newlib-cygwin/winsup/cygwin/gmon.c

283 lines
7.5 KiB
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
#include <string.h>
#define bzero(ptr,size) memset (ptr, 0, size);
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_int16_t *)cp;
cp += p->kcountsize;
p->froms = (u_int16_t *)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)
{
int fd;
int hz;
int fromindex;
int endfrom;
size_t frompc;
int toindex;
struct rawarc rawarc;
struct gmonparam *p = &_gmonparam;
struct gmonhdr gmonhdr, *hdr;
char *filename = (char *) "gmon.out";
char *prefix;
#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);
/* We copy an undocumented glibc feature: customizing the profiler's
output file name somewhat, depending on the env var GMON_OUT_PREFIX.
if GMON_OUT_PREFIX is unspecified, the file's name is "gmon.out".
if GMON_OUT_PREFIX is specified with at least one character, the
file's name is computed as "$GMON_OUT_PREFIX.$pid".
if GMON_OUT_PREFIX is specified but contains no characters, the
file's name is computed as "gmon.out.$pid". Cygwin-specific.
*/
if ((prefix = getenv("GMON_OUT_PREFIX")) != NULL) {
char *buf;
/* Covers positive pid_t values. */
int32_t divisor = 1000*1000*1000;
pid_t pid = getpid();
size_t len = strlen(prefix);
if (len == 0)
len = strlen(prefix = filename);
buf = alloca(len + 13);// allow for '.', 10-digit pid, NUL, +1
memcpy(buf, prefix, len);
buf[len++] = '.';
while (divisor > pid) // skip leading zeroes
divisor /= 10;
do { // convert pid to digits and store 'em
buf[len++] = (pid / divisor) + '0';
pid %= divisor;
} while (divisor /= 10);
buf[len] = '\0';
filename = buf;
}
fd = open(filename, O_CREAT|O_TRUNC|O_WRONLY|O_BINARY, 0666);
if (fd < 0) {
perror(filename);
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;
bzero(hdr, sizeof *hdr);
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;
}
}