| //===--- 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/ADT/DenseMap.h" |
| #include "llvm/ADT/SmallSet.h" |
| #include <vector> |
| |
| namespace llvm { |
| class Module; |
| class Type; |
| class OpaqueType; |
| class PATypeHolder; |
| class TargetData; |
| } |
| |
| namespace clang { |
| class ASTContext; |
| class TagDecl; |
| class TargetInfo; |
| class QualType; |
| class PointerType; |
| class PointerLikeType; |
| class Type; |
| class FunctionTypeProto; |
| class FieldDecl; |
| class RecordDecl; |
| class ObjCInterfaceDecl; |
| class ObjCIvarDecl; |
| |
| 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 |
| public: |
| CGRecordLayout(llvm::Type *T, llvm::SmallSet<unsigned, 8> &PF) |
| : STy(T), PaddingFields(PF) { |
| // FIXME : Collect info about fields that requires adjustments |
| // (i.e. fields that do not directly map to llvm struct fields.) |
| } |
| |
| /// getLLVMType - Return llvm type associated with this record. |
| llvm::Type *getLLVMType() const { |
| return STy; |
| } |
| |
| bool isPaddingField(unsigned No) const { |
| return PaddingFields.count(No) != 0; |
| } |
| |
| unsigned getNumPaddingFields() { |
| return PaddingFields.size(); |
| } |
| |
| private: |
| llvm::Type *STy; |
| llvm::SmallSet<unsigned, 8> PaddingFields; |
| }; |
| |
| /// CodeGenTypes - This class organizes the cross-module state that is used |
| /// while lowering AST types to LLVM types. |
| class CodeGenTypes { |
| ASTContext &Context; |
| TargetInfo &Target; |
| llvm::Module& TheModule; |
| const llvm::TargetData& TheTargetData; |
| |
| |
| llvm::SmallVector<std::pair<const PointerLikeType *, |
| llvm::OpaqueType *>, 8> PointersToResolve; |
| |
| llvm::DenseMap<const TagDecl*, llvm::PATypeHolder> TagDeclTypes; |
| |
| /// 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 TagDecl*, 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; |
| llvm::DenseMap<const ObjCIvarDecl *, unsigned> ObjCIvarInfo; |
| |
| public: |
| class BitFieldInfo { |
| public: |
| explicit BitFieldInfo(unsigned short B, unsigned short S) |
| : Begin(B), Size(S) {} |
| |
| unsigned short Begin; |
| unsigned short 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); |
| ~CodeGenTypes(); |
| |
| const llvm::TargetData &getTargetData() const { return TheTargetData; } |
| TargetInfo &getTarget() const { return Target; } |
| ASTContext &getContext() const { return Context; } |
| |
| /// ConvertType - Convert type T into a llvm::Type. |
| const llvm::Type *ConvertType(QualType T); |
| const llvm::Type *ConvertTypeRecursive(QualType T); |
| /// ConvertReturnType - Convert T into an llvm::Type assuming that it will be |
| /// used as a function return type. |
| const llvm::Type *ConvertReturnType(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); |
| |
| void CollectObjCIvarTypes(ObjCInterfaceDecl *ObjCClass, |
| std::vector<const llvm::Type*> &IvarTypes); |
| |
| const CGRecordLayout *getCGRecordLayout(const TagDecl*) const; |
| /// Returns a StructType representing an Objective-C object |
| const llvm::Type *ConvertObjCInterfaceToStruct(const ObjCInterfaceDecl *OID); |
| |
| /// getLLVMFieldNo - Return llvm::StructType element number |
| /// that corresponds to the field FD. |
| unsigned getLLVMFieldNo(const FieldDecl *FD); |
| unsigned getLLVMFieldNo(const ObjCIvarDecl *OID); |
| |
| |
| /// 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); |
| |
| public: // These are internal details of CGT that shouldn't be used externally. |
| void DecodeArgumentTypes(const FunctionTypeProto &FTP, |
| std::vector<const llvm::Type*> &ArgTys); |
| |
| /// addFieldInfo - Assign field number to field FD. |
| void addFieldInfo(const FieldDecl *FD, unsigned No); |
| |
| /// addBitFieldInfo - Assign a start bit and a size to field FD. |
| void addBitFieldInfo(const FieldDecl *FD, unsigned Begin, 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); |
| }; |
| |
| } // end namespace CodeGen |
| } // end namespace clang |
| |
| #endif |