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Expand MALLOC_COPY and MALLOC_ZERO to memcpy and memset.

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This commit is contained in:
Ondřej Bílka
2013-12-10 19:36:28 +01:00
parent 5782a80f9f
commit 0dfa665cc1
3 changed files with 14 additions and 19 deletions
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23
malloc/malloc.c
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@ -1072,19 +1072,6 @@ static void* malloc_atfork(size_t sz, const void *caller);
static void free_atfork(void* mem, const void *caller);
#endif
/* ------------- Optional versions of memcopy ---------------- */
/*
Note: memcpy is ONLY invoked with non-overlapping regions,
so the (usually slower) memmove is not needed.
*/
#define MALLOC_COPY(dest, src, nbytes) memcpy(dest, src, nbytes)
#define MALLOC_ZERO(dest, nbytes) memset(dest, 0, nbytes)
/* ------------------ MMAP support ------------------ */
@ -2956,7 +2943,7 @@ __libc_realloc(void* oldmem, size_t bytes)
/* Must alloc, copy, free. */
newmem = __libc_malloc(bytes);
if (newmem == 0) return 0; /* propagate failure */
MALLOC_COPY(newmem, oldmem, oldsize - 2*SIZE_SZ);
memcpy(newmem, oldmem, oldsize - 2*SIZE_SZ);
munmap_chunk(oldp);
return newmem;
}
@ -2987,7 +2974,7 @@ __libc_realloc(void* oldmem, size_t bytes)
newp = __libc_malloc(bytes);
if (newp != NULL)
{
MALLOC_COPY (newp, oldmem, oldsize - SIZE_SZ);
memcpy (newp, oldmem, oldsize - SIZE_SZ);
_int_free(ar_ptr, oldp, 0);
}
}
@ -3175,7 +3162,7 @@ __libc_calloc(size_t n, size_t elem_size)
if (chunk_is_mmapped (p))
{
if (__builtin_expect (perturb_byte, 0))
return MALLOC_ZERO (mem, sz);
return memset (mem, 0, sz);
return mem;
}
@ -3197,7 +3184,7 @@ __libc_calloc(size_t n, size_t elem_size)
assert(nclears >= 3);
if (nclears > 9)
return MALLOC_ZERO(d, clearsize);
return memset(d, 0, clearsize);
else {
*(d+0) = 0;
@ -4201,7 +4188,7 @@ _int_realloc(mstate av, mchunkptr oldp, INTERNAL_SIZE_T oldsize,
assert(ncopies >= 3);
if (ncopies > 9)
MALLOC_COPY(d, s, copysize);
memcpy(d, s, copysize);
else {
*(d+0) = *(s+0);