Mercurial > projects > ldc
annotate dmd2/clone.c @ 1054:a3d7288c4473
Future-proof the code to classify static array members of structs.
I made sure to create a merge conflict with the code attached to ticket #229
(which comments this code out due to changes in the DMD 'Type' type hierarchy)
so that if it gets committed as-is there will be a human looking at it.
author | Frits van Bommel <fvbommel wxs.nl> |
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date | Sun, 08 Mar 2009 01:26:30 +0100 |
parents | 356e65836fb5 |
children | 638d16625da2 |
rev | line source |
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758
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1 |
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2 // Compiler implementation of the D programming language |
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3 // Copyright (c) 1999-2008 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 "expression.h" |
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22 #include "statement.h" |
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23 #include "init.h" |
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24 |
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25 |
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26 /******************************************* |
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27 * We need an opAssign for the struct if |
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28 * it has a destructor or a postblit. |
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29 * We need to generate one if a user-specified one does not exist. |
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30 */ |
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31 |
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32 int StructDeclaration::needOpAssign() |
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33 { |
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34 #define X 0 |
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35 if (X) printf("StructDeclaration::needOpAssign() %s\n", toChars()); |
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36 if (hasIdentityAssign) |
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37 goto Ldontneed; |
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38 |
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39 if (dtor || postblit) |
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40 goto Lneed; |
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41 |
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42 /* If any of the fields need an opAssign, then we |
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43 * need it too. |
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44 */ |
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45 for (size_t i = 0; i < fields.dim; i++) |
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46 { |
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47 Dsymbol *s = (Dsymbol *)fields.data[i]; |
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48 VarDeclaration *v = s->isVarDeclaration(); |
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49 assert(v && v->storage_class & STCfield); |
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50 Type *tv = v->type->toBasetype(); |
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51 while (tv->ty == Tsarray) |
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52 { TypeSArray *ta = (TypeSArray *)tv; |
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53 tv = tv->nextOf()->toBasetype(); |
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54 } |
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55 if (tv->ty == Tstruct) |
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56 { TypeStruct *ts = (TypeStruct *)tv; |
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57 StructDeclaration *sd = ts->sym; |
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58 if (sd->needOpAssign()) |
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59 goto Lneed; |
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60 } |
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61 } |
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62 Ldontneed: |
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63 if (X) printf("\tdontneed\n"); |
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64 return 0; |
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65 |
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66 Lneed: |
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67 if (X) printf("\tneed\n"); |
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68 return 1; |
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69 #undef X |
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70 } |
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71 |
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72 /****************************************** |
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73 * Build opAssign for struct. |
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74 * S* opAssign(S s) { ... } |
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75 */ |
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76 |
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77 FuncDeclaration *StructDeclaration::buildOpAssign(Scope *sc) |
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78 { |
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79 if (!needOpAssign()) |
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80 return NULL; |
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81 |
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82 //printf("StructDeclaration::buildOpAssign() %s\n", toChars()); |
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83 |
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84 FuncDeclaration *fop = NULL; |
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85 |
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86 Argument *param = new Argument(STCnodtor, type, Id::p, NULL); |
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87 Arguments *fparams = new Arguments; |
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88 fparams->push(param); |
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89 Type *ftype = new TypeFunction(fparams, handle, FALSE, LINKd); |
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90 #if STRUCTTHISREF |
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91 ((TypeFunction *)ftype)->isref = 1; |
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92 #endif |
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93 |
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94 fop = new FuncDeclaration(0, 0, Id::assign, STCundefined, ftype); |
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95 |
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96 Expression *e = NULL; |
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97 if (postblit) |
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98 { /* Swap: |
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99 * tmp = *this; *this = s; tmp.dtor(); |
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100 */ |
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101 //printf("\tswap copy\n"); |
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102 Identifier *idtmp = Lexer::uniqueId("__tmp"); |
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103 VarDeclaration *tmp; |
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104 AssignExp *ec = NULL; |
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105 if (dtor) |
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106 { |
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107 tmp = new VarDeclaration(0, type, idtmp, new VoidInitializer(0)); |
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108 tmp->noauto = 1; |
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109 e = new DeclarationExp(0, tmp); |
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110 ec = new AssignExp(0, |
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111 new VarExp(0, tmp), |
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112 #if STRUCTTHISREF |
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113 new ThisExp(0) |
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114 #else |
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115 new PtrExp(0, new ThisExp(0)) |
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116 #endif |
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117 ); |
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118 ec->op = TOKblit; |
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119 e = Expression::combine(e, ec); |
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120 } |
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121 ec = new AssignExp(0, |
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122 #if STRUCTTHISREF |
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123 new ThisExp(0), |
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124 #else |
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125 new PtrExp(0, new ThisExp(0)), |
