExpr->getType()) &&
5452 !Field->isUnnamedBitfield()) {
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00005453 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union)
5454 << castExpr->getSourceRange();
5455 break;
5456 }
5457 }
John Wiegley429bb272011-04-08 18:41:53 +00005458 if (Field == FieldEnd) {
5459 Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type)
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00005460 << castExpr->getType() << castExpr->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00005461 return ExprError();
5462 }
John McCall2de56d12010-08-25 11:45:40 +00005463 Kind = CK_ToUnion;
John Wiegley429bb272011-04-08 18:41:53 +00005464 return Owned(castExpr);
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00005465 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005466
Anders Carlssonc3516322009-10-16 02:48:28 +00005467 // Reject any other conversions to non-scalar types.
John Wiegley429bb272011-04-08 18:41:53 +00005468 Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar)
Anders Carlssonc3516322009-10-16 02:48:28 +00005469 << castType << castExpr->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00005470 return ExprError();
Anders Carlssonc3516322009-10-16 02:48:28 +00005471 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005472
John McCallf3ea8cf2010-11-14 08:17:51 +00005473 // The type we're casting to is known to be a scalar or vector.
5474
5475 // Require the operand to be a scalar or vector.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005476 if (!castExpr->getType()->isScalarType() &&
Anders Carlssonc3516322009-10-16 02:48:28 +00005477 !castExpr->getType()->isVectorType()) {
John Wiegley429bb272011-04-08 18:41:53 +00005478 Diag(castExpr->getLocStart(),
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00005479 diag::err_typecheck_expect_scalar_operand)
Chris Lattnerd1625842008-11-24 06:25:27 +00005480 << castExpr->getType() << castExpr->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00005481 return ExprError();
Anders Carlssonc3516322009-10-16 02:48:28 +00005482 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005483
5484 if (castType->isExtVectorType())
Anders Carlsson16a89042009-10-16 05:23:41 +00005485 return CheckExtVectorCast(TyR, castType, castExpr, Kind);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005486
Anton Yartsevd06fea82011-03-27 09:32:40 +00005487 if (castType->isVectorType()) {
5488 if (castType->getAs<VectorType>()->getVectorKind() ==
5489 VectorType::AltiVecVector &&
5490 (castExpr->getType()->isIntegerType() ||
5491 castExpr->getType()->isFloatingType())) {
5492 Kind = CK_VectorSplat;
John Wiegley429bb272011-04-08 18:41:53 +00005493 return Owned(castExpr);
5494 } else if (CheckVectorCast(TyR, castType, castExpr->getType(), Kind)) {
5495 return ExprError();
Anton Yartsevd06fea82011-03-27 09:32:40 +00005496 } else
John Wiegley429bb272011-04-08 18:41:53 +00005497 return Owned(castExpr);
Anton Yartsevd06fea82011-03-27 09:32:40 +00005498 }
John Wiegley429bb272011-04-08 18:41:53 +00005499 if (castExpr->getType()->isVectorType()) {
5500 if (CheckVectorCast(TyR, castExpr->getType(), castType, Kind))
5501 return ExprError();
5502 else
5503 return Owned(castExpr);
5504 }
Anders Carlssonc3516322009-10-16 02:48:28 +00005505
John McCallf3ea8cf2010-11-14 08:17:51 +00005506 // The source and target types are both scalars, i.e.
5507 // - arithmetic types (fundamental, enum, and complex)
5508 // - all kinds of pointers
5509 // Note that member pointers were filtered out with C++, above.
5510
John Wiegley429bb272011-04-08 18:41:53 +00005511 if (isa<ObjCSelectorExpr>(castExpr)) {
5512 Diag(castExpr->getLocStart(), diag::err_cast_selector_expr);
5513 return ExprError();
5514 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005515
John McCallf3ea8cf2010-11-14 08:17:51 +00005516 // If either type is a pointer, the other type has to be either an
5517 // integer or a pointer.
Anders Carlssonc3516322009-10-16 02:48:28 +00005518 if (!castType->isArithmeticType()) {
Eli Friedman41826bb2009-05-01 02:23:58 +00005519 QualType castExprType = castExpr->getType();
Douglas Gregor9d3347a2010-06-16 00:35:25 +00005520 if (!castExprType->isIntegralType(Context) &&
John Wiegley429bb272011-04-08 18:41:53 +00005521 castExprType->isArithmeticType()) {
5522 Diag(castExpr->getLocStart(),
5523 diag::err_cast_pointer_from_non_pointer_int)
Eli Friedman41826bb2009-05-01 02:23:58 +00005524 << castExprType << castExpr->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00005525 return ExprError();
5526 }
Eli Friedman41826bb2009-05-01 02:23:58 +00005527 } else if (!castExpr->getType()->isArithmeticType()) {
John Wiegley429bb272011-04-08 18:41:53 +00005528 if (!castType->isIntegralType(Context) && castType->isArithmeticType()) {
5529 Diag(castExpr->getLocStart(), diag::err_cast_pointer_to_non_pointer_int)
Eli Friedman41826bb2009-05-01 02:23:58 +00005530 << castType << castExpr->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00005531 return ExprError();
5532 }
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00005533 }
Anders Carlsson82debc72009-10-18 18:12:03 +00005534
John Wiegley429bb272011-04-08 18:41:53 +00005535 castExprRes = Owned(castExpr);
5536 Kind = PrepareScalarCast(*this, castExprRes, castType);
5537 if (castExprRes.isInvalid())
5538 return ExprError();
5539 castExpr = castExprRes.take();
John McCallb7f4ffe2010-08-12 21:44:57 +00005540
John McCallf3ea8cf2010-11-14 08:17:51 +00005541 if (Kind == CK_BitCast)
John McCallb7f4ffe2010-08-12 21:44:57 +00005542 CheckCastAlign(castExpr, castType, TyR);
5543
John Wiegley429bb272011-04-08 18:41:53 +00005544 return Owned(castExpr);
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00005545}
5546
Anders Carlssonc3516322009-10-16 02:48:28 +00005547bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty,
John McCall2de56d12010-08-25 11:45:40 +00005548 CastKind &Kind) {
Anders Carlssona64db8f2007-11-27 05:51:55 +00005549 assert(VectorTy->isVectorType() && "Not a vector type!");
Mike Stumpeed9cac2009-02-19 03:04:26 +00005550
Anders Carlssona64db8f2007-11-27 05:51:55 +00005551 if (Ty->isVectorType() || Ty->isIntegerType()) {
Chris Lattner98be4942008-03-05 18:54:05 +00005552 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty))
Anders Carlssona64db8f2007-11-27 05:51:55 +00005553 return Diag(R.getBegin(),
Mike Stumpeed9cac2009-02-19 03:04:26 +00005554 Ty->isVectorType() ?
Anders Carlssona64db8f2007-11-27 05:51:55 +00005555 diag::err_invalid_conversion_between_vectors :
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00005556 diag::err_invalid_conversion_between_vector_and_integer)
Chris Lattnerd1625842008-11-24 06:25:27 +00005557 << VectorTy << Ty << R;
Anders Carlssona64db8f2007-11-27 05:51:55 +00005558 } else
5559 return Diag(R.getBegin(),
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00005560 diag::err_invalid_conversion_between_vector_and_scalar)
Chris Lattnerd1625842008-11-24 06:25:27 +00005561 << VectorTy << Ty << R;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005562
John McCall2de56d12010-08-25 11:45:40 +00005563 Kind = CK_BitCast;
Anders Carlssona64db8f2007-11-27 05:51:55 +00005564 return false;
5565}
5566
John Wiegley429bb272011-04-08 18:41:53 +00005567ExprResult Sema::CheckExtVectorCast(SourceRange R, QualType DestTy,
5568 Expr *CastExpr, CastKind &Kind) {
Nate Begeman58d29a42009-06-26 00:50:28 +00005569 assert(DestTy->isExtVectorType() && "Not an extended vector type!");
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005570
Anders Carlsson16a89042009-10-16 05:23:41 +00005571 QualType SrcTy = CastExpr->getType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005572
Nate Begeman9b10da62009-06-27 22:05:55 +00005573 // If SrcTy is a VectorType, the total size must match to explicitly cast to
5574 // an ExtVectorType.
Nate Begeman58d29a42009-06-26 00:50:28 +00005575 if (SrcTy->isVectorType()) {
John Wiegley429bb272011-04-08 18:41:53 +00005576 if (Context.getTypeSize(DestTy) != Context.getTypeSize(SrcTy)) {
5577 Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors)
Nate Begeman58d29a42009-06-26 00:50:28 +00005578 << DestTy << SrcTy << R;
John Wiegley429bb272011-04-08 18:41:53 +00005579 return ExprError();
5580 }
John McCall2de56d12010-08-25 11:45:40 +00005581 Kind = CK_BitCast;
John Wiegley429bb272011-04-08 18:41:53 +00005582 return Owned(CastExpr);
Nate Begeman58d29a42009-06-26 00:50:28 +00005583 }
5584
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005585 // All non-pointer scalars can be cast to ExtVector type. The appropriate
Nate Begeman58d29a42009-06-26 00:50:28 +00005586 // conversion will take place first from scalar to elt type, and then
5587 // splat from elt type to vector.
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005588 if (SrcTy->isPointerType())
5589 return Diag(R.getBegin(),
5590 diag::err_invalid_conversion_between_vector_and_scalar)
5591 << DestTy << SrcTy << R;
Eli Friedman73c39ab2009-10-20 08:27:19 +00005592
5593 QualType DestElemTy = DestTy->getAs<ExtVectorType>()->getElementType();
John Wiegley429bb272011-04-08 18:41:53 +00005594 ExprResult CastExprRes = Owned(CastExpr);
5595 CastKind CK = PrepareScalarCast(*this, CastExprRes, DestElemTy);
5596 if (CastExprRes.isInvalid())
5597 return ExprError();
5598 CastExpr = ImpCastExprToType(CastExprRes.take(), DestElemTy, CK).take();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005599
John McCall2de56d12010-08-25 11:45:40 +00005600 Kind = CK_VectorSplat;
John Wiegley429bb272011-04-08 18:41:53 +00005601 return Owned(CastExpr);
Nate Begeman58d29a42009-06-26 00:50:28 +00005602}
5603
John McCall60d7b3a2010-08-24 06:29:42 +00005604ExprResult
John McCallb3d87482010-08-24 05:47:05 +00005605Sema::ActOnCastExpr(Scope *S, SourceLocation LParenLoc, ParsedType Ty,
John McCall9ae2f072010-08-23 23:25:46 +00005606 SourceLocation RParenLoc, Expr *castExpr) {
5607 assert((Ty != 0) && (castExpr != 0) &&
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005608 "ActOnCastExpr(): missing type or expr");
Steve Naroff16beff82007-07-16 23:25:18 +00005609
John McCall9d125032010-01-15 18:39:57 +00005610 TypeSourceInfo *castTInfo;
5611 QualType castType = GetTypeFromParser(Ty, &castTInfo);
5612 if (!castTInfo)
John McCall42f56b52010-01-18 19:35:47 +00005613 castTInfo = Context.getTrivialTypeSourceInfo(castType);
Mike Stump1eb44332009-09-09 15:08:12 +00005614
Nate Begeman2ef13e52009-08-10 23:49:36 +00005615 // If the Expr being casted is a ParenListExpr, handle it specially.
5616 if (isa<ParenListExpr>(castExpr))
John McCall9ae2f072010-08-23 23:25:46 +00005617 return ActOnCastOfParenListExpr(S, LParenLoc, RParenLoc, castExpr,
John McCall42f56b52010-01-18 19:35:47 +00005618 castTInfo);
John McCallb042fdf2010-01-15 18:56:44 +00005619
John McCall9ae2f072010-08-23 23:25:46 +00005620 return BuildCStyleCastExpr(LParenLoc, castTInfo, RParenLoc, castExpr);
John McCallb042fdf2010-01-15 18:56:44 +00005621}
5622
John McCall60d7b3a2010-08-24 06:29:42 +00005623ExprResult
John McCallb042fdf2010-01-15 18:56:44 +00005624Sema::BuildCStyleCastExpr(SourceLocation LParenLoc, TypeSourceInfo *Ty,
John McCall9ae2f072010-08-23 23:25:46 +00005625 SourceLocation RParenLoc, Expr *castExpr) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005626 CastKind Kind = CK_Invalid;
John McCallf89e55a2010-11-18 06:31:45 +00005627 ExprValueKind VK = VK_RValue;
John McCallf871d0c2010-08-07 06:22:56 +00005628 CXXCastPath BasePath;
John Wiegley429bb272011-04-08 18:41:53 +00005629 ExprResult CastResult =
5630 CheckCastTypes(SourceRange(LParenLoc, RParenLoc), Ty->getType(), castExpr,
5631 Kind, VK, BasePath);
5632 if (CastResult.isInvalid())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005633 return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00005634 castExpr = CastResult.take();
Anders Carlsson0aebc812009-09-09 21:33:21 +00005635
John McCallf871d0c2010-08-07 06:22:56 +00005636 return Owned(CStyleCastExpr::Create(Context,
John Wiegley429bb272011-04-08 18:41:53 +00005637 Ty->getType().getNonLValueExprType(Context),
John McCallf89e55a2010-11-18 06:31:45 +00005638 VK, Kind, castExpr, &BasePath, Ty,
John McCallf871d0c2010-08-07 06:22:56 +00005639 LParenLoc, RParenLoc));
Reid Spencer5f016e22007-07-11 17:01:13 +00005640}
5641
Nate Begeman2ef13e52009-08-10 23:49:36 +00005642/// This is not an AltiVec-style cast, so turn the ParenListExpr into a sequence
5643/// of comma binary operators.
John McCall60d7b3a2010-08-24 06:29:42 +00005644ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00005645Sema::MaybeConvertParenListExprToParenExpr(Scope *S, Expr *expr) {
Nate Begeman2ef13e52009-08-10 23:49:36 +00005646 ParenListExpr *E = dyn_cast<ParenListExpr>(expr);
5647 if (!E)
5648 return Owned(expr);
Mike Stump1eb44332009-09-09 15:08:12 +00005649
John McCall60d7b3a2010-08-24 06:29:42 +00005650 ExprResult Result(E->getExpr(0));
Mike Stump1eb44332009-09-09 15:08:12 +00005651
Nate Begeman2ef13e52009-08-10 23:49:36 +00005652 for (unsigned i = 1, e = E->getNumExprs(); i != e && !Result.isInvalid(); ++i)
John McCall9ae2f072010-08-23 23:25:46 +00005653 Result = ActOnBinOp(S, E->getExprLoc(), tok::comma, Result.get(),
5654 E->getExpr(i));
Mike Stump1eb44332009-09-09 15:08:12 +00005655
John McCall9ae2f072010-08-23 23:25:46 +00005656 if (Result.isInvalid()) return ExprError();
5657
5658 return ActOnParenExpr(E->getLParenLoc(), E->getRParenLoc(), Result.get());
Nate Begeman2ef13e52009-08-10 23:49:36 +00005659}
5660
John McCall60d7b3a2010-08-24 06:29:42 +00005661ExprResult
Nate Begeman2ef13e52009-08-10 23:49:36 +00005662Sema::ActOnCastOfParenListExpr(Scope *S, SourceLocation LParenLoc,
John McCall9ae2f072010-08-23 23:25:46 +00005663 SourceLocation RParenLoc, Expr *Op,
John McCall42f56b52010-01-18 19:35:47 +00005664 TypeSourceInfo *TInfo) {
John McCall9ae2f072010-08-23 23:25:46 +00005665 ParenListExpr *PE = cast<ParenListExpr>(Op);
John McCall42f56b52010-01-18 19:35:47 +00005666 QualType Ty = TInfo->getType();
Anton Yartsevd06fea82011-03-27 09:32:40 +00005667 bool isVectorLiteral = false;
Mike Stump1eb44332009-09-09 15:08:12 +00005668
Anton Yartsevd06fea82011-03-27 09:32:40 +00005669 // Check for an altivec or OpenCL literal,
John Thompson8bb59a82010-06-30 22:55:51 +00005670 // i.e. all the elements are integer constants.
Nate Begeman2ef13e52009-08-10 23:49:36 +00005671 if (getLangOptions().AltiVec && Ty->isVectorType()) {
5672 if (PE->getNumExprs() == 0) {
5673 Diag(PE->getExprLoc(), diag::err_altivec_empty_initializer);
5674 return ExprError();
5675 }
John Thompson8bb59a82010-06-30 22:55:51 +00005676 if (PE->getNumExprs() == 1) {
5677 if (!PE->getExpr(0)->getType()->isVectorType())
Anton Yartsevd06fea82011-03-27 09:32:40 +00005678 isVectorLiteral = true;
John Thompson8bb59a82010-06-30 22:55:51 +00005679 }
5680 else
Anton Yartsevd06fea82011-03-27 09:32:40 +00005681 isVectorLiteral = true;
John Thompson8bb59a82010-06-30 22:55:51 +00005682 }
Nate Begeman2ef13e52009-08-10 23:49:36 +00005683
Anton Yartsevd06fea82011-03-27 09:32:40 +00005684 // If this is a vector initializer, '(' type ')' '(' init, ..., init ')'
John Thompson8bb59a82010-06-30 22:55:51 +00005685 // then handle it as such.
Anton Yartsevd06fea82011-03-27 09:32:40 +00005686 if (isVectorLiteral) {
Nate Begeman2ef13e52009-08-10 23:49:36 +00005687 llvm::SmallVector<Expr *, 8> initExprs;
Anton Yartsevd06fea82011-03-27 09:32:40 +00005688 // '(...)' form of vector initialization in AltiVec: the number of
5689 // initializers must be one or must match the size of the vector.
5690 // If a single value is specified in the initializer then it will be
5691 // replicated to all the components of the vector
5692 if (Ty->getAs<VectorType>()->getVectorKind() ==
5693 VectorType::AltiVecVector) {
5694 unsigned numElems = Ty->getAs<VectorType>()->getNumElements();
5695 // The number of initializers must be one or must match the size of the
5696 // vector. If a single value is specified in the initializer then it will
5697 // be replicated to all the components of the vector
5698 if (PE->getNumExprs() == 1) {
5699 QualType ElemTy = Ty->getAs<VectorType>()->getElementType();
John Wiegley429bb272011-04-08 18:41:53 +00005700 ExprResult Literal = Owned(PE->getExpr(0));
5701 Literal = ImpCastExprToType(Literal.take(), ElemTy,
5702 PrepareScalarCast(*this, Literal, ElemTy));
5703 return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Literal.take());
Anton Yartsevd06fea82011-03-27 09:32:40 +00005704 }
5705 else if (PE->getNumExprs() < numElems) {
5706 Diag(PE->getExprLoc(),
5707 diag::err_incorrect_number_of_vector_initializers);
5708 return ExprError();
5709 }
5710 else
5711 for (unsigned i = 0, e = PE->getNumExprs(); i != e; ++i)
5712 initExprs.push_back(PE->getExpr(i));
5713 }
5714 else
5715 for (unsigned i = 0, e = PE->getNumExprs(); i != e; ++i)
5716 initExprs.push_back(PE->getExpr(i));
Nate Begeman2ef13e52009-08-10 23:49:36 +00005717
5718 // FIXME: This means that pretty-printing the final AST will produce curly
5719 // braces instead of the original commas.
Ted Kremenek709210f2010-04-13 23:39:13 +00005720 InitListExpr *E = new (Context) InitListExpr(Context, LParenLoc,
5721 &initExprs[0],
Nate Begeman2ef13e52009-08-10 23:49:36 +00005722 initExprs.size(), RParenLoc);
5723 E->setType(Ty);
John McCall9ae2f072010-08-23 23:25:46 +00005724 return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, E);
Nate Begeman2ef13e52009-08-10 23:49:36 +00005725 } else {
Mike Stump1eb44332009-09-09 15:08:12 +00005726 // This is not an AltiVec-style cast, so turn the ParenListExpr into a
Nate Begeman2ef13e52009-08-10 23:49:36 +00005727 // sequence of BinOp comma operators.
John McCall60d7b3a2010-08-24 06:29:42 +00005728 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Op);
John McCall9ae2f072010-08-23 23:25:46 +00005729 if (Result.isInvalid()) return ExprError();
5730 return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Result.take());
Nate Begeman2ef13e52009-08-10 23:49:36 +00005731 }
5732}
5733
John McCall60d7b3a2010-08-24 06:29:42 +00005734ExprResult Sema::ActOnParenOrParenListExpr(SourceLocation L,
Nate Begeman2ef13e52009-08-10 23:49:36 +00005735 SourceLocation R,
Fariborz Jahanianf88f7ab2009-11-25 01:26:41 +00005736 MultiExprArg Val,
John McCallb3d87482010-08-24 05:47:05 +00005737 ParsedType TypeOfCast) {
Nate Begeman2ef13e52009-08-10 23:49:36 +00005738 unsigned nexprs = Val.size();
5739 Expr **exprs = reinterpret_cast<Expr**>(Val.release());
Fariborz Jahanianf88f7ab2009-11-25 01:26:41 +00005740 assert((exprs != 0) && "ActOnParenOrParenListExpr() missing expr list");
5741 Expr *expr;
5742 if (nexprs == 1 && TypeOfCast && !TypeIsVectorType(TypeOfCast))
5743 expr = new (Context) ParenExpr(L, R, exprs[0]);
5744 else
5745 expr = new (Context) ParenListExpr(Context, L, exprs, nexprs, R);
Nate Begeman2ef13e52009-08-10 23:49:36 +00005746 return Owned(expr);
5747}
5748
Chandler Carruth82214a82011-02-18 23:54:50 +00005749/// \brief Emit a specialized diagnostic when one expression is a null pointer
5750/// constant and the other is not a pointer.
5751bool Sema::DiagnoseConditionalForNull(Expr *LHS, Expr *RHS,
5752 SourceLocation QuestionLoc) {
5753 Expr *NullExpr = LHS;
5754 Expr *NonPointerExpr = RHS;
5755 Expr::NullPointerConstantKind NullKind =
5756 NullExpr->isNullPointerConstant(Context,
5757 Expr::NPC_ValueDependentIsNotNull);
5758
5759 if (NullKind == Expr::NPCK_NotNull) {
5760 NullExpr = RHS;
5761 NonPointerExpr = LHS;
5762 NullKind =
5763 NullExpr->isNullPointerConstant(Context,
5764 Expr::NPC_ValueDependentIsNotNull);
5765 }
5766
5767 if (NullKind == Expr::NPCK_NotNull)
5768 return false;
5769
5770 if (NullKind == Expr::NPCK_ZeroInteger) {
5771 // In this case, check to make sure that we got here from a "NULL"
5772 // string in the source code.
5773 NullExpr = NullExpr->IgnoreParenImpCasts();
John McCall834e3f62011-03-08 07:59:04 +00005774 SourceLocation loc = NullExpr->getExprLoc();
5775 if (!findMacroSpelling(loc, "NULL"))
Chandler Carruth82214a82011-02-18 23:54:50 +00005776 return false;
5777 }
5778
5779 int DiagType = (NullKind == Expr::NPCK_CXX0X_nullptr);
5780 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands_null)
5781 << NonPointerExpr->getType() << DiagType
5782 << NonPointerExpr->getSourceRange();
5783 return true;
5784}
5785
Sebastian Redl28507842009-02-26 14:39:58 +00005786/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension.
5787/// In that case, lhs = cond.
Chris Lattnera119a3b2009-02-18 04:38:20 +00005788/// C99 6.5.15
John Wiegley429bb272011-04-08 18:41:53 +00005789QualType Sema::CheckConditionalOperands(ExprResult &Cond, ExprResult &LHS, ExprResult &RHS,
John McCall56ca35d2011-02-17 10:25:35 +00005790 ExprValueKind &VK, ExprObjectKind &OK,
Chris Lattnera119a3b2009-02-18 04:38:20 +00005791 SourceLocation QuestionLoc) {
Douglas Gregorfadb53b2011-03-12 01:48:56 +00005792
John McCallfb8721c2011-04-10 19:13:55 +00005793 ExprResult lhsResult = CheckPlaceholderExpr(LHS.get());
John McCall1de4d4e2011-04-07 08:22:57 +00005794 if (!lhsResult.isUsable()) return QualType();
John Wiegley429bb272011-04-08 18:41:53 +00005795 LHS = move(lhsResult);
Douglas Gregor7ad5d422010-11-09 21:07:58 +00005796
John McCallfb8721c2011-04-10 19:13:55 +00005797 ExprResult rhsResult = CheckPlaceholderExpr(RHS.get());
John McCall1de4d4e2011-04-07 08:22:57 +00005798 if (!rhsResult.isUsable()) return QualType();
John Wiegley429bb272011-04-08 18:41:53 +00005799 RHS = move(rhsResult);
Douglas Gregor7ad5d422010-11-09 21:07:58 +00005800
Sebastian Redl3201f6b2009-04-16 17:51:27 +00005801 // C++ is sufficiently different to merit its own checker.
5802 if (getLangOptions().CPlusPlus)
John McCall56ca35d2011-02-17 10:25:35 +00005803 return CXXCheckConditionalOperands(Cond, LHS, RHS, VK, OK, QuestionLoc);
John McCallf89e55a2010-11-18 06:31:45 +00005804
5805 VK = VK_RValue;
John McCall09431682010-11-18 19:01:18 +00005806 OK = OK_Ordinary;
Sebastian Redl3201f6b2009-04-16 17:51:27 +00005807
John Wiegley429bb272011-04-08 18:41:53 +00005808 Cond = UsualUnaryConversions(Cond.take());
5809 if (Cond.isInvalid())
5810 return QualType();
5811 LHS = UsualUnaryConversions(LHS.take());
5812 if (LHS.isInvalid())
5813 return QualType();
5814 RHS = UsualUnaryConversions(RHS.take());
5815 if (RHS.isInvalid())
5816 return QualType();
5817
5818 QualType CondTy = Cond.get()->getType();
5819 QualType LHSTy = LHS.get()->getType();
5820 QualType RHSTy = RHS.get()->getType();
Steve Naroffc80b4ee2007-07-16 21:54:35 +00005821
Reid Spencer5f016e22007-07-11 17:01:13 +00005822 // first, check the condition.
Sebastian Redl3201f6b2009-04-16 17:51:27 +00005823 if (!CondTy->isScalarType()) { // C99 6.5.15p2
Nate Begeman6155d732010-09-20 22:41:17 +00005824 // OpenCL: Sec 6.3.i says the condition is allowed to be a vector or scalar.
5825 // Throw an error if its not either.
5826 if (getLangOptions().OpenCL) {
5827 if (!CondTy->isVectorType()) {
John Wiegley429bb272011-04-08 18:41:53 +00005828 Diag(Cond.get()->getLocStart(),
Nate Begeman6155d732010-09-20 22:41:17 +00005829 diag::err_typecheck_cond_expect_scalar_or_vector)
5830 << CondTy;
5831 return QualType();
5832 }
5833 }
5834 else {
John Wiegley429bb272011-04-08 18:41:53 +00005835 Diag(Cond.get()->getLocStart(), diag::err_typecheck_cond_expect_scalar)
Nate Begeman6155d732010-09-20 22:41:17 +00005836 << CondTy;
5837 return QualType();
5838 }
Reid Spencer5f016e22007-07-11 17:01:13 +00005839 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005840
Chris Lattner70d67a92008-01-06 22:42:25 +00005841 // Now check the two expressions.
Nate Begeman2ef13e52009-08-10 23:49:36 +00005842 if (LHSTy->isVectorType() || RHSTy->isVectorType())
5843 return CheckVectorOperands(QuestionLoc, LHS, RHS);
Douglas Gregor898574e2008-12-05 23:32:09 +00005844
Nate Begeman6155d732010-09-20 22:41:17 +00005845 // OpenCL: If the condition is a vector, and both operands are scalar,
5846 // attempt to implicity convert them to the vector type to act like the
5847 // built in select.
5848 if (getLangOptions().OpenCL && CondTy->isVectorType()) {
5849 // Both operands should be of scalar type.
5850 if (!LHSTy->isScalarType()) {
John Wiegley429bb272011-04-08 18:41:53 +00005851 Diag(LHS.get()->getLocStart(), diag::err_typecheck_cond_expect_scalar)
Nate Begeman6155d732010-09-20 22:41:17 +00005852 << CondTy;
5853 return QualType();
5854 }
5855 if (!RHSTy->isScalarType()) {
John Wiegley429bb272011-04-08 18:41:53 +00005856 Diag(RHS.get()->getLocStart(), diag::err_typecheck_cond_expect_scalar)
Nate Begeman6155d732010-09-20 22:41:17 +00005857 << CondTy;
5858 return QualType();
5859 }
5860 // Implicity convert these scalars to the type of the condition.
John Wiegley429bb272011-04-08 18:41:53 +00005861 LHS = ImpCastExprToType(LHS.take(), CondTy, CK_IntegralCast);
5862 RHS = ImpCastExprToType(RHS.take(), CondTy, CK_IntegralCast);
Nate Begeman6155d732010-09-20 22:41:17 +00005863 }
5864
Chris Lattner70d67a92008-01-06 22:42:25 +00005865 // If both operands have arithmetic type, do the usual arithmetic conversions
5866 // to find a common type: C99 6.5.15p3,5.
Chris Lattnerefdc39d2009-02-18 04:28:32 +00005867 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) {
5868 UsualArithmeticConversions(LHS, RHS);
John Wiegley429bb272011-04-08 18:41:53 +00005869 if (LHS.isInvalid() || RHS.isInvalid())
5870 return QualType();
5871 return LHS.get()->getType();
Steve Naroffa4332e22007-07-17 00:58:39 +00005872 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005873
Chris Lattner70d67a92008-01-06 22:42:25 +00005874 // If both operands are the same structure or union type, the result is that
5875 // type.
Ted Kremenek6217b802009-07-29 21:53:49 +00005876 if (const RecordType *LHSRT = LHSTy->getAs<RecordType>()) { // C99 6.5.15p3
5877 if (const RecordType *RHSRT = RHSTy->getAs<RecordType>())
Chris Lattnera21ddb32007-11-26 01:40:58 +00005878 if (LHSRT->getDecl() == RHSRT->getDecl())
Mike Stumpeed9cac2009-02-19 03:04:26 +00005879 // "If both the operands have structure or union type, the result has
Chris Lattner70d67a92008-01-06 22:42:25 +00005880 // that type." This implies that CV qualifiers are dropped.
Chris Lattnerefdc39d2009-02-18 04:28:32 +00005881 return LHSTy.getUnqualifiedType();
Eli Friedmanb1d796d2009-03-23 00:24:07 +00005882 // FIXME: Type of conditional expression must be complete in C mode.
Reid Spencer5f016e22007-07-11 17:01:13 +00005883 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005884
Chris Lattner70d67a92008-01-06 22:42:25 +00005885 // C99 6.5.15p5: "If both operands have void type, the result has void type."
Steve Naroffe701c0a2008-05-12 21:44:38 +00005886 // The following || allows only one side to be void (a GCC-ism).
Chris Lattnerefdc39d2009-02-18 04:28:32 +00005887 if (LHSTy->isVoidType() || RHSTy->isVoidType()) {
5888 if (!LHSTy->isVoidType())
John Wiegley429bb272011-04-08 18:41:53 +00005889 Diag(RHS.get()->getLocStart(), diag::ext_typecheck_cond_one_void)
5890 << RHS.get()->getSourceRange();
Chris Lattnerefdc39d2009-02-18 04:28:32 +00005891 if (!RHSTy->isVoidType())
John Wiegley429bb272011-04-08 18:41:53 +00005892 Diag(LHS.get()->getLocStart(), diag::ext_typecheck_cond_one_void)
5893 << LHS.get()->getSourceRange();
5894 LHS = ImpCastExprToType(LHS.take(), Context.VoidTy, CK_ToVoid);
5895 RHS = ImpCastExprToType(RHS.take(), Context.VoidTy, CK_ToVoid);
Eli Friedman0e724012008-06-04 19:47:51 +00005896 return Context.VoidTy;
Steve Naroffe701c0a2008-05-12 21:44:38 +00005897 }
Steve Naroffb6d54e52008-01-08 01:11:38 +00005898 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has
5899 // the type of the other operand."
Steve Naroff58f9f2c2009-07-14 18:25:06 +00005900 if ((LHSTy->isAnyPointerType() || LHSTy->isBlockPointerType()) &&
John Wiegley429bb272011-04-08 18:41:53 +00005901 RHS.get()->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
Eli Friedman73c39ab2009-10-20 08:27:19 +00005902 // promote the null to a pointer.
John Wiegley429bb272011-04-08 18:41:53 +00005903 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_NullToPointer);
Chris Lattnerefdc39d2009-02-18 04:28:32 +00005904 return LHSTy;
Steve Naroffb6d54e52008-01-08 01:11:38 +00005905 }
Steve Naroff58f9f2c2009-07-14 18:25:06 +00005906 if ((RHSTy->isAnyPointerType() || RHSTy->isBlockPointerType()) &&
John Wiegley429bb272011-04-08 18:41:53 +00005907 LHS.get()->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
5908 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_NullToPointer);
Chris Lattnerefdc39d2009-02-18 04:28:32 +00005909 return RHSTy;
Steve Naroffb6d54e52008-01-08 01:11:38 +00005910 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005911
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005912 // All objective-c pointer type analysis is done here.
5913 QualType compositeType = FindCompositeObjCPointerType(LHS, RHS,
5914 QuestionLoc);
John Wiegley429bb272011-04-08 18:41:53 +00005915 if (LHS.isInvalid() || RHS.isInvalid())
5916 return QualType();
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005917 if (!compositeType.isNull())
5918 return compositeType;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005919
5920
Steve Naroff7154a772009-07-01 14:36:47 +00005921 // Handle block pointer types.
5922 if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType()) {
5923 if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) {
5924 if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) {
5925 QualType destType = Context.getPointerType(Context.VoidTy);
John Wiegley429bb272011-04-08 18:41:53 +00005926 LHS = ImpCastExprToType(LHS.take(), destType, CK_BitCast);
5927 RHS = ImpCastExprToType(RHS.take(), destType, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00005928 return destType;
5929 }
5930 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
John Wiegley429bb272011-04-08 18:41:53 +00005931 << LHSTy << RHSTy << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Steve Naroff7154a772009-07-01 14:36:47 +00005932 return QualType();
Mike Stumpdd3e1662009-05-07 03:14:14 +00005933 }
Steve Naroff7154a772009-07-01 14:36:47 +00005934 // We have 2 block pointer types.
5935 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
5936 // Two identical block pointer types are always compatible.
Mike Stumpdd3e1662009-05-07 03:14:14 +00005937 return LHSTy;
5938 }
Steve Naroff7154a772009-07-01 14:36:47 +00005939 // The block pointer types aren't identical, continue checking.
Ted Kremenek6217b802009-07-29 21:53:49 +00005940 QualType lhptee = LHSTy->getAs<BlockPointerType>()->getPointeeType();
5941 QualType rhptee = RHSTy->getAs<BlockPointerType>()->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005942
Steve Naroff7154a772009-07-01 14:36:47 +00005943 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(),
5944 rhptee.getUnqualifiedType())) {
Mike Stumpdd3e1662009-05-07 03:14:14 +00005945 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers)
John Wiegley429bb272011-04-08 18:41:53 +00005946 << LHSTy << RHSTy << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Mike Stumpdd3e1662009-05-07 03:14:14 +00005947 // In this situation, we assume void* type. No especially good
5948 // reason, but this is what gcc does, and we do have to pick
5949 // to get a consistent AST.
5950 QualType incompatTy = Context.getPointerType(Context.VoidTy);
John Wiegley429bb272011-04-08 18:41:53 +00005951 LHS = ImpCastExprToType(LHS.take(), incompatTy, CK_BitCast);
5952 RHS = ImpCastExprToType(RHS.take(), incompatTy, CK_BitCast);
Mike Stumpdd3e1662009-05-07 03:14:14 +00005953 return incompatTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00005954 }
Steve Naroff7154a772009-07-01 14:36:47 +00005955 // The block pointer types are compatible.
John Wiegley429bb272011-04-08 18:41:53 +00005956 LHS = ImpCastExprToType(LHS.take(), LHSTy, CK_BitCast);
5957 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
Steve Naroff91588042009-04-08 17:05:15 +00005958 return LHSTy;
5959 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005960
Steve Naroff7154a772009-07-01 14:36:47 +00005961 // Check constraints for C object pointers types (C99 6.5.15p3,6).
5962 if (LHSTy->isPointerType() && RHSTy->isPointerType()) {
5963 // get the "pointed to" types
Ted Kremenek6217b802009-07-29 21:53:49 +00005964 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
5965 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
Steve Naroff7154a772009-07-01 14:36:47 +00005966
5967 // ignore qualifiers on void (C99 6.5.15p3, clause 6)
5968 if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) {
5969 // Figure out necessary qualifiers (C99 6.5.15p6)
John McCall0953e762009-09-24 19:53:00 +00005970 QualType destPointee
5971 = Context.getQualifiedType(lhptee, rhptee.getQualifiers());
Steve Naroff7154a772009-07-01 14:36:47 +00005972 QualType destType = Context.getPointerType(destPointee);
Eli Friedman73c39ab2009-10-20 08:27:19 +00005973 // Add qualifiers if necessary.
John Wiegley429bb272011-04-08 18:41:53 +00005974 LHS = ImpCastExprToType(LHS.take(), destType, CK_NoOp);
Eli Friedman73c39ab2009-10-20 08:27:19 +00005975 // Promote to void*.
John Wiegley429bb272011-04-08 18:41:53 +00005976 RHS = ImpCastExprToType(RHS.take(), destType, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00005977 return destType;
5978 }
5979 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) {
John McCall0953e762009-09-24 19:53:00 +00005980 QualType destPointee
5981 = Context.getQualifiedType(rhptee, lhptee.getQualifiers());
Steve Naroff7154a772009-07-01 14:36:47 +00005982 QualType destType = Context.getPointerType(destPointee);
Eli Friedman73c39ab2009-10-20 08:27:19 +00005983 // Add qualifiers if necessary.
John Wiegley429bb272011-04-08 18:41:53 +00005984 RHS = ImpCastExprToType(RHS.take(), destType, CK_NoOp);
Eli Friedman73c39ab2009-10-20 08:27:19 +00005985 // Promote to void*.
John Wiegley429bb272011-04-08 18:41:53 +00005986 LHS = ImpCastExprToType(LHS.take(), destType, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00005987 return destType;
5988 }
5989
5990 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
5991 // Two identical pointer types are always compatible.
5992 return LHSTy;
5993 }
5994 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(),
5995 rhptee.getUnqualifiedType())) {
5996 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers)
John Wiegley429bb272011-04-08 18:41:53 +00005997 << LHSTy << RHSTy << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Steve Naroff7154a772009-07-01 14:36:47 +00005998 // In this situation, we assume void* type. No especially good
5999 // reason, but this is what gcc does, and we do have to pick
6000 // to get a consistent AST.
6001 QualType incompatTy = Context.getPointerType(Context.VoidTy);
John Wiegley429bb272011-04-08 18:41:53 +00006002 LHS = ImpCastExprToType(LHS.take(), incompatTy, CK_BitCast);
6003 RHS = ImpCastExprToType(RHS.take(), incompatTy, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00006004 return incompatTy;
6005 }
6006 // The pointer types are compatible.
6007 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to
6008 // differently qualified versions of compatible types, the result type is
6009 // a pointer to an appropriately qualified version of the *composite*
6010 // type.
6011 // FIXME: Need to calculate the composite type.
6012 // FIXME: Need to add qualifiers
John Wiegley429bb272011-04-08 18:41:53 +00006013 LHS = ImpCastExprToType(LHS.take(), LHSTy, CK_BitCast);
6014 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00006015 return LHSTy;
6016 }
Mike Stump1eb44332009-09-09 15:08:12 +00006017
John McCall404cd162010-11-13 01:35:44 +00006018 // GCC compatibility: soften pointer/integer mismatch. Note that
6019 // null pointers have been filtered out by this point.
Steve Naroff7154a772009-07-01 14:36:47 +00006020 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) {
6021 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch)
John Wiegley429bb272011-04-08 18:41:53 +00006022 << LHSTy << RHSTy << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
6023 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_IntegralToPointer);
Steve Naroff7154a772009-07-01 14:36:47 +00006024 return RHSTy;
6025 }
6026 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) {
6027 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch)
John Wiegley429bb272011-04-08 18:41:53 +00006028 << LHSTy << RHSTy << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
6029 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_IntegralToPointer);
Steve Naroff7154a772009-07-01 14:36:47 +00006030 return LHSTy;
6031 }
Daniel Dunbar5e155f02008-09-11 23:12:46 +00006032
Chandler Carruth82214a82011-02-18 23:54:50 +00006033 // Emit a better diagnostic if one of the expressions is a null pointer
6034 // constant and the other is not a pointer type. In this case, the user most
6035 // likely forgot to take the address of the other expression.
John Wiegley429bb272011-04-08 18:41:53 +00006036 if (DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
Chandler Carruth82214a82011-02-18 23:54:50 +00006037 return QualType();
6038
Chris Lattner70d67a92008-01-06 22:42:25 +00006039 // Otherwise, the operands are not compatible.
Chris Lattnerefdc39d2009-02-18 04:28:32 +00006040 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
John Wiegley429bb272011-04-08 18:41:53 +00006041 << LHSTy << RHSTy << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00006042 return QualType();
6043}
6044
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006045/// FindCompositeObjCPointerType - Helper method to find composite type of
6046/// two objective-c pointer types of the two input expressions.
John Wiegley429bb272011-04-08 18:41:53 +00006047QualType Sema::FindCompositeObjCPointerType(ExprResult &LHS, ExprResult &RHS,
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006048 SourceLocation QuestionLoc) {
John Wiegley429bb272011-04-08 18:41:53 +00006049 QualType LHSTy = LHS.get()->getType();
6050 QualType RHSTy = RHS.get()->getType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006051
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006052 // Handle things like Class and struct objc_class*. Here we case the result
6053 // to the pseudo-builtin, because that will be implicitly cast back to the
6054 // redefinition type if an attempt is made to access its fields.
6055 if (LHSTy->isObjCClassType() &&
John McCall49f4e1c2010-12-10 11:01:00 +00006056 (Context.hasSameType(RHSTy, Context.ObjCClassRedefinitionType))) {
John Wiegley429bb272011-04-08 18:41:53 +00006057 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006058 return LHSTy;
6059 }
6060 if (RHSTy->isObjCClassType() &&
John McCall49f4e1c2010-12-10 11:01:00 +00006061 (Context.hasSameType(LHSTy, Context.ObjCClassRedefinitionType))) {
John Wiegley429bb272011-04-08 18:41:53 +00006062 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006063 return RHSTy;
6064 }
6065 // And the same for struct objc_object* / id
6066 if (LHSTy->isObjCIdType() &&
John McCall49f4e1c2010-12-10 11:01:00 +00006067 (Context.hasSameType(RHSTy, Context.ObjCIdRedefinitionType))) {
John Wiegley429bb272011-04-08 18:41:53 +00006068 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006069 return LHSTy;
6070 }
6071 if (RHSTy->isObjCIdType() &&
John McCall49f4e1c2010-12-10 11:01:00 +00006072 (Context.hasSameType(LHSTy, Context.ObjCIdRedefinitionType))) {
John Wiegley429bb272011-04-08 18:41:53 +00006073 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006074 return RHSTy;
6075 }
6076 // And the same for struct objc_selector* / SEL
6077 if (Context.isObjCSelType(LHSTy) &&
John McCall49f4e1c2010-12-10 11:01:00 +00006078 (Context.hasSameType(RHSTy, Context.ObjCSelRedefinitionType))) {
John Wiegley429bb272011-04-08 18:41:53 +00006079 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006080 return LHSTy;
6081 }
6082 if (Context.isObjCSelType(RHSTy) &&
John McCall49f4e1c2010-12-10 11:01:00 +00006083 (Context.hasSameType(LHSTy, Context.ObjCSelRedefinitionType))) {
John Wiegley429bb272011-04-08 18:41:53 +00006084 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006085 return RHSTy;
6086 }
6087 // Check constraints for Objective-C object pointers types.
6088 if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006089
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006090 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
6091 // Two identical object pointer types are always compatible.
6092 return LHSTy;
6093 }
6094 const ObjCObjectPointerType *LHSOPT = LHSTy->getAs<ObjCObjectPointerType>();
6095 const ObjCObjectPointerType *RHSOPT = RHSTy->getAs<ObjCObjectPointerType>();
6096 QualType compositeType = LHSTy;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006097
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006098 // If both operands are interfaces and either operand can be
6099 // assigned to the other, use that type as the composite
6100 // type. This allows
6101 // xxx ? (A*) a : (B*) b
6102 // where B is a subclass of A.
6103 //
6104 // Additionally, as for assignment, if either type is 'id'
6105 // allow silent coercion. Finally, if the types are
6106 // incompatible then make sure to use 'id' as the composite
6107 // type so the result is acceptable for sending messages to.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006108
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006109 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'.
6110 // It could return the composite type.
6111 if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) {
6112 compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy;
6113 } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) {
6114 compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy;
6115 } else if ((LHSTy->isObjCQualifiedIdType() ||
6116 RHSTy->isObjCQualifiedIdType()) &&
6117 Context.ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true)) {
6118 // Need to handle "id<xx>" explicitly.
