| //===--- CodeGenTypes.cpp - Type translation for LLVM CodeGen -------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This is the code that handles AST -> LLVM type lowering. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "CodeGenTypes.h" |
| #include "CGCall.h" |
| #include "CGCXXABI.h" |
| #include "CGRecordLayout.h" |
| #include "clang/AST/ASTContext.h" |
| #include "clang/AST/DeclObjC.h" |
| #include "clang/AST/DeclCXX.h" |
| #include "clang/AST/Expr.h" |
| #include "clang/AST/RecordLayout.h" |
| #include "llvm/DerivedTypes.h" |
| #include "llvm/Module.h" |
| #include "llvm/Target/TargetData.h" |
| using namespace clang; |
| using namespace CodeGen; |
| |
| CodeGenTypes::CodeGenTypes(ASTContext &Ctx, llvm::Module& M, |
| const llvm::TargetData &TD, const ABIInfo &Info, |
| CGCXXABI &CXXABI, const CodeGenOptions &CGO) |
| : Context(Ctx), Target(Ctx.Target), TheModule(M), TheTargetData(TD), |
| TheABIInfo(Info), TheCXXABI(CXXABI), CodeGenOpts(CGO) { |
| } |
| |
| CodeGenTypes::~CodeGenTypes() { |
| for (llvm::DenseMap<const Type *, CGRecordLayout *>::iterator |
| I = CGRecordLayouts.begin(), E = CGRecordLayouts.end(); |
| I != E; ++I) |
| delete I->second; |
| |
| for (llvm::FoldingSet<CGFunctionInfo>::iterator |
| I = FunctionInfos.begin(), E = FunctionInfos.end(); I != E; ) |
| delete &*I++; |
| } |
| |
| void CodeGenTypes::addRecordTypeName(const RecordDecl *RD, |
| llvm::StructType *Ty, |
| llvm::StringRef suffix) { |
| llvm::SmallString<256> TypeName; |
| llvm::raw_svector_ostream OS(TypeName); |
| OS << RD->getKindName() << '.'; |
| |
| // Name the codegen type after the typedef name |
| // if there is no tag type name available |
| if (RD->getIdentifier()) { |
| // FIXME: We should not have to check for a null decl context here. |
| // Right now we do it because the implicit Obj-C decls don't have one. |
| if (RD->getDeclContext()) |
| OS << RD->getQualifiedNameAsString(); |
| else |
| RD->printName(OS); |
| } else if (const TypedefNameDecl *TDD = RD->getTypedefNameForAnonDecl()) { |
| // FIXME: We should not have to check for a null decl context here. |
| // Right now we do it because the implicit Obj-C decls don't have one. |
| if (TDD->getDeclContext()) |
| OS << TDD->getQualifiedNameAsString(); |
| else |
| TDD->printName(OS); |
| } else |
| OS << "anon"; |
| |
| if (!suffix.empty()) |
| OS << suffix; |
| |
| Ty->setName(OS.str()); |
| } |
| |
| /// ConvertTypeForMem - Convert type T into a llvm::Type. This differs from |
| /// ConvertType in that it is used to convert to the memory representation for |
| /// a type. For example, the scalar representation for _Bool is i1, but the |
| /// memory representation is usually i8 or i32, depending on the target. |
| llvm::Type *CodeGenTypes::ConvertTypeForMem(QualType T){ |
| llvm::Type *R = ConvertType(T); |
| |
| // If this is a non-bool type, don't map it. |
| if (!R->isIntegerTy(1)) |
| return R; |
| |
| // Otherwise, return an integer of the target-specified size. |
| return llvm::IntegerType::get(getLLVMContext(), |
| (unsigned)Context.getTypeSize(T)); |
| |
| } |
| |
| // Code to verify a given function type is complete, i.e. the return type |
| // and all of the argument types are complete. |
| const TagType *CodeGenTypes::VerifyFuncTypeComplete(const Type* T) { |
| const FunctionType *FT = cast<FunctionType>(T); |
