--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/luajit/src/lj_api.c	Thu Jan 22 20:10:30 2026 -0800
@@ -0,0 +1,1313 @@
+/*
+** Public Lua/C API.
+** Copyright (C) 2005-2023 Mike Pall. See Copyright Notice in luajit.h
+**
+** Major portions taken verbatim or adapted from the Lua interpreter.
+** Copyright (C) 1994-2008 Lua.org, PUC-Rio. See Copyright Notice in lua.h
+*/
+
+#define lj_api_c
+#define LUA_CORE
+
+#include "lj_obj.h"
+#include "lj_gc.h"
+#include "lj_err.h"
+#include "lj_debug.h"
+#include "lj_str.h"
+#include "lj_tab.h"
+#include "lj_func.h"
+#include "lj_udata.h"
+#include "lj_meta.h"
+#include "lj_state.h"
+#include "lj_bc.h"
+#include "lj_frame.h"
+#include "lj_trace.h"
+#include "lj_vm.h"
+#include "lj_strscan.h"
+#include "lj_strfmt.h"
+
+/* -- Common helper functions --------------------------------------------- */
+
+#define lj_checkapi_slot(idx) \
+  lj_checkapi((idx) <= (L->top - L->base), "stack slot %d out of range", (idx))
+
+static TValue *index2adr(lua_State *L, int idx)
+{
+  if (idx > 0) {
+    TValue *o = L->base + (idx - 1);
+    return o < L->top ? o : niltv(L);
+  } else if (idx > LUA_REGISTRYINDEX) {
+    lj_checkapi(idx != 0 && -idx <= L->top - L->base,
+		"bad stack slot %d", idx);
+    return L->top + idx;
+  } else if (idx == LUA_GLOBALSINDEX) {
+    TValue *o = &G(L)->tmptv;
+    settabV(L, o, tabref(L->env));
+    return o;
+  } else if (idx == LUA_REGISTRYINDEX) {
+    return registry(L);
+  } else {
+    GCfunc *fn = curr_func(L);
+    lj_checkapi(fn->c.gct == ~LJ_TFUNC && !isluafunc(fn),
+		"calling frame is not a C function");
+    if (idx == LUA_ENVIRONINDEX) {
+      TValue *o = &G(L)->tmptv;
+      settabV(L, o, tabref(fn->c.env));
+      return o;
+    } else {
+      idx = LUA_GLOBALSINDEX - idx;
+      return idx <= fn->c.nupvalues ? &fn->c.upvalue[idx-1] : niltv(L);
+    }
+  }
+}
+
+static LJ_AINLINE TValue *index2adr_check(lua_State *L, int idx)
+{
+  TValue *o = index2adr(L, idx);
+  lj_checkapi(o != niltv(L), "invalid stack slot %d", idx);
+  return o;
+}
+
+static TValue *index2adr_stack(lua_State *L, int idx)
+{
+  if (idx > 0) {
+    TValue *o = L->base + (idx - 1);
+    if (o < L->top) {
+      return o;
+    } else {
+      lj_checkapi(0, "invalid stack slot %d", idx);
+      return niltv(L);
+    }
+    return o < L->top ? o : niltv(L);
+  } else {
+    lj_checkapi(idx != 0 && -idx <= L->top - L->base,
+		"invalid stack slot %d", idx);
+    return L->top + idx;
+  }
+}
+
+static GCtab *getcurrenv(lua_State *L)
+{
+  GCfunc *fn = curr_func(L);
+  return fn->c.gct == ~LJ_TFUNC ? tabref(fn->c.env) : tabref(L->env);
+}
+
+/* -- Miscellaneous API functions ----------------------------------------- */
+
+LUA_API int lua_status(lua_State *L)
+{
+  return L->status;
+}
+
+LUA_API int lua_checkstack(lua_State *L, int size)
+{
+  if (size > LUAI_MAXCSTACK || (L->top - L->base + size) > LUAI_MAXCSTACK) {
+    return 0;  /* Stack overflow. */
+  } else if (size > 0) {
+    lj_state_checkstack(L, (MSize)size);
+  }
+  return 1;
+}
+
+LUALIB_API void luaL_checkstack(lua_State *L, int size, const char *msg)
+{
+  if (!lua_checkstack(L, size))
+    lj_err_callerv(L, LJ_ERR_STKOVM, msg);
+}
+
+LUA_API void lua_xmove(lua_State *L, lua_State *to, int n)
+{
+  TValue *f, *t;
+  if (L == to) return;
+  lj_checkapi_slot(n);
+  lj_checkapi(G(L) == G(to), "move across global states");
+  lj_state_checkstack(to, (MSize)n);
+  f = L->top;
+  t = to->top = to->top + n;
+  while (--n >= 0) copyTV(to, --t, --f);
+  L->top = f;
+}
+
+LUA_API const lua_Number *lua_version(lua_State *L)
+{
+  static const lua_Number version = LUA_VERSION_NUM;
+  UNUSED(L);
+  return &version;
+}
+
+/* -- Stack manipulation -------------------------------------------------- */
+
+LUA_API int lua_gettop(lua_State *L)
+{
+  return (int)(L->top - L->base);
+}
+
+LUA_API void lua_settop(lua_State *L, int idx)
+{
+  if (idx >= 0) {
+    lj_checkapi(idx <= tvref(L->maxstack) - L->base, "bad stack slot %d", idx);
+    if (L->base + idx > L->top) {
+      if (L->base + idx >= tvref(L->maxstack))
+	lj_state_growstack(L, (MSize)idx - (MSize)(L->top - L->base));
+      do { setnilV(L->top++); } while (L->top < L->base + idx);
+    } else {
+      L->top = L->base + idx;
+    }
+  } else {
