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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"
Anna Zaks67221552011-07-28 19:51:27 +000039#include "clang/Sema/SemaFixItUtils.h"
John McCall7cd088e2010-08-24 07:21:54 +000040#include "clang/Sema/Template.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000041using namespace clang;
John McCall781472f2010-08-25 08:40:02 +000042using namespace sema;
Reid Spencer5f016e22007-07-11 17:01:13 +000043
David Chisnall0f436562009-08-17 16:35:33 +000044
Douglas Gregor48f3bb92009-02-18 21:56:37 +000045/// \brief Determine whether the use of this declaration is valid, and
46/// emit any corresponding diagnostics.
47///
48/// This routine diagnoses various problems with referencing
49/// declarations that can occur when using a declaration. For example,
50/// it might warn if a deprecated or unavailable declaration is being
51/// used, or produce an error (and return true) if a C++0x deleted
52/// function is being used.
53///
Fariborz Jahanian8e5fc9b2010-12-21 00:44:01 +000054/// If IgnoreDeprecated is set to true, this should not warn about deprecated
Chris Lattner52338262009-10-25 22:31:57 +000055/// decls.
56///
Douglas Gregor48f3bb92009-02-18 21:56:37 +000057/// \returns true if there was an error (this declaration cannot be
58/// referenced), false otherwise.
Chris Lattner52338262009-10-25 22:31:57 +000059///
Fariborz Jahanian8e5fc9b2010-12-21 00:44:01 +000060bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc,
Fariborz Jahanian89ebaed2011-04-23 17:27:19 +000061 const ObjCInterfaceDecl *UnknownObjCClass) {
Douglas Gregor9b623632010-10-12 23:32:35 +000062 if (getLangOptions().CPlusPlus && isa<FunctionDecl>(D)) {
63 // If there were any diagnostics suppressed by template argument deduction,
64 // emit them now.
Chris Lattner5f9e2722011-07-23 10:55:15 +000065 llvm::DenseMap<Decl *, SmallVector<PartialDiagnosticAt, 1> >::iterator
Douglas Gregor9b623632010-10-12 23:32:35 +000066 Pos = SuppressedDiagnostics.find(D->getCanonicalDecl());
67 if (Pos != SuppressedDiagnostics.end()) {
Chris Lattner5f9e2722011-07-23 10:55:15 +000068 SmallVectorImpl<PartialDiagnosticAt> &Suppressed = Pos->second;
Douglas Gregor9b623632010-10-12 23:32:35 +000069 for (unsigned I = 0, N = Suppressed.size(); I != N; ++I)
70 Diag(Suppressed[I].first, Suppressed[I].second);
71
72 // Clear out the list of suppressed diagnostics, so that we don't emit
Douglas Gregor0a0d2b12011-03-23 00:50:03 +000073 // them again for this specialization. However, we don't obsolete this
Douglas Gregor9b623632010-10-12 23:32:35 +000074 // entry from the table, because we want to avoid ever emitting these
75 // diagnostics again.
76 Suppressed.clear();
77 }
78 }
79
Richard Smith34b41d92011-02-20 03:19:35 +000080 // See if this is an auto-typed variable whose initializer we are parsing.
Richard Smith483b9f32011-02-21 20:05:19 +000081 if (ParsingInitForAutoVars.count(D)) {
82 Diag(Loc, diag::err_auto_variable_cannot_appear_in_own_initializer)
83 << D->getDeclName();
84 return true;
Richard Smith34b41d92011-02-20 03:19:35 +000085 }
86
Douglas Gregor48f3bb92009-02-18 21:56:37 +000087 // See if this is a deleted function.
Douglas Gregor25d944a2009-02-24 04:26:15 +000088 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
Douglas Gregor48f3bb92009-02-18 21:56:37 +000089 if (FD->isDeleted()) {
90 Diag(Loc, diag::err_deleted_function_use);
John McCallf85e1932011-06-15 23:02:42 +000091 Diag(D->getLocation(), diag::note_unavailable_here) << 1 << true;
Douglas Gregor48f3bb92009-02-18 21:56:37 +000092 return true;
93 }
Douglas Gregor25d944a2009-02-24 04:26:15 +000094 }
Douglas Gregor48f3bb92009-02-18 21:56:37 +000095
Douglas Gregor0a0d2b12011-03-23 00:50:03 +000096 // See if this declaration is unavailable or deprecated.
97 std::string Message;
98 switch (D->getAvailability(&Message)) {
99 case AR_Available:
100 case AR_NotYetIntroduced:
101 break;
102
103 case AR_Deprecated:
104 EmitDeprecationWarning(D, Message, Loc, UnknownObjCClass);
105 break;
106
107 case AR_Unavailable:
Argyrios Kyrtzidis12189f52011-06-17 17:28:30 +0000108 if (cast<Decl>(CurContext)->getAvailability() != AR_Unavailable) {
109 if (Message.empty()) {
110 if (!UnknownObjCClass)
111 Diag(Loc, diag::err_unavailable) << D->getDeclName();
112 else
113 Diag(Loc, diag::warn_unavailable_fwdclass_message)
114 << D->getDeclName();
115 }
116 else
117 Diag(Loc, diag::err_unavailable_message)
118 << D->getDeclName() << Message;
119 Diag(D->getLocation(), diag::note_unavailable_here)
120 << isa<FunctionDecl>(D) << false;
Douglas Gregor0a0d2b12011-03-23 00:50:03 +0000121 }
Douglas Gregor0a0d2b12011-03-23 00:50:03 +0000122 break;
123 }
124
Anders Carlsson2127ecc2010-10-22 23:37:08 +0000125 // Warn if this is used but marked unused.
126 if (D->hasAttr<UnusedAttr>())
127 Diag(Loc, diag::warn_used_but_marked_unused) << D->getDeclName();
128
Douglas Gregor48f3bb92009-02-18 21:56:37 +0000129 return false;
Chris Lattner76a642f2009-02-15 22:43:40 +0000130}
131
Douglas Gregor0a0d2b12011-03-23 00:50:03 +0000132/// \brief Retrieve the message suffix that should be added to a
133/// diagnostic complaining about the given function being deleted or
134/// unavailable.
135std::string Sema::getDeletedOrUnavailableSuffix(const FunctionDecl *FD) {
136 // FIXME: C++0x implicitly-deleted special member functions could be
137 // detected here so that we could improve diagnostics to say, e.g.,
138 // "base class 'A' had a deleted copy constructor".
139 if (FD->isDeleted())
140 return std::string();
141
142 std::string Message;
143 if (FD->getAvailability(&Message))
144 return ": " + Message;
145
146 return std::string();
147}
148
Fariborz Jahanian5b530052009-05-13 18:09:35 +0000149/// DiagnoseSentinelCalls - This routine checks on method dispatch calls
Mike Stump1eb44332009-09-09 15:08:12 +0000150/// (and other functions in future), which have been declared with sentinel
Fariborz Jahanian5b530052009-05-13 18:09:35 +0000151/// attribute. It warns if call does not have the sentinel argument.
152///
153void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc,
Mike Stump1eb44332009-09-09 15:08:12 +0000154 Expr **Args, unsigned NumArgs) {
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000155 const SentinelAttr *attr = D->getAttr<SentinelAttr>();
Mike Stump1eb44332009-09-09 15:08:12 +0000156 if (!attr)
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000157 return;
Douglas Gregor92e986e2010-04-22 16:44:27 +0000158
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000159 int sentinelPos = attr->getSentinel();
160 int nullPos = attr->getNullPos();
Mike Stump1eb44332009-09-09 15:08:12 +0000161
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
Douglas Gregorf78c4e52011-07-30 08:57:03 +0000246 SourceLocation MissingNilLoc
247 = PP.getLocForEndOfToken(sentinelExpr->getLocEnd());
248 std::string NullValue;
249 if (isMethod && PP.getIdentifierInfo("nil")->hasMacroDefinition())
250 NullValue = "nil";
251 else if (PP.getIdentifierInfo("NULL")->hasMacroDefinition())
252 NullValue = "NULL";
253 else if (Context.getTypeSize(Context.IntTy)
254 == Context.getTypeSize(Context.getSizeType()))
255 NullValue = "0";
256 else
257 NullValue = "0L";
258
259 Diag(MissingNilLoc, diag::warn_missing_sentinel)
260 << isMethod
261 << FixItHint::CreateInsertion(MissingNilLoc, ", " + NullValue);
John McCall8eb662e2010-05-06 23:53:00 +0000262 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod;
Fariborz Jahanian5b530052009-05-13 18:09:35 +0000263}
264
Douglas Gregor4b2d3f72009-02-26 21:00:50 +0000265SourceRange Sema::getExprRange(ExprTy *E) const {
266 Expr *Ex = (Expr *)E;
267 return Ex? Ex->getSourceRange() : SourceRange();
268}
269
Chris Lattnere7a2e912008-07-25 21:10:04 +0000270//===----------------------------------------------------------------------===//
271// Standard Promotions and Conversions
272//===----------------------------------------------------------------------===//
273
Chris Lattnere7a2e912008-07-25 21:10:04 +0000274/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4).
John Wiegley429bb272011-04-08 18:41:53 +0000275ExprResult Sema::DefaultFunctionArrayConversion(Expr *E) {
Chris Lattnere7a2e912008-07-25 21:10:04 +0000276 QualType Ty = E->getType();
277 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type");
278
Chris Lattnere7a2e912008-07-25 21:10:04 +0000279 if (Ty->isFunctionType())
John Wiegley429bb272011-04-08 18:41:53 +0000280 E = ImpCastExprToType(E, Context.getPointerType(Ty),
281 CK_FunctionToPointerDecay).take();
Chris Lattner67d33d82008-07-25 21:33:13 +0000282 else if (Ty->isArrayType()) {
283 // In C90 mode, arrays only promote to pointers if the array expression is
284 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has
285 // type 'array of type' is converted to an expression that has type 'pointer
286 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression
287 // that has type 'array of type' ...". The relevant change is "an lvalue"
288 // (C90) to "an expression" (C99).
Argyrios Kyrtzidisc39a3d72008-09-11 04:25:59 +0000289 //
290 // C++ 4.2p1:
291 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of
292 // T" can be converted to an rvalue of type "pointer to T".
293 //
John McCall7eb0a9e2010-11-24 05:12:34 +0000294 if (getLangOptions().C99 || getLangOptions().CPlusPlus || E->isLValue())
John Wiegley429bb272011-04-08 18:41:53 +0000295 E = ImpCastExprToType(E, Context.getArrayDecayedType(Ty),
296 CK_ArrayToPointerDecay).take();
Chris Lattner67d33d82008-07-25 21:33:13 +0000297 }
John Wiegley429bb272011-04-08 18:41:53 +0000298 return Owned(E);
Chris Lattnere7a2e912008-07-25 21:10:04 +0000299}
300
Argyrios Kyrtzidis8a285ae2011-04-26 17:41:22 +0000301static void CheckForNullPointerDereference(Sema &S, Expr *E) {
302 // Check to see if we are dereferencing a null pointer. If so,
303 // and if not volatile-qualified, this is undefined behavior that the
304 // optimizer will delete, so warn about it. People sometimes try to use this
305 // to get a deterministic trap and are surprised by clang's behavior. This
306 // only handles the pattern "*null", which is a very syntactic check.
307 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E->IgnoreParenCasts()))
308 if (UO->getOpcode() == UO_Deref &&
309 UO->getSubExpr()->IgnoreParenCasts()->
310 isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull) &&
311 !UO->getType().isVolatileQualified()) {
312 S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
313 S.PDiag(diag::warn_indirection_through_null)
314 << UO->getSubExpr()->getSourceRange());
315 S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
316 S.PDiag(diag::note_indirection_through_null));
317 }
318}
319
John Wiegley429bb272011-04-08 18:41:53 +0000320ExprResult Sema::DefaultLvalueConversion(Expr *E) {
John McCall0ae287a2010-12-01 04:43:34 +0000321 // C++ [conv.lval]p1:
322 // A glvalue of a non-function, non-array type T can be
323 // converted to a prvalue.
John Wiegley429bb272011-04-08 18:41:53 +0000324 if (!E->isGLValue()) return Owned(E);
Kaelyn Uhraind6c88652011-08-05 23:18:04 +0000325
John McCall409fa9a2010-12-06 20:48:59 +0000326 QualType T = E->getType();
327 assert(!T.isNull() && "r-value conversion on typeless expression?");
John McCallf6a16482010-12-04 03:47:34 +0000328
John McCall409fa9a2010-12-06 20:48:59 +0000329 // Create a load out of an ObjCProperty l-value, if necessary.
330 if (E->getObjectKind() == OK_ObjCProperty) {
John Wiegley429bb272011-04-08 18:41:53 +0000331 ExprResult Res = ConvertPropertyForRValue(E);
332 if (Res.isInvalid())
333 return Owned(E);
334 E = Res.take();
John McCall409fa9a2010-12-06 20:48:59 +0000335 if (!E->isGLValue())
John Wiegley429bb272011-04-08 18:41:53 +0000336 return Owned(E);
Douglas Gregora873dfc2010-02-03 00:27:59 +0000337 }
John McCall409fa9a2010-12-06 20:48:59 +0000338
339 // We don't want to throw lvalue-to-rvalue casts on top of
340 // expressions of certain types in C++.
341 if (getLangOptions().CPlusPlus &&
342 (E->getType() == Context.OverloadTy ||
343 T->isDependentType() ||
344 T->isRecordType()))
John Wiegley429bb272011-04-08 18:41:53 +0000345 return Owned(E);
John McCall409fa9a2010-12-06 20:48:59 +0000346
347 // The C standard is actually really unclear on this point, and
348 // DR106 tells us what the result should be but not why. It's
349 // generally best to say that void types just doesn't undergo
350 // lvalue-to-rvalue at all. Note that expressions of unqualified
351 // 'void' type are never l-values, but qualified void can be.
352 if (T->isVoidType())
John Wiegley429bb272011-04-08 18:41:53 +0000353 return Owned(E);
John McCall409fa9a2010-12-06 20:48:59 +0000354
Argyrios Kyrtzidis8a285ae2011-04-26 17:41:22 +0000355 CheckForNullPointerDereference(*this, E);
356
John McCall409fa9a2010-12-06 20:48:59 +0000357 // C++ [conv.lval]p1:
358 // [...] If T is a non-class type, the type of the prvalue is the
359 // cv-unqualified version of T. Otherwise, the type of the
360 // rvalue is T.
361 //
362 // C99 6.3.2.1p2:
363 // If the lvalue has qualified type, the value has the unqualified
364 // version of the type of the lvalue; otherwise, the value has the
365 // type of the lvalue.
366 if (T.hasQualifiers())
367 T = T.getUnqualifiedType();
Ted Kremeneka0125d82011-02-16 01:57:07 +0000368
John Wiegley429bb272011-04-08 18:41:53 +0000369 return Owned(ImplicitCastExpr::Create(Context, T, CK_LValueToRValue,
370 E, 0, VK_RValue));
John McCall409fa9a2010-12-06 20:48:59 +0000371}
372
John Wiegley429bb272011-04-08 18:41:53 +0000373ExprResult Sema::DefaultFunctionArrayLvalueConversion(Expr *E) {
374 ExprResult Res = DefaultFunctionArrayConversion(E);
375 if (Res.isInvalid())
376 return ExprError();
377 Res = DefaultLvalueConversion(Res.take());
378 if (Res.isInvalid())
379 return ExprError();
380 return move(Res);
Douglas Gregora873dfc2010-02-03 00:27:59 +0000381}
382
383
Chris Lattnere7a2e912008-07-25 21:10:04 +0000384/// UsualUnaryConversions - Performs various conversions that are common to most
Mike Stump1eb44332009-09-09 15:08:12 +0000385/// operators (C99 6.3). The conversions of array and function types are
Chris Lattnerfc8f0e12011-04-15 05:22:18 +0000386/// sometimes suppressed. For example, the array->pointer conversion doesn't
Chris Lattnere7a2e912008-07-25 21:10:04 +0000387/// apply if the array is an argument to the sizeof or address (&) operators.
388/// In these instances, this routine should *not* be called.
John Wiegley429bb272011-04-08 18:41:53 +0000389ExprResult Sema::UsualUnaryConversions(Expr *E) {
John McCall0ae287a2010-12-01 04:43:34 +0000390 // First, convert to an r-value.
John Wiegley429bb272011-04-08 18:41:53 +0000391 ExprResult Res = DefaultFunctionArrayLvalueConversion(E);
392 if (Res.isInvalid())
393 return Owned(E);
394 E = Res.take();
John McCall0ae287a2010-12-01 04:43:34 +0000395
396 QualType Ty = E->getType();
Chris Lattnere7a2e912008-07-25 21:10:04 +0000397 assert(!Ty.isNull() && "UsualUnaryConversions - missing type");
John McCall0ae287a2010-12-01 04:43:34 +0000398
399 // Try to perform integral promotions if the object has a theoretically
400 // promotable type.
401 if (Ty->isIntegralOrUnscopedEnumerationType()) {
402 // C99 6.3.1.1p2:
403 //
404 // The following may be used in an expression wherever an int or
405 // unsigned int may be used:
406 // - an object or expression with an integer type whose integer
407 // conversion rank is less than or equal to the rank of int
408 // and unsigned int.
409 // - A bit-field of type _Bool, int, signed int, or unsigned int.
410 //
411 // If an int can represent all values of the original type, the
412 // value is converted to an int; otherwise, it is converted to an
413 // unsigned int. These are called the integer promotions. All
414 // other types are unchanged by the integer promotions.
415
416 QualType PTy = Context.isPromotableBitField(E);
417 if (!PTy.isNull()) {
John Wiegley429bb272011-04-08 18:41:53 +0000418 E = ImpCastExprToType(E, PTy, CK_IntegralCast).take();
419 return Owned(E);
John McCall0ae287a2010-12-01 04:43:34 +0000420 }
421 if (Ty->isPromotableIntegerType()) {
422 QualType PT = Context.getPromotedIntegerType(Ty);
John Wiegley429bb272011-04-08 18:41:53 +0000423 E = ImpCastExprToType(E, PT, CK_IntegralCast).take();
424 return Owned(E);
John McCall0ae287a2010-12-01 04:43:34 +0000425 }
Eli Friedman04e83572009-08-20 04:21:42 +0000426 }
John Wiegley429bb272011-04-08 18:41:53 +0000427 return Owned(E);
Chris Lattnere7a2e912008-07-25 21:10:04 +0000428}
429
Chris Lattner05faf172008-07-25 22:25:12 +0000430/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that
Mike Stump1eb44332009-09-09 15:08:12 +0000431/// do not have a prototype. Arguments that have type float are promoted to
Chris Lattner05faf172008-07-25 22:25:12 +0000432/// double. All other argument types are converted by UsualUnaryConversions().
John Wiegley429bb272011-04-08 18:41:53 +0000433ExprResult Sema::DefaultArgumentPromotion(Expr *E) {
434 QualType Ty = E->getType();
Chris Lattner05faf172008-07-25 22:25:12 +0000435 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type");
Mike Stump1eb44332009-09-09 15:08:12 +0000436
John Wiegley429bb272011-04-08 18:41:53 +0000437 ExprResult Res = UsualUnaryConversions(E);
438 if (Res.isInvalid())
439 return Owned(E);
440 E = Res.take();
John McCall40c29132010-12-06 18:36:11 +0000441
Chris Lattner05faf172008-07-25 22:25:12 +0000442 // If this is a 'float' (CVR qualified or typedef) promote to double.
Chris Lattner40378332010-05-16 04:01:30 +0000443 if (Ty->isSpecificBuiltinType(BuiltinType::Float))
John Wiegley429bb272011-04-08 18:41:53 +0000444 E = ImpCastExprToType(E, Context.DoubleTy, CK_FloatingCast).take();
445
446 return Owned(E);
Chris Lattner05faf172008-07-25 22:25:12 +0000447}
448
Chris Lattner312531a2009-04-12 08:11:20 +0000449/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but
450/// will warn if the resulting type is not a POD type, and rejects ObjC
John Wiegley429bb272011-04-08 18:41:53 +0000451/// interfaces passed by value.
452ExprResult Sema::DefaultVariadicArgumentPromotion(Expr *E, VariadicCallType CT,
John McCallf85e1932011-06-15 23:02:42 +0000453 FunctionDecl *FDecl) {
Douglas Gregor8d5e18c2011-06-17 00:15:10 +0000454 ExprResult ExprRes = CheckPlaceholderExpr(E);
455 if (ExprRes.isInvalid())
456 return ExprError();
457
458 ExprRes = DefaultArgumentPromotion(E);
John Wiegley429bb272011-04-08 18:41:53 +0000459 if (ExprRes.isInvalid())
460 return ExprError();
461 E = ExprRes.take();
Mike Stump1eb44332009-09-09 15:08:12 +0000462
Chris Lattner40378332010-05-16 04:01:30 +0000463 // __builtin_va_start takes the second argument as a "varargs" argument, but
464 // it doesn't actually do anything with it. It doesn't need to be non-pod
465 // etc.
466 if (FDecl && FDecl->getBuiltinID() == Builtin::BI__builtin_va_start)
John Wiegley429bb272011-04-08 18:41:53 +0000467 return Owned(E);
Chris Lattner40378332010-05-16 04:01:30 +0000468
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000469 // Don't allow one to pass an Objective-C interface to a vararg.
John Wiegley429bb272011-04-08 18:41:53 +0000470 if (E->getType()->isObjCObjectType() &&
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000471 DiagRuntimeBehavior(E->getLocStart(), 0,
472 PDiag(diag::err_cannot_pass_objc_interface_to_vararg)
473 << E->getType() << CT))
John Wiegley429bb272011-04-08 18:41:53 +0000474 return ExprError();
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000475
John McCallf85e1932011-06-15 23:02:42 +0000476 if (!E->getType().isPODType(Context)) {
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000477 // C++0x [expr.call]p7:
478 // Passing a potentially-evaluated argument of class type (Clause 9)
479 // having a non-trivial copy constructor, a non-trivial move constructor,
480 // or a non-trivial destructor, with no corresponding parameter,
481 // is conditionally-supported with implementation-defined semantics.
482 bool TrivialEnough = false;
483 if (getLangOptions().CPlusPlus0x && !E->getType()->isDependentType()) {
484 if (CXXRecordDecl *Record = E->getType()->getAsCXXRecordDecl()) {
485 if (Record->hasTrivialCopyConstructor() &&
486 Record->hasTrivialMoveConstructor() &&
487 Record->hasTrivialDestructor())
488 TrivialEnough = true;
489 }
490 }
John McCallf85e1932011-06-15 23:02:42 +0000491
492 if (!TrivialEnough &&
493 getLangOptions().ObjCAutoRefCount &&
494 E->getType()->isObjCLifetimeType())
495 TrivialEnough = true;
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000496
497 if (TrivialEnough) {
498 // Nothing to diagnose. This is okay.
499 } else if (DiagRuntimeBehavior(E->getLocStart(), 0,
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +0000500 PDiag(diag::warn_cannot_pass_non_pod_arg_to_vararg)
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000501 << getLangOptions().CPlusPlus0x << E->getType()
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000502 << CT)) {
503 // Turn this into a trap.
504 CXXScopeSpec SS;
505 UnqualifiedId Name;
506 Name.setIdentifier(PP.getIdentifierInfo("__builtin_trap"),
507 E->getLocStart());
508 ExprResult TrapFn = ActOnIdExpression(TUScope, SS, Name, true, false);
509 if (TrapFn.isInvalid())
510 return ExprError();
511
512 ExprResult Call = ActOnCallExpr(TUScope, TrapFn.get(), E->getLocStart(),
513 MultiExprArg(), E->getLocEnd());
514 if (Call.isInvalid())
515 return ExprError();
516
517 ExprResult Comma = ActOnBinOp(TUScope, E->getLocStart(), tok::comma,
518 Call.get(), E);
519 if (Comma.isInvalid())
520 return ExprError();
521
522 E = Comma.get();
523 }
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000524 }
525
John Wiegley429bb272011-04-08 18:41:53 +0000526 return Owned(E);
Anders Carlssondce5e2c2009-01-16 16:48:51 +0000527}
528
Chris Lattnere7a2e912008-07-25 21:10:04 +0000529/// UsualArithmeticConversions - Performs various conversions that are common to
530/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this
Mike Stump1eb44332009-09-09 15:08:12 +0000531/// routine returns the first non-arithmetic type found. The client is
Chris Lattnere7a2e912008-07-25 21:10:04 +0000532/// responsible for emitting appropriate error diagnostics.
533/// FIXME: verify the conversion rules for "complex int" are consistent with
534/// GCC.
Richard Trieu67e29332011-08-02 04:35:43 +0000535QualType Sema::UsualArithmeticConversions(ExprResult &lhsExpr,
536 ExprResult &rhsExpr,
Chris Lattnere7a2e912008-07-25 21:10:04 +0000537 bool isCompAssign) {
John Wiegley429bb272011-04-08 18:41:53 +0000538 if (!isCompAssign) {
539 lhsExpr = UsualUnaryConversions(lhsExpr.take());
540 if (lhsExpr.isInvalid())
541 return QualType();
542 }
Eli Friedmanab3a8522009-03-28 01:22:36 +0000543
John Wiegley429bb272011-04-08 18:41:53 +0000544 rhsExpr = UsualUnaryConversions(rhsExpr.take());
545 if (rhsExpr.isInvalid())
546 return QualType();
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000547
Mike Stump1eb44332009-09-09 15:08:12 +0000548 // For conversion purposes, we ignore any qualifiers.
Chris Lattnere7a2e912008-07-25 21:10:04 +0000549 // For example, "const float" and "float" are equivalent.
Chris Lattnerb77792e2008-07-26 22:17:49 +0000550 QualType lhs =
John Wiegley429bb272011-04-08 18:41:53 +0000551 Context.getCanonicalType(lhsExpr.get()->getType()).getUnqualifiedType();
Mike Stump1eb44332009-09-09 15:08:12 +0000552 QualType rhs =
John Wiegley429bb272011-04-08 18:41:53 +0000553 Context.getCanonicalType(rhsExpr.get()->getType()).getUnqualifiedType();
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000554
555 // If both types are identical, no conversion is needed.
556 if (lhs == rhs)
557 return lhs;
558
559 // If either side is a non-arithmetic type (e.g. a pointer), we are done.
560 // The caller can deal with this (e.g. pointer + int).
561 if (!lhs->isArithmeticType() || !rhs->isArithmeticType())
562 return lhs;
563
John McCallcf33b242010-11-13 08:17:45 +0000564 // Apply unary and bitfield promotions to the LHS's type.
565 QualType lhs_unpromoted = lhs;
566 if (lhs->isPromotableIntegerType())
567 lhs = Context.getPromotedIntegerType(lhs);
John Wiegley429bb272011-04-08 18:41:53 +0000568 QualType LHSBitfieldPromoteTy = Context.isPromotableBitField(lhsExpr.get());
Douglas Gregor2d833e32009-05-02 00:36:19 +0000569 if (!LHSBitfieldPromoteTy.isNull())
570 lhs = LHSBitfieldPromoteTy;
John McCallcf33b242010-11-13 08:17:45 +0000571 if (lhs != lhs_unpromoted && !isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000572 lhsExpr = ImpCastExprToType(lhsExpr.take(), lhs, CK_IntegralCast);
Douglas Gregor2d833e32009-05-02 00:36:19 +0000573
John McCallcf33b242010-11-13 08:17:45 +0000574 // If both types are identical, no conversion is needed.
575 if (lhs == rhs)
576 return lhs;
577
578 // At this point, we have two different arithmetic types.
579
580 // Handle complex types first (C99 6.3.1.8p1).
581 bool LHSComplexFloat = lhs->isComplexType();
582 bool RHSComplexFloat = rhs->isComplexType();
583 if (LHSComplexFloat || RHSComplexFloat) {
584 // if we have an integer operand, the result is the complex type.
585
John McCall2bb5d002010-11-13 09:02:35 +0000586 if (!RHSComplexFloat && !rhs->isRealFloatingType()) {
587 if (rhs->isIntegerType()) {
588 QualType fp = cast<ComplexType>(lhs)->getElementType();
John Wiegley429bb272011-04-08 18:41:53 +0000589 rhsExpr = ImpCastExprToType(rhsExpr.take(), fp, CK_IntegralToFloating);
Richard Trieu67e29332011-08-02 04:35:43 +0000590 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs,
591 CK_FloatingRealToComplex);
John McCall2bb5d002010-11-13 09:02:35 +0000592 } else {
593 assert(rhs->isComplexIntegerType());
Richard Trieu67e29332011-08-02 04:35:43 +0000594 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs,
595 CK_IntegralComplexToFloatingComplex);
John McCall2bb5d002010-11-13 09:02:35 +0000596 }
John McCallcf33b242010-11-13 08:17:45 +0000597 return lhs;
598 }
599
John McCall2bb5d002010-11-13 09:02:35 +0000600 if (!LHSComplexFloat && !lhs->isRealFloatingType()) {
601 if (!isCompAssign) {
602 // int -> float -> _Complex float
603 if (lhs->isIntegerType()) {
604 QualType fp = cast<ComplexType>(rhs)->getElementType();
Richard Trieu67e29332011-08-02 04:35:43 +0000605 lhsExpr = ImpCastExprToType(lhsExpr.take(), fp,
606 CK_IntegralToFloating);
607 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs,
608 CK_FloatingRealToComplex);
John McCall2bb5d002010-11-13 09:02:35 +0000609 } else {
610 assert(lhs->isComplexIntegerType());
Richard Trieu67e29332011-08-02 04:35:43 +0000611 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs,
612 CK_IntegralComplexToFloatingComplex);
John McCall2bb5d002010-11-13 09:02:35 +0000613 }
614 }
John McCallcf33b242010-11-13 08:17:45 +0000615 return rhs;
616 }
617
618 // This handles complex/complex, complex/float, or float/complex.
619 // When both operands are complex, the shorter operand is converted to the
620 // type of the longer, and that is the type of the result. This corresponds
621 // to what is done when combining two real floating-point operands.
622 // The fun begins when size promotion occur across type domains.
623 // From H&S 6.3.4: When one operand is complex and the other is a real
624 // floating-point type, the less precise type is converted, within it's
625 // real or complex domain, to the precision of the other type. For example,
626 // when combining a "long double" with a "double _Complex", the
627 // "double _Complex" is promoted to "long double _Complex".
628 int order = Context.getFloatingTypeOrder(lhs, rhs);
629
630 // If both are complex, just cast to the more precise type.
631 if (LHSComplexFloat && RHSComplexFloat) {
632 if (order > 0) {
633 // _Complex float -> _Complex double
Richard Trieu67e29332011-08-02 04:35:43 +0000634 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs,
635 CK_FloatingComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000636 return lhs;
637
638 } else if (order < 0) {
639 // _Complex float -> _Complex double
640 if (!isCompAssign)
Richard Trieu67e29332011-08-02 04:35:43 +0000641 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs,
642 CK_FloatingComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000643 return rhs;
644 }
645 return lhs;
646 }
647
648 // If just the LHS is complex, the RHS needs to be converted,
649 // and the LHS might need to be promoted.
650 if (LHSComplexFloat) {
651 if (order > 0) { // LHS is wider
652 // float -> _Complex double
John McCall2bb5d002010-11-13 09:02:35 +0000653 QualType fp = cast<ComplexType>(lhs)->getElementType();
John Wiegley429bb272011-04-08 18:41:53 +0000654 rhsExpr = ImpCastExprToType(rhsExpr.take(), fp, CK_FloatingCast);
Richard Trieu67e29332011-08-02 04:35:43 +0000655 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs,
656 CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000657 return lhs;
658 }
659
660 // RHS is at least as wide. Find its corresponding complex type.
661 QualType result = (order == 0 ? lhs : Context.getComplexType(rhs));
662
663 // double -> _Complex double
Richard Trieu67e29332011-08-02 04:35:43 +0000664 rhsExpr = ImpCastExprToType(rhsExpr.take(), result,
665 CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000666
667 // _Complex float -> _Complex double
668 if (!isCompAssign && order < 0)
Richard Trieu67e29332011-08-02 04:35:43 +0000669 lhsExpr = ImpCastExprToType(lhsExpr.take(), result,
670 CK_FloatingComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000671
672 return result;
673 }
674
675 // Just the RHS is complex, so the LHS needs to be converted
676 // and the RHS might need to be promoted.
677 assert(RHSComplexFloat);
678
679 if (order < 0) { // RHS is wider
680 // float -> _Complex double
John McCall2bb5d002010-11-13 09:02:35 +0000681 if (!isCompAssign) {
Argyrios Kyrtzidise1889332011-01-18 18:49:33 +0000682 QualType fp = cast<ComplexType>(rhs)->getElementType();
John Wiegley429bb272011-04-08 18:41:53 +0000683 lhsExpr = ImpCastExprToType(lhsExpr.take(), fp, CK_FloatingCast);
Richard Trieu67e29332011-08-02 04:35:43 +0000684 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs,
685 CK_FloatingRealToComplex);
John McCall2bb5d002010-11-13 09:02:35 +0000686 }
John McCallcf33b242010-11-13 08:17:45 +0000687 return rhs;
688 }
689
690 // LHS is at least as wide. Find its corresponding complex type.
691 QualType result = (order == 0 ? rhs : Context.getComplexType(lhs));
692
693 // double -> _Complex double
694 if (!isCompAssign)
Richard Trieu67e29332011-08-02 04:35:43 +0000695 lhsExpr = ImpCastExprToType(lhsExpr.take(), result,
696 CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000697
698 // _Complex float -> _Complex double
699 if (order > 0)
Richard Trieu67e29332011-08-02 04:35:43 +0000700 rhsExpr = ImpCastExprToType(rhsExpr.take(), result,
701 CK_FloatingComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000702
703 return result;
704 }
705
706 // Now handle "real" floating types (i.e. float, double, long double).
707 bool LHSFloat = lhs->isRealFloatingType();
708 bool RHSFloat = rhs->isRealFloatingType();
709 if (LHSFloat || RHSFloat) {
710 // If we have two real floating types, convert the smaller operand
711 // to the bigger result.
712 if (LHSFloat && RHSFloat) {
713 int order = Context.getFloatingTypeOrder(lhs, rhs);
714 if (order > 0) {
John Wiegley429bb272011-04-08 18:41:53 +0000715 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_FloatingCast);
John McCallcf33b242010-11-13 08:17:45 +0000716 return lhs;
717 }
718
719 assert(order < 0 && "illegal float comparison");
720 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000721 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_FloatingCast);
John McCallcf33b242010-11-13 08:17:45 +0000722 return rhs;
723 }
724
725 // If we have an integer operand, the result is the real floating type.
726 if (LHSFloat) {
727 if (rhs->isIntegerType()) {
728 // Convert rhs to the lhs floating point type.
John Wiegley429bb272011-04-08 18:41:53 +0000729 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralToFloating);
John McCallcf33b242010-11-13 08:17:45 +0000730 return lhs;
731 }
732
733 // Convert both sides to the appropriate complex float.
734 assert(rhs->isComplexIntegerType());
735 QualType result = Context.getComplexType(lhs);
736
737 // _Complex int -> _Complex float
Richard Trieu67e29332011-08-02 04:35:43 +0000738 rhsExpr = ImpCastExprToType(rhsExpr.take(), result,
739 CK_IntegralComplexToFloatingComplex);
John McCallcf33b242010-11-13 08:17:45 +0000740
741 // float -> _Complex float
742 if (!isCompAssign)
Richard Trieu67e29332011-08-02 04:35:43 +0000743 lhsExpr = ImpCastExprToType(lhsExpr.take(), result,
744 CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000745
746 return result;
747 }
748
749 assert(RHSFloat);
750 if (lhs->isIntegerType()) {
751 // Convert lhs to the rhs floating point type.
752 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000753 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_IntegralToFloating);
John McCallcf33b242010-11-13 08:17:45 +0000754 return rhs;
755 }
756
757 // Convert both sides to the appropriate complex float.
758 assert(lhs->isComplexIntegerType());
759 QualType result = Context.getComplexType(rhs);
760
761 // _Complex int -> _Complex float
762 if (!isCompAssign)
Richard Trieu67e29332011-08-02 04:35:43 +0000763 lhsExpr = ImpCastExprToType(lhsExpr.take(), result,
764 CK_IntegralComplexToFloatingComplex);
John McCallcf33b242010-11-13 08:17:45 +0000765
766 // float -> _Complex float
Richard Trieu67e29332011-08-02 04:35:43 +0000767 rhsExpr = ImpCastExprToType(rhsExpr.take(), result,
768 CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000769
770 return result;
771 }
772
773 // Handle GCC complex int extension.
774 // FIXME: if the operands are (int, _Complex long), we currently
775 // don't promote the complex. Also, signedness?
776 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType();
777 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType();
778 if (lhsComplexInt && rhsComplexInt) {
779 int order = Context.getIntegerTypeOrder(lhsComplexInt->getElementType(),
780 rhsComplexInt->getElementType());
781 assert(order && "inequal types with equal element ordering");
782 if (order > 0) {
783 // _Complex int -> _Complex long
John Wiegley429bb272011-04-08 18:41:53 +0000784 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000785 return lhs;
786 }
787
788 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000789 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_IntegralComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000790 return rhs;
791 } else if (lhsComplexInt) {
792 // int -> _Complex int
John Wiegley429bb272011-04-08 18:41:53 +0000793 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000794 return lhs;
795 } else if (rhsComplexInt) {
796 // int -> _Complex int
797 if (!isCompAssign)
Richard Trieu67e29332011-08-02 04:35:43 +0000798 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs,
799 CK_IntegralRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000800 return rhs;
801 }
802
803 // Finally, we have two differing integer types.
804 // The rules for this case are in C99 6.3.1.8
805 int compare = Context.getIntegerTypeOrder(lhs, rhs);
806 bool lhsSigned = lhs->hasSignedIntegerRepresentation(),
807 rhsSigned = rhs->hasSignedIntegerRepresentation();
808 if (lhsSigned == rhsSigned) {
809 // Same signedness; use the higher-ranked type
810 if (compare >= 0) {
John Wiegley429bb272011-04-08 18:41:53 +0000811 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000812 return lhs;
813 } else if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000814 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000815 return rhs;
816 } else if (compare != (lhsSigned ? 1 : -1)) {
817 // The unsigned type has greater than or equal rank to the
818 // signed type, so use the unsigned type
819 if (rhsSigned) {
John Wiegley429bb272011-04-08 18:41:53 +0000820 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000821 return lhs;
822 } else if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000823 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000824 return rhs;
825 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) {
826 // The two types are different widths; if we are here, that
827 // means the signed type is larger than the unsigned type, so
828 // use the signed type.
829 if (lhsSigned) {
John Wiegley429bb272011-04-08 18:41:53 +0000830 rhsExpr = ImpCastExprToType(rhsExpr.take(), lhs, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000831 return lhs;
832 } else if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000833 lhsExpr = ImpCastExprToType(lhsExpr.take(), rhs, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000834 return rhs;
835 } else {
836 // The signed type is higher-ranked than the unsigned type,
837 // but isn't actually any bigger (like unsigned int and long
838 // on most 32-bit systems). Use the unsigned type corresponding
839 // to the signed type.
840 QualType result =
841 Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs);
John Wiegley429bb272011-04-08 18:41:53 +0000842 rhsExpr = ImpCastExprToType(rhsExpr.take(), result, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000843 if (!isCompAssign)
John Wiegley429bb272011-04-08 18:41:53 +0000844 lhsExpr = ImpCastExprToType(lhsExpr.take(), result, CK_IntegralCast);
John McCallcf33b242010-11-13 08:17:45 +0000845 return result;
846 }
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000847}
848
Chris Lattnere7a2e912008-07-25 21:10:04 +0000849//===----------------------------------------------------------------------===//
850// Semantic Analysis for various Expression Types
851//===----------------------------------------------------------------------===//
852
853
Peter Collingbournef111d932011-04-15 00:35:48 +0000854ExprResult
855Sema::ActOnGenericSelectionExpr(SourceLocation KeyLoc,
856 SourceLocation DefaultLoc,
857 SourceLocation RParenLoc,
858 Expr *ControllingExpr,
859 MultiTypeArg types,
860 MultiExprArg exprs) {
861 unsigned NumAssocs = types.size();
862 assert(NumAssocs == exprs.size());
863
864 ParsedType *ParsedTypes = types.release();
865 Expr **Exprs = exprs.release();
866
867 TypeSourceInfo **Types = new TypeSourceInfo*[NumAssocs];
868 for (unsigned i = 0; i < NumAssocs; ++i) {
869 if (ParsedTypes[i])
870 (void) GetTypeFromParser(ParsedTypes[i], &Types[i]);
871 else
872 Types[i] = 0;
873 }
874
875 ExprResult ER = CreateGenericSelectionExpr(KeyLoc, DefaultLoc, RParenLoc,
876 ControllingExpr, Types, Exprs,
877 NumAssocs);
Benjamin Kramer5bf47f72011-04-15 11:21:57 +0000878 delete [] Types;
Peter Collingbournef111d932011-04-15 00:35:48 +0000879 return ER;
880}
881
882ExprResult
883Sema::CreateGenericSelectionExpr(SourceLocation KeyLoc,
884 SourceLocation DefaultLoc,
885 SourceLocation RParenLoc,
886 Expr *ControllingExpr,
887 TypeSourceInfo **Types,
888 Expr **Exprs,
889 unsigned NumAssocs) {
890 bool TypeErrorFound = false,
891 IsResultDependent = ControllingExpr->isTypeDependent(),
892 ContainsUnexpandedParameterPack
893 = ControllingExpr->containsUnexpandedParameterPack();
894
895 for (unsigned i = 0; i < NumAssocs; ++i) {
896 if (Exprs[i]->containsUnexpandedParameterPack())
897 ContainsUnexpandedParameterPack = true;
898
899 if (Types[i]) {
900 if (Types[i]->getType()->containsUnexpandedParameterPack())
901 ContainsUnexpandedParameterPack = true;
902
903 if (Types[i]->getType()->isDependentType()) {
904 IsResultDependent = true;
905 } else {
906 // C1X 6.5.1.1p2 "The type name in a generic association shall specify a
907 // complete object type other than a variably modified type."
908 unsigned D = 0;
909 if (Types[i]->getType()->isIncompleteType())
910 D = diag::err_assoc_type_incomplete;
911 else if (!Types[i]->getType()->isObjectType())
912 D = diag::err_assoc_type_nonobject;
913 else if (Types[i]->getType()->isVariablyModifiedType())
914 D = diag::err_assoc_type_variably_modified;
915
916 if (D != 0) {
917 Diag(Types[i]->getTypeLoc().getBeginLoc(), D)
918 << Types[i]->getTypeLoc().getSourceRange()
919 << Types[i]->getType();
920 TypeErrorFound = true;
921 }
922
923 // C1X 6.5.1.1p2 "No two generic associations in the same generic
924 // selection shall specify compatible types."
925 for (unsigned j = i+1; j < NumAssocs; ++j)
926 if (Types[j] && !Types[j]->getType()->isDependentType() &&
927 Context.typesAreCompatible(Types[i]->getType(),
928 Types[j]->getType())) {
929 Diag(Types[j]->getTypeLoc().getBeginLoc(),
930 diag::err_assoc_compatible_types)
931 << Types[j]->getTypeLoc().getSourceRange()
932 << Types[j]->getType()
933 << Types[i]->getType();
934 Diag(Types[i]->getTypeLoc().getBeginLoc(),
935 diag::note_compat_assoc)
936 << Types[i]->getTypeLoc().getSourceRange()
937 << Types[i]->getType();
938 TypeErrorFound = true;
939 }
940 }
941 }
942 }
943 if (TypeErrorFound)
944 return ExprError();
945
946 // If we determined that the generic selection is result-dependent, don't
947 // try to compute the result expression.
948 if (IsResultDependent)
949 return Owned(new (Context) GenericSelectionExpr(
950 Context, KeyLoc, ControllingExpr,
951 Types, Exprs, NumAssocs, DefaultLoc,
952 RParenLoc, ContainsUnexpandedParameterPack));
953
Chris Lattner5f9e2722011-07-23 10:55:15 +0000954 SmallVector<unsigned, 1> CompatIndices;
Peter Collingbournef111d932011-04-15 00:35:48 +0000955 unsigned DefaultIndex = -1U;
956 for (unsigned i = 0; i < NumAssocs; ++i) {
957 if (!Types[i])
958 DefaultIndex = i;
959 else if (Context.typesAreCompatible(ControllingExpr->getType(),
960 Types[i]->getType()))
961 CompatIndices.push_back(i);
962 }
963
964 // C1X 6.5.1.1p2 "The controlling expression of a generic selection shall have
965 // type compatible with at most one of the types named in its generic
966 // association list."
967 if (CompatIndices.size() > 1) {
968 // We strip parens here because the controlling expression is typically
969 // parenthesized in macro definitions.
970 ControllingExpr = ControllingExpr->IgnoreParens();
971 Diag(ControllingExpr->getLocStart(), diag::err_generic_sel_multi_match)
972 << ControllingExpr->getSourceRange() << ControllingExpr->getType()
973 << (unsigned) CompatIndices.size();
Chris Lattner5f9e2722011-07-23 10:55:15 +0000974 for (SmallVector<unsigned, 1>::iterator I = CompatIndices.begin(),
Peter Collingbournef111d932011-04-15 00:35:48 +0000975 E = CompatIndices.end(); I != E; ++I) {
976 Diag(Types[*I]->getTypeLoc().getBeginLoc(),
977 diag::note_compat_assoc)
978 << Types[*I]->getTypeLoc().getSourceRange()
979 << Types[*I]->getType();
980 }
981 return ExprError();
982 }
983
984 // C1X 6.5.1.1p2 "If a generic selection has no default generic association,
985 // its controlling expression shall have type compatible with exactly one of
986 // the types named in its generic association list."
987 if (DefaultIndex == -1U && CompatIndices.size() == 0) {
988 // We strip parens here because the controlling expression is typically
989 // parenthesized in macro definitions.
990 ControllingExpr = ControllingExpr->IgnoreParens();
991 Diag(ControllingExpr->getLocStart(), diag::err_generic_sel_no_match)
992 << ControllingExpr->getSourceRange() << ControllingExpr->getType();
993 return ExprError();
994 }
995
996 // C1X 6.5.1.1p3 "If a generic selection has a generic association with a
997 // type name that is compatible with the type of the controlling expression,
998 // then the result expression of the generic selection is the expression
999 // in that generic association. Otherwise, the result expression of the
1000 // generic selection is the expression in the default generic association."
1001 unsigned ResultIndex =
1002 CompatIndices.size() ? CompatIndices[0] : DefaultIndex;
1003
1004 return Owned(new (Context) GenericSelectionExpr(
1005 Context, KeyLoc, ControllingExpr,
1006 Types, Exprs, NumAssocs, DefaultLoc,
1007 RParenLoc, ContainsUnexpandedParameterPack,
1008 ResultIndex));
1009}
1010
Steve Narofff69936d2007-09-16 03:34:24 +00001011/// ActOnStringLiteral - The specified tokens were lexed as pasted string
Reid Spencer5f016e22007-07-11 17:01:13 +00001012/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string
1013/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from
1014/// multiple tokens. However, the common case is that StringToks points to one
1015/// string.
Sebastian Redlcd965b92009-01-18 18:53:16 +00001016///
John McCall60d7b3a2010-08-24 06:29:42 +00001017ExprResult
Sean Hunt6cf75022010-08-30 17:47:05 +00001018Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) {
Reid Spencer5f016e22007-07-11 17:01:13 +00001019 assert(NumStringToks && "Must have at least one string!");
1020
Chris Lattnerbbee00b2009-01-16 18:51:42 +00001021 StringLiteralParser Literal(StringToks, NumStringToks, PP);
Reid Spencer5f016e22007-07-11 17:01:13 +00001022 if (Literal.hadError)
Sebastian Redlcd965b92009-01-18 18:53:16 +00001023 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00001024
Chris Lattner5f9e2722011-07-23 10:55:15 +00001025 SmallVector<SourceLocation, 4> StringTokLocs;
Reid Spencer5f016e22007-07-11 17:01:13 +00001026 for (unsigned i = 0; i != NumStringToks; ++i)
1027 StringTokLocs.push_back(StringToks[i].getLocation());
Chris Lattnera7ad98f2008-02-11 00:02:17 +00001028
Chris Lattnera7ad98f2008-02-11 00:02:17 +00001029 QualType StrTy = Context.CharTy;
Douglas Gregor5cee1192011-07-27 05:40:30 +00001030 if (Literal.isWide())
Anders Carlsson96b4adc2011-04-06 18:42:48 +00001031 StrTy = Context.getWCharType();
Douglas Gregor5cee1192011-07-27 05:40:30 +00001032 else if (Literal.isUTF16())
1033 StrTy = Context.Char16Ty;
1034 else if (Literal.isUTF32())
1035 StrTy = Context.Char32Ty;
Anders Carlsson96b4adc2011-04-06 18:42:48 +00001036 else if (Literal.Pascal)
1037 StrTy = Context.UnsignedCharTy;
Douglas Gregor77a52232008-09-12 00:47:35 +00001038
Douglas Gregor5cee1192011-07-27 05:40:30 +00001039 StringLiteral::StringKind Kind = StringLiteral::Ascii;
1040 if (Literal.isWide())
1041 Kind = StringLiteral::Wide;
1042 else if (Literal.isUTF8())
1043 Kind = StringLiteral::UTF8;
1044 else if (Literal.isUTF16())
1045 Kind = StringLiteral::UTF16;
1046 else if (Literal.isUTF32())
1047 Kind = StringLiteral::UTF32;
1048
Douglas Gregor77a52232008-09-12 00:47:35 +00001049 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
Chris Lattner7dc480f2010-06-15 18:05:34 +00001050 if (getLangOptions().CPlusPlus || getLangOptions().ConstStrings)
Douglas Gregor77a52232008-09-12 00:47:35 +00001051 StrTy.addConst();
Sebastian Redlcd965b92009-01-18 18:53:16 +00001052
Chris Lattnera7ad98f2008-02-11 00:02:17 +00001053 // Get an array type for the string, according to C99 6.4.5. This includes
1054 // the nul terminator character as well as the string length for pascal
1055 // strings.
1056 StrTy = Context.getConstantArrayType(StrTy,
Chris Lattnerdbb1ecc2009-02-26 23:01:51 +00001057 llvm::APInt(32, Literal.GetNumStringChars()+1),
Chris Lattnera7ad98f2008-02-11 00:02:17 +00001058 ArrayType::Normal, 0);
Mike Stump1eb44332009-09-09 15:08:12 +00001059
Reid Spencer5f016e22007-07-11 17:01:13 +00001060 // Pass &StringTokLocs[0], StringTokLocs.size() to factory!
Sean Hunt6cf75022010-08-30 17:47:05 +00001061 return Owned(StringLiteral::Create(Context, Literal.GetString(),
Douglas Gregor5cee1192011-07-27 05:40:30 +00001062 Kind, Literal.Pascal, StrTy,
Sean Hunt6cf75022010-08-30 17:47:05 +00001063 &StringTokLocs[0],
1064 StringTokLocs.size()));
Reid Spencer5f016e22007-07-11 17:01:13 +00001065}
1066
John McCall469a1eb2011-02-02 13:00:07 +00001067enum CaptureResult {
1068 /// No capture is required.
1069 CR_NoCapture,
1070
1071 /// A capture is required.
1072 CR_Capture,
1073
John McCall6b5a61b2011-02-07 10:33:21 +00001074 /// A by-ref capture is required.
1075 CR_CaptureByRef,
1076
John McCall469a1eb2011-02-02 13:00:07 +00001077 /// An error occurred when trying to capture the given variable.
1078 CR_Error
1079};
1080
1081/// Diagnose an uncapturable value reference.
Chris Lattner639e2d32008-10-20 05:16:36 +00001082///
John McCall469a1eb2011-02-02 13:00:07 +00001083/// \param var - the variable referenced
1084/// \param DC - the context which we couldn't capture through
1085static CaptureResult
John McCall6b5a61b2011-02-07 10:33:21 +00001086diagnoseUncapturableValueReference(Sema &S, SourceLocation loc,
John McCall469a1eb2011-02-02 13:00:07 +00001087 VarDecl *var, DeclContext *DC) {
1088 switch (S.ExprEvalContexts.back().Context) {
1089 case Sema::Unevaluated:
1090 // The argument will never be evaluated, so don't complain.
1091 return CR_NoCapture;
Mike Stump1eb44332009-09-09 15:08:12 +00001092
John McCall469a1eb2011-02-02 13:00:07 +00001093 case Sema::PotentiallyEvaluated:
1094 case Sema::PotentiallyEvaluatedIfUsed:
1095 break;
Chris Lattner639e2d32008-10-20 05:16:36 +00001096
John McCall469a1eb2011-02-02 13:00:07 +00001097 case Sema::PotentiallyPotentiallyEvaluated:
1098 // FIXME: delay these!
1099 break;
Chris Lattner17f3a6d2009-04-21 22:26:47 +00001100 }
Mike Stump1eb44332009-09-09 15:08:12 +00001101
John McCall469a1eb2011-02-02 13:00:07 +00001102 // Don't diagnose about capture if we're not actually in code right
1103 // now; in general, there are more appropriate places that will
1104 // diagnose this.
1105 if (!S.CurContext->isFunctionOrMethod()) return CR_NoCapture;
1106
John McCall4f38f412011-03-22 23:15:50 +00001107 // Certain madnesses can happen with parameter declarations, which
1108 // we want to ignore.
1109 if (isa<ParmVarDecl>(var)) {
1110 // - If the parameter still belongs to the translation unit, then
1111 // we're actually just using one parameter in the declaration of
1112 // the next. This is useful in e.g. VLAs.
1113 if (isa<TranslationUnitDecl>(var->getDeclContext()))
1114 return CR_NoCapture;
1115
1116 // - This particular madness can happen in ill-formed default
1117 // arguments; claim it's okay and let downstream code handle it.
1118 if (S.CurContext == var->getDeclContext()->getParent())
1119 return CR_NoCapture;
1120 }
John McCall469a1eb2011-02-02 13:00:07 +00001121
1122 DeclarationName functionName;
1123 if (FunctionDecl *fn = dyn_cast<FunctionDecl>(var->getDeclContext()))
1124 functionName = fn->getDeclName();
1125 // FIXME: variable from enclosing block that we couldn't capture from!
1126
1127 S.Diag(loc, diag::err_reference_to_local_var_in_enclosing_function)
1128 << var->getIdentifier() << functionName;
1129 S.Diag(var->getLocation(), diag::note_local_variable_declared_here)
1130 << var->getIdentifier();
1131
1132 return CR_Error;
Mike Stump1eb44332009-09-09 15:08:12 +00001133}
1134
John McCall6b5a61b2011-02-07 10:33:21 +00001135/// There is a well-formed capture at a particular scope level;
1136/// propagate it through all the nested blocks.
1137static CaptureResult propagateCapture(Sema &S, unsigned validScopeIndex,
1138 const BlockDecl::Capture &capture) {
1139 VarDecl *var = capture.getVariable();
1140
1141 // Update all the inner blocks with the capture information.
1142 for (unsigned i = validScopeIndex + 1, e = S.FunctionScopes.size();
1143 i != e; ++i) {
1144 BlockScopeInfo *innerBlock = cast<BlockScopeInfo>(S.FunctionScopes[i]);
1145 innerBlock->Captures.push_back(
1146 BlockDecl::Capture(capture.getVariable(), capture.isByRef(),
1147 /*nested*/ true, capture.getCopyExpr()));
1148 innerBlock->CaptureMap[var] = innerBlock->Captures.size(); // +1
1149 }
1150
1151 return capture.isByRef() ? CR_CaptureByRef : CR_Capture;
1152}
1153
1154/// shouldCaptureValueReference - Determine if a reference to the
John McCall469a1eb2011-02-02 13:00:07 +00001155/// given value in the current context requires a variable capture.
1156///
1157/// This also keeps the captures set in the BlockScopeInfo records
1158/// up-to-date.
John McCall6b5a61b2011-02-07 10:33:21 +00001159static CaptureResult shouldCaptureValueReference(Sema &S, SourceLocation loc,
John McCall469a1eb2011-02-02 13:00:07 +00001160 ValueDecl *value) {
1161 // Only variables ever require capture.
1162 VarDecl *var = dyn_cast<VarDecl>(value);
John McCall76a40212011-02-09 01:13:10 +00001163 if (!var) return CR_NoCapture;
John McCall469a1eb2011-02-02 13:00:07 +00001164
1165 // Fast path: variables from the current context never require capture.
1166 DeclContext *DC = S.CurContext;
1167 if (var->getDeclContext() == DC) return CR_NoCapture;
1168
1169 // Only variables with local storage require capture.
1170 // FIXME: What about 'const' variables in C++?
1171 if (!var->hasLocalStorage()) return CR_NoCapture;
1172
1173 // Otherwise, we need to capture.
1174
1175 unsigned functionScopesIndex = S.FunctionScopes.size() - 1;
John McCall469a1eb2011-02-02 13:00:07 +00001176 do {
1177 // Only blocks (and eventually C++0x closures) can capture; other
1178 // scopes don't work.
1179 if (!isa<BlockDecl>(DC))
John McCall6b5a61b2011-02-07 10:33:21 +00001180 return diagnoseUncapturableValueReference(S, loc, var, DC);
John McCall469a1eb2011-02-02 13:00:07 +00001181
1182 BlockScopeInfo *blockScope =
1183 cast<BlockScopeInfo>(S.FunctionScopes[functionScopesIndex]);
1184 assert(blockScope->TheDecl == static_cast<BlockDecl*>(DC));
1185
John McCall6b5a61b2011-02-07 10:33:21 +00001186 // Check whether we've already captured it in this block. If so,
1187 // we're done.
1188 if (unsigned indexPlus1 = blockScope->CaptureMap[var])
1189 return propagateCapture(S, functionScopesIndex,
1190 blockScope->Captures[indexPlus1 - 1]);
John McCall469a1eb2011-02-02 13:00:07 +00001191
1192 functionScopesIndex--;
1193 DC = cast<BlockDecl>(DC)->getDeclContext();
1194 } while (var->getDeclContext() != DC);
1195
John McCall6b5a61b2011-02-07 10:33:21 +00001196 // Okay, we descended all the way to the block that defines the variable.
1197 // Actually try to capture it.
1198 QualType type = var->getType();
1199
1200 // Prohibit variably-modified types.
1201 if (type->isVariablyModifiedType()) {
1202 S.Diag(loc, diag::err_ref_vm_type);
1203 S.Diag(var->getLocation(), diag::note_declared_at);
1204 return CR_Error;
1205 }
1206
1207 // Prohibit arrays, even in __block variables, but not references to
1208 // them.
1209 if (type->isArrayType()) {
1210 S.Diag(loc, diag::err_ref_array_type);
1211 S.Diag(var->getLocation(), diag::note_declared_at);
1212 return CR_Error;
1213 }
1214
1215 S.MarkDeclarationReferenced(loc, var);
1216
1217 // The BlocksAttr indicates the variable is bound by-reference.
1218 bool byRef = var->hasAttr<BlocksAttr>();
1219
1220 // Build a copy expression.
1221 Expr *copyExpr = 0;
John McCall642a75f2011-04-28 02:15:35 +00001222 const RecordType *rtype;
1223 if (!byRef && S.getLangOptions().CPlusPlus && !type->isDependentType() &&
1224 (rtype = type->getAs<RecordType>())) {
1225
1226 // The capture logic needs the destructor, so make sure we mark it.
1227 // Usually this is unnecessary because most local variables have
1228 // their destructors marked at declaration time, but parameters are
1229 // an exception because it's technically only the call site that
1230 // actually requires the destructor.
1231 if (isa<ParmVarDecl>(var))
1232 S.FinalizeVarWithDestructor(var, rtype);
1233
John McCall6b5a61b2011-02-07 10:33:21 +00001234 // According to the blocks spec, the capture of a variable from
1235 // the stack requires a const copy constructor. This is not true
1236 // of the copy/move done to move a __block variable to the heap.
1237 type.addConst();
1238
1239 Expr *declRef = new (S.Context) DeclRefExpr(var, type, VK_LValue, loc);
1240 ExprResult result =
1241 S.PerformCopyInitialization(
1242 InitializedEntity::InitializeBlock(var->getLocation(),
1243 type, false),
1244 loc, S.Owned(declRef));
1245
1246 // Build a full-expression copy expression if initialization
1247 // succeeded and used a non-trivial constructor. Recover from
1248 // errors by pretending that the copy isn't necessary.
1249 if (!result.isInvalid() &&
1250 !cast<CXXConstructExpr>(result.get())->getConstructor()->isTrivial()) {
1251 result = S.MaybeCreateExprWithCleanups(result);
1252 copyExpr = result.take();
1253 }
1254 }
1255
1256 // We're currently at the declarer; go back to the closure.
1257 functionScopesIndex++;
1258 BlockScopeInfo *blockScope =
1259 cast<BlockScopeInfo>(S.FunctionScopes[functionScopesIndex]);
1260
1261 // Build a valid capture in this scope.
1262 blockScope->Captures.push_back(
1263 BlockDecl::Capture(var, byRef, /*nested*/ false, copyExpr));
1264 blockScope->CaptureMap[var] = blockScope->Captures.size(); // +1
1265
1266 // Propagate that to inner captures if necessary.
1267 return propagateCapture(S, functionScopesIndex,
1268 blockScope->Captures.back());
1269}
1270
1271static ExprResult BuildBlockDeclRefExpr(Sema &S, ValueDecl *vd,
1272 const DeclarationNameInfo &NameInfo,
1273 bool byRef) {
1274 assert(isa<VarDecl>(vd) && "capturing non-variable");
1275
1276 VarDecl *var = cast<VarDecl>(vd);
1277 assert(var->hasLocalStorage() && "capturing non-local");
1278 assert(byRef == var->hasAttr<BlocksAttr>() && "byref set wrong");
1279
1280 QualType exprType = var->getType().getNonReferenceType();
1281
1282 BlockDeclRefExpr *BDRE;
1283 if (!byRef) {
1284 // The variable will be bound by copy; make it const within the
1285 // closure, but record that this was done in the expression.
1286 bool constAdded = !exprType.isConstQualified();
1287 exprType.addConst();
1288
1289 BDRE = new (S.Context) BlockDeclRefExpr(var, exprType, VK_LValue,
1290 NameInfo.getLoc(), false,
1291 constAdded);
1292 } else {
1293 BDRE = new (S.Context) BlockDeclRefExpr(var, exprType, VK_LValue,
1294 NameInfo.getLoc(), true);
1295 }
1296
1297 return S.Owned(BDRE);
John McCall469a1eb2011-02-02 13:00:07 +00001298}
Chris Lattner639e2d32008-10-20 05:16:36 +00001299
John McCall60d7b3a2010-08-24 06:29:42 +00001300ExprResult
John McCallf89e55a2010-11-18 06:31:45 +00001301Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
John McCall76a40212011-02-09 01:13:10 +00001302 SourceLocation Loc,
1303 const CXXScopeSpec *SS) {
Abramo Bagnara25777432010-08-11 22:01:17 +00001304 DeclarationNameInfo NameInfo(D->getDeclName(), Loc);
John McCallf89e55a2010-11-18 06:31:45 +00001305 return BuildDeclRefExpr(D, Ty, VK, NameInfo, SS);
Abramo Bagnara25777432010-08-11 22:01:17 +00001306}
1307
John McCall76a40212011-02-09 01:13:10 +00001308/// BuildDeclRefExpr - Build an expression that references a
1309/// declaration that does not require a closure capture.
John McCall60d7b3a2010-08-24 06:29:42 +00001310ExprResult
John McCall76a40212011-02-09 01:13:10 +00001311Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
Abramo Bagnara25777432010-08-11 22:01:17 +00001312 const DeclarationNameInfo &NameInfo,
1313 const CXXScopeSpec *SS) {
Abramo Bagnara25777432010-08-11 22:01:17 +00001314 MarkDeclarationReferenced(NameInfo.getLoc(), D);
Mike Stump1eb44332009-09-09 15:08:12 +00001315
John McCall7eb0a9e2010-11-24 05:12:34 +00001316 Expr *E = DeclRefExpr::Create(Context,
Douglas Gregor40d96a62011-02-28 21:54:11 +00001317 SS? SS->getWithLocInContext(Context)
1318 : NestedNameSpecifierLoc(),
John McCall7eb0a9e2010-11-24 05:12:34 +00001319 D, NameInfo, Ty, VK);
1320
1321 // Just in case we're building an illegal pointer-to-member.
1322 if (isa<FieldDecl>(D) && cast<FieldDecl>(D)->getBitWidth())
1323 E->setObjectKind(OK_BitField);
1324
1325 return Owned(E);
Douglas Gregor1a49af92009-01-06 05:10:23 +00001326}
1327
Abramo Bagnara25777432010-08-11 22:01:17 +00001328/// Decomposes the given name into a DeclarationNameInfo, its location, and
John McCall129e2df2009-11-30 22:42:35 +00001329/// possibly a list of template arguments.
1330///
1331/// If this produces template arguments, it is permitted to call
1332/// DecomposeTemplateName.
1333///
1334/// This actually loses a lot of source location information for
1335/// non-standard name kinds; we should consider preserving that in
1336/// some way.
Richard Trieu67e29332011-08-02 04:35:43 +00001337void
1338Sema::DecomposeUnqualifiedId(const UnqualifiedId &Id,
1339 TemplateArgumentListInfo &Buffer,
1340 DeclarationNameInfo &NameInfo,
1341 const TemplateArgumentListInfo *&TemplateArgs) {
John McCall129e2df2009-11-30 22:42:35 +00001342 if (Id.getKind() == UnqualifiedId::IK_TemplateId) {
1343 Buffer.setLAngleLoc(Id.TemplateId->LAngleLoc);
1344 Buffer.setRAngleLoc(Id.TemplateId->RAngleLoc);
1345
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00001346 ASTTemplateArgsPtr TemplateArgsPtr(*this,
John McCall129e2df2009-11-30 22:42:35 +00001347 Id.TemplateId->getTemplateArgs(),
1348 Id.TemplateId->NumArgs);
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00001349 translateTemplateArguments(TemplateArgsPtr, Buffer);
John McCall129e2df2009-11-30 22:42:35 +00001350 TemplateArgsPtr.release();
1351
John McCall2b5289b2010-08-23 07:28:44 +00001352 TemplateName TName = Id.TemplateId->Template.get();
Abramo Bagnara25777432010-08-11 22:01:17 +00001353 SourceLocation TNameLoc = Id.TemplateId->TemplateNameLoc;
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00001354 NameInfo = Context.getNameForTemplate(TName, TNameLoc);
John McCall129e2df2009-11-30 22:42:35 +00001355 TemplateArgs = &Buffer;
1356 } else {
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00001357 NameInfo = GetNameFromUnqualifiedId(Id);
John McCall129e2df2009-11-30 22:42:35 +00001358 TemplateArgs = 0;
1359 }
1360}
1361
John McCall578b69b2009-12-16 08:11:27 +00001362/// Diagnose an empty lookup.
1363///
1364/// \return false if new lookup candidates were found
Nick Lewycky03d98c52010-07-06 19:51:49 +00001365bool Sema::DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R,
Kaelyn Uhrainace5e762011-08-05 00:09:52 +00001366 CorrectTypoContext CTC,
1367 TemplateArgumentListInfo *ExplicitTemplateArgs,
1368 Expr **Args, unsigned NumArgs) {
John McCall578b69b2009-12-16 08:11:27 +00001369 DeclarationName Name = R.getLookupName();
1370
John McCall578b69b2009-12-16 08:11:27 +00001371 unsigned diagnostic = diag::err_undeclared_var_use;
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001372 unsigned diagnostic_suggest = diag::err_undeclared_var_use_suggest;
John McCall578b69b2009-12-16 08:11:27 +00001373 if (Name.getNameKind() == DeclarationName::CXXOperatorName ||
1374 Name.getNameKind() == DeclarationName::CXXLiteralOperatorName ||
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001375 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
John McCall578b69b2009-12-16 08:11:27 +00001376 diagnostic = diag::err_undeclared_use;
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001377 diagnostic_suggest = diag::err_undeclared_use_suggest;
1378 }
John McCall578b69b2009-12-16 08:11:27 +00001379
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001380 // If the original lookup was an unqualified lookup, fake an
1381 // unqualified lookup. This is useful when (for example) the
1382 // original lookup would not have found something because it was a
1383 // dependent name.
Nick Lewycky03d98c52010-07-06 19:51:49 +00001384 for (DeclContext *DC = SS.isEmpty() ? CurContext : 0;
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001385 DC; DC = DC->getParent()) {
John McCall578b69b2009-12-16 08:11:27 +00001386 if (isa<CXXRecordDecl>(DC)) {
1387 LookupQualifiedName(R, DC);
1388
1389 if (!R.empty()) {
1390 // Don't give errors about ambiguities in this lookup.
1391 R.suppressDiagnostics();
1392
1393 CXXMethodDecl *CurMethod = dyn_cast<CXXMethodDecl>(CurContext);
1394 bool isInstance = CurMethod &&
1395 CurMethod->isInstance() &&
1396 DC == CurMethod->getParent();
1397
1398 // Give a code modification hint to insert 'this->'.
1399 // TODO: fixit for inserting 'Base<T>::' in the other cases.
1400 // Actually quite difficult!
Nick Lewycky03d98c52010-07-06 19:51:49 +00001401 if (isInstance) {
Nick Lewycky03d98c52010-07-06 19:51:49 +00001402 UnresolvedLookupExpr *ULE = cast<UnresolvedLookupExpr>(
1403 CallsUndergoingInstantiation.back()->getCallee());
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001404 CXXMethodDecl *DepMethod = cast_or_null<CXXMethodDecl>(
Nick Lewycky03d98c52010-07-06 19:51:49 +00001405 CurMethod->getInstantiatedFromMemberFunction());
Eli Friedmana7e68452010-08-22 01:00:03 +00001406 if (DepMethod) {
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001407 Diag(R.getNameLoc(), diagnostic) << Name
1408 << FixItHint::CreateInsertion(R.getNameLoc(), "this->");
1409 QualType DepThisType = DepMethod->getThisType(Context);
1410 CXXThisExpr *DepThis = new (Context) CXXThisExpr(
1411 R.getNameLoc(), DepThisType, false);
1412 TemplateArgumentListInfo TList;
1413 if (ULE->hasExplicitTemplateArgs())
1414 ULE->copyTemplateArgumentsInto(TList);
Douglas Gregor7c3179c2011-02-28 18:50:33 +00001415
Douglas Gregor7c3179c2011-02-28 18:50:33 +00001416 CXXScopeSpec SS;
Douglas Gregor4c9be892011-02-28 20:01:57 +00001417 SS.Adopt(ULE->getQualifierLoc());
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001418 CXXDependentScopeMemberExpr *DepExpr =
1419 CXXDependentScopeMemberExpr::Create(
1420 Context, DepThis, DepThisType, true, SourceLocation(),
Douglas Gregor7c3179c2011-02-28 18:50:33 +00001421 SS.getWithLocInContext(Context), NULL,
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001422 R.getLookupNameInfo(), &TList);
1423 CallsUndergoingInstantiation.back()->setCallee(DepExpr);
Eli Friedmana7e68452010-08-22 01:00:03 +00001424 } else {
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001425 // FIXME: we should be able to handle this case too. It is correct
1426 // to add this-> here. This is a workaround for PR7947.
1427 Diag(R.getNameLoc(), diagnostic) << Name;
Eli Friedmana7e68452010-08-22 01:00:03 +00001428 }
Nick Lewycky03d98c52010-07-06 19:51:49 +00001429 } else {
John McCall578b69b2009-12-16 08:11:27 +00001430 Diag(R.getNameLoc(), diagnostic) << Name;
Nick Lewycky03d98c52010-07-06 19:51:49 +00001431 }
John McCall578b69b2009-12-16 08:11:27 +00001432
1433 // Do we really want to note all of these?
1434 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
1435 Diag((*I)->getLocation(), diag::note_dependent_var_use);
1436
1437 // Tell the callee to try to recover.
1438 return false;
1439 }
Douglas Gregore26f0432010-08-09 22:38:14 +00001440
1441 R.clear();
John McCall578b69b2009-12-16 08:11:27 +00001442 }
1443 }
1444
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001445 // We didn't find anything, so try to correct for a typo.
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001446 TypoCorrection Corrected;
1447 if (S && (Corrected = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(),
1448 S, &SS, NULL, false, CTC))) {
1449 std::string CorrectedStr(Corrected.getAsString(getLangOptions()));
1450 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions()));
1451 R.setLookupName(Corrected.getCorrection());
1452
Hans Wennborg701d1e72011-07-12 08:45:31 +00001453 if (NamedDecl *ND = Corrected.getCorrectionDecl()) {
Kaelyn Uhrainf0c1d8f2011-08-03 20:36:05 +00001454 if (Corrected.isOverloaded()) {
1455 OverloadCandidateSet OCS(R.getNameLoc());
1456 OverloadCandidateSet::iterator Best;
1457 for (TypoCorrection::decl_iterator CD = Corrected.begin(),
1458 CDEnd = Corrected.end();
1459 CD != CDEnd; ++CD) {
1460 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*CD))
Kaelyn Uhrainace5e762011-08-05 00:09:52 +00001461 AddOverloadCandidate(FD, DeclAccessPair::make(FD, AS_none),
Kaelyn Uhrainf0c1d8f2011-08-03 20:36:05 +00001462 Args, NumArgs, OCS);
Kaelyn Uhrainace5e762011-08-05 00:09:52 +00001463 else if (FunctionTemplateDecl *FTD =
1464 dyn_cast<FunctionTemplateDecl>(*CD))
1465 AddTemplateOverloadCandidate(
1466 FTD, DeclAccessPair::make(FTD, AS_none), ExplicitTemplateArgs,
1467 Args, NumArgs, OCS);
Kaelyn Uhrainf0c1d8f2011-08-03 20:36:05 +00001468 }
1469 switch (OCS.BestViableFunction(*this, R.getNameLoc(), Best)) {
1470 case OR_Success:
1471 ND = Best->Function;
1472 break;
1473 default:
Kaelyn Uhrain844d5722011-08-04 23:30:54 +00001474 break;
Kaelyn Uhrainf0c1d8f2011-08-03 20:36:05 +00001475 }
1476 }
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001477 R.addDecl(ND);
1478 if (isa<ValueDecl>(ND) || isa<FunctionTemplateDecl>(ND)) {
Douglas Gregoraaf87162010-04-14 20:04:41 +00001479 if (SS.isEmpty())
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001480 Diag(R.getNameLoc(), diagnostic_suggest) << Name << CorrectedQuotedStr
1481 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr);
Douglas Gregoraaf87162010-04-14 20:04:41 +00001482 else
1483 Diag(R.getNameLoc(), diag::err_no_member_suggest)
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001484 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr
Douglas Gregoraaf87162010-04-14 20:04:41 +00001485 << SS.getRange()
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001486 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr);
1487 if (ND)
Douglas Gregoraaf87162010-04-14 20:04:41 +00001488 Diag(ND->getLocation(), diag::note_previous_decl)
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001489 << CorrectedQuotedStr;
Douglas Gregoraaf87162010-04-14 20:04:41 +00001490
1491 // Tell the callee to try to recover.
1492 return false;
1493 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00001494
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001495 if (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND)) {
Douglas Gregoraaf87162010-04-14 20:04:41 +00001496 // FIXME: If we ended up with a typo for a type name or
1497 // Objective-C class name, we're in trouble because the parser
1498 // is in the wrong place to recover. Suggest the typo
1499 // correction, but don't make it a fix-it since we're not going
1500 // to recover well anyway.
1501 if (SS.isEmpty())
Richard Trieu67e29332011-08-02 04:35:43 +00001502 Diag(R.getNameLoc(), diagnostic_suggest)
1503 << Name << CorrectedQuotedStr;
Douglas Gregoraaf87162010-04-14 20:04:41 +00001504 else
1505 Diag(R.getNameLoc(), diag::err_no_member_suggest)
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001506 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr
Douglas Gregoraaf87162010-04-14 20:04:41 +00001507 << SS.getRange();
1508
1509 // Don't try to recover; it won't work.
1510 return true;
1511 }
1512 } else {
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00001513 // FIXME: We found a keyword. Suggest it, but don't provide a fix-it
Douglas Gregoraaf87162010-04-14 20:04:41 +00001514 // because we aren't able to recover.
Douglas Gregord203a162010-01-01 00:15:04 +00001515 if (SS.isEmpty())
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001516 Diag(R.getNameLoc(), diagnostic_suggest) << Name << CorrectedQuotedStr;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001517 else
Douglas Gregord203a162010-01-01 00:15:04 +00001518 Diag(R.getNameLoc(), diag::err_no_member_suggest)
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001519 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr
Douglas Gregoraaf87162010-04-14 20:04:41 +00001520 << SS.getRange();
Douglas Gregord203a162010-01-01 00:15:04 +00001521 return true;
1522 }
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001523 }
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001524 R.clear();
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001525
1526 // Emit a special diagnostic for failed member lookups.
1527 // FIXME: computing the declaration context might fail here (?)
1528 if (!SS.isEmpty()) {
1529 Diag(R.getNameLoc(), diag::err_no_member)
1530 << Name << computeDeclContext(SS, false)
1531 << SS.getRange();
1532 return true;
1533 }
1534
John McCall578b69b2009-12-16 08:11:27 +00001535 // Give up, we can't recover.
