Mercurial > projects > ldc
annotate dmd/struct.c @ 1135:8ebbad15fc99
Remove struct padding which was making this test fail on 64-bit systems.
author | Frits van Bommel <fvbommel wxs.nl> |
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date | Tue, 24 Mar 2009 03:14:22 +0100 |
parents | b30fe7e1dbb9 |
children | 1860414bf3b7 |
rev | line source |
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1103
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1 |
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2 // Compiler implementation of the D programming language |
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3 // Copyright (c) 1999-2009 by Digital Mars |
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4 // All Rights Reserved |
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5 // written by Walter Bright |
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6 // http://www.digitalmars.com |
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7 // License for redistribution is by either the Artistic License |
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8 // in artistic.txt, or the GNU General Public License in gnu.txt. |
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9 // See the included readme.txt for details. |
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10 |
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11 #include <stdio.h> |
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12 #include <assert.h> |
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13 |
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14 #include "root.h" |
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15 #include "aggregate.h" |
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16 #include "scope.h" |
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17 #include "mtype.h" |
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18 #include "declaration.h" |
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19 #include "module.h" |
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20 #include "id.h" |
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21 #include "statement.h" |
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22 |
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23 /********************************* AggregateDeclaration ****************************/ |
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24 |
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25 AggregateDeclaration::AggregateDeclaration(Loc loc, Identifier *id) |
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26 : ScopeDsymbol(id) |
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27 { |
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28 this->loc = loc; |
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29 |
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30 storage_class = 0; |
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31 protection = PROTpublic; |
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32 type = NULL; |
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33 handle = NULL; |
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34 structsize = 0; // size of struct |
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35 alignsize = 0; // size of struct for alignment purposes |
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36 structalign = 0; // struct member alignment in effect |
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37 hasUnions = 0; |
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38 sizeok = 0; // size not determined yet |
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39 isdeprecated = 0; |
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40 inv = NULL; |
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41 aggNew = NULL; |
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42 aggDelete = NULL; |
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43 |
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44 stag = NULL; |
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45 sinit = NULL; |
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46 scope = NULL; |
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47 #if V2 |
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48 dtor = NULL; |
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49 |
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50 ctor = NULL; |
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51 defaultCtor = NULL; |
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52 #endif |
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53 } |
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54 |
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55 enum PROT AggregateDeclaration::prot() |
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56 { |
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57 return protection; |
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58 } |
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59 |
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60 void AggregateDeclaration::semantic2(Scope *sc) |
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61 { |
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62 //printf("AggregateDeclaration::semantic2(%s)\n", toChars()); |
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63 if (scope) |
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64 { error("has forward references"); |
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65 return; |
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66 } |
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67 if (members) |
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68 { |
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69 sc = sc->push(this); |
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70 for (size_t i = 0; i < members->dim; i++) |
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71 { |
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72 Dsymbol *s = (Dsymbol *)members->data[i]; |
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73 s->semantic2(sc); |
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74 } |
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75 sc->pop(); |
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76 } |
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77 } |
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78 |
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79 void AggregateDeclaration::semantic3(Scope *sc) |
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80 { int i; |
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81 |
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82 //printf("AggregateDeclaration::semantic3(%s)\n", toChars()); |
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83 if (members) |
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84 { |
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85 sc = sc->push(this); |
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86 for (i = 0; i < members->dim; i++) |
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87 { |
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88 Dsymbol *s = (Dsymbol *)members->data[i]; |
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89 s->semantic3(sc); |
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90 } |
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91 sc->pop(); |
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92 } |
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93 } |
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94 |
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95 void AggregateDeclaration::inlineScan() |
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96 { int i; |
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97 |
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98 //printf("AggregateDeclaration::inlineScan(%s)\n", toChars()); |
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99 if (members) |
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100 { |
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101 for (i = 0; i < members->dim; i++) |
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102 { |
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103 Dsymbol *s = (Dsymbol *)members->data[i]; |
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104 //printf("inline scan aggregate symbol '%s'\n", s->toChars()); |
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105 s->inlineScan(); |
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106 } |
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107 } |
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108 } |
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109 |
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110 unsigned AggregateDeclaration::size(Loc loc) |
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111 { |
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112 //printf("AggregateDeclaration::size() = %d\n", structsize); |
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113 if (!members) |
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114 error(loc, "unknown size"); |
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115 if (sizeok != 1) |
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116 { error(loc, "no size yet for forward reference"); |
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117 //*(char*)0=0; |
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118 } |
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119 return structsize; |
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120 } |
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121 |
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122 Type *AggregateDeclaration::getType() |
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123 { |
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124 return type; |
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125 } |
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126 |
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127 int AggregateDeclaration::isDeprecated() |
