bpo-32030: Rework memory allocators #4625
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* Fix _PyMem_SetupAllocators("debug"): always restore allocators to
the defaults, rather than only caling _PyMem_SetupDebugHooks().
* Add _PyMem_SetDefaultAllocator() helper to set the "default"
allocator.
* Add _PyMem_GetAllocatorsName(): get the name of the allocators
* main() now uses debug hooks on memory allocators if Py_DEBUG is
defined, rather than calling directly malloc()
* Document default memory allocators in C API documentation
* _Py_InitializeCore() now fails with a fatal user error if
PYTHONMALLOC value is an unknown memory allocator, instead of
failing with a fatal internal error.
* Add new tests on the PYTHONMALLOC environment variable
vstinner
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I tested manually the PR. I ran "test_sys test_cmd_line test_capi" tests in these configurations:
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Add the _testcapi.WITH_PYMALLOC constant and expose it as
support.with_pymalloc().
sysconfig.get_config_var('WITH_PYMALLOC') doesn't work on Windows, so
replace it with support.with_pymalloc().
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the defaults, rather than only caling _PyMem_SetupDebugHooks().
allocator.
defined, rather than calling directly malloc()
https://bugs.python.org/issue32030