| if (const TagType* TT = FT->getResultType()->getAs<TagType>()) |
| if (!TT->getDecl()->isDefinition()) |
| return TT; |
| if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(T)) |
| for (unsigned i = 0, e = FPT->getNumArgs(); i != e; i++) |
| if (const TagType *TT = FPT->getArgType(i)->getAs<TagType>()) |
| if (!TT->getDecl()->isDefinition()) |
| return TT; |
| return 0; |
| } |
| |
| /// UpdateCompletedType - When we find the full definition for a TagDecl, |
| /// replace the 'opaque' type we previously made for it if applicable. |
| void CodeGenTypes::UpdateCompletedType(const TagDecl *TD) { |
| // If this is an enum being completed, then we flush all non-struct types from |
| // the cache. This allows function types and other things that may be derived |
| // from the enum to be recomputed. |
| if (isa<EnumDecl>(TD)) { |
| TypeCache.clear(); |
| return; |
| } |
| |
| const RecordDecl *RD = cast<RecordDecl>(TD); |
| if (!RD->isDependentType()) |
| ConvertRecordDeclType(RD); |
| } |
| |
| static llvm::Type *getTypeForFormat(llvm::LLVMContext &VMContext, |
| const llvm::fltSemantics &format) { |
| if (&format == &llvm::APFloat::IEEEsingle) |
| return llvm::Type::getFloatTy(VMContext); |
| if (&format == &llvm::APFloat::IEEEdouble) |
| return llvm::Type::getDoubleTy(VMContext); |
| if (&format == &llvm::APFloat::IEEEquad) |
| return llvm::Type::getFP128Ty(VMContext); |
| if (&format == &llvm::APFloat::PPCDoubleDouble) |
| return llvm::Type::getPPC_FP128Ty(VMContext); |
| if (&format == &llvm::APFloat::x87DoubleExtended) |
| return llvm::Type::getX86_FP80Ty(VMContext); |
| assert(0 && "Unknown float format!"); |
| return 0; |
| } |
| |
| /// ConvertType - Convert the specified type to its LLVM form. |
| llvm::Type *CodeGenTypes::ConvertType(QualType T) { |
| T = Context.getCanonicalType(T); |
| |
| const Type *Ty = T.getTypePtr(); |
| |
| // RecordTypes are cached and processed specially. |
| if (const RecordType *RT = dyn_cast<RecordType>(Ty)) |
| return ConvertRecordDeclType(RT->getDecl()); |
| |
| // See if type is already cached. |
| llvm::DenseMap<const Type *, llvm::Type *>::iterator TCI = TypeCache.find(Ty); |
| // If type is found in map then use it. Otherwise, convert type T. |
| if (TCI != TypeCache.end()) |
| return TCI->second; |
| |
| // If we don't have it in the cache, convert it now. |
| llvm::Type *ResultType = 0; |
| switch (Ty->getTypeClass()) { |
| case Type::Record: // Handled above. |
| #define TYPE(Class, Base) |
| #define ABSTRACT_TYPE(Class, Base) |
| #define NON_CANONICAL_TYPE(Class, Base) case Type::Class: |
| #define DEPENDENT_TYPE(Class, Base) case Type::Class: |
| #define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base) case Type::Class: |
| #include "clang/AST/TypeNodes.def" |
| llvm_unreachable("Non-canonical or dependent types aren't possible."); |
| break; |
| |
| case Type::Builtin: { |
| switch (cast<BuiltinType>(Ty)->getKind()) { |
| case BuiltinType::Void: |
| case BuiltinType::ObjCId: |
| case BuiltinType::ObjCClass: |
| case BuiltinType::ObjCSel: |
| // LLVM void type can only be used as the result of a function call. Just |
| // map to the same as char. |
| ResultType = llvm::Type::getInt8Ty(getLLVMContext()); |
| break; |
| |
| case BuiltinType::Bool: |
| // Note that we always return bool as i1 for use as a scalar type. |
