| public GetILProcessor ( ) : Mono.Cecil.Cil.ILProcessor | ||
| Результат | Mono.Cecil.Cil.ILProcessor | |
private static void InsertInvalidIl(MethodBody methodBody)
{
//Get the instructions and cil worker
var instructions = methodBody.Instructions;
if (instructions.Count <= 0)
{
return; //We can only do this if we have instructions to work with
}
ILProcessor il = methodBody.GetILProcessor();
//First create an invalid il instruction
OpCode fakeOpCode = CreateInvalidOpCode();
Instruction invalidIlInstr1 = il.Create(fakeOpCode);
Instruction invalidIlInstr2 = il.Create(fakeOpCode);
Instruction originalFirst = instructions[0];
//Insert invalid il at the start
il.InsertBefore(originalFirst, invalidIlInstr1);
il.InsertBefore(invalidIlInstr1, invalidIlInstr2);
//Create the branch statement
Instruction branchStatement = il.Create(OpCodes.Br_S, originalFirst);
//Add the branch to the start
il.InsertBefore(invalidIlInstr2, branchStatement);
//Readjust the offsets
il.AdjustOffsets(methodBody, 4);
}
/// <summary>
/// Create a new method in the declaring type of the given implicit implementation with the given name.
/// This method will call the implicit implementation.
/// </summary>
internal static MethodDefinition CreateExplicitStub(MethodDefinition implicitImpl, string name, MethodDefinition iMethod, bool avoidGenericParam)
{
// Create method
var newMethod = new MethodDefinition(name, implicitImpl.Attributes, implicitImpl.ReturnType);
newMethod.IsVirtual = false;
newMethod.IsAbstract = false;
newMethod.IsFinal = true;
// Clone generic parameters
foreach (var gp in implicitImpl.GenericParameters)
{
newMethod.GenericParameters.Add(new GenericParameter(gp.Name, newMethod));
}
// Update according to new context
var cloner = new TypeCloner(avoidGenericParam, implicitImpl.Module.TypeSystem);
newMethod.ReturnType = cloner.Get(implicitImpl.ReturnType, newMethod);
// Clone parameters
foreach (var p in iMethod.Parameters)
{
newMethod.Parameters.Add(new ParameterDefinition(p.Name, p.Attributes, cloner.Get(p.ParameterType, newMethod)));
}
// Add the method
var targetType = implicitImpl.DeclaringType;
targetType.Methods.Add(newMethod);
// Add override
newMethod.Overrides.Add(iMethod);
// Create method body
var body = new MethodBody(newMethod);
newMethod.Body = body;
var worker = body.GetILProcessor();
// Push this
worker.Emit(OpCodes.Ldarg, body.ThisParameter);
for (var i = 0; i < implicitImpl.Parameters.Count; i++)
{
var p = iMethod.Parameters[i];
var newMethodParam = newMethod.Parameters[i];
worker.Emit(OpCodes.Ldarg, newMethodParam);
if (/*avoidGenericParam &&*/ p.ParameterType.ContainsGenericParameter)
{
worker.Emit(OpCodes.Box, implicitImpl.Parameters[i].ParameterType);
}
}
worker.Emit(implicitImpl.IsVirtual ? OpCodes.Callvirt : OpCodes.Call, implicitImpl);
worker.Emit(OpCodes.Ret);
// Mark method reachable
if (implicitImpl.IsReachable)
{
newMethod.SetReachable(null);
}
return newMethod;
}
private void WeaveDependencyProperty(MethodBody staticCtorBody, FieldReference field, PropertyDefinition property)
{
var assembly = property.DeclaringType.Module.Assembly;
var propertyType = assembly.ImportType(Type.GetType(property.PropertyType.FullName));
var getTypeFromHandle = assembly.ImportMethod(typeof(Type).GetMethod("GetTypeFromHandle"));
var register = assembly.ImportMethod(typeof(DependencyProperty).GetMethod("Register", new[] { typeof(string), typeof(Type), typeof(Type) }));
// ignore previously weaved DPs
if (staticCtorBody.Instructions.Any(i => i.Operand != null && i.Operand.ToString() == field.ToString()))
{
return;
}
var ret = staticCtorBody.Instructions.Last();
if (ret.OpCode != OpCodes.Ret)
{
throw new InvalidOperationException("The last instruction should be OpCode.Ret");
}
HasChanges = true;
var proc = staticCtorBody.GetILProcessor();
proc.InsertBefore(ret, proc.Create(OpCodes.Ldstr, property.Name));
proc.InsertBefore(ret, proc.Create(OpCodes.Ldtoken, propertyType));
proc.InsertBefore(ret, proc.Create(OpCodes.Call, getTypeFromHandle));
proc.InsertBefore(ret, proc.Create(OpCodes.Ldtoken, property.DeclaringType));
proc.InsertBefore(ret, proc.Create(OpCodes.Call, getTypeFromHandle));
proc.InsertBefore(ret, proc.Create(OpCodes.Call, register));
proc.InsertBefore(ret, proc.Create(OpCodes.Stsfld, field));
}
public static void RewriteCilCodeBlock(Mono.Cecil.Cil.MethodBody body)
{
List <Instruction> result = new List <Instruction>();
for (int j = 0; j < body.Instructions.Count; ++j)
{
Instruction i = body.Instructions[j];
var inst_to_insert = i;
if (i.OpCode.FlowControl == FlowControl.Call)
{
object method = i.Operand;
if (method as Mono.Cecil.MethodReference == null)
{
throw new Exception();
}
var method_reference = method as Mono.Cecil.MethodReference;
TypeReference mr_dt = method_reference.DeclaringType;
var bcl_substitute = SubstituteMethod(method_reference);
if (bcl_substitute != null)
{
CallSite cs = new CallSite(typeof(void).ToMonoTypeReference());
body.Instructions.RemoveAt(j);
var worker = body.GetILProcessor();
Instruction new_inst = worker.Create(i.OpCode, bcl_substitute);
new_inst.Offset = i.Offset;
body.Instructions.Insert(j, new_inst);
}
}
}
}
private void InsertEventHandler(bool before, Assembly asm, AssemblyDefinition asmDef, InjectionMethod im, string eventType, Type[] eventArgumentTypes)
{
ModuleDefinition module = asmDef.MainModule;
MethodReference mrHandleEvent = module.ImportReference(asm.GetType("TSML.Event.EventHandler").GetMethod("OnEvent", new Type[] { asm.GetType("TSML.Event.Event") }));
MethodReference eventCtor = module.ImportReference(asm.GetType(eventType).GetConstructor(eventArgumentTypes));
Mono.Cecil.Cil.MethodBody body = im.MethodDef.Body;
ILProcessor proc = body.GetILProcessor();
Instruction target = body.Instructions[before ? 0 : body.Instructions.Count - 1];
List <Instruction> insns = new List <Instruction>();
// Load arguments, index 0 being the object itself
for (int i = 0; i < eventArgumentTypes.Length; i++)
{
insns.Add(proc.Create(OpCodes.Ldarg, i));
}
insns.Add(proc.Create(OpCodes.Newobj, eventCtor));
insns.Add(proc.Create(OpCodes.Call, mrHandleEvent));
foreach (Instruction insn in insns)
{
proc.InsertBefore(target, insn);
}
}
static void FillArgs(MethodDefinition target, Instruction endPoint, Action <MethodDefinition, Instruction, int> parseReferenceProcess)
{
MethodBody targetBody = target.Body;
ILProcessor il = targetBody.GetILProcessor();
int paramCount = target.Parameters.Count + (target.HasThis ? 1 : 0);
for (int i = 0; i < paramCount; ++i)
{
if (i < ldargs.Length)
{
il.InsertBefore(endPoint, il.Create(ldargs[i]));
}
else if (i <= byte.MaxValue)
{
il.InsertBefore(endPoint, il.Create(OpCodes.Ldarg_S, (byte)i));
}
else
{
il.InsertBefore(endPoint, il.Create(OpCodes.Ldarg, (short)i));
}
if (parseReferenceProcess != null)
{
parseReferenceProcess(target, endPoint, i);
}
}
}
public static void FillMMILProxy(ModuleDefinition proxyMod, TypeDefinition proxy, MethodInfo stub)
{
MethodDefinition method = new MethodDefinition(
stub.Name,
MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.Static,
proxyMod.ImportReference(stub.ReturnType)
);
ParameterInfo[] args = stub.GetParameters();
int argsCount = args.Length;
for (int i = 1; i < argsCount; i++)
{
method.Parameters.Add(
new ParameterDefinition(args[i].Name, (ParameterAttributes)args[i].Attributes, proxyMod.ImportReference(args[i].ParameterType))
);
}
--argsCount; // MMILRT contains self as first parameter
MethodBody body = method.Body = new MethodBody(method);
ILProcessor il = body.GetILProcessor();
// Always required to get the MonoModder instance.
il.Emit(OpCodes.Call, proxyMod.ImportReference(m_get_Self));
// Load arguments to stack.
// TODO: What about generic arguments in MMILProxy?
if (argsCount > 0)
{
il.Emit(OpCodes.Ldarg_0);
}
if (argsCount > 1)
{
il.Emit(OpCodes.Ldarg_1);
}
if (argsCount > 2)
{
il.Emit(OpCodes.Ldarg_2);
}
if (argsCount > 3)
{
il.Emit(OpCodes.Ldarg_3);
}
for (int i = 4; i < argsCount && i < 256; i++)
{
il.Emit(OpCodes.Ldarg_S, (byte)i);
}
for (int i = 256; i < argsCount; i++)
{
il.Emit(OpCodes.Ldarg, i);
}
// Call the actual method.
il.Emit(OpCodes.Call, proxyMod.ImportReference(stub));
// Finish it off with a ret.
il.Emit(OpCodes.Ret);
proxy.Methods.Add(method);
}
public virtual void PatchTrampoline(MethodDefinition targetMethod, MethodDefinition method)
{
method.IsManaged = true;
method.IsIL = true;
method.IsNative = false;
method.PInvokeInfo = null;
method.IsInternalCall = false;
method.IsPInvokeImpl = false;
method.NoInlining = true;
MethodBody body = method.Body = new MethodBody(method);
ILProcessor il = body.GetILProcessor();
for (int i = 64; i > -1; --i)
{
il.Emit(OpCodes.Nop);
}
if (method.ReturnType.MetadataType != MetadataType.Void)
{
il.Emit(OpCodes.Ldnull);
if (method.ReturnType.IsValueType)
{
il.Emit(OpCodes.Box, method.ReturnType);
}
}
il.Emit(OpCodes.Ret);
RegisterTrampoline(targetMethod, method);
}
private void ProcessMethodDefinition(MethodDefinition method)
{
MethodBody body = method.Body;
body.SimplifyMacros();
ILProcessor ilProcessor = body.GetILProcessor();
if (body.HasExceptionHandlers)
{
for (int i = 0; i < body.ExceptionHandlers.Count; i++)
{
//This doesn't rethrow per se, but it might be the path to more fine grained control
//var exceptionType = typeof(Exception);
//var exceptionCtor = exceptionType.GetConstructor(new Type[] {});
//var constructorReference = ModuleDefinition.ImportReference(exceptionCtor);
//ilProcessor.InsertBefore(body.ExceptionHandlers[i].HandlerEnd.Previous, Instruction.Create(OpCodes.Newobj, constructorReference));
//ilProcessor.InsertBefore(body.ExceptionHandlers[i].HandlerEnd.Previous, Instruction.Create(OpCodes.Throw));
ilProcessor.Replace(body.ExceptionHandlers[i].HandlerEnd.Previous, Instruction.Create(OpCodes.Rethrow));
}
}
body.InitLocals = true;
body.OptimizeMacros();
}
static void FillCoroutineState(MethodDefinition coroutineCarrier)
{
MethodBody targetBody = coroutineCarrier.Body;
ILProcessor il = targetBody.GetILProcessor();
il.InsertBefore(cursor, il.Create(OpCodes.Ldarg_0));
var stateField = coroutineCarrier.DeclaringType.Fields.Single(field => field.Name == "$PC");
il.InsertBefore(cursor, il.Create(OpCodes.Ldfld, stateField));
}
public static void PatchMethodThatUsedDisplayClassToTreatItAsAStruct(MethodBody body, VariableDefinition displayClassVariable)
{
var displayClassTypeReference = displayClassVariable.VariableType;
var instructions = body.Instructions.ToArray();
var ilProcessor = body.GetILProcessor();
foreach (var instruction in instructions)
{
// We will replace all LdLoc of our displayclass to LdLoca of our displayclass variable that now lives on the stack.
// Except in the case where we are storing a nested DisplayClass!
if ((instruction.IsLoadLocal(out int loadIndex) && displayClassVariable.Index == loadIndex) &&
!(instruction.Next != null && instruction.Next.OpCode == OpCodes.Stfld && (instruction.Next.Operand as FieldReference).IsNestedDisplayClassField()))
{
instruction.OpCode = OpCodes.Ldloca;
instruction.Operand = body.Variables[loadIndex];
}
// We also need to replace and ldfld a nested DisplayClass that we turned into a struct with ldflda
if (instruction.OpCode == OpCodes.Ldfld && ((FieldReference)instruction.Operand).IsNestedDisplayClassField())
{
instruction.OpCode = OpCodes.Ldflda;
}
// Roselyn should never double assign the DisplayClass to a variable, throw if we somehow detect this.
if (instruction.IsStoreLocal(out int storeIndex) && displayClassVariable.Index == storeIndex)
{
InternalCompilerError.DCICE003(body.Method, instruction).Throw();
}
bool IsInstructionNewObjOfDisplayClass(Instruction thisInstruction)
{
return(thisInstruction.OpCode.Code == Code.Newobj && ((MethodReference)thisInstruction.Operand).DeclaringType.TypeReferenceEquals(displayClassTypeReference));
}
// We need to replace the creation of the displayclass object on the heap, with a initobj of the displayclass on the stack.
