/* 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 "compile.h"

#include "symtable.h"

#include "pyarena.h"

#include "ast.h"

#include "eval.h"

#include "marshal.h"

#include "abstract.h"

#ifdef HAVE_SIGNAL_H

#include <signal.h>

#endif

#ifdef MS_WINDOWS

#include "malloc.h" /* for alloca */

#endif

#ifdef HAVE_LANGINFO_H

#include <locale.h>

#include <langinfo.h>

#endif

#ifdef MS_WINDOWS

#undef BYTE

#include "windows.h"

#endif

#ifndef Py_REF_DEBUG

#define PRINT_TOTAL_REFS()

#else /* Py_REF_DEBUG */

#define PRINT_TOTAL_REFS() fprintf(stderr, \

"[%" PY_FORMAT_SIZE_T "d refs]\n", \

_Py_GetRefTotal())

#endif

#ifdef __cplusplus

extern "C" {

#endif

extern char *Py_GetPath(void);

extern grammar _PyParser_Grammar; /* From graminit.c */

/* Forward */

static void initmain(void);

static void initsite(void);

static PyObject *run_mod(mod_ty, const char *, PyObject *, PyObject *,

PyCompilerFlags *, PyArena *);

static PyObject *run_pyc_file(FILE *, const char *, PyObject *, PyObject *,

PyCompilerFlags *);

static void err_input(perrdetail *);

static void initsigs(void);

static void wait_for_thread_shutdown(void);

static void call_sys_exitfunc(void);

static void call_ll_exitfuncs(void);

extern void _PyUnicode_Init(void);

extern void _PyUnicode_Fini(void);

extern void _PyRandom_Init(void);

#ifdef WITH_THREAD

extern void _PyGILState_Init(PyInterpreterState *, PyThreadState *);

extern void _PyGILState_Fini(void);

#endif /* WITH_THREAD */

int Py_DebugFlag; /* Needed by parser.c */

int Py_VerboseFlag; /* Needed by import.c */

int Py_InteractiveFlag; /* Needed by Py_FdIsInteractive() below */

int Py_InspectFlag; /* Needed to determine whether to exit at SystemExit */

int Py_NoSiteFlag; /* Suppress 'import site' */

int Py_BytesWarningFlag; /* Warn on str(bytes) and str(buffer) */

int Py_DontWriteBytecodeFlag; /* Suppress writing bytecode files (*.py[co]) */

int Py_UseClassExceptionsFlag = 1; /* Needed by bltinmodule.c: deprecated */

int Py_FrozenFlag; /* Needed by getpath.c */

int Py_UnicodeFlag = 0; /* Needed by compile.c */

int Py_IgnoreEnvironmentFlag; /* e.g. PYTHONPATH, PYTHONHOME */

/* _XXX Py_QnewFlag should go away in 2.3. It's true iff -Qnew is passed,

on the command line, and is used in 2.2 by ceval.c to make all "/" divisions

true divisions (which they will be in 2.3). */

int _Py_QnewFlag = 0;

int Py_NoUserSiteDirectory = 0; /* for -s and site.py */

int Py_HashRandomizationFlag = 0; /* for -R and PYTHONHASHSEED */

/* 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");

}

static int initialized = 0;

/* API to access the initialized flag -- useful for esoteric use */

int

Py_IsInitialized(void)

{

return initialized;

}

/* Global initializations. Can be undone by Py_Finalize(). Don't

call this twice without an intervening Py_Finalize() 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;

}

void

Py_InitializeEx(int install_sigs)

{

PyInterpreterState *interp;

PyThreadState *tstate;

PyObject *bimod, *sysmod;

char *p;

char *icodeset = NULL; /* On Windows, input codeset may theoretically

differ from output codeset. */

char *codeset = NULL;

char *errors = NULL;

int free_codeset = 0;

int overridden = 0;

PyObject *sys_stream, *sys_isatty;

#if defined(Py_USING_UNICODE) && defined(HAVE_LANGINFO_H) && defined(CODESET)

char *saved_locale, *loc_codeset;

#endif

#ifdef MS_WINDOWS

char ibuf[128];

char buf[128];

