public override void ProcessCall(RPContext ctx, int instrIndex) {
Instruction invoke = ctx.Body.Instructions[instrIndex];
var target = (IMethod)invoke.Operand;
// Value type proxy is not supported in mild mode.
if (target.DeclaringType.ResolveTypeDefThrow().IsValueType)
return;
// Skipping visibility is not supported in mild mode.
if (!target.ResolveThrow().IsPublic && !target.ResolveThrow().IsAssembly)
return;
Tuple<Code, TypeDef, IMethod> key = Tuple.Create(invoke.OpCode.Code, ctx.Method.DeclaringType, target);
MethodDef proxy;
if (!proxies.TryGetValue(key, out proxy)) {
MethodSig sig = CreateProxySignature(ctx, target, invoke.OpCode.Code == Code.Newobj);
proxy = new MethodDefUser(ctx.Name.RandomName(), sig);
proxy.Attributes = MethodAttributes.PrivateScope | MethodAttributes.Static;
proxy.ImplAttributes = MethodImplAttributes.Managed | MethodImplAttributes.IL;
ctx.Method.DeclaringType.Methods.Add(proxy);
// Fix peverify --- Non-virtual call to virtual methods must be done on this pointer
if (invoke.OpCode.Code == Code.Call && target.ResolveThrow().IsVirtual) {
proxy.IsStatic = false;
sig.HasThis = true;
sig.Params.RemoveAt(0);
}
ctx.Marker.Mark(proxy, ctx.Protection);
ctx.Name.Analyze(proxy);
ctx.Name.SetCanRename(proxy, false);
proxy.Body = new CilBody();
for (int i = 0; i < proxy.Parameters.Count; i++)
proxy.Body.Instructions.Add(Instruction.Create(OpCodes.Ldarg, proxy.Parameters[i]));
proxy.Body.Instructions.Add(Instruction.Create(invoke.OpCode, target));
proxy.Body.Instructions.Add(Instruction.Create(OpCodes.Ret));
proxies[key] = proxy;
}
invoke.OpCode = OpCodes.Call;
if (ctx.Method.DeclaringType.HasGenericParameters) {
var genArgs = new GenericVar[ctx.Method.DeclaringType.GenericParameters.Count];
for (int i = 0; i < genArgs.Length; i++)
genArgs[i] = new GenericVar(i);
invoke.Operand = new MemberRefUser(
ctx.Module,
proxy.Name,
proxy.MethodSig,
new GenericInstSig((ClassOrValueTypeSig)ctx.Method.DeclaringType.ToTypeSig(), genArgs).ToTypeDefOrRef());
}
else
invoke.Operand = proxy;
var targetDef = target.ResolveMethodDef();
if (targetDef != null)
ctx.Context.Annotations.Set(targetDef, ReferenceProxyProtection.Targeted, ReferenceProxyProtection.Targeted);
}
protected static TypeDef GetDelegateType(RPContext ctx, MethodSig sig)
{
TypeDef ret;
if (ctx.Delegates.TryGetValue(sig, out ret))
return ret;
ret = new TypeDefUser(ctx.Name.ObfuscateName(ctx.Method.DeclaringType.Namespace, RenameMode.Unicode), ctx.Name.RandomName(), ctx.Module.CorLibTypes.GetTypeRef("System", "MulticastDelegate"));
ret.Attributes = TypeAttributes.NotPublic | TypeAttributes.Sealed;
var ctor = new MethodDefUser(".ctor", MethodSig.CreateInstance(ctx.Module.CorLibTypes.Void, ctx.Module.CorLibTypes.Object, ctx.Module.CorLibTypes.IntPtr));
ctor.Attributes = MethodAttributes.Assembly | MethodAttributes.HideBySig | MethodAttributes.RTSpecialName | MethodAttributes.SpecialName;
ctor.ImplAttributes = MethodImplAttributes.Runtime;
ret.Methods.Add(ctor);
var invoke = new MethodDefUser("Invoke", sig.Clone());
invoke.MethodSig.HasThis = true;
invoke.Attributes = MethodAttributes.Assembly | MethodAttributes.HideBySig | MethodAttributes.Virtual | MethodAttributes.NewSlot;
invoke.ImplAttributes = MethodImplAttributes.Runtime;
ret.Methods.Add(invoke);
ctx.Module.Types.Add(ret);
foreach (IDnlibDef def in ret.FindDefinitions()) {
ctx.Marker.Mark(def);
ctx.Name.SetCanRename(def, false);
}
ctx.Delegates[sig] = ret;
return ret;
}
public Instruction[] EmitDecode(MethodDef init, RPContext ctx, Instruction[] arg) {
Tuple<MethodDef, Func<int, int>> key = GetKey(ctx, init);
var repl = new List<Instruction>();
repl.AddRange(arg);
repl.Add(Instruction.Create(OpCodes.Call, key.Item1));
return repl.ToArray();
}
public Instruction[] EmitDecode(MethodDef init, RPContext ctx, Instruction[] arg) {
Tuple<Expression, Func<int, int>> key = GetKey(ctx, init);
var invCompiled = new List<Instruction>();
new CodeGen(arg, ctx.Method, invCompiled).GenerateCIL(key.Item1);
init.Body.MaxStack += (ushort)ctx.Depth;
return invCompiled.ToArray();
}
private TypeDef GetKeyAttr(RPContext ctx)
{
if (keyAttrs == null)
{
keyAttrs = new Tuple <TypeDef, Func <int, int> > [0x10];
}
int index = ctx.Random.NextInt32(keyAttrs.Length);
if (keyAttrs[index] == null)
{
TypeDef rtType = ctx.Context.Registry.GetService <IRuntimeService>().GetRuntimeType("Confuser.Runtime.RefProxyKey");
TypeDef injectedAttr = InjectHelper.Inject(rtType, ctx.Module);
injectedAttr.Name = ctx.Name.RandomName();
injectedAttr.Namespace = string.Empty;
Expression expression, inverse;
var var = new Variable("{VAR}");
var result = new Variable("{RESULT}");
ctx.DynCipher.GenerateExpressionPair(
ctx.Random,
new VariableExpression {
Variable = var
}, new VariableExpression {
Variable = result
},
ctx.Depth, out expression, out inverse);
var expCompiled = new DMCodeGen(typeof(int), new[] { Tuple.Create("{VAR}", typeof(int)) })
.GenerateCIL(expression)
.Compile <Func <int, int> >();
MethodDef ctor = injectedAttr.FindMethod(".ctor");
MutationHelper.ReplacePlaceholder(ctor, arg => {
var invCompiled = new List <Instruction>();
new CodeGen(arg, ctor, invCompiled).GenerateCIL(inverse);
return(invCompiled.ToArray());
});
keyAttrs[index] = Tuple.Create(injectedAttr, expCompiled);
ctx.Module.AddAsNonNestedType(injectedAttr);
foreach (IDnlibDef def in injectedAttr.FindDefinitions())
{
if (def.Name == "GetHashCode")
{
ctx.Name.MarkHelper(def, ctx.Marker);
((MethodDef)def).Access = MethodAttributes.Public;
}
else
{
ctx.Name.MarkHelper(def, ctx.Marker);
}
}
}
return(keyAttrs[index].Item1);
}
void ProcessBridge(RPContext ctx, int instrIndex)
{
Instruction instr = ctx.Body.Instructions[instrIndex];
var target = (IMethod)instr.Operand;
TypeDef declType = target.DeclaringType.ResolveTypeDefThrow();
if (!declType.Module.IsILOnly) // Reflection doesn't like mixed mode modules.
