Sema.cpp revision 500d3297d2a21edeac4d46cbcbe21bc2352c2a28
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" 20using namespace clang; 21 22/// ConvertQualTypeToStringFn - This function is used to pretty print the 23/// specified QualType as a string in diagnostics. 24static void ConvertArgToStringFn(Diagnostic::ArgumentKind Kind, intptr_t Val, 25 const char *Modifier, unsigned ModLen, 26 const char *Argument, unsigned ArgLen, 27 llvm::SmallVectorImpl<char> &Output) { 28 29 std::string S; 30 if (Kind == Diagnostic::ak_qualtype) { 31 QualType Ty(QualType::getFromOpaquePtr(reinterpret_cast<void*>(Val))); 32 33 // FIXME: Playing with std::string is really slow. 34 S = Ty.getAsString(); 35 36 assert(ModLen == 0 && ArgLen == 0 && 37 "Invalid modifier for QualType argument"); 38 39 } else { 40 assert(Kind == Diagnostic::ak_declarationname); 41 42 DeclarationName N = DeclarationName::getFromOpaqueInteger(Val); 43 S = N.getAsString(); 44 45 if (ModLen == 9 && !memcmp(Modifier, "objcclass", 9) && ArgLen == 0) 46 S = '+' + S; 47 else if (ModLen == 12 && !memcmp(Modifier, "objcinstance", 12) && ArgLen==0) 48 S = '-' + S; 49 else 50 assert(ModLen == 0 && ArgLen == 0 && 51 "Invalid modifier for DeclarationName argument"); 52 } 53 Output.append(S.begin(), S.end()); 54} 55 56 57static inline RecordDecl *CreateStructDecl(ASTContext &C, const char *Name) { 58 if (C.getLangOptions().CPlusPlus) 59 return CXXRecordDecl::Create(C, TagDecl::TK_struct, 60 C.getTranslationUnitDecl(), 61 SourceLocation(), &C.Idents.get(Name)); 62 63 return RecordDecl::Create(C, TagDecl::TK_struct, 64 C.getTranslationUnitDecl(), 65 SourceLocation(), &C.Idents.get(Name)); 66} 67 68void Sema::ActOnTranslationUnitScope(SourceLocation Loc, Scope *S) { 69 TUScope = S; 70 PushDeclContext(S, Context.getTranslationUnitDecl()); 71 if (!PP.getLangOptions().ObjC1) return; 72 73 // Synthesize "typedef struct objc_selector *SEL;" 74 RecordDecl *SelTag = CreateStructDecl(Context, "objc_selector"); 75 PushOnScopeChains(SelTag, TUScope); 76 77 QualType SelT = Context.getPointerType(Context.getTagDeclType(SelTag)); 78 TypedefDecl *SelTypedef = TypedefDecl::Create(Context, CurContext, 79 SourceLocation(), 80 &Context.Idents.get("SEL"), 81 SelT); 82 PushOnScopeChains(SelTypedef, TUScope); 83 Context.setObjCSelType(SelTypedef); 84 85 // FIXME: Make sure these don't leak! 86 RecordDecl *ClassTag = CreateStructDecl(Context, "objc_class"); 87 QualType ClassT = Context.getPointerType(Context.getTagDeclType(ClassTag)); 88 TypedefDecl *ClassTypedef = 89 TypedefDecl::Create(Context, CurContext, SourceLocation(), 90 &Context.Idents.get("Class"), ClassT); 91 PushOnScopeChains(ClassTag, TUScope); 92 PushOnScopeChains(ClassTypedef, TUScope); 93 Context.setObjCClassType(ClassTypedef); 94 // Synthesize "@class Protocol; 95 ObjCInterfaceDecl *ProtocolDecl = 96 ObjCInterfaceDecl::Create(Context, CurContext, SourceLocation(), 97 &Context.Idents.get("Protocol"), 98 SourceLocation(), true); 99 Context.setObjCProtoType(Context.getObjCInterfaceType(ProtocolDecl)); 100 PushOnScopeChains(ProtocolDecl, TUScope); 101 102 // Synthesize "typedef struct objc_object { Class isa; } *id;" 103 RecordDecl *ObjectTag = CreateStructDecl(Context, "objc_object"); 104 105 QualType ObjT = Context.getPointerType(Context.getTagDeclType(ObjectTag)); 106 PushOnScopeChains(ObjectTag, TUScope); 107 TypedefDecl *IdTypedef = TypedefDecl::Create(Context, CurContext, 108 SourceLocation(), 109 &Context.Idents.get("id"), 110 ObjT); 111 PushOnScopeChains(IdTypedef, TUScope); 112 Context.setObjCIdType(IdTypedef); 113} 114 115Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer) 116 : LangOpts(pp.getLangOptions()), PP(pp), Context(ctxt), Consumer(consumer), 117 Diags(PP.getDiagnostics()), 118 SourceMgr(PP.getSourceManager()), CurContext(0), PreDeclaratorDC(0), 119 CurBlock(0), PackContext(0), IdResolver(pp.getLangOptions()), 120 GlobalNewDeleteDeclared(false) { 121 122 // Get IdentifierInfo objects for known functions for which we 123 // do extra checking. 