| ResultType = llvm::Type::getInt1Ty(getLLVMContext()); |
| break; |
| |
| case BuiltinType::Char_S: |
| case BuiltinType::Char_U: |
| case BuiltinType::SChar: |
| case BuiltinType::UChar: |
| case BuiltinType::Short: |
| case BuiltinType::UShort: |
| case BuiltinType::Int: |
| case BuiltinType::UInt: |
| case BuiltinType::Long: |
| case BuiltinType::ULong: |
| case BuiltinType::LongLong: |
| case BuiltinType::ULongLong: |
| case BuiltinType::WChar_S: |
| case BuiltinType::WChar_U: |
| case BuiltinType::Char16: |
| case BuiltinType::Char32: |
| ResultType = llvm::IntegerType::get(getLLVMContext(), |
| static_cast<unsigned>(Context.getTypeSize(T))); |
| break; |
| |
| case BuiltinType::Float: |
| case BuiltinType::Double: |
| case BuiltinType::LongDouble: |
| ResultType = getTypeForFormat(getLLVMContext(), |
| Context.getFloatTypeSemantics(T)); |
| break; |
| |
| case BuiltinType::NullPtr: |
| // Model std::nullptr_t as i8* |
| ResultType = llvm::Type::getInt8PtrTy(getLLVMContext()); |
| break; |
| |
| case BuiltinType::UInt128: |
| case BuiltinType::Int128: |
| ResultType = llvm::IntegerType::get(getLLVMContext(), 128); |
| break; |
| |
| case BuiltinType::Overload: |
| case BuiltinType::Dependent: |
| case BuiltinType::BoundMember: |
| case BuiltinType::UnknownAny: |
| llvm_unreachable("Unexpected placeholder builtin type!"); |
| break; |
| } |
| break; |
| } |
| case Type::Complex: { |
| const llvm::Type *EltTy = |
| ConvertType(cast<ComplexType>(Ty)->getElementType()); |
| ResultType = llvm::StructType::get(EltTy, EltTy, NULL); |
| break; |
| } |
| case Type::LValueReference: |
| case Type::RValueReference: { |
| RecursionStatePointerRAII X(RecursionState); |
| const ReferenceType *RTy = cast<ReferenceType>(Ty); |
| QualType ETy = RTy->getPointeeType(); |
| llvm::Type *PointeeType = ConvertTypeForMem(ETy); |
| unsigned AS = Context.getTargetAddressSpace(ETy); |
| ResultType = llvm::PointerType::get(PointeeType, AS); |
| break; |
| } |
| case Type::Pointer: { |
| RecursionStatePointerRAII X(RecursionState); |
| const PointerType *PTy = cast<PointerType>(Ty); |
| QualType ETy = PTy->getPointeeType(); |
| llvm::Type *PointeeType = ConvertTypeForMem(ETy); |
| if (PointeeType->isVoidTy()) |
| PointeeType = llvm::Type::getInt8Ty(getLLVMContext()); |
| unsigned AS = Context.getTargetAddressSpace(ETy); |
| ResultType = llvm::PointerType::get(PointeeType, AS); |
| break; |
| } |
| |
| case Type::VariableArray: { |
| const VariableArrayType *A = cast<VariableArrayType>(Ty); |
| assert(A->getIndexTypeCVRQualifiers() == 0 && |
| "FIXME: We only handle trivial array types so far!"); |
| // VLAs resolve to the innermost element type; this matches |
| // the return of alloca, and there isn't any obviously better choice. |
| ResultType = ConvertTypeForMem(A->getElementType()); |
| break; |
| } |
| case Type::IncompleteArray: { |
| const IncompleteArrayType *A = cast<IncompleteArrayType>(Ty); |
| assert(A->getIndexTypeCVRQualifiers() == 0 && |
| "FIXME: We only handle trivial array types so far!"); |
| // int X[] -> [0 x int] |
| ResultType = llvm::ArrayType::get(ConvertTypeForMem(A->getElementType()),0); |
| break; |
| } |
| case Type::ConstantArray: { |
| const ConstantArrayType *A = cast<ConstantArrayType>(Ty); |
| const llvm::Type *EltTy = ConvertTypeForMem(A->getElementType()); |
| ResultType = llvm::ArrayType::get(EltTy, A->getSize().getZExtValue()); |
