Mercurial > projects > ldc
annotate ir/irclass.cpp @ 1228:79758fd2f48a
Added Doxygen file.
Completely seperated type and symbol generation. Should fix a lot of bugs, but is not yet 100% complete.
author | Tomas Lindquist Olsen <tomas.l.olsen gmail.com> |
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date | Wed, 15 Apr 2009 20:06:25 +0200 |
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children | fafe7c8d6734 |
rev | line source |
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1228
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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 |
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15 #include "ir/irstruct.h" |
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16 #include "ir/irtypeclass.h" |
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17 |
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18 ////////////////////////////////////////////////////////////////////////////// |
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19 |
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20 extern LLConstant* get_default_initializer(VarDeclaration* vd, Initializer* init); |
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21 extern size_t add_zeros(std::vector<llvm::Constant*>& constants, size_t diff); |
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22 |
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23 extern LLConstant* DtoDefineClassInfo(ClassDeclaration* cd); |
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24 |
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25 ////////////////////////////////////////////////////////////////////////////// |
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26 |
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27 LLGlobalVariable * IrStruct::getVtblSymbol() |
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28 { |
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29 if (vtbl) |
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30 return vtbl; |
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31 |
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32 // create the initZ symbol |
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33 std::string initname("_D"); |
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34 initname.append(aggrdecl->mangle()); |
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35 initname.append("6__vtblZ"); |
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36 |
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37 llvm::GlobalValue::LinkageTypes _linkage = DtoExternalLinkage(aggrdecl); |
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38 |
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39 const LLType* vtblTy = type->irtype->isClass()->getVtbl(); |
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40 |
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41 vtbl = new llvm::GlobalVariable( |
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42 vtblTy, true, _linkage, NULL, initname, gIR->module); |
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43 |
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44 return vtbl; |
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45 } |
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46 |
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47 ////////////////////////////////////////////////////////////////////////////// |
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48 |
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49 LLGlobalVariable * IrStruct::getClassInfoSymbol() |
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50 { |
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51 if (classInfo) |
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52 return classInfo; |
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53 |
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54 // create the initZ symbol |
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55 std::string initname("_D"); |
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56 initname.append(aggrdecl->mangle()); |
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57 if (aggrdecl->isInterfaceDeclaration()) |
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58 initname.append("11__InterfaceZ"); |
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59 else |
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60 initname.append("7__ClassZ"); |
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61 |
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62 llvm::GlobalValue::LinkageTypes _linkage = DtoExternalLinkage(aggrdecl); |
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63 |
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64 ClassDeclaration* cinfo = ClassDeclaration::classinfo; |
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65 DtoType(cinfo->type); |
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66 IrTypeClass* tc = cinfo->type->irtype->isClass(); |
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67 assert(tc && "invalid ClassInfo type"); |
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68 |
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69 classInfo = new llvm::GlobalVariable( |
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70 tc->getPA().get(), true, _linkage, NULL, initname, gIR->module); |
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71 |
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72 return classInfo; |
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73 } |
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74 |
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75 ////////////////////////////////////////////////////////////////////////////// |
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76 |
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77 LLGlobalVariable * IrStruct::getInterfaceArraySymbol() |
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78 { |
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79 if (classInterfacesArray) |
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80 return classInterfacesArray; |
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81 |
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82 ClassDeclaration* cd = aggrdecl->isClassDeclaration(); |
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83 |
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84 assert(cd->vtblInterfaces && cd->vtblInterfaces->dim > 0 && |
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85 "should not create interface info array for class with no explicit " |
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86 "interface implementations") |
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87 |
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88 VarDeclarationIter idx(ClassDeclaration::classinfo->fields, 3); |
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89 const llvm::Type* InterfaceTy = DtoType(idx->type); |
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90 |
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91 // create Interface[N] |
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92 const llvm::ArrayType* array_type = llvm::ArrayType::get( |
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93 InterfaceTy, |
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94 cd->vtblInterfaces->dim); |
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95 |
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96 // put it in a global |
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97 std::string name("_D"); |
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98 name.append(cd->mangle()); |
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99 name.append("16__interfaceInfosZ"); |
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100 classInterfacesArray = new llvm::GlobalVariable(array_type, true, DtoLinkage(cd), NULL, name, classInfo); |
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101 |
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102 return classInterfacesArray; |
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103 } |
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104 |
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105 ////////////////////////////////////////////////////////////////////////////// |
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106 |
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107 LLConstant * IrStruct::getVtblInit() |
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108 { |
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109 if (constVtbl) |
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110 return constVtbl; |
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111 |
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112 IF_LOG Logger::println("Building vtbl initializer"); |
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113 LOG_SCOPE; |
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114 |
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115 ClassDeclaration* cd = aggrdecl->isClassDeclaration(); |
