gprof/gmon.h

   1 /*-
   2  * Copyright (c) 1991 The Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)gmon.h      5.2 (Berkeley) 5/6/91
  34  */
  35 #ifndef gmon_h
  36 #define gmon_h
  37
  38 struct raw_phdr {
  39     char low_pc[sizeof(bfd_vma)];       /* base pc address of sample buffer */
  40     char high_pc[sizeof(bfd_vma)];      /* max pc address of sampled buffer */
  41     char ncnt[4];               /* size of sample buffer (plus this header) */
  42 #ifdef __osf__
  43     /*
  44      * DEC's OSF v3.0 uses 4 bytes of padding to bring the header to
  45      * a size that is a multiple of 8.
  46      */
  47     char pad[4];
  48 #endif
  49 };
  50
  51 /*
  52  * Histogram counters are unsigned shorts:
  53  */
  54 #define HISTCOUNTER unsigned short
  55
  56 /*
  57  * Fraction of text space to allocate for histogram counters here, 1/2:
  58  */
  59 #define HISTFRACTION    2
  60
  61 /*
  62  * Fraction of text space to allocate for from hash buckets.  The
  63  * value of HASHFRACTION is based on the minimum number of bytes of
  64  * separation between two subroutine call points in the object code.
  65  * Given MIN_SUBR_SEPARATION bytes of separation the value of
  66  * HASHFRACTION is calculated as:
  67  *
  68  *      HASHFRACTION = MIN_SUBR_SEPARATION / (2 * sizeof(short) - 1);
  69  *
  70  * For the VAX, the shortest two call sequence is:
  71  *
  72  *      calls   $0,(r0)
  73  *      calls   $0,(r0)
  74  *
  75  * which is separated by only three bytes, thus HASHFRACTION is
  76  * calculated as:
  77  *
  78  *      HASHFRACTION = 3 / (2 * 2 - 1) = 1
  79  *
  80  * Note that the division above rounds down, thus if MIN_SUBR_FRACTION
  81  * is less than three, this algorithm will not work!
  82  */
  83 #define HASHFRACTION 1
  84
  85 /*
  86  * Percent of text space to allocate for tostructs with a minimum:
  87  */
  88 #define ARCDENSITY      2
  89 #define MINARCS         50
  90
  91 struct tostruct {
  92     char                *selfpc;
  93     int                 count;
  94     unsigned short      link;
  95 };
  96
  97 /*
  98  * A raw arc, with pointers to the calling site and the called site
  99  * and a count.  Everything is defined in terms of characters so
 100  * as to get a packed representation (otherwise, different compilers
 101  * might introduce different padding):
 102  */
 103 struct raw_arc {
 104     char from_pc[sizeof(bfd_vma)];
 105     char self_pc[sizeof(bfd_vma)];
 106     char count[sizeof(long)];
 107 };
 108
 109 /*
 110  * General rounding functions:
 111  */
 112 #define ROUNDDOWN(x,y)  (((x)/(y))*(y))
 113 #define ROUNDUP(x,y)    ((((x)+(y)-1)/(y))*(y))
 114
 115 #endif /* gmon_h */