3 ** Copyright (C) 2005-2011 Mike Pall. See Copyright Notice in luajit.h
5 ** Major portions taken verbatim or adapted from the Lua interpreter.
6 ** Copyright (C) 1994-2011 Lua.org, PUC-Rio. See Copyright Notice in lua.h
20 /* ------------------------------------------------------------------------ */
22 /* Error codes for ll_loadfunc. */
23 #define PACKAGE_ERR_LIB 1
24 #define PACKAGE_ERR_FUNC 2
25 #define PACKAGE_ERR_LOAD 3
27 /* Redefined in platform specific part. */
28 #define PACKAGE_LIB_FAIL "open"
29 #define setprogdir(L) ((void)0)
31 /* Symbol name prefixes. */
32 #define SYMPREFIX_CF "luaopen_%s"
33 #define SYMPREFIX_BC "luaJIT_BC_%s"
39 static void ll_unloadlib(void *lib
)
44 static void *ll_load(lua_State
*L
, const char *path
)
46 void *lib
= dlopen(path
, RTLD_NOW
);
47 if (lib
== NULL
) lua_pushstring(L
, dlerror());
51 static lua_CFunction
ll_sym(lua_State
*L
, void *lib
, const char *sym
)
53 lua_CFunction f
= (lua_CFunction
)dlsym(lib
, sym
);
54 if (f
== NULL
) lua_pushstring(L
, dlerror());
58 static const char *ll_bcsym(void *lib
, const char *sym
)
60 #if defined(RTLD_DEFAULT)
61 if (lib
== NULL
) lib
= RTLD_DEFAULT
;
62 #elif LJ_TARGET_OSX || LJ_TARGET_BSD
63 if (lib
== NULL
) lib
= (void *)(intptr_t)-2;
65 return (const char *)dlsym(lib
, sym
);
68 #elif LJ_TARGET_WINDOWS
70 #define WIN32_LEAN_AND_MEAN
76 #ifndef GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
77 #define GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS 4
78 #define GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT 2
79 BOOL WINAPI
GetModuleHandleExA(DWORD
, LPCSTR
, HMODULE
*);
84 static void setprogdir(lua_State
*L
)
86 char buff
[MAX_PATH
+ 1];
88 DWORD nsize
= sizeof(buff
);
89 DWORD n
= GetModuleFileNameA(NULL
, buff
, nsize
);
90 if (n
== 0 || n
== nsize
|| (lb
= strrchr(buff
, '\\')) == NULL
) {
91 luaL_error(L
, "unable to get ModuleFileName");
94 luaL_gsub(L
, lua_tostring(L
, -1), LUA_EXECDIR
, buff
);
95 lua_remove(L
, -2); /* remove original string */
99 static void pusherror(lua_State
*L
)
101 DWORD error
= GetLastError();
103 if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS
| FORMAT_MESSAGE_FROM_SYSTEM
,
104 NULL
, error
, 0, buffer
, sizeof(buffer
), NULL
))
105 lua_pushstring(L
, buffer
);
107 lua_pushfstring(L
, "system error %d\n", error
);
110 static void ll_unloadlib(void *lib
)
112 FreeLibrary((HINSTANCE
)lib
);
115 static void *ll_load(lua_State
*L
, const char *path
)
117 HINSTANCE lib
= LoadLibraryA(path
);
118 if (lib
== NULL
) pusherror(L
);
122 static lua_CFunction
ll_sym(lua_State
*L
, void *lib
, const char *sym
)
124 lua_CFunction f
= (lua_CFunction
)GetProcAddress((HINSTANCE
)lib
, sym
);
125 if (f
== NULL
) pusherror(L
);
129 static const char *ll_bcsym(void *lib
, const char *sym
)
132 return (const char *)GetProcAddress((HINSTANCE
)lib
, sym
);
134 HINSTANCE h
= GetModuleHandleA(NULL
);
135 const char *p
= (const char *)GetProcAddress(h
, sym
);
136 if (p
== NULL
&& GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
|GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT
,
137 (const char *)ll_bcsym
, &h
))
138 p
= (const char *)GetProcAddress(h
, sym
);
145 #undef PACKAGE_LIB_FAIL
146 #define PACKAGE_LIB_FAIL "absent"
