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1 //===------- MicrosoftCXXABI.cpp - AST support for the Microsoft C++ ABI --===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This provides C++ AST support targeting the Microsoft Visual C++
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10 // ABI.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "CXXABI.h"
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15 #include "clang/AST/ASTContext.h"
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16 #include "clang/AST/Attr.h"
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17 #include "clang/AST/CXXInheritance.h"
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18 #include "clang/AST/DeclCXX.h"
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221
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19 #include "clang/AST/Mangle.h"
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150
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20 #include "clang/AST/MangleNumberingContext.h"
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21 #include "clang/AST/RecordLayout.h"
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22 #include "clang/AST/Type.h"
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23 #include "clang/Basic/TargetInfo.h"
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24
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25 using namespace clang;
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26
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27 namespace {
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28
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29 /// Numbers things which need to correspond across multiple TUs.
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30 /// Typically these are things like static locals, lambdas, or blocks.
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31 class MicrosoftNumberingContext : public MangleNumberingContext {
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32 llvm::DenseMap<const Type *, unsigned> ManglingNumbers;
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33 unsigned LambdaManglingNumber;
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34 unsigned StaticLocalNumber;
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35 unsigned StaticThreadlocalNumber;
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36
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37 public:
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38 MicrosoftNumberingContext()
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39 : MangleNumberingContext(), LambdaManglingNumber(0),
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40 StaticLocalNumber(0), StaticThreadlocalNumber(0) {}
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41
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42 unsigned getManglingNumber(const CXXMethodDecl *CallOperator) override {
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43 return ++LambdaManglingNumber;
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44 }
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45
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46 unsigned getManglingNumber(const BlockDecl *BD) override {
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47 const Type *Ty = nullptr;
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48 return ++ManglingNumbers[Ty];
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49 }
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50
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51 unsigned getStaticLocalNumber(const VarDecl *VD) override {
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52 if (VD->getTLSKind())
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53 return ++StaticThreadlocalNumber;
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54 return ++StaticLocalNumber;
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55 }
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56
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57 unsigned getManglingNumber(const VarDecl *VD,
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58 unsigned MSLocalManglingNumber) override {
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59 return MSLocalManglingNumber;
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60 }
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61
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62 unsigned getManglingNumber(const TagDecl *TD,
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63 unsigned MSLocalManglingNumber) override {
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64 return MSLocalManglingNumber;
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65 }
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66 };
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67
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221
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68 class MSHIPNumberingContext : public MicrosoftNumberingContext {
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69 std::unique_ptr<MangleNumberingContext> DeviceCtx;
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70
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71 public:
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72 MSHIPNumberingContext(MangleContext *DeviceMangler) {
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73 DeviceCtx = createItaniumNumberingContext(DeviceMangler);
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74 }
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75
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76 unsigned getDeviceManglingNumber(const CXXMethodDecl *CallOperator) override {
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77 return DeviceCtx->getManglingNumber(CallOperator);
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78 }
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79 };
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80
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150
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81 class MicrosoftCXXABI : public CXXABI {
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82 ASTContext &Context;
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83 llvm::SmallDenseMap<CXXRecordDecl *, CXXConstructorDecl *> RecordToCopyCtor;
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84
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85 llvm::SmallDenseMap<TagDecl *, DeclaratorDecl *>
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86 UnnamedTagDeclToDeclaratorDecl;
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87 llvm::SmallDenseMap<TagDecl *, TypedefNameDecl *>
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88 UnnamedTagDeclToTypedefNameDecl;
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89
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221
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90 // MangleContext for device numbering context, which is based on Itanium C++
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91 // ABI.
