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1 module dmd.ContinueStatement;
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2
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114
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3 import dmd.common;
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155
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4 import dmd.interpret.Util;
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0
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5 import dmd.Statement;
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6 import dmd.FuncDeclaration;
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155
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7 import dmd.GlobalExpressions;
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0
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8 import dmd.IntegerExp;
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9 import dmd.ReturnStatement;
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10 import dmd.LabelStatement;
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11 import dmd.Identifier;
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12 import dmd.Loc;
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13 import dmd.Scope;
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14 import dmd.Expression;
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15 import dmd.InterState;
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16 import dmd.HdrGenState;
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17 import dmd.OutBuffer;
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18 import dmd.IRState;
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19 import dmd.BE;
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20
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21 import dmd.backend.Util;
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22 import dmd.backend.BC;
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23 import dmd.backend.block;
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24 import dmd.backend.Blockx;
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25
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26 class ContinueStatement : Statement
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27 {
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28 Identifier ident;
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29
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30 this(Loc loc, Identifier ident)
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31 {
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32 super(loc);
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33 this.ident = ident;
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34 }
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35
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72
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36 override Statement syntaxCopy()
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37 {
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38 ContinueStatement s = new ContinueStatement(loc, ident);
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39 return s;
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40 }
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41
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72
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42 override Statement semantic(Scope sc)
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43 {
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44 //printf("ContinueStatement.semantic() %p\n", this);
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45 if (ident)
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46 {
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47 Scope scx;
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48 FuncDeclaration thisfunc = sc.func;
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49
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50 for (scx = sc; scx; scx = scx.enclosing)
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51 {
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52 LabelStatement ls;
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53
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54 if (scx.func != thisfunc) // if in enclosing function
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55 {
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56 if (sc.fes) // if this is the body of a foreach
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57 {
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58 for (; scx; scx = scx.enclosing)
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59 {
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60 ls = scx.slabel;
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61 if (ls && ls.ident == ident && ls.statement == sc.fes)
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62 {
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63 // Replace continue ident; with return 0;
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64 return new ReturnStatement(Loc(0), new IntegerExp(0));
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65 }
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66 }
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67
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68 /* Post this statement to the fes, and replace
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69 * it with a return value that caller will put into
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70 * a switch. Caller will figure out where the break
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71 * label actually is.
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72 * Case numbers start with 2, not 0, as 0 is continue
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73 * and 1 is break.
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74 */
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75 Statement s;
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76 sc.fes.cases.push(cast(void*)this);
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77 s = new ReturnStatement(Loc(0), new IntegerExp(sc.fes.cases.dim + 1));
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78 return s;
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79 }
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80 break; // can't continue to it
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81 }
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82
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83 ls = scx.slabel;
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84 if (ls && ls.ident == ident)
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85 {
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86 Statement s = ls.statement;
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87
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88 if (!s.hasContinue())
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89 error("label '%s' has no continue", ident.toChars());
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90 if (ls.tf != sc.tf)
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91 error("cannot continue out of finally block");
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92 return this;
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93 }
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94 }
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95 error("enclosing label '%s' for continue not found", ident.toChars());
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96 }
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97 else if (!sc.scontinue)
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98 {
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99 if (sc.fes)
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100 {
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101 Statement s;
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102
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103 // Replace continue; with return 0;
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104 s = new ReturnStatement(Loc(0), new IntegerExp(0));
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105 return s;
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106 }
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107 error("continue is not inside a loop");
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108 }
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109 return this;
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110 }
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111
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72
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112 override Expression interpret(InterState istate)
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0
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113 {
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155
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114 version(LOG)
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115 writef("ContinueStatement::interpret()\n");
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116
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117 mixin(START);
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118 if (ident)
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119 return EXP_CANT_INTERPRET;
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120 else
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121 return EXP_CONTINUE_INTERPRET;
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0
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122 }
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123
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72
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124 override BE blockExit()
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0
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125 {
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126 return ident ? BE.BEgoto : BE.BEcontinue;
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127 }
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128
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72
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129 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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0
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130 {
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131 buf.writestring("continue");
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132 if (ident)
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133 {
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134 buf.writebyte(' ');
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135 buf.writestring(ident.toChars());
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136 }
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137 buf.writebyte(';');
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138 buf.writenl();
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139 }
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140
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72
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141 override void toIR(IRState* irs)
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0
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142 {
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143 block* bcont;
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144 block* b;
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145 Blockx* blx = irs.blx;
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146
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147 //printf("ContinueStatement.toIR() %p\n", this);
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148 bcont = irs.getContBlock(ident);
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149 assert(bcont);
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150 b = blx.curblock;
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151 incUsage(irs, loc);
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152
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153 // Adjust exception handler scope index if in different try blocks
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154 if (b.Btry != bcont.Btry)
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155 {
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156 //setScopeIndex(blx, b, bcont.Btry ? bcont.Btry.Bscope_index : -1);
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157 }
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158
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159 /* Nothing more than a 'goto' to the current continue destination
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160 */
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161 list_append(&b.Bsucc, bcont);
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162 block_next(blx, BCgoto, null);
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163 }
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72
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164 }
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