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userdata with finalizers are kept in a separated list

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Roberto Ierusalimschy 2008-02-19 15:55:09 -03:00
parent fa19baab7f
commit e2b366c760
7 changed files with 187 additions and 147 deletions
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8
lapi.c
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@ -1,12 +1,10 @@
/* /*
** $Id: lapi.c,v 2.64 2008/02/12 13:34:12 roberto Exp roberto $ ** $Id: lapi.c,v 2.65 2008/02/14 16:02:58 roberto Exp roberto $
** Lua API ** Lua API
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
#include <assert.h>
#include <math.h>
#include <stdarg.h> #include <stdarg.h>
#include <string.h> #include <string.h>
@ -698,8 +696,10 @@ LUA_API int lua_setmetatable (lua_State *L, int objindex) {
} }
case LUA_TUSERDATA: { case LUA_TUSERDATA: {
uvalue(obj)->metatable = mt; uvalue(obj)->metatable = mt;
if (mt) if (mt) {
luaC_objbarrier(L, rawuvalue(obj), mt); luaC_objbarrier(L, rawuvalue(obj), mt);
luaC_checkfinalizer(L, rawuvalue(obj));
}
break; break;
} }
default: { default: {

237
lgc.c
View File

@ -1,5 +1,5 @@
/* /*
** $Id: lgc.c,v 2.42 2007/10/31 15:41:19 roberto Exp roberto $ ** $Id: lgc.c,v 2.43 2008/02/11 15:46:03 roberto Exp roberto $
** Garbage Collector ** Garbage Collector
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -29,24 +29,22 @@
#define GCFINALIZECOST 100 #define GCFINALIZECOST 100
#define maskmarks cast_byte(~(bitmask(BLACKBIT)|WHITEBITS)) #define maskcolors cast_byte(~(bitmask(BLACKBIT)|WHITEBITS))
#define makewhite(g,x) \ #define makewhite(g,x) \
((x)->gch.marked = cast_byte(((x)->gch.marked & maskmarks) | luaC_white(g))) (gch(x)->marked = cast_byte((gch(x)->marked & maskcolors) | luaC_white(g)))
#define white2gray(x) reset2bits((x)->gch.marked, WHITE0BIT, WHITE1BIT) #define white2gray(x) resetbits(gch(x)->marked, WHITEBITS)
#define black2gray(x) resetbit((x)->gch.marked, BLACKBIT) #define black2gray(x) resetbit(gch(x)->marked, BLACKBIT)
#define stringmark(s) reset2bits((s)->tsv.marked, WHITE0BIT, WHITE1BIT) #define stringmark(s) resetbits((s)->tsv.marked, WHITEBITS)
#define isfinalized(u) testbit((u)->marked, FINALIZEDBIT) #define isfinalized(u) testbit((u)->marked, FINALIZEDBIT)
#define markfinalized(u) l_setbit((u)->marked, FINALIZEDBIT)
#define markvalue(g,o) { checkconsistency(o); \ #define markvalue(g,o) { checkconsistency(o); \
if (iscollectable(o) && iswhite(gcvalue(o))) reallymarkobject(g,gcvalue(o)); } if (valiswhite(o)) reallymarkobject(g,gcvalue(o)); }
#define markobject(g,t) { if ((t) && iswhite(obj2gco(t))) \ #define markobject(g,t) { if ((t) && iswhite(obj2gco(t))) \
reallymarkobject(g, obj2gco(t)); } reallymarkobject(g, obj2gco(t)); }
@ -89,7 +87,7 @@ static int iscleared (const TValue *o, int iskey) {
static void reallymarkobject (global_State *g, GCObject *o) { static void reallymarkobject (global_State *g, GCObject *o) {
lua_assert(iswhite(o) && !isdead(g, o)); lua_assert(iswhite(o) && !isdead(g, o));
white2gray(o); white2gray(o);
switch (o->gch.tt) { switch (gch(o)->tt) {
case LUA_TSTRING: { case LUA_TSTRING: {
return; return;
} }
@ -113,7 +111,7 @@ static void reallymarkobject (global_State *g, GCObject *o) {
break; break;
} }
case LUA_TTABLE: { case LUA_TTABLE: {
linktable(gco2h(o), &g->gray); linktable(gco2t(o), &g->gray);
break; break;
} }
case LUA_TTHREAD: { case LUA_TTHREAD: {
@ -131,42 +129,30 @@ static void reallymarkobject (global_State *g, GCObject *o) {
} }
static void marktmu (global_State *g) { /* move 'dead' udata that need finalization to list 'tobefnz' */
GCObject *u = g->tmudata;
if (u) {
do {
u = u->gch.next;
makewhite(g, u); /* may be marked, if left from previous GC */
reallymarkobject(g, u);
} while (u != g->tmudata);
}
}
/* move `dead' udata that need finalization to list `tmudata' */
size_t luaC_separateudata (lua_State *L, int all) { size_t luaC_separateudata (lua_State *L, int all) {
global_State *g = G(L); global_State *g = G(L);
size_t deadmem = 0; size_t deadmem = 0;
GCObject **p = &g->mainthread->next; GCObject **p = &g->tmudata;
GCObject *curr; GCObject *curr;
while ((curr = *p) != NULL) { while ((curr = *p) != NULL) {
if (!(iswhite(curr) || all) || isfinalized(gco2u(curr))) lua_assert(ttisuserdata(gch(curr)) && !isfinalized(gco2u(curr)));
p = &curr->gch.next; /* don't bother with them */ lua_assert(testbit(gch(curr)->marked, SEPARATED));
else if (fasttm(L, gco2u(curr)->metatable, TM_GC) == NULL) { if (all) makewhite(g, curr); /* if 'all', collect all objects */
markfinalized(gco2u(curr)); /* don't need finalization */ if (!iswhite(curr)) /* not being collected? */
p = &curr->gch.next; p = &gch(curr)->next; /* don't bother with it */
} else {
else { /* must call its gc method */ l_setbit(gch(curr)->marked, FINALIZEDBIT); /* won't be finalized again */
