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cosmopolitan/third_party/python/Python/traceback.c
Justine Tunney 9b29358511 Make whitespace changes 
Status lines for Emacs and Vim have been added to Python sources so
they'll be easier to edit using Python's preferred coding style.

Some DNS helper functions have been broken up into multiple files. It's
nice to have one function per file whenever possible, since that way we
don't need -ffunction-sections.  Another reason it's good to have small
source files, is because the build will be enforcing resource limits on
compilation and testing soon.
2021-08-13 03:20:45 -07:00

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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:4;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=4 sts=4 sw=4 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Python 3 │
│ https://docs.python.org/3/license.html │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/weirdtypes.h"
#include "third_party/python/Include/abstract.h"
#include "third_party/python/Include/bytesobject.h"
#include "third_party/python/Include/code.h"
#include "third_party/python/Include/codecs.h"
#include "third_party/python/Include/dictobject.h"
#include "third_party/python/Include/fileobject.h"
#include "third_party/python/Include/fileutils.h"
#include "third_party/python/Include/frameobject.h"
#include "third_party/python/Include/import.h"
#include "third_party/python/Include/listobject.h"
#include "third_party/python/Include/longobject.h"
#include "third_party/python/Include/modsupport.h"
#include "third_party/python/Include/objimpl.h"
#include "third_party/python/Include/osdefs.h"
#include "third_party/python/Include/pyerrors.h"
#include "third_party/python/Include/structmember.h"
#include "third_party/python/Include/sysmodule.h"
#include "third_party/python/Include/traceback.h"
/* clang-format off */
#define OFF(x) offsetof(PyTracebackObject, x)
#define PUTS(fd, str) _Py_write_noraise(fd, str, (int)strlen(str))
#define MAX_STRING_LENGTH 500
#define MAX_FRAME_DEPTH 100
#define MAX_NTHREADS 100
/* Function from Parser/tokenizer.c */
extern char * PyTokenizer_FindEncodingFilename(int, PyObject *);
_Py_IDENTIFIER(TextIOWrapper);
_Py_IDENTIFIER(close);
_Py_IDENTIFIER(open);
_Py_IDENTIFIER(path);
static PyObject *
tb_dir(PyTracebackObject *self)
{
return Py_BuildValue("[ssss]", "tb_frame", "tb_next",
"tb_lasti", "tb_lineno");
}
static PyMethodDef tb_methods[] = {
{"__dir__", (PyCFunction)tb_dir, METH_NOARGS},
{NULL, NULL, 0, NULL},
};
static PyMemberDef tb_memberlist[] = {
{"tb_next", T_OBJECT, OFF(tb_next), READONLY},
{"tb_frame", T_OBJECT, OFF(tb_frame), READONLY},
{"tb_lasti", T_INT, OFF(tb_lasti), READONLY},
{"tb_lineno", T_INT, OFF(tb_lineno), READONLY},
{NULL} /* Sentinel */
};
static void
tb_dealloc(PyTracebackObject *tb)
{
PyObject_GC_UnTrack(tb);
Py_TRASHCAN_SAFE_BEGIN(tb)
Py_XDECREF(tb->tb_next);
Py_XDECREF(tb->tb_frame);
PyObject_GC_Del(tb);
Py_TRASHCAN_SAFE_END(tb)
}
static int
tb_traverse(PyTracebackObject *tb, visitproc visit, void *arg)
{
Py_VISIT(tb->tb_next);
Py_VISIT(tb->tb_frame);
return 0;
}
static int
tb_clear(PyTracebackObject *tb)
{
Py_CLEAR(tb->tb_next);
Py_CLEAR(tb->tb_frame);
return 0;
}
PyTypeObject PyTraceBack_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"traceback",
sizeof(PyTracebackObject),
0,
