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gh-115999: Specialize LOAD_SUPER_ATTR in free-threaded builds (gh-127128)

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Use existing helpers to atomically modify the bytecode.  Add unit tests
to ensure specializing is happening as expected.  Add test_specialize.py
that can be used with ThreadSanitizer to detect data races.  
Fix thread safety issue with cell_set_contents().
This commit is contained in:
Neil Schemenauer 2024-12-03 09:32:26 -08:00 • committed by GitHub
parent 8ba9f5bca9
commit 0cb5222079
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GPG key ID: B5690EEEBB952194
6 changed files with 51 additions and 21 deletions
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19
Python/specialize.c
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@ -794,9 +794,8 @@ _Py_Specialize_LoadSuperAttr(_PyStackRef global_super_st, _PyStackRef cls_st, _P
PyObject *global_super = PyStackRef_AsPyObjectBorrow(global_super_st);
PyObject *cls = PyStackRef_AsPyObjectBorrow(cls_st);
assert(ENABLE_SPECIALIZATION);
assert(ENABLE_SPECIALIZATION_FT);
assert(_PyOpcode_Caches[LOAD_SUPER_ATTR] == INLINE_CACHE_ENTRIES_LOAD_SUPER_ATTR);
_PySuperAttrCache *cache = (_PySuperAttrCache *)(instr + 1);
if (global_super != (PyObject *)&PySuper_Type) {
SPECIALIZATION_FAIL(LOAD_SUPER_ATTR, SPEC_FAIL_SUPER_SHADOWED);
goto fail;
@ -805,19 +804,11 @@ _Py_Specialize_LoadSuperAttr(_PyStackRef global_super_st, _PyStackRef cls_st, _P
SPECIALIZATION_FAIL(LOAD_SUPER_ATTR, SPEC_FAIL_SUPER_BAD_CLASS);
goto fail;
}
instr->op.code = load_method ? LOAD_SUPER_ATTR_METHOD : LOAD_SUPER_ATTR_ATTR;
goto success;
fail:
STAT_INC(LOAD_SUPER_ATTR, failure);
assert(!PyErr_Occurred());
instr->op.code = LOAD_SUPER_ATTR;
cache->counter = adaptive_counter_backoff(cache->counter);
uint8_t load_code = load_method ? LOAD_SUPER_ATTR_METHOD : LOAD_SUPER_ATTR_ATTR;
specialize(instr, load_code);
return;
success:
STAT_INC(LOAD_SUPER_ATTR, success);
assert(!PyErr_Occurred());
cache->counter = adaptive_counter_cooldown();
fail:
unspecialize(instr);
}
typedef enum {