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https://github.com/johndoe6345789/typthon.git
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b198f511d2
Massive automated renaming of all Py_/PyObject/etc. prefixes to Ty_/TyObject/etc. This includes: - All public API types (TyObject, TyTypeObject, etc.) - All public API functions (Ty_Initialize, Ty_BuildValue, etc.) - All internal API (_Ty_ prefixes) - Reference counting macros (Ty_INCREF, Ty_DECREF, etc.) - Type flags (Ty_TPFLAGS_*) - Debug flags (Ty_DEBUG, Ty_TRACE_REFS, etc.) - All object type APIs (TyList_, TyDict_, TyUnicode_, etc.) This changes over 60,000 occurrences across 1000+ files. Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>
92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
#ifndef Ty_INTERNAL_PYHASH_H
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#define Ty_INTERNAL_PYHASH_H
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#ifndef Ty_BUILD_CORE
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# error "this header requires Ty_BUILD_CORE define"
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#endif
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// Similar to Ty_HashPointer(), but don't replace -1 with -2.
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static inline Ty_hash_t
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_Ty_HashPointerRaw(const void *ptr)
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{
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uintptr_t x = (uintptr_t)ptr;
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Ty_BUILD_ASSERT(sizeof(x) == sizeof(ptr));
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// Bottom 3 or 4 bits are likely to be 0; rotate x by 4 to the right
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// to avoid excessive hash collisions for dicts and sets.
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x = (x >> 4) | (x << (8 * sizeof(uintptr_t) - 4));
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Ty_BUILD_ASSERT(sizeof(x) == sizeof(Ty_hash_t));
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return (Ty_hash_t)x;
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}
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/* Hash secret
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*
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* memory layout on 64 bit systems
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* cccccccc cccccccc cccccccc uc -- unsigned char[24]
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* pppppppp ssssssss ........ fnv -- two Ty_hash_t
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* k0k0k0k0 k1k1k1k1 ........ siphash -- two uint64_t
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* ........ ........ ssssssss djbx33a -- 16 bytes padding + one Ty_hash_t
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* ........ ........ eeeeeeee pyexpat XML hash salt
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*
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* memory layout on 32 bit systems
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* cccccccc cccccccc cccccccc uc
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* ppppssss ........ ........ fnv -- two Ty_hash_t
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* k0k0k0k0 k1k1k1k1 ........ siphash -- two uint64_t (*)
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* ........ ........ ssss.... djbx33a -- 16 bytes padding + one Ty_hash_t
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* ........ ........ eeee.... pyexpat XML hash salt
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*
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* (*) The siphash member may not be available on 32 bit platforms without
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* an unsigned int64 data type.
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*/
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typedef union {
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/* ensure 24 bytes */
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unsigned char uc[24];
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/* two Ty_hash_t for FNV */
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struct {
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Ty_hash_t prefix;
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Ty_hash_t suffix;
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} fnv;
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/* two uint64 for SipHash24 */
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struct {
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uint64_t k0;
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uint64_t k1;
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} siphash;
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/* a different (!) Ty_hash_t for small string optimization */
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struct {
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unsigned char padding[16];
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Ty_hash_t suffix;
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} djbx33a;
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struct {
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unsigned char padding[16];
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Ty_hash_t hashsalt;
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} expat;
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} _Ty_HashSecret_t;
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// Export for '_elementtree' shared extension
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PyAPI_DATA(_Ty_HashSecret_t) _Ty_HashSecret;
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#ifdef Ty_DEBUG
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extern int _Ty_HashSecret_Initialized;
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#endif
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#ifndef MS_WINDOWS
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# define _py_urandom_cache_INIT \
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{ \
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.fd = -1, \
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}
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#else
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# define _py_urandom_cache_INIT {0}
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#endif
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#define pyhash_state_INIT \
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{ \
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.urandom_cache = _py_urandom_cache_INIT, \
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}
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extern uint64_t _Ty_KeyedHash(uint64_t key, const void *src, Ty_ssize_t src_sz);
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#endif // !Ty_INTERNAL_PYHASH_H
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