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mruby/src/pool.c at master · tomhat/mruby · GitHub
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/*
** pool.c - memory pool
**
** See Copyright Notice in mruby.h
*/
#include
"mruby.h"
#include
<stddef.h>
#include
<string.h>
/* configuration section */
/* allocated memory address should be multiple of POOL_ALIGNMENT */
/* or undef it if alignment does not matter */
#ifndef
POOL_ALIGNMENT
#define
POOL_ALIGNMENT
4
#endif
/* page size of memory pool */
#ifndef
POOL_PAGE_SIZE
#define
POOL_PAGE_SIZE
16000
#endif
/* end of configuration section */
struct
mrb_pool_page
{
struct
mrb_pool_page
*
next
;
size_t
offset
;
size_t
len
;
void
*
last
;
char
page
[
1
];
};
struct
mrb_pool
{
mrb_state
*
mrb
;
struct
mrb_pool_page
*
pages
;
};
#undef
TEST_POOL
#ifdef
TEST_POOL
#define
mrb_malloc
(
m
,
s
) malloc(s)
#define
mrb_free
(
m
,
p
) free(p)
#endif
#ifdef
POOL_ALIGNMENT
# define
ALIGN_PADDING
(
x
) ((-x) & (POOL_ALIGNMENT - 1))
#else
# define
ALIGN_PADDING
(
x
) (0)
#endif
mrb_pool
*
mrb_pool_open
(
mrb_state
*
mrb
)
{
mrb_pool
*
pool
=
(
mrb_pool
*
)
mrb_malloc
(
mrb
,
sizeof
(
mrb_pool
));
if
(
pool
) {
pool
->
mrb
=
mrb
;
pool
->
pages
=
0
;
}
return
pool
;
}
void
mrb_pool_close
(
mrb_pool
*
pool
)
{
struct
mrb_pool_page
*
page
,
*
tmp
;
if
(!
pool
)
return
;
page
=
pool
->
pages
;
while
(
page
) {
tmp
=
page
;
page
=
page
->
next
;
mrb_free
(
pool
->
mrb
,
tmp
);
}
mrb_free
(
pool
->
mrb
,
pool
);
}
static
struct
mrb_pool_page
*
page_alloc
(
mrb_pool
*
pool
,
size_t
len
)
{
struct
mrb_pool_page
*
page
;
if
(
len
<
POOL_PAGE_SIZE
)
len
=
POOL_PAGE_SIZE
;
page
=
(
struct
mrb_pool_page
*
)
mrb_malloc
(
pool
->
mrb
,
sizeof
(
struct
mrb_pool_page
)
+
len
-
1
);
if
(
page
) {
page
->
offset
=
0
;
page
->
len
=
len
;
}
return
page
;
}
void
*
mrb_pool_alloc
(
mrb_pool
*
pool
,
size_t
len
)
{
struct
mrb_pool_page
*
page
;
size_t
n
;
if
(!
pool
)
return
0
;
len
+=
ALIGN_PADDING
(
len
);
page
=
pool
->
pages
;
while
(
page
) {
if
(
page
->
offset
+
len
<=
page
->
len
) {
n
=
page
->
offset
;
page
->
offset
+=
len
;
page
->
last
=
(
char
*
)
page
->
page
+
n
;
return
page
->
last
;
}
page
=
page
->
next
;
}
page
=
page_alloc
(
pool
,
len
);
if
(!
page
)
return
0
;
page
->
offset
=
len
;
page
->
next
=
pool
->
pages
;
pool
->
pages
=
page
;
page
->
last
=
(
void
*
)
page
->
page
;
return
page
->
last
;
}
int
mrb_pool_can_realloc
(
mrb_pool
*
pool
,
void
*
p
,
size_t
len
)
{
struct
mrb_pool_page
*
page
;
if
(!
pool
)
return
FALSE;
len
+=
ALIGN_PADDING
(
len
);
page
=
pool
->
pages
;
while
(
page
) {
if
(
page
->
last
==
p
) {
size_t
beg
;
beg
=
(
char
*
)
p
-
page
->
page
;
if
(
beg
+
len
>
page
->
len
)
return
FALSE;
return
TRUE;
}
page
=
page
->
next
;
}
return
FALSE;
}
void
*
mrb_pool_realloc
(
mrb_pool
*
pool
,
void
*
p
,
size_t
oldlen
,
size_t
newlen
)
{
struct
mrb_pool_page
*
page
;
void
*
np
;
if
(!
pool
)
return
0
;
oldlen
+=
ALIGN_PADDING
(
oldlen
);
newlen
+=
ALIGN_PADDING
(
newlen
);
page
=
pool
->
pages
;
while
(
page
) {
if
(
page
->
last
==
p
) {
size_t
beg
;
beg
=
(
char
*
)
p
-
page
->
page
;
if
(
beg
+
oldlen
!=
page
->
offset
)
break
;
if
(
beg
+
newlen
>
page
->
len
) {
page
->
offset
=
beg
;
break
;
}
page
->
offset
=
beg
+
newlen
;
return
p
;
}
page
=
page
->
next
;
}
np
=
mrb_pool_alloc
(
pool
,
newlen
);
memcpy
(
np
,
p
,
oldlen
);
return
np
;
}
#ifdef
TEST_POOL
int
main
()
{
int
i
,
len
=
250
;
mrb_pool
*
pool
;
void
*
p
;
pool
=
mrb_pool_open
(
0
);
p
=
mrb_pool_alloc
(
pool
,
len
);
for
(
i
=
1
;
i
<
20
;
i
++
) {
printf
(
"%p (len=%d) %d\n"
,
p
,
len
,
mrb_pool_can_realloc
(
pool
,
p
,
len
*
2
));
p
=
mrb_pool_realloc
(
pool
,
p
,
len
,
len
*
2
);
len
*=
2
;
}
mrb_pool_close
(
pool
);
return
0
;
}
#endif
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