2011-11-01 02:40:57 +08:00
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/*
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Copyright (C) 2011 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 Mono.Cecil;
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using Mono.Cecil.Cil;
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using de4dot.blocks;
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namespace de4dot.deobfuscators {
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// Restore the type of all fields / parameters that have had their type turned into object.
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// This thing requires a lot more code than I have time to do now (similar to symbol renaming)
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// so it will be a basic implementation only.
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class TypesRestorer {
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ModuleDefinition module;
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2011-11-01 06:58:19 +08:00
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List<MethodDefinition> allMethods;
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2011-11-01 09:22:05 +08:00
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Dictionary<ParameterDefinition, TypeInfo<ParameterDefinition>> argInfos = new Dictionary<ParameterDefinition, TypeInfo<ParameterDefinition>>();
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List<TypeInfo<ParameterDefinition>> changedArgInfos = new List<TypeInfo<ParameterDefinition>>();
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List<TypeInfo<ParameterDefinition>> changedReturnTypes = new List<TypeInfo<ParameterDefinition>>();
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TypeInfo<ParameterDefinition> methodReturnInfo;
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Dictionary<FieldReferenceAndDeclaringTypeKey, TypeInfo<FieldDefinition>> fieldWrites = new Dictionary<FieldReferenceAndDeclaringTypeKey, TypeInfo<FieldDefinition>>();
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2011-11-01 02:40:57 +08:00
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2011-11-01 09:22:05 +08:00
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class TypeInfo<T> {
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2011-11-01 06:58:19 +08:00
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public Dictionary<TypeReferenceKey, bool> types = new Dictionary<TypeReferenceKey, bool>();
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public TypeReference newType = null;
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2011-11-01 09:22:05 +08:00
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public T arg;
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2011-11-01 06:58:19 +08:00
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2011-11-01 09:22:05 +08:00
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public TypeInfo(T arg) {
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2011-11-01 06:58:19 +08:00
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this.arg = arg;
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}
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2011-11-01 09:22:05 +08:00
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public bool updateNewType() {
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if (types.Count == 0)
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return false;
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TypeReference theNewType = null;
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foreach (var key in types.Keys) {
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if (theNewType == null) {
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theNewType = key.TypeReference;
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continue;
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}
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theNewType = getCommonBaseClass(theNewType, key.TypeReference);
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if (theNewType == null)
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break;
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}
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if (theNewType == null)
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return false;
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if (MemberReferenceHelper.compareTypes(theNewType, newType))
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return false;
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2011-11-01 02:40:57 +08:00
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2011-11-01 09:22:05 +08:00
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newType = theNewType;
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return true;
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2011-11-01 02:40:57 +08:00
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}
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}
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public TypesRestorer(ModuleDefinition module) {
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this.module = module;
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}
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public void deobfuscate() {
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2011-11-01 06:58:19 +08:00
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allMethods = new List<MethodDefinition>();
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foreach (var type in module.GetTypes())
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allMethods.AddRange(type.Methods);
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2011-11-01 02:40:57 +08:00
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foreach (var type in module.GetTypes()) {
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foreach (var field in type.Fields) {
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if (!MemberReferenceHelper.isSystemObject(field.FieldType))
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continue;
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var key = new FieldReferenceAndDeclaringTypeKey(field);
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2011-11-01 09:22:05 +08:00
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fieldWrites[key] = new TypeInfo<FieldDefinition>(field);
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2011-11-01 02:40:57 +08:00
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}
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}
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for (int i = 0; i < 10; i++) {
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2011-11-01 06:58:19 +08:00
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bool changed = false;
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changed |= deobfuscateFields();
