--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/luajit/src/luajit.c	Fri Jan 23 22:38:59 2026 -0800
@@ -0,0 +1,586 @@
+/*
+** LuaJIT frontend. Runs commands, scripts, read-eval-print (REPL) etc.
+** 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
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define luajit_c
+
+#include "lua.h"
+#include "lauxlib.h"
+#include "lualib.h"
+#include "luajit.h"
+
+#include "lj_arch.h"
+
+#if LJ_TARGET_POSIX
+#include <unistd.h>
+#define lua_stdin_is_tty()	isatty(0)
+#elif LJ_TARGET_WINDOWS
+#include <io.h>
+#ifdef __BORLANDC__
+#define lua_stdin_is_tty()	isatty(_fileno(stdin))
+#else
+#define lua_stdin_is_tty()	_isatty(_fileno(stdin))
+#endif
+#else
+#define lua_stdin_is_tty()	1
+#endif
+
+#if !LJ_TARGET_CONSOLE
+#include <signal.h>
+#endif
+
+static lua_State *globalL = NULL;
+static const char *progname = LUA_PROGNAME;
+static char *empty_argv[2] = { NULL, NULL };
+
+#if !LJ_TARGET_CONSOLE
+static void lstop(lua_State *L, lua_Debug *ar)
+{
+  (void)ar;  /* unused arg. */
+  lua_sethook(L, NULL, 0, 0);
+  /* Avoid luaL_error -- a C hook doesn't add an extra frame. */
+  luaL_where(L, 0);
+  lua_pushfstring(L, "%sinterrupted!", lua_tostring(L, -1));
+  lua_error(L);
+}
+
+static void laction(int i)
+{
+  signal(i, SIG_DFL); /* if another SIGINT happens before lstop,
+			 terminate process (default action) */
+  lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
+}
+#endif
+
+static void print_usage(void)
+{
+  fputs("usage: ", stderr);
+  fputs(progname, stderr);
+  fputs(" [options]... [script [args]...].\n"
+  "Available options are:\n"
+  "  -e chunk  Execute string " LUA_QL("chunk") ".\n"
+  "  -l name   Require library " LUA_QL("name") ".\n"
+  "  -b ...    Save or list bytecode.\n"
+  "  -j cmd    Perform LuaJIT control command.\n"
+  "  -O[opt]   Control LuaJIT optimizations.\n"
+  "  -i        Enter interactive mode after executing " LUA_QL("script") ".\n"
+  "  -v        Show version information.\n"
+  "  -E        Ignore environment variables.\n"
+  "  --        Stop handling options.\n"
+  "  -         Execute stdin and stop handling options.\n", stderr);
+  fflush(stderr);
+}
+
+static void l_message(const char *msg)
+{
+  if (progname) { fputs(progname, stderr); fputc(':', stderr); fputc(' ', stderr); }
+  fputs(msg, stderr); fputc('\n', stderr);
+  fflush(stderr);
+}
+
+static int report(lua_State *L, int status)
+{
+  if (status && !lua_isnil(L, -1)) {
+    const char *msg = lua_tostring(L, -1);
+    if (msg == NULL) msg = "(error object is not a string)";
+    l_message(msg);
+    lua_pop(L, 1);
+  }
+  return status;
+}
+
+static int traceback(lua_State *L)
+{
+  if (!lua_isstring(L, 1)) { /* Non-string error object? Try metamethod. */
+    if (lua_isnoneornil(L, 1) ||
+	!luaL_callmeta(L, 1, "__tostring") ||
+	!lua_isstring(L, -1))
+      return 1;  /* Return non-string error object. */
+    lua_remove(L, 1);  /* Replace object by result of __tostring metamethod. */
+  }
+  luaL_traceback(L, L, lua_tostring(L, 1), 1);
+  return 1;
+}
+
+static int docall(lua_State *L, int narg, int clear)
