mirror of
https://github.com/lua/lua
synced 2024-11-22 12:51:30 +03:00
userdata with finalizers are kept in a separated list
This commit is contained in:
Roberto Ierusalimschy
parent
fa19baab7f
commit
e2b366c760
8
lapi.c
8
lapi.c
@ -1,12 +1,10 @@
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/*
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** $Id: lapi.c,v 2.64 2008/02/12 13:34:12 roberto Exp roberto $
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** $Id: lapi.c,v 2.65 2008/02/14 16:02:58 roberto Exp roberto $
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** Lua API
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** See Copyright Notice in lua.h
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*/
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#include <assert.h>
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#include <math.h>
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#include <stdarg.h>
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#include <string.h>
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@ -698,8 +696,10 @@ LUA_API int lua_setmetatable (lua_State *L, int objindex) {
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}
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case LUA_TUSERDATA: {
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uvalue(obj)->metatable = mt;
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if (mt)
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if (mt) {
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luaC_objbarrier(L, rawuvalue(obj), mt);
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luaC_checkfinalizer(L, rawuvalue(obj));
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}
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break;
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}
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default: {
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237
lgc.c
237
lgc.c
@ -1,5 +1,5 @@
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/*
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** $Id: lgc.c,v 2.42 2007/10/31 15:41:19 roberto Exp roberto $
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** $Id: lgc.c,v 2.43 2008/02/11 15:46:03 roberto Exp roberto $
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** Garbage Collector
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** See Copyright Notice in lua.h
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*/
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@ -29,24 +29,22 @@
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#define GCFINALIZECOST 100
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#define maskmarks cast_byte(~(bitmask(BLACKBIT)|WHITEBITS))
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#define maskcolors cast_byte(~(bitmask(BLACKBIT)|WHITEBITS))
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#define makewhite(g,x) \
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((x)->gch.marked = cast_byte(((x)->gch.marked & maskmarks) | luaC_white(g)))
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(gch(x)->marked = cast_byte((gch(x)->marked & maskcolors) | luaC_white(g)))
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#define white2gray(x) reset2bits((x)->gch.marked, WHITE0BIT, WHITE1BIT)
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#define black2gray(x) resetbit((x)->gch.marked, BLACKBIT)
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#define white2gray(x) resetbits(gch(x)->marked, WHITEBITS)
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#define black2gray(x) resetbit(gch(x)->marked, BLACKBIT)
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#define stringmark(s) reset2bits((s)->tsv.marked, WHITE0BIT, WHITE1BIT)
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#define stringmark(s) resetbits((s)->tsv.marked, WHITEBITS)
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#define isfinalized(u) testbit((u)->marked, FINALIZEDBIT)
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#define markfinalized(u) l_setbit((u)->marked, FINALIZEDBIT)
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#define markvalue(g,o) { checkconsistency(o); \
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if (iscollectable(o) && iswhite(gcvalue(o))) reallymarkobject(g,gcvalue(o)); }
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if (valiswhite(o)) reallymarkobject(g,gcvalue(o)); }
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#define markobject(g,t) { if ((t) && iswhite(obj2gco(t))) \
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reallymarkobject(g, obj2gco(t)); }
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@ -89,7 +87,7 @@ static int iscleared (const TValue *o, int iskey) {
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static void reallymarkobject (global_State *g, GCObject *o) {
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lua_assert(iswhite(o) && !isdead(g, o));
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white2gray(o);
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switch (o->gch.tt) {
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switch (gch(o)->tt) {
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case LUA_TSTRING: {
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return;
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}
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@ -113,7 +111,7 @@ static void reallymarkobject (global_State *g, GCObject *o) {
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break;
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}
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case LUA_TTABLE: {
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linktable(gco2h(o), &g->gray);
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linktable(gco2t(o), &g->gray);
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break;
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}
