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59b924c116
gecko/dom/workers/RuntimeService.cpp
Bobby Holley 59b924c116 Bug 899367 - Only use JSOPTION_UNROOTED_GLOBAL for DOM JSContexts. r=mccr8 
We don't cycle collect any other kind, so there's no difference between marking
them gray and letting the JS engine mark them black. This also gets rid of that
nasty code which reset the flag, which billm theorizes has to do with faulty
logic in ContextHolder when creating ephemeral sandbox cxes. The assertion in
this patch should catch us if anything goes wrong.
2013-09-04 14:06:54 -07:00

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/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* 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 "RuntimeService.h"
#include "nsIContentSecurityPolicy.h"
#include "nsIDOMChromeWindow.h"
#include "nsIEffectiveTLDService.h"
#include "nsIObserverService.h"
#include "nsIPlatformCharset.h"
#include "nsIPrincipal.h"
#include "nsIScriptSecurityManager.h"
#include "nsISupportsPriority.h"
#include "nsITimer.h"
#include "nsPIDOMWindow.h"
#include <algorithm>
#include "GeckoProfiler.h"
#include "js/OldDebugAPI.h"
#include "jsfriendapi.h"
#include "mozilla/CycleCollectedJSRuntime.h"
#include "mozilla/dom/AtomList.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/EventTargetBinding.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/Preferences.h"
#include "mozilla/Util.h"
#include <Navigator.h>
#include "nsContentUtils.h"
#include "nsCycleCollector.h"
#include "nsDOMJSUtils.h"
#include "nsLayoutStatics.h"
#include "nsNetUtil.h"
#include "nsServiceManagerUtils.h"
#include "nsThreadUtils.h"
#include "nsXPCOM.h"
#include "nsXPCOMPrivate.h"
#include "OSFileConstants.h"
#include "xpcpublic.h"
#include "Events.h"
#include "Worker.h"
#include "WorkerPrivate.h"
using namespace mozilla;
using namespace mozilla::dom;
USING_WORKERS_NAMESPACE
using mozilla::MutexAutoLock;
using mozilla::MutexAutoUnlock;
using mozilla::Preferences;
// The size of the worker runtime heaps in bytes. May be changed via pref.
#define WORKER_DEFAULT_RUNTIME_HEAPSIZE 32 * 1024 * 1024
// The size of the worker JS allocation threshold in MB. May be changed via pref.
#define WORKER_DEFAULT_ALLOCATION_THRESHOLD 30
// The C stack size. We use the same stack size on all platforms for
// consistency.
#define WORKER_STACK_SIZE 256 * sizeof(size_t) * 1024
// Half the size of the actual C stack, to be safe.
#define WORKER_CONTEXT_NATIVE_STACK_LIMIT 128 * sizeof(size_t) * 1024
// The maximum number of threads to use for workers, overridable via pref.
#define MAX_WORKERS_PER_DOMAIN 10
static_assert(MAX_WORKERS_PER_DOMAIN >= 1,
"We should allow at least one worker per domain.");
// The default number of seconds that close handlers will be allowed to run for
// content workers.
#define MAX_SCRIPT_RUN_TIME_SEC 10
// The number of seconds that idle threads can hang around before being killed.
#define IDLE_THREAD_TIMEOUT_SEC 30
// The maximum number of threads that can be idle at one time.
#define MAX_IDLE_THREADS 20
#define PREF_WORKERS_PREFIX "dom.workers."
#define PREF_WORKERS_ENABLED PREF_WORKERS_PREFIX "enabled"
#define PREF_WORKERS_MAX_PER_DOMAIN PREF_WORKERS_PREFIX "maxPerDomain"
#define PREF_MAX_SCRIPT_RUN_TIME_CONTENT "dom.max_script_run_time"
#define PREF_MAX_SCRIPT_RUN_TIME_CHROME "dom.max_chrome_script_run_time"
#define GC_REQUEST_OBSERVER_TOPIC "child-gc-request"
#define MEMORY_PRESSURE_OBSERVER_TOPIC "memory-pressure"
#define BROADCAST_ALL_WORKERS(_func, ...) \
PR_BEGIN_MACRO \
AssertIsOnMainThread(); \
\
nsAutoTArray<WorkerPrivate*, 100> workers; \
{ \
MutexAutoLock lock(mMutex); \
\
mDomainMap.EnumerateRead(AddAllTopLevelWorkersToArray, &workers); \
} \
\
if (!workers.IsEmpty()) { \
AutoSafeJSContext cx; \
JSAutoRequest ar(cx); \
for (uint32_t index = 0; index < workers.Length(); index++) { \
workers[index]-> _func (cx, __VA_ARGS__); \
} \
} \
PR_END_MACRO
// Prefixes for observing preference changes.
#define PREF_JS_OPTIONS_PREFIX "javascript.options."
#define PREF_WORKERS_OPTIONS_PREFIX PREF_WORKERS_PREFIX "options."
#define PREF_MEM_OPTIONS_PREFIX "mem."
#define PREF_JIT_HARDENING "jit_hardening"
#define PREF_GCZEAL "gcZeal"
namespace {
const uint32_t kNoIndex = uint32_t(-1);
const uint32_t kRequiredJSContextOptions =
JSOPTION_DONT_REPORT_UNCAUGHT | JSOPTION_NO_SCRIPT_RVAL;
uint32_t gMaxWorkersPerDomain = MAX_WORKERS_PER_DOMAIN;
// Does not hold an owning reference.
RuntimeService* gRuntimeService = nullptr;
// Only non-null during the call to Init.
RuntimeService* gRuntimeServiceDuringInit = nullptr;
enum {
ID_Worker = 0,
ID_ChromeWorker,
ID_Event,
ID_MessageEvent,
ID_ErrorEvent,
ID_COUNT
};
// These are jsids for the main runtime. Only touched on the main thread.
jsid gStringIDs[ID_COUNT] = { JSID_VOID };
const char* gStringChars[] = {
"Worker",
"ChromeWorker",
"WorkerEvent",
"WorkerMessageEvent",
"WorkerErrorEvent"
// XXX Don't care about ProgressEvent since it should never leak to the main
// thread.
};
static_assert(NS_ARRAY_LENGTH(gStringChars) == ID_COUNT,
"gStringChars should have the right length.");
class LiteralRebindingCString : public nsDependentCString
{
public:
template<int N>
void RebindLiteral(const char (&aStr)[N])
{
Rebind(aStr, N-1);
}
};
template <typename T>
struct PrefTraits;
template <>
struct PrefTraits<bool>
{
typedef bool PrefValueType;
static const PrefValueType kDefaultValue = false;
static inline PrefValueType
Get(const char* aPref)
{
AssertIsOnMainThread();
return Preferences::GetBool(aPref);
}
static inline bool
Exists(const char* aPref)
{
AssertIsOnMainThread();
return Preferences::GetType(aPref) == nsIPrefBranch::PREF_BOOL;
}
};
template <>
struct PrefTraits<int32_t>
{
typedef int32_t PrefValueType;
static const PrefValueType kDefaultValue = 0;
static inline PrefValueType
Get(const char* aPref)
{
AssertIsOnMainThread();
return Preferences::GetInt(aPref);
}
static inline bool
Exists(const char* aPref)
{
AssertIsOnMainThread();
return Preferences::GetType(aPref) == nsIPrefBranch::PREF_INT;
}
};
template <typename T>
T
GetWorkerPref(const nsACString& aPref,
const T aDefault = PrefTraits<T>::kDefaultValue)
{
AssertIsOnMainThread();
typedef PrefTraits<T> PrefHelper;
T result;
nsAutoCString prefName;
prefName.AssignLiteral(PREF_WORKERS_OPTIONS_PREFIX);
prefName.Append(aPref);
if (PrefHelper::Exists(prefName.get())) {
result = PrefHelper::Get(prefName.get());
}
else {
prefName.AssignLiteral(PREF_JS_OPTIONS_PREFIX);
prefName.Append(aPref);
if (PrefHelper::Exists(prefName.get())) {
result = PrefHelper::Get(prefName.get());
}
else {
result = aDefault;
}
}
return result;
}
int
LoadJSContextOptions(const char* aPrefName, void* /* aClosure */)
{
AssertIsOnMainThread();
RuntimeService* rts = RuntimeService::GetService();
if (!rts && !gRuntimeServiceDuringInit) {
// May be shutting down, just bail.
