public EmitLoadDefault ( TypeSymbol type, TypeRefMask typemask ) : void | ||
type | TypeSymbol | |
typemask | TypeRefMask | |
리턴 | void |
internal override void Emit(CodeGenerator cg) { cg.EmitSequencePoint(this.PhpSyntax); var rtype = cg.Routine.ReturnType; var rvoid = rtype.SpecialType == SpecialType.System_Void; // if (this.Returned == null) { if (rvoid) { // <void> } else { // <default> cg.EmitLoadDefault(rtype, cg.Routine.ResultTypeMask); } } else { if (rvoid) { // <expr>; cg.EmitPop(this.Returned.Emit(cg)); } else { // return (T)<expr>; cg.EmitConvert(this.Returned, rtype); } } // .ret cg.EmitRet(rtype); }
/// <summary> /// Emits the given conversion. 'from' and 'to' matches the classified conversion. /// </summary> public static void EmitConversion(this CodeGenerator cg, CommonConversion conversion, TypeSymbol from, TypeSymbol to, TypeSymbol op = null, bool @checked = false) { // {from}, {op} is loaded on stack // if (conversion.Exists == false) { throw cg.NotImplementedException($"Conversion from '{from}' to '{to}' "); } if (conversion.IsNullable) { if (from.IsNullableType(out var ttype)) { if (op != null) { // TODO throw new ArgumentException(nameof(op)); } var lbltrue = new NamedLabel("has value"); var lblend = new NamedLabel("end"); var tmp = cg.GetTemporaryLocal(from, true); cg.Builder.EmitLocalStore(tmp); // Template: tmp.HasValue ? convert(tmp.Value) : default cg.Builder.EmitLocalAddress(tmp); cg.EmitCall(ILOpCode.Call, cg.DeclaringCompilation.System_Nullable_T_HasValue(from)); cg.Builder.EmitBranch(ILOpCode.Brtrue, lbltrue); // default: cg.EmitLoadDefault(to); cg.Builder.EmitBranch(ILOpCode.Br, lblend); // cg.Builder.AdjustStack(-1); // ? // lbltrue: cg.Builder.MarkLabel(lbltrue); // Template: convert( tmp.GetValueOrDefault() ) cg.Builder.EmitLocalAddress(tmp); cg.EmitCall(ILOpCode.Call, cg.DeclaringCompilation.System_Nullable_T_GetValueOrDefault(from)).Expect(ttype); EmitConversion(cg, conversion.WithIsNullable(false), ttype, to, op, @checked); // lblend: cg.Builder.MarkLabel(lblend); return; } if (to.IsNullableType(out ttype)) // NOTE: not used yet { // new Nullable<TType>( convert(from) ) EmitConversion(cg, conversion.WithIsNullable(false), from, ttype, op, @checked); cg.EmitCall(ILOpCode.Newobj, ((NamedTypeSymbol)to).InstanceConstructors[0]); // new Nullable<T>( STACK ) return; } throw Roslyn.Utilities.ExceptionUtilities.Unreachable; } if (conversion.IsIdentity) { if (op != null) { throw new ArgumentException(nameof(op)); } if (to.SpecialType == SpecialType.System_Void) { // POP cg.EmitPop(from); } // nop } else if (conversion.IsNumeric) { if (op != null) { throw new ArgumentException(nameof(op)); } EmitNumericConversion(cg, from, to, @checked: @checked); } else if (conversion.IsReference) { if (op != null) { throw new ArgumentException(nameof(op)); } // TODO: ensure from/to is a valid reference type cg.EmitCastClass(to); } else if (conversion.IsUserDefined) { var method = (MethodSymbol)conversion.MethodSymbol; var ps = method.Parameters; int pconsumed = 0; if (method.HasThis) { if (from.IsValueType) { if (op != null || from.IsVoid()) { throw new ArgumentException(nameof(op)); } cg.EmitStructAddr(from); } } else { if (ps[0].RefKind != RefKind.None) { throw new InvalidOperationException(); } if (from != ps[0].Type) { if (op != null) { if (!ps[0].Type.IsAssignableFrom(from)) { throw new ArgumentException(nameof(op)); } } else { EmitImplicitConversion(cg, from, ps[0].Type, @checked: @checked); } } pconsumed++; } if (op != null) { if (ps.Length > pconsumed) { EmitImplicitConversion(cg, op, ps[pconsumed].Type, @checked: @checked); } pconsumed++; } // Context ctx, if (ps.Length > pconsumed && SpecialParameterSymbol.IsContextParameter(ps[pconsumed])) { cg.EmitLoadContext(); pconsumed++; } if (ps.Length != pconsumed) { throw new InvalidOperationException(); } EmitImplicitConversion(cg, cg.EmitCall(method.IsVirtual ? ILOpCode.Callvirt : ILOpCode.Call, method), to, @checked: true); } else { throw new NotImplementedException(); } }
void EmitInit(Emit.PEModuleBuilder module, DiagnosticBag diagnostic, PhpCompilation compilation, SynthesizedStaticLocHolder holder, BoundExpression initializer) { var loctype = holder.ValueField.Type; bool requiresContext = initializer != null && initializer.RequiresContext; if (requiresContext) { // emit Init only if it needs Context holder.EmitInit(module, (il) => { var cg = new CodeGenerator(il, module, diagnostic, OptimizationLevel.Release, false, holder.ContainingType, new ArgPlace(compilation.CoreTypes.Context, 1), new ArgPlace(holder, 0)); var valuePlace = new FieldPlace(cg.ThisPlaceOpt, holder.ValueField); // Template: this.value = <initilizer>; valuePlace.EmitStorePrepare(il); cg.EmitConvert(initializer, valuePlace.TypeOpt); valuePlace.EmitStore(il); // il.EmitRet(true); }); } // default .ctor holder.EmitCtor(module, (il) => { if (!requiresContext) { // emit default value only if it won't be initialized by Init above var cg = new CodeGenerator(il, module, diagnostic, OptimizationLevel.Release, false, holder.ContainingType, null, new ArgPlace(holder, 0)); var valuePlace = new FieldPlace(cg.ThisPlaceOpt, holder.ValueField); // Template: this.value = default(T); valuePlace.EmitStorePrepare(il); if (initializer != null) { cg.EmitConvert(initializer, valuePlace.TypeOpt); } else { cg.EmitLoadDefault(valuePlace.TypeOpt, 0); } valuePlace.EmitStore(il); } // il.EmitRet(true); }); }