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124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
/*
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* SPDX-FileCopyrightText: 2006-2016 Matthew Conte
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#pragma once
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#include "tlsf_common.h"
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/*
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** block_header_t member functions.
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*/
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static inline __attribute__((always_inline)) size_t block_size(const block_header_t* block)
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{
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return block->size & ~(block_header_free_bit | block_header_prev_free_bit);
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}
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static inline __attribute__((always_inline)) void block_set_size(block_header_t* block, size_t size)
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{
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const size_t oldsize = block->size;
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block->size = size | (oldsize & (block_header_free_bit | block_header_prev_free_bit));
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}
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static inline __attribute__((always_inline)) int block_is_last(const block_header_t* block)
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{
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return block_size(block) == 0;
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}
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static inline __attribute__((always_inline)) int block_is_free(const block_header_t* block)
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{
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return tlsf_cast(int, block->size & block_header_free_bit);
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}
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static inline __attribute__((always_inline)) void block_set_free(block_header_t* block)
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{
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block->size |= block_header_free_bit;
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}
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static inline __attribute__((always_inline)) void block_set_used(block_header_t* block)
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{
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block->size &= ~block_header_free_bit;
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}
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static inline __attribute__((always_inline)) int block_is_prev_free(const block_header_t* block)
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{
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return tlsf_cast(int, block->size & block_header_prev_free_bit);
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}
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static inline __attribute__((always_inline)) void block_set_prev_free(block_header_t* block)
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{
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block->size |= block_header_prev_free_bit;
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}
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static inline __attribute__((always_inline)) void block_set_prev_used(block_header_t* block)
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{
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block->size &= ~block_header_prev_free_bit;
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}
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static inline __attribute__((always_inline)) block_header_t* block_from_ptr(const void* ptr)
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{
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return tlsf_cast(block_header_t*,
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tlsf_cast(unsigned char*, ptr) - block_start_offset);
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}
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static inline __attribute__((always_inline)) void* block_to_ptr(const block_header_t* block)
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{
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return tlsf_cast(void*,
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tlsf_cast(unsigned char*, block) + block_start_offset);
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}
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/* Return location of next block after block of given size. */
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static inline __attribute__((always_inline)) block_header_t* offset_to_block(const void* ptr, size_t size)
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{
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return tlsf_cast(block_header_t*, tlsf_cast(tlsfptr_t, ptr) + size);
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}
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/* Return location of previous block. */
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static inline __attribute__((always_inline)) block_header_t* block_prev(const block_header_t* block)
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{
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tlsf_assert(block_is_prev_free(block) && "previous block must be free");
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return block->prev_phys_block;
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}
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/* Return location of next existing block. */
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static inline __attribute__((always_inline)) block_header_t* block_next(const block_header_t* block)
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{
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block_header_t* next = offset_to_block(block_to_ptr(block),
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block_size(block) - block_header_overhead);
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tlsf_assert(!block_is_last(block));
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return next;
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}
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/* Link a new block with its physical neighbor, return the neighbor. */
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static inline __attribute__((always_inline)) block_header_t* block_link_next(block_header_t* block)
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{
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block_header_t* next = block_next(block);
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next->prev_phys_block = block;
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return next;
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}
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static inline __attribute__((always_inline)) void block_mark_as_free(block_header_t* block)
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{
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/* Link the block to the next block, first. */
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block_header_t* next = block_link_next(block);
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block_set_prev_free(next);
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block_set_free(block);
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}
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static inline __attribute__((always_inline)) void block_mark_as_used(block_header_t* block)
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{
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block_header_t* next = block_next(block);
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block_set_prev_used(next);
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block_set_used(block);
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}
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#if defined(__cplusplus)
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};
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#endif
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