зеркало из https://github.com/mozilla/pjs.git
324 строки
8.3 KiB
C++
324 строки
8.3 KiB
C++
// The contents of this file are subject to the Mozilla Public License
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// Version 1.1 (the "License"); you may not use this file except in
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// compliance with the License. You may obtain a copy of the License
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// at http://www.mozilla.org/MPL/
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//
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// Software distributed under the License is distributed on an "AS IS"
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// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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// the License for the specific language governing rights and
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// limitations under the License.
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//
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// The Initial Developer of the Original Code is Kipp E.B. Hickman.
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// Portions Copyright 1999 by Jim Nance
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// Additional contributors:
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// L. David Baron - JP_REALTIME, JPROF_PTHREAD_HACK, and SIGUSR1 handling
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// The linux glibc hides part of sigaction if _POSIX_SOURCE is defined
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#if defined(linux)
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#undef _POSIX_SOURCE
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#endif
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// Some versions of glibc (i.e., the one that comes with RedHat 6.0 rather
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// than 6.1) seem to do things a bit differently when libpthread is involved.
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// If things don't work for you, try defining this:
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//#define JPROF_PTHREAD_HACK
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#include <stdlib.h>
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#include <signal.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include "libmalloc.h"
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <setjmp.h>
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#include <dlfcn.h>
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#ifdef NTO
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#include <sys/link.h>
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extern r_debug _r_debug;
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#else
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#include <link.h>
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#endif
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#ifdef NTO
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#define JB_BP 0x08
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#include <setjmp.h>
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#endif
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static int gLogFD = -1;
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static void startSignalCounter(unsigned long milisec);
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static void writeStrStdout(const char* str)
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{
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int len = strlen(str);
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if(len) {
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int wc, tot=0;
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do {
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wc = write(1, str, len);
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} while(wc>0 && (tot+=wc)<len);
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}
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}
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//----------------------------------------------------------------------
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#if defined(i386) || defined(_i386)
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static void CrawlStack(malloc_log_entry* me, jmp_buf jb, char* first)
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{
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#ifdef NTO
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u_long* bp = (u_long*) (jb[0].__jmpbuf_un.__savearea[JB_BP]);
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#else
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u_long* bp = (u_long*) (jb[0].__jmpbuf[JB_BP]);
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#endif
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u_long numpcs = 0;
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#ifdef JPROF_PTHREAD_HACK
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int skip = 3;
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#else
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// This is a linux hack we have to do to figure out where the signal was
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// called from
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me->pcs[numpcs++] = first;
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int skip = 3;
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#endif
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while (numpcs < MAX_STACK_CRAWL) {
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u_long* nextbp = (u_long*) *bp++;
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u_long pc = *bp;
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#ifdef JPROF_PTHREAD_HACK
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if ((pc < 0x08000000) || ((pc > 0x7fffffff) && (skip <= 0)) || (nextbp < bp)) {
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#else
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if ((pc < 0x08000000) || (pc > 0x7fffffff) || (nextbp < bp)) {
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#endif
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break;
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}
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if (--skip < 0) {
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me->pcs[numpcs++] = (char*) pc;
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}
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bp = nextbp;
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}
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me->numpcs = numpcs;
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}
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#endif
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//----------------------------------------------------------------------
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#if defined(linux) || defined(NTO)
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static void DumpAddressMap()
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{
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// Turn off the timer so we dont get interrupts during shutdown
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startSignalCounter(0);
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int mfd = open(M_MAPFILE, O_CREAT|O_WRONLY|O_TRUNC, 0666);
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if (mfd >= 0) {
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malloc_map_entry mme;
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link_map* map = _r_debug.r_map;
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while (NULL != map) {
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if (0 != map->l_addr) {
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mme.nameLen = strlen(map->l_name);
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mme.address = map->l_addr;
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write(mfd, &mme, sizeof(mme));
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write(mfd, map->l_name, mme.nameLen);
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#if 0
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write(1, map->l_name, mme.nameLen);
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write(1, "\n", 1);
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#endif
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}
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map = map->l_next;
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}
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close(mfd);
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}
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}
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#endif
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static void EndProfilingHook(int signum)
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{
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DumpAddressMap();
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writeStrStdout("Jprof: profiling paused.\n");
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}
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//----------------------------------------------------------------------
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static void
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Log(u_long aTime, char *first)
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{
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// Static is simply to make debugging tollerable
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static malloc_log_entry me;
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me.delTime = aTime;
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jmp_buf jb;
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setjmp(jb);
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CrawlStack(&me, jb, first);
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#ifndef NTO
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write(gLogFD, &me, offsetof(malloc_log_entry, pcs) + me.numpcs*sizeof(char*));
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#else
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printf("Neutrino is missing the pcs member of malloc_log_entry!! \n");
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#endif
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}
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static int realTime = 0;
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/* Lets interrupt at 10 Hz. This is so my log files don't get too large.
