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e8bbc12152
builtin types (When requested). This is another step toward making ASTUnit build the ASTContext as needed when loading an AST file, rather than doing so after the fact. No actual functionality change (yet). llvm-svn: 138985
74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
//===------- 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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