gecko-dev/tools/profiler/TableTicker.cpp
Nicholas Nethercote 2eb56008e2 Bug 1062709 (part 1, attempt 2) - Add a frame number argument to NS_WalkStackCallback. r=dbaron.
--HG--
extra : rebase_source : 4f7060a9ae0bed180899651c50e8ea8857e72d63
2014-09-10 21:47:01 -07:00

877 lines
27 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
#include <algorithm>
#include <string>
#include <stdio.h>
#include <fstream>
#include <sstream>
#include "GeckoProfiler.h"
#include "SaveProfileTask.h"
#include "ProfileEntry.h"
#include "SyncProfile.h"
#include "platform.h"
#include "nsThreadUtils.h"
#include "prenv.h"
#include "prtime.h"
#include "shared-libraries.h"
#include "mozilla/StackWalk.h"
#include "TableTicker.h"
#include "nsXULAppAPI.h"
// JSON
#include "JSStreamWriter.h"
// Meta
#include "nsXPCOM.h"
#include "nsXPCOMCID.h"
#include "nsIHttpProtocolHandler.h"
#include "nsServiceManagerUtils.h"
#include "nsIXULRuntime.h"
#include "nsIXULAppInfo.h"
#include "nsDirectoryServiceUtils.h"
#include "nsDirectoryServiceDefs.h"
#include "nsIObserverService.h"
#include "mozilla/Services.h"
#include "PlatformMacros.h"
#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
#include "AndroidBridge.h"
#endif
// JS
#include "jsfriendapi.h"
#include "js/ProfilingFrameIterator.h"
#if defined(MOZ_PROFILING) && (defined(XP_MACOSX) || defined(XP_WIN))
#define USE_NS_STACKWALK
#endif
#ifdef USE_NS_STACKWALK
#include "nsStackWalk.h"
#endif
#if defined(XP_WIN)
typedef CONTEXT tickcontext_t;
#elif defined(LINUX)
#include <ucontext.h>
typedef ucontext_t tickcontext_t;
#endif
#if defined(LINUX) || defined(XP_MACOSX)
#include <sys/types.h>
pid_t gettid();
#endif
#if defined(SPS_ARCH_arm) && defined(MOZ_WIDGET_GONK)
// Should also work on other Android and ARM Linux, but not tested there yet.
#define USE_EHABI_STACKWALK
#endif
#ifdef USE_EHABI_STACKWALK
#include "EHABIStackWalk.h"
#endif
using std::string;
using namespace mozilla;
#ifndef MAXPATHLEN
#ifdef PATH_MAX
#define MAXPATHLEN PATH_MAX
#elif defined(MAX_PATH)
#define MAXPATHLEN MAX_PATH
#elif defined(_MAX_PATH)
#define MAXPATHLEN _MAX_PATH
#elif defined(CCHMAXPATH)
#define MAXPATHLEN CCHMAXPATH
#else
#define MAXPATHLEN 1024
#endif
#endif
///////////////////////////////////////////////////////////////////////
// BEGIN SaveProfileTask et al
std::string GetSharedLibraryInfoString();
void TableTicker::HandleSaveRequest()
{
if (!mSaveRequested)
return;
mSaveRequested = false;
// TODO: Use use the ipc/chromium Tasks here to support processes
// without XPCOM.
