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pylifecycle.c
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/* Python interpreter top-level routines, including init/exit */
#include "Python.h"
#include "Python-ast.h"
#undef Yield /* undefine macro conflicting with winbase.h */
#include "grammar.h"
#include "node.h"
#include "token.h"
#include "parsetok.h"
#include "errcode.h"
#include "code.h"
#include "symtable.h"
#include "ast.h"
#include "marshal.h"
#include "osdefs.h"
#include <locale.h>
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef MS_WINDOWS
#include "malloc.h" /* for alloca */
#endif
#ifdef HAVE_LANGINFO_H
#include <langinfo.h>
#endif
#ifdef MS_WINDOWS
#undef BYTE
#include "windows.h"
extern PyTypeObject PyWindowsConsoleIO_Type;
#define PyWindowsConsoleIO_Check(op) (PyObject_TypeCheck((op), &PyWindowsConsoleIO_Type))
#endif
_Py_IDENTIFIER(flush);
_Py_IDENTIFIER(name);
_Py_IDENTIFIER(stdin);
_Py_IDENTIFIER(stdout);
_Py_IDENTIFIER(stderr);
#ifdef __cplusplus
extern "C" {
#endif
extern wchar_t *Py_GetPath(void);
extern grammar _PyParser_Grammar; /* From graminit.c */
/* Forward */
static void initmain(PyInterpreterState *interp);
static int initfsencoding(PyInterpreterState *interp);
static void initsite(void);
static int initstdio(void);
static void initsigs(void);
static void call_py_exitfuncs(void);
static void wait_for_thread_shutdown(void);
static void call_ll_exitfuncs(void);
extern int _PyUnicode_Init(void);
extern int _PyStructSequence_Init(void);
extern void _PyUnicode_Fini(void);
extern int _PyLong_Init(void);
extern void PyLong_Fini(void);
extern int _PyFaulthandler_Init(void);
extern void _PyFaulthandler_Fini(void);
extern void _PyHash_Fini(void);
extern int _PyTraceMalloc_Init(void);
extern int _PyTraceMalloc_Fini(void);
extern void _Py_ReadyTypes(void);
#ifdef WITH_THREAD
extern void _PyGILState_Init(PyInterpreterState *, PyThreadState *);
extern void _PyGILState_Fini(void);
#endif /* WITH_THREAD */
/* Global configuration variable declarations are in pydebug.h */
/* XXX (ncoghlan): move those declarations to pylifecycle.h? */
int Py_DebugFlag; /* Needed by parser.c */
int Py_VerboseFlag; /* Needed by import.c */
int Py_QuietFlag; /* Needed by sysmodule.c */
int Py_InteractiveFlag; /* Needed by Py_FdIsInteractive() below */
int Py_InspectFlag; /* Needed to determine whether to exit at SystemExit */
int Py_OptimizeFlag = 0; /* Needed by compile.c */
int Py_NoSiteFlag; /* Suppress 'import site' */
int Py_BytesWarningFlag; /* Warn on str(bytes) and str(buffer) */
int Py_UseClassExceptionsFlag = 1; /* Needed by bltinmodule.c: deprecated */
int Py_FrozenFlag; /* Needed by getpath.c */
int Py_IgnoreEnvironmentFlag; /* e.g. PYTHONPATH, PYTHONHOME */
int Py_DontWriteBytecodeFlag; /* Suppress writing bytecode files (*.pyc) */
int Py_NoUserSiteDirectory = 0; /* for -s and site.py */
int Py_UnbufferedStdioFlag = 0; /* Unbuffered binary std{in,out,err} */
int Py_HashRandomizationFlag = 0; /* for -R and PYTHONHASHSEED */
int Py_IsolatedFlag = 0; /* for -I, isolate from user's env */
#ifdef MS_WINDOWS
int Py_LegacyWindowsFSEncodingFlag = 0; /* Uses mbcs instead of utf-8 */
int Py_LegacyWindowsStdioFlag = 0; /* Uses FileIO instead of WindowsConsoleIO */
#endif
PyThreadState *_Py_Finalizing = NULL;
/* Hack to force loading of object files */
int (*_PyOS_mystrnicmp_hack)(const char *, const char *, Py_ssize_t) = \
PyOS_mystrnicmp; /* Python/pystrcmp.o */
/* PyModule_GetWarningsModule is no longer necessary as of 2.6
since _warnings is builtin. This API should not be used. */
PyObject *
PyModule_GetWarningsModule(void)
{
return PyImport_ImportModule("warnings");
}
/* APIs to access the initialization flags
*
* Can be called prior to Py_Initialize.
