Mercurial > projects > ddmd
view dmd/GotoCaseStatement.d @ 187:b0d41ff5e0df
Added expandability scheme outlined in http://www.dsource.org/forums/viewtopic.php?t=5659&sid=6f2150ff5b0bffcd47512a6a7608d218
author | Abscissa |
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date | Tue, 07 Jun 2011 23:37:34 -0400 |
parents | e3afd1303184 |
children |
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module dmd.GotoCaseStatement; import dmd.common; import dmd.Statement; import dmd.Expression; import dmd.CaseStatement; import dmd.IRState; import dmd.Scope; import dmd.Loc; import dmd.InterState; import dmd.OutBuffer; import dmd.HdrGenState; import dmd.BE; import dmd.WANT; import dmd.backend.Util; import dmd.backend.block; import dmd.backend.BC; import dmd.backend.Blockx; import dmd.DDMDExtensions; class GotoCaseStatement : Statement { mixin insertMemberExtension!(typeof(this)); Expression exp; // NULL, or which case to goto CaseStatement cs; // case statement it resolves to this(Loc loc, Expression exp) { register(); super(loc); cs = null; this.exp = exp; } override Statement syntaxCopy() { Expression e = exp ? exp.syntaxCopy() : null; GotoCaseStatement s = new GotoCaseStatement(loc, e); return s; } override Statement semantic(Scope sc) { if (exp) exp = exp.semantic(sc); if (!sc.sw) error("goto case not in switch statement"); else { sc.sw.gotoCases.push(cast(void*)this); if (exp) { exp = exp.implicitCastTo(sc, sc.sw.condition.type); exp = exp.optimize(WANTvalue); } } return this; } override Expression interpret(InterState istate) { assert(false); } override BE blockExit() { return BEgoto; } override void toCBuffer(OutBuffer buf, HdrGenState* hgs) { buf.writestring("goto case"); if (exp) { buf.writebyte(' '); exp.toCBuffer(buf, hgs); } buf.writebyte(';'); buf.writenl(); } override void toIR(IRState* irs) { block* b; Blockx* blx = irs.blx; block* bdest = cs.cblock; if (!bdest) { bdest = block_calloc(blx); cs.cblock = bdest; } b = blx.curblock; // The rest is equivalent to GotoStatement // Adjust exception handler scope index if in different try blocks if (b.Btry != bdest.Btry) { // Check that bdest is in an enclosing try block for (block* bt = b.Btry; bt != bdest.Btry; bt = bt.Btry) { if (!bt) { //printf("b.Btry = %p, bdest.Btry = %p\n", b.Btry, bdest.Btry); error("cannot goto into try block"); break; } } //setScopeIndex(blx, b, bdest.Btry ? bdest.Btry.Bscope_index : -1); } list_append(&b.Bsucc,bdest); incUsage(irs, loc); block_next(blx, BC.BCgoto, null); } }