Mercurial > projects > ldc
annotate ir/irclass.cpp @ 1508:e1e93343fc11
Move function codegen data from IrFunction to new FuncGen.
This change reduces memory consumption significantly by releasing the
memory held by the STL containers that are now inside FuncGen.
author | Christian Kamm <kamm incasoftware de> |
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date | Sat, 20 Jun 2009 19:11:44 +0200 |
parents | a5526b7a5ae6 |
children | ad7f2f1862d6 |
rev | line source |
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1 #include "llvm/Constants.h" |
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2 #include "llvm/DerivedTypes.h" |
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3 |
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4 #include "aggregate.h" |
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5 #include "declaration.h" |
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6 #include "mtype.h" |
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7 |
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8 #include "gen/irstate.h" |
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9 #include "gen/logger.h" |
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10 #include "gen/tollvm.h" |
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11 #include "gen/llvmhelpers.h" |
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12 #include "gen/utils.h" |
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13 #include "gen/arrays.h" |
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14 #include "gen/metadata.h" |
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15 |
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16 #include "ir/irstruct.h" |
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17 #include "ir/irtypeclass.h" |
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18 |
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19 ////////////////////////////////////////////////////////////////////////////// |
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20 |
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21 extern LLConstant* get_default_initializer(VarDeclaration* vd, Initializer* init); |
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22 extern size_t add_zeros(std::vector<llvm::Constant*>& constants, size_t diff); |
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23 |
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24 extern LLConstant* DtoDefineClassInfo(ClassDeclaration* cd); |
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25 |
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26 ////////////////////////////////////////////////////////////////////////////// |
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27 |
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28 LLGlobalVariable * IrStruct::getVtblSymbol() |
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29 { |
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30 if (vtbl) |
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31 return vtbl; |
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32 |
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33 // create the initZ symbol |
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34 std::string initname("_D"); |
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35 initname.append(aggrdecl->mangle()); |
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36 initname.append("6__vtblZ"); |
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37 |
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38 llvm::GlobalValue::LinkageTypes _linkage = DtoExternalLinkage(aggrdecl); |
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39 |
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40 const LLType* vtblTy = type->irtype->isClass()->getVtbl(); |
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41 |
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42 vtbl = new llvm::GlobalVariable( |
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43 vtblTy, true, _linkage, NULL, initname, gIR->module); |
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44 |
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45 return vtbl; |
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46 } |
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47 |
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48 ////////////////////////////////////////////////////////////////////////////// |
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49 |
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50 LLGlobalVariable * IrStruct::getClassInfoSymbol() |
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51 { |
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52 if (classInfo) |
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53 return classInfo; |
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54 |
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55 // create the initZ symbol |
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56 std::string initname("_D"); |
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57 initname.append(aggrdecl->mangle()); |
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58 if (aggrdecl->isInterfaceDeclaration()) |
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59 initname.append("11__InterfaceZ"); |
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60 else |
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61 initname.append("7__ClassZ"); |
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62 |
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63 llvm::GlobalValue::LinkageTypes _linkage = DtoExternalLinkage(aggrdecl); |
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64 |
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65 ClassDeclaration* cinfo = ClassDeclaration::classinfo; |
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66 DtoType(cinfo->type); |
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67 IrTypeClass* tc = cinfo->type->irtype->isClass(); |
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68 assert(tc && "invalid ClassInfo type"); |
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69 |
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70 // classinfos cannot be constants since they're used a locks for synchronized |
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71 classInfo = new llvm::GlobalVariable( |
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72 tc->getPA().get(), false, _linkage, NULL, initname, gIR->module); |
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73 |
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74 #ifdef USE_METADATA |
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75 // Generate some metadata on this ClassInfo if it's for a class. |
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76 |
