| //===--- CodeGenModule.cpp - Emit LLVM Code from ASTs for a Module --------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This coordinates the per-module state used while generating code. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "CodeGenModule.h" |
| #include "CGDebugInfo.h" |
| #include "CodeGenFunction.h" |
| #include "CGCall.h" |
| #include "CGObjCRuntime.h" |
| #include "Mangle.h" |
| #include "TargetInfo.h" |
| #include "clang/CodeGen/CodeGenOptions.h" |
| #include "clang/AST/ASTContext.h" |
| #include "clang/AST/CharUnits.h" |
| #include "clang/AST/DeclObjC.h" |
| #include "clang/AST/DeclCXX.h" |
| #include "clang/AST/RecordLayout.h" |
| #include "clang/Basic/Builtins.h" |
| #include "clang/Basic/Diagnostic.h" |
| #include "clang/Basic/SourceManager.h" |
| #include "clang/Basic/TargetInfo.h" |
| #include "clang/Basic/ConvertUTF.h" |
| #include "llvm/CallingConv.h" |
| #include "llvm/Module.h" |
| #include "llvm/Intrinsics.h" |
| #include "llvm/LLVMContext.h" |
| #include "llvm/ADT/Triple.h" |
| #include "llvm/Target/TargetData.h" |
| #include "llvm/Support/CallSite.h" |
| #include "llvm/Support/ErrorHandling.h" |
| using namespace clang; |
| using namespace CodeGen; |
| |
| |
| CodeGenModule::CodeGenModule(ASTContext &C, const CodeGenOptions &CGO, |
| llvm::Module &M, const llvm::TargetData &TD, |
| Diagnostic &diags) |
| : BlockModule(C, M, TD, Types, *this), Context(C), |
| Features(C.getLangOptions()), CodeGenOpts(CGO), TheModule(M), |
| TheTargetData(TD), TheTargetCodeGenInfo(0), Diags(diags), |
| Types(C, M, TD, getTargetCodeGenInfo().getABIInfo()), |
| MangleCtx(C, diags), VTables(*this), Runtime(0), |
| CFConstantStringClassRef(0), |
| NSConstantStringClassRef(0), |
| VMContext(M.getContext()) { |
| |
| if (!Features.ObjC1) |
| Runtime = 0; |
| else if (!Features.NeXTRuntime) |
| Runtime = CreateGNUObjCRuntime(*this); |
| else if (Features.ObjCNonFragileABI) |
| Runtime = CreateMacNonFragileABIObjCRuntime(*this); |
| else |
| Runtime = CreateMacObjCRuntime(*this); |
| |
| // If debug info generation is enabled, create the CGDebugInfo object. |
| DebugInfo = CodeGenOpts.DebugInfo ? new CGDebugInfo(*this) : 0; |
| } |
| |
| CodeGenModule::~CodeGenModule() { |
| delete Runtime; |
| delete DebugInfo; |
| } |
| |
| void CodeGenModule::createObjCRuntime() { |
| if (!Features.NeXTRuntime) |
| Runtime = CreateGNUObjCRuntime(*this); |
| else if (Features.ObjCNonFragileABI) |
| Runtime = CreateMacNonFragileABIObjCRuntime(*this); |
| else |
| Runtime = CreateMacObjCRuntime(*this); |
| } |
| |
| void CodeGenModule::Release() { |
| EmitDeferred(); |
| EmitCXXGlobalInitFunc(); |
| EmitCXXGlobalDtorFunc(); |
| if (Runtime) |
| if (llvm::Function *ObjCInitFunction = Runtime->ModuleInitFunction()) |
| AddGlobalCtor(ObjCInitFunction); |
| EmitCtorList(GlobalCtors, "llvm.global_ctors"); |
| EmitCtorList(GlobalDtors, "llvm.global_dtors"); |
| EmitAnnotations(); |
| EmitLLVMUsed(); |
| } |
| |
| bool CodeGenModule::isTargetDarwin() const { |
| return getContext().Target.getTriple().getOS() == llvm::Triple::Darwin; |
| } |
| |
| /// ErrorUnsupported - Print out an error that codegen doesn't support the |
| /// specified stmt yet. |
| void CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type, |
| bool OmitOnError) { |
| if (OmitOnError && getDiags().hasErrorOccurred()) |
| return; |
| unsigned DiagID = getDiags().getCustomDiagID(Diagnostic::Error, |
| "cannot compile this %0 yet"); |
| std::string Msg = Type; |
| getDiags().Report(Context.getFullLoc(S->getLocStart()), DiagID) |
| << Msg << S->getSourceRange(); |
| } |
| |
| /// ErrorUnsupported - Print out an error that codegen doesn't support the |
| /// specified decl yet. |
| void CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type, |
| bool OmitOnError) { |
| if (OmitOnError && getDiags().hasErrorOccurred()) |
| return; |
| unsigned DiagID = getDiags().getCustomDiagID(Diagnostic::Error, |
| "cannot compile this %0 yet"); |
| std::string Msg = Type; |
| getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID) << Msg; |
| } |
| |
| LangOptions::VisibilityMode |
| CodeGenModule::getDeclVisibilityMode(const Decl *D) const { |
| if (const VarDecl *VD = dyn_cast<VarDecl>(D)) |
| if (VD->getStorageClass() == VarDecl::PrivateExtern) |
| return LangOptions::Hidden; |
| |
| if (const VisibilityAttr *attr = D->getAttr<VisibilityAttr>()) { |
| switch (attr->getVisibility()) { |
| default: assert(0 && "Unknown visibility!"); |
| case VisibilityAttr::DefaultVisibility: |
| return LangOptions::Default; |
| case VisibilityAttr::HiddenVisibility: |
| return LangOptions::Hidden; |
| case VisibilityAttr::ProtectedVisibility: |
| return LangOptions::Protected; |
| } |
| } |
| |
| // This decl should have the same visibility as its parent. |
| if (const DeclContext *DC = D->getDeclContext()) |
| return getDeclVisibilityMode(cast<Decl>(DC)); |
| |
| return getLangOptions().getVisibilityMode(); |
| } |
| |
| void CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV, |
| const Decl *D) const { |
| // Internal definitions always have default visibility. |
| if (GV->hasLocalLinkage()) { |
| GV->setVisibility(llvm::GlobalValue::DefaultVisibility); |
| return; |
| } |
| |
| switch (getDeclVisibilityMode(D)) { |
| default: assert(0 && "Unknown visibility!"); |
| case LangOptions::Default: |
| return GV->setVisibility(llvm::GlobalValue::DefaultVisibility); |
| case LangOptions::Hidden: |
| return GV->setVisibility(llvm::GlobalValue::HiddenVisibility); |
| case LangOptions::Protected: |
| return GV->setVisibility(llvm::GlobalValue::ProtectedVisibility); |
| } |
| } |
| |
| void CodeGenModule::getMangledName(MangleBuffer &Buffer, GlobalDecl GD) { |
| const NamedDecl *ND = cast<NamedDecl>(GD.getDecl()); |
| |
| if (const CXXConstructorDecl *D = dyn_cast<CXXConstructorDecl>(ND)) |
| return getMangledCXXCtorName(Buffer, D, GD.getCtorType()); |
| if (const CXXDestructorDecl *D = dyn_cast<CXXDestructorDecl>(ND)) |
| return getMangledCXXDtorName(Buffer, D, GD.getDtorType()); |
| |
| return getMangledName(Buffer, ND); |
| } |
| |
| /// \brief Retrieves the mangled name for the given declaration. |
| /// |
| /// If the given declaration requires a mangled name, returns an |
| /// const char* containing the mangled name. Otherwise, returns |
| /// the unmangled name. |
| /// |
| void CodeGenModule::getMangledName(MangleBuffer &Buffer, |
| const NamedDecl *ND) { |
| if (!getMangleContext().shouldMangleDeclName(ND)) { |
| assert(ND->getIdentifier() && "Attempt to mangle unnamed decl."); |
| Buffer.setString(ND->getNameAsCString()); |
| return; |
| } |
| |
| getMangleContext().mangleName(ND, Buffer.getBuffer()); |
| } |
| |
| llvm::GlobalValue *CodeGenModule::GetGlobalValue(llvm::StringRef Name) { |
| return getModule().getNamedValue(Name); |
| } |
| |
| /// AddGlobalCtor - Add a function to the list that will be called before |
| /// main() runs. |
| void CodeGenModule::AddGlobalCtor(llvm::Function * Ctor, int Priority) { |
| // FIXME: Type coercion of void()* types. |
| GlobalCtors.push_back(std::make_pair(Ctor, Priority)); |
| } |
| |
| /// AddGlobalDtor - Add a function to the list that will be called |
| /// when the module is unloaded. |
| void CodeGenModule::AddGlobalDtor(llvm::Function * Dtor, int Priority) { |
| // FIXME: Type coercion of void()* types. |
| GlobalDtors.push_back(std::make_pair(Dtor, Priority)); |
| } |
| |
| void CodeGenModule::EmitCtorList(const CtorList &Fns, const char *GlobalName) { |
| // Ctor function type is void()*. |
| llvm::FunctionType* CtorFTy = |
| llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), |
| std::vector<const llvm::Type*>(), |
| false); |
| llvm::Type *CtorPFTy = llvm::PointerType::getUnqual(CtorFTy); |
| |
| // Get the type of a ctor entry, { i32, void ()* }. |
| llvm::StructType* CtorStructTy = |
| llvm::StructType::get(VMContext, llvm::Type::getInt32Ty(VMContext), |
| llvm::PointerType::getUnqual(CtorFTy), NULL); |
| |
| // Construct the constructor and destructor arrays. |
| std::vector<llvm::Constant*> Ctors; |
| for (CtorList::const_iterator I = Fns.begin(), E = Fns.end(); I != E; ++I) { |
| std::vector<llvm::Constant*> S; |
| S.push_back(llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), |
| I->second, false)); |
| S.push_back(llvm::ConstantExpr::getBitCast(I->first, CtorPFTy)); |
| Ctors.push_back(llvm::ConstantStruct::get(CtorStructTy, S)); |
| } |
| |
| if (!Ctors.empty()) { |
| llvm::ArrayType *AT = llvm::ArrayType::get(CtorStructTy, Ctors.size()); |
| new llvm::GlobalVariable(TheModule, AT, false, |
| llvm::GlobalValue::AppendingLinkage, |
| llvm::ConstantArray::get(AT, Ctors), |
| GlobalName); |
| } |
| } |
| |
| void CodeGenModule::EmitAnnotations() { |
| if (Annotations.empty()) |
| return; |
| |
| // Create a new global variable for the ConstantStruct in the Module. |
| llvm::Constant *Array = |
| llvm::ConstantArray::get(llvm::ArrayType::get(Annotations[0]->getType(), |
| Annotations.size()), |
| Annotations); |
| llvm::GlobalValue *gv = |
| new llvm::GlobalVariable(TheModule, Array->getType(), false, |