+{
+  int status;
+  int base = lua_gettop(L) - narg;  /* function index */
+  lua_pushcfunction(L, traceback);  /* push traceback function */
+  lua_insert(L, base);  /* put it under chunk and args */
+#if !LJ_TARGET_CONSOLE
+  signal(SIGINT, laction);
+#endif
+  status = lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), base);
+#if !LJ_TARGET_CONSOLE
+  signal(SIGINT, SIG_DFL);
+#endif
+  lua_remove(L, base);  /* remove traceback function */
+  /* force a complete garbage collection in case of errors */
+  if (status != LUA_OK) lua_gc(L, LUA_GCCOLLECT, 0);
+  return status;
+}
+
+static void print_version(void)
+{
+  fputs(LUAJIT_VERSION " -- " LUAJIT_COPYRIGHT ". " LUAJIT_URL "\n", stdout);
+}
+
+static void print_jit_status(lua_State *L)
+{
+  int n;
+  const char *s;
+  lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
+  lua_getfield(L, -1, "jit");  /* Get jit.* module table. */
+  lua_remove(L, -2);
+  lua_getfield(L, -1, "status");
+  lua_remove(L, -2);
+  n = lua_gettop(L);
+  lua_call(L, 0, LUA_MULTRET);
+  fputs(lua_toboolean(L, n) ? "JIT: ON" : "JIT: OFF", stdout);
+  for (n++; (s = lua_tostring(L, n)); n++) {
+    putc(' ', stdout);
+    fputs(s, stdout);
+  }
+  putc('\n', stdout);
+  lua_settop(L, 0);  /* clear stack */
+}
+
+static void createargtable(lua_State *L, char **argv, int argc, int argf)
+{
+  int i;
+  lua_createtable(L, argc - argf, argf);
+  for (i = 0; i < argc; i++) {
+    lua_pushstring(L, argv[i]);
+    lua_rawseti(L, -2, i - argf);
+  }
+  lua_setglobal(L, "arg");
+}
+
+static int dofile(lua_State *L, const char *name)
+{
+  int status = luaL_loadfile(L, name) || docall(L, 0, 1);
+  return report(L, status);
+}
+
+static int dostring(lua_State *L, const char *s, const char *name)
+{
+  int status = luaL_loadbuffer(L, s, strlen(s), name) || docall(L, 0, 1);
+  return report(L, status);
+}
+
+static int dolibrary(lua_State *L, const char *name)
+{
+  lua_getglobal(L, "require");
+  lua_pushstring(L, name);
+  return report(L, docall(L, 1, 1));
+}
+
+static void write_prompt(lua_State *L, int firstline)
+{
+  const char *p;
+  lua_getfield(L, LUA_GLOBALSINDEX, firstline ? "_PROMPT" : "_PROMPT2");
+  p = lua_tostring(L, -1);
+  if (p == NULL) p = firstline ? LUA_PROMPT : LUA_PROMPT2;
+  fputs(p, stdout);
+  fflush(stdout);
+  lua_pop(L, 1);  /* remove global */
+}
+
+static int incomplete(lua_State *L, int status)
+{
+  if (status == LUA_ERRSYNTAX) {
+    size_t lmsg;
+    const char *msg = lua_tolstring(L, -1, &lmsg);
+    const char *tp = msg + lmsg - (sizeof(LUA_QL("<eof>")) - 1);
+    if (strstr(msg, LUA_QL("<eof>")) == tp) {
+      lua_pop(L, 1);
+      return 1;
+    }
+  }
+  return 0;  /* else... */
+}
+
+static int pushline(lua_State *L, int firstline)
+{
+  char buf[LUA_MAXINPUT];
+  write_prompt(L, firstline);
+  if (fgets(buf, LUA_MAXINPUT, stdin)) {
+    size_t len = strlen(buf);
+    if (len > 0 && buf[len-1] == '\n')
+      buf[len-1] = '\0';
+    if (firstline && buf[0] == '=')
+      lua_pushfstring(L, "return %s", buf+1);
+    else