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changed |= deobfuscateMethods();
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if (!changed)
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2011-11-01 02:40:57 +08:00
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break;
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}
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2011-11-01 06:58:19 +08:00
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}
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bool deobfuscateMethods() {
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changedArgInfos.Clear();
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2011-11-01 09:22:05 +08:00
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changedReturnTypes.Clear();
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2011-11-01 06:58:19 +08:00
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foreach (var method in allMethods) {
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2011-11-01 09:22:05 +08:00
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methodReturnInfo = new TypeInfo<ParameterDefinition>(method.MethodReturnType.Parameter2);
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2011-11-01 06:58:19 +08:00
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deobfuscateMethod(method);
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2011-11-01 09:22:05 +08:00
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if (methodReturnInfo.updateNewType())
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changedReturnTypes.Add(methodReturnInfo);
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2011-11-01 06:58:19 +08:00
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2011-11-01 09:22:05 +08:00
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foreach (var info in argInfos.Values) {
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if (info.updateNewType())
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changedArgInfos.Add(info);
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2011-11-01 06:58:19 +08:00
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}
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}
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2011-11-01 09:22:05 +08:00
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if (changedArgInfos.Count == 0 && changedReturnTypes.Count == 0)
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2011-11-01 06:58:19 +08:00
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return false;
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2011-11-01 09:22:05 +08:00
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changedArgInfos.Sort((a, b) => sortTypeInfos(a, b));
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changedReturnTypes.Sort((a, b) => sortTypeInfos(a, b));
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2011-11-01 06:58:19 +08:00
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2011-11-01 09:22:05 +08:00
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bool changed = false;
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2011-11-01 06:58:19 +08:00
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2011-11-01 09:22:05 +08:00
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if (changedArgInfos.Count > 0) {
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Log.v("Changing method arg types from object -> real type");
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Log.indent();
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IMethodSignature updatedMethod = null;
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Log.indent();
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foreach (var info in changedArgInfos) {
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if (info.newType == null || MemberReferenceHelper.isSystemObject(info.newType))
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continue;
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2011-11-01 06:58:19 +08:00
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2011-11-01 09:22:05 +08:00
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if (updatedMethod == null || updatedMethod != info.arg.Method) {
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updatedMethod = info.arg.Method;
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Log.deIndent();
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Log.v("Method {0:X8}", updatedMethod.MetadataToken.ToInt32());
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Log.indent();
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}
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Log.v("{0}: new type: {1} ({2:X8})", info.arg.Index, info.newType, info.newType.MetadataToken.ToInt32());
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info.arg.ParameterType = info.newType;
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changed = true;
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}
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Log.deIndent();
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Log.deIndent();
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}
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2011-11-01 06:58:19 +08:00
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2011-11-01 09:22:05 +08:00
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if (changedReturnTypes.Count > 0) {
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Log.v("Changing method return types from object -> real type");
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Log.indent();
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foreach (var info in changedReturnTypes) {
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if (info.newType == null || MemberReferenceHelper.isSystemObject(info.newType))
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continue;
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Log.v("{0:X8}: new type {1} ({2:X8})", info.arg.Method.MetadataToken.ToInt32(), info.newType, info.newType.MetadataToken.ToInt32());
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info.arg.Method.MethodReturnType.ReturnType = info.newType;
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info.arg.ParameterType = info.newType;
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changed = true;
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2011-11-01 06:58:19 +08:00
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}
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2011-11-01 09:22:05 +08:00
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Log.deIndent();
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2011-11-01 06:58:19 +08:00
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}
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2011-11-01 09:22:05 +08:00
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2011-11-01 06:58:19 +08:00