+    lj_checkapi(-(idx+1) <= (L->top - L->base), "bad stack slot %d", idx);
+    L->top += idx+1;  /* Shrinks top (idx < 0). */
+  }
+}
+
+LUA_API void lua_remove(lua_State *L, int idx)
+{
+  TValue *p = index2adr_stack(L, idx);
+  while (++p < L->top) copyTV(L, p-1, p);
+  L->top--;
+}
+
+LUA_API void lua_insert(lua_State *L, int idx)
+{
+  TValue *q, *p = index2adr_stack(L, idx);
+  for (q = L->top; q > p; q--) copyTV(L, q, q-1);
+  copyTV(L, p, L->top);
+}
+
+static void copy_slot(lua_State *L, TValue *f, int idx)
+{
+  if (idx == LUA_GLOBALSINDEX) {
+    lj_checkapi(tvistab(f), "stack slot %d is not a table", idx);
+    /* NOBARRIER: A thread (i.e. L) is never black. */
+    setgcref(L->env, obj2gco(tabV(f)));
+  } else if (idx == LUA_ENVIRONINDEX) {
+    GCfunc *fn = curr_func(L);
+    if (fn->c.gct != ~LJ_TFUNC)
+      lj_err_msg(L, LJ_ERR_NOENV);
+    lj_checkapi(tvistab(f), "stack slot %d is not a table", idx);
+    setgcref(fn->c.env, obj2gco(tabV(f)));
+    lj_gc_barrier(L, fn, f);
+  } else {
+    TValue *o = index2adr_check(L, idx);
+    copyTV(L, o, f);
+    if (idx < LUA_GLOBALSINDEX)  /* Need a barrier for upvalues. */
+      lj_gc_barrier(L, curr_func(L), f);
+  }
+}
+
+LUA_API void lua_replace(lua_State *L, int idx)
+{
+  lj_checkapi_slot(1);
+  copy_slot(L, L->top - 1, idx);
+  L->top--;
+}
+
+LUA_API void lua_copy(lua_State *L, int fromidx, int toidx)
+{
+  copy_slot(L, index2adr(L, fromidx), toidx);
+}
+
+LUA_API void lua_pushvalue(lua_State *L, int idx)
+{
+  copyTV(L, L->top, index2adr(L, idx));
+  incr_top(L);
+}
+
+/* -- Stack getters ------------------------------------------------------- */
+
+LUA_API int lua_type(lua_State *L, int idx)
+{
+  cTValue *o = index2adr(L, idx);
+  if (tvisnumber(o)) {
+    return LUA_TNUMBER;
+#if LJ_64 && !LJ_GC64
+  } else if (tvislightud(o)) {
+    return LUA_TLIGHTUSERDATA;
+#endif
+  } else if (o == niltv(L)) {
+    return LUA_TNONE;
+  } else {  /* Magic internal/external tag conversion. ORDER LJ_T */
+    uint32_t t = ~itype(o);
+#if LJ_64
+    int tt = (int)((U64x(75a06,98042110) >> 4*t) & 15u);
+#else
+    int tt = (int)(((t < 8 ? 0x98042110u : 0x75a06u) >> 4*(t&7)) & 15u);
+#endif
+    lj_assertL(tt != LUA_TNIL || tvisnil(o), "bad tag conversion");
+    return tt;
+  }
+}
+
+LUALIB_API void luaL_checktype(lua_State *L, int idx, int tt)
+{
+  if (lua_type(L, idx) != tt)
+    lj_err_argt(L, idx, tt);
+}
+
+LUALIB_API void luaL_checkany(lua_State *L, int idx)
+{
+  if (index2adr(L, idx) == niltv(L))
+    lj_err_arg(L, idx, LJ_ERR_NOVAL);
+}
+
+LUA_API const char *lua_typename(lua_State *L, int t)
+{
+  UNUSED(L);
+  return lj_obj_typename[t+1];
+}
+
+LUA_API int lua_iscfunction(lua_State *L, int idx)
+{
+  cTValue *o = index2adr(L, idx);
+  return tvisfunc(o) && !isluafunc(funcV(o));
+}
+
+LUA_API int lua_isnumber(lua_State *L, int idx)
+{
+  cTValue *o = index2adr(L, idx);
+  TValue tmp;
+  return (tvisnumber(o) || (tvisstr(o) && lj_strscan_number(strV(o), &tmp)));
+}
+
+LUA_API int lua_isstring(lua_State *L, int idx)
+{
+  cTValue *o = index2adr(L, idx);
+  return (tvisstr(o) || tvisnumber(o));
+}
+
+LUA_API int lua_isuserdata(lua_State *L, int idx)
+{
+  cTValue *o = index2adr(L, idx);
+  return (tvisudata(o) || tvislightud(o));
+}
+
+LUA_API int lua_rawequal(lua_State *L, int idx1, int idx2)
+{
+  cTValue *o1 = index2adr(L, idx1);
+  cTValue *o2 = index2adr(L, idx2);
+  return (o1 == niltv(L) || o2 == niltv(L)) ? 0 : lj_obj_equal(o1, o2);
+}
+
+LUA_API int lua_equal(lua_State *L, int idx1, int idx2)
+{
+  cTValue *o1 = index2adr(L, idx1);
+  cTValue *o2 = index2adr(L, idx2);
+  if (tvisint(o1) && tvisint(o2)) {
+    return intV(o1) == intV(o2);
+  } else if (tvisnumber(o1) && tvisnumber(o2)) {
+    return numberVnum(o1) == numberVnum(o2);
+  } else if (itype(o1) != itype(o2)) {
+    return 0;
+  } else if (tvispri(o1)) {
+    return o1 != niltv(L) && o2 != niltv(L);
+#if LJ_64 && !LJ_GC64
+  } else if (tvislightud(o1)) {
+    return o1->u64 == o2->u64;
+#endif
+  } else if (gcrefeq(o1->gcr, o2->gcr)) {
+    return 1;
+  } else if (!tvistabud(o1)) {
+    return 0;
+  } else {
+    TValue *base = lj_meta_equal(L, gcV(o1), gcV(o2), 0);
+    if ((uintptr_t)base <= 1) {
+      return (int)(uintptr_t)base;
+    } else {
+      L->top = base+2;
+      lj_vm_call(L, base, 1+1);