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128 { |
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129 return isdeprecated; |
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130 } |
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131 |
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132 /**************************** |
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133 * Do byte or word alignment as necessary. |
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134 * Align sizes of 0, as we may not know array sizes yet. |
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135 */ |
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136 |
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137 void AggregateDeclaration::alignmember( |
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138 unsigned salign, // struct alignment that is in effect |
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139 unsigned size, // alignment requirement of field |
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140 unsigned *poffset) |
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141 { |
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142 //printf("salign = %d, size = %d, offset = %d\n",salign,size,offset); |
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143 if (salign > 1) |
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144 { |
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145 assert(size != 3); |
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146 int sa = size; |
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147 if (sa == 0 || salign < sa) |
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148 sa = salign; |
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149 *poffset = (*poffset + sa - 1) & ~(sa - 1); |
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150 } |
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151 //printf("result = %d\n",offset); |
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152 } |
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153 |
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154 |
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155 void AggregateDeclaration::addField(Scope *sc, VarDeclaration *v) |
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156 { |
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157 unsigned memsize; // size of member |
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158 unsigned memalignsize; // size of member for alignment purposes |
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159 unsigned xalign; // alignment boundaries |
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160 |
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161 //printf("AggregateDeclaration::addField('%s') %s\n", v->toChars(), toChars()); |
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162 |
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163 // Check for forward referenced types which will fail the size() call |
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164 Type *t = v->type->toBasetype(); |
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165 if (t->ty == Tstruct /*&& isStructDeclaration()*/) |
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166 { TypeStruct *ts = (TypeStruct *)t; |
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167 #if V2 |
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168 if (ts->sym == this) |
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169 { |
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170 error("cannot have field %s with same struct type", v->toChars()); |
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171 } |
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172 #endif |
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173 |
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174 if (ts->sym->sizeok != 1) |
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175 { |
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176 sizeok = 2; // cannot finish; flag as forward referenced |
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177 return; |
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178 } |
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179 } |
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180 if (t->ty == Tident) |
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181 { |
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182 sizeok = 2; // cannot finish; flag as forward referenced |
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183 return; |
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184 } |
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185 |
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186 memsize = v->type->size(loc); |
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187 memalignsize = v->type->alignsize(); |
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188 xalign = v->type->memalign(sc->structalign); |
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189 alignmember(xalign, memalignsize, &sc->offset); |
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190 v->offset = sc->offset; |
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191 sc->offset += memsize; |
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192 if (sc->offset > structsize) |
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193 structsize = sc->offset; |
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194 if (sc->structalign < memalignsize) |
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195 memalignsize = sc->structalign; |
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196 if (alignsize < memalignsize) |
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197 alignsize = memalignsize; |
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198 //printf("\talignsize = %d\n", alignsize); |
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199 |
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200 v->storage_class |= STCfield; |
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201 //printf(" addField '%s' to '%s' at offset %d, size = %d\n", v->toChars(), toChars(), v->offset, memsize); |
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202 fields.push(v); |
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203 } |
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204 |
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205 |
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206 /********************************* StructDeclaration ****************************/ |
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207 |
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208 StructDeclaration::StructDeclaration(Loc loc, Identifier *id) |
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209 : AggregateDeclaration(loc, id) |
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210 { |
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211 zeroInit = 0; // assume false until we do semantic processing |
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212 #if V2 |
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213 hasIdentityAssign = 0; |
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214 cpctor = NULL; |
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215 postblit = NULL; |
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216 #endif |
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217 |
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218 // For forward references |
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219 type = new TypeStruct(this); |
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220 } |
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221 |
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222 Dsymbol *StructDeclaration::syntaxCopy(Dsymbol *s) |
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223 { |
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224 StructDeclaration *sd; |
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225 |
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226 if (s) |
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227 sd = (StructDeclaration *)s; |
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228 else |
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229 sd = new StructDeclaration(loc, ident); |
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230 ScopeDsymbol::syntaxCopy(sd); |
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231 return sd; |
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232 } |
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233 |
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234 void StructDeclaration::semantic(Scope *sc) |
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235 { int i; |
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236 Scope *sc2; |
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237 |
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238 //printf("+StructDeclaration::semantic(this=%p, '%s')\n", this, toChars()); |
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239 |
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240 //static int count; if (++count == 20) *(char*)0=0; |
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241 |
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242 assert(type); |
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243 if (!members) // if forward reference |
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244 return; |
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245 |
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246 if (symtab) |
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247 { if (!scope) |
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248 return; // semantic() already completed |
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249 } |
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250 else |
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251 symtab = new DsymbolTable(); |
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252 |
