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annotate gen/structs.cpp @ 1234:9201e0d41ee5

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Fixed forward referenced structs.
author Tomas Lindquist Olsen <tomas.l.olsen gmail.com>
date Thu, 16 Apr 2009 20:41:27 +0200
parents 212ec2d9d176
children 3ddec21fe2b6
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058d3925950e [svn r92] Fixed support for statically initialized unions. lots of bugfixes as cleanups too.
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1 #include <algorithm>
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2
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3 #include "gen/llvm.h"
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4
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5 #include "mtype.h"
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6 #include "aggregate.h"
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7 #include "init.h"
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8 #include "declaration.h"
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9
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10 #include "gen/irstate.h"
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11 #include "gen/tollvm.h"
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12 #include "gen/llvmhelpers.h"
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13 #include "gen/arrays.h"
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14 #include "gen/logger.h"
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15 #include "gen/structs.h"
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16 #include "gen/dvalue.h"
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17 #include "gen/functions.h"
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18 #include "gen/utils.h"
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19
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20 #include "ir/irstruct.h"
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21 #include "ir/irtypestruct.h"
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af7a6faf9406 Fix #153. Factor out common code in StructLiteralExp::to(Const)Elem.
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23 //////////////////////////////////////////////////////////////////////////////////////////
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24
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25 void DtoResolveStruct(StructDeclaration* sd)
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26 {
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27 // don't do anything if already been here
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28 if (sd->ir.resolved) return;
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29 // make sure above works :P
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30 sd->ir.resolved = true;
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31
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32 // log what we're doing
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33 Logger::println("Resolving struct type: %s (%s)", sd->toChars(), sd->locToChars());
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34 LOG_SCOPE;
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35
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36 // make sure type exists
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37 DtoType(sd->type);
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38
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39 // if it's a forward declaration, all bets are off. The type should be enough
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40 if (sd->sizeok != 1)
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41 return;
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42
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43 // create the IrStruct
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44 IrStruct* irstruct = new IrStruct(sd);
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45 sd->ir.irStruct = irstruct;
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46
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47 // emit the initZ symbol
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48 LLGlobalVariable* initZ = irstruct->getInitSymbol();
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49
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50 // perform definition
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51 if (mustDefineSymbol(sd))
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52 {
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53 // set initZ initializer
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54 initZ->setInitializer(irstruct->getDefaultInit());
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55 }
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56
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57 // emit members
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58 if (sd->members)
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59 {
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60 ArrayIter<Dsymbol> it(*sd->members);
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61 while (!it.done())
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62 {
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63 Dsymbol* member = it.get();
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64 if (member)
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65 member->codegen(Type::sir);
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66 it.next();
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67 }
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68 }
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70 // emit typeinfo
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71 DtoTypeInfoOf(sd->type);
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72 }
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73
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74 //////////////////////////////////////////////////////////////////////////////////////////
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75 //////////////////////////// D STRUCT UTILITIES ////////////////////////////////////
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76 //////////////////////////////////////////////////////////////////////////////////////////
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77
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78 LLValue* DtoStructEquals(TOK op, DValue* lhs, DValue* rhs)
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79 {
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80 Type* t = lhs->getType()->toBasetype();
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81 assert(t->ty == Tstruct);
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82
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83 // set predicate
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84 llvm::ICmpInst::Predicate cmpop;
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85 if (op == TOKequal || op == TOKidentity)
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86 cmpop = llvm::ICmpInst::ICMP_EQ;
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87 else
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88 cmpop = llvm::ICmpInst::ICMP_NE;
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89
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90 // call memcmp
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91 size_t sz = getTypePaddedSize(DtoType(t));
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92 LLValue* val = DtoMemCmp(lhs->getRVal(), rhs->getRVal(), DtoConstSize_t(sz));
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93 return gIR->ir->CreateICmp(cmpop, val, LLConstantInt::get(val->getType(), 0, false), "tmp");
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94 }
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95
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96 //////////////////////////////////////////////////////////////////////////////////////////
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97
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98 LLValue* DtoIndexStruct(LLValue* src, StructDeclaration* sd, VarDeclaration* vd)
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99 {
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100 Logger::println("indexing struct field %s:", vd->toPrettyChars());
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101 LOG_SCOPE;
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102
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103 DtoResolveStruct(sd);
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104
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105 // vd must be a field
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106 IrField* field = vd->ir.irField;
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107 assert(field);
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108
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109 // get the start pointer
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110 const LLType* st = getPtrToType(DtoType(sd->type));
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111
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112 // cast to the formal struct type
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113 src = DtoBitCast(src, st);
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114
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115 // gep to the index
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116 LLValue* val = DtoGEPi(src, 0, field->index);
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117
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118 // do we need to offset further? (union area)
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119 if (field->unionOffset)
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120 {
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121 // cast to void*
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122 val = DtoBitCast(val, getVoidPtrType());
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123 // offset
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124 val = DtoGEPi1(val, field->unionOffset);
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125 }
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126
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127 // cast it to the right type
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128 val = DtoBitCast(val, getPtrToType(DtoType(vd->type)));
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129
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130 if (Logger::enabled())
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131 Logger::cout() << "value: " << *val << '\n';
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132
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133 return val;
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134 }
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135
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136 //////////////////////////////////////////////////////////////////////////////////////////
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137
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138 // helper function that adds zero bytes to a vector of constants
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139 size_t add_zeros(std::vector<llvm::Value*>& values, size_t diff)
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140 {
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141 size_t n = values.size();
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142 bool is64 = global.params.is64bit;
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143 while (diff)
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144 {
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145 if (is64 && diff % 8 == 0)
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146 {
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147 values.push_back(llvm::Constant::getNullValue(llvm::Type::Int64Ty));
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148 diff -= 8;
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149 }
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150 else if (diff % 4 == 0)
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151 {
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152 values.push_back(llvm::Constant::getNullValue(llvm::Type::Int32Ty));
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153 diff -= 4;
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154 }
