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; 732private BoundExpression CheckValue(BoundExpression expr, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 747Debug.Assert(expr.Syntax.Kind() != SyntaxKind.Argument || valueKind == BindValueKind.RefOrOut); 752Debug.Assert(valueKind == BindValueKind.RefOrOut); 756Debug.Assert(valueKind is (BindValueKind.Assignable or BindValueKind.RefOrOut or BindValueKind.RefAssignable) || diagnostics.DiagnosticBag is null || diagnostics.HasAnyResolvedErrors()); 806if (valueKind == BindValueKind.RValue) 813if ((valueKind & BindValueKind.RefersToLocation) == BindValueKind.RefersToLocation) 821if ((valueKind & BindValueKind.RefersToLocation) == BindValueKind.RefersToLocation) 835if (expr.Kind == BoundKind.MethodGroup && valueKind != BindValueKind.RValueOrMethodGroup) 884expr.HasAnyErrors && valueKind == BindValueKind.RValueOrMethodGroup) 889var resultKind = (valueKind == BindValueKind.RValue || valueKind == BindValueKind.RValueOrMethodGroup) ? 921internal bool CheckValueKind(SyntaxNode node, BoundExpression expr, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 979case BoundKind.MethodGroup when valueKind == BindValueKind.AddressOf: 1201bool checkArrayAccessValueKind(SyntaxNode node, BindValueKind valueKind, ImmutableArray<BoundExpression> indices, BindingDiagnosticBag diagnostics) 1223private static void ReportThisLvalueError(SyntaxNode node, BindValueKind valueKind, bool isValueType, bool isPrimaryConstructorParameter, BindingDiagnosticBag diagnostics) 1251private void CheckAddressOfInAsyncOrIteratorMethod(SyntaxNode node, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1253if (valueKind == BindValueKind.AddressOf) 1266private bool CheckLocalValueKind(SyntaxNode node, BoundLocal local, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1356private bool CheckParameterValueKind(SyntaxNode node, BoundParameter parameter, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1358Debug.Assert(!RequiresAssignableVariable(BindValueKind.AddressOf)); 1419static void reportReadOnlyParameterError(ParameterSymbol parameterSymbol, SyntaxNode node, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1423Debug.Assert(valueKind != BindValueKind.AddressOf); // If this assert fails, we probably should report ErrorCode.ERR_InvalidAddrOp 1429if (valueKind == BindValueKind.RefReturn) 1448if (valueKind == BindValueKind.RefReturn) 1564private bool CheckFieldValueKind(SyntaxNode node, BoundFieldAccess fieldAccess, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1609Debug.Assert(valueKind == BindValueKind.RefAssignable); 1626return CheckIsValidReceiverForVariable(node, fieldAccess.ReceiverOpt, BindValueKind.Assignable, diagnostics); 1712private bool CheckSimpleAssignmentValueKind(SyntaxNode node, BoundAssignmentOperator assignment, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1791private bool CheckEventValueKind(BoundEventAccess boundEvent, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1802if (valueKind == BindValueKind.CompoundAssignment) 1828if (!CheckIsValidReceiverForVariable(eventSyntax, receiver, BindValueKind.Assignable, diagnostics)) 1835if (eventSymbol.IsWindowsRuntimeEvent && valueKind != BindValueKind.Assignable) 1839if (valueKind == BindValueKind.RefOrOut) 1860private bool CheckIsValidReceiverForVariable(SyntaxNode node, BoundExpression receiver, BindValueKind kind, BindingDiagnosticBag diagnostics) 1890BindValueKind valueKind, 1931private bool CheckPropertyValueKind(SyntaxNode node, BoundExpression expr, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1958else if (valueKind == BindValueKind.RefOrOut) 2029var setValueKind = setMethod.IsEffectivelyReadOnly ? BindValueKind.RValue : BindValueKind.Assignable; 3406private static void ReportReadonlyLocalError(SyntaxNode node, LocalSymbol local, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3409Debug.Assert(kind != BindValueKind.RValue); 3444private static ErrorCode GetThisLvalueError(BindValueKind kind, bool isValueType, bool isPrimaryConstructorParameter) 3448case BindValueKind.CompoundAssignment: 3449case BindValueKind.Assignable: 3452case BindValueKind.RefOrOut: 3455case BindValueKind.AddressOf: 3458case BindValueKind.IncrementDecrement: 3461case BindValueKind.RefReturn: 3462case BindValueKind.ReadonlyRef: 3465case BindValueKind.RefAssignable: 3477private static ErrorCode GetRangeLvalueError(BindValueKind kind) 3481case BindValueKind.Assignable: 3482case BindValueKind.CompoundAssignment: 3483case BindValueKind.IncrementDecrement: 3486case BindValueKind.AddressOf: 3489case BindValueKind.RefReturn: 3490case BindValueKind.ReadonlyRef: 3493case BindValueKind.RefAssignable: 3505private static ErrorCode GetMethodGroupOrFunctionPointerLvalueError(BindValueKind valueKind) 3516private static ErrorCode GetStandardLvalueError(BindValueKind kind) 3520case BindValueKind.CompoundAssignment: 3521case BindValueKind.Assignable: 3524case BindValueKind.AddressOf: 3527case BindValueKind.IncrementDecrement: 3530case BindValueKind.FixedReceiver: 3533case BindValueKind.RefReturn: 3534case BindValueKind.ReadonlyRef: 3537case BindValueKind.RefAssignable: 3565private static void ReportReadOnlyFieldError(FieldSymbol field, SyntaxNode node, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3573Debug.Assert(kind != BindValueKind.AddressOf); // If this assert fails, we probably should report ErrorCode.ERR_InvalidAddrOp 3590int index = (checkingReceiver ? 6 : 0) + (field.IsStatic ? 3 : 0) + (kind == BindValueKind.RefReturn ? 0 : (RequiresRefOrOut(kind) ? 1 : 2)); 3601private static void ReportReadOnlyError(Symbol symbol, SyntaxNode node, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3608if (kind == BindValueKind.AddressOf) 3626int index = (checkingReceiver ? 3 : 0) + (kind == BindValueKind.RefReturn ? 0 : (RequiresRefOrOut(kind) ? 1 : 2));

