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cpython/Python/pythonrun.c

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/* Python interpreter top-level routines, including init/exit */
#include "Python.h"
#include "Python-ast.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 <signal.h>
#ifdef HAVE_LANGINFO_H
#include <locale.h>
#include <langinfo.h>
#endif
#ifdef MS_WINDOWS
#undef BYTE
#include "windows.h"
#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_err_mod(mod_ty, const char *, PyObject *, PyObject *,
PyCompilerFlags *, PyArena *arena);
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 call_sys_exitfunc(void);
static void call_ll_exitfuncs(void);
extern void _PyUnicode_Init(void);
extern void _PyUnicode_Fini(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_NoSiteFlag; /* Suppress 'import site' */
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;
/* Reference to 'warnings' module, to avoid importing it
on the fly when the import lock may be held. See 683658/771097
*/
static PyObject *warnings_module = NULL;
/* Returns a borrowed reference to the 'warnings' module, or NULL.
If the module is returned, it is guaranteed to have been obtained
without acquiring the import lock
*/
PyObject *PyModule_GetWarningsModule(void)
{
PyObject *typ, *val, *tb;
PyObject *all_modules;
/* If we managed to get the module at init time, just use it */
if (warnings_module)
return warnings_module;
/* If it wasn't available at init time, it may be available
now in sys.modules (common scenario is frozen apps: import
at init time fails, but the frozen init code sets up sys.path
correctly, then does an implicit import of warnings for us
*/
/* Save and restore any exceptions */
PyErr_Fetch(&typ, &val, &tb);
all_modules = PySys_GetObject("modules");
if (all_modules) {
warnings_module = PyDict_GetItemString(all_modules, "warnings");
/* We keep a ref in the global */
Py_XINCREF(warnings_module);
}
PyErr_Restore(typ, val, tb);
return warnings_module;
}
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;
#if defined(Py_USING_UNICODE) && defined(HAVE_LANGINFO_H) && defined(CODESET)
char *codeset;
char *saved_locale;
PyObject *sys_stream, *sys_isatty;
#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);
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");
_PyFloat_Init();
interp->modules = PyDict_New();
if (interp->modules == NULL)
Py_FatalError("Py_Initialize: can't make modules 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);
Py_INCREF(interp->builtins);
sysmod = _PySys_Init();
if (sysmod == NULL)
Py_FatalError("Py_Initialize: can't initialize sys");
interp->sysdict = PyModule_GetDict(sysmod);
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() */
initmain(); /* Module __main__ */
if (!Py_NoSiteFlag)
initsite(); /* Module site */
/* auto-thread-state API, if available */
#ifdef WITH_THREAD
_PyGILState_Init(interp, tstate);
#endif /* WITH_THREAD */
warnings_module = PyImport_ImportModule("warnings");
if (!warnings_module)
PyErr_Clear();
#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. */
saved_locale = strdup(setlocale(LC_CTYPE, NULL));
setlocale(LC_CTYPE, "");
codeset = nl_langinfo(CODESET);
if (codeset && *codeset) {
PyObject *enc = PyCodec_Encoder(codeset);
if (enc) {
codeset = strdup(codeset);
Py_DECREF(enc);
} else {
codeset = NULL;
PyErr_Clear();
}
} else
codeset = NULL;
setlocale(LC_CTYPE, saved_locale);
free(saved_locale);
if (codeset) {
sys_stream = PySys_GetObject("stdin");
sys_isatty = PyObject_CallMethod(sys_stream, "isatty", "");
if (!sys_isatty)