1536 Diag(R.getNameLoc(), diagnostic) << Name;
1537 return true;
1538}
1539
Douglas Gregorca45da02010-11-02 20:36:02 +00001540ObjCPropertyDecl *Sema::canSynthesizeProvisionalIvar(IdentifierInfo *II) {
1541 ObjCMethodDecl *CurMeth = getCurMethodDecl();
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001542 ObjCInterfaceDecl *IDecl = CurMeth->getClassInterface();
1543 if (!IDecl)
1544 return 0;
1545 ObjCImplementationDecl *ClassImpDecl = IDecl->getImplementation();
1546 if (!ClassImpDecl)
1547 return 0;
Douglas Gregorca45da02010-11-02 20:36:02 +00001548 ObjCPropertyDecl *property = LookupPropertyDecl(IDecl, II);
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001549 if (!property)
1550 return 0;
1551 if (ObjCPropertyImplDecl *PIDecl = ClassImpDecl->FindPropertyImplDecl(II))
Douglas Gregorca45da02010-11-02 20:36:02 +00001552 if (PIDecl->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic ||
1553 PIDecl->getPropertyIvarDecl())
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001554 return 0;
1555 return property;
1556}
1557
Douglas Gregorca45da02010-11-02 20:36:02 +00001558bool Sema::canSynthesizeProvisionalIvar(ObjCPropertyDecl *Property) {
1559 ObjCMethodDecl *CurMeth = getCurMethodDecl();
1560 ObjCInterfaceDecl *IDecl = CurMeth->getClassInterface();
1561 if (!IDecl)
1562 return false;
1563 ObjCImplementationDecl *ClassImpDecl = IDecl->getImplementation();
1564 if (!ClassImpDecl)
1565 return false;
1566 if (ObjCPropertyImplDecl *PIDecl
1567 = ClassImpDecl->FindPropertyImplDecl(Property->getIdentifier()))
1568 if (PIDecl->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic ||
1569 PIDecl->getPropertyIvarDecl())
1570 return false;
1571
1572 return true;
1573}
1574
Douglas Gregor312eadb2011-04-24 05:37:28 +00001575ObjCIvarDecl *Sema::SynthesizeProvisionalIvar(LookupResult &Lookup,
1576 IdentifierInfo *II,
1577 SourceLocation NameLoc) {
1578 ObjCMethodDecl *CurMeth = getCurMethodDecl();
Fariborz Jahanian73f666f2010-07-30 16:59:05 +00001579 bool LookForIvars;
1580 if (Lookup.empty())
1581 LookForIvars = true;
1582 else if (CurMeth->isClassMethod())
1583 LookForIvars = false;
1584 else
1585 LookForIvars = (Lookup.isSingleResult() &&
Fariborz Jahaniand0fbadd2011-01-26 00:57:01 +00001586 Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod() &&
1587 (Lookup.getAsSingle<VarDecl>() != 0));
Fariborz Jahanian73f666f2010-07-30 16:59:05 +00001588 if (!LookForIvars)
1589 return 0;
1590
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001591 ObjCInterfaceDecl *IDecl = CurMeth->getClassInterface();
1592 if (!IDecl)
1593 return 0;
1594 ObjCImplementationDecl *ClassImpDecl = IDecl->getImplementation();
Fariborz Jahanian84ef4b22010-07-19 16:14:33 +00001595 if (!ClassImpDecl)
1596 return 0;
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001597 bool DynamicImplSeen = false;
Douglas Gregor312eadb2011-04-24 05:37:28 +00001598 ObjCPropertyDecl *property = LookupPropertyDecl(IDecl, II);
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001599 if (!property)
1600 return 0;
Fariborz Jahanian43e1b462010-10-19 19:08:23 +00001601 if (ObjCPropertyImplDecl *PIDecl = ClassImpDecl->FindPropertyImplDecl(II)) {
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001602 DynamicImplSeen =
1603 (PIDecl->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic);
Fariborz Jahanian43e1b462010-10-19 19:08:23 +00001604 // property implementation has a designated ivar. No need to assume a new
1605 // one.
1606 if (!DynamicImplSeen && PIDecl->getPropertyIvarDecl())
1607 return 0;
1608 }
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001609 if (!DynamicImplSeen) {
Douglas Gregor312eadb2011-04-24 05:37:28 +00001610 QualType PropType = Context.getCanonicalType(property->getType());
1611 ObjCIvarDecl *Ivar = ObjCIvarDecl::Create(Context, ClassImpDecl,
Abramo Bagnaraff676cb2011-03-08 08:55:46 +00001612 NameLoc, NameLoc,
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001613 II, PropType, /*Dinfo=*/0,
Fariborz Jahanian75049662010-12-15 23:29:04 +00001614 ObjCIvarDecl::Private,
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001615 (Expr *)0, true);
1616 ClassImpDecl->addDecl(Ivar);
1617 IDecl->makeDeclVisibleInContext(Ivar, false);
1618 property->setPropertyIvarDecl(Ivar);
1619 return Ivar;
1620 }
1621 return 0;
1622}
1623
John McCall60d7b3a2010-08-24 06:29:42 +00001624ExprResult Sema::ActOnIdExpression(Scope *S,
John McCallfb97e752010-08-24 22:52:39 +00001625 CXXScopeSpec &SS,
1626 UnqualifiedId &Id,
1627 bool HasTrailingLParen,
1628 bool isAddressOfOperand) {
John McCallf7a1a742009-11-24 19:00:30 +00001629 assert(!(isAddressOfOperand && HasTrailingLParen) &&
1630 "cannot be direct & operand and have a trailing lparen");
1631
1632 if (SS.isInvalid())
Douglas Gregor4c921ae2009-01-30 01:04:22 +00001633 return ExprError();
Douglas Gregor5953d8b2009-03-19 17:26:29 +00001634
John McCall129e2df2009-11-30 22:42:35 +00001635 TemplateArgumentListInfo TemplateArgsBuffer;
John McCallf7a1a742009-11-24 19:00:30 +00001636
1637 // Decompose the UnqualifiedId into the following data.
Abramo Bagnara25777432010-08-11 22:01:17 +00001638 DeclarationNameInfo NameInfo;
John McCallf7a1a742009-11-24 19:00:30 +00001639 const TemplateArgumentListInfo *TemplateArgs;
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00001640 DecomposeUnqualifiedId(Id, TemplateArgsBuffer, NameInfo, TemplateArgs);
Douglas Gregor5953d8b2009-03-19 17:26:29 +00001641
Abramo Bagnara25777432010-08-11 22:01:17 +00001642 DeclarationName Name = NameInfo.getName();
Douglas Gregor10c42622008-11-18 15:03:34 +00001643 IdentifierInfo *II = Name.getAsIdentifierInfo();
Abramo Bagnara25777432010-08-11 22:01:17 +00001644 SourceLocation NameLoc = NameInfo.getLoc();
John McCallba135432009-11-21 08:51:07 +00001645
John McCallf7a1a742009-11-24 19:00:30 +00001646 // C++ [temp.dep.expr]p3:
1647 // An id-expression is type-dependent if it contains:
Douglas Gregor48026d22010-01-11 18:40:55 +00001648 // -- an identifier that was declared with a dependent type,
1649 // (note: handled after lookup)
1650 // -- a template-id that is dependent,
1651 // (note: handled in BuildTemplateIdExpr)
1652 // -- a conversion-function-id that specifies a dependent type,
John McCallf7a1a742009-11-24 19:00:30 +00001653 // -- a nested-name-specifier that contains a class-name that
1654 // names a dependent type.
1655 // Determine whether this is a member of an unknown specialization;
1656 // we need to handle these differently.
Eli Friedman647c8b32010-08-06 23:41:47 +00001657 bool DependentID = false;
1658 if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName &&
1659 Name.getCXXNameType()->isDependentType()) {
1660 DependentID = true;
1661 } else if (SS.isSet()) {
Chris Lattner337e5502011-02-18 01:27:55 +00001662 if (DeclContext *DC = computeDeclContext(SS, false)) {
Eli Friedman647c8b32010-08-06 23:41:47 +00001663 if (RequireCompleteDeclContext(SS, DC))
1664 return ExprError();
Eli Friedman647c8b32010-08-06 23:41:47 +00001665 } else {
1666 DependentID = true;
1667 }
1668 }
1669
Chris Lattner337e5502011-02-18 01:27:55 +00001670 if (DependentID)
Abramo Bagnara25777432010-08-11 22:01:17 +00001671 return ActOnDependentIdExpression(SS, NameInfo, isAddressOfOperand,
John McCallf7a1a742009-11-24 19:00:30 +00001672 TemplateArgs);
Chris Lattner337e5502011-02-18 01:27:55 +00001673
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001674 bool IvarLookupFollowUp = false;
John McCallf7a1a742009-11-24 19:00:30 +00001675 // Perform the required lookup.
Fariborz Jahanian98a54032011-07-12 17:16:56 +00001676 LookupResult R(*this, NameInfo,
1677 (Id.getKind() == UnqualifiedId::IK_ImplicitSelfParam)
1678 ? LookupObjCImplicitSelfParam : LookupOrdinaryName);
John McCallf7a1a742009-11-24 19:00:30 +00001679 if (TemplateArgs) {
Douglas Gregord2235f62010-05-20 20:58:56 +00001680 // Lookup the template name again to correctly establish the context in
1681 // which it was found. This is really unfortunate as we already did the
1682 // lookup to determine that it was a template name in the first place. If
1683 // this becomes a performance hit, we can work harder to preserve those
1684 // results until we get here but it's likely not worth it.
Douglas Gregor1fd6d442010-05-21 23:18:07 +00001685 bool MemberOfUnknownSpecialization;
1686 LookupTemplateName(R, S, SS, QualType(), /*EnteringContext=*/false,
1687 MemberOfUnknownSpecialization);
Douglas Gregor2f9f89c2011-02-04 13:35:07 +00001688
1689 if (MemberOfUnknownSpecialization ||
1690 (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation))
1691 return ActOnDependentIdExpression(SS, NameInfo, isAddressOfOperand,
1692 TemplateArgs);
John McCallf7a1a742009-11-24 19:00:30 +00001693 } else {
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001694 IvarLookupFollowUp = (!SS.isSet() && II && getCurMethodDecl());
Fariborz Jahanian48c2d562010-01-12 23:58:59 +00001695 LookupParsedName(R, S, &SS, !IvarLookupFollowUp);
Mike Stump1eb44332009-09-09 15:08:12 +00001696
Douglas Gregor2f9f89c2011-02-04 13:35:07 +00001697 // If the result might be in a dependent base class, this is a dependent
1698 // id-expression.
1699 if (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation)
1700 return ActOnDependentIdExpression(SS, NameInfo, isAddressOfOperand,
1701 TemplateArgs);
1702
John McCallf7a1a742009-11-24 19:00:30 +00001703 // If this reference is in an Objective-C method, then we need to do
1704 // some special Objective-C lookup, too.
Fariborz Jahanian48c2d562010-01-12 23:58:59 +00001705 if (IvarLookupFollowUp) {
John McCall60d7b3a2010-08-24 06:29:42 +00001706 ExprResult E(LookupInObjCMethod(R, S, II, true));
John McCallf7a1a742009-11-24 19:00:30 +00001707 if (E.isInvalid())
1708 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00001709
Chris Lattner337e5502011-02-18 01:27:55 +00001710 if (Expr *Ex = E.takeAs<Expr>())
1711 return Owned(Ex);
1712
1713 // Synthesize ivars lazily.
Fariborz Jahaniane776f882011-01-03 18:08:02 +00001714 if (getLangOptions().ObjCDefaultSynthProperties &&
1715 getLangOptions().ObjCNonFragileABI2) {
Douglas Gregor312eadb2011-04-24 05:37:28 +00001716 if (SynthesizeProvisionalIvar(R, II, NameLoc)) {
Fariborz Jahaniande267602010-11-17 19:41:23 +00001717 if (const ObjCPropertyDecl *Property =
1718 canSynthesizeProvisionalIvar(II)) {
1719 Diag(NameLoc, diag::warn_synthesized_ivar_access) << II;
1720 Diag(Property->getLocation(), diag::note_property_declare);
1721 }
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001722 return ActOnIdExpression(S, SS, Id, HasTrailingLParen,
1723 isAddressOfOperand);
Fariborz Jahaniande267602010-11-17 19:41:23 +00001724 }
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001725 }
Fariborz Jahanianf759b4d2010-08-13 18:09:39 +00001726 // for further use, this must be set to false if in class method.
1727 IvarLookupFollowUp = getCurMethodDecl()->isInstanceMethod();
Steve Naroffe3e9add2008-06-02 23:03:37 +00001728 }
Chris Lattner8a934232008-03-31 00:36:02 +00001729 }
Douglas Gregorc71e28c2009-02-16 19:28:42 +00001730
John McCallf7a1a742009-11-24 19:00:30 +00001731 if (R.isAmbiguous())
1732 return ExprError();
1733
Douglas Gregor48f3bb92009-02-18 21:56:37 +00001734 // Determine whether this name might be a candidate for
1735 // argument-dependent lookup.
John McCallf7a1a742009-11-24 19:00:30 +00001736 bool ADL = UseArgumentDependentLookup(SS, R, HasTrailingLParen);
Douglas Gregor48f3bb92009-02-18 21:56:37 +00001737
John McCallf7a1a742009-11-24 19:00:30 +00001738 if (R.empty() && !ADL) {
Reid Spencer5f016e22007-07-11 17:01:13 +00001739 // Otherwise, this could be an implicitly declared function reference (legal
John McCallf7a1a742009-11-24 19:00:30 +00001740 // in C90, extension in C99, forbidden in C++).
1741 if (HasTrailingLParen && II && !getLangOptions().CPlusPlus) {
1742 NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *II, S);
1743 if (D) R.addDecl(D);
1744 }
1745
1746 // If this name wasn't predeclared and if this is not a function
1747 // call, diagnose the problem.
1748 if (R.empty()) {
Douglas Gregor91f7ac72010-05-18 16:14:23 +00001749 if (DiagnoseEmptyLookup(S, SS, R, CTC_Unknown))
John McCall578b69b2009-12-16 08:11:27 +00001750 return ExprError();
1751
1752 assert(!R.empty() &&
1753 "DiagnoseEmptyLookup returned false but added no results");
Douglas Gregorf06cdae2010-01-03 18:01:57 +00001754
1755 // If we found an Objective-C instance variable, let
1756 // LookupInObjCMethod build the appropriate expression to
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001757 // reference the ivar.
Douglas Gregorf06cdae2010-01-03 18:01:57 +00001758 if (ObjCIvarDecl *Ivar = R.getAsSingle<ObjCIvarDecl>()) {
1759 R.clear();
John McCall60d7b3a2010-08-24 06:29:42 +00001760 ExprResult E(LookupInObjCMethod(R, S, Ivar->getIdentifier()));
Douglas Gregorf06cdae2010-01-03 18:01:57 +00001761 assert(E.isInvalid() || E.get());
1762 return move(E);
1763 }
Reid Spencer5f016e22007-07-11 17:01:13 +00001764 }
1765 }
Mike Stump1eb44332009-09-09 15:08:12 +00001766
John McCallf7a1a742009-11-24 19:00:30 +00001767 // This is guaranteed from this point on.
1768 assert(!R.empty() || ADL);
1769
John McCallaa81e162009-12-01 22:10:20 +00001770 // Check whether this might be a C++ implicit instance member access.
John McCallfb97e752010-08-24 22:52:39 +00001771 // C++ [class.mfct.non-static]p3:
1772 // When an id-expression that is not part of a class member access
1773 // syntax and not used to form a pointer to member is used in the
1774 // body of a non-static member function of class X, if name lookup
1775 // resolves the name in the id-expression to a non-static non-type
1776 // member of some class C, the id-expression is transformed into a
1777 // class member access expression using (*this) as the
1778 // postfix-expression to the left of the . operator.
John McCall9c72c602010-08-27 09:08:28 +00001779 //
1780 // But we don't actually need to do this for '&' operands if R
1781 // resolved to a function or overloaded function set, because the
1782 // expression is ill-formed if it actually works out to be a
1783 // non-static member function:
1784 //
1785 // C++ [expr.ref]p4:
1786 // Otherwise, if E1.E2 refers to a non-static member function. . .
1787 // [t]he expression can be used only as the left-hand operand of a
1788 // member function call.
1789 //
1790 // There are other safeguards against such uses, but it's important
1791 // to get this right here so that we don't end up making a
1792 // spuriously dependent expression if we're inside a dependent
1793 // instance method.
John McCall3b4294e2009-12-16 12:17:52 +00001794 if (!R.empty() && (*R.begin())->isCXXClassMember()) {
John McCall9c72c602010-08-27 09:08:28 +00001795 bool MightBeImplicitMember;
1796 if (!isAddressOfOperand)
1797 MightBeImplicitMember = true;
1798 else if (!SS.isEmpty())
1799 MightBeImplicitMember = false;
1800 else if (R.isOverloadedResult())
1801 MightBeImplicitMember = false;
Douglas Gregore2248be2010-08-30 16:00:47 +00001802 else if (R.isUnresolvableResult())
1803 MightBeImplicitMember = true;
John McCall9c72c602010-08-27 09:08:28 +00001804 else
Francois Pichet87c2e122010-11-21 06:08:52 +00001805 MightBeImplicitMember = isa<FieldDecl>(R.getFoundDecl()) ||
1806 isa<IndirectFieldDecl>(R.getFoundDecl());
John McCall9c72c602010-08-27 09:08:28 +00001807
1808 if (MightBeImplicitMember)
John McCall3b4294e2009-12-16 12:17:52 +00001809 return BuildPossibleImplicitMemberExpr(SS, R, TemplateArgs);
John McCall5b3f9132009-11-22 01:44:31 +00001810 }
1811
John McCallf7a1a742009-11-24 19:00:30 +00001812 if (TemplateArgs)
1813 return BuildTemplateIdExpr(SS, R, ADL, *TemplateArgs);
John McCall5b3f9132009-11-22 01:44:31 +00001814
John McCallf7a1a742009-11-24 19:00:30 +00001815 return BuildDeclarationNameExpr(SS, R, ADL);
1816}
1817
John McCall129e2df2009-11-30 22:42:35 +00001818/// BuildQualifiedDeclarationNameExpr - Build a C++ qualified
1819/// declaration name, generally during template instantiation.
1820/// There's a large number of things which don't need to be done along
1821/// this path.
John McCall60d7b3a2010-08-24 06:29:42 +00001822ExprResult
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00001823Sema::BuildQualifiedDeclarationNameExpr(CXXScopeSpec &SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00001824 const DeclarationNameInfo &NameInfo) {
John McCallf7a1a742009-11-24 19:00:30 +00001825 DeclContext *DC;
Douglas Gregore6ec5c42010-04-28 07:04:26 +00001826 if (!(DC = computeDeclContext(SS, false)) || DC->isDependentContext())
Abramo Bagnara25777432010-08-11 22:01:17 +00001827 return BuildDependentDeclRefExpr(SS, NameInfo, 0);
John McCallf7a1a742009-11-24 19:00:30 +00001828
John McCall77bb1aa2010-05-01 00:40:08 +00001829 if (RequireCompleteDeclContext(SS, DC))
Douglas Gregore6ec5c42010-04-28 07:04:26 +00001830 return ExprError();
1831
Abramo Bagnara25777432010-08-11 22:01:17 +00001832 LookupResult R(*this, NameInfo, LookupOrdinaryName);
John McCallf7a1a742009-11-24 19:00:30 +00001833 LookupQualifiedName(R, DC);
1834
1835 if (R.isAmbiguous())
1836 return ExprError();
1837
1838 if (R.empty()) {
Abramo Bagnara25777432010-08-11 22:01:17 +00001839 Diag(NameInfo.getLoc(), diag::err_no_member)
1840 << NameInfo.getName() << DC << SS.getRange();
John McCallf7a1a742009-11-24 19:00:30 +00001841 return ExprError();
1842 }
1843
1844 return BuildDeclarationNameExpr(SS, R, /*ADL*/ false);
1845}
1846
1847/// LookupInObjCMethod - The parser has read a name in, and Sema has
1848/// detected that we're currently inside an ObjC method. Perform some
1849/// additional lookup.
1850///
1851/// Ideally, most of this would be done by lookup, but there's
1852/// actually quite a lot of extra work involved.
1853///
1854/// Returns a null sentinel to indicate trivial success.
John McCall60d7b3a2010-08-24 06:29:42 +00001855ExprResult
John McCallf7a1a742009-11-24 19:00:30 +00001856Sema::LookupInObjCMethod(LookupResult &Lookup, Scope *S,
Chris Lattnereb483eb2010-04-11 08:28:14 +00001857 IdentifierInfo *II, bool AllowBuiltinCreation) {
John McCallf7a1a742009-11-24 19:00:30 +00001858 SourceLocation Loc = Lookup.getNameLoc();
Chris Lattneraec43db2010-04-12 05:10:17 +00001859 ObjCMethodDecl *CurMethod = getCurMethodDecl();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00001860
John McCallf7a1a742009-11-24 19:00:30 +00001861 // There are two cases to handle here. 1) scoped lookup could have failed,
1862 // in which case we should look for an ivar. 2) scoped lookup could have
1863 // found a decl, but that decl is outside the current instance method (i.e.
1864 // a global variable). In these two cases, we do a lookup for an ivar with
1865 // this name, if the lookup sucedes, we replace it our current decl.
1866
1867 // If we're in a class method, we don't normally want to look for
1868 // ivars. But if we don't find anything else, and there's an
1869 // ivar, that's an error.
Chris Lattneraec43db2010-04-12 05:10:17 +00001870 bool IsClassMethod = CurMethod->isClassMethod();
John McCallf7a1a742009-11-24 19:00:30 +00001871
1872 bool LookForIvars;
1873 if (Lookup.empty())
1874 LookForIvars = true;
1875 else if (IsClassMethod)
1876 LookForIvars = false;
1877 else
1878 LookForIvars = (Lookup.isSingleResult() &&
1879 Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod());
Fariborz Jahanian412e7982010-02-09 19:31:38 +00001880 ObjCInterfaceDecl *IFace = 0;
John McCallf7a1a742009-11-24 19:00:30 +00001881 if (LookForIvars) {
Chris Lattneraec43db2010-04-12 05:10:17 +00001882 IFace = CurMethod->getClassInterface();
John McCallf7a1a742009-11-24 19:00:30 +00001883 ObjCInterfaceDecl *ClassDeclared;
1884 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) {
1885 // Diagnose using an ivar in a class method.
1886 if (IsClassMethod)
1887 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method)
1888 << IV->getDeclName());
1889
1890 // If we're referencing an invalid decl, just return this as a silent
1891 // error node. The error diagnostic was already emitted on the decl.
1892 if (IV->isInvalidDecl())
1893 return ExprError();
1894
1895 // Check if referencing a field with __attribute__((deprecated)).
1896 if (DiagnoseUseOfDecl(IV, Loc))
1897 return ExprError();
1898
1899 // Diagnose the use of an ivar outside of the declaring class.
1900 if (IV->getAccessControl() == ObjCIvarDecl::Private &&
1901 ClassDeclared != IFace)
1902 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName();
1903
1904 // FIXME: This should use a new expr for a direct reference, don't
1905 // turn this into Self->ivar, just return a BareIVarExpr or something.
1906 IdentifierInfo &II = Context.Idents.get("self");
1907 UnqualifiedId SelfName;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001908 SelfName.setIdentifier(&II, SourceLocation());
Fariborz Jahanian98a54032011-07-12 17:16:56 +00001909 SelfName.setKind(UnqualifiedId::IK_ImplicitSelfParam);
John McCallf7a1a742009-11-24 19:00:30 +00001910 CXXScopeSpec SelfScopeSpec;
John McCall60d7b3a2010-08-24 06:29:42 +00001911 ExprResult SelfExpr = ActOnIdExpression(S, SelfScopeSpec,
Douglas Gregore45bb6a2010-09-22 16:33:13 +00001912 SelfName, false, false);
1913 if (SelfExpr.isInvalid())
1914 return ExprError();
1915
John Wiegley429bb272011-04-08 18:41:53 +00001916 SelfExpr = DefaultLvalueConversion(SelfExpr.take());
1917 if (SelfExpr.isInvalid())
1918 return ExprError();
John McCall409fa9a2010-12-06 20:48:59 +00001919
John McCallf7a1a742009-11-24 19:00:30 +00001920 MarkDeclarationReferenced(Loc, IV);
1921 return Owned(new (Context)
1922 ObjCIvarRefExpr(IV, IV->getType(), Loc,
John Wiegley429bb272011-04-08 18:41:53 +00001923 SelfExpr.take(), true, true));
John McCallf7a1a742009-11-24 19:00:30 +00001924 }
Chris Lattneraec43db2010-04-12 05:10:17 +00001925 } else if (CurMethod->isInstanceMethod()) {
John McCallf7a1a742009-11-24 19:00:30 +00001926 // We should warn if a local variable hides an ivar.
Chris Lattneraec43db2010-04-12 05:10:17 +00001927 ObjCInterfaceDecl *IFace = CurMethod->getClassInterface();
John McCallf7a1a742009-11-24 19:00:30 +00001928 ObjCInterfaceDecl *ClassDeclared;
1929 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) {
1930 if (IV->getAccessControl() != ObjCIvarDecl::Private ||
1931 IFace == ClassDeclared)
1932 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName();
1933 }
1934 }
1935
Fariborz Jahanian48c2d562010-01-12 23:58:59 +00001936 if (Lookup.empty() && II && AllowBuiltinCreation) {
1937 // FIXME. Consolidate this with similar code in LookupName.
1938 if (unsigned BuiltinID = II->getBuiltinID()) {
1939 if (!(getLangOptions().CPlusPlus &&
1940 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))) {
1941 NamedDecl *D = LazilyCreateBuiltin((IdentifierInfo *)II, BuiltinID,
1942 S, Lookup.isForRedeclaration(),
1943 Lookup.getNameLoc());
1944 if (D) Lookup.addDecl(D);
1945 }
1946 }
1947 }
John McCallf7a1a742009-11-24 19:00:30 +00001948 // Sentinel value saying that we didn't do anything special.
1949 return Owned((Expr*) 0);
Douglas Gregor751f9a42009-06-30 15:47:41 +00001950}
John McCallba135432009-11-21 08:51:07 +00001951
John McCall6bb80172010-03-30 21:47:33 +00001952/// \brief Cast a base object to a member's actual type.
1953///
1954/// Logically this happens in three phases:
1955///
1956/// * First we cast from the base type to the naming class.
1957/// The naming class is the class into which we were looking
1958/// when we found the member; it's the qualifier type if a
1959/// qualifier was provided, and otherwise it's the base type.
1960///
1961/// * Next we cast from the naming class to the declaring class.
1962/// If the member we found was brought into a class's scope by
1963/// a using declaration, this is that class; otherwise it's
1964/// the class declaring the member.
1965///
1966/// * Finally we cast from the declaring class to the "true"
1967/// declaring class of the member. This conversion does not
1968/// obey access control.
John Wiegley429bb272011-04-08 18:41:53 +00001969ExprResult
1970Sema::PerformObjectMemberConversion(Expr *From,
Douglas Gregor5fccd362010-03-03 23:55:11 +00001971 NestedNameSpecifier *Qualifier,
John McCall6bb80172010-03-30 21:47:33 +00001972 NamedDecl *FoundDecl,
Douglas Gregor5fccd362010-03-03 23:55:11 +00001973 NamedDecl *Member) {
1974 CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Member->getDeclContext());
1975 if (!RD)
John Wiegley429bb272011-04-08 18:41:53 +00001976 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001977
Douglas Gregor5fccd362010-03-03 23:55:11 +00001978 QualType DestRecordType;
1979 QualType DestType;
1980 QualType FromRecordType;
1981 QualType FromType = From->getType();
1982 bool PointerConversions = false;
1983 if (isa<FieldDecl>(Member)) {
1984 DestRecordType = Context.getCanonicalType(Context.getTypeDeclType(RD));
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001985
Douglas Gregor5fccd362010-03-03 23:55:11 +00001986 if (FromType->getAs<PointerType>()) {
1987 DestType = Context.getPointerType(DestRecordType);
1988 FromRecordType = FromType->getPointeeType();
1989 PointerConversions = true;
1990 } else {
1991 DestType = DestRecordType;
1992 FromRecordType = FromType;
Fariborz Jahanian98a541e2009-07-29 18:40:24 +00001993 }
Douglas Gregor5fccd362010-03-03 23:55:11 +00001994 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) {
1995 if (Method->isStatic())
John Wiegley429bb272011-04-08 18:41:53 +00001996 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001997
Douglas Gregor5fccd362010-03-03 23:55:11 +00001998 DestType = Method->getThisType(Context);
1999 DestRecordType = DestType->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002000
Douglas Gregor5fccd362010-03-03 23:55:11 +00002001 if (FromType->getAs<PointerType>()) {
2002 FromRecordType = FromType->getPointeeType();
2003 PointerConversions = true;
2004 } else {
2005 FromRecordType = FromType;
2006 DestType = DestRecordType;
2007 }
2008 } else {
2009 // No conversion necessary.
John Wiegley429bb272011-04-08 18:41:53 +00002010 return Owned(From);
Douglas Gregor5fccd362010-03-03 23:55:11 +00002011 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002012
Douglas Gregor5fccd362010-03-03 23:55:11 +00002013 if (DestType->isDependentType() || FromType->isDependentType())
John Wiegley429bb272011-04-08 18:41:53 +00002014 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002015
Douglas Gregor5fccd362010-03-03 23:55:11 +00002016 // If the unqualified types are the same, no conversion is necessary.
2017 if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
John Wiegley429bb272011-04-08 18:41:53 +00002018 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002019
John McCall6bb80172010-03-30 21:47:33 +00002020 SourceRange FromRange = From->getSourceRange();
2021 SourceLocation FromLoc = FromRange.getBegin();
2022
John McCall5baba9d2010-08-25 10:28:54 +00002023 ExprValueKind VK = CastCategory(From);
Sebastian Redl906082e2010-07-20 04:20:21 +00002024
Douglas Gregor5fccd362010-03-03 23:55:11 +00002025 // C++ [class.member.lookup]p8:
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002026 // [...] Ambiguities can often be resolved by qualifying a name with its
Douglas Gregor5fccd362010-03-03 23:55:11 +00002027 // class name.
2028 //
2029 // If the member was a qualified name and the qualified referred to a
2030 // specific base subobject type, we'll cast to that intermediate type
2031 // first and then to the object in which the member is declared. That allows
2032 // one to resolve ambiguities in, e.g., a diamond-shaped hierarchy such as:
2033 //
2034 // class Base { public: int x; };
2035 // class Derived1 : public Base { };
2036 // class Derived2 : public Base { };
2037 // class VeryDerived : public Derived1, public Derived2 { void f(); };
2038 //
2039 // void VeryDerived::f() {
2040 // x = 17; // error: ambiguous base subobjects
2041 // Derived1::x = 17; // okay, pick the Base subobject of Derived1
2042 // }
Douglas Gregor5fccd362010-03-03 23:55:11 +00002043 if (Qualifier) {
John McCall6bb80172010-03-30 21:47:33 +00002044 QualType QType = QualType(Qualifier->getAsType(), 0);
2045 assert(!QType.isNull() && "lookup done with dependent qualifier?");
2046 assert(QType->isRecordType() && "lookup done with non-record type");
2047
2048 QualType QRecordType = QualType(QType->getAs<RecordType>(), 0);
2049
2050 // In C++98, the qualifier type doesn't actually have to be a base
2051 // type of the object type, in which case we just ignore it.
2052 // Otherwise build the appropriate casts.
2053 if (IsDerivedFrom(FromRecordType, QRecordType)) {
John McCallf871d0c2010-08-07 06:22:56 +00002054 CXXCastPath BasePath;
John McCall6bb80172010-03-30 21:47:33 +00002055 if (CheckDerivedToBaseConversion(FromRecordType, QRecordType,
Anders Carlssoncee22422010-04-24 19:22:20 +00002056 FromLoc, FromRange, &BasePath))
John Wiegley429bb272011-04-08 18:41:53 +00002057 return ExprError();
John McCall6bb80172010-03-30 21:47:33 +00002058
Douglas Gregor5fccd362010-03-03 23:55:11 +00002059 if (PointerConversions)
John McCall6bb80172010-03-30 21:47:33 +00002060 QType = Context.getPointerType(QType);
John Wiegley429bb272011-04-08 18:41:53 +00002061 From = ImpCastExprToType(From, QType, CK_UncheckedDerivedToBase,
2062 VK, &BasePath).take();
John McCall6bb80172010-03-30 21:47:33 +00002063
2064 FromType = QType;
2065 FromRecordType = QRecordType;
2066
2067 // If the qualifier type was the same as the destination type,
2068 // we're done.
2069 if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
John Wiegley429bb272011-04-08 18:41:53 +00002070 return Owned(From);
Douglas Gregor5fccd362010-03-03 23:55:11 +00002071 }
2072 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002073
John McCall6bb80172010-03-30 21:47:33 +00002074 bool IgnoreAccess = false;
Douglas Gregor5fccd362010-03-03 23:55:11 +00002075
John McCall6bb80172010-03-30 21:47:33 +00002076 // If we actually found the member through a using declaration, cast
2077 // down to the using declaration's type.
2078 //
2079 // Pointer equality is fine here because only one declaration of a
2080 // class ever has member declarations.
2081 if (FoundDecl->getDeclContext() != Member->getDeclContext()) {
2082 assert(isa<UsingShadowDecl>(FoundDecl));
2083 QualType URecordType = Context.getTypeDeclType(
2084 cast<CXXRecordDecl>(FoundDecl->getDeclContext()));
2085
2086 // We only need to do this if the naming-class to declaring-class
2087 // conversion is non-trivial.
2088 if (!Context.hasSameUnqualifiedType(FromRecordType, URecordType)) {
2089 assert(IsDerivedFrom(FromRecordType, URecordType));
John McCallf871d0c2010-08-07 06:22:56 +00002090 CXXCastPath BasePath;
John McCall6bb80172010-03-30 21:47:33 +00002091 if (CheckDerivedToBaseConversion(FromRecordType, URecordType,
Anders Carlssoncee22422010-04-24 19:22:20 +00002092 FromLoc, FromRange, &BasePath))
John Wiegley429bb272011-04-08 18:41:53 +00002093 return ExprError();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00002094
John McCall6bb80172010-03-30 21:47:33 +00002095 QualType UType = URecordType;
2096 if (PointerConversions)
2097 UType = Context.getPointerType(UType);
John Wiegley429bb272011-04-08 18:41:53 +00002098 From = ImpCastExprToType(From, UType, CK_UncheckedDerivedToBase,
2099 VK, &BasePath).take();
John McCall6bb80172010-03-30 21:47:33 +00002100 FromType = UType;
2101 FromRecordType = URecordType;
2102 }
2103
2104 // We don't do access control for the conversion from the
2105 // declaring class to the true declaring class.
2106 IgnoreAccess = true;
Douglas Gregor5fccd362010-03-03 23:55:11 +00002107 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002108
John McCallf871d0c2010-08-07 06:22:56 +00002109 CXXCastPath BasePath;
Anders Carlssoncee22422010-04-24 19:22:20 +00002110 if (CheckDerivedToBaseConversion(FromRecordType, DestRecordType,
2111 FromLoc, FromRange, &BasePath,
John McCall6bb80172010-03-30 21:47:33 +00002112 IgnoreAccess))
John Wiegley429bb272011-04-08 18:41:53 +00002113 return ExprError();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002114
John Wiegley429bb272011-04-08 18:41:53 +00002115 return ImpCastExprToType(From, DestType, CK_UncheckedDerivedToBase,
2116 VK, &BasePath);
Fariborz Jahanian98a541e2009-07-29 18:40:24 +00002117}
Douglas Gregor751f9a42009-06-30 15:47:41 +00002118
John McCallf7a1a742009-11-24 19:00:30 +00002119bool Sema::UseArgumentDependentLookup(const CXXScopeSpec &SS,
John McCall5b3f9132009-11-22 01:44:31 +00002120 const LookupResult &R,
2121 bool HasTrailingLParen) {
John McCallba135432009-11-21 08:51:07 +00002122 // Only when used directly as the postfix-expression of a call.
2123 if (!HasTrailingLParen)
2124 return false;
2125
2126 // Never if a scope specifier was provided.
John McCallf7a1a742009-11-24 19:00:30 +00002127 if (SS.isSet())
John McCallba135432009-11-21 08:51:07 +00002128 return false;
2129
2130 // Only in C++ or ObjC++.
John McCall5b3f9132009-11-22 01:44:31 +00002131 if (!getLangOptions().CPlusPlus)
John McCallba135432009-11-21 08:51:07 +00002132 return false;
2133
2134 // Turn off ADL when we find certain kinds of declarations during
2135 // normal lookup:
2136 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
2137 NamedDecl *D = *I;
2138
2139 // C++0x [basic.lookup.argdep]p3:
2140 // -- a declaration of a class member
2141 // Since using decls preserve this property, we check this on the
2142 // original decl.
John McCall3b4294e2009-12-16 12:17:52 +00002143 if (D->isCXXClassMember())
John McCallba135432009-11-21 08:51:07 +00002144 return false;
2145
2146 // C++0x [basic.lookup.argdep]p3:
2147 // -- a block-scope function declaration that is not a
2148 // using-declaration
2149 // NOTE: we also trigger this for function templates (in fact, we
2150 // don't check the decl type at all, since all other decl types
2151 // turn off ADL anyway).
2152 if (isa<UsingShadowDecl>(D))
2153 D = cast<UsingShadowDecl>(D)->getTargetDecl();
2154 else if (D->getDeclContext()->isFunctionOrMethod())
2155 return false;
2156
2157 // C++0x [basic.lookup.argdep]p3:
2158 // -- a declaration that is neither a function or a function
2159 // template
2160 // And also for builtin functions.
2161 if (isa<FunctionDecl>(D)) {
2162 FunctionDecl *FDecl = cast<FunctionDecl>(D);
2163
2164 // But also builtin functions.
2165 if (FDecl->getBuiltinID() && FDecl->isImplicit())
2166 return false;
2167 } else if (!isa<FunctionTemplateDecl>(D))
2168 return false;
2169 }
2170
2171 return true;
2172}
2173
2174
John McCallba135432009-11-21 08:51:07 +00002175/// Diagnoses obvious problems with the use of the given declaration
2176/// as an expression. This is only actually called for lookups that
2177/// were not overloaded, and it doesn't promise that the declaration
2178/// will in fact be used.
2179static bool CheckDeclInExpr(Sema &S, SourceLocation Loc, NamedDecl *D) {
Richard Smith162e1c12011-04-15 14:24:37 +00002180 if (isa<TypedefNameDecl>(D)) {
John McCallba135432009-11-21 08:51:07 +00002181 S.Diag(Loc, diag::err_unexpected_typedef) << D->getDeclName();
2182 return true;
2183 }
2184
2185 if (isa<ObjCInterfaceDecl>(D)) {
2186 S.Diag(Loc, diag::err_unexpected_interface) << D->getDeclName();
2187 return true;
2188 }
2189
2190 if (isa<NamespaceDecl>(D)) {
2191 S.Diag(Loc, diag::err_unexpected_namespace) << D->getDeclName();
2192 return true;
2193 }
2194
2195 return false;
2196}
2197
John McCall60d7b3a2010-08-24 06:29:42 +00002198ExprResult
John McCallf7a1a742009-11-24 19:00:30 +00002199Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
John McCall5b3f9132009-11-22 01:44:31 +00002200 LookupResult &R,
2201 bool NeedsADL) {
John McCallfead20c2009-12-08 22:45:53 +00002202 // If this is a single, fully-resolved result and we don't need ADL,
2203 // just build an ordinary singleton decl ref.
Douglas Gregor86b8e092010-01-29 17:15:43 +00002204 if (!NeedsADL && R.isSingleResult() && !R.getAsSingle<FunctionTemplateDecl>())
Abramo Bagnara25777432010-08-11 22:01:17 +00002205 return BuildDeclarationNameExpr(SS, R.getLookupNameInfo(),
2206 R.getFoundDecl());
John McCallba135432009-11-21 08:51:07 +00002207
2208 // We only need to check the declaration if there's exactly one
2209 // result, because in the overloaded case the results can only be
2210 // functions and function templates.
John McCall5b3f9132009-11-22 01:44:31 +00002211 if (R.isSingleResult() &&
2212 CheckDeclInExpr(*this, R.getNameLoc(), R.getFoundDecl()))
John McCallba135432009-11-21 08:51:07 +00002213 return ExprError();
2214
John McCallc373d482010-01-27 01:50:18 +00002215 // Otherwise, just build an unresolved lookup expression. Suppress
2216 // any lookup-related diagnostics; we'll hash these out later, when
2217 // we've picked a target.
2218 R.suppressDiagnostics();
2219
John McCallba135432009-11-21 08:51:07 +00002220 UnresolvedLookupExpr *ULE
Douglas Gregorbebbe0d2010-12-15 01:34:56 +00002221 = UnresolvedLookupExpr::Create(Context, R.getNamingClass(),
Douglas Gregor4c9be892011-02-28 20:01:57 +00002222 SS.getWithLocInContext(Context),
2223 R.getLookupNameInfo(),
Douglas Gregor5a84dec2010-05-23 18:57:34 +00002224 NeedsADL, R.isOverloadedResult(),
2225 R.begin(), R.end());
John McCallba135432009-11-21 08:51:07 +00002226
2227 return Owned(ULE);
2228}
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002229
John McCallba135432009-11-21 08:51:07 +00002230/// \brief Complete semantic analysis for a reference to the given declaration.
John McCall60d7b3a2010-08-24 06:29:42 +00002231ExprResult
John McCallf7a1a742009-11-24 19:00:30 +00002232Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00002233 const DeclarationNameInfo &NameInfo,
2234 NamedDecl *D) {
John McCallba135432009-11-21 08:51:07 +00002235 assert(D && "Cannot refer to a NULL declaration");
John McCall7453ed42009-11-22 00:44:51 +00002236 assert(!isa<FunctionTemplateDecl>(D) &&
2237 "Cannot refer unambiguously to a function template");
John McCallba135432009-11-21 08:51:07 +00002238
Abramo Bagnara25777432010-08-11 22:01:17 +00002239 SourceLocation Loc = NameInfo.getLoc();
John McCallba135432009-11-21 08:51:07 +00002240 if (CheckDeclInExpr(*this, Loc, D))
2241 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00002242
Douglas Gregor9af2f522009-12-01 16:58:18 +00002243 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) {
2244 // Specifically diagnose references to class templates that are missing
2245 // a template argument list.
2246 Diag(Loc, diag::err_template_decl_ref)
2247 << Template << SS.getRange();
2248 Diag(Template->getLocation(), diag::note_template_decl_here);
2249 return ExprError();
2250 }
2251
2252 // Make sure that we're referring to a value.
2253 ValueDecl *VD = dyn_cast<ValueDecl>(D);
2254 if (!VD) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002255 Diag(Loc, diag::err_ref_non_value)
Douglas Gregor9af2f522009-12-01 16:58:18 +00002256 << D << SS.getRange();
John McCall87cf6702009-12-18 18:35:10 +00002257 Diag(D->getLocation(), diag::note_declared_at);
Douglas Gregor9af2f522009-12-01 16:58:18 +00002258 return ExprError();
2259 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002260
Douglas Gregor48f3bb92009-02-18 21:56:37 +00002261 // Check whether this declaration can be used. Note that we suppress
2262 // this check when we're going to perform argument-dependent lookup
2263 // on this function name, because this might not be the function
2264 // that overload resolution actually selects.
John McCallba135432009-11-21 08:51:07 +00002265 if (DiagnoseUseOfDecl(VD, Loc))
Douglas Gregor48f3bb92009-02-18 21:56:37 +00002266 return ExprError();
2267
Steve Naroffdd972f22008-09-05 22:11:13 +00002268 // Only create DeclRefExpr's for valid Decl's.
2269 if (VD->isInvalidDecl())
Sebastian Redlcd965b92009-01-18 18:53:16 +00002270 return ExprError();
2271
John McCall5808ce42011-02-03 08:15:49 +00002272 // Handle members of anonymous structs and unions. If we got here,
2273 // and the reference is to a class member indirect field, then this
2274 // must be the subject of a pointer-to-member expression.
2275 if (IndirectFieldDecl *indirectField = dyn_cast<IndirectFieldDecl>(VD))
2276 if (!indirectField->isCXXClassMember())
2277 return BuildAnonymousStructUnionMemberReference(SS, NameInfo.getLoc(),
2278 indirectField);
Francois Pichet87c2e122010-11-21 06:08:52 +00002279
Chris Lattner639e2d32008-10-20 05:16:36 +00002280 // If the identifier reference is inside a block, and it refers to a value
2281 // that is outside the block, create a BlockDeclRefExpr instead of a
2282 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when
2283 // the block is formed.
Steve Naroffdd972f22008-09-05 22:11:13 +00002284 //
Chris Lattner639e2d32008-10-20 05:16:36 +00002285 // We do not do this for things like enum constants, global variables, etc,
2286 // as they do not get snapshotted.
2287 //
John McCall6b5a61b2011-02-07 10:33:21 +00002288 switch (shouldCaptureValueReference(*this, NameInfo.getLoc(), VD)) {
John McCall469a1eb2011-02-02 13:00:07 +00002289 case CR_Error:
2290 return ExprError();
Mike Stump0d6fd572010-01-05 02:56:35 +00002291
John McCall469a1eb2011-02-02 13:00:07 +00002292 case CR_Capture:
John McCall6b5a61b2011-02-07 10:33:21 +00002293 assert(!SS.isSet() && "referenced local variable with scope specifier?");
2294 return BuildBlockDeclRefExpr(*this, VD, NameInfo, /*byref*/ false);
2295
2296 case CR_CaptureByRef:
2297 assert(!SS.isSet() && "referenced local variable with scope specifier?");
2298 return BuildBlockDeclRefExpr(*this, VD, NameInfo, /*byref*/ true);
John McCall76a40212011-02-09 01:13:10 +00002299
2300 case CR_NoCapture: {
2301 // If this reference is not in a block or if the referenced
2302 // variable is within the block, create a normal DeclRefExpr.
2303
2304 QualType type = VD->getType();
Daniel Dunbarb20de812011-02-10 18:29:28 +00002305 ExprValueKind valueKind = VK_RValue;
John McCall76a40212011-02-09 01:13:10 +00002306
2307 switch (D->getKind()) {
2308 // Ignore all the non-ValueDecl kinds.
2309#define ABSTRACT_DECL(kind)
2310#define VALUE(type, base)
2311#define DECL(type, base) \
2312 case Decl::type:
2313#include "clang/AST/DeclNodes.inc"
2314 llvm_unreachable("invalid value decl kind");
2315 return ExprError();
2316
2317 // These shouldn't make it here.
2318 case Decl::ObjCAtDefsField:
2319 case Decl::ObjCIvar:
2320 llvm_unreachable("forming non-member reference to ivar?");
2321 return ExprError();
2322
2323 // Enum constants are always r-values and never references.
2324 // Unresolved using declarations are dependent.
2325 case Decl::EnumConstant:
2326 case Decl::UnresolvedUsingValue:
2327 valueKind = VK_RValue;
2328 break;
2329
2330 // Fields and indirect fields that got here must be for
2331 // pointer-to-member expressions; we just call them l-values for
2332 // internal consistency, because this subexpression doesn't really
2333 // exist in the high-level semantics.
2334 case Decl::Field:
2335 case Decl::IndirectField:
2336 assert(getLangOptions().CPlusPlus &&
2337 "building reference to field in C?");
2338
2339 // These can't have reference type in well-formed programs, but
2340 // for internal consistency we do this anyway.
2341 type = type.getNonReferenceType();
2342 valueKind = VK_LValue;
2343 break;
2344
2345 // Non-type template parameters are either l-values or r-values
2346 // depending on the type.
2347 case Decl::NonTypeTemplateParm: {
2348 if (const ReferenceType *reftype = type->getAs<ReferenceType>()) {
2349 type = reftype->getPointeeType();
2350 valueKind = VK_LValue; // even if the parameter is an r-value reference
2351 break;
2352 }
2353
2354 // For non-references, we need to strip qualifiers just in case
2355 // the template parameter was declared as 'const int' or whatever.
2356 valueKind = VK_RValue;
2357 type = type.getUnqualifiedType();
2358 break;
2359 }
2360
2361 case Decl::Var:
2362 // In C, "extern void blah;" is valid and is an r-value.
2363 if (!getLangOptions().CPlusPlus &&
2364 !type.hasQualifiers() &&
2365 type->isVoidType()) {
2366 valueKind = VK_RValue;
2367 break;
2368 }
2369 // fallthrough
2370
2371 case Decl::ImplicitParam:
2372 case Decl::ParmVar:
2373 // These are always l-values.
2374 valueKind = VK_LValue;
2375 type = type.getNonReferenceType();
2376 break;
2377
2378 case Decl::Function: {
John McCall755d8492011-04-12 00:42:48 +00002379 const FunctionType *fty = type->castAs<FunctionType>();
2380
2381 // If we're referring to a function with an __unknown_anytype
2382 // result type, make the entire expression __unknown_anytype.
2383 if (fty->getResultType() == Context.UnknownAnyTy) {
2384 type = Context.UnknownAnyTy;
2385 valueKind = VK_RValue;
2386 break;
2387 }
2388
John McCall76a40212011-02-09 01:13:10 +00002389 // Functions are l-values in C++.
2390 if (getLangOptions().CPlusPlus) {
2391 valueKind = VK_LValue;
2392 break;
2393 }
2394
2395 // C99 DR 316 says that, if a function type comes from a
2396 // function definition (without a prototype), that type is only
2397 // used for checking compatibility. Therefore, when referencing
2398 // the function, we pretend that we don't have the full function
2399 // type.
John McCall755d8492011-04-12 00:42:48 +00002400 if (!cast<FunctionDecl>(VD)->hasPrototype() &&
2401 isa<FunctionProtoType>(fty))
2402 type = Context.getFunctionNoProtoType(fty->getResultType(),
2403 fty->getExtInfo());
John McCall76a40212011-02-09 01:13:10 +00002404
2405 // Functions are r-values in C.
2406 valueKind = VK_RValue;
2407 break;
2408 }
2409
2410 case Decl::CXXMethod:
John McCall755d8492011-04-12 00:42:48 +00002411 // If we're referring to a method with an __unknown_anytype
2412 // result type, make the entire expression __unknown_anytype.
2413 // This should only be possible with a type written directly.
Richard Trieu67e29332011-08-02 04:35:43 +00002414 if (const FunctionProtoType *proto
2415 = dyn_cast<FunctionProtoType>(VD->getType()))
John McCall755d8492011-04-12 00:42:48 +00002416 if (proto->getResultType() == Context.UnknownAnyTy) {
2417 type = Context.UnknownAnyTy;
2418 valueKind = VK_RValue;
2419 break;
2420 }
2421
John McCall76a40212011-02-09 01:13:10 +00002422 // C++ methods are l-values if static, r-values if non-static.
2423 if (cast<CXXMethodDecl>(VD)->isStatic()) {
2424 valueKind = VK_LValue;
2425 break;
2426 }
2427 // fallthrough
2428
2429 case Decl::CXXConversion:
2430 case Decl::CXXDestructor:
2431 case Decl::CXXConstructor:
2432 valueKind = VK_RValue;
2433 break;
2434 }
2435
2436 return BuildDeclRefExpr(VD, type, valueKind, NameInfo, &SS);
2437 }
2438
John McCall469a1eb2011-02-02 13:00:07 +00002439 }
John McCallf89e55a2010-11-18 06:31:45 +00002440
John McCall6b5a61b2011-02-07 10:33:21 +00002441 llvm_unreachable("unknown capture result");
2442 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00002443}
2444
John McCall755d8492011-04-12 00:42:48 +00002445ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, tok::TokenKind Kind) {
Chris Lattnerd9f69102008-08-10 01:53:14 +00002446 PredefinedExpr::IdentType IT;
Sebastian Redlcd965b92009-01-18 18:53:16 +00002447
Reid Spencer5f016e22007-07-11 17:01:13 +00002448 switch (Kind) {
Chris Lattner1423ea42008-01-12 18:39:25 +00002449 default: assert(0 && "Unknown simple primary expr!");
Chris Lattnerd9f69102008-08-10 01:53:14 +00002450 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2]
2451 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break;
2452 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00002453 }
Chris Lattner1423ea42008-01-12 18:39:25 +00002454
Chris Lattnerfa28b302008-01-12 08:14:25 +00002455 // Pre-defined identifiers are of type char[x], where x is the length of the
2456 // string.
Mike Stump1eb44332009-09-09 15:08:12 +00002457
Anders Carlsson3a082d82009-09-08 18:24:21 +00002458 Decl *currentDecl = getCurFunctionOrMethodDecl();
Fariborz Jahanianeb024ac2010-07-23 21:53:24 +00002459 if (!currentDecl && getCurBlock())
2460 currentDecl = getCurBlock()->TheDecl;
Anders Carlsson3a082d82009-09-08 18:24:21 +00002461 if (!currentDecl) {
Chris Lattnerb0da9232008-12-12 05:05:20 +00002462 Diag(Loc, diag::ext_predef_outside_function);
Anders Carlsson3a082d82009-09-08 18:24:21 +00002463 currentDecl = Context.getTranslationUnitDecl();
Chris Lattnerb0da9232008-12-12 05:05:20 +00002464 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002465
Anders Carlsson773f3972009-09-11 01:22:35 +00002466 QualType ResTy;
2467 if (cast<DeclContext>(currentDecl)->isDependentContext()) {
2468 ResTy = Context.DependentTy;
2469 } else {
Anders Carlsson848fa642010-02-11 18:20:28 +00002470 unsigned Length = PredefinedExpr::ComputeName(IT, currentDecl).length();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002471
Anders Carlsson773f3972009-09-11 01:22:35 +00002472 llvm::APInt LengthI(32, Length + 1);
John McCall0953e762009-09-24 19:53:00 +00002473 ResTy = Context.CharTy.withConst();
Anders Carlsson773f3972009-09-11 01:22:35 +00002474 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0);
2475 }
Steve Naroff6ece14c2009-01-21 00:14:39 +00002476 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT));
Reid Spencer5f016e22007-07-11 17:01:13 +00002477}
2478
John McCall60d7b3a2010-08-24 06:29:42 +00002479ExprResult Sema::ActOnCharacterConstant(const Token &Tok) {
Reid Spencer5f016e22007-07-11 17:01:13 +00002480 llvm::SmallString<16> CharBuffer;
Douglas Gregor453091c2010-03-16 22:30:13 +00002481 bool Invalid = false;
Chris Lattner5f9e2722011-07-23 10:55:15 +00002482 StringRef ThisTok = PP.getSpelling(Tok, CharBuffer, &Invalid);
Douglas Gregor453091c2010-03-16 22:30:13 +00002483 if (Invalid)
2484 return ExprError();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002485
Benjamin Kramerddeea562010-02-27 13:44:12 +00002486 CharLiteralParser Literal(ThisTok.begin(), ThisTok.end(), Tok.getLocation(),
Douglas Gregor5cee1192011-07-27 05:40:30 +00002487 PP, Tok.getKind());
Reid Spencer5f016e22007-07-11 17:01:13 +00002488 if (Literal.hadError())
Sebastian Redlcd965b92009-01-18 18:53:16 +00002489 return ExprError();
Chris Lattnerfc62bfd2008-03-01 08:32:21 +00002490
Chris Lattnere8337df2009-12-30 21:19:39 +00002491 QualType Ty;
2492 if (!getLangOptions().CPlusPlus)
2493 Ty = Context.IntTy; // 'x' and L'x' -> int in C.
2494 else if (Literal.isWide())
2495 Ty = Context.WCharTy; // L'x' -> wchar_t in C++.
Douglas Gregor5cee1192011-07-27 05:40:30 +00002496 else if (Literal.isUTF16())
2497 Ty = Context.Char16Ty; // u'x' -> char16_t in C++0x.
2498 else if (Literal.isUTF32())
2499 Ty = Context.Char32Ty; // U'x' -> char32_t in C++0x.
Eli Friedman136b0cd2010-02-03 18:21:45 +00002500 else if (Literal.isMultiChar())
2501 Ty = Context.IntTy; // 'wxyz' -> int in C++.
Chris Lattnere8337df2009-12-30 21:19:39 +00002502 else
2503 Ty = Context.CharTy; // 'x' -> char in C++
Chris Lattnerfc62bfd2008-03-01 08:32:21 +00002504
Douglas Gregor5cee1192011-07-27 05:40:30 +00002505 CharacterLiteral::CharacterKind Kind = CharacterLiteral::Ascii;
2506 if (Literal.isWide())
2507 Kind = CharacterLiteral::Wide;
2508 else if (Literal.isUTF16())
2509 Kind = CharacterLiteral::UTF16;
2510 else if (Literal.isUTF32())
2511 Kind = CharacterLiteral::UTF32;
2512
2513 return Owned(new (Context) CharacterLiteral(Literal.getValue(), Kind, Ty,
2514 Tok.getLocation()));
Reid Spencer5f016e22007-07-11 17:01:13 +00002515}
2516
John McCall60d7b3a2010-08-24 06:29:42 +00002517ExprResult Sema::ActOnNumericConstant(const Token &Tok) {
Sebastian Redlcd965b92009-01-18 18:53:16 +00002518 // Fast path for a single digit (which is quite common). A single digit
Reid Spencer5f016e22007-07-11 17:01:13 +00002519 // cannot have a trigraph, escaped newline, radix prefix, or type suffix.
2520 if (Tok.getLength() == 1) {
Chris Lattner7216dc92009-01-26 22:36:52 +00002521 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok);
Chris Lattner0c21e842009-01-16 07:10:29 +00002522 unsigned IntSize = Context.Target.getIntWidth();
Argyrios Kyrtzidis9996a7f2010-08-28 09:06:06 +00002523 return Owned(IntegerLiteral::Create(Context, llvm::APInt(IntSize, Val-'0'),
Steve Naroff0a473932009-01-20 19:53:53 +00002524 Context.IntTy, Tok.getLocation()));
Reid Spencer5f016e22007-07-11 17:01:13 +00002525 }
Ted Kremenek28396602009-01-13 23:19:12 +00002526
Reid Spencer5f016e22007-07-11 17:01:13 +00002527 llvm::SmallString<512> IntegerBuffer;
Chris Lattner2a299042008-09-30 20:53:45 +00002528 // Add padding so that NumericLiteralParser can overread by one character.
2529 IntegerBuffer.resize(Tok.getLength()+1);
Reid Spencer5f016e22007-07-11 17:01:13 +00002530 const char *ThisTokBegin = &IntegerBuffer[0];
Sebastian Redlcd965b92009-01-18 18:53:16 +00002531
Reid Spencer5f016e22007-07-11 17:01:13 +00002532 // Get the spelling of the token, which eliminates trigraphs, etc.
Douglas Gregor453091c2010-03-16 22:30:13 +00002533 bool Invalid = false;
2534 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin, &Invalid);
2535 if (Invalid)
2536 return ExprError();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002537
Mike Stump1eb44332009-09-09 15:08:12 +00002538 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength,
Reid Spencer5f016e22007-07-11 17:01:13 +00002539 Tok.getLocation(), PP);
2540 if (Literal.hadError)
Sebastian Redlcd965b92009-01-18 18:53:16 +00002541 return ExprError();
2542
Chris Lattner5d661452007-08-26 03:42:43 +00002543 Expr *Res;
Sebastian Redlcd965b92009-01-18 18:53:16 +00002544
Chris Lattner5d661452007-08-26 03:42:43 +00002545 if (Literal.isFloatingLiteral()) {
Chris Lattner525a0502007-09-22 18:29:59 +00002546 QualType Ty;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002547 if (Literal.isFloat)
Chris Lattner525a0502007-09-22 18:29:59 +00002548 Ty = Context.FloatTy;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002549 else if (!Literal.isLong)
Chris Lattner525a0502007-09-22 18:29:59 +00002550 Ty = Context.DoubleTy;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002551 else
Chris Lattner9e9b6dc2008-03-08 08:52:55 +00002552 Ty = Context.LongDoubleTy;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002553
2554 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty);
2555
John McCall94c939d2009-12-24 09:08:04 +00002556 using llvm::APFloat;
2557 APFloat Val(Format);
2558
2559 APFloat::opStatus result = Literal.GetFloatValue(Val);
John McCall9f2df882009-12-24 11:09:08 +00002560
2561 // Overflow is always an error, but underflow is only an error if
2562 // we underflowed to zero (APFloat reports denormals as underflow).
2563 if ((result & APFloat::opOverflow) ||
2564 ((result & APFloat::opUnderflow) && Val.isZero())) {
John McCall94c939d2009-12-24 09:08:04 +00002565 unsigned diagnostic;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002566 llvm::SmallString<20> buffer;
John McCall94c939d2009-12-24 09:08:04 +00002567 if (result & APFloat::opOverflow) {
John McCall2a0d7572010-02-26 23:35:57 +00002568 diagnostic = diag::warn_float_overflow;
John McCall94c939d2009-12-24 09:08:04 +00002569 APFloat::getLargest(Format).toString(buffer);
2570 } else {
John McCall2a0d7572010-02-26 23:35:57 +00002571 diagnostic = diag::warn_float_underflow;
John McCall94c939d2009-12-24 09:08:04 +00002572 APFloat::getSmallest(Format).toString(buffer);
2573 }
2574
2575 Diag(Tok.getLocation(), diagnostic)
2576 << Ty
Chris Lattner5f9e2722011-07-23 10:55:15 +00002577 << StringRef(buffer.data(), buffer.size());
John McCall94c939d2009-12-24 09:08:04 +00002578 }
2579
2580 bool isExact = (result == APFloat::opOK);
Argyrios Kyrtzidis9996a7f2010-08-28 09:06:06 +00002581 Res = FloatingLiteral::Create(Context, Val, isExact, Ty, Tok.getLocation());
Sebastian Redlcd965b92009-01-18 18:53:16 +00002582
Peter Collingbournef4f7cb82011-03-11 19:24:59 +00002583 if (Ty == Context.DoubleTy) {
2584 if (getLangOptions().SinglePrecisionConstants) {
John Wiegley429bb272011-04-08 18:41:53 +00002585 Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).take();
Peter Collingbournef4f7cb82011-03-11 19:24:59 +00002586 } else if (getLangOptions().OpenCL && !getOpenCLOptions().cl_khr_fp64) {
2587 Diag(Tok.getLocation(), diag::warn_double_const_requires_fp64);
John Wiegley429bb272011-04-08 18:41:53 +00002588 Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).take();
Peter Collingbournef4f7cb82011-03-11 19:24:59 +00002589 }
2590 }
Chris Lattner5d661452007-08-26 03:42:43 +00002591 } else if (!Literal.isIntegerLiteral()) {
Sebastian Redlcd965b92009-01-18 18:53:16 +00002592 return ExprError();
Chris Lattner5d661452007-08-26 03:42:43 +00002593 } else {
Chris Lattnerf0467b32008-04-02 04:24:33 +00002594 QualType Ty;
Reid Spencer5f016e22007-07-11 17:01:13 +00002595
Neil Boothb9449512007-08-29 22:00:19 +00002596 // long long is a C99 feature.
2597 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x &&
Neil Booth79859c32007-08-29 22:13:52 +00002598 Literal.isLongLong)
Neil Boothb9449512007-08-29 22:00:19 +00002599 Diag(Tok.getLocation(), diag::ext_longlong);
2600
Reid Spencer5f016e22007-07-11 17:01:13 +00002601 // Get the value in the widest-possible width.
Chris Lattner98be4942008-03-05 18:54:05 +00002602 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0);
Sebastian Redlcd965b92009-01-18 18:53:16 +00002603
Reid Spencer5f016e22007-07-11 17:01:13 +00002604 if (Literal.GetIntegerValue(ResultVal)) {
2605 // If this value didn't fit into uintmax_t, warn and force to ull.
2606 Diag(Tok.getLocation(), diag::warn_integer_too_large);
Chris Lattnerf0467b32008-04-02 04:24:33 +00002607 Ty = Context.UnsignedLongLongTy;
2608 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() &&
Chris Lattner98be4942008-03-05 18:54:05 +00002609 "long long is not intmax_t?");
Reid Spencer5f016e22007-07-11 17:01:13 +00002610 } else {
2611 // If this value fits into a ULL, try to figure out what else it fits into
2612 // according to the rules of C99 6.4.4.1p5.
Sebastian Redlcd965b92009-01-18 18:53:16 +00002613
Reid Spencer5f016e22007-07-11 17:01:13 +00002614 // Octal, Hexadecimal, and integers with a U suffix are allowed to
2615 // be an unsigned int.
2616 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10;
2617
2618 // Check from smallest to largest, picking the smallest type we can.
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002619 unsigned Width = 0;
Chris Lattner97c51562007-08-23 21:58:08 +00002620 if (!Literal.isLong && !Literal.isLongLong) {
2621 // Are int/unsigned possibilities?
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002622 unsigned IntSize = Context.Target.getIntWidth();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002623
Reid Spencer5f016e22007-07-11 17:01:13 +00002624 // Does it fit in a unsigned int?
2625 if (ResultVal.isIntN(IntSize)) {
2626 // Does it fit in a signed int?
2627 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002628 Ty = Context.IntTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00002629 else if (AllowUnsigned)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002630 Ty = Context.UnsignedIntTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002631 Width = IntSize;
Reid Spencer5f016e22007-07-11 17:01:13 +00002632 }
Reid Spencer5f016e22007-07-11 17:01:13 +00002633 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002634
Reid Spencer5f016e22007-07-11 17:01:13 +00002635 // Are long/unsigned long possibilities?
Chris Lattnerf0467b32008-04-02 04:24:33 +00002636 if (Ty.isNull() && !Literal.isLongLong) {
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002637 unsigned LongSize = Context.Target.getLongWidth();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002638
Reid Spencer5f016e22007-07-11 17:01:13 +00002639 // Does it fit in a unsigned long?
2640 if (ResultVal.isIntN(LongSize)) {
2641 // Does it fit in a signed long?
2642 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002643 Ty = Context.LongTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00002644 else if (AllowUnsigned)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002645 Ty = Context.UnsignedLongTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002646 Width = LongSize;
Reid Spencer5f016e22007-07-11 17:01:13 +00002647 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002648 }
2649
Reid Spencer5f016e22007-07-11 17:01:13 +00002650 // Finally, check long long if needed.
Chris Lattnerf0467b32008-04-02 04:24:33 +00002651 if (Ty.isNull()) {
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002652 unsigned LongLongSize = Context.Target.getLongLongWidth();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002653
Reid Spencer5f016e22007-07-11 17:01:13 +00002654 // Does it fit in a unsigned long long?
2655 if (ResultVal.isIntN(LongLongSize)) {
2656 // Does it fit in a signed long long?
Francois Pichet24323202011-01-11 23:38:13 +00002657 // To be compatible with MSVC, hex integer literals ending with the
2658 // LL or i64 suffix are always signed in Microsoft mode.
Francois Picheta15a5ee2011-01-11 12:23:00 +00002659 if (!Literal.isUnsigned && (ResultVal[LongLongSize-1] == 0 ||
2660 (getLangOptions().Microsoft && Literal.isLongLong)))
Chris Lattnerf0467b32008-04-02 04:24:33 +00002661 Ty = Context.LongLongTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00002662 else if (AllowUnsigned)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002663 Ty = Context.UnsignedLongLongTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002664 Width = LongLongSize;
Reid Spencer5f016e22007-07-11 17:01:13 +00002665 }
2666 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002667
Reid Spencer5f016e22007-07-11 17:01:13 +00002668 // If we still couldn't decide a type, we probably have something that
2669 // does not fit in a signed long long, but has no U suffix.
Chris Lattnerf0467b32008-04-02 04:24:33 +00002670 if (Ty.isNull()) {
Reid Spencer5f016e22007-07-11 17:01:13 +00002671 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed);
Chris Lattnerf0467b32008-04-02 04:24:33 +00002672 Ty = Context.UnsignedLongLongTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002673 Width = Context.Target.getLongLongWidth();
Reid Spencer5f016e22007-07-11 17:01:13 +00002674 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002675
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002676 if (ResultVal.getBitWidth() != Width)
Jay Foad9f71a8f2010-12-07 08:25:34 +00002677 ResultVal = ResultVal.trunc(Width);
Reid Spencer5f016e22007-07-11 17:01:13 +00002678 }
Argyrios Kyrtzidis9996a7f2010-08-28 09:06:06 +00002679 Res = IntegerLiteral::Create(Context, ResultVal, Ty, Tok.getLocation());
Reid Spencer5f016e22007-07-11 17:01:13 +00002680 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002681
Chris Lattner5d661452007-08-26 03:42:43 +00002682 // If this is an imaginary literal, create the ImaginaryLiteral wrapper.
2683 if (Literal.isImaginary)
Mike Stump1eb44332009-09-09 15:08:12 +00002684 Res = new (Context) ImaginaryLiteral(Res,
Steve Naroff6ece14c2009-01-21 00:14:39 +00002685 Context.getComplexType(Res->getType()));
Sebastian Redlcd965b92009-01-18 18:53:16 +00002686
2687 return Owned(Res);
Reid Spencer5f016e22007-07-11 17:01:13 +00002688}
2689
John McCall60d7b3a2010-08-24 06:29:42 +00002690ExprResult Sema::ActOnParenExpr(SourceLocation L,
John McCall9ae2f072010-08-23 23:25:46 +00002691 SourceLocation R, Expr *E) {
Chris Lattnerf0467b32008-04-02 04:24:33 +00002692 assert((E != 0) && "ActOnParenExpr() missing expr");
Steve Naroff6ece14c2009-01-21 00:14:39 +00002693 return Owned(new (Context) ParenExpr(L, R, E));
Reid Spencer5f016e22007-07-11 17:01:13 +00002694}
2695
Chandler Carruthdf1f3772011-05-26 08:53:12 +00002696static bool CheckVecStepTraitOperandType(Sema &S, QualType T,
2697 SourceLocation Loc,
2698 SourceRange ArgRange) {
2699 // [OpenCL 1.1 6.11.12] "The vec_step built-in function takes a built-in
2700 // scalar or vector data type argument..."
2701 // Every built-in scalar type (OpenCL 1.1 6.1.1) is either an arithmetic
2702 // type (C99 6.2.5p18) or void.
2703 if (!(T->isArithmeticType() || T->isVoidType() || T->isVectorType())) {
2704 S.Diag(Loc, diag::err_vecstep_non_scalar_vector_type)
2705 << T << ArgRange;
2706 return true;
2707 }
2708
2709 assert((T->isVoidType() || !T->isIncompleteType()) &&
2710 "Scalar types should always be complete");
2711 return false;
2712}
2713
Chandler Carruth42ec65d2011-05-26 08:53:16 +00002714static bool CheckExtensionTraitOperandType(Sema &S, QualType T,
2715 SourceLocation Loc,
2716 SourceRange ArgRange,
2717 UnaryExprOrTypeTrait TraitKind) {
2718 // C99 6.5.3.4p1:
2719 if (T->isFunctionType()) {
2720 // alignof(function) is allowed as an extension.
2721 if (TraitKind == UETT_SizeOf)
2722 S.Diag(Loc, diag::ext_sizeof_function_type) << ArgRange;
2723 return false;
2724 }
2725
2726 // Allow sizeof(void)/alignof(void) as an extension.
2727 if (T->isVoidType()) {
2728 S.Diag(Loc, diag::ext_sizeof_void_type) << TraitKind << ArgRange;
2729 return false;
2730 }
2731
2732 return true;
2733}
2734
2735static bool CheckObjCTraitOperandConstraints(Sema &S, QualType T,
2736 SourceLocation Loc,
2737 SourceRange ArgRange,
2738 UnaryExprOrTypeTrait TraitKind) {
2739 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode.
2740 if (S.LangOpts.ObjCNonFragileABI && T->isObjCObjectType()) {
2741 S.Diag(Loc, diag::err_sizeof_nonfragile_interface)
2742 << T << (TraitKind == UETT_SizeOf)
2743 << ArgRange;
2744 return true;
2745 }
2746
2747 return false;
2748}
2749
Chandler Carruth9d342d02011-05-26 08:53:10 +00002750/// \brief Check the constrains on expression operands to unary type expression
2751/// and type traits.
2752///
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002753/// Completes any types necessary and validates the constraints on the operand
2754/// expression. The logic mostly mirrors the type-based overload, but may modify
2755/// the expression as it completes the type for that expression through template
2756/// instantiation, etc.
Chandler Carruth9d342d02011-05-26 08:53:10 +00002757bool Sema::CheckUnaryExprOrTypeTraitOperand(Expr *Op,
2758 UnaryExprOrTypeTrait ExprKind) {
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002759 QualType ExprTy = Op->getType();
2760
2761 // C++ [expr.sizeof]p2: "When applied to a reference or a reference type,
2762 // the result is the size of the referenced type."
2763 // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the
2764 // result shall be the alignment of the referenced type."
2765 if (const ReferenceType *Ref = ExprTy->getAs<ReferenceType>())
2766 ExprTy = Ref->getPointeeType();
2767
2768 if (ExprKind == UETT_VecStep)
2769 return CheckVecStepTraitOperandType(*this, ExprTy, Op->getExprLoc(),
2770 Op->getSourceRange());
2771
2772 // Whitelist some types as extensions
2773 if (!CheckExtensionTraitOperandType(*this, ExprTy, Op->getExprLoc(),
2774 Op->getSourceRange(), ExprKind))
2775 return false;
2776
2777 if (RequireCompleteExprType(Op,
2778 PDiag(diag::err_sizeof_alignof_incomplete_type)
2779 << ExprKind << Op->getSourceRange(),
2780 std::make_pair(SourceLocation(), PDiag(0))))
2781 return true;
2782
2783 // Completeing the expression's type may have changed it.
2784 ExprTy = Op->getType();
2785 if (const ReferenceType *Ref = ExprTy->getAs<ReferenceType>())
2786 ExprTy = Ref->getPointeeType();
2787
2788 if (CheckObjCTraitOperandConstraints(*this, ExprTy, Op->getExprLoc(),
2789 Op->getSourceRange(), ExprKind))
2790 return true;
2791
Nico Webercf739922011-06-15 02:47:03 +00002792 if (ExprKind == UETT_SizeOf) {
2793 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(Op->IgnoreParens())) {
2794 if (ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(DeclRef->getFoundDecl())) {
2795 QualType OType = PVD->getOriginalType();
2796 QualType Type = PVD->getType();
2797 if (Type->isPointerType() && OType->isArrayType()) {
2798 Diag(Op->getExprLoc(), diag::warn_sizeof_array_param)
2799 << Type << OType;
2800 Diag(PVD->getLocation(), diag::note_declared_at);
2801 }
2802 }
2803 }
2804 }
2805
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002806 return false;
Chandler Carruth9d342d02011-05-26 08:53:10 +00002807}
2808
2809/// \brief Check the constraints on operands to unary expression and type
2810/// traits.
2811///
2812/// This will complete any types necessary, and validate the various constraints
2813/// on those operands.
2814///
Reid Spencer5f016e22007-07-11 17:01:13 +00002815/// The UsualUnaryConversions() function is *not* called by this routine.
Chandler Carruth9d342d02011-05-26 08:53:10 +00002816/// C99 6.3.2.1p[2-4] all state:
2817/// Except when it is the operand of the sizeof operator ...
2818///
2819/// C++ [expr.sizeof]p4
2820/// The lvalue-to-rvalue, array-to-pointer, and function-to-pointer
2821/// standard conversions are not applied to the operand of sizeof.
2822///
2823/// This policy is followed for all of the unary trait expressions.
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002824bool Sema::CheckUnaryExprOrTypeTraitOperand(QualType exprType,
2825 SourceLocation OpLoc,
2826 SourceRange ExprRange,
2827 UnaryExprOrTypeTrait ExprKind) {
Sebastian Redl28507842009-02-26 14:39:58 +00002828 if (exprType->isDependentType())
2829 return false;
2830
Sebastian Redl5d484e82009-11-23 17:18:46 +00002831 // C++ [expr.sizeof]p2: "When applied to a reference or a reference type,
2832 // the result is the size of the referenced type."
2833 // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the
2834 // result shall be the alignment of the referenced type."
2835 if (const ReferenceType *Ref = exprType->getAs<ReferenceType>())
2836 exprType = Ref->getPointeeType();
2837
Chandler Carruthdf1f3772011-05-26 08:53:12 +00002838 if (ExprKind == UETT_VecStep)
2839 return CheckVecStepTraitOperandType(*this, exprType, OpLoc, ExprRange);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002840
Chandler Carruth42ec65d2011-05-26 08:53:16 +00002841 // Whitelist some types as extensions
2842 if (!CheckExtensionTraitOperandType(*this, exprType, OpLoc, ExprRange,
2843 ExprKind))
Chris Lattner01072922009-01-24 19:46:37 +00002844 return false;
Mike Stump1eb44332009-09-09 15:08:12 +00002845
Chris Lattner1efaa952009-04-24 00:30:45 +00002846 if (RequireCompleteType(OpLoc, exprType,
Douglas Gregor5cc07df2009-12-15 16:44:32 +00002847 PDiag(diag::err_sizeof_alignof_incomplete_type)
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002848 << ExprKind << ExprRange))
Chris Lattner1efaa952009-04-24 00:30:45 +00002849 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00002850
Chandler Carruth42ec65d2011-05-26 08:53:16 +00002851 if (CheckObjCTraitOperandConstraints(*this, exprType, OpLoc, ExprRange,
2852 ExprKind))
Chris Lattner5cb10d32009-04-24 22:30:50 +00002853 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00002854
Chris Lattner1efaa952009-04-24 00:30:45 +00002855 return false;
Reid Spencer5f016e22007-07-11 17:01:13 +00002856}
2857
Chandler Carruth9d342d02011-05-26 08:53:10 +00002858static bool CheckAlignOfExpr(Sema &S, Expr *E) {
Chris Lattner31e21e02009-01-24 20:17:12 +00002859 E = E->IgnoreParens();
Sebastian Redl28507842009-02-26 14:39:58 +00002860
Mike Stump1eb44332009-09-09 15:08:12 +00002861 // alignof decl is always ok.