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case LUA_TTHREAD: {
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@ -131,42 +129,30 @@ static void reallymarkobject (global_State *g, GCObject *o) {
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}
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static void marktmu (global_State *g) {
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GCObject *u = g->tmudata;
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if (u) {
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do {
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u = u->gch.next;
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makewhite(g, u); /* may be marked, if left from previous GC */
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reallymarkobject(g, u);
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} while (u != g->tmudata);
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}
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}
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/* move `dead' udata that need finalization to list `tmudata' */
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/* move 'dead' udata that need finalization to list 'tobefnz' */
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size_t luaC_separateudata (lua_State *L, int all) {
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global_State *g = G(L);
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size_t deadmem = 0;
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GCObject **p = &g->mainthread->next;
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GCObject **p = &g->tmudata;
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GCObject *curr;
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while ((curr = *p) != NULL) {
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if (!(iswhite(curr) || all) || isfinalized(gco2u(curr)))
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p = &curr->gch.next; /* don't bother with them */
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else if (fasttm(L, gco2u(curr)->metatable, TM_GC) == NULL) {
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markfinalized(gco2u(curr)); /* don't need finalization */
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p = &curr->gch.next;
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}
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else { /* must call its gc method */
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lua_assert(ttisuserdata(gch(curr)) && !isfinalized(gco2u(curr)));
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lua_assert(testbit(gch(curr)->marked, SEPARATED));
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if (all) makewhite(g, curr); /* if 'all', collect all objects */
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if (!iswhite(curr)) /* not being collected? */
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p = &gch(curr)->next; /* don't bother with it */
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else {
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l_setbit(gch(curr)->marked, FINALIZEDBIT); /* won't be finalized again */
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reallymarkobject(g, curr); /* won't be collected now */
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deadmem += sizeudata(gco2u(curr));
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markfinalized(gco2u(curr));
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*p = curr->gch.next;
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/* link `curr' at the end of `tmudata' list */
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if (g->tmudata == NULL) /* list is empty? */
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g->tmudata = curr->gch.next = curr; /* creates a circular list */
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*p = gch(curr)->next; /* remove 'curr' from 'tmudata' list */
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/* link 'curr' at the end of 'tobefnz' list */
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if (g->tobefnz == NULL) /* list is empty? */
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g->tobefnz = gch(curr)->next = curr; /* creates a circular list */
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else {
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curr->gch.next = g->tmudata->gch.next;
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g->tmudata->gch.next = curr;
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g->tmudata = curr;
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gch(curr)->next = gch(g->tobefnz)->next;
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gch(g->tobefnz)->next = curr;
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g->tobefnz = curr;
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}
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}
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}
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@ -195,7 +181,7 @@ static int traverseephemeron (global_State *g, Table *h) {
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int hasclears = 0;
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int i = h->sizearray;
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while (i--) { /* mark array part (numeric keys are 'strong') */
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if (iscollectable(&h->array[i]) && iswhite(gcvalue(&h->array[i]))) {
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if (valiswhite(&h->array[i])) {
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marked = 1;
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reallymarkobject(g, gcvalue(&h->array[i]));
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}
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@ -206,7 +192,7 @@ static int traverseephemeron (global_State *g, Table *h) {
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lua_assert(ttype(gkey(n)) != LUA_TDEADKEY || ttisnil(gval(n)));