#endif

extern void _Py_ReadyTypes(void);

if (initialized)

return;

initialized = 1;

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; _PyRandom_Init will

check its value further. */

if ((p = Py_GETENV("PYTHONHASHSEED")) && *p != '\0')

Py_HashRandomizationFlag = add_flag(Py_HashRandomizationFlag, p);

_PyRandom_Init();

interp = PyInterpreterState_New();

if (interp == NULL)

Py_FatalError("Py_Initialize: can't make first interpreter");

tstate = PyThreadState_New(interp);

if (tstate == NULL)

Py_FatalError("Py_Initialize: can't make first thread");

(void) PyThreadState_Swap(tstate);

_Py_ReadyTypes();

if (!_PyFrame_Init())

Py_FatalError("Py_Initialize: can't init frames");

if (!_PyInt_Init())

Py_FatalError("Py_Initialize: can't init ints");

if (!_PyLong_Init())

Py_FatalError("Py_Initialize: can't init longs");

if (!PyByteArray_Init())

Py_FatalError("Py_Initialize: can't init bytearray");

_PyFloat_Init();

interp->modules = PyDict_New();

if (interp->modules == NULL)

Py_FatalError("Py_Initialize: can't make modules dictionary");

interp->modules_reloading = PyDict_New();

if (interp->modules_reloading == NULL)

Py_FatalError("Py_Initialize: can't make modules_reloading dictionary");

#ifdef Py_USING_UNICODE

/* Init Unicode implementation; relies on the codec registry */

_PyUnicode_Init();

#endif

bimod = _PyBuiltin_Init();

if (bimod == NULL)

Py_FatalError("Py_Initialize: can't initialize __builtin__");

interp->builtins = PyModule_GetDict(bimod);

if (interp->builtins == NULL)

Py_FatalError("Py_Initialize: can't initialize builtins dict");

Py_INCREF(interp->builtins);

sysmod = _PySys_Init();

if (sysmod == NULL)

Py_FatalError("Py_Initialize: can't initialize sys");

interp->sysdict = PyModule_GetDict(sysmod);

if (interp->sysdict == NULL)

Py_FatalError("Py_Initialize: can't initialize sys dict");

Py_INCREF(interp->sysdict);

_PyImport_FixupExtension("sys", "sys");

PySys_SetPath(Py_GetPath());

PyDict_SetItemString(interp->sysdict, "modules",

interp->modules);

_PyImport_Init();

/* initialize builtin exceptions */

_PyExc_Init();

_PyImport_FixupExtension("exceptions", "exceptions");

/* phase 2 of builtins */

_PyImport_FixupExtension("__builtin__", "__builtin__");

_PyImportHooks_Init();

if (install_sigs)

initsigs(); /* Signal handling stuff, including initintr() */

/* Initialize warnings. */

_PyWarnings_Init();

if (PySys_HasWarnOptions()) {

PyObject *warnings_module = PyImport_ImportModule("warnings");

if (!warnings_module)

PyErr_Clear();

Py_XDECREF(warnings_module);

}

initmain(); /* Module __main__ */

/* auto-thread-state API, if available */

#ifdef WITH_THREAD

_PyGILState_Init(interp, tstate);

#endif /* WITH_THREAD */

if (!Py_NoSiteFlag)

initsite(); /* Module site */

if ((p = Py_GETENV("PYTHONIOENCODING")) && *p != '\0') {

p = icodeset = codeset = strdup(p);

free_codeset = 1;

errors = strchr(p, ':');

if (errors) {

*errors = '\0';

errors++;

}

overridden = 1;

}

#if defined(Py_USING_UNICODE) && defined(HAVE_LANGINFO_H) && defined(CODESET)

/* On Unix, set the file system encoding according to the

user's preference, if the CODESET names a well-known

Python codec, and Py_FileSystemDefaultEncoding isn't

initialized by other means. Also set the encoding of

stdin and stdout if these are terminals, unless overridden. */

if (!overridden || !Py_FileSystemDefaultEncoding) {

saved_locale = strdup(setlocale(LC_CTYPE, NULL));

setlocale(LC_CTYPE, "");

loc_codeset = nl_langinfo(CODESET);

if (loc_codeset && *loc_codeset) {

PyObject *enc = PyCodec_Encoder(loc_codeset);

if (enc) {

loc_codeset = strdup(loc_codeset);

