mirror of
https://github.com/mozilla/gecko-dev.git
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351 lines
12 KiB
C++
351 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// System
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#include <string>
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#include <stdio.h>
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#include <errno.h>
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#include <ostream>
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#include <fstream>
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#include <sstream>
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// Profiler
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#include "PlatformMacros.h"
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#include "GeckoProfiler.h"
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#include "platform.h"
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#include "nsXULAppAPI.h"
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#include "nsThreadUtils.h"
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#include "prenv.h"
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#include "shared-libraries.h"
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#include "mozilla/StackWalk.h"
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#include "ProfileEntry.h"
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#include "SyncProfile.h"
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#include "SaveProfileTask.h"
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#include "UnwinderThread2.h"
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#include "TableTicker.h"
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// Meta
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#include "nsXPCOM.h"
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#include "nsXPCOMCID.h"
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#include "nsIHttpProtocolHandler.h"
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#include "nsServiceManagerUtils.h"
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#include "nsIXULRuntime.h"
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#include "nsIXULAppInfo.h"
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#include "nsDirectoryServiceUtils.h"
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#include "nsDirectoryServiceDefs.h"
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#include "nsIObserverService.h"
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#include "mozilla/Services.h"
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// JS
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#include "js/OldDebugAPI.h"
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// This file's exports are listed in GeckoProfilerImpl.h.
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/* These will be set to something sensible before we take the first
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sample. */
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UnwMode sUnwindMode = UnwINVALID;
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int sUnwindInterval = 0;
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int sUnwindStackScan = 0;
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int sProfileEntries = 0;
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using std::string;
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using namespace mozilla;
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#if _MSC_VER
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#define snprintf _snprintf
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#endif
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////////////////////////////////////////////////////////////////////////
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// BEGIN take samples.
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// Everything in this section RUNS IN SIGHANDLER CONTEXT
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// RUNS IN SIGHANDLER CONTEXT
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static
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void genProfileEntry(/*MODIFIED*/UnwinderThreadBuffer* utb,
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volatile StackEntry &entry,
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PseudoStack *stack, void *lastpc)
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{
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int lineno = -1;
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// Add a pseudostack-entry start label
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utb__addEntry( utb, ProfileEntry('h', 'P') );
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// And the SP value, if it is non-zero
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if (entry.stackAddress() != 0) {
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utb__addEntry( utb, ProfileEntry('S', entry.stackAddress()) );
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}
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// First entry has tagName 's' (start)
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// Check for magic pointer bit 1 to indicate copy
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const char* sampleLabel = entry.label();
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if (entry.isCopyLabel()) {
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// Store the string using 1 or more 'd' (dynamic) tags
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// that will happen to the preceding tag
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utb__addEntry( utb, ProfileEntry('c', "") );
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// Add one to store the null termination
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size_t strLen = strlen(sampleLabel) + 1;
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for (size_t j = 0; j < strLen;) {
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// Store as many characters in the void* as the platform allows
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char text[sizeof(void*)];
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for (size_t pos = 0; pos < sizeof(void*) && j+pos < strLen; pos++) {
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text[pos] = sampleLabel[j+pos];
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}
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j += sizeof(void*)/sizeof(char);
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// Cast to *((void**) to pass the text data to a void*
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utb__addEntry( utb, ProfileEntry('d', *((void**)(&text[0]))) );
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}
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if (entry.js()) {
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if (!entry.pc()) {
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// The JIT only allows the top-most entry to have a nullptr pc
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MOZ_ASSERT(&entry == &stack->mStack[stack->stackSize() - 1]);
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// If stack-walking was disabled, then that's just unfortunate
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if (lastpc) {
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jsbytecode *jspc = js::ProfilingGetPC(stack->mRuntime, entry.script(),
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lastpc);
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if (jspc) {
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lineno = JS_PCToLineNumber(nullptr, entry.script(), jspc);
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}
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}
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} else {
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lineno = JS_PCToLineNumber(nullptr, entry.script(), entry.pc());
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}
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} else {
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lineno = entry.line();
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}
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} else {
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utb__addEntry( utb, ProfileEntry('c', sampleLabel) );
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lineno = entry.line();
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}
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if (lineno != -1) {
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utb__addEntry( utb, ProfileEntry('n', lineno) );
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}
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// Add a pseudostack-entry end label
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utb__addEntry( utb, ProfileEntry('h', 'Q') );
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}
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// RUNS IN SIGHANDLER CONTEXT
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// Generate pseudo-backtrace entries and put them in |utb|, with
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// the order outermost frame first.