reallymarkobject(g, curr); /* won't be collected now */
deadmem += sizeudata(gco2u(curr)); deadmem += sizeudata(gco2u(curr));
markfinalized(gco2u(curr)); *p = gch(curr)->next; /* remove 'curr' from 'tmudata' list */
*p = curr->gch.next; /* link 'curr' at the end of 'tobefnz' list */
/* link `curr' at the end of `tmudata' list */ if (g->tobefnz == NULL) /* list is empty? */
if (g->tmudata == NULL) /* list is empty? */ g->tobefnz = gch(curr)->next = curr; /* creates a circular list */
g->tmudata = curr->gch.next = curr; /* creates a circular list */
else { else {
curr->gch.next = g->tmudata->gch.next; gch(curr)->next = gch(g->tobefnz)->next;
g->tmudata->gch.next = curr; gch(g->tobefnz)->next = curr;
g->tmudata = curr; g->tobefnz = curr;
} }
} }
} }
@ -195,7 +181,7 @@ static int traverseephemeron (global_State *g, Table *h) {
int hasclears = 0; int hasclears = 0;
int i = h->sizearray; int i = h->sizearray;
while (i--) { /* mark array part (numeric keys are 'strong') */ while (i--) { /* mark array part (numeric keys are 'strong') */
if (iscollectable(&h->array[i]) && iswhite(gcvalue(&h->array[i]))) { if (valiswhite(&h->array[i])) {
marked = 1; marked = 1;
reallymarkobject(g, gcvalue(&h->array[i])); reallymarkobject(g, gcvalue(&h->array[i]));
} }
@ -206,7 +192,7 @@ static int traverseephemeron (global_State *g, Table *h) {
lua_assert(ttype(gkey(n)) != LUA_TDEADKEY || ttisnil(gval(n))); lua_assert(ttype(gkey(n)) != LUA_TDEADKEY || ttisnil(gval(n)));
if (ttisnil(gval(n))) /* entry is empty? */ if (ttisnil(gval(n))) /* entry is empty? */
removeentry(n); /* remove it */ removeentry(n); /* remove it */
else if (iscollectable(gval(n)) && iswhite(gcvalue(gval(n)))) { else if (valiswhite(gval(n))) {
/* value is not marked yet */ /* value is not marked yet */
if (iscleared(key2tval(n), 1)) /* key is not marked (yet)? */ if (iscleared(key2tval(n), 1)) /* key is not marked (yet)? */
hasclears = 1; /* may have to propagate mark from key to value */ hasclears = 1; /* may have to propagate mark from key to value */
@ -256,10 +242,8 @@ static void traversetable (global_State *g, Table *h) {
traverseweakvalue(g, h); traverseweakvalue(g, h);
else if (!weakvalue) /* strong values? */ else if (!weakvalue) /* strong values? */
traverseephemeron(g, h); traverseephemeron(g, h);
else { else
lua_assert(weakkey && weakvalue); /* nothing to traverse now */ linktable(h, &g->allweak); /* nothing to traverse now */
linktable(h, &g->allweak);
}
return; return;
} /* else go through */ } /* else go through */
} }
@ -350,9 +334,9 @@ static l_mem propagatemark (global_State *g) {
GCObject *o = g->gray; GCObject *o = g->gray;
lua_assert(isgray(o)); lua_assert(isgray(o));
gray2black(o); gray2black(o);
switch (o->gch.tt) { switch (gch(o)->tt) {
case LUA_TTABLE: { case LUA_TTABLE: {
Table *h = gco2h(o); Table *h = gco2t(o);
g->gray = h->gclist; g->gray = h->gclist;
traversetable(g, h); traversetable(g, h);
return sizeof(Table) + sizeof(TValue) * h->sizearray + return sizeof(Table) + sizeof(TValue) * h->sizearray +
@ -406,8 +390,8 @@ static void convergeephemerons (global_State *g) {
g->ephemeron = NULL; g->ephemeron = NULL;
changed = 0; changed = 0;
while ((w = next) != NULL) { while ((w = next) != NULL) {
next = gco2h(w)->gclist; next = gco2t(w)->gclist;
if (traverseephemeron(g, gco2h(w))) { if (traverseephemeron(g, gco2t(w))) {
changed = 1; changed = 1;
propagateall(g); propagateall(g);
} }
@ -422,7 +406,7 @@ static void convergeephemerons (global_State *g) {
*/ */
static void cleartable (GCObject *l) { static void cleartable (GCObject *l) {
while (l) { while (l) {
Table *h = gco2h(l); Table *h = gco2t(l);
int i = h->sizearray; int i = h->sizearray;
while (i--) { while (i--) {
TValue *o = &h->array[i]; TValue *o = &h->array[i];
@ -444,25 +428,18 @@ static void cleartable (GCObject *l) {
static void freeobj (lua_State *L, GCObject *o) { static void freeobj (lua_State *L, GCObject *o) {
switch (o->gch.tt) { switch (gch(o)->tt) {
case LUA_TPROTO: luaF_freeproto(L, gco2p(o)); break; case LUA_TPROTO: luaF_freeproto(L, gco2p(o)); break;
case LUA_TFUNCTION: luaF_freeclosure(L, gco2cl(o)); break; case LUA_TFUNCTION: luaF_freeclosure(L, gco2cl(o)); break;
case LUA_TUPVAL: luaF_freeupval(L, gco2uv(o)); break; case LUA_TUPVAL: luaF_freeupval(L, gco2uv(o)); break;
case LUA_TTABLE: luaH_free(L, gco2h(o)); break; case LUA_TTABLE: luaH_free(L, gco2t(o)); break;
case LUA_TTHREAD: { case LUA_TTHREAD: luaE_freethread(L, gco2th(o)); break;
lua_assert(gco2th(o) != L && gco2th(o) != G(L)->mainthread); case LUA_TUSERDATA: luaM_freemem(L, o, sizeudata(gco2u(o))); break;
luaE_freethread(L, gco2th(o));
break;
}
case LUA_TSTRING: { case LUA_TSTRING: {
G(L)->strt.nuse--; G(L)->strt.nuse--;
luaM_freemem(L, o, sizestring(gco2ts(o))); luaM_freemem(L, o, sizestring(gco2ts(o)));