nsCOMPtr<nsIRunnable> runnable = new SaveProfileTask();
NS_DispatchToMainThread(runnable);
}
void TableTicker::StreamMetaJSCustomObject(JSStreamWriter& b)
{
b.BeginObject();
b.NameValue("version", 2);
b.NameValue("interval", interval());
b.NameValue("stackwalk", mUseStackWalk);
b.NameValue("jank", mJankOnly);
b.NameValue("processType", XRE_GetProcessType());
mozilla::TimeDuration delta = mozilla::TimeStamp::Now() - sStartTime;
b.NameValue("startTime", static_cast<double>(PR_Now()/1000.0 - delta.ToMilliseconds()));
nsresult res;
nsCOMPtr<nsIHttpProtocolHandler> http = do_GetService(NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX "http", &res);
if (!NS_FAILED(res)) {
nsAutoCString string;
res = http->GetPlatform(string);
if (!NS_FAILED(res))
b.NameValue("platform", string.Data());
res = http->GetOscpu(string);
if (!NS_FAILED(res))
b.NameValue("oscpu", string.Data());
res = http->GetMisc(string);
if (!NS_FAILED(res))
b.NameValue("misc", string.Data());
}
nsCOMPtr<nsIXULRuntime> runtime = do_GetService("@mozilla.org/xre/runtime;1");
if (runtime) {
nsAutoCString string;
res = runtime->GetXPCOMABI(string);
if (!NS_FAILED(res))
b.NameValue("abi", string.Data());
res = runtime->GetWidgetToolkit(string);
if (!NS_FAILED(res))
b.NameValue("toolkit", string.Data());
}
nsCOMPtr<nsIXULAppInfo> appInfo = do_GetService("@mozilla.org/xre/app-info;1");
if (appInfo) {
nsAutoCString string;
res = appInfo->GetName(string);
if (!NS_FAILED(res))
b.NameValue("product", string.Data());
}
b.EndObject();
}
void TableTicker::ToStreamAsJSON(std::ostream& stream)
{
JSStreamWriter b(stream);
StreamJSObject(b);
}
JSObject* TableTicker::ToJSObject(JSContext *aCx)
{
JS::RootedValue val(aCx);
std::stringstream ss;
{
// Define a scope to prevent a moving GC during ~JSStreamWriter from
// trashing the return value.
JSStreamWriter b(ss);
StreamJSObject(b);
NS_ConvertUTF8toUTF16 js_string(nsDependentCString(ss.str().c_str()));
JS_ParseJSON(aCx, static_cast<const char16_t*>(js_string.get()),
js_string.Length(), &val);
}
return &val.toObject();
}
struct SubprocessClosure {
explicit SubprocessClosure(JSStreamWriter *aWriter)
: mWriter(aWriter)
{}
JSStreamWriter* mWriter;
};
void SubProcessCallback(const char* aProfile, void* aClosure)
{
// Called by the observer to get their profile data included
// as a sub profile
SubprocessClosure* closure = (SubprocessClosure*)aClosure;
// Add the string profile into the profile
closure->mWriter->Value(aProfile);
}
#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
static
void BuildJavaThreadJSObject(JSStreamWriter& b)
{
b.BeginObject();
b.NameValue("name", "Java Main Thread");
b.Name("samples");
b.BeginArray();
// for each sample
for (int sampleId = 0; true; sampleId++) {
bool firstRun = true;
// for each frame
for (int frameId = 0; true; frameId++) {
nsCString result;
bool hasFrame = AndroidBridge::Bridge()->GetFrameNameJavaProfiling(0, sampleId, frameId, result);
// when we run out of frames, we stop looping
if (!hasFrame) {
// if we found at least one frame, we have objects to close
if (!firstRun) {
b.EndArray();
b.EndObject();
}
break;
}
// the first time around, open the sample object and frames array
if (firstRun) {
firstRun = false;
double sampleTime =
mozilla::widget::android::GeckoJavaSampler::GetSampleTimeJavaProfiling(0, sampleId);
b.BeginObject();
b.NameValue("time", sampleTime);
b.Name("frames");
b.BeginArray();
}
// add a frame to the sample
b.BeginObject();
b.NameValue("location", result.BeginReading());
b.EndObject();
}
// if we found no frames for this sample, we are done
if (firstRun) {
break;
}
}
b.EndArray();
b.EndObject();
}
#endif
void TableTicker::StreamJSObject(JSStreamWriter& b)
{
b.BeginObject();
// Put shared library info
b.NameValue("libs", GetSharedLibraryInfoString().c_str());
// Put meta data
b.Name("meta");
StreamMetaJSCustomObject(b);
// Lists the samples for each ThreadProfile
b.Name("threads");
