| //===--- CodeGenTypes.h - Type translation for LLVM CodeGen -----*- C++ -*-===// |
| // |
| // 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. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_CLANG_LIB_CODEGEN_CODEGENTYPES_H |
| #define LLVM_CLANG_LIB_CODEGEN_CODEGENTYPES_H |
| |
| #include "CGCall.h" |
| #include "clang/Basic/ABI.h" |
| #include "clang/CodeGen/CGFunctionInfo.h" |
| #include "clang/Sema/Sema.h" |
| #include "llvm/ADT/DenseMap.h" |
| #include "llvm/IR/Module.h" |
| |
| namespace llvm { |
| class FunctionType; |
| class DataLayout; |
| class Type; |
| class LLVMContext; |
| class StructType; |
| } |
| |
| namespace clang { |
| class ASTContext; |
| template <typename> class CanQual; |
| class CXXConstructorDecl; |
| class CXXDestructorDecl; |
| class CXXMethodDecl; |
| class CodeGenOptions; |
| class FieldDecl; |
| class FunctionProtoType; |
| class ObjCInterfaceDecl; |
| class ObjCIvarDecl; |
| class PointerType; |
| class QualType; |
| class RecordDecl; |
| class TagDecl; |
| class TargetInfo; |
| class Type; |
| typedef CanQual<Type> CanQualType; |
| class GlobalDecl; |
| |
| namespace CodeGen { |
| class ABIInfo; |
| class CGCXXABI; |
| class CGRecordLayout; |
| class CodeGenModule; |
| class RequiredArgs; |
| |
| enum class StructorType { |
| Complete, // constructor or destructor |
| Base, // constructor or destructor |
| Deleting // destructor only |
| }; |
| |
| inline CXXCtorType toCXXCtorType(StructorType T) { |
| switch (T) { |
| case StructorType::Complete: |
| return Ctor_Complete; |
| case StructorType::Base: |
| return Ctor_Base; |
| case StructorType::Deleting: |
| llvm_unreachable("cannot have a deleting ctor"); |
| } |
| llvm_unreachable("not a StructorType"); |
| } |
| |
| inline StructorType getFromCtorType(CXXCtorType T) { |
| switch (T) { |
| case Ctor_Complete: |
| return StructorType::Complete; |
| case Ctor_Base: |
| return StructorType::Base; |
| case Ctor_Comdat: |
| llvm_unreachable("not expecting a COMDAT"); |
| case Ctor_CopyingClosure: |
| case Ctor_DefaultClosure: |
| llvm_unreachable("not expecting a closure"); |
| } |
| llvm_unreachable("not a CXXCtorType"); |
| } |
| |
| inline CXXDtorType toCXXDtorType(StructorType T) { |
| switch (T) { |
| case StructorType::Complete: |
| return Dtor_Complete; |
| case StructorType::Base: |
| return Dtor_Base; |
| case StructorType::Deleting: |
| return Dtor_Deleting; |
| } |
| llvm_unreachable("not a StructorType"); |
| } |
| |
| inline StructorType getFromDtorType(CXXDtorType T) { |
| switch (T) { |
| case Dtor_Deleting: |
| return StructorType::Deleting; |
| case Dtor_Complete: |
| return StructorType::Complete; |
| case Dtor_Base: |
| return StructorType::Base; |
| case Dtor_Comdat: |
| llvm_unreachable("not expecting a COMDAT"); |
| } |
| llvm_unreachable("not a CXXDtorType"); |
| } |
| |
| /// This class organizes the cross-module state that is used while lowering |
| /// AST types to LLVM types. |
| class CodeGenTypes { |
| CodeGenModule &CGM; |
| // Some of this stuff should probably be left on the CGM. |
| ASTContext &Context; |
| llvm::Module &TheModule; |
| const TargetInfo &Target; |
| CGCXXABI &TheCXXABI; |
| |
| // This should not be moved earlier, since its initialization depends on some |
| // of the previous reference members being already initialized |
| const ABIInfo &TheABIInfo; |
| |
| /// The opaque type map for Objective-C interfaces. All direct |
| /// manipulation is done by the runtime interfaces, which are |