(destructor)tb_dealloc, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_reserved*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
0, /* tp_doc */
(traverseproc)tb_traverse, /* tp_traverse */
(inquiry)tb_clear, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
tb_methods, /* tp_methods */
tb_memberlist, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
};
static PyTracebackObject *
newtracebackobject(PyTracebackObject *next, PyFrameObject *frame)
{
PyTracebackObject *tb;
if ((next != NULL && !PyTraceBack_Check(next)) ||
frame == NULL || !PyFrame_Check(frame)) {
PyErr_BadInternalCall();
return NULL;
}
tb = PyObject_GC_New(PyTracebackObject, &PyTraceBack_Type);
if (tb != NULL) {
Py_XINCREF(next);
tb->tb_next = next;
Py_XINCREF(frame);
tb->tb_frame = frame;
tb->tb_lasti = frame->f_lasti;
tb->tb_lineno = PyFrame_GetLineNumber(frame);
PyObject_GC_Track(tb);
}
return tb;
}
int
PyTraceBack_Here(PyFrameObject *frame)
{
PyObject *exc, *val, *tb, *newtb;
PyErr_Fetch(&exc, &val, &tb);
newtb = (PyObject *)newtracebackobject((PyTracebackObject *)tb, frame);
if (newtb == NULL) {
_PyErr_ChainExceptions(exc, val, tb);
return -1;
}
PyErr_Restore(exc, val, newtb);
Py_XDECREF(tb);
return 0;
}
/* Insert a frame into the traceback for (funcname, filename, lineno). */
void _PyTraceback_Add(const char *funcname, const char *filename, int lineno)
{
PyObject *globals;
PyCodeObject *code;
PyFrameObject *frame;
PyObject *exc, *val, *tb;
/* Save and clear the current exception. Python functions must not be
called with an exception set. Calling Python functions happens when
the codec of the filesystem encoding is implemented in pure Python. */
PyErr_Fetch(&exc, &val, &tb);
globals = PyDict_New();
if (!globals)
goto error;
code = PyCode_NewEmpty(filename, funcname, lineno);
if (!code) {
Py_DECREF(globals);
goto error;
}
frame = PyFrame_New(PyThreadState_Get(), code, globals, NULL);
Py_DECREF(globals);
Py_DECREF(code);
if (!frame)
goto error;
frame->f_lineno = lineno;
PyErr_Restore(exc, val, tb);
PyTraceBack_Here(frame);
Py_DECREF(frame);
return;
error:
_PyErr_ChainExceptions(exc, val, tb);
}
static PyObject *
_Py_FindSourceFile(PyObject *filename, char* namebuf, size_t namelen, PyObject *io)
{
Py_ssize_t i;
PyObject *binary;
PyObject *v;
Py_ssize_t npath;
size_t taillen;
PyObject *syspath;
PyObject *path;
const char* tail;
PyObject *filebytes;
const char* filepath;
Py_ssize_t len;
PyObject* result;
filebytes = PyUnicode_EncodeFSDefault(filename);
if (filebytes == NULL) {
PyErr_Clear();
return NULL;
}
filepath = PyBytes_AS_STRING(filebytes);
/* Search tail of filename in sys.path before giving up */
tail = strrchr(filepath, SEP);
if (tail == NULL)
tail = filepath;
else
tail++;
taillen = strlen(tail);
syspath = _PySys_GetObjectId(&PyId_path);
if (syspath == NULL || !PyList_Check(syspath))
goto error;
npath = PyList_Size(syspath);
for (i = 0; i < npath; i++) {
v = PyList_GetItem(syspath, i);
if (v == NULL) {
PyErr_Clear();
break;
}
if (!PyUnicode_Check(v))
continue;
path = PyUnicode_EncodeFSDefault(v);
if (path == NULL) {
PyErr_Clear();
continue;
}
len = PyBytes_GET_SIZE(path);
if (len + 1 + (Py_ssize_t)taillen >= (Py_ssize_t)namelen - 1) {
Py_DECREF(path);
continue; /* Too long */
}
strcpy(namebuf, PyBytes_AS_STRING(path));
Py_DECREF(path);
if (strlen(namebuf) != (size_t)len)
continue; /* v contains '\0' */
if (len > 0 && namebuf[len-1] != SEP)
namebuf[len++] = SEP;
strcpy(namebuf+len, tail);
