Re: Why set useless stack slice(above L->top) to nil during gc atomic phase ?

[Roberto Ierusalimschy <roberto@...>]

> Lua 5.2.4
> In lgc.c propagatemark -> traversestack, line 502-506,
> clear the slice in the range of [th->top + 1, th->stack + th->stacksize),
> What if don't clear not-marked stack slice ?

Sometimes Lua increates the stack pointer without filling the
corresponding slots (e.g., when entering a Lua funcion and then calling
a metamethod).  This step ensures that the entire stack always has valid
values, so that later gc cycles can always traverse the stack without
problems.

-- Roberto