EmitLoadDefaultOfValueType() публичный Метод

Emits default(valuetype). Handles special types with a default ctor.
public EmitLoadDefaultOfValueType ( TypeSymbol valuetype ) : void
valuetype TypeSymbol
Результат void
Пример #1
0
        public void EmitStore(CodeGenerator cg, TypeSymbol valueType)
        {
            var type = _place.TypeOpt;

            // Write Ref
            if (_access.IsWriteRef)
            {
                if (valueType != cg.CoreTypes.PhpAlias)
                {
                    Debug.Assert(false, "caller should get aliased value");
                    cg.EmitConvertToPhpValue(valueType, 0);
                    valueType = cg.Emit_PhpValue_MakeAlias();
                }

                //
                if (type == cg.CoreTypes.PhpAlias)
                {
                    // <place> = <alias>
                    _place.EmitStore(cg.Builder);
                }
                else if (type == cg.CoreTypes.PhpValue)
                {
                    // <place> = PhpValue.Create(<alias>)
                    cg.EmitCall(ILOpCode.Call, cg.CoreMethods.PhpValue.Create_PhpAlias);
                    _place.EmitStore(cg.Builder);
                }
                else
                {
                    Debug.Assert(false, "Assigning alias to non-aliasable variable.");
                    cg.EmitConvert(valueType, 0, type);
                    _place.EmitStore(cg.Builder);
                }
            }
            else if (_access.IsUnset)
            {
                Debug.Assert(valueType == null);

                // <place> =

                if (type == cg.CoreTypes.PhpAlias)
                {
                    // new PhpAlias(void)
                    cg.Emit_PhpValue_Void();
                    cg.Emit_PhpValue_MakeAlias();
                }
                else if (type.IsReferenceType)
                {
                    // null
                    cg.Builder.EmitNullConstant();
                }
                else
                {
                    // default(T)
                    cg.EmitLoadDefaultOfValueType(type);
                }

                _place.EmitStore(cg.Builder);
            }
            else
            {
                //
                if (type == cg.CoreTypes.PhpAlias)
                {
                    // <place>.Value = <value>
                    cg.EmitConvertToPhpValue(valueType, 0);
                    cg.Emit_PhpAlias_SetValue();
                }
                else if (type == cg.CoreTypes.PhpValue)
                {
                    if (_thint.IsRef)
                    {
                        // Operators.SetValue(ref <place>, (PhpValue)<value>);
                        cg.EmitConvertToPhpValue(valueType, 0);
                        cg.EmitCall(ILOpCode.Call, cg.CoreMethods.Operators.SetValue_PhpValueRef_PhpValue);
                    }
                    else
                    {
                        // <place> = <value>
                        cg.EmitConvertToPhpValue(valueType, 0);
                        _place.EmitStore(cg.Builder);
                    }
                }
                else
                {
                    cg.EmitConvert(valueType, 0, type);
                    _place.EmitStore(cg.Builder);
                }
            }
        }