binary = _PyObject_CallMethodId(io, &PyId_open, "ss", namebuf, "rb");
if (binary != NULL) {
result = binary;
goto finally;
}
PyErr_Clear();
}
goto error;
error:
result = NULL;
finally:
Py_DECREF(filebytes);
return result;
}
int
_Py_DisplaySourceLine(PyObject *f, PyObject *filename, int lineno, int indent)
{
int err = 0;
int fd;
int i;
char *found_encoding;
char *encoding;
PyObject *io;
PyObject *binary;
PyObject *fob = NULL;
PyObject *lineobj = NULL;
PyObject *res;
char buf[MAXPATHLEN+1];
int kind;
void *data;
/* open the file */
if (filename == NULL)
return 0;
io = PyImport_ImportModuleNoBlock("io");
if (io == NULL)
return -1;
binary = _PyObject_CallMethodId(io, &PyId_open, "Os", filename, "rb");
if (binary == NULL) {
PyErr_Clear();
binary = _Py_FindSourceFile(filename, buf, sizeof(buf), io);
if (binary == NULL) {
Py_DECREF(io);
return -1;
}
}
/* use the right encoding to decode the file as unicode */
fd = PyObject_AsFileDescriptor(binary);
if (fd < 0) {
Py_DECREF(io);
Py_DECREF(binary);
return 0;
}
found_encoding = PyTokenizer_FindEncodingFilename(fd, filename);
if (found_encoding == NULL)
PyErr_Clear();
encoding = (found_encoding != NULL) ? found_encoding : "utf-8";
/* Reset position */
if (lseek(fd, 0, SEEK_SET) == (off_t)-1) {
Py_DECREF(io);
Py_DECREF(binary);
PyMem_FREE(found_encoding);
return 0;
}
fob = _PyObject_CallMethodId(io, &PyId_TextIOWrapper, "Os", binary, encoding);
Py_DECREF(io);
PyMem_FREE(found_encoding);
if (fob == NULL) {
PyErr_Clear();
res = _PyObject_CallMethodId(binary, &PyId_close, NULL);
Py_DECREF(binary);
if (res)
Py_DECREF(res);
else
PyErr_Clear();
return 0;
}
Py_DECREF(binary);
/* get the line number lineno */
for (i = 0; i < lineno; i++) {
Py_XDECREF(lineobj);
lineobj = PyFile_GetLine(fob, -1);
if (!lineobj) {
PyErr_Clear();
err = -1;
break;
}
}
res = _PyObject_CallMethodId(fob, &PyId_close, NULL);
if (res)
Py_DECREF(res);
else
PyErr_Clear();
Py_DECREF(fob);
if (!lineobj || !PyUnicode_Check(lineobj)) {
Py_XDECREF(lineobj);
return err;
}
/* remove the indentation of the line */
kind = PyUnicode_KIND(lineobj);
data = PyUnicode_DATA(lineobj);
for (i=0; i < PyUnicode_GET_LENGTH(lineobj); i++) {
Py_UCS4 ch = PyUnicode_READ(kind, data, i);
if (ch != ' ' && ch != '\t' && ch != '\014')
break;
}
if (i) {
PyObject *truncated;
truncated = PyUnicode_Substring(lineobj, i, PyUnicode_GET_LENGTH(lineobj));
if (truncated) {
Py_DECREF(lineobj);
lineobj = truncated;
} else {
PyErr_Clear();
}
}
/* Write some spaces before the line */
strcpy(buf, " ");
assert (strlen(buf) == 10);
while (indent > 0) {
if (indent < 10)
buf[indent] = '\0';
err = PyFile_WriteString(buf, f);
if (err != 0)
break;
indent -= 10;
}
/* finally display the line */
if (err == 0)
err = PyFile_WriteObject(lineobj, f, Py_PRINT_RAW);
Py_DECREF(lineobj);
if (err == 0)
err = PyFile_WriteString("\n", f);
return err;
}
static int
tb_displayline(PyObject *f, PyObject *filename, int lineno, PyObject *name)
{
int err;
PyObject *line;
if (filename == NULL || name == NULL)
return -1;
line = PyUnicode_FromFormat(" File \"%U\", line %d, in %U\n",
filename, lineno, name);
if (line == NULL)
return -1;
err = PyFile_WriteObject(line, f, Py_PRINT_RAW);
Py_DECREF(line);
if (err != 0)
return err;
/* ignore errors since we can't report them, can we? */
if (_Py_DisplaySourceLine(f, filename, lineno, 4))
PyErr_Clear();
return err;
}
static const int TB_RECURSIVE_CUTOFF = 3; // Also hardcoded in traceback.py.
