mirror of https://github.com/python/cpython
708 lines
19 KiB
C
708 lines
19 KiB
C
#include "parts.h"
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#include "clinic/watchers.c.h"
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#define Py_BUILD_CORE
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#include "pycore_function.h" // FUNC_MAX_WATCHERS
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#include "pycore_code.h" // CODE_MAX_WATCHERS
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/*[clinic input]
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module _testcapi
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[clinic start generated code]*/
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/*[clinic end generated code: output=da39a3ee5e6b4b0d input=6361033e795369fc]*/
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// Test dict watching
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static PyObject *g_dict_watch_events;
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static int g_dict_watchers_installed;
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static int
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dict_watch_callback(PyDict_WatchEvent event,
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PyObject *dict,
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PyObject *key,
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PyObject *new_value)
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{
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PyObject *msg;
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switch (event) {
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case PyDict_EVENT_CLEARED:
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msg = PyUnicode_FromString("clear");
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break;
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case PyDict_EVENT_DEALLOCATED:
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msg = PyUnicode_FromString("dealloc");
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break;
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case PyDict_EVENT_CLONED:
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msg = PyUnicode_FromString("clone");
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break;
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case PyDict_EVENT_ADDED:
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msg = PyUnicode_FromFormat("new:%S:%S", key, new_value);
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break;
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case PyDict_EVENT_MODIFIED:
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msg = PyUnicode_FromFormat("mod:%S:%S", key, new_value);
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break;
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case PyDict_EVENT_DELETED:
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msg = PyUnicode_FromFormat("del:%S", key);
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break;
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default:
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msg = PyUnicode_FromString("unknown");
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}
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if (msg == NULL) {
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return -1;
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}
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assert(PyList_Check(g_dict_watch_events));
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if (PyList_Append(g_dict_watch_events, msg) < 0) {
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Py_DECREF(msg);
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return -1;
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}
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Py_DECREF(msg);
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return 0;
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}
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static int
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dict_watch_callback_second(PyDict_WatchEvent event,
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PyObject *dict,
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PyObject *key,
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PyObject *new_value)
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{
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PyObject *msg = PyUnicode_FromString("second");
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if (msg == NULL) {
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return -1;
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}
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int rc = PyList_Append(g_dict_watch_events, msg);
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Py_DECREF(msg);
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if (rc < 0) {
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return -1;
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}
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return 0;
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}
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static int
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dict_watch_callback_error(PyDict_WatchEvent event,
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PyObject *dict,
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PyObject *key,
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PyObject *new_value)
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{
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PyErr_SetString(PyExc_RuntimeError, "boom!");
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return -1;
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}
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static PyObject *
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add_dict_watcher(PyObject *self, PyObject *kind)
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{
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int watcher_id;
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assert(PyLong_Check(kind));
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long kind_l = PyLong_AsLong(kind);
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if (kind_l == 2) {
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watcher_id = PyDict_AddWatcher(dict_watch_callback_second);
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}
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else if (kind_l == 1) {
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watcher_id = PyDict_AddWatcher(dict_watch_callback_error);
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}
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else {
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watcher_id = PyDict_AddWatcher(dict_watch_callback);
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}
