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upvalue barriers for Lua functions must act on the upvalue itself,

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not on its closure
This commit is contained in:
Roberto Ierusalimschy 2010-04-20 17:14:50 -03:00
parent 376e939ef6
commit ed720d09f3
1 changed files with 10 additions and 6 deletions
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16
lapi.c
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@ -1,5 +1,5 @@
/*
** $Id: lapi.c,v 2.122 2010/04/18 13:22:48 roberto Exp roberto $
** $Id: lapi.c,v 2.123 2010/04/19 16:33:19 roberto Exp roberto $
** Lua API
** See Copyright Notice in lua.h
*/
@ -874,7 +874,7 @@ LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data,
const TValue *gt = luaH_getint(reg, LUA_RIDX_GLOBALS);
/* set global table as 1st upvalue of 'f' (may be _ENV) */
setobj(L, f->l.upvals[0]->v, gt);
luaC_barrier(L, f, gt);
luaC_barrier(L, f->l.upvals[0], gt);
}
}
lua_unlock(L);
@ -1073,19 +1073,22 @@ LUA_API void *lua_newuserdata (lua_State *L, size_t size) {
static const char *aux_upvalue (StkId fi, int n, TValue **val) {
static const char *aux_upvalue (StkId fi, int n, TValue **val,
GCObject **owner) {
Closure *f;
if (!ttisclosure(fi)) return NULL;
f = clvalue(fi);
if (f->c.isC) {
if (!(1 <= n && n <= f->c.nupvalues)) return NULL;
*val = &f->c.upvalue[n-1];
if (owner) *owner = obj2gco(f);
return "";
}
else {
Proto *p = f->l.p;
if (!(1 <= n && n <= p->sizeupvalues)) return NULL;
*val = f->l.upvals[n-1]->v;
if (owner) *owner = obj2gco(f->l.upvals[n - 1]);
return getstr(p->upvalues[n-1].name);
}
}
@ -1095,7 +1098,7 @@ LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) {
const char *name;
TValue *val;
lua_lock(L);
name = aux_upvalue(index2addr(L, funcindex), n, &val);
name = aux_upvalue(index2addr(L, funcindex), n, &val, NULL);
if (name) {
setobj2s(L, L->top, val);
api_incr_top(L);
@ -1108,15 +1111,16 @@ LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) {
LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n) {
const char *name;
TValue *val;
GCObject *owner;
StkId fi;
lua_lock(L);
fi = index2addr(L, funcindex);
api_checknelems(L, 1);
name = aux_upvalue(fi, n, &val);
name = aux_upvalue(fi, n, &val, &owner);
if (name) {
L->top--;
setobj(L, val, L->top);
luaC_barrier(L, clvalue(fi), L->top);
luaC_barrier(L, owner, L->top);
}
lua_unlock(L);
return name;