478private const BindValueKind ValueKindSignificantBitsMask = unchecked((BindValueKind)~((1 << ValueKindInsignificantBits) - 1)); 575private static bool RequiresRValueOnly(BindValueKind kind) 577return (kind & ValueKindSignificantBitsMask) == BindValueKind.RValue; 580private static bool RequiresAssignmentOnly(BindValueKind kind) 582return (kind & ValueKindSignificantBitsMask) == BindValueKind.Assignable; 585private static bool RequiresVariable(BindValueKind kind) 590private static bool RequiresReferenceToLocation(BindValueKind kind) 592return (kind & BindValueKind.RefersToLocation) != 0; 595private static bool RequiresAssignableVariable(BindValueKind kind) 597return (kind & BindValueKind.Assignable) != 0; 600private static bool RequiresRefAssignableVariable(BindValueKind kind) 602return (kind & BindValueKind.RefAssignable) != 0; 605private static bool RequiresRefOrOut(BindValueKind kind) 607return (kind & BindValueKind.RefOrOut) == BindValueKind.RefOrOut; 612private static AccessorKind GetIndexerAccessorKind(BoundIndexerAccess indexerAccess, BindValueKind valueKind) 622private static AccessorKind GetAccessorKind(BindValueKind valueKind) 624var coreValueKind = valueKind & ValueKindSignificantBitsMask; 627BindValueKind.CompoundAssignment => AccessorKind.Both, 628BindValueKind.Assignable => AccessorKind.Set, 633private BoundIndexerAccess BindIndexerDefaultArgumentsAndParamsCollection(BoundIndexerAccess indexerAccess, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 635var coreValueKind = valueKind & ValueKindSignificantBitsMask; 637var useSetAccessor = coreValueKind == BindValueKind.Assignable && indexerAccess.Indexer.RefKind != RefKind.Ref; 734private BoundExpression CheckValue(BoundExpression expr, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 749Debug.Assert(expr.Syntax.Kind() != SyntaxKind.Argument || valueKind == BindValueKind.RefOrOut); 754Debug.Assert(valueKind == BindValueKind.RefOrOut); 758Debug.Assert(valueKind is (BindValueKind.Assignable or BindValueKind.RefOrOut or BindValueKind.RefAssignable) || diagnostics.DiagnosticBag is null || diagnostics.HasAnyResolvedErrors()); 826if (valueKind == BindValueKind.RValue) 833if ((valueKind & BindValueKind.RefersToLocation) == BindValueKind.RefersToLocation) 841if ((valueKind & BindValueKind.RefersToLocation) == BindValueKind.RefersToLocation) 855if (expr.Kind == BoundKind.MethodGroup && valueKind != BindValueKind.RValueOrMethodGroup) 905expr.HasAnyErrors && valueKind == BindValueKind.RValueOrMethodGroup) 910var resultKind = (valueKind == BindValueKind.RValue || valueKind == BindValueKind.RValueOrMethodGroup) ? 942internal bool CheckValueKind(SyntaxNode node, BoundExpression expr, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1000case BoundKind.MethodGroup when valueKind == BindValueKind.AddressOf: 1223bool checkArrayAccessValueKind(SyntaxNode node, BindValueKind valueKind, ImmutableArray<BoundExpression> indices, BindingDiagnosticBag diagnostics) 1245private static void ReportThisLvalueError(SyntaxNode node, BindValueKind valueKind, bool isValueType, bool isPrimaryConstructorParameter, BindingDiagnosticBag diagnostics) 1300private void CheckAddressOfInAsyncOrIteratorMethod(SyntaxNode node, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1302if (valueKind == BindValueKind.AddressOf) 1315private bool CheckLocalValueKind(SyntaxNode node, BoundLocal local, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1405private bool CheckParameterValueKind(SyntaxNode node, BoundParameter parameter, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1407Debug.Assert(!RequiresAssignableVariable(BindValueKind.AddressOf)); 1468static void reportReadOnlyParameterError(ParameterSymbol parameterSymbol, SyntaxNode node, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1472Debug.Assert(valueKind != BindValueKind.AddressOf); // If this assert fails, we probably should report ErrorCode.ERR_InvalidAddrOp 1478if (valueKind == BindValueKind.RefReturn) 1497if (valueKind == BindValueKind.RefReturn) 1613private bool CheckFieldValueKind(SyntaxNode node, BoundFieldAccess fieldAccess, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1658Debug.Assert(valueKind == BindValueKind.RefAssignable); 1675return CheckIsValidReceiverForVariable(node, fieldAccess.ReceiverOpt, BindValueKind.Assignable, diagnostics); 1761private bool CheckSimpleAssignmentValueKind(SyntaxNode node, BoundAssignmentOperator assignment, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1840private bool CheckEventValueKind(BoundEventAccess boundEvent, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1851if (valueKind == BindValueKind.CompoundAssignment) 1880if (!CheckIsValidReceiverForVariable(eventSyntax, receiver, BindValueKind.Assignable, diagnostics)) 1887if (eventSymbol.IsWindowsRuntimeEvent && valueKind != BindValueKind.Assignable) 1891if (valueKind == BindValueKind.RefOrOut) 1912private bool CheckIsValidReceiverForVariable(SyntaxNode node, BoundExpression receiver, BindValueKind kind, BindingDiagnosticBag diagnostics) 1942BindValueKind valueKind, 1983private bool CheckPropertyValueKind(SyntaxNode node, BoundExpression expr, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 2010else if (valueKind == BindValueKind.RefOrOut) 2082var setValueKind = setMethod.IsEffectivelyReadOnly ? BindValueKind.RValue : BindValueKind.Assignable; 3456private static void ReportReadonlyLocalError(SyntaxNode node, LocalSymbol local, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3459Debug.Assert(kind != BindValueKind.RValue); 3494private static ErrorCode GetThisLvalueError(BindValueKind kind, bool isValueType, bool isPrimaryConstructorParameter) 3498case BindValueKind.CompoundAssignment: 3499case BindValueKind.Assignable: 3502case BindValueKind.RefOrOut: 3505case BindValueKind.AddressOf: 3508case BindValueKind.IncrementDecrement: 3511case BindValueKind.RefReturn: 3512case BindValueKind.ReadonlyRef: 3515case BindValueKind.RefAssignable: 3527private static ErrorCode GetRangeLvalueError(BindValueKind kind) 3531case BindValueKind.Assignable: 3532case BindValueKind.CompoundAssignment: 3533case BindValueKind.IncrementDecrement: 3536case BindValueKind.AddressOf: 3539case BindValueKind.RefReturn: 3540case BindValueKind.ReadonlyRef: 3543case BindValueKind.RefAssignable: 3555private static ErrorCode GetMethodGroupOrFunctionPointerLvalueError(BindValueKind valueKind) 3566private static ErrorCode GetStandardLvalueError(BindValueKind kind) 3570case BindValueKind.CompoundAssignment: 3571case BindValueKind.Assignable: 3574case BindValueKind.AddressOf: 3577case BindValueKind.IncrementDecrement: 3580case BindValueKind.FixedReceiver: 3583case BindValueKind.RefReturn: 3584case BindValueKind.ReadonlyRef: 3587case BindValueKind.RefAssignable: 3615private static void ReportReadOnlyFieldError(FieldSymbol field, SyntaxNode node, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3623Debug.Assert(kind != BindValueKind.AddressOf); // If this assert fails, we probably should report ErrorCode.ERR_InvalidAddrOp 3640int index = (checkingReceiver ? 6 : 0) + (field.IsStatic ? 3 : 0) + (kind == BindValueKind.RefReturn ? 0 : (RequiresRefOrOut(kind) ? 1 : 2)); 3651private static void ReportReadOnlyError(Symbol symbol, SyntaxNode node, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3658if (kind == BindValueKind.AddressOf) 3676int index = (checkingReceiver ? 3 : 0) + (kind == BindValueKind.RefReturn ? 0 : (RequiresRefOrOut(kind) ? 1 : 2));

