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openwrt/package/lua/patches/600-refcounting.patch

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--- a/src/lapi.c
+++ b/src/lapi.c
@@ -27,8 +27,8 @@
#include "ltable.h"
#include "ltm.h"
#include "lundump.h"
-#include "lvm.h"
#include "lnum.h"
+#include "lvm.h"
const char lua_ident[] =
@@ -117,6 +117,7 @@ LUA_API void lua_xmove (lua_State *from,
from->top -= n;
for (i = 0; i < n; i++) {
setobj2s(to, to->top++, from->top + i);
+ setnilvalue(from, from->top + i);
}
lua_unlock(to);
}
@@ -166,12 +167,14 @@ LUA_API void lua_settop (lua_State *L, i
if (idx >= 0) {
api_check(L, idx <= L->stack_last - L->base);
while (L->top < L->base + idx)
- setnilvalue(L->top++);
+ setnilvalue(L, L->top++);
L->top = L->base + idx;
+ setnilvalue(L, L->top);
}
else {
+ int i;
api_check(L, -(idx+1) <= (L->top - L->base));
- L->top += idx+1; /* `subtract' index (index is negative) */
+ setlvmtop(L, L->top + idx + 1); /* `subtract' index (index is negative) */
}
lua_unlock(L);
}
@@ -183,7 +186,7 @@ LUA_API void lua_remove (lua_State *L, i
p = index2adr(L, idx);
api_checkvalidindex(L, p);
while (++p < L->top) setobjs2s(L, p-1, p);
- L->top--;
+ setlvmtop(L, L->top - 1);
lua_unlock(L);
}
@@ -196,6 +199,7 @@ LUA_API void lua_insert (lua_State *L, i
api_checkvalidindex(L, p);
for (q = L->top; q>p; q--) setobjs2s(L, q, q-1);
setobjs2s(L, p, L->top);
+ setnilvalue(L, L->top);
lua_unlock(L);
}
@@ -220,7 +224,7 @@ LUA_API void lua_replace (lua_State *L,
if (idx < LUA_GLOBALSINDEX) /* function upvalue? */
luaC_barrier(L, curr_func(L), L->top - 1);
}
- L->top--;
+ setlvmtop(L, L->top - 1);
lua_unlock(L);
}
@@ -259,14 +263,14 @@ LUA_API int lua_iscfunction (lua_State *
LUA_API int lua_isnumber (lua_State *L, int idx) {
- TValue n;
+ TValue n = tvinit();
const TValue *o = index2adr(L, idx);
return tonumber(o, &n);
}
LUA_API int lua_isinteger (lua_State *L, int idx) {
- TValue tmp;
+ TValue tmp = tvinit();
lua_Integer dum;
const TValue *o = index2adr(L, idx);
return tonumber(o,&tmp) && (ttisint(o) || tt_integer_valued(o,&dum));
@@ -319,7 +323,7 @@ LUA_API int lua_lessthan (lua_State *L,
LUA_API lua_Number lua_tonumber (lua_State *L, int idx) {
- TValue n;
+ TValue n = tvinit();
const TValue *o = index2adr(L, idx);
if (tonumber(o, &n)) {
#ifdef LNUM_COMPLEX
@@ -333,7 +337,7 @@ LUA_API lua_Number lua_tonumber (lua_Sta
LUA_API lua_Integer lua_tointeger (lua_State *L, int idx) {
- TValue n;
+ TValue n = tvinit();
/* Lua 5.1 documented behaviour is to return nonzero for non-integer:
* "If the number is not an integer, it is truncated in some non-specified way."
* I would suggest to change this, to return 0 for anything that would
@@ -369,7 +373,7 @@ LUA_API lua_Integer lua_tointeger (lua_S
#ifdef LNUM_COMPLEX
LUA_API lua_Complex lua_tocomplex (lua_State *L, int idx) {
- TValue tmp;
+ TValue tmp = tvinit();
const TValue *o = index2adr(L, idx);
if (tonumber(o, &tmp))
return nvalue_complex(o);
@@ -465,7 +469,7 @@ LUA_API const void *lua_topointer (lua_S
LUA_API void lua_pushnil (lua_State *L) {
lua_lock(L);
- setnilvalue(L->top);
+ setnilvalue(L, L->top);
api_incr_top(L);
lua_unlock(L);
}
@@ -548,8 +552,10 @@ LUA_API void lua_pushcclosure (lua_State
cl = luaF_newCclosure(L, n, getcurrenv(L));
cl->c.f = fn;
L->top -= n;
- while (n--)
+ while (n--) {
setobj2n(L, &cl->c.upvalue[n], L->top+n);
+ setnilvalue(L, L->top + n);
+ }
setclvalue(L, L->top, cl);
lua_assert(iswhite(obj2gco(cl)));
api_incr_top(L);
@@ -600,7 +606,7 @@ LUA_API void lua_gettable (lua_State *L,
LUA_API void lua_getfield (lua_State *L, int idx, const char *k) {
StkId t;
- TValue key;
+ TValue key = tvinit();
lua_lock(L);
t = index2adr(L, idx);
api_checkvalidindex(L, t);
@@ -689,7 +695,7 @@ LUA_API void lua_getfenv (lua_State *L,
setobj2s(L, L->top, gt(thvalue(o)));
break;
default:
- setnilvalue(L->top);
+ setnilvalue(L, L->top);
break;
}
api_incr_top(L);
@@ -709,21 +715,21 @@ LUA_API void lua_settable (lua_State *L,
t = index2adr(L, idx);
