72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
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//===------- MicrosoftCXXABI.cpp - AST support for the Microsoft C++ ABI --===//
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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 provides C++ AST support targeting the Microsoft Visual C++
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// ABI.
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//
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//===----------------------------------------------------------------------===//
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#include "CXXABI.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/DeclCXX.h"
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#include "clang/AST/RecordLayout.h"
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#include "clang/AST/Type.h"
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#include "clang/Basic/TargetInfo.h"
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using namespace clang;
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namespace {
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class MicrosoftCXXABI : public CXXABI {
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ASTContext &Context;
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public:
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MicrosoftCXXABI(ASTContext &Ctx) : Context(Ctx) { }
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unsigned getMemberPointerSize(const MemberPointerType *MPT) const;
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CallingConv getDefaultMethodCallConv() const {
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if (Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86)
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return CC_X86ThisCall;
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else
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return CC_C;
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}
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bool isNearlyEmpty(const CXXRecordDecl *RD) const {
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// FIXME: Audit the corners
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if (!RD->isDynamicClass())
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return false;
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const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD);
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// In the Microsoft ABI, classes can have one or two vtable pointers.
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CharUnits PointerSize =
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Context.toCharUnitsFromBits(Context.getTargetInfo().getPointerWidth(0));
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return Layout.getNonVirtualSize() == PointerSize ||
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Layout.getNonVirtualSize() == PointerSize * 2;
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}
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};
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}
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unsigned MicrosoftCXXABI::getMemberPointerSize(const MemberPointerType *MPT) const {
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QualType Pointee = MPT->getPointeeType();
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CXXRecordDecl *RD = MPT->getClass()->getAsCXXRecordDecl();
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if (RD->getNumVBases() > 0) {
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if (Pointee->isFunctionType())
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return 3;
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else
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return 2;
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} else if (RD->getNumBases() > 1 && Pointee->isFunctionType())
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return 2;
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return 1;
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}
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CXXABI *clang::CreateMicrosoftCXXABI(ASTContext &Ctx) {
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return new MicrosoftCXXABI(Ctx);
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}
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