int do_pcall_with_traceback(
lua_State * L,
int narg,
int nresults,
BOOL is_async /* Hackish. This may be too specific to lua-alchemy. */
)
{
/* WARNING: Panic alert! Use L*_FN checkers here! */
SPAM((
"do_pcall_with_traceback(): begin (%s)", (is_async) ? "async" : "sync"
));
LCALL_ARGS(L, stack, 1 + narg); /* The function itself with arguments */
int status = 0;
BOOL old_async = set_async_state(L, is_async);
lua_pushcfunction(L, db_errorfb); /* push traceback function */
lua_insert(L, LBASE(L, stack)); /* put it under chunk and args */
LCHECK_FN(L, stack, 1 + narg + 1, fatal_error);
SPAM(("do_pcall_with_traceback(): before call"));
status = lua_pcall(L, narg, nresults, LBASE(L, stack));
lua_remove(L, LBASE(L, stack)); /* remove traceback function */
set_async_state(L, old_async);
if (status != 0)
{
SPAM(("do_pcall_with_traceback(): after call ERROR"));
/* force a complete garbage collection in case of errors */
lua_gc(L, LUA_GCCOLLECT, 0);
LCHECK_FN(L, stack, 1, fatal_error);
}
else
{
SPAM(("do_pcall_with_traceback(): after call OK"));
if (nresults != LUA_MULTRET)
{
LCHECK_FN(L, stack, nresults, fatal_error);
}
}
SPAM(("do_pcall_with_traceback(): end"));
return status;
}
/*
* Create an ActionScript value from the lua stack starting
* at index start and ending at index end. If collapse_array == 1,
* an empty return will be transformed into AS3_Undefined() and a
* return of length 1 will just return the specific value.
* Otherwise an array is returned.
*/
AS3_Val create_as3_value_from_lua_stack(
lua_State * L,
int start,
int end,
BOOL collapse_array
)
{
/* WARNING: Panic alert! Use L*_FN checkers here! */
LCALL(L, stack);
AS3_Val ret;
SPAM(("create_as3_value_from_lua_stack(): begin"));
if (collapse_array == TRUE && start > end)
{
ret = AS3_Null();
}
else if (collapse_array == TRUE && start == end)
{
ret = get_as3_value_from_lua_stack(L, start);
}
else
{
int i;
ret = AS3_Array("");
for (i = start; i <= end; ++i)
{
AS3_Val value;
AS3_Val r;
/*SPAM(("create_as3_value_from_lua_stack() + 1 begin"));*/
value = get_as3_value_from_lua_stack(L, i);
r = AS3_CallTS("push", ret, "AS3ValType", value);
SAFE_RELEASE(r); /* Ignoring result */
SAFE_RELEASE(value);
/*SPAM(("create_as3_value_from_lua_stack() + 1 end"));*/
}
}
#ifdef DO_SPAM
SPAM(("create_as3_value_from_lua_stack(): end"));
AS3_Trace(
AS3_Call(
getQualifiedClassName_method, NULL, AS3_Array("AS3ValType", ret)
)
);
#endif /* DO_SPAM */
LCHECK_FN(L, stack, 0, fatal_error);
return ret;
}
/*
* Take the Lua stack item at index i and convert it into an
* ActionScript value.
*/
AS3_Val get_as3_value_from_lua_stack_type(lua_State * L, int i, int type)
{
/* WARNING: Panic alert! Use L*_FN checkers here! */
LCALL(L, stack);
AS3_Val value;
switch (type)
{
case LUA_TSTRING: /* strings */
{
size_t length = 0;
const char * str = lua_tolstring(L, i, &length);
if (str == NULL) /* NOTE: This is unreachable. Assert instead */
{
length = 6;
str = "(null)";
}
/* NOTE: Alchemy .5a truncates embedded zeroes in string
* regardless to the passed length
*/
value = AS3_StringN(str, length);
}
break;
case LUA_TBOOLEAN: /* booleans */
value = lua_toboolean(L, i) ? AS3_True() : AS3_False();
break;
case LUA_TNUMBER: /* numbers */
value = AS3_Number(lua_tonumber(L, i));
break;
case LUA_TNONE: /* fall through */
case LUA_TNIL: /* nil */
value = AS3_Null();
break;
case LUA_TUSERDATA: /* userdata */
{
void * userdata = lua_touserdata(L, i);
lua_getfield(L, LUA_REGISTRYINDEX, AS3LUA_METATABLE);
if (userdata == NULL || !lua_getmetatable(L, i))
{
lua_pop(L, 1); /* Pop AS3LUA_METATABLE */
value = as3_value_from_foreign_userdata(L, i);
}
else if (!lua_rawequal(L, -2, -1))
{
lua_pop(L, 2); /* Pop AS3LUA_METATABLE and userdata metatable */
value = as3_value_from_foreign_userdata(L, i);
}
else
{
lua_pop(L, 2); /* Pop AS3LUA_METATABLE and userdata metatable */
AS3LuaUserData * userdata = (AS3LuaUserData *)lua_touserdata(L, i);
value = userdata->value;
/*
* We just created one more reference to the AS3 value,
* as it still lives inside Lua.
* (And will probably be collected by GC.)
