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-rw-r--r--debian/config3
-rw-r--r--extra/Configs/Config.in28
-rw-r--r--libc/stdlib/Makefile9
-rw-r--r--libc/stdlib/malloc-930716/README40
-rw-r--r--libc/stdlib/malloc-930716/malloc.c445
-rw-r--r--libc/stdlib/malloc-930716/malloc.h89
-rw-r--r--libc/stdlib/malloc-930716/memalign.c67
-rw-r--r--libc/stdlib/malloc-930716/realloc.c142
-rw-r--r--libc/stdlib/malloc-simple/alloc.c29
-rw-r--r--libc/stdlib/malloc-standard/Makefile (renamed from libc/stdlib/malloc-930716/Makefile)11
-rw-r--r--libc/stdlib/malloc-standard/calloc.c93
-rw-r--r--libc/stdlib/malloc-standard/free.c382
-rw-r--r--libc/stdlib/malloc-standard/mallinfo.c81
-rw-r--r--libc/stdlib/malloc-standard/malloc.c1160
-rw-r--r--libc/stdlib/malloc-standard/malloc.h953
-rw-r--r--libc/stdlib/malloc-standard/mallopt.c64
-rw-r--r--libc/stdlib/malloc-standard/memalign.c126
-rw-r--r--libc/stdlib/malloc-standard/realloc.c237
-rw-r--r--libc/stdlib/malloc/Makefile3
-rw-r--r--libc/stdlib/malloc/calloc.c (renamed from libc/stdlib/calloc.c)0
20 files changed, 3155 insertions, 807 deletions
diff --git a/debian/config b/debian/config
index b1c32ab81..487198a72 100644
--- a/debian/config
+++ b/debian/config
@@ -45,7 +45,8 @@ UCLIBC_HAS_THREADS=y
PTHREADS_DEBUG_SUPPORT=y
UCLIBC_HAS_LFS=y
# MALLOC is not set
-MALLOC_930716=y
+# MALLOC_SIMPLE is not set
+MALLOC_STANDARD=y
MALLOC_GLIBC_COMPAT=y
UCLIBC_DYNAMIC_ATEXIT=y
HAS_SHADOW=y
diff --git a/extra/Configs/Config.in b/extra/Configs/Config.in
index 151d60216..8f5eee439 100644
--- a/extra/Configs/Config.in
+++ b/extra/Configs/Config.in
@@ -287,24 +287,36 @@ config UCLIBC_HAS_LFS
choice
prompt "Malloc Implementation"
- default MALLOC_930716
+ default MALLOC if ! UCLIBC_HAS_MMU
+ default MALLOC_STANDARD if UCLIBC_HAS_MMU
help
"malloc" use mmap for all allocations and so works very well on MMU-less
systems that do not support the brk() system call. It is pretty smart
about reusing already allocated memory, and minimizing memory wastage.
+ This is the default for uClinux MMU-less systems.
- "malloc-930716" is derived from libc-5.3.12 and uses the brk() system call
- for all memory allocations. This makes it very fast. It is also pretty
- smart about reusing already allocated memory, and minimizing memory wastage.
- Because this uses brk() it will not work on uClinux MMU-less systems.
+ "malloc-simple" was written from scratch for uClibc, and is the
+ simplest possible (and therefore smallest) malloc implementation.
+ It is rather dumb, and certainly isn't the fastest. But it is 100%
+ standards compliant, thread safe, and very small.
- If unsure, answer "malloc".
+ "malloc-standard" is derived from the public domain dlmalloc
+ implementation by Doug Lea. It is quite fast, and is pretty smart
+ about reusing already allocated memory, and minimizing memory
+ wastage. This uses brk() for small allocations, while using mmap()
+ for larger allocations. This is the default malloc implementation
+ for uClibc.
+
+ If unsure, answer "malloc-standard".
config MALLOC
bool "malloc"
-config MALLOC_930716
- bool "malloc-930716"
+config MALLOC_SIMPLE
+ bool "malloc-simple"
+
+config MALLOC_STANDARD
+ bool "malloc-standard"
depends on UCLIBC_HAS_MMU
endchoice
diff --git a/libc/stdlib/Makefile b/libc/stdlib/Makefile
index a22a8eb0a..878d2bd03 100644
--- a/libc/stdlib/Makefile
+++ b/libc/stdlib/Makefile
@@ -28,8 +28,11 @@ DIRS:=
ifeq ($(MALLOC),y)
DIRS+=malloc
endif
-ifeq ($(MALLOC_930716),y)
- DIRS+=malloc-930716
+ifeq ($(MALLOC_SIMPLE),y)
+ DIRS+=malloc-simple
+endif
+ifeq ($(MALLOC_STANDARD),y)
+ DIRS+=malloc-standard
endif
@@ -83,7 +86,7 @@ CSRC = abort.c getenv.c mkdtemp.c mktemp.c realpath.c mkstemp.c mkstemp64.c \
ptsname.c grantpt.c unlockpt.c gcvt.c drand48-iter.c jrand48.c \
jrand48_r.c lrand48.c lrand48_r.c mrand48.c mrand48_r.c nrand48.c \
nrand48_r.c rand_r.c srand48.c srand48_r.c seed48.c seed48_r.c \
- calloc.c valloc.c
+ valloc.c
ifeq ($(UCLIBC_HAS_FLOATS),y)
CSRC += drand48.c drand48_r.c erand48.c erand48_r.c
endif
diff --git a/libc/stdlib/malloc-930716/README b/libc/stdlib/malloc-930716/README
deleted file mode 100644
index 39c048312..000000000
--- a/libc/stdlib/malloc-930716/README
+++ /dev/null
@@ -1,40 +0,0 @@
-This is a fast malloc implementation that I wrote several years ago.
-I later used it as the basis of GNU malloc. My version differs from
-the GNU version in that it does not support debugging hooks, and does
-not record statistics. Therefore it is slightly faster.
-
-In order to safely link programs using this malloc with a C library
-that provides a different malloc, you need to make sure that
-malloc(), free(), and realloc() are defined in a single object file.
-Otherwise when linking you might get a combination of this malloc()
-with the library's free(). The Makefile builds such an object file,
-alloc.o.
-
-If you are using this malloc as the allocator for a C library of your
-own, and are not linking with another C library, then you don't need
-alloc.o. If you are building a C library, you should also write a
-replacement for the file "morecore.c" that doesn't pollute the name
-space.
-
-The header file "malloc.h" in this directory is NOT intended to be a
-public header file; it is for internal use by malloc and its
-friends. Don't install malloc.h in a public include directory!
-
-When porting this allocator to a new machine or operating system, you
-should inspect the definition of BLOCKSIZE in malloc.h to make sure
-it is greater than or equal to your target machine's virtual memory
-page size; otherwise valloc() won't work properly. (If you don't
-care about valloc() then BLOCKSIZE doesn't matter.)
-
-You will also need to provide a machine-dependent _default_morecore()
-function; see morecore.c for a sample version that works on Unix.
-Your morecore function should return a pointer to a newly allocated
-region of the given size, aligned on the most pessimistic alignment
-boundary for the machine. Subsequent calls to morecore should return
-contiguous memory, and calls to morecore with a negative argument
-should return memory to the system. If no memory is available
-morecore should return NULL.
-
-Bug reports to Mike Haertel, mike@cs.uoregon.edu.
-This version is dated March 26, 1993; include this
-date with your bug report.
diff --git a/libc/stdlib/malloc-930716/malloc.c b/libc/stdlib/malloc-930716/malloc.c
deleted file mode 100644
index 14047cb02..000000000
--- a/libc/stdlib/malloc-930716/malloc.c
+++ /dev/null
@@ -1,445 +0,0 @@
-/* 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 <errno.h>
-#include "malloc.h"
-
-#ifdef __UCLIBC_HAS_THREADS__
-#include <pthread.h>
-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
-
-
-/* Stuff that is shared across .o files */
-
-/* Pointer to the base of the first block. */
-char *_heapbase;
-/* Block information table. */
-union info *_heapinfo;
-/* Search index in the info table. */
-size_t _heapindex;
-/* Limit of valid info table indices. */
-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;
-
-
-/* Aligned allocation.
- * Called within the lock in initialize() and morecore(),
- * so no explicit locking needed... */
-static void * align(size_t size)
-{
- void *result;
- unsigned int adj;
-
- result = __morecore(size);
- adj = (unsigned int) ((char *) result - (char *) NULL) % BLOCKSIZE;
- if (adj != 0) {
- __morecore(adj = BLOCKSIZE - adj);
- result = (char *) result + adj;
- }
- return result;
-}
-
-/* Set everything up and remember that we have.
- * Called within the lock in malloc(), so no
- * explicit locking needed... */
-static int initialize(void)
-{
- heapsize = HEAP / BLOCKSIZE;
- _heapinfo = align(heapsize * sizeof (union info));
- if (!_heapinfo) {
- return 0;
- }
- memset(_heapinfo, 0, heapsize * sizeof (union info));
- _heapinfo[0].free.size = 0;
- _heapinfo[0].free.next = _heapinfo[0].free.prev = 0;
- _heapindex = 0;
- _heapbase = (char *) _heapinfo;
- initialized = 1;
- return 1;
-}
-
-/* Get neatly aligned memory, initializing or growing the
- * heap info table as necessary.
- * Called within a lock in malloc() and free(),
- * so no explicit locking needed... */
-static void * morecore(size_t size)
-{
- void *result;
- union info *newinfo, *oldinfo;
- size_t newsize;
-
- result = align(size);
- if (!result)
- return NULL;
-
- /* Check if we need to grow the info table. */
- if (BLOCK((char *) result + size) > heapsize) {
- newsize = heapsize;
- while (BLOCK((char *) result + size) > newsize)
- newsize *= 2;
- newinfo = align(newsize * sizeof (union info));
- if (!newinfo) {
- __morecore(-size);
- return NULL;
- }
- memset(newinfo, 0, newsize * sizeof (union info));
- memcpy(newinfo, _heapinfo, heapsize * sizeof (union info));
- oldinfo = _heapinfo;
- newinfo[BLOCK(oldinfo)].busy.type = 0;
- newinfo[BLOCK(oldinfo)].busy.info.size
- = BLOCKIFY(heapsize * sizeof (union info));
- _heapinfo = newinfo;
- __free_unlocked(oldinfo);
- heapsize = newsize;
- }
-
- _heaplimit = BLOCK((char *) result + size);
- return result;
-}
-
-/* Note that morecore has to take a signed argument so
- that negative values can return memory to the system. */
-static void * __morecore(long size)
-{
- void *result;
-
- result = sbrk(size);
- if (result == (void *) -1)
- return NULL;
- return result;
-}
-
-/* Allocate memory from the heap. */
-void * malloc (size_t size)
-{
- void * ptr;
- LOCK;
- ptr = __malloc_unlocked(size);
- UNLOCK;
- return(ptr);
-}
-
-void * __malloc_unlocked (size_t size)
-{
- void *result;
- size_t log, block, blocks, i, lastblocks, start;
- struct list *next;
-
-#if defined(__MALLOC_GLIBC_COMPAT__)
- if (unlikely(size == 0))
- size++;
-#else
- /* Some programs will call malloc (0). Lets be strict and return NULL */
- if (unlikely(size == 0))
- return 0;
-#endif
- /* Check if they are doing something dumb like malloc(-1) */
- if (unlikely(((unsigned long)size > (unsigned long)(sizeof (struct list)*-2))))
- goto oom;
-
- if (unlikely(size < sizeof (struct list)))
- size = sizeof (struct list);
-
- if (!initialized && !initialize()) {
- goto oom;
- }
-
- /* Determine the allocation policy based on the request size. */
- if (size <= BLOCKSIZE / 2) {
- /* Small allocation to receive a fragment of a block. Determine
- the logarithm to base two of the fragment size. */
- --size;
- for (log = 1; (size >>= 1) != 0; ++log)
- ;
-
- /* Look in the fragment lists for a free fragment of the
- desired size. */
- if ((next = _fraghead[log].next) != 0) {
- /* There are free fragments of this size. Pop a fragment
- out of the fragment list and return it. Update the block's
- nfree and first counters. */
- result = next;
- next->prev->next = next->next;
- if (next->next)
- next->next->prev = next->prev;
- block = BLOCK(result);
- if (--_heapinfo[block].busy.info.frag.nfree)
- _heapinfo[block].busy.info.frag.first
- = (unsigned int) ((char *) next->next - (char *) NULL)
- % BLOCKSIZE >> log;
- } 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);
- if (!result) {
- goto oom;
- }
- ++_fragblocks[log];
-
- /* Link all fragments but the first into the free list. */
- next = (struct list *) ((char *) result + (1 << log));
- next->next = 0;
- next->prev = &_fraghead[log];
- _fraghead[log].next = next;
-
- for (i = 2; i < BLOCKSIZE >> log; ++i) {
- next = (struct list *) ((char *) result + (i << log));
- next->next = _fraghead[log].next;
- next->prev = &_fraghead[log];
- next->prev->next = next;
- next->next->prev = next;
- }
-
- /* Initialize the nfree and first counters for this block. */
- block = BLOCK(result);
- _heapinfo[block].busy.type = log;
- _heapinfo[block].busy.info.frag.nfree = i - 1;
- _heapinfo[block].busy.info.frag.first = i - 1;
- }
- } else {
- /* Large allocation to receive one or more blocks. Search
- the free list in a circle starting at the last place visited.
- If we loop completely around without finding a large enough
- space we will have to get more memory from the system. */
- blocks = BLOCKIFY(size);
- start = block = _heapindex;
- while (_heapinfo[block].free.size < blocks) {
- block = _heapinfo[block].free.next;
- if (block == start) {
- /* Need to get more from the system. Check to see if
- the new core will be contiguous with the final free
- block; if so we don't need to get as much. */
- block = _heapinfo[0].free.prev;
- lastblocks = _heapinfo[block].free.size;
- if (_heaplimit && block + lastblocks == _heaplimit
- && __morecore(0) == ADDRESS(block + lastblocks)
- && morecore((blocks - lastblocks) * BLOCKSIZE)) {
- /* Note that morecore() can change the location of
- the final block if it moves the info table and the
- old one gets coalesced into the final block. */
- block = _heapinfo[0].free.prev;
- _heapinfo[block].free.size += blocks - lastblocks;
- continue;
- }
- result = morecore(blocks * BLOCKSIZE);
- if (!result) {
- goto oom;
- }
- block = BLOCK(result);
- _heapinfo[block].busy.type = 0;
- _heapinfo[block].busy.info.size = blocks;
- return result;
- }
- }
-
- /* At this point we have found a suitable free list entry.
- Figure out how to remove what we need from the list. */
- result = ADDRESS(block);
- if (_heapinfo[block].free.size > blocks) {
- /* The block we found has a bit left over, so relink the
- tail end back into the free list. */
- _heapinfo[block + blocks].free.size
- = _heapinfo[block].free.size - blocks;
- _heapinfo[block + blocks].free.next
- = _heapinfo[block].free.next;
- _heapinfo[block + blocks].free.prev
- = _heapinfo[block].free.prev;
- _heapinfo[_heapinfo[block].free.prev].free.next
- = _heapinfo[_heapinfo[block].free.next].free.prev
- = _heapindex = block + blocks;
- } else {
- /* The block exactly matches our requirements, so
- just remove it from the list. */
- _heapinfo[_heapinfo[block].free.next].free.prev
- = _heapinfo[block].free.prev;
- _heapinfo[_heapinfo[block].free.prev].free.next
- = _heapindex = _heapinfo[block].free.next;
- }
-
- _heapinfo[block].busy.type = 0;
- _heapinfo[block].busy.info.size = blocks;
- }
-
- return result;
-
-oom:
- __set_errno(ENOMEM);
- return NULL;
-}
-
-/* Return memory to the heap. */
-void free(void *ptr)
-{
- struct alignlist *l;
-
- if (ptr == NULL)
- return;
-
- LOCK;
- for (l = _aligned_blocks; l != NULL; l = l->next) {
- if (l->aligned == ptr) {
- /* Mark the block as free */
- l->aligned = NULL;
- ptr = l->exact;
- break;
- }
- }
-
- __free_unlocked(ptr);
- UNLOCK;
-}
-
-void __free_unlocked(void *ptr)
-{
- int block, blocks, i, type;
- struct list *prev, *next;
-
- if (ptr == NULL)
- return;
-
-
- block = BLOCK(ptr);
-
- switch (type = _heapinfo[block].busy.type) {
- case 0:
- /* Find the free cluster previous to this one in the free list.