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void genPseudoBacktraceEntries(/*MODIFIED*/UnwinderThreadBuffer* utb,
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PseudoStack *aStack, TickSample *sample)
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{
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// Call genProfileEntry to generate tags for each profile
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// entry. Each entry will be bounded by a 'h' 'P' tag to
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// mark the start and a 'h' 'Q' tag to mark the end.
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uint32_t nInStack = aStack->stackSize();
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for (uint32_t i = 0; i < nInStack; i++) {
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genProfileEntry(utb, aStack->mStack[i], aStack, nullptr);
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}
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# ifdef ENABLE_SPS_LEAF_DATA
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if (sample) {
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utb__addEntry( utb, ProfileEntry('l', (void*)sample->pc) );
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# ifdef ENABLE_ARM_LR_SAVING
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utb__addEntry( utb, ProfileEntry('L', (void*)sample->lr) );
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# endif
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}
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# endif
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}
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// RUNS IN SIGHANDLER CONTEXT
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static
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void populateBuffer(UnwinderThreadBuffer* utb, TickSample* sample,
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UTB_RELEASE_FUNC releaseFunction, bool jankOnly)
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{
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ThreadProfile& sampledThreadProfile = *sample->threadProfile;
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PseudoStack* stack = sampledThreadProfile.GetPseudoStack();
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/* Manufacture the ProfileEntries that we will give to the unwinder
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thread, and park them in |utb|. */
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bool recordSample = true;
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/* Don't process the PeudoStack's markers or honour jankOnly if we're
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immediately sampling the current thread. */
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if (!sample->isSamplingCurrentThread) {
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// LinkedUWTBuffers before markers
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UWTBufferLinkedList* syncBufs = stack->getLinkedUWTBuffers();
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while (syncBufs && syncBufs->peek()) {
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LinkedUWTBuffer* syncBuf = syncBufs->popHead();
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utb__addEntry(utb, ProfileEntry('B', syncBuf->GetBuffer()));
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}
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// Marker(s) come before the sample
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ProfilerMarkerLinkedList* pendingMarkersList = stack->getPendingMarkers();
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while (pendingMarkersList && pendingMarkersList->peek()) {
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ProfilerMarker* marker = pendingMarkersList->popHead();
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stack->addStoredMarker(marker);
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utb__addEntry( utb, ProfileEntry('m', marker) );
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}
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stack->updateGeneration(sampledThreadProfile.GetGenerationID());
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if (jankOnly) {
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// if we are on a different event we can discard any temporary samples
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// we've kept around
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if (sLastSampledEventGeneration != sCurrentEventGeneration) {
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// XXX: we also probably want to add an entry to the profile to help
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// distinguish which samples are part of the same event. That, or record
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// the event generation in each sample
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sampledThreadProfile.erase();
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}
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sLastSampledEventGeneration = sCurrentEventGeneration;
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recordSample = false;
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// only record the events when we have a we haven't seen a tracer
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// event for 100ms
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if (!sLastTracerEvent.IsNull()) {
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TimeDuration delta = sample->timestamp - sLastTracerEvent;
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if (delta.ToMilliseconds() > 100.0) {
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recordSample = true;
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}
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}
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}
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}
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// JRS 2012-Sept-27: this logic used to involve mUseStackWalk.
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// That should be reinstated, but for the moment, use the
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// settings in sUnwindMode and sUnwindInterval.
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// Add a native-backtrace request, or add pseudo backtrace entries,
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// or both.
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switch (sUnwindMode) {
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case UnwNATIVE: /* Native only */
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// add a "do native stack trace now" hint. This will be actioned
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// by the unwinder thread as it processes the entries in this
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// sample.