return 0;
}
const nsDependentCString prefName(aPrefName);
// Several other pref branches will get included here so bail out if there is
// another callback that will handle this change.
if (StringBeginsWith(prefName,
NS_LITERAL_CSTRING(PREF_JS_OPTIONS_PREFIX
PREF_MEM_OPTIONS_PREFIX)) ||
StringBeginsWith(prefName,
NS_LITERAL_CSTRING(PREF_WORKERS_OPTIONS_PREFIX
PREF_MEM_OPTIONS_PREFIX)) ||
prefName.EqualsLiteral(PREF_JS_OPTIONS_PREFIX PREF_JIT_HARDENING) ||
prefName.EqualsLiteral(PREF_WORKERS_OPTIONS_PREFIX PREF_JIT_HARDENING)) {
return 0;
}
#ifdef JS_GC_ZEAL
if (prefName.EqualsLiteral(PREF_JS_OPTIONS_PREFIX PREF_GCZEAL) ||
prefName.EqualsLiteral(PREF_WORKERS_OPTIONS_PREFIX PREF_GCZEAL)) {
return 0;
}
#endif
// Common options.
uint32_t commonOptions = kRequiredJSContextOptions;
if (GetWorkerPref<bool>(NS_LITERAL_CSTRING("strict"))) {
commonOptions |= JSOPTION_EXTRA_WARNINGS;
}
if (GetWorkerPref<bool>(NS_LITERAL_CSTRING("werror"))) {
commonOptions |= JSOPTION_WERROR;
}
if (GetWorkerPref<bool>(NS_LITERAL_CSTRING("asmjs"))) {
commonOptions |= JSOPTION_ASMJS;
}
// Content options.
uint32_t contentOptions = commonOptions;
if (GetWorkerPref<bool>(NS_LITERAL_CSTRING("baselinejit.content"))) {
contentOptions |= JSOPTION_BASELINE;
}
if (GetWorkerPref<bool>(NS_LITERAL_CSTRING("ion.content"))) {
contentOptions |= JSOPTION_ION;
}
if (GetWorkerPref<bool>(NS_LITERAL_CSTRING("typeinference.content"))) {
contentOptions |= JSOPTION_TYPE_INFERENCE;
}
// Chrome options.
uint32_t chromeOptions = commonOptions;
if (GetWorkerPref<bool>(NS_LITERAL_CSTRING("baselinejit.chrome"))) {
chromeOptions |= JSOPTION_BASELINE;
}
if (GetWorkerPref<bool>(NS_LITERAL_CSTRING("ion.chrome"))) {
chromeOptions |= JSOPTION_ION;
}
if (GetWorkerPref<bool>(NS_LITERAL_CSTRING("typeinference.chrome"))) {
chromeOptions |= JSOPTION_TYPE_INFERENCE;
}
#ifdef DEBUG
if (GetWorkerPref<bool>(NS_LITERAL_CSTRING("strict.debug"))) {
chromeOptions |= JSOPTION_EXTRA_WARNINGS;
}
#endif
RuntimeService::SetDefaultJSContextOptions(contentOptions, chromeOptions);
if (rts) {
rts->UpdateAllWorkerJSContextOptions();
}
return 0;
}
#ifdef JS_GC_ZEAL
int
LoadGCZealOptions(const char* /* aPrefName */, void* /* aClosure */)
{
AssertIsOnMainThread();
RuntimeService* rts = RuntimeService::GetService();
if (!rts && !gRuntimeServiceDuringInit) {
// May be shutting down, just bail.
return 0;
}
int32_t gczeal = GetWorkerPref<int32_t>(NS_LITERAL_CSTRING(PREF_GCZEAL), -1);
if (gczeal < 0) {
gczeal = 0;
}
int32_t frequency =
GetWorkerPref<int32_t>(NS_LITERAL_CSTRING("gcZeal.frequency"), -1);
if (frequency < 0) {
frequency = JS_DEFAULT_ZEAL_FREQ;
}
RuntimeService::SetDefaultGCZeal(uint8_t(gczeal), uint32_t(frequency));
if (rts) {
rts->UpdateAllWorkerGCZeal();
}
return 0;
}
#endif
void
UpdateCommonJSGCMemoryOption(RuntimeService* aRuntimeService,
const nsACString& aPrefName, JSGCParamKey aKey)
{
AssertIsOnMainThread();
NS_ASSERTION(!aPrefName.IsEmpty(), "Empty pref name!");
int32_t prefValue = GetWorkerPref(aPrefName, -1);
uint32_t value =
(prefValue < 0 || prefValue >= 10000) ? 0 : uint32_t(prefValue);
RuntimeService::SetDefaultJSGCSettings(aKey, value);
if (aRuntimeService) {
aRuntimeService->UpdateAllWorkerMemoryParameter(aKey, value);
}
}
void
UpdatOtherJSGCMemoryOption(RuntimeService* aRuntimeService,
JSGCParamKey aKey, uint32_t aValue)
{
AssertIsOnMainThread();
RuntimeService::SetDefaultJSGCSettings(aKey, aValue);
if (aRuntimeService) {
aRuntimeService->UpdateAllWorkerMemoryParameter(aKey, aValue);
}
}
int
LoadJSGCMemoryOptions(const char* aPrefName, void* /* aClosure */)
{
AssertIsOnMainThread();
RuntimeService* rts = RuntimeService::GetService();
if (!rts && !gRuntimeServiceDuringInit) {
// May be shutting down, just bail.
return 0;
}
NS_NAMED_LITERAL_CSTRING(jsPrefix, PREF_JS_OPTIONS_PREFIX);
NS_NAMED_LITERAL_CSTRING(workersPrefix, PREF_WORKERS_OPTIONS_PREFIX);
const nsDependentCString fullPrefName(aPrefName);
// Pull out the string that actually distinguishes the parameter we need to
// change.
nsDependentCSubstring memPrefName;
if (StringBeginsWith(fullPrefName, jsPrefix)) {
memPrefName.Rebind(fullPrefName, jsPrefix.Length());
}
else if (StringBeginsWith(fullPrefName, workersPrefix)) {
memPrefName.Rebind(fullPrefName, workersPrefix.Length());
}
else {
NS_ERROR("Unknown pref name!");
return 0;
}
#ifdef DEBUG
// During Init() we get called back with a branch string here, so there should
// be no just a "mem." pref here.
if (!rts) {
NS_ASSERTION(memPrefName.EqualsLiteral(PREF_MEM_OPTIONS_PREFIX), "Huh?!");
}
#endif
// If we're running in Init() then do this for every pref we care about.