*/
int _Py_CoreInitialized = 0;
int _Py_Initialized = 0;
int
_Py_IsCoreInitialized(void)
{
return _Py_CoreInitialized;
}
int
Py_IsInitialized(void)
{
return _Py_Initialized;
}
/* Helper to allow an embedding application to override the normal
* mechanism that attempts to figure out an appropriate IO encoding
*/
static char *_Py_StandardStreamEncoding = NULL;
static char *_Py_StandardStreamErrors = NULL;
int
Py_SetStandardStreamEncoding(const char *encoding, const char *errors)
{
if (Py_IsInitialized()) {
/* This is too late to have any effect */
return -1;
}
/* Can't call PyErr_NoMemory() on errors, as Python hasn't been
* initialised yet.
*
* However, the raw memory allocators are initialised appropriately
* as C static variables, so _PyMem_RawStrdup is OK even though
* Py_Initialize hasn't been called yet.
*/
if (encoding) {
_Py_StandardStreamEncoding = _PyMem_RawStrdup(encoding);
if (!_Py_StandardStreamEncoding) {
return -2;
}
}
if (errors) {
_Py_StandardStreamErrors = _PyMem_RawStrdup(errors);
if (!_Py_StandardStreamErrors) {
if (_Py_StandardStreamEncoding) {
PyMem_RawFree(_Py_StandardStreamEncoding);
}
return -3;
}
}
#ifdef MS_WINDOWS
if (_Py_StandardStreamEncoding) {
/* Overriding the stream encoding implies legacy streams */
Py_LegacyWindowsStdioFlag = 1;
}
#endif
return 0;
}
/* Global initializations. Can be undone by Py_FinalizeEx(). Don't
call this twice without an intervening Py_FinalizeEx() call. When
initializations fail, a fatal error is issued and the function does
not return. On return, the first thread and interpreter state have
been created.
Locking: you must hold the interpreter lock while calling this.
(If the lock has not yet been initialized, that's equivalent to
having the lock, but you cannot use multiple threads.)
*/
static int
add_flag(int flag, const char *envs)
{
int env = atoi(envs);
if (flag < env)
flag = env;
if (flag < 1)
flag = 1;
return flag;
}
static char*
get_codec_name(const char *encoding)
{
const char *name_utf8;
char *name_str;
PyObject *codec, *name = NULL;
codec = _PyCodec_Lookup(encoding);
if (!codec)
goto error;
name = _PyObject_GetAttrId(codec, &PyId_name);
Py_CLEAR(codec);
if (!name)
goto error;
name_utf8 = PyUnicode_AsUTF8(name);
if (name_utf8 == NULL)
goto error;
name_str = _PyMem_RawStrdup(name_utf8);
Py_DECREF(name);
if (name_str == NULL) {
PyErr_NoMemory();
return NULL;
}
return name_str;
error:
Py_XDECREF(codec);
Py_XDECREF(name);
return NULL;
}
static char*
get_locale_encoding(void)
{
#ifdef MS_WINDOWS
char codepage[100];
PyOS_snprintf(codepage, sizeof(codepage), "cp%d", GetACP());
return get_codec_name(codepage);
#elif defined(HAVE_LANGINFO_H) && defined(CODESET)
char* codeset = nl_langinfo(CODESET);
if (!codeset || codeset[0] == '\0') {
PyErr_SetString(PyExc_ValueError, "CODESET is not set or empty");
return NULL;
}
return get_codec_name(codeset);
#elif defined(__ANDROID__)
return get_codec_name("UTF-8");
#else
PyErr_SetNone(PyExc_NotImplementedError);
return NULL;
#endif
}
static void
initimport(PyInterpreterState *interp, PyObject *sysmod)
{
PyObject *importlib;
PyObject *impmod;
PyObject *sys_modules;
PyObject *value;
/* Import _importlib through its frozen version, _frozen_importlib. */
if (PyImport_ImportFrozenModule("_frozen_importlib") <= 0) {
Py_FatalError("Py_Initialize: can't import _frozen_importlib");
}
else if (Py_VerboseFlag) {
PySys_FormatStderr("import _frozen_importlib # frozen\n");
