1 //===--- MicrosoftCXXABI.cpp - Emit LLVM Code from ASTs for a Module ------===//
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++ code generation targeting the Microsoft Visual C++ ABI.
11 // The class in this file generates structures that follow the Microsoft
12 // Visual C++ ABI, which is actually not very well documented at all outside
13 // of Microsoft.
14 //
15 //===----------------------------------------------------------------------===//
16
17 #include "CGCXXABI.h"
18 #include "CodeGenModule.h"
19 #include "clang/AST/Decl.h"
20 #include "clang/AST/DeclCXX.h"
21
22 using namespace clang;
23 using namespace CodeGen;
24
25 namespace {
26
27 class MicrosoftCXXABI : public CGCXXABI {
28 public:
MicrosoftCXXABI(CodeGenModule & CGM)29 MicrosoftCXXABI(CodeGenModule &CGM) : CGCXXABI(CGM) {}
30
BuildConstructorSignature(const CXXConstructorDecl * Ctor,CXXCtorType Type,CanQualType & ResTy,llvm::SmallVectorImpl<CanQualType> & ArgTys)31 void BuildConstructorSignature(const CXXConstructorDecl *Ctor,
32 CXXCtorType Type,
33 CanQualType &ResTy,
34 llvm::SmallVectorImpl<CanQualType> &ArgTys) {
35 // 'this' is already in place
36 // TODO: 'for base' flag
37 }
38
BuildDestructorSignature(const CXXDestructorDecl * Ctor,CXXDtorType Type,CanQualType & ResTy,llvm::SmallVectorImpl<CanQualType> & ArgTys)39 void BuildDestructorSignature(const CXXDestructorDecl *Ctor,
40 CXXDtorType Type,
41 CanQualType &ResTy,
42 llvm::SmallVectorImpl<CanQualType> &ArgTys) {
43 // 'this' is already in place
44 // TODO: 'for base' flag
45 }
46
BuildInstanceFunctionParams(CodeGenFunction & CGF,QualType & ResTy,FunctionArgList & Params)47 void BuildInstanceFunctionParams(CodeGenFunction &CGF,
48 QualType &ResTy,
49 FunctionArgList &Params) {
50 BuildThisParam(CGF, Params);
51 // TODO: 'for base' flag
52 }
53
EmitInstanceFunctionProlog(CodeGenFunction & CGF)54 void EmitInstanceFunctionProlog(CodeGenFunction &CGF) {
55 EmitThisParam(CGF);
56 // TODO: 'for base' flag
57 }
58
59 // ==== Notes on array cookies =========
60 //
61 // MSVC seems to only use cookies when the class has a destructor; a
62 // two-argument usual array deallocation function isn't sufficient.
63 //
64 // For example, this code prints "100" and "1":
65 // struct A {
66 // char x;
67 // void *operator new[](size_t sz) {
68 // printf("%u\n", sz);
69 // return malloc(sz);
70 // }
71 // void operator delete[](void *p, size_t sz) {
72 // printf("%u\n", sz);
73 // free(p);
74 // }
75 // };
76 // int main() {
77 // A *p = new A[100];
78 // delete[] p;
79 // }
80 // Whereas it prints "104" and "104" if you give A a destructor.
81 };
82
83 }
84
CreateMicrosoftCXXABI(CodeGenModule & CGM)85 CGCXXABI *clang::CodeGen::CreateMicrosoftCXXABI(CodeGenModule &CGM) {
86 return new MicrosoftCXXABI(CGM);
87 }
88
89