int lj_lib_postreg(lua_State *L, lua_CFunction cf, int id, const char *name)
{
GCfunc *fn = lj_lib_pushcf(L, cf, id);
GCtab *t = tabref(curr_func(L)->c.env); /* Reference to parent table. */
setfuncV(L, lj_tab_setstr(L, t, lj_str_newz(L, name)), fn);
lj_gc_anybarriert(L, t);
setfuncV(L, L->top++, fn);
return 1;
}
ptrdiff_t lj_vmevent_prepare(lua_State *L, VMEvent ev)
{
global_State *g = G(L);
GCstr *s = lj_str_newlit(L, LJ_VMEVENTS_REGKEY);
cTValue *tv = lj_tab_getstr(tabV(registry(L)), s);
if (tvistab(tv)) {
int hash = VMEVENT_HASH(ev);
tv = lj_tab_getint(tabV(tv), hash);
if (tv && tvisfunc(tv)) {
lj_state_checkstack(L, LUA_MINSTACK);
setfuncV(L, L->top++, funcV(tv));
return savestack(L, L->top);
}
}
g->vmevmask &= ~VMEVENT_MASK(ev); /* No handler: cache this fact. */
return 0;
}
static TValue *cpparser(lua_State *L, lua_CFunction dummy, void *ud)
{
LexState *ls = (LexState *)ud;
GCproto *pt;
GCfunc *fn;
int bc;
UNUSED(dummy);
cframe_errfunc(L->cframe) = -1; /* Inherit error function. */
bc = lj_lex_setup(L, ls);
if (ls->mode && !strchr(ls->mode, bc ? 'b' : 't')) {
setstrV(L, L->top++, lj_err_str(L, LJ_ERR_XMODE));
lj_err_throw(L, LUA_ERRSYNTAX);
}
pt = bc ? lj_bcread(ls) : lj_parse(ls);
fn = lj_func_newL_empty(L, pt, tabref(L->env));
/* Don't combine above/below into one statement. */
setfuncV(L, L->top++, fn);
return NULL;
}
static const uint8_t *lib_read_lfunc(lua_State *L, const uint8_t *p, GCtab *tab)
{
int len = *p++;
GCstr *name = lj_str_new(L, (const char *)p, len);
LexState ls;
GCproto *pt;
GCfunc *fn;
memset(&ls, 0, sizeof(ls));
ls.L = L;
ls.p = (const char *)(p+len);
ls.pe = (const char *)~(uintptr_t)0;
ls.c = -1;
ls.level = (BCDUMP_F_STRIP|(LJ_BE*BCDUMP_F_BE));
ls.chunkname = name;
pt = lj_bcread_proto(&ls);
pt->firstline = ~(BCLine)0;
fn = lj_func_newL_empty(L, pt, tabref(L->env));
/* NOBARRIER: See below for common barrier. */
setfuncV(L, lj_tab_setstr(L, tab, name), fn);
return (const uint8_t *)ls.p;
}
static void jit_profile_callback(lua_State *L2, lua_State *L, int samples,
int vmstate)
{
TValue key;
cTValue *tv;
setlightudV(&key, (void *)&KEY_PROFILE_FUNC);
tv = lj_tab_get(L, tabV(registry(L)), &key);
if (tvisfunc(tv)) {
char vmst = (char)vmstate;
int status;
setfuncV(L2, L2->top++, funcV(tv));
setthreadV(L2, L2->top++, L);
setintV(L2->top++, samples);
setstrV(L2, L2->top++, lj_str_new(L2, &vmst, 1));
status = lua_pcall(L2, 3, 0, 0); /* callback(thread, samples, vmstate) */
if (status) {
if (G(L2)->panic) G(L2)->panic(L2);
exit(EXIT_FAILURE);
}
lj_trace_abort(G(L2));
}
}
/* C functions can have arbitrary side-effects and are not recorded (yet). */
static void LJ_FASTCALL recff_c(jit_State *J, RecordFFData *rd)
{
setfuncV(J->L, &J->errinfo, J->fn);
lj_trace_err_info(J, LJ_TRERR_NYICF);
UNUSED(rd);
}
/* Throw error for unsupported variant of fast function. */
LJ_NORET static void recff_nyiu(jit_State *J)
{
setfuncV(J->L, &J->errinfo, J->fn);
lj_trace_err_info(J, LJ_TRERR_NYIFFU);
}
void lj_lib_register(lua_State *L, const char *libname,
const uint8_t *p, const lua_CFunction *cf)
{
GCtab *env = tabref(L->env);
GCfunc *ofn = NULL;
int ffid = *p++;
BCIns *bcff = &L2GG(L)->bcff[*p++];
GCtab *tab = lib_create_table(L, libname, *p++);
ptrdiff_t tpos = L->top - L->base;
/* Avoid barriers further down. */
lj_gc_anybarriert(L, tab);
tab->nomm = 0;
for (;;) {
uint32_t tag = *p++;
MSize len = tag & LIBINIT_LENMASK;
tag &= LIBINIT_TAGMASK;
if (tag != LIBINIT_STRING) {
const char *name;
MSize nuv = (MSize)(L->top - L->base - tpos);
GCfunc *fn = lj_func_newC(L, nuv, env);
if (nuv) {
L->top = L->base + tpos;
memcpy(fn->c.upvalue, L->top, sizeof(TValue)*nuv);
}
fn->c.ffid = (uint8_t)(ffid++);
name = (const char *)p;
p += len;
if (tag == LIBINIT_CF)
setmref(fn->c.pc, &G(L)->bc_cfunc_int);
else
setmref(fn->c.pc, bcff++);
if (tag == LIBINIT_ASM_)
fn->c.f = ofn->c.f; /* Copy handler from previous function. */
else
fn->c.f = *cf++; /* Get cf or handler from C function table. */
if (len) {
/* NOBARRIER: See above for common barrier. */
setfuncV(L, lj_tab_setstr(L, tab, lj_str_new(L, name, len)), fn);
}
ofn = fn;
} else {
switch (tag | len) {
case LIBINIT_SET:
L->top -= 2;
if (tvisstr(L->top+1) && strV(L->top+1)->len == 0)
env = tabV(L->top);
else /* NOBARRIER: See above for common barrier. */
copyTV(L, lj_tab_set(L, tab, L->top+1), L->top);
break;
case LIBINIT_NUMBER:
memcpy(&L->top->n, p, sizeof(double));
L->top++;
p += sizeof(double);
break;
case LIBINIT_COPY:
copyTV(L, L->top, L->top - *p++);
L->top++;
break;
case LIBINIT_LASTCL:
setfuncV(L, L->top++, ofn);
break;
case LIBINIT_FFID:
ffid++;
break;
case LIBINIT_END:
return;
default:
setstrV(L, L->top++, lj_str_new(L, (const char *)p, len));
p += len;
break;
}
}
}
}
