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-rw-r--r--src/luajit.c519
1 files changed, 519 insertions, 0 deletions
diff --git a/src/luajit.c b/src/luajit.c
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1/*
2** LuaJIT frontend. Runs commands, scripts, read-eval-print (REPL) etc.
3** Copyright (C) 2005-2009 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 <signal.h>
10#include <stdio.h>
11#include <stdlib.h>
12#include <string.h>
13
14#define luajit_c
15
16#include "lua.h"
17#include "lauxlib.h"
18#include "lualib.h"
19#include "luajit.h"
20
21#if defined(LUA_USE_POSIX)
22#include <unistd.h>
23#define lua_stdin_is_tty() isatty(0)
24#elif defined(LUA_USE_WIN)
25#include <io.h>
26#ifdef __BORLANDC__
27#define lua_stdin_is_tty() isatty(_fileno(stdin))
28#else
29#define lua_stdin_is_tty() _isatty(_fileno(stdin))
30#endif
31#else
32#define lua_stdin_is_tty() 1
33#endif
34
35static lua_State *globalL = NULL;
36static const char *progname = LUA_PROGNAME;
37
38static void lstop(lua_State *L, lua_Debug *ar)
39{
40 (void)ar; /* unused arg. */
41 lua_sethook(L, NULL, 0, 0);
42 /* Avoid luaL_error -- a C hook doesn't add an extra frame. */
43 luaL_where(L, 0);
44 lua_pushfstring(L, "%sinterrupted!", lua_tostring(L, -1));
45 lua_error(L);
46}
47
48static void laction(int i)
49{
50 signal(i, SIG_DFL); /* if another SIGINT happens before lstop,
51 terminate process (default action) */
52 lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
53}
54
55static void print_usage(void)
56{
57 fprintf(stderr,
58 "usage: %s [options] [script [args]].\n"
59 "Available options are:\n"
60 " -e stat execute string " LUA_QL("stat") "\n"
61 " -l name require library " LUA_QL("name") "\n"
62 " -j cmd perform LuaJIT control command\n"
63 " -O[lvl] set LuaJIT optimization level\n"
64 " -i enter interactive mode after executing " LUA_QL("script") "\n"
65 " -v show version information\n"
66 " -- stop handling options\n"
67 " - execute stdin and stop handling options\n"
68 ,
69 progname);
70 fflush(stderr);
71}
72
73static void l_message(const char *pname, const char *msg)
74{
75 if (pname) fprintf(stderr, "%s: ", pname);
76 fprintf(stderr, "%s\n", msg);
77 fflush(stderr);
78}
79
80static int report(lua_State *L, int status)
81{
82 if (status && !lua_isnil(L, -1)) {
83 const char *msg = lua_tostring(L, -1);
84 if (msg == NULL) msg = "(error object is not a string)";
85 l_message(progname, msg);
86 lua_pop(L, 1);
87 }
88 return status;
89}
90
91static int traceback(lua_State *L)
92{
93 if (!lua_isstring(L, 1)) /* 'message' not a string? */
94 return 1; /* keep it intact */
95 lua_getfield(L, LUA_GLOBALSINDEX, "debug");
96 if (!lua_istable(L, -1)) {
97 lua_pop(L, 1);
98 return 1;
99 }
100 lua_getfield(L, -1, "traceback");
101 if (!lua_isfunction(L, -1)) {
102 lua_pop(L, 2);
103 return 1;
104 }
105 lua_pushvalue(L, 1); /* pass error message */
106 lua_pushinteger(L, 2); /* skip this function and traceback */
107 lua_call(L, 2, 1); /* call debug.traceback */
108 return 1;
109}
110
111static int docall(lua_State *L, int narg, int clear)
112{
113 int status;
114 int base = lua_gettop(L) - narg; /* function index */
115 lua_pushcfunction(L, traceback); /* push traceback function */
116 lua_insert(L, base); /* put it under chunk and args */
117 signal(SIGINT, laction);
118 status = lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), base);
119 signal(SIGINT, SIG_DFL);
120 lua_remove(L, base); /* remove traceback function */
121 /* force a complete garbage collection in case of errors */
122 if (status != 0) lua_gc(L, LUA_GCCOLLECT, 0);