// The final sequence will be ldloca, initobj (which will replace newobj, stloc.1.
if (IsInstructionNewObjOfDisplayClass(instruction))
{
// Remove next stloc.1 instruction so that we can replace both of these with the instructions below
if (!instruction.Next.IsStoreLocal(out _))
{
InternalCompilerError.DCICE004(body.Method, instruction).Throw();
}
instruction.Next.MakeNOP();
ilProcessor.Replace(instruction, new[]
{
Instruction.Create(OpCodes.Ldloca, displayClassVariable),
Instruction.Create(OpCodes.Initobj, displayClassTypeReference),
});
}
}
}
static void FillJumpInfo(MethodDefinition target, bool bConfirmPopReturnValue)
{
MethodBody targetBody = target.Body;
ILProcessor il = targetBody.GetILProcessor();
if (!bConfirmPopReturnValue)
{
Instruction retIns = il.Create(OpCodes.Ret);
if (!injectType.HasFlag(InjectType.Before))
{
if (cursor.Previous.OpCode == OpCodes.Nop)
{
cursor.Previous.OpCode = retIns.OpCode;
cursor.Previous.Operand = retIns.Operand;
retIns = cursor.Previous;
}
else
{
il.InsertBefore(cursor, retIns);
}
}
else
{
Instruction start = il.Create(OpCodes.Ldloc, flagDef);
if (cursor.Previous.OpCode == OpCodes.Nop)
{
cursor.Previous.OpCode = start.OpCode;
cursor.Previous.Operand = start.Operand;
il.InsertAfter(cursor.Previous, retIns);
}
else
{
il.InsertBefore(cursor, retIns);
il.InsertBefore(retIns, start);
}
Instruction popIns = il.Create(OpCodes.Pop);
bool bGotReturnValue = !target.ReturnVoid();
if (bGotReturnValue)
{
il.InsertBefore(cursor, popIns);
}
il.InsertBefore(retIns, il.Create(ldcI4s[(int)InjectType.Before / 2]));
il.InsertBefore(retIns, il.Create(OpCodes.Ble_Un, bGotReturnValue ? popIns : cursor));
}
}
else if (cursor.Previous.OpCode == OpCodes.Nop)
{
targetBody.Instructions.Remove(cursor.Previous);
}
}
/// <summary>
/// Create a clone of the given method body
/// </summary>
public static MethodBody Clone(this MethodBody source, MethodDefinition target)
{
var result = new MethodBody(target) { InitLocals = source.InitLocals, MaxStackSize = source.MaxStackSize };
var worker = result.GetILProcessor();
foreach (var i in source.Instructions)
{
// Poor mans clone, but sufficient for our needs
var clone = Instruction.Create(OpCodes.Nop);
clone.OpCode = i.OpCode;
clone.Operand = i.Operand;
worker.Append(clone);
}
return result;
}
public static void ILMethodIntrument(MethodDefinition md, long methodID, MethodReference startMR, MethodReference endMR)
{
Mono.Cecil.Cil.MethodBody mb = md.Body;
Instruction startInst;
List <Instruction> endInst = new List <Instruction>();
Console.WriteLine(" -- StartMSpan");
foreach (Instruction inst in mb.Instructions)
{
switch (inst.OpCode.Code)
{
case Code.Ret:
case Code.Throw:
case Code.Rethrow:
endInst.Add(inst);
Console.WriteLine(" -- EndMSpan");
break;
}
Console.WriteLine(inst.OpCode.Name);
}
mb.InitLocals = true;
VariableDefinition vd = new VariableDefinition(startMR.ReturnType);
mb.Variables.Add(vd);
ILProcessor ilp = mb.GetILProcessor();
startInst = mb.Instructions[0];
if (startInst.OpCode.Code != Code.Nop)
{
ilp.InsertBefore(startInst, ilp.Create(OpCodes.Nop));
startInst = mb.Instructions[0];
}
ilp.InsertBefore(startInst, ilp.Create(OpCodes.Nop));
ilp.InsertBefore(startInst, ilp.Create(OpCodes.Ldc_I8, methodID));
ilp.InsertBefore(startInst, ilp.Create(OpCodes.Call, startMR));
ilp.InsertBefore(startInst, ilp.Create(OpCodes.Stloc, vd));
foreach (Instruction inst in endInst)
{
ilp.InsertBefore(inst, ilp.Create(OpCodes.Ldloc, vd));
ilp.InsertBefore(inst, ilp.Create(OpCodes.Call, endMR));
}
ilp.Body.OptimizeMacros();
}
public MethodBodyPatcher(string methodName, MethodDefinition method)
{
_methodName = methodName;
_methodBody = method.Body;
_processor = _methodBody.GetILProcessor();
_realBodyStart = _methodBody.Instructions.First();
_realBodyEnd = _methodBody.Instructions.Last();
_markStart1BeforeCreateArgumentsArray = _processor.Create(OpCodes.Nop);
_markStart2BeforeCreateMethodExecutionArgs = _processor.Create(OpCodes.Nop);
_markStart3BeforeOnEntryCall = _processor.Create(OpCodes.Nop);
_markStart4BeforeRealBodyStartExceptionHandler = _processor.Create(OpCodes.Nop);
_markEnd1NewRealBodyEnd = _processor.Create(OpCodes.Nop);
_markEnd2BeforeOnExitCall = _processor.Create(OpCodes.Nop);
_markRetNew = EndsWithThrow ? _processor.Create(OpCodes.Throw) : _processor.Create(OpCodes.Ret);
}
public void AddInstruction()
{
var object_ref = new TypeReference ("System", "Object", null, null, false);
var method = new MethodDefinition ("foo", MethodAttributes.Static, object_ref);
var body = new MethodBody (method);
var il = body.GetILProcessor ();
var first = il.Create (OpCodes.Nop);
var second = il.Create (OpCodes.Nop);
body.Instructions.Add (first);
body.Instructions.Add (second);
Assert.IsNull (first.Previous);
Assert.AreEqual (second, first.Next);
Assert.AreEqual (first, second.Previous);
Assert.IsNull (second.Next);
}
static Action <MethodDefinition, InjectType> GetCoroutineInjectInfoFiller(MethodDefinition coroutineCreator, FieldDefinition hostRef)
{
return((coroutineCarrier, runtimeInjectType) =>
{
MethodBody targetBody = coroutineCarrier.Body;
ILProcessor il = targetBody.GetILProcessor();
il.InsertBefore(cursor, il.Create(OpCodes.Ldloc, funcDef));
if (coroutineCreator.HasThis)
{
il.InsertBefore(cursor, il.Create(OpCodes.Ldarg_0));
il.InsertBefore(cursor, il.Create(OpCodes.Ldfld, hostRef));
}
CopyCarrierFieldsToArg(coroutineCreator, coroutineCarrier);
FillCoroutineState(coroutineCarrier);
il.InsertBefore(cursor, il.Create(OpCodes.Call, GetLuaMethodInvoker(coroutineCreator, true, true)));
});
}
static void FillBaseCall(MethodDefinition target, InjectType runtimeInjectType, bool preCall)
{
MethodBody targetBody = target.Body;
ILProcessor il = targetBody.GetILProcessor();
InjectType curBaseInjectType = preCall ? InjectType.ReplaceWithPreInvokeBase : InjectType.ReplaceWithPostInvokeBase;
if (runtimeInjectType.HasFlag(curBaseInjectType))
{
Instruction end = il.Create(OpCodes.Nop);
il.InsertBefore(cursor, end);
il.InsertBefore(end, il.Create(OpCodes.Ldloc, flagDef));
il.InsertBefore(end, il.Create(OpCodes.Ldc_I4, (int)curBaseInjectType));
il.InsertBefore(end, il.Create(OpCodes.Bne_Un, end));
FillArgs(target, end, PostProcessBaseMethodArg);
il.InsertBefore(end, il.Create(OpCodes.Call, target.GetBaseMethodInstance()));
if (!target.ReturnVoid())
{
il.InsertBefore(end, il.Create(OpCodes.Pop));
}
}
}
private MsilBodyGenerator(MethodDefinition method)
{
_module = method.Module;
_method = method;
_body = method.Body = new MethodBody(method);
_processor = _body.GetILProcessor();
_elementTypes = new[]
{
_module.TypeSystem.Void.Resolve(),
_module.TypeSystem.Boolean.Resolve(),
_module.TypeSystem.Char.Resolve(),
_module.TypeSystem.String.Resolve(),
_module.TypeSystem.Byte.Resolve(),
_module.TypeSystem.SByte.Resolve(),
_module.TypeSystem.UInt16.Resolve(),
_module.TypeSystem.Int16.Resolve(),
_module.TypeSystem.UInt32.Resolve(),
_module.TypeSystem.Int32.Resolve(),
_module.TypeSystem.UInt64.Resolve(),
_module.TypeSystem.Int64.Resolve(),
};
}
static void FillBegin(MethodDefinition target, int methodIndex)
{
MethodBody targetBody = target.Body;
ILProcessor il = targetBody.GetILProcessor();
targetBody.InitLocals = true;
flagDef = new VariableDefinition(injectFlagTypeRef);
funcDef = new VariableDefinition(luaFunctionTypeDef);
targetBody.Variables.Add(flagDef);
targetBody.Variables.Add(funcDef);
Instruction startInsertPos = targetBody.Instructions[0];
il.InsertBefore(startInsertPos, il.Create(OpCodes.Ldc_I4, methodIndex));
il.InsertBefore(startInsertPos, il.Create(OpCodes.Call, injectFlagGetter));
il.InsertBefore(startInsertPos, il.Create(OpCodes.Stloc, flagDef));
il.InsertBefore(startInsertPos, il.Create(OpCodes.Ldloc, flagDef));
il.InsertBefore(startInsertPos, il.Create(OpCodes.Brfalse, startInsertPos));
il.InsertBefore(startInsertPos, il.Create(OpCodes.Ldc_I4, methodIndex));
il.InsertBefore(startInsertPos, il.Create(OpCodes.Call, injectedFuncGetter));
il.InsertBefore(startInsertPos, il.Create(OpCodes.Stloc, funcDef));
offset = targetBody.Instructions.IndexOf(startInsertPos);
}
#pragma warning restore xUnit1019
public void CorrectBranchSizes_CorrectsOpCodeFromShortOne_IfOffsetDoesNotFitSByte(OpCode opCode)
{
var body = new MethodBody(new MethodDefinition("", 0, new TypeReference("", "", null, null)));
var il = body.GetILProcessor();
var target = il.Create(OpCodes.Ret);
il.Emit(opCode, target);
for (var i = 0; i < 129; i++)
{
il.Emit(OpCodes.Nop);
}
il.InsertAfter(body.Instructions.Last(), target);
il.CorrectAllAfterChanges();
var corrected = body.Instructions.First();
Assert.Equal(
Regex.Replace(opCode.Code.ToString(), "_S$", ""),
corrected.OpCode.Code.ToString()
);
}
static void FillInjectMethod(MethodDefinition target, Action <MethodDefinition, InjectType> fillInjectInfo, InjectType runtimeInjectType)
{
if (runtimeInjectType == InjectType.None)
{
return;
}
MethodBody targetBody = target.Body;
ILProcessor il = targetBody.GetILProcessor();
cursor = GetMethodNextInsertPosition(target, null, runtimeInjectType.HasFlag(InjectType.After));
while (cursor != null)
{
bool bAfterInject = runtimeInjectType == InjectType.After;
Instruction startPos = il.Create(OpCodes.Ldloc, flagDef);
if (bAfterInject)
{
/// Replace instruction with references reserved
Instruction endPos = il.Create(OpCodes.Ret);
int replaceIndex = targetBody.Instructions.IndexOf(cursor);
cursor.OpCode = startPos.OpCode;
cursor.Operand = startPos.Operand;
il.InsertAfter(targetBody.Instructions[replaceIndex], endPos);
cursor = targetBody.Instructions[replaceIndex + 1];
}
else
{
il.InsertBefore(cursor, startPos);
}
il.InsertBefore(cursor, il.Create(ldcI4s[(int)InjectType.After / 2]));
il.InsertBefore(cursor, il.Create(bAfterInject ? OpCodes.Bne_Un : OpCodes.Ble_Un, cursor));
fillInjectInfo(target, runtimeInjectType);
cursor = GetMethodNextInsertPosition(target, cursor, runtimeInjectType.HasFlag(InjectType.After));
}
}
static void FillReplaceCoroutine(MethodDefinition target, InjectType runtimeInjectType)
{
if (runtimeInjectType == InjectType.None)
{
return;
}
MethodBody targetBody = target.Body;
ILProcessor il = targetBody.GetILProcessor();
cursor = GetMethodNextInsertPosition(target, null, false);
if (cursor != null)
{
il.InsertBefore(cursor, il.Create(OpCodes.Ldloc, flagDef));
il.InsertBefore(cursor, il.Create(ldcI4s[(int)InjectType.Replace / 2]));
il.InsertBefore(cursor, il.Create(OpCodes.Bne_Un, cursor));
il.InsertBefore(cursor, il.Create(OpCodes.Ldloc, funcDef));
FillArgs(target, cursor, null);
il.InsertBefore(cursor, il.Create(OpCodes.Call, GetLuaMethodInvoker(target, false, false)));
il.InsertBefore(cursor, il.Create(OpCodes.Ret));
}
}
public override void VisitMethodBody(MethodBody body)
{
_body = body;
_il = body.GetILProcessor();
}
public override void ProcessType(TypeDefinition type)
{
if (!type.Is ("System.Net.Http", "HttpClient"))
return;
MethodDefinition default_ctor = null;
MethodDefinition full_ctor = null;
foreach (var m in type.Methods) {
if (m.IsStatic || !m.IsConstructor)
continue;
if (!m.HasParameters) {
default_ctor = m;
} else if (m.Parameters.Count == 2) {
full_ctor = m;
}
}
if (default_ctor == null || full_ctor == null)
throw new Exception ("Could not set the default HttpMessageHandler");
var handler = RuntimeOptions.GetHttpMessageHandler (Options.RuntimeOptions, type.Module);
MethodDefinition handler_ctor = null;
foreach (var m in handler.Methods) {
if (m.IsStatic || !m.IsConstructor || m.HasParameters)
continue;
handler_ctor = m;
break;
}
// re-write default ctor
var body = new MethodBody (default_ctor);
var il = body.GetILProcessor ();
il.Emit (OpCodes.Ldarg_0);
il.Emit (OpCodes.Newobj, handler_ctor);
il.Emit (OpCodes.Ldc_I4_1);
il.Emit (OpCodes.Call, full_ctor);
il.Emit (OpCodes.Ret);
default_ctor.Body = body;
}
private MethodBody GenerateDelegateMethod(MethodDefinition method, Class declaringClass)
{
// Delegate type
var delegateType = corlib.MainModule.GetType(typeof(Delegate).FullName);
// Delegate fields
var targetField = delegateType.Fields.First(x => x.Name == "_target");
var methodPtrField = delegateType.Fields.First(x => x.Name == "_methodPtr");
var methodPtrAuxField = delegateType.Fields.First(x => x.Name == "_methodPtrAux");
var body = new MethodBody(method);
var il = body.GetILProcessor();
if (method.Name == ".ctor")
{
// Mark
//GenerateMulticastInvokeThunk(declaringClass);
// Two main cases:
// - Instance method:
// this._methodPtr = fnptr;
// this._target = target;
// Result: this._methodPtr(this._target, arg1, ..) will directly work
// - Static method:
// this._target = this;
// this._methodPtrAux = fnptr;
// this._methodPtr = (delegate, arg1, ...) => { delegate->_methodPtrAux(arg1, ...); }
// Result: this._methodPtr(this._target, arg1, ...) will call thunk,
// which will call fnptr (from this._target._methodPtr) without the first argument
var target = Instruction.Create(OpCodes.Ldarg_0);
// if (target == null)
// {
il.Append(Instruction.Create(OpCodes.Ldarg, method.Parameters[0]));
il.Append(Instruction.Create(OpCodes.Brtrue, target));
// Generate thunk (for now, done using direct LLVM, not sure weither LLVM or IL is better)
// this._methodPtr = (delegate, arg1, ...) => { delegate->_methodPtrAux(arg1, ...); }
var invokeMethodHelper = GenerateStaticInvokeThunk(declaringClass);
// Fake Nop to push this thunk on stack (TODO: Better way to do this? i.e. store it in some static field?)