| break; |
| } |
| case Type::ExtVector: |
| case Type::Vector: { |
| const VectorType *VT = cast<VectorType>(Ty); |
| ResultType = llvm::VectorType::get(ConvertType(VT->getElementType()), |
| VT->getNumElements()); |
| break; |
| } |
| case Type::FunctionNoProto: |
| case Type::FunctionProto: { |
| // First, check whether we can build the full function type. If the |
| // function type depends on an incomplete type (e.g. a struct or enum), we |
| // cannot lower the function type. |
| if (VerifyFuncTypeComplete(Ty)) { |
| // This function's type depends on an incomplete tag type. |
| // Return a placeholder type. |
| ResultType = llvm::StructType::get(getLLVMContext()); |
| break; |
| } |
| |
| // The function type can be built; call the appropriate routines to |
| // build it. |
| const CGFunctionInfo *FI; |
| bool isVariadic; |
| if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(Ty)) { |
| FI = &getFunctionInfo( |
| CanQual<FunctionProtoType>::CreateUnsafe(QualType(FPT, 0))); |
| isVariadic = FPT->isVariadic(); |
| } else { |
| const FunctionNoProtoType *FNPT = cast<FunctionNoProtoType>(Ty); |
| FI = &getFunctionInfo( |
| CanQual<FunctionNoProtoType>::CreateUnsafe(QualType(FNPT, 0))); |
| isVariadic = true; |
| } |
| |
| ResultType = GetFunctionType(*FI, isVariadic); |
| break; |
| } |
| |
| case Type::ObjCObject: |
| ResultType = ConvertType(cast<ObjCObjectType>(Ty)->getBaseType()); |
| break; |
| |
| case Type::ObjCInterface: { |
| // Objective-C interfaces are always opaque (outside of the |
| // runtime, which can do whatever it likes); we never refine |
| // these. |
| llvm::Type *&T = InterfaceTypes[cast<ObjCInterfaceType>(Ty)]; |
| if (!T) |
| T = llvm::StructType::createNamed(getLLVMContext(), ""); |
| ResultType = T; |
| break; |
| } |
| |
| case Type::ObjCObjectPointer: { |
| RecursionStatePointerRAII X(RecursionState); |
| // Protocol qualifications do not influence the LLVM type, we just return a |
| // pointer to the underlying interface type. We don't need to worry about |
| // recursive conversion. |
| const llvm::Type *T = |
| ConvertType(cast<ObjCObjectPointerType>(Ty)->getPointeeType()); |
| ResultType = T->getPointerTo(); |
| break; |
| } |
| |
| case Type::Enum: { |
| const EnumDecl *ED = cast<EnumType>(Ty)->getDecl(); |
| if (ED->isDefinition() || ED->isFixed()) |
| return ConvertType(ED->getIntegerType()); |
| // Return a placeholder '{}' type. |
| ResultType = llvm::StructType::get(getLLVMContext()); |
| break; |
| } |
| |
| case Type::BlockPointer: { |
| RecursionStatePointerRAII X(RecursionState); |
| const QualType FTy = cast<BlockPointerType>(Ty)->getPointeeType(); |
| llvm::Type *PointeeType = ConvertTypeForMem(FTy); |
| unsigned AS = Context.getTargetAddressSpace(FTy); |
| ResultType = llvm::PointerType::get(PointeeType, AS); |
| break; |
| } |
| |
| case Type::MemberPointer: { |
| ResultType = |
| getCXXABI().ConvertMemberPointerType(cast<MemberPointerType>(Ty)); |
| break; |
| } |
| } |
| |
| assert(ResultType && "Didn't convert a type?"); |
| |
| TypeCache[Ty] = ResultType; |
| return ResultType; |
| } |
| |
| /// ConvertRecordDeclType - Lay out a tagged decl type like struct or union. |
| llvm::StructType *CodeGenTypes::ConvertRecordDeclType(const RecordDecl *RD) { |
| // TagDecl's are not necessarily unique, instead use the (clang) |