123 return status;
124}
125
126static void print_version(void)
127{
128 fprintf(stderr,
129 LUAJIT_VERSION " -- " LUAJIT_COPYRIGHT ". " LUAJIT_URL "\n");
130}
131
132static void print_jit_status(lua_State *L)
133{
134 int n;
135 const char *s;
136 lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
137 lua_getfield(L, -1, "jit"); /* Get jit.* module table. */
138 lua_remove(L, -2);
139 lua_getfield(L, -1, "status");
140 lua_remove(L, -2);
141 n = lua_gettop(L);
142 lua_call(L, 0, LUA_MULTRET);
143 fputs(lua_toboolean(L, n) ? "JIT: ON" : "JIT: OFF", stderr);
144 for (n++; (s = lua_tostring(L, n)); n++)
145 fprintf(stderr, " %s", s);
146 fputs("\n", stdout);
147}
148
149static int getargs(lua_State *L, char **argv, int n)
150{
151 int narg;
152 int i;
153 int argc = 0;
154 while (argv[argc]) argc++; /* count total number of arguments */
155 narg = argc - (n + 1); /* number of arguments to the script */
156 luaL_checkstack(L, narg + 3, "too many arguments to script");
157 for (i = n+1; i < argc; i++)
158 lua_pushstring(L, argv[i]);
159 lua_createtable(L, narg, n + 1);
160 for (i = 0; i < argc; i++) {
161 lua_pushstring(L, argv[i]);
162 lua_rawseti(L, -2, i - n);
163 }
164 return narg;
165}
166
167static int dofile(lua_State *L, const char *name)
168{
169 int status = luaL_loadfile(L, name) || docall(L, 0, 1);
170 return report(L, status);
171}
172
173static int dostring(lua_State *L, const char *s, const char *name)
174{
175 int status = luaL_loadbuffer(L, s, strlen(s), name) || docall(L, 0, 1);
176 return report(L, status);
177}
178
179static int dolibrary(lua_State *L, const char *name)
180{
181 lua_getglobal(L, "require");
182 lua_pushstring(L, name);
183 return report(L, docall(L, 1, 1));
184}
185
186static void write_prompt(lua_State *L, int firstline)
187{
188 const char *p;
189 lua_getfield(L, LUA_GLOBALSINDEX, firstline ? "_PROMPT" : "_PROMPT2");
190 p = lua_tostring(L, -1);
191 if (p == NULL) p = firstline ? LUA_PROMPT : LUA_PROMPT2;
192 fputs(p, stdout);
193 fflush(stdout);
194 lua_pop(L, 1); /* remove global */
195}
196
197static int incomplete(lua_State *L, int status)
198{
199 if (status == LUA_ERRSYNTAX) {
200 size_t lmsg;
201 const char *msg = lua_tolstring(L, -1, &lmsg);
202 const char *tp = msg + lmsg - (sizeof(LUA_QL("<eof>")) - 1);
203 if (strstr(msg, LUA_QL("<eof>")) == tp) {
204 lua_pop(L, 1);
205 return 1;
206 }
207 }
208 return 0; /* else... */
209}
210
211static int pushline(lua_State *L, int firstline)
212{
213 char buf[LUA_MAXINPUT];
214 write_prompt(L, firstline);
215 if (fgets(buf, LUA_MAXINPUT, stdin)) {
216 size_t len = strlen(buf);
217 if (len > 0 && buf[len-1] == '\n')
218 buf[len-1] = '\0';
219 if (firstline && buf[0] == '=')
220 lua_pushfstring(L, "return %s", buf+1);
221 else
222 lua_pushstring(L, buf);
223 return 1;
224 }
225 return 0;
226}
227
228static int loadline(lua_State *L)
229{
230 int status;
231 lua_settop(L, 0);
232 if (!pushline(L, 1))
233 return -1; /* no input */
234 for (;;) { /* repeat until gets a complete line */
235 status = luaL_loadbuffer(L, lua_tostring(L, 1), lua_strlen(L, 1), "=stdin");
236 if (!incomplete(L, status)) break; /* cannot try to add lines? */
237 if (!pushline(L, 0)) /* no more input? */
238 return -1;
239 lua_pushliteral(L, "\n"); /* add a new line... */
240 lua_insert(L, -2); /* ...between the two lines */
241 lua_concat(L, 3); /* join them */
242 }
243 lua_remove(L, 1); /* remove line */
244 return status;
245}
246
247static void dotty(lua_State *L)
248{
249 int status;
250 const char *oldprogname = progname;
251 progname = NULL;