il.Append(Instruction.Create(OpCodes.Ldarg_0));
var loadFunctionPointerInstruction = Instruction.Create(OpCodes.Nop);
InstructionActions.Add(loadFunctionPointerInstruction, (stack) =>
{
// Push the generated method pointer on the stack
stack.Add(new StackValue(StackValueType.NativeInt, intPtr,
LLVM.BuildPointerCast(builder, invokeMethodHelper, intPtrLLVM, string.Empty)));
});
il.Append(loadFunctionPointerInstruction);
il.Append(Instruction.Create(OpCodes.Stfld, methodPtrField));
// this._methodPtrAux = method;
il.Append(Instruction.Create(OpCodes.Ldarg_0));
il.Append(Instruction.Create(OpCodes.Ldarg, method.Parameters[1]));
il.Append(Instruction.Create(OpCodes.Stfld, methodPtrAuxField));
// this._target = this;
il.Append(Instruction.Create(OpCodes.Ldarg_0));
il.Append(Instruction.Create(OpCodes.Ldarg_0));
il.Append(Instruction.Create(OpCodes.Stfld, targetField));
// return;
// }
il.Append(Instruction.Create(OpCodes.Ret));
// this._target = target;
il.Append(target);
il.Append(Instruction.Create(OpCodes.Ldarg, method.Parameters[0]));
il.Append(Instruction.Create(OpCodes.Stfld, targetField));
// this._methodPtr = method;
il.Append(Instruction.Create(OpCodes.Ldarg_0));
il.Append(Instruction.Create(OpCodes.Ldarg, method.Parameters[1]));
il.Append(Instruction.Create(OpCodes.Stfld, methodPtrField));
// return;
il.Append(Instruction.Create(OpCodes.Ret));
}
else if (method.Name == "GetMulticastDispatchMethod")
{
var invokeMethodHelper = GenerateMulticastInvokeThunk(declaringClass);
var loadFunctionPointerInstruction = Instruction.Create(OpCodes.Nop);
InstructionActions.Add(loadFunctionPointerInstruction, (stack) =>
{
// Push the generated method pointer on the stack
stack.Add(new StackValue(StackValueType.NativeInt, intPtr,
LLVM.BuildPointerCast(builder, invokeMethodHelper, intPtrLLVM, string.Empty)));
});
il.Append(loadFunctionPointerInstruction);
il.Append(Instruction.Create(OpCodes.Ret));
}
else if (method.Name == "Invoke")
{
// For now, generate IL
// Note that we could probably optimize at callsite too,
// but probably not necessary if LLVM and sealed class are optimized/inlined well enough
// ldarg_0
// ldfld _target
il.Append(Instruction.Create(OpCodes.Ldarg_0));
il.Append(Instruction.Create(OpCodes.Ldfld, targetField));
var callsite = new CallSite(method.ReturnType);
callsite.Parameters.Add(new ParameterDefinition(targetField.FieldType));
foreach (var parameter in method.Parameters)
{
callsite.Parameters.Add(new ParameterDefinition(parameter.Name, parameter.Attributes, parameter.ParameterType));
// ldarg
il.Append(Instruction.Create(OpCodes.Ldarg, parameter));
}
// ldarg_0
// ldfld _methodPtr
il.Append(Instruction.Create(OpCodes.Ldarg_0));
il.Append(Instruction.Create(OpCodes.Ldfld, methodPtrField));
// calli
il.Append(Instruction.Create(OpCodes.Calli, callsite));
// ret
il.Append(Instruction.Create(OpCodes.Ret));
}
else
{
LLVM.BuildUnreachable(builder);
return null;
}
return body;
}
public static void Emit(this MethodBody body, Action <ILProcessor> il)
{
il(body.GetILProcessor());
}
private void InnerProcess(MethodDefinition method, bool returnVoid, ReferenceContainer references)
{
body = method.Body;
body.SimplifyMacros();
if (body.Instructions.Count <= 3)
return; // nothing to do (empty method)
HandleReturnType(method, returnVoid, references);
var ilProcessor = body.GetILProcessor();
var firstInstruction = FirstInstructionSkipCtor(method);
firstInstruction = RejigFirstInstruction(ilProcessor, firstInstruction);
InjectContext(ilProcessor, firstInstruction, method, references);
var returnInstruction = FixReturns();
var beforeReturn = Instruction.Create(OpCodes.Nop);
ilProcessor.InsertBefore(returnInstruction, beforeReturn);
// exclude try-catch from constructors (lot's of pain otherwise)
if (!method.IsConstructor)
{
var beginCatch = InjectIlForCatch(ilProcessor, beforeReturn, references);
var beginFinally = InjectIlForFinaly(ilProcessor, beforeReturn, references);
var catchHandler = new ExceptionHandler(ExceptionHandlerType.Catch)
{
TryStart = firstInstruction,
TryEnd = beginCatch,
CatchType = references.ExceptionType,
HandlerStart = beginCatch,
HandlerEnd = beginFinally,
};
body.ExceptionHandlers.Add(catchHandler);
var finallyHandler = new ExceptionHandler(ExceptionHandlerType.Finally)
{
TryStart = firstInstruction,
TryEnd = beginFinally,
HandlerStart = beginFinally,
HandlerEnd = beforeReturn,
};
body.ExceptionHandlers.Add(finallyHandler);
}
else
{
InjectIlForDispose(ilProcessor, returnInstruction, references);
}
body.InitLocals = true;
body.OptimizeMacros();
}
private void Inject()
{
body = Method.Body;
body.SimplifyMacros();
var ilProcessor = body.GetILProcessor();
var returnFixer = new ReturnFixer
{
Method = Method
};
returnFixer.MakeLastStatementReturn();
var methodBodyFirstInstruction = GetMethodBodyFirstInstruction();
var startInstructions = new List <Instruction>();
startInstructions.AddRange(GetStartInstructions());
foreach (var instruction in startInstructions)
{
ilProcessor.InsertBefore(methodBodyFirstInstruction, instruction);
}
var paramInstructions = GetParamInstructions();
paramInstructions.Reverse();
if (paramInstructions.Any())
{
foreach (var instruction in paramInstructions)
{
ilProcessor.InsertAfter(startInstructions.Last(), instruction);
}
}
ilProcessor.InsertBefore(returnFixer.NopBeforeReturn, GetReturnValueInstructions(returnFixer.ReturnVariable));
var tryCatchLeaveInstructions = Instruction.Create(OpCodes.Leave, returnFixer.NopBeforeReturn);
var catchInstructions = new List <Instruction>();
catchInstructions.AddRange(GetCatchInstructions());
ilProcessor.InsertBefore(returnFixer.NopBeforeReturn, tryCatchLeaveInstructions);
ilProcessor.InsertBefore(returnFixer.NopBeforeReturn, catchInstructions);
var endInstructions = new List <Instruction>();
endInstructions.AddRange(GetEndInstructions());
var finallyInstruction = Instruction.Create(OpCodes.Endfinally);
endInstructions.Add(finallyInstruction);
endInstructions.Reverse();
foreach (var instruction in endInstructions)
{
ilProcessor.InsertAfter(catchInstructions.Last(), instruction);
}
var handler = new ExceptionHandler(ExceptionHandlerType.Catch)
{
CatchType = ExceptionType,
TryStart = methodBodyFirstInstruction,
TryEnd = tryCatchLeaveInstructions.Next,
HandlerStart = catchInstructions.First(),
HandlerEnd = catchInstructions.Last().Next
};
body.ExceptionHandlers.Add(handler);
handler = new ExceptionHandler(ExceptionHandlerType.Finally)
{
TryStart = methodBodyFirstInstruction,
TryEnd = catchInstructions.Last().Next,
HandlerStart = catchInstructions.Last().Next,
HandlerEnd = finallyInstruction.Next
};
body.ExceptionHandlers.Add(handler);
var instructions = body.Instructions;
Instruction doubleDupInstruction = null;
for (var index = 0; index < instructions.Count; index++)
{
var instruction = instructions[index];
if (instruction.OpCode == OpCodes.Dup && instructions[index + 1].OpCode == OpCodes.Dup)
{
doubleDupInstruction = instructions[index + 1];
}
if (instruction.OpCode == OpCodes.Pop && doubleDupInstruction != null)
{
var extraPopInstruction = instructions[index];
ilProcessor.Remove(extraPopInstruction);
ilProcessor.InsertAfter(doubleDupInstruction, extraPopInstruction);
doubleDupInstruction = null;
}
}
body.InitLocals = true;
body.OptimizeMacros();
}
/// <summary>
/// Processes the instructions replacing all strings being loaded with an encrypted version.
