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author | ed <ed@FreeBSD.org> | 2009-06-02 17:58:47 +0000 |
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committer | ed <ed@FreeBSD.org> | 2009-06-02 17:58:47 +0000 |
commit | f27e5a09a0d815b8a4814152954ff87dadfdefc0 (patch) | |
tree | ce7d964cbb5e39695b71481698f10cb099c23d4a /lib/Sema/SemaExpr.cpp | |
download | FreeBSD-src-f27e5a09a0d815b8a4814152954ff87dadfdefc0.zip FreeBSD-src-f27e5a09a0d815b8a4814152954ff87dadfdefc0.tar.gz |
Import Clang, at r72732.
Diffstat (limited to 'lib/Sema/SemaExpr.cpp')
-rw-r--r-- | lib/Sema/SemaExpr.cpp | 5395 |
1 files changed, 5395 insertions, 0 deletions
diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp new file mode 100644 index 0000000..ee5132a --- /dev/null +++ b/lib/Sema/SemaExpr.cpp @@ -0,0 +1,5395 @@ +//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements semantic analysis for expressions. +// +//===----------------------------------------------------------------------===// + +#include "Sema.h" +#include "clang/AST/ASTContext.h" +#include "clang/AST/DeclObjC.h" +#include "clang/AST/ExprCXX.h" +#include "clang/AST/ExprObjC.h" +#include "clang/AST/DeclTemplate.h" +#include "clang/Lex/Preprocessor.h" +#include "clang/Lex/LiteralSupport.h" +#include "clang/Basic/SourceManager.h" +#include "clang/Basic/TargetInfo.h" +#include "clang/Parse/DeclSpec.h" +#include "clang/Parse/Designator.h" +#include "clang/Parse/Scope.h" +using namespace clang; + +/// \brief Determine whether the use of this declaration is valid, and +/// emit any corresponding diagnostics. +/// +/// This routine diagnoses various problems with referencing +/// declarations that can occur when using a declaration. For example, +/// it might warn if a deprecated or unavailable declaration is being +/// used, or produce an error (and return true) if a C++0x deleted +/// function is being used. +/// +/// \returns true if there was an error (this declaration cannot be +/// referenced), false otherwise. +bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc) { + // See if the decl is deprecated. + if (D->getAttr<DeprecatedAttr>()) { + // Implementing deprecated stuff requires referencing deprecated + // stuff. Don't warn if we are implementing a deprecated + // construct. + bool isSilenced = false; + + if (NamedDecl *ND = getCurFunctionOrMethodDecl()) { + // If this reference happens *in* a deprecated function or method, don't + // warn. + isSilenced = ND->getAttr<DeprecatedAttr>(); + + // If this is an Objective-C method implementation, check to see if the + // method was deprecated on the declaration, not the definition. + if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(ND)) { + // The semantic decl context of a ObjCMethodDecl is the + // ObjCImplementationDecl. + if (ObjCImplementationDecl *Impl + = dyn_cast<ObjCImplementationDecl>(MD->getParent())) { + + MD = Impl->getClassInterface()->getMethod(Context, + MD->getSelector(), + MD->isInstanceMethod()); + isSilenced |= MD && MD->getAttr<DeprecatedAttr>(); + } + } + } + + if (!isSilenced) + Diag(Loc, diag::warn_deprecated) << D->getDeclName(); + } + + // See if this is a deleted function. + if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { + if (FD->isDeleted()) { + Diag(Loc, diag::err_deleted_function_use); + Diag(D->getLocation(), diag::note_unavailable_here) << true; + return true; + } + } + + // See if the decl is unavailable + if (D->getAttr<UnavailableAttr>()) { + Diag(Loc, diag::warn_unavailable) << D->getDeclName(); + Diag(D->getLocation(), diag::note_unavailable_here) << 0; + } + + return false; +} + +/// DiagnoseSentinelCalls - This routine checks on method dispatch calls +/// (and other functions in future), which have been declared with sentinel +/// attribute. It warns if call does not have the sentinel argument. +/// +void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc, + Expr **Args, unsigned NumArgs) +{ + const SentinelAttr *attr = D->getAttr<SentinelAttr>(); + if (!attr) + return; + int sentinelPos = attr->getSentinel(); + int nullPos = attr->getNullPos(); + + // FIXME. ObjCMethodDecl and FunctionDecl need be derived from the same common + // base class. Then we won't be needing two versions of the same code. + unsigned int i = 0; + bool warnNotEnoughArgs = false; + int isMethod = 0; + if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) { + // skip over named parameters. + ObjCMethodDecl::param_iterator P, E = MD->param_end(); + for (P = MD->param_begin(); (P != E && i < NumArgs); ++P) { + if (nullPos) + --nullPos; + else + ++i; + } + warnNotEnoughArgs = (P != E || i >= NumArgs); + isMethod = 1; + } + else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { + // skip over named parameters. + ObjCMethodDecl::param_iterator P, E = FD->param_end(); + for (P = FD->param_begin(); (P != E && i < NumArgs); ++P) { + if (nullPos) + --nullPos; + else + ++i; + } + warnNotEnoughArgs = (P != E || i >= NumArgs); + } + else if (VarDecl *V = dyn_cast<VarDecl>(D)) { + // block or function pointer call. + QualType Ty = V->getType(); + if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) { + const FunctionType *FT = Ty->isFunctionPointerType() + ? Ty->getAsPointerType()->getPointeeType()->getAsFunctionType() + : Ty->getAsBlockPointerType()->getPointeeType()->getAsFunctionType(); + if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FT)) { + unsigned NumArgsInProto = Proto->getNumArgs(); + unsigned k; + for (k = 0; (k != NumArgsInProto && i < NumArgs); k++) { + if (nullPos) + --nullPos; + else + ++i; + } + warnNotEnoughArgs = (k != NumArgsInProto || i >= NumArgs); + } + if (Ty->isBlockPointerType()) + isMethod = 2; + } + else + return; + } + else + return; + + if (warnNotEnoughArgs) { + Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName(); + Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; + return; + } + int sentinel = i; + while (sentinelPos > 0 && i < NumArgs-1) { + --sentinelPos; + ++i; + } + if (sentinelPos > 0) { + Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName(); + Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; + return; + } + while (i < NumArgs-1) { + ++i; + ++sentinel; + } + Expr *sentinelExpr = Args[sentinel]; + if (sentinelExpr && (!sentinelExpr->getType()->isPointerType() || + !sentinelExpr->isNullPointerConstant(Context))) { + Diag(Loc, diag::warn_missing_sentinel) << isMethod; + Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; + } + return; +} + +SourceRange Sema::getExprRange(ExprTy *E) const { + Expr *Ex = (Expr *)E; + return Ex? Ex->getSourceRange() : SourceRange(); +} + +//===----------------------------------------------------------------------===// +// Standard Promotions and Conversions +//===----------------------------------------------------------------------===// + +/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). +void Sema::DefaultFunctionArrayConversion(Expr *&E) { + QualType Ty = E->getType(); + assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); + + if (Ty->isFunctionType()) + ImpCastExprToType(E, Context.getPointerType(Ty)); + else if (Ty->isArrayType()) { + // In C90 mode, arrays only promote to pointers if the array expression is + // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has + // type 'array of type' is converted to an expression that has type 'pointer + // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression + // that has type 'array of type' ...". The relevant change is "an lvalue" + // (C90) to "an expression" (C99). + // + // C++ 4.2p1: + // An lvalue or rvalue of type "array of N T" or "array of unknown bound of + // T" can be converted to an rvalue of type "pointer to T". + // + if (getLangOptions().C99 || getLangOptions().CPlusPlus || + E->isLvalue(Context) == Expr::LV_Valid) + ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); + } +} + +/// \brief Whether this is a promotable bitfield reference according +/// to C99 6.3.1.1p2, bullet 2. +/// +/// \returns the type this bit-field will promote to, or NULL if no +/// promotion occurs. +static QualType isPromotableBitField(Expr *E, ASTContext &Context) { + FieldDecl *Field = E->getBitField(); + if (!Field) + return QualType(); + + const BuiltinType *BT = Field->getType()->getAsBuiltinType(); + if (!BT) + return QualType(); + + if (BT->getKind() != BuiltinType::Bool && + BT->getKind() != BuiltinType::Int && + BT->getKind() != BuiltinType::UInt) + return QualType(); + + llvm::APSInt BitWidthAP; + if (!Field->getBitWidth()->isIntegerConstantExpr(BitWidthAP, Context)) + return QualType(); + + uint64_t BitWidth = BitWidthAP.getZExtValue(); + uint64_t IntSize = Context.getTypeSize(Context.IntTy); + if (BitWidth < IntSize || + (Field->getType()->isSignedIntegerType() && BitWidth == IntSize)) + return Context.IntTy; + + if (BitWidth == IntSize && Field->getType()->isUnsignedIntegerType()) + return Context.UnsignedIntTy; + + return QualType(); +} + +/// UsualUnaryConversions - Performs various conversions that are common to most +/// operators (C99 6.3). The conversions of array and function types are +/// sometimes surpressed. For example, the array->pointer conversion doesn't +/// apply if the array is an argument to the sizeof or address (&) operators. +/// In these instances, this routine should *not* be called. +Expr *Sema::UsualUnaryConversions(Expr *&Expr) { + QualType Ty = Expr->getType(); + assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); + + // C99 6.3.1.1p2: + // + // The following may be used in an expression wherever an int or + // unsigned int may be used: + // - an object or expression with an integer type whose integer + // conversion rank is less than or equal to the rank of int + // and unsigned int. + // - A bit-field of type _Bool, int, signed int, or unsigned int. + // + // If an int can represent all values of the original type, the + // value is converted to an int; otherwise, it is converted to an + // unsigned int. These are called the integer promotions. All + // other types are unchanged by the integer promotions. + if (Ty->isPromotableIntegerType()) { + ImpCastExprToType(Expr, Context.IntTy); + return Expr; + } else { + QualType T = isPromotableBitField(Expr, Context); + if (!T.isNull()) { + ImpCastExprToType(Expr, T); + return Expr; + } + } + + DefaultFunctionArrayConversion(Expr); + return Expr; +} + +/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that +/// do not have a prototype. Arguments that have type float are promoted to +/// double. All other argument types are converted by UsualUnaryConversions(). +void Sema::DefaultArgumentPromotion(Expr *&Expr) { + QualType Ty = Expr->getType(); + assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); + + // If this is a 'float' (CVR qualified or typedef) promote to double. + if (const BuiltinType *BT = Ty->getAsBuiltinType()) + if (BT->getKind() == BuiltinType::Float) + return ImpCastExprToType(Expr, Context.DoubleTy); + + UsualUnaryConversions(Expr); +} + +/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but +/// will warn if the resulting type is not a POD type, and rejects ObjC +/// interfaces passed by value. This returns true if the argument type is +/// completely illegal. +bool Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) { + DefaultArgumentPromotion(Expr); + + if (Expr->getType()->isObjCInterfaceType()) { + Diag(Expr->getLocStart(), + diag::err_cannot_pass_objc_interface_to_vararg) + << Expr->getType() << CT; + return true; + } + + if (!Expr->getType()->isPODType()) + Diag(Expr->getLocStart(), diag::warn_cannot_pass_non_pod_arg_to_vararg) + << Expr->getType() << CT; + + return false; +} + + +/// UsualArithmeticConversions - Performs various conversions that are common to +/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this +/// routine returns the first non-arithmetic type found. The client is +/// responsible for emitting appropriate error diagnostics. +/// FIXME: verify the conversion rules for "complex int" are consistent with +/// GCC. +QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, + bool isCompAssign) { + if (!isCompAssign) + UsualUnaryConversions(lhsExpr); + + UsualUnaryConversions(rhsExpr); + + // For conversion purposes, we ignore any qualifiers. + // For example, "const float" and "float" are equivalent. + QualType lhs = + Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); + QualType rhs = + Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); + + // If both types are identical, no conversion is needed. + if (lhs == rhs) + return lhs; + + // If either side is a non-arithmetic type (e.g. a pointer), we are done. + // The caller can deal with this (e.g. pointer + int). + if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) + return lhs; + + // Perform bitfield promotions. + QualType LHSBitfieldPromoteTy = isPromotableBitField(lhsExpr, Context); + if (!LHSBitfieldPromoteTy.isNull()) + lhs = LHSBitfieldPromoteTy; + QualType RHSBitfieldPromoteTy = isPromotableBitField(rhsExpr, Context); + if (!RHSBitfieldPromoteTy.isNull()) + rhs = RHSBitfieldPromoteTy; + + QualType destType = UsualArithmeticConversionsType(lhs, rhs); + if (!isCompAssign) + ImpCastExprToType(lhsExpr, destType); + ImpCastExprToType(rhsExpr, destType); + return destType; +} + +QualType Sema::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { + // Perform the usual unary conversions. We do this early so that + // integral promotions to "int" can allow us to exit early, in the + // lhs == rhs check. Also, for conversion purposes, we ignore any + // qualifiers. For example, "const float" and "float" are + // equivalent. + if (lhs->isPromotableIntegerType()) + lhs = Context.IntTy; + else + lhs = lhs.getUnqualifiedType(); + if (rhs->isPromotableIntegerType()) + rhs = Context.IntTy; + else + rhs = rhs.getUnqualifiedType(); + + // If both types are identical, no conversion is needed. + if (lhs == rhs) + return lhs; + + // If either side is a non-arithmetic type (e.g. a pointer), we are done. + // The caller can deal with this (e.g. pointer + int). + if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) + return lhs; + + // At this point, we have two different arithmetic types. + + // Handle complex types first (C99 6.3.1.8p1). + if (lhs->isComplexType() || rhs->isComplexType()) { + // if we have an integer operand, the result is the complex type. + if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { + // convert the rhs to the lhs complex type. + return lhs; + } + if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { + // convert the lhs to the rhs complex type. + return rhs; + } + // This handles complex/complex, complex/float, or float/complex. + // When both operands are complex, the shorter operand is converted to the + // type of the longer, and that is the type of the result. This corresponds + // to what is done when combining two real floating-point operands. + // The fun begins when size promotion occur across type domains. + // From H&S 6.3.4: When one operand is complex and the other is a real + // floating-point type, the less precise type is converted, within it's + // real or complex domain, to the precision of the other type. For example, + // when combining a "long double" with a "double _Complex", the + // "double _Complex" is promoted to "long double _Complex". + int result = Context.getFloatingTypeOrder(lhs, rhs); + + if (result > 0) { // The left side is bigger, convert rhs. + rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); + } else if (result < 0) { // The right side is bigger, convert lhs. + lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); + } + // At this point, lhs and rhs have the same rank/size. Now, make sure the + // domains match. This is a requirement for our implementation, C99 + // does not require this promotion. + if (lhs != rhs) { // Domains don't match, we have complex/float mix. + if (lhs->isRealFloatingType()) { // handle "double, _Complex double". + return rhs; + } else { // handle "_Complex double, double". + return lhs; + } + } + return lhs; // The domain/size match exactly. + } + // Now handle "real" floating types (i.e. float, double, long double). + if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { + // if we have an integer operand, the result is the real floating type. + if (rhs->isIntegerType()) { + // convert rhs to the lhs floating point type. + return lhs; + } + if (rhs->isComplexIntegerType()) { + // convert rhs to the complex floating point type. + return Context.getComplexType(lhs); + } + if (lhs->isIntegerType()) { + // convert lhs to the rhs floating point type. + return rhs; + } + if (lhs->isComplexIntegerType()) { + // convert lhs to the complex floating point type. + return Context.getComplexType(rhs); + } + // We have two real floating types, float/complex combos were handled above. + // Convert the smaller operand to the bigger result. + int result = Context.getFloatingTypeOrder(lhs, rhs); + if (result > 0) // convert the rhs + return lhs; + assert(result < 0 && "illegal float comparison"); + return rhs; // convert the lhs + } + if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { + // Handle GCC complex int extension. + const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); + const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); + + if (lhsComplexInt && rhsComplexInt) { + if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), + rhsComplexInt->getElementType()) >= 0) + return lhs; // convert the rhs + return rhs; + } else if (lhsComplexInt && rhs->isIntegerType()) { + // convert the rhs to the lhs complex type. + return lhs; + } else if (rhsComplexInt && lhs->isIntegerType()) { + // convert the lhs to the rhs complex type. + return rhs; + } + } + // Finally, we have two differing integer types. + // The rules for this case are in C99 6.3.1.8 + int compare = Context.getIntegerTypeOrder(lhs, rhs); + bool lhsSigned = lhs->isSignedIntegerType(), + rhsSigned = rhs->isSignedIntegerType(); + QualType destType; + if (lhsSigned == rhsSigned) { + // Same signedness; use the higher-ranked type + destType = compare >= 0 ? lhs : rhs; + } else if (compare != (lhsSigned ? 1 : -1)) { + // The unsigned type has greater than or equal rank to the + // signed type, so use the unsigned type + destType = lhsSigned ? rhs : lhs; + } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { + // The two types are different widths; if we are here, that + // means the signed type is larger than the unsigned type, so + // use the signed type. + destType = lhsSigned ? lhs : rhs; + } else { + // The signed type is higher-ranked than the unsigned type, + // but isn't actually any bigger (like unsigned int and long + // on most 32-bit systems). Use the unsigned type corresponding + // to the signed type. + destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); + } + return destType; +} + +//===----------------------------------------------------------------------===// +// Semantic Analysis for various Expression Types +//===----------------------------------------------------------------------===// + + +/// ActOnStringLiteral - The specified tokens were lexed as pasted string +/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string +/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from +/// multiple tokens. However, the common case is that StringToks points to one +/// string. +/// +Action::OwningExprResult +Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { + assert(NumStringToks && "Must have at least one string!"); + + StringLiteralParser Literal(StringToks, NumStringToks, PP); + if (Literal.hadError) + return ExprError(); + + llvm::SmallVector<SourceLocation, 4> StringTokLocs; + for (unsigned i = 0; i != NumStringToks; ++i) + StringTokLocs.push_back(StringToks[i].getLocation()); + + QualType StrTy = Context.CharTy; + if (Literal.AnyWide) StrTy = Context.getWCharType(); + if (Literal.Pascal) StrTy = Context.UnsignedCharTy; + + // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). + if (getLangOptions().CPlusPlus) + StrTy.addConst(); + + // Get an array type for the string, according to C99 6.4.5. This includes + // the nul terminator character as well as the string length for pascal + // strings. + StrTy = Context.getConstantArrayType(StrTy, + llvm::APInt(32, Literal.GetNumStringChars()+1), + ArrayType::Normal, 0); + + // Pass &StringTokLocs[0], StringTokLocs.size() to factory! + return Owned(StringLiteral::Create(Context, Literal.GetString(), + Literal.GetStringLength(), + Literal.AnyWide, StrTy, + &StringTokLocs[0], + StringTokLocs.size())); +} + +/// ShouldSnapshotBlockValueReference - Return true if a reference inside of +/// CurBlock to VD should cause it to be snapshotted (as we do for auto +/// variables defined outside the block) or false if this is not needed (e.g. +/// for values inside the block or for globals). +/// +/// This also keeps the 'hasBlockDeclRefExprs' in the BlockSemaInfo records +/// up-to-date. +/// +static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, + ValueDecl *VD) { + // If the value is defined inside the block, we couldn't snapshot it even if + // we wanted to. + if (CurBlock->TheDecl == VD->getDeclContext()) + return false; + + // If this is an enum constant or function, it is constant, don't snapshot. + if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) + return false; + + // If this is a reference to an extern, static, or global variable, no need to + // snapshot it. + // FIXME: What about 'const' variables in C++? + if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) + if (!Var->hasLocalStorage()) + return false; + + // Blocks that have these can't be constant. + CurBlock->hasBlockDeclRefExprs = true; + + // If we have nested blocks, the decl may be declared in an outer block (in + // which case that outer block doesn't get "hasBlockDeclRefExprs") or it may + // be defined outside all of the current blocks (in which case the blocks do + // all get the bit). Walk the nesting chain. + for (BlockSemaInfo *NextBlock = CurBlock->PrevBlockInfo; NextBlock; + NextBlock = NextBlock->PrevBlockInfo) { + // If we found the defining block for the variable, don't mark the block as + // having a reference outside it. + if (NextBlock->TheDecl == VD->getDeclContext()) + break; + + // Otherwise, the DeclRef from the inner block causes the outer one to need + // a snapshot as well. + NextBlock->hasBlockDeclRefExprs = true; + } + + return true; +} + + + +/// ActOnIdentifierExpr - The parser read an identifier in expression context, +/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this +/// identifier is used in a function call context. +/// SS is only used for a C++ qualified-id (foo::bar) to indicate the +/// class or namespace that the identifier must be a member of. +Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, + IdentifierInfo &II, + bool HasTrailingLParen, + const CXXScopeSpec *SS, + bool isAddressOfOperand) { + return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS, + isAddressOfOperand); +} + +/// BuildDeclRefExpr - Build either a DeclRefExpr or a +/// QualifiedDeclRefExpr based on whether or not SS is a +/// nested-name-specifier. +DeclRefExpr * +Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, + bool TypeDependent, bool ValueDependent, + const CXXScopeSpec *SS) { + if (SS && !SS->isEmpty()) { + return new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent, + ValueDependent, SS->getRange(), + static_cast<NestedNameSpecifier *>(SS->getScopeRep())); + } else + return new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); +} + +/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or +/// variable corresponding to the anonymous union or struct whose type +/// is Record. +static Decl *getObjectForAnonymousRecordDecl(ASTContext &Context, + RecordDecl *Record) { + assert(Record->isAnonymousStructOrUnion() && + "Record must be an anonymous struct or union!"); + + // FIXME: Once Decls are directly linked together, this