- Start searching at the last block referenced; this may benefit
- programs with locality of allocation. */
- i = _heapindex;
- if (i > block)
- while (i > block)
- i = _heapinfo[i].free.prev;
- else {
- do
- i = _heapinfo[i].free.next;
- while (i > 0 && i < block);
- i = _heapinfo[i].free.prev;
- }
-
- /* Determine how to link this block into the free list. */
- if (block == i + _heapinfo[i].free.size) {
- /* Coalesce this block with its predecessor. */
- _heapinfo[i].free.size += _heapinfo[block].busy.info.size;
- block = i;
- } else {
- /* Really link this block back into the free list. */
- _heapinfo[block].free.size = _heapinfo[block].busy.info.size;
- _heapinfo[block].free.next = _heapinfo[i].free.next;
- _heapinfo[block].free.prev = i;
- _heapinfo[i].free.next = block;
- _heapinfo[_heapinfo[block].free.next].free.prev = block;
- }
-
- /* Now that the block is linked in, see if we can coalesce it
- with its successor (by deleting its successor from the list
- and adding in its size). */
- if (block + _heapinfo[block].free.size == _heapinfo[block].free.next) {
- _heapinfo[block].free.size
- += _heapinfo[_heapinfo[block].free.next].free.size;
- _heapinfo[block].free.next
- = _heapinfo[_heapinfo[block].free.next].free.next;
- _heapinfo[_heapinfo[block].free.next].free.prev = block;
- }
-
- /* Now see if we can return stuff to the system. */
- blocks = _heapinfo[block].free.size;
- if (blocks >= FINAL_FREE_BLOCKS && block + blocks == _heaplimit
- && __morecore(0) == ADDRESS(block + blocks)) {
- _heaplimit -= blocks;
- __morecore(-blocks * BLOCKSIZE);
- _heapinfo[_heapinfo[block].free.prev].free.next
- = _heapinfo[block].free.next;
- _heapinfo[_heapinfo[block].free.next].free.prev
- = _heapinfo[block].free.prev;
- block = _heapinfo[block].free.prev;
- }
-
- /* Set the next search to begin at this block. */
- _heapindex = block;
- break;
-
- default:
- /* Get the address of the first free fragment in this block. */
- prev = (struct list *) ((char *) ADDRESS(block)
- + (_heapinfo[block].busy.info.frag.first
- << type));
-
- if (_heapinfo[block].busy.info.frag.nfree == (BLOCKSIZE >> type) - 1
- && _fragblocks[type] > 1) {
- /* If all fragments of this block are free, remove them
- from the fragment list and free the whole block. */
- --_fragblocks[type];
- for (next = prev, i = 1; i < BLOCKSIZE >> type; ++i)
- next = next->next;
- prev->prev->next = next;
- if (next)
- next->prev = prev->prev;
- _heapinfo[block].busy.type = 0;
- _heapinfo[block].busy.info.size = 1;
- __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
- this block. */
- next = ptr;
- next->next = prev->next;
- next->prev = prev;
- prev->next = next;
- if (next->next)
- next->next->prev = next;
- ++_heapinfo[block].busy.info.frag.nfree;
- } else {
- /* No fragments of this block are free, so link this fragment
- into the fragment list and announce that it is the first
- free fragment of this block. */
- prev = (struct list *) ptr;
- _heapinfo[block].busy.info.frag.nfree = 1;
- _heapinfo[block].busy.info.frag.first
- = (unsigned int) ((char *) ptr - (char *) NULL) % BLOCKSIZE
- >> type;
- prev->next = _fraghead[type].next;
- prev->prev = &_fraghead[type];
- prev->prev->next = prev;
- if (prev->next)
- prev->next->prev = prev;
- }
- break;
- }
-}
-
diff --git a/libc/stdlib/malloc-930716/malloc.h b/libc/stdlib/malloc-930716/malloc.h
deleted file mode 100644
index bd315f788..000000000
--- a/libc/stdlib/malloc-930716/malloc.h
+++ /dev/null
@@ -1,89 +0,0 @@
-/* malloc.h - declarations for the allocator.
- 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. */
-
-#include <sys/cdefs.h>
-
-
-#define MIN(x,y) ({ \
- const typeof(x) _x = (x); \
- const typeof(y) _y = (y); \
- (void) (&_x == &_y); \
- _x < _y ? _x : _y; })
-
-
-
-/* The allocator divides the heap into blocks of fixed size; large
- requests receive one or more whole blocks, and small requests
- receive a fragment of a block. Fragment sizes are powers of two,
- and all fragments of a block are the same size. When all the
- fragments in a block have been freed, the block itself is freed.
- */
-#define INT_BIT (CHAR_BIT * sizeof (size_t))
-#define BLOCKLOG (INT_BIT > 16 ? 12 : 9)
-#define BLOCKSIZE (1 << BLOCKLOG)
-#define BLOCKIFY(SIZE) (((SIZE) + BLOCKSIZE - 1) / BLOCKSIZE)
-
-/* Determine the amount of memory spanned by the initial heap table
- (not an absolute limit). */
-#define HEAP (INT_BIT > 16 ? 4194304 : 65536)
-
-/* Number of contiguous free blocks allowed to build up at the end of
- memory before they will be returned to the system. */
-#define FINAL_FREE_BLOCKS 8
-
-/* Data structure giving per-block information. */
-union info {
- struct {
- size_t type; /* Zero for a large block, or positive
- giving the logarithm to the base two
- of the fragment size. */
- union {
- struct {
- size_t nfree; /* Free fragments in a fragmented block. */
- size_t first; /* First free fragment of the block. */
- } frag;
- size_t size; /* Size (in blocks) of a large cluster. */
- } info;
- } busy;
- struct {
- size_t size; /* Size (in blocks) of a free cluster. */
- size_t next; /* Index of next free cluster. */
- size_t prev; /* Index of previous free cluster. */
- } free;
-};
-
-/* Address to block number and vice versa. */
-#define BLOCK(A) (((char *) (A) - _heapbase) / BLOCKSIZE + 1)
-#define ADDRESS(B) ((void *) (((B) - 1) * BLOCKSIZE + _heapbase))
-
-/* Doubly linked lists of free fragments. */
-struct list {
- struct list *next;
- struct list *prev;
-};
-
-/* 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. */
-};
-extern struct alignlist *_aligned_blocks;
-extern char *_heapbase;
-extern union info *_heapinfo;
-extern size_t _heapindex;
-extern size_t _heaplimit;
-
-
-extern void *__malloc_unlocked (size_t size);
-extern void __free_unlocked(void *ptr);
-
-
diff --git a/libc/stdlib/malloc-930716/memalign.c b/libc/stdlib/malloc-930716/memalign.c
deleted file mode 100644
index b89165452..000000000
--- a/libc/stdlib/malloc-930716/memalign.c
+++ /dev/null
@@ -1,67 +0,0 @@
-/* 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;
-}
-
diff --git a/libc/stdlib/malloc-930716/realloc.c b/libc/stdlib/malloc-930716/realloc.c
deleted file mode 100644
index 397534a5a..000000000
--- a/libc/stdlib/malloc-930716/realloc.c
+++ /dev/null
@@ -1,142 +0,0 @@
-/* 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 <errno.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);
- goto alldone;
- }
-
- 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);
- }
- goto alldone;
- }
-
- /* 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));
- result = ptr;
- goto alldone;
- } else if (blocks == _heapinfo[block].busy.info.size) {
- /* No size change necessary. */
- result = ptr;
- goto alldone;
- } 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);
- }
- goto oom;
- }
- if (ptr != result)
- memmove(result, ptr, blocks * BLOCKSIZE);
- goto alldone;
- }
- 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. */
- result = ptr;
- goto alldone;
- }
- 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) {
- goto oom;
- }
- memcpy(result, ptr, MIN(size, (size_t)(1 << type)));
- __free_unlocked(ptr);
- goto alldone;
- }
- break;
- }
-alldone:
- UNLOCK;
- return result;
-
-oom:
- UNLOCK;
- __set_errno(ENOMEM);
- return NULL;
-}
-
diff --git a/libc/stdlib/malloc-simple/alloc.c b/libc/stdlib/malloc-simple/alloc.c
index ee0135581..fcac02927 100644
--- a/libc/stdlib/malloc-simple/alloc.c
+++ b/libc/stdlib/malloc-simple/alloc.c
@@ -31,14 +31,14 @@ void *malloc(size_t size)
#ifdef __UCLIBC_HAS_MMU__
result = mmap((void *) 0, size + sizeof(size_t), PROT_READ | PROT_WRITE,
- MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (result == MAP_FAILED)
return 0;
* (size_t *) result = size;
return(result + sizeof(size_t));
#else
result = mmap((void *) 0, size, PROT_READ | PROT_WRITE,
- MAP_SHARED | MAP_ANONYMOUS, 0, 0);
+ MAP_SHARED | MAP_ANONYMOUS, -1, 0);
if (result == MAP_FAILED)
return 0;
return(result);
@@ -47,12 +47,27 @@ void *malloc(size_t size)
#endif
#ifdef L_calloc
-void *calloc(size_t num, size_t size)
+void * calloc(size_t nmemb, size_t lsize)
{
- void *ptr = malloc(num * size);
- if (ptr)
- memset(ptr, 0, num * size);
- return ptr;
+ void *result;
+ size_t size=lsize * nmemb;
+
+ /* guard vs integer overflow, but allow nmemb
+ * to fall through and call malloc(0) */
+ if (nmemb && lsize != (size / nmemb)) {
+ __set_errno(ENOMEM);
+ return NULL;
+ }
+ result=malloc(size);
+#if 0
+ /* Standard unix mmap using /dev/zero clears memory so calloc
+ * doesn't need to actually zero anything....
+ */
+ if (result != NULL) {
+ memset(result, 0, size);
+ }
+#endif
+ return result;
}
#endif
diff --git a/libc/stdlib/malloc-930716/Makefile b/libc/stdlib/malloc-standard/Makefile
index bd52b21e9..2b87c5de2 100644
--- a/libc/stdlib/malloc-930716/Makefile
+++ b/libc/stdlib/malloc-standard/Makefile
@@ -24,9 +24,14 @@
TOPDIR=../../../
include $(TOPDIR)Rules.mak
-# calloc.c can be found at uClibc/libc/stdlib/calloc.c
-# valloc.c can be found at uClibc/libc/stdlib/valloc.c
-CSRC=malloc.c memalign.c realloc.c
+# Turn on malloc debugging if requested
+ifeq ($(UCLIBC_MALLOC_DEBUGGING),y)
+CFLAGS += -D__MALLOC_DEBUGGING
+endif
+
+# calloc.c can be found at uClibc/libc/stdlib/calloc.c
+# valloc.c can be found at uClibc/libc/stdlib/valloc.c
+CSRC=malloc.c calloc.c realloc.c free.c memalign.c mallopt.c mallinfo.c
COBJS=$(patsubst %.c,%.o, $(CSRC))
OBJS=$(COBJS)
diff --git a/libc/stdlib/malloc-standard/calloc.c b/libc/stdlib/malloc-standard/calloc.c
new file mode 100644
index 000000000..cff0adab8
--- /dev/null
+++ b/libc/stdlib/malloc-standard/calloc.c
@@ -0,0 +1,93 @@
+/*
+ This is a version (aka dlmalloc) of malloc/free/realloc written by
+ Doug Lea and released to the public domain. Use, modify, and
+ redistribute this code without permission or acknowledgement in any
+ way you wish. Send questions, comments, complaints, performance
+ data, etc to dl@cs.oswego.edu
+
+ VERSION 2.7.2 Sat Aug 17 09:07:30 2002 Doug Lea (dl at gee)
+
+ Note: There may be an updated version of this malloc obtainable at
+ ftp://gee.cs.oswego.edu/pub/misc/malloc.c
+ Check before installing!
+
+ Hacked up for uClibc by Erik Andersen <andersen@codepoet.org>
+*/
+
+#include "malloc.h"
+
+
+/* ------------------------------ calloc ------------------------------ */
+void* calloc(size_t n_elements, size_t elem_size)
+{
+ mchunkptr p;
+ unsigned long clearsize;
+ unsigned long nclears;
+ size_t size, *d;
+ void* mem;
+
+
+ /* guard vs integer overflow, but allow nmemb
+ * to fall through and call malloc(0) */
+ size=lsize * nmemb;
+ if (n_elements && elem_size != (size / n_elements)) {
+ __set_errno(ENOMEM);
+ return NULL;
+ }
+
+ LOCK;
+ mem = malloc(size);
+ if (mem != 0) {
+ p = mem2chunk(mem);
+
+ if (!chunk_is_mmapped(p))
+ {
+ /*
+ Unroll clear of <= 36 bytes (72 if 8byte sizes)
+ We know that contents have an odd number of
+ size_t-sized words; minimally 3.
+ */
+
+ d = (size_t*)mem;
+ clearsize = chunksize(p) - (sizeof(size_t));
+ nclears = clearsize / sizeof(size_t);
+ assert(nclears >= 3);
+
+ if (nclears > 9)
+ memset(d, 0, clearsize);
+
+ else {
+ *(d+0) = 0;
+ *(d+1) = 0;
+ *(d+2) = 0;
+ if (nclears > 4) {
+ *(d+3) = 0;
+ *(d+4) = 0;
+ if (nclears > 6) {
+ *(d+5) = 0;
+ *(d+6) = 0;
+ if (nclears > 8) {
+ *(d+7) = 0;
+ *(d+8) = 0;
+ }
+ }
+ }
+ }
+ }
+#if 0
+ else
+ {
+ /* Standard unix mmap using /dev/zero clears memory so calloc
+ * doesn't need to actually zero anything....
+ */
+ d = (size_t*)mem;
+ /* Note the additional (sizeof(size_t)) */
+ clearsize = chunksize(p) - 2*(sizeof(size_t));
+ memset(d, 0, clearsize);
+ }
+#endif
+ }
+ UNLOCK;
+ return mem;
+}
+
diff --git a/libc/stdlib/malloc-standard/free.c b/libc/stdlib/malloc-standard/free.c
new file mode 100644
index 000000000..4277767fa
--- /dev/null
+++ b/libc/stdlib/malloc-standard/free.c
@@ -0,0 +1,382 @@
+/*
+ This is a version (aka dlmalloc) of malloc/free/realloc written by
+ Doug Lea and released to the public domain. Use, modify, and
+ redistribute this code without permission or acknowledgement in any
+ way you wish. Send questions, comments, complaints, performance
+ data, etc to dl@cs.oswego.edu
+
+ VERSION 2.7.2 Sat Aug 17 09:07:30 2002 Doug Lea (dl at gee)
+
+ Note: There may be an updated version of this malloc obtainable at
+ ftp://gee.cs.oswego.edu/pub/misc/malloc.c
+ Check before installing!
+
+ Hacked up for uClibc by Erik Andersen <andersen@codepoet.org>
+*/
+
+#include "malloc.h"
+
+
+/* ------------------------- __malloc_trim -------------------------
+ __malloc_trim is an inverse of sorts to __malloc_alloc. It gives memory
+ back to the system (via negative arguments to sbrk) if there is unused
+ memory at the `high' end of the malloc pool. It is called automatically by
+ free() when top space exceeds the trim threshold. It is also called by the
+ public malloc_trim routine. It returns 1 if it actually released any
+ memory, else 0.
+*/
+static int __malloc_trim(size_t pad, mstate av)
+{
+ long top_size; /* Amount of top-most memory */
+ long extra; /* Amount to release */
+ long released; /* Amount actually released */
+ char* current_brk; /* address returned by pre-check sbrk call */
+ char* new_brk; /* address returned by post-check sbrk call */
+ size_t pagesz;
+
+ pagesz = av->pagesize;
+ top_size = chunksize(av->top);
+
+ /* Release in pagesize units, keeping at least one page */
+ extra = ((top_size - pad - MINSIZE + (pagesz-1)) / pagesz - 1) * pagesz;
+
+ if (extra > 0) {
+
+ /*
+ Only proceed if end of memory is where we last set it.
+ This avoids problems if there were foreign sbrk calls.
+ */
+ current_brk = (char*)(MORECORE(0));
+ if (current_brk == (char*)(av->top) + top_size) {
+
+ /*
+ Attempt to release memory. We ignore MORECORE return value,
+ and instead call again to find out where new end of memory is.
+ This avoids problems if first call releases less than we asked,
+ of if failure somehow altered brk value. (We could still
+ encounter problems if it altered brk in some very bad way,
+ but the only thing we can do is adjust anyway, which will cause
+ some downstream failure.)
+ */
+
+ MORECORE(-extra);
+ new_brk = (char*)(MORECORE(0));
+
+ if (new_brk != (char*)MORECORE_FAILURE) {
+ released = (long)(current_brk - new_brk);
+
+ if (released != 0) {
+ /* Success. Adjust top. */
+ av->sbrked_mem -= released;
+ set_head(av->top, (top_size - released) | PREV_INUSE);
+ check_malloc_state();
+ return 1;
+ }
+ }
+ }
+ }
+ return 0;
+}
+
+/*
+ Initialize a malloc_state struct.
+
+ This is called only from within __malloc_consolidate, which needs
+ be called in the same contexts anyway. It is never called directly
+ outside of __malloc_consolidate because some optimizing compilers try
+ to inline it at all call points, which turns out not to be an
+ optimization at all. (Inlining it in __malloc_consolidate is fine though.)