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126 #endif |
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127 new IdentifierExp(0, Id::p)); |
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128 ec->op = TOKblit; |
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129 e = Expression::combine(e, ec); |
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130 if (dtor) |
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131 { |
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132 /* Instead of running the destructor on s, run it |
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133 * on tmp. This avoids needing to copy tmp back in to s. |
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134 */ |
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135 Expression *ec = new DotVarExp(0, new VarExp(0, tmp), dtor, 0); |
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136 ec = new CallExp(0, ec); |
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137 e = Expression::combine(e, ec); |
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138 } |
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139 } |
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140 else |
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141 { /* Do memberwise copy |
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142 */ |
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143 //printf("\tmemberwise copy\n"); |
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144 for (size_t i = 0; i < fields.dim; i++) |
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145 { |
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146 Dsymbol *s = (Dsymbol *)fields.data[i]; |
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147 VarDeclaration *v = s->isVarDeclaration(); |
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148 assert(v && v->storage_class & STCfield); |
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149 // this.v = s.v; |
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150 AssignExp *ec = new AssignExp(0, |
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151 new DotVarExp(0, new ThisExp(0), v, 0), |
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152 new DotVarExp(0, new IdentifierExp(0, Id::p), v, 0)); |
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153 ec->op = TOKblit; |
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154 e = Expression::combine(e, ec); |
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155 } |
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156 } |
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157 Statement *s1 = new ExpStatement(0, e); |
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158 |
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159 /* Add: |
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160 * return this; |
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161 */ |
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162 e = new ThisExp(0); |
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163 Statement *s2 = new ReturnStatement(0, e); |
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164 |
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165 fop->fbody = new CompoundStatement(0, s1, s2); |
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166 |
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167 members->push(fop); |
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168 fop->addMember(sc, this, 1); |
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169 |
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170 sc = sc->push(); |
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171 sc->stc = 0; |
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172 sc->linkage = LINKd; |
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173 |
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174 fop->semantic(sc); |
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175 |
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176 sc->pop(); |
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177 |
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178 //printf("-StructDeclaration::buildOpAssign() %s\n", toChars()); |
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179 |
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180 return fop; |
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181 } |
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182 |
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183 /******************************************* |
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184 * Build copy constructor for struct. |
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185 * Copy constructors are compiler generated only, and are only |
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186 * callable from the compiler. They are not user accessible. |
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187 * A copy constructor is: |
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188 * void cpctpr(ref S s) |
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189 * { |
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190 * *this = s; |
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191 * this.postBlit(); |
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192 * } |
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193 * This is done so: |
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194 * - postBlit() never sees uninitialized data |
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195 * - memcpy can be much more efficient than memberwise copy |
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196 * - no fields are overlooked |
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197 */ |
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198 |
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199 FuncDeclaration *StructDeclaration::buildCpCtor(Scope *sc) |
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200 { |
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201 //printf("StructDeclaration::buildCpCtor() %s\n", toChars()); |
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202 FuncDeclaration *fcp = NULL; |
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203 |
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204 /* Copy constructor is only necessary if there is a postblit function, |
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205 * otherwise the code generator will just do a bit copy. |
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206 */ |
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207 if (postblit) |
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208 { |
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209 //printf("generating cpctor\n"); |
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210 |
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211 Argument *param = new Argument(STCref, type, Id::p, NULL); |
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212 Arguments *fparams = new Arguments; |
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213 fparams->push(param); |
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214 Type *ftype = new TypeFunction(fparams, Type::tvoid, FALSE, LINKd); |
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215 |
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216 fcp = new FuncDeclaration(0, 0, Id::cpctor, STCundefined, ftype); |
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217 |
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218 // Build *this = p; |
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219 Expression *e = new ThisExp(0); |
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220 #if !STRUCTTHISREF |
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221 e = new PtrExp(0, e); |
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222 #endif |
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223 AssignExp *ea = new AssignExp(0, e, new IdentifierExp(0, Id::p)); |
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224 ea->op = TOKblit; |
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225 Statement *s = new ExpStatement(0, ea); |
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226 |
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227 // Build postBlit(); |
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228 e = new VarExp(0, postblit, 0); |
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229 e = new CallExp(0, e); |
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230 |
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231 s = new CompoundStatement(0, s, new ExpStatement(0, e)); |
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232 fcp->fbody = s; |
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233 |
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234 members->push(fcp); |
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235 |
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236 sc = sc->push(); |
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237 sc->stc = 0; |
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238 sc->linkage = LINKd; |