// Otherwise we just want to update the parameter that changed.
for (uint32_t index = rts ? JSSettings::kGCSettingsArraySize - 1 : 0;
index < JSSettings::kGCSettingsArraySize;
index++) {
LiteralRebindingCString matchName;
matchName.RebindLiteral(PREF_MEM_OPTIONS_PREFIX "max");
if (memPrefName == matchName || (!rts && index == 0)) {
int32_t prefValue = GetWorkerPref(matchName, -1);
uint32_t value = (prefValue <= 0 || prefValue >= 0x1000) ?
uint32_t(-1) :
uint32_t(prefValue) * 1024 * 1024;
UpdatOtherJSGCMemoryOption(rts, JSGC_MAX_BYTES, value);
continue;
}
matchName.RebindLiteral(PREF_MEM_OPTIONS_PREFIX "high_water_mark");
if (memPrefName == matchName || (!rts && index == 1)) {
int32_t prefValue = GetWorkerPref(matchName, 128);
UpdatOtherJSGCMemoryOption(rts, JSGC_MAX_MALLOC_BYTES,
uint32_t(prefValue) * 1024 * 1024);
continue;
}
matchName.RebindLiteral(PREF_MEM_OPTIONS_PREFIX
"gc_high_frequency_time_limit_ms");
if (memPrefName == matchName || (!rts && index == 2)) {
UpdateCommonJSGCMemoryOption(rts, matchName,
JSGC_HIGH_FREQUENCY_TIME_LIMIT);
continue;
}
matchName.RebindLiteral(PREF_MEM_OPTIONS_PREFIX
"gc_low_frequency_heap_growth");
if (memPrefName == matchName || (!rts && index == 3)) {
UpdateCommonJSGCMemoryOption(rts, matchName,
JSGC_LOW_FREQUENCY_HEAP_GROWTH);
continue;
}
matchName.RebindLiteral(PREF_MEM_OPTIONS_PREFIX
"gc_high_frequency_heap_growth_min");
if (memPrefName == matchName || (!rts && index == 4)) {
UpdateCommonJSGCMemoryOption(rts, matchName,
JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MIN);
continue;
}
matchName.RebindLiteral(PREF_MEM_OPTIONS_PREFIX
"gc_high_frequency_heap_growth_max");
if (memPrefName == matchName || (!rts && index == 5)) {
UpdateCommonJSGCMemoryOption(rts, matchName,
JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MAX);
continue;
}
matchName.RebindLiteral(PREF_MEM_OPTIONS_PREFIX
"gc_high_frequency_low_limit_mb");
if (memPrefName == matchName || (!rts && index == 6)) {
UpdateCommonJSGCMemoryOption(rts, matchName,
JSGC_HIGH_FREQUENCY_LOW_LIMIT);
continue;
}
matchName.RebindLiteral(PREF_MEM_OPTIONS_PREFIX
"gc_high_frequency_high_limit_mb");
if (memPrefName == matchName || (!rts && index == 7)) {
UpdateCommonJSGCMemoryOption(rts, matchName,
JSGC_HIGH_FREQUENCY_HIGH_LIMIT);
continue;
}
matchName.RebindLiteral(PREF_MEM_OPTIONS_PREFIX
"gc_allocation_threshold_mb");
if (memPrefName == matchName || (!rts && index == 8)) {
UpdateCommonJSGCMemoryOption(rts, matchName, JSGC_ALLOCATION_THRESHOLD);
continue;
}
matchName.RebindLiteral(PREF_MEM_OPTIONS_PREFIX "gc_incremental_slice_ms");
if (memPrefName == matchName || (!rts && index == 9)) {
int32_t prefValue = GetWorkerPref(matchName, -1);
uint32_t value =
(prefValue <= 0 || prefValue >= 100000) ? 0 : uint32_t(prefValue);
UpdatOtherJSGCMemoryOption(rts, JSGC_SLICE_TIME_BUDGET, value);
continue;
}
matchName.RebindLiteral(PREF_MEM_OPTIONS_PREFIX "gc_dynamic_heap_growth");
if (memPrefName == matchName || (!rts && index == 10)) {
bool prefValue = GetWorkerPref(matchName, false);
UpdatOtherJSGCMemoryOption(rts, JSGC_DYNAMIC_HEAP_GROWTH,
prefValue ? 0 : 1);
continue;
}
matchName.RebindLiteral(PREF_MEM_OPTIONS_PREFIX "gc_dynamic_mark_slice");
if (memPrefName == matchName || (!rts && index == 11)) {
bool prefValue = GetWorkerPref(matchName, false);
UpdatOtherJSGCMemoryOption(rts, JSGC_DYNAMIC_MARK_SLICE,
prefValue ? 0 : 1);
continue;
}
#ifdef DEBUG
nsAutoCString message("Workers don't support the 'mem.");
message.Append(memPrefName);
message.AppendLiteral("' preference!");
NS_WARNING(message.get());
#endif
}
return 0;
}
int
LoadJITHardeningOption(const char* /* aPrefName */, void* /* aClosure */)
{
AssertIsOnMainThread();
RuntimeService* rts = RuntimeService::GetService();
if (!rts && !gRuntimeServiceDuringInit) {
// May be shutting down, just bail.
return 0;
}
bool value = GetWorkerPref(NS_LITERAL_CSTRING(PREF_JIT_HARDENING), false);
RuntimeService::SetDefaultJITHardening(value);
if (rts) {
rts->UpdateAllWorkerJITHardening(value);
}
return 0;
}
void
ErrorReporter(JSContext* aCx, const char* aMessage, JSErrorReport* aReport)
{
WorkerPrivate* worker = GetWorkerPrivateFromContext(aCx);
return worker->ReportError(aCx, aMessage, aReport);
}
bool
OperationCallback(JSContext* aCx)
{
WorkerPrivate* worker = GetWorkerPrivateFromContext(aCx);
// Now is a good time to turn on profiling if it's pending.
profiler_js_operation_callback();
return worker->OperationCallback(aCx);
}
class LogViolationDetailsRunnable : public nsRunnable
{
WorkerPrivate* mWorkerPrivate;
nsString mFileName;
uint32_t mLineNum;
uint32_t mSyncQueueKey;
private:
class LogViolationDetailsResponseRunnable : public WorkerSyncRunnable
{
uint32_t mSyncQueueKey;
public:
LogViolationDetailsResponseRunnable(WorkerPrivate* aWorkerPrivate,
uint32_t aSyncQueueKey)
: WorkerSyncRunnable(aWorkerPrivate, aSyncQueueKey, false),
mSyncQueueKey(aSyncQueueKey)
{
NS_ASSERTION(aWorkerPrivate, "Don't hand me a null WorkerPrivate!");
}
bool
WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate)
{
aWorkerPrivate->StopSyncLoop(mSyncQueueKey, true);
return true;
}
bool
PreDispatch(JSContext* aCx, WorkerPrivate* aWorkerPrivate)
{
AssertIsOnMainThread();
return true;
}
void
PostDispatch(JSContext* aCx, WorkerPrivate* aWorkerPrivate,
bool aDispatchResult)
{
AssertIsOnMainThread();
}
};
public:
LogViolationDetailsRunnable(WorkerPrivate* aWorker,
const nsString& aFileName,
uint32_t aLineNum)
: mWorkerPrivate(aWorker),
mFileName(aFileName),
mLineNum(aLineNum),
mSyncQueueKey(0)
{
NS_ASSERTION(aWorker, "WorkerPrivate cannot be null");
}
bool
Dispatch(JSContext* aCx)
{
AutoSyncLoopHolder syncLoop(mWorkerPrivate);
mSyncQueueKey = syncLoop.SyncQueueKey();
if (NS_FAILED(NS_DispatchToMainThread(this, NS_DISPATCH_NORMAL))) {
JS_ReportError(aCx, "Failed to dispatch to main thread!");
return false;
}
return syncLoop.RunAndForget(aCx);
}
NS_IMETHOD
Run()
{
AssertIsOnMainThread();
nsIContentSecurityPolicy* csp = mWorkerPrivate->GetCSP();
if (csp) {
NS_NAMED_LITERAL_STRING(scriptSample,
"Call to eval() or related function blocked by CSP.");
csp->LogViolationDetails(nsIContentSecurityPolicy::VIOLATION_TYPE_EVAL,
mFileName, scriptSample, mLineNum);
}
nsRefPtr<LogViolationDetailsResponseRunnable> response =
new LogViolationDetailsResponseRunnable(mWorkerPrivate, mSyncQueueKey);
if (!response->Dispatch(nullptr)) {
NS_WARNING("Failed to dispatch response!");
}
return NS_OK;
}
};
bool
ContentSecurityPolicyAllows(JSContext* aCx)
{
WorkerPrivate* worker = GetWorkerPrivateFromContext(aCx);
worker->AssertIsOnWorkerThread();
if (worker->GetReportCSPViolations()) {
nsString fileName;
uint32_t lineNum = 0;
JSScript* script;
const char* file;
if (JS_DescribeScriptedCaller(aCx, &script, &lineNum) &&
(file = JS_GetScriptFilename(aCx, script))) {
fileName.AssignASCII(file);
} else {
JS_ReportPendingException(aCx);
}
nsRefPtr<LogViolationDetailsRunnable> runnable =
new LogViolationDetailsRunnable(worker, fileName, lineNum);
if (!runnable->Dispatch(aCx)) {
JS_ReportPendingException(aCx);
}
}
return worker->IsEvalAllowed();
}
void
CTypesActivityCallback(JSContext* aCx,
js::CTypesActivityType aType)
{
WorkerPrivate* worker = GetWorkerPrivateFromContext(aCx);
worker->AssertIsOnWorkerThread();
switch (aType) {
case js::CTYPES_CALL_BEGIN:
worker->BeginCTypesCall();
break;
case js::CTYPES_CALL_END:
worker->EndCTypesCall();
break;
case js::CTYPES_CALLBACK_BEGIN:
worker->BeginCTypesCallback();
break;
case js::CTYPES_CALLBACK_END:
worker->EndCTypesCallback();
break;
default:
MOZ_CRASH("Unknown type flag!");
}
}
struct WorkerThreadRuntimePrivate : public PerThreadAtomCache
{
WorkerPrivate* mWorkerPrivate;
};
JSContext*
CreateJSContextForWorker(WorkerPrivate* aWorkerPrivate, JSRuntime* aRuntime)
{
aWorkerPrivate->AssertIsOnWorkerThread();
NS_ASSERTION(!aWorkerPrivate->GetJSContext(), "Already has a context!");
JSSettings settings;
aWorkerPrivate->CopyJSSettings(settings);
NS_ASSERTION((settings.chrome.options & kRequiredJSContextOptions) ==
kRequiredJSContextOptions,
"Somehow we lost our required chrome options!");
NS_ASSERTION((settings.content.options & kRequiredJSContextOptions) ==
kRequiredJSContextOptions,
"Somehow we lost our required content options!");
JSSettings::JSGCSettingsArray& gcSettings = settings.gcSettings;
// This is the real place where we set the max memory for the runtime.
