class CGRecordLayout

Declaration

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

Description

CGRecordLayout - This class handles struct and union layout info while lowering AST types to LLVM types. These layout objects are only created on demand as IR generation requires.

Declared at: clang/lib/CodeGen/CGRecordLayout.h:121

Member Variables

private llvm::StructType* CompleteObjectType
The LLVM type corresponding to this record layout; used when laying it out as a complete object.
private llvm::StructType* BaseSubobjectType
The LLVM type for the non-virtual part of this record layout; used when laying it out as a base subobject.
private llvm::DenseMap<const FieldDecl*, unsigned int> FieldInfo
Map from (non-bit-field) struct field to the corresponding llvm struct type field no. This info is populated by record builder.
private llvm::DenseMap<const FieldDecl*, CGBitFieldInfo> BitFields
Map from (bit-field) struct field to the corresponding llvm struct type field no. This info is populated by record builder.
private llvm::DenseMap<const CXXRecordDecl*, unsigned int> NonVirtualBases
private llvm::DenseMap<const CXXRecordDecl*, unsigned int> CompleteObjectVirtualBases
Map from virtual bases to their field index in the complete object.
private bool IsZeroInitializable
False if any direct or indirect subobject of this class, when considered as a complete object, requires a non-zero bitpattern when zero-initialized.
private bool IsZeroInitializableAsBase
False if any direct or indirect subobject of this class, when considered as a base subobject, requires a non-zero bitpattern when zero-initialized.

Method Overview

Methods

CGRecordLayout(
    const clang::CodeGen::CGRecordLayout&)

Declared at: clang/lib/CodeGen/CGRecordLayout.h:124

Parameters

const clang::CodeGen::CGRecordLayout& 

CGRecordLayout(
    llvm::StructType* CompleteObjectType,
    llvm::StructType* BaseSubobjectType,
    bool IsZeroInitializable,
    bool IsZeroInitializableAsBase)

Declared at: clang/lib/CodeGen/CGRecordLayout.h:162

Parameters

llvm::StructType* CompleteObjectType
llvm::StructType* BaseSubobjectType
bool IsZeroInitializable
bool IsZeroInitializableAsBase

void dump() const

Declared at: clang/lib/CodeGen/CGRecordLayout.h:232

llvm::StructType* getBaseSubobjectLLVMType() const

Description

Return the "base subobject" LLVM type associated with this record.

Declared at: clang/lib/CodeGen/CGRecordLayout.h:179

const clang::CodeGen::CGBitFieldInfo&
getBitFieldInfo(const clang::FieldDecl* FD) const

Description

Return the BitFieldInfo that corresponds to the field FD.

Declared at: clang/lib/CodeGen/CGRecordLayout.h:222

Parameters

const clang::FieldDecl* FD

unsigned int getLLVMFieldNo(
    const clang::FieldDecl* FD) const

Description

Return llvm::StructType element number that corresponds to the field FD.

Declared at: clang/lib/CodeGen/CGRecordLayout.h:197

Parameters

const clang::FieldDecl* FD

llvm::StructType* getLLVMType() const

Description

Return the "complete object" LLVM type associated with this record.

Declared at: clang/lib/CodeGen/CGRecordLayout.h:173

unsigned int getNonVirtualBaseLLVMFieldNo(
    const clang::CXXRecordDecl* RD) const

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

Parameters

const clang::CXXRecordDecl* RD

unsigned int getVirtualBaseIndex(
    const clang::CXXRecordDecl* base) const

Description

Return the LLVM field index corresponding to the given virtual base. Only valid when operating on the complete object.

Declared at: clang/lib/CodeGen/CGRecordLayout.h:216

Parameters

const clang::CXXRecordDecl* base

bool hasNonVirtualBaseLLVMField(
    const clang::CXXRecordDecl* RD) const

Declared at: clang/lib/CodeGen/CGRecordLayout.h:205

Parameters

const clang::CXXRecordDecl* RD

bool isZeroInitializable() const

Description

Check whether this struct can be C++ zero-initialized with a zeroinitializer.

Declared at: clang/lib/CodeGen/CGRecordLayout.h:185

bool isZeroInitializableAsBase() const

Description

Check whether this struct can be C++ zero-initialized with a zeroinitializer when considered as a base subobject.

Declared at: clang/lib/CodeGen/CGRecordLayout.h:191

void print(llvm::raw_ostream& OS) const

Declared at: clang/lib/CodeGen/CGRecordLayout.h:231

Parameters

llvm::raw_ostream& OS