The Tor Browser: dom/workers/RuntimeService.cpp@925c144e1f1f (annotated)

dom/workers/RuntimeService.cpp@925c144e1f1f (annotated)

dom/workers/RuntimeService.cpp

Fri, 16 Jan 2015 18:13:44 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 16 Jan 2015 18:13:44 +0100
branch: TOR_BUG_9701
changeset 14: 925c144e1f1f
permissions: -rw-r--r--

Integrate suggestion from review to improve consistency with existing code.

 /* -*- 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 "nsIChannel.h"
 #include "nsIContentSecurityPolicy.h"
 #include "nsIDocument.h"
 #include "nsIDOMChromeWindow.h"
 #include "nsIEffectiveTLDService.h"
 #include "nsIObserverService.h"
 #include "nsIPrincipal.h"
 #include "nsIScriptContext.h"
 #include "nsIScriptSecurityManager.h"
 #include "nsISupportsPriority.h"
 #include "nsITimer.h"
 #include "nsIURI.h"
 #include "nsPIDOMWindow.h"
 #include <algorithm>
 #include "GeckoProfiler.h"
 #include "js/OldDebugAPI.h"
 #include "jsfriendapi.h"
 #include "mozilla/ArrayUtils.h"
 #include "mozilla/CycleCollectedJSRuntime.h"
 #include "mozilla/dom/asmjscache/AsmJSCache.h"
 #include "mozilla/dom/AtomList.h"
 #include "mozilla/dom/BindingUtils.h"
 #include "mozilla/dom/ErrorEventBinding.h"
 #include "mozilla/dom/EventTargetBinding.h"
 #include "mozilla/dom/MessageEventBinding.h"
 #include "mozilla/dom/WorkerBinding.h"
 #include "mozilla/DebugOnly.h"
 #include "mozilla/Preferences.h"
 #include "mozilla/dom/Navigator.h"
 #include "nsContentUtils.h"
 #include "nsCycleCollector.h"
 #include "nsDOMJSUtils.h"
 #include "nsISupportsImpl.h"
 #include "nsLayoutStatics.h"
 #include "nsNetUtil.h"
 #include "nsServiceManagerUtils.h"
 #include "nsThread.h"
 #include "nsThreadUtils.h"
 #include "nsXPCOM.h"
 #include "nsXPCOMPrivate.h"
 #include "OSFileConstants.h"
 #include "xpcpublic.h"
 #ifdef MOZ_NUWA_PROCESS
 #include "ipc/Nuwa.h"
 #endif
 #ifdef DEBUG
 #include "nsThreadManager.h"
 #endif
 #include "SharedWorker.h"
 #include "WorkerPrivate.h"
 #include "WorkerRunnable.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_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 CC_REQUEST_OBSERVER_TOPIC "child-cc-request"
 #define MEMORY_PRESSURE_OBSERVER_TOPIC "memory-pressure"
 #define PREF_GENERAL_APPNAME_OVERRIDE "general.appname.override"
 #define PREF_GENERAL_APPVERSION_OVERRIDE "general.appversion.override"
 #define PREF_GENERAL_PLATFORM_OVERRIDE "general.platform.override"
 #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_GCZEAL "gcZeal"
 #if !(defined(DEBUG) || defined(MOZ_ENABLE_JS_DUMP))
 #define DUMP_CONTROLLED_BY_PREF 1
 #define PREF_DOM_WINDOW_DUMP_ENABLED "browser.dom.window.dump.enabled"
 #endif
 #define PREF_WORKERS_LATEST_JS_VERSION "dom.workers.latestJSVersion"
 namespace {
 const uint32_t kNoIndex = uint32_t(-1);
 const JS::ContextOptions kRequiredContextOptions =
   JS::ContextOptions().setDontReportUncaught(true)
                       .setNoScriptRval(true);
 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",
   "Event",
   "MessageEvent",
   "ErrorEvent"
   // XXX Don't care about ProgressEvent since it should never leak to the main
   // thread.
 };
 static_assert(MOZ_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 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;
 }
 // This function creates a key for a SharedWorker composed by "name|scriptSpec".
 // If the name contains a '|', this will be replaced by '||'.
 void
 GenerateSharedWorkerKey(const nsACString& aScriptSpec, const nsACString& aName,
                         nsCString& aKey)
 {
   aKey.Truncate();
   aKey.SetCapacity(aScriptSpec.Length() + aName.Length() + 1);
   nsACString::const_iterator start, end;
   aName.BeginReading(start);
   aName.EndReading(end);
   for (; start != end; ++start) {
     if (*start == '|') {
       aKey.AppendASCII("||");
     } else {
       aKey.Append(*start);
     }
   }
   aKey.Append('|');
   aKey.Append(aScriptSpec);
 }
 void
 LoadRuntimeAndContextOptions(const char* aPrefName, void* /* aClosure */)
 {
   AssertIsOnMainThread();
   RuntimeService* rts = RuntimeService::GetService();
   if (!rts && !gRuntimeServiceDuringInit) {
     // May be shutting down, just bail.
     return;
   }
   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))) {
     return;
   }
 #ifdef JS_GC_ZEAL
   if (prefName.EqualsLiteral(PREF_JS_OPTIONS_PREFIX PREF_GCZEAL) ||
       prefName.EqualsLiteral(PREF_WORKERS_OPTIONS_PREFIX PREF_GCZEAL)) {
     return;
   }
 #endif
   // Runtime options.
   JS::RuntimeOptions runtimeOptions;
   if (GetWorkerPref<bool>(NS_LITERAL_CSTRING("asmjs"))) {
     runtimeOptions.setAsmJS(true);
   }
   if (GetWorkerPref<bool>(NS_LITERAL_CSTRING("baselinejit"))) {
     runtimeOptions.setBaseline(true);
   }
   if (GetWorkerPref<bool>(NS_LITERAL_CSTRING("ion"))) {
     runtimeOptions.setIon(true);
   }
   // Common options.
   JS::ContextOptions commonContextOptions = kRequiredContextOptions;
   if (GetWorkerPref<bool>(NS_LITERAL_CSTRING("strict"))) {
     commonContextOptions.setExtraWarnings(true);
   }
   if (GetWorkerPref<bool>(NS_LITERAL_CSTRING("werror"))) {
     commonContextOptions.setWerror(true);
   }
   // Content options.
