mirror of
https://github.com/sp-tarkov/assembly-tool.git
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Archangel
77a24319b1
Adds the source code used for this modification, this de4dot source code has been cleaned of any things not needed for deobfuscating the tarkov assembly Co-authored-by: 静穏靄 <170472707+seionmoya@users.noreply.github.com>
329 lines
10 KiB
C#
329 lines
10 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.Collections.Generic;
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using System.Reflection;
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using System.Reflection.Emit;
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using dnlib.DotNet.Emit;
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using dnlib.DotNet;
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using OpCode = dnlib.DotNet.Emit.OpCode;
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using OpCodes = dnlib.DotNet.Emit.OpCodes;
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using OperandType = dnlib.DotNet.Emit.OperandType;
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using ROpCode = System.Reflection.Emit.OpCode;
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using ROpCodes = System.Reflection.Emit.OpCodes;
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namespace AssemblyData.methodsrewriter {
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class CodeGenerator {
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static Dictionary<OpCode, ROpCode> dnlibToReflection = new Dictionary<OpCode, ROpCode>();
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static CodeGenerator() {
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var refDict = new Dictionary<short, ROpCode>(0x100);
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foreach (var f in typeof(ROpCodes).GetFields(BindingFlags.Static | BindingFlags.Public)) {
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if (f.FieldType != typeof(ROpCode))
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continue;
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var ropcode = (ROpCode)f.GetValue(null);
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refDict[ropcode.Value] = ropcode;
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}
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foreach (var f in typeof(OpCodes).GetFields(BindingFlags.Static | BindingFlags.Public)) {
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if (f.FieldType != typeof(OpCode))
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continue;
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var opcode = (OpCode)f.GetValue(null);
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if (!refDict.TryGetValue(opcode.Value, out var ropcode))
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continue;
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dnlibToReflection[opcode] = ropcode;
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}
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}
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IMethodsRewriter methodsRewriter;
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string methodName;
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IList<Instruction> allInstructions;
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IList<dnlib.DotNet.Emit.ExceptionHandler> allExceptionHandlers;
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ILGenerator ilg;
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Type methodReturnType;
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Type[] methodParameters;
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Type delegateType;
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MMethod methodInfo;
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LocalBuilder tempObjLocal;
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LocalBuilder tempObjArrayLocal;
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int thisArgIndex;
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List<LocalBuilder> locals;
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List<Label> labels;
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Dictionary<Instruction, int> instrToIndex;
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Stack<dnlib.DotNet.Emit.ExceptionHandler> exceptionHandlersStack;
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public Type DelegateType => delegateType;
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public CodeGenerator(IMethodsRewriter methodsRewriter, string methodName) {
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this.methodsRewriter = methodsRewriter;
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this.methodName = methodName;
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}
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public void SetMethodInfo(MMethod methodInfo) {
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this.methodInfo = methodInfo;
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methodReturnType = ResolverUtils.GetReturnType(methodInfo.methodBase);
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methodParameters = GetMethodParameterTypes(methodInfo.methodBase);
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delegateType = Utils.GetDelegateType(methodReturnType, methodParameters);
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}
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public Delegate Generate(IList<Instruction> allInstructions, IList<dnlib.DotNet.Emit.ExceptionHandler> allExceptionHandlers) {
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this.allInstructions = allInstructions;
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this.allExceptionHandlers = allExceptionHandlers;
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var dm = new DynamicMethod(methodName, methodReturnType, methodParameters, methodInfo.methodBase.Module, true);
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var lastInstr = allInstructions[allInstructions.Count - 1];
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ilg = dm.GetILGenerator((int)lastInstr.Offset + lastInstr.GetSize());
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InitInstrToIndex();
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InitLocals();
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InitLabels();
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exceptionHandlersStack = new Stack<dnlib.DotNet.Emit.ExceptionHandler>();
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for (int i = 0; i < allInstructions.Count; i++) {
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UpdateExceptionHandlers(i);
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var instr = allInstructions[i];
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ilg.MarkLabel(labels[i]);
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if (instr.Operand is Operand)
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WriteSpecialInstr(instr, (Operand)instr.Operand);
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else
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WriteInstr(instr);
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}
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UpdateExceptionHandlers(-1);
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return dm.CreateDelegate(delegateType);
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}
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Instruction GetExceptionInstruction(int instructionIndex) => instructionIndex < 0 ? null : allInstructions[instructionIndex];