for (uint32_t index = 0; index < ArrayLength(gcSettings); index++) {
const JSSettings::JSGCSetting& setting = gcSettings[index];
if (setting.IsSet()) {
NS_ASSERTION(setting.value, "Can't handle 0 values!");
JS_SetGCParameter(aRuntime, setting.key, setting.value);
}
}
JS_SetNativeStackQuota(aRuntime, WORKER_CONTEXT_NATIVE_STACK_LIMIT);
// Security policy:
static JSSecurityCallbacks securityCallbacks = {
NULL,
ContentSecurityPolicyAllows
};
JS_SetSecurityCallbacks(aRuntime, &securityCallbacks);
// DOM helpers:
static js::DOMCallbacks DOMCallbacks = {
InstanceClassHasProtoAtDepth
};
SetDOMCallbacks(aRuntime, &DOMCallbacks);
JSContext* workerCx = JS_NewContext(aRuntime, 0);
if (!workerCx) {
NS_WARNING("Could not create new context!");
return nullptr;
}
auto rtPrivate = new WorkerThreadRuntimePrivate();
memset(rtPrivate, 0, sizeof(WorkerThreadRuntimePrivate));
rtPrivate->mWorkerPrivate = aWorkerPrivate;
JS_SetRuntimePrivate(aRuntime, rtPrivate);
JS_SetErrorReporter(workerCx, ErrorReporter);
JS_SetOperationCallback(aRuntime, OperationCallback);
js::SetCTypesActivityCallback(aRuntime, CTypesActivityCallback);
JS_SetOptions(workerCx,
aWorkerPrivate->IsChromeWorker() ? settings.chrome.options :
settings.content.options);
JS_SetJitHardening(aRuntime, settings.jitHardening);
#ifdef JS_GC_ZEAL
JS_SetGCZeal(workerCx, settings.gcZeal, settings.gcZealFrequency);
#endif
return workerCx;
}
class WorkerJSRuntime : public mozilla::CycleCollectedJSRuntime
{
public:
// The heap size passed here doesn't matter, we will change it later in the
// call to JS_SetGCParameter inside CreateJSContextForWorker.
WorkerJSRuntime(WorkerPrivate* aWorkerPrivate)
: CycleCollectedJSRuntime(WORKER_DEFAULT_RUNTIME_HEAPSIZE,
JS_NO_HELPER_THREADS),
mWorkerPrivate(aWorkerPrivate)
{
// We need to ensure that a JSContext outlives the cycle collector, and
// that the internal JSContext created by ctypes is not the last JSContext
// to die. So we create an unused JSContext here and destroy it after
// the cycle collector shuts down. Thus all cycles will be broken before
// the last GC and all finalizers will be run.
mLastJSContext = JS_NewContext(Runtime(), 0);
MOZ_ASSERT(mLastJSContext);
}
~WorkerJSRuntime()
{
auto rtPrivate = static_cast<WorkerThreadRuntimePrivate*>(JS_GetRuntimePrivate(Runtime()));
delete rtPrivate;
JS_SetRuntimePrivate(Runtime(), nullptr);
// All JSContexts except mLastJSContext should be destroyed now. The
// worker global will be unrooted and the shutdown cycle collection
// should break all remaining cycles. Destroying mLastJSContext will run
// the GC the final time and finalize any JSObjects that were participating
// in cycles that were broken during CC shutdown.
nsCycleCollector_shutdown();
// The CC is shutdown, and this will GC, so make sure we don't try to CC
// again.
mWorkerPrivate = nullptr;
JS_DestroyContext(mLastJSContext);
mLastJSContext = nullptr;
}
void
DispatchDeferredDeletion(bool aContinuation) MOZ_OVERRIDE
{
MOZ_ASSERT(!aContinuation);
// Do it immediately, no need for asynchronous behavior here.
nsCycleCollector_doDeferredDeletion();
}
virtual void CustomGCCallback(JSGCStatus aStatus) MOZ_OVERRIDE
{
if (!mWorkerPrivate) {
// We're shutting down, no need to do anything.
return;
}
mWorkerPrivate->AssertIsOnWorkerThread();
if (aStatus == JSGC_END) {
nsCycleCollector_collect(true, nullptr, nullptr);
}
}
private:
WorkerPrivate* mWorkerPrivate;
JSContext* mLastJSContext;
};
class WorkerThreadRunnable : public nsRunnable
{
WorkerPrivate* mWorkerPrivate;
public:
WorkerThreadRunnable(WorkerPrivate* aWorkerPrivate)
: mWorkerPrivate(aWorkerPrivate)
{
NS_ASSERTION(mWorkerPrivate, "This should never be null!");
}
NS_IMETHOD
Run()
{
WorkerPrivate* workerPrivate = mWorkerPrivate;
mWorkerPrivate = nullptr;
workerPrivate->AssertIsOnWorkerThread();
{
nsCycleCollector_startup();
WorkerJSRuntime runtime(workerPrivate);
JSRuntime* rt = runtime.Runtime();
JSContext* cx = CreateJSContextForWorker(workerPrivate, rt);
if (!cx) {
// XXX need to fire an error at parent.
NS_ERROR("Failed to create runtime and context!");
return NS_ERROR_FAILURE;
}
char aLocal;
profiler_register_thread("WebWorker", &aLocal);
#ifdef MOZ_ENABLE_PROFILER_SPS
if (PseudoStack* stack = mozilla_get_pseudo_stack())
stack->sampleRuntime(rt);
#endif
{
JSAutoRequest ar(cx);
workerPrivate->DoRunLoop(cx);
}
// Destroy the main context. This will unroot the main worker global and
// GC. This is not the last JSContext (WorkerJSRuntime maintains an
// internal JSContext).
JS_DestroyContext(cx);
// Now WorkerJSRuntime goes out of scope and its destructor will shut
// down the cycle collector and destroy the final JSContext. This
// breaks any remaining cycles and collects the C++ and JS objects
// participating.
