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//===--- 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.
#include "llvm/Module.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallSet.h"
#include <vector>
#include "CGCall.h"
namespace llvm {
class FunctionType;
class Module;
class OpaqueType;
class PATypeHolder;
class TargetData;
class Type;
class LLVMContext;
namespace clang {
class ABIInfo;
class ASTContext;
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
CGRecordLayout(const llvm::Type *T,
const 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.
const llvm::Type *getLLVMType() const {
return STy;
bool isPaddingField(unsigned No) const {
return PaddingFields.count(No) != 0;
unsigned getNumPaddingFields() {
return PaddingFields.size();
const 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;
mutable const ABIInfo* TheABIInfo;
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;
struct BitFieldInfo {
BitFieldInfo(unsigned FieldNo,
unsigned Start,
unsigned Size)
: FieldNo(FieldNo), Start(Start), Size(Size) {}
unsigned FieldNo;
unsigned Start;
unsigned Size;
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);
CodeGenTypes(ASTContext &Ctx, llvm::Module &M, const llvm::TargetData &TD);
const llvm::TargetData &getTargetData() const { return TheTargetData; }
TargetInfo &getTarget() const { return Target; }
ASTContext &getContext() const { return Context; }
const ABIInfo &getABIInfo() const;
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);
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);
/// getFunctionInfo - Get the CGFunctionInfo for this function signature.
const CGFunctionInfo &getFunctionInfo(QualType RetTy,
const llvm::SmallVector<QualType,16>
const CGFunctionInfo &getFunctionInfo(const FunctionNoProtoType *FTNP);
const CGFunctionInfo &getFunctionInfo(const FunctionProtoType *FTP);
const CGFunctionInfo &getFunctionInfo(const FunctionDecl *FD);
const CGFunctionInfo &getFunctionInfo(const CXXMethodDecl *MD);
const CGFunctionInfo &getFunctionInfo(const ObjCMethodDecl *MD);
const CGFunctionInfo &getFunctionInfo(QualType ResTy,
const CallArgList &Args);
const CGFunctionInfo &getFunctionInfo(QualType ResTy,
const FunctionArgList &Args);
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