| /// responsible for coercing to the appropriate type; these opaque |
| /// types are never refined. |
| llvm::DenseMap<const ObjCInterfaceType*, llvm::Type *> InterfaceTypes; |
| |
| /// Maps clang struct type with corresponding record layout info. |
| llvm::DenseMap<const Type*, CGRecordLayout *> CGRecordLayouts; |
| |
| /// Contains the LLVM IR type for any converted RecordDecl. |
| llvm::DenseMap<const Type*, llvm::StructType *> RecordDeclTypes; |
| |
| /// Hold memoized CGFunctionInfo results. |
| llvm::FoldingSet<CGFunctionInfo> FunctionInfos; |
| |
| /// This set keeps track of records that we're currently converting |
| /// to an IR type. For example, when converting: |
| /// struct A { struct B { int x; } } when processing 'x', the 'A' and 'B' |
| /// types will be in this set. |
| llvm::SmallPtrSet<const Type*, 4> RecordsBeingLaidOut; |
| |
| llvm::SmallPtrSet<const CGFunctionInfo*, 4> FunctionsBeingProcessed; |
| |
| /// True if we didn't layout a function due to a being inside |
| /// a recursive struct conversion, set this to true. |
| bool SkippedLayout; |
| |
| SmallVector<const RecordDecl *, 8> DeferredRecords; |
| |
| /// This map keeps cache of llvm::Types and maps clang::Type to |
| /// corresponding llvm::Type. |
| llvm::DenseMap<const Type *, llvm::Type *> TypeCache; |
| |
| llvm::SmallSet<const Type *, 8> RecordsWithOpaqueMemberPointers; |
| |
| unsigned ClangCallConvToLLVMCallConv(CallingConv CC); |
| |
| public: |
| CodeGenTypes(CodeGenModule &cgm); |
| ~CodeGenTypes(); |
| |
| const llvm::DataLayout &getDataLayout() const { |
| return TheModule.getDataLayout(); |
| } |
| ASTContext &getContext() const { return Context; } |
| const ABIInfo &getABIInfo() const { return TheABIInfo; } |
| const TargetInfo &getTarget() const { return Target; } |
| CGCXXABI &getCXXABI() const { return TheCXXABI; } |
| llvm::LLVMContext &getLLVMContext() { return TheModule.getContext(); } |
| |
| /// ConvertType - Convert type T into a llvm::Type. |
| llvm::Type *ConvertType(QualType T); |
| |
| /// \brief Converts the GlobalDecl into an llvm::Type. This should be used |
| /// when we know the target of the function we want to convert. This is |
| /// because some functions (explicitly, those with pass_object_size |
| /// parameters) may not have the same signature as their type portrays, and |
| /// can only be called directly. |
| llvm::Type *ConvertFunctionType(QualType FT, |
| const FunctionDecl *FD = nullptr); |
| |
| /// 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 *ConvertTypeForMem(QualType T); |
| |
| /// GetFunctionType - Get the LLVM function type for \arg Info. |
| llvm::FunctionType *GetFunctionType(const CGFunctionInfo &Info); |
| |
| llvm::FunctionType *GetFunctionType(GlobalDecl GD); |
| |
| /// isFuncTypeConvertible - Utility to check whether a function type can |
| /// be converted to an LLVM type (i.e. doesn't depend on an incomplete tag |
| /// type). |
| bool isFuncTypeConvertible(const FunctionType *FT); |
| bool isFuncParamTypeConvertible(QualType Ty); |
| |
| /// Determine if a C++ inheriting constructor should have parameters matching |
| /// those of its inherited constructor. |
| bool inheritingCtorHasParams(const InheritedConstructor &Inherited, |
| CXXCtorType Type); |
| |
| /// GetFunctionTypeForVTable - Get the LLVM function type for use in a vtable, |
| /// given a CXXMethodDecl. If the method to has an incomplete return type, |
| /// and/or incomplete argument types, this will return the opaque type. |
