mirror of
https://github.com/git/git.git
synced 2024-11-24 10:26:17 +08:00
a9f1f1f9f8
The struct declaration and implementation macros are moved to commit-slab-hdr.h and commit-slab-impl.h respectively. This right now is not needed for current users but if we make a public commit-slab type, we may want to avoid including the slab implementation in a header file which gets replicated in every c file that includes it. Signed-off-by: Junio C Hamano <gitster@pobox.com>
92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
#ifndef COMMIT_SLAB_IMPL_H
|
|
#define COMMIT_SLAB_IMPL_H
|
|
|
|
#define MAYBE_UNUSED __attribute__((__unused__))
|
|
|
|
#define implement_commit_slab(slabname, elemtype) \
|
|
\
|
|
static int stat_ ##slabname## realloc; \
|
|
\
|
|
static MAYBE_UNUSED void init_ ##slabname## _with_stride(struct slabname *s, \
|
|
unsigned stride) \
|
|
{ \
|
|
unsigned int elem_size; \
|
|
if (!stride) \
|
|
stride = 1; \
|
|
s->stride = stride; \
|
|
elem_size = sizeof(elemtype) * stride; \
|
|
s->slab_size = COMMIT_SLAB_SIZE / elem_size; \
|
|
s->slab_count = 0; \
|
|
s->slab = NULL; \
|
|
} \
|
|
\
|
|
static MAYBE_UNUSED void init_ ##slabname(struct slabname *s) \
|
|
{ \
|
|
init_ ##slabname## _with_stride(s, 1); \
|
|
} \
|
|
\
|
|
static MAYBE_UNUSED void clear_ ##slabname(struct slabname *s) \
|
|
{ \
|
|
unsigned int i; \
|
|
for (i = 0; i < s->slab_count; i++) \
|
|
free(s->slab[i]); \
|
|
s->slab_count = 0; \
|
|
FREE_AND_NULL(s->slab); \
|
|
} \
|
|
\
|
|
static MAYBE_UNUSED elemtype *slabname## _at_peek(struct slabname *s, \
|
|
const struct commit *c, \
|
|
int add_if_missing) \
|
|
{ \
|
|
unsigned int nth_slab, nth_slot; \
|
|
\
|
|
nth_slab = c->index / s->slab_size; \
|
|
nth_slot = c->index % s->slab_size; \
|
|
\
|
|
if (s->slab_count <= nth_slab) { \
|
|
unsigned int i; \
|
|
if (!add_if_missing) \
|
|
return NULL; \
|
|
REALLOC_ARRAY(s->slab, nth_slab + 1); \
|
|
stat_ ##slabname## realloc++; \
|
|
for (i = s->slab_count; i <= nth_slab; i++) \
|
|
s->slab[i] = NULL; \
|
|
s->slab_count = nth_slab + 1; \
|
|
} \
|
|
if (!s->slab[nth_slab]) { \
|
|
if (!add_if_missing) \
|
|
return NULL; \
|
|
s->slab[nth_slab] = xcalloc(s->slab_size, \
|
|
sizeof(**s->slab) * s->stride); \
|
|
} \
|
|
return &s->slab[nth_slab][nth_slot * s->stride]; \
|
|
} \
|
|
\
|
|
static MAYBE_UNUSED elemtype *slabname## _at(struct slabname *s, \
|
|
const struct commit *c) \
|
|
{ \
|
|
return slabname##_at_peek(s, c, 1); \
|
|
} \
|
|
\
|
|
static MAYBE_UNUSED elemtype *slabname## _peek(struct slabname *s, \
|
|
const struct commit *c) \
|
|
{ \
|
|
return slabname##_at_peek(s, c, 0); \
|
|
} \
|
|
\
|
|
struct slabname
|
|
|
|
/*
|
|
* Note that this redundant forward declaration is required
|
|
* to allow a terminating semicolon, which makes instantiations look
|
|
* like function declarations. I.e., the expansion of
|
|
*
|
|
* implement_commit_slab(indegree, int);
|
|
*
|
|
* ends in 'struct indegree;'. This would otherwise
|
|
* be a syntax error according (at least) to ISO C. It's hard to
|
|
* catch because GCC silently parses it by default.
|
|
*/
|
|
|
|
#endif /* COMMIT_SLAB_IMPL_H */
|