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 } 65 66 virtual void HandleTopLevelDecl(Decl *D) { 67 // If an error occurred, stop code generation, but continue parsing and 68 // semantic analysis (to ensure all warnings and errors are emitted). 69 if (Diags.hasErrorOccurred()) 70 return; 71 72 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 73 Builder->EmitGlobal(FD); 74 } else if (VarDecl *VD = dyn_cast<VarDecl>(D)) { 75 Builder->EmitGlobal(VD); 76 } else if (isa<ObjCClassDecl>(D)){ 77 //Forward declaration. Only used for type checking. 78 } else if (ObjCProtocolDecl *PD = dyn_cast<ObjCProtocolDecl>(D)){ 79 // Generate Protocol object. 80 Builder->EmitObjCProtocolImplementation(PD); 81 } else if (isa<ObjCCategoryDecl>(D)){ 82 //Only used for typechecking. 83 } else if (ObjCCategoryImplDecl *OCD = dyn_cast<ObjCCategoryImplDecl>(D)){ 84 // Generate methods, attach to category structure 85 Builder->EmitObjCCategoryImpl(OCD); 86 } else if (ObjCImplementationDecl * OID = 87 dyn_cast<ObjCImplementationDecl>(D)){ 88 // Generate methods, attach to class structure 89 Builder->EmitObjCClassImplementation(OID); 90 } else if (isa<ObjCInterfaceDecl>(D)){ 91 // Ignore - generated when the implementation decl is CodeGen'd 92 } else if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D)){ 93 Builder->EmitObjCMethod(OMD); 94 } else if (isa<ObjCClassDecl>(D) || isa<ObjCCategoryDecl>(D)) { 95 // Forward declaration. Only used for type checking. 96 } else if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D)){ 97 Builder->EmitObjCMethod(OMD); 98 } else if (LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(D)) { 99 if (LSD->getLanguage() == LinkageSpecDecl::lang_cxx) 100 Builder->WarnUnsupported(LSD, "linkage spec"); 101 // FIXME: implement C++ linkage, C linkage works mostly by C 102 // language reuse already. 103 } else if (FileScopeAsmDecl *AD = dyn_cast<FileScopeAsmDecl>(D)) { 104 std::string AsmString(AD->getAsmString()->getStrData(), 105 AD->getAsmString()->getByteLength()); 106 107 const std::string &S = Builder->getModule().getModuleInlineAsm(); 108 if (S.empty()) 109 Builder->getModule().setModuleInlineAsm(AsmString); 110 else 111 Builder->getModule().setModuleInlineAsm(S + '\n' + AsmString); 112 } else { 113 assert(isa<TypeDecl>(D) && "Unknown top level decl"); 114 // TODO: handle debug info? 115 } 116 117 if (ScopedDecl *SD = dyn_cast<ScopedDecl>(D)) { 118 SD = SD->getNextDeclarator(); 119 if (SD) 120 HandleTopLevelDecl(SD); 121 } 122 } 123 124 /// HandleTagDeclDefinition - This callback is invoked each time a TagDecl 125 /// (e.g. struct, union, enum, class) is completed. This allows the client to 126 /// hack on the type, which can occur at any point in the file (because these 127 /// can be defined in declspecs). 128 virtual void HandleTagDeclDefinition(TagDecl *D) { 129 Builder->UpdateCompletedType(D); 130 } 131 132 virtual void HandleTranslationUnit(TranslationUnit& TU) { 133 if (Diags.hasErrorOccurred()) { 134 M.reset(); 135 return; 136 } 137 138 if (Builder) 139 Builder->Release(); 140 }; 141 }; 142 } 143 144 CodeGenerator *clang::CreateLLVMCodeGen(Diagnostic &Diags, 145 const LangOptions &Features, 146 const std::string& ModuleName, 147 bool GenerateDebugInfo) { 148 return new CodeGeneratorImpl(Diags, Features, ModuleName, GenerateDebugInfo); 149 } 150