private static Result IsCreationCore(RecursiveValues values, SemanticModel semanticModel, CancellationToken cancellationToken)
{
values.Reset();
var result = Result.No;
while (values.MoveNext())
{
switch (IsCreationCore(values.Current, semanticModel, cancellationToken))
{
case Result.Unknown:
if (result == Result.No)
{
result = Result.Unknown;
}
break;
case Result.Yes:
return(Result.Yes);
case Result.No:
break;
case Result.Maybe:
result = Result.Maybe;
break;
default:
throw new ArgumentOutOfRangeException();
}
}
return(result);
}
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));
}
}
}
/// <summary>
/// Check if any path returns a created IDisposable
/// </summary>
internal static Result IsCreation(ExpressionSyntax candidate, SemanticModel semanticModel, CancellationToken cancellationToken)
{
if (!IsPotentiallyAssignableTo(candidate, semanticModel, cancellationToken) ||
candidate is ThisExpressionSyntax ||
candidate is BaseExpressionSyntax)
{
return(Result.No);
}
using (var pooled = ReturnValueWalker.Create(candidate, Search.Recursive, semanticModel, cancellationToken))
{
if (pooled.Item.Count == 0)
{
var symbol = semanticModel.GetSymbolSafe(candidate, cancellationToken);
if (symbol != null && symbol.DeclaringSyntaxReferences.Length == 0)
{
return(IsCreationCore(candidate, semanticModel, cancellationToken));
}
using (var recursive = RecursiveValues.Create(new[] { candidate }, semanticModel, cancellationToken))
{
return(IsCreationCore(recursive, semanticModel, cancellationToken));
}
}
using (var recursive = RecursiveValues.Create(pooled.Item, semanticModel, cancellationToken))
{
return(IsCreationCore(recursive, semanticModel, cancellationToken));
}
}
}
private static Result IsAssignedWithCreated(RecursiveValues walker, SemanticModel semanticModel, CancellationToken cancellationToken)
{
if (walker.Count == 0)
{
return(Result.No);
}
return(IsCreationCore(walker, semanticModel, cancellationToken));
}
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));
}
}
}
/// <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);
}
/// <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));
}
}
}
