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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.2 */
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <memory.h>
#include <thread.h>
#include <pthread.h>
#include <synch.h>
#include <procfs.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
/* debugging macros */
#ifdef DEBUG
#define ASSERT(p) ((void) ((p) || (abort(), 0)))
#define COUNT(n) ((void) n++)
static int nmalloc, nrealloc, nfree;
#else
#define ASSERT(p) ((void)0)
#define COUNT(n) ((void)0)
#endif /* DEBUG */
/* for conveniences */
#ifndef NULL
#define NULL (0)
#endif
#define WORDSIZE (sizeof (WORD))
#define MINSIZE (sizeof (TREE) - sizeof (WORD))
#define ROUND(s) if ((s)%WORDSIZE) (s) += (WORDSIZE - ((s)%WORDSIZE))
/*
* All of our allocations will be aligned on the least multiple of 4,
* at least, so the two low order bits are guaranteed to be available.
*/
#ifdef _LP64
#define ALIGN 16
#else
#define ALIGN 8
#endif
/* the proto-word; size must be ALIGN bytes */
typedef union _w_ {
size_t w_i; /* an unsigned int */
struct _t_ *w_p[2]; /* two pointers */
} WORD;
/* structure of a node in the free tree */
typedef struct _t_ {
WORD t_s; /* size of this element */
WORD t_p; /* parent node */
WORD t_l; /* left child */
WORD t_r; /* right child */
WORD t_n; /* next in link list */
WORD t_d; /* dummy to reserve space for self-pointer */
} TREE;
/* usable # of bytes in the block */
#define SIZE(b) (((b)->t_s).w_i)
#define RSIZE(b) (((b)->t_s).w_i & ~BITS01)
/* free tree pointers */
#define PARENT(b) (((b)->t_p).w_p[0])
#define LEFT(b) (((b)->t_l).w_p[0])
#define RIGHT(b) (((b)->t_r).w_p[0])
/* forward link in lists of small blocks */
#define AFTER(b) (((b)->t_p).w_p[0])
/* forward and backward links for lists in the tree */
#define LINKFOR(b) (((b)->t_n).w_p[0])
#define LINKBAK(b) (((b)->t_p).w_p[0])
/* set/test indicator if a block is in the tree or in a list */
#define SETNOTREE(b) (LEFT(b) = (TREE *)(-1))
#define ISNOTREE(b) (LEFT(b) == (TREE *)(-1))
/* functions to get information on a block */
#define DATA(b) (((char *)(b)) + WORDSIZE)
#define BLOCK(d) ((TREE *)(((char *)(d)) - WORDSIZE))
#define SELFP(b) (&(NEXT(b)->t_s.w_p[1]))
#define LAST(b) ((b)->t_s.w_p[1])
#define NEXT(b) ((TREE *)(((char *)(b)) + RSIZE(b) + WORDSIZE))
#define BOTTOM(b) ((DATA(b) + RSIZE(b) + WORDSIZE) == Baddr)
/* functions to set and test the lowest two bits of a word */
#define BIT0 (01) /* ...001 */
#define BIT1 (02) /* ...010 */
#define BITS01 (03) /* ...011 */
#define ISBIT0(w) ((w) & BIT0) /* Is busy? */
#define ISBIT1(w) ((w) & BIT1) /* Is the preceding free? */
#define SETBIT0(w) ((w) |= BIT0) /* Block is busy */
#define SETBIT1(w) ((w) |= BIT1) /* The preceding is free */
#define CLRBIT0(w) ((w) &= ~BIT0) /* Clean bit0 */
#define CLRBIT1(w) ((w) &= ~BIT1) /* Clean bit1 */
#define SETBITS01(w) ((w) |= BITS01) /* Set bits 0 & 1 */
#define CLRBITS01(w) ((w) &= ~BITS01) /* Clean bits 0 & 1 */
#define SETOLD01(n, o) ((n) |= (BITS01 & (o)))
/* system call to get more memory */
#define GETCORE sbrk
#define ERRCORE ((char *)(-1))
#define CORESIZE (1024*ALIGN)
#define MAX_GETCORE (size_t)(SSIZE_MAX & ~(ALIGN - 1)) /* round down ALIGN */
#define MAX_MALLOC (size_t)(SIZE_MAX - CORESIZE - 3 * ALIGN) /* overflow chk */
#define MAX_ALIGN (1 + (size_t)SSIZE_MAX)
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