source/libs/luajit/LuaJIT-src/src/luajit.c

   1 /*
   2 ** LuaJIT frontend. Runs commands, scripts, read-eval-print (REPL) etc.
   3 ** Copyright (C) 2005-2015 Mike Pall. See Copyright Notice in luajit.h
   4 **
   5 ** Major portions taken verbatim or adapted from the Lua interpreter.
   6 ** Copyright (C) 1994-2008 Lua.org, PUC-Rio. See Copyright Notice in lua.h
   7 */
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12
  13 #define luajit_c
  14
  15 #include "lua.h"
  16 #include "lauxlib.h"
  17 #include "lualib.h"
  18 #include "luajit.h"
  19
  20 #include "lj_arch.h"
  21
  22 #if LJ_TARGET_POSIX
  23 #include <unistd.h>
  24 #define lua_stdin_is_tty()      isatty(0)
  25 #elif LJ_TARGET_WINDOWS
  26 #include <io.h>
  27 #ifdef __BORLANDC__
  28 #define lua_stdin_is_tty()      isatty(_fileno(stdin))
  29 #else
  30 #define lua_stdin_is_tty()      _isatty(_fileno(stdin))
  31 #endif
  32 #else
  33 #define lua_stdin_is_tty()      1
  34 #endif
  35
  36 #if !LJ_TARGET_CONSOLE
  37 #include <signal.h>
  38 #endif
  39
  40 static lua_State *globalL = NULL;
  41 static const char *progname = LUA_PROGNAME;
  42
  43 #if !LJ_TARGET_CONSOLE
  44 static void lstop(lua_State *L, lua_Debug *ar)
  45 {
  46   (void)ar;  /* unused arg. */
  47   lua_sethook(L, NULL, 0, 0);
  48   /* Avoid luaL_error -- a C hook doesn't add an extra frame. */
  49   luaL_where(L, 0);
  50   lua_pushfstring(L, "%sinterrupted!", lua_tostring(L, -1));
  51   lua_error(L);
  52 }
  53
  54 static void laction(int i)
  55 {
  56   signal(i, SIG_DFL); /* if another SIGINT happens before lstop,
  57                          terminate process (default action) */
  58   lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
  59 }
  60 #endif
  61
  62 static void print_usage(void)
  63 {
  64   fputs("usage: ", stderr);
  65   fputs(progname, stderr);
  66   fputs(" [options]... [script [args]...].\n"
  67   "Available options are:\n"
  68   "  -e chunk  Execute string " LUA_QL("chunk") ".\n"
  69   "  -l name   Require library " LUA_QL("name") ".\n"
  70   "  -b ...    Save or list bytecode.\n"
  71   "  -j cmd    Perform LuaJIT control command.\n"
  72   "  -O[opt]   Control LuaJIT optimizations.\n"
  73   "  -i        Enter interactive mode after executing " LUA_QL("script") ".\n"
  74   "  -v        Show version information.\n"
  75   "  -E        Ignore environment variables.\n"
  76   "  --        Stop handling options.\n"
  77   "  -         Execute stdin and stop handling options.\n", stderr);
  78   fflush(stderr);
  79 }
  80
  81 static void l_message(const char *pname, const char *msg)
  82 {
  83   if (pname) { fputs(pname, stderr); fputc(':', stderr); fputc(' ', stderr); }
  84   fputs(msg, stderr); fputc('\n', stderr);
  85   fflush(stderr);
  86 }
  87
  88 static int report(lua_State *L, int status)
  89 {
  90   if (status && !lua_isnil(L, -1)) {
  91     const char *msg = lua_tostring(L, -1);
  92     if (msg == NULL) msg = "(error object is not a string)";
  93     l_message(progname, msg);
  94     lua_pop(L, 1);
  95   }
  96   return status;
  97 }
  98
  99 static int traceback(lua_State *L)
 100 {
 101   if (!lua_isstring(L, 1)) { /* Non-string error object? Try metamethod. */
 102     if (lua_isnoneornil(L, 1) ||
 103         !luaL_callmeta(L, 1, "__tostring") ||
 104         !lua_isstring(L, -1))
 105       return 1;  /* Return non-string error object. */
 106     lua_remove(L, 1);  /* Replace object by result of __tostring metamethod. */
 107   }
 108   luaL_traceback(L, L, lua_tostring(L, 1), 1);
 109   return 1;
 110 }