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155 else if (diff % 2 == 0)
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156 {
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157 values.push_back(llvm::Constant::getNullValue(llvm::Type::Int16Ty));
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158 diff -= 2;
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159 }
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160 else
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161 {
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162 values.push_back(llvm::Constant::getNullValue(llvm::Type::Int8Ty));
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163 diff -= 1;
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164 }
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165 }
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166 return values.size() - n;
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167 }
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168
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169 std::vector<llvm::Value*> DtoStructLiteralValues(const StructDeclaration* sd, const std::vector<llvm::Value*>& inits)
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170 {
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171 // get arrays
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172 size_t nvars = sd->fields.dim;
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173 VarDeclaration** vars = (VarDeclaration**)sd->fields.data;
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174
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175 assert(inits.size() == nvars);
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176
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177 // first locate all explicit initializers
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178 std::vector<VarDeclaration*> explicitInits;
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179 for (size_t i=0; i < nvars; i++)
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180 {
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181 if (inits[i])
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182 {
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183 explicitInits.push_back(vars[i]);
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184 }
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185 }
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186
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187 // vector of values to build aggregate from
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188 std::vector<llvm::Value*> values;
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189
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190 // offset trackers
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191 size_t lastoffset = 0;
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192 size_t lastsize = 0;
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193
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194 // index of next explicit init
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195 size_t exidx = 0;
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196 // number of explicit inits
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197 size_t nex = explicitInits.size();
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198
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199 // for through each field and build up the struct, padding with zeros
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200 size_t i;
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201 for (i=0; i<nvars; i++)
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202 {
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203 VarDeclaration* var = vars[i];
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204
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205 // get var info
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206 size_t os = var->offset;
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207 size_t sz = var->type->size();
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208
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209 // get next explicit
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210 VarDeclaration* nextVar = NULL;
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211 size_t nextOs = 0;
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212 if (exidx < nex)
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213 {
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214 nextVar = explicitInits[exidx];
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215 nextOs = nextVar->offset;
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216 }
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217 // none, rest is defaults
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218 else
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219 {
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220 break;
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221 }
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222
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223 // not explicit initializer, default initialize if there is room, otherwise skip
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224 if (!inits[i])
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225 {
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226 // default init if there is room
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227 // (past current offset) and (small enough to fit before next explicit)
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228 if ((os >= lastoffset + lastsize) && (os+sz <= nextOs))
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229 {
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230 // add any 0 padding needed before this field
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231 if (os > lastoffset + lastsize)
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232 {
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233 //printf("1added %lu zeros\n", os - lastoffset - lastsize);
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234 add_zeros(values, os - lastoffset - lastsize);
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235 }
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236
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237 // get field default init
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238 IrField* f = var->ir.irField;
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239 assert(f);
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240 values.push_back(f->getDefaultInit());
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241
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242 lastoffset = os;
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243 lastsize = sz;
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244 //printf("added default: %s : %lu (%lu)\n", var->toChars(), os, sz);
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245 }
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246 // skip
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247 continue;
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248 }
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249
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250 assert(nextVar == var);
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251
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252 // add any 0 padding needed before this field
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253 if (os > lastoffset + lastsize)
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254 {
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255 //printf("added %lu zeros\n", os - lastoffset - lastsize);
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256 add_zeros(values, os - lastoffset - lastsize);
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257 }
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258
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259 // add the expression value
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260 values.push_back(inits[i]);
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261
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262 // update offsets
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263 lastoffset = os;
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264 lastsize = sz;
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265
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266 // go to next explicit init
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267 exidx++;
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268
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269 //printf("added field: %s : %lu (%lu)\n", var->toChars(), os, sz);
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270 }
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271
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272 // fill out rest with default initializers
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273 const LLType* structtype = DtoType(sd->type);
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274 size_t structsize = getTypePaddedSize(structtype);
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275
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276 // FIXME: this could probably share some code with the above
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277 if (structsize > lastoffset+lastsize)
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278 {
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279 for (/*continue from first loop*/; i < nvars; i++)
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280 {
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281 VarDeclaration* var = vars[i];
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282
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283 // get var info
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284 size_t os = var->offset;
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285 size_t sz = var->type->size();
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286
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287 // skip?
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288 if (os < lastoffset + lastsize)
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289 continue;
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290
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291 // add any 0 padding needed before this field
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292 if (os > lastoffset + lastsize)
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293 {
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294 //printf("2added %lu zeros\n", os - lastoffset - lastsize);
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295 add_zeros(values, os - lastoffset - lastsize);
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296 }
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297
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298 // get field default init
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299 IrField* f = var->ir.irField;
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300 assert(f);
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301 values.push_back(f->getDefaultInit());
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302
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303 lastoffset = os;
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304 lastsize = sz;
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305 //printf("2added default: %s : %lu (%lu)\n", var->toChars(), os, sz);
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306 }
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307 }
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308
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309 // add any 0 padding needed at the end of the literal
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310 if (structsize > lastoffset+lastsize)
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311 {
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312 //printf("3added %lu zeros\n", structsize - lastoffset - lastsize);
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313 add_zeros(values, structsize - lastoffset - lastsize);
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314 }
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315
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316 return values;
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317 }