api_checkvalidindex(L, t);
luaV_settable(L, t, L->top - 2, L->top - 1);
- L->top -= 2; /* pop index and value */
+ setlvmtop(L, L->top - 2); /* pop index and value */
lua_unlock(L);
}
LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {
StkId t;
- TValue key;
+ TValue key = tvinit();
lua_lock(L);
api_checknelems(L, 1);
t = index2adr(L, idx);
api_checkvalidindex(L, t);
setsvalue(L, &key, luaS_new(L, k));
luaV_settable(L, t, &key, L->top - 1);
- L->top--; /* pop value */
+ setlvmtop(L, L->top - 1); /* pop value */
lua_unlock(L);
}
@@ -736,7 +742,7 @@ LUA_API void lua_rawset (lua_State *L, i
api_check(L, ttistable(t));
setobj2t(L, luaH_set(L, hvalue(t), L->top-2), L->top-1);
luaC_barriert(L, hvalue(t), L->top-1);
- L->top -= 2;
+ setlvmtop(L, L->top - 2);
lua_unlock(L);
}
@@ -749,7 +755,7 @@ LUA_API void lua_rawseti (lua_State *L,
api_check(L, ttistable(o));
setobj2t(L, luaH_setint(L, hvalue(o), n), L->top-1);
luaC_barriert(L, hvalue(o), L->top-1);
- L->top--;
+ setlvmtop(L, L->top - 1);
lua_unlock(L);
}
@@ -785,7 +791,7 @@ LUA_API int lua_setmetatable (lua_State
break;
}
}
- L->top--;
+ setlvmtop(L, L->top - 1);
lua_unlock(L);
return 1;
}
@@ -814,7 +820,7 @@ LUA_API int lua_setfenv (lua_State *L, i
break;
}
if (res) luaC_objbarrier(L, gcvalue(o), hvalue(L->top - 1));
- L->top--;
+ setlvmtop(L, L->top - 1);
lua_unlock(L);
return res;
}
@@ -1040,8 +1046,9 @@ LUA_API int lua_next (lua_State *L, int
if (more) {
api_incr_top(L);
}
- else /* no more elements */
- L->top -= 1; /* remove key */
+ else { /* no more elements */
+ setlvmtop(L, L->top - 1); /* remove key */
+ }
lua_unlock(L);
return more;
}
@@ -1053,7 +1060,7 @@ LUA_API void lua_concat (lua_State *L, i
if (n >= 2) {
luaC_checkGC(L);
luaV_concat(L, n, cast_int(L->top - L->base) - 1);
- L->top -= (n-1);
+ setlvmtop(L, L->top - (n-1));
}
else if (n == 0) { /* push empty string */
setsvalue2s(L, L->top, luaS_newlstr(L, "", 0));
@@ -1139,6 +1146,7 @@ LUA_API const char *lua_setupvalue (lua_
if (name) {
L->top--;
setobj(L, val, L->top);
+ setnilvalue(L, L->top);
luaC_barrier(L, clvalue(fi), L->top);
}
lua_unlock(L);
@@ -1160,7 +1168,7 @@ LUA_API const char *lua_setupvalue (lua_
int lua_pushvalue_as_number (lua_State *L, int idx)
{
const TValue *o = index2adr(L, idx);
- TValue tmp;
+ TValue tmp = tvinit();
lua_Integer i;
if (ttisnumber(o)) {
if ( (!ttisint(o)) && tt_integer_valued(o,&i)) {
--- a/src/lcode.c
+++ b/src/lcode.c
@@ -23,6 +23,7 @@
#include "lparser.h"
#include "ltable.h"
#include "lnum.h"
+#include "lvm.h"
#define hasjumps(e) ((e)->t != (e)->f)
@@ -248,7 +249,7 @@ static int addk (FuncState *fs, TValue *
setivalue(idx, fs->nk);
luaM_growvector(L, f->k, fs->nk, f->sizek, TValue,
MAXARG_Bx, "constant table overflow");
- while (oldsize < f->sizek) setnilvalue(&f->k[oldsize++]);
+ while (oldsize < f->sizek) setnilvalue(L, &f->k[oldsize++]);
setobj(L, &f->k[fs->nk], v);
luaC_barrier(L, f, v);
return fs->nk++;
@@ -257,21 +258,24 @@ static int addk (FuncState *fs, TValue *
int luaK_stringK (FuncState *fs, TString *s) {
- TValue o;
+ TValue o = tvinit();
setsvalue(fs->L, &o, s);
+ luaV_unref(fs->L, &o);
return addk(fs, &o, &o);
}
int luaK_numberK (FuncState *fs, lua_Number r) {
- TValue o;
+ lua_State *L = fs->L;
+ TValue o = tvinit();
setnvalue(&o, r);
return addk(fs, &o, &o);
}
int luaK_integerK (FuncState *fs, lua_Integer r) {
- TValue o;
+ lua_State *L = fs->L;
+ TValue o = tvinit();
setivalue(&o, r);
return addk(fs, &o, &o);
}
@@ -279,22 +283,24 @@ int luaK_integerK (FuncState *fs, lua_In
#ifdef LNUM_COMPLEX
static int luaK_imagK (FuncState *fs, lua_Number r) {
- TValue o;
+ lua_State *L = fs->L;
+ TValue o = tvinit();
setnvalue_complex(&o, r*I);
return addk(fs, &o, &o);
}
#endif
static int boolK (FuncState *fs, int b) {
- TValue o;
+ lua_State *L = fs->L;
+ TValue o = tvinit();
setbvalue(&o, b);
return addk(fs, &o, &o);
}
static int nilK (FuncState *fs) {
- TValue k, v;
- setnilvalue(&v);
+ TValue k = tvinit(), v = tvinit();
+ setnilvalue(fs->L, &v);