PyErr_Clear();
if(sys_isatty && PyObject_IsTrue(sys_isatty)) {
if (!PyFile_SetEncoding(sys_stream, codeset))
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(sys_isatty && PyObject_IsTrue(sys_isatty)) {
if (!PyFile_SetEncoding(sys_stream, codeset))
Py_FatalError("Cannot set codeset of stdout");
}
Py_XDECREF(sys_isatty);
if (!Py_FileSystemDefaultEncoding)
Py_FileSystemDefaultEncoding = codeset;
else
free(codeset);
}
#endif
}
void
Py_Initialize(void)
{
Py_InitializeEx(1);
}
#ifdef COUNT_ALLOCS
extern void dump_counts(void);
#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;
/* 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();
/* drop module references we saved */
Py_XDECREF(warnings_module);
warnings_module = NULL;
/* 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();
/* 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();
#endif
#ifdef Py_REF_DEBUG
fprintf(stderr, "[%ld refs]\n", _Py_RefTotal);
#endif
#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 */
/* Cleanup auto-thread-state */
#ifdef WITH_THREAD
_PyGILState_Fini();
#endif /* WITH_THREAD */
/* 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();
/* 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();
PyInt_Fini();
PyFloat_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();
bimod = _PyImport_FindExtension("__builtin__", "__builtin__");
if (bimod != NULL) {
interp->builtins = PyModule_GetDict(bimod);
Py_INCREF(interp->builtins);
}
sysmod = _PyImport_FindExtension("sys", "sys");
if (bimod != NULL && sysmod != NULL) {
interp->sysdict = PyModule_GetDict(sysmod);
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;
/* 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_DECREF(bimod);
}
}
/* Import the site module (not into __main__ though) */
static void
initsite(void)
{
PyObject *m, *f;
m = PyImport_ImportModule("site");
if (m == NULL) {
f = PySys_GetObject("stderr");
if (Py_VerboseFlag) {
PyFile_WriteString(
"'import site' failed; traceback:\n", f);
PyErr_Print();
}
else {
PyFile_WriteString(
"'import site' failed; use -v for traceback\n", f);
PyErr_Clear();
}
}
else {
Py_DECREF(m);
}
}
/* Parse input from a file and execute it */
int
PyRun_AnyFileExFlags(FILE *fp, 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);
#ifdef Py_REF_DEBUG
fprintf(stderr, "[%ld refs]\n", _Py_RefTotal);
#endif
if (ret == E_EOF)
return 0;
/*
if (ret == E_NOMEM)
return -1;
*/
}
}
/* compute parser flags based on compiler flags */
#define PARSER_FLAGS(flags) \
(((flags) && (flags)->cf_flags & PyCF_DONT_IMPLY_DEDENT) ? \
PyPARSE_DONT_IMPLY_DEDENT : 0)
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();
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;
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;
}
Py_DECREF(f);
}
ext = filename + strlen(filename) - 4;
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");
return -1;
}
/* 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();
return -1;
}
Py_DECREF(v);
if (Py_FlushLine())
PyErr_Clear();
return 0;
}
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;
if (v == Py_None)
*filename = NULL;
else if (! (*filename = PyString_AsString(v)))
goto finally;
Py_DECREF(v);
if (!(v = PyObject_GetAttrString(err, "lineno")))
goto finally;
hold = PyInt_AsLong(v);
Py_DECREF(v);
v = NULL;
if (hold < 0 && PyErr_Occurred())
goto finally;
*lineno = (int)hold;
if (!(v = PyObject_GetAttrString(err, "offset")))
goto finally;
if (v == Py_None) {
*offset = -1;
Py_DECREF(v);
v = NULL;
} else {
hold = PyInt_AsLong(v);
Py_DECREF(v);
v = NULL;
if (hold < 0 && PyErr_Occurred())
goto finally;
