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Victor Stinner b11a384dc7
gh-98724: Fix Py_CLEAR() macro side effects (#99100) (#100070) 
The Py_CLEAR(), Py_SETREF() and Py_XSETREF() macros now only evaluate
their arguments once. If an argument has side effects, these side
effects are no longer duplicated.

Use temporary variables to avoid duplicating side effects of macro
arguments. If available, use _Py_TYPEOF() to avoid type punning.
Otherwise, use memcpy() for the assignment to prevent a
miscompilation with strict aliasing caused by type punning.

Add _Py_TYPEOF() macro: __typeof__() on GCC and clang.

Add test_py_clear() and test_py_setref() unit tests to _testcapi.
2022-12-07 15:22:38 +01:00
..
cpython gh-98724: Fix Py_CLEAR() macro side effects (#99100) (#100070) 2022-12-07 15:22:38 +01:00
internal no-issue: Fix typo in pycore_object.h (gh-99994) 2022-12-05 14:42:38 +09:00
abstract.h gh-98586: Add vector call APIs to the Limited API (GH-98587) 2022-10-27 11:45:42 +02:00
bltinmodule.h these builtins have to be initialized 2009-05-09 18:10:51 +00:00
boolobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
bytearrayobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
bytesobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
ceval.h gh-87347: Add parenthesis around macro arguments (#93915) 2022-06-20 16:04:52 +02:00
codecs.h bpo-41842: Add codecs.unregister() function (GH-22360) 2020-09-28 23:41:11 +02:00
compile.h bpo-35134: Add include/cpython/compile.h (GH-24922) 2021-03-22 09:32:11 +01:00
complexobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
datetime.h gh-87347: Add parenthesis around macro arguments (#93915) 2022-06-20 16:04:52 +02:00
descrobject.h gh-47146: Soft-deprecate structmember.h, expose its contents via Python.h (GH-99014) 2022-11-22 08:25:43 +01:00
dictobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
dynamic_annotations.h gh-96959: Update HTTP links which are redirected to HTTPS (GH-96961) 2022-09-24 14:38:53 +03:00
enumobject.h Implement and apply PEP 322, reverse iteration 2003-11-06 14:06:48 +00:00
errcode.h bpo-46521: Fix codeop to use a new partial-input mode of the parser (GH-31010) 2022-02-08 11:54:37 +00:00
exports.h bpo-11410: Standardize and use symbol visibility attributes across POSIX and Windows. (GH-16347) 2019-10-15 08:26:12 +01:00
fileobject.h gh-77782: Deprecate global configuration variable (#93943) 2022-06-17 16:12:00 +02:00
fileutils.h bpo-45434: Remove useless space in includes (GH-28963) 2021-10-15 01:50:04 +02:00
floatobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
frameobject.h bpo-45434: Remove useless space in includes (GH-28963) 2021-10-15 01:50:04 +02:00
genericaliasobject.h bpo-44654: Refactor and clean up the union type implementation (GH-27196) 2021-07-17 22:44:10 +03:00
import.h gh-87347: Add parenthesis around macro arguments (#93915) 2022-06-20 16:04:52 +02:00
intrcheck.h bpo-41713: Remove PyOS_InitInterrupts() function (GH-23342) 2020-11-17 16:22:23 +01:00
iterobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
listobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
longobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
marshal.h bpo-45474: Exclude all of marshal.h if Py_LIMITED_API is defined (GH-29061) 2021-10-20 02:32:14 -07:00
memoryobject.h gh-79315: Add Include/cpython/memoryobject.h header (#99723) 2022-11-23 15:44:42 +01:00
methodobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
modsupport.h gh-87347: Add parenthesis around macro arguments (#93915) 2022-06-20 16:04:52 +02:00
moduleobject.h gh-81057: Move the Extension Modules Cache to _PyRuntimeState (gh-99355) 2022-11-11 14:16:28 -07:00
object.h gh-98724: Fix Py_CLEAR() macro side effects (#99100) (#100070) 2022-12-07 15:22:38 +01:00
objimpl.h gh-87347: Fix PyObject_NEW() regression (#94234) 2022-06-26 12:40:17 +02:00
opcode.h GH-98686: Get rid of BINARY_OP_GENERIC and COMPARE_OP_GENERIC (GH-99399) 2022-11-17 11:36:57 -08:00