+      lua_pushstring(L, buf);
+    return 1;
+  }
+  return 0;
+}
+
+static int loadline(lua_State *L)
+{
+  int status;
+  lua_settop(L, 0);
+  if (!pushline(L, 1))
+    return -1;  /* no input */
+  for (;;) {  /* repeat until gets a complete line */
+    status = luaL_loadbuffer(L, lua_tostring(L, 1), lua_strlen(L, 1), "=stdin");
+    if (!incomplete(L, status)) break;  /* cannot try to add lines? */
+    if (!pushline(L, 0))  /* no more input? */
+      return -1;
+    lua_pushliteral(L, "\n");  /* add a new line... */
+    lua_insert(L, -2);  /* ...between the two lines */
+    lua_concat(L, 3);  /* join them */
+  }
+  lua_remove(L, 1);  /* remove line */
+  return status;
+}
+
+static void dotty(lua_State *L)
+{
+  int status;
+  const char *oldprogname = progname;
+  progname = NULL;
+  while ((status = loadline(L)) != -1) {
+    if (status == LUA_OK) status = docall(L, 0, 0);
+    report(L, status);
+    if (status == LUA_OK && lua_gettop(L) > 0) {  /* any result to print? */
+      lua_getglobal(L, "print");
+      lua_insert(L, 1);
+      if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != 0)
+	l_message(lua_pushfstring(L, "error calling " LUA_QL("print") " (%s)",
+				  lua_tostring(L, -1)));
+    }
+  }
+  lua_settop(L, 0);  /* clear stack */
+  fputs("\n", stdout);
+  fflush(stdout);
+  progname = oldprogname;
+}
+
+static int handle_script(lua_State *L, char **argx)
+{
+  int status;
+  const char *fname = argx[0];
+  if (strcmp(fname, "-") == 0 && strcmp(argx[-1], "--") != 0)
+    fname = NULL;  /* stdin */
+  status = luaL_loadfile(L, fname);
+  if (status == LUA_OK) {
+    /* Fetch args from arg table. LUA_INIT or -e might have changed them. */
+    int narg = 0;
+    lua_getglobal(L, "arg");
+    if (lua_istable(L, -1)) {
+      do {
+	narg++;
+	lua_rawgeti(L, -narg, narg);
+      } while (!lua_isnil(L, -1));
+      lua_pop(L, 1);
+      lua_remove(L, -narg);
+      narg--;
+    } else {
+      lua_pop(L, 1);
+    }
+    status = docall(L, narg, 0);
+  }
+  return report(L, status);
+}
+
+/* Load add-on module. */
+static int loadjitmodule(lua_State *L)
+{
+  lua_getglobal(L, "require");
+  lua_pushliteral(L, "jit.");
+  lua_pushvalue(L, -3);
+  lua_concat(L, 2);
+  if (lua_pcall(L, 1, 1, 0)) {
+    const char *msg = lua_tostring(L, -1);
+    if (msg && !strncmp(msg, "module ", 7))
+      goto nomodule;
+    return report(L, 1);
+  }
+  lua_getfield(L, -1, "start");
+  if (lua_isnil(L, -1)) {
+  nomodule:
+    l_message("unknown luaJIT command or jit.* modules not installed");
+    return 1;
+  }
+  lua_remove(L, -2);  /* Drop module table. */
+  return 0;
+}
+
+/* Run command with options. */
+static int runcmdopt(lua_State *L, const char *opt)
+{
+  int narg = 0;
+  if (opt && *opt) {
+    for (;;) {  /* Split arguments. */
+      const char *p = strchr(opt, ',');
+      narg++;
+      if (!p) break;
+      if (p == opt)
+	lua_pushnil(L);
+      else
+	lua_pushlstring(L, opt, (size_t)(p - opt));
+      opt = p + 1;
+    }
+    if (*opt)
+      lua_pushstring(L, opt);
+    else
+      lua_pushnil(L);
+  }