/// </summary>
/// <param name="assemblyDef">The assembly definition.</param>
/// <param name="body">The body.</param>
/// <param name="decryptMethod">The decrypt method.</param>
private void ProcessInstructions(AssemblyDefinition assemblyDef, MethodBody body, MethodReference decryptMethod)
{
var instructions = body.Instructions;
var il = body.GetILProcessor();
List<Instruction> instructionsToExpand = new List<Instruction>();
List<int> offsets = new List<int>();
foreach (Instruction instruction in instructions)
{
//Find the call statement
switch (instruction.OpCode.Name)
{
case "ldstr":
//We've found a string load message - we need to replace this instruction
if (instruction.Operand is string) //Only do the direct strings for now
instructionsToExpand.Add(instruction);
break;
}
}
//Fix each ldstr instruction found
foreach (Instruction instruction in instructionsToExpand)
{
//What we do is replace the ldstr "bla" with:
//ldstr bytearray encrypted_array
//ldc.i4 random_integer
//call string class Decrypt(string, int32)
//First get the original value
string originalValue = instruction.Operand.ToString();
offsets.Add(instruction.Offset);
//Secondly generate a random integer as a salt
int salt = random.Next(5000, 10000);
//Now we need to work out what the encrypted value is and set the operand
OutputHelper.WriteLine("Encrypting string \"{0}\"", originalValue);
string byteArray = EncryptString(originalValue, salt);
Instruction loadString = il.Create(OpCodes.Ldstr, byteArray);
il.Replace(instruction, loadString);
//Now load the salt
Instruction loadSalt = il.Create(OpCodes.Ldc_I4, salt);
il.InsertAfter(loadString, loadSalt);
//Process the decryption
Instruction call = il.Create(OpCodes.Call, decryptMethod);
il.InsertAfter(loadSalt, call);
}
//Unfortunately one thing Mono.Cecil doesn't do is adjust instruction offsets for branch statements
//and exception handling start points. We need to fix these manually
if (offsets.Count == 0)
return;
//Do the adjustments
il.AdjustOffsets(body, offsets, 6 + assemblyDef.GetAddressSize());
}
private void _CopyMethodToDefinition()
{
MethodBase method = OriginalMethod;
Module moduleFrom = method.Module;
System.Reflection.MethodBody bodyFrom = method.GetMethodBody();
byte[] data = bodyFrom?.GetILAsByteArray();
if (data == null)
{
throw new NotSupportedException("Body-less method");
}
MethodDefinition def = Definition;
ModuleDefinition moduleTo = def.Module;
Mono.Cecil.Cil.MethodBody bodyTo = def.Body;
ILProcessor processor = bodyTo.GetILProcessor();
Type[] typeArguments = null;
if (method.DeclaringType.IsGenericType)
{
typeArguments = method.DeclaringType.GetGenericArguments();
}
Type[] methodArguments = null;
if (method.IsGenericMethod)
{
methodArguments = method.GetGenericArguments();
}
foreach (LocalVariableInfo info in bodyFrom.LocalVariables)
{
TypeReference type = moduleTo.ImportReference(info.LocalType);
if (info.IsPinned)
{
type = new PinnedType(type);
}
bodyTo.Variables.Add(new VariableDefinition(type));
}
using (BinaryReader reader = new BinaryReader(new MemoryStream(data))) {
while (reader.BaseStream.Position < reader.BaseStream.Length)
{
int offset = (int)reader.BaseStream.Position;
Instruction instr = Instruction.Create(OpCodes.Nop);
byte op = reader.ReadByte();
instr.OpCode = op != 0xfe ? _CecilOpCodes1X[op] : _CecilOpCodes2X[reader.ReadByte()];
instr.Offset = offset;
ReadOperand(reader, instr);
bodyTo.Instructions.Add(instr);
}
}
foreach (Instruction instr in bodyTo.Instructions)
{
switch (instr.OpCode.OperandType)
{
case OperandType.ShortInlineBrTarget:
case OperandType.InlineBrTarget:
instr.Operand = GetInstruction((int)instr.Operand);
break;
case OperandType.InlineSwitch:
int[] offsets = (int[])instr.Operand;
Instruction[] targets = new Instruction[offsets.Length];
for (int i = 0; i < offsets.Length; i++)
{
targets[i] = GetInstruction(offsets[i]);
}
instr.Operand = targets;
break;
}
}
foreach (ExceptionHandlingClause clause in bodyFrom.ExceptionHandlingClauses)
{
ExceptionHandler handler = new ExceptionHandler((ExceptionHandlerType)clause.Flags);
bodyTo.ExceptionHandlers.Add(handler);
handler.TryStart = GetInstruction(clause.TryOffset);
handler.TryEnd = GetInstruction(clause.TryOffset + clause.TryLength);
handler.FilterStart = handler.HandlerType != ExceptionHandlerType.Filter ? null : GetInstruction(clause.FilterOffset);
handler.HandlerStart = GetInstruction(clause.HandlerOffset);
handler.HandlerEnd = GetInstruction(clause.HandlerOffset + clause.HandlerLength);
handler.CatchType = handler.HandlerType != ExceptionHandlerType.Catch ? null : clause.CatchType == null ? null : moduleTo.ImportReference(clause.CatchType);
}
void ReadOperand(BinaryReader reader, Instruction instr)
{
int index, offs, length;
switch (instr.OpCode.OperandType)
{
case OperandType.InlineNone:
instr.Operand = null;
break;
case OperandType.InlineSwitch:
length = reader.ReadInt32();
offs = (int)reader.BaseStream.Position + (4 * length);
int[] targets = new int[length];
for (int i = 0; i < length; i++)
{
targets[i] = reader.ReadInt32() + offs;
}
instr.Operand = targets;
break;
case OperandType.ShortInlineBrTarget:
offs = reader.ReadSByte();
instr.Operand = (int)reader.BaseStream.Position + offs;
break;
case OperandType.InlineBrTarget:
offs = reader.ReadInt32();
instr.Operand = (int)reader.BaseStream.Position + offs;
break;
case OperandType.ShortInlineI:
instr.Operand = instr.OpCode == OpCodes.Ldc_I4_S ? reader.ReadSByte() : (object)reader.ReadByte();
break;
case OperandType.InlineI:
instr.Operand = reader.ReadInt32();
break;
case OperandType.ShortInlineR:
instr.Operand = reader.ReadSingle();
break;
case OperandType.InlineR:
instr.Operand = reader.ReadDouble();
break;
case OperandType.InlineI8:
instr.Operand = reader.ReadInt64();
break;
case OperandType.InlineSig:
throw new NotSupportedException("Parsing CallSites at runtime currently not supported");
case OperandType.InlineString:
instr.Operand = moduleFrom.ResolveString(reader.ReadInt32());
break;
case OperandType.InlineTok:
switch (moduleFrom.ResolveMember(reader.ReadInt32(), typeArguments, methodArguments))
{
case Type i:
instr.Operand = moduleTo.ImportReference(i);
break;
case FieldInfo i:
instr.Operand = moduleTo.ImportReference(i);
break;
case MethodBase i:
instr.Operand = moduleTo.ImportReference(i);
break;
}
break;
case OperandType.InlineType:
instr.Operand = moduleTo.ImportReference(moduleFrom.ResolveType(reader.ReadInt32(), typeArguments, methodArguments));
break;
case OperandType.InlineMethod:
instr.Operand = moduleTo.ImportReference(moduleFrom.ResolveMethod(reader.ReadInt32(), typeArguments, methodArguments));
break;
case OperandType.InlineField:
instr.Operand = moduleTo.ImportReference(moduleFrom.ResolveField(reader.ReadInt32(), typeArguments, methodArguments));
break;
case OperandType.ShortInlineVar:
case OperandType.InlineVar:
index = instr.OpCode.OperandType == OperandType.ShortInlineVar ? reader.ReadByte() : reader.ReadInt16();
instr.Operand = bodyTo.Variables[index];
break;
case OperandType.InlineArg:
case OperandType.ShortInlineArg:
index = instr.OpCode.OperandType == OperandType.ShortInlineArg ? reader.ReadByte() : reader.ReadInt16();
instr.Operand = def.Parameters[index];
break;
case OperandType.InlinePhi: // No opcode seems to use this
default:
throw new NotSupportedException($"Unsupported opcode ${instr.OpCode.Name}");
}
}
Instruction GetInstruction(int offset)
{
int last = bodyTo.Instructions.Count - 1;
if (offset < 0 || offset > bodyTo.Instructions[last].Offset)
{
return(null);
}
int min = 0;
int max = last;
while (min <= max)
{
int mid = min + ((max - min) / 2);
Instruction instr = bodyTo.Instructions[mid];
if (offset == instr.Offset)
{
return(instr);
}
if (offset < instr.Offset)
{
max = mid - 1;
}
else
{
min = mid + 1;
}
}
return(null);
}
}
public bool Compile()
{
LogLine(1, "Compiling Xaml");
LogLine(1, "\nAssembly: {0}", Assembly);
if (!string.IsNullOrEmpty(DependencyPaths))
LogLine(1, "DependencyPaths: \t{0}", DependencyPaths);
if (!string.IsNullOrEmpty(ReferencePath))
LogLine(1, "ReferencePath: \t{0}", ReferencePath.Replace("//", "/"));
LogLine(3, "DebugSymbols:\"{0}\"", DebugSymbols);
var skipassembly = true; //change this to false to enable XamlC by default
bool success = true;
if (!File.Exists(Assembly))
{
LogLine(1, "Assembly file not found. Skipping XamlC.");
return true;
}
var resolver = new XamlCAssemblyResolver();
if (!string.IsNullOrEmpty(DependencyPaths))
{
foreach (var dep in DependencyPaths.Split(';'))
{
LogLine(3, "Adding searchpath {0}", dep);
resolver.AddSearchDirectory(dep);
}
}
if (!string.IsNullOrEmpty(ReferencePath))
{
var paths = ReferencePath.Replace("//", "/").Split(';');
foreach (var p in paths)
{
var searchpath = Path.GetDirectoryName(p);
LogLine(3, "Adding searchpath {0}", searchpath);
resolver.AddSearchDirectory(searchpath);
// LogLine (3, "Referencing {0}", p);
// resolver.AddAssembly (p);
}
}
var assemblyDefinition = AssemblyDefinition.ReadAssembly(Path.GetFullPath(Assembly), new ReaderParameters
{
AssemblyResolver = resolver,
ReadSymbols = DebugSymbols
});
CustomAttribute xamlcAttr;
if (assemblyDefinition.HasCustomAttributes &&
(xamlcAttr =
assemblyDefinition.CustomAttributes.FirstOrDefault(
ca => ca.AttributeType.FullName == "Xamarin.Forms.Xaml.XamlCompilationAttribute")) != null)
{
var options = (XamlCompilationOptions)xamlcAttr.ConstructorArguments[0].Value;
if ((options & XamlCompilationOptions.Skip) == XamlCompilationOptions.Skip)
skipassembly = true;
if ((options & XamlCompilationOptions.Compile) == XamlCompilationOptions.Compile)
skipassembly = false;
}
foreach (var module in assemblyDefinition.Modules)
{
var skipmodule = skipassembly;
if (module.HasCustomAttributes &&
(xamlcAttr =
module.CustomAttributes.FirstOrDefault(
ca => ca.AttributeType.FullName == "Xamarin.Forms.Xaml.XamlCompilationAttribute")) != null)
{
var options = (XamlCompilationOptions)xamlcAttr.ConstructorArguments[0].Value;
if ((options & XamlCompilationOptions.Skip) == XamlCompilationOptions.Skip)
skipmodule = true;
if ((options & XamlCompilationOptions.Compile) == XamlCompilationOptions.Compile)
skipmodule = false;
}
LogLine(2, " Module: {0}", module.Name);
var resourcesToPrune = new List<EmbeddedResource>();
foreach (var resource in module.Resources.OfType<EmbeddedResource>())
{
Log(2, " Resource: {0}... ", resource.Name);
string classname;
if (!resource.IsXaml(out classname))
{
LogLine(2, "skipped.");
continue;
}
TypeDefinition typeDef = module.GetType(classname);
if (typeDef == null)
{
LogLine(2, "no type found... skipped.");
continue;
}
var skiptype = skipmodule;
if (typeDef.HasCustomAttributes &&
(xamlcAttr =
typeDef.CustomAttributes.FirstOrDefault(
ca => ca.AttributeType.FullName == "Xamarin.Forms.Xaml.XamlCompilationAttribute")) != null)
{
var options = (XamlCompilationOptions)xamlcAttr.ConstructorArguments[0].Value;
if ((options & XamlCompilationOptions.Skip) == XamlCompilationOptions.Skip)
skiptype = true;
if ((options & XamlCompilationOptions.Compile) == XamlCompilationOptions.Compile)
skiptype = false;
}
if (skiptype)
{
LogLine(2, "Has XamlCompilationAttribute set to Skip and not Compile... skipped");
continue;
}
var initComp = typeDef.Methods.FirstOrDefault(md => md.Name == "InitializeComponent");
if (initComp == null)
{
LogLine(2, "no InitializeComponent found... skipped.");
continue;
}
LogLine(2, "");
Log(2, " Parsing Xaml... ");
var rootnode = ParseXaml(resource.GetResourceStream(), typeDef);
if (rootnode == null)
{
LogLine(2, "failed.");
continue;
}
LogLine(2, "done.");
hasCompiledXamlResources = true;
try
{
Log(2, " Replacing {0}.InitializeComponent ()... ", typeDef.Name);
var body = new MethodBody(initComp);
var il = body.GetILProcessor();
il.Emit(OpCodes.Nop);
var visitorContext = new ILContext(il, body);
rootnode.Accept(new XamlNodeVisitor((node, parent) => node.Parent = parent), null);
rootnode.Accept(new ExpandMarkupsVisitor(visitorContext), null);
rootnode.Accept(new CreateObjectVisitor(visitorContext), null);
rootnode.Accept(new SetNamescopesAndRegisterNamesVisitor(visitorContext), null);
rootnode.Accept(new SetFieldVisitor(visitorContext), null);
rootnode.Accept(new SetResourcesVisitor(visitorContext), null);
rootnode.Accept(new SetPropertiesVisitor(visitorContext, true), null);
il.Emit(OpCodes.Ret);
initComp.Body = body;
}
catch (XamlParseException xpe)
{
LogLine(2, "failed.");
LogError(null, null, null, resource.Name, xpe.XmlInfo.LineNumber, xpe.XmlInfo.LinePosition, 0, 0, xpe.Message,
xpe.HelpLink, xpe.Source);
LogLine(4, xpe.StackTrace);
success = false;
continue;
}
catch (XmlException xe)
{
LogLine(2, "failed.");
LogError(null, null, null, resource.Name, xe.LineNumber, xe.LinePosition, 0, 0, xe.Message, xe.HelpLink, xe.Source);
LogLine(4, xe.StackTrace);
success = false;
continue;
}
catch (Exception e)
{
LogLine(2, "failed.");
LogError(null, null, null, resource.Name, 0, 0, 0, 0, e.Message, e.HelpLink, e.Source);
LogLine(4, e.StackTrace);
success = false;
continue;
}
LogLine(2, "done.");
if (OptimizeIL)
{
Log(2, " Optimizing IL... ");
initComp.Body.OptimizeMacros();
LogLine(2, "done");
}
if (OutputGeneratedILAsCode)
{
var filepath = Path.Combine(Path.GetDirectoryName(Assembly), typeDef.FullName + ".decompiled.cs");
Log(2, " Decompiling {0} into {1}...", typeDef.FullName, filepath);
var decompilerContext = new DecompilerContext(module);
using (var writer = new StreamWriter(filepath))
{
var output = new PlainTextOutput(writer);
var codeDomBuilder = new AstBuilder(decompilerContext);
codeDomBuilder.AddType(typeDef);
codeDomBuilder.GenerateCode(output);
}
LogLine(2, "done");
}
resourcesToPrune.Add(resource);
}
if (!KeepXamlResources)
{
if (resourcesToPrune.Any())
LogLine(2, " Removing compiled xaml resources");
foreach (var resource in resourcesToPrune)
{
Log(2, " Removing {0}... ", resource.Name);
module.Resources.Remove(resource);
LogLine(2, "done");
}
}
LogLine(2, "");
}
if (!hasCompiledXamlResources)
{
LogLine(1, "No compiled resources. Skipping writing assembly.");
return success;
}
Log(1, "Writing the assembly... ");
try
{
assemblyDefinition.Write(Assembly, new WriterParameters
{
WriteSymbols = DebugSymbols
});
LogLine(1, "done.");
}
catch (Exception e)
{
LogLine(1, "failed.");
LogError(null, null, null, null, 0, 0, 0, 0, e.Message, e.HelpLink, e.Source);
LogLine(4, e.StackTrace);
success = false;
}
return success;
}
/// <summary>
/// Patches the (entry) method to output the used MonoMod version in the console.