   JS::ContextOptions contentContextOptions = commonContextOptions;
   // Chrome options.
   JS::ContextOptions chromeContextOptions = commonContextOptions;
 #ifdef DEBUG
   if (GetWorkerPref<bool>(NS_LITERAL_CSTRING("strict.debug"))) {
     chromeContextOptions.setExtraWarnings(true);
   }
 #endif
   RuntimeService::SetDefaultRuntimeAndContextOptions(runtimeOptions,
                                                      contentContextOptions,
                                                      chromeContextOptions);
   if (rts) {
     rts->UpdateAllWorkerRuntimeAndContextOptions();
   }
 }
 #ifdef JS_GC_ZEAL
 void
 LoadGCZealOptions(const char* /* aPrefName */, void* /* aClosure */)
 {
   AssertIsOnMainThread();
   RuntimeService* rts = RuntimeService::GetService();
   if (!rts && !gRuntimeServiceDuringInit) {
     // May be shutting down, just bail.
     return;
   }
   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();
   }
 }
 #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);
   }
 }
 void
 LoadJSGCMemoryOptions(const char* aPrefName, void* /* aClosure */)
 {
   AssertIsOnMainThread();
   RuntimeService* rts = RuntimeService::GetService();
   if (!rts && !gRuntimeServiceDuringInit) {
     // May be shutting down, just bail.
     return;
   }
   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;
   }
 #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
   }
 }
 void
 ErrorReporter(JSContext* aCx, const char* aMessage, JSErrorReport* aReport)
 {
   WorkerPrivate* worker = GetWorkerPrivateFromContext(aCx);
   MOZ_ASSERT(worker);
   return worker->ReportError(aCx, aMessage, aReport);
 }
 bool
 InterruptCallback(JSContext* aCx)
 {
   WorkerPrivate* worker = GetWorkerPrivateFromContext(aCx);
   MOZ_ASSERT(worker);
   // Now is a good time to turn on profiling if it's pending.
   profiler_js_operation_callback();
   return worker->InterruptCallback(aCx);
 }
 class LogViolationDetailsRunnable MOZ_FINAL : public nsRunnable
 {
   WorkerPrivate* mWorkerPrivate;
   nsCOMPtr<nsIEventTarget> mSyncLoopTarget;
   nsString mFileName;
   uint32_t mLineNum;
 public:
   LogViolationDetailsRunnable(WorkerPrivate* aWorker,
                               const nsString& aFileName,
                               uint32_t aLineNum)
   : mWorkerPrivate(aWorker), mFileName(aFileName), mLineNum(aLineNum)
   {
     MOZ_ASSERT(aWorker);
   }
   NS_DECL_ISUPPORTS_INHERITED
   bool
   Dispatch(JSContext* aCx)
   {
     AutoSyncLoopHolder syncLoop(mWorkerPrivate);
     mSyncLoopTarget = syncLoop.EventTarget();
     MOZ_ASSERT(mSyncLoopTarget);
     if (NS_FAILED(NS_DispatchToMainThread(this, NS_DISPATCH_NORMAL))) {
       JS_ReportError(aCx, "Failed to dispatch to main thread!");
       return false;
     }
     return syncLoop.Run();
   }
 private:
   NS_DECL_NSIRUNNABLE
 };
 bool
 ContentSecurityPolicyAllows(JSContext* aCx)
 {
   WorkerPrivate* worker = GetWorkerPrivateFromContext(aCx);
   worker->AssertIsOnWorkerThread();
   if (worker->GetReportCSPViolations()) {
     nsString fileName;
     uint32_t lineNum = 0;
     JS::AutoFilename file;
     if (JS::DescribeScriptedCaller(aCx, &file, &lineNum) && file.get()) {
       fileName = NS_ConvertUTF8toUTF16(file.get());
     } 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!");
   }
 }
 static nsIPrincipal*
 GetPrincipalForAsmJSCacheOp()
 {
   WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
   if (!workerPrivate) {
     return nullptr;
   }
   // asmjscache::OpenEntryForX guarnatee to only access the given nsIPrincipal
   // from the main thread.
   return workerPrivate->GetPrincipalDontAssertMainThread();
 }
 static bool
 AsmJSCacheOpenEntryForRead(JS::Handle<JSObject*> aGlobal,
                            const jschar* aBegin,
                            const jschar* aLimit,
                            size_t* aSize,
                            const uint8_t** aMemory,
                            intptr_t *aHandle)
 {
   nsIPrincipal* principal = GetPrincipalForAsmJSCacheOp();
   if (!principal) {
     return false;
   }
   return asmjscache::OpenEntryForRead(principal, aBegin, aLimit, aSize, aMemory,
                                       aHandle);
 }
 static bool
 AsmJSCacheOpenEntryForWrite(JS::Handle<JSObject*> aGlobal,
                             bool aInstalled,
                             const jschar* aBegin,
                             const jschar* aEnd,
                             size_t aSize,
                             uint8_t** aMemory,
                             intptr_t* aHandle)
 {
   nsIPrincipal* principal = GetPrincipalForAsmJSCacheOp();
   if (!principal) {
     return false;
   }
   return asmjscache::OpenEntryForWrite(principal, aInstalled, aBegin, aEnd,
                                        aSize, aMemory, aHandle);
 }
 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);
   JS::RuntimeOptionsRef(aRuntime) = settings.runtimeOptions;
   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_SetIsWorkerRuntime(aRuntime);
   JS_SetNativeStackQuota(aRuntime, WORKER_CONTEXT_NATIVE_STACK_LIMIT);
   // Security policy:
   static JSSecurityCallbacks securityCallbacks = {
     ContentSecurityPolicyAllows
   };
   JS_SetSecurityCallbacks(aRuntime, &securityCallbacks);
   // DOM helpers:
   static js::DOMCallbacks DOMCallbacks = {
     InstanceClassHasProtoAtDepth
   };
   SetDOMCallbacks(aRuntime, &DOMCallbacks);
   // Set up the asm.js cache callbacks
   static JS::AsmJSCacheOps asmJSCacheOps = {
     AsmJSCacheOpenEntryForRead,
     asmjscache::CloseEntryForRead,
     AsmJSCacheOpenEntryForWrite,
     asmjscache::CloseEntryForWrite,
     asmjscache::GetBuildId
   };
   JS::SetAsmJSCacheOps(aRuntime, &asmJSCacheOps);
   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_SetInterruptCallback(aRuntime, InterruptCallback);
   js::SetCTypesActivityCallback(aRuntime, CTypesActivityCallback);
   JS::ContextOptionsRef(workerCx) =
     aWorkerPrivate->IsChromeWorker() ? settings.chrome.contextOptions
                                      : settings.content.contextOptions;
 #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(JSRuntime* aParentRuntime, WorkerPrivate* aWorkerPrivate)
     : CycleCollectedJSRuntime(aParentRuntime,
                               WORKER_DEFAULT_RUNTIME_HEAPSIZE,
                               JS_NO_HELPER_THREADS),
     mWorkerPrivate(aWorkerPrivate)
   {
   }
   ~WorkerJSRuntime()
   {
     auto rtPrivate = static_cast<WorkerThreadRuntimePrivate*>(JS_GetRuntimePrivate(Runtime()));
     delete rtPrivate;
     JS_SetRuntimePrivate(Runtime(), nullptr);
     // The worker global should be unrooted and the shutdown cycle collection
     // should break all remaining cycles. The superclass destructor will run
     // the GC one final time and finalize any JSObjects that were participating
     // in cycles that were broken during CC shutdown.
