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bpo-30604: clean up co_extra support (#2144)

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bpo-30604: port fix from 3.6 dropping binary compatibility tweaks
This commit is contained in:
Dino Viehland 2017-06-21 14:44:36 -07:00 committed by Yury Selivanov
parent c90e960150
commit f3cffd2b78
6 changed files with 130 additions and 23 deletions
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7
Include/pystate.h
View file

@ -74,6 +74,10 @@ typedef struct _is {
PyObject *import_func;
/* Initialized to PyEval_EvalFrameDefault(). */
_PyFrameEvalFunction eval_frame;
Py_ssize_t co_extra_user_count;
freefunc co_extra_freefuncs[MAX_CO_EXTRA_USERS];
#ifdef HAVE_FORK
PyObject *before_forkers;
PyObject *after_forkers_parent;
@ -173,9 +177,6 @@ typedef struct _ts {
PyObject *coroutine_wrapper;
int in_coroutine_wrapper;
Py_ssize_t co_extra_user_count;
freefunc co_extra_freefuncs[MAX_CO_EXTRA_USERS];
PyObject *async_gen_firstiter;
PyObject *async_gen_finalizer;

103
Lib/test/test_code.py
View file

@ -103,9 +103,11 @@
"""
import sys
import threading
import unittest
import weakref
from test.support import run_doctest, run_unittest, cpython_only
from test.support import (run_doctest, run_unittest, cpython_only,
check_impl_detail)
def consts(t):
@ -212,11 +214,106 @@ def callback(code):
self.assertTrue(self.called)
if check_impl_detail(cpython=True):
import ctypes
py = ctypes.pythonapi
freefunc = ctypes.CFUNCTYPE(None,ctypes.c_voidp)
RequestCodeExtraIndex = py._PyEval_RequestCodeExtraIndex
RequestCodeExtraIndex.argtypes = (freefunc,)
RequestCodeExtraIndex.restype = ctypes.c_ssize_t
SetExtra = py._PyCode_SetExtra
SetExtra.argtypes = (ctypes.py_object, ctypes.c_ssize_t, ctypes.c_voidp)
SetExtra.restype = ctypes.c_int
GetExtra = py._PyCode_GetExtra
GetExtra.argtypes = (ctypes.py_object, ctypes.c_ssize_t,
ctypes.POINTER(ctypes.c_voidp))
GetExtra.restype = ctypes.c_int
LAST_FREED = None
def myfree(ptr):
global LAST_FREED
LAST_FREED = ptr
FREE_FUNC = freefunc(myfree)
FREE_INDEX = RequestCodeExtraIndex(FREE_FUNC)
class CoExtra(unittest.TestCase):
def get_func(self):
# Defining a function causes the containing function to have a
# reference to the code object. We need the code objects to go
# away, so we eval a lambda.
return eval('lambda:42')
def test_get_non_code(self):
f = self.get_func()
self.assertRaises(SystemError, SetExtra, 42, FREE_INDEX,
ctypes.c_voidp(100))
self.assertRaises(SystemError, GetExtra, 42, FREE_INDEX,
ctypes.c_voidp(100))
def test_bad_index(self):
f = self.get_func()
self.assertRaises(SystemError, SetExtra, f.__code__,
FREE_INDEX+100, ctypes.c_voidp(100))
self.assertEqual(GetExtra(f.__code__, FREE_INDEX+100,
ctypes.c_voidp(100)), 0)
def test_free_called(self):
# Verify that the provided free function gets invoked
# when the code object is cleaned up.
f = self.get_func()
SetExtra(f.__code__, FREE_INDEX, ctypes.c_voidp(100))
del f
self.assertEqual(LAST_FREED, 100)
def test_get_set(self):
# Test basic get/set round tripping.
f = self.get_func()
extra = ctypes.c_voidp()
SetExtra(f.__code__, FREE_INDEX, ctypes.c_voidp(200))
# reset should free...
SetExtra(f.__code__, FREE_INDEX, ctypes.c_voidp(300))
self.assertEqual(LAST_FREED, 200)
extra = ctypes.c_voidp()
GetExtra(f.__code__, FREE_INDEX, extra)
self.assertEqual(extra.value, 300)
del f
def test_free_different_thread(self):
# Freeing a code object on a different thread then
# where the co_extra was set should be safe.
f = self.get_func()
class ThreadTest(threading.Thread):
def __init__(self, f, test):
super().__init__()
self.f = f
self.test = test
def run(self):
del self.f
self.test.assertEqual(LAST_FREED, 500)
SetExtra(f.__code__, FREE_INDEX, ctypes.c_voidp(500))
tt = ThreadTest(f, self)
del f
tt.start()
tt.join()
self.assertEqual(LAST_FREED, 500)
def test_main(verbose=None):
from test import test_code
run_doctest(test_code, verbose)
run_unittest(CodeTest, CodeConstsTest, CodeWeakRefTest)
tests = [CodeTest, CodeConstsTest, CodeWeakRefTest]
if check_impl_detail(cpython=True):
tests.append(CoExtra)
run_unittest(*tests)
if __name__ == "__main__":
test_main()

3
Misc/NEWS
View file

@ -10,6 +10,9 @@ What's New in Python 3.7.0 alpha 1?
Core and Builtins
-----------------
- bpo-30604: Move co_extra_freefuncs from per-thread to per-interpreter to
avoid crashes.
- bpo-30597: ``print`` now shows expected input in custom error message when
used as a Python 2 statement. Patch by Sanyam Khurana.

