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gmon.c
/*-
 * Copyright (c) 1983, 1992, 1993
 *    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.
 * 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.
 */

#if !defined(lint) && defined(LIBC_SCCS)
static char rcsid[] = "$OpenBSD: gmon.c,v 1.8 1997/07/23 21:11:27 kstailey Exp $";
#endif

/*
 * This file is taken from Cygwin distribution. Please keep it in sync.
 * The differences should be within __MINGW32__ guard.
 */

#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#ifndef __MINGW32__
#include <unistd.h>
#include <sys/param.h>
#endif
#include <sys/types.h>
#include "gmon.h"
#include "profil.h"

/* XXX needed? */
//extern char *minbrk __asm ("minbrk");

#ifdef _WIN64
#define MINUS_ONE_P (-1LL)
#else
#define MINUS_ONE_P (-1)
#endif

#ifdef __MINGW32__
#include <string.h>
#define bzero(ptr,size) memset (ptr, 0, size);
#endif

struct gmonparam _gmonparam = { GMON_PROF_OFF, NULL, 0, NULL, 0, NULL, 0, 0L,
  0, 0, 0, 0};

static int  s_scale;
/* see profil(2) where this is describe (incorrectly) */
#define           SCALE_1_TO_1      0x10000L

#define ERR(s) write(2, s, sizeof(s))

void  moncontrol __P((int));

static void *
fake_sbrk(int size)
{
    void *rv = malloc(size);
    if (rv)
      return rv;
    else
      return (void *) MINUS_ONE_P;
}

void monstartup (size_t, size_t);

void
monstartup (size_t lowpc, size_t highpc)
{
      register size_t o;
      char *cp;
      struct gmonparam *p = &_gmonparam;

      /*
       * round lowpc and highpc to multiples of the density we're using
       * so the rest of the scaling (here and in gprof) stays in ints.
       */
      p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER));
      p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER));
      p->textsize = p->highpc - p->lowpc;
      p->kcountsize = p->textsize / HISTFRACTION;
      p->hashfraction = HASHFRACTION;
      p->fromssize = p->textsize / p->hashfraction;
      p->tolimit = p->textsize * ARCDENSITY / 100;
      if (p->tolimit < MINARCS)
            p->tolimit = MINARCS;
      else if (p->tolimit > MAXARCS)
            p->tolimit = MAXARCS;
      p->tossize = p->tolimit * sizeof(struct tostruct);

      cp = fake_sbrk(p->kcountsize + p->fromssize + p->tossize);
      if (cp == (char *)MINUS_ONE_P) {
            ERR("monstartup: out of memory\n");
            return;
      }

      /* zero out cp as value will be added there */
      bzero(cp, p->kcountsize + p->fromssize + p->tossize);

      p->tos = (struct tostruct *)cp;
      cp += p->tossize;
      p->kcount = (u_short *)cp;
      cp += p->kcountsize;
      p->froms = (u_short *)cp;

      /* XXX minbrk needed? */
      //minbrk = fake_sbrk(0);
      p->tos[0].link = 0;

      o = p->highpc - p->lowpc;
      if (p->kcountsize < o) {
#ifndef notdef
            s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1;
#else /* avoid floating point */
            int quot = o / p->kcountsize;

            if (quot >= 0x10000)
                  s_scale = 1;
            else if (quot >= 0x100)
                  s_scale = 0x10000 / quot;
            else if (o >= 0x800000)
                  s_scale = 0x1000000 / (o / (p->kcountsize >> 8));
            else
                  s_scale = 0x1000000 / ((o << 8) / p->kcountsize);
#endif
      } else
            s_scale = SCALE_1_TO_1;

      moncontrol(1);
}

void _mcleanup (void);
void
_mcleanup(void)
{
      static char gmon_out[] = "gmon.out";
      int fd;
      int hz;
      int fromindex;
      int endfrom;
      size_t frompc;
      int toindex;
      struct rawarc rawarc;
      struct gmonparam *p = &_gmonparam;
      struct gmonhdr gmonhdr, *hdr;
      const char *proffile;
#ifdef DEBUG
      int log, len;
      char dbuf[200];
#endif

      if (p->state == GMON_PROF_ERROR)
            ERR("_mcleanup: tos overflow\n");

      hz = PROF_HZ;
      moncontrol(0);