}
#ifdef MOZ_ENABLE_PROFILER_SPS
if (PseudoStack* stack = mozilla_get_pseudo_stack())
stack->sampleRuntime(nullptr);
#endif
workerPrivate->ScheduleDeletion(false);
profiler_unregister_thread();
return NS_OK;
}
};
} /* anonymous namespace */
BEGIN_WORKERS_NAMESPACE
// Entry point for the DOM.
bool
ResolveWorkerClasses(JSContext* aCx, JS::Handle<JSObject*> aObj, JS::Handle<jsid> aId,
unsigned aFlags, JS::MutableHandle<JSObject*> aObjp)
{
AssertIsOnMainThread();
// Make sure our strings are interned.
if (JSID_IS_VOID(gStringIDs[0])) {
for (uint32_t i = 0; i < ID_COUNT; i++) {
JSString* str = JS_InternString(aCx, gStringChars[i]);
if (!str) {
while (i) {
gStringIDs[--i] = JSID_VOID;
}
return false;
}
gStringIDs[i] = INTERNED_STRING_TO_JSID(aCx, str);
}
}
bool isChrome = false;
bool shouldResolve = false;
for (uint32_t i = 0; i < ID_COUNT; i++) {
if (gStringIDs[i] == aId) {
isChrome = nsContentUtils::IsCallerChrome();
// Don't resolve if this is ChromeWorker and we're not chrome. Otherwise
// always resolve.
shouldResolve = gStringIDs[ID_ChromeWorker] == aId ? isChrome : true;
break;
}
}
if (shouldResolve) {
// Don't do anything if workers are disabled.
if (!isChrome && !Preferences::GetBool(PREF_WORKERS_ENABLED)) {
aObjp.set(nullptr);
return true;
}
JSObject* eventTarget = EventTargetBinding_workers::GetProtoObject(aCx, aObj);
if (!eventTarget) {
return false;
}
JSObject* worker = worker::InitClass(aCx, aObj, eventTarget, true);
if (!worker) {
return false;
}
if (isChrome && !chromeworker::InitClass(aCx, aObj, worker, true)) {
return false;
}
if (!events::InitClasses(aCx, aObj, true)) {
return false;
}
aObjp.set(aObj);
return true;
}
// Not resolved.
aObjp.set(nullptr);
return true;
}
void
CancelWorkersForWindow(JSContext* aCx, nsPIDOMWindow* aWindow)
{
AssertIsOnMainThread();
RuntimeService* runtime = RuntimeService::GetService();
if (runtime) {
runtime->CancelWorkersForWindow(aCx, aWindow);
}
}
void
SuspendWorkersForWindow(JSContext* aCx, nsPIDOMWindow* aWindow)
{
AssertIsOnMainThread();
RuntimeService* runtime = RuntimeService::GetService();
if (runtime) {
runtime->SuspendWorkersForWindow(aCx, aWindow);
}
}
void
ResumeWorkersForWindow(nsIScriptContext* aCx, nsPIDOMWindow* aWindow)
{
AssertIsOnMainThread();
RuntimeService* runtime = RuntimeService::GetService();
if (runtime) {
runtime->ResumeWorkersForWindow(aCx, aWindow);
}
}
namespace {
class WorkerTaskRunnable : public WorkerRunnable
{
public:
WorkerTaskRunnable(WorkerPrivate* aPrivate, WorkerTask* aTask)
: WorkerRunnable(aPrivate, WorkerThread, UnchangedBusyCount,
SkipWhenClearing),
mTask(aTask)
{ }
virtual bool PreDispatch(JSContext* aCx, WorkerPrivate* aWorkerPrivate) {
return true;
}
virtual void PostDispatch(JSContext* aCx, WorkerPrivate* aWorkerPrivate,
bool aDispatchResult)
{ }
virtual bool WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate);
private:
nsRefPtr<WorkerTask> mTask;
};
bool
WorkerTaskRunnable::WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate)
{
return mTask->RunTask(aCx);
}
}
bool
WorkerCrossThreadDispatcher::PostTask(WorkerTask* aTask)
{
mozilla::MutexAutoLock lock(mMutex);
if (!mPrivate) {
return false;
}
nsRefPtr<WorkerTaskRunnable> runnable = new WorkerTaskRunnable(mPrivate, aTask);
runnable->Dispatch(nullptr);
return true;
}
WorkerPrivate*
GetWorkerPrivateFromContext(JSContext* aCx)
{
NS_ASSERTION(!NS_IsMainThread(), "Wrong thread!");
return static_cast<WorkerThreadRuntimePrivate*>(JS_GetRuntimePrivate(JS_GetRuntime(aCx)))->mWorkerPrivate;
}
bool
IsCurrentThreadRunningChromeWorker()
{
NS_ASSERTION(!NS_IsMainThread(), "Wrong thread!");
CycleCollectedJSRuntime* ccrt = nsCycleCollector_currentJSRuntime();
if (!ccrt) {
return false;
}
JSRuntime* rt = ccrt->Runtime();
return static_cast<WorkerThreadRuntimePrivate*>(JS_GetRuntimePrivate(rt))->
mWorkerPrivate->UsesSystemPrincipal();
}
END_WORKERS_NAMESPACE
// This is only touched on the main thread. Initialized in Init() below.
JSSettings RuntimeService::sDefaultJSSettings;
RuntimeService::RuntimeService()
: mMutex("RuntimeService::mMutex"), mObserved(false),
mShuttingDown(false), mNavigatorStringsLoaded(false)
{
AssertIsOnMainThread();
NS_ASSERTION(!gRuntimeService, "More than one service!");
}
RuntimeService::~RuntimeService()
{
AssertIsOnMainThread();
// gRuntimeService can be null if Init() fails.
NS_ASSERTION(!gRuntimeService || gRuntimeService == this,
"More than one service!");
gRuntimeService = nullptr;
}
// static
RuntimeService*
RuntimeService::GetOrCreateService()
{
AssertIsOnMainThread();
if (!gRuntimeService) {
nsRefPtr<RuntimeService> service = new RuntimeService();
if (NS_FAILED(service->Init())) {
NS_WARNING("Failed to initialize!");
service->Cleanup();
return nullptr;
}
// The observer service now owns us until shutdown.
gRuntimeService = service;
}
return gRuntimeService;
}
// static
RuntimeService*
RuntimeService::GetService()
{
return gRuntimeService;
}
bool
RuntimeService::RegisterWorker(JSContext* aCx, WorkerPrivate* aWorkerPrivate)
{
aWorkerPrivate->AssertIsOnParentThread();
WorkerPrivate* parent = aWorkerPrivate->GetParent();
if (!parent) {
AssertIsOnMainThread();
if (mShuttingDown) {
JS_ReportError(aCx, "Cannot create worker during shutdown!");
return false;
}
}
WorkerDomainInfo* domainInfo;
bool queued = false;
{
const nsCString& domain = aWorkerPrivate->Domain();
MutexAutoLock lock(mMutex);
if (!mDomainMap.Get(domain, &domainInfo)) {
NS_ASSERTION(!parent, "Shouldn't have a parent here!");
domainInfo = new WorkerDomainInfo();
domainInfo->mDomain = domain;
mDomainMap.Put(domain, domainInfo);
}
if (domainInfo) {
queued = gMaxWorkersPerDomain &&
domainInfo->ActiveWorkerCount() >= gMaxWorkersPerDomain &&
!domain.IsEmpty();
if (queued) {
domainInfo->mQueuedWorkers.AppendElement(aWorkerPrivate);
}
else if (parent) {
domainInfo->mChildWorkerCount++;
}
else {
domainInfo->mActiveWorkers.AppendElement(aWorkerPrivate);
}
}
}
if (!domainInfo) {
JS_ReportOutOfMemory(aCx);
return false;
}
// From here on out we must call UnregisterWorker if something fails!