+*/
+static void malloc_init_state(mstate av)
+{
+ int i;
+ mbinptr bin;
+
+ /* Establish circular links for normal bins */
+ for (i = 1; i < NBINS; ++i) {
+ bin = bin_at(av,i);
+ bin->fd = bin->bk = bin;
+ }
+
+ av->top_pad = DEFAULT_TOP_PAD;
+ av->n_mmaps_max = DEFAULT_MMAP_MAX;
+ av->mmap_threshold = DEFAULT_MMAP_THRESHOLD;
+ av->trim_threshold = DEFAULT_TRIM_THRESHOLD;
+
+#if MORECORE_CONTIGUOUS
+ set_contiguous(av);
+#else
+ set_noncontiguous(av);
+#endif
+
+
+ set_max_fast(av, DEFAULT_MXFAST);
+
+ av->top = initial_top(av);
+ av->pagesize = malloc_getpagesize;
+}
+
+
+/* ----------------------------------------------------------------------
+ *
+ * PUBLIC STUFF
+ *
+ * ----------------------------------------------------------------------*/
+
+
+/* ------------------------- __malloc_consolidate -------------------------
+
+ __malloc_consolidate is a specialized version of free() that tears
+ down chunks held in fastbins. Free itself cannot be used for this
+ purpose since, among other things, it might place chunks back onto
+ fastbins. So, instead, we need to use a minor variant of the same
+ code.
+
+ Also, because this routine needs to be called the first time through
+ malloc anyway, it turns out to be the perfect place to trigger
+ initialization code.
+*/
+void __malloc_consolidate(mstate av)
+{
+ mfastbinptr* fb; /* current fastbin being consolidated */
+ mfastbinptr* maxfb; /* last fastbin (for loop control) */
+ mchunkptr p; /* current chunk being consolidated */
+ mchunkptr nextp; /* next chunk to consolidate */
+ mchunkptr unsorted_bin; /* bin header */
+ mchunkptr first_unsorted; /* chunk to link to */
+
+ /* These have same use as in free() */
+ mchunkptr nextchunk;
+ size_t size;
+ size_t nextsize;
+ size_t prevsize;
+ int nextinuse;
+ mchunkptr bck;
+ mchunkptr fwd;
+
+ /*
+ If max_fast is 0, we know that av hasn't
+ yet been initialized, in which case do so below
+ */
+
+ if (av->max_fast != 0) {
+ clear_fastchunks(av);
+
+ unsorted_bin = unsorted_chunks(av);
+
+ /*
+ Remove each chunk from fast bin and consolidate it, placing it
+ then in unsorted bin. Among other reasons for doing this,
+ placing in unsorted bin avoids needing to calculate actual bins
+ until malloc is sure that chunks aren't immediately going to be
+ reused anyway.
+ */
+
+ maxfb = &(av->fastbins[fastbin_index(av->max_fast)]);
+ fb = &(av->fastbins[0]);
+ do {
+ if ( (p = *fb) != 0) {
+ *fb = 0;
+
+ do {
+ check_inuse_chunk(p);
+ nextp = p->fd;
+
+ /* Slightly streamlined version of consolidation code in free() */
+ size = p->size & ~PREV_INUSE;
+ nextchunk = chunk_at_offset(p, size);
+ nextsize = chunksize(nextchunk);
+
+ if (!prev_inuse(p)) {
+ prevsize = p->prev_size;
+ size += prevsize;
+ p = chunk_at_offset(p, -((long) prevsize));
+ unlink(p, bck, fwd);
+ }
+
+ if (nextchunk != av->top) {
+ nextinuse = inuse_bit_at_offset(nextchunk, nextsize);
+ set_head(nextchunk, nextsize);
+
+ if (!nextinuse) {
+ size += nextsize;
+ unlink(nextchunk, bck, fwd);
+ }
+
+ first_unsorted = unsorted_bin->fd;
+ unsorted_bin->fd = p;
+ first_unsorted->bk = p;
+
+ set_head(p, size | PREV_INUSE);
+ p->bk = unsorted_bin;
+ p->fd = first_unsorted;
+ set_foot(p, size);
+ }
+
+ else {
+ size += nextsize;
+ set_head(p, size | PREV_INUSE);
+ av->top = p;
+ }
+
+ } while ( (p = nextp) != 0);
+
+ }
+ } while (fb++ != maxfb);
+ }
+ else {
+ malloc_init_state(av);
+ check_malloc_state();
+ }
+}
+
+
+/* ------------------------------ free ------------------------------ */
+void free(void* mem)
+{
+ mstate av;
+
+ mchunkptr p; /* chunk corresponding to mem */
+ size_t size; /* its size */
+ mfastbinptr* fb; /* associated fastbin */
+ mchunkptr nextchunk; /* next contiguous chunk */
+ size_t nextsize; /* its size */
+ int nextinuse; /* true if nextchunk is used */
+ size_t prevsize; /* size of previous contiguous chunk */
+ mchunkptr bck; /* misc temp for linking */
+ mchunkptr fwd; /* misc temp for linking */
+
+ /* free(0) has no effect */
+ if (mem == NULL)
+ return;
+
+ LOCK;
+ av = get_malloc_state();
+ p = mem2chunk(mem);
+ size = chunksize(p);
+
+ check_inuse_chunk(p);
+
+ /*
+ If eligible, place chunk on a fastbin so it can be found
+ and used quickly in malloc.
+ */
+
+ if ((unsigned long)(size) <= (unsigned long)(av->max_fast)
+
+#if TRIM_FASTBINS
+ /* If TRIM_FASTBINS set, don't place chunks
+ bordering top into fastbins */
+ && (chunk_at_offset(p, size) != av->top)
+#endif
+ ) {
+
+ set_fastchunks(av);
+ fb = &(av->fastbins[fastbin_index(size)]);
+ p->fd = *fb;
+ *fb = p;
+ }
+
+ /*
+ Consolidate other non-mmapped chunks as they arrive.
+ */
+
+ else if (!chunk_is_mmapped(p)) {
+ set_anychunks(av);
+
+ nextchunk = chunk_at_offset(p, size);
+ nextsize = chunksize(nextchunk);
+
+ /* consolidate backward */
+ if (!prev_inuse(p)) {
+ prevsize = p->prev_size;
+ size += prevsize;
+ p = chunk_at_offset(p, -((long) prevsize));
+ unlink(p, bck, fwd);
+ }
+
+ if (nextchunk != av->top) {
+ /* get and clear inuse bit */
+ nextinuse = inuse_bit_at_offset(nextchunk, nextsize);
+ set_head(nextchunk, nextsize);
+
+ /* consolidate forward */
+ if (!nextinuse) {
+ unlink(nextchunk, bck, fwd);
+ size += nextsize;
+ }
+
+ /*
+ Place the chunk in unsorted chunk list. Chunks are
+ not placed into regular bins until after they have
+ been given one chance to be used in malloc.
+ */
+
+ bck = unsorted_chunks(av);
+ fwd = bck->fd;
+ p->bk = bck;
+ p->fd = fwd;
+ bck->fd = p;
+ fwd->bk = p;
+
+ set_head(p, size | PREV_INUSE);
+ set_foot(p, size);
+
+ check_free_chunk(p);
+ }
+
+ /*
+ If the chunk borders the current high end of memory,
+ consolidate into top
+ */
+
+ else {
+ size += nextsize;
+ set_head(p, size | PREV_INUSE);
+ av->top = p;
+ check_chunk(p);
+ }
+
+ /*
+ If freeing a large space, consolidate possibly-surrounding
+ chunks. Then, if the total unused topmost memory exceeds trim
+ threshold, ask malloc_trim to reduce top.
+
+ Unless max_fast is 0, we don't know if there are fastbins
+ bordering top, so we cannot tell for sure whether threshold
+ has been reached unless fastbins are consolidated. But we
+ don't want to consolidate on each free. As a compromise,
+ consolidation is performed if FASTBIN_CONSOLIDATION_THRESHOLD
+ is reached.
+ */
+
+ if ((unsigned long)(size) >= FASTBIN_CONSOLIDATION_THRESHOLD) {
+ if (have_fastchunks(av))
+ __malloc_consolidate(av);
+
+ if ((unsigned long)(chunksize(av->top)) >=
+ (unsigned long)(av->trim_threshold))
+ __malloc_trim(av->top_pad, av);
+ }
+
+ }
+ /*
+ If the chunk was allocated via mmap, release via munmap()
+ Note that if HAVE_MMAP is false but chunk_is_mmapped is
+ true, then user must have overwritten memory. There's nothing
+ we can do to catch this error unless DEBUG is set, in which case
+ check_inuse_chunk (above) will have triggered error.
+ */
+
+ else {
+ int ret;
+ size_t offset = p->prev_size;
+ av->n_mmaps--;
+ av->mmapped_mem -= (size + offset);
+ ret = munmap((char*)p - offset, size + offset);
+ /* munmap returns non-zero on failure */
+ assert(ret == 0);
+ }
+ UNLOCK;
+}
+
diff --git a/libc/stdlib/malloc-standard/mallinfo.c b/libc/stdlib/malloc-standard/mallinfo.c
new file mode 100644
index 000000000..89d6b68e1
--- /dev/null
+++ b/libc/stdlib/malloc-standard/mallinfo.c
@@ -0,0 +1,81 @@
+/*
+ This is a version (aka dlmalloc) of malloc/free/realloc written by
+ Doug Lea and released to the public domain. Use, modify, and
+ redistribute this code without permission or acknowledgement in any
+ way you wish. Send questions, comments, complaints, performance
+ data, etc to dl@cs.oswego.edu
+
+ VERSION 2.7.2 Sat Aug 17 09:07:30 2002 Doug Lea (dl at gee)
+
+ Note: There may be an updated version of this malloc obtainable at
+ ftp://gee.cs.oswego.edu/pub/misc/malloc.c
+ Check before installing!
+
+ Hacked up for uClibc by Erik Andersen <andersen@codepoet.org>
+*/
+
+#include "malloc.h"
+
+
+/* ------------------------------ mallinfo ------------------------------ */
+struct mallinfo mallinfo(void)
+{
+ mstate av;
+ struct mallinfo mi;
+ int i;
+ mbinptr b;
+ mchunkptr p;
+ size_t avail;
+ size_t fastavail;
+ int nblocks;
+ int nfastblocks;
+
+ LOCK;
+ av = get_malloc_state();
+ /* Ensure initialization */
+ if (av->top == 0) {
+ __malloc_consolidate(av);
+ }
+
+ check_malloc_state();
+
+ /* Account for top */
+ avail = chunksize(av->top);
+ nblocks = 1; /* top always exists */
+
+ /* traverse fastbins */
+ nfastblocks = 0;
+ fastavail = 0;
+
+ for (i = 0; i < NFASTBINS; ++i) {
+ for (p = av->fastbins[i]; p != 0; p = p->fd) {
+ ++nfastblocks;
+ fastavail += chunksize(p);
+ }
+ }
+
+ avail += fastavail;
+
+ /* traverse regular bins */
+ for (i = 1; i < NBINS; ++i) {
+ b = bin_at(av, i);
+ for (p = last(b); p != b; p = p->bk) {
+ ++nblocks;
+ avail += chunksize(p);
+ }
+ }
+
+ mi.smblks = nfastblocks;
+ mi.ordblks = nblocks;
+ mi.fordblks = avail;
+ mi.uordblks = av->sbrked_mem - avail;
+ mi.arena = av->sbrked_mem;
+ mi.hblks = av->n_mmaps;
+ mi.hblkhd = av->mmapped_mem;
+ mi.fsmblks = fastavail;
+ mi.keepcost = chunksize(av->top);
+ mi.usmblks = av->max_total_mem;
+ UNLOCK;
+ return mi;
+}
+
diff --git a/libc/stdlib/malloc-standard/malloc.c b/libc/stdlib/malloc-standard/malloc.c
new file mode 100644
index 000000000..8d132a43e
--- /dev/null
+++ b/libc/stdlib/malloc-standard/malloc.c
@@ -0,0 +1,1160 @@
+/*
+ This is a version (aka dlmalloc) of malloc/free/realloc written by
+ Doug Lea and released to the public domain. Use, modify, and
+ redistribute this code without permission or acknowledgement in any
+ way you wish. Send questions, comments, complaints, performance
+ data, etc to dl@cs.oswego.edu
+
+ VERSION 2.7.2 Sat Aug 17 09:07:30 2002 Doug Lea (dl at gee)
+
+ Note: There may be an updated version of this malloc obtainable at
+ ftp://gee.cs.oswego.edu/pub/misc/malloc.c
+ Check before installing!
+
+ Hacked up for uClibc by Erik Andersen <andersen@codepoet.org>
+*/
+
+#define _GNU_SOURCE
+#include "malloc.h"
+
+
+#ifdef __UCLIBC_HAS_THREADS__
+pthread_mutex_t __malloc_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
+#endif
+
+/*
+ There is exactly one instance of this struct in this malloc.
+ If you are adapting this malloc in a way that does NOT use a static
+ malloc_state, you MUST explicitly zero-fill it before using. This
+ malloc relies on the property that malloc_state is initialized to
+ all zeroes (as is true of C statics).
+*/
+struct malloc_state __malloc_state; /* never directly referenced */
+
+/* forward declaration */
+static int __malloc_largebin_index(unsigned int sz);
+
+#ifdef __MALLOC_DEBUGGING
+
+/*
+ Debugging support
+
+ Because freed chunks may be overwritten with bookkeeping fields, this
+ malloc will often die when freed memory is overwritten by user
+ programs. This can be very effective (albeit in an annoying way)
+ in helping track down dangling pointers.
+
+ If you compile with -D__MALLOC_DEBUGGING, a number of assertion checks are
+ enabled that will catch more memory errors. You probably won't be
+ able to make much sense of the actual assertion errors, but they
+ should help you locate incorrectly overwritten memory. The
+ checking is fairly extensive, and will slow down execution
+ noticeably. Calling malloc_stats or mallinfo with __MALLOC_DEBUGGING set will
+ attempt to check every non-mmapped allocated and free chunk in the
+ course of computing the summmaries. (By nature, mmapped regions
+ cannot be checked very much automatically.)
+
+ Setting __MALLOC_DEBUGGING may also be helpful if you are trying to modify
+ this code. The assertions in the check routines spell out in more
+ detail the assumptions and invariants underlying the algorithms.
+
+ Setting __MALLOC_DEBUGGING does NOT provide an automated mechanism for checking
+ that all accesses to malloced memory stay within their
+ bounds. However, there are several add-ons and adaptations of this
+ or other mallocs available that do this.
+*/
+
+/* Properties of all chunks */
+void __do_check_chunk(mchunkptr p)
+{
+ mstate av = get_malloc_state();
+#ifdef __DOASSERTS__
+ /* min and max possible addresses assuming contiguous allocation */
+ char* max_address = (char*)(av->top) + chunksize(av->top);
+ char* min_address = max_address - av->sbrked_mem;
+ unsigned long sz = chunksize(p);
+#endif
+
+ if (!chunk_is_mmapped(p)) {
+
+ /* Has legal address ... */
+ if (p != av->top) {
+ if (contiguous(av)) {
+ assert(((char*)p) >= min_address);
+ assert(((char*)p + sz) <= ((char*)(av->top)));
+ }
+ }
+ else {
+ /* top size is always at least MINSIZE */
+ assert((unsigned long)(sz) >= MINSIZE);
+ /* top predecessor always marked inuse */
+ assert(prev_inuse(p));
+ }
+
+ }
+ else {
+ /* address is outside main heap */
+ if (contiguous(av) && av->top != initial_top(av)) {
+ assert(((char*)p) < min_address || ((char*)p) > max_address);
+ }
+ /* chunk is page-aligned */
+ assert(((p->prev_size + sz) & (av->pagesize-1)) == 0);
+ /* mem is aligned */
+ assert(aligned_OK(chunk2mem(p)));
+ }
+}
+
+/* Properties of free chunks */
+void __do_check_free_chunk(mchunkptr p)
+{
+ size_t sz = p->size & ~PREV_INUSE;
+#ifdef __DOASSERTS__
+ mstate av = get_malloc_state();
+ mchunkptr next = chunk_at_offset(p, sz);
+#endif
+
+ __do_check_chunk(p);
+
+ /* Chunk must claim to be free ... */
+ assert(!inuse(p));
+ assert (!chunk_is_mmapped(p));
+
+ /* Unless a special marker, must have OK fields */
+ if ((unsigned long)(sz) >= MINSIZE)
+ {
+ assert((sz & MALLOC_ALIGN_MASK) == 0);
+ assert(aligned_OK(chunk2mem(p)));
+ /* ... matching footer field */
+ assert(next->prev_size == sz);
+ /* ... and is fully consolidated */
+ assert(prev_inuse(p));
+ assert (next == av->top || inuse(next));
+
+ /* ... and has minimally sane links */
+ assert(p->fd->bk == p);
+ assert(p->bk->fd == p);
+ }
+ else /* markers are always of size (sizeof(size_t)) */
+ assert(sz == (sizeof(size_t)));
+}
+
+/* Properties of inuse chunks */
+void __do_check_inuse_chunk(mchunkptr p)
+{
+ mstate av = get_malloc_state();
+ mchunkptr next;
+ __do_check_chunk(p);
+
+ if (chunk_is_mmapped(p))
+ return; /* mmapped chunks have no next/prev */
+
+ /* Check whether it claims to be in use ... */
+ assert(inuse(p));
+
+ next = next_chunk(p);
+
+ /* ... and is surrounded by OK chunks.