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if (watcher_id < 0) {
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return NULL;
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}
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if (!g_dict_watchers_installed) {
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assert(!g_dict_watch_events);
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if (!(g_dict_watch_events = PyList_New(0))) {
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return NULL;
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}
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}
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g_dict_watchers_installed++;
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return PyLong_FromLong(watcher_id);
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}
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static PyObject *
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clear_dict_watcher(PyObject *self, PyObject *watcher_id)
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{
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if (PyDict_ClearWatcher(PyLong_AsLong(watcher_id))) {
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return NULL;
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}
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g_dict_watchers_installed--;
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if (!g_dict_watchers_installed) {
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assert(g_dict_watch_events);
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Py_CLEAR(g_dict_watch_events);
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}
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Py_RETURN_NONE;
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}
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/*[clinic input]
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_testcapi.watch_dict
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watcher_id: int
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dict: object
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/
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[clinic start generated code]*/
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static PyObject *
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_testcapi_watch_dict_impl(PyObject *module, int watcher_id, PyObject *dict)
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/*[clinic end generated code: output=1426e0273cebe2d8 input=269b006d60c358bd]*/
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{
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if (PyDict_Watch(watcher_id, dict)) {
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return NULL;
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}
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Py_RETURN_NONE;
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}
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/*[clinic input]
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_testcapi.unwatch_dict = _testcapi.watch_dict
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[clinic start generated code]*/
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static PyObject *
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_testcapi_unwatch_dict_impl(PyObject *module, int watcher_id, PyObject *dict)
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/*[clinic end generated code: output=512b1a71ae33c351 input=cae7dc1b6f7713b8]*/
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{
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if (PyDict_Unwatch(watcher_id, dict)) {
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return NULL;
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}
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Py_RETURN_NONE;
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}
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static PyObject *
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get_dict_watcher_events(PyObject *self, PyObject *Py_UNUSED(args))
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{
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if (!g_dict_watch_events) {
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PyErr_SetString(PyExc_RuntimeError, "no watchers active");
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return NULL;
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}
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return Py_NewRef(g_dict_watch_events);
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}
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// Test type watchers
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static PyObject *g_type_modified_events;
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static int g_type_watchers_installed;
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static int
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type_modified_callback(PyTypeObject *type)
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{
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assert(PyList_Check(g_type_modified_events));
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if(PyList_Append(g_type_modified_events, (PyObject *)type) < 0) {
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return -1;
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}
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return 0;
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}
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static int
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type_modified_callback_wrap(PyTypeObject *type)
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{
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assert(PyList_Check(g_type_modified_events));
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PyObject *list = PyList_New(0);
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if (list == NULL) {
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return -1;
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}
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if (PyList_Append(list, (PyObject *)type) < 0) {
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Py_DECREF(list);
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return -1;
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}
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if (PyList_Append(g_type_modified_events, list) < 0) {
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Py_DECREF(list);
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return -1;
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}
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Py_DECREF(list);
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return 0;
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}
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static int