{
return;
}
if (declType.IsGlobalModuleType) // Reflection doesn't like global methods too.
{
return;
}
Tuple <Code, IMethod, IRPEncoding> key = Tuple.Create(instr.OpCode.Code, target, ctx.EncodingHandler);
Tuple <FieldDef, MethodDef> proxy;
if (fields.TryGetValue(key, out proxy))
{
if (proxy.Item2 != null)
{
instr.OpCode = OpCodes.Call;
instr.Operand = proxy.Item2;
return;
}
}
else
{
proxy = new Tuple <FieldDef, MethodDef>(null, null);
}
MethodSig sig = CreateProxySignature(ctx, target, instr.OpCode.Code == Code.Newobj);
TypeDef delegateType = GetDelegateType(ctx, sig);
// Create proxy field
if (proxy.Item1 == null)
{
proxy = new Tuple <FieldDef, MethodDef>(
CreateField(ctx, delegateType),
proxy.Item2);
}
// Create proxy bridge
Debug.Assert(proxy.Item2 == null);
proxy = new Tuple <FieldDef, MethodDef>(
proxy.Item1,
CreateBridge(ctx, delegateType, proxy.Item1, sig));
fields[key] = proxy;
// Replace instruction
instr.OpCode = OpCodes.Call;
instr.Operand = proxy.Item2;
}
Tuple <Expression, Func <int, int> > GetKey(RPContext ctx, MethodDef init)
{
if (!keys.TryGetValue(init, out var ret))
{
Compile(ctx, init.Body, out var keyFunc, out var inverse);
keys[init] = ret = Tuple.Create(inverse, keyFunc);
}
return(ret);
}
Tuple <MethodDef, Func <int, int> > GetKey(RPContext ctx, MethodDef init)
{
if (!keys.TryGetValue(init, out var ret))
{
Compile(ctx, out var keyFunc, out var native);
keys[init] = ret = Tuple.Create(native, keyFunc);
}
return(ret);
}
public Instruction[] EmitDecode(MethodDef init, RPContext ctx, Instruction[] arg)
{
Tuple <MethodDef, Func <int, int> > key = GetKey(ctx, init);
var repl = new List <Instruction>();
repl.AddRange(arg);
repl.Add(Instruction.Create(OpCodes.Call, key.Item1));
return(repl.ToArray());
}
public Instruction[] EmitDecode(MethodDef init, RPContext ctx, Instruction[] arg)
{
Tuple <Expression, Func <int, int> > key = GetKey(ctx, init);
var invCompiled = new List <Instruction>();
new CodeGen(arg, ctx.Method, invCompiled).GenerateCIL(key.Item1);
init.Body.MaxStack += (ushort)ctx.Depth;
return(invCompiled.ToArray());
}
Tuple<Expression, Func<int, int>> GetKey(RPContext ctx, MethodDef init) {
Tuple<Expression, Func<int, int>> ret;
if (!keys.TryGetValue(init, out ret)) {
Func<int, int> keyFunc;
Expression inverse;
Compile(ctx, init.Body, out keyFunc, out inverse);
keys[init] = ret = Tuple.Create(inverse, keyFunc);
}
return ret;
}
Tuple<MethodDef, Func<int, int>> GetKey(RPContext ctx, MethodDef init) {
Tuple<MethodDef, Func<int, int>> ret;
if (!keys.TryGetValue(init, out ret)) {
Func<int, int> keyFunc;
MethodDef native;
Compile(ctx, out keyFunc, out native);
keys[init] = ret = Tuple.Create(native, keyFunc);
}
return ret;
}
static ITypeDefOrRef Import(RPContext ctx, TypeDef typeDef)
{
ITypeDefOrRef retTypeRef = new Importer(ctx.Module, ImporterOptions.TryToUseTypeDefs).Import(typeDef);
if (typeDef.Module != ctx.Module && ctx.Context.Modules.Contains((ModuleDefMD)typeDef.Module))
{
ctx.Name.AddReference(typeDef, new TypeRefReference((TypeRef)retTypeRef, typeDef));
}
return(retTypeRef);
}
void ProcessMethod(RPContext ctx)
{
for (int i = 0; i < ctx.Body.Instructions.Count; i++)
{
Instruction instr = ctx.Body.Instructions[i];
if (instr.OpCode.Code == Code.Call || instr.OpCode.Code == Code.Callvirt || instr.OpCode.Code == Code.Newobj)
{
var operand = (IMethod)instr.Operand;
// Call constructor
if (instr.OpCode.Code != Code.Newobj && operand.Name == ".ctor")
{
continue;
}
// Internal reference option
if (operand is MethodDef && !ctx.InternalAlso)
{
continue;
}
// No generic methods
if (operand is MethodSpec)
{
continue;
}
// No generic types / array types
if (operand.DeclaringType is TypeSpec)
{
continue;
}
// No varargs
if (operand.MethodSig.ParamsAfterSentinel != null &&
operand.MethodSig.ParamsAfterSentinel.Count > 0)
{
continue;
}
TypeDef declType = operand.DeclaringType.ResolveTypeDefThrow();
// No delegates
if (declType.IsDelegate())
{
continue;
}
// No instance value type methods
if (declType.IsValueType && operand.MethodSig.HasThis)
{
return;
}
// No prefixed call
if (i - 1 >= 0 && ctx.Body.Instructions[i - 1].OpCode.OpCodeType == OpCodeType.Prefix)
{
continue;
}
ctx.ModeHandler.ProcessCall(ctx, i);
}
}
}
private Tuple<MethodDef, Func<int, int>> GetKey(RPContext ctx, MethodDef init)
{
Tuple<MethodDef, Func<int, int>> ret;
if (!keys.TryGetValue(init, out ret)) {
Func<int, int> keyFunc;
MethodDef native;
Compile(ctx, out keyFunc, out native);
keys[init] = ret = Tuple.Create(native, keyFunc);
}
return ret;
}
private Tuple <Expression, Func <int, int> > GetKey(RPContext ctx, MethodDef init)
{
Tuple <Expression, Func <int, int> > ret;
if (!keys.TryGetValue(init, out ret))
{
Func <int, int> keyFunc;
Expression inverse;
Compile(ctx, init.Body, out keyFunc, out inverse);
keys[init] = ret = Tuple.Create(inverse, keyFunc);
}
return(ret);
}
static int?TraceBeginning(RPContext ctx, int index, int argCount)
{
if (ctx.BranchTargets.Contains(ctx.Body.Instructions[index]))
{
return(null);
}
var currentStack = argCount;
var currentIndex = index;
while (currentStack > 0)
{
currentIndex--;
var currentInstr = ctx.Body.Instructions[currentIndex];
// Disrupt stack analysis :/ Used by array initializer
if (currentInstr.OpCode == OpCodes.Pop || currentInstr.OpCode == OpCodes.Dup)
{
return(null);
}
// No branch instr.
