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/AST/ASTContext.h" 17 #include "clang/AST/Decl.h" 18 using namespace clang; 19 20 //===----------------------------------------------------------------------===// 21 // LLVM Emitter 22 23 #include "clang/Basic/Diagnostic.h" 24 #include "clang/Basic/TargetInfo.h" 25 #include "clang/CodeGen/ModuleBuilder.h" 26 #include "llvm/Module.h" 27 #include "llvm/Target/TargetData.h" 28 #include "llvm/Target/TargetMachine.h" 29 #include "llvm/Support/Compiler.h" 30 #include "llvm/ADT/OwningPtr.h" 31 32 33 namespace { 34 class VISIBILITY_HIDDEN CodeGeneratorImpl : public CodeGenerator { 35 Diagnostic &Diags; 36 llvm::OwningPtr<const llvm::TargetData> TD; 37 ASTContext *Ctx; 38 const LangOptions &Features; 39 bool GenerateDebugInfo; 40 protected: 41 llvm::OwningPtr<llvm::Module> M; 42 llvm::OwningPtr<CodeGen::CodeGenModule> Builder; 43 public: 44 CodeGeneratorImpl(Diagnostic &diags, const LangOptions &LO, 45 const std::string& ModuleName, 46 bool DebugInfoFlag) 47 : Diags(diags), Features(LO), GenerateDebugInfo(DebugInfoFlag), 48 M(new llvm::Module(ModuleName)) {} 49 50 virtual ~CodeGeneratorImpl() {} 51 52 virtual llvm::Module* ReleaseModule() { 53 return M.take(); 54 } 55 56 virtual void Initialize(ASTContext &Context) { 57 Ctx = &Context; 58 59 M->setTargetTriple(Ctx->Target.getTargetTriple()); 60 M->setDataLayout(Ctx->Target.getTargetDescription()); 61 TD.reset(new llvm::TargetData(Ctx->Target.getTargetDescription())); 62 Builder.reset(new CodeGen::CodeGenModule(Context, Features, *M, *TD, 63 Diags, GenerateDebugInfo, 64 false)); 65 } 66 67 virtual void HandleTopLevelDecl(Decl *D) { 68 // If an error occurred, stop code generation, but continue parsing and 69 // semantic analysis (to ensure all warnings and errors are emitted). 70 if (Diags.hasErrorOccurred()) 71 return; 72 73 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 74 Builder->EmitGlobal(FD); 75 } else if (VarDecl *VD = dyn_cast<VarDecl>(D)) { 76 Builder->EmitGlobal(VD); 77 } else if (isa<ObjCClassDecl>(D)){ 78 //Forward declaration. Only used for type checking. 79 } else if (ObjCProtocolDecl *PD = dyn_cast<ObjCProtocolDecl>(D)){ 80 // Generate Protocol object. 81 Builder->EmitObjCProtocolImplementation(PD); 82 } else if (isa<ObjCCategoryDecl>(D)){ 83 //Only used for typechecking. 84 } else if (ObjCCategoryImplDecl *OCD = dyn_cast<ObjCCategoryImplDecl>(D)){ 85 // Generate methods, attach to category structure 86 Builder->EmitObjCCategoryImpl(OCD); 87 } else if (ObjCImplementationDecl * OID = 88 dyn_cast<ObjCImplementationDecl>(D)){ 89 // Generate methods, attach to class structure 90 Builder->EmitObjCClassImplementation(OID); 91 } else if (isa<ObjCInterfaceDecl>(D)){ 92 // Ignore - generated when the implementation decl is CodeGen'd 93 } else if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D)){ 94 Builder->EmitObjCMethod(OMD); 95 } else if (isa<ObjCClassDecl>(D) || isa<ObjCCategoryDecl>(D)) { 96 // Forward declaration. Only used for type checking. 97 } else if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D)){ 98 Builder->EmitObjCMethod(OMD); 99 } else if (LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(D)) { 100 if (LSD->getLanguage() == LinkageSpecDecl::lang_cxx) 101 Builder->WarnUnsupported(LSD, "linkage spec"); 102 // FIXME: implement C++ linkage, C linkage works mostly by C 103 // language reuse already. 104 } else if (FileScopeAsmDecl *AD = dyn_cast<FileScopeAsmDecl>(D)) { 105 std::string AsmString(AD->getAsmString()->getStrData(), 106 AD->getAsmString()->getByteLength()); 107 108 const std::string &S = Builder->getModule().getModuleInlineAsm(); 109 if (S.empty()) 110 Builder->getModule().setModuleInlineAsm(AsmString); 111 else 112 Builder->getModule().setModuleInlineAsm(S + '\n' + AsmString); 113 } else { 114 assert(isa<TypeDecl>(D) && "Unknown top level decl"); 115 // TODO: handle debug info? 116 } 117 118 if (ScopedDecl *SD = dyn_cast<ScopedDecl>(D)) { 119 SD = SD->getNextDeclarator(); 120 if (SD) 121 HandleTopLevelDecl(SD); 122 } 123 } 124 125 /// HandleTagDeclDefinition - This callback is invoked each time a TagDecl 126 /// (e.g. struct, union, enum, class) is completed. This allows the client to 127 /// hack on the type, which can occur at any point in the file (because these 128 /// can be defined in declspecs). 129 virtual void HandleTagDeclDefinition(TagDecl *D) { 130 Builder->UpdateCompletedType(D); 131 } 132 133 virtual void HandleTranslationUnit(TranslationUnit& TU) { 134 if (Diags.hasErrorOccurred()) { 135 M.reset(); 136 return; 137 } 138 139 if (Builder) 140 Builder->Release(); 141 }; 142 }; 143 } 144 145 CodeGenerator *clang::CreateLLVMCodeGen(Diagnostic &Diags, 146 const LangOptions &Features, 147 const std::string& ModuleName, 148 bool GenerateDebugInfo) { 149 return new CodeGeneratorImpl(Diags, Features, ModuleName, GenerateDebugInfo); 150 } 151