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return changed;
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}
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2011-11-01 09:22:05 +08:00
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static int sortTypeInfos(TypeInfo<ParameterDefinition> a, TypeInfo<ParameterDefinition> b) {
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2011-11-02 01:56:44 +08:00
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if (a.arg.Method.MetadataToken.ToInt32() < b.arg.Method.MetadataToken.ToInt32()) return -1;
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if (a.arg.Method.MetadataToken.ToInt32() > b.arg.Method.MetadataToken.ToInt32()) return 1;
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if (a.arg.Index < b.arg.Index) return -1;
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if (a.arg.Index < b.arg.Index) return 1;
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2011-11-01 09:22:05 +08:00
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return 0;
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}
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2011-11-01 06:58:19 +08:00
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void deobfuscateMethod(MethodDefinition method) {
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if (!method.IsStatic || method.Body == null)
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return;
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2011-11-01 09:22:05 +08:00
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bool fixReturnType = MemberReferenceHelper.isSystemObject(method.MethodReturnType.ReturnType);
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2011-11-01 06:58:19 +08:00
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argInfos.Clear();
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foreach (var arg in method.Parameters) {
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if (arg.ParameterType == null || arg.ParameterType.IsValueType)
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continue;
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if (!MemberReferenceHelper.isSystemObject(arg.ParameterType))
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continue;
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2011-11-01 09:22:05 +08:00
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argInfos[arg] = new TypeInfo<ParameterDefinition>(arg);
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2011-11-01 06:58:19 +08:00
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}
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2011-11-01 09:22:05 +08:00
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if (argInfos.Count == 0 && !fixReturnType)
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2011-11-01 06:58:19 +08:00
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return;
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var methodParams = DotNetUtils.getParameters(method);
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var reversedMethodParams = new List<ParameterDefinition>(methodParams);
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reversedMethodParams.Reverse();
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List<Instruction> args;
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var instructions = method.Body.Instructions;
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for (int i = 0; i < instructions.Count; i++) {
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var instr = instructions[i];
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switch (instr.OpCode.Code) {
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2011-11-01 09:22:05 +08:00
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case Code.Ret:
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if (!fixReturnType)
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break;
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var type = getLoadedType(method, instructions, i);
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if (type == null)
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break;
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methodReturnInfo.types[new TypeReferenceKey(type)] = true;
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break;
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2011-11-01 06:58:19 +08:00
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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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args = getPushedArgInstructions(instructions, i);
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var calledMethod = instr.Operand as MethodReference;
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if (calledMethod == null)
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break;
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var calledMethodParams = DotNetUtils.getParameters(calledMethod);
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for (int j = 0; j < args.Count; j++) {
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int calledMethodParamIndex = calledMethodParams.Count - j - 1;
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var ldInstr = args[j];
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switch (ldInstr.OpCode.Code) {
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case Code.Ldarg:
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case Code.Ldarg_S:
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case Code.Ldarg_0:
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case Code.Ldarg_1:
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case Code.Ldarg_2:
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case Code.Ldarg_3:
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addMethodArgType(getParameter(methodParams, method, ldInstr), DotNetUtils.getParameter(calledMethodParams, calledMethodParamIndex));
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break;
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default:
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break;
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}
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}
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break;
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case Code.Castclass:
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args = getPushedArgInstructions(instructions, i);
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if (args.Count < 1)
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break;
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addMethodArgType(getParameter(methodParams, method, args[0]), instr.Operand as TypeReference);
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break;
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case Code.Stloc:
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case Code.Stloc_S:
