private static void HandleProperty(SyntaxNodeAnalysisContext context)
{
if (context.IsExcludedFromAnalysis())
{
return;
}
AccessorDeclarationSyntax setter = (AccessorDeclarationSyntax)context.Node;
if (setter.Body != null)
{
return;
}
var propertySymbol = context.ContainingProperty();
if (propertySymbol.SetMethod?.DeclaredAccessibility != Accessibility.Private ||
propertySymbol.IsIndexer)
{
return;
}
using (var pooled = AssignedValueWalker.Create(propertySymbol, context.SemanticModel, context.CancellationToken))
{
foreach (var value in pooled.Item)
{
if (MeansPropertyIsMutable(value))
{
return;
}
}
}
context.ReportDiagnostic(Diagnostic.Create(Descriptor, setter.GetLocation()));
}
private static bool IsPotentiallyCachedOrInjectedCore(ExpressionSyntax value, SemanticModel semanticModel, CancellationToken cancellationToken)
{
var symbol = semanticModel.GetSymbolSafe(value, cancellationToken);
if (IsInjectedCore(symbol) == Result.Yes)
{
return(true);
}
if (symbol is IPropertySymbol property &&
!property.IsAutoProperty(cancellationToken))
{
using (var returnValues = ReturnValueWalker.Create(value, Search.TopLevel, semanticModel, cancellationToken))
{
using (var recursive = RecursiveValues.Create(returnValues.Item, semanticModel, cancellationToken))
{
return(IsInjectedCore(recursive, semanticModel, cancellationToken)
.IsEither(Result.Yes, Result.Maybe));
}
}
}
using (var sources = AssignedValueWalker.Create(value, semanticModel, cancellationToken))
{
using (var recursive = RecursiveValues.Create(sources.Item, semanticModel, cancellationToken))
{
return(IsInjectedCore(recursive, semanticModel, cancellationToken).IsEither(Result.Yes, Result.Maybe));
}
}
}
internal static Result IsAssignedWithCreated(ISymbol symbol, SyntaxNode context, SemanticModel semanticModel, CancellationToken cancellationToken)
{
using (var pooled = AssignedValueWalker.Create(symbol, context, semanticModel, cancellationToken))
{
using (var recursive = RecursiveValues.Create(pooled.Item, semanticModel, cancellationToken))
{
return(IsAssignedWithCreated(recursive, semanticModel, cancellationToken));
}
}
}
internal static Result IsAssignedWithCreated(IFieldSymbol field, SemanticModel semanticModel, CancellationToken cancellationToken)
{
if (!IsPotentiallyAssignableTo(field?.Type))
{
return(Result.No);
}
using (var pooled = AssignedValueWalker.Create(field, semanticModel, cancellationToken))
{
using (var recursive = RecursiveValues.Create(pooled.Item, semanticModel, cancellationToken))
{
return(IsAssignedWithCreated(recursive, semanticModel, cancellationToken));
}
}
}
internal static bool IsAssignedWithCreatedAndNotCachedOrInjected(IFieldSymbol field, SemanticModel semanticModel, CancellationToken cancellationToken)
{
if (field == null ||
!IsPotentiallyAssignableTo(field.Type))
{
return(false);
}
using (var sources = AssignedValueWalker.Create(field, semanticModel, cancellationToken))
{
using (var recursive = RecursiveValues.Create(sources.Item, semanticModel, cancellationToken))
{
return(IsAssignedWithCreated(recursive, semanticModel, cancellationToken).IsEither(Result.Yes, Result.Maybe) &&
!IsInjectedCore(recursive, semanticModel, cancellationToken).IsEither(Result.Yes, Result.Maybe));
}
}
}
internal static bool IsAssignedWithCreatedAndInjected(IPropertySymbol property, SemanticModel semanticModel, CancellationToken cancellationToken)
{
if (property == null ||
!IsPotentiallyAssignableTo(property.Type))
{
return(false);
}
using (var sources = AssignedValueWalker.Create(property, semanticModel, cancellationToken))
{
using (var recursive = RecursiveValues.Create(sources.Item, semanticModel, cancellationToken))
