summaryrefslogtreecommitdiffstats
path: root/tools/jprof/stub
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 14:29:10 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 14:29:10 +0000
commit2aa4a82499d4becd2284cdb482213d541b8804dd (patch)
treeb80bf8bf13c3766139fbacc530efd0dd9d54394c /tools/jprof/stub
parentInitial commit. (diff)
downloadfirefox-2aa4a82499d4becd2284cdb482213d541b8804dd.tar.xz
firefox-2aa4a82499d4becd2284cdb482213d541b8804dd.zip
Adding upstream version 86.0.1.upstream/86.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--tools/jprof/stub/Makefile.in8
-rw-r--r--tools/jprof/stub/config.h18
-rw-r--r--tools/jprof/stub/jprof.h17
-rw-r--r--tools/jprof/stub/libmalloc.cpp740
-rw-r--r--tools/jprof/stub/libmalloc.h45
-rw-r--r--tools/jprof/stub/moz.build17
6 files changed, 845 insertions, 0 deletions
diff --git a/tools/jprof/stub/Makefile.in b/tools/jprof/stub/Makefile.in
new file mode 100644
index 0000000000..8e6b6b8f8d
--- /dev/null
+++ b/tools/jprof/stub/Makefile.in
@@ -0,0 +1,8 @@
+#! gmake
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# override optimization
+MOZ_OPTIMIZE_FLAGS = -fno-omit-frame-pointer
diff --git a/tools/jprof/stub/config.h b/tools/jprof/stub/config.h
new file mode 100644
index 0000000000..6e5789452a
--- /dev/null
+++ b/tools/jprof/stub/config.h
@@ -0,0 +1,18 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef config_h___
+#define config_h___
+
+#define MAX_STACK_CRAWL 500
+#define M_LOGFILE "jprof-log"
+#define M_MAPFILE "jprof-map"
+
+#if defined(linux) || defined(NTO)
+# define USE_BFD
+# undef NEED_WRAPPERS
+
+#endif /* linux */
+
+#endif /* config_h___ */
diff --git a/tools/jprof/stub/jprof.h b/tools/jprof/stub/jprof.h
new file mode 100644
index 0000000000..c118760750
--- /dev/null
+++ b/tools/jprof/stub/jprof.h
@@ -0,0 +1,17 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef jprof_h___
+#define jprof_h___
+#include "nscore.h"
+
+#ifdef _IMPL_JPPROF_API
+# define JPROF_API(type) NS_EXPORT_(type)
+#else
+# define JPROF_API(type) NS_IMPORT_(type)
+#endif
+
+JPROF_API(void) setupProfilingStuff(void);
+
+#endif /* jprof_h___ */
diff --git a/tools/jprof/stub/libmalloc.cpp b/tools/jprof/stub/libmalloc.cpp
new file mode 100644
index 0000000000..3003543a93
--- /dev/null
+++ b/tools/jprof/stub/libmalloc.cpp
@@ -0,0 +1,740 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+// vim:cindent:sw=4:et:ts=8:
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// 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 bool gIsChild = false;
+static int gFilenamePID;
+
+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;
+
+ // 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;
+static bool circular = false;
+
+#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);
+ }
+
+ char filename[2048];
+ if (gIsChild)
+ snprintf(filename, sizeof(filename), "%s-%d", M_MAPFILE, gFilenamePID);
+ else
+ snprintf(filename, sizeof(filename), "%s", M_MAPFILE);
+
+ int mfd = open(filename, O_CREAT | O_WRONLY | O_TRUNC, 0666);
+ if (mfd >= 0) {
+ malloc_map_entry mme;
+ link_map* map = _r_debug.r_map;
+ while (nullptr != 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 bool was_paused = true;
+
+JPROF_STATIC void JprofBufferDump();
+JPROF_STATIC void JprofBufferClear();
+
+static void ClearProfilingHook(int signum) {
+ if (circular) {
+ JprofBufferClear();
+ puts("Jprof: cleared circular buffer.");
+ }
+}
+
+static void EndProfilingHook(int signum) {
+ if (circular) JprofBufferDump();
+
+ DumpAddressMap();
+ was_paused = true;
+ puts("Jprof: profiling paused.");
+}
+
+//----------------------------------------------------------------------
+// proper usage would be a template, including the function to find the
+// size of an entry, or include a size header explicitly to each entry.
