* Doc/c-api/memory.rst: extend --without-pymalloc doc with ASan information
This commit extends the documentation for disabling pymalloc with the `--without-pymalloc` flag regarding why it is worth to use it when enabling AddressSanitizer for Python build (which is done, e.g., in CPython's CI builds).
I have tested the CPython latest main build with both ASan and pymalloc enabled and it seems to work just fine. I did run the `python -m test` suite which didn't uncover any ASan crashes (though, it detected some memory leaks, which I believe are irrelevant here).
I have discussed ASan and this flag with @encukou on the CPython Core sprint on EuroPython 2025. We initially thought that the `--without-pymalloc` flag is needed for ASan builds due to the fact pymalloc must hit the begining of page when determining if the memory to be freed comes from pymalloc or was allocated by the system malloc. In other words, we thought, that ASan would crash CPython during free of big objects (allocated by system malloc). It may be that this was the case in the past, but it is not the case anymore as the `address_in_range` function used by pymalloc is annotated to be skipped from the ASan instrumentation.
This code can be seen here:
https://github.com/python/cpython/blob/acefb978dcb5dd554e3c49a3015ee5c2ad6bfda1/Objects/obmalloc.c#L2096-L2110
While the annotation macro is defined here:
https://github.com/python/cpython/blob/acefb978dcb5dd554e3c49a3015ee5c2ad6bfda1/Include/pyport.h#L582-L598
And the corresponding attribute is documented in:
* for gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-no_005fsanitize_005faddress-function-attribute
* for clang: https://clang.llvm.org/docs/AttributeReference.html#no-sanitize-address-no-address-safety-analysis
* Update Doc/c-api/memory.rst
* Improve --with-address-sanitizer and pymalloc docs
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Co-authored-by: Petr Viktorin <encukou@gmail.com>
The iOS testbed now treats the app_packages folder as a site folder. This ensures it is
on the path, but also ensures any .pth files are processed on app startup.
Remove `experimental` qualification for free-threading in the document text. Note that images included in the document will be updated later in the release cycle.
Modifies the environment handling and execution arguments of the Android management
script to support the compilation of third-party binaries, and the use of the testbed to
invoke third-party test code.
Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
Co-authored-by: Russell Keith-Magee <russell@keith-magee.com>
This change to the core CPython repo:
* Adds PyManager support to PC/layout
* Adds a warning message to the legacy py.exe if subcommands are invoked
* Add deprecation message to traditional installer
* Updates using/windows docs
OpenSSL 3.4.1 mnemonics are not compatible with OpenSSL 3.4.0 ones since
they were renumbered [1, 2]. Consequently, `_ssl_data_34.h` is renamed to
`_ssl_data_340.h` and `_ssl_data_34.h` now contains OpenSSL 3.4.1 mnemonics.
We also refine the mnemonics that are selected, discarding those that are
mnemonic-like but should not be used as such. More precisely, we remove
the ERR_LIB_MASK and ERR_LIB_OFFSET entries from OpenSSL 1.1.1 data.
[1]: https://github.com/openssl/openssl/issues/26316
[2]: https://github.com/openssl/openssl/issues/26388
Make `warnings.catch_warnings()` use a context variable for holding
the warning filtering state if the `sys.flags.context_aware_warnings`
flag is set to true. This makes using the context manager thread-safe in
multi-threaded programs.
Add the `sys.flags.thread_inherit_context` flag. If true, starting a new
thread with `threading.Thread` will use a copy of the context
from the caller of `Thread.start()`.
Both these flags are set to true by default for the free-threaded build
and false for the default build.
Move the Python implementation of warnings.py into _py_warnings.py.
Make _contextvars a builtin module.
Co-authored-by: Kumar Aditya <kumaraditya@python.org>
Adds a `use_system_log` config item to enable stdout/stderr redirection for
Apple platforms. This log streaming is then used by a new iOS test runner
script, allowing the display of test suite output at runtime. The iOS test
runner script can be used by any Python project, not just the CPython test
suite.
This unifies the code for nodejs and the code for the browser. After this
commit, the browser example doesn't work; this will be fixed in a
subsequent update.
Add an entry for the ``--enable-experimental-jit`` option in ``Doc/using/configure.rst``.
This was added as an experimental option in CPython 3.13.
Possible values for it:
* `no` - don't build the JIT.
* `yes` - build the JIT.
* `yes-off` - build the JIT but disable it by default.
* `interpreter` - don't build the JIT but enable tier 2 interpreter instead.
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
Adam Turner