| llvm::GlobalValue::AppendingLinkage, Array, |
| "llvm.global.annotations"); |
| gv->setSection("llvm.metadata"); |
| } |
| |
| static CodeGenModule::GVALinkage |
| GetLinkageForFunction(ASTContext &Context, const FunctionDecl *FD, |
| const LangOptions &Features) { |
| CodeGenModule::GVALinkage External = CodeGenModule::GVA_StrongExternal; |
| |
| Linkage L = FD->getLinkage(); |
| if (L == ExternalLinkage && Context.getLangOptions().CPlusPlus && |
| FD->getType()->getLinkage() == UniqueExternalLinkage) |
| L = UniqueExternalLinkage; |
| |
| switch (L) { |
| case NoLinkage: |
| case InternalLinkage: |
| case UniqueExternalLinkage: |
| return CodeGenModule::GVA_Internal; |
| |
| case ExternalLinkage: |
| switch (FD->getTemplateSpecializationKind()) { |
| case TSK_Undeclared: |
| case TSK_ExplicitSpecialization: |
| External = CodeGenModule::GVA_StrongExternal; |
| break; |
| |
| case TSK_ExplicitInstantiationDefinition: |
| return CodeGenModule::GVA_ExplicitTemplateInstantiation; |
| |
| case TSK_ExplicitInstantiationDeclaration: |
| case TSK_ImplicitInstantiation: |
| External = CodeGenModule::GVA_TemplateInstantiation; |
| break; |
| } |
| } |
| |
| if (!FD->isInlined()) |
| return External; |
| |
| if (!Features.CPlusPlus || FD->hasAttr<GNUInlineAttr>()) { |
| // GNU or C99 inline semantics. Determine whether this symbol should be |
| // externally visible. |
| if (FD->isInlineDefinitionExternallyVisible()) |
| return External; |
| |
| // C99 inline semantics, where the symbol is not externally visible. |
| return CodeGenModule::GVA_C99Inline; |
| } |
| |
| // C++0x [temp.explicit]p9: |
| // [ Note: The intent is that an inline function that is the subject of |
| // an explicit instantiation declaration will still be implicitly |
| // instantiated when used so that the body can be considered for |
| // inlining, but that no out-of-line copy of the inline function would be |
| // generated in the translation unit. -- end note ] |
| if (FD->getTemplateSpecializationKind() |
| == TSK_ExplicitInstantiationDeclaration) |
| return CodeGenModule::GVA_C99Inline; |
| |
| return CodeGenModule::GVA_CXXInline; |
| } |
| |
| llvm::GlobalValue::LinkageTypes |
| CodeGenModule::getFunctionLinkage(const FunctionDecl *D) { |
| GVALinkage Linkage = GetLinkageForFunction(getContext(), D, Features); |
| |
| if (Linkage == GVA_Internal) { |
| return llvm::Function::InternalLinkage; |
| } else if (D->hasAttr<DLLExportAttr>()) { |
| return llvm::Function::DLLExportLinkage; |
| } else if (D->hasAttr<WeakAttr>()) { |
| return llvm::Function::WeakAnyLinkage; |
| } else if (Linkage == GVA_C99Inline) { |
| // In C99 mode, 'inline' functions are guaranteed to have a strong |
| // definition somewhere else, so we can use available_externally linkage. |
| return llvm::Function::AvailableExternallyLinkage; |
| } else if (Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation) { |
| // In C++, the compiler has to emit a definition in every translation unit |
| // that references the function. We should use linkonce_odr because |
| // a) if all references in this translation unit are optimized away, we |
| // don't need to codegen it. b) if the function persists, it needs to be |
| // merged with other definitions. c) C++ has the ODR, so we know the |
| // definition is dependable. |
| return llvm::Function::LinkOnceODRLinkage; |
| } else if (Linkage == GVA_ExplicitTemplateInstantiation) { |
| // An explicit instantiation of a template has weak linkage, since |
| // explicit instantiations can occur in multiple translation units |
| // and must all be equivalent. However, we are not allowed to |
| // throw away these explicit instantiations. |
| return llvm::Function::WeakODRLinkage; |
| } else { |
| assert(Linkage == GVA_StrongExternal); |
| // Otherwise, we have strong external linkage. |
| return llvm::Function::ExternalLinkage; |
| } |
| } |
| |
| |
| /// SetFunctionDefinitionAttributes - Set attributes for a global. |
| /// |
| /// FIXME: This is currently only done for aliases and functions, but not for |
| /// variables (these details are set in EmitGlobalVarDefinition for variables). |
| void CodeGenModule::SetFunctionDefinitionAttributes(const FunctionDecl *D, |
| llvm::GlobalValue *GV) { |
| GV->setLinkage(getFunctionLinkage(D)); |
| SetCommonAttributes(D, GV); |
| } |
| |
| void CodeGenModule::SetLLVMFunctionAttributes(const Decl *D, |
| const CGFunctionInfo &Info, |
| llvm::Function *F) { |
| unsigned CallingConv; |
| AttributeListType AttributeList; |
| ConstructAttributeList(Info, D, AttributeList, CallingConv); |
| F->setAttributes(llvm::AttrListPtr::get(AttributeList.begin(), |
| AttributeList.size())); |
| F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv)); |
| } |
| |
| void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D, |
| llvm::Function *F) { |
| if (!Features.Exceptions && !Features.ObjCNonFragileABI) |
| F->addFnAttr(llvm::Attribute::NoUnwind); |
| |
| if (D->hasAttr<AlwaysInlineAttr>()) |
| F->addFnAttr(llvm::Attribute::AlwaysInline); |
| |
| if (D->hasAttr<NoInlineAttr>()) |
| F->addFnAttr(llvm::Attribute::NoInline); |
| |
| if (Features.getStackProtectorMode() == LangOptions::SSPOn) |
| F->addFnAttr(llvm::Attribute::StackProtect); |
| else if (Features.getStackProtectorMode() == LangOptions::SSPReq) |
| F->addFnAttr(llvm::Attribute::StackProtectReq); |
| |
| if (const AlignedAttr *AA = D->getAttr<AlignedAttr>()) { |
| unsigned width = Context.Target.getCharWidth(); |
| F->setAlignment(AA->getAlignment() / width); |
| while ((AA = AA->getNext<AlignedAttr>())) |
| F->setAlignment(std::max(F->getAlignment(), AA->getAlignment() / width)); |
| } |
| // C++ ABI requires 2-byte alignment for member functions. |
| if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D)) |
| F->setAlignment(2); |
| } |
| |
| void CodeGenModule::SetCommonAttributes(const Decl *D, |
| llvm::GlobalValue *GV) { |
| setGlobalVisibility(GV, D); |
| |
| if (D->hasAttr<UsedAttr>()) |
| AddUsedGlobal(GV); |
| |
| if (const SectionAttr *SA = D->getAttr<SectionAttr>()) |
| GV->setSection(SA->getName()); |
| |
| getTargetCodeGenInfo().SetTargetAttributes(D, GV, *this); |
| } |
| |
| void CodeGenModule::SetInternalFunctionAttributes(const Decl *D, |
| llvm::Function *F, |
| const CGFunctionInfo &FI) { |
| SetLLVMFunctionAttributes(D, FI, F); |
| SetLLVMFunctionAttributesForDefinition(D, F); |
| |
| F->setLinkage(llvm::Function::InternalLinkage); |
| |
| SetCommonAttributes(D, F); |
| } |
| |
| void CodeGenModule::SetFunctionAttributes(GlobalDecl GD, |
| llvm::Function *F, |
| bool IsIncompleteFunction) { |
| const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl()); |
| |
| if (!IsIncompleteFunction) |
| SetLLVMFunctionAttributes(FD, getTypes().getFunctionInfo(GD), F); |
| |
| // Only a few attributes are set on declarations; these may later be |
| // overridden by a definition. |
| |
| if (FD->hasAttr<DLLImportAttr>()) { |
| F->setLinkage(llvm::Function::DLLImportLinkage); |
| } else if (FD->hasAttr<WeakAttr>() || |
| FD->hasAttr<WeakImportAttr>()) { |
| // "extern_weak" is overloaded in LLVM; we probably should have |
| // separate linkage types for this. |
| F->setLinkage(llvm::Function::ExternalWeakLinkage); |
| } else { |
| F->setLinkage(llvm::Function::ExternalLinkage); |
| } |
| |
| if (const SectionAttr *SA = FD->getAttr<SectionAttr>()) |
| F->setSection(SA->getName()); |
| } |
| |
| void CodeGenModule::AddUsedGlobal(llvm::GlobalValue *GV) { |
| assert(!GV->isDeclaration() && |
| "Only globals with definition can force usage."); |
| LLVMUsed.push_back(GV); |
| } |
| |
| void CodeGenModule::EmitLLVMUsed() { |
| // Don't create llvm.used if there is no need. |
| if (LLVMUsed.empty()) |
| return; |
| |
| const llvm::Type *i8PTy = llvm::Type::getInt8PtrTy(VMContext); |
| |
| // Convert LLVMUsed to what ConstantArray needs. |
| std::vector<llvm::Constant*> UsedArray; |
| UsedArray.resize(LLVMUsed.size()); |
| for (unsigned i = 0, e = LLVMUsed.size(); i != e; ++i) { |
| UsedArray[i] = |
| llvm::ConstantExpr::getBitCast(cast<llvm::Constant>(&*LLVMUsed[i]), |
| i8PTy); |
| } |
| |
| if (UsedArray.empty()) |
| return; |
| llvm::ArrayType *ATy = llvm::ArrayType::get(i8PTy, UsedArray.size()); |
| |
| llvm::GlobalVariable *GV = |
| new llvm::GlobalVariable(getModule(), ATy, false, |
| llvm::GlobalValue::AppendingLinkage, |
| llvm::ConstantArray::get(ATy, UsedArray), |
| "llvm.used"); |
| |
| GV->setSection("llvm.metadata"); |
| } |
| |
| void CodeGenModule::EmitDeferred() { |
| // Emit code for any potentially referenced deferred decls. Since a |
| // previously unused static decl may become used during the generation of code |
| // for a static function, iterate until no changes are made. |
| |
| while (!DeferredDeclsToEmit.empty() || !DeferredVTables.empty()) { |
| if (!DeferredVTables.empty()) { |
| const CXXRecordDecl *RD = DeferredVTables.back(); |
| DeferredVTables.pop_back(); |
| getVTables().GenerateClassData(getVTableLinkage(RD), RD); |
| continue; |
| } |
| |
| GlobalDecl D = DeferredDeclsToEmit.back(); |
