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gecko/tools/jprof/stub/libmalloc.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
// vim:cindent:sw=4:et:ts=8:
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape Communications Corp.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Jim Nance
* L. David Baron - JP_REALTIME, JPROF_PTHREAD_HACK, and SIGUSR1 handling
* Mike Shaver - JP_RTC_HZ support
* Randell Jesup - glibc backtrace() support
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
// The linux glibc hides part of sigaction if _POSIX_SOURCE is defined
#if defined(linux)
#undef _POSIX_SOURCE
#undef _SVID_SOURCE
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#endif
#include <errno.h>
#if defined(linux)
#include <linux/rtc.h>
#include <pthread.h>
#endif
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <ucontext.h>
#include <execinfo.h>
#include "libmalloc.h"
#include "jprof.h"
#include <string.h>
#include <errno.h>
#include <dlfcn.h>
#ifdef NTO
#include <sys/link.h>
extern r_debug _r_debug;
#else
#include <link.h>
#endif
#define USE_GLIBC_BACKTRACE 1
// To debug, use #define JPROF_STATIC
#define JPROF_STATIC //static
static int gLogFD = -1;
static pthread_t main_thread;
static void startSignalCounter(unsigned long millisec);
static int enableRTCSignals(bool enable);
//----------------------------------------------------------------------
// replace use of atexit()
static void DumpAddressMap();
struct JprofShutdown {
JprofShutdown() {}
~JprofShutdown() {
DumpAddressMap();
}
};
static void RegisterJprofShutdown() {
// This instanciates the dummy class above, and will trigger the class
// destructor when libxul is unloaded. This is equivalent to atexit(),
// but gracefully handles dlclose().
static JprofShutdown t;
}
#if defined(i386) || defined(_i386) || defined(__x86_64__)
JPROF_STATIC void CrawlStack(malloc_log_entry* me,
void* stack_top, void* top_instr_ptr)
{
#if USE_GLIBC_BACKTRACE
// This probably works on more than x86! But we need a way to get the
// top instruction pointer, which is kindof arch-specific
void *array[500];
int cnt, i;
u_long numpcs = 0;
bool tracing = false;
// This is from glibc. A more generic version might use
// libunwind and/or CaptureStackBackTrace() on Windows
cnt = backtrace(&array[0],sizeof(array)/sizeof(array[0]));
// StackHook->JprofLog->CrawlStack
// Then we have sigaction, which replaced top_instr_ptr
array[3] = top_instr_ptr;
for (i = 3; i < cnt; i++)
{
me->pcs[numpcs++] = (char *) array[i];
}
me->numpcs = numpcs;
#else
// original code - this breaks on many platforms
void **bp;
#if defined(__i386)
__asm__( "movl %%ebp, %0" : "=g"(bp));
#elif defined(__x86_64__)
__asm__( "movq %%rbp, %0" : "=g"(bp));
#else
// It would be nice if this worked uniformly, but at least on i386 and
// x86_64, it stopped working with gcc 4.1, because it points to the
// end of the saved registers instead of the start.
bp = __builtin_frame_address(0);
#endif
u_long numpcs = 0;
bool tracing = false;
me->pcs[numpcs++] = (char*) top_instr_ptr;
while (numpcs < MAX_STACK_CRAWL) {
void** nextbp = (void**) *bp++;
void* pc = *bp;
if (nextbp < bp) {
break;
}
if (tracing) {
// Skip the signal handling.
me->pcs[numpcs++] = (char*) pc;
}
else if (pc == top_instr_ptr) {
tracing = true;
}
bp = nextbp;
}
me->numpcs = numpcs;
#endif
}
#endif
//----------------------------------------------------------------------
static int rtcHz;
static int rtcFD = -1;
#if defined(linux) || defined(NTO)
static void DumpAddressMap()
{
// Turn off the timer so we don't get interrupts during shutdown
#if defined(linux)
if (rtcHz) {
enableRTCSignals(false);
} else
#endif
{
startSignalCounter(0);
}
int mfd = open(M_MAPFILE, O_CREAT|O_WRONLY|O_TRUNC, 0666);
if (mfd >= 0) {
malloc_map_entry mme;
link_map* map = _r_debug.r_map;
while (NULL != map) {
if (map->l_name && *map->l_name) {
mme.nameLen = strlen(map->l_name);
mme.address = map->l_addr;
write(mfd, &mme, sizeof(mme));
write(mfd, map->l_name, mme.nameLen);
#if 0
write(1, map->l_name, mme.nameLen);
write(1, "\n", 1);
#endif
}
map = map->l_next;
}
close(mfd);
}
}
#endif
static void EndProfilingHook(int signum)
{
DumpAddressMap();
puts("Jprof: profiling paused.");
}
//----------------------------------------------------------------------
JPROF_STATIC void
JprofLog(u_long aTime, void* stack_top, void* top_instr_ptr)
{
// Static is simply to make debugging tollerable
static malloc_log_entry me;
me.delTime = aTime;
me.thread = syscall(SYS_gettid); //gettid();
CrawlStack(&me, stack_top, top_instr_ptr);
#ifndef NTO
write(gLogFD, &me, offsetof(malloc_log_entry, pcs) + me.numpcs*sizeof(char*));
#else
printf("Neutrino is missing the pcs member of malloc_log_entry!! \n");
#endif
}
static int realTime;
/* Lets interrupt at 10 Hz. This is so my log files don't get too large.