 111
 112 static int docall(lua_State *L, int narg, int clear)
 113 {
 114   int status;
 115   int base = lua_gettop(L) - narg;  /* function index */
 116   lua_pushcfunction(L, traceback);  /* push traceback function */
 117   lua_insert(L, base);  /* put it under chunk and args */
 118 #if !LJ_TARGET_CONSOLE
 119   signal(SIGINT, laction);
 120 #endif
 121   status = lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), base);
 122 #if !LJ_TARGET_CONSOLE
 123   signal(SIGINT, SIG_DFL);
 124 #endif
 125   lua_remove(L, base);  /* remove traceback function */
 126   /* force a complete garbage collection in case of errors */
 127   if (status != 0) lua_gc(L, LUA_GCCOLLECT, 0);
 128   return status;
 129 }
 130
 131 static void print_version(void)
 132 {
 133   fputs(LUAJIT_VERSION " -- " LUAJIT_COPYRIGHT ". " LUAJIT_URL "\n", stdout);
 134 }
 135
 136 static void print_jit_status(lua_State *L)
 137 {
 138   int n;
 139   const char *s;
 140   lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
 141   lua_getfield(L, -1, "jit");  /* Get jit.* module table. */
 142   lua_remove(L, -2);
 143   lua_getfield(L, -1, "status");
 144   lua_remove(L, -2);
 145   n = lua_gettop(L);
 146   lua_call(L, 0, LUA_MULTRET);
 147   fputs(lua_toboolean(L, n) ? "JIT: ON" : "JIT: OFF", stdout);
 148   for (n++; (s = lua_tostring(L, n)); n++) {
 149     putc(' ', stdout);
 150     fputs(s, stdout);
 151   }
 152   putc('\n', stdout);
 153 }
 154
 155 static int getargs(lua_State *L, char **argv, int n)
 156 {
 157   int narg;
 158   int i;
 159   int argc = 0;
 160   while (argv[argc]) argc++;  /* count total number of arguments */
 161   narg = argc - (n + 1);  /* number of arguments to the script */
 162   luaL_checkstack(L, narg + 3, "too many arguments to script");
 163   for (i = n+1; i < argc; i++)
 164     lua_pushstring(L, argv[i]);
 165   lua_createtable(L, narg, n + 1);
 166   for (i = 0; i < argc; i++) {
 167     lua_pushstring(L, argv[i]);
 168     lua_rawseti(L, -2, i - n);
 169   }
 170   return narg;
 171 }
 172
 173 static int dofile(lua_State *L, const char *name)
 174 {
 175   int status = luaL_loadfile(L, name) || docall(L, 0, 1);
 176   return report(L, status);
 177 }
 178
 179 static int dostring(lua_State *L, const char *s, const char *name)
 180 {
 181   int status = luaL_loadbuffer(L, s, strlen(s), name) || docall(L, 0, 1);
 182   return report(L, status);
 183 }
 184
 185 static int dolibrary(lua_State *L, const char *name)
 186 {
 187   lua_getglobal(L, "require");
 188   lua_pushstring(L, name);
 189   return report(L, docall(L, 1, 1));
 190 }
 191
 192 static void write_prompt(lua_State *L, int firstline)
 193 {
 194   const char *p;
 195   lua_getfield(L, LUA_GLOBALSINDEX, firstline ? "_PROMPT" : "_PROMPT2");
 196   p = lua_tostring(L, -1);
 197   if (p == NULL) p = firstline ? LUA_PROMPT : LUA_PROMPT2;
 198   fputs(p, stdout);
 199   fflush(stdout);
 200   lua_pop(L, 1);  /* remove global */
 201 }
 202
 203 static int incomplete(lua_State *L, int status)
 204 {
 205   if (status == LUA_ERRSYNTAX) {
 206     size_t lmsg;
 207     const char *msg = lua_tolstring(L, -1, &lmsg);
 208     const char *tp = msg + lmsg - (sizeof(LUA_QL("<eof>")) - 1);
 209     if (strstr(msg, LUA_QL("<eof>")) == tp) {
 210       lua_pop(L, 1);
 211       return 1;
 212     }
 213   }
 214   return 0;  /* else... */
 215 }
 216
 217 static int pushline(lua_State *L, int firstline)
 218 {
 219   char buf[LUA_MAXINPUT];
 220   write_prompt(L, firstline);
 221   if (fgets(buf, LUA_MAXINPUT, stdin)) {
 222     size_t len = strlen(buf);
