Python code doesn't like to run without `__builtins__`, so adding them
if missing seems to be a good idea. Also that's what CPython >3.10 does.
See https://github.com/python/cpython/pull/24564Resolves#3370
These are new and part of the stable API as of v3.12.0a6.
PyErr_Fetch(), PyErr_Restore(), and PyErr_NormalizeException()
were simultaneously deprecated in favor of these.
python/cpython@feec49c407
3203: support ordering magic methods for `#[pyclass]` r=adamreichold a=davidhewitt
Closes#2089
This adds `__lt__`, `__le__`, `__eq__`, `__ne__`, `__gt__`, and `__ge__` as per the Python implementations of what we call `__richcmp__`.
There's a UI test confirming that the user cannot implement split forms and `__richcmp__` simultaneously.
There's also a benchmark comparing implementing these split methods against using `__richcmp__`. I couldn't see a meaningful performance difference, so I'm tempted to deprecate `__richcmp__`, given that's not a magic method which exists in Python. Potentially we can provide options such as the opt-in `#[pyclass(eq, ord)]` to avoid boilerplate for people who don't want to implement six different methods.
Co-authored-by: David Hewitt <1939362+davidhewitt@users.noreply.github.com>
3198: Add abi3 + num_bigint conversion r=davidhewitt a=youknowone
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Fix#3196
Co-authored-by: Jeong YunWon <jeong@youknowone.org>
Python classes that were not `complex` but implemented the `__complex__`
magic would have that method called via `PyComplex_AsCComplex` when
running against the full API, but the limited-API version
`PyComplex_RealAsDouble` does not attempt this conversion. If the input
object is not already complex, we can call the magic before proceeding.
3168: Do not apply deferred ref count updates and prevent the GIL from being acquired inside of __traverse__ implementations. r=davidhewitt a=adamreichold
Closes#2301Closes#3165
3176: Prevent dropping unsendable classes on other threads. r=davidhewitt a=adamreichold
Continuing the discussed from https://github.com/PyO3/pyo3/pull/3169#issuecomment-1556571504 and https://github.com/PyO3/pyo3/pull/3169#issuecomment-1556661723:
We already have checks in place to avoid borrowing these classes on other threads but it was still possible to send them to another thread and drop them there (while holding the GIL).
This change avoids running the `Drop` implementation in such a case even though Python will still free the underlying memory. This might leak resources owned by the object, but it avoids undefined behaviour due to access the unsendable type from another thread.
This does assume that the object was not unsafely integrated into an intrusive data structures which still point to the now freed memory. In that case, the only recourse would be to abort the process as freeing the memory is unavoidable when the tp_dealloc slot is called. (And moving it elsewhere into a new allocation would still break any existing pointers.)
Co-authored-by: Adam Reichold <adam.reichold@t-online.de>
We already have checks in place to avoid borrowing these classes on other
threads but it was still possible to send them to another thread and drop them
there (while holding the GIL).
This change avoids running the `Drop` implementation in such a case even though
Python will still free the underlying memory. This might leak resources owned by
the object, but it avoids undefined behaviour due to access the unsendable type
from another thread.
This does assume that the object was not unsafely integrated into an intrusive
data structures which still point to the now freed memory. In that case, the
only recourse would be to abort the process as freeing the memory is unavoidable
when the tp_dealloc slot is called. (And moving it elsewhere into a new
allocation would still break any existing pointers.)
