Re: A generational GC question

[Roberto Ierusalimschy <roberto@...>]

> I meant the value pointed to by the up-value . This is the 5.3 code;
> 
> /*
> ** barrier for assignments to closed upvalues. Because upvalues are
> ** shared among closures, it is impossible to know the color of all
> ** closures pointing to it. So, we assume that the object being assigned
> ** must be marked.
> */
> void luaC_upvalbarrier_ (lua_State *L, UpVal *uv) {
>   global_State *g = G(L);
>   GCObject *o = gcvalue(uv->v);
>   lua_assert(!upisopen(uv));  /* ensured by macro luaC_upvalbarrier */
>   if (keepinvariant(g))
>     markobject(g, o);
> }
> 
> My question is what age to set 'o' to.
> In the early GC code I quoted, this was set to G_OLD0.

So, G_OLD0. Or there was something wrong with that early code?  The
comment explains this choice.

-- Roberto