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8614f86b71
* gh-131525: Cache the result of tuple_hash * Fix debug builds * Add blurb * Fix formatting * Pre-compute empty tuple singleton * Mostly set the cache within tuple_alloc * Fixes for TSAN * Pre-compute empty tuple singleton * Fix for 32-bit platforms * Assert that op != NULL in _PyTuple_RESET_HASH_CACHE * Use FT_ATOMIC_STORE_SSIZE_RELAXED macro * Update Include/internal/pycore_tuple.h Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com> * Fix alignment * atomic load * Update Objects/tupleobject.c Co-authored-by: Chris Eibl <138194463+chris-eibl@users.noreply.github.com> --------- Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com> Co-authored-by: Chris Eibl <138194463+chris-eibl@users.noreply.github.com>
75 lines
2.5 KiB
C
75 lines
2.5 KiB
C
#ifndef Py_INTERNAL_TUPLE_H
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#define Py_INTERNAL_TUPLE_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef Py_BUILD_CORE
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# error "this header requires Py_BUILD_CORE define"
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#endif
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#include "pycore_object.h" // _PyObject_GC_IS_TRACKED
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#include "pycore_structs.h" // _PyStackRef
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extern void _PyTuple_MaybeUntrack(PyObject *);
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extern void _PyTuple_DebugMallocStats(FILE *out);
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/* runtime lifecycle */
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extern PyStatus _PyTuple_InitGlobalObjects(PyInterpreterState *);
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/* other API */
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#define _PyTuple_ITEMS(op) _Py_RVALUE(_PyTuple_CAST(op)->ob_item)
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PyAPI_FUNC(PyObject *)_PyTuple_FromArray(PyObject *const *, Py_ssize_t);
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PyAPI_FUNC(PyObject *)_PyTuple_FromStackRefStealOnSuccess(const union _PyStackRef *, Py_ssize_t);
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PyAPI_FUNC(PyObject *)_PyTuple_FromArraySteal(PyObject *const *, Py_ssize_t);
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typedef struct {
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PyObject_HEAD
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Py_ssize_t it_index;
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PyTupleObject *it_seq; /* Set to NULL when iterator is exhausted */
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} _PyTupleIterObject;
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#define _PyTuple_RESET_HASH_CACHE(op) \
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do { \
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assert(op != NULL); \
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_PyTuple_CAST(op)->ob_hash = -1; \
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} while (0)
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/* bpo-42536: If reusing a tuple object, this should be called to re-track it
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with the garbage collector and reset its hash cache. */
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static inline void
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_PyTuple_Recycle(PyObject *op)
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{
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_PyTuple_RESET_HASH_CACHE(op);
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if (!_PyObject_GC_IS_TRACKED(op)) {
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_PyObject_GC_TRACK(op);
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}
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}
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/* Below are the official constants from the xxHash specification. Optimizing
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compilers should emit a single "rotate" instruction for the
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_PyTuple_HASH_XXROTATE() expansion. If that doesn't happen for some important
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platform, the macro could be changed to expand to a platform-specific rotate
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spelling instead.
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*/
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#if SIZEOF_PY_UHASH_T > 4
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#define _PyTuple_HASH_XXPRIME_1 ((Py_uhash_t)11400714785074694791ULL)
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#define _PyTuple_HASH_XXPRIME_2 ((Py_uhash_t)14029467366897019727ULL)
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#define _PyTuple_HASH_XXPRIME_5 ((Py_uhash_t)2870177450012600261ULL)
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#define _PyTuple_HASH_XXROTATE(x) ((x << 31) | (x >> 33)) /* Rotate left 31 bits */
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#else
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#define _PyTuple_HASH_XXPRIME_1 ((Py_uhash_t)2654435761UL)
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#define _PyTuple_HASH_XXPRIME_2 ((Py_uhash_t)2246822519UL)
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#define _PyTuple_HASH_XXPRIME_5 ((Py_uhash_t)374761393UL)
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#define _PyTuple_HASH_XXROTATE(x) ((x << 13) | (x >> 19)) /* Rotate left 13 bits */
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#endif
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#define _PyTuple_HASH_EMPTY (_PyTuple_HASH_XXPRIME_5 + (_PyTuple_HASH_XXPRIME_5 ^ 3527539UL))
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_INTERNAL_TUPLE_H */
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