mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-24 02:03:35 +08:00
408 lines
11 KiB
C
408 lines
11 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.
|
|
*/
|
|
#include <sys/param.h>
|
|
#include <sys/time.h>
|
|
#include <sys/gmon.h>
|
|
#include <sys/gmon_out.h>
|
|
#include <sys/uio.h>
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <libc-internal.h>
|
|
#include <not-cancel.h>
|
|
|
|
#ifdef USE_IN_LIBIO
|
|
# include <wchar.h>
|
|
#endif
|
|
|
|
/* Head of basic-block list or NULL. */
|
|
struct __bb *__bb_head attribute_hidden;
|
|
|
|
struct gmonparam _gmonparam attribute_hidden = { GMON_PROF_OFF };
|
|
|
|
/*
|
|
* See profil(2) where this is described:
|
|
*/
|
|
static int s_scale;
|
|
#define SCALE_1_TO_1 0x10000L
|
|
|
|
#define ERR(s) write_not_cancel (STDERR_FILENO, s, sizeof (s) - 1)
|
|
|
|
void moncontrol (int mode);
|
|
void __moncontrol (int mode);
|
|
static void write_hist (int fd) internal_function;
|
|
static void write_call_graph (int fd) internal_function;
|
|
static void write_bb_counts (int fd) internal_function;
|
|
|
|
/*
|
|
* Control profiling
|
|
* profiling is what mcount checks to see if
|
|
* all the data structures are ready.
|
|
*/
|
|
void
|
|
__moncontrol (mode)
|
|
int mode;
|
|
{
|
|
struct gmonparam *p = &_gmonparam;
|
|
|
|
/* Don't change the state if we ran into an error. */
|
|
if (p->state == GMON_PROF_ERROR)
|
|
return;
|
|
|
|
if (mode)
|
|
{
|
|
/* start */
|
|
__profil((void *) p->kcount, p->kcountsize, p->lowpc, s_scale);
|
|
p->state = GMON_PROF_ON;
|
|
}
|
|
else
|
|
{
|
|
/* stop */
|
|
__profil(NULL, 0, 0, 0);
|
|
p->state = GMON_PROF_OFF;
|
|
}
|
|
}
|
|
weak_alias (__moncontrol, moncontrol)
|
|
|
|
|
|
void
|
|
__monstartup (lowpc, highpc)
|
|
u_long lowpc;
|
|
u_long highpc;
|
|
{
|
|
register int 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 = ROUNDUP(p->textsize / HISTFRACTION, sizeof(*p->froms));
|
|
p->hashfraction = HASHFRACTION;
|
|
p->log_hashfraction = -1;
|
|
/* The following test must be kept in sync with the corresponding
|
|
test in mcount.c. */
|
|
if ((HASHFRACTION & (HASHFRACTION - 1)) == 0) {
|
|
/* if HASHFRACTION is a power of two, mcount can use shifting
|
|
instead of integer division. Precompute shift amount. */
|
|
p->log_hashfraction = ffs(p->hashfraction * sizeof(*p->froms)) - 1;
|
|
}
|
|
p->fromssize = p->textsize / 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 = calloc (p->kcountsize + p->fromssize + p->tossize, 1);
|
|
if (! cp)
|
|
{
|
|
ERR("monstartup: out of memory\n");
|
|
p->tos = NULL;
|
|
p->state = GMON_PROF_ERROR;
|
|
return;
|
|
}
|
|
p->tos = (struct tostruct *)cp;
|
|
cp += p->tossize;
|
|
p->kcount = (HISTCOUNTER *)cp;
|
|
cp += p->kcountsize;
|
|
p->froms = (ARCINDEX *)cp;
|
|
|
|
p->tos[0].link = 0;
|
|
|
|
o = p->highpc - p->lowpc;
|
|
if (p->kcountsize < (u_long) o)
|
|
{
|
|
#ifndef hp300
|
|
s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1;
|
|
#else
|
|
/* avoid floating point operations */
|
|
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);
