* Speed up PyObject_CallMethod via _PyObject_GetMethod
PyObject_CallMethod (and _PyObject_CallMethod, PyEval_CallMethod,
_PyObject_CallMethodId and the _SizeT variant) resolved the method with
PyObject_GetAttr, which builds a temporary bound-method object on every call,
then called it.
Resolve the method with _PyObject_GetMethod instead (the same lookup the
interpreter uses for obj.name(...)) and call it directly via
_PyObject_VectorcallPrepend, skipping the bound-method allocation. Behaviour
is unchanged: same attribute semantics, same "attribute of type ... is not
callable" error, and the historical
PyObject_CallMethod(o, m, "O", tuple) -> o.m(*tuple) unpacking.
The shared helper callmethod() and _PyObject_CallMethodFormat() are no longer
needed: their only caller (traceback.c) now uses PyObject_CallFunction, so both
are removed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* Use _PyObject_GetMethodStackRef so method calls scale in free-threading
Resolve the method in callmethod_va() via _PyObject_GetMethodStackRef()
instead of _PyObject_GetMethod(). The StackRef variant returns the method
as a deferred reference, avoiding the per-call atomic refcount on the
shared method object that otherwise serializes threads in the
free-threaded build.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* rename to callmethod
* review comments
* review comments
---------
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: Kumar Aditya <kumaraditya@python.org>
Co-authored-by: Inada Naoki <songofacandy@gmail.com>
The value of a @setter is now a parameter, which can use a converter,
and a @getter can define a return converter. Declaring the value is
optional.
The accessors of an attribute are now collected in a Property, so the
entry of PyGetSetDef is identified by the Python name instead of the C
basename, and is composed without the help of the preprocessor unless
some accessor is compiled conditionally.
Fix generating an accessor in a preprocessor conditional block.
Reject the accessors of the same attribute with different C basenames and
the same accessor defined twice.
Reject deletion of the attribute, which crashed the setter, unless the new
directive @deleter is applied to it.
Add a keyword-only `max_threads` argument to `dump_traceback()` and
`dump_traceback_later()`, defaulting to 100 to preserve existing
behavior. Allows server processes with many worker threads to dump
beyond the historical 100-thread cap (previously a hardcoded
`MAX_NTHREADS = 100` in `Python/traceback.c`).
The cap matters in practice: tstates are prepended to the
PyInterpreterState linked list, so the dump walks newest-first. With
more than 100 threads alive, the main thread (oldest, at the tail) is
silently elided from watchdog dumps -- exactly the thread that's
usually wanted.
The hardcoded value is moved to a new internal macro
`_Py_TRACEBACK_MAX_NTHREADS` in `pycore_traceback.h` so the in-tree
fatal-signal callers all reference one source of truth.
faulthandler now detects if a frame or a code object is invalid or
freed.
Add helper functions:
* _PyCode_SafeAddr2Line()
* _PyFrame_SafeGetCode()
* _PyFrame_SafeGetLasti()
_PyMem_IsPtrFreed() now detects pointers in [-0xff, 0xff] range
as freed.
Add _Py_DumpWideString() function to dump a wide string as ASCII. It
supports surrogate pairs.
Replace _Py_EncodeLocaleRaw() with _Py_DumpWideString()
in write_thread_name().
Call backtrace() once when installing the signal handler to ensure that
libgcc is dynamically loaded outside the signal handler.
This fixes a "signal-unsafe call inside of a signal" TSan error from
test_faulthandler.test_enable_fd.
The use of PySys_GetObject() and _PySys_GetAttr(), which return a borrowed
reference, has been replaced by using one of the following functions, which
return a strong reference and distinguish a missing attribute from an error:
_PySys_GetOptionalAttr(), _PySys_GetOptionalAttrString(),
_PySys_GetRequiredAttr(), and _PySys_GetRequiredAttrString().
* Remove unused <locale.h> includes.
* Remove unused <fcntl.h> include in traceback.h.
* Remove redundant <assert.h> and <stddef.h> includes. They are already
included by "Python.h".
* Remove <object.h> include in faulthandler.c. Python.h already includes it.
* Add missing <stdbool.h> in pycore_pythread.h if HAVE_PTHREAD_STUBS
is defined.
* Fix also warnings in pthread_stubs.h: don't redefine macros if they
are already defined, like the __NEED_pthread_t macro.
Move private functions to the internal C API (pycore_sysmodule.h):
* _PySys_GetAttr()
* _PySys_GetSizeOf()
No longer export most of these functions.
Fix also a typo in Include/cpython/optimizer.h: add a missing space.
* Add table describing possible executable classes for out-of-process debuggers.
* Remove shim code object creation code as it is no longer needed.
* Make lltrace a bit more robust w.r.t. non-standard frames.
