1 //===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements semantic analysis for expressions.
12 //===----------------------------------------------------------------------===//
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/DeclObjC.h"
17 #include "clang/AST/ExprCXX.h"
18 #include "clang/AST/ExprObjC.h"
19 #include "clang/AST/DeclTemplate.h"
20 #include "clang/Lex/Preprocessor.h"
21 #include "clang/Lex/LiteralSupport.h"
22 #include "clang/Basic/SourceManager.h"
23 #include "clang/Basic/TargetInfo.h"
24 #include "clang/Parse/DeclSpec.h"
25 #include "clang/Parse/Designator.h"
26 #include "clang/Parse/Scope.h"
27 using namespace clang;
29 /// \brief Determine whether the use of this declaration is valid, and
30 /// emit any corresponding diagnostics.
32 /// This routine diagnoses various problems with referencing
33 /// declarations that can occur when using a declaration. For example,
34 /// it might warn if a deprecated or unavailable declaration is being
35 /// used, or produce an error (and return true) if a C++0x deleted
36 /// function is being used.
38 /// \returns true if there was an error (this declaration cannot be
39 /// referenced), false otherwise.
40 bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc) {
41 // See if the decl is deprecated.
42 if (D->getAttr<DeprecatedAttr>(Context)) {
43 // Implementing deprecated stuff requires referencing deprecated
44 // stuff. Don't warn if we are implementing a deprecated
46 bool isSilenced = false;
48 if (NamedDecl *ND = getCurFunctionOrMethodDecl()) {
49 // If this reference happens *in* a deprecated function or method, don't
51 isSilenced = ND->getAttr<DeprecatedAttr>(Context);
53 // If this is an Objective-C method implementation, check to see if the
54 // method was deprecated on the declaration, not the definition.
55 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(ND)) {
56 // The semantic decl context of a ObjCMethodDecl is the
57 // ObjCImplementationDecl.
58 if (ObjCImplementationDecl *Impl
59 = dyn_cast<ObjCImplementationDecl>(MD->getParent())) {
61 MD = Impl->getClassInterface()->getMethod(Context,
63 MD->isInstanceMethod());
64 isSilenced |= MD && MD->getAttr<DeprecatedAttr>(Context);
70 Diag(Loc, diag::warn_deprecated) << D->getDeclName();
73 // See if this is a deleted function.
74 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
75 if (FD->isDeleted()) {
76 Diag(Loc, diag::err_deleted_function_use);
77 Diag(D->getLocation(), diag::note_unavailable_here) << true;
82 // See if the decl is unavailable
83 if (D->getAttr<UnavailableAttr>(Context)) {
84 Diag(Loc, diag::warn_unavailable) << D->getDeclName();
85 Diag(D->getLocation(), diag::note_unavailable_here) << 0;
91 /// DiagnoseSentinelCalls - This routine checks on method dispatch calls
92 /// (and other functions in future), which have been declared with sentinel
93 /// attribute. It warns if call does not have the sentinel argument.
95 void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc,
96 Expr **Args, unsigned NumArgs)
98 const SentinelAttr *attr = D->getAttr<SentinelAttr>(Context);
101 int sentinelPos = attr->getSentinel();
102 int nullPos = attr->getNullPos();
104 // FIXME. ObjCMethodDecl and FunctionDecl need be derived from the same common
105 // base class. Then we won't be needing two versions of the same code.
107 bool warnNotEnoughArgs = false;
109 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
110 // skip over named parameters.
111 ObjCMethodDecl::param_iterator P, E = MD->param_end();
112 for (P = MD->param_begin(); (P != E && i < NumArgs); ++P) {
118 warnNotEnoughArgs = (P != E || i >= NumArgs);
121 else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
122 // skip over named parameters.
123 ObjCMethodDecl::param_iterator P, E = FD->param_end();
124 for (P = FD->param_begin(); (P != E && i < NumArgs); ++P) {
130 warnNotEnoughArgs = (P != E || i >= NumArgs);
132 else if (VarDecl *V = dyn_cast<VarDecl>(D)) {
133 // block or function pointer call.
134 QualType Ty = V->getType();
135 if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) {
136 const FunctionType *FT = Ty->isFunctionPointerType()
137 ? Ty->getAsPointerType()->getPointeeType()->getAsFunctionType()
138 : Ty->getAsBlockPointerType()->getPointeeType()->getAsFunctionType();
139 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FT)) {
140 unsigned NumArgsInProto = Proto->getNumArgs();
142 for (k = 0; (k != NumArgsInProto && i < NumArgs); k++) {
148 warnNotEnoughArgs = (k != NumArgsInProto || i >= NumArgs);
150 if (Ty->isBlockPointerType())
159 if (warnNotEnoughArgs) {
160 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName();
161 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod;
165 while (sentinelPos > 0 && i < NumArgs-1) {
169 if (sentinelPos > 0) {
170 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName();
171 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod;
174 while (i < NumArgs-1) {
178 Expr *sentinelExpr = Args[sentinel];
179 if (sentinelExpr && (!sentinelExpr->getType()->isPointerType() ||
180 !sentinelExpr->isNullPointerConstant(Context))) {
181 Diag(Loc, diag::warn_missing_sentinel) << isMethod;
182 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod;
187 SourceRange Sema::getExprRange(ExprTy *E) const {
188 Expr *Ex = (Expr *)E;
189 return Ex? Ex->getSourceRange() : SourceRange();
192 //===----------------------------------------------------------------------===//
193 // Standard Promotions and Conversions
194 //===----------------------------------------------------------------------===//
196 /// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4).
197 void Sema::DefaultFunctionArrayConversion(Expr *&E) {
198 QualType Ty = E->getType();
199 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type");
201 if (Ty->isFunctionType())
202 ImpCastExprToType(E, Context.getPointerType(Ty));
203 else if (Ty->isArrayType()) {
204 // In C90 mode, arrays only promote to pointers if the array expression is
205 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has
206 // type 'array of type' is converted to an expression that has type 'pointer
207 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression
208 // that has type 'array of type' ...". The relevant change is "an lvalue"
209 // (C90) to "an expression" (C99).
212 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of
213 // T" can be converted to an rvalue of type "pointer to T".
215 if (getLangOptions().C99 || getLangOptions().CPlusPlus ||
216 E->isLvalue(Context) == Expr::LV_Valid)
217 ImpCastExprToType(E, Context.getArrayDecayedType(Ty));
221 /// \brief Whether this is a promotable bitfield reference according
222 /// to C99 6.3.1.1p2, bullet 2.
224 /// \returns the type this bit-field will promote to, or NULL if no
225 /// promotion occurs.
226 static QualType isPromotableBitField(Expr *E, ASTContext &Context) {
227 FieldDecl *Field = E->getBitField();
231 const BuiltinType *BT = Field->getType()->getAsBuiltinType();
235 if (BT->getKind() != BuiltinType::Bool &&
236 BT->getKind() != BuiltinType::Int &&
237 BT->getKind() != BuiltinType::UInt)
240 llvm::APSInt BitWidthAP;
241 if (!Field->getBitWidth()->isIntegerConstantExpr(BitWidthAP, Context))
244 uint64_t BitWidth = BitWidthAP.getZExtValue();
245 uint64_t IntSize = Context.getTypeSize(Context.IntTy);
246 if (BitWidth < IntSize ||
247 (Field->getType()->isSignedIntegerType() && BitWidth == IntSize))
248 return Context.IntTy;
250 if (BitWidth == IntSize && Field->getType()->isUnsignedIntegerType())
251 return Context.UnsignedIntTy;
256 /// UsualUnaryConversions - Performs various conversions that are common to most
257 /// operators (C99 6.3). The conversions of array and function types are
258 /// sometimes surpressed. For example, the array->pointer conversion doesn't
259 /// apply if the array is an argument to the sizeof or address (&) operators.
260 /// In these instances, this routine should *not* be called.
261 Expr *Sema::UsualUnaryConversions(Expr *&Expr) {
262 QualType Ty = Expr->getType();
263 assert(!Ty.isNull() && "UsualUnaryConversions - missing type");
267 // The following may be used in an expression wherever an int or
268 // unsigned int may be used:
269 // - an object or expression with an integer type whose integer
270 // conversion rank is less than or equal to the rank of int
272 // - A bit-field of type _Bool, int, signed int, or unsigned int.
274 // If an int can represent all values of the original type, the
275 // value is converted to an int; otherwise, it is converted to an
276 // unsigned int. These are called the integer promotions. All
277 // other types are unchanged by the integer promotions.
278 if (Ty->isPromotableIntegerType()) {
279 ImpCastExprToType(Expr, Context.IntTy);
282 QualType T = isPromotableBitField(Expr, Context);
284 ImpCastExprToType(Expr, T);
289 DefaultFunctionArrayConversion(Expr);
293 /// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that
294 /// do not have a prototype. Arguments that have type float are promoted to
295 /// double. All other argument types are converted by UsualUnaryConversions().
296 void Sema::DefaultArgumentPromotion(Expr *&Expr) {
297 QualType Ty = Expr->getType();
298 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type");
300 // If this is a 'float' (CVR qualified or typedef) promote to double.
301 if (const BuiltinType *BT = Ty->getAsBuiltinType())
302 if (BT->getKind() == BuiltinType::Float)
303 return ImpCastExprToType(Expr, Context.DoubleTy);
305 UsualUnaryConversions(Expr);
308 /// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but
309 /// will warn if the resulting type is not a POD type, and rejects ObjC
310 /// interfaces passed by value. This returns true if the argument type is
311 /// completely illegal.
312 bool Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) {
313 DefaultArgumentPromotion(Expr);
315 if (Expr->getType()->isObjCInterfaceType()) {
316 Diag(Expr->getLocStart(),
317 diag::err_cannot_pass_objc_interface_to_vararg)
318 << Expr->getType() << CT;
322 if (!Expr->getType()->isPODType())
323 Diag(Expr->getLocStart(), diag::warn_cannot_pass_non_pod_arg_to_vararg)
324 << Expr->getType() << CT;
330 /// UsualArithmeticConversions - Performs various conversions that are common to
331 /// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this
332 /// routine returns the first non-arithmetic type found. The client is
333 /// responsible for emitting appropriate error diagnostics.
334 /// FIXME: verify the conversion rules for "complex int" are consistent with
336 QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr,
339 UsualUnaryConversions(lhsExpr);
341 UsualUnaryConversions(rhsExpr);
343 // For conversion purposes, we ignore any qualifiers.
344 // For example, "const float" and "float" are equivalent.
346 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType();
348 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType();
350 // If both types are identical, no conversion is needed.
354 // If either side is a non-arithmetic type (e.g. a pointer), we are done.
355 // The caller can deal with this (e.g. pointer + int).
356 if (!lhs->isArithmeticType() || !rhs->isArithmeticType())
359 // Perform bitfield promotions.
360 QualType LHSBitfieldPromoteTy = isPromotableBitField(lhsExpr, Context);
361 if (!LHSBitfieldPromoteTy.isNull())
362 lhs = LHSBitfieldPromoteTy;
363 QualType RHSBitfieldPromoteTy = isPromotableBitField(rhsExpr, Context);
364 if (!RHSBitfieldPromoteTy.isNull())
365 rhs = RHSBitfieldPromoteTy;
367 QualType destType = UsualArithmeticConversionsType(lhs, rhs);
369 ImpCastExprToType(lhsExpr, destType);
370 ImpCastExprToType(rhsExpr, destType);
374 QualType Sema::UsualArithmeticConversionsType(QualType lhs, QualType rhs) {
375 // Perform the usual unary conversions. We do this early so that
376 // integral promotions to "int" can allow us to exit early, in the
377 // lhs == rhs check. Also, for conversion purposes, we ignore any
378 // qualifiers. For example, "const float" and "float" are
380 if (lhs->isPromotableIntegerType())
383 lhs = lhs.getUnqualifiedType();
384 if (rhs->isPromotableIntegerType())
387 rhs = rhs.getUnqualifiedType();
389 // If both types are identical, no conversion is needed.
393 // If either side is a non-arithmetic type (e.g. a pointer), we are done.
394 // The caller can deal with this (e.g. pointer + int).
395 if (!lhs->isArithmeticType() || !rhs->isArithmeticType())
398 // At this point, we have two different arithmetic types.
400 // Handle complex types first (C99 6.3.1.8p1).
401 if (lhs->isComplexType() || rhs->isComplexType()) {
402 // if we have an integer operand, the result is the complex type.
403 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) {
404 // convert the rhs to the lhs complex type.
407 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) {
408 // convert the lhs to the rhs complex type.
411 // This handles complex/complex, complex/float, or float/complex.
412 // When both operands are complex, the shorter operand is converted to the
413 // type of the longer, and that is the type of the result. This corresponds
414 // to what is done when combining two real floating-point operands.
415 // The fun begins when size promotion occur across type domains.
416 // From H&S 6.3.4: When one operand is complex and the other is a real
417 // floating-point type, the less precise type is converted, within it's
418 // real or complex domain, to the precision of the other type. For example,
419 // when combining a "long double" with a "double _Complex", the
420 // "double _Complex" is promoted to "long double _Complex".
421 int result = Context.getFloatingTypeOrder(lhs, rhs);
423 if (result > 0) { // The left side is bigger, convert rhs.
424 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs);
425 } else if (result < 0) { // The right side is bigger, convert lhs.
426 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs);
428 // At this point, lhs and rhs have the same rank/size. Now, make sure the
429 // domains match. This is a requirement for our implementation, C99
430 // does not require this promotion.
431 if (lhs != rhs) { // Domains don't match, we have complex/float mix.
432 if (lhs->isRealFloatingType()) { // handle "double, _Complex double".
434 } else { // handle "_Complex double, double".
438 return lhs; // The domain/size match exactly.
440 // Now handle "real" floating types (i.e. float, double, long double).
441 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) {
442 // if we have an integer operand, the result is the real floating type.
443 if (rhs->isIntegerType()) {
444 // convert rhs to the lhs floating point type.
447 if (rhs->isComplexIntegerType()) {
448 // convert rhs to the complex floating point type.
449 return Context.getComplexType(lhs);
451 if (lhs->isIntegerType()) {
452 // convert lhs to the rhs floating point type.
455 if (lhs->isComplexIntegerType()) {
456 // convert lhs to the complex floating point type.
457 return Context.getComplexType(rhs);
459 // We have two real floating types, float/complex combos were handled above.
460 // Convert the smaller operand to the bigger result.
461 int result = Context.getFloatingTypeOrder(lhs, rhs);
462 if (result > 0) // convert the rhs
464 assert(result < 0 && "illegal float comparison");
465 return rhs; // convert the lhs
467 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) {
468 // Handle GCC complex int extension.
469 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType();
470 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType();
472 if (lhsComplexInt && rhsComplexInt) {
473 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(),
474 rhsComplexInt->getElementType()) >= 0)
475 return lhs; // convert the rhs
477 } else if (lhsComplexInt && rhs->isIntegerType()) {
478 // convert the rhs to the lhs complex type.
480 } else if (rhsComplexInt && lhs->isIntegerType()) {
481 // convert the lhs to the rhs complex type.
485 // Finally, we have two differing integer types.
486 // The rules for this case are in C99 6.3.1.8
487 int compare = Context.getIntegerTypeOrder(lhs, rhs);
488 bool lhsSigned = lhs->isSignedIntegerType(),
489 rhsSigned = rhs->isSignedIntegerType();
491 if (lhsSigned == rhsSigned) {
492 // Same signedness; use the higher-ranked type
493 destType = compare >= 0 ? lhs : rhs;
494 } else if (compare != (lhsSigned ? 1 : -1)) {
495 // The unsigned type has greater than or equal rank to the
496 // signed type, so use the unsigned type
497 destType = lhsSigned ? rhs : lhs;
498 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) {
499 // The two types are different widths; if we are here, that
500 // means the signed type is larger than the unsigned type, so
501 // use the signed type.
502 destType = lhsSigned ? lhs : rhs;
504 // The signed type is higher-ranked than the unsigned type,
505 // but isn't actually any bigger (like unsigned int and long
506 // on most 32-bit systems). Use the unsigned type corresponding
507 // to the signed type.
508 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs);
513 //===----------------------------------------------------------------------===//
514 // Semantic Analysis for various Expression Types
515 //===----------------------------------------------------------------------===//
518 /// ActOnStringLiteral - The specified tokens were lexed as pasted string
519 /// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string
520 /// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from
521 /// multiple tokens. However, the common case is that StringToks points to one
524 Action::OwningExprResult
525 Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) {
526 assert(NumStringToks && "Must have at least one string!");
528 StringLiteralParser Literal(StringToks, NumStringToks, PP);
529 if (Literal.hadError)
532 llvm::SmallVector<SourceLocation, 4> StringTokLocs;
533 for (unsigned i = 0; i != NumStringToks; ++i)
534 StringTokLocs.push_back(StringToks[i].getLocation());
536 QualType StrTy = Context.CharTy;
537 if (Literal.AnyWide) StrTy = Context.getWCharType();
538 if (Literal.Pascal) StrTy = Context.UnsignedCharTy;
540 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
541 if (getLangOptions().CPlusPlus)
544 // Get an array type for the string, according to C99 6.4.5. This includes
545 // the nul terminator character as well as the string length for pascal
547 StrTy = Context.getConstantArrayType(StrTy,
548 llvm::APInt(32, Literal.GetNumStringChars()+1),
549 ArrayType::Normal, 0);
551 // Pass &StringTokLocs[0], StringTokLocs.size() to factory!
552 return Owned(StringLiteral::Create(Context, Literal.GetString(),
553 Literal.GetStringLength(),
554 Literal.AnyWide, StrTy,
556 StringTokLocs.size()));
559 /// ShouldSnapshotBlockValueReference - Return true if a reference inside of
560 /// CurBlock to VD should cause it to be snapshotted (as we do for auto
561 /// variables defined outside the block) or false if this is not needed (e.g.
562 /// for values inside the block or for globals).
564 /// This also keeps the 'hasBlockDeclRefExprs' in the BlockSemaInfo records
567 static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock,
569 // If the value is defined inside the block, we couldn't snapshot it even if
571 if (CurBlock->TheDecl == VD->getDeclContext())
574 // If this is an enum constant or function, it is constant, don't snapshot.
575 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD))
578 // If this is a reference to an extern, static, or global variable, no need to
580 // FIXME: What about 'const' variables in C++?
581 if (const VarDecl *Var = dyn_cast<VarDecl>(VD))
582 if (!Var->hasLocalStorage())
585 // Blocks that have these can't be constant.
586 CurBlock->hasBlockDeclRefExprs = true;
588 // If we have nested blocks, the decl may be declared in an outer block (in
589 // which case that outer block doesn't get "hasBlockDeclRefExprs") or it may
590 // be defined outside all of the current blocks (in which case the blocks do
591 // all get the bit). Walk the nesting chain.
592 for (BlockSemaInfo *NextBlock = CurBlock->PrevBlockInfo; NextBlock;
593 NextBlock = NextBlock->PrevBlockInfo) {
594 // If we found the defining block for the variable, don't mark the block as
595 // having a reference outside it.
596 if (NextBlock->TheDecl == VD->getDeclContext())
599 // Otherwise, the DeclRef from the inner block causes the outer one to need
600 // a snapshot as well.
601 NextBlock->hasBlockDeclRefExprs = true;
609 /// ActOnIdentifierExpr - The parser read an identifier in expression context,
610 /// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this
611 /// identifier is used in a function call context.
612 /// SS is only used for a C++ qualified-id (foo::bar) to indicate the
613 /// class or namespace that the identifier must be a member of.
614 Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc,
616 bool HasTrailingLParen,
617 const CXXScopeSpec *SS,
618 bool isAddressOfOperand) {
619 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS,
623 /// BuildDeclRefExpr - Build either a DeclRefExpr or a
624 /// QualifiedDeclRefExpr based on whether or not SS is a
625 /// nested-name-specifier.
627 Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc,
628 bool TypeDependent, bool ValueDependent,
629 const CXXScopeSpec *SS) {
630 MarkDeclarationReferenced(Loc, D);
631 if (SS && !SS->isEmpty()) {
632 return new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent,
633 ValueDependent, SS->getRange(),
634 static_cast<NestedNameSpecifier *>(SS->getScopeRep()));
636 return new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent);
639 /// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or
640 /// variable corresponding to the anonymous union or struct whose type
642 static Decl *getObjectForAnonymousRecordDecl(ASTContext &Context,
643 RecordDecl *Record) {
644 assert(Record->isAnonymousStructOrUnion() &&
645 "Record must be an anonymous struct or union!");
647 // FIXME: Once Decls are directly linked together, this will be an O(1)
648 // operation rather than a slow walk through DeclContext's vector (which
649 // itself will be eliminated). DeclGroups might make this even better.
650 DeclContext *Ctx = Record->getDeclContext();
651 for (DeclContext::decl_iterator D = Ctx->decls_begin(Context),
652 DEnd = Ctx->decls_end(Context);
655 // The object for the anonymous struct/union directly
656 // follows its type in the list of declarations.
658 assert(D != DEnd && "Missing object for anonymous record");
659 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed");
664 assert(false && "Missing object for anonymous record");
668 /// \brief Given a field that represents a member of an anonymous
669 /// struct/union, build the path from that field's context to the
672 /// Construct the sequence of field member references we'll have to
673 /// perform to get to the field in the anonymous union/struct. The
674 /// list of members is built from the field outward, so traverse it
675 /// backwards to go from an object in the current context to the field
678 /// \returns The variable from which the field access should begin,
679 /// for an anonymous struct/union that is not a member of another
680 /// class. Otherwise, returns NULL.
