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make retry on oom an option; revise size options to not overflow the long

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daanx 2024-05-18 09:56:02 -07:00
parent e58fa376d4
commit 1b21415dfa
4 changed files with 43 additions and 26 deletions
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4
include/mimalloc/internal.h
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@ -358,10 +358,10 @@ static inline bool mi_mul_overflow(size_t count, size_t size, size_t* total) {
}
#else /* __builtin_umul_overflow is unavailable */
static inline bool mi_mul_overflow(size_t count, size_t size, size_t* total) {
#define MI_MUL_NO_OVERFLOW ((size_t)1 << (4*sizeof(size_t))) // sqrt(SIZE_MAX)
#define MI_MUL_COULD_OVERFLOW ((size_t)1 << (4*sizeof(size_t))) // sqrt(SIZE_MAX)
*total = count * size;
// note: gcc/clang optimize this to directly check the overflow flag
return ((size >= MI_MUL_NO_OVERFLOW || count >= MI_MUL_NO_OVERFLOW) && size > 0 && (SIZE_MAX / size) < count);
return ((size >= MI_MUL_COULD_OVERFLOW || count >= MI_MUL_COULD_OVERFLOW) && size > 0 && (SIZE_MAX / size) < count);
}
#endif