256private const BindValueKind ValueKindSignificantBitsMask = unchecked((BindValueKind)~((1 << ValueKindInsignificantBits) - 1)); 353private static bool RequiresRValueOnly(BindValueKind kind) 355return (kind & ValueKindSignificantBitsMask) == BindValueKind.RValue; 358private static bool RequiresAssignmentOnly(BindValueKind kind) 360return (kind & ValueKindSignificantBitsMask) == BindValueKind.Assignable; 363private static bool RequiresVariable(BindValueKind kind) 368private static bool RequiresReferenceToLocation(BindValueKind kind) 370return (kind & BindValueKind.RefersToLocation) != 0; 373private static bool RequiresAssignableVariable(BindValueKind kind) 375return (kind & BindValueKind.Assignable) != 0; 378private static bool RequiresRefAssignableVariable(BindValueKind kind) 380return (kind & BindValueKind.RefAssignable) != 0; 383private static bool RequiresRefOrOut(BindValueKind kind) 385return (kind & BindValueKind.RefOrOut) == BindValueKind.RefOrOut; 390private static AccessorKind GetIndexerAccessorKind(BoundIndexerAccess indexerAccess, BindValueKind valueKind) 400private static AccessorKind GetAccessorKind(BindValueKind valueKind) 402var coreValueKind = valueKind & ValueKindSignificantBitsMask; 405BindValueKind.CompoundAssignment => AccessorKind.Both, 406BindValueKind.Assignable => AccessorKind.Set, 411private BoundIndexerAccess BindIndexerDefaultArgumentsAndParamsCollection(BoundIndexerAccess indexerAccess, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 413var coreValueKind = valueKind & ValueKindSignificantBitsMask; 415var useSetAccessor = coreValueKind == BindValueKind.Assignable && indexerAccess.Indexer.RefKind != RefKind.Ref; 510private BoundExpression CheckValue(BoundExpression expr, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 525Debug.Assert(expr.Syntax.Kind() != SyntaxKind.Argument || valueKind == BindValueKind.RefOrOut); 530Debug.Assert(valueKind == BindValueKind.RefOrOut); 534Debug.Assert(valueKind is (BindValueKind.Assignable or BindValueKind.RefOrOut or BindValueKind.RefAssignable) || diagnostics.DiagnosticBag is null || diagnostics.HasAnyResolvedErrors()); 582if (valueKind == BindValueKind.RValue) 589if (valueKind == BindValueKind.RValue) 596if ((valueKind & BindValueKind.RefersToLocation) == BindValueKind.RefersToLocation) 604if ((valueKind & BindValueKind.RefersToLocation) == BindValueKind.RefersToLocation) 618if (expr.Kind == BoundKind.MethodGroup && valueKind != BindValueKind.RValueOrMethodGroup) 667expr.HasAnyErrors && valueKind == BindValueKind.RValueOrMethodGroup) 672var resultKind = (valueKind == BindValueKind.RValue || valueKind == BindValueKind.RValueOrMethodGroup) ? 704internal bool CheckValueKind(SyntaxNode node, BoundExpression expr, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 762case BoundKind.MethodGroup when valueKind == BindValueKind.AddressOf: 984bool checkArrayAccessValueKind(SyntaxNode node, BindValueKind valueKind, ImmutableArray<BoundExpression> indices, BindingDiagnosticBag diagnostics) 1006private static void ReportThisLvalueError(SyntaxNode node, BindValueKind valueKind, bool isValueType, bool isPrimaryConstructorParameter, BindingDiagnosticBag diagnostics) 1034private void CheckAddressOfInAsyncOrIteratorMethod(SyntaxNode node, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1036if (valueKind == BindValueKind.AddressOf) 1049private bool CheckLocalValueKind(SyntaxNode node, BoundLocal local, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1139private bool CheckParameterValueKind(SyntaxNode node, BoundParameter