/* Module definition and import implementation */ #include "Python.h" #include "Python-ast.h"#include "pyarena.h"#include "pythonrun.h"#include "errcode.h"#include "marshal.h"#include "code.h"#include "compile.h"#include "eval.h"#include "osdefs.h"#include "importdl.h" #ifdef HAVE_FCNTL_H#include <fcntl.h>#endif#ifdef __cplusplusextern "C" { #endif extern time_t PyOS_GetLastModificationTime(char *, FILE *);						/* In getmtime.c */ /* Magic word to reject .pyc files generated by other Python versions.   It should change for each incompatible change to the bytecode.    The value of CR and LF is incorporated so if you ever read or write   a .pyc file in text mode the magic number will be wrong; also, the   Apple MPW compiler swaps their values, botching string constants.    The magic numbers must be spaced apart atleast 2 values, as the   -U interpeter flag will cause MAGIC+1 being used. They have been   odd numbers for some time now.    There were a variety of old schemes for setting the magic number.   The current working scheme is to increment the previous value by   10.    Known values:       Python 1.5:   20121       Python 1.5.1: 20121       Python 1.5.2: 20121       Python 1.6:   50428       Python 2.0:   50823       Python 2.0.1: 50823       Python 2.1:   60202       Python 2.1.1: 60202       Python 2.1.2: 60202       Python 2.2:   60717       Python 2.3a0: 62011       Python 2.3a0: 62021       Python 2.3a0: 62011 (!)       Python 2.4a0: 62041       Python 2.4a3: 62051       Python 2.4b1: 62061       Python 2.5a0: 62071       Python 2.5a0: 62081 (ast-branch)       Python 2.5a0: 62091 (with)       Python 2.5a0: 62092 (changed WITH_CLEANUP opcode)       Python 2.5b3: 62101 (fix wrong code: for x, in ...)       Python 2.5b3: 62111 (fix wrong code: x += yield)       Python 2.5c1: 62121 (fix wrong lnotab with for loops and       			    storing constants that should have been removed)       Python 2.5c2: 62131 (fix wrong code: for x, in ... in listcomp/genexp).*/#define MAGIC (62131 | ((long)'\r'<<16) | ((long)'\n'<<24)) /* Magic word as global; note that _PyImport_Init() can change the   value of this global to accommodate for alterations of how the   compiler works which are enabled by command line switches. */static long pyc_magic = MAGIC; /* See _PyImport_FixupExtension() below */static PyObject *extensions = NULL; /* This table is defined in config.c: */extern struct _inittab _PyImport_Inittab[]; struct _inittab *PyImport_Inittab = _PyImport_Inittab; /* these tables define the module suffixes that Python recognizes */struct filedescr * _PyImport_Filetab = NULL; #ifdef RISCOSstatic const struct filedescr _PyImport_StandardFiletab[] = {	{"/py", "U", PY_SOURCE},	{"/pyc", "rb", PY_COMPILED},	{0, 0}};#elsestatic const struct filedescr _PyImport_StandardFiletab[] = {	{".py", "U", PY_SOURCE},#ifdef MS_WINDOWS	{".pyw", "U", PY_SOURCE},#endif	{".pyc", "rb", PY_COMPILED},	{0, 0}};#endif static PyTypeObject NullImporterType;	/* Forward reference */ /* Initialize things */ void_PyImport_Init(void){	const struct filedescr *scan;	struct filedescr *filetab;	int countD = 0;	int countS = 0; 	/* prepare _PyImport_Filetab: copy entries from	   _PyImport_DynLoadFiletab and _PyImport_StandardFiletab.	 */	for (scan = _PyImport_DynLoadFiletab; scan->suffix != NULL; ++scan)		++countD;	for (scan = _PyImport_StandardFiletab; scan->suffix != NULL; ++scan)		++countS;	filetab = PyMem_NEW(struct filedescr, countD + countS + 1);	if (filetab == NULL)		Py_FatalError("Can't initialize import file table.");	memcpy(filetab, _PyImport_DynLoadFiletab,	       countD * sizeof(struct filedescr));	memcpy(filetab + countD, _PyImport_StandardFiletab,	       countS * sizeof(struct filedescr));	filetab[countD + countS].suffix = NULL; 	_PyImport_Filetab = filetab; 	if (Py_OptimizeFlag) {		/* Replace ".pyc" with ".pyo" in _PyImport_Filetab */		for (; filetab->suffix != NULL; filetab++) {#ifndef RISCOS			if (strcmp(filetab->suffix, ".pyc") == 0)				filetab->suffix = ".pyo";#else			if (strcmp(filetab->suffix, "/pyc") == 0)				filetab->suffix = "/pyo";#endif		}	} 	if (Py_UnicodeFlag) {		/* Fix the pyc_magic so that byte compiled code created		   using the all-Unicode method doesn't interfere with		   code