break; break;
} }
case LUA_TUSERDATA: {
luaM_freemem(L, o, sizeudata(gco2u(o)));
break;
}
default: lua_assert(0); default: lua_assert(0);
} }
} }
@ -477,18 +454,16 @@ static GCObject **sweeplist (lua_State *L, GCObject **p, lu_mem count) {
global_State *g = G(L); global_State *g = G(L);
int deadmask = otherwhite(g); int deadmask = otherwhite(g);
while ((curr = *p) != NULL && count-- > 0) { while ((curr = *p) != NULL && count-- > 0) {
if (curr->gch.tt == LUA_TTHREAD) /* sweep open upvalues of each thread */ if (ttisthread(gch(curr))) /* sweep open upvalues of each thread */
sweepwholelist(L, &gco2th(curr)->openupval); sweepwholelist(L, &gco2th(curr)->openupval);
if ((curr->gch.marked ^ WHITEBITS) & deadmask) { /* not dead? */ if ((gch(curr)->marked ^ WHITEBITS) & deadmask) { /* not dead? */
lua_assert(!isdead(g, curr) || testbit(curr->gch.marked, FIXEDBIT)); lua_assert(!isdead(g, curr) || testbit(gch(curr)->marked, FIXEDBIT));
makewhite(g, curr); /* make it white (for next cycle) */ makewhite(g, curr); /* make it white (for next cycle) */
p = &curr->gch.next; p = &gch(curr)->next;
} }
else { /* must erase `curr' */ else { /* must erase `curr' */
lua_assert(isdead(g, curr) || deadmask == bitmask(SFIXEDBIT)); lua_assert(isdead(g, curr) || deadmask == bitmask(SFIXEDBIT));
*p = curr->gch.next; *p = gch(curr)->next; /* remove 'curr' from list */
if (curr == g->rootgc) /* is the first element of the list? */
g->rootgc = curr->gch.next; /* adjust first */
freeobj(L, curr); freeobj(L, curr);
} }
} }
@ -496,6 +471,15 @@ static GCObject **sweeplist (lua_State *L, GCObject **p, lu_mem count) {
} }
static GCObject **unmarklist (global_State *g, GCObject **p, lu_mem count) {
for (; *p != NULL && count-- > 0; p = &gch(*p)->next) {
lua_assert(ttisuserdata(gch(*p)) && !isdead(g, *p));
makewhite(g, *p);
}
return p;
}
static void checkSizes (lua_State *L) { static void checkSizes (lua_State *L) {
global_State *g = G(L); global_State *g = G(L);
if (g->strt.nuse < cast(lu_int32, g->strt.size)) if (g->strt.nuse < cast(lu_int32, g->strt.size))
@ -505,15 +489,16 @@ static void checkSizes (lua_State *L) {
static Udata *udata2finalize (global_State *g) { static Udata *udata2finalize (global_State *g) {
GCObject *o = g->tmudata->gch.next; /* get first element */ GCObject *o = gch(g->tobefnz)->next; /* get first element */
Udata *udata = rawgco2u(o); Udata *udata = rawgco2u(o);
/* remove udata from `tmudata' */ /* remove udata from `tobefnz' */
if (o == g->tmudata) /* last element? */ if (o == g->tobefnz) /* last element? */
g->tmudata = NULL; g->tobefnz = NULL;
else else
g->tmudata->gch.next = udata->uv.next; gch(g->tobefnz)->next = udata->uv.next;
udata->uv.next = g->mainthread->next; /* return it to `root' list */ udata->uv.next = g->mainthread->next; /* return it to `root' list */
g->mainthread->next = o; g->mainthread->next = o;
resetbit(udata->uv.marked, SEPARATED); /* mark it as such */
makewhite(g, o); makewhite(g, o);
return udata; return udata;
} }
@ -522,8 +507,8 @@ static Udata *udata2finalize (global_State *g) {
static void GCTM (lua_State *L) { static void GCTM (lua_State *L) {
global_State *g = G(L); global_State *g = G(L);
Udata *udata = udata2finalize(g); Udata *udata = udata2finalize(g);
const TValue *tm = fasttm(L, udata->uv.metatable, TM_GC); const TValue *tm = gfasttm(g, udata->uv.metatable, TM_GC);
if (tm != NULL) { if (tm != NULL && ttisfunction(tm)) {
lu_byte oldah = L->allowhook; lu_byte oldah = L->allowhook;
lu_mem oldt = g->GCthreshold; lu_mem oldt = g->GCthreshold;
L->allowhook = 0; /* stop debug hooks during GC tag method */ L->allowhook = 0; /* stop debug hooks during GC tag method */
@ -543,15 +528,15 @@ static void GCTM (lua_State *L) {
*/ */
void luaC_callGCTM (lua_State *L) { void luaC_callGCTM (lua_State *L) {
global_State *g = G(L); global_State *g = G(L);
GCObject *last = g->tmudata; GCObject *last = g->tobefnz;
GCObject *curr; GCObject *curr;
if (last == NULL) return; /* empty list? */ if (last == NULL) return; /* empty list? */
do { do {
curr = g->tmudata->gch.next; /* element to be collected */ curr = gch(g->tobefnz)->next; /* element to be collected */
GCTM(L); GCTM(L);
} while (curr != last); /* go only until original last */ } while (curr != last); /* go only until original last */
/* do not finalize new udata created during previous finalizations */ /* do not finalize new udata created during previous finalizations */
while (g->tmudata) while (g->tobefnz)
udata2finalize(g); /* simply remove them from list */ udata2finalize(g); /* simply remove them from list */
} }
@ -559,10 +544,16 @@ void luaC_callGCTM (lua_State *L) {
void luaC_freeall (lua_State *L) { void luaC_freeall (lua_State *L) {
global_State *g = G(L); global_State *g = G(L);
int i; int i;