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case Code.Stloc_0:
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case Code.Stloc_1:
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case Code.Stloc_2:
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case Code.Stloc_3:
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args = getPushedArgInstructions(instructions, i);
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if (args.Count < 1)
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break;
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addMethodArgType(getParameter(methodParams, method, args[0]), DotNetUtils.getLocalVar(method.Body.Variables, instr));
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break;
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case Code.Stsfld:
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args = getPushedArgInstructions(instructions, i);
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if (args.Count < 1)
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break;
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addMethodArgType(getParameter(methodParams, method, args[0]), instr.Operand as FieldReference);
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break;
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case Code.Stfld:
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args = getPushedArgInstructions(instructions, i);
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if (args.Count >= 1) {
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var field = instr.Operand as FieldReference;
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addMethodArgType(getParameter(methodParams, method, args[0]), field);
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if (args.Count >= 2 && field != null)
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addMethodArgType(getParameter(methodParams, method, args[1]), field.DeclaringType);
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}
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break;
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2011-11-01 22:53:51 +08:00
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case Code.Ldfld:
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case Code.Ldflda:
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args = getPushedArgInstructions(instructions, i);
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if (args.Count < 1)
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break;
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addMethodArgType(getParameter(methodParams, method, args[0]), instr.Operand as FieldReference);
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break;
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2011-11-01 06:58:19 +08:00
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//TODO: For better results, these should be checked:
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case Code.Starg:
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case Code.Starg_S:
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case Code.Ldelema:
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case Code.Ldelem_Any:
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case Code.Ldelem_I:
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case Code.Ldelem_I1:
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case Code.Ldelem_I2:
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case Code.Ldelem_I4:
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case Code.Ldelem_I8:
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case Code.Ldelem_R4:
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case Code.Ldelem_R8:
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|
|
case Code.Ldelem_Ref:
|
|
|
|
|
case Code.Ldelem_U1:
|
|
|
|
|
case Code.Ldelem_U2:
|
|
|
|
|
case Code.Ldelem_U4:
|
|
|
|
|
|
|
|
|
|
case Code.Ldind_I:
|
|
|
|
|
case Code.Ldind_I1:
|
|
|
|
|
case Code.Ldind_I2:
|
|
|
|
|
case Code.Ldind_I4:
|
|
|
|
|
case Code.Ldind_I8:
|
|
|
|
|
case Code.Ldind_R4:
|
|
|
|
|
case Code.Ldind_R8:
|
|
|
|
|
case Code.Ldind_Ref:
|
|
|
|
|
case Code.Ldind_U1:
|
|
|
|
|
case Code.Ldind_U2:
|
|
|
|
|
case Code.Ldind_U4:
|
|
|
|
|
|
|
|
|
|
case Code.Ldobj:
|
|
|
|
|
|
|
|
|
|
case Code.Stelem_Any:
|
|
|
|
|
case Code.Stelem_I:
|
|
|
|
|
case Code.Stelem_I1:
|
|
|
|
|
case Code.Stelem_I2:
|
|
|
|
|
case Code.Stelem_I4:
|
|
|
|
|
case Code.Stelem_I8:
|
|
|
|
|
case Code.Stelem_R4:
|
|
|
|
|
case Code.Stelem_R8:
|
|
|
|
|
case Code.Stelem_Ref:
|
|
|
|
|
|
|
|
|
|
case Code.Stind_I:
|
|
|
|
|
case Code.Stind_I1:
|
|
|
|
|
case Code.Stind_I2:
|
|
|
|
|
case Code.Stind_I4:
|
|
|
|
|
case Code.Stind_I8:
|
|
|
|
|
case Code.Stind_R4:
|
|
|
|
|
case Code.Stind_R8:
|
|
|
|
|
case Code.Stind_Ref:
|
|
|
|
|
|
|
|
|
|
case Code.Stobj:
|
|
|
|
|
default:
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static ParameterDefinition getParameter(IList<ParameterDefinition> parameters, MethodReference method, Instruction instr) {
|
|
|
|
|
switch (instr.OpCode.Code) {
|
|
|
|
|
case Code.Ldarg:
|
|
|
|
|
case Code.Ldarg_S:
|
|
|
|
|
case Code.Ldarg_0:
|
|
|
|
|
case Code.Ldarg_1:
|
|
|
|
|
case Code.Ldarg_2:
|
|
|
|
|
case Code.Ldarg_3:
|
|
|
|
|
return DotNetUtils.getParameter(parameters, method, instr);
|
|
|
|
|
|
|
|
|
|
default:
|
|
|
|
|
return null;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
bool addMethodArgType(ParameterDefinition methodParam, FieldReference field) {
|
|
|
|
|
if (field == null)
|
|
|
|
|
return false;
|
|
|
|
|
return addMethodArgType(methodParam, field.FieldType);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
bool addMethodArgType(ParameterDefinition methodParam, VariableDefinition otherLocal) {
|
|
|
|
|
if (otherLocal == null)
|
|
|
|
|
return false;
|
|
|
|
|
return addMethodArgType(methodParam, otherLocal.VariableType);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
bool addMethodArgType(ParameterDefinition methodParam, ParameterDefinition otherParam) {
|
|
|
|
|
if (otherParam == null)
|
|
|
|
|
return false;
|
|
|
|
|
return addMethodArgType(methodParam, otherParam.ParameterType);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
bool addMethodArgType(ParameterDefinition methodParam, TypeReference type) {
|
|
|
|
|
if (methodParam == null || type == null)
|
|
|
|
|
return false;
|
|
|
|
|
|
2011-11-01 09:22:05 +08:00
|
|
|
|
if (!isValidType(type))
|
2011-11-01 06:58:19 +08:00
|
|
|
|
return false;
|
|
|
|
|
|
2011-11-01 09:22:05 +08:00
|
|
|
|
TypeInfo<ParameterDefinition> info;
|
2011-11-01 06:58:19 +08:00
|
|
|
|
if (!argInfos.TryGetValue(methodParam, out info))
|
|
|
|
|
return false;
|
|
|
|
|
var key = new TypeReferenceKey(type);
|
|
|
|
|
if (info.types.ContainsKey(key))
|
|
|
|
|
return false;
|
|
|
|
|
|
|
|
|
|
info.types[key] = true;
|
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// May not return all args. The args are returned in reverse order.