     nsCycleCollector_shutdown();
     // The CC is shut down, and the superclass destructor will GC, so make sure
     // we don't try to CC again.
     mWorkerPrivate = nullptr;
   }
   virtual void
   PrepareForForgetSkippable() MOZ_OVERRIDE
   {
   }
   virtual void
   BeginCycleCollectionCallback() MOZ_OVERRIDE
   {
   }
   virtual void
   EndCycleCollectionCallback(CycleCollectorResults &aResults) MOZ_OVERRIDE
   {
   }
   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(nullptr);
     }
   }
 private:
   WorkerPrivate* mWorkerPrivate;
 };
 class WorkerThreadPrimaryRunnable MOZ_FINAL : public nsRunnable
 {
   WorkerPrivate* mWorkerPrivate;
   nsRefPtr<RuntimeService::WorkerThread> mThread;
   JSRuntime* mParentRuntime;
   class FinishedRunnable MOZ_FINAL : public nsRunnable
   {
     nsRefPtr<RuntimeService::WorkerThread> mThread;
   public:
     FinishedRunnable(already_AddRefed<RuntimeService::WorkerThread> aThread)
     : mThread(aThread)
     {
       MOZ_ASSERT(mThread);
     }
     NS_DECL_ISUPPORTS_INHERITED
   private:
     ~FinishedRunnable()
     { }
     NS_DECL_NSIRUNNABLE
   };
 public:
   WorkerThreadPrimaryRunnable(WorkerPrivate* aWorkerPrivate,
                               RuntimeService::WorkerThread* aThread,
                               JSRuntime* aParentRuntime)
   : mWorkerPrivate(aWorkerPrivate), mThread(aThread), mParentRuntime(aParentRuntime)
   {
     MOZ_ASSERT(aWorkerPrivate);
     MOZ_ASSERT(aThread);
   }
   NS_DECL_ISUPPORTS_INHERITED
 private:
   ~WorkerThreadPrimaryRunnable()
   { }
   NS_DECL_NSIRUNNABLE
 };
 class WorkerTaskRunnable MOZ_FINAL : public WorkerRunnable
 {
   nsRefPtr<WorkerTask> mTask;
 public:
   WorkerTaskRunnable(WorkerPrivate* aWorkerPrivate, WorkerTask* aTask)
   : WorkerRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount), mTask(aTask)
   {
     MOZ_ASSERT(aTask);
   }
 private:
   virtual bool
   PreDispatch(JSContext* aCx, WorkerPrivate* aWorkerPrivate) MOZ_OVERRIDE
   {
     // May be called on any thread!
     return true;
   }
   virtual void
   PostDispatch(JSContext* aCx, WorkerPrivate* aWorkerPrivate,
                bool aDispatchResult) MOZ_OVERRIDE
   {
     // May be called on any thread!
   }
   virtual bool
   WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) MOZ_OVERRIDE
   {
     return mTask->RunTask(aCx);
   }
 };
 void
 AppNameOverrideChanged(const char* /* aPrefName */, void* /* aClosure */)
 {
   AssertIsOnMainThread();
   const nsAdoptingString& override =
     mozilla::Preferences::GetString(PREF_GENERAL_APPNAME_OVERRIDE);
   RuntimeService* runtime = RuntimeService::GetService();
   if (runtime) {
     runtime->UpdateAppNameOverridePreference(override);
   }
 }
 void
 AppVersionOverrideChanged(const char* /* aPrefName */, void* /* aClosure */)
 {
   AssertIsOnMainThread();
   const nsAdoptingString& override =
     mozilla::Preferences::GetString(PREF_GENERAL_APPVERSION_OVERRIDE);
   RuntimeService* runtime = RuntimeService::GetService();
   if (runtime) {
     runtime->UpdateAppVersionOverridePreference(override);
   }
 }
 void
 PlatformOverrideChanged(const char* /* aPrefName */, void* /* aClosure */)
 {
   AssertIsOnMainThread();
   const nsAdoptingString& override =
     mozilla::Preferences::GetString(PREF_GENERAL_PLATFORM_OVERRIDE);
   RuntimeService* runtime = RuntimeService::GetService();
   if (runtime) {
     runtime->UpdatePlatformOverridePreference(override);
   }
 }
 } /* anonymous namespace */
 class RuntimeService::WorkerThread MOZ_FINAL : public nsThread
 {
   class Observer MOZ_FINAL : public nsIThreadObserver
   {
     WorkerPrivate* mWorkerPrivate;
   public:
     Observer(WorkerPrivate* aWorkerPrivate)
     : mWorkerPrivate(aWorkerPrivate)
     {
       MOZ_ASSERT(aWorkerPrivate);
       aWorkerPrivate->AssertIsOnWorkerThread();
     }
     NS_DECL_THREADSAFE_ISUPPORTS
   private:
     ~Observer()
     {
       mWorkerPrivate->AssertIsOnWorkerThread();
     }
     NS_DECL_NSITHREADOBSERVER
   };
   WorkerPrivate* mWorkerPrivate;
   nsRefPtr<Observer> mObserver;
 #ifdef DEBUG
   // Protected by nsThread::mLock.