/* cannot use nil as key; instead use table itself to represent nil */
sethvalue(fs->L, &k, fs->h);
return addk(fs, &k, &v);
--- a/src/ldebug.c
+++ b/src/ldebug.c
@@ -142,6 +142,7 @@ LUA_API const char *lua_setlocal (lua_St
if (name)
setobjs2s(L, ci->base + (n - 1), L->top - 1);
L->top--; /* pop value */
+ setnilvalue(L, L->top);
lua_unlock(L);
return name;
}
@@ -176,7 +177,7 @@ static void info_tailcall (lua_Debug *ar
static void collectvalidlines (lua_State *L, Closure *f) {
if (f == NULL || f->c.isC) {
- setnilvalue(L->top);
+ setnilvalue(L, L->top);
}
else {
Table *t = luaH_new(L, 0, 0);
@@ -248,7 +249,7 @@ LUA_API int lua_getinfo (lua_State *L, c
}
status = auxgetinfo(L, what, ar, f, ci);
if (strchr(what, 'f')) {
- if (f == NULL) setnilvalue(L->top);
+ if (f == NULL) setnilvalue(L, L->top);
else setclvalue(L, L->top, f);
incr_top(L);
}
@@ -586,7 +587,7 @@ void luaG_concaterror (lua_State *L, Stk
void luaG_aritherror (lua_State *L, const TValue *p1, const TValue *p2) {
- TValue temp;
+ TValue temp = tvinit();
if (luaV_tonumber(p1, &temp) == NULL)
p2 = p1; /* first operand is wrong */
luaG_typeerror(L, p2, "perform arithmetic on");
--- a/src/ldo.c
+++ b/src/ldo.c
@@ -211,7 +211,7 @@ static StkId adjust_varargs (lua_State *
Table *htab = NULL;
StkId base, fixed;
for (; actual < nfixargs; ++actual)
- setnilvalue(L->top++);
+ setnilvalue(L, L->top++);
#if defined(LUA_COMPAT_VARARG)
if (p->is_vararg & VARARG_NEEDSARG) { /* compat. with old-style vararg? */
int nvar = actual - nfixargs; /* number of extra arguments */
@@ -229,7 +229,7 @@ static StkId adjust_varargs (lua_State *
base = L->top; /* final position of first argument */
for (i=0; i<nfixargs; i++) {
setobjs2s(L, L->top++, fixed+i);
- setnilvalue(fixed+i);
+ setnilvalue(L, fixed+i);
}
/* add `arg' parameter */
if (htab) {
@@ -294,7 +294,7 @@ int luaD_precall (lua_State *L, StkId fu
ci->tailcalls = 0;
ci->nresults = nresults;
for (st = L->top; st < ci->top; st++)
- setnilvalue(st);
+ setnilvalue(L, st);
L->top = ci->top;
if (L->hookmask & LUA_MASKCALL) {
L->savedpc++; /* hooks assume 'pc' is already incremented */
@@ -354,8 +354,8 @@ int luaD_poscall (lua_State *L, StkId fi
for (i = wanted; i != 0 && firstResult < L->top; i--)
setobjs2s(L, res++, firstResult++);
while (i-- > 0)
- setnilvalue(res++);
- L->top = res;
+ setnilvalue(L, res++);
+ setlvmtop(L, res);
return (wanted - LUA_MULTRET); /* 0 iff wanted == LUA_MULTRET */
}
@@ -463,8 +463,12 @@ int luaD_pcall (lua_State *L, Pfunc func
status = luaD_rawrunprotected(L, func, u);
if (status != 0) { /* an error occurred? */
StkId oldtop = restorestack(L, old_top);
+ StkId curtop = L->top;
+ int i;
luaF_close(L, oldtop); /* close eventual pending closures */
luaD_seterrorobj(L, status, oldtop);
+ for (i = (curtop - L->top); i-- > 0;)
+ setnilvalue(L, L->top + i);
L->nCcalls = oldnCcalls;
L->ci = restoreci(L, old_ci);
L->base = L->ci->base;
--- a/src/lfunc.c
+++ b/src/lfunc.c
@@ -17,7 +17,7 @@
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
-
+#include "lvm.h"
Closure *luaF_newCclosure (lua_State *L, int nelems, Table *e) {
@@ -45,7 +45,7 @@ UpVal *luaF_newupval (lua_State *L) {
UpVal *uv = luaM_new(L, UpVal);
luaC_link(L, obj2gco(uv), LUA_TUPVAL);
uv->v = &uv->u.value;
- setnilvalue(uv->v);
+ setnilvalue(L, uv->v);
return uv;
}
@@ -67,8 +67,14 @@ UpVal *luaF_findupval (lua_State *L, Stk
uv = luaM_new(L, UpVal); /* not found: create a new one */
uv->tt = LUA_TUPVAL;
uv->marked = luaC_white(g);
- uv->v = level; /* current value lives in the stack */
+ uv->v = luaV_ref(level); /* current value lives in the stack */
uv->next = *pp; /* chain it in the proper position */
+ if (uv->next) {
+ uv->prev = uv->next->gch.prev;
+ uv->next->gch.prev = (GCObject *)uv;
+ } else {
+ uv->prev = NULL;
+ }
*pp = obj2gco(uv);
uv->u.l.prev = &g->uvhead; /* double link it in `uvhead' list */
uv->u.l.next = g->uvhead.u.l.next;
--- a/src/lgc.c
+++ b/src/lgc.c
@@ -21,6 +21,7 @@
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"
