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'luaS_resize' can raise memory errors

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Roberto Ierusalimschy 2017-12-01 15:38:49 -02:00
parent 9d28b40152
commit 421e459684
1 changed files with 9 additions and 4 deletions
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13
lgc.c
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@ -1,5 +1,5 @@
/*
** $Id: lgc.c,v 2.239 2017/11/23 19:29:04 roberto Exp roberto $
** $Id: lgc.c,v 2.240 2017/11/30 15:37:16 roberto Exp roberto $
** Garbage Collector
** See Copyright Notice in lua.h
*/
@ -816,14 +816,19 @@ static GCObject **sweeptolive (lua_State *L, GCObject **p) {
*/
/*
** If possible, shrink string table
** If possible, shrink string table (protected from memory errors).
*/
static void shrinkstrtable (lua_State *L, void *ud) {
luaS_resize(L, *cast(int*, ud) / 2);
}
static void checkSizes (lua_State *L, global_State *g) {
if (!g->gcemergency) {
l_mem olddebt = g->GCdebt;
if (g->strt.nuse < g->strt.size / 4) /* string table too big? */
luaS_resize(L, g->strt.size / 2); /* shrink it a little */
g->GCestimate += g->GCdebt - olddebt; /* update estimate */
luaD_rawrunprotected(L, &shrinkstrtable, &g->strt.size);
g->GCestimate += g->GCdebt - olddebt; /* correct estimate */
}
}