   bool mAcceptingNonWorkerRunnables;
 #endif
 public:
   static already_AddRefed<WorkerThread>
   Create();
   void
   SetWorker(WorkerPrivate* aWorkerPrivate);
   NS_DECL_ISUPPORTS_INHERITED
   NS_IMETHOD
   Dispatch(nsIRunnable* aRunnable, uint32_t aFlags) MOZ_OVERRIDE;
 #ifdef DEBUG
   bool
   IsAcceptingNonWorkerRunnables()
   {
     MutexAutoLock lock(mLock);
     return mAcceptingNonWorkerRunnables;
   }
   void
   SetAcceptingNonWorkerRunnables(bool aAcceptingNonWorkerRunnables)
   {
     MutexAutoLock lock(mLock);
     mAcceptingNonWorkerRunnables = aAcceptingNonWorkerRunnables;
   }
 #endif
 private:
   WorkerThread()
   : nsThread(nsThread::NOT_MAIN_THREAD, WORKER_STACK_SIZE),
     mWorkerPrivate(nullptr)
 #ifdef DEBUG
     , mAcceptingNonWorkerRunnables(true)
 #endif
   { }
   ~WorkerThread()
   { }
 };
 BEGIN_WORKERS_NAMESPACE
 // Entry point for main thread non-window globals.
 bool
 ResolveWorkerClasses(JSContext* aCx, JS::Handle<JSObject*> aObj, JS::Handle<jsid> aId,
                      JS::MutableHandle<JSObject*> aObjp)
 {
   AssertIsOnMainThread();
   MOZ_ASSERT(nsContentUtils::IsCallerChrome());
   // 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 shouldResolve = false;
   for (uint32_t i = 0; i < ID_COUNT; i++) {
     if (gStringIDs[i] == aId) {
       shouldResolve = true;
       break;
     }
   }
   if (!shouldResolve) {
     aObjp.set(nullptr);
     return true;
   }
   if (!WorkerBinding::GetConstructorObject(aCx, aObj) ||
       !ChromeWorkerBinding::GetConstructorObject(aCx, aObj) ||
       !ErrorEventBinding::GetConstructorObject(aCx, aObj) ||
       !MessageEventBinding::GetConstructorObject(aCx, aObj)) {
     return false;
   }
   aObjp.set(aObj);
   return true;
 }
 void
 CancelWorkersForWindow(nsPIDOMWindow* aWindow)
 {
   AssertIsOnMainThread();
   RuntimeService* runtime = RuntimeService::GetService();
   if (runtime) {
     runtime->CancelWorkersForWindow(aWindow);
   }
 }
 void
 SuspendWorkersForWindow(nsPIDOMWindow* aWindow)
 {
   AssertIsOnMainThread();
   RuntimeService* runtime = RuntimeService::GetService();
   if (runtime) {
     runtime->SuspendWorkersForWindow(aWindow);
   }
 }
 void
 ResumeWorkersForWindow(nsPIDOMWindow* aWindow)
 {
   AssertIsOnMainThread();
   RuntimeService* runtime = RuntimeService::GetService();
   if (runtime) {
     runtime->ResumeWorkersForWindow(aWindow);
   }
 }
 WorkerCrossThreadDispatcher::WorkerCrossThreadDispatcher(
                                                   WorkerPrivate* aWorkerPrivate)
 : mMutex("WorkerCrossThreadDispatcher::mMutex"),
   mWorkerPrivate(aWorkerPrivate)
 {
   MOZ_ASSERT(aWorkerPrivate);
 }
 bool
 WorkerCrossThreadDispatcher::PostTask(WorkerTask* aTask)
 {
   MOZ_ASSERT(aTask);
   MutexAutoLock lock(mMutex);
   if (!mWorkerPrivate) {
     NS_WARNING("Posted a task to a WorkerCrossThreadDispatcher that is no "
                "longer accepting tasks!");
     return false;
   }
   nsRefPtr<WorkerTaskRunnable> runnable =
     new WorkerTaskRunnable(mWorkerPrivate, aTask);
   return runnable->Dispatch(nullptr);
 }
 WorkerPrivate*
 GetWorkerPrivateFromContext(JSContext* aCx)
 {
   MOZ_ASSERT(!NS_IsMainThread());
   MOZ_ASSERT(aCx);
   JSRuntime* rt = JS_GetRuntime(aCx);
   MOZ_ASSERT(rt);
   void* rtPrivate = JS_GetRuntimePrivate(rt);
   MOZ_ASSERT(rtPrivate);
   return static_cast<WorkerThreadRuntimePrivate*>(rtPrivate)->mWorkerPrivate;
 }
 WorkerPrivate*
 GetCurrentThreadWorkerPrivate()
 {
   MOZ_ASSERT(!NS_IsMainThread());
   CycleCollectedJSRuntime* ccrt = CycleCollectedJSRuntime::Get();
   if (!ccrt) {
     return nullptr;
   }
   JSRuntime* rt = ccrt->Runtime();
   MOZ_ASSERT(rt);
   void* rtPrivate = JS_GetRuntimePrivate(rt);
   MOZ_ASSERT(rtPrivate);
   return static_cast<WorkerThreadRuntimePrivate*>(rtPrivate)->mWorkerPrivate;
 }
 bool
 IsCurrentThreadRunningChromeWorker()
 {
   return GetCurrentThreadWorkerPrivate()->UsesSystemPrincipal();
 }
 JSContext*
 GetCurrentThreadJSContext()
 {
   return GetCurrentThreadWorkerPrivate()->GetJSContext();
 }
 END_WORKERS_NAMESPACE
 // This is only touched on the main thread. Initialized in Init() below.