#ifdef nope
      if ((profdir = getenv("PROFDIR")) != NULL) {
            extern char *__progname;
            char *s, *t, *limit;
            pid_t pid;
            long divisor;

            /* If PROFDIR contains a null value, no profiling
               output is produced */
            if (*profdir == '\0') {
                  return;
            }

            limit = buf + sizeof buf - 1 - 10 - 1 -
                strlen(__progname) - 1;
            t = buf;
            s = profdir;
            while((*t = *s) != '\0' && t < limit) {
                  t++;
                  s++;
            }
            *t++ = '/';

            /*
             * Copy and convert pid from a pid_t to a string.  For
             * best performance, divisor should be initialized to
             * the largest power of 10 less than PID_MAX.
             */
            pid = getpid();
            divisor=10000;
            while (divisor > pid) divisor /= 10;      /* skip leading zeros */
            do {
                  *t++ = (pid/divisor) + '0';
                  pid %= divisor;
            } while (divisor /= 10);
            *t++ = '.';

            s = __progname;
            while ((*t++ = *s++) != '\0')
                  ;

            proffile = buf;
      } else {
            proffile = gmon_out;
      }
#else
      proffile = gmon_out;
#endif

      fd = open(proffile , O_CREAT|O_TRUNC|O_WRONLY|O_BINARY, 0666);
      if (fd < 0) {
            perror( proffile );
            return;
      }
#ifdef DEBUG
      log = open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664);
      if (log < 0) {
            perror("mcount: gmon.log");
            return;
      }
      len = sprintf(dbuf, "[mcleanup1] kcount 0x%x ssiz %d\n",
          p->kcount, p->kcountsize);
      write(log, dbuf, len);
#endif
      hdr = (struct gmonhdr *)&gmonhdr;
      hdr->lpc = p->lowpc;
      hdr->hpc = p->highpc;
      hdr->ncnt = p->kcountsize + sizeof(gmonhdr);
      hdr->version = GMONVERSION;
      hdr->profrate = hz;
      write(fd, (char *)hdr, sizeof *hdr);
      write(fd, p->kcount, p->kcountsize);
      endfrom = p->fromssize / sizeof(*p->froms);
      for (fromindex = 0; fromindex < endfrom; fromindex++) {
            if (p->froms[fromindex] == 0)
                  continue;

            frompc = p->lowpc;
            frompc += fromindex * p->hashfraction * sizeof(*p->froms);
            for (toindex = p->froms[fromindex]; toindex != 0;
                 toindex = p->tos[toindex].link) {
#ifdef DEBUG
                  len = sprintf(dbuf,
                  "[mcleanup2] frompc 0x%x selfpc 0x%x count %d\n" ,
                        frompc, p->tos[toindex].selfpc,
                        p->tos[toindex].count);
                  write(log, dbuf, len);
#endif
                  rawarc.raw_frompc = frompc;
                  rawarc.raw_selfpc = p->tos[toindex].selfpc;
                  rawarc.raw_count = p->tos[toindex].count;
                  write(fd, &rawarc, sizeof rawarc);
            }
      }
      close(fd);
}

/*
 * Control profiling
 *    profiling is what mcount checks to see if
 *    all the data structures are ready.
 */
void
moncontrol(int mode)
{
      struct gmonparam *p = &_gmonparam;

      if (mode) {
            /* start */
            profil((char *)p->kcount, p->kcountsize, p->lowpc,
                s_scale);
            p->state = GMON_PROF_ON;
      } else {
            /* stop */
            profil((char *)0, 0, 0, 0);
            p->state = GMON_PROF_OFF;
      }
}



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