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annotate ir/irstruct.cpp @ 1231:212ec2d9d176

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Fixed some minitest regressions.
author Tomas Lindquist Olsen <tomas.l.olsen gmail.com>
date Thu, 16 Apr 2009 19:21:30 +0200
parents 79758fd2f48a
children f295e51d2dd0
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1 #include "gen/llvm.h"
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2
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3 #include "mtype.h"
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4 #include "aggregate.h"
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5 #include "declaration.h"
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6 #include "init.h"
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7
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5c17f81fc1c1 [svn r173] moved IR state previously stored in Type into IrType and a Type->IrType map; fixes #7
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8 #include "gen/irstate.h"
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9 #include "gen/tollvm.h"
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10 #include "gen/logger.h"
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11 #include "gen/llvmhelpers.h"
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12 #include "gen/utils.h"
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13
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14 #include "ir/irstruct.h"
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15 #include "ir/irtypeclass.h"
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16
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17 //////////////////////////////////////////////////////////////////////////////
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18
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19 IrStruct::IrStruct(AggregateDeclaration* aggr)
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20 : diCompositeType(NULL)
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21 {
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22 aggrdecl = aggr;
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23
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24 type = aggr->type;
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25
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26 packed = (type->ty == Tstruct)
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27 ? type->alignsize() == 1
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28 : false;
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29
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30 // above still need to be looked at
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31
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32 init = NULL;
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33 constInit = NULL;
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34
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35 vtbl = NULL;
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36 constVtbl = NULL;
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37 classInfo = NULL;
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38 constClassInfo = NULL;
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39
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40 classInterfacesArray = NULL;
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41 }
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42
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43 //////////////////////////////////////////////////////////////////////////////
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44
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45 LLGlobalVariable * IrStruct::getInitSymbol()
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46 {
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47 if (init)
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48 return init;
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49
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50 // create the initZ symbol
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51 std::string initname("_D");
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52 initname.append(aggrdecl->mangle());
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53 initname.append("6__initZ");
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54
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55 llvm::GlobalValue::LinkageTypes _linkage = DtoExternalLinkage(aggrdecl);
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56
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57 init = new llvm::GlobalVariable(
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58 type->irtype->getPA().get(), true, _linkage, NULL, initname, gIR->module);
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59
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60 return init;
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61 }
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62
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63 //////////////////////////////////////////////////////////////////////////////
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64
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65 llvm::Constant * IrStruct::getDefaultInit()
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66 {
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67 if (constInit)
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68 return constInit;
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69
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70 if (type->ty == Tstruct)
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71 {
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72 constInit = createStructDefaultInitializer();
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73 }
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74 else
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75 {
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76 constInit = createClassDefaultInitializer();
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77 }
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78
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79 return constInit;
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80 }
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81
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82 //////////////////////////////////////////////////////////////////////////////
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83 //////////////////////////////////////////////////////////////////////////////
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84 //////////////////////////////////////////////////////////////////////////////
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85
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86 // helper function that returns the static default initializer of a variable
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87 LLConstant* get_default_initializer(VarDeclaration* vd, Initializer* init)
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88 {
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89 if (init)
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90 {
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91 return DtoConstInitializer(init->loc, vd->type, init);
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92 }
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93 else if (vd->init)
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94 {
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95 return DtoConstInitializer(vd->init->loc, vd->type, vd->init);
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96 }
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97 else
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98 {
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99 return DtoConstExpInit(vd->loc, vd->type, vd->type->defaultInit(vd->loc));
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100 }
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101 }
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102
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103 // helper function that adds zero bytes to a vector of constants
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104 size_t add_zeros(std::vector<llvm::Constant*>& constants, size_t diff)
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105 {
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106 size_t n = constants.size();
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107 while (diff)
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108 {
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109 if (global.params.is64bit && diff % 8 == 0)
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110 {
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111 constants.push_back(llvm::Constant::getNullValue(llvm::Type::Int64Ty));
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112 diff -= 8;
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113 }
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114 else if (diff % 4 == 0)
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115 {
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116 constants.push_back(llvm::Constant::getNullValue(llvm::Type::Int32Ty));
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117 diff -= 4;
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118 }
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119 else if (diff % 2 == 0)
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120 {
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121 constants.push_back(llvm::Constant::getNullValue(llvm::Type::Int16Ty));
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122 diff -= 2;
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123 }
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124 else
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125 {
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126 constants.push_back(llvm::Constant::getNullValue(llvm::Type::Int8Ty));
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127 diff -= 1;
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128 }
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129 }
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130 return constants.size() - n;
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131 }
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132
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133 // Matches the way the type is built in IrTypeStruct
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134 // maybe look at unifying the interface.
