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95bb9d4c32
The realloc counter is declared outside the struct for the given slabname, which makes it harder for a follow up patch to move the declaration of the struct around as then the counter variable would need special treatment. As the reallocation counter is currently unused we can just remove it. If we ever need to count the reallocations again, we can reintroduce the counter as part of 'struct slabname' in commit-slab-decl.h. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
#ifndef COMMIT_SLAB_IMPL_H
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#define COMMIT_SLAB_IMPL_H
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#define MAYBE_UNUSED __attribute__((__unused__))
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#define implement_static_commit_slab(slabname, elemtype) \
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implement_commit_slab(slabname, elemtype, static MAYBE_UNUSED)
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#define implement_shared_commit_slab(slabname, elemtype) \
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implement_commit_slab(slabname, elemtype, )
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#define implement_commit_slab(slabname, elemtype, scope) \
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\
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scope void init_ ##slabname## _with_stride(struct slabname *s, \
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unsigned stride) \
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{ \
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unsigned int elem_size; \
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if (!stride) \
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stride = 1; \
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s->stride = stride; \
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elem_size = sizeof(elemtype) * stride; \
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s->slab_size = COMMIT_SLAB_SIZE / elem_size; \
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s->slab_count = 0; \
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s->slab = NULL; \
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} \
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\
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scope void init_ ##slabname(struct slabname *s) \
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{ \
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init_ ##slabname## _with_stride(s, 1); \
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} \
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\
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scope void clear_ ##slabname(struct slabname *s) \
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{ \
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unsigned int i; \
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for (i = 0; i < s->slab_count; i++) \
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free(s->slab[i]); \
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s->slab_count = 0; \
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FREE_AND_NULL(s->slab); \
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} \
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\
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scope elemtype *slabname## _at_peek(struct slabname *s, \
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const struct commit *c, \
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int add_if_missing) \
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{ \
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unsigned int nth_slab, nth_slot; \
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\
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nth_slab = c->index / s->slab_size; \
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nth_slot = c->index % s->slab_size; \
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\
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if (s->slab_count <= nth_slab) { \
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unsigned int i; \
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if (!add_if_missing) \
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return NULL; \
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REALLOC_ARRAY(s->slab, nth_slab + 1); \
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for (i = s->slab_count; i <= nth_slab; i++) \
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s->slab[i] = NULL; \
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s->slab_count = nth_slab + 1; \
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} \
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if (!s->slab[nth_slab]) { \
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if (!add_if_missing) \
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return NULL; \
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s->slab[nth_slab] = xcalloc(s->slab_size, \
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sizeof(**s->slab) * s->stride); \
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} \
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return &s->slab[nth_slab][nth_slot * s->stride]; \
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} \
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\
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scope elemtype *slabname## _at(struct slabname *s, \
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const struct commit *c) \
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{ \
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return slabname##_at_peek(s, c, 1); \
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} \
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\
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scope elemtype *slabname## _peek(struct slabname *s, \
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const struct commit *c) \
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{ \
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return slabname##_at_peek(s, c, 0); \
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} \
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\
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struct slabname
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/*
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* Note that this redundant forward declaration is required
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* to allow a terminating semicolon, which makes instantiations look
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* like function declarations. I.e., the expansion of
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*
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* implement_commit_slab(indegree, int, static);
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*
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* ends in 'struct indegree;'. This would otherwise
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* be a syntax error according (at least) to ISO C. It's hard to
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* catch because GCC silently parses it by default.
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*/
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#endif /* COMMIT_SLAB_IMPL_H */
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