*offset = (int)hold;
}
if (!(v = PyObject_GetAttrString(err, "text")))
goto finally;
if (v == Py_None)
*text = NULL;
else if (! (*text = PyString_AsString(v)))
goto finally;
Py_DECREF(v);
return 1;
finally:
Py_XDECREF(v);
return 0;
}
void
PyErr_Print(void)
{
PyErr_PrintEx(1);
}
static void
print_error_text(PyObject *f, int offset, const char *text)
{
char *nl;
if (offset >= 0) {
if (offset > 0 && offset == (int)strlen(text))
offset--;
for (;;) {
nl = strchr(text, '\n');
if (nl == NULL || nl-text >= offset)
break;
offset -= (int)(nl+1-text);
text = nl+1;
}
while (*text == ' ' || *text == '\t') {
text++;
offset--;
}
}
PyFile_WriteString(" ", f);
PyFile_WriteString(text, f);
if (*text == '\0' || text[strlen(text)-1] != '\n')
PyFile_WriteString("\n", f);
if (offset == -1)
return;
PyFile_WriteString(" ", f);
offset--;
while (offset > 0) {
PyFile_WriteString(" ", f);
offset--;
}
PyFile_WriteString("^\n", f);
}
static void
handle_system_exit(void)
{
PyObject *exception, *value, *tb;
int exitcode = 0;
PyErr_Fetch(&exception, &value, &tb);
if (Py_FlushLine())
PyErr_Clear();
fflush(stdout);
if (value == NULL || value == Py_None)
goto done;
if (PyInstance_Check(value)) {
/* The error code should be in the `code' attribute. */
PyObject *code = PyObject_GetAttrString(value, "code");
if (code) {
Py_DECREF(value);
value = code;
if (value == Py_None)
goto done;
}
/* If we failed to dig out the 'code' attribute,
just let the else clause below print the error. */
}
if (PyInt_Check(value))
exitcode = (int)PyInt_AsLong(value);
else {
PyObject_Print(value, stderr, Py_PRINT_RAW);
PySys_WriteStderr("\n");
exitcode = 1;
}
done:
/* Restore and clear the exception info, in order to properly decref
* the exception, value, and traceback. If we just exit instead,
* these leak, which confuses PYTHONDUMPREFS output, and may prevent
* some finalizers from running.
*/
PyErr_Restore(exception, value, tb);
PyErr_Clear();
Py_Exit(exitcode);
/* NOTREACHED */
}
void
PyErr_PrintEx(int set_sys_last_vars)
{
PyObject *exception, *v, *tb, *hook;
if (PyErr_ExceptionMatches(PyExc_SystemExit)) {
handle_system_exit();
}
PyErr_Fetch(&exception, &v, &tb);
if (exception == NULL)
return;
PyErr_NormalizeException(&exception, &v, &tb);
if (exception == NULL)
return;
if (set_sys_last_vars) {
PySys_SetObject("last_type", exception);
PySys_SetObject("last_value", v);
PySys_SetObject("last_traceback", tb);
}
hook = PySys_GetObject("excepthook");
if (hook) {
PyObject *args = PyTuple_Pack(3,
exception, v ? v : Py_None, tb ? tb : Py_None);
PyObject *result = PyEval_CallObject(hook, args);
if (result == NULL) {
PyObject *exception2, *v2, *tb2;
if (PyErr_ExceptionMatches(PyExc_SystemExit)) {
handle_system_exit();
}
PyErr_Fetch(&exception2, &v2, &tb2);
PyErr_NormalizeException(&exception2, &v2, &tb2);
if (Py_FlushLine())
PyErr_Clear();
fflush(stdout);
PySys_WriteStderr("Error in sys.excepthook:\n");
PyErr_Display(exception2, v2, tb2);
PySys_WriteStderr("\nOriginal exception was:\n");
PyErr_Display(exception, v, tb);
Py_XDECREF(exception2);
Py_XDECREF(v2);
Py_XDECREF(tb2);
}
Py_XDECREF(result);
Py_XDECREF(args);
} else {
PySys_WriteStderr("sys.excepthook is missing\n");
PyErr_Display(exception, v, tb);
}
Py_XDECREF(exception);
Py_XDECREF(v);
Py_XDECREF(tb);
}
void PyErr_Display(PyObject *exception, PyObject *value, PyObject *tb)
{
int err = 0;
PyObject *f = PySys_GetObject("stderr");
Py_INCREF(value);
if (f == NULL)
fprintf(stderr, "lost sys.stderr\n");
else {
if (Py_FlushLine())
PyErr_Clear();
fflush(stdout);
if (tb && tb != Py_None)
err = PyTraceBack_Print(tb, f);
