diff options
Diffstat (limited to 'contrib/llvm/tools/clang/lib/AST/MicrosoftCXXABI.cpp')
-rw-r--r-- | contrib/llvm/tools/clang/lib/AST/MicrosoftCXXABI.cpp | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/contrib/llvm/tools/clang/lib/AST/MicrosoftCXXABI.cpp b/contrib/llvm/tools/clang/lib/AST/MicrosoftCXXABI.cpp new file mode 100644 index 0000000..f33d6fe --- /dev/null +++ b/contrib/llvm/tools/clang/lib/AST/MicrosoftCXXABI.cpp @@ -0,0 +1,71 @@ +//===------- 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); +} + |