forked from OSchip/llvm-project
1053 lines
43 KiB
C++
1053 lines
43 KiB
C++
//===--- SemaExprObjC.cpp - Semantic Analysis for ObjC Expressions --------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements semantic analysis for Objective-C expressions.
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//
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//===----------------------------------------------------------------------===//
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#include "Sema.h"
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#include "Lookup.h"
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#include "SemaInit.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/ExprObjC.h"
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#include "clang/AST/TypeLoc.h"
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#include "llvm/ADT/SmallString.h"
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#include "clang/Lex/Preprocessor.h"
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using namespace clang;
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Sema::ExprResult Sema::ParseObjCStringLiteral(SourceLocation *AtLocs,
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ExprTy **strings,
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unsigned NumStrings) {
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StringLiteral **Strings = reinterpret_cast<StringLiteral**>(strings);
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// Most ObjC strings are formed out of a single piece. However, we *can*
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// have strings formed out of multiple @ strings with multiple pptokens in
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// each one, e.g. @"foo" "bar" @"baz" "qux" which need to be turned into one
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// StringLiteral for ObjCStringLiteral to hold onto.
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StringLiteral *S = Strings[0];
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// If we have a multi-part string, merge it all together.
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if (NumStrings != 1) {
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// Concatenate objc strings.
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llvm::SmallString<128> StrBuf;
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llvm::SmallVector<SourceLocation, 8> StrLocs;
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for (unsigned i = 0; i != NumStrings; ++i) {
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S = Strings[i];
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// ObjC strings can't be wide.
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if (S->isWide()) {
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Diag(S->getLocStart(), diag::err_cfstring_literal_not_string_constant)
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<< S->getSourceRange();
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return true;
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}
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// Get the string data.
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StrBuf.append(S->getStrData(), S->getStrData()+S->getByteLength());
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// Get the locations of the string tokens.
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StrLocs.append(S->tokloc_begin(), S->tokloc_end());
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// Free the temporary string.
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S->Destroy(Context);
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}
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// Create the aggregate string with the appropriate content and location
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// information.
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S = StringLiteral::Create(Context, &StrBuf[0], StrBuf.size(), false,
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Context.getPointerType(Context.CharTy),
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&StrLocs[0], StrLocs.size());
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}
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// Verify that this composite string is acceptable for ObjC strings.
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if (CheckObjCString(S))
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return true;
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// Initialize the constant string interface lazily. This assumes
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// the NSString interface is seen in this translation unit. Note: We
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// don't use NSConstantString, since the runtime team considers this
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// interface private (even though it appears in the header files).
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QualType Ty = Context.getObjCConstantStringInterface();
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if (!Ty.isNull()) {
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Ty = Context.getObjCObjectPointerType(Ty);
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} else if (getLangOptions().NoConstantCFStrings) {
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IdentifierInfo *NSIdent = &Context.Idents.get("NSConstantString");
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NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLocs[0],
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LookupOrdinaryName);
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if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
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Context.setObjCConstantStringInterface(StrIF);
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Ty = Context.getObjCConstantStringInterface();
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Ty = Context.getObjCObjectPointerType(Ty);
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} else {
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// If there is no NSConstantString interface defined then treat this
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// as error and recover from it.
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Diag(S->getLocStart(), diag::err_no_nsconstant_string_class) << NSIdent
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<< S->getSourceRange();
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Ty = Context.getObjCIdType();
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}
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} else {
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IdentifierInfo *NSIdent = &Context.Idents.get("NSString");
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NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLocs[0],
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LookupOrdinaryName);
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if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
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Context.setObjCConstantStringInterface(StrIF);
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Ty = Context.getObjCConstantStringInterface();
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Ty = Context.getObjCObjectPointerType(Ty);
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} else {
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// If there is no NSString interface defined then treat constant
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// strings as untyped objects and let the runtime figure it out later.
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Ty = Context.getObjCIdType();
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}
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}
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return new (Context) ObjCStringLiteral(S, Ty, AtLocs[0]);
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}
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Expr *Sema::BuildObjCEncodeExpression(SourceLocation AtLoc,
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TypeSourceInfo *EncodedTypeInfo,
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SourceLocation RParenLoc) {
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QualType EncodedType = EncodedTypeInfo->getType();
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QualType StrTy;
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if (EncodedType->isDependentType())
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StrTy = Context.DependentTy;
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else {
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std::string Str;
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Context.getObjCEncodingForType(EncodedType, Str);
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// The type of @encode is the same as the type of the corresponding string,
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// which is an array type.
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StrTy = Context.CharTy;
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// A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
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if (getLangOptions().CPlusPlus || getLangOptions().ConstStrings)
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StrTy.addConst();
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StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1),
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ArrayType::Normal, 0);
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}
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return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc);
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}
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Sema::ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc,
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SourceLocation EncodeLoc,
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SourceLocation LParenLoc,
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TypeTy *ty,
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SourceLocation RParenLoc) {
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// FIXME: Preserve type source info ?