| DeferredDeclsToEmit.pop_back(); |
| |
| // Look it up to see if it was defined with a stronger definition (e.g. an |
| // extern inline function with a strong function redefinition). If so, |
| // just ignore the deferred decl. |
| MangleBuffer Name; |
| getMangledName(Name, D); |
| llvm::GlobalValue *CGRef = GetGlobalValue(Name); |
| assert(CGRef && "Deferred decl wasn't referenced?"); |
| |
| if (!CGRef->isDeclaration()) |
| continue; |
| |
| // Otherwise, emit the definition and move on to the next one. |
| EmitGlobalDefinition(D); |
| } |
| } |
| |
| /// EmitAnnotateAttr - Generate the llvm::ConstantStruct which contains the |
| /// annotation information for a given GlobalValue. The annotation struct is |
| /// {i8 *, i8 *, i8 *, i32}. The first field is a constant expression, the |
| /// GlobalValue being annotated. The second field is the constant string |
| /// created from the AnnotateAttr's annotation. The third field is a constant |
| /// string containing the name of the translation unit. The fourth field is |
| /// the line number in the file of the annotated value declaration. |
| /// |
| /// FIXME: this does not unique the annotation string constants, as llvm-gcc |
| /// appears to. |
| /// |
| llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV, |
| const AnnotateAttr *AA, |
| unsigned LineNo) { |
| llvm::Module *M = &getModule(); |
| |
| // get [N x i8] constants for the annotation string, and the filename string |
| // which are the 2nd and 3rd elements of the global annotation structure. |
| const llvm::Type *SBP = llvm::Type::getInt8PtrTy(VMContext); |
| llvm::Constant *anno = llvm::ConstantArray::get(VMContext, |
| AA->getAnnotation(), true); |
| llvm::Constant *unit = llvm::ConstantArray::get(VMContext, |
| M->getModuleIdentifier(), |
| true); |
| |
| // Get the two global values corresponding to the ConstantArrays we just |
| // created to hold the bytes of the strings. |
| llvm::GlobalValue *annoGV = |
| new llvm::GlobalVariable(*M, anno->getType(), false, |
| llvm::GlobalValue::PrivateLinkage, anno, |
| GV->getName()); |
| // translation unit name string, emitted into the llvm.metadata section. |
| llvm::GlobalValue *unitGV = |
| new llvm::GlobalVariable(*M, unit->getType(), false, |
| llvm::GlobalValue::PrivateLinkage, unit, |
| ".str"); |
| |
| // Create the ConstantStruct for the global annotation. |
| llvm::Constant *Fields[4] = { |
| llvm::ConstantExpr::getBitCast(GV, SBP), |
| llvm::ConstantExpr::getBitCast(annoGV, SBP), |
| llvm::ConstantExpr::getBitCast(unitGV, SBP), |
| llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), LineNo) |
| }; |
| return llvm::ConstantStruct::get(VMContext, Fields, 4, false); |
| } |
| |
| bool CodeGenModule::MayDeferGeneration(const ValueDecl *Global) { |
| // Never defer when EmitAllDecls is specified or the decl has |
| // attribute used. |
| if (Features.EmitAllDecls || Global->hasAttr<UsedAttr>()) |
| return false; |
| |
| if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) { |
| // Constructors and destructors should never be deferred. |
| if (FD->hasAttr<ConstructorAttr>() || |
| FD->hasAttr<DestructorAttr>()) |
| return false; |
| |
| // The key function for a class must never be deferred. |
| if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Global)) { |
| const CXXRecordDecl *RD = MD->getParent(); |
| if (MD->isOutOfLine() && RD->isDynamicClass()) { |
| const CXXMethodDecl *KeyFunction = getContext().getKeyFunction(RD); |
| if (KeyFunction && |
| KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) |
| return false; |
| } |
| } |
| |
| GVALinkage Linkage = GetLinkageForFunction(getContext(), FD, Features); |
| |
| // static, static inline, always_inline, and extern inline functions can |
| // always be deferred. Normal inline functions can be deferred in C99/C++. |
| // Implicit template instantiations can also be deferred in C++. |
| if (Linkage == GVA_Internal || Linkage == GVA_C99Inline || |
| Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation) |
| return true; |
| return false; |
| } |
| |
| const VarDecl *VD = cast<VarDecl>(Global); |
| assert(VD->isFileVarDecl() && "Invalid decl"); |
| |
| // We never want to defer structs that have non-trivial constructors or |
| // destructors. |
| |
| // FIXME: Handle references. |
| if (const RecordType *RT = VD->getType()->getAs<RecordType>()) { |
| if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) { |
| if (!RD->hasTrivialConstructor() || !RD->hasTrivialDestructor()) |
| return false; |
| } |
| } |
| |
| // Static data may be deferred, but out-of-line static data members |
| // cannot be. |
| Linkage L = VD->getLinkage(); |
| if (L == ExternalLinkage && getContext().getLangOptions().CPlusPlus && |
| VD->getType()->getLinkage() == UniqueExternalLinkage) |
| L = UniqueExternalLinkage; |
| |
| switch (L) { |
| case NoLinkage: |
| case InternalLinkage: |
| case UniqueExternalLinkage: |
| // Initializer has side effects? |
| if (VD->getInit() && VD->getInit()->HasSideEffects(Context)) |
| return false; |
| return !(VD->isStaticDataMember() && VD->isOutOfLine()); |
| |
| case ExternalLinkage: |
| break; |
| } |
| |
| return false; |
| } |
| |
| llvm::Constant *CodeGenModule::GetWeakRefReference(const ValueDecl *VD) { |
| const AliasAttr *AA = VD->getAttr<AliasAttr>(); |
| assert(AA && "No alias?"); |
| |
| const llvm::Type *DeclTy = getTypes().ConvertTypeForMem(VD->getType()); |
| |
| // See if there is already something with the target's name in the module. |
| llvm::GlobalValue *Entry = GetGlobalValue(AA->getAliasee()); |
| |
| llvm::Constant *Aliasee; |
| if (isa<llvm::FunctionType>(DeclTy)) |
| Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GlobalDecl()); |
| else |
| Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(), |
| llvm::PointerType::getUnqual(DeclTy), 0); |
| if (!Entry) { |
| llvm::GlobalValue* F = cast<llvm::GlobalValue>(Aliasee); |
| F->setLinkage(llvm::Function::ExternalWeakLinkage); |
| WeakRefReferences.insert(F); |
| } |
| |
| return Aliasee; |
| } |
| |
| void CodeGenModule::EmitGlobal(GlobalDecl GD) { |
| const ValueDecl *Global = cast<ValueDecl>(GD.getDecl()); |
| |
| // Weak references don't produce any output by themselves. |
| if (Global->hasAttr<WeakRefAttr>()) |
| return; |
| |
| // If this is an alias definition (which otherwise looks like a declaration) |
| // emit it now. |
| if (Global->hasAttr<AliasAttr>()) |
| return EmitAliasDefinition(GD); |
| |
| // Ignore declarations, they will be emitted on their first use. |
| if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) { |
| // Forward declarations are emitted lazily on first use. |
| if (!FD->isThisDeclarationADefinition()) |
| return; |
| } else { |
| const VarDecl *VD = cast<VarDecl>(Global); |
| assert(VD->isFileVarDecl() && "Cannot emit local var decl as global."); |
| |
| if (VD->isThisDeclarationADefinition() != VarDecl::Definition) |
| return; |
| } |
| |
| // Defer code generation when possible if this is a static definition, inline |
| // function etc. These we only want to emit if they are used. |
| if (!MayDeferGeneration(Global)) { |
| // Emit the definition if it can't be deferred. |
| EmitGlobalDefinition(GD); |
| return; |
| } |
| |
| // If the value has already been used, add it directly to the |
| // DeferredDeclsToEmit list. |
| MangleBuffer MangledName; |
| getMangledName(MangledName, GD); |
| if (GetGlobalValue(MangledName)) |
| DeferredDeclsToEmit.push_back(GD); |
| else { |
| // Otherwise, remember that we saw a deferred decl with this name. The |
| // first use of the mangled name will cause it to move into |
| // DeferredDeclsToEmit. |
| DeferredDecls[MangledName] = GD; |
| } |
| } |
| |
| void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD) { |
| const ValueDecl *D = cast<ValueDecl>(GD.getDecl()); |
| |
| PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(), |
| Context.getSourceManager(), |
| "Generating code for declaration"); |
| |
| if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) |
| if (Method->isVirtual()) |
| getVTables().EmitThunks(GD); |
| |
| if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) |
| return EmitCXXConstructor(CD, GD.getCtorType()); |
| |
| if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(D)) |
| return EmitCXXDestructor(DD, GD.getDtorType()); |
| |
| if (isa<FunctionDecl>(D)) |
| return EmitGlobalFunctionDefinition(GD); |
| |
| if (const VarDecl *VD = dyn_cast<VarDecl>(D)) |
| return EmitGlobalVarDefinition(VD); |
| |
| assert(0 && "Invalid argument to EmitGlobalDefinition()"); |
| } |
| |
| /// GetOrCreateLLVMFunction - If the specified mangled name is not in the |
| /// module, create and return an llvm Function with the specified type. If there |
| /// is something in the module with the specified name, return it potentially |
| /// bitcasted to the right type. |
| /// |
| /// If D is non-null, it specifies a decl that correspond to this. This is used |
| /// to set the attributes on the function when it is first created. |
| llvm::Constant * |
