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 if (Diags.hasErrorOccurred()) 54 return 0; 55 56 if (Builder) 57 Builder->Release(); 58 59 return M.take(); 60 } 61 62 virtual void Initialize(ASTContext &Context) { 63 Ctx = &Context; 64 65 M->setTargetTriple(Ctx->Target.getTargetTriple()); 66 M->setDataLayout(Ctx->Target.getTargetDescription()); 67 TD.reset(new llvm::TargetData(Ctx->Target.getTargetDescription())); 68 Builder.reset(new CodeGen::CodeGenModule(Context, Features, *M, *TD, 69 Diags, GenerateDebugInfo)); 70 } 71 72 virtual void HandleTopLevelDecl(Decl *D) { 73 // If an error occurred, stop code generation, but continue parsing and 74 // semantic analysis (to ensure all warnings and errors are emitted). 75 if (Diags.hasErrorOccurred()) 76 return; 77 78 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 79 Builder->EmitGlobal(FD); 80 } else if (VarDecl *VD = dyn_cast<VarDecl>(D)) { 81 Builder->EmitGlobal(VD); 82 } else if (isa<ObjCClassDecl>(D)){ 83 //Forward declaration. Only used for type checking. 84 } else if (ObjCProtocolDecl *PD = dyn_cast<ObjCProtocolDecl>(D)){ 85 // Generate Protocol object. 86 Builder->EmitObjCProtocolImplementation(PD); 87 } else if (isa<ObjCCategoryDecl>(D)){ 88 //Only used for typechecking. 89 } else if (ObjCCategoryImplDecl *OCD = dyn_cast<ObjCCategoryImplDecl>(D)){ 90 // Generate methods, attach to category structure 91 Builder->EmitObjCCategoryImpl(OCD); 92 } else if (ObjCImplementationDecl * OID = 93 dyn_cast<ObjCImplementationDecl>(D)){ 94 // Generate methods, attach to class structure 95 Builder->EmitObjCClassImplementation(OID); 96 } else if (isa<ObjCInterfaceDecl>(D)){ 97 // Ignore - generated when the implementation decl is CodeGen'd 98 } else if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D)){ 99 Builder->EmitObjCMethod(OMD); 100 } else if (isa<ObjCClassDecl>(D) || isa<ObjCCategoryDecl>(D)) { 101 // Forward declaration. Only used for type checking. 102 } else if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D)){ 103 Builder->EmitObjCMethod(OMD); 104 } else if (LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(D)) { 105 if (LSD->getLanguage() == LinkageSpecDecl::lang_cxx) 106 Builder->WarnUnsupported(LSD, "linkage spec"); 107 // FIXME: implement C++ linkage, C linkage works mostly by C 108 // language reuse already. 109 } else if (FileScopeAsmDecl *AD = dyn_cast<FileScopeAsmDecl>(D)) { 110 std::string AsmString(AD->getAsmString()->getStrData(), 111 AD->getAsmString()->getByteLength()); 112 113 const std::string &S = Builder->getModule().getModuleInlineAsm(); 114 if (S.empty()) 115 Builder->getModule().setModuleInlineAsm(AsmString); 116 else 117 Builder->getModule().setModuleInlineAsm(S + '\n' + AsmString); 118 } else { 119 assert(isa<TypeDecl>(D) && "Unknown top level decl"); 120 // TODO: handle debug info? 121 } 122 123 if (ScopedDecl *SD = dyn_cast<ScopedDecl>(D)) { 124 SD = SD->getNextDeclarator(); 125 if (SD) 126 HandleTopLevelDecl(SD); 127 } 128 } 129 130 /// HandleTagDeclDefinition - This callback is invoked each time a TagDecl 131 /// (e.g. struct, union, enum, class) is completed. This allows the client to 132 /// hack on the type, which can occur at any point in the file (because these 133 /// can be defined in declspecs). 134 virtual void HandleTagDeclDefinition(TagDecl *D) { 135 Builder->UpdateCompletedType(D); 136 } 137 138 }; 139 } 140 141 CodeGenerator *clang::CreateLLVMCodeGen(Diagnostic &Diags, 142 const LangOptions &Features, 143 const std::string& ModuleName, 144 bool GenerateDebugInfo) { 145 return new CodeGeneratorImpl(Diags, Features, ModuleName, GenerateDebugInfo); 146 } 147