b.BeginArray();
SetPaused(true);
{
mozilla::MutexAutoLock lock(*sRegisteredThreadsMutex);
for (size_t i = 0; i < sRegisteredThreads->size(); i++) {
// Thread not being profiled, skip it
if (!sRegisteredThreads->at(i)->Profile())
continue;
MutexAutoLock lock(*sRegisteredThreads->at(i)->Profile()->GetMutex());
sRegisteredThreads->at(i)->Profile()->StreamJSObject(b);
}
}
if (Sampler::CanNotifyObservers()) {
// Send a event asking any subprocesses (plugins) to
// give us their information
SubprocessClosure closure(&b);
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
nsRefPtr<ProfileSaveEvent> pse = new ProfileSaveEvent(SubProcessCallback, &closure);
os->NotifyObservers(pse, "profiler-subprocess", nullptr);
}
}
#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
if (ProfileJava()) {
mozilla::widget::android::GeckoJavaSampler::PauseJavaProfiling();
BuildJavaThreadJSObject(b);
mozilla::widget::android::GeckoJavaSampler::UnpauseJavaProfiling();
}
#endif
SetPaused(false);
b.EndArray();
b.EndObject();
}
// END SaveProfileTask et al
////////////////////////////////////////////////////////////////////////
static
void addDynamicTag(ThreadProfile &aProfile, char aTagName, const char *aStr)
{
aProfile.addTag(ProfileEntry(aTagName, ""));
// Add one to store the null termination
size_t strLen = strlen(aStr) + 1;
for (size_t j = 0; j < strLen;) {
// Store as many characters in the void* as the platform allows
char text[sizeof(void*)];
size_t len = sizeof(void*)/sizeof(char);
if (j+len >= strLen) {
len = strLen - j;
}
memcpy(text, &aStr[j], len);
j += sizeof(void*)/sizeof(char);
// Cast to *((void**) to pass the text data to a void*
aProfile.addTag(ProfileEntry('d', *((void**)(&text[0]))));
}
}
static
void addPseudoEntry(volatile StackEntry &entry, ThreadProfile &aProfile,
PseudoStack *stack, void *lastpc)
{
// Pseudo-frames with the ASMJS flag are just annotations and should not be
// recorded in the profile.
if (entry.hasFlag(StackEntry::ASMJS))
return;
int lineno = -1;
// First entry has tagName 's' (start)
// Check for magic pointer bit 1 to indicate copy
const char* sampleLabel = entry.label();
if (entry.isCopyLabel()) {
// Store the string using 1 or more 'd' (dynamic) tags
// that will happen to the preceding tag
addDynamicTag(aProfile, 'c', sampleLabel);
if (entry.isJs()) {
if (!entry.pc()) {
// The JIT only allows the top-most entry to have a nullptr pc
MOZ_ASSERT(&entry == &stack->mStack[stack->stackSize() - 1]);
// If stack-walking was disabled, then that's just unfortunate
if (lastpc) {
jsbytecode *jspc = js::ProfilingGetPC(stack->mRuntime, entry.script(),
lastpc);
if (jspc) {
lineno = JS_PCToLineNumber(entry.script(), jspc);
}
}
} else {
lineno = JS_PCToLineNumber(entry.script(), entry.pc());
}
} else {
lineno = entry.line();
}
} else {
aProfile.addTag(ProfileEntry('c', sampleLabel));
// XXX: Bug 1010578. Don't assume a CPP entry and try to get the
// line for js entries as well.
if (entry.isCpp()) {
lineno = entry.line();
}
}
if (lineno != -1) {
aProfile.addTag(ProfileEntry('n', lineno));
}
uint32_t category = entry.category();
MOZ_ASSERT(!(category & StackEntry::IS_CPP_ENTRY));
MOZ_ASSERT(!(category & StackEntry::FRAME_LABEL_COPY));
if (category) {
aProfile.addTag(ProfileEntry('y', (int)category));
}
}
struct NativeStack
{
void** pc_array;
void** sp_array;
size_t size;
size_t count;
};
struct JSFrame
{
void* stackAddress;
const char* label;
};
static
void mergeStacksIntoProfile(ThreadProfile& aProfile, TickSample* aSample, NativeStack& aNativeStack)
{
PseudoStack* pseudoStack = aProfile.GetPseudoStack();
volatile StackEntry *pseudoFrames = pseudoStack->mStack;
uint32_t pseudoCount = pseudoStack->stackSize();
// Make a copy of the JS stack into a JSFrame array. This is necessary since,
// like the native stack, the JS stack is iterated youngest-to-oldest and we
// need to iterate oldest-to-youngest when adding entries to aProfile.
