74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
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//===------- ItaniumCXXABI.cpp - AST support for the Itanium 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 Itanium C++ ABI, which is
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// documented at:
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// http://www.codesourcery.com/public/cxx-abi/abi.html
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// http://www.codesourcery.com/public/cxx-abi/abi-eh.html
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//
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// It also supports the closely-related ARM C++ ABI, documented at:
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// http://infocenter.arm.com/help/topic/com.arm.doc.ihi0041c/IHI0041C_cppabi.pdf
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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/RecordLayout.h"
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#include "clang/AST/DeclCXX.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 ItaniumCXXABI : public CXXABI {
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protected:
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ASTContext &Context;
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public:
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ItaniumCXXABI(ASTContext &Ctx) : Context(Ctx) { }
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unsigned getMemberPointerSize(const MemberPointerType *MPT) const {
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QualType Pointee = MPT->getPointeeType();
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if (Pointee->isFunctionType()) return 2;
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return 1;
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}
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CallingConv getDefaultMethodCallConv() const {
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return CC_C;
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}
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// We cheat and just check that the class has a vtable pointer, and that it's
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// only big enough to have a vtable pointer and nothing more (or less).
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bool isNearlyEmpty(const CXXRecordDecl *RD) const {
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// Check that the class has a vtable pointer.
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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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CharUnits PointerSize =
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Context.toCharUnitsFromBits(Context.getTargetInfo().getPointerWidth(0));
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return Layout.getNonVirtualSize() == PointerSize;
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}
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};
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class ARMCXXABI : public ItaniumCXXABI {
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public:
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ARMCXXABI(ASTContext &Ctx) : ItaniumCXXABI(Ctx) { }
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};
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}
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CXXABI *clang::CreateItaniumCXXABI(ASTContext &Ctx) {
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return new ItaniumCXXABI(Ctx);
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}
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CXXABI *clang::CreateARMCXXABI(ASTContext &Ctx) {
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return new ARMCXXABI(Ctx);
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}
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