Re: Table crash on callback

["Wesley Smith" <wesley.hoke@...>]

Sorry about the syntax, I was recoding short examples in email.  I was
actually doing

function collisionDetection(data, o1, o2)
    strings[ tostring(o1) ] = true
end


Indeed I finally figured out how to get GDB running with this thing.
I have an app hosting Lua which loads a Lua.framework and the luaODE
module.

This is where I get the bad access error:
Line 425 from ltable.c
gkey(mp)->value = key->value; gkey(mp)->tt = key->tt;

When the debugger breaks on the bad access, it show all of the
variables being out of scope.

The C function looks like this:

static void nearCallback(void *Lua, dGeomID o1, dGeomID o2)
{
	lua_State *L = (lua_State *)Lua;
	
	int top = lua_gettop(L);
	if(!lua_isfunction(L, top))
		luaL_error(L, " nearCallback has no function to call for collision");

	//function gets popped after it's called, if the callback gets called
	//more than once, it will be gone, so each time it is called, put
	//a copy on the top of the stack
	lua_pushvalue(L, -1);
	lua_getfield(L, LUA_REGISTRYINDEX, LUA_ODE_REGISTRY_CALLBACK_DATA);
	udata<dGeomID>::udata_push(L, o1);
	udata<dGeomID>::udata_push(L, o2);
	lua_call(L, 3, 0);
}


The crash happens on the very first call into this function.  I'm not
sure where to go from here.

thanks,
wes