681 VarDecl *Sema::BuildAnonymousStructUnionMemberPath(FieldDecl *Field,
682 llvm::SmallVectorImpl<FieldDecl *> &Path) {
683 assert(Field->getDeclContext()->isRecord() &&
684 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion()
685 && "Field must be stored inside an anonymous struct or union");
687 Path.push_back(Field);
688 VarDecl *BaseObject = 0;
689 DeclContext *Ctx = Field->getDeclContext();
691 RecordDecl *Record = cast<RecordDecl>(Ctx);
692 Decl *AnonObject = getObjectForAnonymousRecordDecl(Context, Record);
693 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject))
694 Path.push_back(AnonField);
696 BaseObject = cast<VarDecl>(AnonObject);
699 Ctx = Ctx->getParent();
700 } while (Ctx->isRecord() &&
701 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion());
706 Sema::OwningExprResult
707 Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc,
709 Expr *BaseObjectExpr,
710 SourceLocation OpLoc) {
711 llvm::SmallVector<FieldDecl *, 4> AnonFields;
712 VarDecl *BaseObject = BuildAnonymousStructUnionMemberPath(Field,
715 // Build the expression that refers to the base object, from
716 // which we will build a sequence of member references to each
717 // of the anonymous union objects and, eventually, the field we
718 // found via name lookup.
719 bool BaseObjectIsPointer = false;
720 unsigned ExtraQuals = 0;
722 // BaseObject is an anonymous struct/union variable (and is,
723 // therefore, not part of another non-anonymous record).
724 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context);
725 MarkDeclarationReferenced(Loc, BaseObject);
726 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(),
729 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers();
730 } else if (BaseObjectExpr) {
731 // The caller provided the base object expression. Determine
732 // whether its a pointer and whether it adds any qualifiers to the
733 // anonymous struct/union fields we're looking into.
734 QualType ObjectType = BaseObjectExpr->getType();
735 if (const PointerType *ObjectPtr = ObjectType->getAsPointerType()) {
736 BaseObjectIsPointer = true;
737 ObjectType = ObjectPtr->getPointeeType();
739 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers();
741 // We've found a member of an anonymous struct/union that is
742 // inside a non-anonymous struct/union, so in a well-formed
743 // program our base object expression is "this".
744 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) {
745 if (!MD->isStatic()) {
746 QualType AnonFieldType
747 = Context.getTagDeclType(
748 cast<RecordDecl>(AnonFields.back()->getDeclContext()));
749 QualType ThisType = Context.getTagDeclType(MD->getParent());
750 if ((Context.getCanonicalType(AnonFieldType)
751 == Context.getCanonicalType(ThisType)) ||
752 IsDerivedFrom(ThisType, AnonFieldType)) {
753 // Our base object expression is "this".
754 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(),
755 MD->getThisType(Context));
756 BaseObjectIsPointer = true;
759 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method)
760 << Field->getDeclName());
762 ExtraQuals = MD->getTypeQualifiers();
766 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use)
767 << Field->getDeclName());
770 // Build the implicit member references to the field of the
771 // anonymous struct/union.
772 Expr *Result = BaseObjectExpr;
773 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator
774 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend();
776 QualType MemberType = (*FI)->getType();
777 if (!(*FI)->isMutable()) {
778 unsigned combinedQualifiers
779 = MemberType.getCVRQualifiers() | ExtraQuals;
780 MemberType = MemberType.getQualifiedType(combinedQualifiers);
782 MarkDeclarationReferenced(Loc, *FI);
783 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI,
785 BaseObjectIsPointer = false;
786 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers();
789 return Owned(Result);
792 /// ActOnDeclarationNameExpr - The parser has read some kind of name
793 /// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine
794 /// performs lookup on that name and returns an expression that refers
795 /// to that name. This routine isn't directly called from the parser,
796 /// because the parser doesn't know about DeclarationName. Rather,
797 /// this routine is called by ActOnIdentifierExpr,
798 /// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr,
799 /// which form the DeclarationName from the corresponding syntactic
802 /// HasTrailingLParen indicates whether this identifier is used in a
803 /// function call context. LookupCtx is only used for a C++
804 /// qualified-id (foo::bar) to indicate the class or namespace that
805 /// the identifier must be a member of.
807 /// isAddressOfOperand means that this expression is the direct operand
808 /// of an address-of operator. This matters because this is the only
809 /// situation where a qualified name referencing a non-static member may
810 /// appear outside a member function of this class.
811 Sema::OwningExprResult
812 Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc,
813 DeclarationName Name, bool HasTrailingLParen,
814 const CXXScopeSpec *SS,
815 bool isAddressOfOperand) {
816 // Could be enum-constant, value decl, instance variable, etc.
817 if (SS && SS->isInvalid())
820 // C++ [temp.dep.expr]p3:
821 // An id-expression is type-dependent if it contains:
822 // -- a nested-name-specifier that contains a class-name that
823 // names a dependent type.
824 // FIXME: Member of the current instantiation.
825 if (SS && isDependentScopeSpecifier(*SS)) {
826 return Owned(new (Context) UnresolvedDeclRefExpr(Name, Context.DependentTy,
828 static_cast<NestedNameSpecifier *>(SS->getScopeRep())));
831 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName,
834 if (Lookup.isAmbiguous()) {
835 DiagnoseAmbiguousLookup(Lookup, Name, Loc,
836 SS && SS->isSet() ? SS->getRange()
841 NamedDecl *D = Lookup.getAsDecl();
843 // If this reference is in an Objective-C method, then ivar lookup happens as
845 IdentifierInfo *II = Name.getAsIdentifierInfo();
846 if (II && getCurMethodDecl()) {
847 // There are two cases to handle here. 1) scoped lookup could have failed,
848 // in which case we should look for an ivar. 2) scoped lookup could have
849 // found a decl, but that decl is outside the current instance method (i.e.
850 // a global variable). In these two cases, we do a lookup for an ivar with
851 // this name, if the lookup sucedes, we replace it our current decl.
852 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) {
853 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface();
854 ObjCInterfaceDecl *ClassDeclared;
855 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(Context, II,
857 // Check if referencing a field with __attribute__((deprecated)).
858 if (DiagnoseUseOfDecl(IV, Loc))
861 // If we're referencing an invalid decl, just return this as a silent
862 // error node. The error diagnostic was already emitted on the decl.
863 if (IV->isInvalidDecl())
866 bool IsClsMethod = getCurMethodDecl()->isClassMethod();
867 // If a class method attemps to use a free standing ivar, this is
869 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod())
870 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method)
871 << IV->getDeclName());
872 // If a class method uses a global variable, even if an ivar with
873 // same name exists, use the global.
875 if (IV->getAccessControl() == ObjCIvarDecl::Private &&
876 ClassDeclared != IFace)
877 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName();
878 // FIXME: This should use a new expr for a direct reference, don't
879 // turn this into Self->ivar, just return a BareIVarExpr or something.
880 IdentifierInfo &II = Context.Idents.get("self");
881 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false);
882 MarkDeclarationReferenced(Loc, IV);
883 return Owned(new (Context)
884 ObjCIvarRefExpr(IV, IV->getType(), Loc,
885 SelfExpr.takeAs<Expr>(), true, true));
889 else if (getCurMethodDecl()->isInstanceMethod()) {
890 // We should warn if a local variable hides an ivar.
891 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface();
892 ObjCInterfaceDecl *ClassDeclared;
893 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(Context, II,
895 if (IV->getAccessControl() != ObjCIvarDecl::Private ||
896 IFace == ClassDeclared)
897 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName();
900 // Needed to implement property "super.method" notation.
901 if (D == 0 && II->isStr("super")) {
904 if (getCurMethodDecl()->isInstanceMethod())
905 T = Context.getPointerType(Context.getObjCInterfaceType(
906 getCurMethodDecl()->getClassInterface()));
908 T = Context.getObjCClassType();
909 return Owned(new (Context) ObjCSuperExpr(Loc, T));
913 // Determine whether this name might be a candidate for
914 // argument-dependent lookup.
915 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) &&
919 // We've seen something of the form
923 // and we did not find any entity by the name
924 // "identifier". However, this identifier is still subject to
925 // argument-dependent lookup, so keep track of the name.
926 return Owned(new (Context) UnresolvedFunctionNameExpr(Name,
932 // Otherwise, this could be an implicitly declared function reference (legal
933 // in C90, extension in C99).
934 if (HasTrailingLParen && II &&
935 !getLangOptions().CPlusPlus) // Not in C++.
936 D = ImplicitlyDefineFunction(Loc, *II, S);
938 // If this name wasn't predeclared and if this is not a function call,
939 // diagnose the problem.
940 if (SS && !SS->isEmpty())
941 return ExprError(Diag(Loc, diag::err_typecheck_no_member)
942 << Name << SS->getRange());
943 else if (Name.getNameKind() == DeclarationName::CXXOperatorName ||
944 Name.getNameKind() == DeclarationName::CXXConversionFunctionName)
945 return ExprError(Diag(Loc, diag::err_undeclared_use)
946 << Name.getAsString());
948 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name);
952 // If this is an expression of the form &Class::member, don't build an
953 // implicit member ref, because we want a pointer to the member in general,
954 // not any specific instance's member.
955 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) {
956 DeclContext *DC = computeDeclContext(*SS);
957 if (D && isa<CXXRecordDecl>(DC)) {
959 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
960 DType = FD->getType().getNonReferenceType();
961 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
962 DType = Method->getType();
963 } else if (isa<OverloadedFunctionDecl>(D)) {
964 DType = Context.OverloadTy;
966 // Could be an inner type. That's diagnosed below, so ignore it here.
967 if (!DType.isNull()) {
968 // The pointer is type- and value-dependent if it points into something
970 bool Dependent = DC->isDependentContext();
971 return Owned(BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS));
976 // We may have found a field within an anonymous union or struct
977 // (C++ [class.union]).
978 if (FieldDecl *FD = dyn_cast<FieldDecl>(D))
979 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion())
980 return BuildAnonymousStructUnionMemberReference(Loc, FD);
982 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) {
983 if (!MD->isStatic()) {
984 // C++ [class.mfct.nonstatic]p2:
985 // [...] if name lookup (3.4.1) resolves the name in the
986 // id-expression to a nonstatic nontype member of class X or of
987 // a base class of X, the id-expression is transformed into a
988 // class member access expression (5.2.5) using (*this) (9.3.2)
989 // as the postfix-expression to the left of the '.' operator.
990 DeclContext *Ctx = 0;
992 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
993 Ctx = FD->getDeclContext();
994 MemberType = FD->getType();
996 if (const ReferenceType *RefType = MemberType->getAsReferenceType())
997 MemberType = RefType->getPointeeType();
998 else if (!FD->isMutable()) {
999 unsigned combinedQualifiers
1000 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers();
1001 MemberType = MemberType.getQualifiedType(combinedQualifiers);
1003 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
1004 if (!Method->isStatic()) {
1005 Ctx = Method->getParent();
1006 MemberType = Method->getType();
1008 } else if (OverloadedFunctionDecl *Ovl
1009 = dyn_cast<OverloadedFunctionDecl>(D)) {
1010 for (OverloadedFunctionDecl::function_iterator
1011 Func = Ovl->function_begin(),
1012 FuncEnd = Ovl->function_end();
1013 Func != FuncEnd; ++Func) {
1014 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func))
1015 if (!DMethod->isStatic()) {
1016 Ctx = Ovl->getDeclContext();
1017 MemberType = Context.OverloadTy;
1023 if (Ctx && Ctx->isRecord()) {
1024 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx));
1025 QualType ThisType = Context.getTagDeclType(MD->getParent());
1026 if ((Context.getCanonicalType(CtxType)
1027 == Context.getCanonicalType(ThisType)) ||
1028 IsDerivedFrom(ThisType, CtxType)) {
1029 // Build the implicit member access expression.
1030 Expr *This = new (Context) CXXThisExpr(SourceLocation(),
1031 MD->getThisType(Context));
1032 MarkDeclarationReferenced(Loc, D);
1033 return Owned(new (Context) MemberExpr(This, true, D,
1040 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
1041 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) {
1043 // "invalid use of member 'x' in static member function"
1044 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method)
1045 << FD->getDeclName());
1048 // Any other ways we could have found the field in a well-formed
1049 // program would have been turned into implicit member expressions
1051 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use)
1052 << FD->getDeclName());
1055 if (isa<TypedefDecl>(D))
1056 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name);
1057 if (isa<ObjCInterfaceDecl>(D))
1058 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name);
1059 if (isa<NamespaceDecl>(D))
1060 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name);
1062 // Make the DeclRefExpr or BlockDeclRefExpr for the decl.
1063 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D))
1064 return Owned(BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc,
1066 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D))
1067 return Owned(BuildDeclRefExpr(Template, Context.OverloadTy, Loc,
1069 ValueDecl *VD = cast<ValueDecl>(D);
1071 // Check whether this declaration can be used. Note that we suppress
1072 // this check when we're going to perform argument-dependent lookup
1073 // on this function name, because this might not be the function
1074 // that overload resolution actually selects.
1075 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc))
1078 if (VarDecl *Var = dyn_cast<VarDecl>(VD)) {
1079 // Warn about constructs like:
1080 // if (void *X = foo()) { ... } else { X }.
1081 // In the else block, the pointer is always false.
1083 // FIXME: In a template instantiation, we don't have scope
1084 // information to check this property.
1085 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) {
1088 if (CheckS->isWithinElse() &&
1089 CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) {
1090 if (Var->getType()->isBooleanType())
1091 ExprError(Diag(Loc, diag::warn_value_always_false)
1092 << Var->getDeclName());
1094 ExprError(Diag(Loc, diag::warn_value_always_zero)
1095 << Var->getDeclName());
1099 // Move up one more control parent to check again.
1100 CheckS = CheckS->getControlParent();
1102 CheckS = CheckS->getParent();
1105 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(VD)) {
1106 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) {
1107 // C99 DR 316 says that, if a function type comes from a
1108 // function definition (without a prototype), that type is only
1109 // used for checking compatibility. Therefore, when referencing
1110 // the function, we pretend that we don't have the full function
1112 QualType T = Func->getType();
1113 QualType NoProtoType = T;
1114 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType())
1115 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType());
1116 return Owned(BuildDeclRefExpr(VD, NoProtoType, Loc, false, false, SS));
1120 // Only create DeclRefExpr's for valid Decl's.
1121 if (VD->isInvalidDecl())
1124 // If the identifier reference is inside a block, and it refers to a value
1125 // that is outside the block, create a BlockDeclRefExpr instead of a
1126 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when
1127 // the block is formed.
1129 // We do not do this for things like enum constants, global variables, etc,
1130 // as they do not get snapshotted.
1132 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) {
1133 MarkDeclarationReferenced(Loc, VD);
1134 QualType ExprTy = VD->getType().getNonReferenceType();
1135 // The BlocksAttr indicates the variable is bound by-reference.
1136 if (VD->getAttr<BlocksAttr>(Context))
1137 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true));
1138 // This is to record that a 'const' was actually synthesize and added.
1139 bool constAdded = !ExprTy.isConstQualified();
1140 // Variable will be bound by-copy, make it const within the closure.
1143 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false,
1146 // If this reference is not in a block or if the referenced variable is
1147 // within the block, create a normal DeclRefExpr.
1149 bool TypeDependent = false;
1150 bool ValueDependent = false;
1151 if (getLangOptions().CPlusPlus) {
1152 // C++ [temp.dep.expr]p3:
1153 // An id-expression is type-dependent if it contains:
1154 // - an identifier that was declared with a dependent type,
1155 if (VD->getType()->isDependentType())
1156 TypeDependent = true;
1157 // - FIXME: a template-id that is dependent,
1158 // - a conversion-function-id that specifies a dependent type,
1159 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName &&
1160 Name.getCXXNameType()->isDependentType())
1161 TypeDependent = true;
1162 // - a nested-name-specifier that contains a class-name that
1163 // names a dependent type.
1164 else if (SS && !SS->isEmpty()) {
1165 for (DeclContext *DC = computeDeclContext(*SS);
1166 DC; DC = DC->getParent()) {
1167 // FIXME: could stop early at namespace scope.
1168 if (DC->isRecord()) {
1169 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC);
1170 if (Context.getTypeDeclType(Record)->isDependentType()) {
1171 TypeDependent = true;
1178 // C++ [temp.dep.constexpr]p2:
1180 // An identifier is value-dependent if it is:
1181 // - a name declared with a dependent type,
1183 ValueDependent = true;
1184 // - the name of a non-type template parameter,
1185 else if (isa<NonTypeTemplateParmDecl>(VD))
1186 ValueDependent = true;
1187 // - a constant with integral or enumeration type and is
1188 // initialized with an expression that is value-dependent
1189 else if (const VarDecl *Dcl = dyn_cast<VarDecl>(VD)) {
1190 if (Dcl->getType().getCVRQualifiers() == QualType::Const &&
1192 ValueDependent = Dcl->getInit()->isValueDependent();
1197 return Owned(BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc,
1198 TypeDependent, ValueDependent, SS));
1201 Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc,
1202 tok::TokenKind Kind) {
1203 PredefinedExpr::IdentType IT;
1206 default: assert(0 && "Unknown simple primary expr!");
1207 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2]
1208 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break;
1209 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break;
1212 // Pre-defined identifiers are of type char[x], where x is the length of the
1215 if (FunctionDecl *FD = getCurFunctionDecl())
1216 Length = FD->getIdentifier()->getLength();
1217 else if (ObjCMethodDecl *MD = getCurMethodDecl())
1218 Length = MD->getSynthesizedMethodSize();
1220 Diag(Loc, diag::ext_predef_outside_function);
1221 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string.
1222 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0;
1226 llvm::APInt LengthI(32, Length + 1);
1227 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const);
1228 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0);
1229 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT));
1232 Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) {
1233 llvm::SmallString<16> CharBuffer;
1234 CharBuffer.resize(Tok.getLength());
1235 const char *ThisTokBegin = &CharBuffer[0];
1236 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin);
1238 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength,
1239 Tok.getLocation(), PP);
1240 if (Literal.hadError())
1243 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy;
1245 return Owned(new (Context) CharacterLiteral(Literal.getValue(),
1247 type, Tok.getLocation()));
1250 Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) {
1251 // Fast path for a single digit (which is quite common). A single digit
1252 // cannot have a trigraph, escaped newline, radix prefix, or type suffix.
1253 if (Tok.getLength() == 1) {
1254 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok);
1255 unsigned IntSize = Context.Target.getIntWidth();
1256 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'),
1257 Context.IntTy, Tok.getLocation()));
1260 llvm::SmallString<512> IntegerBuffer;
1261 // Add padding so that NumericLiteralParser can overread by one character.
1262 IntegerBuffer.resize(Tok.getLength()+1);
1263 const char *ThisTokBegin = &IntegerBuffer[0];
1265 // Get the spelling of the token, which eliminates trigraphs, etc.
1266 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin);
1268 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength,
1269 Tok.getLocation(), PP);
1270 if (Literal.hadError)
1275 if (Literal.isFloatingLiteral()) {
1277 if (Literal.isFloat)
1278 Ty = Context.FloatTy;
1279 else if (!Literal.isLong)
1280 Ty = Context.DoubleTy;
1282 Ty = Context.LongDoubleTy;
1284 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty);
1286 // isExact will be set by GetFloatValue().
1287 bool isExact = false;
1288 Res = new (Context) FloatingLiteral(Literal.GetFloatValue(Format, &isExact),
1289 &isExact, Ty, Tok.getLocation());
1291 } else if (!Literal.isIntegerLiteral()) {
1296 // long long is a C99 feature.
1297 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x &&
1299 Diag(Tok.getLocation(), diag::ext_longlong);
1301 // Get the value in the widest-possible width.
1302 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0);
1304 if (Literal.GetIntegerValue(ResultVal)) {
1305 // If this value didn't fit into uintmax_t, warn and force to ull.
1306 Diag(Tok.getLocation(), diag::warn_integer_too_large);
1307 Ty = Context.UnsignedLongLongTy;
1308 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() &&
1309 "long long is not intmax_t?");
1311 // If this value fits into a ULL, try to figure out what else it fits into
1312 // according to the rules of C99 6.4.4.1p5.
1314 // Octal, Hexadecimal, and integers with a U suffix are allowed to
1315 // be an unsigned int.
1316 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10;
1318 // Check from smallest to largest, picking the smallest type we can.
1320 if (!Literal.isLong && !Literal.isLongLong) {
1321 // Are int/unsigned possibilities?
1322 unsigned IntSize = Context.Target.getIntWidth();
1324 // Does it fit in a unsigned int?
1325 if (ResultVal.isIntN(IntSize)) {
1326 // Does it fit in a signed int?
1327 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0)
1329 else if (AllowUnsigned)
1330 Ty = Context.UnsignedIntTy;
1335 // Are long/unsigned long possibilities?
1336 if (Ty.isNull() && !Literal.isLongLong) {
1337 unsigned LongSize = Context.Target.getLongWidth();
1339 // Does it fit in a unsigned long?
1340 if (ResultVal.isIntN(LongSize)) {
1341 // Does it fit in a signed long?
1342 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0)
1343 Ty = Context.LongTy;
1344 else if (AllowUnsigned)
1345 Ty = Context.UnsignedLongTy;
1350 // Finally, check long long if needed.
1352 unsigned LongLongSize = Context.Target.getLongLongWidth();
1354 // Does it fit in a unsigned long long?
1355 if (ResultVal.isIntN(LongLongSize)) {
1356 // Does it fit in a signed long long?
1357 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0)
1358 Ty = Context.LongLongTy;
1359 else if (AllowUnsigned)
1360 Ty = Context.UnsignedLongLongTy;
1361 Width = LongLongSize;
1365 // If we still couldn't decide a type, we probably have something that
1366 // does not fit in a signed long long, but has no U suffix.