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135
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136 LLConstant * IrStruct::createStructDefaultInitializer()
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137 {
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138 IF_LOG Logger::println("Building default initializer for %s", aggrdecl->toPrettyChars());
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139 LOG_SCOPE;
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140
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141 assert(type->ty == Tstruct && "cannot build struct default initializer for non struct type");
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142
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143 // start at offset zero
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144 size_t offset = 0;
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145
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146 // vector of constants
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147 std::vector<llvm::Constant*> constants;
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148
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149 // go through fields
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150 ArrayIter<VarDeclaration> it(aggrdecl->fields);
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151 for (; !it.done(); it.next())
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152 {
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153 VarDeclaration* vd = it.get();
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154
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155 if (vd->offset < offset)
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156 {
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157 IF_LOG Logger::println("skipping field: %s %s (+%u)", vd->type->toChars(), vd->toChars(), vd->offset);
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158 continue;
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159 }
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160
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161 IF_LOG Logger::println("using field: %s %s (+%u)", vd->type->toChars(), vd->toChars(), vd->offset);
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162
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163 // get next aligned offset for this field
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164 size_t alignedoffset = offset;
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165 if (!packed)
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166 {
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167 size_t alignsize = vd->type->alignsize();
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168 alignedoffset = (offset + alignsize - 1) & ~(alignsize - 1);
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169 }
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170
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171 // insert explicit padding?
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172 if (alignedoffset < vd->offset)
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173 {
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174 add_zeros(constants, vd->offset - alignedoffset);
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175 }
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176
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177 // add initializer
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178 constants.push_back(get_default_initializer(vd, NULL));
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179
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180 // advance offset to right past this field
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181 offset = vd->offset + vd->type->size();
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182 }
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183
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184 // tail padding?
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185 if (offset < aggrdecl->structsize)
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186 {
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187 add_zeros(constants, aggrdecl->structsize - offset);
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188 }
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189
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190 // build constant struct
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191 llvm::Constant* definit = llvm::ConstantStruct::get(constants, packed);
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192 IF_LOG Logger::cout() << "final default initializer: " << *definit << std::endl;
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193
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194 // sanity check
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195 if (definit->getType() != type->irtype->get())
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196 {
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197 assert(0 && "default initializer type does not match the default struct type");
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198 }
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199
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200 return definit;
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201 }
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202
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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 // yet another rewrite of the notorious StructInitializer.
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208
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209 // this time a bit more inspired by the DMD code.
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210
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211 LLConstant * IrStruct::createStructInitializer(StructInitializer * si)
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212 {
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213 IF_LOG Logger::println("Building StructInitializer of type %s", si->ad->toPrettyChars());
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214 LOG_SCOPE;
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215
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216 // sanity check
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217 assert(si->ad == aggrdecl && "struct type mismatch");
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218 assert(si->vars.dim == si->value.dim && "inconsistent StructInitializer");
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219
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220 // array of things to build
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221 typedef std::pair<VarDeclaration*, llvm::Constant*> VCPair;
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222 llvm::SmallVector<VCPair, 16> data(aggrdecl->fields.dim);
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223
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224 // start by creating a map from initializer indices to field indices.