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239 |
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240 fcp->semantic(sc); |
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241 |
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242 sc->pop(); |
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243 } |
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244 |
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245 return fcp; |
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246 } |
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247 |
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248 /***************************************** |
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249 * Create inclusive postblit for struct by aggregating |
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250 * all the postblits in postblits[] with the postblits for |
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251 * all the members. |
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252 * Note the close similarity with AggregateDeclaration::buildDtor(), |
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253 * and the ordering changes (runs forward instead of backwards). |
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254 */ |
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255 |
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256 #if DMDV2 |
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257 FuncDeclaration *StructDeclaration::buildPostBlit(Scope *sc) |
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258 { |
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259 //printf("StructDeclaration::buildPostBlit() %s\n", toChars()); |
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260 Expression *e = NULL; |
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261 |
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262 for (size_t i = 0; i < fields.dim; i++) |
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263 { |
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264 Dsymbol *s = (Dsymbol *)fields.data[i]; |
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265 VarDeclaration *v = s->isVarDeclaration(); |
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266 assert(v && v->storage_class & STCfield); |
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267 Type *tv = v->type->toBasetype(); |
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268 size_t dim = 1; |
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269 while (tv->ty == Tsarray) |
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270 { TypeSArray *ta = (TypeSArray *)tv; |
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271 dim *= ((TypeSArray *)tv)->dim->toInteger(); |
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272 tv = tv->nextOf()->toBasetype(); |
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273 } |
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274 if (tv->ty == Tstruct) |
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275 { TypeStruct *ts = (TypeStruct *)tv; |
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276 StructDeclaration *sd = ts->sym; |
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277 if (sd->postblit) |
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278 { Expression *ex; |
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279 |
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280 // this.v |
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281 ex = new ThisExp(0); |
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282 ex = new DotVarExp(0, ex, v, 0); |
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283 |
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284 if (dim == 1) |
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285 { // this.v.dtor() |
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286 ex = new DotVarExp(0, ex, sd->postblit, 0); |
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287 ex = new CallExp(0, ex); |
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288 } |
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289 else |
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290 { |
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291 // Typeinfo.postblit(cast(void*)&this.v); |
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292 Expression *ea = new AddrExp(0, ex); |
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293 ea = new CastExp(0, ea, Type::tvoid->pointerTo()); |
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294 |
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295 Expression *et = v->type->getTypeInfo(sc); |
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296 et = new DotIdExp(0, et, Id::postblit); |
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297 |
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298 ex = new CallExp(0, et, ea); |
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299 } |
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300 e = Expression::combine(e, ex); // combine in forward order |
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301 } |
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302 } |
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303 } |
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304 |
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305 /* Build our own "postblit" which executes e |
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306 */ |
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307 if (e) |
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308 { //printf("Building __fieldPostBlit()\n"); |
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309 PostBlitDeclaration *dd = new PostBlitDeclaration(0, 0, Lexer::idPool("__fieldPostBlit")); |
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310 dd->fbody = new ExpStatement(0, e); |
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311 dtors.push(dd); |
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312 members->push(dd); |
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313 dd->semantic(sc); |
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314 } |
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315 |
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316 switch (postblits.dim) |
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317 { |
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318 case 0: |
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319 return NULL; |
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320 |
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321 case 1: |
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322 return (FuncDeclaration *)postblits.data[0]; |
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323 |
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324 default: |
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325 e = NULL; |
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326 for (size_t i = 0; i < postblits.dim; i++) |
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327 { FuncDeclaration *fd = (FuncDeclaration *)postblits.data[i]; |
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328 Expression *ex = new ThisExp(0); |
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329 ex = new DotVarExp(0, ex, fd, 0); |
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330 ex = new CallExp(0, ex); |
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331 e = Expression::combine(e, ex); |
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332 } |
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333 PostBlitDeclaration *dd = new PostBlitDeclaration(0, 0, Lexer::idPool("__aggrPostBlit")); |
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334 dd->fbody = new ExpStatement(0, e); |
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335 members->push(dd); |
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336 dd->semantic(sc); |
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337 return dd; |
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338 } |
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339 } |
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340 |
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341 #endif |
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342 |
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343 /***************************************** |
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344 * Create inclusive destructor for struct/class by aggregating |
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345 * all the destructors in dtors[] with the destructors for |
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346 * all the members. |
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347 * Note the close similarity with StructDeclaration::buildPostBlit(), |
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348 * and the ordering changes (runs backward instead of forwards). |
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349 */ |
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350 |