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TypeSourceInfo *TInfo;
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QualType EncodedType = GetTypeFromParser(ty, &TInfo);
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if (!TInfo)
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TInfo = Context.getTrivialTypeSourceInfo(EncodedType,
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PP.getLocForEndOfToken(LParenLoc));
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return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc);
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}
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Sema::ExprResult Sema::ParseObjCSelectorExpression(Selector Sel,
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SourceLocation AtLoc,
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SourceLocation SelLoc,
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SourceLocation LParenLoc,
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SourceLocation RParenLoc) {
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ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel,
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SourceRange(LParenLoc, RParenLoc), false);
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if (!Method)
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Method = LookupFactoryMethodInGlobalPool(Sel,
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SourceRange(LParenLoc, RParenLoc));
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if (!Method)
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Diag(SelLoc, diag::warn_undeclared_selector) << Sel;
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llvm::DenseMap<Selector, SourceLocation>::iterator Pos
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= ReferencedSelectors.find(Sel);
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if (Pos == ReferencedSelectors.end())
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ReferencedSelectors.insert(std::make_pair(Sel, SelLoc));
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QualType Ty = Context.getObjCSelType();
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return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc);
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}
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Sema::ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId,
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SourceLocation AtLoc,
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SourceLocation ProtoLoc,
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SourceLocation LParenLoc,
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SourceLocation RParenLoc) {
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ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoLoc);
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if (!PDecl) {
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Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId;
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return true;
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}
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QualType Ty = Context.getObjCProtoType();
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if (Ty.isNull())
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return true;
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Ty = Context.getObjCObjectPointerType(Ty);
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return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, RParenLoc);
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}
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bool Sema::CheckMessageArgumentTypes(Expr **Args, unsigned NumArgs,
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Selector Sel, ObjCMethodDecl *Method,
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bool isClassMessage,
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SourceLocation lbrac, SourceLocation rbrac,
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QualType &ReturnType) {
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if (!Method) {
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// Apply default argument promotion as for (C99 6.5.2.2p6).
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for (unsigned i = 0; i != NumArgs; i++) {
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if (Args[i]->isTypeDependent())
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continue;
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DefaultArgumentPromotion(Args[i]);
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}
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unsigned DiagID = isClassMessage ? diag::warn_class_method_not_found :
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diag::warn_inst_method_not_found;
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Diag(lbrac, DiagID)
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<< Sel << isClassMessage << SourceRange(lbrac, rbrac);
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ReturnType = Context.getObjCIdType();
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return false;
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}
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ReturnType = Method->getSendResultType();
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unsigned NumNamedArgs = Sel.getNumArgs();
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// Method might have more arguments than selector indicates. This is due
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// to addition of c-style arguments in method.
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if (Method->param_size() > Sel.getNumArgs())
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NumNamedArgs = Method->param_size();
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// FIXME. This need be cleaned up.
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if (NumArgs < NumNamedArgs) {
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Diag(lbrac, diag::err_typecheck_call_too_few_args) << 2
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<< NumNamedArgs << NumArgs;
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return false;
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}
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bool IsError = false;
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for (unsigned i = 0; i < NumNamedArgs; i++) {
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// We can't do any type-checking on a type-dependent argument.
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if (Args[i]->isTypeDependent())
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continue;
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Expr *argExpr = Args[i];
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ParmVarDecl *Param = Method->param_begin()[i];
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assert(argExpr && "CheckMessageArgumentTypes(): missing expression");
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if (RequireCompleteType(argExpr->getSourceRange().getBegin(),
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Param->getType(),
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PDiag(diag::err_call_incomplete_argument)
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<< argExpr->getSourceRange()))
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return true;
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InitializedEntity Entity = InitializedEntity::InitializeParameter(Param);
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OwningExprResult ArgE = PerformCopyInitialization(Entity,
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SourceLocation(),
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Owned(argExpr->Retain()));
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if (ArgE.isInvalid())
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IsError = true;
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else
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Args[i] = ArgE.takeAs<Expr>();
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}
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// Promote additional arguments to variadic methods.
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if (Method->isVariadic()) {
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for (unsigned i = NumNamedArgs; i < NumArgs; ++i) {
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if (Args[i]->isTypeDependent())
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continue;
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IsError |= DefaultVariadicArgumentPromotion(Args[i], VariadicMethod, 0);
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}
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} else {
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// Check for extra arguments to non-variadic methods.
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if (NumArgs != NumNamedArgs) {
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Diag(Args[NumNamedArgs]->getLocStart(),
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diag::err_typecheck_call_too_many_args)
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<< 2 /*method*/ << NumNamedArgs << NumArgs
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<< Method->getSourceRange()
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<< SourceRange(Args[NumNamedArgs]->getLocStart(),
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Args[NumArgs-1]->getLocEnd());
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}
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}
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DiagnoseSentinelCalls(Method, lbrac, Args, NumArgs);
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return IsError;
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}
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bool Sema::isSelfExpr(Expr *RExpr) {
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if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(RExpr))
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if (DRE->getDecl()->getIdentifier() == &Context.Idents.get("self"))
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return true;
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return false;
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}
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// Helper method for ActOnClassMethod/ActOnInstanceMethod.
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// Will search "local" class/category implementations for a method decl.
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// If failed, then we search in class's root for an instance method.
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// Returns 0 if no method is found.
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ObjCMethodDecl *Sema::LookupPrivateClassMethod(Selector Sel,
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ObjCInterfaceDecl *ClassDecl) {
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ObjCMethodDecl *Method = 0;
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// lookup in class and all superclasses
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while (ClassDecl && !Method) {
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if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation())
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Method = ImpDecl->getClassMethod(Sel);
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// Look through local category implementations associated with the class.
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if (!Method)
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Method = ClassDecl->getCategoryClassMethod(Sel);
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// Before we give up, check if the selector is an instance method.