30
Objects/codeobject.c
View file

@ -416,11 +416,11 @@ static void
code_dealloc(PyCodeObject *co)
{
if (co->co_extra != NULL) {
PyThreadState *tstate = PyThreadState_Get();
PyInterpreterState *interp = PyThreadState_Get()->interp;
_PyCodeObjectExtra *co_extra = co->co_extra;
for (Py_ssize_t i = 0; i < co_extra->ce_size; i++) {
freefunc free_extra = tstate->co_extra_freefuncs[i];
freefunc free_extra = interp->co_extra_freefuncs[i];
if (free_extra != NULL) {
free_extra(co_extra->ce_extras[i]);
@ -830,8 +830,6 @@ _PyCode_CheckLineNumber(PyCodeObject* co, int lasti, PyAddrPair *bounds)
int
_PyCode_GetExtra(PyObject *code, Py_ssize_t index, void **extra)
{
assert(*extra == NULL);
if (!PyCode_Check(code)) {
PyErr_BadInternalCall();
return -1;
@ -840,8 +838,8 @@ _PyCode_GetExtra(PyObject *code, Py_ssize_t index, void **extra)
PyCodeObject *o = (PyCodeObject*) code;
_PyCodeObjectExtra *co_extra = (_PyCodeObjectExtra*) o->co_extra;
if (co_extra == NULL || co_extra->ce_size <= index) {
*extra = NULL;
return 0;
}
@ -853,10 +851,10 @@ _PyCode_GetExtra(PyObject *code, Py_ssize_t index, void **extra)
int
_PyCode_SetExtra(PyObject *code, Py_ssize_t index, void *extra)
{
PyThreadState *tstate = PyThreadState_Get();
PyInterpreterState *interp = PyThreadState_Get()->interp;
if (!PyCode_Check(code) || index < 0 ||
index >= tstate->co_extra_user_count) {
index >= interp->co_extra_user_count) {
PyErr_BadInternalCall();
return -1;
}
@ -871,13 +869,13 @@ _PyCode_SetExtra(PyObject *code, Py_ssize_t index, void *extra)
}
co_extra->ce_extras = PyMem_Malloc(
tstate->co_extra_user_count * sizeof(void*));
interp->co_extra_user_count * sizeof(void*));
if (co_extra->ce_extras == NULL) {
PyMem_Free(co_extra);
return -1;
}
co_extra->ce_size = tstate->co_extra_user_count;
co_extra->ce_size = interp->co_extra_user_count;
for (Py_ssize_t i = 0; i < co_extra->ce_size; i++) {
co_extra->ce_extras[i] = NULL;
@ -887,20 +885,28 @@ _PyCode_SetExtra(PyObject *code, Py_ssize_t index, void *extra)
}
else if (co_extra->ce_size <= index) {
void** ce_extras = PyMem_Realloc(
co_extra->ce_extras, tstate->co_extra_user_count * sizeof(void*));
co_extra->ce_extras, interp->co_extra_user_count * sizeof(void*));
if (ce_extras == NULL) {
return -1;
}
for (Py_ssize_t i = co_extra->ce_size;
i < tstate->co_extra_user_count;
i < interp->co_extra_user_count;
i++) {
ce_extras[i] = NULL;
}
co_extra->ce_extras = ce_extras;
co_extra->ce_size = tstate->co_extra_user_count;
co_extra->ce_size = interp->co_extra_user_count;
}
if (co_extra->ce_extras[index] != NULL) {
freefunc free = interp->co_extra_freefuncs[index];
if (free != NULL) {
free(co_extra->ce_extras[index]);
}
}
co_extra->ce_extras[index] = extra;

8
Python/ceval.c
View file

@ -5287,14 +5287,14 @@ _Py_GetDXProfile(PyObject *self, PyObject *args)
Py_ssize_t
_PyEval_RequestCodeExtraIndex(freefunc free)
{
PyThreadState *tstate = PyThreadState_Get();
PyInterpreterState *interp = PyThreadState_Get()->interp;
Py_ssize_t new_index;
if (tstate->co_extra_user_count == MAX_CO_EXTRA_USERS - 1) {
if (interp->co_extra_user_count == MAX_CO_EXTRA_USERS - 1) {
return -1;
}
new_index = tstate->co_extra_user_count++;
tstate->co_extra_freefuncs[new_index] = free;
new_index = interp->co_extra_user_count++;
interp->co_extra_freefuncs[new_index] = free;
return new_index;
}

2
Python/pystate.c
View file

@ -111,6 +111,7 @@ PyInterpreterState_New(void)
interp->importlib = NULL;
interp->import_func = NULL;
interp->eval_frame = _PyEval_EvalFrameDefault;
interp->co_extra_user_count = 0;
#ifdef HAVE_DLOPEN
#if HAVE_DECL_RTLD_NOW
interp->dlopenflags = RTLD_NOW;
@ -281,7 +282,6 @@ new_threadstate(PyInterpreterState *interp, int init)
tstate->coroutine_wrapper = NULL;
tstate->in_coroutine_wrapper = 0;
tstate->co_extra_user_count = 0;
tstate->async_gen_firstiter = NULL;
tstate->async_gen_finalizer = NULL;