icsharpcode-ILSpy/ILSpy/TreeNodes/Analyzer/AnalyzedMethodUsedByTreeNode.cs

// Copyright (c) 2011 AlphaSierraPapa for the SharpDevelop Team
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// DEALINGS IN THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using ICSharpCode.NRefactory.Utils;
using ICSharpCode.TreeView;
using Mono.Cecil;
using Mono.Cecil.Cil;

namespace ICSharpCode.ILSpy.TreeNodes.Analyzer
{
	class AnalyzedMethodUsedByTreeNode : AnalyzerTreeNode
	{
		MethodDefinition analyzedMethod;
		ThreadingSupport threading;
		
		public AnalyzedMethodUsedByTreeNode(MethodDefinition analyzedMethod)
		{
			if (analyzedMethod == null)
				throw new ArgumentNullException("analyzedMethod");
			
			this.analyzedMethod = analyzedMethod;
			this.threading = new ThreadingSupport();
			this.LazyLoading = true;
		}
		
		public override object Text {
			get { return "Used By"; }
		}
		
		public override object Icon {
			get { return Images.Search; }
		}
		
		protected override void LoadChildren()
		{
			threading.LoadChildren(this, FetchChildren);
		}
		
		protected override void OnCollapsing()
		{
			if (threading.IsRunning) {
				this.LazyLoading = true;
				threading.Cancel();
				this.Children.Clear();
			}
		}
		
		IEnumerable<SharpTreeNode> FetchChildren(CancellationToken ct)
		{
			return FindReferences(MainWindow.Instance.CurrentAssemblyList.GetAssemblies(), ct);
		}
		
		IEnumerable<SharpTreeNode> FindReferences(IEnumerable<LoadedAssembly> assemblies, CancellationToken ct)
		{
			assemblies = assemblies.Where(asm => asm.AssemblyDefinition != null);
			// use parallelism only on the assembly level (avoid locks within Cecil)
			return assemblies.AsParallel().WithCancellation(ct).SelectMany((LoadedAssembly asm) => FindReferences(asm, ct));
		}
		
		IEnumerable<SharpTreeNode> FindReferences(LoadedAssembly asm, CancellationToken ct)
		{
			string name = analyzedMethod.Name;
			string declTypeName = analyzedMethod.DeclaringType.FullName;
			foreach (TypeDefinition type in TreeTraversal.PreOrder(asm.AssemblyDefinition.MainModule.Types, t => t.NestedTypes)) {
				ct.ThrowIfCancellationRequested();
				foreach (MethodDefinition method in type.Methods) {
					ct.ThrowIfCancellationRequested();
					bool found = false;
					if (!method.HasBody)
						continue;
					foreach (Instruction instr in method.Body.Instructions) {
						MethodReference mr = instr.Operand as MethodReference;
						if (mr != null && mr.Name == name && mr.DeclaringType.FullName == declTypeName && mr.Resolve() == analyzedMethod) {
							found = true;
							break;
						}
					}
					if (found)
						yield return new AnalyzedMethodTreeNode(method);
				}
			}
		}
	}
}