{
return(IsAssignedWithCreated(recursive, semanticModel, cancellationToken).IsEither(Result.Yes, Result.Maybe) &&
IsInjectedCore(recursive, semanticModel, cancellationToken).IsEither(Result.Yes, Result.Maybe));
}
}
}
private static bool IsInjected(ISymbol member, SemanticModel semanticModel, CancellationToken cancellationToken)
{
if (member is IFieldSymbol field)
{
using (var pooled = AssignedValueWalker.Create(field, semanticModel, cancellationToken))
{
foreach (var assignedValue in pooled.Item)
{
if (assignedValue.FirstAncestorOrSelf <ConstructorDeclarationSyntax>() == null)
{
continue;
}
if (semanticModel.GetSymbolSafe(assignedValue, cancellationToken) is IParameterSymbol)
{
return(true);
}
}
}
}
if (member is IPropertySymbol property)
{
using (var pooled = AssignedValueWalker.Create(property, semanticModel, cancellationToken))
{
foreach (var assignedValue in pooled.Item)
{
if (assignedValue.FirstAncestorOrSelf <ConstructorDeclarationSyntax>() == null)
{
continue;
}
if (semanticModel.GetSymbolSafe(assignedValue, cancellationToken) is IParameterSymbol)
{
return(true);
}
}
}
}
return(false);
}
private static bool IsNeverNull(ISymbol member, SemanticModel semanticModel, CancellationToken cancellationToken)
{
if (!(member is IFieldSymbol || member is IPropertySymbol))
{
return(false);
}
using (var sources = AssignedValueWalker.Create(member, semanticModel, cancellationToken))
{
foreach (var value in sources.Item)
{
if (value is ObjectCreationExpressionSyntax)
{
continue;
}
return(false);
}
}
return(true);
}
/// <summary>
/// Check if any path returns a created IDisposable
/// </summary>
internal static bool IsPotentiallyCachedOrInjected(InvocationExpressionSyntax disposeCall, SemanticModel semanticModel, CancellationToken cancellationToken)
{
if (!TryGetDisposedRootMember(disposeCall, semanticModel, cancellationToken, out ExpressionSyntax member))
{
return(false);
}
var symbol = semanticModel.GetSymbolSafe(member, cancellationToken);
if (IsInjectedCore(symbol).IsEither(Result.Yes, Result.Maybe))
{
return(true);
}
using (var sources = AssignedValueWalker.Create(symbol, disposeCall, semanticModel, cancellationToken))
{
using (var recursive = RecursiveValues.Create(sources.Item, semanticModel, cancellationToken))
{
return(IsInjectedCore(recursive, semanticModel, cancellationToken).IsEither(Result.Yes, Result.Maybe));
}
}
}
private static Result IsInjectedCore(RecursiveValues values, SemanticModel semanticModel, CancellationToken cancellationToken)
{
if (values.Count == 0)
{
return(Result.No);
}
var result = Result.No;
values.Reset();
while (values.MoveNext())
{
if (values.Current is ElementAccessExpressionSyntax elementAccess)
{
var symbol = semanticModel.GetSymbolSafe(elementAccess.Expression, cancellationToken);
var isInjected = IsInjectedCore(symbol);
if (isInjected == Result.Yes)
{
return(Result.Yes);
}
if (isInjected == Result.Maybe)
{
result = Result.Maybe;
}
using (var sources = AssignedValueWalker.Create(values.Current, semanticModel, cancellationToken))
{
using (var recursive = RecursiveValues.Create(sources.Item, semanticModel, cancellationToken))
{
isInjected = IsInjectedCore(recursive, semanticModel, cancellationToken);
if (isInjected == Result.Yes)
{
return(Result.Yes);
}
if (isInjected == Result.Maybe)
{
result = Result.Maybe;
}
}
}
}
else
{
var symbol = semanticModel.GetSymbolSafe(values.Current, cancellationToken);
var isInjected = IsInjectedCore(symbol);
if (isInjected == Result.Yes)
{
return(Result.Yes);
}
if (isInjected == Result.Maybe)
{
result = Result.Maybe;
}
}
}
return(result);
}
private bool AddRecursiveValues(ExpressionSyntax assignedValue)
{
