#ifndef COMMIT_SLAB_IMPL_H

#define COMMIT_SLAB_IMPL_H

#define MAYBE_UNUSED __attribute__((__unused__))

#define implement_static_commit_slab(slabname, elemtype) \

implement_commit_slab(slabname, elemtype, static MAYBE_UNUSED)

#define implement_shared_commit_slab(slabname, elemtype) \

implement_commit_slab(slabname, elemtype, )

#define implement_commit_slab(slabname, elemtype, scope) \

\

scope 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; \

} \

\

scope void init_ ##slabname(struct slabname *s) \

{ \

init_ ##slabname## _with_stride(s, 1); \

} \

\

scope 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); \

} \

\

scope 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); \

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]; \

} \

\

scope elemtype *slabname## _at(struct slabname *s, \

const struct commit *c) \

{ \

return slabname##_at_peek(s, c, 1); \

} \

\

scope elemtype *slabname## _peek(struct slabname *s, \

const struct commit *c) \

{ \

return slabname##_at_peek(s, c, 0); \

} \

\

struct slabname

#endif /* COMMIT_SLAB_IMPL_H */