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