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//===--- CodeGenTypes.h - Type translation for LLVM CodeGen -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and 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 CODEGEN_CODEGENTYPES_H
#define CODEGEN_CODEGENTYPES_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallVector.h"
#include <vector>
namespace llvm {
class Module;
class Type;
}
namespace clang {
class ASTContext;
class TagDecl;
class TargetInfo;
class QualType;
class FunctionTypeProto;
class FieldDecl;
namespace CodeGen {
class CodeGenTypes;
/// RecordOrganizer - This helper class, used by RecordLayoutInfo, layouts
/// structs and unions. It manages transient information used during layout.
/// FIXME : At the moment assume
/// - one to one mapping between AST FieldDecls and
/// llvm::StructType elements.
/// - Ignore bit fields
/// - Ignore field aligments
/// - Ignore packed structs
class RecordOrganizer {
public:
RecordOrganizer() : STy(NULL) {}
/// addField - Add new field.
void addField(const FieldDecl *FD);
/// layoutFields - Do the actual work and lay out all fields. Create
/// corresponding llvm struct type. This should be invoked only after
/// all fields are added.
void layoutFields(CodeGenTypes &CGT);
/// getLLVMType - Return associated llvm struct type. This may be NULL
/// if fields are not laid out.
llvm::Type *getLLVMType() {
return STy;
}
private:
llvm::Type *STy;
llvm::SmallVector<const FieldDecl *, 8> FieldDecls;
};
/// RecordLayoutInfo - This class handles struct and union layout info while
/// lowering AST types to LLVM types.
class RecordLayoutInfo {
RecordLayoutInfo(); // DO NOT IMPLEMENT
public:
RecordLayoutInfo(RecordOrganizer *RO);
/// getLLVMType - Return llvm type associated with this record.
llvm::Type *getLLVMType() {
return STy;
}
private:
llvm::Type *STy;
};
/// 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;
llvm::DenseMap<const TagDecl*, llvm::Type*> TagDeclTypes;
/// RecordLayouts - This maps llvm struct type with corresponding
/// record layout info.
llvm::DenseMap<const llvm::Type*, RecordLayoutInfo *> RecordLayouts;
/// 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;
public:
CodeGenTypes(ASTContext &Ctx, llvm::Module &M);
~CodeGenTypes();
TargetInfo &getTarget() const { return Target; }
const llvm::Type *ConvertType(QualType T);
void DecodeArgumentTypes(const FunctionTypeProto &FTP,
std::vector<const llvm::Type*> &ArgTys);
RecordLayoutInfo *getRecordLayoutInfo(const llvm::Type*);
/// getLLVMFieldNo - Return llvm::StructType element number
/// that corresponds to the field FD.
unsigned getLLVMFieldNo(const FieldDecl *FD);
/// addFieldInfo - Assign field number to field FD.
void addFieldInfo(const FieldDecl *FD, unsigned No);
};
} // end namespace CodeGen
} // end namespace clang
#endif
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