Sema.cpp revision 3cfa928f9c9bdc5a12f4c4902cd932babc9c7bc1
1//===--- Sema.cpp - AST Builder and Semantic Analysis Implementation ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the actions class which performs semantic analysis and 11// builds an AST out of a parse stream. 12// 13//===----------------------------------------------------------------------===// 14 15#include "Sema.h" 16#include "clang/AST/ASTContext.h" 17#include "clang/AST/DeclObjC.h" 18#include "clang/AST/Expr.h" 19#include "clang/Lex/Preprocessor.h" 20#include "clang/Basic/Diagnostic.h" 21using namespace clang; 22 23static inline RecordDecl *CreateStructDecl(ASTContext &C, const char *Name) { 24 if (C.getLangOptions().CPlusPlus) 25 return CXXRecordDecl::Create(C, TagDecl::TK_struct, 26 C.getTranslationUnitDecl(), 27 SourceLocation(), &C.Idents.get(Name)); 28 29 return RecordDecl::Create(C, TagDecl::TK_struct, 30 C.getTranslationUnitDecl(), 31 SourceLocation(), &C.Idents.get(Name)); 32} 33 34void Sema::ActOnTranslationUnitScope(SourceLocation Loc, Scope *S) { 35 TUScope = S; 36 PushDeclContext(Context.getTranslationUnitDecl()); 37 if (!PP.getLangOptions().ObjC1) return; 38 39 // Synthesize "typedef struct objc_selector *SEL;" 40 RecordDecl *SelTag = CreateStructDecl(Context, "objc_selector"); 41 PushOnScopeChains(SelTag, TUScope); 42 43 QualType SelT = Context.getPointerType(Context.getTagDeclType(SelTag)); 44 TypedefDecl *SelTypedef = TypedefDecl::Create(Context, CurContext, 45 SourceLocation(), 46 &Context.Idents.get("SEL"), 47 SelT, 0); 48 PushOnScopeChains(SelTypedef, TUScope); 49 Context.setObjCSelType(SelTypedef); 50 51 // FIXME: Make sure these don't leak! 52 RecordDecl *ClassTag = CreateStructDecl(Context, "objc_class"); 53 QualType ClassT = Context.getPointerType(Context.getTagDeclType(ClassTag)); 54 TypedefDecl *ClassTypedef = 55 TypedefDecl::Create(Context, CurContext, SourceLocation(), 56 &Context.Idents.get("Class"), ClassT, 0); 57 PushOnScopeChains(ClassTag, TUScope); 58 PushOnScopeChains(ClassTypedef, TUScope); 59 Context.setObjCClassType(ClassTypedef); 60 // Synthesize "@class Protocol; 61 ObjCInterfaceDecl *ProtocolDecl = 62 ObjCInterfaceDecl::Create(Context, SourceLocation(), 63 &Context.Idents.get("Protocol"), 64 SourceLocation(), true); 65 Context.setObjCProtoType(Context.getObjCInterfaceType(ProtocolDecl)); 66 PushOnScopeChains(ProtocolDecl, TUScope); 67 68 // Synthesize "typedef struct objc_object { Class isa; } *id;" 69 RecordDecl *ObjectTag = CreateStructDecl(Context, "objc_object"); 70 71 QualType ObjT = Context.getPointerType(Context.getTagDeclType(ObjectTag)); 72 PushOnScopeChains(ObjectTag, TUScope); 73 TypedefDecl *IdTypedef = TypedefDecl::Create(Context, CurContext, 74 SourceLocation(), 75 &Context.Idents.get("id"), 76 ObjT, 0); 77 PushOnScopeChains(IdTypedef, TUScope); 78 Context.setObjCIdType(IdTypedef); 79} 80 81Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer) 82 : PP(pp), Context(ctxt), Consumer(consumer), Diags(PP.getDiagnostics()), 83 SourceMgr(PP.getSourceManager()), CurContext(0), PreDeclaratorDC(0), 84 CurBlock(0), PackContext(0), IdResolver(pp.getLangOptions()) { 85 86 // Get IdentifierInfo objects for known functions for which we 87 // do extra checking. 