1368 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed);
1369 Ty = Context.UnsignedLongLongTy;
1370 Width = Context.Target.getLongLongWidth();
1373 if (ResultVal.getBitWidth() != Width)
1374 ResultVal.trunc(Width);
1376 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation());
1379 // If this is an imaginary literal, create the ImaginaryLiteral wrapper.
1380 if (Literal.isImaginary)
1381 Res = new (Context) ImaginaryLiteral(Res,
1382 Context.getComplexType(Res->getType()));
1387 Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L,
1388 SourceLocation R, ExprArg Val) {
1389 Expr *E = Val.takeAs<Expr>();
1390 assert((E != 0) && "ActOnParenExpr() missing expr");
1391 return Owned(new (Context) ParenExpr(L, R, E));
1394 /// The UsualUnaryConversions() function is *not* called by this routine.
1395 /// See C99 6.3.2.1p[2-4] for more details.
1396 bool Sema::CheckSizeOfAlignOfOperand(QualType exprType,
1397 SourceLocation OpLoc,
1398 const SourceRange &ExprRange,
1400 if (exprType->isDependentType())
1404 if (isa<FunctionType>(exprType)) {
1405 // alignof(function) is allowed as an extension.
1407 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange;
1411 // Allow sizeof(void)/alignof(void) as an extension.
1412 if (exprType->isVoidType()) {
1413 Diag(OpLoc, diag::ext_sizeof_void_type)
1414 << (isSizeof ? "sizeof" : "__alignof") << ExprRange;
1418 if (RequireCompleteType(OpLoc, exprType,
1419 isSizeof ? diag::err_sizeof_incomplete_type :
1420 diag::err_alignof_incomplete_type,
1424 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode.
1425 if (LangOpts.ObjCNonFragileABI && exprType->isObjCInterfaceType()) {
1426 Diag(OpLoc, diag::err_sizeof_nonfragile_interface)
1427 << exprType << isSizeof << ExprRange;
1434 bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc,
1435 const SourceRange &ExprRange) {
1436 E = E->IgnoreParens();
1438 // alignof decl is always ok.
1439 if (isa<DeclRefExpr>(E))
1442 // Cannot know anything else if the expression is dependent.
1443 if (E->isTypeDependent())
1446 if (E->getBitField()) {
1447 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange;
1451 // Alignment of a field access is always okay, so long as it isn't a
1453 if (MemberExpr *ME = dyn_cast<MemberExpr>(E))
1454 if (dyn_cast<FieldDecl>(ME->getMemberDecl()))
1457 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false);
1460 /// \brief Build a sizeof or alignof expression given a type operand.
1461 Action::OwningExprResult
1462 Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc,
1463 bool isSizeOf, SourceRange R) {
1467 if (!T->isDependentType() &&
1468 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf))
1471 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
1472 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T,
1473 Context.getSizeType(), OpLoc,
1477 /// \brief Build a sizeof or alignof expression given an expression
1479 Action::OwningExprResult
1480 Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc,
1481 bool isSizeOf, SourceRange R) {
1482 // Verify that the operand is valid.
1483 bool isInvalid = false;
1484 if (E->isTypeDependent()) {
1485 // Delay type-checking for type-dependent expressions.
1486 } else if (!isSizeOf) {
1487 isInvalid = CheckAlignOfExpr(E, OpLoc, R);
1488 } else if (E->getBitField()) { // C99 6.5.3.4p1.
1489 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0;
1492 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true);
1498 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
1499 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E,
1500 Context.getSizeType(), OpLoc,
1504 /// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and
1505 /// the same for @c alignof and @c __alignof
1506 /// Note that the ArgRange is invalid if isType is false.
1507 Action::OwningExprResult
1508 Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType,
1509 void *TyOrEx, const SourceRange &ArgRange) {
1510 // If error parsing type, ignore.
1511 if (TyOrEx == 0) return ExprError();
1514 QualType ArgTy = QualType::getFromOpaquePtr(TyOrEx);
1515 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange);
1518 // Get the end location.
1519 Expr *ArgEx = (Expr *)TyOrEx;
1520 Action::OwningExprResult Result
1521 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange());
1523 if (Result.isInvalid())
1526 return move(Result);
1529 QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) {
1530 if (V->isTypeDependent())
1531 return Context.DependentTy;
1533 // These operators return the element type of a complex type.
1534 if (const ComplexType *CT = V->getType()->getAsComplexType())
1535 return CT->getElementType();
1537 // Otherwise they pass through real integer and floating point types here.
1538 if (V->getType()->isArithmeticType())
1539 return V->getType();
1541 // Reject anything else.
1542 Diag(Loc, diag::err_realimag_invalid_type) << V->getType()
1543 << (isReal ? "__real" : "__imag");
1549 Action::OwningExprResult
1550 Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc,
1551 tok::TokenKind Kind, ExprArg Input) {
1552 Expr *Arg = (Expr *)Input.get();
1554 UnaryOperator::Opcode Opc;
1556 default: assert(0 && "Unknown unary op!");
1557 case tok::plusplus: Opc = UnaryOperator::PostInc; break;
1558 case tok::minusminus: Opc = UnaryOperator::PostDec; break;
1561 if (getLangOptions().CPlusPlus &&
1562 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) {
1563 // Which overloaded operator?
1564 OverloadedOperatorKind OverOp =
1565 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus;
1567 // C++ [over.inc]p1:
1569 // [...] If the function is a member function with one
1570 // parameter (which shall be of type int) or a non-member
1571 // function with two parameters (the second of which shall be
1572 // of type int), it defines the postfix increment operator ++
1573 // for objects of that type. When the postfix increment is
1574 // called as a result of using the ++ operator, the int
1575 // argument will have value zero.
1578 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0,
1579 /*isSigned=*/true), Context.IntTy, SourceLocation())
1582 // Build the candidate set for overloading
1583 OverloadCandidateSet CandidateSet;
1584 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet);
1586 // Perform overload resolution.
1587 OverloadCandidateSet::iterator Best;
1588 switch (BestViableFunction(CandidateSet, OpLoc, Best)) {
1590 // We found a built-in operator or an overloaded operator.
1591 FunctionDecl *FnDecl = Best->Function;
1594 // We matched an overloaded operator. Build a call to that
1597 // Convert the arguments.
1598 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) {
1599 if (PerformObjectArgumentInitialization(Arg, Method))
1602 // Convert the arguments.
1603 if (PerformCopyInitialization(Arg,
1604 FnDecl->getParamDecl(0)->getType(),
1609 // Determine the result type
1611 = FnDecl->getType()->getAsFunctionType()->getResultType();
1612 ResultTy = ResultTy.getNonReferenceType();
1614 // Build the actual expression node.
1615 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(),
1617 UsualUnaryConversions(FnExpr);
1621 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr,
1625 // We matched a built-in operator. Convert the arguments, then
1626 // break out so that we will build the appropriate built-in
1628 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0],
1636 case OR_No_Viable_Function:
1637 // No viable function; fall through to handling this as a
1638 // built-in operator, which will produce an error message for us.
1642 Diag(OpLoc, diag::err_ovl_ambiguous_oper)
1643 << UnaryOperator::getOpcodeStr(Opc)
1644 << Arg->getSourceRange();
1645 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true);
1649 Diag(OpLoc, diag::err_ovl_deleted_oper)
1650 << Best->Function->isDeleted()
1651 << UnaryOperator::getOpcodeStr(Opc)
1652 << Arg->getSourceRange();
1653 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true);
1657 // Either we found no viable overloaded operator or we matched a
1658 // built-in operator. In either case, fall through to trying to
1659 // build a built-in operation.
1662 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc,
1663 Opc == UnaryOperator::PostInc);
1664 if (result.isNull())
1667 return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc));
1670 Action::OwningExprResult
1671 Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc,
1672 ExprArg Idx, SourceLocation RLoc) {
1673 Expr *LHSExp = static_cast<Expr*>(Base.get()),
1674 *RHSExp = static_cast<Expr*>(Idx.get());
1676 if (getLangOptions().CPlusPlus &&
1677 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) {
1680 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp,
1681 Context.DependentTy, RLoc));
1684 if (getLangOptions().CPlusPlus &&
1685 (LHSExp->getType()->isRecordType() ||
1686 LHSExp->getType()->isEnumeralType() ||
1687 RHSExp->getType()->isRecordType() ||
1688 RHSExp->getType()->isEnumeralType())) {
1689 // Add the appropriate overloaded operators (C++ [over.match.oper])
1690 // to the candidate set.
1691 OverloadCandidateSet CandidateSet;
1692 Expr *Args[2] = { LHSExp, RHSExp };
1693 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet,
1694 SourceRange(LLoc, RLoc));
1696 // Perform overload resolution.
1697 OverloadCandidateSet::iterator Best;
1698 switch (BestViableFunction(CandidateSet, LLoc, Best)) {
1700 // We found a built-in operator or an overloaded operator.
1701 FunctionDecl *FnDecl = Best->Function;
1704 // We matched an overloaded operator. Build a call to that
1707 // Convert the arguments.
1708 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) {
1709 if (PerformObjectArgumentInitialization(LHSExp, Method) ||
1710 PerformCopyInitialization(RHSExp,
1711 FnDecl->getParamDecl(0)->getType(),
1715 // Convert the arguments.
1716 if (PerformCopyInitialization(LHSExp,
1717 FnDecl->getParamDecl(0)->getType(),
1719 PerformCopyInitialization(RHSExp,
1720 FnDecl->getParamDecl(1)->getType(),
1725 // Determine the result type
1727 = FnDecl->getType()->getAsFunctionType()->getResultType();
1728 ResultTy = ResultTy.getNonReferenceType();
1730 // Build the actual expression node.
1731 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(),
1733 UsualUnaryConversions(FnExpr);
1739 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript,
1743 // We matched a built-in operator. Convert the arguments, then
1744 // break out so that we will build the appropriate built-in
1746 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0],
1748 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1],
1756 case OR_No_Viable_Function:
1757 // No viable function; fall through to handling this as a
1758 // built-in operator, which will produce an error message for us.
1762 Diag(LLoc, diag::err_ovl_ambiguous_oper)
1764 << LHSExp->getSourceRange() << RHSExp->getSourceRange();
1765 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true);
1769 Diag(LLoc, diag::err_ovl_deleted_oper)
1770 << Best->Function->isDeleted()
1772 << LHSExp->getSourceRange() << RHSExp->getSourceRange();
1773 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true);
1777 // Either we found no viable overloaded operator or we matched a
1778 // built-in operator. In either case, fall through to trying to
1779 // build a built-in operation.
1782 // Perform default conversions.
1783 DefaultFunctionArrayConversion(LHSExp);
1784 DefaultFunctionArrayConversion(RHSExp);
1786 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType();
1788 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent
1789 // to the expression *((e1)+(e2)). This means the array "Base" may actually be
1790 // in the subscript position. As a result, we need to derive the array base
1791 // and index from the expression types.
1792 Expr *BaseExpr, *IndexExpr;
1793 QualType ResultType;
1794 if (LHSTy->isDependentType() || RHSTy->isDependentType()) {
1797 ResultType = Context.DependentTy;
1798 } else if (const PointerType *PTy = LHSTy->getAsPointerType()) {
1801 ResultType = PTy->getPointeeType();
1802 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) {
1803 // Handle the uncommon case of "123[Ptr]".
1806 ResultType = PTy->getPointeeType();
1807 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) {
1808 BaseExpr = LHSExp; // vectors: V[123]
1811 // FIXME: need to deal with const...
1812 ResultType = VTy->getElementType();
1813 } else if (LHSTy->isArrayType()) {
1814 // If we see an array that wasn't promoted by
1815 // DefaultFunctionArrayConversion, it must be an array that
1816 // wasn't promoted because of the C90 rule that doesn't
1817 // allow promoting non-lvalue arrays. Warn, then
1818 // force the promotion here.
1819 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) <<
1820 LHSExp->getSourceRange();
1821 ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy));
1822 LHSTy = LHSExp->getType();
1826 ResultType = LHSTy->getAsPointerType()->getPointeeType();
1827 } else if (RHSTy->isArrayType()) {
1828 // Same as previous, except for 123[f().a] case
1829 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) <<
1830 RHSExp->getSourceRange();
1831 ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy));
1832 RHSTy = RHSExp->getType();
1836 ResultType = RHSTy->getAsPointerType()->getPointeeType();
1838 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value)
1839 << LHSExp->getSourceRange() << RHSExp->getSourceRange());
1842 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent())
1843 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer)
1844 << IndexExpr->getSourceRange());
1846 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly,
1847 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object
1848 // type. Note that Functions are not objects, and that (in C99 parlance)
1849 // incomplete types are not object types.
1850 if (ResultType->isFunctionType()) {
1851 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type)
1852 << ResultType << BaseExpr->getSourceRange();
1856 if (!ResultType->isDependentType() &&
1857 RequireCompleteType(LLoc, ResultType, diag::err_subscript_incomplete_type,
1858 BaseExpr->getSourceRange()))
1861 // Diagnose bad cases where we step over interface counts.
1862 if (ResultType->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) {
1863 Diag(LLoc, diag::err_subscript_nonfragile_interface)
1864 << ResultType << BaseExpr->getSourceRange();
1870 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp,
1875 CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc,
1876 IdentifierInfo &CompName, SourceLocation CompLoc) {
1877 const ExtVectorType *vecType = baseType->getAsExtVectorType();
1879 // The vector accessor can't exceed the number of elements.
1880 const char *compStr = CompName.getName();
1882 // This flag determines whether or not the component is one of the four
1883 // special names that indicate a subset of exactly half the elements are
1885 bool HalvingSwizzle = false;
1887 // This flag determines whether or not CompName has an 's' char prefix,
1888 // indicating that it is a string of hex values to be used as vector indices.
1889 bool HexSwizzle = *compStr == 's';
1891 // Check that we've found one of the special components, or that the component
1892 // names must come from the same set.
1893 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") ||
1894 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) {
1895 HalvingSwizzle = true;
1896 } else if (vecType->getPointAccessorIdx(*compStr) != -1) {
1899 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1);
1900 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) {
1903 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1);
1906 if (!HalvingSwizzle && *compStr) {
1907 // We didn't get to the end of the string. This means the component names
1908 // didn't come from the same set *or* we encountered an illegal name.
1909 Diag(OpLoc, diag::err_ext_vector_component_name_illegal)
1910 << std::string(compStr,compStr+1) << SourceRange(CompLoc);
1914 // Ensure no component accessor exceeds the width of the vector type it
1916 if (!HalvingSwizzle) {
1917 compStr = CompName.getName();
1923 if (!vecType->isAccessorWithinNumElements(*compStr++)) {
1924 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length)
1925 << baseType << SourceRange(CompLoc);
1931 // If this is a halving swizzle, verify that the base type has an even
1932 // number of elements.
1933 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) {
1934 Diag(OpLoc, diag::err_ext_vector_component_requires_even)
1935 << baseType << SourceRange(CompLoc);
1939 // The component accessor looks fine - now we need to compute the actual type.
1940 // The vector type is implied by the component accessor. For example,
1941 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc.
1942 // vec4.s0 is a float, vec4.s23 is a vec3, etc.
1943 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2.
1944 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2
1945 : CompName.getLength();
1950 return vecType->getElementType();
1952 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize);
1953 // Now look up the TypeDefDecl from the vector type. Without this,
1954 // diagostics look bad. We want extended vector types to appear built-in.
1955 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) {
1956 if (ExtVectorDecls[i]->getUnderlyingType() == VT)
1957 return Context.getTypedefType(ExtVectorDecls[i]);
1959 return VT; // should never get here (a typedef type should always be found).
1962 static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl,
1963 IdentifierInfo &Member,
1964 const Selector &Sel,
1965 ASTContext &Context) {
1967 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Context, &Member))
1969 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Context, Sel))
1972 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(),
1973 E = PDecl->protocol_end(); I != E; ++I) {
1974 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel,
1981 static Decl *FindGetterNameDecl(const ObjCObjectPointerType *QIdTy,
1982 IdentifierInfo &Member,
1983 const Selector &Sel,
1984 ASTContext &Context) {
1985 // Check protocols on qualified interfaces.
1987 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(),
1988 E = QIdTy->qual_end(); I != E; ++I) {
1989 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, &Member)) {
1993 // Also must look for a getter name which uses property syntax.
1994 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Context, Sel)) {
2000 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(),
2001 E = QIdTy->qual_end(); I != E; ++I) {
2002 // Search in the protocol-qualifier list of current protocol.
2003 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context);
2011 /// FindMethodInNestedImplementations - Look up a method in current and
2012 /// all base class implementations.
2014 ObjCMethodDecl *Sema::FindMethodInNestedImplementations(
2015 const ObjCInterfaceDecl *IFace,
2016 const Selector &Sel) {
2017 ObjCMethodDecl *Method = 0;
2018 if (ObjCImplementationDecl *ImpDecl
2019 = LookupObjCImplementation(IFace->getIdentifier()))
2020 Method = ImpDecl->getInstanceMethod(Context, Sel);
2022 if (!Method && IFace->getSuperClass())
2023 return FindMethodInNestedImplementations(IFace->getSuperClass(), Sel);
2027 Action::OwningExprResult
2028 Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc,
2029 tok::TokenKind OpKind, SourceLocation MemberLoc,
2030 IdentifierInfo &Member,
2031 DeclPtrTy ObjCImpDecl) {
2032 Expr *BaseExpr = Base.takeAs<Expr>();
2033 assert(BaseExpr && "no record expression");
2035 // Perform default conversions.
2036 DefaultFunctionArrayConversion(BaseExpr);
2038 QualType BaseType = BaseExpr->getType();
2039 assert(!BaseType.isNull() && "no type for member expression");
2041 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr
2042 // must have pointer type, and the accessed type is the pointee.
2043 if (OpKind == tok::arrow) {
2044 if (BaseType->isDependentType())
2045 return Owned(new (Context) CXXUnresolvedMemberExpr(Context,
2048 DeclarationName(&Member),
2050 else if (const PointerType *PT = BaseType->getAsPointerType())
2051 BaseType = PT->getPointeeType();
2052 else if (getLangOptions().CPlusPlus && BaseType->isRecordType())
2053 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc,
2054 MemberLoc, Member));
2056 return ExprError(Diag(MemberLoc,
2057 diag::err_typecheck_member_reference_arrow)
2058 << BaseType << BaseExpr->getSourceRange());
2060 if (BaseType->isDependentType()) {
2061 // Require that the base type isn't a pointer type
2062 // (so we'll report an error for)
2066 // In Obj-C++, however, the above expression is valid, since it could be
2067 // accessing the 'f' property if T is an Obj-C interface. The extra check
2068 // allows this, while still reporting an error if T is a struct pointer.
2069 const PointerType *PT = BaseType->getAsPointerType();
2071 if (!PT || (getLangOptions().ObjC1 &&
2072 !PT->getPointeeType()->isRecordType()))
2073 return Owned(new (Context) CXXUnresolvedMemberExpr(Context,
2076 DeclarationName(&Member),
2081 // Handle field access to simple records. This also handles access to fields
2082 // of the ObjC 'id' struct.
2083 if (const RecordType *RTy = BaseType->getAsRecordType()) {
2084 RecordDecl *RDecl = RTy->getDecl();
2085 if (RequireCompleteType(OpLoc, BaseType,
2086 diag::err_typecheck_incomplete_tag,
2087 BaseExpr->getSourceRange()))
2090 // The record definition is complete, now make sure the member is valid.
2091 // FIXME: Qualified name lookup for C++ is a bit more complicated than this.
2093 = LookupQualifiedName(RDecl, DeclarationName(&Member),
2094 LookupMemberName, false);
2097 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member)
2098 << &Member << BaseExpr->getSourceRange());
2099 if (Result.isAmbiguous()) {
2100 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member),
2101 MemberLoc, BaseExpr->getSourceRange());
2105 NamedDecl *MemberDecl = Result;
2107 // If the decl being referenced had an error, return an error for this
2108 // sub-expr without emitting another error, in order to avoid cascading
2110 if (MemberDecl->isInvalidDecl())
2113 // Check the use of this field
2114 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc))
2117 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) {
2118 // We may have found a field within an anonymous union or struct
2119 // (C++ [class.union]).
2120 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion())
2121 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD,
2124 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref]
2125 // FIXME: Handle address space modifiers
2126 QualType MemberType = FD->getType();
2127 if (const ReferenceType *Ref = MemberType->getAsReferenceType())
2128 MemberType = Ref->getPointeeType();
2130 unsigned combinedQualifiers =
2131 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers();
2132 if (FD->isMutable())
2133 combinedQualifiers &= ~QualType::Const;
2134 MemberType = MemberType.getQualifiedType(combinedQualifiers);
2137 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD,
2138 MemberLoc, MemberType));
2141 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl))
2142 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow,
2144 Var->getType().getNonReferenceType()));
2145 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl))
2146 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow,
2147 MemberFn, MemberLoc,
2148 MemberFn->getType()));
2149 if (OverloadedFunctionDecl *Ovl
2150 = dyn_cast<OverloadedFunctionDecl>(MemberDecl))
2151 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl,
2152 MemberLoc, Context.OverloadTy));
2153 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl))
2154 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow,
2155 Enum, MemberLoc, Enum->getType()));
2156 if (isa<TypeDecl>(MemberDecl))
2157 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type)
2158 << DeclarationName(&Member) << int(OpKind == tok::arrow));
2160 // We found a declaration kind that we didn't expect. This is a
2161 // generic error message that tells the user that she can't refer
2162 // to this member with '.' or '->'.