Py_DECREF(enc);

} else {

if (PyErr_ExceptionMatches(PyExc_LookupError)) {

PyErr_Clear();

loc_codeset = NULL;

} else {

PyErr_Print();

exit(1);

}

}

} else

loc_codeset = NULL;

setlocale(LC_CTYPE, saved_locale);

free(saved_locale);

if (!overridden) {

codeset = icodeset = loc_codeset;

free_codeset = 1;

}

/* Initialize Py_FileSystemDefaultEncoding from

locale even if PYTHONIOENCODING is set. */

if (!Py_FileSystemDefaultEncoding) {

Py_FileSystemDefaultEncoding = loc_codeset;

if (!overridden)

free_codeset = 0;

}

}

#endif

#ifdef MS_WINDOWS

if (!overridden) {

icodeset = ibuf;

codeset = buf;

sprintf(ibuf, "cp%d", GetConsoleCP());

sprintf(buf, "cp%d", GetConsoleOutputCP());

}

#endif

if (codeset) {

sys_stream = PySys_GetObject("stdin");

sys_isatty = PyObject_CallMethod(sys_stream, "isatty", "");

if (!sys_isatty)

PyErr_Clear();

if ((overridden ||

(sys_isatty && PyObject_IsTrue(sys_isatty))) &&

PyFile_Check(sys_stream)) {

if (!PyFile_SetEncodingAndErrors(sys_stream, icodeset, errors))

Py_FatalError("Cannot set codeset of stdin");

}

Py_XDECREF(sys_isatty);

sys_stream = PySys_GetObject("stdout");

sys_isatty = PyObject_CallMethod(sys_stream, "isatty", "");

if (!sys_isatty)

PyErr_Clear();

if ((overridden ||

(sys_isatty && PyObject_IsTrue(sys_isatty))) &&

PyFile_Check(sys_stream)) {

if (!PyFile_SetEncodingAndErrors(sys_stream, codeset, errors))

Py_FatalError("Cannot set codeset of stdout");

}

Py_XDECREF(sys_isatty);

sys_stream = PySys_GetObject("stderr");

sys_isatty = PyObject_CallMethod(sys_stream, "isatty", "");

if (!sys_isatty)

PyErr_Clear();

if((overridden ||

(sys_isatty && PyObject_IsTrue(sys_isatty))) &&

PyFile_Check(sys_stream)) {

if (!PyFile_SetEncodingAndErrors(sys_stream, codeset, errors))

Py_FatalError("Cannot set codeset of stderr");

}

Py_XDECREF(sys_isatty);

if (free_codeset)

free(codeset);

}

}

void

Py_Initialize(void)

{

Py_InitializeEx(1);

}

#ifdef COUNT_ALLOCS

extern void dump_counts(FILE*);

#endif

/* 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.

*/

void

Py_Finalize(void)

{

PyInterpreterState *interp;

PyThreadState *tstate;

if (!initialized)

return;

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_sys_exitfunc();

initialized = 0;

/* Get current thread state and interpreter pointer */

tstate = PyThreadState_GET();

interp = tstate->interp;

/* Disable signal handling */

PyOS_FiniInterrupts();

/* Clear type lookup cache */

PyType_ClearCache();

/* 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_Collect();

#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_Collect() > 0)

/* nothing */;

#endif

/* Destroy all modules */

PyImport_Cleanup();

/* Collect final garbage. This disposes of cycles created by

* new-style 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_Collect();

#endif

/* Destroy the database used by _PyImport_{Fixup,Find}Extension */

_PyImport_Fini();

/* Debugging stuff */

#ifdef COUNT_ALLOCS

dump_counts(stdout);

#endif

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 */

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();

/* Cleanup auto-thread-state */

#ifdef WITH_THREAD

_PyGILState_Fini();

#endif /* WITH_THREAD */

/* Delete current thread */

PyThreadState_Swap(NULL);

PyInterpreterState_Delete(interp);