124 IdentifierTable &IT = PP.getIdentifierTable(); 125 126 KnownFunctionIDs[id_printf] = &IT.get("printf"); 127 KnownFunctionIDs[id_fprintf] = &IT.get("fprintf"); 128 KnownFunctionIDs[id_sprintf] = &IT.get("sprintf"); 129 KnownFunctionIDs[id_sprintf_chk] = &IT.get("__builtin___sprintf_chk"); 130 KnownFunctionIDs[id_snprintf] = &IT.get("snprintf"); 131 KnownFunctionIDs[id_snprintf_chk] = &IT.get("__builtin___snprintf_chk"); 132 KnownFunctionIDs[id_asprintf] = &IT.get("asprintf"); 133 KnownFunctionIDs[id_NSLog] = &IT.get("NSLog"); 134 KnownFunctionIDs[id_vsnprintf] = &IT.get("vsnprintf"); 135 KnownFunctionIDs[id_vasprintf] = &IT.get("vasprintf"); 136 KnownFunctionIDs[id_vfprintf] = &IT.get("vfprintf"); 137 KnownFunctionIDs[id_vsprintf] = &IT.get("vsprintf"); 138 KnownFunctionIDs[id_vsprintf_chk] = &IT.get("__builtin___vsprintf_chk"); 139 KnownFunctionIDs[id_vsnprintf] = &IT.get("vsnprintf"); 140 KnownFunctionIDs[id_vsnprintf_chk] = &IT.get("__builtin___vsnprintf_chk"); 141 KnownFunctionIDs[id_vprintf] = &IT.get("vprintf"); 142 143 StdNamespace = 0; 144 TUScope = 0; 145 if (getLangOptions().CPlusPlus) 146 FieldCollector.reset(new CXXFieldCollector()); 147 148 // Tell diagnostics how to render things from the AST library. 149 PP.getDiagnostics().SetArgToStringFn(ConvertArgToStringFn); 150} 151 152/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast. 153/// If there is already an implicit cast, merge into the existing one. 154/// If isLvalue, the result of the cast is an lvalue. 155void Sema::ImpCastExprToType(Expr *&Expr, QualType Ty, bool isLvalue) { 156 QualType ExprTy = Context.getCanonicalType(Expr->getType()); 157 QualType TypeTy = Context.getCanonicalType(Ty); 158 159 if (ExprTy == TypeTy) 160 return; 161 162 if (Expr->getType().getTypePtr()->isPointerType() && 163 Ty.getTypePtr()->isPointerType()) { 164 QualType ExprBaseType = 165 cast<PointerType>(ExprTy.getUnqualifiedType())->getPointeeType(); 166 QualType BaseType = 167 cast<PointerType>(TypeTy.getUnqualifiedType())->getPointeeType(); 168 if (ExprBaseType.getAddressSpace() != BaseType.getAddressSpace()) { 169 Diag(Expr->getExprLoc(), diag::err_implicit_pointer_address_space_cast) 170 << Expr->getSourceRange(); 171 } 172 } 173 174 if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(Expr)) { 175 ImpCast->setType(Ty); 176 ImpCast->setLvalueCast(isLvalue); 177 } else 178 Expr = new ImplicitCastExpr(Ty, Expr, isLvalue); 179} 180 181void Sema::DeleteExpr(ExprTy *E) { 182 if (E) static_cast<Expr*>(E)->Destroy(Context); 183} 184void Sema::DeleteStmt(StmtTy *S) { 185 if (S) static_cast<Stmt*>(S)->Destroy(Context); 186} 187 188/// ActOnEndOfTranslationUnit - This is called at the very end of the 189/// translation unit when EOF is reached and all but the top-level scope is 190/// popped. 191void Sema::ActOnEndOfTranslationUnit() { 192 193} 194 195 196//===----------------------------------------------------------------------===// 197// Helper functions. 198//===----------------------------------------------------------------------===// 199 200/// getCurFunctionDecl - If inside of a function body, this returns a pointer 201/// to the function decl for the function being parsed. If we're currently 202/// in a 'block', this returns the containing context. 203FunctionDecl *Sema::getCurFunctionDecl() { 204 DeclContext *DC = CurContext; 205 while (isa<BlockDecl>(DC)) 206 DC = DC->getParent(); 207 return dyn_cast<FunctionDecl>(DC); 208} 209 210ObjCMethodDecl *Sema::getCurMethodDecl() { 211 DeclContext *DC = CurContext; 212 while (isa<BlockDecl>(DC)) 213 DC = DC->getParent(); 214 return dyn_cast<ObjCMethodDecl>(DC); 215} 216 217NamedDecl *Sema::getCurFunctionOrMethodDecl() { 218 DeclContext *DC = CurContext; 219 while (isa<BlockDecl>(DC)) 220 DC = DC->getParent(); 221 if (isa<ObjCMethodDecl>(DC) || isa<FunctionDecl>(DC)) 222 return cast<NamedDecl>(DC); 223 return 0; 224} 225 226