+  return report(L, lua_pcall(L, narg, 0, 0));
+}
+
+/* JIT engine control command: try jit library first or load add-on module. */
+static int dojitcmd(lua_State *L, const char *cmd)
+{
+  const char *opt = strchr(cmd, '=');
+  lua_pushlstring(L, cmd, opt ? (size_t)(opt - cmd) : strlen(cmd));
+  lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
+  lua_getfield(L, -1, "jit");  /* Get jit.* module table. */
+  lua_remove(L, -2);
+  lua_pushvalue(L, -2);
+  lua_gettable(L, -2);  /* Lookup library function. */
+  if (!lua_isfunction(L, -1)) {
+    lua_pop(L, 2);  /* Drop non-function and jit.* table, keep module name. */
+    if (loadjitmodule(L))
+      return 1;
+  } else {
+    lua_remove(L, -2);  /* Drop jit.* table. */
+  }
+  lua_remove(L, -2);  /* Drop module name. */
+  return runcmdopt(L, opt ? opt+1 : opt);
+}
+
+/* Optimization flags. */
+static int dojitopt(lua_State *L, const char *opt)
+{
+  lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
+  lua_getfield(L, -1, "jit.opt");  /* Get jit.opt.* module table. */
+  lua_remove(L, -2);
+  lua_getfield(L, -1, "start");
+  lua_remove(L, -2);
+  return runcmdopt(L, opt);
+}
+
+/* Save or list bytecode. */
+static int dobytecode(lua_State *L, char **argv)
+{
+  int narg = 0;
+  lua_pushliteral(L, "bcsave");
+  if (loadjitmodule(L))
+    return 1;
+  if (argv[0][2]) {
+    narg++;
+    argv[0][1] = '-';
+    lua_pushstring(L, argv[0]+1);
+  }
+  for (argv++; *argv != NULL; narg++, argv++)
+    lua_pushstring(L, *argv);
+  report(L, lua_pcall(L, narg, 0, 0));
+  return -1;
+}
+
+/* check that argument has no extra characters at the end */
+#define notail(x)	{if ((x)[2] != '\0') return -1;}
+
+#define FLAGS_INTERACTIVE	1
+#define FLAGS_VERSION		2
+#define FLAGS_EXEC		4
+#define FLAGS_OPTION		8
+#define FLAGS_NOENV		16
+
+static int collectargs(char **argv, int *flags)
+{
+  int i;
+  for (i = 1; argv[i] != NULL; i++) {
+    if (argv[i][0] != '-')  /* Not an option? */
+      return i;
+    switch (argv[i][1]) {  /* Check option. */
+    case '-':
+      notail(argv[i]);
+      return i+1;
+    case '\0':
+      return i;
+    case 'i':
+      notail(argv[i]);
+      *flags |= FLAGS_INTERACTIVE;
+      /* fallthrough */
+    case 'v':
+      notail(argv[i]);
+      *flags |= FLAGS_VERSION;
+      break;
+    case 'e':
+      *flags |= FLAGS_EXEC;
+      /* fallthrough */
+    case 'j':  /* LuaJIT extension */
+    case 'l':
+      *flags |= FLAGS_OPTION;
+      if (argv[i][2] == '\0') {
+	i++;
+	if (argv[i] == NULL) return -1;
+      }
+      break;
+    case 'O': break;  /* LuaJIT extension */
+    case 'b':  /* LuaJIT extension */
+      if (*flags) return -1;
+      *flags |= FLAGS_EXEC;
+      return i+1;
+    case 'E':
+      *flags |= FLAGS_NOENV;
+      break;
+    default: return -1;  /* invalid option */
+    }
+  }
+  return i;
+}
+
+static int runargs(lua_State *L, char **argv, int argn)
+{
+  int i;
+  for (i = 1; i < argn; i++) {
+    if (argv[i] == NULL) continue;
+    lua_assert(argv[i][0] == '-');
+    switch (argv[i][1]) {
+    case 'e': {
+      const char *chunk = argv[i] + 2;