parameter, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1141Debug.Assert(!RequiresAssignableVariable(BindValueKind.AddressOf)); 1202static void reportReadOnlyParameterError(ParameterSymbol parameterSymbol, SyntaxNode node, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1206Debug.Assert(valueKind != BindValueKind.AddressOf); // If this assert fails, we probably should report ErrorCode.ERR_InvalidAddrOp 1212if (valueKind == BindValueKind.RefReturn) 1231if (valueKind == BindValueKind.RefReturn) 1347private bool CheckFieldValueKind(SyntaxNode node, BoundFieldAccess fieldAccess, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1393Debug.Assert(valueKind == BindValueKind.RefAssignable); 1402return CheckIsValidReceiverForVariable(node, fieldAccess.ReceiverOpt, BindValueKind.Assignable, diagnostics); 1487private bool CheckSimpleAssignmentValueKind(SyntaxNode node, BoundAssignmentOperator assignment, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1566private bool CheckEventValueKind(BoundEventAccess boundEvent, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1577if (valueKind == BindValueKind.CompoundAssignment) 1603if (!CheckIsValidReceiverForVariable(eventSyntax, receiver, BindValueKind.Assignable, diagnostics)) 1610if (eventSymbol.IsWindowsRuntimeEvent && valueKind != BindValueKind.Assignable) 1614if (valueKind == BindValueKind.RefOrOut) 1635private bool CheckIsValidReceiverForVariable(SyntaxNode node, BoundExpression receiver, BindValueKind kind, BindingDiagnosticBag diagnostics) 1665BindValueKind valueKind, 1706private bool CheckPropertyValueKind(SyntaxNode node, BoundExpression expr, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1733else if (valueKind == BindValueKind.RefOrOut) 1804var setValueKind = setMethod.IsEffectivelyReadOnly ? BindValueKind.RValue : BindValueKind.Assignable; 3167private static void ReportReadonlyLocalError(SyntaxNode node, LocalSymbol local, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3170Debug.Assert(kind != BindValueKind.RValue); 3205private static ErrorCode GetThisLvalueError(BindValueKind kind, bool isValueType, bool isPrimaryConstructorParameter) 3209case BindValueKind.CompoundAssignment: 3210case BindValueKind.Assignable: 3213case BindValueKind.RefOrOut: 3216case BindValueKind.AddressOf: 3219case BindValueKind.IncrementDecrement: 3222case BindValueKind.RefReturn: 3223case BindValueKind.ReadonlyRef: 3226case BindValueKind.RefAssignable: 3238private static ErrorCode GetRangeLvalueError(BindValueKind kind) 3242case BindValueKind.Assignable: 3243case BindValueKind.CompoundAssignment: 3244case BindValueKind.IncrementDecrement: 3247case BindValueKind.AddressOf: 3250case BindValueKind.RefReturn: 3251case BindValueKind.ReadonlyRef: 3254case BindValueKind.RefAssignable: 3266private static ErrorCode GetMethodGroupOrFunctionPointerLvalueError(BindValueKind valueKind) 3277private static ErrorCode GetStandardLvalueError(BindValueKind kind) 3281case BindValueKind.CompoundAssignment: 3282case BindValueKind.Assignable: 3285case BindValueKind.AddressOf: 3288case BindValueKind.IncrementDecrement: 3291case BindValueKind.FixedReceiver: 3294case BindValueKind.RefReturn: 3295case BindValueKind.ReadonlyRef: 3298case BindValueKind.RefAssignable: 3326private static void ReportReadOnlyFieldError(FieldSymbol field, SyntaxNode node, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3334Debug.Assert(kind != BindValueKind.AddressOf); // If this assert fails, we probably should report ErrorCode.ERR_InvalidAddrOp 3351int index = (checkingReceiver ? 6 : 0) + (field.IsStatic ? 