#include <unistd.h>
#include "malloc.h"
-#define MIN(x,y) ({ \
- const typeof(x) _x = (x); \
- const typeof(y) _y = (y); \
- (void) (&_x == &_y); \
- _x < _y ? _x : _y; })
-
-
#ifdef __UCLIBC_HAS_THREADS__
#include <pthread.h>
-static pthread_mutex_t malloclock = PTHREAD_MUTEX_INITIALIZER;
-# define LOCK pthread_mutex_lock(&malloclock)
-# define UNLOCK pthread_mutex_unlock(&malloclock);
+pthread_mutex_t __malloclock = PTHREAD_MUTEX_INITIALIZER;
+# define LOCK pthread_mutex_lock(&__malloclock)
+# define UNLOCK pthread_mutex_unlock(&__malloclock);
#else
# define LOCK
# define UNLOCK
#endif
-
-static void * malloc_unlocked (size_t size);
-static void free_unlocked(void *ptr);
-/* How to really get more memory. */
-static void * __morecore(long size);
-/* Pointer to the base of the first block. */
-static char *_heapbase;
+/* Stuff that is shared across .o files */
+/* Pointer to the base of the first block. */
+char *_heapbase;
/* Block information table. */
-static union info *_heapinfo;
-
-/* Number of info entries. */
-static size_t heapsize;
-
+union info *_heapinfo;
/* Search index in the info table. */
-static size_t _heapindex;
-
+size_t _heapindex;
/* Limit of valid info table indices. */
-static size_t _heaplimit;
+size_t _heaplimit;
+/* List of blocks allocated with memalign or valloc */
+struct alignlist *_aligned_blocks;
+
+
+/* Stuff that is local to this .o file only */
+
+/* How to really get more memory. */
+static void * __morecore(long size);
+/* Number of info entries. */
+static size_t heapsize;
/* Count of large blocks allocated for each fragment size. */
static size_t _fragblocks[BLOCKLOG];
-
/* Free lists for each fragment size. */
static struct list _fraghead[BLOCKLOG];
-
/* Are we experienced? */
static int initialized;
-/* List of blocks allocated with memalign or valloc */
-struct alignlist
-{
- struct alignlist *next;
- __ptr_t aligned; /* The address that memaligned returned. */
- __ptr_t exact; /* The address that malloc returned. */
-};
-static struct alignlist *_aligned_blocks;
-
/* Aligned allocation.
* Called within the lock in initialize() and morecore(),
newinfo[BLOCK(oldinfo)].busy.info.size
= BLOCKIFY(heapsize * sizeof (union info));
_heapinfo = newinfo;
- free_unlocked(oldinfo);
+ __free_unlocked(oldinfo);
heapsize = newsize;
}
{
void * ptr;
LOCK;
- ptr = malloc_unlocked(size);
+ ptr = __malloc_unlocked(size);
UNLOCK;
return(ptr);
}
-static void * malloc_unlocked (size_t size)
+void * __malloc_unlocked (size_t size)
{
void *result;
size_t log, block, blocks, i, lastblocks, start;
} else {
/* No free fragments of the desired size, so get a new block
and break it into fragments, returning the first. */
- result = malloc_unlocked(BLOCKSIZE);
+ result = __malloc_unlocked(BLOCKSIZE);
if (!result) {
return NULL;
}
}
}
- free_unlocked(ptr);
+ __free_unlocked(ptr);
UNLOCK;
}
-static void free_unlocked(void *ptr)
+void __free_unlocked(void *ptr)
{
int block, blocks, i, type;
struct list *prev, *next;
next->prev = prev->prev;
_heapinfo[block].busy.type = 0;
_heapinfo[block].busy.info.size = 1;
- free_unlocked(ADDRESS(block));
+ __free_unlocked(ADDRESS(block));
} else if (_heapinfo[block].busy.info.frag.nfree) {
/* If some fragments of this block are free, link this fragment
into the fragment list after the first free fragment of
}
}
-/* Resize the given region to the new size, returning a pointer
- to the (possibly moved) region. This is optimized for speed;
- some benchmarks seem to indicate that greater compactness is
- achieved by unconditionally allocating and copying to a
- new region. */
-void * realloc (void *ptr, size_t size)
-{
- void *result, *previous;
- size_t block, blocks, type;
- size_t oldlimit;
-
- if (!ptr)
- return malloc(size);
- if (!size) {
- LOCK;
- free_unlocked(ptr);
- result = malloc_unlocked(0);
- UNLOCK;
- return(result);
- }
-
- LOCK;
- block = BLOCK(ptr);
-
- switch (type = _heapinfo[block].busy.type) {
- case 0:
- /* Maybe reallocate a large block to a small fragment. */
- if (size <= BLOCKSIZE / 2) {
- if ((result = malloc_unlocked(size)) != NULL) {
- memcpy(result, ptr, size);
- free_unlocked(ptr);
- }
- UNLOCK;
- return result;
- }
-
- /* The new size is a large allocation as well; see if
- we can hold it in place. */
- blocks = BLOCKIFY(size);
- if (blocks < _heapinfo[block].busy.info.size) {
- /* The new size is smaller; return excess memory