if (assignedValue == null ||
assignedValue.IsMissing ||
!this.checkedLocations.Add(assignedValue))
{
return(false);
}
if (assignedValue is LiteralExpressionSyntax ||
assignedValue is DefaultExpressionSyntax ||
assignedValue is TypeOfExpressionSyntax ||
assignedValue is ObjectCreationExpressionSyntax ||
assignedValue is ArrayCreationExpressionSyntax ||
assignedValue is ImplicitArrayCreationExpressionSyntax ||
assignedValue is InitializerExpressionSyntax)
{
this.values.Add(assignedValue);
return(true);
}
var argument = assignedValue.Parent as ArgumentSyntax;
if (argument?.RefOrOutKeyword.IsKind(SyntaxKind.OutKeyword) == true)
{
var invocation = assignedValue.FirstAncestor <InvocationExpressionSyntax>();
var invokedMethod = this.semanticModel.GetSymbolSafe(invocation, this.cancellationToken);
if (invokedMethod == null ||
invokedMethod.DeclaringSyntaxReferences.Length == 0)
{
this.values.Add(invocation);
return(true);
}
var before = this.values.Count;
foreach (var reference in invokedMethod.DeclaringSyntaxReferences)
{
var methodDeclaration = reference.GetSyntax(this.cancellationToken) as MethodDeclarationSyntax;
if (methodDeclaration.TryGetMatchingParameter(argument, out ParameterSyntax parameter))
{
using (var pooled = AssignedValueWalker.Create(this.semanticModel.GetDeclaredSymbolSafe(parameter, this.cancellationToken), this.semanticModel, this.cancellationToken))
{
pooled.Item.HandleInvoke(invokedMethod, invocation.ArgumentList);
return(this.AddManyRecursively(pooled.Item));
}
}
}
return(before != this.values.Count);
}
if (assignedValue is BinaryExpressionSyntax binaryExpression)
{
switch (binaryExpression.Kind())
{
case SyntaxKind.CoalesceExpression:
var left = this.AddRecursiveValues(binaryExpression.Left);
var right = this.AddRecursiveValues(binaryExpression.Right);
return(left || right);
case SyntaxKind.AsExpression:
return(this.AddRecursiveValues(binaryExpression.Left));
default:
return(false);
}
}
if (assignedValue is CastExpressionSyntax cast)
{
return(this.AddRecursiveValues(cast.Expression));
}
if (assignedValue is ConditionalExpressionSyntax conditional)
{
var whenTrue = this.AddRecursiveValues(conditional.WhenTrue);
var whenFalse = this.AddRecursiveValues(conditional.WhenFalse);
return(whenTrue || whenFalse);
}
if (assignedValue is AwaitExpressionSyntax @await)
{
using (var pooled = ReturnValueWalker.Create(@await, Search.Recursive, this.semanticModel, this.cancellationToken))
{
return(this.AddManyRecursively(pooled.Item));
}
}
if (assignedValue is ElementAccessExpressionSyntax)
{
this.values.Add(assignedValue);
return(true);
}
var symbol = this.semanticModel.GetSymbolSafe(assignedValue, this.cancellationToken);
if (symbol == null)
{
return(false);
}
if (symbol is IFieldSymbol)
{
this.values.Add(assignedValue);
return(true);
}
if (symbol is IParameterSymbol)
{
this.values.Add(assignedValue);
using (var pooled = AssignedValueWalker.Create(assignedValue, this.semanticModel, this.cancellationToken))
{
return(this.AddManyRecursively(pooled.Item));
}
}
if (symbol is ILocalSymbol)
{
using (var pooled = AssignedValueWalker.Create(assignedValue, this.semanticModel, this.cancellationToken))
{
return(this.AddManyRecursively(pooled.Item));
}
}
if (symbol is IPropertySymbol property)
{
if (property.DeclaringSyntaxReferences.Length == 0)
{
this.values.Add(assignedValue);
return(true);
}
using (var returnValues = ReturnValueWalker.Create(assignedValue, Search.Recursive, this.semanticModel, this.cancellationToken))
{
return(this.AddManyRecursively(returnValues.Item));
}
}
if (symbol is IMethodSymbol method)
{
if (method.DeclaringSyntaxReferences.Length == 0)
{
this.values.Add(assignedValue);