Chris Lattner31e21e02009-01-24 20:17:12 +00002862 if (isa<DeclRefExpr>(E))
2863 return false;
Sebastian Redl28507842009-02-26 14:39:58 +00002864
2865 // Cannot know anything else if the expression is dependent.
2866 if (E->isTypeDependent())
2867 return false;
2868
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002869 if (E->getBitField()) {
Chandler Carruth9d342d02011-05-26 08:53:10 +00002870 S.Diag(E->getExprLoc(), diag::err_sizeof_alignof_bitfield)
2871 << 1 << E->getSourceRange();
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002872 return true;
Chris Lattner31e21e02009-01-24 20:17:12 +00002873 }
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002874
2875 // Alignment of a field access is always okay, so long as it isn't a
2876 // bit-field.
2877 if (MemberExpr *ME = dyn_cast<MemberExpr>(E))
Mike Stump8e1fab22009-07-22 18:58:19 +00002878 if (isa<FieldDecl>(ME->getMemberDecl()))
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002879 return false;
2880
Chandler Carruth9d342d02011-05-26 08:53:10 +00002881 return S.CheckUnaryExprOrTypeTraitOperand(E, UETT_AlignOf);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002882}
2883
Chandler Carruth9d342d02011-05-26 08:53:10 +00002884bool Sema::CheckVecStepExpr(Expr *E) {
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002885 E = E->IgnoreParens();
2886
2887 // Cannot know anything else if the expression is dependent.
2888 if (E->isTypeDependent())
2889 return false;
2890
Chandler Carruth9d342d02011-05-26 08:53:10 +00002891 return CheckUnaryExprOrTypeTraitOperand(E, UETT_VecStep);
Chris Lattner31e21e02009-01-24 20:17:12 +00002892}
2893
Douglas Gregorba498172009-03-13 21:01:28 +00002894/// \brief Build a sizeof or alignof expression given a type operand.
John McCall60d7b3a2010-08-24 06:29:42 +00002895ExprResult
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002896Sema::CreateUnaryExprOrTypeTraitExpr(TypeSourceInfo *TInfo,
2897 SourceLocation OpLoc,
2898 UnaryExprOrTypeTrait ExprKind,
2899 SourceRange R) {
John McCalla93c9342009-12-07 02:54:59 +00002900 if (!TInfo)
Douglas Gregorba498172009-03-13 21:01:28 +00002901 return ExprError();
2902
John McCalla93c9342009-12-07 02:54:59 +00002903 QualType T = TInfo->getType();
John McCall5ab75172009-11-04 07:28:41 +00002904
Douglas Gregorba498172009-03-13 21:01:28 +00002905 if (!T->isDependentType() &&
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002906 CheckUnaryExprOrTypeTraitOperand(T, OpLoc, R, ExprKind))
Douglas Gregorba498172009-03-13 21:01:28 +00002907 return ExprError();
2908
2909 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002910 return Owned(new (Context) UnaryExprOrTypeTraitExpr(ExprKind, TInfo,
2911 Context.getSizeType(),
2912 OpLoc, R.getEnd()));
Douglas Gregorba498172009-03-13 21:01:28 +00002913}
2914
2915/// \brief Build a sizeof or alignof expression given an expression
2916/// operand.
John McCall60d7b3a2010-08-24 06:29:42 +00002917ExprResult
Chandler Carruthe72c55b2011-05-29 07:32:14 +00002918Sema::CreateUnaryExprOrTypeTraitExpr(Expr *E, SourceLocation OpLoc,
2919 UnaryExprOrTypeTrait ExprKind) {
Douglas Gregor4f0845e2011-06-22 23:21:00 +00002920 ExprResult PE = CheckPlaceholderExpr(E);
2921 if (PE.isInvalid())
2922 return ExprError();
2923
2924 E = PE.get();
2925
Douglas Gregorba498172009-03-13 21:01:28 +00002926 // Verify that the operand is valid.
2927 bool isInvalid = false;
2928 if (E->isTypeDependent()) {
2929 // Delay type-checking for type-dependent expressions.
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002930 } else if (ExprKind == UETT_AlignOf) {
Chandler Carruth9d342d02011-05-26 08:53:10 +00002931 isInvalid = CheckAlignOfExpr(*this, E);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002932 } else if (ExprKind == UETT_VecStep) {
Chandler Carruth9d342d02011-05-26 08:53:10 +00002933 isInvalid = CheckVecStepExpr(E);
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002934 } else if (E->getBitField()) { // C99 6.5.3.4p1.
Chandler Carruth9d342d02011-05-26 08:53:10 +00002935 Diag(E->getExprLoc(), diag::err_sizeof_alignof_bitfield) << 0;
Douglas Gregorba498172009-03-13 21:01:28 +00002936 isInvalid = true;
2937 } else {
Chandler Carruth9d342d02011-05-26 08:53:10 +00002938 isInvalid = CheckUnaryExprOrTypeTraitOperand(E, UETT_SizeOf);
Douglas Gregorba498172009-03-13 21:01:28 +00002939 }
2940
2941 if (isInvalid)
2942 return ExprError();
2943
2944 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
Chandler Carruth9d342d02011-05-26 08:53:10 +00002945 return Owned(new (Context) UnaryExprOrTypeTraitExpr(
Chandler Carruthe72c55b2011-05-29 07:32:14 +00002946 ExprKind, E, Context.getSizeType(), OpLoc,
Chandler Carruth9d342d02011-05-26 08:53:10 +00002947 E->getSourceRange().getEnd()));
Douglas Gregorba498172009-03-13 21:01:28 +00002948}
2949
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002950/// ActOnUnaryExprOrTypeTraitExpr - Handle @c sizeof(type) and @c sizeof @c
2951/// expr and the same for @c alignof and @c __alignof
Sebastian Redl05189992008-11-11 17:56:53 +00002952/// Note that the ArgRange is invalid if isType is false.
John McCall60d7b3a2010-08-24 06:29:42 +00002953ExprResult
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002954Sema::ActOnUnaryExprOrTypeTraitExpr(SourceLocation OpLoc,
2955 UnaryExprOrTypeTrait ExprKind, bool isType,
2956 void *TyOrEx, const SourceRange &ArgRange) {
Reid Spencer5f016e22007-07-11 17:01:13 +00002957 // If error parsing type, ignore.
Sebastian Redl0eb23302009-01-19 00:08:26 +00002958 if (TyOrEx == 0) return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00002959
Sebastian Redl05189992008-11-11 17:56:53 +00002960 if (isType) {
John McCalla93c9342009-12-07 02:54:59 +00002961 TypeSourceInfo *TInfo;
John McCallb3d87482010-08-24 05:47:05 +00002962 (void) GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrEx), &TInfo);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002963 return CreateUnaryExprOrTypeTraitExpr(TInfo, OpLoc, ExprKind, ArgRange);
Mike Stump1eb44332009-09-09 15:08:12 +00002964 }
Sebastian Redl05189992008-11-11 17:56:53 +00002965
Douglas Gregorba498172009-03-13 21:01:28 +00002966 Expr *ArgEx = (Expr *)TyOrEx;
Chandler Carruthe72c55b2011-05-29 07:32:14 +00002967 ExprResult Result = CreateUnaryExprOrTypeTraitExpr(ArgEx, OpLoc, ExprKind);
Douglas Gregorba498172009-03-13 21:01:28 +00002968 return move(Result);
Reid Spencer5f016e22007-07-11 17:01:13 +00002969}
2970
John Wiegley429bb272011-04-08 18:41:53 +00002971static QualType CheckRealImagOperand(Sema &S, ExprResult &V, SourceLocation Loc,
John McCall09431682010-11-18 19:01:18 +00002972 bool isReal) {
John Wiegley429bb272011-04-08 18:41:53 +00002973 if (V.get()->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00002974 return S.Context.DependentTy;
Mike Stump1eb44332009-09-09 15:08:12 +00002975
John McCallf6a16482010-12-04 03:47:34 +00002976 // _Real and _Imag are only l-values for normal l-values.
John Wiegley429bb272011-04-08 18:41:53 +00002977 if (V.get()->getObjectKind() != OK_Ordinary) {
2978 V = S.DefaultLvalueConversion(V.take());
2979 if (V.isInvalid())
2980 return QualType();
2981 }
John McCallf6a16482010-12-04 03:47:34 +00002982
Chris Lattnercc26ed72007-08-26 05:39:26 +00002983 // These operators return the element type of a complex type.
John Wiegley429bb272011-04-08 18:41:53 +00002984 if (const ComplexType *CT = V.get()->getType()->getAs<ComplexType>())
Chris Lattnerdbb36972007-08-24 21:16:53 +00002985 return CT->getElementType();
Mike Stump1eb44332009-09-09 15:08:12 +00002986
Chris Lattnercc26ed72007-08-26 05:39:26 +00002987 // Otherwise they pass through real integer and floating point types here.
John Wiegley429bb272011-04-08 18:41:53 +00002988 if (V.get()->getType()->isArithmeticType())
2989 return V.get()->getType();
Mike Stump1eb44332009-09-09 15:08:12 +00002990
John McCall2cd11fe2010-10-12 02:09:17 +00002991 // Test for placeholders.
John McCallfb8721c2011-04-10 19:13:55 +00002992 ExprResult PR = S.CheckPlaceholderExpr(V.get());
John McCall2cd11fe2010-10-12 02:09:17 +00002993 if (PR.isInvalid()) return QualType();
John Wiegley429bb272011-04-08 18:41:53 +00002994 if (PR.get() != V.get()) {
2995 V = move(PR);
John McCall09431682010-11-18 19:01:18 +00002996 return CheckRealImagOperand(S, V, Loc, isReal);
John McCall2cd11fe2010-10-12 02:09:17 +00002997 }
2998
Chris Lattnercc26ed72007-08-26 05:39:26 +00002999 // Reject anything else.
John Wiegley429bb272011-04-08 18:41:53 +00003000 S.Diag(Loc, diag::err_realimag_invalid_type) << V.get()->getType()
Chris Lattnerba27e2a2009-02-17 08:12:06 +00003001 << (isReal ? "__real" : "__imag");
Chris Lattnercc26ed72007-08-26 05:39:26 +00003002 return QualType();
Chris Lattnerdbb36972007-08-24 21:16:53 +00003003}
3004
3005
Reid Spencer5f016e22007-07-11 17:01:13 +00003006
John McCall60d7b3a2010-08-24 06:29:42 +00003007ExprResult
Sebastian Redl0eb23302009-01-19 00:08:26 +00003008Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc,
John McCall9ae2f072010-08-23 23:25:46 +00003009 tok::TokenKind Kind, Expr *Input) {
John McCall2de56d12010-08-25 11:45:40 +00003010 UnaryOperatorKind Opc;
Reid Spencer5f016e22007-07-11 17:01:13 +00003011 switch (Kind) {
3012 default: assert(0 && "Unknown unary op!");
John McCall2de56d12010-08-25 11:45:40 +00003013 case tok::plusplus: Opc = UO_PostInc; break;
3014 case tok::minusminus: Opc = UO_PostDec; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00003015 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00003016
John McCall9ae2f072010-08-23 23:25:46 +00003017 return BuildUnaryOp(S, OpLoc, Opc, Input);
Reid Spencer5f016e22007-07-11 17:01:13 +00003018}
3019
John McCall60d7b3a2010-08-24 06:29:42 +00003020ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003021Sema::ActOnArraySubscriptExpr(Scope *S, Expr *Base, SourceLocation LLoc,
3022 Expr *Idx, SourceLocation RLoc) {
Nate Begeman2ef13e52009-08-10 23:49:36 +00003023 // Since this might be a postfix expression, get rid of ParenListExprs.
John McCall60d7b3a2010-08-24 06:29:42 +00003024 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base);
John McCall9ae2f072010-08-23 23:25:46 +00003025 if (Result.isInvalid()) return ExprError();
3026 Base = Result.take();
Nate Begeman2ef13e52009-08-10 23:49:36 +00003027
John McCall9ae2f072010-08-23 23:25:46 +00003028 Expr *LHSExp = Base, *RHSExp = Idx;
Mike Stump1eb44332009-09-09 15:08:12 +00003029
Douglas Gregor337c6b92008-11-19 17:17:41 +00003030 if (getLangOptions().CPlusPlus &&
Douglas Gregor3384c9c2009-05-19 00:01:19 +00003031 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) {
Douglas Gregor3384c9c2009-05-19 00:01:19 +00003032 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp,
John McCallf89e55a2010-11-18 06:31:45 +00003033 Context.DependentTy,
3034 VK_LValue, OK_Ordinary,
3035 RLoc));
Douglas Gregor3384c9c2009-05-19 00:01:19 +00003036 }
3037
Mike Stump1eb44332009-09-09 15:08:12 +00003038 if (getLangOptions().CPlusPlus &&
Sebastian Redl0eb23302009-01-19 00:08:26 +00003039 (LHSExp->getType()->isRecordType() ||
Eli Friedman03f332a2008-12-15 22:34:21 +00003040 LHSExp->getType()->isEnumeralType() ||
3041 RHSExp->getType()->isRecordType() ||
3042 RHSExp->getType()->isEnumeralType())) {
John McCall9ae2f072010-08-23 23:25:46 +00003043 return CreateOverloadedArraySubscriptExpr(LLoc, RLoc, Base, Idx);
Douglas Gregor337c6b92008-11-19 17:17:41 +00003044 }
3045
John McCall9ae2f072010-08-23 23:25:46 +00003046 return CreateBuiltinArraySubscriptExpr(Base, LLoc, Idx, RLoc);
Sebastian Redlf322ed62009-10-29 20:17:01 +00003047}
3048
3049
John McCall60d7b3a2010-08-24 06:29:42 +00003050ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003051Sema::CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc,
3052 Expr *Idx, SourceLocation RLoc) {
3053 Expr *LHSExp = Base;
3054 Expr *RHSExp = Idx;
Sebastian Redlf322ed62009-10-29 20:17:01 +00003055
Chris Lattner12d9ff62007-07-16 00:14:47 +00003056 // Perform default conversions.
John Wiegley429bb272011-04-08 18:41:53 +00003057 if (!LHSExp->getType()->getAs<VectorType>()) {
3058 ExprResult Result = DefaultFunctionArrayLvalueConversion(LHSExp);
3059 if (Result.isInvalid())
3060 return ExprError();
3061 LHSExp = Result.take();
3062 }
3063 ExprResult Result = DefaultFunctionArrayLvalueConversion(RHSExp);
3064 if (Result.isInvalid())
3065 return ExprError();
3066 RHSExp = Result.take();
Sebastian Redl0eb23302009-01-19 00:08:26 +00003067
Chris Lattner12d9ff62007-07-16 00:14:47 +00003068 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType();
John McCallf89e55a2010-11-18 06:31:45 +00003069 ExprValueKind VK = VK_LValue;
3070 ExprObjectKind OK = OK_Ordinary;
Reid Spencer5f016e22007-07-11 17:01:13 +00003071
Reid Spencer5f016e22007-07-11 17:01:13 +00003072 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent
Chris Lattner73d0d4f2007-08-30 17:45:32 +00003073 // to the expression *((e1)+(e2)). This means the array "Base" may actually be
Mike Stumpeed9cac2009-02-19 03:04:26 +00003074 // in the subscript position. As a result, we need to derive the array base
Reid Spencer5f016e22007-07-11 17:01:13 +00003075 // and index from the expression types.
Chris Lattner12d9ff62007-07-16 00:14:47 +00003076 Expr *BaseExpr, *IndexExpr;
3077 QualType ResultType;
Sebastian Redl28507842009-02-26 14:39:58 +00003078 if (LHSTy->isDependentType() || RHSTy->isDependentType()) {
3079 BaseExpr = LHSExp;
3080 IndexExpr = RHSExp;
3081 ResultType = Context.DependentTy;
Ted Kremenek6217b802009-07-29 21:53:49 +00003082 } else if (const PointerType *PTy = LHSTy->getAs<PointerType>()) {
Chris Lattner12d9ff62007-07-16 00:14:47 +00003083 BaseExpr = LHSExp;
3084 IndexExpr = RHSExp;
Chris Lattner12d9ff62007-07-16 00:14:47 +00003085 ResultType = PTy->getPointeeType();
Ted Kremenek6217b802009-07-29 21:53:49 +00003086 } else if (const PointerType *PTy = RHSTy->getAs<PointerType>()) {
Chris Lattner7a2e0472007-07-16 00:23:25 +00003087 // Handle the uncommon case of "123[Ptr]".
Chris Lattner12d9ff62007-07-16 00:14:47 +00003088 BaseExpr = RHSExp;
3089 IndexExpr = LHSExp;
Chris Lattner12d9ff62007-07-16 00:14:47 +00003090 ResultType = PTy->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00003091 } else if (const ObjCObjectPointerType *PTy =
John McCall183700f2009-09-21 23:43:11 +00003092 LHSTy->getAs<ObjCObjectPointerType>()) {
Steve Naroff14108da2009-07-10 23:34:53 +00003093 BaseExpr = LHSExp;
3094 IndexExpr = RHSExp;
3095 ResultType = PTy->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00003096 } else if (const ObjCObjectPointerType *PTy =
John McCall183700f2009-09-21 23:43:11 +00003097 RHSTy->getAs<ObjCObjectPointerType>()) {
Steve Naroff14108da2009-07-10 23:34:53 +00003098 // Handle the uncommon case of "123[Ptr]".
3099 BaseExpr = RHSExp;
3100 IndexExpr = LHSExp;
3101 ResultType = PTy->getPointeeType();
John McCall183700f2009-09-21 23:43:11 +00003102 } else if (const VectorType *VTy = LHSTy->getAs<VectorType>()) {
Chris Lattnerc8629632007-07-31 19:29:30 +00003103 BaseExpr = LHSExp; // vectors: V[123]
Chris Lattner12d9ff62007-07-16 00:14:47 +00003104 IndexExpr = RHSExp;
John McCallf89e55a2010-11-18 06:31:45 +00003105 VK = LHSExp->getValueKind();
3106 if (VK != VK_RValue)
3107 OK = OK_VectorComponent;
Nate Begeman334a8022009-01-18 00:45:31 +00003108
Chris Lattner12d9ff62007-07-16 00:14:47 +00003109 // FIXME: need to deal with const...
3110 ResultType = VTy->getElementType();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003111 } else if (LHSTy->isArrayType()) {
3112 // If we see an array that wasn't promoted by
Douglas Gregora873dfc2010-02-03 00:27:59 +00003113 // DefaultFunctionArrayLvalueConversion, it must be an array that
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003114 // wasn't promoted because of the C90 rule that doesn't
3115 // allow promoting non-lvalue arrays. Warn, then
3116 // force the promotion here.
3117 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) <<
3118 LHSExp->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00003119 LHSExp = ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy),
3120 CK_ArrayToPointerDecay).take();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003121 LHSTy = LHSExp->getType();
3122
3123 BaseExpr = LHSExp;
3124 IndexExpr = RHSExp;
Ted Kremenek6217b802009-07-29 21:53:49 +00003125 ResultType = LHSTy->getAs<PointerType>()->getPointeeType();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003126 } else if (RHSTy->isArrayType()) {
3127 // Same as previous, except for 123[f().a] case
3128 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) <<
3129 RHSExp->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00003130 RHSExp = ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy),
3131 CK_ArrayToPointerDecay).take();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003132 RHSTy = RHSExp->getType();
3133
3134 BaseExpr = RHSExp;
3135 IndexExpr = LHSExp;
Ted Kremenek6217b802009-07-29 21:53:49 +00003136 ResultType = RHSTy->getAs<PointerType>()->getPointeeType();
Reid Spencer5f016e22007-07-11 17:01:13 +00003137 } else {
Chris Lattner338395d2009-04-25 22:50:55 +00003138 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value)
3139 << LHSExp->getSourceRange() << RHSExp->getSourceRange());
Sebastian Redl0eb23302009-01-19 00:08:26 +00003140 }
Reid Spencer5f016e22007-07-11 17:01:13 +00003141 // C99 6.5.2.1p1
Douglas Gregorf6094622010-07-23 15:58:24 +00003142 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent())
Chris Lattner338395d2009-04-25 22:50:55 +00003143 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer)
3144 << IndexExpr->getSourceRange());
Reid Spencer5f016e22007-07-11 17:01:13 +00003145
Daniel Dunbar7e88a602009-09-17 06:31:17 +00003146 if ((IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
Sam Weinig0f9a5b52009-09-14 20:14:57 +00003147 IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
3148 && !IndexExpr->isTypeDependent())
Sam Weinig76e2b712009-09-14 01:58:58 +00003149 Diag(LLoc, diag::warn_subscript_is_char) << IndexExpr->getSourceRange();
3150
Douglas Gregore7450f52009-03-24 19:52:54 +00003151 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly,
Mike Stump1eb44332009-09-09 15:08:12 +00003152 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object
3153 // type. Note that Functions are not objects, and that (in C99 parlance)
Douglas Gregore7450f52009-03-24 19:52:54 +00003154 // incomplete types are not object types.
3155 if (ResultType->isFunctionType()) {
3156 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type)
3157 << ResultType << BaseExpr->getSourceRange();
3158 return ExprError();
3159 }
Mike Stump1eb44332009-09-09 15:08:12 +00003160
Abramo Bagnara46358452010-09-13 06:50:07 +00003161 if (ResultType->isVoidType() && !getLangOptions().CPlusPlus) {
3162 // GNU extension: subscripting on pointer to void
Chandler Carruth66289692011-06-27 16:32:27 +00003163 Diag(LLoc, diag::ext_gnu_subscript_void_type)
3164 << BaseExpr->getSourceRange();
John McCall09431682010-11-18 19:01:18 +00003165
3166 // C forbids expressions of unqualified void type from being l-values.
3167 // See IsCForbiddenLValueType.
3168 if (!ResultType.hasQualifiers()) VK = VK_RValue;
Abramo Bagnara46358452010-09-13 06:50:07 +00003169 } else if (!ResultType->isDependentType() &&
Mike Stump1eb44332009-09-09 15:08:12 +00003170 RequireCompleteType(LLoc, ResultType,
Anders Carlssonb7906612009-08-26 23:45:07 +00003171 PDiag(diag::err_subscript_incomplete_type)
3172 << BaseExpr->getSourceRange()))
Douglas Gregore7450f52009-03-24 19:52:54 +00003173 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00003174
Chris Lattner1efaa952009-04-24 00:30:45 +00003175 // Diagnose bad cases where we step over interface counts.
John McCallc12c5bb2010-05-15 11:32:37 +00003176 if (ResultType->isObjCObjectType() && LangOpts.ObjCNonFragileABI) {
Chris Lattner1efaa952009-04-24 00:30:45 +00003177 Diag(LLoc, diag::err_subscript_nonfragile_interface)
3178 << ResultType << BaseExpr->getSourceRange();
3179 return ExprError();
3180 }
Mike Stump1eb44332009-09-09 15:08:12 +00003181
John McCall09431682010-11-18 19:01:18 +00003182 assert(VK == VK_RValue || LangOpts.CPlusPlus ||
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00003183 !ResultType.isCForbiddenLValueType());
John McCall09431682010-11-18 19:01:18 +00003184
Mike Stumpeed9cac2009-02-19 03:04:26 +00003185 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp,
John McCallf89e55a2010-11-18 06:31:45 +00003186 ResultType, VK, OK, RLoc));
Reid Spencer5f016e22007-07-11 17:01:13 +00003187}
3188
John McCall60d7b3a2010-08-24 06:29:42 +00003189ExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc,
Nico Weber08e41a62010-11-29 18:19:25 +00003190 FunctionDecl *FD,
3191 ParmVarDecl *Param) {
Anders Carlsson56c5e332009-08-25 03:49:14 +00003192 if (Param->hasUnparsedDefaultArg()) {
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003193 Diag(CallLoc,
Nico Weber15d5c832010-11-30 04:44:33 +00003194 diag::err_use_of_default_argument_to_function_declared_later) <<
Anders Carlsson56c5e332009-08-25 03:49:14 +00003195 FD << cast<CXXRecordDecl>(FD->getDeclContext())->getDeclName();
Mike Stump1eb44332009-09-09 15:08:12 +00003196 Diag(UnparsedDefaultArgLocs[Param],
Nico Weber15d5c832010-11-30 04:44:33 +00003197 diag::note_default_argument_declared_here);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003198 return ExprError();
3199 }
3200
3201 if (Param->hasUninstantiatedDefaultArg()) {
3202 Expr *UninstExpr = Param->getUninstantiatedDefaultArg();
Anders Carlsson56c5e332009-08-25 03:49:14 +00003203
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003204 // Instantiate the expression.
3205 MultiLevelTemplateArgumentList ArgList
3206 = getTemplateInstantiationArgs(FD, 0, /*RelativeToPrimary=*/true);
Anders Carlsson25cae7f2009-09-05 05:14:19 +00003207
Nico Weber08e41a62010-11-29 18:19:25 +00003208 std::pair<const TemplateArgument *, unsigned> Innermost
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003209 = ArgList.getInnermost();
3210 InstantiatingTemplate Inst(*this, CallLoc, Param, Innermost.first,
3211 Innermost.second);
Anders Carlsson56c5e332009-08-25 03:49:14 +00003212
Nico Weber08e41a62010-11-29 18:19:25 +00003213 ExprResult Result;
3214 {
3215 // C++ [dcl.fct.default]p5:
3216 // The names in the [default argument] expression are bound, and
3217 // the semantic constraints are checked, at the point where the
3218 // default argument expression appears.
Nico Weber15d5c832010-11-30 04:44:33 +00003219 ContextRAII SavedContext(*this, FD);
Nico Weber08e41a62010-11-29 18:19:25 +00003220 Result = SubstExpr(UninstExpr, ArgList);
3221 }
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003222 if (Result.isInvalid())
3223 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00003224
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003225 // Check the expression as an initializer for the parameter.
3226 InitializedEntity Entity
Fariborz Jahanian745da3a2010-09-24 17:30:16 +00003227 = InitializedEntity::InitializeParameter(Context, Param);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003228 InitializationKind Kind
3229 = InitializationKind::CreateCopy(Param->getLocation(),
3230 /*FIXME:EqualLoc*/UninstExpr->getSourceRange().getBegin());
3231 Expr *ResultE = Result.takeAs<Expr>();
Douglas Gregor65222e82009-12-23 18:19:08 +00003232
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003233 InitializationSequence InitSeq(*this, Entity, Kind, &ResultE, 1);
3234 Result = InitSeq.Perform(*this, Entity, Kind,
3235 MultiExprArg(*this, &ResultE, 1));
3236 if (Result.isInvalid())
3237 return ExprError();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003238
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003239 // Build the default argument expression.
3240 return Owned(CXXDefaultArgExpr::Create(Context, CallLoc, Param,
3241 Result.takeAs<Expr>()));
Anders Carlsson56c5e332009-08-25 03:49:14 +00003242 }
3243
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003244 // If the default expression creates temporaries, we need to
3245 // push them to the current stack of expression temporaries so they'll
3246 // be properly destroyed.
3247 // FIXME: We should really be rebuilding the default argument with new
3248 // bound temporaries; see the comment in PR5810.
Douglas Gregor5833b0b2010-09-14 22:55:20 +00003249 for (unsigned i = 0, e = Param->getNumDefaultArgTemporaries(); i != e; ++i) {
3250 CXXTemporary *Temporary = Param->getDefaultArgTemporary(i);
3251 MarkDeclarationReferenced(Param->getDefaultArg()->getLocStart(),
3252 const_cast<CXXDestructorDecl*>(Temporary->getDestructor()));
3253 ExprTemporaries.push_back(Temporary);
John McCallf85e1932011-06-15 23:02:42 +00003254 ExprNeedsCleanups = true;
Douglas Gregor5833b0b2010-09-14 22:55:20 +00003255 }
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003256
3257 // We already type-checked the argument, so we know it works.
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00003258 // Just mark all of the declarations in this potentially-evaluated expression
3259 // as being "referenced".
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003260 MarkDeclarationsReferencedInExpr(Param->getDefaultArg());
Douglas Gregor036aed12009-12-23 23:03:06 +00003261 return Owned(CXXDefaultArgExpr::Create(Context, CallLoc, Param));
Anders Carlsson56c5e332009-08-25 03:49:14 +00003262}
3263
Douglas Gregor88a35142008-12-22 05:46:06 +00003264/// ConvertArgumentsForCall - Converts the arguments specified in
3265/// Args/NumArgs to the parameter types of the function FDecl with
3266/// function prototype Proto. Call is the call expression itself, and
3267/// Fn is the function expression. For a C++ member function, this
3268/// routine does not attempt to convert the object argument. Returns
3269/// true if the call is ill-formed.
Mike Stumpeed9cac2009-02-19 03:04:26 +00003270bool
3271Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn,
Douglas Gregor88a35142008-12-22 05:46:06 +00003272 FunctionDecl *FDecl,
Douglas Gregor72564e72009-02-26 23:50:07 +00003273 const FunctionProtoType *Proto,
Douglas Gregor88a35142008-12-22 05:46:06 +00003274 Expr **Args, unsigned NumArgs,
3275 SourceLocation RParenLoc) {
John McCall8e10f3b2011-02-26 05:39:39 +00003276 // Bail out early if calling a builtin with custom typechecking.
3277 // We don't need to do this in the
3278 if (FDecl)
3279 if (unsigned ID = FDecl->getBuiltinID())
3280 if (Context.BuiltinInfo.hasCustomTypechecking(ID))
3281 return false;
3282
Mike Stumpeed9cac2009-02-19 03:04:26 +00003283 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by
Douglas Gregor88a35142008-12-22 05:46:06 +00003284 // assignment, to the types of the corresponding parameter, ...
3285 unsigned NumArgsInProto = Proto->getNumArgs();
Douglas Gregor3fd56d72009-01-23 21:30:56 +00003286 bool Invalid = false;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003287
Douglas Gregor88a35142008-12-22 05:46:06 +00003288 // If too few arguments are available (and we don't have default
3289 // arguments for the remaining parameters), don't make the call.
3290 if (NumArgs < NumArgsInProto) {
Peter Collingbourne9aab1482011-07-29 00:24:42 +00003291 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) {
3292 Diag(RParenLoc, diag::err_typecheck_call_too_few_args)
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00003293 << Fn->getType()->isBlockPointerType()
Eric Christopherd77b9a22010-04-16 04:48:22 +00003294 << NumArgsInProto << NumArgs << Fn->getSourceRange();
Peter Collingbourne9aab1482011-07-29 00:24:42 +00003295
3296 // Emit the location of the prototype.
3297 if (FDecl && !FDecl->getBuiltinID())
3298 Diag(FDecl->getLocStart(), diag::note_callee_decl)
3299 << FDecl;
3300
3301 return true;
3302 }
Ted Kremenek8189cde2009-02-07 01:47:29 +00003303 Call->setNumArgs(Context, NumArgsInProto);
Douglas Gregor88a35142008-12-22 05:46:06 +00003304 }
3305
3306 // If too many are passed and not variadic, error on the extras and drop
3307 // them.
3308 if (NumArgs > NumArgsInProto) {
3309 if (!Proto->isVariadic()) {
3310 Diag(Args[NumArgsInProto]->getLocStart(),
3311 diag::err_typecheck_call_too_many_args)
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00003312 << Fn->getType()->isBlockPointerType()
Eric Christopherccfa9632010-04-16 04:56:46 +00003313 << NumArgsInProto << NumArgs << Fn->getSourceRange()
Douglas Gregor88a35142008-12-22 05:46:06 +00003314 << SourceRange(Args[NumArgsInProto]->getLocStart(),
3315 Args[NumArgs-1]->getLocEnd());
Ted Kremenek5862f0e2011-04-04 17:22:27 +00003316
3317 // Emit the location of the prototype.
3318 if (FDecl && !FDecl->getBuiltinID())
Peter Collingbourne9aab1482011-07-29 00:24:42 +00003319 Diag(FDecl->getLocStart(), diag::note_callee_decl)
3320 << FDecl;
Ted Kremenek5862f0e2011-04-04 17:22:27 +00003321
Douglas Gregor88a35142008-12-22 05:46:06 +00003322 // This deletes the extra arguments.
Ted Kremenek8189cde2009-02-07 01:47:29 +00003323 Call->setNumArgs(Context, NumArgsInProto);
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003324 return true;
Douglas Gregor88a35142008-12-22 05:46:06 +00003325 }
Douglas Gregor88a35142008-12-22 05:46:06 +00003326 }
Chris Lattner5f9e2722011-07-23 10:55:15 +00003327 SmallVector<Expr *, 8> AllArgs;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003328 VariadicCallType CallType =
Fariborz Jahanian4cd1c702009-11-24 19:27:49 +00003329 Proto->isVariadic() ? VariadicFunction : VariadicDoesNotApply;
3330 if (Fn->getType()->isBlockPointerType())
3331 CallType = VariadicBlock; // Block
3332 else if (isa<MemberExpr>(Fn))
3333 CallType = VariadicMethod;
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003334 Invalid = GatherArgumentsForCall(Call->getSourceRange().getBegin(), FDecl,
Fariborz Jahanian2fe168f2009-11-24 21:37:28 +00003335 Proto, 0, Args, NumArgs, AllArgs, CallType);
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003336 if (Invalid)
3337 return true;
3338 unsigned TotalNumArgs = AllArgs.size();
3339 for (unsigned i = 0; i < TotalNumArgs; ++i)
3340 Call->setArg(i, AllArgs[i]);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003341
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003342 return false;
3343}
Mike Stumpeed9cac2009-02-19 03:04:26 +00003344
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003345bool Sema::GatherArgumentsForCall(SourceLocation CallLoc,
3346 FunctionDecl *FDecl,
3347 const FunctionProtoType *Proto,
3348 unsigned FirstProtoArg,
3349 Expr **Args, unsigned NumArgs,
Chris Lattner5f9e2722011-07-23 10:55:15 +00003350 SmallVector<Expr *, 8> &AllArgs,
Fariborz Jahanian4cd1c702009-11-24 19:27:49 +00003351 VariadicCallType CallType) {
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003352 unsigned NumArgsInProto = Proto->getNumArgs();
3353 unsigned NumArgsToCheck = NumArgs;
3354 bool Invalid = false;
3355 if (NumArgs != NumArgsInProto)
3356 // Use default arguments for missing arguments
3357 NumArgsToCheck = NumArgsInProto;
3358 unsigned ArgIx = 0;
Douglas Gregor88a35142008-12-22 05:46:06 +00003359 // Continue to check argument types (even if we have too few/many args).
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003360 for (unsigned i = FirstProtoArg; i != NumArgsToCheck; i++) {
Douglas Gregor88a35142008-12-22 05:46:06 +00003361 QualType ProtoArgType = Proto->getArgType(i);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003362
Douglas Gregor88a35142008-12-22 05:46:06 +00003363 Expr *Arg;
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003364 if (ArgIx < NumArgs) {
3365 Arg = Args[ArgIx++];
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003366
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00003367 if (RequireCompleteType(Arg->getSourceRange().getBegin(),
3368 ProtoArgType,
Anders Carlssonb7906612009-08-26 23:45:07 +00003369 PDiag(diag::err_call_incomplete_argument)
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003370 << Arg->getSourceRange()))
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00003371 return true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003372
Douglas Gregora188ff22009-12-22 16:09:06 +00003373 // Pass the argument
3374 ParmVarDecl *Param = 0;
3375 if (FDecl && i < FDecl->getNumParams())
3376 Param = FDecl->getParamDecl(i);
Douglas Gregoraa037312009-12-22 07:24:36 +00003377
Douglas Gregora188ff22009-12-22 16:09:06 +00003378 InitializedEntity Entity =
Fariborz Jahanian745da3a2010-09-24 17:30:16 +00003379 Param? InitializedEntity::InitializeParameter(Context, Param)
John McCallf85e1932011-06-15 23:02:42 +00003380 : InitializedEntity::InitializeParameter(Context, ProtoArgType,
3381 Proto->isArgConsumed(i));
John McCall60d7b3a2010-08-24 06:29:42 +00003382 ExprResult ArgE = PerformCopyInitialization(Entity,
John McCallf6a16482010-12-04 03:47:34 +00003383 SourceLocation(),
3384 Owned(Arg));
Douglas Gregora188ff22009-12-22 16:09:06 +00003385 if (ArgE.isInvalid())
3386 return true;
3387
3388 Arg = ArgE.takeAs<Expr>();
Anders Carlsson5e300d12009-06-12 16:51:40 +00003389 } else {
Anders Carlssoned961f92009-08-25 02:29:20 +00003390 ParmVarDecl *Param = FDecl->getParamDecl(i);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003391
John McCall60d7b3a2010-08-24 06:29:42 +00003392 ExprResult ArgExpr =
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003393 BuildCXXDefaultArgExpr(CallLoc, FDecl, Param);
Anders Carlsson56c5e332009-08-25 03:49:14 +00003394 if (ArgExpr.isInvalid())
3395 return true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003396
Anders Carlsson56c5e332009-08-25 03:49:14 +00003397 Arg = ArgExpr.takeAs<Expr>();
Anders Carlsson5e300d12009-06-12 16:51:40 +00003398 }
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00003399
3400 // Check for array bounds violations for each argument to the call. This
3401 // check only triggers warnings when the argument isn't a more complex Expr
3402 // with its own checking, such as a BinaryOperator.
3403 CheckArrayAccess(Arg);
3404
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003405 AllArgs.push_back(Arg);
Douglas Gregor88a35142008-12-22 05:46:06 +00003406 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003407
Douglas Gregor88a35142008-12-22 05:46:06 +00003408 // If this is a variadic call, handle args passed through "...".
Fariborz Jahanian4cd1c702009-11-24 19:27:49 +00003409 if (CallType != VariadicDoesNotApply) {
John McCall755d8492011-04-12 00:42:48 +00003410
3411 // Assume that extern "C" functions with variadic arguments that
3412 // return __unknown_anytype aren't *really* variadic.
3413 if (Proto->getResultType() == Context.UnknownAnyTy &&
3414 FDecl && FDecl->isExternC()) {
3415 for (unsigned i = ArgIx; i != NumArgs; ++i) {
3416 ExprResult arg;
3417 if (isa<ExplicitCastExpr>(Args[i]->IgnoreParens()))
3418 arg = DefaultFunctionArrayLvalueConversion(Args[i]);
3419 else
3420 arg = DefaultVariadicArgumentPromotion(Args[i], CallType, FDecl);
3421 Invalid |= arg.isInvalid();
3422 AllArgs.push_back(arg.take());
3423 }
3424
3425 // Otherwise do argument promotion, (C99 6.5.2.2p7).
3426 } else {
3427 for (unsigned i = ArgIx; i != NumArgs; ++i) {
Richard Trieu67e29332011-08-02 04:35:43 +00003428 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], CallType,
3429 FDecl);
John McCall755d8492011-04-12 00:42:48 +00003430 Invalid |= Arg.isInvalid();
3431 AllArgs.push_back(Arg.take());
3432 }
Douglas Gregor88a35142008-12-22 05:46:06 +00003433 }
3434 }
Douglas Gregor3fd56d72009-01-23 21:30:56 +00003435 return Invalid;
Douglas Gregor88a35142008-12-22 05:46:06 +00003436}
3437
John McCall755d8492011-04-12 00:42:48 +00003438/// Given a function expression of unknown-any type, try to rebuild it
3439/// to have a function type.
3440static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *fn);
3441
Steve Narofff69936d2007-09-16 03:34:24 +00003442/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments.
Reid Spencer5f016e22007-07-11 17:01:13 +00003443/// This provides the location of the left/right parens and a list of comma
3444/// locations.
John McCall60d7b3a2010-08-24 06:29:42 +00003445ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003446Sema::ActOnCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc,
Peter Collingbournee08ce652011-02-09 21:07:24 +00003447 MultiExprArg args, SourceLocation RParenLoc,
3448 Expr *ExecConfig) {
Sebastian Redl0eb23302009-01-19 00:08:26 +00003449 unsigned NumArgs = args.size();
Nate Begeman2ef13e52009-08-10 23:49:36 +00003450
3451 // Since this might be a postfix expression, get rid of ParenListExprs.
John McCall60d7b3a2010-08-24 06:29:42 +00003452 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Fn);
John McCall9ae2f072010-08-23 23:25:46 +00003453 if (Result.isInvalid()) return ExprError();
3454 Fn = Result.take();
Mike Stump1eb44332009-09-09 15:08:12 +00003455
John McCall9ae2f072010-08-23 23:25:46 +00003456 Expr **Args = args.release();
Mike Stump1eb44332009-09-09 15:08:12 +00003457
Douglas Gregor88a35142008-12-22 05:46:06 +00003458 if (getLangOptions().CPlusPlus) {
Douglas Gregora71d8192009-09-04 17:36:40 +00003459 // If this is a pseudo-destructor expression, build the call immediately.
3460 if (isa<CXXPseudoDestructorExpr>(Fn)) {
3461 if (NumArgs > 0) {
3462 // Pseudo-destructor calls should not have any arguments.
3463 Diag(Fn->getLocStart(), diag::err_pseudo_dtor_call_with_args)
Douglas Gregor849b2432010-03-31 17:46:05 +00003464 << FixItHint::CreateRemoval(
Douglas Gregora71d8192009-09-04 17:36:40 +00003465 SourceRange(Args[0]->getLocStart(),
3466 Args[NumArgs-1]->getLocEnd()));
Mike Stump1eb44332009-09-09 15:08:12 +00003467
Douglas Gregora71d8192009-09-04 17:36:40 +00003468 NumArgs = 0;
3469 }
Mike Stump1eb44332009-09-09 15:08:12 +00003470
Douglas Gregora71d8192009-09-04 17:36:40 +00003471 return Owned(new (Context) CallExpr(Context, Fn, 0, 0, Context.VoidTy,
John McCallf89e55a2010-11-18 06:31:45 +00003472 VK_RValue, RParenLoc));
Douglas Gregora71d8192009-09-04 17:36:40 +00003473 }
Mike Stump1eb44332009-09-09 15:08:12 +00003474
Douglas Gregor17330012009-02-04 15:01:18 +00003475 // Determine whether this is a dependent call inside a C++ template,
Mike Stumpeed9cac2009-02-19 03:04:26 +00003476 // in which case we won't do any semantic analysis now.
Mike Stump390b4cc2009-05-16 07:39:55 +00003477 // FIXME: Will need to cache the results of name lookup (including ADL) in
3478 // Fn.
Douglas Gregor17330012009-02-04 15:01:18 +00003479 bool Dependent = false;
3480 if (Fn->isTypeDependent())
3481 Dependent = true;
3482 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs))
3483 Dependent = true;
3484
Peter Collingbournee08ce652011-02-09 21:07:24 +00003485 if (Dependent) {
3486 if (ExecConfig) {
3487 return Owned(new (Context) CUDAKernelCallExpr(
3488 Context, Fn, cast<CallExpr>(ExecConfig), Args, NumArgs,
3489 Context.DependentTy, VK_RValue, RParenLoc));
3490 } else {
3491 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs,
3492 Context.DependentTy, VK_RValue,
3493 RParenLoc));
3494 }
3495 }
Douglas Gregor17330012009-02-04 15:01:18 +00003496
3497 // Determine whether this is a call to an object (C++ [over.call.object]).
3498 if (Fn->getType()->isRecordType())
3499 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs,
Douglas Gregora1a04782010-09-09 16:33:13 +00003500 RParenLoc));
Douglas Gregor17330012009-02-04 15:01:18 +00003501
John McCall755d8492011-04-12 00:42:48 +00003502 if (Fn->getType() == Context.UnknownAnyTy) {
3503 ExprResult result = rebuildUnknownAnyFunction(*this, Fn);
3504 if (result.isInvalid()) return ExprError();
3505 Fn = result.take();
3506 }
3507
John McCall864c0412011-04-26 20:42:42 +00003508 if (Fn->getType() == Context.BoundMemberTy) {
John McCallaa81e162009-12-01 22:10:20 +00003509 return BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs,
Douglas Gregora1a04782010-09-09 16:33:13 +00003510 RParenLoc);
John McCall129e2df2009-11-30 22:42:35 +00003511 }
John McCall864c0412011-04-26 20:42:42 +00003512 }
John McCall129e2df2009-11-30 22:42:35 +00003513
John McCall864c0412011-04-26 20:42:42 +00003514 // Check for overloaded calls. This can happen even in C due to extensions.
3515 if (Fn->getType() == Context.OverloadTy) {
3516 OverloadExpr::FindResult find = OverloadExpr::find(Fn);
3517
3518 // We aren't supposed to apply this logic if there's an '&' involved.
3519 if (!find.IsAddressOfOperand) {
3520 OverloadExpr *ovl = find.Expression;
3521 if (isa<UnresolvedLookupExpr>(ovl)) {
3522 UnresolvedLookupExpr *ULE = cast<UnresolvedLookupExpr>(ovl);
3523 return BuildOverloadedCallExpr(S, Fn, ULE, LParenLoc, Args, NumArgs,
3524 RParenLoc, ExecConfig);
3525 } else {
John McCallaa81e162009-12-01 22:10:20 +00003526 return BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs,
Douglas Gregora1a04782010-09-09 16:33:13 +00003527 RParenLoc);
Anders Carlsson83ccfc32009-10-03 17:40:22 +00003528 }
3529 }
Douglas Gregor88a35142008-12-22 05:46:06 +00003530 }
3531
Douglas Gregorfa047642009-02-04 00:32:51 +00003532 // If we're directly calling a function, get the appropriate declaration.
Mike Stumpeed9cac2009-02-19 03:04:26 +00003533
Eli Friedmanefa42f72009-12-26 03:35:45 +00003534 Expr *NakedFn = Fn->IgnoreParens();
Douglas Gregoref9b1492010-11-09 20:03:54 +00003535
John McCall3b4294e2009-12-16 12:17:52 +00003536 NamedDecl *NDecl = 0;
Douglas Gregord8f0ade2010-10-25 20:48:33 +00003537 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(NakedFn))
3538 if (UnOp->getOpcode() == UO_AddrOf)
3539 NakedFn = UnOp->getSubExpr()->IgnoreParens();
3540
John McCall3b4294e2009-12-16 12:17:52 +00003541 if (isa<DeclRefExpr>(NakedFn))
3542 NDecl = cast<DeclRefExpr>(NakedFn)->getDecl();
John McCall864c0412011-04-26 20:42:42 +00003543 else if (isa<MemberExpr>(NakedFn))
3544 NDecl = cast<MemberExpr>(NakedFn)->getMemberDecl();
John McCall3b4294e2009-12-16 12:17:52 +00003545
Peter Collingbournee08ce652011-02-09 21:07:24 +00003546 return BuildResolvedCallExpr(Fn, NDecl, LParenLoc, Args, NumArgs, RParenLoc,
3547 ExecConfig);
3548}
3549
3550ExprResult
3551Sema::ActOnCUDAExecConfigExpr(Scope *S, SourceLocation LLLLoc,
3552 MultiExprArg execConfig, SourceLocation GGGLoc) {
3553 FunctionDecl *ConfigDecl = Context.getcudaConfigureCallDecl();
3554 if (!ConfigDecl)
3555 return ExprError(Diag(LLLLoc, diag::err_undeclared_var_use)
3556 << "cudaConfigureCall");
3557 QualType ConfigQTy = ConfigDecl->getType();
3558
3559 DeclRefExpr *ConfigDR = new (Context) DeclRefExpr(
3560 ConfigDecl, ConfigQTy, VK_LValue, LLLLoc);
3561
3562 return ActOnCallExpr(S, ConfigDR, LLLLoc, execConfig, GGGLoc, 0);
John McCallaa81e162009-12-01 22:10:20 +00003563}
3564
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003565/// ActOnAsTypeExpr - create a new asType (bitcast) from the arguments.
3566///
3567/// __builtin_astype( value, dst type )
3568///
3569ExprResult Sema::ActOnAsTypeExpr(Expr *expr, ParsedType destty,
3570 SourceLocation BuiltinLoc,
3571 SourceLocation RParenLoc) {
3572 ExprValueKind VK = VK_RValue;
3573 ExprObjectKind OK = OK_Ordinary;
3574 QualType DstTy = GetTypeFromParser(destty);
3575 QualType SrcTy = expr->getType();
3576 if (Context.getTypeSize(DstTy) != Context.getTypeSize(SrcTy))
3577 return ExprError(Diag(BuiltinLoc,
3578 diag::err_invalid_astype_of_different_size)
Peter Collingbourneaf9cddf2011-06-08 15:15:17 +00003579 << DstTy
3580 << SrcTy
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003581 << expr->getSourceRange());
Richard Trieu67e29332011-08-02 04:35:43 +00003582 return Owned(new (Context) AsTypeExpr(expr, DstTy, VK, OK, BuiltinLoc,
3583 RParenLoc));
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003584}
3585
John McCall3b4294e2009-12-16 12:17:52 +00003586/// BuildResolvedCallExpr - Build a call to a resolved expression,
3587/// i.e. an expression not of \p OverloadTy. The expression should
John McCallaa81e162009-12-01 22:10:20 +00003588/// unary-convert to an expression of function-pointer or
3589/// block-pointer type.
3590///
3591/// \param NDecl the declaration being called, if available
John McCall60d7b3a2010-08-24 06:29:42 +00003592ExprResult
John McCallaa81e162009-12-01 22:10:20 +00003593Sema::BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl,
3594 SourceLocation LParenLoc,
3595 Expr **Args, unsigned NumArgs,
Peter Collingbournee08ce652011-02-09 21:07:24 +00003596 SourceLocation RParenLoc,
3597 Expr *Config) {
John McCallaa81e162009-12-01 22:10:20 +00003598 FunctionDecl *FDecl = dyn_cast_or_null<FunctionDecl>(NDecl);
3599
Chris Lattner04421082008-04-08 04:40:51 +00003600 // Promote the function operand.
John Wiegley429bb272011-04-08 18:41:53 +00003601 ExprResult Result = UsualUnaryConversions(Fn);
3602 if (Result.isInvalid())
3603 return ExprError();
3604 Fn = Result.take();
Chris Lattner04421082008-04-08 04:40:51 +00003605
Chris Lattner925e60d2007-12-28 05:29:59 +00003606 // Make the call expr early, before semantic checks. This guarantees cleanup
3607 // of arguments and function on error.
Peter Collingbournee08ce652011-02-09 21:07:24 +00003608 CallExpr *TheCall;
3609 if (Config) {
3610 TheCall = new (Context) CUDAKernelCallExpr(Context, Fn,
3611 cast<CallExpr>(Config),
3612 Args, NumArgs,
3613 Context.BoolTy,
3614 VK_RValue,
3615 RParenLoc);
3616 } else {
3617 TheCall = new (Context) CallExpr(Context, Fn,
3618 Args, NumArgs,
3619 Context.BoolTy,
3620 VK_RValue,
3621 RParenLoc);
3622 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00003623
John McCall8e10f3b2011-02-26 05:39:39 +00003624 unsigned BuiltinID = (FDecl ? FDecl->getBuiltinID() : 0);
3625
3626 // Bail out early if calling a builtin with custom typechecking.
3627 if (BuiltinID && Context.BuiltinInfo.hasCustomTypechecking(BuiltinID))
3628 return CheckBuiltinFunctionCall(BuiltinID, TheCall);
3629
John McCall1de4d4e2011-04-07 08:22:57 +00003630 retry:
Steve Naroffdd972f22008-09-05 22:11:13 +00003631 const FunctionType *FuncT;
John McCall8e10f3b2011-02-26 05:39:39 +00003632 if (const PointerType *PT = Fn->getType()->getAs<PointerType>()) {
Steve Naroffdd972f22008-09-05 22:11:13 +00003633 // C99 6.5.2.2p1 - "The expression that denotes the called function shall
3634 // have type pointer to function".
John McCall183700f2009-09-21 23:43:11 +00003635 FuncT = PT->getPointeeType()->getAs<FunctionType>();
John McCall8e10f3b2011-02-26 05:39:39 +00003636 if (FuncT == 0)
3637 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
3638 << Fn->getType() << Fn->getSourceRange());
3639 } else if (const BlockPointerType *BPT =
3640 Fn->getType()->getAs<BlockPointerType>()) {
3641 FuncT = BPT->getPointeeType()->castAs<FunctionType>();
3642 } else {
John McCall1de4d4e2011-04-07 08:22:57 +00003643 // Handle calls to expressions of unknown-any type.
3644 if (Fn->getType() == Context.UnknownAnyTy) {
John McCall755d8492011-04-12 00:42:48 +00003645 ExprResult rewrite = rebuildUnknownAnyFunction(*this, Fn);
John McCall1de4d4e2011-04-07 08:22:57 +00003646 if (rewrite.isInvalid()) return ExprError();
3647 Fn = rewrite.take();
John McCalla5fc4722011-04-09 22:50:59 +00003648 TheCall->setCallee(Fn);
John McCall1de4d4e2011-04-07 08:22:57 +00003649 goto retry;
3650 }
3651
Sebastian Redl0eb23302009-01-19 00:08:26 +00003652 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
3653 << Fn->getType() << Fn->getSourceRange());
John McCall8e10f3b2011-02-26 05:39:39 +00003654 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00003655
Peter Collingbourne0423fc62011-02-23 01:53:29 +00003656 if (getLangOptions().CUDA) {
3657 if (Config) {
3658 // CUDA: Kernel calls must be to global functions
3659 if (FDecl && !FDecl->hasAttr<CUDAGlobalAttr>())
3660 return ExprError(Diag(LParenLoc,diag::err_kern_call_not_global_function)
3661 << FDecl->getName() << Fn->getSourceRange());
3662
3663 // CUDA: Kernel function must have 'void' return type
3664 if (!FuncT->getResultType()->isVoidType())
3665 return ExprError(Diag(LParenLoc, diag::err_kern_type_not_void_return)
3666 << Fn->getType() << Fn->getSourceRange());
3667 }
3668 }
3669
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00003670 // Check for a valid return type
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003671 if (CheckCallReturnType(FuncT->getResultType(),
John McCall9ae2f072010-08-23 23:25:46 +00003672 Fn->getSourceRange().getBegin(), TheCall,
Anders Carlsson8c8d9192009-10-09 23:51:55 +00003673 FDecl))
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00003674 return ExprError();
3675
Chris Lattner925e60d2007-12-28 05:29:59 +00003676 // We know the result type of the call, set it.
Douglas Gregor5291c3c2010-07-13 08:18:22 +00003677 TheCall->setType(FuncT->getCallResultType(Context));
John McCallf89e55a2010-11-18 06:31:45 +00003678 TheCall->setValueKind(Expr::getValueKindForType(FuncT->getResultType()));
Sebastian Redl0eb23302009-01-19 00:08:26 +00003679
Douglas Gregor72564e72009-02-26 23:50:07 +00003680 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) {
John McCall9ae2f072010-08-23 23:25:46 +00003681 if (ConvertArgumentsForCall(TheCall, Fn, FDecl, Proto, Args, NumArgs,
Douglas Gregor88a35142008-12-22 05:46:06 +00003682 RParenLoc))
Sebastian Redl0eb23302009-01-19 00:08:26 +00003683 return ExprError();
Chris Lattner925e60d2007-12-28 05:29:59 +00003684 } else {
Douglas Gregor72564e72009-02-26 23:50:07 +00003685 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!");
Sebastian Redl0eb23302009-01-19 00:08:26 +00003686
Douglas Gregor74734d52009-04-02 15:37:10 +00003687 if (FDecl) {
3688 // Check if we have too few/too many template arguments, based
3689 // on our knowledge of the function definition.
3690 const FunctionDecl *Def = 0;
Argyrios Kyrtzidis06a54a32010-07-07 11:31:19 +00003691 if (FDecl->hasBody(Def) && NumArgs != Def->param_size()) {
Douglas Gregor46542412010-10-25 20:39:23 +00003692 const FunctionProtoType *Proto
3693 = Def->getType()->getAs<FunctionProtoType>();
3694 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size()))
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00003695 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments)
3696 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange();
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00003697 }
Douglas Gregor46542412010-10-25 20:39:23 +00003698
3699 // If the function we're calling isn't a function prototype, but we have
3700 // a function prototype from a prior declaratiom, use that prototype.
3701 if (!FDecl->hasPrototype())
3702 Proto = FDecl->getType()->getAs<FunctionProtoType>();
Douglas Gregor74734d52009-04-02 15:37:10 +00003703 }
3704
Steve Naroffb291ab62007-08-28 23:30:39 +00003705 // Promote the arguments (C99 6.5.2.2p6).
Chris Lattner925e60d2007-12-28 05:29:59 +00003706 for (unsigned i = 0; i != NumArgs; i++) {
3707 Expr *Arg = Args[i];
Douglas Gregor46542412010-10-25 20:39:23 +00003708
3709 if (Proto && i < Proto->getNumArgs()) {
Douglas Gregor46542412010-10-25 20:39:23 +00003710 InitializedEntity Entity
3711 = InitializedEntity::InitializeParameter(Context,
John McCallf85e1932011-06-15 23:02:42 +00003712 Proto->getArgType(i),
3713 Proto->isArgConsumed(i));
Douglas Gregor46542412010-10-25 20:39:23 +00003714 ExprResult ArgE = PerformCopyInitialization(Entity,
3715 SourceLocation(),
3716 Owned(Arg));
3717 if (ArgE.isInvalid())
3718 return true;
3719
3720 Arg = ArgE.takeAs<Expr>();
3721
3722 } else {
John Wiegley429bb272011-04-08 18:41:53 +00003723 ExprResult ArgE = DefaultArgumentPromotion(Arg);
3724
3725 if (ArgE.isInvalid())
3726 return true;
3727
3728 Arg = ArgE.takeAs<Expr>();
Douglas Gregor46542412010-10-25 20:39:23 +00003729 }
3730
Douglas Gregor0700bbf2010-10-26 05:45:40 +00003731 if (RequireCompleteType(Arg->getSourceRange().getBegin(),
3732 Arg->getType(),
3733 PDiag(diag::err_call_incomplete_argument)
3734 << Arg->getSourceRange()))
3735 return ExprError();
3736
Chris Lattner925e60d2007-12-28 05:29:59 +00003737 TheCall->setArg(i, Arg);
Steve Naroffb291ab62007-08-28 23:30:39 +00003738 }
Reid Spencer5f016e22007-07-11 17:01:13 +00003739 }
Chris Lattner925e60d2007-12-28 05:29:59 +00003740
Douglas Gregor88a35142008-12-22 05:46:06 +00003741 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl))
3742 if (!Method->isStatic())
Sebastian Redl0eb23302009-01-19 00:08:26 +00003743 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object)
3744 << Fn->getSourceRange());
Douglas Gregor88a35142008-12-22 05:46:06 +00003745
Fariborz Jahaniandaf04152009-05-15 20:33:25 +00003746 // Check for sentinels
3747 if (NDecl)
3748 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs);
Mike Stump1eb44332009-09-09 15:08:12 +00003749
Chris Lattner59907c42007-08-10 20:18:51 +00003750 // Do special checking on direct calls to functions.
Anders Carlssond406bf02009-08-16 01:56:34 +00003751 if (FDecl) {
John McCall9ae2f072010-08-23 23:25:46 +00003752 if (CheckFunctionCall(FDecl, TheCall))
Anders Carlssond406bf02009-08-16 01:56:34 +00003753 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00003754
John McCall8e10f3b2011-02-26 05:39:39 +00003755 if (BuiltinID)
Fariborz Jahanian67aba812010-11-30 17:35:24 +00003756 return CheckBuiltinFunctionCall(BuiltinID, TheCall);
Anders Carlssond406bf02009-08-16 01:56:34 +00003757 } else if (NDecl) {
John McCall9ae2f072010-08-23 23:25:46 +00003758 if (CheckBlockCall(NDecl, TheCall))
Anders Carlssond406bf02009-08-16 01:56:34 +00003759 return ExprError();
3760 }
Chris Lattner59907c42007-08-10 20:18:51 +00003761
John McCall9ae2f072010-08-23 23:25:46 +00003762 return MaybeBindToTemporary(TheCall);
Reid Spencer5f016e22007-07-11 17:01:13 +00003763}
3764
John McCall60d7b3a2010-08-24 06:29:42 +00003765ExprResult
John McCallb3d87482010-08-24 05:47:05 +00003766Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, ParsedType Ty,
John McCall9ae2f072010-08-23 23:25:46 +00003767 SourceLocation RParenLoc, Expr *InitExpr) {
Steve Narofff69936d2007-09-16 03:34:24 +00003768 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type");
Steve Naroffaff1edd2007-07-19 21:32:11 +00003769 // FIXME: put back this assert when initializers are worked out.
Steve Narofff69936d2007-09-16 03:34:24 +00003770 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression");
John McCall42f56b52010-01-18 19:35:47 +00003771
3772 TypeSourceInfo *TInfo;
3773 QualType literalType = GetTypeFromParser(Ty, &TInfo);
3774 if (!TInfo)
3775 TInfo = Context.getTrivialTypeSourceInfo(literalType);
3776
John McCall9ae2f072010-08-23 23:25:46 +00003777 return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, InitExpr);
John McCall42f56b52010-01-18 19:35:47 +00003778}
3779
John McCall60d7b3a2010-08-24 06:29:42 +00003780ExprResult
John McCall42f56b52010-01-18 19:35:47 +00003781Sema::BuildCompoundLiteralExpr(SourceLocation LParenLoc, TypeSourceInfo *TInfo,
John McCall9ae2f072010-08-23 23:25:46 +00003782 SourceLocation RParenLoc, Expr *literalExpr) {
John McCall42f56b52010-01-18 19:35:47 +00003783 QualType literalType = TInfo->getType();
Anders Carlssond35c8322007-12-05 07:24:19 +00003784
Eli Friedman6223c222008-05-20 05:22:08 +00003785 if (literalType->isArrayType()) {
Argyrios Kyrtzidise6fe9a22010-11-08 19:14:19 +00003786 if (RequireCompleteType(LParenLoc, Context.getBaseElementType(literalType),
3787 PDiag(diag::err_illegal_decl_array_incomplete_type)
3788 << SourceRange(LParenLoc,
3789 literalExpr->getSourceRange().getEnd())))
3790 return ExprError();
Chris Lattnerc63a1f22008-08-04 07:31:14 +00003791 if (literalType->isVariableArrayType())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00003792 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init)
3793 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()));
Douglas Gregor690dc7f2009-05-21 23:48:18 +00003794 } else if (!literalType->isDependentType() &&
3795 RequireCompleteType(LParenLoc, literalType,
Anders Carlssonb7906612009-08-26 23:45:07 +00003796 PDiag(diag::err_typecheck_decl_incomplete_type)
Mike Stump1eb44332009-09-09 15:08:12 +00003797 << SourceRange(LParenLoc,
Anders Carlssonb7906612009-08-26 23:45:07 +00003798 literalExpr->getSourceRange().getEnd())))
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00003799 return ExprError();
Eli Friedman6223c222008-05-20 05:22:08 +00003800
Douglas Gregor99a2e602009-12-16 01:38:02 +00003801 InitializedEntity Entity
Douglas Gregord6542d82009-12-22 15:35:07 +00003802 = InitializedEntity::InitializeTemporary(literalType);
Douglas Gregor99a2e602009-12-16 01:38:02 +00003803 InitializationKind Kind
John McCallf85e1932011-06-15 23:02:42 +00003804 = InitializationKind::CreateCStyleCast(LParenLoc,
3805 SourceRange(LParenLoc, RParenLoc));
Eli Friedman08544622009-12-22 02:35:53 +00003806 InitializationSequence InitSeq(*this, Entity, Kind, &literalExpr, 1);
John McCall60d7b3a2010-08-24 06:29:42 +00003807 ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
John McCallca0408f2010-08-23 06:44:23 +00003808 MultiExprArg(*this, &literalExpr, 1),
Eli Friedman08544622009-12-22 02:35:53 +00003809 &literalType);
3810 if (Result.isInvalid())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00003811 return ExprError();
John McCall9ae2f072010-08-23 23:25:46 +00003812 literalExpr = Result.get();
Steve Naroffe9b12192008-01-14 18:19:28 +00003813
Chris Lattner371f2582008-12-04 23:50:19 +00003814 bool isFileScope = getCurFunctionOrMethodDecl() == 0;
Steve Naroffe9b12192008-01-14 18:19:28 +00003815 if (isFileScope) { // 6.5.2.5p3
Steve Naroffd0091aa2008-01-10 22:15:12 +00003816 if (CheckForConstantInitializer(literalExpr, literalType))
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00003817 return ExprError();
Steve Naroffd0091aa2008-01-10 22:15:12 +00003818 }
Eli Friedman08544622009-12-22 02:35:53 +00003819
John McCallf89e55a2010-11-18 06:31:45 +00003820 // In C, compound literals are l-values for some reason.
3821 ExprValueKind VK = getLangOptions().CPlusPlus ? VK_RValue : VK_LValue;
3822
Douglas Gregor751ec9b2011-06-17 04:59:12 +00003823 return MaybeBindToTemporary(
3824 new (Context) CompoundLiteralExpr(LParenLoc, TInfo, literalType,
3825 VK, literalExpr, isFileScope));
Steve Naroff4aa88f82007-07-19 01:06:55 +00003826}
3827
John McCall60d7b3a2010-08-24 06:29:42 +00003828ExprResult
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00003829Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist,
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00003830 SourceLocation RBraceLoc) {
3831 unsigned NumInit = initlist.size();
John McCall9ae2f072010-08-23 23:25:46 +00003832 Expr **InitList = initlist.release();
Anders Carlsson66b5a8a2007-08-31 04:56:16 +00003833
Steve Naroff08d92e42007-09-15 18:49:24 +00003834 // Semantic analysis for initializers is done by ActOnDeclarator() and
Mike Stumpeed9cac2009-02-19 03:04:26 +00003835 // CheckInitializer() - it requires knowledge of the object being intialized.
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00003836
Ted Kremenek709210f2010-04-13 23:39:13 +00003837 InitListExpr *E = new (Context) InitListExpr(Context, LBraceLoc, InitList,
3838 NumInit, RBraceLoc);
Chris Lattnerf0467b32008-04-02 04:24:33 +00003839 E->setType(Context.VoidTy); // FIXME: just a place holder for now.
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00003840 return Owned(E);
Steve Naroff4aa88f82007-07-19 01:06:55 +00003841}
3842
John McCallf3ea8cf2010-11-14 08:17:51 +00003843/// Prepares for a scalar cast, performing all the necessary stages
3844/// except the final cast and returning the kind required.
John Wiegley429bb272011-04-08 18:41:53 +00003845static CastKind PrepareScalarCast(Sema &S, ExprResult &Src, QualType DestTy) {
John McCallf3ea8cf2010-11-14 08:17:51 +00003846 // Both Src and Dest are scalar types, i.e. arithmetic or pointer.
3847 // Also, callers should have filtered out the invalid cases with
3848 // pointers. Everything else should be possible.
3849
John Wiegley429bb272011-04-08 18:41:53 +00003850 QualType SrcTy = Src.get()->getType();
John McCallf3ea8cf2010-11-14 08:17:51 +00003851 if (S.Context.hasSameUnqualifiedType(SrcTy, DestTy))
John McCall2de56d12010-08-25 11:45:40 +00003852 return CK_NoOp;
Anders Carlsson82debc72009-10-18 18:12:03 +00003853
John McCalldaa8e4e2010-11-15 09:13:47 +00003854 switch (SrcTy->getScalarTypeKind()) {
3855 case Type::STK_MemberPointer:
3856 llvm_unreachable("member pointer type in C");
Abramo Bagnarabb03f5d2011-01-04 09:50:03 +00003857
John McCalldaa8e4e2010-11-15 09:13:47 +00003858 case Type::STK_Pointer:
3859 switch (DestTy->getScalarTypeKind()) {
3860 case Type::STK_Pointer:
3861 return DestTy->isObjCObjectPointerType() ?
John McCallf3ea8cf2010-11-14 08:17:51 +00003862 CK_AnyPointerToObjCPointerCast :
3863 CK_BitCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00003864 case Type::STK_Bool:
3865 return CK_PointerToBoolean;
3866 case Type::STK_Integral:
3867 return CK_PointerToIntegral;
3868 case Type::STK_Floating:
3869 case Type::STK_FloatingComplex:
3870 case Type::STK_IntegralComplex:
3871 case Type::STK_MemberPointer:
3872 llvm_unreachable("illegal cast from pointer");
3873 }
3874 break;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003875
John McCalldaa8e4e2010-11-15 09:13:47 +00003876 case Type::STK_Bool: // casting from bool is like casting from an integer
3877 case Type::STK_Integral:
3878 switch (DestTy->getScalarTypeKind()) {
3879 case Type::STK_Pointer:
Richard Trieu67e29332011-08-02 04:35:43 +00003880 if (Src.get()->isNullPointerConstant(S.Context,
3881 Expr::NPC_ValueDependentIsNull))
John McCall404cd162010-11-13 01:35:44 +00003882 return CK_NullToPointer;
John McCall2de56d12010-08-25 11:45:40 +00003883 return CK_IntegralToPointer;
John McCalldaa8e4e2010-11-15 09:13:47 +00003884 case Type::STK_Bool:
3885 return CK_IntegralToBoolean;
3886 case Type::STK_Integral:
John McCallf3ea8cf2010-11-14 08:17:51 +00003887 return CK_IntegralCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00003888 case Type::STK_Floating:
John McCall2de56d12010-08-25 11:45:40 +00003889 return CK_IntegralToFloating;
John McCalldaa8e4e2010-11-15 09:13:47 +00003890 case Type::STK_IntegralComplex:
Richard Trieu67e29332011-08-02 04:35:43 +00003891 Src = S.ImpCastExprToType(Src.take(),
3892 DestTy->getAs<ComplexType>()->getElementType(),
John Wiegley429bb272011-04-08 18:41:53 +00003893 CK_IntegralCast);
John McCallf3ea8cf2010-11-14 08:17:51 +00003894 return CK_IntegralRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00003895 case Type::STK_FloatingComplex:
Richard Trieu67e29332011-08-02 04:35:43 +00003896 Src = S.ImpCastExprToType(Src.take(),
3897 DestTy->getAs<ComplexType>()->getElementType(),
John Wiegley429bb272011-04-08 18:41:53 +00003898 CK_IntegralToFloating);
John McCallf3ea8cf2010-11-14 08:17:51 +00003899 return CK_FloatingRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00003900 case Type::STK_MemberPointer:
3901 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00003902 }
3903 break;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003904
John McCalldaa8e4e2010-11-15 09:13:47 +00003905 case Type::STK_Floating:
3906 switch (DestTy->getScalarTypeKind()) {
3907 case Type::STK_Floating:
John McCall2de56d12010-08-25 11:45:40 +00003908 return CK_FloatingCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00003909 case Type::STK_Bool:
3910 return CK_FloatingToBoolean;
3911 case Type::STK_Integral:
John McCall2de56d12010-08-25 11:45:40 +00003912 return CK_FloatingToIntegral;
John McCalldaa8e4e2010-11-15 09:13:47 +00003913 case Type::STK_FloatingComplex:
Richard Trieu67e29332011-08-02 04:35:43 +00003914 Src = S.ImpCastExprToType(Src.take(),
3915 DestTy->getAs<ComplexType>()->getElementType(),
John Wiegley429bb272011-04-08 18:41:53 +00003916 CK_FloatingCast);
John McCallf3ea8cf2010-11-14 08:17:51 +00003917 return CK_FloatingRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00003918 case Type::STK_IntegralComplex:
Richard Trieu67e29332011-08-02 04:35:43 +00003919 Src = S.ImpCastExprToType(Src.take(),
3920 DestTy->getAs<ComplexType>()->getElementType(),
John Wiegley429bb272011-04-08 18:41:53 +00003921 CK_FloatingToIntegral);
John McCallf3ea8cf2010-11-14 08:17:51 +00003922 return CK_IntegralRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00003923 case Type::STK_Pointer:
3924 llvm_unreachable("valid float->pointer cast?");
3925 case Type::STK_MemberPointer:
3926 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00003927 }
3928 break;
3929
John McCalldaa8e4e2010-11-15 09:13:47 +00003930 case Type::STK_FloatingComplex:
3931 switch (DestTy->getScalarTypeKind()) {
3932 case Type::STK_FloatingComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00003933 return CK_FloatingComplexCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00003934 case Type::STK_IntegralComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00003935 return CK_FloatingComplexToIntegralComplex;
John McCall8786da72010-12-14 17:51:41 +00003936 case Type::STK_Floating: {
Abramo Bagnarabb03f5d2011-01-04 09:50:03 +00003937 QualType ET = SrcTy->getAs<ComplexType>()->getElementType();
John McCall8786da72010-12-14 17:51:41 +00003938 if (S.Context.hasSameType(ET, DestTy))
3939 return CK_FloatingComplexToReal;
John Wiegley429bb272011-04-08 18:41:53 +00003940 Src = S.ImpCastExprToType(Src.take(), ET, CK_FloatingComplexToReal);
John McCall8786da72010-12-14 17:51:41 +00003941 return CK_FloatingCast;
3942 }
John McCalldaa8e4e2010-11-15 09:13:47 +00003943 case Type::STK_Bool:
John McCallf3ea8cf2010-11-14 08:17:51 +00003944 return CK_FloatingComplexToBoolean;
John McCalldaa8e4e2010-11-15 09:13:47 +00003945 case Type::STK_Integral:
Richard Trieu67e29332011-08-02 04:35:43 +00003946 Src = S.ImpCastExprToType(Src.take(),
3947 SrcTy->getAs<ComplexType>()->getElementType(),
John Wiegley429bb272011-04-08 18:41:53 +00003948 CK_FloatingComplexToReal);
John McCallf3ea8cf2010-11-14 08:17:51 +00003949 return CK_FloatingToIntegral;
John McCalldaa8e4e2010-11-15 09:13:47 +00003950 case Type::STK_Pointer:
3951 llvm_unreachable("valid complex float->pointer cast?");
3952 case Type::STK_MemberPointer:
3953 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00003954 }
3955 break;
3956
John McCalldaa8e4e2010-11-15 09:13:47 +00003957 case Type::STK_IntegralComplex:
3958 switch (DestTy->getScalarTypeKind()) {
3959 case Type::STK_FloatingComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00003960 return CK_IntegralComplexToFloatingComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00003961 case Type::STK_IntegralComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00003962 return CK_IntegralComplexCast;
John McCall8786da72010-12-14 17:51:41 +00003963 case Type::STK_Integral: {
Abramo Bagnarabb03f5d2011-01-04 09:50:03 +00003964 QualType ET = SrcTy->getAs<ComplexType>()->getElementType();
John McCall8786da72010-12-14 17:51:41 +00003965 if (S.Context.hasSameType(ET, DestTy))
3966 return CK_IntegralComplexToReal;
John Wiegley429bb272011-04-08 18:41:53 +00003967 Src = S.ImpCastExprToType(Src.take(), ET, CK_IntegralComplexToReal);
John McCall8786da72010-12-14 17:51:41 +00003968 return CK_IntegralCast;
3969 }
John McCalldaa8e4e2010-11-15 09:13:47 +00003970 case Type::STK_Bool:
John McCallf3ea8cf2010-11-14 08:17:51 +00003971 return CK_IntegralComplexToBoolean;
John McCalldaa8e4e2010-11-15 09:13:47 +00003972 case Type::STK_Floating:
Richard Trieu67e29332011-08-02 04:35:43 +00003973 Src = S.ImpCastExprToType(Src.take(),
3974 SrcTy->getAs<ComplexType>()->getElementType(),
John Wiegley429bb272011-04-08 18:41:53 +00003975 CK_IntegralComplexToReal);
John McCallf3ea8cf2010-11-14 08:17:51 +00003976 return CK_IntegralToFloating;
John McCalldaa8e4e2010-11-15 09:13:47 +00003977 case Type::STK_Pointer:
3978 llvm_unreachable("valid complex int->pointer cast?");
3979 case Type::STK_MemberPointer:
3980 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00003981 }
3982 break;
Anders Carlsson82debc72009-10-18 18:12:03 +00003983 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003984
John McCallf3ea8cf2010-11-14 08:17:51 +00003985 llvm_unreachable("Unhandled scalar cast");
3986 return CK_BitCast;
Anders Carlsson82debc72009-10-18 18:12:03 +00003987}
3988
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00003989/// CheckCastTypes - Check type constraints for casting between types.
John McCallf85e1932011-06-15 23:02:42 +00003990ExprResult Sema::CheckCastTypes(SourceLocation CastStartLoc, SourceRange TyR,
3991 QualType castType, Expr *castExpr,
3992 CastKind& Kind, ExprValueKind &VK,
John Wiegley429bb272011-04-08 18:41:53 +00003993 CXXCastPath &BasePath, bool FunctionalStyle) {
John McCall1de4d4e2011-04-07 08:22:57 +00003994 if (castExpr->getType() == Context.UnknownAnyTy)
3995 return checkUnknownAnyCast(TyR, castType, castExpr, Kind, VK, BasePath);
3996
Sebastian Redl9cc11e72009-07-25 15:41:38 +00003997 if (getLangOptions().CPlusPlus)
John McCallf85e1932011-06-15 23:02:42 +00003998 return CXXCheckCStyleCast(SourceRange(CastStartLoc,
Douglas Gregor40749ee2010-11-03 00:35:38 +00003999 castExpr->getLocEnd()),
John McCallf89e55a2010-11-18 06:31:45 +00004000 castType, VK, castExpr, Kind, BasePath,
Anders Carlsson5cf86ba2010-04-24 19:06:50 +00004001 FunctionalStyle);
Sebastian Redl9cc11e72009-07-25 15:41:38 +00004002
John McCallfb8721c2011-04-10 19:13:55 +00004003 assert(!castExpr->getType()->isPlaceholderType());
4004
John McCallf89e55a2010-11-18 06:31:45 +00004005 // We only support r-value casts in C.