+      L->top -= 2+LJ_FR2;
+      return tvistruecond(L->top+1+LJ_FR2);
+    }
+  }
+}
+
+LUA_API int lua_lessthan(lua_State *L, int idx1, int idx2)
+{
+  cTValue *o1 = index2adr(L, idx1);
+  cTValue *o2 = index2adr(L, idx2);
+  if (o1 == niltv(L) || o2 == niltv(L)) {
+    return 0;
+  } else if (tvisint(o1) && tvisint(o2)) {
+    return intV(o1) < intV(o2);
+  } else if (tvisnumber(o1) && tvisnumber(o2)) {
+    return numberVnum(o1) < numberVnum(o2);
+  } else {
+    TValue *base = lj_meta_comp(L, o1, o2, 0);
+    if ((uintptr_t)base <= 1) {
+      return (int)(uintptr_t)base;
+    } else {
+      L->top = base+2;
+      lj_vm_call(L, base, 1+1);
+      L->top -= 2+LJ_FR2;
+      return tvistruecond(L->top+1+LJ_FR2);
+    }
+  }
+}
+
+LUA_API lua_Number lua_tonumber(lua_State *L, int idx)
+{
+  cTValue *o = index2adr(L, idx);
+  TValue tmp;
+  if (LJ_LIKELY(tvisnumber(o)))
+    return numberVnum(o);
+  else if (tvisstr(o) && lj_strscan_num(strV(o), &tmp))
+    return numV(&tmp);
+  else
+    return 0;
+}
+
+LUA_API lua_Number lua_tonumberx(lua_State *L, int idx, int *ok)
+{
+  cTValue *o = index2adr(L, idx);
+  TValue tmp;
+  if (LJ_LIKELY(tvisnumber(o))) {
+    if (ok) *ok = 1;
+    return numberVnum(o);
+  } else if (tvisstr(o) && lj_strscan_num(strV(o), &tmp)) {
+    if (ok) *ok = 1;
+    return numV(&tmp);
+  } else {
+    if (ok) *ok = 0;
+    return 0;
+  }
+}
+
+LUALIB_API lua_Number luaL_checknumber(lua_State *L, int idx)
+{
+  cTValue *o = index2adr(L, idx);
+  TValue tmp;
+  if (LJ_LIKELY(tvisnumber(o)))
+    return numberVnum(o);
+  else if (!(tvisstr(o) && lj_strscan_num(strV(o), &tmp)))
+    lj_err_argt(L, idx, LUA_TNUMBER);
+  return numV(&tmp);
+}
+
+LUALIB_API lua_Number luaL_optnumber(lua_State *L, int idx, lua_Number def)
+{
+  cTValue *o = index2adr(L, idx);
+  TValue tmp;
+  if (LJ_LIKELY(tvisnumber(o)))
+    return numberVnum(o);
+  else if (tvisnil(o))
+    return def;
+  else if (!(tvisstr(o) && lj_strscan_num(strV(o), &tmp)))
+    lj_err_argt(L, idx, LUA_TNUMBER);
+  return numV(&tmp);
+}
+
+LUA_API lua_Integer lua_tointeger(lua_State *L, int idx)
+{
+  cTValue *o = index2adr(L, idx);
+  TValue tmp;
+  lua_Number n;
+  if (LJ_LIKELY(tvisint(o))) {
+    return intV(o);
+  } else if (LJ_LIKELY(tvisnum(o))) {
+    n = numV(o);
+  } else {
+    if (!(tvisstr(o) && lj_strscan_number(strV(o), &tmp)))
+      return 0;
+    if (tvisint(&tmp))
+      return intV(&tmp);
+    n = numV(&tmp);
+  }
+#if LJ_64
+  return (lua_Integer)n;
+#else
+  return lj_num2int(n);
+#endif
+}
+
+LUA_API lua_Integer lua_tointegerx(lua_State *L, int idx, int *ok)
+{
+  cTValue *o = index2adr(L, idx);
+  TValue tmp;
+  lua_Number n;
+  if (LJ_LIKELY(tvisint(o))) {
+    if (ok) *ok = 1;
+    return intV(o);
+  } else if (LJ_LIKELY(tvisnum(o))) {
+    n = numV(o);
+  } else {
+    if (!(tvisstr(o) && lj_strscan_number(strV(o), &tmp))) {
+      if (ok) *ok = 0;
+      return 0;
+    }
+    if (tvisint(&tmp)) {
+      if (ok) *ok = 1;
+      return intV(&tmp);
+    }
+    n = numV(&tmp);
+  }
+  if (ok) *ok = 1;
+#if LJ_64
+  return (lua_Integer)n;
+#else
+  return lj_num2int(n);
+#endif
+}
+
+LUALIB_API lua_Integer luaL_checkinteger(lua_State *L, int idx)
+{
+  cTValue *o = index2adr(L, idx);
+  TValue tmp;
+  lua_Number n;
+  if (LJ_LIKELY(tvisint(o))) {
+    return intV(o);
+  } else if (LJ_LIKELY(tvisnum(o))) {
+    n = numV(o);
+  } else {
+    if (!(tvisstr(o) && lj_strscan_number(strV(o), &tmp)))
+      lj_err_argt(L, idx, LUA_TNUMBER);
+    if (tvisint(&tmp))
+      return (lua_Integer)intV(&tmp);
+    n = numV(&tmp);
+  }
+#if LJ_64
+  return (lua_Integer)n;
+#else
+  return lj_num2int(n);
+#endif
+}
+
+LUALIB_API lua_Integer luaL_optinteger(lua_State *L, int idx, lua_Integer def)
+{
+  cTValue *o = index2adr(L, idx);
+  TValue tmp;
+  lua_Number n;
+  if (LJ_LIKELY(tvisint(o))) {
+    return intV(o);
+  } else if (LJ_LIKELY(tvisnum(o))) {
+    n = numV(o);
+  } else if (tvisnil(o)) {
+    return def;
+  } else {
+    if (!(tvisstr(o) && lj_strscan_number(strV(o), &tmp)))
+      lj_err_argt(L, idx, LUA_TNUMBER);
+    if (tvisint(&tmp))
+      return (lua_Integer)intV(&tmp);
+    n = numV(&tmp);
+  }
+#if LJ_64
+  return (lua_Integer)n;
+#else
+  return lj_num2int(n);
+#endif
+}
+
+LUA_API int lua_toboolean(lua_State *L, int idx)
