Move new vector private declarations to the internal C API

[vstinner]

BPO	37194
Nosy	@vstinner, @jdemeyer
PRs	bpo-37194: Add a new public PyObject_CallNoArgs() function #13890 bpo-37194: Complete PyObject_CallXXX() docs #14156 [3.8] bpo-37194: Complete PyObject_CallXXX() docs (GH-14156) #14157 [3.7] bpo-37194: Complete PyObject_CallXXX() docs (GH-14156) #14158 bpo-37194: Add PyObject_CallNoArgs() rationale #14159 bpo-39245: Make Vectorcall public #17893 Add symbols of the stable ABI to python3dll.c #23598 [3.9] bpo-42415: Add symbols of the stable ABI to python3dll.c (GH-23598) #23801
Files	stack_overflow-4.py testcapi_call_no_args.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-06-17.13:09:16.423>
created_at = <Date 2019-06-07.11:54:00.354>
labels = ['interpreter-core', '3.8', '3.9']
title = 'Move new vector private declarations to the internal C API'
updated_at = <Date 2020-12-16.21:41:55.141>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2020-12-16.21:41:55.141>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2019-06-17.13:09:16.423>
closer = 'vstinner'
components = ['Interpreter Core']
creation = <Date 2019-06-07.11:54:00.354>
creator = 'vstinner'
dependencies = []
files = ['48400', '48401']
hgrepos = []
issue_num = 37194
keywords = ['patch']
message_count = 12.0
messages = ['344927', '344929', '344936', '344960', '345852', '345854', '345855', '345857', '345858', '345862', '383166', '383208']
nosy_count = 2.0
nosy_names = ['vstinner', 'jdemeyer']
pr_nums = ['13890', '14156', '14157', '14158', '14159', '17893', '23598', '23801']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue37194'
versions = ['Python 3.8', 'Python 3.9']

[vstinner]

bpo-37191: the new vector APIs declare "static inline" functions which are no C89 compatible and so cause compilation issues on pygobject3, python-dbus, xen (for example).

I propose to move the new *private* declarations to the internal C API.

I started to work on an application. The blocker issue is _PyObject_CallNoArg() which is now commonly used in CPython code base for best performances. It is used the _testcapi which must *not* be compiled with the internal C API.

So I suggest to first add a new public PyObject_CallNoArg() function. It would be different than _PyObject_CallNoArg() static inline function: PyObject_CallNoArg() would be a regular function and so fit better with ABI issues.

[jdemeyer]

I propose to move the new *private* declarations to the internal C API.

Some of those functions (in particular _PyObject_Vectorcall) are expected to become public in 3.9. They are only private for now since the API is provisional.

[vstinner]

I used testcapi_call_no_args.patch and stack_overflow-4.py to measure the stack consumption of PyObject_CallNoArgs() and PyObject_CallFunctionObjArgs() for PR 13890.

[vstinner]

Oh, I used the wrong bpo number for this change:

New changeset 740a84d by Victor Stinner in branch 'master':
bpo-37191: Move TestPEP590 from test_capi to test_call (GH-13892)
740a84d

New changeset 5effd10 by Miss Islington (bot) in branch '3.8':
bpo-37191: Move TestPEP590 from test_capi to test_call (GH-13892)
5effd10

[vstinner]

New changeset 2ff58a2 by Victor Stinner in branch 'master':
bpo-37194: Add a new public PyObject_CallNoArgs() function (GH-13890)
2ff58a2

[vstinner]

New changeset 1ce2656 by Victor Stinner in branch 'master':
bpo-37194: Complete PyObject_CallXXX() docs (GH-14156)
1ce2656

[vstinner]

bpo-37191: the new vector APIs declare "static inline" functions which are no C89 compatible and so cause compilation issues on pygobject3, python-dbus, xen (for example).

bpo-37191 have been fixed, so this issue can now be closed.

[vstinner]

New changeset ac4202e by Victor Stinner in branch '3.7':
bpo-37194: Complete PyObject_CallXXX() docs (GH-14156) (GH-14158)
ac4202e

[vstinner]

New changeset 71031cf by Victor Stinner in branch '3.8':
bpo-37194: Complete PyObject_CallXXX() docs (GH-14156) (GH-14157)
71031cf

[vstinner]

New changeset 5352cc4 by Victor Stinner in branch 'master':
bpo-37194: Add PyObject_CallNoArgs() rationale (GH-14159)
5352cc4