+#if defined(linux)
+# define DUMB_LOCK() pthread_mutex_lock(&mutex);
+# define DUMB_UNLOCK() pthread_mutex_unlock(&mutex);
+#else
+# define DUMB_LOCK() FIXME()
+# define DUMB_UNLOCK() FIXME()
+#endif
+
+class DumbCircularBuffer {
+ public:
+ DumbCircularBuffer(size_t init_buffer_size) {
+ used = 0;
+ buffer_size = init_buffer_size;
+ buffer = (unsigned char*)malloc(buffer_size);
+ head = tail = buffer;
+
+#if defined(linux)
+ pthread_mutexattr_t mAttr;
+ pthread_mutexattr_settype(&mAttr, PTHREAD_MUTEX_RECURSIVE_NP);
+ pthread_mutex_init(&mutex, &mAttr);
+ pthread_mutexattr_destroy(&mAttr);
+#endif
+ }
+ ~DumbCircularBuffer() {
+ free(buffer);
+#if defined(linux)
+ pthread_mutex_destroy(&mutex);
+#endif
+ }
+
+ void clear() {
+ DUMB_LOCK();
+ head = tail;
+ used = 0;
+ DUMB_UNLOCK();
+ }
+
+ bool empty() { return head == tail; }
+
+ size_t space_available() {
+ size_t result;
+ DUMB_LOCK();
+ if (tail > head)
+ result = buffer_size - (tail - head) - 1;
+ else
+ result = head - tail - 1;
+ DUMB_UNLOCK();
+ return result;
+ }
+
+ void drop(size_t size) {
+ // assumes correctness!
+ DUMB_LOCK();
+ head += size;
+ if (head >= &buffer[buffer_size]) head -= buffer_size;
+ used--;
+ DUMB_UNLOCK();
+ }
+
+ bool insert(void* data, size_t size) {
+ // can fail if not enough space in the entire buffer
+ DUMB_LOCK();
+ if (space_available() < size) return false;
+
+ size_t max_without_wrap = &buffer[buffer_size] - tail;
+ size_t initial = size > max_without_wrap ? max_without_wrap : size;
+#if DEBUG_CIRCULAR
+ fprintf(stderr, "insert(%d): max_without_wrap %d, size %d, initial %d\n",
+ used, max_without_wrap, size, initial);
+#endif
+ memcpy(tail, data, initial);
+ tail += initial;
+ data = ((char*)data) + initial;
+ size -= initial;
+ if (size != 0) {
+#if DEBUG_CIRCULAR
+ fprintf(stderr, "wrapping by %d bytes\n", size);
+#endif
+ memcpy(buffer, data, size);
+ tail = &(((unsigned char*)buffer)[size]);
+ }
+
+ used++;
+ DUMB_UNLOCK();
+
+ return true;
+ }
+
+ // for external access to the buffer (saving)
+ void lock() { DUMB_LOCK(); }
+
+ void unlock() { DUMB_UNLOCK(); }
+
+ // XXX These really shouldn't be public...
