diff options
Diffstat (limited to 'vcs-svn/obj_pool.h')
| -rw-r--r-- | vcs-svn/obj_pool.h | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/vcs-svn/obj_pool.h b/vcs-svn/obj_pool.h new file mode 100644 index 0000000000..deb6eb8135 --- /dev/null +++ b/vcs-svn/obj_pool.h @@ -0,0 +1,61 @@ +/* + * Licensed under a two-clause BSD-style license. + * See LICENSE for details. + */ + +#ifndef OBJ_POOL_H_ +#define OBJ_POOL_H_ + +#include "git-compat-util.h" + +#define MAYBE_UNUSED __attribute__((__unused__)) + +#define obj_pool_gen(pre, obj_t, initial_capacity) \ +static struct { \ + uint32_t committed; \ + uint32_t size; \ + uint32_t capacity; \ + obj_t *base; \ +} pre##_pool = {0, 0, 0, NULL}; \ +static MAYBE_UNUSED uint32_t pre##_alloc(uint32_t count) \ +{ \ + uint32_t offset; \ + if (pre##_pool.size + count > pre##_pool.capacity) { \ + while (pre##_pool.size + count > pre##_pool.capacity) \ + if (pre##_pool.capacity) \ + pre##_pool.capacity *= 2; \ + else \ + pre##_pool.capacity = initial_capacity; \ + pre##_pool.base = realloc(pre##_pool.base, \ + pre##_pool.capacity * sizeof(obj_t)); \ + } \ + offset = pre##_pool.size; \ + pre##_pool.size += count; \ + return offset; \ +} \ +static MAYBE_UNUSED void pre##_free(uint32_t count) \ +{ \ + pre##_pool.size -= count; \ +} \ +static MAYBE_UNUSED uint32_t pre##_offset(obj_t *obj) \ +{ \ + return obj == NULL ? ~0 : obj - pre##_pool.base; \ +} \ +static MAYBE_UNUSED obj_t *pre##_pointer(uint32_t offset) \ +{ \ + return offset >= pre##_pool.size ? NULL : &pre##_pool.base[offset]; \ +} \ +static MAYBE_UNUSED void pre##_commit(void) \ +{ \ + pre##_pool.committed = pre##_pool.size; \ +} \ +static MAYBE_UNUSED void pre##_reset(void) \ +{ \ + free(pre##_pool.base); \ + pre##_pool.base = NULL; \ + pre##_pool.size = 0; \ + pre##_pool.capacity = 0; \ + pre##_pool.committed = 0; \ +} + +#endif |