569BoundExpression namedArgumentValue = this.BindValue(namedArgument.Expression, diagnostics, BindValueKind.RValue);

648qualified = CheckValue(qualified, BindValueKind.RValue, diagnostics);

476if (CheckValueKind(syntax, source, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 491if (CheckValueKind(syntax, source, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded))

99BoundExpression boundRight = rightPlaceholder ?? BindValue(right, deconstructionDiagnostics, BindValueKind.RValue); 660memberAccess = CheckValue(memberAccess, BindValueKind.RValueOrMethodGroup, diagnostics); 794var checkedVariable = CheckValue(boundVariable, BindValueKind.Assignable, diagnostics);

260internal BoundExpression BindValue(ExpressionSyntax node, BindingDiagnosticBag diagnostics, BindValueKind valueKind) 268return BindToNaturalType(BindValue(node, diagnostics, BindValueKind.RValue), diagnostics, reportNoTargetType); 285return CheckValue(valueOrType, BindValueKind.RValue, diagnostics); 467internal BoundExpression BindValueAllowArgList(ExpressionSyntax node, BindingDiagnosticBag diagnostics, BindValueKind valueKind) 512BindValueKind valueKind; 545valueBeforeConversion = defaultValueBinder.BindValue(defaultValueSyntax.Value, diagnostics, BindValueKind.RValue); 563var initializer = initializerBinder.BindValue(equalsValueSyntax.Value, diagnostics, BindValueKind.RValue); 893node, LookupResultKind.Empty, ImmutableArray<Symbol>.Empty, ImmutableArray.Create<BoundExpression>(BindToTypeForErrorRecovery(BindValue(node.Expression, BindingDiagnosticBag.Discarded, BindValueKind.RefersToLocation))), 1045ImmutableArray.Create(BindValue(arguments[0].Expression, diagnostics, BindValueKind.RValue)) : 1075BoundExpression boundArgument = BindValue(argumentSyntax.Expression, diagnostics, BindValueKind.RValue); 1256BoundExpression argument = BindValue(node.Expression, diagnostics, BindValueKind.RValue); 1279BoundExpression argument = this.BindValue(node.Expression, diagnostics, BindValueKind.RefOrOut); 1304BoundExpression argument = BindValue(node.Expression, diagnostics, BindValueKind.RValue); 2660BoundExpression operand = this.BindValue(node.Expression, diagnostics, BindValueKind.RValue); 2685BoundExpression boundOperand = BindValue(node.Operand, diagnostics, BindValueKind.RValue); 2793BoundExpression boundOperand = BindValue(operand, diagnostics, BindValueKind.RValue); 3196var requiredValueKind = origRefKind == RefKind.In ? BindValueKind.ReadonlyRef : BindValueKind.RefOrOut; 3477BindValueKind valueKind = 3479BindValueKind.RValue : 3481BindValueKind.ReadonlyRef : 3482BindValueKind.RefOrOut; 4015if (!this.CheckValueKind(argument.Syntax, argument, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 4027if (this.CheckValueKind(argument.Syntax, argument, BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 4180var size = BindValue(dimension, diagnostics, BindValueKind.RValue); 4296var boundExpression = BindValue(expression, diagnostics, BindValueKind.RValue); 4313var boundExpression = BindValue(expression, diagnostics, BindValueKind.RValue); 4642count = BindValue(countSyntax, diagnostics, BindValueKind.RValue); 5373ExpressionElementSyntax expressionElementSyntax => @this.BindValue(expressionElementSyntax.Expression, diagnostics, BindValueKind.RValue), 5814BindValueKind rhsValueKind, 5826Debug.Assert(rhsValueKind == BindValueKind.RValue); 5914var rhsKind = isRef ? GetRequiredRHSValueKindForRefAssignment(boundLeft) : BindValueKind.RValue; 5962var boundExpression = BindValue(memberInitializer, diagnostics, BindValueKind.RValue); 5977BindValueKind valueKind = isRhsNestedInitializer ? BindValueKind.RValue : (isRef ? BindValueKind.RefAssignable : BindValueKind.Assignable); 5990leftSyntax, implicitReceiver, BindValueKind.Assignable, false, diagnostics); 5997BindValueKind valueKind, 6238BindValueKind valueKind, 6272return ToBadExpression(boundMember, (valueKind == BindValueKind.RValue) ? LookupResultKind.NotAValue : LookupResultKind.NotAVariable); 6527var boundElementInitializer = BindInitializerExpressionOrValue(elementInitializer, initializerType, BindValueKind.RValue, implicitReceiver.Syntax, diagnostics); 6556exprBuilder.Add(BindValue(childElementInitializer, diagnostics, BindValueKind.RValue)); 7914boundLeft = CheckValue(boundLeft, BindValueKind.RValue, diagnostics); 8024boundLeft = CheckValue(boundLeft, BindValueKind.RValue, diagnostics); 9188hasError = !CheckValueKind(node, receiver, BindValueKind.FixedReceiver, checkingReceiver: false, diagnostics: diagnostics); 9639receiver = CheckValue(receiver, BindValueKind.RValue, diagnostics); 9769if (CheckValueKind(node, expr, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 9781if (!CheckValueKind(node, expr, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 10809lengthOrCountAccess = CheckValue(lengthOrCountAccess, BindValueKind.RValue, diagnostics); 11644var access = conditionalAccessBinder.BindValue(node.WhenNotNull, diagnostics, BindValueKind.RValue);

