class CodeGenTBAA

Declaration

class CodeGenTBAA { /* full declaration omitted */ };

Description

CodeGenTBAA - This class organizes the cross-module state that is used while lowering AST types to LLVM types.

Declared at: clang/lib/CodeGen/CodeGenTBAA.h:116

Member Variables

private clang::ASTContext& Context

private llvm::Module& Module

private const clang::CodeGenOptions& CodeGenOpts

private const clang::LangOptions& Features

private clang::MangleContext& MContext

private llvm::MDBuilder MDHelper

private llvm::DenseMap<const Type*, llvm::MDNode*> MetadataCache

MetadataCache - This maps clang::Types to scalar llvm::MDNodes describing them.

private llvm::DenseMap<const Type*, llvm::MDNode*> BaseTypeMetadataCache

This maps clang::Types to a base access type in the type DAG.

private llvm::DenseMap<TBAAAccessInfo, llvm::MDNode*> AccessTagMetadataCache

This maps TBAA access descriptors to tag nodes.

private llvm::DenseMap<const Type*, llvm::MDNode*> StructMetadataCache

StructMetadataCache - This maps clang::Types to llvm::MDNodes describing them for struct assignments.

private llvm::MDNode* Root

private llvm::MDNode* Char

Method Overview

• public CodeGenTBAA(clang::ASTContext & Ctx, llvm::Module & M, const clang::CodeGenOptions & CGO, const clang::LangOptions & Features, clang::MangleContext & MContext)
• private bool CollectFields(uint64_t BaseOffset, clang::QualType Ty, SmallVectorImpl<llvm::MDBuilder::TBAAStructField> & Fields, bool MayAlias)
• private llvm::MDNode * createScalarTypeNode(llvm::StringRef Name, llvm::MDNode * Parent, uint64_t Size)
• public clang::CodeGen::TBAAAccessInfo getAccessInfo(clang::QualType AccessType)
• public llvm::MDNode * getAccessTagInfo(clang::CodeGen::TBAAAccessInfo Info)
• public llvm::MDNode * getBaseTypeInfo(clang::QualType QTy)
• private llvm::MDNode * getBaseTypeInfoHelper(const clang::Type * Ty)
• private llvm::MDNode * getChar()
• private llvm::MDNode * getRoot()
• public llvm::MDNode * getTBAAStructInfo(clang::QualType QTy)
• public llvm::MDNode * getTypeInfo(clang::QualType QTy)
• private llvm::MDNode * getTypeInfoHelper(const clang::Type * Ty)
• public clang::CodeGen::TBAAAccessInfo getVTablePtrAccessInfo(llvm::Type * VTablePtrType)
• public clang::CodeGen::TBAAAccessInfo mergeTBAAInfoForCast(clang::CodeGen::TBAAAccessInfo SourceInfo, clang::CodeGen::TBAAAccessInfo TargetInfo)
• public clang::CodeGen::TBAAAccessInfo mergeTBAAInfoForConditionalOperator(clang::CodeGen::TBAAAccessInfo InfoA, clang::CodeGen::TBAAAccessInfo InfoB)
• public clang::CodeGen::TBAAAccessInfo mergeTBAAInfoForMemoryTransfer(clang::CodeGen::TBAAAccessInfo DestInfo, clang::CodeGen::TBAAAccessInfo SrcInfo)
• public ~CodeGenTBAA()

Methods

¶CodeGenTBAA(clang::ASTContext& Ctx,
            llvm::Module& M,
            const clang::CodeGenOptions& CGO,
            const clang::LangOptions& Features,
            clang::MangleContext& MContext)

Declared at: clang/lib/CodeGen/CodeGenTBAA.h:170

Parameters

clang::ASTContext& Ctx

llvm::Module& M

const clang::CodeGenOptions& CGO

const clang::LangOptions& Features

clang::MangleContext& MContext

¶bool CollectFields(
    uint64_t BaseOffset,
    clang::QualType Ty,
    SmallVectorImpl<
        llvm::MDBuilder::TBAAStructField>& Fields,
    bool MayAlias)

Description

CollectFields - Collect information about the fields of a type for !tbaa.struct metadata formation. Return false for an unsupported type.

Declared at: clang/lib/CodeGen/CodeGenTBAA.h:151

Parameters

uint64_t BaseOffset

clang::QualType Ty

SmallVectorImpl<llvm::MDBuilder::TBAAStructField>& Fields

bool MayAlias

¶llvm::MDNode* createScalarTypeNode(
    llvm::StringRef Name,
    llvm::MDNode* Parent,
    uint64_t Size)

Description

createScalarTypeNode - A wrapper function to create a metadata node describing a scalar type.