+ Since more things can be checked with free chunks than inuse ones,
+ if an inuse chunk borders them and debug is on, it's worth doing them.
+ */
+ if (!prev_inuse(p)) {
+ /* Note that we cannot even look at prev unless it is not inuse */
+ mchunkptr prv = prev_chunk(p);
+ assert(next_chunk(prv) == p);
+ __do_check_free_chunk(prv);
+ }
+
+ if (next == av->top) {
+ assert(prev_inuse(next));
+ assert(chunksize(next) >= MINSIZE);
+ }
+ else if (!inuse(next))
+ __do_check_free_chunk(next);
+}
+
+/* Properties of chunks recycled from fastbins */
+void __do_check_remalloced_chunk(mchunkptr p, size_t s)
+{
+#ifdef __DOASSERTS__
+ size_t sz = p->size & ~PREV_INUSE;
+#endif
+
+ __do_check_inuse_chunk(p);
+
+ /* Legal size ... */
+ assert((sz & MALLOC_ALIGN_MASK) == 0);
+ assert((unsigned long)(sz) >= MINSIZE);
+ /* ... and alignment */
+ assert(aligned_OK(chunk2mem(p)));
+ /* chunk is less than MINSIZE more than request */
+ assert((long)(sz) - (long)(s) >= 0);
+ assert((long)(sz) - (long)(s + MINSIZE) < 0);
+}
+
+/* Properties of nonrecycled chunks at the point they are malloced */
+void __do_check_malloced_chunk(mchunkptr p, size_t s)
+{
+ /* same as recycled case ... */
+ __do_check_remalloced_chunk(p, s);
+
+ /*
+ ... plus, must obey implementation invariant that prev_inuse is
+ always true of any allocated chunk; i.e., that each allocated
+ chunk borders either a previously allocated and still in-use
+ chunk, or the base of its memory arena. This is ensured
+ by making all allocations from the the `lowest' part of any found
+ chunk. This does not necessarily hold however for chunks
+ recycled via fastbins.
+ */
+
+ assert(prev_inuse(p));
+}
+
+
+/*
+ Properties of malloc_state.
+
+ This may be useful for debugging malloc, as well as detecting user
+ programmer errors that somehow write into malloc_state.
+
+ If you are extending or experimenting with this malloc, you can
+ probably figure out how to hack this routine to print out or
+ display chunk addresses, sizes, bins, and other instrumentation.
+*/
+void __do_check_malloc_state(void)
+{
+ mstate av = get_malloc_state();
+ int i;
+ mchunkptr p;
+ mchunkptr q;
+ mbinptr b;
+ unsigned int binbit;
+ int empty;
+ unsigned int idx;
+ size_t size;
+ unsigned long total = 0;
+ int max_fast_bin;
+
+ /* internal size_t must be no wider than pointer type */
+ assert(sizeof(size_t) <= sizeof(char*));
+
+ /* alignment is a power of 2 */
+ assert((MALLOC_ALIGNMENT & (MALLOC_ALIGNMENT-1)) == 0);
+
+ /* cannot run remaining checks until fully initialized */
+ if (av->top == 0 || av->top == initial_top(av))
+ return;
+
+ /* pagesize is a power of 2 */
+ assert((av->pagesize & (av->pagesize-1)) == 0);
+
+ /* properties of fastbins */
+
+ /* max_fast is in allowed range */
+ assert(get_max_fast(av) <= request2size(MAX_FAST_SIZE));
+
+ max_fast_bin = fastbin_index(av->max_fast);
+
+ for (i = 0; i < NFASTBINS; ++i) {
+ p = av->fastbins[i];
+
+ /* all bins past max_fast are empty */
+ if (i > max_fast_bin)
+ assert(p == 0);
+
+ while (p != 0) {
+ /* each chunk claims to be inuse */
+ __do_check_inuse_chunk(p);
+ total += chunksize(p);
+ /* chunk belongs in this bin */
+ assert(fastbin_index(chunksize(p)) == i);
+ p = p->fd;
+ }
+ }
+
+ if (total != 0)
+ assert(have_fastchunks(av));
+ else if (!have_fastchunks(av))
+ assert(total == 0);
+
+ /* check normal bins */
+ for (i = 1; i < NBINS; ++i) {
+ b = bin_at(av,i);
+
+ /* binmap is accurate (except for bin 1 == unsorted_chunks) */
+ if (i >= 2) {
+ binbit = get_binmap(av,i);
+ empty = last(b) == b;
+ if (!binbit)
+ assert(empty);
+ else if (!empty)
+ assert(binbit);
+ }
+
+ for (p = last(b); p != b; p = p->bk) {
+ /* each chunk claims to be free */
+ __do_check_free_chunk(p);
+ size = chunksize(p);
+ total += size;
+ if (i >= 2) {
+ /* chunk belongs in bin */
+ idx = bin_index(size);
+ assert(idx == i);
+ /* lists are sorted */
+ if ((unsigned long) size >= (unsigned long)(FIRST_SORTED_BIN_SIZE)) {
+ assert(p->bk == b ||
+ (unsigned long)chunksize(p->bk) >=
+ (unsigned long)chunksize(p));
+ }
+ }
+ /* chunk is followed by a legal chain of inuse chunks */
+ for (q = next_chunk(p);
+ (q != av->top && inuse(q) &&
+ (unsigned long)(chunksize(q)) >= MINSIZE);
+ q = next_chunk(q))
+ __do_check_inuse_chunk(q);
+ }
+ }
+
+ /* top chunk is OK */
+ __do_check_chunk(av->top);
+
+ /* sanity checks for statistics */
+
+ assert(total <= (unsigned long)(av->max_total_mem));
+ assert(av->n_mmaps >= 0);
+ assert(av->n_mmaps <= av->max_n_mmaps);
+
+ assert((unsigned long)(av->sbrked_mem) <=
+ (unsigned long)(av->max_sbrked_mem));
+
+ assert((unsigned long)(av->mmapped_mem) <=
+ (unsigned long)(av->max_mmapped_mem));
+
+ assert((unsigned long)(av->max_total_mem) >=
+ (unsigned long)(av->mmapped_mem) + (unsigned long)(av->sbrked_mem));
+}
+#endif
+
+
+/* ----------- Routines dealing with system allocation -------------- */
+
+/*
+ sysmalloc handles malloc cases requiring more memory from the system.
+ On entry, it is assumed that av->top does not have enough
+ space to service request for nb bytes, thus requiring that av->top
+ be extended or replaced.
+*/
+static void* __malloc_alloc(size_t nb, mstate av)
+{
+ mchunkptr old_top; /* incoming value of av->top */
+ size_t old_size; /* its size */
+ char* old_end; /* its end address */
+
+ long size; /* arg to first MORECORE or mmap call */
+ char* brk; /* return value from MORECORE */
+
+ long correction; /* arg to 2nd MORECORE call */
+ char* snd_brk; /* 2nd return val */
+
+ size_t front_misalign; /* unusable bytes at front of new space */
+ size_t end_misalign; /* partial page left at end of new space */
+ char* aligned_brk; /* aligned offset into brk */
+
+ mchunkptr p; /* the allocated/returned chunk */
+ mchunkptr remainder; /* remainder from allocation */
+ unsigned long remainder_size; /* its size */
+
+ unsigned long sum; /* for updating stats */
+
+ size_t pagemask = av->pagesize - 1;
+
+ /*
+ If there is space available in fastbins, consolidate and retry
+ malloc from scratch rather than getting memory from system. This
+ can occur only if nb is in smallbin range so we didn't consolidate
+ upon entry to malloc. It is much easier to handle this case here
+ than in malloc proper.
+ */
+
+ if (have_fastchunks(av)) {
+ assert(in_smallbin_range(nb));
+ __malloc_consolidate(av);
+ return malloc(nb - MALLOC_ALIGN_MASK);
+ }
+
+
+ /*
+ If have mmap, and the request size meets the mmap threshold, and
+ the system supports mmap, and there are few enough currently
+ allocated mmapped regions, try to directly map this request
+ rather than expanding top.
+ */
+
+ if ((unsigned long)(nb) >= (unsigned long)(av->mmap_threshold) &&
+ (av->n_mmaps < av->n_mmaps_max)) {
+
+ char* mm; /* return value from mmap call*/
+
+ /*
+ Round up size to nearest page. For mmapped chunks, the overhead
+ is one (sizeof(size_t)) unit larger than for normal chunks, because there
+ is no following chunk whose prev_size field could be used.
+ */
+ size = (nb + (sizeof(size_t)) + MALLOC_ALIGN_MASK + pagemask) & ~pagemask;
+
+ /* Don't try if size wraps around 0 */
+ if ((unsigned long)(size) > (unsigned long)(nb)) {
+
+ mm = (char*)(MMAP(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE));
+
+ if (mm != (char*)(MORECORE_FAILURE)) {
+
+ /*
+ The offset to the start of the mmapped region is stored
+ in the prev_size field of the chunk. This allows us to adjust
+ returned start address to meet alignment requirements here
+ and in memalign(), and still be able to compute proper
+ address argument for later munmap in free() and realloc().
+ */
+
+ front_misalign = (size_t)chunk2mem(mm) & MALLOC_ALIGN_MASK;
+ if (front_misalign > 0) {
+ correction = MALLOC_ALIGNMENT - front_misalign;
+ p = (mchunkptr)(mm + correction);
+ p->prev_size = correction;
+ set_head(p, (size - correction) |IS_MMAPPED);
+ }
+ else {
+ p = (mchunkptr)mm;
+ p->prev_size = 0;
+ set_head(p, size|IS_MMAPPED);
+ }
+
+ /* update statistics */
+
+ if (++av->n_mmaps > av->max_n_mmaps)
+ av->max_n_mmaps = av->n_mmaps;
+
+ sum = av->mmapped_mem += size;
+ if (sum > (unsigned long)(av->max_mmapped_mem))
+ av->max_mmapped_mem = sum;
+ sum += av->sbrked_mem;
+ if (sum > (unsigned long)(av->max_total_mem))
+ av->max_total_mem = sum;
+
+ check_chunk(p);
+
+ return chunk2mem(p);
+ }
+ }
+ }
+
+ /* Record incoming configuration of top */
+
+ old_top = av->top;
+ old_size = chunksize(old_top);
+ old_end = (char*)(chunk_at_offset(old_top, old_size));
+
+ brk = snd_brk = (char*)(MORECORE_FAILURE);
+
+ /* If not the first time through, we require old_size to
+ * be at least MINSIZE and to have prev_inuse set. */
+
+ assert((old_top == initial_top(av) && old_size == 0) ||
+ ((unsigned long) (old_size) >= MINSIZE &&
+ prev_inuse(old_top)));
+
+ /* Precondition: not enough current space to satisfy nb request */
+ assert((unsigned long)(old_size) < (unsigned long)(nb + MINSIZE));
+
+ /* Precondition: all fastbins are consolidated */
+ assert(!have_fastchunks(av));
+
+
+ /* Request enough space for nb + pad + overhead */
+
+ size = nb + av->top_pad + MINSIZE;
+
+ /*
+ If contiguous, we can subtract out existing space that we hope to
+ combine with new space. We add it back later only if
+ we don't actually get contiguous space.
+ */
+
+ if (contiguous(av))
+ size -= old_size;
+
+ /*
+ Round to a multiple of page size.
+ If MORECORE is not contiguous, this ensures that we only call it
+ with whole-page arguments. And if MORECORE is contiguous and
+ this is not first time through, this preserves page-alignment of
+ previous calls. Otherwise, we correct to page-align below.
+ */
+
+ size = (size + pagemask) & ~pagemask;
+
+ /*
+ Don't try to call MORECORE if argument is so big as to appear
+ negative. Note that since mmap takes size_t arg, it may succeed
+ below even if we cannot call MORECORE.
+ */
+
+ if (size > 0)
+ brk = (char*)(MORECORE(size));
+
+ /*
+ If have mmap, try using it as a backup when MORECORE fails or
+ cannot be used. This is worth doing on systems that have "holes" in
+ address space, so sbrk cannot extend to give contiguous space, but
+ space is available elsewhere. Note that we ignore mmap max count
+ and threshold limits, since the space will not be used as a
+ segregated mmap region.
+ */
+
+ if (brk == (char*)(MORECORE_FAILURE)) {
+
+ /* Cannot merge with old top, so add its size back in */
+ if (contiguous(av))
+ size = (size + old_size + pagemask) & ~pagemask;
+
+ /* If we are relying on mmap as backup, then use larger units */
+ if ((unsigned long)(size) < (unsigned long)(MMAP_AS_MORECORE_SIZE))
+ size = MMAP_AS_MORECORE_SIZE;
+
+ /* Don't try if size wraps around 0 */
+ if ((unsigned long)(size) > (unsigned long)(nb)) {
+
+ brk = (char*)(MMAP(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE));
+
+ if (brk != (char*)(MORECORE_FAILURE)) {
+
+ /* We do not need, and cannot use, another sbrk call to find end */
+ snd_brk = brk + size;
+
+ /* Record that we no longer have a contiguous sbrk region.
+ After the first time mmap is used as backup, we do not
+ ever rely on contiguous space since this could incorrectly
+ bridge regions.
+ */
+ set_noncontiguous(av);
+ }
+ }
+ }
+
+ if (brk != (char*)(MORECORE_FAILURE)) {
+ av->sbrked_mem += size;
+
+ /*
+ If MORECORE extends previous space, we can likewise extend top size.
+ */
+
+ if (brk == old_end && snd_brk == (char*)(MORECORE_FAILURE)) {
+ set_head(old_top, (size + old_size) | PREV_INUSE);
+ }
+
+ /*
+ Otherwise, make adjustments:
+
+ * If the first time through or noncontiguous, we need to call sbrk
+ just to find out where the end of memory lies.
+
+ * We need to ensure that all returned chunks from malloc will meet
+ MALLOC_ALIGNMENT
+
+ * If there was an intervening foreign sbrk, we need to adjust sbrk
+ request size to account for fact that we will not be able to
+ combine new space with existing space in old_top.
+
+ * Almost all systems internally allocate whole pages at a time, in
+ which case we might as well use the whole last page of request.
+ So we allocate enough more memory to hit a page boundary now,
+ which in turn causes future contiguous calls to page-align.
+ */
+
+ else {
+ front_misalign = 0;
+ end_misalign = 0;
+ correction = 0;
+ aligned_brk = brk;
+
+ /*
+ If MORECORE returns an address lower than we have seen before,
+ we know it isn't really contiguous. This and some subsequent
+ checks help cope with non-conforming MORECORE functions and
+ the presence of "foreign" calls to MORECORE from outside of
+ malloc or by other threads. We cannot guarantee to detect
+ these in all cases, but cope with the ones we do detect.
+ */
+ if (contiguous(av) && old_size != 0 && brk < old_end) {
+ set_noncontiguous(av);
+ }
+
+ /* handle contiguous cases */
+ if (contiguous(av)) {
+
+ /* We can tolerate forward non-contiguities here (usually due
+ to foreign calls) but treat them as part of our space for
+ stats reporting. */
+ if (old_size != 0)
+ av->sbrked_mem += brk - old_end;
+
+ /* Guarantee alignment of first new chunk made from this space */
+
+ front_misalign = (size_t)chunk2mem(brk) & MALLOC_ALIGN_MASK;
+ if (front_misalign > 0) {
+
+ /*
+ Skip over some bytes to arrive at an aligned position.
+ We don't need to specially mark these wasted front bytes.
+ They will never be accessed anyway because
+ prev_inuse of av->top (and any chunk created from its start)
+ is always true after initialization.
+ */
+
+ correction = MALLOC_ALIGNMENT - front_misalign;
+ aligned_brk += correction;
+ }
+
+ /*
+ If this isn't adjacent to existing space, then we will not
+ be able to merge with old_top space, so must add to 2nd request.
+ */
+
+ correction += old_size;
+
+ /* Extend the end address to hit a page boundary */
+ end_misalign = (size_t)(brk + size + correction);
+ correction += ((end_misalign + pagemask) & ~pagemask) - end_misalign;
+
+ assert(correction >= 0);
+ snd_brk = (char*)(MORECORE(correction));
+
+ if (snd_brk == (char*)(MORECORE_FAILURE)) {
+ /*
+ If can't allocate correction, try to at least find out current
+ brk. It might be enough to proceed without failing.
+ */
+ correction = 0;
+ snd_brk = (char*)(MORECORE(0));
+ }
+ else if (snd_brk < brk) {
+ /*
+ If the second call gives noncontiguous space even though
+ it says it won't, the only course of action is to ignore
+ results of second call, and conservatively estimate where
+ the first call left us. Also set noncontiguous, so this
+ won't happen again, leaving at most one hole.
+
+ Note that this check is intrinsically incomplete. Because
+ MORECORE is allowed to give more space than we ask for,
+ there is no reliable way to detect a noncontiguity
+ producing a forward gap for the second call.