osdefs.h bpo-31904: Add cross-build support for VxWorks RTOS (GH-11968) 2019-02-27 12:09:28 +01:00
osmodule.h Issue #29058: All stable API extensions added after Python 3.2 are now 2016-12-27 14:57:39 +02:00
patchlevel.h Post 3.12.0a3 2022-12-06 22:20:28 +01:00
py_curses.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
pybuffer.h gh-98410: move getbufferproc and releasebufferproc to buffer.h (#31158) 2022-10-31 15:01:32 +01:00
pycapsule.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
pydtrace.d bpo-36842: Implement PEP 578 (GH-12613) 2019-05-23 08:45:22 -07:00
pydtrace.h bpo-36842: Implement PEP 578 (GH-12613) 2019-05-23 08:45:22 -07:00
pyerrors.h gh-87347: Add parenthesis around macro arguments (#93915) 2022-06-20 16:04:52 +02:00
pyexpat.h bpo-34623: Use XML_SetHashSalt in _elementtree (GH-9146) 2018-09-18 05:38:58 -07:00
pyframe.h gh-93937, C API: Move PyFrame_GetBack() to Python.h (#93938) 2022-06-19 12:02:33 +02:00
pyhash.h bpo-29410: Change the default hash algorithm to SipHash13. (GH-28752) 2021-10-10 17:29:46 +09:00
pylifecycle.h bpo-43931: Export Python version as API data (GH-25577) 2021-12-09 17:52:05 -08:00
pymacconfig.h gh-93202: Always use %zd printf formatter (#93201) 2022-05-25 14:21:36 +02:00
pymacro.h gh-91731: Don't define 'static_assert' in C++11 where is a keyword to avoid UB (GH-93700) 2022-06-13 15:49:08 +01:00
pymath.h bpo-46656: Remove Py_NO_NAN macro (GH-31160) 2022-02-25 01:32:57 +01:00
pymem.h gh-87347: Add parenthesis around macro arguments (#93915) 2022-06-20 16:04:52 +02:00
pyport.h gh-98724: Fix Py_CLEAR() macro side effects (#99100) (#100070) 2022-12-07 15:22:38 +01:00
pystate.h bpo-45459: C API uses type names rather than structure names (GH-31528) 2022-02-24 17:51:59 +01:00
pystats.h GH-93841: Allow stats to be turned on and off, cleared and dumped at runtime. (GH-93843) 2022-06-21 15:40:54 +01:00
pystrcmp.h Merged revisions 59541-59561 via svnmerge from 2007-12-19 02:07:34 +00:00
pystrtod.h bpo-45995: add "z" format specifer to coerce negative 0 to zero (GH-30049) 2022-04-11 15:34:18 +01:00
Python.h bpo-35134: Remove the Include/code.h header file (GH-32385) 2022-04-07 02:29:52 +02:00
pythonrun.h Docs: Clarify availability of PyOS_CheckStack (GH-91816) 2022-04-22 12:44:43 +02:00
pythread.h bpo-42047: Add native thread ID for DragonFlyBSD (#22714) 2022-05-18 15:10:10 +02:00
pytypedefs.h bpo-45459: Fix PyModuleDef_Slot type in the limited C API (GH-31668) 2022-03-03 23:06:55 +01:00
rangeobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
README.rst bpo-43795: PEP 652 user documentation (GH-25668) 2021-05-11 07:04:33 -07:00
setobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
sliceobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
structmember.h gh-47146: Soft-deprecate structmember.h, expose its contents via Python.h (GH-99014) 2022-11-22 08:25:43 +01:00
structseq.h gh-87347: Add parenthesis around macro arguments (#93915) 2022-06-20 16:04:52 +02:00
sysmodule.h gh-88279: Deprecate PySys_SetArgvEx() (#92363) 2022-05-06 05:24:29 +02:00
traceback.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
tracemalloc.h bpo-35053: Define _PyTraceMalloc_NewReference in object.h (GH-10107) 2018-10-26 00:01:56 +02:00
tupleobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
typeslots.h bpo-45459: Add Py_buffer to limited API (GH-29991) 2022-02-02 07:03:10 -08:00
unicodeobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
warnings.h bpo-35134: Split warnings.h and weakrefobject.h (GH-29042) 2021-10-19 01:31:57 +02:00
weakrefobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00

README.rst 

The Python C API
================

The C API is divided into three sections:

1. ``Include/``: Limited API
2. ``Include/cpython/``: CPython implementation details
3. ``Include/internal/``: The internal API

Information on changing the C API is available `in the developer guide`_

.. _in the developer guide: https://devguide.python.org/c-api/