+{
+  cTValue *o = index2adr(L, idx);
+  return tvistruecond(o);
+}
+
+LUA_API const char *lua_tolstring(lua_State *L, int idx, size_t *len)
+{
+  TValue *o = index2adr(L, idx);
+  GCstr *s;
+  if (LJ_LIKELY(tvisstr(o))) {
+    s = strV(o);
+  } else if (tvisnumber(o)) {
+    lj_gc_check(L);
+    o = index2adr(L, idx);  /* GC may move the stack. */
+    s = lj_strfmt_number(L, o);
+    setstrV(L, o, s);
+  } else {
+    if (len != NULL) *len = 0;
+    return NULL;
+  }
+  if (len != NULL) *len = s->len;
+  return strdata(s);
+}
+
+LUALIB_API const char *luaL_checklstring(lua_State *L, int idx, size_t *len)
+{
+  TValue *o = index2adr(L, idx);
+  GCstr *s;
+  if (LJ_LIKELY(tvisstr(o))) {
+    s = strV(o);
+  } else if (tvisnumber(o)) {
+    lj_gc_check(L);
+    o = index2adr(L, idx);  /* GC may move the stack. */
+    s = lj_strfmt_number(L, o);
+    setstrV(L, o, s);
+  } else {
+    lj_err_argt(L, idx, LUA_TSTRING);
+  }
+  if (len != NULL) *len = s->len;
+  return strdata(s);
+}
+
+LUALIB_API const char *luaL_optlstring(lua_State *L, int idx,
+				       const char *def, size_t *len)
+{
+  TValue *o = index2adr(L, idx);
+  GCstr *s;
+  if (LJ_LIKELY(tvisstr(o))) {
+    s = strV(o);
+  } else if (tvisnil(o)) {
+    if (len != NULL) *len = def ? strlen(def) : 0;
+    return def;
+  } else if (tvisnumber(o)) {
+    lj_gc_check(L);
+    o = index2adr(L, idx);  /* GC may move the stack. */
+    s = lj_strfmt_number(L, o);
+    setstrV(L, o, s);
+  } else {
+    lj_err_argt(L, idx, LUA_TSTRING);
+  }
+  if (len != NULL) *len = s->len;
+  return strdata(s);
+}
+
+LUALIB_API int luaL_checkoption(lua_State *L, int idx, const char *def,
+				const char *const lst[])
+{
+  ptrdiff_t i;
+  const char *s = lua_tolstring(L, idx, NULL);
+  if (s == NULL && (s = def) == NULL)
+    lj_err_argt(L, idx, LUA_TSTRING);
+  for (i = 0; lst[i]; i++)
+    if (strcmp(lst[i], s) == 0)
+      return (int)i;
+  lj_err_argv(L, idx, LJ_ERR_INVOPTM, s);
+}
+
+LUA_API size_t lua_objlen(lua_State *L, int idx)
+{
+  TValue *o = index2adr(L, idx);
+  if (tvisstr(o)) {
+    return strV(o)->len;
+  } else if (tvistab(o)) {
+    return (size_t)lj_tab_len(tabV(o));
+  } else if (tvisudata(o)) {
+    return udataV(o)->len;
+  } else if (tvisnumber(o)) {
+    GCstr *s = lj_strfmt_number(L, o);
+    setstrV(L, o, s);
+    return s->len;
+  } else {
+    return 0;
+  }
+}
+
+LUA_API lua_CFunction lua_tocfunction(lua_State *L, int idx)
+{
+  cTValue *o = index2adr(L, idx);
+  if (tvisfunc(o)) {
+    BCOp op = bc_op(*mref(funcV(o)->c.pc, BCIns));
+    if (op == BC_FUNCC || op == BC_FUNCCW)
+      return funcV(o)->c.f;
+  }
+  return NULL;
+}
+
+LUA_API void *lua_touserdata(lua_State *L, int idx)
+{
+  cTValue *o = index2adr(L, idx);
+  if (tvisudata(o))
+    return uddata(udataV(o));
+  else if (tvislightud(o))
+    return lightudV(G(L), o);
+  else
+    return NULL;
+}
+
+LUA_API lua_State *lua_tothread(lua_State *L, int idx)
+{
+  cTValue *o = index2adr(L, idx);
+  return (!tvisthread(o)) ? NULL : threadV(o);
+}
+
+LUA_API const void *lua_topointer(lua_State *L, int idx)
+{
+  return lj_obj_ptr(G(L), index2adr(L, idx));
+}
+
+/* -- Stack setters (object creation) ------------------------------------- */
+
+LUA_API void lua_pushnil(lua_State *L)
+{
+  setnilV(L->top);
+  incr_top(L);
+}
+
+LUA_API void lua_pushnumber(lua_State *L, lua_Number n)
+{
+  setnumV(L->top, n);
+  if (LJ_UNLIKELY(tvisnan(L->top)))
+    setnanV(L->top);  /* Canonicalize injected NaNs. */
+  incr_top(L);
+}
+
+LUA_API void lua_pushinteger(lua_State *L, lua_Integer n)
+{
+  setintptrV(L->top, n);
+  incr_top(L);
+}
+
+LUA_API void lua_pushlstring(lua_State *L, const char *str, size_t len)
+{
+  GCstr *s;
+  lj_gc_check(L);
+  s = lj_str_new(L, str, len);
+  setstrV(L, L->top, s);
+  incr_top(L);
+}
+
+LUA_API void lua_pushstring(lua_State *L, const char *str)
+{
+  if (str == NULL) {
+    setnilV(L->top);
+  } else {
+    GCstr *s;
+    lj_gc_check(L);
+    s = lj_str_newz(L, str);
+    setstrV(L, L->top, s);
+  }
+  incr_top(L);
+}
+
+LUA_API const char *lua_pushvfstring(lua_State *L, const char *fmt,
+				     va_list argp)
+{
+  lj_gc_check(L);
+  return lj_strfmt_pushvf(L, fmt, argp);
+}
+
+LUA_API const char *lua_pushfstring(lua_State *L, const char *fmt, ...)