+#include "lvm.h"
#define GCSTEPSIZE 1024u
@@ -265,7 +266,7 @@ static void traversestack (global_State
for (o = l->stack; o < l->top; o++)
markvalue(g, o);
for (; o <= lim; o++)
- setnilvalue(o);
+ setnilvalue(l, o);
checkstacksizes(l, lim);
}
@@ -348,7 +349,7 @@ static int iscleared (const TValue *o, i
/*
** clear collected entries from weaktables
*/
-static void cleartable (GCObject *l) {
+static void cleartable (lua_State *L, GCObject *l) {
while (l) {
Table *h = gco2h(l);
int i = h->sizearray;
@@ -358,7 +359,7 @@ static void cleartable (GCObject *l) {
while (i--) {
TValue *o = &h->array[i];
if (iscleared(o, 0)) /* value was collected? */
- setnilvalue(o); /* remove value */
+ setnilvalue(L, o); /* remove value */
}
}
i = sizenode(h);
@@ -366,7 +367,7 @@ static void cleartable (GCObject *l) {
Node *n = gnode(h, i);
if (!ttisnil(gval(n)) && /* non-empty entry? */
(iscleared(key2tval(n), 1) || iscleared(gval(n), 0))) {
- setnilvalue(gval(n)); /* remove value ... */
+ setnilvalue(L, gval(n)); /* remove value ... */
removeentry(n); /* remove entry from table */
}
}
@@ -375,7 +376,7 @@ static void cleartable (GCObject *l) {
}
-static void freeobj (lua_State *L, GCObject *o) {
+void luaC_freeobj (lua_State *L, GCObject *o) {
switch (o->gch.tt) {
case LUA_TPROTO: luaF_freeproto(L, gco2p(o)); break;
case LUA_TFUNCTION: luaF_freeclosure(L, gco2cl(o)); break;
@@ -418,10 +419,12 @@ static GCObject **sweeplist (lua_State *
}
else { /* must erase `curr' */
lua_assert(isdead(g, curr) || deadmask == bitmask(SFIXEDBIT));
+ if (curr->gch.next)
+ curr->gch.next->gch.prev = curr->gch.prev;
*p = curr->gch.next;
if (curr == g->rootgc) /* is the first element of the list? */
g->rootgc = curr->gch.next; /* adjust first */
- freeobj(L, curr);
+ luaC_freeobj(L, curr);
}
}
return p;
@@ -543,7 +546,7 @@ static void atomic (lua_State *L) {
udsize = luaC_separateudata(L, 0); /* separate userdata to be finalized */
marktmu(g); /* mark `preserved' userdata */
udsize += propagateall(g); /* remark, to propagate `preserveness' */
- cleartable(g->weak); /* remove collected objects from weak tables */
+ cleartable(L, g->weak); /* remove collected objects from weak tables */
/* flip current white */
g->currentwhite = cast_byte(otherwhite(g));
g->sweepstrgc = 0;
@@ -685,8 +688,11 @@ void luaC_barrierback (lua_State *L, Tab
void luaC_link (lua_State *L, GCObject *o, lu_byte tt) {
global_State *g = G(L);
+ o->gch.prev = (GCObject*)&g->rootgc;
o->gch.next = g->rootgc;
g->rootgc = o;
+ if (o->gch.next)
+ o->gch.next->gch.prev = o;
o->gch.marked = luaC_white(g);
o->gch.tt = tt;
}
--- a/src/lgc.h
+++ b/src/lgc.h
@@ -105,6 +105,6 @@ LUAI_FUNC void luaC_link (lua_State *L,
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_freeobj (lua_State *L, GCObject *o);
#endif
--- a/src/lmem.c
+++ b/src/lmem.c
@@ -6,6 +6,7 @@
#include <stddef.h>
+#include <string.h>
#define lmem_c
#define LUA_CORE
@@ -80,6 +81,8 @@ void *luaM_realloc_ (lua_State *L, void
if (block == NULL && nsize > 0)
luaD_throw(L, LUA_ERRMEM);
lua_assert((nsize == 0) == (block == NULL));
+ if (nsize > osize)
+ memset((char *)block + osize, 0, nsize - osize);
g->totalbytes = (g->totalbytes - osize) + nsize;
return block;
}
--- a/src/lobject.h
+++ b/src/lobject.h
@@ -44,7 +44,7 @@ typedef union GCObject GCObject;
** Common Header for all collectable objects (in macro form, to be
** included in other objects)
*/
-#define CommonHeader GCObject *next; lu_byte tt; lu_byte marked
+#define CommonHeader GCObject *next; GCObject *prev; lu_byte tt; lu_byte marked
/*
@@ -83,6 +83,7 @@ typedef struct lua_TValue {
TValuefields;
} TValue;
+#define tvinit() { .value.b = 0, .tt = 0 }
/* Macros to test type */
#define ttisnil(o) (ttype(o) == LUA_TNIL)
@@ -145,15 +146,15 @@ typedef struct lua_TValue {
/* Macros to set values */
-#define setnilvalue(obj) ((obj)->tt=LUA_TNIL)
+#define setnilvalue(L, obj) (luaV_unref(L, (obj))->tt=LUA_TNIL)
/* Must not have side effects, 'x' may be expression.