* This can be changed to a faster value latter. This timer is not
* programmed to reset, even though it is capable of doing so. This is
* to keep from getting interrupts from inside of the handler.
*/
static void startSignalCounter(unsigned long millisec)
{
struct itimerval tvalue;
tvalue.it_interval.tv_sec = 0;
tvalue.it_interval.tv_usec = 0;
tvalue.it_value.tv_sec = millisec/1000;
tvalue.it_value.tv_usec = (millisec%1000)*1000;
if (realTime) {
setitimer(ITIMER_REAL, &tvalue, NULL);
} else {
setitimer(ITIMER_PROF, &tvalue, NULL);
}
}
static long timerMiliSec = 50;
#if defined(linux)
static int setupRTCSignals(int hz, struct sigaction *sap)
{
/* global */ rtcFD = open("/dev/rtc", O_RDONLY);
if (rtcFD < 0) {
perror("JPROF_RTC setup: open(\"/dev/rtc\", O_RDONLY)");
return 0;
}
if (sigaction(SIGIO, sap, NULL) == -1) {
perror("JPROF_RTC setup: sigaction(SIGIO)");
return 0;
}
if (ioctl(rtcFD, RTC_IRQP_SET, hz) == -1) {
perror("JPROF_RTC setup: ioctl(/dev/rtc, RTC_IRQP_SET, $JPROF_RTC_HZ)");
return 0;
}
if (ioctl(rtcFD, RTC_PIE_ON, 0) == -1) {
perror("JPROF_RTC setup: ioctl(/dev/rtc, RTC_PIE_ON)");
return 0;
}
if (fcntl(rtcFD, F_SETSIG, 0) == -1) {
perror("JPROF_RTC setup: fcntl(/dev/rtc, F_SETSIG, 0)");
return 0;
}
if (fcntl(rtcFD, F_SETOWN, getpid()) == -1) {
perror("JPROF_RTC setup: fcntl(/dev/rtc, F_SETOWN, getpid())");
return 0;
}
return 1;
}
static int enableRTCSignals(bool enable)
{
static bool enabled = false;
if (enabled == enable) {
return 0;
}
enabled = enable;
int flags = fcntl(rtcFD, F_GETFL);
if (flags < 0) {
perror("JPROF_RTC setup: fcntl(/dev/rtc, F_GETFL)");
return 0;
}
if (enable) {
flags |= FASYNC;
} else {
flags &= ~FASYNC;
}
if (fcntl(rtcFD, F_SETFL, flags) == -1) {
if (enable) {
perror("JPROF_RTC setup: fcntl(/dev/rtc, F_SETFL, flags | FASYNC)");
} else {
perror("JPROF_RTC setup: fcntl(/dev/rtc, F_SETFL, flags & ~FASYNC)");
}
return 0;
}
return 1;
}
#endif
JPROF_STATIC void StackHook(
int signum,
siginfo_t *info,
void *ucontext)
{
static struct timeval tFirst;
static int first=1;
size_t millisec = 0;
#if defined(linux)
if (rtcHz && pthread_self() != main_thread) {
// Only collect stack data on the main thread, for now.
return;
}
#endif
if(first && !(first=0)) {
puts("Jprof: received first signal");
#if defined(linux)
if (rtcHz) {
enableRTCSignals(true);
} else
#endif
{
gettimeofday(&tFirst, 0);
millisec = 0;
}
} else {
#if defined(linux)
if (rtcHz) {
enableRTCSignals(true);
} else
#endif
{
struct timeval tNow;
gettimeofday(&tNow, 0);
double usec = 1e6*(tNow.tv_sec - tFirst.tv_sec);
usec += (tNow.tv_usec - tFirst.tv_usec);
millisec = static_cast<size_t>(usec*1e-3);
}
}
gregset_t &gregs = ((ucontext_t*)ucontext)->uc_mcontext.gregs;
#ifdef __x86_64__
JprofLog(millisec, (void*)gregs[REG_RSP], (void*)gregs[REG_RIP]);
#else
JprofLog(millisec, (void*)gregs[REG_ESP], (void*)gregs[REG_EIP]);
#endif
if (!rtcHz)
startSignalCounter(timerMiliSec);
}
NS_EXPORT_(void) setupProfilingStuff(void)
{
static int gFirstTime = 1;
if(gFirstTime && !(gFirstTime=0)) {
int startTimer = 1;
int doNotStart = 1;
int firstDelay = 0;
int append = O_TRUNC;
char *tst = getenv("JPROF_FLAGS");
/* Options from JPROF_FLAGS environment variable:
* JP_DEFER -> Wait for a SIGPROF (or SIGALRM, if JP_REALTIME
* is set) from userland before starting
* to generate them internally
* JP_START -> Install the signal handler
* JP_PERIOD -> Time between profiler ticks
* JP_FIRST -> Extra delay before starting
* JP_REALTIME -> Take stack traces in intervals of real time
* rather than time used by the process (and the
* system for the process). This is useful for
* finding time spent by the X server.