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// But only in the root. This matches gcc's behaviour and what the
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// runtime expects.
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if (!Method && !ClassDecl->getSuperClass()) {
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Method = ClassDecl->lookupInstanceMethod(Sel);
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// Look through local category implementations associated
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// with the root class.
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if (!Method)
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Method = LookupPrivateInstanceMethod(Sel, ClassDecl);
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}
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ClassDecl = ClassDecl->getSuperClass();
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}
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return Method;
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}
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ObjCMethodDecl *Sema::LookupPrivateInstanceMethod(Selector Sel,
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ObjCInterfaceDecl *ClassDecl) {
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ObjCMethodDecl *Method = 0;
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while (ClassDecl && !Method) {
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// If we have implementations in scope, check "private" methods.
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if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation())
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Method = ImpDecl->getInstanceMethod(Sel);
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// Look through local category implementations associated with the class.
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if (!Method)
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Method = ClassDecl->getCategoryInstanceMethod(Sel);
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ClassDecl = ClassDecl->getSuperClass();
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}
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return Method;
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}
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/// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an
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/// objective C interface. This is a property reference expression.
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Action::OwningExprResult Sema::
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HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
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Expr *BaseExpr, DeclarationName MemberName,
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SourceLocation MemberLoc) {
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const ObjCInterfaceType *IFaceT = OPT->getInterfaceType();
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ObjCInterfaceDecl *IFace = IFaceT->getDecl();
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IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
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// Search for a declared property first.
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if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Member)) {
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// Check whether we can reference this property.
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if (DiagnoseUseOfDecl(PD, MemberLoc))
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return ExprError();
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QualType ResTy = PD->getType();
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Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
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ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
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if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc))
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ResTy = Getter->getSendResultType();
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return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy,
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MemberLoc, BaseExpr));
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}
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// Check protocols on qualified interfaces.
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for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(),
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E = OPT->qual_end(); I != E; ++I)
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if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) {
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// Check whether we can reference this property.
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if (DiagnoseUseOfDecl(PD, MemberLoc))
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return ExprError();
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return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(),
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MemberLoc, BaseExpr));
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}
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// If that failed, look for an "implicit" property by seeing if the nullary
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// selector is implemented.
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// FIXME: The logic for looking up nullary and unary selectors should be
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// shared with the code in ActOnInstanceMessage.
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Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
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ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
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// If this reference is in an @implementation, check for 'private' methods.
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if (!Getter)
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Getter = IFace->lookupPrivateInstanceMethod(Sel);
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// Look through local category implementations associated with the class.
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if (!Getter)
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Getter = IFace->getCategoryInstanceMethod(Sel);
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if (Getter) {
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// Check if we can reference this property.
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if (DiagnoseUseOfDecl(Getter, MemberLoc))
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return ExprError();
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}
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// If we found a getter then this may be a valid dot-reference, we
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// will look for the matching setter, in case it is needed.
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Selector SetterSel =
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SelectorTable::constructSetterName(PP.getIdentifierTable(),
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PP.getSelectorTable(), Member);
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ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
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if (!Setter) {
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// If this reference is in an @implementation, also check for 'private'
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// methods.
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Setter = IFace->lookupPrivateInstanceMethod(SetterSel);
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}
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// Look through local category implementations associated with the class.
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if (!Setter)
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Setter = IFace->getCategoryInstanceMethod(SetterSel);
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if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
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return ExprError();
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if (Getter) {
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QualType PType;
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PType = Getter->getSendResultType();
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return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(Getter, PType,
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Setter, MemberLoc, BaseExpr));
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}
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// Attempt to correct for typos in property names.
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LookupResult Res(*this, MemberName, MemberLoc, LookupOrdinaryName);
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if (CorrectTypo(Res, 0, 0, IFace, false, CTC_NoKeywords, OPT) &&
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Res.getAsSingle<ObjCPropertyDecl>()) {
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DeclarationName TypoResult = Res.getLookupName();
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Diag(MemberLoc, diag::err_property_not_found_suggest)
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<< MemberName << QualType(OPT, 0) << TypoResult
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<< FixItHint::CreateReplacement(MemberLoc, TypoResult.getAsString());
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ObjCPropertyDecl *Property = Res.getAsSingle<ObjCPropertyDecl>();
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Diag(Property->getLocation(), diag::note_previous_decl)
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<< Property->getDeclName();
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return HandleExprPropertyRefExpr(OPT, BaseExpr, TypoResult, MemberLoc);
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}
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Diag(MemberLoc, diag::err_property_not_found)
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<< MemberName << QualType(OPT, 0);
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if (Setter && !Getter)
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Diag(Setter->getLocation(), diag::note_getter_unavailable)
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<< MemberName << BaseExpr->getSourceRange();
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return ExprError();
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}
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Action::OwningExprResult Sema::
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ActOnClassPropertyRefExpr(IdentifierInfo &receiverName,
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IdentifierInfo &propertyName,
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SourceLocation receiverNameLoc,
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SourceLocation propertyNameLoc) {
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IdentifierInfo *receiverNamePtr = &receiverName;
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ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr,
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receiverNameLoc);
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if (IFace == 0) {
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// If the "receiver" is 'super' in a method, handle it as an expression-like
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// property reference.