+ */
+ snd_brk = brk + size;
+ correction = 0;
+ set_noncontiguous(av);
+ }
+
+ }
+
+ /* handle non-contiguous cases */
+ else {
+ /* MORECORE/mmap must correctly align */
+ assert(aligned_OK(chunk2mem(brk)));
+
+ /* Find out current end of memory */
+ if (snd_brk == (char*)(MORECORE_FAILURE)) {
+ snd_brk = (char*)(MORECORE(0));
+ av->sbrked_mem += snd_brk - brk - size;
+ }
+ }
+
+ /* Adjust top based on results of second sbrk */
+ if (snd_brk != (char*)(MORECORE_FAILURE)) {
+ av->top = (mchunkptr)aligned_brk;
+ set_head(av->top, (snd_brk - aligned_brk + correction) | PREV_INUSE);
+ av->sbrked_mem += correction;
+
+ /*
+ If not the first time through, we either have a
+ gap due to foreign sbrk or a non-contiguous region. Insert a
+ double fencepost at old_top to prevent consolidation with space
+ we don't own. These fenceposts are artificial chunks that are
+ marked as inuse and are in any case too small to use. We need
+ two to make sizes and alignments work out.
+ */
+
+ if (old_size != 0) {
+ /* Shrink old_top to insert fenceposts, keeping size a
+ multiple of MALLOC_ALIGNMENT. We know there is at least
+ enough space in old_top to do this.
+ */
+ old_size = (old_size - 3*(sizeof(size_t))) & ~MALLOC_ALIGN_MASK;
+ set_head(old_top, old_size | PREV_INUSE);
+
+ /*
+ Note that the following assignments completely overwrite
+ old_top when old_size was previously MINSIZE. This is
+ intentional. We need the fencepost, even if old_top otherwise gets
+ lost.
+ */
+ chunk_at_offset(old_top, old_size )->size =
+ (sizeof(size_t))|PREV_INUSE;
+
+ chunk_at_offset(old_top, old_size + (sizeof(size_t)))->size =
+ (sizeof(size_t))|PREV_INUSE;
+
+ /* If possible, release the rest, suppressing trimming. */
+ if (old_size >= MINSIZE) {
+ size_t tt = av->trim_threshold;
+ av->trim_threshold = (size_t)(-1);
+ free(chunk2mem(old_top));
+ av->trim_threshold = tt;
+ }
+ }
+ }
+ }
+
+ /* Update statistics */
+ sum = av->sbrked_mem;
+ if (sum > (unsigned long)(av->max_sbrked_mem))
+ av->max_sbrked_mem = sum;
+
+ sum += av->mmapped_mem;
+ if (sum > (unsigned long)(av->max_total_mem))
+ av->max_total_mem = sum;
+
+ check_malloc_state();
+
+ /* finally, do the allocation */
+
+ p = av->top;
+ size = chunksize(p);
+
+ /* check that one of the above allocation paths succeeded */
+ if ((unsigned long)(size) >= (unsigned long)(nb + MINSIZE)) {
+ remainder_size = size - nb;
+ remainder = chunk_at_offset(p, nb);
+ av->top = remainder;
+ set_head(p, nb | PREV_INUSE);
+ set_head(remainder, remainder_size | PREV_INUSE);
+ check_malloced_chunk(p, nb);
+ return chunk2mem(p);
+ }
+
+ }
+
+ /* catch all failure paths */
+ errno = ENOMEM;
+ return 0;
+}
+
+
+/*
+ Compute index for size. We expect this to be inlined when
+ compiled with optimization, else not, which works out well.
+*/
+static int __malloc_largebin_index(unsigned int sz)
+{
+ unsigned int x = sz >> SMALLBIN_WIDTH;
+ unsigned int m; /* bit position of highest set bit of m */
+
+ if (x >= 0x10000) return NBINS-1;
+
+ /* On intel, use BSRL instruction to find highest bit */
+#if defined(__GNUC__) && defined(i386)
+
+ __asm__("bsrl %1,%0\n\t"
+ : "=r" (m)
+ : "g" (x));
+
+#else
+ {
+ /*
+ Based on branch-free nlz algorithm in chapter 5 of Henry
+ S. Warren Jr's book "Hacker's Delight".
+ */
+
+ unsigned int n = ((x - 0x100) >> 16) & 8;
+ x <<= n;
+ m = ((x - 0x1000) >> 16) & 4;
+ n += m;
+ x <<= m;
+ m = ((x - 0x4000) >> 16) & 2;
+ n += m;
+ x = (x << m) >> 14;
+ m = 13 - n + (x & ~(x>>1));
+ }
+#endif
+
+ /* Use next 2 bits to create finer-granularity bins */
+ return NSMALLBINS + (m << 2) + ((sz >> (m + 6)) & 3);
+}
+
+
+
+/* ----------------------------------------------------------------------
+ *
+ * PUBLIC STUFF
+ *
+ * ----------------------------------------------------------------------*/
+
+
+/* ------------------------------ malloc ------------------------------ */
+void* malloc(size_t bytes)
+{
+ mstate av;
+
+ size_t nb; /* normalized request size */
+ unsigned int idx; /* associated bin index */
+ mbinptr bin; /* associated bin */
+ mfastbinptr* fb; /* associated fastbin */
+
+ mchunkptr victim; /* inspected/selected chunk */
+ size_t size; /* its size */
+ int victim_index; /* its bin index */
+
+ mchunkptr remainder; /* remainder from a split */
+ unsigned long remainder_size; /* its size */
+
+ unsigned int block; /* bit map traverser */
+ unsigned int bit; /* bit map traverser */
+ unsigned int map; /* current word of binmap */
+
+ mchunkptr fwd; /* misc temp for linking */
+ mchunkptr bck; /* misc temp for linking */
+ void * sysmem;
+
+ LOCK;
+ av = get_malloc_state();
+ /*
+ Convert request size to internal form by adding (sizeof(size_t)) bytes
+ overhead plus possibly more to obtain necessary alignment and/or
+ to obtain a size of at least MINSIZE, the smallest allocatable
+ size. Also, checked_request2size traps (returning 0) request sizes
+ that are so large that they wrap around zero when padded and
+ aligned.
+ */
+
+ checked_request2size(bytes, nb);
+
+ /*
+ Bypass search if no frees yet
+ */
+ if (!have_anychunks(av)) {
+ if (av->max_fast == 0) /* initialization check */
+ __malloc_consolidate(av);
+ goto use_top;
+ }
+
+ /*
+ If the size qualifies as a fastbin, first check corresponding bin.
+ */
+
+ if ((unsigned long)(nb) <= (unsigned long)(av->max_fast)) {
+ fb = &(av->fastbins[(fastbin_index(nb))]);
+ if ( (victim = *fb) != 0) {
+ *fb = victim->fd;
+ check_remalloced_chunk(victim, nb);
+ UNLOCK;
+ return chunk2mem(victim);
+ }
+ }
+
+ /*
+ If a small request, check regular bin. Since these "smallbins"
+ hold one size each, no searching within bins is necessary.
+ (For a large request, we need to wait until unsorted chunks are
+ processed to find best fit. But for small ones, fits are exact
+ anyway, so we can check now, which is faster.)
+ */
+
+ if (in_smallbin_range(nb)) {
+ idx = smallbin_index(nb);
+ bin = bin_at(av,idx);
+
+ if ( (victim = last(bin)) != bin) {
+ bck = victim->bk;
+ set_inuse_bit_at_offset(victim, nb);
+ bin->bk = bck;
+ bck->fd = bin;
+
+ check_malloced_chunk(victim, nb);
+ UNLOCK;
+ return chunk2mem(victim);
+ }
+ }
+
+ /* If this is a large request, consolidate fastbins before continuing.
+ While it might look excessive to kill all fastbins before
+ even seeing if there is space available, this avoids
+ fragmentation problems normally associated with fastbins.
+ Also, in practice, programs tend to have runs of either small or
+ large requests, but less often mixtures, so consolidation is not
+ invoked all that often in most programs. And the programs that
+ it is called frequently in otherwise tend to fragment.
+ */
+
+ else {
+ idx = __malloc_largebin_index(nb);
+ if (have_fastchunks(av))
+ __malloc_consolidate(av);
+ }
+
+ /*
+ Process recently freed or remaindered chunks, taking one only if
+ it is exact fit, or, if this a small request, the chunk is remainder from
+ the most recent non-exact fit. Place other traversed chunks in
+ bins. Note that this step is the only place in any routine where
+ chunks are placed in bins.
+ */
+
+ while ( (victim = unsorted_chunks(av)->bk) != unsorted_chunks(av)) {
+ bck = victim->bk;
+ size = chunksize(victim);
+
+ /* If a small request, try to use last remainder if it is the
+ only chunk in unsorted bin. This helps promote locality for
+ runs of consecutive small requests. This is the only
+ exception to best-fit, and applies only when there is
+ no exact fit for a small chunk.
+ */
+
+ if (in_smallbin_range(nb) &&
+ bck == unsorted_chunks(av) &&
+ victim == av->last_remainder &&
+ (unsigned long)(size) > (unsigned long)(nb + MINSIZE)) {
+
+ /* split and reattach remainder */
+ remainder_size = size - nb;
+ remainder = chunk_at_offset(victim, nb);
+ unsorted_chunks(av)->bk = unsorted_chunks(av)->fd = remainder;
+ av->last_remainder = remainder;
+ remainder->bk = remainder->fd = unsorted_chunks(av);
+
+ set_head(victim, nb | PREV_INUSE);
+ set_head(remainder, remainder_size | PREV_INUSE);
+ set_foot(remainder, remainder_size);
+
+ check_malloced_chunk(victim, nb);
+ UNLOCK;
+ return chunk2mem(victim);
+ }
+
+ /* remove from unsorted list */
+ unsorted_chunks(av)->bk = bck;
+ bck->fd = unsorted_chunks(av);
+
+ /* Take now instead of binning if exact fit */
+
+ if (size == nb) {
+ set_inuse_bit_at_offset(victim, size);
+ check_malloced_chunk(victim, nb);
+ UNLOCK;
+ return chunk2mem(victim);
+ }
+
+ /* place chunk in bin */
+
+ if (in_smallbin_range(size)) {
+ victim_index = smallbin_index(size);
+ bck = bin_at(av, victim_index);
+ fwd = bck->fd;
+ }
+ else {
+ victim_index = __malloc_largebin_index(size);
+ bck = bin_at(av, victim_index);
+ fwd = bck->fd;
+
+ if (fwd != bck) {
+ /* if smaller than smallest, place first */
+ if ((unsigned long)(size) < (unsigned long)(bck->bk->size)) {
+ fwd = bck;
+ bck = bck->bk;
+ }
+ else if ((unsigned long)(size) >=
+ (unsigned long)(FIRST_SORTED_BIN_SIZE)) {
+
+ /* maintain large bins in sorted order */
+ size |= PREV_INUSE; /* Or with inuse bit to speed comparisons */
+ while ((unsigned long)(size) < (unsigned long)(fwd->size))
+ fwd = fwd->fd;
+ bck = fwd->bk;
+ }
+ }
+ }
+
+ mark_bin(av, victim_index);
+ victim->bk = bck;
+ victim->fd = fwd;
+ fwd->bk = victim;
+ bck->fd = victim;
+ }
+
+ /*
+ If a large request, scan through the chunks of current bin to
+ find one that fits. (This will be the smallest that fits unless
+ FIRST_SORTED_BIN_SIZE has been changed from default.) This is
+ the only step where an unbounded number of chunks might be
+ scanned without doing anything useful with them. However the
+ lists tend to be short.
+ */
+
+ if (!in_smallbin_range(nb)) {
+ bin = bin_at(av, idx);
+
+ for (victim = last(bin); victim != bin; victim = victim->bk) {
+ size = chunksize(victim);
+
+ if ((unsigned long)(size) >= (unsigned long)(nb)) {
+ remainder_size = size - nb;
+ unlink(victim, bck, fwd);
+
+ /* Exhaust */
+ if (remainder_size < MINSIZE) {
+ set_inuse_bit_at_offset(victim, size);
+ check_malloced_chunk(victim, nb);
+ UNLOCK;
+ return chunk2mem(victim);
+ }
+ /* Split */
+ else {
+ remainder = chunk_at_offset(victim, nb);
+ unsorted_chunks(av)->bk = unsorted_chunks(av)->fd = remainder;
+ remainder->bk = remainder->fd = unsorted_chunks(av);
+ set_head(victim, nb | PREV_INUSE);
+ set_head(remainder, remainder_size | PREV_INUSE);
+ set_foot(remainder, remainder_size);
+ check_malloced_chunk(victim, nb);
+ UNLOCK;
+ return chunk2mem(victim);
+ }
+ }
+ }
+ }
+
+ /*
+ Search for a chunk by scanning bins, starting with next largest
+ bin. This search is strictly by best-fit; i.e., the smallest
+ (with ties going to approximately the least recently used) chunk
+ that fits is selected.
+
+ The bitmap avoids needing to check that most blocks are nonempty.
+ */
+
+ ++idx;
+ bin = bin_at(av,idx);
+ block = idx2block(idx);
+ map = av->binmap[block];
+ bit = idx2bit(idx);
+
+ for (;;) {
+
+ /* Skip rest of block if there are no more set bits in this block. */
+ if (bit > map || bit == 0) {
+ do {
+ if (++block >= BINMAPSIZE) /* out of bins */
+ goto use_top;
+ } while ( (map = av->binmap[block]) == 0);
+
+ bin = bin_at(av, (block << BINMAPSHIFT));
+ bit = 1;
+ }
+
+ /* Advance to bin with set bit. There must be one. */
+ while ((bit & map) == 0) {
+ bin = next_bin(bin);
+ bit <<= 1;
+ assert(bit != 0);
+ }
+
+ /* Inspect the bin. It is likely to be non-empty */
+ victim = last(bin);
+
+ /* If a false alarm (empty bin), clear the bit. */
+ if (victim == bin) {
+ av->binmap[block] = map &= ~bit; /* Write through */
+ bin = next_bin(bin);
+ bit <<= 1;
+ }
+
+ else {
+ size = chunksize(victim);
+
+ /* We know the first chunk in this bin is big enough to use. */
+ assert((unsigned long)(size) >= (unsigned long)(nb));
+
+ remainder_size = size - nb;
+
+ /* unlink */
+ bck = victim->bk;
+ bin->bk = bck;
+ bck->fd = bin;
+
+ /* Exhaust */
+ if (remainder_size < MINSIZE) {
+ set_inuse_bit_at_offset(victim, size);
+ check_malloced_chunk(victim, nb);
+ UNLOCK;
+ return chunk2mem(victim);
+ }
+
+ /* Split */
+ else {
+ remainder = chunk_at_offset(victim, nb);
+
+ unsorted_chunks(av)->bk = unsorted_chunks(av)->fd = remainder;
+ remainder->bk = remainder->fd = unsorted_chunks(av);
+ /* advertise as last remainder */
+ if (in_smallbin_range(nb))
+ av->last_remainder = remainder;
+
+ set_head(victim, nb | PREV_INUSE);
+ set_head(remainder, remainder_size | PREV_INUSE);
+ set_foot(remainder, remainder_size);
+ check_malloced_chunk(victim, nb);
+ UNLOCK;
+ return chunk2mem(victim);
+ }
+ }
+ }
+
+use_top:
+ /*
+ If large enough, split off the chunk bordering the end of memory
+ (held in av->top). Note that this is in accord with the best-fit
+ search rule. In effect, av->top is treated as larger (and thus
+ less well fitting) than any other available chunk since it can
+ be extended to be as large as necessary (up to system
+ limitations).
+
+ We require that av->top always exists (i.e., has size >=
+ MINSIZE) after initialization, so if it would otherwise be
+ exhuasted by current request, it is replenished. (The main
+ reason for ensuring it exists is that we may need MINSIZE space
+ to put in fenceposts in sysmalloc.)
+ */
+
+ victim = av->top;
+ size = chunksize(victim);
+
+ if ((unsigned long)(size) >= (unsigned long)(nb + MINSIZE)) {
+ remainder_size = size - nb;
+ remainder = chunk_at_offset(victim, nb);
+ av->top = remainder;
+ set_head(victim, nb | PREV_INUSE);
+ set_head(remainder, remainder_size | PREV_INUSE);
+
+ check_malloced_chunk(victim, nb);
+ UNLOCK;
+ return chunk2mem(victim);
+ }
+
+ /* If no space in top, relay to handle system-dependent cases */
+ sysmem = __malloc_alloc(nb, av);
+ UNLOCK;
+ return sysmem;
+}
+
diff --git a/libc/stdlib/malloc-standard/malloc.h b/libc/stdlib/malloc-standard/malloc.h
new file mode 100644
index 000000000..46858332d
--- /dev/null
+++ b/libc/stdlib/malloc-standard/malloc.h
@@ -0,0 +1,953 @@
+/*
+ This is a version (aka dlmalloc) of malloc/free/realloc written by
+ Doug Lea and released to the public domain. Use, modify, and
+ redistribute this code without permission or acknowledgement in any
+ way you wish. Send questions, comments, complaints, performance
+ data, etc to dl@cs.oswego.edu
+
+ VERSION 2.7.2 Sat Aug 17 09:07:30 2002 Doug Lea (dl at gee)
+
+ Note: There may be an updated version of this malloc obtainable at
+ ftp://gee.cs.oswego.edu/pub/misc/malloc.c
+ Check before installing!