if (parent) {
if (!parent->AddChildWorker(aCx, aWorkerPrivate)) {
UnregisterWorker(aCx, aWorkerPrivate);
return false;
}
}
else {
if (!mNavigatorStringsLoaded) {
NS_GetNavigatorAppName(mNavigatorStrings.mAppName);
if (NS_FAILED(NS_GetNavigatorAppVersion(mNavigatorStrings.mAppVersion)) ||
NS_FAILED(NS_GetNavigatorPlatform(mNavigatorStrings.mPlatform)) ||
NS_FAILED(NS_GetNavigatorUserAgent(mNavigatorStrings.mUserAgent))) {
JS_ReportError(aCx, "Failed to load navigator strings!");
UnregisterWorker(aCx, aWorkerPrivate);
return false;
}
mNavigatorStringsLoaded = true;
}
nsPIDOMWindow* window = aWorkerPrivate->GetWindow();
nsTArray<WorkerPrivate*>* windowArray;
if (!mWindowMap.Get(window, &windowArray)) {
NS_ASSERTION(!parent, "Shouldn't have a parent here!");
windowArray = new nsTArray<WorkerPrivate*>(1);
mWindowMap.Put(window, windowArray);
}
NS_ASSERTION(!windowArray->Contains(aWorkerPrivate),
"Already know about this worker!");
windowArray->AppendElement(aWorkerPrivate);
}
if (!queued && !ScheduleWorker(aCx, aWorkerPrivate)) {
return false;
}
return true;
}
void
RuntimeService::UnregisterWorker(JSContext* aCx, WorkerPrivate* aWorkerPrivate)
{
aWorkerPrivate->AssertIsOnParentThread();
WorkerPrivate* parent = aWorkerPrivate->GetParent();
if (!parent) {
AssertIsOnMainThread();
}
WorkerPrivate* queuedWorker = nullptr;
{
const nsCString& domain = aWorkerPrivate->Domain();
MutexAutoLock lock(mMutex);
WorkerDomainInfo* domainInfo;
if (!mDomainMap.Get(domain, &domainInfo)) {
NS_ERROR("Don't have an entry for this domain!");
}
// Remove old worker from everywhere.
uint32_t index = domainInfo->mQueuedWorkers.IndexOf(aWorkerPrivate);
if (index != kNoIndex) {
// Was queued, remove from the list.
domainInfo->mQueuedWorkers.RemoveElementAt(index);
}
else if (parent) {
NS_ASSERTION(domainInfo->mChildWorkerCount, "Must be non-zero!");
domainInfo->mChildWorkerCount--;
}
else {
NS_ASSERTION(domainInfo->mActiveWorkers.Contains(aWorkerPrivate),
"Don't know about this worker!");
domainInfo->mActiveWorkers.RemoveElement(aWorkerPrivate);
}
// See if there's a queued worker we can schedule.
if (domainInfo->ActiveWorkerCount() < gMaxWorkersPerDomain &&
!domainInfo->mQueuedWorkers.IsEmpty()) {
queuedWorker = domainInfo->mQueuedWorkers[0];
domainInfo->mQueuedWorkers.RemoveElementAt(0);
if (queuedWorker->GetParent()) {
domainInfo->mChildWorkerCount++;
}
else {
domainInfo->mActiveWorkers.AppendElement(queuedWorker);
}
}
if (!domainInfo->ActiveWorkerCount()) {
NS_ASSERTION(domainInfo->mQueuedWorkers.IsEmpty(), "Huh?!");
mDomainMap.Remove(domain);
}
}
if (parent) {
parent->RemoveChildWorker(aCx, aWorkerPrivate);
}
else {
nsPIDOMWindow* window = aWorkerPrivate->GetWindow();
nsTArray<WorkerPrivate*>* windowArray;
if (!mWindowMap.Get(window, &windowArray)) {
NS_ERROR("Don't have an entry for this window!");
}
NS_ASSERTION(windowArray->Contains(aWorkerPrivate),
"Don't know about this worker!");
windowArray->RemoveElement(aWorkerPrivate);
if (windowArray->IsEmpty()) {
NS_ASSERTION(!queuedWorker, "How can this be?!");
mWindowMap.Remove(window);
}
}
if (queuedWorker && !ScheduleWorker(aCx, queuedWorker)) {
UnregisterWorker(aCx, queuedWorker);
}
}
bool
RuntimeService::ScheduleWorker(JSContext* aCx, WorkerPrivate* aWorkerPrivate)
{
if (!aWorkerPrivate->Start()) {
// This is ok, means that we didn't need to make a thread for this worker.
return true;
}
nsCOMPtr<nsIThread> thread;
{
MutexAutoLock lock(mMutex);
if (!mIdleThreadArray.IsEmpty()) {
uint32_t index = mIdleThreadArray.Length() - 1;
mIdleThreadArray[index].mThread.swap(thread);
mIdleThreadArray.RemoveElementAt(index);
}
}
if (!thread) {
if (NS_FAILED(NS_NewNamedThread("DOM Worker",
getter_AddRefs(thread), nullptr,
WORKER_STACK_SIZE))) {
UnregisterWorker(aCx, aWorkerPrivate);
JS_ReportError(aCx, "Could not create new thread!");
return false;
}
}
int32_t priority = aWorkerPrivate->IsChromeWorker() ?
nsISupportsPriority::PRIORITY_NORMAL :
nsISupportsPriority::PRIORITY_LOW;
nsCOMPtr<nsISupportsPriority> threadPriority = do_QueryInterface(thread);
if (!threadPriority || NS_FAILED(threadPriority->SetPriority(priority))) {
NS_WARNING("Could not set the thread's priority!");
}
#ifdef DEBUG
aWorkerPrivate->SetThread(thread);
#endif
nsCOMPtr<nsIRunnable> runnable = new WorkerThreadRunnable(aWorkerPrivate);
if (NS_FAILED(thread->Dispatch(runnable, NS_DISPATCH_NORMAL))) {
UnregisterWorker(aCx, aWorkerPrivate);
JS_ReportError(aCx, "Could not dispatch to thread!");
return false;
}
return true;
}
// static
void
RuntimeService::ShutdownIdleThreads(nsITimer* aTimer, void* /* aClosure */)
{
AssertIsOnMainThread();
RuntimeService* runtime = RuntimeService::GetService();
NS_ASSERTION(runtime, "This should never be null!");
NS_ASSERTION(aTimer == runtime->mIdleThreadTimer, "Wrong timer!");
// Cheat a little and grab all threads that expire within one second of now.
TimeStamp now = TimeStamp::Now() + TimeDuration::FromSeconds(1);
TimeStamp nextExpiration;
nsAutoTArray<nsCOMPtr<nsIThread>, 20> expiredThreads;
{
MutexAutoLock lock(runtime->mMutex);
for (uint32_t index = 0; index < runtime->mIdleThreadArray.Length();
index++) {
IdleThreadInfo& info = runtime->mIdleThreadArray[index];
if (info.mExpirationTime > now) {
nextExpiration = info.mExpirationTime;
break;
}
nsCOMPtr<nsIThread>* thread = expiredThreads.AppendElement();
thread->swap(info.mThread);
}
if (!expiredThreads.IsEmpty()) {
runtime->mIdleThreadArray.RemoveElementsAt(0, expiredThreads.Length());
}
}
NS_ASSERTION(nextExpiration.IsNull() || !expiredThreads.IsEmpty(),
"Should have a new time or there should be some threads to shut "
"down");
for (uint32_t index = 0; index < expiredThreads.Length(); index++) {
if (NS_FAILED(expiredThreads[index]->Shutdown())) {
NS_WARNING("Failed to shutdown thread!");
}
}
if (!nextExpiration.IsNull()) {
TimeDuration delta = nextExpiration - TimeStamp::Now();
uint32_t delay(delta > TimeDuration(0) ? delta.ToMilliseconds() : 0);
// Reschedule the timer.
if (NS_FAILED(aTimer->InitWithFuncCallback(ShutdownIdleThreads, nullptr,
delay,
nsITimer::TYPE_ONE_SHOT))) {
NS_ERROR("Can't schedule timer!");
}
}
}
nsresult
RuntimeService::Init()
{
AssertIsOnMainThread();
nsLayoutStatics::AddRef();
// Initialize JSSettings.