if (err == 0 &&
PyObject_HasAttrString(value, "print_file_and_line"))
{
PyObject *message;
const char *filename, *text;
int lineno, offset;
if (!parse_syntax_error(value, &message, &filename,
&lineno, &offset, &text))
PyErr_Clear();
else {
char buf[10];
PyFile_WriteString(" File \"", f);
if (filename == NULL)
PyFile_WriteString("<string>", f);
else
PyFile_WriteString(filename, f);
PyFile_WriteString("\", line ", f);
PyOS_snprintf(buf, sizeof(buf), "%d", lineno);
PyFile_WriteString(buf, f);
PyFile_WriteString("\n", f);
if (text != NULL)
print_error_text(f, offset, text);
Py_DECREF(value);
value = message;
/* Can't be bothered to check all those
PyFile_WriteString() calls */
if (PyErr_Occurred())
err = -1;
}
}
if (err) {
/* Don't do anything else */
}
else if (PyClass_Check(exception)) {
PyClassObject* exc = (PyClassObject*)exception;
PyObject* className = exc->cl_name;
PyObject* moduleName =
PyDict_GetItemString(exc->cl_dict, "__module__");
if (moduleName == NULL)
err = PyFile_WriteString("<unknown>", f);
else {
char* modstr = PyString_AsString(moduleName);
if (modstr && strcmp(modstr, "exceptions"))
{
err = PyFile_WriteString(modstr, f);
err += PyFile_WriteString(".", f);
}
}
if (err == 0) {
if (className == NULL)
err = PyFile_WriteString("<unknown>", f);
else
err = PyFile_WriteObject(className, f,
Py_PRINT_RAW);
}
}
else
err = PyFile_WriteObject(exception, f, Py_PRINT_RAW);
if (err == 0) {
if (value != Py_None) {
PyObject *s = PyObject_Str(value);
/* only print colon if the str() of the
object is not the empty string
*/
if (s == NULL)
err = -1;
else if (!PyString_Check(s) ||
PyString_GET_SIZE(s) != 0)
err = PyFile_WriteString(": ", f);
if (err == 0)
err = PyFile_WriteObject(s, f, Py_PRINT_RAW);
Py_XDECREF(s);
}
}
if (err == 0)
err = PyFile_WriteString("\n", f);
}
Py_DECREF(value);
/* If an error happened here, don't show it.
XXX This is wrong, but too many callers rely on this behavior. */
if (err != 0)
PyErr_Clear();
}
PyObject *
PyRun_StringFlags(const char *str, int start, PyObject *globals,
PyObject *locals, PyCompilerFlags *flags)
{
PyObject *ret;
PyArena *arena = PyArena_New();
mod_ty mod = PyParser_ASTFromString(str, "<string>", start, flags,
arena);
ret = run_err_mod(mod, "<string>", globals, locals, flags, arena);
PyArena_Free(arena);
return ret;
}
PyObject *
PyRun_FileExFlags(FILE *fp, const char *filename, int start, PyObject *globals,
PyObject *locals, int closeit, PyCompilerFlags *flags)
{
PyObject *ret;
PyArena *arena = PyArena_New();
mod_ty mod = PyParser_ASTFromFile(fp, filename, start, 0, 0,
flags, NULL, arena);
if (mod == NULL) {
PyArena_Free(arena);
return NULL;
}
if (closeit)
fclose(fp);
ret = run_err_mod(mod, filename, globals, locals, flags, arena);
PyArena_Free(arena);
return ret;
}
static PyObject *
run_err_mod(mod_ty mod, const char *filename, PyObject *globals,
PyObject *locals, PyCompilerFlags *flags, PyArena *arena)
{
if (mod == NULL)
return NULL;
return run_mod(mod, filename, globals, locals, flags, arena);
}
static PyObject *
run_mod(mod_ty mod, const char *filename, PyObject *globals, PyObject *locals,
PyCompilerFlags *flags, PyArena *arena)
{
PyCodeObject *co;
PyObject *v;
co = PyAST_Compile(mod, filename, flags, arena);
if (co == NULL)
return NULL;
v = PyEval_EvalCode(co, globals, locals);
Py_DECREF(co);
return v;
}
static PyObject *
run_pyc_file(FILE *fp, const char *filename, PyObject *globals,
PyObject *locals, PyCompilerFlags *flags)
{
PyCodeObject *co;
PyObject *v;
long magic;
long PyImport_GetMagicNumber(void);
magic = PyMarshal_ReadLongFromFile(fp);