g->currentwhite = WHITEBITS | bitmask(SFIXEDBIT); /* mask to collect all elements */ lua_assert(g->tobefnz == NULL);
/* mask to collect all elements */
g->currentwhite = WHITEBITS | bitmask(SFIXEDBIT);
sweepwholelist(L, &g->rootgc); sweepwholelist(L, &g->rootgc);
lua_assert(g->rootgc == obj2gco(L));
sweepwholelist(L, &g->tmudata);
lua_assert(g->tmudata == NULL);
for (i = 0; i < g->strt.size; i++) /* free all string lists */ for (i = 0; i < g->strt.size; i++) /* free all string lists */
sweepwholelist(L, &g->strt.hash[i]); sweepwholelist(L, &g->strt.hash[i]);
lua_assert(g->strt.nuse == 0);
} }
@ -573,6 +564,20 @@ static void markmt (global_State *g) {
} }
static void markbeingfnz (global_State *g) {
GCObject *u = g->tobefnz;
if (u) {
do {
u = gch(u)->next;
lua_assert(testbit(gch(u)->marked, SEPARATED));
lua_assert(!iswhite(u)); /* must be marked, if left from previous GC */
makewhite(g, u);
reallymarkobject(g, u);
} while (u != g->tobefnz);
}
}
/* mark root set */ /* mark root set */
static void markroot (lua_State *L) { static void markroot (lua_State *L) {
global_State *g = G(L); global_State *g = G(L);
@ -584,6 +589,7 @@ static void markroot (lua_State *L) {
markvalue(g, gt(g->mainthread)); markvalue(g, gt(g->mainthread));
markvalue(g, registry(L)); markvalue(g, registry(L));
markmt(g); markmt(g);
markbeingfnz(g); /* mark any finalizing userdata left from previous cycle */
g->gcstate = GCSpropagate; g->gcstate = GCSpropagate;
} }
@ -598,6 +604,14 @@ static void remarkupvals (global_State *g) {
} }
static void marklistofgrays (global_State *g, GCObject **l) {
lua_assert(g->gray == NULL); /* no grays left */
g->gray = *l; /* now 'l' is new gray list */
*l = NULL;
propagateall(g);
}
static void atomic (lua_State *L) { static void atomic (lua_State *L) {
global_State *g = G(L); global_State *g = G(L);
size_t udsize; /* total size of userdata to be finalized */ size_t udsize; /* total size of userdata to be finalized */
@ -612,17 +626,10 @@ static void atomic (lua_State *L) {
markobject(g, L); /* mark running thread */ markobject(g, L); /* mark running thread */
markmt(g); /* mark basic metatables (again) */ markmt(g); /* mark basic metatables (again) */
propagateall(g); propagateall(g);
/* remark ephemeron tables */ marklistofgrays(g, &g->ephemeron); /* remark ephemeron tables */
g->gray = g->ephemeron; marklistofgrays(g, &g->grayagain); /* remark gray again */
g->ephemeron = NULL;
propagateall(g);
/* remark gray again */
g->gray = g->grayagain;
g->grayagain = NULL;
propagateall(g);
convergeephemerons(g); convergeephemerons(g);
udsize = luaC_separateudata(L, 0); /* separate userdata to be finalized */ udsize = luaC_separateudata(L, 0); /* separate userdata to be finalized */
marktmu(g); /* mark `preserved' userdata */
udsize += propagateall(g); /* remark, to propagate `preserveness' */ udsize += propagateall(g); /* remark, to propagate `preserveness' */
convergeephemerons(g); convergeephemerons(g);
/* remove collected objects from weak tables */ /* remove collected objects from weak tables */
@ -632,7 +639,6 @@ static void atomic (lua_State *L) {
/* flip current white */ /* flip current white */
g->currentwhite = cast_byte(otherwhite(g)); g->currentwhite = cast_byte(otherwhite(g));
g->sweepstrgc = 0; g->sweepstrgc = 0;
g->sweepgc = &g->rootgc;
g->gcstate = GCSsweepstring; g->gcstate = GCSsweepstring;
g->estimate = g->totalbytes - udsize; /* first estimate */ g->estimate = g->totalbytes - udsize; /* first estimate */
} }
@ -660,10 +666,20 @@ static l_mem singlestep (lua_State *L) {
} }
case GCSsweepstring: { case GCSsweepstring: {
correctestimate(g, sweepwholelist(L, &g->strt.hash[g->sweepstrgc++])); correctestimate(g, sweepwholelist(L, &g->strt.hash[g->sweepstrgc++]));
if (g->sweepstrgc >= g->strt.size) /* nothing more to sweep? */ if (g->sweepstrgc >= g->strt.size) { /* nothing more to sweep? */
g->gcstate = GCSsweep; /* end sweep-string phase */ g->sweepgc = &g->tmudata;
g->gcstate = GCSsweeptmu; /* end sweep-string phase */
}
return GCSWEEPCOST; return GCSWEEPCOST;
} }
case GCSsweeptmu: {
g->sweepgc = unmarklist(g, g->sweepgc, GCSWEEPMAX);
if (*g->sweepgc == NULL) { /* nothing more to sweep? */
g->sweepgc = &g->rootgc;
g->gcstate = GCSsweep; /* sweep all other objects */
}
return GCSWEEPMAX*GCSWEEPCOST;
}
case GCSsweep: { case GCSsweep: {
correctestimate(g, g->sweepgc = sweeplist(L, g->sweepgc, GCSWEEPMAX)); correctestimate(g, g->sweepgc = sweeplist(L, g->sweepgc, GCSWEEPMAX));
if (*g->sweepgc == NULL) /* nothing more to sweep? */ if (*g->sweepgc == NULL) /* nothing more to sweep? */
@ -671,7 +687,7 @@ static l_mem singlestep (lua_State *L) {
return GCSWEEPMAX*GCSWEEPCOST; return GCSWEEPMAX*GCSWEEPCOST;
} }
case GCSfinalize: { case GCSfinalize: {
if (g->tmudata) { if (g->tobefnz) {
GCTM(L); GCTM(L);
if (g->estimate > GCFINALIZECOST) if (g->estimate > GCFINALIZECOST)
