diff options
Diffstat (limited to 'lua/loadlib.c')
| -rw-r--r-- | lua/loadlib.c | 258 |
1 files changed, 160 insertions, 98 deletions
diff --git a/lua/loadlib.c b/lua/loadlib.c index bedbea3..7911928 100644 --- a/lua/loadlib.c +++ b/lua/loadlib.c @@ -1,5 +1,5 @@ /* -** $Id: loadlib.c,v 1.111.1.1 2013/04/12 18:48:47 roberto Exp $ +** $Id: loadlib.c,v 1.127 2015/11/23 11:30:45 roberto Exp $ ** Dynamic library loader for Lua ** See Copyright Notice in lua.h ** @@ -8,22 +8,16 @@ ** systems. */ +#define loadlib_c +#define LUA_LIB -/* -** if needed, includes windows header before everything else -*/ -#if defined(_WIN32) -#include <windows.h> -#endif +#include "lprefix.h" +#include <stdio.h> #include <stdlib.h> #include <string.h> - -#define loadlib_c -#define LUA_LIB - #include "lua.h" #include "lauxlib.h" @@ -31,21 +25,21 @@ /* -** LUA_PATH and LUA_CPATH are the names of the environment +** LUA_PATH_VAR and LUA_CPATH_VAR are the names of the environment ** variables that Lua check to set its paths. */ -#if !defined(LUA_PATH) -#define LUA_PATH "LUA_PATH" +#if !defined(LUA_PATH_VAR) +#define LUA_PATH_VAR "LUA_PATH" #endif -#if !defined(LUA_CPATH) -#define LUA_CPATH "LUA_CPATH" +#if !defined(LUA_CPATH_VAR) +#define LUA_CPATH_VAR "LUA_CPATH" #endif #define LUA_PATHSUFFIX "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR -#define LUA_PATHVERSION LUA_PATH LUA_PATHSUFFIX -#define LUA_CPATHVERSION LUA_CPATH LUA_PATHSUFFIX +#define LUA_PATHVARVERSION LUA_PATH_VAR LUA_PATHSUFFIX +#define LUA_CPATHVARVERSION LUA_CPATH_VAR LUA_PATHSUFFIX /* ** LUA_PATH_SEP is the character that separates templates in a path. @@ -92,29 +86,45 @@ #define LUA_OFSEP "_" -/* table (in the registry) that keeps handles for all loaded C libraries */ -#define CLIBS "_CLIBS" +/* +** unique key for table in the registry that keeps handles +** for all loaded C libraries +*/ +static const int CLIBS = 0; #define LIB_FAIL "open" - -/* error codes for ll_loadfunc */ -#define ERRLIB 1 -#define ERRFUNC 2 - #define setprogdir(L) ((void)0) /* ** system-dependent functions */ -static void ll_unloadlib (void *lib); -static void *ll_load (lua_State *L, const char *path, int seeglb); -static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym); +/* +** unload library 'lib' +*/ +static void lsys_unloadlib (void *lib); + +/* +** load C library in file 'path'. If 'seeglb', load with all names in +** the library global. +** Returns the library; in case of error, returns NULL plus an +** error string in the stack. +*/ +static void *lsys_load (lua_State *L, const char *path, int seeglb); + +/* +** Try to find a function named 'sym' in library 'lib'. +** Returns the function; in case of error, returns NULL plus an +** error string in the stack. +*/ +static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym); -#if defined(LUA_USE_DLOPEN) + + +#if defined(LUA_USE_DLOPEN) /* { */ /* ** {======================================================================== ** This is an implementation of loadlib based on the dlfcn interface. @@ -126,20 +136,32 @@ static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym); #include <dlfcn.h> -static void ll_unloadlib (void *lib) { +/* +** Macro to convert pointer-to-void* to pointer-to-function. This cast +** is undefined according to ISO C, but POSIX assumes that it works. +** (The '__extension__' in gnu compilers is only to avoid warnings.) +*/ +#if defined(__GNUC__) +#define cast_func(p) (__extension__ (lua_CFunction)(p)) +#else +#define cast_func(p) ((lua_CFunction)(p)) +#endif + + +static void lsys_unloadlib (void *lib) { dlclose(lib); } -static void *ll_load (lua_State *L, const char *path, int seeglb) { +static void *lsys_load (lua_State *L, const char *path, int seeglb) { void *lib = dlopen(path, RTLD_NOW | (seeglb ? RTLD_GLOBAL : RTLD_LOCAL)); if (lib == NULL) lua_pushstring(L, dlerror()); return lib; } -static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) { - lua_CFunction f = (lua_CFunction)dlsym(lib, sym); +static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) { + lua_CFunction f = cast_func(dlsym(lib, sym)); if (f == NULL) lua_pushstring(L, dlerror()); return f; } @@ -148,13 +170,15 @@ static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) { -#elif defined(LUA_DL_DLL) +#elif defined(LUA_DL_DLL) /* }{ */ /* ** {====================================================================== ** This is an implementation of loadlib for Windows using native functions. ** ======================================================================= */ +#include <windows.h> + #undef setprogdir /* @@ -190,12 +214,12 @@ static void pusherror (lua_State *L) { lua_pushfstring(L, "system error %d\n", error); } -static void ll_unloadlib (void *lib) { +static void lsys_unloadlib (void *lib) { FreeLibrary((HMODULE)lib); } -static void *ll_load (lua_State *L, const char *path, int seeglb) { +static void *lsys_load (lua_State *L, const char *path, int seeglb) { HMODULE lib = LoadLibraryExA(path, NULL, LUA_LLE_FLAGS); (void)(seeglb); /* not used: symbols are 'global' by default */ if (lib == NULL) pusherror(L); @@ -203,7 +227,7 @@ static void *ll_load (lua_State *L, const char *path, int seeglb) { } -static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) { +static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) { lua_CFunction f = (lua_CFunction)GetProcAddress((HMODULE)lib, sym); if (f == NULL) pusherror(L); return f; @@ -212,7 +236,7 @@ static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) { /* }====================================================== */ -#else +#else /* }{ */ /* ** {====================================================== ** Fallback for other systems @@ -226,31 +250,34 @@ static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) { #define DLMSG "dynamic libraries not enabled; check your Lua installation" -static void ll_unloadlib (void *lib) { +static void lsys_unloadlib (void *lib) { (void)(lib); /* not used */ } -static void *ll_load (lua_State *L, const char *path, int seeglb) { +static void *lsys_load (lua_State *L, const char *path, int seeglb) { (void)(path); (void)(seeglb); /* not used */ lua_pushliteral(L, DLMSG); return NULL; } -static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) { +static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) { (void)(lib); (void)(sym); /* not used */ lua_pushliteral(L, DLMSG); return NULL; } /* }====================================================== */ -#endif +#endif /* } */ -static void *ll_checkclib (lua_State *L, const char *path) { +/* +** return registry.CLIBS[path] +*/ +static void *checkclib (lua_State *L, const char *path) { void *plib; - lua_getfield(L, LUA_REGISTRYINDEX, CLIBS); + lua_rawgetp(L, LUA_REGISTRYINDEX, &CLIBS); lua_getfield(L, -1, path); plib = lua_touserdata(L, -1); /* plib = CLIBS[path] */ lua_pop(L, 2); /* pop CLIBS table and 'plib' */ @@ -258,8 +285,12 @@ static void *ll_checkclib (lua_State *L, const char *path) { } -static void ll_addtoclib (lua_State *L, const char *path, void *plib) { - lua_getfield(L, LUA_REGISTRYINDEX, CLIBS); +/* +** registry.CLIBS[path] = plib -- for queries +** registry.CLIBS[#CLIBS + 1] = plib -- also keep a list of all libraries +*/ +static void addtoclib (lua_State *L, const char *path, void *plib) { + lua_rawgetp(L, LUA_REGISTRYINDEX, &CLIBS); lua_pushlightuserdata(L, plib); lua_pushvalue(L, -1); lua_setfield(L, -3, path); /* CLIBS[path] = plib */ @@ -269,33 +300,49 @@ static void ll_addtoclib (lua_State *L, const char *path, void *plib) { /* -** __gc tag method for CLIBS table: calls 'll_unloadlib' for all lib +** __gc tag method for CLIBS table: calls 'lsys_unloadlib' for all lib ** handles in list CLIBS */ static int gctm (lua_State *L) { - int n = luaL_len(L, 1); + lua_Integer n = luaL_len(L, 1); for (; n >= 1; n--) { /* for each handle, in reverse order */ lua_rawgeti(L, 1, n); /* get handle CLIBS[n] */ - ll_unloadlib(lua_touserdata(L, -1)); + lsys_unloadlib(lua_touserdata(L, -1)); lua_pop(L, 1); /* pop handle */ } return 0; } -static int ll_loadfunc (lua_State *L, const char *path, const char *sym) { - void *reg = ll_checkclib(L, path); /* check loaded C libraries */ + +/* error codes for 'lookforfunc' */ +#define ERRLIB 1 +#define ERRFUNC 2 + +/* +** Look for a C function named 'sym' in a dynamically loaded library +** 'path'. +** First, check whether the library is already loaded; if not, try +** to load it. +** Then, if 'sym' is '*', return true (as library has been loaded). +** Otherwise, look for symbol 'sym' in the library and push a +** C function with that symbol. +** Return 0 and 'true' or a function in the stack; in case of +** errors, return an error code and an error message in the stack. +*/ +static int lookforfunc (lua_State *L, const char *path, const char *sym) { + void *reg = checkclib(L, path); /* check loaded C libraries */ if (reg == NULL) { /* must load library? */ - reg = ll_load(L, path, *sym == '*'); + reg = lsys_load(L, path, *sym == '*'); /* global symbols if 'sym'=='*' */ if (reg == NULL) return ERRLIB; /* unable to load library */ - ll_addtoclib(L, path, reg); + addtoclib(L, path, reg); } if (*sym == '*') { /* loading only library (no function)? */ lua_pushboolean(L, 1); /* return 'true' */ return 0; /* no errors */ } else { - lua_CFunction f = ll_sym(L, reg, sym); + lua_CFunction f = lsys_sym(L, reg, sym); if (f == NULL) return ERRFUNC; /* unable to find function */ lua_pushcfunction(L, f); /* else create new function */ @@ -307,7 +354,7 @@ static int ll_loadfunc (lua_State *L, const char *path, const char *sym) { static int ll_loadlib (lua_State *L) { const char *path = luaL_checkstring(L, 1); const char *init = luaL_checkstring(L, 2); - int stat = ll_loadfunc(L, path, init); + int stat = lookforfunc(L, path, init); if (stat == 0) /* no errors? */ return 1; /* return the loaded function */ else { /* error; error message is on stack top */ @@ -360,7 +407,7 @@ static const char *searchpath (lua_State *L, const char *name, lua_remove(L, -2); /* remove path template */ if (readable(filename)) /* does file exist and is readable? */ return filename; /* return that file name */ - lua_pushfstring(L, "\n\tno file " LUA_QS, filename); + lua_pushfstring(L, "\n\tno file '%s'", filename); lua_remove(L, -2); /* remove file name */ luaL_addvalue(&msg); /* concatenate error msg. entry */ } @@ -390,7 +437,7 @@ static const char *findfile (lua_State *L, const char *name, lua_getfield(L, lua_upvalueindex(1), pname); path = lua_tostring(L, -1); if (path == NULL) - luaL_error(L, LUA_QL("package.%s") " must be a string", pname); + luaL_error(L, "'package.