148 #define DLMSG "dynamic libraries not enabled; no support for target OS"
150 static void ll_unloadlib(void *lib
)
155 static void *ll_load(lua_State
*L
, const char *path
)
158 lua_pushliteral(L
, DLMSG
);
162 static lua_CFunction
ll_sym(lua_State
*L
, void *lib
, const char *sym
)
164 (void)lib
; (void)sym
;
165 lua_pushliteral(L
, DLMSG
);
169 static const char *ll_bcsym(void *lib
, const char *sym
)
171 (void)lib
; (void)sym
;
177 /* ------------------------------------------------------------------------ */
179 static void **ll_register(lua_State
*L
, const char *path
)
182 lua_pushfstring(L
, "LOADLIB: %s", path
);
183 lua_gettable(L
, LUA_REGISTRYINDEX
); /* check library in registry? */
184 if (!lua_isnil(L
, -1)) { /* is there an entry? */
185 plib
= (void **)lua_touserdata(L
, -1);
186 } else { /* no entry yet; create one */
188 plib
= (void **)lua_newuserdata(L
, sizeof(void *));
190 luaL_getmetatable(L
, "_LOADLIB");
191 lua_setmetatable(L
, -2);
192 lua_pushfstring(L
, "LOADLIB: %s", path
);
193 lua_pushvalue(L
, -2);
194 lua_settable(L
, LUA_REGISTRYINDEX
);
199 static const char *mksymname(lua_State
*L
, const char *modname
,
202 const char *funcname
;
203 const char *mark
= strchr(modname
, *LUA_IGMARK
);
204 if (mark
) modname
= mark
+ 1;
205 funcname
= luaL_gsub(L
, modname
, ".", "_");
206 funcname
= lua_pushfstring(L
, prefix
, funcname
);
207 lua_remove(L
, -2); /* remove 'gsub' result */
211 static int ll_loadfunc(lua_State
*L
, const char *path
, const char *name
, int r
)
213 void **reg
= ll_register(L
, path
);
214 if (*reg
== NULL
) *reg
= ll_load(L
, path
);
216 return PACKAGE_ERR_LIB
; /* unable to load library */
218 const char *sym
= r
? name
: mksymname(L
, name
, SYMPREFIX_CF
);
219 lua_CFunction f
= ll_sym(L
, *reg
, sym
);
221 lua_pushcfunction(L
, f
);
225 const char *bcdata
= ll_bcsym(*reg
, mksymname(L
, name
, SYMPREFIX_BC
));
228 if (luaL_loadbuffer(L
, bcdata
, ~(size_t)0, name
) != 0)
229 return PACKAGE_ERR_LOAD
;
233 return PACKAGE_ERR_FUNC
; /* unable to find function */
237 static int lj_cf_package_loadlib(lua_State
*L
)
239 const char *path
= luaL_checkstring(L
, 1);
240 const char *init
= luaL_checkstring(L
, 2);
241 int st
= ll_loadfunc(L
, path
, init
, 1);
242 if (st
== 0) { /* no errors? */
243 return 1; /* return the loaded function */
244 } else { /* error; error message is on stack top */
247 lua_pushstring(L
, (st
== PACKAGE_ERR_LIB
) ? PACKAGE_LIB_FAIL
: "init");
248 return 3; /* return nil, error message, and where */
252 static int lj_cf_package_unloadlib(lua_State
*L
)
254 void **lib
= (void **)luaL_checkudata(L
, 1, "_LOADLIB");
255 if (*lib
) ll_unloadlib(*lib
);
256 *lib
= NULL
; /* mark library as closed */
260 /* ------------------------------------------------------------------------ */
262 static int readable(const char *filename
)
264 FILE *f
= fopen(filename
, "r"); /* try to open file */
265 if (f
== NULL
) return 0; /* open failed */
270 static const char *pushnexttemplate(lua_State
*L
, const char *path
)
273 while (*path
== *LUA_PATHSEP
) path
++; /* skip separators */
274 if (*path
== '\0') return NULL
; /* no more templates */
275 l
= strchr(path
, *LUA_PATHSEP
); /* find next separator */
276 if (l