/// </summary>
/// <returns>The new entry method.</returns>
/// <param name="entryOld">The old entry method.</param>
public virtual MethodDefinition PatchEntry(MethodDefinition entryOld)
{
if (entryOld == null) {
Log("Entry point not found; skipping...");
return null;
}
Log("M:"+entryOld.Name);
entryOld.Name = "orig_"+entryOld.Name;
MethodDefinition entry = new MethodDefinition("Main", MethodAttributes.Public | MethodAttributes.Static, Module.Import(typeof(void)));
entry.Parameters.Add(new ParameterDefinition(Module.Import(typeof(string[]))));
MethodBody body = new MethodBody(entry);
ILProcessor processor = body.GetILProcessor();
processor.Emit(OpCodes.Ldstr, "MonoMod "+System.Reflection.Assembly.GetExecutingAssembly().GetName().Version);
processor.Emit(OpCodes.Call, Module.Import(typeof(Console).GetMethod("WriteLine", new Type[] {typeof(string)})));
processor.Emit(OpCodes.Ldarg_0);
processor.Emit(OpCodes.Call, entryOld);
processor.Emit(OpCodes.Ret);
entry.Body = body;
entryOld.DeclaringType.Methods.Add(entry);
Module.EntryPoint = entry;
return entry;
}
/// <summary>
/// Processes and writes IL to the provided method body.
/// Note that this cleans the existing method body (removes insturctions and exception handlers).
/// </summary>
/// <param name="body">Method body to write to.</param>
/// <param name="original">Original method that transpiler can optionally call into</param>
/// <exception cref="NotSupportedException">
/// One of IL opcodes contains a CallSide (e.g. calli), which is currently not
/// fully supported.
/// </exception>
/// <exception cref="ArgumentNullException">One of IL opcodes with an operand contains a null operand.</exception>
public void WriteTo(MethodBody body, MethodBase original = null)
{
// Clean up the body of the target method
body.Instructions.Clear();
body.ExceptionHandlers.Clear();
var il = new CecilILGenerator(body.GetILProcessor());
var cil = il.GetProxy();
// Define an "empty" label
// In Harmony, the first label can point to the end of the method
// Apparently, some transpilers naively call new Label() to define a label and thus end up
// using the first label without knowing it
// By defining the first label we'll ensure label count is correct
il.DefineLabel();
// Step 1: Prepare labels for instructions
Prepare(vDef => il.GetLocal(vDef), il.DefineLabel);
// Step 2: Run the code instruction through transpilers
var newInstructions = ApplyTranspilers(cil, original);
// We don't remove trailing `ret`s because we need to do so only if prefixes/postfixes are present
// Step 3: Emit code
foreach (var ins in newInstructions)
{
ins.labels.ForEach(l => il.MarkLabel(l));
ins.blocks.ForEach(b => il.MarkBlockBefore(b));
// We don't replace `ret`s yet because we might not need to
// We do that only if we add prefixes/postfixes
// We also don't need to care for long/short forms thanks to Cecil/MonoMod
// Temporary fix: CecilILGenerator doesn't properly handle ldarg
switch (ins.opcode.OperandType)
{
case SRE.OperandType.InlineNone:
il.Emit(ins.opcode);
break;
case SRE.OperandType.InlineSig:
throw new NotSupportedException(
"Emitting opcodes with CallSites is currently not fully implemented");
default:
if (ins.operand == null)
{
throw new ArgumentNullException(nameof(ins.operand), $"Invalid argument for {ins}");
}
il.Emit(ins.opcode, ins.operand);
break;
}
ins.blocks.ForEach(b => il.MarkBlockAfter(b));
}
// Note: We lose all unassigned labels here along with any way to log them
// On the contrary, we gain better logging anyway down the line by using Cecil
// Step 4: Run the code through raw IL manipulators (if any)
// TODO: IL Manipulators
}
protected virtual void InjectAdditionalInstructionBeforeStartCall(Mono.Cecil.Cil.MethodBody body, Instruction call)
{
Instruction pickMyself = body.GetILProcessor().Create(OpCodes.Ldarg_0);
body.GetILProcessor().InsertBefore(call, pickMyself);
}
/// <summary>
/// Inserts the invalid il.
/// </summary>
/// <param name="methodBody">The method body.</param>
private static void InsertInvalidIl(MethodBody methodBody)
{
//Get the instructions and cil worker
var instructions = methodBody.Instructions;
if (instructions.Count <= 0)
return; //We can only do this if we have instructions to work with
ILProcessor il = methodBody.GetILProcessor();
//First create an invalid il instruction
OpCode fakeOpCode = CreateInvalidOpCode();
Instruction invalidIlInstr1 = il.Create(fakeOpCode);
Instruction invalidIlInstr2 = il.Create(fakeOpCode);
Instruction originalFirst = instructions[0];
//Insert invalid il at the start
il.InsertBefore(originalFirst, invalidIlInstr1);
il.InsertBefore(invalidIlInstr1, invalidIlInstr2);
//Create the branch statement
Instruction branchStatement = il.Create(OpCodes.Br_S, originalFirst);
//Add the branch to the start
il.InsertBefore(invalidIlInstr2, branchStatement);
//Readjust the offsets
il.AdjustOffsets(methodBody, 4);
}
public override bool Execute()
{
InMsBuild = true;
Verbosity = Int32.MaxValue;
LogLine(1, "Preparing debug code for xamlc");
LogLine(1, "\nAssembly: {0}", Assembly);
var resolver = new DefaultAssemblyResolver();
if (!string.IsNullOrEmpty(DependencyPaths))
{
foreach (var dep in DependencyPaths.Split(';'))
{
LogLine(3, "Adding searchpath {0}", dep);
resolver.AddSearchDirectory(dep);
}
}
if (!string.IsNullOrEmpty(ReferencePath))
{
var paths = ReferencePath.Replace("//", "/").Split(';');
foreach (var p in paths)
{
var searchpath = Path.GetDirectoryName(p);
LogLine(3, "Adding searchpath {0}", searchpath);
resolver.AddSearchDirectory(searchpath);
// LogLine (3, "Referencing {0}", p);
// resolver.AddAssembly (p);
}
}
var assemblyDefinition = AssemblyDefinition.ReadAssembly(Assembly, new ReaderParameters
{
//ReadSymbols = DebugSymbols,
AssemblyResolver = resolver
});
foreach (var module in assemblyDefinition.Modules)
{
LogLine(2, " Module: {0}", module.Name);
foreach (var resource in module.Resources.OfType<EmbeddedResource>())
{
Log(2, " Resource: {0}... ", resource.Name);
string classname;
if (!resource.IsXaml(out classname))
{
LogLine(2, "skipped.");
continue;
}
TypeDefinition typeDef = module.GetType(classname);
if (typeDef == null)
{
LogLine(2, "no type found... skipped.");
continue;
}
var initComp = typeDef.Methods.FirstOrDefault(md => md.Name == "InitializeComponent");
if (initComp == null)
{
LogLine(2, "no InitializeComponent found... skipped.");
continue;
}
if (typeDef.Methods.FirstOrDefault(md => md.Name == "InitCompRuntime") != null)
{
LogLine(2, "InitCompRuntime already exists... skipped");
continue;
}
LogLine(2, "");
Log(2, " Duplicating {0}.InitializeComponent () into {0}.InitCompRuntime ... ", typeDef.Name);
var initCompRuntime = new MethodDefinition("InitCompRuntime", initComp.Attributes, initComp.ReturnType);
initCompRuntime.Body = initComp.Body;
typeDef.Methods.Add(initCompRuntime);
LogLine(2, "done.");
// IL_0000: ldarg.0
// IL_0001: callvirt instance void class [Xamarin.Forms.Core]Xamarin.Forms.ContentPage::'.ctor'()
//
// IL_0006: nop
// IL_0007: ldarg.1
// IL_0008: brfalse IL_0018
//
// IL_000d: ldarg.0
// IL_000e: callvirt instance void class Xamarin.Forms.Xaml.XamlcTests.MyPage::InitializeComponent()
// IL_0013: br IL_001e
//
// IL_0018: ldarg.0
// IL_0019: callvirt instance void class Xamarin.Forms.Xaml.XamlcTests.MyPage::InitCompRuntime()
// IL_001e: ret
var altCtor =
typeDef.Methods.Where(
md => md.IsConstructor && md.Parameters.Count == 1 && md.Parameters[0].ParameterType == module.TypeSystem.Boolean)
.FirstOrDefault();
if (altCtor != null)
Log(2, " Replacing body of {0}.{0} (bool {1}) ... ", typeDef.Name, altCtor.Parameters[0].Name);
else
{
Log(2, " Adding {0}.{0} (bool useCompiledXaml) ... ", typeDef.Name);
altCtor = new MethodDefinition(".ctor",
MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.SpecialName |
MethodAttributes.RTSpecialName, module.TypeSystem.Void);
altCtor.Parameters.Add(new ParameterDefinition("useCompiledXaml", ParameterAttributes.None,
module.TypeSystem.Boolean));
}
var body = new MethodBody(altCtor);
var il = body.GetILProcessor();
var br2 = Instruction.Create(OpCodes.Ldarg_0);
var ret = Instruction.Create(OpCodes.Ret);
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Callvirt,
module.Import(typeDef.BaseType.Resolve().GetConstructors().First(c => c.HasParameters == false)));
il.Emit(OpCodes.Nop);
il.Emit(OpCodes.Ldarg_1);
il.Emit(OpCodes.Brfalse, br2);
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Callvirt, initComp);
il.Emit(OpCodes.Br, ret);
il.Append(br2);
il.Emit(OpCodes.Callvirt, initCompRuntime);
il.Append(ret);
altCtor.Body = body;
if (!typeDef.Methods.Contains(altCtor))
typeDef.Methods.Add(altCtor);
LogLine(2, "done.");
}
LogLine(2, "");
}
Log(1, "Writing the assembly... ");
assemblyDefinition.Write(Assembly, new WriterParameters
{
WriteSymbols = DebugSymbols
});
LogLine(1, "done.");
return true;
}
new void ProcessMethod(MethodDefinition method)
{
ProcessParameters (method);
if (!method.HasBody)
return;
var body = new MethodBody (method);
var il = body.GetILProcessor ();
il.Emit (OpCodes.Call, get_nse);
il.Emit (OpCodes.Throw);
method.Body = body;
}
/// <summary>
/// Callback when compliation finished
/// <paramref name="assemblyPath"/> Path compiled assembly
/// <paramref name="messages"/> Compliation messages
/// </summary>
public static void OnCompilationFinished(string assemblyPath, CompilerMessage[] messages)
{
if (assemblyPath.Contains("-Editor"))
{
return;
}
List <Type> derivedTypes = new List <Type>();
List <PropertyDefinition> properties = new List <PropertyDefinition>();
bool isModified = false;
#region Cecil
using (AssemblyDefinition currentAssembly = AssemblyDefinition.ReadAssembly(assemblyPath, new ReaderParameters {
ReadWrite = true, ReadSymbols = true /*, AssemblyResolver = asmResolver*/
}))
{
_mainModule = currentAssembly.MainModule;
var p = currentAssembly.MainModule.Types.Where(o => o.IsClass).SelectMany(t => t.Properties);
if (p != null)
{
properties.AddRange(p);
}
foreach (PropertyDefinition pd in properties)
{
CustomAttribute attr = pd.CustomAttributes.SingleOrDefault(i => i.AttributeType.Name == nameof(UIBindable));
if (attr != null)
{
Mono.Cecil.Cil.MethodBody body = pd.SetMethod.Body;
ILProcessor processor = body.GetILProcessor();
var instructions = body.Instructions;
var targetInst = instructions.Last();
#region Trying Generic
/*// importing the generic type
* var eq = _mainModule.ImportReference(typeof(UIBindProxy<>));
*
* // importing the type of T we want to instantiate the generic type
* var t = _mainModule.ImportReference(typeof(float));
* var genericEq = new GenericInstanceType(eq);
* genericEq.GenericArguments.Add(t);
* var importedGenericEq = _mainModule.ImportReference(genericEq);
* // getting the method we want to call on the generic instance
* var td = SafeResolve(importedGenericEq);
* td.DeclaringType = SafeResolve(t);
* var defaultMethodDef = td.Methods.Single(m => m.Name == "UpdateValue");