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if (ttisnil(gval(n))) /* entry is empty? */
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removeentry(n); /* remove it */
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else if (iscollectable(gval(n)) && iswhite(gcvalue(gval(n)))) {
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else if (valiswhite(gval(n))) {
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/* value is not marked yet */
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if (iscleared(key2tval(n), 1)) /* key is not marked (yet)? */
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hasclears = 1; /* may have to propagate mark from key to value */
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@ -256,10 +242,8 @@ static void traversetable (global_State *g, Table *h) {
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traverseweakvalue(g, h);
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else if (!weakvalue) /* strong values? */
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traverseephemeron(g, h);
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else {
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lua_assert(weakkey && weakvalue); /* nothing to traverse now */
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linktable(h, &g->allweak);
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}
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else
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linktable(h, &g->allweak); /* nothing to traverse now */
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return;
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} /* else go through */
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}
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@ -350,9 +334,9 @@ static l_mem propagatemark (global_State *g) {
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GCObject *o = g->gray;
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lua_assert(isgray(o));
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gray2black(o);
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switch (o->gch.tt) {
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switch (gch(o)->tt) {
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case LUA_TTABLE: {
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Table *h = gco2h(o);
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Table *h = gco2t(o);
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g->gray = h->gclist;
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traversetable(g, h);
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return sizeof(Table) + sizeof(TValue) * h->sizearray +
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@ -406,8 +390,8 @@ static void convergeephemerons (global_State *g) {
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g->ephemeron = NULL;
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changed = 0;
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while ((w = next) != NULL) {
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next = gco2h(w)->gclist;
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if (traverseephemeron(g, gco2h(w))) {
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next = gco2t(w)->gclist;
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if (traverseephemeron(g, gco2t(w))) {
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changed = 1;
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propagateall(g);
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}
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@ -422,7 +406,7 @@ static void convergeephemerons (global_State *g) {
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*/
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static void cleartable (GCObject *l) {
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while (l) {
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Table *h = gco2h(l);
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Table *h = gco2t(l);
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int i = h->sizearray;
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while (i--) {
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TValue *o = &h->array[i];
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@ -444,25 +428,18 @@ static void cleartable (GCObject *l) {
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static void freeobj (lua_State *L, GCObject *o) {
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switch (o->gch.tt) {
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switch (gch(o)->tt) {
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case LUA_TPROTO: luaF_freeproto(L, gco2p(o)); break;
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case LUA_TFUNCTION: luaF_freeclosure(L, gco2cl(o)); break;
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case LUA_TUPVAL: luaF_freeupval(L, gco2uv(o)); break;
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case LUA_TTABLE: luaH_free(L, gco2h(o)); break;
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case LUA_TTHREAD: {
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lua_assert(gco2th(o) != L && gco2th(o) != G(L)->mainthread);
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luaE_freethread(L, gco2th(o));
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break;
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}
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case LUA_TTABLE: luaH_free(L, gco2t(o)); break;
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case LUA_TTHREAD: luaE_freethread(L, gco2th(o)); break;
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case LUA_TUSERDATA: luaM_freemem(L, o, sizeudata(gco2u(o))); break;
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case LUA_TSTRING: {
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G(L)->strt.nuse--;
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luaM_freemem(L, o, sizestring(gco2ts(o)));