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116 assert(cd && "not class"); |
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117 |
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118 std::vector<llvm::Constant*> constants; |
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119 constants.reserve(cd->vtbl.dim); |
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120 |
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121 // start with the classinfo |
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122 llvm::Constant* c = getClassInfoSymbol(); |
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123 c = DtoBitCast(c, DtoType(ClassDeclaration::classinfo->type)); |
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124 constants.push_back(c); |
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125 |
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126 // add virtual function pointers |
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127 size_t n = cd->vtbl.dim; |
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128 for (size_t i = 1; i < n; i++) |
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129 { |
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130 Dsymbol* dsym = (Dsymbol*)cd->vtbl.data[i]; |
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131 assert(dsym && "null vtbl member"); |
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132 |
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133 FuncDeclaration* fd = dsym->isFuncDeclaration(); |
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134 assert(fd && "vtbl entry not a function"); |
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135 |
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136 if (fd->isAbstract() && !fd->fbody) |
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137 { |
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138 c = getNullValue(DtoType(fd->type->pointerTo())); |
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139 } |
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140 else |
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141 { |
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142 fd->codegen(Type::sir); |
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143 assert(fd->ir.irFunc && "invalid vtbl function"); |
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144 c = fd->ir.irFunc->func; |
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145 } |
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146 constants.push_back(c); |
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147 } |
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148 |
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149 // build the constant struct |
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150 constVtbl = llvm::ConstantStruct::get(constants, false); |
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151 |
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152 // sanity check |
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153 #if 0 |
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154 IF_LOG Logger::cout() << "constVtbl type: " << *constVtbl->getType() << std::endl; |
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155 IF_LOG Logger::cout() << "vtbl type: " << *type->irtype->isClass()->getVtbl() << std::endl; |
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156 #endif |
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157 |
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158 assert(constVtbl->getType() == type->irtype->isClass()->getVtbl() && |
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159 "vtbl initializer type mismatch"); |
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160 |
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161 return constVtbl; |
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162 } |
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163 |
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164 ////////////////////////////////////////////////////////////////////////////// |
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165 |
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166 LLConstant * IrStruct::getClassInfoInit() |
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167 { |
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168 if (constClassInfo) |
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169 return constClassInfo; |
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170 constClassInfo = DtoDefineClassInfo(aggrdecl->isClassDeclaration()); |
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171 return constClassInfo; |
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172 } |
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173 |
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174 ////////////////////////////////////////////////////////////////////////////// |
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175 |
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176 void IrStruct::addBaseClassInits( |
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177 std::vector<llvm::Constant*>& constants, |
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178 ClassDeclaration* base, |
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179 size_t& offset, |
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180 size_t& field_index) |
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181 { |
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182 if (base->baseClass) |
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183 { |
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184 addBaseClassInits(constants, base->baseClass, offset, field_index); |
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185 } |
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186 |
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187 ArrayIter<VarDeclaration> it(base->fields); |
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188 for (; !it.done(); it.next()) |
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189 { |
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190 VarDeclaration* vd = it.get(); |
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191 |
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192 // skip if offset moved backwards |
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193 if (vd->offset < offset) |
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194 { |
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195 IF_LOG Logger::println("Skipping field %s %s (+%u) for default", vd->type->toChars(), vd->toChars(), vd->offset); |
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196 continue; |
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197 } |
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198 |
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199 IF_LOG Logger::println("Adding default field %s %s (+%u)", vd->type->toChars(), vd->toChars(), vd->offset); |
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200 LOG_SCOPE; |
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201 |
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202 // get next aligned offset for this type |
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203 size_t alignsize = vd->type->alignsize(); |
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204 size_t alignedoffset = (offset + alignsize - 1) & ~(alignsize - 1); |
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205 |
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206 // insert explicit padding? |
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207 if (alignedoffset < vd->offset) |
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208 { |
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209 add_zeros(constants, vd->offset - alignedoffset); |
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210 } |
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211 |
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212 // add default type |
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213 constants.push_back(get_default_initializer(vd, vd->init)); |
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214 |
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215 // advance offset to right past this field |
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216 offset = vd->offset + vd->type->size(); |
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217 } |
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218 |
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219 // has interface vtbls? |
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220 if (base->vtblInterfaces) |
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221 { |
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222 // false when it's not okay to use functions from super classes |
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223 bool newinsts = (base == aggrdecl->isClassDeclaration()); |
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224 |