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if (ObjCMethodDecl *CurMethod = getCurMethodDecl())
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if (receiverNamePtr->isStr("super")) {
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if (CurMethod->isInstanceMethod()) {
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QualType T =
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Context.getObjCInterfaceType(CurMethod->getClassInterface());
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T = Context.getObjCObjectPointerType(T);
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Expr *SuperExpr = new (Context) ObjCSuperExpr(receiverNameLoc, T);
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return HandleExprPropertyRefExpr(T->getAsObjCInterfacePointerType(),
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SuperExpr, &propertyName,
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propertyNameLoc);
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}
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// Otherwise, if this is a class method, try dispatching to our
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// superclass.
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IFace = CurMethod->getClassInterface()->getSuperClass();
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}
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if (IFace == 0) {
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Diag(receiverNameLoc, diag::err_expected_ident_or_lparen);
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return ExprError();
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}
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}
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// Search for a declared property first.
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Selector Sel = PP.getSelectorTable().getNullarySelector(&propertyName);
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ObjCMethodDecl *Getter = IFace->lookupClassMethod(Sel);
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// If this reference is in an @implementation, check for 'private' methods.
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if (!Getter)
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if (ObjCMethodDecl *CurMeth = getCurMethodDecl())
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if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface())
|
|
if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation())
|
|
Getter = ImpDecl->getClassMethod(Sel);
|
|
|
|
if (Getter) {
|
|
// FIXME: refactor/share with ActOnMemberReference().
|
|
// Check if we can reference this property.
|
|
if (DiagnoseUseOfDecl(Getter, propertyNameLoc))
|
|
return ExprError();
|
|
}
|
|
|
|
// Look for the matching setter, in case it is needed.
|
|
Selector SetterSel =
|
|
SelectorTable::constructSetterName(PP.getIdentifierTable(),
|
|
PP.getSelectorTable(), &propertyName);
|
|
|
|
ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
|
|
if (!Setter) {
|
|
// If this reference is in an @implementation, also check for 'private'
|
|
// methods.
|
|
if (ObjCMethodDecl *CurMeth = getCurMethodDecl())
|
|
if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface())
|
|
if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation())
|
|
Setter = ImpDecl->getClassMethod(SetterSel);
|
|
}
|
|
// Look through local category implementations associated with the class.
|
|
if (!Setter)
|
|
Setter = IFace->getCategoryClassMethod(SetterSel);
|
|
|
|
if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc))
|
|
return ExprError();
|
|
|
|
if (Getter || Setter) {
|
|
QualType PType;
|
|
|
|
if (Getter)
|
|
PType = Getter->getSendResultType();
|
|
else {
|
|
for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(),
|
|
E = Setter->param_end(); PI != E; ++PI)
|
|
PType = (*PI)->getType();
|
|
}
|
|
return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(
|
|
Getter, PType, Setter,
|
|
propertyNameLoc, IFace, receiverNameLoc));
|
|
}
|
|
return ExprError(Diag(propertyNameLoc, diag::err_property_not_found)
|
|
<< &propertyName << Context.getObjCInterfaceType(IFace));
|
|
}
|
|
|
|
Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S,
|
|
IdentifierInfo *Name,
|
|
SourceLocation NameLoc,
|
|
bool IsSuper,
|
|
bool HasTrailingDot,
|
|
TypeTy *&ReceiverType) {
|
|
ReceiverType = 0;
|
|
|
|
// If the identifier is "super" and there is no trailing dot, we're
|
|
// messaging super.
|
|
if (IsSuper && !HasTrailingDot && S->isInObjcMethodScope())
|
|
return ObjCSuperMessage;
|
|
|
|
LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
|
|
LookupName(Result, S);
|
|
|
|
switch (Result.getResultKind()) {
|
|
case LookupResult::NotFound:
|
|
// Normal name lookup didn't find anything. If we're in an
|
|
// Objective-C method, look for ivars. If we find one, we're done!
|
|
// FIXME: This is a hack. Ivar lookup should be part of normal lookup.
|
|
if (ObjCMethodDecl *Method = getCurMethodDecl()) {
|
|
ObjCInterfaceDecl *ClassDeclared;
|
|
if (Method->getClassInterface()->lookupInstanceVariable(Name,
|
|
ClassDeclared))
|
|
return ObjCInstanceMessage;
|
|
}
|
|
|
|
// Break out; we'll perform typo correction below.
|
|
break;
|
|
|
|
case LookupResult::NotFoundInCurrentInstantiation:
|
|
case LookupResult::FoundOverloaded:
|
|
case LookupResult::FoundUnresolvedValue:
|
|
case LookupResult::Ambiguous:
|
|
Result.suppressDiagnostics();
|
|
return ObjCInstanceMessage;
|
|
|
|
case LookupResult::Found: {
|
|
// We found something. If it's a type, then we have a class
|
|
// message. Otherwise, it's an instance message.
|
|
NamedDecl *ND = Result.getFoundDecl();
|
|
QualType T;
|
|
if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND))
|
|
T = Context.getObjCInterfaceType(Class);
|
|
else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND))
|
|
T = Context.getTypeDeclType(Type);
|
|
else
|
|
return ObjCInstanceMessage;
|
|
|
|
// We have a class message, and T is the type we're
|
|
// messaging. Build source-location information for it.
|
|
TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
|
|
ReceiverType = CreateLocInfoType(T, TSInfo).getAsOpaquePtr();
|
|
return ObjCClassMessage;
|
|
}
|
|
}
|
|
|
|
// Determine our typo-correction context.