| CodeGenModule::GetOrCreateLLVMFunction(llvm::StringRef MangledName, |
| const llvm::Type *Ty, |
| GlobalDecl D) { |
| // Lookup the entry, lazily creating it if necessary. |
| llvm::GlobalValue *Entry = GetGlobalValue(MangledName); |
| if (Entry) { |
| if (WeakRefReferences.count(Entry)) { |
| const FunctionDecl *FD = cast_or_null<FunctionDecl>(D.getDecl()); |
| if (FD && !FD->hasAttr<WeakAttr>()) |
| Entry->setLinkage(llvm::Function::ExternalLinkage); |
| |
| WeakRefReferences.erase(Entry); |
| } |
| |
| if (Entry->getType()->getElementType() == Ty) |
| return Entry; |
| |
| // Make sure the result is of the correct type. |
| const llvm::Type *PTy = llvm::PointerType::getUnqual(Ty); |
| return llvm::ConstantExpr::getBitCast(Entry, PTy); |
| } |
| |
| // This function doesn't have a complete type (for example, the return |
| // type is an incomplete struct). Use a fake type instead, and make |
| // sure not to try to set attributes. |
| bool IsIncompleteFunction = false; |
| |
| const llvm::FunctionType *FTy; |
| if (isa<llvm::FunctionType>(Ty)) { |
| FTy = cast<llvm::FunctionType>(Ty); |
| } else { |
| FTy = llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), |
| std::vector<const llvm::Type*>(), false); |
| IsIncompleteFunction = true; |
| } |
| llvm::Function *F = llvm::Function::Create(FTy, |
| llvm::Function::ExternalLinkage, |
| MangledName, &getModule()); |
| assert(F->getName() == MangledName && "name was uniqued!"); |
| if (D.getDecl()) |
| SetFunctionAttributes(D, F, IsIncompleteFunction); |
| |
| // This is the first use or definition of a mangled name. If there is a |
| // deferred decl with this name, remember that we need to emit it at the end |
| // of the file. |
| llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName); |
| if (DDI != DeferredDecls.end()) { |
| // Move the potentially referenced deferred decl to the DeferredDeclsToEmit |
| // list, and remove it from DeferredDecls (since we don't need it anymore). |
| DeferredDeclsToEmit.push_back(DDI->second); |
| DeferredDecls.erase(DDI); |
| } else if (const FunctionDecl *FD = cast_or_null<FunctionDecl>(D.getDecl())) { |
| // If this the first reference to a C++ inline function in a class, queue up |
| // the deferred function body for emission. These are not seen as |
| // top-level declarations. |
| if (FD->isThisDeclarationADefinition() && MayDeferGeneration(FD)) |
| DeferredDeclsToEmit.push_back(D); |
| // A called constructor which has no definition or declaration need be |
| // synthesized. |
| else if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) { |
| if (CD->isImplicit()) { |
| assert(CD->isUsed() && "Sema doesn't consider constructor as used."); |
| DeferredDeclsToEmit.push_back(D); |
| } |
| } else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(FD)) { |
| if (DD->isImplicit()) { |
| assert(DD->isUsed() && "Sema doesn't consider destructor as used."); |
| DeferredDeclsToEmit.push_back(D); |
| } |
| } else if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { |
| if (MD->isCopyAssignment() && MD->isImplicit()) { |
| assert(MD->isUsed() && "Sema doesn't consider CopyAssignment as used."); |
| DeferredDeclsToEmit.push_back(D); |
| } |
| } |
| } |
| |
| // Make sure the result is of the requested type. |
| if (!IsIncompleteFunction) { |
| assert(F->getType()->getElementType() == Ty); |
| return F; |
| } |
| |
| const llvm::Type *PTy = llvm::PointerType::getUnqual(Ty); |
| return llvm::ConstantExpr::getBitCast(F, PTy); |
| } |
| |
| /// GetAddrOfFunction - Return the address of the given function. If Ty is |
| /// non-null, then this function will use the specified type if it has to |
| /// create it (this occurs when we see a definition of the function). |
| llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD, |
| const llvm::Type *Ty) { |
| // If there was no specific requested type, just convert it now. |
| if (!Ty) |
| Ty = getTypes().ConvertType(cast<ValueDecl>(GD.getDecl())->getType()); |
| MangleBuffer MangledName; |
| getMangledName(MangledName, GD); |
| return GetOrCreateLLVMFunction(MangledName, Ty, GD); |
| } |
| |
| /// CreateRuntimeFunction - Create a new runtime function with the specified |
| /// type and name. |
| llvm::Constant * |
| CodeGenModule::CreateRuntimeFunction(const llvm::FunctionType *FTy, |
| llvm::StringRef Name) { |
| return GetOrCreateLLVMFunction(Name, FTy, GlobalDecl()); |
| } |
| |
| static bool DeclIsConstantGlobal(ASTContext &Context, const VarDecl *D) { |
| if (!D->getType().isConstant(Context) && !D->getType()->isReferenceType()) |
| return false; |
| if (Context.getLangOptions().CPlusPlus && |
| Context.getBaseElementType(D->getType())->getAs<RecordType>()) { |
| // FIXME: We should do something fancier here! |
| return false; |
| } |
| return true; |
| } |
| |
| /// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module, |
| /// create and return an llvm GlobalVariable with the specified type. If there |
| /// is something in the module with the specified name, return it potentially |
| /// bitcasted to the right type. |
| /// |
| /// If D is non-null, it specifies a decl that correspond to this. This is used |
| /// to set the attributes on the global when it is first created. |
| llvm::Constant * |
| CodeGenModule::GetOrCreateLLVMGlobal(llvm::StringRef MangledName, |
| const llvm::PointerType *Ty, |
| const VarDecl *D) { |
| // Lookup the entry, lazily creating it if necessary. |
| llvm::GlobalValue *Entry = GetGlobalValue(MangledName); |
| if (Entry) { |
| if (WeakRefReferences.count(Entry)) { |
| if (D && !D->hasAttr<WeakAttr>()) |
| Entry->setLinkage(llvm::Function::ExternalLinkage); |
| |
| WeakRefReferences.erase(Entry); |
| } |
| |
| if (Entry->getType() == Ty) |
| return Entry; |
| |
| // Make sure the result is of the correct type. |
| return llvm::ConstantExpr::getBitCast(Entry, Ty); |
| } |
| |
| // This is the first use or definition of a mangled name. If there is a |
| // deferred decl with this name, remember that we need to emit it at the end |
| // of the file. |
| llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName); |
| if (DDI != DeferredDecls.end()) { |
| // Move the potentially referenced deferred decl to the DeferredDeclsToEmit |
| // list, and remove it from DeferredDecls (since we don't need it anymore). |
| DeferredDeclsToEmit.push_back(DDI->second); |
| DeferredDecls.erase(DDI); |
| } |
| |
| llvm::GlobalVariable *GV = |
| new llvm::GlobalVariable(getModule(), Ty->getElementType(), false, |
| llvm::GlobalValue::ExternalLinkage, |
| 0, MangledName, 0, |
| false, Ty->getAddressSpace()); |
| |
| // Handle things which are present even on external declarations. |
| if (D) { |
| // FIXME: This code is overly simple and should be merged with other global |
| // handling. |
| GV->setConstant(DeclIsConstantGlobal(Context, D)); |
| |
| // FIXME: Merge with other attribute handling code. |
| if (D->getStorageClass() == VarDecl::PrivateExtern) |
| GV->setVisibility(llvm::GlobalValue::HiddenVisibility); |
| |
| if (D->hasAttr<WeakAttr>() || |
| D->hasAttr<WeakImportAttr>()) |
| GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage); |
| |
| GV->setThreadLocal(D->isThreadSpecified()); |
| } |
| |
| return GV; |
| } |
| |
| |
| /// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the |
| /// given global variable. If Ty is non-null and if the global doesn't exist, |
| /// then it will be greated with the specified type instead of whatever the |
| /// normal requested type would be. |
| llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D, |
| const llvm::Type *Ty) { |
| assert(D->hasGlobalStorage() && "Not a global variable"); |
| QualType ASTTy = D->getType(); |
| if (Ty == 0) |
| Ty = getTypes().ConvertTypeForMem(ASTTy); |
| |
| const llvm::PointerType *PTy = |
| llvm::PointerType::get(Ty, ASTTy.getAddressSpace()); |
| |
| MangleBuffer MangledName; |
| getMangledName(MangledName, D); |
| return GetOrCreateLLVMGlobal(MangledName, PTy, D); |
| } |
| |
| /// CreateRuntimeVariable - Create a new runtime global variable with the |
| /// specified type and name. |
| llvm::Constant * |
| CodeGenModule::CreateRuntimeVariable(const llvm::Type *Ty, |
| llvm::StringRef Name) { |
| return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), 0); |
| } |
| |
| void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) { |
| assert(!D->getInit() && "Cannot emit definite definitions here!"); |
| |
| if (MayDeferGeneration(D)) { |
| // If we have not seen a reference to this variable yet, place it |
| // into the deferred declarations table to be emitted if needed |
| // later. |
| MangleBuffer MangledName; |
| getMangledName(MangledName, D); |
| if (!GetGlobalValue(MangledName)) { |
| DeferredDecls[MangledName] = D; |
| return; |
| } |
| } |
| |
| // The tentative definition is the only definition. |
| EmitGlobalVarDefinition(D); |
| } |
| |
| void CodeGenModule::EmitVTable(CXXRecordDecl *Class, bool DefinitionRequired) { |
| if (DefinitionRequired) |
| getVTables().GenerateClassData(getVTableLinkage(Class), Class); |
| } |
| |
| llvm::GlobalVariable::LinkageTypes |