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351 FuncDeclaration *AggregateDeclaration::buildDtor(Scope *sc) |
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352 { |
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353 //printf("AggregateDeclaration::buildDtor() %s\n", toChars()); |
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354 Expression *e = NULL; |
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355 |
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356 #if DMDV2 |
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357 for (size_t i = 0; i < fields.dim; i++) |
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358 { |
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359 Dsymbol *s = (Dsymbol *)fields.data[i]; |
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360 VarDeclaration *v = s->isVarDeclaration(); |
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361 assert(v && v->storage_class & STCfield); |
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362 Type *tv = v->type->toBasetype(); |
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363 size_t dim = 1; |
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364 while (tv->ty == Tsarray) |
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365 { TypeSArray *ta = (TypeSArray *)tv; |
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366 dim *= ((TypeSArray *)tv)->dim->toInteger(); |
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367 tv = tv->nextOf()->toBasetype(); |
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368 } |
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369 if (tv->ty == Tstruct) |
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370 { TypeStruct *ts = (TypeStruct *)tv; |
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371 StructDeclaration *sd = ts->sym; |
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372 if (sd->dtor) |
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373 { Expression *ex; |
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374 |
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375 // this.v |
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376 ex = new ThisExp(0); |
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377 ex = new DotVarExp(0, ex, v, 0); |
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378 |
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379 if (dim == 1) |
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380 { // this.v.dtor() |
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381 ex = new DotVarExp(0, ex, sd->dtor, 0); |
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382 ex = new CallExp(0, ex); |
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383 } |
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384 else |
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385 { |
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386 // Typeinfo.destroy(cast(void*)&this.v); |
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387 Expression *ea = new AddrExp(0, ex); |
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388 ea = new CastExp(0, ea, Type::tvoid->pointerTo()); |
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389 |
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390 Expression *et = v->type->getTypeInfo(sc); |
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391 et = new DotIdExp(0, et, Id::destroy); |
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392 |
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393 ex = new CallExp(0, et, ea); |
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394 } |
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395 e = Expression::combine(ex, e); // combine in reverse order |
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396 } |
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397 } |
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398 } |
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399 |
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400 /* Build our own "destructor" which executes e |
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401 */ |
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402 if (e) |
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403 { //printf("Building __fieldDtor()\n"); |
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404 DtorDeclaration *dd = new DtorDeclaration(0, 0, Lexer::idPool("__fieldDtor")); |
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405 dd->fbody = new ExpStatement(0, e); |
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406 dtors.shift(dd); |
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407 members->push(dd); |
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408 dd->semantic(sc); |
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409 } |
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410 #endif |
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411 |
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412 switch (dtors.dim) |
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413 { |
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414 case 0: |
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415 return NULL; |
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416 |
f04dde6e882c
Added initial D2 support, D2 frontend and changes to codegen to make things compile.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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417 case 1: |
f04dde6e882c
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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418 return (FuncDeclaration *)dtors.data[0]; |
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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419 |
f04dde6e882c
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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420 default: |
f04dde6e882c
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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421 e = NULL; |
f04dde6e882c
Added initial D2 support, D2 frontend and changes to codegen to make things compile.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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422 for (size_t i = 0; i < dtors.dim; i++) |
f04dde6e882c
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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423 { FuncDeclaration *fd = (FuncDeclaration *)dtors.data[i]; |
f04dde6e882c
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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424 Expression *ex = new ThisExp(0); |
f04dde6e882c
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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425 ex = new DotVarExp(0, ex, fd, 0); |
f04dde6e882c
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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426 ex = new CallExp(0, ex); |
f04dde6e882c
Added initial D2 support, D2 frontend and changes to codegen to make things compile.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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427 e = Expression::combine(ex, e); |
f04dde6e882c
Added initial D2 support, D2 frontend and changes to codegen to make things compile.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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428 } |
f04dde6e882c
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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429 DtorDeclaration *dd = new DtorDeclaration(0, 0, Lexer::idPool("__aggrDtor")); |
f04dde6e882c
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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430 dd->fbody = new ExpStatement(0, e); |
f04dde6e882c
Added initial D2 support, D2 frontend and changes to codegen to make things compile.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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431 members->push(dd); |
f04dde6e882c
Added initial D2 support, D2 frontend and changes to codegen to make things compile.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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432 dd->semantic(sc); |
f04dde6e882c
Added initial D2 support, D2 frontend and changes to codegen to make things compile.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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433 return dd; |
f04dde6e882c
Added initial D2 support, D2 frontend and changes to codegen to make things compile.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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434 } |
f04dde6e882c
Added initial D2 support, D2 frontend and changes to codegen to make things compile.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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435 } |
f04dde6e882c
Added initial D2 support, D2 frontend and changes to codegen to make things compile.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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436 |
f04dde6e882c
Added initial D2 support, D2 frontend and changes to codegen to make things compile.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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437 |