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break;
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}
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case LUA_TUSERDATA: {
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luaM_freemem(L, o, sizeudata(gco2u(o)));
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break;
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}
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default: lua_assert(0);
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}
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}
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@ -477,18 +454,16 @@ static GCObject **sweeplist (lua_State *L, GCObject **p, lu_mem count) {
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global_State *g = G(L);
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int deadmask = otherwhite(g);
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while ((curr = *p) != NULL && count-- > 0) {
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if (curr->gch.tt == LUA_TTHREAD) /* sweep open upvalues of each thread */
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if (ttisthread(gch(curr))) /* sweep open upvalues of each thread */
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sweepwholelist(L, &gco2th(curr)->openupval);
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if ((curr->gch.marked ^ WHITEBITS) & deadmask) { /* not dead? */
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lua_assert(!isdead(g, curr) || testbit(curr->gch.marked, FIXEDBIT));
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if ((gch(curr)->marked ^ WHITEBITS) & deadmask) { /* not dead? */
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lua_assert(!isdead(g, curr) || testbit(gch(curr)->marked, FIXEDBIT));
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makewhite(g, curr); /* make it white (for next cycle) */
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p = &curr->gch.next;
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p = &gch(curr)->next;
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}
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else { /* must erase `curr' */
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lua_assert(isdead(g, curr) || deadmask == bitmask(SFIXEDBIT));
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*p = curr->gch.next;
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if (curr == g->rootgc) /* is the first element of the list? */
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g->rootgc = curr->gch.next; /* adjust first */
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*p = gch(curr)->next; /* remove 'curr' from list */
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freeobj(L, curr);
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}
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}
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@ -496,6 +471,15 @@ static GCObject **sweeplist (lua_State *L, GCObject **p, lu_mem count) {
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}
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static GCObject **unmarklist (global_State *g, GCObject **p, lu_mem count) {
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for (; *p != NULL && count-- > 0; p = &gch(*p)->next) {
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lua_assert(ttisuserdata(gch(*p)) && !isdead(g, *p));
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makewhite(g, *p);
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}
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return p;
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}
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static void checkSizes (lua_State *L) {
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global_State *g = G(L);
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if (g->strt.nuse < cast(lu_int32, g->strt.size))
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@ -505,15 +489,16 @@ static void checkSizes (lua_State *L) {
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static Udata *udata2finalize (global_State *g) {
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GCObject *o = g->tmudata->gch.next; /* get first element */
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GCObject *o = gch(g->tobefnz)->next; /* get first element */
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Udata *udata = rawgco2u(o);
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/* remove udata from `tmudata' */
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if (o == g->tmudata) /* last element? */
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g->tmudata = NULL;
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/* remove udata from `tobefnz' */
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if (o == g->tobefnz) /* last element? */
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g->tobefnz = NULL;
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else
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g->tmudata->gch.next = udata->uv.next;
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gch(g->tobefnz)->next = udata->uv.next;
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udata->uv.next = g->mainthread->next; /* return it to `root' list */
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g->mainthread->next = o;
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resetbit(udata->uv.marked, SEPARATED); /* mark it as such */
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makewhite(g, o);
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return udata;
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}
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@ -522,8 +507,8 @@ static Udata *udata2finalize (global_State *g) {
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static void GCTM (lua_State *L) {
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global_State *g = G(L);