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utb__addEntry( utb, ProfileEntry('h'/*hint*/, 'N'/*native-trace*/) );
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break;
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case UnwPSEUDO: /* Pseudo only */
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/* Add into |utb|, the pseudo backtrace entries */
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genPseudoBacktraceEntries(utb, stack, sample);
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break;
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case UnwCOMBINED: /* Both Native and Pseudo */
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utb__addEntry( utb, ProfileEntry('h'/*hint*/, 'N'/*native-trace*/) );
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genPseudoBacktraceEntries(utb, stack, sample);
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break;
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case UnwINVALID:
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default:
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MOZ_CRASH();
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}
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if (recordSample) {
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// add a "flush now" hint
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utb__addEntry( utb, ProfileEntry('h'/*hint*/, 'F'/*flush*/) );
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}
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// Add any extras
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if (!sLastTracerEvent.IsNull() && sample) {
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TimeDuration delta = sample->timestamp - sLastTracerEvent;
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utb__addEntry( utb, ProfileEntry('r', static_cast<float>(delta.ToMilliseconds())) );
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}
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if (sample) {
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TimeDuration delta = sample->timestamp - sStartTime;
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utb__addEntry( utb, ProfileEntry('t', static_cast<float>(delta.ToMilliseconds())) );
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}
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if (sLastFrameNumber != sFrameNumber) {
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utb__addEntry( utb, ProfileEntry('f', sFrameNumber) );
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sLastFrameNumber = sFrameNumber;
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}
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/* So now we have, in |utb|, the complete set of entries we want to
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push into the circular buffer. This may also include a 'h' 'F'
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entry, which is "flush now" hint, and/or a 'h' 'N' entry, which
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is a "generate a native backtrace and add it to the buffer right
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now" hint. Hand them off to the helper thread, together with
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stack and register context needed to do a native unwind, if that
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is currently enabled. */
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/* If a native unwind has been requested, we'll start it off using
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the context obtained from the signal handler, to avoid the
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problem of having to unwind through the signal frame itself. */
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/* On Linux and Android, the initial register state is in the
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supplied sample->context. But on MacOS it's not, so we have to
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fake it up here (sigh). */
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if (sUnwindMode == UnwNATIVE || sUnwindMode == UnwCOMBINED) {
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# if defined(SPS_PLAT_amd64_linux) || defined(SPS_PLAT_arm_android) \
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|| defined(SPS_PLAT_x86_linux) || defined(SPS_PLAT_x86_android)
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void* ucV = (void*)sample->context;
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# elif defined(SPS_PLAT_amd64_darwin)
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struct __darwin_mcontext64 mc;
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memset(&mc, 0, sizeof(mc));
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ucontext_t uc;
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memset(&uc, 0, sizeof(uc));
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uc.uc_mcontext = &mc;
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mc.__ss.__rip = (uint64_t)sample->pc;
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mc.__ss.__rsp = (uint64_t)sample->sp;
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mc.__ss.__rbp = (uint64_t)sample->fp;
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void* ucV = (void*)&uc;
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# elif defined(SPS_PLAT_x86_darwin)
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struct __darwin_mcontext32 mc;
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memset(&mc, 0, sizeof(mc));
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ucontext_t uc;
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memset(&uc, 0, sizeof(uc));
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uc.uc_mcontext = &mc;
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mc.__ss.__eip = (uint32_t)sample->pc;
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mc.__ss.__esp = (uint32_t)sample->sp;
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mc.__ss.__ebp = (uint32_t)sample->fp;
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void* ucV = (void*)&uc;
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# elif defined(SPS_OS_windows)
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/* Totally fake this up so it at least builds. No idea if we can
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even ever get here on Windows. */
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void* ucV = nullptr;
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# else
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# error "Unsupported platform"
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# endif
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releaseFunction(&sampledThreadProfile, utb, ucV);
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} else {
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releaseFunction(&sampledThreadProfile, utb, nullptr);
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}
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}
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static
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void sampleCurrent(TickSample* sample)
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{
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// This variant requires sample->threadProfile to be set
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MOZ_ASSERT(sample->threadProfile);
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LinkedUWTBuffer* syncBuf = utb__acquire_sync_buffer(tlsStackTop.get());
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if (!syncBuf) {
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return;
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}
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SyncProfile* syncProfile = sample->threadProfile->AsSyncProfile();
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MOZ_ASSERT(syncProfile);
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if (!syncProfile->SetUWTBuffer(syncBuf)) {
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utb__release_sync_buffer(syncBuf);
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return;
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}
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UnwinderThreadBuffer* utb = syncBuf->GetBuffer();
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populateBuffer(utb, sample, &utb__finish_sync_buffer, false);
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}
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// RUNS IN SIGHANDLER CONTEXT
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void TableTicker::UnwinderTick(TickSample* sample)
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{
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if (sample->isSamplingCurrentThread) {
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sampleCurrent(sample);
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return;
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}
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if (!sample->threadProfile) {
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// Platform doesn't support multithread, so use the main thread profile we created
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sample->threadProfile = GetPrimaryThreadProfile();
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}
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/* Get hold of an empty inter-thread buffer into which to park
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the ProfileEntries for this sample. */
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UnwinderThreadBuffer* utb = uwt__acquire_empty_buffer();
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/* This could fail, if no buffers are currently available, in which
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case we must give up right away. We cannot wait for a buffer to
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become available, as that risks deadlock. */
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if (!utb)
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return;
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populateBuffer(utb, sample, &uwt__release_full_buffer, mJankOnly);
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}
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// END take samples
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////////////////////////////////////////////////////////////////////////
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