mirror of
https://github.com/lua/lua
synced 2024-12-24 19:36:50 +03:00
new algorithm for traversing in GC to avoid deep recursion calls
This commit is contained in:
Roberto Ierusalimschy
parent
397905ef86
commit
d9e61e8cea
39
ldebug.c
39
ldebug.c
@ -1,5 +1,5 @@
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/*
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** $Id: ldebug.c,v 1.26 2000/06/30 14:29:35 roberto Exp roberto $
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** $Id: ldebug.c,v 1.27 2000/06/30 14:35:17 roberto Exp roberto $
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** Debug Interface
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** See Copyright Notice in lua.h
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*/
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@ -172,25 +172,38 @@ static void lua_funcinfo (lua_Debug *ar, StkId func) {
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}
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static int checkfunc (lua_State *L, TObject *o) {
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return luaO_equalObj(o, L->top);
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static const char *travtagmethods (lua_State *L, const TObject *o) {
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int e;
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for (e=0; e<IM_N; e++) {
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int t;
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for (t=0; t<=L->last_tag; t++)
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if (luaO_equalObj(o, luaT_getim(L, t,e)))
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return luaT_eventname[e];
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}
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return NULL;
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}
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static const char *travglobals (lua_State *L, const TObject *o) {
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Hash *g = L->gt;
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int i;
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for (i=0; i<=g->size; i++) {
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if (luaO_equalObj(o, val(node(g, i))) &&
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ttype(key(node(g, i))) == TAG_STRING)
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return tsvalue(key(node(g, i)))->str;
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}
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return NULL;
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}
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static void lua_getobjname (lua_State *L, StkId f, lua_Debug *ar) {
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Hash *g = L->gt;
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int i;
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TObject o;
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setnormalized(&o, f);
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/* try to find a name for given function */
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setnormalized(L->top, f); /* to be used by `checkfunc' */
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for (i=0; i<=g->size; i++) {
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if (ttype(key(node(g,i))) == TAG_STRING && checkfunc(L, val(node(g,i)))) {
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ar->name = tsvalue(key(node(g,i)))->str;
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if ((ar->name = travglobals(L, &o)) != NULL)
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ar->namewhat = "global";
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return;
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}
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}
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/* not found: try tag methods */
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if ((ar->name = luaT_travtagmethods(L, checkfunc)) != NULL)
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else if ((ar->name = travtagmethods(L, &o)) != NULL)
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ar->namewhat = "tag-method";
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else ar->namewhat = ""; /* not found at all */
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}
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4
lfunc.c
4
lfunc.c
@ -1,5 +1,5 @@
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/*
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** $Id: lfunc.c,v 1.24 2000/06/12 13:52:05 roberto Exp roberto $
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** $Id: lfunc.c,v 1.25 2000/06/26 19:28:31 roberto Exp roberto $
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** Auxiliary functions to manipulate prototypes and closures
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** See Copyright Notice in lua.h
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*/
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@ -25,7 +25,7 @@ Closure *luaF_newclosure (lua_State *L, int nelems) {
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(lint32)sizeof(TObject)*(nelems-1));
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c->next = L->rootcl;
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L->rootcl = c;
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c->marked = 0;
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c->mark = c;
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c->nupvalues = nelems;
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L->nblocks += gcsizeclosure(L, c);
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return c;
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154
lgc.c
154
lgc.c
@ -1,5 +1,5 @@
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/*
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** $Id: lgc.c,v 1.58 2000/06/26 19:28:31 roberto Exp roberto $
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** $Id: lgc.c,v 1.59 2000/06/30 14:35:17 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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@ -20,97 +20,94 @@
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#include "ltm.h"
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typedef struct GCState {
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Hash *tmark; /* list of marked tables to be visited */
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Closure *cmark; /* list of marked closures to be visited */
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} GCState;
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static int markobject (lua_State *L, TObject *o);
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static int markobject (GCState *st, TObject *o);
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/* mark a string; marks larger than 1 cannot be changed */
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#define strmark(L, s) {if ((s)->marked == 0) (s)->marked = 1;}
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#define strmark(s) {if ((s)->marked == 0) (s)->marked = 1;}
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static void protomark (lua_State *L, Proto *f) {
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static void protomark (Proto *f) {
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if (!f->marked) {
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int i;
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f->marked = 1;
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strmark(L, f->source);
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strmark(f->source);
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for (i=0; i<f->nkstr; i++)
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strmark(L, f->kstr[i]);
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strmark(f->kstr[i]);
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for (i=0; i<f->nkproto; i++)
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protomark(L, f->kproto[i]);
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protomark(f->kproto[i]);
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if (f->locvars) { /* is there debug information? */
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LocVar *lv;
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for (lv=f->locvars; lv->pc != -1; lv++) /* mark local-variable names */
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if (lv->varname) strmark(L, lv->varname);
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if (lv->varname) strmark(lv->varname);
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}
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}
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}
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static void closuremark (lua_State *L, Closure *f) {
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if (!f->marked) {
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int i = f->nupvalues;
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f->marked = 1;
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while (i--)
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markobject(L, &f->upvalue[i]);
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}
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}
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static void tablemark (lua_State *L, Hash *h) {
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if (!h->marked) {
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int i;
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h->marked = 1;
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for (i=h->size-1; i>=0; i--) {
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Node *n = node(h,i);
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if (ttype(key(n)) != TAG_NIL) {
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if (ttype(val(n)) == TAG_NIL)
