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annotate ir/irtypestruct.cpp @ 1245:465a77c904d4

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Fixed all issues preventing Tango 0.99.8 to compile with `sh build-tango.sh --verbose ldc'.
author Tomas Lindquist Olsen <tomas.l.olsen gmail.com>
date Fri, 17 Apr 2009 14:38:29 +0200
parents 9201e0d41ee5
children ec1d9dc1d32a
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1 #include "llvm/DerivedTypes.h"
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2
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3 #include "aggregate.h"
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4 #include "declaration.h"
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5 #include "mtype.h"
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6
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7 #include "gen/irstate.h"
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8 #include "gen/tollvm.h"
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9 #include "gen/logger.h"
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10 #include "gen/utils.h"
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11 #include "ir/irtypestruct.h"
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12
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13 //////////////////////////////////////////////////////////////////////////////
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14 //////////////////////////////////////////////////////////////////////////////
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15 //////////////////////////////////////////////////////////////////////////////
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16
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17 IrTypeAggr::IrTypeAggr(AggregateDeclaration * ad)
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18 : IrType(ad->type, llvm::OpaqueType::get()),
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19 aggr(ad)
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20 {
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21 }
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22
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23 //////////////////////////////////////////////////////////////////////////////
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24 //////////////////////////////////////////////////////////////////////////////
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25 //////////////////////////////////////////////////////////////////////////////
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26
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27 IrTypeStruct::IrTypeStruct(StructDeclaration * sd)
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28 : IrTypeAggr(sd),
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29 sd(sd),
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30 ts((TypeStruct*)sd->type)
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31 {
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32 }
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33
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34 //////////////////////////////////////////////////////////////////////////////
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35
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36 size_t add_zeros(std::vector<const llvm::Type*>& defaultTypes, size_t diff)
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37 {
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38 size_t n = defaultTypes.size();
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39 while (diff)
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40 {
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41 if (global.params.is64bit && diff % 8 == 0)
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42 {
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43 defaultTypes.push_back(llvm::Type::Int64Ty);
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44 diff -= 8;
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45 }
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46 else if (diff % 4 == 0)
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47 {
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48 defaultTypes.push_back(llvm::Type::Int32Ty);
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49 diff -= 4;
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50 }
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51 else if (diff % 2 == 0)
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52 {
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53 defaultTypes.push_back(llvm::Type::Int16Ty);
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54 diff -= 2;
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55 }
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56 else
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57 {
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58 defaultTypes.push_back(llvm::Type::Int8Ty);
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59 diff -= 1;
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60 }
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61 }
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62 return defaultTypes.size() - n;
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63 }
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64
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65 const llvm::Type* IrTypeStruct::buildType()
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66 {
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67 IF_LOG Logger::println("Building struct type %s @ %s", sd->toPrettyChars(), sd->locToChars());
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68 LOG_SCOPE;
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69
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70 // if it's a forward declaration, all bets are off, stick with the opaque
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71 if (sd->sizeok != 1)
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72 return pa.get();
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73
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74 // find the fields that contribute to the default initializer.
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75 // these will define the default type.
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76
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77 std::vector<const llvm::Type*> defaultTypes;
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78 defaultTypes.reserve(16);
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79
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80 size_t offset = 0;
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81 size_t field_index = 0;
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82
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83 bool packed = (sd->type->alignsize() == 1);
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84
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85 ArrayIter<VarDeclaration> it(sd->fields);
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86 for (; !it.done(); it.next())
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87 {
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88 VarDeclaration* vd = it.get();
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89 //Logger::println("vd: %s", vd->toPrettyChars());
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90
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91 //assert(vd->ir.irField == NULL && "struct inheritance is not allowed, how can this happen?");
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92
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93 // skip if offset moved backwards
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94 if (vd->offset < offset)
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95 {
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96 IF_LOG Logger::println("Skipping field %s %s (+%u) for default", vd->type->toChars(), vd->toChars(), vd->offset);
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97 if (vd->ir.irField == NULL)
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98 new IrField(vd, 0, vd->offset);
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99 continue;
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100 }
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101
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102 IF_LOG Logger::println("Adding default field %s %s (+%u)", vd->type->toChars(), vd->toChars(), vd->offset);
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103
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104 // get next aligned offset for this type
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105 size_t alignedoffset = offset;
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106 if (!packed)
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107 {
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108 size_t alignsize = vd->type->alignsize();
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109 alignedoffset = (offset + alignsize - 1) & ~(alignsize - 1);
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110 }
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111
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112 // insert explicit padding?
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113 if (alignedoffset < vd->offset)
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114 {
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115 field_index += add_zeros(defaultTypes, vd->offset - alignedoffset);
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116 }
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117
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118 // add default type
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119 defaultTypes.push_back(DtoType(vd->type));
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120
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121 // advance offset to right past this field
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122 offset = vd->offset + vd->type->size();
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123
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124 // give field index
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125 // the IrField creation doesn't really belong here, but it's a trivial operation
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126 // and it save yet another of these loops.
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127 IF_LOG Logger::println("Field index: %zu", field_index);
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128 if (vd->ir.irField == NULL)
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129 new IrField(vd, field_index);
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130 field_index++;
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131 }
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132
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133 // tail padding?
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134 if (offset < sd->structsize)
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135 {
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136 add_zeros(defaultTypes, sd->structsize - offset);
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137 }
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138
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139 // build the llvm type
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140 const llvm::Type* st = llvm::StructType::get(defaultTypes, packed);
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141
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142 // refine type
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143 llvm::cast<llvm::OpaqueType>(pa.get())->refineAbstractTypeTo(st);
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144
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145 // name types
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146 Type::sir->getState()->module->addTypeName(sd->toPrettyChars(), pa.get());
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147
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148 #if 0
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149 IF_LOG Logger::cout() << "final struct type: " << *pa.get() << std::endl;
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150 #endif
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151
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152 return pa.get();
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153 }
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154
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155 //////////////////////////////////////////////////////////////////////////////