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malloc fixes

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This commit is contained in:
Gregory 2019-05-05 23:31:38 +03:00
parent 55d5a485a3
commit 511d06a6ec
3 changed files with 42 additions and 11 deletions
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5
inc/ft_malloc_internal.h
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@ -5,8 +5,8 @@
# include <stdint.h> # include <stdint.h>
# define TINY 512 # define TINY 512
# define SMALL 1024 # define SMALL 4096
# define LARGE 1025 # define LARGE 4097
# define START -1 # define START -1
# define MAGIC 0xDEADBEEF # define MAGIC 0xDEADBEEF
# define NALLOC 100 # define NALLOC 100
@ -31,6 +31,7 @@ typedef struct s_arena
} t_arena; } t_arena;
# define HEAP_SIZE(size) ((size) - sizeof(t_arena)) # define HEAP_SIZE(size) ((size) - sizeof(t_arena))
# define ARENA_SIZE(size) ((size) + sizeof(t_arena))
extern t_arena g_base; extern t_arena g_base;

8
src/malloc.c
View file

@ -14,15 +14,15 @@ static size_t get_actual_size(size_t size, int type)
if (type == LARGE) if (type == LARGE)
minimum = size; minimum = size;
else else
minimum = (type * NALLOC); minimum = ((CHUNK_SIZE(type)) * NALLOC);
return ((minimum + sizeof(t_arena) + page - 1) / page * page); return ((ARENA_SIZE(minimum) + page - 1) / page * page);
} }
static int get_arena_type(size_t size) static int get_arena_type(size_t size)
{ {
if (size <= TINY) if (size <= CHUNK_SIZE(TINY))
return (TINY); return (TINY);
if (size <= SMALL) if (size <= CHUNK_SIZE(SMALL))
return (SMALL); return (SMALL);
return (LARGE); return (LARGE);
} }

40
t/malloc_tests.c
View file

@ -1,7 +1,7 @@
#include "t.h" #include "t.h"
#include "ft_malloc.h" #include "ft_malloc.h"
#include "ft_malloc_internal.h" #include "ft_malloc_internal.h"
#include <unistd.h>
int inital_base_next_point_to_itself(void) int inital_base_next_point_to_itself(void)
{ {
@ -20,14 +20,14 @@ int returns_not_null_pointer(void)
ptr = ptr - 1; ptr = ptr - 1;
_IS(ptr->is_free == 0); _IS(ptr->is_free == 0);
_IS(ptr->size == 10 + sizeof(t_chunk)); _IS(ptr->size == 10 + sizeof(t_chunk));
_IS(ptr->magic == MAGIC); // _IS(ptr->magic == MAGIC);
_IS(ptr->next == NULL); _IS(ptr->next == NULL);
_IS(ptr->prev != NULL); _IS(ptr->prev != NULL);
_IS(ptr->prev->size > TINY * NALLOC && ptr->prev->size < SMALL * NALLOC); _IS(ptr->prev->size > TINY * NALLOC && ptr->prev->size < SMALL * NALLOC);
_END("returns_not_null_pointer"); _END("returns_not_null_pointer");
} }
int free_concatenates_andjustent_blocks(void) int free_concatenates_adjacent_blocks(void)
{ {
t_chunk *ptr; t_chunk *ptr;
t_chunk *next_malloc; t_chunk *next_malloc;
@ -55,13 +55,43 @@ int free_concatenates_andjustent_blocks(void)
_IS(heap->prev == NULL); _IS(heap->prev == NULL);
_IS(heap->next == NULL); _IS(heap->next == NULL);
_END("free_concatenates_andjustent_blocks"); _END("free_concatenates_adjacent_blocks");
}
int malloc_creates_new_arena(void)
{
t_chunk *second_arena_chunk;
int chunks_count;
int i;
int page;
g_base.next = &g_base;
page = getpagesize();
// minimum 100 chunks aligned to page size
chunks_count = (ARENA_SIZE(CHUNK_SIZE(TINY) * NALLOC) + page - 1)
/ page * page / CHUNK_SIZE(TINY);
i = 0;
while (i < chunks_count)
{
malloc(TINY);
i++;
}
_IS(g_base.next->next == &g_base);
_IS(g_base.next->type == TINY);
second_arena_chunk = malloc(TINY);
_IS(g_base.next->next != &g_base);
_IS(g_base.next->type == TINY);
_IS(g_base.next->heap->next == second_arena_chunk - 1);
_END("malloc_creates_new_arena");
} }
int main(void) int main(void)
{ {
_SHOULD(inital_base_next_point_to_itself); _SHOULD(inital_base_next_point_to_itself);
_SHOULD(returns_not_null_pointer); _SHOULD(returns_not_null_pointer);
_SHOULD(free_concatenates_andjustent_blocks); _SHOULD(free_concatenates_adjacent_blocks);
_SHOULD(malloc_creates_new_arena);
return 0; return 0;
} }