479private const BindValueKind ValueKindSignificantBitsMask = unchecked((BindValueKind)~((1 << ValueKindInsignificantBits) - 1)); 576private static bool RequiresRValueOnly(BindValueKind kind) 578return (kind & ValueKindSignificantBitsMask) == BindValueKind.RValue; 581private static bool RequiresAssignmentOnly(BindValueKind kind) 583return (kind & ValueKindSignificantBitsMask) == BindValueKind.Assignable; 586private static bool RequiresVariable(BindValueKind kind) 591private static bool RequiresReferenceToLocation(BindValueKind kind) 593return (kind & BindValueKind.RefersToLocation) != 0; 596private static bool RequiresAssignableVariable(BindValueKind kind) 598return (kind & BindValueKind.Assignable) != 0; 601private static bool RequiresRefAssignableVariable(BindValueKind kind) 603return (kind & BindValueKind.RefAssignable) != 0; 606private static bool RequiresRefOrOut(BindValueKind kind) 608return (kind & BindValueKind.RefOrOut) == BindValueKind.RefOrOut; 613private static AccessorKind GetIndexerAccessorKind(BoundIndexerAccess indexerAccess, BindValueKind valueKind) 623private static AccessorKind GetAccessorKind(BindValueKind valueKind) 625var coreValueKind = valueKind & ValueKindSignificantBitsMask; 628BindValueKind.CompoundAssignment => AccessorKind.Both, 629BindValueKind.Assignable => AccessorKind.Set, 634private BoundIndexerAccess BindIndexerDefaultArgumentsAndParamsCollection(BoundIndexerAccess indexerAccess, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 636var coreValueKind = valueKind & ValueKindSignificantBitsMask; 638var useSetAccessor = coreValueKind == BindValueKind.Assignable && indexerAccess.Indexer.RefKind != RefKind.Ref; 735private BoundExpression CheckValue(BoundExpression expr, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 750Debug.Assert(expr.Syntax.Kind() != SyntaxKind.Argument || valueKind == BindValueKind.RefOrOut); 755Debug.Assert(valueKind == BindValueKind.RefOrOut); 759Debug.Assert(valueKind is (BindValueKind.Assignable or BindValueKind.RefOrOut or BindValueKind.RefAssignable) || diagnostics.DiagnosticBag is null || diagnostics.HasAnyResolvedErrors()); 827if (valueKind == BindValueKind.RValue) 834if ((valueKind & BindValueKind.RefersToLocation) == BindValueKind.RefersToLocation) 842if ((valueKind & BindValueKind.RefersToLocation) == BindValueKind.RefersToLocation) 856if (expr.Kind == BoundKind.MethodGroup && valueKind != BindValueKind.RValueOrMethodGroup) 906expr.HasAnyErrors && valueKind == BindValueKind.RValueOrMethodGroup) 911var resultKind = (valueKind == BindValueKind.RValue || valueKind == BindValueKind.RValueOrMethodGroup) ? 943internal bool CheckValueKind(SyntaxNode node, BoundExpression expr, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1001case BoundKind.MethodGroup when valueKind == BindValueKind.AddressOf: 1224bool checkArrayAccessValueKind(SyntaxNode node, BindValueKind valueKind, ImmutableArray<BoundExpression> indices, BindingDiagnosticBag diagnostics) 1246private static void ReportThisLvalueError(SyntaxNode node, BindValueKind valueKind, bool isValueType, bool isPrimaryConstructorParameter, BindingDiagnosticBag diagnostics) 1301private void CheckAddressOfInAsyncOrIteratorMethod(SyntaxNode node, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1303if (valueKind == BindValueKind.AddressOf) 1316private bool CheckLocalValueKind(SyntaxNode node, BoundLocal local, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1406private bool CheckParameterValueKind(SyntaxNode node, BoundParameter parameter, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1408Debug.Assert(!RequiresAssignableVariable(BindValueKind.AddressOf)); 1469static void reportReadOnlyParameterError(ParameterSymbol