92 lines
3 KiB
C
92 lines
3 KiB
C
/* Copyright (C) CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/*!
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* \brief Memory allocation related functions.
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*/
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#pragma once
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#include <libknot/mm_ctx.h>
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#include "contrib/ucw/mempool.h"
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#include "lib/defines.h"
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#include <assert.h>
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#include <stdint.h>
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/*! \brief Default memory block size. */
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#define MM_DEFAULT_BLKSIZE 4096
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/*! \brief Allocs using 'mm' if any, uses system malloc() otherwise. */
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KR_EXPORT
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void *mm_alloc(knot_mm_t *mm, size_t size);
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/*! \brief Callocs using 'mm' if any, uses system calloc() otherwise. */
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void *mm_calloc(knot_mm_t *mm, size_t nmemb, size_t size);
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/*! \brief Reallocs using 'mm' if any, uses system realloc() otherwise. */
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KR_EXPORT
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void *mm_realloc(knot_mm_t *mm, void *what, size_t size, size_t prev_size);
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/*! \brief Strdups using 'mm' if any, uses system strdup() otherwise. */
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char *mm_strdup(knot_mm_t *mm, const char *s);
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/*! \brief Free using 'mm' if any, uses system free() otherwise. */
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KR_EXPORT
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void mm_free(knot_mm_t *mm, void *what);
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/*! \brief Initialize default memory allocation context. */
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void mm_ctx_init(knot_mm_t *mm);
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/*! \brief Memory pool context. */
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void mm_ctx_mempool(knot_mm_t *mm, size_t chunk_size);
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/* API in addition to Knot's mempattern. */
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/*! \brief New memory pool context, allocated on itself. */
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KR_EXPORT knot_mm_t * mm_ctx_mempool2(size_t chunk_size);
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/*! \brief Delete a memory pool. OK to call on a non-pool. */
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static inline void mm_ctx_delete(knot_mm_t *mm)
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{
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/* The mp_alloc comparison bears a risk of missing the private symbol from knot. */
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if (mm && mm->ctx && mm->alloc == (knot_mm_alloc_t)mp_alloc)
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mp_delete(mm->ctx);
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}
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/*! \brief Readability: avoid const-casts in code. */
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static inline void free_const(const void *what)
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{
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free((void *)what);
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}
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/*! \brief posix_memalign() wrapper. */
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void *mm_malloc_aligned(void *ctx, size_t n);
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/*! \brief Initialize mm with malloc+free with specified alignment (a power of two). */
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static inline void mm_ctx_init_aligned(knot_mm_t *mm, size_t alignment)
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{
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assert(__builtin_popcount(alignment) == 1);
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mm_ctx_init(mm);
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mm->ctx = (uint8_t *)NULL + alignment; /*< roundabout to satisfy linters */
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/* posix_memalign() doesn't allow alignment < sizeof(void*),
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* and there's no point in using it for small values anyway,
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* as plain malloc() guarantees at least max_align_t. */
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if (alignment > sizeof(max_align_t)) {
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mm->alloc = mm_malloc_aligned;
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}
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}
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