3 : 0) + (kind == BindValueKind.RefReturn ? 0 : (RequiresRefOrOut(kind) ? 1 : 2)); 3362private static void ReportReadOnlyError(Symbol symbol, SyntaxNode node, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3369if (kind == BindValueKind.AddressOf) 3387int 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); 2584BoundExpression operand = this.BindValue(node.Expression, diagnostics, BindValueKind.RValue); 2609BoundExpression boundOperand = BindValue(node.Operand, diagnostics, BindValueKind.RValue); 2717BoundExpression boundOperand = BindValue(operand, diagnostics, BindValueKind.RValue); 3120var requiredValueKind = origRefKind == RefKind.In ? BindValueKind.ReadonlyRef : BindValueKind.RefOrOut; 3401BindValueKind valueKind = 3403BindValueKind.RValue : 3405BindValueKind.ReadonlyRef : 3406BindValueKind.RefOrOut; 3926if (!this.CheckValueKind(argument.Syntax, argument, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 3938if (this.CheckValueKind(argument.Syntax, argument, BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 4091var size = BindValue(dimension, diagnostics, BindValueKind.RValue); 4207var boundExpression = BindValue(expression, diagnostics, BindValueKind.RValue); 4224var boundExpression = BindValue(expression, diagnostics, BindValueKind.RValue); 4553count = BindValue(countSyntax, diagnostics, BindValueKind.RValue); 5268ExpressionElementSyntax expressionElementSyntax => @this.BindValue(expressionElementSyntax.Expression, diagnostics, BindValueKind.RValue), 5642BindValueKind rhsValueKind, 5654Debug.Assert(rhsValueKind == BindValueKind.RValue); 5742var rhsKind = isRef ? GetRequiredRHSValueKindForRefAssignment(boundLeft) : BindValueKind.RValue; 5790var boundExpression = BindValue(memberInitializer, diagnostics, BindValueKind.RValue); 5805BindValueKind valueKind = isRhsNestedInitializer ? BindValueKind.RValue : (isRef ? BindValueKind.RefAssignable : BindValueKind.Assignable); 5818leftSyntax, implicitReceiver, BindValueKind.Assignable, false, diagnostics); 5825BindValueKind valueKind, 6067BindValueKind valueKind, 6101return ToBadExpression(boundMember, (valueKind == BindValueKind.RValue) ? LookupResultKind.NotAValue : LookupResultKind.NotAVariable); 6356var boundElementInitializer = BindInitializerExpressionOrValue(elementInitializer, initializerType, BindValueKind.RValue, implicitReceiver.Syntax, diagnostics); 6385exprBuilder.Add(BindValue(childElementInitializer, diagnostics, BindValueKind.RValue)); 7673boundLeft = CheckValue(boundLeft, BindValueKind.RValue, diagnostics); 7783boundLeft = CheckValue(boundLeft, BindValueKind.RValue, diagnostics); 8952hasError = !CheckValueKind(node, receiver, BindValueKind.FixedReceiver, checkingReceiver: false, diagnostics: diagnostics); 9365receiver = CheckValue(receiver, BindValueKind.RValue, diagnostics); 9495if (CheckValueKind(node, expr, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 9507if (!CheckValueKind(node, expr, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 10532lengthOrCountAccess = CheckValue(lengthOrCountAccess, BindValueKind.RValue, diagnostics); 11328var 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); 729extensionMemberAccess = CheckValue(extensionMemberAccess, BindValueKind.RValue, diagnostics); 1268receiverArgument = CheckValue(receiverArgument, BindValueKind.RefOrOut, diagnostics); 1370receiver = CheckValue(receiver, BindValueKind.RefOrOut, diagnostics); 1397var valueKind = method.IsEffectivelyReadOnly 1398? BindValueKind.RefersToLocation 1399: BindValueKind.RefersToLocation | BindValueKind.Assignable; 1915return CheckValue(typeOrValue.Data.ValueExpression, BindValueKind.RValue, diagnostics); 2309boundArgument = CheckValue(boundArgument, BindValueKind.RValue, diagnostics);