static int
tb_print_line_repeated(PyObject *f, long cnt)
{
cnt -= TB_RECURSIVE_CUTOFF;
PyObject *line = PyUnicode_FromFormat(
(cnt > 1)
? " [Previous line repeated %ld more times]\n"
: " [Previous line repeated %ld more time]\n",
cnt);
if (line == NULL) {
return -1;
}
int err = PyFile_WriteObject(line, f, Py_PRINT_RAW);
Py_DECREF(line);
return err;
}
static int
tb_printinternal(PyTracebackObject *tb, PyObject *f, long limit)
{
int err = 0;
Py_ssize_t depth = 0;
PyObject *last_file = NULL;
int last_line = -1;
PyObject *last_name = NULL;
long cnt = 0;
PyTracebackObject *tb1 = tb;
while (tb1 != NULL) {
depth++;
tb1 = tb1->tb_next;
}
while (tb != NULL && depth > limit) {
depth--;
tb = tb->tb_next;
}
while (tb != NULL && err == 0) {
if (last_file == NULL ||
tb->tb_frame->f_code->co_filename != last_file ||
last_line == -1 || tb->tb_lineno != last_line ||
last_name == NULL || tb->tb_frame->f_code->co_name != last_name) {
if (cnt > TB_RECURSIVE_CUTOFF) {
err = tb_print_line_repeated(f, cnt);
}
last_file = tb->tb_frame->f_code->co_filename;
last_line = tb->tb_lineno;
last_name = tb->tb_frame->f_code->co_name;
cnt = 0;
}
cnt++;
if (err == 0 && cnt <= TB_RECURSIVE_CUTOFF) {
err = tb_displayline(f,
tb->tb_frame->f_code->co_filename,
tb->tb_lineno,
tb->tb_frame->f_code->co_name);
if (err == 0) {
err = PyErr_CheckSignals();
}
}
tb = tb->tb_next;
}
if (err == 0 && cnt > TB_RECURSIVE_CUTOFF) {
err = tb_print_line_repeated(f, cnt);
}
return err;
}
#define PyTraceBack_LIMIT 1000
int
PyTraceBack_Print(PyObject *v, PyObject *f)
{
int err;
PyObject *limitv;
long limit = PyTraceBack_LIMIT;
if (v == NULL)
return 0;
if (!PyTraceBack_Check(v)) {
PyErr_BadInternalCall();
return -1;
}
limitv = PySys_GetObject("tracebacklimit");
if (limitv && PyLong_Check(limitv)) {
int overflow;
limit = PyLong_AsLongAndOverflow(limitv, &overflow);
if (overflow > 0) {
limit = LONG_MAX;
}
else if (limit <= 0) {
return 0;
}
}
err = PyFile_WriteString("Traceback (most recent call last):\n", f);
if (!err)
err = tb_printinternal((PyTracebackObject *)v, f, limit);
return err;
}
/* Reverse a string. For example, "abcd" becomes "dcba".
This function is signal safe. */
void
_Py_DumpDecimal(int fd, unsigned long value)
{
/* maximum number of characters required for output of %lld or %p.
We need at most ceil(log10(256)*SIZEOF_LONG_LONG) digits,
plus 1 for the null byte. 53/22 is an upper bound for log10(256). */
char buffer[1 + (sizeof(unsigned long)*53-1) / 22 + 1];
char *ptr, *end;
end = &buffer[Py_ARRAY_LENGTH(buffer) - 1];
ptr = end;
*ptr = '\0';
do {
--ptr;
assert(ptr >= buffer);
*ptr = '0' + (value % 10);
value /= 10;
} while (value);
_Py_write_noraise(fd, ptr, end - ptr);
}
/* Format an integer in range [0; 0xffffffff] to hexadecimal of 'width' digits,
and write it into the file fd.
