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ardour/libs/pbd/tlsf.cc
John Emmas 40cca52bbb Changes needed for building with MSVC 
Mostly these are to do with TLSF which I hadn't in fact been building!! Hopefully there won't be any problems for the gcc builds.
2020-02-07 11:27:22 +00:00

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/*
* Two Levels Segregate Fit memory allocator (TLSF)
* Version 2.4.6
*
* Written by Miguel Masmano Tello <mimastel@doctor.upv.es>
*
* Thanks to Ismael Ripoll for his suggestions and reviews
*
* Copyright (C) 2008, 2007, 2006, 2005, 2004
*
* This code is released using a dual license strategy: GPL/LGPL
* You can choose the licence that better fits your requirements.
*
* Released under the terms of the GNU General Public License Version 2.0
* Released under the terms of the GNU Lesser General Public License Version 2.1
*
*/
/*
* Code contributions:
*
* (Jul 28 2007) Herman ten Brugge <hermantenbrugge@home.nl>:
*
* - Add 64 bit support. It now runs on x86_64 and solaris64.
* - I also tested this on vxworks/32and solaris/32 and i386/32 processors.
* - Remove assembly code. I could not measure any performance difference
* on my core2 processor. This also makes the code more portable.
* - Moved defines/typedefs from tlsf.h to tlsf.c
* - Changed MIN_BLOCK_SIZE to sizeof (free_ptr_t) and BHDR_OVERHEAD to
* (sizeof (bhdr_t) - MIN_BLOCK_SIZE). This does not change the fact
* that the minumum size is still sizeof
* (bhdr_t).
* - Changed all C++ comment style to C style. (// -> /.* ... *./)
* - Used ls_bit instead of ffs and ms_bit instead of fls. I did this to
* avoid confusion with the standard ffs function which returns
* different values.
* - Created set_bit/clear_bit fuctions because they are not present
* on x86_64.
* - Added locking support + extra file target.h to show how to use it.
* - Added get_used_size function (REMOVED in 2.4)
* - Added rtl_realloc and rtl_calloc function
* - Implemented realloc clever support.
* - Added some test code in the example directory.
* - Bug fixed (discovered by the rockbox project: www.rockbox.org).
*
* (Oct 23 2006) Adam Scislowicz:
*
* - Support for ARMv5 implemented
*
*/
//#define TLSF_STATISTIC 1
#ifndef USE_PRINTF
#if TLSF_STATISTIC
#define USE_PRINTF (1)
#endif
#endif
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#ifndef TLSF_STATISTIC
#define TLSF_STATISTIC (0)
#endif
#if TLSF_STATISTIC
#define TLSF_ADD_SIZE(tlsf, b) do { \
tlsf->used_size += (b->size & BLOCK_SIZE) + BHDR_OVERHEAD; \
if (tlsf->used_size > tlsf->max_size) \
tlsf->max_size = tlsf->used_size; \
} while(0)
#define TLSF_REMOVE_SIZE(tlsf, b) do { \
tlsf->used_size -= (b->size & BLOCK_SIZE) + BHDR_OVERHEAD; \
} while(0)
#else
#define TLSF_ADD_SIZE(tlsf, b) do{}while(0)
#define TLSF_REMOVE_SIZE(tlsf, b) do{}while(0)
#endif
#include "pbd/tlsf.h"