|
|
CorrectTypoContext CTC = CTC_Expression;
|
|
if (ObjCMethodDecl *Method = getCurMethodDecl())
|
|
if (Method->getClassInterface() &&
|
|
Method->getClassInterface()->getSuperClass())
|
|
CTC = CTC_ObjCMessageReceiver;
|
|
|
|
if (DeclarationName Corrected = CorrectTypo(Result, S, 0, 0, false, CTC)) {
|
|
if (Result.isSingleResult()) {
|
|
// If we found a declaration, correct when it refers to an Objective-C
|
|
// class.
|
|
NamedDecl *ND = Result.getFoundDecl();
|
|
if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND)) {
|
|
Diag(NameLoc, diag::err_unknown_receiver_suggest)
|
|
<< Name << Result.getLookupName()
|
|
<< FixItHint::CreateReplacement(SourceRange(NameLoc),
|
|
ND->getNameAsString());
|
|
Diag(ND->getLocation(), diag::note_previous_decl)
|
|
<< Corrected;
|
|
|
|
QualType T = Context.getObjCInterfaceType(Class);
|
|
TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
|
|
ReceiverType = CreateLocInfoType(T, TSInfo).getAsOpaquePtr();
|
|
return ObjCClassMessage;
|
|
}
|
|
} else if (Result.empty() && Corrected.getAsIdentifierInfo() &&
|
|
Corrected.getAsIdentifierInfo()->isStr("super")) {
|
|
// If we've found the keyword "super", this is a send to super.
|
|
Diag(NameLoc, diag::err_unknown_receiver_suggest)
|
|
<< Name << Corrected
|
|
<< FixItHint::CreateReplacement(SourceRange(NameLoc), "super");
|
|
Name = Corrected.getAsIdentifierInfo();
|
|
return ObjCSuperMessage;
|
|
}
|
|
}
|
|
|
|
// Fall back: let the parser try to parse it as an instance message.
|
|
return ObjCInstanceMessage;
|
|
}
|
|
|
|
Sema::OwningExprResult Sema::ActOnSuperMessage(Scope *S,
|
|
SourceLocation SuperLoc,
|
|
Selector Sel,
|
|
SourceLocation LBracLoc,
|
|
SourceLocation SelectorLoc,
|
|
SourceLocation RBracLoc,
|
|
MultiExprArg Args) {
|
|
// Determine whether we are inside a method or not.
|
|
ObjCMethodDecl *Method = getCurMethodDecl();
|
|
if (!Method) {
|
|
Diag(SuperLoc, diag::err_invalid_receiver_to_message_super);
|
|
return ExprError();
|
|
}
|
|
|
|
ObjCInterfaceDecl *Class = Method->getClassInterface();
|
|
if (!Class) {
|
|
Diag(SuperLoc, diag::error_no_super_class_message)
|
|
<< Method->getDeclName();
|
|
return ExprError();
|
|
}
|
|
|
|
ObjCInterfaceDecl *Super = Class->getSuperClass();
|
|
if (!Super) {
|
|
// The current class does not have a superclass.
|
|
Diag(SuperLoc, diag::error_no_super_class) << Class->getIdentifier();
|
|
return ExprError();
|
|
}
|
|
|
|
// We are in a method whose class has a superclass, so 'super'
|
|
// is acting as a keyword.
|
|
if (Method->isInstanceMethod()) {
|
|
// Since we are in an instance method, this is an instance
|
|
// message to the superclass instance.
|
|
QualType SuperTy = Context.getObjCInterfaceType(Super);
|
|
SuperTy = Context.getObjCObjectPointerType(SuperTy);
|
|
return BuildInstanceMessage(ExprArg(*this), SuperTy, SuperLoc,
|
|
Sel, /*Method=*/0, LBracLoc, RBracLoc,
|
|
move(Args));
|
|
}
|
|
|
|
// Since we are in a class method, this is a class message to
|
|
// the superclass.
|
|
return BuildClassMessage(/*ReceiverTypeInfo=*/0,
|
|
Context.getObjCInterfaceType(Super),
|
|
SuperLoc, Sel, /*Method=*/0, LBracLoc, RBracLoc,
|
|
move(Args));
|
|
}
|
|
|
|
/// \brief Build an Objective-C class message expression.
|
|
///
|
|
/// This routine takes care of both normal class messages and
|
|
/// class messages to the superclass.
|
|
///
|
|
/// \param ReceiverTypeInfo Type source information that describes the
|
|
/// receiver of this message. This may be NULL, in which case we are
|
|
/// sending to the superclass and \p SuperLoc must be a valid source
|
|
/// location.
|
|
|
|
/// \param ReceiverType The type of the object receiving the
|
|
/// message. When \p ReceiverTypeInfo is non-NULL, this is the same
|
|
/// type as that refers to. For a superclass send, this is the type of
|
|
/// the superclass.
|
|
///
|
|
/// \param SuperLoc The location of the "super" keyword in a
|
|
/// superclass message.
|
|
///
|
|
/// \param Sel The selector to which the message is being sent.
|
|
///
|
|
/// \param Method The method that this class message is invoking, if
|
|
/// already known.
|
|
///
|
|
/// \param LBracLoc The location of the opening square bracket ']'.
|
|
///
|
|
/// \param RBrac The location of the closing square bracket ']'.
|
|
///
|
|
/// \param Args The message arguments.