2163 return ExprError(Diag(MemberLoc,
2164 diag::err_typecheck_member_reference_unknown)
2165 << DeclarationName(&Member) << int(OpKind == tok::arrow));
2168 // Handle access to Objective-C instance variables, such as "Obj->ivar" and
2170 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) {
2171 ObjCInterfaceDecl *ClassDeclared;
2172 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(Context,
2175 // If the decl being referenced had an error, return an error for this
2176 // sub-expr without emitting another error, in order to avoid cascading
2178 if (IV->isInvalidDecl())
2181 // Check whether we can reference this field.
2182 if (DiagnoseUseOfDecl(IV, MemberLoc))
2184 if (IV->getAccessControl() != ObjCIvarDecl::Public &&
2185 IV->getAccessControl() != ObjCIvarDecl::Package) {
2186 ObjCInterfaceDecl *ClassOfMethodDecl = 0;
2187 if (ObjCMethodDecl *MD = getCurMethodDecl())
2188 ClassOfMethodDecl = MD->getClassInterface();
2189 else if (ObjCImpDecl && getCurFunctionDecl()) {
2190 // Case of a c-function declared inside an objc implementation.
2191 // FIXME: For a c-style function nested inside an objc implementation
2192 // class, there is no implementation context available, so we pass
2193 // down the context as argument to this routine. Ideally, this context
2194 // need be passed down in the AST node and somehow calculated from the
2195 // AST for a function decl.
2196 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>();
2197 if (ObjCImplementationDecl *IMPD =
2198 dyn_cast<ObjCImplementationDecl>(ImplDecl))
2199 ClassOfMethodDecl = IMPD->getClassInterface();
2200 else if (ObjCCategoryImplDecl* CatImplClass =
2201 dyn_cast<ObjCCategoryImplDecl>(ImplDecl))
2202 ClassOfMethodDecl = CatImplClass->getClassInterface();
2205 if (IV->getAccessControl() == ObjCIvarDecl::Private) {
2206 if (ClassDeclared != IFTy->getDecl() ||
2207 ClassOfMethodDecl != ClassDeclared)
2208 Diag(MemberLoc, diag::error_private_ivar_access) << IV->getDeclName();
2211 else if (!IFTy->getDecl()->isSuperClassOf(ClassOfMethodDecl))
2212 Diag(MemberLoc, diag::error_protected_ivar_access) << IV->getDeclName();
2215 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(),
2216 MemberLoc, BaseExpr,
2217 OpKind == tok::arrow));
2219 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar)
2220 << IFTy->getDecl()->getDeclName() << &Member
2221 << BaseExpr->getSourceRange());
2224 // Handle Objective-C property access, which is "Obj.property" where Obj is a
2225 // pointer to a (potentially qualified) interface type.
2226 const PointerType *PTy;
2227 const ObjCInterfaceType *IFTy;
2228 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) &&
2229 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) {
2230 ObjCInterfaceDecl *IFace = IFTy->getDecl();
2232 // Search for a declared property first.
2233 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Context,
2235 // Check whether we can reference this property.
2236 if (DiagnoseUseOfDecl(PD, MemberLoc))
2238 QualType ResTy = PD->getType();
2239 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member);
2240 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Context, Sel);
2241 if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc))
2242 ResTy = Getter->getResultType();
2243 return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy,
2244 MemberLoc, BaseExpr));
2247 // Check protocols on qualified interfaces.
2248 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(),
2249 E = IFTy->qual_end(); I != E; ++I)
2250 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context,
2252 // Check whether we can reference this property.
2253 if (DiagnoseUseOfDecl(PD, MemberLoc))
2256 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(),
2257 MemberLoc, BaseExpr));
2260 // If that failed, look for an "implicit" property by seeing if the nullary
2261 // selector is implemented.
2263 // FIXME: The logic for looking up nullary and unary selectors should be
2264 // shared with the code in ActOnInstanceMessage.
2266 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member);
2267 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Context, Sel);
2269 // If this reference is in an @implementation, check for 'private' methods.
2271 Getter = FindMethodInNestedImplementations(IFace, Sel);
2273 // Look through local category implementations associated with the class.
2275 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) {
2276 if (ObjCCategoryImpls[i]->getClassInterface() == IFace)
2277 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Context, Sel);
2281 // Check if we can reference this property.
2282 if (DiagnoseUseOfDecl(Getter, MemberLoc))
2285 // If we found a getter then this may be a valid dot-reference, we
2286 // will look for the matching setter, in case it is needed.
2287 Selector SetterSel =
2288 SelectorTable::constructSetterName(PP.getIdentifierTable(),
2289 PP.getSelectorTable(), &Member);
2290 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(Context, SetterSel);
2292 // If this reference is in an @implementation, also check for 'private'
2294 Setter = FindMethodInNestedImplementations(IFace, SetterSel);
2296 // Look through local category implementations associated with the class.
2298 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) {
2299 if (ObjCCategoryImpls[i]->getClassInterface() == IFace)
2300 Setter = ObjCCategoryImpls[i]->getInstanceMethod(Context, SetterSel);
2304 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
2307 if (Getter || Setter) {
2311 PType = Getter->getResultType();
2313 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(),
2314 E = Setter->param_end(); PI != E; ++PI)
2315 PType = (*PI)->getType();
2317 // FIXME: we must check that the setter has property type.
2318 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType,
2319 Setter, MemberLoc, BaseExpr));
2321 return ExprError(Diag(MemberLoc, diag::err_property_not_found)
2322 << &Member << BaseType);
2324 // Handle properties on qualified "id" protocols.
2325 const ObjCObjectPointerType *QIdTy;
2326 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) {
2327 // Check protocols on qualified interfaces.
2328 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member);
2329 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) {
2330 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) {
2331 // Check the use of this declaration
2332 if (DiagnoseUseOfDecl(PD, MemberLoc))
2335 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(),
2336 MemberLoc, BaseExpr));
2338 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) {
2339 // Check the use of this method.
2340 if (DiagnoseUseOfDecl(OMD, MemberLoc))
2343 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel,
2344 OMD->getResultType(),
2345 OMD, OpLoc, MemberLoc,
2350 return ExprError(Diag(MemberLoc, diag::err_property_not_found)
2351 << &Member << BaseType);
2353 // Handle properties on ObjC 'Class' types.
2354 if (OpKind == tok::period && (BaseType == Context.getObjCClassType())) {
2355 // Also must look for a getter name which uses property syntax.
2356 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member);
2357 if (ObjCMethodDecl *MD = getCurMethodDecl()) {
2358 ObjCInterfaceDecl *IFace = MD->getClassInterface();
2359 ObjCMethodDecl *Getter;
2360 // FIXME: need to also look locally in the implementation.
2361 if ((Getter = IFace->lookupClassMethod(Context, Sel))) {
2362 // Check the use of this method.
2363 if (DiagnoseUseOfDecl(Getter, MemberLoc))
2366 // If we found a getter then this may be a valid dot-reference, we
2367 // will look for the matching setter, in case it is needed.
2368 Selector SetterSel =
2369 SelectorTable::constructSetterName(PP.getIdentifierTable(),
2370 PP.getSelectorTable(), &Member);
2371 ObjCMethodDecl *Setter = IFace->lookupClassMethod(Context, SetterSel);
2373 // If this reference is in an @implementation, also check for 'private'
2375 Setter = FindMethodInNestedImplementations(IFace, SetterSel);
2377 // Look through local category implementations associated with the class.
2379 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) {
2380 if (ObjCCategoryImpls[i]->getClassInterface() == IFace)
2381 Setter = ObjCCategoryImpls[i]->getClassMethod(Context, SetterSel);
2385 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
2388 if (Getter || Setter) {
2392 PType = Getter->getResultType();
2394 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(),
2395 E = Setter->param_end(); PI != E; ++PI)
2396 PType = (*PI)->getType();
2398 // FIXME: we must check that the setter has property type.
2399 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType,
2400 Setter, MemberLoc, BaseExpr));
2402 return ExprError(Diag(MemberLoc, diag::err_property_not_found)
2403 << &Member << BaseType);
2407 // Handle 'field access' to vectors, such as 'V.xx'.
2408 if (BaseType->isExtVectorType()) {
2409 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc);
2412 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member,
2416 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union)
2417 << BaseType << BaseExpr->getSourceRange();
2419 // If the user is trying to apply -> or . to a function or function
2420 // pointer, it's probably because they forgot parentheses to call
2421 // the function. Suggest the addition of those parentheses.
2422 if (BaseType == Context.OverloadTy ||
2423 BaseType->isFunctionType() ||
2424 (BaseType->isPointerType() &&
2425 BaseType->getAsPointerType()->isFunctionType())) {
2426 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd());
2427 Diag(Loc, diag::note_member_reference_needs_call)
2428 << CodeModificationHint::CreateInsertion(Loc, "()");
2434 /// ConvertArgumentsForCall - Converts the arguments specified in
2435 /// Args/NumArgs to the parameter types of the function FDecl with
2436 /// function prototype Proto. Call is the call expression itself, and
2437 /// Fn is the function expression. For a C++ member function, this
2438 /// routine does not attempt to convert the object argument. Returns
2439 /// true if the call is ill-formed.
2441 Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn,
2442 FunctionDecl *FDecl,
2443 const FunctionProtoType *Proto,
2444 Expr **Args, unsigned NumArgs,
2445 SourceLocation RParenLoc) {
2446 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by
2447 // assignment, to the types of the corresponding parameter, ...
2448 unsigned NumArgsInProto = Proto->getNumArgs();
2449 unsigned NumArgsToCheck = NumArgs;
2450 bool Invalid = false;
2452 // If too few arguments are available (and we don't have default
2453 // arguments for the remaining parameters), don't make the call.
2454 if (NumArgs < NumArgsInProto) {
2455 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments())
2456 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args)
2457 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange();
2458 // Use default arguments for missing arguments
2459 NumArgsToCheck = NumArgsInProto;
2460 Call->setNumArgs(Context, NumArgsInProto);
2463 // If too many are passed and not variadic, error on the extras and drop
2465 if (NumArgs > NumArgsInProto) {
2466 if (!Proto->isVariadic()) {
2467 Diag(Args[NumArgsInProto]->getLocStart(),
2468 diag::err_typecheck_call_too_many_args)
2469 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange()
2470 << SourceRange(Args[NumArgsInProto]->getLocStart(),
2471 Args[NumArgs-1]->getLocEnd());
2472 // This deletes the extra arguments.
2473 Call->setNumArgs(Context, NumArgsInProto);
2476 NumArgsToCheck = NumArgsInProto;
2479 // Continue to check argument types (even if we have too few/many args).
2480 for (unsigned i = 0; i != NumArgsToCheck; i++) {
2481 QualType ProtoArgType = Proto->getArgType(i);
2487 if (RequireCompleteType(Arg->getSourceRange().getBegin(),
2489 diag::err_call_incomplete_argument,
2490 Arg->getSourceRange()))
2493 // Pass the argument.
2494 if (PerformCopyInitialization(Arg, ProtoArgType, "passing"))
2497 if (FDecl->getParamDecl(i)->hasUnparsedDefaultArg()) {
2498 Diag (Call->getSourceRange().getBegin(),
2499 diag::err_use_of_default_argument_to_function_declared_later) <<
2500 FDecl << cast<CXXRecordDecl>(FDecl->getDeclContext())->getDeclName();
2501 Diag(UnparsedDefaultArgLocs[FDecl->getParamDecl(i)],
2502 diag::note_default_argument_declared_here);
2504 Expr *DefaultExpr = FDecl->getParamDecl(i)->getDefaultArg();
2506 // If the default expression creates temporaries, we need to
2507 // push them to the current stack of expression temporaries so they'll
2508 // be properly destroyed.
2509 if (CXXExprWithTemporaries *E
2510 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) {
2511 assert(!E->shouldDestroyTemporaries() &&
2512 "Can't destroy temporaries in a default argument expr!");
2513 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I)
2514 ExprTemporaries.push_back(E->getTemporary(I));
2518 // We already type-checked the argument, so we know it works.
2519 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i));
2522 QualType ArgType = Arg->getType();
2524 Call->setArg(i, Arg);
2527 // If this is a variadic call, handle args passed through "...".
2528 if (Proto->isVariadic()) {
2529 VariadicCallType CallType = VariadicFunction;
2530 if (Fn->getType()->isBlockPointerType())
2531 CallType = VariadicBlock; // Block
2532 else if (isa<MemberExpr>(Fn))
2533 CallType = VariadicMethod;
2535 // Promote the arguments (C99 6.5.2.2p7).
2536 for (unsigned i = NumArgsInProto; i != NumArgs; i++) {
2537 Expr *Arg = Args[i];
2538 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType);
2539 Call->setArg(i, Arg);
2546 /// ActOnCallExpr - Handle a call to Fn with the specified array of arguments.
2547 /// This provides the location of the left/right parens and a list of comma
2549 Action::OwningExprResult
2550 Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc,
2552 SourceLocation *CommaLocs, SourceLocation RParenLoc) {
2553 unsigned NumArgs = args.size();
2554 Expr *Fn = fn.takeAs<Expr>();
2555 Expr **Args = reinterpret_cast<Expr**>(args.release());
2556 assert(Fn && "no function call expression");
2557 FunctionDecl *FDecl = NULL;
2558 NamedDecl *NDecl = NULL;
2559 DeclarationName UnqualifiedName;
2561 if (getLangOptions().CPlusPlus) {
2562 // Determine whether this is a dependent call inside a C++ template,
2563 // in which case we won't do any semantic analysis now.
2564 // FIXME: Will need to cache the results of name lookup (including ADL) in
2566 bool Dependent = false;
2567 if (Fn->isTypeDependent())
2569 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs))
2573 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs,
2574 Context.DependentTy, RParenLoc));
2576 // Determine whether this is a call to an object (C++ [over.call.object]).
2577 if (Fn->getType()->isRecordType())
2578 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs,
2579 CommaLocs, RParenLoc));
2581 // Determine whether this is a call to a member function.
2582 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens()))
2583 if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) ||
2584 isa<CXXMethodDecl>(MemExpr->getMemberDecl()))
2585 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs,
2586 CommaLocs, RParenLoc));
2589 // If we're directly calling a function, get the appropriate declaration.
2590 DeclRefExpr *DRExpr = NULL;
2594 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr))
2595 FnExpr = IcExpr->getSubExpr();
2596 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) {
2597 // Parentheses around a function disable ADL
2598 // (C++0x [basic.lookup.argdep]p1).
2600 FnExpr = PExpr->getSubExpr();
2601 } else if (isa<UnaryOperator>(FnExpr) &&
2602 cast<UnaryOperator>(FnExpr)->getOpcode()
2603 == UnaryOperator::AddrOf) {
2604 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr();
2605 } else if ((DRExpr = dyn_cast<DeclRefExpr>(FnExpr))) {
2606 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1).
2607 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr);
2609 } else if (UnresolvedFunctionNameExpr *DepName
2610 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) {
2611 UnqualifiedName = DepName->getName();
2614 // Any kind of name that does not refer to a declaration (or
2615 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3).
2621 OverloadedFunctionDecl *Ovl = 0;
2623 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl());
2624 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl());
2625 NDecl = dyn_cast<NamedDecl>(DRExpr->getDecl());
2628 if (Ovl || (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) {
2629 // We don't perform ADL for implicit declarations of builtins.
2630 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit())
2633 // We don't perform ADL in C.
2634 if (!getLangOptions().CPlusPlus)
2638 FDecl = ResolveOverloadedCallFn(Fn, DRExpr? DRExpr->getDecl() : 0,
2639 UnqualifiedName, LParenLoc, Args,
2640 NumArgs, CommaLocs, RParenLoc, ADL);
2644 // Update Fn to refer to the actual function selected.
2646 if (QualifiedDeclRefExpr *QDRExpr
2647 = dyn_cast_or_null<QualifiedDeclRefExpr>(DRExpr))
2648 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(),
2649 QDRExpr->getLocation(),
2651 QDRExpr->getQualifierRange(),
2652 QDRExpr->getQualifier());
2654 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(),
2655 Fn->getSourceRange().getBegin());
2656 Fn->Destroy(Context);
2661 // Promote the function operand.
2662 UsualUnaryConversions(Fn);
2664 // Make the call expr early, before semantic checks. This guarantees cleanup
2665 // of arguments and function on error.
2666 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn,
2671 const FunctionType *FuncT;
2672 if (!Fn->getType()->isBlockPointerType()) {
2673 // C99 6.5.2.2p1 - "The expression that denotes the called function shall
2674 // have type pointer to function".
2675 const PointerType *PT = Fn->getType()->getAsPointerType();
2677 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
2678 << Fn->getType() << Fn->getSourceRange());
2679 FuncT = PT->getPointeeType()->getAsFunctionType();
2680 } else { // This is a block call.
2681 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()->
2682 getAsFunctionType();
2685 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
2686 << Fn->getType() << Fn->getSourceRange());
2688 // Check for a valid return type
2689 if (!FuncT->getResultType()->isVoidType() &&
2690 RequireCompleteType(Fn->getSourceRange().getBegin(),
2691 FuncT->getResultType(),
2692 diag::err_call_incomplete_return,
2693 TheCall->getSourceRange()))
2696 // We know the result type of the call, set it.
2697 TheCall->setType(FuncT->getResultType().getNonReferenceType());
2699 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) {
2700 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs,
2704 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!");
2707 // Check if we have too few/too many template arguments, based
2708 // on our knowledge of the function definition.
2709 const FunctionDecl *Def = 0;
2710 if (FDecl->getBody(Context, Def) && NumArgs != Def->param_size()) {
2711 const FunctionProtoType *Proto =
2712 Def->getType()->getAsFunctionProtoType();
2713 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size())) {
2714 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments)
2715 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange();
2720 // Promote the arguments (C99 6.5.2.2p6).
2721 for (unsigned i = 0; i != NumArgs; i++) {
2722 Expr *Arg = Args[i];
2723 DefaultArgumentPromotion(Arg);
2724 if (RequireCompleteType(Arg->getSourceRange().getBegin(),
2726 diag::err_call_incomplete_argument,
2727 Arg->getSourceRange()))
2729 TheCall->setArg(i, Arg);
2733 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl))
2734 if (!Method->isStatic())
2735 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object)
2736 << Fn->getSourceRange());
2738 // Check for sentinels
2740 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs);
2741 // Do special checking on direct calls to functions.
2743 return CheckFunctionCall(FDecl, TheCall.take());
2745 return CheckBlockCall(NDecl, TheCall.take());
2747 return Owned(TheCall.take());
2750 Action::OwningExprResult
2751 Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty,
2752 SourceLocation RParenLoc, ExprArg InitExpr) {
2753 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type");
2754 QualType literalType = QualType::getFromOpaquePtr(Ty);
2755 // FIXME: put back this assert when initializers are worked out.
2756 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression");
2757 Expr *literalExpr = static_cast<Expr*>(InitExpr.get());
2759 if (literalType->isArrayType()) {
2760 if (literalType->isVariableArrayType())
2761 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init)
2762 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()));
2763 } else if (!literalType->isDependentType() &&
2764 RequireCompleteType(LParenLoc, literalType,
2765 diag::err_typecheck_decl_incomplete_type,
2766 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())))
2769 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc,
2770 DeclarationName(), /*FIXME:DirectInit=*/false))
2773 bool isFileScope = getCurFunctionOrMethodDecl() == 0;
2774 if (isFileScope) { // 6.5.2.5p3
2775 if (CheckForConstantInitializer(literalExpr, literalType))
2779 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType,
2780 literalExpr, isFileScope));
2783 Action::OwningExprResult
2784 Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist,
2785 SourceLocation RBraceLoc) {
2786 unsigned NumInit = initlist.size();
2787 Expr **InitList = reinterpret_cast<Expr**>(initlist.release());
2789 // Semantic analysis for initializers is done by ActOnDeclarator() and
2790 // CheckInitializer() - it requires knowledge of the object being intialized.
2792 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit,
2794 E->setType(Context.VoidTy); // FIXME: just a place holder for now.
2798 /// CheckCastTypes - Check type constraints for casting between types.
2799 bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) {
2800 UsualUnaryConversions(castExpr);
2802 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression
2803 // type needs to be scalar.
2804 if (castType->isVoidType()) {
2805 // Cast to void allows any expr type.
2806 } else if (castType->isDependentType() || castExpr->isTypeDependent()) {
2807 // We can't check any more until template instantiation time.
2808 } else if (!castType->isScalarType() && !castType->isVectorType()) {
2809 if (Context.getCanonicalType(castType).getUnqualifiedType() ==
2810 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) &&
2811 (castType->isStructureType() || castType->isUnionType())) {
2812 // GCC struct/union extension: allow cast to self.
2813 // FIXME: Check that the cast destination type is complete.
2814 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar)
2815 << castType << castExpr->getSourceRange();
2816 } else if (castType->isUnionType()) {
2817 // GCC cast to union extension
2818 RecordDecl *RD = castType->getAsRecordType()->getDecl();
2819 RecordDecl::field_iterator Field, FieldEnd;
2820 for (Field = RD->field_begin(Context), FieldEnd = RD->field_end(Context);
2821 Field != FieldEnd; ++Field) {
2822 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() ==
2823 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) {
2824 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union)
2825 << castExpr->getSourceRange();
2829 if (Field == FieldEnd)
2830 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type)
2831 << castExpr->getType() << castExpr->getSourceRange();
2833 // Reject any other conversions to non-scalar types.
