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-rw-r--r--clang/lib/AST/MicrosoftCXXABI.cpp71
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diff --git a/clang/lib/AST/MicrosoftCXXABI.cpp b/clang/lib/AST/MicrosoftCXXABI.cpp
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+//===------- MicrosoftCXXABI.cpp - AST support for the Microsoft 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 Microsoft Visual C++
+// ABI.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CXXABI.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/DeclCXX.h"
+#include "clang/AST/RecordLayout.h"
+#include "clang/AST/Type.h"
+#include "clang/Basic/TargetInfo.h"
+
+using namespace clang;
+
+namespace {
+class MicrosoftCXXABI : public CXXABI {
+ ASTContext &Context;
+public:
+ MicrosoftCXXABI(ASTContext &Ctx) : Context(Ctx) { }
+
+ unsigned getMemberPointerSize(const MemberPointerType *MPT) const;
+
+ CallingConv getDefaultMethodCallConv() const {
+ if (Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86)
+ return CC_X86ThisCall;
+ else
+ return CC_C;
+ }
+
+ bool isNearlyEmpty(const CXXRecordDecl *RD) const {
+ // FIXME: Audit the corners
+ if (!RD->isDynamicClass())
+ return false;
+
+ const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD);
+
+ // In the Microsoft ABI, classes can have one or two vtable pointers.
+ CharUnits PointerSize =
+ Context.toCharUnitsFromBits(Context.getTargetInfo().getPointerWidth(0));
+ return Layout.getNonVirtualSize() == PointerSize ||
+ Layout.getNonVirtualSize() == PointerSize * 2;
+ }
+};
+}
+
+unsigned MicrosoftCXXABI::getMemberPointerSize(const MemberPointerType *MPT) const {
+ QualType Pointee = MPT->getPointeeType();
+ CXXRecordDecl *RD = MPT->getClass()->getAsCXXRecordDecl();
+ if (RD->getNumVBases() > 0) {
+ if (Pointee->isFunctionType())
+ return 3;
+ else
+ return 2;
+ } else if (RD->getNumBases() > 1 && Pointee->isFunctionType())
+ return 2;
+ return 1;
+}
+
+CXXABI *clang::CreateMicrosoftCXXABI(ASTContext &Ctx) {
+ return new MicrosoftCXXABI(Ctx);
+}
+