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77 ClassDeclaration* classdecl = aggrdecl->isClassDeclaration(); |
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78 if (classdecl && !aggrdecl->isInterfaceDeclaration()) { |
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79 // Gather information |
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80 const LLType* type = DtoType(aggrdecl->type); |
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81 const LLType* bodyType = llvm::cast<LLPointerType>(type)->getElementType(); |
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82 bool hasDestructor = (classdecl->dtor != NULL); |
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83 bool hasCustomDelete = (classdecl->aggDelete != NULL); |
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84 // Construct the fields |
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85 MDNodeField* mdVals[CD_NumFields]; |
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86 mdVals[CD_BodyType] = llvm::UndefValue::get(bodyType); |
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87 mdVals[CD_Finalize] = LLConstantInt::get(LLType::Int1Ty, hasDestructor); |
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88 mdVals[CD_CustomDelete] = LLConstantInt::get(LLType::Int1Ty, hasCustomDelete); |
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89 // Construct the metadata |
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90 llvm::MDNode* metadata = llvm::MDNode::get(mdVals, CD_NumFields); |
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91 // Insert it into the module |
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92 new llvm::GlobalVariable(metadata->getType(), true, |
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93 METADATA_LINKAGE_TYPE, metadata, CD_PREFIX + initname, gIR->module); |
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94 } |
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95 #endif |
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96 |
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97 return classInfo; |
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98 } |
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99 |
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100 ////////////////////////////////////////////////////////////////////////////// |
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101 |
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102 LLGlobalVariable * IrStruct::getInterfaceArraySymbol() |
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103 { |
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104 if (classInterfacesArray) |
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105 return classInterfacesArray; |
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106 |
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107 ClassDeclaration* cd = aggrdecl->isClassDeclaration(); |
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108 |
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109 size_t n = type->irtype->isClass()->getNumInterfaceVtbls(); |
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110 assert(n > 0 && "getting ClassInfo.interfaces storage symbol, but we " |
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111 "don't implement any interfaces"); |
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112 |
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113 VarDeclarationIter idx(ClassDeclaration::classinfo->fields, 3); |
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114 const llvm::Type* InterfaceTy = DtoType(idx->type->nextOf()); |
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115 |
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116 // create Interface[N] |
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117 const llvm::ArrayType* array_type = llvm::ArrayType::get(InterfaceTy,n); |
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118 |
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119 // put it in a global |
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120 std::string name("_D"); |
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121 name.append(cd->mangle()); |
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122 name.append("16__interfaceInfosZ"); |
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123 |
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124 llvm::GlobalValue::LinkageTypes _linkage = DtoExternalLinkage(aggrdecl); |
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125 classInterfacesArray = new llvm::GlobalVariable(array_type, true, _linkage, NULL, name, classInfo); |
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126 |
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127 return classInterfacesArray; |
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128 } |
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129 |
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130 ////////////////////////////////////////////////////////////////////////////// |
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131 |
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132 LLConstant * IrStruct::getVtblInit() |
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133 { |
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134 if (constVtbl) |
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135 return constVtbl; |
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136 |
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137 IF_LOG Logger::println("Building vtbl initializer"); |
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138 LOG_SCOPE; |
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139 |
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140 ClassDeclaration* cd = aggrdecl->isClassDeclaration(); |
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141 assert(cd && "not class"); |
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142 |
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143 std::vector<llvm::Constant*> constants; |
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144 constants.reserve(cd->vtbl.dim); |
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145 |
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146 // start with the classinfo |
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147 llvm::Constant* c = getClassInfoSymbol(); |
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148 c = DtoBitCast(c, DtoType(ClassDeclaration::classinfo->type)); |
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149 constants.push_back(c); |
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150 |
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151 // add virtual function pointers |
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152 size_t n = cd->vtbl.dim; |
