Mercurial > projects > ldc
annotate ir/irclass.cpp @ 1317:4099548c80e0
Allocate objects on the stack if they (a) don't have a destructor, and
(b) don't override the delete operator (on top of the regular conditions for
stack allocation that also apply to arrays, structs, etc.).
The "no destructor" clause is not strictly necessary, but calling them at the
right time would be tricky to say the least; it would involve, among other
things, "manually" inserting a try-finally block around anything that might
throw exceptions not caught in the current function.
Note: objects with custom new operators are automatically ignored because they
don't use the regular allocation runtime call, so there's no need to pay special
attention to them.
author | Frits van Bommel <fvbommel wxs.nl> |
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date | Sat, 09 May 2009 00:50:15 +0200 |
parents | 8fb39f7f1a7c |
children | c21a6654cce2 |
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 LLConstant* 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->next); |
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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 classInterfacesArray = new llvm::GlobalVariable(array_type, true, DtoLinkage(cd), NULL, name, classInfo); |
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124 |
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125 return classInterfacesArray; |
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126 } |
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127 |
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128 ////////////////////////////////////////////////////////////////////////////// |
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129 |
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130 LLConstant * IrStruct::getVtblInit() |
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131 { |
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132 if (constVtbl) |
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133 return constVtbl; |
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134 |
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135 IF_LOG Logger::println("Building vtbl initializer"); |
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136 LOG_SCOPE; |
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137 |
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138 ClassDeclaration* cd = aggrdecl->isClassDeclaration(); |
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139 assert(cd && "not class"); |
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140 |
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141 std::vector<llvm::Constant*> constants; |
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142 constants.reserve(cd->vtbl.dim); |
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143 |
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144 // start with the classinfo |
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145 llvm::Constant* c = getClassInfoSymbol(); |
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146 c = DtoBitCast(c, DtoType(ClassDeclaration::classinfo->type)); |
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147 constants.push_back(c); |
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148 |
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149 // add virtual function pointers |
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150 size_t n = cd->vtbl.dim; |
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151 for (size_t i = 1; i < n; i++) |
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152 { |
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153 Dsymbol* dsym = (Dsymbol*)cd->vtbl.data[i]; |
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154 assert(dsym && "null vtbl member"); |
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155 |
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156 FuncDeclaration* fd = dsym->isFuncDeclaration(); |
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157 assert(fd && "vtbl entry not a function"); |
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158 |
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159 if (fd->isAbstract() && !fd->fbody) |
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160 { |
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161 c = getNullValue(DtoType(fd->type->pointerTo())); |
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162 } |
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163 else |
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164 { |
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165 fd->codegen(Type::sir); |
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166 assert(fd->ir.irFunc && "invalid vtbl function"); |
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167 c = fd->ir.irFunc->func; |
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168 } |
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169 constants.push_back(c); |
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170 } |
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171 |
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172 // build the constant struct |
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173 constVtbl = llvm::ConstantStruct::get(constants, false); |
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174 |
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175 // sanity check |
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176 #if 0 |
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177 IF_LOG Logger::cout() << "constVtbl type: " << *constVtbl->getType() << std::endl; |
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178 IF_LOG Logger::cout() << "vtbl type: " << *type->irtype->isClass()->getVtbl() << std::endl; |
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179 #endif |
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180 |
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181 assert(constVtbl->getType() == type->irtype->isClass()->getVtbl() && |
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182 "vtbl initializer type mismatch"); |
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183 |
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184 return constVtbl; |
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185 } |
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186 |
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187 ////////////////////////////////////////////////////////////////////////////// |
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188 |
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189 LLConstant * IrStruct::getClassInfoInit() |
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190 { |
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191 if (constClassInfo) |
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192 return constClassInfo; |
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193 constClassInfo = DtoDefineClassInfo(aggrdecl->isClassDeclaration()); |
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194 return constClassInfo; |
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195 } |
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196 |
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197 ////////////////////////////////////////////////////////////////////////////// |
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198 |
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199 void IrStruct::addBaseClassInits( |
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200 std::vector<llvm::Constant*>& constants, |
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201 ClassDeclaration* base, |
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202 size_t& offset, |
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203 size_t& field_index) |
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204 { |
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205 if (base->baseClass) |
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206 { |
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207 addBaseClassInits(constants, base->baseClass, offset, field_index); |
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208 } |
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209 |
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210 IrTypeClass* tc = base->type->irtype->isClass(); |
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211 assert(tc); |
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212 |
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213 // go through fields |
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214 IrTypeAggr::iterator it; |