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225 ArrayIter<BaseClass> it2(*base->vtblInterfaces); |
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226 for (; !it2.done(); it2.next()) |
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227 { |
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228 BaseClass* b = it2.get(); |
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229 constants.push_back(getInterfaceVtbl(b, newinsts)); |
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230 offset += PTRSIZE; |
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231 } |
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232 } |
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233 |
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234 // tail padding? |
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235 if (offset < base->structsize) |
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236 { |
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237 add_zeros(constants, base->structsize - offset); |
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238 offset = base->structsize; |
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239 } |
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240 } |
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241 |
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242 ////////////////////////////////////////////////////////////////////////////// |
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243 |
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244 LLConstant * IrStruct::createClassDefaultInitializer() |
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245 { |
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246 ClassDeclaration* cd = aggrdecl->isClassDeclaration(); |
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247 assert(cd && "invalid class aggregate"); |
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248 |
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249 IF_LOG Logger::println("Building class default initializer %s @ %s", cd->toPrettyChars(), cd->locToChars()); |
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250 LOG_SCOPE; |
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251 IF_LOG Logger::println("Instance size: %u", cd->structsize); |
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252 |
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253 // find the fields that contribute to the default initializer. |
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254 // these will define the default type. |
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255 |
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256 std::vector<llvm::Constant*> constants; |
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257 constants.reserve(32); |
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258 |
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259 // add vtbl |
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260 constants.push_back(getVtblSymbol()); |
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261 // add monitor |
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262 constants.push_back(getNullValue(DtoType(Type::tvoid->pointerTo()))); |
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263 |
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264 // we start right after the vtbl and monitor |
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265 size_t offset = PTRSIZE * 2; |
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266 size_t field_index = 2; |
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267 |
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268 // add data members recursively |
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269 addBaseClassInits(constants, cd, offset, field_index); |
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270 |
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271 // build the constant |
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272 llvm::Constant* definit = llvm::ConstantStruct::get(constants, false); |
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273 |
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274 // sanity check |
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275 assert(definit->getType() == type->irtype->getPA().get() && "class initializer type mismatch"); |
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276 |
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277 return definit; |
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278 } |
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279 |
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280 ////////////////////////////////////////////////////////////////////////////// |
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281 |
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282 llvm::GlobalVariable * IrStruct::getInterfaceVtbl(BaseClass * b, bool new_instance) |
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283 { |
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284 ClassDeclaration* cd = aggrdecl->isClassDeclaration(); |
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285 assert(cd && "not a class aggregate"); |
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286 |
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287 ClassGlobalMap::iterator it = interfaceVtblMap.find(cd); |
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288 if (it != interfaceVtblMap.end()) |
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289 return it->second; |
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290 |
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291 IF_LOG Logger::println("Building vtbl for implementation of interface %s in class %s", |
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292 b->base->toPrettyChars(), aggrdecl->toPrettyChars()); |
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293 LOG_SCOPE; |
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294 |
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295 Array vtbl_array; |
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296 b->fillVtbl(cd, &vtbl_array, new_instance); |
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297 |
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298 std::vector<llvm::Constant*> constants; |
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299 constants.reserve(vtbl_array.dim); |
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300 |
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301 // start with the interface info |
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302 llvm::Constant* c = getNullValue(DtoType(Type::tvoid->pointerTo())); |
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303 constants.push_back(c); |
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304 |
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305 // add virtual function pointers |
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306 size_t n = vtbl_array.dim; |
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307 for (size_t i = 1; i < n; i++) |
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308 { |
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309 Dsymbol* dsym = (Dsymbol*)vtbl_array.data[i]; |
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310 assert(dsym && "null vtbl member"); |
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311 |
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312 FuncDeclaration* fd = dsym->isFuncDeclaration(); |
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313 assert(fd && "vtbl entry not a function"); |
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314 |
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315 assert(!(fd->isAbstract() && !fd->fbody) && |
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316 "null symbol in interface implementation vtable"); |
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317 |
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318 fd->codegen(Type::sir); |
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319 assert(fd->ir.irFunc && "invalid vtbl function"); |
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320 |
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321 constants.push_back(fd->ir.irFunc->func); |
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322 } |
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323 |
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324 // build the vtbl constant |
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325 llvm::Constant* vtbl_constant = llvm::ConstantStruct::get(constants, false); |
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326 |
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327 // create the global variable to hold it |
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328 llvm::GlobalValue::LinkageTypes _linkage = DtoExternalLinkage(aggrdecl); |
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329 |
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330 std::string mangle("_D"); |
