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added 'local' bit (true => object is only refered by local variables)

pull/9/head
Roberto Ierusalimschy 11 years ago
parent
3679d33b02
commit
439d74e29f
10 changed files with 96 additions and 53 deletions
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  1. 8
      lapi.c
  2. 4
      lfunc.c
  3. 26
      lgc.c
  4. 20
      lgc.h
  5. 3
      lparser.c
  6. 17
      lstate.c
  7. 4
      lstring.h
  8. 57
      ltests.c
  9. 7
      lundump.c
  10. 3
      lvm.c

8
lapi.c
View File

@ -1,5 +1,5 @@
/* /*
** $Id: lapi.c,v 2.185 2013/07/05 14:29:51 roberto Exp roberto $ ** $Id: lapi.c,v 2.186 2013/08/05 16:58:28 roberto Exp roberto $
** Lua API ** Lua API
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -586,8 +586,11 @@ LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
cl = luaF_newCclosure(L, n); cl = luaF_newCclosure(L, n);
cl->c.f = fn; cl->c.f = fn;
L->top -= n; L->top -= n;
while (n--) while (n--) {
setobj2n(L, &cl->c.upvalue[n], L->top + n); setobj2n(L, &cl->c.upvalue[n], L->top + n);
/* does not need barrier because closure is white */
valnolocal(L->top + n); /* but needs 'local barrier' */
}
setclCvalue(L, L->top, cl); setclCvalue(L, L->top, cl);
} }
api_incr_top(L); api_incr_top(L);
@ -861,6 +864,7 @@ LUA_API int lua_setmetatable (lua_State *L, int objindex) {
} }
default: { default: {
G(L)->mt[ttnov(obj)] = mt; G(L)->mt[ttnov(obj)] = mt;
if (mt) nolocal(obj2gco(mt));
break; break;
} }
} }

4
lfunc.c
View File

@ -1,5 +1,5 @@
/* /*
** $Id: lfunc.c,v 2.31 2013/08/05 16:58:28 roberto Exp roberto $ ** $Id: lfunc.c,v 2.32 2013/08/07 12:18:11 roberto Exp roberto $
** Auxiliary functions to manipulate prototypes and closures ** Auxiliary functions to manipulate prototypes and closures
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -80,6 +80,7 @@ void luaF_close (lua_State *L, StkId level) {
uv->v = &uv->value; /* now current value lives here */ uv->v = &uv->value; /* now current value lives here */
gch(o)->next = g->allgc; /* link upvalue into 'allgc' list */ gch(o)->next = g->allgc; /* link upvalue into 'allgc' list */
g->allgc = o; g->allgc = o;
valnolocal(uv->v); /* keep local invariant */
luaC_checkupvalcolor(g, uv); luaC_checkupvalcolor(g, uv);
} }
} }
@ -88,6 +89,7 @@ void luaF_close (lua_State *L, StkId level) {
Proto *luaF_newproto (lua_State *L) { Proto *luaF_newproto (lua_State *L) {
Proto *f = &luaC_newobj(L, LUA_TPROTO, sizeof(Proto), NULL, 0)->p; Proto *f = &luaC_newobj(L, LUA_TPROTO, sizeof(Proto), NULL, 0)->p;
nolocal(obj2gco(f)); /* prototypes are never local */
f->k = NULL; f->k = NULL;
f->sizek = 0; f->sizek = 0;
f->p = NULL; f->p = NULL;

