private bool CheckParameters(Il2CppMethodDefinition method, MethodAnalysis context, bool isInstance)
{
var actualArgs = new List <IAnalysedOperand>();
if (!isInstance)
{
actualArgs.Add(context.GetOperandInRegister("rcx") ?? context.GetOperandInRegister("xmm0"));
}
actualArgs.Add(context.GetOperandInRegister("rdx") ?? context.GetOperandInRegister("xmm1"));
actualArgs.Add(context.GetOperandInRegister("r8") ?? context.GetOperandInRegister("xmm2"));
actualArgs.Add(context.GetOperandInRegister("r9") ?? context.GetOperandInRegister("xmm3"));
foreach (var parameterData in method.Parameters !)
{
if (actualArgs.Count(a => a != null) == 0)
{
return(false);
}
var arg = actualArgs.RemoveAndReturn(0);
switch (arg)
{
case ConstantDefinition cons when cons.Type.FullName != parameterData.Type.ToString(): //Constant type mismatch
case LocalDefinition local when !Utils.IsManagedTypeAnInstanceOfCppOne(parameterData.Type, local.Type !): //Local type mismatch
return(false);
}
}
if (actualArgs.Any(a => a != null && !context.IsEmptyRegArg(a)))
{
return(false); //Left over args - it's probably not this one
}
return(true);
}
public static int GetMethodIndexFromMethod(Il2CppMethodDefinition methodDefinition)
{
if (LibCpp2IlMain.TheMetadata == null)
{
return(-1);
}
for (var i = 0; i < LibCpp2IlMain.TheMetadata.methodDefs.Length; i++)
{
if (LibCpp2IlMain.TheMetadata.methodDefs[i] == methodDefinition)
{
return(i);
}
}
return(-1);
}
public CallManagedFunctionAction(MethodAnalysis context, Instruction instruction) : base(context, instruction)
{
var jumpTarget = instruction.NearBranchTarget;
var objectMethodBeingCalledOn = context.GetLocalInReg("rcx");
var listOfCallableMethods = LibCpp2IlMain.GetManagedMethodImplementationsAtAddress(jumpTarget);
if (listOfCallableMethods == null)
{
return;
}
Il2CppMethodDefinition possibleTarget = null;
if (objectMethodBeingCalledOn?.Type != null)
{
//Direct instance methods take priority
possibleTarget = listOfCallableMethods.FirstOrDefault(m => !m.IsStatic && Utils.AreManagedAndCppTypesEqual(LibCpp2ILUtils.WrapType(m.DeclaringType !), objectMethodBeingCalledOn.Type) && CheckParameters(m, context, true));
//todo check args and null out
if (possibleTarget == null)
{
//Base class instance methods
possibleTarget = listOfCallableMethods.FirstOrDefault(m => !m.IsStatic && Utils.IsManagedTypeAnInstanceOfCppOne(LibCpp2ILUtils.WrapType(m.DeclaringType !), objectMethodBeingCalledOn.Type) && CheckParameters(m, context, true));
}
//check args again.
}
//Check static methods
if (possibleTarget == null)
{
possibleTarget = listOfCallableMethods.FirstOrDefault(m => m.IsStatic && CheckParameters(m, context, false));
}
if (possibleTarget != null)
{
target = SharedState.UnmanagedToManagedMethods[possibleTarget];
return;
}
// SharedState.MethodsByAddress.TryGetValue(jumpTarget, out target);
}
private static string GetModifiers(Il2CppMethodDefinition methodDef)
{
if (methodModifiers.TryGetValue(methodDef, out string str))
{
return(str);
}
var access = methodDef.flags & METHOD_ATTRIBUTE_MEMBER_ACCESS_MASK;
switch (access)
{
case METHOD_ATTRIBUTE_PRIVATE:
str += "private ";
break;
case METHOD_ATTRIBUTE_PUBLIC:
str += "public ";
break;
case METHOD_ATTRIBUTE_FAMILY:
str += "protected ";
break;
case METHOD_ATTRIBUTE_ASSEM:
case METHOD_ATTRIBUTE_FAM_AND_ASSEM:
str += "internal ";
break;
case METHOD_ATTRIBUTE_FAM_OR_ASSEM:
str += "protected internal ";
break;
}
if ((methodDef.flags & METHOD_ATTRIBUTE_STATIC) != 0)
{
str += "static ";
}
if ((methodDef.flags & METHOD_ATTRIBUTE_ABSTRACT) != 0)
{
str += "abstract ";
if ((methodDef.flags & METHOD_ATTRIBUTE_VTABLE_LAYOUT_MASK) == METHOD_ATTRIBUTE_REUSE_SLOT)
{
str += "override ";
}
}
else if ((methodDef.flags & METHOD_ATTRIBUTE_FINAL) != 0)
{
if ((methodDef.flags & METHOD_ATTRIBUTE_VTABLE_LAYOUT_MASK) == METHOD_ATTRIBUTE_REUSE_SLOT)
{
str += "sealed override ";
}
}
else if ((methodDef.flags & METHOD_ATTRIBUTE_VIRTUAL) != 0)
{
if ((methodDef.flags & METHOD_ATTRIBUTE_VTABLE_LAYOUT_MASK) == METHOD_ATTRIBUTE_NEW_SLOT)
{
str += "virtual ";
}
else
{
str += "override ";
}
}
if ((methodDef.flags & METHOD_ATTRIBUTE_PINVOKE_IMPL) != 0)
{
str += "extern ";
}
methodModifiers.Add(methodDef, str);
return(str);
}
