Permalink
Cannot retrieve contributors at this time
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
107 lines (101 sloc)
3.08 KB
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #ifndef COMMIT_SLAB_IMPL_H | |
| #define COMMIT_SLAB_IMPL_H | |
| #include "git-compat-util.h" | |
| #define implement_static_commit_slab(slabname, elemtype) \ | |
| implement_commit_slab(slabname, elemtype, MAYBE_UNUSED static) | |
| #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 void deep_clear_ ##slabname(struct slabname *s, void (*free_fn)(elemtype *)) \ | |
| { \ | |
| unsigned int i; \ | |
| for (i = 0; i < s->slab_count; i++) { \ | |
| unsigned int j; \ | |
| if (!s->slab[i]) \ | |
| continue; \ | |
| for (j = 0; j < s->slab_size; j++) \ | |
| free_fn(&s->slab[i][j * s->stride]); \ | |
| } \ | |
| clear_ ##slabname(s); \ | |
| } \ | |
| \ | |
| 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 | |
| /* | |
| * 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, static); | |
| * | |
| * 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 */ |