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