26
lgc.c
View File

@ -1,5 +1,5 @@
/* /*
** $Id: lgc.c,v 2.144 2013/08/07 15:39:09 roberto Exp roberto $ ** $Id: lgc.c,v 2.145 2013/08/13 17:36:44 roberto Exp roberto $
** Garbage Collector ** Garbage Collector
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -74,11 +74,19 @@
lua_longassert(!iscollectable(obj) || righttt(obj)) lua_longassert(!iscollectable(obj) || righttt(obj))
#define markvalue(g,o) { checkconsistency(o); \ #define marklocalvalue(g,o) { checkconsistency(o); \
if (valiswhite(o)) reallymarkobject(g,gcvalue(o)); } if (valiswhite(o)) reallymarkobject(g,gcvalue(o)); }
#define markobject(g,t) { if ((t) && iswhite(obj2gco(t))) \ #define markvalue(g,o) { \
reallymarkobject(g, obj2gco(t)); } lua_longassert(!(iscollectable(o) && islocal(gcvalue(o)))); \
marklocalvalue(g,o); }
#define marklocalobject(g,t) { \
if ((t) && iswhite(obj2gco(t))) \
reallymarkobject(g, obj2gco(t)); }
#define markobject(g,t) \
{ lua_assert((t) == NULL || !islocal(obj2gco(t))); marklocalobject(g,t); }
static void reallymarkobject (global_State *g, GCObject *o); static void reallymarkobject (global_State *g, GCObject *o);
@ -259,7 +267,7 @@ static void reallymarkobject (global_State *g, GCObject *o) {
} }
case LUA_TUPVAL: { case LUA_TUPVAL: {
UpVal *uv = gco2uv(o); UpVal *uv = gco2uv(o);
markvalue(g, uv->v); marklocalvalue(g, uv->v);
if (uv->v != &uv->value) /* open? */ if (uv->v != &uv->value) /* open? */
return; /* open upvalues remain gray */ return; /* open upvalues remain gray */
size = sizeof(UpVal); size = sizeof(UpVal);
@ -331,7 +339,7 @@ static void remarkupvals (global_State *g) {
GCObject *uv = gco2th(thread)->openupval; GCObject *uv = gco2th(thread)->openupval;
for (; uv != NULL; uv = gch(uv)->next) { for (; uv != NULL; uv = gch(uv)->next) {
if (isgray(uv)) /* marked? */ if (isgray(uv)) /* marked? */
markvalue(g, gco2uv(uv)->v); /* remark upvalue's value */ marklocalvalue(g, gco2uv(uv)->v); /* remark upvalue's value */
} }
} }
} }
@ -486,7 +494,7 @@ static int traverseproto (global_State *g, Proto *f) {
static lu_mem traverseCclosure (global_State *g, CClosure *cl) { static lu_mem traverseCclosure (global_State *g, CClosure *cl) {
int i; int i;
for (i = 0; i < cl->nupvalues; i++) /* mark its upvalues */ for (i = 0; i < cl->nupvalues; i++) /* mark its upvalues */
markvalue(g, &cl->upvalue[i]); marklocalvalue(g, &cl->upvalue[i]);
return sizeCclosure(cl->nupvalues); return sizeCclosure(cl->nupvalues);
} }
@ -494,7 +502,7 @@ static lu_mem traverseLclosure (global_State *g, LClosure *cl) {
int i; int i;
markobject(g, cl->p); /* mark its prototype */ markobject(g, cl->p); /* mark its prototype */
for (i = 0; i < cl->nupvalues; i++) /* mark its upvalues */ for (i = 0; i < cl->nupvalues; i++) /* mark its upvalues */
markobject(g, cl->upvals[i]); marklocalobject(g, cl->upvals[i]);
return sizeLclosure(cl->nupvalues); return sizeLclosure(cl->nupvalues);
} }
@ -505,7 +513,7 @@ static lu_mem traversestack (global_State *g, lua_State *th) {
if (o == NULL) if (o == NULL)
return 1; /* stack not completely built yet */ return 1; /* stack not completely built yet */
for (; o < th->top; o++) /* mark live elements in the stack */ for (; o < th->top; o++) /* mark live elements in the stack */
markvalue(g, o); marklocalvalue(g, o);
if (g->gcstate == GCSatomic) { /* final traversal? */ if (g->gcstate == GCSatomic) { /* final traversal? */
StkId lim = th->stack + th->stacksize; /* real end of stack */ StkId lim = th->stack + th->stacksize; /* real end of stack */
for (; o < lim; o++) /* clear not-marked stack slice */ for (; o < lim; o++) /* clear not-marked stack slice */