*/
#define setivalue(obj,x) \
- { TValue *i_o=(obj); i_o->value.i=(x); i_o->tt=LUA_TINT; }
+ { TValue *i_o=luaV_unref(L, (obj)); i_o->value.i=(x); i_o->tt=LUA_TINT; }
# define setnvalue(obj,x) \
- { TValue *i_o=(obj); i_o->value.n= (x); i_o->tt=LUA_TNUMBER; }
+ { TValue *i_o=luaV_unref(L, (obj)); i_o->value.n= (x); i_o->tt=LUA_TNUMBER; }
/* Note: Complex always has "inline", both are C99.
*/
@@ -170,45 +171,45 @@ typedef struct lua_TValue {
#define setpvalue(obj,x) \
- { TValue *i_o=(obj); i_o->value.p=(x); i_o->tt=LUA_TLIGHTUSERDATA; }
+ { TValue *i_o=luaV_unref(L, (obj)); i_o->value.p=(x); i_o->tt=LUA_TLIGHTUSERDATA; }
#define setbvalue(obj,x) \
- { TValue *i_o=(obj); i_o->value.b=(x); i_o->tt=LUA_TBOOLEAN; }
+ { TValue *i_o=luaV_unref(L, (obj)); i_o->value.b=(x); i_o->tt=LUA_TBOOLEAN; }
#define setsvalue(L,obj,x) \
- { TValue *i_o=(obj); \
- i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TSTRING; \
+ { TValue *i_o=(obj); TString *val=(x); luaS_ref(val); luaV_unref(L, obj); \
+ i_o->value.gc=cast(GCObject *, (val)); i_o->tt=LUA_TSTRING; \
checkliveness(G(L),i_o); }
#define setuvalue(L,obj,x) \
- { TValue *i_o=(obj); \
+ { TValue *i_o=luaV_unref(L, (obj)); \
i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TUSERDATA; \
checkliveness(G(L),i_o); }
#define setthvalue(L,obj,x) \
- { TValue *i_o=(obj); \
+ { TValue *i_o=luaV_unref(L, (obj)); \
i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TTHREAD; \
checkliveness(G(L),i_o); }
#define setclvalue(L,obj,x) \
- { TValue *i_o=(obj); \
+ { TValue *i_o=luaV_unref(L, (obj)); \
i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TFUNCTION; \
checkliveness(G(L),i_o); }
#define sethvalue(L,obj,x) \
- { TValue *i_o=(obj); \
+ { TValue *i_o=luaV_unref(L, (obj)); \
i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TTABLE; \
checkliveness(G(L),i_o); }
#define setptvalue(L,obj,x) \
- { TValue *i_o=(obj); \
+ { TValue *i_o=luaV_unref(L, (obj)); \
i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TPROTO; \
checkliveness(G(L),i_o); }
#define setobj(L,obj1,obj2) \
- { const TValue *o2=(obj2); TValue *o1=(obj1); \
+ do { const TValue *o2=luaV_ref((TValue *)(obj2)); TValue *o1=luaV_unref(L, (obj1)); \
o1->value = o2->value; o1->tt=o2->tt; \
- checkliveness(G(L),o1); }
+ checkliveness(G(L),o1); } while(0)
/*
@@ -253,6 +254,7 @@ typedef union TString {
lu_byte reserved;
unsigned int hash;
size_t len;
+ int refcount;
} tsv;
} TString;
@@ -409,6 +411,7 @@ typedef struct Table {
#define twoto(x) (1<<(x))
#define sizenode(t) (twoto((t)->lsizenode))
+#include "lstring.h"
#define luaO_nilobject (&luaO_nilobject_)
--- a/src/lparser.c
+++ b/src/lparser.c
@@ -24,6 +24,7 @@
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
+#include "lvm.h"
@@ -146,7 +147,7 @@ static int registerlocalvar (LexState *l
luaM_growvector(ls->L, f->locvars, fs->nlocvars, f->sizelocvars,
LocVar, SHRT_MAX, "too many local variables");
while (oldsize < f->sizelocvars) f->locvars[oldsize++].varname = NULL;
- f->locvars[fs->nlocvars].varname = varname;
+ f->locvars[fs->nlocvars].varname = luaS_ref(varname);
luaC_objbarrier(ls->L, f, varname);
return fs->nlocvars++;
}
@@ -194,7 +195,7 @@ static int indexupvalue (FuncState *fs,
luaM_growvector(fs->L, f->upvalues, f->nups, f->sizeupvalues,
TString *, MAX_INT, "");
while (oldsize < f->sizeupvalues) f->upvalues[oldsize++] = NULL;
- f->upvalues[f->nups] = name;
+ f->upvalues[f->nups] = luaS_ref(name);
luaC_objbarrier(fs->L, f, name);
