283 lines
7.5 KiB
C
283 lines
7.5 KiB
C
/*-
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* Copyright (c) 1983, 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if !defined(lint) && defined(LIBC_SCCS)
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static char rcsid[] = "$OpenBSD: gmon.c,v 1.8 1997/07/23 21:11:27 kstailey Exp $";
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#endif
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/*
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* This file is taken from Cygwin distribution. Please keep it in sync.
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* The differences should be within __MINGW32__ guard.
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*/
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#ifndef __MINGW32__
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#include <unistd.h>
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#include <sys/param.h>
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#endif
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#include <sys/types.h>
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#include "gmon.h"
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#include "profil.h"
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/* XXX needed? */
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//extern char *minbrk __asm ("minbrk");
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#ifdef _WIN64
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#define MINUS_ONE_P (-1LL)
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#else
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#define MINUS_ONE_P (-1)
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#endif
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#include <string.h>
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#define bzero(ptr,size) memset (ptr, 0, size);
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struct gmonparam _gmonparam = { GMON_PROF_OFF, NULL, 0, NULL, 0, NULL, 0, 0L,
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0, 0, 0, 0};
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static int s_scale;
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/* see profil(2) where this is describe (incorrectly) */
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#define SCALE_1_TO_1 0x10000L
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#define ERR(s) write(2, s, sizeof(s))
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void moncontrol __P((int));
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static void *
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fake_sbrk(int size)
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{
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void *rv = malloc(size);
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if (rv)
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return rv;
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else
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return (void *) MINUS_ONE_P;
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}
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void monstartup (size_t, size_t);
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void
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monstartup (size_t lowpc, size_t highpc)
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{
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register size_t o;
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char *cp;
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struct gmonparam *p = &_gmonparam;
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/*
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* round lowpc and highpc to multiples of the density we're using
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* so the rest of the scaling (here and in gprof) stays in ints.
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*/
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p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER));
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p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER));
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p->textsize = p->highpc - p->lowpc;
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p->kcountsize = p->textsize / HISTFRACTION;
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p->hashfraction = HASHFRACTION;
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p->fromssize = p->textsize / p->hashfraction;
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p->tolimit = p->textsize * ARCDENSITY / 100;
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if (p->tolimit < MINARCS)
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p->tolimit = MINARCS;
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else if (p->tolimit > MAXARCS)
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p->tolimit = MAXARCS;
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p->tossize = p->tolimit * sizeof(struct tostruct);
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cp = fake_sbrk(p->kcountsize + p->fromssize + p->tossize);
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if (cp == (char *)MINUS_ONE_P) {
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ERR("monstartup: out of memory\n");
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return;
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}
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/* zero out cp as value will be added there */
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bzero(cp, p->kcountsize + p->fromssize + p->tossize);
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p->tos = (struct tostruct *)cp;
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cp += p->tossize;
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p->kcount = (u_int16_t *)cp;
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cp += p->kcountsize;
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p->froms = (u_int16_t *)cp;
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/* XXX minbrk needed? */
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//minbrk = fake_sbrk(0);
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p->tos[0].link = 0;
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o = p->highpc - p->lowpc;
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if (p->kcountsize < o) {
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#ifndef notdef
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s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1;
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#else /* avoid floating point */
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int quot = o / p->kcountsize;
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if (quot >= 0x10000)
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s_scale = 1;
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else if (quot >= 0x100)
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s_scale = 0x10000 / quot;
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else if (o >= 0x800000)
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s_scale = 0x1000000 / (o / (p->kcountsize >> 8));
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else
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s_scale = 0x1000000 / ((o << 8) / p->kcountsize);
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#endif
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} else
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s_scale = SCALE_1_TO_1;
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moncontrol(1);
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}
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void _mcleanup (void);
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void
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_mcleanup(void)
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{
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int fd;
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int hz;
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int fromindex;
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int endfrom;
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size_t frompc;
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int toindex;
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struct rawarc rawarc;
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struct gmonparam *p = &_gmonparam;
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struct gmonhdr gmonhdr, *hdr;
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char *filename = (char *) "gmon.out";
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char *prefix;
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#ifdef DEBUG
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int log, len;
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char dbuf[200];
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#endif
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if (p->state == GMON_PROF_ERROR)
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ERR("_mcleanup: tos overflow\n");
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hz = PROF_HZ;
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moncontrol(0);
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/* We copy an undocumented glibc feature: customizing the profiler's
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output file name somewhat, depending on the env var GMON_OUT_PREFIX.