JSFrame jsFrames[1000];
uint32_t jsCount = 0;
if (aSample && pseudoStack->mRuntime) {
JS::ProfilingFrameIterator::RegisterState registerState;
registerState.pc = aSample->pc;
registerState.sp = aSample->sp;
#ifdef ENABLE_ARM_LR_SAVING
registerState.lr = aSample->lr;
#endif
JS::ProfilingFrameIterator jsIter(pseudoStack->mRuntime, registerState);
for (; jsCount < mozilla::ArrayLength(jsFrames) && !jsIter.done(); ++jsCount, ++jsIter) {
jsFrames[jsCount].stackAddress = jsIter.stackAddress();
jsFrames[jsCount].label = jsIter.label();
}
}
// Start the sample with a root entry.
aProfile.addTag(ProfileEntry('s', "(root)"));
// While the pseudo-stack array is ordered oldest-to-youngest, the JS and
// native arrays are ordered youngest-to-oldest. We must add frames to
// aProfile oldest-to-youngest. Thus, iterate over the pseudo-stack forwards
// and JS and native arrays backwards. Note: this means the terminating
// condition jsIndex and nativeIndex is being < 0.
uint32_t pseudoIndex = 0;
int32_t jsIndex = jsCount - 1;
int32_t nativeIndex = aNativeStack.count - 1;
// Iterate as long as there is at least one frame remaining.
while (pseudoIndex != pseudoCount || jsIndex >= 0 || nativeIndex >= 0) {
// There are 1 to 3 frames available. Find and add the oldest. Handle pseudo
// frames first, since there are two special cases that must be considered
// before everything else.
if (pseudoIndex != pseudoCount) {
volatile StackEntry &pseudoFrame = pseudoFrames[pseudoIndex];
// isJs pseudo-stack frames assume the stackAddress of the preceding isCpp
// pseudo-stack frame. If we arrive at an isJs pseudo frame, we've already
// encountered the preceding isCpp stack frame and it was oldest, we can
// assume the isJs frame is oldest without checking other frames.
if (pseudoFrame.isJs()) {
addPseudoEntry(pseudoFrame, aProfile, pseudoStack, nullptr);
pseudoIndex++;
continue;
}
// Currently, only asm.js frames use the JS stack and Ion/Baseline/Interp
// frames use the pseudo stack. In the optimized asm.js->Ion call path, no
// isCpp frame is pushed, leading to the callstack:
// old | pseudo isCpp | asm.js | pseudo isJs | new
// Since there is no interleaving isCpp pseudo frame between the asm.js
// and isJs pseudo frame, the above isJs logic will render the callstack:
// old | pseudo isCpp | pseudo isJs | asm.js | new
// which is wrong. To deal with this, a pseudo isCpp frame pushed right
// before entering asm.js flagged with StackEntry::ASMJS. When we see this
// flag, we first push all the asm.js frames (up to the next frame with a
// stackAddress) before pushing the isJs frames. There is no Ion->asm.js
// fast path, so we don't have to worry about asm.js->Ion->asm.js.
//
// (This and the above isJs special cases can be removed once all JS
// execution modes switch from the pseudo stack to the JS stack.)
if (pseudoFrame.hasFlag(StackEntry::ASMJS)) {
void *stopStackAddress = nullptr;
for (uint32_t i = pseudoIndex + 1; i != pseudoCount; i++) {
if (pseudoFrames[i].isCpp()) {
stopStackAddress = pseudoFrames[i].stackAddress();
break;
}
}
if (nativeIndex >= 0) {
stopStackAddress = std::max(stopStackAddress, aNativeStack.sp_array[nativeIndex]);
}
while (jsIndex >= 0 && jsFrames[jsIndex].stackAddress > stopStackAddress) {
addDynamicTag(aProfile, 'c', jsFrames[jsIndex].label);
jsIndex--;
}
pseudoIndex++;
continue;
}
// Finally, consider the normal case of a plain C++ pseudo-frame.
if ((jsIndex < 0 || pseudoFrame.stackAddress() > jsFrames[jsIndex].stackAddress) &&
(nativeIndex < 0 || pseudoFrame.stackAddress() > aNativeStack.sp_array[nativeIndex]))
{
// The (C++) pseudo-frame is the oldest.
addPseudoEntry(pseudoFrame, aProfile, pseudoStack, nullptr);
pseudoIndex++;
continue;
}
}
if (jsIndex >= 0) {
// Test whether the JS frame is the oldest.
