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61 lines
1.5 KiB
61 lines
1.5 KiB
/* |
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* Licensed under a two-clause BSD-style license. |
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* See LICENSE for details. |
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*/ |
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#ifndef OBJ_POOL_H_ |
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#define OBJ_POOL_H_ |
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#include "git-compat-util.h" |
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#define MAYBE_UNUSED __attribute__((__unused__)) |
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#define obj_pool_gen(pre, obj_t, initial_capacity) \ |
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static struct { \ |
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uint32_t committed; \ |
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uint32_t size; \ |
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uint32_t capacity; \ |
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obj_t *base; \ |
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} pre##_pool = {0, 0, 0, NULL}; \ |
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static MAYBE_UNUSED uint32_t pre##_alloc(uint32_t count) \ |
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{ \ |
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uint32_t offset; \ |
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if (pre##_pool.size + count > pre##_pool.capacity) { \ |
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while (pre##_pool.size + count > pre##_pool.capacity) \ |
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if (pre##_pool.capacity) \ |
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pre##_pool.capacity *= 2; \ |
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else \ |
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pre##_pool.capacity = initial_capacity; \ |
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pre##_pool.base = realloc(pre##_pool.base, \ |
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pre##_pool.capacity * sizeof(obj_t)); \ |
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} \ |
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offset = pre##_pool.size; \ |
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pre##_pool.size += count; \ |
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return offset; \ |
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} \ |
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static MAYBE_UNUSED void pre##_free(uint32_t count) \ |
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{ \ |
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pre##_pool.size -= count; \ |
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} \ |
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static MAYBE_UNUSED uint32_t pre##_offset(obj_t *obj) \ |
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{ \ |
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return obj == NULL ? ~0 : obj - pre##_pool.base; \ |
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} \ |
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static MAYBE_UNUSED obj_t *pre##_pointer(uint32_t offset) \ |
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{ \ |
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return offset >= pre##_pool.size ? NULL : &pre##_pool.base[offset]; \ |
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} \ |
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static MAYBE_UNUSED void pre##_commit(void) \ |
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{ \ |
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pre##_pool.committed = pre##_pool.size; \ |
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} \ |
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static MAYBE_UNUSED void pre##_reset(void) \ |
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{ \ |
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free(pre##_pool.base); \ |
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pre##_pool.base = NULL; \ |
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pre##_pool.size = 0; \ |
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pre##_pool.capacity = 0; \ |
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pre##_pool.committed = 0; \ |
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} |
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#endif
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