+ unsigned char* head;
+ unsigned char* tail;
+ unsigned int used;
+ unsigned char* buffer;
+ size_t buffer_size;
+
+ private:
+ pthread_mutex_t mutex;
+};
+
+class DumbCircularBuffer* JprofBuffer;
+
+JPROF_STATIC void JprofBufferInit(size_t size) {
+ JprofBuffer = new DumbCircularBuffer(size);
+}
+
+JPROF_STATIC void JprofBufferClear() {
+ fprintf(stderr, "Told to clear JPROF circular buffer\n");
+ JprofBuffer->clear();
+}
+
+JPROF_STATIC size_t JprofEntrySizeof(malloc_log_entry* me) {
+ return offsetof(malloc_log_entry, pcs) + me->numpcs * sizeof(char*);
+}
+
+JPROF_STATIC void JprofBufferAppend(malloc_log_entry* me) {
+ size_t size = JprofEntrySizeof(me);
+
+ do {
+ while (JprofBuffer->space_available() < size && JprofBuffer->used > 0) {
+#if DEBUG_CIRCULAR
+ fprintf(
+ stderr,
+ "dropping entry: %d in use, %d free, need %d, size_to_free = %d\n",
+ JprofBuffer->used, JprofBuffer->space_available(), size,
+ JprofEntrySizeof((malloc_log_entry*)JprofBuffer->head));
+#endif
+ JprofBuffer->drop(JprofEntrySizeof((malloc_log_entry*)JprofBuffer->head));
+ }
+ if (JprofBuffer->space_available() < size) return;
+
+ } while (!JprofBuffer->insert(me, size));
+}
+
+JPROF_STATIC void JprofBufferDump() {
+ JprofBuffer->lock();
+#if DEBUG_CIRCULAR
+ fprintf(
+ stderr, "dumping JP_CIRCULAR buffer, %d of %d bytes\n",
+ JprofBuffer->tail > JprofBuffer->head
+ ? JprofBuffer->tail - JprofBuffer->head
+ : JprofBuffer->buffer_size + JprofBuffer->tail - JprofBuffer->head,
+ JprofBuffer->buffer_size);
+#endif
+ if (JprofBuffer->tail >= JprofBuffer->head) {
+ write(gLogFD, JprofBuffer->head, JprofBuffer->tail - JprofBuffer->head);
+ } else {
+ write(gLogFD, JprofBuffer->head,
+ &(JprofBuffer->buffer[JprofBuffer->buffer_size]) - JprofBuffer->head);
+ write(gLogFD, JprofBuffer->buffer, JprofBuffer->tail - JprofBuffer->buffer);
+ }
+ JprofBuffer->clear();
+ JprofBuffer->unlock();
+}
+
+//----------------------------------------------------------------------
+
+JPROF_STATIC void JprofLog(u_long aTime, void* stack_top, void* top_instr_ptr) {
+ // Static is simply to make debugging tolerable
+ static malloc_log_entry me;
+
+ me.delTime = aTime;
+ me.thread = syscall(SYS_gettid); // gettid();
+ if (was_paused) {
+ me.flags = JP_FIRST_AFTER_PAUSE;
+ was_paused = 0;
+ } else {
+ me.flags = 0;
+ }
+
+ CrawlStack(&me, stack_top, top_instr_ptr);
+
+#ifndef NTO
+ if (circular) {
+ JprofBufferAppend(&me);
+ } else {
+ write(gLogFD, &me, JprofEntrySizeof(&me));
+ }
+#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, nullptr);
+ } else {
+ setitimer(ITIMER_PROF, &tvalue, nullptr);
+ }
+}
+
+static long timerMilliSec = 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, nullptr) == -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(timerMilliSec);
+}
+
+NS_EXPORT_(void) setupProfilingStuff(void) {
+ static int gFirstTime = 1;
+ char filename[2048]; // XXX fix
+
+ 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.
+ * JP_FILENAME -> base filename to use when saving logs. Note that
+ * this does not affect the mapfile.
+ * JP_CIRCULAR -> use a circular buffer of size N, write/clear on SIGUSR1
+ *
+ * JPROF_ISCHILD is set if this is not the first process.