#if !defined(__GNUC__)
#ifndef __inline__
#define __inline__
#endif
#endif
/* The debug functions only can be used when _DEBUG_TLSF_ is set. */
#ifndef _DEBUG_TLSF_
#define _DEBUG_TLSF_ (0)
#endif
/*************************************************************************/
/* Definition of the structures used by TLSF */
/* Some IMPORTANT TLSF parameters */
/* Unlike the preview TLSF versions, now they are statics */
#define BLOCK_ALIGN (sizeof(void *) * 2)
#define MAX_FLI (30)
#define MAX_LOG2_SLI (5)
#define MAX_SLI (1 << MAX_LOG2_SLI) /* MAX_SLI = 2^MAX_LOG2_SLI */
#define FLI_OFFSET (6) /* tlsf structure just will manage blocks bigger */
/* than 128 bytes */
#define SMALL_BLOCK (128)
#define REAL_FLI (MAX_FLI - FLI_OFFSET)
#define MIN_BLOCK_SIZE (sizeof (free_ptr_t))
#define BHDR_OVERHEAD (sizeof (bhdr_t) - MIN_BLOCK_SIZE)
#define TLSF_SIGNATURE (0x2A59FA59)
#define PTR_MASK (sizeof(void *) - 1)
#define BLOCK_SIZE (0xFFFFFFFF - PTR_MASK)
#define GET_NEXT_BLOCK(_addr, _r) ((bhdr_t *) ((char *) (_addr) + (_r)))
#define MEM_ALIGN ((BLOCK_ALIGN) - 1)
#define ROUNDUP_SIZE(_r) (((_r) + MEM_ALIGN) & ~MEM_ALIGN)
#define ROUNDDOWN_SIZE(_r) ((_r) & ~MEM_ALIGN)
#define ROUNDUP(_x, _v) ((((~(_x)) + 1) & ((_v)-1)) + (_x))
#define BLOCK_STATE (0x1)
#define PREV_STATE (0x2)
/* bit 0 of the block size */
#define FREE_BLOCK (0x1)
#define USED_BLOCK (0x0)
/* bit 1 of the block size */
#define PREV_FREE (0x2)
#define PREV_USED (0x0)
#ifdef USE_PRINTF
#include <stdio.h>
# define PRINT_MSG(fmt, args...) printf(fmt, ## args)
# define ERROR_MSG(fmt, args...) printf(fmt, ## args)
#else
# if !defined(PRINT_MSG)
# if TLSF_STATISTIC
# define PRINT_MSG(fmt, args...)
# endif
# endif
# if !defined(ERROR_MSG) && !defined(COMPILER_MSVC)
# define ERROR_MSG(fmt, args...)
# endif
#endif
typedef unsigned int u32_t; /* NOTE: Make sure that this type is 4 bytes long on your computer */
typedef unsigned char u8_t; /* NOTE: Make sure that this type is 1 byte on your computer */
typedef struct free_ptr_struct {
struct bhdr_struct *prev;
struct bhdr_struct *next;
} free_ptr_t;
typedef struct bhdr_struct {
/* This pointer is just valid if the first bit of size is set */
struct bhdr_struct *prev_hdr;
/* The size is stored in bytes */
size_t size; /* bit 0 indicates whether the block is used and */
/* bit 1 allows to know whether the previous block is free */
union {
struct free_ptr_struct free_ptr;
u8_t buffer[1]; /*sizeof(struct free_ptr_struct)]; */
} ptr;
} bhdr_t;
/* This structure is embedded at the beginning of each area, giving us
* enough information to cope with a set of areas */
typedef struct area_info_struct {
bhdr_t *end;
struct area_info_struct *next;
} area_info_t;
typedef struct TLSF_struct {
/* the TLSF's structure signature */
u32_t tlsf_signature;
#if TLSF_STATISTIC
/* These can not be calculated outside tlsf because we
