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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.
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
namespace Microsoft.CodeAnalysis.FlowAnalysis;
internal static partial class ControlFlowGraphExtensions
{
public static BasicBlock EntryBlock(this ControlFlowGraph cfg)
{
var firstBlock = cfg.Blocks[0];
Debug.Assert(firstBlock.Kind == BasicBlockKind.Entry);
return firstBlock;
}
public static BasicBlock ExitBlock(this ControlFlowGraph cfg)
{
var lastBlock = cfg.Blocks.Last();
Debug.Assert(lastBlock.Kind == BasicBlockKind.Exit);
return lastBlock;
}
public static IEnumerable<IOperation> DescendantOperations(this ControlFlowGraph cfg)
=> cfg.Blocks.SelectMany(b => b.DescendantOperations());
public static IEnumerable<T> DescendantOperations<T>(this ControlFlowGraph cfg, OperationKind operationKind)
where T : IOperation
=> cfg.DescendantOperations().Where(d => d?.Kind == operationKind).Cast<T>();
}
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