switch (currentInstr.OpCode.FlowControl)
{
case FlowControl.Call:
case FlowControl.Break:
case FlowControl.Meta:
case FlowControl.Next:
break;
default:
return(null);
}
currentInstr.CalculateStackUsage(out var push, out var pop);
currentStack += pop;
currentStack -= push;
// No branch target
if (ctx.BranchTargets.Contains(currentInstr) && currentStack != 0)
{
return(null);
}
}
if (currentStack < 0)
{
return(null);
}
return(currentIndex);
}
public Instruction[] EmitDecode(MethodDef init, RPContext ctx, Instruction[] arg) {
Tuple<int, int> key = GetKey(ctx.Random, init);
var ret = new List<Instruction>();
if (ctx.Random.NextBoolean()) {
ret.Add(Instruction.Create(OpCodes.Ldc_I4, key.Item1));
ret.AddRange(arg);
}
else {
ret.AddRange(arg);
ret.Add(Instruction.Create(OpCodes.Ldc_I4, key.Item1));
}
ret.Add(Instruction.Create(OpCodes.Mul));
return ret.ToArray();
}
void Compile(RPContext ctx, CilBody body, out Func<int, int> expCompiled, out Expression inverse) {
var var = new Variable("{VAR}");
var result = new Variable("{RESULT}");
Expression expression;
ctx.DynCipher.GenerateExpressionPair(
ctx.Random,
new VariableExpression { Variable = var }, new VariableExpression { Variable = result },
ctx.Depth, out expression, out inverse);
expCompiled = new DMCodeGen(typeof(int), new[] { Tuple.Create("{VAR}", typeof(int)) })
.GenerateCIL(expression)
.Compile<Func<int, int>>();
}
InitMethodDesc GetInitMethod(RPContext ctx, IRPEncoding encoding)
{
InitMethodDesc[] initDescs;
if (!inits.TryGetValue(encoding, out initDescs))
{
inits[encoding] = initDescs = new InitMethodDesc[ctx.InitCount];
}
int index = ctx.Random.NextInt32(initDescs.Length);
if (initDescs[index] == null)
{
TypeDef rtType = ctx.Context.Registry.GetService <IRuntimeService>().GetRuntimeType("Confuser.Runtime.RefProxyStrong");
MethodDef injectedMethod = InjectHelper.Inject(rtType.FindMethod("Initialize"), ctx.Module);
ctx.Module.GlobalType.Methods.Add(injectedMethod);
injectedMethod.Access = MethodAttributes.PrivateScope;
injectedMethod.Name = ctx.Name.RandomName();
ctx.Name.SetCanRename(injectedMethod, false);
ctx.Marker.Mark(injectedMethod, ctx.Protection);
var desc = new InitMethodDesc {
Method = injectedMethod
};
// Field name has five bytes, each bytes has different order & meaning
int[] order = Enumerable.Range(0, 5).ToArray();
ctx.Random.Shuffle(order);
desc.OpCodeIndex = order[4];
desc.TokenNameOrder = new int[4];
Array.Copy(order, 0, desc.TokenNameOrder, 0, 4);
desc.TokenByteOrder = Enumerable.Range(0, 4).Select(x => x * 8).ToArray();
ctx.Random.Shuffle(desc.TokenByteOrder);
var keyInjection = new int[9];
Array.Copy(desc.TokenNameOrder, 0, keyInjection, 0, 4);
Array.Copy(desc.TokenByteOrder, 0, keyInjection, 4, 4);
keyInjection[8] = desc.OpCodeIndex;
MutationHelper.InjectKeys(injectedMethod, Enumerable.Range(0, 9).ToArray(), keyInjection);
// Encoding
MutationHelper.ReplacePlaceholder(injectedMethod, arg => { return(encoding.EmitDecode(injectedMethod, ctx, arg)); });
desc.Encoding = encoding;
initDescs[index] = desc;
}
return(initDescs[index]);
}
void Compile(RPContext ctx, out Func <int, int> expCompiled, out MethodDef native)
{
var var = new Variable("{VAR}");
var result = new Variable("{RESULT}");
var int32 = ctx.Module.CorLibTypes.Int32;
native = new MethodDefUser(ctx.Context.Registry.GetService <INameService>().RandomName(), MethodSig.CreateStatic(int32, int32), MethodAttributes.PinvokeImpl | MethodAttributes.PrivateScope | MethodAttributes.Static)
{
ImplAttributes = MethodImplAttributes.Native | MethodImplAttributes.Unmanaged | MethodImplAttributes.PreserveSig
};
ctx.Module.GlobalType.Methods.Add(native);
ctx.Context.Registry.GetService <IMarkerService>().Mark(native, ctx.Protection);
ctx.Context.Registry.GetService <INameService>().SetCanRename(native, false);
x86Register?reg;
var codeGen = new x86CodeGen();
Expression expression;
do
{
ctx.DynCipher.GenerateExpressionPair(
ctx.Random,
new VariableExpression {
Variable = var
}, new VariableExpression {
Variable = result
},
ctx.Depth, out expression, out var inverse);
reg = codeGen.GenerateX86(inverse, (v, r) => { return(new[] { x86Instruction.Create(x86OpCode.POP, new x86RegisterOperand(r)) }); });
} while (reg == null);
var code = CodeGenUtils.AssembleCode(codeGen, reg.Value);
expCompiled = new DMCodeGen(typeof(int), new[] { Tuple.Create("{VAR}", typeof(int)) })
.GenerateCIL(expression)
.Compile <Func <int, int> >();
nativeCodes.Add(Tuple.Create(native, code, (MethodBody)null));
if (!addedHandler)
{
ctx.Context.CurrentModuleWriterListener.OnWriterEvent += InjectNativeCode;
addedHandler = true;
}
}
protected static MethodSig CreateProxySignature(RPContext ctx, IMethod method, bool newObj)
{
ModuleDef module = ctx.Module;
if (newObj)
{
Debug.Assert(method.MethodSig.HasThis);
Debug.Assert(method.Name == ".ctor");
TypeSig[] paramTypes = method.MethodSig.Params.Select(type =>
{
if (ctx.TypeErasure && type.IsClassSig && method.MethodSig.HasThis)
{
return(module.CorLibTypes.Object);
}
return(type);