 JSSettings RuntimeService::sDefaultJSSettings;
 bool RuntimeService::sDefaultPreferences[WORKERPREF_COUNT] = { false };
 RuntimeService::RuntimeService()
 : mMutex("RuntimeService::mMutex"), mObserved(false),
   mShuttingDown(false), mNavigatorPropertiesLoaded(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;
     }
   }
   bool isSharedWorker = aWorkerPrivate->IsSharedWorker();
   const nsCString& sharedWorkerName = aWorkerPrivate->SharedWorkerName();
   nsCString sharedWorkerScriptSpec;
   if (isSharedWorker) {
     AssertIsOnMainThread();
     nsCOMPtr<nsIURI> scriptURI = aWorkerPrivate->GetResolvedScriptURI();
     NS_ASSERTION(scriptURI, "Null script URI!");
     nsresult rv = scriptURI->GetSpec(sharedWorkerScriptSpec);
     if (NS_FAILED(rv)) {
       NS_WARNING("GetSpec failed?!");
       xpc::Throw(aCx, rv);
       return false;
     }
     NS_ASSERTION(!sharedWorkerScriptSpec.IsEmpty(), "Empty spec!");
   }
   const nsCString& domain = aWorkerPrivate->Domain();
   WorkerDomainInfo* domainInfo;
   bool queued = false;
   {
     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);
     }
     queued = gMaxWorkersPerDomain &&
              domainInfo->ActiveWorkerCount() >= gMaxWorkersPerDomain &&
              !domain.IsEmpty();
     if (queued) {
       domainInfo->mQueuedWorkers.AppendElement(aWorkerPrivate);
     }
     else if (parent) {
       domainInfo->mChildWorkerCount++;
     }
     else {
       domainInfo->mActiveWorkers.AppendElement(aWorkerPrivate);
     }
     if (isSharedWorker) {
       nsAutoCString key;
       GenerateSharedWorkerKey(sharedWorkerScriptSpec, sharedWorkerName, key);
       MOZ_ASSERT(!domainInfo->mSharedWorkerInfos.Get(key));
       SharedWorkerInfo* sharedWorkerInfo =
         new SharedWorkerInfo(aWorkerPrivate, sharedWorkerScriptSpec,
                              sharedWorkerName);
       domainInfo->mSharedWorkerInfos.Put(key, sharedWorkerInfo);
     }
   }
   // 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 (!mNavigatorPropertiesLoaded) {
       Navigator::AppName(mNavigatorProperties.mAppName,
                          false /* aUsePrefOverriddenValue */);
       if (NS_FAILED(Navigator::GetAppVersion(mNavigatorProperties.mAppVersion,
                                              false /* aUsePrefOverriddenValue */)) ||
           NS_FAILED(Navigator::GetPlatform(mNavigatorProperties.mPlatform,
                                            false /* aUsePrefOverriddenValue */)) ||
           NS_FAILED(NS_GetNavigatorUserAgent(mNavigatorProperties.mUserAgent))) {
         JS_ReportError(aCx, "Failed to load navigator strings!");
         UnregisterWorker(aCx, aWorkerPrivate);
         return false;
       }
       mNavigatorProperties.mAppNameOverridden =
         mozilla::Preferences::GetString(PREF_GENERAL_APPNAME_OVERRIDE);
       mNavigatorProperties.mAppVersionOverridden =
         mozilla::Preferences::GetString(PREF_GENERAL_APPVERSION_OVERRIDE);
       mNavigatorProperties.mPlatformOverridden =
         mozilla::Preferences::GetString(PREF_GENERAL_PLATFORM_OVERRIDE);
       mNavigatorPropertiesLoaded = true;
     }
     nsPIDOMWindow* window = aWorkerPrivate->GetWindow();
     nsTArray<WorkerPrivate*>* windowArray;
     if (!mWindowMap.Get(window, &windowArray)) {
       windowArray = new nsTArray<WorkerPrivate*>(1);
       mWindowMap.Put(window, windowArray);
     }
     if (!windowArray->Contains(aWorkerPrivate)) {
       windowArray->AppendElement(aWorkerPrivate);
     } else {
       MOZ_ASSERT(aWorkerPrivate->IsSharedWorker());
     }
   }
   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();
   }
   const nsCString& domain = aWorkerPrivate->Domain();
   WorkerPrivate* queuedWorker = nullptr;
   {
     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);
     }
     if (aWorkerPrivate->IsSharedWorker()) {
       MatchSharedWorkerInfo match(aWorkerPrivate);
       domainInfo->mSharedWorkerInfos.EnumerateRead(FindSharedWorkerInfo,
                                                    &match);
       if (match.mSharedWorkerInfo) {
         nsAutoCString key;
         GenerateSharedWorkerKey(match.mSharedWorkerInfo->mScriptSpec,
                                 match.mSharedWorkerInfo->mName, key);
         domainInfo->mSharedWorkerInfos.Remove(key);
       }
     }
     // 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()) {
       MOZ_ASSERT(domainInfo->mQueuedWorkers.IsEmpty());
       mDomainMap.Remove(domain);
     }
   }
   if (aWorkerPrivate->IsSharedWorker()) {
     AssertIsOnMainThread();
     nsAutoTArray<nsRefPtr<SharedWorker>, 5> sharedWorkersToNotify;
     aWorkerPrivate->GetAllSharedWorkers(sharedWorkersToNotify);
     for (uint32_t index = 0; index < sharedWorkersToNotify.Length(); index++) {
       MOZ_ASSERT(sharedWorkersToNotify[index]);
       sharedWorkersToNotify[index]->NoteDeadWorker(aCx);
     }
   }
   if (parent) {
     parent->RemoveChildWorker(aCx, aWorkerPrivate);
   }
   else if (aWorkerPrivate->IsSharedWorker()) {
     mWindowMap.Enumerate(RemoveSharedWorkerFromWindowMap, aWorkerPrivate);
   }
   else {
     // May be null.
     nsPIDOMWindow* window = aWorkerPrivate->GetWindow();
     nsTArray<WorkerPrivate*>* windowArray;
     MOZ_ALWAYS_TRUE(mWindowMap.Get(window, &windowArray));
     MOZ_ALWAYS_TRUE(windowArray->RemoveElement(aWorkerPrivate));
     if (windowArray->IsEmpty()) {
       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;
   }
   nsRefPtr<WorkerThread> thread;
   {
     MutexAutoLock lock(mMutex);
     if (!mIdleThreadArray.IsEmpty()) {
       uint32_t index = mIdleThreadArray.Length() - 1;
       mIdleThreadArray[index].mThread.swap(thread);
       mIdleThreadArray.RemoveElementAt(index);
     }
   }
   if (!thread) {
     thread = WorkerThread::Create();
     if (!thread) {
       UnregisterWorker(aCx, aWorkerPrivate);
       JS_ReportError(aCx, "Could not create new thread!");
       return false;
     }
   }
   MOZ_ASSERT(thread->IsAcceptingNonWorkerRunnables());
   int32_t priority = aWorkerPrivate->IsChromeWorker() ?