6119 // GCC allows qualified id and any Objective-C type to devolve to
6120 // id. Currently localizing to here until clear this should be
6121 // part of ObjCQualifiedIdTypesAreCompatible.
6122 compositeType = Context.getObjCIdType();
6123 } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) {
6124 compositeType = Context.getObjCIdType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006125 } else if (!(compositeType =
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006126 Context.areCommonBaseCompatible(LHSOPT, RHSOPT)).isNull())
6127 ;
6128 else {
6129 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands)
6130 << LHSTy << RHSTy
John Wiegley429bb272011-04-08 18:41:53 +00006131 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006132 QualType incompatTy = Context.getObjCIdType();
John Wiegley429bb272011-04-08 18:41:53 +00006133 LHS = ImpCastExprToType(LHS.take(), incompatTy, CK_BitCast);
6134 RHS = ImpCastExprToType(RHS.take(), incompatTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006135 return incompatTy;
6136 }
6137 // The object pointer types are compatible.
John Wiegley429bb272011-04-08 18:41:53 +00006138 LHS = ImpCastExprToType(LHS.take(), compositeType, CK_BitCast);
6139 RHS = ImpCastExprToType(RHS.take(), compositeType, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006140 return compositeType;
6141 }
6142 // Check Objective-C object pointer types and 'void *'
6143 if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) {
6144 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
6145 QualType rhptee = RHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
6146 QualType destPointee
6147 = Context.getQualifiedType(lhptee, rhptee.getQualifiers());
6148 QualType destType = Context.getPointerType(destPointee);
6149 // Add qualifiers if necessary.
John Wiegley429bb272011-04-08 18:41:53 +00006150 LHS = ImpCastExprToType(LHS.take(), destType, CK_NoOp);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006151 // Promote to void*.
John Wiegley429bb272011-04-08 18:41:53 +00006152 RHS = ImpCastExprToType(RHS.take(), destType, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006153 return destType;
6154 }
6155 if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) {
6156 QualType lhptee = LHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
6157 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
6158 QualType destPointee
6159 = Context.getQualifiedType(rhptee, lhptee.getQualifiers());
6160 QualType destType = Context.getPointerType(destPointee);
6161 // Add qualifiers if necessary.
John Wiegley429bb272011-04-08 18:41:53 +00006162 RHS = ImpCastExprToType(RHS.take(), destType, CK_NoOp);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006163 // Promote to void*.
John Wiegley429bb272011-04-08 18:41:53 +00006164 LHS = ImpCastExprToType(LHS.take(), destType, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00006165 return destType;
6166 }
6167 return QualType();
6168}
6169
Hans Wennborg9cfdae32011-06-03 18:00:36 +00006170/// SuggestParentheses - Emit a diagnostic together with a fixit hint that wraps
6171/// ParenRange in parentheses.
6172static void SuggestParentheses(Sema &Self, SourceLocation Loc,
6173 const PartialDiagnostic &PD,
6174 const PartialDiagnostic &FirstNote,
6175 SourceRange FirstParenRange,
6176 const PartialDiagnostic &SecondNote,
6177 SourceRange SecondParenRange) {
6178 Self.Diag(Loc, PD);
6179
6180 if (!FirstNote.getDiagID())
6181 return;
6182
6183 SourceLocation EndLoc = Self.PP.getLocForEndOfToken(FirstParenRange.getEnd());
6184 if (!FirstParenRange.getEnd().isFileID() || EndLoc.isInvalid()) {
6185 // We can't display the parentheses, so just return.
6186 return;
6187 }
6188
6189 Self.Diag(Loc, FirstNote)
6190 << FixItHint::CreateInsertion(FirstParenRange.getBegin(), "(")
6191 << FixItHint::CreateInsertion(EndLoc, ")");
6192
6193 if (!SecondNote.getDiagID())
6194 return;
6195
6196 EndLoc = Self.PP.getLocForEndOfToken(SecondParenRange.getEnd());
6197 if (!SecondParenRange.getEnd().isFileID() || EndLoc.isInvalid()) {
6198 // We can't display the parentheses, so just dig the
6199 // warning/error and return.
6200 Self.Diag(Loc, SecondNote);
6201 return;
6202 }
6203
6204 Self.Diag(Loc, SecondNote)
6205 << FixItHint::CreateInsertion(SecondParenRange.getBegin(), "(")
6206 << FixItHint::CreateInsertion(EndLoc, ")");
6207}
6208
6209static bool IsArithmeticOp(BinaryOperatorKind Opc) {
6210 return Opc >= BO_Mul && Opc <= BO_Shr;
6211}
6212
6213static bool IsLogicOp(BinaryOperatorKind Opc) {
6214 return (Opc >= BO_LT && Opc <= BO_NE) || (Opc >= BO_LAnd && Opc <= BO_LOr);
6215}
6216
6217/// DiagnoseConditionalPrecedence - Emit a warning when a conditional operator
6218/// and binary operator are mixed in a way that suggests the programmer assumed
6219/// the conditional operator has higher precedence, for example:
6220/// "int x = a + someBinaryCondition ? 1 : 2".
6221static void DiagnoseConditionalPrecedence(Sema &Self,
6222 SourceLocation OpLoc,
6223 Expr *cond,
6224 Expr *lhs,
6225 Expr *rhs) {
6226 while (ImplicitCastExpr *C = dyn_cast<ImplicitCastExpr>(cond))
6227 cond = C->getSubExpr();
6228
6229 if (BinaryOperator *OP = dyn_cast<BinaryOperator>(cond)) {
6230 if (!IsArithmeticOp(OP->getOpcode()))
6231 return;
6232
6233 // Drill down on the RHS of the condition.
6234 Expr *CondRHS = OP->getRHS();
6235 while (ImplicitCastExpr *C = dyn_cast<ImplicitCastExpr>(CondRHS))
6236 CondRHS = C->getSubExpr();
6237 while (ParenExpr *P = dyn_cast<ParenExpr>(CondRHS))
6238 CondRHS = P->getSubExpr();
6239
6240 bool CondRHSLooksBoolean = false;
6241 if (CondRHS->getType()->isBooleanType())
6242 CondRHSLooksBoolean = true;
6243 else if (BinaryOperator *CondRHSOP = dyn_cast<BinaryOperator>(CondRHS))
6244 CondRHSLooksBoolean = IsLogicOp(CondRHSOP->getOpcode());
6245 else if (UnaryOperator *CondRHSOP = dyn_cast<UnaryOperator>(CondRHS))
6246 CondRHSLooksBoolean = CondRHSOP->getOpcode() == UO_LNot;
6247
6248 if (CondRHSLooksBoolean) {
6249 // The condition is an arithmetic binary expression, with a right-
6250 // hand side that looks boolean, so warn.
6251
6252 PartialDiagnostic Warn = Self.PDiag(diag::warn_precedence_conditional)
6253 << OP->getSourceRange()
6254 << BinaryOperator::getOpcodeStr(OP->getOpcode());
6255
6256 PartialDiagnostic FirstNote =
6257 Self.PDiag(diag::note_precedence_conditional_silence)
6258 << BinaryOperator::getOpcodeStr(OP->getOpcode());
6259
6260 SourceRange FirstParenRange(OP->getLHS()->getLocStart(),
6261 OP->getRHS()->getLocEnd());
6262
6263 PartialDiagnostic SecondNote =
6264 Self.PDiag(diag::note_precedence_conditional_first);
6265 SourceRange SecondParenRange(OP->getRHS()->getLocStart(),
6266 rhs->getLocEnd());
6267
6268 SuggestParentheses(Self, OpLoc, Warn, FirstNote, FirstParenRange,
6269 SecondNote, SecondParenRange);
6270 }
6271 }
6272}
6273
Steve Narofff69936d2007-09-16 03:34:24 +00006274/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null
Reid Spencer5f016e22007-07-11 17:01:13 +00006275/// in the case of a the GNU conditional expr extension.
John McCall60d7b3a2010-08-24 06:29:42 +00006276ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc,
John McCall56ca35d2011-02-17 10:25:35 +00006277 SourceLocation ColonLoc,
6278 Expr *CondExpr, Expr *LHSExpr,
6279 Expr *RHSExpr) {
Chris Lattnera21ddb32007-11-26 01:40:58 +00006280 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS
6281 // was the condition.
John McCall56ca35d2011-02-17 10:25:35 +00006282 OpaqueValueExpr *opaqueValue = 0;
6283 Expr *commonExpr = 0;
6284 if (LHSExpr == 0) {
6285 commonExpr = CondExpr;
6286
6287 // We usually want to apply unary conversions *before* saving, except
6288 // in the special case of a C++ l-value conditional.
6289 if (!(getLangOptions().CPlusPlus
6290 && !commonExpr->isTypeDependent()
6291 && commonExpr->getValueKind() == RHSExpr->getValueKind()
6292 && commonExpr->isGLValue()
6293 && commonExpr->isOrdinaryOrBitFieldObject()
6294 && RHSExpr->isOrdinaryOrBitFieldObject()
6295 && Context.hasSameType(commonExpr->getType(), RHSExpr->getType()))) {
John Wiegley429bb272011-04-08 18:41:53 +00006296 ExprResult commonRes = UsualUnaryConversions(commonExpr);
6297 if (commonRes.isInvalid())
6298 return ExprError();
6299 commonExpr = commonRes.take();
John McCall56ca35d2011-02-17 10:25:35 +00006300 }
6301
6302 opaqueValue = new (Context) OpaqueValueExpr(commonExpr->getExprLoc(),
6303 commonExpr->getType(),
6304 commonExpr->getValueKind(),
6305 commonExpr->getObjectKind());
6306 LHSExpr = CondExpr = opaqueValue;
Fariborz Jahanianf9b949f2010-08-31 18:02:20 +00006307 }
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00006308
John McCallf89e55a2010-11-18 06:31:45 +00006309 ExprValueKind VK = VK_RValue;
John McCall09431682010-11-18 19:01:18 +00006310 ExprObjectKind OK = OK_Ordinary;
John Wiegley429bb272011-04-08 18:41:53 +00006311 ExprResult Cond = Owned(CondExpr), LHS = Owned(LHSExpr), RHS = Owned(RHSExpr);
6312 QualType result = CheckConditionalOperands(Cond, LHS, RHS,
John McCall56ca35d2011-02-17 10:25:35 +00006313 VK, OK, QuestionLoc);
John Wiegley429bb272011-04-08 18:41:53 +00006314 if (result.isNull() || Cond.isInvalid() || LHS.isInvalid() ||
6315 RHS.isInvalid())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00006316 return ExprError();
6317
Hans Wennborg9cfdae32011-06-03 18:00:36 +00006318 DiagnoseConditionalPrecedence(*this, QuestionLoc, Cond.get(), LHS.get(),
6319 RHS.get());
6320
John McCall56ca35d2011-02-17 10:25:35 +00006321 if (!commonExpr)
John Wiegley429bb272011-04-08 18:41:53 +00006322 return Owned(new (Context) ConditionalOperator(Cond.take(), QuestionLoc,
6323 LHS.take(), ColonLoc,
6324 RHS.take(), result, VK, OK));
John McCall56ca35d2011-02-17 10:25:35 +00006325
6326 return Owned(new (Context)
John Wiegley429bb272011-04-08 18:41:53 +00006327 BinaryConditionalOperator(commonExpr, opaqueValue, Cond.take(), LHS.take(),
6328 RHS.take(), QuestionLoc, ColonLoc, result, VK, OK));
Reid Spencer5f016e22007-07-11 17:01:13 +00006329}
6330
John McCalle4be87e2011-01-31 23:13:11 +00006331// checkPointerTypesForAssignment - This is a very tricky routine (despite
Mike Stumpeed9cac2009-02-19 03:04:26 +00006332// being closely modeled after the C99 spec:-). The odd characteristic of this
Reid Spencer5f016e22007-07-11 17:01:13 +00006333// routine is it effectively iqnores the qualifiers on the top level pointee.
6334// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3].
6335// FIXME: add a couple examples in this comment.
John McCalle4be87e2011-01-31 23:13:11 +00006336static Sema::AssignConvertType
6337checkPointerTypesForAssignment(Sema &S, QualType lhsType, QualType rhsType) {
6338 assert(lhsType.isCanonical() && "LHS not canonicalized!");
6339 assert(rhsType.isCanonical() && "RHS not canonicalized!");
Mike Stumpeed9cac2009-02-19 03:04:26 +00006340
Reid Spencer5f016e22007-07-11 17:01:13 +00006341 // get the "pointed to" type (ignoring qualifiers at the top level)
John McCall86c05f32011-02-01 00:10:29 +00006342 const Type *lhptee, *rhptee;
6343 Qualifiers lhq, rhq;
6344 llvm::tie(lhptee, lhq) = cast<PointerType>(lhsType)->getPointeeType().split();
6345 llvm::tie(rhptee, rhq) = cast<PointerType>(rhsType)->getPointeeType().split();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006346
John McCalle4be87e2011-01-31 23:13:11 +00006347 Sema::AssignConvertType ConvTy = Sema::Compatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006348
6349 // C99 6.5.16.1p1: This following citation is common to constraints
6350 // 3 & 4 (below). ...and the type *pointed to* by the left has all the
6351 // qualifiers of the type *pointed to* by the right;
John McCall86c05f32011-02-01 00:10:29 +00006352 Qualifiers lq;
6353
6354 if (!lhq.compatiblyIncludes(rhq)) {
6355 // Treat address-space mismatches as fatal. TODO: address subspaces
6356 if (lhq.getAddressSpace() != rhq.getAddressSpace())
6357 ConvTy = Sema::IncompatiblePointerDiscardsQualifiers;
6358
John McCall22348732011-03-26 02:56:45 +00006359 // It's okay to add or remove GC qualifiers when converting to
6360 // and from void*.
6361 else if (lhq.withoutObjCGCAttr().compatiblyIncludes(rhq.withoutObjCGCAttr())
6362 && (lhptee->isVoidType() || rhptee->isVoidType()))
6363 ; // keep old
6364
John McCall86c05f32011-02-01 00:10:29 +00006365 // For GCC compatibility, other qualifier mismatches are treated
6366 // as still compatible in C.
6367 else ConvTy = Sema::CompatiblePointerDiscardsQualifiers;
6368 }
Reid Spencer5f016e22007-07-11 17:01:13 +00006369
Mike Stumpeed9cac2009-02-19 03:04:26 +00006370 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or
6371 // incomplete type and the other is a pointer to a qualified or unqualified
Reid Spencer5f016e22007-07-11 17:01:13 +00006372 // version of void...
Chris Lattnerbfe639e2008-01-03 22:56:36 +00006373 if (lhptee->isVoidType()) {
Chris Lattnerd805bec2008-04-02 06:59:01 +00006374 if (rhptee->isIncompleteOrObjectType())
Chris Lattner5cf216b2008-01-04 18:04:52 +00006375 return ConvTy;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006376
Chris Lattnerbfe639e2008-01-03 22:56:36 +00006377 // As an extension, we allow cast to/from void* to function pointer.
Chris Lattnerd805bec2008-04-02 06:59:01 +00006378 assert(rhptee->isFunctionType());
John McCalle4be87e2011-01-31 23:13:11 +00006379 return Sema::FunctionVoidPointer;
Chris Lattnerbfe639e2008-01-03 22:56:36 +00006380 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006381
Chris Lattnerbfe639e2008-01-03 22:56:36 +00006382 if (rhptee->isVoidType()) {
Chris Lattnerd805bec2008-04-02 06:59:01 +00006383 if (lhptee->isIncompleteOrObjectType())
Chris Lattner5cf216b2008-01-04 18:04:52 +00006384 return ConvTy;
Chris Lattnerbfe639e2008-01-03 22:56:36 +00006385
6386 // As an extension, we allow cast to/from void* to function pointer.
Chris Lattnerd805bec2008-04-02 06:59:01 +00006387 assert(lhptee->isFunctionType());
John McCalle4be87e2011-01-31 23:13:11 +00006388 return Sema::FunctionVoidPointer;
Chris Lattnerbfe639e2008-01-03 22:56:36 +00006389 }
John McCall86c05f32011-02-01 00:10:29 +00006390
Mike Stumpeed9cac2009-02-19 03:04:26 +00006391 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or
Reid Spencer5f016e22007-07-11 17:01:13 +00006392 // unqualified versions of compatible types, ...
John McCall86c05f32011-02-01 00:10:29 +00006393 QualType ltrans = QualType(lhptee, 0), rtrans = QualType(rhptee, 0);
6394 if (!S.Context.typesAreCompatible(ltrans, rtrans)) {
Eli Friedmanf05c05d2009-03-22 23:59:44 +00006395 // Check if the pointee types are compatible ignoring the sign.
6396 // We explicitly check for char so that we catch "char" vs
6397 // "unsigned char" on systems where "char" is unsigned.
Chris Lattner6a2b9262009-10-17 20:33:28 +00006398 if (lhptee->isCharType())
John McCall86c05f32011-02-01 00:10:29 +00006399 ltrans = S.Context.UnsignedCharTy;
Douglas Gregorf6094622010-07-23 15:58:24 +00006400 else if (lhptee->hasSignedIntegerRepresentation())
John McCall86c05f32011-02-01 00:10:29 +00006401 ltrans = S.Context.getCorrespondingUnsignedType(ltrans);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006402
Chris Lattner6a2b9262009-10-17 20:33:28 +00006403 if (rhptee->isCharType())
John McCall86c05f32011-02-01 00:10:29 +00006404 rtrans = S.Context.UnsignedCharTy;
Douglas Gregorf6094622010-07-23 15:58:24 +00006405 else if (rhptee->hasSignedIntegerRepresentation())
John McCall86c05f32011-02-01 00:10:29 +00006406 rtrans = S.Context.getCorrespondingUnsignedType(rtrans);
Chris Lattner6a2b9262009-10-17 20:33:28 +00006407
John McCall86c05f32011-02-01 00:10:29 +00006408 if (ltrans == rtrans) {
Eli Friedmanf05c05d2009-03-22 23:59:44 +00006409 // Types are compatible ignoring the sign. Qualifier incompatibility
6410 // takes priority over sign incompatibility because the sign
6411 // warning can be disabled.
John McCalle4be87e2011-01-31 23:13:11 +00006412 if (ConvTy != Sema::Compatible)
Eli Friedmanf05c05d2009-03-22 23:59:44 +00006413 return ConvTy;
John McCall86c05f32011-02-01 00:10:29 +00006414
John McCalle4be87e2011-01-31 23:13:11 +00006415 return Sema::IncompatiblePointerSign;
Eli Friedmanf05c05d2009-03-22 23:59:44 +00006416 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006417
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00006418 // If we are a multi-level pointer, it's possible that our issue is simply
6419 // one of qualification - e.g. char ** -> const char ** is not allowed. If
6420 // the eventual target type is the same and the pointers have the same
6421 // level of indirection, this must be the issue.
John McCalle4be87e2011-01-31 23:13:11 +00006422 if (isa<PointerType>(lhptee) && isa<PointerType>(rhptee)) {
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00006423 do {
John McCall86c05f32011-02-01 00:10:29 +00006424 lhptee = cast<PointerType>(lhptee)->getPointeeType().getTypePtr();
6425 rhptee = cast<PointerType>(rhptee)->getPointeeType().getTypePtr();
John McCalle4be87e2011-01-31 23:13:11 +00006426 } while (isa<PointerType>(lhptee) && isa<PointerType>(rhptee));
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006427
John McCall86c05f32011-02-01 00:10:29 +00006428 if (lhptee == rhptee)
John McCalle4be87e2011-01-31 23:13:11 +00006429 return Sema::IncompatibleNestedPointerQualifiers;
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00006430 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006431
Eli Friedmanf05c05d2009-03-22 23:59:44 +00006432 // General pointer incompatibility takes priority over qualifiers.
John McCalle4be87e2011-01-31 23:13:11 +00006433 return Sema::IncompatiblePointer;
Eli Friedmanf05c05d2009-03-22 23:59:44 +00006434 }
Chris Lattner5cf216b2008-01-04 18:04:52 +00006435 return ConvTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00006436}
6437
John McCalle4be87e2011-01-31 23:13:11 +00006438/// checkBlockPointerTypesForAssignment - This routine determines whether two
Steve Naroff1c7d0672008-09-04 15:10:53 +00006439/// block pointer types are compatible or whether a block and normal pointer
6440/// are compatible. It is more restrict than comparing two function pointer
6441// types.
John McCalle4be87e2011-01-31 23:13:11 +00006442static Sema::AssignConvertType
6443checkBlockPointerTypesForAssignment(Sema &S, QualType lhsType,
6444 QualType rhsType) {
6445 assert(lhsType.isCanonical() && "LHS not canonicalized!");
6446 assert(rhsType.isCanonical() && "RHS not canonicalized!");
6447
Steve Naroff1c7d0672008-09-04 15:10:53 +00006448 QualType lhptee, rhptee;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006449
Steve Naroff1c7d0672008-09-04 15:10:53 +00006450 // get the "pointed to" type (ignoring qualifiers at the top level)
John McCalle4be87e2011-01-31 23:13:11 +00006451 lhptee = cast<BlockPointerType>(lhsType)->getPointeeType();
6452 rhptee = cast<BlockPointerType>(rhsType)->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006453
John McCalle4be87e2011-01-31 23:13:11 +00006454 // In C++, the types have to match exactly.
6455 if (S.getLangOptions().CPlusPlus)
6456 return Sema::IncompatibleBlockPointer;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006457
John McCalle4be87e2011-01-31 23:13:11 +00006458 Sema::AssignConvertType ConvTy = Sema::Compatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006459
Steve Naroff1c7d0672008-09-04 15:10:53 +00006460 // For blocks we enforce that qualifiers are identical.
John McCalle4be87e2011-01-31 23:13:11 +00006461 if (lhptee.getLocalQualifiers() != rhptee.getLocalQualifiers())
6462 ConvTy = Sema::CompatiblePointerDiscardsQualifiers;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006463
John McCalle4be87e2011-01-31 23:13:11 +00006464 if (!S.Context.typesAreBlockPointerCompatible(lhsType, rhsType))
6465 return Sema::IncompatibleBlockPointer;
6466
Steve Naroff1c7d0672008-09-04 15:10:53 +00006467 return ConvTy;
6468}
6469
John McCalle4be87e2011-01-31 23:13:11 +00006470/// checkObjCPointerTypesForAssignment - Compares two objective-c pointer types
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00006471/// for assignment compatibility.
John McCalle4be87e2011-01-31 23:13:11 +00006472static Sema::AssignConvertType
6473checkObjCPointerTypesForAssignment(Sema &S, QualType lhsType, QualType rhsType) {
6474 assert(lhsType.isCanonical() && "LHS was not canonicalized!");
6475 assert(rhsType.isCanonical() && "RHS was not canonicalized!");
6476
Fariborz Jahaniand4c60902010-03-19 18:06:10 +00006477 if (lhsType->isObjCBuiltinType()) {
6478 // Class is not compatible with ObjC object pointers.
Fariborz Jahanian528adb12010-03-24 21:00:27 +00006479 if (lhsType->isObjCClassType() && !rhsType->isObjCBuiltinType() &&
6480 !rhsType->isObjCQualifiedClassType())
John McCalle4be87e2011-01-31 23:13:11 +00006481 return Sema::IncompatiblePointer;
6482 return Sema::Compatible;
Fariborz Jahaniand4c60902010-03-19 18:06:10 +00006483 }
6484 if (rhsType->isObjCBuiltinType()) {
6485 // Class is not compatible with ObjC object pointers.
Fariborz Jahanian528adb12010-03-24 21:00:27 +00006486 if (rhsType->isObjCClassType() && !lhsType->isObjCBuiltinType() &&
6487 !lhsType->isObjCQualifiedClassType())
John McCalle4be87e2011-01-31 23:13:11 +00006488 return Sema::IncompatiblePointer;
6489 return Sema::Compatible;
Fariborz Jahaniand4c60902010-03-19 18:06:10 +00006490 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006491 QualType lhptee =
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00006492 lhsType->getAs<ObjCObjectPointerType>()->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006493 QualType rhptee =
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00006494 rhsType->getAs<ObjCObjectPointerType>()->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006495
John McCalle4be87e2011-01-31 23:13:11 +00006496 if (!lhptee.isAtLeastAsQualifiedAs(rhptee))
6497 return Sema::CompatiblePointerDiscardsQualifiers;
6498
6499 if (S.Context.typesAreCompatible(lhsType, rhsType))
6500 return Sema::Compatible;
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00006501 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType())
John McCalle4be87e2011-01-31 23:13:11 +00006502 return Sema::IncompatibleObjCQualifiedId;
6503 return Sema::IncompatiblePointer;
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00006504}
6505
John McCall1c23e912010-11-16 02:32:08 +00006506Sema::AssignConvertType
Douglas Gregorb608b982011-01-28 02:26:04 +00006507Sema::CheckAssignmentConstraints(SourceLocation Loc,
6508 QualType lhsType, QualType rhsType) {
John McCall1c23e912010-11-16 02:32:08 +00006509 // Fake up an opaque expression. We don't actually care about what
6510 // cast operations are required, so if CheckAssignmentConstraints
6511 // adds casts to this they'll be wasted, but fortunately that doesn't
6512 // usually happen on valid code.
Douglas Gregorb608b982011-01-28 02:26:04 +00006513 OpaqueValueExpr rhs(Loc, rhsType, VK_RValue);
John Wiegley429bb272011-04-08 18:41:53 +00006514 ExprResult rhsPtr = &rhs;
John McCall1c23e912010-11-16 02:32:08 +00006515 CastKind K = CK_Invalid;
6516
6517 return CheckAssignmentConstraints(lhsType, rhsPtr, K);
6518}
6519
Mike Stumpeed9cac2009-02-19 03:04:26 +00006520/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently
6521/// has code to accommodate several GCC extensions when type checking
Reid Spencer5f016e22007-07-11 17:01:13 +00006522/// pointers. Here are some objectionable examples that GCC considers warnings:
6523///
6524/// int a, *pint;
6525/// short *pshort;
6526/// struct foo *pfoo;
6527///
6528/// pint = pshort; // warning: assignment from incompatible pointer type
6529/// a = pint; // warning: assignment makes integer from pointer without a cast
6530/// pint = a; // warning: assignment makes pointer from integer without a cast
6531/// pint = pfoo; // warning: assignment from incompatible pointer type
6532///
6533/// As a result, the code for dealing with pointers is more complex than the
Mike Stumpeed9cac2009-02-19 03:04:26 +00006534/// C99 spec dictates.
Reid Spencer5f016e22007-07-11 17:01:13 +00006535///
John McCalldaa8e4e2010-11-15 09:13:47 +00006536/// Sets 'Kind' for any result kind except Incompatible.
Chris Lattner5cf216b2008-01-04 18:04:52 +00006537Sema::AssignConvertType
John Wiegley429bb272011-04-08 18:41:53 +00006538Sema::CheckAssignmentConstraints(QualType lhsType, ExprResult &rhs,
John McCalldaa8e4e2010-11-15 09:13:47 +00006539 CastKind &Kind) {
John Wiegley429bb272011-04-08 18:41:53 +00006540 QualType rhsType = rhs.get()->getType();
John McCall1c23e912010-11-16 02:32:08 +00006541
Chris Lattnerfc144e22008-01-04 23:18:45 +00006542 // Get canonical types. We're not formatting these types, just comparing
6543 // them.
Chris Lattnerb77792e2008-07-26 22:17:49 +00006544 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType();
6545 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType();
Eli Friedmanf8f873d2008-05-30 18:07:22 +00006546
John McCallb6cfa242011-01-31 22:28:28 +00006547 // Common case: no conversion required.
John McCalldaa8e4e2010-11-15 09:13:47 +00006548 if (lhsType == rhsType) {
6549 Kind = CK_NoOp;
John McCalldaa8e4e2010-11-15 09:13:47 +00006550 return Compatible;
David Chisnall0f436562009-08-17 16:35:33 +00006551 }
6552
Douglas Gregor9d293df2008-10-28 00:22:11 +00006553 // If the left-hand side is a reference type, then we are in a
6554 // (rare!) case where we've allowed the use of references in C,
6555 // e.g., as a parameter type in a built-in function. In this case,
6556 // just make sure that the type referenced is compatible with the
6557 // right-hand side type. The caller is responsible for adjusting
6558 // lhsType so that the resulting expression does not have reference
6559 // type.
Ted Kremenek6217b802009-07-29 21:53:49 +00006560 if (const ReferenceType *lhsTypeRef = lhsType->getAs<ReferenceType>()) {
John McCalldaa8e4e2010-11-15 09:13:47 +00006561 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) {
6562 Kind = CK_LValueBitCast;
Anders Carlsson793680e2007-10-12 23:56:29 +00006563 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00006564 }
Chris Lattnerfc144e22008-01-04 23:18:45 +00006565 return Incompatible;
Fariborz Jahanian411f3732007-12-19 17:45:58 +00006566 }
John McCallb6cfa242011-01-31 22:28:28 +00006567
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00006568 // Allow scalar to ExtVector assignments, and assignments of an ExtVector type
6569 // to the same ExtVector type.
6570 if (lhsType->isExtVectorType()) {
6571 if (rhsType->isExtVectorType())
John McCalldaa8e4e2010-11-15 09:13:47 +00006572 return Incompatible;
6573 if (rhsType->isArithmeticType()) {
John McCall1c23e912010-11-16 02:32:08 +00006574 // CK_VectorSplat does T -> vector T, so first cast to the
6575 // element type.
6576 QualType elType = cast<ExtVectorType>(lhsType)->getElementType();
6577 if (elType != rhsType) {
6578 Kind = PrepareScalarCast(*this, rhs, elType);
John Wiegley429bb272011-04-08 18:41:53 +00006579 rhs = ImpCastExprToType(rhs.take(), elType, Kind);
John McCall1c23e912010-11-16 02:32:08 +00006580 }
6581 Kind = CK_VectorSplat;
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00006582 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00006583 }
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00006584 }
Mike Stump1eb44332009-09-09 15:08:12 +00006585
John McCallb6cfa242011-01-31 22:28:28 +00006586 // Conversions to or from vector type.
Nate Begemanbe2341d2008-07-14 18:02:46 +00006587 if (lhsType->isVectorType() || rhsType->isVectorType()) {
Douglas Gregor255210e2010-08-06 10:14:59 +00006588 if (lhsType->isVectorType() && rhsType->isVectorType()) {
Bob Wilsonde3deea2010-12-02 00:25:15 +00006589 // Allow assignments of an AltiVec vector type to an equivalent GCC
6590 // vector type and vice versa
6591 if (Context.areCompatibleVectorTypes(lhsType, rhsType)) {
6592 Kind = CK_BitCast;
6593 return Compatible;
6594 }
6595
Douglas Gregor255210e2010-08-06 10:14:59 +00006596 // If we are allowing lax vector conversions, and LHS and RHS are both
6597 // vectors, the total size only needs to be the same. This is a bitcast;
6598 // no bits are changed but the result type is different.
6599 if (getLangOptions().LaxVectorConversions &&
John McCalldaa8e4e2010-11-15 09:13:47 +00006600 (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType))) {
John McCall0c6d28d2010-11-15 10:08:00 +00006601 Kind = CK_BitCast;
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00006602 return IncompatibleVectors;
John McCalldaa8e4e2010-11-15 09:13:47 +00006603 }
Chris Lattnere8b3e962008-01-04 23:32:24 +00006604 }
6605 return Incompatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006606 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00006607
John McCallb6cfa242011-01-31 22:28:28 +00006608 // Arithmetic conversions.
Douglas Gregor88623ad2010-05-23 21:53:47 +00006609 if (lhsType->isArithmeticType() && rhsType->isArithmeticType() &&
John McCalldaa8e4e2010-11-15 09:13:47 +00006610 !(getLangOptions().CPlusPlus && lhsType->isEnumeralType())) {
John McCall1c23e912010-11-16 02:32:08 +00006611 Kind = PrepareScalarCast(*this, rhs, lhsType);
Reid Spencer5f016e22007-07-11 17:01:13 +00006612 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00006613 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00006614
John McCallb6cfa242011-01-31 22:28:28 +00006615 // Conversions to normal pointers.
6616 if (const PointerType *lhsPointer = dyn_cast<PointerType>(lhsType)) {
6617 // U* -> T*
John McCalldaa8e4e2010-11-15 09:13:47 +00006618 if (isa<PointerType>(rhsType)) {
6619 Kind = CK_BitCast;
John McCalle4be87e2011-01-31 23:13:11 +00006620 return checkPointerTypesForAssignment(*this, lhsType, rhsType);
John McCalldaa8e4e2010-11-15 09:13:47 +00006621 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006622
John McCallb6cfa242011-01-31 22:28:28 +00006623 // int -> T*
6624 if (rhsType->isIntegerType()) {
6625 Kind = CK_IntegralToPointer; // FIXME: null?
6626 return IntToPointer;
Steve Naroff14108da2009-07-10 23:34:53 +00006627 }
John McCallb6cfa242011-01-31 22:28:28 +00006628
6629 // C pointers are not compatible with ObjC object pointers,
6630 // with two exceptions:
6631 if (isa<ObjCObjectPointerType>(rhsType)) {
6632 // - conversions to void*
6633 if (lhsPointer->getPointeeType()->isVoidType()) {
6634 Kind = CK_AnyPointerToObjCPointerCast;
6635 return Compatible;
6636 }
6637
6638 // - conversions from 'Class' to the redefinition type
6639 if (rhsType->isObjCClassType() &&
6640 Context.hasSameType(lhsType, Context.ObjCClassRedefinitionType)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00006641 Kind = CK_BitCast;
Douglas Gregor63a94902008-11-27 00:44:28 +00006642 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00006643 }
Steve Naroffb4406862008-09-29 18:10:17 +00006644
John McCallb6cfa242011-01-31 22:28:28 +00006645 Kind = CK_BitCast;
6646 return IncompatiblePointer;
6647 }
6648
6649 // U^ -> void*
6650 if (rhsType->getAs<BlockPointerType>()) {
6651 if (lhsPointer->getPointeeType()->isVoidType()) {
6652 Kind = CK_BitCast;
Steve Naroffb4406862008-09-29 18:10:17 +00006653 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00006654 }
Steve Naroffb4406862008-09-29 18:10:17 +00006655 }
John McCallb6cfa242011-01-31 22:28:28 +00006656
Steve Naroff1c7d0672008-09-04 15:10:53 +00006657 return Incompatible;
6658 }
6659
John McCallb6cfa242011-01-31 22:28:28 +00006660 // Conversions to block pointers.
Steve Naroff1c7d0672008-09-04 15:10:53 +00006661 if (isa<BlockPointerType>(lhsType)) {
John McCallb6cfa242011-01-31 22:28:28 +00006662 // U^ -> T^
6663 if (rhsType->isBlockPointerType()) {
6664 Kind = CK_AnyPointerToBlockPointerCast;
John McCalle4be87e2011-01-31 23:13:11 +00006665 return checkBlockPointerTypesForAssignment(*this, lhsType, rhsType);
John McCallb6cfa242011-01-31 22:28:28 +00006666 }
6667
6668 // int or null -> T^
John McCalldaa8e4e2010-11-15 09:13:47 +00006669 if (rhsType->isIntegerType()) {
6670 Kind = CK_IntegralToPointer; // FIXME: null
Eli Friedmand8f4f432009-02-25 04:20:42 +00006671 return IntToBlockPointer;
John McCalldaa8e4e2010-11-15 09:13:47 +00006672 }
6673
John McCallb6cfa242011-01-31 22:28:28 +00006674 // id -> T^
6675 if (getLangOptions().ObjC1 && rhsType->isObjCIdType()) {
6676 Kind = CK_AnyPointerToBlockPointerCast;
Steve Naroffb4406862008-09-29 18:10:17 +00006677 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00006678 }
Steve Naroffb4406862008-09-29 18:10:17 +00006679
John McCallb6cfa242011-01-31 22:28:28 +00006680 // void* -> T^
John McCalldaa8e4e2010-11-15 09:13:47 +00006681 if (const PointerType *RHSPT = rhsType->getAs<PointerType>())
John McCallb6cfa242011-01-31 22:28:28 +00006682 if (RHSPT->getPointeeType()->isVoidType()) {
6683 Kind = CK_AnyPointerToBlockPointerCast;
Douglas Gregor63a94902008-11-27 00:44:28 +00006684 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00006685 }
John McCalldaa8e4e2010-11-15 09:13:47 +00006686
Chris Lattnerfc144e22008-01-04 23:18:45 +00006687 return Incompatible;
6688 }
6689
John McCallb6cfa242011-01-31 22:28:28 +00006690 // Conversions to Objective-C pointers.
Steve Naroff14108da2009-07-10 23:34:53 +00006691 if (isa<ObjCObjectPointerType>(lhsType)) {
John McCallb6cfa242011-01-31 22:28:28 +00006692 // A* -> B*
6693 if (rhsType->isObjCObjectPointerType()) {
6694 Kind = CK_BitCast;
John McCalle4be87e2011-01-31 23:13:11 +00006695 return checkObjCPointerTypesForAssignment(*this, lhsType, rhsType);
John McCallb6cfa242011-01-31 22:28:28 +00006696 }
6697
6698 // int or null -> A*
John McCalldaa8e4e2010-11-15 09:13:47 +00006699 if (rhsType->isIntegerType()) {
6700 Kind = CK_IntegralToPointer; // FIXME: null
Steve Naroff14108da2009-07-10 23:34:53 +00006701 return IntToPointer;
John McCalldaa8e4e2010-11-15 09:13:47 +00006702 }
6703
John McCallb6cfa242011-01-31 22:28:28 +00006704 // In general, C pointers are not compatible with ObjC object pointers,
6705 // with two exceptions:
Steve Naroff14108da2009-07-10 23:34:53 +00006706 if (isa<PointerType>(rhsType)) {
John McCallb6cfa242011-01-31 22:28:28 +00006707 // - conversions from 'void*'
6708 if (rhsType->isVoidPointerType()) {
6709 Kind = CK_AnyPointerToObjCPointerCast;
Steve Naroff67ef8ea2009-07-20 17:56:53 +00006710 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00006711 }
6712
6713 // - conversions to 'Class' from its redefinition type
6714 if (lhsType->isObjCClassType() &&
6715 Context.hasSameType(rhsType, Context.ObjCClassRedefinitionType)) {
6716 Kind = CK_BitCast;
6717 return Compatible;
6718 }
6719
6720 Kind = CK_AnyPointerToObjCPointerCast;
Steve Naroff67ef8ea2009-07-20 17:56:53 +00006721 return IncompatiblePointer;
Steve Naroff14108da2009-07-10 23:34:53 +00006722 }
John McCallb6cfa242011-01-31 22:28:28 +00006723
6724 // T^ -> A*
6725 if (rhsType->isBlockPointerType()) {
6726 Kind = CK_AnyPointerToObjCPointerCast;
Steve Naroff14108da2009-07-10 23:34:53 +00006727 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00006728 }
6729
Steve Naroff14108da2009-07-10 23:34:53 +00006730 return Incompatible;
6731 }
John McCallb6cfa242011-01-31 22:28:28 +00006732
6733 // Conversions from pointers that are not covered by the above.
Chris Lattner78eca282008-04-07 06:49:41 +00006734 if (isa<PointerType>(rhsType)) {
John McCallb6cfa242011-01-31 22:28:28 +00006735 // T* -> _Bool
John McCalldaa8e4e2010-11-15 09:13:47 +00006736 if (lhsType == Context.BoolTy) {
6737 Kind = CK_PointerToBoolean;
Eli Friedmanf8f873d2008-05-30 18:07:22 +00006738 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00006739 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00006740
John McCallb6cfa242011-01-31 22:28:28 +00006741 // T* -> int
John McCalldaa8e4e2010-11-15 09:13:47 +00006742 if (lhsType->isIntegerType()) {
6743 Kind = CK_PointerToIntegral;
Chris Lattnerb7b61152008-01-04 18:22:42 +00006744 return PointerToInt;
John McCalldaa8e4e2010-11-15 09:13:47 +00006745 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006746
Chris Lattnerfc144e22008-01-04 23:18:45 +00006747 return Incompatible;
Chris Lattnerfc144e22008-01-04 23:18:45 +00006748 }
John McCallb6cfa242011-01-31 22:28:28 +00006749
6750 // Conversions from Objective-C pointers that are not covered by the above.
Steve Naroff14108da2009-07-10 23:34:53 +00006751 if (isa<ObjCObjectPointerType>(rhsType)) {
John McCallb6cfa242011-01-31 22:28:28 +00006752 // T* -> _Bool
John McCalldaa8e4e2010-11-15 09:13:47 +00006753 if (lhsType == Context.BoolTy) {
6754 Kind = CK_PointerToBoolean;
Steve Naroff14108da2009-07-10 23:34:53 +00006755 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00006756 }
Steve Naroff14108da2009-07-10 23:34:53 +00006757
John McCallb6cfa242011-01-31 22:28:28 +00006758 // T* -> int
John McCalldaa8e4e2010-11-15 09:13:47 +00006759 if (lhsType->isIntegerType()) {
6760 Kind = CK_PointerToIntegral;
Steve Naroff14108da2009-07-10 23:34:53 +00006761 return PointerToInt;
John McCalldaa8e4e2010-11-15 09:13:47 +00006762 }
6763
Steve Naroff14108da2009-07-10 23:34:53 +00006764 return Incompatible;
6765 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00006766
John McCallb6cfa242011-01-31 22:28:28 +00006767 // struct A -> struct B
Chris Lattnerfc144e22008-01-04 23:18:45 +00006768 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00006769 if (Context.typesAreCompatible(lhsType, rhsType)) {
6770 Kind = CK_NoOp;
Reid Spencer5f016e22007-07-11 17:01:13 +00006771 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00006772 }
Reid Spencer5f016e22007-07-11 17:01:13 +00006773 }
John McCallb6cfa242011-01-31 22:28:28 +00006774
Reid Spencer5f016e22007-07-11 17:01:13 +00006775 return Incompatible;
6776}
6777
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006778/// \brief Constructs a transparent union from an expression that is
6779/// used to initialize the transparent union.
John Wiegley429bb272011-04-08 18:41:53 +00006780static void ConstructTransparentUnion(Sema &S, ASTContext &C, ExprResult &EResult,
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006781 QualType UnionType, FieldDecl *Field) {
6782 // Build an initializer list that designates the appropriate member
6783 // of the transparent union.
John Wiegley429bb272011-04-08 18:41:53 +00006784 Expr *E = EResult.take();
Ted Kremenek709210f2010-04-13 23:39:13 +00006785 InitListExpr *Initializer = new (C) InitListExpr(C, SourceLocation(),
Ted Kremenekba7bc552010-02-19 01:50:18 +00006786 &E, 1,
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006787 SourceLocation());
6788 Initializer->setType(UnionType);
6789 Initializer->setInitializedFieldInUnion(Field);
6790
6791 // Build a compound literal constructing a value of the transparent
6792 // union type from this initializer list.
John McCall42f56b52010-01-18 19:35:47 +00006793 TypeSourceInfo *unionTInfo = C.getTrivialTypeSourceInfo(UnionType);
John Wiegley429bb272011-04-08 18:41:53 +00006794 EResult = S.Owned(
6795 new (C) CompoundLiteralExpr(SourceLocation(), unionTInfo, UnionType,
6796 VK_RValue, Initializer, false));
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006797}
6798
6799Sema::AssignConvertType
John Wiegley429bb272011-04-08 18:41:53 +00006800Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, ExprResult &rExpr) {
6801 QualType FromType = rExpr.get()->getType();
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006802
Mike Stump1eb44332009-09-09 15:08:12 +00006803 // If the ArgType is a Union type, we want to handle a potential
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006804 // transparent_union GCC extension.
6805 const RecordType *UT = ArgType->getAsUnionType();
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00006806 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>())
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006807 return Incompatible;
6808
6809 // The field to initialize within the transparent union.
6810 RecordDecl *UD = UT->getDecl();
6811 FieldDecl *InitField = 0;
6812 // It's compatible if the expression matches any of the fields.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00006813 for (RecordDecl::field_iterator it = UD->field_begin(),
6814 itend = UD->field_end();
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006815 it != itend; ++it) {
6816 if (it->getType()->isPointerType()) {
6817 // If the transparent union contains a pointer type, we allow:
6818 // 1) void pointer
6819 // 2) null pointer constant
6820 if (FromType->isPointerType())
Ted Kremenek6217b802009-07-29 21:53:49 +00006821 if (FromType->getAs<PointerType>()->getPointeeType()->isVoidType()) {
John Wiegley429bb272011-04-08 18:41:53 +00006822 rExpr = ImpCastExprToType(rExpr.take(), it->getType(), CK_BitCast);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006823 InitField = *it;
6824 break;
6825 }
Mike Stump1eb44332009-09-09 15:08:12 +00006826
John Wiegley429bb272011-04-08 18:41:53 +00006827 if (rExpr.get()->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00006828 Expr::NPC_ValueDependentIsNull)) {
John Wiegley429bb272011-04-08 18:41:53 +00006829 rExpr = ImpCastExprToType(rExpr.take(), it->getType(), CK_NullToPointer);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006830 InitField = *it;
6831 break;
6832 }
6833 }
6834
John McCalldaa8e4e2010-11-15 09:13:47 +00006835 CastKind Kind = CK_Invalid;
John Wiegley429bb272011-04-08 18:41:53 +00006836 if (CheckAssignmentConstraints(it->getType(), rExpr, Kind)
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006837 == Compatible) {
John Wiegley429bb272011-04-08 18:41:53 +00006838 rExpr = ImpCastExprToType(rExpr.take(), it->getType(), Kind);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006839 InitField = *it;
6840 break;
6841 }
6842 }
6843
6844 if (!InitField)
6845 return Incompatible;
6846
John Wiegley429bb272011-04-08 18:41:53 +00006847 ConstructTransparentUnion(*this, Context, rExpr, ArgType, InitField);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00006848 return Compatible;
6849}
6850
Chris Lattner5cf216b2008-01-04 18:04:52 +00006851Sema::AssignConvertType
John Wiegley429bb272011-04-08 18:41:53 +00006852Sema::CheckSingleAssignmentConstraints(QualType lhsType, ExprResult &rExpr) {
Douglas Gregor98cd5992008-10-21 23:43:52 +00006853 if (getLangOptions().CPlusPlus) {
6854 if (!lhsType->isRecordType()) {
6855 // C++ 5.17p3: If the left operand is not of class type, the
6856 // expression is implicitly converted (C++ 4) to the
6857 // cv-unqualified type of the left operand.