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253 Scope *scx = NULL; |
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254 if (scope) |
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255 { sc = scope; |
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256 scx = scope; // save so we don't make redundant copies |
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257 scope = NULL; |
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258 } |
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259 |
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260 parent = sc->parent; |
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261 #if STRUCTTHISREF |
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262 handle = type; |
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263 #else |
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264 handle = type->pointerTo(); |
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265 #endif |
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266 structalign = sc->structalign; |
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267 protection = sc->protection; |
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268 if (sc->stc & STCdeprecated) |
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269 isdeprecated = 1; |
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270 assert(!isAnonymous()); |
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271 if (sc->stc & STCabstract) |
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272 error("structs, unions cannot be abstract"); |
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273 #if V2 |
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274 if (storage_class & STCinvariant) |
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275 type = type->invariantOf(); |
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276 else if (storage_class & STCconst) |
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277 type = type->constOf(); |
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278 #endif |
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279 |
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280 if (sizeok == 0) // if not already done the addMember step |
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281 { |
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282 for (i = 0; i < members->dim; i++) |
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283 { |
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284 Dsymbol *s = (Dsymbol *)members->data[i]; |
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285 //printf("adding member '%s' to '%s'\n", s->toChars(), this->toChars()); |
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286 s->addMember(sc, this, 1); |
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287 } |
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288 } |
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289 |
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290 sizeok = 0; |
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291 sc2 = sc->push(this); |
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292 sc2->stc = 0; |
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293 sc2->parent = this; |
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294 if (isUnionDeclaration()) |
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295 sc2->inunion = 1; |
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296 sc2->protection = PROTpublic; |
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297 sc2->explicitProtection = 0; |
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298 |
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299 int members_dim = members->dim; |
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300 for (i = 0; i < members_dim; i++) |
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301 { |
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302 Dsymbol *s = (Dsymbol *)members->data[i]; |
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303 s->semantic(sc2); |
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304 if (isUnionDeclaration()) |
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305 sc2->offset = 0; |
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306 #if 0 |
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307 if (sizeok == 2) |
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308 { //printf("forward reference\n"); |
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309 break; |
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310 } |
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311 #endif |
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312 } |
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313 |
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314 /* The TypeInfo_Struct is expecting an opEquals and opCmp with |
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315 * a parameter that is a pointer to the struct. But if there |
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316 * isn't one, but is an opEquals or opCmp with a value, write |
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317 * another that is a shell around the value: |
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318 * int opCmp(struct *p) { return opCmp(*p); } |
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319 */ |
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320 |
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321 TypeFunction *tfeqptr; |
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322 { |
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323 Arguments *arguments = new Arguments; |
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324 Argument *arg = new Argument(STCin, handle, Id::p, NULL); |
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325 |
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326 arguments->push(arg); |
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327 tfeqptr = new TypeFunction(arguments, Type::tint32, 0, LINKd); |
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328 tfeqptr = (TypeFunction *)tfeqptr->semantic(0, sc); |
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329 } |
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330 |
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331 TypeFunction *tfeq; |
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332 { |
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333 Arguments *arguments = new Arguments; |
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334 Argument *arg = new Argument(STCin, type, NULL, NULL); |
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335 |
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336 arguments->push(arg); |
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337 tfeq = new TypeFunction(arguments, Type::tint32, 0, LINKd); |
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338 tfeq = (TypeFunction *)tfeq->semantic(0, sc); |
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339 } |
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340 |
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341 Identifier *id = Id::eq; |
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342 for (int i = 0; i < 2; i++) |
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343 { |
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344 Dsymbol *s = search_function(this, id); |
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345 FuncDeclaration *fdx = s ? s->isFuncDeclaration() : NULL; |
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346 if (fdx) |
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347 { FuncDeclaration *fd = fdx->overloadExactMatch(tfeqptr); |
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348 if (!fd) |
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349 { fd = fdx->overloadExactMatch(tfeq); |
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350 if (fd) |
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351 { // Create the thunk, fdptr |
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352 FuncDeclaration *fdptr = new FuncDeclaration(loc, loc, fdx->ident, STCundefined, tfeqptr); |
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353 Expression *e = new IdentifierExp(loc, Id::p); |
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354 e = new PtrExp(loc, e); |
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355 Expressions *args = new Expressions(); |
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356 args->push(e); |
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357 e = new IdentifierExp(loc, id); |
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358 e = new CallExp(loc, e, args); |
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359 fdptr->fbody = new ReturnStatement(loc, e); |
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360 ScopeDsymbol *s = fdx->parent->isScopeDsymbol(); |
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361 assert(s); |
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362 s->members->push(fdptr); |
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363 fdptr->addMember(sc, s, 1); |
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364 fdptr->semantic(sc2); |
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365 } |
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366 } |
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367 } |
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368 |
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369 id = Id::cmp; |
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370 } |
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371 #if V2 |
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372 dtor = buildDtor(sc2); |
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373 postblit = buildPostBlit(sc2); |
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374 cpctor = buildCpCtor(sc2); |
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375 buildOpAssign(sc2); |
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376 #endif |
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377 |