if (magic != PyImport_GetMagicNumber()) {
PyErr_SetString(PyExc_RuntimeError,
"Bad magic number in .pyc file");
return NULL;
}
(void) PyMarshal_ReadLongFromFile(fp);
v = PyMarshal_ReadLastObjectFromFile(fp);
fclose(fp);
if (v == NULL || !PyCode_Check(v)) {
Py_XDECREF(v);
PyErr_SetString(PyExc_RuntimeError,
"Bad code object in .pyc file");
return NULL;
}
co = (PyCodeObject *)v;
v = PyEval_EvalCode(co, globals, locals);
if (v && flags)
flags->cf_flags |= (co->co_flags & PyCF_MASK);
Py_DECREF(co);
return v;
}
PyObject *
Py_CompileStringFlags(const char *str, const char *filename, int start,
PyCompilerFlags *flags)
{
PyCodeObject *co;
PyArena *arena = PyArena_New();
mod_ty mod = PyParser_ASTFromString(str, filename, start, flags, arena);
if (mod == NULL) {
PyArena_Free(arena);
return NULL;
}
if (flags->cf_flags & PyCF_ONLY_AST) {
PyObject *result = PyAST_mod2obj(mod);
PyArena_Free(arena);
return result;
}
co = PyAST_Compile(mod, filename, flags, arena);
PyArena_Free(arena);
return (PyObject *)co;
}
struct symtable *
Py_SymtableString(const char *str, const char *filename, int start)
{
struct symtable *st;
PyArena *arena = PyArena_New();
mod_ty mod = PyParser_ASTFromString(str, filename, start, NULL, arena);
if (mod == NULL) {
PyArena_Free(arena);
return NULL;
}
st = PySymtable_Build(mod, filename, 0);
PyArena_Free(arena);
return st;
}
/* Preferred access to parser is through AST. */
mod_ty
PyParser_ASTFromString(const char *s, const char *filename, int start,
PyCompilerFlags *flags, PyArena *arena)
{
mod_ty mod;
perrdetail err;
node *n = PyParser_ParseStringFlagsFilename(s, filename,
&_PyParser_Grammar, start, &err,
PARSER_FLAGS(flags));
if (n) {
mod = PyAST_FromNode(n, flags, filename, arena);
PyNode_Free(n);
return mod;
}
else {
err_input(&err);
return NULL;
}
}
mod_ty
PyParser_ASTFromFile(FILE *fp, const char *filename, int start, char *ps1,
char *ps2, PyCompilerFlags *flags, int *errcode,
PyArena *arena)
{
mod_ty mod;
perrdetail err;
node *n = PyParser_ParseFileFlags(fp, filename, &_PyParser_Grammar,
start, ps1, ps2, &err, PARSER_FLAGS(flags));
if (n) {
mod = PyAST_FromNode(n, flags, filename, arena);
PyNode_Free(n);
return mod;
}
else {
err_input(&err);
if (errcode)
*errcode = err.error;
return NULL;
}
}
/* Simplified interface to parsefile -- return node or set exception */
node *
PyParser_SimpleParseFileFlags(FILE *fp, const char *filename, int start, int flags)
{
perrdetail err;
node *n = PyParser_ParseFileFlags(fp, filename, &_PyParser_Grammar,
start, NULL, NULL, &err, flags);
if (n == NULL)
err_input(&err);
return n;
}
/* Simplified interface to parsestring -- return node or set exception */
node *
PyParser_SimpleParseStringFlags(const char *str, int start, int flags)
{
perrdetail err;
node *n = PyParser_ParseStringFlags(str, &_PyParser_Grammar,
start, &err, flags);
if (n == NULL)
err_input(&err);
return n;
}
node *
PyParser_SimpleParseStringFlagsFilename(const char *str, const char *filename,
int start, int flags)
{
perrdetail err;
node *n = PyParser_ParseStringFlagsFilename(str, filename,
&_PyParser_Grammar, start, &err, flags);
if (n == NULL)
err_input(&err);
return n;
}
node *
PyParser_SimpleParseStringFilename(const char *str, const char *filename, int start)
{
return PyParser_SimpleParseStringFlagsFilename(str, filename, start, 0);
}
/* May want to move a more generalized form of this to parsetok.c or
even parser modules. */
void
PyParser_SetError(perrdetail *err)
{
err_input(err);
}
/* Set the error appropriate to the given input error code (see errcode.h) */
static void
err_input(perrdetail *err)
