| //===--- 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 CLANG_CODEGEN_CODEGENTYPES_H |
| #define CLANG_CODEGEN_CODEGENTYPES_H |
| |
| #include "llvm/Module.h" |
| #include "llvm/ADT/DenseMap.h" |
| #include "llvm/ADT/SmallSet.h" |
| #include <vector> |
| |
| #include "CGCall.h" |
| #include "CGCXX.h" |
| |
| namespace llvm { |
| class FunctionType; |
| class Module; |
| class OpaqueType; |
| class PATypeHolder; |
| class TargetData; |
| class Type; |
| class LLVMContext; |
| } |
| |
| namespace clang { |
| class ABIInfo; |
| class ASTContext; |
| class CXXConstructorDecl; |
| class CXXDestructorDecl; |
| class CXXMethodDecl; |
| class FieldDecl; |
| class FunctionProtoType; |
| class ObjCInterfaceDecl; |
| class ObjCIvarDecl; |
| class PointerType; |
| class QualType; |
| class RecordDecl; |
| class TagDecl; |
| class TargetInfo; |
| class Type; |
| |
| namespace CodeGen { |
| class CodeGenTypes; |
| |
| /// CGRecordLayout - This class handles struct and union layout info while |
| /// lowering AST types to LLVM types. |
| class CGRecordLayout { |
| CGRecordLayout(); // DO NOT IMPLEMENT |
| |
| /// LLVMType - The LLVMType corresponding to this record layout. |
| const llvm::Type *LLVMType; |
| |
| /// ContainsPointerToDataMember - Whether one of the fields in this record |
| /// layout is a pointer to data member, or a struct that contains pointer to |
| /// data member. |
| bool ContainsPointerToDataMember; |
| |
| public: |
| CGRecordLayout(const llvm::Type *T, bool ContainsPointerToDataMember) |
| : LLVMType(T), ContainsPointerToDataMember(ContainsPointerToDataMember) { } |
| |
| /// getLLVMType - Return llvm type associated with this record. |
| const llvm::Type *getLLVMType() const { |
| return LLVMType; |
| } |
| |
| /// containsPointerToDataMember - Whether this struct contains pointers to |
| /// data members. |
| bool containsPointerToDataMember() const { |
| return ContainsPointerToDataMember; |
| } |
| }; |
| |
| /// CodeGenTypes - This class organizes the cross-module state that is used |
| /// while lowering AST types to LLVM types. |
| class CodeGenTypes { |
| ASTContext &Context; |
| const TargetInfo &Target; |
| llvm::Module& TheModule; |
| const llvm::TargetData& TheTargetData; |
| const ABIInfo& TheABIInfo; |
| |
| llvm::SmallVector<std::pair<QualType, |
| llvm::OpaqueType *>, 8> PointersToResolve; |
| |
| llvm::DenseMap<const Type*, llvm::PATypeHolder> TagDeclTypes; |
| |
| llvm::DenseMap<const Type*, llvm::PATypeHolder> FunctionTypes; |
| |
| /// 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*, const llvm::Type *> InterfaceTypes; |
| |
| /// CGRecordLayouts - This maps llvm struct type with corresponding |
| /// record layout info. |
| /// FIXME : If CGRecordLayout is less than 16 bytes then use |
| /// inline it in the map. |
| llvm::DenseMap<const Type*, CGRecordLayout *> CGRecordLayouts; |
| |
| /// FieldInfo - This maps struct field with corresponding llvm struct type |
| /// field no. This info is populated by record organizer. |
| llvm::DenseMap<const FieldDecl *, unsigned> FieldInfo; |
| |
| /// FunctionInfos - Hold memoized CGFunctionInfo results. |
| llvm::FoldingSet<CGFunctionInfo> FunctionInfos; |
| |
| public: |
| struct BitFieldInfo { |
| BitFieldInfo(unsigned FieldNo, |
| unsigned Start, |
| unsigned Size) |
| : FieldNo(FieldNo), Start(Start), Size(Size) {} |
| |
| unsigned FieldNo; |
| unsigned Start; |
| unsigned Size; |
| }; |
| |
| private: |
| llvm::DenseMap<const FieldDecl *, BitFieldInfo> BitFields; |
| |
| /// TypeCache - This map keeps cache of llvm::Types (through PATypeHolder) |
| /// and maps llvm::Types to corresponding clang::Type. llvm::PATypeHolder is |
| /// used instead of llvm::Type because it allows us to bypass potential |
| /// dangling type pointers due to type refinement on llvm side. |
| llvm::DenseMap<Type *, llvm::PATypeHolder> TypeCache; |
| |
| /// ConvertNewType - Convert type T into a llvm::Type. Do not use this |
| /// method directly because it does not do any type caching. This method |
