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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
* 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
This commit is contained in:
Victor Stinner 2017-11-29 17:20:38 +01:00 • committed by GitHub
parent c15bb49d71
commit 5d39e04290
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GPG key ID: 4AEE18F83AFDEB23
14 changed files with 405 additions and 171 deletions
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26
Python/pystate.c
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@ -35,8 +35,8 @@ to avoid the expense of doing their own locking).
extern "C" {
#endif
_PyInitError
_PyRuntimeState_Init(_PyRuntimeState *runtime)
static _PyInitError
_PyRuntimeState_Init_impl(_PyRuntimeState *runtime)
{
memset(runtime, 0, sizeof(*runtime));
@ -59,14 +59,26 @@ _PyRuntimeState_Init(_PyRuntimeState *runtime)
return _Py_INIT_OK();
}
_PyInitError
_PyRuntimeState_Init(_PyRuntimeState *runtime)
{
/* Force default allocator, since _PyRuntimeState_Fini() must
use the same allocator than this function. */
PyMemAllocatorEx old_alloc;
_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
_PyInitError err = _PyRuntimeState_Init_impl(runtime);
PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
return err;
}
void
_PyRuntimeState_Fini(_PyRuntimeState *runtime)
{
/* Use the same memory allocator than _PyRuntimeState_Init() */
PyMemAllocatorEx old_alloc, raw_alloc;
PyMem_GetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
_PyMem_GetDefaultRawAllocator(&raw_alloc);
PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &raw_alloc);
/* Force the allocator used by _PyRuntimeState_Init(). */
PyMemAllocatorEx old_alloc;
_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
if (runtime->interpreters.mutex != NULL) {
PyThread_free_lock(runtime->interpreters.mutex);