private static void HandleFieldOrProperty(SyntaxNodeAnalysisContext context, FieldOrProperty fieldOrProperty)
{
using (var assignedValues = AssignedValueWalker.Borrow(fieldOrProperty.Symbol, context.SemanticModel, context.CancellationToken))
{
using (var recursive = RecursiveValues.Borrow(assignedValues, context.SemanticModel, context.CancellationToken))
{
if (Disposable.IsAnyCreation(recursive, context.SemanticModel, context.CancellationToken).IsEither(Result.Yes, Result.AssumeYes))
{
if (Disposable.IsAnyCachedOrInjected(recursive, context.SemanticModel, context.CancellationToken).IsEither(Result.Yes, Result.AssumeYes) ||
IsMutableFromOutside(fieldOrProperty))
{
context.ReportDiagnostic(Diagnostic.Create(IDISP008DontMixInjectedAndCreatedForMember.Descriptor, context.Node.GetLocation()));
}
else if (context.Node.TryFirstAncestorOrSelf <TypeDeclarationSyntax>(out var typeDeclaration) &&
DisposableMember.IsDisposed(fieldOrProperty, typeDeclaration, context.SemanticModel, context.CancellationToken).IsEither(Result.No, Result.AssumeNo) &&
!TestFixture.IsAssignedAndDisposedInSetupAndTearDown(fieldOrProperty, typeDeclaration, context.SemanticModel, context.CancellationToken))
{
context.ReportDiagnostic(Diagnostic.Create(IDISP002DisposeMember.Descriptor, context.Node.GetLocation()));
if (!DisposeMethod.TryFindFirst(fieldOrProperty.ContainingType, context.Compilation, Search.TopLevel, out _) &&
!TestFixture.IsAssignedInSetUp(fieldOrProperty, typeDeclaration, context.SemanticModel, context.CancellationToken, out _))
{
context.ReportDiagnostic(Diagnostic.Create(IDISP006ImplementIDisposable.Descriptor, context.Node.GetLocation()));
}
}
}
}
}
}
internal static Result IsAssignedWithCreated(ISymbol symbol, ExpressionSyntax location, SemanticModel semanticModel, CancellationToken cancellationToken)
{
using (var assignedValues = AssignedValueWalker.Borrow(symbol, location, semanticModel, cancellationToken))
{
using (var recursive = RecursiveValues.Borrow(assignedValues, semanticModel, cancellationToken))
{
return(IsAnyCreation(recursive, semanticModel, cancellationToken));
}
}
}
private static bool IsAssignedWithInjected(ISymbol symbol, ExpressionSyntax location, SemanticModel semanticModel, CancellationToken cancellationToken)
{
using (var assignedValues = AssignedValueWalker.Borrow(symbol, location, semanticModel, cancellationToken))
{
using (var recursive = RecursiveValues.Borrow(assignedValues, semanticModel, cancellationToken))
{
return(IsAnyCachedOrInjected(recursive, semanticModel, cancellationToken).IsEither(Result.Yes, Result.AssumeYes));
}
}
}
internal static bool IsCachedOrInjectedOnly(ExpressionSyntax value, ExpressionSyntax location, SemanticModel semanticModel, CancellationToken cancellationToken)
{
if (semanticModel.TryGetSymbol(value, cancellationToken, out var symbol))
{
using var assignedValues = AssignedValueWalker.Borrow(symbol, location, semanticModel, cancellationToken);
using var recursive = RecursiveValues.Borrow(assignedValues, semanticModel, cancellationToken);
return((IsAnyCachedOrInjected(recursive, semanticModel, cancellationToken).IsEither(Result.Yes, Result.AssumeYes) ||
IsInjectedCore(symbol).IsEither(Result.Yes, Result.AssumeYes)) &&
!IsAnyCreation(recursive, semanticModel, cancellationToken).IsEither(Result.Yes, Result.AssumeYes));
}
return(false);
}
/// <summary>
/// Check if any path returns a created IDisposable.