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type_modified_callback_error(PyTypeObject *type)
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{
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PyErr_SetString(PyExc_RuntimeError, "boom!");
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return -1;
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}
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static PyObject *
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add_type_watcher(PyObject *self, PyObject *kind)
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{
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int watcher_id;
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assert(PyLong_Check(kind));
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long kind_l = PyLong_AsLong(kind);
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if (kind_l == 2) {
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watcher_id = PyType_AddWatcher(type_modified_callback_wrap);
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}
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else if (kind_l == 1) {
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watcher_id = PyType_AddWatcher(type_modified_callback_error);
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}
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else {
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watcher_id = PyType_AddWatcher(type_modified_callback);
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}
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if (watcher_id < 0) {
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return NULL;
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}
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if (!g_type_watchers_installed) {
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assert(!g_type_modified_events);
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if (!(g_type_modified_events = PyList_New(0))) {
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return NULL;
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}
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}
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g_type_watchers_installed++;
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return PyLong_FromLong(watcher_id);
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}
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static PyObject *
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clear_type_watcher(PyObject *self, PyObject *watcher_id)
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{
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if (PyType_ClearWatcher(PyLong_AsLong(watcher_id))) {
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return NULL;
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}
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g_type_watchers_installed--;
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if (!g_type_watchers_installed) {
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assert(g_type_modified_events);
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Py_CLEAR(g_type_modified_events);
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}
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Py_RETURN_NONE;
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}
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static PyObject *
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get_type_modified_events(PyObject *self, PyObject *Py_UNUSED(args))
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{
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if (!g_type_modified_events) {
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PyErr_SetString(PyExc_RuntimeError, "no watchers active");
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return NULL;
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}
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return Py_NewRef(g_type_modified_events);
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}
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/*[clinic input]
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_testcapi.watch_type
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watcher_id: int
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type: object
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/
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[clinic start generated code]*/
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static PyObject *
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_testcapi_watch_type_impl(PyObject *module, int watcher_id, PyObject *type)
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/*[clinic end generated code: output=fdf4777126724fc4 input=5a808bf12be7e3ed]*/
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{
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if (PyType_Watch(watcher_id, type)) {
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return NULL;
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}
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Py_RETURN_NONE;
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}
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/*[clinic input]
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_testcapi.unwatch_type = _testcapi.watch_type
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[clinic start generated code]*/
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static PyObject *
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_testcapi_unwatch_type_impl(PyObject *module, int watcher_id, PyObject *type)
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/*[clinic end generated code: output=0389672d4ad5f68b input=6701911fb45edc9e]*/
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{
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if (PyType_Unwatch(watcher_id, type)) {
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return NULL;
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}
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Py_RETURN_NONE;
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}
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// Test code object watching
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#define NUM_CODE_WATCHERS 2
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static int num_code_object_created_events[NUM_CODE_WATCHERS] = {0, 0};
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static int num_code_object_destroyed_events[NUM_CODE_WATCHERS] = {0, 0};
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static int
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handle_code_object_event(int which_watcher, PyCodeEvent event, PyCodeObject *co) {
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if (event == PY_CODE_EVENT_CREATE) {
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num_code_object_created_events[which_watcher]++;