20
lgc.h
View File

@ -1,5 +1,5 @@
/* /*
** $Id: lgc.h,v 2.59 2013/08/05 16:58:28 roberto Exp roberto $ ** $Id: lgc.h,v 2.60 2013/08/13 17:36:44 roberto Exp roberto $
** Garbage Collector ** Garbage Collector
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -79,6 +79,7 @@
#define FINALIZEDBIT 3 /* object has been separated for finalization */ #define FINALIZEDBIT 3 /* object has been separated for finalization */
#define SEPARATED 4 /* object is in 'finobj' list or in 'tobefnz' */ #define SEPARATED 4 /* object is in 'finobj' list or in 'tobefnz' */
#define FIXEDBIT 5 /* object is fixed (should not be collected) */ #define FIXEDBIT 5 /* object is fixed (should not be collected) */
#define LOCALBIT 6 /* object is not local */
/* bit 7 is currently used by tests (luaL_checkmemory) */ /* bit 7 is currently used by tests (luaL_checkmemory) */
#define WHITEBITS bit2mask(WHITE0BIT, WHITE1BIT) #define WHITEBITS bit2mask(WHITE0BIT, WHITE1BIT)
@ -88,6 +89,7 @@
#define isblack(x) testbit((x)->gch.marked, BLACKBIT) #define isblack(x) testbit((x)->gch.marked, BLACKBIT)
#define isgray(x) /* neither white nor black */ \ #define isgray(x) /* neither white nor black */ \
(!testbits((x)->gch.marked, WHITEBITS | bitmask(BLACKBIT))) (!testbits((x)->gch.marked, WHITEBITS | bitmask(BLACKBIT)))
#define islocal(x) (!testbit((x)->gch.marked, LOCALBIT))
#define otherwhite(g) (g->currentwhite ^ WHITEBITS) #define otherwhite(g) (g->currentwhite ^ WHITEBITS)
@ -97,6 +99,9 @@
#define changewhite(x) ((x)->gch.marked ^= WHITEBITS) #define changewhite(x) ((x)->gch.marked ^= WHITEBITS)
#define gray2black(x) l_setbit((x)->gch.marked, BLACKBIT) #define gray2black(x) l_setbit((x)->gch.marked, BLACKBIT)
#define nolocal(x) l_setbit((x)->gch.marked, LOCALBIT)
#define valnolocal(v) { if (iscollectable(v)) nolocal(gcvalue(v)); }
#define luaC_white(g) cast(lu_byte, (g)->currentwhite & WHITEBITS) #define luaC_white(g) cast(lu_byte, (g)->currentwhite & WHITEBITS)
@ -106,22 +111,25 @@
#define luaC_barrier(L,p,v) { \ #define luaC_barrier(L,p,v) { \
if (iscollectable(v) && isblack(obj2gco(p)) && iswhite(gcvalue(v))) \ if (iscollectable(v) && \
(nolocal(gcvalue(v)), isblack(obj2gco(p)) && iswhite(gcvalue(v)))) \
luaC_barrier_(L,obj2gco(p),gcvalue(v)); } luaC_barrier_(L,obj2gco(p),gcvalue(v)); }
#define luaC_barrierback(L,p,v) { \ #define luaC_barrierback(L,p,v) { \
if (iscollectable(v) && isblack(obj2gco(p)) && iswhite(gcvalue(v))) \ if (iscollectable(v) && \
(nolocal(gcvalue(v)), isblack(obj2gco(p)) && iswhite(gcvalue(v)))) \
luaC_barrierback_(L,p); } luaC_barrierback_(L,p); }
#define luaC_objbarrier(L,p,o) { \ #define luaC_objbarrier(L,p,o) { \
if (isblack(obj2gco(p)) && iswhite(obj2gco(o))) \ if (nolocal(obj2gco(o)), isblack(obj2gco(p)) && iswhite(obj2gco(o))) \
luaC_barrier_(L,obj2gco(p),obj2gco(o)); } luaC_barrier_(L,obj2gco(p),obj2gco(o)); }
#define luaC_objbarrierback(L,p,o) \ #define luaC_objbarrierback(L,p,o) \
{ if (isblack(obj2gco(p)) && iswhite(obj2gco(o))) luaC_barrierback_(L,p); } { if (nolocal(obj2gco(o)), isblack(obj2gco(p)) && iswhite(obj2gco(o))) \
luaC_barrierback_(L,p); }
#define luaC_barrierproto(L,p,c) \ #define luaC_barrierproto(L,p,c) \
{ if (isblack(obj2gco(p))) luaC_barrierproto_(L,p,c); } { if (nolocal(obj2gco(c)), isblack(obj2gco(p))) luaC_barrierproto_(L,p,c); }
LUAI_FUNC void luaC_freeallobjects (lua_State *L); LUAI_FUNC void luaC_freeallobjects (lua_State *L);
LUAI_FUNC void luaC_step (lua_State *L); LUAI_FUNC void luaC_step (lua_State *L);