if (!sDefaultJSSettings.gcSettings[0].IsSet()) {
sDefaultJSSettings.chrome.options = kRequiredJSContextOptions;
sDefaultJSSettings.chrome.maxScriptRuntime = -1;
sDefaultJSSettings.content.options = kRequiredJSContextOptions;
sDefaultJSSettings.content.maxScriptRuntime = MAX_SCRIPT_RUN_TIME_SEC;
#ifdef JS_GC_ZEAL
sDefaultJSSettings.gcZealFrequency = JS_DEFAULT_ZEAL_FREQ;
sDefaultJSSettings.gcZeal = 0;
#endif
SetDefaultJSGCSettings(JSGC_MAX_BYTES, WORKER_DEFAULT_RUNTIME_HEAPSIZE);
SetDefaultJSGCSettings(JSGC_ALLOCATION_THRESHOLD,
WORKER_DEFAULT_ALLOCATION_THRESHOLD);
}
mIdleThreadTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
NS_ENSURE_STATE(mIdleThreadTimer);
mDomainMap.Init();
mWindowMap.Init();
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
NS_ENSURE_TRUE(obs, NS_ERROR_FAILURE);
nsresult rv =
obs->AddObserver(this, NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID, false);
NS_ENSURE_SUCCESS(rv, rv);
mObserved = true;
if (NS_FAILED(obs->AddObserver(this, GC_REQUEST_OBSERVER_TOPIC, false))) {
NS_WARNING("Failed to register for GC request notifications!");
}
if (NS_FAILED(obs->AddObserver(this, MEMORY_PRESSURE_OBSERVER_TOPIC,
false))) {
NS_WARNING("Failed to register for memory pressure notifications!");
}
NS_ASSERTION(!gRuntimeServiceDuringInit, "This should be null!");
gRuntimeServiceDuringInit = this;
if (NS_FAILED(Preferences::RegisterCallback(
LoadJSGCMemoryOptions,
PREF_JS_OPTIONS_PREFIX PREF_MEM_OPTIONS_PREFIX,
nullptr)) ||
NS_FAILED(Preferences::RegisterCallbackAndCall(
LoadJSGCMemoryOptions,
PREF_WORKERS_OPTIONS_PREFIX PREF_MEM_OPTIONS_PREFIX,
nullptr)) ||
NS_FAILED(Preferences::RegisterCallback(
LoadJITHardeningOption,
PREF_JS_OPTIONS_PREFIX PREF_JIT_HARDENING,
nullptr)) ||
NS_FAILED(Preferences::RegisterCallbackAndCall(
LoadJITHardeningOption,
PREF_WORKERS_OPTIONS_PREFIX PREF_JIT_HARDENING,
nullptr)) ||
#ifdef JS_GC_ZEAL
NS_FAILED(Preferences::RegisterCallback(
LoadGCZealOptions,
PREF_JS_OPTIONS_PREFIX PREF_GCZEAL,
nullptr)) ||
NS_FAILED(Preferences::RegisterCallbackAndCall(
LoadGCZealOptions,
PREF_WORKERS_OPTIONS_PREFIX PREF_GCZEAL,
nullptr)) ||
#endif
NS_FAILED(Preferences::RegisterCallback(LoadJSContextOptions,
PREF_JS_OPTIONS_PREFIX,
nullptr)) ||
NS_FAILED(Preferences::RegisterCallbackAndCall(
LoadJSContextOptions,
PREF_WORKERS_OPTIONS_PREFIX,
nullptr))) {
NS_WARNING("Failed to register pref callbacks!");
}
NS_ASSERTION(gRuntimeServiceDuringInit == this, "Should be 'this'!");
gRuntimeServiceDuringInit = nullptr;
// We assume atomic 32bit reads/writes. If this assumption doesn't hold on
// some wacky platform then the worst that could happen is that the close
// handler will run for a slightly different amount of time.
if (NS_FAILED(Preferences::AddIntVarCache(
&sDefaultJSSettings.content.maxScriptRuntime,
PREF_MAX_SCRIPT_RUN_TIME_CONTENT,
MAX_SCRIPT_RUN_TIME_SEC)) ||
NS_FAILED(Preferences::AddIntVarCache(
&sDefaultJSSettings.chrome.maxScriptRuntime,
PREF_MAX_SCRIPT_RUN_TIME_CHROME, -1))) {
NS_WARNING("Failed to register timeout cache!");
}
int32_t maxPerDomain = Preferences::GetInt(PREF_WORKERS_MAX_PER_DOMAIN,
MAX_WORKERS_PER_DOMAIN);
gMaxWorkersPerDomain = std::max(0, maxPerDomain);
mDetectorName = Preferences::GetLocalizedCString("intl.charset.detector");
nsCOMPtr<nsIPlatformCharset> platformCharset =
do_GetService(NS_PLATFORMCHARSET_CONTRACTID, &rv);
if (NS_SUCCEEDED(rv)) {
rv = platformCharset->GetCharset(kPlatformCharsetSel_PlainTextInFile,
mSystemCharset);
}
rv = InitOSFileConstants();
if (NS_FAILED(rv)) {
return rv;
}
return NS_OK;
}
// This spins the event loop until all workers are finished and their threads
// have been joined.
void
RuntimeService::Cleanup()
{
AssertIsOnMainThread();
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
NS_WARN_IF_FALSE(obs, "Failed to get observer service?!");
// Tell anyone that cares that they're about to lose worker support.
if (obs && NS_FAILED(obs->NotifyObservers(nullptr, WORKERS_SHUTDOWN_TOPIC,
nullptr))) {
NS_WARNING("NotifyObservers failed!");
}
// That's it, no more workers.
mShuttingDown = true;
if (mIdleThreadTimer) {
if (NS_FAILED(mIdleThreadTimer->Cancel())) {
NS_WARNING("Failed to cancel idle timer!");
}
mIdleThreadTimer = nullptr;
}
if (mDomainMap.IsInitialized()) {
MutexAutoLock lock(mMutex);
nsAutoTArray<WorkerPrivate*, 100> workers;
mDomainMap.EnumerateRead(AddAllTopLevelWorkersToArray, &workers);
if (!workers.IsEmpty()) {
nsIThread* currentThread;
// Cancel all top-level workers.
{
MutexAutoUnlock unlock(mMutex);
currentThread = NS_GetCurrentThread();
NS_ASSERTION(currentThread, "This should never be null!");
AutoSafeJSContext cx;
JSAutoRequest ar(cx);
for (uint32_t index = 0; index < workers.Length(); index++) {
if (!workers[index]->Kill(cx)) {
NS_WARNING("Failed to cancel worker!");
}
}
}
// Shut down any idle threads.
if (!mIdleThreadArray.IsEmpty()) {
nsAutoTArray<nsCOMPtr<nsIThread>, 20> idleThreads;
uint32_t idleThreadCount = mIdleThreadArray.Length();
idleThreads.SetLength(idleThreadCount);
for (uint32_t index = 0; index < idleThreadCount; index++) {
NS_ASSERTION(mIdleThreadArray[index].mThread, "Null thread!");
idleThreads[index].swap(mIdleThreadArray[index].mThread);
}
mIdleThreadArray.Clear();
MutexAutoUnlock unlock(mMutex);
for (uint32_t index = 0; index < idleThreadCount; index++) {
if (NS_FAILED(idleThreads[index]->Shutdown())) {
NS_WARNING("Failed to shutdown thread!");
}
}
}
// And make sure all their final messages have run and all their threads
// have joined.
