| //===--- Sema.cpp - AST Builder and Semantic Analysis Implementation ------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the actions class which performs semantic analysis and |
| // builds an AST out of a parse stream. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "Sema.h" |
| #include "clang/AST/ASTConsumer.h" |
| #include "clang/AST/ASTContext.h" |
| #include "clang/AST/DeclObjC.h" |
| #include "clang/AST/Expr.h" |
| #include "clang/Lex/Preprocessor.h" |
| using namespace clang; |
| |
| /// ConvertQualTypeToStringFn - This function is used to pretty print the |
| /// specified QualType as a string in diagnostics. |
| static void ConvertArgToStringFn(Diagnostic::ArgumentKind Kind, intptr_t Val, |
| const char *Modifier, unsigned ModLen, |
| const char *Argument, unsigned ArgLen, |
| llvm::SmallVectorImpl<char> &Output, |
| void *Cookie) { |
| ASTContext &Context = *static_cast<ASTContext*>(Cookie); |
| |
| std::string S; |
| if (Kind == Diagnostic::ak_qualtype) { |
| assert(ModLen == 0 && ArgLen == 0 && |
| "Invalid modifier for QualType argument"); |
| |
| QualType Ty(QualType::getFromOpaquePtr(reinterpret_cast<void*>(Val))); |
| |
| // FIXME: Playing with std::string is really slow. |
| S = Ty.getAsString(); |
| |
| // If this is a sugared type (like a typedef, typeof, etc), then unwrap one |
| // level of the sugar so that the type is more obvious to the user. |
| QualType DesugaredTy = Ty->getDesugaredType(true); |
| DesugaredTy.setCVRQualifiers(DesugaredTy.getCVRQualifiers() | |
| Ty.getCVRQualifiers()); |
| |
| if (Ty != DesugaredTy && |
| // If the desugared type is a vector type, we don't want to expand it, |
| // it will turn into an attribute mess. People want their "vec4". |
| !isa<VectorType>(DesugaredTy) && |
| |
| // Don't desugar magic Objective-C types. |
| Ty.getUnqualifiedType() != Context.getObjCIdType() && |
| Ty.getUnqualifiedType() != Context.getObjCSelType() && |
| Ty.getUnqualifiedType() != Context.getObjCProtoType() && |
| Ty.getUnqualifiedType() != Context.getObjCClassType() && |
| |
| // Not va_list. |
| Ty.getUnqualifiedType() != Context.getBuiltinVaListType()) { |
| S = "'"+S+"' (aka '"; |
| S += DesugaredTy.getAsString(); |
| S += "')"; |
| Output.append(S.begin(), S.end()); |
| return; |
| } |
| |
| } else if (Kind == Diagnostic::ak_declarationname) { |
| |
| DeclarationName N = DeclarationName::getFromOpaqueInteger(Val); |
| S = N.getAsString(); |
| |
| if (ModLen == 9 && !memcmp(Modifier, "objcclass", 9) && ArgLen == 0) |
| S = '+' + S; |
| else if (ModLen == 12 && !memcmp(Modifier, "objcinstance", 12) && ArgLen==0) |
| S = '-' + S; |
| else |
| assert(ModLen == 0 && ArgLen == 0 && |
| "Invalid modifier for DeclarationName argument"); |
| } else { |
| assert(Kind == Diagnostic::ak_nameddecl); |
| if (ModLen == 1 && Modifier[0] == 'q' && ArgLen == 0) |
| S = reinterpret_cast<NamedDecl*>(Val)->getQualifiedNameAsString(); |
| else { |
| assert(ModLen == 0 && ArgLen == 0 && |
| "Invalid modifier for NamedDecl* argument"); |
| S = reinterpret_cast<NamedDecl*>(Val)->getNameAsString(); |
| } |
| } |
| |
| Output.push_back('\''); |
| Output.append(S.begin(), S.end()); |
| Output.push_back('\''); |
| } |
| |
| |
| static inline RecordDecl *CreateStructDecl(ASTContext &C, const char *Name) { |
| if (C.getLangOptions().CPlusPlus) |
| return CXXRecordDecl::Create(C, TagDecl::TK_struct, |
| C.getTranslationUnitDecl(), |
| SourceLocation(), &C.Idents.get(Name)); |
| |
| return RecordDecl::Create(C, TagDecl::TK_struct, |
| C.getTranslationUnitDecl(), |
| SourceLocation(), &C.Idents.get(Name)); |
| } |
| |
| void Sema::ActOnTranslationUnitScope(SourceLocation Loc, Scope *S) { |
| TUScope = S; |
| PushDeclContext(S, Context.getTranslationUnitDecl()); |
| if (!PP.getLangOptions().ObjC1) return; |
| |
| if (Context.getObjCSelType().isNull()) { |
| // Synthesize "typedef struct objc_selector *SEL;" |