3
lparser.c
View File

@ -1,5 +1,5 @@
/* /*
** $Id: lparser.c,v 2.132 2013/04/25 19:35:19 roberto Exp roberto $ ** $Id: lparser.c,v 2.133 2013/04/26 13:07:53 roberto Exp roberto $
** Lua Parser ** Lua Parser
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -1632,6 +1632,7 @@ Closure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff,
incr_top(L); incr_top(L);
funcstate.f = cl->l.p = luaF_newproto(L); funcstate.f = cl->l.p = luaF_newproto(L);
funcstate.f->source = luaS_new(L, name); /* create and anchor TString */ funcstate.f->source = luaS_new(L, name); /* create and anchor TString */
luaC_objbarrier(L, funcstate.f, funcstate.f->source);
lexstate.buff = buff; lexstate.buff = buff;
lexstate.dyd = dyd; lexstate.dyd = dyd;
dyd->actvar.n = dyd->gt.n = dyd->label.n = 0; dyd->actvar.n = dyd->gt.n = dyd->label.n = 0;

17
lstate.c
View File

@ -1,5 +1,5 @@
/* /*
** $Id: lstate.c,v 2.100 2013/08/05 16:58:28 roberto Exp roberto $ ** $Id: lstate.c,v 2.101 2013/08/07 12:18:11 roberto Exp roberto $
** Global State ** Global State
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -159,17 +159,19 @@ static void freestack (lua_State *L) {
** Create registry table and its predefined values ** Create registry table and its predefined values
*/ */
static void init_registry (lua_State *L, global_State *g) { static void init_registry (lua_State *L, global_State *g) {
TValue mt; TValue temp;
/* create registry */ /* create registry */
Table *registry = luaH_new(L); Table *registry = luaH_new(L);
sethvalue(L, &g->l_registry, registry); sethvalue(L, &g->l_registry, registry);
luaH_resize(L, registry, LUA_RIDX_LAST, 0); luaH_resize(L, registry, LUA_RIDX_LAST, 0);
nolocal(obj2gco(registry));
/* registry[LUA_RIDX_MAINTHREAD] = L */ /* registry[LUA_RIDX_MAINTHREAD] = L */
setthvalue(L, &mt, L); setthvalue(L, &temp, L); /* temp = L */
luaH_setint(L, registry, LUA_RIDX_MAINTHREAD, &mt); luaH_setint(L, registry, LUA_RIDX_MAINTHREAD, &temp);
/* registry[LUA_RIDX_GLOBALS] = table of globals */ /* registry[LUA_RIDX_GLOBALS] = table of globals */
sethvalue(L, &mt, luaH_new(L)); sethvalue(L, &temp, luaH_new(L)); /* temp = new table (global table) */
luaH_setint(L, registry, LUA_RIDX_GLOBALS, &mt); luaH_setint(L, registry, LUA_RIDX_GLOBALS, &temp);
valnolocal(&temp); /* keep local invariant */
} }
@ -236,6 +238,7 @@ LUA_API lua_State *lua_newthread (lua_State *L) {
setthvalue(L, L->top, L1); setthvalue(L, L->top, L1);
api_incr_top(L); api_incr_top(L);
preinit_state(L1, G(L)); preinit_state(L1, G(L));
nolocal(obj2gco(L1)); /* threads are never local */
L1->hookmask = L->hookmask; L1->hookmask = L->hookmask;
L1->basehookcount = L->basehookcount; L1->basehookcount = L->basehookcount;
L1->hook = L->hook; L1->hook = L->hook;
@ -268,7 +271,7 @@ LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
L->next = NULL; L->next = NULL;
L->tt = LUA_TTHREAD; L->tt = LUA_TTHREAD;
g->currentwhite = bit2mask(WHITE0BIT, FIXEDBIT); g->currentwhite = bit2mask(WHITE0BIT, FIXEDBIT);
L->marked = luaC_white(g); L->marked = luaC_white(g) | bitmask(LOCALBIT);
g->gckind = KGC_NORMAL; g->gckind = KGC_NORMAL;
preinit_state(L, g); preinit_state(L, g);
g->frealloc = f; g->frealloc = f;