}).ToArray();
TypeSig retType;
if (ctx.TypeErasure) // newobj will not be used with value types
{
retType = module.CorLibTypes.Object;
}
else
{
TypeDef declType = method.DeclaringType.ResolveTypeDefThrow();
retType = Import(ctx, declType).ToTypeSig();
}
return(MethodSig.CreateStatic(retType, paramTypes));
}
else
{
IEnumerable <TypeSig> paramTypes = method.MethodSig.Params.Select(type =>
{
if (ctx.TypeErasure && type.IsClassSig && method.MethodSig.HasThis)
{
return(module.CorLibTypes.Object);
}
return(type);
});
if (method.MethodSig.HasThis && !method.MethodSig.ExplicitThis)
{
TypeDef declType = method.DeclaringType.ResolveTypeDefThrow();
if (ctx.TypeErasure && !declType.IsValueType)
{
paramTypes = new[] { module.CorLibTypes.Object }
}
void ProcessInvoke(RPContext ctx, int instrIndex, int argBeginIndex)
{
Instruction instr = ctx.Body.Instructions[instrIndex];
var target = (IMethod)instr.Operand;
MethodSig sig = CreateProxySignature(ctx, target, instr.OpCode.Code == Code.Newobj);
TypeDef delegateType = GetDelegateType(ctx, sig);
Tuple <Code, IMethod, IRPEncoding> key = Tuple.Create(instr.OpCode.Code, target, ctx.EncodingHandler);
Tuple <FieldDef, MethodDef> proxy;
if (!fields.TryGetValue(key, out proxy))
{
// Create proxy field
proxy = new Tuple <FieldDef, MethodDef>(CreateField(ctx, delegateType), null);
fields[key] = proxy;
}
// Insert field load & replace instruction
if (argBeginIndex == instrIndex)
{
ctx.Body.Instructions.Insert(instrIndex + 1,
new Instruction(OpCodes.Call, delegateType.FindMethod("Invoke")));
instr.OpCode = OpCodes.Ldsfld;
instr.Operand = proxy.Item1;
}
else
{
Instruction argBegin = ctx.Body.Instructions[argBeginIndex];
ctx.Body.Instructions.Insert(argBeginIndex + 1,
new Instruction(argBegin.OpCode, argBegin.Operand));
argBegin.OpCode = OpCodes.Ldsfld;
argBegin.Operand = proxy.Item1;
instr.OpCode = OpCodes.Call;
instr.Operand = delegateType.FindMethod("Invoke");
}
var targetDef = target.ResolveMethodDef();
if (targetDef != null)
{
ctx.Context.Annotations.Set(targetDef, ReferenceProxyProtection.Targeted, ReferenceProxyProtection.Targeted);
}
}
static RPContext ParseParameters(ModuleDef module, ConfuserContext context, ProtectionParameters parameters, RPStore store)
{
var ret = new RPContext();
ret.Depth = parameters.GetParameter(context, module, "depth", 3);
ret.InitCount = parameters.GetParameter(context, module, "initCount", 0x10);
ret.Random = store.random;
ret.Module = module;
ret.Context = context;
ret.Marker = context.Registry.GetService <IMarkerService>();
ret.DynCipher = context.Registry.GetService <IDynCipherService>();
ret.Name = context.Registry.GetService <INameService>();
ret.Delegates = store.delegates;
return(ret);
}
public Instruction[] EmitDecode(MethodDef init, RPContext ctx, Instruction[] arg)
{
var key = GetKey(ctx.Random, init);
var ret = new List <Instruction>();
if (ctx.Random.NextBoolean())
{
ret.Add(Instruction.Create(OpCodes.Ldc_I4, key.Item1));
ret.AddRange(arg);
}
else
{
ret.AddRange(arg);
ret.Add(Instruction.Create(OpCodes.Ldc_I4, key.Item1));
}
ret.Add(Instruction.Create(OpCodes.Mul));
return(ret.ToArray());
}
void Compile(RPContext ctx, CilBody body, out Func <int, int> expCompiled, out Expression inverse)
{
var var = new Variable("{VAR}");
var result = new Variable("{RESULT}");
ctx.DynCipher.GenerateExpressionPair(
ctx.Random,
new VariableExpression {
Variable = var
}, new VariableExpression {
Variable = result
},
ctx.Depth, out var expression, out inverse);
expCompiled = new DMCodeGen(typeof(int), new[] { Tuple.Create("{VAR}", typeof(int)) })
.GenerateCIL(expression)
.Compile <Func <int, int> >();
}
protected static MethodSig CreateProxySignature(RPContext ctx, IMethod method, bool newObj)
{
ModuleDef module = ctx.Module;
if (newObj) {
Debug.Assert(method.MethodSig.HasThis);
Debug.Assert(method.Name == ".ctor");
TypeSig[] paramTypes = method.MethodSig.Params.Select(type => {
if (ctx.TypeErasure && type.IsClassSig && method.MethodSig.HasThis)
return module.CorLibTypes.Object;
return type;
}).ToArray();
TypeSig retType;
if (ctx.TypeErasure) // newobj will not be used with value types
retType = module.CorLibTypes.Object;
else {
TypeDef declType = method.DeclaringType.ResolveTypeDefThrow();
retType = Import(ctx, declType).ToTypeSig();
}
return MethodSig.CreateStatic(retType, paramTypes);
}
else {
IEnumerable<TypeSig> paramTypes = method.MethodSig.Params.Select(type => {
if (ctx.TypeErasure && type.IsClassSig && method.MethodSig.HasThis)
return module.CorLibTypes.Object;
return type;
});
if (method.MethodSig.HasThis && !method.MethodSig.ExplicitThis) {
TypeDef declType = method.DeclaringType.ResolveTypeDefThrow();
if (ctx.TypeErasure && !declType.IsValueType)
paramTypes = new[] { module.CorLibTypes.Object }.Concat(paramTypes);
else
paramTypes = new[] { Import(ctx, declType).ToTypeSig() }.Concat(paramTypes);
}
TypeSig retType = method.MethodSig.RetType;
if (ctx.TypeErasure && retType.IsClassSig)
retType = module.CorLibTypes.Object;
