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1 | //===------- ItaniumCXXABI.cpp - AST support for the Itanium C++ ABI ------===// |
2 | // | |
3 | // The LLVM Compiler Infrastructure | |
4 | // | |
5 | // This file is distributed under the University of Illinois Open Source | |
6 | // License. See LICENSE.TXT for details. | |
7 | // | |
8 | //===----------------------------------------------------------------------===// | |
9 | // | |
10 | // This provides C++ AST support targeting the Itanium C++ ABI, which is | |
11 | // documented at: | |
12 | // http://www.codesourcery.com/public/cxx-abi/abi.html | |
13 | // http://www.codesourcery.com/public/cxx-abi/abi-eh.html | |
14 | // | |
15 | // It also supports the closely-related ARM C++ ABI, documented at: | |
16 | // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0041c/IHI0041C_cppabi.pdf | |
17 | // | |
18 | //===----------------------------------------------------------------------===// | |
19 | ||
20 | #include "CXXABI.h" | |
21 | #include "clang/AST/ASTContext.h" | |
22 | #include "clang/AST/RecordLayout.h" | |
23 | #include "clang/AST/DeclCXX.h" | |
24 | #include "clang/AST/Type.h" | |
25 | #include "clang/Basic/TargetInfo.h" | |
26 | ||
27 | using namespace clang; | |
28 | ||
29 | namespace { | |
30 | class ItaniumCXXABI : public CXXABI { | |
31 | protected: | |
32 | ASTContext &Context; | |
33 | public: | |
34 | ItaniumCXXABI(ASTContext &Ctx) : Context(Ctx) { } | |
35 | ||
36 | unsigned getMemberPointerSize(const MemberPointerType *MPT) const { | |
37 | QualType Pointee = MPT->getPointeeType(); | |
38 | if (Pointee->isFunctionType()) return 2; | |
39 | return 1; | |
40 | } | |
41 | ||
42 | CallingConv getDefaultMethodCallConv(bool isVariadic) const { | |
43 | return CC_C; | |
44 | } | |
45 | ||
46 | // We cheat and just check that the class has a vtable pointer, and that it's | |
47 | // only big enough to have a vtable pointer and nothing more (or less). | |
48 | bool isNearlyEmpty(const CXXRecordDecl *RD) const { | |
49 | ||
50 | // Check that the class has a vtable pointer. | |
51 | if (!RD->isDynamicClass()) | |
52 | return false; | |
53 | ||
54 | const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); | |
55 | CharUnits PointerSize = | |
56 | Context.toCharUnitsFromBits(Context.getTargetInfo().getPointerWidth(0)); | |
57 | return Layout.getNonVirtualSize() == PointerSize; | |
58 | } | |
59 | }; | |
60 | ||
61 | class ARMCXXABI : public ItaniumCXXABI { | |
62 | public: | |
63 | ARMCXXABI(ASTContext &Ctx) : ItaniumCXXABI(Ctx) { } | |
64 | }; | |
65 | } | |
66 | ||
67 | CXXABI *clang::CreateItaniumCXXABI(ASTContext &Ctx) { | |
68 | return new ItaniumCXXABI(Ctx); | |
69 | } | |
70 | ||
71 | CXXABI *clang::CreateARMCXXABI(ASTContext &Ctx) { | |
72 | return new ARMCXXABI(Ctx); | |
73 | } |