g->estimate -= GCFINALIZECOST; g->estimate -= GCFINALIZECOST;
@ -721,19 +737,17 @@ void luaC_fullgc (lua_State *L, int isemergency) {
lua_assert(g->gckind == KGC_NORMAL); lua_assert(g->gckind == KGC_NORMAL);
g->gckind = isemergency ? KGC_EMERGENCY : KGC_FORCED; g->gckind = isemergency ? KGC_EMERGENCY : KGC_FORCED;
if (g->gcstate <= GCSpropagate) { if (g->gcstate <= GCSpropagate) {
/* reset sweep marks to sweep all elements (returning them to white) */
g->sweepstrgc = 0;
g->sweepgc = &g->rootgc;
/* reset other collector lists */ /* reset other collector lists */
g->gray = NULL; g->gray = NULL;
g->grayagain = NULL; g->grayagain = NULL;
g->weak = g->ephemeron = g->allweak = NULL; g->weak = g->ephemeron = g->allweak = NULL;
g->sweepstrgc = 0;
g->gcstate = GCSsweepstring; g->gcstate = GCSsweepstring;
} }
lua_assert(g->gcstate != GCSpause && g->gcstate != GCSpropagate); lua_assert(g->gcstate != GCSpause && g->gcstate != GCSpropagate);
/* finish any pending sweep phase */ /* finish any pending sweep phase */
while (g->gcstate != GCSfinalize) { while (g->gcstate != GCSfinalize) {
lua_assert(g->gcstate == GCSsweepstring || g->gcstate == GCSsweep); lua_assert(issweep(g));
singlestep(L); singlestep(L);
} }
markroot(L); markroot(L);
@ -753,7 +767,7 @@ void luaC_barrierf (lua_State *L, GCObject *o, GCObject *v) {
global_State *g = G(L); global_State *g = G(L);
lua_assert(isblack(o) && iswhite(v) && !isdead(g, v) && !isdead(g, o)); lua_assert(isblack(o) && iswhite(v) && !isdead(g, v) && !isdead(g, o));
lua_assert(g->gcstate != GCSfinalize && g->gcstate != GCSpause); lua_assert(g->gcstate != GCSfinalize && g->gcstate != GCSpause);
lua_assert(ttype(&o->gch) != LUA_TTABLE); lua_assert(ttype(gch(o)) != LUA_TTABLE);
/* must keep invariant? */ /* must keep invariant? */
if (g->gcstate == GCSpropagate) if (g->gcstate == GCSpropagate)
reallymarkobject(g, v); /* restore invariant */ reallymarkobject(g, v); /* restore invariant */
@ -775,17 +789,17 @@ void luaC_barrierback (lua_State *L, Table *t) {
void luaC_link (lua_State *L, GCObject *o, lu_byte tt) { void luaC_link (lua_State *L, GCObject *o, lu_byte tt) {
global_State *g = G(L); global_State *g = G(L);
o->gch.next = g->rootgc; gch(o)->marked = luaC_white(g);
gch(o)->tt = tt;
gch(o)->next = g->rootgc;
g->rootgc = o; g->rootgc = o;
o->gch.marked = luaC_white(g);
o->gch.tt = tt;
} }
void luaC_linkupval (lua_State *L, UpVal *uv) { void luaC_linkupval (lua_State *L, UpVal *uv) {
global_State *g = G(L); global_State *g = G(L);
GCObject *o = obj2gco(uv); GCObject *o = obj2gco(uv);
o->gch.next = g->rootgc; /* link upvalue into `rootgc' list */ gch(o)->next = g->rootgc; /* link upvalue into `rootgc' list */
g->rootgc = o; g->rootgc = o;
if (isgray(o)) { if (isgray(o)) {
if (g->gcstate == GCSpropagate) { if (g->gcstate == GCSpropagate) {
@ -799,3 +813,22 @@ void luaC_linkupval (lua_State *L, UpVal *uv) {
} }
} }
void luaC_checkfinalizer (lua_State *L, Udata *u) {
global_State *g = G(L);
if (testbit(u->uv.marked, SEPARATED) || /* userdata is already separated... */
isfinalized(&u->uv) || /* ... or is finalized... */
gfasttm(g, u->uv.metatable, TM_GC) == NULL) /* or has no finalization? */
return; /* nothing to be done */
else { /* move 'u' from root list to tobefnz list */
GCObject **p;
for (p = &g->rootgc; *p != obj2gco(u); p = &gch(*p)->next)
lua_assert(*p != NULL); /* 'u' must be in this list */
*p = u->uv.next; /* remove 'u' from root list */
u->uv.next = g->tmudata; /* link it in tobefnz list */
g->tmudata = obj2gco(u);
l_setbit(u->uv.marked, SEPARATED); /* mark it as such */
}
}

17
lgc.h
View File

@ -1,5 +1,5 @@
/* /*
** $Id: lgc.h,v 2.16 2006/07/11 15:53:29 roberto Exp roberto $ ** $Id: lgc.h,v 2.17 2007/10/29 16:51:20 roberto Exp roberto $
** Garbage Collector ** Garbage Collector
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -17,8 +17,13 @@
#define GCSpause 0 #define GCSpause 0
#define GCSpropagate 1 #define GCSpropagate 1
#define GCSsweepstring 2 #define GCSsweepstring 2
#define GCSsweep 3 #define GCSsweeptmu 3
#define GCSfinalize 4 #define GCSsweep 4
#define GCSfinalize 5
#define issweep(g) \
(GCSsweepstring <= (g)->gcstate && (g)->gcstate <= GCSsweep)
/* /*
@ -34,7 +39,6 @@
#define testbit(x,b) testbits(x, bitmask(b)) #define testbit(x,b) testbits(x, bitmask(b))
#define set2bits(x,b1,b2) setbits(x, (bit2mask(b1, b2))) #define set2bits(x,b1,b2) setbits(x, (bit2mask(b1, b2)))
#define reset2bits(x,b1,b2) resetbits(x, (bit2mask(b1, b2))) #define reset2bits(x,b1,b2) resetbits(x, (bit2mask(b1, b2)))
#define test2bits(x,b1,b2) testbits(x, (bit2mask(b1, b2)))
@ -44,6 +48,7 @@