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luaH_remove(h, key(n)); /* dead element; try to remove it */
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markobject(L, &n->key);
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markobject(L, &n->val);
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}
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}
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}
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}
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static void travstack (lua_State *L) {
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static void markstack (lua_State *L, GCState *st) {
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StkId o;
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for (o=L->stack; o<L->top; o++)
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markobject(L, o);
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markobject(st, o);
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}
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static void travlock (lua_State *L) {
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static void marklock (lua_State *L, GCState *st) {
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int i;
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for (i=0; i<L->refSize; i++) {
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if (L->refArray[i].st == LOCK)
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markobject(L, &L->refArray[i].o);
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markobject(st, &L->refArray[i].o);
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}
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}
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static int markobject (lua_State *L, TObject *o) {
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static void marktagmethods (lua_State *L, GCState *st) {
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int e;
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for (e=0; e<IM_N; e++) {
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int t;
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for (t=0; t<=L->last_tag; t++)
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markobject(st, luaT_getim(L, t,e));
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}
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}
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static int markobject (GCState *st, TObject *o) {
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switch (ttype(o)) {
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case TAG_USERDATA: case TAG_STRING:
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strmark(L, tsvalue(o));
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strmark(tsvalue(o));
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break;
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case TAG_TABLE:
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tablemark(L, hvalue(o));
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break;
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case TAG_LCLOSURE:
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protomark(L, clvalue(o)->f.l);
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closuremark(L, clvalue(o));
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break;
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case TAG_LMARK: {
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Closure *cl = infovalue(o)->func;
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protomark(L, cl->f.l);
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closuremark(L, cl);
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case TAG_TABLE: {
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if (!ismarked(hvalue(o))) {
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hvalue(o)->mark = st->tmark; /* chain it in list of marked */
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st->tmark = hvalue(o);
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}
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break;
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}
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case TAG_LMARK: {
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Closure *cl = infovalue(o)->func;
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if (!ismarked(cl)) {
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protomark(cl->f.l);
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cl->mark = st->cmark; /* chain it for later traversal */
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st->cmark = cl;
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}
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break;
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}
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case TAG_LCLOSURE:
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protomark(clvalue(o)->f.l);
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/* go through */
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case TAG_CCLOSURE: case TAG_CMARK:
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closuremark(L, clvalue(o));
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if (!ismarked(clvalue(o))) {
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clvalue(o)->mark = st->cmark; /* chain it for later traversal */
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st->cmark = clvalue(o);
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}
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break;
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default: break; /* numbers, etc */
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}
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@ -118,6 +115,41 @@ static int markobject (lua_State *L, TObject *o) {
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}
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static void markall (lua_State *L) {
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GCState st;
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st.cmark = NULL;
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st.tmark = L->gt; /* put table of globals in mark list */
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L->gt->mark = NULL;
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marktagmethods(L, &st); /* mark tag methods */
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markstack(L, &st); /* mark stack objects */
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marklock(L, &st); /* mark locked objects */
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for (;;) { /* mark tables and closures */
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if (st.cmark) {
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int i;
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Closure *f = st.cmark; /* get first closure from list */
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st.cmark = f->mark; /* remove it from list */
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for (i=0; i<f->nupvalues; i++) /* mark its upvalues */
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markobject(&st, &f->upvalue[i]);
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}
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else if (st.tmark) {
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int i;
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Hash *h = st.tmark; /* get first table from list */
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st.tmark = h->mark; /* remove it from list */
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for (i=0; i<h->size; i++) {
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Node *n = node(h, i);
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if (ttype(key(n)) != TAG_NIL) {
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if (ttype(val(n)) == TAG_NIL)
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luaH_remove(h, key(n)); /* dead element; try to remove it */
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markobject(&st, &n->key);
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markobject(&st, &n->val);
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}
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}
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}
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else break; /* nothing else to mark */
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}
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}
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static void collectproto (lua_State *L) {
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Proto **p = &L->rootproto;
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Proto *next;
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@ -138,8 +170,8 @@ static void collectclosure (lua_State *L) {
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Closure **p = &L->rootcl;
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Closure *next;
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while ((next = *p) != NULL) {
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if (next->marked) {
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next->marked = 0;
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if (ismarked(next)) {
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next->mark = next; /* unmark */
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p = &next->next;
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}
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else {
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@ -154,8 +186,8 @@ static void collecttable (lua_State *L) {
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Hash **p = &L->roottable;
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Hash *next;
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while ((next = *p) != NULL) {
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if (next->marked) {