parameterSymbol, SyntaxNode node, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1473Debug.Assert(valueKind != BindValueKind.AddressOf); // If this assert fails, we probably should report ErrorCode.ERR_InvalidAddrOp 1479if (valueKind == BindValueKind.RefReturn) 1498if (valueKind == BindValueKind.RefReturn) 1614private bool CheckFieldValueKind(SyntaxNode node, BoundFieldAccess fieldAccess, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1659Debug.Assert(valueKind == BindValueKind.RefAssignable); 1676return CheckIsValidReceiverForVariable(node, fieldAccess.ReceiverOpt, BindValueKind.Assignable, diagnostics); 1762private bool CheckSimpleAssignmentValueKind(SyntaxNode node, BoundAssignmentOperator assignment, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1841private bool CheckEventValueKind(BoundEventAccess boundEvent, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1852if (valueKind == BindValueKind.CompoundAssignment) 1881if (!CheckIsValidReceiverForVariable(eventSyntax, receiver, BindValueKind.Assignable, diagnostics)) 1888if (eventSymbol.IsWindowsRuntimeEvent && valueKind != BindValueKind.Assignable) 1892if (valueKind == BindValueKind.RefOrOut) 1913private bool CheckIsValidReceiverForVariable(SyntaxNode node, BoundExpression receiver, BindValueKind kind, BindingDiagnosticBag diagnostics) 1948BindValueKind valueKind, 1989private bool CheckPropertyValueKind(SyntaxNode node, BoundExpression expr, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 2016else if (valueKind == BindValueKind.RefOrOut) 2088var setValueKind = setMethod.IsEffectivelyReadOnly ? BindValueKind.RValue : BindValueKind.Assignable; 3462private static void ReportReadonlyLocalError(SyntaxNode node, LocalSymbol local, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3465Debug.Assert(kind != BindValueKind.RValue); 3500private static ErrorCode GetThisLvalueError(BindValueKind kind, bool isValueType, bool isPrimaryConstructorParameter) 3504case BindValueKind.CompoundAssignment: 3505case BindValueKind.Assignable: 3508case BindValueKind.RefOrOut: 3511case BindValueKind.AddressOf: 3514case BindValueKind.IncrementDecrement: 3517case BindValueKind.RefReturn: 3518case BindValueKind.ReadonlyRef: 3521case BindValueKind.RefAssignable: 3533private static ErrorCode GetRangeLvalueError(BindValueKind kind) 3537case BindValueKind.Assignable: 3538case BindValueKind.CompoundAssignment: 3539case BindValueKind.IncrementDecrement: 3542case BindValueKind.AddressOf: 3545case BindValueKind.RefReturn: 3546case BindValueKind.ReadonlyRef: 3549case BindValueKind.RefAssignable: 3561private static ErrorCode GetMethodGroupOrFunctionPointerLvalueError(BindValueKind valueKind) 3572private static ErrorCode GetStandardLvalueError(BindValueKind kind) 3576case BindValueKind.CompoundAssignment: 3577case BindValueKind.Assignable: 3580case BindValueKind.AddressOf: 3583case BindValueKind.IncrementDecrement: 3586case BindValueKind.FixedReceiver: 3589case BindValueKind.RefReturn: 3590case BindValueKind.ReadonlyRef: 3593case BindValueKind.RefAssignable: 3621private static void ReportReadOnlyFieldError(FieldSymbol field, SyntaxNode node, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3629Debug.Assert(kind != BindValueKind.AddressOf); // If this assert fails, we probably should report ErrorCode.ERR_InvalidAddrOp 3646int index = (checkingReceiver ? 6 : 0) + (field.IsStatic ? 3 : 0) + (kind == BindValueKind.RefReturn ? 0 : (RequiresRefOrOut(kind) ? 1 : 2)); 3657private static void ReportReadOnlyError(Symbol symbol, SyntaxNode node, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3664if (kind == BindValueKind.AddressOf) 3682int 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);

