This adds a 16-bit inline cache entry to the conditional branch instructions POP_JUMP_IF_{FALSE,TRUE,NONE,NOT_NONE} and their instrumented variants, which is used to keep track of the branch direction.
Each time we encounter these instructions we shift the cache entry left by one and set the bottom bit to whether we jumped.
Then when it's time to translate such a branch to Tier 2 uops, we use the bit count from the cache entry to decided whether to continue translating the "didn't jump" branch or the "jumped" branch.
The counter is initialized to a pattern of alternating ones and zeros to avoid bias.
The .pyc file magic number is updated. There's a new test, some fixes for existing tests, and a few miscellaneous cleanups.
libregrtest now uses a separated file descriptor to write test result
as JSON. Previously, if a test wrote debug messages late around the
JSON, the main test process failed to parse JSON.
Rename TestResult.write_json() to TestResult.write_json_into().
worker_process() no longer writes an empty line at the end. There is
no need to separate test process output from the JSON output anymore,
since JSON is now written into a separated file descriptor.
create_worker_process() now always spawn the process with
close_fds=True.
Fix _thread.start_new_thread() race condition. If a thread is created
during Python finalization, the newly spawned thread now exits
immediately instead of trying to access freed memory and lead to a
crash.
thread_run() calls PyEval_AcquireThread() which checks if the thread
must exit. The problem was that tstate was dereferenced earlier in
_PyThreadState_Bind() which leads to a crash most of the time.
Move _PyThreadState_CheckConsistency() from thread_run() to
_PyThreadState_Bind().
Fix a race condition in concurrent.futures. When a process in the
process pool was terminated abruptly (while the future was running or
pending), close the connection write end. If the call queue is
blocked on sending bytes to a worker process, closing the connection
write end interrupts the send, so the queue can be closed.
Changes:
* _ExecutorManagerThread.terminate_broken() now closes
call_queue._writer.
* multiprocessing PipeConnection.close() now interrupts
WaitForMultipleObjects() in _send_bytes() by cancelling the
overlapped operation.
* Rename runtest_mp.py to run_workers.py
* Move exit_timeout() and temp_cwd() context managers from
Regrtest.main() to Regrtest.run_tests(). Actions like --list-tests
or --list-cases don't need these protections.
* Regrtest: remove selected and tests attributes. Pass 'selected' to
list_tests(), list_cases() and run_tests(). display_result() now
expects a TestTuple, instead of TestList.
* Rename setup_tests() to setup_process() and rename setup_support()
to setup_tests().
* Move _adjust_resource_limits() to utils and rename it to
adjust_rlimit_nofile().
* Move replace_stdout() to utils.
* Fix RunTests.verbose type: it's an int.
* Pass results, quiet and pgo to Logger constructor.
* Move display_progress() method from Regrtest to Logger.
* No longer pass Regrtest to RunWorkers, but logger and results.
* Add single.py and result.py files.
* Rename runtest.py to runtests.py.
* Move run_single_test() function and its helper functions to
single.py.
* Move remove_testfn(), abs_module_name() and normalize_test_name()
to utils.py.
* Move setup_support() to setup.py.
* Move type hints like TestName to utils.py.
* Rename runtest.py to runtests.py.
Add new worker.py file:
* Move create_worker_process() and worker_process() to this file.
* Add main() function to worker.py. create_worker_process() now
runs the command: "python -m test.libregrtest.worker JSON".
* create_worker_process() now starts the worker process in the
current working directory. Regrtest now gets the absolute path of
the reflog.txt filename: -R command line option filename.
* Remove --worker-json command line option.
Remove test_regrtest.test_worker_json().
Related changes:
* Add write_json() and from_json() methods to TestResult.
* Rename select_temp_dir() to get_temp_dir() and move it to utils.
* Rename make_temp_dir() to get_work_dir() and move it to utils.
It no longer calls os.makedirs(): Regrtest.main() now calls it.
* Move fix_umask() to utils. The function is now called by
setup_tests().
* Move StrPath to utils.
* Add exit_timeout() context manager to utils.
* RunTests: Replace junit_filename (StrPath) with use_junit (bool).