| /// is available only for ConvertType(). CovertType() is preferred |
| /// interface to convert type T into a llvm::Type. |
| const llvm::Type *ConvertNewType(QualType T); |
| public: |
| CodeGenTypes(ASTContext &Ctx, llvm::Module &M, const llvm::TargetData &TD, |
| const ABIInfo &Info); |
| ~CodeGenTypes(); |
| |
| const llvm::TargetData &getTargetData() const { return TheTargetData; } |
| const TargetInfo &getTarget() const { return Target; } |
| ASTContext &getContext() const { return Context; } |
| const ABIInfo &getABIInfo() const { return TheABIInfo; } |
| llvm::LLVMContext &getLLVMContext() { return TheModule.getContext(); } |
| |
| /// ConvertType - Convert type T into a llvm::Type. |
| const llvm::Type *ConvertType(QualType T); |
| const llvm::Type *ConvertTypeRecursive(QualType T); |
| |
| /// 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 *ConvertTypeForMem(QualType T); |
| const llvm::Type *ConvertTypeForMemRecursive(QualType T); |
| |
| /// GetFunctionType - Get the LLVM function type for \arg Info. |
| const llvm::FunctionType *GetFunctionType(const CGFunctionInfo &Info, |
| bool IsVariadic); |
| |
| |
| /// 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. |
| const llvm::Type *GetFunctionTypeForVtable(const CXXMethodDecl *MD); |
| |
| const CGRecordLayout &getCGRecordLayout(const TagDecl*) const; |
| |
| /// getLLVMFieldNo - Return llvm::StructType element number |
| /// that corresponds to the field FD. |
| unsigned getLLVMFieldNo(const FieldDecl *FD); |
| |
| /// 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); |
| |
| private: |
| const CGFunctionInfo &getFunctionInfo(const FunctionNoProtoType *FTNP); |
| const CGFunctionInfo &getFunctionInfo(const FunctionProtoType *FTP); |
| |
| public: |
| /// getFunctionInfo - Get the function info for the specified function decl. |
| const CGFunctionInfo &getFunctionInfo(const FunctionDecl *FD); |
| const CGFunctionInfo &getFunctionInfo(const CXXMethodDecl *MD); |
| const CGFunctionInfo &getFunctionInfo(const ObjCMethodDecl *MD); |
| const CGFunctionInfo &getFunctionInfo(const CXXConstructorDecl *D, |
| CXXCtorType Type); |
| const CGFunctionInfo &getFunctionInfo(const CXXDestructorDecl *D, |
| CXXDtorType Type); |
| |
| // getFunctionInfo - Get the function info for a member function. |
| const CGFunctionInfo &getFunctionInfo(const CXXRecordDecl *RD, |
| const FunctionProtoType *FTP); |
| |
| /// getFunctionInfo - Get the function info for a function described by a |
| /// return type and argument types. If the calling convention is not |
| /// specified, the "C" calling convention will be used. |
| const CGFunctionInfo &getFunctionInfo(QualType ResTy, |
| const CallArgList &Args, |
| unsigned CallingConvention = 0); |
| const CGFunctionInfo &getFunctionInfo(QualType ResTy, |
| const FunctionArgList &Args, |
| unsigned CallingConvention = 0); |
| const CGFunctionInfo &getFunctionInfo(QualType RetTy, |
| const llvm::SmallVector<QualType, 16> &ArgTys, |
| unsigned CallingConvention = 0); |
| |
| public: // These are internal details of CGT that shouldn't be used externally. |
| /// addFieldInfo - Assign field number to field FD. |
| void addFieldInfo(const FieldDecl *FD, unsigned FieldNo); |
| |
| /// addBitFieldInfo - Assign a start bit and a size to field FD. |
| void addBitFieldInfo(const FieldDecl *FD, unsigned FieldNo, |
| unsigned Start, unsigned Size); |
| |
| /// getBitFieldInfo - Return the BitFieldInfo that corresponds to the field |
| /// FD. |
| BitFieldInfo getBitFieldInfo(const FieldDecl *FD); |
| |
| /// ConvertTagDeclType - Lay out a tagged decl type like struct or union or |
| /// enum. |
| const llvm::Type *ConvertTagDeclType(const TagDecl *TD); |
| |
| /// GetExpandedTypes - Expand the type \arg Ty into the LLVM |
| /// argument types it would be passed as on the provided vector \arg |
| /// ArgTys. See ABIArgInfo::Expand. |
| void GetExpandedTypes(QualType Ty, std::vector<const llvm::Type*> &ArgTys); |
| }; |
| |
| } // end namespace CodeGen |
| } // end namespace clang |
| |
| #endif |