81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* malloc.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: jhalford <jack@crans.org> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2017/02/17 12:28:02 by jhalford #+# #+# */
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/* Updated: 2017/02/17 13:18:34 by jhalford ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "malloc.h"
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t_node *tiny_zone = NULL;
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t_node *small_zone = NULL;
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t_node *large_zone = NULL;
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t_node *tiny_alloc = NULL;
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t_node *small_alloc = NULL;
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t_node *large_alloc = NULL;
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t_node **find_node(t_node **node, size_t size)
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{
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while (*node && (size_t)(*node)->size < size + HEADER_SIZE)
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node = &(*node)->next;
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return (node);
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}
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void add_chunk(t_node **node_ref, size_t size)
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{
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size_t chunk_size;
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while (*node_ref)
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node_ref = &(*node_ref)->next;
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if (LARGE(size))
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chunk_size = size + HEADER_SIZE;
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else
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chunk_size = TINY(size) ? malloc_N : malloc_M;
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*node_ref = mmap(NULL, chunk_size, PROT_READ|PROT_WRITE,
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MAP_ANON|MAP_PRIVATE, -1, 0);
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(*node_ref)->size = chunk_size;
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(*node_ref)->next = NULL;
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}
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void *split_node(t_node **free, t_node **alloc, size_t size)
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{
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t_node *new_alloc;
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int free_size;
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free_size = (*free)->size;
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new_alloc = *free;
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*(void**)free += (size + HEADER_SIZE);
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(*free)->size = free_size - (size + HEADER_SIZE);
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new_alloc->size = size;
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insert_node(alloc, new_alloc);
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return ((void*)new_alloc + HEADER_SIZE);
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}
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void *malloc(size_t size)
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{
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t_node **zone_ref;
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t_node **alloc_ref;
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t_node **node_ref;
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void *ptr;
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printf("malloc(%zu) was called\n", size);
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if (LARGE(size))
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{
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zone_ref = &large_zone;
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alloc_ref = &large_alloc;
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}
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else
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{
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zone_ref = TINY(size) ? &tiny_zone : &small_zone;
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alloc_ref = TINY(size) ? &tiny_alloc : &small_alloc;
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}
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while (!*(node_ref = find_node(zone_ref, size)))
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add_chunk(node_ref, size);
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ptr = split_node(node_ref, alloc_ref, size);
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return (ptr);
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}
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