88 IdentifierTable &IT = PP.getIdentifierTable(); 89 90 KnownFunctionIDs[id_printf] = &IT.get("printf"); 91 KnownFunctionIDs[id_fprintf] = &IT.get("fprintf"); 92 KnownFunctionIDs[id_sprintf] = &IT.get("sprintf"); 93 KnownFunctionIDs[id_sprintf_chk] = &IT.get("__builtin___sprintf_chk"); 94 KnownFunctionIDs[id_snprintf] = &IT.get("snprintf"); 95 KnownFunctionIDs[id_snprintf_chk] = &IT.get("__builtin___snprintf_chk"); 96 KnownFunctionIDs[id_asprintf] = &IT.get("asprintf"); 97 KnownFunctionIDs[id_NSLog] = &IT.get("NSLog"); 98 KnownFunctionIDs[id_vsnprintf] = &IT.get("vsnprintf"); 99 KnownFunctionIDs[id_vasprintf] = &IT.get("vasprintf"); 100 KnownFunctionIDs[id_vfprintf] = &IT.get("vfprintf"); 101 KnownFunctionIDs[id_vsprintf] = &IT.get("vsprintf"); 102 KnownFunctionIDs[id_vsprintf_chk] = &IT.get("__builtin___vsprintf_chk"); 103 KnownFunctionIDs[id_vsnprintf] = &IT.get("vsnprintf"); 104 KnownFunctionIDs[id_vsnprintf_chk] = &IT.get("__builtin___vsnprintf_chk"); 105 KnownFunctionIDs[id_vprintf] = &IT.get("vprintf"); 106 107 StdNamespace = 0; 108 TUScope = 0; 109 if (getLangOptions().CPlusPlus) 110 FieldCollector.reset(new CXXFieldCollector()); 111} 112 113/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast. 114/// If there is already an implicit cast, merge into the existing one. 115 /// If isLvalue, the result of the cast is an lvalue. 116void Sema::ImpCastExprToType(Expr *&Expr, QualType Ty, bool isLvalue) { 117 QualType ExprTy = Context.getCanonicalType(Expr->getType()); 118 QualType TypeTy = Context.getCanonicalType(Ty); 119 120 if (ExprTy == TypeTy) 121 return; 122 123 if (Expr->getType().getTypePtr()->isPointerType() && 124 Ty.getTypePtr()->isPointerType()) { 125 QualType ExprBaseType = 126 cast<PointerType>(ExprTy.getUnqualifiedType())->getPointeeType(); 127 QualType BaseType = 128 cast<PointerType>(TypeTy.getUnqualifiedType())->getPointeeType(); 129 if (ExprBaseType.getAddressSpace() != BaseType.getAddressSpace()) { 130 Diag(Expr->getExprLoc(), diag::err_implicit_pointer_address_space_cast) 131 << Expr->getSourceRange(); 132 } 133 } 134 135 if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(Expr)) { 136 ImpCast->setType(Ty); 137 ImpCast->setLvalueCast(isLvalue); 138 } else 139 Expr = new ImplicitCastExpr(Ty, Expr, isLvalue); 140} 141 142void Sema::DeleteExpr(ExprTy *E) { 143 delete static_cast<Expr*>(E); 144} 145void Sema::DeleteStmt(StmtTy *S) { 146 delete static_cast<Stmt*>(S); 147} 148 149/// ActOnEndOfTranslationUnit - This is called at the very end of the 150/// translation unit when EOF is reached and all but the top-level scope is 151/// popped. 152void Sema::ActOnEndOfTranslationUnit() { 153 154} 155 156 157//===----------------------------------------------------------------------===// 158// Helper functions. 159//===----------------------------------------------------------------------===// 160 161const LangOptions &Sema::getLangOptions() const { 162 return PP.getLangOptions(); 163} 164 165ObjCMethodDecl *Sema::getCurMethodDecl() { 166 DeclContext *DC = CurContext; 167 while (isa<BlockDecl>(DC)) 168 DC = DC->getParent(); 169 return dyn_cast<ObjCMethodDecl>(DC); 170} 171