|
|
}
|
|
weak_alias(__monstartup, monstartup)
|
|
|
|
|
|
static void
|
|
internal_function
|
|
write_hist (fd)
|
|
int fd;
|
|
{
|
|
u_char tag = GMON_TAG_TIME_HIST;
|
|
struct gmon_hist_hdr thdr __attribute__ ((aligned (__alignof__ (char *))));
|
|
|
|
if (_gmonparam.kcountsize > 0)
|
|
{
|
|
struct iovec iov[3] =
|
|
{
|
|
{ &tag, sizeof (tag) },
|
|
{ &thdr, sizeof (struct gmon_hist_hdr) },
|
|
{ _gmonparam.kcount, _gmonparam.kcountsize }
|
|
};
|
|
|
|
*(char **) thdr.low_pc = (char *) _gmonparam.lowpc;
|
|
*(char **) thdr.high_pc = (char *) _gmonparam.highpc;
|
|
*(int32_t *) thdr.hist_size = (_gmonparam.kcountsize
|
|
/ sizeof (HISTCOUNTER));
|
|
*(int32_t *) thdr.prof_rate = __profile_frequency ();
|
|
strncpy (thdr.dimen, "seconds", sizeof (thdr.dimen));
|
|
thdr.dimen_abbrev = 's';
|
|
|
|
writev_not_cancel_no_status (fd, iov, 3);
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
internal_function
|
|
write_call_graph (fd)
|
|
int fd;
|
|
{
|
|
#define NARCS_PER_WRITEV 32
|
|
u_char tag = GMON_TAG_CG_ARC;
|
|
struct gmon_cg_arc_record raw_arc[NARCS_PER_WRITEV]
|
|
__attribute__ ((aligned (__alignof__ (char*))));
|
|
ARCINDEX from_index, to_index;
|
|
u_long from_len;
|
|
u_long frompc;
|
|
struct iovec iov[2 * NARCS_PER_WRITEV];
|
|
int nfilled;
|
|
|
|
for (nfilled = 0; nfilled < NARCS_PER_WRITEV; ++nfilled)
|
|
{
|
|
iov[2 * nfilled].iov_base = &tag;
|
|
iov[2 * nfilled].iov_len = sizeof (tag);
|
|
|
|
iov[2 * nfilled + 1].iov_base = &raw_arc[nfilled];
|
|
iov[2 * nfilled + 1].iov_len = sizeof (struct gmon_cg_arc_record);
|
|
}
|
|
|
|
nfilled = 0;
|
|
from_len = _gmonparam.fromssize / sizeof (*_gmonparam.froms);
|
|
for (from_index = 0; from_index < from_len; ++from_index)
|
|
{
|
|
if (_gmonparam.froms[from_index] == 0)
|
|
continue;
|
|
|
|
frompc = _gmonparam.lowpc;
|
|
frompc += (from_index * _gmonparam.hashfraction
|
|
* sizeof (*_gmonparam.froms));
|
|
for (to_index = _gmonparam.froms[from_index];
|
|
to_index != 0;
|
|
to_index = _gmonparam.tos[to_index].link)
|
|
{
|
|
struct arc
|
|
{
|
|
char *frompc;
|
|
char *selfpc;
|
|
int32_t count;
|
|
}
|
|
arc;
|
|
|
|
arc.frompc = (char *) frompc;
|
|
arc.selfpc = (char *) _gmonparam.tos[to_index].selfpc;
|
|
arc.count = _gmonparam.tos[to_index].count;
|
|
memcpy (raw_arc + nfilled, &arc, sizeof (raw_arc [0]));
|
|
|
|
if (++nfilled == NARCS_PER_WRITEV)
|
|
{
|
|
writev_not_cancel_no_status (fd, iov, 2 * nfilled);
|
|
nfilled = 0;
|
|
}
|
|
}
|
|
}
|
|
if (nfilled > 0)
|
|
writev_not_cancel_no_status (fd, iov, 2 * nfilled);
|
|
}
|
|
|
|
|
|
static void
|
|
internal_function
|
|
write_bb_counts (fd)
|
|
int fd;
|
|
{
|
|
struct __bb *grp;
|
|
u_char tag = GMON_TAG_BB_COUNT;
|
|
size_t ncounts;
|
|
size_t i;
|
|
|
|
struct iovec bbhead[2] =
|
|
{
|
|
{ &tag, sizeof (tag) },
|
|
{ &ncounts, sizeof (ncounts) }
|
|
};
|
|
struct iovec bbbody[8];
|
|
size_t nfilled;
|
|
|
|
for (i = 0; i < (sizeof (bbbody) / sizeof (bbbody[0])); i += 2)
|
|
{
|
|
bbbody[i].iov_len = sizeof (grp->addresses[0]);
|
|