John Wiegley429bb272011-04-08 18:41:53 +00006858 ExprResult Res = PerformImplicitConversion(rExpr.get(),
6859 lhsType.getUnqualifiedType(),
6860 AA_Assigning);
6861 if (Res.isInvalid())
Douglas Gregor98cd5992008-10-21 23:43:52 +00006862 return Incompatible;
John Wiegley429bb272011-04-08 18:41:53 +00006863 rExpr = move(Res);
Chris Lattner2c4463f2009-04-12 09:02:39 +00006864 return Compatible;
Douglas Gregor98cd5992008-10-21 23:43:52 +00006865 }
6866
6867 // FIXME: Currently, we fall through and treat C++ classes like C
6868 // structures.
John McCallf6a16482010-12-04 03:47:34 +00006869 }
Douglas Gregor98cd5992008-10-21 23:43:52 +00006870
Steve Naroff529a4ad2007-11-27 17:58:44 +00006871 // C99 6.5.16.1p1: the left operand is a pointer and the right is
6872 // a null pointer constant.
Mike Stump1eb44332009-09-09 15:08:12 +00006873 if ((lhsType->isPointerType() ||
6874 lhsType->isObjCObjectPointerType() ||
Mike Stumpeed9cac2009-02-19 03:04:26 +00006875 lhsType->isBlockPointerType())
John Wiegley429bb272011-04-08 18:41:53 +00006876 && rExpr.get()->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00006877 Expr::NPC_ValueDependentIsNull)) {
John Wiegley429bb272011-04-08 18:41:53 +00006878 rExpr = ImpCastExprToType(rExpr.take(), lhsType, CK_NullToPointer);
Steve Naroff529a4ad2007-11-27 17:58:44 +00006879 return Compatible;
6880 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006881
Chris Lattner943140e2007-10-16 02:55:40 +00006882 // This check seems unnatural, however it is necessary to ensure the proper
Steve Naroff90045e82007-07-13 23:32:42 +00006883 // conversion of functions/arrays. If the conversion were done for all
Douglas Gregor02a24ee2009-11-03 16:56:39 +00006884 // DeclExpr's (created by ActOnIdExpression), it would mess up the unary
Nick Lewyckyc133e9e2010-08-05 06:27:49 +00006885 // expressions that suppress this implicit conversion (&, sizeof).
Chris Lattner943140e2007-10-16 02:55:40 +00006886 //
Mike Stumpeed9cac2009-02-19 03:04:26 +00006887 // Suppress this for references: C++ 8.5.3p5.
John Wiegley429bb272011-04-08 18:41:53 +00006888 if (!lhsType->isReferenceType()) {
6889 rExpr = DefaultFunctionArrayLvalueConversion(rExpr.take());
6890 if (rExpr.isInvalid())
6891 return Incompatible;
6892 }
Steve Narofff1120de2007-08-24 22:33:52 +00006893
John McCalldaa8e4e2010-11-15 09:13:47 +00006894 CastKind Kind = CK_Invalid;
Chris Lattner5cf216b2008-01-04 18:04:52 +00006895 Sema::AssignConvertType result =
John McCall1c23e912010-11-16 02:32:08 +00006896 CheckAssignmentConstraints(lhsType, rExpr, Kind);
Mike Stumpeed9cac2009-02-19 03:04:26 +00006897
Steve Narofff1120de2007-08-24 22:33:52 +00006898 // C99 6.5.16.1p2: The value of the right operand is converted to the
6899 // type of the assignment expression.
Douglas Gregor9d293df2008-10-28 00:22:11 +00006900 // CheckAssignmentConstraints allows the left-hand side to be a reference,
6901 // so that we can use references in built-in functions even in C.
6902 // The getNonReferenceType() call makes sure that the resulting expression
6903 // does not have reference type.
John Wiegley429bb272011-04-08 18:41:53 +00006904 if (result != Incompatible && rExpr.get()->getType() != lhsType)
6905 rExpr = ImpCastExprToType(rExpr.take(), lhsType.getNonLValueExprType(Context), Kind);
Steve Narofff1120de2007-08-24 22:33:52 +00006906 return result;
Steve Naroff90045e82007-07-13 23:32:42 +00006907}
6908
John Wiegley429bb272011-04-08 18:41:53 +00006909QualType Sema::InvalidOperands(SourceLocation Loc, ExprResult &lex, ExprResult &rex) {
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00006910 Diag(Loc, diag::err_typecheck_invalid_operands)
John Wiegley429bb272011-04-08 18:41:53 +00006911 << lex.get()->getType() << rex.get()->getType()
6912 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Chris Lattnerca5eede2007-12-12 05:47:28 +00006913 return QualType();
Reid Spencer5f016e22007-07-11 17:01:13 +00006914}
6915
John Wiegley429bb272011-04-08 18:41:53 +00006916QualType Sema::CheckVectorOperands(SourceLocation Loc, ExprResult &lex, ExprResult &rex) {
Mike Stumpeed9cac2009-02-19 03:04:26 +00006917 // For conversion purposes, we ignore any qualifiers.
Nate Begeman1330b0e2008-04-04 01:30:25 +00006918 // For example, "const float" and "float" are equivalent.
Chris Lattnerb77792e2008-07-26 22:17:49 +00006919 QualType lhsType =
John Wiegley429bb272011-04-08 18:41:53 +00006920 Context.getCanonicalType(lex.get()->getType()).getUnqualifiedType();
Chris Lattnerb77792e2008-07-26 22:17:49 +00006921 QualType rhsType =
John Wiegley429bb272011-04-08 18:41:53 +00006922 Context.getCanonicalType(rex.get()->getType()).getUnqualifiedType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006923
Nate Begemanbe2341d2008-07-14 18:02:46 +00006924 // If the vector types are identical, return.
Nate Begeman1330b0e2008-04-04 01:30:25 +00006925 if (lhsType == rhsType)
Reid Spencer5f016e22007-07-11 17:01:13 +00006926 return lhsType;
Nate Begeman4119d1a2007-12-30 02:59:45 +00006927
Nate Begemanbe2341d2008-07-14 18:02:46 +00006928 // Handle the case of a vector & extvector type of the same size and element
6929 // type. It would be nice if we only had one vector type someday.
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00006930 if (getLangOptions().LaxVectorConversions) {
John McCall183700f2009-09-21 23:43:11 +00006931 if (const VectorType *LV = lhsType->getAs<VectorType>()) {
Chandler Carruth629f9e42010-08-30 07:36:24 +00006932 if (const VectorType *RV = rhsType->getAs<VectorType>()) {
Nate Begemanbe2341d2008-07-14 18:02:46 +00006933 if (LV->getElementType() == RV->getElementType() &&
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00006934 LV->getNumElements() == RV->getNumElements()) {
Douglas Gregor26bcf672010-05-19 03:21:00 +00006935 if (lhsType->isExtVectorType()) {
John Wiegley429bb272011-04-08 18:41:53 +00006936 rex = ImpCastExprToType(rex.take(), lhsType, CK_BitCast);
Douglas Gregor26bcf672010-05-19 03:21:00 +00006937 return lhsType;
6938 }
6939
John Wiegley429bb272011-04-08 18:41:53 +00006940 lex = ImpCastExprToType(lex.take(), rhsType, CK_BitCast);
Douglas Gregor26bcf672010-05-19 03:21:00 +00006941 return rhsType;
Eric Christophere84f9eb2010-08-26 00:42:16 +00006942 } else if (Context.getTypeSize(lhsType) ==Context.getTypeSize(rhsType)){
6943 // If we are allowing lax vector conversions, and LHS and RHS are both
6944 // vectors, the total size only needs to be the same. This is a
6945 // bitcast; no bits are changed but the result type is different.
John Wiegley429bb272011-04-08 18:41:53 +00006946 rex = ImpCastExprToType(rex.take(), lhsType, CK_BitCast);
Eric Christophere84f9eb2010-08-26 00:42:16 +00006947 return lhsType;
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00006948 }
Eric Christophere84f9eb2010-08-26 00:42:16 +00006949 }
Chandler Carruth629f9e42010-08-30 07:36:24 +00006950 }
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00006951 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006952
Douglas Gregor255210e2010-08-06 10:14:59 +00006953 // Handle the case of equivalent AltiVec and GCC vector types
6954 if (lhsType->isVectorType() && rhsType->isVectorType() &&
6955 Context.areCompatibleVectorTypes(lhsType, rhsType)) {
John Wiegley429bb272011-04-08 18:41:53 +00006956 lex = ImpCastExprToType(lex.take(), rhsType, CK_BitCast);
Douglas Gregor255210e2010-08-06 10:14:59 +00006957 return rhsType;
6958 }
6959
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00006960 // Canonicalize the ExtVector to the LHS, remember if we swapped so we can
6961 // swap back (so that we don't reverse the inputs to a subtract, for instance.
6962 bool swapped = false;
6963 if (rhsType->isExtVectorType()) {
6964 swapped = true;
6965 std::swap(rex, lex);
6966 std::swap(rhsType, lhsType);
6967 }
Mike Stump1eb44332009-09-09 15:08:12 +00006968
Nate Begemandde25982009-06-28 19:12:57 +00006969 // Handle the case of an ext vector and scalar.
John McCall183700f2009-09-21 23:43:11 +00006970 if (const ExtVectorType *LV = lhsType->getAs<ExtVectorType>()) {
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00006971 QualType EltTy = LV->getElementType();
Douglas Gregor9d3347a2010-06-16 00:35:25 +00006972 if (EltTy->isIntegralType(Context) && rhsType->isIntegralType(Context)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00006973 int order = Context.getIntegerTypeOrder(EltTy, rhsType);
6974 if (order > 0)
John Wiegley429bb272011-04-08 18:41:53 +00006975 rex = ImpCastExprToType(rex.take(), EltTy, CK_IntegralCast);
John McCalldaa8e4e2010-11-15 09:13:47 +00006976 if (order >= 0) {
John Wiegley429bb272011-04-08 18:41:53 +00006977 rex = ImpCastExprToType(rex.take(), lhsType, CK_VectorSplat);
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00006978 if (swapped) std::swap(rex, lex);
6979 return lhsType;
6980 }
6981 }
6982 if (EltTy->isRealFloatingType() && rhsType->isScalarType() &&
6983 rhsType->isRealFloatingType()) {
John McCalldaa8e4e2010-11-15 09:13:47 +00006984 int order = Context.getFloatingTypeOrder(EltTy, rhsType);
6985 if (order > 0)
John Wiegley429bb272011-04-08 18:41:53 +00006986 rex = ImpCastExprToType(rex.take(), EltTy, CK_FloatingCast);
John McCalldaa8e4e2010-11-15 09:13:47 +00006987 if (order >= 0) {
John Wiegley429bb272011-04-08 18:41:53 +00006988 rex = ImpCastExprToType(rex.take(), lhsType, CK_VectorSplat);
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00006989 if (swapped) std::swap(rex, lex);
6990 return lhsType;
6991 }
Nate Begeman4119d1a2007-12-30 02:59:45 +00006992 }
6993 }
Mike Stump1eb44332009-09-09 15:08:12 +00006994
Nate Begemandde25982009-06-28 19:12:57 +00006995 // Vectors of different size or scalar and non-ext-vector are errors.
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00006996 Diag(Loc, diag::err_typecheck_vector_not_convertable)
John Wiegley429bb272011-04-08 18:41:53 +00006997 << lex.get()->getType() << rex.get()->getType()
6998 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00006999 return QualType();
Sebastian Redl22460502009-02-07 00:15:38 +00007000}
7001
Chris Lattner7ef655a2010-01-12 21:23:57 +00007002QualType Sema::CheckMultiplyDivideOperands(
John Wiegley429bb272011-04-08 18:41:53 +00007003 ExprResult &lex, ExprResult &rex, SourceLocation Loc, bool isCompAssign, bool isDiv) {
7004 if (lex.get()->getType()->isVectorType() || rex.get()->getType()->isVectorType())
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007005 return CheckVectorOperands(Loc, lex, rex);
Mike Stumpeed9cac2009-02-19 03:04:26 +00007006
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00007007 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign);
John Wiegley429bb272011-04-08 18:41:53 +00007008 if (lex.isInvalid() || rex.isInvalid())
7009 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007010
John Wiegley429bb272011-04-08 18:41:53 +00007011 if (!lex.get()->getType()->isArithmeticType() ||
7012 !rex.get()->getType()->isArithmeticType())
Chris Lattner7ef655a2010-01-12 21:23:57 +00007013 return InvalidOperands(Loc, lex, rex);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007014
Chris Lattner7ef655a2010-01-12 21:23:57 +00007015 // Check for division by zero.
7016 if (isDiv &&
John Wiegley429bb272011-04-08 18:41:53 +00007017 rex.get()->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull))
7018 DiagRuntimeBehavior(Loc, rex.get(), PDiag(diag::warn_division_by_zero)
7019 << rex.get()->getSourceRange());
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007020
Chris Lattner7ef655a2010-01-12 21:23:57 +00007021 return compType;
Reid Spencer5f016e22007-07-11 17:01:13 +00007022}
7023
Chris Lattner7ef655a2010-01-12 21:23:57 +00007024QualType Sema::CheckRemainderOperands(
John Wiegley429bb272011-04-08 18:41:53 +00007025 ExprResult &lex, ExprResult &rex, SourceLocation Loc, bool isCompAssign) {
7026 if (lex.get()->getType()->isVectorType() || rex.get()->getType()->isVectorType()) {
7027 if (lex.get()->getType()->hasIntegerRepresentation() &&
7028 rex.get()->getType()->hasIntegerRepresentation())
Daniel Dunbar523aa602009-01-05 22:55:36 +00007029 return CheckVectorOperands(Loc, lex, rex);
7030 return InvalidOperands(Loc, lex, rex);
7031 }
Steve Naroff90045e82007-07-13 23:32:42 +00007032
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00007033 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign);
John Wiegley429bb272011-04-08 18:41:53 +00007034 if (lex.isInvalid() || rex.isInvalid())
7035 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007036
John Wiegley429bb272011-04-08 18:41:53 +00007037 if (!lex.get()->getType()->isIntegerType() || !rex.get()->getType()->isIntegerType())
Chris Lattner7ef655a2010-01-12 21:23:57 +00007038 return InvalidOperands(Loc, lex, rex);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007039
Chris Lattner7ef655a2010-01-12 21:23:57 +00007040 // Check for remainder by zero.
John Wiegley429bb272011-04-08 18:41:53 +00007041 if (rex.get()->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull))
7042 DiagRuntimeBehavior(Loc, rex.get(), PDiag(diag::warn_remainder_by_zero)
7043 << rex.get()->getSourceRange());
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007044
Chris Lattner7ef655a2010-01-12 21:23:57 +00007045 return compType;
Reid Spencer5f016e22007-07-11 17:01:13 +00007046}
7047
Chris Lattner7ef655a2010-01-12 21:23:57 +00007048QualType Sema::CheckAdditionOperands( // C99 6.5.6
John Wiegley429bb272011-04-08 18:41:53 +00007049 ExprResult &lex, ExprResult &rex, SourceLocation Loc, QualType* CompLHSTy) {
7050 if (lex.get()->getType()->isVectorType() || rex.get()->getType()->isVectorType()) {
Eli Friedmanab3a8522009-03-28 01:22:36 +00007051 QualType compType = CheckVectorOperands(Loc, lex, rex);
7052 if (CompLHSTy) *CompLHSTy = compType;
7053 return compType;
7054 }
Steve Naroff49b45262007-07-13 16:58:59 +00007055
Eli Friedmanab3a8522009-03-28 01:22:36 +00007056 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy);
John Wiegley429bb272011-04-08 18:41:53 +00007057 if (lex.isInvalid() || rex.isInvalid())
7058 return QualType();
Eli Friedmand72d16e2008-05-18 18:08:51 +00007059
Reid Spencer5f016e22007-07-11 17:01:13 +00007060 // handle the common case first (both operands are arithmetic).
John Wiegley429bb272011-04-08 18:41:53 +00007061 if (lex.get()->getType()->isArithmeticType() &&
7062 rex.get()->getType()->isArithmeticType()) {
Eli Friedmanab3a8522009-03-28 01:22:36 +00007063 if (CompLHSTy) *CompLHSTy = compType;
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00007064 return compType;
Eli Friedmanab3a8522009-03-28 01:22:36 +00007065 }
Reid Spencer5f016e22007-07-11 17:01:13 +00007066
Eli Friedmand72d16e2008-05-18 18:08:51 +00007067 // Put any potential pointer into PExp
John Wiegley429bb272011-04-08 18:41:53 +00007068 Expr* PExp = lex.get(), *IExp = rex.get();
Steve Naroff58f9f2c2009-07-14 18:25:06 +00007069 if (IExp->getType()->isAnyPointerType())
Eli Friedmand72d16e2008-05-18 18:08:51 +00007070 std::swap(PExp, IExp);
7071
Steve Naroff58f9f2c2009-07-14 18:25:06 +00007072 if (PExp->getType()->isAnyPointerType()) {
Mike Stump1eb44332009-09-09 15:08:12 +00007073
Eli Friedmand72d16e2008-05-18 18:08:51 +00007074 if (IExp->getType()->isIntegerType()) {
Steve Naroff760e3c42009-07-13 21:20:41 +00007075 QualType PointeeTy = PExp->getType()->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00007076
Chris Lattnerb5f15622009-04-24 23:50:08 +00007077 // Check for arithmetic on pointers to incomplete types.
7078 if (PointeeTy->isVoidType()) {
Douglas Gregore7450f52009-03-24 19:52:54 +00007079 if (getLangOptions().CPlusPlus) {
7080 Diag(Loc, diag::err_typecheck_pointer_arith_void_type)
John Wiegley429bb272011-04-08 18:41:53 +00007081 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregor4ec339f2009-01-19 19:26:10 +00007082 return QualType();
Eli Friedmand72d16e2008-05-18 18:08:51 +00007083 }
Douglas Gregore7450f52009-03-24 19:52:54 +00007084
7085 // GNU extension: arithmetic on pointer to void
7086 Diag(Loc, diag::ext_gnu_void_ptr)
John Wiegley429bb272011-04-08 18:41:53 +00007087 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Chris Lattnerb5f15622009-04-24 23:50:08 +00007088 } else if (PointeeTy->isFunctionType()) {
Douglas Gregore7450f52009-03-24 19:52:54 +00007089 if (getLangOptions().CPlusPlus) {
7090 Diag(Loc, diag::err_typecheck_pointer_arith_function_type)
John Wiegley429bb272011-04-08 18:41:53 +00007091 << lex.get()->getType() << lex.get()->getSourceRange();
Douglas Gregore7450f52009-03-24 19:52:54 +00007092 return QualType();
7093 }
7094
7095 // GNU extension: arithmetic on pointer to function
7096 Diag(Loc, diag::ext_gnu_ptr_func_arith)
John Wiegley429bb272011-04-08 18:41:53 +00007097 << lex.get()->getType() << lex.get()->getSourceRange();
Steve Naroff9deaeca2009-07-13 21:32:29 +00007098 } else {
Steve Naroff760e3c42009-07-13 21:20:41 +00007099 // Check if we require a complete type.
Mike Stump1eb44332009-09-09 15:08:12 +00007100 if (((PExp->getType()->isPointerType() &&
Steve Naroff9deaeca2009-07-13 21:32:29 +00007101 !PExp->getType()->isDependentType()) ||
Steve Naroff760e3c42009-07-13 21:20:41 +00007102 PExp->getType()->isObjCObjectPointerType()) &&
7103 RequireCompleteType(Loc, PointeeTy,
Mike Stump1eb44332009-09-09 15:08:12 +00007104 PDiag(diag::err_typecheck_arithmetic_incomplete_type)
7105 << PExp->getSourceRange()
Anders Carlssond497ba72009-08-26 22:59:12 +00007106 << PExp->getType()))
Steve Naroff760e3c42009-07-13 21:20:41 +00007107 return QualType();
7108 }
Chris Lattnerb5f15622009-04-24 23:50:08 +00007109 // Diagnose bad cases where we step over interface counts.
John McCallc12c5bb2010-05-15 11:32:37 +00007110 if (PointeeTy->isObjCObjectType() && LangOpts.ObjCNonFragileABI) {
Chris Lattnerb5f15622009-04-24 23:50:08 +00007111 Diag(Loc, diag::err_arithmetic_nonfragile_interface)
7112 << PointeeTy << PExp->getSourceRange();
7113 return QualType();
7114 }
Mike Stump1eb44332009-09-09 15:08:12 +00007115
Eli Friedmanab3a8522009-03-28 01:22:36 +00007116 if (CompLHSTy) {
John Wiegley429bb272011-04-08 18:41:53 +00007117 QualType LHSTy = Context.isPromotableBitField(lex.get());
Eli Friedman04e83572009-08-20 04:21:42 +00007118 if (LHSTy.isNull()) {
John Wiegley429bb272011-04-08 18:41:53 +00007119 LHSTy = lex.get()->getType();
Eli Friedman04e83572009-08-20 04:21:42 +00007120 if (LHSTy->isPromotableIntegerType())
7121 LHSTy = Context.getPromotedIntegerType(LHSTy);
Douglas Gregor2d833e32009-05-02 00:36:19 +00007122 }
Eli Friedmanab3a8522009-03-28 01:22:36 +00007123 *CompLHSTy = LHSTy;
7124 }
Eli Friedmand72d16e2008-05-18 18:08:51 +00007125 return PExp->getType();
7126 }
7127 }
7128
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007129 return InvalidOperands(Loc, lex, rex);
Reid Spencer5f016e22007-07-11 17:01:13 +00007130}
7131
Chris Lattnereca7be62008-04-07 05:30:13 +00007132// C99 6.5.6
John Wiegley429bb272011-04-08 18:41:53 +00007133QualType Sema::CheckSubtractionOperands(ExprResult &lex, ExprResult &rex,
Eli Friedmanab3a8522009-03-28 01:22:36 +00007134 SourceLocation Loc, QualType* CompLHSTy) {
John Wiegley429bb272011-04-08 18:41:53 +00007135 if (lex.get()->getType()->isVectorType() || rex.get()->getType()->isVectorType()) {
Eli Friedmanab3a8522009-03-28 01:22:36 +00007136 QualType compType = CheckVectorOperands(Loc, lex, rex);
7137 if (CompLHSTy) *CompLHSTy = compType;
7138 return compType;
7139 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007140
Eli Friedmanab3a8522009-03-28 01:22:36 +00007141 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy);
John Wiegley429bb272011-04-08 18:41:53 +00007142 if (lex.isInvalid() || rex.isInvalid())
7143 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007144
Chris Lattner6e4ab612007-12-09 21:53:25 +00007145 // Enforce type constraints: C99 6.5.6p3.
Mike Stumpeed9cac2009-02-19 03:04:26 +00007146
Chris Lattner6e4ab612007-12-09 21:53:25 +00007147 // Handle the common case first (both operands are arithmetic).
John Wiegley429bb272011-04-08 18:41:53 +00007148 if (lex.get()->getType()->isArithmeticType() &&
7149 rex.get()->getType()->isArithmeticType()) {
Eli Friedmanab3a8522009-03-28 01:22:36 +00007150 if (CompLHSTy) *CompLHSTy = compType;
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00007151 return compType;
Eli Friedmanab3a8522009-03-28 01:22:36 +00007152 }
Mike Stump1eb44332009-09-09 15:08:12 +00007153
Chris Lattner6e4ab612007-12-09 21:53:25 +00007154 // Either ptr - int or ptr - ptr.
John Wiegley429bb272011-04-08 18:41:53 +00007155 if (lex.get()->getType()->isAnyPointerType()) {
7156 QualType lpointee = lex.get()->getType()->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007157
Douglas Gregore7450f52009-03-24 19:52:54 +00007158 // The LHS must be an completely-defined object type.
Douglas Gregorc983b862009-01-23 00:36:41 +00007159
Douglas Gregore7450f52009-03-24 19:52:54 +00007160 bool ComplainAboutVoid = false;
7161 Expr *ComplainAboutFunc = 0;
7162 if (lpointee->isVoidType()) {
7163 if (getLangOptions().CPlusPlus) {
7164 Diag(Loc, diag::err_typecheck_pointer_arith_void_type)
John Wiegley429bb272011-04-08 18:41:53 +00007165 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregore7450f52009-03-24 19:52:54 +00007166 return QualType();
7167 }
7168
7169 // GNU C extension: arithmetic on pointer to void
7170 ComplainAboutVoid = true;
7171 } else if (lpointee->isFunctionType()) {
7172 if (getLangOptions().CPlusPlus) {
7173 Diag(Loc, diag::err_typecheck_pointer_arith_function_type)
John Wiegley429bb272011-04-08 18:41:53 +00007174 << lex.get()->getType() << lex.get()->getSourceRange();
Chris Lattner6e4ab612007-12-09 21:53:25 +00007175 return QualType();
7176 }
Douglas Gregore7450f52009-03-24 19:52:54 +00007177
7178 // GNU C extension: arithmetic on pointer to function
John Wiegley429bb272011-04-08 18:41:53 +00007179 ComplainAboutFunc = lex.get();
Douglas Gregore7450f52009-03-24 19:52:54 +00007180 } else if (!lpointee->isDependentType() &&
Mike Stump1eb44332009-09-09 15:08:12 +00007181 RequireCompleteType(Loc, lpointee,
Anders Carlssond497ba72009-08-26 22:59:12 +00007182 PDiag(diag::err_typecheck_sub_ptr_object)
John Wiegley429bb272011-04-08 18:41:53 +00007183 << lex.get()->getSourceRange()
7184 << lex.get()->getType()))
Douglas Gregore7450f52009-03-24 19:52:54 +00007185 return QualType();
Chris Lattner6e4ab612007-12-09 21:53:25 +00007186
Chris Lattnerb5f15622009-04-24 23:50:08 +00007187 // Diagnose bad cases where we step over interface counts.
John McCallc12c5bb2010-05-15 11:32:37 +00007188 if (lpointee->isObjCObjectType() && LangOpts.ObjCNonFragileABI) {
Chris Lattnerb5f15622009-04-24 23:50:08 +00007189 Diag(Loc, diag::err_arithmetic_nonfragile_interface)
John Wiegley429bb272011-04-08 18:41:53 +00007190 << lpointee << lex.get()->getSourceRange();
Chris Lattnerb5f15622009-04-24 23:50:08 +00007191 return QualType();
7192 }
Mike Stump1eb44332009-09-09 15:08:12 +00007193
Chris Lattner6e4ab612007-12-09 21:53:25 +00007194 // The result type of a pointer-int computation is the pointer type.
John Wiegley429bb272011-04-08 18:41:53 +00007195 if (rex.get()->getType()->isIntegerType()) {
Douglas Gregore7450f52009-03-24 19:52:54 +00007196 if (ComplainAboutVoid)
7197 Diag(Loc, diag::ext_gnu_void_ptr)
John Wiegley429bb272011-04-08 18:41:53 +00007198 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregore7450f52009-03-24 19:52:54 +00007199 if (ComplainAboutFunc)
7200 Diag(Loc, diag::ext_gnu_ptr_func_arith)
Mike Stump1eb44332009-09-09 15:08:12 +00007201 << ComplainAboutFunc->getType()
Douglas Gregore7450f52009-03-24 19:52:54 +00007202 << ComplainAboutFunc->getSourceRange();
7203
John Wiegley429bb272011-04-08 18:41:53 +00007204 if (CompLHSTy) *CompLHSTy = lex.get()->getType();
7205 return lex.get()->getType();
Douglas Gregore7450f52009-03-24 19:52:54 +00007206 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007207
Chris Lattner6e4ab612007-12-09 21:53:25 +00007208 // Handle pointer-pointer subtractions.
John Wiegley429bb272011-04-08 18:41:53 +00007209 if (const PointerType *RHSPTy = rex.get()->getType()->getAs<PointerType>()) {
Eli Friedman8e54ad02008-02-08 01:19:44 +00007210 QualType rpointee = RHSPTy->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007211
Douglas Gregore7450f52009-03-24 19:52:54 +00007212 // RHS must be a completely-type object type.
7213 // Handle the GNU void* extension.
7214 if (rpointee->isVoidType()) {
7215 if (getLangOptions().CPlusPlus) {
7216 Diag(Loc, diag::err_typecheck_pointer_arith_void_type)
John Wiegley429bb272011-04-08 18:41:53 +00007217 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregore7450f52009-03-24 19:52:54 +00007218 return QualType();
7219 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007220
Douglas Gregore7450f52009-03-24 19:52:54 +00007221 ComplainAboutVoid = true;
7222 } else if (rpointee->isFunctionType()) {
7223 if (getLangOptions().CPlusPlus) {
7224 Diag(Loc, diag::err_typecheck_pointer_arith_function_type)
John Wiegley429bb272011-04-08 18:41:53 +00007225 << rex.get()->getType() << rex.get()->getSourceRange();
Chris Lattner6e4ab612007-12-09 21:53:25 +00007226 return QualType();
7227 }
Douglas Gregore7450f52009-03-24 19:52:54 +00007228
7229 // GNU extension: arithmetic on pointer to function
7230 if (!ComplainAboutFunc)
John Wiegley429bb272011-04-08 18:41:53 +00007231 ComplainAboutFunc = rex.get();
Douglas Gregore7450f52009-03-24 19:52:54 +00007232 } else if (!rpointee->isDependentType() &&
7233 RequireCompleteType(Loc, rpointee,
Anders Carlssond497ba72009-08-26 22:59:12 +00007234 PDiag(diag::err_typecheck_sub_ptr_object)
John Wiegley429bb272011-04-08 18:41:53 +00007235 << rex.get()->getSourceRange()
7236 << rex.get()->getType()))
Douglas Gregore7450f52009-03-24 19:52:54 +00007237 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007238
Eli Friedman88d936b2009-05-16 13:54:38 +00007239 if (getLangOptions().CPlusPlus) {
7240 // Pointee types must be the same: C++ [expr.add]
7241 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) {
7242 Diag(Loc, diag::err_typecheck_sub_ptr_compatible)
John Wiegley429bb272011-04-08 18:41:53 +00007243 << lex.get()->getType() << rex.get()->getType()
7244 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Eli Friedman88d936b2009-05-16 13:54:38 +00007245 return QualType();
7246 }
7247 } else {
7248 // Pointee types must be compatible C99 6.5.6p3
7249 if (!Context.typesAreCompatible(
7250 Context.getCanonicalType(lpointee).getUnqualifiedType(),
7251 Context.getCanonicalType(rpointee).getUnqualifiedType())) {
7252 Diag(Loc, diag::err_typecheck_sub_ptr_compatible)
John Wiegley429bb272011-04-08 18:41:53 +00007253 << lex.get()->getType() << rex.get()->getType()
7254 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Eli Friedman88d936b2009-05-16 13:54:38 +00007255 return QualType();
7256 }
Chris Lattner6e4ab612007-12-09 21:53:25 +00007257 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007258
Douglas Gregore7450f52009-03-24 19:52:54 +00007259 if (ComplainAboutVoid)
7260 Diag(Loc, diag::ext_gnu_void_ptr)
John Wiegley429bb272011-04-08 18:41:53 +00007261 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregore7450f52009-03-24 19:52:54 +00007262 if (ComplainAboutFunc)
7263 Diag(Loc, diag::ext_gnu_ptr_func_arith)
Mike Stump1eb44332009-09-09 15:08:12 +00007264 << ComplainAboutFunc->getType()
Douglas Gregore7450f52009-03-24 19:52:54 +00007265 << ComplainAboutFunc->getSourceRange();
Eli Friedmanab3a8522009-03-28 01:22:36 +00007266
John Wiegley429bb272011-04-08 18:41:53 +00007267 if (CompLHSTy) *CompLHSTy = lex.get()->getType();
Chris Lattner6e4ab612007-12-09 21:53:25 +00007268 return Context.getPointerDiffType();
7269 }
7270 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007271
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007272 return InvalidOperands(Loc, lex, rex);
Reid Spencer5f016e22007-07-11 17:01:13 +00007273}
7274
Douglas Gregor1274ccd2010-10-08 23:50:27 +00007275static bool isScopedEnumerationType(QualType T) {
7276 if (const EnumType *ET = dyn_cast<EnumType>(T))
7277 return ET->getDecl()->isScoped();
7278 return false;
7279}
7280
John Wiegley429bb272011-04-08 18:41:53 +00007281static void DiagnoseBadShiftValues(Sema& S, ExprResult &lex, ExprResult &rex,
Chandler Carruth21206d52011-02-23 23:34:11 +00007282 SourceLocation Loc, unsigned Opc,
7283 QualType LHSTy) {
7284 llvm::APSInt Right;
7285 // Check right/shifter operand
John Wiegley429bb272011-04-08 18:41:53 +00007286 if (rex.get()->isValueDependent() || !rex.get()->isIntegerConstantExpr(Right, S.Context))
Chandler Carruth21206d52011-02-23 23:34:11 +00007287 return;
7288
7289 if (Right.isNegative()) {
John Wiegley429bb272011-04-08 18:41:53 +00007290 S.DiagRuntimeBehavior(Loc, rex.get(),
Ted Kremenek082bf7a2011-03-01 18:09:31 +00007291 S.PDiag(diag::warn_shift_negative)
John Wiegley429bb272011-04-08 18:41:53 +00007292 << rex.get()->getSourceRange());
Chandler Carruth21206d52011-02-23 23:34:11 +00007293 return;
7294 }
7295 llvm::APInt LeftBits(Right.getBitWidth(),
John Wiegley429bb272011-04-08 18:41:53 +00007296 S.Context.getTypeSize(lex.get()->getType()));
Chandler Carruth21206d52011-02-23 23:34:11 +00007297 if (Right.uge(LeftBits)) {
John Wiegley429bb272011-04-08 18:41:53 +00007298 S.DiagRuntimeBehavior(Loc, rex.get(),
Ted Kremenek425a31e2011-03-01 19:13:22 +00007299 S.PDiag(diag::warn_shift_gt_typewidth)
John Wiegley429bb272011-04-08 18:41:53 +00007300 << rex.get()->getSourceRange());
Chandler Carruth21206d52011-02-23 23:34:11 +00007301 return;
7302 }
7303 if (Opc != BO_Shl)
7304 return;
7305
7306 // When left shifting an ICE which is signed, we can check for overflow which
7307 // according to C++ has undefined behavior ([expr.shift] 5.8/2). Unsigned
7308 // integers have defined behavior modulo one more than the maximum value
7309 // representable in the result type, so never warn for those.
7310 llvm::APSInt Left;
John Wiegley429bb272011-04-08 18:41:53 +00007311 if (lex.get()->isValueDependent() || !lex.get()->isIntegerConstantExpr(Left, S.Context) ||
Chandler Carruth21206d52011-02-23 23:34:11 +00007312 LHSTy->hasUnsignedIntegerRepresentation())
7313 return;
7314 llvm::APInt ResultBits =
7315 static_cast<llvm::APInt&>(Right) + Left.getMinSignedBits();
7316 if (LeftBits.uge(ResultBits))
7317 return;
7318 llvm::APSInt Result = Left.extend(ResultBits.getLimitedValue());
7319 Result = Result.shl(Right);
7320
7321 // If we are only missing a sign bit, this is less likely to result in actual
7322 // bugs -- if the result is cast back to an unsigned type, it will have the
7323 // expected value. Thus we place this behind a different warning that can be
7324 // turned off separately if needed.
7325 if (LeftBits == ResultBits - 1) {
7326 S.Diag(Loc, diag::warn_shift_result_overrides_sign_bit)
7327 << Result.toString(10) << LHSTy
John Wiegley429bb272011-04-08 18:41:53 +00007328 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Chandler Carruth21206d52011-02-23 23:34:11 +00007329 return;
7330 }
7331
7332 S.Diag(Loc, diag::warn_shift_result_gt_typewidth)
7333 << Result.toString(10) << Result.getMinSignedBits() << LHSTy
John Wiegley429bb272011-04-08 18:41:53 +00007334 << Left.getBitWidth() << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Chandler Carruth21206d52011-02-23 23:34:11 +00007335}
7336
Chris Lattnereca7be62008-04-07 05:30:13 +00007337// C99 6.5.7
John Wiegley429bb272011-04-08 18:41:53 +00007338QualType Sema::CheckShiftOperands(ExprResult &lex, ExprResult &rex, SourceLocation Loc,
Chandler Carruth21206d52011-02-23 23:34:11 +00007339 unsigned Opc, bool isCompAssign) {
Chris Lattnerca5eede2007-12-12 05:47:28 +00007340 // C99 6.5.7p2: Each of the operands shall have integer type.
John Wiegley429bb272011-04-08 18:41:53 +00007341 if (!lex.get()->getType()->hasIntegerRepresentation() ||
7342 !rex.get()->getType()->hasIntegerRepresentation())
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007343 return InvalidOperands(Loc, lex, rex);
Mike Stumpeed9cac2009-02-19 03:04:26 +00007344
Douglas Gregor1274ccd2010-10-08 23:50:27 +00007345 // C++0x: Don't allow scoped enums. FIXME: Use something better than
7346 // hasIntegerRepresentation() above instead of this.
John Wiegley429bb272011-04-08 18:41:53 +00007347 if (isScopedEnumerationType(lex.get()->getType()) ||
7348 isScopedEnumerationType(rex.get()->getType())) {
Douglas Gregor1274ccd2010-10-08 23:50:27 +00007349 return InvalidOperands(Loc, lex, rex);
7350 }
7351
Nate Begeman2207d792009-10-25 02:26:48 +00007352 // Vector shifts promote their scalar inputs to vector type.
John Wiegley429bb272011-04-08 18:41:53 +00007353 if (lex.get()->getType()->isVectorType() || rex.get()->getType()->isVectorType())
Nate Begeman2207d792009-10-25 02:26:48 +00007354 return CheckVectorOperands(Loc, lex, rex);
7355
Chris Lattnerca5eede2007-12-12 05:47:28 +00007356 // Shifts don't perform usual arithmetic conversions, they just do integer
7357 // promotions on each operand. C99 6.5.7p3
Eli Friedmanab3a8522009-03-28 01:22:36 +00007358
John McCall1bc80af2010-12-16 19:28:59 +00007359 // For the LHS, do usual unary conversions, but then reset them away
7360 // if this is a compound assignment.
John Wiegley429bb272011-04-08 18:41:53 +00007361 ExprResult old_lex = lex;
7362 lex = UsualUnaryConversions(lex.take());
7363 if (lex.isInvalid())
7364 return QualType();
7365 QualType LHSTy = lex.get()->getType();
John McCall1bc80af2010-12-16 19:28:59 +00007366 if (isCompAssign) lex = old_lex;
7367
7368 // The RHS is simpler.
John Wiegley429bb272011-04-08 18:41:53 +00007369 rex = UsualUnaryConversions(rex.take());
7370 if (rex.isInvalid())
7371 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007372
Ryan Flynnd0439682009-08-07 16:20:20 +00007373 // Sanity-check shift operands
Chandler Carruth21206d52011-02-23 23:34:11 +00007374 DiagnoseBadShiftValues(*this, lex, rex, Loc, Opc, LHSTy);
Ryan Flynnd0439682009-08-07 16:20:20 +00007375
Chris Lattnerca5eede2007-12-12 05:47:28 +00007376 // "The type of the result is that of the promoted left operand."
Eli Friedmanab3a8522009-03-28 01:22:36 +00007377 return LHSTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00007378}
7379
Chandler Carruth99919472010-07-10 12:30:03 +00007380static bool IsWithinTemplateSpecialization(Decl *D) {
7381 if (DeclContext *DC = D->getDeclContext()) {
7382 if (isa<ClassTemplateSpecializationDecl>(DC))
7383 return true;
7384 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(DC))
7385 return FD->isFunctionTemplateSpecialization();
7386 }
7387 return false;
7388}
7389
Douglas Gregor0c6db942009-05-04 06:07:12 +00007390// C99 6.5.8, C++ [expr.rel]
John Wiegley429bb272011-04-08 18:41:53 +00007391QualType Sema::CheckCompareOperands(ExprResult &lex, ExprResult &rex, SourceLocation Loc,
Douglas Gregora86b8322009-04-06 18:45:53 +00007392 unsigned OpaqueOpc, bool isRelational) {
John McCall2de56d12010-08-25 11:45:40 +00007393 BinaryOperatorKind Opc = (BinaryOperatorKind) OpaqueOpc;
Douglas Gregora86b8322009-04-06 18:45:53 +00007394
Chris Lattner02dd4b12009-12-05 05:40:13 +00007395 // Handle vector comparisons separately.
John Wiegley429bb272011-04-08 18:41:53 +00007396 if (lex.get()->getType()->isVectorType() || rex.get()->getType()->isVectorType())
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007397 return CheckVectorCompareOperands(lex, rex, Loc, isRelational);
Mike Stumpeed9cac2009-02-19 03:04:26 +00007398
John Wiegley429bb272011-04-08 18:41:53 +00007399 QualType lType = lex.get()->getType();
7400 QualType rType = rex.get()->getType();
Douglas Gregorfadb53b2011-03-12 01:48:56 +00007401
John Wiegley429bb272011-04-08 18:41:53 +00007402 Expr *LHSStripped = lex.get()->IgnoreParenImpCasts();
7403 Expr *RHSStripped = rex.get()->IgnoreParenImpCasts();
Chandler Carruth543cb652011-02-17 08:37:06 +00007404 QualType LHSStrippedType = LHSStripped->getType();
7405 QualType RHSStrippedType = RHSStripped->getType();
7406
Douglas Gregorfadb53b2011-03-12 01:48:56 +00007407
7408
Chandler Carruth543cb652011-02-17 08:37:06 +00007409 // Two different enums will raise a warning when compared.
7410 if (const EnumType *LHSEnumType = LHSStrippedType->getAs<EnumType>()) {
7411 if (const EnumType *RHSEnumType = RHSStrippedType->getAs<EnumType>()) {
7412 if (LHSEnumType->getDecl()->getIdentifier() &&
7413 RHSEnumType->getDecl()->getIdentifier() &&
7414 !Context.hasSameUnqualifiedType(LHSStrippedType, RHSStrippedType)) {
7415 Diag(Loc, diag::warn_comparison_of_mixed_enum_types)
7416 << LHSStrippedType << RHSStrippedType
John Wiegley429bb272011-04-08 18:41:53 +00007417 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Chandler Carruth543cb652011-02-17 08:37:06 +00007418 }
7419 }
7420 }
7421
Douglas Gregor8eee1192010-06-22 22:12:46 +00007422 if (!lType->hasFloatingRepresentation() &&
Ted Kremenekfbcb0eb2010-09-16 00:03:01 +00007423 !(lType->isBlockPointerType() && isRelational) &&
John Wiegley429bb272011-04-08 18:41:53 +00007424 !lex.get()->getLocStart().isMacroID() &&
7425 !rex.get()->getLocStart().isMacroID()) {
Chris Lattner55660a72009-03-08 19:39:53 +00007426 // For non-floating point types, check for self-comparisons of the form
7427 // x == x, x != x, x < x, etc. These always evaluate to a constant, and
7428 // often indicate logic errors in the program.
Chandler Carruth64d092c2010-07-12 06:23:38 +00007429 //
7430 // NOTE: Don't warn about comparison expressions resulting from macro
7431 // expansion. Also don't warn about comparisons which are only self
7432 // comparisons within a template specialization. The warnings should catch
7433 // obvious cases in the definition of the template anyways. The idea is to
7434 // warn when the typed comparison operator will always evaluate to the same
7435 // result.
Chandler Carruth99919472010-07-10 12:30:03 +00007436 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) {
Douglas Gregord64fdd02010-06-08 19:50:34 +00007437 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) {
Ted Kremenekfbcb0eb2010-09-16 00:03:01 +00007438 if (DRL->getDecl() == DRR->getDecl() &&
Chandler Carruth99919472010-07-10 12:30:03 +00007439 !IsWithinTemplateSpecialization(DRL->getDecl())) {
Ted Kremenek351ba912011-02-23 01:52:04 +00007440 DiagRuntimeBehavior(Loc, 0, PDiag(diag::warn_comparison_always)
Douglas Gregord64fdd02010-06-08 19:50:34 +00007441 << 0 // self-
John McCall2de56d12010-08-25 11:45:40 +00007442 << (Opc == BO_EQ
7443 || Opc == BO_LE
7444 || Opc == BO_GE));
Douglas Gregord64fdd02010-06-08 19:50:34 +00007445 } else if (lType->isArrayType() && rType->isArrayType() &&
7446 !DRL->getDecl()->getType()->isReferenceType() &&
7447 !DRR->getDecl()->getType()->isReferenceType()) {
7448 // what is it always going to eval to?