This function is signal safe. */
void
_Py_DumpHexadecimal(int fd, unsigned long value, Py_ssize_t width)
{
char buffer[sizeof(unsigned long) * 2 + 1], *ptr, *end;
const Py_ssize_t size = Py_ARRAY_LENGTH(buffer) - 1;
if (width > size)
width = size;
/* it's ok if width is negative */
end = &buffer[size];
ptr = end;
*ptr = '\0';
do {
--ptr;
assert(ptr >= buffer);
*ptr = Py_hexdigits[value & 15];
value >>= 4;
} while ((end - ptr) < width || value);
_Py_write_noraise(fd, ptr, end - ptr);
}
void
_Py_DumpASCII(int fd, PyObject *text)
{
PyASCIIObject *ascii = (PyASCIIObject *)text;
Py_ssize_t i, size;
int truncated;
int kind;
void *data = NULL;
wchar_t *wstr = NULL;
Py_UCS4 ch;
if (!PyUnicode_Check(text))
return;
size = ascii->length;
kind = ascii->state.kind;
if (kind == PyUnicode_WCHAR_KIND) {
wstr = ((PyASCIIObject *)text)->wstr;
if (wstr == NULL)
return;
size = ((PyCompactUnicodeObject *)text)->wstr_length;
}
else if (ascii->state.compact) {
if (ascii->state.ascii)
data = ((PyASCIIObject*)text) + 1;
else
data = ((PyCompactUnicodeObject*)text) + 1;
}
else {
data = ((PyUnicodeObject *)text)->data.any;
if (data == NULL)
return;
}
if (MAX_STRING_LENGTH < size) {
size = MAX_STRING_LENGTH;
truncated = 1;
}
else {
truncated = 0;
}
for (i=0; i < size; i++) {
if (kind != PyUnicode_WCHAR_KIND)
ch = PyUnicode_READ(kind, data, i);
else
ch = wstr[i];
if (' ' <= ch && ch <= 126) {
/* printable ASCII character */
char c = (char)ch;
_Py_write_noraise(fd, &c, 1);
}
else if (ch <= 0xff) {
PUTS(fd, "\\x");
_Py_DumpHexadecimal(fd, ch, 2);
}
else if (ch <= 0xffff) {
PUTS(fd, "\\u");
_Py_DumpHexadecimal(fd, ch, 4);
}
else {
PUTS(fd, "\\U");
_Py_DumpHexadecimal(fd, ch, 8);
}
}
if (truncated) {
PUTS(fd, "...");
}
}
/* Write a frame into the file fd: "File "xxx", line xxx in xxx".
This function is signal safe. */
static void
dump_frame(int fd, PyFrameObject *frame)
{
PyCodeObject *code;
int lineno;
code = frame->f_code;
PUTS(fd, " File ");
if (code != NULL && code->co_filename != NULL
&& PyUnicode_Check(code->co_filename))
{
PUTS(fd, "\"");
_Py_DumpASCII(fd, code->co_filename);
PUTS(fd, "\"");
} else {
PUTS(fd, "???");
}
/* PyFrame_GetLineNumber() was introduced in Python 2.7.0 and 3.2.0 */
lineno = PyCode_Addr2Line(code, frame->f_lasti);
PUTS(fd, ", line ");
if (lineno >= 0) {
_Py_DumpDecimal(fd, (unsigned long)lineno);
}
else {
PUTS(fd, "???");
}
PUTS(fd, " in ");
if (code != NULL && code->co_name != NULL
&& PyUnicode_Check(code->co_name)) {
_Py_DumpASCII(fd, code->co_name);
}
else {
PUTS(fd, "???");
}
PUTS(fd, "\n");
}
static void
dump_traceback(int fd, PyThreadState *tstate, int write_header)
{
PyFrameObject *frame;
unsigned int depth;
if (write_header)
PUTS(fd, "Stack (most recent call first):\n");
frame = _PyThreadState_GetFrame(tstate);
if (frame == NULL)
return;
depth = 0;
while (frame != NULL) {
if (MAX_FRAME_DEPTH <= depth) {
PUTS(fd, " ...\n");
break;
}
if (!PyFrame_Check(frame))
break;
dump_frame(fd, frame);
frame = frame->f_back;
depth++;
}
}
/* Dump the traceback of a Python thread into fd. Use write() to write the
traceback and retry if write() is interrupted by a signal (failed with
EINTR), but don't call the Python signal handler.