252 while ((status = loadline(L)) != -1) {
253 if (status == 0) status = docall(L, 0, 0);
254 report(L, status);
255 if (status == 0 && lua_gettop(L) > 0) { /* any result to print? */
256 lua_getglobal(L, "print");
257 lua_insert(L, 1);
258 if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != 0)
259 l_message(progname,
260 lua_pushfstring(L, "error calling " LUA_QL("print") " (%s)",
261 lua_tostring(L, -1)));
262 }
263 }
264 lua_settop(L, 0); /* clear stack */
265 fputs("\n", stdout);
266 fflush(stdout);
267 progname = oldprogname;
268}
269
270static int handle_script(lua_State *L, char **argv, int n)
271{
272 int status;
273 const char *fname;
274 int narg = getargs(L, argv, n); /* collect arguments */
275 lua_setglobal(L, "arg");
276 fname = argv[n];
277 if (strcmp(fname, "-") == 0 && strcmp(argv[n-1], "--") != 0)
278 fname = NULL; /* stdin */
279 status = luaL_loadfile(L, fname);
280 lua_insert(L, -(narg+1));
281 if (status == 0)
282 status = docall(L, narg, 0);
283 else
284 lua_pop(L, narg);
285 return report(L, status);
286}
287
288/* Load add-on module. */
289static int loadjitmodule(lua_State *L, const char *notfound)
290{
291 lua_getglobal(L, "require");
292 lua_pushliteral(L, "jit.");
293 lua_pushvalue(L, -3);
294 lua_concat(L, 2);
295 if (lua_pcall(L, 1, 1, 0)) {
296 const char *msg = lua_tostring(L, -1);
297 if (msg && !strncmp(msg, "module ", 7)) {
298 err:
299 l_message(progname, notfound);
300 return 1;
301 } else {
302 return report(L, 1);
303 }
304 }
305 lua_getfield(L, -1, "start");
306 if (lua_isnil(L, -1)) goto err;
307 lua_remove(L, -2); /* Drop module table. */
308 return 0;
309}
310
311/* Run command with options. */
312static int runcmdopt(lua_State *L, const char *opt)
313{
314 int narg = 0;
315 if (opt && *opt) {
316 for (;;) { /* Split arguments. */
317 const char *p = strchr(opt, ',');
318 narg++;
319 if (!p) break;
320 if (p == opt)
321 lua_pushnil(L);
322 else
323 lua_pushlstring(L, opt, (size_t)(p - opt));
324 opt = p + 1;
325 }
326 if (*opt)
327 lua_pushstring(L, opt);
328 else
329 lua_pushnil(L);
330 }
331 return report(L, lua_pcall(L, narg, 0, 0));
332}
333
334/* JIT engine control command: try jit library first or load add-on module. */
335static int dojitcmd(lua_State *L, const char *cmd)
336{
337 const char *opt = strchr(cmd, '=');
338 lua_pushlstring(L, cmd, opt ? (size_t)(opt - cmd) : strlen(cmd));
339 lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
340 lua_getfield(L, -1, "jit"); /* Get jit.* module table. */
341 lua_remove(L, -2);
342 lua_pushvalue(L, -2);
343 lua_gettable(L, -2); /* Lookup library function. */
344 if (!lua_isfunction(L, -1)) {
345 lua_pop(L, 2); /* Drop non-function and jit.* table, keep module name. */
346 if (loadjitmodule(L, "unknown luaJIT command"))
347 return 1;
348 } else {
349 lua_remove(L, -2); /* Drop jit.* table. */
350 }
351 lua_remove(L, -2); /* Drop module name. */
352 return runcmdopt(L, opt ? opt+1 : opt);
353}
354
355/* Optimization flags. */
356static int dojitopt(lua_State *L, const char *opt)
357{
358 lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
359 lua_getfield(L, -1, "jit.opt"); /* Get jit.opt.* module table. */
360 lua_remove(L, -2);
361 lua_getfield(L, -1, "start");
362 lua_remove(L, -2);
363 return runcmdopt(L, opt);
364}
365
366/* check that argument has no extra characters at the end */
367#define notail(x) {if ((x)[2] != '\0') return -1;}
368
369static int collectargs(char **argv, int *pi, int *pv, int *pe)
370{
371 int i;
372 for (i = 1; argv[i] != NULL; i++) {
373 if (argv[i][0] != '-') /* not an option? */