return(true);
}
using (var pooled = ReturnValueWalker.Create(assignedValue, Search.Recursive, this.semanticModel, this.cancellationToken))
{
return(this.AddManyRecursively(pooled.Item));
}
}
return(false);
}
/// <summary>
/// Check if any path returns a created IDisposable
/// </summary>
internal static Result IsAssignedWithCreated(ExpressionSyntax disposable, SemanticModel semanticModel, CancellationToken cancellationToken, out ISymbol assignedSymbol)
{
if (!IsPotentiallyAssignableTo(disposable, semanticModel, cancellationToken))
{
assignedSymbol = null;
return(Result.No);
}
if (semanticModel.GetSymbolSafe(disposable, cancellationToken) is IPropertySymbol property &&
property.TryGetSetter(cancellationToken, out AccessorDeclarationSyntax setter))
{
using (var pooledSet = SetPool <ISymbol> .Create())
{
using (var pooledAssigned = Assignment.Create(setter, Search.Recursive, semanticModel, cancellationToken))
{
foreach (var assigned in pooledAssigned.Item.Assignments)
{
var symbol = semanticModel.GetSymbolSafe(assigned.Left, cancellationToken);
if (IsPotentiallyAssignableTo(assigned.Left, semanticModel, cancellationToken) &&
(symbol is IFieldSymbol ||
symbol is IPropertySymbol))
{
pooledSet.Item.Add(symbol).IgnoreReturnValue();
}
}
}
assignedSymbol = null;
var result = Result.No;
foreach (var symbol in pooledSet.Item)
{
switch (IsAssignedWithCreated(symbol, disposable, semanticModel, cancellationToken))
{
case Result.Unknown:
if (result == Result.No)
{
assignedSymbol = symbol;
result = Result.Unknown;
}
break;
case Result.Yes:
assignedSymbol = symbol;
return(Result.Yes);
case Result.No:
break;
case Result.Maybe:
assignedSymbol = symbol;
result = Result.Maybe;
break;
default:
throw new ArgumentOutOfRangeException();
}
}
return(result);
}
}
using (var pooled = AssignedValueWalker.Create(disposable, semanticModel, cancellationToken))
{
using (var recursive = RecursiveValues.Create(pooled.Item, semanticModel, cancellationToken))
{
assignedSymbol = pooled.Item.CurrentSymbol;
return(IsAssignedWithCreated(recursive, semanticModel, cancellationToken));
}
}
}
private void AddReturnValue(ExpressionSyntax value)
{
if (this.awaits)
{
if (AsyncAwait.TryAwaitTaskRun(value, this.semanticModel, this.cancellationToken, out ExpressionSyntax awaited))
{
using (var pooled = this.GetRecursive(awaited))
{
if (pooled.Item.values.Count == 0)
{
this.values.Add(awaited);
}
else
{
foreach (var returnValue in pooled.Item.values)
{
this.AddReturnValue(returnValue);
}
}
}
return;
}
if (AsyncAwait.TryAwaitTaskFromResult(value, this.semanticModel, this.cancellationToken, out awaited))
{
this.AddReturnValue(awaited);
return;
}
if (this.search == Search.Recursive &&
value is AwaitExpressionSyntax @await)
{
value = @await.Expression;
}
}
if (this.search == Search.Recursive)
{
if (value is InvocationExpressionSyntax invocation)
{
var method = this.semanticModel.GetSymbolSafe(invocation, this.cancellationToken);
if (method == null ||
method.DeclaringSyntaxReferences.Length == 0)
{
this.values.Add(value);
}
else
{
using (var pooled = this.GetRecursive(value))
{
foreach (var returnValue in pooled.Item.values)
{
this.AddReturnValue(returnValue);
}
}
}
}
else if (this.recursionLoop.Add(value) &&
this.semanticModel.IsEither <IParameterSymbol, ILocalSymbol>(value, this.cancellationToken))
{
using (var pooled = AssignedValueWalker.Create(value, this.semanticModel, this.cancellationToken))
{
if (pooled.Item.Count == 0)
{
this.values.Add(value);
}
else
{
foreach (var assignment in pooled.Item)
{
this.AddReturnValue(assignment);
}
}
}
}
else
{
this.values.Add(value);
}
}
else
{
this.values.Add(value);
}
}