will be an O(1) + // operation rather than a slow walk through DeclContext's vector (which + // itself will be eliminated). DeclGroups might make this even better. + DeclContext *Ctx = Record->getDeclContext(); + for (DeclContext::decl_iterator D = Ctx->decls_begin(Context), + DEnd = Ctx->decls_end(Context); + D != DEnd; ++D) { + if (*D == Record) { + // The object for the anonymous struct/union directly + // follows its type in the list of declarations. + ++D; + assert(D != DEnd && "Missing object for anonymous record"); + assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); + return *D; + } + } + + assert(false && "Missing object for anonymous record"); + return 0; +} + +/// \brief Given a field that represents a member of an anonymous +/// struct/union, build the path from that field's context to the +/// actual member. +/// +/// Construct the sequence of field member references we'll have to +/// perform to get to the field in the anonymous union/struct. The +/// list of members is built from the field outward, so traverse it +/// backwards to go from an object in the current context to the field +/// we found. +/// +/// \returns The variable from which the field access should begin, +/// for an anonymous struct/union that is not a member of another +/// class. Otherwise, returns NULL. +VarDecl *Sema::BuildAnonymousStructUnionMemberPath(FieldDecl *Field, + llvm::SmallVectorImpl<FieldDecl *> &Path) { + assert(Field->getDeclContext()->isRecord() && + cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() + && "Field must be stored inside an anonymous struct or union"); + + Path.push_back(Field); + VarDecl *BaseObject = 0; + DeclContext *Ctx = Field->getDeclContext(); + do { + RecordDecl *Record = cast<RecordDecl>(Ctx); + Decl *AnonObject = getObjectForAnonymousRecordDecl(Context, Record); + if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) + Path.push_back(AnonField); + else { + BaseObject = cast<VarDecl>(AnonObject); + break; + } + Ctx = Ctx->getParent(); + } while (Ctx->isRecord() && + cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); + + return BaseObject; +} + +Sema::OwningExprResult +Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, + FieldDecl *Field, + Expr *BaseObjectExpr, + SourceLocation OpLoc) { + llvm::SmallVector<FieldDecl *, 4> AnonFields; + VarDecl *BaseObject = BuildAnonymousStructUnionMemberPath(Field, + AnonFields); + + // Build the expression that refers to the base object, from + // which we will build a sequence of member references to each + // of the anonymous union objects and, eventually, the field we + // found via name lookup. + bool BaseObjectIsPointer = false; + unsigned ExtraQuals = 0; + if (BaseObject) { + // BaseObject is an anonymous struct/union variable (and is, + // therefore, not part of another non-anonymous record). + if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); + BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), + SourceLocation()); + ExtraQuals + = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); + } else if (BaseObjectExpr) { + // The caller provided the base object expression. Determine + // whether its a pointer and whether it adds any qualifiers to the + // anonymous struct/union fields we're looking into. + QualType ObjectType = BaseObjectExpr->getType(); + if (const PointerType *ObjectPtr = ObjectType->getAsPointerType()) { + BaseObjectIsPointer = true; + ObjectType = ObjectPtr->getPointeeType(); + } + ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); + } else { + // We've found a member of an anonymous struct/union that is + // inside a non-anonymous struct/union, so in a well-formed + // program our base object expression is "this". + if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { + if (!MD->isStatic()) { + QualType AnonFieldType + = Context.getTagDeclType( + cast<RecordDecl>(AnonFields.back()->getDeclContext())); + QualType ThisType = Context.getTagDeclType(MD->getParent()); + if ((Context.getCanonicalType(AnonFieldType) + == Context.getCanonicalType(ThisType)) || + IsDerivedFrom(ThisType, AnonFieldType)) { + // Our base object expression is "this". + BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), + MD->getThisType(Context)); + BaseObjectIsPointer = true; + } + } else { + return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) + << Field->getDeclName()); + } + ExtraQuals = MD->getTypeQualifiers(); + } + + if (!BaseObjectExpr) + return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) + << Field->getDeclName()); + } + + // Build the implicit member references to the field of the + // anonymous struct/union. + Expr *Result = BaseObjectExpr; + for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator + FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); + FI != FIEnd; ++FI) { + QualType MemberType = (*FI)->getType(); + if (!(*FI)->isMutable()) { + unsigned combinedQualifiers + = MemberType.getCVRQualifiers() | ExtraQuals; + MemberType = MemberType.getQualifiedType(combinedQualifiers); + } + Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, + OpLoc, MemberType); + BaseObjectIsPointer = false; + ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); + } + + return Owned(Result); +} + +/// ActOnDeclarationNameExpr - The parser has read some kind of name +/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine +/// performs lookup on that name and returns an expression that refers +/// to that name. This routine isn't directly called from the parser, +/// because the parser doesn't know about DeclarationName. Rather, +/// this routine is called by ActOnIdentifierExpr, +/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, +/// which form the DeclarationName from the corresponding syntactic +/// forms. +/// +/// HasTrailingLParen indicates whether this identifier is used in a +/// function call context. LookupCtx is only used for a C++ +/// qualified-id (foo::bar) to indicate the class or namespace that +/// the identifier must be a member of. +/// +/// isAddressOfOperand means that this expression is the direct operand +/// of an address-of operator. This matters because this is the only +/// situation where a qualified name referencing a non-static member may +/// appear outside a member function of this class. +Sema::OwningExprResult +Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, + DeclarationName Name, bool HasTrailingLParen, + const CXXScopeSpec *SS, + bool isAddressOfOperand) { + // Could be enum-constant, value decl, instance variable, etc. + if (SS && SS->isInvalid()) + return ExprError(); + + // C++ [temp.dep.expr]p3: + // An id-expression is type-dependent if it contains: + // -- a nested-name-specifier that contains a class-name that + // names a dependent type. + // FIXME: Member of the current instantiation. + if (SS && isDependentScopeSpecifier(*SS)) { + return Owned(new (Context) UnresolvedDeclRefExpr(Name, Context.DependentTy, + Loc, SS->getRange(), + static_cast<NestedNameSpecifier *>(SS->getScopeRep()))); + } + + LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, + false, true, Loc); + + if (Lookup.isAmbiguous()) { + DiagnoseAmbiguousLookup(Lookup, Name, Loc, + SS && SS->isSet() ? SS->getRange() + : SourceRange()); + return ExprError(); + } + + NamedDecl *D = Lookup.getAsDecl(); + + // If this reference is in an Objective-C method, then ivar lookup happens as + // well. + IdentifierInfo *II = Name.getAsIdentifierInfo(); + if (II && getCurMethodDecl()) { + // There are two cases to handle here. 1) scoped lookup could have failed, + // in which case we should look for an ivar. 2) scoped lookup could have + // found a decl, but that decl is outside the current instance method (i.e. + // a global variable). In these two cases, we do a lookup for an ivar with + // this name, if the lookup sucedes, we replace it our current decl. + if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { + ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); + ObjCInterfaceDecl *ClassDeclared; + if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(Context, II, + ClassDeclared)) { + // Check if referencing a field with __attribute__((deprecated)). + if (DiagnoseUseOfDecl(IV, Loc)) + return ExprError(); + + // If we're referencing an invalid decl, just return this as a silent + // error node. The error diagnostic was already emitted on the decl. + if (IV->isInvalidDecl()) + return ExprError(); + + bool IsClsMethod = getCurMethodDecl()->isClassMethod(); + // If a class method attemps to use a free standing ivar, this is + // an error. + if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) + return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) + << IV->getDeclName()); + // If a class method uses a global variable, even if an ivar with + // same name exists, use the global. + if (!IsClsMethod) { + if (IV->getAccessControl() == ObjCIvarDecl::Private && + ClassDeclared != IFace) + Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); + // FIXME: This should use a new expr for a direct reference, don't + // turn this into Self->ivar, just return a BareIVarExpr or something. + IdentifierInfo &II = Context.Idents.get("self"); + OwningExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); + return Owned(new (Context) + ObjCIvarRefExpr(IV, IV->getType(), Loc, + SelfExpr.takeAs<Expr>(), true, true)); + } + } + } + else if (getCurMethodDecl()->isInstanceMethod()) { + // We should warn if a local variable hides an ivar. + ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); + ObjCInterfaceDecl *ClassDeclared; + if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(Context, II, + ClassDeclared)) { + if (IV->getAccessControl() != ObjCIvarDecl::Private || + IFace == ClassDeclared) + Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName(); + } + } + // Needed to implement property "super.method" notation. + if (D == 0 && II->isStr("super")) { + QualType T; + + if (getCurMethodDecl()->isInstanceMethod()) + T = Context.getPointerType(Context.getObjCInterfaceType( + getCurMethodDecl()->getClassInterface())); + else + T = Context.getObjCClassType(); + return Owned(new (Context) ObjCSuperExpr(Loc, T)); + } + } + + // Determine whether this name might be a candidate for + // argument-dependent lookup. + bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && + HasTrailingLParen; + + if (ADL && D == 0) { + // We've seen something of the form + // + // identifier( + // + // and we did not find any entity by the name + // "identifier". However, this identifier is still subject to + // argument-dependent lookup, so keep track of the name. + return Owned(new (Context) UnresolvedFunctionNameExpr(Name, + Context.OverloadTy, + Loc)); + } + + if (D == 0) { + // Otherwise, this could be an implicitly declared function reference (legal + // in C90, extension in C99). + if (HasTrailingLParen && II && + !getLangOptions().CPlusPlus) // Not in C++. + D = ImplicitlyDefineFunction(Loc, *II, S); + else { + // If this name wasn't predeclared and if this is not a function call, + // diagnose the problem. + if (SS && !SS->isEmpty()) + return ExprError(Diag(Loc, diag::err_typecheck_no_member) + << Name << SS->getRange()); + else if (Name.getNameKind() == DeclarationName::CXXOperatorName || + Name.getNameKind() == DeclarationName::CXXConversionFunctionName) + return ExprError(Diag(Loc, diag::err_undeclared_use) + << Name.getAsString()); + else + return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); + } + } + + // If this is an expression of the form &Class::member, don't build an + // implicit member ref, because we want a pointer to the member in general, + // not any specific instance's member. + if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { + DeclContext *DC = computeDeclContext(*SS); + if (D && isa<CXXRecordDecl>(DC)) { + QualType DType; + if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { + DType = FD->getType().getNonReferenceType(); + } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { + DType = Method->getType(); + } else if (isa<OverloadedFunctionDecl>(D)) { + DType = Context.OverloadTy; + } + // Could be an inner type. That's diagnosed below, so ignore it here. + if (!DType.isNull()) { + // The pointer is type- and value-dependent if it points into something + // dependent. + bool Dependent = DC->isDependentContext(); + return Owned(BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS)); + } + } + } + + // We may have found a field within an anonymous union or struct + // (C++ [class.union]). + if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) + if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) + return BuildAnonymousStructUnionMemberReference(Loc, FD); + + if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { + if (!MD->isStatic()) { + // C++ [class.mfct.nonstatic]p2: + // [...] if name lookup (3.4.1) resolves the name in the + // id-expression to a nonstatic nontype member of class X or of + // a base class of X, the id-expression is transformed into a + // class member access expression (5.2.5) using (*this) (9.3.2) + // as the postfix-expression to the left of the '.' operator. + DeclContext *Ctx = 0; + QualType MemberType; + if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { + Ctx = FD->getDeclContext(); + MemberType = FD->getType(); + + if (const ReferenceType *RefType = MemberType->getAsReferenceType()) + MemberType = RefType->getPointeeType(); + else if (!FD->isMutable()) { + unsigned combinedQualifiers + = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); + MemberType = MemberType.getQualifiedType(combinedQualifiers); + } + } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { + if (!Method->isStatic()) { + Ctx = Method->getParent(); + MemberType = Method->getType(); + } + } else if (OverloadedFunctionDecl *Ovl + = dyn_cast<OverloadedFunctionDecl>(D)) { + for (OverloadedFunctionDecl::function_iterator + Func = Ovl->function_begin(), + FuncEnd = Ovl->function_end(); + Func != FuncEnd; ++Func) { + if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) + if (!DMethod->isStatic()) { + Ctx = Ovl->getDeclContext(); + MemberType = Context.OverloadTy; + break; + } + } + } + + if (Ctx && Ctx->isRecord()) { + QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); + QualType ThisType = Context.getTagDeclType(MD->getParent()); + if ((Context.getCanonicalType(CtxType) + == Context.getCanonicalType(ThisType)) || + IsDerivedFrom(ThisType, CtxType)) { + // Build the implicit member access expression. + Expr *This = new (Context) CXXThisExpr(SourceLocation(), + MD->getThisType(Context)); + return Owned(new (Context) MemberExpr(This, true, D, + Loc, MemberType)); + } + } + } + } + + if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { + if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { + if (MD->isStatic()) + // "invalid use of member 'x' in static member function" + return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) + << FD->getDeclName()); + } + + // Any other ways we could have found the field in a well-formed + // program would have been turned into implicit member expressions + // above. + return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) + << FD->getDeclName()); + } + + if (isa<TypedefDecl>(D)) + return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); + if (isa<ObjCInterfaceDecl>(D)) + return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); + if (isa<NamespaceDecl>(D)) + return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); + + // Make the DeclRefExpr or BlockDeclRefExpr for the decl. + if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) + return Owned(BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, + false, false, SS)); + else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) + return Owned(BuildDeclRefExpr(Template, Context.OverloadTy, Loc, + false, false, SS)); + ValueDecl *VD = cast<ValueDecl>(D); + + // Check whether this declaration can be used. Note that we suppress + // this check when we're going to perform argument-dependent lookup + // on this function name, because this might not be the function + // that overload resolution actually selects. + if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) + return ExprError(); + + if (VarDecl *Var = dyn_cast<VarDecl>(VD)) { + // Warn about constructs like: + // if (void *X = foo()) { ... } else { X }. + // In the else block, the pointer is always false. + + // FIXME: In a template instantiation, we don't have scope + // information to check this property. + if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { + Scope *CheckS = S; + while (CheckS) { + if (CheckS->isWithinElse() && + CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) { + if (Var->getType()->isBooleanType()) + ExprError(Diag(Loc, diag::warn_value_always_false) + << Var->getDeclName()); + else + ExprError(Diag(Loc, diag::warn_value_always_zero) + << Var->getDeclName()); + break; + } + + // Move up one more control parent to check again. + CheckS = CheckS->getControlParent(); + if (CheckS) + CheckS = CheckS->getParent(); + } + } + } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(VD)) { + if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { + // C99 DR 316 says that, if a function type comes from a + // function definition (without a prototype), that type is only + // used for checking compatibility. Therefore, when referencing + // the function, we pretend that we don't have the full function + // type. + QualType T = Func->getType(); + QualType NoProtoType = T; + if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) + NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); + return Owned(BuildDeclRefExpr(VD, NoProtoType, Loc, false, false, SS)); + } + } + + // Only create DeclRefExpr's for valid Decl's. + if (VD->isInvalidDecl()) + return ExprError(); + + // If the identifier reference is inside a block, and it refers to a value + // that is outside the block, create a BlockDeclRefExpr instead of a + // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when + // the block is formed. + // + // We do not do this for things like enum constants, global variables, etc, + // as they do not get snapshotted. + // + if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { + QualType ExprTy = VD->getType().getNonReferenceType(); + // The BlocksAttr indicates the variable is bound by-reference. + if (VD->getAttr<BlocksAttr>()) + return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); + + // Variable will be bound by-copy, make it const within the closure. + ExprTy.addConst(); + return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false)); + } + // If this reference is not in a block or if the referenced variable is + // within the block, create a normal DeclRefExpr. + + bool TypeDependent = false; + bool ValueDependent = false; + if (getLangOptions().CPlusPlus) { + // C++ [temp.dep.expr]p3: + // An id-expression is type-dependent if it contains: + // - an identifier that was declared with a dependent type, + if (VD->getType()->isDependentType()) + TypeDependent = true; + // - FIXME: a template-id that is dependent, + // - a conversion-function-id that specifies a dependent type, + else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && + Name.getCXXNameType()->isDependentType()) + TypeDependent = true; + // - a nested-name-specifier that contains a class-name that + // names a dependent type. + else if (SS && !SS->isEmpty()) { + for (DeclContext *DC = computeDeclContext(*SS); + DC; DC = DC->getParent()) { + // FIXME: could stop early at namespace scope. + if (DC->isRecord()) { + CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); + if (Context.getTypeDeclType(Record)->isDependentType()) { + TypeDependent = true; + break; + } + } + } + } + + // C++ [temp.dep.constexpr]p2: + // + // An identifier is value-dependent if it is: + // - a name declared with a dependent type, + if (TypeDependent) + ValueDependent = true; + // - the name of a non-type template parameter, + else if (isa<NonTypeTemplateParmDecl>(VD)) + ValueDependent = true; + // - a constant with integral or enumeration type and is + // initialized with an expression that is value-dependent + // (FIXME!). + } + + return Owned(BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, + TypeDependent, ValueDependent, SS)); +} + +Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, + tok::TokenKind Kind) { + PredefinedExpr::IdentType IT; + + switch (Kind) { + default: assert(0 && "Unknown simple primary expr!"); + case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] + case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; + case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; + } + + // Pre-defined identifiers are of type char[x], where x is the length of the + // string. + unsigned Length; + if (FunctionDecl *FD = getCurFunctionDecl()) + Length = FD->getIdentifier()->getLength(); + else if (ObjCMethodDecl *MD = getCurMethodDecl()) + Length = MD->getSynthesizedMethodSize(); + else { + Diag(Loc, diag::ext_predef_outside_function); + // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. + Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; + } + + + llvm::APInt LengthI(32, Length + 1); + QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); + ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); + return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); +} + +Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { + llvm::SmallString<16> CharBuffer; + CharBuffer.resize(Tok.getLength()); + const char *ThisTokBegin = &CharBuffer[0]; + unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); + + CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, + Tok.getLocation(), PP); + if (Literal.hadError()) + return ExprError(); + + QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; + + return Owned(new (Context) CharacterLiteral(Literal.getValue(), + Literal.isWide(), + type, Tok.getLocation())); +} + +Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { + // Fast path for a single digit (which is quite common). A single digit + // cannot have a trigraph, escaped newline, radix prefix, or type suffix. + if (Tok.getLength() == 1) { + const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); + unsigned IntSize = Context.Target.getIntWidth(); + return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), + Context.IntTy, Tok.getLocation())); + } + + llvm::SmallString<512> IntegerBuffer; + // Add padding so that NumericLiteralParser can overread by one character. + IntegerBuffer.resize(Tok.getLength()+1); + const char *ThisTokBegin = &IntegerBuffer[0]; + + // Get the spelling of the token, which eliminates trigraphs, etc. + unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); + + NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, + Tok.getLocation(), PP); + if (Literal.hadError) + return ExprError(); + + Expr *Res; + + if (Literal.isFloatingLiteral()) { + QualType Ty; + if (Literal.isFloat) + Ty = Context.FloatTy; + else if (!Literal.isLong) + Ty = Context.DoubleTy; + else + Ty = Context.LongDoubleTy; + + const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); + + // isExact will be set by GetFloatValue(). + bool isExact = false; + Res = new (Context) FloatingLiteral(Literal.GetFloatValue(Format, &isExact), + &isExact, Ty, Tok.getLocation()); + + } else if (!Literal.isIntegerLiteral()) { + return ExprError(); + } else { + QualType Ty; + + // long long is a C99 feature. + if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && + Literal.isLongLong) + Diag(Tok.getLocation(), diag::ext_longlong); + + // Get the value in the widest-possible width. + llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); + + if (Literal.GetIntegerValue(ResultVal)) { + // If this value didn't fit into uintmax_t, warn and force to ull. + Diag(Tok.getLocation(), diag::warn_integer_too_large); + Ty = Context.UnsignedLongLongTy; + assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && + "long long is not intmax_t?"); + } else { + // If this value fits into a ULL, try to figure out what else it fits into + // according to the rules of C99 6.4.4.1p5. + + // Octal, Hexadecimal, and integers with a U suffix are allowed to + // be an unsigned int. + bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; + + // Check from smallest to largest, picking the smallest type we can. + unsigned Width = 0; + if (!Literal.isLong && !Literal.isLongLong) { + // Are int/unsigned possibilities? + unsigned IntSize = Context.Target.getIntWidth(); + + // Does it fit in a unsigned int? + if (ResultVal.isIntN(IntSize)) { + // Does it fit in a signed int? + if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) + Ty = Context.IntTy; + else if (AllowUnsigned) + Ty = Context.UnsignedIntTy; + Width = IntSize; + } + } + + // Are long/unsigned long possibilities? + if (Ty.isNull() && !Literal.isLongLong) { + unsigned LongSize = Context.Target.getLongWidth(); + + // Does it fit in a unsigned long? + if (ResultVal.isIntN(LongSize)) { + // Does it fit in a signed long? + if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) + Ty = Context.LongTy; + else if (AllowUnsigned) + Ty = Context.UnsignedLongTy; + Width = LongSize; + } + } + + // Finally, check long long if needed. + if (Ty.isNull()) { + unsigned LongLongSize = Context.Target.getLongLongWidth(); + + // Does it fit in a unsigned long long? + if (ResultVal.isIntN(LongLongSize)) { + // Does it fit in a signed long long? + if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) + Ty = Context.LongLongTy; + else if (AllowUnsigned) + Ty = Context.UnsignedLongLongTy; + Width = LongLongSize; + } + } + + // If we still couldn't decide a type, we probably have something that + // does not fit in a signed long long, but has no U suffix. + if (Ty.isNull()) { + Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); + Ty = Context.UnsignedLongLongTy; + Width = Context.Target.getLongLongWidth(); + } + + if (ResultVal.getBitWidth() != Width) + ResultVal.trunc(Width); + } + Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); + } + + // If this is an imaginary literal, create the ImaginaryLiteral wrapper. + if (Literal.isImaginary) + Res = new (Context) ImaginaryLiteral(Res, + Context.getComplexType(Res->getType())); + + return Owned(Res); +} + +Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, + SourceLocation R, ExprArg Val) { + Expr *E = Val.takeAs<Expr>(); + assert((E != 0) && "ActOnParenExpr() missing expr"); + return Owned(new (Context) ParenExpr(L, R, E)); +} + +/// The UsualUnaryConversions() function is *not* called by this routine. +/// See C99 6.3.2.1p[2-4] for more details. +bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, + SourceLocation OpLoc, + const SourceRange &ExprRange, + bool isSizeof) { + if (exprType->isDependentType()) + return false; + + // C99 6.5.3.4p1: + if (isa<FunctionType>(exprType)) { + // alignof(function) is allowed as an extension. + if (isSizeof) + Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; + return false; + } + + // Allow sizeof(void)/alignof(void) as an extension. + if (exprType->isVoidType()) { + Diag(OpLoc, diag::ext_sizeof_void_type) + << (isSizeof ? "sizeof" : "__alignof") << ExprRange; + return false; + } + + if (RequireCompleteType(OpLoc, exprType, + isSizeof ? diag::err_sizeof_incomplete_type : + diag::err_alignof_incomplete_type, + ExprRange)) + return true; + + // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode. + if (LangOpts.ObjCNonFragileABI && exprType->isObjCInterfaceType()) { + Diag(OpLoc, diag::err_sizeof_nonfragile_interface) + << exprType << isSizeof << ExprRange; + return true; + } + + return false; +} + +bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, + const SourceRange &ExprRange) { + E = E->IgnoreParens(); + + // alignof decl is always ok. + if (isa<DeclRefExpr>(E)) + return false; + + // Cannot know anything else if the expression is dependent. + if (E->isTypeDependent()) + return false; + + if (E->getBitField()) { + Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; + return true; + } + + // Alignment of a field access is always okay, so long as it isn't a + // bit-field. + if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) + if (dyn_cast<FieldDecl>(ME->getMemberDecl())) + return false; + + return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); +} + +/// \brief Build a sizeof or alignof expression given a type operand. +Action::OwningExprResult +Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, + bool isSizeOf, SourceRange R) { + if (T.isNull()) + return ExprError(); + + if (!T->isDependentType() && + CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) + return ExprError(); + + // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. + return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, + Context.getSizeType(), OpLoc, + R.getEnd())); +} + +/// \brief Build a sizeof or alignof expression given an expression +/// operand. +Action::OwningExprResult +Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, + bool isSizeOf, SourceRange R) { + // Verify that the operand is valid. + bool isInvalid = false; + if (E->isTypeDependent()) { + // Delay type-checking for type-dependent expressions. + } else if (!isSizeOf) { + isInvalid = CheckAlignOfExpr(E, OpLoc, R); + } else if (E->getBitField()) { // C99 6.5.3.4p1. + Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; + isInvalid = true; + } else { + isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); + } + + if (isInvalid) + return ExprError(); + + // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. + return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, + Context.getSizeType(), OpLoc, + R.getEnd())); +} + +/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and +/// the same for @c alignof and @c __alignof +/// Note that the ArgRange is invalid if isType is false. +Action::OwningExprResult +Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, + void *TyOrEx, const SourceRange &ArgRange) { + // If error parsing type, ignore. + if (TyOrEx == 0) return ExprError(); + + if (isType) { + QualType ArgTy = QualType::getFromOpaquePtr(TyOrEx); + return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); + } + + // Get the end location. + Expr *ArgEx = (Expr *)TyOrEx; + Action::OwningExprResult Result + = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); + + if (Result.isInvalid()) + DeleteExpr(ArgEx); + + return move(Result); +} + +QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { + if (V->isTypeDependent()) + return Context.DependentTy; + + // These operators return the element type of a complex type. + if (const ComplexType *CT = V->getType()->getAsComplexType()) + return CT->getElementType(); + + // Otherwise they pass through real integer and floating point types here. + if (V->getType()->isArithmeticType()) + return V->getType(); + + // Reject anything else. + Diag(Loc, diag::err_realimag_invalid_type) << V->getType() + << (isReal ? "__real" : "__imag"); + return QualType(); +} + + + +Action::OwningExprResult +Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, + tok::TokenKind Kind, ExprArg Input) { + Expr *Arg = (Expr *)Input.get(); + + UnaryOperator::Opcode Opc; + switch (Kind) { + default: assert(0 && "Unknown unary op!"); + case tok::plusplus: Opc = UnaryOperator::PostInc; break; + case tok::minusminus: Opc = UnaryOperator::PostDec; break; + } + + if (getLangOptions().CPlusPlus && + (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { + // Which overloaded operator? + OverloadedOperatorKind OverOp = + (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; + + // C++ [over.inc]p1: + // + // [...] If the function is a member function with one + // parameter (which shall be of type int) or a non-member + // function with two parameters (the second of which shall be + // of type int), it defines the postfix increment operator ++ + // for objects of that type. When the postfix increment is + // called as a result of using the ++ operator, the int + // argument will have value zero. + Expr *Args[2] = { + Arg, + new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, + /*isSigned=*/true), Context.IntTy, SourceLocation()) + }; + + // Build the candidate set for overloading + OverloadCandidateSet CandidateSet; + AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); + + // Perform overload resolution. + OverloadCandidateSet::iterator Best; + switch (BestViableFunction(CandidateSet, Best)) { + case OR_Success: { + // We found a built-in operator or an overloaded operator. + FunctionDecl *FnDecl = Best->Function; + + if (FnDecl) { + // We matched an overloaded operator. Build a call to that + // operator. + + // Convert the arguments. + if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { + if (PerformObjectArgumentInitialization(Arg, Method)) + return ExprError(); + } else { + // Convert the arguments. + if (PerformCopyInitialization(Arg, + FnDecl->getParamDecl(0)->getType(), + "passing")) + return ExprError(); + } + + // Determine the result type + QualType ResultTy + = FnDecl->getType()->getAsFunctionType()->getResultType(); + ResultTy = ResultTy.getNonReferenceType(); + + // Build the actual expression node. + Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), + SourceLocation()); + UsualUnaryConversions(FnExpr); + + Input.release(); + Args[0] = Arg; + return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, + Args, 2, ResultTy, + OpLoc)); + } else { + // We matched a built-in operator. Convert the arguments, then + // break out so that we will build the appropriate built-in + // operator node. + if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], + "passing")) + return ExprError(); + + break; + } + } + + case OR_No_Viable_Function: + // No viable function; fall through to handling this as a + // built-in operator, which will produce an error message for us. + break; + + case OR_Ambiguous: + Diag(OpLoc, diag::err_ovl_ambiguous_oper) + << UnaryOperator::getOpcodeStr(Opc) + << Arg->getSourceRange(); + PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); + return ExprError(); + + case OR_Deleted: + Diag(OpLoc, diag::err_ovl_deleted_oper) + << Best->Function->isDeleted() + << UnaryOperator::getOpcodeStr(Opc) + << Arg->getSourceRange(); + PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); + return ExprError(); + } + + // Either we found no viable overloaded operator or we matched a + // built-in operator. In either case, fall through to trying to + // build a built-in operation. + } + + QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, + Opc == UnaryOperator::PostInc); + if (result.isNull()) + return ExprError(); + Input.release(); + return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc)); +} + +Action::OwningExprResult +Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, + ExprArg Idx, SourceLocation RLoc) { + Expr *LHSExp = static_cast<Expr*>(Base.get()), + *RHSExp = static_cast<Expr*>(Idx.get()); + + if (getLangOptions().CPlusPlus && + (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) { + Base.release(); + Idx.release(); + return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, + Context.DependentTy, RLoc)); + } + + if (getLangOptions().CPlusPlus && + (LHSExp->getType()->isRecordType() || + LHSExp->getType()->isEnumeralType() || + RHSExp->getType()->isRecordType() || + RHSExp->getType()->isEnumeralType())) { + // Add the appropriate overloaded operators (C++ [over.match.oper]) + // to the candidate set. + OverloadCandidateSet CandidateSet; + Expr *Args[2] = { LHSExp, RHSExp }; + AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, + SourceRange(LLoc, RLoc)); + + // Perform overload resolution. + OverloadCandidateSet::iterator Best; + switch (BestViableFunction(CandidateSet, Best)) { + case OR_Success: { + // We found a built-in operator or an overloaded operator. + FunctionDecl *FnDecl = Best->Function; + + if (FnDecl) { + // We matched an overloaded operator. Build a call to that + // operator. + + // Convert the arguments. + if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { + if (PerformObjectArgumentInitialization(LHSExp, Method) || + PerformCopyInitialization(RHSExp, + FnDecl->getParamDecl(0)->getType(), + "passing")) + return ExprError(); + } else { + // Convert the arguments. + if (PerformCopyInitialization(LHSExp, + FnDecl->getParamDecl(0)->getType(), + "passing") || + PerformCopyInitialization(RHSExp, + FnDecl->getParamDecl(1)->getType(), + "passing")) + return ExprError(); + } + + // Determine the result type + QualType ResultTy + = FnDecl->getType()->getAsFunctionType()->getResultType(); + ResultTy = ResultTy.getNonReferenceType(); + + // Build the actual expression node. + Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), + SourceLocation()); + UsualUnaryConversions(FnExpr); + + Base.release(); + Idx.release(); + Args[0] = LHSExp; + Args[1] = RHSExp; + return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, + FnExpr, Args, 2, + ResultTy, LLoc)); + } else { + // We matched a built-in operator. Convert the arguments, then + // break out so that we will build the appropriate built-in + // operator node. + if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], + "passing") || + PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], + "passing")) + return ExprError(); + + break; + } + } + + case OR_No_Viable_Function: + // No viable function; fall through to handling this as a + // built-in operator, which will produce an error message for us. + break; + + case OR_Ambiguous: + Diag(LLoc, diag::err_ovl_ambiguous_oper) + << "[]" + << LHSExp->getSourceRange() << RHSExp->getSourceRange(); + PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); + return ExprError(); + + case OR_Deleted: + Diag(LLoc, diag::err_ovl_deleted_oper) + << Best->Function->isDeleted() + << "[]" + << LHSExp->getSourceRange() << RHSExp->getSourceRange(); + PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); + return ExprError(); + } + + // Either we found no viable overloaded operator or we matched a + // built-in operator. In either case, fall through to trying to + // build a built-in operation. + } + + // Perform default conversions. + DefaultFunctionArrayConversion(LHSExp); + DefaultFunctionArrayConversion(RHSExp); + + QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); + + // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent + // to the expression *((e1)+(e2)). This means the array "Base" may actually be + // in the subscript position. As a result, we need to derive the array base + // and index from the expression types. + Expr *BaseExpr, *IndexExpr; + QualType ResultType; + if (LHSTy->isDependentType() || RHSTy->isDependentType()) { + BaseExpr = LHSExp; + IndexExpr = RHSExp; + ResultType = Context.DependentTy; + } else if (const PointerType *PTy = LHSTy->getAsPointerType()) { + BaseExpr = LHSExp; + IndexExpr = RHSExp; + ResultType = PTy->getPointeeType(); + } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { + // Handle the uncommon case of "123[Ptr]". + BaseExpr = RHSExp; + IndexExpr = LHSExp; + ResultType = PTy->getPointeeType(); + } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { + BaseExpr = LHSExp; // vectors: V[123] + IndexExpr = RHSExp; + + // FIXME: need to deal with const... + ResultType = VTy->getElementType(); + } else if (LHSTy->isArrayType()) { + // If we see an array that wasn't promoted by + // DefaultFunctionArrayConversion, it must be an array that + // wasn't promoted because of the C90 rule that doesn't + // allow promoting non-lvalue arrays. Warn, then + // force the promotion here. + Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << + LHSExp->getSourceRange(); + ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy)); + LHSTy = LHSExp->getType(); + + BaseExpr = LHSExp; + IndexExpr = RHSExp; + ResultType = LHSTy->getAsPointerType()->getPointeeType(); + } else if (RHSTy->isArrayType()) { + // Same as previous, except for 123[f().a] case + Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << + RHSExp->getSourceRange(); + ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy)); + RHSTy = RHSExp->getType(); + + BaseExpr = RHSExp; + IndexExpr = LHSExp; + ResultType = RHSTy->getAsPointerType()->getPointeeType(); + } else { + return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value) + << LHSExp->getSourceRange() << RHSExp->getSourceRange()); + } + // C99 6.5.2.1p1 + if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) + return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer) + << IndexExpr->getSourceRange()); + + // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, + // C++ [expr.sub]p1: The type "T" shall be a completely-defined object + // type. Note that Functions are not objects, and that (in C99 parlance) + // incomplete types are not object types. + if (ResultType->isFunctionType()) { + Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) + << ResultType << BaseExpr->getSourceRange(); + return ExprError(); + } + + if (!ResultType->isDependentType() && + RequireCompleteType(LLoc, ResultType, diag::err_subscript_incomplete_type, + BaseExpr->getSourceRange())) + return ExprError(); + + // Diagnose bad cases where we step over interface counts. + if (ResultType->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { + Diag(LLoc, diag::err_subscript_nonfragile_interface) + << ResultType << BaseExpr->getSourceRange(); + return ExprError(); + } + + Base.release(); + Idx.release(); + return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, + ResultType, RLoc)); +} + +QualType Sema:: +CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, + IdentifierInfo &CompName, SourceLocation CompLoc) { + const ExtVectorType *vecType = baseType->getAsExtVectorType(); + + // The vector accessor can't exceed the number of elements. + const char *compStr = CompName.getName(); + + // This flag determines whether or not the component is one of the four + // special names that indicate a subset of exactly half the elements are + // to be selected. + bool HalvingSwizzle = false; + + // This flag determines whether or not CompName has an 's' char prefix, + // indicating that it is a string of hex values to be used as vector indices. + bool HexSwizzle = *compStr == 's'; + + // Check that we've found one of the special components, or that the component + // names must come from the same set. + if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || + !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { + HalvingSwizzle = true; + } else if (vecType->getPointAccessorIdx(*compStr) != -1) { + do + compStr++; + while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); + } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { + do + compStr++; + while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); + } + + if (!HalvingSwizzle && *compStr) { + // We didn't get to the end of the string. This means the component names + // didn't come from the same set *or* we encountered an illegal name. + Diag(OpLoc, diag::err_ext_vector_component_name_illegal) + << std::string(compStr,compStr+1) << SourceRange(CompLoc); + return QualType(); + } + + // Ensure no component accessor exceeds the width of the vector type it + // operates on. + if (!HalvingSwizzle) { + compStr = CompName.getName(); + + if (HexSwizzle) + compStr++; + + while (*compStr) { + if (!vecType->isAccessorWithinNumElements(*compStr++)) { + Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) + << baseType << SourceRange(CompLoc); + return QualType(); + } + } + } + + // If this is a halving swizzle, verify that the base type has an even + // number of elements. + if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { + Diag(OpLoc, diag::err_ext_vector_component_requires_even) + << baseType << SourceRange(CompLoc); + return QualType(); + } + + // The component accessor looks fine - now we need to compute the actual type. + // The vector type is implied by the component accessor. For example, + // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. + // vec4.s0 is a float, vec4.s23 is a vec3, etc. + // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. + unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 + : CompName.getLength(); + if (HexSwizzle) + CompSize--; + + if (CompSize == 1) + return vecType->getElementType(); + + QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); + // Now look up the TypeDefDecl from the vector type. Without this, + // diagostics look bad. We want extended vector types to appear built-in. + for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { + if (ExtVectorDecls[i]->getUnderlyingType() == VT) + return Context.getTypedefType(ExtVectorDecls[i]); + } + return VT; // should never get here (a typedef type should always be found). +} + +static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, + IdentifierInfo &Member, + const Selector &Sel, + ASTContext &Context) { + + if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Context, &Member)) + return PD; + if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Context, Sel)) + return OMD; + + for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), + E = PDecl->protocol_end(); I != E; ++I) { + if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel, + Context)) + return D; + } + return 0; +} + +static Decl *FindGetterNameDecl(const ObjCQualifiedIdType *QIdTy, + IdentifierInfo &Member, + const Selector &Sel, + ASTContext &Context) { + // Check protocols on qualified interfaces. + Decl *GDecl = 0; + for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), + E = QIdTy->qual_end(); I != E; ++I) { + if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, &Member)) { + GDecl = PD; + break; + } + // Also must look for a getter name which uses property syntax. + if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Context, Sel)) { + GDecl = OMD; + break; + } + } + if (!GDecl) { + for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), + E = QIdTy->qual_end(); I != E; ++I) { + // Search in the protocol-qualifier list of current protocol. + GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context); + if (GDecl) + return GDecl; + } + } + return GDecl; +} + +/// FindMethodInNestedImplementations - Look up a method in current and +/// all base class implementations. +/// +ObjCMethodDecl *Sema::FindMethodInNestedImplementations( + const ObjCInterfaceDecl *IFace, + const Selector &Sel) { + ObjCMethodDecl *Method = 0; + if (ObjCImplementationDecl *ImpDecl + = LookupObjCImplementation(IFace->getIdentifier())) + Method = ImpDecl->getInstanceMethod(Context, Sel); + + if (!Method && IFace->getSuperClass()) + return FindMethodInNestedImplementations(IFace->getSuperClass(), Sel); + return Method; +} + +Action::OwningExprResult +Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, + tok::TokenKind OpKind, SourceLocation MemberLoc, + IdentifierInfo &Member, + DeclPtrTy ObjCImpDecl) { + Expr *BaseExpr = Base.takeAs<Expr>(); + assert(BaseExpr && "no record expression"); + + // Perform default conversions. + DefaultFunctionArrayConversion(BaseExpr); + + QualType BaseType = BaseExpr->getType(); + assert(!BaseType.isNull() && "no type for member expression"); + + // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr + // must have pointer type, and the accessed type is the pointee. + if (OpKind == tok::arrow) { + if (BaseType->isDependentType()) + return Owned(new (Context) CXXUnresolvedMemberExpr(Context, + BaseExpr, true, + OpLoc, + DeclarationName(&Member), + MemberLoc)); + else if (const PointerType *PT = BaseType->getAsPointerType()) + BaseType = PT->getPointeeType(); + else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) + return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, + MemberLoc, Member)); + else + return ExprError(Diag(MemberLoc, + diag::err_typecheck_member_reference_arrow) + << BaseType << BaseExpr->getSourceRange()); + } else { + if (BaseType->isDependentType()) { + // Require