JSFrame &jsFrame = jsFrames[jsIndex];
if ((pseudoIndex == pseudoCount || jsFrame.stackAddress > pseudoFrames[pseudoIndex].stackAddress()) &&
(nativeIndex < 0 || jsFrame.stackAddress > aNativeStack.sp_array[nativeIndex]))
{
// The JS frame is the oldest.
addDynamicTag(aProfile, 'c', jsFrame.label);
jsIndex--;
continue;
}
}
// If execution reaches this point, there must be a native frame and it must
// be the oldest.
MOZ_ASSERT(nativeIndex >= 0);
aProfile.addTag(ProfileEntry('l', (void*)aNativeStack.pc_array[nativeIndex]));
nativeIndex--;
}
}
#ifdef USE_NS_STACKWALK
static
void StackWalkCallback(uint32_t aFrameNumber, void* aPC, void* aSP,
void* aClosure)
{
NativeStack* nativeStack = static_cast<NativeStack*>(aClosure);
MOZ_ASSERT(nativeStack->count < nativeStack->size);
nativeStack->sp_array[nativeStack->count] = aSP;
nativeStack->pc_array[nativeStack->count] = aPC;
nativeStack->count++;
}
void TableTicker::doNativeBacktrace(ThreadProfile &aProfile, TickSample* aSample)
{
#ifndef XP_MACOSX
uintptr_t thread = GetThreadHandle(aSample->threadProfile->GetPlatformData());
MOZ_ASSERT(thread);
#endif
void* pc_array[1000];
void* sp_array[1000];
NativeStack nativeStack = {
pc_array,
sp_array,
mozilla::ArrayLength(pc_array),
0
};
// Start with the current function. We use 0 as the frame number here because
// the FramePointerStackWalk() and NS_StackWalk() calls below will use 1..N.
// This is a bit weird but it doesn't matter because StackWalkCallback()
// doesn't use the frame number argument.
StackWalkCallback(/* frameNumber */ 0, aSample->pc, aSample->sp, &nativeStack);
uint32_t maxFrames = uint32_t(nativeStack.size - nativeStack.count);
#ifdef XP_MACOSX
pthread_t pt = GetProfiledThread(aSample->threadProfile->GetPlatformData());
void *stackEnd = reinterpret_cast<void*>(-1);
if (pt)
stackEnd = static_cast<char*>(pthread_get_stackaddr_np(pt));
nsresult rv = NS_OK;
if (aSample->fp >= aSample->sp && aSample->fp <= stackEnd)
rv = FramePointerStackWalk(StackWalkCallback, /* skipFrames */ 0,
maxFrames, &nativeStack,
reinterpret_cast<void**>(aSample->fp), stackEnd);
#else
void *platformData = nullptr;
#ifdef XP_WIN
if (aSample->isSamplingCurrentThread) {
// In this case we want NS_StackWalk to know that it's walking the
// current thread's stack, so we pass 0 as the thread handle.
thread = 0;
}
platformData = aSample->context;
#endif // XP_WIN
nsresult rv = NS_StackWalk(StackWalkCallback, /* skipFrames */ 0, maxFrames,
&nativeStack, thread, platformData);
#endif
if (NS_SUCCEEDED(rv))
mergeStacksIntoProfile(aProfile, aSample, nativeStack);
}
#endif
#ifdef USE_EHABI_STACKWALK
void TableTicker::doNativeBacktrace(ThreadProfile &aProfile, TickSample* aSample)
{
void *pc_array[1000];
void *sp_array[1000];
NativeStack nativeStack = {
pc_array,
sp_array,
mozilla::ArrayLength(pc_array),
0
};
const mcontext_t *mcontext = &reinterpret_cast<ucontext_t *>(aSample->context)->uc_mcontext;
mcontext_t savedContext;
PseudoStack *pseudoStack = aProfile.GetPseudoStack();
nativeStack.count = 0;
// The pseudostack contains an "EnterJIT" frame whenever we enter
// JIT code with profiling enabled; the stack pointer value points
// the saved registers. We use this to unwind resume unwinding
// after encounting JIT code.