lua_assert(v->k == VLOCAL || v->k == VUPVAL);
fs->upvalues[f->nups].k = cast_byte(v->k);
@@ -341,7 +342,7 @@ static void open_func (LexState *ls, Fun
fs->nlocvars = 0;
fs->nactvar = 0;
fs->bl = NULL;
- f->source = ls->source;
+ f->source = luaS_ref(ls->source);
f->maxstacksize = 2; /* registers 0/1 are always valid */
fs->h = luaH_new(L, 0, 0);
/* anchor table of constants and prototype (to avoid being collected) */
--- a/src/lstate.c
+++ b/src/lstate.c
@@ -22,6 +22,7 @@
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"
+#include "lvm.h"
#define state_size(x) (sizeof(x) + LUAI_EXTRASPACE)
@@ -52,7 +53,7 @@ static void stack_init (lua_State *L1, l
L1->stack_last = L1->stack+(L1->stacksize - EXTRA_STACK)-1;
/* initialize first ci */
L1->ci->func = L1->top;
- setnilvalue(L1->top++); /* `function' entry for this `ci' */
+ setnilvalue(L1, L1->top++); /* `function' entry for this `ci' */
L1->base = L1->ci->base = L1->top;
L1->ci->top = L1->top + LUA_MINSTACK;
}
@@ -98,7 +99,7 @@ static void preinit_state (lua_State *L,
L->base_ci = L->ci = NULL;
L->savedpc = NULL;
L->errfunc = 0;
- setnilvalue(gt(L));
+ setnilvalue(L, gt(L));
}
@@ -163,7 +164,7 @@ LUA_API lua_State *lua_newstate (lua_All
g->strt.size = 0;
g->strt.nuse = 0;
g->strt.hash = NULL;
- setnilvalue(registry(L));
+ setnilvalue(L, registry(L));
luaZ_initbuffer(L, &g->buff);
g->panic = NULL;
g->gcstate = GCSpause;
--- a/src/lstring.c
+++ b/src/lstring.c
@@ -37,6 +37,9 @@ void luaS_resize (lua_State *L, int news
int h1 = lmod(h, newsize); /* new position */
lua_assert(cast_int(h%newsize) == lmod(h, newsize));
p->gch.next = newhash[h1]; /* chain it */
+ if (p->gch.next)
+ p->gch.next->gch.prev = p;
+ p->gch.prev = NULL;
newhash[h1] = p;
p = next;
}
@@ -59,11 +62,15 @@ static TString *newlstr (lua_State *L, c
ts->tsv.marked = luaC_white(G(L));
ts->tsv.tt = LUA_TSTRING;
ts->tsv.reserved = 0;
+ ts->tsv.refcount = 0;
memcpy(ts+1, str, l*sizeof(char));
((char *)(ts+1))[l] = '\0'; /* ending 0 */
tb = &G(L)->strt;
h = lmod(h, tb->size);
ts->tsv.next = tb->hash[h]; /* chain new entry */
+ if (ts->tsv.next)
+ ts->tsv.next->gch.prev = (GCObject *)ts;
+ ts->tsv.prev = NULL;
tb->hash[h] = obj2gco(ts);
tb->nuse++;
if (tb->nuse > cast(lu_int32, tb->size) && tb->size <= MAX_INT/2)
@@ -109,3 +116,29 @@ Udata *luaS_newudata (lua_State *L, size
return u;
}
+void luaS_unref(lua_State *L, TString *ts) {
+ if (!L || !ts)
+ return;
+ if (testbit(ts->tsv.marked, FIXEDBIT))
+ return;
+ ts->tsv.refcount--;
+ if (ts->tsv.refcount < 0) {
+ fprintf(stderr, "REFCOUNT BUG, COUNT=%d, str=%s, len=%d\n", ts->tsv.refcount, (char *) (ts + 1), (int) ts->tsv.len);
+ } else if (ts->tsv.refcount)
+ return;
+
+ if (ts->tsv.prev) {
+ ts->tsv.prev->gch.next = ts->tsv.next;
+ } else {
+ unsigned int idx = lmod(ts->tsv.hash, G(L)->strt.size);
+ lua_assert(G(L)->strt.hash[index] == (GCObject*)ts);
+ G(L)->strt.hash[idx] = ts->tsv.next;
+ }
+
+ if (ts->tsv.next)
+ ts->tsv.next->gch.prev = ts->tsv.prev;
+
+ luaC_freeobj(L, (GCObject *) ts);
+}
+
+
--- a/src/lstring.h
+++ b/src/lstring.h
@@ -7,7 +7,7 @@
#ifndef lstring_h
#define lstring_h
-
+#include <stdio.h>
#include "lgc.h"
#include "lobject.h"
#include "lstate.h"
@@ -23,6 +23,12 @@
#define luaS_fix(s) l_setbit((s)->tsv.marked, FIXEDBIT)
+static inline TString *luaS_ref(TString *ts) {
+ ts->tsv.refcount++;
+ return ts;
+}
+
+LUA_API void luaS_unref(lua_State *L, TString *ts);
LUAI_FUNC void luaS_resize (lua_State *L, int newsize);
