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