/// </summary>
internal static Result IsCreation(ExpressionSyntax candidate, SemanticModel semanticModel, CancellationToken cancellationToken)
{
if (candidate == null)
{
return(Result.Unknown);
}
switch (candidate.Kind())
{
case SyntaxKind.NullLiteralExpression:
case SyntaxKind.StringLiteralExpression:
case SyntaxKind.NumericLiteralExpression:
case SyntaxKind.TrueLiteralExpression:
case SyntaxKind.FalseLiteralExpression:
case SyntaxKind.BaseExpression:
case SyntaxKind.ThisExpression:
return(Result.No);
}
if (!IsPotentiallyAssignableFrom(candidate, semanticModel, cancellationToken))
{
return(Result.No);
}
if (candidate is IdentifierNameSyntax identifierName &&
identifierName.Identifier.ValueText == "value" &&
candidate.FirstAncestor <AccessorDeclarationSyntax>() is AccessorDeclarationSyntax accessor &&
accessor.IsKind(SyntaxKind.SetAccessorDeclaration))
{
return(Result.No);
}
if (candidate is ObjectCreationExpressionSyntax)
{
return(Result.Yes);
}
using (var recursive = RecursiveValues.Borrow(new[] { candidate }, semanticModel, cancellationToken))
{
return(IsAnyCreation(recursive, semanticModel, cancellationToken));
}
}
internal static Result IsAnyCachedOrInjected(RecursiveValues values, SemanticModel semanticModel, CancellationToken cancellationToken)
{
if (values.IsEmpty)
{
return(Result.No);
}
var result = Result.No;
values.Reset();
while (values.MoveNext())
{
if (values.Current is ElementAccessExpressionSyntax elementAccess &&
semanticModel.TryGetSymbol(elementAccess.Expression, cancellationToken, out var symbol))
{
var isInjected = IsInjectedCore(symbol);
if (isInjected == Result.Yes)
{
return(Result.Yes);
}
if (isInjected == Result.AssumeYes)
{
result = Result.AssumeYes;
}
using var assignedValues = AssignedValueWalker.Borrow(values.Current, semanticModel, cancellationToken);
using var recursive = RecursiveValues.Borrow(assignedValues, semanticModel, cancellationToken);
isInjected = IsAnyCachedOrInjected(recursive, semanticModel, cancellationToken);
if (isInjected == Result.Yes)
{
return(Result.Yes);
}
if (isInjected == Result.AssumeYes)
{
result = Result.AssumeYes;
}
}
internal static bool IsCachedOrInjected(ExpressionSyntax value, ExpressionSyntax location, SemanticModel semanticModel, CancellationToken cancellationToken)
{
var symbol = semanticModel.GetSymbolSafe(value, cancellationToken);
if (IsInjectedCore(symbol).IsEither(Result.Yes, Result.AssumeYes))
{
return(true);
}
if (symbol is IPropertySymbol property &&
!property.IsAutoProperty())
{
using (var returnValues = ReturnValueWalker.Borrow(value, ReturnValueSearch.TopLevel, semanticModel, cancellationToken))
{
using (var recursive = RecursiveValues.Borrow(returnValues, semanticModel, cancellationToken))
{
return(IsAnyCachedOrInjected(recursive, semanticModel, cancellationToken).IsEither(Result.Yes, Result.AssumeYes));
}
}
}
return(IsAssignedWithInjected(symbol, location, semanticModel, cancellationToken));
}
internal static Result IsAlreadyAssignedWithCreated(ExpressionSyntax disposable, SemanticModel semanticModel, CancellationToken cancellationToken, out ISymbol assignedSymbol)
{
if (!IsPotentiallyAssignableFrom(disposable, semanticModel, cancellationToken))
{
assignedSymbol = null;
return(Result.No);
}
var symbol = semanticModel.GetSymbolSafe(disposable, cancellationToken);
if (symbol is IPropertySymbol property &&
IsAssignableFrom(property.Type, semanticModel.Compilation) &&
property.TryGetSetter(cancellationToken, out var setter) &&
(setter.ExpressionBody != null || setter.Body != null))
{
using (var assignedSymbols = PooledSet <ISymbol> .Borrow())
{
using (var pooledAssigned = AssignmentExecutionWalker.Borrow(setter, Scope.Recursive, semanticModel, cancellationToken))
{
foreach (var assigned in pooledAssigned.Assignments)
{
if (assigned.Right is IdentifierNameSyntax identifierName &&
identifierName.Identifier.ValueText == "value" &&
IsPotentiallyAssignableFrom(assigned.Left, semanticModel, cancellationToken) &&
semanticModel.GetSymbolSafe(assigned.Left, cancellationToken) is ISymbol candidate &&
candidate.IsEitherKind(SymbolKind.Field, SymbolKind.Property))
{
assignedSymbols.Add(candidate);
}
}
}
assignedSymbol = null;
var result = Result.No;
foreach (var candidate in assignedSymbols)
{
switch (IsAssignedWithCreated(candidate, disposable, semanticModel, cancellationToken))
{
case Result.Unknown:
if (result == Result.No)
{
assignedSymbol = candidate;
result = Result.Unknown;
}
break;
case Result.Yes:
assignedSymbol = candidate;
return(Result.Yes);
case Result.AssumeYes:
assignedSymbol = candidate;
result = Result.AssumeYes;
break;
case Result.No:
case Result.AssumeNo:
break;
default:
throw new ArgumentOutOfRangeException();
}
}
return(result);
}
}
if (symbol is IParameterSymbol parameter &&
disposable.TryFirstAncestor <ArrowExpressionClauseSyntax>(out _))
{
assignedSymbol = null;
return(Result.No);
}
using (var assignedValues = AssignedValueWalker.Borrow(disposable, semanticModel, cancellationToken))
{
assignedSymbol = assignedValues.CurrentSymbol;
if (assignedValues.Count == 1 &&
disposable.Parent is AssignmentExpressionSyntax assignment)
{
if (assignment.Parent is ParenthesizedExpressionSyntax parenthesizedExpression &&
parenthesizedExpression.Parent is BinaryExpressionSyntax binary &&
binary.IsKind(SyntaxKind.CoalesceExpression))
{
// lazy
return(Result.No);
}
}
if (symbol.IsEither <IParameterSymbol, ILocalSymbol>())
{
assignedValues.RemoveAll(x => IsReturnedBefore(x));
}
using (var recursive = RecursiveValues.Borrow(assignedValues, semanticModel, cancellationToken))
{
return(IsAnyCreation(recursive, semanticModel, cancellationToken));
}
}
bool IsReturnedBefore(ExpressionSyntax expression)
{
if (expression.TryFirstAncestor(out BlockSyntax block) &&
block.Statements.TryFirstOfType(out ReturnStatementSyntax _))
{
if (expression.TryFirstAncestor <ForEachStatementSyntax>(out _) ||
expression.TryFirstAncestor <ForStatementSyntax>(out _) ||
expression.TryFirstAncestor <WhileStatementSyntax>(out _))
{
return(true);
}
return(!block.Contains(disposable) &&
block.SharesAncestor(disposable, out MemberDeclarationSyntax _));
}
return(false);
}
}