The caller is responsible to call PyErr_CheckSignals() to call Python signal
handlers if signals were received. */
void
_Py_DumpTraceback(int fd, PyThreadState *tstate)
{
dump_traceback(fd, tstate, 1);
}
/* Write the thread identifier into the file 'fd': "Current thread 0xHHHH:\" if
is_current is true, "Thread 0xHHHH:\n" otherwise.
This function is signal safe. */
static void
write_thread_id(int fd, PyThreadState *tstate, int is_current)
{
if (is_current)
PUTS(fd, "Current thread 0x");
else
PUTS(fd, "Thread 0x");
_Py_DumpHexadecimal(fd,
(unsigned long)tstate->thread_id,
sizeof(unsigned long) * 2);
PUTS(fd, " (most recent call first):\n");
}
/* Dump the traceback of all Python threads into fd. Use write() to write the
traceback and retry if write() is interrupted by a signal (failed with
EINTR), but don't call the Python signal handler.
The caller is responsible to call PyErr_CheckSignals() to call Python signal
handlers if signals were received. */
const char*
_Py_DumpTracebackThreads(int fd, PyInterpreterState *interp,
PyThreadState *current_tstate)
{
PyThreadState *tstate;
unsigned int nthreads;
#ifdef WITH_THREAD
if (current_tstate == NULL) {
/* _Py_DumpTracebackThreads() is called from signal handlers by
faulthandler.
SIGSEGV, SIGFPE, SIGABRT, SIGBUS and SIGILL are synchronous signals
and are thus delivered to the thread that caused the fault. Get the
Python thread state of the current thread.
PyThreadState_Get() doesn't give the state of the thread that caused
the fault if the thread released the GIL, and so this function
cannot be used. Read the thread local storage (TLS) instead: call
PyGILState_GetThisThreadState(). */
current_tstate = PyGILState_GetThisThreadState();
}
if (interp == NULL) {
if (current_tstate == NULL) {
interp = _PyGILState_GetInterpreterStateUnsafe();
if (interp == NULL) {
/* We need the interpreter state to get Python threads */
return "unable to get the interpreter state";
}
}
else {
interp = current_tstate->interp;
}
}
#else
if (current_tstate == NULL) {
/* Call _PyThreadState_UncheckedGet() instead of PyThreadState_Get()
to not fail with a fatal error if the thread state is NULL. */
current_tstate = _PyThreadState_UncheckedGet();
}
if (interp == NULL) {
if (current_tstate == NULL) {
/* We need the interpreter state to get Python threads */
return "unable to get the interpreter state";
}
interp = current_tstate->interp;
}
#endif
assert(interp != NULL);
/* Get the current interpreter from the current thread */
tstate = PyInterpreterState_ThreadHead(interp);
if (tstate == NULL)
return "unable to get the thread head state";
/* Dump the traceback of each thread */
tstate = PyInterpreterState_ThreadHead(interp);
nthreads = 0;
_Py_BEGIN_SUPPRESS_IPH
do
{
if (nthreads != 0)
PUTS(fd, "\n");
if (nthreads >= MAX_NTHREADS) {
PUTS(fd, "...\n");
break;
}
write_thread_id(fd, tstate, tstate == current_tstate);
dump_traceback(fd, tstate, 0);
tstate = PyThreadState_Next(tstate);
nthreads++;
} while (tstate != NULL);
_Py_END_SUPPRESS_IPH
return NULL;
}
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