374 return i;
375 switch (argv[i][1]) { /* option */
376 case '-':
377 notail(argv[i]);
378 return (argv[i+1] != NULL ? i+1 : 0);
379 case '\0':
380 return i;
381 case 'i':
382 notail(argv[i]);
383 *pi = 1; /* go through */
384 case 'v':
385 notail(argv[i]);
386 *pv = 1;
387 break;
388 case 'e':
389 *pe = 1; /* go through */
390 case 'j': /* LuaJIT extension */
391 case 'l':
392 if (argv[i][2] == '\0') {
393 i++;
394 if (argv[i] == NULL) return -1;
395 }
396 break;
397 case 'O': break; /* LuaJIT extension */
398 default: return -1; /* invalid option */
399 }
400 }
401 return 0;
402}
403
404static int runargs(lua_State *L, char **argv, int n)
405{
406 int i;
407 for (i = 1; i < n; i++) {
408 if (argv[i] == NULL) continue;
409 lua_assert(argv[i][0] == '-');
410 switch (argv[i][1]) { /* option */
411 case 'e': {
412 const char *chunk = argv[i] + 2;
413 if (*chunk == '\0') chunk = argv[++i];
414 lua_assert(chunk != NULL);
415 if (dostring(L, chunk, "=(command line)") != 0)
416 return 1;
417 break;
418 }
419 case 'l': {
420 const char *filename = argv[i] + 2;
421 if (*filename == '\0') filename = argv[++i];
422 lua_assert(filename != NULL);
423 if (dolibrary(L, filename))
424 return 1; /* stop if file fails */
425 break;
426 }
427 case 'j': { /* LuaJIT extension */
428 const char *cmd = argv[i] + 2;
429 if (*cmd == '\0') cmd = argv[++i];
430 lua_assert(cmd != NULL);
431 if (dojitcmd(L, cmd))
432 return 1;
433 break;
434 }
435 case 'O': /* LuaJIT extension */
436 if (dojitopt(L, argv[i] + 2))
437 return 1;
438 break;
439 default: break;
440 }
441 }
442 return 0;
443}
444
445static int handle_luainit(lua_State *L)
446{
447 const char *init = getenv(LUA_INIT);
448 if (init == NULL)
449 return 0; /* status OK */
450 else if (init[0] == '@')
451 return dofile(L, init+1);
452 else
453 return dostring(L, init, "=" LUA_INIT);
454}
455
456struct Smain {
457 int argc;
458 char **argv;
459 int status;
460};
461
462static int pmain(lua_State *L)
463{
464 struct Smain *s = (struct Smain *)lua_touserdata(L, 1);
465 char **argv = s->argv;
466 int script;
467 int has_i = 0, has_v = 0, has_e = 0;
468 globalL = L;
469 if (argv[0] && argv[0][0]) progname = argv[0];
470 LUAJIT_VERSION_SYM(); /* linker-enforced version check */
471 lua_gc(L, LUA_GCSTOP, 0); /* stop collector during initialization */
472 luaL_openlibs(L); /* open libraries */
473 lua_gc(L, LUA_GCRESTART, 0);
474 s->status = handle_luainit(L);
475 if (s->status != 0) return 0;
476 script = collectargs(argv, &has_i, &has_v, &has_e);
477 if (script < 0) { /* invalid args? */
478 print_usage();
479 s->status = 1;
480 return 0;
481 }
482 if (has_v) print_version();
483 s->status = runargs(L, argv, (script > 0) ? script : s->argc);
484 if (s->status != 0) return 0;
485 if (script)
486 s->status = handle_script(L, argv, script);
487 if (s->status != 0) return 0;
488 if (has_i) {
489 print_jit_status(L);
490 dotty(L);
491 } else if (script == 0 && !has_e && !has_v) {
492 if (lua_stdin_is_tty()) {
493 print_version();
494 print_jit_status(L);
495 dotty(L);
496 } else {
497 dofile(L, NULL); /* executes stdin as a file */
498 }
499 }
500 return 0;
501}
502
503int main(int argc, char **argv)
504{
505 int status;
506 struct Smain s;
507 lua_State *L = lua_open(); /* create state */
508 if (L == NULL) {
509 l_message(argv[0], "cannot create state: not enough memory");
510 return EXIT_FAILURE;
511 }
512 s.argc = argc;
513 s.argv = argv;
514 status = lua_cpcall(L, pmain, &s);
515 report(L, status);
516 lua_close(L);
517 return (status || s.status) ? EXIT_FAILURE : EXIT_SUCCESS;
518}
519