* do not know the sizes when freeing/reallocing memory. */
size_t used_size;
size_t max_size;
#endif
/* A linked list holding all the existing areas */
area_info_t *area_head;
/* the first-level bitmap */
/* This array should have a size of REAL_FLI bits */
u32_t fl_bitmap;
/* the second-level bitmap */
u32_t sl_bitmap[REAL_FLI];
bhdr_t *matrix[REAL_FLI][MAX_SLI];
} tlsf_t;
/******************************************************************/
/************** Helping functions **************************/
/******************************************************************/
static __inline__ void set_bit(int nr, u32_t * addr);
static __inline__ void clear_bit(int nr, u32_t * addr);
static __inline__ int ls_bit(int x);
static __inline__ int ms_bit(int x);
static __inline__ void MAPPING_SEARCH(size_t * _r, int *_fl, int *_sl);
static __inline__ void MAPPING_INSERT(size_t _r, int *_fl, int *_sl);
static __inline__ bhdr_t *FIND_SUITABLE_BLOCK(tlsf_t * _tlsf, int *_fl, int *_sl);
static __inline__ bhdr_t *process_area(void *area, size_t size);
static const int table[] = {
-1, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4,
4, 4,
4, 4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5,
5, 5, 5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6,
6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6,
6, 6, 6, 6, 6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7,
7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7,
7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7,
7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7,
7, 7, 7, 7, 7, 7, 7
};
static __inline__ int ls_bit(int i)
{
unsigned int a;
unsigned int x = i & -i;
a = x <= 0xffff ? (x <= 0xff ? 0 : 8) : (x <= 0xffffff ? 16 : 24);
return table[x >> a] + a;
}
static __inline__ int ms_bit(int i)
{
unsigned int a;
unsigned int x = (unsigned int) i;
a = x <= 0xffff ? (x <= 0xff ? 0 : 8) : (x <= 0xffffff ? 16 : 24);
return table[x >> a] + a;
}
static __inline__ void set_bit(int nr, u32_t * addr)
{
addr[nr >> 5] |= 1 << (nr & 0x1f);
}
static __inline__ void clear_bit(int nr, u32_t * addr)
{
addr[nr >> 5] &= ~(1 << (nr & 0x1f));
}
static __inline__ void MAPPING_SEARCH(size_t * _r, int *_fl, int *_sl)
{
int _t;
if (*_r < SMALL_BLOCK) {
*_fl = 0;
*_sl = *_r / (SMALL_BLOCK / MAX_SLI);
} else {
_t = (1 << (ms_bit(*_r) - MAX_LOG2_SLI)) - 1;
*_r = *_r + _t;
*_fl = ms_bit(*_r);
*_sl = (*_r >> (*_fl - MAX_LOG2_SLI)) - MAX_SLI;
*_fl -= FLI_OFFSET;
/*if ((*_fl -= FLI_OFFSET) < 0) // FL wil be always >0!
*_fl = *_sl = 0;
*/
*_r &= ~_t;
}
}
static __inline__ void MAPPING_INSERT(size_t _r, int *_fl, int *_sl)
{
if (_r < SMALL_BLOCK) {
*_fl = 0;
*_sl = _r / (SMALL_BLOCK / MAX_SLI);
} else {
*_fl = ms_bit(_r);
*_sl = (_r >> (*_fl - MAX_LOG2_SLI)) - MAX_SLI;
*_fl -= FLI_OFFSET;
}
}
static __inline__ bhdr_t *FIND_SUITABLE_BLOCK(tlsf_t * _tlsf, int *_fl, int *_sl)