+{
+  const char *ret;
+  va_list argp;
+  lj_gc_check(L);
+  va_start(argp, fmt);
+  ret = lj_strfmt_pushvf(L, fmt, argp);
+  va_end(argp);
+  return ret;
+}
+
+LUA_API void lua_pushcclosure(lua_State *L, lua_CFunction f, int n)
+{
+  GCfunc *fn;
+  lj_gc_check(L);
+  lj_checkapi_slot(n);
+  fn = lj_func_newC(L, (MSize)n, getcurrenv(L));
+  fn->c.f = f;
+  L->top -= n;
+  while (n--)
+    copyTV(L, &fn->c.upvalue[n], L->top+n);
+  setfuncV(L, L->top, fn);
+  lj_assertL(iswhite(obj2gco(fn)), "new GC object is not white");
+  incr_top(L);
+}
+
+LUA_API void lua_pushboolean(lua_State *L, int b)
+{
+  setboolV(L->top, (b != 0));
+  incr_top(L);
+}
+
+LUA_API void lua_pushlightuserdata(lua_State *L, void *p)
+{
+#if LJ_64
+  p = lj_lightud_intern(L, p);
+#endif
+  setrawlightudV(L->top, p);
+  incr_top(L);
+}
+
+LUA_API void lua_createtable(lua_State *L, int narray, int nrec)
+{
+  lj_gc_check(L);
+  settabV(L, L->top, lj_tab_new_ah(L, narray, nrec));
+  incr_top(L);
+}
+
+LUALIB_API int luaL_newmetatable(lua_State *L, const char *tname)
+{
+  GCtab *regt = tabV(registry(L));
+  TValue *tv = lj_tab_setstr(L, regt, lj_str_newz(L, tname));
+  if (tvisnil(tv)) {
+    GCtab *mt = lj_tab_new(L, 0, 1);
+    settabV(L, tv, mt);
+    settabV(L, L->top++, mt);
+    lj_gc_anybarriert(L, regt);
+    return 1;
+  } else {
+    copyTV(L, L->top++, tv);
+    return 0;
+  }
+}
+
+LUA_API int lua_pushthread(lua_State *L)
+{
+  setthreadV(L, L->top, L);
+  incr_top(L);
+  return (mainthread(G(L)) == L);
+}
+
+LUA_API lua_State *lua_newthread(lua_State *L)
+{
+  lua_State *L1;
+  lj_gc_check(L);
+  L1 = lj_state_new(L);
+  setthreadV(L, L->top, L1);
+  incr_top(L);
+  return L1;
+}
+
+LUA_API void *lua_newuserdata(lua_State *L, size_t size)
+{
+  GCudata *ud;
+  lj_gc_check(L);
+  if (size > LJ_MAX_UDATA)
+    lj_err_msg(L, LJ_ERR_UDATAOV);
+  ud = lj_udata_new(L, (MSize)size, getcurrenv(L));
+  setudataV(L, L->top, ud);
+  incr_top(L);
+  return uddata(ud);
+}
+
+LUA_API void lua_concat(lua_State *L, int n)
+{
+  lj_checkapi_slot(n);
+  if (n >= 2) {
+    n--;
+    do {
+      TValue *top = lj_meta_cat(L, L->top-1, -n);
+      if (top == NULL) {
+	L->top -= n;
+	break;
+      }
+      n -= (int)(L->top - (top - 2*LJ_FR2));
+      L->top = top+2;
+      lj_vm_call(L, top, 1+1);
+      L->top -= 1+LJ_FR2;
+      copyTV(L, L->top-1, L->top+LJ_FR2);
+    } while (--n > 0);
+  } else if (n == 0) {  /* Push empty string. */
+    setstrV(L, L->top, &G(L)->strempty);
+    incr_top(L);
+  }
+  /* else n == 1: nothing to do. */
+}
+
+/* -- Object getters ------------------------------------------------------ */
+
+LUA_API void lua_gettable(lua_State *L, int idx)
+{
+  cTValue *t = index2adr_check(L, idx);
+  cTValue *v = lj_meta_tget(L, t, L->top-1);
+  if (v == NULL) {
+    L->top += 2;
+    lj_vm_call(L, L->top-2, 1+1);
+    L->top -= 2+LJ_FR2;
+    v = L->top+1+LJ_FR2;
+  }
+  copyTV(L, L->top-1, v);
+}
+
+LUA_API void lua_getfield(lua_State *L, int idx, const char *k)
+{
+  cTValue *v, *t = index2adr_check(L, idx);
+  TValue key;
+  setstrV(L, &key, lj_str_newz(L, k));
+  v = lj_meta_tget(L, t, &key);
+  if (v == NULL) {
+    L->top += 2;
+    lj_vm_call(L, L->top-2, 1+1);
+    L->top -= 2+LJ_FR2;
+    v = L->top+1+LJ_FR2;
+  }
+  copyTV(L, L->top, v);
+  incr_top(L);
+}
+
+LUA_API void lua_rawget(lua_State *L, int idx)
+{
+  cTValue *t = index2adr(L, idx);
+  lj_checkapi(tvistab(t), "stack slot %d is not a table", idx);
+  copyTV(L, L->top-1, lj_tab_get(L, tabV(t), L->top-1));
+}
+
+LUA_API void lua_rawgeti(lua_State *L, int idx, int n)
+{
+  cTValue *v, *t = index2adr(L, idx);
+  lj_checkapi(tvistab(t), "stack slot %d is not a table", idx);
+  v = lj_tab_getint(tabV(t), n);
+  if (v) {
+    copyTV(L, L->top, v);
+  } else {
+    setnilV(L->top);
+  }
+  incr_top(L);
+}
+
+LUA_API int lua_getmetatable(lua_State *L, int idx)
+{
+  cTValue *o = index2adr(L, idx);
+  GCtab *mt = NULL;
+  if (tvistab(o))
+    mt = tabref(tabV(o)->metatable);
+  else if (tvisudata(o))
+    mt = tabref(udataV(o)->metatable);
+  else
+    mt = tabref(basemt_obj(G(L), o));