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215 for (it = tc->def_begin(); it != tc->def_end(); ++it) |
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216 { |
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217 VarDeclaration* vd = *it; |
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218 |
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219 IF_LOG Logger::println("Adding default field %s %s (+%u)", vd->type->toChars(), vd->toChars(), vd->offset); |
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220 LOG_SCOPE; |
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221 |
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222 assert(vd->offset >= offset && "default fields not sorted by offset"); |
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223 |
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224 // get next aligned offset for this type |
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225 size_t alignsize = vd->type->alignsize(); |
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226 size_t alignedoffset = (offset + alignsize - 1) & ~(alignsize - 1); |
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227 |
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228 // insert explicit padding? |
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229 if (alignedoffset < vd->offset) |
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230 { |
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231 add_zeros(constants, vd->offset - alignedoffset); |
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232 } |
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233 |
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234 // add default type |
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235 constants.push_back(get_default_initializer(vd, vd->init)); |
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236 |
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237 // advance offset to right past this field |
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238 offset = vd->offset + vd->type->size(); |
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239 } |
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240 |
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241 // has interface vtbls? |
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242 if (base->vtblInterfaces && base->vtblInterfaces->dim > 0) |
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243 { |
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244 // false when it's not okay to use functions from super classes |
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245 bool newinsts = (base == aggrdecl->isClassDeclaration()); |
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246 |
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247 size_t inter_idx = interfacesWithVtbls.size(); |
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248 |
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249 offset = (offset + PTRSIZE - 1) & ~(PTRSIZE - 1); |
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250 |
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251 ArrayIter<BaseClass> it2(*base->vtblInterfaces); |
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252 for (; !it2.done(); it2.next()) |
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253 { |
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254 BaseClass* b = it2.get(); |
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255 constants.push_back(getInterfaceVtbl(b, newinsts, inter_idx)); |
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256 offset += PTRSIZE; |
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257 |
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258 // add to the interface list |
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259 interfacesWithVtbls.push_back(b); |
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260 inter_idx++; |
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261 } |
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262 } |
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263 |
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264 // tail padding? |
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265 if (offset < base->structsize) |
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266 { |
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267 add_zeros(constants, base->structsize - offset); |
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268 offset = base->structsize; |
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269 } |
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270 } |
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271 |
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272 ////////////////////////////////////////////////////////////////////////////// |
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273 |
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274 LLConstant * IrStruct::createClassDefaultInitializer() |
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275 { |
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276 ClassDeclaration* cd = aggrdecl->isClassDeclaration(); |
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277 assert(cd && "invalid class aggregate"); |
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278 |
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279 IF_LOG Logger::println("Building class default initializer %s @ %s", cd->toPrettyChars(), cd->loc.toChars()); |
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280 LOG_SCOPE; |
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281 IF_LOG Logger::println("Instance size: %u", cd->structsize); |
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282 |
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283 // find the fields that contribute to the default initializer. |
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284 // these will define the default type. |
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285 |
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286 std::vector<llvm::Constant*> constants; |
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287 constants.reserve(32); |
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288 |
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289 // add vtbl |
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290 constants.push_back(getVtblSymbol()); |
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291 // add monitor |
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292 constants.push_back(getNullValue(DtoType(Type::tvoid->pointerTo()))); |
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293 |
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294 // we start right after the vtbl and monitor |
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295 size_t offset = PTRSIZE * 2; |
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296 size_t field_index = 2; |
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297 |
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298 // add data members recursively |
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299 addBaseClassInits(constants, cd, offset, field_index); |
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300 |
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301 // build the constant |
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302 llvm::Constant* definit = llvm::ConstantStruct::get(constants, false); |
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303 |
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304 return definit; |
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305 } |
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306 |
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307 ////////////////////////////////////////////////////////////////////////////// |
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308 |
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309 llvm::GlobalVariable * IrStruct::getInterfaceVtbl(BaseClass * b, bool new_instance, size_t interfaces_index) |
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310 { |
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311 ClassGlobalMap::iterator it = interfaceVtblMap.find(b->base); |
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312 if (it != interfaceVtblMap.end()) |
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313 return it->second; |
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314 |
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315 IF_LOG Logger::println("Building vtbl for implementation of interface %s in class %s", |