that the base type isn't a pointer type + // (so we'll report an error for) + // T* t; + // t.f; + // + // In Obj-C++, however, the above expression is valid, since it could be + // accessing the 'f' property if T is an Obj-C interface. The extra check + // allows this, while still reporting an error if T is a struct pointer. + const PointerType *PT = BaseType->getAsPointerType(); + + if (!PT || (getLangOptions().ObjC1 && + !PT->getPointeeType()->isRecordType())) + return Owned(new (Context) CXXUnresolvedMemberExpr(Context, + BaseExpr, false, + OpLoc, + DeclarationName(&Member), + MemberLoc)); + } + } + + // Handle field access to simple records. This also handles access to fields + // of the ObjC 'id' struct. + if (const RecordType *RTy = BaseType->getAsRecordType()) { + RecordDecl *RDecl = RTy->getDecl(); + if (RequireCompleteType(OpLoc, BaseType, + diag::err_typecheck_incomplete_tag, + BaseExpr->getSourceRange())) + return ExprError(); + + // The record definition is complete, now make sure the member is valid. + // FIXME: Qualified name lookup for C++ is a bit more complicated than this. + LookupResult Result + = LookupQualifiedName(RDecl, DeclarationName(&Member), + LookupMemberName, false); + + if (!Result) + return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) + << &Member << BaseExpr->getSourceRange()); + if (Result.isAmbiguous()) { + DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), + MemberLoc, BaseExpr->getSourceRange()); + return ExprError(); + } + + NamedDecl *MemberDecl = Result; + + // If the decl being referenced had an error, return an error for this + // sub-expr without emitting another error, in order to avoid cascading + // error cases. + if (MemberDecl->isInvalidDecl()) + return ExprError(); + + // Check the use of this field + if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) + return ExprError(); + + if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { + // We may have found a field within an anonymous union or struct + // (C++ [class.union]). + if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) + return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, + BaseExpr, OpLoc); + + // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] + // FIXME: Handle address space modifiers + QualType MemberType = FD->getType(); + if (const ReferenceType *Ref = MemberType->getAsReferenceType()) + MemberType = Ref->getPointeeType(); + else { + unsigned combinedQualifiers = + MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); + if (FD->isMutable()) + combinedQualifiers &= ~QualType::Const; + MemberType = MemberType.getQualifiedType(combinedQualifiers); + } + + return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, + MemberLoc, MemberType)); + } + + if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) + return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, + Var, MemberLoc, + Var->getType().getNonReferenceType())); + if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) + return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, + MemberFn, MemberLoc, + MemberFn->getType())); + if (OverloadedFunctionDecl *Ovl + = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) + return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, + MemberLoc, Context.OverloadTy)); + if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) + return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, + Enum, MemberLoc, Enum->getType())); + if (isa<TypeDecl>(MemberDecl)) + return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) + << DeclarationName(&Member) << int(OpKind == tok::arrow)); + + // We found a declaration kind that we didn't expect. This is a + // generic error message that tells the user that she can't refer + // to this member with '.' or '->'. + return ExprError(Diag(MemberLoc, + diag::err_typecheck_member_reference_unknown) + << DeclarationName(&Member) << int(OpKind == tok::arrow)); + } + + // Handle access to Objective-C instance variables, such as "Obj->ivar" and + // (*Obj).ivar. + if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { + ObjCInterfaceDecl *ClassDeclared; + if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(Context, + &Member, + ClassDeclared)) { + // If the decl being referenced had an error, return an error for this + // sub-expr without emitting another error, in order to avoid cascading + // error cases. + if (IV->isInvalidDecl()) + return ExprError(); + + // Check whether we can reference this field. + if (DiagnoseUseOfDecl(IV, MemberLoc)) + return ExprError(); + if (IV->getAccessControl() != ObjCIvarDecl::Public && + IV->getAccessControl() != ObjCIvarDecl::Package) { + ObjCInterfaceDecl *ClassOfMethodDecl = 0; + if (ObjCMethodDecl *MD = getCurMethodDecl()) + ClassOfMethodDecl = MD->getClassInterface(); + else if (ObjCImpDecl && getCurFunctionDecl()) { + // Case of a c-function declared inside an objc implementation. + // FIXME: For a c-style function nested inside an objc implementation + // class, there is no implementation context available, so we pass + // down the context as argument to this routine. Ideally, this context + // need be passed down in the AST node and somehow calculated from the + // AST for a function decl. + Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); + if (ObjCImplementationDecl *IMPD = + dyn_cast<ObjCImplementationDecl>(ImplDecl)) + ClassOfMethodDecl = IMPD->getClassInterface(); + else if (ObjCCategoryImplDecl* CatImplClass = + dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) + ClassOfMethodDecl = CatImplClass->getClassInterface(); + } + + if (IV->getAccessControl() == ObjCIvarDecl::Private) { + if (ClassDeclared != IFTy->getDecl() || + ClassOfMethodDecl != ClassDeclared) + Diag(MemberLoc, diag::error_private_ivar_access) << IV->getDeclName(); + } + // @protected + else if (!IFTy->getDecl()->isSuperClassOf(ClassOfMethodDecl)) + Diag(MemberLoc, diag::error_protected_ivar_access) << IV->getDeclName(); + } + + return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), + MemberLoc, BaseExpr, + OpKind == tok::arrow)); + } + return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) + << IFTy->getDecl()->getDeclName() << &Member + << BaseExpr->getSourceRange()); + } + + // Handle Objective-C property access, which is "Obj.property" where Obj is a + // pointer to a (potentially qualified) interface type. + const PointerType *PTy; + const ObjCInterfaceType *IFTy; + if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && + (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { + ObjCInterfaceDecl *IFace = IFTy->getDecl(); + + // Search for a declared property first. + if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Context, + &Member)) { + // Check whether we can reference this property. + if (DiagnoseUseOfDecl(PD, MemberLoc)) + return ExprError(); + QualType ResTy = PD->getType(); + Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); + ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Context, Sel); + if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc)) + ResTy = Getter->getResultType(); + return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy, + MemberLoc, BaseExpr)); + } + + // Check protocols on qualified interfaces. + for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), + E = IFTy->qual_end(); I != E; ++I) + if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, + &Member)) { + // Check whether we can reference this property. + if (DiagnoseUseOfDecl(PD, MemberLoc)) + return ExprError(); + + return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), + MemberLoc, BaseExpr)); + } + + // If that failed, look for an "implicit" property by seeing if the nullary + // selector is implemented. + + // FIXME: The logic for looking up nullary and unary selectors should be + // shared with the code in ActOnInstanceMessage. + + Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); + ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Context, Sel); + + // If this reference is in an @implementation, check for 'private' methods. + if (!Getter) + Getter = FindMethodInNestedImplementations(IFace, Sel); + + // Look through local category implementations associated with the class. + if (!Getter) { + for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { + if (ObjCCategoryImpls[i]->getClassInterface() == IFace) + Getter = ObjCCategoryImpls[i]->getInstanceMethod(Context, Sel); + } + } + if (Getter) { + // Check if we can reference this property. + if (DiagnoseUseOfDecl(Getter, MemberLoc)) + return ExprError(); + } + // If we found a getter then this may be a valid dot-reference, we + // will look for the matching setter, in case it is needed. + Selector SetterSel = + SelectorTable::constructSetterName(PP.getIdentifierTable(), + PP.getSelectorTable(), &Member); + ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(Context, SetterSel); + if (!Setter) { + // If this reference is in an @implementation, also check for 'private' + // methods. + Setter = FindMethodInNestedImplementations(IFace, SetterSel); + } + // Look through local category implementations associated with the class. + if (!Setter) { + for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { + if (ObjCCategoryImpls[i]->getClassInterface() == IFace) + Setter = ObjCCategoryImpls[i]->getInstanceMethod(Context, SetterSel); + } + } + + if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) + return ExprError(); + + if (Getter || Setter) { + QualType PType; + + if (Getter) + PType = Getter->getResultType(); + else { + for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), + E = Setter->param_end(); PI != E; ++PI) + PType = (*PI)->getType(); + } + // FIXME: we must check that the setter has property type. + return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, + Setter, MemberLoc, BaseExpr)); + } + return ExprError(Diag(MemberLoc, diag::err_property_not_found) + << &Member << BaseType); + } + // Handle properties on qualified "id" protocols. + const ObjCQualifiedIdType *QIdTy; + if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { + // Check protocols on qualified interfaces. + Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); + if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { + if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { + // Check the use of this declaration + if (DiagnoseUseOfDecl(PD, MemberLoc)) + return ExprError(); + + return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), + MemberLoc, BaseExpr)); + } + if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { + // Check the use of this method. + if (DiagnoseUseOfDecl(OMD, MemberLoc)) + return ExprError(); + + return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, + OMD->getResultType(), + OMD, OpLoc, MemberLoc, + NULL, 0)); + } + } + + return ExprError(Diag(MemberLoc, diag::err_property_not_found) + << &Member << BaseType); + } + // Handle properties on ObjC 'Class' types. + if (OpKind == tok::period && (BaseType == Context.getObjCClassType())) { + // Also must look for a getter name which uses property syntax. + Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); + if (ObjCMethodDecl *MD = getCurMethodDecl()) { + ObjCInterfaceDecl *IFace = MD->getClassInterface(); + ObjCMethodDecl *Getter; + // FIXME: need to also look locally in the implementation. + if ((Getter = IFace->lookupClassMethod(Context, Sel))) { + // Check the use of this method. + if (DiagnoseUseOfDecl(Getter, MemberLoc)) + return ExprError(); + } + // If we found a getter then this may be a valid dot-reference, we + // will look for the matching setter, in case it is needed. + Selector SetterSel = + SelectorTable::constructSetterName(PP.getIdentifierTable(), + PP.getSelectorTable(), &Member); + ObjCMethodDecl *Setter = IFace->lookupClassMethod(Context, SetterSel); + if (!Setter) { + // If this reference is in an @implementation, also check for 'private' + // methods. + Setter = FindMethodInNestedImplementations(IFace, SetterSel); + } + // Look through local category implementations associated with the class. + if (!Setter) { + for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { + if (ObjCCategoryImpls[i]->getClassInterface() == IFace) + Setter = ObjCCategoryImpls[i]->getClassMethod(Context, SetterSel); + } + } + + if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) + return ExprError(); + + if (Getter || Setter) { + QualType PType; + + if (Getter) + PType = Getter->getResultType(); + else { + for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), + E = Setter->param_end(); PI != E; ++PI) + PType = (*PI)->getType(); + } + // FIXME: we must check that the setter has property type. + return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, + Setter, MemberLoc, BaseExpr)); + } + return ExprError(Diag(MemberLoc, diag::err_property_not_found) + << &Member << BaseType); + } + } + + // Handle 'field access' to vectors, such as 'V.xx'. + if (BaseType->isExtVectorType()) { + QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); + if (ret.isNull()) + return ExprError(); + return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, + MemberLoc)); + } + + Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) + << BaseType << BaseExpr->getSourceRange(); + + // If the user is trying to apply -> or . to a function or function + // pointer, it's probably because they forgot parentheses to call + // the function. Suggest the addition of those parentheses. + if (BaseType == Context.OverloadTy || + BaseType->isFunctionType() || + (BaseType->isPointerType() && + BaseType->getAsPointerType()->isFunctionType())) { + SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); + Diag(Loc, diag::note_member_reference_needs_call) + << CodeModificationHint::CreateInsertion(Loc, "()"); + } + + return ExprError(); +} + +/// ConvertArgumentsForCall - Converts the arguments specified in +/// Args/NumArgs to the parameter types of the function FDecl with +/// function prototype Proto. Call is the call expression itself, and +/// Fn is the function expression. For a C++ member function, this +/// routine does not attempt to convert the object argument. Returns +/// true if the call is ill-formed. +bool +Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, + FunctionDecl *FDecl, + const FunctionProtoType *Proto, + Expr **Args, unsigned NumArgs, + SourceLocation RParenLoc) { + // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by + // assignment, to the types of the corresponding parameter, ... + unsigned NumArgsInProto = Proto->getNumArgs(); + unsigned NumArgsToCheck = NumArgs; + bool Invalid = false; + + // If too few arguments are available (and we don't have default + // arguments for the remaining parameters), don't make the call. + if (NumArgs < NumArgsInProto) { + if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) + return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) + << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); + // Use default arguments for missing arguments + NumArgsToCheck = NumArgsInProto; + Call->setNumArgs(Context, NumArgsInProto); + } + + // If too many are passed and not variadic, error on the extras and drop + // them. + if (NumArgs > NumArgsInProto) { + if (!Proto->isVariadic()) { + Diag(Args[NumArgsInProto]->getLocStart(), + diag::err_typecheck_call_too_many_args) + << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() + << SourceRange(Args[NumArgsInProto]->getLocStart(), + Args[NumArgs-1]->getLocEnd()); + // This deletes the extra arguments. + Call->setNumArgs(Context, NumArgsInProto); + Invalid = true; + } + NumArgsToCheck = NumArgsInProto; + } + + // Continue to check argument types (even if we have too few/many args). + for (unsigned i = 0; i != NumArgsToCheck; i++) { + QualType ProtoArgType = Proto->getArgType(i); + + Expr *Arg; + if (i < NumArgs) { + Arg = Args[i]; + + if (RequireCompleteType(Arg->getSourceRange().getBegin(), + ProtoArgType, + diag::err_call_incomplete_argument, + Arg->getSourceRange())) + return true; + + // Pass the argument. + if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) + return true; + } else + // We already type-checked the argument, so we know it works. + Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); + QualType ArgType = Arg->getType(); + + Call->setArg(i, Arg); + } + + // If this is a variadic call, handle args passed through "...". + if (Proto->isVariadic()) { + VariadicCallType CallType = VariadicFunction; + if (Fn->getType()->isBlockPointerType()) + CallType = VariadicBlock; // Block + else if (isa<MemberExpr>(Fn)) + CallType = VariadicMethod; + + // Promote the arguments (C99 6.5.2.2p7). + for (unsigned i = NumArgsInProto; i != NumArgs; i++) { + Expr *Arg = Args[i]; + Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); + Call->setArg(i, Arg); + } + } + + return Invalid; +} + +/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. +/// This provides the location of the left/right parens and a list of comma +/// locations. +Action::OwningExprResult +Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, + MultiExprArg args, + SourceLocation *CommaLocs, SourceLocation RParenLoc) { + unsigned NumArgs = args.size(); + Expr *Fn = fn.takeAs<Expr>(); + Expr **Args = reinterpret_cast<Expr**>(args.release()); + assert(Fn && "no function call expression"); + FunctionDecl *FDecl = NULL; + NamedDecl *NDecl = NULL; + DeclarationName UnqualifiedName; + + if (getLangOptions().CPlusPlus) { + // Determine whether this is a dependent call inside a C++ template, + // in which case we won't do any semantic analysis now. + // FIXME: Will need to cache the results of name lookup (including ADL) in + // Fn. + bool Dependent = false; + if (Fn->isTypeDependent()) + Dependent = true; + else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) + Dependent = true; + + if (Dependent) + return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, + Context.DependentTy, RParenLoc)); + + // Determine whether this is a call to an object (C++ [over.call.object]). + if (Fn->getType()->isRecordType()) + return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, + CommaLocs, RParenLoc)); + + // Determine whether this is a call to a member function. + if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) + if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) || + isa<CXXMethodDecl>(MemExpr->getMemberDecl())) + return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, + CommaLocs, RParenLoc)); + } + + // If we're directly calling a function, get the appropriate declaration. + DeclRefExpr *DRExpr = NULL; + Expr *FnExpr = Fn; + bool ADL = true; + while (true) { + if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) + FnExpr = IcExpr->getSubExpr(); + else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { + // Parentheses around a function disable ADL + // (C++0x [basic.lookup.argdep]p1). + ADL = false; + FnExpr = PExpr->getSubExpr(); + } else if (isa<UnaryOperator>(FnExpr) && + cast<UnaryOperator>(FnExpr)->getOpcode() + == UnaryOperator::AddrOf) { + FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); + } else if ((DRExpr = dyn_cast<DeclRefExpr>(FnExpr))) { + // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). + ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); + break; + } else if (UnresolvedFunctionNameExpr *DepName + = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { + UnqualifiedName = DepName->getName(); + break; + } else { + // Any kind of name that does not refer to a declaration (or + // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). + ADL = false; + break; + } + } + + OverloadedFunctionDecl *Ovl = 0; + if (DRExpr) { + FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); + Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); + NDecl = dyn_cast<NamedDecl>(DRExpr->getDecl()); + } + + if (Ovl || (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { + // We don't perform ADL for implicit declarations of builtins. + if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) + ADL = false; + + // We don't perform ADL in C. + if (!getLangOptions().CPlusPlus) + ADL = false; + + if (Ovl || ADL) { + FDecl = ResolveOverloadedCallFn(Fn, DRExpr? DRExpr->getDecl() : 0, + UnqualifiedName, LParenLoc, Args, + NumArgs, CommaLocs, RParenLoc, ADL); + if (!FDecl) + return ExprError(); + + // Update Fn to refer to the actual function selected. + Expr *NewFn = 0; + if (QualifiedDeclRefExpr *QDRExpr + = dyn_cast_or_null<QualifiedDeclRefExpr>(DRExpr)) + NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), + QDRExpr->getLocation(), + false, false, + QDRExpr->getQualifierRange(), + QDRExpr->getQualifier()); + else + NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), + Fn->getSourceRange().getBegin()); + Fn->Destroy(Context); + Fn = NewFn; + } + } + + // Promote the function operand. + UsualUnaryConversions(Fn); + + // Make the call expr early, before semantic checks. This guarantees cleanup + // of arguments and function on error. + ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, + Args, NumArgs, + Context.BoolTy, + RParenLoc)); + + const FunctionType *FuncT; + if (!Fn->getType()->isBlockPointerType()) { + // C99 6.5.2.2p1 - "The expression that denotes the called function shall + // have type pointer to function". + const PointerType *PT = Fn->getType()->getAsPointerType(); + if (PT == 0) + return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) + << Fn->getType() << Fn->getSourceRange()); + FuncT = PT->getPointeeType()->getAsFunctionType(); + } else { // This is a block call. + FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> + getAsFunctionType(); + } + if (FuncT == 0) + return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) + << Fn->getType() << Fn->getSourceRange()); + + // Check for a valid return type + if (!FuncT->getResultType()->isVoidType() && + RequireCompleteType(Fn->getSourceRange().getBegin(), + FuncT->getResultType(), + diag::err_call_incomplete_return, + TheCall->getSourceRange())) + return ExprError(); + + // We know the result type of the call, set it. + TheCall->setType(FuncT->getResultType().getNonReferenceType()); + + if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { + if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, + RParenLoc)) + return ExprError(); + } else { + assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); + + if (FDecl) { + // Check if we have too few/too many template arguments, based + // on our knowledge of the function definition. + const FunctionDecl *Def = 0; + if (FDecl->getBody(Context, Def) && NumArgs != Def->param_size()) { + const FunctionProtoType *Proto = + Def->getType()->getAsFunctionProtoType(); + if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size())) { + Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) + << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); + } + } + } + + // Promote the arguments (C99 6.5.2.2p6). + for (unsigned i = 0; i != NumArgs; i++) { + Expr *Arg = Args[i]; + DefaultArgumentPromotion(Arg); + if (RequireCompleteType(Arg->getSourceRange().getBegin(), + Arg->getType(), + diag::err_call_incomplete_argument, + Arg->getSourceRange())) + return ExprError(); + TheCall->setArg(i, Arg); + } + } + + if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) + if (!Method->isStatic()) + return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) + << Fn->getSourceRange()); + + // Check for sentinels + if (NDecl) + DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs); + // Do special checking on direct calls to functions. + if (FDecl) + return CheckFunctionCall(FDecl, TheCall.take()); + if (NDecl) + return CheckBlockCall(NDecl, TheCall.take()); + + return Owned(TheCall.take()); +} + +Action::OwningExprResult +Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, + SourceLocation RParenLoc, ExprArg InitExpr) { + assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); + QualType literalType = QualType::getFromOpaquePtr(Ty); + // FIXME: put back this assert when