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