2011-09-22 10:55:30 +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;
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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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namespace de4dot.blocks {
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2011-09-24 16:26:29 +08:00
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public class Blocks {
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2011-09-22 10:55:30 +08:00
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MethodDefinition method;
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IList<VariableDefinition> locals;
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MethodBlocks methodBlocks;
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public MethodBlocks MethodBlocks {
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get { return methodBlocks; }
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}
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public IList<VariableDefinition> Locals {
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get { return locals; }
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}
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public MethodDefinition Method {
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get { return method; }
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}
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public Blocks(MethodDefinition method) {
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var body = method.Body;
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this.method = method;
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this.locals = body.Variables;
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methodBlocks = new InstructionListParser(body.Instructions, body.ExceptionHandlers).parse();
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}
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IEnumerable<ScopeBlock> getAllScopeBlocks(ScopeBlock scopeBlock) {
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var list = new List<ScopeBlock>();
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list.Add(scopeBlock);
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list.AddRange(scopeBlock.getAllScopeBlocks());
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return list;
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}
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2011-10-17 06:22:22 +08:00
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public int removeDeadBlocks() {
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2011-09-24 16:26:29 +08:00
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return new DeadBlocksRemover(methodBlocks).remove();
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2011-09-22 10:55:30 +08:00
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}
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public void getCode(out IList<Instruction> allInstructions, out IList<ExceptionHandler> allExceptionHandlers) {
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new CodeGenerator(methodBlocks).getCode(out allInstructions, out allExceptionHandlers);
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}
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2011-10-20 08:38:44 +08:00
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struct LocalVariableInfo {
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public Block block;
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public int index;
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public LocalVariableInfo(Block block, int index) {
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this.block = block;
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this.index = index;
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}
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}
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public int optimizeLocals() {
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if (locals.Count == 0)
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return 0;
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var usedLocals = new Dictionary<VariableDefinition, List<LocalVariableInfo>>();
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2011-10-20 08:45:55 +08:00
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foreach (var block in methodBlocks.getAllBlocks()) {
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2011-10-20 08:38:44 +08:00
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for (int i = 0; i < block.Instructions.Count; i++) {
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var instr = block.Instructions[i];
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VariableDefinition local;
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switch (instr.OpCode.Code) {
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case Code.Ldloc:
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case Code.Ldloc_S:
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case Code.Ldloc_0:
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case Code.Ldloc_1:
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case Code.Ldloc_2:
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case Code.Ldloc_3:
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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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local = Instr.getLocalVar(locals, instr);
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break;
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case Code.Ldloca_S:
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case Code.Ldloca:
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local = (VariableDefinition)instr.Operand;
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break;
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default:
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local = null;
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break;
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}
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if (local == null)
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continue;
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List<LocalVariableInfo> list;
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if (!usedLocals.TryGetValue(local, out list))
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usedLocals[local] = list = new List<LocalVariableInfo>();
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list.Add(new LocalVariableInfo(block, i));
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if (usedLocals.Count == locals.Count)
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return 0;
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}
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}
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int newIndex = -1;
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var newLocals = new List<VariableDefinition>(usedLocals.Count);
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foreach (var local in usedLocals.Keys) {
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newIndex++;
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newLocals.Add(local);
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foreach (var info in usedLocals[local])
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info.block.Instructions[info.index] = new Instr(optimizeLocalInstr(info.block.Instructions[info.index], local, (uint)newIndex));
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}
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int numRemoved = locals.Count - newLocals.Count;
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locals.Clear();
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foreach (var local in newLocals)
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locals.Add(local);
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return numRemoved;
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}
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static Instruction optimizeLocalInstr(Instr instr, VariableDefinition local, uint newIndex) {
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switch (instr.OpCode.Code) {
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case Code.Ldloc:
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case Code.Ldloc_S:
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case Code.Ldloc_0:
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case Code.Ldloc_1:
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case Code.Ldloc_2:
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case Code.Ldloc_3:
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if (newIndex == 0)
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return Instruction.Create(OpCodes.Ldloc_0);
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if (newIndex == 1)
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return Instruction.Create(OpCodes.Ldloc_1);
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if (newIndex == 2)
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return Instruction.Create(OpCodes.Ldloc_2);
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if (newIndex == 3)
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return Instruction.Create(OpCodes.Ldloc_3);
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if (newIndex <= 0xFF)
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return Instruction.Create(OpCodes.Ldloc_S, local);
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return Instruction.Create(OpCodes.Ldloc, local);
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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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if (newIndex == 0)
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return Instruction.Create(OpCodes.Stloc_0);
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if (newIndex == 1)
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return Instruction.Create(OpCodes.Stloc_1);
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if (newIndex == 2)
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return Instruction.Create(OpCodes.Stloc_2);
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if (newIndex == 3)
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return Instruction.Create(OpCodes.Stloc_3);
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if (newIndex <= 0xFF)
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return Instruction.Create(OpCodes.Stloc_S, local);
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return Instruction.Create(OpCodes.Stloc, local);
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case Code.Ldloca_S:
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case Code.Ldloca:
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if (newIndex <= 0xFF)
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return Instruction.Create(OpCodes.Ldloca_S, local);
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return Instruction.Create(OpCodes.Ldloca, local);
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default:
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throw new ApplicationException("Invalid ld/st local instruction");
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}
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}
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2011-10-20 08:58:30 +08:00
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public void repartitionBlocks() {
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2011-12-15 17:04:04 +08:00
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mergeNopBlocks();
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2011-10-27 21:57:33 +08:00
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foreach (var scopeBlock in getAllScopeBlocks(methodBlocks)) {
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try {
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scopeBlock.repartitionBlocks();
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}
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catch (NullReferenceException) {
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//TODO: Send this message to the log
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Console.WriteLine("Null ref exception! Invalid metadata token in code? Method: {0:X8}: {1}", method.MetadataToken.ToUInt32(), method.FullName);
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return;
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}
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}
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2011-10-20 08:58:30 +08:00
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}
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2011-12-15 17:04:04 +08:00
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void mergeNopBlocks() {
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var allBlocks = methodBlocks.getAllBlocks();
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var nopBlocks = new Dictionary<Block, bool>();
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foreach (var nopBlock in allBlocks) {
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if (nopBlock.isNopBlock())
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nopBlocks[nopBlock] = true;
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}
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if (nopBlocks.Count == 0)
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return;
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for (int i = 0; i < 10; i++) {
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bool changed = false;
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foreach (var block in allBlocks) {
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Block nopBlockTarget;
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nopBlockTarget = getNopBlockTarget(nopBlocks, block, block.FallThrough);
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if (nopBlockTarget != null) {
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block.setNewFallThrough(nopBlockTarget);
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changed = true;
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}
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if (block.Targets != null) {
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for (int targetIndex = 0; targetIndex < block.Targets.Count; targetIndex++) {
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nopBlockTarget = getNopBlockTarget(nopBlocks, block, block.Targets[targetIndex]);
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if (nopBlockTarget == null)
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continue;
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block.setNewTarget(targetIndex, nopBlockTarget);
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changed = true;
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}
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}
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}
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if (!changed)
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break;
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}
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2011-12-15 23:17:04 +08:00
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foreach (var nopBlock in nopBlocks.Keys)
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nopBlock.Parent.removeDeadBlock(nopBlock);
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2011-12-15 17:04:04 +08:00
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}
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static Block getNopBlockTarget(Dictionary<Block, bool> nopBlocks, Block source, Block nopBlock) {
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if (nopBlock == null || !nopBlocks.ContainsKey(nopBlock) || source == nopBlock.FallThrough)
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return null;
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2011-12-15 23:17:04 +08:00
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if (nopBlock.Parent.BaseBlocks[0] == nopBlock)
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2011-12-15 17:04:04 +08:00
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return null;
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var target = nopBlock.FallThrough;
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if (nopBlock.Parent != target.Parent)
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return null;
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return target;
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}
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2011-09-22 10:55:30 +08:00
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}
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}
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