+  if (mt == NULL)
+    return 0;
+  settabV(L, L->top, mt);
+  incr_top(L);
+  return 1;
+}
+
+LUALIB_API int luaL_getmetafield(lua_State *L, int idx, const char *field)
+{
+  if (lua_getmetatable(L, idx)) {
+    cTValue *tv = lj_tab_getstr(tabV(L->top-1), lj_str_newz(L, field));
+    if (tv && !tvisnil(tv)) {
+      copyTV(L, L->top-1, tv);
+      return 1;
+    }
+    L->top--;
+  }
+  return 0;
+}
+
+LUA_API void lua_getfenv(lua_State *L, int idx)
+{
+  cTValue *o = index2adr_check(L, idx);
+  if (tvisfunc(o)) {
+    settabV(L, L->top, tabref(funcV(o)->c.env));
+  } else if (tvisudata(o)) {
+    settabV(L, L->top, tabref(udataV(o)->env));
+  } else if (tvisthread(o)) {
+    settabV(L, L->top, tabref(threadV(o)->env));
+  } else {
+    setnilV(L->top);
+  }
+  incr_top(L);
+}
+
+LUA_API int lua_next(lua_State *L, int idx)
+{
+  cTValue *t = index2adr(L, idx);
+  int more;
+  lj_checkapi(tvistab(t), "stack slot %d is not a table", idx);
+  more = lj_tab_next(tabV(t), L->top-1, L->top-1);
+  if (more > 0) {
+    incr_top(L);  /* Return new key and value slot. */
+  } else if (!more) {  /* End of traversal. */
+    L->top--;  /* Remove key slot. */
+  } else {
+    lj_err_msg(L, LJ_ERR_NEXTIDX);
+  }
+  return more;
+}
+
+LUA_API const char *lua_getupvalue(lua_State *L, int idx, int n)
+{
+  TValue *val;
+  GCobj *o;
+  const char *name = lj_debug_uvnamev(index2adr(L, idx), (uint32_t)(n-1), &val, &o);
+  if (name) {
+    copyTV(L, L->top, val);
+    incr_top(L);
+  }
+  return name;
+}
+
+LUA_API void *lua_upvalueid(lua_State *L, int idx, int n)
+{
+  GCfunc *fn = funcV(index2adr(L, idx));
+  n--;
+  lj_checkapi((uint32_t)n < fn->l.nupvalues, "bad upvalue %d", n);
+  return isluafunc(fn) ? (void *)gcref(fn->l.uvptr[n]) :
+			 (void *)&fn->c.upvalue[n];
+}
+
+LUA_API void lua_upvaluejoin(lua_State *L, int idx1, int n1, int idx2, int n2)
+{
+  GCfunc *fn1 = funcV(index2adr(L, idx1));
+  GCfunc *fn2 = funcV(index2adr(L, idx2));
+  n1--; n2--;
+  lj_checkapi(isluafunc(fn1), "stack slot %d is not a Lua function", idx1);
+  lj_checkapi(isluafunc(fn2), "stack slot %d is not a Lua function", idx2);
+  lj_checkapi((uint32_t)n1 < fn1->l.nupvalues, "bad upvalue %d", n1+1);
+  lj_checkapi((uint32_t)n2 < fn2->l.nupvalues, "bad upvalue %d", n2+1);
+  setgcrefr(fn1->l.uvptr[n1], fn2->l.uvptr[n2]);
+  lj_gc_objbarrier(L, fn1, gcref(fn1->l.uvptr[n1]));
+}
+
+LUALIB_API void *luaL_testudata(lua_State *L, int idx, const char *tname)
+{
+  cTValue *o = index2adr(L, idx);
+  if (tvisudata(o)) {
+    GCudata *ud = udataV(o);
+    cTValue *tv = lj_tab_getstr(tabV(registry(L)), lj_str_newz(L, tname));
+    if (tv && tvistab(tv) && tabV(tv) == tabref(ud->metatable))
+      return uddata(ud);
+  }
+  return NULL;  /* value is not a userdata with a metatable */
+}
+
+LUALIB_API void *luaL_checkudata(lua_State *L, int idx, const char *tname)
+{
+  void *p = luaL_testudata(L, idx, tname);
+  if (!p) lj_err_argtype(L, idx, tname);
+  return p;
+}
+
+/* -- Object setters ------------------------------------------------------ */
+
+LUA_API void lua_settable(lua_State *L, int idx)
+{
+  TValue *o;
+  cTValue *t = index2adr_check(L, idx);
+  lj_checkapi_slot(2);
+  o = lj_meta_tset(L, t, L->top-2);
+  if (o) {
+    /* NOBARRIER: lj_meta_tset ensures the table is not black. */
+    L->top -= 2;
+    copyTV(L, o, L->top+1);
+  } else {
+    TValue *base = L->top;
+    copyTV(L, base+2, base-3-2*LJ_FR2);
+    L->top = base+3;
+    lj_vm_call(L, base, 0+1);
+    L->top -= 3+LJ_FR2;
+  }
+}
+
+LUA_API void lua_setfield(lua_State *L, int idx, const char *k)
+{
+  TValue *o;
+  TValue key;
+  cTValue *t = index2adr_check(L, idx);
+  lj_checkapi_slot(1);
+  setstrV(L, &key, lj_str_newz(L, k));
+  o = lj_meta_tset(L, t, &key);
+  if (o) {
+    /* NOBARRIER: lj_meta_tset ensures the table is not black. */
+    copyTV(L, o, --L->top);
+  } else {
+    TValue *base = L->top;
+    copyTV(L, base+2, base-3-2*LJ_FR2);
+    L->top = base+3;
+    lj_vm_call(L, base, 0+1);
+    L->top -= 2+LJ_FR2;
+  }
+}
+
+LUA_API void lua_rawset(lua_State *L, int idx)
+{