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Udata *udata = udata2finalize(g);
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const TValue *tm = fasttm(L, udata->uv.metatable, TM_GC);
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if (tm != NULL) {
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const TValue *tm = gfasttm(g, udata->uv.metatable, TM_GC);
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if (tm != NULL && ttisfunction(tm)) {
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lu_byte oldah = L->allowhook;
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lu_mem oldt = g->GCthreshold;
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L->allowhook = 0; /* stop debug hooks during GC tag method */
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@ -543,15 +528,15 @@ static void GCTM (lua_State *L) {
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*/
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void luaC_callGCTM (lua_State *L) {
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global_State *g = G(L);
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GCObject *last = g->tmudata;
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GCObject *last = g->tobefnz;
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GCObject *curr;
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if (last == NULL) return; /* empty list? */
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do {
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curr = g->tmudata->gch.next; /* element to be collected */
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curr = gch(g->tobefnz)->next; /* element to be collected */
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GCTM(L);
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} while (curr != last); /* go only until original last */
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/* do not finalize new udata created during previous finalizations */
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while (g->tmudata)
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while (g->tobefnz)
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udata2finalize(g); /* simply remove them from list */
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}
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@ -559,10 +544,16 @@ void luaC_callGCTM (lua_State *L) {
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void luaC_freeall (lua_State *L) {
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global_State *g = G(L);
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int i;
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g->currentwhite = WHITEBITS | bitmask(SFIXEDBIT); /* mask to collect all elements */
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lua_assert(g->tobefnz == NULL);
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/* mask to collect all elements */
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g->currentwhite = WHITEBITS | bitmask(SFIXEDBIT);
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sweepwholelist(L, &g->rootgc);
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lua_assert(g->rootgc == obj2gco(L));
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sweepwholelist(L, &g->tmudata);
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lua_assert(g->tmudata == NULL);
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for (i = 0; i < g->strt.size; i++) /* free all string lists */
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sweepwholelist(L, &g->strt.hash[i]);
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lua_assert(g->strt.nuse == 0);
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}
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@ -573,6 +564,20 @@ static void markmt (global_State *g) {
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}
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static void markbeingfnz (global_State *g) {
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GCObject *u = g->tobefnz;
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if (u) {
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do {
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u = gch(u)->next;
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lua_assert(testbit(gch(u)->marked, SEPARATED));
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lua_assert(!iswhite(u)); /* must be marked, if left from previous GC */
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makewhite(g, u);
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reallymarkobject(g, u);
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} while (u != g->tobefnz);
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}
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}
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/* mark root set */
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static void markroot (lua_State *L) {
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global_State *g = G(L);
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@ -584,6 +589,7 @@ static void markroot (lua_State *L) {
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markvalue(g, gt(g->mainthread));
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markvalue(g, registry(L));
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markmt(g);
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markbeingfnz(g); /* mark any finalizing userdata left from previous cycle */
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g->gcstate = GCSpropagate;
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}
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@ -598,6 +604,14 @@ static void remarkupvals (global_State *g) {
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}
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static void marklistofgrays (global_State *g, GCObject **l) {
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lua_assert(g->gray == NULL); /* no grays left */