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92 std::unique_ptr<MangleContext> DeviceMangler;
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93
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150
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94 public:
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95 MicrosoftCXXABI(ASTContext &Ctx) : Context(Ctx) {
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96 if (Context.getLangOpts().CUDA && Context.getAuxTargetInfo()) {
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97 assert(Context.getTargetInfo().getCXXABI().isMicrosoft() &&
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98 Context.getAuxTargetInfo()->getCXXABI().isItaniumFamily() &&
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99 "Unexpected combination of C++ ABIs.");
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100 DeviceMangler.reset(
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101 Context.createMangleContext(Context.getAuxTargetInfo()));
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102 }
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103 }
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150
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104
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105 MemberPointerInfo
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106 getMemberPointerInfo(const MemberPointerType *MPT) const override;
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107
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108 CallingConv getDefaultMethodCallConv(bool isVariadic) const override {
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109 if (!isVariadic &&
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110 Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86)
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111 return CC_X86ThisCall;
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112 return Context.getTargetInfo().getDefaultCallingConv();
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113 }
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114
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115 bool isNearlyEmpty(const CXXRecordDecl *RD) const override {
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116 llvm_unreachable("unapplicable to the MS ABI");
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117 }
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118
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119 const CXXConstructorDecl *
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120 getCopyConstructorForExceptionObject(CXXRecordDecl *RD) override {
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121 return RecordToCopyCtor[RD];
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122 }
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123
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124 void
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125 addCopyConstructorForExceptionObject(CXXRecordDecl *RD,
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126 CXXConstructorDecl *CD) override {
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127 assert(CD != nullptr);
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128 assert(RecordToCopyCtor[RD] == nullptr || RecordToCopyCtor[RD] == CD);
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129 RecordToCopyCtor[RD] = CD;
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130 }
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131
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132 void addTypedefNameForUnnamedTagDecl(TagDecl *TD,
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133 TypedefNameDecl *DD) override {
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134 TD = TD->getCanonicalDecl();
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135 DD = DD->getCanonicalDecl();
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136 TypedefNameDecl *&I = UnnamedTagDeclToTypedefNameDecl[TD];
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137 if (!I)
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138 I = DD;
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139 }
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140
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141 TypedefNameDecl *getTypedefNameForUnnamedTagDecl(const TagDecl *TD) override {
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142 return UnnamedTagDeclToTypedefNameDecl.lookup(
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143 const_cast<TagDecl *>(TD->getCanonicalDecl()));
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144 }
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145
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146 void addDeclaratorForUnnamedTagDecl(TagDecl *TD,
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147 DeclaratorDecl *DD) override {
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148 TD = TD->getCanonicalDecl();
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149 DD = cast<DeclaratorDecl>(DD->getCanonicalDecl());
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150 DeclaratorDecl *&I = UnnamedTagDeclToDeclaratorDecl[TD];
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151 if (!I)
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152 I = DD;
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153 }
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154
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155 DeclaratorDecl *getDeclaratorForUnnamedTagDecl(const TagDecl *TD) override {
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156 return UnnamedTagDeclToDeclaratorDecl.lookup(
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157 const_cast<TagDecl *>(TD->getCanonicalDecl()));
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158 }
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159
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160 std::unique_ptr<MangleNumberingContext>
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161 createMangleNumberingContext() const override {
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221
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162 if (Context.getLangOpts().CUDA && Context.getAuxTargetInfo()) {
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163 assert(DeviceMangler && "Missing device mangler");
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164 return std::make_unique<MSHIPNumberingContext>(DeviceMangler.get());
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165 }
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150
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166 return std::make_unique<MicrosoftNumberingContext>();
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167 }
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168 };
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169 }
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170
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171 // getNumBases() seems to only give us the number of direct bases, and not the
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172 // total. This function tells us if we inherit from anybody that uses MI, or if
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173 // we have a non-primary base class, which uses the multiple inheritance model.
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174 static bool usesMultipleInheritanceModel(const CXXRecordDecl *RD) {
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175 while (RD->getNumBases() > 0) {
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176 if (RD->getNumBases() > 1)
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177 return true;
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178 assert(RD->getNumBases() == 1);
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179 const CXXRecordDecl *Base =
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180 RD->bases_begin()->getType()->getAsCXXRecordDecl();
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181 if (RD->isPolymorphic() && !Base->isPolymorphic())
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182 return true;
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183 RD = Base;
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184 }
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185 return false;
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186 }
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187
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188 MSInheritanceModel CXXRecordDecl::calculateInheritanceModel() const {
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189 if (!hasDefinition() || isParsingBaseSpecifiers())
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190 return MSInheritanceModel::Unspecified;
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191 if (getNumVBases() > 0)
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192 return MSInheritanceModel::Virtual;
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193 if (usesMultipleInheritanceModel(this))
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194 return MSInheritanceModel::Multiple;
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195 return MSInheritanceModel::Single;
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196 }
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197
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198 MSInheritanceModel CXXRecordDecl::getMSInheritanceModel() const {
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199 MSInheritanceAttr *IA = getAttr<MSInheritanceAttr>();
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200 assert(IA && "Expected MSInheritanceAttr on the CXXRecordDecl!");
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201 return IA->getInheritanceModel();
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202 }
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203
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204 bool CXXRecordDecl::nullFieldOffsetIsZero() const {
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205 return !inheritanceModelHasOnlyOneField(/*IsMemberFunction=*/false,
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206 getMSInheritanceModel()) ||
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207 (hasDefinition() && isPolymorphic());
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208 }
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209
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210 MSVtorDispMode CXXRecordDecl::getMSVtorDispMode() const {
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211 if (MSVtorDispAttr *VDA = getAttr<MSVtorDispAttr>())
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212 return VDA->getVtorDispMode();
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213 return getASTContext().getLangOpts().getVtorDispMode();
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214 }
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215
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216 // Returns the number of pointer and integer slots used to represent a member
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217 // pointer in the MS C++ ABI.
