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