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g->gray = *l; /* now 'l' is new gray list */
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*l = NULL;
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propagateall(g);
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}
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static void atomic (lua_State *L) {
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global_State *g = G(L);
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size_t udsize; /* total size of userdata to be finalized */
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@ -612,17 +626,10 @@ static void atomic (lua_State *L) {
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markobject(g, L); /* mark running thread */
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markmt(g); /* mark basic metatables (again) */
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||||
propagateall(g);
|
||||
/* remark ephemeron tables */
|
||||
g->gray = g->ephemeron;
|
||||
g->ephemeron = NULL;
|
||||
propagateall(g);
|
||||
/* remark gray again */
|
||||
g->gray = g->grayagain;
|
||||
g->grayagain = NULL;
|
||||
propagateall(g);
|
||||
marklistofgrays(g, &g->ephemeron); /* remark ephemeron tables */
|
||||
marklistofgrays(g, &g->grayagain); /* remark gray again */
|
||||
convergeephemerons(g);
|
||||
udsize = luaC_separateudata(L, 0); /* separate userdata to be finalized */
|
||||
marktmu(g); /* mark `preserved' userdata */
|
||||
udsize += propagateall(g); /* remark, to propagate `preserveness' */
|
||||
convergeephemerons(g);
|
||||
/* remove collected objects from weak tables */
|
||||
@ -632,7 +639,6 @@ static void atomic (lua_State *L) {
|
||||
/* flip current white */
|
||||
g->currentwhite = cast_byte(otherwhite(g));
|
||||
g->sweepstrgc = 0;
|
||||
g->sweepgc = &g->rootgc;
|
||||
g->gcstate = GCSsweepstring;
|
||||
g->estimate = g->totalbytes - udsize; /* first estimate */
|
||||
}
|
||||
@ -660,10 +666,20 @@ static l_mem singlestep (lua_State *L) {
|
||||
}
|
||||
case GCSsweepstring: {
|
||||
correctestimate(g, sweepwholelist(L, &g->strt.hash[g->sweepstrgc++]));
|
||||
if (g->sweepstrgc >= g->strt.size) /* nothing more to sweep? */
|
||||
g->gcstate = GCSsweep; /* end sweep-string phase */
|
||||
if (g->sweepstrgc >= g->strt.size) { /* nothing more to sweep? */
|
||||
g->sweepgc = &g->tmudata;
|
||||
g->gcstate = GCSsweeptmu; /* end sweep-string phase */
|
||||
}
|
||||
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: {
|
||||
correctestimate(g, g->sweepgc = sweeplist(L, g->sweepgc, GCSWEEPMAX));
|
||||
if (*g->sweepgc == NULL) /* nothing more to sweep? */
|
||||
@ -671,7 +687,7 @@ static l_mem singlestep (lua_State *L) {
|
||||
return GCSWEEPMAX*GCSWEEPCOST;
|
||||
}
|
||||
case GCSfinalize: {
|
||||
if (g->tmudata) {
|
||||
if (g->tobefnz) {
|
||||
GCTM(L);
|
||||
if (g->estimate > GCFINALIZECOST)
|
||||
g->estimate -= GCFINALIZECOST;
|
||||
@ -721,19 +737,17 @@ void luaC_fullgc (lua_State *L, int isemergency) {
|
||||
lua_assert(g->gckind == KGC_NORMAL);
|
||||
g->gckind = isemergency ? KGC_EMERGENCY : KGC_FORCED;
|
||||
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 */
|
||||
g->gray = NULL;
|
||||
g->grayagain = NULL;
|
||||
g->weak = g->ephemeron = g->allweak = NULL;
|
||||
g->sweepstrgc = 0;
|
||||
g->gcstate = GCSsweepstring;
|
||||
}
|
||||
lua_assert(g->gcstate != GCSpause && g->gcstate != GCSpropagate);
|
||||
/* finish any pending sweep phase */
|
||||
while (g->gcstate != GCSfinalize) {
|
||||
lua_assert(g->gcstate == GCSsweepstring || g->gcstate == GCSsweep);
|
||||
lua_assert(issweep(g));
|
||||
singlestep(L);
|
||||
}
|
||||
markroot(L);
|
||||
@ -753,7 +767,7 @@ void luaC_barrierf (lua_State *L, GCObject *o, GCObject *v) {
|
||||
global_State *g = G(L);
|
||||
lua_assert(isblack(o) && iswhite(v) && !isdead(g, v) && !isdead(g, o));
|
||||
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? */
|
||||
if (g->gcstate == GCSpropagate)
|
||||
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) {
|
||||
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;
|
||||
o->gch.marked = luaC_white(g);
|
||||
o->gch.tt = tt;
|
||||
}
|
||||
|
||||
|
||||
void luaC_linkupval (lua_State *L, UpVal *uv) {
|
||||
global_State *g = G(L);
|
||||
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;
|
||||
if (isgray(o)) {
|
||||
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
17
lgc.h
@ -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
|
||||
** See Copyright Notice in lua.h
|
||||
*/
|
||||
@ -17,8 +17,13 @@
|
||||
#define GCSpause 0
|
||||
#define GCSpropagate 1
|
||||
#define GCSsweepstring 2
|
||||
#define GCSsweep 3
|
||||
#define GCSfinalize 4
|
||||
#define GCSsweeptmu 3
|
||||
#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 set2bits(x,b1,b2) setbits(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 2 - object is black
|
||||
** 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 6 - object is "super" fixed (only the main thread)
|
||||
*/
|
||||
@ -53,12 +58,13 @@
|
||||
#define WHITE1BIT 1
|
||||
#define BLACKBIT 2
|
||||
#define FINALIZEDBIT 3
|
||||
#define SEPARATED 4
|
||||
#define FIXEDBIT 5
|
||||
#define SFIXEDBIT 6
|
||||
#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 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_barrierf (lua_State *L, GCObject *o, GCObject *v);
|
||||
LUAI_FUNC void luaC_barrierback (lua_State *L, Table *t);
|
||||
LUAI_FUNC void luaC_checkfinalizer (lua_State *L, Udata *u);
|
||||
|
||||
|
||||
#endif
|
||||
|
||||
11
lstate.c
11
lstate.c
@ -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
|
||||
** See Copyright Notice in lua.h
|
||||
*/
|
||||
@ -107,8 +107,6 @@ static void close_state (lua_State *L) {
|
||||
global_State *g = G(L);
|
||||
luaF_close(L, L->stack); /* close all upvalues for this thread */
|
||||
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 *);
|
||||
luaZ_freebuffer(L, &g->buff);
|
||||
freestack(L, L);
|
||||