for (uint32_t i = pseudoStack->stackSize(); i > 0; --i) {
// The pseudostack grows towards higher indices, so we iterate
// backwards (from callee to caller).
volatile StackEntry &entry = pseudoStack->mStack[i - 1];
if (!entry.isJs() && strcmp(entry.label(), "EnterJIT") == 0) {
// Found JIT entry frame. Unwind up to that point (i.e., force
// the stack walk to stop before the block of saved registers;
// note that it yields nondecreasing stack pointers), then restore
// the saved state.
uint32_t *vSP = reinterpret_cast<uint32_t*>(entry.stackAddress());
nativeStack.count += EHABIStackWalk(*mcontext,
/* stackBase = */ vSP,
sp_array + nativeStack.count,
pc_array + nativeStack.count,
nativeStack.size - nativeStack.count);
memset(&savedContext, 0, sizeof(savedContext));
// See also: struct EnterJITStack in js/src/jit/arm/Trampoline-arm.cpp
savedContext.arm_r4 = *vSP++;
savedContext.arm_r5 = *vSP++;
savedContext.arm_r6 = *vSP++;
savedContext.arm_r7 = *vSP++;
savedContext.arm_r8 = *vSP++;
savedContext.arm_r9 = *vSP++;
savedContext.arm_r10 = *vSP++;
savedContext.arm_fp = *vSP++;
savedContext.arm_lr = *vSP++;
savedContext.arm_sp = reinterpret_cast<uint32_t>(vSP);
savedContext.arm_pc = savedContext.arm_lr;
mcontext = &savedContext;
}
}
// Now unwind whatever's left (starting from either the last EnterJIT
// frame or, if no EnterJIT was found, the original registers).
nativeStack.count += EHABIStackWalk(*mcontext,
aProfile.GetStackTop(),
sp_array + nativeStack.count,
pc_array + nativeStack.count,
nativeStack.size - nativeStack.count);
mergeStacksIntoProfile(aProfile, aSample, nativeStack);
}
#endif
static
void doSampleStackTrace(ThreadProfile &aProfile, TickSample *aSample, bool aAddLeafAddresses)
{
NativeStack nativeStack = { nullptr, nullptr, 0, 0 };
mergeStacksIntoProfile(aProfile, aSample, nativeStack);
#ifdef ENABLE_SPS_LEAF_DATA
if (aSample && aAddLeafAddresses) {
aProfile.addTag(ProfileEntry('l', (void*)aSample->pc));
#ifdef ENABLE_ARM_LR_SAVING
aProfile.addTag(ProfileEntry('L', (void*)aSample->lr));
#endif
}
#endif
}
void TableTicker::Tick(TickSample* sample)
{
if (HasUnwinderThread()) {
UnwinderTick(sample);
} else {
InplaceTick(sample);
}
}
void TableTicker::InplaceTick(TickSample* sample)
{
ThreadProfile& currThreadProfile = *sample->threadProfile;
PseudoStack* stack = currThreadProfile.GetPseudoStack();
stack->updateGeneration(currThreadProfile.GetGenerationID());
bool recordSample = true;
#if defined(XP_WIN)
bool powerSample = false;
#endif
/* Don't process the PeudoStack's markers or honour jankOnly if we're
immediately sampling the current thread. */
if (!sample->isSamplingCurrentThread) {
// Marker(s) come before the sample
ProfilerMarkerLinkedList* pendingMarkersList = stack->getPendingMarkers();
while (pendingMarkersList && pendingMarkersList->peek()) {
ProfilerMarker* marker = pendingMarkersList->popHead();
stack->addStoredMarker(marker);
currThreadProfile.addTag(ProfileEntry('m', marker));
}
#if defined(XP_WIN)
if (mProfilePower) {
mIntelPowerGadget->TakeSample();
powerSample = true;
}
#endif
if (mJankOnly) {
// if we are on a different event we can discard any temporary samples
// we've kept around
if (sLastSampledEventGeneration != sCurrentEventGeneration) {
// XXX: we also probably want to add an entry to the profile to help
// distinguish which samples are part of the same event. That, or record
