Mercurial > projects > ddmd
annotate dmd/LabelStatement.d @ 187:b0d41ff5e0df
Added expandability scheme outlined in http://www.dsource.org/forums/viewtopic.php?t=5659&sid=6f2150ff5b0bffcd47512a6a7608d218
| author | Abscissa |
|---|---|
| date | Tue, 07 Jun 2011 23:37:34 -0400 |
| parents | e3afd1303184 |
| children |
| rev | line source |
|---|---|
| 0 | 1 module dmd.LabelStatement; |
| 2 | |
| 114 | 3 import dmd.common; |
| 0 | 4 import dmd.Statement; |
| 5 import dmd.Identifier; | |
| 6 import dmd.TryFinallyStatement; | |
| 7 import dmd.Scope; | |
| 8 import dmd.Loc; | |
| 9 import dmd.ExpStatement; | |
| 10 import dmd.ArrayTypes; | |
| 11 import dmd.Expression; | |
| 12 import dmd.InterState; | |
| 13 import dmd.InlineScanState; | |
| 14 import dmd.LabelDsymbol; | |
| 15 import dmd.FuncDeclaration; | |
| 16 import dmd.CSX; | |
| 17 import dmd.IRState; | |
| 18 import dmd.OutBuffer; | |
| 19 import dmd.HdrGenState; | |
| 20 import dmd.BE; | |
| 21 | |
| 22 import dmd.backend.block; | |
| 23 import dmd.backend.Blockx; | |
| 24 import dmd.backend.Util; | |
| 25 import dmd.backend.BC; | |
| 26 | |
|
187
b0d41ff5e0df
Added expandability scheme outlined in http://www.dsource.org/forums/viewtopic.php?t=5659&sid=6f2150ff5b0bffcd47512a6a7608d218
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27 import dmd.DDMDExtensions; |
|
b0d41ff5e0df
Added expandability scheme outlined in http://www.dsource.org/forums/viewtopic.php?t=5659&sid=6f2150ff5b0bffcd47512a6a7608d218
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28 |
| 0 | 29 class LabelStatement : Statement |
| 30 { | |
|
187
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Added expandability scheme outlined in http://www.dsource.org/forums/viewtopic.php?t=5659&sid=6f2150ff5b0bffcd47512a6a7608d218
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31 mixin insertMemberExtension!(typeof(this)); |
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Added expandability scheme outlined in http://www.dsource.org/forums/viewtopic.php?t=5659&sid=6f2150ff5b0bffcd47512a6a7608d218
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32 |
| 0 | 33 Identifier ident; |
| 34 Statement statement; | |
| 35 TryFinallyStatement tf = null; | |
| 36 block* lblock = null; // back end | |
| 37 int isReturnLabel = 0; | |
| 38 | |
| 39 this(Loc loc, Identifier ident, Statement statement) | |
| 40 { | |
| 178 | 41 register(); |
| 0 | 42 super(loc); |
| 43 this.ident = ident; | |
| 44 this.statement = statement; | |
| 45 } | |
| 46 | |
| 72 | 47 override Statement syntaxCopy() |
| 0 | 48 { |
| 49 LabelStatement s = new LabelStatement(loc, ident, statement.syntaxCopy()); | |
| 50 return s; | |
| 51 } | |
| 52 | |
| 72 | 53 override Statement semantic(Scope sc) |
| 0 | 54 { |
| 55 LabelDsymbol ls; | |
| 56 FuncDeclaration fd = sc.parent.isFuncDeclaration(); | |
| 57 | |
| 58 //printf("LabelStatement.semantic()\n"); | |
| 59 ls = fd.searchLabel(ident); | |
| 60 if (ls.statement) | |
| 61 error("Label '%s' already defined", ls.toChars()); | |
| 62 else | |
| 63 ls.statement = this; | |
| 64 tf = sc.tf; | |
| 65 sc = sc.push(); | |
| 66 sc.scopesym = sc.enclosing.scopesym; | |
| 67 sc.callSuper |= CSXlabel; | |
| 68 sc.slabel = this; | |
| 69 if (statement) | |
| 70 statement = statement.semantic(sc); | |
| 71 sc.pop(); | |
| 72 return this; | |
| 73 } | |
| 74 | |
| 72 | 75 override Statements flatten(Scope sc) |
| 0 | 76 { |
| 77 Statements a = null; | |
| 78 | |
| 79 if (statement) | |
| 80 { | |
| 81 a = statement.flatten(sc); | |
| 82 if (a) | |
| 83 { | |
| 84 if (!a.dim) | |
|
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Statements -> Vector
Eldar Insafutdinov <e.insafutdinov@gmail.com>
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85 a.push(new ExpStatement(loc, null)); |
| 0 | 86 |
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Statements -> Vector
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87 Statement s = a[0]; |
| 0 | 88 |
| 89 s = new LabelStatement(loc, ident, s); | |
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Statements -> Vector
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parents:
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90 a[0] = s; |
| 0 | 91 } |
| 92 } | |
| 93 | |
| 94 return a; | |
| 95 } | |
| 96 | |
| 72 | 97 override bool usesEH() |
| 0 | 98 { |
| 99 return statement ? statement.usesEH() : false; | |
| 100 } | |
| 101 | |
| 72 | 102 override BE blockExit() |
| 0 | 103 { |
| 104 //printf("LabelStatement.blockExit(%p)\n", this); | |
| 105 return statement ? statement.blockExit() : BE.BEfallthru; | |
| 106 } | |
| 107 | |
| 72 | 108 override bool comeFrom() |
| 0 | 109 { |
| 110 //printf("LabelStatement.comeFrom()\n"); | |
| 111 return true; | |
| 112 } | |
| 113 | |
| 72 | 114 override Expression interpret(InterState istate) |
| 0 | 115 { |
| 116 assert(false); | |
| 117 } | |
| 118 | |
| 72 | 119 override void toCBuffer(OutBuffer buf, HdrGenState* hgs) |
| 0 | 120 { |
| 121 buf.writestring(ident.toChars()); | |
| 122 buf.writebyte(':'); | |
| 123 buf.writenl(); | |
| 124 if (statement) | |
| 125 statement.toCBuffer(buf, hgs); | |
| 126 } | |
| 127 | |
| 72 | 128 override Statement inlineScan(InlineScanState* iss) |
| 0 | 129 { |
| 130 if (statement) | |
| 131 statement = statement.inlineScan(iss); | |
| 132 return this; | |
| 133 } | |
| 134 | |
| 72 | 135 override void toIR(IRState* irs) |
| 0 | 136 { |
| 137 //printf("LabelStatement.toIR() %p, statement = %p\n", this, statement); | |
| 138 Blockx* blx = irs.blx; | |
| 139 block* bc = blx.curblock; | |
| 140 IRState mystate = IRState(irs,this); | |
| 141 mystate.ident = ident; | |
| 142 | |
| 143 if (lblock) | |
| 144 { | |
| 145 // We had made a guess about which tryblock the label is in. | |
| 146 // Error if we guessed wrong. | |
| 147 // BUG: should fix this | |
| 148 if (lblock.Btry != blx.tryblock) | |
| 149 error("cannot goto forward into different try block level"); | |
| 150 } | |
| 151 else | |
| 152 lblock = block_calloc(blx); | |
| 153 | |
| 154 block_next(blx,BCgoto,lblock); | |
| 155 list_append(&bc.Bsucc,blx.curblock); | |
| 156 if (statement) | |
| 157 statement.toIR(&mystate); | |
| 158 } | |
| 72 | 159 } |