- to the free list. */
- _heapinfo[block + blocks].busy.type = 0;
- _heapinfo[block + blocks].busy.info.size
- = _heapinfo[block].busy.info.size - blocks;
- _heapinfo[block].busy.info.size = blocks;
- free_unlocked(ADDRESS(block + blocks));
- UNLOCK;
- return ptr;
- } else if (blocks == _heapinfo[block].busy.info.size) {
- /* No size change necessary. */
- UNLOCK;
- return ptr;
- } else {
- /* Won't fit, so allocate a new region that will. Free
- the old region first in case there is sufficient adjacent
- free space to grow without moving. */
- blocks = _heapinfo[block].busy.info.size;
- /* Prevent free from actually returning memory to the system. */
- oldlimit = _heaplimit;
- _heaplimit = 0;
- free_unlocked(ptr);
- _heaplimit = oldlimit;
- result = malloc_unlocked(size);
- if (!result) {
- /* Now we're really in trouble. We have to unfree
- the thing we just freed. Unfortunately it might
- have been coalesced with its neighbors. */
- if (_heapindex == block)
- malloc_unlocked(blocks * BLOCKSIZE);
- else {
- previous = malloc_unlocked((block - _heapindex) * BLOCKSIZE);
- malloc_unlocked(blocks * BLOCKSIZE);
- free_unlocked(previous);
- }
- UNLOCK;
- return NULL;
- }
- if (ptr != result)
- memmove(result, ptr, blocks * BLOCKSIZE);
- UNLOCK;
- return result;
- }
- break;
-
- default:
- /* Old size is a fragment; type is logarithm to base two of
- the fragment size. */
- if ((size > 1 << (type - 1)) && (size <= 1 << type)) {
- /* New size is the same kind of fragment. */
- UNLOCK;
- return ptr;
- }
- else {
- /* New size is different; allocate a new space, and copy
- the lesser of the new size and the old. */
- result = malloc_unlocked(size);
- if (!result) {
- UNLOCK;
- return NULL;
- }
- memcpy(result, ptr, MIN(size, (size_t)(1 << type)));
- free_unlocked(ptr);
- UNLOCK;
- return result;
- }
- break;
- }
- UNLOCK;
-}
-
-__ptr_t memalign (size_t alignment, size_t size)
-{
- __ptr_t result;
- unsigned long int adj;
-
- result = malloc (size + alignment - 1);
- if (result == NULL)
- return NULL;
- adj = (unsigned long int) ((unsigned long int) ((char *) result -
- (char *) NULL)) % alignment;
- if (adj != 0)
- {
- struct alignlist *l;
- LOCK;
- for (l = _aligned_blocks; l != NULL; l = l->next)
- if (l->aligned == NULL)
- /* This slot is free. Use it. */
- break;
- if (l == NULL)
- {
- l = (struct alignlist *) malloc (sizeof (struct alignlist));
- if (l == NULL) {
- free_unlocked (result);
- UNLOCK;
- return NULL;
- }
- l->next = _aligned_blocks;
- _aligned_blocks = l;
- }
- l->exact = result;
- result = l->aligned = (char *) result + alignment - adj;
- UNLOCK;
- }
-
- return result;
-}
-
--- /dev/null
+/* malloc.c - C standard library routine.
+ Copyright (c) 1989, 1993 Michael J. Haertel
+ You may redistribute this library under the terms of the
+ GNU Library General Public License (version 2 or any later
+ version) as published by the Free Software Foundation.
+ THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY EXPRESS OR IMPLIED
+ WARRANTY. IN PARTICULAR, THE AUTHOR MAKES NO REPRESENTATION OR
+ WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY OF THIS
+ SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. */
+
+#define _GNU_SOURCE
+#include <features.h>
+#include <limits.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "malloc.h"
+
+#ifdef __UCLIBC_HAS_THREADS__
+#include <pthread.h>
+extern pthread_mutex_t __malloclock;
+# define LOCK pthread_mutex_lock(&__malloclock)
+# define UNLOCK pthread_mutex_unlock(&__malloclock);
+#else
+# define LOCK
+# define UNLOCK
+#endif
+
+
+__ptr_t memalign (size_t alignment, size_t size)
+{
+ __ptr_t result;
+ unsigned long int adj;
+
+ result = malloc (size + alignment - 1);
+ if (result == NULL)
+ return NULL;
+ adj = (unsigned long int) ((unsigned long int) ((char *) result -
+ (char *) NULL)) % alignment;
+ if (adj != 0)
+ {
+ struct alignlist *l;
+ LOCK;
+ for (l = _aligned_blocks; l != NULL; l = l->next)
+ if (l->aligned == NULL)
+ /* This slot is free. Use it. */
+ break;
+ if (l == NULL)
+ {
+ l = (struct alignlist *) malloc (sizeof (struct alignlist));
+ if (l == NULL) {
+ __free_unlocked (result);
+ UNLOCK;
+ return NULL;
+ }
+ l->next = _aligned_blocks;
+ _aligned_blocks = l;
+ }
+ l->exact = result;
+ result = l->aligned = (char *) result + alignment - adj;
+ UNLOCK;
+ }
+
+ return result;
+}
+
--- /dev/null
+/* malloc.c - C standard library routine.