| RecordDecl *SelTag = CreateStructDecl(Context, "objc_selector"); |
| PushOnScopeChains(SelTag, TUScope); |
| |
| QualType SelT = Context.getPointerType(Context.getTagDeclType(SelTag)); |
| TypedefDecl *SelTypedef = TypedefDecl::Create(Context, CurContext, |
| SourceLocation(), |
| &Context.Idents.get("SEL"), |
| SelT); |
| PushOnScopeChains(SelTypedef, TUScope); |
| Context.setObjCSelType(Context.getTypeDeclType(SelTypedef)); |
| } |
| |
| if (Context.getObjCClassType().isNull()) { |
| RecordDecl *ClassTag = CreateStructDecl(Context, "objc_class"); |
| QualType ClassT = Context.getPointerType(Context.getTagDeclType(ClassTag)); |
| TypedefDecl *ClassTypedef = |
| TypedefDecl::Create(Context, CurContext, SourceLocation(), |
| &Context.Idents.get("Class"), ClassT); |
| PushOnScopeChains(ClassTag, TUScope); |
| PushOnScopeChains(ClassTypedef, TUScope); |
| Context.setObjCClassType(Context.getTypeDeclType(ClassTypedef)); |
| } |
| |
| // Synthesize "@class Protocol; |
| if (Context.getObjCProtoType().isNull()) { |
| ObjCInterfaceDecl *ProtocolDecl = |
| ObjCInterfaceDecl::Create(Context, CurContext, SourceLocation(), |
| &Context.Idents.get("Protocol"), |
| SourceLocation(), true); |
| Context.setObjCProtoType(Context.getObjCInterfaceType(ProtocolDecl)); |
| PushOnScopeChains(ProtocolDecl, TUScope); |
| } |
| |
| // Synthesize "typedef struct objc_object { Class isa; } *id;" |
| if (Context.getObjCIdType().isNull()) { |
| RecordDecl *ObjectTag = CreateStructDecl(Context, "objc_object"); |
| |
| QualType ObjT = Context.getPointerType(Context.getTagDeclType(ObjectTag)); |
| PushOnScopeChains(ObjectTag, TUScope); |
| TypedefDecl *IdTypedef = TypedefDecl::Create(Context, CurContext, |
| SourceLocation(), |
| &Context.Idents.get("id"), |
| ObjT); |
| PushOnScopeChains(IdTypedef, TUScope); |
| Context.setObjCIdType(Context.getTypeDeclType(IdTypedef)); |
| } |
| } |
| |
| Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer, |
| bool CompleteTranslationUnit) |
| : LangOpts(pp.getLangOptions()), PP(pp), Context(ctxt), Consumer(consumer), |
| Diags(PP.getDiagnostics()), SourceMgr(PP.getSourceManager()), |
| ExternalSource(0), CurContext(0), PreDeclaratorDC(0), |
| CurBlock(0), PackContext(0), IdResolver(pp.getLangOptions()), |
| GlobalNewDeleteDeclared(false), |
| CompleteTranslationUnit(CompleteTranslationUnit) { |
| |
| StdNamespace = 0; |
| TUScope = 0; |
| if (getLangOptions().CPlusPlus) |
| FieldCollector.reset(new CXXFieldCollector()); |
| |
| // Tell diagnostics how to render things from the AST library. |
| PP.getDiagnostics().SetArgToStringFn(ConvertArgToStringFn, &Context); |
| } |
| |
| /// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast. |
| /// If there is already an implicit cast, merge into the existing one. |
| /// If isLvalue, the result of the cast is an lvalue. |
| void Sema::ImpCastExprToType(Expr *&Expr, QualType Ty, bool isLvalue) { |
| QualType ExprTy = Context.getCanonicalType(Expr->getType()); |
| QualType TypeTy = Context.getCanonicalType(Ty); |
| |
| if (ExprTy == TypeTy) |
| return; |
| |
| if (Expr->getType().getTypePtr()->isPointerType() && |
| Ty.getTypePtr()->isPointerType()) { |
| QualType ExprBaseType = |
| cast<PointerType>(ExprTy.getUnqualifiedType())->getPointeeType(); |
| QualType BaseType = |
| cast<PointerType>(TypeTy.getUnqualifiedType())->getPointeeType(); |
| if (ExprBaseType.getAddressSpace() != BaseType.getAddressSpace()) { |
| Diag(Expr->getExprLoc(), diag::err_implicit_pointer_address_space_cast) |
| << Expr->getSourceRange(); |
| } |
| } |
| |
| if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(Expr)) { |
| ImpCast->setType(Ty); |
| ImpCast->setLvalueCast(isLvalue); |
| } else |
| Expr = new (Context) ImplicitCastExpr(Ty, Expr, isLvalue); |
| } |
| |
| void Sema::DeleteExpr(ExprTy *E) { |
| if (E) static_cast<Expr*>(E)->Destroy(Context); |
| } |
| void Sema::DeleteStmt(StmtTy *S) { |
