257private const BindValueKind ValueKindSignificantBitsMask = unchecked((BindValueKind)~((1 << ValueKindInsignificantBits) - 1)); 354private static bool RequiresRValueOnly(BindValueKind kind) 356return (kind & ValueKindSignificantBitsMask) == BindValueKind.RValue; 359private static bool RequiresAssignmentOnly(BindValueKind kind) 361return (kind & ValueKindSignificantBitsMask) == BindValueKind.Assignable; 364private static bool RequiresVariable(BindValueKind kind) 369private static bool RequiresReferenceToLocation(BindValueKind kind) 371return (kind & BindValueKind.RefersToLocation) != 0; 374private static bool RequiresAssignableVariable(BindValueKind kind) 376return (kind & BindValueKind.Assignable) != 0; 379private static bool RequiresRefAssignableVariable(BindValueKind kind) 381return (kind & BindValueKind.RefAssignable) != 0; 384private static bool RequiresRefOrOut(BindValueKind kind) 386return (kind & BindValueKind.RefOrOut) == BindValueKind.RefOrOut; 391private static AccessorKind GetIndexerAccessorKind(BoundIndexerAccess indexerAccess, BindValueKind valueKind) 401private static AccessorKind GetAccessorKind(BindValueKind valueKind) 403var coreValueKind = valueKind & ValueKindSignificantBitsMask; 406BindValueKind.CompoundAssignment => AccessorKind.Both, 407BindValueKind.Assignable => AccessorKind.Set, 412private BoundIndexerAccess BindIndexerDefaultArgumentsAndParamsCollection(BoundIndexerAccess indexerAccess, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 414var coreValueKind = valueKind & ValueKindSignificantBitsMask; 416var useSetAccessor = coreValueKind == BindValueKind.Assignable && indexerAccess.Indexer.RefKind != RefKind.Ref; 511private BoundExpression CheckValue(BoundExpression expr, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 526Debug.Assert(expr.Syntax.Kind() != SyntaxKind.Argument || valueKind == BindValueKind.RefOrOut); 531Debug.Assert(valueKind == BindValueKind.RefOrOut); 535Debug.Assert(valueKind is (BindValueKind.Assignable or BindValueKind.RefOrOut or BindValueKind.RefAssignable) || diagnostics.DiagnosticBag is null || diagnostics.HasAnyResolvedErrors()); 585if (valueKind == BindValueKind.RValue) 592if ((valueKind & BindValueKind.RefersToLocation) == BindValueKind.RefersToLocation) 600if ((valueKind & BindValueKind.RefersToLocation) == BindValueKind.RefersToLocation) 614if (expr.Kind == BoundKind.MethodGroup && valueKind != BindValueKind.RValueOrMethodGroup) 663expr.HasAnyErrors && valueKind == BindValueKind.RValueOrMethodGroup) 668var resultKind = (valueKind == BindValueKind.RValue || valueKind == BindValueKind.RValueOrMethodGroup) ? 700internal bool CheckValueKind(SyntaxNode node, BoundExpression expr, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 758case BoundKind.MethodGroup when valueKind == BindValueKind.AddressOf: 980bool checkArrayAccessValueKind(SyntaxNode node, BindValueKind valueKind, ImmutableArray<BoundExpression> indices, BindingDiagnosticBag diagnostics) 1002private static void ReportThisLvalueError(SyntaxNode node, BindValueKind valueKind, bool isValueType, bool isPrimaryConstructorParameter, BindingDiagnosticBag diagnostics) 1030private void CheckAddressOfInAsyncOrIteratorMethod(SyntaxNode node, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1032if (valueKind == BindValueKind.AddressOf) 1045private bool CheckLocalValueKind(SyntaxNode node, BoundLocal local, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1135private bool CheckParameterValueKind(SyntaxNode node, BoundParameter parameter, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1137Debug.Assert(!RequiresAssignableVariable(BindValueKind.AddressOf)); 