4006 VK = VK_RValue;
4007
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00004008 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression
4009 // type needs to be scalar.
4010 if (castType->isVoidType()) {
John McCallf6a16482010-12-04 03:47:34 +00004011 // We don't necessarily do lvalue-to-rvalue conversions on this.
John Wiegley429bb272011-04-08 18:41:53 +00004012 ExprResult castExprRes = IgnoredValueConversions(castExpr);
4013 if (castExprRes.isInvalid())
4014 return ExprError();
4015 castExpr = castExprRes.take();
John McCallf6a16482010-12-04 03:47:34 +00004016
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00004017 // Cast to void allows any expr type.
John McCall2de56d12010-08-25 11:45:40 +00004018 Kind = CK_ToVoid;
John Wiegley429bb272011-04-08 18:41:53 +00004019 return Owned(castExpr);
Anders Carlssonebeaf202009-10-16 02:35:04 +00004020 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004021
John Wiegley429bb272011-04-08 18:41:53 +00004022 ExprResult castExprRes = DefaultFunctionArrayLvalueConversion(castExpr);
4023 if (castExprRes.isInvalid())
4024 return ExprError();
4025 castExpr = castExprRes.take();
John McCallf6a16482010-12-04 03:47:34 +00004026
Eli Friedman8d438082010-07-17 20:43:49 +00004027 if (RequireCompleteType(TyR.getBegin(), castType,
4028 diag::err_typecheck_cast_to_incomplete))
John Wiegley429bb272011-04-08 18:41:53 +00004029 return ExprError();
Eli Friedman8d438082010-07-17 20:43:49 +00004030
Anders Carlssonebeaf202009-10-16 02:35:04 +00004031 if (!castType->isScalarType() && !castType->isVectorType()) {
Douglas Gregora4923eb2009-11-16 21:35:15 +00004032 if (Context.hasSameUnqualifiedType(castType, castExpr->getType()) &&
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00004033 (castType->isStructureType() || castType->isUnionType())) {
4034 // GCC struct/union extension: allow cast to self.
Eli Friedmanb1d796d2009-03-23 00:24:07 +00004035 // FIXME: Check that the cast destination type is complete.
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00004036 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar)
4037 << castType << castExpr->getSourceRange();
John McCall2de56d12010-08-25 11:45:40 +00004038 Kind = CK_NoOp;
John Wiegley429bb272011-04-08 18:41:53 +00004039 return Owned(castExpr);
Anders Carlssonc3516322009-10-16 02:48:28 +00004040 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004041
Anders Carlssonc3516322009-10-16 02:48:28 +00004042 if (castType->isUnionType()) {
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00004043 // GCC cast to union extension
Ted Kremenek6217b802009-07-29 21:53:49 +00004044 RecordDecl *RD = castType->getAs<RecordType>()->getDecl();
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00004045 RecordDecl::field_iterator Field, FieldEnd;
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00004046 for (Field = RD->field_begin(), FieldEnd = RD->field_end();
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00004047 Field != FieldEnd; ++Field) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004048 if (Context.hasSameUnqualifiedType(Field->getType(),
Abramo Bagnara8c4bfe52010-10-07 21:20:44 +00004049 castExpr->getType()) &&
4050 !Field->isUnnamedBitfield()) {
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00004051 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union)
4052 << castExpr->getSourceRange();
4053 break;
4054 }
4055 }
John Wiegley429bb272011-04-08 18:41:53 +00004056 if (Field == FieldEnd) {
4057 Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type)
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00004058 << castExpr->getType() << castExpr->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00004059 return ExprError();
4060 }
John McCall2de56d12010-08-25 11:45:40 +00004061 Kind = CK_ToUnion;
John Wiegley429bb272011-04-08 18:41:53 +00004062 return Owned(castExpr);
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00004063 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004064
Anders Carlssonc3516322009-10-16 02:48:28 +00004065 // Reject any other conversions to non-scalar types.
John Wiegley429bb272011-04-08 18:41:53 +00004066 Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar)
Anders Carlssonc3516322009-10-16 02:48:28 +00004067 << castType << castExpr->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00004068 return ExprError();
Anders Carlssonc3516322009-10-16 02:48:28 +00004069 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004070
John McCallf3ea8cf2010-11-14 08:17:51 +00004071 // The type we're casting to is known to be a scalar or vector.
4072
4073 // Require the operand to be a scalar or vector.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004074 if (!castExpr->getType()->isScalarType() &&
Anders Carlssonc3516322009-10-16 02:48:28 +00004075 !castExpr->getType()->isVectorType()) {
John Wiegley429bb272011-04-08 18:41:53 +00004076 Diag(castExpr->getLocStart(),
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00004077 diag::err_typecheck_expect_scalar_operand)
Chris Lattnerd1625842008-11-24 06:25:27 +00004078 << castExpr->getType() << castExpr->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00004079 return ExprError();
Anders Carlssonc3516322009-10-16 02:48:28 +00004080 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004081
4082 if (castType->isExtVectorType())
Anders Carlsson16a89042009-10-16 05:23:41 +00004083 return CheckExtVectorCast(TyR, castType, castExpr, Kind);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004084
Anton Yartsevd06fea82011-03-27 09:32:40 +00004085 if (castType->isVectorType()) {
4086 if (castType->getAs<VectorType>()->getVectorKind() ==
4087 VectorType::AltiVecVector &&
4088 (castExpr->getType()->isIntegerType() ||
4089 castExpr->getType()->isFloatingType())) {
4090 Kind = CK_VectorSplat;
John Wiegley429bb272011-04-08 18:41:53 +00004091 return Owned(castExpr);
4092 } else if (CheckVectorCast(TyR, castType, castExpr->getType(), Kind)) {
4093 return ExprError();
Anton Yartsevd06fea82011-03-27 09:32:40 +00004094 } else
John Wiegley429bb272011-04-08 18:41:53 +00004095 return Owned(castExpr);
Anton Yartsevd06fea82011-03-27 09:32:40 +00004096 }
John Wiegley429bb272011-04-08 18:41:53 +00004097 if (castExpr->getType()->isVectorType()) {
4098 if (CheckVectorCast(TyR, castExpr->getType(), castType, Kind))
4099 return ExprError();
4100 else
4101 return Owned(castExpr);
4102 }
Anders Carlssonc3516322009-10-16 02:48:28 +00004103
John McCallf3ea8cf2010-11-14 08:17:51 +00004104 // The source and target types are both scalars, i.e.
4105 // - arithmetic types (fundamental, enum, and complex)
4106 // - all kinds of pointers
4107 // Note that member pointers were filtered out with C++, above.
4108
John Wiegley429bb272011-04-08 18:41:53 +00004109 if (isa<ObjCSelectorExpr>(castExpr)) {
4110 Diag(castExpr->getLocStart(), diag::err_cast_selector_expr);
4111 return ExprError();
4112 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004113
John McCallf3ea8cf2010-11-14 08:17:51 +00004114 // If either type is a pointer, the other type has to be either an
4115 // integer or a pointer.
John McCallf85e1932011-06-15 23:02:42 +00004116 QualType castExprType = castExpr->getType();
Anders Carlssonc3516322009-10-16 02:48:28 +00004117 if (!castType->isArithmeticType()) {
Douglas Gregor9d3347a2010-06-16 00:35:25 +00004118 if (!castExprType->isIntegralType(Context) &&
John Wiegley429bb272011-04-08 18:41:53 +00004119 castExprType->isArithmeticType()) {
4120 Diag(castExpr->getLocStart(),
4121 diag::err_cast_pointer_from_non_pointer_int)
Eli Friedman41826bb2009-05-01 02:23:58 +00004122 << castExprType << castExpr->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00004123 return ExprError();
4124 }
Eli Friedman41826bb2009-05-01 02:23:58 +00004125 } else if (!castExpr->getType()->isArithmeticType()) {
John Wiegley429bb272011-04-08 18:41:53 +00004126 if (!castType->isIntegralType(Context) && castType->isArithmeticType()) {
4127 Diag(castExpr->getLocStart(), diag::err_cast_pointer_to_non_pointer_int)
Eli Friedman41826bb2009-05-01 02:23:58 +00004128 << castType << castExpr->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00004129 return ExprError();
4130 }
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00004131 }
Anders Carlsson82debc72009-10-18 18:12:03 +00004132
John McCallf85e1932011-06-15 23:02:42 +00004133 if (getLangOptions().ObjCAutoRefCount) {
4134 // Diagnose problems with Objective-C casts involving lifetime qualifiers.
4135 CheckObjCARCConversion(SourceRange(CastStartLoc, castExpr->getLocEnd()),
4136 castType, castExpr, CCK_CStyleCast);
4137
4138 if (const PointerType *CastPtr = castType->getAs<PointerType>()) {
4139 if (const PointerType *ExprPtr = castExprType->getAs<PointerType>()) {
4140 Qualifiers CastQuals = CastPtr->getPointeeType().getQualifiers();
4141 Qualifiers ExprQuals = ExprPtr->getPointeeType().getQualifiers();
4142 if (CastPtr->getPointeeType()->isObjCLifetimeType() &&
4143 ExprPtr->getPointeeType()->isObjCLifetimeType() &&
4144 !CastQuals.compatiblyIncludesObjCLifetime(ExprQuals)) {
4145 Diag(castExpr->getLocStart(),
Argyrios Kyrtzidisb8b03132011-06-24 00:08:59 +00004146 diag::err_typecheck_incompatible_ownership)
John McCallf85e1932011-06-15 23:02:42 +00004147 << castExprType << castType << AA_Casting
4148 << castExpr->getSourceRange();
4149
4150 return ExprError();
4151 }
4152 }
Fariborz Jahanian04e5a252011-07-07 18:55:47 +00004153 }
Fariborz Jahanian7a084ec2011-07-07 23:04:17 +00004154 else if (!CheckObjCARCUnavailableWeakConversion(castType, castExprType)) {
4155 Diag(castExpr->getLocStart(),
Fariborz Jahanian82007c32011-07-08 17:41:42 +00004156 diag::err_arc_convesion_of_weak_unavailable) << 1
Fariborz Jahanian04e5a252011-07-07 18:55:47 +00004157 << castExprType << castType
4158 << castExpr->getSourceRange();
Fariborz Jahanian7a084ec2011-07-07 23:04:17 +00004159 return ExprError();
John McCallf85e1932011-06-15 23:02:42 +00004160 }
4161 }
4162
John Wiegley429bb272011-04-08 18:41:53 +00004163 castExprRes = Owned(castExpr);
4164 Kind = PrepareScalarCast(*this, castExprRes, castType);
4165 if (castExprRes.isInvalid())
4166 return ExprError();
4167 castExpr = castExprRes.take();
John McCallb7f4ffe2010-08-12 21:44:57 +00004168
John McCallf3ea8cf2010-11-14 08:17:51 +00004169 if (Kind == CK_BitCast)
John McCallb7f4ffe2010-08-12 21:44:57 +00004170 CheckCastAlign(castExpr, castType, TyR);
4171
John Wiegley429bb272011-04-08 18:41:53 +00004172 return Owned(castExpr);
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00004173}
4174
Anders Carlssonc3516322009-10-16 02:48:28 +00004175bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty,
John McCall2de56d12010-08-25 11:45:40 +00004176 CastKind &Kind) {
Anders Carlssona64db8f2007-11-27 05:51:55 +00004177 assert(VectorTy->isVectorType() && "Not a vector type!");
Mike Stumpeed9cac2009-02-19 03:04:26 +00004178
Anders Carlssona64db8f2007-11-27 05:51:55 +00004179 if (Ty->isVectorType() || Ty->isIntegerType()) {
Chris Lattner98be4942008-03-05 18:54:05 +00004180 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty))
Anders Carlssona64db8f2007-11-27 05:51:55 +00004181 return Diag(R.getBegin(),
Mike Stumpeed9cac2009-02-19 03:04:26 +00004182 Ty->isVectorType() ?
Anders Carlssona64db8f2007-11-27 05:51:55 +00004183 diag::err_invalid_conversion_between_vectors :
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00004184 diag::err_invalid_conversion_between_vector_and_integer)
Chris Lattnerd1625842008-11-24 06:25:27 +00004185 << VectorTy << Ty << R;
Anders Carlssona64db8f2007-11-27 05:51:55 +00004186 } else
4187 return Diag(R.getBegin(),
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00004188 diag::err_invalid_conversion_between_vector_and_scalar)
Chris Lattnerd1625842008-11-24 06:25:27 +00004189 << VectorTy << Ty << R;
Mike Stumpeed9cac2009-02-19 03:04:26 +00004190
John McCall2de56d12010-08-25 11:45:40 +00004191 Kind = CK_BitCast;
Anders Carlssona64db8f2007-11-27 05:51:55 +00004192 return false;
4193}
4194
John Wiegley429bb272011-04-08 18:41:53 +00004195ExprResult Sema::CheckExtVectorCast(SourceRange R, QualType DestTy,
4196 Expr *CastExpr, CastKind &Kind) {
Nate Begeman58d29a42009-06-26 00:50:28 +00004197 assert(DestTy->isExtVectorType() && "Not an extended vector type!");
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004198
Anders Carlsson16a89042009-10-16 05:23:41 +00004199 QualType SrcTy = CastExpr->getType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004200
Nate Begeman9b10da62009-06-27 22:05:55 +00004201 // If SrcTy is a VectorType, the total size must match to explicitly cast to
4202 // an ExtVectorType.
Nate Begeman58d29a42009-06-26 00:50:28 +00004203 if (SrcTy->isVectorType()) {
John Wiegley429bb272011-04-08 18:41:53 +00004204 if (Context.getTypeSize(DestTy) != Context.getTypeSize(SrcTy)) {
4205 Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors)
Nate Begeman58d29a42009-06-26 00:50:28 +00004206 << DestTy << SrcTy << R;
John Wiegley429bb272011-04-08 18:41:53 +00004207 return ExprError();
4208 }
John McCall2de56d12010-08-25 11:45:40 +00004209 Kind = CK_BitCast;
John Wiegley429bb272011-04-08 18:41:53 +00004210 return Owned(CastExpr);
Nate Begeman58d29a42009-06-26 00:50:28 +00004211 }
4212
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00004213 // All non-pointer scalars can be cast to ExtVector type. The appropriate
Nate Begeman58d29a42009-06-26 00:50:28 +00004214 // conversion will take place first from scalar to elt type, and then
4215 // splat from elt type to vector.
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00004216 if (SrcTy->isPointerType())
4217 return Diag(R.getBegin(),
4218 diag::err_invalid_conversion_between_vector_and_scalar)
4219 << DestTy << SrcTy << R;
Eli Friedman73c39ab2009-10-20 08:27:19 +00004220
4221 QualType DestElemTy = DestTy->getAs<ExtVectorType>()->getElementType();
John Wiegley429bb272011-04-08 18:41:53 +00004222 ExprResult CastExprRes = Owned(CastExpr);
4223 CastKind CK = PrepareScalarCast(*this, CastExprRes, DestElemTy);
4224 if (CastExprRes.isInvalid())
4225 return ExprError();
4226 CastExpr = ImpCastExprToType(CastExprRes.take(), DestElemTy, CK).take();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004227
John McCall2de56d12010-08-25 11:45:40 +00004228 Kind = CK_VectorSplat;
John Wiegley429bb272011-04-08 18:41:53 +00004229 return Owned(CastExpr);
Nate Begeman58d29a42009-06-26 00:50:28 +00004230}
4231
John McCall60d7b3a2010-08-24 06:29:42 +00004232ExprResult
Argyrios Kyrtzidis0a851832011-07-01 22:22:59 +00004233Sema::ActOnCastExpr(Scope *S, SourceLocation LParenLoc,
4234 Declarator &D, ParsedType &Ty,
John McCall9ae2f072010-08-23 23:25:46 +00004235 SourceLocation RParenLoc, Expr *castExpr) {
Argyrios Kyrtzidis0a851832011-07-01 22:22:59 +00004236 assert(!D.isInvalidType() && (castExpr != 0) &&
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00004237 "ActOnCastExpr(): missing type or expr");
Steve Naroff16beff82007-07-16 23:25:18 +00004238
Argyrios Kyrtzidis0a851832011-07-01 22:22:59 +00004239 TypeSourceInfo *castTInfo = GetTypeForDeclaratorCast(D, castExpr->getType());
4240 if (D.isInvalidType())
4241 return ExprError();
4242
4243 if (getLangOptions().CPlusPlus) {
4244 // Check that there are no default arguments (C++ only).
4245 CheckExtraCXXDefaultArguments(D);
4246 }
4247
4248 QualType castType = castTInfo->getType();
4249 Ty = CreateParsedType(castType, castTInfo);
Mike Stump1eb44332009-09-09 15:08:12 +00004250
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004251 bool isVectorLiteral = false;
4252
4253 // Check for an altivec or OpenCL literal,
4254 // i.e. all the elements are integer constants.
4255 ParenExpr *PE = dyn_cast<ParenExpr>(castExpr);
4256 ParenListExpr *PLE = dyn_cast<ParenListExpr>(castExpr);
4257 if (getLangOptions().AltiVec && castType->isVectorType() && (PE || PLE)) {
4258 if (PLE && PLE->getNumExprs() == 0) {
4259 Diag(PLE->getExprLoc(), diag::err_altivec_empty_initializer);
4260 return ExprError();
4261 }
4262 if (PE || PLE->getNumExprs() == 1) {
4263 Expr *E = (PE ? PE->getSubExpr() : PLE->getExpr(0));
4264 if (!E->getType()->isVectorType())
4265 isVectorLiteral = true;
4266 }
4267 else
4268 isVectorLiteral = true;
4269 }
4270
4271 // If this is a vector initializer, '(' type ')' '(' init, ..., init ')'
4272 // then handle it as such.
4273 if (isVectorLiteral)
4274 return BuildVectorLiteral(LParenLoc, RParenLoc, castExpr, castTInfo);
4275
Nate Begeman2ef13e52009-08-10 23:49:36 +00004276 // If the Expr being casted is a ParenListExpr, handle it specially.
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004277 // This is not an AltiVec-style cast, so turn the ParenListExpr into a
4278 // sequence of BinOp comma operators.
4279 if (isa<ParenListExpr>(castExpr)) {
4280 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, castExpr);
4281 if (Result.isInvalid()) return ExprError();
4282 castExpr = Result.take();
4283 }
John McCallb042fdf2010-01-15 18:56:44 +00004284
John McCall9ae2f072010-08-23 23:25:46 +00004285 return BuildCStyleCastExpr(LParenLoc, castTInfo, RParenLoc, castExpr);
John McCallb042fdf2010-01-15 18:56:44 +00004286}
4287
John McCall60d7b3a2010-08-24 06:29:42 +00004288ExprResult
John McCallb042fdf2010-01-15 18:56:44 +00004289Sema::BuildCStyleCastExpr(SourceLocation LParenLoc, TypeSourceInfo *Ty,
John McCall9ae2f072010-08-23 23:25:46 +00004290 SourceLocation RParenLoc, Expr *castExpr) {
John McCalldaa8e4e2010-11-15 09:13:47 +00004291 CastKind Kind = CK_Invalid;
John McCallf89e55a2010-11-18 06:31:45 +00004292 ExprValueKind VK = VK_RValue;
John McCallf871d0c2010-08-07 06:22:56 +00004293 CXXCastPath BasePath;
John Wiegley429bb272011-04-08 18:41:53 +00004294 ExprResult CastResult =
John McCallf85e1932011-06-15 23:02:42 +00004295 CheckCastTypes(LParenLoc, SourceRange(LParenLoc, RParenLoc), Ty->getType(),
4296 castExpr, Kind, VK, BasePath);
John Wiegley429bb272011-04-08 18:41:53 +00004297 if (CastResult.isInvalid())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00004298 return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00004299 castExpr = CastResult.take();
Anders Carlsson0aebc812009-09-09 21:33:21 +00004300
Richard Trieu67e29332011-08-02 04:35:43 +00004301 return Owned(CStyleCastExpr::Create(
4302 Context, Ty->getType().getNonLValueExprType(Context), VK, Kind, castExpr,
4303 &BasePath, Ty, LParenLoc, RParenLoc));
Reid Spencer5f016e22007-07-11 17:01:13 +00004304}
4305
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004306ExprResult Sema::BuildVectorLiteral(SourceLocation LParenLoc,
4307 SourceLocation RParenLoc, Expr *E,
4308 TypeSourceInfo *TInfo) {
4309 assert((isa<ParenListExpr>(E) || isa<ParenExpr>(E)) &&
4310 "Expected paren or paren list expression");
4311
4312 Expr **exprs;
4313 unsigned numExprs;
4314 Expr *subExpr;
4315 if (ParenListExpr *PE = dyn_cast<ParenListExpr>(E)) {
4316 exprs = PE->getExprs();
4317 numExprs = PE->getNumExprs();
4318 } else {
4319 subExpr = cast<ParenExpr>(E)->getSubExpr();
4320 exprs = &subExpr;
4321 numExprs = 1;
4322 }
4323
4324 QualType Ty = TInfo->getType();
4325 assert(Ty->isVectorType() && "Expected vector type");
4326
Chris Lattner5f9e2722011-07-23 10:55:15 +00004327 SmallVector<Expr *, 8> initExprs;
Tanya Lattner61b4bc82011-07-15 23:07:01 +00004328 const VectorType *VTy = Ty->getAs<VectorType>();
4329 unsigned numElems = Ty->getAs<VectorType>()->getNumElements();
4330
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004331 // '(...)' form of vector initialization in AltiVec: the number of
4332 // initializers must be one or must match the size of the vector.
4333 // If a single value is specified in the initializer then it will be
4334 // replicated to all the components of the vector
Tanya Lattner61b4bc82011-07-15 23:07:01 +00004335 if (VTy->getVectorKind() == VectorType::AltiVecVector) {
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004336 // The number of initializers must be one or must match the size of the
4337 // vector. If a single value is specified in the initializer then it will
4338 // be replicated to all the components of the vector
4339 if (numExprs == 1) {
4340 QualType ElemTy = Ty->getAs<VectorType>()->getElementType();
4341 ExprResult Literal = Owned(exprs[0]);
4342 Literal = ImpCastExprToType(Literal.take(), ElemTy,
4343 PrepareScalarCast(*this, Literal, ElemTy));
4344 return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Literal.take());
4345 }
4346 else if (numExprs < numElems) {
4347 Diag(E->getExprLoc(),
4348 diag::err_incorrect_number_of_vector_initializers);
4349 return ExprError();
4350 }
4351 else
4352 for (unsigned i = 0, e = numExprs; i != e; ++i)
4353 initExprs.push_back(exprs[i]);
4354 }
Tanya Lattner61b4bc82011-07-15 23:07:01 +00004355 else {
4356 // For OpenCL, when the number of initializers is a single value,
4357 // it will be replicated to all components of the vector.
4358 if (getLangOptions().OpenCL &&
4359 VTy->getVectorKind() == VectorType::GenericVector &&
4360 numExprs == 1) {
4361 QualType ElemTy = Ty->getAs<VectorType>()->getElementType();
4362 ExprResult Literal = Owned(exprs[0]);
4363 Literal = ImpCastExprToType(Literal.take(), ElemTy,
4364 PrepareScalarCast(*this, Literal, ElemTy));
4365 return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Literal.take());
4366 }
4367
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004368 for (unsigned i = 0, e = numExprs; i != e; ++i)
4369 initExprs.push_back(exprs[i]);
Tanya Lattner61b4bc82011-07-15 23:07:01 +00004370 }
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004371 // FIXME: This means that pretty-printing the final AST will produce curly
4372 // braces instead of the original commas.
4373 InitListExpr *initE = new (Context) InitListExpr(Context, LParenLoc,
4374 &initExprs[0],
4375 initExprs.size(), RParenLoc);
4376 initE->setType(Ty);
4377 return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, initE);
4378}
4379
Nate Begeman2ef13e52009-08-10 23:49:36 +00004380/// This is not an AltiVec-style cast, so turn the ParenListExpr into a sequence
4381/// of comma binary operators.
John McCall60d7b3a2010-08-24 06:29:42 +00004382ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00004383Sema::MaybeConvertParenListExprToParenExpr(Scope *S, Expr *expr) {
Nate Begeman2ef13e52009-08-10 23:49:36 +00004384 ParenListExpr *E = dyn_cast<ParenListExpr>(expr);
4385 if (!E)
4386 return Owned(expr);
Mike Stump1eb44332009-09-09 15:08:12 +00004387
John McCall60d7b3a2010-08-24 06:29:42 +00004388 ExprResult Result(E->getExpr(0));
Mike Stump1eb44332009-09-09 15:08:12 +00004389
Nate Begeman2ef13e52009-08-10 23:49:36 +00004390 for (unsigned i = 1, e = E->getNumExprs(); i != e && !Result.isInvalid(); ++i)
John McCall9ae2f072010-08-23 23:25:46 +00004391 Result = ActOnBinOp(S, E->getExprLoc(), tok::comma, Result.get(),
4392 E->getExpr(i));
Mike Stump1eb44332009-09-09 15:08:12 +00004393
John McCall9ae2f072010-08-23 23:25:46 +00004394 if (Result.isInvalid()) return ExprError();
4395
4396 return ActOnParenExpr(E->getLParenLoc(), E->getRParenLoc(), Result.get());
Nate Begeman2ef13e52009-08-10 23:49:36 +00004397}
4398
John McCall60d7b3a2010-08-24 06:29:42 +00004399ExprResult Sema::ActOnParenOrParenListExpr(SourceLocation L,
Nate Begeman2ef13e52009-08-10 23:49:36 +00004400 SourceLocation R,
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004401 MultiExprArg Val) {
Nate Begeman2ef13e52009-08-10 23:49:36 +00004402 unsigned nexprs = Val.size();
4403 Expr **exprs = reinterpret_cast<Expr**>(Val.release());
Fariborz Jahanianf88f7ab2009-11-25 01:26:41 +00004404 assert((exprs != 0) && "ActOnParenOrParenListExpr() missing expr list");
4405 Expr *expr;
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004406 if (nexprs == 1)
Fariborz Jahanianf88f7ab2009-11-25 01:26:41 +00004407 expr = new (Context) ParenExpr(L, R, exprs[0]);
4408 else
Manuel Klimek0d9106f2011-06-22 20:02:16 +00004409 expr = new (Context) ParenListExpr(Context, L, exprs, nexprs, R,
4410 exprs[nexprs-1]->getType());
Nate Begeman2ef13e52009-08-10 23:49:36 +00004411 return Owned(expr);
4412}
4413
Chandler Carruth82214a82011-02-18 23:54:50 +00004414/// \brief Emit a specialized diagnostic when one expression is a null pointer
4415/// constant and the other is not a pointer.
4416bool Sema::DiagnoseConditionalForNull(Expr *LHS, Expr *RHS,
4417 SourceLocation QuestionLoc) {
4418 Expr *NullExpr = LHS;
4419 Expr *NonPointerExpr = RHS;
4420 Expr::NullPointerConstantKind NullKind =
4421 NullExpr->isNullPointerConstant(Context,
4422 Expr::NPC_ValueDependentIsNotNull);
4423
4424 if (NullKind == Expr::NPCK_NotNull) {
4425 NullExpr = RHS;
4426 NonPointerExpr = LHS;
4427 NullKind =
4428 NullExpr->isNullPointerConstant(Context,
4429 Expr::NPC_ValueDependentIsNotNull);
4430 }
4431
4432 if (NullKind == Expr::NPCK_NotNull)
4433 return false;
4434
4435 if (NullKind == Expr::NPCK_ZeroInteger) {
4436 // In this case, check to make sure that we got here from a "NULL"
4437 // string in the source code.
4438 NullExpr = NullExpr->IgnoreParenImpCasts();
John McCall834e3f62011-03-08 07:59:04 +00004439 SourceLocation loc = NullExpr->getExprLoc();
4440 if (!findMacroSpelling(loc, "NULL"))
Chandler Carruth82214a82011-02-18 23:54:50 +00004441 return false;
4442 }
4443
4444 int DiagType = (NullKind == Expr::NPCK_CXX0X_nullptr);
4445 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands_null)
4446 << NonPointerExpr->getType() << DiagType
4447 << NonPointerExpr->getSourceRange();
4448 return true;
4449}
4450
Sebastian Redl28507842009-02-26 14:39:58 +00004451/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension.
4452/// In that case, lhs = cond.
Chris Lattnera119a3b2009-02-18 04:38:20 +00004453/// C99 6.5.15
Richard Trieu67e29332011-08-02 04:35:43 +00004454QualType Sema::CheckConditionalOperands(ExprResult &Cond, ExprResult &LHS,
4455 ExprResult &RHS, ExprValueKind &VK,
4456 ExprObjectKind &OK,
Chris Lattnera119a3b2009-02-18 04:38:20 +00004457 SourceLocation QuestionLoc) {
Douglas Gregorfadb53b2011-03-12 01:48:56 +00004458
John McCallfb8721c2011-04-10 19:13:55 +00004459 ExprResult lhsResult = CheckPlaceholderExpr(LHS.get());
John McCall1de4d4e2011-04-07 08:22:57 +00004460 if (!lhsResult.isUsable()) return QualType();
John Wiegley429bb272011-04-08 18:41:53 +00004461 LHS = move(lhsResult);
Douglas Gregor7ad5d422010-11-09 21:07:58 +00004462
John McCallfb8721c2011-04-10 19:13:55 +00004463 ExprResult rhsResult = CheckPlaceholderExpr(RHS.get());
John McCall1de4d4e2011-04-07 08:22:57 +00004464 if (!rhsResult.isUsable()) return QualType();
John Wiegley429bb272011-04-08 18:41:53 +00004465 RHS = move(rhsResult);
Douglas Gregor7ad5d422010-11-09 21:07:58 +00004466
Sebastian Redl3201f6b2009-04-16 17:51:27 +00004467 // C++ is sufficiently different to merit its own checker.
4468 if (getLangOptions().CPlusPlus)
John McCall56ca35d2011-02-17 10:25:35 +00004469 return CXXCheckConditionalOperands(Cond, LHS, RHS, VK, OK, QuestionLoc);
John McCallf89e55a2010-11-18 06:31:45 +00004470
4471 VK = VK_RValue;
John McCall09431682010-11-18 19:01:18 +00004472 OK = OK_Ordinary;
Sebastian Redl3201f6b2009-04-16 17:51:27 +00004473
John Wiegley429bb272011-04-08 18:41:53 +00004474 Cond = UsualUnaryConversions(Cond.take());
4475 if (Cond.isInvalid())
4476 return QualType();
4477 LHS = UsualUnaryConversions(LHS.take());
4478 if (LHS.isInvalid())
4479 return QualType();
4480 RHS = UsualUnaryConversions(RHS.take());
4481 if (RHS.isInvalid())
4482 return QualType();
4483
4484 QualType CondTy = Cond.get()->getType();
4485 QualType LHSTy = LHS.get()->getType();
4486 QualType RHSTy = RHS.get()->getType();
Steve Naroffc80b4ee2007-07-16 21:54:35 +00004487
Reid Spencer5f016e22007-07-11 17:01:13 +00004488 // first, check the condition.
Sebastian Redl3201f6b2009-04-16 17:51:27 +00004489 if (!CondTy->isScalarType()) { // C99 6.5.15p2
Nate Begeman6155d732010-09-20 22:41:17 +00004490 // OpenCL: Sec 6.3.i says the condition is allowed to be a vector or scalar.
4491 // Throw an error if its not either.
4492 if (getLangOptions().OpenCL) {
4493 if (!CondTy->isVectorType()) {
John Wiegley429bb272011-04-08 18:41:53 +00004494 Diag(Cond.get()->getLocStart(),
Nate Begeman6155d732010-09-20 22:41:17 +00004495 diag::err_typecheck_cond_expect_scalar_or_vector)
4496 << CondTy;
4497 return QualType();
4498 }
4499 }
4500 else {
John Wiegley429bb272011-04-08 18:41:53 +00004501 Diag(Cond.get()->getLocStart(), diag::err_typecheck_cond_expect_scalar)
Nate Begeman6155d732010-09-20 22:41:17 +00004502 << CondTy;
4503 return QualType();
4504 }
Reid Spencer5f016e22007-07-11 17:01:13 +00004505 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00004506
Chris Lattner70d67a92008-01-06 22:42:25 +00004507 // Now check the two expressions.
Nate Begeman2ef13e52009-08-10 23:49:36 +00004508 if (LHSTy->isVectorType() || RHSTy->isVectorType())
Eli Friedmanb9b4b782011-06-23 18:10:35 +00004509 return CheckVectorOperands(LHS, RHS, QuestionLoc, /*isCompAssign*/false);
Douglas Gregor898574e2008-12-05 23:32:09 +00004510
Nate Begeman6155d732010-09-20 22:41:17 +00004511 // OpenCL: If the condition is a vector, and both operands are scalar,
4512 // attempt to implicity convert them to the vector type to act like the
4513 // built in select.
4514 if (getLangOptions().OpenCL && CondTy->isVectorType()) {
4515 // Both operands should be of scalar type.
4516 if (!LHSTy->isScalarType()) {
John Wiegley429bb272011-04-08 18:41:53 +00004517 Diag(LHS.get()->getLocStart(), diag::err_typecheck_cond_expect_scalar)
Nate Begeman6155d732010-09-20 22:41:17 +00004518 << CondTy;
4519 return QualType();
4520 }
4521 if (!RHSTy->isScalarType()) {
John Wiegley429bb272011-04-08 18:41:53 +00004522 Diag(RHS.get()->getLocStart(), diag::err_typecheck_cond_expect_scalar)
Nate Begeman6155d732010-09-20 22:41:17 +00004523 << CondTy;
4524 return QualType();
4525 }
4526 // Implicity convert these scalars to the type of the condition.
John Wiegley429bb272011-04-08 18:41:53 +00004527 LHS = ImpCastExprToType(LHS.take(), CondTy, CK_IntegralCast);
4528 RHS = ImpCastExprToType(RHS.take(), CondTy, CK_IntegralCast);
Nate Begeman6155d732010-09-20 22:41:17 +00004529 }
4530
Chris Lattner70d67a92008-01-06 22:42:25 +00004531 // If both operands have arithmetic type, do the usual arithmetic conversions
4532 // to find a common type: C99 6.5.15p3,5.
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004533 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) {
4534 UsualArithmeticConversions(LHS, RHS);
John Wiegley429bb272011-04-08 18:41:53 +00004535 if (LHS.isInvalid() || RHS.isInvalid())
4536 return QualType();
4537 return LHS.get()->getType();
Steve Naroffa4332e22007-07-17 00:58:39 +00004538 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00004539
Chris Lattner70d67a92008-01-06 22:42:25 +00004540 // If both operands are the same structure or union type, the result is that
4541 // type.
Ted Kremenek6217b802009-07-29 21:53:49 +00004542 if (const RecordType *LHSRT = LHSTy->getAs<RecordType>()) { // C99 6.5.15p3
4543 if (const RecordType *RHSRT = RHSTy->getAs<RecordType>())
Chris Lattnera21ddb32007-11-26 01:40:58 +00004544 if (LHSRT->getDecl() == RHSRT->getDecl())
Mike Stumpeed9cac2009-02-19 03:04:26 +00004545 // "If both the operands have structure or union type, the result has
Chris Lattner70d67a92008-01-06 22:42:25 +00004546 // that type." This implies that CV qualifiers are dropped.
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004547 return LHSTy.getUnqualifiedType();
Eli Friedmanb1d796d2009-03-23 00:24:07 +00004548 // FIXME: Type of conditional expression must be complete in C mode.
Reid Spencer5f016e22007-07-11 17:01:13 +00004549 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00004550
Chris Lattner70d67a92008-01-06 22:42:25 +00004551 // C99 6.5.15p5: "If both operands have void type, the result has void type."
Steve Naroffe701c0a2008-05-12 21:44:38 +00004552 // The following || allows only one side to be void (a GCC-ism).
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004553 if (LHSTy->isVoidType() || RHSTy->isVoidType()) {
4554 if (!LHSTy->isVoidType())
John Wiegley429bb272011-04-08 18:41:53 +00004555 Diag(RHS.get()->getLocStart(), diag::ext_typecheck_cond_one_void)
4556 << RHS.get()->getSourceRange();
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004557 if (!RHSTy->isVoidType())
John Wiegley429bb272011-04-08 18:41:53 +00004558 Diag(LHS.get()->getLocStart(), diag::ext_typecheck_cond_one_void)
4559 << LHS.get()->getSourceRange();
4560 LHS = ImpCastExprToType(LHS.take(), Context.VoidTy, CK_ToVoid);
4561 RHS = ImpCastExprToType(RHS.take(), Context.VoidTy, CK_ToVoid);
Eli Friedman0e724012008-06-04 19:47:51 +00004562 return Context.VoidTy;
Steve Naroffe701c0a2008-05-12 21:44:38 +00004563 }
Steve Naroffb6d54e52008-01-08 01:11:38 +00004564 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has
4565 // the type of the other operand."
Steve Naroff58f9f2c2009-07-14 18:25:06 +00004566 if ((LHSTy->isAnyPointerType() || LHSTy->isBlockPointerType()) &&
Richard Trieu67e29332011-08-02 04:35:43 +00004567 RHS.get()->isNullPointerConstant(Context,
4568 Expr::NPC_ValueDependentIsNull)) {
Eli Friedman73c39ab2009-10-20 08:27:19 +00004569 // promote the null to a pointer.
John Wiegley429bb272011-04-08 18:41:53 +00004570 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_NullToPointer);
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004571 return LHSTy;
Steve Naroffb6d54e52008-01-08 01:11:38 +00004572 }
Steve Naroff58f9f2c2009-07-14 18:25:06 +00004573 if ((RHSTy->isAnyPointerType() || RHSTy->isBlockPointerType()) &&
Richard Trieu67e29332011-08-02 04:35:43 +00004574 LHS.get()->isNullPointerConstant(Context,
4575 Expr::NPC_ValueDependentIsNull)) {
John Wiegley429bb272011-04-08 18:41:53 +00004576 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_NullToPointer);
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004577 return RHSTy;
Steve Naroffb6d54e52008-01-08 01:11:38 +00004578 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004579
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004580 // All objective-c pointer type analysis is done here.
4581 QualType compositeType = FindCompositeObjCPointerType(LHS, RHS,
4582 QuestionLoc);
John Wiegley429bb272011-04-08 18:41:53 +00004583 if (LHS.isInvalid() || RHS.isInvalid())
4584 return QualType();
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004585 if (!compositeType.isNull())
4586 return compositeType;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004587
4588
Steve Naroff7154a772009-07-01 14:36:47 +00004589 // Handle block pointer types.
4590 if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType()) {
4591 if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) {
4592 if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) {
4593 QualType destType = Context.getPointerType(Context.VoidTy);
John Wiegley429bb272011-04-08 18:41:53 +00004594 LHS = ImpCastExprToType(LHS.take(), destType, CK_BitCast);
4595 RHS = ImpCastExprToType(RHS.take(), destType, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00004596 return destType;
4597 }
4598 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
Richard Trieu67e29332011-08-02 04:35:43 +00004599 << LHSTy << RHSTy << LHS.get()->getSourceRange()
4600 << RHS.get()->getSourceRange();
Steve Naroff7154a772009-07-01 14:36:47 +00004601 return QualType();
Mike Stumpdd3e1662009-05-07 03:14:14 +00004602 }
Steve Naroff7154a772009-07-01 14:36:47 +00004603 // We have 2 block pointer types.
4604 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
4605 // Two identical block pointer types are always compatible.
Mike Stumpdd3e1662009-05-07 03:14:14 +00004606 return LHSTy;
4607 }
Steve Naroff7154a772009-07-01 14:36:47 +00004608 // The block pointer types aren't identical, continue checking.
Ted Kremenek6217b802009-07-29 21:53:49 +00004609 QualType lhptee = LHSTy->getAs<BlockPointerType>()->getPointeeType();
4610 QualType rhptee = RHSTy->getAs<BlockPointerType>()->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004611
Steve Naroff7154a772009-07-01 14:36:47 +00004612 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(),
4613 rhptee.getUnqualifiedType())) {
Mike Stumpdd3e1662009-05-07 03:14:14 +00004614 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers)
Richard Trieu67e29332011-08-02 04:35:43 +00004615 << LHSTy << RHSTy << LHS.get()->getSourceRange()
4616 << RHS.get()->getSourceRange();
Mike Stumpdd3e1662009-05-07 03:14:14 +00004617 // In this situation, we assume void* type. No especially good
4618 // reason, but this is what gcc does, and we do have to pick
4619 // to get a consistent AST.
4620 QualType incompatTy = Context.getPointerType(Context.VoidTy);
John Wiegley429bb272011-04-08 18:41:53 +00004621 LHS = ImpCastExprToType(LHS.take(), incompatTy, CK_BitCast);
4622 RHS = ImpCastExprToType(RHS.take(), incompatTy, CK_BitCast);
Mike Stumpdd3e1662009-05-07 03:14:14 +00004623 return incompatTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00004624 }
Steve Naroff7154a772009-07-01 14:36:47 +00004625 // The block pointer types are compatible.
John Wiegley429bb272011-04-08 18:41:53 +00004626 LHS = ImpCastExprToType(LHS.take(), LHSTy, CK_BitCast);
4627 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
Steve Naroff91588042009-04-08 17:05:15 +00004628 return LHSTy;
4629 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004630
Steve Naroff7154a772009-07-01 14:36:47 +00004631 // Check constraints for C object pointers types (C99 6.5.15p3,6).
4632 if (LHSTy->isPointerType() && RHSTy->isPointerType()) {
4633 // get the "pointed to" types
Ted Kremenek6217b802009-07-29 21:53:49 +00004634 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
4635 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
Steve Naroff7154a772009-07-01 14:36:47 +00004636
4637 // ignore qualifiers on void (C99 6.5.15p3, clause 6)
4638 if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) {
4639 // Figure out necessary qualifiers (C99 6.5.15p6)
John McCall0953e762009-09-24 19:53:00 +00004640 QualType destPointee
4641 = Context.getQualifiedType(lhptee, rhptee.getQualifiers());
Steve Naroff7154a772009-07-01 14:36:47 +00004642 QualType destType = Context.getPointerType(destPointee);
Eli Friedman73c39ab2009-10-20 08:27:19 +00004643 // Add qualifiers if necessary.
John Wiegley429bb272011-04-08 18:41:53 +00004644 LHS = ImpCastExprToType(LHS.take(), destType, CK_NoOp);
Eli Friedman73c39ab2009-10-20 08:27:19 +00004645 // Promote to void*.
John Wiegley429bb272011-04-08 18:41:53 +00004646 RHS = ImpCastExprToType(RHS.take(), destType, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00004647 return destType;
4648 }
4649 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) {
John McCall0953e762009-09-24 19:53:00 +00004650 QualType destPointee
4651 = Context.getQualifiedType(rhptee, lhptee.getQualifiers());
Steve Naroff7154a772009-07-01 14:36:47 +00004652 QualType destType = Context.getPointerType(destPointee);
Eli Friedman73c39ab2009-10-20 08:27:19 +00004653 // Add qualifiers if necessary.
John Wiegley429bb272011-04-08 18:41:53 +00004654 RHS = ImpCastExprToType(RHS.take(), destType, CK_NoOp);
Eli Friedman73c39ab2009-10-20 08:27:19 +00004655 // Promote to void*.
John Wiegley429bb272011-04-08 18:41:53 +00004656 LHS = ImpCastExprToType(LHS.take(), destType, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00004657 return destType;
4658 }
4659
4660 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
4661 // Two identical pointer types are always compatible.
4662 return LHSTy;
4663 }
4664 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(),
4665 rhptee.getUnqualifiedType())) {
4666 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers)
Richard Trieu67e29332011-08-02 04:35:43 +00004667 << LHSTy << RHSTy << LHS.get()->getSourceRange()
4668 << RHS.get()->getSourceRange();
Steve Naroff7154a772009-07-01 14:36:47 +00004669 // In this situation, we assume void* type. No especially good
4670 // reason, but this is what gcc does, and we do have to pick
4671 // to get a consistent AST.
4672 QualType incompatTy = Context.getPointerType(Context.VoidTy);
John Wiegley429bb272011-04-08 18:41:53 +00004673 LHS = ImpCastExprToType(LHS.take(), incompatTy, CK_BitCast);
4674 RHS = ImpCastExprToType(RHS.take(), incompatTy, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00004675 return incompatTy;
4676 }
4677 // The pointer types are compatible.
4678 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to
4679 // differently qualified versions of compatible types, the result type is
4680 // a pointer to an appropriately qualified version of the *composite*
4681 // type.
4682 // FIXME: Need to calculate the composite type.
4683 // FIXME: Need to add qualifiers
John Wiegley429bb272011-04-08 18:41:53 +00004684 LHS = ImpCastExprToType(LHS.take(), LHSTy, CK_BitCast);
4685 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00004686 return LHSTy;
4687 }
Mike Stump1eb44332009-09-09 15:08:12 +00004688
John McCall404cd162010-11-13 01:35:44 +00004689 // GCC compatibility: soften pointer/integer mismatch. Note that
4690 // null pointers have been filtered out by this point.
Steve Naroff7154a772009-07-01 14:36:47 +00004691 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) {
4692 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch)
Richard Trieu67e29332011-08-02 04:35:43 +00004693 << LHSTy << RHSTy << LHS.get()->getSourceRange()
4694 << RHS.get()->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00004695 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_IntegralToPointer);
Steve Naroff7154a772009-07-01 14:36:47 +00004696 return RHSTy;
4697 }
4698 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) {
4699 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch)
Richard Trieu67e29332011-08-02 04:35:43 +00004700 << LHSTy << RHSTy << LHS.get()->getSourceRange()
4701 << RHS.get()->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00004702 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_IntegralToPointer);
Steve Naroff7154a772009-07-01 14:36:47 +00004703 return LHSTy;
4704 }
Daniel Dunbar5e155f02008-09-11 23:12:46 +00004705
Chandler Carruth82214a82011-02-18 23:54:50 +00004706 // Emit a better diagnostic if one of the expressions is a null pointer
4707 // constant and the other is not a pointer type. In this case, the user most
4708 // likely forgot to take the address of the other expression.
John Wiegley429bb272011-04-08 18:41:53 +00004709 if (DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
Chandler Carruth82214a82011-02-18 23:54:50 +00004710 return QualType();
4711
Chris Lattner70d67a92008-01-06 22:42:25 +00004712 // Otherwise, the operands are not compatible.
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004713 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
Richard Trieu67e29332011-08-02 04:35:43 +00004714 << LHSTy << RHSTy << LHS.get()->getSourceRange()
4715 << RHS.get()->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00004716 return QualType();
4717}
4718
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004719/// FindCompositeObjCPointerType - Helper method to find composite type of
4720/// two objective-c pointer types of the two input expressions.
John Wiegley429bb272011-04-08 18:41:53 +00004721QualType Sema::FindCompositeObjCPointerType(ExprResult &LHS, ExprResult &RHS,
Richard Trieu67e29332011-08-02 04:35:43 +00004722 SourceLocation QuestionLoc) {
John Wiegley429bb272011-04-08 18:41:53 +00004723 QualType LHSTy = LHS.get()->getType();
4724 QualType RHSTy = RHS.get()->getType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004725
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004726 // Handle things like Class and struct objc_class*. Here we case the result
4727 // to the pseudo-builtin, because that will be implicitly cast back to the
4728 // redefinition type if an attempt is made to access its fields.
4729 if (LHSTy->isObjCClassType() &&
John McCall49f4e1c2010-12-10 11:01:00 +00004730 (Context.hasSameType(RHSTy, Context.ObjCClassRedefinitionType))) {
John Wiegley429bb272011-04-08 18:41:53 +00004731 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004732 return LHSTy;
4733 }
4734 if (RHSTy->isObjCClassType() &&
John McCall49f4e1c2010-12-10 11:01:00 +00004735 (Context.hasSameType(LHSTy, Context.ObjCClassRedefinitionType))) {
John Wiegley429bb272011-04-08 18:41:53 +00004736 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004737 return RHSTy;
4738 }
4739 // And the same for struct objc_object* / id
4740 if (LHSTy->isObjCIdType() &&
John McCall49f4e1c2010-12-10 11:01:00 +00004741 (Context.hasSameType(RHSTy, Context.ObjCIdRedefinitionType))) {
John Wiegley429bb272011-04-08 18:41:53 +00004742 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004743 return LHSTy;
4744 }
4745 if (RHSTy->isObjCIdType() &&
John McCall49f4e1c2010-12-10 11:01:00 +00004746 (Context.hasSameType(LHSTy, Context.ObjCIdRedefinitionType))) {
John Wiegley429bb272011-04-08 18:41:53 +00004747 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004748 return RHSTy;
4749 }
4750 // And the same for struct objc_selector* / SEL
4751 if (Context.isObjCSelType(LHSTy) &&
John McCall49f4e1c2010-12-10 11:01:00 +00004752 (Context.hasSameType(RHSTy, Context.ObjCSelRedefinitionType))) {
John Wiegley429bb272011-04-08 18:41:53 +00004753 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004754 return LHSTy;
4755 }
4756 if (Context.isObjCSelType(RHSTy) &&
John McCall49f4e1c2010-12-10 11:01:00 +00004757 (Context.hasSameType(LHSTy, Context.ObjCSelRedefinitionType))) {
John Wiegley429bb272011-04-08 18:41:53 +00004758 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004759 return RHSTy;
4760 }
4761 // Check constraints for Objective-C object pointers types.
4762 if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004763
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004764 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
4765 // Two identical object pointer types are always compatible.
4766 return LHSTy;
4767 }
4768 const ObjCObjectPointerType *LHSOPT = LHSTy->getAs<ObjCObjectPointerType>();
4769 const ObjCObjectPointerType *RHSOPT = RHSTy->getAs<ObjCObjectPointerType>();
4770 QualType compositeType = LHSTy;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004771
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004772 // If both operands are interfaces and either operand can be
4773 // assigned to the other, use that type as the composite
4774 // type. This allows
4775 // xxx ? (A*) a : (B*) b
4776 // where B is a subclass of A.
4777 //
4778 // Additionally, as for assignment, if either type is 'id'
4779 // allow silent coercion. Finally, if the types are
4780 // incompatible then make sure to use 'id' as the composite
4781 // type so the result is acceptable for sending messages to.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004782
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004783 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'.
4784 // It could return the composite type.
4785 if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) {
4786 compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy;
4787 } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) {
4788 compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy;
4789 } else if ((LHSTy->isObjCQualifiedIdType() ||
4790 RHSTy->isObjCQualifiedIdType()) &&
4791 Context.ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true)) {
4792 // Need to handle "id<xx>" explicitly.
4793 // GCC allows qualified id and any Objective-C type to devolve to
4794 // id. Currently localizing to here until clear this should be
4795 // part of ObjCQualifiedIdTypesAreCompatible.
4796 compositeType = Context.getObjCIdType();
4797 } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) {
4798 compositeType = Context.getObjCIdType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004799 } else if (!(compositeType =
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004800 Context.areCommonBaseCompatible(LHSOPT, RHSOPT)).isNull())
4801 ;
4802 else {
4803 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands)
4804 << LHSTy << RHSTy
John Wiegley429bb272011-04-08 18:41:53 +00004805 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004806 QualType incompatTy = Context.getObjCIdType();
John Wiegley429bb272011-04-08 18:41:53 +00004807 LHS = ImpCastExprToType(LHS.take(), incompatTy, CK_BitCast);
4808 RHS = ImpCastExprToType(RHS.take(), incompatTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004809 return incompatTy;
4810 }
4811 // The object pointer types are compatible.
John Wiegley429bb272011-04-08 18:41:53 +00004812 LHS = ImpCastExprToType(LHS.take(), compositeType, CK_BitCast);
4813 RHS = ImpCastExprToType(RHS.take(), compositeType, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004814 return compositeType;
4815 }
4816 // Check Objective-C object pointer types and 'void *'
4817 if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) {
4818 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
4819 QualType rhptee = RHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
4820 QualType destPointee
4821 = Context.getQualifiedType(lhptee, rhptee.getQualifiers());
4822 QualType destType = Context.getPointerType(destPointee);
4823 // Add qualifiers if necessary.
John Wiegley429bb272011-04-08 18:41:53 +00004824 LHS = ImpCastExprToType(LHS.take(), destType, CK_NoOp);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004825 // Promote to void*.
John Wiegley429bb272011-04-08 18:41:53 +00004826 RHS = ImpCastExprToType(RHS.take(), destType, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004827 return destType;
4828 }
4829 if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) {
4830 QualType lhptee = LHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
4831 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
4832 QualType destPointee
4833 = Context.getQualifiedType(rhptee, lhptee.getQualifiers());
4834 QualType destType = Context.getPointerType(destPointee);
4835 // Add qualifiers if necessary.
John Wiegley429bb272011-04-08 18:41:53 +00004836 RHS = ImpCastExprToType(RHS.take(), destType, CK_NoOp);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004837 // Promote to void*.
John Wiegley429bb272011-04-08 18:41:53 +00004838 LHS = ImpCastExprToType(LHS.take(), destType, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004839 return destType;
4840 }
4841 return QualType();
4842}
4843
Chandler Carruthf0b60d62011-06-16 01:05:14 +00004844/// SuggestParentheses - Emit a note with a fixit hint that wraps
Hans Wennborg9cfdae32011-06-03 18:00:36 +00004845/// ParenRange in parentheses.
4846static void SuggestParentheses(Sema &Self, SourceLocation Loc,
Chandler Carruthf0b60d62011-06-16 01:05:14 +00004847 const PartialDiagnostic &Note,
4848 SourceRange ParenRange) {
4849 SourceLocation EndLoc = Self.PP.getLocForEndOfToken(ParenRange.getEnd());
4850 if (ParenRange.getBegin().isFileID() && ParenRange.getEnd().isFileID() &&
4851 EndLoc.isValid()) {
4852 Self.Diag(Loc, Note)
4853 << FixItHint::CreateInsertion(ParenRange.getBegin(), "(")
4854 << FixItHint::CreateInsertion(EndLoc, ")");
4855 } else {
4856 // We can't display the parentheses, so just show the bare note.
4857 Self.Diag(Loc, Note) << ParenRange;
Hans Wennborg9cfdae32011-06-03 18:00:36 +00004858 }
Hans Wennborg9cfdae32011-06-03 18:00:36 +00004859}
4860
4861static bool IsArithmeticOp(BinaryOperatorKind Opc) {
4862 return Opc >= BO_Mul && Opc <= BO_Shr;
4863}
4864
Hans Wennborg2f072b42011-06-09 17:06:51 +00004865/// IsArithmeticBinaryExpr - Returns true if E is an arithmetic binary
4866/// expression, either using a built-in or overloaded operator,
4867/// and sets *OpCode to the opcode and *RHS to the right-hand side expression.
4868static bool IsArithmeticBinaryExpr(Expr *E, BinaryOperatorKind *Opcode,
4869 Expr **RHS) {
4870 E = E->IgnoreParenImpCasts();
4871 E = E->IgnoreConversionOperator();
4872 E = E->IgnoreParenImpCasts();
4873
4874 // Built-in binary operator.
4875 if (BinaryOperator *OP = dyn_cast<BinaryOperator>(E)) {
4876 if (IsArithmeticOp(OP->getOpcode())) {
4877 *Opcode = OP->getOpcode();
4878 *RHS = OP->getRHS();
4879 return true;
4880 }
4881 }
4882
4883 // Overloaded operator.
4884 if (CXXOperatorCallExpr *Call = dyn_cast<CXXOperatorCallExpr>(E)) {
4885 if (Call->getNumArgs() != 2)
4886 return false;
4887
4888 // Make sure this is really a binary operator that is safe to pass into
4889 // BinaryOperator::getOverloadedOpcode(), e.g. it's not a subscript op.
4890 OverloadedOperatorKind OO = Call->getOperator();
4891 if (OO < OO_Plus || OO > OO_Arrow)
4892 return false;
4893
4894 BinaryOperatorKind OpKind = BinaryOperator::getOverloadedOpcode(OO);
4895 if (IsArithmeticOp(OpKind)) {
4896 *Opcode = OpKind;
4897 *RHS = Call->getArg(1);
4898 return true;
4899 }
4900 }
4901
4902 return false;
4903}
4904
Hans Wennborg9cfdae32011-06-03 18:00:36 +00004905static bool IsLogicOp(BinaryOperatorKind Opc) {
4906 return (Opc >= BO_LT && Opc <= BO_NE) || (Opc >= BO_LAnd && Opc <= BO_LOr);
4907}
4908
Hans Wennborg2f072b42011-06-09 17:06:51 +00004909/// ExprLooksBoolean - Returns true if E looks boolean, i.e. it has boolean type
4910/// or is a logical expression such as (x==y) which has int type, but is
4911/// commonly interpreted as boolean.
4912static bool ExprLooksBoolean(Expr *E) {
4913 E = E->IgnoreParenImpCasts();
4914
4915 if (E->getType()->isBooleanType())
4916 return true;
4917 if (BinaryOperator *OP = dyn_cast<BinaryOperator>(E))
4918 return IsLogicOp(OP->getOpcode());
4919 if (UnaryOperator *OP = dyn_cast<UnaryOperator>(E))
4920 return OP->getOpcode() == UO_LNot;
4921
4922 return false;
4923}
4924
Hans Wennborg9cfdae32011-06-03 18:00:36 +00004925/// DiagnoseConditionalPrecedence - Emit a warning when a conditional operator
4926/// and binary operator are mixed in a way that suggests the programmer assumed
4927/// the conditional operator has higher precedence, for example:
4928/// "int x = a + someBinaryCondition ? 1 : 2".
4929static void DiagnoseConditionalPrecedence(Sema &Self,
4930 SourceLocation OpLoc,
Chandler Carruth43bc78d2011-06-16 01:05:08 +00004931 Expr *Condition,
4932 Expr *LHS,
4933 Expr *RHS) {
Hans Wennborg2f072b42011-06-09 17:06:51 +00004934 BinaryOperatorKind CondOpcode;
4935 Expr *CondRHS;
Hans Wennborg9cfdae32011-06-03 18:00:36 +00004936
Chandler Carruth43bc78d2011-06-16 01:05:08 +00004937 if (!IsArithmeticBinaryExpr(Condition, &CondOpcode, &CondRHS))
Hans Wennborg2f072b42011-06-09 17:06:51 +00004938 return;
4939 if (!ExprLooksBoolean(CondRHS))
4940 return;
Hans Wennborg9cfdae32011-06-03 18:00:36 +00004941
Hans Wennborg2f072b42011-06-09 17:06:51 +00004942 // The condition is an arithmetic binary expression, with a right-
4943 // hand side that looks boolean, so warn.
Hans Wennborg9cfdae32011-06-03 18:00:36 +00004944
Chandler Carruthf0b60d62011-06-16 01:05:14 +00004945 Self.Diag(OpLoc, diag::warn_precedence_conditional)
Chandler Carruth43bc78d2011-06-16 01:05:08 +00004946 << Condition->getSourceRange()
Hans Wennborg2f072b42011-06-09 17:06:51 +00004947 << BinaryOperator::getOpcodeStr(CondOpcode);
Hans Wennborg9cfdae32011-06-03 18:00:36 +00004948
Chandler Carruthf0b60d62011-06-16 01:05:14 +00004949 SuggestParentheses(Self, OpLoc,
4950 Self.PDiag(diag::note_precedence_conditional_silence)
4951 << BinaryOperator::getOpcodeStr(CondOpcode),
4952 SourceRange(Condition->getLocStart(), Condition->getLocEnd()));
Chandler Carruth9d5353c2011-06-21 23:04:18 +00004953
4954 SuggestParentheses(Self, OpLoc,
4955 Self.PDiag(diag::note_precedence_conditional_first),
4956 SourceRange(CondRHS->getLocStart(), RHS->getLocEnd()));
Hans Wennborg9cfdae32011-06-03 18:00:36 +00004957}
4958
Steve Narofff69936d2007-09-16 03:34:24 +00004959/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null
Reid Spencer5f016e22007-07-11 17:01:13 +00004960/// in the case of a the GNU conditional expr extension.
John McCall60d7b3a2010-08-24 06:29:42 +00004961ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc,
John McCall56ca35d2011-02-17 10:25:35 +00004962 SourceLocation ColonLoc,
4963 Expr *CondExpr, Expr *LHSExpr,
4964 Expr *RHSExpr) {
Chris Lattnera21ddb32007-11-26 01:40:58 +00004965 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS
4966 // was the condition.
John McCall56ca35d2011-02-17 10:25:35 +00004967 OpaqueValueExpr *opaqueValue = 0;
4968 Expr *commonExpr = 0;
4969 if (LHSExpr == 0) {
4970 commonExpr = CondExpr;
4971
4972 // We usually want to apply unary conversions *before* saving, except
4973 // in the special case of a C++ l-value conditional.
4974 if (!(getLangOptions().CPlusPlus
4975 && !commonExpr->isTypeDependent()
4976 && commonExpr->getValueKind() == RHSExpr->getValueKind()
4977 && commonExpr->isGLValue()
4978 && commonExpr->isOrdinaryOrBitFieldObject()
4979 && RHSExpr->isOrdinaryOrBitFieldObject()
4980 && Context.hasSameType(commonExpr->getType(), RHSExpr->getType()))) {
John Wiegley429bb272011-04-08 18:41:53 +00004981 ExprResult commonRes = UsualUnaryConversions(commonExpr);
4982 if (commonRes.isInvalid())
4983 return ExprError();
4984 commonExpr = commonRes.take();
John McCall56ca35d2011-02-17 10:25:35 +00004985 }
4986
4987 opaqueValue = new (Context) OpaqueValueExpr(commonExpr->getExprLoc(),
4988 commonExpr->getType(),
4989 commonExpr->getValueKind(),
4990 commonExpr->getObjectKind());
4991 LHSExpr = CondExpr = opaqueValue;
Fariborz Jahanianf9b949f2010-08-31 18:02:20 +00004992 }
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00004993
John McCallf89e55a2010-11-18 06:31:45 +00004994 ExprValueKind VK = VK_RValue;
John McCall09431682010-11-18 19:01:18 +00004995 ExprObjectKind OK = OK_Ordinary;
John Wiegley429bb272011-04-08 18:41:53 +00004996 ExprResult Cond = Owned(CondExpr), LHS = Owned(LHSExpr), RHS = Owned(RHSExpr);
4997 QualType result = CheckConditionalOperands(Cond, LHS, RHS,
John McCall56ca35d2011-02-17 10:25:35 +00004998 VK, OK, QuestionLoc);
John Wiegley429bb272011-04-08 18:41:53 +00004999 if (result.isNull() || Cond.isInvalid() || LHS.isInvalid() ||
5000 RHS.isInvalid())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005001 return ExprError();
5002
Hans Wennborg9cfdae32011-06-03 18:00:36 +00005003 DiagnoseConditionalPrecedence(*this, QuestionLoc, Cond.get(), LHS.get(),
5004 RHS.get());
5005
John McCall56ca35d2011-02-17 10:25:35 +00005006 if (!commonExpr)
John Wiegley429bb272011-04-08 18:41:53 +00005007 return Owned(new (Context) ConditionalOperator(Cond.take(), QuestionLoc,
5008 LHS.take(), ColonLoc,
5009 RHS.take(), result, VK, OK));
John McCall56ca35d2011-02-17 10:25:35 +00005010
5011 return Owned(new (Context)
John Wiegley429bb272011-04-08 18:41:53 +00005012 BinaryConditionalOperator(commonExpr, opaqueValue, Cond.take(), LHS.take(),
Richard Trieu67e29332011-08-02 04:35:43 +00005013 RHS.take(), QuestionLoc, ColonLoc, result, VK,
5014 OK));
Reid Spencer5f016e22007-07-11 17:01:13 +00005015}
5016
John McCalle4be87e2011-01-31 23:13:11 +00005017// checkPointerTypesForAssignment - This is a very tricky routine (despite
Mike Stumpeed9cac2009-02-19 03:04:26 +00005018// being closely modeled after the C99 spec:-). The odd characteristic of this
Reid Spencer5f016e22007-07-11 17:01:13 +00005019// routine is it effectively iqnores the qualifiers on the top level pointee.
5020// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3].
5021// FIXME: add a couple examples in this comment.
John McCalle4be87e2011-01-31 23:13:11 +00005022static Sema::AssignConvertType
5023checkPointerTypesForAssignment(Sema &S, QualType lhsType, QualType rhsType) {
5024 assert(lhsType.isCanonical() && "LHS not canonicalized!");
5025 assert(rhsType.isCanonical() && "RHS not canonicalized!");
Mike Stumpeed9cac2009-02-19 03:04:26 +00005026
Reid Spencer5f016e22007-07-11 17:01:13 +00005027 // get the "pointed to" type (ignoring qualifiers at the top level)
John McCall86c05f32011-02-01 00:10:29 +00005028 const Type *lhptee, *rhptee;
5029 Qualifiers lhq, rhq;
5030 llvm::tie(lhptee, lhq) = cast<PointerType>(lhsType)->getPointeeType().split();
5031 llvm::tie(rhptee, rhq) = cast<PointerType>(rhsType)->getPointeeType().split();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005032
John McCalle4be87e2011-01-31 23:13:11 +00005033 Sema::AssignConvertType ConvTy = Sema::Compatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005034
5035 // C99 6.5.16.1p1: This following citation is common to constraints
5036 // 3 & 4 (below). ...and the type *pointed to* by the left has all the
5037 // qualifiers of the type *pointed to* by the right;
John McCall86c05f32011-02-01 00:10:29 +00005038 Qualifiers lq;
5039
John McCallf85e1932011-06-15 23:02:42 +00005040 // As a special case, 'non-__weak A *' -> 'non-__weak const *' is okay.
5041 if (lhq.getObjCLifetime() != rhq.getObjCLifetime() &&
5042 lhq.compatiblyIncludesObjCLifetime(rhq)) {
5043 // Ignore lifetime for further calculation.
5044 lhq.removeObjCLifetime();
5045 rhq.removeObjCLifetime();
5046 }
5047
John McCall86c05f32011-02-01 00:10:29 +00005048 if (!lhq.compatiblyIncludes(rhq)) {
5049 // Treat address-space mismatches as fatal. TODO: address subspaces
5050 if (lhq.getAddressSpace() != rhq.getAddressSpace())
5051 ConvTy = Sema::IncompatiblePointerDiscardsQualifiers;
5052
John McCallf85e1932011-06-15 23:02:42 +00005053 // It's okay to add or remove GC or lifetime qualifiers when converting to
John McCall22348732011-03-26 02:56:45 +00005054 // and from void*.
John McCallf85e1932011-06-15 23:02:42 +00005055 else if (lhq.withoutObjCGCAttr().withoutObjCGLifetime()
5056 .compatiblyIncludes(
5057 rhq.withoutObjCGCAttr().withoutObjCGLifetime())
John McCall22348732011-03-26 02:56:45 +00005058 && (lhptee->isVoidType() || rhptee->isVoidType()))
5059 ; // keep old
5060
John McCallf85e1932011-06-15 23:02:42 +00005061 // Treat lifetime mismatches as fatal.
5062 else if (lhq.getObjCLifetime() != rhq.getObjCLifetime())
5063 ConvTy = Sema::IncompatiblePointerDiscardsQualifiers;
5064
John McCall86c05f32011-02-01 00:10:29 +00005065 // For GCC compatibility, other qualifier mismatches are treated
5066 // as still compatible in C.
5067 else ConvTy = Sema::CompatiblePointerDiscardsQualifiers;
5068 }
Reid Spencer5f016e22007-07-11 17:01:13 +00005069
Mike Stumpeed9cac2009-02-19 03:04:26 +00005070 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or
5071 // incomplete type and the other is a pointer to a qualified or unqualified
Reid Spencer5f016e22007-07-11 17:01:13 +00005072 // version of void...
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005073 if (lhptee->isVoidType()) {
Chris Lattnerd805bec2008-04-02 06:59:01 +00005074 if (rhptee->isIncompleteOrObjectType())
Chris Lattner5cf216b2008-01-04 18:04:52 +00005075 return ConvTy;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005076
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005077 // As an extension, we allow cast to/from void* to function pointer.
Chris Lattnerd805bec2008-04-02 06:59:01 +00005078 assert(rhptee->isFunctionType());
John McCalle4be87e2011-01-31 23:13:11 +00005079 return Sema::FunctionVoidPointer;
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005080 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005081
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005082 if (rhptee->isVoidType()) {
Chris Lattnerd805bec2008-04-02 06:59:01 +00005083 if (lhptee->isIncompleteOrObjectType())
Chris Lattner5cf216b2008-01-04 18:04:52 +00005084 return ConvTy;
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005085
5086 // As an extension, we allow cast to/from void* to function pointer.
Chris Lattnerd805bec2008-04-02 06:59:01 +00005087 assert(lhptee->isFunctionType());
John McCalle4be87e2011-01-31 23:13:11 +00005088 return Sema::FunctionVoidPointer;
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005089 }
John McCall86c05f32011-02-01 00:10:29 +00005090
Mike Stumpeed9cac2009-02-19 03:04:26 +00005091 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or
Reid Spencer5f016e22007-07-11 17:01:13 +00005092 // unqualified versions of compatible types, ...
John McCall86c05f32011-02-01 00:10:29 +00005093 QualType ltrans = QualType(lhptee, 0), rtrans = QualType(rhptee, 0);
5094 if (!S.Context.typesAreCompatible(ltrans, rtrans)) {
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005095 // Check if the pointee types are compatible ignoring the sign.
5096 // We explicitly check for char so that we catch "char" vs
5097 // "unsigned char" on systems where "char" is unsigned.
Chris Lattner6a2b9262009-10-17 20:33:28 +00005098 if (lhptee->isCharType())
John McCall86c05f32011-02-01 00:10:29 +00005099 ltrans = S.Context.UnsignedCharTy;
Douglas Gregorf6094622010-07-23 15:58:24 +00005100 else if (lhptee->hasSignedIntegerRepresentation())
John McCall86c05f32011-02-01 00:10:29 +00005101 ltrans = S.Context.getCorrespondingUnsignedType(ltrans);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005102
Chris Lattner6a2b9262009-10-17 20:33:28 +00005103 if (rhptee->isCharType())
John McCall86c05f32011-02-01 00:10:29 +00005104 rtrans = S.Context.UnsignedCharTy;
Douglas Gregorf6094622010-07-23 15:58:24 +00005105 else if (rhptee->hasSignedIntegerRepresentation())
John McCall86c05f32011-02-01 00:10:29 +00005106 rtrans = S.Context.getCorrespondingUnsignedType(rtrans);
Chris Lattner6a2b9262009-10-17 20:33:28 +00005107
John McCall86c05f32011-02-01 00:10:29 +00005108 if (ltrans == rtrans) {
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005109 // Types are compatible ignoring the sign. Qualifier incompatibility
5110 // takes priority over sign incompatibility because the sign
5111 // warning can be disabled.
John McCalle4be87e2011-01-31 23:13:11 +00005112 if (ConvTy != Sema::Compatible)
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005113 return ConvTy;
John McCall86c05f32011-02-01 00:10:29 +00005114
John McCalle4be87e2011-01-31 23:13:11 +00005115 return Sema::IncompatiblePointerSign;
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005116 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005117
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00005118 // If we are a multi-level pointer, it's possible that our issue is simply
5119 // one of qualification - e.g. char ** -> const char ** is not allowed. If
5120 // the eventual target type is the same and the pointers have the same
5121 // level of indirection, this must be the issue.
John McCalle4be87e2011-01-31 23:13:11 +00005122 if (isa<PointerType>(lhptee) && isa<PointerType>(rhptee)) {
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00005123 do {
John McCall86c05f32011-02-01 00:10:29 +00005124 lhptee = cast<PointerType>(lhptee)->getPointeeType().getTypePtr();
5125 rhptee = cast<PointerType>(rhptee)->getPointeeType().getTypePtr();
John McCalle4be87e2011-01-31 23:13:11 +00005126 } while (isa<PointerType>(lhptee) && isa<PointerType>(rhptee));
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005127
John McCall86c05f32011-02-01 00:10:29 +00005128 if (lhptee == rhptee)
John McCalle4be87e2011-01-31 23:13:11 +00005129 return Sema::IncompatibleNestedPointerQualifiers;
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00005130 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005131
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005132 // General pointer incompatibility takes priority over qualifiers.
John McCalle4be87e2011-01-31 23:13:11 +00005133 return Sema::IncompatiblePointer;
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005134 }
Chris Lattner5cf216b2008-01-04 18:04:52 +00005135 return ConvTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00005136}
5137
John McCalle4be87e2011-01-31 23:13:11 +00005138/// checkBlockPointerTypesForAssignment - This routine determines whether two
Steve Naroff1c7d0672008-09-04 15:10:53 +00005139/// block pointer types are compatible or whether a block and normal pointer
5140/// are compatible. It is more restrict than comparing two function pointer
5141// types.
John McCalle4be87e2011-01-31 23:13:11 +00005142static Sema::AssignConvertType
5143checkBlockPointerTypesForAssignment(Sema &S, QualType lhsType,
5144 QualType rhsType) {
5145 assert(lhsType.isCanonical() && "LHS not canonicalized!");
5146 assert(rhsType.isCanonical() && "RHS not canonicalized!");
5147
Steve Naroff1c7d0672008-09-04 15:10:53 +00005148 QualType lhptee, rhptee;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005149
Steve Naroff1c7d0672008-09-04 15:10:53 +00005150 // get the "pointed to" type (ignoring qualifiers at the top level)
John McCalle4be87e2011-01-31 23:13:11 +00005151 lhptee = cast<BlockPointerType>(lhsType)->getPointeeType();
5152 rhptee = cast<BlockPointerType>(rhsType)->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005153
John McCalle4be87e2011-01-31 23:13:11 +00005154 // In C++, the types have to match exactly.
5155 if (S.getLangOptions().CPlusPlus)
5156 return Sema::IncompatibleBlockPointer;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005157
John McCalle4be87e2011-01-31 23:13:11 +00005158 Sema::AssignConvertType ConvTy = Sema::Compatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005159
Steve Naroff1c7d0672008-09-04 15:10:53 +00005160 // For blocks we enforce that qualifiers are identical.
John McCalle4be87e2011-01-31 23:13:11 +00005161 if (lhptee.getLocalQualifiers() != rhptee.getLocalQualifiers())
5162 ConvTy = Sema::CompatiblePointerDiscardsQualifiers;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005163
John McCalle4be87e2011-01-31 23:13:11 +00005164 if (!S.Context.typesAreBlockPointerCompatible(lhsType, rhsType))
5165 return Sema::IncompatibleBlockPointer;
5166
Steve Naroff1c7d0672008-09-04 15:10:53 +00005167 return ConvTy;
5168}
5169
John McCalle4be87e2011-01-31 23:13:11 +00005170/// checkObjCPointerTypesForAssignment - Compares two objective-c pointer types
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00005171/// for assignment compatibility.
John McCalle4be87e2011-01-31 23:13:11 +00005172static Sema::AssignConvertType
Richard Trieu67e29332011-08-02 04:35:43 +00005173checkObjCPointerTypesForAssignment(Sema &S, QualType lhsType,
5174 QualType rhsType) {
John McCalle4be87e2011-01-31 23:13:11 +00005175 assert(lhsType.isCanonical() && "LHS was not canonicalized!");
5176 assert(rhsType.isCanonical() && "RHS was not canonicalized!");
5177
Fariborz Jahaniand4c60902010-03-19 18:06:10 +00005178 if (lhsType->isObjCBuiltinType()) {
5179 // Class is not compatible with ObjC object pointers.
Fariborz Jahanian528adb12010-03-24 21:00:27 +00005180 if (lhsType->isObjCClassType() && !rhsType->isObjCBuiltinType() &&
5181 !rhsType->isObjCQualifiedClassType())
John McCalle4be87e2011-01-31 23:13:11 +00005182 return Sema::IncompatiblePointer;
5183 return Sema::Compatible;
Fariborz Jahaniand4c60902010-03-19 18:06:10 +00005184 }
5185 if (rhsType->isObjCBuiltinType()) {
5186 // Class is not compatible with ObjC object pointers.
Fariborz Jahanian528adb12010-03-24 21:00:27 +00005187 if (rhsType->isObjCClassType() && !lhsType->isObjCBuiltinType() &&
5188 !lhsType->isObjCQualifiedClassType())
John McCalle4be87e2011-01-31 23:13:11 +00005189 return Sema::IncompatiblePointer;
5190 return Sema::Compatible;
Fariborz Jahaniand4c60902010-03-19 18:06:10 +00005191 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005192 QualType lhptee =
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00005193 lhsType->getAs<ObjCObjectPointerType>()->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005194 QualType rhptee =
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00005195 rhsType->getAs<ObjCObjectPointerType>()->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005196
John McCalle4be87e2011-01-31 23:13:11 +00005197 if (!lhptee.isAtLeastAsQualifiedAs(rhptee))
5198 return Sema::CompatiblePointerDiscardsQualifiers;
5199
5200 if (S.Context.typesAreCompatible(lhsType, rhsType))
5201 return Sema::Compatible;
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00005202 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType())
John McCalle4be87e2011-01-31 23:13:11 +00005203 return Sema::IncompatibleObjCQualifiedId;
5204 return Sema::IncompatiblePointer;
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00005205}
5206
John McCall1c23e912010-11-16 02:32:08 +00005207Sema::AssignConvertType
Douglas Gregorb608b982011-01-28 02:26:04 +00005208Sema::CheckAssignmentConstraints(SourceLocation Loc,
5209 QualType lhsType, QualType rhsType) {
John McCall1c23e912010-11-16 02:32:08 +00005210 // Fake up an opaque expression. We don't actually care about what
5211 // cast operations are required, so if CheckAssignmentConstraints
5212 // adds casts to this they'll be wasted, but fortunately that doesn't
5213 // usually happen on valid code.