7449 char always_evals_to;
7450 switch(Opc) {
John McCall2de56d12010-08-25 11:45:40 +00007451 case BO_EQ: // e.g. array1 == array2
Douglas Gregord64fdd02010-06-08 19:50:34 +00007452 always_evals_to = 0; // false
7453 break;
John McCall2de56d12010-08-25 11:45:40 +00007454 case BO_NE: // e.g. array1 != array2
Douglas Gregord64fdd02010-06-08 19:50:34 +00007455 always_evals_to = 1; // true
7456 break;
7457 default:
7458 // best we can say is 'a constant'
7459 always_evals_to = 2; // e.g. array1 <= array2
7460 break;
7461 }
Ted Kremenek351ba912011-02-23 01:52:04 +00007462 DiagRuntimeBehavior(Loc, 0, PDiag(diag::warn_comparison_always)
Douglas Gregord64fdd02010-06-08 19:50:34 +00007463 << 1 // array
7464 << always_evals_to);
7465 }
7466 }
Chandler Carruth99919472010-07-10 12:30:03 +00007467 }
Mike Stump1eb44332009-09-09 15:08:12 +00007468
Chris Lattner55660a72009-03-08 19:39:53 +00007469 if (isa<CastExpr>(LHSStripped))
7470 LHSStripped = LHSStripped->IgnoreParenCasts();
7471 if (isa<CastExpr>(RHSStripped))
7472 RHSStripped = RHSStripped->IgnoreParenCasts();
Mike Stump1eb44332009-09-09 15:08:12 +00007473
Chris Lattner55660a72009-03-08 19:39:53 +00007474 // Warn about comparisons against a string constant (unless the other
7475 // operand is null), the user probably wants strcmp.
Douglas Gregora86b8322009-04-06 18:45:53 +00007476 Expr *literalString = 0;
7477 Expr *literalStringStripped = 0;
Chris Lattner55660a72009-03-08 19:39:53 +00007478 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) &&
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007479 !RHSStripped->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00007480 Expr::NPC_ValueDependentIsNull)) {
John Wiegley429bb272011-04-08 18:41:53 +00007481 literalString = lex.get();
Douglas Gregora86b8322009-04-06 18:45:53 +00007482 literalStringStripped = LHSStripped;
Mike Stumpac5fc7c2009-08-04 21:02:39 +00007483 } else if ((isa<StringLiteral>(RHSStripped) ||
7484 isa<ObjCEncodeExpr>(RHSStripped)) &&
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007485 !LHSStripped->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00007486 Expr::NPC_ValueDependentIsNull)) {
John Wiegley429bb272011-04-08 18:41:53 +00007487 literalString = rex.get();
Douglas Gregora86b8322009-04-06 18:45:53 +00007488 literalStringStripped = RHSStripped;
7489 }
7490
7491 if (literalString) {
7492 std::string resultComparison;
7493 switch (Opc) {
John McCall2de56d12010-08-25 11:45:40 +00007494 case BO_LT: resultComparison = ") < 0"; break;
7495 case BO_GT: resultComparison = ") > 0"; break;
7496 case BO_LE: resultComparison = ") <= 0"; break;
7497 case BO_GE: resultComparison = ") >= 0"; break;
7498 case BO_EQ: resultComparison = ") == 0"; break;
7499 case BO_NE: resultComparison = ") != 0"; break;
Douglas Gregora86b8322009-04-06 18:45:53 +00007500 default: assert(false && "Invalid comparison operator");
7501 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007502
Ted Kremenek351ba912011-02-23 01:52:04 +00007503 DiagRuntimeBehavior(Loc, 0,
Douglas Gregord1e4d9b2010-01-12 23:18:54 +00007504 PDiag(diag::warn_stringcompare)
7505 << isa<ObjCEncodeExpr>(literalStringStripped)
Ted Kremenek03a4bee2010-04-09 20:26:53 +00007506 << literalString->getSourceRange());
Douglas Gregora86b8322009-04-06 18:45:53 +00007507 }
Ted Kremenek3ca0bf22007-10-29 16:58:49 +00007508 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007509
Douglas Gregord64fdd02010-06-08 19:50:34 +00007510 // C99 6.5.8p3 / C99 6.5.9p4
John Wiegley429bb272011-04-08 18:41:53 +00007511 if (lex.get()->getType()->isArithmeticType() && rex.get()->getType()->isArithmeticType()) {
Douglas Gregord64fdd02010-06-08 19:50:34 +00007512 UsualArithmeticConversions(lex, rex);
John Wiegley429bb272011-04-08 18:41:53 +00007513 if (lex.isInvalid() || rex.isInvalid())
7514 return QualType();
7515 }
Douglas Gregord64fdd02010-06-08 19:50:34 +00007516 else {
John Wiegley429bb272011-04-08 18:41:53 +00007517 lex = UsualUnaryConversions(lex.take());
7518 if (lex.isInvalid())
7519 return QualType();
7520
7521 rex = UsualUnaryConversions(rex.take());
7522 if (rex.isInvalid())
7523 return QualType();
Douglas Gregord64fdd02010-06-08 19:50:34 +00007524 }
7525
John Wiegley429bb272011-04-08 18:41:53 +00007526 lType = lex.get()->getType();
7527 rType = rex.get()->getType();
Douglas Gregord64fdd02010-06-08 19:50:34 +00007528
Douglas Gregor447b69e2008-11-19 03:25:36 +00007529 // The result of comparisons is 'bool' in C++, 'int' in C.
Argyrios Kyrtzidis16f744b2011-02-18 20:55:15 +00007530 QualType ResultTy = Context.getLogicalOperationType();
Douglas Gregor447b69e2008-11-19 03:25:36 +00007531
Chris Lattnera5937dd2007-08-26 01:18:55 +00007532 if (isRelational) {
7533 if (lType->isRealType() && rType->isRealType())
Douglas Gregor447b69e2008-11-19 03:25:36 +00007534 return ResultTy;
Chris Lattnera5937dd2007-08-26 01:18:55 +00007535 } else {
Ted Kremenek72cb1ae2007-10-29 17:13:39 +00007536 // Check for comparisons of floating point operands using != and ==.
Douglas Gregor8eee1192010-06-22 22:12:46 +00007537 if (lType->hasFloatingRepresentation())
John Wiegley429bb272011-04-08 18:41:53 +00007538 CheckFloatComparison(Loc, lex.get(), rex.get());
Mike Stumpeed9cac2009-02-19 03:04:26 +00007539
Chris Lattnera5937dd2007-08-26 01:18:55 +00007540 if (lType->isArithmeticType() && rType->isArithmeticType())
Douglas Gregor447b69e2008-11-19 03:25:36 +00007541 return ResultTy;
Chris Lattnera5937dd2007-08-26 01:18:55 +00007542 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007543
John Wiegley429bb272011-04-08 18:41:53 +00007544 bool LHSIsNull = lex.get()->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00007545 Expr::NPC_ValueDependentIsNull);
John Wiegley429bb272011-04-08 18:41:53 +00007546 bool RHSIsNull = rex.get()->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00007547 Expr::NPC_ValueDependentIsNull);
Mike Stumpeed9cac2009-02-19 03:04:26 +00007548
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007549 // All of the following pointer-related warnings are GCC extensions, except
7550 // when handling null pointer constants.
Steve Naroff77878cc2007-08-27 04:08:11 +00007551 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2
Chris Lattnerbc896f52008-04-03 05:07:25 +00007552 QualType LCanPointeeTy =
Ted Kremenek6217b802009-07-29 21:53:49 +00007553 Context.getCanonicalType(lType->getAs<PointerType>()->getPointeeType());
Chris Lattnerbc896f52008-04-03 05:07:25 +00007554 QualType RCanPointeeTy =
Ted Kremenek6217b802009-07-29 21:53:49 +00007555 Context.getCanonicalType(rType->getAs<PointerType>()->getPointeeType());
Mike Stumpeed9cac2009-02-19 03:04:26 +00007556
Douglas Gregor0c6db942009-05-04 06:07:12 +00007557 if (getLangOptions().CPlusPlus) {
Eli Friedman3075e762009-08-23 00:27:47 +00007558 if (LCanPointeeTy == RCanPointeeTy)
7559 return ResultTy;
Fariborz Jahanian51874dd2009-12-21 18:19:17 +00007560 if (!isRelational &&
7561 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) {
7562 // Valid unless comparison between non-null pointer and function pointer
7563 // This is a gcc extension compatibility comparison.
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007564 // In a SFINAE context, we treat this as a hard error to maintain
7565 // conformance with the C++ standard.
Fariborz Jahanian51874dd2009-12-21 18:19:17 +00007566 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType())
7567 && !LHSIsNull && !RHSIsNull) {
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007568 Diag(Loc,
7569 isSFINAEContext()?
7570 diag::err_typecheck_comparison_of_fptr_to_void
7571 : diag::ext_typecheck_comparison_of_fptr_to_void)
John Wiegley429bb272011-04-08 18:41:53 +00007572 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007573
7574 if (isSFINAEContext())
7575 return QualType();
7576
John Wiegley429bb272011-04-08 18:41:53 +00007577 rex = ImpCastExprToType(rex.take(), lType, CK_BitCast);
Fariborz Jahanian51874dd2009-12-21 18:19:17 +00007578 return ResultTy;
7579 }
7580 }
Anders Carlsson0c8209e2010-11-04 03:17:43 +00007581
Douglas Gregor0c6db942009-05-04 06:07:12 +00007582 // C++ [expr.rel]p2:
7583 // [...] Pointer conversions (4.10) and qualification
7584 // conversions (4.4) are performed on pointer operands (or on
7585 // a pointer operand and a null pointer constant) to bring
7586 // them to their composite pointer type. [...]
7587 //
Douglas Gregor20b3e992009-08-24 17:42:35 +00007588 // C++ [expr.eq]p1 uses the same notion for (in)equality
Douglas Gregor0c6db942009-05-04 06:07:12 +00007589 // comparisons of pointers.
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00007590 bool NonStandardCompositeType = false;
Douglas Gregor8f00dcf2010-04-16 23:20:25 +00007591 QualType T = FindCompositePointerType(Loc, lex, rex,
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00007592 isSFINAEContext()? 0 : &NonStandardCompositeType);
Douglas Gregor0c6db942009-05-04 06:07:12 +00007593 if (T.isNull()) {
7594 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers)
John Wiegley429bb272011-04-08 18:41:53 +00007595 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregor0c6db942009-05-04 06:07:12 +00007596 return QualType();
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00007597 } else if (NonStandardCompositeType) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007598 Diag(Loc,
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00007599 diag::ext_typecheck_comparison_of_distinct_pointers_nonstandard)
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007600 << lType << rType << T
John Wiegley429bb272011-04-08 18:41:53 +00007601 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregor0c6db942009-05-04 06:07:12 +00007602 }
7603
John Wiegley429bb272011-04-08 18:41:53 +00007604 lex = ImpCastExprToType(lex.take(), T, CK_BitCast);
7605 rex = ImpCastExprToType(rex.take(), T, CK_BitCast);
Douglas Gregor0c6db942009-05-04 06:07:12 +00007606 return ResultTy;
7607 }
Eli Friedman3075e762009-08-23 00:27:47 +00007608 // C99 6.5.9p2 and C99 6.5.8p2
7609 if (Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(),
7610 RCanPointeeTy.getUnqualifiedType())) {
7611 // Valid unless a relational comparison of function pointers
7612 if (isRelational && LCanPointeeTy->isFunctionType()) {
7613 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers)
John Wiegley429bb272011-04-08 18:41:53 +00007614 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Eli Friedman3075e762009-08-23 00:27:47 +00007615 }
7616 } else if (!isRelational &&
7617 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) {
7618 // Valid unless comparison between non-null pointer and function pointer
7619 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType())
7620 && !LHSIsNull && !RHSIsNull) {
7621 Diag(Loc, diag::ext_typecheck_comparison_of_fptr_to_void)
John Wiegley429bb272011-04-08 18:41:53 +00007622 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Eli Friedman3075e762009-08-23 00:27:47 +00007623 }
7624 } else {
7625 // Invalid
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00007626 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers)
John Wiegley429bb272011-04-08 18:41:53 +00007627 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00007628 }
John McCall34d6f932011-03-11 04:25:25 +00007629 if (LCanPointeeTy != RCanPointeeTy) {
7630 if (LHSIsNull && !RHSIsNull)
John Wiegley429bb272011-04-08 18:41:53 +00007631 lex = ImpCastExprToType(lex.take(), rType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00007632 else
John Wiegley429bb272011-04-08 18:41:53 +00007633 rex = ImpCastExprToType(rex.take(), lType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00007634 }
Douglas Gregor447b69e2008-11-19 03:25:36 +00007635 return ResultTy;
Steve Naroffe77fd3c2007-08-16 21:48:38 +00007636 }
Mike Stump1eb44332009-09-09 15:08:12 +00007637
Sebastian Redl6e8ed162009-05-10 18:38:11 +00007638 if (getLangOptions().CPlusPlus) {
Anders Carlsson0c8209e2010-11-04 03:17:43 +00007639 // Comparison of nullptr_t with itself.
7640 if (lType->isNullPtrType() && rType->isNullPtrType())
7641 return ResultTy;
7642
Mike Stump1eb44332009-09-09 15:08:12 +00007643 // Comparison of pointers with null pointer constants and equality
Douglas Gregor20b3e992009-08-24 17:42:35 +00007644 // comparisons of member pointers to null pointer constants.
Mike Stump1eb44332009-09-09 15:08:12 +00007645 if (RHSIsNull &&
Douglas Gregor17e37c72011-06-01 15:12:24 +00007646 ((lType->isAnyPointerType() || lType->isNullPtrType()) ||
Douglas Gregor20b3e992009-08-24 17:42:35 +00007647 (!isRelational && lType->isMemberPointerType()))) {
John Wiegley429bb272011-04-08 18:41:53 +00007648 rex = ImpCastExprToType(rex.take(), lType,
Douglas Gregor443c2122010-08-07 13:36:37 +00007649 lType->isMemberPointerType()
John McCall2de56d12010-08-25 11:45:40 +00007650 ? CK_NullToMemberPointer
John McCall404cd162010-11-13 01:35:44 +00007651 : CK_NullToPointer);
Sebastian Redl6e8ed162009-05-10 18:38:11 +00007652 return ResultTy;
7653 }
Douglas Gregor20b3e992009-08-24 17:42:35 +00007654 if (LHSIsNull &&
Douglas Gregor17e37c72011-06-01 15:12:24 +00007655 ((rType->isAnyPointerType() || rType->isNullPtrType()) ||
Douglas Gregor20b3e992009-08-24 17:42:35 +00007656 (!isRelational && rType->isMemberPointerType()))) {
John Wiegley429bb272011-04-08 18:41:53 +00007657 lex = ImpCastExprToType(lex.take(), rType,
Douglas Gregor443c2122010-08-07 13:36:37 +00007658 rType->isMemberPointerType()
John McCall2de56d12010-08-25 11:45:40 +00007659 ? CK_NullToMemberPointer
John McCall404cd162010-11-13 01:35:44 +00007660 : CK_NullToPointer);
Sebastian Redl6e8ed162009-05-10 18:38:11 +00007661 return ResultTy;
7662 }
Douglas Gregor20b3e992009-08-24 17:42:35 +00007663
7664 // Comparison of member pointers.
Mike Stump1eb44332009-09-09 15:08:12 +00007665 if (!isRelational &&
Douglas Gregor20b3e992009-08-24 17:42:35 +00007666 lType->isMemberPointerType() && rType->isMemberPointerType()) {
7667 // C++ [expr.eq]p2:
Mike Stump1eb44332009-09-09 15:08:12 +00007668 // In addition, pointers to members can be compared, or a pointer to
7669 // member and a null pointer constant. Pointer to member conversions
7670 // (4.11) and qualification conversions (4.4) are performed to bring
7671 // them to a common type. If one operand is a null pointer constant,
7672 // the common type is the type of the other operand. Otherwise, the
7673 // common type is a pointer to member type similar (4.4) to the type
7674 // of one of the operands, with a cv-qualification signature (4.4)
7675 // that is the union of the cv-qualification signatures of the operand
Douglas Gregor20b3e992009-08-24 17:42:35 +00007676 // types.
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00007677 bool NonStandardCompositeType = false;
Douglas Gregor8f00dcf2010-04-16 23:20:25 +00007678 QualType T = FindCompositePointerType(Loc, lex, rex,
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00007679 isSFINAEContext()? 0 : &NonStandardCompositeType);
Douglas Gregor20b3e992009-08-24 17:42:35 +00007680 if (T.isNull()) {
7681 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers)
John Wiegley429bb272011-04-08 18:41:53 +00007682 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregor20b3e992009-08-24 17:42:35 +00007683 return QualType();
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00007684 } else if (NonStandardCompositeType) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007685 Diag(Loc,
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00007686 diag::ext_typecheck_comparison_of_distinct_pointers_nonstandard)
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007687 << lType << rType << T
John Wiegley429bb272011-04-08 18:41:53 +00007688 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregor20b3e992009-08-24 17:42:35 +00007689 }
Mike Stump1eb44332009-09-09 15:08:12 +00007690
John Wiegley429bb272011-04-08 18:41:53 +00007691 lex = ImpCastExprToType(lex.take(), T, CK_BitCast);
7692 rex = ImpCastExprToType(rex.take(), T, CK_BitCast);
Douglas Gregor20b3e992009-08-24 17:42:35 +00007693 return ResultTy;
7694 }
Douglas Gregor90566c02011-03-01 17:16:20 +00007695
7696 // Handle scoped enumeration types specifically, since they don't promote
7697 // to integers.
John Wiegley429bb272011-04-08 18:41:53 +00007698 if (lex.get()->getType()->isEnumeralType() &&
7699 Context.hasSameUnqualifiedType(lex.get()->getType(), rex.get()->getType()))
Douglas Gregor90566c02011-03-01 17:16:20 +00007700 return ResultTy;
Sebastian Redl6e8ed162009-05-10 18:38:11 +00007701 }
Mike Stump1eb44332009-09-09 15:08:12 +00007702
Steve Naroff1c7d0672008-09-04 15:10:53 +00007703 // Handle block pointer types.
Mike Stumpdd3e1662009-05-07 03:14:14 +00007704 if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) {
Ted Kremenek6217b802009-07-29 21:53:49 +00007705 QualType lpointee = lType->getAs<BlockPointerType>()->getPointeeType();
7706 QualType rpointee = rType->getAs<BlockPointerType>()->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007707
Steve Naroff1c7d0672008-09-04 15:10:53 +00007708 if (!LHSIsNull && !RHSIsNull &&
Eli Friedman26784c12009-06-08 05:08:54 +00007709 !Context.typesAreCompatible(lpointee, rpointee)) {
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00007710 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
John Wiegley429bb272011-04-08 18:41:53 +00007711 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Steve Naroff1c7d0672008-09-04 15:10:53 +00007712 }
John Wiegley429bb272011-04-08 18:41:53 +00007713 rex = ImpCastExprToType(rex.take(), lType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00007714 return ResultTy;
Steve Naroff1c7d0672008-09-04 15:10:53 +00007715 }
John Wiegley429bb272011-04-08 18:41:53 +00007716
Steve Naroff59f53942008-09-28 01:11:11 +00007717 // Allow block pointers to be compared with null pointer constants.
Mike Stumpdd3e1662009-05-07 03:14:14 +00007718 if (!isRelational
7719 && ((lType->isBlockPointerType() && rType->isPointerType())
7720 || (lType->isPointerType() && rType->isBlockPointerType()))) {
Steve Naroff59f53942008-09-28 01:11:11 +00007721 if (!LHSIsNull && !RHSIsNull) {
John McCall34d6f932011-03-11 04:25:25 +00007722 if (!((rType->isPointerType() && rType->castAs<PointerType>()
Mike Stumpdd3e1662009-05-07 03:14:14 +00007723 ->getPointeeType()->isVoidType())
John McCall34d6f932011-03-11 04:25:25 +00007724 || (lType->isPointerType() && lType->castAs<PointerType>()
Mike Stumpdd3e1662009-05-07 03:14:14 +00007725 ->getPointeeType()->isVoidType())))
7726 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
John Wiegley429bb272011-04-08 18:41:53 +00007727 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Steve Naroff59f53942008-09-28 01:11:11 +00007728 }
John McCall34d6f932011-03-11 04:25:25 +00007729 if (LHSIsNull && !RHSIsNull)
John Wiegley429bb272011-04-08 18:41:53 +00007730 lex = ImpCastExprToType(lex.take(), rType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00007731 else
John Wiegley429bb272011-04-08 18:41:53 +00007732 rex = ImpCastExprToType(rex.take(), lType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00007733 return ResultTy;
Steve Naroff59f53942008-09-28 01:11:11 +00007734 }
Steve Naroff1c7d0672008-09-04 15:10:53 +00007735
John McCall34d6f932011-03-11 04:25:25 +00007736 if (lType->isObjCObjectPointerType() || rType->isObjCObjectPointerType()) {
7737 const PointerType *LPT = lType->getAs<PointerType>();
7738 const PointerType *RPT = rType->getAs<PointerType>();
7739 if (LPT || RPT) {
7740 bool LPtrToVoid = LPT ? LPT->getPointeeType()->isVoidType() : false;
7741 bool RPtrToVoid = RPT ? RPT->getPointeeType()->isVoidType() : false;
Mike Stumpeed9cac2009-02-19 03:04:26 +00007742
Steve Naroffa8069f12008-11-17 19:49:16 +00007743 if (!LPtrToVoid && !RPtrToVoid &&
7744 !Context.typesAreCompatible(lType, rType)) {
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00007745 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers)
John Wiegley429bb272011-04-08 18:41:53 +00007746 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Steve Naroffa5ad8632008-10-27 10:33:19 +00007747 }
John McCall34d6f932011-03-11 04:25:25 +00007748 if (LHSIsNull && !RHSIsNull)
John Wiegley429bb272011-04-08 18:41:53 +00007749 lex = ImpCastExprToType(lex.take(), rType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00007750 else
John Wiegley429bb272011-04-08 18:41:53 +00007751 rex = ImpCastExprToType(rex.take(), lType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00007752 return ResultTy;
Steve Naroff87f3b932008-10-20 18:19:10 +00007753 }
Steve Naroff14108da2009-07-10 23:34:53 +00007754 if (lType->isObjCObjectPointerType() && rType->isObjCObjectPointerType()) {
Chris Lattner6365e3e2009-08-22 18:58:31 +00007755 if (!Context.areComparableObjCPointerTypes(lType, rType))
Steve Naroff14108da2009-07-10 23:34:53 +00007756 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers)
John Wiegley429bb272011-04-08 18:41:53 +00007757 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
John McCall34d6f932011-03-11 04:25:25 +00007758 if (LHSIsNull && !RHSIsNull)
John Wiegley429bb272011-04-08 18:41:53 +00007759 lex = ImpCastExprToType(lex.take(), rType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00007760 else
John Wiegley429bb272011-04-08 18:41:53 +00007761 rex = ImpCastExprToType(rex.take(), lType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00007762 return ResultTy;
Steve Naroff20373222008-06-03 14:04:54 +00007763 }
Fariborz Jahanian7359f042007-12-20 01:06:58 +00007764 }
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007765 if ((lType->isAnyPointerType() && rType->isIntegerType()) ||
7766 (lType->isIntegerType() && rType->isAnyPointerType())) {
Chris Lattner06c0f5b2009-08-23 00:03:44 +00007767 unsigned DiagID = 0;
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007768 bool isError = false;
7769 if ((LHSIsNull && lType->isIntegerType()) ||
7770 (RHSIsNull && rType->isIntegerType())) {
7771 if (isRelational && !getLangOptions().CPlusPlus)
Chris Lattner06c0f5b2009-08-23 00:03:44 +00007772 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero;
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007773 } else if (isRelational && !getLangOptions().CPlusPlus)
Chris Lattner06c0f5b2009-08-23 00:03:44 +00007774 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer;
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007775 else if (getLangOptions().CPlusPlus) {
7776 DiagID = diag::err_typecheck_comparison_of_pointer_integer;
7777 isError = true;
7778 } else
Chris Lattner06c0f5b2009-08-23 00:03:44 +00007779 DiagID = diag::ext_typecheck_comparison_of_pointer_integer;
Mike Stump1eb44332009-09-09 15:08:12 +00007780
Chris Lattner06c0f5b2009-08-23 00:03:44 +00007781 if (DiagID) {
Chris Lattner6365e3e2009-08-22 18:58:31 +00007782 Diag(Loc, DiagID)
John Wiegley429bb272011-04-08 18:41:53 +00007783 << lType << rType << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007784 if (isError)
7785 return QualType();
Chris Lattner6365e3e2009-08-22 18:58:31 +00007786 }
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007787
7788 if (lType->isIntegerType())
John Wiegley429bb272011-04-08 18:41:53 +00007789 lex = ImpCastExprToType(lex.take(), rType,
John McCall404cd162010-11-13 01:35:44 +00007790 LHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
Chris Lattner06c0f5b2009-08-23 00:03:44 +00007791 else
John Wiegley429bb272011-04-08 18:41:53 +00007792 rex = ImpCastExprToType(rex.take(), lType,
John McCall404cd162010-11-13 01:35:44 +00007793 RHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
Douglas Gregor447b69e2008-11-19 03:25:36 +00007794 return ResultTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00007795 }
Douglas Gregor6e5122c2010-06-15 21:38:40 +00007796
Steve Naroff39218df2008-09-04 16:56:14 +00007797 // Handle block pointers.
Mike Stumpaf199f32009-05-07 18:43:07 +00007798 if (!isRelational && RHSIsNull
7799 && lType->isBlockPointerType() && rType->isIntegerType()) {
John Wiegley429bb272011-04-08 18:41:53 +00007800 rex = ImpCastExprToType(rex.take(), lType, CK_NullToPointer);
Douglas Gregor447b69e2008-11-19 03:25:36 +00007801 return ResultTy;
Steve Naroff39218df2008-09-04 16:56:14 +00007802 }
Mike Stumpaf199f32009-05-07 18:43:07 +00007803 if (!isRelational && LHSIsNull
7804 && lType->isIntegerType() && rType->isBlockPointerType()) {
John Wiegley429bb272011-04-08 18:41:53 +00007805 lex = ImpCastExprToType(lex.take(), rType, CK_NullToPointer);
Douglas Gregor447b69e2008-11-19 03:25:36 +00007806 return ResultTy;
Steve Naroff39218df2008-09-04 16:56:14 +00007807 }
Douglas Gregor90566c02011-03-01 17:16:20 +00007808
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007809 return InvalidOperands(Loc, lex, rex);
Reid Spencer5f016e22007-07-11 17:01:13 +00007810}
7811
Nate Begemanbe2341d2008-07-14 18:02:46 +00007812/// CheckVectorCompareOperands - vector comparisons are a clang extension that
Mike Stumpeed9cac2009-02-19 03:04:26 +00007813/// operates on extended vector types. Instead of producing an IntTy result,
Nate Begemanbe2341d2008-07-14 18:02:46 +00007814/// like a scalar comparison, a vector comparison produces a vector of integer
7815/// types.
John Wiegley429bb272011-04-08 18:41:53 +00007816QualType Sema::CheckVectorCompareOperands(ExprResult &lex, ExprResult &rex,
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007817 SourceLocation Loc,
Nate Begemanbe2341d2008-07-14 18:02:46 +00007818 bool isRelational) {
7819 // Check to make sure we're operating on vectors of the same type and width,
7820 // Allowing one side to be a scalar of element type.
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007821 QualType vType = CheckVectorOperands(Loc, lex, rex);
Nate Begemanbe2341d2008-07-14 18:02:46 +00007822 if (vType.isNull())
7823 return vType;
Mike Stumpeed9cac2009-02-19 03:04:26 +00007824
John Wiegley429bb272011-04-08 18:41:53 +00007825 QualType lType = lex.get()->getType();
7826 QualType rType = rex.get()->getType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007827
Anton Yartsev7870b132011-03-27 15:36:07 +00007828 // If AltiVec, the comparison results in a numeric type, i.e.
7829 // bool for C++, int for C
Anton Yartsev6305f722011-03-28 21:00:05 +00007830 if (vType->getAs<VectorType>()->getVectorKind() == VectorType::AltiVecVector)
Anton Yartsev7870b132011-03-27 15:36:07 +00007831 return Context.getLogicalOperationType();
7832
Nate Begemanbe2341d2008-07-14 18:02:46 +00007833 // For non-floating point types, check for self-comparisons of the form
7834 // x == x, x != x, x < x, etc. These always evaluate to a constant, and
7835 // often indicate logic errors in the program.
Douglas Gregor8eee1192010-06-22 22:12:46 +00007836 if (!lType->hasFloatingRepresentation()) {
John Wiegley429bb272011-04-08 18:41:53 +00007837 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex.get()->IgnoreParens()))
7838 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex.get()->IgnoreParens()))
Nate Begemanbe2341d2008-07-14 18:02:46 +00007839 if (DRL->getDecl() == DRR->getDecl())
Ted Kremenek351ba912011-02-23 01:52:04 +00007840 DiagRuntimeBehavior(Loc, 0,
Douglas Gregord64fdd02010-06-08 19:50:34 +00007841 PDiag(diag::warn_comparison_always)
7842 << 0 // self-
7843 << 2 // "a constant"
7844 );
Nate Begemanbe2341d2008-07-14 18:02:46 +00007845 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007846
Nate Begemanbe2341d2008-07-14 18:02:46 +00007847 // Check for comparisons of floating point operands using != and ==.
Douglas Gregor8eee1192010-06-22 22:12:46 +00007848 if (!isRelational && lType->hasFloatingRepresentation()) {
7849 assert (rType->hasFloatingRepresentation());
John Wiegley429bb272011-04-08 18:41:53 +00007850 CheckFloatComparison(Loc, lex.get(), rex.get());
Nate Begemanbe2341d2008-07-14 18:02:46 +00007851 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007852
Nate Begemanbe2341d2008-07-14 18:02:46 +00007853 // Return the type for the comparison, which is the same as vector type for
7854 // integer vectors, or an integer type of identical size and number of
7855 // elements for floating point vectors.
Douglas Gregorf6094622010-07-23 15:58:24 +00007856 if (lType->hasIntegerRepresentation())
Nate Begemanbe2341d2008-07-14 18:02:46 +00007857 return lType;
Mike Stumpeed9cac2009-02-19 03:04:26 +00007858
John McCall183700f2009-09-21 23:43:11 +00007859 const VectorType *VTy = lType->getAs<VectorType>();
Nate Begemanbe2341d2008-07-14 18:02:46 +00007860 unsigned TypeSize = Context.getTypeSize(VTy->getElementType());
Nate Begeman59b5da62009-01-18 03:20:47 +00007861 if (TypeSize == Context.getTypeSize(Context.IntTy))
Nate Begemanbe2341d2008-07-14 18:02:46 +00007862 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements());
Chris Lattnerd013aa12009-03-31 07:46:52 +00007863 if (TypeSize == Context.getTypeSize(Context.LongTy))
Nate Begeman59b5da62009-01-18 03:20:47 +00007864 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements());
7865
Mike Stumpeed9cac2009-02-19 03:04:26 +00007866 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) &&
Nate Begeman59b5da62009-01-18 03:20:47 +00007867 "Unhandled vector element size in vector compare");
Nate Begemanbe2341d2008-07-14 18:02:46 +00007868 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements());
7869}
7870
Reid Spencer5f016e22007-07-11 17:01:13 +00007871inline QualType Sema::CheckBitwiseOperands(
John Wiegley429bb272011-04-08 18:41:53 +00007872 ExprResult &lex, ExprResult &rex, SourceLocation Loc, bool isCompAssign) {
7873 if (lex.get()->getType()->isVectorType() || rex.get()->getType()->isVectorType()) {
7874 if (lex.get()->getType()->hasIntegerRepresentation() &&
7875 rex.get()->getType()->hasIntegerRepresentation())
Douglas Gregorf6094622010-07-23 15:58:24 +00007876 return CheckVectorOperands(Loc, lex, rex);
7877
7878 return InvalidOperands(Loc, lex, rex);
7879 }
Steve Naroff90045e82007-07-13 23:32:42 +00007880
John Wiegley429bb272011-04-08 18:41:53 +00007881 ExprResult lexResult = Owned(lex), rexResult = Owned(rex);
7882 QualType compType = UsualArithmeticConversions(lexResult, rexResult, isCompAssign);
7883 if (lexResult.isInvalid() || rexResult.isInvalid())
7884 return QualType();
7885 lex = lexResult.take();
7886 rex = rexResult.take();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007887
John Wiegley429bb272011-04-08 18:41:53 +00007888 if (lex.get()->getType()->isIntegralOrUnscopedEnumerationType() &&
7889 rex.get()->getType()->isIntegralOrUnscopedEnumerationType())
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00007890 return compType;
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007891 return InvalidOperands(Loc, lex, rex);
Reid Spencer5f016e22007-07-11 17:01:13 +00007892}
7893
7894inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14]
John Wiegley429bb272011-04-08 18:41:53 +00007895 ExprResult &lex, ExprResult &rex, SourceLocation Loc, unsigned Opc) {
Chris Lattner90a8f272010-07-13 19:41:32 +00007896
7897 // Diagnose cases where the user write a logical and/or but probably meant a
7898 // bitwise one. We do this when the LHS is a non-bool integer and the RHS
7899 // is a constant.
John Wiegley429bb272011-04-08 18:41:53 +00007900 if (lex.get()->getType()->isIntegerType() && !lex.get()->getType()->isBooleanType() &&
7901 rex.get()->getType()->isIntegerType() && !rex.get()->isValueDependent() &&
Chris Lattner23ef3e42010-07-15 00:26:43 +00007902 // Don't warn in macros.
Chris Lattnerb7690b42010-07-24 01:10:11 +00007903 !Loc.isMacroID()) {
7904 // If the RHS can be constant folded, and if it constant folds to something
7905 // that isn't 0 or 1 (which indicate a potential logical operation that
7906 // happened to fold to true/false) then warn.
Chandler Carruth0683a142011-05-31 05:41:42 +00007907 // Parens on the RHS are ignored.
Chris Lattnerb7690b42010-07-24 01:10:11 +00007908 Expr::EvalResult Result;
Chandler Carruth0683a142011-05-31 05:41:42 +00007909 if (rex.get()->Evaluate(Result, Context) && !Result.HasSideEffects)
7910 if ((getLangOptions().Bool && !rex.get()->getType()->isBooleanType()) ||
7911 (Result.Val.getInt() != 0 && Result.Val.getInt() != 1)) {
7912 Diag(Loc, diag::warn_logical_instead_of_bitwise)
7913 << rex.get()->getSourceRange()
7914 << (Opc == BO_LAnd ? "&&" : "||")
7915 << (Opc == BO_LAnd ? "&" : "|");
Chris Lattnerb7690b42010-07-24 01:10:11 +00007916 }
7917 }
Chris Lattner90a8f272010-07-13 19:41:32 +00007918
Anders Carlssona4c98cd2009-11-23 21:47:44 +00007919 if (!Context.getLangOptions().CPlusPlus) {
John Wiegley429bb272011-04-08 18:41:53 +00007920 lex = UsualUnaryConversions(lex.take());
7921 if (lex.isInvalid())
7922 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007923
John Wiegley429bb272011-04-08 18:41:53 +00007924 rex = UsualUnaryConversions(rex.take());
7925 if (rex.isInvalid())
7926 return QualType();
7927
7928 if (!lex.get()->getType()->isScalarType() || !rex.get()->getType()->isScalarType())
Anders Carlssona4c98cd2009-11-23 21:47:44 +00007929 return InvalidOperands(Loc, lex, rex);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007930
Anders Carlssona4c98cd2009-11-23 21:47:44 +00007931 return Context.IntTy;
Anders Carlsson04905012009-10-16 01:44:21 +00007932 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007933
John McCall75f7c0f2010-06-04 00:29:51 +00007934 // The following is safe because we only use this method for
7935 // non-overloadable operands.
7936
Anders Carlssona4c98cd2009-11-23 21:47:44 +00007937 // C++ [expr.log.and]p1
7938 // C++ [expr.log.or]p1
John McCall75f7c0f2010-06-04 00:29:51 +00007939 // The operands are both contextually converted to type bool.
John Wiegley429bb272011-04-08 18:41:53 +00007940 ExprResult lexRes = PerformContextuallyConvertToBool(lex.get());
7941 if (lexRes.isInvalid())
Anders Carlssona4c98cd2009-11-23 21:47:44 +00007942 return InvalidOperands(Loc, lex, rex);
John Wiegley429bb272011-04-08 18:41:53 +00007943 lex = move(lexRes);
7944
7945 ExprResult rexRes = PerformContextuallyConvertToBool(rex.get());
7946 if (rexRes.isInvalid())
7947 return InvalidOperands(Loc, lex, rex);
7948 rex = move(rexRes);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007949
Anders Carlssona4c98cd2009-11-23 21:47:44 +00007950 // C++ [expr.log.and]p2
7951 // C++ [expr.log.or]p2
7952 // The result is a bool.
7953 return Context.BoolTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00007954}
7955
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00007956/// IsReadonlyProperty - Verify that otherwise a valid l-value expression
7957/// is a read-only property; return true if so. A readonly property expression
7958/// depends on various declarations and thus must be treated specially.
7959///
Mike Stump1eb44332009-09-09 15:08:12 +00007960static bool IsReadonlyProperty(Expr *E, Sema &S) {
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00007961 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) {
7962 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E);
John McCall12f78a62010-12-02 01:19:52 +00007963 if (PropExpr->isImplicitProperty()) return false;
7964
7965 ObjCPropertyDecl *PDecl = PropExpr->getExplicitProperty();
7966 QualType BaseType = PropExpr->isSuperReceiver() ?
7967 PropExpr->getSuperReceiverType() :
Fariborz Jahanian8ac2d442010-10-14 16:04:05 +00007968 PropExpr->getBase()->getType();
7969
John McCall12f78a62010-12-02 01:19:52 +00007970 if (const ObjCObjectPointerType *OPT =
7971 BaseType->getAsObjCInterfacePointerType())
7972 if (ObjCInterfaceDecl *IFace = OPT->getInterfaceDecl())
7973 if (S.isPropertyReadonly(PDecl, IFace))
7974 return true;
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00007975 }
7976 return false;
7977}
7978
Fariborz Jahanian14086762011-03-28 23:47:18 +00007979static bool IsConstProperty(Expr *E, Sema &S) {
7980 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) {
7981 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E);
7982 if (PropExpr->isImplicitProperty()) return false;
7983
7984 ObjCPropertyDecl *PDecl = PropExpr->getExplicitProperty();
7985 QualType T = PDecl->getType();
7986 if (T->isReferenceType())
Fariborz Jahanian61750f22011-03-30 16:59:30 +00007987 T = T->getAs<ReferenceType>()->getPointeeType();
Fariborz Jahanian14086762011-03-28 23:47:18 +00007988 CanQualType CT = S.Context.getCanonicalType(T);
7989 return CT.isConstQualified();
7990 }
7991 return false;
7992}
7993
Fariborz Jahanian077f4902011-03-26 19:48:30 +00007994static bool IsReadonlyMessage(Expr *E, Sema &S) {
7995 if (E->getStmtClass() != Expr::MemberExprClass)
7996 return false;
7997 const MemberExpr *ME = cast<MemberExpr>(E);
7998 NamedDecl *Member = ME->getMemberDecl();
7999 if (isa<FieldDecl>(Member)) {
8000 Expr *Base = ME->getBase()->IgnoreParenImpCasts();
8001 if (Base->getStmtClass() != Expr::ObjCMessageExprClass)
8002 return false;
8003 return cast<ObjCMessageExpr>(Base)->getMethodDecl() != 0;
8004 }
8005 return false;
8006}
8007
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008008/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not,
8009/// emit an error and return true. If so, return false.
8010static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) {
Daniel Dunbar44e35f72009-04-15 00:08:05 +00008011 SourceLocation OrigLoc = Loc;
Mike Stump1eb44332009-09-09 15:08:12 +00008012 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context,
Daniel Dunbar44e35f72009-04-15 00:08:05 +00008013 &Loc);
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00008014 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S))
8015 IsLV = Expr::MLV_ReadonlyProperty;
Fariborz Jahanian14086762011-03-28 23:47:18 +00008016 else if (Expr::MLV_ConstQualified && IsConstProperty(E, S))
8017 IsLV = Expr::MLV_Valid;
Fariborz Jahanian077f4902011-03-26 19:48:30 +00008018 else if (IsLV == Expr::MLV_ClassTemporary && IsReadonlyMessage(E, S))
8019 IsLV = Expr::MLV_InvalidMessageExpression;
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008020 if (IsLV == Expr::MLV_Valid)
8021 return false;
Mike Stumpeed9cac2009-02-19 03:04:26 +00008022
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008023 unsigned Diag = 0;
8024 bool NeedType = false;
8025 switch (IsLV) { // C99 6.5.16p2
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008026 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break;
Mike Stumpeed9cac2009-02-19 03:04:26 +00008027 case Expr::MLV_ArrayType:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008028 Diag = diag::err_typecheck_array_not_modifiable_lvalue;
8029 NeedType = true;
8030 break;
Mike Stumpeed9cac2009-02-19 03:04:26 +00008031 case Expr::MLV_NotObjectType:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008032 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue;
8033 NeedType = true;
8034 break;
Chris Lattnerca354fa2008-11-17 19:51:54 +00008035 case Expr::MLV_LValueCast:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008036 Diag = diag::err_typecheck_lvalue_casts_not_supported;
8037 break;
Douglas Gregore873fb72010-02-16 21:39:57 +00008038 case Expr::MLV_Valid:
8039 llvm_unreachable("did not take early return for MLV_Valid");
Chris Lattner5cf216b2008-01-04 18:04:52 +00008040 case Expr::MLV_InvalidExpression:
Douglas Gregore873fb72010-02-16 21:39:57 +00008041 case Expr::MLV_MemberFunction:
8042 case Expr::MLV_ClassTemporary:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008043 Diag = diag::err_typecheck_expression_not_modifiable_lvalue;
8044 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00008045 case Expr::MLV_IncompleteType:
8046 case Expr::MLV_IncompleteVoidType:
Douglas Gregor86447ec2009-03-09 16:13:40 +00008047 return S.RequireCompleteType(Loc, E->getType(),
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00008048 S.PDiag(diag::err_typecheck_incomplete_type_not_modifiable_lvalue)
Anders Carlssonb7906612009-08-26 23:45:07 +00008049 << E->getSourceRange());
Chris Lattner5cf216b2008-01-04 18:04:52 +00008050 case Expr::MLV_DuplicateVectorComponents:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008051 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue;
8052 break;
Steve Naroff4f6a7d72008-09-26 14:41:28 +00008053 case Expr::MLV_NotBlockQualified:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008054 Diag = diag::err_block_decl_ref_not_modifiable_lvalue;
8055 break;
Fariborz Jahanian5daf5702008-11-22 18:39:36 +00008056 case Expr::MLV_ReadonlyProperty:
8057 Diag = diag::error_readonly_property_assignment;
8058 break;
Fariborz Jahanianba8d2d62008-11-22 20:25:50 +00008059 case Expr::MLV_NoSetterProperty:
8060 Diag = diag::error_nosetter_property_assignment;
8061 break;
Fariborz Jahanian077f4902011-03-26 19:48:30 +00008062 case Expr::MLV_InvalidMessageExpression:
8063 Diag = diag::error_readonly_message_assignment;
8064 break;
Fariborz Jahanian2514a302009-12-15 23:59:41 +00008065 case Expr::MLV_SubObjCPropertySetting:
8066 Diag = diag::error_no_subobject_property_setting;
8067 break;
Reid Spencer5f016e22007-07-11 17:01:13 +00008068 }
Steve Naroffd1861fd2007-07-31 12:34:36 +00008069
Daniel Dunbar44e35f72009-04-15 00:08:05 +00008070 SourceRange Assign;
8071 if (Loc != OrigLoc)
8072 Assign = SourceRange(OrigLoc, OrigLoc);
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008073 if (NeedType)
Daniel Dunbar44e35f72009-04-15 00:08:05 +00008074 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign;
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008075 else
Mike Stump1eb44332009-09-09 15:08:12 +00008076 S.Diag(Loc, Diag) << E->getSourceRange() << Assign;
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008077 return true;
8078}
8079
8080
8081
8082// C99 6.5.16.1
John Wiegley429bb272011-04-08 18:41:53 +00008083QualType Sema::CheckAssignmentOperands(Expr *LHS, ExprResult &RHS,
Chris Lattner29a1cfb2008-11-18 01:30:42 +00008084 SourceLocation Loc,
8085 QualType CompoundType) {
8086 // Verify that LHS is a modifiable lvalue, and emit error if not.