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378 sc2->pop(); |
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379 |
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380 if (sizeok == 2) |
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381 { // semantic() failed because of forward references. |
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382 // Unwind what we did, and defer it for later |
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383 fields.setDim(0); |
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384 structsize = 0; |
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385 alignsize = 0; |
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386 structalign = 0; |
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387 |
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388 scope = scx ? scx : new Scope(*sc); |
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389 scope->setNoFree(); |
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390 scope->module->addDeferredSemantic(this); |
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391 //printf("\tdeferring %s\n", toChars()); |
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392 return; |
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393 } |
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394 |
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395 // 0 sized struct's are set to 1 byte |
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396 if (structsize == 0) |
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397 { |
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398 structsize = 1; |
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399 alignsize = 1; |
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400 } |
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401 |
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402 // Round struct size up to next alignsize boundary. |
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403 // This will ensure that arrays of structs will get their internals |
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404 // aligned properly. |
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405 structsize = (structsize + alignsize - 1) & ~(alignsize - 1); |
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406 |
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407 sizeok = 1; |
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408 Module::dprogress++; |
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409 |
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410 //printf("-StructDeclaration::semantic(this=%p, '%s')\n", this, toChars()); |
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411 |
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412 // Determine if struct is all zeros or not |
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413 zeroInit = 1; |
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414 for (i = 0; i < fields.dim; i++) |
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415 { |
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416 Dsymbol *s = (Dsymbol *)fields.data[i]; |
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417 VarDeclaration *vd = s->isVarDeclaration(); |
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418 if (vd && !vd->isDataseg()) |
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419 { |
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420 if (vd->init) |
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421 { |
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422 // Should examine init to see if it is really all 0's |
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423 zeroInit = 0; |
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424 break; |
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425 } |
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426 else |
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427 { |
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428 if (!vd->type->isZeroInit()) |
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429 { |
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430 zeroInit = 0; |
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431 break; |
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432 } |
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433 } |
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434 } |
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435 } |
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436 |
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437 /* Look for special member functions. |
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438 */ |
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439 #if V2 |
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440 ctor = (CtorDeclaration *)search(0, Id::ctor, 0); |
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441 #endif |
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442 inv = (InvariantDeclaration *)search(0, Id::classInvariant, 0); |
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443 aggNew = (NewDeclaration *)search(0, Id::classNew, 0); |
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444 aggDelete = (DeleteDeclaration *)search(0, Id::classDelete, 0); |
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445 |
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446 if (sc->func) |
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447 { |
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448 semantic2(sc); |
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449 semantic3(sc); |
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450 } |
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451 } |
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452 |
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453 void StructDeclaration::toCBuffer(OutBuffer *buf, HdrGenState *hgs) |
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454 { int i; |
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455 |
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456 buf->printf("%s ", kind()); |
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457 if (!isAnonymous()) |
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458 buf->writestring(toChars()); |
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459 if (!members) |
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460 { |
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461 buf->writeByte(';'); |
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462 buf->writenl(); |
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463 return; |
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464 } |
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465 buf->writenl(); |
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466 buf->writeByte('{'); |
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467 buf->writenl(); |
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468 for (i = 0; i < members->dim; i++) |
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469 { |
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470 Dsymbol *s = (Dsymbol *)members->data[i]; |
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471 |
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472 buf->writestring(" "); |
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473 s->toCBuffer(buf, hgs); |
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474 } |
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475 buf->writeByte('}'); |
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476 buf->writenl(); |
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477 } |
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478 |
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479 |
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480 const char *StructDeclaration::kind() |
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481 { |
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482 return "struct"; |
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483 } |
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484 |
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485 /********************************* UnionDeclaration ****************************/ |
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486 |
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487 UnionDeclaration::UnionDeclaration(Loc loc, Identifier *id) |
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488 : StructDeclaration(loc, id) |
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489 { |
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490 } |
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491 |
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492 Dsymbol *UnionDeclaration::syntaxCopy(Dsymbol *s) |
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493 { |
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494 UnionDeclaration *ud; |
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495 |
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496 if (s) |
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497 ud = (UnionDeclaration *)s; |
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498 else |
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499 ud = new UnionDeclaration(loc, ident); |
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500 StructDeclaration::syntaxCopy(ud); |
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501 return ud; |
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502 } |
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503 |
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504 |
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505 const char *UnionDeclaration::kind() |
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506 { |
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507 return "union"; |
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508 } |
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509 |
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510 |