}
importlib = PyImport_AddModule("_frozen_importlib");
if (importlib == NULL) {
Py_FatalError("Py_Initialize: couldn't get _frozen_importlib from "
"sys.modules");
}
interp->importlib = importlib;
Py_INCREF(interp->importlib);
interp->import_func = PyDict_GetItemString(interp->builtins, "__import__");
if (interp->import_func == NULL)
Py_FatalError("Py_Initialize: __import__ not found");
Py_INCREF(interp->import_func);
/* Import the _imp module */
impmod = PyInit_imp();
if (impmod == NULL) {
Py_FatalError("Py_Initialize: can't import _imp");
}
else if (Py_VerboseFlag) {
PySys_FormatStderr("import _imp # builtin\n");
}
sys_modules = PyImport_GetModuleDict();
if (Py_VerboseFlag) {
PySys_FormatStderr("import sys # builtin\n");
}
if (PyDict_SetItemString(sys_modules, "_imp", impmod) < 0) {
Py_FatalError("Py_Initialize: can't save _imp to sys.modules");
}
/* Install importlib as the implementation of import */
value = PyObject_CallMethod(importlib, "_install", "OO", sysmod, impmod);
if (value != NULL)
value = PyObject_CallMethod(importlib,
"_install_external_importers", "");
if (value == NULL) {
PyErr_Print();
Py_FatalError("Py_Initialize: importlib install failed");
}
Py_DECREF(value);
Py_DECREF(impmod);
_PyImportZip_Init();
}
static void
initexternalimport(PyInterpreterState *interp)
{
PyObject *value;
value = PyObject_CallMethod(interp->importlib,
"_install_external_importers", "");
if (value == NULL) {
PyErr_Print();
Py_FatalError("Py_EndInitialization: external importer setup failed");
}
}
/* Global initializations. Can be undone by Py_Finalize(). Don't
call this twice without an intervening Py_Finalize() call.
Every call to Py_InitializeCore, Py_Initialize or Py_InitializeEx
must have a corresponding call to Py_Finalize.
Locking: you must hold the interpreter lock while calling these APIs.
(If the lock has not yet been initialized, that's equivalent to
having the lock, but you cannot use multiple threads.)
*/
/* Begin interpreter initialization
*
* On return, the first thread and interpreter state have been created,
* but the compiler, signal handling, multithreading and
* multiple interpreter support, and codec infrastructure are not yet
* available.
*
* The import system will support builtin and frozen modules only.
* The only supported io is writing to sys.stderr
*
* If any operation invoked by this function fails, a fatal error is
* issued and the function does not return.
*
* Any code invoked from this function should *not* assume it has access
* to the Python C API (unless the API is explicitly listed as being
* safe to call without calling Py_Initialize first)
*/
/* TODO: Progresively move functionality from Py_BeginInitialization to
* Py_ReadConfig and Py_EndInitialization
*/
void _Py_InitializeCore(const _PyCoreConfig *config)
{
PyInterpreterState *interp;
PyThreadState *tstate;
PyObject *bimod, *sysmod, *pstderr;
char *p;
_PyCoreConfig core_config = _PyCoreConfig_INIT;
_PyMainInterpreterConfig preinit_config = _PyMainInterpreterConfig_INIT;
if (config != NULL) {
core_config = *config;
}
if (_Py_Initialized) {
Py_FatalError("Py_InitializeCore: main interpreter already initialized");
}
if (_Py_CoreInitialized) {
Py_FatalError("Py_InitializeCore: runtime core already initialized");
}
/* Py_Finalize leaves _Py_Finalizing set in order to help daemon
* threads behave a little more gracefully at interpreter shutdown.