return MethodSig.CreateStatic(retType, paramTypes.ToArray());
}
}
public override void Finalize(RPContext ctx)
{
foreach (var field in fields)
{
InitMethodDesc init = GetInitMethod(ctx, field.Key.Item3);
byte opKey;
do
{
// No zero bytes
opKey = ctx.Random.NextByte();
} while (opKey == (byte)field.Key.Item1);
TypeDef delegateType = field.Value.Item1.DeclaringType;
MethodDef cctor = delegateType.FindOrCreateStaticConstructor();
cctor.Body.Instructions.Insert(0, Instruction.Create(OpCodes.Call, init.Method));
cctor.Body.Instructions.Insert(0, Instruction.CreateLdcI4(opKey));
cctor.Body.Instructions.Insert(0, Instruction.Create(OpCodes.Ldtoken, field.Value.Item1));
fieldDescs.Add(new FieldDesc
{
Field = field.Value.Item1,
OpCode = field.Key.Item1,
Method = field.Key.Item2,
OpKey = opKey,
InitDesc = init
});
}
foreach (TypeDef delegateType in ctx.Delegates.Values)
{
MethodDef cctor = delegateType.FindOrCreateStaticConstructor();
ctx.Marker.Mark(cctor, ctx.Protection);
ctx.Name.SetCanRename(cctor, false);
}
ctx.Context.CurrentModuleWriterOptions.MetaDataOptions.Flags |= MetaDataFlags.PreserveExtraSignatureData;
ctx.Context.CurrentModuleWriterListener.OnWriterEvent += EncodeField;
encodeCtx = ctx;
}
protected override void Execute(ConfuserContext context, ProtectionParameters parameters)
{
RandomGenerator random = context.Registry.GetService <IRandomService>().GetRandomGenerator(ReferenceProxyProtection._FullId);
var store = new RPStore {
random = random
};
foreach (MethodDef method in parameters.Targets.OfType <MethodDef>().WithProgress(context.Logger))
{
if (method.HasBody && method.Body.Instructions.Count > 0)
{
ProcessMethod(ParseParameters(method, context, parameters, store));
context.CheckCancellation();
}
}
RPContext ctx = ParseParameters(context.CurrentModule, context, parameters, store);
store.mild?.Finalize(ctx);
store.strong?.Finalize(ctx);
}
FieldDef CreateField(RPContext ctx, TypeDef delegateType)
{
// Details will be filled in during metadata writing
TypeDef randomType;
do
{
randomType = ctx.Module.Types[ctx.Random.NextInt32(ctx.Module.Types.Count)];
} while (randomType.HasGenericParameters || randomType.IsGlobalModuleType || randomType.IsDelegate());
TypeSig fieldType = new CModOptSig(randomType, delegateType.ToTypeSig());
var field = new FieldDefUser("", new FieldSig(fieldType), FieldAttributes.Static | FieldAttributes.Assembly);
field.CustomAttributes.Add(new CustomAttribute(GetKeyAttr(ctx).FindInstanceConstructors().First()));
delegateType.Fields.Add(field);
ctx.Marker.Mark(field, ctx.Protection);
ctx.Name.SetCanRename(field, false);
return(field);
}
public override void ProcessCall(RPContext ctx, int instrIndex) {
Instruction invoke = ctx.Body.Instructions[instrIndex];
TypeDef declType = ((IMethod)invoke.Operand).DeclaringType.ResolveTypeDefThrow();
if (!declType.Module.IsILOnly) // Reflection doesn't like mixed mode modules.
return;
if (declType.IsGlobalModuleType) // Reflection doesn't like global methods too.
return;
int push, pop;
invoke.CalculateStackUsage(out push, out pop);
int? begin = TraceBeginning(ctx, instrIndex, pop);
// Fail to trace the arguments => fall back to bridge method
bool fallBack = begin == null;
if (fallBack) {
ProcessBridge(ctx, instrIndex);
}
else {
ProcessInvoke(ctx, instrIndex, begin.Value);
}
}
protected static TypeDef GetDelegateType(RPContext ctx, MethodSig sig)
{
if (ctx.Delegates.TryGetValue(sig, out var ret))
{
return(ret);
}
ret = new TypeDefUser(ctx.Name.ObfuscateName(ctx.Method.DeclaringType.Namespace, RenameMode.Unicode), ctx.Name.RandomName(), ctx.Module.CorLibTypes.GetTypeRef("System", "MulticastDelegate"))
{
Attributes = TypeAttributes.NotPublic | TypeAttributes.Sealed
};
var ctor = new MethodDefUser(".ctor", MethodSig.CreateInstance(ctx.Module.CorLibTypes.Void, ctx.Module.CorLibTypes.Object, ctx.Module.CorLibTypes.IntPtr))
{
Attributes = MethodAttributes.Assembly | MethodAttributes.HideBySig | MethodAttributes.RTSpecialName | MethodAttributes.SpecialName,
ImplAttributes = MethodImplAttributes.Runtime
};
ret.Methods.Add(ctor);
var invoke = new MethodDefUser("Invoke", sig.Clone());
invoke.MethodSig.HasThis = true;
invoke.Attributes = MethodAttributes.Assembly | MethodAttributes.HideBySig | MethodAttributes.Virtual | MethodAttributes.NewSlot;
invoke.ImplAttributes = MethodImplAttributes.Runtime;
ret.Methods.Add(invoke);
ctx.Module.Types.Add(ret);
foreach (var def in ret.FindDefinitions())
{
ctx.Marker.Mark(def, ctx.Protection);
ctx.Name.SetCanRename(def, false);
}
ctx.Delegates[sig] = ret;
return(ret);
}
static int? TraceBeginning(RPContext ctx, int index, int argCount) {
if (ctx.BranchTargets.Contains(ctx.Body.Instructions[index]))
return null;
int currentStack = argCount;
int currentIndex = index;
while (currentStack > 0) {
currentIndex--;
Instruction currentInstr = ctx.Body.Instructions[currentIndex];
// Disrupt stack analysis :/ Used by array initializer
if (currentInstr.OpCode == OpCodes.Pop || currentInstr.OpCode == OpCodes.Dup)
return null;
// No branch instr.