Douglas Gregorb608b982011-01-28 02:26:04 +00005214 OpaqueValueExpr rhs(Loc, rhsType, VK_RValue);
John Wiegley429bb272011-04-08 18:41:53 +00005215 ExprResult rhsPtr = &rhs;
John McCall1c23e912010-11-16 02:32:08 +00005216 CastKind K = CK_Invalid;
5217
5218 return CheckAssignmentConstraints(lhsType, rhsPtr, K);
5219}
5220
Mike Stumpeed9cac2009-02-19 03:04:26 +00005221/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently
5222/// has code to accommodate several GCC extensions when type checking
Reid Spencer5f016e22007-07-11 17:01:13 +00005223/// pointers. Here are some objectionable examples that GCC considers warnings:
5224///
5225/// int a, *pint;
5226/// short *pshort;
5227/// struct foo *pfoo;
5228///
5229/// pint = pshort; // warning: assignment from incompatible pointer type
5230/// a = pint; // warning: assignment makes integer from pointer without a cast
5231/// pint = a; // warning: assignment makes pointer from integer without a cast
5232/// pint = pfoo; // warning: assignment from incompatible pointer type
5233///
5234/// As a result, the code for dealing with pointers is more complex than the
Mike Stumpeed9cac2009-02-19 03:04:26 +00005235/// C99 spec dictates.
Reid Spencer5f016e22007-07-11 17:01:13 +00005236///
John McCalldaa8e4e2010-11-15 09:13:47 +00005237/// Sets 'Kind' for any result kind except Incompatible.
Chris Lattner5cf216b2008-01-04 18:04:52 +00005238Sema::AssignConvertType
John Wiegley429bb272011-04-08 18:41:53 +00005239Sema::CheckAssignmentConstraints(QualType lhsType, ExprResult &rhs,
John McCalldaa8e4e2010-11-15 09:13:47 +00005240 CastKind &Kind) {
John Wiegley429bb272011-04-08 18:41:53 +00005241 QualType rhsType = rhs.get()->getType();
Fariborz Jahanian04e5a252011-07-07 18:55:47 +00005242 QualType origLhsType = lhsType;
John McCall1c23e912010-11-16 02:32:08 +00005243
Chris Lattnerfc144e22008-01-04 23:18:45 +00005244 // Get canonical types. We're not formatting these types, just comparing
5245 // them.
Chris Lattnerb77792e2008-07-26 22:17:49 +00005246 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType();
5247 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType();
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005248
John McCallb6cfa242011-01-31 22:28:28 +00005249 // Common case: no conversion required.
John McCalldaa8e4e2010-11-15 09:13:47 +00005250 if (lhsType == rhsType) {
5251 Kind = CK_NoOp;
John McCalldaa8e4e2010-11-15 09:13:47 +00005252 return Compatible;
David Chisnall0f436562009-08-17 16:35:33 +00005253 }
5254
Douglas Gregor9d293df2008-10-28 00:22:11 +00005255 // If the left-hand side is a reference type, then we are in a
5256 // (rare!) case where we've allowed the use of references in C,
5257 // e.g., as a parameter type in a built-in function. In this case,
5258 // just make sure that the type referenced is compatible with the
5259 // right-hand side type. The caller is responsible for adjusting
5260 // lhsType so that the resulting expression does not have reference
5261 // type.
Ted Kremenek6217b802009-07-29 21:53:49 +00005262 if (const ReferenceType *lhsTypeRef = lhsType->getAs<ReferenceType>()) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005263 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) {
5264 Kind = CK_LValueBitCast;
Anders Carlsson793680e2007-10-12 23:56:29 +00005265 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005266 }
Chris Lattnerfc144e22008-01-04 23:18:45 +00005267 return Incompatible;
Fariborz Jahanian411f3732007-12-19 17:45:58 +00005268 }
John McCallb6cfa242011-01-31 22:28:28 +00005269
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005270 // Allow scalar to ExtVector assignments, and assignments of an ExtVector type
5271 // to the same ExtVector type.
5272 if (lhsType->isExtVectorType()) {
5273 if (rhsType->isExtVectorType())
John McCalldaa8e4e2010-11-15 09:13:47 +00005274 return Incompatible;
5275 if (rhsType->isArithmeticType()) {
John McCall1c23e912010-11-16 02:32:08 +00005276 // CK_VectorSplat does T -> vector T, so first cast to the
5277 // element type.
5278 QualType elType = cast<ExtVectorType>(lhsType)->getElementType();
5279 if (elType != rhsType) {
5280 Kind = PrepareScalarCast(*this, rhs, elType);
John Wiegley429bb272011-04-08 18:41:53 +00005281 rhs = ImpCastExprToType(rhs.take(), elType, Kind);
John McCall1c23e912010-11-16 02:32:08 +00005282 }
5283 Kind = CK_VectorSplat;
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005284 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005285 }
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005286 }
Mike Stump1eb44332009-09-09 15:08:12 +00005287
John McCallb6cfa242011-01-31 22:28:28 +00005288 // Conversions to or from vector type.
Nate Begemanbe2341d2008-07-14 18:02:46 +00005289 if (lhsType->isVectorType() || rhsType->isVectorType()) {
Douglas Gregor255210e2010-08-06 10:14:59 +00005290 if (lhsType->isVectorType() && rhsType->isVectorType()) {
Bob Wilsonde3deea2010-12-02 00:25:15 +00005291 // Allow assignments of an AltiVec vector type to an equivalent GCC
5292 // vector type and vice versa
5293 if (Context.areCompatibleVectorTypes(lhsType, rhsType)) {
5294 Kind = CK_BitCast;
5295 return Compatible;
5296 }
5297
Douglas Gregor255210e2010-08-06 10:14:59 +00005298 // If we are allowing lax vector conversions, and LHS and RHS are both
5299 // vectors, the total size only needs to be the same. This is a bitcast;
5300 // no bits are changed but the result type is different.
5301 if (getLangOptions().LaxVectorConversions &&
John McCalldaa8e4e2010-11-15 09:13:47 +00005302 (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType))) {
John McCall0c6d28d2010-11-15 10:08:00 +00005303 Kind = CK_BitCast;
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00005304 return IncompatibleVectors;
John McCalldaa8e4e2010-11-15 09:13:47 +00005305 }
Chris Lattnere8b3e962008-01-04 23:32:24 +00005306 }
5307 return Incompatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005308 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005309
John McCallb6cfa242011-01-31 22:28:28 +00005310 // Arithmetic conversions.
Douglas Gregor88623ad2010-05-23 21:53:47 +00005311 if (lhsType->isArithmeticType() && rhsType->isArithmeticType() &&
John McCalldaa8e4e2010-11-15 09:13:47 +00005312 !(getLangOptions().CPlusPlus && lhsType->isEnumeralType())) {
John McCall1c23e912010-11-16 02:32:08 +00005313 Kind = PrepareScalarCast(*this, rhs, lhsType);
Reid Spencer5f016e22007-07-11 17:01:13 +00005314 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005315 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005316
John McCallb6cfa242011-01-31 22:28:28 +00005317 // Conversions to normal pointers.
5318 if (const PointerType *lhsPointer = dyn_cast<PointerType>(lhsType)) {
5319 // U* -> T*
John McCalldaa8e4e2010-11-15 09:13:47 +00005320 if (isa<PointerType>(rhsType)) {
5321 Kind = CK_BitCast;
John McCalle4be87e2011-01-31 23:13:11 +00005322 return checkPointerTypesForAssignment(*this, lhsType, rhsType);
John McCalldaa8e4e2010-11-15 09:13:47 +00005323 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005324
John McCallb6cfa242011-01-31 22:28:28 +00005325 // int -> T*
5326 if (rhsType->isIntegerType()) {
5327 Kind = CK_IntegralToPointer; // FIXME: null?
5328 return IntToPointer;
Steve Naroff14108da2009-07-10 23:34:53 +00005329 }
John McCallb6cfa242011-01-31 22:28:28 +00005330
5331 // C pointers are not compatible with ObjC object pointers,
5332 // with two exceptions:
5333 if (isa<ObjCObjectPointerType>(rhsType)) {
5334 // - conversions to void*
5335 if (lhsPointer->getPointeeType()->isVoidType()) {
5336 Kind = CK_AnyPointerToObjCPointerCast;
5337 return Compatible;
5338 }
5339
5340 // - conversions from 'Class' to the redefinition type
5341 if (rhsType->isObjCClassType() &&
5342 Context.hasSameType(lhsType, Context.ObjCClassRedefinitionType)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005343 Kind = CK_BitCast;
Douglas Gregor63a94902008-11-27 00:44:28 +00005344 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005345 }
Steve Naroffb4406862008-09-29 18:10:17 +00005346
John McCallb6cfa242011-01-31 22:28:28 +00005347 Kind = CK_BitCast;
5348 return IncompatiblePointer;
5349 }
5350
5351 // U^ -> void*
5352 if (rhsType->getAs<BlockPointerType>()) {
5353 if (lhsPointer->getPointeeType()->isVoidType()) {
5354 Kind = CK_BitCast;
Steve Naroffb4406862008-09-29 18:10:17 +00005355 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005356 }
Steve Naroffb4406862008-09-29 18:10:17 +00005357 }
John McCallb6cfa242011-01-31 22:28:28 +00005358
Steve Naroff1c7d0672008-09-04 15:10:53 +00005359 return Incompatible;
5360 }
5361
John McCallb6cfa242011-01-31 22:28:28 +00005362 // Conversions to block pointers.
Steve Naroff1c7d0672008-09-04 15:10:53 +00005363 if (isa<BlockPointerType>(lhsType)) {
John McCallb6cfa242011-01-31 22:28:28 +00005364 // U^ -> T^
5365 if (rhsType->isBlockPointerType()) {
5366 Kind = CK_AnyPointerToBlockPointerCast;
John McCalle4be87e2011-01-31 23:13:11 +00005367 return checkBlockPointerTypesForAssignment(*this, lhsType, rhsType);
John McCallb6cfa242011-01-31 22:28:28 +00005368 }
5369
5370 // int or null -> T^
John McCalldaa8e4e2010-11-15 09:13:47 +00005371 if (rhsType->isIntegerType()) {
5372 Kind = CK_IntegralToPointer; // FIXME: null
Eli Friedmand8f4f432009-02-25 04:20:42 +00005373 return IntToBlockPointer;
John McCalldaa8e4e2010-11-15 09:13:47 +00005374 }
5375
John McCallb6cfa242011-01-31 22:28:28 +00005376 // id -> T^
5377 if (getLangOptions().ObjC1 && rhsType->isObjCIdType()) {
5378 Kind = CK_AnyPointerToBlockPointerCast;
Steve Naroffb4406862008-09-29 18:10:17 +00005379 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00005380 }
Steve Naroffb4406862008-09-29 18:10:17 +00005381
John McCallb6cfa242011-01-31 22:28:28 +00005382 // void* -> T^
John McCalldaa8e4e2010-11-15 09:13:47 +00005383 if (const PointerType *RHSPT = rhsType->getAs<PointerType>())
John McCallb6cfa242011-01-31 22:28:28 +00005384 if (RHSPT->getPointeeType()->isVoidType()) {
5385 Kind = CK_AnyPointerToBlockPointerCast;
Douglas Gregor63a94902008-11-27 00:44:28 +00005386 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00005387 }
John McCalldaa8e4e2010-11-15 09:13:47 +00005388
Chris Lattnerfc144e22008-01-04 23:18:45 +00005389 return Incompatible;
5390 }
5391
John McCallb6cfa242011-01-31 22:28:28 +00005392 // Conversions to Objective-C pointers.
Steve Naroff14108da2009-07-10 23:34:53 +00005393 if (isa<ObjCObjectPointerType>(lhsType)) {
John McCallb6cfa242011-01-31 22:28:28 +00005394 // A* -> B*
5395 if (rhsType->isObjCObjectPointerType()) {
5396 Kind = CK_BitCast;
Fariborz Jahanian04e5a252011-07-07 18:55:47 +00005397 Sema::AssignConvertType result =
5398 checkObjCPointerTypesForAssignment(*this, lhsType, rhsType);
5399 if (getLangOptions().ObjCAutoRefCount &&
5400 result == Compatible &&
Fariborz Jahanian7a084ec2011-07-07 23:04:17 +00005401 !CheckObjCARCUnavailableWeakConversion(origLhsType, rhsType))
5402 result = IncompatibleObjCWeakRef;
Fariborz Jahanian04e5a252011-07-07 18:55:47 +00005403 return result;
John McCallb6cfa242011-01-31 22:28:28 +00005404 }
5405
5406 // int or null -> A*
John McCalldaa8e4e2010-11-15 09:13:47 +00005407 if (rhsType->isIntegerType()) {
5408 Kind = CK_IntegralToPointer; // FIXME: null
Steve Naroff14108da2009-07-10 23:34:53 +00005409 return IntToPointer;
John McCalldaa8e4e2010-11-15 09:13:47 +00005410 }
5411
John McCallb6cfa242011-01-31 22:28:28 +00005412 // In general, C pointers are not compatible with ObjC object pointers,
5413 // with two exceptions:
Steve Naroff14108da2009-07-10 23:34:53 +00005414 if (isa<PointerType>(rhsType)) {
John McCallb6cfa242011-01-31 22:28:28 +00005415 // - conversions from 'void*'
5416 if (rhsType->isVoidPointerType()) {
5417 Kind = CK_AnyPointerToObjCPointerCast;
Steve Naroff67ef8ea2009-07-20 17:56:53 +00005418 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00005419 }
5420
5421 // - conversions to 'Class' from its redefinition type
5422 if (lhsType->isObjCClassType() &&
5423 Context.hasSameType(rhsType, Context.ObjCClassRedefinitionType)) {
5424 Kind = CK_BitCast;
5425 return Compatible;
5426 }
5427
5428 Kind = CK_AnyPointerToObjCPointerCast;
Steve Naroff67ef8ea2009-07-20 17:56:53 +00005429 return IncompatiblePointer;
Steve Naroff14108da2009-07-10 23:34:53 +00005430 }
John McCallb6cfa242011-01-31 22:28:28 +00005431
5432 // T^ -> A*
5433 if (rhsType->isBlockPointerType()) {
5434 Kind = CK_AnyPointerToObjCPointerCast;
Steve Naroff14108da2009-07-10 23:34:53 +00005435 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00005436 }
5437
Steve Naroff14108da2009-07-10 23:34:53 +00005438 return Incompatible;
5439 }
John McCallb6cfa242011-01-31 22:28:28 +00005440
5441 // Conversions from pointers that are not covered by the above.
Chris Lattner78eca282008-04-07 06:49:41 +00005442 if (isa<PointerType>(rhsType)) {
John McCallb6cfa242011-01-31 22:28:28 +00005443 // T* -> _Bool
John McCalldaa8e4e2010-11-15 09:13:47 +00005444 if (lhsType == Context.BoolTy) {
5445 Kind = CK_PointerToBoolean;
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005446 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005447 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005448
John McCallb6cfa242011-01-31 22:28:28 +00005449 // T* -> int
John McCalldaa8e4e2010-11-15 09:13:47 +00005450 if (lhsType->isIntegerType()) {
5451 Kind = CK_PointerToIntegral;
Chris Lattnerb7b61152008-01-04 18:22:42 +00005452 return PointerToInt;
John McCalldaa8e4e2010-11-15 09:13:47 +00005453 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005454
Chris Lattnerfc144e22008-01-04 23:18:45 +00005455 return Incompatible;
Chris Lattnerfc144e22008-01-04 23:18:45 +00005456 }
John McCallb6cfa242011-01-31 22:28:28 +00005457
5458 // Conversions from Objective-C pointers that are not covered by the above.
Steve Naroff14108da2009-07-10 23:34:53 +00005459 if (isa<ObjCObjectPointerType>(rhsType)) {
John McCallb6cfa242011-01-31 22:28:28 +00005460 // T* -> _Bool
John McCalldaa8e4e2010-11-15 09:13:47 +00005461 if (lhsType == Context.BoolTy) {
5462 Kind = CK_PointerToBoolean;
Steve Naroff14108da2009-07-10 23:34:53 +00005463 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005464 }
Steve Naroff14108da2009-07-10 23:34:53 +00005465
John McCallb6cfa242011-01-31 22:28:28 +00005466 // T* -> int
John McCalldaa8e4e2010-11-15 09:13:47 +00005467 if (lhsType->isIntegerType()) {
5468 Kind = CK_PointerToIntegral;
Steve Naroff14108da2009-07-10 23:34:53 +00005469 return PointerToInt;
John McCalldaa8e4e2010-11-15 09:13:47 +00005470 }
5471
Steve Naroff14108da2009-07-10 23:34:53 +00005472 return Incompatible;
5473 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005474
John McCallb6cfa242011-01-31 22:28:28 +00005475 // struct A -> struct B
Chris Lattnerfc144e22008-01-04 23:18:45 +00005476 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005477 if (Context.typesAreCompatible(lhsType, rhsType)) {
5478 Kind = CK_NoOp;
Reid Spencer5f016e22007-07-11 17:01:13 +00005479 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005480 }
Reid Spencer5f016e22007-07-11 17:01:13 +00005481 }
John McCallb6cfa242011-01-31 22:28:28 +00005482
Reid Spencer5f016e22007-07-11 17:01:13 +00005483 return Incompatible;
5484}
5485
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005486/// \brief Constructs a transparent union from an expression that is
5487/// used to initialize the transparent union.
Richard Trieu67e29332011-08-02 04:35:43 +00005488static void ConstructTransparentUnion(Sema &S, ASTContext &C,
5489 ExprResult &EResult, QualType UnionType,
5490 FieldDecl *Field) {
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005491 // Build an initializer list that designates the appropriate member
5492 // of the transparent union.
John Wiegley429bb272011-04-08 18:41:53 +00005493 Expr *E = EResult.take();
Ted Kremenek709210f2010-04-13 23:39:13 +00005494 InitListExpr *Initializer = new (C) InitListExpr(C, SourceLocation(),
Ted Kremenekba7bc552010-02-19 01:50:18 +00005495 &E, 1,
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005496 SourceLocation());
5497 Initializer->setType(UnionType);
5498 Initializer->setInitializedFieldInUnion(Field);
5499
5500 // Build a compound literal constructing a value of the transparent
5501 // union type from this initializer list.
John McCall42f56b52010-01-18 19:35:47 +00005502 TypeSourceInfo *unionTInfo = C.getTrivialTypeSourceInfo(UnionType);
John Wiegley429bb272011-04-08 18:41:53 +00005503 EResult = S.Owned(
5504 new (C) CompoundLiteralExpr(SourceLocation(), unionTInfo, UnionType,
5505 VK_RValue, Initializer, false));
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005506}
5507
5508Sema::AssignConvertType
Richard Trieu67e29332011-08-02 04:35:43 +00005509Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType,
5510 ExprResult &rExpr) {
John Wiegley429bb272011-04-08 18:41:53 +00005511 QualType FromType = rExpr.get()->getType();
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005512
Mike Stump1eb44332009-09-09 15:08:12 +00005513 // If the ArgType is a Union type, we want to handle a potential
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005514 // transparent_union GCC extension.
5515 const RecordType *UT = ArgType->getAsUnionType();
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00005516 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>())
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005517 return Incompatible;
5518
5519 // The field to initialize within the transparent union.
5520 RecordDecl *UD = UT->getDecl();
5521 FieldDecl *InitField = 0;
5522 // It's compatible if the expression matches any of the fields.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00005523 for (RecordDecl::field_iterator it = UD->field_begin(),
5524 itend = UD->field_end();
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005525 it != itend; ++it) {
5526 if (it->getType()->isPointerType()) {
5527 // If the transparent union contains a pointer type, we allow:
5528 // 1) void pointer
5529 // 2) null pointer constant
5530 if (FromType->isPointerType())
Ted Kremenek6217b802009-07-29 21:53:49 +00005531 if (FromType->getAs<PointerType>()->getPointeeType()->isVoidType()) {
John Wiegley429bb272011-04-08 18:41:53 +00005532 rExpr = ImpCastExprToType(rExpr.take(), it->getType(), CK_BitCast);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005533 InitField = *it;
5534 break;
5535 }
Mike Stump1eb44332009-09-09 15:08:12 +00005536
John Wiegley429bb272011-04-08 18:41:53 +00005537 if (rExpr.get()->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00005538 Expr::NPC_ValueDependentIsNull)) {
Richard Trieu67e29332011-08-02 04:35:43 +00005539 rExpr = ImpCastExprToType(rExpr.take(), it->getType(),
5540 CK_NullToPointer);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005541 InitField = *it;
5542 break;
5543 }
5544 }
5545
John McCalldaa8e4e2010-11-15 09:13:47 +00005546 CastKind Kind = CK_Invalid;
John Wiegley429bb272011-04-08 18:41:53 +00005547 if (CheckAssignmentConstraints(it->getType(), rExpr, Kind)
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005548 == Compatible) {
John Wiegley429bb272011-04-08 18:41:53 +00005549 rExpr = ImpCastExprToType(rExpr.take(), it->getType(), Kind);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005550 InitField = *it;
5551 break;
5552 }
5553 }
5554
5555 if (!InitField)
5556 return Incompatible;
5557
John Wiegley429bb272011-04-08 18:41:53 +00005558 ConstructTransparentUnion(*this, Context, rExpr, ArgType, InitField);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005559 return Compatible;
5560}
5561
Chris Lattner5cf216b2008-01-04 18:04:52 +00005562Sema::AssignConvertType
John Wiegley429bb272011-04-08 18:41:53 +00005563Sema::CheckSingleAssignmentConstraints(QualType lhsType, ExprResult &rExpr) {
Douglas Gregor98cd5992008-10-21 23:43:52 +00005564 if (getLangOptions().CPlusPlus) {
5565 if (!lhsType->isRecordType()) {
5566 // C++ 5.17p3: If the left operand is not of class type, the
5567 // expression is implicitly converted (C++ 4) to the
5568 // cv-unqualified type of the left operand.
John Wiegley429bb272011-04-08 18:41:53 +00005569 ExprResult Res = PerformImplicitConversion(rExpr.get(),
5570 lhsType.getUnqualifiedType(),
5571 AA_Assigning);
5572 if (Res.isInvalid())
Douglas Gregor98cd5992008-10-21 23:43:52 +00005573 return Incompatible;
Fariborz Jahanian7a084ec2011-07-07 23:04:17 +00005574 Sema::AssignConvertType result = Compatible;
5575 if (getLangOptions().ObjCAutoRefCount &&
Richard Trieu67e29332011-08-02 04:35:43 +00005576 !CheckObjCARCUnavailableWeakConversion(lhsType,
5577 rExpr.get()->getType()))
Fariborz Jahanian7a084ec2011-07-07 23:04:17 +00005578 result = IncompatibleObjCWeakRef;
John Wiegley429bb272011-04-08 18:41:53 +00005579 rExpr = move(Res);
Fariborz Jahanian7a084ec2011-07-07 23:04:17 +00005580 return result;
Douglas Gregor98cd5992008-10-21 23:43:52 +00005581 }
5582
5583 // FIXME: Currently, we fall through and treat C++ classes like C
5584 // structures.
John McCallf6a16482010-12-04 03:47:34 +00005585 }
Douglas Gregor98cd5992008-10-21 23:43:52 +00005586
Steve Naroff529a4ad2007-11-27 17:58:44 +00005587 // C99 6.5.16.1p1: the left operand is a pointer and the right is
5588 // a null pointer constant.
Mike Stump1eb44332009-09-09 15:08:12 +00005589 if ((lhsType->isPointerType() ||
5590 lhsType->isObjCObjectPointerType() ||
Mike Stumpeed9cac2009-02-19 03:04:26 +00005591 lhsType->isBlockPointerType())
John Wiegley429bb272011-04-08 18:41:53 +00005592 && rExpr.get()->isNullPointerConstant(Context,
Richard Trieu67e29332011-08-02 04:35:43 +00005593 Expr::NPC_ValueDependentIsNull)) {
John Wiegley429bb272011-04-08 18:41:53 +00005594 rExpr = ImpCastExprToType(rExpr.take(), lhsType, CK_NullToPointer);
Steve Naroff529a4ad2007-11-27 17:58:44 +00005595 return Compatible;
5596 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005597
Chris Lattner943140e2007-10-16 02:55:40 +00005598 // This check seems unnatural, however it is necessary to ensure the proper
Steve Naroff90045e82007-07-13 23:32:42 +00005599 // conversion of functions/arrays. If the conversion were done for all
Douglas Gregor02a24ee2009-11-03 16:56:39 +00005600 // DeclExpr's (created by ActOnIdExpression), it would mess up the unary
Nick Lewyckyc133e9e2010-08-05 06:27:49 +00005601 // expressions that suppress this implicit conversion (&, sizeof).
Chris Lattner943140e2007-10-16 02:55:40 +00005602 //
Mike Stumpeed9cac2009-02-19 03:04:26 +00005603 // Suppress this for references: C++ 8.5.3p5.
John Wiegley429bb272011-04-08 18:41:53 +00005604 if (!lhsType->isReferenceType()) {
5605 rExpr = DefaultFunctionArrayLvalueConversion(rExpr.take());
5606 if (rExpr.isInvalid())
5607 return Incompatible;
5608 }
Steve Narofff1120de2007-08-24 22:33:52 +00005609
John McCalldaa8e4e2010-11-15 09:13:47 +00005610 CastKind Kind = CK_Invalid;
Chris Lattner5cf216b2008-01-04 18:04:52 +00005611 Sema::AssignConvertType result =
John McCall1c23e912010-11-16 02:32:08 +00005612 CheckAssignmentConstraints(lhsType, rExpr, Kind);
Mike Stumpeed9cac2009-02-19 03:04:26 +00005613
Steve Narofff1120de2007-08-24 22:33:52 +00005614 // C99 6.5.16.1p2: The value of the right operand is converted to the
5615 // type of the assignment expression.
Douglas Gregor9d293df2008-10-28 00:22:11 +00005616 // CheckAssignmentConstraints allows the left-hand side to be a reference,
5617 // so that we can use references in built-in functions even in C.
5618 // The getNonReferenceType() call makes sure that the resulting expression
5619 // does not have reference type.
John Wiegley429bb272011-04-08 18:41:53 +00005620 if (result != Incompatible && rExpr.get()->getType() != lhsType)
Richard Trieu67e29332011-08-02 04:35:43 +00005621 rExpr = ImpCastExprToType(rExpr.take(),
5622 lhsType.getNonLValueExprType(Context), Kind);
Steve Narofff1120de2007-08-24 22:33:52 +00005623 return result;
Steve Naroff90045e82007-07-13 23:32:42 +00005624}
5625
Richard Trieu67e29332011-08-02 04:35:43 +00005626QualType Sema::InvalidOperands(SourceLocation Loc, ExprResult &lex,
5627 ExprResult &rex) {
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00005628 Diag(Loc, diag::err_typecheck_invalid_operands)
John Wiegley429bb272011-04-08 18:41:53 +00005629 << lex.get()->getType() << rex.get()->getType()
5630 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Chris Lattnerca5eede2007-12-12 05:47:28 +00005631 return QualType();
Reid Spencer5f016e22007-07-11 17:01:13 +00005632}
5633
Eli Friedmanb9b4b782011-06-23 18:10:35 +00005634QualType Sema::CheckVectorOperands(ExprResult &lex, ExprResult &rex,
5635 SourceLocation Loc, bool isCompAssign) {
Mike Stumpeed9cac2009-02-19 03:04:26 +00005636 // For conversion purposes, we ignore any qualifiers.
Nate Begeman1330b0e2008-04-04 01:30:25 +00005637 // For example, "const float" and "float" are equivalent.
Chris Lattnerb77792e2008-07-26 22:17:49 +00005638 QualType lhsType =
John Wiegley429bb272011-04-08 18:41:53 +00005639 Context.getCanonicalType(lex.get()->getType()).getUnqualifiedType();
Chris Lattnerb77792e2008-07-26 22:17:49 +00005640 QualType rhsType =
John Wiegley429bb272011-04-08 18:41:53 +00005641 Context.getCanonicalType(rex.get()->getType()).getUnqualifiedType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005642
Nate Begemanbe2341d2008-07-14 18:02:46 +00005643 // If the vector types are identical, return.
Nate Begeman1330b0e2008-04-04 01:30:25 +00005644 if (lhsType == rhsType)
Reid Spencer5f016e22007-07-11 17:01:13 +00005645 return lhsType;
Nate Begeman4119d1a2007-12-30 02:59:45 +00005646
Douglas Gregor255210e2010-08-06 10:14:59 +00005647 // Handle the case of equivalent AltiVec and GCC vector types
5648 if (lhsType->isVectorType() && rhsType->isVectorType() &&
5649 Context.areCompatibleVectorTypes(lhsType, rhsType)) {
Eli Friedmanb9b4b782011-06-23 18:10:35 +00005650 if (lhsType->isExtVectorType()) {
5651 rex = ImpCastExprToType(rex.take(), lhsType, CK_BitCast);
5652 return lhsType;
5653 }
5654
5655 if (!isCompAssign)
5656 lex = ImpCastExprToType(lex.take(), rhsType, CK_BitCast);
Douglas Gregor255210e2010-08-06 10:14:59 +00005657 return rhsType;
5658 }
5659
Eli Friedmanb9b4b782011-06-23 18:10:35 +00005660 if (getLangOptions().LaxVectorConversions &&
5661 Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) {
5662 // If we are allowing lax vector conversions, and LHS and RHS are both
5663 // vectors, the total size only needs to be the same. This is a
5664 // bitcast; no bits are changed but the result type is different.
5665 // FIXME: Should we really be allowing this?
5666 rex = ImpCastExprToType(rex.take(), lhsType, CK_BitCast);
5667 return lhsType;
5668 }
5669
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005670 // Canonicalize the ExtVector to the LHS, remember if we swapped so we can
5671 // swap back (so that we don't reverse the inputs to a subtract, for instance.
5672 bool swapped = false;
Eli Friedmanb9b4b782011-06-23 18:10:35 +00005673 if (rhsType->isExtVectorType() && !isCompAssign) {
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005674 swapped = true;
5675 std::swap(rex, lex);
5676 std::swap(rhsType, lhsType);
5677 }
Mike Stump1eb44332009-09-09 15:08:12 +00005678
Nate Begemandde25982009-06-28 19:12:57 +00005679 // Handle the case of an ext vector and scalar.
John McCall183700f2009-09-21 23:43:11 +00005680 if (const ExtVectorType *LV = lhsType->getAs<ExtVectorType>()) {
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005681 QualType EltTy = LV->getElementType();
Douglas Gregor9d3347a2010-06-16 00:35:25 +00005682 if (EltTy->isIntegralType(Context) && rhsType->isIntegralType(Context)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005683 int order = Context.getIntegerTypeOrder(EltTy, rhsType);
5684 if (order > 0)
John Wiegley429bb272011-04-08 18:41:53 +00005685 rex = ImpCastExprToType(rex.take(), EltTy, CK_IntegralCast);
John McCalldaa8e4e2010-11-15 09:13:47 +00005686 if (order >= 0) {
John Wiegley429bb272011-04-08 18:41:53 +00005687 rex = ImpCastExprToType(rex.take(), lhsType, CK_VectorSplat);
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005688 if (swapped) std::swap(rex, lex);
5689 return lhsType;
5690 }
5691 }
5692 if (EltTy->isRealFloatingType() && rhsType->isScalarType() &&
5693 rhsType->isRealFloatingType()) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005694 int order = Context.getFloatingTypeOrder(EltTy, rhsType);
5695 if (order > 0)
John Wiegley429bb272011-04-08 18:41:53 +00005696 rex = ImpCastExprToType(rex.take(), EltTy, CK_FloatingCast);
John McCalldaa8e4e2010-11-15 09:13:47 +00005697 if (order >= 0) {
John Wiegley429bb272011-04-08 18:41:53 +00005698 rex = ImpCastExprToType(rex.take(), lhsType, CK_VectorSplat);
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005699 if (swapped) std::swap(rex, lex);
5700 return lhsType;
5701 }
Nate Begeman4119d1a2007-12-30 02:59:45 +00005702 }
5703 }
Mike Stump1eb44332009-09-09 15:08:12 +00005704
Nate Begemandde25982009-06-28 19:12:57 +00005705 // Vectors of different size or scalar and non-ext-vector are errors.
Eli Friedmanb9b4b782011-06-23 18:10:35 +00005706 if (swapped) std::swap(rex, lex);
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00005707 Diag(Loc, diag::err_typecheck_vector_not_convertable)
John Wiegley429bb272011-04-08 18:41:53 +00005708 << lex.get()->getType() << rex.get()->getType()
5709 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00005710 return QualType();
Sebastian Redl22460502009-02-07 00:15:38 +00005711}
5712
Richard Trieu67e29332011-08-02 04:35:43 +00005713QualType Sema::CheckMultiplyDivideOperands(ExprResult &lex, ExprResult &rex,
5714 SourceLocation Loc,
5715 bool isCompAssign, bool isDiv) {
5716 if (lex.get()->getType()->isVectorType() ||
5717 rex.get()->getType()->isVectorType())
Eli Friedmanb9b4b782011-06-23 18:10:35 +00005718 return CheckVectorOperands(lex, rex, Loc, isCompAssign);
Mike Stumpeed9cac2009-02-19 03:04:26 +00005719
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00005720 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign);
John Wiegley429bb272011-04-08 18:41:53 +00005721 if (lex.isInvalid() || rex.isInvalid())
5722 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005723
John Wiegley429bb272011-04-08 18:41:53 +00005724 if (!lex.get()->getType()->isArithmeticType() ||
5725 !rex.get()->getType()->isArithmeticType())
Chris Lattner7ef655a2010-01-12 21:23:57 +00005726 return InvalidOperands(Loc, lex, rex);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005727
Chris Lattner7ef655a2010-01-12 21:23:57 +00005728 // Check for division by zero.
5729 if (isDiv &&
Richard Trieu67e29332011-08-02 04:35:43 +00005730 rex.get()->isNullPointerConstant(Context,
5731 Expr::NPC_ValueDependentIsNotNull))
John Wiegley429bb272011-04-08 18:41:53 +00005732 DiagRuntimeBehavior(Loc, rex.get(), PDiag(diag::warn_division_by_zero)
Richard Trieu67e29332011-08-02 04:35:43 +00005733 << rex.get()->getSourceRange());
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005734
Chris Lattner7ef655a2010-01-12 21:23:57 +00005735 return compType;
Reid Spencer5f016e22007-07-11 17:01:13 +00005736}
5737
Chris Lattner7ef655a2010-01-12 21:23:57 +00005738QualType Sema::CheckRemainderOperands(
John Wiegley429bb272011-04-08 18:41:53 +00005739 ExprResult &lex, ExprResult &rex, SourceLocation Loc, bool isCompAssign) {
Richard Trieu67e29332011-08-02 04:35:43 +00005740 if (lex.get()->getType()->isVectorType() ||
5741 rex.get()->getType()->isVectorType()) {
John Wiegley429bb272011-04-08 18:41:53 +00005742 if (lex.get()->getType()->hasIntegerRepresentation() &&
5743 rex.get()->getType()->hasIntegerRepresentation())
Eli Friedmanb9b4b782011-06-23 18:10:35 +00005744 return CheckVectorOperands(lex, rex, Loc, isCompAssign);
Daniel Dunbar523aa602009-01-05 22:55:36 +00005745 return InvalidOperands(Loc, lex, rex);
5746 }
Steve Naroff90045e82007-07-13 23:32:42 +00005747
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00005748 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign);
John Wiegley429bb272011-04-08 18:41:53 +00005749 if (lex.isInvalid() || rex.isInvalid())
5750 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005751
Richard Trieu67e29332011-08-02 04:35:43 +00005752 if (!lex.get()->getType()->isIntegerType() ||
5753 !rex.get()->getType()->isIntegerType())
Chris Lattner7ef655a2010-01-12 21:23:57 +00005754 return InvalidOperands(Loc, lex, rex);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005755
Chris Lattner7ef655a2010-01-12 21:23:57 +00005756 // Check for remainder by zero.
Richard Trieu67e29332011-08-02 04:35:43 +00005757 if (rex.get()->isNullPointerConstant(Context,
5758 Expr::NPC_ValueDependentIsNotNull))
John Wiegley429bb272011-04-08 18:41:53 +00005759 DiagRuntimeBehavior(Loc, rex.get(), PDiag(diag::warn_remainder_by_zero)
5760 << rex.get()->getSourceRange());
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005761
Chris Lattner7ef655a2010-01-12 21:23:57 +00005762 return compType;
Reid Spencer5f016e22007-07-11 17:01:13 +00005763}
5764
Chandler Carruth13b21be2011-06-27 08:02:19 +00005765/// \brief Diagnose invalid arithmetic on two void pointers.
5766static void diagnoseArithmeticOnTwoVoidPointers(Sema &S, SourceLocation Loc,
5767 Expr *LHS, Expr *RHS) {
5768 S.Diag(Loc, S.getLangOptions().CPlusPlus
5769 ? diag::err_typecheck_pointer_arith_void_type
5770 : diag::ext_gnu_void_ptr)
5771 << 1 /* two pointers */ << LHS->getSourceRange() << RHS->getSourceRange();
5772}
5773
5774/// \brief Diagnose invalid arithmetic on a void pointer.
5775static void diagnoseArithmeticOnVoidPointer(Sema &S, SourceLocation Loc,
5776 Expr *Pointer) {
5777 S.Diag(Loc, S.getLangOptions().CPlusPlus
5778 ? diag::err_typecheck_pointer_arith_void_type
5779 : diag::ext_gnu_void_ptr)
5780 << 0 /* one pointer */ << Pointer->getSourceRange();
5781}
5782
5783/// \brief Diagnose invalid arithmetic on two function pointers.
5784static void diagnoseArithmeticOnTwoFunctionPointers(Sema &S, SourceLocation Loc,
5785 Expr *LHS, Expr *RHS) {
5786 assert(LHS->getType()->isAnyPointerType());
5787 assert(RHS->getType()->isAnyPointerType());
5788 S.Diag(Loc, S.getLangOptions().CPlusPlus
5789 ? diag::err_typecheck_pointer_arith_function_type
5790 : diag::ext_gnu_ptr_func_arith)
5791 << 1 /* two pointers */ << LHS->getType()->getPointeeType()
5792 // We only show the second type if it differs from the first.
5793 << (unsigned)!S.Context.hasSameUnqualifiedType(LHS->getType(),
5794 RHS->getType())
5795 << RHS->getType()->getPointeeType()
5796 << LHS->getSourceRange() << RHS->getSourceRange();
5797}
5798
5799/// \brief Diagnose invalid arithmetic on a function pointer.
5800static void diagnoseArithmeticOnFunctionPointer(Sema &S, SourceLocation Loc,
5801 Expr *Pointer) {
5802 assert(Pointer->getType()->isAnyPointerType());
5803 S.Diag(Loc, S.getLangOptions().CPlusPlus
5804 ? diag::err_typecheck_pointer_arith_function_type
5805 : diag::ext_gnu_ptr_func_arith)
5806 << 0 /* one pointer */ << Pointer->getType()->getPointeeType()
5807 << 0 /* one pointer, so only one type */
5808 << Pointer->getSourceRange();
5809}
5810
5811/// \brief Check the validity of an arithmetic pointer operand.
5812///
5813/// If the operand has pointer type, this code will check for pointer types
5814/// which are invalid in arithmetic operations. These will be diagnosed
5815/// appropriately, including whether or not the use is supported as an
5816/// extension.
5817///
5818/// \returns True when the operand is valid to use (even if as an extension).
5819static bool checkArithmeticOpPointerOperand(Sema &S, SourceLocation Loc,
5820 Expr *Operand) {
5821 if (!Operand->getType()->isAnyPointerType()) return true;
5822
5823 QualType PointeeTy = Operand->getType()->getPointeeType();
5824 if (PointeeTy->isVoidType()) {
5825 diagnoseArithmeticOnVoidPointer(S, Loc, Operand);
5826 return !S.getLangOptions().CPlusPlus;
5827 }
5828 if (PointeeTy->isFunctionType()) {
5829 diagnoseArithmeticOnFunctionPointer(S, Loc, Operand);
5830 return !S.getLangOptions().CPlusPlus;
5831 }
5832
5833 if ((Operand->getType()->isPointerType() &&
5834 !Operand->getType()->isDependentType()) ||
5835 Operand->getType()->isObjCObjectPointerType()) {
5836 QualType PointeeTy = Operand->getType()->getPointeeType();
5837 if (S.RequireCompleteType(
5838 Loc, PointeeTy,
5839 S.PDiag(diag::err_typecheck_arithmetic_incomplete_type)
5840 << PointeeTy << Operand->getSourceRange()))
5841 return false;
5842 }
5843
5844 return true;
5845}
5846
5847/// \brief Check the validity of a binary arithmetic operation w.r.t. pointer
5848/// operands.
5849///
5850/// This routine will diagnose any invalid arithmetic on pointer operands much
5851/// like \see checkArithmeticOpPointerOperand. However, it has special logic
5852/// for emitting a single diagnostic even for operations where both LHS and RHS
5853/// are (potentially problematic) pointers.
5854///
5855/// \returns True when the operand is valid to use (even if as an extension).
5856static bool checkArithmeticBinOpPointerOperands(Sema &S, SourceLocation Loc,
5857 Expr *LHS, Expr *RHS) {
5858 bool isLHSPointer = LHS->getType()->isAnyPointerType();
5859 bool isRHSPointer = RHS->getType()->isAnyPointerType();
5860 if (!isLHSPointer && !isRHSPointer) return true;
5861
5862 QualType LHSPointeeTy, RHSPointeeTy;
5863 if (isLHSPointer) LHSPointeeTy = LHS->getType()->getPointeeType();
5864 if (isRHSPointer) RHSPointeeTy = RHS->getType()->getPointeeType();
5865
5866 // Check for arithmetic on pointers to incomplete types.
5867 bool isLHSVoidPtr = isLHSPointer && LHSPointeeTy->isVoidType();
5868 bool isRHSVoidPtr = isRHSPointer && RHSPointeeTy->isVoidType();
5869 if (isLHSVoidPtr || isRHSVoidPtr) {
5870 if (!isRHSVoidPtr) diagnoseArithmeticOnVoidPointer(S, Loc, LHS);
5871 else if (!isLHSVoidPtr) diagnoseArithmeticOnVoidPointer(S, Loc, RHS);
5872 else diagnoseArithmeticOnTwoVoidPointers(S, Loc, LHS, RHS);
5873
5874 return !S.getLangOptions().CPlusPlus;
5875 }
5876
5877 bool isLHSFuncPtr = isLHSPointer && LHSPointeeTy->isFunctionType();
5878 bool isRHSFuncPtr = isRHSPointer && RHSPointeeTy->isFunctionType();
5879 if (isLHSFuncPtr || isRHSFuncPtr) {
5880 if (!isRHSFuncPtr) diagnoseArithmeticOnFunctionPointer(S, Loc, LHS);
5881 else if (!isLHSFuncPtr) diagnoseArithmeticOnFunctionPointer(S, Loc, RHS);
5882 else diagnoseArithmeticOnTwoFunctionPointers(S, Loc, LHS, RHS);
5883
5884 return !S.getLangOptions().CPlusPlus;
5885 }
5886
5887 Expr *Operands[] = { LHS, RHS };
5888 for (unsigned i = 0; i < 2; ++i) {
5889 Expr *Operand = Operands[i];
5890 if ((Operand->getType()->isPointerType() &&
5891 !Operand->getType()->isDependentType()) ||
5892 Operand->getType()->isObjCObjectPointerType()) {
5893 QualType PointeeTy = Operand->getType()->getPointeeType();
5894 if (S.RequireCompleteType(
5895 Loc, PointeeTy,
5896 S.PDiag(diag::err_typecheck_arithmetic_incomplete_type)
5897 << PointeeTy << Operand->getSourceRange()))
5898 return false;
5899 }
5900 }
5901 return true;
5902}
5903
Chris Lattner7ef655a2010-01-12 21:23:57 +00005904QualType Sema::CheckAdditionOperands( // C99 6.5.6
John Wiegley429bb272011-04-08 18:41:53 +00005905 ExprResult &lex, ExprResult &rex, SourceLocation Loc, QualType* CompLHSTy) {
Richard Trieu67e29332011-08-02 04:35:43 +00005906 if (lex.get()->getType()->isVectorType() ||
5907 rex.get()->getType()->isVectorType()) {
Eli Friedmanb9b4b782011-06-23 18:10:35 +00005908 QualType compType = CheckVectorOperands(lex, rex, Loc, CompLHSTy);
Eli Friedmanab3a8522009-03-28 01:22:36 +00005909 if (CompLHSTy) *CompLHSTy = compType;
5910 return compType;
5911 }
Steve Naroff49b45262007-07-13 16:58:59 +00005912
Eli Friedmanab3a8522009-03-28 01:22:36 +00005913 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy);
John Wiegley429bb272011-04-08 18:41:53 +00005914 if (lex.isInvalid() || rex.isInvalid())
5915 return QualType();
Eli Friedmand72d16e2008-05-18 18:08:51 +00005916
Reid Spencer5f016e22007-07-11 17:01:13 +00005917 // handle the common case first (both operands are arithmetic).
John Wiegley429bb272011-04-08 18:41:53 +00005918 if (lex.get()->getType()->isArithmeticType() &&
5919 rex.get()->getType()->isArithmeticType()) {
Eli Friedmanab3a8522009-03-28 01:22:36 +00005920 if (CompLHSTy) *CompLHSTy = compType;
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00005921 return compType;
Eli Friedmanab3a8522009-03-28 01:22:36 +00005922 }
Reid Spencer5f016e22007-07-11 17:01:13 +00005923
Eli Friedmand72d16e2008-05-18 18:08:51 +00005924 // Put any potential pointer into PExp
John Wiegley429bb272011-04-08 18:41:53 +00005925 Expr* PExp = lex.get(), *IExp = rex.get();
Steve Naroff58f9f2c2009-07-14 18:25:06 +00005926 if (IExp->getType()->isAnyPointerType())
Eli Friedmand72d16e2008-05-18 18:08:51 +00005927 std::swap(PExp, IExp);
5928
Steve Naroff58f9f2c2009-07-14 18:25:06 +00005929 if (PExp->getType()->isAnyPointerType()) {
Eli Friedmand72d16e2008-05-18 18:08:51 +00005930 if (IExp->getType()->isIntegerType()) {
Chandler Carruth13b21be2011-06-27 08:02:19 +00005931 if (!checkArithmeticOpPointerOperand(*this, Loc, PExp))
5932 return QualType();
5933
Steve Naroff760e3c42009-07-13 21:20:41 +00005934 QualType PointeeTy = PExp->getType()->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00005935
Chris Lattnerb5f15622009-04-24 23:50:08 +00005936 // Diagnose bad cases where we step over interface counts.
John McCallc12c5bb2010-05-15 11:32:37 +00005937 if (PointeeTy->isObjCObjectType() && LangOpts.ObjCNonFragileABI) {
Chris Lattnerb5f15622009-04-24 23:50:08 +00005938 Diag(Loc, diag::err_arithmetic_nonfragile_interface)
5939 << PointeeTy << PExp->getSourceRange();
5940 return QualType();
5941 }
Mike Stump1eb44332009-09-09 15:08:12 +00005942
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00005943 // Check array bounds for pointer arithemtic
5944 CheckArrayAccess(PExp, IExp);
5945
Eli Friedmanab3a8522009-03-28 01:22:36 +00005946 if (CompLHSTy) {
John Wiegley429bb272011-04-08 18:41:53 +00005947 QualType LHSTy = Context.isPromotableBitField(lex.get());
Eli Friedman04e83572009-08-20 04:21:42 +00005948 if (LHSTy.isNull()) {
John Wiegley429bb272011-04-08 18:41:53 +00005949 LHSTy = lex.get()->getType();
Eli Friedman04e83572009-08-20 04:21:42 +00005950 if (LHSTy->isPromotableIntegerType())
5951 LHSTy = Context.getPromotedIntegerType(LHSTy);
Douglas Gregor2d833e32009-05-02 00:36:19 +00005952 }
Eli Friedmanab3a8522009-03-28 01:22:36 +00005953 *CompLHSTy = LHSTy;
5954 }
Eli Friedmand72d16e2008-05-18 18:08:51 +00005955 return PExp->getType();
5956 }
5957 }
5958
Chris Lattner29a1cfb2008-11-18 01:30:42 +00005959 return InvalidOperands(Loc, lex, rex);
Reid Spencer5f016e22007-07-11 17:01:13 +00005960}
5961
Chris Lattnereca7be62008-04-07 05:30:13 +00005962// C99 6.5.6
John Wiegley429bb272011-04-08 18:41:53 +00005963QualType Sema::CheckSubtractionOperands(ExprResult &lex, ExprResult &rex,
Richard Trieu67e29332011-08-02 04:35:43 +00005964 SourceLocation Loc,
5965 QualType* CompLHSTy) {
5966 if (lex.get()->getType()->isVectorType() ||
5967 rex.get()->getType()->isVectorType()) {
Eli Friedmanb9b4b782011-06-23 18:10:35 +00005968 QualType compType = CheckVectorOperands(lex, rex, Loc, CompLHSTy);
Eli Friedmanab3a8522009-03-28 01:22:36 +00005969 if (CompLHSTy) *CompLHSTy = compType;
5970 return compType;
5971 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005972
Eli Friedmanab3a8522009-03-28 01:22:36 +00005973 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy);
John Wiegley429bb272011-04-08 18:41:53 +00005974 if (lex.isInvalid() || rex.isInvalid())
5975 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005976
Chris Lattner6e4ab612007-12-09 21:53:25 +00005977 // Enforce type constraints: C99 6.5.6p3.
Mike Stumpeed9cac2009-02-19 03:04:26 +00005978
Chris Lattner6e4ab612007-12-09 21:53:25 +00005979 // Handle the common case first (both operands are arithmetic).
John Wiegley429bb272011-04-08 18:41:53 +00005980 if (lex.get()->getType()->isArithmeticType() &&
5981 rex.get()->getType()->isArithmeticType()) {
Eli Friedmanab3a8522009-03-28 01:22:36 +00005982 if (CompLHSTy) *CompLHSTy = compType;
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00005983 return compType;
Eli Friedmanab3a8522009-03-28 01:22:36 +00005984 }
Mike Stump1eb44332009-09-09 15:08:12 +00005985
Chris Lattner6e4ab612007-12-09 21:53:25 +00005986 // Either ptr - int or ptr - ptr.
John Wiegley429bb272011-04-08 18:41:53 +00005987 if (lex.get()->getType()->isAnyPointerType()) {
5988 QualType lpointee = lex.get()->getType()->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005989
Chris Lattnerb5f15622009-04-24 23:50:08 +00005990 // Diagnose bad cases where we step over interface counts.
John McCallc12c5bb2010-05-15 11:32:37 +00005991 if (lpointee->isObjCObjectType() && LangOpts.ObjCNonFragileABI) {
Chris Lattnerb5f15622009-04-24 23:50:08 +00005992 Diag(Loc, diag::err_arithmetic_nonfragile_interface)
John Wiegley429bb272011-04-08 18:41:53 +00005993 << lpointee << lex.get()->getSourceRange();
Chris Lattnerb5f15622009-04-24 23:50:08 +00005994 return QualType();
5995 }
Mike Stump1eb44332009-09-09 15:08:12 +00005996
Chris Lattner6e4ab612007-12-09 21:53:25 +00005997 // The result type of a pointer-int computation is the pointer type.
John Wiegley429bb272011-04-08 18:41:53 +00005998 if (rex.get()->getType()->isIntegerType()) {
Chandler Carruth13b21be2011-06-27 08:02:19 +00005999 if (!checkArithmeticOpPointerOperand(*this, Loc, lex.get()))
6000 return QualType();
Douglas Gregore7450f52009-03-24 19:52:54 +00006001
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00006002 Expr *IExpr = rex.get()->IgnoreParenCasts();
6003 UnaryOperator negRex(IExpr, UO_Minus, IExpr->getType(), VK_RValue,
6004 OK_Ordinary, IExpr->getExprLoc());
6005 // Check array bounds for pointer arithemtic
6006 CheckArrayAccess(lex.get()->IgnoreParenCasts(), &negRex);
6007
John Wiegley429bb272011-04-08 18:41:53 +00006008 if (CompLHSTy) *CompLHSTy = lex.get()->getType();
6009 return lex.get()->getType();
Douglas Gregore7450f52009-03-24 19:52:54 +00006010 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006011
Chris Lattner6e4ab612007-12-09 21:53:25 +00006012 // Handle pointer-pointer subtractions.
Richard Trieu67e29332011-08-02 04:35:43 +00006013 if (const PointerType *RHSPTy
6014 = rex.get()->getType()->getAs<PointerType>()) {
Eli Friedman8e54ad02008-02-08 01:19:44 +00006015 QualType rpointee = RHSPTy->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006016
Eli Friedman88d936b2009-05-16 13:54:38 +00006017 if (getLangOptions().CPlusPlus) {
6018 // Pointee types must be the same: C++ [expr.add]
6019 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) {
6020 Diag(Loc, diag::err_typecheck_sub_ptr_compatible)
John Wiegley429bb272011-04-08 18:41:53 +00006021 << lex.get()->getType() << rex.get()->getType()
6022 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Eli Friedman88d936b2009-05-16 13:54:38 +00006023 return QualType();
6024 }
6025 } else {
6026 // Pointee types must be compatible C99 6.5.6p3
6027 if (!Context.typesAreCompatible(
6028 Context.getCanonicalType(lpointee).getUnqualifiedType(),
6029 Context.getCanonicalType(rpointee).getUnqualifiedType())) {
6030 Diag(Loc, diag::err_typecheck_sub_ptr_compatible)
John Wiegley429bb272011-04-08 18:41:53 +00006031 << lex.get()->getType() << rex.get()->getType()
6032 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Eli Friedman88d936b2009-05-16 13:54:38 +00006033 return QualType();
6034 }
Chris Lattner6e4ab612007-12-09 21:53:25 +00006035 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006036
Chandler Carruth13b21be2011-06-27 08:02:19 +00006037 if (!checkArithmeticBinOpPointerOperands(*this, Loc,
6038 lex.get(), rex.get()))
6039 return QualType();
Eli Friedmanab3a8522009-03-28 01:22:36 +00006040
John Wiegley429bb272011-04-08 18:41:53 +00006041 if (CompLHSTy) *CompLHSTy = lex.get()->getType();
Chris Lattner6e4ab612007-12-09 21:53:25 +00006042 return Context.getPointerDiffType();
6043 }
6044 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006045
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006046 return InvalidOperands(Loc, lex, rex);
Reid Spencer5f016e22007-07-11 17:01:13 +00006047}
6048
Douglas Gregor1274ccd2010-10-08 23:50:27 +00006049static bool isScopedEnumerationType(QualType T) {
6050 if (const EnumType *ET = dyn_cast<EnumType>(T))
6051 return ET->getDecl()->isScoped();
6052 return false;
6053}
6054
John Wiegley429bb272011-04-08 18:41:53 +00006055static void DiagnoseBadShiftValues(Sema& S, ExprResult &lex, ExprResult &rex,
Chandler Carruth21206d52011-02-23 23:34:11 +00006056 SourceLocation Loc, unsigned Opc,
6057 QualType LHSTy) {
6058 llvm::APSInt Right;
6059 // Check right/shifter operand
Richard Trieu67e29332011-08-02 04:35:43 +00006060 if (rex.get()->isValueDependent() ||
6061 !rex.get()->isIntegerConstantExpr(Right, S.Context))
Chandler Carruth21206d52011-02-23 23:34:11 +00006062 return;
6063
6064 if (Right.isNegative()) {
John Wiegley429bb272011-04-08 18:41:53 +00006065 S.DiagRuntimeBehavior(Loc, rex.get(),
Ted Kremenek082bf7a2011-03-01 18:09:31 +00006066 S.PDiag(diag::warn_shift_negative)
John Wiegley429bb272011-04-08 18:41:53 +00006067 << rex.get()->getSourceRange());
Chandler Carruth21206d52011-02-23 23:34:11 +00006068 return;
6069 }
6070 llvm::APInt LeftBits(Right.getBitWidth(),
John Wiegley429bb272011-04-08 18:41:53 +00006071 S.Context.getTypeSize(lex.get()->getType()));
Chandler Carruth21206d52011-02-23 23:34:11 +00006072 if (Right.uge(LeftBits)) {
John Wiegley429bb272011-04-08 18:41:53 +00006073 S.DiagRuntimeBehavior(Loc, rex.get(),
Ted Kremenek425a31e2011-03-01 19:13:22 +00006074 S.PDiag(diag::warn_shift_gt_typewidth)
John Wiegley429bb272011-04-08 18:41:53 +00006075 << rex.get()->getSourceRange());
Chandler Carruth21206d52011-02-23 23:34:11 +00006076 return;
6077 }
6078 if (Opc != BO_Shl)
6079 return;
6080
6081 // When left shifting an ICE which is signed, we can check for overflow which
6082 // according to C++ has undefined behavior ([expr.shift] 5.8/2). Unsigned
6083 // integers have defined behavior modulo one more than the maximum value
6084 // representable in the result type, so never warn for those.
6085 llvm::APSInt Left;
Richard Trieu67e29332011-08-02 04:35:43 +00006086 if (lex.get()->isValueDependent() ||
6087 !lex.get()->isIntegerConstantExpr(Left, S.Context) ||
Chandler Carruth21206d52011-02-23 23:34:11 +00006088 LHSTy->hasUnsignedIntegerRepresentation())
6089 return;
6090 llvm::APInt ResultBits =
6091 static_cast<llvm::APInt&>(Right) + Left.getMinSignedBits();
6092 if (LeftBits.uge(ResultBits))
6093 return;
6094 llvm::APSInt Result = Left.extend(ResultBits.getLimitedValue());
6095 Result = Result.shl(Right);
6096
Ted Kremenekfa821382011-06-15 00:54:52 +00006097 // Print the bit representation of the signed integer as an unsigned
6098 // hexadecimal number.
6099 llvm::SmallString<40> HexResult;
6100 Result.toString(HexResult, 16, /*Signed =*/false, /*Literal =*/true);
6101
Chandler Carruth21206d52011-02-23 23:34:11 +00006102 // If we are only missing a sign bit, this is less likely to result in actual
6103 // bugs -- if the result is cast back to an unsigned type, it will have the
6104 // expected value. Thus we place this behind a different warning that can be
6105 // turned off separately if needed.
6106 if (LeftBits == ResultBits - 1) {
Ted Kremenekfa821382011-06-15 00:54:52 +00006107 S.Diag(Loc, diag::warn_shift_result_sets_sign_bit)
6108 << HexResult.str() << LHSTy
John Wiegley429bb272011-04-08 18:41:53 +00006109 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Chandler Carruth21206d52011-02-23 23:34:11 +00006110 return;
6111 }
6112
6113 S.Diag(Loc, diag::warn_shift_result_gt_typewidth)
Ted Kremenekfa821382011-06-15 00:54:52 +00006114 << HexResult.str() << Result.getMinSignedBits() << LHSTy
Richard Trieu67e29332011-08-02 04:35:43 +00006115 << Left.getBitWidth() << lex.get()->getSourceRange()
6116 << rex.get()->getSourceRange();
Chandler Carruth21206d52011-02-23 23:34:11 +00006117}
6118
Chris Lattnereca7be62008-04-07 05:30:13 +00006119// C99 6.5.7
Richard Trieu67e29332011-08-02 04:35:43 +00006120QualType Sema::CheckShiftOperands(ExprResult &lex, ExprResult &rex,
6121 SourceLocation Loc, unsigned Opc,
6122 bool isCompAssign) {
Chris Lattnerca5eede2007-12-12 05:47:28 +00006123 // C99 6.5.7p2: Each of the operands shall have integer type.
John Wiegley429bb272011-04-08 18:41:53 +00006124 if (!lex.get()->getType()->hasIntegerRepresentation() ||
6125 !rex.get()->getType()->hasIntegerRepresentation())
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006126 return InvalidOperands(Loc, lex, rex);
Mike Stumpeed9cac2009-02-19 03:04:26 +00006127
Douglas Gregor1274ccd2010-10-08 23:50:27 +00006128 // C++0x: Don't allow scoped enums. FIXME: Use something better than
6129 // hasIntegerRepresentation() above instead of this.
John Wiegley429bb272011-04-08 18:41:53 +00006130 if (isScopedEnumerationType(lex.get()->getType()) ||
6131 isScopedEnumerationType(rex.get()->getType())) {
Douglas Gregor1274ccd2010-10-08 23:50:27 +00006132 return InvalidOperands(Loc, lex, rex);
6133 }
6134
Nate Begeman2207d792009-10-25 02:26:48 +00006135 // Vector shifts promote their scalar inputs to vector type.
Richard Trieu67e29332011-08-02 04:35:43 +00006136 if (lex.get()->getType()->isVectorType() ||
6137 rex.get()->getType()->isVectorType())
Eli Friedmanb9b4b782011-06-23 18:10:35 +00006138 return CheckVectorOperands(lex, rex, Loc, isCompAssign);
Nate Begeman2207d792009-10-25 02:26:48 +00006139
Chris Lattnerca5eede2007-12-12 05:47:28 +00006140 // Shifts don't perform usual arithmetic conversions, they just do integer
6141 // promotions on each operand. C99 6.5.7p3
Eli Friedmanab3a8522009-03-28 01:22:36 +00006142
John McCall1bc80af2010-12-16 19:28:59 +00006143 // For the LHS, do usual unary conversions, but then reset them away
6144 // if this is a compound assignment.
John Wiegley429bb272011-04-08 18:41:53 +00006145 ExprResult old_lex = lex;
6146 lex = UsualUnaryConversions(lex.take());
6147 if (lex.isInvalid())
6148 return QualType();
6149 QualType LHSTy = lex.get()->getType();
John McCall1bc80af2010-12-16 19:28:59 +00006150 if (isCompAssign) lex = old_lex;
6151
6152 // The RHS is simpler.
John Wiegley429bb272011-04-08 18:41:53 +00006153 rex = UsualUnaryConversions(rex.take());
6154 if (rex.isInvalid())
6155 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006156
Ryan Flynnd0439682009-08-07 16:20:20 +00006157 // Sanity-check shift operands
Chandler Carruth21206d52011-02-23 23:34:11 +00006158 DiagnoseBadShiftValues(*this, lex, rex, Loc, Opc, LHSTy);
Ryan Flynnd0439682009-08-07 16:20:20 +00006159
Chris Lattnerca5eede2007-12-12 05:47:28 +00006160 // "The type of the result is that of the promoted left operand."
Eli Friedmanab3a8522009-03-28 01:22:36 +00006161 return LHSTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00006162}
6163
Chandler Carruth99919472010-07-10 12:30:03 +00006164static bool IsWithinTemplateSpecialization(Decl *D) {
6165 if (DeclContext *DC = D->getDeclContext()) {
6166 if (isa<ClassTemplateSpecializationDecl>(DC))
6167 return true;
6168 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(DC))
6169 return FD->isFunctionTemplateSpecialization();
6170 }
6171 return false;
6172}
6173
Douglas Gregor0c6db942009-05-04 06:07:12 +00006174// C99 6.5.8, C++ [expr.rel]
Richard Trieu67e29332011-08-02 04:35:43 +00006175QualType Sema::CheckCompareOperands(ExprResult &lex, ExprResult &rex,
6176 SourceLocation Loc, unsigned OpaqueOpc,
6177 bool isRelational) {
John McCall2de56d12010-08-25 11:45:40 +00006178 BinaryOperatorKind Opc = (BinaryOperatorKind) OpaqueOpc;
Douglas Gregora86b8322009-04-06 18:45:53 +00006179
Chris Lattner02dd4b12009-12-05 05:40:13 +00006180 // Handle vector comparisons separately.
Richard Trieu67e29332011-08-02 04:35:43 +00006181 if (lex.get()->getType()->isVectorType() ||
6182 rex.get()->getType()->isVectorType())
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006183 return CheckVectorCompareOperands(lex, rex, Loc, isRelational);
Mike Stumpeed9cac2009-02-19 03:04:26 +00006184
John Wiegley429bb272011-04-08 18:41:53 +00006185 QualType lType = lex.get()->getType();
6186 QualType rType = rex.get()->getType();
Douglas Gregorfadb53b2011-03-12 01:48:56 +00006187
John Wiegley429bb272011-04-08 18:41:53 +00006188 Expr *LHSStripped = lex.get()->IgnoreParenImpCasts();
6189 Expr *RHSStripped = rex.get()->IgnoreParenImpCasts();
Chandler Carruth543cb652011-02-17 08:37:06 +00006190 QualType LHSStrippedType = LHSStripped->getType();
6191 QualType RHSStrippedType = RHSStripped->getType();
6192
Douglas Gregorfadb53b2011-03-12 01:48:56 +00006193
6194
Chandler Carruth543cb652011-02-17 08:37:06 +00006195 // Two different enums will raise a warning when compared.
6196 if (const EnumType *LHSEnumType = LHSStrippedType->getAs<EnumType>()) {
6197 if (const EnumType *RHSEnumType = RHSStrippedType->getAs<EnumType>()) {
6198 if (LHSEnumType->getDecl()->getIdentifier() &&
6199 RHSEnumType->getDecl()->getIdentifier() &&
6200 !Context.hasSameUnqualifiedType(LHSStrippedType, RHSStrippedType)) {
6201 Diag(Loc, diag::warn_comparison_of_mixed_enum_types)
6202 << LHSStrippedType << RHSStrippedType
John Wiegley429bb272011-04-08 18:41:53 +00006203 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Chandler Carruth543cb652011-02-17 08:37:06 +00006204 }
6205 }
6206 }
6207
Douglas Gregor8eee1192010-06-22 22:12:46 +00006208 if (!lType->hasFloatingRepresentation() &&
Ted Kremenekfbcb0eb2010-09-16 00:03:01 +00006209 !(lType->isBlockPointerType() && isRelational) &&
John Wiegley429bb272011-04-08 18:41:53 +00006210 !lex.get()->getLocStart().isMacroID() &&
6211 !rex.get()->getLocStart().isMacroID()) {
Chris Lattner55660a72009-03-08 19:39:53 +00006212 // For non-floating point types, check for self-comparisons of the form
6213 // x == x, x != x, x < x, etc. These always evaluate to a constant, and
6214 // often indicate logic errors in the program.
Chandler Carruth64d092c2010-07-12 06:23:38 +00006215 //
6216 // NOTE: Don't warn about comparison expressions resulting from macro
6217 // expansion. Also don't warn about comparisons which are only self
6218 // comparisons within a template specialization. The warnings should catch
6219 // obvious cases in the definition of the template anyways. The idea is to
6220 // warn when the typed comparison operator will always evaluate to the same
6221 // result.
Chandler Carruth99919472010-07-10 12:30:03 +00006222 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) {
Douglas Gregord64fdd02010-06-08 19:50:34 +00006223 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) {
Ted Kremenekfbcb0eb2010-09-16 00:03:01 +00006224 if (DRL->getDecl() == DRR->getDecl() &&
Chandler Carruth99919472010-07-10 12:30:03 +00006225 !IsWithinTemplateSpecialization(DRL->getDecl())) {
Ted Kremenek351ba912011-02-23 01:52:04 +00006226 DiagRuntimeBehavior(Loc, 0, PDiag(diag::warn_comparison_always)
Douglas Gregord64fdd02010-06-08 19:50:34 +00006227 << 0 // self-
John McCall2de56d12010-08-25 11:45:40 +00006228 << (Opc == BO_EQ
6229 || Opc == BO_LE
6230 || Opc == BO_GE));
Douglas Gregord64fdd02010-06-08 19:50:34 +00006231 } else if (lType->isArrayType() && rType->isArrayType() &&
6232 !DRL->getDecl()->getType()->isReferenceType() &&
6233 !DRR->getDecl()->getType()->isReferenceType()) {
6234 // what is it always going to eval to?
6235 char always_evals_to;
6236 switch(Opc) {
John McCall2de56d12010-08-25 11:45:40 +00006237 case BO_EQ: // e.g. array1 == array2
Douglas Gregord64fdd02010-06-08 19:50:34 +00006238 always_evals_to = 0; // false
6239 break;
John McCall2de56d12010-08-25 11:45:40 +00006240 case BO_NE: // e.g. array1 != array2
Douglas Gregord64fdd02010-06-08 19:50:34 +00006241 always_evals_to = 1; // true
6242 break;
6243 default:
6244 // best we can say is 'a constant'
6245 always_evals_to = 2; // e.g. array1 <= array2
6246 break;
6247 }
Ted Kremenek351ba912011-02-23 01:52:04 +00006248 DiagRuntimeBehavior(Loc, 0, PDiag(diag::warn_comparison_always)
Douglas Gregord64fdd02010-06-08 19:50:34 +00006249 << 1 // array
6250 << always_evals_to);
6251 }
6252 }
Chandler Carruth99919472010-07-10 12:30:03 +00006253 }
Mike Stump1eb44332009-09-09 15:08:12 +00006254
Chris Lattner55660a72009-03-08 19:39:53 +00006255 if (isa<CastExpr>(LHSStripped))
6256 LHSStripped = LHSStripped->IgnoreParenCasts();
6257 if (isa<CastExpr>(RHSStripped))
6258 RHSStripped = RHSStripped->IgnoreParenCasts();
Mike Stump1eb44332009-09-09 15:08:12 +00006259
Chris Lattner55660a72009-03-08 19:39:53 +00006260 // Warn about comparisons against a string constant (unless the other
6261 // operand is null), the user probably wants strcmp.
Douglas Gregora86b8322009-04-06 18:45:53 +00006262 Expr *literalString = 0;
6263 Expr *literalStringStripped = 0;
Chris Lattner55660a72009-03-08 19:39:53 +00006264 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) &&
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006265 !RHSStripped->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00006266 Expr::NPC_ValueDependentIsNull)) {
John Wiegley429bb272011-04-08 18:41:53 +00006267 literalString = lex.get();
Douglas Gregora86b8322009-04-06 18:45:53 +00006268 literalStringStripped = LHSStripped;
Mike Stumpac5fc7c2009-08-04 21:02:39 +00006269 } else if ((isa<StringLiteral>(RHSStripped) ||
6270 isa<ObjCEncodeExpr>(RHSStripped)) &&
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006271 !LHSStripped->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00006272 Expr::NPC_ValueDependentIsNull)) {
John Wiegley429bb272011-04-08 18:41:53 +00006273 literalString = rex.get();
Douglas Gregora86b8322009-04-06 18:45:53 +00006274 literalStringStripped = RHSStripped;
6275 }
6276
6277 if (literalString) {
6278 std::string resultComparison;
6279 switch (Opc) {
John McCall2de56d12010-08-25 11:45:40 +00006280 case BO_LT: resultComparison = ") < 0"; break;
6281 case BO_GT: resultComparison = ") > 0"; break;
6282 case BO_LE: resultComparison = ") <= 0"; break;
6283 case BO_GE: resultComparison = ") >= 0"; break;
6284 case BO_EQ: resultComparison = ") == 0"; break;
6285 case BO_NE: resultComparison = ") != 0"; break;
Douglas Gregora86b8322009-04-06 18:45:53 +00006286 default: assert(false && "Invalid comparison operator");
6287 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006288
Ted Kremenek351ba912011-02-23 01:52:04 +00006289 DiagRuntimeBehavior(Loc, 0,
Douglas Gregord1e4d9b2010-01-12 23:18:54 +00006290 PDiag(diag::warn_stringcompare)
6291 << isa<ObjCEncodeExpr>(literalStringStripped)
Ted Kremenek03a4bee2010-04-09 20:26:53 +00006292 << literalString->getSourceRange());
Douglas Gregora86b8322009-04-06 18:45:53 +00006293 }
Ted Kremenek3ca0bf22007-10-29 16:58:49 +00006294 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006295
Douglas Gregord64fdd02010-06-08 19:50:34 +00006296 // C99 6.5.8p3 / C99 6.5.9p4
Richard Trieu67e29332011-08-02 04:35:43 +00006297 if (lex.get()->getType()->isArithmeticType() &&
6298 rex.get()->getType()->isArithmeticType()) {
Douglas Gregord64fdd02010-06-08 19:50:34 +00006299 UsualArithmeticConversions(lex, rex);
John Wiegley429bb272011-04-08 18:41:53 +00006300 if (lex.isInvalid() || rex.isInvalid())
6301 return QualType();
6302 }
Douglas Gregord64fdd02010-06-08 19:50:34 +00006303 else {
John Wiegley429bb272011-04-08 18:41:53 +00006304 lex = UsualUnaryConversions(lex.take());
6305 if (lex.isInvalid())
6306 return QualType();
6307
6308 rex = UsualUnaryConversions(rex.take());
6309 if (rex.isInvalid())
6310 return QualType();
Douglas Gregord64fdd02010-06-08 19:50:34 +00006311 }
6312
John Wiegley429bb272011-04-08 18:41:53 +00006313 lType = lex.get()->getType();
6314 rType = rex.get()->getType();
Douglas Gregord64fdd02010-06-08 19:50:34 +00006315
Douglas Gregor447b69e2008-11-19 03:25:36 +00006316 // The result of comparisons is 'bool' in C++, 'int' in C.
Argyrios Kyrtzidis16f744b2011-02-18 20:55:15 +00006317 QualType ResultTy = Context.getLogicalOperationType();
Douglas Gregor447b69e2008-11-19 03:25:36 +00006318
Chris Lattnera5937dd2007-08-26 01:18:55 +00006319 if (isRelational) {
6320 if (lType->isRealType() && rType->isRealType())
Douglas Gregor447b69e2008-11-19 03:25:36 +00006321 return ResultTy;
Chris Lattnera5937dd2007-08-26 01:18:55 +00006322 } else {
Ted Kremenek72cb1ae2007-10-29 17:13:39 +00006323 // Check for comparisons of floating point operands using != and ==.
Douglas Gregor8eee1192010-06-22 22:12:46 +00006324 if (lType->hasFloatingRepresentation())
John Wiegley429bb272011-04-08 18:41:53 +00006325 CheckFloatComparison(Loc, lex.get(), rex.get());
Mike Stumpeed9cac2009-02-19 03:04:26 +00006326
Chris Lattnera5937dd2007-08-26 01:18:55 +00006327 if (lType->isArithmeticType() && rType->isArithmeticType())
Douglas Gregor447b69e2008-11-19 03:25:36 +00006328 return ResultTy;
Chris Lattnera5937dd2007-08-26 01:18:55 +00006329 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006330
John Wiegley429bb272011-04-08 18:41:53 +00006331 bool LHSIsNull = lex.get()->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00006332 Expr::NPC_ValueDependentIsNull);
John Wiegley429bb272011-04-08 18:41:53 +00006333 bool RHSIsNull = rex.get()->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00006334 Expr::NPC_ValueDependentIsNull);
Mike Stumpeed9cac2009-02-19 03:04:26 +00006335
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006336 // All of the following pointer-related warnings are GCC extensions, except
6337 // when handling null pointer constants.
Steve Naroff77878cc2007-08-27 04:08:11 +00006338 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2
Chris Lattnerbc896f52008-04-03 05:07:25 +00006339 QualType LCanPointeeTy =
Ted Kremenek6217b802009-07-29 21:53:49 +00006340 Context.getCanonicalType(lType->getAs<PointerType>()->getPointeeType());
Chris Lattnerbc896f52008-04-03 05:07:25 +00006341 QualType RCanPointeeTy =
Ted Kremenek6217b802009-07-29 21:53:49 +00006342 Context.getCanonicalType(rType->getAs<PointerType>()->getPointeeType());
Mike Stumpeed9cac2009-02-19 03:04:26 +00006343
Douglas Gregor0c6db942009-05-04 06:07:12 +00006344 if (getLangOptions().CPlusPlus) {
Eli Friedman3075e762009-08-23 00:27:47 +00006345 if (LCanPointeeTy == RCanPointeeTy)
6346 return ResultTy;
Fariborz Jahanian51874dd2009-12-21 18:19:17 +00006347 if (!isRelational &&
6348 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) {
6349 // Valid unless comparison between non-null pointer and function pointer
6350 // This is a gcc extension compatibility comparison.
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006351 // In a SFINAE context, we treat this as a hard error to maintain
6352 // conformance with the C++ standard.
Fariborz Jahanian51874dd2009-12-21 18:19:17 +00006353 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType())
6354 && !LHSIsNull && !RHSIsNull) {
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006355 Diag(Loc,
6356 isSFINAEContext()?
6357 diag::err_typecheck_comparison_of_fptr_to_void
6358 : diag::ext_typecheck_comparison_of_fptr_to_void)
Richard Trieu67e29332011-08-02 04:35:43 +00006359 << lType << rType << lex.get()->getSourceRange()
6360 << rex.get()->getSourceRange();
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006361
6362 if (isSFINAEContext())
6363 return QualType();
6364
John Wiegley429bb272011-04-08 18:41:53 +00006365 rex = ImpCastExprToType(rex.take(), lType, CK_BitCast);
Fariborz Jahanian51874dd2009-12-21 18:19:17 +00006366 return ResultTy;
6367 }
6368 }
Anders Carlsson0c8209e2010-11-04 03:17:43 +00006369
Douglas Gregor0c6db942009-05-04 06:07:12 +00006370 // C++ [expr.rel]p2:
6371 // [...] Pointer conversions (4.10) and qualification
6372 // conversions (4.4) are performed on pointer operands (or on
6373 // a pointer operand and a null pointer constant) to bring
6374 // them to their composite pointer type. [...]