LUAI_FUNC Udata *luaS_newudata (lua_State *L, size_t s, Table *e);
LUA_API TString *luaS_newlstr (lua_State *L, const char *str, size_t l);
--- a/src/ltable.c
+++ b/src/ltable.c
@@ -34,6 +34,7 @@
#include "lstate.h"
#include "ltable.h"
#include "lnum.h"
+#include "lvm.h"
/*
@@ -278,7 +279,7 @@ static void setarrayvector (lua_State *L
int i;
luaM_reallocvector(L, t->array, t->sizearray, size, TValue);
for (i=t->sizearray; i<size; i++)
- setnilvalue(&t->array[i]);
+ setnilvalue(L, &t->array[i]);
t->sizearray = size;
}
@@ -299,8 +300,8 @@ static void setnodevector (lua_State *L,
for (i=0; i<size; i++) {
Node *n = gnode(t, i);
gnext(n) = NULL;
- setnilvalue(gkey(n));
- setnilvalue(gval(n));
+ setnilvalue(L, gkey(n));
+ setnilvalue(L, gval(n));
}
}
t->lsizenode = cast_byte(lsize);
@@ -427,9 +428,11 @@ static TValue *newkey (lua_State *L, Tab
othern = gnext(othern); /* find previous */
}
gnext(othern) = n; /* redo the chain with `n' in place of `mp' */
+ luaV_ref((TValue *) gkey(mp));
+ luaV_ref(gval(mp));
*n = *mp; /* copy colliding node into free pos. (mp->next also goes) */
gnext(mp) = NULL; /* now `mp' is free */
- setnilvalue(gval(mp));
+ setnilvalue(L, gval(mp));
}
else { /* colliding node is in its own main position */
/* new node will go into free position */
@@ -438,6 +441,7 @@ static TValue *newkey (lua_State *L, Tab
mp = n;
}
}
+ luaV_ref((TValue *) key);
gkey(mp)->value = key->value; gkey(mp)->tt = key->tt;
luaC_barriert(L, t, key);
lua_assert(ttisnil(gval(mp)));
@@ -530,7 +534,7 @@ TValue *luaH_setint (lua_State *L, Table
if (p != luaO_nilobject)
return cast(TValue *, p);
else {
- TValue k;
+ TValue k = tvinit();
setivalue(&k, key);
return newkey(L, t, &k);
}
@@ -542,7 +546,7 @@ TValue *luaH_setstr (lua_State *L, Table
if (p != luaO_nilobject)
return cast(TValue *, p);
else {
- TValue k;
+ TValue k = tvinit();
setsvalue(L, &k, key);
return newkey(L, t, &k);
}
--- a/src/luac.c
+++ b/src/luac.c
@@ -20,8 +20,9 @@
#include "lmem.h"
#include "lobject.h"
#include "lopcodes.h"
-#include "lstring.h"
#include "lundump.h"
+#include "lvm.h"
+#include "lstring.h"
#define PROGNAME "luac" /* default program name */
#define OUTPUT PROGNAME ".out" /* default output file */
--- a/src/lundump.c
+++ b/src/lundump.c
@@ -19,6 +19,7 @@
#include "lstring.h"
#include "lundump.h"
#include "lzio.h"
+#include "lvm.h"
typedef struct {
lua_State* L;
@@ -133,7 +134,7 @@ static TString* LoadString(LoadState* S)
{
char* s=luaZ_openspace(S->L,S->b,size);
LoadBlock(S,s,size);
- return luaS_newlstr(S->L,s,size-1); /* remove trailing '\0' */
+ return luaS_ref(luaS_newlstr(S->L,s,size-1)); /* remove trailing '\0' */
}
}
@@ -149,11 +150,12 @@ static Proto* LoadFunction(LoadState* S,
static void LoadConstants(LoadState* S, Proto* f)
{
+ lua_State *L = S->L;
int i,n;
n=LoadInt(S);
f->k=luaM_newvector(S->L,n,TValue);
f->sizek=n;
- for (i=0; i<n; i++) setnilvalue(&f->k[i]);
+ for (i=0; i<n; i++) setnilvalue(L, &f->k[i]);
for (i=0; i<n; i++)
{
TValue* o=&f->k[i];
@@ -161,7 +163,7 @@ static void LoadConstants(LoadState* S,
switch (t)
{
case LUA_TNIL:
- setnilvalue(o);
+ setnilvalue(L, o);
break;
case LUA_TBOOLEAN:
setbvalue(o,LoadChar(S)!=0);
@@ -229,6 +231,7 @@ static Proto* LoadFunction(LoadState* S,
LoadDebug(S,f);
IF (!luaG_checkcode(f), "bad code");
S->L->top--;
+ setnilvalue(S->L, S->L->top);
S->L->nCcalls--;
return f;
}
--- a/src/lvm.c
+++ b/src/lvm.c
@@ -39,6 +39,7 @@
* If 'obj' is a string, it is tried to be interpreted as a number.