switch (currentInstr.OpCode.FlowControl) {
case FlowControl.Call:
case FlowControl.Break:
case FlowControl.Meta:
case FlowControl.Next:
break;
default:
return null;
}
int push, pop;
currentInstr.CalculateStackUsage(out push, out pop);
currentStack += pop;
currentStack -= push;
// No branch target
if (ctx.BranchTargets.Contains(currentInstr) && currentStack != 0)
return null;
}
if (currentStack < 0)
return null;
return currentIndex;
}
MethodDef CreateBridge(RPContext ctx, TypeDef delegateType, FieldDef field, MethodSig sig)
{
var method = new MethodDefUser(ctx.Name.RandomName(), sig);
method.Attributes = MethodAttributes.PrivateScope | MethodAttributes.Static;
method.ImplAttributes = MethodImplAttributes.Managed | MethodImplAttributes.IL;
method.Body = new CilBody();
method.Body.Instructions.Add(Instruction.Create(OpCodes.Ldsfld, field));
for (int i = 0; i < method.Parameters.Count; i++)
{
method.Body.Instructions.Add(Instruction.Create(OpCodes.Ldarg, method.Parameters[i]));
}
method.Body.Instructions.Add(Instruction.Create(OpCodes.Call, delegateType.FindMethod("Invoke")));
method.Body.Instructions.Add(Instruction.Create(OpCodes.Ret));
delegateType.Methods.Add(method);
ctx.Context.Registry.GetService <IMarkerService>().Mark(method, ctx.Protection);
ctx.Name.SetCanRename(method, false);
return(method);
}
private void Compile(RPContext ctx, out Func<int, int> expCompiled, out MethodDef native)
{
var var = new Variable("{VAR}");
var result = new Variable("{RESULT}");
CorLibTypeSig int32 = ctx.Module.CorLibTypes.Int32;
native = new MethodDefUser(ctx.Context.Registry.GetService<INameService>().RandomName(), MethodSig.CreateStatic(int32, int32), MethodAttributes.PinvokeImpl | MethodAttributes.PrivateScope | MethodAttributes.Static);
native.ImplAttributes = MethodImplAttributes.Native | MethodImplAttributes.Unmanaged | MethodImplAttributes.PreserveSig;
ctx.Module.GlobalType.Methods.Add(native);
ctx.Context.Registry.GetService<IMarkerService>().Mark(native);
ctx.Context.Registry.GetService<INameService>().SetCanRename(native, false);
x86Register? reg;
var codeGen = new x86CodeGen();
Expression expression, inverse;
do {
ctx.DynCipher.GenerateExpressionPair(
ctx.Random,
new VariableExpression { Variable = var }, new VariableExpression { Variable = result },
ctx.Depth, out expression, out inverse);
reg = codeGen.GenerateX86(inverse, (v, r) => { return new[] { x86Instruction.Create(x86OpCode.POP, new x86RegisterOperand(r)) }; });
} while (reg == null);
byte[] code = CodeGenUtils.AssembleCode(codeGen, reg.Value);
expCompiled = new DMCodeGen(typeof(int), new[] { Tuple.Create("{VAR}", typeof(int)) })
.GenerateCIL(expression)
.Compile<Func<int, int>>();
nativeCodes.Add(Tuple.Create(native, code, (MethodBody)null));
if (!addedHandler) {
ctx.Context.CurrentModuleWriterListener.OnWriterEvent += InjectNativeCode;
addedHandler = true;
}
}
public override void Finalize(RPContext ctx)
{
foreach (var field in fields) {
InitMethodDesc init = GetInitMethod(ctx, field.Key.Item3);
byte opKey;
do {
// No zero bytes
opKey = ctx.Random.NextByte();
} while (opKey == (byte)field.Key.Item1);
TypeDef delegateType = field.Value.Item1.DeclaringType;
MethodDef cctor = delegateType.FindOrCreateStaticConstructor();
cctor.Body.Instructions.Insert(0, Instruction.Create(OpCodes.Call, init.Method));
cctor.Body.Instructions.Insert(0, Instruction.CreateLdcI4(opKey));
cctor.Body.Instructions.Insert(0, Instruction.Create(OpCodes.Ldtoken, field.Value.Item1));
fieldDescs.Add(new FieldDesc {
Field = field.Value.Item1,
OpCode = field.Key.Item1,
Method = field.Key.Item2,
OpKey = opKey,
InitDesc = init
});
}
foreach (TypeDef delegateType in ctx.Delegates.Values) {
MethodDef cctor = delegateType.FindOrCreateStaticConstructor();
ctx.Marker.Mark(cctor);
ctx.Name.SetCanRename(cctor, false);
}
ctx.Context.CurrentModuleWriterOptions.MetaDataOptions.Flags |= MetaDataFlags.PreserveExtraSignatureData;
ctx.Context.CurrentModuleWriterListener.OnWriterEvent += EncodeField;
encodeCtx = ctx;
}
public override void ProcessCall(RPContext ctx, int instrIndex)
{
var invoke = ctx.Body.Instructions[instrIndex];
var target = (IMethod)invoke.Operand;
// Value type proxy is not supported in mild mode.
if (target.DeclaringType.ResolveTypeDefThrow().IsValueType)
{
return;
}
// Skipping visibility is not supported in mild mode.