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316 b->base->toPrettyChars(), aggrdecl->toPrettyChars()); |
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317 LOG_SCOPE; |
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318 |
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319 ClassDeclaration* cd = aggrdecl->isClassDeclaration(); |
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320 assert(cd && "not a class aggregate"); |
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321 |
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322 Array vtbl_array; |
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323 b->fillVtbl(cd, &vtbl_array, new_instance); |
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324 |
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325 std::vector<llvm::Constant*> constants; |
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326 constants.reserve(vtbl_array.dim); |
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327 |
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328 // start with the interface info |
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329 VarDeclarationIter interfaces_idx(ClassDeclaration::classinfo->fields, 3); |
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330 Type* first = interfaces_idx->type->next->pointerTo(); |
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331 |
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332 // index into the interfaces array |
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333 llvm::Constant* idxs[2] = { |
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334 DtoConstSize_t(0), |
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335 DtoConstSize_t(interfaces_index) |
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336 }; |
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337 |
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338 llvm::Constant* c = llvm::ConstantExpr::getGetElementPtr( |
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339 getInterfaceArraySymbol(), idxs, 2); |
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340 |
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341 constants.push_back(c); |
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342 |
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343 // add virtual function pointers |
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344 size_t n = vtbl_array.dim; |
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345 for (size_t i = 1; i < n; i++) |
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346 { |
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347 Dsymbol* dsym = (Dsymbol*)vtbl_array.data[i]; |
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348 if (dsym == NULL) |
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349 { |
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350 // FIXME |
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351 // why is this null? |
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352 // happens for mini/s.d |
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353 constants.push_back(getNullValue(getVoidPtrType())); |
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354 continue; |
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355 } |
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356 |
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357 FuncDeclaration* fd = dsym->isFuncDeclaration(); |
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358 assert(fd && "vtbl entry not a function"); |
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359 |
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360 assert((!fd->isAbstract() || fd->fbody) && |
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361 "null symbol in interface implementation vtable"); |
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362 |
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363 fd->codegen(Type::sir); |
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364 assert(fd->ir.irFunc && "invalid vtbl function"); |
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365 |
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366 constants.push_back(fd->ir.irFunc->func); |
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367 } |
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368 |
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369 // build the vtbl constant |
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370 llvm::Constant* vtbl_constant = llvm::ConstantStruct::get(constants, false); |
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371 |
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372 // create the global variable to hold it |
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373 llvm::GlobalValue::LinkageTypes _linkage = DtoExternalLinkage(aggrdecl); |
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374 |
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375 std::string mangle("_D"); |
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376 mangle.append(cd->mangle()); |
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377 mangle.append("11__interface"); |
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378 mangle.append(b->base->mangle()); |
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379 mangle.append("6__vtblZ"); |
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380 |
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381 llvm::GlobalVariable* GV = new llvm::GlobalVariable( |
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382 vtbl_constant->getType(), |
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383 true, |
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384 _linkage, |
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385 vtbl_constant, |
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386 mangle, |
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387 gIR->module |
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388 ); |
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389 |
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390 // insert into the vtbl map |
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391 interfaceVtblMap.insert(std::make_pair(b->base, GV)); |
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392 |
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393 return GV; |
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394 } |
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395 |
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396 ////////////////////////////////////////////////////////////////////////////// |
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397 |
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398 LLConstant * IrStruct::getClassInfoInterfaces() |
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399 { |
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400 IF_LOG Logger::println("Building ClassInfo.interfaces"); |
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401 LOG_SCOPE; |
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402 |
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403 ClassDeclaration* cd = aggrdecl->isClassDeclaration(); |
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404 assert(cd); |
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405 |
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406 size_t n = interfacesWithVtbls.size(); |
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407 assert(type->irtype->isClass()->getNumInterfaceVtbls() == n && |
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408 "inconsistent number of interface vtables in this class"); |
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409 |
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410 VarDeclarationIter interfaces_idx(ClassDeclaration::classinfo->fields, 3); |
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411 |
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412 if (n == 0) |
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413 return getNullValue(DtoType(interfaces_idx->type)); |
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414 |
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415 // Build array of: |
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416 // |
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417 // struct Interface |
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418 // { |
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419 // ClassInfo classinfo; |
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420 // void*[] vtbl; |
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421 // ptrdiff_t offset; |
