1 //===--- ModuleBuilder.cpp - Emit LLVM Code from ASTs ---------------------===// 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 builds an AST and converts it to LLVM Code. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "clang/CodeGen/ModuleBuilder.h" 15 #include "CodeGenModule.h" 16 #include "clang/Frontend/CodeGenOptions.h" 17 #include "clang/AST/ASTContext.h" 18 #include "clang/AST/DeclObjC.h" 19 #include "clang/AST/Expr.h" 20 #include "clang/Basic/Diagnostic.h" 21 #include "clang/Basic/TargetInfo.h" 22 #include "llvm/LLVMContext.h" 23 #include "llvm/Module.h" 24 #include "llvm/Target/TargetData.h" 25 #include "llvm/ADT/OwningPtr.h" 26 using namespace clang; 27 28 namespace { 29 class CodeGeneratorImpl : public CodeGenerator { 30 DiagnosticsEngine &Diags; 31 llvm::OwningPtr<const llvm::TargetData> TD; 32 ASTContext *Ctx; 33 const CodeGenOptions CodeGenOpts; // Intentionally copied in. 34 protected: 35 llvm::OwningPtr<llvm::Module> M; 36 llvm::OwningPtr<CodeGen::CodeGenModule> Builder; 37 public: 38 CodeGeneratorImpl(DiagnosticsEngine &diags, const std::string& ModuleName, 39 const CodeGenOptions &CGO, llvm::LLVMContext& C) 40 : Diags(diags), CodeGenOpts(CGO), M(new llvm::Module(ModuleName, C)) {} 41 42 virtual ~CodeGeneratorImpl() {} 43 44 virtual llvm::Module* GetModule() { 45 return M.get(); 46 } 47 48 virtual llvm::Module* ReleaseModule() { 49 return M.take(); 50 } 51 52 virtual void Initialize(ASTContext &Context) { 53 Ctx = &Context; 54 55 M->setTargetTriple(Ctx->getTargetInfo().getTriple().getTriple()); 56 M->setDataLayout(Ctx->getTargetInfo().getTargetDescription()); 57 TD.reset(new llvm::TargetData(Ctx->getTargetInfo().getTargetDescription())); 58 Builder.reset(new CodeGen::CodeGenModule(Context, CodeGenOpts, 59 *M, *TD, Diags)); 60 } 61 62 virtual bool HandleTopLevelDecl(DeclGroupRef DG) { 63 // Make sure to emit all elements of a Decl. 64 for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I) 65 Builder->EmitTopLevelDecl(*I); 66 return true; 67 } 68 69 /// HandleTagDeclDefinition - This callback is invoked each time a TagDecl 70 /// to (e.g. struct, union, enum, class) is completed. This allows the 71 /// client hack on the type, which can occur at any point in the file 72 /// (because these can be defined in declspecs). 73 virtual void HandleTagDeclDefinition(TagDecl *D) { 74 Builder->UpdateCompletedType(D); 75 76 // In C++, we may have member functions that need to be emitted at this 77 // point. 78 if (Ctx->getLangOptions().CPlusPlus && !D->isDependentContext()) { 79 for (DeclContext::decl_iterator M = D->decls_begin(), 80 MEnd = D->decls_end(); 81 M != MEnd; ++M) 82 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(*M)) 83 if (Method->doesThisDeclarationHaveABody() && 84 (Method->hasAttr<UsedAttr>() || 85 Method->hasAttr<ConstructorAttr>())) 86 Builder->EmitTopLevelDecl(Method); 87 } 88 } 89 90 virtual void HandleTranslationUnit(ASTContext &Ctx) { 91 if (Diags.hasErrorOccurred()) { 92 M.reset(); 93 return; 94 } 95 96 if (Builder) 97 Builder->Release(); 98 } 99 100 virtual void CompleteTentativeDefinition(VarDecl *D) { 101 if (Diags.hasErrorOccurred()) 102 return; 103 104 Builder->EmitTentativeDefinition(D); 105 } 106 107 virtual void HandleVTable(CXXRecordDecl *RD, bool DefinitionRequired) { 108 if (Diags.hasErrorOccurred()) 109 return; 110 111 Builder->EmitVTable(RD, DefinitionRequired); 112 } 113 }; 114 } 115 116 CodeGenerator *clang::CreateLLVMCodeGen(DiagnosticsEngine &Diags, 117 const std::string& ModuleName, 118 const CodeGenOptions &CGO, 119 llvm::LLVMContext& C) { 120 return new CodeGeneratorImpl(Diags, ModuleName, CGO, C); 121 } 122