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()); 808if (valueKind == BindValueKind.RValue) 815if ((valueKind & BindValueKind.RefersToLocation) == BindValueKind.RefersToLocation) 823if ((valueKind & BindValueKind.RefersToLocation) == BindValueKind.RefersToLocation) 837if (expr.Kind == BoundKind.MethodGroup && valueKind != BindValueKind.RValueOrMethodGroup) 886expr.HasAnyErrors && valueKind == BindValueKind.RValueOrMethodGroup) 891var resultKind = (valueKind == BindValueKind.RValue || valueKind == BindValueKind.RValueOrMethodGroup) ? 923internal bool CheckValueKind(SyntaxNode node, BoundExpression expr, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 981case BoundKind.MethodGroup when valueKind == BindValueKind.AddressOf: 1203bool checkArrayAccessValueKind(SyntaxNode node, BindValueKind valueKind, ImmutableArray<BoundExpression> indices, BindingDiagnosticBag diagnostics) 1225private static void ReportThisLvalueError(SyntaxNode node, BindValueKind valueKind, bool isValueType, bool isPrimaryConstructorParameter, BindingDiagnosticBag diagnostics) 1253private void CheckAddressOfInAsyncOrIteratorMethod(SyntaxNode node, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1255if (valueKind == BindValueKind.AddressOf) 1268private bool CheckLocalValueKind(SyntaxNode node, BoundLocal local, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1358private bool CheckParameterValueKind(SyntaxNode node, BoundParameter parameter, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1360Debug.Assert(!RequiresAssignableVariable(BindValueKind.AddressOf)); 1421static void reportReadOnlyParameterError(ParameterSymbol parameterSymbol, SyntaxNode node, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1425Debug.Assert(valueKind != BindValueKind.AddressOf); // If this assert fails, we probably should report ErrorCode.ERR_InvalidAddrOp 1431if (valueKind == BindValueKind.RefReturn) 1450if (valueKind == BindValueKind.RefReturn) 1566private bool CheckFieldValueKind(SyntaxNode node, BoundFieldAccess fieldAccess, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1611Debug.Assert(valueKind == BindValueKind.RefAssignable); 1628return CheckIsValidReceiverForVariable(node, fieldAccess.ReceiverOpt, BindValueKind.Assignable, diagnostics); 1714private bool CheckSimpleAssignmentValueKind(SyntaxNode node, BoundAssignmentOperator assignment, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1793private bool CheckEventValueKind(BoundEventAccess boundEvent, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1804if (valueKind == BindValueKind.CompoundAssignment) 1830if (!CheckIsValidReceiverForVariable(eventSyntax, receiver, BindValueKind.Assignable, diagnostics)) 1837if (eventSymbol.IsWindowsRuntimeEvent && valueKind != BindValueKind.Assignable) 1841if (valueKind == BindValueKind.RefOrOut) 1862private bool CheckIsValidReceiverForVariable(SyntaxNode node, BoundExpression receiver, BindValueKind kind, BindingDiagnosticBag diagnostics) 1892BindValueKind valueKind, 1933private bool CheckPropertyValueKind(SyntaxNode node, BoundExpression expr, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1960else if (valueKind == BindValueKind.RefOrOut) 2031var setValueKind = setMethod.IsEffectivelyReadOnly ? BindValueKind.RValue : BindValueKind.Assignable; 3414private static void ReportReadonlyLocalError(SyntaxNode node, LocalSymbol local, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3417Debug.Assert(kind != BindValueKind.RValue); 3452private static ErrorCode GetThisLvalueError(BindValueKind kind, bool isValueType, bool isPrimaryConstructorParameter) 3456case BindValueKind.CompoundAssignment: 3457case BindValueKind.Assignable: 3460case BindValueKind.RefOrOut: 3463case BindValueKind.AddressOf: 3466case BindValueKind.IncrementDecrement: 3469case BindValueKind.RefReturn: 3470case BindValueKind.ReadonlyRef: 3473case BindValueKind.RefAssignable: 3485private static ErrorCode GetRangeLvalueError(BindValueKind kind) 3489case BindValueKind.Assignable: 3490case BindValueKind.CompoundAssignment: 3491case BindValueKind.IncrementDecrement: 3494case BindValueKind.AddressOf: 3497case BindValueKind.RefReturn: 3498case BindValueKind.ReadonlyRef: 3501case BindValueKind.RefAssignable: 3513private static ErrorCode GetMethodGroupOrFunctionPointerLvalueError(BindValueKind valueKind) 3524private static ErrorCode GetStandardLvalueError(BindValueKind kind) 3528case BindValueKind.CompoundAssignment: 3529case BindValueKind.Assignable: 3532case BindValueKind.AddressOf: 3535case BindValueKind.IncrementDecrement: 3538case BindValueKind.FixedReceiver: 3541case BindValueKind.RefReturn: 3542case BindValueKind.ReadonlyRef: 3545case BindValueKind.RefAssignable: 3573private static void ReportReadOnlyFieldError(FieldSymbol field, SyntaxNode node, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3581Debug.Assert(kind != BindValueKind.AddressOf); // If this assert fails, we probably should report ErrorCode.ERR_InvalidAddrOp 3598int index = (checkingReceiver ? 6 : 0) + (field.IsStatic ? 3 : 0) + (kind == BindValueKind.RefReturn ? 0 : (RequiresRefOrOut(kind) ? 1 : 2)); 3609private static void ReportReadOnlyError(Symbol symbol, SyntaxNode node, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3616if (kind == BindValueKind.AddressOf) 3634int index = (checkingReceiver ? 3 : 0) + (kind == BindValueKind.RefReturn ? 0 : (RequiresRefOrOut(kind) ? 1 : 2));