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}
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else if (event == PY_CODE_EVENT_DESTROY) {
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num_code_object_destroyed_events[which_watcher]++;
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}
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else {
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return -1;
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}
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return 0;
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}
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static int
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first_code_object_callback(PyCodeEvent event, PyCodeObject *co)
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{
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return handle_code_object_event(0, event, co);
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}
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static int
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second_code_object_callback(PyCodeEvent event, PyCodeObject *co)
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{
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return handle_code_object_event(1, event, co);
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}
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static int
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noop_code_event_handler(PyCodeEvent event, PyCodeObject *co)
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{
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return 0;
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}
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static int
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error_code_event_handler(PyCodeEvent event, PyCodeObject *co)
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{
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PyErr_SetString(PyExc_RuntimeError, "boom!");
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return -1;
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}
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static PyObject *
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add_code_watcher(PyObject *self, PyObject *which_watcher)
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{
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int watcher_id;
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assert(PyLong_Check(which_watcher));
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long which_l = PyLong_AsLong(which_watcher);
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if (which_l == 0) {
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watcher_id = PyCode_AddWatcher(first_code_object_callback);
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num_code_object_created_events[0] = 0;
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num_code_object_destroyed_events[0] = 0;
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}
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else if (which_l == 1) {
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watcher_id = PyCode_AddWatcher(second_code_object_callback);
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num_code_object_created_events[1] = 0;
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num_code_object_destroyed_events[1] = 0;
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}
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else if (which_l == 2) {
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watcher_id = PyCode_AddWatcher(error_code_event_handler);
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}
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else {
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PyErr_Format(PyExc_ValueError, "invalid watcher %d", which_l);
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return NULL;
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}
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if (watcher_id < 0) {
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return NULL;
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}
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return PyLong_FromLong(watcher_id);
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}
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static PyObject *
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clear_code_watcher(PyObject *self, PyObject *watcher_id)
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{
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assert(PyLong_Check(watcher_id));
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long watcher_id_l = PyLong_AsLong(watcher_id);
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if (PyCode_ClearWatcher(watcher_id_l) < 0) {
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return NULL;
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}
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// reset static events counters
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if (watcher_id_l >= 0 && watcher_id_l < NUM_CODE_WATCHERS) {
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num_code_object_created_events[watcher_id_l] = 0;
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num_code_object_destroyed_events[watcher_id_l] = 0;
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}
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Py_RETURN_NONE;
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}
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static PyObject *
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get_code_watcher_num_created_events(PyObject *self, PyObject *watcher_id)
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{
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assert(PyLong_Check(watcher_id));
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long watcher_id_l = PyLong_AsLong(watcher_id);
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assert(watcher_id_l >= 0 && watcher_id_l < NUM_CODE_WATCHERS);
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return PyLong_FromLong(num_code_object_created_events[watcher_id_l]);
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}
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static PyObject *
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get_code_watcher_num_destroyed_events(PyObject *self, PyObject *watcher_id)
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{
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assert(PyLong_Check(watcher_id));
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long watcher_id_l = PyLong_AsLong(watcher_id);
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assert(watcher_id_l >= 0 && watcher_id_l < NUM_CODE_WATCHERS);
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return PyLong_FromLong(num_code_object_destroyed_events[watcher_id_l]);