// the event generation in each sample
currThreadProfile.erase();
}
sLastSampledEventGeneration = sCurrentEventGeneration;
recordSample = false;
// only record the events when we have a we haven't seen a tracer event for 100ms
if (!sLastTracerEvent.IsNull()) {
mozilla::TimeDuration delta = sample->timestamp - sLastTracerEvent;
if (delta.ToMilliseconds() > 100.0) {
recordSample = true;
}
}
}
}
#if defined(USE_NS_STACKWALK) || defined(USE_EHABI_STACKWALK)
if (mUseStackWalk) {
doNativeBacktrace(currThreadProfile, sample);
} else {
doSampleStackTrace(currThreadProfile, sample, mAddLeafAddresses);
}
#else
doSampleStackTrace(currThreadProfile, sample, mAddLeafAddresses);
#endif
if (recordSample)
currThreadProfile.flush();
if (sample && currThreadProfile.GetThreadResponsiveness()->HasData()) {
mozilla::TimeDuration delta = currThreadProfile.GetThreadResponsiveness()->GetUnresponsiveDuration(sample->timestamp);
currThreadProfile.addTag(ProfileEntry('r', static_cast<float>(delta.ToMilliseconds())));
}
if (sample) {
mozilla::TimeDuration delta = sample->timestamp - sStartTime;
currThreadProfile.addTag(ProfileEntry('t', static_cast<float>(delta.ToMilliseconds())));
}
// rssMemory is equal to 0 when we are not recording.
if (sample && sample->rssMemory != 0) {
currThreadProfile.addTag(ProfileEntry('R', static_cast<float>(sample->rssMemory)));
}
// ussMemory is equal to 0 when we are not recording.
if (sample && sample->ussMemory != 0) {
currThreadProfile.addTag(ProfileEntry('U', static_cast<float>(sample->ussMemory)));
}
#if defined(XP_WIN)
if (powerSample) {
currThreadProfile.addTag(ProfileEntry('p', static_cast<float>(mIntelPowerGadget->GetTotalPackagePowerInWatts())));
}
#endif
if (sLastFrameNumber != sFrameNumber) {
currThreadProfile.addTag(ProfileEntry('f', sFrameNumber));
sLastFrameNumber = sFrameNumber;
}
}
namespace {
SyncProfile* NewSyncProfile()
{
PseudoStack* stack = tlsPseudoStack.get();
if (!stack) {
MOZ_ASSERT(stack);
return nullptr;
}
Thread::tid_t tid = Thread::GetCurrentId();
ThreadInfo* info = new ThreadInfo("SyncProfile", tid, NS_IsMainThread(), stack, nullptr);
SyncProfile* profile = new SyncProfile(info, GET_BACKTRACE_DEFAULT_ENTRY);
return profile;
}
} // anonymous namespace
SyncProfile* TableTicker::GetBacktrace()
{
SyncProfile* profile = NewSyncProfile();
TickSample sample;
sample.threadProfile = profile;
#if defined(HAVE_NATIVE_UNWIND)
#if defined(XP_WIN) || defined(LINUX)
tickcontext_t context;
sample.PopulateContext(&context);
#elif defined(XP_MACOSX)
sample.PopulateContext(nullptr);
#endif
#endif
sample.isSamplingCurrentThread = true;
sample.timestamp = mozilla::TimeStamp::Now();
if (!HasUnwinderThread()) {
profile->BeginUnwind();
}
Tick(&sample);
if (!HasUnwinderThread()) {
profile->EndUnwind();
}
return profile;
}
static void print_callback(const ProfileEntry& entry, const char* tagStringData)
{
switch (entry.getTagName()) {
case 's':
case 'c':
printf_stderr(" %s\n", tagStringData);
}
}
void mozilla_sampler_print_location1()
{
if (!stack_key_initialized)
profiler_init(nullptr);
SyncProfile* syncProfile = NewSyncProfile();
if (!syncProfile) {
return;
}
syncProfile->BeginUnwind();
doSampleStackTrace(*syncProfile, nullptr, false);
syncProfile->EndUnwind();
printf_stderr("Backtrace:\n");
syncProfile->IterateTags(print_callback);
ThreadInfo* info = syncProfile->GetThreadInfo();
delete syncProfile;
delete info;
}