| //===--- 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) |
| : Context(Ctx), Target(Ctx.Target), TheModule(M), TheTargetData(TD), |
| TheABIInfo(Info), TheCXXABI(CXXABI) { |
| } |
| |
| 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++; |
| } |
| |
| /// HandleLateResolvedPointers - For top-level ConvertType calls, this handles |
| /// pointers that are referenced but have not been converted yet. This is used |
| /// to handle cyclic structures properly. |
| void CodeGenTypes::HandleLateResolvedPointers() { |
| assert(!PointersToResolve.empty() && "No pointers to resolve!"); |
| |
| // Any pointers that were converted deferred evaluation of their pointee type, |
| // creating an opaque type instead. This is in order to avoid problems with |
| // circular types. Loop through all these defered pointees, if any, and |
| // resolve them now. |
| while (!PointersToResolve.empty()) { |
| std::pair<QualType, llvm::OpaqueType*> P = PointersToResolve.pop_back_val(); |
| |
| // We can handle bare pointers here because we know that the only pointers |
| // to the Opaque type are P.second and from other types. Refining the |
| // opqaue type away will invalidate P.second, but we don't mind :). |
| const llvm::Type *NT = ConvertTypeForMemRecursive(P.first); |
| P.second->refineAbstractTypeTo(NT); |
| } |
| } |
| |
| |
| /// ConvertType - Convert the specified type to its LLVM form. |
| const llvm::Type *CodeGenTypes::ConvertType(QualType T, bool IsRecursive) { |
| const llvm::Type *Result = ConvertTypeRecursive(T); |
| |
| // If this is a top-level call to ConvertType and sub-conversions caused |
| // pointers to get lazily built as opaque types, resolve the pointers, which |
| // might cause Result to be merged away. |
| if (!IsRecursive && !PointersToResolve.empty()) { |
| llvm::PATypeHolder ResultHandle = Result; |
| HandleLateResolvedPointers(); |
| Result = ResultHandle; |
| } |
| return Result; |
| } |
| |
| const llvm::Type *CodeGenTypes::ConvertTypeRecursive(QualType T) { |
| T = Context.getCanonicalType(T); |
| |
| // See if type is already cached. |
| llvm::DenseMap<Type *, llvm::PATypeHolder>::iterator |
| I = TypeCache.find(T.getTypePtr()); |
| // If type is found in map and this is not a definition for a opaque |
| // place holder type then use it. Otherwise, convert type T. |
| if (I != TypeCache.end()) |
| return I->second.get(); |
| |
| const llvm::Type *ResultType = ConvertNewType(T); |
| TypeCache.insert(std::make_pair(T.getTypePtr(), |
| llvm::PATypeHolder(ResultType))); |
| return ResultType; |
| } |
| |
| /// 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. |
| const llvm::Type *CodeGenTypes::ConvertTypeForMem(QualType T, bool IsRecursive){ |
| const llvm::Type *R = ConvertType(T, IsRecursive); |
| |
| // 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; i < FPT->getNumArgs(); 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) { |
| const Type *Key = Context.getTagDeclType(TD).getTypePtr(); |
| llvm::DenseMap<const Type*, llvm::PATypeHolder>::iterator TDTI = |
| TagDeclTypes.find(Key); |
| if (TDTI == TagDeclTypes.end()) return; |
| |
| // Remember the opaque LLVM type for this tagdecl. |
| llvm::PATypeHolder OpaqueHolder = TDTI->second; |
| assert(isa<llvm::OpaqueType>(OpaqueHolder.get()) && |
| "Updating compilation of an already non-opaque type?"); |
| |
| // Remove it from TagDeclTypes so that it will be regenerated. |
| TagDeclTypes.erase(TDTI); |
| |
| // Generate the new type. |
| const llvm::Type *NT = ConvertTagDeclType(TD); |
| |
| // Refine the old opaque type to its new definition. |
| cast<llvm::OpaqueType>(OpaqueHolder.get())->refineAbstractTypeTo(NT); |
| |
| // Since we just completed a tag type, check to see if any function types |
| // were completed along with the tag type. |
| // FIXME: This is very inefficient; if we track which function types depend |
| // on which tag types, though, it should be reasonably efficient. |
| llvm::DenseMap<const Type*, llvm::PATypeHolder>::iterator i; |
| for (i = FunctionTypes.begin(); i != FunctionTypes.end(); ++i) { |
| if (const TagType* TT = VerifyFuncTypeComplete(i->first)) { |
| // This function type still depends on an incomplete tag type; make sure |
| // that tag type has an associated opaque type. |
| ConvertTagDeclType(TT->getDecl()); |
| } else { |
| // This function no longer depends on an incomplete tag type; create the |
| // function type, and refine the opaque type to the new function type. |
| llvm::PATypeHolder OpaqueHolder = i->second; |
| const llvm::Type *NFT = ConvertNewType(QualType(i->first, 0)); |