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331 mangle.append(cd->mangle()); |
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332 mangle.append("11__interface"); |
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333 mangle.append(b->base->mangle()); |
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334 mangle.append("6__vtblZ"); |
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335 |
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336 llvm::GlobalVariable* GV = new llvm::GlobalVariable( |
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337 vtbl_constant->getType(), |
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338 true, |
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339 _linkage, |
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340 vtbl_constant, |
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341 mangle, |
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342 gIR->module |
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343 ); |
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344 |
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345 interfaceVtblMap.insert(std::make_pair(b->base, GV)); |
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346 |
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347 return GV; |
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348 } |
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349 |
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350 ////////////////////////////////////////////////////////////////////////////// |
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351 |
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352 LLConstant * IrStruct::getClassInfoInterfaces() |
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353 { |
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354 IF_LOG Logger::println("Building ClassInfo.interfaces"); |
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355 LOG_SCOPE; |
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356 |
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357 ClassDeclaration* cd = aggrdecl->isClassDeclaration(); |
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358 assert(cd); |
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359 |
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360 if (!cd->vtblInterfaces || cd->vtblInterfaces->dim == 0) |
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361 { |
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362 VarDeclarationIter idx(ClassDeclaration::classinfo->fields, 3); |
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363 return getNullValue(DtoType(idx->type)); |
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364 } |
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365 |
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366 // Build array of: |
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367 // |
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368 // struct Interface |
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369 // { |
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370 // ClassInfo classinfo; |
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371 // void*[] vtbl; |
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372 // ptrdiff_t offset; |
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373 // } |
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374 |
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375 LLSmallVector<LLConstant*, 6> constants; |
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376 constants.reserve(cd->vtblInterfaces->dim); |
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377 |
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378 const LLType* classinfo_type = DtoType(ClassDeclaration::classinfo->type); |
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379 const LLType* voidptrptr_type = DtoType( |
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380 Type::tvoid->pointerTo()->pointerTo()); |
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381 |
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382 const LLType* our_type = type->irtype->isClass()->getPA().get(); |
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383 |
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384 ArrayIter<BaseClass> it(*cd->vtblInterfaces); |
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385 while (it.more()) |
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386 { |
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387 IF_LOG Logger::println("Adding interface %s", it->base->toPrettyChars()); |
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388 |
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389 IrStruct* irinter = it->base->ir.irStruct; |
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390 assert(irinter && "interface has null IrStruct"); |
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391 IrTypeClass* itc = irinter->type->irtype->isClass(); |
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392 assert(itc && "null interface IrTypeClass"); |
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393 |
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394 // classinfo |
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395 LLConstant* ci = irinter->getClassInfoSymbol(); |
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396 ci = DtoBitCast(ci, classinfo_type); |
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397 |
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398 // vtbl |
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399 ClassGlobalMap::iterator itv = interfaceVtblMap.find(it->base); |
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400 assert(itv != interfaceVtblMap.end() && "interface vtbl not found"); |
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401 LLConstant* vtb = itv->second; |
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402 vtb = DtoBitCast(vtb, voidptrptr_type); |
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403 vtb = DtoConstSlice(DtoConstSize_t(itc->getVtblSize()), vtb); |
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404 |
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405 // offset |
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406 LLConstant* off = DtoConstSize_t(it->offset); |
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407 |
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408 // create Interface struct |
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409 LLConstant* inits[3] = { ci, vtb, off }; |
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410 LLConstant* entry = llvm::ConstantStruct::get(inits, 3); |
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411 constants.push_back(entry); |
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412 |
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413 // next |
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414 it.next(); |
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415 } |
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416 |
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417 // create Interface[N] |
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418 const llvm::ArrayType* array_type = llvm::ArrayType::get( |
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419 constants[0]->getType(), |
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420 cd->vtblInterfaces->dim); |
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421 |
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422 LLConstant* arr = llvm::ConstantArray::get( |
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423 array_type, |
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424 &constants[0], |
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425 constants.size()); |
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426 |
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427 // apply the initializer |
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428 classInterfacesArray->setInitializer(arr); |
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429 |
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430 LLConstant* idxs[2] = { |
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431 DtoConstSize_t(0), |
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432 DtoConstSize_t(0) |
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433 }; |
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434 |
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435 // return as a slice |
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436 return DtoConstSlice( |
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437 DtoConstSize_t(cd->vtblInterfaces->dim), |
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438 llvm::ConstantExpr::getGetElementPtr(classInterfacesArray, idxs, 2)); |
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439 } |
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440 |
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441 ////////////////////////////////////////////////////////////////////////////// |