+ Copyright (c) 1989, 1993 Michael J. Haertel
+ You may redistribute this library under the terms of the
+ GNU Library General Public License (version 2 or any later
+ version) as published by the Free Software Foundation.
+ THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY EXPRESS OR IMPLIED
+ WARRANTY. IN PARTICULAR, THE AUTHOR MAKES NO REPRESENTATION OR
+ WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY OF THIS
+ SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. */
+
+#define _GNU_SOURCE
+#include <features.h>
+#include <limits.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "malloc.h"
+
+#ifdef __UCLIBC_HAS_THREADS__
+#include <pthread.h>
+extern pthread_mutex_t __malloclock;
+# define LOCK pthread_mutex_lock(&__malloclock)
+# define UNLOCK pthread_mutex_unlock(&__malloclock);
+#else
+# define LOCK
+# define UNLOCK
+#endif
+
+/* Resize the given region to the new size, returning a pointer
+ to the (possibly moved) region. This is optimized for speed;
+ some benchmarks seem to indicate that greater compactness is
+ achieved by unconditionally allocating and copying to a
+ new region. */
+void * realloc (void *ptr, size_t size)
+{
+ void *result, *previous;
+ size_t block, blocks, type;
+ size_t oldlimit;
+
+ if (!ptr)
+ return malloc(size);
+ if (!size) {
+ LOCK;
+ __free_unlocked(ptr);
+ result = __malloc_unlocked(0);
+ UNLOCK;
+ return(result);
+ }
+
+ LOCK;
+ block = BLOCK(ptr);
+
+ switch (type = _heapinfo[block].busy.type) {
+ case 0:
+ /* Maybe reallocate a large block to a small fragment. */
+ if (size <= BLOCKSIZE / 2) {
+ if ((result = __malloc_unlocked(size)) != NULL) {
+ memcpy(result, ptr, size);
+ __free_unlocked(ptr);
+ }
+ UNLOCK;
+ return result;
+ }
+
+ /* The new size is a large allocation as well; see if
+ we can hold it in place. */
+ blocks = BLOCKIFY(size);
+ if (blocks < _heapinfo[block].busy.info.size) {
+ /* The new size is smaller; return excess memory
+ to the free list. */
+ _heapinfo[block + blocks].busy.type = 0;
+ _heapinfo[block + blocks].busy.info.size
+ = _heapinfo[block].busy.info.size - blocks;
+ _heapinfo[block].busy.info.size = blocks;
+ __free_unlocked(ADDRESS(block + blocks));
+ UNLOCK;
+ return ptr;
+ } else if (blocks == _heapinfo[block].busy.info.size) {
+ /* No size change necessary. */
+ UNLOCK;
+ return ptr;
+ } else {
+ /* Won't fit, so allocate a new region that will. Free
+ the old region first in case there is sufficient adjacent
+ free space to grow without moving. */
+ blocks = _heapinfo[block].busy.info.size;
+ /* Prevent free from actually returning memory to the system. */
+ oldlimit = _heaplimit;
+ _heaplimit = 0;
+ __free_unlocked(ptr);
+ _heaplimit = oldlimit;
+ result = __malloc_unlocked(size);
+ if (!result) {
+ /* Now we're really in trouble. We have to unfree
+ the thing we just freed. Unfortunately it might
+ have been coalesced with its neighbors. */
+ if (_heapindex == block)
+ __malloc_unlocked(blocks * BLOCKSIZE);
+ else {
+ previous = __malloc_unlocked((block - _heapindex) * BLOCKSIZE);
+ __malloc_unlocked(blocks * BLOCKSIZE);
+ __free_unlocked(previous);
+ }
+ UNLOCK;
+ return NULL;
+ }
+ if (ptr != result)
+ memmove(result, ptr, blocks * BLOCKSIZE);
+ UNLOCK;
+ return result;
+ }
+ break;
+
+ default:
+ /* Old size is a fragment; type is logarithm to base two of
+ the fragment size. */
+ if ((size > 1 << (type - 1)) && (size <= 1 << type)) {
+ /* New size is the same kind of fragment. */
+ UNLOCK;
+ return ptr;
+ }
+ else {
+ /* New size is different; allocate a new space, and copy
+ the lesser of the new size and the old. */
+ result = __malloc_unlocked(size);
+ if (!result) {
+ UNLOCK;
+ return NULL;
+ }
+ memcpy(result, ptr, MIN(size, (size_t)(1 << type)));
+ __free_unlocked(ptr);
+ UNLOCK;
+ return result;
+ }
+ break;
+ }
+ UNLOCK;
+}
+
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