+
+ Hacked up for uClibc by Erik Andersen <andersen@codepoet.org>
+*/
+
+#include <features.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <malloc.h>
+
+
+#ifdef __UCLIBC_HAS_THREADS__
+#include <pthread.h>
+extern pthread_mutex_t __malloc_lock;
+# define LOCK __pthread_mutex_lock(&__malloc_lock)
+# define UNLOCK __pthread_mutex_unlock(&__malloc_lock);
+#else
+# define LOCK
+# define UNLOCK
+#endif
+
+
+
+/*
+ MALLOC_ALIGNMENT is the minimum alignment for malloc'ed chunks.
+ It must be a power of two at least 2 * (sizeof(size_t)), even on machines
+ for which smaller alignments would suffice. It may be defined as
+ larger than this though. Note however that code and data structures
+ are optimized for the case of 8-byte alignment.
+*/
+#ifndef MALLOC_ALIGNMENT
+#define MALLOC_ALIGNMENT (2 * (sizeof(size_t)))
+#endif
+
+/* The corresponding bit mask value */
+#define MALLOC_ALIGN_MASK (MALLOC_ALIGNMENT - 1)
+
+/*
+ TRIM_FASTBINS controls whether free() of a very small chunk can
+ immediately lead to trimming. Setting to true (1) can reduce memory
+ footprint, but will almost always slow down programs that use a lot
+ of small chunks.
+
+ Define this only if you are willing to give up some speed to more
+ aggressively reduce system-level memory footprint when releasing
+ memory in programs that use many small chunks. You can get
+ essentially the same effect by setting MXFAST to 0, but this can
+ lead to even greater slowdowns in programs using many small chunks.
+ TRIM_FASTBINS is an in-between compile-time option, that disables
+ only those chunks bordering topmost memory from being placed in
+ fastbins.
+*/
+#ifndef TRIM_FASTBINS
+#define TRIM_FASTBINS 0
+#endif
+
+
+/*
+ MORECORE-related declarations. By default, rely on sbrk
+*/
+
+
+/*
+ MORECORE is the name of the routine to call to obtain more memory
+ from the system. See below for general guidance on writing
+ alternative MORECORE functions, as well as a version for WIN32 and a
+ sample version for pre-OSX macos.
+*/
+#ifndef MORECORE
+#define MORECORE sbrk
+#endif
+
+/*
+ MORECORE_FAILURE is the value returned upon failure of MORECORE
+ as well as mmap. Since it cannot be an otherwise valid memory address,
+ and must reflect values of standard sys calls, you probably ought not
+ try to redefine it.
+*/
+#ifndef MORECORE_FAILURE
+#define MORECORE_FAILURE (-1)
+#endif
+
+/*
+ If MORECORE_CONTIGUOUS is true, take advantage of fact that
+ consecutive calls to MORECORE with positive arguments always return
+ contiguous increasing addresses. This is true of unix sbrk. Even
+ if not defined, when regions happen to be contiguous, malloc will
+ permit allocations spanning regions obtained from different
+ calls. But defining this when applicable enables some stronger
+ consistency checks and space efficiencies.
+*/
+#ifndef MORECORE_CONTIGUOUS
+#define MORECORE_CONTIGUOUS 1
+#endif
+
+/*
+ MMAP_AS_MORECORE_SIZE is the minimum mmap size argument to use if
+ sbrk fails, and mmap is used as a backup (which is done only if
+ HAVE_MMAP). The value must be a multiple of page size. This
+ backup strategy generally applies only when systems have "holes" in
+ address space, so sbrk cannot perform contiguous expansion, but
+ there is still space available on system. On systems for which
+ this is known to be useful (i.e. most linux kernels), this occurs
+ only when programs allocate huge amounts of memory. Between this,
+ and the fact that mmap regions tend to be limited, the size should
+ be large, to avoid too many mmap calls and thus avoid running out
+ of kernel resources.
+*/
+#ifndef MMAP_AS_MORECORE_SIZE
+#define MMAP_AS_MORECORE_SIZE (1024 * 1024)
+#endif
+
+/*
+ The system page size. To the extent possible, this malloc manages
+ memory from the system in page-size units. Note that this value is
+ cached during initialization into a field of malloc_state. So even
+ if malloc_getpagesize is a function, it is only called once.
+
+ The following mechanics for getpagesize were adapted from bsd/gnu
+ getpagesize.h. If none of the system-probes here apply, a value of
+ 4096 is used, which should be OK: If they don't apply, then using
+ the actual value probably doesn't impact performance.
+*/
+#ifndef malloc_getpagesize
+# include <unistd.h>
+# define malloc_getpagesize sysconf(_SC_PAGE_SIZE)
+#else /* just guess */
+# define malloc_getpagesize (4096)
+#endif
+
+
+/* mallopt tuning options */
+
+/*
+ M_MXFAST is the maximum request size used for "fastbins", special bins
+ that hold returned chunks without consolidating their spaces. This
+ enables future requests for chunks of the same size to be handled
+ very quickly, but can increase fragmentation, and thus increase the
+ overall memory footprint of a program.
+
+ This malloc manages fastbins very conservatively yet still
+ efficiently, so fragmentation is rarely a problem for values less
+ than or equal to the default. The maximum supported value of MXFAST
+ is 80. You wouldn't want it any higher than this anyway. Fastbins
+ are designed especially for use with many small structs, objects or
+ strings -- the default handles structs/objects/arrays with sizes up
+ to 16 4byte fields, or small strings representing words, tokens,
+ etc. Using fastbins for larger objects normally worsens
+ fragmentation without improving speed.
+
+ M_MXFAST is set in REQUEST size units. It is internally used in
+ chunksize units, which adds padding and alignment. You can reduce
+ M_MXFAST to 0 to disable all use of fastbins. This causes the malloc
+ algorithm to be a closer approximation of fifo-best-fit in all cases,
+ not just for larger requests, but will generally cause it to be
+ slower.
+*/
+
+
+/* M_MXFAST is a standard SVID/XPG tuning option, usually listed in malloc.h */
+#ifndef M_MXFAST
+#define M_MXFAST 1
+#endif
+
+#ifndef DEFAULT_MXFAST
+#define DEFAULT_MXFAST 64
+#endif
+
+
+/*
+ M_TRIM_THRESHOLD is the maximum amount of unused top-most memory
+ to keep before releasing via malloc_trim in free().
+
+ Automatic trimming is mainly useful in long-lived programs.
+ Because trimming via sbrk can be slow on some systems, and can
+ sometimes be wasteful (in cases where programs immediately
+ afterward allocate more large chunks) the value should be high
+ enough so that your overall system performance would improve by
+ releasing this much memory.
+
+ The trim threshold and the mmap control parameters (see below)
+ can be traded off with one another. Trimming and mmapping are
+ two different ways of releasing unused memory back to the
+ system. Between these two, it is often possible to keep
+ system-level demands of a long-lived program down to a bare
+ minimum. For example, in one test suite of sessions measuring
+ the XF86 X server on Linux, using a trim threshold of 128K and a
+ mmap threshold of 192K led to near-minimal long term resource
+ consumption.
+
+ If you are using this malloc in a long-lived program, it should
+ pay to experiment with these values. As a rough guide, you
+ might set to a value close to the average size of a process
+ (program) running on your system. Releasing this much memory
+ would allow such a process to run in memory. Generally, it's
+ worth it to tune for trimming rather tham memory mapping when a
+ program undergoes phases where several large chunks are
+ allocated and released in ways that can reuse each other's
+ storage, perhaps mixed with phases where there are no such
+ chunks at all. And in well-behaved long-lived programs,
+ controlling release of large blocks via trimming versus mapping
+ is usually faster.
+
+ However, in most programs, these parameters serve mainly as
+ protection against the system-level effects of carrying around
+ massive amounts of unneeded memory. Since frequent calls to
+ sbrk, mmap, and munmap otherwise degrade performance, the default
+ parameters are set to relatively high values that serve only as
+ safeguards.
+
+ The trim value must be greater than page size to have any useful
+ effect. To disable trimming completely, you can set to
+ (unsigned long)(-1)
+
+ Trim settings interact with fastbin (MXFAST) settings: Unless
+ TRIM_FASTBINS is defined, automatic trimming never takes place upon
+ freeing a chunk with size less than or equal to MXFAST. Trimming is
+ instead delayed until subsequent freeing of larger chunks. However,
+ you can still force an attempted trim by calling malloc_trim.
+
+ Also, trimming is not generally possible in cases where
+ the main arena is obtained via mmap.
+
+ Note that the trick some people use of mallocing a huge space and
+ then freeing it at program startup, in an attempt to reserve system
+ memory, doesn't have the intended effect under automatic trimming,
+ since that memory will immediately be returned to the system.
+*/
+#define M_TRIM_THRESHOLD -1
+
+#ifndef DEFAULT_TRIM_THRESHOLD
+#define DEFAULT_TRIM_THRESHOLD (256 * 1024)
+#endif
+
+/*
+ M_TOP_PAD is the amount of extra `padding' space to allocate or
+ retain whenever sbrk is called. It is used in two ways internally:
+
+ * When sbrk is called to extend the top of the arena to satisfy
+ a new malloc request, this much padding is added to the sbrk
+ request.
+
+ * When malloc_trim is called automatically from free(),
+ it is used as the `pad' argument.
+
+ In both cases, the actual amount of padding is rounded
+ so that the end of the arena is always a system page boundary.
+
+ The main reason for using padding is to avoid calling sbrk so
+ often. Having even a small pad greatly reduces the likelihood
+ that nearly every malloc request during program start-up (or
+ after trimming) will invoke sbrk, which needlessly wastes
+ time.
+
+ Automatic rounding-up to page-size units is normally sufficient
+ to avoid measurable overhead, so the default is 0. However, in
+ systems where sbrk is relatively slow, it can pay to increase
+ this value, at the expense of carrying around more memory than
+ the program needs.
+*/
+#define M_TOP_PAD -2
+
+#ifndef DEFAULT_TOP_PAD
+#define DEFAULT_TOP_PAD (0)
+#endif
+
+/*
+ M_MMAP_THRESHOLD is the request size threshold for using mmap()
+ to service a request. Requests of at least this size that cannot
+ be allocated using already-existing space will be serviced via mmap.
+ (If enough normal freed space already exists it is used instead.)
+
+ Using mmap segregates relatively large chunks of memory so that
+ they can be individually obtained and released from the host
+ system. A request serviced through mmap is never reused by any
+ other request (at least not directly; the system may just so
+ happen to remap successive requests to the same locations).
+
+ Segregating space in this way has the benefits that:
+
+ 1. Mmapped space can ALWAYS be individually released back
+ to the system, which helps keep the system level memory
+ demands of a long-lived program low.
+ 2. Mapped memory can never become `locked' between
+ other chunks, as can happen with normally allocated chunks, which
+ means that even trimming via malloc_trim would not release them.
+ 3. On some systems with "holes" in address spaces, mmap can obtain
+ memory that sbrk cannot.
+
+ However, it has the disadvantages that:
+
+ 1. The space cannot be reclaimed, consolidated, and then
+ used to service later requests, as happens with normal chunks.
+ 2. It can lead to more wastage because of mmap page alignment
+ requirements
+ 3. It causes malloc performance to be more dependent on host
+ system memory management support routines which may vary in
+ implementation quality and may impose arbitrary
+ limitations. Generally, servicing a request via normal
+ malloc steps is faster than going through a system's mmap.
+
+ The advantages of mmap nearly always outweigh disadvantages for
+ "large" chunks, but the value of "large" varies across systems. The
+ default is an empirically derived value that works well in most
+ systems.
+*/
+#define M_MMAP_THRESHOLD -3
+
+#ifndef DEFAULT_MMAP_THRESHOLD
+#define DEFAULT_MMAP_THRESHOLD (256 * 1024)
+#endif
+
+/*
+ M_MMAP_MAX is the maximum number of requests to simultaneously
+ service using mmap. This parameter exists because
+. Some systems have a limited number of internal tables for
+ use by mmap, and using more than a few of them may degrade
+ performance.
+
+ The default is set to a value that serves only as a safeguard.
+ Setting to 0 disables use of mmap for servicing large requests. If
+ HAVE_MMAP is not set, the default value is 0, and attempts to set it
+ to non-zero values in mallopt will fail.
+*/
+#define M_MMAP_MAX -4
+
+#ifndef DEFAULT_MMAP_MAX
+#define DEFAULT_MMAP_MAX (65536)
+#endif
+
+
+/* ------------------ MMAP support ------------------ */
+#include <fcntl.h>
+#include <sys/mman.h>
+
+#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
+#define MAP_ANONYMOUS MAP_ANON
+#endif
+
+#define MMAP(addr, size, prot, flags) \
+ (mmap((addr), (size), (prot), (flags)|MAP_ANONYMOUS, -1, 0))
+
+
+/* ----------------------- Chunk representations ----------------------- */
+
+
+/*
+ This struct declaration is misleading (but accurate and necessary).
+ It declares a "view" into memory allowing access to necessary
+ fields at known offsets from a given base. See explanation below.
+*/
+
+struct malloc_chunk {
+
+ size_t prev_size; /* Size of previous chunk (if free). */
+ size_t size; /* Size in bytes, including overhead. */
+
+ struct malloc_chunk* fd; /* double links -- used only if free. */
+ struct malloc_chunk* bk;
+};
+
+
+typedef struct malloc_chunk* mchunkptr;
+
+/*
+ malloc_chunk details:
+
+ (The following includes lightly edited explanations by Colin Plumb.)
+
+ Chunks of memory are maintained using a `boundary tag' method as
+ described in e.g., Knuth or Standish. (See the paper by Paul
+ Wilson ftp://ftp.cs.utexas.edu/pub/garbage/allocsrv.ps for a
+ survey of such techniques.) Sizes of free chunks are stored both
+ in the front of each chunk and at the end. This makes
+ consolidating fragmented chunks into bigger chunks very fast. The
+ size fields also hold bits representing whether chunks are free or
+ in use.
+
+ An allocated chunk looks like this:
+
+
+ chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Size of previous chunk, if allocated | |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Size of chunk, in bytes |P|
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | User data starts here... .
+ . .
+ . (malloc_usable_space() bytes) .
+ . |
+nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Size of chunk |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+
+ Where "chunk" is the front of the chunk for the purpose of most of
+ the malloc code, but "mem" is the pointer that is returned to the
+ user. "Nextchunk" is the beginning of the next contiguous chunk.
+
+ Chunks always begin on even word boundries, so the mem portion
+ (which is returned to the user) is also on an even word boundary, and
+ thus at least double-word aligned.
+
+ Free chunks are stored in circular doubly-linked lists, and look like this:
+
+ chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Size of previous chunk |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ `head:' | Size of chunk, in bytes |P|
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Forward pointer to next chunk in list |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Back pointer to previous chunk in list |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Unused space (may be 0 bytes long) .
+ . .
+ . |
+nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ `foot:' | Size of chunk, in bytes |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+ The P (PREV_INUSE) bit, stored in the unused low-order bit of the
+ chunk size (which is always a multiple of two words), is an in-use
+ bit for the *previous* chunk. If that bit is *clear*, then the
+ word before the current chunk size contains the previous chunk
+ size, and can be used to find the front of the previous chunk.
+ The very first chunk allocated always has this bit set,
+ preventing access to non-existent (or non-owned) memory. If
+ prev_inuse is set for any given chunk, then you CANNOT determine
+ the size of the previous chunk, and might even get a memory
+ addressing fault when trying to do so.
+
+ Note that the `foot' of the current chunk is actually represented
+ as the prev_size of the NEXT chunk. This makes it easier to
+ deal with alignments etc but can be very confusing when trying
+ to extend or adapt this code.
+
+ The two exceptions to all this are
+
+ 1. The special chunk `top' doesn't bother using the
+ trailing size field since there is no next contiguous chunk
+ that would have to index off it. After initialization, `top'
+ is forced to always exist. If it would become less than
+ MINSIZE bytes long, it is replenished.
+
+ 2. Chunks allocated via mmap, which have the second-lowest-order
+ bit (IS_MMAPPED) set in their size fields. Because they are
+ allocated one-by-one, each must contain its own trailing size field.
+
+*/
+
+/*
+ ---------- Size and alignment checks and conversions ----------
+*/
+
+/* conversion from malloc headers to user pointers, and back */
+
+#define chunk2mem(p) ((void*)((char*)(p) + 2*(sizeof(size_t))))
+#define mem2chunk(mem) ((mchunkptr)((char*)(mem) - 2*(sizeof(size_t))))
+
+/* The smallest possible chunk */
+#define MIN_CHUNK_SIZE (sizeof(struct malloc_chunk))
+
+/* The smallest size we can malloc is an aligned minimal chunk */
+
+#define MINSIZE \
+ (unsigned long)(((MIN_CHUNK_SIZE+MALLOC_ALIGN_MASK) & ~MALLOC_ALIGN_MASK))
+
+/* Check if m has acceptable alignment */
+
+#define aligned_OK(m) (((unsigned long)((m)) & (MALLOC_ALIGN_MASK)) == 0)
+
+
+/* Check if a request is so large that it would wrap around zero when
+ padded and aligned. To simplify some other code, the bound is made
+ low enough so that adding MINSIZE will also not wrap around sero.