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}
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static PyObject *
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allocate_too_many_code_watchers(PyObject *self, PyObject *args)
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{
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int watcher_ids[CODE_MAX_WATCHERS + 1];
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int num_watchers = 0;
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for (unsigned long i = 0; i < sizeof(watcher_ids) / sizeof(int); i++) {
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int watcher_id = PyCode_AddWatcher(noop_code_event_handler);
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if (watcher_id == -1) {
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break;
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}
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watcher_ids[i] = watcher_id;
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num_watchers++;
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}
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PyObject *exc = PyErr_GetRaisedException();
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for (int i = 0; i < num_watchers; i++) {
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if (PyCode_ClearWatcher(watcher_ids[i]) < 0) {
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PyErr_WriteUnraisable(Py_None);
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break;
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}
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}
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if (exc) {
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PyErr_SetRaisedException(exc);
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return NULL;
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}
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else if (PyErr_Occurred()) {
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return NULL;
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}
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Py_RETURN_NONE;
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}
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// Test function watchers
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#define NUM_TEST_FUNC_WATCHERS 2
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static PyObject *pyfunc_watchers[NUM_TEST_FUNC_WATCHERS];
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static int func_watcher_ids[NUM_TEST_FUNC_WATCHERS] = {-1, -1};
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static PyObject *
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get_id(PyObject *obj)
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{
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PyObject *builtins = PyEval_GetBuiltins(); // borrowed ref.
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if (builtins == NULL) {
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return NULL;
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}
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PyObject *id_str = PyUnicode_FromString("id");
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if (id_str == NULL) {
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return NULL;
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}
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PyObject *id_func = PyObject_GetItem(builtins, id_str);
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Py_DECREF(id_str);
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if (id_func == NULL) {
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return NULL;
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}
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PyObject *stack[] = {obj};
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PyObject *id = PyObject_Vectorcall(id_func, stack, 1, NULL);
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Py_DECREF(id_func);
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return id;
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}
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static int
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call_pyfunc_watcher(PyObject *watcher, PyFunction_WatchEvent event,
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PyFunctionObject *func, PyObject *new_value)
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{
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PyObject *event_obj = PyLong_FromLong(event);
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if (event_obj == NULL) {
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return -1;
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}
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if (new_value == NULL) {
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new_value = Py_None;
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}
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Py_INCREF(new_value);
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PyObject *func_or_id = NULL;
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if (event == PyFunction_EVENT_DESTROY) {
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/* Don't expose a function that's about to be destroyed to managed code */
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func_or_id = get_id((PyObject *) func);
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if (func_or_id == NULL) {
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Py_DECREF(event_obj);
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Py_DECREF(new_value);
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return -1;
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}
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}
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else {
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Py_INCREF(func);
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func_or_id = (PyObject *) func;
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}
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PyObject *stack[] = {event_obj, func_or_id, new_value};
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PyObject *res = PyObject_Vectorcall(watcher, stack, 3, NULL);
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int st = (res == NULL) ? -1 : 0;
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Py_XDECREF(res);
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Py_DECREF(new_value);
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Py_DECREF(event_obj);
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Py_DECREF(func_or_id);
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return st;
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}
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static int
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first_func_watcher_callback(PyFunction_WatchEvent event, PyFunctionObject *func,