*
* var methodRef = _mainModule.ImportReference(defaultMethodDef);
*
* // Important - setting the method declaring type to the correct instantiated type
* methodRef.DeclaringType = importedGenericEq;
*
*
* processor.InsertBefore(targetInst, processor.Create(OpCodes.Nop));
* processor.InsertBefore(targetInst, processor.Create(OpCodes.Ldarg_0));
* processor.InsertBefore(targetInst, processor.Create(OpCodes.Ldstr, pd.Name));
* processor.InsertBefore(targetInst, processor.Create(OpCodes.Ldarg_1));
* processor.InsertBefore(targetInst, processor.Create(OpCodes.Call, methodRef));
* isModified = true;
* continue;
*
* var td2 = _mainModule.GetType("HDV.UIBindProxy`1");
* td2.DeclaringType = SafeResolve(_mainModule.ImportReference(typeof(float)));
*
* //td.DeclaringType
* // td = _mainModule.GetType("HDV.UIBindProxyTest");
* foreach (var md in td2.Methods)
* {
* if (md.Name == "UpdateValue")
* {
* processor.InsertBefore(targetInst, processor.Create(OpCodes.Nop));
* processor.InsertBefore(targetInst, processor.Create(OpCodes.Ldarg_0));
* processor.InsertBefore(targetInst, processor.Create(OpCodes.Ldstr, pd.Name));
* processor.InsertBefore(targetInst, processor.Create(OpCodes.Ldarg_1));
* processor.InsertBefore(targetInst, processor.Create(OpCodes.Call, md));
* isModified = true;
* }
* }
* continue;*/
#endregion
TypeDefinition td = _mainModule.GetType("HDV.UIBinding.UIBindProxy");
string methodName;
switch (pd.PropertyType.MetadataType)
{
case MetadataType.Single:
{
methodName = "UpdateFloatValue";
break;
}
case MetadataType.Int32:
{
methodName = "UpdateIntValue";
break;
}
//TODO: Need Generic
case MetadataType.String:
case MetadataType.Class:
case MetadataType.Object:
{
methodName = "UpdateObjectValue";
break;
}
default:
{
UnityDebug.LogError("Missing type " + pd.PropertyType.MetadataType);
continue;
}
}
MethodDefinition md = td.Methods.Single(m => m.Name == methodName);
processor.InsertBefore(targetInst, processor.Create(OpCodes.Nop));
processor.InsertBefore(targetInst, processor.Create(OpCodes.Ldarg_0));
processor.InsertBefore(targetInst, processor.Create(OpCodes.Ldstr, pd.Name));
processor.InsertBefore(targetInst, processor.Create(OpCodes.Ldarg_1));
processor.InsertBefore(targetInst, processor.Create(OpCodes.Call, md));
isModified = true;
}
}
if (isModified)
{
currentAssembly.Write(new WriterParameters {
WriteSymbols = true
});
}
}
#endregion
}
public static void Apply(ModuleDefinition module, Logger logger)
{
//AppDomain currentDomain = AppDomain.CurrentDomain;
//currentDomain.AssemblyResolve += new ResolveEventHandler(LoadFromSameFolder);
Assembly assembly = Assembly.LoadFrom(Deobfuscator.sourceAssemblyPath.path + Path.DirectorySeparatorChar + Deobfuscator.sourceAssemblyPath.filename);
Module target = assembly.GetModules()[0];
logger.KeyInfo("Looking for string decryption calls...");
int decryptStats = 0;
List <MethodDefinition> decryptMethods = new List <MethodDefinition>();
MethodDefinition[] mdefs = HelperClass.findMembers <MethodDefinition>(module, null, true);
for (int __i = 0; __i < mdefs.Length; __i++)
{
MethodDefinition mdef = mdefs[__i];
if (mdef.HasBody)
{
Mono.Cecil.Cil.MethodBody mdefBody = mdef.Body;
for (int i = 0; i < (mdefBody.Instructions.Count - 1); i++)
{
Instruction instr1 = mdefBody.Instructions[i];
Instruction instr2 = mdefBody.Instructions[i + 1];
if (loadIntegerCodes.ContainsKey(instr1.OpCode.Code) &&
(instr2.OpCode == OpCodes.Call))
{
int key = loadIntegerCodes[instr1.OpCode.Code](instr1.Operand); //(int)instr1.Operand;
MethodDefinition targetMethod = ((MethodReference)instr2.Operand).Resolve();
if (targetMethod != null && targetMethod.IsStatic &&
targetMethod.Parameters.Count == 1 && targetMethod.ReturnType.FullName.Equals("System.String") &&
targetMethod.HasBody && targetMethod.Body.Instructions.Count > 5 && targetMethod.Body.Instructions[4].OpCode == OpCodes.Ldelem_U1)
{
Type decryptorType = null;
MethodInfo decryptorMethod = null;
try
{
decryptorType = target.GetType(targetMethod.DeclaringType.FullName);
decryptorMethod = decryptorType.GetMethod(targetMethod.Name, BindingFlags.Static | BindingFlags.NonPublic);
string decrypted = (string)decryptorMethod.Invoke(null, new object[] { key });
Instruction newInstr;
ILProcessor proc = mdefBody.GetILProcessor();
HelperClass.SafeInsertBefore(proc, instr1, (newInstr = mdefBody.GetILProcessor().Create(OpCodes.Ldstr, decrypted)));
//mdefBody.GetILProcessor().InsertBefore(instr1, (newInstr = mdefBody.GetILProcessor().Create(OpCodes.Ldstr, decrypted)));
HelperClass.PatchInstructionReferences(mdefBody, instr1, newInstr);
for (int _i = 0; _i < 2; _i++)
{
HelperClass.SafeRemove(proc, mdefBody.Instructions[i + 1]);
}
//mdefBody.Instructions.RemoveAt(i+1);
if (!decryptMethods.Contains(targetMethod))
{
decryptMethods.Add(targetMethod);
}
//logger.Info(decrypted);
//i++;
decryptStats++;
}
catch (Exception e)
{
logger.Warning("Unable to decrypt " + targetMethod.Name + " (" + key + ") :\r\n" + e.ToString());
continue;
}
}
}
}
}
if ((__i % (mdefs.Length / 10)) == 0 && __i > 0)
{
logger.KeyInfo("Decrypted strings from method #" + (__i + 1) + ".");
}
}
for (int i = 0; i < decryptMethods.Count; i++)
{
MethodDefinition mdef = decryptMethods[i];
//module.Types.Remove(mdef.DeclaringType);
mdef.DeclaringType.Name = "decryptor" + i;
mdef.Name = "Decrypt";
}
logger.KeyInfo("Finished decrypting " + decryptStats + " strings!");
}
private void RewriteIL (MethodBody body, Dictionary<Expr,Instruction> instructionLookup, Expr remove, Expr insert)
{
var il = body.GetILProcessor ();
Instruction instInsertBefore;
if (remove != null) {
var vInstExtent = new InstructionExtentVisitor (instructionLookup);
vInstExtent.Visit (remove);
instInsertBefore = vInstExtent.Instructions.Last ().Next;
foreach (var instRemove in vInstExtent.Instructions) {
il.Remove (instRemove);
}
} else {
instInsertBefore = body.Instructions [0];
}
if (insert != null) {
var compiler = new CompileVisitor (il, instructionLookup, inst => il.InsertBefore (instInsertBefore, inst));
compiler.Visit (insert);
}
}
private static MethodBody CloneMethodBody(MethodBody body, MethodDefinition source, MethodDefinition target)
{
var context = target.DeclaringType.Module;
var nb = new MethodBody(target)
{
MaxStackSize = body.MaxStackSize,
InitLocals = body.InitLocals,
CodeSize = body.CodeSize
};
var worker = nb.GetILProcessor();
foreach (var var in body.Variables)
nb.Variables.Add(new VariableDefinition(
var.Name, FixTypeImport(context, source, target, var.VariableType)));
foreach (var instr in body.Instructions)
{
var ni = new Instruction(instr.OpCode, OpCodes.Nop);
switch (instr.OpCode.OperandType)
{
case OperandType.InlineArg:
case OperandType.ShortInlineArg:
if (instr.Operand == body.ThisParameter)
ni.Operand = nb.ThisParameter;
else
{
var param = body.Method.Parameters.IndexOf((ParameterDefinition)instr.Operand);
ni.Operand = target.Parameters[param];
}
break;
case OperandType.InlineVar:
case OperandType.ShortInlineVar:
var var = body.Variables.IndexOf((VariableDefinition)instr.Operand);
ni.Operand = nb.Variables[var];
break;
case OperandType.InlineField:
ni.Operand = FixFieldImport(context, source, target, (FieldReference)instr.Operand);
break;
case OperandType.InlineMethod:
ni.Operand = FixMethodImport(context, source, target, (MethodReference)instr.Operand);
break;
case OperandType.InlineType:
ni.Operand = FixTypeImport(context, source, target, (TypeReference)instr.Operand);
break;
case OperandType.InlineTok:
if ((instr.Operand) is TypeReference)
ni.Operand = FixTypeImport(context, source, target, (TypeReference)instr.Operand);
else if ((instr.Operand) is FieldReference)
ni.Operand = FixFieldImport(context, source, target, (FieldReference)instr.Operand);
else if ((instr.Operand) is MethodReference)
ni.Operand = FixMethodImport(context, source, target, (MethodReference)instr.Operand);
break;
case OperandType.ShortInlineBrTarget:
case OperandType.InlineBrTarget:
case OperandType.InlineSwitch:
break;
default:
ni.Operand = instr.Operand;
break;
}
worker.Append(ni);
}
for (var i = 0; i < body.Instructions.Count; i++)
{
var instr = nb.Instructions[i];
var oldi = body.Instructions[i];
switch (instr.OpCode.OperandType)
{
case OperandType.InlineSwitch:
{
var olds = (Instruction[])oldi.Operand;
var targets = new Instruction[olds.Length];
for (var j = 0; j < targets.Length; j++)
targets[j] = GetInstruction(body, nb, olds[j]);
instr.Operand = targets;
}
break;
case OperandType.InlineBrTarget:
case OperandType.ShortInlineBrTarget:
instr.Operand = GetInstruction(body, nb, (Instruction)oldi.Operand);
break;
}
}
foreach (var eh in body.ExceptionHandlers)
{
var neh = new ExceptionHandler(eh.HandlerType)
{
TryStart = GetInstruction(body, nb, eh.TryStart),
TryEnd = GetInstruction(body, nb, eh.TryEnd),
HandlerStart = GetInstruction(body, nb, eh.HandlerStart),
HandlerEnd = GetInstruction(body, nb, eh.HandlerEnd)
};
switch (eh.HandlerType)
{
case ExceptionHandlerType.Catch:
neh.CatchType = FixTypeImport(context, source, target, eh.CatchType);
break;
case ExceptionHandlerType.Filter:
neh.FilterStart = GetInstruction(body, nb, eh.FilterStart);
break;
}
nb.ExceptionHandlers.Add(neh);
}
return nb;
}
/// <summary>
/// Generates the xor decryption method.
/// </summary>
/// <param name="assembly">The assembly.</param>
/// <param name="body">The body.</param>
private static void GenerateXorDecryptionMethod(AssemblyDefinition assembly, MethodBody body)
{
var worker = body.GetILProcessor();
//Generate the decryption method
//Since this is XOR it is the same as the encryption method
//In reality its a bit of a joke calling this encryption as its really
//just obfusaction
/*
char[] characters = value.ToCharArray();
for (int i = 0; i < characters.Length; i++)
{
characters[i] = (char)(characters[i] ^ salt);
}
return new String(characters);
*/
//Declare a local to store the char array
body.InitLocals = true;
body.Method.AddLocal(typeof(char[]));
body.Method.AddLocal(typeof(int));
body.Method.AddLocal(typeof(string));
body.Method.AddLocal(typeof(bool));
//Start with a nop
worker.Append(worker.Create(OpCodes.Nop));
//Load the first argument into the register
Instruction ldArg0 = worker.Create(OpCodes.Ldarg_0);
worker.Append(ldArg0);
//Call ToCharArray on this -- need to find it first
var toCharArrayMethodRef = assembly.Import(typeof(string).GetMethod("ToCharArray", Type.EmptyTypes));
//Import the method first
toCharArrayMethodRef = body.ImportMethod(toCharArrayMethodRef);
Instruction toCharArray = worker.Create(OpCodes.Callvirt, toCharArrayMethodRef);
worker.Append(toCharArray);
//Store it in the first local
Instruction stLoc0 = worker.Create(OpCodes.Stloc_0);
worker.Append(stLoc0);
//Set up the loop
worker.Append(worker.Create(OpCodes.Ldc_I4_0));
Instruction stLoc1 = worker.Create(OpCodes.Stloc_1);
worker.Append(stLoc1);
//We'll insert a br.s here later....
