Source to sys/gprof.h


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/*-
 * Copyright (c) 1982, 1986 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)gprof.h	7.2 (Berkeley) 2/15/91
 */

struct phdr {
    char	*lpc;
    char	*hpc;
    int		ncnt;
};

    /*
     *	histogram counters are unsigned shorts (according to the kernel).
     */
#define	HISTCOUNTER	unsigned short

    /*
     *	fraction of text space to allocate for histogram counters
     *	here, 1/2
     */
#define	HISTFRACTION	2

    /*
     *	Fraction of text space to allocate for from hash buckets.
     *	The value of HASHFRACTION is based on the minimum number of bytes
     *	of separation between two subroutine call points in the object code.
     *	Given MIN_SUBR_SEPARATION bytes of separation the value of
     *	HASHFRACTION is calculated as:
     *
     *		HASHFRACTION = MIN_SUBR_SEPARATION / (2 * sizeof(short) - 1);
     *
     *	For the VAX, the shortest two call sequence is:
     *
     *		calls	$0,(r0)
     *		calls	$0,(r0)
     *
     *	which is separated by only three bytes, thus HASHFRACTION is 
     *	calculated as:
     *
     *		HASHFRACTION = 3 / (2 * 2 - 1) = 1
     *
     *	Note that the division above rounds down, thus if MIN_SUBR_FRACTION
     *	is less than three, this algorithm will not work!
     *
     *	NB: for the kernel we assert that the shortest two call sequence is:
     *
     *		calls	$0,_name
     *		calls	$0,_name
     *
     *	which is separated by seven bytes, thus HASHFRACTION is calculated as:
     *
     *		HASHFRACTION = 7 / (2 * 2 - 1) = 2
     */
#define	HASHFRACTION	2

    /*
     *	percent of text space to allocate for tostructs
     *	with a minimum.
     */
#define ARCDENSITY	2
#define MINARCS		50

struct tostruct {
    char		*selfpc;
    long		count;
    unsigned short	link;
};

    /*
     *	a raw arc,
     *	    with pointers to the calling site and the called site
     *	    and a count.
     */
struct rawarc {
    unsigned long	raw_frompc;
    unsigned long	raw_selfpc;
    long		raw_count;
};

    /*
     *	general rounding functions.
     */
#define ROUNDDOWN(x,y)	(((x)/(y))*(y))
#define ROUNDUP(x,y)	((((x)+(y)-1)/(y))*(y))