/* Sundry finalizers */

PyMethod_Fini();

PyFrame_Fini();

PyCFunction_Fini();

PyTuple_Fini();

PyList_Fini();

PySet_Fini();

PyString_Fini();

PyByteArray_Fini();

PyInt_Fini();

PyFloat_Fini();

PyDict_Fini();

#ifdef Py_USING_UNICODE

/* Cleanup Unicode implementation */

_PyUnicode_Fini();

#endif

/* 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);

#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 PYMALLOC_DEBUG

if (Py_GETENV("PYTHONMALLOCSTATS"))

_PyObject_DebugMallocStats();

#endif

call_ll_exitfuncs();

}

/* 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 (!initialized)

Py_FatalError("Py_NewInterpreter: call Py_Initialize first");

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);

/* XXX The following is lax in error checking */

interp->modules = PyDict_New();

interp->modules_reloading = PyDict_New();

bimod = _PyImport_FindExtension("__builtin__", "__builtin__");

if (bimod != NULL) {

interp->builtins = PyModule_GetDict(bimod);

if (interp->builtins == NULL)

goto handle_error;

Py_INCREF(interp->builtins);

}

sysmod = _PyImport_FindExtension("sys", "sys");

if (bimod != NULL && sysmod != NULL) {

interp->sysdict = PyModule_GetDict(sysmod);

if (interp->sysdict == NULL)

goto handle_error;

Py_INCREF(interp->sysdict);

PySys_SetPath(Py_GetPath());

PyDict_SetItemString(interp->sysdict, "modules",

interp->modules);

_PyImportHooks_Init();

initmain();

if (!Py_NoSiteFlag)

initsite();

}

if (!PyErr_Occurred())

return tstate;

handle_error:

/* Oops, it didn't work. Undo it all. */

PyErr_Print();

PyThreadState_Clear(tstate);

PyThreadState_Swap(save_tstate);

PyThreadState_Delete(tstate);

PyInterpreterState_Delete(interp);

return NULL;

}

/* Delete an interpreter and its last thread. This requires that the

given thread state is current, that the thread has no remaining

frames, and that it is its interpreter's only remaining thread.

It is a fatal error to violate these constraints.

(Py_Finalize() doesn't have these constraints -- it zaps

everything, regardless.)

Locking: as above.

*/

void

Py_EndInterpreter(PyThreadState *tstate)

{

PyInterpreterState *interp = tstate->interp;

if (tstate != PyThreadState_GET())

Py_FatalError("Py_EndInterpreter: thread is not current");

if (tstate->frame != NULL)

Py_FatalError("Py_EndInterpreter: thread still has a frame");

if (tstate != interp->tstate_head || tstate->next != NULL)

Py_FatalError("Py_EndInterpreter: not the last thread");

PyImport_Cleanup();

PyInterpreterState_Clear(interp);

PyThreadState_Swap(NULL);

PyInterpreterState_Delete(interp);

}

static char *progname = "python";

void

Py_SetProgramName(char *pn)

{

if (pn && *pn)

progname = pn;

}

char *

Py_GetProgramName(void)

{

return progname;

}

static char *default_home = NULL;

void

Py_SetPythonHome(char *home)

{

default_home = home;

}

char *

Py_GetPythonHome(void)

{

char *home = default_home;

if (home == NULL && !Py_IgnoreEnvironmentFlag)

home = Py_GETENV("PYTHONHOME");

return home;

}

/* Create __main__ module */

static void

initmain(void)

{

PyObject *m, *d;

m = PyImport_AddModule("__main__");

if (m == NULL)

Py_FatalError("can't create __main__ module");

d = PyModule_GetDict(m);

if (PyDict_GetItemString(d, "__builtins__") == NULL) {

PyObject *bimod = PyImport_ImportModule("__builtin__");

if (bimod == NULL ||

PyDict_SetItemString(d, "__builtins__", bimod) != 0)

Py_FatalError("can't add __builtins__ to __main__");

Py_XDECREF(bimod);

}

}

/* Import the site module (not into __main__ though) */

static void

initsite(void)

{

PyObject *m;

m = PyImport_ImportModule("site");

if (m == NULL) {

PyErr_Print();