2834 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar)
2835 << castType << castExpr->getSourceRange();
2837 } else if (!castExpr->getType()->isScalarType() &&
2838 !castExpr->getType()->isVectorType()) {
2839 return Diag(castExpr->getLocStart(),
2840 diag::err_typecheck_expect_scalar_operand)
2841 << castExpr->getType() << castExpr->getSourceRange();
2842 } else if (castExpr->getType()->isVectorType()) {
2843 if (CheckVectorCast(TyR, castExpr->getType(), castType))
2845 } else if (castType->isVectorType()) {
2846 if (CheckVectorCast(TyR, castType, castExpr->getType()))
2848 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) {
2849 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR;
2850 } else if (!castType->isArithmeticType()) {
2851 QualType castExprType = castExpr->getType();
2852 if (!castExprType->isIntegralType() && castExprType->isArithmeticType())
2853 return Diag(castExpr->getLocStart(),
2854 diag::err_cast_pointer_from_non_pointer_int)
2855 << castExprType << castExpr->getSourceRange();
2856 } else if (!castExpr->getType()->isArithmeticType()) {
2857 if (!castType->isIntegralType() && castType->isArithmeticType())
2858 return Diag(castExpr->getLocStart(),
2859 diag::err_cast_pointer_to_non_pointer_int)
2860 << castType << castExpr->getSourceRange();
2862 if (isa<ObjCSelectorExpr>(castExpr))
2863 return Diag(castExpr->getLocStart(), diag::err_cast_selector_expr);
2867 bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) {
2868 assert(VectorTy->isVectorType() && "Not a vector type!");
2870 if (Ty->isVectorType() || Ty->isIntegerType()) {
2871 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty))
2872 return Diag(R.getBegin(),
2873 Ty->isVectorType() ?
2874 diag::err_invalid_conversion_between_vectors :
2875 diag::err_invalid_conversion_between_vector_and_integer)
2876 << VectorTy << Ty << R;
2878 return Diag(R.getBegin(),
2879 diag::err_invalid_conversion_between_vector_and_scalar)
2880 << VectorTy << Ty << R;
2885 Action::OwningExprResult
2886 Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty,
2887 SourceLocation RParenLoc, ExprArg Op) {
2888 assert((Ty != 0) && (Op.get() != 0) &&
2889 "ActOnCastExpr(): missing type or expr");
2891 Expr *castExpr = Op.takeAs<Expr>();
2892 QualType castType = QualType::getFromOpaquePtr(Ty);
2894 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr))
2896 return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType,
2897 LParenLoc, RParenLoc));
2900 /// Note that lhs is not null here, even if this is the gnu "x ?: y" extension.
2901 /// In that case, lhs = cond.
2903 QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS,
2904 SourceLocation QuestionLoc) {
2905 // C++ is sufficiently different to merit its own checker.
2906 if (getLangOptions().CPlusPlus)
2907 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc);
2909 UsualUnaryConversions(Cond);
2910 UsualUnaryConversions(LHS);
2911 UsualUnaryConversions(RHS);
2912 QualType CondTy = Cond->getType();
2913 QualType LHSTy = LHS->getType();
2914 QualType RHSTy = RHS->getType();
2916 // first, check the condition.
2917 if (!CondTy->isScalarType()) { // C99 6.5.15p2
2918 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar)
2923 // Now check the two expressions.
2925 // If both operands have arithmetic type, do the usual arithmetic conversions
2926 // to find a common type: C99 6.5.15p3,5.
2927 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) {
2928 UsualArithmeticConversions(LHS, RHS);
2929 return LHS->getType();
2932 // If both operands are the same structure or union type, the result is that
2934 if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3
2935 if (const RecordType *RHSRT = RHSTy->getAsRecordType())
2936 if (LHSRT->getDecl() == RHSRT->getDecl())
2937 // "If both the operands have structure or union type, the result has
2938 // that type." This implies that CV qualifiers are dropped.
2939 return LHSTy.getUnqualifiedType();
2940 // FIXME: Type of conditional expression must be complete in C mode.
2943 // C99 6.5.15p5: "If both operands have void type, the result has void type."
2944 // The following || allows only one side to be void (a GCC-ism).
2945 if (LHSTy->isVoidType() || RHSTy->isVoidType()) {
2946 if (!LHSTy->isVoidType())
2947 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void)
2948 << RHS->getSourceRange();
2949 if (!RHSTy->isVoidType())
2950 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void)
2951 << LHS->getSourceRange();
2952 ImpCastExprToType(LHS, Context.VoidTy);
2953 ImpCastExprToType(RHS, Context.VoidTy);
2954 return Context.VoidTy;
2956 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has
2957 // the type of the other operand."
2958 if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() ||
2959 Context.isObjCObjectPointerType(LHSTy)) &&
2960 RHS->isNullPointerConstant(Context)) {
2961 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer.
2964 if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() ||
2965 Context.isObjCObjectPointerType(RHSTy)) &&
2966 LHS->isNullPointerConstant(Context)) {
2967 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer.
2971 const PointerType *LHSPT = LHSTy->getAsPointerType();
2972 const PointerType *RHSPT = RHSTy->getAsPointerType();
2973 const BlockPointerType *LHSBPT = LHSTy->getAsBlockPointerType();
2974 const BlockPointerType *RHSBPT = RHSTy->getAsBlockPointerType();
2976 // Handle the case where both operands are pointers before we handle null
2977 // pointer constants in case both operands are null pointer constants.
2978 if ((LHSPT || LHSBPT) && (RHSPT || RHSBPT)) { // C99 6.5.15p3,6
2979 // get the "pointed to" types
2980 QualType lhptee = (LHSPT ? LHSPT->getPointeeType()
2981 : LHSBPT->getPointeeType());
2982 QualType rhptee = (RHSPT ? RHSPT->getPointeeType()
2983 : RHSBPT->getPointeeType());
2985 // ignore qualifiers on void (C99 6.5.15p3, clause 6)
2986 if (lhptee->isVoidType()
2987 && (RHSBPT || rhptee->isIncompleteOrObjectType())) {
2988 // Figure out necessary qualifiers (C99 6.5.15p6)
2989 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers());
2990 QualType destType = Context.getPointerType(destPointee);
2991 ImpCastExprToType(LHS, destType); // add qualifiers if necessary
2992 ImpCastExprToType(RHS, destType); // promote to void*
2995 if (rhptee->isVoidType()
2996 && (LHSBPT || lhptee->isIncompleteOrObjectType())) {
2997 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers());
2998 QualType destType = Context.getPointerType(destPointee);
2999 ImpCastExprToType(LHS, destType); // add qualifiers if necessary
3000 ImpCastExprToType(RHS, destType); // promote to void*
3004 bool sameKind = (LHSPT && RHSPT) || (LHSBPT && RHSBPT);
3006 && Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
3007 // Two identical pointer types are always compatible.
3011 QualType compositeType = LHSTy;
3013 // If either type is an Objective-C object type then check
3014 // compatibility according to Objective-C.
3015 if (Context.isObjCObjectPointerType(LHSTy) ||
3016 Context.isObjCObjectPointerType(RHSTy)) {
3017 // If both operands are interfaces and either operand can be
3018 // assigned to the other, use that type as the composite
3019 // type. This allows
3020 // xxx ? (A*) a : (B*) b
3021 // where B is a subclass of A.
3023 // Additionally, as for assignment, if either type is 'id'
3024 // allow silent coercion. Finally, if the types are
3025 // incompatible then make sure to use 'id' as the composite
3026 // type so the result is acceptable for sending messages to.
3028 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'.
3029 // It could return the composite type.
3030 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType();
3031 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType();
3032 if (LHSIface && RHSIface &&
3033 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) {
3034 compositeType = LHSTy;
3035 } else if (LHSIface && RHSIface &&
3036 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) {
3037 compositeType = RHSTy;
3038 } else if (Context.isObjCIdStructType(lhptee) ||
3039 Context.isObjCIdStructType(rhptee)) {
3040 compositeType = Context.getObjCIdType();
3041 } else if (LHSBPT || RHSBPT) {
3043 || !Context.typesAreCompatible(lhptee.getUnqualifiedType(),
3044 rhptee.getUnqualifiedType()))
3045 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
3046 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange();
3049 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands)
3051 << LHS->getSourceRange() << RHS->getSourceRange();
3052 QualType incompatTy = Context.getObjCIdType();
3053 ImpCastExprToType(LHS, incompatTy);
3054 ImpCastExprToType(RHS, incompatTy);
3057 } else if (!sameKind
3058 || !Context.typesAreCompatible(lhptee.getUnqualifiedType(),
3059 rhptee.getUnqualifiedType())) {
3060 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers)
3061 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange();
3062 // In this situation, we assume void* type. No especially good
3063 // reason, but this is what gcc does, and we do have to pick
3064 // to get a consistent AST.
3065 QualType incompatTy = Context.getPointerType(Context.VoidTy);
3066 ImpCastExprToType(LHS, incompatTy);
3067 ImpCastExprToType(RHS, incompatTy);
3070 // The pointer types are compatible.
3071 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to
3072 // differently qualified versions of compatible types, the result type is
3073 // a pointer to an appropriately qualified version of the *composite*
3075 // FIXME: Need to calculate the composite type.
3076 // FIXME: Need to add qualifiers
3077 ImpCastExprToType(LHS, compositeType);
3078 ImpCastExprToType(RHS, compositeType);
3079 return compositeType;
3082 // GCC compatibility: soften pointer/integer mismatch.
3083 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) {
3084 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch)
3085 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange();
3086 ImpCastExprToType(LHS, RHSTy); // promote the integer to a pointer.
3089 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) {
3090 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch)
3091 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange();
3092 ImpCastExprToType(RHS, LHSTy); // promote the integer to a pointer.
3096 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type
3097 // evaluates to "struct objc_object *" (and is handled above when comparing
3098 // id with statically typed objects).
3099 if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) {
3100 // GCC allows qualified id and any Objective-C type to devolve to
3101 // id. Currently localizing to here until clear this should be
3102 // part of ObjCQualifiedIdTypesAreCompatible.
3103 if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) ||
3104 (LHSTy->isObjCQualifiedIdType() &&
3105 Context.isObjCObjectPointerType(RHSTy)) ||
3106 (RHSTy->isObjCQualifiedIdType() &&
3107 Context.isObjCObjectPointerType(LHSTy))) {
3108 // FIXME: This is not the correct composite type. This only happens to
3109 // work because id can more or less be used anywhere, however this may
3110 // change the type of method sends.
3112 // FIXME: gcc adds some type-checking of the arguments and emits
3113 // (confusing) incompatible comparison warnings in some
3114 // cases. Investigate.
3115 QualType compositeType = Context.getObjCIdType();
3116 ImpCastExprToType(LHS, compositeType);
3117 ImpCastExprToType(RHS, compositeType);
3118 return compositeType;
3122 // Otherwise, the operands are not compatible.
3123 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
3124 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange();
3128 /// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null
3129 /// in the case of a the GNU conditional expr extension.
3130 Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc,
3131 SourceLocation ColonLoc,
3132 ExprArg Cond, ExprArg LHS,
3134 Expr *CondExpr = (Expr *) Cond.get();
3135 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get();
3137 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS
3138 // was the condition.
3139 bool isLHSNull = LHSExpr == 0;
3143 QualType result = CheckConditionalOperands(CondExpr, LHSExpr,
3144 RHSExpr, QuestionLoc);
3145 if (result.isNull())
3151 return Owned(new (Context) ConditionalOperator(CondExpr,
3152 isLHSNull ? 0 : LHSExpr,
3157 // CheckPointerTypesForAssignment - This is a very tricky routine (despite
3158 // being closely modeled after the C99 spec:-). The odd characteristic of this
3159 // routine is it effectively iqnores the qualifiers on the top level pointee.
3160 // This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3].
3161 // FIXME: add a couple examples in this comment.
3162 Sema::AssignConvertType
3163 Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) {
3164 QualType lhptee, rhptee;
3166 // get the "pointed to" type (ignoring qualifiers at the top level)
3167 lhptee = lhsType->getAsPointerType()->getPointeeType();
3168 rhptee = rhsType->getAsPointerType()->getPointeeType();
3170 // make sure we operate on the canonical type
3171 lhptee = Context.getCanonicalType(lhptee);
3172 rhptee = Context.getCanonicalType(rhptee);
3174 AssignConvertType ConvTy = Compatible;
3176 // C99 6.5.16.1p1: This following citation is common to constraints
3177 // 3 & 4 (below). ...and the type *pointed to* by the left has all the
3178 // qualifiers of the type *pointed to* by the right;
3179 // FIXME: Handle ExtQualType
3180 if (!lhptee.isAtLeastAsQualifiedAs(rhptee))
3181 ConvTy = CompatiblePointerDiscardsQualifiers;
3183 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or
3184 // incomplete type and the other is a pointer to a qualified or unqualified
3185 // version of void...
3186 if (lhptee->isVoidType()) {
3187 if (rhptee->isIncompleteOrObjectType())
3190 // As an extension, we allow cast to/from void* to function pointer.
3191 assert(rhptee->isFunctionType());
3192 return FunctionVoidPointer;
3195 if (rhptee->isVoidType()) {
3196 if (lhptee->isIncompleteOrObjectType())
3199 // As an extension, we allow cast to/from void* to function pointer.
3200 assert(lhptee->isFunctionType());
3201 return FunctionVoidPointer;
3203 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or
3204 // unqualified versions of compatible types, ...
3205 lhptee = lhptee.getUnqualifiedType();
3206 rhptee = rhptee.getUnqualifiedType();
3207 if (!Context.typesAreCompatible(lhptee, rhptee)) {
3208 // Check if the pointee types are compatible ignoring the sign.
3209 // We explicitly check for char so that we catch "char" vs
3210 // "unsigned char" on systems where "char" is unsigned.
3211 if (lhptee->isCharType()) {
3212 lhptee = Context.UnsignedCharTy;
3213 } else if (lhptee->isSignedIntegerType()) {
3214 lhptee = Context.getCorrespondingUnsignedType(lhptee);
3216 if (rhptee->isCharType()) {
3217 rhptee = Context.UnsignedCharTy;
3218 } else if (rhptee->isSignedIntegerType()) {
3219 rhptee = Context.getCorrespondingUnsignedType(rhptee);
3221 if (lhptee == rhptee) {
3222 // Types are compatible ignoring the sign. Qualifier incompatibility
3223 // takes priority over sign incompatibility because the sign
3224 // warning can be disabled.
3225 if (ConvTy != Compatible)
3227 return IncompatiblePointerSign;
3229 // General pointer incompatibility takes priority over qualifiers.
3230 return IncompatiblePointer;
3235 /// CheckBlockPointerTypesForAssignment - This routine determines whether two
3236 /// block pointer types are compatible or whether a block and normal pointer
3237 /// are compatible. It is more restrict than comparing two function pointer
3239 Sema::AssignConvertType
3240 Sema::CheckBlockPointerTypesForAssignment(QualType lhsType,
3242 QualType lhptee, rhptee;
3244 // get the "pointed to" type (ignoring qualifiers at the top level)
3245 lhptee = lhsType->getAsBlockPointerType()->getPointeeType();
3246 rhptee = rhsType->getAsBlockPointerType()->getPointeeType();
3248 // make sure we operate on the canonical type
3249 lhptee = Context.getCanonicalType(lhptee);
3250 rhptee = Context.getCanonicalType(rhptee);
3252 AssignConvertType ConvTy = Compatible;
3254 // For blocks we enforce that qualifiers are identical.
3255 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers())
3256 ConvTy = CompatiblePointerDiscardsQualifiers;
3258 if (!Context.typesAreCompatible(lhptee, rhptee))
3259 return IncompatibleBlockPointer;
3263 /// CheckAssignmentConstraints (C99 6.5.16) - This routine currently
3264 /// has code to accommodate several GCC extensions when type checking
3265 /// pointers. Here are some objectionable examples that GCC considers warnings:
3269 /// struct foo *pfoo;
3271 /// pint = pshort; // warning: assignment from incompatible pointer type
3272 /// a = pint; // warning: assignment makes integer from pointer without a cast
3273 /// pint = a; // warning: assignment makes pointer from integer without a cast
3274 /// pint = pfoo; // warning: assignment from incompatible pointer type
3276 /// As a result, the code for dealing with pointers is more complex than the
3277 /// C99 spec dictates.
3279 Sema::AssignConvertType
3280 Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) {
3281 // Get canonical types. We're not formatting these types, just comparing
3283 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType();
3284 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType();
3286 if (lhsType == rhsType)
3287 return Compatible; // Common case: fast path an exact match.
3289 // If the left-hand side is a reference type, then we are in a
3290 // (rare!) case where we've allowed the use of references in C,
3291 // e.g., as a parameter type in a built-in function. In this case,
3292 // just make sure that the type referenced is compatible with the
3293 // right-hand side type. The caller is responsible for adjusting
3294 // lhsType so that the resulting expression does not have reference
3296 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) {
3297 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType))
3299 return Incompatible;
3302 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) {
3303 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false))
3305 // Relax integer conversions like we do for pointers below.
3306 if (rhsType->isIntegerType())
3307 return IntToPointer;
3308 if (lhsType->isIntegerType())
3309 return PointerToInt;
3310 return IncompatibleObjCQualifiedId;
3313 if (lhsType->isVectorType() || rhsType->isVectorType()) {
3314 // For ExtVector, allow vector splats; float -> <n x float>
3315 if (const ExtVectorType *LV = lhsType->getAsExtVectorType())
3316 if (LV->getElementType() == rhsType)
3319 // If we are allowing lax vector conversions, and LHS and RHS are both
3320 // vectors, the total size only needs to be the same. This is a bitcast;
3321 // no bits are changed but the result type is different.
3322 if (getLangOptions().LaxVectorConversions &&
3323 lhsType->isVectorType() && rhsType->isVectorType()) {
3324 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType))
3325 return IncompatibleVectors;
3327 return Incompatible;
3330 if (lhsType->isArithmeticType() && rhsType->isArithmeticType())
3333 if (isa<PointerType>(lhsType)) {
3334 if (rhsType->isIntegerType())
3335 return IntToPointer;
3337 if (isa<PointerType>(rhsType))
3338 return CheckPointerTypesForAssignment(lhsType, rhsType);
3340 if (rhsType->getAsBlockPointerType()) {
3341 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType())
3344 // Treat block pointers as objects.
3345 if (getLangOptions().ObjC1 &&
3346 lhsType == Context.getCanonicalType(Context.getObjCIdType()))
3349 return Incompatible;
3352 if (isa<BlockPointerType>(lhsType)) {
3353 if (rhsType->isIntegerType())
3354 return IntToBlockPointer;
3356 // Treat block pointers as objects.
3357 if (getLangOptions().ObjC1 &&
3358 rhsType == Context.getCanonicalType(Context.getObjCIdType()))
3361 if (rhsType->isBlockPointerType())
3362 return CheckBlockPointerTypesForAssignment(lhsType, rhsType);
3364 if (const PointerType *RHSPT = rhsType->getAsPointerType()) {
3365 if (RHSPT->getPointeeType()->isVoidType())
3368 return Incompatible;
3371 if (isa<PointerType>(rhsType)) {
3372 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer.
3373 if (lhsType == Context.BoolTy)
3376 if (lhsType->isIntegerType())
3377 return PointerToInt;
3379 if (isa<PointerType>(lhsType))
3380 return CheckPointerTypesForAssignment(lhsType, rhsType);
3382 if (isa<BlockPointerType>(lhsType) &&
3383 rhsType->getAsPointerType()->getPointeeType()->isVoidType())
3385 return Incompatible;
3388 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) {
3389 if (Context.typesAreCompatible(lhsType, rhsType))
3392 return Incompatible;
3395 /// \brief Constructs a transparent union from an expression that is
3396 /// used to initialize the transparent union.
3397 static void ConstructTransparentUnion(ASTContext &C, Expr *&E,
3398 QualType UnionType, FieldDecl *Field) {
3399 // Build an initializer list that designates the appropriate member
3400 // of the transparent union.
3401 InitListExpr *Initializer = new (C) InitListExpr(SourceLocation(),
3404 Initializer->setType(UnionType);
3405 Initializer->setInitializedFieldInUnion(Field);
3407 // Build a compound literal constructing a value of the transparent
3408 // union type from this initializer list.
3409 E = new (C) CompoundLiteralExpr(SourceLocation(), UnionType, Initializer,
3413 Sema::AssignConvertType
3414 Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) {
3415 QualType FromType = rExpr->getType();
3417 // If the ArgType is a Union type, we want to handle a potential
3418 // transparent_union GCC extension.
3419 const RecordType *UT = ArgType->getAsUnionType();
3420 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>(Context))
3421 return Incompatible;
3423 // The field to initialize within the transparent union.
3424 RecordDecl *UD = UT->getDecl();
3425 FieldDecl *InitField = 0;
3426 // It's compatible if the expression matches any of the fields.
3427 for (RecordDecl::field_iterator it = UD->field_begin(Context),
3428 itend = UD->field_end(Context);
3429 it != itend; ++it) {
3430 if (it->getType()->isPointerType()) {
3431 // If the transparent union contains a pointer type, we allow:
3433 // 2) null pointer constant
3434 if (FromType->isPointerType())
3435 if (FromType->getAsPointerType()->getPointeeType()->isVoidType()) {
3436 ImpCastExprToType(rExpr, it->getType());
3441 if (rExpr->isNullPointerConstant(Context)) {
3442 ImpCastExprToType(rExpr, it->getType());
3448 if (CheckAssignmentConstraints(it->getType(), rExpr->getType())
3456 return Incompatible;
3458 ConstructTransparentUnion(Context, rExpr, ArgType, InitField);
3462 Sema::AssignConvertType
3463 Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) {
3464 if (getLangOptions().CPlusPlus) {
3465 if (!lhsType->isRecordType()) {
3466 // C++ 5.17p3: If the left operand is not of class type, the
3467 // expression is implicitly converted (C++ 4) to the
3468 // cv-unqualified type of the left operand.
