forked from OSchip/llvm-project
74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
//===------- ItaniumCXXABI.cpp - AST support for the Itanium C++ ABI ------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This provides C++ AST support targeting the Itanium C++ ABI, which is
|
|
// documented at:
|
|
// http://www.codesourcery.com/public/cxx-abi/abi.html
|
|
// http://www.codesourcery.com/public/cxx-abi/abi-eh.html
|
|
//
|
|
// It also supports the closely-related ARM C++ ABI, documented at:
|
|
// http://infocenter.arm.com/help/topic/com.arm.doc.ihi0041c/IHI0041C_cppabi.pdf
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "CXXABI.h"
|
|
#include "clang/AST/ASTContext.h"
|
|
#include "clang/AST/RecordLayout.h"
|
|
#include "clang/AST/DeclCXX.h"
|
|
#include "clang/AST/Type.h"
|
|
#include "clang/Basic/TargetInfo.h"
|
|
|
|
using namespace clang;
|
|
|
|
namespace {
|
|
class ItaniumCXXABI : public CXXABI {
|
|
protected:
|
|
ASTContext &Context;
|
|
public:
|
|
ItaniumCXXABI(ASTContext &Ctx) : Context(Ctx) { }
|
|
|
|
unsigned getMemberPointerSize(const MemberPointerType *MPT) const {
|
|
QualType Pointee = MPT->getPointeeType();
|
|
if (Pointee->isFunctionType()) return 2;
|
|
return 1;
|
|
}
|
|
|
|
CallingConv getDefaultMethodCallConv(bool isVariadic) const {
|
|
return CC_C;
|
|
}
|
|
|
|
// We cheat and just check that the class has a vtable pointer, and that it's
|
|
// only big enough to have a vtable pointer and nothing more (or less).
|
|
bool isNearlyEmpty(const CXXRecordDecl *RD) const {
|
|
|
|
// Check that the class has a vtable pointer.
|
|
if (!RD->isDynamicClass())
|
|
return false;
|
|
|
|
const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD);
|
|
CharUnits PointerSize =
|
|
Context.toCharUnitsFromBits(Context.getTargetInfo().getPointerWidth(0));
|
|
return Layout.getNonVirtualSize() == PointerSize;
|
|
}
|
|
};
|
|
|
|
class ARMCXXABI : public ItaniumCXXABI {
|
|
public:
|
|
ARMCXXABI(ASTContext &Ctx) : ItaniumCXXABI(Ctx) { }
|
|
};
|
|
}
|
|
|
|
CXXABI *clang::CreateItaniumCXXABI(ASTContext &Ctx) {
|
|
return new ItaniumCXXABI(Ctx);
|
|
}
|
|
|
|
CXXABI *clang::CreateARMCXXABI(ASTContext &Ctx) {
|
|
return new ARMCXXABI(Ctx);
|
|
}
|