initializers are worked out. + //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); + Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); + + if (literalType->isArrayType()) { + if (literalType->isVariableArrayType()) + return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) + << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); + } else if (!literalType->isDependentType() && + RequireCompleteType(LParenLoc, literalType, + diag::err_typecheck_decl_incomplete_type, + SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) + return ExprError(); + + if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, + DeclarationName(), /*FIXME:DirectInit=*/false)) + return ExprError(); + + bool isFileScope = getCurFunctionOrMethodDecl() == 0; + if (isFileScope) { // 6.5.2.5p3 + if (CheckForConstantInitializer(literalExpr, literalType)) + return ExprError(); + } + InitExpr.release(); + return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, + literalExpr, isFileScope)); +} + +Action::OwningExprResult +Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, + SourceLocation RBraceLoc) { + unsigned NumInit = initlist.size(); + Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); + + // Semantic analysis for initializers is done by ActOnDeclarator() and + // CheckInitializer() - it requires knowledge of the object being intialized. + + InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, + RBraceLoc); + E->setType(Context.VoidTy); // FIXME: just a place holder for now. + return Owned(E); +} + +/// CheckCastTypes - Check type constraints for casting between types. +bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { + UsualUnaryConversions(castExpr); + + // C99 6.5.4p2: the cast type needs to be void or scalar and the expression + // type needs to be scalar. + if (castType->isVoidType()) { + // Cast to void allows any expr type. + } else if (castType->isDependentType() || castExpr->isTypeDependent()) { + // We can't check any more until template instantiation time. + } else if (!castType->isScalarType() && !castType->isVectorType()) { + if (Context.getCanonicalType(castType).getUnqualifiedType() == + Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && + (castType->isStructureType() || castType->isUnionType())) { + // GCC struct/union extension: allow cast to self. + // FIXME: Check that the cast destination type is complete. + Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) + << castType << castExpr->getSourceRange(); + } else if (castType->isUnionType()) { + // GCC cast to union extension + RecordDecl *RD = castType->getAsRecordType()->getDecl(); + RecordDecl::field_iterator Field, FieldEnd; + for (Field = RD->field_begin(Context), FieldEnd = RD->field_end(Context); + Field != FieldEnd; ++Field) { + if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == + Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { + Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) + << castExpr->getSourceRange(); + break; + } + } + if (Field == FieldEnd) + return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) + << castExpr->getType() << castExpr->getSourceRange(); + } else { + // Reject any other conversions to non-scalar types. + return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) + << castType << castExpr->getSourceRange(); + } + } else if (!castExpr->getType()->isScalarType() && + !castExpr->getType()->isVectorType()) { + return Diag(castExpr->getLocStart(), + diag::err_typecheck_expect_scalar_operand) + << castExpr->getType() << castExpr->getSourceRange(); + } else if (castExpr->getType()->isVectorType()) { + if (CheckVectorCast(TyR, castExpr->getType(), castType)) + return true; + } else if (castType->isVectorType()) { + if (CheckVectorCast(TyR, castType, castExpr->getType())) + return true; + } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { + return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; + } else if (!castType->isArithmeticType()) { + QualType castExprType = castExpr->getType(); + if (!castExprType->isIntegralType() && castExprType->isArithmeticType()) + return Diag(castExpr->getLocStart(), + diag::err_cast_pointer_from_non_pointer_int) + << castExprType << castExpr->getSourceRange(); + } else if (!castExpr->getType()->isArithmeticType()) { + if (!castType->isIntegralType() && castType->isArithmeticType()) + return Diag(castExpr->getLocStart(), + diag::err_cast_pointer_to_non_pointer_int) + << castType << castExpr->getSourceRange(); + } + if (isa<ObjCSelectorExpr>(castExpr)) + return Diag(castExpr->getLocStart(), diag::err_cast_selector_expr); + return false; +} + +bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { + assert(VectorTy->isVectorType() && "Not a vector type!"); + + if (Ty->isVectorType() || Ty->isIntegerType()) { + if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) + return Diag(R.getBegin(), + Ty->isVectorType() ? + diag::err_invalid_conversion_between_vectors : + diag::err_invalid_conversion_between_vector_and_integer) + << VectorTy << Ty << R; + } else + return Diag(R.getBegin(), + diag::err_invalid_conversion_between_vector_and_scalar) + << VectorTy << Ty << R; + + return false; +} + +Action::OwningExprResult +Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, + SourceLocation RParenLoc, ExprArg Op) { + assert((Ty != 0) && (Op.get() != 0) && + "ActOnCastExpr(): missing type or expr"); + + Expr *castExpr = Op.takeAs<Expr>(); + QualType castType = QualType::getFromOpaquePtr(Ty); + + if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) + return ExprError(); + return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType, + LParenLoc, RParenLoc)); +} + +/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. +/// In that case, lhs = cond. +/// C99 6.5.15 +QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, + SourceLocation QuestionLoc) { + // C++ is sufficiently different to merit its own checker. + if (getLangOptions().CPlusPlus) + return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); + + UsualUnaryConversions(Cond); + UsualUnaryConversions(LHS); + UsualUnaryConversions(RHS); + QualType CondTy = Cond->getType(); + QualType LHSTy = LHS->getType(); + QualType RHSTy = RHS->getType(); + + // first, check the condition. + if (!CondTy->isScalarType()) { // C99 6.5.15p2 + Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) + << CondTy; + return QualType(); + } + + // Now check the two expressions. + + // If both operands have arithmetic type, do the usual arithmetic conversions + // to find a common type: C99 6.5.15p3,5. + if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { + UsualArithmeticConversions(LHS, RHS); + return LHS->getType(); + } + + // If both operands are the same structure or union type, the result is that + // type. + if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3 + if (const RecordType *RHSRT = RHSTy->getAsRecordType()) + if (LHSRT->getDecl() == RHSRT->getDecl()) + // "If both the operands have structure or union type, the result has + // that type." This implies that CV qualifiers are dropped. + return LHSTy.getUnqualifiedType(); + // FIXME: Type of conditional expression must be complete in C mode. + } + + // C99 6.5.15p5: "If both operands have void type, the result has void type." + // The following || allows only one side to be void (a GCC-ism). + if (LHSTy->isVoidType() || RHSTy->isVoidType()) { + if (!LHSTy->isVoidType()) + Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) + << RHS->getSourceRange(); + if (!RHSTy->isVoidType()) + Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) + << LHS->getSourceRange(); + ImpCastExprToType(LHS, Context.VoidTy); + ImpCastExprToType(RHS, Context.VoidTy); + return Context.VoidTy; + } + // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has + // the type of the other operand." + if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() || + Context.isObjCObjectPointerType(LHSTy)) && + RHS->isNullPointerConstant(Context)) { + ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. + return LHSTy; + } + if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() || + Context.isObjCObjectPointerType(RHSTy)) && + LHS->isNullPointerConstant(Context)) { + ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. + return RHSTy; + } + + const PointerType *LHSPT = LHSTy->getAsPointerType(); + const PointerType *RHSPT = RHSTy->getAsPointerType(); + const BlockPointerType *LHSBPT = LHSTy->getAsBlockPointerType(); + const BlockPointerType *RHSBPT = RHSTy->getAsBlockPointerType(); + + // Handle the case where both operands are pointers before we handle null + // pointer constants in case both operands are null pointer constants. + if ((LHSPT || LHSBPT) && (RHSPT || RHSBPT)) { // C99 6.5.15p3,6 + // get the "pointed to" types + QualType lhptee = (LHSPT ? LHSPT->getPointeeType() + : LHSBPT->getPointeeType()); + QualType rhptee = (RHSPT ? RHSPT->getPointeeType() + : RHSBPT->getPointeeType()); + + // ignore qualifiers on void (C99 6.5.15p3, clause 6) + if (lhptee->isVoidType() + && (RHSBPT || rhptee->isIncompleteOrObjectType())) { + // Figure out necessary qualifiers (C99 6.5.15p6) + QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); + QualType destType = Context.getPointerType(destPointee); + ImpCastExprToType(LHS, destType); // add qualifiers if necessary + ImpCastExprToType(RHS, destType); // promote to void* + return destType; + } + if (rhptee->isVoidType() + && (LHSBPT || lhptee->isIncompleteOrObjectType())) { + QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); + QualType destType = Context.getPointerType(destPointee); + ImpCastExprToType(LHS, destType); // add qualifiers if necessary + ImpCastExprToType(RHS, destType); // promote to void* + return destType; + } + + bool sameKind = (LHSPT && RHSPT) || (LHSBPT && RHSBPT); + if (sameKind + && Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { + // Two identical pointer types are always compatible. + return LHSTy; + } + + QualType compositeType = LHSTy; + + // If either type is an Objective-C object type then check + // compatibility according to Objective-C. + if (Context.isObjCObjectPointerType(LHSTy) || + Context.isObjCObjectPointerType(RHSTy)) { + // If both operands are interfaces and either operand can be + // assigned to the other, use that type as the composite + // type. This allows + // xxx ? (A*) a : (B*) b + // where B is a subclass of A. + // + // Additionally, as for assignment, if either type is 'id' + // allow silent coercion. Finally, if the types are + // incompatible then make sure to use 'id' as the composite + // type so the result is acceptable for sending messages to. + + // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. + // It could return the composite type. + const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); + const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); + if (LHSIface && RHSIface && + Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { + compositeType = LHSTy; + } else if (LHSIface && RHSIface && + Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { + compositeType = RHSTy; + } else if (Context.isObjCIdStructType(lhptee) || + Context.isObjCIdStructType(rhptee)) { + compositeType = Context.getObjCIdType(); + } else if (LHSBPT || RHSBPT) { + if (!sameKind + || !Context.typesAreBlockCompatible(lhptee.getUnqualifiedType(), + rhptee.getUnqualifiedType())) + Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) + << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); + return QualType(); + } else { + Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands) + << LHSTy << RHSTy + << LHS->getSourceRange() << RHS->getSourceRange(); + QualType incompatTy = Context.getObjCIdType(); + ImpCastExprToType(LHS, incompatTy); + ImpCastExprToType(RHS, incompatTy); + return incompatTy; + } + } else if (!sameKind + || !Context.typesAreCompatible(lhptee.getUnqualifiedType(), + rhptee.getUnqualifiedType())) { + Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) + << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); + // In this situation, we assume void* type. No especially good + // reason, but this is what gcc does, and we do have to pick + // to get a consistent AST. + QualType incompatTy = Context.getPointerType(Context.VoidTy); + ImpCastExprToType(LHS, incompatTy); + ImpCastExprToType(RHS, incompatTy); + return incompatTy; + } + // The pointer types are compatible. + // C99 6.5.15p6: If both operands are pointers to compatible types *or* to + // differently qualified versions of compatible types, the result type is + // a pointer to an appropriately qualified version of the *composite* + // type. + // FIXME: Need to calculate the composite type. + // FIXME: Need to add qualifiers + ImpCastExprToType(LHS, compositeType); + ImpCastExprToType(RHS, compositeType); + return compositeType; + } + + // GCC compatibility: soften pointer/integer mismatch. + if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { + Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) + << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); + ImpCastExprToType(LHS, RHSTy); // promote the integer to a pointer. + return RHSTy; + } + if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { + Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) + << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); + ImpCastExprToType(RHS, LHSTy); // promote the integer to a pointer. + return LHSTy; + } + + // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type + // evaluates to "struct objc_object *" (and is handled above when comparing + // id with statically typed objects). + if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) { + // GCC allows qualified id and any Objective-C type to devolve to + // id. Currently localizing to here until clear this should be + // part of ObjCQualifiedIdTypesAreCompatible. + if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) || + (LHSTy->isObjCQualifiedIdType() && + Context.isObjCObjectPointerType(RHSTy)) || + (RHSTy->isObjCQualifiedIdType() && + Context.isObjCObjectPointerType(LHSTy))) { + // FIXME: This is not the correct composite type. This only happens to + // work because id can more or less be used anywhere, however this may + // change the type of method sends. + + // FIXME: gcc adds some type-checking of the arguments and emits + // (confusing) incompatible comparison warnings in some + // cases. Investigate. + QualType compositeType = Context.getObjCIdType(); + ImpCastExprToType(LHS, compositeType); + ImpCastExprToType(RHS, compositeType); + return compositeType; + } + } + + // Otherwise, the operands are not compatible. + Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) + << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); + return QualType(); +} + +/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null +/// in the case of a the GNU conditional expr extension. +Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, + SourceLocation ColonLoc, + ExprArg Cond, ExprArg LHS, + ExprArg RHS) { + Expr *CondExpr = (Expr *) Cond.get(); + Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); + + // If this is the gnu "x ?: y" extension, analyze the types as though the LHS + // was the condition. + bool isLHSNull = LHSExpr == 0; + if (isLHSNull) + LHSExpr = CondExpr; + + QualType result = CheckConditionalOperands(CondExpr, LHSExpr, + RHSExpr, QuestionLoc); + if (result.isNull()) + return ExprError(); + + Cond.release(); + LHS.release(); + RHS.release(); + return Owned(new (Context) ConditionalOperator(CondExpr, + isLHSNull ? 0 : LHSExpr, + RHSExpr, result)); +} + + +// CheckPointerTypesForAssignment - This is a very tricky routine (despite +// being closely modeled after the C99 spec:-). The odd characteristic of this +// routine is it effectively iqnores the qualifiers on the top level pointee. +// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. +// FIXME: add a couple examples in this comment. +Sema::AssignConvertType +Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { + QualType lhptee, rhptee; + + // get the "pointed to" type (ignoring qualifiers at the top level) + lhptee = lhsType->getAsPointerType()->getPointeeType(); + rhptee = rhsType->getAsPointerType()->getPointeeType(); + + // make sure we operate on the canonical type + lhptee = Context.getCanonicalType(lhptee); + rhptee = Context.getCanonicalType(rhptee); + + AssignConvertType ConvTy = Compatible; + + // C99 6.5.16.1p1: This following citation is common to constraints + // 3 & 4 (below). ...and the type *pointed to* by the left has all the + // qualifiers of the type *pointed to* by the right; + // FIXME: Handle ExtQualType + if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) + ConvTy = CompatiblePointerDiscardsQualifiers; + + // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or + // incomplete type and the other is a pointer to a qualified or unqualified + // version of void... + if (lhptee->isVoidType()) { + if (rhptee->isIncompleteOrObjectType()) + return ConvTy; + + // As an extension, we allow cast to/from void* to function pointer. + assert(rhptee->isFunctionType()); + return FunctionVoidPointer; + } + + if (rhptee->isVoidType()) { + if (lhptee->isIncompleteOrObjectType()) + return ConvTy; + + // As an extension, we allow cast to/from void* to function pointer. + assert(lhptee->isFunctionType()); + return FunctionVoidPointer; + } + // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or + // unqualified versions of compatible types, ... + lhptee = lhptee.getUnqualifiedType(); + rhptee = rhptee.getUnqualifiedType(); + if (!Context.typesAreCompatible(lhptee, rhptee)) { + // Check if the pointee types are compatible ignoring the sign. + // We explicitly check for char so that we catch "char" vs + // "unsigned char" on systems where "char" is unsigned. + if (lhptee->isCharType()) { + lhptee = Context.UnsignedCharTy; + } else if (lhptee->isSignedIntegerType()) { + lhptee = Context.getCorrespondingUnsignedType(lhptee); + } + if (rhptee->isCharType()) { + rhptee = Context.UnsignedCharTy; + } else if (rhptee->isSignedIntegerType()) { + rhptee = Context.getCorrespondingUnsignedType(rhptee); + } + if (lhptee == rhptee) { + // Types are compatible ignoring the sign. Qualifier incompatibility + // takes priority over sign incompatibility because the sign + // warning can be disabled. + if (ConvTy != Compatible) + return ConvTy; + return IncompatiblePointerSign; + } + // General pointer incompatibility takes priority over qualifiers. + return IncompatiblePointer; + } + return ConvTy; +} + +/// CheckBlockPointerTypesForAssignment - This routine determines whether two +/// block pointer types are compatible or whether a block and normal pointer +/// are compatible. It is more restrict than comparing two function pointer +// types. +Sema::AssignConvertType +Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, + QualType rhsType) { + QualType lhptee, rhptee; + + // get the "pointed to" type (ignoring qualifiers at the top level) + lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); + rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); + + // make sure we operate on the canonical type + lhptee = Context.getCanonicalType(lhptee); + rhptee = Context.getCanonicalType(rhptee); + + AssignConvertType ConvTy = Compatible; + + // For blocks we enforce that qualifiers are identical. + if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) + ConvTy = CompatiblePointerDiscardsQualifiers; + + if (!Context.typesAreBlockCompatible(lhptee, rhptee)) + return IncompatibleBlockPointer; + return ConvTy; +} + +/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently +/// has code to accommodate several GCC extensions when type checking +/// pointers. Here are some objectionable examples that GCC considers warnings: +/// +/// int a, *pint; +/// short *pshort; +/// struct foo *pfoo; +/// +/// pint = pshort; // warning: assignment from incompatible pointer type +/// a = pint; // warning: assignment makes integer from pointer without a cast +/// pint = a; // warning: assignment makes pointer from integer without a cast +/// pint = pfoo; // warning: assignment from incompatible pointer type +/// +/// As a result, the code for dealing with pointers is more complex than the +/// C99 spec dictates. +/// +Sema::AssignConvertType +Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { + // Get canonical types. We're not formatting these types, just comparing + // them. + lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); + rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); + + if (lhsType == rhsType) + return Compatible; // Common case: fast path an exact match. + + // If the left-hand side is a reference type, then we are in a + // (rare!) case where we've allowed the use of references in C, + // e.g., as a parameter type in a built-in function. In this case, + // just make sure that the type referenced is compatible with the + // right-hand side type. The caller is responsible for adjusting + // lhsType so that the resulting expression does not have reference + // type. + if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { + if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) + return Compatible; + return Incompatible; + } + + if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { + if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) + return Compatible; + // Relax integer conversions like we do for pointers below. + if (rhsType->isIntegerType()) + return IntToPointer; + if (lhsType->isIntegerType()) + return PointerToInt; + return IncompatibleObjCQualifiedId; + } + + if (lhsType->isVectorType() || rhsType->isVectorType()) { + // For ExtVector, allow vector splats; float -> <n x float> + if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) + if (LV->getElementType() == rhsType) + return Compatible; + + // If we are allowing lax vector conversions, and LHS and RHS are both + // vectors, the total size only needs to be the same. This is a bitcast; + // no bits are changed but the result type is different. + if (getLangOptions().LaxVectorConversions && + lhsType->isVectorType() && rhsType->isVectorType()) { + if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) + return IncompatibleVectors; + } + return Incompatible; + } + + if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) + return Compatible; + + if (isa<PointerType>(lhsType)) { + if (rhsType->isIntegerType()) + return IntToPointer; + + if (isa<PointerType>(rhsType)) + return CheckPointerTypesForAssignment(lhsType, rhsType); + + if (rhsType->getAsBlockPointerType()) { + if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) + return Compatible; + + // Treat block pointers as objects. + if (getLangOptions().ObjC1 && + lhsType == Context.getCanonicalType(Context.getObjCIdType())) + return Compatible; + } + return Incompatible; + } + + if (isa<BlockPointerType>(lhsType)) { + if (rhsType->isIntegerType()) + return IntToBlockPointer; + + // Treat block pointers as objects. + if (getLangOptions().ObjC1 && + rhsType == Context.getCanonicalType(Context.getObjCIdType())) + return Compatible; + + if (rhsType->isBlockPointerType()) + return CheckBlockPointerTypesForAssignment(lhsType, rhsType); + + if (const PointerType *RHSPT = rhsType->getAsPointerType()) { + if (RHSPT->getPointeeType()->isVoidType()) + return Compatible; + } + return Incompatible; + } + + if (isa<PointerType>(rhsType)) { + // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. + if (lhsType == Context.BoolTy) + return Compatible; + + if (lhsType->isIntegerType()) + return PointerToInt; + + if (isa<PointerType>(lhsType)) + return CheckPointerTypesForAssignment(lhsType, rhsType); + + if (isa<BlockPointerType>(lhsType) && + rhsType->getAsPointerType()->getPointeeType()->isVoidType()) + return Compatible; + return Incompatible; + } + + if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { + if (Context.typesAreCompatible(lhsType, rhsType)) + return Compatible; + } + return