| llvm::Type *GetFunctionTypeForVTable(GlobalDecl GD); |
| |
| const CGRecordLayout &getCGRecordLayout(const RecordDecl*); |
| |
| /// UpdateCompletedType - When we find the full definition for a TagDecl, |
| /// replace the 'opaque' type we previously made for it if applicable. |
| void UpdateCompletedType(const TagDecl *TD); |
| |
| /// \brief Remove stale types from the type cache when an inheritance model |
| /// gets assigned to a class. |
| void RefreshTypeCacheForClass(const CXXRecordDecl *RD); |
| |
| // The arrangement methods are split into three families: |
| // - those meant to drive the signature and prologue/epilogue |
| // of a function declaration or definition, |
| // - those meant for the computation of the LLVM type for an abstract |
| // appearance of a function, and |
| // - those meant for performing the IR-generation of a call. |
| // They differ mainly in how they deal with optional (i.e. variadic) |
| // arguments, as well as unprototyped functions. |
| // |
| // Key points: |
| // - The CGFunctionInfo for emitting a specific call site must include |
| // entries for the optional arguments. |
| // - The function type used at the call site must reflect the formal |
| // signature of the declaration being called, or else the call will |
| // go awry. |
| // - For the most part, unprototyped functions are called by casting to |
| // a formal signature inferred from the specific argument types used |
| // at the call-site. However, some targets (e.g. x86-64) screw with |
| // this for compatibility reasons. |
| |
| const CGFunctionInfo &arrangeGlobalDeclaration(GlobalDecl GD); |
| |
| /// Given a function info for a declaration, return the function info |
| /// for a call with the given arguments. |
| /// |
| /// Often this will be able to simply return the declaration info. |
| const CGFunctionInfo &arrangeCall(const CGFunctionInfo &declFI, |
| const CallArgList &args); |
| |
| /// Free functions are functions that are compatible with an ordinary |
| /// C function pointer type. |
| const CGFunctionInfo &arrangeFunctionDeclaration(const FunctionDecl *FD); |
| const CGFunctionInfo &arrangeFreeFunctionCall(const CallArgList &Args, |
| const FunctionType *Ty, |
| bool ChainCall); |
| const CGFunctionInfo &arrangeFreeFunctionType(CanQual<FunctionProtoType> Ty, |
| const FunctionDecl *FD); |
| const CGFunctionInfo &arrangeFreeFunctionType(CanQual<FunctionNoProtoType> Ty); |
| |
| /// A nullary function is a freestanding function of type 'void ()'. |
| /// This method works for both calls and declarations. |
| const CGFunctionInfo &arrangeNullaryFunction(); |
| |
| /// A builtin function is a freestanding function using the default |
| /// C conventions. |
| const CGFunctionInfo & |
| arrangeBuiltinFunctionDeclaration(QualType resultType, |
| const FunctionArgList &args); |
| const CGFunctionInfo & |
| arrangeBuiltinFunctionDeclaration(CanQualType resultType, |
| ArrayRef<CanQualType> argTypes); |
| const CGFunctionInfo &arrangeBuiltinFunctionCall(QualType resultType, |
| const CallArgList &args); |
| |
| /// Objective-C methods are C functions with some implicit parameters. |
| const CGFunctionInfo &arrangeObjCMethodDeclaration(const ObjCMethodDecl *MD); |
| const CGFunctionInfo &arrangeObjCMessageSendSignature(const ObjCMethodDecl *MD, |
| QualType receiverType); |
| const CGFunctionInfo &arrangeUnprototypedObjCMessageSend( |
| QualType returnType, |
| const CallArgList &args); |
| |