561BoundExpression 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);

241internal BoundExpression BindValue(ExpressionSyntax node, BindingDiagnosticBag diagnostics, BindValueKind valueKind) 249return BindToNaturalType(BindValue(node, diagnostics, BindValueKind.RValue), diagnostics, reportNoTargetType); 266return CheckValue(valueOrType, BindValueKind.RValue, diagnostics); 435internal BoundExpression BindValueAllowArgList(ExpressionSyntax node, BindingDiagnosticBag diagnostics, BindValueKind valueKind) 480BindValueKind valueKind; 513valueBeforeConversion = defaultValueBinder.BindValue(defaultValueSyntax.Value, diagnostics, BindValueKind.RValue); 531var initializer = initializerBinder.BindValue(equalsValueSyntax.Value, diagnostics, BindValueKind.RValue); 861node, LookupResultKind.Empty, ImmutableArray<Symbol>.Empty, ImmutableArray.Create<BoundExpression>(BindToTypeForErrorRecovery(BindValue(node.Expression, BindingDiagnosticBag.Discarded, BindValueKind.RefersToLocation))), 1013ImmutableArray.Create(BindValue(arguments[0].Expression, diagnostics, BindValueKind.RValue)) : 1043BoundExpression boundArgument = BindValue(argumentSyntax.Expression, diagnostics, BindValueKind.RValue); 1224BoundExpression argument = BindValue(node.Expression, diagnostics, BindValueKind.RValue); 1247BoundExpression argument = this.BindValue(node.Expression, diagnostics, BindValueKind.RefOrOut); 1272BoundExpression argument = BindValue(node.Expression, diagnostics, BindValueKind.RValue); 2586BoundExpression operand = this.BindValue(node.Expression, diagnostics, BindValueKind.RValue); 2611BoundExpression boundOperand = BindValue(node.Operand, diagnostics, BindValueKind.RValue); 2719BoundExpression boundOperand = BindValue(operand, diagnostics, BindValueKind.RValue); 3122var requiredValueKind = origRefKind == RefKind.In ? BindValueKind.ReadonlyRef : BindValueKind.RefOrOut; 3403BindValueKind valueKind = 3405BindValueKind.RValue : 3407BindValueKind.ReadonlyRef : 3408BindValueKind.RefOrOut; 3937if (!this.CheckValueKind(argument.Syntax, argument, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 3949if (this.CheckValueKind(argument.Syntax, argument, BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 4102var size = BindValue(dimension, diagnostics, BindValueKind.RValue); 4218var boundExpression = BindValue(expression, diagnostics, BindValueKind.RValue); 4235var boundExpression = BindValue(expression, diagnostics, BindValueKind.RValue); 4564count = BindValue(countSyntax, diagnostics, BindValueKind.RValue); 5277ExpressionElementSyntax expressionElementSyntax => @this.BindValue(expressionElementSyntax.Expression, diagnostics, BindValueKind.RValue), 5651BindValueKind rhsValueKind, 5663Debug.Assert(rhsValueKind == BindValueKind.RValue); 5751var rhsKind = isRef ? GetRequiredRHSValueKindForRefAssignment(boundLeft) : BindValueKind.RValue; 5799var boundExpression = BindValue(memberInitializer, diagnostics, BindValueKind.RValue); 5814BindValueKind valueKind = isRhsNestedInitializer ? BindValueKind.RValue : (isRef ? BindValueKind.RefAssignable : BindValueKind.Assignable); 5827leftSyntax, implicitReceiver, BindValueKind.Assignable, false, diagnostics); 5834BindValueKind valueKind, 6076BindValueKind valueKind, 6110return ToBadExpression(boundMember, (valueKind == BindValueKind.RValue) ? LookupResultKind.NotAValue : LookupResultKind.NotAVariable); 6365var boundElementInitializer = BindInitializerExpressionOrValue(elementInitializer, initializerType, BindValueKind.RValue, implicitReceiver.Syntax, diagnostics); 6394exprBuilder.Add(BindValue(childElementInitializer, diagnostics, BindValueKind.RValue)); 7682boundLeft = CheckValue(boundLeft, BindValueKind.RValue, diagnostics); 7792boundLeft = CheckValue(boundLeft, BindValueKind.RValue, diagnostics); 8915hasError = !CheckValueKind(node, receiver, BindValueKind.FixedReceiver, checkingReceiver: false, diagnostics: diagnostics); 9328receiver = CheckValue(receiver, BindValueKind.RValue, diagnostics); 9458if (CheckValueKind(node, expr, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 9470if (!CheckValueKind(node, expr, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 10496lengthOrCountAccess = CheckValue(lengthOrCountAccess, BindValueKind.RValue, diagnostics); 11329var 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);

