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1 module dmd.WithStatement;
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2
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114
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3 import dmd.common;
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4 import dmd.Statement;
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5 import dmd.Expression;
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6 import dmd.VarDeclaration;
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7 import dmd.Loc;
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8 import dmd.OutBuffer;
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129
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9 import dmd.ScopeDsymbol;
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10 import dmd.TypeExp;
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11 import dmd.TOK;
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12 import dmd.Initializer;
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13 import dmd.ExpInitializer;
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14 import dmd.Id;
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15 import dmd.ScopeExp;
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16 import dmd.WithScopeSymbol;
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17 import dmd.TY;
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18 import dmd.Type;
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19 import dmd.HdrGenState;
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20 import dmd.InlineScanState;
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21 import dmd.IRState;
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22 import dmd.Scope;
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23 import dmd.BE;
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24
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129
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25 import dmd.backend.Symbol;
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26 import dmd.backend.block;
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27 import dmd.backend.Blockx;
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28 import dmd.backend.elem;
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29 import dmd.backend.Util;
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30 import dmd.backend.OPER;
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31
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32 class WithStatement : Statement
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33 {
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34 Expression exp;
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35 Statement body_;
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36 VarDeclaration wthis;
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37
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38 this(Loc loc, Expression exp, Statement body_)
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39 {
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178
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40 register();
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41 super(loc);
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49
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42 this.exp = exp;
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43 this.body_ = body_;
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44 wthis = null;
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45 }
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46
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47 override Statement syntaxCopy()
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48 {
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49 WithStatement s = new WithStatement(loc, exp.syntaxCopy(), body_ ? body_.syntaxCopy() : null);
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50 return s;
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51 }
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52
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72
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53 override Statement semantic(Scope sc)
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54 {
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129
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55 ScopeDsymbol sym;
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56 Initializer init;
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57
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58 //printf("WithStatement.semantic()\n");
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59 exp = exp.semantic(sc);
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60 exp = resolveProperties(sc, exp);
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61 if (exp.op == TOKimport)
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62 {
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63 ScopeExp es = cast(ScopeExp)exp;
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64
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65 sym = es.sds;
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66 }
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67 else if (exp.op == TOKtype)
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68 {
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69 TypeExp es = cast(TypeExp)exp;
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70
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71 sym = es.type.toDsymbol(sc).isScopeDsymbol();
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72 if (!sym)
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73 {
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74 error("%s has no members", es.toChars());
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75 body_ = body_.semantic(sc);
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76 return this;
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77 }
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78 }
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79 else
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80 {
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81 Type t = exp.type;
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82
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83 assert(t);
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84 t = t.toBasetype();
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85 if (t.isClassHandle())
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86 {
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87 init = new ExpInitializer(loc, exp);
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88 wthis = new VarDeclaration(loc, exp.type, Id.withSym, init);
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89 wthis.semantic(sc);
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90
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91 sym = new WithScopeSymbol(this);
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92 sym.parent = sc.scopesym;
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93 }
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94 else if (t.ty == Tstruct)
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95 {
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96 Expression e = exp.addressOf(sc);
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97 init = new ExpInitializer(loc, e);
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98 wthis = new VarDeclaration(loc, e.type, Id.withSym, init);
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99 wthis.semantic(sc);
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100 sym = new WithScopeSymbol(this);
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101 sym.parent = sc.scopesym;
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102 }
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103 else
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104 {
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105 error("with expressions must be class objects, not '%s'", exp.type.toChars());
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106 return null;
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107 }
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108 }
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109 sc = sc.push(sym);
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110
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111 if (body_)
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112 body_ = body_.semantic(sc);
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113
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114 sc.pop();
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115
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116 return this;
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117 }
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118
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72
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119 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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120 {
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121 assert(false);
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122 }
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123
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72
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124 override bool usesEH()
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125 {
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126 assert(false);
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127 }
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128
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129 override BE blockExit()
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130 {
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129
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131 BE result = BEnone;
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132 if (exp.canThrow())
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133 result = BEthrow;
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134 if (body_)
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135 result |= body_.blockExit();
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136 else
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137 result |= BEfallthru;
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138 return result;
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139 }
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140
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141 override Statement inlineScan(InlineScanState* iss)
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142 {
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143 assert(false);
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144 }
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145
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72
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146 override void toIR(IRState* irs)
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147 {
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129
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148 Symbol* sp;
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149 elem* e;
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150 elem* ei;
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151 ExpInitializer ie;
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152 Blockx* blx = irs.blx;
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153
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154 //printf("WithStatement.toIR()\n");
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155 if (exp.op == TOKimport || exp.op == TOKtype)
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156 {
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157 }
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158 else
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159 {
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160 // Declare with handle
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161 sp = wthis.toSymbol();
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162 symbol_add(sp);
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163
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164 // Perform initialization of with handle
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165 ie = wthis.init.isExpInitializer();
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166 assert(ie);
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167 ei = ie.exp.toElem(irs);
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168 e = el_var(sp);
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169 e = el_bin(OPeq,e.Ety, e, ei);
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170 elem_setLoc(e, loc);
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171 incUsage(irs, loc);
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172 block_appendexp(blx.curblock,e);
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173 }
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174 // Execute with block
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175 if (body_)
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176 body_.toIR(irs);
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177 }
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72
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178 }
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