| CodeGenModule::getVTableLinkage(const CXXRecordDecl *RD) { |
| if (RD->isInAnonymousNamespace() || !RD->hasLinkage()) |
| return llvm::GlobalVariable::InternalLinkage; |
| |
| if (const CXXMethodDecl *KeyFunction |
| = RD->getASTContext().getKeyFunction(RD)) { |
| // If this class has a key function, use that to determine the linkage of |
| // the vtable. |
| const FunctionDecl *Def = 0; |
| if (KeyFunction->getBody(Def)) |
| KeyFunction = cast<CXXMethodDecl>(Def); |
| |
| switch (KeyFunction->getTemplateSpecializationKind()) { |
| case TSK_Undeclared: |
| case TSK_ExplicitSpecialization: |
| if (KeyFunction->isInlined()) |
| return llvm::GlobalVariable::WeakODRLinkage; |
| |
| return llvm::GlobalVariable::ExternalLinkage; |
| |
| case TSK_ImplicitInstantiation: |
| case TSK_ExplicitInstantiationDefinition: |
| return llvm::GlobalVariable::WeakODRLinkage; |
| |
| case TSK_ExplicitInstantiationDeclaration: |
| // FIXME: Use available_externally linkage. However, this currently |
| // breaks LLVM's build due to undefined symbols. |
| // return llvm::GlobalVariable::AvailableExternallyLinkage; |
| return llvm::GlobalVariable::WeakODRLinkage; |
| } |
| } |
| |
| switch (RD->getTemplateSpecializationKind()) { |
| case TSK_Undeclared: |
| case TSK_ExplicitSpecialization: |
| case TSK_ImplicitInstantiation: |
| case TSK_ExplicitInstantiationDefinition: |
| return llvm::GlobalVariable::WeakODRLinkage; |
| |
| case TSK_ExplicitInstantiationDeclaration: |
| // FIXME: Use available_externally linkage. However, this currently |
| // breaks LLVM's build due to undefined symbols. |
| // return llvm::GlobalVariable::AvailableExternallyLinkage; |
| return llvm::GlobalVariable::WeakODRLinkage; |
| } |
| |
| // Silence GCC warning. |
| return llvm::GlobalVariable::WeakODRLinkage; |
| } |
| |
| static CodeGenModule::GVALinkage |
| GetLinkageForVariable(ASTContext &Context, const VarDecl *VD) { |
| // If this is a static data member, compute the kind of template |
| // specialization. Otherwise, this variable is not part of a |
| // template. |
| TemplateSpecializationKind TSK = TSK_Undeclared; |
| if (VD->isStaticDataMember()) |
| TSK = VD->getTemplateSpecializationKind(); |
| |
| Linkage L = VD->getLinkage(); |
| if (L == ExternalLinkage && Context.getLangOptions().CPlusPlus && |
| VD->getType()->getLinkage() == UniqueExternalLinkage) |
| L = UniqueExternalLinkage; |
| |
| switch (L) { |
| case NoLinkage: |
| case InternalLinkage: |
| case UniqueExternalLinkage: |
| return CodeGenModule::GVA_Internal; |
| |
| case ExternalLinkage: |
| switch (TSK) { |
| case TSK_Undeclared: |
| case TSK_ExplicitSpecialization: |
| return CodeGenModule::GVA_StrongExternal; |
| |
| case TSK_ExplicitInstantiationDeclaration: |
| llvm_unreachable("Variable should not be instantiated"); |
| // Fall through to treat this like any other instantiation. |
| |
| case TSK_ExplicitInstantiationDefinition: |
| return CodeGenModule::GVA_ExplicitTemplateInstantiation; |
| |
| case TSK_ImplicitInstantiation: |
| return CodeGenModule::GVA_TemplateInstantiation; |
| } |
| } |
| |
| return CodeGenModule::GVA_StrongExternal; |
| } |
| |
| CharUnits CodeGenModule::GetTargetTypeStoreSize(const llvm::Type *Ty) const { |
| return CharUnits::fromQuantity( |
| TheTargetData.getTypeStoreSizeInBits(Ty) / Context.getCharWidth()); |
| } |
| |
| void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) { |
| llvm::Constant *Init = 0; |
| QualType ASTTy = D->getType(); |
| bool NonConstInit = false; |
| |
| const Expr *InitExpr = D->getAnyInitializer(); |
| |
| if (!InitExpr) { |
| // This is a tentative definition; tentative definitions are |
| // implicitly initialized with { 0 }. |
| // |
| // Note that tentative definitions are only emitted at the end of |
| // a translation unit, so they should never have incomplete |
| // type. In addition, EmitTentativeDefinition makes sure that we |
| // never attempt to emit a tentative definition if a real one |
| // exists. A use may still exists, however, so we still may need |
| // to do a RAUW. |
| assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type"); |
| Init = EmitNullConstant(D->getType()); |
| } else { |
| Init = EmitConstantExpr(InitExpr, D->getType()); |
| if (!Init) { |
| QualType T = InitExpr->getType(); |
| if (D->getType()->isReferenceType()) |
| T = D->getType(); |
| |
| if (getLangOptions().CPlusPlus) { |
| EmitCXXGlobalVarDeclInitFunc(D); |
| Init = EmitNullConstant(T); |
| NonConstInit = true; |
| } else { |
| ErrorUnsupported(D, "static initializer"); |
| Init = llvm::UndefValue::get(getTypes().ConvertType(T)); |
| } |
| } |
| } |
| |
| const llvm::Type* InitType = Init->getType(); |
| llvm::Constant *Entry = GetAddrOfGlobalVar(D, InitType); |
| |
| // Strip off a bitcast if we got one back. |
| if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) { |
| assert(CE->getOpcode() == llvm::Instruction::BitCast || |
| // all zero index gep. |
| CE->getOpcode() == llvm::Instruction::GetElementPtr); |
| Entry = CE->getOperand(0); |
| } |
| |
| // Entry is now either a Function or GlobalVariable. |
| llvm::GlobalVariable *GV = dyn_cast<llvm::GlobalVariable>(Entry); |
| |
| // We have a definition after a declaration with the wrong type. |
| // We must make a new GlobalVariable* and update everything that used OldGV |
| // (a declaration or tentative definition) with the new GlobalVariable* |
| // (which will be a definition). |
| // |
| // This happens if there is a prototype for a global (e.g. |
| // "extern int x[];") and then a definition of a different type (e.g. |
| // "int x[10];"). This also happens when an initializer has a different type |
| // from the type of the global (this happens with unions). |
| if (GV == 0 || |
| GV->getType()->getElementType() != InitType || |
| GV->getType()->getAddressSpace() != ASTTy.getAddressSpace()) { |
| |
| // Move the old entry aside so that we'll create a new one. |
| Entry->setName(llvm::StringRef()); |
| |
| // Make a new global with the correct type, this is now guaranteed to work. |
| GV = cast<llvm::GlobalVariable>(GetAddrOfGlobalVar(D, InitType)); |
| |
| // Replace all uses of the old global with the new global |
| llvm::Constant *NewPtrForOldDecl = |
| llvm::ConstantExpr::getBitCast(GV, Entry->getType()); |
| Entry->replaceAllUsesWith(NewPtrForOldDecl); |
| |
| // Erase the old global, since it is no longer used. |
| cast<llvm::GlobalValue>(Entry)->eraseFromParent(); |
| } |
| |
| if (const AnnotateAttr *AA = D->getAttr<AnnotateAttr>()) { |
| SourceManager &SM = Context.getSourceManager(); |
| AddAnnotation(EmitAnnotateAttr(GV, AA, |
| SM.getInstantiationLineNumber(D->getLocation()))); |
| } |
| |
| GV->setInitializer(Init); |
| |
| // If it is safe to mark the global 'constant', do so now. |
| GV->setConstant(false); |
| if (!NonConstInit && DeclIsConstantGlobal(Context, D)) |
| GV->setConstant(true); |
| |
| GV->setAlignment(getContext().getDeclAlign(D).getQuantity()); |
| |
| // Set the llvm linkage type as appropriate. |
| GVALinkage Linkage = GetLinkageForVariable(getContext(), D); |
| if (Linkage == GVA_Internal) |
| GV->setLinkage(llvm::Function::InternalLinkage); |
| else if (D->hasAttr<DLLImportAttr>()) |
| GV->setLinkage(llvm::Function::DLLImportLinkage); |
| else if (D->hasAttr<DLLExportAttr>()) |
| GV->setLinkage(llvm::Function::DLLExportLinkage); |
| else if (D->hasAttr<WeakAttr>()) { |
| if (GV->isConstant()) |
| GV->setLinkage(llvm::GlobalVariable::WeakODRLinkage); |
| else |
| GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage); |
| } else if (Linkage == GVA_TemplateInstantiation || |
| Linkage == GVA_ExplicitTemplateInstantiation) |
| // FIXME: It seems like we can provide more specific linkage here |
| // (LinkOnceODR, WeakODR). |
| GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage); |
| else if (!getLangOptions().CPlusPlus && !CodeGenOpts.NoCommon && |
| !D->hasExternalStorage() && !D->getInit() && |
| !D->getAttr<SectionAttr>()) { |
| GV->setLinkage(llvm::GlobalVariable::CommonLinkage); |
| // common vars aren't constant even if declared const. |
| GV->setConstant(false); |
| } else |
| GV->setLinkage(llvm::GlobalVariable::ExternalLinkage); |
| |
| SetCommonAttributes(D, GV); |
| |
| // Emit global variable debug information. |
| if (CGDebugInfo *DI = getDebugInfo()) { |
| DI->setLocation(D->getLocation()); |
| DI->EmitGlobalVariable(GV, D); |
| } |
| } |
| |
| /// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we |
| /// implement a function with no prototype, e.g. "int foo() {}". If there are |
| /// existing call uses of the old function in the module, this adjusts them to |
| /// call the new function directly. |
| /// |
| /// This is not just a cleanup: the always_inline pass requires direct calls to |
| /// functions to be able to inline them. If there is a bitcast in the way, it |
| /// won't inline them. Instcombine normally deletes these calls, but it isn't |
| /// run at -O0. |
| static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old, |
| llvm::Function *NewFn) { |