@ -183,7 +181,7 @@ LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
|
||||
g->gray = NULL;
|
||||
g->grayagain = NULL;
|
||||
g->weak = g->ephemeron = g->allweak = NULL;
|
||||
g->tmudata = NULL;
|
||||
g->tmudata = g->tobefnz = NULL;
|
||||
g->totalbytes = sizeof(LG);
|
||||
g->gcpause = LUAI_GCPAUSE;
|
||||
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 */
|
||||
lua_lock(L);
|
||||
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 */
|
||||
do { /* repeat until no more errors */
|
||||
L->ci = L->base_ci;
|
||||
L->base = L->top = L->ci->base;
|
||||
G(L)->nCcalls = 0;
|
||||
} while (luaD_rawrunprotected(L, callallgcTM, NULL) != LUA_OK);
|
||||
lua_assert(G(L)->tmudata == NULL);
|
||||
lua_assert(G(L)->tobefnz == NULL);
|
||||
luai_userstateclose(L);
|
||||
close_state(L);
|
||||
}
|
||||
|
||||
15
lstate.h
15
lstate.h
@ -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
|
||||
** See Copyright Notice in lua.h
|
||||
*/
|
||||
@ -83,10 +83,11 @@ typedef struct global_State {
|
||||
GCObject **sweepgc; /* position of sweep in `rootgc' */
|
||||
GCObject *gray; /* list of gray objects */
|
||||
GCObject *grayagain; /* list of objects to be traversed atomically */
|
||||
GCObject *weak; /* list of (something) weak tables */
|
||||
GCObject *ephemeron; /* list of ephemeron tables */
|
||||
GCObject *weak; /* list of tables with weak values */
|
||||
GCObject *ephemeron; /* list of ephemeron tables (weak keys) */
|
||||
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 */
|
||||
lu_mem GCthreshold;
|
||||
lu_mem totalbytes; /* number of bytes currently allocated */
|
||||
@ -143,7 +144,7 @@ struct lua_State {
|
||||
** Union of all collectable objects
|
||||
*/
|
||||
union GCObject {
|
||||
GCheader gch;
|
||||
GCheader gch; /* common header */
|
||||
union TString ts;
|
||||
union Udata u;
|
||||
union Closure cl;
|
||||
@ -154,13 +155,15 @@ union GCObject {
|
||||
};
|
||||
|
||||
|
||||
#define gch(o) (&(o)->gch)
|
||||
|
||||
/* macros to convert a GCObject into a specific value */
|
||||
#define rawgco2ts(o) check_exp((o)->gch.tt == LUA_TSTRING, &((o)->ts))
|
||||
#define gco2ts(o) (&rawgco2ts(o)->tsv)
|
||||
#define rawgco2u(o) check_exp((o)->gch.tt == LUA_TUSERDATA, &((o)->u))
|
||||
#define gco2u(o) (&rawgco2u(o)->uv)
|
||||
#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 gco2uv(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
14
lstring.c
@ -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)
|
||||
** 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++) {
|
||||
GCObject *p = tb->hash[i];
|
||||
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;
|
||||
int h1 = lmod(h, newsize); /* new position */
|
||||
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;
|
||||
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]));
|
||||
for (o = G(L)->strt.hash[lmod(h, G(L)->strt.size)];
|
||||
o != NULL;
|
||||
o = o->gch.next) {
|
||||
o = gch(o)->next) {
|
||||
TString *ts = rawgco2ts(o);
|
||||
if (h == ts->tsv.hash && ts->tsv.len == l &&
|
||||
(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))
|
||||
luaM_toobig(L);
|
||||
u = cast(Udata *, luaM_malloc(L, s + sizeof(Udata)));
|
||||
u->uv.marked = luaC_white(G(L)); /* is not finalized */
|
||||
u->uv.tt = LUA_TUSERDATA;
|
||||
luaC_link(L, obj2gco(u), LUA_TUSERDATA);
|
||||
u->uv.len = s;
|
||||
u->uv.metatable = NULL;
|
||||
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;
|
||||
}
|
||||
|
||||
|
||||
32
ltests.c
32
ltests.c
@ -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
|
||||
** 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) {
|
||||
int i = 0;
|
||||
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;
|
||||
printf("%d:%s(%p)-%c(%02X)", i, luaT_typenames[o->gch.tt], (void *)o,
|
||||
isdead(g,o)?'d':isblack(o)?'b':iswhite(o)?'w':'g', o->gch.marked);
|
||||
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', 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 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;
|
||||
GCObject *uvo;
|
||||
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);
|
||||
lua_assert(uv->v != &uv->u.value); /* must be open */
|
||||
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) {
|
||||
if (isdead(g, o))
|
||||
/* lua_assert(g->gcstate == GCSsweepstring || g->gcstate == GCSsweep);*/
|
||||
{ if (!(g->gcstate == GCSsweepstring || g->gcstate == GCSsweep))
|
||||
printf(">>> %d %s %02x\n", g->gcstate, luaT_typenames[o->gch.tt], o->gch.marked);
|
||||
/* lua_assert(issweep(g));*/
|
||||
{ if (!issweep(g))
|
||||
printf(">>> %d %s %02x\n", g->gcstate, luaT_typenames[gch(o)->tt], gch(o)->marked);
|
||||
}
|
||||
else {
|
||||
if (g->gcstate == GCSfinalize)
|
||||
lua_assert(iswhite(o));
|
||||
switch (o->gch.tt) {
|
||||
switch (gch(o)->tt) {
|
||||
case LUA_TUPVAL: {
|
||||
UpVal *uv = gco2uv(o);
|
||||
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;
|
||||
}
|
||||
case LUA_TTABLE: {
|
||||
checktable(g, gco2h(o));
|
||||
checktable(g, gco2t(o));
|
||||
break;
|
||||
}
|
||||
case LUA_TTHREAD: {
|
||||
@ -367,10 +367,10 @@ int lua_checkmemory (lua_State *L) {
|
||||
GCObject *o;
|
||||
UpVal *uv;
|
||||
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);
|
||||
for (o = o->gch.next; o != NULL; o = o->gch.next) {
|
||||
lua_assert(o->gch.tt == LUA_TUSERDATA);
|
||||
for (o = g->tmudata; o != NULL; o = gch(o)->next) {
|
||||
lua_assert(!isdead(g, o));
|
||||
checkobject(g, o);
|
||||
}
|
||||
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) {
|
||||
case GCSpropagate: lua_pushstring(L, "propagate"); 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 GCSfinalize: lua_pushstring(L, "finalize"); break;
|
||||
default: lua_assert(0);
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
@ -612,7 +614,7 @@ static int string_query (lua_State *L) {
|
||||
else if (s < tb->size) {
|
||||
GCObject *ts;
|
||||
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));
|
||||
incr_top(L);
|
||||
n++;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user