зеркало из https://github.com/microsoft/clang-1.git
206 строки
7.2 KiB
C++
206 строки
7.2 KiB
C++
//===--- CodeGenTypes.h - Type translation for LLVM CodeGen -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This is the code that handles AST -> LLVM type lowering.
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//
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//===----------------------------------------------------------------------===//
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#ifndef CLANG_CODEGEN_CODEGENTYPES_H
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#define CLANG_CODEGEN_CODEGENTYPES_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallSet.h"
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#include <vector>
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#include "CGCall.h"
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namespace llvm {
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class FunctionType;
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class Module;
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class OpaqueType;
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class PATypeHolder;
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class TargetData;
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class Type;
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}
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namespace clang {
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class ABIInfo;
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class ASTContext;
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class FieldDecl;
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class FunctionProtoType;
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class ObjCInterfaceDecl;
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class ObjCIvarDecl;
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class PointerType;
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class QualType;
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class RecordDecl;
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class TagDecl;
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class TargetInfo;
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class Type;
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namespace CodeGen {
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class CodeGenTypes;
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/// CGRecordLayout - This class handles struct and union layout info while
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/// lowering AST types to LLVM types.
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class CGRecordLayout {
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CGRecordLayout(); // DO NOT IMPLEMENT
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public:
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CGRecordLayout(llvm::Type *T, llvm::SmallSet<unsigned, 8> &PF)
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: STy(T), PaddingFields(PF) {
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// FIXME : Collect info about fields that requires adjustments
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// (i.e. fields that do not directly map to llvm struct fields.)
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}
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/// getLLVMType - Return llvm type associated with this record.
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llvm::Type *getLLVMType() const {
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return STy;
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}
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bool isPaddingField(unsigned No) const {
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return PaddingFields.count(No) != 0;
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}
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unsigned getNumPaddingFields() {
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return PaddingFields.size();
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}
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private:
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llvm::Type *STy;
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llvm::SmallSet<unsigned, 8> PaddingFields;
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};
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/// CodeGenTypes - This class organizes the cross-module state that is used
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/// while lowering AST types to LLVM types.
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class CodeGenTypes {
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ASTContext &Context;
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TargetInfo &Target;
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llvm::Module& TheModule;
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const llvm::TargetData& TheTargetData;
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mutable const ABIInfo* TheABIInfo;
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llvm::SmallVector<std::pair<QualType,
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llvm::OpaqueType *>, 8> PointersToResolve;
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llvm::DenseMap<const Type*, llvm::PATypeHolder> TagDeclTypes;
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llvm::DenseMap<const Type*, llvm::PATypeHolder> FunctionTypes;
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/// CGRecordLayouts - This maps llvm struct type with corresponding
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/// record layout info.
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/// FIXME : If CGRecordLayout is less than 16 bytes then use
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/// inline it in the map.
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llvm::DenseMap<const Type*, CGRecordLayout *> CGRecordLayouts;
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/// FieldInfo - This maps struct field with corresponding llvm struct type
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/// field no. This info is populated by record organizer.
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llvm::DenseMap<const FieldDecl *, unsigned> FieldInfo;
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/// FunctionInfos - Hold memoized CGFunctionInfo results.
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llvm::FoldingSet<CGFunctionInfo> FunctionInfos;
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public:
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class BitFieldInfo {
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public:
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explicit BitFieldInfo(unsigned short B, unsigned short S)
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: Begin(B), Size(S) {}
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unsigned short Begin;
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unsigned short Size;
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};
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private:
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llvm::DenseMap<const FieldDecl *, BitFieldInfo> BitFields;
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/// TypeCache - This map keeps cache of llvm::Types (through PATypeHolder)
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/// and maps llvm::Types to corresponding clang::Type. llvm::PATypeHolder is
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/// used instead of llvm::Type because it allows us to bypass potential
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/// dangling type pointers due to type refinement on llvm side.