== NULL
) l
= path
+ strlen(path
);
277 lua_pushlstring(L
, path
, (size_t)(l
- path
)); /* template */
281 static const char *searchpath (lua_State
*L
, const char *name
,
284 name
= luaL_gsub(L
, name
, ".", LUA_DIRSEP
);
285 lua_pushliteral(L
, ""); /* error accumulator */
286 while ((path
= pushnexttemplate(L
, path
)) != NULL
) {
287 const char *filename
= luaL_gsub(L
, lua_tostring(L
, -1),
288 LUA_PATH_MARK
, name
);
289 lua_remove(L
, -2); /* remove path template */
290 if (readable(filename
)) /* does file exist and is readable? */
291 return filename
; /* return that file name */
292 lua_pushfstring(L
, "\n\tno file " LUA_QS
, filename
);
293 lua_remove(L
, -2); /* remove file name */
294 lua_concat(L
, 2); /* add entry to possible error message */
296 return NULL
; /* not found */
299 static int lj_cf_package_searchpath(lua_State
*L
)
301 const char *f
= searchpath(L
, luaL_checkstring(L
, 1), luaL_checkstring(L
, 2));
304 } else { /* error message is on top of the stack */
307 return 2; /* return nil + error message */
311 static const char *findfile(lua_State
*L
, const char *name
,
315 lua_getfield(L
, LUA_ENVIRONINDEX
, pname
);
316 path
= lua_tostring(L
, -1);
318 luaL_error(L
, LUA_QL("package.%s") " must be a string", pname
);
319 return searchpath(L
, name
, path
);
322 static void loaderror(lua_State
*L
, const char *filename
)
324 luaL_error(L
, "error loading module " LUA_QS
" from file " LUA_QS
":\n\t%s",
325 lua_tostring(L
, 1), filename
, lua_tostring(L
, -1));
328 static int lj_cf_package_loader_lua(lua_State
*L
)
330 const char *filename
;
331 const char *name
= luaL_checkstring(L
, 1);
332 filename
= findfile(L
, name
, "path");
333 if (filename
== NULL
) return 1; /* library not found in this path */
334 if (luaL_loadfile(L
, filename
) != 0)
335 loaderror(L
, filename
);
336 return 1; /* library loaded successfully */
339 static int lj_cf_package_loader_c(lua_State
*L
)
341 const char *name
= luaL_checkstring(L
, 1);
342 const char *filename
= findfile(L
, name
, "cpath");
343 if (filename
== NULL
) return 1; /* library not found in this path */
344 if (ll_loadfunc(L
, filename
, name
, 0) != 0)
345 loaderror(L
, filename
);
346 return 1; /* library loaded successfully */
349 static int lj_cf_package_loader_croot(lua_State
*L
)
351 const char *filename
;
352 const char *name
= luaL_checkstring(L
, 1);
353 const char *p
= strchr(name
, '.');
355 if (p
== NULL
) return 0; /* is root */
356 lua_pushlstring(L
, name
, (size_t)(p
- name
));
357 filename
= findfile(L
, lua_tostring(L
, -1), "cpath");
358 if (filename
== NULL
) return 1; /* root not found */
359 if ((st
= ll_loadfunc(L
, filename
, name
, 0)) != 0) {
360 if (st
!= PACKAGE_ERR_FUNC
) loaderror(L
, filename
); /* real error */
361 lua_pushfstring(L
, "\n\tno module " LUA_QS
" in file " LUA_QS
,
363 return 1; /* function not found */
368 static int lj_cf_package_loader_preload(lua_State
*L
)
370 const char *name
= luaL_checkstring(L
, 1);
371 lua_getfield(L
, LUA_ENVIRONINDEX
, "preload");
372 if (!lua_istable(L
, -1))
373 luaL_error(L
, LUA_QL("package.preload") " must be a table");
374 lua_getfield(L
, -1, name
);
375 if (lua_isnil(L
, -1)) { /* Not found? */
376 const char *bcname