** bit 1 - object is white (type 1) ** bit 1 - object is white (type 1)
** bit 2 - object is black ** bit 2 - object is black
** bit 3 - for userdata: has been finalized ** bit 3 - for userdata: has been finalized
** bit 4 - for userdata: it's not in rootgc list (it's in tmudata or tobefnz)
** bit 5 - object is fixed (should not be collected) ** bit 5 - object is fixed (should not be collected)
** bit 6 - object is "super" fixed (only the main thread) ** bit 6 - object is "super" fixed (only the main thread)
*/ */
@ -53,12 +58,13 @@
#define WHITE1BIT 1 #define WHITE1BIT 1
#define BLACKBIT 2 #define BLACKBIT 2
#define FINALIZEDBIT 3 #define FINALIZEDBIT 3
#define SEPARATED 4
#define FIXEDBIT 5 #define FIXEDBIT 5
#define SFIXEDBIT 6 #define SFIXEDBIT 6
#define WHITEBITS bit2mask(WHITE0BIT, WHITE1BIT) #define WHITEBITS bit2mask(WHITE0BIT, WHITE1BIT)
#define iswhite(x) test2bits((x)->gch.marked, WHITE0BIT, WHITE1BIT) #define iswhite(x) testbits((x)->gch.marked, WHITEBITS)
#define isblack(x) testbit((x)->gch.marked, BLACKBIT) #define isblack(x) testbit((x)->gch.marked, BLACKBIT)
#define isgray(x) (!isblack(x) && !iswhite(x)) #define isgray(x) (!isblack(x) && !iswhite(x))
@ -101,6 +107,7 @@ LUAI_FUNC void luaC_link (lua_State *L, GCObject *o, lu_byte tt);
LUAI_FUNC void luaC_linkupval (lua_State *L, UpVal *uv); LUAI_FUNC void luaC_linkupval (lua_State *L, UpVal *uv);
LUAI_FUNC void luaC_barrierf (lua_State *L, GCObject *o, GCObject *v); LUAI_FUNC void luaC_barrierf (lua_State *L, GCObject *o, GCObject *v);
LUAI_FUNC void luaC_barrierback (lua_State *L, Table *t); LUAI_FUNC void luaC_barrierback (lua_State *L, Table *t);
LUAI_FUNC void luaC_checkfinalizer (lua_State *L, Udata *u);
#endif #endif

11
lstate.c
View File

@ -1,5 +1,5 @@
/* /*
** $Id: lstate.c,v 2.42 2007/10/31 15:41:19 roberto Exp roberto $ ** $Id: lstate.c,v 2.43 2008/02/11 15:45:30 roberto Exp roberto $
** Global State ** Global State
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -107,8 +107,6 @@ static void close_state (lua_State *L) {
global_State *g = G(L); global_State *g = G(L);
luaF_close(L, L->stack); /* close all upvalues for this thread */ luaF_close(L, L->stack); /* close all upvalues for this thread */
luaC_freeall(L); /* collect all objects */ luaC_freeall(L); /* collect all objects */
lua_assert(g->rootgc == obj2gco(L));
lua_assert(g->strt.nuse == 0);
luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size, TString *); luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size, TString *);
luaZ_freebuffer(L, &g->buff); luaZ_freebuffer(L, &g->buff);
freestack(L, L); freestack(L, L);
@ -183,7 +181,7 @@ LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
g->gray = NULL; g->gray = NULL;
g->grayagain = NULL; g->grayagain = NULL;
g->weak = g->ephemeron = g->allweak = NULL; g->weak = g->ephemeron = g->allweak = NULL;
g->tmudata = NULL; g->tmudata = g->tobefnz = NULL;
g->totalbytes = sizeof(LG); g->totalbytes = sizeof(LG);
g->gcpause = LUAI_GCPAUSE; g->gcpause = LUAI_GCPAUSE;
g->gcstepmul = LUAI_GCMUL; g->gcstepmul = LUAI_GCMUL;
@ -210,14 +208,15 @@ LUA_API void lua_close (lua_State *L) {
L = G(L)->mainthread; /* only the main thread can be closed */ L = G(L)->mainthread; /* only the main thread can be closed */
lua_lock(L); lua_lock(L);
luaF_close(L, L->stack); /* close all upvalues for this thread */ luaF_close(L, L->stack); /* close all upvalues for this thread */
luaC_separateudata(L, 1); /* separate udata that have GC metamethods */ luaC_separateudata(L, 1); /* separate all udata with GC metamethods */
lua_assert(G(L)->tmudata == NULL);
L->errfunc = 0; /* no error function during GC metamethods */ L->errfunc = 0; /* no error function during GC metamethods */
do { /* repeat until no more errors */ do { /* repeat until no more errors */
L->ci = L->base_ci; L->ci = L->base_ci;
L->base = L->top = L->ci->base; L->base = L->top = L->ci->base;
G(L)->nCcalls = 0; G(L)->nCcalls = 0;
} while (luaD_rawrunprotected(L, callallgcTM, NULL) != LUA_OK); } while (luaD_rawrunprotected(L, callallgcTM, NULL) != LUA_OK);
lua_assert(G(L)->tmudata == NULL); lua_assert(G(L)->tobefnz == NULL);
luai_userstateclose(L); luai_userstateclose(L);
close_state(L); close_state(L);
} }

15
lstate.h
View File

@ -1,5 +1,5 @@
/* /*
** $Id: lstate.h,v 2.30 2007/10/31 15:41:19 roberto Exp roberto $ ** $Id: lstate.h,v 2.31 2008/02/11 15:45:30 roberto Exp roberto $
** Global State ** Global State
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -83,10 +83,11 @@ typedef struct global_State {
GCObject **sweepgc; /* position of sweep in `rootgc' */ GCObject **sweepgc; /* position of sweep in `rootgc' */
GCObject *gray; /* list of gray objects */ GCObject *gray; /* list of gray objects */
GCObject *grayagain; /* list of objects to be traversed atomically */ GCObject *grayagain; /* list of objects to be traversed atomically */
GCObject *weak; /* list of (something) weak tables */ GCObject *weak; /* list of tables with weak values */
GCObject *ephemeron; /* list of ephemeron tables */ GCObject *ephemeron; /* list of ephemeron tables (weak keys) */