| // type connected to the decl. |
| const Type *Key = Context.getTagDeclType(RD).getTypePtr(); |
| |
| llvm::StructType *&Entry = RecordDeclTypes[Key]; |
| |
| // If we don't have a StructType at all yet, create the forward declaration. |
| if (Entry == 0) |
| Entry = llvm::StructType::createNamed(getLLVMContext(), |
| std::string(RD->getKindName()) + "." + |
| RD->getQualifiedNameAsString()); |
| llvm::StructType *Ty = Entry; |
| |
| // If this is still a forward declaration, or the LLVM type is already |
| // complete, there's nothing more to do. |
| if (!RD->isDefinition() || !Ty->isOpaque()) |
| return Ty; |
| |
| // If we're recursively nested inside the conversion of a pointer inside the |
| // struct, defer conversion. |
| if (RecursionState == RS_StructPointer) { |
| DeferredRecords.push_back(RD); |
| return Ty; |
| } |
| |
| // Okay, this is a definition of a type. Compile the implementation now. |
| RecursionStateTy SavedRecursionState = RecursionState; |
| RecursionState = RS_Struct; |
| |
| // Force conversion of non-virtual base classes recursively. |
| if (const CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { |
| for (CXXRecordDecl::base_class_const_iterator i = CRD->bases_begin(), |
| e = CRD->bases_end(); i != e; ++i) { |
| if (!i->isVirtual()) { |
| const CXXRecordDecl *Base = |
| cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); |
| ConvertRecordDeclType(Base); |
| } |
| } |
| } |
| |
| // Layout fields. |
| CGRecordLayout *Layout = ComputeRecordLayout(RD, Ty); |
| CGRecordLayouts[Key] = Layout; |
| |
| |
| // Restore our recursion state. If we're done converting the outer-most |
| // record, then convert any deferred structs as well. |
| RecursionState = SavedRecursionState; |
| if (RecursionState == RS_Normal) |
| while (!DeferredRecords.empty()) |
| ConvertRecordDeclType(DeferredRecords.pop_back_val()); |
| |
| return Ty; |
| } |
| |
| /// getCGRecordLayout - Return record layout info for the given record decl. |
| const CGRecordLayout & |
| CodeGenTypes::getCGRecordLayout(const RecordDecl *RD) { |
| const Type *Key = Context.getTagDeclType(RD).getTypePtr(); |
| |
| const CGRecordLayout *Layout = CGRecordLayouts.lookup(Key); |
| if (!Layout) { |
| // Compute the type information. |
| ConvertRecordDeclType(RD); |
| |
| // Now try again. |
| Layout = CGRecordLayouts.lookup(Key); |
| } |
| |
| assert(Layout && "Unable to find record layout information for type"); |
| return *Layout; |
| } |
| |
| bool CodeGenTypes::isZeroInitializable(QualType T) { |
| // No need to check for member pointers when not compiling C++. |
| if (!Context.getLangOptions().CPlusPlus) |
| return true; |
| |
| T = Context.getBaseElementType(T); |
| |
| // Records are non-zero-initializable if they contain any |
| // non-zero-initializable subobjects. |
| if (const RecordType *RT = T->getAs<RecordType>()) { |
| const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
| return isZeroInitializable(RD); |
| } |
| |
| // We have to ask the ABI about member pointers. |
| if (const MemberPointerType *MPT = T->getAs<MemberPointerType>()) |
| return getCXXABI().isZeroInitializable(MPT); |
| |
| // Everything else is okay. |
| return true; |
| } |
| |
| bool CodeGenTypes::isZeroInitializable(const CXXRecordDecl *RD) { |
| return getCGRecordLayout(RD).isZeroInitializable(); |
| } |