* JP_APPEND -> Append to jprof-log rather than overwriting it.
* This is somewhat risky since it depends on the
* address map staying constant across multiple runs.
*/
if(tst) {
if(strstr(tst, "JP_DEFER"))
{
doNotStart = 0;
startTimer = 0;
}
if(strstr(tst, "JP_START")) doNotStart = 0;
if(strstr(tst, "JP_REALTIME")) realTime = 1;
if(strstr(tst, "JP_APPEND")) append = O_APPEND;
char *delay = strstr(tst,"JP_PERIOD=");
if(delay) {
double tmp = strtod(delay+strlen("JP_PERIOD="), NULL);
if (tmp>=1e-3) {
timerMiliSec = static_cast<unsigned long>(1000 * tmp);
} else {
fprintf(stderr,
"JP_PERIOD of %g less than 0.001 (1ms), using 1ms\n",
tmp);
timerMiliSec = 1;
}
}
char *first = strstr(tst, "JP_FIRST=");
if(first) {
firstDelay = atol(first+strlen("JP_FIRST="));
}
char *rtc = strstr(tst, "JP_RTC_HZ=");
if (rtc) {
#if defined(linux)
rtcHz = atol(rtc+strlen("JP_RTC_HZ="));
timerMiliSec = 0; /* This makes JP_FIRST work right. */
realTime = 1; /* It's the _R_TC and all. ;) */
#define IS_POWER_OF_TWO(x) (((x) & ((x) - 1)) == 0)
if (!IS_POWER_OF_TWO(rtcHz) || rtcHz < 2) {
fprintf(stderr, "JP_RTC_HZ must be power of two and >= 2, "
"but %d was provided; using default of 2048\n",
rtcHz);
rtcHz = 2048;
}
#else
fputs("JP_RTC_HZ found, but RTC profiling only supported on "
"Linux!\n", stderr);
#endif
}
}
if(!doNotStart) {
if(gLogFD<0) {
gLogFD = open(M_LOGFILE, O_CREAT | O_WRONLY | append, 0666);
if(gLogFD<0) {
fprintf(stderr, "Unable to create " M_LOGFILE);
perror(":");
} else {
struct sigaction action;
sigset_t mset;
// Dump out the address map when we terminate
RegisterJprofShutdown();
main_thread = pthread_self();
//fprintf(stderr,"jprof: main_thread = %u\n",
// (unsigned int)main_thread);
sigemptyset(&mset);
action.sa_handler = NULL;
action.sa_sigaction = StackHook;
action.sa_mask = mset;
action.sa_flags = SA_RESTART | SA_SIGINFO;
#if defined(linux)
if (rtcHz) {
if (!setupRTCSignals(rtcHz, &action)) {
fputs("jprof: Error initializing RTC, NOT "
"profiling\n", stderr);
return;
}
}
if (!rtcHz || firstDelay != 0)
#endif
if (realTime) {
sigaction(SIGALRM, &action, NULL);
} else {
sigaction(SIGPROF, &action, NULL);
}
// make it so a SIGUSR1 will stop the profiling
// Note: It currently does not close the logfile.
// This could be configurable (so that it could
// later be reopened).
struct sigaction stop_action;
stop_action.sa_handler = EndProfilingHook;
stop_action.sa_mask = mset;
stop_action.sa_flags = SA_RESTART;
sigaction(SIGUSR1, &stop_action, NULL);
printf("Jprof: Initialized signal handler and set "
"timer for %lu %s, %d s "
"initial delay\n",
rtcHz ? rtcHz : timerMiliSec,
rtcHz ? "Hz" : "ms",
firstDelay);
if(startTimer) {
#if defined(linux)
/* If we have an initial delay we can just use
startSignalCounter to set up a timer to fire the
first stackHook after that delay. When that happens
we'll go and switch to RTC profiling. */
if (rtcHz && firstDelay == 0) {
puts("Jprof: enabled RTC signals");
enableRTCSignals(true);
} else
#endif
{
puts("Jprof: started timer");
startSignalCounter(firstDelay*1000 + timerMiliSec);
}
}
}
}
}
} else {
printf("setupProfilingStuff() called multiple times\n");
}
}
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