                      nsISupportsPriority::PRIORITY_NORMAL :
                      nsISupportsPriority::PRIORITY_LOW;
   if (NS_FAILED(thread->SetPriority(priority))) {
     NS_WARNING("Could not set the thread's priority!");
   }
   nsCOMPtr<nsIRunnable> runnable =
     new WorkerThreadPrimaryRunnable(aWorkerPrivate, thread, JS_GetParentRuntime(aCx));
   if (NS_FAILED(thread->Dispatch(runnable, NS_DISPATCH_NORMAL))) {
     UnregisterWorker(aCx, aWorkerPrivate);
     JS_ReportError(aCx, "Could not dispatch to thread!");
     return false;
   }
 #ifdef DEBUG
   thread->SetAcceptingNonWorkerRunnables(false);
 #endif
   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<nsRefPtr<WorkerThread>, 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;
       }
       nsRefPtr<WorkerThread>* 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.runtimeOptions = JS::RuntimeOptions();
     sDefaultJSSettings.chrome.contextOptions = kRequiredContextOptions;
     sDefaultJSSettings.chrome.maxScriptRuntime = -1;
     sDefaultJSSettings.chrome.compartmentOptions.setVersion(JSVERSION_LATEST);
     sDefaultJSSettings.content.contextOptions = kRequiredContextOptions;
     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);
   }
 // If dump is not controlled by pref, it's set to true.
 #ifndef DUMP_CONTROLLED_BY_PREF
   sDefaultPreferences[WORKERPREF_DUMP] = true;
 #endif
   mIdleThreadTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
   NS_ENSURE_STATE(mIdleThreadTimer);
   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);
   rv = obs->AddObserver(this, NS_XPCOM_SHUTDOWN_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, CC_REQUEST_OBSERVER_TOPIC, false))) {
     NS_WARNING("Failed to register for CC request notifications!");
   }
   if (NS_FAILED(obs->AddObserver(this, MEMORY_PRESSURE_OBSERVER_TOPIC,
                                  false))) {
     NS_WARNING("Failed to register for memory pressure notifications!");
   }
   if (NS_FAILED(obs->AddObserver(this, NS_IOSERVICE_OFFLINE_STATUS_TOPIC, false))) {
     NS_WARNING("Failed to register for offline notification event!");
   }
   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)) ||
 #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
 #if DUMP_CONTROLLED_BY_PREF
       NS_FAILED(Preferences::RegisterCallbackAndCall(
                                   WorkerPrefChanged,
                                   PREF_DOM_WINDOW_DUMP_ENABLED,
                                   reinterpret_cast<void *>(WORKERPREF_DUMP))) ||
 #endif
       NS_FAILED(Preferences::RegisterCallback(LoadRuntimeAndContextOptions,
                                               PREF_JS_OPTIONS_PREFIX,
                                               nullptr)) ||
       NS_FAILED(Preferences::RegisterCallbackAndCall(
                                                    LoadRuntimeAndContextOptions,
                                                    PREF_WORKERS_OPTIONS_PREFIX,
                                                    nullptr)) ||
       NS_FAILED(Preferences::RegisterCallbackAndCall(
                                                   AppNameOverrideChanged,
                                                   PREF_GENERAL_APPNAME_OVERRIDE,
                                                   nullptr)) ||
       NS_FAILED(Preferences::RegisterCallbackAndCall(
                                                AppVersionOverrideChanged,
                                                PREF_GENERAL_APPVERSION_OVERRIDE,
                                                nullptr)) ||
       NS_FAILED(Preferences::RegisterCallbackAndCall(
                                                  PlatformOverrideChanged,
                                                  PREF_GENERAL_PLATFORM_OVERRIDE,
                                                  nullptr)) ||
       NS_FAILED(Preferences::RegisterCallbackAndCall(
                                                  JSVersionChanged,
                                                  PREF_WORKERS_LATEST_JS_VERSION,
                                                  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);
   rv = InitOSFileConstants();
   if (NS_FAILED(rv)) {
     return rv;
   }
   return NS_OK;
 }
 void
 RuntimeService::Shutdown()
 {
   AssertIsOnMainThread();
   MOZ_ASSERT(!mShuttingDown);
   // That's it, no more workers.
   mShuttingDown = true;
   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!");
   }
   {
     MutexAutoLock lock(mMutex);
     nsAutoTArray<WorkerPrivate*, 100> workers;
     mDomainMap.EnumerateRead(AddAllTopLevelWorkersToArray, &workers);
     if (!workers.IsEmpty()) {
       // Cancel all top-level workers.
       {
         MutexAutoUnlock unlock(mMutex);
         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!");
           }
         }
       }
     }
   }
 }
 // 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?!");
   if (mIdleThreadTimer) {
     if (NS_FAILED(mIdleThreadTimer->Cancel())) {
       NS_WARNING("Failed to cancel idle timer!");
     }
     mIdleThreadTimer = nullptr;
   }
   {
     MutexAutoLock lock(mMutex);
     nsAutoTArray<WorkerPrivate*, 100> workers;
     mDomainMap.EnumerateRead(AddAllTopLevelWorkersToArray, &workers);
     if (!workers.IsEmpty()) {
       nsIThread* currentThread = NS_GetCurrentThread();
       NS_ASSERTION(currentThread, "This should never be null!");
       // Shut down any idle threads.