Py_Finalize();

exit(1);

}

else {

Py_DECREF(m);

}

}

/* Parse input from a file and execute it */

int

PyRun_AnyFileExFlags(FILE *fp, const char *filename, int closeit,

PyCompilerFlags *flags)

{

if (filename == NULL)

filename = "???";

if (Py_FdIsInteractive(fp, filename)) {

int err = PyRun_InteractiveLoopFlags(fp, filename, flags);

if (closeit)

fclose(fp);

return err;

}

else

return PyRun_SimpleFileExFlags(fp, filename, closeit, flags);

}

int

PyRun_InteractiveLoopFlags(FILE *fp, const char *filename, PyCompilerFlags *flags)

{

PyObject *v;

int ret;

PyCompilerFlags local_flags;

if (flags == NULL) {

flags = &local_flags;

local_flags.cf_flags = 0;

}

v = PySys_GetObject("ps1");

if (v == NULL) {

PySys_SetObject("ps1", v = PyString_FromString(">>> "));

Py_XDECREF(v);

}

v = PySys_GetObject("ps2");

if (v == NULL) {

PySys_SetObject("ps2", v = PyString_FromString("... "));

Py_XDECREF(v);

}

for (;;) {

ret = PyRun_InteractiveOneFlags(fp, filename, flags);

PRINT_TOTAL_REFS();

if (ret == E_EOF)

return 0;

/*

if (ret == E_NOMEM)

return -1;

*/

}

}

#if 0

/* compute parser flags based on compiler flags */

#define PARSER_FLAGS(flags) \

((flags) ? ((((flags)->cf_flags & PyCF_DONT_IMPLY_DEDENT) ? \

PyPARSE_DONT_IMPLY_DEDENT : 0)) : 0)

#endif

#if 1

/* Keep an example of flags with future keyword support. */

#define PARSER_FLAGS(flags) \

((flags) ? ((((flags)->cf_flags & PyCF_DONT_IMPLY_DEDENT) ? \

PyPARSE_DONT_IMPLY_DEDENT : 0) \

| (((flags)->cf_flags & CO_FUTURE_PRINT_FUNCTION) ? \

PyPARSE_PRINT_IS_FUNCTION : 0) \

| (((flags)->cf_flags & CO_FUTURE_UNICODE_LITERALS) ? \

PyPARSE_UNICODE_LITERALS : 0) \

) : 0)

#endif

int

PyRun_InteractiveOneFlags(FILE *fp, const char *filename, PyCompilerFlags *flags)

{

PyObject *m, *d, *v, *w;

mod_ty mod;

PyArena *arena;

char *ps1 = "", *ps2 = "";

int errcode = 0;

v = PySys_GetObject("ps1");

if (v != NULL) {

v = PyObject_Str(v);

if (v == NULL)

PyErr_Clear();

else if (PyString_Check(v))

ps1 = PyString_AsString(v);

}

w = PySys_GetObject("ps2");

if (w != NULL) {

w = PyObject_Str(w);

if (w == NULL)

PyErr_Clear();

else if (PyString_Check(w))

ps2 = PyString_AsString(w);

}

arena = PyArena_New();

if (arena == NULL) {

Py_XDECREF(v);

Py_XDECREF(w);

return -1;

}

mod = PyParser_ASTFromFile(fp, filename,

Py_single_input, ps1, ps2,

flags, &errcode, arena);

Py_XDECREF(v);

Py_XDECREF(w);

if (mod == NULL) {

PyArena_Free(arena);

if (errcode == E_EOF) {

PyErr_Clear();

return E_EOF;

}

PyErr_Print();

return -1;

}

m = PyImport_AddModule("__main__");

if (m == NULL) {

PyArena_Free(arena);

return -1;

}

d = PyModule_GetDict(m);

v = run_mod(mod, filename, d, d, flags, arena);

PyArena_Free(arena);

if (v == NULL) {

PyErr_Print();

return -1;

}

Py_DECREF(v);

if (Py_FlushLine())

PyErr_Clear();

return 0;