%s' must be a string", pname); return searchpath(L, name, path, ".", dirsep); } @@ -401,8 +448,7 @@ static int checkload (lua_State *L, int stat, const char *filename) { return 2; /* return open function and file name */ } else - return luaL_error(L, "error loading module " LUA_QS - " from file " LUA_QS ":\n\t%s", + return luaL_error(L, "error loading module '%s' from file '%s':\n\t%s", lua_tostring(L, 1), filename, lua_tostring(L, -1)); } @@ -416,21 +462,29 @@ static int searcher_Lua (lua_State *L) { } +/* +** Try to find a load function for module 'modname' at file 'filename'. +** First, change '.' to '_' in 'modname'; then, if 'modname' has +** the form X-Y (that is, it has an "ignore mark"), build a function +** name "luaopen_X" and look for it. (For compatibility, if that +** fails, it also tries "luaopen_Y".) If there is no ignore mark, +** look for a function named "luaopen_modname". +*/ static int loadfunc (lua_State *L, const char *filename, const char *modname) { - const char *funcname; + const char *openfunc; const char *mark; modname = luaL_gsub(L, modname, ".", LUA_OFSEP); mark = strchr(modname, *LUA_IGMARK); if (mark) { int stat; - funcname = lua_pushlstring(L, modname, mark - modname); - funcname = lua_pushfstring(L, LUA_POF"%s", funcname); - stat = ll_loadfunc(L, filename, funcname); + openfunc = lua_pushlstring(L, modname, mark - modname); + openfunc = lua_pushfstring(L, LUA_POF"%s", openfunc); + stat = lookforfunc(L, filename, openfunc); if (stat != ERRFUNC) return stat; modname = mark + 1; /* else go ahead and try old-style name */ } - funcname = lua_pushfstring(L, LUA_POF"%s", modname); - return ll_loadfunc(L, filename, funcname); + openfunc = lua_pushfstring(L, LUA_POF"%s", modname); + return lookforfunc(L, filename, openfunc); } @@ -455,8 +509,7 @@ static int searcher_Croot (lua_State *L) { if (stat != ERRFUNC) return checkload(L, 0, filename); /* real error */ else { /* open function not found */ - lua_pushfstring(L, "\n\tno module " LUA_QS " in file " LUA_QS, - name, filename); + lua_pushfstring(L, "\n\tno module '%s' in file '%s'", name, filename); return 1; } } @@ -468,8 +521,7 @@ static int searcher_Croot (lua_State *L) { static int searcher_preload (lua_State *L) { const char *name = luaL_checkstring(L, 1); lua_getfield(L, LUA_REGISTRYINDEX, "_PRELOAD"); - lua_getfield(L, -1, name); - if (lua_isnil(L, -1)) /* not found? */ + if (lua_getfield(L, -1, name) == LUA_TNIL) /* not found? */ lua_pushfstring(L, "\n\tno field package.preload['%s']", name); return 1; } @@ -479,17 +531,15 @@ static void findloader (lua_State *L, const char *name) { int i; luaL_Buffer msg; /* to build error message */ luaL_buffinit(L, &msg); - lua_getfield(L, lua_upvalueindex(1), "searchers"); /* will be at index 3 */ - if (!lua_istable(L, 3)) - luaL_error(L, LUA_QL("package.searchers") " must be a table"); + /* push 'package.searchers' to index 3 in the stack */ + if (lua_getfield(L, lua_upvalueindex(1), "searchers") != LUA_TTABLE) + luaL_error(L, "'package.searchers' must be a table"); /* iterate over available searchers to find a loader */ for (i = 1; ; i++) { - lua_rawgeti(L, 3, i); /* get a searcher */ - if (lua_isnil(L, -1)) { /* no more searchers? */ + if (lua_rawgeti(L, 3, i) == LUA_TNIL) { /* no more searchers? */ lua_pop(L, 1); /* remove nil */ luaL_pushresult(&msg); /* create error message */ - luaL_error(L, "module " LUA_QS " not found:%s", - name, lua_tostring(L, -1)); + luaL_error(L, "module '%s' not found:%s", name, lua_tostring(L, -1)); } lua_pushstring(L, name); lua_call(L, 1, 2); /* call it */ @@ -520,8 +570,7 @@ static int ll_require (lua_State *L) { lua_call(L, 2, 1); /* run loader to load module */ if (!lua_isnil(L, -1)) /* non-nil return? */ lua_setfield(L, 2, name); /* _LOADED[name] = returned value */ - lua_getfield(L, 2, name); - if (lua_isnil(L, -1)) { /* module did not set a value? */ + if (lua_getfield(L, 2, name) == LUA_TNIL) { /* module set no value? */ lua_pushboolean(L, 1); /* use true as result */ lua_pushvalue(L, -1); /* extra copy to be returned */ lua_setfield(L, 2, name); /* _LOADED[name] = true */ @@ -548,7 +597,7 @@ static void set_env (lua_State *L) { if (lua_getstack(L, 1, &ar) == 0 || lua_getinfo(L, "f", &ar) == 0 || /* get calling