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218 //
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219 // Member function pointers have the following general form; however, fields
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220 // are dropped as permitted (under the MSVC interpretation) by the inheritance
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221 // model of the actual class.
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222 //
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223 // struct {
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224 // // A pointer to the member function to call. If the member function is
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225 // // virtual, this will be a thunk that forwards to the appropriate vftable
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226 // // slot.
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227 // void *FunctionPointerOrVirtualThunk;
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228 //
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229 // // An offset to add to the address of the vbtable pointer after
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230 // // (possibly) selecting the virtual base but before resolving and calling
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231 // // the function.
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232 // // Only needed if the class has any virtual bases or bases at a non-zero
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233 // // offset.
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234 // int NonVirtualBaseAdjustment;
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235 //
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236 // // The offset of the vb-table pointer within the object. Only needed for
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237 // // incomplete types.
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238 // int VBPtrOffset;
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239 //
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240 // // An offset within the vb-table that selects the virtual base containing
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241 // // the member. Loading from this offset produces a new offset that is
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242 // // added to the address of the vb-table pointer to produce the base.
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243 // int VirtualBaseAdjustmentOffset;
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244 // };
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245 static std::pair<unsigned, unsigned>
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246 getMSMemberPointerSlots(const MemberPointerType *MPT) {
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247 const CXXRecordDecl *RD = MPT->getMostRecentCXXRecordDecl();
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248 MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
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249 unsigned Ptrs = 0;
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250 unsigned Ints = 0;
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251 if (MPT->isMemberFunctionPointer())
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252 Ptrs = 1;
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253 else
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254 Ints = 1;
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255 if (inheritanceModelHasNVOffsetField(MPT->isMemberFunctionPointer(),
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256 Inheritance))
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257 Ints++;
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258 if (inheritanceModelHasVBPtrOffsetField(Inheritance))
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259 Ints++;
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260 if (inheritanceModelHasVBTableOffsetField(Inheritance))
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261 Ints++;
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262 return std::make_pair(Ptrs, Ints);
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263 }
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264
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265 CXXABI::MemberPointerInfo MicrosoftCXXABI::getMemberPointerInfo(
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266 const MemberPointerType *MPT) const {
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267 // The nominal struct is laid out with pointers followed by ints and aligned
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268 // to a pointer width if any are present and an int width otherwise.
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269 const TargetInfo &Target = Context.getTargetInfo();
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270 unsigned PtrSize = Target.getPointerWidth(0);
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271 unsigned IntSize = Target.getIntWidth();
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272
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273 unsigned Ptrs, Ints;
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274 std::tie(Ptrs, Ints) = getMSMemberPointerSlots(MPT);
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275 MemberPointerInfo MPI;
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276 MPI.HasPadding = false;
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277 MPI.Width = Ptrs * PtrSize + Ints * IntSize;
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278
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279 // When MSVC does x86_32 record layout, it aligns aggregate member pointers to
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280 // 8 bytes. However, __alignof usually returns 4 for data memptrs and 8 for
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281 // function memptrs.
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282 if (Ptrs + Ints > 1 && Target.getTriple().isArch32Bit())
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283 MPI.Align = 64;
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284 else if (Ptrs)
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285 MPI.Align = Target.getPointerAlign(0);
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286 else
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287 MPI.Align = Target.getIntAlign();
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288
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289 if (Target.getTriple().isArch64Bit()) {
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290 MPI.Width = llvm::alignTo(MPI.Width, MPI.Align);
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291 MPI.HasPadding = MPI.Width != (Ptrs * PtrSize + Ints * IntSize);
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292 }
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293 return MPI;
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294 }
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295
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296 CXXABI *clang::CreateMicrosoftCXXABI(ASTContext &Ctx) {
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297 return new MicrosoftCXXABI(Ctx);
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298 }
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