/*
Copyright (C) 2011-2012 de4dot@gmail.com
This file is part of de4dot.
de4dot is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
de4dot is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with de4dot. If not, see .
*/
using System;
using System.Collections.Generic;
using Mono.Cecil;
using Mono.Cecil.Cil;
using Mono.Cecil.Metadata;
namespace de4dot.blocks {
public enum FrameworkType {
Unknown,
Desktop,
Silverlight, // and WindowsPhone, XNA Xbox360
CompactFramework,
XNA,
Zune,
}
class TypeCache {
ModuleDefinition module;
TypeDefinitionDict typeRefToDef = new TypeDefinitionDict();
public TypeCache(ModuleDefinition module) {
this.module = module;
init();
}
void init() {
foreach (var type in module.GetTypes())
typeRefToDef.add(type, type);
}
public TypeDefinition lookup(TypeReference typeReference) {
return typeRefToDef.find(typeReference);
}
}
public class TypeCaches {
Dictionary typeCaches = new Dictionary();
// Should be called when the whole module is reloaded or when a lot of types have been
// modified (eg. renamed)
public void invalidate(ModuleDefinition module) {
if (module == null)
return;
typeCaches.Remove(module);
}
// Call this to invalidate all modules
public List invalidateAll() {
var list = new List(typeCaches.Keys);
typeCaches.Clear();
return list;
}
public TypeDefinition lookup(ModuleDefinition module, TypeReference typeReference) {
TypeCache typeCache;
if (!typeCaches.TryGetValue(module, out typeCache))
typeCaches[module] = typeCache = new TypeCache(module);
return typeCache.lookup(typeReference);
}
}
public class CallCounter {
Dictionary calls = new Dictionary();
public void add(MethodReference calledMethod) {
int count;
var key = new MethodReferenceAndDeclaringTypeKey(calledMethod);
calls.TryGetValue(key, out count);
calls[key] = count + 1;
}
public MethodReference most() {
int numCalls;
return most(out numCalls);
}
public MethodReference most(out int numCalls) {
MethodReference method = null;
int callCount = 0;
foreach (var key in calls.Keys) {
if (calls[key] > callCount) {
callCount = calls[key];
method = key.MethodReference;
}
}
numCalls = callCount;
return method;
}
}
public class MethodCalls {
Dictionary methodCalls = new Dictionary(StringComparer.Ordinal);
public void addMethodCalls(MethodDefinition method) {
if (!method.HasBody)
return;
foreach (var instr in method.Body.Instructions) {
var calledMethod = instr.Operand as MethodReference;
if (calledMethod != null)
add(calledMethod);
}
}
public void add(MethodReference method) {
string key = method.FullName;
if (!methodCalls.ContainsKey(key))
methodCalls[key] = 0;
methodCalls[key]++;
}
public int count(string methodFullName) {
int count;
methodCalls.TryGetValue(methodFullName, out count);
return count;
}
public bool called(string methodFullName) {
return count(methodFullName) != 0;
}
}
public static class DotNetUtils {
public static readonly TypeCaches typeCaches = new TypeCaches();
public static bool isLeave(Instruction instr) {
return instr.OpCode == OpCodes.Leave || instr.OpCode == OpCodes.Leave_S;
}
public static bool isBr(Instruction instr) {
return instr.OpCode == OpCodes.Br || instr.OpCode == OpCodes.Br_S;
}
public static bool isBrfalse(Instruction instr) {
return instr.OpCode == OpCodes.Brfalse || instr.OpCode == OpCodes.Brfalse_S;
}