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422 // } |
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423 |
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424 LLSmallVector<LLConstant*, 6> constants; |
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425 constants.reserve(cd->vtblInterfaces->dim); |
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426 |
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427 const LLType* classinfo_type = DtoType(ClassDeclaration::classinfo->type); |
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428 const LLType* voidptrptr_type = DtoType( |
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429 Type::tvoid->pointerTo()->pointerTo()); |
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430 |
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431 const LLType* our_type = type->irtype->isClass()->getPA().get(); |
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432 |
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433 for (size_t i = 0; i < n; ++i) |
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434 { |
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435 BaseClass* it = interfacesWithVtbls[i]; |
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436 |
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437 IF_LOG Logger::println("Adding interface %s", it->base->toPrettyChars()); |
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438 |
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439 IrStruct* irinter = it->base->ir.irStruct; |
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440 assert(irinter && "interface has null IrStruct"); |
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441 IrTypeClass* itc = irinter->type->irtype->isClass(); |
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442 assert(itc && "null interface IrTypeClass"); |
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443 |
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444 // classinfo |
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445 LLConstant* ci = irinter->getClassInfoSymbol(); |
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446 ci = DtoBitCast(ci, classinfo_type); |
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447 |
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448 // vtbl |
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449 LLConstant* vtb; |
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450 // interface get a null |
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451 if (cd->isInterfaceDeclaration()) |
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452 { |
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453 vtb = DtoConstSlice(DtoConstSize_t(0), getNullValue(voidptrptr_type)); |
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454 } |
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455 else |
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456 { |
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457 ClassGlobalMap::iterator itv = interfaceVtblMap.find(it->base); |
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458 assert(itv != interfaceVtblMap.end() && "interface vtbl not found"); |
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459 vtb = itv->second; |
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460 vtb = DtoBitCast(vtb, voidptrptr_type); |
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461 vtb = DtoConstSlice(DtoConstSize_t(itc->getVtblSize()), vtb); |
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462 } |
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463 |
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464 // offset |
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465 LLConstant* off = DtoConstSize_t(it->offset); |
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466 |
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467 // create Interface struct |
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468 LLConstant* inits[3] = { ci, vtb, off }; |
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469 LLConstant* entry = llvm::ConstantStruct::get(inits, 3); |
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470 constants.push_back(entry); |
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471 } |
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472 |
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473 // create Interface[N] |
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474 const llvm::ArrayType* array_type = llvm::ArrayType::get( |
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475 constants[0]->getType(), |
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476 n); |
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477 |
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478 LLConstant* arr = llvm::ConstantArray::get( |
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479 array_type, |
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480 &constants[0], |
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481 n); |
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482 |
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483 // apply the initializer |
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484 classInterfacesArray->setInitializer(arr); |
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485 |
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486 // return null, only baseclass provide interfaces |
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487 if (cd->vtblInterfaces->dim == 0) |
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488 { |
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489 return getNullValue(DtoType(interfaces_idx->type)); |
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490 } |
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491 |
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492 // only the interface explicitly implemented by this class |
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493 // (not super classes) should show in ClassInfo |
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494 LLConstant* idxs[2] = { |
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495 DtoConstSize_t(0), |
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496 DtoConstSize_t(n - cd->vtblInterfaces->dim) |
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497 }; |
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498 |
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499 LLConstant* ptr = llvm::ConstantExpr::getGetElementPtr( |
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500 classInterfacesArray, idxs, 2); |
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501 |
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502 // return as a slice |
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503 return DtoConstSlice( DtoConstSize_t(cd->vtblInterfaces->dim), ptr ); |
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504 } |
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505 |
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506 ////////////////////////////////////////////////////////////////////////////// |
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507 |
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508 void IrStruct::initializeInterface() |
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509 { |
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510 InterfaceDeclaration* base = aggrdecl->isInterfaceDeclaration(); |
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511 assert(base && "not interface"); |
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512 |
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513 // has interface vtbls? |
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514 if (!base->vtblInterfaces) |
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515 return; |
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516 |
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517 ArrayIter<BaseClass> it(*base->vtblInterfaces); |
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518 for (; !it.done(); it.next()) |
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519 { |
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520 // add to the interface list |
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521 interfacesWithVtbls.push_back(it.get()); |
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522 } |
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523 } |
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524 |
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525 ////////////////////////////////////////////////////////////////////////////// |