if (!target.ResolveThrow().IsPublic&& !target.ResolveThrow().IsAssembly)
{
return;
}
var key = Tuple.Create(invoke.OpCode.Code, ctx.Method.DeclaringType, target);
if (!proxies.TryGetValue(key, out var proxy))
{
var sig = CreateProxySignature(ctx, target, invoke.OpCode.Code == Code.Newobj);
proxy = new MethodDefUser(ctx.Name.RandomName(), sig)
{
Attributes = MethodAttributes.PrivateScope | MethodAttributes.Static,
ImplAttributes = MethodImplAttributes.Managed | MethodImplAttributes.IL
};
ctx.Method.DeclaringType.Methods.Add(proxy);
// Fix peverify --- Non-virtual call to virtual methods must be done on this pointer
if (invoke.OpCode.Code == Code.Call && target.ResolveThrow().IsVirtual)
{
proxy.IsStatic = false;
sig.HasThis = true;
sig.Params.RemoveAt(0);
}
ctx.Marker.Mark(proxy, ctx.Protection);
ctx.Name.Analyze(proxy);
ctx.Name.SetCanRename(proxy, false);
proxy.Body = new CilBody();
for (var i = 0; i < proxy.Parameters.Count; i++)
{
proxy.Body.Instructions.Add(Instruction.Create(OpCodes.Ldarg, proxy.Parameters[i]));
}
proxy.Body.Instructions.Add(Instruction.Create(invoke.OpCode, target));
proxy.Body.Instructions.Add(Instruction.Create(OpCodes.Ret));
proxies[key] = proxy;
}
invoke.OpCode = OpCodes.Call;
if (ctx.Method.DeclaringType.HasGenericParameters)
{
var genArgs = new GenericVar[ctx.Method.DeclaringType.GenericParameters.Count];
for (var i = 0; i < genArgs.Length; i++)
{
genArgs[i] = new GenericVar(i);
}
invoke.Operand = new MemberRefUser(
ctx.Module,
proxy.Name,
proxy.MethodSig,
new GenericInstSig((ClassOrValueTypeSig)ctx.Method.DeclaringType.ToTypeSig(), genArgs).ToTypeDefOrRef());
}
else
{
invoke.Operand = proxy;
}
var targetDef = target.ResolveMethodDef();
if (targetDef != null)
{
ctx.Context.Annotations.Set(targetDef, ReferenceProxyProtection.Targeted, ReferenceProxyProtection.Targeted);
}
}
public override void Finalize(RPContext ctx)
{
}
RPContext ParseParameters(MethodDef method, ConfuserContext context, ProtectionParameters parameters, RPStore store)
{
var ret = new RPContext();
ret.Mode = parameters.GetParameter(context, method, "mode", Mode.Mild);
ret.Encoding = parameters.GetParameter(context, method, "encoding", EncodingType.Normal);
ret.InternalAlso = parameters.GetParameter(context, method, "internal", false);
ret.TypeErasure = parameters.GetParameter(context, method, "typeErasure", false);
ret.Depth = parameters.GetParameter(context, method, "depth", 3);
ret.Module = method.Module;
ret.Method = method;
ret.Body = method.Body;
ret.BranchTargets = new HashSet <Instruction>(
method.Body.Instructions
.Select(instr => instr.Operand as Instruction)
.Concat(method.Body.Instructions
.Where(instr => instr.Operand is Instruction[])
.SelectMany(instr => (Instruction[])instr.Operand))
.Where(target => target != null));
ret.Protection = (ReferenceProxyProtection)Parent;
ret.Random = store.random;
ret.Context = context;
ret.Marker = context.Registry.GetService <IMarkerService>();
ret.DynCipher = context.Registry.GetService <IDynCipherService>();
ret.Name = context.Registry.GetService <INameService>();
ret.Delegates = store.delegates;
switch (ret.Mode)
{
case Mode.Mild:
ret.ModeHandler = store.mild ?? (store.mild = new MildMode());
break;
case Mode.Strong:
ret.ModeHandler = store.strong ?? (store.strong = new StrongMode());
break;
default:
throw new UnreachableException();
}
switch (ret.Encoding)
{
case EncodingType.Normal:
ret.EncodingHandler = store.normal ?? (store.normal = new NormalEncoding());
break;
case EncodingType.Expression:
ret.EncodingHandler = store.expression ?? (store.expression = new ExpressionEncoding());
break;
case EncodingType.x86:
ret.EncodingHandler = store.x86 ?? (store.x86 = new x86Encoding());
if ((context.CurrentModule.Cor20HeaderFlags & ComImageFlags.ILOnly) != 0)
{
context.CurrentModuleWriterOptions.Cor20HeaderOptions.Flags &= ~ComImageFlags.ILOnly;
}
break;
default:
throw new UnreachableException();
}
return(ret);
}
public int Encode(MethodDef init, RPContext ctx, int value) {
Tuple<int, int> key = GetKey(ctx.Random, init);
return value * key.Item2;
}
public int Encode(MethodDef init, RPContext ctx, int value) {
Tuple<Expression, Func<int, int>> key = GetKey(ctx, init);
return key.Item2(value);
}
public abstract void Finalize(RPContext ctx);
private InitMethodDesc GetInitMethod(RPContext ctx, IRPEncoding encoding)
{
InitMethodDesc[] initDescs;
if (!inits.TryGetValue(encoding, out initDescs))
inits[encoding] = initDescs = new InitMethodDesc[ctx.InitCount];
int index = ctx.Random.NextInt32(initDescs.Length);
if (initDescs[index] == null) {
TypeDef rtType = ctx.Context.Registry.GetService<IRuntimeService>().GetRuntimeType("Confuser.Runtime.RefProxyStrong");
MethodDef injectedMethod = InjectHelper.Inject(rtType.FindMethod("Initialize"), ctx.Module);
ctx.Module.GlobalType.Methods.Add(injectedMethod);
injectedMethod.Access = MethodAttributes.PrivateScope;
injectedMethod.Name = ctx.Name.RandomName();
ctx.Name.SetCanRename(injectedMethod, false);
ctx.Marker.Mark(injectedMethod);
var desc = new InitMethodDesc { Method = injectedMethod };
// Field name has five bytes, each bytes has different order & meaning
int[] order = Enumerable.Range(0, 5).ToArray();
ctx.Random.Shuffle(order);
desc.OpCodeIndex = order[4];
desc.TokenNameOrder = new int[4];
Array.Copy(order, 0, desc.TokenNameOrder, 0, 4);
desc.TokenByteOrder = Enumerable.Range(0, 4).Select(x => x * 8).ToArray();
ctx.Random.Shuffle(desc.TokenByteOrder);
var keyInjection = new int[9];
Array.Copy(desc.TokenNameOrder, 0, keyInjection, 0, 4);
Array.Copy(desc.TokenByteOrder, 0, keyInjection, 4, 4);
keyInjection[8] = desc.OpCodeIndex;
MutationHelper.InjectKeys(injectedMethod, Enumerable.Range(0, 9).ToArray(), keyInjection);
// Encoding
MutationHelper.ReplacePlaceholder(injectedMethod, arg => { return encoding.EmitDecode(injectedMethod, ctx, arg); });
desc.Encoding = encoding;
initDescs[index] = desc;
}
return initDescs[index];
}
private FieldDef CreateField(RPContext ctx, TypeDef delegateType)
{
// Details will be filled in during metadata writing
TypeDef randomType;
do {
randomType = ctx.Module.Types[ctx.Random.NextInt32(ctx.Module.Types.Count)];
