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Implement the *allocx() API.

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Implement the *allocx() API, which is a successor to the *allocm() API.
The *allocx() functions are slightly simpler to use because they have
fewer parameters, they directly return the results of primary interest,
and mallocx()/rallocx() avoid the strict aliasing pitfall that
allocm()/rallocx() share with posix_memalign().  The following code
violates strict aliasing rules:

    foo_t *foo;
    allocm((void **)&foo, NULL, 42, 0);

whereas the following is safe:

    foo_t *foo;
    void *p;
    allocm(&p, NULL, 42, 0);
    foo = (foo_t *)p;

mallocx() does not have this problem:

    foo_t *foo = (foo_t *)mallocx(42, 0);
This commit is contained in:
Jason Evans
2013-12-12 22:35:52 -08:00
parent 0ac396a06a
commit d82a5e6a34
19 changed files with 954 additions and 365 deletions
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6
src/arena.c
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@@ -2031,7 +2031,7 @@ arena_ralloc(arena_t *arena, void *ptr, size_t oldsize, size_t size,
size_t usize = sa2u(size + extra, alignment);
if (usize == 0)
return (NULL);
ret = ipallocx(usize, alignment, zero, try_tcache_alloc, arena);
ret = ipalloct(usize, alignment, zero, try_tcache_alloc, arena);
} else
ret = arena_malloc(arena, size + extra, zero, try_tcache_alloc);
@@ -2043,7 +2043,7 @@ arena_ralloc(arena_t *arena, void *ptr, size_t oldsize, size_t size,
size_t usize = sa2u(size, alignment);
if (usize == 0)
return (NULL);
ret = ipallocx(usize, alignment, zero, try_tcache_alloc,
ret = ipalloct(usize, alignment, zero, try_tcache_alloc,
arena);
} else
ret = arena_malloc(arena, size, zero, try_tcache_alloc);
@@ -2061,7 +2061,7 @@ arena_ralloc(arena_t *arena, void *ptr, size_t oldsize, size_t size,
copysize = (size < oldsize) ? size : oldsize;
VALGRIND_MAKE_MEM_UNDEFINED(ret, copysize);
memcpy(ret, ptr, copysize);
iqallocx(ptr, try_tcache_dalloc);
iqalloct(ptr, try_tcache_dalloc);
return (ret);
}