{
PyObject *v, *w, *errtype;
PyObject* u = NULL;
char *msg = NULL;
errtype = PyExc_SyntaxError;
switch (err->error) {
case E_SYNTAX:
errtype = PyExc_IndentationError;
if (err->expected == INDENT)
msg = "expected an indented block";
else if (err->token == INDENT)
msg = "unexpected indent";
else if (err->token == DEDENT)
msg = "unexpected unindent";
else {
errtype = PyExc_SyntaxError;
msg = "invalid syntax";
}
break;
case E_TOKEN:
msg = "invalid token";
break;
case E_EOFS:
msg = "EOF while scanning triple-quoted string";
break;
case E_EOLS:
msg = "EOL while scanning single-quoted string";
break;
case E_INTR:
if (!PyErr_Occurred())
PyErr_SetNone(PyExc_KeyboardInterrupt);
return;
case E_NOMEM:
PyErr_NoMemory();
return;
case E_EOF:
msg = "unexpected EOF while parsing";
break;
case E_TABSPACE:
errtype = PyExc_TabError;
msg = "inconsistent use of tabs and spaces in indentation";
break;
case E_OVERFLOW:
msg = "expression too long";
break;
case E_DEDENT:
errtype = PyExc_IndentationError;
msg = "unindent does not match any outer indentation level";
break;
case E_TOODEEP:
errtype = PyExc_IndentationError;
msg = "too many levels of indentation";
break;
case E_DECODE: {
PyObject *type, *value, *tb;
PyErr_Fetch(&type, &value, &tb);
if (value != NULL) {
u = PyObject_Str(value);
if (u != NULL) {
msg = PyString_AsString(u);
}
}
if (msg == NULL)
msg = "unknown decode error";
Py_XDECREF(type);
Py_XDECREF(value);
Py_XDECREF(tb);
break;
}
case E_LINECONT:
msg = "unexpected character after line continuation character";
break;
default:
fprintf(stderr, "error=%d\n", err->error);
msg = "unknown parsing error";
break;
}
v = Py_BuildValue("(ziiz)", err->filename,
err->lineno, err->offset, err->text);
if (err->text != NULL) {
PyMem_DEL(err->text);
err->text = NULL;
}
w = NULL;
if (v != NULL)
w = Py_BuildValue("(sO)", msg, v);
Py_XDECREF(u);
Py_XDECREF(v);
PyErr_SetObject(errtype, w);
Py_XDECREF(w);
}
/* Print fatal error message and abort */
void
Py_FatalError(const char *msg)
{
fprintf(stderr, "Fatal Python error: %s\n", msg);
#ifdef MS_WINDOWS
OutputDebugString("Fatal Python error: ");
OutputDebugString(msg);
OutputDebugString("\n");
#ifdef _DEBUG
DebugBreak();
#endif
#endif /* MS_WINDOWS */
abort();
}
/* Clean up and exit */
#ifdef WITH_THREAD
#include "pythread.h"
#endif
#define NEXITFUNCS 32
static void (*exitfuncs[NEXITFUNCS])(void);
static int nexitfuncs = 0;
int Py_AtExit(void (*func)(void))
{
if (nexitfuncs >= NEXITFUNCS)
return -1;
exitfuncs[nexitfuncs++] = func;
return 0;
}
static void
call_sys_exitfunc(void)
{
PyObject *exitfunc = PySys_GetObject("exitfunc");
if (exitfunc) {
PyObject *res;
Py_INCREF(exitfunc);
PySys_SetObject("exitfunc", (PyObject *)NULL);
res = PyEval_CallObject(exitfunc, (PyObject *)NULL);
if (res == NULL) {
if (!PyErr_ExceptionMatches(PyExc_SystemExit)) {
PySys_WriteStderr("Error in sys.exitfunc:\n");
}
PyErr_Print();
}
Py_DECREF(exitfunc);
}
if (Py_FlushLine())
PyErr_Clear();
}
static void
call_ll_exitfuncs(void)
{
while (nexitfuncs > 0)
(*exitfuncs[--nexitfuncs])();
fflush(stdout);
fflush(stderr);
}
void
Py_Exit(int sts)
{
Py_Finalize();
exit(sts);
}
static void
initsigs(void)
{
#ifdef SIGPIPE
PyOS_setsig(SIGPIPE, SIG_IGN);
#endif
#ifdef SIGXFZ
PyOS_setsig(SIGXFZ, SIG_IGN);
#endif
#ifdef SIGXFSZ
PyOS_setsig(SIGXFSZ, SIG_IGN);
#endif
PyOS_InitInterrupts(); /* May imply initsignal() */
}
/*
* The file descriptor fd is considered ``interactive'' if either
* a) isatty(fd) is TRUE, or
* b) the -i flag was given, and the filename associated with
* the descriptor is NULL or "<stdin>" or "???".