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void UpdateExceptionHandlers(int instructionIndex) {
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var instr = GetExceptionInstruction(instructionIndex);
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UpdateExceptionHandlers(instr);
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if (AddTryStart(instr))
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UpdateExceptionHandlers(instr);
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}
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void UpdateExceptionHandlers(Instruction instr) {
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while (exceptionHandlersStack.Count > 0) {
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var ex = exceptionHandlersStack.Peek();
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if (ex.TryEnd == instr) {
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}
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if (ex.FilterStart == instr) {
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}
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if (ex.HandlerStart == instr) {
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if (ex.HandlerType == ExceptionHandlerType.Finally)
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ilg.BeginFinallyBlock();
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else
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ilg.BeginCatchBlock(Resolver.GetRtType(ex.CatchType));
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}
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if (ex.HandlerEnd == instr) {
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exceptionHandlersStack.Pop();
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if (exceptionHandlersStack.Count == 0 || !IsSameTryBlock(ex, exceptionHandlersStack.Peek()))
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ilg.EndExceptionBlock();
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}
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else
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break;
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}
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}
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bool AddTryStart(Instruction instr) {
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var list = new List<dnlib.DotNet.Emit.ExceptionHandler>();
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foreach (var ex in allExceptionHandlers) {
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if (ex.TryStart == instr)
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list.Add(ex);
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}
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list.Reverse();
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foreach (var ex in list) {
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if (exceptionHandlersStack.Count == 0 || !IsSameTryBlock(ex, exceptionHandlersStack.Peek()))
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ilg.BeginExceptionBlock();
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exceptionHandlersStack.Push(ex);
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}
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return list.Count > 0;
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}
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static bool IsSameTryBlock(dnlib.DotNet.Emit.ExceptionHandler ex1, dnlib.DotNet.Emit.ExceptionHandler ex2) => ex1.TryStart == ex2.TryStart && ex1.TryEnd == ex2.TryEnd;
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void InitInstrToIndex() {
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instrToIndex = new Dictionary<Instruction, int>(allInstructions.Count);
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for (int i = 0; i < allInstructions.Count; i++)
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instrToIndex[allInstructions[i]] = i;
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}
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void InitLocals() {
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locals = new List<LocalBuilder>();
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foreach (var local in methodInfo.methodDef.Body.Variables)
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locals.Add(ilg.DeclareLocal(Resolver.GetRtType(local.Type), local.Type.RemoveModifiers().IsPinned));
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tempObjLocal = ilg.DeclareLocal(typeof(object));
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tempObjArrayLocal = ilg.DeclareLocal(typeof(object[]));
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}
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void InitLabels() {
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labels = new List<Label>(allInstructions.Count);
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for (int i = 0; i < allInstructions.Count; i++)
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labels.Add(ilg.DefineLabel());
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}
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Type[] GetMethodParameterTypes(MethodBase method) {
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var list = new List<Type>();
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if (ResolverUtils.HasThis(method))
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list.Add(method.DeclaringType);
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foreach (var param in method.GetParameters())
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list.Add(param.ParameterType);
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thisArgIndex = list.Count;
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list.Add(methodsRewriter.GetType());
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return list.ToArray();
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}
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void WriteSpecialInstr(Instruction instr, Operand operand) {
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BindingFlags flags;
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switch (operand.type) {
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case Operand.Type.ThisArg:
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ilg.Emit(ConvertOpCode(instr.OpCode), (short)thisArgIndex);
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break;
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case Operand.Type.TempObj:
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ilg.Emit(ConvertOpCode(instr.OpCode), tempObjLocal);
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break;
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case Operand.Type.TempObjArray:
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ilg.Emit(ConvertOpCode(instr.OpCode), tempObjArrayLocal);
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break;
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case Operand.Type.OurMethod:
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flags = BindingFlags.DeclaredOnly | BindingFlags.Instance | BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Public;
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var methodName = (string)operand.data;
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var ourMethod = methodsRewriter.GetType().GetMethod(methodName, flags);
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if (ourMethod == null)
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throw new ApplicationException($"Could not find method {methodName}");