*/
const TValue *luaV_tonumber ( const TValue *obj, TValue *n) {
+ lua_State *L = NULL; /* FIXME */
lua_Number d;
lua_Integer i;
@@ -384,6 +385,7 @@ void luaV_concat (lua_State *L, int tota
size_t l = tsvalue(top-i)->len;
memcpy(buffer+tl, svalue(top-i), l);
tl += l;
+ setnilvalue(L, top - i);
}
setsvalue2s(L, top-n, luaS_newlstr(L, buffer, tl));
}
@@ -420,7 +422,7 @@ void luaV_concat (lua_State *L, int tota
*/
static void Arith (lua_State *L, StkId ra, const TValue *rb,
const TValue *rc, TMS op) {
- TValue tempb, tempc;
+ TValue tempb = tvinit(), tempc = tvinit();
const TValue *b, *c;
lua_Number nb,nc;
@@ -663,7 +665,7 @@ void luaV_execute (lua_State *L, int nex
OPCODE_TARGET(LOADNIL) {
TValue *rb = RB(i);
do {
- setnilvalue(rb--);
+ setnilvalue(L, rb--);
} while (rb >= ra);
continue;
}
@@ -673,7 +675,7 @@ void luaV_execute (lua_State *L, int nex
continue;
}
OPCODE_TARGET(GETGLOBAL) {
- TValue g;
+ TValue g = tvinit();
TValue *rb = KBx(i);
sethvalue(L, &g, cl->env);
lua_assert(ttisstring(rb));
@@ -685,7 +687,7 @@ void luaV_execute (lua_State *L, int nex
continue;
}
OPCODE_TARGET(SETGLOBAL) {
- TValue g;
+ TValue g = tvinit();
sethvalue(L, &g, cl->env);
lua_assert(ttisstring(KBx(i)));
Protect(luaV_settable(L, &g, KBx(i), ra));
@@ -895,7 +897,7 @@ void luaV_execute (lua_State *L, int nex
if (--nexeccalls == 0) /* was previous function running `here'? */
return; /* no: return */
else { /* yes: continue its execution */
- if (b) L->top = L->ci->top;
+ if (b) setlvmtop(L, L->ci->top);
lua_assert(isLua(L->ci));
lua_assert(GET_OPCODE(*((L->ci)->savedpc - 1)) == OP_CALL);
goto reentry;
@@ -986,6 +988,7 @@ void luaV_execute (lua_State *L, int nex
for (; n > 0; n--) {
TValue *val = ra+n;
setobj2t(L, luaH_setint(L, h, last--), val);
+ setnilvalue(L, val);
luaC_barriert(L, h, val);
}
continue;
@@ -1030,7 +1033,7 @@ void luaV_execute (lua_State *L, int nex
setobjs2s(L, ra + j, ci->base - n + j);
}
else {
- setnilvalue(ra + j);
+ setnilvalue(L, ra + j);
}
}
continue;
--- a/src/lvm.h
+++ b/src/lvm.h
@@ -11,6 +11,7 @@
#include "ldo.h"
#include "lobject.h"
#include "ltm.h"
+#include "lstring.h"
#define tostring(L,o) ((ttype(o) == LUA_TSTRING) || (luaV_tostring(L, o)))
@@ -19,6 +20,19 @@
#define equalobj(L,o1,o2) (ttype_ext_same(o1,o2) && luaV_equalval(L, o1, o2))
+static inline TValue *luaV_ref(TValue *tv)
+{
+ if (ttisstring(tv))
+ luaS_ref(rawtsvalue(tv));
+ return tv;
+}
+
+static inline TValue *luaV_unref(lua_State *L, TValue *tv)
+{
+ if (ttisstring(tv))
+ luaS_unref(L, rawtsvalue(tv));
+ return tv;
+}
LUAI_FUNC int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r);
LUAI_FUNC int luaV_equalval (lua_State *L, const TValue *t1, const TValue *t2);
--- a/src/llex.c
+++ b/src/llex.c
@@ -23,6 +23,7 @@
#include "ltable.h"
#include "lzio.h"
#include "lnum.h"
+#include "lvm.h"
@@ -69,7 +70,7 @@ static void save (LexState *ls, int c) {
void luaX_init (lua_State *L) {
int i;
for (i=0; i<NUM_RESERVED; i++) {
- TString *ts = luaS_new(L, luaX_tokens[i]);
+ TString *ts = luaS_ref(luaS_new(L, luaX_tokens[i]));
luaS_fix(ts); /* reserved words are never collected */
lua_assert(strlen(luaX_tokens[i])+1 <= TOKEN_LEN);
ts->tsv.reserved = cast_byte(i+1); /* reserved word */
@@ -125,7 +126,7 @@ void luaX_syntaxerror (LexState *ls, con
TString *luaX_newstring (LexState *ls, const char *str, size_t l) {
lua_State *L = ls->L;
- TString *ts = luaS_newlstr(L, str, l);
+ TString *ts = luaS_ref(luaS_newlstr(L, str, l));
TValue *o = luaH_setstr(L, ls->fs->h, ts); /* entry for `str' */
if (ttisnil(o))
setbvalue(o, 1); /* make sure `str' will not be collected */
@@ -152,7 +153,7 @@ void luaX_setinput (lua_State *L, LexSta
ls->fs = NULL;
ls->linenumber = 1;
ls->lastline = 1;
- ls->source = source;
+ ls->source = luaS_ref(source);
luaZ_resizebuffer(ls->L, ls->buff, LUA_MINBUFFER); /* initialize buffer */
next(ls); /* read first char */
}
--- a/src/lstate.h
+++ b/src/lstate.h
@@ -144,6 +144,13 @@ union GCObject {
struct lua_State th; /* thread */
};
+#define setlvmtop(L, val) do { \
+ int __i; \
+ for (__i = L->top - val; __i-- > 0;) \
+ setnilvalue(L, val + __i); \
+ L->top = val; \
+} while (0)
+
/* macros to convert a GCObject into a specific value */
#define rawgco2ts(o) check_exp((o)->gch.tt == LUA_TSTRING, &((o)->ts))
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