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1 module dmd.BreakStatement;
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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.Loc;
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6 import dmd.Identifier;
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7 import dmd.Scope;
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8 import dmd.Expression;
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9 import dmd.InterState;
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10 import dmd.OutBuffer;
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11 import dmd.HdrGenState;
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12 import dmd.IRState;
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13 import dmd.BE;
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14 import dmd.FuncDeclaration;
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15 import dmd.LabelStatement;
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16 import dmd.ReturnStatement;
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17 import dmd.IntegerExp;
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18
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19 import dmd.backend.Util;
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20 import dmd.backend.block;
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21 import dmd.backend.Blockx;
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22 import dmd.backend.BC;
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23
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24 class BreakStatement : 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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35 {
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36 BreakStatement s = new BreakStatement(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("BreakStatement::semantic()\n");
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43 // If:
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44 // break Identifier;
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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 /* Post this statement to the fes, and replace
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59 * it with a return value that caller will put into
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60 * a switch. Caller will figure out where the break
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61 * label actually is.
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62 * Case numbers start with 2, not 0, as 0 is continue
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63 * and 1 is break.
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64 */
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65 Statement s;
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66 sc.fes.cases.push(cast(void*)this);
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67 s = new ReturnStatement(Loc(0), new IntegerExp(sc.fes.cases.dim + 1));
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68 return s;
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69 }
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70 break; // can't break to it
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71 }
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72
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73 ls = scx.slabel;
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74 if (ls && ls.ident == ident)
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75 {
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76 Statement s = ls.statement;
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77
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78 if (!s.hasBreak())
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79 error("label '%s' has no break", ident.toChars());
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80 if (ls.tf != sc.tf)
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81 error("cannot break out of finally block");
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82 return this;
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83 }
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84 }
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85 error("enclosing label '%s' for break not found", ident.toChars());
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86 }
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87 else if (!sc.sbreak)
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88 {
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89 if (sc.fes)
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90 {
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91 Statement s;
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92
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93 // Replace break; with return 1;
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94 s = new ReturnStatement(Loc(0), new IntegerExp(1));
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95 return s;
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96 }
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97 error("break is not inside a loop or switch");
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98 }
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99 return this;
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100 }
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101
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102 override Expression interpret(InterState istate)
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103 {
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104 assert(false);
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105 }
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106
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107 override BE blockExit()
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108 {
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109 //printf("BreakStatement::blockExit(%p) = x%x\n", this, ident ? BEgoto : BEbreak);
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110 return ident ? BE.BEgoto : BE.BEbreak;
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111 }
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112
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113 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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114 {
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115 assert(false);
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116 }
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117
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118 override void toIR(IRState* irs)
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119 {
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120 block* bbreak;
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121 block* b;
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122 Blockx* blx = irs.blx;
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123
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124 bbreak = irs.getBreakBlock(ident);
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125 assert(bbreak);
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126 b = blx.curblock;
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127 incUsage(irs, loc);
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128
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129 // Adjust exception handler scope index if in different try blocks
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130 if (b.Btry != bbreak.Btry)
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131 {
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132 //setScopeIndex(blx, b, bbreak.Btry ? bbreak.Btry.Bscope_index : -1);
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133 }
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134
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135 /* Nothing more than a 'goto' to the current break destination
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136 */
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137 list_append(&b.Bsucc, bbreak);
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138 block_next(blx, BCgoto, null);
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139 }
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72
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140 }
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