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ilg.Emit(ConvertOpCode(instr.OpCode), ourMethod);
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break;
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case Operand.Type.NewMethod:
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var methodBase = (MethodBase)operand.data;
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var delegateType = methodsRewriter.GetDelegateType(methodBase);
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flags = BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.Instance;
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var invokeMethod = delegateType.GetMethod("Invoke", flags);
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ilg.Emit(ConvertOpCode(instr.OpCode), invokeMethod);
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break;
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case Operand.Type.ReflectionType:
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ilg.Emit(ConvertOpCode(instr.OpCode), (Type)operand.data);
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break;
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default:
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throw new ApplicationException($"Unknown operand type: {operand.type}");
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}
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}
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Label GetLabel(Instruction target) => labels[instrToIndex[target]];
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Label[] GetLabels(Instruction[] targets) {
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var labels = new Label[targets.Length];
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for (int i = 0; i < labels.Length; i++)
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labels[i] = GetLabel(targets[i]);
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return labels;
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}
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void WriteInstr(Instruction instr) {
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var opcode = ConvertOpCode(instr.OpCode);
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switch (instr.OpCode.OperandType) {
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case OperandType.InlineNone:
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ilg.Emit(opcode);
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break;
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case OperandType.InlineBrTarget:
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case OperandType.ShortInlineBrTarget:
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ilg.Emit(opcode, GetLabel((Instruction)instr.Operand));
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break;
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case OperandType.InlineSwitch:
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ilg.Emit(opcode, GetLabels((Instruction[])instr.Operand));
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break;
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case OperandType.ShortInlineI:
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if (instr.OpCode.Code == Code.Ldc_I4_S)
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ilg.Emit(opcode, (sbyte)instr.Operand);
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else
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ilg.Emit(opcode, (byte)instr.Operand);
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break;
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case OperandType.InlineI:
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ilg.Emit(opcode, (int)instr.Operand);
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break;
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case OperandType.InlineI8:
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ilg.Emit(opcode, (long)instr.Operand);
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break;
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case OperandType.InlineR:
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ilg.Emit(opcode, (double)instr.Operand);
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break;
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case OperandType.ShortInlineR:
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ilg.Emit(opcode, (float)instr.Operand);
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break;
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case OperandType.InlineString:
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ilg.Emit(opcode, (string)instr.Operand);
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break;
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case OperandType.InlineTok:
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case OperandType.InlineType:
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case OperandType.InlineMethod:
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case OperandType.InlineField:
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var obj = Resolver.GetRtObject((ITokenOperand)instr.Operand);
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if (obj is ConstructorInfo)
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ilg.Emit(opcode, (ConstructorInfo)obj);
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else if (obj is MethodInfo)
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ilg.Emit(opcode, (MethodInfo)obj);
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else if (obj is FieldInfo)
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ilg.Emit(opcode, (FieldInfo)obj);
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else if (obj is Type)
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ilg.Emit(opcode, (Type)obj);
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else
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throw new ApplicationException($"Unknown type: {(obj == null ? obj : obj.GetType())}");
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break;
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case OperandType.InlineVar:
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ilg.Emit(opcode, checked((short)((IVariable)instr.Operand).Index));
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break;
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case OperandType.ShortInlineVar:
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ilg.Emit(opcode, checked((byte)((IVariable)instr.Operand).Index));
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break;
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case OperandType.InlineSig: //TODO:
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default:
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throw new ApplicationException($"Unknown OperandType {instr.OpCode.OperandType}");
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}
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}
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ROpCode ConvertOpCode(OpCode opcode) {
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if (dnlibToReflection.TryGetValue(opcode, out var ropcode))
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return ropcode;
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return ROpCodes.Nop;
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}
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}
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}
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