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next->marked = 0;
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if (ismarked(next)) {
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next->mark = next; /* unmark */
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p = &next->next;
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}
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else {
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@ -256,14 +288,6 @@ static void callgcTMudata (lua_State *L) {
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}
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static void markall (lua_State *L) {
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luaT_travtagmethods(L, markobject); /* mark tag methods */
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travstack(L); /* mark stack objects */
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tablemark(L, L->gt); /* mark global variables */
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travlock(L); /* mark locked objects */
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}
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void luaC_collect (lua_State *L, int all) {
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int oldah = L->allowhooks;
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L->allowhooks = 0; /* stop debug hooks during GC */
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24
lobject.h
24
lobject.h
@ -1,5 +1,5 @@
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/*
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** $Id: lobject.h,v 1.69 2000/06/28 20:20:36 roberto Exp roberto $
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** $Id: lobject.h,v 1.70 2000/06/30 14:35:17 roberto Exp roberto $
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** Type definitions for Lua objects
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** See Copyright Notice in lua.h
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*/
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@ -110,15 +110,15 @@ typedef struct TString {
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** Function Prototypes
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*/
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typedef struct Proto {
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struct Proto *next;
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int marked;
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struct TString **kstr; /* strings used by the function */
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int nkstr; /* size of `kstr' */
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Number *knum; /* Number numbers used by the function */
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int nknum; /* size of `knum' */
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struct TString **kstr; /* strings used by the function */
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int nkstr; /* size of `kstr' */
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struct Proto **kproto; /* functions defined inside the function */
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int nkproto; /* size of `kproto' */
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Instruction *code; /* ends with opcode ENDCODE */
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struct Proto *next;
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int marked;
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int *lines; /* source line that generated each opcode */
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int lineDefined;
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TString *source;
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@ -139,12 +139,12 @@ typedef struct LocVar {
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** Closures
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*/
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typedef struct Closure {
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struct Closure *next;
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int marked;
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union {
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lua_CFunction c; /* C functions */
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struct Proto *l; /* Lua functions */
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} f;
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struct Closure *next;
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struct Closure *mark; /* marked closures (point to itself when not marked) */
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int nupvalues;
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TObject upvalue[1];
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} Closure;
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@ -157,15 +157,21 @@ typedef struct Node {
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} Node;
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typedef struct Hash {
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int htag;
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Node *node;
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int htag;
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int size;
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Node *firstfree; /* this position is free; all positions after it are full */
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struct Hash *next;
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int marked;
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struct Hash *mark; /* marked tables (point to itself when not marked) */
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} Hash;
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/* unmarked tables and closures are represented by pointing `mark' to
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** themselves
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*/
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#define ismarked(x) ((x)->mark != (x))
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/*
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** informations about a call (for debugging)
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*/
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12
lref.c
12
lref.c
@ -1,5 +1,5 @@
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/*
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** $Id: lref.c,v 1.14 2000/06/12 13:52:05 roberto Exp roberto $
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** $Id: lref.c,v 1.15 2000/06/30 14:35:17 roberto Exp roberto $
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** reference mechanism
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** See Copyright Notice in lua.h
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*/
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@ -81,15 +81,15 @@ void lua_endblock (lua_State *L) {
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static int ismarked (const TObject *o) {
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static int hasmark (const TObject *o) {
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/* valid only for locked objects */
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switch (o->ttype) {
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case TAG_STRING: case TAG_USERDATA:
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return tsvalue(o)->marked;
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case TAG_TABLE:
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return hvalue(o)->marked;
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return ismarked(hvalue(o));
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case TAG_LCLOSURE: case TAG_CCLOSURE:
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return clvalue(o)->marked;
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return ismarked(clvalue(o)->mark);
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default: /* number */
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return 1;
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}
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@ -104,9 +104,9 @@ void luaR_invalidaterefs (lua_State *L) {
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int i;
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for (i=0; i<n; i++) {
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struct Ref *r = &L->refArray[i];
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if (r->st == HOLD && !ismarked(&r->o))
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if (r->st == HOLD && !hasmark(&r->o))
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r->st = COLLECTED;
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LUA_ASSERT((r->st == LOCK && ismarked(&r->o)) ||
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LUA_ASSERT((r->st == LOCK && hasmark(&r->o)) ||
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r->st == COLLECTED ||
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r->st == NONEXT ||
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(r->st < n && VALIDLINK(L, L->refArray[r->st].st, n)),
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12
ltable.c
12
ltable.c
@ -1,5 +1,5 @@
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/*
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** $Id: ltable.c,v 1.50 2000/06/30 14:35:17 roberto Exp roberto $
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** $Id: ltable.c,v 1.51 2000/08/04 19:38:35 roberto Exp roberto $
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** Lua tables (hash)
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** See Copyright Notice in lua.h
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*/
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@ -127,14 +127,16 @@ int luaH_pos (lua_State *L, const Hash *t, const TObject *key) {
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** hash, change `key' for a number with the same hash.