|
|
|
|
|
List<Instruction> getPushedArgInstructions(IList<Instruction> instructions, int index) {
|
|
|
|
|
int pushes, pops;
|
|
|
|
|
DotNetUtils.calculateStackUsage(instructions[index], false, out pushes, out pops);
|
|
|
|
|
if (pops == -1)
|
|
|
|
|
return new List<Instruction>();
|
|
|
|
|
return getPushedArgInstructions(instructions, index, pops);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// May not return all args. The args are returned in reverse order.
|
|
|
|
|
List<Instruction> getPushedArgInstructions(IList<Instruction> instructions, int index, int numArgs) {
|
|
|
|
|
List<Instruction> args = new List<Instruction>(numArgs);
|
|
|
|
|
|
|
|
|
|
int skipPushes = 0;
|
|
|
|
|
while (index >= 0 && args.Count < numArgs) {
|
|
|
|
|
var instr = getPreviousInstruction(instructions, ref index);
|
|
|
|
|
if (instr == null)
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
int pushes, pops;
|
|
|
|
|
DotNetUtils.calculateStackUsage(instr, false, out pushes, out pops);
|
|
|
|
|
if (pops == -1)
|
|
|
|
|
break;
|
|
|
|
|
if (pushes > 1)
|
|
|
|
|
break; // dup
|
|
|
|
|
|
|
|
|
|
if (skipPushes > 0) {
|
|
|
|
|
skipPushes -= pushes;
|
|
|
|
|
if (skipPushes < 0)
|
|
|
|
|
break;
|
|
|
|
|
skipPushes += pops;
|
|
|
|
|
}
|
|
|
|
|
else {
|
|
|
|
|
if (pushes == 1)
|
|
|
|
|
args.Add(instr);
|
|
|
|
|
skipPushes += pops;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return args;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
bool deobfuscateFields() {
|
|
|
|
|
if (!updateFields())
|
|
|
|
|
return false;
|
2011-11-01 02:40:57 +08:00
|
|
|
|
|
2011-11-01 09:22:05 +08:00
|
|
|
|
var infos = new List<TypeInfo<FieldDefinition>>(fieldWrites.Values);
|
2011-11-01 02:40:57 +08:00
|
|
|
|
infos.Sort((a, b) => {
|
2011-11-01 09:22:05 +08:00
|
|
|
|
if (a.arg.DeclaringType.MetadataToken.ToInt32() < b.arg.DeclaringType.MetadataToken.ToInt32()) return -1;
|
|
|
|
|
if (a.arg.DeclaringType.MetadataToken.ToInt32() > b.arg.DeclaringType.MetadataToken.ToInt32()) return 1;
|
2011-11-01 02:40:57 +08:00
|
|
|
|
|
2011-11-01 09:22:05 +08:00
|
|
|
|
if (a.arg.MetadataToken.ToInt32() < b.arg.MetadataToken.ToInt32()) return -1;
|
|
|
|
|
if (a.arg.MetadataToken.ToInt32() > b.arg.MetadataToken.ToInt32()) return 1;
|
2011-11-01 02:40:57 +08:00
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
});
|
2011-11-01 06:58:19 +08:00
|
|
|
|
if (infos.Count == 0)
|
|
|
|
|
return false;
|
2011-11-01 02:40:57 +08:00
|
|
|
|
|
|
|
|
|
Log.v("Changing field types from object -> real type");
|
|
|
|
|
Log.indent();
|
2011-11-01 06:58:19 +08:00
|
|
|
|
bool changed = false;
|
2011-11-01 02:40:57 +08:00
|
|
|
|
foreach (var info in infos) {
|
2011-11-01 06:58:19 +08:00
|
|
|
|
if (info.newType == null || MemberReferenceHelper.isSystemObject(info.newType))
|
2011-11-01 02:40:57 +08:00
|
|
|
|
continue;
|
2011-11-01 06:58:19 +08:00
|
|
|
|
|
2011-11-01 09:22:05 +08:00
|
|
|
|
fieldWrites.Remove(new FieldReferenceAndDeclaringTypeKey(info.arg));
|
|
|
|
|
