I getting EXC_BAD_ACCESS in virtual methods when i run program on iPad.
It happens only if method returns registered data type and if method have virtual definition in base class.

My code:

[source lang="cpp"]
virtual my_type Base::method() = 0;

...

my_type Derived::method()
{
...
this->field = 10; // EXC_BAD_ACCESS
...
}
[/source]

If i replace code above with:
[source lang="cpp"]
virtual void Base::method(my_type &res) = 0;

...

void Derived::method(my_type &res)
{
...
this->field = 10; // OK
...
}
[/source]
problem will disappear.

I have this problem only on ios device. i've tested my code on windows, osx and iphone simulator - all is ok. If i replace 'my_type' to 'int' all is ok as well.

It looks like calling of virtual methods with wrong object.

So, what it can be?

ps: as version - 2.25.0

Can you show the code where you register my_type with the script engine, as well as the registration code for this method?

Of course.


Method:
[source lang="cpp"]int r = engine->RegisterObjectMethod("Derived", "my_type method()",
asSMethodPtr<sizeof(void (Derived::*)())>::Convert(&Derived::method),
asCALL_THISCALL);
assert(r >= 0);[/source]

Type:
[source lang="cpp"]int r = engine->RegisterObjectType("my_type", sizeof(my_type), asOBJ_VALUE | asOBJ_APP_CLASS_CDAK);
assert(r >= 0);

r = engine->RegisterObjectBehaviour("my_type", asBEHAVE_CONSTRUCT, "void f()", asFUNCTION(__construct<my_type>), asCALL_CDECL_OBJLAST);
assert(r >= 0);
r = engine->RegisterObjectBehaviour("my_type", asBEHAVE_CONSTRUCT, "void f(const my_type &in)", asFUNCTION(__construct_copy<my_type>),asCALL_CDECL_OBJLAST);
assert(r >= 0);
r = engine->RegisterObjectBehaviour("my_type", asBEHAVE_DESTRUCT, "void f()", asFUNCTION(__destruct<my_type>), asCALL_CDECL_OBJLAST);
assert(r >= 0);

r = engine->RegisterObjectMethod("my_type", "my_type& opAssign(my_type &in)",
asSMethodPtr<sizeof(my_type& (my_type::*)(const my_type&))>::Convert((my_type& (my_type::*)(const my_type&))(&my_type::operator=)),
asCALL_THISCALL);
assert(r >= 0);[/source]

I'm not familiar with asSMethodPtr, so I don't know if you have a specific reason for using it, but why not use the asMETHODPR macro?


r = engine->RegisterObjectMethod("my_type", "my_type& opAssign(my_type &in)", asMETHODPR(my_type, operator=, (const my_type&), my_type&), asCALL_THISCALL);


It's probably not the problem, but pointers to member functions are tricky and the macros do some extra magic under the hood.

It not helps. asMETHODPR is wrapper around asSMethodPtr.
I'm still getting crashes when use virtual and pure-virtual methods.

I guess it is memory corruption in arm implementation of angel script. After call of any virtual method which returns my type crash occurs. It occurs either in method itself or further in code.

I'll review the code to see if I can spot the error. I may need some help from you to run some tests for me in order to have this fixed.

I sent PM to you.

Yes, everything works now. Huge thanks!