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153 for (size_t i = 1; i < n; i++) |
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154 { |
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155 Dsymbol* dsym = (Dsymbol*)cd->vtbl.data[i]; |
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156 assert(dsym && "null vtbl member"); |
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157 |
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158 FuncDeclaration* fd = dsym->isFuncDeclaration(); |
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159 assert(fd && "vtbl entry not a function"); |
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160 |
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161 if (fd->isAbstract() && !fd->fbody) |
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162 { |
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163 c = getNullValue(DtoType(fd->type->pointerTo())); |
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164 } |
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165 else |
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166 { |
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167 fd->codegen(Type::sir); |
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168 assert(fd->ir.irFunc && "invalid vtbl function"); |
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169 c = fd->ir.irFunc->func; |
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170 } |
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171 constants.push_back(c); |
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172 } |
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173 |
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174 // build the constant struct |
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175 constVtbl = llvm::ConstantStruct::get(constants, false); |
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176 |
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177 #if 0 |
1453 | 178 IF_LOG Logger::cout() << "constVtbl type: " << *constVtbl->getType() << std::endl; |
179 IF_LOG Logger::cout() << "vtbl type: " << *type->irtype->isClass()->getVtbl() << std::endl; | |
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180 #endif |
1463 | 181 |
182 #if 1 | |
183 | |
184 size_t nc = constants.size(); | |
185 const LLType* vtblTy = type->irtype->isClass()->getVtbl(); | |
186 for (size_t i = 0; i < nc; ++i) | |
187 { | |
188 if (constVtbl->getOperand(i)->getType() != vtblTy->getContainedType(i)) | |
189 { | |
190 Logger::cout() << "type mismatch for entry # " << i << " in vtbl initializer" << std::endl; | |
191 | |
192 constVtbl->getOperand(i)->dump(); | |
193 vtblTy->getContainedType(i)->dump(gIR->module); | |
194 } | |
195 } | |
196 | |
197 #endif | |
198 | |
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199 assert(constVtbl->getType() == type->irtype->isClass()->getVtbl() && |
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200 "vtbl initializer type mismatch"); |
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201 |
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202 return constVtbl; |
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203 } |
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204 |
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205 ////////////////////////////////////////////////////////////////////////////// |
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206 |
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207 LLConstant * IrStruct::getClassInfoInit() |
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208 { |
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209 if (constClassInfo) |
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210 return constClassInfo; |
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211 constClassInfo = DtoDefineClassInfo(aggrdecl->isClassDeclaration()); |
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212 return constClassInfo; |
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213 } |
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214 |
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215 ////////////////////////////////////////////////////////////////////////////// |
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216 |
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217 void IrStruct::addBaseClassInits( |
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218 std::vector<llvm::Constant*>& constants, |
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219 ClassDeclaration* base, |
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220 size_t& offset, |
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221 size_t& field_index) |
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222 { |
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223 if (base->baseClass) |
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224 { |
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225 addBaseClassInits(constants, base->baseClass, offset, field_index); |
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226 } |
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227 |
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228 IrTypeClass* tc = base->type->irtype->isClass(); |
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229 assert(tc); |
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230 |
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231 // go through fields |
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232 IrTypeAggr::iterator it; |
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233 for (it = tc->def_begin(); it != tc->def_end(); ++it) |
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234 { |
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235 VarDeclaration* vd = *it; |
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236 |
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237 IF_LOG Logger::println("Adding default field %s %s (+%u)", vd->type->toChars(), vd->toChars(), vd->offset); |
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238 LOG_SCOPE; |
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239 |
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240 assert(vd->offset >= offset && "default fields not sorted by offset"); |
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241 |
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242 // get next aligned offset for this type |
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Initial (but disabled) fix for ticket #294 , the actual part that fixes the bug is in a #if 0 block as I'm afraid it will cause regressions. I'm most likely not going to be around tonight, and maybe not tomorrow as well, so I'm pushing it in case someone wants to run some serious testing/investigate the problem noted in llvmhelpers.cpp : realignOffset .