*/
AS3_Acquire(value);
}
}
break;
case LUA_TFUNCTION: /* function */
value = setup_callback(L, i);
break;
case LUA_TLIGHTUSERDATA: /* TODO: blackbox this type */
case LUA_TTABLE: /* TODO: deal with this type */
case LUA_TTHREAD: /* TODO: blackbox this type */
value = AS3_String(lua_typename(L, type));
break;
default: /* unreachable */
fatal_error("unknown Lua type");
break;
}
#ifdef DO_SPAM
SPAM(("get_as3_value_from_lua_stack(): end"));
AS3_Trace(
AS3_Call(
getQualifiedClassName_method, NULL, AS3_Array("AS3ValType", value)
)
);
#endif /* DO_SPAM */
LCHECK_FN(L, stack, 0, fatal_error);
return value;
}
/*
* Function used as a callback for all Lua functions passed through
* get_as3_value_from_lua_stack()
*/
AS3_Val as3_lua_callback(void * data, AS3_Val args)
{
/* WARNING: Panic alert! Use L*_FN checkers here! */
SPAM(("as3_lua_callback(): begin"));
AS3_Val res;
LuaFunctionCallbackData * func_data = (LuaFunctionCallbackData *) data;
int nargs = 0;
int status = 0;
int results_base = 0;
lua_State * L = func_data->L;
if (L == NULL)
{
/* TODO: Should we crash here?
fatal_error("state expired"); / * Does not return * /
*/
sztrace("as3_lua_callback: state expired");
return AS3_Undefined();
}
{ /* A new scope for LCALL to work (C89 conformance) */
LCALL(L, stack);
/* TODO: Cache that with lua_ref, it is faster */
lua_getfield(L, LUA_REGISTRYINDEX, AS3LUA_CALLBACKS);
/* TODO: Assert we have a table here */
lua_rawgeti(L, -1, func_data->ref); /* push stored function */
if (lua_istable(L, -1) == 0) /* Probably nil */
{
lua_pop(L, 1); /* Pop bad callback table */
LCHECK_FN(L, stack, 0, fatal_error);
fatal_error("function callback not found"); /* Does not return */
}
lua_rawgeti(L, -1, AS3LUA_CBFNINDEX); /* push stored callback function */
#ifdef DO_SPAM
{
SPAM(("as3_lua_callback(): AS3 arguments"));
AS3_Val a = AS3_CallS("join", args, AS3_Undefined());
AS3_Trace(a);
SAFE_RELEASE(a);
}
#endif /* DO_SPAM */
/* TODO: Assert we have Lua function (or other callable object) on the top of the stack */
LCHECK_FN(L, stack, 2 + 1, fatal_error);
nargs = push_as3_array_to_lua_stack(L, args); /* push arguments */
#ifdef DO_SPAM
/* TODO: Remove */
lua_pushcfunction(L, as3_trace);
dump_lua_stack(L, LBASE(L, stack) + 2 + 1);
lua_pushliteral(L, "ARGUMENTS");
lua_pushnumber(L, nargs);
lua_call(L, 3, 0);
#endif /* DO_SPAM */
LCHECK_FN(L, stack, 2 + 1 + nargs, fatal_error);
results_base = LBASE(L, stack) + 2;
status = do_pcall_with_traceback(L, nargs, LUA_MULTRET);
if (status != 0)
{
const char * msg = NULL;
LCHECK_FN(L, stack, 2 + 1, fatal_error); /* Tables and error message */
lua_remove(L, -2); /* Remove AS3LUA_CALLBACKS table */
lua_remove(L, -2); /* Remove holder table */
LCHECK_FN(L, stack, 1, fatal_error); /* Only error message */
/* Error message is on stack */
/* NOTE: It is not necessary string! If we want to preserve its type, see lua_DoString. */
if (lua_tostring(L, -1) == NULL)
{
lua_pop(L, 1);
lua_pushliteral(L, "(non-string)");
}
LCHECK_FN(L, stack, 1, fatal_error);
lua_pushliteral(L, "Error in Lua callback:\n");
lua_insert(L, -2);
LCHECK_FN(L, stack, 2, fatal_error);
lua_concat(L, 2);
LCHECK_FN(L, stack, 1, fatal_error);
sztrace((char *)lua_tostring(L, -1));
/* TODO: ?! */
/* lua_error(L); */
msg = lua_tostring(L, -1);
lua_pop(L, 1);
/*
fatal_error(msg); / * Does not return * /
*/
}
/* Process results */
#ifdef DO_SPAM
/* TODO: Remove */
/*
lua_pushcfunction(L, as3_trace);
lua_pushliteral(L, "STACK");
dump_lua_stack(L, results_base);
lua_call(L, 2, 0);
*/
#endif /* DO_SPAM */
res = create_as3_value_from_lua_stack(L, results_base + 1, LTOP(L, stack), TRUE);
#ifdef DO_SPAM
SPAM(("as3_lua_callback() result type"));
AS3_Trace(AS3_Call(getQualifiedClassName_method, NULL, AS3_Array("AS3ValType", res)));
#endif /* DO_SPAM */
lua_settop(L, LBASE(L, stack)); /* Cleanup results and two holder tables */
SPAM(("as3_lua_callback(): end"));
return res;
}
/* Unreachable */
}