8087 if (CheckForModifiableLvalue(LHS, Loc, *this))
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00008088 return QualType();
Chris Lattner29a1cfb2008-11-18 01:30:42 +00008089
8090 QualType LHSType = LHS->getType();
John Wiegley429bb272011-04-08 18:41:53 +00008091 QualType RHSType = CompoundType.isNull() ? RHS.get()->getType() : CompoundType;
Chris Lattner5cf216b2008-01-04 18:04:52 +00008092 AssignConvertType ConvTy;
Chris Lattner29a1cfb2008-11-18 01:30:42 +00008093 if (CompoundType.isNull()) {
Fariborz Jahaniane2a901a2010-06-07 22:02:01 +00008094 QualType LHSTy(LHSType);
Chris Lattner2c156472008-08-21 18:04:13 +00008095 // Simple assignment "x = y".
John Wiegley429bb272011-04-08 18:41:53 +00008096 if (LHS->getObjectKind() == OK_ObjCProperty) {
8097 ExprResult LHSResult = Owned(LHS);
8098 ConvertPropertyForLValue(LHSResult, RHS, LHSTy);
8099 if (LHSResult.isInvalid())
8100 return QualType();
8101 LHS = LHSResult.take();
8102 }
Fariborz Jahaniane2a901a2010-06-07 22:02:01 +00008103 ConvTy = CheckSingleAssignmentConstraints(LHSTy, RHS);
John Wiegley429bb272011-04-08 18:41:53 +00008104 if (RHS.isInvalid())
8105 return QualType();
Fariborz Jahanianfa23c1d2009-01-13 23:34:40 +00008106 // Special case of NSObject attributes on c-style pointer types.
8107 if (ConvTy == IncompatiblePointer &&
8108 ((Context.isObjCNSObjectType(LHSType) &&
Steve Narofff4954562009-07-16 15:41:00 +00008109 RHSType->isObjCObjectPointerType()) ||
Fariborz Jahanianfa23c1d2009-01-13 23:34:40 +00008110 (Context.isObjCNSObjectType(RHSType) &&
Steve Narofff4954562009-07-16 15:41:00 +00008111 LHSType->isObjCObjectPointerType())))
Fariborz Jahanianfa23c1d2009-01-13 23:34:40 +00008112 ConvTy = Compatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00008113
John McCallf89e55a2010-11-18 06:31:45 +00008114 if (ConvTy == Compatible &&
8115 getLangOptions().ObjCNonFragileABI &&
8116 LHSType->isObjCObjectType())
8117 Diag(Loc, diag::err_assignment_requires_nonfragile_object)
8118 << LHSType;
8119
Chris Lattner2c156472008-08-21 18:04:13 +00008120 // If the RHS is a unary plus or minus, check to see if they = and + are
8121 // right next to each other. If so, the user may have typo'd "x =+ 4"
8122 // instead of "x += 4".
John Wiegley429bb272011-04-08 18:41:53 +00008123 Expr *RHSCheck = RHS.get();
Chris Lattner2c156472008-08-21 18:04:13 +00008124 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck))
8125 RHSCheck = ICE->getSubExpr();
8126 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) {
John McCall2de56d12010-08-25 11:45:40 +00008127 if ((UO->getOpcode() == UO_Plus ||
8128 UO->getOpcode() == UO_Minus) &&
Chris Lattner29a1cfb2008-11-18 01:30:42 +00008129 Loc.isFileID() && UO->getOperatorLoc().isFileID() &&
Chris Lattner2c156472008-08-21 18:04:13 +00008130 // Only if the two operators are exactly adjacent.
Chris Lattner399bd1b2009-03-08 06:51:10 +00008131 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() &&
8132 // And there is a space or other character before the subexpr of the
8133 // unary +/-. We don't want to warn on "x=-1".
Chris Lattner3e872092009-03-09 07:11:10 +00008134 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() &&
8135 UO->getSubExpr()->getLocStart().isFileID()) {
Chris Lattnerd3a94e22008-11-20 06:06:08 +00008136 Diag(Loc, diag::warn_not_compound_assign)
John McCall2de56d12010-08-25 11:45:40 +00008137 << (UO->getOpcode() == UO_Plus ? "+" : "-")
Chris Lattnerd3a94e22008-11-20 06:06:08 +00008138 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc());
Chris Lattner399bd1b2009-03-08 06:51:10 +00008139 }
Chris Lattner2c156472008-08-21 18:04:13 +00008140 }
8141 } else {
8142 // Compound assignment "x += y"
Douglas Gregorb608b982011-01-28 02:26:04 +00008143 ConvTy = CheckAssignmentConstraints(Loc, LHSType, RHSType);
Chris Lattner2c156472008-08-21 18:04:13 +00008144 }
Chris Lattner5cf216b2008-01-04 18:04:52 +00008145
Chris Lattner29a1cfb2008-11-18 01:30:42 +00008146 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType,
John Wiegley429bb272011-04-08 18:41:53 +00008147 RHS.get(), AA_Assigning))
Chris Lattner5cf216b2008-01-04 18:04:52 +00008148 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00008149
Argyrios Kyrtzidis8a285ae2011-04-26 17:41:22 +00008150 CheckForNullPointerDereference(*this, LHS);
Ted Kremeneka0125d82011-02-16 01:57:07 +00008151 // Check for trivial buffer overflows.
Ted Kremenek3aea4da2011-03-01 18:41:00 +00008152 CheckArrayAccess(LHS->IgnoreParenCasts());
Ted Kremeneka0125d82011-02-16 01:57:07 +00008153
Reid Spencer5f016e22007-07-11 17:01:13 +00008154 // C99 6.5.16p3: The type of an assignment expression is the type of the
8155 // left operand unless the left operand has qualified type, in which case
Mike Stumpeed9cac2009-02-19 03:04:26 +00008156 // it is the unqualified version of the type of the left operand.
Reid Spencer5f016e22007-07-11 17:01:13 +00008157 // C99 6.5.16.1p2: In simple assignment, the value of the right operand
8158 // is converted to the type of the assignment expression (above).
Chris Lattner73d0d4f2007-08-30 17:45:32 +00008159 // C++ 5.17p1: the type of the assignment expression is that of its left
Douglas Gregor2d833e32009-05-02 00:36:19 +00008160 // operand.
John McCall2bf6f492010-10-12 02:19:57 +00008161 return (getLangOptions().CPlusPlus
8162 ? LHSType : LHSType.getUnqualifiedType());
Reid Spencer5f016e22007-07-11 17:01:13 +00008163}
8164
Chris Lattner29a1cfb2008-11-18 01:30:42 +00008165// C99 6.5.17
John Wiegley429bb272011-04-08 18:41:53 +00008166static QualType CheckCommaOperands(Sema &S, ExprResult &LHS, ExprResult &RHS,
John McCall09431682010-11-18 19:01:18 +00008167 SourceLocation Loc) {
John Wiegley429bb272011-04-08 18:41:53 +00008168 S.DiagnoseUnusedExprResult(LHS.get());
Argyrios Kyrtzidis25973452010-06-30 10:53:14 +00008169
John McCallfb8721c2011-04-10 19:13:55 +00008170 LHS = S.CheckPlaceholderExpr(LHS.take());
8171 RHS = S.CheckPlaceholderExpr(RHS.take());
John Wiegley429bb272011-04-08 18:41:53 +00008172 if (LHS.isInvalid() || RHS.isInvalid())
Douglas Gregor7ad5d422010-11-09 21:07:58 +00008173 return QualType();
8174
John McCallcf2e5062010-10-12 07:14:40 +00008175 // C's comma performs lvalue conversion (C99 6.3.2.1) on both its
8176 // operands, but not unary promotions.
8177 // C++'s comma does not do any conversions at all (C++ [expr.comma]p1).
Eli Friedmanb1d796d2009-03-23 00:24:07 +00008178
John McCallf6a16482010-12-04 03:47:34 +00008179 // So we treat the LHS as a ignored value, and in C++ we allow the
8180 // containing site to determine what should be done with the RHS.
John Wiegley429bb272011-04-08 18:41:53 +00008181 LHS = S.IgnoredValueConversions(LHS.take());
8182 if (LHS.isInvalid())
8183 return QualType();
John McCallf6a16482010-12-04 03:47:34 +00008184
8185 if (!S.getLangOptions().CPlusPlus) {
John Wiegley429bb272011-04-08 18:41:53 +00008186 RHS = S.DefaultFunctionArrayLvalueConversion(RHS.take());
8187 if (RHS.isInvalid())
8188 return QualType();
8189 if (!RHS.get()->getType()->isVoidType())
8190 S.RequireCompleteType(Loc, RHS.get()->getType(), diag::err_incomplete_type);
John McCallcf2e5062010-10-12 07:14:40 +00008191 }
Eli Friedmanb1d796d2009-03-23 00:24:07 +00008192
John Wiegley429bb272011-04-08 18:41:53 +00008193 return RHS.get()->getType();
Reid Spencer5f016e22007-07-11 17:01:13 +00008194}
8195
Steve Naroff49b45262007-07-13 16:58:59 +00008196/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine
8197/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions.
John McCall09431682010-11-18 19:01:18 +00008198static QualType CheckIncrementDecrementOperand(Sema &S, Expr *Op,
8199 ExprValueKind &VK,
8200 SourceLocation OpLoc,
8201 bool isInc, bool isPrefix) {
Sebastian Redl28507842009-02-26 14:39:58 +00008202 if (Op->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00008203 return S.Context.DependentTy;
Sebastian Redl28507842009-02-26 14:39:58 +00008204
Chris Lattner3528d352008-11-21 07:05:48 +00008205 QualType ResType = Op->getType();
8206 assert(!ResType.isNull() && "no type for increment/decrement expression");
Reid Spencer5f016e22007-07-11 17:01:13 +00008207
John McCall09431682010-11-18 19:01:18 +00008208 if (S.getLangOptions().CPlusPlus && ResType->isBooleanType()) {
Sebastian Redle6d5a4a2008-12-20 09:35:34 +00008209 // Decrement of bool is not allowed.
8210 if (!isInc) {
John McCall09431682010-11-18 19:01:18 +00008211 S.Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange();
Sebastian Redle6d5a4a2008-12-20 09:35:34 +00008212 return QualType();
8213 }
8214 // Increment of bool sets it to true, but is deprecated.
John McCall09431682010-11-18 19:01:18 +00008215 S.Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange();
Sebastian Redle6d5a4a2008-12-20 09:35:34 +00008216 } else if (ResType->isRealType()) {
Chris Lattner3528d352008-11-21 07:05:48 +00008217 // OK!
Steve Naroff58f9f2c2009-07-14 18:25:06 +00008218 } else if (ResType->isAnyPointerType()) {
8219 QualType PointeeTy = ResType->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00008220
Chris Lattner3528d352008-11-21 07:05:48 +00008221 // C99 6.5.2.4p2, 6.5.6p2
Steve Naroff14108da2009-07-10 23:34:53 +00008222 if (PointeeTy->isVoidType()) {
John McCall09431682010-11-18 19:01:18 +00008223 if (S.getLangOptions().CPlusPlus) {
8224 S.Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type)
Douglas Gregorc983b862009-01-23 00:36:41 +00008225 << Op->getSourceRange();
8226 return QualType();
8227 }
8228
8229 // Pointer to void is a GNU extension in C.
John McCall09431682010-11-18 19:01:18 +00008230 S.Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange();
Steve Naroff14108da2009-07-10 23:34:53 +00008231 } else if (PointeeTy->isFunctionType()) {
John McCall09431682010-11-18 19:01:18 +00008232 if (S.getLangOptions().CPlusPlus) {
8233 S.Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type)
Douglas Gregorc983b862009-01-23 00:36:41 +00008234 << Op->getType() << Op->getSourceRange();
8235 return QualType();
8236 }
8237
John McCall09431682010-11-18 19:01:18 +00008238 S.Diag(OpLoc, diag::ext_gnu_ptr_func_arith)
Chris Lattnerd1625842008-11-24 06:25:27 +00008239 << ResType << Op->getSourceRange();
John McCall09431682010-11-18 19:01:18 +00008240 } else if (S.RequireCompleteType(OpLoc, PointeeTy,
8241 S.PDiag(diag::err_typecheck_arithmetic_incomplete_type)
Mike Stump1eb44332009-09-09 15:08:12 +00008242 << Op->getSourceRange()
Anders Carlssond497ba72009-08-26 22:59:12 +00008243 << ResType))
Douglas Gregor4ec339f2009-01-19 19:26:10 +00008244 return QualType();
Fariborz Jahanian9f8a04f2009-07-16 17:59:14 +00008245 // Diagnose bad cases where we step over interface counts.
John McCall09431682010-11-18 19:01:18 +00008246 else if (PointeeTy->isObjCObjectType() && S.LangOpts.ObjCNonFragileABI) {
8247 S.Diag(OpLoc, diag::err_arithmetic_nonfragile_interface)
Fariborz Jahanian9f8a04f2009-07-16 17:59:14 +00008248 << PointeeTy << Op->getSourceRange();
8249 return QualType();
8250 }
Eli Friedman5b088a12010-01-03 00:20:48 +00008251 } else if (ResType->isAnyComplexType()) {
Chris Lattner3528d352008-11-21 07:05:48 +00008252 // C99 does not support ++/-- on complex types, we allow as an extension.
John McCall09431682010-11-18 19:01:18 +00008253 S.Diag(OpLoc, diag::ext_integer_increment_complex)
Chris Lattnerd1625842008-11-24 06:25:27 +00008254 << ResType << Op->getSourceRange();
John McCall2cd11fe2010-10-12 02:09:17 +00008255 } else if (ResType->isPlaceholderType()) {
John McCallfb8721c2011-04-10 19:13:55 +00008256 ExprResult PR = S.CheckPlaceholderExpr(Op);
John McCall2cd11fe2010-10-12 02:09:17 +00008257 if (PR.isInvalid()) return QualType();
John McCall09431682010-11-18 19:01:18 +00008258 return CheckIncrementDecrementOperand(S, PR.take(), VK, OpLoc,
8259 isInc, isPrefix);
Anton Yartsev683564a2011-02-07 02:17:30 +00008260 } else if (S.getLangOptions().AltiVec && ResType->isVectorType()) {
8261 // OK! ( C/C++ Language Extensions for CBEA(Version 2.6) 10.3 )
Chris Lattner3528d352008-11-21 07:05:48 +00008262 } else {
John McCall09431682010-11-18 19:01:18 +00008263 S.Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement)
Douglas Gregor5cc07df2009-12-15 16:44:32 +00008264 << ResType << int(isInc) << Op->getSourceRange();
Chris Lattner3528d352008-11-21 07:05:48 +00008265 return QualType();
Reid Spencer5f016e22007-07-11 17:01:13 +00008266 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008267 // At this point, we know we have a real, complex or pointer type.
Steve Naroffdd10e022007-08-23 21:37:33 +00008268 // Now make sure the operand is a modifiable lvalue.
John McCall09431682010-11-18 19:01:18 +00008269 if (CheckForModifiableLvalue(Op, OpLoc, S))
Reid Spencer5f016e22007-07-11 17:01:13 +00008270 return QualType();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00008271 // In C++, a prefix increment is the same type as the operand. Otherwise
8272 // (in C or with postfix), the increment is the unqualified type of the
8273 // operand.
John McCall09431682010-11-18 19:01:18 +00008274 if (isPrefix && S.getLangOptions().CPlusPlus) {
8275 VK = VK_LValue;
8276 return ResType;
8277 } else {
8278 VK = VK_RValue;
8279 return ResType.getUnqualifiedType();
8280 }
Reid Spencer5f016e22007-07-11 17:01:13 +00008281}
8282
John Wiegley429bb272011-04-08 18:41:53 +00008283ExprResult Sema::ConvertPropertyForRValue(Expr *E) {
John McCallf6a16482010-12-04 03:47:34 +00008284 assert(E->getValueKind() == VK_LValue &&
8285 E->getObjectKind() == OK_ObjCProperty);
8286 const ObjCPropertyRefExpr *PRE = E->getObjCProperty();
8287
8288 ExprValueKind VK = VK_RValue;
8289 if (PRE->isImplicitProperty()) {
Fariborz Jahanian99130e52010-12-22 19:46:35 +00008290 if (const ObjCMethodDecl *GetterMethod =
8291 PRE->getImplicitPropertyGetter()) {
8292 QualType Result = GetterMethod->getResultType();
8293 VK = Expr::getValueKindForType(Result);
8294 }
8295 else {
8296 Diag(PRE->getLocation(), diag::err_getter_not_found)
8297 << PRE->getBase()->getType();
8298 }
John McCallf6a16482010-12-04 03:47:34 +00008299 }
8300
8301 E = ImplicitCastExpr::Create(Context, E->getType(), CK_GetObjCProperty,
8302 E, 0, VK);
John McCalldb67e2f2010-12-10 01:49:45 +00008303
8304 ExprResult Result = MaybeBindToTemporary(E);
8305 if (!Result.isInvalid())
8306 E = Result.take();
John Wiegley429bb272011-04-08 18:41:53 +00008307
8308 return Owned(E);
John McCallf6a16482010-12-04 03:47:34 +00008309}
8310
John Wiegley429bb272011-04-08 18:41:53 +00008311void Sema::ConvertPropertyForLValue(ExprResult &LHS, ExprResult &RHS, QualType &LHSTy) {
8312 assert(LHS.get()->getValueKind() == VK_LValue &&
8313 LHS.get()->getObjectKind() == OK_ObjCProperty);
8314 const ObjCPropertyRefExpr *PropRef = LHS.get()->getObjCProperty();
John McCallf6a16482010-12-04 03:47:34 +00008315
John Wiegley429bb272011-04-08 18:41:53 +00008316 if (PropRef->isImplicitProperty()) {
John McCallf6a16482010-12-04 03:47:34 +00008317 // If using property-dot syntax notation for assignment, and there is a
8318 // setter, RHS expression is being passed to the setter argument. So,
8319 // type conversion (and comparison) is RHS to setter's argument type.
John Wiegley429bb272011-04-08 18:41:53 +00008320 if (const ObjCMethodDecl *SetterMD = PropRef->getImplicitPropertySetter()) {
John McCallf6a16482010-12-04 03:47:34 +00008321 ObjCMethodDecl::param_iterator P = SetterMD->param_begin();
8322 LHSTy = (*P)->getType();
8323
8324 // Otherwise, if the getter returns an l-value, just call that.
8325 } else {
John Wiegley429bb272011-04-08 18:41:53 +00008326 QualType Result = PropRef->getImplicitPropertyGetter()->getResultType();
John McCallf6a16482010-12-04 03:47:34 +00008327 ExprValueKind VK = Expr::getValueKindForType(Result);
8328 if (VK == VK_LValue) {
John Wiegley429bb272011-04-08 18:41:53 +00008329 LHS = ImplicitCastExpr::Create(Context, LHS.get()->getType(),
8330 CK_GetObjCProperty, LHS.take(), 0, VK);
John McCallf6a16482010-12-04 03:47:34 +00008331 return;
John McCall12f78a62010-12-02 01:19:52 +00008332 }
Fariborz Jahanianc4e1a682010-09-14 23:02:38 +00008333 }
John McCallf6a16482010-12-04 03:47:34 +00008334 }
8335
8336 if (getLangOptions().CPlusPlus && LHSTy->isRecordType()) {
Fariborz Jahanianc4e1a682010-09-14 23:02:38 +00008337 InitializedEntity Entity =
Fariborz Jahanian745da3a2010-09-24 17:30:16 +00008338 InitializedEntity::InitializeParameter(Context, LHSTy);
John Wiegley429bb272011-04-08 18:41:53 +00008339 ExprResult ArgE = PerformCopyInitialization(Entity, SourceLocation(), RHS);
Fariborz Jahanianc4e1a682010-09-14 23:02:38 +00008340 if (!ArgE.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00008341 RHS = ArgE;
Fariborz Jahanianc4e1a682010-09-14 23:02:38 +00008342 }
8343}
8344
8345
Anders Carlsson369dee42008-02-01 07:15:58 +00008346/// getPrimaryDecl - Helper function for CheckAddressOfOperand().
Reid Spencer5f016e22007-07-11 17:01:13 +00008347/// This routine allows us to typecheck complex/recursive expressions
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00008348/// where the declaration is needed for type checking. We only need to
8349/// handle cases when the expression references a function designator
8350/// or is an lvalue. Here are some examples:
8351/// - &(x) => x
8352/// - &*****f => f for f a function designator.
8353/// - &s.xx => s
8354/// - &s.zz[1].yy -> s, if zz is an array
8355/// - *(x + 1) -> x, if x is an array
8356/// - &"123"[2] -> 0
8357/// - & __real__ x -> x
John McCall5808ce42011-02-03 08:15:49 +00008358static ValueDecl *getPrimaryDecl(Expr *E) {
Chris Lattnerf0467b32008-04-02 04:24:33 +00008359 switch (E->getStmtClass()) {
Reid Spencer5f016e22007-07-11 17:01:13 +00008360 case Stmt::DeclRefExprClass:
Chris Lattnerf0467b32008-04-02 04:24:33 +00008361 return cast<DeclRefExpr>(E)->getDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +00008362 case Stmt::MemberExprClass:
Eli Friedman23d58ce2009-04-20 08:23:18 +00008363 // If this is an arrow operator, the address is an offset from
8364 // the base's value, so the object the base refers to is
8365 // irrelevant.
Chris Lattnerf0467b32008-04-02 04:24:33 +00008366 if (cast<MemberExpr>(E)->isArrow())
Chris Lattnerf82228f2007-11-16 17:46:48 +00008367 return 0;
Eli Friedman23d58ce2009-04-20 08:23:18 +00008368 // Otherwise, the expression refers to a part of the base
Chris Lattnerf0467b32008-04-02 04:24:33 +00008369 return getPrimaryDecl(cast<MemberExpr>(E)->getBase());
Anders Carlsson369dee42008-02-01 07:15:58 +00008370 case Stmt::ArraySubscriptExprClass: {
Mike Stump390b4cc2009-05-16 07:39:55 +00008371 // FIXME: This code shouldn't be necessary! We should catch the implicit
8372 // promotion of register arrays earlier.
Eli Friedman23d58ce2009-04-20 08:23:18 +00008373 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase();
8374 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) {
8375 if (ICE->getSubExpr()->getType()->isArrayType())
8376 return getPrimaryDecl(ICE->getSubExpr());
8377 }
8378 return 0;
Anders Carlsson369dee42008-02-01 07:15:58 +00008379 }
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00008380 case Stmt::UnaryOperatorClass: {
8381 UnaryOperator *UO = cast<UnaryOperator>(E);
Mike Stumpeed9cac2009-02-19 03:04:26 +00008382
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00008383 switch(UO->getOpcode()) {
John McCall2de56d12010-08-25 11:45:40 +00008384 case UO_Real:
8385 case UO_Imag:
8386 case UO_Extension:
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00008387 return getPrimaryDecl(UO->getSubExpr());
8388 default:
8389 return 0;
8390 }
8391 }
Reid Spencer5f016e22007-07-11 17:01:13 +00008392 case Stmt::ParenExprClass:
Chris Lattnerf0467b32008-04-02 04:24:33 +00008393 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr());
Chris Lattnerf82228f2007-11-16 17:46:48 +00008394 case Stmt::ImplicitCastExprClass:
Eli Friedman23d58ce2009-04-20 08:23:18 +00008395 // If the result of an implicit cast is an l-value, we care about
8396 // the sub-expression; otherwise, the result here doesn't matter.
Chris Lattnerf0467b32008-04-02 04:24:33 +00008397 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr());
Reid Spencer5f016e22007-07-11 17:01:13 +00008398 default:
8399 return 0;
8400 }
8401}
8402
8403/// CheckAddressOfOperand - The operand of & must be either a function
Mike Stumpeed9cac2009-02-19 03:04:26 +00008404/// designator or an lvalue designating an object. If it is an lvalue, the
Reid Spencer5f016e22007-07-11 17:01:13 +00008405/// object cannot be declared with storage class register or be a bit field.
Mike Stumpeed9cac2009-02-19 03:04:26 +00008406/// Note: The usual conversions are *not* applied to the operand of the &
Reid Spencer5f016e22007-07-11 17:01:13 +00008407/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue.
Mike Stumpeed9cac2009-02-19 03:04:26 +00008408/// In C++, the operand might be an overloaded function name, in which case
Douglas Gregor904eed32008-11-10 20:40:00 +00008409/// we allow the '&' but retain the overloaded-function type.
John McCall09431682010-11-18 19:01:18 +00008410static QualType CheckAddressOfOperand(Sema &S, Expr *OrigOp,
8411 SourceLocation OpLoc) {
John McCall9c72c602010-08-27 09:08:28 +00008412 if (OrigOp->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00008413 return S.Context.DependentTy;
8414 if (OrigOp->getType() == S.Context.OverloadTy)
8415 return S.Context.OverloadTy;
John McCall755d8492011-04-12 00:42:48 +00008416 if (OrigOp->getType() == S.Context.UnknownAnyTy)
8417 return S.Context.UnknownAnyTy;
John McCall864c0412011-04-26 20:42:42 +00008418 if (OrigOp->getType() == S.Context.BoundMemberTy) {
8419 S.Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
8420 << OrigOp->getSourceRange();
8421 return QualType();
8422 }
John McCall9c72c602010-08-27 09:08:28 +00008423
John McCall755d8492011-04-12 00:42:48 +00008424 assert(!OrigOp->getType()->isPlaceholderType());
John McCall2cd11fe2010-10-12 02:09:17 +00008425
John McCall9c72c602010-08-27 09:08:28 +00008426 // Make sure to ignore parentheses in subsequent checks
8427 Expr *op = OrigOp->IgnoreParens();
Douglas Gregor9103bb22008-12-17 22:52:20 +00008428
John McCall09431682010-11-18 19:01:18 +00008429 if (S.getLangOptions().C99) {
Steve Naroff08f19672008-01-13 17:10:08 +00008430 // Implement C99-only parts of addressof rules.
8431 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) {
John McCall2de56d12010-08-25 11:45:40 +00008432 if (uOp->getOpcode() == UO_Deref)
Steve Naroff08f19672008-01-13 17:10:08 +00008433 // Per C99 6.5.3.2, the address of a deref always returns a valid result
8434 // (assuming the deref expression is valid).
8435 return uOp->getSubExpr()->getType();
8436 }
8437 // Technically, there should be a check for array subscript
8438 // expressions here, but the result of one is always an lvalue anyway.
8439 }
John McCall5808ce42011-02-03 08:15:49 +00008440 ValueDecl *dcl = getPrimaryDecl(op);
John McCall7eb0a9e2010-11-24 05:12:34 +00008441 Expr::LValueClassification lval = op->ClassifyLValue(S.Context);
Nuno Lopes6b6609f2008-12-16 22:59:47 +00008442
Fariborz Jahanian077f4902011-03-26 19:48:30 +00008443 if (lval == Expr::LV_ClassTemporary) {
John McCall09431682010-11-18 19:01:18 +00008444 bool sfinae = S.isSFINAEContext();
8445 S.Diag(OpLoc, sfinae ? diag::err_typecheck_addrof_class_temporary
8446 : diag::ext_typecheck_addrof_class_temporary)
Douglas Gregore873fb72010-02-16 21:39:57 +00008447 << op->getType() << op->getSourceRange();
John McCall09431682010-11-18 19:01:18 +00008448 if (sfinae)
Douglas Gregore873fb72010-02-16 21:39:57 +00008449 return QualType();
John McCall9c72c602010-08-27 09:08:28 +00008450 } else if (isa<ObjCSelectorExpr>(op)) {
John McCall09431682010-11-18 19:01:18 +00008451 return S.Context.getPointerType(op->getType());
John McCall9c72c602010-08-27 09:08:28 +00008452 } else if (lval == Expr::LV_MemberFunction) {
8453 // If it's an instance method, make a member pointer.
8454 // The expression must have exactly the form &A::foo.
8455
8456 // If the underlying expression isn't a decl ref, give up.
8457 if (!isa<DeclRefExpr>(op)) {
John McCall09431682010-11-18 19:01:18 +00008458 S.Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
John McCall9c72c602010-08-27 09:08:28 +00008459 << OrigOp->getSourceRange();
8460 return QualType();
8461 }
8462 DeclRefExpr *DRE = cast<DeclRefExpr>(op);
8463 CXXMethodDecl *MD = cast<CXXMethodDecl>(DRE->getDecl());
8464
8465 // The id-expression was parenthesized.
8466 if (OrigOp != DRE) {
John McCall09431682010-11-18 19:01:18 +00008467 S.Diag(OpLoc, diag::err_parens_pointer_member_function)
John McCall9c72c602010-08-27 09:08:28 +00008468 << OrigOp->getSourceRange();
8469
8470 // The method was named without a qualifier.
8471 } else if (!DRE->getQualifier()) {
John McCall09431682010-11-18 19:01:18 +00008472 S.Diag(OpLoc, diag::err_unqualified_pointer_member_function)
John McCall9c72c602010-08-27 09:08:28 +00008473 << op->getSourceRange();
8474 }
8475
John McCall09431682010-11-18 19:01:18 +00008476 return S.Context.getMemberPointerType(op->getType(),
8477 S.Context.getTypeDeclType(MD->getParent()).getTypePtr());
John McCall9c72c602010-08-27 09:08:28 +00008478 } else if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) {
Eli Friedman441cf102009-05-16 23:27:50 +00008479 // C99 6.5.3.2p1
Eli Friedman23d58ce2009-04-20 08:23:18 +00008480 // The operand must be either an l-value or a function designator
Eli Friedman441cf102009-05-16 23:27:50 +00008481 if (!op->getType()->isFunctionType()) {
Chris Lattnerf82228f2007-11-16 17:46:48 +00008482 // FIXME: emit more specific diag...
John McCall09431682010-11-18 19:01:18 +00008483 S.Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof)
Chris Lattnerdcd5ef12008-11-19 05:27:50 +00008484 << op->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00008485 return QualType();
8486 }
John McCall7eb0a9e2010-11-24 05:12:34 +00008487 } else if (op->getObjectKind() == OK_BitField) { // C99 6.5.3.2p1
Eli Friedman23d58ce2009-04-20 08:23:18 +00008488 // The operand cannot be a bit-field
John McCall09431682010-11-18 19:01:18 +00008489 S.Diag(OpLoc, diag::err_typecheck_address_of)
Eli Friedman23d58ce2009-04-20 08:23:18 +00008490 << "bit-field" << op->getSourceRange();
Douglas Gregor86f19402008-12-20 23:49:58 +00008491 return QualType();
John McCall7eb0a9e2010-11-24 05:12:34 +00008492 } else if (op->getObjectKind() == OK_VectorComponent) {
Eli Friedman23d58ce2009-04-20 08:23:18 +00008493 // The operand cannot be an element of a vector
John McCall09431682010-11-18 19:01:18 +00008494 S.Diag(OpLoc, diag::err_typecheck_address_of)
Nate Begemanb104b1f2009-02-15 22:45:20 +00008495 << "vector element" << op->getSourceRange();
Steve Naroffbcb2b612008-02-29 23:30:25 +00008496 return QualType();
John McCall7eb0a9e2010-11-24 05:12:34 +00008497 } else if (op->getObjectKind() == OK_ObjCProperty) {
Fariborz Jahanian0337f212009-07-07 18:50:52 +00008498 // cannot take address of a property expression.
John McCall09431682010-11-18 19:01:18 +00008499 S.Diag(OpLoc, diag::err_typecheck_address_of)
Fariborz Jahanian0337f212009-07-07 18:50:52 +00008500 << "property expression" << op->getSourceRange();
8501 return QualType();
Steve Naroffbcb2b612008-02-29 23:30:25 +00008502 } else if (dcl) { // C99 6.5.3.2p1
Mike Stumpeed9cac2009-02-19 03:04:26 +00008503 // We have an lvalue with a decl. Make sure the decl is not declared
Reid Spencer5f016e22007-07-11 17:01:13 +00008504 // with the register storage-class specifier.
8505 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) {
Fariborz Jahanian4020f872010-08-24 22:21:48 +00008506 // in C++ it is not error to take address of a register
8507 // variable (c++03 7.1.1P3)
John McCalld931b082010-08-26 03:08:43 +00008508 if (vd->getStorageClass() == SC_Register &&
John McCall09431682010-11-18 19:01:18 +00008509 !S.getLangOptions().CPlusPlus) {
8510 S.Diag(OpLoc, diag::err_typecheck_address_of)
Chris Lattnerd3a94e22008-11-20 06:06:08 +00008511 << "register variable" << op->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00008512 return QualType();
8513 }
John McCallba135432009-11-21 08:51:07 +00008514 } else if (isa<FunctionTemplateDecl>(dcl)) {
John McCall09431682010-11-18 19:01:18 +00008515 return S.Context.OverloadTy;
John McCall5808ce42011-02-03 08:15:49 +00008516 } else if (isa<FieldDecl>(dcl) || isa<IndirectFieldDecl>(dcl)) {
Douglas Gregor29882052008-12-10 21:26:49 +00008517 // Okay: we can take the address of a field.
Sebastian Redlebc07d52009-02-03 20:19:35 +00008518 // Could be a pointer to member, though, if there is an explicit
8519 // scope qualifier for the class.
Douglas Gregora2813ce2009-10-23 18:54:35 +00008520 if (isa<DeclRefExpr>(op) && cast<DeclRefExpr>(op)->getQualifier()) {
Sebastian Redlebc07d52009-02-03 20:19:35 +00008521 DeclContext *Ctx = dcl->getDeclContext();
Anders Carlssonf9e48bd2009-07-08 21:45:58 +00008522 if (Ctx && Ctx->isRecord()) {
John McCall5808ce42011-02-03 08:15:49 +00008523 if (dcl->getType()->isReferenceType()) {
John McCall09431682010-11-18 19:01:18 +00008524 S.Diag(OpLoc,
8525 diag::err_cannot_form_pointer_to_member_of_reference_type)
John McCall5808ce42011-02-03 08:15:49 +00008526 << dcl->getDeclName() << dcl->getType();
Anders Carlssonf9e48bd2009-07-08 21:45:58 +00008527 return QualType();
8528 }
Mike Stump1eb44332009-09-09 15:08:12 +00008529
Argyrios Kyrtzidis0413db42011-01-31 07:04:29 +00008530 while (cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion())
8531 Ctx = Ctx->getParent();
John McCall09431682010-11-18 19:01:18 +00008532 return S.Context.getMemberPointerType(op->getType(),
8533 S.Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr());
Anders Carlssonf9e48bd2009-07-08 21:45:58 +00008534 }
Sebastian Redlebc07d52009-02-03 20:19:35 +00008535 }
Anders Carlsson196f7d02009-05-16 21:43:42 +00008536 } else if (!isa<FunctionDecl>(dcl))
Reid Spencer5f016e22007-07-11 17:01:13 +00008537 assert(0 && "Unknown/unexpected decl type");
Reid Spencer5f016e22007-07-11 17:01:13 +00008538 }
Sebastian Redl33b399a2009-02-04 21:23:32 +00008539
Eli Friedman441cf102009-05-16 23:27:50 +00008540 if (lval == Expr::LV_IncompleteVoidType) {
8541 // Taking the address of a void variable is technically illegal, but we
8542 // allow it in cases which are otherwise valid.
8543 // Example: "extern void x; void* y = &x;".
John McCall09431682010-11-18 19:01:18 +00008544 S.Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange();
Eli Friedman441cf102009-05-16 23:27:50 +00008545 }
8546
Reid Spencer5f016e22007-07-11 17:01:13 +00008547 // If the operand has type "type", the result has type "pointer to type".
Douglas Gregor8f70ddb2010-07-29 16:05:45 +00008548 if (op->getType()->isObjCObjectType())
John McCall09431682010-11-18 19:01:18 +00008549 return S.Context.getObjCObjectPointerType(op->getType());
8550 return S.Context.getPointerType(op->getType());
Reid Spencer5f016e22007-07-11 17:01:13 +00008551}
8552
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00008553/// CheckIndirectionOperand - Type check unary indirection (prefix '*').
John McCall09431682010-11-18 19:01:18 +00008554static QualType CheckIndirectionOperand(Sema &S, Expr *Op, ExprValueKind &VK,
8555 SourceLocation OpLoc) {
Sebastian Redl28507842009-02-26 14:39:58 +00008556 if (Op->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00008557 return S.Context.DependentTy;
Sebastian Redl28507842009-02-26 14:39:58 +00008558
John Wiegley429bb272011-04-08 18:41:53 +00008559 ExprResult ConvResult = S.UsualUnaryConversions(Op);
8560 if (ConvResult.isInvalid())
8561 return QualType();
8562 Op = ConvResult.take();
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00008563 QualType OpTy = Op->getType();
8564 QualType Result;
Argyrios Kyrtzidisf4bbbf02011-05-02 18:21:19 +00008565
8566 if (isa<CXXReinterpretCastExpr>(Op)) {
8567 QualType OpOrigType = Op->IgnoreParenCasts()->getType();
8568 S.CheckCompatibleReinterpretCast(OpOrigType, OpTy, /*IsDereference*/true,
8569 Op->getSourceRange());
8570 }
8571
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00008572 // Note that per both C89 and C99, indirection is always legal, even if OpTy
8573 // is an incomplete type or void. It would be possible to warn about
8574 // dereferencing a void pointer, but it's completely well-defined, and such a
8575 // warning is unlikely to catch any mistakes.
8576 if (const PointerType *PT = OpTy->getAs<PointerType>())
8577 Result = PT->getPointeeType();
8578 else if (const ObjCObjectPointerType *OPT =
8579 OpTy->getAs<ObjCObjectPointerType>())
8580 Result = OPT->getPointeeType();
John McCall2cd11fe2010-10-12 02:09:17 +00008581 else {
John McCallfb8721c2011-04-10 19:13:55 +00008582 ExprResult PR = S.CheckPlaceholderExpr(Op);
John McCall2cd11fe2010-10-12 02:09:17 +00008583 if (PR.isInvalid()) return QualType();
John McCall09431682010-11-18 19:01:18 +00008584 if (PR.take() != Op)
8585 return CheckIndirectionOperand(S, PR.take(), VK, OpLoc);
John McCall2cd11fe2010-10-12 02:09:17 +00008586 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008587
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00008588 if (Result.isNull()) {
John McCall09431682010-11-18 19:01:18 +00008589 S.Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer)
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00008590 << OpTy << Op->getSourceRange();
8591 return QualType();
8592 }
John McCall09431682010-11-18 19:01:18 +00008593
8594 // Dereferences are usually l-values...
8595 VK = VK_LValue;
8596
8597 // ...except that certain expressions are never l-values in C.
8598 if (!S.getLangOptions().CPlusPlus &&
8599 IsCForbiddenLValueType(S.Context, Result))
8600 VK = VK_RValue;
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00008601
8602 return Result;
Reid Spencer5f016e22007-07-11 17:01:13 +00008603}
8604
John McCall2de56d12010-08-25 11:45:40 +00008605static inline BinaryOperatorKind ConvertTokenKindToBinaryOpcode(
Reid Spencer5f016e22007-07-11 17:01:13 +00008606 tok::TokenKind Kind) {
John McCall2de56d12010-08-25 11:45:40 +00008607 BinaryOperatorKind Opc;
Reid Spencer5f016e22007-07-11 17:01:13 +00008608 switch (Kind) {
8609 default: assert(0 && "Unknown binop!");
John McCall2de56d12010-08-25 11:45:40 +00008610 case tok::periodstar: Opc = BO_PtrMemD; break;
8611 case tok::arrowstar: Opc = BO_PtrMemI; break;
8612 case tok::star: Opc = BO_Mul; break;
8613 case tok::slash: Opc = BO_Div; break;
8614 case tok::percent: Opc = BO_Rem; break;
8615 case tok::plus: Opc = BO_Add; break;
8616 case tok::minus: Opc = BO_Sub; break;
8617 case tok::lessless: Opc = BO_Shl; break;
8618 case tok::greatergreater: Opc = BO_Shr; break;
8619 case tok::lessequal: Opc = BO_LE; break;
8620 case tok::less: Opc = BO_LT; break;
8621 case tok::greaterequal: Opc = BO_GE; break;
8622 case tok::greater: Opc = BO_GT; break;
8623 case tok::exclaimequal: Opc = BO_NE; break;
8624 case tok::equalequal: Opc = BO_EQ; break;
8625 case tok::amp: Opc = BO_And; break;
8626 case tok::caret: Opc = BO_Xor; break;
8627 case tok::pipe: Opc = BO_Or; break;
8628 case tok::ampamp: Opc = BO_LAnd; break;
8629 case tok::pipepipe: Opc = BO_LOr; break;
8630 case tok::equal: Opc = BO_Assign; break;
8631 case tok::starequal: Opc = BO_MulAssign; break;
8632 case tok::slashequal: Opc = BO_DivAssign; break;
8633 case tok::percentequal: Opc = BO_RemAssign; break;
8634 case tok::plusequal: Opc = BO_AddAssign; break;
8635 case tok::minusequal: Opc = BO_SubAssign; break;
8636 case tok::lesslessequal: Opc = BO_ShlAssign; break;
8637 case tok::greatergreaterequal: Opc = BO_ShrAssign; break;
8638 case tok::ampequal: Opc = BO_AndAssign; break;
8639 case tok::caretequal: Opc = BO_XorAssign; break;
8640 case tok::pipeequal: Opc = BO_OrAssign; break;
8641 case tok::comma: Opc = BO_Comma; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00008642 }
8643 return Opc;
8644}
8645
John McCall2de56d12010-08-25 11:45:40 +00008646static inline UnaryOperatorKind ConvertTokenKindToUnaryOpcode(
Reid Spencer5f016e22007-07-11 17:01:13 +00008647 tok::TokenKind Kind) {
John McCall2de56d12010-08-25 11:45:40 +00008648 UnaryOperatorKind Opc;
Reid Spencer5f016e22007-07-11 17:01:13 +00008649 switch (Kind) {
8650 default: assert(0 && "Unknown unary op!");
John McCall2de56d12010-08-25 11:45:40 +00008651 case tok::plusplus: Opc = UO_PreInc; break;
8652 case tok::minusminus: Opc = UO_PreDec; break;
8653 case tok::amp: Opc = UO_AddrOf; break;
8654 case tok::star: Opc = UO_Deref; break;
8655 case tok::plus: Opc = UO_Plus; break;
8656 case tok::minus: Opc = UO_Minus; break;
8657 case tok::tilde: Opc = UO_Not; break;
8658 case tok::exclaim: Opc = UO_LNot; break;
8659 case tok::kw___real: Opc = UO_Real; break;
8660 case tok::kw___imag: Opc = UO_Imag; break;
8661 case tok::kw___extension__: Opc = UO_Extension; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00008662 }
8663 return Opc;
8664}
8665
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00008666/// DiagnoseSelfAssignment - Emits a warning if a value is assigned to itself.
8667/// This warning is only emitted for builtin assignment operations. It is also
8668/// suppressed in the event of macro expansions.
8669static void DiagnoseSelfAssignment(Sema &S, Expr *lhs, Expr *rhs,
8670 SourceLocation OpLoc) {
8671 if (!S.ActiveTemplateInstantiations.empty())
8672 return;
8673 if (OpLoc.isInvalid() || OpLoc.isMacroID())
8674 return;
8675 lhs = lhs->IgnoreParenImpCasts();
8676 rhs = rhs->IgnoreParenImpCasts();
8677 const DeclRefExpr *LeftDeclRef = dyn_cast<DeclRefExpr>(lhs);
8678 const DeclRefExpr *RightDeclRef = dyn_cast<DeclRefExpr>(rhs);
8679 if (!LeftDeclRef || !RightDeclRef ||
8680 LeftDeclRef->getLocation().isMacroID() ||
8681 RightDeclRef->getLocation().isMacroID())
8682 return;
8683 const ValueDecl *LeftDecl =
8684 cast<ValueDecl>(LeftDeclRef->getDecl()->getCanonicalDecl());
8685 const ValueDecl *RightDecl =
8686 cast<ValueDecl>(RightDeclRef->getDecl()->getCanonicalDecl());
8687 if (LeftDecl != RightDecl)
8688 return;
8689 if (LeftDecl->getType().isVolatileQualified())
8690 return;
8691 if (const ReferenceType *RefTy = LeftDecl->getType()->getAs<ReferenceType>())
8692 if (RefTy->getPointeeType().isVolatileQualified())
8693 return;
8694
8695 S.Diag(OpLoc, diag::warn_self_assignment)
8696 << LeftDeclRef->getType()
8697 << lhs->getSourceRange() << rhs->getSourceRange();
8698}
8699
Douglas Gregoreaebc752008-11-06 23:29:22 +00008700/// CreateBuiltinBinOp - Creates a new built-in binary operation with
8701/// operator @p Opc at location @c TokLoc. This routine only supports
8702/// built-in operations; ActOnBinOp handles overloaded operators.
John McCall60d7b3a2010-08-24 06:29:42 +00008703ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc,
Argyrios Kyrtzidisb1fa3dc2011-01-05 20:09:36 +00008704 BinaryOperatorKind Opc,
John Wiegley429bb272011-04-08 18:41:53 +00008705 Expr *lhsExpr, Expr *rhsExpr) {
8706 ExprResult lhs = Owned(lhsExpr), rhs = Owned(rhsExpr);
Eli Friedmanab3a8522009-03-28 01:22:36 +00008707 QualType ResultTy; // Result type of the binary operator.
