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OperationWalker.cs
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OperationWalker.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
namespace Microsoft.CodeAnalysis.Operations
{
/// <summary>
/// Represents a <see cref="OperationVisitor"/> that descends an entire <see cref="IOperation"/> tree
/// visiting each IOperation and its child IOperation nodes in depth-first order.
/// </summary>
public abstract class OperationWalker : OperationVisitor
{
private int _recursionDepth;
private void VisitChildOperations(IOperation operation)
{
foreach (var child in ((Operation)operation).ChildOperations)
{
Visit(child);
}
}
public override void Visit(IOperation? operation)
{
if (operation != null)
{
_recursionDepth++;
try
{
StackGuard.EnsureSufficientExecutionStack(_recursionDepth);
operation.Accept(this);
}
finally
{
_recursionDepth--;
}
}
}
public override void DefaultVisit(IOperation operation)
{
VisitChildOperations(operation);
}
internal override void VisitNoneOperation(IOperation operation)
{
VisitChildOperations(operation);
}
}
/// <summary>
/// Represents a <see cref="OperationVisitor{TArgument, TResult}"/> that descends an entire <see cref="IOperation"/> tree
/// visiting each IOperation and its child IOperation nodes in depth-first order. Returns null.
/// </summary>
public abstract class OperationWalker<TArgument> : OperationVisitor<TArgument, object?>
{
private int _recursionDepth;
private void VisitChildrenOperations(IOperation operation, TArgument argument)
{
foreach (var child in ((Operation)operation).ChildOperations)
{
Visit(child, argument);
}
}
public override object? Visit(IOperation? operation, TArgument argument)
{
if (operation != null)
{
_recursionDepth++;
try
{
StackGuard.EnsureSufficientExecutionStack(_recursionDepth);
operation.Accept(this, argument);
}
finally
{
_recursionDepth--;
}
}
return null;
}
public override object? DefaultVisit(IOperation operation, TArgument argument)
{
VisitChildrenOperations(operation, argument);
return null;
}
internal override object? VisitNoneOperation(IOperation operation, TArgument argument)
{
VisitChildrenOperations(operation, argument);
return null;
}
}
}