//Insert another nop and do the rest of our loop
Instruction loopNop = worker.Create(OpCodes.Nop);
worker.Append(loopNop);
worker.Append(worker.Create(OpCodes.Ldloc_0));
worker.Append(worker.Create(OpCodes.Ldloc_1));
worker.Append(worker.Create(OpCodes.Ldloc_0));
worker.Append(worker.Create(OpCodes.Ldloc_1));
worker.Append(worker.Create(OpCodes.Ldelem_U2)); //Load the array
worker.Append(worker.Create(OpCodes.Ldarg_1));
worker.Append(worker.Create(OpCodes.Xor)); //Do the xor
worker.Append(worker.Create(OpCodes.Conv_U2));
worker.Append(worker.Create(OpCodes.Stelem_I2)); //Store back in the array
worker.Append(worker.Create(OpCodes.Nop));
worker.Append(worker.Create(OpCodes.Ldloc_1));
worker.Append(worker.Create(OpCodes.Ldc_I4_1));
worker.Append(worker.Create(OpCodes.Add));
worker.Append(worker.Create(OpCodes.Stloc_1));
Instruction ldLoc = worker.Create(OpCodes.Ldloc_1);
worker.Append(ldLoc);
//Link to this line from an earlier statement
worker.InsertAfter(stLoc1, worker.Create(OpCodes.Br_S, ldLoc));
worker.Append(worker.Create(OpCodes.Ldloc_0));
worker.Append(worker.Create(OpCodes.Ldlen));
worker.Append(worker.Create(OpCodes.Conv_I4));
worker.Append(worker.Create(OpCodes.Clt)); //i < array.Length
worker.Append(worker.Create(OpCodes.Stloc_3));
worker.Append(worker.Create(OpCodes.Ldloc_3));
worker.Append(worker.Create(OpCodes.Brtrue_S, loopNop)); //Do the loop
//Return a new string
worker.Append(worker.Create(OpCodes.Ldloc_0));
//Find the constructor we want to use
MethodReference constructor = assembly.Import(typeof(string).GetConstructor(new [] { typeof(char[])}));
constructor = body.ImportMethod(constructor);
worker.Append(worker.Create(OpCodes.Newobj, constructor));
Instruction stloc2 = worker.Create(OpCodes.Stloc_2);
worker.Append(stloc2);
Instruction ldloc2 = worker.Create(OpCodes.Ldloc_2);
worker.Append(ldloc2);
worker.InsertAfter(stloc2, worker.Create(OpCodes.Br_S, ldloc2));
worker.Append(worker.Create(OpCodes.Ret));
}
public void UnattachedMethodBody()
{
var system_void = typeof (void).ToDefinition ();
var method = new MethodDefinition ("NewMethod", MethodAttributes.Assembly | MethodAttributes.Static, system_void);
var body = new MethodBody (method);
var il = body.GetILProcessor ();
il.Emit (OpCodes.Ret);
method.Body = body;
Assert.AreEqual (body, method.Body);
}
private void WeaveDependencyProperty(MethodBody staticCtorBody, FieldReference field, PropertyDefinition property)
{
var assembly = property.DeclaringType.Module.Assembly;
var propertyType = assembly.ImportType(Type.GetType(property.PropertyType.FullName));
var getTypeFromHandle = assembly.ImportMethod(typeof(Type).GetMethod("GetTypeFromHandle"));
var register = assembly.ImportMethod(typeof(DependencyProperty).GetMethod("Register", new[] { typeof(string), typeof(Type), typeof(Type) }));
// ignore previously weaved DPs
if (staticCtorBody.Instructions.Any(i => i.Operand != null && i.Operand.ToString() == field.ToString()))
{
return;
}
var ret = staticCtorBody.Instructions.Last();
if (ret.OpCode != OpCodes.Ret)
throw new InvalidOperationException("The last instruction should be OpCode.Ret");
HasChanges = true;
var proc = staticCtorBody.GetILProcessor();
proc.InsertBefore(ret, proc.Create(OpCodes.Ldstr, property.Name));
proc.InsertBefore(ret, proc.Create(OpCodes.Ldtoken, propertyType));
proc.InsertBefore(ret, proc.Create(OpCodes.Call, getTypeFromHandle));
proc.InsertBefore(ret, proc.Create(OpCodes.Ldtoken, property.DeclaringType));
proc.InsertBefore(ret, proc.Create(OpCodes.Call, getTypeFromHandle));
proc.InsertBefore(ret, proc.Create(OpCodes.Call, register));
proc.InsertBefore(ret, proc.Create(OpCodes.Stsfld, field));
}
public IlBuilder(MethodBody body)
{
_body = body;
this._il = body.GetILProcessor();
_list = new List <Instruction>();
}
//TODO: move this out of here
public virtual Instruction Create(MethodBody methodBody, ModuleDefinition moduleDefinition)
{
object operand = 0;
Instruction instruction = null;
var processor = methodBody.GetILProcessor();
switch (OpCode.OperandType)
{
case OperandType.ShortInlineR:
{
float parsedOpcode = 0.0f;
if (_operandSrc != null)
{
if (_operandSrc is string)
{
float.TryParse((string)_operandSrc, out parsedOpcode);
}
else if (_operandSrc is float)
{
parsedOpcode =(float)_operandSrc;
}
}
instruction = processor.Create(OpCode, parsedOpcode);
break;
}
case OperandType.ShortInlineVar:
case OperandType.InlineVar:
{
VariableDefinition variable = null;
if (_operandSrc != null)
{
if (_operandSrc is string)
{
int tempN = 0;
if (int.TryParse((string) _operandSrc, out tempN)) //deserialised ints come in as strings
{
variable = methodBody.Variables[tempN];
}
else
{
variable = methodBody.Variables.First(v => v.Name == (string) _operandSrc);
}
}
else if (_operandSrc is int || _operandSrc is short)
{
variable = methodBody.Variables[(int) _operandSrc];
}
}
instruction = processor.Create(OpCode, variable);
break;
}
case OperandType.InlineMethod:
{
MethodReference method = CodeHelper.ResolveMethod(moduleDefinition, _operandSrc.ToString());
if (method == null)
{
Debug.WriteLine("Method {0} can't be resolved yet. Postponing.", _operandSrc.ToString());
instruction = processor.CreateUnsafe(OpCode, _operandSrc);
instruction.ResolveOperand = (ins) => CodeHelper.ResolveMethod(moduleDefinition, _operandSrc.ToString());
}
else
{
instruction = processor.Create(OpCode, method);
}
}
break;
case OperandType.InlineString:
instruction = processor.Create(OpCode, _operandSrc.ToString());
break;
case OperandType.InlineBrTarget:
case OperandType.ShortInlineBrTarget:
if (_operandSrc == null)
{
throw new ApplicationException("invalid codeline");
}
instruction = processor.CreateUnsafe(OpCode, _operandSrc);
instruction.ResolveOperand = (ins) =>
{
//Debug.Assert(_operandSrc != "GOTO_ENDHW");
var resolved = processor.Body.Instructions.FirstOrDefault(i => !string.IsNullOrEmpty(i.Label) && i.Label == (string) _operandSrc);
if (resolved == null)
{
throw new ApplicationException("Unresolved break target");
}
return resolved;
};
break;
case OperandType.InlineNone:
instruction = processor.Create(OpCode);
break;
case OperandType.InlineField:
{
var names = _operandSrc.ToString().Split(new[] {" ", "::"}, 3, StringSplitOptions.RemoveEmptyEntries);
TypeReference foundType = CodeHelper.ResolveType(moduleDefinition, names[1]);
var typeDef = (TypeDefinition) (foundType is TypeDefinition ? foundType : foundType.Resolve());
FieldReference fieldReference = typeDef.Fields.FirstOrDefault(f => f.FullName == _operandSrc.ToString());
var importedRef = moduleDefinition.Import(fieldReference);
if (fieldReference == null)
{
throw new ApplicationException(String.Format("Field {0} not found", _operandSrc));
}
instruction = processor.Create(OpCode, importedRef);
}
break;
default:
instruction = processor.CreateUnsafe(OpCode, _operandSrc);
break;
}
instruction.Label = Label;
return instruction;
}
public static MethodDefinition Inject(ModuleDefinition mod, MethodDefinition mtd)
{
MethodDefinition ret = new MethodDefinition(mtd.Name, mtd.Attributes, mod.TypeSystem.Void);
ret.Attributes = mtd.Attributes;
ret.ImplAttributes = mtd.ImplAttributes;
if (mtd.IsPInvokeImpl)
{
ret.PInvokeInfo = mtd.PInvokeInfo;
bool has = false;
foreach (ModuleReference modRef in mod.ModuleReferences)
if (modRef.Name == ret.PInvokeInfo.Module.Name)
{
has = true;
ret.PInvokeInfo.Module = modRef;
break;
}
if (!has)
mod.ModuleReferences.Add(ret.PInvokeInfo.Module);
}
if (mtd.HasCustomAttributes)
{
foreach (CustomAttribute attr in mtd.CustomAttributes)
{
CustomAttribute nAttr = new CustomAttribute(ImportMethod(attr.Constructor, mod, ret, null), attr.GetBlob());
ret.CustomAttributes.Add(nAttr);
}
}
foreach (GenericParameter param in mtd.GenericParameters)
{
var p = new GenericParameter(param.Name, ret);
if (param.HasCustomAttributes)
{
foreach (CustomAttribute attr in param.CustomAttributes)
{
CustomAttribute nAttr = new CustomAttribute(ImportMethod(attr.Constructor, mod, ret, null), attr.GetBlob());
p.CustomAttributes.Add(nAttr);
}
}
ret.GenericParameters.Add(p);
}
ret.ReturnType = ImportType(mtd.ReturnType, mod, ret, null);
foreach (ParameterDefinition param in mtd.Parameters)
{
var p = new ParameterDefinition(param.Name, param.Attributes, ImportType(param.ParameterType, mod, ret, null));
if (param.HasCustomAttributes)
{
foreach (CustomAttribute attr in param.CustomAttributes)
{
CustomAttribute nAttr = new CustomAttribute(ImportMethod(attr.Constructor, mod, ret, null), attr.GetBlob());
p.CustomAttributes.Add(nAttr);
}
}
ret.Parameters.Add(p);
}
if (mtd.HasBody)
{
MethodBody old = mtd.Body;
MethodBody bdy = new MethodBody(ret);
bdy.MaxStackSize = old.MaxStackSize;
bdy.InitLocals = old.InitLocals;
ILProcessor psr = bdy.GetILProcessor();
foreach (VariableDefinition var in old.Variables)
bdy.Variables.Add(new VariableDefinition(var.Name, ImportType(var.VariableType, mod, ret, null)));
foreach (Instruction inst in old.Instructions)
{
switch (inst.OpCode.OperandType)
{
case OperandType.InlineArg:
case OperandType.ShortInlineArg:
if (inst.Operand == old.ThisParameter)
psr.Emit(inst.OpCode, bdy.ThisParameter);
else
{
int param = mtd.Parameters.IndexOf(inst.Operand as ParameterDefinition);
psr.Emit(inst.OpCode, ret.Parameters[param]);
}
break;
case OperandType.InlineVar:
case OperandType.ShortInlineVar:
int var = old.Variables.IndexOf(inst.Operand as VariableDefinition);
psr.Emit(inst.OpCode, bdy.Variables[var]);
break;
case OperandType.InlineField:
psr.Emit(inst.OpCode, ImportField(inst.Operand as FieldReference, mod, null));
break;
case OperandType.InlineMethod:
if (inst.Operand == mtd)
psr.Emit(inst.OpCode, ret);
else
psr.Emit(inst.OpCode, ImportMethod(inst.Operand as MethodReference, mod, ret, null));
break;
case OperandType.InlineType:
psr.Emit(inst.OpCode, ImportType(inst.Operand as TypeReference, mod, ret, null));
break;
case OperandType.InlineTok:
if (inst.Operand is TypeReference)
psr.Emit(inst.OpCode, ImportType(inst.Operand as TypeReference, mod, ret, null));
else if (inst.Operand is FieldReference)
psr.Emit(inst.OpCode, ImportField(inst.Operand as FieldReference, mod, null));
else if (inst.Operand is MethodReference)
psr.Emit(inst.OpCode, ImportMethod(inst.Operand as MethodReference, mod, ret, null));
break;
default:
psr.Append(inst.Clone());
break;
}
}
for (int i = 0; i < bdy.Instructions.Count; i++)
{
Instruction inst = bdy.Instructions[i];
Instruction o = old.Instructions[i];
if (inst.OpCode.OperandType == OperandType.InlineSwitch)
{
Instruction[] olds = (Instruction[])o.Operand;
Instruction[] news = new Instruction[olds.Length];
for (int ii = 0; ii < news.Length; ii++)
news[ii] = bdy.Instructions[old.Instructions.IndexOf(olds[ii])];
inst.Operand = news;
}
else if (inst.OpCode.OperandType == OperandType.ShortInlineBrTarget || inst.OpCode.OperandType == OperandType.InlineBrTarget)
inst.Operand = bdy.Instructions[old.Instructions.IndexOf(inst.Operand as Instruction)];
}
foreach (ExceptionHandler eh in old.ExceptionHandlers)
{
ExceptionHandler neh = new ExceptionHandler(eh.HandlerType);
if (old.Instructions.IndexOf(eh.TryStart) != -1)
neh.TryStart = bdy.Instructions[old.Instructions.IndexOf(eh.TryStart)];
if (old.Instructions.IndexOf(eh.TryEnd) != -1)
neh.TryEnd = bdy.Instructions[old.Instructions.IndexOf(eh.TryEnd)];
if (old.Instructions.IndexOf(eh.HandlerStart) != -1)
neh.HandlerStart = bdy.Instructions[old.Instructions.IndexOf(eh.HandlerStart)];
if (old.Instructions.IndexOf(eh.HandlerEnd) != -1)
neh.HandlerEnd = bdy.Instructions[old.Instructions.IndexOf(eh.HandlerEnd)];
switch (eh.HandlerType)
{
case ExceptionHandlerType.Catch:
neh.CatchType = ImportType(eh.CatchType, mod, ret, null);
break;
case ExceptionHandlerType.Filter:
neh.FilterStart = bdy.Instructions[old.Instructions.IndexOf(eh.FilterStart)];
//neh.FilterEnd = bdy.Instructions[old.Instructions.IndexOf(eh.FilterEnd)];
break;
}
bdy.ExceptionHandlers.Add(neh);
}
ret.Body = bdy;
}
return ret;
}
//protected override void InjectAdditionalInstructionBeforeStartCall(Mono.Cecil.Cil.MethodBody body, Mono.Cecil.Cil.Instruction call)
//{
// Instruction pickMyself = body.GetILProcessor().Create(OpCodes.Ldarg_0);
// body.GetILProcessor().InsertBefore(call, pickMyself);
//}
protected override void InjectAdditionalInstructionAfterStartCall(Mono.Cecil.Cil.MethodBody body, Mono.Cecil.Cil.Instruction call)
{
var ret = body.GetILProcessor().Create(OpCodes.Ret);
body.GetILProcessor().InsertAfter(call, ret);
}
public override void ProcessType(TypeDefinition type)
{
if (!type.Is ("ObjCRuntime", "RuntimeOptions"))
return;
MethodDefinition method = type.Methods.First (x => x.Name == "GetHttpMessageHandler" && !x.HasParameters);
