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u3: adds u3a_wtrim(), for shrinking word-aligned allocations

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This commit is contained in:
Joe Bryan 2020-09-25 19:21:18 -07:00
parent 4ce4ce1974
commit 012991310b
2 changed files with 27 additions and 0 deletions
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5
pkg/urbit/include/noun/allocate.h
View File

@ -429,6 +429,11 @@
void
u3a_wfree(void* lag_v);
/* u3a_wtrim(): trim storage.
*/
void
u3a_wtrim(void* tox_v, c3_w old_w, c3_w len_w);
/* u3a_wealloc(): word realloc.
*/
void*

22
pkg/urbit/noun/allocate.c
View File

@ -632,6 +632,28 @@ u3a_wfree(void* tox_v)
_box_free(u3a_botox(tox_v));
}
/* u3a_wtrim(): trim storage.
*/
void
u3a_wtrim(void* tox_v, c3_w old_w, c3_w len_w)
{
c3_w* nov_w = tox_v;
if ( (old_w > len_w)
&& ((old_w - len_w) >= u3a_minimum) )
{
c3_w* box_w = (void *)u3a_botox(nov_w);
c3_w* end_w = (nov_w + len_w + 1);
c3_w asz_w = (end_w - box_w);
c3_w bsz_w = box_w[0] - asz_w;
_box_attach(_box_make(end_w, bsz_w, 0));
box_w[0] = asz_w;
box_w[asz_w - 1] = asz_w;
}
}
/* u3a_calloc(): allocate and zero-initialize array
*/
void*