} while (randomType.HasGenericParameters || randomType.IsGlobalModuleType || randomType.IsDelegate());
TypeSig fieldType = new CModOptSig(randomType, delegateType.ToTypeSig());
var field = new FieldDefUser("", new FieldSig(fieldType), FieldAttributes.Static | FieldAttributes.Assembly);
field.CustomAttributes.Add(new CustomAttribute(GetKeyAttr(ctx).FindInstanceConstructors().First()));
delegateType.Fields.Add(field);
ctx.Marker.Mark(field);
ctx.Name.SetCanRename(field, false);
return field;
}
public abstract void Finalize(RPContext ctx);
public int Encode(MethodDef init, RPContext ctx, int value)
{
Tuple <Expression, Func <int, int> > key = GetKey(ctx, init);
return(key.Item2(value));
}
public abstract void ProcessCall(RPContext ctx, int instrIndex);
public override void Finalize(RPContext ctx)
{
}
private TypeDef GetKeyAttr(RPContext ctx)
{
if (keyAttrs == null)
keyAttrs = new Tuple<TypeDef, Func<int, int>>[0x10];
int index = ctx.Random.NextInt32(keyAttrs.Length);
if (keyAttrs[index] == null) {
TypeDef rtType = ctx.Context.Registry.GetService<IRuntimeService>().GetRuntimeType("Confuser.Runtime.RefProxyKey");
TypeDef injectedAttr = InjectHelper.Inject(rtType, ctx.Module);
injectedAttr.Name = ctx.Name.RandomName();
injectedAttr.Namespace = string.Empty;
Expression expression, inverse;
var var = new Variable("{VAR}");
var result = new Variable("{RESULT}");
ctx.DynCipher.GenerateExpressionPair(
ctx.Random,
new VariableExpression { Variable = var }, new VariableExpression { Variable = result },
ctx.Depth, out expression, out inverse);
var expCompiled = new DMCodeGen(typeof(int), new[] { Tuple.Create("{VAR}", typeof(int)) })
.GenerateCIL(expression)
.Compile<Func<int, int>>();
MethodDef ctor = injectedAttr.FindMethod(".ctor");
MutationHelper.ReplacePlaceholder(ctor, arg => {
var invCompiled = new List<Instruction>();
new CodeGen(arg, ctor, invCompiled).GenerateCIL(inverse);
return invCompiled.ToArray();
});
keyAttrs[index] = Tuple.Create(injectedAttr, expCompiled);
ctx.Module.AddAsNonNestedType(injectedAttr);
foreach (IDnlibDef def in injectedAttr.FindDefinitions()) {
if (def.Name == "GetHashCode") {
ctx.Name.MarkHelper(def, ctx.Marker);
((MethodDef)def).Access = MethodAttributes.Public;
}
else
ctx.Name.MarkHelper(def, ctx.Marker);
}
}
return keyAttrs[index].Item1;
}
public int Encode(MethodDef init, RPContext ctx, int value)
{
var key = GetKey(ctx.Random, init);
return(value * key.Item2);
}
private MethodDef CreateBridge(RPContext ctx, TypeDef delegateType, FieldDef field, MethodSig sig)
{
var method = new MethodDefUser(ctx.Name.RandomName(), sig);
method.Attributes = MethodAttributes.PrivateScope | MethodAttributes.Static;
method.ImplAttributes = MethodImplAttributes.Managed | MethodImplAttributes.IL;
method.Body = new CilBody();
method.Body.Instructions.Add(Instruction.Create(OpCodes.Ldsfld, field));
for (int i = 0; i < method.Parameters.Count; i++)
method.Body.Instructions.Add(Instruction.Create(OpCodes.Ldarg, method.Parameters[i]));
method.Body.Instructions.Add(Instruction.Create(OpCodes.Call, delegateType.FindMethod("Invoke")));
method.Body.Instructions.Add(Instruction.Create(OpCodes.Ret));
delegateType.Methods.Add(method);
ctx.Context.Registry.GetService<IMarkerService>().Mark(method);
ctx.Name.SetCanRename(method, false);
return method;
}
public abstract void ProcessCall(RPContext ctx, int instrIndex);
private static ITypeDefOrRef Import(RPContext ctx, TypeDef typeDef)
{
ITypeDefOrRef retTypeRef = new Importer(ctx.Module, ImporterOptions.TryToUseTypeDefs).Import(typeDef);
if (typeDef.Module != ctx.Module && ctx.Context.Modules.Contains((ModuleDefMD)typeDef.Module))
ctx.Name.AddReference(typeDef, new TypeRefReference((TypeRef)retTypeRef, typeDef));
return retTypeRef;
}
private void ProcessInvoke(RPContext ctx, int instrIndex, int argBeginIndex)
{
Instruction instr = ctx.Body.Instructions[instrIndex];
var target = (IMethod)instr.Operand;
MethodSig sig = CreateProxySignature(ctx, target, instr.OpCode.Code == Code.Newobj);
TypeDef delegateType = GetDelegateType(ctx, sig);
Tuple<Code, IMethod, IRPEncoding> key = Tuple.Create(instr.OpCode.Code, target, ctx.EncodingHandler);
Tuple<FieldDef, MethodDef> proxy;
if (!fields.TryGetValue(key, out proxy)) {
// Create proxy field
proxy = new Tuple<FieldDef, MethodDef>(CreateField(ctx, delegateType), null);
fields[key] = proxy;
}
// Insert field load & replace instruction
if (argBeginIndex == instrIndex) {
ctx.Body.Instructions.Insert(instrIndex + 1,
new Instruction(OpCodes.Call, delegateType.FindMethod("Invoke")));
instr.OpCode = OpCodes.Ldsfld;
instr.Operand = proxy.Item1;
}
else {
Instruction argBegin = ctx.Body.Instructions[argBeginIndex];
ctx.Body.Instructions.Insert(argBeginIndex + 1,
new Instruction(argBegin.OpCode, argBegin.Operand));
argBegin.OpCode = OpCodes.Ldsfld;
argBegin.Operand = proxy.Item1;
instr.OpCode = OpCodes.Call;
instr.Operand = delegateType.FindMethod("Invoke");
}
}
private void ProcessBridge(RPContext ctx, int instrIndex)
{
Instruction instr = ctx.Body.Instructions[instrIndex];
var target = (IMethod)instr.Operand;
TypeDef declType = target.DeclaringType.ResolveTypeDefThrow();
if (!declType.Module.IsILOnly) // Reflection doesn't like mixed mode modules.
return;
if (declType.IsGlobalModuleType) // Reflection doesn't like global methods too.
return;
Tuple<Code, IMethod, IRPEncoding> key = Tuple.Create(instr.OpCode.Code, target, ctx.EncodingHandler);
Tuple<FieldDef, MethodDef> proxy;
if (fields.TryGetValue(key, out proxy)) {
if (proxy.Item2 != null) {
instr.OpCode = OpCodes.Call;
instr.Operand = proxy.Item2;
return;
}
}
else
proxy = new Tuple<FieldDef, MethodDef>(null, null);
MethodSig sig = CreateProxySignature(ctx, target, instr.OpCode.Code == Code.Newobj);
TypeDef delegateType = GetDelegateType(ctx, sig);
// Create proxy field
if (proxy.Item1 == null)
proxy = new Tuple<FieldDef, MethodDef>(
CreateField(ctx, delegateType),
proxy.Item2);
// Create proxy bridge
Debug.Assert(proxy.Item2 == null);
proxy = new Tuple<FieldDef, MethodDef>(
proxy.Item1,
CreateBridge(ctx, delegateType, proxy.Item1, sig));
fields[key] = proxy;
// Replace instruction
instr.OpCode = OpCodes.Call;
instr.Operand = proxy.Item2;
}