|
|
Sema::OwningExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo,
|
|
QualType ReceiverType,
|
|
SourceLocation SuperLoc,
|
|
Selector Sel,
|
|
ObjCMethodDecl *Method,
|
|
SourceLocation LBracLoc,
|
|
SourceLocation RBracLoc,
|
|
MultiExprArg ArgsIn) {
|
|
if (ReceiverType->isDependentType()) {
|
|
// If the receiver type is dependent, we can't type-check anything
|
|
// at this point. Build a dependent expression.
|
|
unsigned NumArgs = ArgsIn.size();
|
|
Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release());
|
|
assert(SuperLoc.isInvalid() && "Message to super with dependent type");
|
|
return Owned(ObjCMessageExpr::Create(Context, ReceiverType, LBracLoc,
|
|
ReceiverTypeInfo, Sel, /*Method=*/0,
|
|
Args, NumArgs, RBracLoc));
|
|
}
|
|
|
|
SourceLocation Loc = SuperLoc.isValid()? SuperLoc
|
|
: ReceiverTypeInfo->getTypeLoc().getLocalSourceRange().getBegin();
|
|
|
|
// Find the class to which we are sending this message.
|
|
ObjCInterfaceDecl *Class = 0;
|
|
const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>();
|
|
if (!ClassType || !(Class = ClassType->getInterface())) {
|
|
Diag(Loc, diag::err_invalid_receiver_class_message)
|
|
<< ReceiverType;
|
|
return ExprError();
|
|
}
|
|
assert(Class && "We don't know which class we're messaging?");
|
|
|
|
// Find the method we are messaging.
|
|
if (!Method) {
|
|
if (Class->isForwardDecl()) {
|
|
// A forward class used in messaging is treated as a 'Class'
|
|
Diag(Loc, diag::warn_receiver_forward_class) << Class->getDeclName();
|
|
Method = LookupFactoryMethodInGlobalPool(Sel,
|
|
SourceRange(LBracLoc, RBracLoc));
|
|
if (Method)
|
|
Diag(Method->getLocation(), diag::note_method_sent_forward_class)
|
|
<< Method->getDeclName();
|
|
}
|
|
if (!Method)
|
|
Method = Class->lookupClassMethod(Sel);
|
|
|
|
// If we have an implementation in scope, check "private" methods.
|
|
if (!Method)
|
|
Method = LookupPrivateClassMethod(Sel, Class);
|
|
|
|
if (Method && DiagnoseUseOfDecl(Method, Loc))
|
|
return ExprError();
|
|
}
|
|
|
|
// Check the argument types and determine the result type.
|
|
QualType ReturnType;
|
|
unsigned NumArgs = ArgsIn.size();
|
|
Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release());
|
|
if (CheckMessageArgumentTypes(Args, NumArgs, Sel, Method, true,
|
|
LBracLoc, RBracLoc, ReturnType)) {
|
|
for (unsigned I = 0; I != NumArgs; ++I)
|
|
Args[I]->Destroy(Context);
|
|
return ExprError();
|
|
}
|
|
|
|
// Construct the appropriate ObjCMessageExpr.
|
|
Expr *Result;
|
|
if (SuperLoc.isValid())
|
|
Result = ObjCMessageExpr::Create(Context, ReturnType, LBracLoc,
|
|
SuperLoc, /*IsInstanceSuper=*/false,
|
|
ReceiverType, Sel, Method, Args,
|
|
NumArgs, RBracLoc);
|
|
else
|
|
Result = ObjCMessageExpr::Create(Context, ReturnType, LBracLoc,
|
|
ReceiverTypeInfo, Sel, Method, Args,
|
|
NumArgs, RBracLoc);
|
|
return MaybeBindToTemporary(Result);
|
|
}
|
|
|
|
// ActOnClassMessage - used for both unary and keyword messages.
|
|
// ArgExprs is optional - if it is present, the number of expressions
|
|
// is obtained from Sel.getNumArgs().
|
|
Sema::OwningExprResult Sema::ActOnClassMessage(Scope *S,
|
|
TypeTy *Receiver,
|
|
Selector Sel,
|
|
SourceLocation LBracLoc,
|
|
SourceLocation SelectorLoc,
|
|
SourceLocation RBracLoc,
|
|
MultiExprArg Args) {
|
|
TypeSourceInfo *ReceiverTypeInfo;
|
|
QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo);
|
|
if (ReceiverType.isNull())
|
|
return ExprError();
|
|
|
|
|
|
if (!ReceiverTypeInfo)
|
|
ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc);
|
|
|
|
return BuildClassMessage(ReceiverTypeInfo, ReceiverType,
|
|
/*SuperLoc=*/SourceLocation(), Sel, /*Method=*/0,
|
|
LBracLoc, RBracLoc, move(Args));
|
|
}
|
|
|
|
/// \brief Build an Objective-C instance message expression.
|
|
///
|
|
/// This routine takes care of both normal instance messages and
|
|
/// instance messages to the superclass instance.
|
|
///
|
|
/// \param Receiver The expression that computes the object that will
|
|
/// receive this message. This may be empty, in which case we are
|
|
/// sending to the superclass instance and \p SuperLoc must be a valid
|
|
/// source location.
|
|
///
|
|
/// \param ReceiverType The (static) type of the object receiving the
|
|
/// message. When a \p Receiver expression is provided, this is the
|
|
/// same type as that expression. For a superclass instance send, this
|
|
/// is a pointer to the type of the superclass.
|
|
///
|
|
/// \param SuperLoc The location of the "super" keyword in a
|
|
/// superclass instance message.
|
|
///
|
|
/// \param Sel The selector to which the message is being sent.