532if (CheckValueKind(syntax, source, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 547if (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), 5813BindValueKind rhsValueKind, 5825Debug.Assert(rhsValueKind == BindValueKind.RValue); 5894var rhsKind = isRef ? GetRequiredRHSValueKindForRefAssignment(boundLeft) : BindValueKind.RValue; 5940var boundExpression = BindValue(memberInitializer, diagnostics, BindValueKind.RValue); 5955BindValueKind valueKind = isRhsNestedInitializer ? BindValueKind.RValue : (isRef ? BindValueKind.RefAssignable : BindValueKind.Assignable); 5968leftSyntax, implicitReceiver, BindValueKind.Assignable, false, diagnostics); 5975BindValueKind valueKind, 6216BindValueKind valueKind, 6250return ToBadExpression(boundMember, (valueKind == BindValueKind.RValue) ? LookupResultKind.NotAValue : LookupResultKind.NotAVariable); 6504var boundElementInitializer = BindInitializerExpressionOrValue(elementInitializer, initializerType, BindValueKind.RValue, implicitReceiver.Syntax, diagnostics); 6533exprBuilder.Add(BindValue(childElementInitializer, diagnostics, BindValueKind.RValue)); 7897boundLeft = CheckValue(boundLeft, BindValueKind.RValue, diagnostics); 8007boundLeft = CheckValue(boundLeft, BindValueKind.RValue, diagnostics); 9181hasError = !CheckValueKind(node, receiver, BindValueKind.FixedReceiver, checkingReceiver: false, diagnostics: diagnostics); 9637receiver = CheckValue(receiver, BindValueKind.RValue, diagnostics); 9767if (CheckValueKind(node, expr, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 9779if (!CheckValueKind(node, expr, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 10807lengthOrCountAccess = CheckValue(lengthOrCountAccess, BindValueKind.RValue, diagnostics); 11642var 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); 3274BoundExpression operand = BindToNaturalType(BindValue(operandSyntax, diagnostics, BindValueKind.IncrementDecrement), diagnostics); 3469!CheckValueKind(node, operand, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 4135BoundExpression operand = BindToNaturalType(BindValue(node.Operand, diagnostics, BindValueKind.AddressOf), diagnostics); 4222bool receiverIsLValue = CheckValueKind(receiver.Syntax, receiver, BindValueKind.AddressOf, checkingReceiver: false, diagnostics: BindingDiagnosticBag.Discarded); 4652private static BindValueKind GetBinaryAssignmentKind(SyntaxKind kind) 4657return BindValueKind.Assignable; 4670return BindValueKind.CompoundAssignment; 4672return BindValueKind.RValue; 4676private static BindValueKind GetUnaryAssignmentKind(SyntaxKind kind) 4684return BindValueKind.IncrementDecrement; 4689return BindValueKind.RValue; 5662var leftOperand = BindValue(node.Left, diagnostics, BindValueKind.RValue); 5664var rightOperand = BindValue(node.Right, diagnostics, BindValueKind.RValue); 5851BoundExpression leftOperand = BindValue(node.Left, diagnostics, BindValueKind.CompoundAssignment); 5853BoundExpression rightOperand = BindValue(node.Right, diagnostics, BindValueKind.RValue); 5978BoundExpression trueExpr = BindValue(whenTrue, diagnostics, BindValueKind.RValue); 5979BoundExpression falseExpr = BindValue(whenFalse, diagnostics, BindValueKind.RValue); 6019BoundExpression trueExpr = BindValue(whenTrue, diagnostics, BindValueKind.RValue | BindValueKind.RefersToLocation); 6020BoundExpression falseExpr = BindValue(whenFalse, diagnostics, BindValueKind.RValue | BindValueKind.RefersToLocation);

682indexerAccess = CheckValue(indexerAccess, BindValueKind.RValue, diagnostics); 848indexerAccess = CheckValue(indexerAccess, BindValueKind.RValue, diagnostics); 1033originalExpression = CheckValue(originalExpression, BindValueKind.RValue, diagnostics); 2280boundMember = CheckValue(boundMember, BindValueKind.RValue, diagnostics); 2293if (!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); 844if (CheckValueKind(collectionExpr.Syntax, collectionExpr, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 852if (!CheckValueKind(collectionExpr.Syntax, collectionExpr, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded))

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

519gotoCaseExpressionOpt = gotoBinder.BindValue(node.Expression, diagnostics, BindValueKind.RValue);

47BoundExpression armResult = armBinder.BindValue(node.Expression, diagnostics, BindValueKind.RValue);

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