public static bool isBrtrue(Instruction instr) {
return instr.OpCode == OpCodes.Brtrue || instr.OpCode == OpCodes.Brtrue_S;
}
public static bool isLdcI4(Instruction instruction) {
return isLdcI4(instruction.OpCode.Code);
}
public static bool isLdcI4(Code code) {
switch (code) {
case Code.Ldc_I4_M1:
case Code.Ldc_I4_0:
case Code.Ldc_I4_1:
case Code.Ldc_I4_2:
case Code.Ldc_I4_3:
case Code.Ldc_I4_4:
case Code.Ldc_I4_5:
case Code.Ldc_I4_6:
case Code.Ldc_I4_7:
case Code.Ldc_I4_8:
case Code.Ldc_I4_S:
case Code.Ldc_I4:
return true;
default:
return false;
}
}
public static int getLdcI4Value(Instruction instruction) {
switch (instruction.OpCode.Code) {
case Code.Ldc_I4_M1:return -1;
case Code.Ldc_I4_0: return 0;
case Code.Ldc_I4_1: return 1;
case Code.Ldc_I4_2: return 2;
case Code.Ldc_I4_3: return 3;
case Code.Ldc_I4_4: return 4;
case Code.Ldc_I4_5: return 5;
case Code.Ldc_I4_6: return 6;
case Code.Ldc_I4_7: return 7;
case Code.Ldc_I4_8: return 8;
case Code.Ldc_I4_S: return (sbyte)instruction.Operand;
case Code.Ldc_I4: return (int)instruction.Operand;
default:
throw new ApplicationException(string.Format("Not an ldc.i4 instruction: {0}", instruction));
}
}
// Return true if it's one of the stloc instructions
public static bool isStloc(Instruction instr) {
switch (instr.OpCode.Code) {
case Code.Stloc:
case Code.Stloc_0:
case Code.Stloc_1:
case Code.Stloc_2:
case Code.Stloc_3:
case Code.Stloc_S:
return true;
default:
return false;
}
}
// Returns true if it's one of the ldloc instructions
public static bool isLdloc(Instruction instr) {
switch (instr.OpCode.Code) {
case Code.Ldloc:
case Code.Ldloc_0:
case Code.Ldloc_1:
case Code.Ldloc_2:
case Code.Ldloc_3:
case Code.Ldloc_S:
return true;
default:
return false;
}
}
// Returns the variable or null if it's not a ldloc/stloc instruction. It does not return
// a local variable if it's a ldloca/ldloca.s instruction.
public static VariableDefinition getLocalVar(IList locals, Instruction instr) {
int index;
switch (instr.OpCode.Code) {
case Code.Ldloc:
case Code.Ldloc_S:
case Code.Stloc:
case Code.Stloc_S:
return (VariableDefinition)instr.Operand;
case Code.Ldloc_0:
case Code.Ldloc_1:
case Code.Ldloc_2:
case Code.Ldloc_3:
index = instr.OpCode.Code - Code.Ldloc_0;
break;
case Code.Stloc_0:
case Code.Stloc_1:
case Code.Stloc_2:
case Code.Stloc_3:
index = instr.OpCode.Code - Code.Stloc_0;
break;
default:
return null;
}
if (index < locals.Count)
return locals[index];
return null;
}
public static bool isConditionalBranch(Code code) {
switch (code) {
case Code.Bge:
case Code.Bge_S:
case Code.Bge_Un:
case Code.Bge_Un_S:
case Code.Blt:
case Code.Blt_S:
case Code.Blt_Un:
case Code.Blt_Un_S:
case Code.Bgt:
case Code.Bgt_S:
case Code.Bgt_Un:
case Code.Bgt_Un_S:
case Code.Ble:
case Code.Ble_S:
case Code.Ble_Un:
case Code.Ble_Un_S:
case Code.Brfalse:
case Code.Brfalse_S:
case Code.Brtrue:
case Code.Brtrue_S:
case Code.Beq:
case Code.Beq_S:
case Code.Bne_Un:
case Code.Bne_Un_S:
return true;
default:
return false;
}
}
public static TypeDefinition getModuleType(ModuleDefinition module) {
if (module.Types.Count == 0)
return null;
if (module.Runtime == TargetRuntime.Net_1_0 || module.Runtime == TargetRuntime.Net_1_1) {
if (module.Types[0].FullName == "")
return module.Types[0];
return null;
}
// It's always the first one, no matter what it is named.
