bpo-32030: Rework memory allocators (#4625)

* 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
* Add support.with_pymalloc()
* 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().
* pythoninfo: add _testcapi collector for pymem

1 files changed, 1 insertions, 1 deletions

diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
index b89cbc88d4..01f314e4bd 100644
--- a/Python/pylifecycle.c
+++ b/Python/pylifecycle.c
@@ -630,7 +630,7 @@ _Py_InitializeCore(const _PyCoreConfig *config)
     }
 
     if (_PyMem_SetupAllocators(core_config.allocator) < 0) {
-        return _Py_INIT_ERR("Unknown PYTHONMALLOC allocator");
+        return _Py_INIT_USER_ERR("Unknown PYTHONMALLOC allocator");
     }
 
     if (_PyRuntime.initialized) {