bbbody[i + 1].iov_len = sizeof (grp->counts[0]);
|
|
}
|
|
|
|
/* Write each group of basic-block info (all basic-blocks in a
|
|
compilation unit form a single group). */
|
|
|
|
for (grp = __bb_head; grp; grp = grp->next)
|
|
{
|
|
ncounts = grp->ncounts;
|
|
writev_not_cancel_no_status (fd, bbhead, 2);
|
|
for (nfilled = i = 0; i < ncounts; ++i)
|
|
{
|
|
if (nfilled > (sizeof (bbbody) / sizeof (bbbody[0])) - 2)
|
|
{
|
|
writev_not_cancel_no_status (fd, bbbody, nfilled);
|
|
nfilled = 0;
|
|
}
|
|
|
|
bbbody[nfilled++].iov_base = (char *) &grp->addresses[i];
|
|
bbbody[nfilled++].iov_base = &grp->counts[i];
|
|
}
|
|
if (nfilled > 0)
|
|
writev_not_cancel_no_status (fd, bbbody, nfilled);
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
write_gmon (void)
|
|
{
|
|
struct gmon_hdr ghdr __attribute__ ((aligned (__alignof__ (int))));
|
|
int fd = -1;
|
|
char *env;
|
|
|
|
#ifndef O_NOFOLLOW
|
|
# define O_NOFOLLOW 0
|
|
#endif
|
|
|
|
env = getenv ("GMON_OUT_PREFIX");
|
|
if (env != NULL && !__libc_enable_secure)
|
|
{
|
|
size_t len = strlen (env);
|
|
char buf[len + 20];
|
|
sprintf (buf, "%s.%u", env, __getpid ());
|
|
fd = open_not_cancel (buf, O_CREAT|O_TRUNC|O_WRONLY|O_NOFOLLOW, 0666);
|
|
}
|
|
|
|
if (fd == -1)
|
|
{
|
|
fd = open_not_cancel ("gmon.out", O_CREAT|O_TRUNC|O_WRONLY|O_NOFOLLOW,
|
|
0666);
|
|
if (fd < 0)
|
|
{
|
|
char buf[300];
|
|
int errnum = errno;
|
|
#ifdef USE_IN_LIBIO
|
|
if (_IO_fwide (stderr, 0) > 0)
|
|
__fwprintf (stderr, L"_mcleanup: gmon.out: %s\n",
|
|
__strerror_r (errnum, buf, sizeof buf));
|
|
else
|
|
#endif
|
|
fprintf (stderr, "_mcleanup: gmon.out: %s\n",
|
|
__strerror_r (errnum, buf, sizeof buf));
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* write gmon.out header: */
|
|
memset (&ghdr, '\0', sizeof (struct gmon_hdr));
|
|
memcpy (&ghdr.cookie[0], GMON_MAGIC, sizeof (ghdr.cookie));
|
|
*(int32_t *) ghdr.version = GMON_VERSION;
|
|
write_not_cancel (fd, &ghdr, sizeof (struct gmon_hdr));
|
|
|
|
/* write PC histogram: */
|
|
write_hist (fd);
|
|
|
|
/* write call-graph: */
|
|
write_call_graph (fd);
|
|
|
|
/* write basic-block execution counts: */
|
|
write_bb_counts (fd);
|
|
|
|
close_not_cancel_no_status (fd);
|
|
}
|
|
|
|
|
|
void
|
|
__write_profiling (void)
|
|
{
|
|
int save = _gmonparam.state;
|
|
_gmonparam.state = GMON_PROF_OFF;
|
|
if (save == GMON_PROF_ON)
|
|
write_gmon ();
|
|
_gmonparam.state = save;
|
|
}
|
|
#ifndef SHARED
|
|
/* This symbol isn't used anywhere in the DSO and it is not exported.
|
|
This would normally mean it should be removed to get the same API
|
|
in static libraries. But since profiling is special in static libs
|
|
anyway we keep it. But not when building the DSO since some
|
|
quality assurance tests will otherwise trigger. */
|
|
weak_alias (__write_profiling, write_profiling)
|
|
#endif
|
|
|
|
|
|
void
|
|
_mcleanup (void)
|
|
{
|
|
__moncontrol (0);
|
|
|
|
if (_gmonparam.state != GMON_PROF_ERROR)
|
|
write_gmon ();
|
|
|
|
/* free the memory. */
|
|
if (_gmonparam.tos != NULL)
|
|
free (_gmonparam.tos);
|
|
}
|