 223     if (len > 0 && buf[len-1] == '\n')
 224       buf[len-1] = '\0';
 225     if (firstline && buf[0] == '=')
 226       lua_pushfstring(L, "return %s", buf+1);
 227     else
 228       lua_pushstring(L, buf);
 229     return 1;
 230   }
 231   return 0;
 232 }
 233
 234 static int loadline(lua_State *L)
 235 {
 236   int status;
 237   lua_settop(L, 0);
 238   if (!pushline(L, 1))
 239     return -1;  /* no input */
 240   for (;;) {  /* repeat until gets a complete line */
 241     status = luaL_loadbuffer(L, lua_tostring(L, 1), lua_strlen(L, 1), "=stdin");
 242     if (!incomplete(L, status)) break;  /* cannot try to add lines? */
 243     if (!pushline(L, 0))  /* no more input? */
 244       return -1;
 245     lua_pushliteral(L, "\n");  /* add a new line... */
 246     lua_insert(L, -2);  /* ...between the two lines */
 247     lua_concat(L, 3);  /* join them */
 248   }
 249   lua_remove(L, 1);  /* remove line */
 250   return status;
 251 }
 252
 253 static void dotty(lua_State *L)
 254 {
 255   int status;
 256   const char *oldprogname = progname;
 257   progname = NULL;
 258   while ((status = loadline(L)) != -1) {
 259     if (status == 0) status = docall(L, 0, 0);
 260     report(L, status);
 261     if (status == 0 && lua_gettop(L) > 0) {  /* any result to print? */
 262       lua_getglobal(L, "print");
 263       lua_insert(L, 1);
 264       if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != 0)
 265         l_message(progname,
 266           lua_pushfstring(L, "error calling " LUA_QL("print") " (%s)",
 267                               lua_tostring(L, -1)));
 268     }
 269   }
 270   lua_settop(L, 0);  /* clear stack */
 271   fputs("\n", stdout);
 272   fflush(stdout);
 273   progname = oldprogname;
 274 }
 275
 276 static int handle_script(lua_State *L, char **argv, int n)
 277 {
 278   int status;
 279   const char *fname;
 280   int narg = getargs(L, argv, n);  /* collect arguments */
 281   lua_setglobal(L, "arg");
 282   fname = argv[n];
 283   if (strcmp(fname, "-") == 0 && strcmp(argv[n-1], "--") != 0)
 284     fname = NULL;  /* stdin */
 285   status = luaL_loadfile(L, fname);
 286   lua_insert(L, -(narg+1));
 287   if (status == 0)
 288     status = docall(L, narg, 0);
 289   else
 290     lua_pop(L, narg);
 291   return report(L, status);
 292 }
 293
 294 /* Load add-on module. */
 295 static int loadjitmodule(lua_State *L)
 296 {
 297   lua_getglobal(L, "require");
 298   lua_pushliteral(L, "jit.");
 299   lua_pushvalue(L, -3);
 300   lua_concat(L, 2);
 301   if (lua_pcall(L, 1, 1, 0)) {
 302     const char *msg = lua_tostring(L, -1);
 303     if (msg && !strncmp(msg, "module ", 7))
 304       goto nomodule;
 305     return report(L, 1);
 306   }
 307   lua_getfield(L, -1, "start");
 308   if (lua_isnil(L, -1)) {
 309   nomodule:
 310     l_message(progname,
 311               "unknown luaJIT command or jit.* modules not installed");
 312     return 1;
 313   }
 314   lua_remove(L, -2);  /* Drop module table. */
 315   return 0;
 316 }
 317
 318 /* Run command with options. */
 319 static int runcmdopt(lua_State *L, const char *opt)
 320 {
 321   int narg = 0;
 322   if (opt && *opt) {
 323     for (;;) {  /* Split arguments. */
 324       const char *p = strchr(opt, ',');
 325       narg++;
 326       if (!p) break;
 327       if (p == opt)
 328         lua_pushnil(L);
 329       else
 330         lua_pushlstring(L, opt, (size_t)(p - opt));
 331       opt = p + 1;
 332     }
 333     if (*opt)
 334       lua_pushstring(L, opt);
 335     else
 336       lua_pushnil(L);
 337   }