Log.v("{0:X8}: new type: {1} ({2:X8})", info.arg.MetadataToken.ToInt32(), info.newType, info.newType.MetadataToken.ToInt32());
|
|
|
|
|
info.arg.FieldType = info.newType;
|
2011-11-01 06:58:19 +08:00
|
|
|
|
changed = true;
|
2011-11-01 02:40:57 +08:00
|
|
|
|
}
|
|
|
|
|
Log.deIndent();
|
2011-11-01 06:58:19 +08:00
|
|
|
|
return changed;
|
2011-11-01 02:40:57 +08:00
|
|
|
|
}
|
|
|
|
|
|
2011-11-01 06:58:19 +08:00
|
|
|
|
bool updateFields() {
|
2011-11-01 02:40:57 +08:00
|
|
|
|
foreach (var info in fieldWrites.Values)
|
|
|
|
|
info.types.Clear();
|
|
|
|
|
|
|
|
|
|
foreach (var method in allMethods) {
|
|
|
|
|
if (method.Body == null)
|
|
|
|
|
continue;
|
|
|
|
|
var instructions = method.Body.Instructions;
|
|
|
|
|
for (int i = 0; i < instructions.Count; i++) {
|
|
|
|
|
var instr = instructions[i];
|
|
|
|
|
if (instr.OpCode.Code != Code.Stfld && instr.OpCode.Code != Code.Stsfld)
|
|
|
|
|
continue;
|
|
|
|
|
|
|
|
|
|
var field = instr.Operand as FieldReference;
|
2011-11-01 09:22:05 +08:00
|
|
|
|
TypeInfo<FieldDefinition> info;
|
2011-11-01 02:40:57 +08:00
|
|
|
|
if (!fieldWrites.TryGetValue(new FieldReferenceAndDeclaringTypeKey(field), out info))
|
|
|
|
|
continue;
|
|
|
|
|
|
2011-11-01 09:22:05 +08:00
|
|
|
|
var fieldType = getLoadedType(method, instructions, i);
|
|
|
|
|
if (fieldType == null)
|
2011-11-01 02:40:57 +08:00
|
|
|
|
continue;
|
|
|
|
|
|
2011-11-01 09:22:05 +08:00
|
|
|
|
info.types[new TypeReferenceKey(fieldType)] = true;
|
|
|
|
|
}
|
|
|
|
|
}
|
2011-11-01 02:40:57 +08:00
|
|
|
|
|
2011-11-01 09:22:05 +08:00
|
|
|
|
bool changed = false;
|
|
|
|
|
foreach (var info in fieldWrites.Values)
|
|
|
|
|
changed |= info.updateNewType();
|
|
|
|
|
return changed;
|
|
|
|
|
}
|
2011-11-01 02:40:57 +08:00
|
|
|
|
|
2011-11-01 09:22:05 +08:00
|
|
|
|
TypeReference getLoadedType(MethodDefinition method, IList<Instruction> instructions, int instrIndex) {
|
|
|
|
|
var prev = getPreviousInstruction(instructions, ref instrIndex);
|
|
|
|
|
if (prev == null)
|
|
|
|
|
return null;
|
2011-11-01 02:40:57 +08:00
|
|
|
|
|
2011-11-01 09:22:05 +08:00
|
|
|
|
TypeReference fieldType;
|
|
|
|
|
switch (prev.OpCode.Code) {
|
|
|
|
|
case Code.Ldstr:
|
|
|
|
|
fieldType = module.TypeSystem.String;
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case Code.Call:
|
|
|
|
|
case Code.Calli:
|
|
|
|
|
case Code.Callvirt:
|
|
|
|
|
var calledMethod = prev.Operand as MethodReference;
|
|
|
|
|
if (calledMethod == null)
|
|
|
|
|
return null;
|
|
|
|
|
fieldType = calledMethod.MethodReturnType.ReturnType;
|
|
|
|
|
break;
|
2011-11-01 02:40:57 +08:00
|
|
|
|
|
2011-11-01 09:22:05 +08:00
|
|
|
|
case Code.Newarr:
|
|
|
|
|
fieldType = prev.Operand as TypeReference;
|
|
|
|
|
if (fieldType == null)
|
|
|
|
|
return null;
|
|
|
|
|
fieldType = new ArrayType(fieldType);
|
|
|
|
|
break;
|
2011-11-01 02:40:57 +08:00
|
|
|
|
|
2011-11-01 09:22:05 +08:00
|
|
|
|
case Code.Newobj:
|
|
|
|
|
var ctor = prev.Operand as MethodReference;
|
|
|
|
|
if (ctor == null)
|
|
|
|