       if (!mIdleThreadArray.IsEmpty()) {
         nsAutoTArray<nsRefPtr<WorkerThread>, 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;
         }
       }
     }
   }
   NS_ASSERTION(!mWindowMap.Count(), "All windows should have been released!");
   if (mObserved) {
     if (NS_FAILED(Preferences::UnregisterCallback(JSVersionChanged,
                                                   PREF_WORKERS_LATEST_JS_VERSION,
                                                   nullptr)) ||
         NS_FAILED(Preferences::UnregisterCallback(AppNameOverrideChanged,
                                                   PREF_GENERAL_APPNAME_OVERRIDE,
                                                   nullptr)) ||
         NS_FAILED(Preferences::UnregisterCallback(AppVersionOverrideChanged,
                                                   PREF_GENERAL_APPVERSION_OVERRIDE,
                                                   nullptr)) ||
         NS_FAILED(Preferences::UnregisterCallback(PlatformOverrideChanged,
                                                   PREF_GENERAL_PLATFORM_OVERRIDE,
                                                   nullptr)) ||
         NS_FAILED(Preferences::UnregisterCallback(LoadRuntimeAndContextOptions,
                                                   PREF_JS_OPTIONS_PREFIX,
                                                   nullptr)) ||
         NS_FAILED(Preferences::UnregisterCallback(LoadRuntimeAndContextOptions,
                                                   PREF_WORKERS_OPTIONS_PREFIX,
                                                   nullptr)) ||
 #if DUMP_CONTROLLED_BY_PREF
         NS_FAILED(Preferences::UnregisterCallback(
                                   WorkerPrefChanged,
                                   PREF_DOM_WINDOW_DUMP_ENABLED,
                                   reinterpret_cast<void *>(WORKERPREF_DUMP))) ||
 #endif
 #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_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, CC_REQUEST_OBSERVER_TOPIC))) {
         NS_WARNING("Failed to unregister for CC request notifications!");
       }
       if (NS_FAILED(obs->RemoveObserver(this,
                                         MEMORY_PRESSURE_OBSERVER_TOPIC))) {
         NS_WARNING("Failed to unregister for memory pressure notifications!");
       }
       if (NS_FAILED(obs->RemoveObserver(this,
                                         NS_IOSERVICE_OFFLINE_STATUS_TOPIC))) {
         NS_WARNING("Failed to unregister for offline notification event!");
       }
       obs->RemoveObserver(this, NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID);
       obs->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
       mObserved = false;
     }
   }
   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;
 }
 // static
 PLDHashOperator
 RuntimeService::RemoveSharedWorkerFromWindowMap(
                                   nsPIDOMWindow* aKey,
                                   nsAutoPtr<nsTArray<WorkerPrivate*> >& aData,
                                   void* aUserArg)
 {
   AssertIsOnMainThread();
   MOZ_ASSERT(aData.get());
   MOZ_ASSERT(aUserArg);
   auto workerPrivate = static_cast<WorkerPrivate*>(aUserArg);
   MOZ_ASSERT(workerPrivate->IsSharedWorker());
   if (aData->RemoveElement(workerPrivate)) {
     MOZ_ASSERT(!aData->Contains(workerPrivate), "Added worker more than once!");
     if (aData->IsEmpty()) {
       return PL_DHASH_REMOVE;
     }
   }
   return PL_DHASH_NEXT;
 }
 // static
 PLDHashOperator
 RuntimeService::FindSharedWorkerInfo(const nsACString& aKey,
                                      SharedWorkerInfo* aData,
                                      void* aUserArg)
 {
   auto match = static_cast<MatchSharedWorkerInfo*>(aUserArg);
   if (aData->mWorkerPrivate == match->mWorkerPrivate) {
     match->mSharedWorkerInfo = aData;
     return PL_DHASH_STOP;
   }
   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(nsPIDOMWindow* aWindow)
 {
   AssertIsOnMainThread();
   nsAutoTArray<WorkerPrivate*, MAX_WORKERS_PER_DOMAIN> workers;
   GetWorkersForWindow(aWindow, workers);
   if (!workers.IsEmpty()) {
     nsCOMPtr<nsIScriptGlobalObject> sgo = do_QueryInterface(aWindow);
     MOZ_ASSERT(sgo);
     nsIScriptContext* scx = sgo->GetContext();
     AutoPushJSContext cx(scx ?
                          scx->GetNativeContext() :
                          nsContentUtils::GetSafeJSContext());
     for (uint32_t index = 0; index < workers.Length(); index++) {
       WorkerPrivate*& worker = workers[index];
       if (worker->IsSharedWorker()) {
         worker->CloseSharedWorkersForWindow(aWindow);
       } else if (!worker->Cancel(cx)) {
         JS_ReportPendingException(cx);
       }
     }
   }
 }
 void
 RuntimeService::SuspendWorkersForWindow(nsPIDOMWindow* aWindow)
 {
   AssertIsOnMainThread();
   MOZ_ASSERT(aWindow);
   nsAutoTArray<WorkerPrivate*, MAX_WORKERS_PER_DOMAIN> workers;
   GetWorkersForWindow(aWindow, workers);
   if (!workers.IsEmpty()) {
     nsCOMPtr<nsIScriptGlobalObject> sgo = do_QueryInterface(aWindow);
     MOZ_ASSERT(sgo);
     nsIScriptContext* scx = sgo->GetContext();
     AutoPushJSContext cx(scx ?
                          scx->GetNativeContext() :
                          nsContentUtils::GetSafeJSContext());
     for (uint32_t index = 0; index < workers.Length(); index++) {
       if (!workers[index]->Suspend(cx, aWindow)) {
         JS_ReportPendingException(cx);
       }
     }
   }
 }
 void
 RuntimeService::ResumeWorkersForWindow(nsPIDOMWindow* aWindow)
 {
   AssertIsOnMainThread();
   MOZ_ASSERT(aWindow);
   nsAutoTArray<WorkerPrivate*, MAX_WORKERS_PER_DOMAIN> workers;
   GetWorkersForWindow(aWindow, workers);
   if (!workers.IsEmpty()) {
     nsCOMPtr<nsIScriptGlobalObject> sgo = do_QueryInterface(aWindow);
     MOZ_ASSERT(sgo);
     nsIScriptContext* scx = sgo->GetContext();
     AutoPushJSContext cx(scx ?