created in normal operation mode. */		pyc_magic = MAGIC + 1;	}} void_PyImportHooks_Init(void){	PyObject *v, *path_hooks = NULL, *zimpimport;	int err = 0; 	/* adding sys.path_hooks and sys.path_importer_cache, setting up	   zipimport */	if (PyType_Ready(&NullImporterType) < 0)		goto error; 	if (Py_VerboseFlag)		PySys_WriteStderr("# installing zipimport hook\n"); 	v = PyList_New(0);	if (v == NULL)		goto error;	err = PySys_SetObject("meta_path", v);	Py_DECREF(v);	if (err)		goto error;	v = PyDict_New();	if (v == NULL)		goto error;	err = PySys_SetObject("path_importer_cache", v);	Py_DECREF(v);	if (err)		goto error;	path_hooks = PyList_New(0);	if (path_hooks == NULL)		goto error;	err = PySys_SetObject("path_hooks", path_hooks);	if (err) {  error:		PyErr_Print();		Py_FatalError("initializing sys.meta_path, sys.path_hooks, "			      "path_importer_cache, or NullImporter failed"			      );	} 	zimpimport = PyImport_ImportModule("zipimport");	if (zimpimport == NULL) {		PyErr_Clear(); /* No zip import module -- okay */		if (Py_VerboseFlag)			PySys_WriteStderr("# can't import zipimport\n");	}	else {		PyObject *zipimporter = PyObject_GetAttrString(zimpimport,							       "zipimporter");		Py_DECREF(zimpimport);		if (zipimporter == NULL) {			PyErr_Clear(); /* No zipimporter object -- okay */			if (Py_VerboseFlag)				PySys_WriteStderr(				    "# can't import zipimport.zipimporter\n");		}		else {			/* sys.path_hooks.append(zipimporter) */			err = PyList_Append(path_hooks, zipimporter);			Py_DECREF(zipimporter);			if (err)				goto error;			if (Py_VerboseFlag)				PySys_WriteStderr(					"# installed zipimport hook\n");		}	}	Py_DECREF(path_hooks);} void_PyImport_Fini(void){	Py_XDECREF(extensions);	extensions = NULL;	PyMem_DEL(_PyImport_Filetab);	_PyImport_Filetab = NULL;}  /* Locking primitives to prevent parallel imports of the same module   in different threads to return with a partially loaded module.   These calls are serialized by the global interpreter lock. */ #ifdef WITH_THREAD #include "pythread.h" static PyThread_type_lock import_lock = 0;static long import_lock_thread = -1;static int import_lock_level = 0; static voidlock_import(void){	long me = PyThread_get_thread_ident();	if (me == -1)		return; /* Too bad */	if (import_lock == NULL) {		import_lock = PyThread_allocate_lock();		if (import_lock == NULL)			return;  /* Nothing much we can do. */	}	if (import_lock_thread == me) {		import_lock_level++;		return;	}	if (import_lock_thread != -1 || !PyThread_acquire_lock(import_lock, 0))	{		PyThreadState *tstate = PyEval_SaveThread();		PyThread_acquire_lock(import_lock, 1);		PyEval_RestoreThread(tstate);	}	import_lock_thread = me;	import_lock_level = 1;} static intunlock_import(void){	long me = PyThread_get_thread_ident();	if (me == -1 || import_lock == NULL)		return 0; /* Too bad */	if (import_lock_thread != me)		return -1;	import_lock_level--;	if (import_lock_level == 0) {		import_lock_thread = -1;		PyThread_release_lock(import_lock);	}	return 1;} /* This function is called from PyOS_AfterFork to ensure that newly   created child processes do not share locks with the parent. */ void_PyImport_ReInitLock(void){#ifdef _AIX	if (import_lock != NULL)		import_lock = PyThread_allocate_lock();#endif} #else #define lock_import()#define unlock_import() 0 #endif static PyObject *imp_lock_held(PyObject *self, PyObject *noargs){#ifdef WITH_THREAD	return PyBool_FromLong(import_lock_thread != -1);#else	return PyBool_FromLong(0);#endif} static PyObject *imp_acquire_lock(PyObject *self, PyObject *noargs){#ifdef WITH_THREAD	lock_import();#endif	Py_INCREF(Py_None);	return Py_None;} static PyObject *imp_release_lock(PyObject *self, PyObject *noargs){#ifdef WITH_THREAD	if (unlock_import() < 0) {		PyErr_SetString(PyExc_RuntimeError,				"not holding the import lock");		return NULL;	}#endif	Py_INCREF(Py_None);	return Py_None;} static voidimp_modules_reloading_clear (void){	PyInterpreterState *interp = PyThreadState_Get()->interp;	if (interp->modules_reloading == NULL)		return;	PyDict_Clear(interp->modules_reloading);	return;} /* Helper for sys */ PyObject *PyImport_GetModuleDict(void){	PyInterpreterState *interp = PyThreadState_GET()->interp;	if (interp->modules == NULL)		Py_FatalError("PyImport_GetModuleDict: no module dictionary!");	return interp->modules;}  /* List of names to clear in sys */static char* sys_deletes[] = {	"path", "argv", "ps1", "ps2", "exitfunc",	"exc_type", "exc_value", "exc_traceback",	"last_type", "last_value", "last_traceback",	"path_hooks", "path_importer_cache", "meta_path",	NULL}; static char* sys_files[] = {	"stdin", "__stdin__",	"stdout", "__stdout__",	"stderr", "__stderr__",	NULL};  /* Un-initialize things, as good as we can */ voidPyImport_Cleanup(void){	Py_ssize_t pos, ndone;	char *name;	PyObject *key, *value, *dict;	PyInterpreterState *interp = PyThreadState_GET()->interp;	PyObject *modules = interp->modules; 	if (modules == NULL)		return; /* Already done */ 	/* Delete some special variables first.  These are common	   places where user values hide and people complain when their	   destructors fail.  Since the modules containing them are	   deleted *last* of all, they would come too late in the normal	   destruction order.  Sigh. */ 	value = PyDict_GetItemString(modules, "__builtin__");	if (value != NULL && PyModule_Check(value)) {		dict = PyModule_GetDict(value);		if (Py_VerboseFlag)			PySys_WriteStderr("# clear __builtin__._\n");		PyDict_SetItemString(dict, "_", Py_None);	}	value = PyDict_GetItemString(modules, "sys");	if (value != NULL && PyModule_Check(value)) {		char **p;		PyObject *v;		dict = PyModule_GetDict(value);		for (p = sys_deletes; *p != NULL; p++) {			if (Py_VerboseFlag)				PySys_WriteStderr("# clear sys.%s\n", *p);			PyDict_SetItemString(dict, *p, Py_None);		}		for (p = sys_files; *p != NULL; p+=2) {			if (Py_VerboseFlag)				PySys_WriteStderr("# restore sys.%s\n", *p);			v = PyDict_GetItemString(dict, *(p+1));			if (v == NULL)				v = Py_None;			PyDict_SetItemString(dict, *p, v);		}	} 	/* First, delete __main__ */	value = PyDict_GetItemString(modules, "__main__");	if (value != NULL && PyModule_Check(value)) {		if (Py_VerboseFlag)			PySys_WriteStderr("# cleanup __main__\n");		_PyModule_Clear(value);		PyDict_SetItemString(modules, "__main__", Py_None);	} 	/* The special treatment of __builtin__ here is because even	   when it's not referenced as a module, its dictionary is	   referenced by almost every module's __builtins__.  Since	   deleting a module clears its dictionary (even if there are	   references left to it), we need to delete the __builtin__	   module last.  Likewise, we don't delete sys until the very	   end because it is implicitly referenced (e.g. by print). 	   Also note that we 'delete' modules by replacing their entry	   in the modules dict with None, rather than really deleting	   them; this avoids a rehash of the modules dictionary and	   also marks them as "non existent" so they won't be	   re-imported. */ 	/* Next, repeatedly delete modules with a reference count of	   one (skipping __builtin__ and sys) and delete them */	do {		ndone = 0;		pos = 0;		while (PyDict_Next(modules, &pos, &key, &value)) {			if (value->ob_refcnt != 1)				continue;			if (PyString_Check(key) && PyModule_Check(value)) {				name = PyString_AS_STRING(key);				if (strcmp(name, "__builtin__") == 0)					continue;				if (strcmp(name, "sys") == 0)					continue;				if (Py_VerboseFlag)					PySys_WriteStderr(						"# cleanup[1] %s\n", name);				_PyModule_Clear(value);				PyDict_SetItem(modules, key, Py_None);				ndone++;			}		}	} while (ndone > 0); 	/* Next, delete all modules (still skipping __builtin__ and sys) */	pos = 0;	while (PyDict_Next(modules, &pos, &key, &value)) {		if (PyString_Check(key) && PyModule_Check(value)) {			name = PyString_AS_STRING(key);			if (strcmp(name, "__builtin__") == 0)				continue;			if (strcmp(name, "sys") == 0)				continue;			if (Py_VerboseFlag)				PySys_WriteStderr("# cleanup[2] %s\n", name);			_PyModule_Clear(value);			PyDict_SetItem(modules, key, Py_None);		}	} 	/* Next, delete sys and __builtin__ (in that order) */	value = PyDict_GetItemString(modules, "sys");	if (value != NULL && PyModule_Check(value)) {		if (Py_VerboseFlag)			PySys_WriteStderr("# cleanup sys\n");		_PyModule_Clear(value);		PyDict_SetItemString(modules, "sys", Py_None);	}	value = PyDict_GetItemString(modules, "__builtin__");	if (value != NULL && PyModule_Check(value)) {

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