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view dmd/AndAndExp.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 | 52188e7e3fb5 |
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module dmd.AndAndExp; import dmd.common; import dmd.Expression; import dmd.InterState; import dmd.Loc; import dmd.Scope; import dmd.IRState; import dmd.CommaExp; import dmd.Global; import dmd.BoolExp; import dmd.BinExp; import dmd.TOK; import dmd.WANT; import dmd.IntegerExp; import dmd.Type; import dmd.TY; import dmd.backend.elem; import dmd.backend.OPER; import dmd.backend.Util; import dmd.DDMDExtensions; class AndAndExp : BinExp { mixin insertMemberExtension!(typeof(this)); this(Loc loc, Expression e1, Expression e2) { register(); super(loc, TOK.TOKandand, AndAndExp.sizeof, e1, e2); } override Expression semantic(Scope sc) { uint cs1; // same as for OrOr e1 = e1.semantic(sc); e1 = resolveProperties(sc, e1); e1 = e1.checkToPointer(); e1 = e1.checkToBoolean(); cs1 = sc.callSuper; if (sc.flags & SCOPE.SCOPEstaticif) { /* If in static if, don't evaluate e2 if we don't have to. */ e1 = e1.optimize(WANTflags); if (e1.isBool(false)) { return new IntegerExp(loc, 0, Type.tboolean); } } e2 = e2.semantic(sc); sc.mergeCallSuper(loc, cs1); e2 = resolveProperties(sc, e2); e2 = e2.checkToPointer(); type = Type.tboolean; if (e2.type.ty == Tvoid) type = Type.tvoid; if (e2.op == TOKtype || e2.op == TOKimport) error("%s is not an expression", e2.toChars()); return this; } override Expression checkToBoolean() { e2 = e2.checkToBoolean(); return this; } override int isBit() { assert(false); } override Expression optimize(int result) { //printf("AndAndExp::optimize(%d) %s\n", result, toChars()); e1 = e1.optimize(WANTflags | (result & WANTinterpret)); Expression e = this; if (e1.isBool(false)) { e = new CommaExp(loc, e1, new IntegerExp(loc, 0, type)); e.type = type; e = e.optimize(result); } else { e2 = e2.optimize(WANTflags | (result & WANTinterpret)); if (result && e2.type.toBasetype().ty == Tvoid && !global.errors) error("void has no value"); if (e1.isConst()) { if (e2.isConst()) { int n1 = e1.isBool(1); int n2 = e2.isBool(1); e = new IntegerExp(loc, n1 && n2, type); } else if (e1.isBool(true)) e = new BoolExp(loc, e2, type); } } return e; } override Expression interpret(InterState istate) { assert(false); } override bool checkSideEffect(int flag) { assert(false); } override elem* toElem(IRState* irs) { elem* e = toElemBin(irs, OPandand); if (global.params.cov && e2.loc.linnum) e.E2() = el_combine(incUsageElem(irs, e2.loc), e.E2); return e; } }