*/
int
Py_FdIsInteractive(FILE *fp, const char *filename)
{
if (isatty((int)fileno(fp)))
return 1;
if (!Py_InteractiveFlag)
return 0;
return (filename == NULL) ||
(strcmp(filename, "<stdin>") == 0) ||
(strcmp(filename, "???") == 0);
}
#if defined(USE_STACKCHECK)
#if defined(WIN32) && defined(_MSC_VER)
/* Stack checking for Microsoft C */
#include <malloc.h>
#include <excpt.h>
/*
* Return non-zero when we run out of memory on the stack; zero otherwise.
*/
int
PyOS_CheckStack(void)
{
__try {
/* alloca throws a stack overflow exception if there's
not enough space left on the stack */
alloca(PYOS_STACK_MARGIN * sizeof(void*));
return 0;
} __except (EXCEPTION_EXECUTE_HANDLER) {
/* just ignore all errors */
}
return 1;
}
#endif /* WIN32 && _MSC_VER */
/* Alternate implementations can be added here... */
#endif /* USE_STACKCHECK */
/* Wrappers around sigaction() or signal(). */
PyOS_sighandler_t
PyOS_getsig(int sig)
{
#ifdef HAVE_SIGACTION
struct sigaction context;
if (sigaction(sig, NULL, &context) == -1)
return SIG_ERR;
return context.sa_handler;
#else
PyOS_sighandler_t handler;
/* Special signal handling for the secure CRT in Visual Studio 2005 */
#if defined(_MSC_VER) && _MSC_VER >= 1400
switch (sig) {
/* Only these signals are valid */
case SIGINT:
case SIGILL:
case SIGFPE:
case SIGSEGV:
case SIGTERM:
case SIGBREAK:
case SIGABRT:
break;
/* Don't call signal() with other values or it will assert */
default:
return SIG_ERR;
}
#endif /* _MSC_VER && _MSC_VER >= 1400 */
handler = signal(sig, SIG_IGN);
if (handler != SIG_ERR)
signal(sig, handler);
return handler;
#endif
}
PyOS_sighandler_t
PyOS_setsig(int sig, PyOS_sighandler_t handler)
{
#ifdef HAVE_SIGACTION
struct sigaction context, ocontext;
context.sa_handler = handler;
sigemptyset(&context.sa_mask);
context.sa_flags = 0;
if (sigaction(sig, &context, &ocontext) == -1)
return SIG_ERR;
return ocontext.sa_handler;
#else
PyOS_sighandler_t oldhandler;
oldhandler = signal(sig, handler);
#ifdef HAVE_SIGINTERRUPT
siginterrupt(sig, 1);
#endif
return oldhandler;
#endif
}
/* Deprecated C API functions still provided for binary compatiblity */
#undef PyParser_SimpleParseFile
#undef PyParser_SimpleParseString
node *
PyParser_SimpleParseFile(FILE *fp, const char *filename, int start)
{
return PyParser_SimpleParseFileFlags(fp, filename, start, 0);
}
node *
PyParser_SimpleParseString(const char *str, int start)
{
return PyParser_SimpleParseStringFlags(str, start, 0);
}
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