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| author | Mark Shannon <mark@hotpy.org> | 2022-11-10 12:34:57 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-11-10 12:34:57 (GMT) |
| commit | 1e197e63e21f77b102ff2601a549dda4b6439455 (patch) | |
| tree | 5d8524091404607c838bb9a0ea168c8d9c28fd6a /Misc/NEWS.d | |
| parent | dbf2faf579b4094387d65ee41f049456ca67c446 (diff) | |
| download | cpython-1e197e63e21f77b102ff2601a549dda4b6439455.zip cpython-1e197e63e21f77b102ff2601a549dda4b6439455.tar.gz cpython-1e197e63e21f77b102ff2601a549dda4b6439455.tar.bz2 | |
GH-96421: Insert shim frame on entry to interpreter (GH-96319)
* Adds EXIT_INTERPRETER instruction to exit PyEval_EvalDefault()
* Simplifies RETURN_VALUE, YIELD_VALUE and RETURN_GENERATOR instructions as they no longer need to check for entry frames.
Diffstat (limited to 'Misc/NEWS.d')
| -rw-r--r-- | Misc/NEWS.d/next/Core and Builtins/2022-10-19-15-59-08.gh-issue-96421.e22y3r.rst | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Misc/NEWS.d/next/Core and Builtins/2022-10-19-15-59-08.gh-issue-96421.e22y3r.rst b/Misc/NEWS.d/next/Core and Builtins/2022-10-19-15-59-08.gh-issue-96421.e22y3r.rst new file mode 100644 index 0000000..857ce7d --- /dev/null +++ b/Misc/NEWS.d/next/Core and Builtins/2022-10-19-15-59-08.gh-issue-96421.e22y3r.rst @@ -0,0 +1,13 @@ +When calling into Python code from C code, through :c:func:`PyEval_EvalFrameEx` or +a related C-API function, a shim frame in inserted into the call stack. +This occurs in the ``_PyEval_EvalFrameDefault()`` function. +The extra frame should be invisible to all Python and most C extensions, +but out-of-process profilers and debuggers need to be aware of it. +These shim frames can be detected by checking +``frame->owner == FRAME_OWNED_BY_CSTACK``. + +Extensions implementing their own interpreters using PEP 523 need to be +aware of this shim frame and the changes to the semantics of +:opcode:`RETURN_VALUE`, :opcode:`YIELD_VALUE`, and :opcode:`RETURN_GENERATOR`, +which now clear the frame. + |