|
|
///
|
|
/// \param Method The method that this instance message is invoking, if
|
|
/// already known.
|
|
///
|
|
/// \param LBracLoc The location of the opening square bracket ']'.
|
|
///
|
|
/// \param RBrac The location of the closing square bracket ']'.
|
|
///
|
|
/// \param Args The message arguments.
|
|
Sema::OwningExprResult Sema::BuildInstanceMessage(ExprArg ReceiverE,
|
|
QualType ReceiverType,
|
|
SourceLocation SuperLoc,
|
|
Selector Sel,
|
|
ObjCMethodDecl *Method,
|
|
SourceLocation LBracLoc,
|
|
SourceLocation RBracLoc,
|
|
MultiExprArg ArgsIn) {
|
|
// If we have a receiver expression, perform appropriate promotions
|
|
// and determine receiver type.
|
|
Expr *Receiver = ReceiverE.takeAs<Expr>();
|
|
if (Receiver) {
|
|
if (Receiver->isTypeDependent()) {
|
|
// If the receiver is type-dependent, we can't type-check anything
|
|
// at this point. Build a dependent expression.
|
|
unsigned NumArgs = ArgsIn.size();
|
|
Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release());
|
|
assert(SuperLoc.isInvalid() && "Message to super with dependent type");
|
|
return Owned(ObjCMessageExpr::Create(Context, Context.DependentTy,
|
|
LBracLoc, Receiver, Sel,
|
|
/*Method=*/0, Args, NumArgs,
|
|
RBracLoc));
|
|
}
|
|
|
|
// If necessary, apply function/array conversion to the receiver.
|
|
// C99 6.7.5.3p[7,8].
|
|
DefaultFunctionArrayLvalueConversion(Receiver);
|
|
ReceiverType = Receiver->getType();
|
|
}
|
|
|
|
// The location of the receiver.
|
|
SourceLocation Loc = SuperLoc.isValid()? SuperLoc : Receiver->getLocStart();
|
|
|
|
if (!Method) {
|
|
// Handle messages to id.
|
|
if (ReceiverType->isObjCIdType() || ReceiverType->isBlockPointerType() ||
|
|
(Receiver && Context.isObjCNSObjectType(Receiver->getType()))) {
|
|
Method = LookupInstanceMethodInGlobalPool(Sel,
|
|
SourceRange(LBracLoc, RBracLoc));
|
|
if (!Method)
|
|
Method = LookupFactoryMethodInGlobalPool(Sel,
|
|
SourceRange(LBracLoc, RBracLoc));
|
|
} else if (ReceiverType->isObjCClassType() ||
|
|
ReceiverType->isObjCQualifiedClassType()) {
|
|
// Handle messages to Class.
|
|
if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
|
|
if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) {
|
|
// First check the public methods in the class interface.
|
|
Method = ClassDecl->lookupClassMethod(Sel);
|
|
|
|
if (!Method)
|
|
Method = LookupPrivateClassMethod(Sel, ClassDecl);
|
|
|
|
// FIXME: if we still haven't found a method, we need to look in
|
|
// protocols (if we have qualifiers).
|
|
}
|
|
if (Method && DiagnoseUseOfDecl(Method, Loc))
|
|
return ExprError();
|
|
}
|
|
if (!Method) {
|
|
// If not messaging 'self', look for any factory method named 'Sel'.
|
|
if (!Receiver || !isSelfExpr(Receiver)) {
|
|
Method = LookupFactoryMethodInGlobalPool(Sel,
|
|
SourceRange(LBracLoc, RBracLoc));
|
|
if (!Method) {
|
|
// If no class (factory) method was found, check if an _instance_
|
|
// method of the same name exists in the root class only.
|
|
Method = LookupInstanceMethodInGlobalPool(Sel,
|
|
SourceRange(LBracLoc, RBracLoc));
|
|
if (Method)
|
|
if (const ObjCInterfaceDecl *ID =
|
|
dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) {
|
|
if (ID->getSuperClass())
|
|
Diag(Loc, diag::warn_root_inst_method_not_found)
|
|
<< Sel << SourceRange(LBracLoc, RBracLoc);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
ObjCInterfaceDecl* ClassDecl = 0;
|
|
|
|
// We allow sending a message to a qualified ID ("id<foo>"), which is ok as
|
|
// long as one of the protocols implements the selector (if not, warn).
|
|
if (const ObjCObjectPointerType *QIdTy
|
|
= ReceiverType->getAsObjCQualifiedIdType()) {
|
|
// Search protocols for instance methods.
|
|
for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(),
|
|
E = QIdTy->qual_end(); I != E; ++I) {
|
|
ObjCProtocolDecl *PDecl = *I;
|
|
if (PDecl && (Method = PDecl->lookupInstanceMethod(Sel)))
|
|
break;
|
|
// Since we aren't supporting "Class<foo>", look for a class method.
|
|
if (PDecl && (Method = PDecl->lookupClassMethod(Sel)))
|
|
break;
|
|
}
|
|
} else if (const ObjCObjectPointerType *OCIType
|
|
= ReceiverType->getAsObjCInterfacePointerType()) {
|
|
// We allow sending a message to a pointer to an interface (an object).
|
|
ClassDecl = OCIType->getInterfaceDecl();
|
|
// FIXME: consider using LookupInstanceMethodInGlobalPool, since it will be
|
|
// faster than the following method (which can do *many* linear searches).