Incompatible; +} + +/// \brief Constructs a transparent union from an expression that is +/// used to initialize the transparent union. +static void ConstructTransparentUnion(ASTContext &C, Expr *&E, + QualType UnionType, FieldDecl *Field) { + // Build an initializer list that designates the appropriate member + // of the transparent union. + InitListExpr *Initializer = new (C) InitListExpr(SourceLocation(), + &E, 1, + SourceLocation()); + Initializer->setType(UnionType); + Initializer->setInitializedFieldInUnion(Field); + + // Build a compound literal constructing a value of the transparent + // union type from this initializer list. + E = new (C) CompoundLiteralExpr(SourceLocation(), UnionType, Initializer, + false); +} + +Sema::AssignConvertType +Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) { + QualType FromType = rExpr->getType(); + + // If the ArgType is a Union type, we want to handle a potential + // transparent_union GCC extension. + const RecordType *UT = ArgType->getAsUnionType(); + if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>()) + return Incompatible; + + // The field to initialize within the transparent union. + RecordDecl *UD = UT->getDecl(); + FieldDecl *InitField = 0; + // It's compatible if the expression matches any of the fields. + for (RecordDecl::field_iterator it = UD->field_begin(Context), + itend = UD->field_end(Context); + it != itend; ++it) { + if (it->getType()->isPointerType()) { + // If the transparent union contains a pointer type, we allow: + // 1) void pointer + // 2) null pointer constant + if (FromType->isPointerType()) + if (FromType->getAsPointerType()->getPointeeType()->isVoidType()) { + ImpCastExprToType(rExpr, it->getType()); + InitField = *it; + break; + } + + if (rExpr->isNullPointerConstant(Context)) { + ImpCastExprToType(rExpr, it->getType()); + InitField = *it; + break; + } + } + + if (CheckAssignmentConstraints(it->getType(), rExpr->getType()) + == Compatible) { + InitField = *it; + break; + } + } + + if (!InitField) + return Incompatible; + + ConstructTransparentUnion(Context, rExpr, ArgType, InitField); + return Compatible; +} + +Sema::AssignConvertType +Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { + if (getLangOptions().CPlusPlus) { + if (!lhsType->isRecordType()) { + // C++ 5.17p3: If the left operand is not of class type, the + // expression is implicitly converted (C++ 4) to the + // cv-unqualified type of the left operand. + if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), + "assigning")) + return Incompatible; + return Compatible; + } + + // FIXME: Currently, we fall through and treat C++ classes like C + // structures. + } + + // C99 6.5.16.1p1: the left operand is a pointer and the right is + // a null pointer constant. + if ((lhsType->isPointerType() || + lhsType->isObjCQualifiedIdType() || + lhsType->isBlockPointerType()) + && rExpr->isNullPointerConstant(Context)) { + ImpCastExprToType(rExpr, lhsType); + return Compatible; + } + + // This check seems unnatural, however it is necessary to ensure the proper + // conversion of functions/arrays. If the conversion were done for all + // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary + // expressions that surpress this implicit conversion (&, sizeof). + // + // Suppress this for references: C++ 8.5.3p5. + if (!lhsType->isReferenceType()) + DefaultFunctionArrayConversion(rExpr); + + Sema::AssignConvertType result = + CheckAssignmentConstraints(lhsType, rExpr->getType()); + + // C99 6.5.16.1p2: The value of the right operand is converted to the + // type of the assignment expression. + // CheckAssignmentConstraints allows the left-hand side to be a reference, + // so that we can use references in built-in functions even in C. + // The getNonReferenceType() call makes sure that the resulting expression + // does not have reference type. + if (result != Incompatible && rExpr->getType() != lhsType) + ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); + return result; +} + +QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { + Diag(Loc, diag::err_typecheck_invalid_operands) + << lex->getType() << rex->getType() + << lex->getSourceRange() << rex->getSourceRange(); + return QualType(); +} + +inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, + Expr *&rex) { + // For conversion purposes, we ignore any qualifiers. + // For example, "const float" and "float" are equivalent. + QualType lhsType = + Context.getCanonicalType(lex->getType()).getUnqualifiedType(); + QualType rhsType = + Context.getCanonicalType(rex->getType()).getUnqualifiedType(); + + // If the vector types are identical, return. + if (lhsType == rhsType) + return lhsType; + + // Handle the case of a vector & extvector type of the same size and element + // type. It would be nice if we only had one vector type someday. + if (getLangOptions().LaxVectorConversions) { + // FIXME: Should we warn here? + if (const VectorType *LV = lhsType->getAsVectorType()) { + if (const VectorType *RV = rhsType->getAsVectorType()) + if (LV->getElementType() == RV->getElementType() && + LV->getNumElements() == RV->getNumElements()) { + return lhsType->isExtVectorType() ? lhsType : rhsType; + } + } + } + + // If the lhs is an extended vector and the rhs is a scalar of the same type + // or a literal, promote the rhs to the vector type. + if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { + QualType eltType = V->getElementType(); + + if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || + (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || + (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { + ImpCastExprToType(rex, lhsType); + return lhsType; + } + } + + // If the rhs is an extended vector and the lhs is a scalar of the same type, + // promote the lhs to the vector type. + if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { + QualType eltType = V->getElementType(); + + if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || + (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || + (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { + ImpCastExprToType(lex, rhsType); + return rhsType; + } + } + + // You cannot convert between vector values of different size. + Diag(Loc, diag::err_typecheck_vector_not_convertable) + << lex->getType() << rex->getType() + << lex->getSourceRange() << rex->getSourceRange(); + return QualType(); +} + +inline QualType Sema::CheckMultiplyDivideOperands( + Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) +{ + if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) + return CheckVectorOperands(Loc, lex, rex); + + QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); + + if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) + return compType; + return InvalidOperands(Loc, lex, rex); +} + +inline QualType Sema::CheckRemainderOperands( + Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) +{ + if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { + if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) + return CheckVectorOperands(Loc, lex, rex); + return InvalidOperands(Loc, lex, rex); + } + + QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); + + if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) + return compType; + return InvalidOperands(Loc, lex, rex); +} + +inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 + Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) +{ + if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { + QualType compType = CheckVectorOperands(Loc, lex, rex); + if (CompLHSTy) *CompLHSTy = compType; + return compType; + } + + QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); + + // handle the common case first (both operands are arithmetic). + if (lex->getType()->isArithmeticType() && + rex->getType()->isArithmeticType()) { + if (CompLHSTy) *CompLHSTy = compType; + return compType; + } + + // Put any potential pointer into PExp + Expr* PExp = lex, *IExp = rex; + if (IExp->getType()->isPointerType()) + std::swap(PExp, IExp); + + if (const PointerType *PTy = PExp->getType()->getAsPointerType()) { + if (IExp->getType()->isIntegerType()) { + QualType PointeeTy = PTy->getPointeeType(); + // Check for arithmetic on pointers to incomplete types. + if (PointeeTy->isVoidType()) { + if (getLangOptions().CPlusPlus) { + Diag(Loc, diag::err_typecheck_pointer_arith_void_type) + << lex->getSourceRange() << rex->getSourceRange(); + return QualType(); + } + + // GNU extension: arithmetic on pointer to void + Diag(Loc, diag::ext_gnu_void_ptr) + << lex->getSourceRange() << rex->getSourceRange(); + } else if (PointeeTy->isFunctionType()) { + if (getLangOptions().CPlusPlus) { + Diag(Loc, diag::err_typecheck_pointer_arith_function_type) + << lex->getType() << lex->getSourceRange(); + return QualType(); + } + + // GNU extension: arithmetic on pointer to function + Diag(Loc, diag::ext_gnu_ptr_func_arith) + << lex->getType() << lex->getSourceRange(); + } else if (!PTy->isDependentType() && + RequireCompleteType(Loc, PointeeTy, + diag::err_typecheck_arithmetic_incomplete_type, + PExp->getSourceRange(), SourceRange(), + PExp->getType())) + return QualType(); + + // Diagnose bad cases where we step over interface counts. + if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { + Diag(Loc, diag::err_arithmetic_nonfragile_interface) + << PointeeTy << PExp->getSourceRange(); + return QualType(); + } + + if (CompLHSTy) { + QualType LHSTy = lex->getType(); + if (LHSTy->isPromotableIntegerType()) + LHSTy = Context.IntTy; + else { + QualType T = isPromotableBitField(lex, Context); + if (!T.isNull()) + LHSTy = T; + } + + *CompLHSTy = LHSTy; + } + return PExp->getType(); + } + } + + return InvalidOperands(Loc, lex, rex); +} + +// C99 6.5.6 +QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, + SourceLocation Loc, QualType* CompLHSTy) { + if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { + QualType compType = CheckVectorOperands(Loc, lex, rex); + if (CompLHSTy) *CompLHSTy = compType; + return compType; + } + + QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); + + // Enforce type constraints: C99 6.5.6p3. + + // Handle the common case first (both operands are arithmetic). + if (lex->getType()->isArithmeticType() + && rex->getType()->isArithmeticType()) { + if (CompLHSTy) *CompLHSTy = compType; + return compType; + } + + // Either ptr - int or ptr - ptr. + if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { + QualType lpointee = LHSPTy->getPointeeType(); + + // The LHS must be an completely-defined object type. + + bool ComplainAboutVoid = false; + Expr *ComplainAboutFunc = 0; + if (lpointee->isVoidType()) { + if (getLangOptions().CPlusPlus) { + Diag(Loc, diag::err_typecheck_pointer_arith_void_type) + << lex->getSourceRange() << rex->getSourceRange(); + return QualType(); + } + + // GNU C extension: arithmetic on pointer to void + ComplainAboutVoid = true; + } else if (lpointee->isFunctionType()) { + if (getLangOptions().CPlusPlus) { + Diag(Loc, diag::err_typecheck_pointer_arith_function_type) + << lex->getType() << lex->getSourceRange(); + return QualType(); + } + + // GNU C extension: arithmetic on pointer to function + ComplainAboutFunc = lex; + } else if (!lpointee->isDependentType() && + RequireCompleteType(Loc, lpointee, + diag::err_typecheck_sub_ptr_object, + lex->getSourceRange(), + SourceRange(), + lex->getType())) + return QualType(); + + // Diagnose bad cases where we step over interface counts. + if (lpointee->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { + Diag(Loc, diag::err_arithmetic_nonfragile_interface) + << lpointee << lex->getSourceRange(); + return QualType(); + } + + // The result type of a pointer-int computation is the pointer type. + if (rex->getType()->isIntegerType()) { + if (ComplainAboutVoid) + Diag(Loc, diag::ext_gnu_void_ptr) + << lex->getSourceRange() << rex->getSourceRange(); + if (ComplainAboutFunc) + Diag(Loc, diag::ext_gnu_ptr_func_arith) + << ComplainAboutFunc->getType() + << ComplainAboutFunc->getSourceRange(); + + if (CompLHSTy) *CompLHSTy = lex->getType(); + return lex->getType(); + } + + // Handle pointer-pointer subtractions. + if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { + QualType rpointee = RHSPTy->getPointeeType(); + + // RHS must be a completely-type object type. + // Handle the GNU void* extension. + if (rpointee->isVoidType()) { + if (getLangOptions().CPlusPlus) { + Diag(Loc, diag::err_typecheck_pointer_arith_void_type) + << lex->getSourceRange() << rex->getSourceRange(); + return QualType(); + } + + ComplainAboutVoid = true; + } else if (rpointee->isFunctionType()) { + if (getLangOptions().CPlusPlus) { + Diag(Loc, diag::err_typecheck_pointer_arith_function_type) + << rex->getType() << rex->getSourceRange(); + return QualType(); + } + + // GNU extension: arithmetic on pointer to function + if (!ComplainAboutFunc) + ComplainAboutFunc = rex; + } else if (!rpointee->isDependentType() && + RequireCompleteType(Loc, rpointee, + diag::err_typecheck_sub_ptr_object, + rex->getSourceRange(), + SourceRange(), + rex->getType())) + return QualType(); + + if (getLangOptions().CPlusPlus) { + // Pointee types must be the same: C++ [expr.add] + if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) { + Diag(Loc, diag::err_typecheck_sub_ptr_compatible) + << lex->getType() << rex->getType() + << lex->getSourceRange() << rex->getSourceRange(); + return QualType(); + } + } else { + // Pointee types must be compatible C99 6.5.6p3 + if (!Context.typesAreCompatible( + Context.getCanonicalType(lpointee).getUnqualifiedType(), + Context.getCanonicalType(rpointee).getUnqualifiedType())) { + Diag(Loc, diag::err_typecheck_sub_ptr_compatible) + << lex->getType() << rex->getType() + << lex->getSourceRange() << rex->getSourceRange(); + return QualType(); + } + } + + if (ComplainAboutVoid) + Diag(Loc, diag::ext_gnu_void_ptr) + << lex->getSourceRange() << rex->getSourceRange(); + if (ComplainAboutFunc) + Diag(Loc, diag::ext_gnu_ptr_func_arith) + << ComplainAboutFunc->getType() + << ComplainAboutFunc->getSourceRange(); + + if (CompLHSTy) *CompLHSTy = lex->getType(); + return Context.getPointerDiffType(); + } + } + + return InvalidOperands(Loc, lex, rex); +} + +// C99 6.5.7 +QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, + bool isCompAssign) { + // C99 6.5.7p2: Each of the operands shall have integer type. + if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) + return InvalidOperands(Loc, lex, rex); + + // Shifts don't perform usual arithmetic conversions, they just do integer + // promotions on each operand. C99 6.5.7p3 + QualType LHSTy; + if (lex->getType()->isPromotableIntegerType()) + LHSTy = Context.IntTy; + else { + LHSTy = isPromotableBitField(lex, Context); + if (LHSTy.isNull()) + LHSTy = lex->getType(); + } + if (!isCompAssign) + ImpCastExprToType(lex, LHSTy); + + UsualUnaryConversions(rex); + + // "The type of the result is that of the promoted left operand." + return LHSTy; +} + +// C99 6.5.8, C++ [expr.rel] +QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, + unsigned OpaqueOpc, bool isRelational) { + BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; + + if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) + return CheckVectorCompareOperands(lex, rex, Loc, isRelational); + + // C99 6.5.8p3 / C99 6.5.9p4 + if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) + UsualArithmeticConversions(lex, rex); + else { + UsualUnaryConversions(lex); + UsualUnaryConversions(rex); + } + QualType lType = lex->getType(); + QualType rType = rex->getType(); + + if (!lType->isFloatingType() + && !(lType->isBlockPointerType() && isRelational)) { + // For non-floating point types, check for self-comparisons of the form + // x == x, x != x, x < x, etc. These always evaluate to a constant, and + // often indicate logic errors in the program. + // NOTE: Don't warn about comparisons of enum constants. These can arise + // from macro expansions, and are usually quite deliberate. + Expr *LHSStripped = lex->IgnoreParens(); + Expr *RHSStripped = rex->IgnoreParens(); + if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) + if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) + if (DRL->getDecl() == DRR->getDecl() && + !isa<EnumConstantDecl>(DRL->getDecl())) + Diag(Loc, diag::warn_selfcomparison); + + if (isa<CastExpr>(LHSStripped)) + LHSStripped = LHSStripped->IgnoreParenCasts(); + if (isa<CastExpr>(RHSStripped)) + RHSStripped = RHSStripped->IgnoreParenCasts(); + + // Warn about comparisons against a string constant (unless the other + // operand is null), the user probably wants strcmp. + Expr *literalString = 0; + Expr *literalStringStripped = 0; + if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && + !RHSStripped->isNullPointerConstant(Context)) { + literalString = lex; + literalStringStripped = LHSStripped; + } + else if ((isa<StringLiteral>(RHSStripped) || + isa<ObjCEncodeExpr>(RHSStripped)) && + !LHSStripped->isNullPointerConstant(Context)) { + literalString = rex; + literalStringStripped = RHSStripped; + } + + if (literalString) { + std::string resultComparison; + switch (Opc) { + case BinaryOperator::LT: resultComparison = ") < 0"; break; + case BinaryOperator::GT: resultComparison = ") > 0"; break; + case BinaryOperator::LE: resultComparison = ") <= 0"; break; + case BinaryOperator::GE: resultComparison = ") >= 0"; break; + case BinaryOperator::EQ: resultComparison = ") == 0"; break; + case BinaryOperator::NE: resultComparison = ") != 0"; break; + default: assert(false && "Invalid comparison operator"); + } + Diag(Loc, diag::warn_stringcompare) + << isa<ObjCEncodeExpr>(literalStringStripped) + << literalString->getSourceRange() + << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") + << CodeModificationHint::CreateInsertion(lex->getLocStart(), + "strcmp(") + << CodeModificationHint::CreateInsertion( + PP.getLocForEndOfToken(rex->getLocEnd()), + resultComparison); + } + } + + // The result of comparisons is 'bool' in C++, 'int' in C. + QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; + + if (isRelational) { + if (lType->isRealType() && rType->isRealType()) + return ResultTy; + } else { + // Check for comparisons of floating point operands using != and ==. + if (lType->isFloatingType()) { + assert(rType->isFloatingType()); + CheckFloatComparison(Loc,lex,rex); + } + + if (lType->isArithmeticType() && rType->isArithmeticType()) + return ResultTy; + } + + bool LHSIsNull = lex->isNullPointerConstant(Context); + bool RHSIsNull = rex->isNullPointerConstant(Context); + + // All of the following pointer related warnings are GCC extensions, except + // when handling null pointer constants. One day, we can consider making them + // errors (when -pedantic-errors is enabled). + if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 + QualType LCanPointeeTy = + Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); + QualType RCanPointeeTy = + Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); + + // Simple check: if the pointee types are identical, we're done. + if (LCanPointeeTy == RCanPointeeTy) + return ResultTy; + + if (getLangOptions().CPlusPlus) { + // C++ [expr.rel]p2: + // [...] Pointer conversions (4.10) and qualification + // conversions (4.4) are performed on pointer operands (or on + // a pointer operand and a null pointer constant) to bring + // them to their composite pointer type. [...] + // + // C++ [expr.eq]p2 uses the same notion for (in)equality + // comparisons of pointers. + QualType T = FindCompositePointerType(lex, rex); + if (T.isNull()) { + Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) + << lType << rType << lex->getSourceRange() << rex->getSourceRange(); + return QualType(); + } + + ImpCastExprToType(lex, T); + ImpCastExprToType(rex, T); + return ResultTy; + } + + if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 + !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && + !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), + RCanPointeeTy.getUnqualifiedType()) && + !Context.areComparableObjCPointerTypes(lType, rType)) { + Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) + << lType << rType << lex->getSourceRange() << rex->getSourceRange(); + } + ImpCastExprToType(rex, lType); // promote the pointer to pointer + return ResultTy; + } + // C++ allows comparison of pointers with null pointer constants. + if (getLangOptions().CPlusPlus) { + if (lType->isPointerType() && RHSIsNull) { + ImpCastExprToType(rex, lType); + return ResultTy; + } + if (rType->isPointerType() && LHSIsNull) { + ImpCastExprToType(lex, rType); + return ResultTy; + } + // And comparison of nullptr_t with itself. + if (lType->isNullPtrType() && rType->isNullPtrType()) + return ResultTy; + } + // Handle block pointer types. + if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) { + QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); + QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); + + if (!LHSIsNull && !RHSIsNull && + !Context.typesAreBlockCompatible(lpointee, rpointee)) { + Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) + << lType << rType << lex->getSourceRange() << rex->getSourceRange(); + } + ImpCastExprToType(rex, lType); // promote the pointer to pointer + return ResultTy; + } + // Allow block pointers to be compared with null pointer constants. + if (!isRelational + && ((lType->isBlockPointerType() && rType->isPointerType()) + || (lType->isPointerType() && rType->isBlockPointerType()))) { + if (!LHSIsNull && !RHSIsNull) { + if (!