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llvm::DenseMap<Type *, llvm::PATypeHolder> TypeCache;
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/// ConvertNewType - Convert type T into a llvm::Type. Do not use this
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/// method directly because it does not do any type caching. This method
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/// is available only for ConvertType(). CovertType() is preferred
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/// interface to convert type T into a llvm::Type.
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const llvm::Type *ConvertNewType(QualType T);
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public:
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CodeGenTypes(ASTContext &Ctx, llvm::Module &M, const llvm::TargetData &TD);
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~CodeGenTypes();
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const llvm::TargetData &getTargetData() const { return TheTargetData; }
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TargetInfo &getTarget() const { return Target; }
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ASTContext &getContext() const { return Context; }
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const ABIInfo &getABIInfo() const;
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/// ConvertType - Convert type T into a llvm::Type.
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const llvm::Type *ConvertType(QualType T);
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const llvm::Type *ConvertTypeRecursive(QualType T);
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/// ConvertTypeForMem - Convert type T into a llvm::Type. This differs from
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/// ConvertType in that it is used to convert to the memory representation for
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/// a type. For example, the scalar representation for _Bool is i1, but the
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/// memory representation is usually i8 or i32, depending on the target.
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const llvm::Type *ConvertTypeForMem(QualType T);
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const llvm::Type *ConvertTypeForMemRecursive(QualType T);
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/// GetFunctionType - Get the LLVM function type for \arg Info.
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const llvm::FunctionType *GetFunctionType(const CGFunctionInfo &Info,
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bool IsVariadic);
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const CGRecordLayout *getCGRecordLayout(const TagDecl*) const;
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/// Returns a StructType representing an Objective-C object
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const llvm::Type *ConvertObjCInterfaceToStruct(const ObjCInterfaceDecl *OID);
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/// getLLVMFieldNo - Return llvm::StructType element number
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/// that corresponds to the field FD.
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unsigned getLLVMFieldNo(const FieldDecl *FD);
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/// UpdateCompletedType - When we find the full definition for a TagDecl,
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/// replace the 'opaque' type we previously made for it if applicable.
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void UpdateCompletedType(const TagDecl *TD);
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/// getFunctionInfo - Get the CGFunctionInfo for this function signature.
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const CGFunctionInfo &getFunctionInfo(QualType RetTy,
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const llvm::SmallVector<QualType,16>
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&ArgTys);
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const CGFunctionInfo &getFunctionInfo(const FunctionNoProtoType *FTNP);
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const CGFunctionInfo &getFunctionInfo(const FunctionProtoType *FTP);
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const CGFunctionInfo &getFunctionInfo(const FunctionDecl *FD);
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const CGFunctionInfo &getFunctionInfo(const ObjCMethodDecl *MD);
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const CGFunctionInfo &getFunctionInfo(QualType ResTy,
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const CallArgList &Args);
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const CGFunctionInfo &getFunctionInfo(QualType ResTy,
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const FunctionArgList &Args);
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public: // These are internal details of CGT that shouldn't be used externally.
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/// addFieldInfo - Assign field number to field FD.
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void addFieldInfo(const FieldDecl *FD, unsigned No);
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/// addBitFieldInfo - Assign a start bit and a size to field FD.
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void addBitFieldInfo(const FieldDecl *FD, unsigned Begin, unsigned Size);
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/// getBitFieldInfo - Return the BitFieldInfo that corresponds to the field
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/// FD.
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BitFieldInfo getBitFieldInfo(const FieldDecl *FD);
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/// ConvertTagDeclType - Lay out a tagged decl type like struct or union or
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/// enum.
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const llvm::Type *ConvertTagDeclType(const TagDecl *TD);
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/// GetExpandedTypes - Expand the type \arg Ty into the LLVM
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/// argument types it would be passed as on the provided vector \arg
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/// ArgTys. See ABIArgInfo::Expand.
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void GetExpandedTypes(QualType Ty, std::vector<const llvm::Type*> &ArgTys);
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};
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} // end namespace CodeGen
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} // end namespace clang
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#endif
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