+  GCtab *t = tabV(index2adr(L, idx));
+  TValue *dst, *key;
+  lj_checkapi_slot(2);
+  key = L->top-2;
+  dst = lj_tab_set(L, t, key);
+  copyTV(L, dst, key+1);
+  lj_gc_anybarriert(L, t);
+  L->top = key;
+}
+
+LUA_API void lua_rawseti(lua_State *L, int idx, int n)
+{
+  GCtab *t = tabV(index2adr(L, idx));
+  TValue *dst, *src;
+  lj_checkapi_slot(1);
+  dst = lj_tab_setint(L, t, n);
+  src = L->top-1;
+  copyTV(L, dst, src);
+  lj_gc_barriert(L, t, dst);
+  L->top = src;
+}
+
+LUA_API int lua_setmetatable(lua_State *L, int idx)
+{
+  global_State *g;
+  GCtab *mt;
+  cTValue *o = index2adr_check(L, idx);
+  lj_checkapi_slot(1);
+  if (tvisnil(L->top-1)) {
+    mt = NULL;
+  } else {
+    lj_checkapi(tvistab(L->top-1), "top stack slot is not a table");
+    mt = tabV(L->top-1);
+  }
+  g = G(L);
+  if (tvistab(o)) {
+    setgcref(tabV(o)->metatable, obj2gco(mt));
+    if (mt)
+      lj_gc_objbarriert(L, tabV(o), mt);
+  } else if (tvisudata(o)) {
+    setgcref(udataV(o)->metatable, obj2gco(mt));
+    if (mt)
+      lj_gc_objbarrier(L, udataV(o), mt);
+  } else {
+    /* Flush cache, since traces specialize to basemt. But not during __gc. */
+    if (lj_trace_flushall(L))
+      lj_err_caller(L, LJ_ERR_NOGCMM);
+    if (tvisbool(o)) {
+      /* NOBARRIER: basemt is a GC root. */
+      setgcref(basemt_it(g, LJ_TTRUE), obj2gco(mt));
+      setgcref(basemt_it(g, LJ_TFALSE), obj2gco(mt));
+    } else {
+      /* NOBARRIER: basemt is a GC root. */
+      setgcref(basemt_obj(g, o), obj2gco(mt));
+    }
+  }
+  L->top--;
+  return 1;
+}
+
+LUALIB_API void luaL_setmetatable(lua_State *L, const char *tname)
+{
+  lua_getfield(L, LUA_REGISTRYINDEX, tname);
+  lua_setmetatable(L, -2);
+}
+
+LUA_API int lua_setfenv(lua_State *L, int idx)
+{
+  cTValue *o = index2adr_check(L, idx);
+  GCtab *t;
+  lj_checkapi_slot(1);
+  lj_checkapi(tvistab(L->top-1), "top stack slot is not a table");
+  t = tabV(L->top-1);
+  if (tvisfunc(o)) {
+    setgcref(funcV(o)->c.env, obj2gco(t));
+  } else if (tvisudata(o)) {
+    setgcref(udataV(o)->env, obj2gco(t));
+  } else if (tvisthread(o)) {
+    setgcref(threadV(o)->env, obj2gco(t));
+  } else {
+    L->top--;
+    return 0;
+  }
+  lj_gc_objbarrier(L, gcV(o), t);
+  L->top--;
+  return 1;
+}
+
+LUA_API const char *lua_setupvalue(lua_State *L, int idx, int n)
+{
+  cTValue *f = index2adr(L, idx);
+  TValue *val;
+  GCobj *o;
+  const char *name;
+  lj_checkapi_slot(1);
+  name = lj_debug_uvnamev(f, (uint32_t)(n-1), &val, &o);
+  if (name) {
+    L->top--;
+    copyTV(L, val, L->top);
+    lj_gc_barrier(L, o, L->top);
+  }
+  return name;
+}
+
+/* -- Calls --------------------------------------------------------------- */
+
+#if LJ_FR2
+static TValue *api_call_base(lua_State *L, int nargs)
+{
+  TValue *o = L->top, *base = o - nargs;
+  L->top = o+1;
+  for (; o > base; o--) copyTV(L, o, o-1);
+  setnilV(o);
+  return o+1;
+}
+#else
+#define api_call_base(L, nargs)	(L->top - (nargs))
+#endif
+
+LUA_API void lua_call(lua_State *L, int nargs, int nresults)
+{
+  lj_checkapi(L->status == LUA_OK || L->status == LUA_ERRERR,
+	      "thread called in wrong state %d", L->status);
+  lj_checkapi_slot(nargs+1);
+  lj_vm_call(L, api_call_base(L, nargs), nresults+1);
+}
+
+LUA_API int lua_pcall(lua_State *L, int nargs, int nresults, int errfunc)
+{
+  global_State *g = G(L);
+  uint8_t oldh = hook_save(g);
+  ptrdiff_t ef;
+  int status;
+  lj_checkapi(L->status == LUA_OK || L->status == LUA_ERRERR,
+	      "thread called in wrong state %d", L->status);
+  lj_checkapi_slot(nargs+1);
+  if (errfunc == 0) {
+    ef = 0;
+  } else {
+    cTValue *o = index2adr_stack(L, errfunc);
+    ef = savestack(L, o);
+  }
+  status = lj_vm_pcall(L, api_call_base(L, nargs), nresults+1, ef);
+  if (status) hook_restore(g, oldh);
+  return status;
+}
+
+static TValue *cpcall(lua_State *L, lua_CFunction func, void *ud)
+{
+  GCfunc *fn = lj_func_newC(L, 0, getcurrenv(L));
+  TValue *top = L->top;
+  fn->c.f = func;
+  setfuncV(L, top++, fn);
+  if (LJ_FR2) setnilV(top++);
+#if LJ_64
+  ud = lj_lightud_intern(L, ud);
+#endif
+  setrawlightudV(top++, ud);