+      if (*chunk == '\0') chunk = argv[++i];
+      lua_assert(chunk != NULL);
+      if (dostring(L, chunk, "=(command line)") != 0)
+	return 1;
+      break;
+      }
+    case 'l': {
+      const char *filename = argv[i] + 2;
+      if (*filename == '\0') filename = argv[++i];
+      lua_assert(filename != NULL);
+      if (dolibrary(L, filename))
+	return 1;
+      break;
+      }
+    case 'j': {  /* LuaJIT extension. */
+      const char *cmd = argv[i] + 2;
+      if (*cmd == '\0') cmd = argv[++i];
+      lua_assert(cmd != NULL);
+      if (dojitcmd(L, cmd))
+	return 1;
+      break;
+      }
+    case 'O':  /* LuaJIT extension. */
+      if (dojitopt(L, argv[i] + 2))
+	return 1;
+      break;
+    case 'b':  /* LuaJIT extension. */
+      return dobytecode(L, argv+i);
+    default: break;
+    }
+  }
+  return LUA_OK;
+}
+
+static int handle_luainit(lua_State *L)
+{
+#if LJ_TARGET_CONSOLE
+  const char *init = NULL;
+#else
+  const char *init = getenv(LUA_INIT);
+#endif
+  if (init == NULL)
+    return LUA_OK;
+  else if (init[0] == '@')
+    return dofile(L, init+1);
+  else
+    return dostring(L, init, "=" LUA_INIT);
+}
+
+static struct Smain {
+  char **argv;
+  int argc;
+  int status;
+} smain;
+
+static int pmain(lua_State *L)
+{
+  struct Smain *s = &smain;
+  char **argv = s->argv;
+  int argn;
+  int flags = 0;
+  globalL = L;
+  LUAJIT_VERSION_SYM();  /* Linker-enforced version check. */
+
+  argn = collectargs(argv, &flags);
+  if (argn < 0) {  /* Invalid args? */
+    print_usage();
+    s->status = 1;
+    return 0;
+  }
+
+  if ((flags & FLAGS_NOENV)) {
+    lua_pushboolean(L, 1);
+    lua_setfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
+  }
+
+  /* Stop collector during library initialization. */
+  lua_gc(L, LUA_GCSTOP, 0);
+  luaL_openlibs(L);
+  lua_gc(L, LUA_GCRESTART, -1);
+
+  createargtable(L, argv, s->argc, argn);
+
+  if (!(flags & FLAGS_NOENV)) {
+    s->status = handle_luainit(L);
+    if (s->status != LUA_OK) return 0;
+  }
+
+  if ((flags & FLAGS_VERSION)) print_version();
+
+  s->status = runargs(L, argv, argn);
+  if (s->status != LUA_OK) return 0;
+
+  if (s->argc > argn) {
+    s->status = handle_script(L, argv + argn);
+    if (s->status != LUA_OK) return 0;
+  }
+
+  if ((flags & FLAGS_INTERACTIVE)) {
+    print_jit_status(L);
+    dotty(L);
+  } else if (s->argc == argn && !(flags & (FLAGS_EXEC|FLAGS_VERSION))) {
+    if (lua_stdin_is_tty()) {
+      print_version();
+      print_jit_status(L);
+      dotty(L);
+    } else {
+      dofile(L, NULL);  /* Executes stdin as a file. */
+    }
+  }
+  return 0;
+}
+
+int main(int argc, char **argv)
+{
+  int status;
+  lua_State *L;
+  if (!argv[0]) argv = empty_argv; else if (argv[0][0]) progname = argv[0];
+  L = lua_open();
+  if (L == NULL) {
+    l_message("cannot create state: not enough memory");
+    return EXIT_FAILURE;
+  }
+  smain.argc = argc;
+  smain.argv = argv;
+  status = lua_cpcall(L, pmain, NULL);
+  report(L, status);
+  lua_close(L);
+  return (status || smain.status > 0) ? EXIT_FAILURE : EXIT_SUCCESS;
+}
+