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PyObject *new_value)
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{
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return call_pyfunc_watcher(pyfunc_watchers[0], event, func, new_value);
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}
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static int
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second_func_watcher_callback(PyFunction_WatchEvent event,
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PyFunctionObject *func, PyObject *new_value)
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{
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return call_pyfunc_watcher(pyfunc_watchers[1], event, func, new_value);
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}
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static PyFunction_WatchCallback func_watcher_callbacks[NUM_TEST_FUNC_WATCHERS] = {
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first_func_watcher_callback,
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second_func_watcher_callback
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};
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static int
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add_func_event(PyObject *module, const char *name, PyFunction_WatchEvent event)
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{
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PyObject *value = PyLong_FromLong(event);
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|
if (value == NULL) {
|
|
return -1;
|
|
}
|
|
int ok = PyModule_AddObjectRef(module, name, value);
|
|
Py_DECREF(value);
|
|
return ok;
|
|
}
|
|
|
|
static PyObject *
|
|
add_func_watcher(PyObject *self, PyObject *func)
|
|
{
|
|
if (!PyFunction_Check(func)) {
|
|
PyErr_SetString(PyExc_TypeError, "'func' must be a function");
|
|
return NULL;
|
|
}
|
|
int idx = -1;
|
|
for (int i = 0; i < NUM_TEST_FUNC_WATCHERS; i++) {
|
|
if (func_watcher_ids[i] == -1) {
|
|
idx = i;
|
|
break;
|
|
}
|
|
}
|
|
if (idx == -1) {
|
|
PyErr_SetString(PyExc_RuntimeError, "no free test watchers");
|
|
return NULL;
|
|
}
|
|
func_watcher_ids[idx] = PyFunction_AddWatcher(func_watcher_callbacks[idx]);
|
|
if (func_watcher_ids[idx] < 0) {
|
|
return NULL;
|
|
}
|
|
pyfunc_watchers[idx] = Py_NewRef(func);
|
|
PyObject *result = PyLong_FromLong(func_watcher_ids[idx]);
|
|
if (result == NULL) {
|
|
return NULL;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static PyObject *
|
|
clear_func_watcher(PyObject *self, PyObject *watcher_id_obj)
|
|
{
|
|
long watcher_id = PyLong_AsLong(watcher_id_obj);
|
|
if ((watcher_id < INT_MIN) || (watcher_id > INT_MAX)) {
|
|
PyErr_SetString(PyExc_ValueError, "invalid watcher ID");
|
|
return NULL;
|
|
}
|
|
int wid = (int) watcher_id;
|
|
if (PyFunction_ClearWatcher(wid) < 0) {
|
|
return NULL;
|
|
}
|
|
int idx = -1;
|
|
for (int i = 0; i < NUM_TEST_FUNC_WATCHERS; i++) {
|
|
if (func_watcher_ids[i] == wid) {
|
|
idx = i;
|
|
break;
|
|
}
|
|
}
|
|
assert(idx != -1);
|
|
Py_CLEAR(pyfunc_watchers[idx]);
|
|
func_watcher_ids[idx] = -1;
|
|
Py_RETURN_NONE;
|
|
}
|
|
|
|
static int
|
|
noop_func_event_handler(PyFunction_WatchEvent event, PyFunctionObject *func,
|
|
PyObject *new_value)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static PyObject *
|
|
allocate_too_many_func_watchers(PyObject *self, PyObject *args)
|
|
{
|
|
int watcher_ids[FUNC_MAX_WATCHERS + 1];
|
|
int num_watchers = 0;
|
|
for (unsigned long i = 0; i < sizeof(watcher_ids) / sizeof(int); i++) {
|
|
int watcher_id = PyFunction_AddWatcher(noop_func_event_handler);
|
|
if (watcher_id == -1) {
|
|
break;
|
|
}
|
|
watcher_ids[i] = watcher_id;
|
|
num_watchers++;
|
|
}
|
|
PyObject *exc = PyErr_GetRaisedException();
|
|
for (int i = 0; i < num_watchers; i++) {
|
|
if (PyFunction_ClearWatcher(watcher_ids[i]) < 0) {
|
|
PyErr_WriteUnraisable(Py_None);
|
|
break;
|
|
}
|
|
}
|
|
if (exc) {
|
|
PyErr_SetRaisedException(exc);
|
|
return NULL;
|
|
}
|
|
else if (PyErr_Occurred()) {
|
|
return NULL;
|
|
}
|
|
Py_RETURN_NONE;
|
|
}
|
|
|
|
/*[clinic input]
|
|
_testcapi.set_func_defaults_via_capi
|
|
func: object
|
|
defaults: object
|
|
/
|
|
[clinic start generated code]*/
|
|
|
|
static PyObject *
|
|
_testcapi_set_func_defaults_via_capi_impl(PyObject *module, PyObject *func,
|
|
PyObject *defaults)
|
|
/*[clinic end generated code: output=caf0cb39db31ac24 input=e04a8508ca9d42fc]*/
|
|
{
|
|
if (PyFunction_SetDefaults(func, defaults) < 0) {
|
|
return NULL;
|
|
}
|
|
Py_RETURN_NONE;
|
|
}
|
|
|
|
/*[clinic input]
|
|
_testcapi.set_func_kwdefaults_via_capi = _testcapi.set_func_defaults_via_capi
|
|
[clinic start generated code]*/
|
|
|
|
static PyObject *
|
|
_testcapi_set_func_kwdefaults_via_capi_impl(PyObject *module, PyObject *func,
|
|
PyObject *defaults)
|
|
/*[clinic end generated code: output=9ed3b08177025070 input=f3cd1ca3c18de8ce]*/
|
|
{
|
|
if (PyFunction_SetKwDefaults(func, defaults) < 0) {
|
|
return NULL;
|
|
}
|
|
Py_RETURN_NONE;
|
|
}
|
|
|
|
static PyMethodDef test_methods[] = {
|
|
// Dict watchers.
|
|
{"add_dict_watcher", add_dict_watcher, METH_O, NULL},
|
|
{"clear_dict_watcher", clear_dict_watcher, METH_O, NULL},
|
|
_TESTCAPI_WATCH_DICT_METHODDEF
|
|
_TESTCAPI_UNWATCH_DICT_METHODDEF
|
|
{"get_dict_watcher_events",
|
|
(PyCFunction) get_dict_watcher_events, METH_NOARGS, NULL},
|
|
|
|
// Type watchers.
|
|
{"add_type_watcher", add_type_watcher, METH_O, NULL},
|
|
{"clear_type_watcher", clear_type_watcher, METH_O, NULL},
|
|
_TESTCAPI_WATCH_TYPE_METHODDEF
|
|
_TESTCAPI_UNWATCH_TYPE_METHODDEF
|
|
{"get_type_modified_events",
|
|
(PyCFunction) get_type_modified_events, METH_NOARGS, NULL},
|
|
|
|
// Code object watchers.
|
|
{"add_code_watcher", add_code_watcher, METH_O, NULL},
|
|
{"clear_code_watcher", clear_code_watcher, METH_O, NULL},
|
|
{"get_code_watcher_num_created_events",
|
|
get_code_watcher_num_created_events, METH_O, NULL},
|
|
{"get_code_watcher_num_destroyed_events",
|
|
get_code_watcher_num_destroyed_events, METH_O, NULL},
|
|
{"allocate_too_many_code_watchers",
|
|
(PyCFunction) allocate_too_many_code_watchers, METH_NOARGS, NULL},
|
|
|
|
// Function watchers.
|
|
{"add_func_watcher", add_func_watcher, METH_O, NULL},
|
|
{"clear_func_watcher", clear_func_watcher, METH_O, NULL},
|
|
_TESTCAPI_SET_FUNC_DEFAULTS_VIA_CAPI_METHODDEF
|
|
_TESTCAPI_SET_FUNC_KWDEFAULTS_VIA_CAPI_METHODDEF
|
|
{"allocate_too_many_func_watchers", allocate_too_many_func_watchers,
|
|
METH_NOARGS, NULL},
|
|
{NULL},
|
|
};
|
|
|
|
int
|
|
_PyTestCapi_Init_Watchers(PyObject *mod)
|
|
{
|
|
if (PyModule_AddFunctions(mod, test_methods) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
/* Expose each event as an attribute on the module */
|
|
#define ADD_EVENT(event) \
|
|
if (add_func_event(mod, "PYFUNC_EVENT_" #event, \
|
|
PyFunction_EVENT_##event)) { \
|
|
return -1; \
|
|
}
|
|
PY_FOREACH_FUNC_EVENT(ADD_EVENT);
|
|
#undef ADD_EVENT
|
|
|
|
return 0;
|
|
}
|