| // If we're redefining a global as a function, don't transform it. |
| llvm::Function *OldFn = dyn_cast<llvm::Function>(Old); |
| if (OldFn == 0) return; |
| |
| const llvm::Type *NewRetTy = NewFn->getReturnType(); |
| llvm::SmallVector<llvm::Value*, 4> ArgList; |
| |
| for (llvm::Value::use_iterator UI = OldFn->use_begin(), E = OldFn->use_end(); |
| UI != E; ) { |
| // TODO: Do invokes ever occur in C code? If so, we should handle them too. |
| llvm::Value::use_iterator I = UI++; // Increment before the CI is erased. |
| llvm::CallInst *CI = dyn_cast<llvm::CallInst>(*I); |
| llvm::CallSite CS(CI); |
| if (!CI || !CS.isCallee(I)) continue; |
| |
| // If the return types don't match exactly, and if the call isn't dead, then |
| // we can't transform this call. |
| if (CI->getType() != NewRetTy && !CI->use_empty()) |
| continue; |
| |
| // If the function was passed too few arguments, don't transform. If extra |
| // arguments were passed, we silently drop them. If any of the types |
| // mismatch, we don't transform. |
| unsigned ArgNo = 0; |
| bool DontTransform = false; |
| for (llvm::Function::arg_iterator AI = NewFn->arg_begin(), |
| E = NewFn->arg_end(); AI != E; ++AI, ++ArgNo) { |
| if (CS.arg_size() == ArgNo || |
| CS.getArgument(ArgNo)->getType() != AI->getType()) { |
| DontTransform = true; |
| break; |
| } |
| } |
| if (DontTransform) |
| continue; |
| |
| // Okay, we can transform this. Create the new call instruction and copy |
| // over the required information. |
| ArgList.append(CS.arg_begin(), CS.arg_begin() + ArgNo); |
| llvm::CallInst *NewCall = llvm::CallInst::Create(NewFn, ArgList.begin(), |
| ArgList.end(), "", CI); |
| ArgList.clear(); |
| if (!NewCall->getType()->isVoidTy()) |
| NewCall->takeName(CI); |
| NewCall->setAttributes(CI->getAttributes()); |
| NewCall->setCallingConv(CI->getCallingConv()); |
| |
| // Finally, remove the old call, replacing any uses with the new one. |
| if (!CI->use_empty()) |
| CI->replaceAllUsesWith(NewCall); |
| |
| // Copy debug location attached to CI. |
| if (!CI->getDebugLoc().isUnknown()) |
| NewCall->setDebugLoc(CI->getDebugLoc()); |
| CI->eraseFromParent(); |
| } |
| } |
| |
| |
| void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD) { |
| const FunctionDecl *D = cast<FunctionDecl>(GD.getDecl()); |
| const llvm::FunctionType *Ty = getTypes().GetFunctionType(GD); |
| getMangleContext().mangleInitDiscriminator(); |
| // Get or create the prototype for the function. |
| llvm::Constant *Entry = GetAddrOfFunction(GD, Ty); |
| |
| // Strip off a bitcast if we got one back. |
| if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) { |
| assert(CE->getOpcode() == llvm::Instruction::BitCast); |
| Entry = CE->getOperand(0); |
| } |
| |
| |
| if (cast<llvm::GlobalValue>(Entry)->getType()->getElementType() != Ty) { |
| llvm::GlobalValue *OldFn = cast<llvm::GlobalValue>(Entry); |
| |
| // If the types mismatch then we have to rewrite the definition. |
| assert(OldFn->isDeclaration() && |
| "Shouldn't replace non-declaration"); |
| |
| // F is the Function* for the one with the wrong type, we must make a new |
| // Function* and update everything that used F (a declaration) with the new |
| // Function* (which will be a definition). |
| // |
| // This happens if there is a prototype for a function |
| // (e.g. "int f()") and then a definition of a different type |
| // (e.g. "int f(int x)"). Move the old function aside so that it |
| // doesn't interfere with GetAddrOfFunction. |
| OldFn->setName(llvm::StringRef()); |
| llvm::Function *NewFn = cast<llvm::Function>(GetAddrOfFunction(GD, Ty)); |
| |
| // If this is an implementation of a function without a prototype, try to |
| // replace any existing uses of the function (which may be calls) with uses |
| // of the new function |
| if (D->getType()->isFunctionNoProtoType()) { |
| ReplaceUsesOfNonProtoTypeWithRealFunction(OldFn, NewFn); |
| OldFn->removeDeadConstantUsers(); |
| } |
| |
| // Replace uses of F with the Function we will endow with a body. |
| if (!Entry->use_empty()) { |
| llvm::Constant *NewPtrForOldDecl = |
| llvm::ConstantExpr::getBitCast(NewFn, Entry->getType()); |
| Entry->replaceAllUsesWith(NewPtrForOldDecl); |
| } |
| |
| // Ok, delete the old function now, which is dead. |
| OldFn->eraseFromParent(); |
| |
| Entry = NewFn; |
| } |
| |
| llvm::Function *Fn = cast<llvm::Function>(Entry); |
| |
| CodeGenFunction(*this).GenerateCode(D, Fn); |
| |
| SetFunctionDefinitionAttributes(D, Fn); |
| SetLLVMFunctionAttributesForDefinition(D, Fn); |
| |
| if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>()) |
| AddGlobalCtor(Fn, CA->getPriority()); |
| if (const DestructorAttr *DA = D->getAttr<DestructorAttr>()) |
| AddGlobalDtor(Fn, DA->getPriority()); |
| } |
| |
| void CodeGenModule::EmitAliasDefinition(GlobalDecl GD) { |
| const ValueDecl *D = cast<ValueDecl>(GD.getDecl()); |
| const AliasAttr *AA = D->getAttr<AliasAttr>(); |
| assert(AA && "Not an alias?"); |
| |
| MangleBuffer MangledName; |
| getMangledName(MangledName, GD); |
| |
| // If there is a definition in the module, then it wins over the alias. |
| // This is dubious, but allow it to be safe. Just ignore the alias. |
| llvm::GlobalValue *Entry = GetGlobalValue(MangledName); |
| if (Entry && !Entry->isDeclaration()) |
| return; |
| |
| const llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType()); |
| |
| // Create a reference to the named value. This ensures that it is emitted |
| // if a deferred decl. |
| llvm::Constant *Aliasee; |
| if (isa<llvm::FunctionType>(DeclTy)) |
| Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GlobalDecl()); |
| else |
| Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(), |
| llvm::PointerType::getUnqual(DeclTy), 0); |
| |
| // Create the new alias itself, but don't set a name yet. |
| llvm::GlobalValue *GA = |
| new llvm::GlobalAlias(Aliasee->getType(), |
| llvm::Function::ExternalLinkage, |
| "", Aliasee, &getModule()); |
| |
| if (Entry) { |
| assert(Entry->isDeclaration()); |
| |
| // If there is a declaration in the module, then we had an extern followed |
| // by the alias, as in: |
| // extern int test6(); |
| // ... |
| // int test6() __attribute__((alias("test7"))); |
| // |
| // Remove it and replace uses of it with the alias. |
| GA->takeName(Entry); |
| |
| Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA, |
| Entry->getType())); |
| Entry->eraseFromParent(); |
| } else { |
| GA->setName(MangledName.getString()); |
| } |
| |
| // Set attributes which are particular to an alias; this is a |
| // specialization of the attributes which may be set on a global |
| // variable/function. |
| if (D->hasAttr<DLLExportAttr>()) { |
| if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { |
| // The dllexport attribute is ignored for undefined symbols. |
| if (FD->getBody()) |
| GA->setLinkage(llvm::Function::DLLExportLinkage); |
| } else { |
| GA->setLinkage(llvm::Function::DLLExportLinkage); |
| } |
| } else if (D->hasAttr<WeakAttr>() || |
| D->hasAttr<WeakRefAttr>() || |
| D->hasAttr<WeakImportAttr>()) { |
| GA->setLinkage(llvm::Function::WeakAnyLinkage); |
| } |
| |
| SetCommonAttributes(D, GA); |
| } |
| |
| /// getBuiltinLibFunction - Given a builtin id for a function like |
| /// "__builtin_fabsf", return a Function* for "fabsf". |
| llvm::Value *CodeGenModule::getBuiltinLibFunction(const FunctionDecl *FD, |
| unsigned BuiltinID) { |
| assert((Context.BuiltinInfo.isLibFunction(BuiltinID) || |
| Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) && |
| "isn't a lib fn"); |
| |
| // Get the name, skip over the __builtin_ prefix (if necessary). |
| const char *Name = Context.BuiltinInfo.GetName(BuiltinID); |
| if (Context.BuiltinInfo.isLibFunction(BuiltinID)) |
| Name += 10; |
| |
| const llvm::FunctionType *Ty = |
| cast<llvm::FunctionType>(getTypes().ConvertType(FD->getType())); |
| |
| return GetOrCreateLLVMFunction(Name, Ty, GlobalDecl(FD)); |
| } |
| |
| llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,const llvm::Type **Tys, |
| unsigned NumTys) { |
| return llvm::Intrinsic::getDeclaration(&getModule(), |
| (llvm::Intrinsic::ID)IID, Tys, NumTys); |
| } |
| |
| |
| llvm::Function *CodeGenModule::getMemCpyFn(const llvm::Type *DestType, |
| const llvm::Type *SrcType, |
| const llvm::Type *SizeType) { |
| const llvm::Type *ArgTypes[3] = {DestType, SrcType, SizeType }; |
| return getIntrinsic(llvm::Intrinsic::memcpy, ArgTypes, 3); |
| } |
| |
| llvm::Function *CodeGenModule::getMemMoveFn(const llvm::Type *DestType, |
| const llvm::Type *SrcType, |
| const llvm::Type *SizeType) { |
| const llvm::Type *ArgTypes[3] = {DestType, SrcType, SizeType }; |
| return getIntrinsic(llvm::Intrinsic::memmove, ArgTypes, 3); |
| } |
| |
| llvm::Function *CodeGenModule::getMemSetFn(const llvm::Type *DestType, |
| const llvm::Type *SizeType) { |
| const llvm::Type *ArgTypes[2] = { DestType, SizeType }; |
| return getIntrinsic(llvm::Intrinsic::memset, ArgTypes, 2); |
| } |
| |
| static llvm::StringMapEntry<llvm::Constant*> & |
| GetConstantCFStringEntry(llvm::StringMap<llvm::Constant*> &Map, |