+  cframe_nres(L->cframe) = 1+0;  /* Zero results. */
+  L->top = top;
+  return top-1;  /* Now call the newly allocated C function. */
+}
+
+LUA_API int lua_cpcall(lua_State *L, lua_CFunction func, void *ud)
+{
+  global_State *g = G(L);
+  uint8_t oldh = hook_save(g);
+  int status;
+  lj_checkapi(L->status == LUA_OK || L->status == LUA_ERRERR,
+	      "thread called in wrong state %d", L->status);
+  status = lj_vm_cpcall(L, func, ud, cpcall);
+  if (status) hook_restore(g, oldh);
+  return status;
+}
+
+LUALIB_API int luaL_callmeta(lua_State *L, int idx, const char *field)
+{
+  if (luaL_getmetafield(L, idx, field)) {
+    TValue *top = L->top--;
+    if (LJ_FR2) setnilV(top++);
+    copyTV(L, top++, index2adr(L, idx));
+    L->top = top;
+    lj_vm_call(L, top-1, 1+1);
+    return 1;
+  }
+  return 0;
+}
+
+/* -- Coroutine yield and resume ------------------------------------------ */
+
+LUA_API int lua_isyieldable(lua_State *L)
+{
+  return cframe_canyield(L->cframe);
+}
+
+LUA_API int lua_yield(lua_State *L, int nresults)
+{
+  void *cf = L->cframe;
+  global_State *g = G(L);
+  if (cframe_canyield(cf)) {
+    cf = cframe_raw(cf);
+    if (!hook_active(g)) {  /* Regular yield: move results down if needed. */
+      cTValue *f = L->top - nresults;
+      if (f > L->base) {
+	TValue *t = L->base;
+	while (--nresults >= 0) copyTV(L, t++, f++);
+	L->top = t;
+      }
+      L->cframe = NULL;
+      L->status = LUA_YIELD;
+      return -1;
+    } else {  /* Yield from hook: add a pseudo-frame. */
+      TValue *top = L->top;
+      hook_leave(g);
+      (top++)->u64 = cframe_multres(cf);
+      setcont(top, lj_cont_hook);
+      if (LJ_FR2) top++;
+      setframe_pc(top, cframe_pc(cf)-1);
+      top++;
+      setframe_gc(top, obj2gco(L), LJ_TTHREAD);
+      if (LJ_FR2) top++;
+      setframe_ftsz(top, ((char *)(top+1)-(char *)L->base)+FRAME_CONT);
+      L->top = L->base = top+1;
+#if ((defined(__GNUC__) || defined(__clang__)) && (LJ_TARGET_X64 || defined(LUAJIT_UNWIND_EXTERNAL)) && !LJ_NO_UNWIND) || LJ_TARGET_WINDOWS
+      lj_err_throw(L, LUA_YIELD);
+#else
+      L->cframe = NULL;
+      L->status = LUA_YIELD;
+      lj_vm_unwind_c(cf, LUA_YIELD);
+#endif
+    }
+  }
+  lj_err_msg(L, LJ_ERR_CYIELD);
+  return 0;  /* unreachable */
+}
+
+LUA_API int lua_resume(lua_State *L, int nargs)
+{
+  if (L->cframe == NULL && L->status <= LUA_YIELD)
+    return lj_vm_resume(L,
+      L->status == LUA_OK ? api_call_base(L, nargs) : L->top - nargs,
+      0, 0);
+  L->top = L->base;
+  setstrV(L, L->top, lj_err_str(L, LJ_ERR_COSUSP));
+  incr_top(L);
+  return LUA_ERRRUN;
+}
+
+/* -- GC and memory management -------------------------------------------- */
+
+LUA_API int lua_gc(lua_State *L, int what, int data)
+{
+  global_State *g = G(L);
+  int res = 0;
+  switch (what) {
+  case LUA_GCSTOP:
+    g->gc.threshold = LJ_MAX_MEM;
+    break;
+  case LUA_GCRESTART:
+    g->gc.threshold = data == -1 ? (g->gc.total/100)*g->gc.pause : g->gc.total;
+    break;
+  case LUA_GCCOLLECT:
+    lj_gc_fullgc(L);
+    break;
+  case LUA_GCCOUNT:
+    res = (int)(g->gc.total >> 10);
+    break;
+  case LUA_GCCOUNTB:
+    res = (int)(g->gc.total & 0x3ff);
+    break;
+  case LUA_GCSTEP: {
+    GCSize a = (GCSize)data << 10;
+    g->gc.threshold = (a <= g->gc.total) ? (g->gc.total - a) : 0;
+    while (g->gc.total >= g->gc.threshold)
+      if (lj_gc_step(L) > 0) {
+	res = 1;
+	break;
+      }
+    break;
+  }
+  case LUA_GCSETPAUSE:
+    res = (int)(g->gc.pause);
+    g->gc.pause = (MSize)data;
+    break;
+  case LUA_GCSETSTEPMUL:
+    res = (int)(g->gc.stepmul);
+    g->gc.stepmul = (MSize)data;
+    break;
+  case LUA_GCISRUNNING:
+    res = (g->gc.threshold != LJ_MAX_MEM);
+    break;
+  default:
+    res = -1;  /* Invalid option. */
+  }
+  return res;
+}
+
+LUA_API lua_Alloc lua_getallocf(lua_State *L, void **ud)
+{
+  global_State *g = G(L);
+  if (ud) *ud = g->allocd;
+  return g->allocf;
+}
+
+LUA_API void lua_setallocf(lua_State *L, lua_Alloc f, void *ud)
+{
+  global_State *g = G(L);
+  g->allocd = ud;
+  g->allocf = f;
+}
+