{
u32_t _tmp = _tlsf->sl_bitmap[*_fl] & (~0 << *_sl);
bhdr_t *_b = NULL;
if (_tmp) {
*_sl = ls_bit(_tmp);
_b = _tlsf->matrix[*_fl][*_sl];
} else {
*_fl = ls_bit(_tlsf->fl_bitmap & (~0 << (*_fl + 1)));
if (*_fl > 0) { /* likely */
*_sl = ls_bit(_tlsf->sl_bitmap[*_fl]);
_b = _tlsf->matrix[*_fl][*_sl];
}
}
return _b;
}
#define EXTRACT_BLOCK_HDR(_b, _tlsf, _fl, _sl) do { \
_tlsf -> matrix [_fl] [_sl] = _b -> ptr.free_ptr.next; \
if (_tlsf -> matrix[_fl][_sl]) \
_tlsf -> matrix[_fl][_sl] -> ptr.free_ptr.prev = NULL; \
else { \
clear_bit (_sl, &_tlsf -> sl_bitmap [_fl]); \
if (!_tlsf -> sl_bitmap [_fl]) \
clear_bit (_fl, &_tlsf -> fl_bitmap); \
} \
_b -> ptr.free_ptr.prev = NULL; \
_b -> ptr.free_ptr.next = NULL; \
}while(0)
#define EXTRACT_BLOCK(_b, _tlsf, _fl, _sl) do { \
if (_b -> ptr.free_ptr.next) \
_b -> ptr.free_ptr.next -> ptr.free_ptr.prev = _b -> ptr.free_ptr.prev; \
if (_b -> ptr.free_ptr.prev) \
_b -> ptr.free_ptr.prev -> ptr.free_ptr.next = _b -> ptr.free_ptr.next; \
if (_tlsf -> matrix [_fl][_sl] == _b) { \
_tlsf -> matrix [_fl][_sl] = _b -> ptr.free_ptr.next; \
if (!_tlsf -> matrix [_fl][_sl]) { \
clear_bit (_sl, &_tlsf -> sl_bitmap[_fl]); \
if (!_tlsf -> sl_bitmap [_fl]) \
clear_bit (_fl, &_tlsf -> fl_bitmap); \
} \
} \
_b -> ptr.free_ptr.prev = NULL; \
_b -> ptr.free_ptr.next = NULL; \
} while(0)
#define INSERT_BLOCK(_b, _tlsf, _fl, _sl) do { \
_b -> ptr.free_ptr.prev = NULL; \
_b -> ptr.free_ptr.next = _tlsf -> matrix [_fl][_sl]; \
if (_tlsf -> matrix [_fl][_sl]) \
_tlsf -> matrix [_fl][_sl] -> ptr.free_ptr.prev = _b; \
_tlsf -> matrix [_fl][_sl] = _b; \
set_bit (_sl, &_tlsf -> sl_bitmap [_fl]); \
set_bit (_fl, &_tlsf -> fl_bitmap); \
} while(0)
static __inline__ bhdr_t *process_area(void *area, size_t size)
{
bhdr_t *b, *lb, *ib;
area_info_t *ai;
ib = (bhdr_t *) area;
ib->size =
(sizeof(area_info_t) <
MIN_BLOCK_SIZE) ? MIN_BLOCK_SIZE : ROUNDUP_SIZE(sizeof(area_info_t)) | USED_BLOCK | PREV_USED;
b = (bhdr_t *) GET_NEXT_BLOCK(ib->ptr.buffer, ib->size & BLOCK_SIZE);
b->size = ROUNDDOWN_SIZE(size - 3 * BHDR_OVERHEAD - (ib->size & BLOCK_SIZE)) | USED_BLOCK | PREV_USED;
b->ptr.free_ptr.prev = b->ptr.free_ptr.next = 0;
lb = GET_NEXT_BLOCK(b->ptr.buffer, b->size & BLOCK_SIZE);
lb->prev_hdr = b;
lb->size = 0 | USED_BLOCK | PREV_FREE;
ai = (area_info_t *) ib->ptr.buffer;
ai->next = 0;
ai->end = lb;
return ib;
}
/* ****************************************************************************/
#ifndef PLATFORM_WINDOWS
#include <sys/mman.h>
#endif
PBD::TLSF::TLSF (std::string name, size_t mem_pool_size)
: _name (name)
{
mem_pool_size = ROUNDUP_SIZE (mem_pool_size);
char * mem_pool = (char*) ::malloc (mem_pool_size);
assert (mem_pool);
assert (mem_pool_size >= sizeof(tlsf_t) + BHDR_OVERHEAD * 8);
#ifndef __MINGW64__ // cast fails
assert (0 == (((unsigned long)mem_pool) & PTR_MASK));
#endif
