138 lines
3.8 KiB
C#
138 lines
3.8 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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namespace de4dot.blocks.cflow {
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public class MethodCallInliner : MethodCallInlinerBase {
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protected readonly bool inlineInstanceMethods;
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public MethodCallInliner(bool inlineInstanceMethods) {
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this.inlineInstanceMethods = inlineInstanceMethods;
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}
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protected override bool DeobfuscateInternal() {
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bool modified = false;
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var instructions = block.Instructions;
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for (int i = 0; i < instructions.Count; i++) {
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var instr = instructions[i].Instruction;
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if (instr.OpCode.Code == Code.Call)
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modified |= InlineMethod(instr, i);
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}
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return modified;
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}
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protected virtual bool CanInline(MethodDef method) {
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if (method.GenericParameters.Count > 0)
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return false;
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if (method == blocks.Method)
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return false;
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if (!new SigComparer().Equals(method.DeclaringType, blocks.Method.DeclaringType))
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return false;
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if (method.IsStatic)
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return true;
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if (method.IsVirtual)
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return false;
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return inlineInstanceMethods;
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}
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protected virtual Instruction GetFirstInstruction(IList<Instruction> instrs, ref int index) {
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return DotNetUtils.GetInstruction(instrs, ref index);
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}
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bool InlineMethod(Instruction callInstr, int instrIndex) {
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var methodToInline = callInstr.Operand as MethodDef;
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if (methodToInline == null)
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return false;
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if (!CanInline(methodToInline))
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return false;
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var body = methodToInline.Body;
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if (body == null)
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return false;
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int index = 0;
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var instr = GetFirstInstruction(body.Instructions, ref index);
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if (instr == null)
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return false;
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bool inlinedMethod;
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switch (instr.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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case Code.Ldarga:
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case Code.Ldarga_S:
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case Code.Call:
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case Code.Callvirt:
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case Code.Newobj:
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inlinedMethod = InlineOtherMethod(instrIndex, methodToInline, instr, index);
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break;
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case Code.Ldc_I4:
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case Code.Ldc_I4_0:
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case Code.Ldc_I4_1:
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case Code.Ldc_I4_2:
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case Code.Ldc_I4_3:
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case Code.Ldc_I4_4:
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case Code.Ldc_I4_5:
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case Code.Ldc_I4_6:
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case Code.Ldc_I4_7:
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case Code.Ldc_I4_8:
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case Code.Ldc_I4_M1:
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case Code.Ldc_I4_S:
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case Code.Ldc_I8:
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case Code.Ldc_R4:
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case Code.Ldc_R8:
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case Code.Ldftn:
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case Code.Ldnull:
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case Code.Ldstr:
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case Code.Ldtoken:
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case Code.Ldsfld:
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case Code.Ldsflda:
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inlinedMethod = InlineLoadMethod(instrIndex, methodToInline, instr, index);
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break;
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default:
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inlinedMethod = false;
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break;
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}
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OnInlinedMethod(methodToInline, inlinedMethod);
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return inlinedMethod;
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}
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protected virtual void OnInlinedMethod(MethodDef methodToInline, bool inlinedMethod) {
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}
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protected override bool IsCompatibleType(int paramIndex, IType origType, IType newType) {
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if (new SigComparer(SigComparerOptions.IgnoreModifiers).Equals(origType, newType))
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return true;
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if (IsValueType(newType) || IsValueType(origType))
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return false;
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return newType.FullName == "System.Object";
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}
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}
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}
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