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* This can be changed to a faster value latter. This timer is not
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* programmed to reset, even though it is capable of doing so. This is
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* to keep from getting interrupts from inside of the handler.
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*/
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static void startSignalCounter(unsigned long milisec)
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{
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struct itimerval tvalue;
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tvalue.it_interval.tv_sec = 0;
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tvalue.it_interval.tv_usec = 0;
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tvalue.it_value.tv_sec = milisec/1000;
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tvalue.it_value.tv_usec = (milisec%1000)*1000;
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if (realTime) {
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setitimer(ITIMER_REAL, &tvalue, NULL);
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} else {
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setitimer(ITIMER_PROF, &tvalue, NULL);
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}
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}
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static long timerMiliSec = 50;
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static void StackHook(
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int signum,
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siginfo_t *info,
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void *mystry)
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{
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static struct timeval tFirst;
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static int first=1;
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size_t milisec;
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if(first && !(first=0)) {
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writeStrStdout("Jprof: received first timer signal\n");
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gettimeofday(&tFirst, 0);
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milisec = 0;
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} else {
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struct timeval tNow;
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gettimeofday(&tNow, 0);
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double usec = 1e6*(tNow.tv_sec - tFirst.tv_sec);
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usec += (tNow.tv_usec - tFirst.tv_usec);
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milisec = static_cast<size_t>(usec*1e-3);
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}
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#ifdef JPROF_PTHREAD_HACK
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Log(milisec, NULL);
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#else
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// The mystry[19] thing is a hack to figure out where we were called from.
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// By playing around with the debugger it looks like [19] contains the
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// information I need.
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// it's really ((ucontext_t *)mystry)->uc_mcontext.gregs[14] which is
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// the EIP register when the handler was called
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Log(milisec, ((char**)mystry)[19]);
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#endif
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startSignalCounter(timerMiliSec);
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}
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void setupProfilingStuff(void)
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{
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static int gFirstTime = 1;
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if(gFirstTime && !(gFirstTime=0)) {
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int startTimer = 1;
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int doNotStart = 1;
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int firstDelay = 0;
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char *tst = getenv("JPROF_FLAGS");
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/* Options from JPROF_FLAGS environment variable:
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* JP_DEFER -> Wait for a SIGPROF (or SIGALRM, if JP_REALTIME
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* is set) from userland before starting
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* to generate them internally
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* JP_START -> Install the signal handler
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* JP_PERIOD -> Time between prifiler ticks
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* JP_FIRST -> Extra delay before starting
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* JP_REALTIME -> Take stack traces in intervals of real time
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* rather than time used by the process (and the
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* system for the process). This is useful for
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* finding time spent by the X server.
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*/
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if(tst) {
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if(strstr(tst, "JP_DEFER"))
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{
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doNotStart = 0;
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startTimer = 0;
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}
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if(strstr(tst, "JP_START")) doNotStart = 0;
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if(strstr(tst, "JP_REALTIME")) realTime = 1;
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char *delay = strstr(tst,"JP_PERIOD=");
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if(delay) {
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double tmp = strtod(delay+10, NULL);
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if(tmp>1e-3) {
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timerMiliSec = static_cast<unsigned long>(1000 * tmp);
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}
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}
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char *first = strstr(tst, "JP_FIRST=");
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if(first) {
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firstDelay = atol(first+9);
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}
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}
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if(!doNotStart) {
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if(gLogFD<0) {
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gLogFD = open(M_LOGFILE, O_CREAT|O_WRONLY|O_TRUNC, 0666);
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if(gLogFD<0) {
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fprintf(stderr, "Unable to create " M_LOGFILE);
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perror(":");
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} else {
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struct sigaction action;
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sigset_t mset;
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char buffer[1024];
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// Dump out the address map when we terminate
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atexit(DumpAddressMap);
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sigemptyset(&mset);
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action.sa_handler = NULL;
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action.sa_sigaction = StackHook;
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action.sa_mask = mset;
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action.sa_flags = SA_RESTART | SA_SIGINFO;
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if (realTime) {
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sigaction(SIGALRM, &action, NULL);
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} else {
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sigaction(SIGPROF, &action, NULL);
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}
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// make it so a SIGUSR1 will stop the profiling
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// Note: It currently does not close the logfile.
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// This could be configurable (so that it could
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// later be reopened).
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struct sigaction stop_action;
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stop_action.sa_handler = EndProfilingHook;
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stop_action.sa_mask = mset;
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stop_action.sa_flags = SA_RESTART;
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sigaction(SIGUSR1, &stop_action, NULL);
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sprintf(buffer, "Jprof: Initialized signal hander and set "
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"timer for %lu mili-seconds with %d second initial delay\n",
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timerMiliSec, firstDelay);
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writeStrStdout(buffer);
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if(startTimer) {
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writeStrStdout("Jprof: started timer\n");
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startSignalCounter(firstDelay*1000 + timerMiliSec);
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}
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}
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}
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}
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} else {
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printf("setupProfilingStuff() called multiple times\n");
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}
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}
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