 338   return report(L, lua_pcall(L, narg, 0, 0));
 339 }
 340
 341 /* JIT engine control command: try jit library first or load add-on module. */
 342 static int dojitcmd(lua_State *L, const char *cmd)
 343 {
 344   const char *opt = strchr(cmd, '=');
 345   lua_pushlstring(L, cmd, opt ? (size_t)(opt - cmd) : strlen(cmd));
 346   lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
 347   lua_getfield(L, -1, "jit");  /* Get jit.* module table. */
 348   lua_remove(L, -2);
 349   lua_pushvalue(L, -2);
 350   lua_gettable(L, -2);  /* Lookup library function. */
 351   if (!lua_isfunction(L, -1)) {
 352     lua_pop(L, 2);  /* Drop non-function and jit.* table, keep module name. */
 353     if (loadjitmodule(L))
 354       return 1;
 355   } else {
 356     lua_remove(L, -2);  /* Drop jit.* table. */
 357   }
 358   lua_remove(L, -2);  /* Drop module name. */
 359   return runcmdopt(L, opt ? opt+1 : opt);
 360 }
 361
 362 /* Optimization flags. */
 363 static int dojitopt(lua_State *L, const char *opt)
 364 {
 365   lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
 366   lua_getfield(L, -1, "jit.opt");  /* Get jit.opt.* module table. */
 367   lua_remove(L, -2);
 368   lua_getfield(L, -1, "start");
 369   lua_remove(L, -2);
 370   return runcmdopt(L, opt);
 371 }
 372
 373 /* Save or list bytecode. */
 374 static int dobytecode(lua_State *L, char **argv)
 375 {
 376   int narg = 0;
 377   lua_pushliteral(L, "bcsave");
 378   if (loadjitmodule(L))
 379     return 1;
 380   if (argv[0][2]) {
 381     narg++;
 382     argv[0][1] = '-';
 383     lua_pushstring(L, argv[0]+1);
 384   }
 385   for (argv++; *argv != NULL; narg++, argv++)
 386     lua_pushstring(L, *argv);
 387   return report(L, lua_pcall(L, narg, 0, 0));
 388 }
 389
 390 /* check that argument has no extra characters at the end */
 391 #define notail(x)       {if ((x)[2] != '\0') return -1;}
 392
 393 #define FLAGS_INTERACTIVE       1
 394 #define FLAGS_VERSION           2
 395 #define FLAGS_EXEC              4
 396 #define FLAGS_OPTION            8
 397 #define FLAGS_NOENV             16
 398
 399 static int collectargs(char **argv, int *flags)
 400 {
 401   int i;
 402   for (i = 1; argv[i] != NULL; i++) {
 403     if (argv[i][0] != '-')  /* Not an option? */
 404       return i;
 405     switch (argv[i][1]) {  /* Check option. */
 406     case '-':
 407       notail(argv[i]);
 408       return (argv[i+1] != NULL ? i+1 : 0);
 409     case '\0':
 410       return i;
 411     case 'i':
 412       notail(argv[i]);
 413       *flags |= FLAGS_INTERACTIVE;
 414       /* fallthrough */
 415     case 'v':
 416       notail(argv[i]);
 417       *flags |= FLAGS_VERSION;
 418       break;
 419     case 'e':
 420       *flags |= FLAGS_EXEC;
 421     case 'j':  /* LuaJIT extension */
 422     case 'l':
 423       *flags |= FLAGS_OPTION;
 424       if (argv[i][2] == '\0') {
 425         i++;
 426         if (argv[i] == NULL) return -1;
 427       }
 428       break;
 429     case 'O': break;  /* LuaJIT extension */
 430     case 'b':  /* LuaJIT extension */
 431       if (*flags) return -1;
 432       *flags |= FLAGS_EXEC;
 433       return 0;
 434     case 'E':
 435       *flags |= FLAGS_NOENV;
 436       break;
 437     default: return -1;  /* invalid option */
 438     }
 439   }
 440   return 0;
 441 }
 442
 443 static int runargs(lua_State *L, char **argv, int n)
 444 {
 445   int i;
 446   for (i = 1; i < n; i++) {
 447     if (argv[i] == NULL) continue;
 448     lua_assert(argv[i][0] == '-');
 449     switch (argv[i][1]) {  /* option */
 450     case 'e': {