AssemblyDefinition systemNetHTTPAssembly = context.GetAssemblies ().First (x => x.Name.Name == "System.Net.Http");
TypeDefinition handler = RuntimeOptions.GetHttpMessageHandler (Options.RuntimeOptions, systemNetHTTPAssembly.MainModule, type.Module);
MethodReference handler_ctor = handler.Methods.First (x => x.IsConstructor && !x.HasParameters && !x.IsStatic);
// HttpClientHandler is defined not in Xamarin.Mac.dll so we need to import
if (handler.Name.Contains ("HttpClientHandler"))
handler_ctor = type.Module.Import (handler_ctor);
var body = new MethodBody (method);
var il = body.GetILProcessor ();
il.Emit (OpCodes.Newobj, handler_ctor);
il.Emit (OpCodes.Ret);
method.Body = body;
}
private static void FoldAndReplace(
ref Dictionary<KeyValuePair<int, int>, ExInstruction> markings,
ref MethodBody body)
{
var instrList = body.Instructions;
var foldedBody = new Collection<Instruction>();
foreach(var marking in markings)
{
for(var i = 0;i < instrList.Count;i++)
{
if(marking.Key.Key == i)
{
for (var x = 0; x < marking.Key.Value +1; x++)
instrList.RemoveAt(marking.Key.Key -2);
switch(marking.Value.OpCode.Code)
{
case Code.Ldc_I4:
instrList.Insert(marking.Key.Key -3,
body.GetILProcessor().Create(OpCodes.Ldc_I4, (int)marking.Value.Value));
break;
case Code.Ldc_I8:
instrList.Insert(marking.Key.Key -3,
body.GetILProcessor().Create(OpCodes.Ldc_I8, (long)marking.Value.Value));
break;
}
break;
}
}
}
body.Instructions.Clear();
//body.SimplifyMacros();
var ilProc = body.GetILProcessor();
foreach (var instr in instrList)
ilProc.Append(instr);
//body.OptimizeMacros();//it can't resolve the tokens from rocks
}
public override void ProcessType(TypeDefinition type)
{
#if XAMARIN_NO_TLS
return;
#else
if (!type.Is (Namespaces.ObjCRuntime, "Runtime"))
return;
MethodDefinition callbackMethod = null;
foreach (var m in type.Methods) {
if (!m.IsStatic || m.HasParameters)
continue;
if (m.Name.Equals ("TlsProviderFactoryCallback", StringComparison.Ordinal)) {
callbackMethod = m;
break;
}
}
if (callbackMethod == null)
throw new Exception ("Could not set the default TlsProvider");
var providerCtor = FindProviderConstructor (type.Module);
if (providerCtor == null)
return;
// re-write TlsProviderFactoryCallback()
var body = new MethodBody (callbackMethod);
var il = body.GetILProcessor ();
if (providerCtor != null)
il.Emit (OpCodes.Newobj, providerCtor);
else
il.Emit (OpCodes.Ldnull);
il.Emit (OpCodes.Ret);
callbackMethod.Body = body;
#endif
}
public void PatchModifications()
{
foreach (XElement classNode in mModifications.Elements("Class"))
{
// We load the class in which the modifications will take place
string nameTypeToPatch = classNode.Attribute("Name").Value;
TypeDefinition typeToPatch = GetAssembly("Assembly-CSharp").MainModule.Types.FirstOrDefault(t => t.Name == nameTypeToPatch);
if (typeToPatch == null)
{
MessageBox.Show("Couldn't find type/class named" + nameTypeToPatch, "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error);
continue;
}
foreach (XElement methodNode in classNode.Elements("Method"))
{
string nameMethodTopatch = methodNode.Attribute("Name").Value;
MethodDefinition methodToPatch = typeToPatch.Methods.FirstOrDefault(m => m.Name == nameMethodTopatch);
if (methodToPatch == null)
{
MessageBox.Show("Couldn't find method named" + nameMethodTopatch, "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error);
continue;
}
Mono.Cecil.Cil.MethodBody methodBody = methodToPatch.Body;
ILProcessor processor = methodBody.GetILProcessor();
// By default, we place the modification just before the "ret" instruction
// (i.e. before the last instruction)
int indexBegin = methodToPatch.Body.Instructions.Count - 1;
// But, if the user specified a location, we place the modification there
if (methodNode.Attribute("Location") != null)
{
indexBegin = int.Parse(methodNode.Attribute("Location").Value);
}
// If the user specified a count of instructions to delete,
// we delete them
if (methodNode.Attribute("DeleteCount") != null)
{
int countInstrToDelete = int.Parse(methodNode.Attribute("DeleteCount").Value);
for (int i = 0; i < countInstrToDelete; i++)
{
processor.Remove(methodToPatch.Body.Instructions.ElementAt(indexBegin));
}
}
Instruction locationInstr = methodToPatch.Body.Instructions.ElementAt(indexBegin);
Instruction prevInstr = locationInstr.Previous;
foreach (XElement instrNode in methodNode.Elements("Instruction"))
{
Instruction instr = Call.ParseInstruction(processor, typeToPatch, instrNode);
//MessageBox.Show(instr.ToString());
if (instr == null)
{
continue;
}
if (prevInstr == null)
{
processor.InsertBefore(locationInstr, instr);
}
else
{
processor.InsertAfter(prevInstr, instr);
}
prevInstr = instr;
}
// Optimize the method
methodToPatch.Body.OptimizeMacros();
}
}
}
private void _CopyMethodToDefinition()
{
MethodBase method = OriginalMethod;
Module moduleFrom = method.Module;
System.Reflection.MethodBody bodyFrom = method.GetMethodBody();
byte[] data = bodyFrom?.GetILAsByteArray();
if (data == null)
{
throw new NotSupportedException("Body-less method");
}
MethodDefinition def = Definition;
ModuleDefinition moduleTo = def.Module;
Mono.Cecil.Cil.MethodBody bodyTo = def.Body;
ILProcessor processor = bodyTo.GetILProcessor();
Type[] typeArguments = null;
if (method.DeclaringType.IsGenericType)
{
typeArguments = method.DeclaringType.GetGenericArguments();
}
Type[] methodArguments = null;
if (method.IsGenericMethod)
{
methodArguments = method.GetGenericArguments();
}
foreach (LocalVariableInfo info in bodyFrom.LocalVariables)
{
TypeReference type = moduleTo.ImportReference(info.LocalType);
if (info.IsPinned)
{
type = new PinnedType(type);
}
bodyTo.Variables.Add(new VariableDefinition(type));
}
using (BinaryReader reader = new BinaryReader(new MemoryStream(data))) {
for (Instruction instr = null, prev = null; reader.BaseStream.Position < reader.BaseStream.Length; prev = instr)
{
int offset = (int)reader.BaseStream.Position;
instr = Instruction.Create(OpCodes.Nop);
byte op = reader.ReadByte();
instr.OpCode = op != 0xfe ? _CecilOpCodes1X[op] : _CecilOpCodes2X[reader.ReadByte()];
instr.Offset = offset;
if (prev != null)
{
prev.Next = instr;
}
instr.Previous = prev;
ReadOperand(reader, instr);
bodyTo.Instructions.Add(instr);
}
}
foreach (Instruction instr in bodyTo.Instructions)
{
switch (instr.OpCode.OperandType)
{
case OperandType.ShortInlineBrTarget:
case OperandType.InlineBrTarget:
instr.Operand = GetInstruction((int)instr.Operand);
break;
case OperandType.InlineSwitch:
int[] offsets = (int[])instr.Operand;
Instruction[] targets = new Instruction[offsets.Length];
for (int i = 0; i < offsets.Length; i++)
{
targets[i] = GetInstruction(offsets[i]);
}
instr.Operand = targets;
break;
}
}
foreach (ExceptionHandlingClause clause in bodyFrom.ExceptionHandlingClauses)
{
ExceptionHandler handler = new ExceptionHandler((ExceptionHandlerType)clause.Flags);
bodyTo.ExceptionHandlers.Add(handler);
handler.TryStart = GetInstruction(clause.TryOffset);
handler.TryEnd = GetInstruction(clause.TryOffset + clause.TryLength);
handler.FilterStart = handler.HandlerType != ExceptionHandlerType.Filter ? null : GetInstruction(clause.FilterOffset);
handler.HandlerStart = GetInstruction(clause.HandlerOffset);
handler.HandlerEnd = GetInstruction(clause.HandlerOffset + clause.HandlerLength);
handler.CatchType = handler.HandlerType != ExceptionHandlerType.Catch ? null : clause.CatchType == null ? null : moduleTo.ImportReference(clause.CatchType);
}
void ReadOperand(BinaryReader reader, Instruction instr)
{
int index, offs, length;
switch (instr.OpCode.OperandType)
{
case OperandType.InlineNone:
instr.Operand = null;
break;
case OperandType.InlineSwitch:
length = reader.ReadInt32();
offs = (int)reader.BaseStream.Position + (4 * length);
int[] targets = new int[length];
for (int i = 0; i < length; i++)
{
targets[i] = reader.ReadInt32() + offs;
}
instr.Operand = targets;
break;
case OperandType.ShortInlineBrTarget:
offs = reader.ReadSByte();
instr.Operand = (int)reader.BaseStream.Position + offs;
break;
case OperandType.InlineBrTarget:
offs = reader.ReadInt32();
instr.Operand = (int)reader.BaseStream.Position + offs;
break;
case OperandType.ShortInlineI:
instr.Operand = instr.OpCode == OpCodes.Ldc_I4_S ? reader.ReadSByte() : (object)reader.ReadByte();
break;
case OperandType.InlineI:
instr.Operand = reader.ReadInt32();
break;
case OperandType.ShortInlineR:
instr.Operand = reader.ReadSingle();
break;
case OperandType.InlineR:
instr.Operand = reader.ReadDouble();
break;
case OperandType.InlineI8:
instr.Operand = reader.ReadInt64();
break;
case OperandType.InlineSig:
instr.Operand = moduleTo.ImportCallSite(moduleFrom, moduleFrom.ResolveSignature(reader.ReadInt32()));
break;
case OperandType.InlineString:
instr.Operand = moduleFrom.ResolveString(reader.ReadInt32());
break;
case OperandType.InlineTok:
instr.Operand = ResolveTokenAs(reader.ReadInt32(), TokenResolutionMode.Any);
break;
case OperandType.InlineType:
instr.Operand = ResolveTokenAs(reader.ReadInt32(), TokenResolutionMode.Type);
break;
case OperandType.InlineMethod:
instr.Operand = ResolveTokenAs(reader.ReadInt32(), TokenResolutionMode.Method);
break;
case OperandType.InlineField:
instr.Operand = ResolveTokenAs(reader.ReadInt32(), TokenResolutionMode.Field);
break;
case OperandType.ShortInlineVar:
case OperandType.InlineVar:
index = instr.OpCode.OperandType == OperandType.ShortInlineVar ? reader.ReadByte() : reader.ReadInt16();
instr.Operand = bodyTo.Variables[index];
break;
case OperandType.InlineArg:
case OperandType.ShortInlineArg:
index = instr.OpCode.OperandType == OperandType.ShortInlineArg ? reader.ReadByte() : reader.ReadInt16();
instr.Operand = def.Parameters[index];
break;
case OperandType.InlinePhi: // No opcode seems to use this
default:
throw new NotSupportedException($"Unsupported opcode ${instr.OpCode.Name}");
}
}
MemberReference ResolveTokenAs(int token, TokenResolutionMode resolveMode)
{
try {
switch (resolveMode)
{
case TokenResolutionMode.Type:
return(moduleTo.ImportReference(moduleFrom.ResolveType(token, typeArguments, methodArguments)));
case TokenResolutionMode.Method:
return(moduleTo.ImportReference(moduleFrom.ResolveMethod(token, typeArguments, methodArguments)));
case TokenResolutionMode.Field:
return(moduleTo.ImportReference(moduleFrom.ResolveField(token, typeArguments, methodArguments)));
case TokenResolutionMode.Any:
switch (moduleFrom.ResolveMember(token, typeArguments, methodArguments))
{
case Type i:
return(moduleTo.ImportReference(i));
case MethodBase i:
return(moduleTo.ImportReference(i));
case FieldInfo i:
return(moduleTo.ImportReference(i));
case var resolved:
throw new NotSupportedException($"Invalid resolved member type {resolved.GetType()}");
}
default:
throw new NotSupportedException($"Invalid TokenResolutionMode {resolveMode}");
}
} catch (MissingMemberException) {
// we could not resolve the method normally, so lets read the import table
// but we can only do that if the module was loaded from disk
// this can still throw if the assembly is a dynamic one, but if that's broken, you have bigger issues
string filePath = moduleFrom.Assembly.Location;
if (!File.Exists(filePath))
{
// in this case, the fallback cannot be followed, and so throwing the original error gives the user information
throw;
}
// TODO: make this cached somehow so its not read and re-opened a bunch
using (AssemblyDefinition assembly = AssemblyDefinition.ReadAssembly(filePath, new ReaderParameters {
ReadingMode = ReadingMode.Deferred
})) {
ModuleDefinition module = assembly.Modules.First(m => m.Name == moduleFrom.Name);
// this should only fail if the token itself is somehow wrong
MemberReference reference = (MemberReference)module.LookupToken(token);
// the explicit casts here are to throw if they are incorrect
// normally the references would need to be imported, but moduleTo isn't written to anywhere
switch (resolveMode)
{
case TokenResolutionMode.Type:
return((TypeReference)reference);
case TokenResolutionMode.Method:
return((MethodReference)reference);
case TokenResolutionMode.Field:
return((FieldReference)reference);
case TokenResolutionMode.Any:
return(reference);
default:
throw new NotSupportedException($"Invalid TokenResolutionMode {resolveMode}");
}
}
}
}
Instruction GetInstruction(int offset)
{
int last = bodyTo.Instructions.Count - 1;
if (offset < 0 || offset > bodyTo.Instructions[last].Offset)
{
return(null);
}
int min = 0;
int max = last;
while (min <= max)
{
int mid = min + ((max - min) / 2);
Instruction instr = bodyTo.Instructions[mid];
if (offset == instr.Offset)
{
return(instr);
}
if (offset < instr.Offset)
{
max = mid - 1;
}
else
{
min = mid + 1;
}
}
return(null);
}
}