((rType->isPointerType() && rType->getAsPointerType() + ->getPointeeType()->isVoidType()) + || (lType->isPointerType() && lType->getAsPointerType() + ->getPointeeType()->isVoidType()))) + Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) + << lType << rType << lex->getSourceRange() << rex->getSourceRange(); + } + ImpCastExprToType(rex, lType); // promote the pointer to pointer + return ResultTy; + } + + if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { + if (lType->isPointerType() || rType->isPointerType()) { + const PointerType *LPT = lType->getAsPointerType(); + const PointerType *RPT = rType->getAsPointerType(); + bool LPtrToVoid = LPT ? + Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; + bool RPtrToVoid = RPT ? + Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; + + if (!LPtrToVoid && !RPtrToVoid && + !Context.typesAreCompatible(lType, rType)) { + Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) + << lType << rType << lex->getSourceRange() << rex->getSourceRange(); + ImpCastExprToType(rex, lType); + return ResultTy; + } + ImpCastExprToType(rex, lType); + return ResultTy; + } + if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { + ImpCastExprToType(rex, lType); + return ResultTy; + } else { + if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { + Diag(Loc, diag::warn_incompatible_qualified_id_operands) + << lType << rType << lex->getSourceRange() << rex->getSourceRange(); + ImpCastExprToType(rex, lType); + return ResultTy; + } + } + } + if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && + rType->isIntegerType()) { + if (!RHSIsNull) + Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) + << lType << rType << lex->getSourceRange() << rex->getSourceRange(); + ImpCastExprToType(rex, lType); // promote the integer to pointer + return ResultTy; + } + if (lType->isIntegerType() && + (rType->isPointerType() || rType->isObjCQualifiedIdType())) { + if (!LHSIsNull) + Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) + << lType << rType << lex->getSourceRange() << rex->getSourceRange(); + ImpCastExprToType(lex, rType); // promote the integer to pointer + return ResultTy; + } + // Handle block pointers. + if (!isRelational && RHSIsNull + && lType->isBlockPointerType() && rType->isIntegerType()) { + ImpCastExprToType(rex, lType); // promote the integer to pointer + return ResultTy; + } + if (!isRelational && LHSIsNull + && lType->isIntegerType() && rType->isBlockPointerType()) { + ImpCastExprToType(lex, rType); // promote the integer to pointer + return ResultTy; + } + return InvalidOperands(Loc, lex, rex); +} + +/// CheckVectorCompareOperands - vector comparisons are a clang extension that +/// operates on extended vector types. Instead of producing an IntTy result, +/// like a scalar comparison, a vector comparison produces a vector of integer +/// types. +QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, + SourceLocation Loc, + bool isRelational) { + // Check to make sure we're operating on vectors of the same type and width, + // Allowing one side to be a scalar of element type. + QualType vType = CheckVectorOperands(Loc, lex, rex); + if (vType.isNull()) + return vType; + + QualType lType = lex->getType(); + QualType rType = rex->getType(); + + // For non-floating point types, check for self-comparisons of the form + // x == x, x != x, x < x, etc. These always evaluate to a constant, and + // often indicate logic errors in the program. + if (!lType->isFloatingType()) { + if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) + if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) + if (DRL->getDecl() == DRR->getDecl()) + Diag(Loc, diag::warn_selfcomparison); + } + + // Check for comparisons of floating point operands using != and ==. + if (!isRelational && lType->isFloatingType()) { + assert (rType->isFloatingType()); + CheckFloatComparison(Loc,lex,rex); + } + + // FIXME: Vector compare support in the LLVM backend is not fully reliable, + // just reject all vector comparisons for now. + if (1) { + Diag(Loc, diag::err_typecheck_vector_comparison) + << lType << rType << lex->getSourceRange() << rex->getSourceRange(); + return QualType(); + } + + // Return the type for the comparison, which is the same as vector type for + // integer vectors, or an integer type of identical size and number of + // elements for floating point vectors. + if (lType->isIntegerType()) + return lType; + + const VectorType *VTy = lType->getAsVectorType(); + unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); + if (TypeSize == Context.getTypeSize(Context.IntTy)) + return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); + if (TypeSize == Context.getTypeSize(Context.LongTy)) + return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); + + assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && + "Unhandled vector element size in vector compare"); + return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); +} + +inline QualType Sema::CheckBitwiseOperands( + Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) +{ + if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) + return CheckVectorOperands(Loc, lex, rex); + + QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); + + if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) + return compType; + return InvalidOperands(Loc, lex, rex); +} + +inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] + Expr *&lex, Expr *&rex, SourceLocation Loc) +{ + UsualUnaryConversions(lex); + UsualUnaryConversions(rex); + + if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) + return Context.IntTy; + return InvalidOperands(Loc, lex, rex); +} + +/// IsReadonlyProperty - Verify that otherwise a valid l-value expression +/// is a read-only property; return true if so. A readonly property expression +/// depends on various declarations and thus must be treated specially. +/// +static bool IsReadonlyProperty(Expr *E, Sema &S) +{ + if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { + const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); + if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { + QualType BaseType = PropExpr->getBase()->getType(); + if (const PointerType *PTy = BaseType->getAsPointerType()) + if (const ObjCInterfaceType *IFTy = + PTy->getPointeeType()->getAsObjCInterfaceType()) + if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) + if (S.isPropertyReadonly(PDecl, IFace)) + return true; + } + } + return false; +} + +/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, +/// emit an error and return true. If so, return false. +static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { + SourceLocation OrigLoc = Loc; + Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, + &Loc); + if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) + IsLV = Expr::MLV_ReadonlyProperty; + if (IsLV == Expr::MLV_Valid) + return false; + + unsigned Diag = 0; + bool NeedType = false; + switch (IsLV) { // C99 6.5.16p2 + default: assert(0 && "Unknown result from isModifiableLvalue!"); + case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; + case Expr::MLV_ArrayType: + Diag = diag::err_typecheck_array_not_modifiable_lvalue; + NeedType = true; + break; + case Expr::MLV_NotObjectType: + Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; + NeedType = true; + break; + case Expr::MLV_LValueCast: + Diag = diag::err_typecheck_lvalue_casts_not_supported; + break; + case Expr::MLV_InvalidExpression: + Diag = diag::err_typecheck_expression_not_modifiable_lvalue; + break; + case Expr::MLV_IncompleteType: + case Expr::MLV_IncompleteVoidType: + return S.RequireCompleteType(Loc, E->getType(), + diag::err_typecheck_incomplete_type_not_modifiable_lvalue, + E->getSourceRange()); + case Expr::MLV_DuplicateVectorComponents: + Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; + break; + case Expr::MLV_NotBlockQualified: + Diag = diag::err_block_decl_ref_not_modifiable_lvalue; + break; + case Expr::MLV_ReadonlyProperty: + Diag = diag::error_readonly_property_assignment; + break; + case Expr::MLV_NoSetterProperty: + Diag = diag::error_nosetter_property_assignment; + break; + } + + SourceRange Assign; + if (Loc != OrigLoc) + Assign = SourceRange(OrigLoc, OrigLoc); + if (NeedType) + S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; + else + S.Diag(Loc, Diag) << E->getSourceRange() << Assign; + return true; +} + + + +// C99 6.5.16.1 +QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, + SourceLocation Loc, + QualType CompoundType) { + // Verify that LHS is a modifiable lvalue, and emit error if not. + if (CheckForModifiableLvalue(LHS, Loc, *this)) + return QualType(); + + QualType LHSType = LHS->getType(); + QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; + + AssignConvertType ConvTy; + if (CompoundType.isNull()) { + // Simple assignment "x = y". + ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); + // Special case of NSObject attributes on c-style pointer types. + if (ConvTy == IncompatiblePointer && + ((Context.isObjCNSObjectType(LHSType) && + Context.isObjCObjectPointerType(RHSType)) || + (Context.isObjCNSObjectType(RHSType) && + Context.isObjCObjectPointerType(LHSType)))) + ConvTy = Compatible; + + // If the RHS is a unary plus or minus, check to see if they = and + are + // right next to each other. If so, the user may have typo'd "x =+ 4" + // instead of "x += 4". + Expr *RHSCheck = RHS; + if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) + RHSCheck = ICE->getSubExpr(); + if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { + if ((UO->getOpcode() == UnaryOperator::Plus || + UO->getOpcode() == UnaryOperator::Minus) && + Loc.isFileID() && UO->getOperatorLoc().isFileID() && + // Only if the two operators are exactly adjacent. + Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && + // And there is a space or other character before the subexpr of the + // unary +/-. We don't want to warn on "x=-1". + Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && + UO->getSubExpr()->getLocStart().isFileID()) { + Diag(Loc, diag::warn_not_compound_assign) + << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") + << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); + } + } + } else { + // Compound assignment "x += y" + ConvTy = CheckAssignmentConstraints(LHSType, RHSType); + } + + if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, + RHS, "assigning")) + return QualType(); + + // C99 6.5.16p3: The type of an assignment expression is the type of the + // left operand unless the left operand has qualified type, in which case + // it is the unqualified version of the type of the left operand. + // C99 6.5.16.1p2: In simple assignment, the value of the right operand + // is converted to the type of the assignment expression (above). + // C++ 5.17p1: the type of the assignment expression is that of its left + // operand. + return LHSType.getUnqualifiedType(); +} + +// C99 6.5.17 +QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { + // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. + DefaultFunctionArrayConversion(RHS); + + // FIXME: Check that RHS type is complete in C mode (it's legal for it to be + // incomplete in C++). + + return RHS->getType(); +} + +/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine +/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. +QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, + bool isInc) { + if (Op->isTypeDependent()) + return Context.DependentTy; + + QualType ResType = Op->getType(); + assert(!ResType.isNull() && "no type for increment/decrement expression"); + + if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { + // Decrement of bool is not allowed. + if (!isInc) { + Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); + return QualType(); + } + // Increment of bool sets it to true, but is deprecated. + Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); + } else if (ResType->isRealType()) { + // OK! + } else if (const PointerType *PT = ResType->getAsPointerType()) { + // C99 6.5.2.4p2, 6.5.6p2 + if (PT->getPointeeType()->isVoidType()) { + if (getLangOptions().CPlusPlus) { + Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) + << Op->getSourceRange(); + return QualType(); + } + + // Pointer to void is a GNU extension in C. + Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); + } else if (PT->getPointeeType()->isFunctionType()) { + if (getLangOptions().CPlusPlus) { + Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) + << Op->getType() << Op->getSourceRange(); + return QualType(); + } + + Diag(OpLoc, diag::ext_gnu_ptr_func_arith) + << ResType << Op->getSourceRange(); + } else if (RequireCompleteType(OpLoc, PT->getPointeeType(), + diag::err_typecheck_arithmetic_incomplete_type, + Op->getSourceRange(), SourceRange(), + ResType)) + return QualType(); + } else if (ResType->isComplexType()) { + // C99 does not support ++/-- on complex types, we allow as an extension. + Diag(OpLoc, diag::ext_integer_increment_complex) + << ResType << Op->getSourceRange(); + } else { + Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) + << ResType << Op->getSourceRange(); + return QualType(); + } + // At this point, we know we have a real, complex or pointer type. + // Now make sure the operand is a modifiable lvalue. + if (CheckForModifiableLvalue(Op, OpLoc, *this)) + return QualType(); + return ResType; +} + +/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). +/// This routine allows us to typecheck complex/recursive expressions +/// where the declaration is needed for type checking. We only need to +/// handle cases when the expression references a function designator +/// or is an lvalue. Here are some examples: +/// - &(x) => x +/// - &*****f => f for f a function designator. +/// - &s.xx => s +/// - &s.zz[1].yy -> s, if zz is an array +/// - *(x + 1) -> x, if x is an array +/// - &"123"[2] -> 0 +/// - & __real__ x -> x +static NamedDecl *getPrimaryDecl(Expr *E) { + switch (E->getStmtClass()) { + case Stmt::DeclRefExprClass: + case Stmt::QualifiedDeclRefExprClass: + return cast<DeclRefExpr>(E)->getDecl(); + case Stmt::MemberExprClass: + // If this is an arrow operator, the address is an offset from + // the base's value, so the object the base refers to is + // irrelevant. + if (cast<MemberExpr>(E)->isArrow()) + return 0; + // Otherwise, the expression refers to a part of the base + return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); + case Stmt::ArraySubscriptExprClass: { + // FIXME: This code shouldn't be necessary! We should catch the implicit + // promotion of register arrays earlier. + Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); + if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { + if (ICE->getSubExpr()->getType()->isArrayType()) + return getPrimaryDecl(ICE->getSubExpr()); + } + return 0; + } + case Stmt::UnaryOperatorClass: { + UnaryOperator *UO = cast<UnaryOperator>(E); + + switch(UO->getOpcode()) { + case UnaryOperator::Real: + case UnaryOperator::Imag: + case UnaryOperator::Extension: + return getPrimaryDecl(UO->getSubExpr()); + default: + return 0; + } + } + case Stmt::ParenExprClass: + return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); + case Stmt::ImplicitCastExprClass: + // If the result of an implicit cast is an l-value, we care about + // the sub-expression; otherwise, the result here doesn't matter. + return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); + default: + return 0; + } +} + +/// CheckAddressOfOperand - The operand of & must be either a function +/// designator or an lvalue designating an object. If it is an lvalue, the +/// object cannot be declared with storage class register or be a bit field. +/// Note: The usual conversions are *not* applied to the operand of the & +/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. +/// In C++, the operand might be an overloaded function name, in which case +/// we allow the '&' but retain the overloaded-function type. +QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { + // Make sure to ignore parentheses in subsequent checks + op = op->IgnoreParens(); + + if (op->isTypeDependent()) + return Context.DependentTy; + + if (getLangOptions().C99) { + // Implement C99-only parts of addressof rules. + if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { + if (uOp->getOpcode() == UnaryOperator::Deref) + // Per C99 6.5.3.2, the address of a deref always returns a valid result + // (assuming the deref expression is valid). + return uOp->getSubExpr()->getType(); + } + // Technically, there should be a check for array subscript + // expressions here, but the result of one is always an lvalue anyway. + } + NamedDecl *dcl = getPrimaryDecl(op); + Expr::isLvalueResult lval = op->isLvalue(Context); + + if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) { + // C99 6.5.3.2p1 + // The operand must be either an l-value or a function designator + if (!op->getType()->isFunctionType()) { + // FIXME: emit more specific diag... + Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) + << op->getSourceRange(); + return QualType(); + } + } else if (op->getBitField()) { // C99 6.5.3.2p1 + // The operand cannot be a bit-field + Diag(OpLoc, diag::err_typecheck_address_of) + << "bit-field" << op->getSourceRange(); + return QualType(); + } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && + cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ + // The operand cannot be an element of a vector + Diag(OpLoc, diag::err_typecheck_address_of) + << "vector element" << op->getSourceRange(); + return QualType(); + } else if (dcl) { // C99 6.5.3.2p1 + // We have an lvalue with a decl. Make sure the decl is not declared + // with the register storage-class specifier. + if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { + if (vd->getStorageClass() == VarDecl::Register) { + Diag(OpLoc, diag::err_typecheck_address_of) + << "register variable" << op->getSourceRange(); + return QualType(); + } + } else if (isa<OverloadedFunctionDecl>(dcl)) { + return Context.OverloadTy; + } else if (isa<FieldDecl>(dcl)) { + // Okay: we can take the address of a field. + // Could be a pointer to member, though, if there is an explicit + // scope qualifier for the class. + if (isa<QualifiedDeclRefExpr>(op)) { + DeclContext *Ctx = dcl->getDeclContext(); + if (Ctx && Ctx->isRecord()) + return Context.getMemberPointerType(op->getType(), + Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); + } + } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(dcl)) { + // Okay: we can take the address of a function. + // As above. + if (isa<QualifiedDeclRefExpr>(op) && MD->isInstance()) + return Context.getMemberPointerType(op->getType(), + Context.getTypeDeclType(MD->getParent()).getTypePtr()); + } else if (!isa<FunctionDecl>(dcl)) + assert(0 && "Unknown/unexpected decl type"); + } + + if (lval == Expr::LV_IncompleteVoidType) { + // Taking the address of a void variable is technically illegal, but we + // allow it in cases which are otherwise valid. + // Example: "extern void x; void* y = &x;". + Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange(); + } + + // If the operand has type "type", the result has type "pointer to type". + return Context.getPointerType(op->getType()); +} + +QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { + if (Op->isTypeDependent()) + return Context.DependentTy; + + UsualUnaryConversions(Op); + QualType Ty = Op->getType(); + + // Note that per both C89 and C99, this is always legal, even if ptype is an + // incomplete type or void. It would be possible to warn about dereferencing + // a void pointer, but it's completely well-defined, and such a warning is + // unlikely to catch any mistakes. + if (const PointerType *PT = Ty->getAsPointerType()) + return PT->getPointeeType(); + + Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) + << Ty << Op->getSourceRange(); + return QualType(); +} + +static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( + tok::TokenKind Kind) { + BinaryOperator::Opcode Opc; + switch (Kind) { + default: assert(0 && "Unknown binop!"); + case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; + case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; + case tok::star: Opc = BinaryOperator::Mul; break; + case tok::slash: Opc = BinaryOperator::Div; break; + case tok::percent: Opc = BinaryOperator::Rem; break; + case tok::plus: Opc = BinaryOperator::Add; break; + case tok::minus: Opc = BinaryOperator::Sub; break; + case tok::lessless: Opc = BinaryOperator::Shl; break; + case tok::greatergreater: Opc = BinaryOperator::Shr; break; + case tok::lessequal: Opc = BinaryOperator::LE; break; + case tok::less: Opc = BinaryOperator::LT; break; + case tok::greaterequal: Opc = BinaryOperator::GE; break; + case tok::greater: Opc = BinaryOperator::GT; break; + case tok::exclaimequal: Opc = BinaryOperator::NE; break; + case tok::equalequal: Opc = BinaryOperator::EQ; break; + case tok::amp: Opc = BinaryOperator::And; break; + case tok::caret: Opc = BinaryOperator::Xor; break; + case tok::pipe: Opc = BinaryOperator::Or; break; + case tok::ampamp: Opc = BinaryOperator::LAnd; break; + case tok::pipepipe: Opc = BinaryOperator::LOr; break; + case tok::equal: Opc = BinaryOperator::Assign; break; + case tok::starequal: Opc = BinaryOperator::MulAssign; break; + case tok::slashequal: Opc = BinaryOperator::DivAssign; break; + case tok::percentequal: Opc = BinaryOperator::RemAssign; break; + case tok::plusequal: Opc = BinaryOperator::AddAssign; break; + case tok::minusequal: Opc = BinaryOperator::SubAssign; break; + case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; + case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; + case tok::ampequal: Opc = BinaryOperator::AndAssign; break; + case tok::caretequal: Opc = BinaryOperator::XorAssign; break; + case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; + case tok::comma: Opc = BinaryOperator::Comma; break; + } + return Opc; +} + +static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( + tok::TokenKind Kind) { + UnaryOperator::Opcode Opc; + switch (Kind) { + default: assert(0 && "Unknown unary op!"); + case tok::plusplus: Opc = UnaryOperator::PreInc; break; + case tok::minusminus: Opc = UnaryOperator::PreDec; break; + case tok::amp: Opc = UnaryOperator::AddrOf; break; + case tok::star: Opc = UnaryOperator::Deref; break; + case tok::plus: Opc = UnaryOperator::Plus; break; + case tok::minus: Opc = UnaryOperator::Minus; break; + case tok::tilde: Opc = UnaryOperator::Not; break; + case tok::exclaim: Opc = UnaryOperator::LNot; break; + case tok::kw___real: Opc = UnaryOperator::Real; break; + case tok::kw___imag: Opc = UnaryOperator::Imag; break; + case tok::kw___extension__: Opc = UnaryOperator::Extension; break; + } + return Opc; +} + +/// CreateBuiltinBinOp - Creates a new built-in binary operation with +/// operator @p Opc at location @c TokLoc. This routine only supports +/// built-in operations; ActOnBinOp handles overloaded operators. +Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, + unsigned Op, + Expr *lhs, Expr *rhs) { + QualType ResultTy; // Result type of the binary operator. + BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; + // The following two variables are used for compound assignment operators + QualType CompLHSTy; // Type of LHS after promotions for computation + QualType CompResultTy; // Type of computation result + + switch (Opc) { + case BinaryOperator::Assign: + ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); + break; + case BinaryOperator::PtrMemD: + case BinaryOperator::PtrMemI: + ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, + Opc == BinaryOperator::PtrMemI); + break; + case BinaryOperator::Mul: + case BinaryOperator::Div: + ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); + break; + case BinaryOperator::Rem: + ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); + break; + case BinaryOperator::Add: + ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); + break; + case BinaryOperator::Sub: + ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); + break; + case BinaryOperator::Shl: + case BinaryOperator::Shr: + ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); + break; + case BinaryOperator::LE: + case BinaryOperator::LT: + case BinaryOperator::GE: + case BinaryOperator::GT: + ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); + break; + case BinaryOperator::EQ: + case BinaryOperator::NE: + ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); + break; + case BinaryOperator::And: + case BinaryOperator::Xor: + case BinaryOperator::Or: + ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); + break; + case BinaryOperator::LAnd: + case BinaryOperator::LOr: + ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); + break; + case BinaryOperator::MulAssign: + case BinaryOperator::DivAssign: + CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); + CompLHSTy = CompResultTy; + if (!CompResultTy.isNull()) + ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); + break; + case BinaryOperator::RemAssign: + CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); + CompLHSTy = CompResultTy; + if (!CompResultTy.isNull()) + ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); + break; + case BinaryOperator::AddAssign: + CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); + if (!CompResultTy.isNull()) + ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); + break; + case BinaryOperator::SubAssign: + CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); + if (!CompResultTy.isNull()) + ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); + break; + case BinaryOperator::ShlAssign: + case BinaryOperator::ShrAssign: + CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); + CompLHSTy = CompResultTy; + if (!CompResultTy.isNull()) + ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); + break; + case BinaryOperator::AndAssign: + case BinaryOperator::XorAssign: + case BinaryOperator::OrAssign: + CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); + CompLHSTy = CompResultTy; + if (!CompResultTy.isNull()) + ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); + break; + case BinaryOperator::Comma: + ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); + break; + } + if (ResultTy.isNull()) + return ExprError(); + if (CompResultTy.isNull()) + return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); + else + return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, + CompLHSTy, CompResultTy, + OpLoc)); +} + +// Binary Operators. 