112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* get_arena.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: maiboyer <maiboyer@student.42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2024/05/07 09:47:50 by maiboyer #+# #+# */
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/* Updated: 2024/05/08 19:24:47 by maiboyer ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "me/alloc/alloc.h"
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#include "me/alloc/alloc_internal.h"
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#include "me/fs/putendl_fd.h"
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#include "me/fs/putnbr_fd.h"
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#include "me/fs/putstr_fd.h"
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#include "me/mem/mem_set_zero.h"
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#include "me/num/usize.h"
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#include <stdio.h>
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#include <stdlib.h>
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void *__libc_malloc(size_t size);
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t_arena_page *get_head_arena(void)
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{
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static t_arena_page *val = NULL;
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if (val == NULL)
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{
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if (alloc_arena_page(ARENA_SIZE_DEFAULT, &val))
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{
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me_putstr_fd("Error: malloc failed\n", 2);
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exit(1);
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}
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}
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return (val);
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}
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t_error alloc_arena_page(t_usize min_size, t_arena_page **out)
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{
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t_arena_block *block;
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printf("Allocating page with size %zu", min_size);
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min_size = usize_round_up_to(min_size, ARENA_SIZE_DEFAULT);
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if (out == NULL)
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return (ERROR);
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*out = __libc_malloc(sizeof(t_arena_page) + min_size);
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if (*out == NULL)
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return (ERROR);
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mem_set_zero((t_u8 *)*out + sizeof(**out), min_size);
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(*out)->page_size = min_size;
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(*out)->next = NULL;
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block = (t_arena_block *)((t_u8 *)*out + sizeof(**out));
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block->end = true;
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block->used = false;
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block->size = min_size - sizeof(*block);
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return (NO_ERROR);
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}
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t_error get_block_for_page(t_usize size, t_arena_page *page,
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t_arena_block **out)
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{
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t_arena_block *cur;
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t_arena_block *next;
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t_usize leftover;
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if (page == NULL || out == NULL)
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return (ERROR);
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if (page->page_size - sizeof(t_arena_block) <= size)
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return (ERROR);
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cur = (void *)((t_u8 *)page + sizeof(*page));
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while ((t_usize)((t_u8 *)cur - (t_u8 *)page) <
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page->page_size - sizeof(*page))
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{
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if (!cur->used && cur->size >= size)
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{
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if (cur->size > size + sizeof(*cur) * 2)
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{
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leftover = cur->size - size - sizeof(*cur);
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cur->size = size;
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next = (void *)(((t_usize)cur) + size);
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next->size = leftover;
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next->end = cur->end;
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next->used = false;
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cur->end = false;
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}
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*out = cur;
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return (NO_ERROR);
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}
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cur = (void *)((t_u8 *)cur + cur->size + sizeof(*cur));
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}
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return (ERROR);
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}
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void print_pages_info(void)
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{
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t_arena_page *page;
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t_i32 page_nb;
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page = get_head_arena();
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page_nb = 0;
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while (page != NULL)
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{
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me_putstr_fd("Page ", 2);
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me_putnbr_fd(page_nb++, 2);
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me_putstr_fd(" with size ", 2);
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me_putnbr_fd((t_i32)page->page_size, 2);
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me_putstr_fd("\n", 2);
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page = page->next;
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}
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}
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