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243 size_t alignedoffset = realignOffset(offset, vd->type); |
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244 |
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245 // insert explicit padding? |
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246 if (alignedoffset < vd->offset) |
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247 { |
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248 add_zeros(constants, vd->offset - alignedoffset); |
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249 } |
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250 |
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251 // add default type |
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252 constants.push_back(get_default_initializer(vd, vd->init)); |
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253 |
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254 // advance offset to right past this field |
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255 offset = vd->offset + vd->type->size(); |
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256 } |
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257 |
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258 // has interface vtbls? |
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259 if (base->vtblInterfaces && base->vtblInterfaces->dim > 0) |
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260 { |
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261 // false when it's not okay to use functions from super classes |
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262 bool newinsts = (base == aggrdecl->isClassDeclaration()); |
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263 |
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264 size_t inter_idx = interfacesWithVtbls.size(); |
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265 |
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266 offset = (offset + PTRSIZE - 1) & ~(PTRSIZE - 1); |
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267 |
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268 ArrayIter<BaseClass> it2(*base->vtblInterfaces); |
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269 for (; !it2.done(); it2.next()) |
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270 { |
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271 BaseClass* b = it2.get(); |
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272 constants.push_back(getInterfaceVtbl(b, newinsts, inter_idx)); |
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273 offset += PTRSIZE; |
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274 |
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275 // add to the interface list |
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276 interfacesWithVtbls.push_back(b); |
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277 inter_idx++; |
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278 } |
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279 } |
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280 |
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281 // tail padding? |
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282 if (offset < base->structsize) |
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283 { |
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284 add_zeros(constants, base->structsize - offset); |
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285 offset = base->structsize; |
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286 } |
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287 } |
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288 |
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289 ////////////////////////////////////////////////////////////////////////////// |
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290 |
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291 LLConstant * IrStruct::createClassDefaultInitializer() |
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292 { |
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293 ClassDeclaration* cd = aggrdecl->isClassDeclaration(); |
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294 assert(cd && "invalid class aggregate"); |
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295 |
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296 IF_LOG Logger::println("Building class default initializer %s @ %s", cd->toPrettyChars(), cd->loc.toChars()); |
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297 LOG_SCOPE; |
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298 IF_LOG Logger::println("Instance size: %u", cd->structsize); |
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299 |
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300 // find the fields that contribute to the default initializer. |
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301 // these will define the default type. |
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302 |
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303 std::vector<llvm::Constant*> constants; |
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304 constants.reserve(32); |
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305 |
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306 // add vtbl |
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307 constants.push_back(getVtblSymbol()); |
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308 // add monitor |
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309 constants.push_back(getNullValue(DtoType(Type::tvoid->pointerTo()))); |
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310 |
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311 // we start right after the vtbl and monitor |
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312 size_t offset = PTRSIZE * 2; |
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313 size_t field_index = 2; |
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314 |
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315 // add data members recursively |
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316 addBaseClassInits(constants, cd, offset, field_index); |
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317 |
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318 // build the constant |
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319 llvm::Constant* definit = llvm::ConstantStruct::get(constants, false); |
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320 |
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321 return definit; |
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322 } |
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323 |
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324 ////////////////////////////////////////////////////////////////////////////// |
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325 |
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326 llvm::GlobalVariable * IrStruct::getInterfaceVtbl(BaseClass * b, bool new_instance, size_t interfaces_index) |
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327 { |
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328 ClassGlobalMap::iterator it = interfaceVtblMap.find(b->base); |
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329 if (it != interfaceVtblMap.end()) |
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330 return it->second; |
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331 |
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332 IF_LOG Logger::println("Building vtbl for implementation of interface %s in class %s", |
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333 b->base->toPrettyChars(), aggrdecl->toPrettyChars()); |
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334 LOG_SCOPE; |
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335 |
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336 ClassDeclaration* cd = aggrdecl->isClassDeclaration(); |
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337 assert(cd && "not a class aggregate"); |
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338 |
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339 Array vtbl_array; |
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340 b->fillVtbl(cd, &vtbl_array, new_instance); |
