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1 module dmd.TryFinallyStatement;
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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.OutBuffer;
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6 import dmd.HdrGenState;
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7 import dmd.Scope;
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8 import dmd.InlineScanState;
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9 import dmd.CompoundStatement;
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10 import dmd.IRState;
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11 import dmd.BE;
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12
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13 import dmd.backend.block;
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14 import dmd.backend.Blockx;
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15 import dmd.backend.BC;
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16 import dmd.backend.Util;
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17
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18 import dmd.codegen.Util;
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19
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20 class TryFinallyStatement : Statement
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21 {
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22 Statement body_;
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23 Statement finalbody;
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24
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25 this(Loc loc, Statement body_, Statement finalbody)
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26 {
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27 super(loc);
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28 this.body_ = body_;
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29 this.finalbody = finalbody;
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30 }
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31
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72
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32 override Statement syntaxCopy()
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33 {
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34 assert(false);
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35 }
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36
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72
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37 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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38 {
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39 assert(false);
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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("TryFinallyStatement::semantic()\n");
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45 body_ = body_.semantic(sc);
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46 sc = sc.push();
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47 sc.tf = this;
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48 sc.sbreak = null;
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49 sc.scontinue = null; // no break or continue out of finally block
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50 finalbody = finalbody.semantic(sc);
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51 sc.pop();
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52 if (!body_)
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53 return finalbody;
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54 if (!finalbody)
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55 return body_;
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56 if (body_.blockExit() == BE.BEfallthru)
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57 {
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58 Statement s = new CompoundStatement(loc, body_, finalbody);
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59 return s;
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60 }
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61 return this;
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62 }
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63
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72
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64 override bool hasBreak()
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65 {
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66 assert(false);
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67 }
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68
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72
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69 override bool hasContinue()
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70 {
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71 assert(false);
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72 }
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73
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74 override bool usesEH()
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75 {
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76 assert(false);
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77 }
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78
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72
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79 override BE blockExit()
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80 {
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81 if (body_)
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82 return body_.blockExit();
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83 return BE.BEfallthru;
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84 }
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85
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86 override Statement inlineScan(InlineScanState* iss)
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87 {
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88 if (body_)
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89 body_ = body_.inlineScan(iss);
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90 if (finalbody)
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91 finalbody = finalbody.inlineScan(iss);
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92 return this;
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93 }
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94
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95 /****************************************
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96 * A try-finally statement.
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97 * Builds the following:
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98 * _try
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99 * block
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100 * _finally
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101 * finalbody
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102 * _ret
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103 */
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104 override void toIR(IRState* irs)
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105 {
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106 //printf("TryFinallyStatement.toIR()\n");
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107 Blockx* blx = irs.blx;
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108
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109 version (SEH) {
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110 nteh_declarvars(blx);
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111 }
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112
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113 block* tryblock = block_goto(blx, BCgoto, null);
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114
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115 int previndex = blx.scope_index;
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116 tryblock.Blast_index = previndex;
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117 tryblock.Bscope_index = blx.next_index++;
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118 blx.scope_index = tryblock.Bscope_index;
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119
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120 // Current scope index
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121 setScopeIndex(blx,tryblock,tryblock.Bscope_index);
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122
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123 blx.tryblock = tryblock;
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124 block_goto(blx,BC_try,null);
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125
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126 IRState bodyirs = IRState(irs, this);
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127 block* breakblock = block_calloc(blx);
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128 block* contblock = block_calloc(blx);
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129
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130 if (body_)
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131 body_.toIR(&bodyirs);
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132 blx.tryblock = tryblock.Btry; // back to previous tryblock
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133
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134 setScopeIndex(blx,blx.curblock,previndex);
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135 blx.scope_index = previndex;
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136
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137 block_goto(blx,BCgoto, breakblock);
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138 block* finallyblock = block_goto(blx,BCgoto,contblock);
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139
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140 list_append(&tryblock.Bsucc,finallyblock);
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141
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142 block_goto(blx,BC_finally,null);
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143
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144 IRState finallyState = IRState(irs, this);
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145 breakblock = block_calloc(blx);
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146 contblock = block_calloc(blx);
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147
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148 setScopeIndex(blx, blx.curblock, previndex);
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149 if (finalbody)
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150 finalbody.toIR(&finallyState);
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151 block_goto(blx, BCgoto, contblock);
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152 block_goto(blx, BCgoto, breakblock);
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153
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154 block* retblock = blx.curblock;
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155 block_next(blx,BC_ret,null);
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156
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157 list_append(&finallyblock.Bsucc, blx.curblock);
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158 list_append(&retblock.Bsucc, blx.curblock);
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159 }
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72
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160 }
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