function */ lua_iscfunction(L, -1)) - luaL_error(L, LUA_QL("module") " not called from a Lua function"); + luaL_error(L, "'module' not called from a Lua function"); lua_pushvalue(L, -2); /* copy new environment table to top */ lua_setupvalue(L, -2, 1); lua_pop(L, 1); /* remove function */ @@ -587,9 +636,8 @@ static int ll_module (lua_State *L) { int lastarg = lua_gettop(L); /* last parameter */ luaL_pushmodule(L, modname, 1); /* get/create module table */ /* check whether table already has a _NAME field */ - lua_getfield(L, -1, "_NAME"); - if (!lua_isnil(L, -1)) /* is table an initialized module? */ - lua_pop(L, 1); + if (lua_getfield(L, -1, "_NAME") != LUA_TNIL) + lua_pop(L, 1); /* table is an initialized module */ else { /* no; initialize it */ lua_pop(L, 1); modinit(L, modname); @@ -659,6 +707,12 @@ static const luaL_Reg pk_funcs[] = { #if defined(LUA_COMPAT_MODULE) {"seeall", ll_seeall}, #endif + /* placeholders */ + {"preload", NULL}, + {"cpath", NULL}, + {"path", NULL}, + {"searchers", NULL}, + {"loaded", NULL}, {NULL, NULL} }; @@ -678,42 +732,50 @@ static void createsearcherstable (lua_State *L) { int i; /* create 'searchers' table */ lua_createtable(L, sizeof(searchers)/sizeof(searchers[0]) - 1, 0); - /* fill it with pre-defined searchers */ + /* fill it with predefined searchers */ for (i=0; searchers[i] != NULL; i++) { lua_pushvalue(L, -2); /* set 'package' as upvalue for all searchers */ lua_pushcclosure(L, searchers[i], 1); lua_rawseti(L, -2, i+1); } +#if defined(LUA_COMPAT_LOADERS) + lua_pushvalue(L, -1); /* make a copy of 'searchers' table */ + lua_setfield(L, -3, "loaders"); /* put it in field 'loaders' */ +#endif + lua_setfield(L, -2, "searchers"); /* put it in field 'searchers' */ } -LUAMOD_API int luaopen_package (lua_State *L) { - /* create table CLIBS to keep track of loaded C libraries */ - luaL_getsubtable(L, LUA_REGISTRYINDEX, CLIBS); - lua_createtable(L, 0, 1); /* metatable for CLIBS */ +/* +** create table CLIBS to keep track of loaded C libraries, +** setting a finalizer to close all libraries when closing state. +*/ +static void createclibstable (lua_State *L) { + lua_newtable(L); /* create CLIBS table */ + lua_createtable(L, 0, 1); /* create metatable for CLIBS */ lua_pushcfunction(L, gctm); lua_setfield(L, -2, "__gc"); /* set finalizer for CLIBS table */ lua_setmetatable(L, -2); - /* create `package' table */ - luaL_newlib(L, pk_funcs); + lua_rawsetp(L, LUA_REGISTRYINDEX, &CLIBS); /* set CLIBS table in registry */ +} + + +LUAMOD_API int luaopen_package (lua_State *L) { + createclibstable(L); + luaL_newlib(L, pk_funcs); /* create 'package' table */ createsearcherstable(L); -#if defined(LUA_COMPAT_LOADERS) - lua_pushvalue(L, -1); /* make a copy of 'searchers' table */ - lua_setfield(L, -3, "loaders"); /* put it in field `loaders' */ -#endif - lua_setfield(L, -2, "searchers"); /* put it in field 'searchers' */ /* set field 'path' */ - setpath(L, "path", LUA_PATHVERSION, LUA_PATH, LUA_PATH_DEFAULT); + setpath(L, "path", LUA_PATHVARVERSION, LUA_PATH_VAR, LUA_PATH_DEFAULT); /* set field 'cpath' */ - setpath(L, "cpath", LUA_CPATHVERSION, LUA_CPATH, LUA_CPATH_DEFAULT); + setpath(L, "cpath", LUA_CPATHVARVERSION, LUA_CPATH_VAR, LUA_CPATH_DEFAULT); /* store config information */ lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATH_SEP "\n" LUA_PATH_MARK "\n" LUA_EXEC_DIR "\n" LUA_IGMARK "\n"); lua_setfield(L, -2, "config"); - /* set field `loaded' */ + /* set field 'loaded' */ luaL_getsubtable(L, LUA_REGISTRYINDEX, "_LOADED"); lua_setfield(L, -2, "loaded"); - /* set field `preload' */ + /* set field 'preload' */ luaL_getsubtable(L, LUA_REGISTRYINDEX, "_PRELOAD"); lua_setfield(L, -2, "preload"); lua_pushglobaltable(L); |