4
lstring.h
View File

@ -1,5 +1,5 @@
/* /*
** $Id: lstring.h,v 1.48 2012/01/25 21:05:40 roberto Exp roberto $ ** $Id: lstring.h,v 1.49 2012/02/01 21:57:15 roberto Exp roberto $
** String table (keep all strings handled by Lua) ** String table (keep all strings handled by Lua)
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -19,7 +19,7 @@
#define luaS_newliteral(L, s) (luaS_newlstr(L, "" s, \ #define luaS_newliteral(L, s) (luaS_newlstr(L, "" s, \
(sizeof(s)/sizeof(char))-1)) (sizeof(s)/sizeof(char))-1))
#define luaS_fix(s) l_setbit((s)->tsv.marked, FIXEDBIT) #define luaS_fix(s) setbits((s)->tsv.marked, bit2mask(FIXEDBIT, LOCALBIT))
/* /*

57
ltests.c
View File

@ -1,5 +1,5 @@
/* /*
** $Id: ltests.c,v 2.140 2013/08/05 16:58:28 roberto Exp roberto $ ** $Id: ltests.c,v 2.141 2013/08/07 12:18:11 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
*/ */
@ -188,6 +188,25 @@ static int testobjref1 (global_State *g, GCObject *f, GCObject *t) {
} }
/*
** Check locality
*/
static int testobjref2 (GCObject *f, GCObject *t) {
/* not a local or pointed by a thread? */
if (!islocal(t) || gch(f)->tt == LUA_TTHREAD)
return 1; /* ok */
if (gch(t)->tt == LUA_TUPVAL) {
lua_assert(gch(f)->tt == LUA_TLCL);
return 1; /* upvalue pointed by a closure */
}
if (gch(f)->tt == LUA_TUPVAL) {
UpVal *uv = gco2uv(f);
return (uv->v != &uv->value); /* open upvalue can point to local stuff */
}
return 0;
}
static void printobj (global_State *g, GCObject *o) { static void printobj (global_State *g, GCObject *o) {
int i = 1; int i = 1;
GCObject *p; GCObject *p;
@ -198,24 +217,30 @@ static void printobj (global_State *g, GCObject *o) {
if (p == NULL) i = 0; /* zero means 'not found' */ if (p == NULL) i = 0; /* zero means 'not found' */
else i = -i; /* negative means 'found in findobj list */ else i = -i; /* negative means 'found in findobj list */
} }
printf("||%d:%s(%p)-%c(%02X)||", i, ttypename(gch(o)->tt), (void *)o, printf("||%d:%s(%p)-%s-%c(%02X)||",
i, ttypename(novariant(gch(o)->tt)), (void *)o,
islocal(o)?"L":"NL",
isdead(g,o)?'d':isblack(o)?'b':iswhite(o)?'w':'g', gch(o)->marked); isdead(g,o)?'d':isblack(o)?'b':iswhite(o)?'w':'g', gch(o)->marked);
} }
static int testobjref (global_State *g, GCObject *f, GCObject *t) { static int testobjref (global_State *g, GCObject *f, GCObject *t) {
int r = testobjref1(g,f,t); int r1 = testobjref1(g,f,t);
if (!r) { int r2 = testobjref2(f,t);
printf("%d(%02X) - ", g->gcstate, g->currentwhite); if (!r1 || !r2) {
if (!r1)
printf("%d(%02X) - ", g->gcstate, g->currentwhite);
else
printf("local violation - ");
printobj(g, f); printobj(g, f);
printf("\t-> "); printf(" -> ");
printobj(g, t); printobj(g, t);
printf("\n"); printf("\n");
} }
return r; return r1 && r2;
} }
#define checkobjref(g,f,t) lua_assert(testobjref(g,f,obj2gco(t))) #define checkobjref(g,f,t) lua_assert(testobjref(g,f,obj2gco(t)))
static void checkvalref (global_State *g, GCObject *f, const TValue *t) { static void checkvalref (global_State *g, GCObject *f, const TValue *t) {
@ -349,6 +374,7 @@ static void checkobject (global_State *g, GCObject *o, int maybedead) {
break; break;
} }
case LUA_TTHREAD: { case LUA_TTHREAD: {
lua_assert(!islocal(o));
checkstack(g, gco2th(o)); checkstack(g, gco2th(o));
break; break;
} }
@ -617,22 +643,9 @@ static int get_gccolor (lua_State *L) {
o = obj_at(L, 1); o = obj_at(L, 1);
if (!iscollectable(o)) if (!iscollectable(o))
lua_pushstring(L, "no collectable"); lua_pushstring(L, "no collectable");
else { else
int marked = gcvalue(o)->gch.marked;
int n = 1;
lua_pushstring(L, iswhite(gcvalue(o)) ? "white" : lua_pushstring(L, iswhite(gcvalue(o)) ? "white" :
isblack(gcvalue(o)) ? "black" : "grey"); isblack(gcvalue(o)) ? "black" : "grey");
if (testbit(marked, FINALIZEDBIT)) {
lua_pushliteral(L, "/finalized"); n++;
}
if (testbit(marked, SEPARATED)) {
lua_pushliteral(L, "/separated"); n++;
}
if (testbit(marked, FIXEDBIT)) {
lua_pushliteral(L, "/fixed"); n++;
}
lua_concat(L, n);
}
return 1; return 1;
} }