Eli Friedmanab3a8522009-03-28 01:22:36 +00008708 // The following two variables are used for compound assignment operators
8709 QualType CompLHSTy; // Type of LHS after promotions for computation
8710 QualType CompResultTy; // Type of computation result
John McCallf89e55a2010-11-18 06:31:45 +00008711 ExprValueKind VK = VK_RValue;
8712 ExprObjectKind OK = OK_Ordinary;
Douglas Gregoreaebc752008-11-06 23:29:22 +00008713
Douglas Gregorfadb53b2011-03-12 01:48:56 +00008714 // Check if a 'foo<int>' involved in a binary op, identifies a single
8715 // function unambiguously (i.e. an lvalue ala 13.4)
8716 // But since an assignment can trigger target based overload, exclude it in
8717 // our blind search. i.e:
8718 // template<class T> void f(); template<class T, class U> void f(U);
8719 // f<int> == 0; // resolve f<int> blindly
8720 // void (*p)(int); p = f<int>; // resolve f<int> using target
8721 if (Opc != BO_Assign) {
John McCallfb8721c2011-04-10 19:13:55 +00008722 ExprResult resolvedLHS = CheckPlaceholderExpr(lhs.get());
John McCall1de4d4e2011-04-07 08:22:57 +00008723 if (!resolvedLHS.isUsable()) return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00008724 lhs = move(resolvedLHS);
John McCall1de4d4e2011-04-07 08:22:57 +00008725
John McCallfb8721c2011-04-10 19:13:55 +00008726 ExprResult resolvedRHS = CheckPlaceholderExpr(rhs.get());
John McCall1de4d4e2011-04-07 08:22:57 +00008727 if (!resolvedRHS.isUsable()) return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00008728 rhs = move(resolvedRHS);
Douglas Gregorfadb53b2011-03-12 01:48:56 +00008729 }
8730
Douglas Gregoreaebc752008-11-06 23:29:22 +00008731 switch (Opc) {
John McCall2de56d12010-08-25 11:45:40 +00008732 case BO_Assign:
John Wiegley429bb272011-04-08 18:41:53 +00008733 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, QualType());
John McCallf6a16482010-12-04 03:47:34 +00008734 if (getLangOptions().CPlusPlus &&
John Wiegley429bb272011-04-08 18:41:53 +00008735 lhs.get()->getObjectKind() != OK_ObjCProperty) {
8736 VK = lhs.get()->getValueKind();
8737 OK = lhs.get()->getObjectKind();
John McCallf89e55a2010-11-18 06:31:45 +00008738 }
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00008739 if (!ResultTy.isNull())
John Wiegley429bb272011-04-08 18:41:53 +00008740 DiagnoseSelfAssignment(*this, lhs.get(), rhs.get(), OpLoc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00008741 break;
John McCall2de56d12010-08-25 11:45:40 +00008742 case BO_PtrMemD:
8743 case BO_PtrMemI:
John McCallf89e55a2010-11-18 06:31:45 +00008744 ResultTy = CheckPointerToMemberOperands(lhs, rhs, VK, OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00008745 Opc == BO_PtrMemI);
Sebastian Redl22460502009-02-07 00:15:38 +00008746 break;
John McCall2de56d12010-08-25 11:45:40 +00008747 case BO_Mul:
8748 case BO_Div:
Chris Lattner7ef655a2010-01-12 21:23:57 +00008749 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, false,
John McCall2de56d12010-08-25 11:45:40 +00008750 Opc == BO_Div);
Douglas Gregoreaebc752008-11-06 23:29:22 +00008751 break;
John McCall2de56d12010-08-25 11:45:40 +00008752 case BO_Rem:
Douglas Gregoreaebc752008-11-06 23:29:22 +00008753 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc);
8754 break;
John McCall2de56d12010-08-25 11:45:40 +00008755 case BO_Add:
Douglas Gregoreaebc752008-11-06 23:29:22 +00008756 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc);
8757 break;
John McCall2de56d12010-08-25 11:45:40 +00008758 case BO_Sub:
Douglas Gregoreaebc752008-11-06 23:29:22 +00008759 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc);
8760 break;
John McCall2de56d12010-08-25 11:45:40 +00008761 case BO_Shl:
8762 case BO_Shr:
Chandler Carruth21206d52011-02-23 23:34:11 +00008763 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc, Opc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00008764 break;
John McCall2de56d12010-08-25 11:45:40 +00008765 case BO_LE:
8766 case BO_LT:
8767 case BO_GE:
8768 case BO_GT:
Douglas Gregora86b8322009-04-06 18:45:53 +00008769 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true);
Douglas Gregoreaebc752008-11-06 23:29:22 +00008770 break;
John McCall2de56d12010-08-25 11:45:40 +00008771 case BO_EQ:
8772 case BO_NE:
Douglas Gregora86b8322009-04-06 18:45:53 +00008773 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false);
Douglas Gregoreaebc752008-11-06 23:29:22 +00008774 break;
John McCall2de56d12010-08-25 11:45:40 +00008775 case BO_And:
8776 case BO_Xor:
8777 case BO_Or:
Douglas Gregoreaebc752008-11-06 23:29:22 +00008778 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc);
8779 break;
John McCall2de56d12010-08-25 11:45:40 +00008780 case BO_LAnd:
8781 case BO_LOr:
Chris Lattner90a8f272010-07-13 19:41:32 +00008782 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc, Opc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00008783 break;
John McCall2de56d12010-08-25 11:45:40 +00008784 case BO_MulAssign:
8785 case BO_DivAssign:
Chris Lattner7ef655a2010-01-12 21:23:57 +00008786 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true,
John McCallf89e55a2010-11-18 06:31:45 +00008787 Opc == BO_DivAssign);
Eli Friedmanab3a8522009-03-28 01:22:36 +00008788 CompLHSTy = CompResultTy;
John Wiegley429bb272011-04-08 18:41:53 +00008789 if (!CompResultTy.isNull() && !lhs.isInvalid() && !rhs.isInvalid())
8790 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00008791 break;
John McCall2de56d12010-08-25 11:45:40 +00008792 case BO_RemAssign:
Eli Friedmanab3a8522009-03-28 01:22:36 +00008793 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true);
8794 CompLHSTy = CompResultTy;
John Wiegley429bb272011-04-08 18:41:53 +00008795 if (!CompResultTy.isNull() && !lhs.isInvalid() && !rhs.isInvalid())
8796 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00008797 break;
John McCall2de56d12010-08-25 11:45:40 +00008798 case BO_AddAssign:
Eli Friedmanab3a8522009-03-28 01:22:36 +00008799 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy);
John Wiegley429bb272011-04-08 18:41:53 +00008800 if (!CompResultTy.isNull() && !lhs.isInvalid() && !rhs.isInvalid())
8801 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00008802 break;
John McCall2de56d12010-08-25 11:45:40 +00008803 case BO_SubAssign:
Eli Friedmanab3a8522009-03-28 01:22:36 +00008804 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy);
John Wiegley429bb272011-04-08 18:41:53 +00008805 if (!CompResultTy.isNull() && !lhs.isInvalid() && !rhs.isInvalid())
8806 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00008807 break;
John McCall2de56d12010-08-25 11:45:40 +00008808 case BO_ShlAssign:
8809 case BO_ShrAssign:
Chandler Carruth21206d52011-02-23 23:34:11 +00008810 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, Opc, true);
Eli Friedmanab3a8522009-03-28 01:22:36 +00008811 CompLHSTy = CompResultTy;
John Wiegley429bb272011-04-08 18:41:53 +00008812 if (!CompResultTy.isNull() && !lhs.isInvalid() && !rhs.isInvalid())
8813 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00008814 break;
John McCall2de56d12010-08-25 11:45:40 +00008815 case BO_AndAssign:
8816 case BO_XorAssign:
8817 case BO_OrAssign:
Eli Friedmanab3a8522009-03-28 01:22:36 +00008818 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true);
8819 CompLHSTy = CompResultTy;
John Wiegley429bb272011-04-08 18:41:53 +00008820 if (!CompResultTy.isNull() && !lhs.isInvalid() && !rhs.isInvalid())
8821 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00008822 break;
John McCall2de56d12010-08-25 11:45:40 +00008823 case BO_Comma:
John McCall09431682010-11-18 19:01:18 +00008824 ResultTy = CheckCommaOperands(*this, lhs, rhs, OpLoc);
John Wiegley429bb272011-04-08 18:41:53 +00008825 if (getLangOptions().CPlusPlus && !rhs.isInvalid()) {
8826 VK = rhs.get()->getValueKind();
8827 OK = rhs.get()->getObjectKind();
John McCallf89e55a2010-11-18 06:31:45 +00008828 }
Douglas Gregoreaebc752008-11-06 23:29:22 +00008829 break;
8830 }
John Wiegley429bb272011-04-08 18:41:53 +00008831 if (ResultTy.isNull() || lhs.isInvalid() || rhs.isInvalid())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00008832 return ExprError();
Eli Friedmanab3a8522009-03-28 01:22:36 +00008833 if (CompResultTy.isNull())
John Wiegley429bb272011-04-08 18:41:53 +00008834 return Owned(new (Context) BinaryOperator(lhs.take(), rhs.take(), Opc,
8835 ResultTy, VK, OK, OpLoc));
8836 if (getLangOptions().CPlusPlus && lhs.get()->getObjectKind() != OK_ObjCProperty) {
John McCallf89e55a2010-11-18 06:31:45 +00008837 VK = VK_LValue;
John Wiegley429bb272011-04-08 18:41:53 +00008838 OK = lhs.get()->getObjectKind();
John McCallf89e55a2010-11-18 06:31:45 +00008839 }
John Wiegley429bb272011-04-08 18:41:53 +00008840 return Owned(new (Context) CompoundAssignOperator(lhs.take(), rhs.take(), Opc,
8841 ResultTy, VK, OK, CompLHSTy,
John McCallf89e55a2010-11-18 06:31:45 +00008842 CompResultTy, OpLoc));
Douglas Gregoreaebc752008-11-06 23:29:22 +00008843}
8844
Sebastian Redlaee3c932009-10-27 12:10:02 +00008845/// DiagnoseBitwisePrecedence - Emit a warning when bitwise and comparison
8846/// operators are mixed in a way that suggests that the programmer forgot that
8847/// comparison operators have higher precedence. The most typical example of
8848/// such code is "flags & 0x0020 != 0", which is equivalent to "flags & 1".
John McCall2de56d12010-08-25 11:45:40 +00008849static void DiagnoseBitwisePrecedence(Sema &Self, BinaryOperatorKind Opc,
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00008850 SourceLocation OpLoc,Expr *lhs,Expr *rhs){
Sebastian Redlaee3c932009-10-27 12:10:02 +00008851 typedef BinaryOperator BinOp;
8852 BinOp::Opcode lhsopc = static_cast<BinOp::Opcode>(-1),
8853 rhsopc = static_cast<BinOp::Opcode>(-1);
8854 if (BinOp *BO = dyn_cast<BinOp>(lhs))
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00008855 lhsopc = BO->getOpcode();
Sebastian Redlaee3c932009-10-27 12:10:02 +00008856 if (BinOp *BO = dyn_cast<BinOp>(rhs))
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00008857 rhsopc = BO->getOpcode();
8858
8859 // Subs are not binary operators.
8860 if (lhsopc == -1 && rhsopc == -1)
8861 return;
8862
8863 // Bitwise operations are sometimes used as eager logical ops.
8864 // Don't diagnose this.
Sebastian Redlaee3c932009-10-27 12:10:02 +00008865 if ((BinOp::isComparisonOp(lhsopc) || BinOp::isBitwiseOp(lhsopc)) &&
8866 (BinOp::isComparisonOp(rhsopc) || BinOp::isBitwiseOp(rhsopc)))
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00008867 return;
8868
Sebastian Redlaee3c932009-10-27 12:10:02 +00008869 if (BinOp::isComparisonOp(lhsopc))
Sebastian Redl6b169ac2009-10-26 17:01:32 +00008870 SuggestParentheses(Self, OpLoc,
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00008871 Self.PDiag(diag::warn_precedence_bitwise_rel)
Sebastian Redlaee3c932009-10-27 12:10:02 +00008872 << SourceRange(lhs->getLocStart(), OpLoc)
8873 << BinOp::getOpcodeStr(Opc) << BinOp::getOpcodeStr(lhsopc),
Douglas Gregor55b38842010-04-14 16:09:52 +00008874 Self.PDiag(diag::note_precedence_bitwise_silence)
8875 << BinOp::getOpcodeStr(lhsopc),
Argyrios Kyrtzidisabdd3b32011-04-25 23:01:29 +00008876 lhs->getSourceRange(),
8877 Self.PDiag(diag::note_precedence_bitwise_first)
8878 << BinOp::getOpcodeStr(Opc),
8879 SourceRange(cast<BinOp>(lhs)->getRHS()->getLocStart(), rhs->getLocEnd()));
Sebastian Redlaee3c932009-10-27 12:10:02 +00008880 else if (BinOp::isComparisonOp(rhsopc))
Sebastian Redl6b169ac2009-10-26 17:01:32 +00008881 SuggestParentheses(Self, OpLoc,
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00008882 Self.PDiag(diag::warn_precedence_bitwise_rel)
Sebastian Redlaee3c932009-10-27 12:10:02 +00008883 << SourceRange(OpLoc, rhs->getLocEnd())
8884 << BinOp::getOpcodeStr(Opc) << BinOp::getOpcodeStr(rhsopc),
Argyrios Kyrtzidisabdd3b32011-04-25 23:01:29 +00008885 Self.PDiag(diag::note_precedence_bitwise_silence)
8886 << BinOp::getOpcodeStr(rhsopc),
8887 rhs->getSourceRange(),
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00008888 Self.PDiag(diag::note_precedence_bitwise_first)
Douglas Gregor827feec2010-01-08 00:20:23 +00008889 << BinOp::getOpcodeStr(Opc),
Argyrios Kyrtzidisabdd3b32011-04-25 23:01:29 +00008890 SourceRange(lhs->getLocEnd(), cast<BinOp>(rhs)->getLHS()->getLocStart()));
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00008891}
8892
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00008893/// \brief It accepts a '&&' expr that is inside a '||' one.
8894/// Emit a diagnostic together with a fixit hint that wraps the '&&' expression
8895/// in parentheses.
8896static void
8897EmitDiagnosticForLogicalAndInLogicalOr(Sema &Self, SourceLocation OpLoc,
Argyrios Kyrtzidisa61aedc2011-04-22 19:16:27 +00008898 BinaryOperator *Bop) {
8899 assert(Bop->getOpcode() == BO_LAnd);
8900 SuggestParentheses(Self, Bop->getOperatorLoc(),
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00008901 Self.PDiag(diag::warn_logical_and_in_logical_or)
Argyrios Kyrtzidisa61aedc2011-04-22 19:16:27 +00008902 << Bop->getSourceRange() << OpLoc,
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00008903 Self.PDiag(diag::note_logical_and_in_logical_or_silence),
Argyrios Kyrtzidisa61aedc2011-04-22 19:16:27 +00008904 Bop->getSourceRange(),
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00008905 Self.PDiag(0), SourceRange());
8906}
8907
8908/// \brief Returns true if the given expression can be evaluated as a constant
8909/// 'true'.
8910static bool EvaluatesAsTrue(Sema &S, Expr *E) {
8911 bool Res;
8912 return E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && Res;
8913}
8914
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00008915/// \brief Returns true if the given expression can be evaluated as a constant
8916/// 'false'.
8917static bool EvaluatesAsFalse(Sema &S, Expr *E) {
8918 bool Res;
8919 return E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && !Res;
8920}
8921
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00008922/// \brief Look for '&&' in the left hand of a '||' expr.
8923static void DiagnoseLogicalAndInLogicalOrLHS(Sema &S, SourceLocation OpLoc,
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00008924 Expr *OrLHS, Expr *OrRHS) {
8925 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(OrLHS)) {
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00008926 if (Bop->getOpcode() == BO_LAnd) {
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00008927 // If it's "a && b || 0" don't warn since the precedence doesn't matter.
8928 if (EvaluatesAsFalse(S, OrRHS))
8929 return;
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00008930 // If it's "1 && a || b" don't warn since the precedence doesn't matter.
8931 if (!EvaluatesAsTrue(S, Bop->getLHS()))
8932 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
8933 } else if (Bop->getOpcode() == BO_LOr) {
8934 if (BinaryOperator *RBop = dyn_cast<BinaryOperator>(Bop->getRHS())) {
8935 // If it's "a || b && 1 || c" we didn't warn earlier for
8936 // "a || b && 1", but warn now.
8937 if (RBop->getOpcode() == BO_LAnd && EvaluatesAsTrue(S, RBop->getRHS()))
8938 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, RBop);
8939 }
8940 }
8941 }
8942}
8943
8944/// \brief Look for '&&' in the right hand of a '||' expr.
8945static void DiagnoseLogicalAndInLogicalOrRHS(Sema &S, SourceLocation OpLoc,
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00008946 Expr *OrLHS, Expr *OrRHS) {
8947 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(OrRHS)) {
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00008948 if (Bop->getOpcode() == BO_LAnd) {
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00008949 // If it's "0 || a && b" don't warn since the precedence doesn't matter.
8950 if (EvaluatesAsFalse(S, OrLHS))
8951 return;
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00008952 // If it's "a || b && 1" don't warn since the precedence doesn't matter.
8953 if (!EvaluatesAsTrue(S, Bop->getRHS()))
8954 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00008955 }
8956 }
8957}
8958
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00008959/// DiagnoseBinOpPrecedence - Emit warnings for expressions with tricky
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00008960/// precedence.
John McCall2de56d12010-08-25 11:45:40 +00008961static void DiagnoseBinOpPrecedence(Sema &Self, BinaryOperatorKind Opc,
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00008962 SourceLocation OpLoc, Expr *lhs, Expr *rhs){
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00008963 // Diagnose "arg1 'bitwise' arg2 'eq' arg3".
Sebastian Redlaee3c932009-10-27 12:10:02 +00008964 if (BinaryOperator::isBitwiseOp(Opc))
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00008965 return DiagnoseBitwisePrecedence(Self, Opc, OpLoc, lhs, rhs);
8966
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00008967 // Warn about arg1 || arg2 && arg3, as GCC 4.3+ does.
8968 // We don't warn for 'assert(a || b && "bad")' since this is safe.
Argyrios Kyrtzidisd92ccaa2010-11-17 18:54:22 +00008969 if (Opc == BO_LOr && !OpLoc.isMacroID()/* Don't warn in macros. */) {
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00008970 DiagnoseLogicalAndInLogicalOrLHS(Self, OpLoc, lhs, rhs);
8971 DiagnoseLogicalAndInLogicalOrRHS(Self, OpLoc, lhs, rhs);
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00008972 }
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00008973}
8974
Reid Spencer5f016e22007-07-11 17:01:13 +00008975// Binary Operators. 'Tok' is the token for the operator.
John McCall60d7b3a2010-08-24 06:29:42 +00008976ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc,
John McCall2de56d12010-08-25 11:45:40 +00008977 tok::TokenKind Kind,
8978 Expr *lhs, Expr *rhs) {
8979 BinaryOperatorKind Opc = ConvertTokenKindToBinaryOpcode(Kind);
Steve Narofff69936d2007-09-16 03:34:24 +00008980 assert((lhs != 0) && "ActOnBinOp(): missing left expression");
8981 assert((rhs != 0) && "ActOnBinOp(): missing right expression");
Reid Spencer5f016e22007-07-11 17:01:13 +00008982
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00008983 // Emit warnings for tricky precedence issues, e.g. "bitfield & 0x4 == 0"
8984 DiagnoseBinOpPrecedence(*this, Opc, TokLoc, lhs, rhs);
8985
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00008986 return BuildBinOp(S, TokLoc, Opc, lhs, rhs);
8987}
8988
John McCall60d7b3a2010-08-24 06:29:42 +00008989ExprResult Sema::BuildBinOp(Scope *S, SourceLocation OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00008990 BinaryOperatorKind Opc,
8991 Expr *lhs, Expr *rhs) {
John McCall01b2e4e2010-12-06 05:26:58 +00008992 if (getLangOptions().CPlusPlus) {
8993 bool UseBuiltinOperator;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008994
John McCall01b2e4e2010-12-06 05:26:58 +00008995 if (lhs->isTypeDependent() || rhs->isTypeDependent()) {
8996 UseBuiltinOperator = false;
8997 } else if (Opc == BO_Assign && lhs->getObjectKind() == OK_ObjCProperty) {
8998 UseBuiltinOperator = true;
8999 } else {
9000 UseBuiltinOperator = !lhs->getType()->isOverloadableType() &&
9001 !rhs->getType()->isOverloadableType();
9002 }
9003
9004 if (!UseBuiltinOperator) {
9005 // Find all of the overloaded operators visible from this
9006 // point. We perform both an operator-name lookup from the local
9007 // scope and an argument-dependent lookup based on the types of
9008 // the arguments.
9009 UnresolvedSet<16> Functions;
9010 OverloadedOperatorKind OverOp
9011 = BinaryOperator::getOverloadedOperator(Opc);
9012 if (S && OverOp != OO_None)
9013 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(),
9014 Functions);
9015
9016 // Build the (potentially-overloaded, potentially-dependent)
9017 // binary operation.
9018 return CreateOverloadedBinOp(OpLoc, Opc, Functions, lhs, rhs);
9019 }
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00009020 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009021
Douglas Gregoreaebc752008-11-06 23:29:22 +00009022 // Build a built-in binary operation.
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00009023 return CreateBuiltinBinOp(OpLoc, Opc, lhs, rhs);
Reid Spencer5f016e22007-07-11 17:01:13 +00009024}
9025
John McCall60d7b3a2010-08-24 06:29:42 +00009026ExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc,
Argyrios Kyrtzidisb1fa3dc2011-01-05 20:09:36 +00009027 UnaryOperatorKind Opc,
John Wiegley429bb272011-04-08 18:41:53 +00009028 Expr *InputExpr) {
9029 ExprResult Input = Owned(InputExpr);
John McCallf89e55a2010-11-18 06:31:45 +00009030 ExprValueKind VK = VK_RValue;
9031 ExprObjectKind OK = OK_Ordinary;
Reid Spencer5f016e22007-07-11 17:01:13 +00009032 QualType resultType;
9033 switch (Opc) {
John McCall2de56d12010-08-25 11:45:40 +00009034 case UO_PreInc:
9035 case UO_PreDec:
9036 case UO_PostInc:
9037 case UO_PostDec:
John Wiegley429bb272011-04-08 18:41:53 +00009038 resultType = CheckIncrementDecrementOperand(*this, Input.get(), VK, OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00009039 Opc == UO_PreInc ||
9040 Opc == UO_PostInc,
9041 Opc == UO_PreInc ||
9042 Opc == UO_PreDec);
Reid Spencer5f016e22007-07-11 17:01:13 +00009043 break;
John McCall2de56d12010-08-25 11:45:40 +00009044 case UO_AddrOf:
John Wiegley429bb272011-04-08 18:41:53 +00009045 resultType = CheckAddressOfOperand(*this, Input.get(), OpLoc);
Reid Spencer5f016e22007-07-11 17:01:13 +00009046 break;
John McCall1de4d4e2011-04-07 08:22:57 +00009047 case UO_Deref: {
John McCallfb8721c2011-04-10 19:13:55 +00009048 ExprResult resolved = CheckPlaceholderExpr(Input.get());
John McCall1de4d4e2011-04-07 08:22:57 +00009049 if (!resolved.isUsable()) return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00009050 Input = move(resolved);
9051 Input = DefaultFunctionArrayLvalueConversion(Input.take());
9052 resultType = CheckIndirectionOperand(*this, Input.get(), VK, OpLoc);
Reid Spencer5f016e22007-07-11 17:01:13 +00009053 break;
John McCall1de4d4e2011-04-07 08:22:57 +00009054 }
John McCall2de56d12010-08-25 11:45:40 +00009055 case UO_Plus:
9056 case UO_Minus:
John Wiegley429bb272011-04-08 18:41:53 +00009057 Input = UsualUnaryConversions(Input.take());
9058 if (Input.isInvalid()) return ExprError();
9059 resultType = Input.get()->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00009060 if (resultType->isDependentType())
9061 break;
Douglas Gregor00619622010-06-22 23:41:02 +00009062 if (resultType->isArithmeticType() || // C99 6.5.3.3p1
9063 resultType->isVectorType())
Douglas Gregor74253732008-11-19 15:42:04 +00009064 break;
9065 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7
9066 resultType->isEnumeralType())
9067 break;
9068 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6
John McCall2de56d12010-08-25 11:45:40 +00009069 Opc == UO_Plus &&
Douglas Gregor74253732008-11-19 15:42:04 +00009070 resultType->isPointerType())
9071 break;
John McCall2cd11fe2010-10-12 02:09:17 +00009072 else if (resultType->isPlaceholderType()) {
John McCallfb8721c2011-04-10 19:13:55 +00009073 Input = CheckPlaceholderExpr(Input.take());
John Wiegley429bb272011-04-08 18:41:53 +00009074 if (Input.isInvalid()) return ExprError();
9075 return CreateBuiltinUnaryOp(OpLoc, Opc, Input.take());
John McCall2cd11fe2010-10-12 02:09:17 +00009076 }
Douglas Gregor74253732008-11-19 15:42:04 +00009077
Sebastian Redl0eb23302009-01-19 00:08:26 +00009078 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
John Wiegley429bb272011-04-08 18:41:53 +00009079 << resultType << Input.get()->getSourceRange());
9080
John McCall2de56d12010-08-25 11:45:40 +00009081 case UO_Not: // bitwise complement
John Wiegley429bb272011-04-08 18:41:53 +00009082 Input = UsualUnaryConversions(Input.take());
9083 if (Input.isInvalid()) return ExprError();
9084 resultType = Input.get()->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00009085 if (resultType->isDependentType())
9086 break;
Chris Lattner02a65142008-07-25 23:52:49 +00009087 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension.
9088 if (resultType->isComplexType() || resultType->isComplexIntegerType())
9089 // C99 does not support '~' for complex conjugation.
Chris Lattnerd3a94e22008-11-20 06:06:08 +00009090 Diag(OpLoc, diag::ext_integer_complement_complex)
John Wiegley429bb272011-04-08 18:41:53 +00009091 << resultType << Input.get()->getSourceRange();
John McCall2cd11fe2010-10-12 02:09:17 +00009092 else if (resultType->hasIntegerRepresentation())
9093 break;
9094 else if (resultType->isPlaceholderType()) {
John McCallfb8721c2011-04-10 19:13:55 +00009095 Input = CheckPlaceholderExpr(Input.take());
John Wiegley429bb272011-04-08 18:41:53 +00009096 if (Input.isInvalid()) return ExprError();
9097 return CreateBuiltinUnaryOp(OpLoc, Opc, Input.take());
John McCall2cd11fe2010-10-12 02:09:17 +00009098 } else {
Sebastian Redl0eb23302009-01-19 00:08:26 +00009099 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
John Wiegley429bb272011-04-08 18:41:53 +00009100 << resultType << Input.get()->getSourceRange());
John McCall2cd11fe2010-10-12 02:09:17 +00009101 }
Reid Spencer5f016e22007-07-11 17:01:13 +00009102 break;
John Wiegley429bb272011-04-08 18:41:53 +00009103
John McCall2de56d12010-08-25 11:45:40 +00009104 case UO_LNot: // logical negation
Reid Spencer5f016e22007-07-11 17:01:13 +00009105 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5).
John Wiegley429bb272011-04-08 18:41:53 +00009106 Input = DefaultFunctionArrayLvalueConversion(Input.take());
9107 if (Input.isInvalid()) return ExprError();
9108 resultType = Input.get()->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00009109 if (resultType->isDependentType())
9110 break;
Abramo Bagnara737d5442011-04-07 09:26:19 +00009111 if (resultType->isScalarType()) {
9112 // C99 6.5.3.3p1: ok, fallthrough;
9113 if (Context.getLangOptions().CPlusPlus) {
9114 // C++03 [expr.unary.op]p8, C++0x [expr.unary.op]p9:
9115 // operand contextually converted to bool.
John Wiegley429bb272011-04-08 18:41:53 +00009116 Input = ImpCastExprToType(Input.take(), Context.BoolTy,
9117 ScalarTypeToBooleanCastKind(resultType));
Abramo Bagnara737d5442011-04-07 09:26:19 +00009118 }
John McCall2cd11fe2010-10-12 02:09:17 +00009119 } else if (resultType->isPlaceholderType()) {
John McCallfb8721c2011-04-10 19:13:55 +00009120 Input = CheckPlaceholderExpr(Input.take());
John Wiegley429bb272011-04-08 18:41:53 +00009121 if (Input.isInvalid()) return ExprError();
9122 return CreateBuiltinUnaryOp(OpLoc, Opc, Input.take());
John McCall2cd11fe2010-10-12 02:09:17 +00009123 } else {
Sebastian Redl0eb23302009-01-19 00:08:26 +00009124 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
John Wiegley429bb272011-04-08 18:41:53 +00009125 << resultType << Input.get()->getSourceRange());
John McCall2cd11fe2010-10-12 02:09:17 +00009126 }
Douglas Gregorea844f32010-09-20 17:13:33 +00009127
Reid Spencer5f016e22007-07-11 17:01:13 +00009128 // LNot always has type int. C99 6.5.3.3p5.
Sebastian Redl0eb23302009-01-19 00:08:26 +00009129 // In C++, it's bool. C++ 5.3.1p8
Argyrios Kyrtzidis16f744b2011-02-18 20:55:15 +00009130 resultType = Context.getLogicalOperationType();
Reid Spencer5f016e22007-07-11 17:01:13 +00009131 break;
John McCall2de56d12010-08-25 11:45:40 +00009132 case UO_Real:
9133 case UO_Imag:
John McCall09431682010-11-18 19:01:18 +00009134 resultType = CheckRealImagOperand(*this, Input, OpLoc, Opc == UO_Real);
John McCallf89e55a2010-11-18 06:31:45 +00009135 // _Real and _Imag map ordinary l-values into ordinary l-values.
John Wiegley429bb272011-04-08 18:41:53 +00009136 if (Input.isInvalid()) return ExprError();
9137 if (Input.get()->getValueKind() != VK_RValue &&
9138 Input.get()->getObjectKind() == OK_Ordinary)
9139 VK = Input.get()->getValueKind();
Chris Lattnerdbb36972007-08-24 21:16:53 +00009140 break;
John McCall2de56d12010-08-25 11:45:40 +00009141 case UO_Extension:
John Wiegley429bb272011-04-08 18:41:53 +00009142 resultType = Input.get()->getType();
9143 VK = Input.get()->getValueKind();
9144 OK = Input.get()->getObjectKind();
Reid Spencer5f016e22007-07-11 17:01:13 +00009145 break;
9146 }
John Wiegley429bb272011-04-08 18:41:53 +00009147 if (resultType.isNull() || Input.isInvalid())
Sebastian Redl0eb23302009-01-19 00:08:26 +00009148 return ExprError();
Douglas Gregorbc736fc2009-03-13 23:49:33 +00009149
John Wiegley429bb272011-04-08 18:41:53 +00009150 return Owned(new (Context) UnaryOperator(Input.take(), Opc, resultType,
John McCallf89e55a2010-11-18 06:31:45 +00009151 VK, OK, OpLoc));
Reid Spencer5f016e22007-07-11 17:01:13 +00009152}
9153
John McCall60d7b3a2010-08-24 06:29:42 +00009154ExprResult Sema::BuildUnaryOp(Scope *S, SourceLocation OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00009155 UnaryOperatorKind Opc,
9156 Expr *Input) {
Anders Carlssona8a1e3d2009-11-14 21:26:41 +00009157 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType() &&
Eli Friedman957c0942010-09-05 23:15:52 +00009158 UnaryOperator::getOverloadedOperator(Opc) != OO_None) {
Douglas Gregorbc736fc2009-03-13 23:49:33 +00009159 // Find all of the overloaded operators visible from this
9160 // point. We perform both an operator-name lookup from the local
9161 // scope and an argument-dependent lookup based on the types of
9162 // the arguments.
John McCall6e266892010-01-26 03:27:55 +00009163 UnresolvedSet<16> Functions;
Douglas Gregorbc736fc2009-03-13 23:49:33 +00009164 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc);
John McCall6e266892010-01-26 03:27:55 +00009165 if (S && OverOp != OO_None)
9166 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(),
9167 Functions);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009168
John McCall9ae2f072010-08-23 23:25:46 +00009169 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, Input);
Douglas Gregorbc736fc2009-03-13 23:49:33 +00009170 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009171
John McCall9ae2f072010-08-23 23:25:46 +00009172 return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
Douglas Gregorbc736fc2009-03-13 23:49:33 +00009173}
9174
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00009175// Unary Operators. 'Tok' is the token for the operator.
John McCall60d7b3a2010-08-24 06:29:42 +00009176ExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc,
John McCallf4c73712011-01-19 06:33:43 +00009177 tok::TokenKind Op, Expr *Input) {
John McCall9ae2f072010-08-23 23:25:46 +00009178 return BuildUnaryOp(S, OpLoc, ConvertTokenKindToUnaryOpcode(Op), Input);
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00009179}
9180
Steve Naroff1b273c42007-09-16 14:56:35 +00009181/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo".
Chris Lattnerad8dcf42011-02-17 07:39:24 +00009182ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, SourceLocation LabLoc,
Chris Lattner57ad3782011-02-17 20:34:02 +00009183 LabelDecl *TheDecl) {
Chris Lattnerad8dcf42011-02-17 07:39:24 +00009184 TheDecl->setUsed();
Reid Spencer5f016e22007-07-11 17:01:13 +00009185 // Create the AST node. The address of a label always has type 'void*'.
Chris Lattnerad8dcf42011-02-17 07:39:24 +00009186 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, TheDecl,
Sebastian Redlf53597f2009-03-15 17:47:39 +00009187 Context.getPointerType(Context.VoidTy)));
Reid Spencer5f016e22007-07-11 17:01:13 +00009188}
9189
John McCall60d7b3a2010-08-24 06:29:42 +00009190ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00009191Sema::ActOnStmtExpr(SourceLocation LPLoc, Stmt *SubStmt,
Sebastian Redlf53597f2009-03-15 17:47:39 +00009192 SourceLocation RPLoc) { // "({..})"
Chris Lattnerab18c4c2007-07-24 16:58:17 +00009193 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!");
9194 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt);
9195
Douglas Gregordd8f5692010-03-10 04:54:39 +00009196 bool isFileScope
9197 = (getCurFunctionOrMethodDecl() == 0) && (getCurBlock() == 0);
Chris Lattner4a049f02009-04-25 19:11:05 +00009198 if (isFileScope)
Sebastian Redlf53597f2009-03-15 17:47:39 +00009199 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope));
Eli Friedmandca2b732009-01-24 23:09:00 +00009200
Chris Lattnerab18c4c2007-07-24 16:58:17 +00009201 // FIXME: there are a variety of strange constraints to enforce here, for
9202 // example, it is not possible to goto into a stmt expression apparently.
9203 // More semantic analysis is needed.
Mike Stumpeed9cac2009-02-19 03:04:26 +00009204
Chris Lattnerab18c4c2007-07-24 16:58:17 +00009205 // If there are sub stmts in the compound stmt, take the type of the last one
9206 // as the type of the stmtexpr.
9207 QualType Ty = Context.VoidTy;
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009208 bool StmtExprMayBindToTemp = false;
Chris Lattner611b2ec2008-07-26 19:51:01 +00009209 if (!Compound->body_empty()) {
9210 Stmt *LastStmt = Compound->body_back();
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009211 LabelStmt *LastLabelStmt = 0;
Chris Lattner611b2ec2008-07-26 19:51:01 +00009212 // If LastStmt is a label, skip down through into the body.
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009213 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) {
9214 LastLabelStmt = Label;
Chris Lattner611b2ec2008-07-26 19:51:01 +00009215 LastStmt = Label->getSubStmt();
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009216 }
John Wiegley429bb272011-04-08 18:41:53 +00009217 if (Expr *LastE = dyn_cast<Expr>(LastStmt)) {
John McCallf6a16482010-12-04 03:47:34 +00009218 // Do function/array conversion on the last expression, but not
9219 // lvalue-to-rvalue. However, initialize an unqualified type.
John Wiegley429bb272011-04-08 18:41:53 +00009220 ExprResult LastExpr = DefaultFunctionArrayConversion(LastE);
9221 if (LastExpr.isInvalid())
9222 return ExprError();
9223 Ty = LastExpr.get()->getType().getUnqualifiedType();
John McCallf6a16482010-12-04 03:47:34 +00009224
John Wiegley429bb272011-04-08 18:41:53 +00009225 if (!Ty->isDependentType() && !LastExpr.get()->isTypeDependent()) {
9226 LastExpr = PerformCopyInitialization(
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009227 InitializedEntity::InitializeResult(LPLoc,
9228 Ty,
9229 false),
9230 SourceLocation(),
John Wiegley429bb272011-04-08 18:41:53 +00009231 LastExpr);
9232 if (LastExpr.isInvalid())
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009233 return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00009234 if (LastExpr.get() != 0) {
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009235 if (!LastLabelStmt)
John Wiegley429bb272011-04-08 18:41:53 +00009236 Compound->setLastStmt(LastExpr.take());
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009237 else
John Wiegley429bb272011-04-08 18:41:53 +00009238 LastLabelStmt->setSubStmt(LastExpr.take());
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009239 StmtExprMayBindToTemp = true;
9240 }
9241 }
9242 }
Chris Lattner611b2ec2008-07-26 19:51:01 +00009243 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00009244
Eli Friedmanb1d796d2009-03-23 00:24:07 +00009245 // FIXME: Check that expression type is complete/non-abstract; statement
9246 // expressions are not lvalues.
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00009247 Expr *ResStmtExpr = new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc);
9248 if (StmtExprMayBindToTemp)
9249 return MaybeBindToTemporary(ResStmtExpr);
9250 return Owned(ResStmtExpr);
Chris Lattnerab18c4c2007-07-24 16:58:17 +00009251}
Steve Naroffd34e9152007-08-01 22:05:33 +00009252
John McCall60d7b3a2010-08-24 06:29:42 +00009253ExprResult Sema::BuildBuiltinOffsetOf(SourceLocation BuiltinLoc,
John McCall2cd11fe2010-10-12 02:09:17 +00009254 TypeSourceInfo *TInfo,
9255 OffsetOfComponent *CompPtr,
9256 unsigned NumComponents,
9257 SourceLocation RParenLoc) {
Douglas Gregor8ecdb652010-04-28 22:16:22 +00009258 QualType ArgTy = TInfo->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00009259 bool Dependent = ArgTy->isDependentType();
Abramo Bagnarabd054db2010-05-20 10:00:11 +00009260 SourceRange TypeRange = TInfo->getTypeLoc().getLocalSourceRange();
Douglas Gregor8ecdb652010-04-28 22:16:22 +00009261
Chris Lattner73d0d4f2007-08-30 17:45:32 +00009262 // We must have at least one component that refers to the type, and the first
9263 // one is known to be a field designator. Verify that the ArgTy represents
9264 // a struct/union/class.
Sebastian Redl28507842009-02-26 14:39:58 +00009265 if (!Dependent && !ArgTy->isRecordType())
Douglas Gregor8ecdb652010-04-28 22:16:22 +00009266 return ExprError(Diag(BuiltinLoc, diag::err_offsetof_record_type)
9267 << ArgTy << TypeRange);
9268
9269 // Type must be complete per C99 7.17p3 because a declaring a variable
9270 // with an incomplete type would be ill-formed.
9271 if (!Dependent
9272 && RequireCompleteType(BuiltinLoc, ArgTy,
9273 PDiag(diag::err_offsetof_incomplete_type)
9274 << TypeRange))
9275 return ExprError();
9276
Chris Lattner9e2b75c2007-08-31 21:49:13 +00009277 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a
9278 // GCC extension, diagnose them.
Eli Friedman35183ac2009-02-27 06:44:11 +00009279 // FIXME: This diagnostic isn't actually visible because the location is in
9280 // a system header!
Chris Lattner9e2b75c2007-08-31 21:49:13 +00009281 if (NumComponents != 1)
Chris Lattnerdcd5ef12008-11-19 05:27:50 +00009282 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator)
9283 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd);
Douglas Gregor8ecdb652010-04-28 22:16:22 +00009284
9285 bool DidWarnAboutNonPOD = false;
9286 QualType CurrentType = ArgTy;
9287 typedef OffsetOfExpr::OffsetOfNode OffsetOfNode;
9288 llvm::SmallVector<OffsetOfNode, 4> Comps;
9289 llvm::SmallVector<Expr*, 4> Exprs;
9290 for (unsigned i = 0; i != NumComponents; ++i) {
9291 const OffsetOfComponent &OC = CompPtr[i];
9292 if (OC.isBrackets) {
9293 // Offset of an array sub-field. TODO: Should we allow vector elements?
9294 if (!CurrentType->isDependentType()) {
9295 const ArrayType *AT = Context.getAsArrayType(CurrentType);
9296 if(!AT)
9297 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type)
9298 << CurrentType);
9299 CurrentType = AT->getElementType();
9300 } else
9301 CurrentType = Context.DependentTy;
9302
9303 // The expression must be an integral expression.
9304 // FIXME: An integral constant expression?
9305 Expr *Idx = static_cast<Expr*>(OC.U.E);
9306 if (!Idx->isTypeDependent() && !Idx->isValueDependent() &&
9307 !Idx->getType()->isIntegerType())
9308 return ExprError(Diag(Idx->getLocStart(),
9309 diag::err_typecheck_subscript_not_integer)
9310 << Idx->getSourceRange());
9311
9312 // Record this array index.
9313 Comps.push_back(OffsetOfNode(OC.LocStart, Exprs.size(), OC.LocEnd));
9314 Exprs.push_back(Idx);
9315 continue;
9316 }
9317
9318 // Offset of a field.
9319 if (CurrentType->isDependentType()) {
9320 // We have the offset of a field, but we can't look into the dependent
9321 // type. Just record the identifier of the field.
9322 Comps.push_back(OffsetOfNode(OC.LocStart, OC.U.IdentInfo, OC.LocEnd));
9323 CurrentType = Context.DependentTy;
9324 continue;
9325 }
9326
9327 // We need to have a complete type to look into.
9328 if (RequireCompleteType(OC.LocStart, CurrentType,
9329 diag::err_offsetof_incomplete_type))
9330 return ExprError();
9331
9332 // Look for the designated field.
9333 const RecordType *RC = CurrentType->getAs<RecordType>();
9334 if (!RC)
9335 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type)
9336 << CurrentType);
9337 RecordDecl *RD = RC->getDecl();
9338
9339 // C++ [lib.support.types]p5:
9340 // The macro offsetof accepts a restricted set of type arguments in this
9341 // International Standard. type shall be a POD structure or a POD union
9342 // (clause 9).
9343 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
9344 if (!CRD->isPOD() && !DidWarnAboutNonPOD &&
Ted Kremenek762696f2011-02-23 01:51:43 +00009345 DiagRuntimeBehavior(BuiltinLoc, 0,
Douglas Gregor8ecdb652010-04-28 22:16:22 +00009346 PDiag(diag::warn_offsetof_non_pod_type)
9347 << SourceRange(CompPtr[0].LocStart, OC.LocEnd)
9348 << CurrentType))
9349 DidWarnAboutNonPOD = true;
9350 }
9351
9352 // Look for the field.
9353 LookupResult R(*this, OC.U.IdentInfo, OC.LocStart, LookupMemberName);
9354 LookupQualifiedName(R, RD);
9355 FieldDecl *MemberDecl = R.getAsSingle<FieldDecl>();
Francois Pichet87c2e122010-11-21 06:08:52 +00009356 IndirectFieldDecl *IndirectMemberDecl = 0;
9357 if (!MemberDecl) {
Benjamin Kramerd9811462010-11-21 14:11:41 +00009358 if ((IndirectMemberDecl = R.getAsSingle<IndirectFieldDecl>()))
Francois Pichet87c2e122010-11-21 06:08:52 +00009359 MemberDecl = IndirectMemberDecl->getAnonField();
9360 }
9361
Douglas Gregor8ecdb652010-04-28 22:16:22 +00009362 if (!MemberDecl)
9363 return ExprError(Diag(BuiltinLoc, diag::err_no_member)
9364 << OC.U.IdentInfo << RD << SourceRange(OC.LocStart,
9365 OC.LocEnd));
9366
Douglas Gregor9d5d60f2010-04-28 22:36:06 +00009367 // C99 7.17p3:
9368 // (If the specified member is a bit-field, the behavior is undefined.)
9369 //
9370 // We diagnose this as an error.
9371 if (MemberDecl->getBitWidth()) {
9372 Diag(OC.LocEnd, diag::err_offsetof_bitfield)
9373 << MemberDecl->getDeclName()
9374 << SourceRange(BuiltinLoc, RParenLoc);
9375 Diag(MemberDecl->getLocation(), diag::note_bitfield_decl);
9376 return ExprError();
9377 }
Eli Friedman19410a72010-08-05 10:11:36 +00009378
9379 RecordDecl *Parent = MemberDecl->getParent();
Francois Pichet87c2e122010-11-21 06:08:52 +00009380 if (IndirectMemberDecl)
9381 Parent = cast<RecordDecl>(IndirectMemberDecl->getDeclContext());
Eli Friedman19410a72010-08-05 10:11:36 +00009382
Douglas Gregorcc8a5d52010-04-29 00:18:15 +00009383 // If the member was found in a base class, introduce OffsetOfNodes for
9384 // the base class indirections.