6375 //
Douglas Gregor20b3e992009-08-24 17:42:35 +00006376 // C++ [expr.eq]p1 uses the same notion for (in)equality
Douglas Gregor0c6db942009-05-04 06:07:12 +00006377 // comparisons of pointers.
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00006378 bool NonStandardCompositeType = false;
Douglas Gregor8f00dcf2010-04-16 23:20:25 +00006379 QualType T = FindCompositePointerType(Loc, lex, rex,
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00006380 isSFINAEContext()? 0 : &NonStandardCompositeType);
Douglas Gregor0c6db942009-05-04 06:07:12 +00006381 if (T.isNull()) {
6382 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers)
Richard Trieu67e29332011-08-02 04:35:43 +00006383 << lType << rType << lex.get()->getSourceRange()
6384 << rex.get()->getSourceRange();
Douglas Gregor0c6db942009-05-04 06:07:12 +00006385 return QualType();
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00006386 } else if (NonStandardCompositeType) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006387 Diag(Loc,
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00006388 diag::ext_typecheck_comparison_of_distinct_pointers_nonstandard)
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006389 << lType << rType << T
John Wiegley429bb272011-04-08 18:41:53 +00006390 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregor0c6db942009-05-04 06:07:12 +00006391 }
6392
John Wiegley429bb272011-04-08 18:41:53 +00006393 lex = ImpCastExprToType(lex.take(), T, CK_BitCast);
6394 rex = ImpCastExprToType(rex.take(), T, CK_BitCast);
Douglas Gregor0c6db942009-05-04 06:07:12 +00006395 return ResultTy;
6396 }
Eli Friedman3075e762009-08-23 00:27:47 +00006397 // C99 6.5.9p2 and C99 6.5.8p2
6398 if (Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(),
6399 RCanPointeeTy.getUnqualifiedType())) {
6400 // Valid unless a relational comparison of function pointers
6401 if (isRelational && LCanPointeeTy->isFunctionType()) {
6402 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers)
Richard Trieu67e29332011-08-02 04:35:43 +00006403 << lType << rType << lex.get()->getSourceRange()
6404 << rex.get()->getSourceRange();
Eli Friedman3075e762009-08-23 00:27:47 +00006405 }
6406 } else if (!isRelational &&
6407 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) {
6408 // Valid unless comparison between non-null pointer and function pointer
6409 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType())
6410 && !LHSIsNull && !RHSIsNull) {
6411 Diag(Loc, diag::ext_typecheck_comparison_of_fptr_to_void)
Richard Trieu67e29332011-08-02 04:35:43 +00006412 << lType << rType << lex.get()->getSourceRange()
6413 << rex.get()->getSourceRange();
Eli Friedman3075e762009-08-23 00:27:47 +00006414 }
6415 } else {
6416 // Invalid
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00006417 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers)
Richard Trieu67e29332011-08-02 04:35:43 +00006418 << lType << rType << lex.get()->getSourceRange()
6419 << rex.get()->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00006420 }
John McCall34d6f932011-03-11 04:25:25 +00006421 if (LCanPointeeTy != RCanPointeeTy) {
6422 if (LHSIsNull && !RHSIsNull)
John Wiegley429bb272011-04-08 18:41:53 +00006423 lex = ImpCastExprToType(lex.take(), rType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00006424 else
John Wiegley429bb272011-04-08 18:41:53 +00006425 rex = ImpCastExprToType(rex.take(), lType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00006426 }
Douglas Gregor447b69e2008-11-19 03:25:36 +00006427 return ResultTy;
Steve Naroffe77fd3c2007-08-16 21:48:38 +00006428 }
Mike Stump1eb44332009-09-09 15:08:12 +00006429
Sebastian Redl6e8ed162009-05-10 18:38:11 +00006430 if (getLangOptions().CPlusPlus) {
Anders Carlsson0c8209e2010-11-04 03:17:43 +00006431 // Comparison of nullptr_t with itself.
6432 if (lType->isNullPtrType() && rType->isNullPtrType())
6433 return ResultTy;
6434
Mike Stump1eb44332009-09-09 15:08:12 +00006435 // Comparison of pointers with null pointer constants and equality
Douglas Gregor20b3e992009-08-24 17:42:35 +00006436 // comparisons of member pointers to null pointer constants.
Mike Stump1eb44332009-09-09 15:08:12 +00006437 if (RHSIsNull &&
Douglas Gregor17e37c72011-06-01 15:12:24 +00006438 ((lType->isAnyPointerType() || lType->isNullPtrType()) ||
Douglas Gregor16cd4b72011-06-16 18:52:05 +00006439 (!isRelational &&
6440 (lType->isMemberPointerType() || lType->isBlockPointerType())))) {
John Wiegley429bb272011-04-08 18:41:53 +00006441 rex = ImpCastExprToType(rex.take(), lType,
Douglas Gregor443c2122010-08-07 13:36:37 +00006442 lType->isMemberPointerType()
John McCall2de56d12010-08-25 11:45:40 +00006443 ? CK_NullToMemberPointer
John McCall404cd162010-11-13 01:35:44 +00006444 : CK_NullToPointer);
Sebastian Redl6e8ed162009-05-10 18:38:11 +00006445 return ResultTy;
6446 }
Douglas Gregor20b3e992009-08-24 17:42:35 +00006447 if (LHSIsNull &&
Douglas Gregor17e37c72011-06-01 15:12:24 +00006448 ((rType->isAnyPointerType() || rType->isNullPtrType()) ||
Douglas Gregor16cd4b72011-06-16 18:52:05 +00006449 (!isRelational &&
6450 (rType->isMemberPointerType() || rType->isBlockPointerType())))) {
John Wiegley429bb272011-04-08 18:41:53 +00006451 lex = ImpCastExprToType(lex.take(), rType,
Douglas Gregor443c2122010-08-07 13:36:37 +00006452 rType->isMemberPointerType()
John McCall2de56d12010-08-25 11:45:40 +00006453 ? CK_NullToMemberPointer
John McCall404cd162010-11-13 01:35:44 +00006454 : CK_NullToPointer);
Sebastian Redl6e8ed162009-05-10 18:38:11 +00006455 return ResultTy;
6456 }
Douglas Gregor20b3e992009-08-24 17:42:35 +00006457
6458 // Comparison of member pointers.
Mike Stump1eb44332009-09-09 15:08:12 +00006459 if (!isRelational &&
Douglas Gregor20b3e992009-08-24 17:42:35 +00006460 lType->isMemberPointerType() && rType->isMemberPointerType()) {
6461 // C++ [expr.eq]p2:
Mike Stump1eb44332009-09-09 15:08:12 +00006462 // In addition, pointers to members can be compared, or a pointer to
6463 // member and a null pointer constant. Pointer to member conversions
6464 // (4.11) and qualification conversions (4.4) are performed to bring
6465 // them to a common type. If one operand is a null pointer constant,
6466 // the common type is the type of the other operand. Otherwise, the
6467 // common type is a pointer to member type similar (4.4) to the type
6468 // of one of the operands, with a cv-qualification signature (4.4)
6469 // that is the union of the cv-qualification signatures of the operand
Douglas Gregor20b3e992009-08-24 17:42:35 +00006470 // types.
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00006471 bool NonStandardCompositeType = false;
Douglas Gregor8f00dcf2010-04-16 23:20:25 +00006472 QualType T = FindCompositePointerType(Loc, lex, rex,
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00006473 isSFINAEContext()? 0 : &NonStandardCompositeType);
Douglas Gregor20b3e992009-08-24 17:42:35 +00006474 if (T.isNull()) {
6475 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers)
Richard Trieu67e29332011-08-02 04:35:43 +00006476 << lType << rType << lex.get()->getSourceRange()
6477 << rex.get()->getSourceRange();
Douglas Gregor20b3e992009-08-24 17:42:35 +00006478 return QualType();
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00006479 } else if (NonStandardCompositeType) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006480 Diag(Loc,
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00006481 diag::ext_typecheck_comparison_of_distinct_pointers_nonstandard)
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006482 << lType << rType << T
John Wiegley429bb272011-04-08 18:41:53 +00006483 << lex.get()->getSourceRange() << rex.get()->getSourceRange();
Douglas Gregor20b3e992009-08-24 17:42:35 +00006484 }
Mike Stump1eb44332009-09-09 15:08:12 +00006485
John Wiegley429bb272011-04-08 18:41:53 +00006486 lex = ImpCastExprToType(lex.take(), T, CK_BitCast);
6487 rex = ImpCastExprToType(rex.take(), T, CK_BitCast);
Douglas Gregor20b3e992009-08-24 17:42:35 +00006488 return ResultTy;
6489 }
Douglas Gregor90566c02011-03-01 17:16:20 +00006490
6491 // Handle scoped enumeration types specifically, since they don't promote
6492 // to integers.
John Wiegley429bb272011-04-08 18:41:53 +00006493 if (lex.get()->getType()->isEnumeralType() &&
Richard Trieu67e29332011-08-02 04:35:43 +00006494 Context.hasSameUnqualifiedType(lex.get()->getType(),
6495 rex.get()->getType()))
Douglas Gregor90566c02011-03-01 17:16:20 +00006496 return ResultTy;
Sebastian Redl6e8ed162009-05-10 18:38:11 +00006497 }
Mike Stump1eb44332009-09-09 15:08:12 +00006498
Steve Naroff1c7d0672008-09-04 15:10:53 +00006499 // Handle block pointer types.
Richard Trieu67e29332011-08-02 04:35:43 +00006500 if (!isRelational && lType->isBlockPointerType() &&
6501 rType->isBlockPointerType()) {
Ted Kremenek6217b802009-07-29 21:53:49 +00006502 QualType lpointee = lType->getAs<BlockPointerType>()->getPointeeType();
6503 QualType rpointee = rType->getAs<BlockPointerType>()->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006504
Steve Naroff1c7d0672008-09-04 15:10:53 +00006505 if (!LHSIsNull && !RHSIsNull &&
Eli Friedman26784c12009-06-08 05:08:54 +00006506 !Context.typesAreCompatible(lpointee, rpointee)) {
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00006507 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
Richard Trieu67e29332011-08-02 04:35:43 +00006508 << lType << rType << lex.get()->getSourceRange()
6509 << rex.get()->getSourceRange();
Steve Naroff1c7d0672008-09-04 15:10:53 +00006510 }
John Wiegley429bb272011-04-08 18:41:53 +00006511 rex = ImpCastExprToType(rex.take(), lType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006512 return ResultTy;
Steve Naroff1c7d0672008-09-04 15:10:53 +00006513 }
John Wiegley429bb272011-04-08 18:41:53 +00006514
Steve Naroff59f53942008-09-28 01:11:11 +00006515 // Allow block pointers to be compared with null pointer constants.
Mike Stumpdd3e1662009-05-07 03:14:14 +00006516 if (!isRelational
6517 && ((lType->isBlockPointerType() && rType->isPointerType())
6518 || (lType->isPointerType() && rType->isBlockPointerType()))) {
Steve Naroff59f53942008-09-28 01:11:11 +00006519 if (!LHSIsNull && !RHSIsNull) {
John McCall34d6f932011-03-11 04:25:25 +00006520 if (!((rType->isPointerType() && rType->castAs<PointerType>()
Mike Stumpdd3e1662009-05-07 03:14:14 +00006521 ->getPointeeType()->isVoidType())
John McCall34d6f932011-03-11 04:25:25 +00006522 || (lType->isPointerType() && lType->castAs<PointerType>()
Mike Stumpdd3e1662009-05-07 03:14:14 +00006523 ->getPointeeType()->isVoidType())))
6524 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
Richard Trieu67e29332011-08-02 04:35:43 +00006525 << lType << rType << lex.get()->getSourceRange()
6526 << rex.get()->getSourceRange();
Steve Naroff59f53942008-09-28 01:11:11 +00006527 }
John McCall34d6f932011-03-11 04:25:25 +00006528 if (LHSIsNull && !RHSIsNull)
John Wiegley429bb272011-04-08 18:41:53 +00006529 lex = ImpCastExprToType(lex.take(), rType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00006530 else
John Wiegley429bb272011-04-08 18:41:53 +00006531 rex = ImpCastExprToType(rex.take(), lType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006532 return ResultTy;
Steve Naroff59f53942008-09-28 01:11:11 +00006533 }
Steve Naroff1c7d0672008-09-04 15:10:53 +00006534
John McCall34d6f932011-03-11 04:25:25 +00006535 if (lType->isObjCObjectPointerType() || rType->isObjCObjectPointerType()) {
6536 const PointerType *LPT = lType->getAs<PointerType>();
6537 const PointerType *RPT = rType->getAs<PointerType>();
6538 if (LPT || RPT) {
6539 bool LPtrToVoid = LPT ? LPT->getPointeeType()->isVoidType() : false;
6540 bool RPtrToVoid = RPT ? RPT->getPointeeType()->isVoidType() : false;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006541
Steve Naroffa8069f12008-11-17 19:49:16 +00006542 if (!LPtrToVoid && !RPtrToVoid &&
6543 !Context.typesAreCompatible(lType, rType)) {
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00006544 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers)
Richard Trieu67e29332011-08-02 04:35:43 +00006545 << lType << rType << lex.get()->getSourceRange()
6546 << rex.get()->getSourceRange();
Steve Naroffa5ad8632008-10-27 10:33:19 +00006547 }
John McCall34d6f932011-03-11 04:25:25 +00006548 if (LHSIsNull && !RHSIsNull)
John Wiegley429bb272011-04-08 18:41:53 +00006549 lex = ImpCastExprToType(lex.take(), rType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00006550 else
John Wiegley429bb272011-04-08 18:41:53 +00006551 rex = ImpCastExprToType(rex.take(), lType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006552 return ResultTy;
Steve Naroff87f3b932008-10-20 18:19:10 +00006553 }
Steve Naroff14108da2009-07-10 23:34:53 +00006554 if (lType->isObjCObjectPointerType() && rType->isObjCObjectPointerType()) {
Chris Lattner6365e3e2009-08-22 18:58:31 +00006555 if (!Context.areComparableObjCPointerTypes(lType, rType))
Steve Naroff14108da2009-07-10 23:34:53 +00006556 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers)
Richard Trieu67e29332011-08-02 04:35:43 +00006557 << lType << rType << lex.get()->getSourceRange()
6558 << rex.get()->getSourceRange();
John McCall34d6f932011-03-11 04:25:25 +00006559 if (LHSIsNull && !RHSIsNull)
John Wiegley429bb272011-04-08 18:41:53 +00006560 lex = ImpCastExprToType(lex.take(), rType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00006561 else
John Wiegley429bb272011-04-08 18:41:53 +00006562 rex = ImpCastExprToType(rex.take(), lType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006563 return ResultTy;
Steve Naroff20373222008-06-03 14:04:54 +00006564 }
Fariborz Jahanian7359f042007-12-20 01:06:58 +00006565 }
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006566 if ((lType->isAnyPointerType() && rType->isIntegerType()) ||
6567 (lType->isIntegerType() && rType->isAnyPointerType())) {
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006568 unsigned DiagID = 0;
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006569 bool isError = false;
6570 if ((LHSIsNull && lType->isIntegerType()) ||
6571 (RHSIsNull && rType->isIntegerType())) {
6572 if (isRelational && !getLangOptions().CPlusPlus)
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006573 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero;
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006574 } else if (isRelational && !getLangOptions().CPlusPlus)
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006575 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer;
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006576 else if (getLangOptions().CPlusPlus) {
6577 DiagID = diag::err_typecheck_comparison_of_pointer_integer;
6578 isError = true;
6579 } else
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006580 DiagID = diag::ext_typecheck_comparison_of_pointer_integer;
Mike Stump1eb44332009-09-09 15:08:12 +00006581
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006582 if (DiagID) {
Chris Lattner6365e3e2009-08-22 18:58:31 +00006583 Diag(Loc, DiagID)
Richard Trieu67e29332011-08-02 04:35:43 +00006584 << lType << rType << lex.get()->getSourceRange()
6585 << rex.get()->getSourceRange();
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006586 if (isError)
6587 return QualType();
Chris Lattner6365e3e2009-08-22 18:58:31 +00006588 }
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006589
6590 if (lType->isIntegerType())
John Wiegley429bb272011-04-08 18:41:53 +00006591 lex = ImpCastExprToType(lex.take(), rType,
John McCall404cd162010-11-13 01:35:44 +00006592 LHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006593 else
John Wiegley429bb272011-04-08 18:41:53 +00006594 rex = ImpCastExprToType(rex.take(), lType,
John McCall404cd162010-11-13 01:35:44 +00006595 RHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006596 return ResultTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00006597 }
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006598
Steve Naroff39218df2008-09-04 16:56:14 +00006599 // Handle block pointers.
Mike Stumpaf199f32009-05-07 18:43:07 +00006600 if (!isRelational && RHSIsNull
6601 && lType->isBlockPointerType() && rType->isIntegerType()) {
John Wiegley429bb272011-04-08 18:41:53 +00006602 rex = ImpCastExprToType(rex.take(), lType, CK_NullToPointer);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006603 return ResultTy;
Steve Naroff39218df2008-09-04 16:56:14 +00006604 }
Mike Stumpaf199f32009-05-07 18:43:07 +00006605 if (!isRelational && LHSIsNull
6606 && lType->isIntegerType() && rType->isBlockPointerType()) {
John Wiegley429bb272011-04-08 18:41:53 +00006607 lex = ImpCastExprToType(lex.take(), rType, CK_NullToPointer);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006608 return ResultTy;
Steve Naroff39218df2008-09-04 16:56:14 +00006609 }
Douglas Gregor90566c02011-03-01 17:16:20 +00006610
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006611 return InvalidOperands(Loc, lex, rex);
Reid Spencer5f016e22007-07-11 17:01:13 +00006612}
6613
Nate Begemanbe2341d2008-07-14 18:02:46 +00006614/// CheckVectorCompareOperands - vector comparisons are a clang extension that
Mike Stumpeed9cac2009-02-19 03:04:26 +00006615/// operates on extended vector types. Instead of producing an IntTy result,
Nate Begemanbe2341d2008-07-14 18:02:46 +00006616/// like a scalar comparison, a vector comparison produces a vector of integer
6617/// types.
John Wiegley429bb272011-04-08 18:41:53 +00006618QualType Sema::CheckVectorCompareOperands(ExprResult &lex, ExprResult &rex,
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006619 SourceLocation Loc,
Nate Begemanbe2341d2008-07-14 18:02:46 +00006620 bool isRelational) {
6621 // Check to make sure we're operating on vectors of the same type and width,
6622 // Allowing one side to be a scalar of element type.
Eli Friedmanb9b4b782011-06-23 18:10:35 +00006623 QualType vType = CheckVectorOperands(lex, rex, Loc, /*isCompAssign*/false);
Nate Begemanbe2341d2008-07-14 18:02:46 +00006624 if (vType.isNull())
6625 return vType;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006626
John Wiegley429bb272011-04-08 18:41:53 +00006627 QualType lType = lex.get()->getType();
6628 QualType rType = rex.get()->getType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006629
Anton Yartsev7870b132011-03-27 15:36:07 +00006630 // If AltiVec, the comparison results in a numeric type, i.e.
6631 // bool for C++, int for C
Anton Yartsev6305f722011-03-28 21:00:05 +00006632 if (vType->getAs<VectorType>()->getVectorKind() == VectorType::AltiVecVector)
Anton Yartsev7870b132011-03-27 15:36:07 +00006633 return Context.getLogicalOperationType();
6634
Nate Begemanbe2341d2008-07-14 18:02:46 +00006635 // For non-floating point types, check for self-comparisons of the form
6636 // x == x, x != x, x < x, etc. These always evaluate to a constant, and
6637 // often indicate logic errors in the program.
Douglas Gregor8eee1192010-06-22 22:12:46 +00006638 if (!lType->hasFloatingRepresentation()) {
John Wiegley429bb272011-04-08 18:41:53 +00006639 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex.get()->IgnoreParens()))
6640 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex.get()->IgnoreParens()))
Nate Begemanbe2341d2008-07-14 18:02:46 +00006641 if (DRL->getDecl() == DRR->getDecl())
Ted Kremenek351ba912011-02-23 01:52:04 +00006642 DiagRuntimeBehavior(Loc, 0,
Douglas Gregord64fdd02010-06-08 19:50:34 +00006643 PDiag(diag::warn_comparison_always)
6644 << 0 // self-
6645 << 2 // "a constant"
6646 );
Nate Begemanbe2341d2008-07-14 18:02:46 +00006647 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006648
Nate Begemanbe2341d2008-07-14 18:02:46 +00006649 // Check for comparisons of floating point operands using != and ==.
Douglas Gregor8eee1192010-06-22 22:12:46 +00006650 if (!isRelational && lType->hasFloatingRepresentation()) {
6651 assert (rType->hasFloatingRepresentation());
John Wiegley429bb272011-04-08 18:41:53 +00006652 CheckFloatComparison(Loc, lex.get(), rex.get());
Nate Begemanbe2341d2008-07-14 18:02:46 +00006653 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006654
Nate Begemanbe2341d2008-07-14 18:02:46 +00006655 // Return the type for the comparison, which is the same as vector type for
6656 // integer vectors, or an integer type of identical size and number of
6657 // elements for floating point vectors.
Douglas Gregorf6094622010-07-23 15:58:24 +00006658 if (lType->hasIntegerRepresentation())
Nate Begemanbe2341d2008-07-14 18:02:46 +00006659 return lType;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006660
John McCall183700f2009-09-21 23:43:11 +00006661 const VectorType *VTy = lType->getAs<VectorType>();
Nate Begemanbe2341d2008-07-14 18:02:46 +00006662 unsigned TypeSize = Context.getTypeSize(VTy->getElementType());
Nate Begeman59b5da62009-01-18 03:20:47 +00006663 if (TypeSize == Context.getTypeSize(Context.IntTy))
Nate Begemanbe2341d2008-07-14 18:02:46 +00006664 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements());
Chris Lattnerd013aa12009-03-31 07:46:52 +00006665 if (TypeSize == Context.getTypeSize(Context.LongTy))
Nate Begeman59b5da62009-01-18 03:20:47 +00006666 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements());
6667
Mike Stumpeed9cac2009-02-19 03:04:26 +00006668 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) &&
Nate Begeman59b5da62009-01-18 03:20:47 +00006669 "Unhandled vector element size in vector compare");
Nate Begemanbe2341d2008-07-14 18:02:46 +00006670 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements());
6671}
6672
Reid Spencer5f016e22007-07-11 17:01:13 +00006673inline QualType Sema::CheckBitwiseOperands(
John Wiegley429bb272011-04-08 18:41:53 +00006674 ExprResult &lex, ExprResult &rex, SourceLocation Loc, bool isCompAssign) {
Richard Trieu67e29332011-08-02 04:35:43 +00006675 if (lex.get()->getType()->isVectorType() ||
6676 rex.get()->getType()->isVectorType()) {
John Wiegley429bb272011-04-08 18:41:53 +00006677 if (lex.get()->getType()->hasIntegerRepresentation() &&
6678 rex.get()->getType()->hasIntegerRepresentation())
Eli Friedmanb9b4b782011-06-23 18:10:35 +00006679 return CheckVectorOperands(lex, rex, Loc, isCompAssign);
Douglas Gregorf6094622010-07-23 15:58:24 +00006680
6681 return InvalidOperands(Loc, lex, rex);
6682 }
Steve Naroff90045e82007-07-13 23:32:42 +00006683
John Wiegley429bb272011-04-08 18:41:53 +00006684 ExprResult lexResult = Owned(lex), rexResult = Owned(rex);
Richard Trieu67e29332011-08-02 04:35:43 +00006685 QualType compType = UsualArithmeticConversions(lexResult, rexResult,
6686 isCompAssign);
John Wiegley429bb272011-04-08 18:41:53 +00006687 if (lexResult.isInvalid() || rexResult.isInvalid())
6688 return QualType();
6689 lex = lexResult.take();
6690 rex = rexResult.take();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006691
John Wiegley429bb272011-04-08 18:41:53 +00006692 if (lex.get()->getType()->isIntegralOrUnscopedEnumerationType() &&
6693 rex.get()->getType()->isIntegralOrUnscopedEnumerationType())
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00006694 return compType;
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006695 return InvalidOperands(Loc, lex, rex);
Reid Spencer5f016e22007-07-11 17:01:13 +00006696}
6697
6698inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14]
John Wiegley429bb272011-04-08 18:41:53 +00006699 ExprResult &lex, ExprResult &rex, SourceLocation Loc, unsigned Opc) {
Chris Lattner90a8f272010-07-13 19:41:32 +00006700
6701 // Diagnose cases where the user write a logical and/or but probably meant a
6702 // bitwise one. We do this when the LHS is a non-bool integer and the RHS
6703 // is a constant.
Richard Trieu67e29332011-08-02 04:35:43 +00006704 if (lex.get()->getType()->isIntegerType() &&
6705 !lex.get()->getType()->isBooleanType() &&
John Wiegley429bb272011-04-08 18:41:53 +00006706 rex.get()->getType()->isIntegerType() && !rex.get()->isValueDependent() &&
Richard Trieue5adf592011-07-15 00:00:51 +00006707 // Don't warn in macros or template instantiations.
6708 !Loc.isMacroID() && ActiveTemplateInstantiations.empty()) {
Chris Lattnerb7690b42010-07-24 01:10:11 +00006709 // If the RHS can be constant folded, and if it constant folds to something
6710 // that isn't 0 or 1 (which indicate a potential logical operation that
6711 // happened to fold to true/false) then warn.
Chandler Carruth0683a142011-05-31 05:41:42 +00006712 // Parens on the RHS are ignored.
Chris Lattnerb7690b42010-07-24 01:10:11 +00006713 Expr::EvalResult Result;
Chandler Carruth0683a142011-05-31 05:41:42 +00006714 if (rex.get()->Evaluate(Result, Context) && !Result.HasSideEffects)
6715 if ((getLangOptions().Bool && !rex.get()->getType()->isBooleanType()) ||
6716 (Result.Val.getInt() != 0 && Result.Val.getInt() != 1)) {
6717 Diag(Loc, diag::warn_logical_instead_of_bitwise)
6718 << rex.get()->getSourceRange()
6719 << (Opc == BO_LAnd ? "&&" : "||")
6720 << (Opc == BO_LAnd ? "&" : "|");
Chris Lattnerb7690b42010-07-24 01:10:11 +00006721 }
6722 }
Chris Lattner90a8f272010-07-13 19:41:32 +00006723
Anders Carlssona4c98cd2009-11-23 21:47:44 +00006724 if (!Context.getLangOptions().CPlusPlus) {
John Wiegley429bb272011-04-08 18:41:53 +00006725 lex = UsualUnaryConversions(lex.take());
6726 if (lex.isInvalid())
6727 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006728
John Wiegley429bb272011-04-08 18:41:53 +00006729 rex = UsualUnaryConversions(rex.take());
6730 if (rex.isInvalid())
6731 return QualType();
6732
Richard Trieu67e29332011-08-02 04:35:43 +00006733 if (!lex.get()->getType()->isScalarType() ||
6734 !rex.get()->getType()->isScalarType())
Anders Carlssona4c98cd2009-11-23 21:47:44 +00006735 return InvalidOperands(Loc, lex, rex);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006736
Anders Carlssona4c98cd2009-11-23 21:47:44 +00006737 return Context.IntTy;
Anders Carlsson04905012009-10-16 01:44:21 +00006738 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006739
John McCall75f7c0f2010-06-04 00:29:51 +00006740 // The following is safe because we only use this method for
6741 // non-overloadable operands.
6742
Anders Carlssona4c98cd2009-11-23 21:47:44 +00006743 // C++ [expr.log.and]p1
6744 // C++ [expr.log.or]p1
John McCall75f7c0f2010-06-04 00:29:51 +00006745 // The operands are both contextually converted to type bool.
John Wiegley429bb272011-04-08 18:41:53 +00006746 ExprResult lexRes = PerformContextuallyConvertToBool(lex.get());
6747 if (lexRes.isInvalid())
Anders Carlssona4c98cd2009-11-23 21:47:44 +00006748 return InvalidOperands(Loc, lex, rex);
John Wiegley429bb272011-04-08 18:41:53 +00006749 lex = move(lexRes);
6750
6751 ExprResult rexRes = PerformContextuallyConvertToBool(rex.get());
6752 if (rexRes.isInvalid())
6753 return InvalidOperands(Loc, lex, rex);
6754 rex = move(rexRes);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006755
Anders Carlssona4c98cd2009-11-23 21:47:44 +00006756 // C++ [expr.log.and]p2
6757 // C++ [expr.log.or]p2
6758 // The result is a bool.
6759 return Context.BoolTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00006760}
6761
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00006762/// IsReadonlyProperty - Verify that otherwise a valid l-value expression
6763/// is a read-only property; return true if so. A readonly property expression
6764/// depends on various declarations and thus must be treated specially.
6765///
Mike Stump1eb44332009-09-09 15:08:12 +00006766static bool IsReadonlyProperty(Expr *E, Sema &S) {
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00006767 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) {
6768 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E);
John McCall12f78a62010-12-02 01:19:52 +00006769 if (PropExpr->isImplicitProperty()) return false;
6770
6771 ObjCPropertyDecl *PDecl = PropExpr->getExplicitProperty();
6772 QualType BaseType = PropExpr->isSuperReceiver() ?
6773 PropExpr->getSuperReceiverType() :
Fariborz Jahanian8ac2d442010-10-14 16:04:05 +00006774 PropExpr->getBase()->getType();
6775
John McCall12f78a62010-12-02 01:19:52 +00006776 if (const ObjCObjectPointerType *OPT =
6777 BaseType->getAsObjCInterfacePointerType())
6778 if (ObjCInterfaceDecl *IFace = OPT->getInterfaceDecl())
6779 if (S.isPropertyReadonly(PDecl, IFace))
6780 return true;
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00006781 }
6782 return false;
6783}
6784
Fariborz Jahanian14086762011-03-28 23:47:18 +00006785static bool IsConstProperty(Expr *E, Sema &S) {
6786 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) {
6787 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E);
6788 if (PropExpr->isImplicitProperty()) return false;
6789
6790 ObjCPropertyDecl *PDecl = PropExpr->getExplicitProperty();
6791 QualType T = PDecl->getType();
6792 if (T->isReferenceType())
Fariborz Jahanian61750f22011-03-30 16:59:30 +00006793 T = T->getAs<ReferenceType>()->getPointeeType();
Fariborz Jahanian14086762011-03-28 23:47:18 +00006794 CanQualType CT = S.Context.getCanonicalType(T);
6795 return CT.isConstQualified();
6796 }
6797 return false;
6798}
6799
Fariborz Jahanian077f4902011-03-26 19:48:30 +00006800static bool IsReadonlyMessage(Expr *E, Sema &S) {
6801 if (E->getStmtClass() != Expr::MemberExprClass)
6802 return false;
6803 const MemberExpr *ME = cast<MemberExpr>(E);
6804 NamedDecl *Member = ME->getMemberDecl();
6805 if (isa<FieldDecl>(Member)) {
6806 Expr *Base = ME->getBase()->IgnoreParenImpCasts();
6807 if (Base->getStmtClass() != Expr::ObjCMessageExprClass)
6808 return false;
6809 return cast<ObjCMessageExpr>(Base)->getMethodDecl() != 0;
6810 }
6811 return false;
6812}
6813
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006814/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not,
6815/// emit an error and return true. If so, return false.
6816static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) {
Daniel Dunbar44e35f72009-04-15 00:08:05 +00006817 SourceLocation OrigLoc = Loc;
Mike Stump1eb44332009-09-09 15:08:12 +00006818 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context,
Daniel Dunbar44e35f72009-04-15 00:08:05 +00006819 &Loc);
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00006820 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S))
6821 IsLV = Expr::MLV_ReadonlyProperty;
Fariborz Jahanian14086762011-03-28 23:47:18 +00006822 else if (Expr::MLV_ConstQualified && IsConstProperty(E, S))
6823 IsLV = Expr::MLV_Valid;
Fariborz Jahanian077f4902011-03-26 19:48:30 +00006824 else if (IsLV == Expr::MLV_ClassTemporary && IsReadonlyMessage(E, S))
6825 IsLV = Expr::MLV_InvalidMessageExpression;
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006826 if (IsLV == Expr::MLV_Valid)
6827 return false;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006828
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006829 unsigned Diag = 0;
6830 bool NeedType = false;
6831 switch (IsLV) { // C99 6.5.16p2
John McCallf85e1932011-06-15 23:02:42 +00006832 case Expr::MLV_ConstQualified:
6833 Diag = diag::err_typecheck_assign_const;
6834
John McCall7acddac2011-06-17 06:42:21 +00006835 // In ARC, use some specialized diagnostics for occasions where we
6836 // infer 'const'. These are always pseudo-strong variables.
John McCallf85e1932011-06-15 23:02:42 +00006837 if (S.getLangOptions().ObjCAutoRefCount) {
6838 DeclRefExpr *declRef = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts());
6839 if (declRef && isa<VarDecl>(declRef->getDecl())) {
6840 VarDecl *var = cast<VarDecl>(declRef->getDecl());
6841
John McCall7acddac2011-06-17 06:42:21 +00006842 // Use the normal diagnostic if it's pseudo-__strong but the
6843 // user actually wrote 'const'.
6844 if (var->isARCPseudoStrong() &&
6845 (!var->getTypeSourceInfo() ||
6846 !var->getTypeSourceInfo()->getType().isConstQualified())) {
6847 // There are two pseudo-strong cases:
6848 // - self
John McCallf85e1932011-06-15 23:02:42 +00006849 ObjCMethodDecl *method = S.getCurMethodDecl();
6850 if (method && var == method->getSelfDecl())
6851 Diag = diag::err_typecheck_arr_assign_self;
John McCall7acddac2011-06-17 06:42:21 +00006852
6853 // - fast enumeration variables
6854 else
John McCallf85e1932011-06-15 23:02:42 +00006855 Diag = diag::err_typecheck_arr_assign_enumeration;
John McCall7acddac2011-06-17 06:42:21 +00006856
John McCallf85e1932011-06-15 23:02:42 +00006857 SourceRange Assign;
6858 if (Loc != OrigLoc)
6859 Assign = SourceRange(OrigLoc, OrigLoc);
6860 S.Diag(Loc, Diag) << E->getSourceRange() << Assign;
6861 // We need to preserve the AST regardless, so migration tool
6862 // can do its job.
6863 return false;
6864 }
6865 }
6866 }
6867
6868 break;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006869 case Expr::MLV_ArrayType:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006870 Diag = diag::err_typecheck_array_not_modifiable_lvalue;
6871 NeedType = true;
6872 break;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006873 case Expr::MLV_NotObjectType:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006874 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue;
6875 NeedType = true;
6876 break;
Chris Lattnerca354fa2008-11-17 19:51:54 +00006877 case Expr::MLV_LValueCast:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006878 Diag = diag::err_typecheck_lvalue_casts_not_supported;
6879 break;
Douglas Gregore873fb72010-02-16 21:39:57 +00006880 case Expr::MLV_Valid:
6881 llvm_unreachable("did not take early return for MLV_Valid");
Chris Lattner5cf216b2008-01-04 18:04:52 +00006882 case Expr::MLV_InvalidExpression:
Douglas Gregore873fb72010-02-16 21:39:57 +00006883 case Expr::MLV_MemberFunction:
6884 case Expr::MLV_ClassTemporary:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006885 Diag = diag::err_typecheck_expression_not_modifiable_lvalue;
6886 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00006887 case Expr::MLV_IncompleteType:
6888 case Expr::MLV_IncompleteVoidType:
Douglas Gregor86447ec2009-03-09 16:13:40 +00006889 return S.RequireCompleteType(Loc, E->getType(),
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00006890 S.PDiag(diag::err_typecheck_incomplete_type_not_modifiable_lvalue)
Anders Carlssonb7906612009-08-26 23:45:07 +00006891 << E->getSourceRange());
Chris Lattner5cf216b2008-01-04 18:04:52 +00006892 case Expr::MLV_DuplicateVectorComponents:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006893 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue;
6894 break;
Steve Naroff4f6a7d72008-09-26 14:41:28 +00006895 case Expr::MLV_NotBlockQualified:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006896 Diag = diag::err_block_decl_ref_not_modifiable_lvalue;
6897 break;
Fariborz Jahanian5daf5702008-11-22 18:39:36 +00006898 case Expr::MLV_ReadonlyProperty:
6899 Diag = diag::error_readonly_property_assignment;
6900 break;
Fariborz Jahanianba8d2d62008-11-22 20:25:50 +00006901 case Expr::MLV_NoSetterProperty:
6902 Diag = diag::error_nosetter_property_assignment;
6903 break;
Fariborz Jahanian077f4902011-03-26 19:48:30 +00006904 case Expr::MLV_InvalidMessageExpression:
6905 Diag = diag::error_readonly_message_assignment;
6906 break;
Fariborz Jahanian2514a302009-12-15 23:59:41 +00006907 case Expr::MLV_SubObjCPropertySetting:
6908 Diag = diag::error_no_subobject_property_setting;
6909 break;
Reid Spencer5f016e22007-07-11 17:01:13 +00006910 }
Steve Naroffd1861fd2007-07-31 12:34:36 +00006911
Daniel Dunbar44e35f72009-04-15 00:08:05 +00006912 SourceRange Assign;
6913 if (Loc != OrigLoc)
6914 Assign = SourceRange(OrigLoc, OrigLoc);
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006915 if (NeedType)
Daniel Dunbar44e35f72009-04-15 00:08:05 +00006916 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign;
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006917 else
Mike Stump1eb44332009-09-09 15:08:12 +00006918 S.Diag(Loc, Diag) << E->getSourceRange() << Assign;
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006919 return true;
6920}
6921
6922
6923
6924// C99 6.5.16.1
John Wiegley429bb272011-04-08 18:41:53 +00006925QualType Sema::CheckAssignmentOperands(Expr *LHS, ExprResult &RHS,
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006926 SourceLocation Loc,
6927 QualType CompoundType) {
6928 // Verify that LHS is a modifiable lvalue, and emit error if not.
6929 if (CheckForModifiableLvalue(LHS, Loc, *this))
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006930 return QualType();
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006931
6932 QualType LHSType = LHS->getType();
Richard Trieu67e29332011-08-02 04:35:43 +00006933 QualType RHSType = CompoundType.isNull() ? RHS.get()->getType() :
6934 CompoundType;
Chris Lattner5cf216b2008-01-04 18:04:52 +00006935 AssignConvertType ConvTy;
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006936 if (CompoundType.isNull()) {
Fariborz Jahaniane2a901a2010-06-07 22:02:01 +00006937 QualType LHSTy(LHSType);
Chris Lattner2c156472008-08-21 18:04:13 +00006938 // Simple assignment "x = y".
John Wiegley429bb272011-04-08 18:41:53 +00006939 if (LHS->getObjectKind() == OK_ObjCProperty) {
6940 ExprResult LHSResult = Owned(LHS);
6941 ConvertPropertyForLValue(LHSResult, RHS, LHSTy);
6942 if (LHSResult.isInvalid())
6943 return QualType();
6944 LHS = LHSResult.take();
6945 }
Fariborz Jahaniane2a901a2010-06-07 22:02:01 +00006946 ConvTy = CheckSingleAssignmentConstraints(LHSTy, RHS);
John Wiegley429bb272011-04-08 18:41:53 +00006947 if (RHS.isInvalid())
6948 return QualType();
Fariborz Jahanianfa23c1d2009-01-13 23:34:40 +00006949 // Special case of NSObject attributes on c-style pointer types.
6950 if (ConvTy == IncompatiblePointer &&
6951 ((Context.isObjCNSObjectType(LHSType) &&
Steve Narofff4954562009-07-16 15:41:00 +00006952 RHSType->isObjCObjectPointerType()) ||
Fariborz Jahanianfa23c1d2009-01-13 23:34:40 +00006953 (Context.isObjCNSObjectType(RHSType) &&
Steve Narofff4954562009-07-16 15:41:00 +00006954 LHSType->isObjCObjectPointerType())))
Fariborz Jahanianfa23c1d2009-01-13 23:34:40 +00006955 ConvTy = Compatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006956
John McCallf89e55a2010-11-18 06:31:45 +00006957 if (ConvTy == Compatible &&
6958 getLangOptions().ObjCNonFragileABI &&
6959 LHSType->isObjCObjectType())
6960 Diag(Loc, diag::err_assignment_requires_nonfragile_object)
6961 << LHSType;
6962
Chris Lattner2c156472008-08-21 18:04:13 +00006963 // If the RHS is a unary plus or minus, check to see if they = and + are
6964 // right next to each other. If so, the user may have typo'd "x =+ 4"
6965 // instead of "x += 4".
John Wiegley429bb272011-04-08 18:41:53 +00006966 Expr *RHSCheck = RHS.get();
Chris Lattner2c156472008-08-21 18:04:13 +00006967 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck))
6968 RHSCheck = ICE->getSubExpr();
6969 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) {
John McCall2de56d12010-08-25 11:45:40 +00006970 if ((UO->getOpcode() == UO_Plus ||
6971 UO->getOpcode() == UO_Minus) &&
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006972 Loc.isFileID() && UO->getOperatorLoc().isFileID() &&
Chris Lattner2c156472008-08-21 18:04:13 +00006973 // Only if the two operators are exactly adjacent.
Chris Lattner399bd1b2009-03-08 06:51:10 +00006974 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() &&
6975 // And there is a space or other character before the subexpr of the
6976 // unary +/-. We don't want to warn on "x=-1".
Chris Lattner3e872092009-03-09 07:11:10 +00006977 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() &&
6978 UO->getSubExpr()->getLocStart().isFileID()) {
Chris Lattnerd3a94e22008-11-20 06:06:08 +00006979 Diag(Loc, diag::warn_not_compound_assign)
John McCall2de56d12010-08-25 11:45:40 +00006980 << (UO->getOpcode() == UO_Plus ? "+" : "-")
Chris Lattnerd3a94e22008-11-20 06:06:08 +00006981 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc());
Chris Lattner399bd1b2009-03-08 06:51:10 +00006982 }
Chris Lattner2c156472008-08-21 18:04:13 +00006983 }
John McCallf85e1932011-06-15 23:02:42 +00006984
6985 if (ConvTy == Compatible) {
6986 if (LHSType.getObjCLifetime() == Qualifiers::OCL_Strong)
6987 checkRetainCycles(LHS, RHS.get());
Fariborz Jahanian921c1432011-06-24 18:25:34 +00006988 else if (getLangOptions().ObjCAutoRefCount)
6989 checkUnsafeExprAssigns(Loc, LHS, RHS.get());
John McCallf85e1932011-06-15 23:02:42 +00006990 }
Chris Lattner2c156472008-08-21 18:04:13 +00006991 } else {
6992 // Compound assignment "x += y"
Douglas Gregorb608b982011-01-28 02:26:04 +00006993 ConvTy = CheckAssignmentConstraints(Loc, LHSType, RHSType);
Chris Lattner2c156472008-08-21 18:04:13 +00006994 }
Chris Lattner5cf216b2008-01-04 18:04:52 +00006995
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006996 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType,
John Wiegley429bb272011-04-08 18:41:53 +00006997 RHS.get(), AA_Assigning))
Chris Lattner5cf216b2008-01-04 18:04:52 +00006998 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006999
Argyrios Kyrtzidis8a285ae2011-04-26 17:41:22 +00007000 CheckForNullPointerDereference(*this, LHS);
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00007001
Reid Spencer5f016e22007-07-11 17:01:13 +00007002 // C99 6.5.16p3: The type of an assignment expression is the type of the
7003 // left operand unless the left operand has qualified type, in which case
Mike Stumpeed9cac2009-02-19 03:04:26 +00007004 // it is the unqualified version of the type of the left operand.
Reid Spencer5f016e22007-07-11 17:01:13 +00007005 // C99 6.5.16.1p2: In simple assignment, the value of the right operand
7006 // is converted to the type of the assignment expression (above).
Chris Lattner73d0d4f2007-08-30 17:45:32 +00007007 // C++ 5.17p1: the type of the assignment expression is that of its left
Douglas Gregor2d833e32009-05-02 00:36:19 +00007008 // operand.
John McCall2bf6f492010-10-12 02:19:57 +00007009 return (getLangOptions().CPlusPlus
7010 ? LHSType : LHSType.getUnqualifiedType());
Reid Spencer5f016e22007-07-11 17:01:13 +00007011}
7012
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007013// C99 6.5.17
John Wiegley429bb272011-04-08 18:41:53 +00007014static QualType CheckCommaOperands(Sema &S, ExprResult &LHS, ExprResult &RHS,
John McCall09431682010-11-18 19:01:18 +00007015 SourceLocation Loc) {
John Wiegley429bb272011-04-08 18:41:53 +00007016 S.DiagnoseUnusedExprResult(LHS.get());
Argyrios Kyrtzidis25973452010-06-30 10:53:14 +00007017
John McCallfb8721c2011-04-10 19:13:55 +00007018 LHS = S.CheckPlaceholderExpr(LHS.take());
7019 RHS = S.CheckPlaceholderExpr(RHS.take());
John Wiegley429bb272011-04-08 18:41:53 +00007020 if (LHS.isInvalid() || RHS.isInvalid())
Douglas Gregor7ad5d422010-11-09 21:07:58 +00007021 return QualType();
7022
John McCallcf2e5062010-10-12 07:14:40 +00007023 // C's comma performs lvalue conversion (C99 6.3.2.1) on both its
7024 // operands, but not unary promotions.
7025 // C++'s comma does not do any conversions at all (C++ [expr.comma]p1).
Eli Friedmanb1d796d2009-03-23 00:24:07 +00007026
John McCallf6a16482010-12-04 03:47:34 +00007027 // So we treat the LHS as a ignored value, and in C++ we allow the
7028 // containing site to determine what should be done with the RHS.
John Wiegley429bb272011-04-08 18:41:53 +00007029 LHS = S.IgnoredValueConversions(LHS.take());
7030 if (LHS.isInvalid())
7031 return QualType();
John McCallf6a16482010-12-04 03:47:34 +00007032
7033 if (!S.getLangOptions().CPlusPlus) {
John Wiegley429bb272011-04-08 18:41:53 +00007034 RHS = S.DefaultFunctionArrayLvalueConversion(RHS.take());
7035 if (RHS.isInvalid())
7036 return QualType();
7037 if (!RHS.get()->getType()->isVoidType())
Richard Trieu67e29332011-08-02 04:35:43 +00007038 S.RequireCompleteType(Loc, RHS.get()->getType(),
7039 diag::err_incomplete_type);
John McCallcf2e5062010-10-12 07:14:40 +00007040 }
Eli Friedmanb1d796d2009-03-23 00:24:07 +00007041
John Wiegley429bb272011-04-08 18:41:53 +00007042 return RHS.get()->getType();
Reid Spencer5f016e22007-07-11 17:01:13 +00007043}
7044
Steve Naroff49b45262007-07-13 16:58:59 +00007045/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine
7046/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions.
John McCall09431682010-11-18 19:01:18 +00007047static QualType CheckIncrementDecrementOperand(Sema &S, Expr *Op,
7048 ExprValueKind &VK,
7049 SourceLocation OpLoc,
7050 bool isInc, bool isPrefix) {
Sebastian Redl28507842009-02-26 14:39:58 +00007051 if (Op->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00007052 return S.Context.DependentTy;
Sebastian Redl28507842009-02-26 14:39:58 +00007053
Chris Lattner3528d352008-11-21 07:05:48 +00007054 QualType ResType = Op->getType();
7055 assert(!ResType.isNull() && "no type for increment/decrement expression");
Reid Spencer5f016e22007-07-11 17:01:13 +00007056
John McCall09431682010-11-18 19:01:18 +00007057 if (S.getLangOptions().CPlusPlus && ResType->isBooleanType()) {
Sebastian Redle6d5a4a2008-12-20 09:35:34 +00007058 // Decrement of bool is not allowed.
7059 if (!isInc) {
John McCall09431682010-11-18 19:01:18 +00007060 S.Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange();
Sebastian Redle6d5a4a2008-12-20 09:35:34 +00007061 return QualType();
7062 }
7063 // Increment of bool sets it to true, but is deprecated.
John McCall09431682010-11-18 19:01:18 +00007064 S.Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange();
Sebastian Redle6d5a4a2008-12-20 09:35:34 +00007065 } else if (ResType->isRealType()) {
Chris Lattner3528d352008-11-21 07:05:48 +00007066 // OK!
Steve Naroff58f9f2c2009-07-14 18:25:06 +00007067 } else if (ResType->isAnyPointerType()) {
7068 QualType PointeeTy = ResType->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00007069
Chris Lattner3528d352008-11-21 07:05:48 +00007070 // C99 6.5.2.4p2, 6.5.6p2
Chandler Carruth13b21be2011-06-27 08:02:19 +00007071 if (!checkArithmeticOpPointerOperand(S, OpLoc, Op))
Douglas Gregor4ec339f2009-01-19 19:26:10 +00007072 return QualType();
Chandler Carruth13b21be2011-06-27 08:02:19 +00007073
Fariborz Jahanian9f8a04f2009-07-16 17:59:14 +00007074 // Diagnose bad cases where we step over interface counts.
John McCall09431682010-11-18 19:01:18 +00007075 else if (PointeeTy->isObjCObjectType() && S.LangOpts.ObjCNonFragileABI) {
7076 S.Diag(OpLoc, diag::err_arithmetic_nonfragile_interface)
Fariborz Jahanian9f8a04f2009-07-16 17:59:14 +00007077 << PointeeTy << Op->getSourceRange();
7078 return QualType();
7079 }
Eli Friedman5b088a12010-01-03 00:20:48 +00007080 } else if (ResType->isAnyComplexType()) {
Chris Lattner3528d352008-11-21 07:05:48 +00007081 // C99 does not support ++/-- on complex types, we allow as an extension.
John McCall09431682010-11-18 19:01:18 +00007082 S.Diag(OpLoc, diag::ext_integer_increment_complex)
Chris Lattnerd1625842008-11-24 06:25:27 +00007083 << ResType << Op->getSourceRange();
John McCall2cd11fe2010-10-12 02:09:17 +00007084 } else if (ResType->isPlaceholderType()) {
John McCallfb8721c2011-04-10 19:13:55 +00007085 ExprResult PR = S.CheckPlaceholderExpr(Op);
John McCall2cd11fe2010-10-12 02:09:17 +00007086 if (PR.isInvalid()) return QualType();
John McCall09431682010-11-18 19:01:18 +00007087 return CheckIncrementDecrementOperand(S, PR.take(), VK, OpLoc,
7088 isInc, isPrefix);
Anton Yartsev683564a2011-02-07 02:17:30 +00007089 } else if (S.getLangOptions().AltiVec && ResType->isVectorType()) {
7090 // OK! ( C/C++ Language Extensions for CBEA(Version 2.6) 10.3 )
Chris Lattner3528d352008-11-21 07:05:48 +00007091 } else {
John McCall09431682010-11-18 19:01:18 +00007092 S.Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement)
Douglas Gregor5cc07df2009-12-15 16:44:32 +00007093 << ResType << int(isInc) << Op->getSourceRange();
Chris Lattner3528d352008-11-21 07:05:48 +00007094 return QualType();
Reid Spencer5f016e22007-07-11 17:01:13 +00007095 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007096 // At this point, we know we have a real, complex or pointer type.
Steve Naroffdd10e022007-08-23 21:37:33 +00007097 // Now make sure the operand is a modifiable lvalue.
John McCall09431682010-11-18 19:01:18 +00007098 if (CheckForModifiableLvalue(Op, OpLoc, S))
Reid Spencer5f016e22007-07-11 17:01:13 +00007099 return QualType();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00007100 // In C++, a prefix increment is the same type as the operand. Otherwise
7101 // (in C or with postfix), the increment is the unqualified type of the
7102 // operand.
John McCall09431682010-11-18 19:01:18 +00007103 if (isPrefix && S.getLangOptions().CPlusPlus) {
7104 VK = VK_LValue;
7105 return ResType;
7106 } else {
7107 VK = VK_RValue;
7108 return ResType.getUnqualifiedType();
7109 }
Reid Spencer5f016e22007-07-11 17:01:13 +00007110}
7111
John Wiegley429bb272011-04-08 18:41:53 +00007112ExprResult Sema::ConvertPropertyForRValue(Expr *E) {
John McCallf6a16482010-12-04 03:47:34 +00007113 assert(E->getValueKind() == VK_LValue &&
7114 E->getObjectKind() == OK_ObjCProperty);
7115 const ObjCPropertyRefExpr *PRE = E->getObjCProperty();
7116
Douglas Gregor926df6c2011-06-11 01:09:30 +00007117 QualType T = E->getType();
7118 QualType ReceiverType;
7119 if (PRE->isObjectReceiver())
7120 ReceiverType = PRE->getBase()->getType();
7121 else if (PRE->isSuperReceiver())
7122 ReceiverType = PRE->getSuperReceiverType();
7123 else
7124 ReceiverType = Context.getObjCInterfaceType(PRE->getClassReceiver());
7125
John McCallf6a16482010-12-04 03:47:34 +00007126 ExprValueKind VK = VK_RValue;
7127 if (PRE->isImplicitProperty()) {
Douglas Gregor926df6c2011-06-11 01:09:30 +00007128 if (ObjCMethodDecl *GetterMethod =
Fariborz Jahanian99130e52010-12-22 19:46:35 +00007129 PRE->getImplicitPropertyGetter()) {
Douglas Gregor926df6c2011-06-11 01:09:30 +00007130 T = getMessageSendResultType(ReceiverType, GetterMethod,
7131 PRE->isClassReceiver(),
7132 PRE->isSuperReceiver());
7133 VK = Expr::getValueKindForType(GetterMethod->getResultType());
Fariborz Jahanian99130e52010-12-22 19:46:35 +00007134 }
7135 else {
7136 Diag(PRE->getLocation(), diag::err_getter_not_found)
7137 << PRE->getBase()->getType();
7138 }
John McCallf6a16482010-12-04 03:47:34 +00007139 }
Douglas Gregor926df6c2011-06-11 01:09:30 +00007140
7141 E = ImplicitCastExpr::Create(Context, T, CK_GetObjCProperty,
John McCallf6a16482010-12-04 03:47:34 +00007142 E, 0, VK);
John McCalldb67e2f2010-12-10 01:49:45 +00007143
7144 ExprResult Result = MaybeBindToTemporary(E);
7145 if (!Result.isInvalid())
7146 E = Result.take();
John Wiegley429bb272011-04-08 18:41:53 +00007147
7148 return Owned(E);
John McCallf6a16482010-12-04 03:47:34 +00007149}
7150
Richard Trieu67e29332011-08-02 04:35:43 +00007151void Sema::ConvertPropertyForLValue(ExprResult &LHS, ExprResult &RHS,
7152 QualType &LHSTy) {
John Wiegley429bb272011-04-08 18:41:53 +00007153 assert(LHS.get()->getValueKind() == VK_LValue &&
7154 LHS.get()->getObjectKind() == OK_ObjCProperty);
7155 const ObjCPropertyRefExpr *PropRef = LHS.get()->getObjCProperty();
John McCallf6a16482010-12-04 03:47:34 +00007156
John McCallf85e1932011-06-15 23:02:42 +00007157 bool Consumed = false;
7158
John Wiegley429bb272011-04-08 18:41:53 +00007159 if (PropRef->isImplicitProperty()) {
John McCallf6a16482010-12-04 03:47:34 +00007160 // If using property-dot syntax notation for assignment, and there is a
7161 // setter, RHS expression is being passed to the setter argument. So,
7162 // type conversion (and comparison) is RHS to setter's argument type.
John Wiegley429bb272011-04-08 18:41:53 +00007163 if (const ObjCMethodDecl *SetterMD = PropRef->getImplicitPropertySetter()) {
John McCallf6a16482010-12-04 03:47:34 +00007164 ObjCMethodDecl::param_iterator P = SetterMD->param_begin();
7165 LHSTy = (*P)->getType();
John McCallf85e1932011-06-15 23:02:42 +00007166 Consumed = (getLangOptions().ObjCAutoRefCount &&
7167 (*P)->hasAttr<NSConsumedAttr>());
John McCallf6a16482010-12-04 03:47:34 +00007168
7169 // Otherwise, if the getter returns an l-value, just call that.
7170 } else {
John Wiegley429bb272011-04-08 18:41:53 +00007171 QualType Result = PropRef->getImplicitPropertyGetter()->getResultType();
John McCallf6a16482010-12-04 03:47:34 +00007172 ExprValueKind VK = Expr::getValueKindForType(Result);
7173 if (VK == VK_LValue) {
John Wiegley429bb272011-04-08 18:41:53 +00007174 LHS = ImplicitCastExpr::Create(Context, LHS.get()->getType(),
7175 CK_GetObjCProperty, LHS.take(), 0, VK);
John McCallf6a16482010-12-04 03:47:34 +00007176 return;
John McCall12f78a62010-12-02 01:19:52 +00007177 }
Fariborz Jahanianc4e1a682010-09-14 23:02:38 +00007178 }
John McCallf85e1932011-06-15 23:02:42 +00007179 } else if (getLangOptions().ObjCAutoRefCount) {
7180 const ObjCMethodDecl *setter
7181 = PropRef->getExplicitProperty()->getSetterMethodDecl();
7182 if (setter) {
7183 ObjCMethodDecl::param_iterator P = setter->param_begin();
7184 LHSTy = (*P)->getType();
7185 Consumed = (*P)->hasAttr<NSConsumedAttr>();
7186 }
John McCallf6a16482010-12-04 03:47:34 +00007187 }
7188
John McCallf85e1932011-06-15 23:02:42 +00007189 if ((getLangOptions().CPlusPlus && LHSTy->isRecordType()) ||
7190 getLangOptions().ObjCAutoRefCount) {
Fariborz Jahanianc4e1a682010-09-14 23:02:38 +00007191 InitializedEntity Entity =
John McCallf85e1932011-06-15 23:02:42 +00007192 InitializedEntity::InitializeParameter(Context, LHSTy, Consumed);
John Wiegley429bb272011-04-08 18:41:53 +00007193 ExprResult ArgE = PerformCopyInitialization(Entity, SourceLocation(), RHS);
John McCallf85e1932011-06-15 23:02:42 +00007194 if (!ArgE.isInvalid()) {
John Wiegley429bb272011-04-08 18:41:53 +00007195 RHS = ArgE;
John McCallf85e1932011-06-15 23:02:42 +00007196 if (getLangOptions().ObjCAutoRefCount && !PropRef->isSuperReceiver())
7197 checkRetainCycles(const_cast<Expr*>(PropRef->getBase()), RHS.get());
7198 }
Fariborz Jahanianc4e1a682010-09-14 23:02:38 +00007199 }
7200}
7201
7202
Anders Carlsson369dee42008-02-01 07:15:58 +00007203/// getPrimaryDecl - Helper function for CheckAddressOfOperand().
Reid Spencer5f016e22007-07-11 17:01:13 +00007204/// This routine allows us to typecheck complex/recursive expressions
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00007205/// where the declaration is needed for type checking. We only need to
7206/// handle cases when the expression references a function designator
7207/// or is an lvalue. Here are some examples:
7208/// - &(x) => x
7209/// - &*****f => f for f a function designator.
7210/// - &s.xx => s
7211/// - &s.zz[1].yy -> s, if zz is an array
7212/// - *(x + 1) -> x, if x is an array
7213/// - &"123"[2] -> 0
7214/// - & __real__ x -> x
John McCall5808ce42011-02-03 08:15:49 +00007215static ValueDecl *getPrimaryDecl(Expr *E) {
Chris Lattnerf0467b32008-04-02 04:24:33 +00007216 switch (E->getStmtClass()) {
Reid Spencer5f016e22007-07-11 17:01:13 +00007217 case Stmt::DeclRefExprClass:
Chris Lattnerf0467b32008-04-02 04:24:33 +00007218 return cast<DeclRefExpr>(E)->getDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +00007219 case Stmt::MemberExprClass:
Eli Friedman23d58ce2009-04-20 08:23:18 +00007220 // If this is an arrow operator, the address is an offset from
7221 // the base's value, so the object the base refers to is
7222 // irrelevant.
Chris Lattnerf0467b32008-04-02 04:24:33 +00007223 if (cast<MemberExpr>(E)->isArrow())
Chris Lattnerf82228f2007-11-16 17:46:48 +00007224 return 0;
Eli Friedman23d58ce2009-04-20 08:23:18 +00007225 // Otherwise, the expression refers to a part of the base
Chris Lattnerf0467b32008-04-02 04:24:33 +00007226 return getPrimaryDecl(cast<MemberExpr>(E)->getBase());
Anders Carlsson369dee42008-02-01 07:15:58 +00007227 case Stmt::ArraySubscriptExprClass: {
Mike Stump390b4cc2009-05-16 07:39:55 +00007228 // FIXME: This code shouldn't be necessary! We should catch the implicit
7229 // promotion of register arrays earlier.
Eli Friedman23d58ce2009-04-20 08:23:18 +00007230 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase();
7231 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) {
7232 if (ICE->getSubExpr()->getType()->isArrayType())
7233 return getPrimaryDecl(ICE->getSubExpr());
7234 }
7235 return 0;
Anders Carlsson369dee42008-02-01 07:15:58 +00007236 }
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00007237 case Stmt::UnaryOperatorClass: {
7238 UnaryOperator *UO = cast<UnaryOperator>(E);
Mike Stumpeed9cac2009-02-19 03:04:26 +00007239
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00007240 switch(UO->getOpcode()) {
John McCall2de56d12010-08-25 11:45:40 +00007241 case UO_Real:
7242 case UO_Imag:
7243 case UO_Extension:
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00007244 return getPrimaryDecl(UO->getSubExpr());
7245 default:
7246 return 0;
7247 }
7248 }
Reid Spencer5f016e22007-07-11 17:01:13 +00007249 case Stmt::ParenExprClass:
Chris Lattnerf0467b32008-04-02 04:24:33 +00007250 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr());
Chris Lattnerf82228f2007-11-16 17:46:48 +00007251 case Stmt::ImplicitCastExprClass:
Eli Friedman23d58ce2009-04-20 08:23:18 +00007252 // If the result of an implicit cast is an l-value, we care about
7253 // the sub-expression; otherwise, the result here doesn't matter.
Chris Lattnerf0467b32008-04-02 04:24:33 +00007254 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr());
Reid Spencer5f016e22007-07-11 17:01:13 +00007255 default:
7256 return 0;
7257 }
7258}
7259
7260/// CheckAddressOfOperand - The operand of & must be either a function
Mike Stumpeed9cac2009-02-19 03:04:26 +00007261/// designator or an lvalue designating an object. If it is an lvalue, the
Reid Spencer5f016e22007-07-11 17:01:13 +00007262/// object cannot be declared with storage class register or be a bit field.
Mike Stumpeed9cac2009-02-19 03:04:26 +00007263/// Note: The usual conversions are *not* applied to the operand of the &
Reid Spencer5f016e22007-07-11 17:01:13 +00007264/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue.
Mike Stumpeed9cac2009-02-19 03:04:26 +00007265/// In C++, the operand might be an overloaded function name, in which case
Douglas Gregor904eed32008-11-10 20:40:00 +00007266/// we allow the '&' but retain the overloaded-function type.
John McCall09431682010-11-18 19:01:18 +00007267static QualType CheckAddressOfOperand(Sema &S, Expr *OrigOp,
7268 SourceLocation OpLoc) {
John McCall9c72c602010-08-27 09:08:28 +00007269 if (OrigOp->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00007270 return S.Context.DependentTy;
7271 if (OrigOp->getType() == S.Context.OverloadTy)
7272 return S.Context.OverloadTy;
John McCall755d8492011-04-12 00:42:48 +00007273 if (OrigOp->getType() == S.Context.UnknownAnyTy)
7274 return S.Context.UnknownAnyTy;
John McCall864c0412011-04-26 20:42:42 +00007275 if (OrigOp->getType() == S.Context.BoundMemberTy) {
7276 S.Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
7277 << OrigOp->getSourceRange();
7278 return QualType();
7279 }
John McCall9c72c602010-08-27 09:08:28 +00007280
John McCall755d8492011-04-12 00:42:48 +00007281 assert(!OrigOp->getType()->isPlaceholderType());
John McCall2cd11fe2010-10-12 02:09:17 +00007282
John McCall9c72c602010-08-27 09:08:28 +00007283 // Make sure to ignore parentheses in subsequent checks
7284 Expr *op = OrigOp->IgnoreParens();
Douglas Gregor9103bb22008-12-17 22:52:20 +00007285
John McCall09431682010-11-18 19:01:18 +00007286 if (S.getLangOptions().C99) {
Steve Naroff08f19672008-01-13 17:10:08 +00007287 // Implement C99-only parts of addressof rules.
7288 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) {
John McCall2de56d12010-08-25 11:45:40 +00007289 if (uOp->getOpcode() == UO_Deref)
Steve Naroff08f19672008-01-13 17:10:08 +00007290 // Per C99 6.5.3.2, the address of a deref always returns a valid result
7291 // (assuming the deref expression is valid).
7292 return uOp->getSubExpr()->getType();
7293 }
7294 // Technically, there should be a check for array subscript
7295 // expressions here, but the result of one is always an lvalue anyway.
7296 }
John McCall5808ce42011-02-03 08:15:49 +00007297 ValueDecl *dcl = getPrimaryDecl(op);
John McCall7eb0a9e2010-11-24 05:12:34 +00007298 Expr::LValueClassification lval = op->ClassifyLValue(S.Context);
Nuno Lopes6b6609f2008-12-16 22:59:47 +00007299
Fariborz Jahanian077f4902011-03-26 19:48:30 +00007300 if (lval == Expr::LV_ClassTemporary) {
John McCall09431682010-11-18 19:01:18 +00007301 bool sfinae = S.isSFINAEContext();
7302 S.Diag(OpLoc, sfinae ? diag::err_typecheck_addrof_class_temporary
7303 : diag::ext_typecheck_addrof_class_temporary)
Douglas Gregore873fb72010-02-16 21:39:57 +00007304 << op->getType() << op->getSourceRange();
John McCall09431682010-11-18 19:01:18 +00007305 if (sfinae)
Douglas Gregore873fb72010-02-16 21:39:57 +00007306 return QualType();
John McCall9c72c602010-08-27 09:08:28 +00007307 } else if (isa<ObjCSelectorExpr>(op)) {
John McCall09431682010-11-18 19:01:18 +00007308 return S.Context.getPointerType(op->getType());
John McCall9c72c602010-08-27 09:08:28 +00007309 } else if (lval == Expr::LV_MemberFunction) {
7310 // If it's an instance method, make a member pointer.
7311 // The expression must have exactly the form &A::foo.
7312
7313 // If the underlying expression isn't a decl ref, give up.
7314 if (!isa<DeclRefExpr>(op)) {
John McCall09431682010-11-18 19:01:18 +00007315 S.Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
John McCall9c72c602010-08-27 09:08:28 +00007316 << OrigOp->getSourceRange();
7317 return QualType();
7318 }
7319 DeclRefExpr *DRE = cast<DeclRefExpr>(op);
7320 CXXMethodDecl *MD = cast<CXXMethodDecl>(DRE->getDecl());
7321
7322 // The id-expression was parenthesized.
7323 if (OrigOp != DRE) {
John McCall09431682010-11-18 19:01:18 +00007324 S.Diag(OpLoc, diag::err_parens_pointer_member_function)
John McCall9c72c602010-08-27 09:08:28 +00007325 << OrigOp->getSourceRange();
7326
7327 // The method was named without a qualifier.
7328 } else if (!DRE->getQualifier()) {
John McCall09431682010-11-18 19:01:18 +00007329 S.Diag(OpLoc, diag::err_unqualified_pointer_member_function)
John McCall9c72c602010-08-27 09:08:28 +00007330 << op->getSourceRange();
7331 }
7332
John McCall09431682010-11-18 19:01:18 +00007333 return S.Context.getMemberPointerType(op->getType(),
7334 S.Context.getTypeDeclType(MD->getParent()).getTypePtr());
John McCall9c72c602010-08-27 09:08:28 +00007335 } else if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) {
Eli Friedman441cf102009-05-16 23:27:50 +00007336 // C99 6.5.3.2p1
Eli Friedman23d58ce2009-04-20 08:23:18 +00007337 // The operand must be either an l-value or a function designator
Eli Friedman441cf102009-05-16 23:27:50 +00007338 if (!op->getType()->isFunctionType()) {
Chris Lattnerf82228f2007-11-16 17:46:48 +00007339 // FIXME: emit more specific diag...
John McCall09431682010-11-18 19:01:18 +00007340 S.Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof)
Chris Lattnerdcd5ef12008-11-19 05:27:50 +00007341 << op->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00007342 return QualType();
7343 }
John McCall7eb0a9e2010-11-24 05:12:34 +00007344 } else if (op->getObjectKind() == OK_BitField) { // C99 6.5.3.2p1
Eli Friedman23d58ce2009-04-20 08:23:18 +00007345 // The operand cannot be a bit-field
John McCall09431682010-11-18 19:01:18 +00007346 S.Diag(OpLoc, diag::err_typecheck_address_of)
Eli Friedman23d58ce2009-04-20 08:23:18 +00007347 << "bit-field" << op->getSourceRange();
Douglas Gregor86f19402008-12-20 23:49:58 +00007348 return QualType();
John McCall7eb0a9e2010-11-24 05:12:34 +00007349 } else if (op->getObjectKind() == OK_VectorComponent) {
Eli Friedman23d58ce2009-04-20 08:23:18 +00007350 // The operand cannot be an element of a vector
John McCall09431682010-11-18 19:01:18 +00007351 S.Diag(OpLoc, diag::err_typecheck_address_of)
Nate Begemanb104b1f2009-02-15 22:45:20 +00007352 << "vector element" << op->getSourceRange();
Steve Naroffbcb2b612008-02-29 23:30:25 +00007353 return QualType();
John McCall7eb0a9e2010-11-24 05:12:34 +00007354 } else if (op->getObjectKind() == OK_ObjCProperty) {
Fariborz Jahanian0337f212009-07-07 18:50:52 +00007355 // cannot take address of a property expression.
John McCall09431682010-11-18 19:01:18 +00007356 S.Diag(OpLoc, diag::err_typecheck_address_of)
Fariborz Jahanian0337f212009-07-07 18:50:52 +00007357 << "property expression" << op->getSourceRange();
7358 return QualType();
Steve Naroffbcb2b612008-02-29 23:30:25 +00007359 } else if (dcl) { // C99 6.5.3.2p1
Mike Stumpeed9cac2009-02-19 03:04:26 +00007360 // We have an lvalue with a decl. Make sure the decl is not declared
Reid Spencer5f016e22007-07-11 17:01:13 +00007361 // with the register storage-class specifier.
7362 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) {
Fariborz Jahanian4020f872010-08-24 22:21:48 +00007363 // in C++ it is not error to take address of a register
7364 // variable (c++03 7.1.1P3)
John McCalld931b082010-08-26 03:08:43 +00007365 if (vd->getStorageClass() == SC_Register &&
John McCall09431682010-11-18 19:01:18 +00007366 !S.getLangOptions().CPlusPlus) {
7367 S.Diag(OpLoc, diag::err_typecheck_address_of)
Chris Lattnerd3a94e22008-11-20 06:06:08 +00007368 << "register variable" << op->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00007369 return QualType();
7370 }
John McCallba135432009-11-21 08:51:07 +00007371 } else if (isa<FunctionTemplateDecl>(dcl)) {
John McCall09431682010-11-18 19:01:18 +00007372 return S.Context.OverloadTy;
John McCall5808ce42011-02-03 08:15:49 +00007373 } else if (isa<FieldDecl>(dcl) || isa<IndirectFieldDecl>(dcl)) {
Douglas Gregor29882052008-12-10 21:26:49 +00007374 // Okay: we can take the address of a field.
Sebastian Redlebc07d52009-02-03 20:19:35 +00007375 // Could be a pointer to member, though, if there is an explicit
7376 // scope qualifier for the class.
Douglas Gregora2813ce2009-10-23 18:54:35 +00007377 if (isa<DeclRefExpr>(op) && cast<DeclRefExpr>(op)->getQualifier()) {
Sebastian Redlebc07d52009-02-03 20:19:35 +00007378 DeclContext *Ctx = dcl->getDeclContext();
Anders Carlssonf9e48bd2009-07-08 21:45:58 +00007379 if (Ctx && Ctx->isRecord()) {
John McCall5808ce42011-02-03 08:15:49 +00007380 if (dcl->getType()->isReferenceType()) {
John McCall09431682010-11-18 19:01:18 +00007381 S.Diag(OpLoc,
7382 diag::err_cannot_form_pointer_to_member_of_reference_type)
John McCall5808ce42011-02-03 08:15:49 +00007383 << dcl->getDeclName() << dcl->getType();
Anders Carlssonf9e48bd2009-07-08 21:45:58 +00007384 return QualType();
7385 }
Mike Stump1eb44332009-09-09 15:08:12 +00007386
Argyrios Kyrtzidis0413db42011-01-31 07:04:29 +00007387 while (cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion())
7388 Ctx = Ctx->getParent();
John McCall09431682010-11-18 19:01:18 +00007389 return S.Context.getMemberPointerType(op->getType(),
7390 S.Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr());
Anders Carlssonf9e48bd2009-07-08 21:45:58 +00007391 }
Sebastian Redlebc07d52009-02-03 20:19:35 +00007392 }
Anders Carlsson196f7d02009-05-16 21:43:42 +00007393 } else if (!isa<FunctionDecl>(dcl))
Reid Spencer5f016e22007-07-11 17:01:13 +00007394 assert(0 && "Unknown/unexpected decl type");
Reid Spencer5f016e22007-07-11 17:01:13 +00007395 }
Sebastian Redl33b399a2009-02-04 21:23:32 +00007396
Eli Friedman441cf102009-05-16 23:27:50 +00007397 if (lval == Expr::LV_IncompleteVoidType) {
7398 // Taking the address of a void variable is technically illegal, but we
7399 // allow it in cases which are otherwise valid.
7400 // Example: "extern void x; void* y = &x;".
John McCall09431682010-11-18 19:01:18 +00007401 S.Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange();
Eli Friedman441cf102009-05-16 23:27:50 +00007402 }
7403
Reid Spencer5f016e22007-07-11 17:01:13 +00007404 // If the operand has type "type", the result has type "pointer to type".
Douglas Gregor8f70ddb2010-07-29 16:05:45 +00007405 if (op->getType()->isObjCObjectType())
John McCall09431682010-11-18 19:01:18 +00007406 return S.Context.getObjCObjectPointerType(op->getType());
7407 return S.Context.getPointerType(op->getType());
Reid Spencer5f016e22007-07-11 17:01:13 +00007408}
7409
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007410/// CheckIndirectionOperand - Type check unary indirection (prefix '*').
John McCall09431682010-11-18 19:01:18 +00007411static QualType CheckIndirectionOperand(Sema &S, Expr *Op, ExprValueKind &VK,
7412 SourceLocation OpLoc) {
Sebastian Redl28507842009-02-26 14:39:58 +00007413 if (Op->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00007414 return S.Context.DependentTy;
Sebastian Redl28507842009-02-26 14:39:58 +00007415
John Wiegley429bb272011-04-08 18:41:53 +00007416 ExprResult ConvResult = S.UsualUnaryConversions(Op);
7417 if (ConvResult.isInvalid())
7418 return QualType();
7419 Op = ConvResult.take();
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007420 QualType OpTy = Op->getType();
7421 QualType Result;
Argyrios Kyrtzidisf4bbbf02011-05-02 18:21:19 +00007422
7423 if (isa<CXXReinterpretCastExpr>(Op)) {
7424 QualType OpOrigType = Op->IgnoreParenCasts()->getType();
7425 S.CheckCompatibleReinterpretCast(OpOrigType, OpTy, /*IsDereference*/true,
7426 Op->getSourceRange());
7427 }
7428
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007429 // Note that per both C89 and C99, indirection is always legal, even if OpTy
7430 // is an incomplete type or void. It would be possible to warn about
7431 // dereferencing a void pointer, but it's completely well-defined, and such a
7432 // warning is unlikely to catch any mistakes.
7433 if (const PointerType *PT = OpTy->getAs<PointerType>())
7434 Result = PT->getPointeeType();
7435 else if (const ObjCObjectPointerType *OPT =
7436 OpTy->getAs<ObjCObjectPointerType>())
7437 Result = OPT->getPointeeType();
John McCall2cd11fe2010-10-12 02:09:17 +00007438 else {
John McCallfb8721c2011-04-10 19:13:55 +00007439 ExprResult PR = S.CheckPlaceholderExpr(Op);
John McCall2cd11fe2010-10-12 02:09:17 +00007440 if (PR.isInvalid()) return QualType();
John McCall09431682010-11-18 19:01:18 +00007441 if (PR.take() != Op)
7442 return CheckIndirectionOperand(S, PR.take(), VK, OpLoc);
John McCall2cd11fe2010-10-12 02:09:17 +00007443 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007444
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007445 if (Result.isNull()) {
John McCall09431682010-11-18 19:01:18 +00007446 S.Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer)
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007447 << OpTy << Op->getSourceRange();
7448 return QualType();
7449 }
John McCall09431682010-11-18 19:01:18 +00007450
7451 // Dereferences are usually l-values...