3469 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(),
3471 return Incompatible;
3475 // FIXME: Currently, we fall through and treat C++ classes like C
3479 // C99 6.5.16.1p1: the left operand is a pointer and the right is
3480 // a null pointer constant.
3481 if ((lhsType->isPointerType() ||
3482 lhsType->isObjCQualifiedIdType() ||
3483 lhsType->isBlockPointerType())
3484 && rExpr->isNullPointerConstant(Context)) {
3485 ImpCastExprToType(rExpr, lhsType);
3489 // This check seems unnatural, however it is necessary to ensure the proper
3490 // conversion of functions/arrays. If the conversion were done for all
3491 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary
3492 // expressions that surpress this implicit conversion (&, sizeof).
3494 // Suppress this for references: C++ 8.5.3p5.
3495 if (!lhsType->isReferenceType())
3496 DefaultFunctionArrayConversion(rExpr);
3498 Sema::AssignConvertType result =
3499 CheckAssignmentConstraints(lhsType, rExpr->getType());
3501 // C99 6.5.16.1p2: The value of the right operand is converted to the
3502 // type of the assignment expression.
3503 // CheckAssignmentConstraints allows the left-hand side to be a reference,
3504 // so that we can use references in built-in functions even in C.
3505 // The getNonReferenceType() call makes sure that the resulting expression
3506 // does not have reference type.
3507 if (result != Incompatible && rExpr->getType() != lhsType)
3508 ImpCastExprToType(rExpr, lhsType.getNonReferenceType());
3512 QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) {
3513 Diag(Loc, diag::err_typecheck_invalid_operands)
3514 << lex->getType() << rex->getType()
3515 << lex->getSourceRange() << rex->getSourceRange();
3519 inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex,
3521 // For conversion purposes, we ignore any qualifiers.
3522 // For example, "const float" and "float" are equivalent.
3524 Context.getCanonicalType(lex->getType()).getUnqualifiedType();
3526 Context.getCanonicalType(rex->getType()).getUnqualifiedType();
3528 // If the vector types are identical, return.
3529 if (lhsType == rhsType)
3532 // Handle the case of a vector & extvector type of the same size and element
3533 // type. It would be nice if we only had one vector type someday.
3534 if (getLangOptions().LaxVectorConversions) {
3535 // FIXME: Should we warn here?
3536 if (const VectorType *LV = lhsType->getAsVectorType()) {
3537 if (const VectorType *RV = rhsType->getAsVectorType())
3538 if (LV->getElementType() == RV->getElementType() &&
3539 LV->getNumElements() == RV->getNumElements()) {
3540 return lhsType->isExtVectorType() ? lhsType : rhsType;
3545 // If the lhs is an extended vector and the rhs is a scalar of the same type
3546 // or a literal, promote the rhs to the vector type.
3547 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) {
3548 QualType eltType = V->getElementType();
3550 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) ||
3551 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) ||
3552 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) {
3553 ImpCastExprToType(rex, lhsType);
3558 // If the rhs is an extended vector and the lhs is a scalar of the same type,
3559 // promote the lhs to the vector type.
3560 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) {
3561 QualType eltType = V->getElementType();
3563 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) ||
3564 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) ||
3565 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) {
3566 ImpCastExprToType(lex, rhsType);
3571 // You cannot convert between vector values of different size.
3572 Diag(Loc, diag::err_typecheck_vector_not_convertable)
3573 << lex->getType() << rex->getType()
3574 << lex->getSourceRange() << rex->getSourceRange();
3578 inline QualType Sema::CheckMultiplyDivideOperands(
3579 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign)
3581 if (lex->getType()->isVectorType() || rex->getType()->isVectorType())
3582 return CheckVectorOperands(Loc, lex, rex);
3584 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign);
3586 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType())
3588 return InvalidOperands(Loc, lex, rex);
3591 inline QualType Sema::CheckRemainderOperands(
3592 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign)
3594 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) {
3595 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType())
3596 return CheckVectorOperands(Loc, lex, rex);
3597 return InvalidOperands(Loc, lex, rex);
3600 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign);
3602 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType())
3604 return InvalidOperands(Loc, lex, rex);
3607 inline QualType Sema::CheckAdditionOperands( // C99 6.5.6
3608 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy)
3610 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) {
3611 QualType compType = CheckVectorOperands(Loc, lex, rex);
3612 if (CompLHSTy) *CompLHSTy = compType;
3616 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy);
3618 // handle the common case first (both operands are arithmetic).
3619 if (lex->getType()->isArithmeticType() &&
3620 rex->getType()->isArithmeticType()) {
3621 if (CompLHSTy) *CompLHSTy = compType;
3625 // Put any potential pointer into PExp
3626 Expr* PExp = lex, *IExp = rex;
3627 if (IExp->getType()->isPointerType())
3628 std::swap(PExp, IExp);
3630 if (const PointerType *PTy = PExp->getType()->getAsPointerType()) {
3631 if (IExp->getType()->isIntegerType()) {
3632 QualType PointeeTy = PTy->getPointeeType();
3633 // Check for arithmetic on pointers to incomplete types.
3634 if (PointeeTy->isVoidType()) {
3635 if (getLangOptions().CPlusPlus) {
3636 Diag(Loc, diag::err_typecheck_pointer_arith_void_type)
3637 << lex->getSourceRange() << rex->getSourceRange();
3641 // GNU extension: arithmetic on pointer to void
3642 Diag(Loc, diag::ext_gnu_void_ptr)
3643 << lex->getSourceRange() << rex->getSourceRange();
3644 } else if (PointeeTy->isFunctionType()) {
3645 if (getLangOptions().CPlusPlus) {
3646 Diag(Loc, diag::err_typecheck_pointer_arith_function_type)
3647 << lex->getType() << lex->getSourceRange();
3651 // GNU extension: arithmetic on pointer to function
3652 Diag(Loc, diag::ext_gnu_ptr_func_arith)
3653 << lex->getType() << lex->getSourceRange();
3654 } else if (!PTy->isDependentType() &&
3655 RequireCompleteType(Loc, PointeeTy,
3656 diag::err_typecheck_arithmetic_incomplete_type,
3657 PExp->getSourceRange(), SourceRange(),
3661 // Diagnose bad cases where we step over interface counts.
3662 if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) {
3663 Diag(Loc, diag::err_arithmetic_nonfragile_interface)
3664 << PointeeTy << PExp->getSourceRange();
3669 QualType LHSTy = lex->getType();
3670 if (LHSTy->isPromotableIntegerType())
3671 LHSTy = Context.IntTy;
3673 QualType T = isPromotableBitField(lex, Context);
3680 return PExp->getType();
3684 return InvalidOperands(Loc, lex, rex);
3688 QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex,
3689 SourceLocation Loc, QualType* CompLHSTy) {
3690 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) {
3691 QualType compType = CheckVectorOperands(Loc, lex, rex);
3692 if (CompLHSTy) *CompLHSTy = compType;
3696 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy);
3698 // Enforce type constraints: C99 6.5.6p3.
3700 // Handle the common case first (both operands are arithmetic).
3701 if (lex->getType()->isArithmeticType()
3702 && rex->getType()->isArithmeticType()) {
3703 if (CompLHSTy) *CompLHSTy = compType;
3707 // Either ptr - int or ptr - ptr.
3708 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) {
3709 QualType lpointee = LHSPTy->getPointeeType();
3711 // The LHS must be an completely-defined object type.
3713 bool ComplainAboutVoid = false;
3714 Expr *ComplainAboutFunc = 0;
3715 if (lpointee->isVoidType()) {
3716 if (getLangOptions().CPlusPlus) {
3717 Diag(Loc, diag::err_typecheck_pointer_arith_void_type)
3718 << lex->getSourceRange() << rex->getSourceRange();
3722 // GNU C extension: arithmetic on pointer to void
3723 ComplainAboutVoid = true;
3724 } else if (lpointee->isFunctionType()) {
3725 if (getLangOptions().CPlusPlus) {
3726 Diag(Loc, diag::err_typecheck_pointer_arith_function_type)
3727 << lex->getType() << lex->getSourceRange();
3731 // GNU C extension: arithmetic on pointer to function
3732 ComplainAboutFunc = lex;
3733 } else if (!lpointee->isDependentType() &&
3734 RequireCompleteType(Loc, lpointee,
3735 diag::err_typecheck_sub_ptr_object,
3736 lex->getSourceRange(),
3741 // Diagnose bad cases where we step over interface counts.
3742 if (lpointee->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) {
3743 Diag(Loc, diag::err_arithmetic_nonfragile_interface)
3744 << lpointee << lex->getSourceRange();
3748 // The result type of a pointer-int computation is the pointer type.
3749 if (rex->getType()->isIntegerType()) {
3750 if (ComplainAboutVoid)
3751 Diag(Loc, diag::ext_gnu_void_ptr)
3752 << lex->getSourceRange() << rex->getSourceRange();
3753 if (ComplainAboutFunc)
3754 Diag(Loc, diag::ext_gnu_ptr_func_arith)
3755 << ComplainAboutFunc->getType()
3756 << ComplainAboutFunc->getSourceRange();
3758 if (CompLHSTy) *CompLHSTy = lex->getType();
3759 return lex->getType();
3762 // Handle pointer-pointer subtractions.
3763 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) {
3764 QualType rpointee = RHSPTy->getPointeeType();
3766 // RHS must be a completely-type object type.
3767 // Handle the GNU void* extension.
3768 if (rpointee->isVoidType()) {
3769 if (getLangOptions().CPlusPlus) {
3770 Diag(Loc, diag::err_typecheck_pointer_arith_void_type)
3771 << lex->getSourceRange() << rex->getSourceRange();
3775 ComplainAboutVoid = true;
3776 } else if (rpointee->isFunctionType()) {
3777 if (getLangOptions().CPlusPlus) {
3778 Diag(Loc, diag::err_typecheck_pointer_arith_function_type)
3779 << rex->getType() << rex->getSourceRange();
3783 // GNU extension: arithmetic on pointer to function
3784 if (!ComplainAboutFunc)
3785 ComplainAboutFunc = rex;
3786 } else if (!rpointee->isDependentType() &&
3787 RequireCompleteType(Loc, rpointee,
3788 diag::err_typecheck_sub_ptr_object,
3789 rex->getSourceRange(),
3794 if (getLangOptions().CPlusPlus) {
3795 // Pointee types must be the same: C++ [expr.add]
3796 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) {
3797 Diag(Loc, diag::err_typecheck_sub_ptr_compatible)
3798 << lex->getType() << rex->getType()
3799 << lex->getSourceRange() << rex->getSourceRange();
3803 // Pointee types must be compatible C99 6.5.6p3
3804 if (!Context.typesAreCompatible(
3805 Context.getCanonicalType(lpointee).getUnqualifiedType(),
3806 Context.getCanonicalType(rpointee).getUnqualifiedType())) {
3807 Diag(Loc, diag::err_typecheck_sub_ptr_compatible)
3808 << lex->getType() << rex->getType()
3809 << lex->getSourceRange() << rex->getSourceRange();
3814 if (ComplainAboutVoid)
3815 Diag(Loc, diag::ext_gnu_void_ptr)
3816 << lex->getSourceRange() << rex->getSourceRange();
3817 if (ComplainAboutFunc)
3818 Diag(Loc, diag::ext_gnu_ptr_func_arith)
3819 << ComplainAboutFunc->getType()
3820 << ComplainAboutFunc->getSourceRange();
3822 if (CompLHSTy) *CompLHSTy = lex->getType();
3823 return Context.getPointerDiffType();
3827 return InvalidOperands(Loc, lex, rex);
3831 QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc,
3832 bool isCompAssign) {
3833 // C99 6.5.7p2: Each of the operands shall have integer type.
3834 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType())
3835 return InvalidOperands(Loc, lex, rex);
3837 // Shifts don't perform usual arithmetic conversions, they just do integer
3838 // promotions on each operand. C99 6.5.7p3
3840 if (lex->getType()->isPromotableIntegerType())
3841 LHSTy = Context.IntTy;
3843 LHSTy = isPromotableBitField(lex, Context);
3845 LHSTy = lex->getType();
3848 ImpCastExprToType(lex, LHSTy);
3850 UsualUnaryConversions(rex);
3852 // "The type of the result is that of the promoted left operand."
3856 // C99 6.5.8, C++ [expr.rel]
3857 QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc,
3858 unsigned OpaqueOpc, bool isRelational) {
3859 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc;
3861 if (lex->getType()->isVectorType() || rex->getType()->isVectorType())
3862 return CheckVectorCompareOperands(lex, rex, Loc, isRelational);
3864 // C99 6.5.8p3 / C99 6.5.9p4
3865 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType())
3866 UsualArithmeticConversions(lex, rex);
3868 UsualUnaryConversions(lex);
3869 UsualUnaryConversions(rex);
3871 QualType lType = lex->getType();
3872 QualType rType = rex->getType();
3874 if (!lType->isFloatingType()
3875 && !(lType->isBlockPointerType() && isRelational)) {
3876 // For non-floating point types, check for self-comparisons of the form
3877 // x == x, x != x, x < x, etc. These always evaluate to a constant, and
3878 // often indicate logic errors in the program.
3879 // NOTE: Don't warn about comparisons of enum constants. These can arise
3880 // from macro expansions, and are usually quite deliberate.
3881 Expr *LHSStripped = lex->IgnoreParens();
3882 Expr *RHSStripped = rex->IgnoreParens();
3883 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped))
3884 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped))
3885 if (DRL->getDecl() == DRR->getDecl() &&
3886 !isa<EnumConstantDecl>(DRL->getDecl()))
3887 Diag(Loc, diag::warn_selfcomparison);
3889 if (isa<CastExpr>(LHSStripped))
3890 LHSStripped = LHSStripped->IgnoreParenCasts();
3891 if (isa<CastExpr>(RHSStripped))
3892 RHSStripped = RHSStripped->IgnoreParenCasts();
3894 // Warn about comparisons against a string constant (unless the other
3895 // operand is null), the user probably wants strcmp.
3896 Expr *literalString = 0;
3897 Expr *literalStringStripped = 0;
3898 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) &&
3899 !RHSStripped->isNullPointerConstant(Context)) {
3900 literalString = lex;
3901 literalStringStripped = LHSStripped;
3903 else if ((isa<StringLiteral>(RHSStripped) ||
3904 isa<ObjCEncodeExpr>(RHSStripped)) &&
3905 !LHSStripped->isNullPointerConstant(Context)) {
3906 literalString = rex;
3907 literalStringStripped = RHSStripped;
3910 if (literalString) {
3911 std::string resultComparison;
3913 case BinaryOperator::LT: resultComparison = ") < 0"; break;
3914 case BinaryOperator::GT: resultComparison = ") > 0"; break;
3915 case BinaryOperator::LE: resultComparison = ") <= 0"; break;
3916 case BinaryOperator::GE: resultComparison = ") >= 0"; break;
3917 case BinaryOperator::EQ: resultComparison = ") == 0"; break;
3918 case BinaryOperator::NE: resultComparison = ") != 0"; break;
3919 default: assert(false && "Invalid comparison operator");
3921 Diag(Loc, diag::warn_stringcompare)
3922 << isa<ObjCEncodeExpr>(literalStringStripped)
3923 << literalString->getSourceRange()
3924 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ")
3925 << CodeModificationHint::CreateInsertion(lex->getLocStart(),
3927 << CodeModificationHint::CreateInsertion(
3928 PP.getLocForEndOfToken(rex->getLocEnd()),
3933 // The result of comparisons is 'bool' in C++, 'int' in C.
3934 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy;
3937 if (lType->isRealType() && rType->isRealType())
3940 // Check for comparisons of floating point operands using != and ==.
3941 if (lType->isFloatingType()) {
3942 assert(rType->isFloatingType());
3943 CheckFloatComparison(Loc,lex,rex);
3946 if (lType->isArithmeticType() && rType->isArithmeticType())
3950 bool LHSIsNull = lex->isNullPointerConstant(Context);
3951 bool RHSIsNull = rex->isNullPointerConstant(Context);
3953 // All of the following pointer related warnings are GCC extensions, except
3954 // when handling null pointer constants. One day, we can consider making them
3955 // errors (when -pedantic-errors is enabled).
3956 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2
3957 QualType LCanPointeeTy =
3958 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType());
3959 QualType RCanPointeeTy =
3960 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType());
3962 // Simple check: if the pointee types are identical, we're done.
3963 if (LCanPointeeTy == RCanPointeeTy)
3966 if (getLangOptions().CPlusPlus) {
3967 // C++ [expr.rel]p2:
3968 // [...] Pointer conversions (4.10) and qualification
3969 // conversions (4.4) are performed on pointer operands (or on
3970 // a pointer operand and a null pointer constant) to bring
3971 // them to their composite pointer type. [...]
3973 // C++ [expr.eq]p2 uses the same notion for (in)equality
3974 // comparisons of pointers.
3975 QualType T = FindCompositePointerType(lex, rex);
3977 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers)
3978 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
3982 ImpCastExprToType(lex, T);
3983 ImpCastExprToType(rex, T);
3987 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2
3988 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() &&
3989 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(),
3990 RCanPointeeTy.getUnqualifiedType()) &&
3991 !Context.areComparableObjCPointerTypes(lType, rType)) {
3992 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers)
3993 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
3995 ImpCastExprToType(rex, lType); // promote the pointer to pointer
3998 // C++ allows comparison of pointers with null pointer constants.
3999 if (getLangOptions().CPlusPlus) {
4000 if (lType->isPointerType() && RHSIsNull) {
4001 ImpCastExprToType(rex, lType);
4004 if (rType->isPointerType() && LHSIsNull) {
4005 ImpCastExprToType(lex, rType);
4008 // And comparison of nullptr_t with itself.
4009 if (lType->isNullPtrType() && rType->isNullPtrType())
4012 // Handle block pointer types.
4013 if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) {
4014 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType();
4015 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType();
4017 if (!LHSIsNull && !RHSIsNull &&
4018 !Context.typesAreCompatible(lpointee, rpointee)) {
4019 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
4020 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
4022 ImpCastExprToType(rex, lType); // promote the pointer to pointer
4025 // Allow block pointers to be compared with null pointer constants.
4027 && ((lType->isBlockPointerType() && rType->isPointerType())
4028 || (lType->isPointerType() && rType->isBlockPointerType()))) {
4029 if (!LHSIsNull && !RHSIsNull) {
4030 if (!((rType->isPointerType() && rType->getAsPointerType()
4031 ->getPointeeType()->isVoidType())
4032 || (lType->isPointerType() && lType->getAsPointerType()
4033 ->getPointeeType()->isVoidType())))
4034 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
4035 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
4037 ImpCastExprToType(rex, lType); // promote the pointer to pointer
4041 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) {
4042 if (lType->isPointerType() || rType->isPointerType()) {
4043 const PointerType *LPT = lType->getAsPointerType();
4044 const PointerType *RPT = rType->getAsPointerType();
4045 bool LPtrToVoid = LPT ?
4046 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false;
4047 bool RPtrToVoid = RPT ?
4048 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false;
4050 if (!LPtrToVoid && !RPtrToVoid &&
4051 !Context.typesAreCompatible(lType, rType)) {
4052 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers)
4053 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
4054 ImpCastExprToType(rex, lType);
4057 ImpCastExprToType(rex, lType);
4060 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) {
4061 ImpCastExprToType(rex, lType);
4064 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) {
4065 Diag(Loc, diag::warn_incompatible_qualified_id_operands)
4066 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
4067 ImpCastExprToType(rex, lType);
4072 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) &&
4073 rType->isIntegerType()) {
4075 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer)
4076 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
4077 ImpCastExprToType(rex, lType); // promote the integer to pointer
4080 if (lType->isIntegerType() &&
4081 (rType->isPointerType() || rType->isObjCQualifiedIdType())) {
4083 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer)
4084 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
4085 ImpCastExprToType(lex, rType); // promote the integer to pointer
4088 // Handle block pointers.
4089 if (!isRelational && RHSIsNull
4090 && lType->isBlockPointerType() && rType->isIntegerType()) {
4091 ImpCastExprToType(rex, lType); // promote the integer to pointer
4094 if (!isRelational && LHSIsNull
4095 && lType->isIntegerType() && rType->isBlockPointerType()) {
4096 ImpCastExprToType(lex, rType); // promote the integer to pointer
4099 return InvalidOperands(Loc, lex, rex);
4102 /// CheckVectorCompareOperands - vector comparisons are a clang extension that
4103 /// operates on extended vector types. Instead of producing an IntTy result,
4104 /// like a scalar comparison, a vector comparison produces a vector of integer
4106 QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex,
4108 bool isRelational) {
4109 // Check to make sure we're operating on vectors of the same type and width,
4110 // Allowing one side to be a scalar of element type.
4111 QualType vType = CheckVectorOperands(Loc, lex, rex);
4115 QualType lType = lex->getType();
4116 QualType rType = rex->getType();
4118 // For non-floating point types, check for self-comparisons of the form
4119 // x == x, x != x, x < x, etc. These always evaluate to a constant, and
4120 // often indicate logic errors in the program.
4121 if (!lType->isFloatingType()) {
4122 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens()))
4123 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens()))
4124 if (DRL->getDecl() == DRR->getDecl())
4125 Diag(Loc, diag::warn_selfcomparison);
4128 // Check for comparisons of floating point operands using != and ==.
4129 if (!isRelational && lType->isFloatingType()) {
4130 assert (rType->isFloatingType());
4131 CheckFloatComparison(Loc,lex,rex);
4134 // FIXME: Vector compare support in the LLVM backend is not fully reliable,
4135 // just reject all vector comparisons for now.