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225 // I have no fucking clue why dmd represents it like this :/
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226 size_t n = si->vars.dim;
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227 LLSmallVector<int, 16> datamap(n, 0);
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228 for (size_t i = 0; i < n; i++)
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229 {
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230 for (size_t j = 0; 1; j++)
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231 {
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232 assert(j < aggrdecl->fields.dim);
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233 if (aggrdecl->fields.data[j] == si->vars.data[i])
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234 {
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235 datamap[i] = j;
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236 break;
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237 }
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238 }
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239 }
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240
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241 // fill in explicit initializers
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242 n = si->vars.dim;
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243 for (size_t i = 0; i < n; i++)
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244 {
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245 VarDeclaration* vd = (VarDeclaration*)si->vars.data[i];
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246 Initializer* ini = (Initializer*)si->value.data[i];
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247
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248 size_t idx = datamap[i];
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249
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250 if (data[idx].first != NULL)
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251 {
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252 Loc l = ini ? ini->loc : si->loc;
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253 error(l, "duplicate initialization of %s", vd->toChars());
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254 continue;
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255 }
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256
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257 data[idx].first = vd;
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258 data[idx].second = get_default_initializer(vd, ini);
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259 }
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260
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261 // build array of constants and try to fill in default initializers
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262 // where there is room.
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263 size_t offset = 0;
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264 std::vector<llvm::Constant*> constants;
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265 constants.reserve(16);
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266
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267 n = data.size();
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268 for (size_t i = 0; i < n; i++)
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269 {
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270 VarDeclaration* vd = data[i].first;
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271
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272 // explicitly initialized?
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273 if (vd != NULL)
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274 {
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275 // get next aligned offset for this field
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276 size_t alignedoffset = offset;
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277 if (!packed)
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278 {
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279 size_t alignsize = vd->type->alignsize();
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280 alignedoffset = (offset + alignsize - 1) & ~(alignsize - 1);
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281 }
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282
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283 // insert explicit padding?
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284 if (alignedoffset < vd->offset)
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285 {
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286 add_zeros(constants, vd->offset - alignedoffset);
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287 }
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288
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289 IF_LOG Logger::println("using field: %s", vd->toChars());
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290 constants.push_back(data[i].second);
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291 offset = vd->offset + vd->type->size();
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292 }
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293 // not explicit! try and fit in the default initialization instead
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294 // make sure we don't overlap with any following explicity initialized fields
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295 else
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296 {
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297 vd = (VarDeclaration*)aggrdecl->fields.data[i];
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298
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299 // check all the way that we don't overlap, slow but it works!
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300 for (size_t j = i+1; j <= n; j++)
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301 {
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302 if (j == n) // no overlap
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303 {
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304 IF_LOG Logger::println("using field default: %s", vd->toChars());
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305 constants.push_back(get_default_initializer(vd, NULL));
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306 offset = vd->offset + vd->type->size();
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307 break;
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308 }
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309
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310 VarDeclaration* vd2 = (VarDeclaration*)aggrdecl->fields.data[j];
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311
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312 size_t o2 = vd->offset + vd->type->size();
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313
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314 if (vd2->offset < o2 && data[i].first)
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315 break; // overlaps
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316 }
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317 }
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318 }
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319
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320 // tail padding?
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321 if (offset < aggrdecl->structsize)
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322 {
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323 add_zeros(constants, aggrdecl->structsize - offset);
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324 }
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325
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326 // stop if there were errors
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327 if (global.errors)
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328 {
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329 fatal();
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330 }
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331
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332 // build constant
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333 assert(!constants.empty());
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334 llvm::Constant* c = llvm::ConstantStruct::get(&constants[0], constants.size(), packed);
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335 IF_LOG Logger::cout() << "final struct initializer: " << *c << std::endl;
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336 return c;
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337 }
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338