#ifndef PLATFORM_WINDOWS
memset (mem_pool, 0, mem_pool_size); // make resident
mlock (mem_pool, mem_pool_size);
#endif
bhdr_t *b, *ib;
tlsf_t *tlsf = (tlsf_t *) mem_pool;
_mp = mem_pool;
/* Zeroing the memory pool */
memset(_mp, 0, sizeof(tlsf_t));
tlsf->tlsf_signature = TLSF_SIGNATURE;
ib = process_area(GET_NEXT_BLOCK
(_mp, ROUNDUP_SIZE(sizeof(tlsf_t))), ROUNDDOWN_SIZE(mem_pool_size - sizeof(tlsf_t)));
b = GET_NEXT_BLOCK(ib->ptr.buffer, ib->size & BLOCK_SIZE);
_free(b->ptr.buffer);
tlsf->area_head = (area_info_t *) ib->ptr.buffer;
#if TLSF_STATISTIC
tlsf->used_size = mem_pool_size - (b->size & BLOCK_SIZE);
tlsf->max_size = tlsf->used_size;
PRINT_MSG ("TLSF '%s': free %ld, reserved: %ld [bytes]\n",
_name.c_str(),
b->size & BLOCK_SIZE,
get_used_size());
#endif
}
PBD::TLSF::~TLSF ()
{
#if TLSF_STATISTIC
PRINT_MSG ("TLSF '%s': used: %ld, max: %ld [bytes]\n",
_name.c_str(),
get_used_size(),
get_max_size());
#endif
tlsf_t *tlsf = (tlsf_t *) _mp;
tlsf->tlsf_signature = 0;
::free (_mp);
_mp = NULL;
}
size_t
PBD::TLSF::get_used_size () const
{
#if TLSF_STATISTIC
return ((tlsf_t *) _mp)->used_size;
#else
return 0;
#endif
}
size_t
PBD::TLSF::get_max_size () const
{
#if TLSF_STATISTIC
return ((tlsf_t *) _mp)->max_size;
#else
return 0;
#endif
}
void *
PBD::TLSF::_malloc (size_t size)
{
tlsf_t *tlsf = (tlsf_t *) _mp;
bhdr_t *b, *b2, *next_b;
int fl, sl;
size_t tmp_size;
size = (size < MIN_BLOCK_SIZE) ? MIN_BLOCK_SIZE : ROUNDUP_SIZE(size);
/* Rounding up the requested size and calculating fl and sl */
MAPPING_SEARCH(&size, &fl, &sl);
/* Searching a free block, recall that this function changes the values of fl and sl,
so they are not longer valid when the function fails */
b = FIND_SUITABLE_BLOCK(tlsf, &fl, &sl);
if (!b)
return NULL; /* Not found */
EXTRACT_BLOCK_HDR(b, tlsf, fl, sl);
/*-- found: */
next_b = GET_NEXT_BLOCK(b->ptr.buffer, b->size & BLOCK_SIZE);
/* Should the block be split? */
tmp_size = (b->size & BLOCK_SIZE) - size;
if (tmp_size >= sizeof(bhdr_t)) {
tmp_size -= BHDR_OVERHEAD;
b2 = GET_NEXT_BLOCK(b->ptr.buffer, size);
b2->size = tmp_size | FREE_BLOCK | PREV_USED;
next_b->prev_hdr = b2;
MAPPING_INSERT(tmp_size, &fl, &sl);
INSERT_BLOCK(b2, tlsf, fl, sl);
b->size = size | (b->size & PREV_STATE);
} else {
next_b->size &= (~PREV_FREE);
b->size &= (~FREE_BLOCK); /* Now it's used */
}
TLSF_ADD_SIZE(tlsf, b);
return (void *) b->ptr.buffer;
}
void
PBD::TLSF::_free (void *ptr)
{
tlsf_t *tlsf = (tlsf_t *) _mp;
bhdr_t *b, *tmp_b;
int fl = 0, sl = 0;
if (!ptr) {
return;
}
b = (bhdr_t *) ((char *) ptr - BHDR_OVERHEAD);
b->size |= FREE_BLOCK;
TLSF_REMOVE_SIZE(tlsf, b);
b->ptr.free_ptr.prev = NULL;
b->ptr.free_ptr.next = NULL;
tmp_b = GET_NEXT_BLOCK(b->ptr.buffer, b->size & BLOCK_SIZE);
if (tmp_b->size & FREE_BLOCK) {
MAPPING_INSERT(tmp_b->size & BLOCK_SIZE, &fl, &sl);
EXTRACT_BLOCK(tmp_b, tlsf, fl, sl);