+ */
+
+ circular = false;
+
+ 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="), nullptr);
+ if (tmp >= 1e-3) {
+ timerMilliSec = static_cast<unsigned long>(1000 * tmp);
+ } else {
+ fprintf(stderr, "JP_PERIOD of %g less than 0.001 (1ms), using 1ms\n",
+ tmp);
+ timerMilliSec = 1;
+ }
+ }
+
+ char* circular_op = strstr(tst, "JP_CIRCULAR=");
+ if (circular_op) {
+ size_t size = atol(circular_op + strlen("JP_CIRCULAR="));
+ if (size < 1000) {
+ fprintf(stderr, "JP_CIRCULAR of %lu less than 1000, using 10000\n",
+ (unsigned long)size);
+ size = 10000;
+ }
+ JprofBufferInit(size);
+ fprintf(stderr, "JP_CIRCULAR buffer of %lu bytes\n",
+ (unsigned long)size);
+ circular = true;
+ }
+
+ 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="));
+ timerMilliSec = 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
+ }
+ const char* f = strstr(tst, "JP_FILENAME=");
+ if (f)
+ f = f + strlen("JP_FILENAME=");
+ else
+ f = M_LOGFILE;
+
+ char* is_child = getenv("JPROF_ISCHILD");
+ if (!is_child) setenv("JPROF_ISCHILD", "", 0);
+ gIsChild = !!is_child;
+
+ gFilenamePID = syscall(SYS_gettid); // gettid();
+ if (is_child)
+ snprintf(filename, sizeof(filename), "%s-%d", f, gFilenamePID);
+ else
+ snprintf(filename, sizeof(filename), "%s", f);
+
+ // XXX FIX! inherit current capture state!
+ }
+
+ if (!doNotStart) {
+ if (gLogFD < 0) {
+ gLogFD = open(filename, 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);
+
+ // FIX! probably should block these against each other
+ // Very unlikely.
+ sigemptyset(&mset);
+ action.sa_handler = nullptr;
+ 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, nullptr);
+ }
+ }
+ // enable PROF in all cases to simplify JP_DEFER/pause/restart
+ sigaction(SIGPROF, &action, nullptr);
+
+ // 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, nullptr);
+
+ // make it so a SIGUSR2 will clear the circular buffer
+
+ stop_action.sa_handler = ClearProfilingHook;
+ stop_action.sa_mask = mset;
+ stop_action.sa_flags = SA_RESTART;
+ sigaction(SIGUSR2, &stop_action, nullptr);
+
+ printf(
+ "Jprof: Initialized signal handler and set "
+ "timer for %lu %s, %d s "
+ "initial delay\n",
+ rtcHz ? rtcHz : timerMilliSec, 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 + timerMilliSec);
+ }
+ }
+ }
+ }
+ }
+ } else {
+ printf("setupProfilingStuff() called multiple times\n");
+ }
+}
diff --git a/tools/jprof/stub/libmalloc.h b/tools/jprof/stub/libmalloc.h
new file mode 100644
index 0000000000..a78b35ade8
--- /dev/null
+++ b/tools/jprof/stub/libmalloc.h
@@ -0,0 +1,45 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef libmalloc_h___
+#define libmalloc_h___
+
+#include <sys/types.h>
+#include <malloc.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "config.h"
+
+typedef unsigned long u_long;
+
+// For me->flags
+#define JP_FIRST_AFTER_PAUSE 1
+
+// Format of a jprof log entry. This is what's written out to the
+// "jprof-log" file.
+// It's called malloc_log_entry because the history of jprof is that
+// it's a modified version of tracemalloc.
+struct malloc_log_entry {
+ u_long delTime;
+ u_long numpcs;
+ unsigned int flags;
+ int thread;
+ char* pcs[MAX_STACK_CRAWL];
+};
+
+// Format of a malloc map entry; after this struct is nameLen+1 bytes of
+// name data.
+struct malloc_map_entry {
+ u_long nameLen;
+ u_long address; // base address
+};
+
+#ifdef __cplusplus
+} /* end of extern "C" */
+#endif
+
+#endif /* libmalloc_h___ */
diff --git a/tools/jprof/stub/moz.build b/tools/jprof/stub/moz.build
new file mode 100644
index 0000000000..692c6ea37f
--- /dev/null
+++ b/tools/jprof/stub/moz.build
@@ -0,0 +1,17 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+EXPORTS += [
+ "jprof.h",
+]
+
+SOURCES += [
+ "libmalloc.cpp",
+]
+
+SharedLibrary("jprof")
+
+DEFINES["_IMPL_JPROF_API"] = True