95 lines
3.3 KiB
C#
95 lines
3.3 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;
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using System.Reflection;
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using System.Diagnostics;
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namespace de4dot.blocks {
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public class StackTracePatcher {
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static readonly FieldInfo methodField;
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static readonly FieldInfo framesField;
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static readonly FieldInfo methodsToSkipField;
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static StackTracePatcher() {
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methodField = GetStackFrameMethodField();
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framesField = GetStackTraceStackFramesField();
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methodsToSkipField = GetMethodsToSkipField();
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}
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static FieldInfo GetStackFrameMethodField() {
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var flags = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance;
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return GetFieldThrow(typeof(StackFrame), typeof(MethodBase), flags, "Could not find StackFrame's method (MethodBase) field");
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}
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static FieldInfo GetStackTraceStackFramesField() {
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var flags = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance;
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return GetFieldThrow(typeof(StackTrace), typeof(StackFrame[]), flags, "Could not find StackTrace's frames (StackFrame[]) field");
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}
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static FieldInfo GetMethodsToSkipField() {
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var flags = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance;
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return GetFieldThrow(typeof(StackTrace), "m_iMethodsToSkip", flags, "Could not find StackTrace's iMethodsToSkip field");
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}
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static FieldInfo GetFieldThrow(Type type, Type fieldType, BindingFlags flags, string msg) {
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var info = GetField(type, fieldType, flags);
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if (info != null)
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return info;
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throw new ApplicationException(msg);
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}
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static FieldInfo GetField(Type type, Type fieldType, BindingFlags flags) {
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foreach (var field in type.GetFields(flags)) {
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if (field.FieldType == fieldType)
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return field;
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}
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return null;
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}
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static FieldInfo GetFieldThrow(Type type, string fieldName, BindingFlags flags, string msg) {
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var info = GetField(type, fieldName, flags);
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if (info != null)
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return info;
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throw new ApplicationException(msg);
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}
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static FieldInfo GetField(Type type, string fieldName, BindingFlags flags) {
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foreach (var field in type.GetFields(flags)) {
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if (field.Name == fieldName)
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return field;
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}
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return null;
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}
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public static StackTrace WriteStackFrame(StackTrace stackTrace, int frameNo, MethodBase newMethod) {
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var frames = (StackFrame[])framesField.GetValue(stackTrace);
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int numFramesToSkip = (int)methodsToSkipField.GetValue(stackTrace);
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WriteMethodBase(frames[numFramesToSkip + frameNo], newMethod);
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return stackTrace;
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}
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static void WriteMethodBase(StackFrame frame, MethodBase method) {
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methodField.SetValue(frame, method);
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if (frame.GetMethod() != method)
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throw new ApplicationException(string.Format("Could not set new method: {0}", method));
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}
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}
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}
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