| /// Block invocation functions are C functions with an implicit parameter. |
| const CGFunctionInfo &arrangeBlockFunctionDeclaration( |
| const FunctionProtoType *type, |
| const FunctionArgList &args); |
| const CGFunctionInfo &arrangeBlockFunctionCall(const CallArgList &args, |
| const FunctionType *type); |
| |
| /// C++ methods have some special rules and also have implicit parameters. |
| const CGFunctionInfo &arrangeCXXMethodDeclaration(const CXXMethodDecl *MD); |
| const CGFunctionInfo &arrangeCXXStructorDeclaration(const CXXMethodDecl *MD, |
| StructorType Type); |
| const CGFunctionInfo &arrangeCXXConstructorCall(const CallArgList &Args, |
| const CXXConstructorDecl *D, |
| CXXCtorType CtorKind, |
| unsigned ExtraArgs); |
| |
| const CGFunctionInfo &arrangeCXXMethodCall(const CallArgList &args, |
| const FunctionProtoType *type, |
| RequiredArgs required); |
| const CGFunctionInfo &arrangeMSMemberPointerThunk(const CXXMethodDecl *MD); |
| const CGFunctionInfo &arrangeMSCtorClosure(const CXXConstructorDecl *CD, |
| CXXCtorType CT); |
| const CGFunctionInfo &arrangeCXXMethodType(const CXXRecordDecl *RD, |
| const FunctionProtoType *FTP, |
| const CXXMethodDecl *MD); |
| |
| /// "Arrange" the LLVM information for a call or type with the given |
| /// signature. This is largely an internal method; other clients |
| /// should use one of the above routines, which ultimately defer to |
| /// this. |
| /// |
| /// \param argTypes - must all actually be canonical as params |
| const CGFunctionInfo &arrangeLLVMFunctionInfo(CanQualType returnType, |
| bool instanceMethod, |
| bool chainCall, |
| ArrayRef<CanQualType> argTypes, |
| FunctionType::ExtInfo info, |
| ArrayRef<FunctionProtoType::ExtParameterInfo> paramInfos, |
| RequiredArgs args); |
| |
| /// \brief Compute a new LLVM record layout object for the given record. |
| CGRecordLayout *ComputeRecordLayout(const RecordDecl *D, |
| llvm::StructType *Ty); |
| |
| /// addRecordTypeName - Compute a name from the given record decl with an |
| /// optional suffix and name the given LLVM type using it. |
| void addRecordTypeName(const RecordDecl *RD, llvm::StructType *Ty, |
| StringRef suffix); |
| |
| |
| public: // These are internal details of CGT that shouldn't be used externally. |
| /// ConvertRecordDeclType - Lay out a tagged decl type like struct or union. |
| llvm::StructType *ConvertRecordDeclType(const RecordDecl *TD); |
| |
| /// getExpandedTypes - Expand the type \arg Ty into the LLVM |
| /// argument types it would be passed as. See ABIArgInfo::Expand. |
| void getExpandedTypes(QualType Ty, |
| SmallVectorImpl<llvm::Type *>::iterator &TI); |
| |
| /// IsZeroInitializable - Return whether a type can be |
| /// zero-initialized (in the C++ sense) with an LLVM zeroinitializer. |
| bool isZeroInitializable(QualType T); |
| |
| /// Check if the pointer type can be zero-initialized (in the C++ sense) |
| /// with an LLVM zeroinitializer. |
| bool isPointerZeroInitializable(QualType T); |
| |
| /// IsZeroInitializable - Return whether a record type can be |
| /// zero-initialized (in the C++ sense) with an LLVM zeroinitializer. |
| bool isZeroInitializable(const RecordDecl *RD); |
| |
| bool isRecordLayoutComplete(const Type *Ty) const; |
| bool noRecordsBeingLaidOut() const { |
| return RecordsBeingLaidOut.empty(); |
| } |
| bool isRecordBeingLaidOut(const Type *Ty) const { |
| return RecordsBeingLaidOut.count(Ty); |
| } |
| |
| }; |
| |
| } // end namespace CodeGen |
| } // end namespace clang |
| |
| #endif |