27BoundExpression right = BindValue(node.Right, diagnostics, BindValueKind.RValue); 99if (left.Kind == BoundKind.EventAccess && !CheckEventValueKind((BoundEventAccess)left, BindValueKind.Assignable, diagnostics)) 494BindValueKind bindValueKind = GetBinaryAssignmentKind(syntaxNode.Kind()); 496BoundExpression right = BindValue(syntaxNode.Right, diagnostics, BindValueKind.RValue); 2269BoundExpression operand = BindToNaturalType(BindValue(operandSyntax, diagnostics, BindValueKind.IncrementDecrement), diagnostics); 2517BoundExpression operand = BindToNaturalType(BindValue(node.Operand, diagnostics, BindValueKind.AddressOf), diagnostics); 2604bool receiverIsLValue = CheckValueKind(receiver.Syntax, receiver, BindValueKind.AddressOf, checkingReceiver: false, diagnostics: BindingDiagnosticBag.Discarded); 3029private static BindValueKind GetBinaryAssignmentKind(SyntaxKind kind) 3034return BindValueKind.Assignable; 3047return BindValueKind.CompoundAssignment; 3049return BindValueKind.RValue; 3053private static BindValueKind GetUnaryAssignmentKind(SyntaxKind kind) 3061return BindValueKind.IncrementDecrement; 3066return BindValueKind.RValue; 3987var leftOperand = BindValue(node.Left, diagnostics, BindValueKind.RValue); 3989var rightOperand = BindValue(node.Right, diagnostics, BindValueKind.RValue); 4176BoundExpression leftOperand = BindValue(node.Left, diagnostics, BindValueKind.CompoundAssignment); 4178BoundExpression rightOperand = BindValue(node.Right, diagnostics, BindValueKind.RValue); 4305BoundExpression trueExpr = BindValue(whenTrue, diagnostics, BindValueKind.RValue); 4306BoundExpression falseExpr = BindValue(whenFalse, diagnostics, BindValueKind.RValue); 4346BoundExpression trueExpr = BindValue(whenTrue, diagnostics, BindValueKind.RValue | BindValueKind.RefersToLocation); 4347BoundExpression falseExpr = BindValue(whenFalse, diagnostics, BindValueKind.RValue | BindValueKind.RefersToLocation);

239indexerAccess = CheckValue(indexerAccess, BindValueKind.RValue, diagnostics); 388indexerAccess = CheckValue(indexerAccess, BindValueKind.RValue, diagnostics); 536expression = CheckValue(expression, BindValueKind.RValue, diagnostics); 1588boundMember = CheckValue(boundMember, BindValueKind.RValue, diagnostics); 1601if (!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; 1838BindValueKind valueKind, 2655var expr = BindValue(node, diagnostics, BindValueKind.RValue); 3010BindValueKind requiredValueKind = GetRequiredReturnValueKind(refKind); 3593BindValueKind requiredValueKind = bodyBinder.GetRequiredReturnValueKind(refKind); 3609BindValueKind requiredValueKind = GetRequiredReturnValueKind(refKind); 3623private BindValueKind GetRequiredReturnValueKind(RefKind refKind) 3625BindValueKind requiredValueKind = BindValueKind.RValue; 3630BindValueKind.RefReturn : 3631BindValueKind.ReadonlyRef;

343BindValueKind requiredCurrentKind; 347requiredCurrentKind = BindValueKind.RValue; 350requiredCurrentKind = BindValueKind.Assignable | BindValueKind.RefersToLocation; 353requiredCurrentKind = BindValueKind.RefersToLocation; 622BoundExpression collectionExpr = this.GetBinder(collectionSyntax).BindValue(collectionSyntax, diagnostics, BindValueKind.RValue); 832if (CheckValueKind(collectionExpr.Syntax, collectionExpr, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 840if (!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);

92binder.BindValue(sizeExpression, diagnostics, Binder.BindValueKind.RValue),