}

/* Check whether a file maybe a pyc file: Look at the extension,

the file type, and, if we may close it, at the first few bytes. */

static int

maybe_pyc_file(FILE *fp, const char* filename, const char* ext, int closeit)

{

if (strcmp(ext, ".pyc") == 0 || strcmp(ext, ".pyo") == 0)

return 1;

/* Only look into the file if we are allowed to close it, since

it then should also be seekable. */

if (closeit) {

/* Read only two bytes of the magic. If the file was opened in

text mode, the bytes 3 and 4 of the magic (\r\n) might not

be read as they are on disk. */

unsigned int halfmagic = PyImport_GetMagicNumber() & 0xFFFF;

unsigned char buf[2];

/* Mess: In case of -x, the stream is NOT at its start now,

and ungetc() was used to push back the first newline,

which makes the current stream position formally undefined,

and a x-platform nightmare.

Unfortunately, we have no direct way to know whether -x

was specified. So we use a terrible hack: if the current

stream position is not 0, we assume -x was specified, and

give up. Bug 132850 on SourceForge spells out the

hopelessness of trying anything else (fseek and ftell

don't work predictably x-platform for text-mode files).

*/

int ispyc = 0;

if (ftell(fp) == 0) {

if (fread(buf, 1, 2, fp) == 2 &&

((unsigned int)buf[1]<<8 | buf[0]) == halfmagic)

ispyc = 1;

rewind(fp);

}

return ispyc;

}

return 0;

}

int

PyRun_SimpleFileExFlags(FILE *fp, const char *filename, int closeit,

PyCompilerFlags *flags)

{

PyObject *m, *d, *v;

const char *ext;

int set_file_name = 0, ret, len;

m = PyImport_AddModule("__main__");

if (m == NULL)

return -1;

d = PyModule_GetDict(m);

if (PyDict_GetItemString(d, "__file__") == NULL) {

PyObject *f = PyString_FromString(filename);

if (f == NULL)

return -1;

if (PyDict_SetItemString(d, "__file__", f) < 0) {

Py_DECREF(f);

return -1;

}

set_file_name = 1;

Py_DECREF(f);

}

len = strlen(filename);

ext = filename + len - (len > 4 ? 4 : 0);

if (maybe_pyc_file(fp, filename, ext, closeit)) {

/* Try to run a pyc file. First, re-open in binary */

if (closeit)

fclose(fp);

if ((fp = fopen(filename, "rb")) == NULL) {

fprintf(stderr, "python: Can't reopen .pyc file\n");

ret = -1;

goto done;

}

/* Turn on optimization if a .pyo file is given */

if (strcmp(ext, ".pyo") == 0)

Py_OptimizeFlag = 1;

v = run_pyc_file(fp, filename, d, d, flags);

} else {

v = PyRun_FileExFlags(fp, filename, Py_file_input, d, d,

closeit, flags);

}

if (v == NULL) {

PyErr_Print();

ret = -1;

goto done;

}

Py_DECREF(v);

if (Py_FlushLine())

PyErr_Clear();

ret = 0;

done:

if (set_file_name && PyDict_DelItemString(d, "__file__"))

PyErr_Clear();

return ret;

}

int

PyRun_SimpleStringFlags(const char *command, PyCompilerFlags *flags)

{

PyObject *m, *d, *v;

m = PyImport_AddModule("__main__");

if (m == NULL)

return -1;

d = PyModule_GetDict(m);

v = PyRun_StringFlags(command, Py_file_input, d, d, flags);

if (v == NULL) {

PyErr_Print();

return -1;

}

Py_DECREF(v);

if (Py_FlushLine())

PyErr_Clear();

return 0;

}

static int

parse_syntax_error(PyObject *err, PyObject **message, const char **filename,

int *lineno, int *offset, const char **text)

{

long hold;

PyObject *v;

/* old style errors */

if (PyTuple_Check(err))

return PyArg_ParseTuple(err, "O(ziiz)", message, filename,

lineno, offset, text);

/* new style errors. `err' is an instance */

if (! (v = PyObject_GetAttrString(err, "msg")))

goto finally;

*message = v;

if (!(v = PyObject_GetAttrString(err, "filename")))

goto finally;