b->size += (tmp_b->size & BLOCK_SIZE) + BHDR_OVERHEAD;
}
if (b->size & PREV_FREE) {
tmp_b = b->prev_hdr;
MAPPING_INSERT(tmp_b->size & BLOCK_SIZE, &fl, &sl);
EXTRACT_BLOCK(tmp_b, tlsf, fl, sl);
tmp_b->size += (b->size & BLOCK_SIZE) + BHDR_OVERHEAD;
b = tmp_b;
}
MAPPING_INSERT(b->size & BLOCK_SIZE, &fl, &sl);
INSERT_BLOCK(b, tlsf, fl, sl);
tmp_b = GET_NEXT_BLOCK(b->ptr.buffer, b->size & BLOCK_SIZE);
tmp_b->size |= PREV_FREE;
tmp_b->prev_hdr = b;
}
void*
PBD::TLSF::_realloc(void *ptr, size_t new_size)
{
tlsf_t *tlsf = (tlsf_t *) _mp;
void *ptr_aux;
unsigned int cpsize;
bhdr_t *b, *tmp_b, *next_b;
int fl, sl;
size_t tmp_size;
if (!ptr) {
if (new_size)
return (void *) _malloc (new_size);
if (!new_size)
return NULL;
} else if (!new_size) {
_free(ptr);
return NULL;
}
b = (bhdr_t *) ((char *) ptr - BHDR_OVERHEAD);
next_b = GET_NEXT_BLOCK(b->ptr.buffer, b->size & BLOCK_SIZE);
new_size = (new_size < MIN_BLOCK_SIZE) ? MIN_BLOCK_SIZE : ROUNDUP_SIZE(new_size);
tmp_size = (b->size & BLOCK_SIZE);
if (new_size <= tmp_size) {
TLSF_REMOVE_SIZE(tlsf, b);
if (next_b->size & FREE_BLOCK) {
MAPPING_INSERT(next_b->size & BLOCK_SIZE, &fl, &sl);
EXTRACT_BLOCK(next_b, tlsf, fl, sl);
tmp_size += (next_b->size & BLOCK_SIZE) + BHDR_OVERHEAD;
next_b = GET_NEXT_BLOCK(next_b->ptr.buffer, next_b->size & BLOCK_SIZE);
/* We allways reenter this free block because tmp_size will
be greater then sizeof (bhdr_t) */
}
tmp_size -= new_size;
if (tmp_size >= sizeof(bhdr_t)) {
tmp_size -= BHDR_OVERHEAD;
tmp_b = GET_NEXT_BLOCK(b->ptr.buffer, new_size);
tmp_b->size = tmp_size | FREE_BLOCK | PREV_USED;
next_b->prev_hdr = tmp_b;
next_b->size |= PREV_FREE;
MAPPING_INSERT(tmp_size, &fl, &sl);
INSERT_BLOCK(tmp_b, tlsf, fl, sl);
b->size = new_size | (b->size & PREV_STATE);
}
TLSF_ADD_SIZE(tlsf, b);
return (void *) b->ptr.buffer;
}
if ((next_b->size & FREE_BLOCK)) {
if (new_size <= (tmp_size + (next_b->size & BLOCK_SIZE))) {
TLSF_REMOVE_SIZE(tlsf, b);
MAPPING_INSERT(next_b->size & BLOCK_SIZE, &fl, &sl);
EXTRACT_BLOCK(next_b, tlsf, fl, sl);
b->size += (next_b->size & BLOCK_SIZE) + BHDR_OVERHEAD;
next_b = GET_NEXT_BLOCK(b->ptr.buffer, b->size & BLOCK_SIZE);
next_b->prev_hdr = b;
next_b->size &= ~PREV_FREE;
tmp_size = (b->size & BLOCK_SIZE) - new_size;
if (tmp_size >= sizeof(bhdr_t)) {
tmp_size -= BHDR_OVERHEAD;
tmp_b = GET_NEXT_BLOCK(b->ptr.buffer, new_size);
tmp_b->size = tmp_size | FREE_BLOCK | PREV_USED;
next_b->prev_hdr = tmp_b;
next_b->size |= PREV_FREE;
MAPPING_INSERT(tmp_size, &fl, &sl);
INSERT_BLOCK(tmp_b, tlsf, fl, sl);
b->size = new_size | (b->size & PREV_STATE);
}
TLSF_ADD_SIZE(tlsf, b);
return (void *) b->ptr.buffer;
}
}
if (!(ptr_aux = _malloc (new_size))){
return NULL;
}
cpsize = ((b->size & BLOCK_SIZE) > new_size) ? new_size : (b->size & BLOCK_SIZE);
memcpy(ptr_aux, ptr, cpsize);
_free(ptr);
return ptr_aux;
}
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