GCObject *allweak; /* list of all-weak tables */ GCObject *allweak; /* list of all-weak tables */
GCObject *tmudata; /* last element of list of userdata to be GC */ GCObject *tmudata; /* list of userdata with finalizers */
GCObject *tobefnz; /* last element of list of userdata to be GC */
Mbuffer buff; /* temporary buffer for string concatentation */ Mbuffer buff; /* temporary buffer for string concatentation */
lu_mem GCthreshold; lu_mem GCthreshold;
lu_mem totalbytes; /* number of bytes currently allocated */ lu_mem totalbytes; /* number of bytes currently allocated */
@ -143,7 +144,7 @@ struct lua_State {
** Union of all collectable objects ** Union of all collectable objects
*/ */
union GCObject { union GCObject {
GCheader gch; GCheader gch; /* common header */
union TString ts; union TString ts;
union Udata u; union Udata u;
union Closure cl; union Closure cl;
@ -154,13 +155,15 @@ union GCObject {
}; };
#define gch(o) (&(o)->gch)
/* macros to convert a GCObject into a specific value */ /* macros to convert a GCObject into a specific value */
#define rawgco2ts(o) check_exp((o)->gch.tt == LUA_TSTRING, &((o)->ts)) #define rawgco2ts(o) check_exp((o)->gch.tt == LUA_TSTRING, &((o)->ts))
#define gco2ts(o) (&rawgco2ts(o)->tsv) #define gco2ts(o) (&rawgco2ts(o)->tsv)
#define rawgco2u(o) check_exp((o)->gch.tt == LUA_TUSERDATA, &((o)->u)) #define rawgco2u(o) check_exp((o)->gch.tt == LUA_TUSERDATA, &((o)->u))
#define gco2u(o) (&rawgco2u(o)->uv) #define gco2u(o) (&rawgco2u(o)->uv)
#define gco2cl(o) check_exp((o)->gch.tt == LUA_TFUNCTION, &((o)->cl)) #define gco2cl(o) check_exp((o)->gch.tt == LUA_TFUNCTION, &((o)->cl))
#define gco2h(o) check_exp((o)->gch.tt == LUA_TTABLE, &((o)->h)) #define gco2t(o) check_exp((o)->gch.tt == LUA_TTABLE, &((o)->h))
#define gco2p(o) check_exp((o)->gch.tt == LUA_TPROTO, &((o)->p)) #define gco2p(o) check_exp((o)->gch.tt == LUA_TPROTO, &((o)->p))
#define gco2uv(o) check_exp((o)->gch.tt == LUA_TUPVAL, &((o)->uv)) #define gco2uv(o) check_exp((o)->gch.tt == LUA_TUPVAL, &((o)->uv))
#define ngcotouv(o) check_exp((o)->gch.tt == LUA_TUPVAL, &((o)->uv)) #define ngcotouv(o) check_exp((o)->gch.tt == LUA_TUPVAL, &((o)->uv))

14
lstring.c
View File

@ -1,5 +1,5 @@
/* /*
** $Id: lstring.c,v 2.9 2006/07/11 15:53:29 roberto Exp roberto $ ** $Id: lstring.c,v 2.10 2007/11/09 18:55:07 roberto Exp roberto $
** String table (keeps all strings handled by Lua) ** String table (keeps all strings handled by Lua)
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -32,11 +32,11 @@ void luaS_resize (lua_State *L, int newsize) {
for (i=0; i<tb->size; i++) { for (i=0; i<tb->size; i++) {
GCObject *p = tb->hash[i]; GCObject *p = tb->hash[i];
while (p) { /* for each node in the list */ while (p) { /* for each node in the list */
GCObject *next = p->gch.next; /* save next */ GCObject *next = gch(p)->next; /* save next */
unsigned int h = gco2ts(p)->hash; unsigned int h = gco2ts(p)->hash;
int h1 = lmod(h, newsize); /* new position */ int h1 = lmod(h, newsize); /* new position */
lua_assert(cast_int(h%newsize) == lmod(h, newsize)); lua_assert(cast_int(h%newsize) == lmod(h, newsize));
p->gch.next = newhash[h1]; /* chain it */ gch(p)->next = newhash[h1]; /* chain it */
newhash[h1] = p; newhash[h1] = p;
p = next; p = next;
} }
@ -80,7 +80,7 @@ TString *luaS_newlstr (lua_State *L, const char *str, size_t l) {
h = h ^ ((h<<5)+(h>>2)+cast(unsigned char, str[l1-1])); h = h ^ ((h<<5)+(h>>2)+cast(unsigned char, str[l1-1]));
for (o = G(L)->strt.hash[lmod(h, G(L)->strt.size)]; for (o = G(L)->strt.hash[lmod(h, G(L)->strt.size)];
o != NULL; o != NULL;
o = o->gch.next) { o = gch(o)->next) {
TString *ts = rawgco2ts(o); TString *ts = rawgco2ts(o);
if (h == ts->tsv.hash && ts->tsv.len == l && if (h == ts->tsv.hash && ts->tsv.len == l &&
(memcmp(str, getstr(ts), l) == 0)) { (memcmp(str, getstr(ts), l) == 0)) {
@ -98,14 +98,10 @@ Udata *luaS_newudata (lua_State *L, size_t s, Table *e) {
if (s > MAX_SIZET - sizeof(Udata)) if (s > MAX_SIZET - sizeof(Udata))
luaM_toobig(L); luaM_toobig(L);
u = cast(Udata *, luaM_malloc(L, s + sizeof(Udata))); u = cast(Udata *, luaM_malloc(L, s + sizeof(Udata)));
u->uv.marked = luaC_white(G(L)); /* is not finalized */ luaC_link(L, obj2gco(u), LUA_TUSERDATA);
u->uv.tt = LUA_TUSERDATA;
u->uv.len = s; u->uv.len = s;
u->uv.metatable = NULL; u->uv.metatable = NULL;
u->uv.env = e; u->uv.env = e;
/* chain it on udata list (after main thread) */
u->uv.next = G(L)->mainthread->next;
G(L)->mainthread->next = obj2gco(u);
return u; return u;
} }

32
ltests.c
View File

@ -1,5 +1,5 @@
/* /*
** $Id: ltests.c,v 2.45 2008/02/11 18:04:26 roberto Exp roberto $ ** $Id: ltests.c,v 2.46 2008/02/11 19:04:16 roberto Exp roberto $
** Internal Module for Debugging of the Lua Implementation ** Internal Module for Debugging of the Lua Implementation
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -176,10 +176,10 @@ static int testobjref1 (global_State *g, GCObject *f, GCObject *t) {