* We clobber it here so the new interpreter can start with a clean
* slate.
*
* However, this may still lead to misbehaviour if there are daemon
* threads still hanging around from a previous Py_Initialize/Finalize
* pair :(
*/
_Py_Finalizing = NULL;
#ifdef HAVE_SETLOCALE
/* Set up the LC_CTYPE locale, so we can obtain
the locale's charset without having to switch
locales. */
setlocale(LC_CTYPE, "");
#endif
if ((p = Py_GETENV("PYTHONDEBUG")) && *p != '\0')
Py_DebugFlag = add_flag(Py_DebugFlag, p);
if ((p = Py_GETENV("PYTHONVERBOSE")) && *p != '\0')
Py_VerboseFlag = add_flag(Py_VerboseFlag, p);
if ((p = Py_GETENV("PYTHONOPTIMIZE")) && *p != '\0')
Py_OptimizeFlag = add_flag(Py_OptimizeFlag, p);
if ((p = Py_GETENV("PYTHONDONTWRITEBYTECODE")) && *p != '\0')
Py_DontWriteBytecodeFlag = add_flag(Py_DontWriteBytecodeFlag, p);
/* The variable is only tested for existence here;
_Py_HashRandomization_Init will check its value further. */
if ((p = Py_GETENV("PYTHONHASHSEED")) && *p != '\0')
Py_HashRandomizationFlag = add_flag(Py_HashRandomizationFlag, p);
#ifdef MS_WINDOWS
if ((p = Py_GETENV("PYTHONLEGACYWINDOWSFSENCODING")) && *p != '\0')
Py_LegacyWindowsFSEncodingFlag = add_flag(Py_LegacyWindowsFSEncodingFlag, p);
if ((p = Py_GETENV("PYTHONLEGACYWINDOWSSTDIO")) && *p != '\0')
Py_LegacyWindowsStdioFlag = add_flag(Py_LegacyWindowsStdioFlag, p);
#endif
_Py_HashRandomization_Init(&core_config);
if (!core_config.use_hash_seed || core_config.hash_seed) {
/* Random or non-zero hash seed */
Py_HashRandomizationFlag = 1;
}
_PyInterpreterState_Init();
interp = PyInterpreterState_New();
if (interp == NULL)
Py_FatalError("Py_InitializeCore: can't make main interpreter");
interp->core_config = core_config;
interp->config = preinit_config;
tstate = PyThreadState_New(interp);
if (tstate == NULL)
Py_FatalError("Py_InitializeCore: can't make first thread");
(void) PyThreadState_Swap(tstate);
#ifdef WITH_THREAD
/* We can't call _PyEval_FiniThreads() in Py_FinalizeEx because
destroying the GIL might fail when it is being referenced from
another running thread (see issue #9901).
Instead we destroy the previously created GIL here, which ensures
that we can call Py_Initialize / Py_FinalizeEx multiple times. */
_PyEval_FiniThreads();
/* Auto-thread-state API */
_PyGILState_Init(interp, tstate);
#endif /* WITH_THREAD */
_Py_ReadyTypes();
if (!_PyFrame_Init())
Py_FatalError("Py_InitializeCore: can't init frames");
if (!_PyLong_Init())
Py_FatalError("Py_InitializeCore: can't init longs");
if (!PyByteArray_Init())
Py_FatalError("Py_InitializeCore: can't init bytearray");
if (!_PyFloat_Init())
Py_FatalError("Py_InitializeCore: can't init float");
interp->modules = PyDict_New();
if (interp->modules == NULL)
Py_FatalError("Py_InitializeCore: can't make modules dictionary");
/* Init Unicode implementation; relies on the codec registry */
if (_PyUnicode_Init() < 0)
Py_FatalError("Py_InitializeCore: can't initialize unicode");
if (_PyStructSequence_Init() < 0)
Py_FatalError("Py_InitializeCore: can't initialize structseq");
bimod = _PyBuiltin_Init();
if (bimod == NULL)
Py_FatalError("Py_InitializeCore: can't initialize builtins modules");
_PyImport_FixupBuiltin(bimod, "builtins");
interp->builtins = PyModule_GetDict(bimod);
if (interp->builtins == NULL)
Py_FatalError("Py_InitializeCore: can't initialize builtins dict");