90var value = BindValue(interpolation.Expression, diagnostics, BindValueKind.RValue); 101alignment = GenerateConversionForAssignment(intType, BindValue(interpolation.AlignmentClause.Value, diagnostics, Binder.BindValueKind.RValue), diagnostics);

126boundExpression = CheckValue(boundExpression, BindValueKind.RValueOrMethodGroup, diagnostics); 246boundExpression = CheckValue(boundExpression, BindValueKind.RValueOrMethodGroup, diagnostics); 737extensionMemberAccess = CheckValue(extensionMemberAccess, BindValueKind.RValue, diagnostics); 1275receiverArgument = CheckValue(receiverArgument, BindValueKind.RefOrOut, diagnostics); 1379receiver = CheckValue(receiver, BindValueKind.RefOrOut, diagnostics); 1406var valueKind = method.IsEffectivelyReadOnly 1407? BindValueKind.RefersToLocation 1408: BindValueKind.RefersToLocation | BindValueKind.Assignable; 1987return CheckValue(boundValue, BindValueKind.RValue, diagnostics); 2429boundArgument = CheckValue(boundArgument, BindValueKind.RValue, diagnostics);

37BoundExpression right = BindValue(node.Right, diagnostics, BindValueKind.RValue); 111if (left.Kind == BoundKind.EventAccess && !CheckEventValueKind((BoundEventAccess)left, BindValueKind.Assignable, diagnostics)) 353if (!CheckValueKind(node, left, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 925BindValueKind bindValueKind = GetBinaryAssignmentKind(syntaxNode.Kind()); 927BoundExpression right = BindValue(syntaxNode.Right, diagnostics, BindValueKind.RValue); 3251BoundExpression operand = BindToNaturalType(BindValue(operandSyntax, diagnostics, BindValueKind.IncrementDecrement), diagnostics); 3446!CheckValueKind(node, operand, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 4110BoundExpression operand = BindToNaturalType(BindValue(node.Operand, diagnostics, BindValueKind.AddressOf), diagnostics); 4197bool receiverIsLValue = CheckValueKind(receiver.Syntax, receiver, BindValueKind.AddressOf, checkingReceiver: false, diagnostics: BindingDiagnosticBag.Discarded); 4627private static BindValueKind GetBinaryAssignmentKind(SyntaxKind kind) 4632return BindValueKind.Assignable; 4645return BindValueKind.CompoundAssignment; 4647return BindValueKind.RValue; 4651private static BindValueKind GetUnaryAssignmentKind(SyntaxKind kind) 4659return BindValueKind.IncrementDecrement; 4664return BindValueKind.RValue; 5585var leftOperand = BindValue(node.Left, diagnostics, BindValueKind.RValue); 5587var rightOperand = BindValue(node.Right, diagnostics, BindValueKind.RValue); 5774BoundExpression leftOperand = BindValue(node.Left, diagnostics, BindValueKind.CompoundAssignment); 5776BoundExpression rightOperand = BindValue(node.Right, diagnostics, BindValueKind.RValue); 5901BoundExpression trueExpr = BindValue(whenTrue, diagnostics, BindValueKind.RValue); 5902BoundExpression falseExpr = BindValue(whenFalse, diagnostics, BindValueKind.RValue); 5942BoundExpression trueExpr = BindValue(whenTrue, diagnostics, BindValueKind.RValue | BindValueKind.RefersToLocation); 5943BoundExpression falseExpr = BindValue(whenFalse, diagnostics, BindValueKind.RValue | BindValueKind.RefersToLocation);

