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//===----- CXXABI.h - Interface to C++ ABIs ---------------------*- C++ -*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// This provides an abstract class for C++ AST support. Concrete
// subclasses of this implement AST support for specific C++ ABIs.
#include "clang/AST/Type.h"
namespace clang {
class ASTContext;
class CXXConstructorDecl;
class DeclaratorDecl;
class Expr;
class MemberPointerType;
class MangleNumberingContext;
/// Implements C++ ABI-specific semantic analysis functions.
class CXXABI {
virtual ~CXXABI();
struct MemberPointerInfo {
uint64_t Width;
unsigned Align;
bool HasPadding;
/// Returns the width and alignment of a member pointer in bits, as well as
/// whether it has padding.
virtual MemberPointerInfo
getMemberPointerInfo(const MemberPointerType *MPT) const = 0;
/// Returns the default calling convention for C++ methods.
virtual CallingConv getDefaultMethodCallConv(bool isVariadic) const = 0;
/// Returns whether the given class is nearly empty, with just virtual
/// pointers and no data except possibly virtual bases.
virtual bool isNearlyEmpty(const CXXRecordDecl *RD) const = 0;
/// Returns a new mangling number context for this C++ ABI.
virtual std::unique_ptr<MangleNumberingContext>
createMangleNumberingContext() const = 0;
/// Adds a mapping from class to copy constructor for this C++ ABI.
virtual void addCopyConstructorForExceptionObject(CXXRecordDecl *,
CXXConstructorDecl *) = 0;
/// Retrieves the mapping from class to copy constructor for this C++ ABI.
virtual const CXXConstructorDecl *
getCopyConstructorForExceptionObject(CXXRecordDecl *) = 0;
virtual void addTypedefNameForUnnamedTagDecl(TagDecl *TD,
TypedefNameDecl *DD) = 0;
virtual TypedefNameDecl *
getTypedefNameForUnnamedTagDecl(const TagDecl *TD) = 0;
virtual void addDeclaratorForUnnamedTagDecl(TagDecl *TD,
DeclaratorDecl *DD) = 0;
virtual DeclaratorDecl *getDeclaratorForUnnamedTagDecl(const TagDecl *TD) = 0;
/// Creates an instance of a C++ ABI class.
CXXABI *CreateItaniumCXXABI(ASTContext &Ctx);
CXXABI *CreateMicrosoftCXXABI(ASTContext &Ctx);