 451       const char *chunk = argv[i] + 2;
 452       if (*chunk == '\0') chunk = argv[++i];
 453       lua_assert(chunk != NULL);
 454       if (dostring(L, chunk, "=(command line)") != 0)
 455         return 1;
 456       break;
 457       }
 458     case 'l': {
 459       const char *filename = argv[i] + 2;
 460       if (*filename == '\0') filename = argv[++i];
 461       lua_assert(filename != NULL);
 462       if (dolibrary(L, filename))
 463         return 1;  /* stop if file fails */
 464       break;
 465       }
 466     case 'j': {  /* LuaJIT extension */
 467       const char *cmd = argv[i] + 2;
 468       if (*cmd == '\0') cmd = argv[++i];
 469       lua_assert(cmd != NULL);
 470       if (dojitcmd(L, cmd))
 471         return 1;
 472       break;
 473       }
 474     case 'O':  /* LuaJIT extension */
 475       if (dojitopt(L, argv[i] + 2))
 476         return 1;
 477       break;
 478     case 'b':  /* LuaJIT extension */
 479       return dobytecode(L, argv+i);
 480     default: break;
 481     }
 482   }
 483   return 0;
 484 }
 485
 486 static int handle_luainit(lua_State *L)
 487 {
 488 #if LJ_TARGET_CONSOLE
 489   const char *init = NULL;
 490 #else
 491   const char *init = getenv(LUA_INIT);
 492 #endif
 493   if (init == NULL)
 494     return 0;  /* status OK */
 495   else if (init[0] == '@')
 496     return dofile(L, init+1);
 497   else
 498     return dostring(L, init, "=" LUA_INIT);
 499 }
 500
 501 static struct Smain {
 502   char **argv;
 503   int argc;
 504   int status;
 505 } smain;
 506
 507 static int pmain(lua_State *L)
 508 {
 509   struct Smain *s = &smain;
 510   char **argv = s->argv;
 511   int script;
 512   int flags = 0;
 513   globalL = L;
 514   if (argv[0] && argv[0][0]) progname = argv[0];
 515   LUAJIT_VERSION_SYM();  /* linker-enforced version check */
 516   script = collectargs(argv, &flags);
 517   if (script < 0) {  /* invalid args? */
 518     print_usage();
 519     s->status = 1;
 520     return 0;
 521   }
 522   if ((flags & FLAGS_NOENV)) {
 523     lua_pushboolean(L, 1);
 524     lua_setfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
 525   }
 526   lua_gc(L, LUA_GCSTOP, 0);  /* stop collector during initialization */
 527   luaL_openlibs(L);  /* open libraries */
 528   lua_gc(L, LUA_GCRESTART, -1);
 529   if (!(flags & FLAGS_NOENV)) {
 530     s->status = handle_luainit(L);
 531     if (s->status != 0) return 0;
 532   }
 533   if ((flags & FLAGS_VERSION)) print_version();
 534   s->status = runargs(L, argv, (script > 0) ? script : s->argc);
 535   if (s->status != 0) return 0;
 536   if (script) {
 537     s->status = handle_script(L, argv, script);
 538     if (s->status != 0) return 0;
 539   }
 540   if ((flags & FLAGS_INTERACTIVE)) {
 541     print_jit_status(L);
 542     dotty(L);
 543   } else if (script == 0 && !(flags & (FLAGS_EXEC|FLAGS_VERSION))) {
 544     if (lua_stdin_is_tty()) {
 545       print_version();
 546       print_jit_status(L);
 547       dotty(L);
 548     } else {
 549       dofile(L, NULL);  /* executes stdin as a file */
 550     }
 551   }
 552   return 0;
 553 }
 554
 555 int main(int argc, char **argv)
 556 {
 557   int status;
 558   lua_State *L = lua_open();  /* create state */
 559   if (L == NULL) {
 560     l_message(argv[0], "cannot create state: not enough memory");
 561     return EXIT_FAILURE;
 562   }
 563   smain.argc = argc;
 564   smain.argv = argv;
 565   status = lua_cpcall(L, pmain, NULL);
 566   report(L, status);
 567   lua_close(L);
 568   return (status || smain.status) ? EXIT_FAILURE : EXIT_SUCCESS;
 569 }
 570