9385 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
9386 /*DetectVirtual=*/false);
Eli Friedman19410a72010-08-05 10:11:36 +00009387 if (IsDerivedFrom(CurrentType, Context.getTypeDeclType(Parent), Paths)) {
Douglas Gregorcc8a5d52010-04-29 00:18:15 +00009388 CXXBasePath &Path = Paths.front();
9389 for (CXXBasePath::iterator B = Path.begin(), BEnd = Path.end();
9390 B != BEnd; ++B)
9391 Comps.push_back(OffsetOfNode(B->Base));
9392 }
Eli Friedman19410a72010-08-05 10:11:36 +00009393
Francois Pichet87c2e122010-11-21 06:08:52 +00009394 if (IndirectMemberDecl) {
9395 for (IndirectFieldDecl::chain_iterator FI =
9396 IndirectMemberDecl->chain_begin(),
9397 FEnd = IndirectMemberDecl->chain_end(); FI != FEnd; FI++) {
9398 assert(isa<FieldDecl>(*FI));
9399 Comps.push_back(OffsetOfNode(OC.LocStart,
9400 cast<FieldDecl>(*FI), OC.LocEnd));
9401 }
9402 } else
Douglas Gregor8ecdb652010-04-28 22:16:22 +00009403 Comps.push_back(OffsetOfNode(OC.LocStart, MemberDecl, OC.LocEnd));
Francois Pichet87c2e122010-11-21 06:08:52 +00009404
Douglas Gregor8ecdb652010-04-28 22:16:22 +00009405 CurrentType = MemberDecl->getType().getNonReferenceType();
9406 }
9407
9408 return Owned(OffsetOfExpr::Create(Context, Context.getSizeType(), BuiltinLoc,
9409 TInfo, Comps.data(), Comps.size(),
9410 Exprs.data(), Exprs.size(), RParenLoc));
9411}
Mike Stumpeed9cac2009-02-19 03:04:26 +00009412
John McCall60d7b3a2010-08-24 06:29:42 +00009413ExprResult Sema::ActOnBuiltinOffsetOf(Scope *S,
John McCall2cd11fe2010-10-12 02:09:17 +00009414 SourceLocation BuiltinLoc,
9415 SourceLocation TypeLoc,
9416 ParsedType argty,
9417 OffsetOfComponent *CompPtr,
9418 unsigned NumComponents,
9419 SourceLocation RPLoc) {
9420
Douglas Gregor8ecdb652010-04-28 22:16:22 +00009421 TypeSourceInfo *ArgTInfo;
9422 QualType ArgTy = GetTypeFromParser(argty, &ArgTInfo);
9423 if (ArgTy.isNull())
9424 return ExprError();
9425
Eli Friedman5a15dc12010-08-05 10:15:45 +00009426 if (!ArgTInfo)
9427 ArgTInfo = Context.getTrivialTypeSourceInfo(ArgTy, TypeLoc);
9428
9429 return BuildBuiltinOffsetOf(BuiltinLoc, ArgTInfo, CompPtr, NumComponents,
9430 RPLoc);
Chris Lattner73d0d4f2007-08-30 17:45:32 +00009431}
9432
9433
John McCall60d7b3a2010-08-24 06:29:42 +00009434ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc,
John McCall2cd11fe2010-10-12 02:09:17 +00009435 Expr *CondExpr,
9436 Expr *LHSExpr, Expr *RHSExpr,
9437 SourceLocation RPLoc) {
Steve Naroffd04fdd52007-08-03 21:21:27 +00009438 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)");
9439
John McCallf89e55a2010-11-18 06:31:45 +00009440 ExprValueKind VK = VK_RValue;
9441 ExprObjectKind OK = OK_Ordinary;
Sebastian Redl28507842009-02-26 14:39:58 +00009442 QualType resType;
Douglas Gregorce940492009-09-25 04:25:58 +00009443 bool ValueDependent = false;
Douglas Gregorc9ecc572009-05-19 22:43:30 +00009444 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) {
Sebastian Redl28507842009-02-26 14:39:58 +00009445 resType = Context.DependentTy;
Douglas Gregorce940492009-09-25 04:25:58 +00009446 ValueDependent = true;
Sebastian Redl28507842009-02-26 14:39:58 +00009447 } else {
9448 // The conditional expression is required to be a constant expression.
9449 llvm::APSInt condEval(32);
9450 SourceLocation ExpLoc;
9451 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc))
Sebastian Redlf53597f2009-03-15 17:47:39 +00009452 return ExprError(Diag(ExpLoc,
9453 diag::err_typecheck_choose_expr_requires_constant)
9454 << CondExpr->getSourceRange());
Steve Naroffd04fdd52007-08-03 21:21:27 +00009455
Sebastian Redl28507842009-02-26 14:39:58 +00009456 // If the condition is > zero, then the AST type is the same as the LSHExpr.
John McCallf89e55a2010-11-18 06:31:45 +00009457 Expr *ActiveExpr = condEval.getZExtValue() ? LHSExpr : RHSExpr;
9458
9459 resType = ActiveExpr->getType();
9460 ValueDependent = ActiveExpr->isValueDependent();
9461 VK = ActiveExpr->getValueKind();
9462 OK = ActiveExpr->getObjectKind();
Sebastian Redl28507842009-02-26 14:39:58 +00009463 }
9464
Sebastian Redlf53597f2009-03-15 17:47:39 +00009465 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr,
John McCallf89e55a2010-11-18 06:31:45 +00009466 resType, VK, OK, RPLoc,
Douglas Gregorce940492009-09-25 04:25:58 +00009467 resType->isDependentType(),
9468 ValueDependent));
Steve Naroffd04fdd52007-08-03 21:21:27 +00009469}
9470
Steve Naroff4eb206b2008-09-03 18:15:37 +00009471//===----------------------------------------------------------------------===//
9472// Clang Extensions.
9473//===----------------------------------------------------------------------===//
9474
9475/// ActOnBlockStart - This callback is invoked when a block literal is started.
Steve Naroff090276f2008-10-10 01:28:17 +00009476void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) {
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00009477 BlockDecl *Block = BlockDecl::Create(Context, CurContext, CaretLoc);
9478 PushBlockScope(BlockScope, Block);
9479 CurContext->addDecl(Block);
Fariborz Jahaniana729da22010-07-09 18:44:02 +00009480 if (BlockScope)
9481 PushDeclContext(BlockScope, Block);
9482 else
9483 CurContext = Block;
Steve Naroff090276f2008-10-10 01:28:17 +00009484}
9485
Mike Stump98eb8a72009-02-04 22:31:32 +00009486void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) {
Mike Stumpaf199f32009-05-07 18:43:07 +00009487 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!");
John McCall711c52b2011-01-05 12:14:39 +00009488 assert(ParamInfo.getContext() == Declarator::BlockLiteralContext);
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00009489 BlockScopeInfo *CurBlock = getCurBlock();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009490
John McCallbf1a0282010-06-04 23:28:52 +00009491 TypeSourceInfo *Sig = GetTypeForDeclarator(ParamInfo, CurScope);
John McCallbf1a0282010-06-04 23:28:52 +00009492 QualType T = Sig->getType();
Mike Stump98eb8a72009-02-04 22:31:32 +00009493
John McCall711c52b2011-01-05 12:14:39 +00009494 // GetTypeForDeclarator always produces a function type for a block
9495 // literal signature. Furthermore, it is always a FunctionProtoType
9496 // unless the function was written with a typedef.
9497 assert(T->isFunctionType() &&
9498 "GetTypeForDeclarator made a non-function block signature");
9499
9500 // Look for an explicit signature in that function type.
9501 FunctionProtoTypeLoc ExplicitSignature;
9502
9503 TypeLoc tmp = Sig->getTypeLoc().IgnoreParens();
9504 if (isa<FunctionProtoTypeLoc>(tmp)) {
9505 ExplicitSignature = cast<FunctionProtoTypeLoc>(tmp);
9506
9507 // Check whether that explicit signature was synthesized by
9508 // GetTypeForDeclarator. If so, don't save that as part of the
9509 // written signature.
Abramo Bagnara796aa442011-03-12 11:17:06 +00009510 if (ExplicitSignature.getLocalRangeBegin() ==
9511 ExplicitSignature.getLocalRangeEnd()) {
John McCall711c52b2011-01-05 12:14:39 +00009512 // This would be much cheaper if we stored TypeLocs instead of
9513 // TypeSourceInfos.
9514 TypeLoc Result = ExplicitSignature.getResultLoc();
9515 unsigned Size = Result.getFullDataSize();
9516 Sig = Context.CreateTypeSourceInfo(Result.getType(), Size);
9517 Sig->getTypeLoc().initializeFullCopy(Result, Size);
9518
9519 ExplicitSignature = FunctionProtoTypeLoc();
9520 }
John McCall82dc0092010-06-04 11:21:44 +00009521 }
Mike Stump1eb44332009-09-09 15:08:12 +00009522
John McCall711c52b2011-01-05 12:14:39 +00009523 CurBlock->TheDecl->setSignatureAsWritten(Sig);
9524 CurBlock->FunctionType = T;
9525
9526 const FunctionType *Fn = T->getAs<FunctionType>();
9527 QualType RetTy = Fn->getResultType();
9528 bool isVariadic =
9529 (isa<FunctionProtoType>(Fn) && cast<FunctionProtoType>(Fn)->isVariadic());
9530
John McCallc71a4912010-06-04 19:02:56 +00009531 CurBlock->TheDecl->setIsVariadic(isVariadic);
Douglas Gregora873dfc2010-02-03 00:27:59 +00009532
John McCall82dc0092010-06-04 11:21:44 +00009533 // Don't allow returning a objc interface by value.
9534 if (RetTy->isObjCObjectType()) {
9535 Diag(ParamInfo.getSourceRange().getBegin(),
9536 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy;
9537 return;
9538 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00009539
John McCall82dc0092010-06-04 11:21:44 +00009540 // Context.DependentTy is used as a placeholder for a missing block
John McCallc71a4912010-06-04 19:02:56 +00009541 // return type. TODO: what should we do with declarators like:
9542 // ^ * { ... }
9543 // If the answer is "apply template argument deduction"....
John McCall82dc0092010-06-04 11:21:44 +00009544 if (RetTy != Context.DependentTy)
9545 CurBlock->ReturnType = RetTy;
Mike Stumpeed9cac2009-02-19 03:04:26 +00009546
John McCall82dc0092010-06-04 11:21:44 +00009547 // Push block parameters from the declarator if we had them.
John McCallc71a4912010-06-04 19:02:56 +00009548 llvm::SmallVector<ParmVarDecl*, 8> Params;
John McCall711c52b2011-01-05 12:14:39 +00009549 if (ExplicitSignature) {
9550 for (unsigned I = 0, E = ExplicitSignature.getNumArgs(); I != E; ++I) {
9551 ParmVarDecl *Param = ExplicitSignature.getArg(I);
Fariborz Jahanian9a66c302010-02-12 21:53:14 +00009552 if (Param->getIdentifier() == 0 &&
9553 !Param->isImplicit() &&
9554 !Param->isInvalidDecl() &&
9555 !getLangOptions().CPlusPlus)
9556 Diag(Param->getLocation(), diag::err_parameter_name_omitted);
John McCallc71a4912010-06-04 19:02:56 +00009557 Params.push_back(Param);
Fariborz Jahanian9a66c302010-02-12 21:53:14 +00009558 }
John McCall82dc0092010-06-04 11:21:44 +00009559
9560 // Fake up parameter variables if we have a typedef, like
9561 // ^ fntype { ... }
9562 } else if (const FunctionProtoType *Fn = T->getAs<FunctionProtoType>()) {
9563 for (FunctionProtoType::arg_type_iterator
9564 I = Fn->arg_type_begin(), E = Fn->arg_type_end(); I != E; ++I) {
9565 ParmVarDecl *Param =
9566 BuildParmVarDeclForTypedef(CurBlock->TheDecl,
9567 ParamInfo.getSourceRange().getBegin(),
9568 *I);
John McCallc71a4912010-06-04 19:02:56 +00009569 Params.push_back(Param);
John McCall82dc0092010-06-04 11:21:44 +00009570 }
Steve Naroff4eb206b2008-09-03 18:15:37 +00009571 }
John McCall82dc0092010-06-04 11:21:44 +00009572
John McCallc71a4912010-06-04 19:02:56 +00009573 // Set the parameters on the block decl.
Douglas Gregor82aa7132010-11-01 18:37:59 +00009574 if (!Params.empty()) {
John McCallc71a4912010-06-04 19:02:56 +00009575 CurBlock->TheDecl->setParams(Params.data(), Params.size());
Douglas Gregor82aa7132010-11-01 18:37:59 +00009576 CheckParmsForFunctionDef(CurBlock->TheDecl->param_begin(),
9577 CurBlock->TheDecl->param_end(),
9578 /*CheckParameterNames=*/false);
9579 }
9580
John McCall82dc0092010-06-04 11:21:44 +00009581 // Finally we can process decl attributes.
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00009582 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo);
John McCall053f4bd2010-03-22 09:20:08 +00009583
John McCallc71a4912010-06-04 19:02:56 +00009584 if (!isVariadic && CurBlock->TheDecl->getAttr<SentinelAttr>()) {
John McCall82dc0092010-06-04 11:21:44 +00009585 Diag(ParamInfo.getAttributes()->getLoc(),
9586 diag::warn_attribute_sentinel_not_variadic) << 1;
9587 // FIXME: remove the attribute.
9588 }
9589
9590 // Put the parameter variables in scope. We can bail out immediately
9591 // if we don't have any.
John McCallc71a4912010-06-04 19:02:56 +00009592 if (Params.empty())
John McCall82dc0092010-06-04 11:21:44 +00009593 return;
9594
Steve Naroff090276f2008-10-10 01:28:17 +00009595 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(),
John McCall7a9813c2010-01-22 00:28:27 +00009596 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) {
9597 (*AI)->setOwningFunction(CurBlock->TheDecl);
9598
Steve Naroff090276f2008-10-10 01:28:17 +00009599 // If this has an identifier, add it to the scope stack.
John McCall053f4bd2010-03-22 09:20:08 +00009600 if ((*AI)->getIdentifier()) {
Argyrios Kyrtzidis08274082010-12-15 18:44:22 +00009601 CheckShadow(CurBlock->TheScope, *AI);
John McCall053f4bd2010-03-22 09:20:08 +00009602
Steve Naroff090276f2008-10-10 01:28:17 +00009603 PushOnScopeChains(*AI, CurBlock->TheScope);
John McCall053f4bd2010-03-22 09:20:08 +00009604 }
John McCall7a9813c2010-01-22 00:28:27 +00009605 }
Steve Naroff4eb206b2008-09-03 18:15:37 +00009606}
9607
9608/// ActOnBlockError - If there is an error parsing a block, this callback
9609/// is invoked to pop the information about the block from the action impl.
9610void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) {
Steve Naroff4eb206b2008-09-03 18:15:37 +00009611 // Pop off CurBlock, handle nested blocks.
Chris Lattner5c59e2b2009-04-21 22:38:46 +00009612 PopDeclContext();
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00009613 PopFunctionOrBlockScope();
Steve Naroff4eb206b2008-09-03 18:15:37 +00009614}
9615
9616/// ActOnBlockStmtExpr - This is called when the body of a block statement
9617/// literal was successfully completed. ^(int x){...}
John McCall60d7b3a2010-08-24 06:29:42 +00009618ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc,
Chris Lattnere476bdc2011-02-17 23:58:47 +00009619 Stmt *Body, Scope *CurScope) {
Chris Lattner9af55002009-03-27 04:18:06 +00009620 // If blocks are disabled, emit an error.
9621 if (!LangOpts.Blocks)
9622 Diag(CaretLoc, diag::err_blocks_disable);
Mike Stump1eb44332009-09-09 15:08:12 +00009623
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00009624 BlockScopeInfo *BSI = cast<BlockScopeInfo>(FunctionScopes.back());
Fariborz Jahaniana729da22010-07-09 18:44:02 +00009625
Steve Naroff090276f2008-10-10 01:28:17 +00009626 PopDeclContext();
9627
Steve Naroff4eb206b2008-09-03 18:15:37 +00009628 QualType RetTy = Context.VoidTy;
Fariborz Jahanian7d5c74e2009-06-19 23:37:08 +00009629 if (!BSI->ReturnType.isNull())
9630 RetTy = BSI->ReturnType;
Mike Stumpeed9cac2009-02-19 03:04:26 +00009631
Mike Stump56925862009-07-28 22:04:01 +00009632 bool NoReturn = BSI->TheDecl->getAttr<NoReturnAttr>();
Steve Naroff4eb206b2008-09-03 18:15:37 +00009633 QualType BlockTy;
John McCallc71a4912010-06-04 19:02:56 +00009634
John McCall469a1eb2011-02-02 13:00:07 +00009635 // Set the captured variables on the block.
John McCall6b5a61b2011-02-07 10:33:21 +00009636 BSI->TheDecl->setCaptures(Context, BSI->Captures.begin(), BSI->Captures.end(),
9637 BSI->CapturesCXXThis);
John McCall469a1eb2011-02-02 13:00:07 +00009638
John McCallc71a4912010-06-04 19:02:56 +00009639 // If the user wrote a function type in some form, try to use that.
9640 if (!BSI->FunctionType.isNull()) {
9641 const FunctionType *FTy = BSI->FunctionType->getAs<FunctionType>();
9642
9643 FunctionType::ExtInfo Ext = FTy->getExtInfo();
9644 if (NoReturn && !Ext.getNoReturn()) Ext = Ext.withNoReturn(true);
9645
9646 // Turn protoless block types into nullary block types.
9647 if (isa<FunctionNoProtoType>(FTy)) {
John McCalle23cf432010-12-14 08:05:40 +00009648 FunctionProtoType::ExtProtoInfo EPI;
9649 EPI.ExtInfo = Ext;
9650 BlockTy = Context.getFunctionType(RetTy, 0, 0, EPI);
John McCallc71a4912010-06-04 19:02:56 +00009651
9652 // Otherwise, if we don't need to change anything about the function type,
9653 // preserve its sugar structure.
9654 } else if (FTy->getResultType() == RetTy &&
9655 (!NoReturn || FTy->getNoReturnAttr())) {
9656 BlockTy = BSI->FunctionType;
9657
9658 // Otherwise, make the minimal modifications to the function type.
9659 } else {
9660 const FunctionProtoType *FPT = cast<FunctionProtoType>(FTy);
John McCalle23cf432010-12-14 08:05:40 +00009661 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
9662 EPI.TypeQuals = 0; // FIXME: silently?
9663 EPI.ExtInfo = Ext;
John McCallc71a4912010-06-04 19:02:56 +00009664 BlockTy = Context.getFunctionType(RetTy,
9665 FPT->arg_type_begin(),
9666 FPT->getNumArgs(),
John McCalle23cf432010-12-14 08:05:40 +00009667 EPI);
John McCallc71a4912010-06-04 19:02:56 +00009668 }
9669
9670 // If we don't have a function type, just build one from nothing.
9671 } else {
John McCalle23cf432010-12-14 08:05:40 +00009672 FunctionProtoType::ExtProtoInfo EPI;
Eli Friedmana49218e2011-04-09 08:18:08 +00009673 EPI.ExtInfo = FunctionType::ExtInfo(NoReturn, false, 0, CC_Default);
John McCalle23cf432010-12-14 08:05:40 +00009674 BlockTy = Context.getFunctionType(RetTy, 0, 0, EPI);
John McCallc71a4912010-06-04 19:02:56 +00009675 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00009676
John McCallc71a4912010-06-04 19:02:56 +00009677 DiagnoseUnusedParameters(BSI->TheDecl->param_begin(),
9678 BSI->TheDecl->param_end());
Steve Naroff4eb206b2008-09-03 18:15:37 +00009679 BlockTy = Context.getBlockPointerType(BlockTy);
Mike Stumpeed9cac2009-02-19 03:04:26 +00009680
Chris Lattner17a78302009-04-19 05:28:12 +00009681 // If needed, diagnose invalid gotos and switches in the block.
John McCall781472f2010-08-25 08:40:02 +00009682 if (getCurFunction()->NeedsScopeChecking() && !hasAnyErrorsInThisFunction())
John McCall9ae2f072010-08-23 23:25:46 +00009683 DiagnoseInvalidJumps(cast<CompoundStmt>(Body));
Mike Stump1eb44332009-09-09 15:08:12 +00009684
Chris Lattnere476bdc2011-02-17 23:58:47 +00009685 BSI->TheDecl->setBody(cast<CompoundStmt>(Body));
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009686
John McCall469a1eb2011-02-02 13:00:07 +00009687 BlockExpr *Result = new (Context) BlockExpr(BSI->TheDecl, BlockTy);
John McCalle0054f62010-08-25 05:56:39 +00009688
Ted Kremenek3ed6fc02011-02-23 01:51:48 +00009689 const AnalysisBasedWarnings::Policy &WP = AnalysisWarnings.getDefaultPolicy();
9690 PopFunctionOrBlockScope(&WP, Result->getBlockDecl(), Result);
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00009691 return Owned(Result);
Steve Naroff4eb206b2008-09-03 18:15:37 +00009692}
9693
John McCall60d7b3a2010-08-24 06:29:42 +00009694ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc,
John McCallb3d87482010-08-24 05:47:05 +00009695 Expr *expr, ParsedType type,
Sebastian Redlf53597f2009-03-15 17:47:39 +00009696 SourceLocation RPLoc) {
Abramo Bagnara2cad9002010-08-10 10:06:15 +00009697 TypeSourceInfo *TInfo;
Jeffrey Yasskindec09842011-01-18 02:00:16 +00009698 GetTypeFromParser(type, &TInfo);
John McCall9ae2f072010-08-23 23:25:46 +00009699 return BuildVAArgExpr(BuiltinLoc, expr, TInfo, RPLoc);
Abramo Bagnara2cad9002010-08-10 10:06:15 +00009700}
9701
John McCall60d7b3a2010-08-24 06:29:42 +00009702ExprResult Sema::BuildVAArgExpr(SourceLocation BuiltinLoc,
John McCallf89e55a2010-11-18 06:31:45 +00009703 Expr *E, TypeSourceInfo *TInfo,
9704 SourceLocation RPLoc) {
Chris Lattner0d20b8a2009-04-05 15:49:53 +00009705 Expr *OrigExpr = E;
Mike Stump1eb44332009-09-09 15:08:12 +00009706
Eli Friedmanc34bcde2008-08-09 23:32:40 +00009707 // Get the va_list type
9708 QualType VaListType = Context.getBuiltinVaListType();
Eli Friedman5c091ba2009-05-16 12:46:54 +00009709 if (VaListType->isArrayType()) {
9710 // Deal with implicit array decay; for example, on x86-64,
9711 // va_list is an array, but it's supposed to decay to
9712 // a pointer for va_arg.
Eli Friedmanc34bcde2008-08-09 23:32:40 +00009713 VaListType = Context.getArrayDecayedType(VaListType);
Eli Friedman5c091ba2009-05-16 12:46:54 +00009714 // Make sure the input expression also decays appropriately.
John Wiegley429bb272011-04-08 18:41:53 +00009715 ExprResult Result = UsualUnaryConversions(E);
9716 if (Result.isInvalid())
9717 return ExprError();
9718 E = Result.take();
Eli Friedman5c091ba2009-05-16 12:46:54 +00009719 } else {
9720 // Otherwise, the va_list argument must be an l-value because
9721 // it is modified by va_arg.
Mike Stump1eb44332009-09-09 15:08:12 +00009722 if (!E->isTypeDependent() &&
Douglas Gregordd027302009-05-19 23:10:31 +00009723 CheckForModifiableLvalue(E, BuiltinLoc, *this))
Eli Friedman5c091ba2009-05-16 12:46:54 +00009724 return ExprError();
9725 }
Eli Friedmanc34bcde2008-08-09 23:32:40 +00009726
Douglas Gregordd027302009-05-19 23:10:31 +00009727 if (!E->isTypeDependent() &&
9728 !Context.hasSameType(VaListType, E->getType())) {
Sebastian Redlf53597f2009-03-15 17:47:39 +00009729 return ExprError(Diag(E->getLocStart(),
9730 diag::err_first_argument_to_va_arg_not_of_type_va_list)
Chris Lattner0d20b8a2009-04-05 15:49:53 +00009731 << OrigExpr->getType() << E->getSourceRange());
Chris Lattner9dc8f192009-04-05 00:59:53 +00009732 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00009733
Eli Friedmanb1d796d2009-03-23 00:24:07 +00009734 // FIXME: Check that type is complete/non-abstract
Anders Carlsson7c50aca2007-10-15 20:28:48 +00009735 // FIXME: Warn if a non-POD type is passed in.
Mike Stumpeed9cac2009-02-19 03:04:26 +00009736
Abramo Bagnara2cad9002010-08-10 10:06:15 +00009737 QualType T = TInfo->getType().getNonLValueExprType(Context);
9738 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, TInfo, RPLoc, T));
Anders Carlsson7c50aca2007-10-15 20:28:48 +00009739}
9740
John McCall60d7b3a2010-08-24 06:29:42 +00009741ExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) {
Douglas Gregor2d8b2732008-11-29 04:51:27 +00009742 // The type of __null will be int or long, depending on the size of
9743 // pointers on the target.
9744 QualType Ty;
NAKAMURA Takumi6e5658d2011-01-19 00:11:41 +00009745 unsigned pw = Context.Target.getPointerWidth(0);
9746 if (pw == Context.Target.getIntWidth())
Douglas Gregor2d8b2732008-11-29 04:51:27 +00009747 Ty = Context.IntTy;
NAKAMURA Takumi6e5658d2011-01-19 00:11:41 +00009748 else if (pw == Context.Target.getLongWidth())
Douglas Gregor2d8b2732008-11-29 04:51:27 +00009749 Ty = Context.LongTy;
NAKAMURA Takumi6e5658d2011-01-19 00:11:41 +00009750 else if (pw == Context.Target.getLongLongWidth())
9751 Ty = Context.LongLongTy;
9752 else {
9753 assert(!"I don't know size of pointer!");
9754 Ty = Context.IntTy;
9755 }
Douglas Gregor2d8b2732008-11-29 04:51:27 +00009756
Sebastian Redlf53597f2009-03-15 17:47:39 +00009757 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc));
Douglas Gregor2d8b2732008-11-29 04:51:27 +00009758}
9759
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00009760static void MakeObjCStringLiteralFixItHint(Sema& SemaRef, QualType DstType,
Douglas Gregor849b2432010-03-31 17:46:05 +00009761 Expr *SrcExpr, FixItHint &Hint) {
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00009762 if (!SemaRef.getLangOptions().ObjC1)
9763 return;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009764
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00009765 const ObjCObjectPointerType *PT = DstType->getAs<ObjCObjectPointerType>();
9766 if (!PT)
9767 return;
9768
9769 // Check if the destination is of type 'id'.
9770 if (!PT->isObjCIdType()) {
9771 // Check if the destination is the 'NSString' interface.
9772 const ObjCInterfaceDecl *ID = PT->getInterfaceDecl();
9773 if (!ID || !ID->getIdentifier()->isStr("NSString"))
9774 return;
9775 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009776
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00009777 // Strip off any parens and casts.
9778 StringLiteral *SL = dyn_cast<StringLiteral>(SrcExpr->IgnoreParenCasts());
9779 if (!SL || SL->isWide())
9780 return;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009781
Douglas Gregor849b2432010-03-31 17:46:05 +00009782 Hint = FixItHint::CreateInsertion(SL->getLocStart(), "@");
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00009783}
9784
Chris Lattner5cf216b2008-01-04 18:04:52 +00009785bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy,
9786 SourceLocation Loc,
9787 QualType DstType, QualType SrcType,
Douglas Gregora41a8c52010-04-22 00:20:18 +00009788 Expr *SrcExpr, AssignmentAction Action,
9789 bool *Complained) {
9790 if (Complained)
9791 *Complained = false;
9792
Chris Lattner5cf216b2008-01-04 18:04:52 +00009793 // Decode the result (notice that AST's are still created for extensions).
9794 bool isInvalid = false;
9795 unsigned DiagKind;
Douglas Gregor849b2432010-03-31 17:46:05 +00009796 FixItHint Hint;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009797
Chris Lattner5cf216b2008-01-04 18:04:52 +00009798 switch (ConvTy) {
9799 default: assert(0 && "Unknown conversion type");
9800 case Compatible: return false;
Chris Lattnerb7b61152008-01-04 18:22:42 +00009801 case PointerToInt:
Chris Lattner5cf216b2008-01-04 18:04:52 +00009802 DiagKind = diag::ext_typecheck_convert_pointer_int;
9803 break;
Chris Lattnerb7b61152008-01-04 18:22:42 +00009804 case IntToPointer:
9805 DiagKind = diag::ext_typecheck_convert_int_pointer;
9806 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009807 case IncompatiblePointer:
Douglas Gregor849b2432010-03-31 17:46:05 +00009808 MakeObjCStringLiteralFixItHint(*this, DstType, SrcExpr, Hint);
Chris Lattner5cf216b2008-01-04 18:04:52 +00009809 DiagKind = diag::ext_typecheck_convert_incompatible_pointer;
9810 break;
Eli Friedmanf05c05d2009-03-22 23:59:44 +00009811 case IncompatiblePointerSign:
9812 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign;
9813 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009814 case FunctionVoidPointer:
9815 DiagKind = diag::ext_typecheck_convert_pointer_void_func;
9816 break;
John McCall86c05f32011-02-01 00:10:29 +00009817 case IncompatiblePointerDiscardsQualifiers: {
John McCall40249e72011-02-01 23:28:01 +00009818 // Perform array-to-pointer decay if necessary.
9819 if (SrcType->isArrayType()) SrcType = Context.getArrayDecayedType(SrcType);
9820
John McCall86c05f32011-02-01 00:10:29 +00009821 Qualifiers lhq = SrcType->getPointeeType().getQualifiers();
9822 Qualifiers rhq = DstType->getPointeeType().getQualifiers();
9823 if (lhq.getAddressSpace() != rhq.getAddressSpace()) {
9824 DiagKind = diag::err_typecheck_incompatible_address_space;
9825 break;
9826 }
9827
9828 llvm_unreachable("unknown error case for discarding qualifiers!");
9829 // fallthrough
9830 }
Chris Lattner5cf216b2008-01-04 18:04:52 +00009831 case CompatiblePointerDiscardsQualifiers:
Douglas Gregor77a52232008-09-12 00:47:35 +00009832 // If the qualifiers lost were because we were applying the
9833 // (deprecated) C++ conversion from a string literal to a char*
9834 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME:
9835 // Ideally, this check would be performed in
John McCalle4be87e2011-01-31 23:13:11 +00009836 // checkPointerTypesForAssignment. However, that would require a
Douglas Gregor77a52232008-09-12 00:47:35 +00009837 // bit of refactoring (so that the second argument is an
9838 // expression, rather than a type), which should be done as part
John McCalle4be87e2011-01-31 23:13:11 +00009839 // of a larger effort to fix checkPointerTypesForAssignment for
Douglas Gregor77a52232008-09-12 00:47:35 +00009840 // C++ semantics.
9841 if (getLangOptions().CPlusPlus &&
9842 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType))
9843 return false;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009844 DiagKind = diag::ext_typecheck_convert_discards_qualifiers;
9845 break;
Sean Huntc9132b62009-11-08 07:46:34 +00009846 case IncompatibleNestedPointerQualifiers:
Fariborz Jahanian3451e922009-11-09 22:16:37 +00009847 DiagKind = diag::ext_nested_pointer_qualifier_mismatch;
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00009848 break;
Steve Naroff1c7d0672008-09-04 15:10:53 +00009849 case IntToBlockPointer:
9850 DiagKind = diag::err_int_to_block_pointer;
9851 break;
9852 case IncompatibleBlockPointer:
Mike Stump25efa102009-04-21 22:51:42 +00009853 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer;
Steve Naroff1c7d0672008-09-04 15:10:53 +00009854 break;
Steve Naroff39579072008-10-14 22:18:38 +00009855 case IncompatibleObjCQualifiedId:
Mike Stumpeed9cac2009-02-19 03:04:26 +00009856 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since
Steve Naroff39579072008-10-14 22:18:38 +00009857 // it can give a more specific diagnostic.
9858 DiagKind = diag::warn_incompatible_qualified_id;
9859 break;
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00009860 case IncompatibleVectors:
9861 DiagKind = diag::warn_incompatible_vectors;
9862 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009863 case Incompatible:
9864 DiagKind = diag::err_typecheck_convert_incompatible;
9865 isInvalid = true;
9866 break;
9867 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00009868
Douglas Gregord4eea832010-04-09 00:35:39 +00009869 QualType FirstType, SecondType;
9870 switch (Action) {
9871 case AA_Assigning:
9872 case AA_Initializing:
9873 // The destination type comes first.
9874 FirstType = DstType;
9875 SecondType = SrcType;
9876 break;
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00009877
Douglas Gregord4eea832010-04-09 00:35:39 +00009878 case AA_Returning:
9879 case AA_Passing:
9880 case AA_Converting:
9881 case AA_Sending:
9882 case AA_Casting:
9883 // The source type comes first.
9884 FirstType = SrcType;
9885 SecondType = DstType;
9886 break;
9887 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00009888
Douglas Gregord4eea832010-04-09 00:35:39 +00009889 Diag(Loc, DiagKind) << FirstType << SecondType << Action
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00009890 << SrcExpr->getSourceRange() << Hint;
Douglas Gregora41a8c52010-04-22 00:20:18 +00009891 if (Complained)
9892 *Complained = true;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009893 return isInvalid;
9894}
Anders Carlssone21555e2008-11-30 19:50:32 +00009895
Chris Lattner3bf68932009-04-25 21:59:05 +00009896bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){
Eli Friedman3b5ccca2009-04-25 22:26:58 +00009897 llvm::APSInt ICEResult;
9898 if (E->isIntegerConstantExpr(ICEResult, Context)) {
9899 if (Result)
9900 *Result = ICEResult;
9901 return false;
9902 }
9903
Anders Carlssone21555e2008-11-30 19:50:32 +00009904 Expr::EvalResult EvalResult;
9905
Mike Stumpeed9cac2009-02-19 03:04:26 +00009906 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() ||
Anders Carlssone21555e2008-11-30 19:50:32 +00009907 EvalResult.HasSideEffects) {
9908 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange();
9909
9910 if (EvalResult.Diag) {
9911 // We only show the note if it's not the usual "invalid subexpression"
9912 // or if it's actually in a subexpression.
9913 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice ||
9914 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens())
9915 Diag(EvalResult.DiagLoc, EvalResult.Diag);
9916 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00009917
Anders Carlssone21555e2008-11-30 19:50:32 +00009918 return true;
9919 }
9920
Eli Friedman3b5ccca2009-04-25 22:26:58 +00009921 Diag(E->getExprLoc(), diag::ext_expr_not_ice) <<
9922 E->getSourceRange();
Anders Carlssone21555e2008-11-30 19:50:32 +00009923
Eli Friedman3b5ccca2009-04-25 22:26:58 +00009924 if (EvalResult.Diag &&
Argyrios Kyrtzidis08274082010-12-15 18:44:22 +00009925 Diags.getDiagnosticLevel(diag::ext_expr_not_ice, EvalResult.DiagLoc)
9926 != Diagnostic::Ignored)
Eli Friedman3b5ccca2009-04-25 22:26:58 +00009927 Diag(EvalResult.DiagLoc, EvalResult.Diag);
Mike Stumpeed9cac2009-02-19 03:04:26 +00009928
Anders Carlssone21555e2008-11-30 19:50:32 +00009929 if (Result)
9930 *Result = EvalResult.Val.getInt();
9931 return false;
9932}
Douglas Gregore0762c92009-06-19 23:52:42 +00009933
Douglas Gregor2afce722009-11-26 00:44:06 +00009934void
Mike Stump1eb44332009-09-09 15:08:12 +00009935Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext) {
Douglas Gregor2afce722009-11-26 00:44:06 +00009936 ExprEvalContexts.push_back(
9937 ExpressionEvaluationContextRecord(NewContext, ExprTemporaries.size()));
Douglas Gregorac7610d2009-06-22 20:57:11 +00009938}
9939
Mike Stump1eb44332009-09-09 15:08:12 +00009940void
Douglas Gregor2afce722009-11-26 00:44:06 +00009941Sema::PopExpressionEvaluationContext() {
9942 // Pop the current expression evaluation context off the stack.
9943 ExpressionEvaluationContextRecord Rec = ExprEvalContexts.back();
9944 ExprEvalContexts.pop_back();
Douglas Gregorac7610d2009-06-22 20:57:11 +00009945
Douglas Gregor06d33692009-12-12 07:57:52 +00009946 if (Rec.Context == PotentiallyPotentiallyEvaluated) {
9947 if (Rec.PotentiallyReferenced) {
9948 // Mark any remaining declarations in the current position of the stack
9949 // as "referenced". If they were not meant to be referenced, semantic
9950 // analysis would have eliminated them (e.g., in ActOnCXXTypeId).
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009951 for (PotentiallyReferencedDecls::iterator
Douglas Gregor06d33692009-12-12 07:57:52 +00009952 I = Rec.PotentiallyReferenced->begin(),
9953 IEnd = Rec.PotentiallyReferenced->end();
9954 I != IEnd; ++I)
9955 MarkDeclarationReferenced(I->first, I->second);
9956 }
9957
9958 if (Rec.PotentiallyDiagnosed) {
9959 // Emit any pending diagnostics.
9960 for (PotentiallyEmittedDiagnostics::iterator
9961 I = Rec.PotentiallyDiagnosed->begin(),
9962 IEnd = Rec.PotentiallyDiagnosed->end();
9963 I != IEnd; ++I)
9964 Diag(I->first, I->second);
9965 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009966 }
Douglas Gregor2afce722009-11-26 00:44:06 +00009967
9968 // When are coming out of an unevaluated context, clear out any
9969 // temporaries that we may have created as part of the evaluation of
9970 // the expression in that context: they aren't relevant because they
9971 // will never be constructed.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009972 if (Rec.Context == Unevaluated &&
Douglas Gregor2afce722009-11-26 00:44:06 +00009973 ExprTemporaries.size() > Rec.NumTemporaries)
9974 ExprTemporaries.erase(ExprTemporaries.begin() + Rec.NumTemporaries,
9975 ExprTemporaries.end());
9976
9977 // Destroy the popped expression evaluation record.
9978 Rec.Destroy();
Douglas Gregorac7610d2009-06-22 20:57:11 +00009979}
Douglas Gregore0762c92009-06-19 23:52:42 +00009980
9981/// \brief Note that the given declaration was referenced in the source code.
9982///
9983/// This routine should be invoke whenever a given declaration is referenced
9984/// in the source code, and where that reference occurred. If this declaration
9985/// reference means that the the declaration is used (C++ [basic.def.odr]p2,
9986/// C99 6.9p3), then the declaration will be marked as used.
9987///
9988/// \param Loc the location where the declaration was referenced.
9989///
9990/// \param D the declaration that has been referenced by the source code.
9991void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) {
9992 assert(D && "No declaration?");
Mike Stump1eb44332009-09-09 15:08:12 +00009993
Argyrios Kyrtzidis6b6b42a2011-04-19 19:51:10 +00009994 D->setReferenced();
9995
Douglas Gregorc070cc62010-06-17 23:14:26 +00009996 if (D->isUsed(false))
Douglas Gregord7f37bf2009-06-22 23:06:13 +00009997 return;
Mike Stump1eb44332009-09-09 15:08:12 +00009998
Douglas Gregorb5352cf2009-10-08 21:35:42 +00009999 // Mark a parameter or variable declaration "used", regardless of whether we're in a
10000 // template or not. The reason for this is that unevaluated expressions
10001 // (e.g. (void)sizeof()) constitute a use for warning purposes (-Wunused-variables and
10002 // -Wunused-parameters)
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010003 if (isa<ParmVarDecl>(D) ||
Douglas Gregorfc2ca562010-04-07 20:29:57 +000010004 (isa<VarDecl>(D) && D->getDeclContext()->isFunctionOrMethod())) {
Anders Carlsson2127ecc2010-10-22 23:37:08 +000010005 D->setUsed();
Douglas Gregorfc2ca562010-04-07 20:29:57 +000010006 return;
10007 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +000010008
Douglas Gregorfc2ca562010-04-07 20:29:57 +000010009 if (!isa<VarDecl>(D) && !isa<FunctionDecl>(D))
10010 return;
Sean Hunt1e3f5ba2010-04-28 23:02:27 +000010011
Douglas Gregore0762c92009-06-19 23:52:42 +000010012 // Do not mark anything as "used" within a dependent context; wait for
10013 // an instantiation.
10014 if (CurContext->isDependentContext())
10015 return;
Mike Stump1eb44332009-09-09 15:08:12 +000010016
Douglas Gregor2afce722009-11-26 00:44:06 +000010017 switch (ExprEvalContexts.back().Context) {
Douglas Gregorac7610d2009-06-22 20:57:11 +000010018 case Unevaluated:
10019 // We are in an expression that is not potentially evaluated; do nothing.
10020 return;
Mike Stump1eb44332009-09-09 15:08:12 +000010021
Douglas Gregorac7610d2009-06-22 20:57:11 +000010022 case PotentiallyEvaluated:
10023 // We are in a potentially-evaluated expression, so this declaration is
10024 // "used"; handle this below.
10025 break;
Mike Stump1eb44332009-09-09 15:08:12 +000010026
Douglas Gregorac7610d2009-06-22 20:57:11 +000010027 case PotentiallyPotentiallyEvaluated:
10028 // We are in an expression that may be potentially evaluated; queue this
10029 // declaration reference until we know whether the expression is
10030 // potentially evaluated.
Douglas Gregor2afce722009-11-26 00:44:06 +000010031 ExprEvalContexts.back().addReferencedDecl(Loc, D);
Douglas Gregorac7610d2009-06-22 20:57:11 +000010032 return;
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +000010033
10034 case PotentiallyEvaluatedIfUsed:
10035 // Referenced declarations will only be used if the construct in the
10036 // containing expression is used.
10037 return;
Douglas Gregorac7610d2009-06-22 20:57:11 +000010038 }
Mike Stump1eb44332009-09-09 15:08:12 +000010039
Douglas Gregore0762c92009-06-19 23:52:42 +000010040 // Note that this declaration has been used.
Fariborz Jahanianb7f4cc02009-06-22 17:30:33 +000010041 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) {
Sean Hunt1e238652011-05-12 03:51:51 +000010042 if (Constructor->isDefaulted() && Constructor->isDefaultConstructor()) {
10043 if (Constructor->isTrivial())
Chandler Carruth4e6fbce2010-08-23 07:55:51 +000010044 return;
10045 if (!Constructor->isUsed(false))
10046 DefineImplicitDefaultConstructor(Loc, Constructor);
Sean Hunt509f0482011-05-14 18:20:50 +000010047 } else if (Constructor->isDefaulted() &&
Sean Hunt49634cf2011-05-13 06:10:58 +000010048 Constructor->isCopyConstructor()) {
Douglas Gregorc070cc62010-06-17 23:14:26 +000010049 if (!Constructor->isUsed(false))
Sean Hunt49634cf2011-05-13 06:10:58 +000010050 DefineImplicitCopyConstructor(Loc, Constructor);
Fariborz Jahanian485f0872009-06-22 23:34:40 +000010051 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010052
Douglas Gregor6fb745b2010-05-13 16:44:06 +000010053 MarkVTableUsed(Loc, Constructor->getParent());
Fariborz Jahanian8d2b3562009-06-26 23:49:16 +000010054 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) {
Sean Huntcb45a0f2011-05-12 22:46:25 +000010055 if (Destructor->isDefaulted() && !Destructor->isUsed(false))
Fariborz Jahanian8d2b3562009-06-26 23:49:16 +000010056 DefineImplicitDestructor(Loc, Destructor);
Douglas Gregor6fb745b2010-05-13 16:44:06 +000010057 if (Destructor->isVirtual())
10058 MarkVTableUsed(Loc, Destructor->getParent());
Fariborz Jahanianc75bc2d2009-06-25 21:45:19 +000010059 } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D)) {
Sean Hunt2b188082011-05-14 05:23:28 +000010060 if (MethodDecl->isDefaulted() && MethodDecl->isOverloadedOperator() &&
Fariborz Jahanianc75bc2d2009-06-25 21:45:19 +000010061 MethodDecl->getOverloadedOperator() == OO_Equal) {
Douglas Gregorc070cc62010-06-17 23:14:26 +000010062 if (!MethodDecl->isUsed(false))
Douglas Gregor39957dc2010-05-01 15:04:51 +000010063 DefineImplicitCopyAssignment(Loc, MethodDecl);
Douglas Gregor6fb745b2010-05-13 16:44:06 +000010064 } else if (MethodDecl->isVirtual())
10065 MarkVTableUsed(Loc, MethodDecl->getParent());
Fariborz Jahanianc75bc2d2009-06-25 21:45:19 +000010066 }
Fariborz Jahanianf5ed9e02009-06-24 22:09:44 +000010067 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) {
John McCall15e310a2011-02-19 02:53:41 +000010068 // Recursive functions should be marked when used from another function.
10069 if (CurContext == Function) return;
10070
Mike Stump1eb44332009-09-09 15:08:12 +000010071 // Implicit instantiation of function templates and member functions of
Douglas Gregor1637be72009-06-26 00:10:03 +000010072 // class templates.