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341 |
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342 std::vector<llvm::Constant*> constants; |
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343 constants.reserve(vtbl_array.dim); |
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344 |
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345 // start with the interface info |
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346 VarDeclarationIter interfaces_idx(ClassDeclaration::classinfo->fields, 3); |
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347 Type* first = interfaces_idx->type->nextOf()->pointerTo(); |
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348 |
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349 // index into the interfaces array |
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350 llvm::Constant* idxs[2] = { |
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351 DtoConstSize_t(0), |
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352 DtoConstSize_t(interfaces_index) |
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353 }; |
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354 |
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355 llvm::Constant* c = llvm::ConstantExpr::getGetElementPtr( |
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356 getInterfaceArraySymbol(), idxs, 2); |
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357 |
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358 constants.push_back(c); |
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359 |
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360 // add virtual function pointers |
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361 size_t n = vtbl_array.dim; |
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362 for (size_t i = 1; i < n; i++) |
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363 { |
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364 Dsymbol* dsym = (Dsymbol*)vtbl_array.data[i]; |
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365 if (dsym == NULL) |
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366 { |
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367 // FIXME |
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368 // why is this null? |
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369 // happens for mini/s.d |
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370 constants.push_back(getNullValue(getVoidPtrType())); |
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371 continue; |
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372 } |
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373 |
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374 FuncDeclaration* fd = dsym->isFuncDeclaration(); |
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375 assert(fd && "vtbl entry not a function"); |
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376 |
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377 assert((!fd->isAbstract() || fd->fbody) && |
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378 "null symbol in interface implementation vtable"); |
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379 |
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380 fd->codegen(Type::sir); |
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381 assert(fd->ir.irFunc && "invalid vtbl function"); |
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382 |
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383 constants.push_back(fd->ir.irFunc->func); |
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384 } |
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385 |
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386 // build the vtbl constant |
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387 llvm::Constant* vtbl_constant = llvm::ConstantStruct::get(constants, false); |
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388 |
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389 // create the global variable to hold it |
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390 llvm::GlobalValue::LinkageTypes _linkage = DtoExternalLinkage(aggrdecl); |
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391 |
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392 std::string mangle("_D"); |
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393 mangle.append(cd->mangle()); |
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394 mangle.append("11__interface"); |
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395 mangle.append(b->base->mangle()); |
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396 mangle.append("6__vtblZ"); |
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397 |
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398 llvm::GlobalVariable* GV = new llvm::GlobalVariable( |
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399 vtbl_constant->getType(), |
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400 true, |
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401 _linkage, |
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402 vtbl_constant, |
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403 mangle, |
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404 gIR->module |
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405 ); |
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406 |
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407 // insert into the vtbl map |
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408 interfaceVtblMap.insert(std::make_pair(b->base, GV)); |
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409 |
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410 return GV; |
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411 } |
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412 |
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413 ////////////////////////////////////////////////////////////////////////////// |
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414 |
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415 LLConstant * IrStruct::getClassInfoInterfaces() |
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416 { |
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417 IF_LOG Logger::println("Building ClassInfo.interfaces"); |
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418 LOG_SCOPE; |
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419 |
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420 ClassDeclaration* cd = aggrdecl->isClassDeclaration(); |
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421 assert(cd); |
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422 |
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423 size_t n = interfacesWithVtbls.size(); |
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424 assert(type->irtype->isClass()->getNumInterfaceVtbls() == n && |
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425 "inconsistent number of interface vtables in this class"); |
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426 |
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427 VarDeclarationIter interfaces_idx(ClassDeclaration::classinfo->fields, 3); |
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428 |
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429 if (n == 0) |
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430 return getNullValue(DtoType(interfaces_idx->type)); |
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431 |
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432 // Build array of: |
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433 // |
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434 // struct Interface |
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435 // { |
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436 // ClassInfo classinfo; |
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437 // void*[] vtbl; |
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438 // ptrdiff_t offset; |
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439 // } |
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440 |
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441 LLSmallVector<LLConstant*, 6> constants; |
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442 constants.reserve(cd->vtblInterfaces->dim); |
