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);
}
public CallManagedFunctionInRegAction(MethodAnalysis context, Instruction instruction) : base(context, instruction)
{
var regName = Utils.GetRegisterNameNew(instruction.MemoryBase);
var operand = context.GetConstantInReg(regName);
_targetMethod = (MethodDefinition)operand.Value;
if (!_targetMethod.IsStatic)
{
_instanceCalledOn = context.GetLocalInReg("rcx");
if (_instanceCalledOn == null)
{
var cons = context.GetConstantInReg("rcx");
if (cons?.Value is NewSafeCastResult castResult)
{
_instanceCalledOn = castResult.original;
}
}
}
}
public CallVirtualMethodAction(MethodAnalysis context, Instruction instruction) : base(context, instruction)
{
var inReg = context.GetOperandInRegister(Utils.GetRegisterNameNew(instruction.MemoryBase));
if (!(inReg is ConstantDefinition cons) || !(cons.Value is Il2CppClassIdentifier klass))
{
return;
}
var classReadFrom = klass.backingType;
var readOffset = instruction.MemoryDisplacement;
Called = Utils.GetMethodFromReadKlassOffset((int)readOffset);
if (Called == null)
{
return;
}
CalledOn = context.GetLocalInReg("rcx");
}