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/*--------------------------------------------------------------------*/
/*--- Profiling machinery. #include this file into a skin to ---*/
/*--- enable --profile=yes, but not for release versions of skins, ---*/
/*--- because it uses glibc code. ---*/
/*--- vg_profile.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, an extensible x86 protected-mode
emulator for monitoring program execution on x86-Unixes.
Copyright (C) 2000-2002 Julian Seward
jseward@acm.org
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
*/
#ifndef __VG_PROFILE_C
#define __VG_PROFILE_C
#include "vg_skin.h"
/* get rid of these, if possible */
#include <signal.h>
#include <sys/time.h>
/* Override the empty definitions from vg_skin.h */
#undef VGP_PUSHCC
#undef VGP_POPCC
#define VGP_PUSHCC(x) if (VG_(clo_profile)) VGP_(pushcc)(x)
#define VGP_POPCC(x) if (VG_(clo_profile)) VGP_(popcc)(x)
#define VGP_M_STACK 20
#define VGP_MAX_CCS 50
/* All zeroed initially because they're static */
static Int vgp_nticks;
static Int vgp_counts [VGP_MAX_CCS];
static Int vgp_entries[VGP_MAX_CCS];
static Char* vgp_names [VGP_MAX_CCS];
static Int vgp_sp;
static UInt vgp_stack[VGP_M_STACK];
/* These definitions override the panicking ones in vg_profile.c */
void VGP_(register_profile_event) ( Int n, Char* name )
{
/* Adjust for negative values */
n += VgpUnc;
if (n >= VGP_MAX_CCS) {
VG_(printf)("\nProfile event #%d higher than VGP_MAX_CCS of %d.\n"
"If you really need this many profile events, increase\n"
"VGP_MAX_CCS and recompile Valgrind.\n",
n, VGP_MAX_CCS);
VG_(skin_panic)("profile event too high");
}
if (vgp_names[n] != NULL) {
VG_(printf)("\nProfile event #%d being registered as `%s'\n"
"already registered as `%s'.\n"
"Note that skin and core event numbers must not overlap.\n",
n, name, vgp_names[n]);
VG_(skin_panic)("profile event already registered");
}
vgp_names[n] = name;
}
void VGP_(tick) ( int sigNo )
{
Int cc;
vgp_nticks++;
cc = vgp_stack[vgp_sp];
vg_assert(cc >= 0 && cc < VGP_MAX_CCS);
vgp_counts[ cc ]++;
}
void VGP_(init_profiling) ( void )
{
struct itimerval value;
Int ret;
/* Register core events... tricky macro definition causes
VGP_(register_profile_event)() to be called once for each core event
in VGP_CORE_LIST. */
vg_assert(VgpUnc == 0);
# define VGP_PAIR(n,name) VGP_(register_profile_event)(n,name)
VGP_CORE_LIST;
# undef VGP_PAIR
vgp_sp = -1;
VGP_(pushcc) ( VgpUnc );
value.it_interval.tv_sec = 0;
value.it_interval.tv_usec = 10 * 1000;
value.it_value = value.it_interval;
signal(SIGPROF, VGP_(tick) );
ret = setitimer(ITIMER_PROF, &value, NULL);
if (ret != 0) VG_(core_panic)("vgp_init_profiling");
}
void VGP_(done_profiling) ( void )
{
Int i;
VG_(printf)("\nProfiling done, %d ticks\n", vgp_nticks);
for (i = 0; i < VGP_MAX_CCS; i++)
if (NULL != vgp_names[i])
VG_(printf)(
"%2d: %4d (%3d %%%%) ticks, %10d entries for %s\n",
i, vgp_counts[i],
(Int)(1000.0 * (double)vgp_counts[i] / (double)vgp_nticks),
vgp_entries[i], vgp_names[i] );
}
void VGP_(pushcc) ( UInt cc )
{
if (vgp_sp >= VGP_M_STACK-1) {
VG_(printf)(
"\nMaximum profile stack depth (%d) reached for event #%d (`%s').\n"
"This is probably due to a VGP_(pushcc)() without a matching\n"
"VGP_(popcc)(). Make sure they all match.\n"
"Or if you are nesting profiling events very deeply, increase\n"
"VGP_M_STACK and recompile Valgrind.\n",
VGP_M_STACK, cc, vgp_names[cc]);
VG_(skin_panic)("Profiling stack overflow");
}
vgp_sp++;
vgp_stack[vgp_sp] = cc;
vgp_entries[ cc ] ++;
}
void VGP_(popcc) ( UInt cc )
{
if (vgp_sp <= 0) {
VG_(printf)(
"\nProfile stack underflow. This is due to a VGP_(popcc)() without\n"
"a matching VGP_(pushcc)(). Make sure they all match.\n");
VG_(skin_panic)("Profiling stack underflow");
}
if (vgp_stack[vgp_sp] != cc) {
Int i;
VG_(printf)("popping %s, stack looks like:\n", vgp_names[cc]);
for (i = vgp_sp; i >= 0; i--)
VG_(printf)("%2d: %s\n", i, vgp_names[vgp_stack[i]]);
VG_(exit)(1);
}
vgp_sp--;
}
#endif /* __VG_PROFILE_C */
/*--------------------------------------------------------------------*/
/*--- end vg_profile.c ---*/
/*--------------------------------------------------------------------*/