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"barrier" for link prototype->cache changed to be consistent with

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GC behavior (link is cleared to preserve invariant)
This commit is contained in:
Roberto Ierusalimschy
2013-08-19 11:18:43 -03:00
parent 8e6b7ef9ab
commit 9eff921f8f
3 changed files with 8 additions and 33 deletions
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24
lgc.c
View File

@@ -1,5 +1,5 @@
/*
** $Id: lgc.c,v 2.145 2013/08/13 17:36:44 roberto Exp roberto $
** $Id: lgc.c,v 2.146 2013/08/16 18:55:49 roberto Exp roberto $
** Garbage Collector
** See Copyright Notice in lua.h
*/
@@ -171,28 +171,6 @@ void luaC_barrierback_ (lua_State *L, GCObject *o) {
}
/*
** barrier for prototypes. When creating first closure (cache is
** NULL), use a forward barrier; this may be the only closure of the
** prototype (if it is a "regular" function, with a single instance)
** and the prototype may be big, so it is better to avoid traversing
** it again. Otherwise, use a backward barrier, to avoid marking all
** possible instances.
*/
LUAI_FUNC void luaC_barrierproto_ (lua_State *L, Proto *p, Closure *c) {
global_State *g = G(L);
lua_assert(isblack(obj2gco(p)));
if (p->cache == NULL) { /* first time? */
luaC_objbarrier(L, p, c);
}
else { /* use a backward barrier */
black2gray(obj2gco(p)); /* make prototype gray (again) */
p->gclist = g->grayagain;
g->grayagain = obj2gco(p);
}
}
/*
** check color (and invariants) for an upvalue that is being closed,
** i.e., moved into the 'allgc' list

5
lgc.h
View File

@@ -1,5 +1,5 @@
/*
** $Id: lgc.h,v 2.60 2013/08/13 17:36:44 roberto Exp roberto $
** $Id: lgc.h,v 2.61 2013/08/16 18:55:49 roberto Exp roberto $
** Garbage Collector
** See Copyright Notice in lua.h
*/
@@ -128,9 +128,6 @@
{ if (nolocal(obj2gco(o)), isblack(obj2gco(p)) && iswhite(obj2gco(o))) \
luaC_barrierback_(L,p); }
#define luaC_barrierproto(L,p,c) \
{ if (nolocal(obj2gco(c)), isblack(obj2gco(p))) luaC_barrierproto_(L,p,c); }
LUAI_FUNC void luaC_freeallobjects (lua_State *L);
LUAI_FUNC void luaC_step (lua_State *L);
LUAI_FUNC void luaC_forcestep (lua_State *L);

12
lvm.c
View File

@@ -1,5 +1,5 @@
/*
** $Id: lvm.c,v 2.176 2013/07/10 17:15:12 roberto Exp roberto $
** $Id: lvm.c,v 2.177 2013/08/16 18:55:49 roberto Exp roberto $
** Lua virtual machine
** See Copyright Notice in lua.h
*/
@@ -399,9 +399,9 @@ static Closure *getcached (Proto *p, UpVal **encup, StkId base) {
/*
** create a new Lua closure, push it in the stack, and initialize
** its upvalues. Note that the call to 'luaC_barrierproto' must come
** before the assignment to 'p->cache', as the function needs the
** original value of that field.
** its upvalues. Note that the closure is not cached if prototype is
** already black (which means that 'cache' was already cleared by the
** GC).
*/
static void pushclosure (lua_State *L, Proto *p, UpVal **encup, StkId base,
StkId ra) {
@@ -418,8 +418,8 @@ static void pushclosure (lua_State *L, Proto *p, UpVal **encup, StkId base,
ncl->l.upvals[i] = encup[uv[i].idx];
/* new closure is white and local, so we do not need a barrier here */
}
luaC_barrierproto(L, p, ncl);
p->cache = ncl; /* save it on cache for reuse */
if (!isblack(obj2gco(p))) /* cache will not break GC invariant? */
p->cache = ncl; /* save it on cache for reuse */
}