563BoundExpression namedArgumentValue = this.BindValue(namedArgument.Expression, diagnostics, BindValueKind.RValue);

455if (CheckValueKind(syntax, source, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 470if (CheckValueKind(syntax, source, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded))

99BoundExpression boundRight = rightPlaceholder ?? BindValue(right, deconstructionDiagnostics, BindValueKind.RValue); 658memberAccess = CheckValue(memberAccess, BindValueKind.RValueOrMethodGroup, diagnostics); 792var checkedVariable = CheckValue(boundVariable, BindValueKind.Assignable, diagnostics);

242internal BoundExpression BindValue(ExpressionSyntax node, BindingDiagnosticBag diagnostics, BindValueKind valueKind) 250return BindToNaturalType(BindValue(node, diagnostics, BindValueKind.RValue), diagnostics, reportNoTargetType); 267return CheckValue(valueOrType, BindValueKind.RValue, diagnostics); 436internal BoundExpression BindValueAllowArgList(ExpressionSyntax node, BindingDiagnosticBag diagnostics, BindValueKind valueKind) 481BindValueKind valueKind; 514valueBeforeConversion = defaultValueBinder.BindValue(defaultValueSyntax.Value, diagnostics, BindValueKind.RValue); 532var initializer = initializerBinder.BindValue(equalsValueSyntax.Value, diagnostics, BindValueKind.RValue); 862node, LookupResultKind.Empty, ImmutableArray<Symbol>.Empty, ImmutableArray.Create<BoundExpression>(BindToTypeForErrorRecovery(BindValue(node.Expression, BindingDiagnosticBag.Discarded, BindValueKind.RefersToLocation))), 1014ImmutableArray.Create(BindValue(arguments[0].Expression, diagnostics, BindValueKind.RValue)) : 1044BoundExpression boundArgument = BindValue(argumentSyntax.Expression, diagnostics, BindValueKind.RValue); 1225BoundExpression argument = BindValue(node.Expression, diagnostics, BindValueKind.RValue); 1248BoundExpression argument = this.BindValue(node.Expression, diagnostics, BindValueKind.RefOrOut); 1273BoundExpression argument = BindValue(node.Expression, diagnostics, BindValueKind.RValue); 2609BoundExpression operand = this.BindValue(node.Expression, diagnostics, BindValueKind.RValue); 2634BoundExpression boundOperand = BindValue(node.Operand, diagnostics, BindValueKind.RValue); 2742BoundExpression boundOperand = BindValue(operand, diagnostics, BindValueKind.RValue); 3145var requiredValueKind = origRefKind == RefKind.In ? BindValueKind.ReadonlyRef : BindValueKind.RefOrOut; 3426BindValueKind valueKind = 3428BindValueKind.RValue : 3430BindValueKind.ReadonlyRef : 3431BindValueKind.RefOrOut; 3960if (!this.CheckValueKind(argument.Syntax, argument, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 3972if (this.CheckValueKind(argument.Syntax, argument, BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 4125var size = BindValue(dimension, diagnostics, BindValueKind.RValue); 4241var boundExpression = BindValue(expression, diagnostics, BindValueKind.RValue); 4258var boundExpression = BindValue(expression, diagnostics, BindValueKind.RValue); 4587count = BindValue(countSyntax, diagnostics, BindValueKind.RValue); 5301ExpressionElementSyntax expressionElementSyntax => @this.BindValue(expressionElementSyntax.Expression, diagnostics, BindValueKind.RValue), 5681BindValueKind rhsValueKind, 5693Debug.Assert(rhsValueKind == BindValueKind.RValue); 5781var rhsKind = isRef ? GetRequiredRHSValueKindForRefAssignment(boundLeft) : BindValueKind.RValue; 5829var boundExpression = BindValue(memberInitializer, diagnostics, BindValueKind.RValue); 5844BindValueKind valueKind = isRhsNestedInitializer ? BindValueKind.RValue : (isRef ? BindValueKind.RefAssignable : BindValueKind.Assignable); 5857leftSyntax, implicitReceiver, BindValueKind.Assignable, false, diagnostics); 5864BindValueKind valueKind, 6106BindValueKind valueKind, 6140return ToBadExpression(boundMember, (valueKind == BindValueKind.RValue) ? LookupResultKind.NotAValue : LookupResultKind.NotAVariable); 6395var boundElementInitializer = BindInitializerExpressionOrValue(elementInitializer, initializerType, BindValueKind.RValue, implicitReceiver.Syntax, diagnostics); 6424exprBuilder.Add(BindValue(childElementInitializer, diagnostics, BindValueKind.RValue)); 7713boundLeft = CheckValue(boundLeft, BindValueKind.RValue, diagnostics); 7823boundLeft = CheckValue(boundLeft, BindValueKind.RValue, diagnostics); 8946hasError = !CheckValueKind(node, receiver, BindValueKind.FixedReceiver, checkingReceiver: false, diagnostics: diagnostics); 9359receiver = CheckValue(receiver, BindValueKind.RValue, diagnostics); 9489if (CheckValueKind(node, expr, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 9501if (!CheckValueKind(node, expr, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 10527lengthOrCountAccess = CheckValue(lengthOrCountAccess, BindValueKind.RValue, diagnostics); 11362var 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); 1291receiverArgument = CheckValue(receiverArgument, BindValueKind.RefOrOut, diagnostics); 1394receiver = CheckValue(receiver, BindValueKind.RefOrOut, diagnostics); 1421var valueKind = method.IsEffectivelyReadOnly 1422? BindValueKind.RefersToLocation 1423: BindValueKind.RefersToLocation | BindValueKind.Assignable; 1993return CheckValue(typeOrValue.Data.ValueExpression, BindValueKind.RValue, diagnostics); 2420boundArgument = CheckValue(boundArgument, BindValueKind.RValue, diagnostics);