| cast<llvm::OpaqueType>(OpaqueHolder.get())->refineAbstractTypeTo(NFT); |
| FunctionTypes.erase(i); |
| } |
| } |
| } |
| |
| static const 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; |
| } |
| |
| const llvm::Type *CodeGenTypes::ConvertNewType(QualType T) { |
| const clang::Type &Ty = *Context.getCanonicalType(T).getTypePtr(); |
| |
| switch (Ty.getTypeClass()) { |
| #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" |
| assert(false && "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. |
| return llvm::Type::getInt8Ty(getLLVMContext()); |
| |
| case BuiltinType::Bool: |
| // Note that we always return bool as i1 for use as a scalar type. |
| return llvm::Type::getInt1Ty(getLLVMContext()); |
| |
| 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: |
| return llvm::IntegerType::get(getLLVMContext(), |
| static_cast<unsigned>(Context.getTypeSize(T))); |
| |
| case BuiltinType::Float: |
| case BuiltinType::Double: |
| case BuiltinType::LongDouble: |
| return getTypeForFormat(getLLVMContext(), |
| Context.getFloatTypeSemantics(T)); |
| |
| case BuiltinType::NullPtr: { |
| // Model std::nullptr_t as i8* |
| const llvm::Type *Ty = llvm::Type::getInt8Ty(getLLVMContext()); |
| return llvm::PointerType::getUnqual(Ty); |
| } |
| |
| case BuiltinType::UInt128: |
| case BuiltinType::Int128: |
| return llvm::IntegerType::get(getLLVMContext(), 128); |
| |
| case BuiltinType::Overload: |
| case BuiltinType::Dependent: |
| case BuiltinType::UndeducedAuto: |
| assert(0 && "Unexpected builtin type!"); |
| break; |
| } |
| assert(0 && "Unknown builtin type!"); |
| break; |
| } |
| case Type::Complex: { |
| const llvm::Type *EltTy = |
| ConvertTypeRecursive(cast<ComplexType>(Ty).getElementType()); |
| return llvm::StructType::get(TheModule.getContext(), EltTy, EltTy, NULL); |
| } |
| case Type::LValueReference: |
| case Type::RValueReference: { |
| const ReferenceType &RTy = cast<ReferenceType>(Ty); |
| QualType ETy = RTy.getPointeeType(); |
| llvm::OpaqueType *PointeeType = llvm::OpaqueType::get(getLLVMContext()); |
| PointersToResolve.push_back(std::make_pair(ETy, PointeeType)); |
| return llvm::PointerType::get(PointeeType, ETy.getAddressSpace()); |
| } |
| case Type::Pointer: { |
| const PointerType &PTy = cast<PointerType>(Ty); |
| QualType ETy = PTy.getPointeeType(); |
| llvm::OpaqueType *PointeeType = llvm::OpaqueType::get(getLLVMContext()); |
| PointersToResolve.push_back(std::make_pair(ETy, PointeeType)); |
| return llvm::PointerType::get(PointeeType, ETy.getAddressSpace()); |
| } |
| |
| 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. |
| return ConvertTypeForMemRecursive(A.getElementType()); |
| } |
| 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] |
| return llvm::ArrayType::get(ConvertTypeForMemRecursive(A.getElementType()), |
| 0); |
| } |
| case Type::ConstantArray: { |
| const ConstantArrayType &A = cast<ConstantArrayType>(Ty); |
| const llvm::Type *EltTy = ConvertTypeForMemRecursive(A.getElementType()); |
| return llvm::ArrayType::get(EltTy, A.getSize().getZExtValue()); |
| } |
| case Type::ExtVector: |
| case Type::Vector: { |
| const VectorType &VT = cast<VectorType>(Ty); |
| return llvm::VectorType::get(ConvertTypeRecursive(VT.getElementType()), |
| VT.getNumElements()); |
| } |
| 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. Instead, turn it into an Opaque pointer |
| // and have UpdateCompletedType revisit the function type when/if the opaque |
| // argument type is defined. |
| if (const TagType *TT = VerifyFuncTypeComplete(&Ty)) { |
| // This function's type depends on an incomplete tag type; make sure |
| // we have an opaque type corresponding to the tag type. |
| ConvertTagDeclType(TT->getDecl()); |
| // Create an opaque type for this function type, save it, and return it. |
| llvm::Type *ResultType = llvm::OpaqueType::get(getLLVMContext()); |
| FunctionTypes.insert(std::make_pair(&Ty, ResultType)); |
| return ResultType; |
| } |
| |
| // 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)), |
| true /*Recursive*/); |
| isVariadic = FPT->isVariadic(); |
| } else { |
| const FunctionNoProtoType *FNPT = cast<FunctionNoProtoType>(&Ty); |
| FI = &getFunctionInfo( |
| CanQual<FunctionNoProtoType>::CreateUnsafe(QualType(FNPT, 0)), |
| true /*Recursive*/); |
| isVariadic = true; |
| } |
| |
| return GetFunctionType(*FI, isVariadic, true); |
| } |
| |
| case Type::ObjCObject: |
| return ConvertTypeRecursive(cast<ObjCObjectType>(Ty).getBaseType()); |
| |
| case Type::ObjCInterface: { |
| // Objective-C interfaces are always opaque (outside of the |