7452 VK = VK_LValue;
7453
7454 // ...except that certain expressions are never l-values in C.
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00007455 if (!S.getLangOptions().CPlusPlus && Result.isCForbiddenLValueType())
John McCall09431682010-11-18 19:01:18 +00007456 VK = VK_RValue;
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007457
7458 return Result;
Reid Spencer5f016e22007-07-11 17:01:13 +00007459}
7460
John McCall2de56d12010-08-25 11:45:40 +00007461static inline BinaryOperatorKind ConvertTokenKindToBinaryOpcode(
Reid Spencer5f016e22007-07-11 17:01:13 +00007462 tok::TokenKind Kind) {
John McCall2de56d12010-08-25 11:45:40 +00007463 BinaryOperatorKind Opc;
Reid Spencer5f016e22007-07-11 17:01:13 +00007464 switch (Kind) {
7465 default: assert(0 && "Unknown binop!");
John McCall2de56d12010-08-25 11:45:40 +00007466 case tok::periodstar: Opc = BO_PtrMemD; break;
7467 case tok::arrowstar: Opc = BO_PtrMemI; break;
7468 case tok::star: Opc = BO_Mul; break;
7469 case tok::slash: Opc = BO_Div; break;
7470 case tok::percent: Opc = BO_Rem; break;
7471 case tok::plus: Opc = BO_Add; break;
7472 case tok::minus: Opc = BO_Sub; break;
7473 case tok::lessless: Opc = BO_Shl; break;
7474 case tok::greatergreater: Opc = BO_Shr; break;
7475 case tok::lessequal: Opc = BO_LE; break;
7476 case tok::less: Opc = BO_LT; break;
7477 case tok::greaterequal: Opc = BO_GE; break;
7478 case tok::greater: Opc = BO_GT; break;
7479 case tok::exclaimequal: Opc = BO_NE; break;
7480 case tok::equalequal: Opc = BO_EQ; break;
7481 case tok::amp: Opc = BO_And; break;
7482 case tok::caret: Opc = BO_Xor; break;
7483 case tok::pipe: Opc = BO_Or; break;
7484 case tok::ampamp: Opc = BO_LAnd; break;
7485 case tok::pipepipe: Opc = BO_LOr; break;
7486 case tok::equal: Opc = BO_Assign; break;
7487 case tok::starequal: Opc = BO_MulAssign; break;
7488 case tok::slashequal: Opc = BO_DivAssign; break;
7489 case tok::percentequal: Opc = BO_RemAssign; break;
7490 case tok::plusequal: Opc = BO_AddAssign; break;
7491 case tok::minusequal: Opc = BO_SubAssign; break;
7492 case tok::lesslessequal: Opc = BO_ShlAssign; break;
7493 case tok::greatergreaterequal: Opc = BO_ShrAssign; break;
7494 case tok::ampequal: Opc = BO_AndAssign; break;
7495 case tok::caretequal: Opc = BO_XorAssign; break;
7496 case tok::pipeequal: Opc = BO_OrAssign; break;
7497 case tok::comma: Opc = BO_Comma; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00007498 }
7499 return Opc;
7500}
7501
John McCall2de56d12010-08-25 11:45:40 +00007502static inline UnaryOperatorKind ConvertTokenKindToUnaryOpcode(
Reid Spencer5f016e22007-07-11 17:01:13 +00007503 tok::TokenKind Kind) {
John McCall2de56d12010-08-25 11:45:40 +00007504 UnaryOperatorKind Opc;
Reid Spencer5f016e22007-07-11 17:01:13 +00007505 switch (Kind) {
7506 default: assert(0 && "Unknown unary op!");
John McCall2de56d12010-08-25 11:45:40 +00007507 case tok::plusplus: Opc = UO_PreInc; break;
7508 case tok::minusminus: Opc = UO_PreDec; break;
7509 case tok::amp: Opc = UO_AddrOf; break;
7510 case tok::star: Opc = UO_Deref; break;
7511 case tok::plus: Opc = UO_Plus; break;
7512 case tok::minus: Opc = UO_Minus; break;
7513 case tok::tilde: Opc = UO_Not; break;
7514 case tok::exclaim: Opc = UO_LNot; break;
7515 case tok::kw___real: Opc = UO_Real; break;
7516 case tok::kw___imag: Opc = UO_Imag; break;
7517 case tok::kw___extension__: Opc = UO_Extension; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00007518 }
7519 return Opc;
7520}
7521
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00007522/// DiagnoseSelfAssignment - Emits a warning if a value is assigned to itself.
7523/// This warning is only emitted for builtin assignment operations. It is also
7524/// suppressed in the event of macro expansions.
7525static void DiagnoseSelfAssignment(Sema &S, Expr *lhs, Expr *rhs,
7526 SourceLocation OpLoc) {
7527 if (!S.ActiveTemplateInstantiations.empty())
7528 return;
7529 if (OpLoc.isInvalid() || OpLoc.isMacroID())
7530 return;
7531 lhs = lhs->IgnoreParenImpCasts();
7532 rhs = rhs->IgnoreParenImpCasts();
7533 const DeclRefExpr *LeftDeclRef = dyn_cast<DeclRefExpr>(lhs);
7534 const DeclRefExpr *RightDeclRef = dyn_cast<DeclRefExpr>(rhs);
7535 if (!LeftDeclRef || !RightDeclRef ||
7536 LeftDeclRef->getLocation().isMacroID() ||
7537 RightDeclRef->getLocation().isMacroID())
7538 return;
7539 const ValueDecl *LeftDecl =
7540 cast<ValueDecl>(LeftDeclRef->getDecl()->getCanonicalDecl());
7541 const ValueDecl *RightDecl =
7542 cast<ValueDecl>(RightDeclRef->getDecl()->getCanonicalDecl());
7543 if (LeftDecl != RightDecl)
7544 return;
7545 if (LeftDecl->getType().isVolatileQualified())
7546 return;
7547 if (const ReferenceType *RefTy = LeftDecl->getType()->getAs<ReferenceType>())
7548 if (RefTy->getPointeeType().isVolatileQualified())
7549 return;
7550
7551 S.Diag(OpLoc, diag::warn_self_assignment)
7552 << LeftDeclRef->getType()
7553 << lhs->getSourceRange() << rhs->getSourceRange();
7554}
7555
Douglas Gregoreaebc752008-11-06 23:29:22 +00007556/// CreateBuiltinBinOp - Creates a new built-in binary operation with
7557/// operator @p Opc at location @c TokLoc. This routine only supports
7558/// built-in operations; ActOnBinOp handles overloaded operators.
John McCall60d7b3a2010-08-24 06:29:42 +00007559ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc,
Argyrios Kyrtzidisb1fa3dc2011-01-05 20:09:36 +00007560 BinaryOperatorKind Opc,
John Wiegley429bb272011-04-08 18:41:53 +00007561 Expr *lhsExpr, Expr *rhsExpr) {
7562 ExprResult lhs = Owned(lhsExpr), rhs = Owned(rhsExpr);
Eli Friedmanab3a8522009-03-28 01:22:36 +00007563 QualType ResultTy; // Result type of the binary operator.
Eli Friedmanab3a8522009-03-28 01:22:36 +00007564 // The following two variables are used for compound assignment operators
7565 QualType CompLHSTy; // Type of LHS after promotions for computation
7566 QualType CompResultTy; // Type of computation result
John McCallf89e55a2010-11-18 06:31:45 +00007567 ExprValueKind VK = VK_RValue;
7568 ExprObjectKind OK = OK_Ordinary;
Douglas Gregoreaebc752008-11-06 23:29:22 +00007569
Douglas Gregorfadb53b2011-03-12 01:48:56 +00007570 // Check if a 'foo<int>' involved in a binary op, identifies a single
7571 // function unambiguously (i.e. an lvalue ala 13.4)
7572 // But since an assignment can trigger target based overload, exclude it in
7573 // our blind search. i.e:
7574 // template<class T> void f(); template<class T, class U> void f(U);
7575 // f<int> == 0; // resolve f<int> blindly
7576 // void (*p)(int); p = f<int>; // resolve f<int> using target
7577 if (Opc != BO_Assign) {
John McCallfb8721c2011-04-10 19:13:55 +00007578 ExprResult resolvedLHS = CheckPlaceholderExpr(lhs.get());
John McCall1de4d4e2011-04-07 08:22:57 +00007579 if (!resolvedLHS.isUsable()) return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00007580 lhs = move(resolvedLHS);
John McCall1de4d4e2011-04-07 08:22:57 +00007581
John McCallfb8721c2011-04-10 19:13:55 +00007582 ExprResult resolvedRHS = CheckPlaceholderExpr(rhs.get());
John McCall1de4d4e2011-04-07 08:22:57 +00007583 if (!resolvedRHS.isUsable()) return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00007584 rhs = move(resolvedRHS);
Douglas Gregorfadb53b2011-03-12 01:48:56 +00007585 }
7586
Eli Friedmaned3b2562011-06-17 20:52:22 +00007587 // The canonical way to check for a GNU null is with isNullPointerConstant,
7588 // but we use a bit of a hack here for speed; this is a relatively
7589 // hot path, and isNullPointerConstant is slow.
7590 bool LeftNull = isa<GNUNullExpr>(lhs.get()->IgnoreParenImpCasts());
7591 bool RightNull = isa<GNUNullExpr>(rhs.get()->IgnoreParenImpCasts());
Richard Trieu3e95ba92011-06-16 21:36:56 +00007592
7593 // Detect when a NULL constant is used improperly in an expression. These
7594 // are mainly cases where the null pointer is used as an integer instead
7595 // of a pointer.
7596 if (LeftNull || RightNull) {
Chandler Carruth1567a8b2011-06-20 07:38:51 +00007597 // Avoid analyzing cases where the result will either be invalid (and
7598 // diagnosed as such) or entirely valid and not something to warn about.
7599 QualType LeftType = lhs.get()->getType();
7600 QualType RightType = rhs.get()->getType();
7601 if (!LeftType->isBlockPointerType() && !LeftType->isMemberPointerType() &&
7602 !LeftType->isFunctionType() &&
7603 !RightType->isBlockPointerType() &&
7604 !RightType->isMemberPointerType() &&
7605 !RightType->isFunctionType()) {
7606 if (Opc == BO_Mul || Opc == BO_Div || Opc == BO_Rem || Opc == BO_Add ||
7607 Opc == BO_Sub || Opc == BO_Shl || Opc == BO_Shr || Opc == BO_And ||
7608 Opc == BO_Xor || Opc == BO_Or || Opc == BO_MulAssign ||
7609 Opc == BO_DivAssign || Opc == BO_AddAssign || Opc == BO_SubAssign ||
7610 Opc == BO_RemAssign || Opc == BO_ShlAssign || Opc == BO_ShrAssign ||
7611 Opc == BO_AndAssign || Opc == BO_OrAssign || Opc == BO_XorAssign) {
7612 // These are the operations that would not make sense with a null pointer
Richard Trieu67e29332011-08-02 04:35:43 +00007613 // pointer no matter what the other expression is.
Chandler Carruth2af68e42011-06-19 09:05:14 +00007614 Diag(OpLoc, diag::warn_null_in_arithmetic_operation)
Chandler Carruth1567a8b2011-06-20 07:38:51 +00007615 << (LeftNull ? lhs.get()->getSourceRange() : SourceRange())
7616 << (RightNull ? rhs.get()->getSourceRange() : SourceRange());
7617 } else if (Opc == BO_LE || Opc == BO_LT || Opc == BO_GE || Opc == BO_GT ||
7618 Opc == BO_EQ || Opc == BO_NE) {
7619 // These are the operations that would not make sense with a null pointer
7620 // if the other expression the other expression is not a pointer.
7621 if (LeftNull != RightNull &&
7622 !LeftType->isAnyPointerType() &&
7623 !LeftType->canDecayToPointerType() &&
7624 !RightType->isAnyPointerType() &&
7625 !RightType->canDecayToPointerType()) {
7626 Diag(OpLoc, diag::warn_null_in_arithmetic_operation)
7627 << (LeftNull ? lhs.get()->getSourceRange()
7628 : rhs.get()->getSourceRange());
7629 }
Richard Trieu3e95ba92011-06-16 21:36:56 +00007630 }
7631 }
7632 }
7633
Douglas Gregoreaebc752008-11-06 23:29:22 +00007634 switch (Opc) {
John McCall2de56d12010-08-25 11:45:40 +00007635 case BO_Assign:
John Wiegley429bb272011-04-08 18:41:53 +00007636 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, QualType());
John McCallf6a16482010-12-04 03:47:34 +00007637 if (getLangOptions().CPlusPlus &&
John Wiegley429bb272011-04-08 18:41:53 +00007638 lhs.get()->getObjectKind() != OK_ObjCProperty) {
7639 VK = lhs.get()->getValueKind();
7640 OK = lhs.get()->getObjectKind();
John McCallf89e55a2010-11-18 06:31:45 +00007641 }
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00007642 if (!ResultTy.isNull())
John Wiegley429bb272011-04-08 18:41:53 +00007643 DiagnoseSelfAssignment(*this, lhs.get(), rhs.get(), OpLoc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007644 break;
John McCall2de56d12010-08-25 11:45:40 +00007645 case BO_PtrMemD:
7646 case BO_PtrMemI:
John McCallf89e55a2010-11-18 06:31:45 +00007647 ResultTy = CheckPointerToMemberOperands(lhs, rhs, VK, OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00007648 Opc == BO_PtrMemI);
Sebastian Redl22460502009-02-07 00:15:38 +00007649 break;
John McCall2de56d12010-08-25 11:45:40 +00007650 case BO_Mul:
7651 case BO_Div:
Chris Lattner7ef655a2010-01-12 21:23:57 +00007652 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, false,
John McCall2de56d12010-08-25 11:45:40 +00007653 Opc == BO_Div);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007654 break;
John McCall2de56d12010-08-25 11:45:40 +00007655 case BO_Rem:
Douglas Gregoreaebc752008-11-06 23:29:22 +00007656 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc);
7657 break;
John McCall2de56d12010-08-25 11:45:40 +00007658 case BO_Add:
Douglas Gregoreaebc752008-11-06 23:29:22 +00007659 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc);
7660 break;
John McCall2de56d12010-08-25 11:45:40 +00007661 case BO_Sub:
Douglas Gregoreaebc752008-11-06 23:29:22 +00007662 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc);
7663 break;
John McCall2de56d12010-08-25 11:45:40 +00007664 case BO_Shl:
7665 case BO_Shr:
Chandler Carruth21206d52011-02-23 23:34:11 +00007666 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc, Opc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007667 break;
John McCall2de56d12010-08-25 11:45:40 +00007668 case BO_LE:
7669 case BO_LT:
7670 case BO_GE:
7671 case BO_GT:
Douglas Gregora86b8322009-04-06 18:45:53 +00007672 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007673 break;
John McCall2de56d12010-08-25 11:45:40 +00007674 case BO_EQ:
7675 case BO_NE:
Douglas Gregora86b8322009-04-06 18:45:53 +00007676 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007677 break;
John McCall2de56d12010-08-25 11:45:40 +00007678 case BO_And:
7679 case BO_Xor:
7680 case BO_Or:
Douglas Gregoreaebc752008-11-06 23:29:22 +00007681 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc);
7682 break;
John McCall2de56d12010-08-25 11:45:40 +00007683 case BO_LAnd:
7684 case BO_LOr:
Chris Lattner90a8f272010-07-13 19:41:32 +00007685 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc, Opc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007686 break;
John McCall2de56d12010-08-25 11:45:40 +00007687 case BO_MulAssign:
7688 case BO_DivAssign:
Chris Lattner7ef655a2010-01-12 21:23:57 +00007689 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true,
John McCallf89e55a2010-11-18 06:31:45 +00007690 Opc == BO_DivAssign);
Eli Friedmanab3a8522009-03-28 01:22:36 +00007691 CompLHSTy = CompResultTy;
John Wiegley429bb272011-04-08 18:41:53 +00007692 if (!CompResultTy.isNull() && !lhs.isInvalid() && !rhs.isInvalid())
7693 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007694 break;
John McCall2de56d12010-08-25 11:45:40 +00007695 case BO_RemAssign:
Eli Friedmanab3a8522009-03-28 01:22:36 +00007696 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true);
7697 CompLHSTy = CompResultTy;
John Wiegley429bb272011-04-08 18:41:53 +00007698 if (!CompResultTy.isNull() && !lhs.isInvalid() && !rhs.isInvalid())
7699 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007700 break;
John McCall2de56d12010-08-25 11:45:40 +00007701 case BO_AddAssign:
Eli Friedmanab3a8522009-03-28 01:22:36 +00007702 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy);
John Wiegley429bb272011-04-08 18:41:53 +00007703 if (!CompResultTy.isNull() && !lhs.isInvalid() && !rhs.isInvalid())
7704 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007705 break;
John McCall2de56d12010-08-25 11:45:40 +00007706 case BO_SubAssign:
Eli Friedmanab3a8522009-03-28 01:22:36 +00007707 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy);
John Wiegley429bb272011-04-08 18:41:53 +00007708 if (!CompResultTy.isNull() && !lhs.isInvalid() && !rhs.isInvalid())
7709 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007710 break;
John McCall2de56d12010-08-25 11:45:40 +00007711 case BO_ShlAssign:
7712 case BO_ShrAssign:
Chandler Carruth21206d52011-02-23 23:34:11 +00007713 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, Opc, true);
Eli Friedmanab3a8522009-03-28 01:22:36 +00007714 CompLHSTy = CompResultTy;
John Wiegley429bb272011-04-08 18:41:53 +00007715 if (!CompResultTy.isNull() && !lhs.isInvalid() && !rhs.isInvalid())
7716 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007717 break;
John McCall2de56d12010-08-25 11:45:40 +00007718 case BO_AndAssign:
7719 case BO_XorAssign:
7720 case BO_OrAssign:
Eli Friedmanab3a8522009-03-28 01:22:36 +00007721 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true);
7722 CompLHSTy = CompResultTy;
John Wiegley429bb272011-04-08 18:41:53 +00007723 if (!CompResultTy.isNull() && !lhs.isInvalid() && !rhs.isInvalid())
7724 ResultTy = CheckAssignmentOperands(lhs.get(), rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007725 break;
John McCall2de56d12010-08-25 11:45:40 +00007726 case BO_Comma:
John McCall09431682010-11-18 19:01:18 +00007727 ResultTy = CheckCommaOperands(*this, lhs, rhs, OpLoc);
John Wiegley429bb272011-04-08 18:41:53 +00007728 if (getLangOptions().CPlusPlus && !rhs.isInvalid()) {
7729 VK = rhs.get()->getValueKind();
7730 OK = rhs.get()->getObjectKind();
John McCallf89e55a2010-11-18 06:31:45 +00007731 }
Douglas Gregoreaebc752008-11-06 23:29:22 +00007732 break;
7733 }
John Wiegley429bb272011-04-08 18:41:53 +00007734 if (ResultTy.isNull() || lhs.isInvalid() || rhs.isInvalid())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00007735 return ExprError();
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00007736
7737 // Check for array bounds violations for both sides of the BinaryOperator
7738 CheckArrayAccess(lhs.get());
7739 CheckArrayAccess(rhs.get());
7740
Eli Friedmanab3a8522009-03-28 01:22:36 +00007741 if (CompResultTy.isNull())
John Wiegley429bb272011-04-08 18:41:53 +00007742 return Owned(new (Context) BinaryOperator(lhs.take(), rhs.take(), Opc,
7743 ResultTy, VK, OK, OpLoc));
Richard Trieu67e29332011-08-02 04:35:43 +00007744 if (getLangOptions().CPlusPlus && lhs.get()->getObjectKind() !=
7745 OK_ObjCProperty) {
John McCallf89e55a2010-11-18 06:31:45 +00007746 VK = VK_LValue;
John Wiegley429bb272011-04-08 18:41:53 +00007747 OK = lhs.get()->getObjectKind();
John McCallf89e55a2010-11-18 06:31:45 +00007748 }
John Wiegley429bb272011-04-08 18:41:53 +00007749 return Owned(new (Context) CompoundAssignOperator(lhs.take(), rhs.take(), Opc,
7750 ResultTy, VK, OK, CompLHSTy,
John McCallf89e55a2010-11-18 06:31:45 +00007751 CompResultTy, OpLoc));
Douglas Gregoreaebc752008-11-06 23:29:22 +00007752}
7753
Sebastian Redlaee3c932009-10-27 12:10:02 +00007754/// DiagnoseBitwisePrecedence - Emit a warning when bitwise and comparison
7755/// operators are mixed in a way that suggests that the programmer forgot that
7756/// comparison operators have higher precedence. The most typical example of
7757/// such code is "flags & 0x0020 != 0", which is equivalent to "flags & 1".
John McCall2de56d12010-08-25 11:45:40 +00007758static void DiagnoseBitwisePrecedence(Sema &Self, BinaryOperatorKind Opc,
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007759 SourceLocation OpLoc,Expr *lhs,Expr *rhs){
Sebastian Redlaee3c932009-10-27 12:10:02 +00007760 typedef BinaryOperator BinOp;
7761 BinOp::Opcode lhsopc = static_cast<BinOp::Opcode>(-1),
7762 rhsopc = static_cast<BinOp::Opcode>(-1);
7763 if (BinOp *BO = dyn_cast<BinOp>(lhs))
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007764 lhsopc = BO->getOpcode();
Sebastian Redlaee3c932009-10-27 12:10:02 +00007765 if (BinOp *BO = dyn_cast<BinOp>(rhs))
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007766 rhsopc = BO->getOpcode();
7767
7768 // Subs are not binary operators.
7769 if (lhsopc == -1 && rhsopc == -1)
7770 return;
7771
7772 // Bitwise operations are sometimes used as eager logical ops.
7773 // Don't diagnose this.
Sebastian Redlaee3c932009-10-27 12:10:02 +00007774 if ((BinOp::isComparisonOp(lhsopc) || BinOp::isBitwiseOp(lhsopc)) &&
7775 (BinOp::isComparisonOp(rhsopc) || BinOp::isBitwiseOp(rhsopc)))
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007776 return;
7777
Chandler Carruthf0b60d62011-06-16 01:05:14 +00007778 if (BinOp::isComparisonOp(lhsopc)) {
7779 Self.Diag(OpLoc, diag::warn_precedence_bitwise_rel)
7780 << SourceRange(lhs->getLocStart(), OpLoc)
7781 << BinOp::getOpcodeStr(Opc) << BinOp::getOpcodeStr(lhsopc);
Sebastian Redl6b169ac2009-10-26 17:01:32 +00007782 SuggestParentheses(Self, OpLoc,
Douglas Gregor55b38842010-04-14 16:09:52 +00007783 Self.PDiag(diag::note_precedence_bitwise_silence)
7784 << BinOp::getOpcodeStr(lhsopc),
Chandler Carruthf0b60d62011-06-16 01:05:14 +00007785 lhs->getSourceRange());
7786 SuggestParentheses(Self, OpLoc,
Argyrios Kyrtzidisabdd3b32011-04-25 23:01:29 +00007787 Self.PDiag(diag::note_precedence_bitwise_first)
7788 << BinOp::getOpcodeStr(Opc),
7789 SourceRange(cast<BinOp>(lhs)->getRHS()->getLocStart(), rhs->getLocEnd()));
Chandler Carruthf0b60d62011-06-16 01:05:14 +00007790 } else if (BinOp::isComparisonOp(rhsopc)) {
7791 Self.Diag(OpLoc, diag::warn_precedence_bitwise_rel)
7792 << SourceRange(OpLoc, rhs->getLocEnd())
7793 << BinOp::getOpcodeStr(Opc) << BinOp::getOpcodeStr(rhsopc);
Sebastian Redl6b169ac2009-10-26 17:01:32 +00007794 SuggestParentheses(Self, OpLoc,
Argyrios Kyrtzidisabdd3b32011-04-25 23:01:29 +00007795 Self.PDiag(diag::note_precedence_bitwise_silence)
7796 << BinOp::getOpcodeStr(rhsopc),
Chandler Carruthf0b60d62011-06-16 01:05:14 +00007797 rhs->getSourceRange());
7798 SuggestParentheses(Self, OpLoc,
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00007799 Self.PDiag(diag::note_precedence_bitwise_first)
Douglas Gregor827feec2010-01-08 00:20:23 +00007800 << BinOp::getOpcodeStr(Opc),
Douglas Gregorb27c7a12011-06-22 18:41:08 +00007801 SourceRange(lhs->getLocStart(),
7802 cast<BinOp>(rhs)->getLHS()->getLocStart()));
Chandler Carruthf0b60d62011-06-16 01:05:14 +00007803 }
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007804}
7805
Argyrios Kyrtzidis33f46e22011-06-20 18:41:26 +00007806/// \brief It accepts a '&' expr that is inside a '|' one.
7807/// Emit a diagnostic together with a fixit hint that wraps the '&' expression
7808/// in parentheses.
7809static void
7810EmitDiagnosticForBitwiseAndInBitwiseOr(Sema &Self, SourceLocation OpLoc,
7811 BinaryOperator *Bop) {
7812 assert(Bop->getOpcode() == BO_And);
7813 Self.Diag(Bop->getOperatorLoc(), diag::warn_bitwise_and_in_bitwise_or)
7814 << Bop->getSourceRange() << OpLoc;
7815 SuggestParentheses(Self, Bop->getOperatorLoc(),
7816 Self.PDiag(diag::note_bitwise_and_in_bitwise_or_silence),
7817 Bop->getSourceRange());
7818}
7819
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007820/// \brief It accepts a '&&' expr that is inside a '||' one.
7821/// Emit a diagnostic together with a fixit hint that wraps the '&&' expression
7822/// in parentheses.
7823static void
7824EmitDiagnosticForLogicalAndInLogicalOr(Sema &Self, SourceLocation OpLoc,
Argyrios Kyrtzidisa61aedc2011-04-22 19:16:27 +00007825 BinaryOperator *Bop) {
7826 assert(Bop->getOpcode() == BO_LAnd);
Chandler Carruthf0b60d62011-06-16 01:05:14 +00007827 Self.Diag(Bop->getOperatorLoc(), diag::warn_logical_and_in_logical_or)
7828 << Bop->getSourceRange() << OpLoc;
Argyrios Kyrtzidisa61aedc2011-04-22 19:16:27 +00007829 SuggestParentheses(Self, Bop->getOperatorLoc(),
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007830 Self.PDiag(diag::note_logical_and_in_logical_or_silence),
Chandler Carruthf0b60d62011-06-16 01:05:14 +00007831 Bop->getSourceRange());
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007832}
7833
7834/// \brief Returns true if the given expression can be evaluated as a constant
7835/// 'true'.
7836static bool EvaluatesAsTrue(Sema &S, Expr *E) {
7837 bool Res;
7838 return E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && Res;
7839}
7840
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007841/// \brief Returns true if the given expression can be evaluated as a constant
7842/// 'false'.
7843static bool EvaluatesAsFalse(Sema &S, Expr *E) {
7844 bool Res;
7845 return E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && !Res;
7846}
7847
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007848/// \brief Look for '&&' in the left hand of a '||' expr.
7849static void DiagnoseLogicalAndInLogicalOrLHS(Sema &S, SourceLocation OpLoc,
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007850 Expr *OrLHS, Expr *OrRHS) {
7851 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(OrLHS)) {
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007852 if (Bop->getOpcode() == BO_LAnd) {
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007853 // If it's "a && b || 0" don't warn since the precedence doesn't matter.
7854 if (EvaluatesAsFalse(S, OrRHS))
7855 return;
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007856 // If it's "1 && a || b" don't warn since the precedence doesn't matter.
7857 if (!EvaluatesAsTrue(S, Bop->getLHS()))
7858 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
7859 } else if (Bop->getOpcode() == BO_LOr) {
7860 if (BinaryOperator *RBop = dyn_cast<BinaryOperator>(Bop->getRHS())) {
7861 // If it's "a || b && 1 || c" we didn't warn earlier for
7862 // "a || b && 1", but warn now.
7863 if (RBop->getOpcode() == BO_LAnd && EvaluatesAsTrue(S, RBop->getRHS()))
7864 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, RBop);
7865 }
7866 }
7867 }
7868}
7869
7870/// \brief Look for '&&' in the right hand of a '||' expr.
7871static void DiagnoseLogicalAndInLogicalOrRHS(Sema &S, SourceLocation OpLoc,
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007872 Expr *OrLHS, Expr *OrRHS) {
7873 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(OrRHS)) {
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007874 if (Bop->getOpcode() == BO_LAnd) {
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007875 // If it's "0 || a && b" don't warn since the precedence doesn't matter.
7876 if (EvaluatesAsFalse(S, OrLHS))
7877 return;
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007878 // If it's "a || b && 1" don't warn since the precedence doesn't matter.
7879 if (!EvaluatesAsTrue(S, Bop->getRHS()))
7880 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007881 }
7882 }
7883}
7884
Argyrios Kyrtzidis33f46e22011-06-20 18:41:26 +00007885/// \brief Look for '&' in the left or right hand of a '|' expr.
7886static void DiagnoseBitwiseAndInBitwiseOr(Sema &S, SourceLocation OpLoc,
7887 Expr *OrArg) {
7888 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(OrArg)) {
7889 if (Bop->getOpcode() == BO_And)
7890 return EmitDiagnosticForBitwiseAndInBitwiseOr(S, OpLoc, Bop);
7891 }
7892}
7893
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007894/// DiagnoseBinOpPrecedence - Emit warnings for expressions with tricky
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007895/// precedence.
John McCall2de56d12010-08-25 11:45:40 +00007896static void DiagnoseBinOpPrecedence(Sema &Self, BinaryOperatorKind Opc,
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007897 SourceLocation OpLoc, Expr *lhs, Expr *rhs){
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007898 // Diagnose "arg1 'bitwise' arg2 'eq' arg3".
Sebastian Redlaee3c932009-10-27 12:10:02 +00007899 if (BinaryOperator::isBitwiseOp(Opc))
Argyrios Kyrtzidis33f46e22011-06-20 18:41:26 +00007900 DiagnoseBitwisePrecedence(Self, Opc, OpLoc, lhs, rhs);
7901
7902 // Diagnose "arg1 & arg2 | arg3"
7903 if (Opc == BO_Or && !OpLoc.isMacroID()/* Don't warn in macros. */) {
7904 DiagnoseBitwiseAndInBitwiseOr(Self, OpLoc, lhs);
7905 DiagnoseBitwiseAndInBitwiseOr(Self, OpLoc, rhs);
7906 }
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007907
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007908 // Warn about arg1 || arg2 && arg3, as GCC 4.3+ does.
7909 // We don't warn for 'assert(a || b && "bad")' since this is safe.
Argyrios Kyrtzidisd92ccaa2010-11-17 18:54:22 +00007910 if (Opc == BO_LOr && !OpLoc.isMacroID()/* Don't warn in macros. */) {
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007911 DiagnoseLogicalAndInLogicalOrLHS(Self, OpLoc, lhs, rhs);
7912 DiagnoseLogicalAndInLogicalOrRHS(Self, OpLoc, lhs, rhs);
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007913 }
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007914}
7915
Reid Spencer5f016e22007-07-11 17:01:13 +00007916// Binary Operators. 'Tok' is the token for the operator.
John McCall60d7b3a2010-08-24 06:29:42 +00007917ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc,
John McCall2de56d12010-08-25 11:45:40 +00007918 tok::TokenKind Kind,
7919 Expr *lhs, Expr *rhs) {
7920 BinaryOperatorKind Opc = ConvertTokenKindToBinaryOpcode(Kind);
Steve Narofff69936d2007-09-16 03:34:24 +00007921 assert((lhs != 0) && "ActOnBinOp(): missing left expression");
7922 assert((rhs != 0) && "ActOnBinOp(): missing right expression");
Reid Spencer5f016e22007-07-11 17:01:13 +00007923
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007924 // Emit warnings for tricky precedence issues, e.g. "bitfield & 0x4 == 0"
7925 DiagnoseBinOpPrecedence(*this, Opc, TokLoc, lhs, rhs);
7926
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00007927 return BuildBinOp(S, TokLoc, Opc, lhs, rhs);
7928}
7929
John McCall60d7b3a2010-08-24 06:29:42 +00007930ExprResult Sema::BuildBinOp(Scope *S, SourceLocation OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00007931 BinaryOperatorKind Opc,
7932 Expr *lhs, Expr *rhs) {
John McCall01b2e4e2010-12-06 05:26:58 +00007933 if (getLangOptions().CPlusPlus) {
7934 bool UseBuiltinOperator;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007935
John McCall01b2e4e2010-12-06 05:26:58 +00007936 if (lhs->isTypeDependent() || rhs->isTypeDependent()) {
7937 UseBuiltinOperator = false;
7938 } else if (Opc == BO_Assign && lhs->getObjectKind() == OK_ObjCProperty) {
7939 UseBuiltinOperator = true;
7940 } else {
7941 UseBuiltinOperator = !lhs->getType()->isOverloadableType() &&
7942 !rhs->getType()->isOverloadableType();
7943 }
7944
7945 if (!UseBuiltinOperator) {
7946 // Find all of the overloaded operators visible from this
7947 // point. We perform both an operator-name lookup from the local
7948 // scope and an argument-dependent lookup based on the types of
7949 // the arguments.
7950 UnresolvedSet<16> Functions;
7951 OverloadedOperatorKind OverOp
7952 = BinaryOperator::getOverloadedOperator(Opc);
7953 if (S && OverOp != OO_None)
7954 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(),
7955 Functions);
7956
7957 // Build the (potentially-overloaded, potentially-dependent)
7958 // binary operation.
7959 return CreateOverloadedBinOp(OpLoc, Opc, Functions, lhs, rhs);
7960 }
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00007961 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007962
Douglas Gregoreaebc752008-11-06 23:29:22 +00007963 // Build a built-in binary operation.
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00007964 return CreateBuiltinBinOp(OpLoc, Opc, lhs, rhs);
Reid Spencer5f016e22007-07-11 17:01:13 +00007965}
7966
John McCall60d7b3a2010-08-24 06:29:42 +00007967ExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc,
Argyrios Kyrtzidisb1fa3dc2011-01-05 20:09:36 +00007968 UnaryOperatorKind Opc,
John Wiegley429bb272011-04-08 18:41:53 +00007969 Expr *InputExpr) {
7970 ExprResult Input = Owned(InputExpr);
John McCallf89e55a2010-11-18 06:31:45 +00007971 ExprValueKind VK = VK_RValue;
7972 ExprObjectKind OK = OK_Ordinary;
Reid Spencer5f016e22007-07-11 17:01:13 +00007973 QualType resultType;
7974 switch (Opc) {
John McCall2de56d12010-08-25 11:45:40 +00007975 case UO_PreInc:
7976 case UO_PreDec:
7977 case UO_PostInc:
7978 case UO_PostDec:
John Wiegley429bb272011-04-08 18:41:53 +00007979 resultType = CheckIncrementDecrementOperand(*this, Input.get(), VK, OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00007980 Opc == UO_PreInc ||
7981 Opc == UO_PostInc,
7982 Opc == UO_PreInc ||
7983 Opc == UO_PreDec);
Reid Spencer5f016e22007-07-11 17:01:13 +00007984 break;
John McCall2de56d12010-08-25 11:45:40 +00007985 case UO_AddrOf:
John Wiegley429bb272011-04-08 18:41:53 +00007986 resultType = CheckAddressOfOperand(*this, Input.get(), OpLoc);
Reid Spencer5f016e22007-07-11 17:01:13 +00007987 break;
John McCall1de4d4e2011-04-07 08:22:57 +00007988 case UO_Deref: {
John McCallfb8721c2011-04-10 19:13:55 +00007989 ExprResult resolved = CheckPlaceholderExpr(Input.get());
John McCall1de4d4e2011-04-07 08:22:57 +00007990 if (!resolved.isUsable()) return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00007991 Input = move(resolved);
7992 Input = DefaultFunctionArrayLvalueConversion(Input.take());
7993 resultType = CheckIndirectionOperand(*this, Input.get(), VK, OpLoc);
Reid Spencer5f016e22007-07-11 17:01:13 +00007994 break;
John McCall1de4d4e2011-04-07 08:22:57 +00007995 }
John McCall2de56d12010-08-25 11:45:40 +00007996 case UO_Plus:
7997 case UO_Minus:
John Wiegley429bb272011-04-08 18:41:53 +00007998 Input = UsualUnaryConversions(Input.take());
7999 if (Input.isInvalid()) return ExprError();
8000 resultType = Input.get()->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00008001 if (resultType->isDependentType())
8002 break;
Douglas Gregor00619622010-06-22 23:41:02 +00008003 if (resultType->isArithmeticType() || // C99 6.5.3.3p1
8004 resultType->isVectorType())
Douglas Gregor74253732008-11-19 15:42:04 +00008005 break;
8006 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7
8007 resultType->isEnumeralType())
8008 break;
8009 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6
John McCall2de56d12010-08-25 11:45:40 +00008010 Opc == UO_Plus &&
Douglas Gregor74253732008-11-19 15:42:04 +00008011 resultType->isPointerType())
8012 break;
John McCall2cd11fe2010-10-12 02:09:17 +00008013 else if (resultType->isPlaceholderType()) {
John McCallfb8721c2011-04-10 19:13:55 +00008014 Input = CheckPlaceholderExpr(Input.take());
John Wiegley429bb272011-04-08 18:41:53 +00008015 if (Input.isInvalid()) return ExprError();
8016 return CreateBuiltinUnaryOp(OpLoc, Opc, Input.take());
John McCall2cd11fe2010-10-12 02:09:17 +00008017 }
Douglas Gregor74253732008-11-19 15:42:04 +00008018
Sebastian Redl0eb23302009-01-19 00:08:26 +00008019 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
John Wiegley429bb272011-04-08 18:41:53 +00008020 << resultType << Input.get()->getSourceRange());
8021
John McCall2de56d12010-08-25 11:45:40 +00008022 case UO_Not: // bitwise complement
John Wiegley429bb272011-04-08 18:41:53 +00008023 Input = UsualUnaryConversions(Input.take());
8024 if (Input.isInvalid()) return ExprError();
8025 resultType = Input.get()->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00008026 if (resultType->isDependentType())
8027 break;
Chris Lattner02a65142008-07-25 23:52:49 +00008028 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension.
8029 if (resultType->isComplexType() || resultType->isComplexIntegerType())
8030 // C99 does not support '~' for complex conjugation.
Chris Lattnerd3a94e22008-11-20 06:06:08 +00008031 Diag(OpLoc, diag::ext_integer_complement_complex)
John Wiegley429bb272011-04-08 18:41:53 +00008032 << resultType << Input.get()->getSourceRange();
John McCall2cd11fe2010-10-12 02:09:17 +00008033 else if (resultType->hasIntegerRepresentation())
8034 break;
8035 else if (resultType->isPlaceholderType()) {
John McCallfb8721c2011-04-10 19:13:55 +00008036 Input = CheckPlaceholderExpr(Input.take());
John Wiegley429bb272011-04-08 18:41:53 +00008037 if (Input.isInvalid()) return ExprError();
8038 return CreateBuiltinUnaryOp(OpLoc, Opc, Input.take());
John McCall2cd11fe2010-10-12 02:09:17 +00008039 } else {
Sebastian Redl0eb23302009-01-19 00:08:26 +00008040 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
John Wiegley429bb272011-04-08 18:41:53 +00008041 << resultType << Input.get()->getSourceRange());
John McCall2cd11fe2010-10-12 02:09:17 +00008042 }
Reid Spencer5f016e22007-07-11 17:01:13 +00008043 break;
John Wiegley429bb272011-04-08 18:41:53 +00008044
John McCall2de56d12010-08-25 11:45:40 +00008045 case UO_LNot: // logical negation
Reid Spencer5f016e22007-07-11 17:01:13 +00008046 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5).
John Wiegley429bb272011-04-08 18:41:53 +00008047 Input = DefaultFunctionArrayLvalueConversion(Input.take());
8048 if (Input.isInvalid()) return ExprError();
8049 resultType = Input.get()->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00008050 if (resultType->isDependentType())
8051 break;
Abramo Bagnara737d5442011-04-07 09:26:19 +00008052 if (resultType->isScalarType()) {
8053 // C99 6.5.3.3p1: ok, fallthrough;
8054 if (Context.getLangOptions().CPlusPlus) {
8055 // C++03 [expr.unary.op]p8, C++0x [expr.unary.op]p9:
8056 // operand contextually converted to bool.
John Wiegley429bb272011-04-08 18:41:53 +00008057 Input = ImpCastExprToType(Input.take(), Context.BoolTy,
8058 ScalarTypeToBooleanCastKind(resultType));
Abramo Bagnara737d5442011-04-07 09:26:19 +00008059 }
John McCall2cd11fe2010-10-12 02:09:17 +00008060 } else if (resultType->isPlaceholderType()) {
John McCallfb8721c2011-04-10 19:13:55 +00008061 Input = CheckPlaceholderExpr(Input.take());
John Wiegley429bb272011-04-08 18:41:53 +00008062 if (Input.isInvalid()) return ExprError();
8063 return CreateBuiltinUnaryOp(OpLoc, Opc, Input.take());
John McCall2cd11fe2010-10-12 02:09:17 +00008064 } else {
Sebastian Redl0eb23302009-01-19 00:08:26 +00008065 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
John Wiegley429bb272011-04-08 18:41:53 +00008066 << resultType << Input.get()->getSourceRange());
John McCall2cd11fe2010-10-12 02:09:17 +00008067 }
Douglas Gregorea844f32010-09-20 17:13:33 +00008068
Reid Spencer5f016e22007-07-11 17:01:13 +00008069 // LNot always has type int. C99 6.5.3.3p5.
Sebastian Redl0eb23302009-01-19 00:08:26 +00008070 // In C++, it's bool. C++ 5.3.1p8
Argyrios Kyrtzidis16f744b2011-02-18 20:55:15 +00008071 resultType = Context.getLogicalOperationType();
Reid Spencer5f016e22007-07-11 17:01:13 +00008072 break;
John McCall2de56d12010-08-25 11:45:40 +00008073 case UO_Real:
8074 case UO_Imag:
John McCall09431682010-11-18 19:01:18 +00008075 resultType = CheckRealImagOperand(*this, Input, OpLoc, Opc == UO_Real);
John McCallf89e55a2010-11-18 06:31:45 +00008076 // _Real and _Imag map ordinary l-values into ordinary l-values.
John Wiegley429bb272011-04-08 18:41:53 +00008077 if (Input.isInvalid()) return ExprError();
8078 if (Input.get()->getValueKind() != VK_RValue &&
8079 Input.get()->getObjectKind() == OK_Ordinary)
8080 VK = Input.get()->getValueKind();
Chris Lattnerdbb36972007-08-24 21:16:53 +00008081 break;
John McCall2de56d12010-08-25 11:45:40 +00008082 case UO_Extension:
John Wiegley429bb272011-04-08 18:41:53 +00008083 resultType = Input.get()->getType();
8084 VK = Input.get()->getValueKind();
8085 OK = Input.get()->getObjectKind();
Reid Spencer5f016e22007-07-11 17:01:13 +00008086 break;
8087 }
John Wiegley429bb272011-04-08 18:41:53 +00008088 if (resultType.isNull() || Input.isInvalid())
Sebastian Redl0eb23302009-01-19 00:08:26 +00008089 return ExprError();
Douglas Gregorbc736fc2009-03-13 23:49:33 +00008090
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00008091 // Check for array bounds violations in the operand of the UnaryOperator,
8092 // except for the '*' and '&' operators that have to be handled specially
8093 // by CheckArrayAccess (as there are special cases like &array[arraysize]
8094 // that are explicitly defined as valid by the standard).
8095 if (Opc != UO_AddrOf && Opc != UO_Deref)
8096 CheckArrayAccess(Input.get());
8097
John Wiegley429bb272011-04-08 18:41:53 +00008098 return Owned(new (Context) UnaryOperator(Input.take(), Opc, resultType,
John McCallf89e55a2010-11-18 06:31:45 +00008099 VK, OK, OpLoc));
Reid Spencer5f016e22007-07-11 17:01:13 +00008100}
8101
John McCall60d7b3a2010-08-24 06:29:42 +00008102ExprResult Sema::BuildUnaryOp(Scope *S, SourceLocation OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00008103 UnaryOperatorKind Opc,
8104 Expr *Input) {
Anders Carlssona8a1e3d2009-11-14 21:26:41 +00008105 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType() &&
Eli Friedman957c0942010-09-05 23:15:52 +00008106 UnaryOperator::getOverloadedOperator(Opc) != OO_None) {
Douglas Gregorbc736fc2009-03-13 23:49:33 +00008107 // Find all of the overloaded operators visible from this
8108 // point. We perform both an operator-name lookup from the local
8109 // scope and an argument-dependent lookup based on the types of
8110 // the arguments.
John McCall6e266892010-01-26 03:27:55 +00008111 UnresolvedSet<16> Functions;
Douglas Gregorbc736fc2009-03-13 23:49:33 +00008112 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc);
John McCall6e266892010-01-26 03:27:55 +00008113 if (S && OverOp != OO_None)
8114 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(),
8115 Functions);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008116
John McCall9ae2f072010-08-23 23:25:46 +00008117 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, Input);
Douglas Gregorbc736fc2009-03-13 23:49:33 +00008118 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008119
John McCall9ae2f072010-08-23 23:25:46 +00008120 return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
Douglas Gregorbc736fc2009-03-13 23:49:33 +00008121}
8122
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00008123// Unary Operators. 'Tok' is the token for the operator.
John McCall60d7b3a2010-08-24 06:29:42 +00008124ExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc,
John McCallf4c73712011-01-19 06:33:43 +00008125 tok::TokenKind Op, Expr *Input) {
John McCall9ae2f072010-08-23 23:25:46 +00008126 return BuildUnaryOp(S, OpLoc, ConvertTokenKindToUnaryOpcode(Op), Input);
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00008127}
8128
Steve Naroff1b273c42007-09-16 14:56:35 +00008129/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo".
Chris Lattnerad8dcf42011-02-17 07:39:24 +00008130ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, SourceLocation LabLoc,
Chris Lattner57ad3782011-02-17 20:34:02 +00008131 LabelDecl *TheDecl) {
Chris Lattnerad8dcf42011-02-17 07:39:24 +00008132 TheDecl->setUsed();
Reid Spencer5f016e22007-07-11 17:01:13 +00008133 // Create the AST node. The address of a label always has type 'void*'.
Chris Lattnerad8dcf42011-02-17 07:39:24 +00008134 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, TheDecl,
Sebastian Redlf53597f2009-03-15 17:47:39 +00008135 Context.getPointerType(Context.VoidTy)));
Reid Spencer5f016e22007-07-11 17:01:13 +00008136}
8137
John McCallf85e1932011-06-15 23:02:42 +00008138/// Given the last statement in a statement-expression, check whether
8139/// the result is a producing expression (like a call to an
8140/// ns_returns_retained function) and, if so, rebuild it to hoist the
8141/// release out of the full-expression. Otherwise, return null.
8142/// Cannot fail.
8143static Expr *maybeRebuildARCConsumingStmt(Stmt *s) {
8144 // Should always be wrapped with one of these.
8145 ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(s);
8146 if (!cleanups) return 0;
8147
8148 ImplicitCastExpr *cast = dyn_cast<ImplicitCastExpr>(cleanups->getSubExpr());
8149 if (!cast || cast->getCastKind() != CK_ObjCConsumeObject)
8150 return 0;
8151
8152 // Splice out the cast. This shouldn't modify any interesting
8153 // features of the statement.
8154 Expr *producer = cast->getSubExpr();
8155 assert(producer->getType() == cast->getType());
8156 assert(producer->getValueKind() == cast->getValueKind());
8157 cleanups->setSubExpr(producer);
8158 return cleanups;
8159}
8160
John McCall60d7b3a2010-08-24 06:29:42 +00008161ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00008162Sema::ActOnStmtExpr(SourceLocation LPLoc, Stmt *SubStmt,
Sebastian Redlf53597f2009-03-15 17:47:39 +00008163 SourceLocation RPLoc) { // "({..})"
Chris Lattnerab18c4c2007-07-24 16:58:17 +00008164 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!");
8165 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt);
8166
Douglas Gregordd8f5692010-03-10 04:54:39 +00008167 bool isFileScope
8168 = (getCurFunctionOrMethodDecl() == 0) && (getCurBlock() == 0);
Chris Lattner4a049f02009-04-25 19:11:05 +00008169 if (isFileScope)
Sebastian Redlf53597f2009-03-15 17:47:39 +00008170 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope));
Eli Friedmandca2b732009-01-24 23:09:00 +00008171
Chris Lattnerab18c4c2007-07-24 16:58:17 +00008172 // FIXME: there are a variety of strange constraints to enforce here, for
8173 // example, it is not possible to goto into a stmt expression apparently.
8174 // More semantic analysis is needed.
Mike Stumpeed9cac2009-02-19 03:04:26 +00008175
Chris Lattnerab18c4c2007-07-24 16:58:17 +00008176 // If there are sub stmts in the compound stmt, take the type of the last one
8177 // as the type of the stmtexpr.
8178 QualType Ty = Context.VoidTy;
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008179 bool StmtExprMayBindToTemp = false;
Chris Lattner611b2ec2008-07-26 19:51:01 +00008180 if (!Compound->body_empty()) {
8181 Stmt *LastStmt = Compound->body_back();
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008182 LabelStmt *LastLabelStmt = 0;
Chris Lattner611b2ec2008-07-26 19:51:01 +00008183 // If LastStmt is a label, skip down through into the body.
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008184 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) {
8185 LastLabelStmt = Label;
Chris Lattner611b2ec2008-07-26 19:51:01 +00008186 LastStmt = Label->getSubStmt();
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008187 }
John McCallf85e1932011-06-15 23:02:42 +00008188
John Wiegley429bb272011-04-08 18:41:53 +00008189 if (Expr *LastE = dyn_cast<Expr>(LastStmt)) {
John McCallf6a16482010-12-04 03:47:34 +00008190 // Do function/array conversion on the last expression, but not
8191 // lvalue-to-rvalue. However, initialize an unqualified type.
John Wiegley429bb272011-04-08 18:41:53 +00008192 ExprResult LastExpr = DefaultFunctionArrayConversion(LastE);
8193 if (LastExpr.isInvalid())
8194 return ExprError();
8195 Ty = LastExpr.get()->getType().getUnqualifiedType();
John McCallf6a16482010-12-04 03:47:34 +00008196
John Wiegley429bb272011-04-08 18:41:53 +00008197 if (!Ty->isDependentType() && !LastExpr.get()->isTypeDependent()) {
John McCallf85e1932011-06-15 23:02:42 +00008198 // In ARC, if the final expression ends in a consume, splice
8199 // the consume out and bind it later. In the alternate case
8200 // (when dealing with a retainable type), the result
8201 // initialization will create a produce. In both cases the
8202 // result will be +1, and we'll need to balance that out with
8203 // a bind.
8204 if (Expr *rebuiltLastStmt
8205 = maybeRebuildARCConsumingStmt(LastExpr.get())) {
8206 LastExpr = rebuiltLastStmt;
8207 } else {
8208 LastExpr = PerformCopyInitialization(
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008209 InitializedEntity::InitializeResult(LPLoc,
8210 Ty,
8211 false),
8212 SourceLocation(),
John McCallf85e1932011-06-15 23:02:42 +00008213 LastExpr);
8214 }
8215
John Wiegley429bb272011-04-08 18:41:53 +00008216 if (LastExpr.isInvalid())
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008217 return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00008218 if (LastExpr.get() != 0) {
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008219 if (!LastLabelStmt)
John Wiegley429bb272011-04-08 18:41:53 +00008220 Compound->setLastStmt(LastExpr.take());
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008221 else
John Wiegley429bb272011-04-08 18:41:53 +00008222 LastLabelStmt->setSubStmt(LastExpr.take());
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008223 StmtExprMayBindToTemp = true;
8224 }
8225 }
8226 }
Chris Lattner611b2ec2008-07-26 19:51:01 +00008227 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008228
Eli Friedmanb1d796d2009-03-23 00:24:07 +00008229 // FIXME: Check that expression type is complete/non-abstract; statement
8230 // expressions are not lvalues.
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008231 Expr *ResStmtExpr = new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc);
8232 if (StmtExprMayBindToTemp)
8233 return MaybeBindToTemporary(ResStmtExpr);
8234 return Owned(ResStmtExpr);
Chris Lattnerab18c4c2007-07-24 16:58:17 +00008235}
Steve Naroffd34e9152007-08-01 22:05:33 +00008236
John McCall60d7b3a2010-08-24 06:29:42 +00008237ExprResult Sema::BuildBuiltinOffsetOf(SourceLocation BuiltinLoc,
John McCall2cd11fe2010-10-12 02:09:17 +00008238 TypeSourceInfo *TInfo,
8239 OffsetOfComponent *CompPtr,
8240 unsigned NumComponents,
8241 SourceLocation RParenLoc) {
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008242 QualType ArgTy = TInfo->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00008243 bool Dependent = ArgTy->isDependentType();
Abramo Bagnarabd054db2010-05-20 10:00:11 +00008244 SourceRange TypeRange = TInfo->getTypeLoc().getLocalSourceRange();
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008245
Chris Lattner73d0d4f2007-08-30 17:45:32 +00008246 // We must have at least one component that refers to the type, and the first
8247 // one is known to be a field designator. Verify that the ArgTy represents
8248 // a struct/union/class.
Sebastian Redl28507842009-02-26 14:39:58 +00008249 if (!Dependent && !ArgTy->isRecordType())
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008250 return ExprError(Diag(BuiltinLoc, diag::err_offsetof_record_type)
8251 << ArgTy << TypeRange);
8252
8253 // Type must be complete per C99 7.17p3 because a declaring a variable
8254 // with an incomplete type would be ill-formed.
8255 if (!Dependent
8256 && RequireCompleteType(BuiltinLoc, ArgTy,
8257 PDiag(diag::err_offsetof_incomplete_type)
8258 << TypeRange))
8259 return ExprError();
8260
Chris Lattner9e2b75c2007-08-31 21:49:13 +00008261 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a
8262 // GCC extension, diagnose them.
Eli Friedman35183ac2009-02-27 06:44:11 +00008263 // FIXME: This diagnostic isn't actually visible because the location is in
8264 // a system header!
Chris Lattner9e2b75c2007-08-31 21:49:13 +00008265 if (NumComponents != 1)
Chris Lattnerdcd5ef12008-11-19 05:27:50 +00008266 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator)
8267 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd);
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008268
8269 bool DidWarnAboutNonPOD = false;
8270 QualType CurrentType = ArgTy;
8271 typedef OffsetOfExpr::OffsetOfNode OffsetOfNode;
Chris Lattner5f9e2722011-07-23 10:55:15 +00008272 SmallVector<OffsetOfNode, 4> Comps;
8273 SmallVector<Expr*, 4> Exprs;
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008274 for (unsigned i = 0; i != NumComponents; ++i) {
8275 const OffsetOfComponent &OC = CompPtr[i];
8276 if (OC.isBrackets) {
8277 // Offset of an array sub-field. TODO: Should we allow vector elements?
8278 if (!CurrentType->isDependentType()) {
8279 const ArrayType *AT = Context.getAsArrayType(CurrentType);
8280 if(!AT)
8281 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type)
8282 << CurrentType);
8283 CurrentType = AT->getElementType();
8284 } else
8285 CurrentType = Context.DependentTy;
8286
8287 // The expression must be an integral expression.
8288 // FIXME: An integral constant expression?
8289 Expr *Idx = static_cast<Expr*>(OC.U.E);
8290 if (!Idx->isTypeDependent() && !Idx->isValueDependent() &&
8291 !Idx->getType()->isIntegerType())
8292 return ExprError(Diag(Idx->getLocStart(),
8293 diag::err_typecheck_subscript_not_integer)
8294 << Idx->getSourceRange());
8295
8296 // Record this array index.
8297 Comps.push_back(OffsetOfNode(OC.LocStart, Exprs.size(), OC.LocEnd));
8298 Exprs.push_back(Idx);
8299 continue;
8300 }
8301
8302 // Offset of a field.
8303 if (CurrentType->isDependentType()) {
8304 // We have the offset of a field, but we can't look into the dependent
8305 // type. Just record the identifier of the field.
8306 Comps.push_back(OffsetOfNode(OC.LocStart, OC.U.IdentInfo, OC.LocEnd));
8307 CurrentType = Context.DependentTy;
8308 continue;
8309 }
8310
8311 // We need to have a complete type to look into.
8312 if (RequireCompleteType(OC.LocStart, CurrentType,
8313 diag::err_offsetof_incomplete_type))
8314 return ExprError();
8315
8316 // Look for the designated field.
8317 const RecordType *RC = CurrentType->getAs<RecordType>();
8318 if (!RC)
8319 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type)
8320 << CurrentType);
8321 RecordDecl *RD = RC->getDecl();
8322
8323 // C++ [lib.support.types]p5:
8324 // The macro offsetof accepts a restricted set of type arguments in this
8325 // International Standard. type shall be a POD structure or a POD union
8326 // (clause 9).
8327 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
8328 if (!CRD->isPOD() && !DidWarnAboutNonPOD &&
Ted Kremenek762696f2011-02-23 01:51:43 +00008329 DiagRuntimeBehavior(BuiltinLoc, 0,
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008330 PDiag(diag::warn_offsetof_non_pod_type)
8331 << SourceRange(CompPtr[0].LocStart, OC.LocEnd)
8332 << CurrentType))
8333 DidWarnAboutNonPOD = true;
8334 }
8335
8336 // Look for the field.
8337 LookupResult R(*this, OC.U.IdentInfo, OC.LocStart, LookupMemberName);
8338 LookupQualifiedName(R, RD);
8339 FieldDecl *MemberDecl = R.getAsSingle<FieldDecl>();
Francois Pichet87c2e122010-11-21 06:08:52 +00008340 IndirectFieldDecl *IndirectMemberDecl = 0;
8341 if (!MemberDecl) {
Benjamin Kramerd9811462010-11-21 14:11:41 +00008342 if ((IndirectMemberDecl = R.getAsSingle<IndirectFieldDecl>()))
Francois Pichet87c2e122010-11-21 06:08:52 +00008343 MemberDecl = IndirectMemberDecl->getAnonField();
8344 }
8345
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008346 if (!MemberDecl)
8347 return ExprError(Diag(BuiltinLoc, diag::err_no_member)
8348 << OC.U.IdentInfo << RD << SourceRange(OC.LocStart,
8349 OC.LocEnd));
8350
Douglas Gregor9d5d60f2010-04-28 22:36:06 +00008351 // C99 7.17p3:
8352 // (If the specified member is a bit-field, the behavior is undefined.)
8353 //
8354 // We diagnose this as an error.
8355 if (MemberDecl->getBitWidth()) {
8356 Diag(OC.LocEnd, diag::err_offsetof_bitfield)
8357 << MemberDecl->getDeclName()
8358 << SourceRange(BuiltinLoc, RParenLoc);
8359 Diag(MemberDecl->getLocation(), diag::note_bitfield_decl);
8360 return ExprError();
8361 }
Eli Friedman19410a72010-08-05 10:11:36 +00008362
8363 RecordDecl *Parent = MemberDecl->getParent();
Francois Pichet87c2e122010-11-21 06:08:52 +00008364 if (IndirectMemberDecl)
8365 Parent = cast<RecordDecl>(IndirectMemberDecl->getDeclContext());
Eli Friedman19410a72010-08-05 10:11:36 +00008366
Douglas Gregorcc8a5d52010-04-29 00:18:15 +00008367 // If the member was found in a base class, introduce OffsetOfNodes for
8368 // the base class indirections.
8369 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
8370 /*DetectVirtual=*/false);
Eli Friedman19410a72010-08-05 10:11:36 +00008371 if (IsDerivedFrom(CurrentType, Context.getTypeDeclType(Parent), Paths)) {
Douglas Gregorcc8a5d52010-04-29 00:18:15 +00008372 CXXBasePath &Path = Paths.front();
8373 for (CXXBasePath::iterator B = Path.begin(), BEnd = Path.end();
8374 B != BEnd; ++B)
8375 Comps.push_back(OffsetOfNode(B->Base));
8376 }
Eli Friedman19410a72010-08-05 10:11:36 +00008377
Francois Pichet87c2e122010-11-21 06:08:52 +00008378 if (IndirectMemberDecl) {
8379 for (IndirectFieldDecl::chain_iterator FI =
8380 IndirectMemberDecl->chain_begin(),
8381 FEnd = IndirectMemberDecl->chain_end(); FI != FEnd; FI++) {
8382 assert(isa<FieldDecl>(*FI));
8383 Comps.push_back(OffsetOfNode(OC.LocStart,
8384 cast<FieldDecl>(*FI), OC.LocEnd));
8385 }
8386 } else
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008387 Comps.push_back(OffsetOfNode(OC.LocStart, MemberDecl, OC.LocEnd));
Francois Pichet87c2e122010-11-21 06:08:52 +00008388
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008389 CurrentType = MemberDecl->getType().getNonReferenceType();
8390 }
8391
8392 return Owned(OffsetOfExpr::Create(Context, Context.getSizeType(), BuiltinLoc,
8393 TInfo, Comps.data(), Comps.size(),
8394 Exprs.data(), Exprs.size(), RParenLoc));
8395}
Mike Stumpeed9cac2009-02-19 03:04:26 +00008396
John McCall60d7b3a2010-08-24 06:29:42 +00008397ExprResult Sema::ActOnBuiltinOffsetOf(Scope *S,
John McCall2cd11fe2010-10-12 02:09:17 +00008398 SourceLocation BuiltinLoc,
8399 SourceLocation TypeLoc,
8400 ParsedType argty,
8401 OffsetOfComponent *CompPtr,
8402 unsigned NumComponents,
8403 SourceLocation RPLoc) {
8404
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008405 TypeSourceInfo *ArgTInfo;
8406 QualType ArgTy = GetTypeFromParser(argty, &ArgTInfo);
8407 if (ArgTy.isNull())
8408 return ExprError();
8409
Eli Friedman5a15dc12010-08-05 10:15:45 +00008410 if (!ArgTInfo)
8411 ArgTInfo = Context.getTrivialTypeSourceInfo(ArgTy, TypeLoc);
8412
8413 return BuildBuiltinOffsetOf(BuiltinLoc, ArgTInfo, CompPtr, NumComponents,
8414 RPLoc);
Chris Lattner73d0d4f2007-08-30 17:45:32 +00008415}
8416
8417
John McCall60d7b3a2010-08-24 06:29:42 +00008418ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc,
John McCall2cd11fe2010-10-12 02:09:17 +00008419 Expr *CondExpr,
8420 Expr *LHSExpr, Expr *RHSExpr,
8421 SourceLocation RPLoc) {
Steve Naroffd04fdd52007-08-03 21:21:27 +00008422 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)");
8423
John McCallf89e55a2010-11-18 06:31:45 +00008424 ExprValueKind VK = VK_RValue;
8425 ExprObjectKind OK = OK_Ordinary;
Sebastian Redl28507842009-02-26 14:39:58 +00008426 QualType resType;
Douglas Gregorce940492009-09-25 04:25:58 +00008427 bool ValueDependent = false;
Douglas Gregorc9ecc572009-05-19 22:43:30 +00008428 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) {
Sebastian Redl28507842009-02-26 14:39:58 +00008429 resType = Context.DependentTy;
Douglas Gregorce940492009-09-25 04:25:58 +00008430 ValueDependent = true;
Sebastian Redl28507842009-02-26 14:39:58 +00008431 } else {
8432 // The conditional expression is required to be a constant expression.
8433 llvm::APSInt condEval(32);
8434 SourceLocation ExpLoc;
8435 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc))
Sebastian Redlf53597f2009-03-15 17:47:39 +00008436 return ExprError(Diag(ExpLoc,
8437 diag::err_typecheck_choose_expr_requires_constant)
8438 << CondExpr->getSourceRange());
Steve Naroffd04fdd52007-08-03 21:21:27 +00008439
Sebastian Redl28507842009-02-26 14:39:58 +00008440 // If the condition is > zero, then the AST type is the same as the LSHExpr.
John McCallf89e55a2010-11-18 06:31:45 +00008441 Expr *ActiveExpr = condEval.getZExtValue() ? LHSExpr : RHSExpr;
8442
8443 resType = ActiveExpr->getType();
8444 ValueDependent = ActiveExpr->isValueDependent();
8445 VK = ActiveExpr->getValueKind();
8446 OK = ActiveExpr->getObjectKind();
Sebastian Redl28507842009-02-26 14:39:58 +00008447 }
8448
Sebastian Redlf53597f2009-03-15 17:47:39 +00008449 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr,
John McCallf89e55a2010-11-18 06:31:45 +00008450 resType, VK, OK, RPLoc,
Douglas Gregorce940492009-09-25 04:25:58 +00008451 resType->isDependentType(),
8452 ValueDependent));
Steve Naroffd04fdd52007-08-03 21:21:27 +00008453}
8454
Steve Naroff4eb206b2008-09-03 18:15:37 +00008455//===----------------------------------------------------------------------===//
8456// Clang Extensions.
8457//===----------------------------------------------------------------------===//
8458
8459/// ActOnBlockStart - This callback is invoked when a block literal is started.
Steve Naroff090276f2008-10-10 01:28:17 +00008460void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) {
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008461 BlockDecl *Block = BlockDecl::Create(Context, CurContext, CaretLoc);
8462 PushBlockScope(BlockScope, Block);
8463 CurContext->addDecl(Block);
Fariborz Jahaniana729da22010-07-09 18:44:02 +00008464 if (BlockScope)
8465 PushDeclContext(BlockScope, Block);
8466 else
8467 CurContext = Block;
Steve Naroff090276f2008-10-10 01:28:17 +00008468}
8469
Mike Stump98eb8a72009-02-04 22:31:32 +00008470void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) {
Mike Stumpaf199f32009-05-07 18:43:07 +00008471 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!");
John McCall711c52b2011-01-05 12:14:39 +00008472 assert(ParamInfo.getContext() == Declarator::BlockLiteralContext);
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008473 BlockScopeInfo *CurBlock = getCurBlock();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008474
John McCallbf1a0282010-06-04 23:28:52 +00008475 TypeSourceInfo *Sig = GetTypeForDeclarator(ParamInfo, CurScope);
John McCallbf1a0282010-06-04 23:28:52 +00008476 QualType T = Sig->getType();
Mike Stump98eb8a72009-02-04 22:31:32 +00008477
John McCall711c52b2011-01-05 12:14:39 +00008478 // GetTypeForDeclarator always produces a function type for a block
8479 // literal signature. Furthermore, it is always a FunctionProtoType
8480 // unless the function was written with a typedef.
8481 assert(T->isFunctionType() &&
8482 "GetTypeForDeclarator made a non-function block signature");
8483
8484 // Look for an explicit signature in that function type.
8485 FunctionProtoTypeLoc ExplicitSignature;
8486
8487 TypeLoc tmp = Sig->getTypeLoc().IgnoreParens();
8488 if (isa<FunctionProtoTypeLoc>(tmp)) {
8489 ExplicitSignature = cast<FunctionProtoTypeLoc>(tmp);
8490
8491 // Check whether that explicit signature was synthesized by
8492 // GetTypeForDeclarator. If so, don't save that as part of the
8493 // written signature.
Abramo Bagnara796aa442011-03-12 11:17:06 +00008494 if (ExplicitSignature.getLocalRangeBegin() ==
8495 ExplicitSignature.getLocalRangeEnd()) {
John McCall711c52b2011-01-05 12:14:39 +00008496 // This would be much cheaper if we stored TypeLocs instead of
8497 // TypeSourceInfos.
8498 TypeLoc Result = ExplicitSignature.getResultLoc();
8499 unsigned Size = Result.getFullDataSize();
8500 Sig = Context.CreateTypeSourceInfo(Result.getType(), Size);
8501 Sig->getTypeLoc().initializeFullCopy(Result, Size);
8502
8503 ExplicitSignature = FunctionProtoTypeLoc();
8504 }
John McCall82dc0092010-06-04 11:21:44 +00008505 }
Mike Stump1eb44332009-09-09 15:08:12 +00008506
John McCall711c52b2011-01-05 12:14:39 +00008507 CurBlock->TheDecl->setSignatureAsWritten(Sig);
8508 CurBlock->FunctionType = T;
8509
8510 const FunctionType *Fn = T->getAs<FunctionType>();
8511 QualType RetTy = Fn->getResultType();
8512 bool isVariadic =
8513 (isa<FunctionProtoType>(Fn) && cast<FunctionProtoType>(Fn)->isVariadic());
8514
John McCallc71a4912010-06-04 19:02:56 +00008515 CurBlock->TheDecl->setIsVariadic(isVariadic);
Douglas Gregora873dfc2010-02-03 00:27:59 +00008516
John McCall82dc0092010-06-04 11:21:44 +00008517 // Don't allow returning a objc interface by value.
8518 if (RetTy->isObjCObjectType()) {
8519 Diag(ParamInfo.getSourceRange().getBegin(),
8520 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy;
8521 return;
8522 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008523
John McCall82dc0092010-06-04 11:21:44 +00008524 // Context.DependentTy is used as a placeholder for a missing block
John McCallc71a4912010-06-04 19:02:56 +00008525 // return type. TODO: what should we do with declarators like:
8526 // ^ * { ... }
8527 // If the answer is "apply template argument deduction"....
John McCall82dc0092010-06-04 11:21:44 +00008528 if (RetTy != Context.DependentTy)
8529 CurBlock->ReturnType = RetTy;
Mike Stumpeed9cac2009-02-19 03:04:26 +00008530
John McCall82dc0092010-06-04 11:21:44 +00008531 // Push block parameters from the declarator if we had them.
Chris Lattner5f9e2722011-07-23 10:55:15 +00008532 SmallVector<ParmVarDecl*, 8> Params;
John McCall711c52b2011-01-05 12:14:39 +00008533 if (ExplicitSignature) {
8534 for (unsigned I = 0, E = ExplicitSignature.getNumArgs(); I != E; ++I) {
8535 ParmVarDecl *Param = ExplicitSignature.getArg(I);
Fariborz Jahanian9a66c302010-02-12 21:53:14 +00008536 if (Param->getIdentifier() == 0 &&
8537 !Param->isImplicit() &&
8538 !Param->isInvalidDecl() &&
8539 !getLangOptions().CPlusPlus)
8540 Diag(Param->getLocation(), diag::err_parameter_name_omitted);
John McCallc71a4912010-06-04 19:02:56 +00008541 Params.push_back(Param);
Fariborz Jahanian9a66c302010-02-12 21:53:14 +00008542 }
John McCall82dc0092010-06-04 11:21:44 +00008543
8544 // Fake up parameter variables if we have a typedef, like
8545 // ^ fntype { ... }
8546 } else if (const FunctionProtoType *Fn = T->getAs<FunctionProtoType>()) {
8547 for (FunctionProtoType::arg_type_iterator
8548 I = Fn->arg_type_begin(), E = Fn->arg_type_end(); I != E; ++I) {
8549 ParmVarDecl *Param =
8550 BuildParmVarDeclForTypedef(CurBlock->TheDecl,
8551 ParamInfo.getSourceRange().getBegin(),
8552 *I);
John McCallc71a4912010-06-04 19:02:56 +00008553 Params.push_back(Param);
John McCall82dc0092010-06-04 11:21:44 +00008554 }
Steve Naroff4eb206b2008-09-03 18:15:37 +00008555 }
John McCall82dc0092010-06-04 11:21:44 +00008556
John McCallc71a4912010-06-04 19:02:56 +00008557 // Set the parameters on the block decl.
Douglas Gregor82aa7132010-11-01 18:37:59 +00008558 if (!Params.empty()) {
John McCallc71a4912010-06-04 19:02:56 +00008559 CurBlock->TheDecl->setParams(Params.data(), Params.size());
Douglas Gregor82aa7132010-11-01 18:37:59 +00008560 CheckParmsForFunctionDef(CurBlock->TheDecl->param_begin(),
8561 CurBlock->TheDecl->param_end(),
8562 /*CheckParameterNames=*/false);
8563 }
8564
John McCall82dc0092010-06-04 11:21:44 +00008565 // Finally we can process decl attributes.
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00008566 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo);
John McCall053f4bd2010-03-22 09:20:08 +00008567
John McCallc71a4912010-06-04 19:02:56 +00008568 if (!isVariadic && CurBlock->TheDecl->getAttr<SentinelAttr>()) {
John McCall82dc0092010-06-04 11:21:44 +00008569 Diag(ParamInfo.getAttributes()->getLoc(),
8570 diag::warn_attribute_sentinel_not_variadic) << 1;
8571 // FIXME: remove the attribute.
8572 }
8573
8574 // Put the parameter variables in scope. We can bail out immediately
8575 // if we don't have any.
John McCallc71a4912010-06-04 19:02:56 +00008576 if (Params.empty())
John McCall82dc0092010-06-04 11:21:44 +00008577 return;
8578
Steve Naroff090276f2008-10-10 01:28:17 +00008579 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(),
John McCall7a9813c2010-01-22 00:28:27 +00008580 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) {
8581 (*AI)->setOwningFunction(CurBlock->TheDecl);
8582
Steve Naroff090276f2008-10-10 01:28:17 +00008583 // If this has an identifier, add it to the scope stack.
John McCall053f4bd2010-03-22 09:20:08 +00008584 if ((*AI)->getIdentifier()) {
Argyrios Kyrtzidis08274082010-12-15 18:44:22 +00008585 CheckShadow(CurBlock->TheScope, *AI);
John McCall053f4bd2010-03-22 09:20:08 +00008586
Steve Naroff090276f2008-10-10 01:28:17 +00008587 PushOnScopeChains(*AI, CurBlock->TheScope);
John McCall053f4bd2010-03-22 09:20:08 +00008588 }
John McCall7a9813c2010-01-22 00:28:27 +00008589 }
Steve Naroff4eb206b2008-09-03 18:15:37 +00008590}
8591
8592/// ActOnBlockError - If there is an error parsing a block, this callback
8593/// is invoked to pop the information about the block from the action impl.
8594void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) {
Steve Naroff4eb206b2008-09-03 18:15:37 +00008595 // Pop off CurBlock, handle nested blocks.
Chris Lattner5c59e2b2009-04-21 22:38:46 +00008596 PopDeclContext();
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008597 PopFunctionOrBlockScope();
Steve Naroff4eb206b2008-09-03 18:15:37 +00008598}
8599
8600/// ActOnBlockStmtExpr - This is called when the body of a block statement
8601/// literal was successfully completed. ^(int x){...}
John McCall60d7b3a2010-08-24 06:29:42 +00008602ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc,
Chris Lattnere476bdc2011-02-17 23:58:47 +00008603 Stmt *Body, Scope *CurScope) {
Chris Lattner9af55002009-03-27 04:18:06 +00008604 // If blocks are disabled, emit an error.
8605 if (!LangOpts.Blocks)
8606 Diag(CaretLoc, diag::err_blocks_disable);
Mike Stump1eb44332009-09-09 15:08:12 +00008607
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008608 BlockScopeInfo *BSI = cast<BlockScopeInfo>(FunctionScopes.back());
Fariborz Jahaniana729da22010-07-09 18:44:02 +00008609
Steve Naroff090276f2008-10-10 01:28:17 +00008610 PopDeclContext();
8611
Steve Naroff4eb206b2008-09-03 18:15:37 +00008612 QualType RetTy = Context.VoidTy;
Fariborz Jahanian7d5c74e2009-06-19 23:37:08 +00008613 if (!BSI->ReturnType.isNull())
8614 RetTy = BSI->ReturnType;
Mike Stumpeed9cac2009-02-19 03:04:26 +00008615
Mike Stump56925862009-07-28 22:04:01 +00008616 bool NoReturn = BSI->TheDecl->getAttr<NoReturnAttr>();
Steve Naroff4eb206b2008-09-03 18:15:37 +00008617 QualType BlockTy;
John McCallc71a4912010-06-04 19:02:56 +00008618
John McCall469a1eb2011-02-02 13:00:07 +00008619 // Set the captured variables on the block.
John McCall6b5a61b2011-02-07 10:33:21 +00008620 BSI->TheDecl->setCaptures(Context, BSI->Captures.begin(), BSI->Captures.end(),
8621 BSI->CapturesCXXThis);
John McCall469a1eb2011-02-02 13:00:07 +00008622
John McCallc71a4912010-06-04 19:02:56 +00008623 // If the user wrote a function type in some form, try to use that.
8624 if (!BSI->FunctionType.isNull()) {
8625 const FunctionType *FTy = BSI->FunctionType->getAs<FunctionType>();
8626
8627 FunctionType::ExtInfo Ext = FTy->getExtInfo();
8628 if (NoReturn && !Ext.getNoReturn()) Ext = Ext.withNoReturn(true);
8629
8630 // Turn protoless block types into nullary block types.
8631 if (isa<FunctionNoProtoType>(FTy)) {
John McCalle23cf432010-12-14 08:05:40 +00008632 FunctionProtoType::ExtProtoInfo EPI;
8633 EPI.ExtInfo = Ext;
8634 BlockTy = Context.getFunctionType(RetTy, 0, 0, EPI);
John McCallc71a4912010-06-04 19:02:56 +00008635
8636 // Otherwise, if we don't need to change anything about the function type,
8637 // preserve its sugar structure.
8638 } else if (FTy->getResultType() == RetTy &&
8639 (!NoReturn || FTy->getNoReturnAttr())) {
8640 BlockTy = BSI->FunctionType;
8641
8642 // Otherwise, make the minimal modifications to the function type.