1198static void reportReadOnlyParameterError(ParameterSymbol parameterSymbol, SyntaxNode node, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1202Debug.Assert(valueKind != BindValueKind.AddressOf); // If this assert fails, we probably should report ErrorCode.ERR_InvalidAddrOp 1208if (valueKind == BindValueKind.RefReturn) 1227if (valueKind == BindValueKind.RefReturn) 1343private bool CheckFieldValueKind(SyntaxNode node, BoundFieldAccess fieldAccess, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1388Debug.Assert(valueKind == BindValueKind.RefAssignable); 1405return CheckIsValidReceiverForVariable(node, fieldAccess.ReceiverOpt, BindValueKind.Assignable, diagnostics); 1491private bool CheckSimpleAssignmentValueKind(SyntaxNode node, BoundAssignmentOperator assignment, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1570private bool CheckEventValueKind(BoundEventAccess boundEvent, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1581if (valueKind == BindValueKind.CompoundAssignment) 1607if (!CheckIsValidReceiverForVariable(eventSyntax, receiver, BindValueKind.Assignable, diagnostics)) 1614if (eventSymbol.IsWindowsRuntimeEvent && valueKind != BindValueKind.Assignable) 1618if (valueKind == BindValueKind.RefOrOut) 1639private bool CheckIsValidReceiverForVariable(SyntaxNode node, BoundExpression receiver, BindValueKind kind, BindingDiagnosticBag diagnostics) 1669BindValueKind valueKind, 1710private bool CheckPropertyValueKind(SyntaxNode node, BoundExpression expr, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1737else if (valueKind == BindValueKind.RefOrOut) 1808var setValueKind = setMethod.IsEffectivelyReadOnly ? BindValueKind.RValue : BindValueKind.Assignable; 3171private static void ReportReadonlyLocalError(SyntaxNode node, LocalSymbol local, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3174Debug.Assert(kind != BindValueKind.RValue); 3209private static ErrorCode GetThisLvalueError(BindValueKind kind, bool isValueType, bool isPrimaryConstructorParameter) 3213case BindValueKind.CompoundAssignment: 3214case BindValueKind.Assignable: 3217case BindValueKind.RefOrOut: 3220case BindValueKind.AddressOf: 3223case BindValueKind.IncrementDecrement: 3226case BindValueKind.RefReturn: 3227case BindValueKind.ReadonlyRef: 3230case BindValueKind.RefAssignable: 3242private static ErrorCode GetRangeLvalueError(BindValueKind kind) 3246case BindValueKind.Assignable: 3247case BindValueKind.CompoundAssignment: 3248case BindValueKind.IncrementDecrement: 3251case BindValueKind.AddressOf: 3254case BindValueKind.RefReturn: 3255case BindValueKind.ReadonlyRef: 3258case BindValueKind.RefAssignable: 3270private static ErrorCode GetMethodGroupOrFunctionPointerLvalueError(BindValueKind valueKind) 3281private static ErrorCode GetStandardLvalueError(BindValueKind kind) 3285case BindValueKind.CompoundAssignment: 3286case BindValueKind.Assignable: 3289case BindValueKind.AddressOf: 3292case BindValueKind.IncrementDecrement: 3295case BindValueKind.FixedReceiver: 3298case BindValueKind.RefReturn: 3299case BindValueKind.ReadonlyRef: 3302case BindValueKind.RefAssignable: 3330private static void ReportReadOnlyFieldError(FieldSymbol field, SyntaxNode node, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3338Debug.Assert(kind != BindValueKind.AddressOf); // If this assert fails, we probably should report ErrorCode.ERR_InvalidAddrOp 3355int index = (checkingReceiver ? 6 : 0) + (field.IsStatic ? 3 : 0) + (kind == BindValueKind.RefReturn ? 0 : (RequiresRefOrOut(kind) ? 