30BoundExpression right = BindValue(node.Right, diagnostics, BindValueKind.RValue); 104if (left.Kind == BoundKind.EventAccess && !CheckEventValueKind((BoundEventAccess)left, BindValueKind.Assignable, diagnostics)) 346if (!CheckValueKind(node, left, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 900BindValueKind bindValueKind = GetBinaryAssignmentKind(syntaxNode.Kind()); 902BoundExpression right = BindValue(syntaxNode.Right, diagnostics, BindValueKind.RValue); 3143BoundExpression operand = BindToNaturalType(BindValue(operandSyntax, diagnostics, BindValueKind.IncrementDecrement), diagnostics); 3334!CheckValueKind(node, operand, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 3971BoundExpression operand = BindToNaturalType(BindValue(node.Operand, diagnostics, BindValueKind.AddressOf), diagnostics); 4058bool receiverIsLValue = CheckValueKind(receiver.Syntax, receiver, BindValueKind.AddressOf, checkingReceiver: false, diagnostics: BindingDiagnosticBag.Discarded); 4483private static BindValueKind GetBinaryAssignmentKind(SyntaxKind kind) 4488return BindValueKind.Assignable; 4501return BindValueKind.CompoundAssignment; 4503return BindValueKind.RValue; 4507private static BindValueKind GetUnaryAssignmentKind(SyntaxKind kind) 4515return BindValueKind.IncrementDecrement; 4520return BindValueKind.RValue; 5441var leftOperand = BindValue(node.Left, diagnostics, BindValueKind.RValue); 5443var rightOperand = BindValue(node.Right, diagnostics, BindValueKind.RValue); 5630BoundExpression leftOperand = BindValue(node.Left, diagnostics, BindValueKind.CompoundAssignment); 5632BoundExpression rightOperand = BindValue(node.Right, diagnostics, BindValueKind.RValue); 5759BoundExpression trueExpr = BindValue(whenTrue, diagnostics, BindValueKind.RValue); 5760BoundExpression falseExpr = BindValue(whenFalse, diagnostics, BindValueKind.RValue); 5800BoundExpression trueExpr = BindValue(whenTrue, diagnostics, BindValueKind.RValue | BindValueKind.RefersToLocation); 5801BoundExpression 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); 1600boundMember = CheckValue(boundMember, BindValueKind.RValue, diagnostics); 1613if (!hasErrors && !CheckValueKind(node: memberName.Parent, expr: boundMember, valueKind: BindValueKind.RValue,

848BoundExpression boundExpression = lambdaBodyBinder.BindValue(expression, diagnostics, BindValueKind.RValue); 858BoundExpression boundExpression = lambdaBodyBinder.BindValue(expression, diagnostics, BindValueKind.RValue); 998var checkedUltimateReceiver = CheckValue(ultimateReceiver, BindValueKind.RValue, diagnostics);

240: BindValue(node.Expression, diagnostics, BindValueKind.RValue); 395var boundExpr = BindValue(exprSyntax, diagnostics, BindValueKind.RValue); 866BindValueKind valueKind; 873protected BoundExpression BindInferredVariableInitializer(BindingDiagnosticBag diagnostics, ExpressionSyntax initializer, BindValueKind valueKind, CSharpSyntaxNode errorSyntax) 914out BindValueKind valueKind, 921valueKind = BindValueKind.RValue; 931? BindValueKind.ReadonlyRef 932: BindValueKind.RefOrOut; 1007BindValueKind valueKind; 1417var lhsKind = isRef ? BindValueKind.RefAssignable : BindValueKind.Assignable; 1425var rhsKind = isRef ? GetRequiredRHSValueKindForRefAssignment(op1) : BindValueKind.RValue; 1438private static BindValueKind GetRequiredRHSValueKindForRefAssignment(BoundExpression boundLeft) 1440var rhsKind = BindValueKind.RefersToLocation; 1450rhsKind |= BindValueKind.Assignable; 1861BindValueKind valueKind, 2678var expr = BindValue(node, diagnostics, BindValueKind.RValue); 3031BindValueKind requiredValueKind = GetRequiredReturnValueKind(refKind); 3614BindValueKind requiredValueKind = bodyBinder.GetRequiredReturnValueKind(refKind); 3630BindValueKind requiredValueKind = GetRequiredReturnValueKind(refKind); 3644private BindValueKind GetRequiredReturnValueKind(RefKind refKind) 3646BindValueKind requiredValueKind = BindValueKind.RValue; 3651BindValueKind.RefReturn : 3652BindValueKind.ReadonlyRef;

343BindValueKind requiredCurrentKind; 347requiredCurrentKind = BindValueKind.RValue; 350requiredCurrentKind = BindValueKind.Assignable | BindValueKind.RefersToLocation; 353requiredCurrentKind = BindValueKind.RefersToLocation; 629BoundExpression collectionExpr = this.GetBinder(collectionSyntax).BindValue(collectionSyntax, diagnostics, BindValueKind.RValue); 839if (CheckValueKind(collectionExpr.Syntax, collectionExpr, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 847if (!CheckValueKind(collectionExpr.Syntax, collectionExpr, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded))

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

497gotoCaseExpressionOpt = gotoBinder.BindValue(node.Expression, diagnostics, BindValueKind.RValue);

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

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