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bpo-43977: Use tp_flags for collection matching (GH-25723)

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* Add Py_TPFLAGS_SEQUENCE and Py_TPFLAGS_MAPPING, add to all relevant standard builtin classes.

* Set relevant flags on collections.abc.Sequence and Mapping.

* Use flags in MATCH_SEQUENCE and MATCH_MAPPING opcodes.

* Inherit Py_TPFLAGS_SEQUENCE and Py_TPFLAGS_MAPPING.

* Add NEWS

* Remove interpreter-state map_abc and seq_abc fields.
This commit is contained in:
Mark Shannon 2021-04-30 09:50:28 +01:00 • committed by GitHub
parent 2abbd8f2ad
commit 069e81ab3d
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16 changed files with 74 additions and 83 deletions
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7
Include/object.h
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@ -320,6 +320,13 @@ Code can use PyType_HasFeature(type_ob, flag_value) to test whether the
given type object has a specified feature.
*/
#ifndef Py_LIMITED_API
/* Set if instances of the type object are treated as sequences for pattern matching */
#define Py_TPFLAGS_SEQUENCE (1 << 5)
/* Set if instances of the type object are treated as mappings for pattern matching */
#define Py_TPFLAGS_MAPPING (1 << 6)
#endif
/* Set if the type object is immutable: type attributes cannot be set nor deleted */
#define Py_TPFLAGS_IMMUTABLETYPE (1UL << 8)