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*/
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void luaH_remove (Hash *t, TObject *key) {
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/* do not remove numbers */
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if (ttype(key) != TAG_NUMBER) {
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if (ttype(key) == TAG_NUMBER ||
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(ttype(key) == TAG_STRING && tsvalue(key)->u.s.len <= 30))
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return; /* do not remove numbers nor small strings */
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else {
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/* try to find a number `n' with the same hash as `key' */
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Node *mp = luaH_mainposition(t, key);
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int n = mp - &t->node[0];
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/* make sure `n' is not in `t' */
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while (luaH_getnum(t, n) != &luaO_nilobject) {
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if (t->size >= MAX_INT-n)
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if (n >= MAX_INT - t->size)
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return; /* give up; (to avoid overflow) */
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n += t->size;
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}
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@ -165,7 +167,7 @@ Hash *luaH_new (lua_State *L, int size) {
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t->htag = TagDefault;
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t->next = L->roottable;
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L->roottable = t;
|
||||
t->marked = 0;
|
||||
t->mark = t;
|
||||
t->size = 0;
|
||||
L->nblocks += gcsize(L, 0);
|
||||
t->node = NULL;
|
||||
|
||||
15
ltm.c
15
ltm.c
@ -1,5 +1,5 @@
|
||||
/*
|
||||
** $Id: ltm.c,v 1.43 2000/06/12 13:52:05 roberto Exp roberto $
|
||||
** $Id: ltm.c,v 1.44 2000/08/04 19:38:35 roberto Exp roberto $
|
||||
** Tag methods
|
||||
** See Copyright Notice in lua.h
|
||||
*/
|
||||
@ -147,16 +147,3 @@ void luaT_settagmethod (lua_State *L, int t, const char *event, TObject *func) {
|
||||
*luaT_getim(L, t, e) = temp;
|
||||
}
|
||||
|
||||
|
||||
const char *luaT_travtagmethods (lua_State *L,
|
||||
int (*fn)(lua_State *, TObject *)) { /* ORDER IM */
|
||||
int e;
|
||||
for (e=IM_GETTABLE; e<=IM_FUNCTION; e++) {
|
||||
int t;
|
||||
for (t=0; t<=L->last_tag; t++)
|
||||
if (fn(L, luaT_getim(L, t,e)))
|
||||
return luaT_eventname[e];
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
|
||||
3
ltm.h
3
ltm.h
@ -1,5 +1,5 @@
|
||||
/*
|
||||
** $Id: ltm.h,v 1.12 2000/03/30 16:41:51 roberto Exp roberto $
|
||||
** $Id: ltm.h,v 1.13 2000/05/30 18:54:49 roberto Exp roberto $
|
||||
** Tag methods
|
||||
** See Copyright Notice in lua.h
|
||||
*/
|
||||
@ -52,7 +52,6 @@ void luaT_realtag (lua_State *L, int tag);
|
||||
int luaT_effectivetag (lua_State *L, const TObject *o);
|
||||
void luaT_settagmethod (lua_State *L, int t, const char *event, TObject *func);
|
||||
const TObject *luaT_gettagmethod (lua_State *L, int t, const char *event);
|
||||
const char *luaT_travtagmethods (lua_State *L, int (*fn)(lua_State *, TObject *));
|
||||
int luaT_validevent (int t, int e); /* used by compatibility module */
|
||||
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user