+*/
+
+#define REQUEST_OUT_OF_RANGE(req) \
+ ((unsigned long)(req) >= \
+ (unsigned long)(size_t)(-2 * MINSIZE))
+
+/* pad request bytes into a usable size -- internal version */
+
+#define request2size(req) \
+ (((req) + (sizeof(size_t)) + MALLOC_ALIGN_MASK < MINSIZE) ? \
+ MINSIZE : \
+ ((req) + (sizeof(size_t)) + MALLOC_ALIGN_MASK) & ~MALLOC_ALIGN_MASK)
+
+/* Same, except also perform argument check */
+
+#define checked_request2size(req, sz) \
+ if (REQUEST_OUT_OF_RANGE(req)) { \
+ errno = ENOMEM; \
+ return 0; \
+ } \
+ (sz) = request2size(req);
+
+/*
+ --------------- Physical chunk operations ---------------
+*/
+
+
+/* size field is or'ed with PREV_INUSE when previous adjacent chunk in use */
+#define PREV_INUSE 0x1
+
+/* extract inuse bit of previous chunk */
+#define prev_inuse(p) ((p)->size & PREV_INUSE)
+
+
+/* size field is or'ed with IS_MMAPPED if the chunk was obtained with mmap() */
+#define IS_MMAPPED 0x2
+
+/* check for mmap()'ed chunk */
+#define chunk_is_mmapped(p) ((p)->size & IS_MMAPPED)
+
+/* Bits to mask off when extracting size
+
+ Note: IS_MMAPPED is intentionally not masked off from size field in
+ macros for which mmapped chunks should never be seen. This should
+ cause helpful core dumps to occur if it is tried by accident by
+ people extending or adapting this malloc.
+*/
+#define SIZE_BITS (PREV_INUSE|IS_MMAPPED)
+
+/* Get size, ignoring use bits */
+#define chunksize(p) ((p)->size & ~(SIZE_BITS))
+
+
+/* Ptr to next physical malloc_chunk. */
+#define next_chunk(p) ((mchunkptr)( ((char*)(p)) + ((p)->size & ~PREV_INUSE) ))
+
+/* Ptr to previous physical malloc_chunk */
+#define prev_chunk(p) ((mchunkptr)( ((char*)(p)) - ((p)->prev_size) ))
+
+/* Treat space at ptr + offset as a chunk */
+#define chunk_at_offset(p, s) ((mchunkptr)(((char*)(p)) + (s)))
+
+/* extract p's inuse bit */
+#define inuse(p)\
+((((mchunkptr)(((char*)(p))+((p)->size & ~PREV_INUSE)))->size) & PREV_INUSE)
+
+/* set/clear chunk as being inuse without otherwise disturbing */
+#define set_inuse(p)\
+((mchunkptr)(((char*)(p)) + ((p)->size & ~PREV_INUSE)))->size |= PREV_INUSE
+
+#define clear_inuse(p)\
+((mchunkptr)(((char*)(p)) + ((p)->size & ~PREV_INUSE)))->size &= ~(PREV_INUSE)
+
+
+/* check/set/clear inuse bits in known places */
+#define inuse_bit_at_offset(p, s)\
+ (((mchunkptr)(((char*)(p)) + (s)))->size & PREV_INUSE)
+
+#define set_inuse_bit_at_offset(p, s)\
+ (((mchunkptr)(((char*)(p)) + (s)))->size |= PREV_INUSE)
+
+#define clear_inuse_bit_at_offset(p, s)\
+ (((mchunkptr)(((char*)(p)) + (s)))->size &= ~(PREV_INUSE))
+
+
+/* Set size at head, without disturbing its use bit */
+#define set_head_size(p, s) ((p)->size = (((p)->size & PREV_INUSE) | (s)))
+
+/* Set size/use field */
+#define set_head(p, s) ((p)->size = (s))
+
+/* Set size at footer (only when chunk is not in use) */
+#define set_foot(p, s) (((mchunkptr)((char*)(p) + (s)))->prev_size = (s))
+
+
+/* -------------------- Internal data structures -------------------- */
+
+/*
+ Bins
+
+ An array of bin headers for free chunks. Each bin is doubly
+ linked. The bins are approximately proportionally (log) spaced.
+ There are a lot of these bins (128). This may look excessive, but
+ works very well in practice. Most bins hold sizes that are
+ unusual as malloc request sizes, but are more usual for fragments
+ and consolidated sets of chunks, which is what these bins hold, so
+ they can be found quickly. All procedures maintain the invariant
+ that no consolidated chunk physically borders another one, so each
+ chunk in a list is known to be preceeded and followed by either
+ inuse chunks or the ends of memory.
+
+ Chunks in bins are kept in size order, with ties going to the
+ approximately least recently used chunk. Ordering isn't needed
+ for the small bins, which all contain the same-sized chunks, but
+ facilitates best-fit allocation for larger chunks. These lists
+ are just sequential. Keeping them in order almost never requires
+ enough traversal to warrant using fancier ordered data
+ structures.
+
+ Chunks of the same size are linked with the most
+ recently freed at the front, and allocations are taken from the
+ back. This results in LRU (FIFO) allocation order, which tends
+ to give each chunk an equal opportunity to be consolidated with
+ adjacent freed chunks, resulting in larger free chunks and less
+ fragmentation.
+
+ To simplify use in double-linked lists, each bin header acts
+ as a malloc_chunk. This avoids special-casing for headers.
+ But to conserve space and improve locality, we allocate
+ only the fd/bk pointers of bins, and then use repositioning tricks
+ to treat these as the fields of a malloc_chunk*.
+*/
+
+typedef struct malloc_chunk* mbinptr;
+
+/* addressing -- note that bin_at(0) does not exist */
+#define bin_at(m, i) ((mbinptr)((char*)&((m)->bins[(i)<<1]) - ((sizeof(size_t))<<1)))
+
+/* analog of ++bin */
+#define next_bin(b) ((mbinptr)((char*)(b) + (sizeof(mchunkptr)<<1)))
+
+/* Reminders about list directionality within bins */
+#define first(b) ((b)->fd)
+#define last(b) ((b)->bk)
+
+/* Take a chunk off a bin list */
+#define unlink(P, BK, FD) { \
+ FD = P->fd; \
+ BK = P->bk; \
+ FD->bk = BK; \
+ BK->fd = FD; \
+}
+
+/*
+ Indexing
+
+ Bins for sizes < 512 bytes contain chunks of all the same size, spaced
+ 8 bytes apart. Larger bins are approximately logarithmically spaced:
+
+ 64 bins of size 8
+ 32 bins of size 64
+ 16 bins of size 512
+ 8 bins of size 4096
+ 4 bins of size 32768
+ 2 bins of size 262144
+ 1 bin of size what's left
+
+ The bins top out around 1MB because we expect to service large
+ requests via mmap.
+*/
+
+#define NBINS 96
+#define NSMALLBINS 32
+#define SMALLBIN_WIDTH 8
+#define MIN_LARGE_SIZE 256
+
+#define in_smallbin_range(sz) \
+ ((unsigned long)(sz) < (unsigned long)MIN_LARGE_SIZE)
+
+#define smallbin_index(sz) (((unsigned)(sz)) >> 3)
+
+#define bin_index(sz) \
+ ((in_smallbin_range(sz)) ? smallbin_index(sz) : __malloc_largebin_index(sz))
+
+/*
+ FIRST_SORTED_BIN_SIZE is the chunk size corresponding to the
+ first bin that is maintained in sorted order. This must
+ be the smallest size corresponding to a given bin.
+
+ Normally, this should be MIN_LARGE_SIZE. But you can weaken
+ best fit guarantees to sometimes speed up malloc by increasing value.
+ Doing this means that malloc may choose a chunk that is
+ non-best-fitting by up to the width of the bin.
+
+ Some useful cutoff values:
+ 512 - all bins sorted
+ 2560 - leaves bins <= 64 bytes wide unsorted
+ 12288 - leaves bins <= 512 bytes wide unsorted
+ 65536 - leaves bins <= 4096 bytes wide unsorted
+ 262144 - leaves bins <= 32768 bytes wide unsorted
+ -1 - no bins sorted (not recommended!)
+*/
+
+#define FIRST_SORTED_BIN_SIZE MIN_LARGE_SIZE
+/* #define FIRST_SORTED_BIN_SIZE 65536 */
+
+/*
+ Unsorted chunks
+
+ All remainders from chunk splits, as well as all returned chunks,
+ are first placed in the "unsorted" bin. They are then placed
+ in regular bins after malloc gives them ONE chance to be used before
+ binning. So, basically, the unsorted_chunks list acts as a queue,
+ with chunks being placed on it in free (and __malloc_consolidate),
+ and taken off (to be either used or placed in bins) in malloc.
+*/
+
+/* The otherwise unindexable 1-bin is used to hold unsorted chunks. */
+#define unsorted_chunks(M) (bin_at(M, 1))
+
+/*
+ Top
+
+ The top-most available chunk (i.e., the one bordering the end of
+ available memory) is treated specially. It is never included in
+ any bin, is used only if no other chunk is available, and is
+ released back to the system if it is very large (see
+ M_TRIM_THRESHOLD). Because top initially
+ points to its own bin with initial zero size, thus forcing
+ extension on the first malloc request, we avoid having any special
+ code in malloc to check whether it even exists yet. But we still
+ need to do so when getting memory from system, so we make
+ initial_top treat the bin as a legal but unusable chunk during the
+ interval between initialization and the first call to
+ __malloc_alloc. (This is somewhat delicate, since it relies on
+ the 2 preceding words to be zero during this interval as well.)
+*/
+
+/* Conveniently, the unsorted bin can be used as dummy top on first call */
+#define initial_top(M) (unsorted_chunks(M))
+
+/*
+ Binmap
+
+ To help compensate for the large number of bins, a one-level index
+ structure is used for bin-by-bin searching. `binmap' is a
+ bitvector recording whether bins are definitely empty so they can
+ be skipped over during during traversals. The bits are NOT always
+ cleared as soon as bins are empty, but instead only
+ when they are noticed to be empty during traversal in malloc.
+*/
+
+/* Conservatively use 32 bits per map word, even if on 64bit system */
+#define BINMAPSHIFT 5
+#define BITSPERMAP (1U << BINMAPSHIFT)
+#define BINMAPSIZE (NBINS / BITSPERMAP)
+
+#define idx2block(i) ((i) >> BINMAPSHIFT)
+#define idx2bit(i) ((1U << ((i) & ((1U << BINMAPSHIFT)-1))))
+
+#define mark_bin(m,i) ((m)->binmap[idx2block(i)] |= idx2bit(i))
+#define unmark_bin(m,i) ((m)->binmap[idx2block(i)] &= ~(idx2bit(i)))
+#define get_binmap(m,i) ((m)->binmap[idx2block(i)] & idx2bit(i))
+
+/*
+ Fastbins
+
+ An array of lists holding recently freed small chunks. Fastbins
+ are not doubly linked. It is faster to single-link them, and
+ since chunks are never removed from the middles of these lists,
+ double linking is not necessary. Also, unlike regular bins, they
+ are not even processed in FIFO order (they use faster LIFO) since
+ ordering doesn't much matter in the transient contexts in which
+ fastbins are normally used.
+
+ Chunks in fastbins keep their inuse bit set, so they cannot
+ be consolidated with other free chunks. __malloc_consolidate
+ releases all chunks in fastbins and consolidates them with
+ other free chunks.
+*/
+
+typedef struct malloc_chunk* mfastbinptr;
+
+/* offset 2 to use otherwise unindexable first 2 bins */
+#define fastbin_index(sz) ((((unsigned int)(sz)) >> 3) - 2)
+
+/* The maximum fastbin request size we support */
+#define MAX_FAST_SIZE 80
+
+#define NFASTBINS (fastbin_index(request2size(MAX_FAST_SIZE))+1)
+
+/*
+ FASTBIN_CONSOLIDATION_THRESHOLD is the size of a chunk in free()
+ that triggers automatic consolidation of possibly-surrounding
+ fastbin chunks. This is a heuristic, so the exact value should not
+ matter too much. It is defined at half the default trim threshold as a
+ compromise heuristic to only attempt consolidation if it is likely
+ to lead to trimming. However, it is not dynamically tunable, since
+ consolidation reduces fragmentation surrounding loarge chunks even
+ if trimming is not used.
+*/
+
+#define FASTBIN_CONSOLIDATION_THRESHOLD \
+ ((unsigned long)(DEFAULT_TRIM_THRESHOLD) >> 1)
+
+/*
+ Since the lowest 2 bits in max_fast don't matter in size comparisons,
+ they are used as flags.
+*/
+
+/*
+ ANYCHUNKS_BIT held in max_fast indicates that there may be any
+ freed chunks at all. It is set true when entering a chunk into any
+ bin.
+*/
+
+#define ANYCHUNKS_BIT (1U)
+
+#define have_anychunks(M) (((M)->max_fast & ANYCHUNKS_BIT))
+#define set_anychunks(M) ((M)->max_fast |= ANYCHUNKS_BIT)
+#define clear_anychunks(M) ((M)->max_fast &= ~ANYCHUNKS_BIT)
+
+/*
+ FASTCHUNKS_BIT held in max_fast indicates that there are probably
+ some fastbin chunks. It is set true on entering a chunk into any
+ fastbin, and cleared only in __malloc_consolidate.
+*/
+
+#define FASTCHUNKS_BIT (2U)
+
+#define have_fastchunks(M) (((M)->max_fast & FASTCHUNKS_BIT))
+#define set_fastchunks(M) ((M)->max_fast |= (FASTCHUNKS_BIT|ANYCHUNKS_BIT))
+#define clear_fastchunks(M) ((M)->max_fast &= ~(FASTCHUNKS_BIT))
+
+/* Set value of max_fast. Use impossibly small value if 0. */
+#define set_max_fast(M, s) \
+ (M)->max_fast = (((s) == 0)? SMALLBIN_WIDTH: request2size(s)) | \
+ ((M)->max_fast & (FASTCHUNKS_BIT|ANYCHUNKS_BIT))
+
+#define get_max_fast(M) \
+ ((M)->max_fast & ~(FASTCHUNKS_BIT | ANYCHUNKS_BIT))
+
+
+/*
+ morecore_properties is a status word holding dynamically discovered
+ or controlled properties of the morecore function
+*/
+
+#define MORECORE_CONTIGUOUS_BIT (1U)
+
+#define contiguous(M) \
+ (((M)->morecore_properties & MORECORE_CONTIGUOUS_BIT))
+#define noncontiguous(M) \
+ (((M)->morecore_properties & MORECORE_CONTIGUOUS_BIT) == 0)
+#define set_contiguous(M) \
+ ((M)->morecore_properties |= MORECORE_CONTIGUOUS_BIT)
+#define set_noncontiguous(M) \
+ ((M)->morecore_properties &= ~MORECORE_CONTIGUOUS_BIT)
+
+
+/*
+ ----------- Internal state representation and initialization -----------
+*/
+
+struct malloc_state {
+
+ /* The maximum chunk size to be eligible for fastbin */
+ size_t max_fast; /* low 2 bits used as flags */
+
+ /* Fastbins */
+ mfastbinptr fastbins[NFASTBINS];
+
+ /* Base of the topmost chunk -- not otherwise kept in a bin */
+ mchunkptr top;
+
+ /* The remainder from the most recent split of a small request */
+ mchunkptr last_remainder;
+
+ /* Normal bins packed as described above */
+ mchunkptr bins[NBINS * 2];
+
+ /* Bitmap of bins. Trailing zero map handles cases of largest binned size */
+ unsigned int binmap[BINMAPSIZE+1];
+
+ /* Tunable parameters */
+ unsigned long trim_threshold;
+ size_t top_pad;
+ size_t mmap_threshold;
+
+ /* Memory map support */
+ int n_mmaps;
+ int n_mmaps_max;
+ int max_n_mmaps;
+
+ /* Cache malloc_getpagesize */
+ unsigned int pagesize;
+
+ /* Track properties of MORECORE */
+ unsigned int morecore_properties;
+
+ /* Statistics */
+ size_t mmapped_mem;
+ size_t sbrked_mem;
+ size_t max_sbrked_mem;
+ size_t max_mmapped_mem;
+ size_t max_total_mem;
+};
+
+typedef struct malloc_state *mstate;
+
+/*
+ There is exactly one instance of this struct in this malloc.
+ If you are adapting this malloc in a way that does NOT use a static
+ malloc_state, you MUST explicitly zero-fill it before using. This
+ malloc relies on the property that malloc_state is initialized to
+ all zeroes (as is true of C statics).
