debuglocals([level [, skipFunctionsAndUserdata]]) returns the locals and
then the upvalues of a call level as text, one name=value line each.
It runs only while an error handler runs, as in 4.3.4. 1.12.1's error
function sets no flag for that, but while a handler runs that function
(FUN_FRAMESCRIPT_CALL_ERROR_HANDLER) is a C closure level on the stack;
ErrorCallstack's search for it moves into a header so both modules use
it. level counts as lua_getstack and debugstack do.
Each local comes from lua_getlocal (0x6FBB20, fastcall L/ar + n), then
each upvalue of the level's function (lua_getinfo "f") from
lua_getupvalue (0x6F4660, fastcall L/funcindex + n). Values are
formatted as 4.3.4's FrameScript_PackVariable does, with retail's
spacing (probed: n=7, s="hi", t=<table>{ / k=1 / }): a frame table shows
its name, read from t[0] as FrameScript_GetObject does; a table's fields
show one space in at the top level only; a function shows where it is
defined (lua_getinfo ">nS"). The text stops at 4095 bytes. The second
argument, which retail's error handler passes as true, leaves out
function and userdata values.
Where 4.3.4 would fail inside the handler, this does not: a number key
outside int range is formatted from a copy, not converted in place
(which breaks lua_next), and a key that is not a number or string prints
as its type.
Retail also lists (*temporary) lines, 5.1's names for a level's stack
slots past its locals, including a C level's arguments. 1.12.1's
lua_getlocal is 5.0's and names declared locals only; those slots are
compiler registers that 5.0 and 5.1 allocate differently, so they are
not imitated.
The error window takes the locals as retail's GetErrorData does,
debuglocals(level, true) at the stack's level, and shows them under
Locals ("<none>" when there are none).
LuaCAPI.md had lua_pushupvalues, lua_getupvalue and aux_upvalue one row
off; corrected.
C_UnitAuras.GetAuraSlots / GetAuraDataBySlot / UnitAuraBySlot: enumerate a
unit's auras once into opaque slot ids and fetch each by id, so a full scan
walks the aura array once instead of once per index (the by-index getters
re-walk from slot 0 on every call). Slot ids cover live descriptor slots,
the stealth / range cache fallback, and the out-of-range group array, so
the slot path keeps every source the by-index path had.
GetAuraSlots also takes a table as a 5th argument (ClassicAPI extension)
and fills it in place, returning `continuationToken, n`. Lua 5.0 allocates
an `arg` table for EVERY vararg call (luaD_precall 0x006F6050 ->
adjust_varargs 0x006F6200 -> luaH_new, verified in Ghidra), so a Lua helper
receiving the retail multi-return costs one table per batch. The fill form
keeps per-frame scans allocation-free; AuraUtil.ForEachAura / FindAura use
it with a per-nesting-depth buffer pool instead of retail's vararg helpers.
The descriptor walkers (FindNthSlot, FindSlotBySpellID/Name, GetUnitAuras)
now evaluate IsPlayerCast only when the filter restricts on caster. It
scans the Aura::Source cache (~1000 entries in a raid) and was paid for
every populated slot on every call, PLAYER token or not.
Cache-fallback eligibility is centralized (EligibleFallbacks /
EligibleGroupFallbacks) so the by-index, bulk, and by-slot paths share one
ordering, which is the ordinal an opaque cache slot id encodes.
Re-registers the standard five entries (create / resume / yield /
status / wrap) on the global `coroutine` table. The C-level
machinery (lua_resume, lua_yield, lua_newthread, threads as tag 8)
was always linked into the engine; only the script-side library
was stripped from the registration tables at build time.
Two WoW-specific quirks discovered along the way and worked
around:
- `lua_resume` returns 1 for BOTH yield and caught runtime error.
Disambiguated by checking `co->ci > co->base_ci` — a yielded
coroutine still has its body frame on the call stack; an
errored one has been unwound to base_ci.
- The byte at L+0x31 is `allowhook` (saved/restored around
protected calls), not `L->status` as it initially looked.
Status reading is replaced by the ci comparison above.
Brues