Py_INCREF(interp->builtins);
/* initialize builtin exceptions */
_PyExc_Init(bimod);
sysmod = _PySys_BeginInit();
if (sysmod == NULL)
Py_FatalError("Py_InitializeCore: can't initialize sys");
interp->sysdict = PyModule_GetDict(sysmod);
if (interp->sysdict == NULL)
Py_FatalError("Py_InitializeCore: can't initialize sys dict");
Py_INCREF(interp->sysdict);
_PyImport_FixupBuiltin(sysmod, "sys");
PyDict_SetItemString(interp->sysdict, "modules",
interp->modules);
/* Set up a preliminary stderr printer until we have enough
infrastructure for the io module in place. */
pstderr = PyFile_NewStdPrinter(fileno(stderr));
if (pstderr == NULL)
Py_FatalError("Py_InitializeCore: can't set preliminary stderr");
_PySys_SetObjectId(&PyId_stderr, pstderr);
PySys_SetObject("__stderr__", pstderr);
Py_DECREF(pstderr);
_PyImport_Init();
_PyImportHooks_Init();
/* Initialize _warnings. */
_PyWarnings_Init();
/* This call sets up builtin and frozen import support */
if (!interp->core_config._disable_importlib) {
initimport(interp, sysmod);
}
/* Only when we get here is the runtime core fully initialized */
_Py_CoreInitialized = 1;
}
/* Read configuration settings from standard locations
*
* This function doesn't make any changes to the interpreter state - it
* merely populates any missing configuration settings. This allows an
* embedding application to completely override a config option by
* setting it before calling this function, or else modify the default
* setting before passing the fully populated config to Py_EndInitialization.
*
* More advanced selective initialization tricks are possible by calling
* this function multiple times with various preconfigured settings.
*/
int _Py_ReadMainInterpreterConfig(_PyMainInterpreterConfig *config)
{
/* Signal handlers are installed by default */
if (config->install_signal_handlers < 0) {
config->install_signal_handlers = 1;
}
return 0;
}
/* Update interpreter state based on supplied configuration settings
*
* After calling this function, most of the restrictions on the interpreter
* are lifted. The only remaining incomplete settings are those related
* to the main module (sys.argv[0], __main__ metadata)
*
* Calling this when the interpreter is not initializing, is already
* initialized or without a valid current thread state is a fatal error.
* Other errors should be reported as normal Python exceptions with a
* non-zero return code.
*/
int _Py_InitializeMainInterpreter(const _PyMainInterpreterConfig *config)
{
PyInterpreterState *interp;
PyThreadState *tstate;
if (!_Py_CoreInitialized) {
Py_FatalError("Py_InitializeMainInterpreter: runtime core not initialized");
}
if (_Py_Initialized) {
Py_FatalError("Py_InitializeMainInterpreter: main interpreter already initialized");
}
/* Get current thread state and interpreter pointer */
tstate = PyThreadState_GET();
if (!tstate)
Py_FatalError("Py_InitializeMainInterpreter: failed to read thread state");
interp = tstate->interp;
if (!interp)
Py_FatalError("Py_InitializeMainInterpreter: failed to get interpreter");
/* Now finish configuring the main interpreter */
interp->config = *config;
if (interp->core_config._disable_importlib) {
/* Special mode for freeze_importlib: run with no import system
*
* This means anything which needs support from extension modules
* or pure Python code in the standard library won't work.