| // runtime, which can do whatever it likes); we never refine |
| // these. |
| const llvm::Type *&T = InterfaceTypes[cast<ObjCInterfaceType>(&Ty)]; |
| if (!T) |
| T = llvm::OpaqueType::get(getLLVMContext()); |
| return T; |
| } |
| |
| case Type::ObjCObjectPointer: { |
| // 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 = |
| ConvertTypeRecursive(cast<ObjCObjectPointerType>(Ty).getPointeeType()); |
| return llvm::PointerType::getUnqual(T); |
| } |
| |
| case Type::Record: |
| case Type::Enum: { |
| const TagDecl *TD = cast<TagType>(Ty).getDecl(); |
| const llvm::Type *Res = ConvertTagDeclType(TD); |
| |
| llvm::SmallString<256> TypeName; |
| llvm::raw_svector_ostream OS(TypeName); |
| OS << TD->getKindName() << '.'; |
| |
| // Name the codegen type after the typedef name |
| // if there is no tag type name available |
| if (TD->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 (TD->getDeclContext()) |
| OS << TD->getQualifiedNameAsString(); |
| else |
| TD->printName(OS); |
| } else if (const TypedefDecl *TDD = TD->getTypedefForAnonDecl()) { |
| // 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"; |
| |
| TheModule.addTypeName(OS.str(), Res); |
| return Res; |
| } |
| |
| case Type::BlockPointer: { |
| const QualType FTy = cast<BlockPointerType>(Ty).getPointeeType(); |
| llvm::OpaqueType *PointeeType = llvm::OpaqueType::get(getLLVMContext()); |
| PointersToResolve.push_back(std::make_pair(FTy, PointeeType)); |
| return llvm::PointerType::get(PointeeType, FTy.getAddressSpace()); |
| } |
| |
| case Type::MemberPointer: { |
| return getCXXABI().ConvertMemberPointerType(cast<MemberPointerType>(&Ty)); |
| } |
| } |
| |
| // FIXME: implement. |
| return llvm::OpaqueType::get(getLLVMContext()); |
| } |
| |
| /// ConvertTagDeclType - Lay out a tagged decl type like struct or union or |
| /// enum. |
| const llvm::Type *CodeGenTypes::ConvertTagDeclType(const TagDecl *TD) { |
| // TagDecl's are not necessarily unique, instead use the (clang) |
| // type connected to the decl. |
| const Type *Key = |
| Context.getTagDeclType(TD).getTypePtr(); |
| llvm::DenseMap<const Type*, llvm::PATypeHolder>::iterator TDTI = |
| TagDeclTypes.find(Key); |
| |
| // If we've already compiled this tag type, use the previous definition. |
| if (TDTI != TagDeclTypes.end()) |
| return TDTI->second; |
| |
| const EnumDecl *ED = dyn_cast<EnumDecl>(TD); |
| |
| // If this is still a forward declaration, just define an opaque |
| // type to use for this tagged decl. |
| // C++0x: If this is a enumeration type with fixed underlying type, |
| // consider it complete. |
| if (!TD->isDefinition() && !(ED && ED->isFixed())) { |
| llvm::Type *ResultType = llvm::OpaqueType::get(getLLVMContext()); |
| TagDeclTypes.insert(std::make_pair(Key, ResultType)); |
| return ResultType; |
| } |
| |
| // Okay, this is a definition of a type. Compile the implementation now. |
| |
| if (ED) // Don't bother storing enums in TagDeclTypes. |
| return ConvertTypeRecursive(ED->getIntegerType()); |
| |
| // This decl could well be recursive. In this case, insert an opaque |
| // definition of this type, which the recursive uses will get. We will then |
| // refine this opaque version later. |
| |
| // Create new OpaqueType now for later use in case this is a recursive |
| // type. This will later be refined to the actual type. |
| llvm::PATypeHolder ResultHolder = llvm::OpaqueType::get(getLLVMContext()); |
| TagDeclTypes.insert(std::make_pair(Key, ResultHolder)); |
| |
| const RecordDecl *RD = cast<const RecordDecl>(TD); |
| |
| // Force conversion of non-virtual base classes recursively. |
| if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) { |
| for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), |
| e = RD->bases_end(); i != e; ++i) { |
| if (!i->isVirtual()) { |
| const CXXRecordDecl *Base = |
| cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); |
| ConvertTagDeclType(Base); |
| } |
| } |
| } |
| |
| // Layout fields. |
| CGRecordLayout *Layout = ComputeRecordLayout(RD); |
| |
| CGRecordLayouts[Key] = Layout; |
| const llvm::Type *ResultType = Layout->getLLVMType(); |
| |
| // Refine our Opaque type to ResultType. This can invalidate ResultType, so |
| // make sure to read the result out of the holder. |
| cast<llvm::OpaqueType>(ResultHolder.get()) |
| ->refineAbstractTypeTo(ResultType); |
| |
| return ResultHolder.get(); |
| } |
| |
| /// 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. |
| ConvertTagDeclType(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(); |
| } |