1 : 2)); 3366private static void ReportReadOnlyError(Symbol symbol, SyntaxNode node, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3373if (kind == BindValueKind.AddressOf) 3391int 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; 3928if (!this.CheckValueKind(argument.Syntax, argument, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 3940if (this.CheckValueKind(argument.Syntax, argument, BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 4093var size = BindValue(dimension, diagnostics, BindValueKind.RValue); 4209var boundExpression = BindValue(expression, diagnostics, BindValueKind.RValue); 4226var boundExpression = BindValue(expression, diagnostics, BindValueKind.RValue); 4555count = BindValue(countSyntax, diagnostics, BindValueKind.RValue); 5270ExpressionElementSyntax expressionElementSyntax => @this.BindValue(expressionElementSyntax.Expression, diagnostics, BindValueKind.RValue), 5644BindValueKind rhsValueKind, 5656Debug.Assert(rhsValueKind == BindValueKind.RValue); 5744var rhsKind = isRef ? GetRequiredRHSValueKindForRefAssignment(boundLeft) : BindValueKind.RValue; 5792var boundExpression = BindValue(memberInitializer, diagnostics, BindValueKind.RValue); 5807BindValueKind valueKind = isRhsNestedInitializer ? BindValueKind.RValue : (isRef ? BindValueKind.RefAssignable : BindValueKind.Assignable); 5820leftSyntax, implicitReceiver, BindValueKind.Assignable, false, diagnostics); 5827BindValueKind valueKind, 6069BindValueKind valueKind, 6103return ToBadExpression(boundMember, (valueKind == BindValueKind.RValue) ? LookupResultKind.NotAValue : LookupResultKind.NotAVariable); 6358var boundElementInitializer = BindInitializerExpressionOrValue(elementInitializer, initializerType, BindValueKind.RValue, implicitReceiver.Syntax, diagnostics); 6387exprBuilder.Add(BindValue(childElementInitializer, diagnostics, BindValueKind.RValue)); 7675boundLeft = CheckValue(boundLeft, BindValueKind.RValue, diagnostics); 7785boundLeft = CheckValue(boundLeft, BindValueKind.RValue, diagnostics); 8962hasError = !CheckValueKind(node, receiver, BindValueKind.FixedReceiver, checkingReceiver: false, diagnostics: diagnostics); 9375receiver = CheckValue(receiver, BindValueKind.RValue, diagnostics); 9505if (CheckValueKind(node, expr, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 9517if (!CheckValueKind(node, expr, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 10542lengthOrCountAccess = CheckValue(lengthOrCountAccess, BindValueKind.RValue, diagnostics); 11338var 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); 730extensionMemberAccess = CheckValue(extensionMemberAccess, BindValueKind.RValue, diagnostics); 1269receiverArgument = CheckValue(receiverArgument, BindValueKind.RefOrOut, diagnostics); 1372receiver = CheckValue(receiver, BindValueKind.RefOrOut, diagnostics); 1399var valueKind = method.IsEffectivelyReadOnly 1400? BindValueKind.RefersToLocation 1401: BindValueKind.RefersToLocation | BindValueKind.Assignable; 1917return CheckValue(typeOrValue.Data.ValueExpression, BindValueKind.RValue, diagnostics); 2344boundArgument = 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; 1838BindValueKind valueKind, 2655var expr = BindValue(node, diagnostics, BindValueKind.RValue); 3008BindValueKind requiredValueKind = GetRequiredReturnValueKind(refKind); 3591BindValueKind requiredValueKind = bodyBinder.GetRequiredReturnValueKind(refKind); 3607BindValueKind requiredValueKind = GetRequiredReturnValueKind(refKind); 3621private BindValueKind GetRequiredReturnValueKind(RefKind refKind) 3623BindValueKind requiredValueKind = BindValueKind.RValue; 3628BindValueKind.RefReturn : 3629BindValueKind.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),