*/
_Py_Initialized = 1;
return 0;
}
/* TODO: Report exceptions rather than fatal errors below here */
if (_PyTime_Init() < 0)
Py_FatalError("Py_InitializeMainInterpreter: can't initialize time");
/* Finish setting up the sys module and import system */
/* GetPath may initialize state that _PySys_EndInit locks
in, and so has to be called first. */
/* TODO: Call Py_GetPath() in Py_ReadConfig, rather than here */
PySys_SetPath(Py_GetPath());
if (_PySys_EndInit(interp->sysdict) < 0)
Py_FatalError("Py_InitializeMainInterpreter: can't finish initializing sys");
initexternalimport(interp);
/* initialize the faulthandler module */
if (_PyFaulthandler_Init())
Py_FatalError("Py_InitializeMainInterpreter: can't initialize faulthandler");
if (initfsencoding(interp) < 0)
Py_FatalError("Py_InitializeMainInterpreter: unable to load the file system codec");
if (config->install_signal_handlers)
initsigs(); /* Signal handling stuff, including initintr() */
if (_PyTraceMalloc_Init() < 0)
Py_FatalError("Py_InitializeMainInterpreter: can't initialize tracemalloc");
initmain(interp); /* Module __main__ */
if (initstdio() < 0)
Py_FatalError(
"Py_InitializeMainInterpreter: can't initialize sys standard streams");
/* Initialize warnings. */
if (PySys_HasWarnOptions()) {
PyObject *warnings_module = PyImport_ImportModule("warnings");
if (warnings_module == NULL) {
fprintf(stderr, "'import warnings' failed; traceback:\n");
PyErr_Print();
}
Py_XDECREF(warnings_module);
}
_Py_Initialized = 1;
if (!Py_NoSiteFlag)
initsite(); /* Module site */
return 0;
}
#undef _INIT_DEBUG_PRINT
void
_Py_InitializeEx_Private(int install_sigs, int install_importlib)
{
_PyCoreConfig core_config = _PyCoreConfig_INIT;
_PyMainInterpreterConfig config = _PyMainInterpreterConfig_INIT;
/* TODO: Moar config options! */
core_config.ignore_environment = Py_IgnoreEnvironmentFlag;
core_config._disable_importlib = !install_importlib;
config.install_signal_handlers = install_sigs;
_Py_InitializeCore(&core_config);
/* TODO: Print any exceptions raised by these operations */
if (_Py_ReadMainInterpreterConfig(&config))
Py_FatalError("Py_Initialize: Py_ReadMainInterpreterConfig failed");
if (_Py_InitializeMainInterpreter(&config))
Py_FatalError("Py_Initialize: Py_InitializeMainInterpreter failed");
}
void
Py_InitializeEx(int install_sigs)
{
_Py_InitializeEx_Private(install_sigs, 1);
}
void
Py_Initialize(void)
{
Py_InitializeEx(1);
}
#ifdef COUNT_ALLOCS
extern void dump_counts(FILE*);
#endif
/* Flush stdout and stderr */
static int
file_is_closed(PyObject *fobj)
{
int r;
PyObject *tmp = PyObject_GetAttrString(fobj, "closed");
if (tmp == NULL) {
PyErr_Clear();
return 0;
}
r = PyObject_IsTrue(tmp);
Py_DECREF(tmp);
if (r < 0)
PyErr_Clear();
return r > 0;
}
static int
flush_std_files(void)
{
PyObject *fout = _PySys_GetObjectId(&PyId_stdout);
PyObject *ferr = _PySys_GetObjectId(&PyId_stderr);
PyObject *tmp;
int status = 0;
if (fout != NULL && fout != Py_None && !file_is_closed(fout)) {
tmp = _PyObject_CallMethodId(fout, &PyId_flush, NULL);
if (tmp == NULL) {
PyErr_WriteUnraisable(fout);
status = -1;
}
else
Py_DECREF(tmp);
}
if (ferr != NULL && ferr != Py_None && !file_is_closed(ferr)) {
tmp = _PyObject_CallMethodId(ferr, &PyId_flush, NULL);
if (tmp == NULL) {
PyErr_Clear();
status = -1;
}
else
Py_DECREF(tmp);
}
return status;
}
/* Undo the effect of Py_Initialize().
Beware: if multiple interpreter and/or thread states exist, these
are not wiped out; only the current thread and interpreter state
are deleted. But since everything else is deleted, those other
interpreter and thread states should no longer be used.
(XXX We should do better, e.g. wipe out all interpreters and
threads.)
Locking: as above.