Douglas Gregor6cfacfe2010-05-17 17:34:56 +000010073 if (Function->isImplicitlyInstantiable()) {
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +000010074 bool AlreadyInstantiated = false;
10075 if (FunctionTemplateSpecializationInfo *SpecInfo
10076 = Function->getTemplateSpecializationInfo()) {
10077 if (SpecInfo->getPointOfInstantiation().isInvalid())
10078 SpecInfo->setPointOfInstantiation(Loc);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010079 else if (SpecInfo->getTemplateSpecializationKind()
Douglas Gregor3b846b62009-10-27 20:53:28 +000010080 == TSK_ImplicitInstantiation)
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +000010081 AlreadyInstantiated = true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010082 } else if (MemberSpecializationInfo *MSInfo
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +000010083 = Function->getMemberSpecializationInfo()) {
10084 if (MSInfo->getPointOfInstantiation().isInvalid())
10085 MSInfo->setPointOfInstantiation(Loc);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010086 else if (MSInfo->getTemplateSpecializationKind()
Douglas Gregor3b846b62009-10-27 20:53:28 +000010087 == TSK_ImplicitInstantiation)
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +000010088 AlreadyInstantiated = true;
10089 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010090
Douglas Gregor60406be2010-01-16 22:29:39 +000010091 if (!AlreadyInstantiated) {
10092 if (isa<CXXRecordDecl>(Function->getDeclContext()) &&
10093 cast<CXXRecordDecl>(Function->getDeclContext())->isLocalClass())
10094 PendingLocalImplicitInstantiations.push_back(std::make_pair(Function,
10095 Loc));
10096 else
Chandler Carruth62c78d52010-08-25 08:44:16 +000010097 PendingInstantiations.push_back(std::make_pair(Function, Loc));
Douglas Gregor60406be2010-01-16 22:29:39 +000010098 }
John McCall15e310a2011-02-19 02:53:41 +000010099 } else {
10100 // Walk redefinitions, as some of them may be instantiable.
Gabor Greif40181c42010-08-28 00:16:06 +000010101 for (FunctionDecl::redecl_iterator i(Function->redecls_begin()),
10102 e(Function->redecls_end()); i != e; ++i) {
Gabor Greifbe9ebe32010-08-28 01:58:12 +000010103 if (!i->isUsed(false) && i->isImplicitlyInstantiable())
Gabor Greif40181c42010-08-28 00:16:06 +000010104 MarkDeclarationReferenced(Loc, *i);
10105 }
John McCall15e310a2011-02-19 02:53:41 +000010106 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010107
John McCall15e310a2011-02-19 02:53:41 +000010108 // Keep track of used but undefined functions.
10109 if (!Function->isPure() && !Function->hasBody() &&
10110 Function->getLinkage() != ExternalLinkage) {
10111 SourceLocation &old = UndefinedInternals[Function->getCanonicalDecl()];
10112 if (old.isInvalid()) old = Loc;
10113 }
Argyrios Kyrtzidis58b52592010-08-25 10:34:54 +000010114
John McCall15e310a2011-02-19 02:53:41 +000010115 Function->setUsed(true);
Douglas Gregore0762c92009-06-19 23:52:42 +000010116 return;
Douglas Gregord7f37bf2009-06-22 23:06:13 +000010117 }
Mike Stump1eb44332009-09-09 15:08:12 +000010118
Douglas Gregore0762c92009-06-19 23:52:42 +000010119 if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
Douglas Gregor7caa6822009-07-24 20:34:43 +000010120 // Implicit instantiation of static data members of class templates.
Mike Stump1eb44332009-09-09 15:08:12 +000010121 if (Var->isStaticDataMember() &&
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +000010122 Var->getInstantiatedFromStaticDataMember()) {
10123 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo();
10124 assert(MSInfo && "Missing member specialization information?");
10125 if (MSInfo->getPointOfInstantiation().isInvalid() &&
10126 MSInfo->getTemplateSpecializationKind()== TSK_ImplicitInstantiation) {
10127 MSInfo->setPointOfInstantiation(Loc);
Sebastian Redlf79a7192011-04-29 08:19:30 +000010128 // This is a modification of an existing AST node. Notify listeners.
10129 if (ASTMutationListener *L = getASTMutationListener())
10130 L->StaticDataMemberInstantiated(Var);
Chandler Carruth62c78d52010-08-25 08:44:16 +000010131 PendingInstantiations.push_back(std::make_pair(Var, Loc));
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +000010132 }
10133 }
Mike Stump1eb44332009-09-09 15:08:12 +000010134
John McCall77efc682011-02-21 19:25:48 +000010135 // Keep track of used but undefined variables. We make a hole in
10136 // the warning for static const data members with in-line
10137 // initializers.
John McCall15e310a2011-02-19 02:53:41 +000010138 if (Var->hasDefinition() == VarDecl::DeclarationOnly
John McCall77efc682011-02-21 19:25:48 +000010139 && Var->getLinkage() != ExternalLinkage
10140 && !(Var->isStaticDataMember() && Var->hasInit())) {
John McCall15e310a2011-02-19 02:53:41 +000010141 SourceLocation &old = UndefinedInternals[Var->getCanonicalDecl()];
10142 if (old.isInvalid()) old = Loc;
10143 }
Douglas Gregor7caa6822009-07-24 20:34:43 +000010144
Douglas Gregore0762c92009-06-19 23:52:42 +000010145 D->setUsed(true);
Douglas Gregor7caa6822009-07-24 20:34:43 +000010146 return;
Sam Weinigcce6ebc2009-09-11 03:29:30 +000010147 }
Douglas Gregore0762c92009-06-19 23:52:42 +000010148}
Anders Carlsson8c8d9192009-10-09 23:51:55 +000010149
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010150namespace {
Chandler Carruthdfc35e32010-06-09 08:17:30 +000010151 // Mark all of the declarations referenced
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010152 // FIXME: Not fully implemented yet! We need to have a better understanding
Chandler Carruthdfc35e32010-06-09 08:17:30 +000010153 // of when we're entering
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010154 class MarkReferencedDecls : public RecursiveASTVisitor<MarkReferencedDecls> {
10155 Sema &S;
10156 SourceLocation Loc;
Chandler Carruthdfc35e32010-06-09 08:17:30 +000010157
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010158 public:
10159 typedef RecursiveASTVisitor<MarkReferencedDecls> Inherited;
Chandler Carruthdfc35e32010-06-09 08:17:30 +000010160
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010161 MarkReferencedDecls(Sema &S, SourceLocation Loc) : S(S), Loc(Loc) { }
Chandler Carruthdfc35e32010-06-09 08:17:30 +000010162
10163 bool TraverseTemplateArgument(const TemplateArgument &Arg);
10164 bool TraverseRecordType(RecordType *T);
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010165 };
10166}
10167
Chandler Carruthdfc35e32010-06-09 08:17:30 +000010168bool MarkReferencedDecls::TraverseTemplateArgument(
10169 const TemplateArgument &Arg) {
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010170 if (Arg.getKind() == TemplateArgument::Declaration) {
10171 S.MarkDeclarationReferenced(Loc, Arg.getAsDecl());
10172 }
Chandler Carruthdfc35e32010-06-09 08:17:30 +000010173
10174 return Inherited::TraverseTemplateArgument(Arg);
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010175}
10176
Chandler Carruthdfc35e32010-06-09 08:17:30 +000010177bool MarkReferencedDecls::TraverseRecordType(RecordType *T) {
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010178 if (ClassTemplateSpecializationDecl *Spec
10179 = dyn_cast<ClassTemplateSpecializationDecl>(T->getDecl())) {
10180 const TemplateArgumentList &Args = Spec->getTemplateArgs();
Douglas Gregor910f8002010-11-07 23:05:16 +000010181 return TraverseTemplateArguments(Args.data(), Args.size());
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010182 }
10183
Chandler Carruthe3e210c2010-06-10 10:31:57 +000010184 return true;
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010185}
10186
10187void Sema::MarkDeclarationsReferencedInType(SourceLocation Loc, QualType T) {
10188 MarkReferencedDecls Marker(*this, Loc);
Chandler Carruthdfc35e32010-06-09 08:17:30 +000010189 Marker.TraverseType(Context.getCanonicalType(T));
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000010190}
10191
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +000010192namespace {
10193 /// \brief Helper class that marks all of the declarations referenced by
10194 /// potentially-evaluated subexpressions as "referenced".
10195 class EvaluatedExprMarker : public EvaluatedExprVisitor<EvaluatedExprMarker> {
10196 Sema &S;
10197
10198 public:
10199 typedef EvaluatedExprVisitor<EvaluatedExprMarker> Inherited;
10200
10201 explicit EvaluatedExprMarker(Sema &S) : Inherited(S.Context), S(S) { }
10202
10203 void VisitDeclRefExpr(DeclRefExpr *E) {
10204 S.MarkDeclarationReferenced(E->getLocation(), E->getDecl());
10205 }
10206
10207 void VisitMemberExpr(MemberExpr *E) {
10208 S.MarkDeclarationReferenced(E->getMemberLoc(), E->getMemberDecl());
Douglas Gregor4fcf5b22010-09-11 23:32:50 +000010209 Inherited::VisitMemberExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +000010210 }
10211
10212 void VisitCXXNewExpr(CXXNewExpr *E) {
10213 if (E->getConstructor())
10214 S.MarkDeclarationReferenced(E->getLocStart(), E->getConstructor());
10215 if (E->getOperatorNew())
10216 S.MarkDeclarationReferenced(E->getLocStart(), E->getOperatorNew());
10217 if (E->getOperatorDelete())
10218 S.MarkDeclarationReferenced(E->getLocStart(), E->getOperatorDelete());
Douglas Gregor4fcf5b22010-09-11 23:32:50 +000010219 Inherited::VisitCXXNewExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +000010220 }
10221
10222 void VisitCXXDeleteExpr(CXXDeleteExpr *E) {
10223 if (E->getOperatorDelete())
10224 S.MarkDeclarationReferenced(E->getLocStart(), E->getOperatorDelete());
Douglas Gregor5833b0b2010-09-14 22:55:20 +000010225 QualType Destroyed = S.Context.getBaseElementType(E->getDestroyedType());
10226 if (const RecordType *DestroyedRec = Destroyed->getAs<RecordType>()) {
10227 CXXRecordDecl *Record = cast<CXXRecordDecl>(DestroyedRec->getDecl());
10228 S.MarkDeclarationReferenced(E->getLocStart(),
10229 S.LookupDestructor(Record));
10230 }
10231
Douglas Gregor4fcf5b22010-09-11 23:32:50 +000010232 Inherited::VisitCXXDeleteExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +000010233 }
10234
10235 void VisitCXXConstructExpr(CXXConstructExpr *E) {
10236 S.MarkDeclarationReferenced(E->getLocStart(), E->getConstructor());
Douglas Gregor4fcf5b22010-09-11 23:32:50 +000010237 Inherited::VisitCXXConstructExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +000010238 }
10239
10240 void VisitBlockDeclRefExpr(BlockDeclRefExpr *E) {
10241 S.MarkDeclarationReferenced(E->getLocation(), E->getDecl());
10242 }
Douglas Gregor102ff972010-10-19 17:17:35 +000010243
10244 void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *E) {
10245 Visit(E->getExpr());
10246 }
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +000010247 };
10248}
10249
10250/// \brief Mark any declarations that appear within this expression or any
10251/// potentially-evaluated subexpressions as "referenced".
10252void Sema::MarkDeclarationsReferencedInExpr(Expr *E) {
10253 EvaluatedExprMarker(*this).Visit(E);
10254}
10255
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +000010256/// \brief Emit a diagnostic that describes an effect on the run-time behavior
10257/// of the program being compiled.
10258///
10259/// This routine emits the given diagnostic when the code currently being
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010260/// type-checked is "potentially evaluated", meaning that there is a
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +000010261/// possibility that the code will actually be executable. Code in sizeof()
10262/// expressions, code used only during overload resolution, etc., are not
10263/// potentially evaluated. This routine will suppress such diagnostics or,
10264/// in the absolutely nutty case of potentially potentially evaluated
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010265/// expressions (C++ typeid), queue the diagnostic to potentially emit it
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +000010266/// later.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010267///
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +000010268/// This routine should be used for all diagnostics that describe the run-time
10269/// behavior of a program, such as passing a non-POD value through an ellipsis.
10270/// Failure to do so will likely result in spurious diagnostics or failures
10271/// during overload resolution or within sizeof/alignof/typeof/typeid.
Ted Kremenek762696f2011-02-23 01:51:43 +000010272bool Sema::DiagRuntimeBehavior(SourceLocation Loc, const Stmt *stmt,
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +000010273 const PartialDiagnostic &PD) {
10274 switch (ExprEvalContexts.back().Context ) {
10275 case Unevaluated:
10276 // The argument will never be evaluated, so don't complain.
10277 break;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010278
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +000010279 case PotentiallyEvaluated:
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +000010280 case PotentiallyEvaluatedIfUsed:
Ted Kremenek351ba912011-02-23 01:52:04 +000010281 if (stmt && getCurFunctionOrMethodDecl()) {
10282 FunctionScopes.back()->PossiblyUnreachableDiags.
10283 push_back(sema::PossiblyUnreachableDiag(PD, Loc, stmt));
10284 }
10285 else
10286 Diag(Loc, PD);
10287
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +000010288 return true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010289
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +000010290 case PotentiallyPotentiallyEvaluated:
10291 ExprEvalContexts.back().addDiagnostic(Loc, PD);
10292 break;
10293 }
10294
10295 return false;
10296}
10297
Anders Carlsson8c8d9192009-10-09 23:51:55 +000010298bool Sema::CheckCallReturnType(QualType ReturnType, SourceLocation Loc,
10299 CallExpr *CE, FunctionDecl *FD) {
10300 if (ReturnType->isVoidType() || !ReturnType->isIncompleteType())
10301 return false;
10302
10303 PartialDiagnostic Note =
10304 FD ? PDiag(diag::note_function_with_incomplete_return_type_declared_here)
10305 << FD->getDeclName() : PDiag();
10306 SourceLocation NoteLoc = FD ? FD->getLocation() : SourceLocation();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010307
Anders Carlsson8c8d9192009-10-09 23:51:55 +000010308 if (RequireCompleteType(Loc, ReturnType,
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010309 FD ?
Anders Carlsson8c8d9192009-10-09 23:51:55 +000010310 PDiag(diag::err_call_function_incomplete_return)
10311 << CE->getSourceRange() << FD->getDeclName() :
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000010312 PDiag(diag::err_call_incomplete_return)
Anders Carlsson8c8d9192009-10-09 23:51:55 +000010313 << CE->getSourceRange(),
10314 std::make_pair(NoteLoc, Note)))
10315 return true;
10316
10317 return false;
10318}
10319
Douglas Gregor92c3a042011-01-19 16:50:08 +000010320// Diagnose the s/=/==/ and s/\|=/!=/ typos. Note that adding parentheses
John McCall5a881bb2009-10-12 21:59:07 +000010321// will prevent this condition from triggering, which is what we want.
10322void Sema::DiagnoseAssignmentAsCondition(Expr *E) {
10323 SourceLocation Loc;
10324
John McCalla52ef082009-11-11 02:41:58 +000010325 unsigned diagnostic = diag::warn_condition_is_assignment;
Douglas Gregor92c3a042011-01-19 16:50:08 +000010326 bool IsOrAssign = false;
John McCalla52ef082009-11-11 02:41:58 +000010327
John McCall5a881bb2009-10-12 21:59:07 +000010328 if (isa<BinaryOperator>(E)) {
10329 BinaryOperator *Op = cast<BinaryOperator>(E);
Douglas Gregor92c3a042011-01-19 16:50:08 +000010330 if (Op->getOpcode() != BO_Assign && Op->getOpcode() != BO_OrAssign)
John McCall5a881bb2009-10-12 21:59:07 +000010331 return;
10332
Douglas Gregor92c3a042011-01-19 16:50:08 +000010333 IsOrAssign = Op->getOpcode() == BO_OrAssign;
10334
John McCallc8d8ac52009-11-12 00:06:05 +000010335 // Greylist some idioms by putting them into a warning subcategory.
10336 if (ObjCMessageExpr *ME
10337 = dyn_cast<ObjCMessageExpr>(Op->getRHS()->IgnoreParenCasts())) {
10338 Selector Sel = ME->getSelector();
10339
John McCallc8d8ac52009-11-12 00:06:05 +000010340 // self = [<foo> init...]
Douglas Gregor813d8342011-02-18 22:29:55 +000010341 if (isSelfExpr(Op->getLHS()) && Sel.getNameForSlot(0).startswith("init"))
John McCallc8d8ac52009-11-12 00:06:05 +000010342 diagnostic = diag::warn_condition_is_idiomatic_assignment;
10343
10344 // <foo> = [<bar> nextObject]
Douglas Gregor813d8342011-02-18 22:29:55 +000010345 else if (Sel.isUnarySelector() && Sel.getNameForSlot(0) == "nextObject")
John McCallc8d8ac52009-11-12 00:06:05 +000010346 diagnostic = diag::warn_condition_is_idiomatic_assignment;
10347 }
John McCalla52ef082009-11-11 02:41:58 +000010348
John McCall5a881bb2009-10-12 21:59:07 +000010349 Loc = Op->getOperatorLoc();
10350 } else if (isa<CXXOperatorCallExpr>(E)) {
10351 CXXOperatorCallExpr *Op = cast<CXXOperatorCallExpr>(E);
Douglas Gregor92c3a042011-01-19 16:50:08 +000010352 if (Op->getOperator() != OO_Equal && Op->getOperator() != OO_PipeEqual)
John McCall5a881bb2009-10-12 21:59:07 +000010353 return;
10354
Douglas Gregor92c3a042011-01-19 16:50:08 +000010355 IsOrAssign = Op->getOperator() == OO_PipeEqual;
John McCall5a881bb2009-10-12 21:59:07 +000010356 Loc = Op->getOperatorLoc();
10357 } else {
10358 // Not an assignment.
10359 return;
10360 }
10361
Douglas Gregor55b38842010-04-14 16:09:52 +000010362 Diag(Loc, diagnostic) << E->getSourceRange();
Douglas Gregor92c3a042011-01-19 16:50:08 +000010363
Argyrios Kyrtzidisabdd3b32011-04-25 23:01:29 +000010364 SourceLocation Open = E->getSourceRange().getBegin();
10365 SourceLocation Close = PP.getLocForEndOfToken(E->getSourceRange().getEnd());
10366 Diag(Loc, diag::note_condition_assign_silence)
10367 << FixItHint::CreateInsertion(Open, "(")
10368 << FixItHint::CreateInsertion(Close, ")");
10369
Douglas Gregor92c3a042011-01-19 16:50:08 +000010370 if (IsOrAssign)
10371 Diag(Loc, diag::note_condition_or_assign_to_comparison)
10372 << FixItHint::CreateReplacement(Loc, "!=");
10373 else
10374 Diag(Loc, diag::note_condition_assign_to_comparison)
10375 << FixItHint::CreateReplacement(Loc, "==");
John McCall5a881bb2009-10-12 21:59:07 +000010376}
10377
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +000010378/// \brief Redundant parentheses over an equality comparison can indicate
10379/// that the user intended an assignment used as condition.
10380void Sema::DiagnoseEqualityWithExtraParens(ParenExpr *parenE) {
Argyrios Kyrtzidiscf1620a2011-02-01 22:23:56 +000010381 // Don't warn if the parens came from a macro.
10382 SourceLocation parenLoc = parenE->getLocStart();
10383 if (parenLoc.isInvalid() || parenLoc.isMacroID())
10384 return;
Argyrios Kyrtzidis170a6a22011-03-28 23:52:04 +000010385 // Don't warn for dependent expressions.
10386 if (parenE->isTypeDependent())
10387 return;
Argyrios Kyrtzidiscf1620a2011-02-01 22:23:56 +000010388
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +000010389 Expr *E = parenE->IgnoreParens();
10390
10391 if (BinaryOperator *opE = dyn_cast<BinaryOperator>(E))
Argyrios Kyrtzidis70f23302011-02-01 19:32:59 +000010392 if (opE->getOpcode() == BO_EQ &&
10393 opE->getLHS()->IgnoreParenImpCasts()->isModifiableLvalue(Context)
10394 == Expr::MLV_Valid) {
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +000010395 SourceLocation Loc = opE->getOperatorLoc();
Ted Kremenek006ae382011-02-01 22:36:09 +000010396
Ted Kremenekf7275cd2011-02-02 02:20:30 +000010397 Diag(Loc, diag::warn_equality_with_extra_parens) << E->getSourceRange();
Ted Kremenekf7275cd2011-02-02 02:20:30 +000010398 Diag(Loc, diag::note_equality_comparison_silence)
10399 << FixItHint::CreateRemoval(parenE->getSourceRange().getBegin())
10400 << FixItHint::CreateRemoval(parenE->getSourceRange().getEnd());
Argyrios Kyrtzidisabdd3b32011-04-25 23:01:29 +000010401 Diag(Loc, diag::note_equality_comparison_to_assign)
10402 << FixItHint::CreateReplacement(Loc, "=");
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +000010403 }
10404}
10405
John Wiegley429bb272011-04-08 18:41:53 +000010406ExprResult Sema::CheckBooleanCondition(Expr *E, SourceLocation Loc) {
John McCall5a881bb2009-10-12 21:59:07 +000010407 DiagnoseAssignmentAsCondition(E);
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +000010408 if (ParenExpr *parenE = dyn_cast<ParenExpr>(E))
10409 DiagnoseEqualityWithExtraParens(parenE);
John McCall5a881bb2009-10-12 21:59:07 +000010410
John McCall864c0412011-04-26 20:42:42 +000010411 ExprResult result = CheckPlaceholderExpr(E);
10412 if (result.isInvalid()) return ExprError();
10413 E = result.take();
Argyrios Kyrtzidis11ab7902010-11-01 18:49:26 +000010414
John McCall864c0412011-04-26 20:42:42 +000010415 if (!E->isTypeDependent()) {
John McCallf6a16482010-12-04 03:47:34 +000010416 if (getLangOptions().CPlusPlus)
10417 return CheckCXXBooleanCondition(E); // C++ 6.4p4
10418
John Wiegley429bb272011-04-08 18:41:53 +000010419 ExprResult ERes = DefaultFunctionArrayLvalueConversion(E);
10420 if (ERes.isInvalid())
10421 return ExprError();
10422 E = ERes.take();
John McCallabc56c72010-12-04 06:09:13 +000010423
10424 QualType T = E->getType();
John Wiegley429bb272011-04-08 18:41:53 +000010425 if (!T->isScalarType()) { // C99 6.8.4.1p1
10426 Diag(Loc, diag::err_typecheck_statement_requires_scalar)
10427 << T << E->getSourceRange();
10428 return ExprError();
10429 }
John McCall5a881bb2009-10-12 21:59:07 +000010430 }
10431
John Wiegley429bb272011-04-08 18:41:53 +000010432 return Owned(E);
John McCall5a881bb2009-10-12 21:59:07 +000010433}
Douglas Gregor586596f2010-05-06 17:25:47 +000010434
John McCall60d7b3a2010-08-24 06:29:42 +000010435ExprResult Sema::ActOnBooleanCondition(Scope *S, SourceLocation Loc,
10436 Expr *Sub) {
Douglas Gregoreecf38f2010-05-06 21:39:56 +000010437 if (!Sub)
Douglas Gregor586596f2010-05-06 17:25:47 +000010438 return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +000010439
10440 return CheckBooleanCondition(Sub, Loc);
Douglas Gregor586596f2010-05-06 17:25:47 +000010441}
John McCall2a984ca2010-10-12 00:20:44 +000010442
John McCall1de4d4e2011-04-07 08:22:57 +000010443namespace {
John McCall755d8492011-04-12 00:42:48 +000010444 /// A visitor for rebuilding a call to an __unknown_any expression
10445 /// to have an appropriate type.
10446 struct RebuildUnknownAnyFunction
10447 : StmtVisitor<RebuildUnknownAnyFunction, ExprResult> {
10448
10449 Sema &S;
10450
10451 RebuildUnknownAnyFunction(Sema &S) : S(S) {}
10452
10453 ExprResult VisitStmt(Stmt *S) {
10454 llvm_unreachable("unexpected statement!");
10455 return ExprError();
10456 }
10457
10458 ExprResult VisitExpr(Expr *expr) {
10459 S.Diag(expr->getExprLoc(), diag::err_unsupported_unknown_any_call)
10460 << expr->getSourceRange();
10461 return ExprError();
10462 }
10463
10464 /// Rebuild an expression which simply semantically wraps another
10465 /// expression which it shares the type and value kind of.
10466 template <class T> ExprResult rebuildSugarExpr(T *expr) {
10467 ExprResult subResult = Visit(expr->getSubExpr());
10468 if (subResult.isInvalid()) return ExprError();
10469
10470 Expr *subExpr = subResult.take();
10471 expr->setSubExpr(subExpr);
10472 expr->setType(subExpr->getType());
10473 expr->setValueKind(subExpr->getValueKind());
10474 assert(expr->getObjectKind() == OK_Ordinary);
10475 return expr;
10476 }
10477
10478 ExprResult VisitParenExpr(ParenExpr *paren) {
10479 return rebuildSugarExpr(paren);
10480 }
10481
10482 ExprResult VisitUnaryExtension(UnaryOperator *op) {
10483 return rebuildSugarExpr(op);
10484 }
10485
10486 ExprResult VisitUnaryAddrOf(UnaryOperator *op) {
10487 ExprResult subResult = Visit(op->getSubExpr());
10488 if (subResult.isInvalid()) return ExprError();
10489
10490 Expr *subExpr = subResult.take();
10491 op->setSubExpr(subExpr);
10492 op->setType(S.Context.getPointerType(subExpr->getType()));
10493 assert(op->getValueKind() == VK_RValue);
10494 assert(op->getObjectKind() == OK_Ordinary);
10495 return op;
10496 }
10497
10498 ExprResult resolveDecl(Expr *expr, ValueDecl *decl) {
10499 if (!isa<FunctionDecl>(decl)) return VisitExpr(expr);
10500
10501 expr->setType(decl->getType());
10502
10503 assert(expr->getValueKind() == VK_RValue);
10504 if (S.getLangOptions().CPlusPlus &&
10505 !(isa<CXXMethodDecl>(decl) &&
10506 cast<CXXMethodDecl>(decl)->isInstance()))
10507 expr->setValueKind(VK_LValue);
10508
10509 return expr;
10510 }
10511
10512 ExprResult VisitMemberExpr(MemberExpr *mem) {
10513 return resolveDecl(mem, mem->getMemberDecl());
10514 }
10515
10516 ExprResult VisitDeclRefExpr(DeclRefExpr *ref) {
10517 return resolveDecl(ref, ref->getDecl());
10518 }
10519 };
10520}
10521
10522/// Given a function expression of unknown-any type, try to rebuild it
10523/// to have a function type.
10524static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *fn) {
10525 ExprResult result = RebuildUnknownAnyFunction(S).Visit(fn);
10526 if (result.isInvalid()) return ExprError();
10527 return S.DefaultFunctionArrayConversion(result.take());
10528}
10529
10530namespace {
John McCall379b5152011-04-11 07:02:50 +000010531 /// A visitor for rebuilding an expression of type __unknown_anytype
10532 /// into one which resolves the type directly on the referring
10533 /// expression. Strict preservation of the original source
10534 /// structure is not a goal.
John McCall1de4d4e2011-04-07 08:22:57 +000010535 struct RebuildUnknownAnyExpr
John McCalla5fc4722011-04-09 22:50:59 +000010536 : StmtVisitor<RebuildUnknownAnyExpr, ExprResult> {
John McCall1de4d4e2011-04-07 08:22:57 +000010537
10538 Sema &S;
10539
10540 /// The current destination type.
10541 QualType DestType;
10542
10543 RebuildUnknownAnyExpr(Sema &S, QualType castType)
10544 : S(S), DestType(castType) {}
10545
John McCalla5fc4722011-04-09 22:50:59 +000010546 ExprResult VisitStmt(Stmt *S) {
John McCall379b5152011-04-11 07:02:50 +000010547 llvm_unreachable("unexpected statement!");
John McCalla5fc4722011-04-09 22:50:59 +000010548 return ExprError();
John McCall1de4d4e2011-04-07 08:22:57 +000010549 }
10550
John McCall379b5152011-04-11 07:02:50 +000010551 ExprResult VisitExpr(Expr *expr) {
10552 S.Diag(expr->getExprLoc(), diag::err_unsupported_unknown_any_expr)
10553 << expr->getSourceRange();
10554 return ExprError();
John McCall1de4d4e2011-04-07 08:22:57 +000010555 }
10556
John McCall379b5152011-04-11 07:02:50 +000010557 ExprResult VisitCallExpr(CallExpr *call);
10558 ExprResult VisitObjCMessageExpr(ObjCMessageExpr *message);
10559
John McCalla5fc4722011-04-09 22:50:59 +000010560 /// Rebuild an expression which simply semantically wraps another
10561 /// expression which it shares the type and value kind of.
10562 template <class T> ExprResult rebuildSugarExpr(T *expr) {
10563 ExprResult subResult = Visit(expr->getSubExpr());
John McCall755d8492011-04-12 00:42:48 +000010564 if (subResult.isInvalid()) return ExprError();
John McCalla5fc4722011-04-09 22:50:59 +000010565 Expr *subExpr = subResult.take();
10566 expr->setSubExpr(subExpr);
10567 expr->setType(subExpr->getType());
10568 expr->setValueKind(subExpr->getValueKind());
10569 assert(expr->getObjectKind() == OK_Ordinary);
10570 return expr;
10571 }
John McCall1de4d4e2011-04-07 08:22:57 +000010572
John McCalla5fc4722011-04-09 22:50:59 +000010573 ExprResult VisitParenExpr(ParenExpr *paren) {
10574 return rebuildSugarExpr(paren);
10575 }
10576
10577 ExprResult VisitUnaryExtension(UnaryOperator *op) {
10578 return rebuildSugarExpr(op);
10579 }
10580
John McCall755d8492011-04-12 00:42:48 +000010581 ExprResult VisitUnaryAddrOf(UnaryOperator *op) {
10582 const PointerType *ptr = DestType->getAs<PointerType>();
10583 if (!ptr) {
10584 S.Diag(op->getOperatorLoc(), diag::err_unknown_any_addrof)
10585 << op->getSourceRange();
10586 return ExprError();
10587 }
10588 assert(op->getValueKind() == VK_RValue);
10589 assert(op->getObjectKind() == OK_Ordinary);
10590 op->setType(DestType);
10591
10592 // Build the sub-expression as if it were an object of the pointee type.
10593 DestType = ptr->getPointeeType();
10594 ExprResult subResult = Visit(op->getSubExpr());
10595 if (subResult.isInvalid()) return ExprError();
10596 op->setSubExpr(subResult.take());
10597 return op;
10598 }
10599
John McCall379b5152011-04-11 07:02:50 +000010600 ExprResult VisitImplicitCastExpr(ImplicitCastExpr *ice);
John McCalla5fc4722011-04-09 22:50:59 +000010601
John McCall755d8492011-04-12 00:42:48 +000010602 ExprResult resolveDecl(Expr *expr, ValueDecl *decl);
John McCalla5fc4722011-04-09 22:50:59 +000010603
John McCall755d8492011-04-12 00:42:48 +000010604 ExprResult VisitMemberExpr(MemberExpr *mem) {
10605 return resolveDecl(mem, mem->getMemberDecl());
10606 }
John McCalla5fc4722011-04-09 22:50:59 +000010607
10608 ExprResult VisitDeclRefExpr(DeclRefExpr *ref) {
John McCall379b5152011-04-11 07:02:50 +000010609 return resolveDecl(ref, ref->getDecl());
John McCall1de4d4e2011-04-07 08:22:57 +000010610 }
10611 };
10612}
10613
John McCall379b5152011-04-11 07:02:50 +000010614/// Rebuilds a call expression which yielded __unknown_anytype.
10615ExprResult RebuildUnknownAnyExpr::VisitCallExpr(CallExpr *call) {
10616 Expr *callee = call->getCallee();
10617
10618 enum FnKind {
John McCallf5307512011-04-27 00:36:17 +000010619 FK_MemberFunction,
John McCall379b5152011-04-11 07:02:50 +000010620 FK_FunctionPointer,
10621 FK_BlockPointer
10622 };
10623
10624 FnKind kind;
10625 QualType type = callee->getType();
John McCallf5307512011-04-27 00:36:17 +000010626 if (type == S.Context.BoundMemberTy) {
10627 assert(isa<CXXMemberCallExpr>(call) || isa<CXXOperatorCallExpr>(call));
10628 kind = FK_MemberFunction;
10629 type = Expr::findBoundMemberType(callee);
John McCall379b5152011-04-11 07:02:50 +000010630 } else if (const PointerType *ptr = type->getAs<PointerType>()) {
10631 type = ptr->getPointeeType();
10632 kind = FK_FunctionPointer;
10633 } else {
10634 type = type->castAs<BlockPointerType>()->getPointeeType();
10635 kind = FK_BlockPointer;
10636 }
10637 const FunctionType *fnType = type->castAs<FunctionType>();
10638
10639 // Verify that this is a legal result type of a function.
10640 if (DestType->isArrayType() || DestType->isFunctionType()) {
10641 unsigned diagID = diag::err_func_returning_array_function;
10642 if (kind == FK_BlockPointer)
10643 diagID = diag::err_block_returning_array_function;
10644
10645 S.Diag(call->getExprLoc(), diagID)
10646 << DestType->isFunctionType() << DestType;
10647 return ExprError();
10648 }
10649
10650 // Otherwise, go ahead and set DestType as the call's result.
10651 call->setType(DestType.getNonLValueExprType(S.Context));
10652 call->setValueKind(Expr::getValueKindForType(DestType));
10653 assert(call->getObjectKind() == OK_Ordinary);
10654
10655 // Rebuild the function type, replacing the result type with DestType.
10656 if (const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(fnType))
10657 DestType = S.Context.getFunctionType(DestType,
10658 proto->arg_type_begin(),
10659 proto->getNumArgs(),
10660 proto->getExtProtoInfo());
10661 else
10662 DestType = S.Context.getFunctionNoProtoType(DestType,
10663 fnType->getExtInfo());
10664
10665 // Rebuild the appropriate pointer-to-function type.
10666 switch (kind) {
John McCallf5307512011-04-27 00:36:17 +000010667 case FK_MemberFunction:
John McCall379b5152011-04-11 07:02:50 +000010668 // Nothing to do.
10669 break;
10670
10671 case FK_FunctionPointer:
10672 DestType = S.Context.getPointerType(DestType);
10673 break;
10674
10675 case FK_BlockPointer:
10676 DestType = S.Context.getBlockPointerType(DestType);
10677 break;
10678 }
10679
10680 // Finally, we can recurse.
10681 ExprResult calleeResult = Visit(callee);
10682 if (!calleeResult.isUsable()) return ExprError();
10683 call->setCallee(calleeResult.take());
10684
10685 // Bind a temporary if necessary.
10686 return S.MaybeBindToTemporary(call);
10687}
10688
10689ExprResult RebuildUnknownAnyExpr::VisitObjCMessageExpr(ObjCMessageExpr *msg) {
John McCall755d8492011-04-12 00:42:48 +000010690 ObjCMethodDecl *method = msg->getMethodDecl();
10691 assert(method && "__unknown_anytype message without result type?");
John McCall379b5152011-04-11 07:02:50 +000010692
John McCall755d8492011-04-12 00:42:48 +000010693 // Verify that this is a legal result type of a call.
10694 if (DestType->isArrayType() || DestType->isFunctionType()) {
10695 S.Diag(msg->getExprLoc(), diag::err_func_returning_array_function)
10696 << DestType->isFunctionType() << DestType;
10697 return ExprError();
John McCall379b5152011-04-11 07:02:50 +000010698 }
10699
John McCall755d8492011-04-12 00:42:48 +000010700 assert(method->getResultType() == S.Context.UnknownAnyTy);
10701 method->setResultType(DestType);
10702
John McCall379b5152011-04-11 07:02:50 +000010703 // Change the type of the message.
John McCall755d8492011-04-12 00:42:48 +000010704 msg->setType(DestType.getNonReferenceType());
10705 msg->setValueKind(Expr::getValueKindForType(DestType));
John McCall379b5152011-04-11 07:02:50 +000010706
John McCall755d8492011-04-12 00:42:48 +000010707 return S.MaybeBindToTemporary(msg);
John McCall379b5152011-04-11 07:02:50 +000010708}
10709
10710ExprResult RebuildUnknownAnyExpr::VisitImplicitCastExpr(ImplicitCastExpr *ice) {
John McCall755d8492011-04-12 00:42:48 +000010711 // The only case we should ever see here is a function-to-pointer decay.
John McCall379b5152011-04-11 07:02:50 +000010712 assert(ice->getCastKind() == CK_FunctionToPointerDecay);
John McCall379b5152011-04-11 07:02:50 +000010713 assert(ice->getValueKind() == VK_RValue);
10714 assert(ice->getObjectKind() == OK_Ordinary);
10715
John McCall755d8492011-04-12 00:42:48 +000010716 ice->setType(DestType);
10717
John McCall379b5152011-04-11 07:02:50 +000010718 // Rebuild the sub-expression as the pointee (function) type.
10719 DestType = DestType->castAs<PointerType>()->getPointeeType();
10720
10721 ExprResult result = Visit(ice->getSubExpr());
10722 if (!result.isUsable()) return ExprError();
10723
10724 ice->setSubExpr(result.take());
10725 return S.Owned(ice);
10726}
10727
John McCall755d8492011-04-12 00:42:48 +000010728ExprResult RebuildUnknownAnyExpr::resolveDecl(Expr *expr, ValueDecl *decl) {
John McCall379b5152011-04-11 07:02:50 +000010729 ExprValueKind valueKind = VK_LValue;
John McCall379b5152011-04-11 07:02:50 +000010730 QualType type = DestType;
10731
10732 // We know how to make this work for certain kinds of decls:
10733
10734 // - functions
John McCall755d8492011-04-12 00:42:48 +000010735 if (FunctionDecl *fn = dyn_cast<FunctionDecl>(decl)) {
John McCall379b5152011-04-11 07:02:50 +000010736 // This is true because FunctionDecls must always have function
10737 // type, so we can't be resolving the entire thing at once.
10738 assert(type->isFunctionType());
10739
John McCallf5307512011-04-27 00:36:17 +000010740 if (CXXMethodDecl *method = dyn_cast<CXXMethodDecl>(fn))
10741 if (method->isInstance()) {
10742 valueKind = VK_RValue;
10743 type = S.Context.BoundMemberTy;
10744 }
10745
John McCall379b5152011-04-11 07:02:50 +000010746 // Function references aren't l-values in C.
10747 if (!S.getLangOptions().CPlusPlus)
10748 valueKind = VK_RValue;
10749
10750 // - variables
10751 } else if (isa<VarDecl>(decl)) {
John McCall755d8492011-04-12 00:42:48 +000010752 if (const ReferenceType *refTy = type->getAs<ReferenceType>()) {
10753 type = refTy->getPointeeType();
John McCall379b5152011-04-11 07:02:50 +000010754 } else if (type->isFunctionType()) {
John McCall755d8492011-04-12 00:42:48 +000010755 S.Diag(expr->getExprLoc(), diag::err_unknown_any_var_function_type)
10756 << decl << expr->getSourceRange();
10757 return ExprError();
John McCall379b5152011-04-11 07:02:50 +000010758 }
10759
10760 // - nothing else
10761 } else {
10762 S.Diag(expr->getExprLoc(), diag::err_unsupported_unknown_any_decl)
10763 << decl << expr->getSourceRange();
10764 return ExprError();
10765 }
10766
John McCall755d8492011-04-12 00:42:48 +000010767 decl->setType(DestType);
10768 expr->setType(type);
10769 expr->setValueKind(valueKind);
10770 return S.Owned(expr);
John McCall379b5152011-04-11 07:02:50 +000010771}
10772
John McCall1de4d4e2011-04-07 08:22:57 +000010773/// Check a cast of an unknown-any type. We intentionally only
10774/// trigger this for C-style casts.
John Wiegley429bb272011-04-08 18:41:53 +000010775ExprResult Sema::checkUnknownAnyCast(SourceRange typeRange, QualType castType,
10776 Expr *castExpr, CastKind &castKind,
10777 ExprValueKind &VK, CXXCastPath &path) {
John McCall1de4d4e2011-04-07 08:22:57 +000010778 // Rewrite the casted expression from scratch.
John McCalla5fc4722011-04-09 22:50:59 +000010779 ExprResult result = RebuildUnknownAnyExpr(*this, castType).Visit(castExpr);
10780 if (!result.isUsable()) return ExprError();
John McCall1de4d4e2011-04-07 08:22:57 +000010781
John McCalla5fc4722011-04-09 22:50:59 +000010782 castExpr = result.take();
10783 VK = castExpr->getValueKind();
10784 castKind = CK_NoOp;
10785
10786 return castExpr;
John McCall1de4d4e2011-04-07 08:22:57 +000010787}
10788
10789static ExprResult diagnoseUnknownAnyExpr(Sema &S, Expr *e) {
10790 Expr *orig = e;
John McCall379b5152011-04-11 07:02:50 +000010791 unsigned diagID = diag::err_uncasted_use_of_unknown_any;
John McCall1de4d4e2011-04-07 08:22:57 +000010792 while (true) {
10793 e = e->IgnoreParenImpCasts();
John McCall379b5152011-04-11 07:02:50 +000010794 if (CallExpr *call = dyn_cast<CallExpr>(e)) {
John McCall1de4d4e2011-04-07 08:22:57 +000010795 e = call->getCallee();
John McCall379b5152011-04-11 07:02:50 +000010796 diagID = diag::err_uncasted_call_of_unknown_any;
10797 } else {
John McCall1de4d4e2011-04-07 08:22:57 +000010798 break;
John McCall379b5152011-04-11 07:02:50 +000010799 }
John McCall1de4d4e2011-04-07 08:22:57 +000010800 }
10801
John McCall379b5152011-04-11 07:02:50 +000010802 SourceLocation loc;
10803 NamedDecl *d;
10804 if (DeclRefExpr *ref = dyn_cast<DeclRefExpr>(e)) {
10805 loc = ref->getLocation();
10806 d = ref->getDecl();
10807 } else if (MemberExpr *mem = dyn_cast<MemberExpr>(e)) {
10808 loc = mem->getMemberLoc();
10809 d = mem->getMemberDecl();
10810 } else if (ObjCMessageExpr *msg = dyn_cast<ObjCMessageExpr>(e)) {
10811 diagID = diag::err_uncasted_call_of_unknown_any;
10812 loc = msg->getSelectorLoc();
10813 d = msg->getMethodDecl();
10814 assert(d && "unknown method returning __unknown_any?");
10815 } else {
10816 S.Diag(e->getExprLoc(), diag::err_unsupported_unknown_any_expr)
10817 << e->getSourceRange();
10818 return ExprError();
10819 }
10820
10821 S.Diag(loc, diagID) << d << orig->getSourceRange();
John McCall1de4d4e2011-04-07 08:22:57 +000010822
10823 // Never recoverable.
10824 return ExprError();
10825}
10826
John McCall2a984ca2010-10-12 00:20:44 +000010827/// Check for operands with placeholder types and complain if found.
10828/// Returns true if there was an error and no recovery was possible.
John McCallfb8721c2011-04-10 19:13:55 +000010829ExprResult Sema::CheckPlaceholderExpr(Expr *E) {
John McCall1de4d4e2011-04-07 08:22:57 +000010830 // Placeholder types are always *exactly* the appropriate builtin type.
10831 QualType type = E->getType();
John McCall2a984ca2010-10-12 00:20:44 +000010832
John McCall1de4d4e2011-04-07 08:22:57 +000010833 // Overloaded expressions.
10834 if (type == Context.OverloadTy)
10835 return ResolveAndFixSingleFunctionTemplateSpecialization(E, false, true,
Douglas Gregordb2eae62011-03-16 19:16:25 +000010836 E->getSourceRange(),
John McCall1de4d4e2011-04-07 08:22:57 +000010837 QualType(),
10838 diag::err_ovl_unresolvable);
10839
John McCall864c0412011-04-26 20:42:42 +000010840 // Bound member functions.
10841 if (type == Context.BoundMemberTy) {
10842 Diag(E->getLocStart(), diag::err_invalid_use_of_bound_member_func)
10843 << E->getSourceRange();
10844 return ExprError();
10845 }
10846
John McCall1de4d4e2011-04-07 08:22:57 +000010847 // Expressions of unknown type.
10848 if (type == Context.UnknownAnyTy)
10849 return diagnoseUnknownAnyExpr(*this, E);
10850
10851 assert(!type->isPlaceholderType());
10852 return Owned(E);
John McCall2a984ca2010-10-12 00:20:44 +000010853}
Richard Trieubb9b80c2011-04-21 21:44:26 +000010854
10855bool Sema::CheckCaseExpression(Expr *expr) {
10856 if (expr->isTypeDependent())
10857 return true;
10858 if (expr->isValueDependent() || expr->isIntegerConstantExpr(Context))
10859 return expr->getType()->isIntegralOrEnumerationType();
10860 return false;
10861}