| if (S) static_cast<Stmt*>(S)->Destroy(Context); |
| } |
| |
| /// ActOnEndOfTranslationUnit - This is called at the very end of the |
| /// translation unit when EOF is reached and all but the top-level scope is |
| /// popped. |
| void Sema::ActOnEndOfTranslationUnit() { |
| if (!CompleteTranslationUnit) |
| return; |
| |
| // C99 6.9.2p2: |
| // A declaration of an identifier for an object that has file |
| // scope without an initializer, and without a storage-class |
| // specifier or with the storage-class specifier static, |
| // constitutes a tentative definition. If a translation unit |
| // contains one or more tentative definitions for an identifier, |
| // and the translation unit contains no external definition for |
| // that identifier, then the behavior is exactly as if the |
| // translation unit contains a file scope declaration of that |
| // identifier, with the composite type as of the end of the |
| // translation unit, with an initializer equal to 0. |
| for (llvm::DenseMap<DeclarationName, VarDecl *>::iterator |
| D = TentativeDefinitions.begin(), |
| DEnd = TentativeDefinitions.end(); |
| D != DEnd; ++D) { |
| VarDecl *VD = D->second; |
| |
| if (VD->isInvalidDecl() || !VD->isTentativeDefinition(Context)) |
| continue; |
| |
| if (const IncompleteArrayType *ArrayT |
| = Context.getAsIncompleteArrayType(VD->getType())) { |
| if (RequireCompleteType(VD->getLocation(), |
| ArrayT->getElementType(), |
| diag::err_tentative_def_incomplete_type_arr)) |
| VD->setInvalidDecl(); |
| else { |
| // Set the length of the array to 1 (C99 6.9.2p5). |
| Diag(VD->getLocation(), diag::warn_tentative_incomplete_array); |
| llvm::APInt One(Context.getTypeSize(Context.getSizeType()), |
| true); |
| QualType T |
| = Context.getConstantArrayType(ArrayT->getElementType(), |
| One, ArrayType::Normal, 0); |
| VD->setType(T); |
| } |
| } else if (RequireCompleteType(VD->getLocation(), VD->getType(), |
| diag::err_tentative_def_incomplete_type)) |
| VD->setInvalidDecl(); |
| |
| // Notify the consumer that we've completed a tentative definition. |
| if (!VD->isInvalidDecl()) |
| Consumer.CompleteTentativeDefinition(VD); |
| |
| } |
| } |
| |
| |
| //===----------------------------------------------------------------------===// |
| // Helper functions. |
| //===----------------------------------------------------------------------===// |
| |
| /// getCurFunctionDecl - If inside of a function body, this returns a pointer |
| /// to the function decl for the function being parsed. If we're currently |
| /// in a 'block', this returns the containing context. |
| FunctionDecl *Sema::getCurFunctionDecl() { |
| DeclContext *DC = CurContext; |
| while (isa<BlockDecl>(DC)) |
| DC = DC->getParent(); |
| return dyn_cast<FunctionDecl>(DC); |
| } |
| |
| ObjCMethodDecl *Sema::getCurMethodDecl() { |
| DeclContext *DC = CurContext; |
| while (isa<BlockDecl>(DC)) |
| DC = DC->getParent(); |
| return dyn_cast<ObjCMethodDecl>(DC); |
| } |
| |
| NamedDecl *Sema::getCurFunctionOrMethodDecl() { |
| DeclContext *DC = CurContext; |
| while (isa<BlockDecl>(DC)) |
| DC = DC->getParent(); |
| if (isa<ObjCMethodDecl>(DC) || isa<FunctionDecl>(DC)) |
| return cast<NamedDecl>(DC); |
| return 0; |
| } |
| |
| Sema::SemaDiagnosticBuilder::~SemaDiagnosticBuilder() { |
| this->Emit(); |
| |
| // If this is not a note, and we're in a template instantiation |
| // that is different from the last template instantiation where |
| // we emitted an error, print a template instantiation |
| // backtrace. |
| if (!SemaRef.Diags.isBuiltinNote(DiagID) && |
| !SemaRef.ActiveTemplateInstantiations.empty() && |
| SemaRef.ActiveTemplateInstantiations.back() |
| != SemaRef.LastTemplateInstantiationErrorContext) { |
| SemaRef.PrintInstantiationStack(); |
| SemaRef.LastTemplateInstantiationErrorContext |
| = SemaRef.ActiveTemplateInstantiations.back(); |
| } |
| } |