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443 |
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444 const LLType* classinfo_type = DtoType(ClassDeclaration::classinfo->type); |
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445 const LLType* voidptrptr_type = DtoType( |
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446 Type::tvoid->pointerTo()->pointerTo()); |
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447 |
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448 const LLType* our_type = type->irtype->isClass()->getPA().get(); |
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449 |
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450 for (size_t i = 0; i < n; ++i) |
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451 { |
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452 BaseClass* it = interfacesWithVtbls[i]; |
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453 |
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454 IF_LOG Logger::println("Adding interface %s", it->base->toPrettyChars()); |
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455 |
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456 IrStruct* irinter = it->base->ir.irStruct; |
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457 assert(irinter && "interface has null IrStruct"); |
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458 IrTypeClass* itc = irinter->type->irtype->isClass(); |
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459 assert(itc && "null interface IrTypeClass"); |
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460 |
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461 // classinfo |
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462 LLConstant* ci = irinter->getClassInfoSymbol(); |
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463 ci = DtoBitCast(ci, classinfo_type); |
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464 |
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465 // vtbl |
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466 LLConstant* vtb; |
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467 // interface get a null |
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468 if (cd->isInterfaceDeclaration()) |
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469 { |
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470 vtb = DtoConstSlice(DtoConstSize_t(0), getNullValue(voidptrptr_type)); |
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471 } |
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472 else |
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473 { |
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474 ClassGlobalMap::iterator itv = interfaceVtblMap.find(it->base); |
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475 assert(itv != interfaceVtblMap.end() && "interface vtbl not found"); |
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476 vtb = itv->second; |
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477 vtb = DtoBitCast(vtb, voidptrptr_type); |
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478 vtb = DtoConstSlice(DtoConstSize_t(itc->getVtblSize()), vtb); |
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479 } |
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480 |
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481 // offset |
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482 LLConstant* off = DtoConstSize_t(it->offset); |
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483 |
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484 // create Interface struct |
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485 LLConstant* inits[3] = { ci, vtb, off }; |
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486 LLConstant* entry = llvm::ConstantStruct::get(inits, 3); |
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487 constants.push_back(entry); |
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488 } |
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489 |
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490 // create Interface[N] |
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491 const llvm::ArrayType* array_type = llvm::ArrayType::get( |
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492 constants[0]->getType(), |
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493 n); |
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494 |
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495 LLConstant* arr = llvm::ConstantArray::get( |
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496 array_type, |
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497 &constants[0], |
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498 n); |
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499 |
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500 // apply the initializer |
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501 classInterfacesArray->setInitializer(arr); |
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502 |
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503 // return null, only baseclass provide interfaces |
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504 if (cd->vtblInterfaces->dim == 0) |
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505 { |
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506 return getNullValue(DtoType(interfaces_idx->type)); |
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507 } |
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508 |
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509 // only the interface explicitly implemented by this class |
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510 // (not super classes) should show in ClassInfo |
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511 LLConstant* idxs[2] = { |
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512 DtoConstSize_t(0), |
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513 DtoConstSize_t(n - cd->vtblInterfaces->dim) |
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514 }; |
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515 |
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516 LLConstant* ptr = llvm::ConstantExpr::getGetElementPtr( |
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517 classInterfacesArray, idxs, 2); |
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518 |
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519 // return as a slice |
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520 return DtoConstSlice( DtoConstSize_t(cd->vtblInterfaces->dim), ptr ); |
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521 } |
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522 |
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523 ////////////////////////////////////////////////////////////////////////////// |
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524 |
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525 void IrStruct::initializeInterface() |
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526 { |
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527 InterfaceDeclaration* base = aggrdecl->isInterfaceDeclaration(); |
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528 assert(base && "not interface"); |
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529 |
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530 // has interface vtbls? |
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531 if (!base->vtblInterfaces) |
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532 return; |
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533 |
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534 ArrayIter<BaseClass> it(*base->vtblInterfaces); |
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535 for (; !it.done(); it.next()) |
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536 { |
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537 // add to the interface list |
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538 interfacesWithVtbls.push_back(it.get()); |
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539 } |
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540 } |
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541 |
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542 ////////////////////////////////////////////////////////////////////////////// |