'Tok' is the token for the operator. +Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, + tok::TokenKind Kind, + ExprArg LHS, ExprArg RHS) { + BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); + Expr *lhs = LHS.takeAs<Expr>(), *rhs = RHS.takeAs<Expr>(); + + assert((lhs != 0) && "ActOnBinOp(): missing left expression"); + assert((rhs != 0) && "ActOnBinOp(): missing right expression"); + + if (getLangOptions().CPlusPlus && + (lhs->getType()->isOverloadableType() || + rhs->getType()->isOverloadableType())) { + // Find all of the overloaded operators visible from this + // point. We perform both an operator-name lookup from the local + // scope and an argument-dependent lookup based on the types of + // the arguments. + FunctionSet Functions; + OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); + if (OverOp != OO_None) { + LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), + Functions); + Expr *Args[2] = { lhs, rhs }; + DeclarationName OpName + = Context.DeclarationNames.getCXXOperatorName(OverOp); + ArgumentDependentLookup(OpName, Args, 2, Functions); + } + + // Build the (potentially-overloaded, potentially-dependent) + // binary operation. + return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); + } + + // Build a built-in binary operation. + return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); +} + +Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, + unsigned OpcIn, + ExprArg InputArg) { + UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); + + // FIXME: Input is modified below, but InputArg is not updated appropriately. + Expr *Input = (Expr *)InputArg.get(); + QualType resultType; + switch (Opc) { + case UnaryOperator::PostInc: + case UnaryOperator::PostDec: + case UnaryOperator::OffsetOf: + assert(false && "Invalid unary operator"); + break; + + case UnaryOperator::PreInc: + case UnaryOperator::PreDec: + resultType = CheckIncrementDecrementOperand(Input, OpLoc, + Opc == UnaryOperator::PreInc); + break; + case UnaryOperator::AddrOf: + resultType = CheckAddressOfOperand(Input, OpLoc); + break; + case UnaryOperator::Deref: + DefaultFunctionArrayConversion(Input); + resultType = CheckIndirectionOperand(Input, OpLoc); + break; + case UnaryOperator::Plus: + case UnaryOperator::Minus: + UsualUnaryConversions(Input); + resultType = Input->getType(); + if (resultType->isDependentType()) + break; + if (resultType->isArithmeticType()) // C99 6.5.3.3p1 + break; + else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 + resultType->isEnumeralType()) + break; + else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 + Opc == UnaryOperator::Plus && + resultType->isPointerType()) + break; + + return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) + << resultType << Input->getSourceRange()); + case UnaryOperator::Not: // bitwise complement + UsualUnaryConversions(Input); + resultType = Input->getType(); + if (resultType->isDependentType()) + break; + // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. + if (resultType->isComplexType() || resultType->isComplexIntegerType()) + // C99 does not support '~' for complex conjugation. + Diag(OpLoc, diag::ext_integer_complement_complex) + << resultType << Input->getSourceRange(); + else if (!resultType->isIntegerType()) + return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) + << resultType << Input->getSourceRange()); + break; + case UnaryOperator::LNot: // logical negation + // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). + DefaultFunctionArrayConversion(Input); + resultType = Input->getType(); + if (resultType->isDependentType()) + break; + if (!resultType->isScalarType()) // C99 6.5.3.3p1 + return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) + << resultType << Input->getSourceRange()); + // LNot always has type int. C99 6.5.3.3p5. + // In C++, it's bool. C++ 5.3.1p8 + resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; + break; + case UnaryOperator::Real: + case UnaryOperator::Imag: + resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); + break; + case UnaryOperator::Extension: + resultType = Input->getType(); + break; + } + if (resultType.isNull()) + return ExprError(); + + InputArg.release(); + return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); +} + +// Unary Operators. 'Tok' is the token for the operator. +Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, + tok::TokenKind Op, ExprArg input) { + Expr *Input = (Expr*)input.get(); + UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); + + if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { + // Find all of the overloaded operators visible from this + // point. We perform both an operator-name lookup from the local + // scope and an argument-dependent lookup based on the types of + // the arguments. + FunctionSet Functions; + OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); + if (OverOp != OO_None) { + LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), + Functions); + DeclarationName OpName + = Context.DeclarationNames.getCXXOperatorName(OverOp); + ArgumentDependentLookup(OpName, &Input, 1, Functions); + } + + return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); + } + + return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); +} + +/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". +Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, + SourceLocation LabLoc, + IdentifierInfo *LabelII) { + // Look up the record for this label identifier. + LabelStmt *&LabelDecl = getLabelMap()[LabelII]; + + // If we haven't seen this label yet, create a forward reference. It + // will be validated and/or cleaned up in ActOnFinishFunctionBody. + if (LabelDecl == 0) + LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); + + // Create the AST node. The address of a label always has type 'void*'. + return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, + Context.getPointerType(Context.VoidTy))); +} + +Sema::OwningExprResult +Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, + SourceLocation RPLoc) { // "({..})" + Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); + assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); + CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); + + bool isFileScope = getCurFunctionOrMethodDecl() == 0; + if (isFileScope) + return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); + + // FIXME: there are a variety of strange constraints to enforce here, for + // example, it is not possible to goto into a stmt expression apparently. + // More semantic analysis is needed. + + // If there are sub stmts in the compound stmt, take the type of the last one + // as the type of the stmtexpr. + QualType Ty = Context.VoidTy; + + if (!Compound->body_empty()) { + Stmt *LastStmt = Compound->body_back(); + // If LastStmt is a label, skip down through into the body. + while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) + LastStmt = Label->getSubStmt(); + + if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) + Ty = LastExpr->getType(); + } + + // FIXME: Check that expression type is complete/non-abstract; statement + // expressions are not lvalues. + + substmt.release(); + return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); +} + +Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, + SourceLocation BuiltinLoc, + SourceLocation TypeLoc, + TypeTy *argty, + OffsetOfComponent *CompPtr, + unsigned NumComponents, + SourceLocation RPLoc) { + // FIXME: This function leaks all expressions in the offset components on + // error. + QualType ArgTy = QualType::getFromOpaquePtr(argty); + assert(!ArgTy.isNull() && "Missing type argument!"); + + bool Dependent = ArgTy->isDependentType(); + + // We must have at least one component that refers to the type, and the first + // one is known to be a field designator. Verify that the ArgTy represents + // a struct/union/class. + if (!Dependent && !ArgTy->isRecordType()) + return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); + + // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable + // with an incomplete type would be illegal. + + // Otherwise, create a null pointer as the base, and iteratively process + // the offsetof designators. + QualType ArgTyPtr = Context.getPointerType(ArgTy); + Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); + Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, + ArgTy, SourceLocation()); + + // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a + // GCC extension, diagnose them. + // FIXME: This diagnostic isn't actually visible because the location is in + // a system header! + if (NumComponents != 1) + Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) + << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); + + if (!Dependent) { + bool DidWarnAboutNonPOD = false; + + // FIXME: Dependent case loses a lot of information here. And probably + // leaks like a sieve. + for (unsigned i = 0; i != NumComponents; ++i) { + const OffsetOfComponent &OC = CompPtr[i]; + if (OC.isBrackets) { + // Offset of an array sub-field. TODO: Should we allow vector elements? + const ArrayType *AT = Context.getAsArrayType(Res->getType()); + if (!AT) { + Res->Destroy(Context); + return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) + << Res->getType()); + } + + // FIXME: C++: Verify that operator[] isn't overloaded. + + // Promote the array so it looks more like a normal array subscript + // expression. + DefaultFunctionArrayConversion(Res); + + // C99 6.5.2.1p1 + Expr *Idx = static_cast<Expr*>(OC.U.E); + // FIXME: Leaks Res + if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) + return ExprError(Diag(Idx->getLocStart(), + diag::err_typecheck_subscript_not_integer) + << Idx->getSourceRange()); + + Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), + OC.LocEnd); + continue; + } + + const RecordType *RC = Res->getType()->getAsRecordType(); + if (!RC) { + Res->Destroy(Context); + return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) + << Res->getType()); + } + + // Get the decl corresponding to this. + RecordDecl *RD = RC->getDecl(); + if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { + if (!CRD->isPOD() && !DidWarnAboutNonPOD) { + ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type) + << SourceRange(CompPtr[0].LocStart, OC.LocEnd) + << Res->getType()); + DidWarnAboutNonPOD = true; + } + } + + FieldDecl *MemberDecl + = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, + LookupMemberName) + .getAsDecl()); + // FIXME: Leaks Res + if (!MemberDecl) + return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member) + << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); + + // FIXME: C++: Verify that MemberDecl isn't a static field. + // FIXME: Verify that MemberDecl isn't a bitfield. + if (cast<RecordDecl>(MemberDecl->getDeclContext())->isAnonymousStructOrUnion()) { + Res = BuildAnonymousStructUnionMemberReference( + SourceLocation(), MemberDecl, Res, SourceLocation()).takeAs<Expr>(); + } else { + // MemberDecl->getType() doesn't get the right qualifiers, but it + // doesn't matter here. + Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, + MemberDecl->getType().getNonReferenceType()); + } + } + } + + return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, + Context.getSizeType(), BuiltinLoc)); +} + + +Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, + TypeTy *arg1,TypeTy *arg2, + SourceLocation RPLoc) { + QualType argT1 = QualType::getFromOpaquePtr(arg1); + QualType argT2 = QualType::getFromOpaquePtr(arg2); + + assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); + + if (getLangOptions().CPlusPlus) { + Diag(BuiltinLoc, diag::err_types_compatible_p_in_cplusplus) + << SourceRange(BuiltinLoc, RPLoc); + return ExprError(); + } + + return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, + argT1, argT2, RPLoc)); +} + +Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, + ExprArg cond, + ExprArg expr1, ExprArg expr2, + SourceLocation RPLoc) { + Expr *CondExpr = static_cast<Expr*>(cond.get()); + Expr *LHSExpr = static_cast<Expr*>(expr1.get()); + Expr *RHSExpr = static_cast<Expr*>(expr2.get()); + + assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); + + QualType resType; + if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) { + resType = Context.DependentTy; + } else { + // The conditional expression is required to be a constant expression. + llvm::APSInt condEval(32); + SourceLocation ExpLoc; + if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) + return ExprError(Diag(ExpLoc, + diag::err_typecheck_choose_expr_requires_constant) + << CondExpr->getSourceRange()); + + // If the condition is > zero, then the AST type is the same as the LSHExpr. + resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); + } + + cond.release(); expr1.release(); expr2.release(); + return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, + resType, RPLoc)); +} + +//===----------------------------------------------------------------------===// +// Clang Extensions. +//===----------------------------------------------------------------------===// + +/// ActOnBlockStart - This callback is invoked when a block literal is started. +void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { + // Analyze block parameters. + BlockSemaInfo *BSI = new BlockSemaInfo(); + + // Add BSI to CurBlock. + BSI->PrevBlockInfo = CurBlock; + CurBlock = BSI; + + BSI->ReturnType = 0; + BSI->TheScope = BlockScope; + BSI->hasBlockDeclRefExprs = false; + BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; + CurFunctionNeedsScopeChecking = false; + + BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); + PushDeclContext(BlockScope, BSI->TheDecl); +} + +void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { + assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!"); + + if (ParamInfo.getNumTypeObjects() == 0 + || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { + ProcessDeclAttributes(CurBlock->TheDecl, ParamInfo); + QualType T = GetTypeForDeclarator(ParamInfo, CurScope); + + if (T->isArrayType()) { + Diag(ParamInfo.getSourceRange().getBegin(), + diag::err_block_returns_array); + return; + } + + // The parameter list is optional, if there was none, assume (). + if (!T->isFunctionType()) + T = Context.getFunctionType(T, NULL, 0, 0, 0); + + CurBlock->hasPrototype = true; + CurBlock->isVariadic = false; + // Check for a valid sentinel attribute on this block. + if (CurBlock->TheDecl->getAttr<SentinelAttr>()) { + Diag(ParamInfo.getAttributes()->getLoc(), + diag::warn_attribute_sentinel_not_variadic) << 1; + // FIXME: remove the attribute. + } + QualType RetTy = T.getTypePtr()->getAsFunctionType()->getResultType(); + + // Do not allow returning a objc interface by-value. + if (RetTy->isObjCInterfaceType()) { + Diag(ParamInfo.getSourceRange().getBegin(), + diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; + return; + } + return; + } + + // Analyze arguments to block. + assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && + "Not a function declarator!"); + DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; + + CurBlock->hasPrototype = FTI.hasPrototype; + CurBlock->isVariadic = true; + + // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes + // no arguments, not a function that takes a single void argument. + if (FTI.hasPrototype && + FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && + (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& + FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { + // empty arg list, don't push any params. + CurBlock->isVariadic = false; + } else if (FTI.hasPrototype) { + for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) + CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); + CurBlock->isVariadic = FTI.isVariadic; + } + CurBlock->TheDecl->setParams(Context, CurBlock->Params.data(), + CurBlock->Params.size()); + CurBlock->TheDecl->setIsVariadic(CurBlock->isVariadic); + ProcessDeclAttributes(CurBlock->TheDecl, ParamInfo); + for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), + E = CurBlock->TheDecl->param_end(); AI != E; ++AI) + // If this has an identifier, add it to the scope stack. + if ((*AI)->getIdentifier()) + PushOnScopeChains(*AI, CurBlock->TheScope); + + // Check for a valid sentinel attribute on this block. + if (!CurBlock->isVariadic && CurBlock->TheDecl->getAttr<SentinelAttr>()) { + Diag(ParamInfo.getAttributes()->getLoc(), + diag::warn_attribute_sentinel_not_variadic) << 1; + // FIXME: remove the attribute. + } + + // Analyze the return type. + QualType T = GetTypeForDeclarator(ParamInfo, CurScope); + QualType RetTy = T->getAsFunctionType()->getResultType(); + + // Do not allow returning a objc interface by-value. + if (RetTy->isObjCInterfaceType()) { + Diag(ParamInfo.getSourceRange().getBegin(), + diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; + } else if (!RetTy->isDependentType()) + CurBlock->ReturnType = RetTy.getTypePtr(); +} + +/// ActOnBlockError - If there is an error parsing a block, this callback +/// is invoked to pop the information about the block from the action impl. +void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { + // Ensure that CurBlock is deleted. + llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); + + CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; + + // Pop off CurBlock, handle nested blocks. + PopDeclContext(); + CurBlock = CurBlock->PrevBlockInfo; + // FIXME: Delete the ParmVarDecl objects as well??? +} + +/// ActOnBlockStmtExpr - This is called when the body of a block statement +/// literal was successfully completed. ^(int x){...} +Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, + StmtArg body, Scope *CurScope) { + // If blocks are disabled, emit an error. + if (!LangOpts.Blocks) + Diag(CaretLoc, diag::err_blocks_disable); + + // Ensure that CurBlock is deleted. + llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); + + PopDeclContext(); + + // Pop off CurBlock, handle nested blocks. + CurBlock = CurBlock->PrevBlockInfo; + + QualType RetTy = Context.VoidTy; + if (BSI->ReturnType) + RetTy = QualType(BSI->ReturnType, 0); + + llvm::SmallVector<QualType, 8> ArgTypes; + for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) + ArgTypes.push_back(BSI->Params[i]->getType()); + + QualType BlockTy; + if (!BSI->hasPrototype) + BlockTy = Context.getFunctionNoProtoType(RetTy); + else + BlockTy = Context.getFunctionType(RetTy, ArgTypes.data(), ArgTypes.size(), + BSI->isVariadic, 0); + + // FIXME: Check that return/parameter types are complete/non-abstract + + BlockTy = Context.getBlockPointerType(BlockTy); + + // If needed, diagnose invalid gotos and switches in the block. + if (CurFunctionNeedsScopeChecking) + DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); + CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; + + BSI->TheDecl->setBody(body.takeAs<CompoundStmt>()); + return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, + BSI->hasBlockDeclRefExprs)); +} + +Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, + ExprArg expr, TypeTy *type, + SourceLocation RPLoc) { + QualType T = QualType::getFromOpaquePtr(type); + Expr *E = static_cast<Expr*>(expr.get()); + Expr *OrigExpr = E; + + InitBuiltinVaListType(); + + // Get the va_list type + QualType VaListType = Context.getBuiltinVaListType(); + if (VaListType->isArrayType()) { + // Deal with implicit array decay; for example, on x86-64, + // va_list is an array, but it's supposed to decay to + // a pointer for va_arg. + VaListType = Context.getArrayDecayedType(VaListType); + // Make sure the input expression also decays appropriately. + UsualUnaryConversions(E); + } else { + // Otherwise, the va_list argument must be an l-value because + // it is modified by va_arg. + if (!E->isTypeDependent() && + CheckForModifiableLvalue(E, BuiltinLoc, *this)) + return ExprError(); + } + + if (!E->isTypeDependent() && + !Context.hasSameType(VaListType, E->getType())) { + return ExprError(Diag(E->getLocStart(), + diag::err_first_argument_to_va_arg_not_of_type_va_list) + << OrigExpr->getType() << E->getSourceRange()); + } + + // FIXME: Check that type is complete/non-abstract + // FIXME: Warn if a non-POD type is passed in. + + expr.release(); + return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), + RPLoc)); +} + +Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { + // The type of __null will be int or long, depending on the size of + // pointers on the target. + QualType Ty; + if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) + Ty = Context.IntTy; + else + Ty = Context.LongTy; + + return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); +} + +bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, + SourceLocation Loc, + QualType DstType, QualType SrcType, + Expr *SrcExpr, const char *Flavor) { + // Decode the result (notice that AST's are still created for extensions). + bool isInvalid = false; + unsigned DiagKind; + switch (ConvTy) { + default: assert(0 && "Unknown conversion type"); + case Compatible: return false; + case PointerToInt: + DiagKind = diag::ext_typecheck_convert_pointer_int; + break; + case IntToPointer: + DiagKind = diag::ext_typecheck_convert_int_pointer; + break; + case IncompatiblePointer: + DiagKind = diag::ext_typecheck_convert_incompatible_pointer; + break; + case IncompatiblePointerSign: + DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; + break; + case FunctionVoidPointer: + DiagKind = diag::ext_typecheck_convert_pointer_void_func; + break; + case CompatiblePointerDiscardsQualifiers: + // If the qualifiers lost were because we were applying the + // (deprecated) C++ conversion from a string literal to a char* + // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: + // Ideally, this check would be performed in + // CheckPointerTypesForAssignment. However, that would require a + // bit of refactoring (so that the second argument is an + // expression, rather than a type), which should be done as part + // of a larger effort to fix CheckPointerTypesForAssignment for + // C++ semantics. + if (getLangOptions().CPlusPlus && + IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) + return false; + DiagKind = diag::ext_typecheck_convert_discards_qualifiers; + break; + case IntToBlockPointer: + DiagKind = diag::err_int_to_block_pointer; + break; + case IncompatibleBlockPointer: + DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; + break; + case IncompatibleObjCQualifiedId: + // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since + // it can give a more specific diagnostic. + DiagKind = diag::warn_incompatible_qualified_id; + break; + case IncompatibleVectors: + DiagKind = diag::warn_incompatible_vectors; + break; + case Incompatible: + DiagKind = diag::err_typecheck_convert_incompatible; + isInvalid = true; + break; + } + + Diag(Loc, DiagKind) << DstType << SrcType << Flavor + << SrcExpr->getSourceRange(); + return isInvalid; +} + +bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){ + llvm::APSInt ICEResult; + if (E->isIntegerConstantExpr(ICEResult, Context)) { + if (Result) + *Result = ICEResult; + return false; + } + + Expr::EvalResult EvalResult; + + if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || + EvalResult.HasSideEffects) { + Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); + + if (EvalResult.Diag) { + // We only show the note if it's not the usual "invalid subexpression" + // or if it's actually in a subexpression. + if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || + E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) + Diag(EvalResult.DiagLoc, EvalResult.Diag); + } + + return true; + } + + Diag(E->getExprLoc(), diag::ext_expr_not_ice) << + E->getSourceRange(); + + if (EvalResult.Diag && + Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) + Diag(EvalResult.DiagLoc, EvalResult.Diag); + + if (Result) + *Result = EvalResult.Val.getInt(); + return false; +} |