4137 Diag(Loc, diag::err_typecheck_vector_comparison)
4138 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
4142 // Return the type for the comparison, which is the same as vector type for
4143 // integer vectors, or an integer type of identical size and number of
4144 // elements for floating point vectors.
4145 if (lType->isIntegerType())
4148 const VectorType *VTy = lType->getAsVectorType();
4149 unsigned TypeSize = Context.getTypeSize(VTy->getElementType());
4150 if (TypeSize == Context.getTypeSize(Context.IntTy))
4151 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements());
4152 if (TypeSize == Context.getTypeSize(Context.LongTy))
4153 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements());
4155 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) &&
4156 "Unhandled vector element size in vector compare");
4157 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements());
4160 inline QualType Sema::CheckBitwiseOperands(
4161 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign)
4163 if (lex->getType()->isVectorType() || rex->getType()->isVectorType())
4164 return CheckVectorOperands(Loc, lex, rex);
4166 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign);
4168 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType())
4170 return InvalidOperands(Loc, lex, rex);
4173 inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14]
4174 Expr *&lex, Expr *&rex, SourceLocation Loc)
4176 UsualUnaryConversions(lex);
4177 UsualUnaryConversions(rex);
4179 if (lex->getType()->isScalarType() && rex->getType()->isScalarType())
4180 return Context.IntTy;
4181 return InvalidOperands(Loc, lex, rex);
4184 /// IsReadonlyProperty - Verify that otherwise a valid l-value expression
4185 /// is a read-only property; return true if so. A readonly property expression
4186 /// depends on various declarations and thus must be treated specially.
4188 static bool IsReadonlyProperty(Expr *E, Sema &S)
4190 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) {
4191 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E);
4192 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) {
4193 QualType BaseType = PropExpr->getBase()->getType();
4194 if (const PointerType *PTy = BaseType->getAsPointerType())
4195 if (const ObjCInterfaceType *IFTy =
4196 PTy->getPointeeType()->getAsObjCInterfaceType())
4197 if (ObjCInterfaceDecl *IFace = IFTy->getDecl())
4198 if (S.isPropertyReadonly(PDecl, IFace))
4205 /// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not,
4206 /// emit an error and return true. If so, return false.
4207 static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) {
4208 SourceLocation OrigLoc = Loc;
4209 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context,
4211 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S))
4212 IsLV = Expr::MLV_ReadonlyProperty;
4213 if (IsLV == Expr::MLV_Valid)
4217 bool NeedType = false;
4218 switch (IsLV) { // C99 6.5.16p2
4219 default: assert(0 && "Unknown result from isModifiableLvalue!");
4220 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break;
4221 case Expr::MLV_ArrayType:
4222 Diag = diag::err_typecheck_array_not_modifiable_lvalue;
4225 case Expr::MLV_NotObjectType:
4226 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue;
4229 case Expr::MLV_LValueCast:
4230 Diag = diag::err_typecheck_lvalue_casts_not_supported;
4232 case Expr::MLV_InvalidExpression:
4233 Diag = diag::err_typecheck_expression_not_modifiable_lvalue;
4235 case Expr::MLV_IncompleteType:
4236 case Expr::MLV_IncompleteVoidType:
4237 return S.RequireCompleteType(Loc, E->getType(),
4238 diag::err_typecheck_incomplete_type_not_modifiable_lvalue,
4239 E->getSourceRange());
4240 case Expr::MLV_DuplicateVectorComponents:
4241 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue;
4243 case Expr::MLV_NotBlockQualified:
4244 Diag = diag::err_block_decl_ref_not_modifiable_lvalue;
4246 case Expr::MLV_ReadonlyProperty:
4247 Diag = diag::error_readonly_property_assignment;
4249 case Expr::MLV_NoSetterProperty:
4250 Diag = diag::error_nosetter_property_assignment;
4256 Assign = SourceRange(OrigLoc, OrigLoc);
4258 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign;
4260 S.Diag(Loc, Diag) << E->getSourceRange() << Assign;
4267 QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS,
4269 QualType CompoundType) {
4270 // Verify that LHS is a modifiable lvalue, and emit error if not.
4271 if (CheckForModifiableLvalue(LHS, Loc, *this))
4274 QualType LHSType = LHS->getType();
4275 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType;
4277 AssignConvertType ConvTy;
4278 if (CompoundType.isNull()) {
4279 // Simple assignment "x = y".
4280 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS);
4281 // Special case of NSObject attributes on c-style pointer types.
4282 if (ConvTy == IncompatiblePointer &&
4283 ((Context.isObjCNSObjectType(LHSType) &&
4284 Context.isObjCObjectPointerType(RHSType)) ||
4285 (Context.isObjCNSObjectType(RHSType) &&
4286 Context.isObjCObjectPointerType(LHSType))))
4287 ConvTy = Compatible;
4289 // If the RHS is a unary plus or minus, check to see if they = and + are
4290 // right next to each other. If so, the user may have typo'd "x =+ 4"
4291 // instead of "x += 4".
4292 Expr *RHSCheck = RHS;
4293 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck))
4294 RHSCheck = ICE->getSubExpr();
4295 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) {
4296 if ((UO->getOpcode() == UnaryOperator::Plus ||
4297 UO->getOpcode() == UnaryOperator::Minus) &&
4298 Loc.isFileID() && UO->getOperatorLoc().isFileID() &&
4299 // Only if the two operators are exactly adjacent.
4300 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() &&
4301 // And there is a space or other character before the subexpr of the
4302 // unary +/-. We don't want to warn on "x=-1".
4303 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() &&
4304 UO->getSubExpr()->getLocStart().isFileID()) {
4305 Diag(Loc, diag::warn_not_compound_assign)
4306 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-")
4307 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc());
4311 // Compound assignment "x += y"
4312 ConvTy = CheckAssignmentConstraints(LHSType, RHSType);
4315 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType,
4319 // C99 6.5.16p3: The type of an assignment expression is the type of the
4320 // left operand unless the left operand has qualified type, in which case
4321 // it is the unqualified version of the type of the left operand.
4322 // C99 6.5.16.1p2: In simple assignment, the value of the right operand
4323 // is converted to the type of the assignment expression (above).
4324 // C++ 5.17p1: the type of the assignment expression is that of its left
4326 return LHSType.getUnqualifiedType();
4330 QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) {
4331 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions.
4332 DefaultFunctionArrayConversion(RHS);
4334 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be
4335 // incomplete in C++).
4337 return RHS->getType();
4340 /// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine
4341 /// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions.
4342 QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc,
4344 if (Op->isTypeDependent())
4345 return Context.DependentTy;
4347 QualType ResType = Op->getType();
4348 assert(!ResType.isNull() && "no type for increment/decrement expression");
4350 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) {
4351 // Decrement of bool is not allowed.
4353 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange();
4356 // Increment of bool sets it to true, but is deprecated.
4357 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange();
4358 } else if (ResType->isRealType()) {
4360 } else if (const PointerType *PT = ResType->getAsPointerType()) {
4361 // C99 6.5.2.4p2, 6.5.6p2
4362 if (PT->getPointeeType()->isVoidType()) {
4363 if (getLangOptions().CPlusPlus) {
4364 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type)
4365 << Op->getSourceRange();
4369 // Pointer to void is a GNU extension in C.
4370 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange();
4371 } else if (PT->getPointeeType()->isFunctionType()) {
4372 if (getLangOptions().CPlusPlus) {
4373 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type)
4374 << Op->getType() << Op->getSourceRange();
4378 Diag(OpLoc, diag::ext_gnu_ptr_func_arith)
4379 << ResType << Op->getSourceRange();
4380 } else if (RequireCompleteType(OpLoc, PT->getPointeeType(),
4381 diag::err_typecheck_arithmetic_incomplete_type,
4382 Op->getSourceRange(), SourceRange(),
4385 } else if (ResType->isComplexType()) {
4386 // C99 does not support ++/-- on complex types, we allow as an extension.
4387 Diag(OpLoc, diag::ext_integer_increment_complex)
4388 << ResType << Op->getSourceRange();
4390 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement)
4391 << ResType << Op->getSourceRange();
4394 // At this point, we know we have a real, complex or pointer type.
4395 // Now make sure the operand is a modifiable lvalue.
4396 if (CheckForModifiableLvalue(Op, OpLoc, *this))
4401 /// getPrimaryDecl - Helper function for CheckAddressOfOperand().
4402 /// This routine allows us to typecheck complex/recursive expressions
4403 /// where the declaration is needed for type checking. We only need to
4404 /// handle cases when the expression references a function designator
4405 /// or is an lvalue. Here are some examples:
4407 /// - &*****f => f for f a function designator.
4409 /// - &s.zz[1].yy -> s, if zz is an array
4410 /// - *(x + 1) -> x, if x is an array
4411 /// - &"123"[2] -> 0
4412 /// - & __real__ x -> x
4413 static NamedDecl *getPrimaryDecl(Expr *E) {
4414 switch (E->getStmtClass()) {
4415 case Stmt::DeclRefExprClass:
4416 case Stmt::QualifiedDeclRefExprClass:
4417 return cast<DeclRefExpr>(E)->getDecl();
4418 case Stmt::MemberExprClass:
4419 // If this is an arrow operator, the address is an offset from
4420 // the base's value, so the object the base refers to is
4422 if (cast<MemberExpr>(E)->isArrow())
4424 // Otherwise, the expression refers to a part of the base
4425 return getPrimaryDecl(cast<MemberExpr>(E)->getBase());
4426 case Stmt::ArraySubscriptExprClass: {
4427 // FIXME: This code shouldn't be necessary! We should catch the implicit
4428 // promotion of register arrays earlier.
4429 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase();
4430 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) {
4431 if (ICE->getSubExpr()->getType()->isArrayType())
4432 return getPrimaryDecl(ICE->getSubExpr());
4436 case Stmt::UnaryOperatorClass: {
4437 UnaryOperator *UO = cast<UnaryOperator>(E);
4439 switch(UO->getOpcode()) {
4440 case UnaryOperator::Real:
4441 case UnaryOperator::Imag:
4442 case UnaryOperator::Extension:
4443 return getPrimaryDecl(UO->getSubExpr());
4448 case Stmt::ParenExprClass:
4449 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr());
4450 case Stmt::ImplicitCastExprClass:
4451 // If the result of an implicit cast is an l-value, we care about
4452 // the sub-expression; otherwise, the result here doesn't matter.
4453 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr());
4459 /// CheckAddressOfOperand - The operand of & must be either a function
4460 /// designator or an lvalue designating an object. If it is an lvalue, the
4461 /// object cannot be declared with storage class register or be a bit field.
4462 /// Note: The usual conversions are *not* applied to the operand of the &
4463 /// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue.
4464 /// In C++, the operand might be an overloaded function name, in which case
4465 /// we allow the '&' but retain the overloaded-function type.
4466 QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) {
4467 // Make sure to ignore parentheses in subsequent checks
4468 op = op->IgnoreParens();
4470 if (op->isTypeDependent())
4471 return Context.DependentTy;
4473 if (getLangOptions().C99) {
4474 // Implement C99-only parts of addressof rules.
4475 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) {
4476 if (uOp->getOpcode() == UnaryOperator::Deref)
4477 // Per C99 6.5.3.2, the address of a deref always returns a valid result
4478 // (assuming the deref expression is valid).
4479 return uOp->getSubExpr()->getType();
4481 // Technically, there should be a check for array subscript
4482 // expressions here, but the result of one is always an lvalue anyway.
4484 NamedDecl *dcl = getPrimaryDecl(op);
4485 Expr::isLvalueResult lval = op->isLvalue(Context);
4487 if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) {
4489 // The operand must be either an l-value or a function designator
4490 if (!op->getType()->isFunctionType()) {
4491 // FIXME: emit more specific diag...
4492 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof)
4493 << op->getSourceRange();
4496 } else if (op->getBitField()) { // C99 6.5.3.2p1
4497 // The operand cannot be a bit-field
4498 Diag(OpLoc, diag::err_typecheck_address_of)
4499 << "bit-field" << op->getSourceRange();
4501 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) &&
4502 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){
4503 // The operand cannot be an element of a vector
4504 Diag(OpLoc, diag::err_typecheck_address_of)
4505 << "vector element" << op->getSourceRange();
4507 } else if (dcl) { // C99 6.5.3.2p1
4508 // We have an lvalue with a decl. Make sure the decl is not declared
4509 // with the register storage-class specifier.
4510 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) {
4511 if (vd->getStorageClass() == VarDecl::Register) {
4512 Diag(OpLoc, diag::err_typecheck_address_of)
4513 << "register variable" << op->getSourceRange();
4516 } else if (isa<OverloadedFunctionDecl>(dcl)) {
4517 return Context.OverloadTy;
4518 } else if (isa<FieldDecl>(dcl)) {
4519 // Okay: we can take the address of a field.
4520 // Could be a pointer to member, though, if there is an explicit
4521 // scope qualifier for the class.
4522 if (isa<QualifiedDeclRefExpr>(op)) {
4523 DeclContext *Ctx = dcl->getDeclContext();
4524 if (Ctx && Ctx->isRecord())
4525 return Context.getMemberPointerType(op->getType(),
4526 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr());
4528 } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(dcl)) {
4529 // Okay: we can take the address of a function.
4531 if (isa<QualifiedDeclRefExpr>(op) && MD->isInstance())
4532 return Context.getMemberPointerType(op->getType(),
4533 Context.getTypeDeclType(MD->getParent()).getTypePtr());
4534 } else if (!isa<FunctionDecl>(dcl))
4535 assert(0 && "Unknown/unexpected decl type");
4538 if (lval == Expr::LV_IncompleteVoidType) {
4539 // Taking the address of a void variable is technically illegal, but we
4540 // allow it in cases which are otherwise valid.
4541 // Example: "extern void x; void* y = &x;".
4542 Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange();
4545 // If the operand has type "type", the result has type "pointer to type".
4546 return Context.getPointerType(op->getType());
4549 QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) {
4550 if (Op->isTypeDependent())
4551 return Context.DependentTy;
4553 UsualUnaryConversions(Op);
4554 QualType Ty = Op->getType();
4556 // Note that per both C89 and C99, this is always legal, even if ptype is an
4557 // incomplete type or void. It would be possible to warn about dereferencing
4558 // a void pointer, but it's completely well-defined, and such a warning is
4559 // unlikely to catch any mistakes.
4560 if (const PointerType *PT = Ty->getAsPointerType())
4561 return PT->getPointeeType();
4563 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer)
4564 << Ty << Op->getSourceRange();
4568 static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode(
4569 tok::TokenKind Kind) {
4570 BinaryOperator::Opcode Opc;
4572 default: assert(0 && "Unknown binop!");
4573 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break;
4574 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break;
4575 case tok::star: Opc = BinaryOperator::Mul; break;
4576 case tok::slash: Opc = BinaryOperator::Div; break;
4577 case tok::percent: Opc = BinaryOperator::Rem; break;
4578 case tok::plus: Opc = BinaryOperator::Add; break;
4579 case tok::minus: Opc = BinaryOperator::Sub; break;
4580 case tok::lessless: Opc = BinaryOperator::Shl; break;
4581 case tok::greatergreater: Opc = BinaryOperator::Shr; break;
4582 case tok::lessequal: Opc = BinaryOperator::LE; break;
4583 case tok::less: Opc = BinaryOperator::LT; break;
4584 case tok::greaterequal: Opc = BinaryOperator::GE; break;
4585 case tok::greater: Opc = BinaryOperator::GT; break;
4586 case tok::exclaimequal: Opc = BinaryOperator::NE; break;
4587 case tok::equalequal: Opc = BinaryOperator::EQ; break;
4588 case tok::amp: Opc = BinaryOperator::And; break;
4589 case tok::caret: Opc = BinaryOperator::Xor; break;
4590 case tok::pipe: Opc = BinaryOperator::Or; break;
4591 case tok::ampamp: Opc = BinaryOperator::LAnd; break;
4592 case tok::pipepipe: Opc = BinaryOperator::LOr; break;
4593 case tok::equal: Opc = BinaryOperator::Assign; break;
4594 case tok::starequal: Opc = BinaryOperator::MulAssign; break;
4595 case tok::slashequal: Opc = BinaryOperator::DivAssign; break;
4596 case tok::percentequal: Opc = BinaryOperator::RemAssign; break;
4597 case tok::plusequal: Opc = BinaryOperator::AddAssign; break;
4598 case tok::minusequal: Opc = BinaryOperator::SubAssign; break;
4599 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break;
4600 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break;
4601 case tok::ampequal: Opc = BinaryOperator::AndAssign; break;
4602 case tok::caretequal: Opc = BinaryOperator::XorAssign; break;
4603 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break;
4604 case tok::comma: Opc = BinaryOperator::Comma; break;
4609 static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode(
4610 tok::TokenKind Kind) {
4611 UnaryOperator::Opcode Opc;
4613 default: assert(0 && "Unknown unary op!");
4614 case tok::plusplus: Opc = UnaryOperator::PreInc; break;
4615 case tok::minusminus: Opc = UnaryOperator::PreDec; break;
4616 case tok::amp: Opc = UnaryOperator::AddrOf; break;
4617 case tok::star: Opc = UnaryOperator::Deref; break;
4618 case tok::plus: Opc = UnaryOperator::Plus; break;
4619 case tok::minus: Opc = UnaryOperator::Minus; break;
4620 case tok::tilde: Opc = UnaryOperator::Not; break;
4621 case tok::exclaim: Opc = UnaryOperator::LNot; break;
4622 case tok::kw___real: Opc = UnaryOperator::Real; break;
4623 case tok::kw___imag: Opc = UnaryOperator::Imag; break;
4624 case tok::kw___extension__: Opc = UnaryOperator::Extension; break;
4629 /// CreateBuiltinBinOp - Creates a new built-in binary operation with
4630 /// operator @p Opc at location @c TokLoc. This routine only supports
4631 /// built-in operations; ActOnBinOp handles overloaded operators.
4632 Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc,
4634 Expr *lhs, Expr *rhs) {
4635 QualType ResultTy; // Result type of the binary operator.
4636 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op;
4637 // The following two variables are used for compound assignment operators
4638 QualType CompLHSTy; // Type of LHS after promotions for computation
4639 QualType CompResultTy; // Type of computation result
4642 case BinaryOperator::Assign:
4643 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType());
4645 case BinaryOperator::PtrMemD:
4646 case BinaryOperator::PtrMemI:
4647 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc,
4648 Opc == BinaryOperator::PtrMemI);
4650 case BinaryOperator::Mul:
4651 case BinaryOperator::Div:
4652 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc);
4654 case BinaryOperator::Rem:
4655 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc);
4657 case BinaryOperator::Add:
4658 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc);
4660 case BinaryOperator::Sub:
4661 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc);
4663 case BinaryOperator::Shl:
4664 case BinaryOperator::Shr:
4665 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc);
4667 case BinaryOperator::LE:
4668 case BinaryOperator::LT:
4669 case BinaryOperator::GE:
4670 case BinaryOperator::GT:
4671 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true);
4673 case BinaryOperator::EQ:
4674 case BinaryOperator::NE:
4675 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false);
4677 case BinaryOperator::And:
4678 case BinaryOperator::Xor:
4679 case BinaryOperator::Or:
4680 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc);
4682 case BinaryOperator::LAnd:
4683 case BinaryOperator::LOr:
4684 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc);
4686 case BinaryOperator::MulAssign:
4687 case BinaryOperator::DivAssign:
4688 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true);
4689 CompLHSTy = CompResultTy;
4690 if (!CompResultTy.isNull())
4691 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy);
4693 case BinaryOperator::RemAssign:
4694 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true);
4695 CompLHSTy = CompResultTy;
4696 if (!CompResultTy.isNull())
4697 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy);
4699 case BinaryOperator::AddAssign:
4700 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy);
4701 if (!CompResultTy.isNull())
4702 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy);
4704 case BinaryOperator::SubAssign:
4705 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy);
4706 if (!CompResultTy.isNull())
4707 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy);
4709 case BinaryOperator::ShlAssign:
4710 case BinaryOperator::ShrAssign:
4711 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true);
4712 CompLHSTy = CompResultTy;
4713 if (!CompResultTy.isNull())
4714 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy);
4716 case BinaryOperator::AndAssign:
4717 case BinaryOperator::XorAssign:
4718 case BinaryOperator::OrAssign:
4719 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true);
4720 CompLHSTy = CompResultTy;
4721 if (!CompResultTy.isNull())
4722 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy);
4724 case BinaryOperator::Comma:
4725 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc);
4728 if (ResultTy.isNull())
4730 if (CompResultTy.isNull())
4731 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc));
4733 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy,
4734 CompLHSTy, CompResultTy,
4738 // Binary Operators. 'Tok' is the token for the operator.
4739 Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc,
4740 tok::TokenKind Kind,
4741 ExprArg LHS, ExprArg RHS) {
4742 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind);
4743 Expr *lhs = LHS.takeAs<Expr>(), *rhs = RHS.takeAs<Expr>();
4745 assert((lhs != 0) && "ActOnBinOp(): missing left expression");
4746 assert((rhs != 0) && "ActOnBinOp(): missing right expression");
4748 if (getLangOptions().CPlusPlus &&
4749 (lhs->getType()->isOverloadableType() ||
4750 rhs->getType()->isOverloadableType())) {
4751 // Find all of the overloaded operators visible from this
4752 // point. We perform both an operator-name lookup from the local
4753 // scope and an argument-dependent lookup based on the types of
4755 FunctionSet Functions;
4756 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc);
4757 if (OverOp != OO_None) {
4758 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(),
4760 Expr *Args[2] = { lhs, rhs };
4761 DeclarationName OpName
4762 = Context.DeclarationNames.getCXXOperatorName(OverOp);
4763 ArgumentDependentLookup(OpName, Args, 2, Functions);
4766 // Build the (potentially-overloaded, potentially-dependent)
4767 // binary operation.