+*/
+extern struct malloc_state __malloc_state; /* never directly referenced */
+
+/*
+ All uses of av_ are via get_malloc_state().
+ At most one "call" to get_malloc_state is made per invocation of
+ the public versions of malloc and free, but other routines
+ that in turn invoke malloc and/or free may call more then once.
+ Also, it is called in check* routines if __MALLOC_DEBUGGING is set.
+*/
+
+#define get_malloc_state() (&(__malloc_state))
+
+/* External internal utilities operating on mstates */
+void __malloc_consolidate(mstate);
+
+
+/* Debugging support */
+#if ! __MALLOC_DEBUGGING
+
+#define check_chunk(P)
+#define check_free_chunk(P)
+#define check_inuse_chunk(P)
+#define check_remalloced_chunk(P,N)
+#define check_malloced_chunk(P,N)
+#define check_malloc_state()
+#define assert(x) ((void)0)
+
+
+#else
+
+#define check_chunk(P) __do_check_chunk(P)
+#define check_free_chunk(P) __do_check_free_chunk(P)
+#define check_inuse_chunk(P) __do_check_inuse_chunk(P)
+#define check_remalloced_chunk(P,N) __do_check_remalloced_chunk(P,N)
+#define check_malloced_chunk(P,N) __do_check_malloced_chunk(P,N)
+#define check_malloc_state() __do_check_malloc_state()
+
+extern void __do_check_chunk(mchunkptr p);
+extern void __do_check_free_chunk(mchunkptr p);
+extern void __do_check_inuse_chunk(mchunkptr p);
+extern void __do_check_remalloced_chunk(mchunkptr p, size_t s);
+extern void __do_check_malloced_chunk(mchunkptr p, size_t s);
+extern void __do_check_malloc_state(void);
+
+#include <assert.h>
+
+#endif
diff --git a/libc/stdlib/malloc-standard/mallopt.c b/libc/stdlib/malloc-standard/mallopt.c
new file mode 100644
index 000000000..e28792099
--- /dev/null
+++ b/libc/stdlib/malloc-standard/mallopt.c
@@ -0,0 +1,64 @@
+/*
+ This is a version (aka dlmalloc) of malloc/free/realloc written by
+ Doug Lea and released to the public domain. Use, modify, and
+ redistribute this code without permission or acknowledgement in any
+ way you wish. Send questions, comments, complaints, performance
+ data, etc to dl@cs.oswego.edu
+
+ VERSION 2.7.2 Sat Aug 17 09:07:30 2002 Doug Lea (dl at gee)
+
+ Note: There may be an updated version of this malloc obtainable at
+ ftp://gee.cs.oswego.edu/pub/misc/malloc.c
+ Check before installing!
+
+ Hacked up for uClibc by Erik Andersen <andersen@codepoet.org>
+*/
+
+#include "malloc.h"
+
+
+/* ------------------------------ mallopt ------------------------------ */
+int mallopt(int param_number, int value)
+{
+ int ret;
+ mstate av;
+
+ ret = 0;
+
+ LOCK;
+ av = get_malloc_state();
+ /* Ensure initialization/consolidation */
+ __malloc_consolidate(av);
+
+ switch(param_number) {
+ case M_MXFAST:
+ if (value >= 0 && value <= MAX_FAST_SIZE) {
+ set_max_fast(av, value);
+ ret = 1;
+ }
+ break;
+
+ case M_TRIM_THRESHOLD:
+ av->trim_threshold = value;
+ ret = 1;
+ break;
+
+ case M_TOP_PAD:
+ av->top_pad = value;
+ ret = 1;
+ break;
+
+ case M_MMAP_THRESHOLD:
+ av->mmap_threshold = value;
+ ret = 1;
+ break;
+
+ case M_MMAP_MAX:
+ av->n_mmaps_max = value;
+ ret = 1;
+ break;
+ }
+ UNLOCK;
+ return ret;
+}
+
diff --git a/libc/stdlib/malloc-standard/memalign.c b/libc/stdlib/malloc-standard/memalign.c
new file mode 100644
index 000000000..bd9536272
--- /dev/null
+++ b/libc/stdlib/malloc-standard/memalign.c
@@ -0,0 +1,126 @@
+/*
+ This is a version (aka dlmalloc) of malloc/free/realloc written by
+ Doug Lea and released to the public domain. Use, modify, and
+ redistribute this code without permission or acknowledgement in any
+ way you wish. Send questions, comments, complaints, performance
+ data, etc to dl@cs.oswego.edu
+
+ VERSION 2.7.2 Sat Aug 17 09:07:30 2002 Doug Lea (dl at gee)
+
+ Note: There may be an updated version of this malloc obtainable at
+ ftp://gee.cs.oswego.edu/pub/misc/malloc.c
+ Check before installing!
+
+ Hacked up for uClibc by Erik Andersen <andersen@codepoet.org>
+*/
+
+#include <features.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include "malloc.h"
+
+
+/* ------------------------------ memalign ------------------------------ */
+void* memalign(size_t alignment, size_t bytes)
+{
+ size_t nb; /* padded request size */
+ char* m; /* memory returned by malloc call */
+ mchunkptr p; /* corresponding chunk */
+ char* brk; /* alignment point within p */
+ mchunkptr newp; /* chunk to return */
+ size_t newsize; /* its size */
+ size_t leadsize; /* leading space before alignment point */
+ mchunkptr remainder; /* spare room at end to split off */
+ unsigned long remainder_size; /* its size */
+ size_t size;
+
+ /* If need less alignment than we give anyway, just relay to malloc */
+
+ if (alignment <= MALLOC_ALIGNMENT) return malloc(bytes);
+
+ /* Otherwise, ensure that it is at least a minimum chunk size */
+
+ if (alignment < MINSIZE) alignment = MINSIZE;
+
+ /* Make sure alignment is power of 2 (in case MINSIZE is not). */
+ if ((alignment & (alignment - 1)) != 0) {
+ size_t a = MALLOC_ALIGNMENT * 2;
+ while ((unsigned long)a < (unsigned long)alignment) a <<= 1;
+ alignment = a;
+ }
+
+ LOCK;
+ checked_request2size(bytes, nb);
+
+ /* Strategy: find a spot within that chunk that meets the alignment
+ * request, and then possibly free the leading and trailing space. */
+
+
+ /* Call malloc with worst case padding to hit alignment. */
+
+ m = (char*)(malloc(nb + alignment + MINSIZE));
+
+ if (m == 0) {
+ UNLOCK;
+ return 0; /* propagate failure */
+ }
+
+ p = mem2chunk(m);
+
+ if ((((unsigned long)(m)) % alignment) != 0) { /* misaligned */
+
+ /*
+ Find an aligned spot inside chunk. Since we need to give back
+ leading space in a chunk of at least MINSIZE, if the first
+ calculation places us at a spot with less than MINSIZE leader,
+ we can move to the next aligned spot -- we've allocated enough
+ total room so that this is always possible.
+ */
+
+ brk = (char*)mem2chunk((unsigned long)(((unsigned long)(m + alignment - 1)) &
+ -((signed long) alignment)));
+ if ((unsigned long)(brk - (char*)(p)) < MINSIZE)
+ brk += alignment;
+
+ newp = (mchunkptr)brk;
+ leadsize = brk - (char*)(p);
+ newsize = chunksize(p) - leadsize;
+
+ /* For mmapped chunks, just adjust offset */
+ if (chunk_is_mmapped(p)) {
+ newp->prev_size = p->prev_size + leadsize;
+ set_head(newp, newsize|IS_MMAPPED);
+ UNLOCK;
+ return chunk2mem(newp);
+ }
+
+ /* Otherwise, give back leader, use the rest */
+ set_head(newp, newsize | PREV_INUSE);
+ set_inuse_bit_at_offset(newp, newsize);
+ set_head_size(p, leadsize);
+ free(chunk2mem(p));
+ p = newp;
+
+ assert (newsize >= nb &&
+ (((unsigned long)(chunk2mem(p))) % alignment) == 0);
+ }
+
+ /* Also give back spare room at the end */
+ if (!chunk_is_mmapped(p)) {
+ size = chunksize(p);
+ if ((unsigned long)(size) > (unsigned long)(nb + MINSIZE)) {
+ remainder_size = size - nb;
+ remainder = chunk_at_offset(p, nb);
+ set_head(remainder, remainder_size | PREV_INUSE);
+ set_head_size(p, nb);
+ free(chunk2mem(remainder));
+ }
+ }
+
+ check_inuse_chunk(p);
+ UNLOCK;
+ return chunk2mem(p);
+}
+
diff --git a/libc/stdlib/malloc-standard/realloc.c b/libc/stdlib/malloc-standard/realloc.c
new file mode 100644
index 000000000..195013095
--- /dev/null
+++ b/libc/stdlib/malloc-standard/realloc.c
@@ -0,0 +1,237 @@
+/*
+ This is a version (aka dlmalloc) of malloc/free/realloc written by
+ Doug Lea and released to the public domain. Use, modify, and
+ redistribute this code without permission or acknowledgement in any
+ way you wish. Send questions, comments, complaints, performance
+ data, etc to dl@cs.oswego.edu
+
+ VERSION 2.7.2 Sat Aug 17 09:07:30 2002 Doug Lea (dl at gee)
+
+ Note: There may be an updated version of this malloc obtainable at
+ ftp://gee.cs.oswego.edu/pub/misc/malloc.c
+ Check before installing!
+
+ Hacked up for uClibc by Erik Andersen <andersen@codepoet.org>
+*/
+
+#include "malloc.h"
+
+
+
+/* ------------------------------ realloc ------------------------------ */
+void* realloc(void* oldmem, size_t bytes)
+{
+ mstate av;
+
+ size_t nb; /* padded request size */
+
+ mchunkptr oldp; /* chunk corresponding to oldmem */
+ size_t oldsize; /* its size */
+
+ mchunkptr newp; /* chunk to return */
+ size_t newsize; /* its size */
+ void* newmem; /* corresponding user mem */
+
+ mchunkptr next; /* next contiguous chunk after oldp */
+
+ mchunkptr remainder; /* extra space at end of newp */
+ unsigned long remainder_size; /* its size */
+
+ mchunkptr bck; /* misc temp for linking */
+ mchunkptr fwd; /* misc temp for linking */
+
+ unsigned long copysize; /* bytes to copy */
+ unsigned int ncopies; /* size_t words to copy */
+ size_t* s; /* copy source */
+ size_t* d; /* copy destination */
+
+
+ /* Check for special cases. */
+ if (! oldmem)
+ return malloc(bytes);
+ if (! bytes) {
+ free (oldmem);
+ return malloc(bytes);
+ }
+
+ LOCK;
+ av = get_malloc_state();
+ checked_request2size(bytes, nb);
+
+ oldp = mem2chunk(oldmem);
+ oldsize = chunksize(oldp);
+
+ check_inuse_chunk(oldp);
+
+ if (!chunk_is_mmapped(oldp)) {
+
+ if ((unsigned long)(oldsize) >= (unsigned long)(nb)) {
+ /* already big enough; split below */
+ newp = oldp;
+ newsize = oldsize;
+ }
+
+ else {
+ next = chunk_at_offset(oldp, oldsize);
+
+ /* Try to expand forward into top */
+ if (next == av->top &&
+ (unsigned long)(newsize = oldsize + chunksize(next)) >=
+ (unsigned long)(nb + MINSIZE)) {
+ set_head_size(oldp, nb);
+ av->top = chunk_at_offset(oldp, nb);
+ set_head(av->top, (newsize - nb) | PREV_INUSE);
+ UNLOCK;
+ return chunk2mem(oldp);
+ }
+
+ /* Try to expand forward into next chunk; split off remainder below */
+ else if (next != av->top &&
+ !inuse(next) &&
+ (unsigned long)(newsize = oldsize + chunksize(next)) >=
+ (unsigned long)(nb)) {
+ newp = oldp;
+ unlink(next, bck, fwd);
+ }
+
+ /* allocate, copy, free */
+ else {
+ newmem = malloc(nb - MALLOC_ALIGN_MASK);
+ if (newmem == 0) {
+ UNLOCK;
+ return 0; /* propagate failure */
+ }
+
+ newp = mem2chunk(newmem);
+ newsize = chunksize(newp);
+
+ /*
+ Avoid copy if newp is next chunk after oldp.
+ */
+ if (newp == next) {
+ newsize += oldsize;
+ newp = oldp;
+ }
+ else {
+ /*
+ Unroll copy of <= 36 bytes (72 if 8byte sizes)
+ We know that contents have an odd number of
+ size_t-sized words; minimally 3.
+ */
+
+ copysize = oldsize - (sizeof(size_t));
+ s = (size_t*)(oldmem);
+ d = (size_t*)(newmem);
+ ncopies = copysize / sizeof(size_t);
+ assert(ncopies >= 3);
+
+ if (ncopies > 9)
+ memcpy(d, s, copysize);
+
+ else {
+ *(d+0) = *(s+0);
+ *(d+1) = *(s+1);
+ *(d+2) = *(s+2);
+ if (ncopies > 4) {
+ *(d+3) = *(s+3);
+ *(d+4) = *(s+4);
+ if (ncopies > 6) {
+ *(d+5) = *(s+5);
+ *(d+6) = *(s+6);
+ if (ncopies > 8) {
+ *(d+7) = *(s+7);
+ *(d+8) = *(s+8);
+ }
+ }
+ }
+ }
+
+ free(oldmem);
+ check_inuse_chunk(newp);
+ UNLOCK;
+ return chunk2mem(newp);
+ }
+ }
+ }
+
+ /* If possible, free extra space in old or extended chunk */
+
+ assert((unsigned long)(newsize) >= (unsigned long)(nb));
+
+ remainder_size = newsize - nb;
+
+ if (remainder_size < MINSIZE) { /* not enough extra to split off */
+ set_head_size(newp, newsize);
+ set_inuse_bit_at_offset(newp, newsize);
+ }
+ else { /* split remainder */
+ remainder = chunk_at_offset(newp, nb);
+ set_head_size(newp, nb);
+ set_head(remainder, remainder_size | PREV_INUSE);
+ /* Mark remainder as inuse so free() won't complain */
+ set_inuse_bit_at_offset(remainder, remainder_size);
+ free(chunk2mem(remainder));
+ }
+
+ check_inuse_chunk(newp);
+ UNLOCK;
+ return chunk2mem(newp);
+ }
+
+ /*
+ Handle mmap cases
+ */
+
+ else {
+ size_t offset = oldp->prev_size;
+ size_t pagemask = av->pagesize - 1;
+ char *cp;
+ unsigned long sum;
+
+ /* Note the extra (sizeof(size_t)) overhead */
+ newsize = (nb + offset + (sizeof(size_t)) + pagemask) & ~pagemask;
+
+ /* don't need to remap if still within same page */
+ if (oldsize == newsize - offset) {
+ UNLOCK;
+ return oldmem;
+ }
+
+ cp = (char*)mremap((char*)oldp - offset, oldsize + offset, newsize, 1);
+
+ if (cp != (char*)MORECORE_FAILURE) {
+
+ newp = (mchunkptr)(cp + offset);
+ set_head(newp, (newsize - offset)|IS_MMAPPED);
+
+ assert(aligned_OK(chunk2mem(newp)));
+ assert((newp->prev_size == offset));
+
+ /* update statistics */
+ sum = av->mmapped_mem += newsize - oldsize;
+ if (sum > (unsigned long)(av->max_mmapped_mem))
+ av->max_mmapped_mem = sum;
+ sum += av->sbrked_mem;
+ if (sum > (unsigned long)(av->max_total_mem))
+ av->max_total_mem = sum;
+
+ UNLOCK;
+ return chunk2mem(newp);
+ }
+
+ /* Note the extra (sizeof(size_t)) overhead. */
+ if ((unsigned long)(oldsize) >= (unsigned long)(nb + (sizeof(size_t))))
+ newmem = oldmem; /* do nothing */
+ else {
+ /* Must alloc, copy, free. */
+ newmem = malloc(nb - MALLOC_ALIGN_MASK);
+ if (newmem != 0) {
+ memcpy(newmem, oldmem, oldsize - 2*(sizeof(size_t)));
+ free(oldmem);
+ }
+ }
+ UNLOCK;
+ return newmem;
+ }
+}
+
diff --git a/libc/stdlib/malloc/Makefile b/libc/stdlib/malloc/Makefile
index 7172198f2..ce789f8e8 100644
--- a/libc/stdlib/malloc/Makefile
+++ b/libc/stdlib/malloc/Makefile
@@ -24,8 +24,7 @@
TOPDIR=../../../
include $(TOPDIR)Rules.mak
-# calloc.c can be found at uClibc/libc/stdlib/calloc.c
-CSRC = malloc.c free.c realloc.c memalign.c \
+CSRC = malloc.c calloc.c free.c realloc.c memalign.c \
heap_alloc.c heap_alloc_at.c heap_free.c
# Turn on malloc debugging if requested
diff --git a/libc/stdlib/calloc.c b/libc/stdlib/malloc/calloc.c
index 15281a97f..15281a97f 100644
--- a/libc/stdlib/calloc.c
+++ b/libc/stdlib/malloc/calloc.c