91 lines
2.6 KiB
C#
91 lines
2.6 KiB
C#
/*
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Copyright (C) 2011-2015 de4dot@gmail.com
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This file is part of de4dot.
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de4dot is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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de4dot is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with de4dot. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System.Collections.Generic;
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using dnlib.DotNet;
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using dnlib.DotNet.Emit;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators {
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public class UnusedMethodsFinder {
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ModuleDef module;
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MethodCollection removedMethods;
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Dictionary<MethodDef, bool> possiblyUnusedMethods = new Dictionary<MethodDef, bool>();
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Stack<MethodDef> notUnusedStack = new Stack<MethodDef>();
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public UnusedMethodsFinder(ModuleDef module, IEnumerable<MethodDef> possiblyUnusedMethods, MethodCollection removedMethods) {
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this.module = module;
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this.removedMethods = removedMethods;
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foreach (var method in possiblyUnusedMethods) {
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if (method != module.ManagedEntryPoint && !removedMethods.Exists(method))
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this.possiblyUnusedMethods[method] = true;
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}
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}
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public IEnumerable<MethodDef> Find() {
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if (possiblyUnusedMethods.Count == 0)
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return possiblyUnusedMethods.Keys;
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foreach (var type in module.GetTypes()) {
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foreach (var method in type.Methods)
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Check(method);
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}
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while (notUnusedStack.Count > 0) {
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var method = notUnusedStack.Pop();
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if (!possiblyUnusedMethods.Remove(method))
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continue;
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Check(method);
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}
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return possiblyUnusedMethods.Keys;
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}
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void Check(MethodDef method) {
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if (method.Body == null)
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return;
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if (possiblyUnusedMethods.ContainsKey(method))
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return;
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if (removedMethods.Exists(method))
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return;
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foreach (var instr in method.Body.Instructions) {
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switch (instr.OpCode.Code) {
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case Code.Call:
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case Code.Calli:
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case Code.Callvirt:
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case Code.Newobj:
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case Code.Ldtoken:
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case Code.Ldftn:
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case Code.Ldvirtftn:
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break;
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default:
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continue;
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}
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var calledMethod = DotNetUtils.GetMethod2(module, instr.Operand as IMethod);
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if (calledMethod == null)
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continue;
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if (possiblyUnusedMethods.ContainsKey(calledMethod))
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notUnusedStack.Push(calledMethod);
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}
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}
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}
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}
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