251indexerAccess = CheckValue(indexerAccess, BindValueKind.RValue, diagnostics); 400indexerAccess = CheckValue(indexerAccess, BindValueKind.RValue, diagnostics); 548expression = CheckValue(expression, BindValueKind.RValue, diagnostics); 1604boundMember = CheckValue(boundMember, BindValueKind.RValue, diagnostics); 1617if (!hasErrors && !CheckValueKind(node: memberName.Parent, expr: boundMember, valueKind: BindValueKind.RValue,

842BoundExpression boundExpression = lambdaBodyBinder.BindValue(expression, diagnostics, BindValueKind.RValue); 852BoundExpression boundExpression = lambdaBodyBinder.BindValue(expression, diagnostics, BindValueKind.RValue); 990var checkedUltimateReceiver = CheckValue(ultimateReceiver, BindValueKind.RValue, diagnostics);

240: BindValue(node.Expression, diagnostics, BindValueKind.RValue); 395var boundExpr = BindValue(exprSyntax, diagnostics, BindValueKind.RValue); 871BindValueKind valueKind; 878protected BoundExpression BindInferredVariableInitializer(BindingDiagnosticBag diagnostics, ExpressionSyntax initializer, BindValueKind valueKind, CSharpSyntaxNode errorSyntax) 919out BindValueKind valueKind, 926valueKind = BindValueKind.RValue; 936? BindValueKind.ReadonlyRef 937: BindValueKind.RefOrOut; 1012BindValueKind valueKind; 1423var lhsKind = isRef ? BindValueKind.RefAssignable : BindValueKind.Assignable; 1431var rhsKind = isRef ? GetRequiredRHSValueKindForRefAssignment(op1) : BindValueKind.RValue; 1444private static BindValueKind GetRequiredRHSValueKindForRefAssignment(BoundExpression boundLeft) 1446var rhsKind = BindValueKind.RefersToLocation; 1456rhsKind |= BindValueKind.Assignable; 1868BindValueKind valueKind, 2685var expr = BindValue(node, diagnostics, BindValueKind.RValue); 3043BindValueKind requiredValueKind = GetRequiredReturnValueKind(refKind); 3642BindValueKind requiredValueKind = bodyBinder.GetRequiredReturnValueKind(refKind); 3658BindValueKind requiredValueKind = GetRequiredReturnValueKind(refKind); 3672private BindValueKind GetRequiredReturnValueKind(RefKind refKind) 3674BindValueKind requiredValueKind = BindValueKind.RValue; 3679BindValueKind.RefReturn : 3680BindValueKind.ReadonlyRef;

343BindValueKind requiredCurrentKind; 347requiredCurrentKind = BindValueKind.RValue; 350requiredCurrentKind = BindValueKind.Assignable | BindValueKind.RefersToLocation; 353requiredCurrentKind = BindValueKind.RefersToLocation; 631BoundExpression collectionExpr = this.GetBinder(collectionSyntax).BindValue(collectionSyntax, diagnostics, BindValueKind.RValue); 843if (CheckValueKind(collectionExpr.Syntax, collectionExpr, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 851if (!CheckValueKind(collectionExpr.Syntax, collectionExpr, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded))

84BoundExpression boundExpression = originalBinder.BindValue(TargetExpressionSyntax, expressionDiagnostics, Binder.BindValueKind.RValueOrMethodGroup);

512gotoCaseExpressionOpt = gotoBinder.BindValue(node.Expression, diagnostics, BindValueKind.RValue);

46BoundExpression armResult = armBinder.BindValue(node.Expression, diagnostics, BindValueKind.RValue);

93binder.BindValue(sizeExpression, diagnostics, Binder.BindValueKind.RValue),