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//===--- CodeGenTBAA.h - TBAA information 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 manages TBAA information and defines the TBAA policy
// for the optimizer to use.
//
//===----------------------------------------------------------------------===//
#ifndef CLANG_CODEGEN_CODEGENTBAA_H
#define CLANG_CODEGEN_CODEGENTBAA_H
#include "clang/Basic/LLVM.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/Support/MDBuilder.h"
namespace llvm {
class LLVMContext;
class MDNode;
}
namespace clang {
class ASTContext;
class LangOptions;
class MangleContext;
class QualType;
class Type;
namespace CodeGen {
class CGRecordLayout;
/// CodeGenTBAA - This class organizes the cross-module state that is used
/// while lowering AST types to LLVM types.
class CodeGenTBAA {
ASTContext &Context;
llvm::LLVMContext& VMContext;
const LangOptions &Features;
MangleContext &MContext;
// MDHelper - Helper for creating metadata.
llvm::MDBuilder MDHelper;
/// MetadataCache - This maps clang::Types to llvm::MDNodes describing them.
llvm::DenseMap<const Type *, llvm::MDNode *> MetadataCache;
llvm::MDNode *Root;
llvm::MDNode *Char;
/// getRoot - This is the mdnode for the root of the metadata type graph
/// for this translation unit.
llvm::MDNode *getRoot();
/// getChar - This is the mdnode for "char", which is special, and any types
/// considered to be equivalent to it.
llvm::MDNode *getChar();
public:
CodeGenTBAA(ASTContext &Ctx, llvm::LLVMContext &VMContext,
const LangOptions &Features,
MangleContext &MContext);
~CodeGenTBAA();
/// getTBAAInfo - Get the TBAA MDNode to be used for a dereference
/// of the given type.
llvm::MDNode *getTBAAInfo(QualType QTy);
/// getTBAAInfoForVTablePtr - Get the TBAA MDNode to be used for a
/// dereference of a vtable pointer.
llvm::MDNode *getTBAAInfoForVTablePtr();
};
} // end namespace CodeGen
} // end namespace clang
#endif
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