Fix test_pyexpat.test_exception(): it can now be run from a directory
different than Python source code directory. Before, the test failed
in this case.
Skip the test if Modules/pyexpat.c source is not available. Skip also
the test on Python implementations other than CPython.
Fix test_site.test_underpth_basic() when the working directory
contains at least one non-ASCII character: encode the "._pth" file to
UTF-8 and enable the UTF-8 Mode to use UTF-8 for the child process
stdout.
Attempts to pickle or create a shallow or deep copy of codecs streams
now raise a TypeError.
Previously, copying failed with a RecursionError, while pickling
produced wrong results that eventually caused unpickling to fail with
a RecursionError.
configure no longer uses libatomic by default when Python is
cross-compiled. The LIBATOMIC variable can be set manually in this
case:
./configure LIBATOMIC="-latomic" (...)
* Add attributes to Regrtest and RunTests:
* fail_env_changed
* num_workers
* Rename MultiprocessTestRunner to RunWorkers. Add num_workers
parameters to RunWorkers constructor. Remove RunWorkers.ns
attribute.
* Rename TestWorkerProcess to WorkerThread.
* get_running() now returns a string like: "running (...): ...".
* Regrtest.action_run_tests() now selects the number of worker
processes, instead of the command line parser.
* Add attributes to Regrtest and RunTests:
* gc_threshold
* memory_limit
* python_cmd
* use_resources
* Remove WorkerJob class. Add as_json() and from_json() methods to
RunTests. A worker process now only uses RunTests for all
parameters.
* Add tests on support.set_memlimit() in test_support. Create
_parse_memlimit() and also adds tests on it.
* Remove 'ns' parameter from runtest.py.
* Rename dash_R() runtest_refleak(). The function now gets
huntrleaks and quiet arguments, instead of 'ns' argument.
* Add attributes to Regrtest and RunTests:
* verbose
* quiet
* huntrleaks
* test_dir
* Add HuntRefleak class.
Refator Regrtest class:
* Rename finalize() finalize_tests().
* Pass tracer to run_test() and finalize_tests(). Remove Regrtest.tracer.
* run_test() does less things: move code to its caller.
* Regrtest.__init__() now copies 'ns' namespace attributes to
Regrtest attributes. Regrtest match_tests and ignore_tests
attributes have type FilterTuple (tuple), instead of a list.
* Add RunTests.copy(). Regrtest._rerun_failed_tests() now uses
RunTests.copy().
* Replace Regrtest.all_tests (list) with Regrtest.first_runtests
(RunTests).
* Make random_seed maximum 10x larger (9 digits, instead of 8).
* main() now calls _parse_args() and pass 'ns' to Regrtest
constructor. Remove kwargs argument from Regrtest.main().
* _parse_args() checks ns.huntrleaks.
* set_temp_dir() is now responsible to call expanduser().
* Regrtest.main() sets self.tests earlier.
* Add TestTuple and TestList types.
* Rename MatchTests to FilterTuple and rename MatchTestsDict
to FilterTestDict.
* TestResult.get_rerun_match_tests() return type
is now FilterTuple: return a tuple instead of a list.
RunTests.tests type becomes TestTuple.
Fix building the _testcapi extension on Linux AArch64 which requires
linking to libatomic when <cpython/pyatomic.h> is used: the
_Py_atomic_or_uint64() function requires libatomic
__atomic_fetch_or_8() on this platform.
The configure script now checks if linking to libatomic is needed and
generates a new LIBATOMIC variable used to build the _testcapi
extension.
Building the _testcapi extension now uses the LIBATOMIC variable in
its LDFLAGS, since Modules/_testcapi/pyatomic.c uses
<cpython/pyatomic.h>.
Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>
wim glenn
Guido van Rossum
Irit Katriel
Victor Stinner
Nikita Sobolev
Hugo van Kemenade
Serhiy Storchaka
Mark Shannon
云line
Delgan
Pieter Eendebak
Raymond Hettinger
Jelle Zijlstra
Tian Gao
AN Long
Alex Waygood
Pablo Galindo Salgado