|
return null;
|
|
|
|
|
fieldType = ctor.DeclaringType;
|
|
|
|
|
break;
|
2011-11-01 02:40:57 +08:00
|
|
|
|
|
2011-11-01 09:22:05 +08:00
|
|
|
|
case Code.Castclass:
|
|
|
|
|
case Code.Isinst:
|
|
|
|
|
fieldType = prev.Operand as TypeReference;
|
|
|
|
|
break;
|
2011-11-01 02:40:57 +08:00
|
|
|
|
|
2011-11-01 09:22:05 +08:00
|
|
|
|
case Code.Ldarg:
|
|
|
|
|
case Code.Ldarg_S:
|
|
|
|
|
case Code.Ldarg_0:
|
|
|
|
|
case Code.Ldarg_1:
|
|
|
|
|
case Code.Ldarg_2:
|
|
|
|
|
case Code.Ldarg_3:
|
|
|
|
|
fieldType = DotNetUtils.getArgType(method, prev);
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case Code.Ldloc:
|
|
|
|
|
case Code.Ldloc_S:
|
|
|
|
|
case Code.Ldloc_0:
|
|
|
|
|
case Code.Ldloc_1:
|
|
|
|
|
case Code.Ldloc_2:
|
|
|
|
|
case Code.Ldloc_3:
|
|
|
|
|
var local = DotNetUtils.getLocalVar(method.Body.Variables, prev);
|
|
|
|
|
if (local == null)
|
|
|
|
|
return null;
|
|
|
|
|
fieldType = local.VariableType;
|
|
|
|
|
break;
|
2011-11-01 02:40:57 +08:00
|
|
|
|
|
2011-11-01 09:22:05 +08:00
|
|
|
|
case Code.Ldfld:
|
|
|
|
|
case Code.Ldsfld:
|
|
|
|
|
var field2 = prev.Operand as FieldReference;
|
|
|
|
|
if (field2 == null)
|
|
|
|
|
return null;
|
|
|
|
|
fieldType = field2.FieldType;
|
|
|
|
|
break;
|
2011-11-01 02:40:57 +08:00
|
|
|
|
|
2011-11-01 09:22:05 +08:00
|
|
|
|
default:
|
|
|
|
|
return null;
|
2011-11-01 02:40:57 +08:00
|
|
|
|
}
|
|
|
|
|
|
2011-11-01 09:22:05 +08:00
|
|
|
|
if (!isValidType(fieldType))
|
|
|
|
|
return null;
|
2011-11-01 02:40:57 +08:00
|
|
|
|
|
2011-11-01 09:22:05 +08:00
|
|
|
|
return fieldType;
|
|
|
|
|
}
|
2011-11-01 02:40:57 +08:00
|
|
|
|
|
2011-11-01 09:22:05 +08:00
|
|
|
|
static bool isValidType(TypeReference type) {
|
|
|
|
|
if (type == null)
|
|
|
|
|
return false;
|
|
|
|
|
if (type.IsValueType)
|
|
|
|
|
return false;
|
|
|
|
|
if (MemberReferenceHelper.isSystemObject(type))
|
|
|
|
|
return false;
|
|
|
|
|
if (MemberReferenceHelper.verifyType(type, "mscorlib", "System.Void"))
|
|
|
|
|
return false;
|
|
|
|
|
if (type is GenericParameter)
|
|
|
|
|
return false;
|
|
|
|
|
return true;
|
2011-11-01 02:40:57 +08:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static TypeReference getCommonBaseClass(TypeReference a, TypeReference b) {
|
|
|
|
|
return null; //TODO:
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static Instruction getPreviousInstruction(IList<Instruction> instructions, ref int instrIndex) {
|
|
|
|
|
while (true) {
|
|
|
|
|
instrIndex--;
|
|
|
|
|
if (instrIndex < 0)
|
|
|
|
|
return null;
|
|
|
|
|
var instr = instructions[instrIndex];
|
|
|
|
|
if (instr.OpCode.Code == Code.Nop)
|
|
|
|
|
continue;
|
2011-11-01 06:58:19 +08:00
|
|
|
|
if (instr.OpCode.OpCodeType == OpCodeType.Prefix)
|
|
|
|
|
continue;
|
2011-11-01 02:40:57 +08:00
|
|
|
|
switch (instr.OpCode.FlowControl) {
|
|
|
|
|
case FlowControl.Next:
|
|
|
|
|
case FlowControl.Call:
|
|
|
|
|
return instr;
|
|
|
|
|
default:
|
|
|
|
|
return null;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|