Re: lua 5.3.2 introduced a bug related to coroutines
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- Subject: Re: lua 5.3.2 introduced a bug related to coroutines
- From: Roberto Ierusalimschy <roberto@...>
- Date: 2016年3月18日 08:20:19 -0300
> My first guess is that lstrlib.c:gmatch is storing the lua_State object (see
> prepstate) used when creating the closure. When the closure is invoked, it
> uses this original lua_State instead of the current lua_State invoking the
> closure. But the original lua_State is busy resuming the new lua_State.
>
> The immediate solution might be to add
>
> gm->ms.L = L
Seems right.
> to strlib.c:gmatch_aux. I haven't tested it. It might result in wrong error
> messages? Maybe not. I don't know why lua_State is being stored in
> MatchState except to reduce the number of arguments needed to invoke all the
> other routines in strlib.c.
That was the whole point of the original 'MatchState': to reduce the
number of arguments among the several routines in the regex engine. It
was then hijacked by 'gmatch', which created this bug.
-- Roberto