*/
int
Py_FinalizeEx(void)
{
PyInterpreterState *interp;
PyThreadState *tstate;
int status = 0;
if (!_Py_Initialized)
return status;
wait_for_thread_shutdown();
/* The interpreter is still entirely intact at this point, and the
* exit funcs may be relying on that. In particular, if some thread
* or exit func is still waiting to do an import, the import machinery
* expects Py_IsInitialized() to return true. So don't say the
* interpreter is uninitialized until after the exit funcs have run.
* Note that Threading.py uses an exit func to do a join on all the
* threads created thru it, so this also protects pending imports in
* the threads created via Threading.
*/
call_py_exitfuncs();
/* Get current thread state and interpreter pointer */
tstate = PyThreadState_GET();
interp = tstate->interp;
/* Remaining threads (e.g. daemon threads) will automatically exit
after taking the GIL (in PyEval_RestoreThread()). */
_Py_Finalizing = tstate;
_Py_Initialized = 0;
_Py_CoreInitialized = 0;
/* Flush sys.stdout and sys.stderr */
if (flush_std_files() < 0) {
status = -1;
}
/* Disable signal handling */
PyOS_FiniInterrupts();
/* Collect garbage. This may call finalizers; it's nice to call these
* before all modules are destroyed.
* XXX If a __del__ or weakref callback is triggered here, and tries to
* XXX import a module, bad things can happen, because Python no
* XXX longer believes it's initialized.
* XXX Fatal Python error: Interpreter not initialized (version mismatch?)
* XXX is easy to provoke that way. I've also seen, e.g.,
* XXX Exception exceptions.ImportError: 'No module named sha'
* XXX in <function callback at 0x008F5718> ignored
* XXX but I'm unclear on exactly how that one happens. In any case,
* XXX I haven't seen a real-life report of either of these.
*/
_PyGC_CollectIfEnabled();
#ifdef COUNT_ALLOCS
/* With COUNT_ALLOCS, it helps to run GC multiple times:
each collection might release some types from the type
list, so they become garbage. */
while (_PyGC_CollectIfEnabled() > 0)
/* nothing */;
#endif
/* Destroy all modules */
PyImport_Cleanup();
/* Flush sys.stdout and sys.stderr (again, in case more was printed) */
if (flush_std_files() < 0) {
status = -1;
}
/* Collect final garbage. This disposes of cycles created by
* class definitions, for example.
* XXX This is disabled because it caused too many problems. If
* XXX a __del__ or weakref callback triggers here, Python code has
* XXX a hard time running, because even the sys module has been
* XXX cleared out (sys.stdout is gone, sys.excepthook is gone, etc).
* XXX One symptom is a sequence of information-free messages
* XXX coming from threads (if a __del__ or callback is invoked,
* XXX other threads can execute too, and any exception they encounter
* XXX triggers a comedy of errors as subsystem after subsystem
* XXX fails to find what it *expects* to find in sys to help report
* XXX the exception and consequent unexpected failures). I've also
* XXX seen segfaults then, after adding print statements to the
* XXX Python code getting called.
*/
#if 0
_PyGC_CollectIfEnabled();
#endif
/* Disable tracemalloc after all Python objects have been destroyed,
so it is possible to use tracemalloc in objects destructor. */
_PyTraceMalloc_Fini();
/* Destroy the database used by _PyImport_{Fixup,Find}Extension */
_PyImport_Fini();
/* Cleanup typeobject.c's internal caches. */
_PyType_Fini();
/* unload faulthandler module */
_PyFaulthandler_Fini();
/* Debugging stuff */
#ifdef COUNT_ALLOCS
dump_counts(stderr);
#endif
/* dump hash stats */
_PyHash_Fini();
_PY_DEBUG_PRINT_TOTAL_REFS();
#ifdef Py_TRACE_REFS
/* Display all objects still alive -- this can invoke arbitrary
* __repr__ overrides, so requires a mostly-intact interpreter.
* Alas, a lot of stuff may still be alive now that will be cleaned
* up later.
