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1 module dmd.CaseStatement;
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2
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3 import dmd.Statement;
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4 import dmd.Expression;
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5 import dmd.Statement;
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6 import dmd.Scope;
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7 import dmd.Loc;
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8 import dmd.IRState;
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9 import dmd.InlineScanState;
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10 import dmd.HdrGenState;
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11 import dmd.OutBuffer;
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12 import dmd.InterState;
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13 import dmd.BE;
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14 import dmd.SwitchStatement;
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15 import dmd.WANT;
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16 import dmd.TOK;
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17 import dmd.VarExp;
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18 import dmd.VarDeclaration;
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19 import dmd.Type;
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20 import dmd.TY;
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21 import dmd.IntegerExp;
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22 import dmd.GotoCaseStatement;
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23
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24 import dmd.backend.block;
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25 import dmd.backend.Blockx;
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26 import dmd.backend.Util;
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27 import dmd.backend.BC;
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28
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29 class CaseStatement : Statement
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30 {
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31 Expression exp;
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32 Statement statement;
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33
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34 int index = 0; // which case it is (since we sort this)
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35 block* cblock = null; // back end: label for the block
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36
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37 this(Loc loc, Expression exp, Statement s)
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38 {
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39 super(loc);
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40
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41 this.exp = exp;
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42 this.statement = s;
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43 }
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44
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45 Statement syntaxCopy()
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46 {
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47 assert(false);
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48 }
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49
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50 Statement semantic(Scope sc)
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51 {
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52 SwitchStatement sw = sc.sw;
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53
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54 //printf("CaseStatement.semantic() %s\n", toChars());
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55 exp = exp.semantic(sc);
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56 if (sw)
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57 {
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58 exp = exp.implicitCastTo(sc, sw.condition.type);
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59 exp = exp.optimize(WANTvalue | WANTinterpret);
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60
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61 /* This is where variables are allowed as case expressions.
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62 */
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63 if (exp.op == TOKvar)
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64 { VarExp ve = cast(VarExp)exp;
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65 VarDeclaration v = ve.var.isVarDeclaration();
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66 Type t = exp.type.toBasetype();
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67 if (v && (t.isintegral() || t.ty == Tclass))
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68 {
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69 /* Flag that we need to do special code generation
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70 * for this, i.e. generate a sequence of if-then-else
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71 */
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72 sw.hasVars = 1;
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73 if (sw.isFinal)
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74 error("case variables not allowed in final switch statements");
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75 goto L1;
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76 }
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77 }
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78
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79 if (exp.op != TOKstring && exp.op != TOKint64)
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80 {
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81 error("case must be a string or an integral constant, not %s", exp.toChars());
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82 exp = new IntegerExp(0);
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83 }
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84
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85 L1:
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86 for (int i = 0; i < sw.cases.dim; i++)
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87 {
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88 CaseStatement cs = cast(CaseStatement)sw.cases.data[i];
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89
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90 //printf("comparing '%s' with '%s'\n", exp.toChars(), cs.exp.toChars());
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91 if (cs.exp.equals(exp))
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92 {
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93 error("duplicate case %s in switch statement", exp.toChars());
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94 break;
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95 }
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96 }
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97
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98 sw.cases.push(cast(void*)this);
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99
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100 // Resolve any goto case's with no exp to this case statement
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101 for (int i = 0; i < sw.gotoCases.dim; i++)
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102 {
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103 GotoCaseStatement gcs = cast(GotoCaseStatement)sw.gotoCases.data[i];
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104
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105 if (!gcs.exp)
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106 {
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107 gcs.cs = this;
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108 sw.gotoCases.remove(i); // remove from array
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109 }
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110 }
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111
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112 if (sc.sw.tf !is sc.tf)
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113 error("switch and case are in different finally blocks");
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114 }
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115 else
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116 error("case not in switch statement");
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117 statement = statement.semantic(sc);
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118 return this;
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119 }
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120
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121 int compare(Object obj)
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122 {
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123 assert(false);
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124 }
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125
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126 bool usesEH()
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127 {
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128 assert(false);
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129 }
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130
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131 BE blockExit()
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132 {
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133 return statement.blockExit();
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134 }
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135
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136 bool comeFrom()
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137 {
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138 return true;
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139 }
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140
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141 Expression interpret(InterState *istate)
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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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146 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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147 {
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148 assert(false);
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149 }
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150
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151 Statement inlineScan(InlineScanState* iss)
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152 {
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153 //printf("CaseStatement.inlineScan()\n");
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154 exp = exp.inlineScan(iss);
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155 if (statement)
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156 statement = statement.inlineScan(iss);
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157 return this;
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158 }
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159
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160 void toIR(IRState *irs)
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161 {
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162 Blockx* blx = irs.blx;
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163 block* bcase = blx.curblock;
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164 if (!cblock)
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165 cblock = block_calloc(blx);
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166 block_next(blx,BCgoto,cblock);
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167 block* bsw = irs.getSwitchBlock();
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168 if (bsw.BC == BCswitch)
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169 list_append(&bsw.Bsucc,cblock); // second entry in pair
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170 list_append(&bcase.Bsucc,cblock);
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171 if (blx.tryblock != bsw.Btry)
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172 error("case cannot be in different try block level from switch");
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173 incUsage(irs, loc);
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174 if (statement)
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175 statement.toIR(irs);
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176 }
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177 } |
