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Small changes in hash of pointers

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When converting from pointer to integer, use 'uintptr_t' if available;
otherwise try 'uintmax_t', and use 'size_t' as last resource.
This commit is contained in:
Roberto Ierusalimschy 2023-02-02 13:37:11 -03:00
parent d69789da1c
commit c888ae0aea
1 changed files with 17 additions and 4 deletions
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21
llimits.h
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@ -71,11 +71,24 @@ typedef signed char ls_byte;
/*
** conversion of pointer to unsigned integer:
** this is for hashing only; there is no problem if the integer
** cannot hold the whole pointer value
** conversion of pointer to unsigned integer: this is for hashing only;
** there is no problem if the integer cannot hold the whole pointer
** value. (In strict ISO C this may cause undefined behavior, but no
** actual machine seems to bother.)
*/
#define point2uint(p) ((unsigned int)((size_t)(p) & UINT_MAX))
#if !defined(LUA_USE_C89) && defined(__STDC_VERSION__) && \
__STDC_VERSION__ >= 199901L
#include <stdint.h>
#if defined(UINTPTR_MAX) /* even in C99 this type is optional */
#define L_P2I uintptr_t
#else /* no 'intptr'? */
#define L_P2I uintmax_t /* use the largerst available integer */
#endif
#else /* C89 option */
#define L_P2I size_t
#endif
#define point2uint(p) ((unsigned int)((L_P2I)(p) & UINT_MAX))