| const StringLiteral *Literal, |
| bool TargetIsLSB, |
| bool &IsUTF16, |
| unsigned &StringLength) { |
| unsigned NumBytes = Literal->getByteLength(); |
| |
| // Check for simple case. |
| if (!Literal->containsNonAsciiOrNull()) { |
| StringLength = NumBytes; |
| return Map.GetOrCreateValue(llvm::StringRef(Literal->getStrData(), |
| StringLength)); |
| } |
| |
| // Otherwise, convert the UTF8 literals into a byte string. |
| llvm::SmallVector<UTF16, 128> ToBuf(NumBytes); |
| const UTF8 *FromPtr = (UTF8 *)Literal->getStrData(); |
| UTF16 *ToPtr = &ToBuf[0]; |
| |
| ConversionResult Result = ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, |
| &ToPtr, ToPtr + NumBytes, |
| strictConversion); |
| |
| // Check for conversion failure. |
| if (Result != conversionOK) { |
| // FIXME: Have Sema::CheckObjCString() validate the UTF-8 string and remove |
| // this duplicate code. |
| assert(Result == sourceIllegal && "UTF-8 to UTF-16 conversion failed"); |
| StringLength = NumBytes; |
| return Map.GetOrCreateValue(llvm::StringRef(Literal->getStrData(), |
| StringLength)); |
| } |
| |
| // ConvertUTF8toUTF16 returns the length in ToPtr. |
| StringLength = ToPtr - &ToBuf[0]; |
| |
| // Render the UTF-16 string into a byte array and convert to the target byte |
| // order. |
| // |
| // FIXME: This isn't something we should need to do here. |
| llvm::SmallString<128> AsBytes; |
| AsBytes.reserve(StringLength * 2); |
| for (unsigned i = 0; i != StringLength; ++i) { |
| unsigned short Val = ToBuf[i]; |
| if (TargetIsLSB) { |
| AsBytes.push_back(Val & 0xFF); |
| AsBytes.push_back(Val >> 8); |
| } else { |
| AsBytes.push_back(Val >> 8); |
| AsBytes.push_back(Val & 0xFF); |
| } |
| } |
| // Append one extra null character, the second is automatically added by our |
| // caller. |
| AsBytes.push_back(0); |
| |
| IsUTF16 = true; |
| return Map.GetOrCreateValue(llvm::StringRef(AsBytes.data(), AsBytes.size())); |
| } |
| |
| llvm::Constant * |
| CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) { |
| unsigned StringLength = 0; |
| bool isUTF16 = false; |
| llvm::StringMapEntry<llvm::Constant*> &Entry = |
| GetConstantCFStringEntry(CFConstantStringMap, Literal, |
| getTargetData().isLittleEndian(), |
| isUTF16, StringLength); |
| |
| if (llvm::Constant *C = Entry.getValue()) |
| return C; |
| |
| llvm::Constant *Zero = |
| llvm::Constant::getNullValue(llvm::Type::getInt32Ty(VMContext)); |
| llvm::Constant *Zeros[] = { Zero, Zero }; |
| |
| // If we don't already have it, get __CFConstantStringClassReference. |
| if (!CFConstantStringClassRef) { |
| const llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy); |
| Ty = llvm::ArrayType::get(Ty, 0); |
| llvm::Constant *GV = CreateRuntimeVariable(Ty, |
| "__CFConstantStringClassReference"); |
| // Decay array -> ptr |
| CFConstantStringClassRef = |
| llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); |
| } |
| |
| QualType CFTy = getContext().getCFConstantStringType(); |
| |
| const llvm::StructType *STy = |
| cast<llvm::StructType>(getTypes().ConvertType(CFTy)); |
| |
| std::vector<llvm::Constant*> Fields(4); |
| |
| // Class pointer. |
| Fields[0] = CFConstantStringClassRef; |
| |
| // Flags. |
| const llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy); |
| Fields[1] = isUTF16 ? llvm::ConstantInt::get(Ty, 0x07d0) : |
| llvm::ConstantInt::get(Ty, 0x07C8); |
| |
| // String pointer. |
| llvm::Constant *C = llvm::ConstantArray::get(VMContext, Entry.getKey().str()); |
| |
| llvm::GlobalValue::LinkageTypes Linkage; |
| bool isConstant; |
| if (isUTF16) { |
| // FIXME: why do utf strings get "_" labels instead of "L" labels? |
| Linkage = llvm::GlobalValue::InternalLinkage; |
| // Note: -fwritable-strings doesn't make unicode CFStrings writable, but |
| // does make plain ascii ones writable. |
| isConstant = true; |
| } else { |
| Linkage = llvm::GlobalValue::PrivateLinkage; |
| isConstant = !Features.WritableStrings; |
| } |
| |
| llvm::GlobalVariable *GV = |
| new llvm::GlobalVariable(getModule(), C->getType(), isConstant, Linkage, C, |
| ".str"); |
| if (isUTF16) { |
| CharUnits Align = getContext().getTypeAlignInChars(getContext().ShortTy); |
| GV->setAlignment(Align.getQuantity()); |
| } |
| Fields[2] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); |
| |
| // String length. |
| Ty = getTypes().ConvertType(getContext().LongTy); |
| Fields[3] = llvm::ConstantInt::get(Ty, StringLength); |
| |
| // The struct. |
| C = llvm::ConstantStruct::get(STy, Fields); |
| GV = new llvm::GlobalVariable(getModule(), C->getType(), true, |
| llvm::GlobalVariable::PrivateLinkage, C, |
| "_unnamed_cfstring_"); |
| if (const char *Sect = getContext().Target.getCFStringSection()) |
| GV->setSection(Sect); |
| Entry.setValue(GV); |
| |
| return GV; |
| } |
| |
| llvm::Constant * |
| CodeGenModule::GetAddrOfConstantNSString(const StringLiteral *Literal) { |
| unsigned StringLength = 0; |
| bool isUTF16 = false; |
| llvm::StringMapEntry<llvm::Constant*> &Entry = |
| GetConstantCFStringEntry(CFConstantStringMap, Literal, |
| getTargetData().isLittleEndian(), |
| isUTF16, StringLength); |
| |
| if (llvm::Constant *C = Entry.getValue()) |
| return C; |
| |
| llvm::Constant *Zero = |
| llvm::Constant::getNullValue(llvm::Type::getInt32Ty(VMContext)); |
| llvm::Constant *Zeros[] = { Zero, Zero }; |
| |
| // If we don't already have it, get _NSConstantStringClassReference. |
| if (!NSConstantStringClassRef) { |
| const llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy); |
| Ty = llvm::ArrayType::get(Ty, 0); |
| llvm::Constant *GV = CreateRuntimeVariable(Ty, |
| Features.ObjCNonFragileABI ? |
| "OBJC_CLASS_$_NSConstantString" : |
| "_NSConstantStringClassReference"); |
| // Decay array -> ptr |
| NSConstantStringClassRef = |
| llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); |
| } |
| |
| QualType NSTy = getContext().getNSConstantStringType(); |
| |
| const llvm::StructType *STy = |
| cast<llvm::StructType>(getTypes().ConvertType(NSTy)); |
| |
| std::vector<llvm::Constant*> Fields(3); |
| |
| // Class pointer. |
| Fields[0] = NSConstantStringClassRef; |
| |
| // String pointer. |
| llvm::Constant *C = llvm::ConstantArray::get(VMContext, Entry.getKey().str()); |
| |
| llvm::GlobalValue::LinkageTypes Linkage; |
| bool isConstant; |
| if (isUTF16) { |
| // FIXME: why do utf strings get "_" labels instead of "L" labels? |
| Linkage = llvm::GlobalValue::InternalLinkage; |
| // Note: -fwritable-strings doesn't make unicode NSStrings writable, but |
| // does make plain ascii ones writable. |
| isConstant = true; |
| } else { |
| Linkage = llvm::GlobalValue::PrivateLinkage; |
| isConstant = !Features.WritableStrings; |
| } |
| |
| llvm::GlobalVariable *GV = |
| new llvm::GlobalVariable(getModule(), C->getType(), isConstant, Linkage, C, |
| ".str"); |
| if (isUTF16) { |
| CharUnits Align = getContext().getTypeAlignInChars(getContext().ShortTy); |
| GV->setAlignment(Align.getQuantity()); |
| } |
| Fields[1] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); |
| |
| // String length. |
| const llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy); |
| Fields[2] = llvm::ConstantInt::get(Ty, StringLength); |
| |
| // The struct. |
| C = llvm::ConstantStruct::get(STy, Fields); |
| GV = new llvm::GlobalVariable(getModule(), C->getType(), true, |
| llvm::GlobalVariable::PrivateLinkage, C, |
| "_unnamed_nsstring_"); |
| // FIXME. Fix section. |
| if (const char *Sect = |
| Features.ObjCNonFragileABI |
| ? getContext().Target.getNSStringNonFragileABISection() |
| : getContext().Target.getNSStringSection()) |
| GV->setSection(Sect); |
| Entry.setValue(GV); |
| |
| return GV; |
| } |
| |
| /// GetStringForStringLiteral - Return the appropriate bytes for a |
| /// string literal, properly padded to match the literal type. |
| std::string CodeGenModule::GetStringForStringLiteral(const StringLiteral *E) { |
| const char *StrData = E->getStrData(); |
| unsigned Len = E->getByteLength(); |
| |
| const ConstantArrayType *CAT = |
| getContext().getAsConstantArrayType(E->getType()); |
| assert(CAT && "String isn't pointer or array!"); |
| |
| // Resize the string to the right size. |
| std::string Str(StrData, StrData+Len); |
| uint64_t RealLen = CAT->getSize().getZExtValue(); |
| |
| if (E->isWide()) |
| RealLen *= getContext().Target.getWCharWidth()/8; |
| |
| Str.resize(RealLen, '\0'); |
| |
| return Str; |
| } |
| |
| /// GetAddrOfConstantStringFromLiteral - Return a pointer to a |
| /// constant array for the given string literal. |
| llvm::Constant * |
| CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S) { |
| // FIXME: This can be more efficient. |
| // FIXME: We shouldn't need to bitcast the constant in the wide string case. |
| llvm::Constant *C = GetAddrOfConstantString(GetStringForStringLiteral(S)); |
| if (S->isWide()) { |
| llvm::Type *DestTy = |
| llvm::PointerType::getUnqual(getTypes().ConvertType(S->getType())); |
| C = llvm::ConstantExpr::getBitCast(C, DestTy); |
| } |
| return C; |
| } |
| |
| /// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant |
| /// array for the given ObjCEncodeExpr node. |
| llvm::Constant * |
| CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) { |
| std::string Str; |
| getContext().getObjCEncodingForType(E->getEncodedType(), Str); |
| |
| return GetAddrOfConstantCString(Str); |
| } |
| |
| |
| /// GenerateWritableString -- Creates storage for a string literal. |
| static llvm::Constant *GenerateStringLiteral(const std::string &str, |
| bool constant, |
| CodeGenModule &CGM, |
| const char *GlobalName) { |
| // Create Constant for this string literal. Don't add a '\0'. |
| llvm::Constant *C = |
| llvm::ConstantArray::get(CGM.getLLVMContext(), str, false); |
| |
| // Create a global variable for this string |
| return new llvm::GlobalVariable(CGM.getModule(), C->getType(), constant, |
| llvm::GlobalValue::PrivateLinkage, |
| C, GlobalName); |
| } |
| |
| /// GetAddrOfConstantString - Returns a pointer to a character array |
| /// containing the literal. This contents are exactly that of the |
| /// given string, i.e. it will not be null terminated automatically; |
| /// see GetAddrOfConstantCString. Note that whether the result is |
| /// actually a pointer to an LLVM constant depends on |
| /// Feature.WriteableStrings. |
| /// |
| /// The result has pointer to array type. |
| llvm::Constant *CodeGenModule::GetAddrOfConstantString(const std::string &str, |
| const char *GlobalName) { |
| bool IsConstant = !Features.WritableStrings; |
| |
| // Get the default prefix if a name wasn't specified. |
| if (!GlobalName) |
| GlobalName = ".str"; |
| |
| // Don't share any string literals if strings aren't constant. |
| if (!IsConstant) |
| return GenerateStringLiteral(str, false, *this, GlobalName); |
| |
| llvm::StringMapEntry<llvm::Constant *> &Entry = |
| ConstantStringMap.GetOrCreateValue(&str[0], &str[str.length()]); |
| |
| if (Entry.getValue()) |
| return Entry.getValue(); |
| |
| // Create a global variable for this. |
| llvm::Constant *C = GenerateStringLiteral(str, true, *this, GlobalName); |
| Entry.setValue(C); |
| return C; |
| } |
| |
| /// GetAddrOfConstantCString - Returns a pointer to a character |
| /// array containing the literal and a terminating '\-' |
| /// character. The result has pointer to array type. |
| llvm::Constant *CodeGenModule::GetAddrOfConstantCString(const std::string &str, |
| const char *GlobalName){ |
| return GetAddrOfConstantString(str + '\0', GlobalName); |
| } |
| |
| /// EmitObjCPropertyImplementations - Emit information for synthesized |
| /// properties for an implementation. |
| void CodeGenModule::EmitObjCPropertyImplementations(const |
| ObjCImplementationDecl *D) { |
| for (ObjCImplementationDecl::propimpl_iterator |
| i = D->propimpl_begin(), e = D->propimpl_end(); i != e; ++i) { |
| ObjCPropertyImplDecl *PID = *i; |
| |
| // Dynamic is just for type-checking. |
| if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) { |
| ObjCPropertyDecl *PD = PID->getPropertyDecl(); |
| |
| // Determine which methods need to be implemented, some may have |
| // been overridden. Note that ::isSynthesized is not the method |
| // we want, that just indicates if the decl came from a |
| // property. What we want to know is if the method is defined in |
| // this implementation. |
| if (!D->getInstanceMethod(PD->getGetterName())) |
| CodeGenFunction(*this).GenerateObjCGetter( |
| const_cast<ObjCImplementationDecl *>(D), PID); |
| if (!PD->isReadOnly() && |
| !D->getInstanceMethod(PD->getSetterName())) |
| CodeGenFunction(*this).GenerateObjCSetter( |
| const_cast<ObjCImplementationDecl *>(D), PID); |
| } |
| } |
| } |
| |
| /// EmitObjCIvarInitializations - Emit information for ivar initialization |
| /// for an implementation. |
| void CodeGenModule::EmitObjCIvarInitializations(ObjCImplementationDecl *D) { |
| if (!Features.NeXTRuntime || D->getNumIvarInitializers() == 0) |
| return; |
| DeclContext* DC = const_cast<DeclContext*>(dyn_cast<DeclContext>(D)); |
| assert(DC && "EmitObjCIvarInitializations - null DeclContext"); |
| IdentifierInfo *II = &getContext().Idents.get(".cxx_destruct"); |
| Selector cxxSelector = getContext().Selectors.getSelector(0, &II); |
| ObjCMethodDecl *DTORMethod = ObjCMethodDecl::Create(getContext(), |
| D->getLocation(), |
| D->getLocation(), cxxSelector, |
| getContext().VoidTy, 0, |
| DC, true, false, true, |
| ObjCMethodDecl::Required); |
| D->addInstanceMethod(DTORMethod); |
| CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, DTORMethod, false); |
| |
| II = &getContext().Idents.get(".cxx_construct"); |
| cxxSelector = getContext().Selectors.getSelector(0, &II); |
| // The constructor returns 'self'. |
| ObjCMethodDecl *CTORMethod = ObjCMethodDecl::Create(getContext(), |
| D->getLocation(), |
| D->getLocation(), cxxSelector, |
| getContext().getObjCIdType(), 0, |
| DC, true, false, true, |
| ObjCMethodDecl::Required); |
| D->addInstanceMethod(CTORMethod); |
| CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, CTORMethod, true); |
| |
| |
| } |
| |
| /// EmitNamespace - Emit all declarations in a namespace. |
| void CodeGenModule::EmitNamespace(const NamespaceDecl *ND) { |
| for (RecordDecl::decl_iterator I = ND->decls_begin(), E = ND->decls_end(); |
| I != E; ++I) |
| EmitTopLevelDecl(*I); |
| } |
| |
| // EmitLinkageSpec - Emit all declarations in a linkage spec. |
| void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) { |
| if (LSD->getLanguage() != LinkageSpecDecl::lang_c && |
| LSD->getLanguage() != LinkageSpecDecl::lang_cxx) { |
| ErrorUnsupported(LSD, "linkage spec"); |
| return; |
| } |
| |
| for (RecordDecl::decl_iterator I = LSD->decls_begin(), E = LSD->decls_end(); |
| I != E; ++I) |
| EmitTopLevelDecl(*I); |
| } |
| |
| /// EmitTopLevelDecl - Emit code for a single top level declaration. |
| void CodeGenModule::EmitTopLevelDecl(Decl *D) { |
| // If an error has occurred, stop code generation, but continue |
| // parsing and semantic analysis (to ensure all warnings and errors |
| // are emitted). |
| if (Diags.hasErrorOccurred()) |
| return; |
| |
| // Ignore dependent declarations. |
| if (D->getDeclContext() && D->getDeclContext()->isDependentContext()) |
| return; |
| |
| switch (D->getKind()) { |
| case Decl::CXXConversion: |
| case Decl::CXXMethod: |
| case Decl::Function: |
| // Skip function templates |
| if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate()) |
| return; |
| |
| EmitGlobal(cast<FunctionDecl>(D)); |
| break; |
| |
| case Decl::Var: |
| EmitGlobal(cast<VarDecl>(D)); |
| break; |
| |
| // C++ Decls |
| case Decl::Namespace: |
| EmitNamespace(cast<NamespaceDecl>(D)); |
| break; |
| // No code generation needed. |
| case Decl::UsingShadow: |
| case Decl::Using: |
| case Decl::UsingDirective: |
| case Decl::ClassTemplate: |
| case Decl::FunctionTemplate: |
| case Decl::NamespaceAlias: |
| break; |
| case Decl::CXXConstructor: |
| // Skip function templates |
| if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate()) |
| return; |
| |
| EmitCXXConstructors(cast<CXXConstructorDecl>(D)); |
| break; |
| case Decl::CXXDestructor: |
| EmitCXXDestructors(cast<CXXDestructorDecl>(D)); |
| break; |
| |
| case Decl::StaticAssert: |
| // Nothing to do. |
| break; |
| |
| // Objective-C Decls |
| |
| // Forward declarations, no (immediate) code generation. |
| case Decl::ObjCClass: |
| case Decl::ObjCForwardProtocol: |
| case Decl::ObjCCategory: |
| case Decl::ObjCInterface: |
| break; |
| |
| case Decl::ObjCProtocol: |
| Runtime->GenerateProtocol(cast<ObjCProtocolDecl>(D)); |
| break; |
| |
| case Decl::ObjCCategoryImpl: |
| // Categories have properties but don't support synthesize so we |
| // can ignore them here. |
| Runtime->GenerateCategory(cast<ObjCCategoryImplDecl>(D)); |
| break; |
| |
| case Decl::ObjCImplementation: { |
| ObjCImplementationDecl *OMD = cast<ObjCImplementationDecl>(D); |
| EmitObjCPropertyImplementations(OMD); |
| EmitObjCIvarInitializations(OMD); |
| Runtime->GenerateClass(OMD); |
| break; |
| } |
| case Decl::ObjCMethod: { |
| ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(D); |
| // If this is not a prototype, emit the body. |
| if (OMD->getBody()) |
| CodeGenFunction(*this).GenerateObjCMethod(OMD); |
| break; |
| } |
| case Decl::ObjCCompatibleAlias: |
| // compatibility-alias is a directive and has no code gen. |
| break; |
| |
| case Decl::LinkageSpec: |
| EmitLinkageSpec(cast<LinkageSpecDecl>(D)); |
| break; |
| |
| case Decl::FileScopeAsm: { |
| FileScopeAsmDecl *AD = cast<FileScopeAsmDecl>(D); |
| llvm::StringRef AsmString = AD->getAsmString()->getString(); |
| |
| const std::string &S = getModule().getModuleInlineAsm(); |
| if (S.empty()) |
| getModule().setModuleInlineAsm(AsmString); |
| else |
| getModule().setModuleInlineAsm(S + '\n' + AsmString.str()); |
| break; |
| } |
| |
| default: |
| // Make sure we handled everything we should, every other kind is a |
| // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind |
| // function. Need to recode Decl::Kind to do that easily. |
| assert(isa<TypeDecl>(D) && "Unsupported decl kind"); |
| } |
| } |