|
|
// The idea is to add class info to InstanceMethodPool.
|
|
Method = ClassDecl->lookupInstanceMethod(Sel);
|
|
|
|
if (!Method) {
|
|
// Search protocol qualifiers.
|
|
for (ObjCObjectPointerType::qual_iterator QI = OCIType->qual_begin(),
|
|
E = OCIType->qual_end(); QI != E; ++QI) {
|
|
if ((Method = (*QI)->lookupInstanceMethod(Sel)))
|
|
break;
|
|
}
|
|
}
|
|
if (!Method) {
|
|
// If we have implementations in scope, check "private" methods.
|
|
Method = LookupPrivateInstanceMethod(Sel, ClassDecl);
|
|
|
|
if (!Method && (!Receiver || !isSelfExpr(Receiver))) {
|
|
// If we still haven't found a method, look in the global pool. This
|
|
// behavior isn't very desirable, however we need it for GCC
|
|
// compatibility. FIXME: should we deviate??
|
|
if (OCIType->qual_empty()) {
|
|
Method = LookupInstanceMethodInGlobalPool(Sel,
|
|
SourceRange(LBracLoc, RBracLoc));
|
|
if (Method && !OCIType->getInterfaceDecl()->isForwardDecl())
|
|
Diag(Loc, diag::warn_maynot_respond)
|
|
<< OCIType->getInterfaceDecl()->getIdentifier() << Sel;
|
|
}
|
|
}
|
|
}
|
|
if (Method && DiagnoseUseOfDecl(Method, Loc))
|
|
return ExprError();
|
|
} else if (!Context.getObjCIdType().isNull() &&
|
|
(ReceiverType->isPointerType() ||
|
|
ReceiverType->isIntegerType())) {
|
|
// Implicitly convert integers and pointers to 'id' but emit a warning.
|
|
Diag(Loc, diag::warn_bad_receiver_type)
|
|
<< ReceiverType
|
|
<< Receiver->getSourceRange();
|
|
if (ReceiverType->isPointerType())
|
|
ImpCastExprToType(Receiver, Context.getObjCIdType(),
|
|
CastExpr::CK_BitCast);
|
|
else
|
|
ImpCastExprToType(Receiver, Context.getObjCIdType(),
|
|
CastExpr::CK_IntegralToPointer);
|
|
ReceiverType = Receiver->getType();
|
|
}
|
|
else if (getLangOptions().CPlusPlus &&
|
|
!PerformContextuallyConvertToObjCId(Receiver)) {
|
|
if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Receiver)) {
|
|
Receiver = ICE->getSubExpr();
|
|
ReceiverType = Receiver->getType();
|
|
}
|
|
return BuildInstanceMessage(Owned(Receiver),
|
|
ReceiverType,
|
|
SuperLoc,
|
|
Sel,
|
|
Method,
|
|
LBracLoc,
|
|
RBracLoc,
|
|
move(ArgsIn));
|
|
} else {
|
|
// Reject other random receiver types (e.g. structs).
|
|
Diag(Loc, diag::err_bad_receiver_type)
|
|
<< ReceiverType << Receiver->getSourceRange();
|
|
return ExprError();
|
|
}
|
|
}
|
|
}
|
|
|
|
// Check the message arguments.
|
|
unsigned NumArgs = ArgsIn.size();
|
|
Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release());
|
|
QualType ReturnType;
|
|
if (CheckMessageArgumentTypes(Args, NumArgs, Sel, Method, false,
|
|
LBracLoc, RBracLoc, ReturnType))
|
|
return ExprError();
|
|
|
|
if (!ReturnType->isVoidType()) {
|
|
if (RequireCompleteType(LBracLoc, ReturnType,
|
|
diag::err_illegal_message_expr_incomplete_type))
|
|
return ExprError();
|
|
}
|
|
|
|
// Construct the appropriate ObjCMessageExpr instance.
|
|
Expr *Result;
|
|
if (SuperLoc.isValid())
|
|
Result = ObjCMessageExpr::Create(Context, ReturnType, LBracLoc,
|
|
SuperLoc, /*IsInstanceSuper=*/true,
|
|
ReceiverType, Sel, Method,
|
|
Args, NumArgs, RBracLoc);
|
|
else
|
|
Result = ObjCMessageExpr::Create(Context, ReturnType, LBracLoc, Receiver,
|
|
Sel, Method, Args, NumArgs, RBracLoc);
|
|
return MaybeBindToTemporary(Result);
|
|
}
|
|
|
|
// ActOnInstanceMessage - used for both unary and keyword messages.
|
|
// ArgExprs is optional - if it is present, the number of expressions
|
|
// is obtained from Sel.getNumArgs().
|
|
Sema::OwningExprResult Sema::ActOnInstanceMessage(Scope *S,
|
|
ExprArg ReceiverE,
|
|
Selector Sel,
|
|
SourceLocation LBracLoc,
|
|
SourceLocation SelectorLoc,
|
|
SourceLocation RBracLoc,
|
|
MultiExprArg Args) {
|
|
Expr *Receiver = static_cast<Expr *>(ReceiverE.get());
|
|
if (!Receiver)
|
|
return ExprError();
|
|
|
|
return BuildInstanceMessage(move(ReceiverE), Receiver->getType(),
|
|
/*SuperLoc=*/SourceLocation(), Sel, /*Method=*/0,
|
|
LBracLoc, RBracLoc, move(Args));
|
|
}
|
|
|