= mksymname(L
, name
, SYMPREFIX_BC
);
377 const char *bcdata
= ll_bcsym(NULL
, bcname
);
378 if (bcdata
== NULL
|| luaL_loadbuffer(L
, bcdata
, ~(size_t)0, name
) != 0)
379 lua_pushfstring(L
, "\n\tno field package.preload['%s']", name
);
384 /* ------------------------------------------------------------------------ */
386 static const int sentinel_
= 0;
387 #define sentinel ((void *)&sentinel_)
389 static int lj_cf_package_require(lua_State
*L
)
391 const char *name
= luaL_checkstring(L
, 1);
393 lua_settop(L
, 1); /* _LOADED table will be at index 2 */
394 lua_getfield(L
, LUA_REGISTRYINDEX
, "_LOADED");
395 lua_getfield(L
, 2, name
);
396 if (lua_toboolean(L
, -1)) { /* is it there? */
397 if (lua_touserdata(L
, -1) == sentinel
) /* check loops */
398 luaL_error(L
, "loop or previous error loading module " LUA_QS
, name
);
399 return 1; /* package is already loaded */
401 /* else must load it; iterate over available loaders */
402 lua_getfield(L
, LUA_ENVIRONINDEX
, "loaders");
403 if (!lua_istable(L
, -1))
404 luaL_error(L
, LUA_QL("package.loaders") " must be a table");
405 lua_pushliteral(L
, ""); /* error message accumulator */
407 lua_rawgeti(L
, -2, i
); /* get a loader */
408 if (lua_isnil(L
, -1))
409 luaL_error(L
, "module " LUA_QS
" not found:%s",
410 name
, lua_tostring(L
, -2));
411 lua_pushstring(L
, name
);
412 lua_call(L
, 1, 1); /* call it */
413 if (lua_isfunction(L
, -1)) /* did it find module? */
414 break; /* module loaded successfully */
415 else if (lua_isstring(L
, -1)) /* loader returned error message? */
416 lua_concat(L
, 2); /* accumulate it */
420 lua_pushlightuserdata(L
, sentinel
);
421 lua_setfield(L
, 2, name
); /* _LOADED[name] = sentinel */
422 lua_pushstring(L
, name
); /* pass name as argument to module */
423 lua_call(L
, 1, 1); /* run loaded module */
424 if (!lua_isnil(L
, -1)) /* non-nil return? */
425 lua_setfield(L
, 2, name
); /* _LOADED[name] = returned value */
426 lua_getfield(L
, 2, name
);
427 if (lua_touserdata(L
, -1) == sentinel
) { /* module did not set a value? */
428 lua_pushboolean(L
, 1); /* use true as result */
429 lua_pushvalue(L
, -1); /* extra copy to be returned */
430 lua_setfield(L
, 2, name
); /* _LOADED[name] = true */
436 /* ------------------------------------------------------------------------ */
438 static void setfenv(lua_State
*L
)
441 if (lua_getstack(L
, 1, &ar
) == 0 ||
442 lua_getinfo(L
, "f", &ar
) == 0 || /* get calling function */
443 lua_iscfunction(L
, -1))
444 luaL_error(L
, LUA_QL("module") " not called from a Lua function");
445 lua_pushvalue(L
, -2);
450 static void dooptions(lua_State
*L
, int n
)
453 for (i
= 2; i
<= n
; i
++) {
454 lua_pushvalue(L
, i
); /* get option (a function) */
455 lua_pushvalue(L
, -2); /* module */
460 static void modinit(lua_State
*L
, const char *modname
)
463 lua_pushvalue(L
, -1);
464 lua_setfield(L
, -2, "_M"); /* module._M = module */
465 lua_pushstring(L
, modname
);
466 lua_setfield(L
, -2, "_NAME");
467 dot
= strrchr(modname
, '.'); /* look for last dot in module name */
468 if (dot
== NULL
) dot
= modname
; else dot
++;
469 /* set _PACKAGE as package name (full module name minus last part) */
470 lua_pushlstring(L
, modname
, (size_t)(dot
- modname
));