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if GMON_OUT_PREFIX is unspecified, the file's name is "gmon.out".
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if GMON_OUT_PREFIX is specified with at least one character, the
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file's name is computed as "$GMON_OUT_PREFIX.$pid".
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if GMON_OUT_PREFIX is specified but contains no characters, the
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file's name is computed as "gmon.out.$pid". Cygwin-specific.
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*/
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if ((prefix = getenv("GMON_OUT_PREFIX")) != NULL) {
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char *buf;
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/* Covers positive pid_t values. */
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int32_t divisor = 1000*1000*1000;
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pid_t pid = getpid();
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size_t len = strlen(prefix);
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if (len == 0)
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len = strlen(prefix = filename);
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buf = alloca(len + 13);// allow for '.', 10-digit pid, NUL, +1
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memcpy(buf, prefix, len);
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buf[len++] = '.';
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while (divisor > pid) // skip leading zeroes
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divisor /= 10;
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do { // convert pid to digits and store 'em
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buf[len++] = (pid / divisor) + '0';
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pid %= divisor;
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} while (divisor /= 10);
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buf[len] = '\0';
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filename = buf;
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}
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fd = open(filename, O_CREAT|O_TRUNC|O_WRONLY|O_BINARY, 0666);
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if (fd < 0) {
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perror(filename);
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return;
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}
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#ifdef DEBUG
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log = open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664);
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if (log < 0) {
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perror("mcount: gmon.log");
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return;
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}
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len = sprintf(dbuf, "[mcleanup1] kcount 0x%x ssiz %d\n",
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p->kcount, p->kcountsize);
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write(log, dbuf, len);
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#endif
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hdr = (struct gmonhdr *)&gmonhdr;
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bzero(hdr, sizeof *hdr);
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hdr->lpc = p->lowpc;
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hdr->hpc = p->highpc;
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hdr->ncnt = p->kcountsize + sizeof(gmonhdr);
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hdr->version = GMONVERSION;
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hdr->profrate = hz;
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write(fd, (char *)hdr, sizeof *hdr);
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write(fd, p->kcount, p->kcountsize);
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endfrom = p->fromssize / sizeof(*p->froms);
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for (fromindex = 0; fromindex < endfrom; fromindex++) {
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if (p->froms[fromindex] == 0)
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continue;
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frompc = p->lowpc;
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frompc += fromindex * p->hashfraction * sizeof(*p->froms);
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for (toindex = p->froms[fromindex]; toindex != 0;
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toindex = p->tos[toindex].link) {
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#ifdef DEBUG
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len = sprintf(dbuf,
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"[mcleanup2] frompc 0x%x selfpc 0x%x count %d\n" ,
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frompc, p->tos[toindex].selfpc,
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p->tos[toindex].count);
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write(log, dbuf, len);
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#endif
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rawarc.raw_frompc = frompc;
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rawarc.raw_selfpc = p->tos[toindex].selfpc;
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rawarc.raw_count = p->tos[toindex].count;
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write(fd, &rawarc, sizeof rawarc);
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}
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}
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close(fd);
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}
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/*
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* Control profiling
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* profiling is what mcount checks to see if
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* all the data structures are ready.
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*/
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void
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moncontrol(int mode)
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{
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struct gmonparam *p = &_gmonparam;
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if (mode) {
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/* start */
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profil((char *)p->kcount, p->kcountsize, p->lowpc,
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s_scale);
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p->state = GMON_PROF_ON;
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} else {
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/* stop */
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profil((char *)0, 0, 0, 0);
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p->state = GMON_PROF_OFF;
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}
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}
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