return module.Types[0];
}
public static MethodDefinition getModuleTypeCctor(ModuleDefinition module) {
return getMethod(getModuleType(module), ".cctor");
}
public static bool isEmpty(MethodDefinition method) {
if (method.Body == null)
return false;
foreach (var instr in method.Body.Instructions) {
var code = instr.OpCode.Code;
if (code != Code.Nop && code != Code.Ret)
return false;
}
return true;
}
public static bool isEmptyObfuscated(MethodDefinition method) {
if (method.Body == null)
return false;
int index = 0;
var instr = getInstruction(method.Body.Instructions, ref index);
if (instr == null || instr.OpCode.Code != Code.Ret)
return false;
return true;
}
public static FieldDefinition findFieldType(TypeDefinition typeDefinition, string typeName, bool isStatic) {
if (typeDefinition == null)
return null;
foreach (var field in typeDefinition.Fields) {
if (field.FieldType.FullName == typeName && field.IsStatic == isStatic)
return field;
}
return null;
}
public static IEnumerable findMethods(IEnumerable methods, string returnType, string[] argsTypes, bool isStatic = true) {
foreach (var method in methods) {
if (!method.HasBody || method.CallingConvention != MethodCallingConvention.Default)
continue;
if (method.IsStatic != isStatic || method.Parameters.Count != argsTypes.Length)
continue;
if (method.GenericParameters.Count > 0)
continue;
if (method.MethodReturnType.ReturnType.FullName != returnType)
continue;
for (int i = 0; i < argsTypes.Length; i++) {
if (method.Parameters[i].ParameterType.FullName != argsTypes[i])
goto next;
}
yield return method;
next: ;
}
}
public static bool isDelegate(TypeReference type) {
return type != null && (type.FullName == "System.Delegate" || type.FullName == "System.MulticastDelegate");
}
public static bool derivesFromDelegate(TypeDefinition type) {
return type != null && isDelegate(type.BaseType);
}
public static bool isSameAssembly(TypeReference type, string assembly) {
return MemberReferenceHelper.getCanonicalizedScopeName(type.Scope) == assembly.ToLowerInvariant();
}
public static bool isMethod(MethodReference method, string returnType, string parameters) {
return method != null && method.FullName == returnType + " " + method.DeclaringType.FullName + "::" + method.Name + parameters;
}
public static MethodDefinition getPInvokeMethod(TypeDefinition type, string dll, string funcName) {
foreach (var method in type.Methods) {
if (isPinvokeMethod(method, dll, funcName))
return method;
}
return null;
}
public static bool isPinvokeMethod(MethodDefinition method, string dll, string funcName) {
if (method == null)
return false;
if (method.PInvokeInfo == null || method.PInvokeInfo.EntryPoint != funcName)
return false;
return getDllName(dll).Equals(getDllName(method.PInvokeInfo.Module.Name), StringComparison.OrdinalIgnoreCase);
}
public static string getDllName(string dll) {
if (dll.EndsWith(".dll", StringComparison.OrdinalIgnoreCase))
return dll.Substring(0, dll.Length - 4);
return dll;
}
public static MethodDefinition getMethod(TypeDefinition type, string name) {
if (type == null)
return null;
foreach (var method in type.Methods) {
if (method.Name == name)
return method;
}
return null;
}
public static MethodDefinition getMethod(TypeDefinition type, MethodReference methodReference) {
if (type == null || methodReference == null)
return null;
if (methodReference is MethodDefinition)
return (MethodDefinition)methodReference;
foreach (var method in type.Methods) {
if (MemberReferenceHelper.compareMethodReference(method, methodReference))
return method;
}
return null;
}
public static MethodDefinition getMethod(ModuleDefinition module, MethodReference method) {
if (method == null)
return null;
if (method is MethodDefinition)
return (MethodDefinition)method;
return getMethod(getType(module, method.DeclaringType), method);
}
public static MethodDefinition getMethod(TypeDefinition type, string returnType, string parameters) {
foreach (var method in type.Methods) {
if (isMethod(method, returnType, parameters))
return method;
}
return null;
}
public static IEnumerable getNormalMethods(TypeDefinition type) {
foreach (var method in type.Methods) {
if (method.HasPInvokeInfo)
continue;
if (method.Name == ".ctor" || method.Name == ".cctor")
continue;
yield return method;
}
}
public static TypeDefinition getType(ModuleDefinition module, TypeReference typeReference) {
if (typeReference == null)
return null;
if (typeReference is TypeDefinition)
return (TypeDefinition)typeReference;
return typeCaches.lookup(module, typeReference);
}
public static FieldDefinition getField(ModuleDefinition module, FieldReference field) {
if (field == null)
return null;
if (field is FieldDefinition)
return (FieldDefinition)field;
return getField(getType(module, field.DeclaringType), field);
}
public static FieldDefinition getField(TypeDefinition type, FieldReference fieldReference) {
if (type == null || fieldReference == null)
return null;
if (fieldReference is FieldDefinition)
return (FieldDefinition)fieldReference;
foreach (var field in type.Fields) {