7
lundump.c
View File

@ -1,5 +1,5 @@
/* /*
** $Id: lundump.c,v 2.22 2012/05/08 13:53:33 roberto Exp roberto $ ** $Id: lundump.c,v 2.23 2013/04/26 18:48:35 roberto Exp roberto $
** load precompiled Lua chunks ** load precompiled Lua chunks
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -84,9 +84,12 @@ static TString* LoadString(LoadState* S)
return NULL; return NULL;
else else
{ {
TString* ts;
char* s=luaZ_openspace(S->L,S->b,size); char* s=luaZ_openspace(S->L,S->b,size);
LoadBlock(S,s,size*sizeof(char)); LoadBlock(S,s,size*sizeof(char));
return luaS_newlstr(S->L,s,size-1); /* remove trailing '\0' */ ts = luaS_newlstr(S->L,s,size-1); /* remove trailing '\0' */
nolocal(obj2gco(ts)); /* all strings here anchored in non-thread objects */
return ts;
} }
} }

3
lvm.c
View File

@ -1,5 +1,5 @@
/* /*
** $Id: lvm.c,v 2.175 2013/06/20 15:02:49 roberto Exp roberto $ ** $Id: lvm.c,v 2.176 2013/07/10 17:15:12 roberto Exp roberto $
** Lua virtual machine ** Lua virtual machine
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -416,6 +416,7 @@ static void pushclosure (lua_State *L, Proto *p, UpVal **encup, StkId base,
ncl->l.upvals[i] = luaF_findupval(L, base + uv[i].idx); ncl->l.upvals[i] = luaF_findupval(L, base + uv[i].idx);
else /* get upvalue from enclosing function */ else /* get upvalue from enclosing function */
ncl->l.upvals[i] = encup[uv[i].idx]; ncl->l.upvals[i] = encup[uv[i].idx];
/* new closure is white and local, so we do not need a barrier here */
} }
luaC_barrierproto(L, p, ncl); luaC_barrierproto(L, p, ncl);
p->cache = ncl; /* save it on cache for reuse */ p->cache = ncl; /* save it on cache for reuse */

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