125boundExpression = CheckValue(boundExpression, BindValueKind.RValueOrMethodGroup, diagnostics); 245boundExpression = CheckValue(boundExpression, BindValueKind.RValueOrMethodGroup, diagnostics); 736extensionMemberAccess = CheckValue(extensionMemberAccess, BindValueKind.RValue, diagnostics); 1275receiverArgument = CheckValue(receiverArgument, BindValueKind.RefOrOut, diagnostics); 1378receiver = CheckValue(receiver, BindValueKind.RefOrOut, diagnostics); 1405var valueKind = method.IsEffectivelyReadOnly 1406? BindValueKind.RefersToLocation 1407: BindValueKind.RefersToLocation | BindValueKind.Assignable; 1923return CheckValue(typeOrValue.Data.ValueExpression, BindValueKind.RValue, diagnostics); 2350boundArgument = 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)) 893BindValueKind bindValueKind = GetBinaryAssignmentKind(syntaxNode.Kind()); 895BoundExpression right = BindValue(syntaxNode.Right, diagnostics, BindValueKind.RValue); 3121BoundExpression operand = BindToNaturalType(BindValue(operandSyntax, diagnostics, BindValueKind.IncrementDecrement), diagnostics); 3312!CheckValueKind(node, operand, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 3939BoundExpression operand = BindToNaturalType(BindValue(node.Operand, diagnostics, BindValueKind.AddressOf), diagnostics); 4026bool receiverIsLValue = CheckValueKind(receiver.Syntax, receiver, BindValueKind.AddressOf, checkingReceiver: false, diagnostics: BindingDiagnosticBag.Discarded); 4451private static BindValueKind GetBinaryAssignmentKind(SyntaxKind kind) 4456return BindValueKind.Assignable; 4469return BindValueKind.CompoundAssignment; 4471return BindValueKind.RValue; 4475private static BindValueKind GetUnaryAssignmentKind(SyntaxKind kind) 4483return BindValueKind.IncrementDecrement; 4488return BindValueKind.RValue; 5409var leftOperand = BindValue(node.Left, diagnostics, BindValueKind.RValue); 5411var rightOperand = BindValue(node.Right, diagnostics, BindValueKind.RValue); 5598BoundExpression leftOperand = BindValue(node.Left, diagnostics, BindValueKind.CompoundAssignment); 5600BoundExpression rightOperand = BindValue(node.Right, diagnostics, BindValueKind.RValue); 5727BoundExpression trueExpr = BindValue(whenTrue, diagnostics, BindValueKind.RValue); 5728BoundExpression falseExpr = BindValue(whenFalse, diagnostics, BindValueKind.RValue); 5768BoundExpression trueExpr = BindValue(whenTrue, diagnostics, BindValueKind.RValue | BindValueKind.RefersToLocation); 5769BoundExpression falseExpr = BindValue(whenFalse, diagnostics, BindValueKind.RValue | BindValueKind.RefersToLocation);

240indexerAccess = CheckValue(indexerAccess, BindValueKind.RValue, diagnostics); 389indexerAccess = CheckValue(indexerAccess, BindValueKind.RValue, diagnostics); 537expression = CheckValue(expression, BindValueKind.RValue, diagnostics); 1589boundMember = CheckValue(boundMember, BindValueKind.RValue, diagnostics); 1602if (!hasErrors && !CheckValueKind(node: memberName.Parent, expr: boundMember, valueKind: BindValueKind.RValue,

837BoundExpression boundExpression = lambdaBodyBinder.BindValue(expression, diagnostics, BindValueKind.RValue); 847BoundExpression boundExpression = lambdaBodyBinder.BindValue(expression, diagnostics, BindValueKind.RValue); 985var 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; 626BoundExpression collectionExpr = this.GetBinder(collectionSyntax).BindValue(collectionSyntax, diagnostics, BindValueKind.RValue); 836if (CheckValueKind(collectionExpr.Syntax, collectionExpr, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 844if (!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),