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1 module dmd.TryFinallyStatement;
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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.OutBuffer;
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7 import dmd.HdrGenState;
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8 import dmd.Scope;
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9 import dmd.InlineScanState;
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10 import dmd.CompoundStatement;
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11 import dmd.IRState;
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12 import dmd.BE;
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13
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14 import dmd.backend.block;
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15 import dmd.backend.Blockx;
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16 import dmd.backend.BC;
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17 import dmd.backend.Util;
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18
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19 import dmd.codegen.Util;
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20
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21 class TryFinallyStatement : Statement
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22 {
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23 Statement body_;
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24 Statement finalbody;
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25
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26 this(Loc loc, Statement body_, Statement finalbody)
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27 {
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28 super(loc);
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29 this.body_ = body_;
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30 this.finalbody = finalbody;
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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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35 assert(false);
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36 }
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37
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38 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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39 {
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40 assert(false);
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41 }
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42
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43 override Statement semantic(Scope sc)
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44 {
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45 //printf("TryFinallyStatement::semantic()\n");
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46 body_ = body_.semantic(sc);
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47 sc = sc.push();
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48 sc.tf = this;
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49 sc.sbreak = null;
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50 sc.scontinue = null; // no break or continue out of finally block
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51 finalbody = finalbody.semantic(sc);
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52 sc.pop();
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53 if (!body_)
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54 return finalbody;
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55 if (!finalbody)
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56 return body_;
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57 if (body_.blockExit() == BE.BEfallthru)
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58 {
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59 Statement s = new CompoundStatement(loc, body_, finalbody);
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60 return s;
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61 }
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62 return this;
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63 }
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64
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65 override bool hasBreak()
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66 {
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67 assert(false);
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68 }
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69
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72
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70 override bool hasContinue()
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71 {
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72 assert(false);
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73 }
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74
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75 override bool usesEH()
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76 {
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77 assert(false);
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78 }
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79
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80 override BE blockExit()
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81 {
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82 if (body_)
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83 return body_.blockExit();
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84 return BE.BEfallthru;
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85 }
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86
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87 override Statement inlineScan(InlineScanState* iss)
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88 {
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89 if (body_)
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90 body_ = body_.inlineScan(iss);
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91 if (finalbody)
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92 finalbody = finalbody.inlineScan(iss);
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93 return this;
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94 }
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95
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96 /****************************************
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97 * A try-finally statement.
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98 * Builds the following:
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99 * _try
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100 * block
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101 * _finally
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102 * finalbody
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103 * _ret
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104 */
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105 override void toIR(IRState* irs)
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106 {
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107 //printf("TryFinallyStatement.toIR()\n");
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108 Blockx* blx = irs.blx;
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109
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110 version (SEH) {
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111 nteh_declarvars(blx);
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112 }
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113
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114 block* tryblock = block_goto(blx, BCgoto, null);
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115
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116 int previndex = blx.scope_index;
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117 tryblock.Blast_index = previndex;
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118 tryblock.Bscope_index = blx.next_index++;
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119 blx.scope_index = tryblock.Bscope_index;
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120
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121 // Current scope index
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122 setScopeIndex(blx,tryblock,tryblock.Bscope_index);
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123
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124 blx.tryblock = tryblock;
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125 block_goto(blx,BC_try,null);
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126
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127 IRState bodyirs = IRState(irs, this);
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128 block* breakblock = block_calloc(blx);
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129 block* contblock = block_calloc(blx);
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130
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131 if (body_)
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132 body_.toIR(&bodyirs);
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133 blx.tryblock = tryblock.Btry; // back to previous tryblock
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134
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135 setScopeIndex(blx,blx.curblock,previndex);
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136 blx.scope_index = previndex;
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137
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138 block_goto(blx,BCgoto, breakblock);
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139 block* finallyblock = block_goto(blx,BCgoto,contblock);
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140
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141 list_append(&tryblock.Bsucc,finallyblock);
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142
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143 block_goto(blx,BC_finally,null);
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144
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145 IRState finallyState = IRState(irs, this);
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146 breakblock = block_calloc(blx);
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147 contblock = block_calloc(blx);
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148
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149 setScopeIndex(blx, blx.curblock, previndex);
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150 if (finalbody)
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151 finalbody.toIR(&finallyState);
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152 block_goto(blx, BCgoto, contblock);
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153 block_goto(blx, BCgoto, breakblock);
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154
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155 block* retblock = blx.curblock;
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156 block_next(blx,BC_ret,null);
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157
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158 list_append(&finallyblock.Bsucc, blx.curblock);
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159 list_append(&retblock.Bsucc, blx.curblock);
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160 }
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72
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161 }
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