GH-126910: Make _Py_get_machine_stack_pointer return the actual stack pointer

[markshannon]

(or something close it), but not the frame pointer

• Make _Py_ReachedRecursionLimit inline again
• Remove _Py_MakeRecCheck replacing its use with _Py_ReachedRecursionLimit
• Move the check for C stack swtiching into _Py_CheckRecursiveCall

This is a rebase of #147945 which was reverted due to a non-reproducable buildbot failure.

• Issue: Supporting stack unwinding in the JIT compiler #126910

[read-the-docs-community]

Documentation build overview

📚 cpython-previews | 🛠️ Build #32465483 | 📁 Comparing 01fe604 against main (d4eee16)

  🔍 Preview build  

6 files changed · ± 6 modified

± Modified

• contents.html
• download.html
• library/asyncio-task.html
• library/functions.html
• whatsnew/3.15.html
• whatsnew/changelog.html

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @markshannon for commit 01fe604 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F149103%2Fmerge

If you want to schedule another build, you need to add the 🔨 test-with-buildbots label again.

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @markshannon for commit 98073f5 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F149103%2Fmerge

If you want to schedule another build, you need to add the 🔨 test-with-buildbots label again.

[markshannon]

@pablogsal
Can you tell what is going on with the buildbot/AMD64 CentOS9 NoGIL PR buildbot?
The test_python_calls_appear_in_the_stack_if_perf_activated test is failing.
Interstingly py_trampoline_evaluator appears 1000s of times in the test output.
Isn't that supposed to show as the Python function in perf?

[pablogsal]

@pablogsal

Can you tell what is going on with the buildbot/AMD64 CentOS9 NoGIL PR buildbot?

The test_python_calls_appear_in_the_stack_if_perf_activated test is failing.

Interstingly py_trampoline_evaluator appears 1000s of times in the test output.

Isn't that supposed to show as the Python function in perf?

Perf should add the Python function below that one, yes. I need time to investigate I will try to do it this week but I am a bit overwhelmed with pending things. I will try to take a look as soon as possible.