8643 } else {
8644 const FunctionProtoType *FPT = cast<FunctionProtoType>(FTy);
John McCalle23cf432010-12-14 08:05:40 +00008645 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
8646 EPI.TypeQuals = 0; // FIXME: silently?
8647 EPI.ExtInfo = Ext;
John McCallc71a4912010-06-04 19:02:56 +00008648 BlockTy = Context.getFunctionType(RetTy,
8649 FPT->arg_type_begin(),
8650 FPT->getNumArgs(),
John McCalle23cf432010-12-14 08:05:40 +00008651 EPI);
John McCallc71a4912010-06-04 19:02:56 +00008652 }
8653
8654 // If we don't have a function type, just build one from nothing.
8655 } else {
John McCalle23cf432010-12-14 08:05:40 +00008656 FunctionProtoType::ExtProtoInfo EPI;
John McCallf85e1932011-06-15 23:02:42 +00008657 EPI.ExtInfo = FunctionType::ExtInfo().withNoReturn(NoReturn);
John McCalle23cf432010-12-14 08:05:40 +00008658 BlockTy = Context.getFunctionType(RetTy, 0, 0, EPI);
John McCallc71a4912010-06-04 19:02:56 +00008659 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008660
John McCallc71a4912010-06-04 19:02:56 +00008661 DiagnoseUnusedParameters(BSI->TheDecl->param_begin(),
8662 BSI->TheDecl->param_end());
Steve Naroff4eb206b2008-09-03 18:15:37 +00008663 BlockTy = Context.getBlockPointerType(BlockTy);
Mike Stumpeed9cac2009-02-19 03:04:26 +00008664
Chris Lattner17a78302009-04-19 05:28:12 +00008665 // If needed, diagnose invalid gotos and switches in the block.
John McCallf85e1932011-06-15 23:02:42 +00008666 if (getCurFunction()->NeedsScopeChecking() &&
8667 !hasAnyUnrecoverableErrorsInThisFunction())
John McCall9ae2f072010-08-23 23:25:46 +00008668 DiagnoseInvalidJumps(cast<CompoundStmt>(Body));
Mike Stump1eb44332009-09-09 15:08:12 +00008669
Chris Lattnere476bdc2011-02-17 23:58:47 +00008670 BSI->TheDecl->setBody(cast<CompoundStmt>(Body));
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008671
Fariborz Jahanian4e7c7f22011-07-11 18:04:54 +00008672 for (BlockDecl::capture_const_iterator ci = BSI->TheDecl->capture_begin(),
8673 ce = BSI->TheDecl->capture_end(); ci != ce; ++ci) {
8674 const VarDecl *variable = ci->getVariable();
8675 QualType T = variable->getType();
8676 QualType::DestructionKind destructKind = T.isDestructedType();
8677 if (destructKind != QualType::DK_none)
8678 getCurFunction()->setHasBranchProtectedScope();
8679 }
8680
Benjamin Kramerd2486192011-07-12 14:11:05 +00008681 BlockExpr *Result = new (Context) BlockExpr(BSI->TheDecl, BlockTy);
8682 const AnalysisBasedWarnings::Policy &WP = AnalysisWarnings.getDefaultPolicy();
8683 PopFunctionOrBlockScope(&WP, Result->getBlockDecl(), Result);
8684
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008685 return Owned(Result);
Steve Naroff4eb206b2008-09-03 18:15:37 +00008686}
8687
John McCall60d7b3a2010-08-24 06:29:42 +00008688ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc,
John McCallb3d87482010-08-24 05:47:05 +00008689 Expr *expr, ParsedType type,
Sebastian Redlf53597f2009-03-15 17:47:39 +00008690 SourceLocation RPLoc) {
Abramo Bagnara2cad9002010-08-10 10:06:15 +00008691 TypeSourceInfo *TInfo;
Jeffrey Yasskindec09842011-01-18 02:00:16 +00008692 GetTypeFromParser(type, &TInfo);
John McCall9ae2f072010-08-23 23:25:46 +00008693 return BuildVAArgExpr(BuiltinLoc, expr, TInfo, RPLoc);
Abramo Bagnara2cad9002010-08-10 10:06:15 +00008694}
8695
John McCall60d7b3a2010-08-24 06:29:42 +00008696ExprResult Sema::BuildVAArgExpr(SourceLocation BuiltinLoc,
John McCallf89e55a2010-11-18 06:31:45 +00008697 Expr *E, TypeSourceInfo *TInfo,
8698 SourceLocation RPLoc) {
Chris Lattner0d20b8a2009-04-05 15:49:53 +00008699 Expr *OrigExpr = E;
Mike Stump1eb44332009-09-09 15:08:12 +00008700
Eli Friedmanc34bcde2008-08-09 23:32:40 +00008701 // Get the va_list type
8702 QualType VaListType = Context.getBuiltinVaListType();
Eli Friedman5c091ba2009-05-16 12:46:54 +00008703 if (VaListType->isArrayType()) {
8704 // Deal with implicit array decay; for example, on x86-64,
8705 // va_list is an array, but it's supposed to decay to
8706 // a pointer for va_arg.
Eli Friedmanc34bcde2008-08-09 23:32:40 +00008707 VaListType = Context.getArrayDecayedType(VaListType);
Eli Friedman5c091ba2009-05-16 12:46:54 +00008708 // Make sure the input expression also decays appropriately.
John Wiegley429bb272011-04-08 18:41:53 +00008709 ExprResult Result = UsualUnaryConversions(E);
8710 if (Result.isInvalid())
8711 return ExprError();
8712 E = Result.take();
Eli Friedman5c091ba2009-05-16 12:46:54 +00008713 } else {
8714 // Otherwise, the va_list argument must be an l-value because
8715 // it is modified by va_arg.
Mike Stump1eb44332009-09-09 15:08:12 +00008716 if (!E->isTypeDependent() &&
Douglas Gregordd027302009-05-19 23:10:31 +00008717 CheckForModifiableLvalue(E, BuiltinLoc, *this))
Eli Friedman5c091ba2009-05-16 12:46:54 +00008718 return ExprError();
8719 }
Eli Friedmanc34bcde2008-08-09 23:32:40 +00008720
Douglas Gregordd027302009-05-19 23:10:31 +00008721 if (!E->isTypeDependent() &&
8722 !Context.hasSameType(VaListType, E->getType())) {
Sebastian Redlf53597f2009-03-15 17:47:39 +00008723 return ExprError(Diag(E->getLocStart(),
8724 diag::err_first_argument_to_va_arg_not_of_type_va_list)
Chris Lattner0d20b8a2009-04-05 15:49:53 +00008725 << OrigExpr->getType() << E->getSourceRange());
Chris Lattner9dc8f192009-04-05 00:59:53 +00008726 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008727
David Majnemer0adde122011-06-14 05:17:32 +00008728 if (!TInfo->getType()->isDependentType()) {
8729 if (RequireCompleteType(TInfo->getTypeLoc().getBeginLoc(), TInfo->getType(),
8730 PDiag(diag::err_second_parameter_to_va_arg_incomplete)
8731 << TInfo->getTypeLoc().getSourceRange()))
8732 return ExprError();
David Majnemerdb11b012011-06-13 06:37:03 +00008733
David Majnemer0adde122011-06-14 05:17:32 +00008734 if (RequireNonAbstractType(TInfo->getTypeLoc().getBeginLoc(),
8735 TInfo->getType(),
8736 PDiag(diag::err_second_parameter_to_va_arg_abstract)
8737 << TInfo->getTypeLoc().getSourceRange()))
8738 return ExprError();
8739
Douglas Gregor4eb75222011-07-30 06:45:27 +00008740 if (!TInfo->getType().isPODType(Context)) {
David Majnemer0adde122011-06-14 05:17:32 +00008741 Diag(TInfo->getTypeLoc().getBeginLoc(),
Douglas Gregor4eb75222011-07-30 06:45:27 +00008742 TInfo->getType()->isObjCLifetimeType()
8743 ? diag::warn_second_parameter_to_va_arg_ownership_qualified
8744 : diag::warn_second_parameter_to_va_arg_not_pod)
David Majnemer0adde122011-06-14 05:17:32 +00008745 << TInfo->getType()
8746 << TInfo->getTypeLoc().getSourceRange();
Douglas Gregor4eb75222011-07-30 06:45:27 +00008747 }
Eli Friedman46d37c12011-07-11 21:45:59 +00008748
8749 // Check for va_arg where arguments of the given type will be promoted
8750 // (i.e. this va_arg is guaranteed to have undefined behavior).
8751 QualType PromoteType;
8752 if (TInfo->getType()->isPromotableIntegerType()) {
8753 PromoteType = Context.getPromotedIntegerType(TInfo->getType());
8754 if (Context.typesAreCompatible(PromoteType, TInfo->getType()))
8755 PromoteType = QualType();
8756 }
8757 if (TInfo->getType()->isSpecificBuiltinType(BuiltinType::Float))
8758 PromoteType = Context.DoubleTy;
8759 if (!PromoteType.isNull())
8760 Diag(TInfo->getTypeLoc().getBeginLoc(),
8761 diag::warn_second_parameter_to_va_arg_never_compatible)
8762 << TInfo->getType()
8763 << PromoteType
8764 << TInfo->getTypeLoc().getSourceRange();
David Majnemer0adde122011-06-14 05:17:32 +00008765 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008766
Abramo Bagnara2cad9002010-08-10 10:06:15 +00008767 QualType T = TInfo->getType().getNonLValueExprType(Context);
8768 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, TInfo, RPLoc, T));
Anders Carlsson7c50aca2007-10-15 20:28:48 +00008769}
8770
John McCall60d7b3a2010-08-24 06:29:42 +00008771ExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) {
Douglas Gregor2d8b2732008-11-29 04:51:27 +00008772 // The type of __null will be int or long, depending on the size of
8773 // pointers on the target.
8774 QualType Ty;
NAKAMURA Takumi6e5658d2011-01-19 00:11:41 +00008775 unsigned pw = Context.Target.getPointerWidth(0);
8776 if (pw == Context.Target.getIntWidth())
Douglas Gregor2d8b2732008-11-29 04:51:27 +00008777 Ty = Context.IntTy;
NAKAMURA Takumi6e5658d2011-01-19 00:11:41 +00008778 else if (pw == Context.Target.getLongWidth())
Douglas Gregor2d8b2732008-11-29 04:51:27 +00008779 Ty = Context.LongTy;
NAKAMURA Takumi6e5658d2011-01-19 00:11:41 +00008780 else if (pw == Context.Target.getLongLongWidth())
8781 Ty = Context.LongLongTy;
8782 else {
8783 assert(!"I don't know size of pointer!");
8784 Ty = Context.IntTy;
8785 }
Douglas Gregor2d8b2732008-11-29 04:51:27 +00008786
Sebastian Redlf53597f2009-03-15 17:47:39 +00008787 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc));
Douglas Gregor2d8b2732008-11-29 04:51:27 +00008788}
8789
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00008790static void MakeObjCStringLiteralFixItHint(Sema& SemaRef, QualType DstType,
Douglas Gregor849b2432010-03-31 17:46:05 +00008791 Expr *SrcExpr, FixItHint &Hint) {
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00008792 if (!SemaRef.getLangOptions().ObjC1)
8793 return;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008794
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00008795 const ObjCObjectPointerType *PT = DstType->getAs<ObjCObjectPointerType>();
8796 if (!PT)
8797 return;
8798
8799 // Check if the destination is of type 'id'.
8800 if (!PT->isObjCIdType()) {
8801 // Check if the destination is the 'NSString' interface.
8802 const ObjCInterfaceDecl *ID = PT->getInterfaceDecl();
8803 if (!ID || !ID->getIdentifier()->isStr("NSString"))
8804 return;
8805 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008806
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00008807 // Strip off any parens and casts.
8808 StringLiteral *SL = dyn_cast<StringLiteral>(SrcExpr->IgnoreParenCasts());
Douglas Gregor5cee1192011-07-27 05:40:30 +00008809 if (!SL || !SL->isAscii())
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00008810 return;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008811
Douglas Gregor849b2432010-03-31 17:46:05 +00008812 Hint = FixItHint::CreateInsertion(SL->getLocStart(), "@");
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00008813}
8814
Chris Lattner5cf216b2008-01-04 18:04:52 +00008815bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy,
8816 SourceLocation Loc,
8817 QualType DstType, QualType SrcType,
Douglas Gregora41a8c52010-04-22 00:20:18 +00008818 Expr *SrcExpr, AssignmentAction Action,
8819 bool *Complained) {
8820 if (Complained)
8821 *Complained = false;
8822
Chris Lattner5cf216b2008-01-04 18:04:52 +00008823 // Decode the result (notice that AST's are still created for extensions).
Douglas Gregor926df6c2011-06-11 01:09:30 +00008824 bool CheckInferredResultType = false;
Chris Lattner5cf216b2008-01-04 18:04:52 +00008825 bool isInvalid = false;
8826 unsigned DiagKind;
Douglas Gregor849b2432010-03-31 17:46:05 +00008827 FixItHint Hint;
Anna Zaks67221552011-07-28 19:51:27 +00008828 ConversionFixItGenerator ConvHints;
8829 bool MayHaveConvFixit = false;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008830
Chris Lattner5cf216b2008-01-04 18:04:52 +00008831 switch (ConvTy) {
8832 default: assert(0 && "Unknown conversion type");
8833 case Compatible: return false;
Chris Lattnerb7b61152008-01-04 18:22:42 +00008834 case PointerToInt:
Chris Lattner5cf216b2008-01-04 18:04:52 +00008835 DiagKind = diag::ext_typecheck_convert_pointer_int;
Anna Zaks67221552011-07-28 19:51:27 +00008836 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
8837 MayHaveConvFixit = true;
Chris Lattner5cf216b2008-01-04 18:04:52 +00008838 break;
Chris Lattnerb7b61152008-01-04 18:22:42 +00008839 case IntToPointer:
8840 DiagKind = diag::ext_typecheck_convert_int_pointer;
Anna Zaks67221552011-07-28 19:51:27 +00008841 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
8842 MayHaveConvFixit = true;
Chris Lattnerb7b61152008-01-04 18:22:42 +00008843 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00008844 case IncompatiblePointer:
Douglas Gregor849b2432010-03-31 17:46:05 +00008845 MakeObjCStringLiteralFixItHint(*this, DstType, SrcExpr, Hint);
Chris Lattner5cf216b2008-01-04 18:04:52 +00008846 DiagKind = diag::ext_typecheck_convert_incompatible_pointer;
Douglas Gregor926df6c2011-06-11 01:09:30 +00008847 CheckInferredResultType = DstType->isObjCObjectPointerType() &&
8848 SrcType->isObjCObjectPointerType();
Anna Zaks67221552011-07-28 19:51:27 +00008849 if (Hint.isNull() && !CheckInferredResultType) {
8850 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
8851 }
8852 MayHaveConvFixit = true;
Chris Lattner5cf216b2008-01-04 18:04:52 +00008853 break;
Eli Friedmanf05c05d2009-03-22 23:59:44 +00008854 case IncompatiblePointerSign:
8855 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign;
8856 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00008857 case FunctionVoidPointer:
8858 DiagKind = diag::ext_typecheck_convert_pointer_void_func;
8859 break;
John McCall86c05f32011-02-01 00:10:29 +00008860 case IncompatiblePointerDiscardsQualifiers: {
John McCall40249e72011-02-01 23:28:01 +00008861 // Perform array-to-pointer decay if necessary.
8862 if (SrcType->isArrayType()) SrcType = Context.getArrayDecayedType(SrcType);
8863
John McCall86c05f32011-02-01 00:10:29 +00008864 Qualifiers lhq = SrcType->getPointeeType().getQualifiers();
8865 Qualifiers rhq = DstType->getPointeeType().getQualifiers();
8866 if (lhq.getAddressSpace() != rhq.getAddressSpace()) {
8867 DiagKind = diag::err_typecheck_incompatible_address_space;
8868 break;
John McCallf85e1932011-06-15 23:02:42 +00008869
8870
8871 } else if (lhq.getObjCLifetime() != rhq.getObjCLifetime()) {
Argyrios Kyrtzidisb8b03132011-06-24 00:08:59 +00008872 DiagKind = diag::err_typecheck_incompatible_ownership;
John McCallf85e1932011-06-15 23:02:42 +00008873 break;
John McCall86c05f32011-02-01 00:10:29 +00008874 }
8875
8876 llvm_unreachable("unknown error case for discarding qualifiers!");
8877 // fallthrough
8878 }
Chris Lattner5cf216b2008-01-04 18:04:52 +00008879 case CompatiblePointerDiscardsQualifiers:
Douglas Gregor77a52232008-09-12 00:47:35 +00008880 // If the qualifiers lost were because we were applying the
8881 // (deprecated) C++ conversion from a string literal to a char*
8882 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME:
8883 // Ideally, this check would be performed in
John McCalle4be87e2011-01-31 23:13:11 +00008884 // checkPointerTypesForAssignment. However, that would require a
Douglas Gregor77a52232008-09-12 00:47:35 +00008885 // bit of refactoring (so that the second argument is an
8886 // expression, rather than a type), which should be done as part
John McCalle4be87e2011-01-31 23:13:11 +00008887 // of a larger effort to fix checkPointerTypesForAssignment for
Douglas Gregor77a52232008-09-12 00:47:35 +00008888 // C++ semantics.
8889 if (getLangOptions().CPlusPlus &&
8890 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType))
8891 return false;
Chris Lattner5cf216b2008-01-04 18:04:52 +00008892 DiagKind = diag::ext_typecheck_convert_discards_qualifiers;
8893 break;
Sean Huntc9132b62009-11-08 07:46:34 +00008894 case IncompatibleNestedPointerQualifiers:
Fariborz Jahanian3451e922009-11-09 22:16:37 +00008895 DiagKind = diag::ext_nested_pointer_qualifier_mismatch;
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00008896 break;
Steve Naroff1c7d0672008-09-04 15:10:53 +00008897 case IntToBlockPointer:
8898 DiagKind = diag::err_int_to_block_pointer;
8899 break;
8900 case IncompatibleBlockPointer:
Mike Stump25efa102009-04-21 22:51:42 +00008901 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer;
Steve Naroff1c7d0672008-09-04 15:10:53 +00008902 break;
Steve Naroff39579072008-10-14 22:18:38 +00008903 case IncompatibleObjCQualifiedId:
Mike Stumpeed9cac2009-02-19 03:04:26 +00008904 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since
Steve Naroff39579072008-10-14 22:18:38 +00008905 // it can give a more specific diagnostic.
8906 DiagKind = diag::warn_incompatible_qualified_id;
8907 break;
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00008908 case IncompatibleVectors:
8909 DiagKind = diag::warn_incompatible_vectors;
8910 break;
Fariborz Jahanian04e5a252011-07-07 18:55:47 +00008911 case IncompatibleObjCWeakRef:
8912 DiagKind = diag::err_arc_weak_unavailable_assign;
8913 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00008914 case Incompatible:
8915 DiagKind = diag::err_typecheck_convert_incompatible;
Anna Zaks67221552011-07-28 19:51:27 +00008916 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
8917 MayHaveConvFixit = true;
Chris Lattner5cf216b2008-01-04 18:04:52 +00008918 isInvalid = true;
8919 break;
8920 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008921
Douglas Gregord4eea832010-04-09 00:35:39 +00008922 QualType FirstType, SecondType;
8923 switch (Action) {
8924 case AA_Assigning:
8925 case AA_Initializing:
8926 // The destination type comes first.
8927 FirstType = DstType;
8928 SecondType = SrcType;
8929 break;
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00008930
Douglas Gregord4eea832010-04-09 00:35:39 +00008931 case AA_Returning:
8932 case AA_Passing:
8933 case AA_Converting:
8934 case AA_Sending:
8935 case AA_Casting:
8936 // The source type comes first.
8937 FirstType = SrcType;
8938 SecondType = DstType;
8939 break;
8940 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00008941
Anna Zaks67221552011-07-28 19:51:27 +00008942 PartialDiagnostic FDiag = PDiag(DiagKind);
8943 FDiag << FirstType << SecondType << Action << SrcExpr->getSourceRange();
8944
8945 // If we can fix the conversion, suggest the FixIts.
8946 assert(ConvHints.isNull() || Hint.isNull());
8947 if (!ConvHints.isNull()) {
8948 for (llvm::SmallVector<FixItHint, 1>::iterator
8949 HI = ConvHints.Hints.begin(), HE = ConvHints.Hints.end();
8950 HI != HE; ++HI)
8951 FDiag << *HI;
8952 } else {
8953 FDiag << Hint;
8954 }
8955 if (MayHaveConvFixit) { FDiag << (unsigned) (ConvHints.Kind); }
8956
8957 Diag(Loc, FDiag);
8958
Douglas Gregor926df6c2011-06-11 01:09:30 +00008959 if (CheckInferredResultType)
8960 EmitRelatedResultTypeNote(SrcExpr);
8961
Douglas Gregora41a8c52010-04-22 00:20:18 +00008962 if (Complained)
8963 *Complained = true;
Chris Lattner5cf216b2008-01-04 18:04:52 +00008964 return isInvalid;
8965}
Anders Carlssone21555e2008-11-30 19:50:32 +00008966
Chris Lattner3bf68932009-04-25 21:59:05 +00008967bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){
Eli Friedman3b5ccca2009-04-25 22:26:58 +00008968 llvm::APSInt ICEResult;
8969 if (E->isIntegerConstantExpr(ICEResult, Context)) {
8970 if (Result)
8971 *Result = ICEResult;
8972 return false;
8973 }
8974
Anders Carlssone21555e2008-11-30 19:50:32 +00008975 Expr::EvalResult EvalResult;
8976
Mike Stumpeed9cac2009-02-19 03:04:26 +00008977 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() ||
Anders Carlssone21555e2008-11-30 19:50:32 +00008978 EvalResult.HasSideEffects) {
8979 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange();
8980
8981 if (EvalResult.Diag) {
8982 // We only show the note if it's not the usual "invalid subexpression"
8983 // or if it's actually in a subexpression.
8984 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice ||
8985 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens())
8986 Diag(EvalResult.DiagLoc, EvalResult.Diag);
8987 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008988
Anders Carlssone21555e2008-11-30 19:50:32 +00008989 return true;
8990 }
8991
Eli Friedman3b5ccca2009-04-25 22:26:58 +00008992 Diag(E->getExprLoc(), diag::ext_expr_not_ice) <<
8993 E->getSourceRange();
Anders Carlssone21555e2008-11-30 19:50:32 +00008994
Eli Friedman3b5ccca2009-04-25 22:26:58 +00008995 if (EvalResult.Diag &&
Argyrios Kyrtzidis08274082010-12-15 18:44:22 +00008996 Diags.getDiagnosticLevel(diag::ext_expr_not_ice, EvalResult.DiagLoc)
8997 != Diagnostic::Ignored)
Eli Friedman3b5ccca2009-04-25 22:26:58 +00008998 Diag(EvalResult.DiagLoc, EvalResult.Diag);
Mike Stumpeed9cac2009-02-19 03:04:26 +00008999
Anders Carlssone21555e2008-11-30 19:50:32 +00009000 if (Result)
9001 *Result = EvalResult.Val.getInt();
9002 return false;
9003}
Douglas Gregore0762c92009-06-19 23:52:42 +00009004
Douglas Gregor2afce722009-11-26 00:44:06 +00009005void
Mike Stump1eb44332009-09-09 15:08:12 +00009006Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext) {
Douglas Gregor2afce722009-11-26 00:44:06 +00009007 ExprEvalContexts.push_back(
John McCallf85e1932011-06-15 23:02:42 +00009008 ExpressionEvaluationContextRecord(NewContext,
9009 ExprTemporaries.size(),
9010 ExprNeedsCleanups));
9011 ExprNeedsCleanups = false;
Douglas Gregorac7610d2009-06-22 20:57:11 +00009012}
9013
Richard Trieu67e29332011-08-02 04:35:43 +00009014void Sema::PopExpressionEvaluationContext() {
Douglas Gregor2afce722009-11-26 00:44:06 +00009015 // Pop the current expression evaluation context off the stack.
9016 ExpressionEvaluationContextRecord Rec = ExprEvalContexts.back();
9017 ExprEvalContexts.pop_back();
Douglas Gregorac7610d2009-06-22 20:57:11 +00009018
Douglas Gregor06d33692009-12-12 07:57:52 +00009019 if (Rec.Context == PotentiallyPotentiallyEvaluated) {
9020 if (Rec.PotentiallyReferenced) {
9021 // Mark any remaining declarations in the current position of the stack
9022 // as "referenced". If they were not meant to be referenced, semantic
9023 // analysis would have eliminated them (e.g., in ActOnCXXTypeId).
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009024 for (PotentiallyReferencedDecls::iterator
Douglas Gregor06d33692009-12-12 07:57:52 +00009025 I = Rec.PotentiallyReferenced->begin(),
9026 IEnd = Rec.PotentiallyReferenced->end();
9027 I != IEnd; ++I)
9028 MarkDeclarationReferenced(I->first, I->second);
9029 }
9030
9031 if (Rec.PotentiallyDiagnosed) {
9032 // Emit any pending diagnostics.
9033 for (PotentiallyEmittedDiagnostics::iterator
9034 I = Rec.PotentiallyDiagnosed->begin(),
9035 IEnd = Rec.PotentiallyDiagnosed->end();
9036 I != IEnd; ++I)
9037 Diag(I->first, I->second);
9038 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009039 }
Douglas Gregor2afce722009-11-26 00:44:06 +00009040
9041 // When are coming out of an unevaluated context, clear out any
9042 // temporaries that we may have created as part of the evaluation of
9043 // the expression in that context: they aren't relevant because they
9044 // will never be constructed.
John McCallf85e1932011-06-15 23:02:42 +00009045 if (Rec.Context == Unevaluated) {
Douglas Gregor2afce722009-11-26 00:44:06 +00009046 ExprTemporaries.erase(ExprTemporaries.begin() + Rec.NumTemporaries,
9047 ExprTemporaries.end());
John McCallf85e1932011-06-15 23:02:42 +00009048 ExprNeedsCleanups = Rec.ParentNeedsCleanups;
9049
9050 // Otherwise, merge the contexts together.
9051 } else {
9052 ExprNeedsCleanups |= Rec.ParentNeedsCleanups;
9053 }
Douglas Gregor2afce722009-11-26 00:44:06 +00009054
9055 // Destroy the popped expression evaluation record.
9056 Rec.Destroy();
Douglas Gregorac7610d2009-06-22 20:57:11 +00009057}
Douglas Gregore0762c92009-06-19 23:52:42 +00009058
John McCallf85e1932011-06-15 23:02:42 +00009059void Sema::DiscardCleanupsInEvaluationContext() {
9060 ExprTemporaries.erase(
9061 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries,
9062 ExprTemporaries.end());
9063 ExprNeedsCleanups = false;
9064}
9065
Douglas Gregore0762c92009-06-19 23:52:42 +00009066/// \brief Note that the given declaration was referenced in the source code.
9067///
9068/// This routine should be invoke whenever a given declaration is referenced
9069/// in the source code, and where that reference occurred. If this declaration
9070/// reference means that the the declaration is used (C++ [basic.def.odr]p2,
9071/// C99 6.9p3), then the declaration will be marked as used.
9072///
9073/// \param Loc the location where the declaration was referenced.
9074///
9075/// \param D the declaration that has been referenced by the source code.
9076void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) {
9077 assert(D && "No declaration?");
Mike Stump1eb44332009-09-09 15:08:12 +00009078
Argyrios Kyrtzidis6b6b42a2011-04-19 19:51:10 +00009079 D->setReferenced();
9080
Douglas Gregorc070cc62010-06-17 23:14:26 +00009081 if (D->isUsed(false))
Douglas Gregord7f37bf2009-06-22 23:06:13 +00009082 return;
Mike Stump1eb44332009-09-09 15:08:12 +00009083
Richard Trieu67e29332011-08-02 04:35:43 +00009084 // Mark a parameter or variable declaration "used", regardless of whether
9085 // we're in a template or not. The reason for this is that unevaluated
9086 // expressions (e.g. (void)sizeof()) constitute a use for warning purposes
9087 // (-Wunused-variables and -Wunused-parameters)
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009088 if (isa<ParmVarDecl>(D) ||
Douglas Gregorfc2ca562010-04-07 20:29:57 +00009089 (isa<VarDecl>(D) && D->getDeclContext()->isFunctionOrMethod())) {
Anders Carlsson2127ecc2010-10-22 23:37:08 +00009090 D->setUsed();
Douglas Gregorfc2ca562010-04-07 20:29:57 +00009091 return;
9092 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00009093
Douglas Gregorfc2ca562010-04-07 20:29:57 +00009094 if (!isa<VarDecl>(D) && !isa<FunctionDecl>(D))
9095 return;
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00009096
Douglas Gregore0762c92009-06-19 23:52:42 +00009097 // Do not mark anything as "used" within a dependent context; wait for
9098 // an instantiation.
9099 if (CurContext->isDependentContext())
9100 return;
Mike Stump1eb44332009-09-09 15:08:12 +00009101
Douglas Gregor2afce722009-11-26 00:44:06 +00009102 switch (ExprEvalContexts.back().Context) {
Douglas Gregorac7610d2009-06-22 20:57:11 +00009103 case Unevaluated:
9104 // We are in an expression that is not potentially evaluated; do nothing.
9105 return;
Mike Stump1eb44332009-09-09 15:08:12 +00009106
Douglas Gregorac7610d2009-06-22 20:57:11 +00009107 case PotentiallyEvaluated:
9108 // We are in a potentially-evaluated expression, so this declaration is
9109 // "used"; handle this below.
9110 break;
Mike Stump1eb44332009-09-09 15:08:12 +00009111
Douglas Gregorac7610d2009-06-22 20:57:11 +00009112 case PotentiallyPotentiallyEvaluated:
9113 // We are in an expression that may be potentially evaluated; queue this
9114 // declaration reference until we know whether the expression is
9115 // potentially evaluated.
Douglas Gregor2afce722009-11-26 00:44:06 +00009116 ExprEvalContexts.back().addReferencedDecl(Loc, D);
Douglas Gregorac7610d2009-06-22 20:57:11 +00009117 return;
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009118
9119 case PotentiallyEvaluatedIfUsed:
9120 // Referenced declarations will only be used if the construct in the
9121 // containing expression is used.
9122 return;
Douglas Gregorac7610d2009-06-22 20:57:11 +00009123 }
Mike Stump1eb44332009-09-09 15:08:12 +00009124
Douglas Gregore0762c92009-06-19 23:52:42 +00009125 // Note that this declaration has been used.
Fariborz Jahanianb7f4cc02009-06-22 17:30:33 +00009126 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) {
Sean Hunt1e238652011-05-12 03:51:51 +00009127 if (Constructor->isDefaulted() && Constructor->isDefaultConstructor()) {
9128 if (Constructor->isTrivial())
Chandler Carruth4e6fbce2010-08-23 07:55:51 +00009129 return;
9130 if (!Constructor->isUsed(false))
9131 DefineImplicitDefaultConstructor(Loc, Constructor);
Sean Hunt509f0482011-05-14 18:20:50 +00009132 } else if (Constructor->isDefaulted() &&
Sean Hunt49634cf2011-05-13 06:10:58 +00009133 Constructor->isCopyConstructor()) {
Douglas Gregorc070cc62010-06-17 23:14:26 +00009134 if (!Constructor->isUsed(false))
Sean Hunt49634cf2011-05-13 06:10:58 +00009135 DefineImplicitCopyConstructor(Loc, Constructor);
Fariborz Jahanian485f0872009-06-22 23:34:40 +00009136 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009137
Douglas Gregor6fb745b2010-05-13 16:44:06 +00009138 MarkVTableUsed(Loc, Constructor->getParent());
Fariborz Jahanian8d2b3562009-06-26 23:49:16 +00009139 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) {
Sean Huntcb45a0f2011-05-12 22:46:25 +00009140 if (Destructor->isDefaulted() && !Destructor->isUsed(false))
Fariborz Jahanian8d2b3562009-06-26 23:49:16 +00009141 DefineImplicitDestructor(Loc, Destructor);
Douglas Gregor6fb745b2010-05-13 16:44:06 +00009142 if (Destructor->isVirtual())
9143 MarkVTableUsed(Loc, Destructor->getParent());
Fariborz Jahanianc75bc2d2009-06-25 21:45:19 +00009144 } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D)) {
Sean Hunt2b188082011-05-14 05:23:28 +00009145 if (MethodDecl->isDefaulted() && MethodDecl->isOverloadedOperator() &&
Fariborz Jahanianc75bc2d2009-06-25 21:45:19 +00009146 MethodDecl->getOverloadedOperator() == OO_Equal) {
Douglas Gregorc070cc62010-06-17 23:14:26 +00009147 if (!MethodDecl->isUsed(false))
Douglas Gregor39957dc2010-05-01 15:04:51 +00009148 DefineImplicitCopyAssignment(Loc, MethodDecl);
Douglas Gregor6fb745b2010-05-13 16:44:06 +00009149 } else if (MethodDecl->isVirtual())
9150 MarkVTableUsed(Loc, MethodDecl->getParent());
Fariborz Jahanianc75bc2d2009-06-25 21:45:19 +00009151 }
Fariborz Jahanianf5ed9e02009-06-24 22:09:44 +00009152 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) {
John McCall15e310a2011-02-19 02:53:41 +00009153 // Recursive functions should be marked when used from another function.
9154 if (CurContext == Function) return;
9155
Mike Stump1eb44332009-09-09 15:08:12 +00009156 // Implicit instantiation of function templates and member functions of
Douglas Gregor1637be72009-06-26 00:10:03 +00009157 // class templates.
Douglas Gregor6cfacfe2010-05-17 17:34:56 +00009158 if (Function->isImplicitlyInstantiable()) {
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009159 bool AlreadyInstantiated = false;
9160 if (FunctionTemplateSpecializationInfo *SpecInfo
9161 = Function->getTemplateSpecializationInfo()) {
9162 if (SpecInfo->getPointOfInstantiation().isInvalid())
9163 SpecInfo->setPointOfInstantiation(Loc);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009164 else if (SpecInfo->getTemplateSpecializationKind()
Douglas Gregor3b846b62009-10-27 20:53:28 +00009165 == TSK_ImplicitInstantiation)
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009166 AlreadyInstantiated = true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009167 } else if (MemberSpecializationInfo *MSInfo
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009168 = Function->getMemberSpecializationInfo()) {
9169 if (MSInfo->getPointOfInstantiation().isInvalid())
9170 MSInfo->setPointOfInstantiation(Loc);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009171 else if (MSInfo->getTemplateSpecializationKind()
Douglas Gregor3b846b62009-10-27 20:53:28 +00009172 == TSK_ImplicitInstantiation)
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009173 AlreadyInstantiated = true;
9174 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009175
Douglas Gregor60406be2010-01-16 22:29:39 +00009176 if (!AlreadyInstantiated) {
9177 if (isa<CXXRecordDecl>(Function->getDeclContext()) &&
9178 cast<CXXRecordDecl>(Function->getDeclContext())->isLocalClass())
9179 PendingLocalImplicitInstantiations.push_back(std::make_pair(Function,
9180 Loc));
9181 else
Chandler Carruth62c78d52010-08-25 08:44:16 +00009182 PendingInstantiations.push_back(std::make_pair(Function, Loc));
Douglas Gregor60406be2010-01-16 22:29:39 +00009183 }
John McCall15e310a2011-02-19 02:53:41 +00009184 } else {
9185 // Walk redefinitions, as some of them may be instantiable.
Gabor Greif40181c42010-08-28 00:16:06 +00009186 for (FunctionDecl::redecl_iterator i(Function->redecls_begin()),
9187 e(Function->redecls_end()); i != e; ++i) {
Gabor Greifbe9ebe32010-08-28 01:58:12 +00009188 if (!i->isUsed(false) && i->isImplicitlyInstantiable())
Gabor Greif40181c42010-08-28 00:16:06 +00009189 MarkDeclarationReferenced(Loc, *i);
9190 }
John McCall15e310a2011-02-19 02:53:41 +00009191 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009192
John McCall15e310a2011-02-19 02:53:41 +00009193 // Keep track of used but undefined functions.
9194 if (!Function->isPure() && !Function->hasBody() &&
9195 Function->getLinkage() != ExternalLinkage) {
9196 SourceLocation &old = UndefinedInternals[Function->getCanonicalDecl()];
9197 if (old.isInvalid()) old = Loc;
9198 }
Argyrios Kyrtzidis58b52592010-08-25 10:34:54 +00009199
John McCall15e310a2011-02-19 02:53:41 +00009200 Function->setUsed(true);
Douglas Gregore0762c92009-06-19 23:52:42 +00009201 return;
Douglas Gregord7f37bf2009-06-22 23:06:13 +00009202 }
Mike Stump1eb44332009-09-09 15:08:12 +00009203
Douglas Gregore0762c92009-06-19 23:52:42 +00009204 if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
Douglas Gregor7caa6822009-07-24 20:34:43 +00009205 // Implicit instantiation of static data members of class templates.
Mike Stump1eb44332009-09-09 15:08:12 +00009206 if (Var->isStaticDataMember() &&
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009207 Var->getInstantiatedFromStaticDataMember()) {
9208 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo();
9209 assert(MSInfo && "Missing member specialization information?");
9210 if (MSInfo->getPointOfInstantiation().isInvalid() &&
9211 MSInfo->getTemplateSpecializationKind()== TSK_ImplicitInstantiation) {
9212 MSInfo->setPointOfInstantiation(Loc);
Sebastian Redlf79a7192011-04-29 08:19:30 +00009213 // This is a modification of an existing AST node. Notify listeners.
9214 if (ASTMutationListener *L = getASTMutationListener())
9215 L->StaticDataMemberInstantiated(Var);
Chandler Carruth62c78d52010-08-25 08:44:16 +00009216 PendingInstantiations.push_back(std::make_pair(Var, Loc));
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009217 }
9218 }
Mike Stump1eb44332009-09-09 15:08:12 +00009219
John McCall77efc682011-02-21 19:25:48 +00009220 // Keep track of used but undefined variables. We make a hole in
9221 // the warning for static const data members with in-line
9222 // initializers.
John McCall15e310a2011-02-19 02:53:41 +00009223 if (Var->hasDefinition() == VarDecl::DeclarationOnly
John McCall77efc682011-02-21 19:25:48 +00009224 && Var->getLinkage() != ExternalLinkage
9225 && !(Var->isStaticDataMember() && Var->hasInit())) {
John McCall15e310a2011-02-19 02:53:41 +00009226 SourceLocation &old = UndefinedInternals[Var->getCanonicalDecl()];
9227 if (old.isInvalid()) old = Loc;
9228 }
Douglas Gregor7caa6822009-07-24 20:34:43 +00009229
Douglas Gregore0762c92009-06-19 23:52:42 +00009230 D->setUsed(true);
Douglas Gregor7caa6822009-07-24 20:34:43 +00009231 return;
Sam Weinigcce6ebc2009-09-11 03:29:30 +00009232 }
Douglas Gregore0762c92009-06-19 23:52:42 +00009233}
Anders Carlsson8c8d9192009-10-09 23:51:55 +00009234
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009235namespace {
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009236 // Mark all of the declarations referenced
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009237 // FIXME: Not fully implemented yet! We need to have a better understanding
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009238 // of when we're entering
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009239 class MarkReferencedDecls : public RecursiveASTVisitor<MarkReferencedDecls> {
9240 Sema &S;
9241 SourceLocation Loc;
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009242
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009243 public:
9244 typedef RecursiveASTVisitor<MarkReferencedDecls> Inherited;
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009245
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009246 MarkReferencedDecls(Sema &S, SourceLocation Loc) : S(S), Loc(Loc) { }
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009247
9248 bool TraverseTemplateArgument(const TemplateArgument &Arg);
9249 bool TraverseRecordType(RecordType *T);
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009250 };
9251}
9252
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009253bool MarkReferencedDecls::TraverseTemplateArgument(
9254 const TemplateArgument &Arg) {
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009255 if (Arg.getKind() == TemplateArgument::Declaration) {
9256 S.MarkDeclarationReferenced(Loc, Arg.getAsDecl());
9257 }
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009258
9259 return Inherited::TraverseTemplateArgument(Arg);
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009260}
9261
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009262bool MarkReferencedDecls::TraverseRecordType(RecordType *T) {
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009263 if (ClassTemplateSpecializationDecl *Spec
9264 = dyn_cast<ClassTemplateSpecializationDecl>(T->getDecl())) {
9265 const TemplateArgumentList &Args = Spec->getTemplateArgs();
Douglas Gregor910f8002010-11-07 23:05:16 +00009266 return TraverseTemplateArguments(Args.data(), Args.size());
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009267 }
9268
Chandler Carruthe3e210c2010-06-10 10:31:57 +00009269 return true;
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009270}
9271
9272void Sema::MarkDeclarationsReferencedInType(SourceLocation Loc, QualType T) {
9273 MarkReferencedDecls Marker(*this, Loc);
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009274 Marker.TraverseType(Context.getCanonicalType(T));
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009275}
9276
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009277namespace {
9278 /// \brief Helper class that marks all of the declarations referenced by
9279 /// potentially-evaluated subexpressions as "referenced".
9280 class EvaluatedExprMarker : public EvaluatedExprVisitor<EvaluatedExprMarker> {
9281 Sema &S;
9282
9283 public:
9284 typedef EvaluatedExprVisitor<EvaluatedExprMarker> Inherited;
9285
9286 explicit EvaluatedExprMarker(Sema &S) : Inherited(S.Context), S(S) { }
9287
9288 void VisitDeclRefExpr(DeclRefExpr *E) {
9289 S.MarkDeclarationReferenced(E->getLocation(), E->getDecl());
9290 }
9291
9292 void VisitMemberExpr(MemberExpr *E) {
9293 S.MarkDeclarationReferenced(E->getMemberLoc(), E->getMemberDecl());
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00009294 Inherited::VisitMemberExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009295 }
9296
9297 void VisitCXXNewExpr(CXXNewExpr *E) {
9298 if (E->getConstructor())
9299 S.MarkDeclarationReferenced(E->getLocStart(), E->getConstructor());
9300 if (E->getOperatorNew())
9301 S.MarkDeclarationReferenced(E->getLocStart(), E->getOperatorNew());
9302 if (E->getOperatorDelete())
9303 S.MarkDeclarationReferenced(E->getLocStart(), E->getOperatorDelete());
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00009304 Inherited::VisitCXXNewExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009305 }
9306
9307 void VisitCXXDeleteExpr(CXXDeleteExpr *E) {
9308 if (E->getOperatorDelete())
9309 S.MarkDeclarationReferenced(E->getLocStart(), E->getOperatorDelete());
Douglas Gregor5833b0b2010-09-14 22:55:20 +00009310 QualType Destroyed = S.Context.getBaseElementType(E->getDestroyedType());
9311 if (const RecordType *DestroyedRec = Destroyed->getAs<RecordType>()) {
9312 CXXRecordDecl *Record = cast<CXXRecordDecl>(DestroyedRec->getDecl());
9313 S.MarkDeclarationReferenced(E->getLocStart(),
9314 S.LookupDestructor(Record));
9315 }
9316
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00009317 Inherited::VisitCXXDeleteExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009318 }
9319
9320 void VisitCXXConstructExpr(CXXConstructExpr *E) {
9321 S.MarkDeclarationReferenced(E->getLocStart(), E->getConstructor());
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00009322 Inherited::VisitCXXConstructExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009323 }
9324
9325 void VisitBlockDeclRefExpr(BlockDeclRefExpr *E) {
9326 S.MarkDeclarationReferenced(E->getLocation(), E->getDecl());
9327 }
Douglas Gregor102ff972010-10-19 17:17:35 +00009328
9329 void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *E) {
9330 Visit(E->getExpr());
9331 }
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009332 };
9333}
9334
9335/// \brief Mark any declarations that appear within this expression or any
9336/// potentially-evaluated subexpressions as "referenced".
9337void Sema::MarkDeclarationsReferencedInExpr(Expr *E) {
9338 EvaluatedExprMarker(*this).Visit(E);
9339}
9340
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009341/// \brief Emit a diagnostic that describes an effect on the run-time behavior
9342/// of the program being compiled.
9343///
9344/// This routine emits the given diagnostic when the code currently being
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009345/// type-checked is "potentially evaluated", meaning that there is a
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009346/// possibility that the code will actually be executable. Code in sizeof()
9347/// expressions, code used only during overload resolution, etc., are not
9348/// potentially evaluated. This routine will suppress such diagnostics or,
9349/// in the absolutely nutty case of potentially potentially evaluated
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009350/// expressions (C++ typeid), queue the diagnostic to potentially emit it
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009351/// later.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009352///
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009353/// This routine should be used for all diagnostics that describe the run-time
9354/// behavior of a program, such as passing a non-POD value through an ellipsis.
9355/// Failure to do so will likely result in spurious diagnostics or failures
9356/// during overload resolution or within sizeof/alignof/typeof/typeid.
Ted Kremenek762696f2011-02-23 01:51:43 +00009357bool Sema::DiagRuntimeBehavior(SourceLocation Loc, const Stmt *stmt,
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009358 const PartialDiagnostic &PD) {
John McCallf85e1932011-06-15 23:02:42 +00009359 switch (ExprEvalContexts.back().Context) {
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009360 case Unevaluated:
9361 // The argument will never be evaluated, so don't complain.
9362 break;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009363
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009364 case PotentiallyEvaluated:
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009365 case PotentiallyEvaluatedIfUsed:
Ted Kremenek351ba912011-02-23 01:52:04 +00009366 if (stmt && getCurFunctionOrMethodDecl()) {
9367 FunctionScopes.back()->PossiblyUnreachableDiags.
9368 push_back(sema::PossiblyUnreachableDiag(PD, Loc, stmt));
9369 }
9370 else
9371 Diag(Loc, PD);
9372
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009373 return true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009374
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009375 case PotentiallyPotentiallyEvaluated:
9376 ExprEvalContexts.back().addDiagnostic(Loc, PD);
9377 break;
9378 }
9379
9380 return false;
9381}
9382
Anders Carlsson8c8d9192009-10-09 23:51:55 +00009383bool Sema::CheckCallReturnType(QualType ReturnType, SourceLocation Loc,
9384 CallExpr *CE, FunctionDecl *FD) {
9385 if (ReturnType->isVoidType() || !ReturnType->isIncompleteType())
9386 return false;
9387
9388 PartialDiagnostic Note =
9389 FD ? PDiag(diag::note_function_with_incomplete_return_type_declared_here)
9390 << FD->getDeclName() : PDiag();
9391 SourceLocation NoteLoc = FD ? FD->getLocation() : SourceLocation();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009392
Anders Carlsson8c8d9192009-10-09 23:51:55 +00009393 if (RequireCompleteType(Loc, ReturnType,
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009394 FD ?
Anders Carlsson8c8d9192009-10-09 23:51:55 +00009395 PDiag(diag::err_call_function_incomplete_return)
9396 << CE->getSourceRange() << FD->getDeclName() :
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009397 PDiag(diag::err_call_incomplete_return)
Anders Carlsson8c8d9192009-10-09 23:51:55 +00009398 << CE->getSourceRange(),
9399 std::make_pair(NoteLoc, Note)))
9400 return true;
9401
9402 return false;
9403}
9404
Douglas Gregor92c3a042011-01-19 16:50:08 +00009405// Diagnose the s/=/==/ and s/\|=/!=/ typos. Note that adding parentheses
John McCall5a881bb2009-10-12 21:59:07 +00009406// will prevent this condition from triggering, which is what we want.
9407void Sema::DiagnoseAssignmentAsCondition(Expr *E) {
9408 SourceLocation Loc;
9409
John McCalla52ef082009-11-11 02:41:58 +00009410 unsigned diagnostic = diag::warn_condition_is_assignment;
Douglas Gregor92c3a042011-01-19 16:50:08 +00009411 bool IsOrAssign = false;
John McCalla52ef082009-11-11 02:41:58 +00009412
John McCall5a881bb2009-10-12 21:59:07 +00009413 if (isa<BinaryOperator>(E)) {
9414 BinaryOperator *Op = cast<BinaryOperator>(E);
Douglas Gregor92c3a042011-01-19 16:50:08 +00009415 if (Op->getOpcode() != BO_Assign && Op->getOpcode() != BO_OrAssign)
John McCall5a881bb2009-10-12 21:59:07 +00009416 return;
9417
Douglas Gregor92c3a042011-01-19 16:50:08 +00009418 IsOrAssign = Op->getOpcode() == BO_OrAssign;
9419
John McCallc8d8ac52009-11-12 00:06:05 +00009420 // Greylist some idioms by putting them into a warning subcategory.
9421 if (ObjCMessageExpr *ME
9422 = dyn_cast<ObjCMessageExpr>(Op->getRHS()->IgnoreParenCasts())) {
9423 Selector Sel = ME->getSelector();
9424
John McCallc8d8ac52009-11-12 00:06:05 +00009425 // self = [<foo> init...]
Douglas Gregor813d8342011-02-18 22:29:55 +00009426 if (isSelfExpr(Op->getLHS()) && Sel.getNameForSlot(0).startswith("init"))
John McCallc8d8ac52009-11-12 00:06:05 +00009427 diagnostic = diag::warn_condition_is_idiomatic_assignment;
9428
9429 // <foo> = [<bar> nextObject]
Douglas Gregor813d8342011-02-18 22:29:55 +00009430 else if (Sel.isUnarySelector() && Sel.getNameForSlot(0) == "nextObject")
John McCallc8d8ac52009-11-12 00:06:05 +00009431 diagnostic = diag::warn_condition_is_idiomatic_assignment;
9432 }
John McCalla52ef082009-11-11 02:41:58 +00009433
John McCall5a881bb2009-10-12 21:59:07 +00009434 Loc = Op->getOperatorLoc();
9435 } else if (isa<CXXOperatorCallExpr>(E)) {
9436 CXXOperatorCallExpr *Op = cast<CXXOperatorCallExpr>(E);
Douglas Gregor92c3a042011-01-19 16:50:08 +00009437 if (Op->getOperator() != OO_Equal && Op->getOperator() != OO_PipeEqual)
John McCall5a881bb2009-10-12 21:59:07 +00009438 return;
9439
Douglas Gregor92c3a042011-01-19 16:50:08 +00009440 IsOrAssign = Op->getOperator() == OO_PipeEqual;
John McCall5a881bb2009-10-12 21:59:07 +00009441 Loc = Op->getOperatorLoc();
9442 } else {
9443 // Not an assignment.
9444 return;
9445 }
9446
Douglas Gregor55b38842010-04-14 16:09:52 +00009447 Diag(Loc, diagnostic) << E->getSourceRange();
Douglas Gregor92c3a042011-01-19 16:50:08 +00009448
Argyrios Kyrtzidisabdd3b32011-04-25 23:01:29 +00009449 SourceLocation Open = E->getSourceRange().getBegin();
9450 SourceLocation Close = PP.getLocForEndOfToken(E->getSourceRange().getEnd());
9451 Diag(Loc, diag::note_condition_assign_silence)
9452 << FixItHint::CreateInsertion(Open, "(")
9453 << FixItHint::CreateInsertion(Close, ")");
9454
Douglas Gregor92c3a042011-01-19 16:50:08 +00009455 if (IsOrAssign)
9456 Diag(Loc, diag::note_condition_or_assign_to_comparison)
9457 << FixItHint::CreateReplacement(Loc, "!=");
9458 else
9459 Diag(Loc, diag::note_condition_assign_to_comparison)
9460 << FixItHint::CreateReplacement(Loc, "==");
John McCall5a881bb2009-10-12 21:59:07 +00009461}
9462
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +00009463/// \brief Redundant parentheses over an equality comparison can indicate
9464/// that the user intended an assignment used as condition.
9465void Sema::DiagnoseEqualityWithExtraParens(ParenExpr *parenE) {
Argyrios Kyrtzidiscf1620a2011-02-01 22:23:56 +00009466 // Don't warn if the parens came from a macro.
9467 SourceLocation parenLoc = parenE->getLocStart();
9468 if (parenLoc.isInvalid() || parenLoc.isMacroID())
9469 return;
Argyrios Kyrtzidis170a6a22011-03-28 23:52:04 +00009470 // Don't warn for dependent expressions.
9471 if (parenE->isTypeDependent())
9472 return;
Argyrios Kyrtzidiscf1620a2011-02-01 22:23:56 +00009473
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +00009474 Expr *E = parenE->IgnoreParens();
9475
9476 if (BinaryOperator *opE = dyn_cast<BinaryOperator>(E))
Argyrios Kyrtzidis70f23302011-02-01 19:32:59 +00009477 if (opE->getOpcode() == BO_EQ &&
9478 opE->getLHS()->IgnoreParenImpCasts()->isModifiableLvalue(Context)
9479 == Expr::MLV_Valid) {
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +00009480 SourceLocation Loc = opE->getOperatorLoc();
Ted Kremenek006ae382011-02-01 22:36:09 +00009481
Ted Kremenekf7275cd2011-02-02 02:20:30 +00009482 Diag(Loc, diag::warn_equality_with_extra_parens) << E->getSourceRange();
Ted Kremenekf7275cd2011-02-02 02:20:30 +00009483 Diag(Loc, diag::note_equality_comparison_silence)
9484 << FixItHint::CreateRemoval(parenE->getSourceRange().getBegin())
9485 << FixItHint::CreateRemoval(parenE->getSourceRange().getEnd());
Argyrios Kyrtzidisabdd3b32011-04-25 23:01:29 +00009486 Diag(Loc, diag::note_equality_comparison_to_assign)
9487 << FixItHint::CreateReplacement(Loc, "=");
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +00009488 }
9489}
9490
John Wiegley429bb272011-04-08 18:41:53 +00009491ExprResult Sema::CheckBooleanCondition(Expr *E, SourceLocation Loc) {
John McCall5a881bb2009-10-12 21:59:07 +00009492 DiagnoseAssignmentAsCondition(E);
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +00009493 if (ParenExpr *parenE = dyn_cast<ParenExpr>(E))
9494 DiagnoseEqualityWithExtraParens(parenE);
John McCall5a881bb2009-10-12 21:59:07 +00009495
John McCall864c0412011-04-26 20:42:42 +00009496 ExprResult result = CheckPlaceholderExpr(E);
9497 if (result.isInvalid()) return ExprError();
9498 E = result.take();
Argyrios Kyrtzidis11ab7902010-11-01 18:49:26 +00009499
John McCall864c0412011-04-26 20:42:42 +00009500 if (!E->isTypeDependent()) {
John McCallf6a16482010-12-04 03:47:34 +00009501 if (getLangOptions().CPlusPlus)
9502 return CheckCXXBooleanCondition(E); // C++ 6.4p4
9503
John Wiegley429bb272011-04-08 18:41:53 +00009504 ExprResult ERes = DefaultFunctionArrayLvalueConversion(E);
9505 if (ERes.isInvalid())
9506 return ExprError();
9507 E = ERes.take();
John McCallabc56c72010-12-04 06:09:13 +00009508
9509 QualType T = E->getType();
John Wiegley429bb272011-04-08 18:41:53 +00009510 if (!T->isScalarType()) { // C99 6.8.4.1p1
9511 Diag(Loc, diag::err_typecheck_statement_requires_scalar)
9512 << T << E->getSourceRange();
9513 return ExprError();
9514 }
John McCall5a881bb2009-10-12 21:59:07 +00009515 }
9516
John Wiegley429bb272011-04-08 18:41:53 +00009517 return Owned(E);
John McCall5a881bb2009-10-12 21:59:07 +00009518}
Douglas Gregor586596f2010-05-06 17:25:47 +00009519
John McCall60d7b3a2010-08-24 06:29:42 +00009520ExprResult Sema::ActOnBooleanCondition(Scope *S, SourceLocation Loc,
9521 Expr *Sub) {
Douglas Gregoreecf38f2010-05-06 21:39:56 +00009522 if (!Sub)
Douglas Gregor586596f2010-05-06 17:25:47 +00009523 return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00009524
9525 return CheckBooleanCondition(Sub, Loc);
Douglas Gregor586596f2010-05-06 17:25:47 +00009526}
John McCall2a984ca2010-10-12 00:20:44 +00009527
John McCall1de4d4e2011-04-07 08:22:57 +00009528namespace {
John McCall755d8492011-04-12 00:42:48 +00009529 /// A visitor for rebuilding a call to an __unknown_any expression
9530 /// to have an appropriate type.
9531 struct RebuildUnknownAnyFunction
9532 : StmtVisitor<RebuildUnknownAnyFunction, ExprResult> {
9533
9534 Sema &S;
9535
9536 RebuildUnknownAnyFunction(Sema &S) : S(S) {}
9537
9538 ExprResult VisitStmt(Stmt *S) {
9539 llvm_unreachable("unexpected statement!");
9540 return ExprError();
9541 }
9542
9543 ExprResult VisitExpr(Expr *expr) {
9544 S.Diag(expr->getExprLoc(), diag::err_unsupported_unknown_any_call)
9545 << expr->getSourceRange();
9546 return ExprError();
9547 }
9548
9549 /// Rebuild an expression which simply semantically wraps another
9550 /// expression which it shares the type and value kind of.
9551 template <class T> ExprResult rebuildSugarExpr(T *expr) {
9552 ExprResult subResult = Visit(expr->getSubExpr());
9553 if (subResult.isInvalid()) return ExprError();
9554
9555 Expr *subExpr = subResult.take();
9556 expr->setSubExpr(subExpr);
9557 expr->setType(subExpr->getType());
9558 expr->setValueKind(subExpr->getValueKind());
9559 assert(expr->getObjectKind() == OK_Ordinary);
9560 return expr;
9561 }
9562
9563 ExprResult VisitParenExpr(ParenExpr *paren) {
9564 return rebuildSugarExpr(paren);
9565 }
9566
9567 ExprResult VisitUnaryExtension(UnaryOperator *op) {
9568 return rebuildSugarExpr(op);
9569 }
9570
9571 ExprResult VisitUnaryAddrOf(UnaryOperator *op) {
9572 ExprResult subResult = Visit(op->getSubExpr());
9573 if (subResult.isInvalid()) return ExprError();
9574
9575 Expr *subExpr = subResult.take();
9576 op->setSubExpr(subExpr);
9577 op->setType(S.Context.getPointerType(subExpr->getType()));
9578 assert(op->getValueKind() == VK_RValue);
9579 assert(op->getObjectKind() == OK_Ordinary);
9580 return op;
9581 }
9582
9583 ExprResult resolveDecl(Expr *expr, ValueDecl *decl) {
9584 if (!isa<FunctionDecl>(decl)) return VisitExpr(expr);
9585
9586 expr->setType(decl->getType());
9587
9588 assert(expr->getValueKind() == VK_RValue);
9589 if (S.getLangOptions().CPlusPlus &&
9590 !(isa<CXXMethodDecl>(decl) &&
9591 cast<CXXMethodDecl>(decl)->isInstance()))
9592 expr->setValueKind(VK_LValue);
9593
9594 return expr;
9595 }
9596
9597 ExprResult VisitMemberExpr(MemberExpr *mem) {
9598 return resolveDecl(mem, mem->getMemberDecl());
9599 }
9600
9601 ExprResult VisitDeclRefExpr(DeclRefExpr *ref) {
9602 return resolveDecl(ref, ref->getDecl());
9603 }
9604 };
9605}
9606
9607/// Given a function expression of unknown-any type, try to rebuild it
9608/// to have a function type.
9609static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *fn) {
9610 ExprResult result = RebuildUnknownAnyFunction(S).Visit(fn);
9611 if (result.isInvalid()) return ExprError();
9612 return S.DefaultFunctionArrayConversion(result.take());
9613}
9614
9615namespace {
John McCall379b5152011-04-11 07:02:50 +00009616 /// A visitor for rebuilding an expression of type __unknown_anytype
9617 /// into one which resolves the type directly on the referring
9618 /// expression. Strict preservation of the original source
9619 /// structure is not a goal.
John McCall1de4d4e2011-04-07 08:22:57 +00009620 struct RebuildUnknownAnyExpr
John McCalla5fc4722011-04-09 22:50:59 +00009621 : StmtVisitor<RebuildUnknownAnyExpr, ExprResult> {
John McCall1de4d4e2011-04-07 08:22:57 +00009622
9623 Sema &S;
9624
9625 /// The current destination type.
9626 QualType DestType;
9627
9628 RebuildUnknownAnyExpr(Sema &S, QualType castType)
9629 : S(S), DestType(castType) {}
9630
John McCalla5fc4722011-04-09 22:50:59 +00009631 ExprResult VisitStmt(Stmt *S) {
John McCall379b5152011-04-11 07:02:50 +00009632 llvm_unreachable("unexpected statement!");
John McCalla5fc4722011-04-09 22:50:59 +00009633 return ExprError();
John McCall1de4d4e2011-04-07 08:22:57 +00009634 }
9635
John McCall379b5152011-04-11 07:02:50 +00009636 ExprResult VisitExpr(Expr *expr) {
9637 S.Diag(expr->getExprLoc(), diag::err_unsupported_unknown_any_expr)
9638 << expr->getSourceRange();
9639 return ExprError();
John McCall1de4d4e2011-04-07 08:22:57 +00009640 }
9641
John McCall379b5152011-04-11 07:02:50 +00009642 ExprResult VisitCallExpr(CallExpr *call);
9643 ExprResult VisitObjCMessageExpr(ObjCMessageExpr *message);
9644
John McCalla5fc4722011-04-09 22:50:59 +00009645 /// Rebuild an expression which simply semantically wraps another
9646 /// expression which it shares the type and value kind of.
9647 template <class T> ExprResult rebuildSugarExpr(T *expr) {
9648 ExprResult subResult = Visit(expr->getSubExpr());
John McCall755d8492011-04-12 00:42:48 +00009649 if (subResult.isInvalid()) return ExprError();
John McCalla5fc4722011-04-09 22:50:59 +00009650 Expr *subExpr = subResult.take();
9651 expr->setSubExpr(subExpr);
9652 expr->setType(subExpr->getType());
9653 expr->setValueKind(subExpr->getValueKind());
9654 assert(expr->getObjectKind() == OK_Ordinary);
9655 return expr;
9656 }
John McCall1de4d4e2011-04-07 08:22:57 +00009657
John McCalla5fc4722011-04-09 22:50:59 +00009658 ExprResult VisitParenExpr(ParenExpr *paren) {
9659 return rebuildSugarExpr(paren);
9660 }
9661
9662 ExprResult VisitUnaryExtension(UnaryOperator *op) {
9663 return rebuildSugarExpr(op);
9664 }
9665
John McCall755d8492011-04-12 00:42:48 +00009666 ExprResult VisitUnaryAddrOf(UnaryOperator *op) {
9667 const PointerType *ptr = DestType->getAs<PointerType>();
9668 if (!ptr) {
9669 S.Diag(op->getOperatorLoc(), diag::err_unknown_any_addrof)
9670 << op->getSourceRange();
9671 return ExprError();
9672 }
9673 assert(op->getValueKind() == VK_RValue);
9674 assert(op->getObjectKind() == OK_Ordinary);
9675 op->setType(DestType);
9676
9677 // Build the sub-expression as if it were an object of the pointee type.
9678 DestType = ptr->getPointeeType();
9679 ExprResult subResult = Visit(op->getSubExpr());
9680 if (subResult.isInvalid()) return ExprError();
9681 op->setSubExpr(subResult.take());
9682 return op;
9683 }
9684
John McCall379b5152011-04-11 07:02:50 +00009685 ExprResult VisitImplicitCastExpr(ImplicitCastExpr *ice);
John McCalla5fc4722011-04-09 22:50:59 +00009686
John McCall755d8492011-04-12 00:42:48 +00009687 ExprResult resolveDecl(Expr *expr, ValueDecl *decl);
John McCalla5fc4722011-04-09 22:50:59 +00009688
John McCall755d8492011-04-12 00:42:48 +00009689 ExprResult VisitMemberExpr(MemberExpr *mem) {
9690 return resolveDecl(mem, mem->getMemberDecl());
9691 }
John McCalla5fc4722011-04-09 22:50:59 +00009692
9693 ExprResult VisitDeclRefExpr(DeclRefExpr *ref) {
John McCall379b5152011-04-11 07:02:50 +00009694 return resolveDecl(ref, ref->getDecl());
John McCall1de4d4e2011-04-07 08:22:57 +00009695 }
9696 };
9697}
9698
John McCall379b5152011-04-11 07:02:50 +00009699/// Rebuilds a call expression which yielded __unknown_anytype.
9700ExprResult RebuildUnknownAnyExpr::VisitCallExpr(CallExpr *call) {
9701 Expr *callee = call->getCallee();
9702
9703 enum FnKind {
John McCallf5307512011-04-27 00:36:17 +00009704 FK_MemberFunction,
John McCall379b5152011-04-11 07:02:50 +00009705 FK_FunctionPointer,
9706 FK_BlockPointer
9707 };
9708
9709 FnKind kind;
9710 QualType type = callee->getType();
John McCallf5307512011-04-27 00:36:17 +00009711 if (type == S.Context.BoundMemberTy) {
9712 assert(isa<CXXMemberCallExpr>(call) || isa<CXXOperatorCallExpr>(call));
9713 kind = FK_MemberFunction;
9714 type = Expr::findBoundMemberType(callee);
John McCall379b5152011-04-11 07:02:50 +00009715 } else if (const PointerType *ptr = type->getAs<PointerType>()) {
9716 type = ptr->getPointeeType();
9717 kind = FK_FunctionPointer;
9718 } else {
9719 type = type->castAs<BlockPointerType>()->getPointeeType();
9720 kind = FK_BlockPointer;
9721 }
9722 const FunctionType *fnType = type->castAs<FunctionType>();
9723
9724 // Verify that this is a legal result type of a function.
9725 if (DestType->isArrayType() || DestType->isFunctionType()) {
9726 unsigned diagID = diag::err_func_returning_array_function;
9727 if (kind == FK_BlockPointer)
9728 diagID = diag::err_block_returning_array_function;
9729
9730 S.Diag(call->getExprLoc(), diagID)
9731 << DestType->isFunctionType() << DestType;
9732 return ExprError();
9733 }
9734
9735 // Otherwise, go ahead and set DestType as the call's result.
9736 call->setType(DestType.getNonLValueExprType(S.Context));
9737 call->setValueKind(Expr::getValueKindForType(DestType));
9738 assert(call->getObjectKind() == OK_Ordinary);
9739
9740 // Rebuild the function type, replacing the result type with DestType.
9741 if (const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(fnType))
9742 DestType = S.Context.getFunctionType(DestType,
9743 proto->arg_type_begin(),
9744 proto->getNumArgs(),
9745 proto->getExtProtoInfo());
9746 else
9747 DestType = S.Context.getFunctionNoProtoType(DestType,
9748 fnType->getExtInfo());
9749
9750 // Rebuild the appropriate pointer-to-function type.
9751 switch (kind) {
John McCallf5307512011-04-27 00:36:17 +00009752 case FK_MemberFunction:
John McCall379b5152011-04-11 07:02:50 +00009753 // Nothing to do.
9754 break;
9755
9756 case FK_FunctionPointer:
9757 DestType = S.Context.getPointerType(DestType);
9758 break;
9759
9760 case FK_BlockPointer:
9761 DestType = S.Context.getBlockPointerType(DestType);
9762 break;
9763 }
9764
9765 // Finally, we can recurse.
9766 ExprResult calleeResult = Visit(callee);
9767 if (!calleeResult.isUsable()) return ExprError();
9768 call->setCallee(calleeResult.take());
9769
9770 // Bind a temporary if necessary.
9771 return S.MaybeBindToTemporary(call);
9772}
9773
9774ExprResult RebuildUnknownAnyExpr::VisitObjCMessageExpr(ObjCMessageExpr *msg) {
John McCall755d8492011-04-12 00:42:48 +00009775 // Verify that this is a legal result type of a call.
9776 if (DestType->isArrayType() || DestType->isFunctionType()) {
9777 S.Diag(msg->getExprLoc(), diag::err_func_returning_array_function)
9778 << DestType->isFunctionType() << DestType;
9779 return ExprError();
John McCall379b5152011-04-11 07:02:50 +00009780 }
9781
John McCall48218c62011-07-13 17:56:40 +00009782 // Rewrite the method result type if available.
9783 if (ObjCMethodDecl *method = msg->getMethodDecl()) {
9784 assert(method->getResultType() == S.Context.UnknownAnyTy);
9785 method->setResultType(DestType);
9786 }
John McCall755d8492011-04-12 00:42:48 +00009787
John McCall379b5152011-04-11 07:02:50 +00009788 // Change the type of the message.
John McCall755d8492011-04-12 00:42:48 +00009789 msg->setType(DestType.getNonReferenceType());
9790 msg->setValueKind(Expr::getValueKindForType(DestType));
John McCall379b5152011-04-11 07:02:50 +00009791
John McCall755d8492011-04-12 00:42:48 +00009792 return S.MaybeBindToTemporary(msg);
John McCall379b5152011-04-11 07:02:50 +00009793}
9794
9795ExprResult RebuildUnknownAnyExpr::VisitImplicitCastExpr(ImplicitCastExpr *ice) {
John McCall755d8492011-04-12 00:42:48 +00009796 // The only case we should ever see here is a function-to-pointer decay.
John McCall379b5152011-04-11 07:02:50 +00009797 assert(ice->getCastKind() == CK_FunctionToPointerDecay);
John McCall379b5152011-04-11 07:02:50 +00009798 assert(ice->getValueKind() == VK_RValue);
9799 assert(ice->getObjectKind() == OK_Ordinary);
9800
John McCall755d8492011-04-12 00:42:48 +00009801 ice->setType(DestType);
9802
John McCall379b5152011-04-11 07:02:50 +00009803 // Rebuild the sub-expression as the pointee (function) type.
9804 DestType = DestType->castAs<PointerType>()->getPointeeType();
9805
9806 ExprResult result = Visit(ice->getSubExpr());
9807 if (!result.isUsable()) return ExprError();
9808
9809 ice->setSubExpr(result.take());
9810 return S.Owned(ice);
9811}
9812
John McCall755d8492011-04-12 00:42:48 +00009813ExprResult RebuildUnknownAnyExpr::resolveDecl(Expr *expr, ValueDecl *decl) {
John McCall379b5152011-04-11 07:02:50 +00009814 ExprValueKind valueKind = VK_LValue;
John McCall379b5152011-04-11 07:02:50 +00009815 QualType type = DestType;
9816
9817 // We know how to make this work for certain kinds of decls:
9818
9819 // - functions
John McCall755d8492011-04-12 00:42:48 +00009820 if (FunctionDecl *fn = dyn_cast<FunctionDecl>(decl)) {
John McCall379b5152011-04-11 07:02:50 +00009821 // This is true because FunctionDecls must always have function
9822 // type, so we can't be resolving the entire thing at once.
9823 assert(type->isFunctionType());
9824
John McCallf5307512011-04-27 00:36:17 +00009825 if (CXXMethodDecl *method = dyn_cast<CXXMethodDecl>(fn))
9826 if (method->isInstance()) {
9827 valueKind = VK_RValue;
9828 type = S.Context.BoundMemberTy;
9829 }
9830
John McCall379b5152011-04-11 07:02:50 +00009831 // Function references aren't l-values in C.
9832 if (!S.getLangOptions().CPlusPlus)
9833 valueKind = VK_RValue;
9834
9835 // - variables
9836 } else if (isa<VarDecl>(decl)) {
John McCall755d8492011-04-12 00:42:48 +00009837 if (const ReferenceType *refTy = type->getAs<ReferenceType>()) {
9838 type = refTy->getPointeeType();
John McCall379b5152011-04-11 07:02:50 +00009839 } else if (type->isFunctionType()) {
John McCall755d8492011-04-12 00:42:48 +00009840 S.Diag(expr->getExprLoc(), diag::err_unknown_any_var_function_type)
9841 << decl << expr->getSourceRange();
9842 return ExprError();
John McCall379b5152011-04-11 07:02:50 +00009843 }
9844
9845 // - nothing else
9846 } else {
9847 S.Diag(expr->getExprLoc(), diag::err_unsupported_unknown_any_decl)
9848 << decl << expr->getSourceRange();
9849 return ExprError();
9850 }
9851
John McCall755d8492011-04-12 00:42:48 +00009852 decl->setType(DestType);
9853 expr->setType(type);
9854 expr->setValueKind(valueKind);
9855 return S.Owned(expr);
John McCall379b5152011-04-11 07:02:50 +00009856}
9857
John McCall1de4d4e2011-04-07 08:22:57 +00009858/// Check a cast of an unknown-any type. We intentionally only
9859/// trigger this for C-style casts.
John Wiegley429bb272011-04-08 18:41:53 +00009860ExprResult Sema::checkUnknownAnyCast(SourceRange typeRange, QualType castType,
9861 Expr *castExpr, CastKind &castKind,
9862 ExprValueKind &VK, CXXCastPath &path) {
John McCall1de4d4e2011-04-07 08:22:57 +00009863 // Rewrite the casted expression from scratch.
John McCalla5fc4722011-04-09 22:50:59 +00009864 ExprResult result = RebuildUnknownAnyExpr(*this, castType).Visit(castExpr);
9865 if (!result.isUsable()) return ExprError();
John McCall1de4d4e2011-04-07 08:22:57 +00009866
John McCalla5fc4722011-04-09 22:50:59 +00009867 castExpr = result.take();
9868 VK = castExpr->getValueKind();
9869 castKind = CK_NoOp;
9870
9871 return castExpr;
John McCall1de4d4e2011-04-07 08:22:57 +00009872}
9873
9874static ExprResult diagnoseUnknownAnyExpr(Sema &S, Expr *e) {
9875 Expr *orig = e;
John McCall379b5152011-04-11 07:02:50 +00009876 unsigned diagID = diag::err_uncasted_use_of_unknown_any;
John McCall1de4d4e2011-04-07 08:22:57 +00009877 while (true) {
9878 e = e->IgnoreParenImpCasts();
John McCall379b5152011-04-11 07:02:50 +00009879 if (CallExpr *call = dyn_cast<CallExpr>(e)) {
John McCall1de4d4e2011-04-07 08:22:57 +00009880 e = call->getCallee();
John McCall379b5152011-04-11 07:02:50 +00009881 diagID = diag::err_uncasted_call_of_unknown_any;
9882 } else {
John McCall1de4d4e2011-04-07 08:22:57 +00009883 break;
John McCall379b5152011-04-11 07:02:50 +00009884 }
John McCall1de4d4e2011-04-07 08:22:57 +00009885 }
9886
John McCall379b5152011-04-11 07:02:50 +00009887 SourceLocation loc;
9888 NamedDecl *d;
9889 if (DeclRefExpr *ref = dyn_cast<DeclRefExpr>(e)) {
9890 loc = ref->getLocation();
9891 d = ref->getDecl();
9892 } else if (MemberExpr *mem = dyn_cast<MemberExpr>(e)) {
9893 loc = mem->getMemberLoc();
9894 d = mem->getMemberDecl();
9895 } else if (ObjCMessageExpr *msg = dyn_cast<ObjCMessageExpr>(e)) {
9896 diagID = diag::err_uncasted_call_of_unknown_any;
9897 loc = msg->getSelectorLoc();
9898 d = msg->getMethodDecl();
9899 assert(d && "unknown method returning __unknown_any?");
9900 } else {
9901 S.Diag(e->getExprLoc(), diag::err_unsupported_unknown_any_expr)
9902 << e->getSourceRange();
9903 return ExprError();
9904 }
9905
9906 S.Diag(loc, diagID) << d << orig->getSourceRange();
John McCall1de4d4e2011-04-07 08:22:57 +00009907
9908 // Never recoverable.
9909 return ExprError();
9910}
9911
John McCall2a984ca2010-10-12 00:20:44 +00009912/// Check for operands with placeholder types and complain if found.
9913/// Returns true if there was an error and no recovery was possible.
John McCallfb8721c2011-04-10 19:13:55 +00009914ExprResult Sema::CheckPlaceholderExpr(Expr *E) {
John McCall1de4d4e2011-04-07 08:22:57 +00009915 // Placeholder types are always *exactly* the appropriate builtin type.
9916 QualType type = E->getType();
John McCall2a984ca2010-10-12 00:20:44 +00009917
John McCall1de4d4e2011-04-07 08:22:57 +00009918 // Overloaded expressions.
9919 if (type == Context.OverloadTy)
9920 return ResolveAndFixSingleFunctionTemplateSpecialization(E, false, true,
Douglas Gregordb2eae62011-03-16 19:16:25 +00009921 E->getSourceRange(),
John McCall1de4d4e2011-04-07 08:22:57 +00009922 QualType(),
9923 diag::err_ovl_unresolvable);
9924
John McCall864c0412011-04-26 20:42:42 +00009925 // Bound member functions.
9926 if (type == Context.BoundMemberTy) {
9927 Diag(E->getLocStart(), diag::err_invalid_use_of_bound_member_func)
9928 << E->getSourceRange();
9929 return ExprError();
9930 }
9931
John McCall1de4d4e2011-04-07 08:22:57 +00009932 // Expressions of unknown type.
9933 if (type == Context.UnknownAnyTy)
9934 return diagnoseUnknownAnyExpr(*this, E);
9935
9936 assert(!type->isPlaceholderType());
9937 return Owned(E);
John McCall2a984ca2010-10-12 00:20:44 +00009938}
Richard Trieubb9b80c2011-04-21 21:44:26 +00009939
9940bool Sema::CheckCaseExpression(Expr *expr) {
9941 if (expr->isTypeDependent())
9942 return true;
9943 if (expr->isValueDependent() || expr->isIntegerConstantExpr(Context))
9944 return expr->getType()->isIntegralOrEnumerationType();
9945 return false;
9946}