471 lua_setfield(L
, -2, "_PACKAGE");
474 static int lj_cf_package_module(lua_State
*L
)
476 const char *modname
= luaL_checkstring(L
, 1);
477 int loaded
= lua_gettop(L
) + 1; /* index of _LOADED table */
478 lua_getfield(L
, LUA_REGISTRYINDEX
, "_LOADED");
479 lua_getfield(L
, loaded
, modname
); /* get _LOADED[modname] */
480 if (!lua_istable(L
, -1)) { /* not found? */
481 lua_pop(L
, 1); /* remove previous result */
482 /* try global variable (and create one if it does not exist) */
483 if (luaL_findtable(L
, LUA_GLOBALSINDEX
, modname
, 1) != NULL
)
484 lj_err_callerv(L
, LJ_ERR_BADMODN
, modname
);
485 lua_pushvalue(L
, -1);
486 lua_setfield(L
, loaded
, modname
); /* _LOADED[modname] = new table */
488 /* check whether table already has a _NAME field */
489 lua_getfield(L
, -1, "_NAME");
490 if (!lua_isnil(L
, -1)) { /* is table an initialized module? */
492 } else { /* no; initialize it */
496 lua_pushvalue(L
, -1);
498 dooptions(L
, loaded
- 1);
502 static int lj_cf_package_seeall(lua_State
*L
)
504 luaL_checktype(L
, 1, LUA_TTABLE
);
505 if (!lua_getmetatable(L
, 1)) {
506 lua_createtable(L
, 0, 1); /* create new metatable */
507 lua_pushvalue(L
, -1);
508 lua_setmetatable(L
, 1);
510 lua_pushvalue(L
, LUA_GLOBALSINDEX
);
511 lua_setfield(L
, -2, "__index"); /* mt.__index = _G */
515 /* ------------------------------------------------------------------------ */
519 static void setpath(lua_State
*L
, const char *fieldname
, const char *envname
,
522 const char *path
= getenv(envname
);
524 lua_pushstring(L
, def
);
526 path
= luaL_gsub(L
, path
, LUA_PATHSEP LUA_PATHSEP
,
527 LUA_PATHSEP AUXMARK LUA_PATHSEP
);
528 luaL_gsub(L
, path
, AUXMARK
, def
);
532 lua_setfield(L
, -2, fieldname
);
535 static const luaL_Reg package_lib
[] = {
536 { "loadlib", lj_cf_package_loadlib
},
537 { "searchpath", lj_cf_package_searchpath
},
538 { "seeall", lj_cf_package_seeall
},
542 static const luaL_Reg package_global
[] = {
543 { "module", lj_cf_package_module
},
544 { "require", lj_cf_package_require
},
548 static const lua_CFunction package_loaders
[] =
550 lj_cf_package_loader_preload
,
551 lj_cf_package_loader_lua
,
552 lj_cf_package_loader_c
,
553 lj_cf_package_loader_croot
,
557 LUALIB_API
int luaopen_package(lua_State
*L
)
560 luaL_newmetatable(L
, "_LOADLIB");
561 lj_lib_pushcf(L
, lj_cf_package_unloadlib
, 1);
562 lua_setfield(L
, -2, "__gc");
563 luaL_register(L
, LUA_LOADLIBNAME
, package_lib
);
564 lua_pushvalue(L
, -1);
565 lua_replace(L
, LUA_ENVIRONINDEX
);
566 lua_createtable(L
, sizeof(package_loaders
)/sizeof(package_loaders
[0])-1, 0);
567 for (i
= 0; package_loaders
[i
] != NULL
; i
++) {
568 lj_lib_pushcf(L
, package_loaders
[i
], 1);
569 lua_rawseti(L
, -2, i
+1);
571 lua_setfield(L
, -2, "loaders");
572 setpath(L
, "path", LUA_PATH
, LUA_PATH_DEFAULT
);
573 setpath(L
, "cpath", LUA_CPATH
, LUA_CPATH_DEFAULT
);
574 lua_pushliteral(L
, LUA_PATH_CONFIG
);
575 lua_setfield(L
, -2, "config");
576 luaL_findtable(L
, LUA_REGISTRYINDEX
, "_LOADED", 16);
577 lua_setfield(L
, -2, "loaded");
578 luaL_findtable(L
, LUA_REGISTRYINDEX
, "_PRELOAD", 4);
579 lua_setfield(L
, -2, "preload");
580 lua_pushvalue(L
, LUA_GLOBALSINDEX
);
581 luaL_register(L
, NULL
, package_global
);