if (MemberReferenceHelper.compareFieldReference(field, fieldReference))
return field;
}
return null;
}
public static FieldDefinition getField(TypeDefinition type, string typeFullName) {
if (type == null)
return null;
foreach (var field in type.Fields) {
if (field.FieldType.FullName == typeFullName)
return field;
}
return null;
}
public static FieldDefinition getFieldByName(TypeDefinition type, string name) {
if (type == null)
return null;
foreach (var field in type.Fields) {
if (field.Name == name)
return field;
}
return null;
}
public static IEnumerable getMethodCalls(MethodDefinition method) {
var list = new List();
if (method.HasBody) {
foreach (var instr in method.Body.Instructions) {
var calledMethod = instr.Operand as MethodReference;
if (calledMethod != null)
list.Add(calledMethod);
}
}
return list;
}
public static MethodCalls getMethodCallCounts(MethodDefinition method) {
var methodCalls = new MethodCalls();
methodCalls.addMethodCalls(method);
return methodCalls;
}
public static IList getCodeStrings(MethodDefinition method) {
var strings = new List();
if (method != null && method.Body != null) {
foreach (var instr in method.Body.Instructions) {
if (instr.OpCode.Code == Code.Ldstr)
strings.Add((string)instr.Operand);
}
}
return strings;
}
public static Resource getResource(ModuleDefinition module, string name) {
return getResource(module, new List { name });
}
public static Resource getResource(ModuleDefinition module, IEnumerable strings) {
if (!module.HasResources)
return null;
var resources = module.Resources;
foreach (var resourceName in strings) {
if (resourceName == null)
continue;
foreach (var resource in resources) {
if (resource.Name == resourceName)
return resource;
}
}
return null;
}
public static Instruction clone(Instruction instr) {
return new Instruction {
Offset = instr.Offset,
OpCode = instr.OpCode,
Operand = instr.Operand,
SequencePoint = instr.SequencePoint,
};
}
public static void copyBody(MethodDefinition method, out IList instructions, out IList exceptionHandlers) {
if (method == null || !method.HasBody) {
instructions = new List();
exceptionHandlers = new List();
return;
}
var oldInstrs = method.Body.Instructions;
var oldExHandlers = method.Body.ExceptionHandlers;
instructions = new List(oldInstrs.Count);
exceptionHandlers = new List(oldExHandlers.Count);
var oldToIndex = Utils.createObjectToIndexDictionary(oldInstrs);
foreach (var oldInstr in oldInstrs)
instructions.Add(clone(oldInstr));
foreach (var newInstr in instructions) {
var operand = newInstr.Operand;
if (operand is Instruction)
newInstr.Operand = instructions[oldToIndex[(Instruction)operand]];
else if (operand is Instruction[]) {
var oldArray = (Instruction[])operand;
var newArray = new Instruction[oldArray.Length];
for (int i = 0; i < oldArray.Length; i++)
newArray[i] = instructions[oldToIndex[oldArray[i]]];
newInstr.Operand = newArray;
}
}
foreach (var oldEx in oldExHandlers) {
var newEx = new ExceptionHandler(oldEx.HandlerType) {
TryStart = getInstruction(instructions, oldToIndex, oldEx.TryStart),
TryEnd = getInstruction(instructions, oldToIndex, oldEx.TryEnd),
FilterStart = getInstruction(instructions, oldToIndex, oldEx.FilterStart),
HandlerStart= getInstruction(instructions, oldToIndex, oldEx.HandlerStart),
HandlerEnd = getInstruction(instructions, oldToIndex, oldEx.HandlerEnd),
CatchType = oldEx.CatchType,
};
exceptionHandlers.Add(newEx);
}
}
static Instruction getInstruction(IList instructions, IDictionary instructionToIndex, Instruction instruction) {
if (instruction == null)
return null;
return instructions[instructionToIndex[instruction]];
}
public static void restoreBody(MethodDefinition method, IEnumerable instructions, IEnumerable exceptionHandlers) {
if (method == null || !method.HasBody)
return;
var bodyInstrs = method.Body.Instructions;
bodyInstrs.Clear();
foreach (var instr in instructions)
bodyInstrs.Add(instr);
var bodyExceptionHandlers = method.Body.ExceptionHandlers;
bodyExceptionHandlers.Clear();
foreach (var eh in exceptionHandlers)
bodyExceptionHandlers.Add(eh);
}
public static void copyBodyFromTo(MethodDefinition fromMethod, MethodDefinition toMethod) {
if (fromMethod == toMethod)
return;
IList instructions;
IList exceptionHandlers;
copyBody(fromMethod, out instructions, out exceptionHandlers);
restoreBody(toMethod, instructions, exceptionHandlers);
copyLocalsFromTo(fromMethod, toMethod);
updateInstructionOperands(fromMethod, toMethod);
}
static void copyLocalsFromTo(MethodDefinition fromMethod, MethodDefinition toMethod) {
var fromBody = fromMethod.Body;
var toBody = toMethod.Body;
toBody.Variables.Clear();
foreach (var local in fromBody.Variables)
toBody.Variables.Add(new VariableDefinition(local.Name, local.VariableType));
}
static void updateInstructionOperands(MethodDefinition fromMethod, MethodDefinition toMethod) {
var fromBody = fromMethod.Body;
var toBody = toMethod.Body;
toBody.InitLocals = fromBody.InitLocals;
toBody.MaxStackSize = fromBody.MaxStackSize;
var newOperands = new Dictionary