static void printobj (global_State *g, GCObject *o) { static void printobj (global_State *g, GCObject *o) {
int i = 0; int i = 0;
GCObject *p; GCObject *p;
for (p = g->rootgc; p != o && p != NULL; p = p->gch.next) i++; for (p = g->rootgc; p != o && p != NULL; p = gch(p)->next) i++;
if (p == NULL) i = -1; if (p == NULL) i = -1;
printf("%d:%s(%p)-%c(%02X)", i, luaT_typenames[o->gch.tt], (void *)o, printf("%d:%s(%p)-%c(%02X)", i, luaT_typenames[gch(o)->tt], (void *)o,
isdead(g,o)?'d':isblack(o)?'b':iswhite(o)?'w':'g', o->gch.marked); isdead(g,o)?'d':isblack(o)?'b':iswhite(o)?'w':'g', gch(o)->marked);
} }
@ -198,7 +198,7 @@ static int testobjref (global_State *g, GCObject *f, GCObject *t) {
#define checkobjref(g,f,t) lua_assert(testobjref(g,f,obj2gco(t))) #define checkobjref(g,f,t) lua_assert(testobjref(g,f,obj2gco(t)))
#define checkvalref(g,f,t) lua_assert(!iscollectable(t) || \ #define checkvalref(g,f,t) lua_assert(!iscollectable(t) || \
((ttype(t) == (t)->value.gc->gch.tt) && testobjref(g,f,gcvalue(t)))) ((ttype(t) == gch((t)->value.gc)->tt) && testobjref(g,f,gcvalue(t))))
@ -285,7 +285,7 @@ static void checkstack (global_State *g, lua_State *L1) {
CallInfo *ci; CallInfo *ci;
GCObject *uvo; GCObject *uvo;
lua_assert(!isdead(g, obj2gco(L1))); lua_assert(!isdead(g, obj2gco(L1)));
for (uvo = L1->openupval; uvo != NULL; uvo = uvo->gch.next) { for (uvo = L1->openupval; uvo != NULL; uvo = gch(uvo)->next) {
UpVal *uv = gco2uv(uvo); UpVal *uv = gco2uv(uvo);
lua_assert(uv->v != &uv->u.value); /* must be open */ lua_assert(uv->v != &uv->u.value); /* must be open */
lua_assert(!isblack(uvo)); /* open upvalues cannot be black */ lua_assert(!isblack(uvo)); /* open upvalues cannot be black */
@ -308,14 +308,14 @@ static void checkstack (global_State *g, lua_State *L1) {
static void checkobject (global_State *g, GCObject *o) { static void checkobject (global_State *g, GCObject *o) {
if (isdead(g, o)) if (isdead(g, o))
/* lua_assert(g->gcstate == GCSsweepstring || g->gcstate == GCSsweep);*/ /* lua_assert(issweep(g));*/
{ if (!(g->gcstate == GCSsweepstring || g->gcstate == GCSsweep)) { if (!issweep(g))
printf(">>> %d %s %02x\n", g->gcstate, luaT_typenames[o->gch.tt], o->gch.marked); printf(">>> %d %s %02x\n", g->gcstate, luaT_typenames[gch(o)->tt], gch(o)->marked);
} }
else { else {
if (g->gcstate == GCSfinalize) if (g->gcstate == GCSfinalize)
lua_assert(iswhite(o)); lua_assert(iswhite(o));
switch (o->gch.tt) { switch (gch(o)->tt) {
case LUA_TUPVAL: { case LUA_TUPVAL: {
UpVal *uv = gco2uv(o); UpVal *uv = gco2uv(o);
lua_assert(uv->v == &uv->u.value); /* must be closed */ lua_assert(uv->v == &uv->u.value); /* must be closed */
@ -329,7 +329,7 @@ printf(">>> %d %s %02x\n", g->gcstate, luaT_typenames[o->gch.tt], o->gch.marke
break; break;
} }
case LUA_TTABLE: { case LUA_TTABLE: {
checktable(g, gco2h(o)); checktable(g, gco2t(o));
break; break;
} }
case LUA_TTHREAD: { case LUA_TTHREAD: {
@ -367,10 +367,10 @@ int lua_checkmemory (lua_State *L) {
GCObject *o; GCObject *o;
UpVal *uv; UpVal *uv;
checkstack(g, g->mainthread); checkstack(g, g->mainthread);
for (o = g->rootgc; o != obj2gco(g->mainthread); o = o->gch.next) for (o = g->rootgc; o != NULL; o = gch(o)->next)
checkobject(g, o); checkobject(g, o);
for (o = o->gch.next; o != NULL; o = o->gch.next) { for (o = g->tmudata; o != NULL; o = gch(o)->next) {
lua_assert(o->gch.tt == LUA_TUSERDATA); lua_assert(!isdead(g, o));
checkobject(g, o); checkobject(g, o);
} }
for (uv = g->uvhead.u.l.next; uv != &g->uvhead; uv = uv->u.l.next) { for (uv = g->uvhead.u.l.next; uv != &g->uvhead; uv = uv->u.l.next) {
@ -534,8 +534,10 @@ static int gcstate (lua_State *L) {
switch(G(L)->gcstate) { switch(G(L)->gcstate) {
case GCSpropagate: lua_pushstring(L, "propagate"); break; case GCSpropagate: lua_pushstring(L, "propagate"); break;
case GCSsweepstring: lua_pushstring(L, "sweep strings"); break; case GCSsweepstring: lua_pushstring(L, "sweep strings"); break;
case GCSsweeptmu: lua_pushstring(L, "sweep udata with __gc"); break;
case GCSsweep: lua_pushstring(L, "sweep"); break; case GCSsweep: lua_pushstring(L, "sweep"); break;
case GCSfinalize: lua_pushstring(L, "finalize"); break; case GCSfinalize: lua_pushstring(L, "finalize"); break;
default: lua_assert(0);
} }
return 1; return 1;
} }
@ -612,7 +614,7 @@ static int string_query (lua_State *L) {
else if (s < tb->size) { else if (s < tb->size) {
GCObject *ts; GCObject *ts;
int n = 0; int n = 0;
for (ts = tb->hash[s]; ts; ts = ts->gch.next) { for (ts = tb->hash[s]; ts; ts = gch(ts)->next) {
setsvalue2s(L, L->top, gco2ts(ts)); setsvalue2s(L, L->top, gco2ts(ts));
incr_top(L); incr_top(L);
n++; n++;