Declared at: clang/lib/CodeGen/CodeGenTBAA.h:158

Parameters

llvm::StringRef Name

llvm::MDNode* Parent

uint64_t Size

¶clang::CodeGen::TBAAAccessInfo getAccessInfo(
    clang::QualType AccessType)

Description

getAccessInfo - Get TBAA information that describes an access to an object of the given type.

Declared at: clang/lib/CodeGen/CodeGenTBAA.h:180

Parameters

clang::QualType AccessType

¶llvm::MDNode* getAccessTagInfo(
    clang::CodeGen::TBAAAccessInfo Info)

Description

getAccessTagInfo - Get TBAA tag for a given memory access.

Declared at: clang/lib/CodeGen/CodeGenTBAA.h:195

Parameters

clang::CodeGen::TBAAAccessInfo Info

¶llvm::MDNode* getBaseTypeInfo(clang::QualType QTy)

Description

getBaseTypeInfo - Get metadata that describes the given base access type. Return null if the type is not suitable for use in TBAA access tags.

Declared at: clang/lib/CodeGen/CodeGenTBAA.h:192

Parameters

clang::QualType QTy

¶llvm::MDNode* getBaseTypeInfoHelper(
    const clang::Type* Ty)

Description

getBaseTypeInfoHelper - An internal helper function to generate metadata used to describe accesses to objects of the given base type.

Declared at: clang/lib/CodeGen/CodeGenTBAA.h:167

Parameters

const clang::Type* Ty

¶llvm::MDNode* getChar()

Description

getChar - This is the mdnode for "char", which is special, and any types considered to be equivalent to it.

Declared at: clang/lib/CodeGen/CodeGenTBAA.h:147

¶llvm::MDNode* getRoot()

Description

getRoot - This is the mdnode for the root of the metadata type graph for this translation unit.

Declared at: clang/lib/CodeGen/CodeGenTBAA.h:143

¶llvm::MDNode* getTBAAStructInfo(
    clang::QualType QTy)

Description

getTBAAStructInfo - Get the TBAAStruct MDNode to be used for a memcpy of the given type.

Declared at: clang/lib/CodeGen/CodeGenTBAA.h:188

Parameters

clang::QualType QTy

¶llvm::MDNode* getTypeInfo(clang::QualType QTy)

Description

getTypeInfo - Get metadata used to describe accesses to objects of the given type.

Declared at: clang/lib/CodeGen/CodeGenTBAA.h:176

Parameters

clang::QualType QTy

¶llvm::MDNode* getTypeInfoHelper(
    const clang::Type* Ty)

Description

getTypeInfoHelper - An internal helper function to generate metadata used to describe accesses to objects of the given type.

Declared at: clang/lib/CodeGen/CodeGenTBAA.h:163

Parameters

const clang::Type* Ty

¶clang::CodeGen::TBAAAccessInfo
getVTablePtrAccessInfo(llvm::Type* VTablePtrType)

Description

getVTablePtrAccessInfo - Get the TBAA information that describes an access to a virtual table pointer.

Declared at: clang/lib/CodeGen/CodeGenTBAA.h:184

Parameters

llvm::Type* VTablePtrType

¶clang::CodeGen::TBAAAccessInfo
mergeTBAAInfoForCast(
    clang::CodeGen::TBAAAccessInfo SourceInfo,
    clang::CodeGen::TBAAAccessInfo TargetInfo)

Description

mergeTBAAInfoForCast - Get merged TBAA information for the purpose of type casts.

Declared at: clang/lib/CodeGen/CodeGenTBAA.h:199

Parameters

clang::CodeGen::TBAAAccessInfo SourceInfo

clang::CodeGen::TBAAAccessInfo TargetInfo

¶clang::CodeGen::TBAAAccessInfo
mergeTBAAInfoForConditionalOperator(
    clang::CodeGen::TBAAAccessInfo InfoA,
    clang::CodeGen::TBAAAccessInfo InfoB)

Description

mergeTBAAInfoForConditionalOperator - Get merged TBAA information for the purpose of conditional operator.

Declared at: clang/lib/CodeGen/CodeGenTBAA.h:204

Parameters

clang::CodeGen::TBAAAccessInfo InfoA

clang::CodeGen::TBAAAccessInfo InfoB

¶clang::CodeGen::TBAAAccessInfo
mergeTBAAInfoForMemoryTransfer(
    clang::CodeGen::TBAAAccessInfo DestInfo,
    clang::CodeGen::TBAAAccessInfo SrcInfo)

Description

mergeTBAAInfoForMemoryTransfer - Get merged TBAA information for the purpose of memory transfer calls.

Declared at: clang/lib/CodeGen/CodeGenTBAA.h:209

Parameters

clang::CodeGen::TBAAAccessInfo DestInfo

clang::CodeGen::TBAAAccessInfo SrcInfo

¶~CodeGenTBAA()

Declared at: clang/lib/CodeGen/CodeGenTBAA.h:172