Mercurial > projects > ddmd
annotate dmd/GotoStatement.d @ 161:584dc990e12f
type fixed
| author | korDen |
|---|---|
| date | Mon, 20 Sep 2010 01:19:36 +0400 |
| parents | c77e9f4f1793 |
| children | e3afd1303184 |
| rev | line source |
|---|---|
| 0 | 1 module dmd.GotoStatement; |
| 2 | |
| 114 | 3 import dmd.common; |
| 0 | 4 import dmd.Loc; |
| 5 import dmd.Scope; | |
| 6 import dmd.Statement; | |
| 7 import dmd.Identifier; | |
| 8 import dmd.CompoundStatement; | |
| 9 import dmd.LabelDsymbol; | |
| 10 import dmd.TryFinallyStatement; | |
| 11 import dmd.FuncDeclaration; | |
| 12 import dmd.OutBuffer; | |
| 13 import dmd.HdrGenState; | |
| 14 import dmd.Expression; | |
| 15 import dmd.InterState; | |
| 16 import dmd.IRState; | |
| 17 import dmd.ArrayTypes; | |
| 18 import dmd.BE; | |
| 19 | |
| 20 import dmd.codegen.Util; | |
| 21 import dmd.backend.Util; | |
| 22 import dmd.backend.block; | |
| 23 import dmd.backend.Blockx; | |
| 24 import dmd.backend.BC; | |
| 25 | |
| 26 class GotoStatement : Statement | |
| 27 { | |
| 28 Identifier ident; | |
| 29 LabelDsymbol label = null; | |
| 30 TryFinallyStatement tf = null; | |
| 31 | |
| 32 this(Loc loc, Identifier ident) | |
| 33 { | |
| 34 super(loc); | |
| 35 this.ident = ident; | |
| 36 } | |
| 37 | |
| 72 | 38 override Statement syntaxCopy() |
| 0 | 39 { |
| 40 GotoStatement s = new GotoStatement(loc, ident); | |
| 41 return s; | |
| 42 } | |
| 43 | |
| 72 | 44 override Statement semantic(Scope sc) |
| 0 | 45 { |
| 46 FuncDeclaration fd = sc.parent.isFuncDeclaration(); | |
| 47 | |
| 48 //printf("GotoStatement.semantic()\n"); | |
| 49 tf = sc.tf; | |
| 50 label = fd.searchLabel(ident); | |
| 51 if (!label.statement && sc.fes) | |
| 52 { | |
| 53 /* Either the goto label is forward referenced or it | |
| 54 * is in the function that the enclosing foreach is in. | |
| 55 * Can't know yet, so wrap the goto in a compound statement | |
| 56 * so we can patch it later, and add it to a 'look at this later' | |
| 57 * list. | |
| 58 */ | |
|
122
c77e9f4f1793
Statements -> Vector
Eldar Insafutdinov <e.insafutdinov@gmail.com>
parents:
114
diff
changeset
|
59 auto a = new Statements(); |
| 0 | 60 Statement s; |
| 61 | |
|
122
c77e9f4f1793
Statements -> Vector
Eldar Insafutdinov <e.insafutdinov@gmail.com>
parents:
114
diff
changeset
|
62 a.push(this); |
| 0 | 63 s = new CompoundStatement(loc, a); |
| 64 sc.fes.gotos.push(cast(void*)s); // 'look at this later' list | |
| 65 return s; | |
| 66 } | |
| 67 | |
| 68 if (label.statement && label.statement.tf != sc.tf) | |
| 69 error("cannot goto in or out of finally block"); | |
| 70 return this; | |
| 71 } | |
| 72 | |
| 72 | 73 override BE blockExit() |
| 0 | 74 { |
| 75 //printf("GotoStatement.blockExit(%p)\n", this); | |
| 76 return BE.BEgoto; | |
| 77 } | |
| 78 | |
| 72 | 79 override Expression interpret(InterState istate) |
| 0 | 80 { |
| 81 assert(false); | |
| 82 } | |
| 83 | |
| 72 | 84 override void toIR(IRState* irs) |
| 0 | 85 { |
| 86 block* b; | |
| 87 block* bdest; | |
| 88 Blockx* blx = irs.blx; | |
| 89 | |
| 90 if (!label.statement) | |
| 91 { | |
| 92 error("label %s is undefined", label.toChars()); | |
| 93 return; | |
| 94 } | |
| 95 if (tf !is label.statement.tf) | |
| 96 error("cannot goto forward out of or into finally block"); | |
| 97 | |
| 98 bdest = labelToBlock(loc, blx, label); | |
| 99 if (!bdest) | |
| 100 return; | |
| 101 b = blx.curblock; | |
| 102 incUsage(irs, loc); | |
| 103 | |
| 104 // Adjust exception handler scope index if in different try blocks | |
| 105 if (b.Btry != bdest.Btry) | |
| 106 { | |
| 107 // Check that bdest is in an enclosing try block | |
| 108 for (block* bt = b.Btry; bt != bdest.Btry; bt = bt.Btry) | |
| 109 { | |
| 110 if (!bt) | |
| 111 { | |
| 112 //printf("b.Btry = %p, bdest.Btry = %p\n", b.Btry, bdest.Btry); | |
| 113 error("cannot goto into try block"); | |
| 114 break; | |
| 115 } | |
| 116 } | |
| 117 | |
| 118 //setScopeIndex(blx, b, bdest.Btry ? bdest.Btry.Bscope_index : -1); | |
| 119 } | |
| 120 | |
| 121 list_append(&b.Bsucc,bdest); | |
| 122 block_next(blx,BCgoto,null); | |
| 123 } | |
| 124 | |
| 72 | 125 override void toCBuffer(OutBuffer buf, HdrGenState* hgs) |
| 0 | 126 { |
| 127 buf.writestring("goto "); | |
| 128 buf.writestring(ident.toChars()); | |
| 129 buf.writebyte(';'); | |
| 130 buf.writenl(); | |
| 131 } | |
| 132 | |
| 72 | 133 override GotoStatement isGotoStatement() { return this; } |
| 134 } |