while (mDomainMap.Count()) {
MutexAutoUnlock unlock(mMutex);
if (!NS_ProcessNextEvent(currentThread)) {
NS_WARNING("Something bad happened!");
break;
}
}
}
}
if (mWindowMap.IsInitialized()) {
NS_ASSERTION(!mWindowMap.Count(), "All windows should have been released!");
}
if (mObserved) {
if (NS_FAILED(Preferences::UnregisterCallback(LoadJSContextOptions,
PREF_JS_OPTIONS_PREFIX,
nullptr)) ||
NS_FAILED(Preferences::UnregisterCallback(LoadJSContextOptions,
PREF_WORKERS_OPTIONS_PREFIX,
nullptr)) ||
#ifdef JS_GC_ZEAL
NS_FAILED(Preferences::UnregisterCallback(
LoadGCZealOptions,
PREF_JS_OPTIONS_PREFIX PREF_GCZEAL,
nullptr)) ||
NS_FAILED(Preferences::UnregisterCallback(
LoadGCZealOptions,
PREF_WORKERS_OPTIONS_PREFIX PREF_GCZEAL,
nullptr)) ||
#endif
NS_FAILED(Preferences::UnregisterCallback(
LoadJSGCMemoryOptions,
PREF_JS_OPTIONS_PREFIX PREF_MEM_OPTIONS_PREFIX,
nullptr)) ||
NS_FAILED(Preferences::UnregisterCallback(
LoadJSGCMemoryOptions,
PREF_WORKERS_OPTIONS_PREFIX PREF_MEM_OPTIONS_PREFIX,
nullptr)) ||
NS_FAILED(Preferences::UnregisterCallback(
LoadJITHardeningOption,
PREF_JS_OPTIONS_PREFIX PREF_JIT_HARDENING,
nullptr)) ||
NS_FAILED(Preferences::UnregisterCallback(
LoadJITHardeningOption,
PREF_WORKERS_OPTIONS_PREFIX PREF_JIT_HARDENING,
nullptr))) {
NS_WARNING("Failed to unregister pref callbacks!");
}
if (obs) {
if (NS_FAILED(obs->RemoveObserver(this, GC_REQUEST_OBSERVER_TOPIC))) {
NS_WARNING("Failed to unregister for GC request notifications!");
}
if (NS_FAILED(obs->RemoveObserver(this,
MEMORY_PRESSURE_OBSERVER_TOPIC))) {
NS_WARNING("Failed to unregister for memory pressure notifications!");
}
nsresult rv =
obs->RemoveObserver(this, NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID);
mObserved = NS_FAILED(rv);
}
}
CleanupOSFileConstants();
nsLayoutStatics::Release();
}
// static
PLDHashOperator
RuntimeService::AddAllTopLevelWorkersToArray(const nsACString& aKey,
WorkerDomainInfo* aData,
void* aUserArg)
{
nsTArray<WorkerPrivate*>* array =
static_cast<nsTArray<WorkerPrivate*>*>(aUserArg);
#ifdef DEBUG
for (uint32_t index = 0; index < aData->mActiveWorkers.Length(); index++) {
NS_ASSERTION(!aData->mActiveWorkers[index]->GetParent(),
"Shouldn't have a parent in this list!");
}
#endif
array->AppendElements(aData->mActiveWorkers);
// These might not be top-level workers...
for (uint32_t index = 0; index < aData->mQueuedWorkers.Length(); index++) {
WorkerPrivate* worker = aData->mQueuedWorkers[index];
if (!worker->GetParent()) {
array->AppendElement(worker);
}
}
return PL_DHASH_NEXT;
}
void
RuntimeService::GetWorkersForWindow(nsPIDOMWindow* aWindow,
nsTArray<WorkerPrivate*>& aWorkers)
{
AssertIsOnMainThread();
nsTArray<WorkerPrivate*>* workers;
if (mWindowMap.Get(aWindow, &workers)) {
NS_ASSERTION(!workers->IsEmpty(), "Should have been removed!");
aWorkers.AppendElements(*workers);
}
else {
NS_ASSERTION(aWorkers.IsEmpty(), "Should be empty!");
}
}
void
RuntimeService::CancelWorkersForWindow(JSContext* aCx,
nsPIDOMWindow* aWindow)
{
AssertIsOnMainThread();
nsAutoTArray<WorkerPrivate*, 100> workers;
GetWorkersForWindow(aWindow, workers);
if (!workers.IsEmpty()) {
for (uint32_t index = 0; index < workers.Length(); index++) {
if (!workers[index]->Cancel(aCx)) {
NS_WARNING("Failed to cancel worker!");
}
}
}
}
void
RuntimeService::SuspendWorkersForWindow(JSContext* aCx,
nsPIDOMWindow* aWindow)
{
AssertIsOnMainThread();
nsAutoTArray<WorkerPrivate*, 100> workers;
GetWorkersForWindow(aWindow, workers);
if (!workers.IsEmpty()) {
for (uint32_t index = 0; index < workers.Length(); index++) {
if (!workers[index]->Suspend(aCx)) {
NS_WARNING("Failed to cancel worker!");
}
}
}
}
void
RuntimeService::ResumeWorkersForWindow(nsIScriptContext* aCx,
nsPIDOMWindow* aWindow)
{
AssertIsOnMainThread();
nsAutoTArray<WorkerPrivate*, 100> workers;
GetWorkersForWindow(aWindow, workers);
if (!workers.IsEmpty()) {
for (uint32_t index = 0; index < workers.Length(); index++) {
if (!workers[index]->SynchronizeAndResume(aCx)) {
NS_WARNING("Failed to cancel worker!");
}
}
}
}
void
RuntimeService::NoteIdleThread(nsIThread* aThread)
{
AssertIsOnMainThread();
NS_ASSERTION(aThread, "Null pointer!");
static TimeDuration timeout =
TimeDuration::FromSeconds(IDLE_THREAD_TIMEOUT_SEC);
TimeStamp expirationTime = TimeStamp::Now() + timeout;
bool shutdown;
if (mShuttingDown) {
shutdown = true;
}
else {
MutexAutoLock lock(mMutex);
if (mIdleThreadArray.Length() < MAX_IDLE_THREADS) {
IdleThreadInfo* info = mIdleThreadArray.AppendElement();
info->mThread = aThread;
info->mExpirationTime = expirationTime;
shutdown = false;
}
else {
shutdown = true;
}
}
// Too many idle threads, just shut this one down.
if (shutdown) {
if (NS_FAILED(aThread->Shutdown())) {
NS_WARNING("Failed to shutdown thread!");
}
return;
}
// Schedule timer.
if (NS_FAILED(mIdleThreadTimer->
InitWithFuncCallback(ShutdownIdleThreads, nullptr,
IDLE_THREAD_TIMEOUT_SEC * 1000,
nsITimer::TYPE_ONE_SHOT))) {
NS_ERROR("Can't schedule timer!");
}
}
void
RuntimeService::UpdateAllWorkerJSContextOptions()
{
BROADCAST_ALL_WORKERS(UpdateJSContextOptions,
sDefaultJSSettings.content.options,
sDefaultJSSettings.chrome.options);
}
void
RuntimeService::UpdateAllWorkerMemoryParameter(JSGCParamKey aKey,
uint32_t aValue)
{
BROADCAST_ALL_WORKERS(UpdateJSWorkerMemoryParameter, aKey, aValue);
}
#ifdef JS_GC_ZEAL
void
RuntimeService::UpdateAllWorkerGCZeal()
{
BROADCAST_ALL_WORKERS(UpdateGCZeal, sDefaultJSSettings.gcZeal,
sDefaultJSSettings.gcZealFrequency);
}
#endif
void
RuntimeService::UpdateAllWorkerJITHardening(bool aJITHardening)
{
BROADCAST_ALL_WORKERS(UpdateJITHardening, aJITHardening);
}
void
RuntimeService::GarbageCollectAllWorkers(bool aShrinking)
{
BROADCAST_ALL_WORKERS(GarbageCollect, aShrinking);
}
// nsISupports
NS_IMPL_ISUPPORTS1(RuntimeService, nsIObserver)
// nsIObserver
NS_IMETHODIMP
RuntimeService::Observe(nsISupports* aSubject, const char* aTopic,
const PRUnichar* aData)
{
AssertIsOnMainThread();
if (!strcmp(aTopic, NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID)) {
Cleanup();
return NS_OK;
}
if (!strcmp(aTopic, GC_REQUEST_OBSERVER_TOPIC)) {
GarbageCollectAllWorkers(false);
return NS_OK;
}
if (!strcmp(aTopic, MEMORY_PRESSURE_OBSERVER_TOPIC)) {
GarbageCollectAllWorkers(true);
return NS_OK;
}
NS_NOTREACHED("Unknown observer topic!");
return NS_OK;
}
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