*/
if (Py_GETENV("PYTHONDUMPREFS"))
_Py_PrintReferences(stderr);
#endif /* Py_TRACE_REFS */
/* Clear interpreter state and all thread states. */
PyInterpreterState_Clear(interp);
/* Now we decref the exception classes. After this point nothing
can raise an exception. That's okay, because each Fini() method
below has been checked to make sure no exceptions are ever
raised.
*/
_PyExc_Fini();
/* Sundry finalizers */
PyMethod_Fini();
PyFrame_Fini();
PyCFunction_Fini();
PyTuple_Fini();
PyList_Fini();
PySet_Fini();
PyBytes_Fini();
PyByteArray_Fini();
PyLong_Fini();
PyFloat_Fini();
PyDict_Fini();
PySlice_Fini();
_PyGC_Fini();
_Py_HashRandomization_Fini();
_PyArg_Fini();
PyAsyncGen_Fini();
/* Cleanup Unicode implementation */
_PyUnicode_Fini();
/* reset file system default encoding */
if (!Py_HasFileSystemDefaultEncoding && Py_FileSystemDefaultEncoding) {
PyMem_RawFree((char*)Py_FileSystemDefaultEncoding);
Py_FileSystemDefaultEncoding = NULL;
}
/* XXX Still allocated:
- various static ad-hoc pointers to interned strings
- int and float free list blocks
- whatever various modules and libraries allocate
*/
PyGrammar_RemoveAccelerators(&_PyParser_Grammar);
/* Cleanup auto-thread-state */
#ifdef WITH_THREAD
_PyGILState_Fini();
#endif /* WITH_THREAD */
/* Delete current thread. After this, many C API calls become crashy. */
PyThreadState_Swap(NULL);
PyInterpreterState_Delete(interp);
#ifdef Py_TRACE_REFS
/* Display addresses (& refcnts) of all objects still alive.
* An address can be used to find the repr of the object, printed
* above by _Py_PrintReferences.
*/
if (Py_GETENV("PYTHONDUMPREFS"))
_Py_PrintReferenceAddresses(stderr);
#endif /* Py_TRACE_REFS */
#ifdef WITH_PYMALLOC
if (_PyMem_PymallocEnabled()) {
char *opt = Py_GETENV("PYTHONMALLOCSTATS");
if (opt != NULL && *opt != '\0')
_PyObject_DebugMallocStats(stderr);
}
#endif
call_ll_exitfuncs();
return status;
}
void
Py_Finalize(void)
{
Py_FinalizeEx();
}
/* Create and initialize a new interpreter and thread, and return the
new thread. This requires that Py_Initialize() has been called
first.
Unsuccessful initialization yields a NULL pointer. Note that *no*
exception information is available even in this case -- the
exception information is held in the thread, and there is no
thread.
Locking: as above.
*/
PyThreadState *
Py_NewInterpreter(void)
{
PyInterpreterState *interp;
PyThreadState *tstate, *save_tstate;
PyObject *bimod, *sysmod;
if (!_Py_Initialized)
Py_FatalError("Py_NewInterpreter: call Py_Initialize first");
#ifdef WITH_THREAD
/* Issue #10915, #15751: The GIL API doesn't work with multiple
interpreters: disable PyGILState_Check(). */
_PyGILState_check_enabled = 0;
#endif
interp = PyInterpreterState_New();
if (interp == NULL)
return NULL;
tstate = PyThreadState_New(interp);
if (tstate == NULL) {
PyInterpreterState_Delete(interp);
return NULL;
}
save_tstate = PyThreadState_Swap(tstate);
/* Copy the current interpreter config into the new interpreter */
if (save_tstate != NULL) {
interp->core_config = save_tstate->interp->core_config;
interp->config = save_tstate->interp->config;
} else {
/* No current thread state, copy from the main interpreter */
PyInterpreterState *main_interp = PyInterpreterState_Main();
interp->core_config = main_interp->core_config;
interp->config = main_interp->config;
}
/* XXX The following is lax in error checking */
interp->modules = PyDict_New();
bimod = _PyImport_FindBuiltin("builtins");
if (bimod != NULL) {
interp->builtins = PyModule_GetDict(bimod);