4768 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs);
4771 // Build a built-in binary operation.
4772 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs);
4775 Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc,
4778 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn);
4780 // FIXME: Input is modified below, but InputArg is not updated appropriately.
4781 Expr *Input = (Expr *)InputArg.get();
4782 QualType resultType;
4784 case UnaryOperator::PostInc:
4785 case UnaryOperator::PostDec:
4786 case UnaryOperator::OffsetOf:
4787 assert(false && "Invalid unary operator");
4790 case UnaryOperator::PreInc:
4791 case UnaryOperator::PreDec:
4792 resultType = CheckIncrementDecrementOperand(Input, OpLoc,
4793 Opc == UnaryOperator::PreInc);
4795 case UnaryOperator::AddrOf:
4796 resultType = CheckAddressOfOperand(Input, OpLoc);
4798 case UnaryOperator::Deref:
4799 DefaultFunctionArrayConversion(Input);
4800 resultType = CheckIndirectionOperand(Input, OpLoc);
4802 case UnaryOperator::Plus:
4803 case UnaryOperator::Minus:
4804 UsualUnaryConversions(Input);
4805 resultType = Input->getType();
4806 if (resultType->isDependentType())
4808 if (resultType->isArithmeticType()) // C99 6.5.3.3p1
4810 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7
4811 resultType->isEnumeralType())
4813 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6
4814 Opc == UnaryOperator::Plus &&
4815 resultType->isPointerType())
4818 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
4819 << resultType << Input->getSourceRange());
4820 case UnaryOperator::Not: // bitwise complement
4821 UsualUnaryConversions(Input);
4822 resultType = Input->getType();
4823 if (resultType->isDependentType())
4825 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension.
4826 if (resultType->isComplexType() || resultType->isComplexIntegerType())
4827 // C99 does not support '~' for complex conjugation.
4828 Diag(OpLoc, diag::ext_integer_complement_complex)
4829 << resultType << Input->getSourceRange();
4830 else if (!resultType->isIntegerType())
4831 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
4832 << resultType << Input->getSourceRange());
4834 case UnaryOperator::LNot: // logical negation
4835 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5).
4836 DefaultFunctionArrayConversion(Input);
4837 resultType = Input->getType();
4838 if (resultType->isDependentType())
4840 if (!resultType->isScalarType()) // C99 6.5.3.3p1
4841 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
4842 << resultType << Input->getSourceRange());
4843 // LNot always has type int. C99 6.5.3.3p5.
4844 // In C++, it's bool. C++ 5.3.1p8
4845 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy;
4847 case UnaryOperator::Real:
4848 case UnaryOperator::Imag:
4849 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real);
4851 case UnaryOperator::Extension:
4852 resultType = Input->getType();
4855 if (resultType.isNull())
4859 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc));
4862 // Unary Operators. 'Tok' is the token for the operator.
4863 Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc,
4864 tok::TokenKind Op, ExprArg input) {
4865 Expr *Input = (Expr*)input.get();
4866 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op);
4868 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) {
4869 // Find all of the overloaded operators visible from this
4870 // point. We perform both an operator-name lookup from the local
4871 // scope and an argument-dependent lookup based on the types of
4873 FunctionSet Functions;
4874 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc);
4875 if (OverOp != OO_None) {
4876 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(),
4878 DeclarationName OpName
4879 = Context.DeclarationNames.getCXXOperatorName(OverOp);
4880 ArgumentDependentLookup(OpName, &Input, 1, Functions);
4883 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input));
4886 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input));
4889 /// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo".
4890 Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc,
4891 SourceLocation LabLoc,
4892 IdentifierInfo *LabelII) {
4893 // Look up the record for this label identifier.
4894 LabelStmt *&LabelDecl = getLabelMap()[LabelII];
4896 // If we haven't seen this label yet, create a forward reference. It
4897 // will be validated and/or cleaned up in ActOnFinishFunctionBody.
4899 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0);
4901 // Create the AST node. The address of a label always has type 'void*'.
4902 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl,
4903 Context.getPointerType(Context.VoidTy)));
4906 Sema::OwningExprResult
4907 Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt,
4908 SourceLocation RPLoc) { // "({..})"
4909 Stmt *SubStmt = static_cast<Stmt*>(substmt.get());
4910 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!");
4911 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt);
4913 bool isFileScope = getCurFunctionOrMethodDecl() == 0;
4915 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope));
4917 // FIXME: there are a variety of strange constraints to enforce here, for
4918 // example, it is not possible to goto into a stmt expression apparently.
4919 // More semantic analysis is needed.
4921 // If there are sub stmts in the compound stmt, take the type of the last one
4922 // as the type of the stmtexpr.
4923 QualType Ty = Context.VoidTy;
4925 if (!Compound->body_empty()) {
4926 Stmt *LastStmt = Compound->body_back();
4927 // If LastStmt is a label, skip down through into the body.
4928 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt))
4929 LastStmt = Label->getSubStmt();
4931 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt))
4932 Ty = LastExpr->getType();
4935 // FIXME: Check that expression type is complete/non-abstract; statement
4936 // expressions are not lvalues.
4939 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc));
4942 Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S,
4943 SourceLocation BuiltinLoc,
4944 SourceLocation TypeLoc,
4946 OffsetOfComponent *CompPtr,
4947 unsigned NumComponents,
4948 SourceLocation RPLoc) {
4949 // FIXME: This function leaks all expressions in the offset components on
4951 QualType ArgTy = QualType::getFromOpaquePtr(argty);
4952 assert(!ArgTy.isNull() && "Missing type argument!");
4954 bool Dependent = ArgTy->isDependentType();
4956 // We must have at least one component that refers to the type, and the first
4957 // one is known to be a field designator. Verify that the ArgTy represents
4958 // a struct/union/class.
4959 if (!Dependent && !ArgTy->isRecordType())
4960 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy);
4962 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable
4963 // with an incomplete type would be illegal.
4965 // Otherwise, create a null pointer as the base, and iteratively process
4966 // the offsetof designators.
4967 QualType ArgTyPtr = Context.getPointerType(ArgTy);
4968 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr);
4969 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref,
4970 ArgTy, SourceLocation());
4972 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a
4973 // GCC extension, diagnose them.
4974 // FIXME: This diagnostic isn't actually visible because the location is in
4976 if (NumComponents != 1)
4977 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator)
4978 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd);
4981 bool DidWarnAboutNonPOD = false;
4983 // FIXME: Dependent case loses a lot of information here. And probably
4984 // leaks like a sieve.
4985 for (unsigned i = 0; i != NumComponents; ++i) {
4986 const OffsetOfComponent &OC = CompPtr[i];
4987 if (OC.isBrackets) {
4988 // Offset of an array sub-field. TODO: Should we allow vector elements?
4989 const ArrayType *AT = Context.getAsArrayType(Res->getType());
4991 Res->Destroy(Context);
4992 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type)
4996 // FIXME: C++: Verify that operator[] isn't overloaded.
4998 // Promote the array so it looks more like a normal array subscript
5000 DefaultFunctionArrayConversion(Res);
5003 Expr *Idx = static_cast<Expr*>(OC.U.E);
5005 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType())
5006 return ExprError(Diag(Idx->getLocStart(),
5007 diag::err_typecheck_subscript_not_integer)
5008 << Idx->getSourceRange());
5010 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(),
5015 const RecordType *RC = Res->getType()->getAsRecordType();
5017 Res->Destroy(Context);
5018 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type)
5022 // Get the decl corresponding to this.
5023 RecordDecl *RD = RC->getDecl();
5024 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
5025 if (!CRD->isPOD() && !DidWarnAboutNonPOD) {
5026 ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type)
5027 << SourceRange(CompPtr[0].LocStart, OC.LocEnd)
5029 DidWarnAboutNonPOD = true;
5033 FieldDecl *MemberDecl
5034 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo,
5039 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member)
5040 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd));
5042 // FIXME: C++: Verify that MemberDecl isn't a static field.
5043 // FIXME: Verify that MemberDecl isn't a bitfield.
5044 if (cast<RecordDecl>(MemberDecl->getDeclContext())->isAnonymousStructOrUnion()) {
5045 Res = BuildAnonymousStructUnionMemberReference(
5046 SourceLocation(), MemberDecl, Res, SourceLocation()).takeAs<Expr>();
5048 // MemberDecl->getType() doesn't get the right qualifiers, but it
5049 // doesn't matter here.
5050 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd,
5051 MemberDecl->getType().getNonReferenceType());
5056 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf,
5057 Context.getSizeType(), BuiltinLoc));
5061 Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc,
5062 TypeTy *arg1,TypeTy *arg2,
5063 SourceLocation RPLoc) {
5064 QualType argT1 = QualType::getFromOpaquePtr(arg1);
5065 QualType argT2 = QualType::getFromOpaquePtr(arg2);
5067 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)");
5069 if (getLangOptions().CPlusPlus) {
5070 Diag(BuiltinLoc, diag::err_types_compatible_p_in_cplusplus)
5071 << SourceRange(BuiltinLoc, RPLoc);
5075 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc,
5076 argT1, argT2, RPLoc));
5079 Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc,
5081 ExprArg expr1, ExprArg expr2,
5082 SourceLocation RPLoc) {
5083 Expr *CondExpr = static_cast<Expr*>(cond.get());
5084 Expr *LHSExpr = static_cast<Expr*>(expr1.get());
5085 Expr *RHSExpr = static_cast<Expr*>(expr2.get());
5087 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)");
5090 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) {
5091 resType = Context.DependentTy;
5093 // The conditional expression is required to be a constant expression.
5094 llvm::APSInt condEval(32);
5095 SourceLocation ExpLoc;
5096 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc))
5097 return ExprError(Diag(ExpLoc,
5098 diag::err_typecheck_choose_expr_requires_constant)
5099 << CondExpr->getSourceRange());
5101 // If the condition is > zero, then the AST type is the same as the LSHExpr.
5102 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType();
5105 cond.release(); expr1.release(); expr2.release();
5106 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr,
5110 //===----------------------------------------------------------------------===//
5111 // Clang Extensions.
5112 //===----------------------------------------------------------------------===//
5114 /// ActOnBlockStart - This callback is invoked when a block literal is started.
5115 void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) {
5116 // Analyze block parameters.
5117 BlockSemaInfo *BSI = new BlockSemaInfo();
5119 // Add BSI to CurBlock.
5120 BSI->PrevBlockInfo = CurBlock;
5123 BSI->ReturnType = QualType();
5124 BSI->TheScope = BlockScope;
5125 BSI->hasBlockDeclRefExprs = false;
5126 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking;
5127 CurFunctionNeedsScopeChecking = false;
5129 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc);
5130 PushDeclContext(BlockScope, BSI->TheDecl);
5133 void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) {
5134 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!");
5136 if (ParamInfo.getNumTypeObjects() == 0
5137 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) {
5138 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo);
5139 QualType T = GetTypeForDeclarator(ParamInfo, CurScope);
5141 if (T->isArrayType()) {
5142 Diag(ParamInfo.getSourceRange().getBegin(),
5143 diag::err_block_returns_array);
5147 // The parameter list is optional, if there was none, assume ().
5148 if (!T->isFunctionType())
5149 T = Context.getFunctionType(T, NULL, 0, 0, 0);
5151 CurBlock->hasPrototype = true;
5152 CurBlock->isVariadic = false;
5153 // Check for a valid sentinel attribute on this block.
5154 if (CurBlock->TheDecl->getAttr<SentinelAttr>(Context)) {
5155 Diag(ParamInfo.getAttributes()->getLoc(),
5156 diag::warn_attribute_sentinel_not_variadic) << 1;
5157 // FIXME: remove the attribute.
5159 QualType RetTy = T.getTypePtr()->getAsFunctionType()->getResultType();
5161 // Do not allow returning a objc interface by-value.
5162 if (RetTy->isObjCInterfaceType()) {
5163 Diag(ParamInfo.getSourceRange().getBegin(),
5164 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy;
5170 // Analyze arguments to block.
5171 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function &&
5172 "Not a function declarator!");
5173 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun;
5175 CurBlock->hasPrototype = FTI.hasPrototype;
5176 CurBlock->isVariadic = true;
5178 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes
5179 // no arguments, not a function that takes a single void argument.
5180 if (FTI.hasPrototype &&
5181 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
5182 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&&
5183 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) {
5184 // empty arg list, don't push any params.
5185 CurBlock->isVariadic = false;
5186 } else if (FTI.hasPrototype) {
5187 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i)
5188 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>());
5189 CurBlock->isVariadic = FTI.isVariadic;
5191 CurBlock->TheDecl->setParams(Context, CurBlock->Params.data(),
5192 CurBlock->Params.size());
5193 CurBlock->TheDecl->setIsVariadic(CurBlock->isVariadic);
5194 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo);
5195 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(),
5196 E = CurBlock->TheDecl->param_end(); AI != E; ++AI)
5197 // If this has an identifier, add it to the scope stack.
5198 if ((*AI)->getIdentifier())
5199 PushOnScopeChains(*AI, CurBlock->TheScope);
5201 // Check for a valid sentinel attribute on this block.
5202 if (!CurBlock->isVariadic &&
5203 CurBlock->TheDecl->getAttr<SentinelAttr>(Context)) {
5204 Diag(ParamInfo.getAttributes()->getLoc(),
5205 diag::warn_attribute_sentinel_not_variadic) << 1;
5206 // FIXME: remove the attribute.
5209 // Analyze the return type.
5210 QualType T = GetTypeForDeclarator(ParamInfo, CurScope);
5211 QualType RetTy = T->getAsFunctionType()->getResultType();
5213 // Do not allow returning a objc interface by-value.
5214 if (RetTy->isObjCInterfaceType()) {
5215 Diag(ParamInfo.getSourceRange().getBegin(),
5216 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy;
5217 } else if (!RetTy->isDependentType())
5218 CurBlock->ReturnType = RetTy;
5221 /// ActOnBlockError - If there is an error parsing a block, this callback
5222 /// is invoked to pop the information about the block from the action impl.
5223 void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) {
5224 // Ensure that CurBlock is deleted.
5225 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock);
5227 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking;
5229 // Pop off CurBlock, handle nested blocks.
5231 CurBlock = CurBlock->PrevBlockInfo;
5232 // FIXME: Delete the ParmVarDecl objects as well???
5235 /// ActOnBlockStmtExpr - This is called when the body of a block statement
5236 /// literal was successfully completed. ^(int x){...}
5237 Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc,
5238 StmtArg body, Scope *CurScope) {
5239 // If blocks are disabled, emit an error.
5240 if (!LangOpts.Blocks)
5241 Diag(CaretLoc, diag::err_blocks_disable);
5243 // Ensure that CurBlock is deleted.
5244 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock);
5248 // Pop off CurBlock, handle nested blocks.
5249 CurBlock = CurBlock->PrevBlockInfo;
5251 QualType RetTy = Context.VoidTy;
5252 if (!BSI->ReturnType.isNull())
5253 RetTy = BSI->ReturnType;
5255 llvm::SmallVector<QualType, 8> ArgTypes;
5256 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i)
5257 ArgTypes.push_back(BSI->Params[i]->getType());
5260 if (!BSI->hasPrototype)
5261 BlockTy = Context.getFunctionType(RetTy, 0, 0, false, 0);
5263 BlockTy = Context.getFunctionType(RetTy, ArgTypes.data(), ArgTypes.size(),
5264 BSI->isVariadic, 0);
5266 // FIXME: Check that return/parameter types are complete/non-abstract
5267 DiagnoseUnusedParameters(BSI->Params.begin(), BSI->Params.end());
5268 BlockTy = Context.getBlockPointerType(BlockTy);
5270 // If needed, diagnose invalid gotos and switches in the block.
5271 if (CurFunctionNeedsScopeChecking)
5272 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get()));
5273 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking;
5275 BSI->TheDecl->setBody(body.takeAs<CompoundStmt>());
5276 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy,
5277 BSI->hasBlockDeclRefExprs));
5280 Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc,
5281 ExprArg expr, TypeTy *type,
5282 SourceLocation RPLoc) {
5283 QualType T = QualType::getFromOpaquePtr(type);
5284 Expr *E = static_cast<Expr*>(expr.get());
5287 InitBuiltinVaListType();
5289 // Get the va_list type
5290 QualType VaListType = Context.getBuiltinVaListType();
5291 if (VaListType->isArrayType()) {
5292 // Deal with implicit array decay; for example, on x86-64,
5293 // va_list is an array, but it's supposed to decay to
5294 // a pointer for va_arg.
5295 VaListType = Context.getArrayDecayedType(VaListType);
5296 // Make sure the input expression also decays appropriately.
5297 UsualUnaryConversions(E);
5299 // Otherwise, the va_list argument must be an l-value because
5300 // it is modified by va_arg.
5301 if (!E->isTypeDependent() &&
5302 CheckForModifiableLvalue(E, BuiltinLoc, *this))
5306 if (!E->isTypeDependent() &&
5307 !Context.hasSameType(VaListType, E->getType())) {
5308 return ExprError(Diag(E->getLocStart(),
5309 diag::err_first_argument_to_va_arg_not_of_type_va_list)
5310 << OrigExpr->getType() << E->getSourceRange());
5313 // FIXME: Check that type is complete/non-abstract
5314 // FIXME: Warn if a non-POD type is passed in.
5317 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(),
5321 Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) {
5322 // The type of __null will be int or long, depending on the size of
5323 // pointers on the target.
5325 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth())
5328 Ty = Context.LongTy;
5330 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc));
5333 bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy,
5335 QualType DstType, QualType SrcType,
5336 Expr *SrcExpr, const char *Flavor) {
5337 // Decode the result (notice that AST's are still created for extensions).
5338 bool isInvalid = false;
5341 default: assert(0 && "Unknown conversion type");
5342 case Compatible: return false;
5344 DiagKind = diag::ext_typecheck_convert_pointer_int;
5347 DiagKind = diag::ext_typecheck_convert_int_pointer;
5349 case IncompatiblePointer:
5350 DiagKind = diag::ext_typecheck_convert_incompatible_pointer;
5352 case IncompatiblePointerSign:
5353 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign;
5355 case FunctionVoidPointer:
5356 DiagKind = diag::ext_typecheck_convert_pointer_void_func;
5358 case CompatiblePointerDiscardsQualifiers:
5359 // If the qualifiers lost were because we were applying the
5360 // (deprecated) C++ conversion from a string literal to a char*
5361 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME:
5362 // Ideally, this check would be performed in
5363 // CheckPointerTypesForAssignment. However, that would require a
5364 // bit of refactoring (so that the second argument is an
5365 // expression, rather than a type), which should be done as part
5366 // of a larger effort to fix CheckPointerTypesForAssignment for
5368 if (getLangOptions().CPlusPlus &&
5369 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType))
5371 DiagKind = diag::ext_typecheck_convert_discards_qualifiers;
5373 case IntToBlockPointer:
5374 DiagKind = diag::err_int_to_block_pointer;
5376 case IncompatibleBlockPointer:
5377 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer;
5379 case IncompatibleObjCQualifiedId:
5380 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since
5381 // it can give a more specific diagnostic.
5382 DiagKind = diag::warn_incompatible_qualified_id;
5384 case IncompatibleVectors:
5385 DiagKind = diag::warn_incompatible_vectors;
5388 DiagKind = diag::err_typecheck_convert_incompatible;
5393 Diag(Loc, DiagKind) << DstType << SrcType << Flavor
5394 << SrcExpr->getSourceRange();
5398 bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){
5399 llvm::APSInt ICEResult;
5400 if (E->isIntegerConstantExpr(ICEResult, Context)) {
5402 *Result = ICEResult;
5406 Expr::EvalResult EvalResult;
5408 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() ||
5409 EvalResult.HasSideEffects) {
5410 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange();
5412 if (EvalResult.Diag) {
5413 // We only show the note if it's not the usual "invalid subexpression"
5414 // or if it's actually in a subexpression.
5415 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice ||
5416 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens())
5417 Diag(EvalResult.DiagLoc, EvalResult.Diag);
5423 Diag(E->getExprLoc(), diag::ext_expr_not_ice) <<
5424 E->getSourceRange();
5426 if (EvalResult.Diag &&
5427 Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored)
5428 Diag(EvalResult.DiagLoc, EvalResult.Diag);
5431 *Result = EvalResult.Val.getInt();
5436 /// \brief Note that the given declaration was referenced in the source code.
5438 /// This routine should be invoke whenever a given declaration is referenced
5439 /// in the source code, and where that reference occurred. If this declaration
5440 /// reference means that the the declaration is used (C++ [basic.def.odr]p2,
5441 /// C99 6.9p3), then the declaration will be marked as used.
5443 /// \param Loc the location where the declaration was referenced.
5445 /// \param D the declaration that has been referenced by the source code.
5446 void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) {
5447 assert(D && "No declaration?");
5449 // Mark a parameter declaration "used", regardless of whether we're in a
5451 if (isa<ParmVarDecl>(D))
5454 // Do not mark anything as "used" within a dependent context; wait for
5455 // an instantiation.
5456 if (CurContext->isDependentContext())
5459 // If we are in an unevaluated operand, don't mark any definitions as used.
5460 if (InUnevaluatedOperand)
5463 // Note that this declaration has been used.
5464 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) {
5465 // FIXME: implicit template instantiation
5466 // FIXME: keep track of references to static functions
5468 Function->setUsed(true);
5472 if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
5474 // FIXME: implicit template instantiation
5475 // FIXME: keep track of references to static data?