                          scx->GetNativeContext() :
                          nsContentUtils::GetSafeJSContext());
     for (uint32_t index = 0; index < workers.Length(); index++) {
       if (!workers[index]->SynchronizeAndResume(cx, aWindow, scx)) {
         JS_ReportPendingException(cx);
       }
     }
   }
 }
 nsresult
 RuntimeService::CreateSharedWorker(const GlobalObject& aGlobal,
                                    const nsAString& aScriptURL,
                                    const nsACString& aName,
                                    SharedWorker** aSharedWorker)
 {
   AssertIsOnMainThread();
   nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aGlobal.GetAsSupports());
   MOZ_ASSERT(window);
   JSContext* cx = aGlobal.GetContext();
   WorkerPrivate::LoadInfo loadInfo;
   nsresult rv = WorkerPrivate::GetLoadInfo(cx, window, nullptr, aScriptURL,
                                            false, &loadInfo);
   NS_ENSURE_SUCCESS(rv, rv);
   MOZ_ASSERT(loadInfo.mResolvedScriptURI);
   nsCString scriptSpec;
   rv = loadInfo.mResolvedScriptURI->GetSpec(scriptSpec);
   NS_ENSURE_SUCCESS(rv, rv);
   nsRefPtr<WorkerPrivate> workerPrivate;
   {
     MutexAutoLock lock(mMutex);
     WorkerDomainInfo* domainInfo;
     SharedWorkerInfo* sharedWorkerInfo;
     nsAutoCString key;
     GenerateSharedWorkerKey(scriptSpec, aName, key);
     if (mDomainMap.Get(loadInfo.mDomain, &domainInfo) &&
         domainInfo->mSharedWorkerInfos.Get(key, &sharedWorkerInfo)) {
       workerPrivate = sharedWorkerInfo->mWorkerPrivate;
     }
   }
   bool created = false;
   if (!workerPrivate) {
     ErrorResult rv;
     workerPrivate =
       WorkerPrivate::Constructor(aGlobal, aScriptURL, false,
                                  WorkerPrivate::WorkerTypeShared, aName,
                                  &loadInfo, rv);
     NS_ENSURE_TRUE(workerPrivate, rv.ErrorCode());
     created = true;
   }
   MOZ_ASSERT(workerPrivate->IsSharedWorker());
   nsRefPtr<SharedWorker> sharedWorker =
     new SharedWorker(window, workerPrivate);
   if (!workerPrivate->RegisterSharedWorker(cx, sharedWorker)) {
     NS_WARNING("Worker is unreachable, this shouldn't happen!");
     sharedWorker->Close();
     return NS_ERROR_FAILURE;
   }
   // This is normally handled in RegisterWorker, but that wasn't called if the
   // worker already existed.
   if (!created) {
     nsTArray<WorkerPrivate*>* windowArray;
     if (!mWindowMap.Get(window, &windowArray)) {
       windowArray = new nsTArray<WorkerPrivate*>(1);
       mWindowMap.Put(window, windowArray);
     }
     if (!windowArray->Contains(workerPrivate)) {
       windowArray->AppendElement(workerPrivate);
     }
   }
   sharedWorker.forget(aSharedWorker);
   return NS_OK;
 }
 void
 RuntimeService::ForgetSharedWorker(WorkerPrivate* aWorkerPrivate)
 {
   AssertIsOnMainThread();
   MOZ_ASSERT(aWorkerPrivate);
   MOZ_ASSERT(aWorkerPrivate->IsSharedWorker());
   MutexAutoLock lock(mMutex);
   WorkerDomainInfo* domainInfo;
   if (mDomainMap.Get(aWorkerPrivate->Domain(), &domainInfo)) {
     MatchSharedWorkerInfo match(aWorkerPrivate);
     domainInfo->mSharedWorkerInfos.EnumerateRead(FindSharedWorkerInfo,
                                                  &match);
     if (match.mSharedWorkerInfo) {
       nsAutoCString key;
       GenerateSharedWorkerKey(match.mSharedWorkerInfo->mScriptSpec,
                               match.mSharedWorkerInfo->mName, key);
       domainInfo->mSharedWorkerInfos.Remove(key);
     }
   }
 }
 void
 RuntimeService::NoteIdleThread(WorkerThread* aThread)
 {
   AssertIsOnMainThread();
   MOZ_ASSERT(aThread);
 #ifdef DEBUG
   aThread->SetAcceptingNonWorkerRunnables(true);
 #endif
   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) {
     MOZ_ALWAYS_TRUE(NS_SUCCEEDED(aThread->Shutdown()));
     return;
   }
   // Schedule timer.
   MOZ_ALWAYS_TRUE(NS_SUCCEEDED(mIdleThreadTimer->InitWithFuncCallback(
                                                  ShutdownIdleThreads, nullptr,
                                                  IDLE_THREAD_TIMEOUT_SEC * 1000,
                                                  nsITimer::TYPE_ONE_SHOT)));
 }
 void
 RuntimeService::UpdateAllWorkerRuntimeAndContextOptions()
 {
   BROADCAST_ALL_WORKERS(UpdateRuntimeAndContextOptions,
                         sDefaultJSSettings.runtimeOptions,
                         sDefaultJSSettings.content.contextOptions,
                         sDefaultJSSettings.chrome.contextOptions);
 }
 void
 RuntimeService::UpdateAppNameOverridePreference(const nsAString& aValue)
 {
   AssertIsOnMainThread();
   mNavigatorProperties.mAppNameOverridden = aValue;
 }
 void
 RuntimeService::UpdateAppVersionOverridePreference(const nsAString& aValue)
 {
   AssertIsOnMainThread();
   mNavigatorProperties.mAppVersionOverridden = aValue;
 }
 void
 RuntimeService::UpdatePlatformOverridePreference(const nsAString& aValue)
 {
   AssertIsOnMainThread();
   mNavigatorProperties.mPlatformOverridden = aValue;
 }
 void
 RuntimeService::UpdateAllWorkerPreference(WorkerPreference aPref, bool aValue)
 {
   BROADCAST_ALL_WORKERS(UpdatePreference, aPref, aValue);
 }
 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::GarbageCollectAllWorkers(bool aShrinking)
 {
   BROADCAST_ALL_WORKERS(GarbageCollect, aShrinking);
 }
 void
 RuntimeService::CycleCollectAllWorkers()
 {
   BROADCAST_ALL_WORKERS(CycleCollect, /* dummy = */ false);
 }
 void
 RuntimeService::SendOfflineStatusChangeEventToAllWorkers(bool aIsOffline)
 {
   BROADCAST_ALL_WORKERS(OfflineStatusChangeEvent, aIsOffline);
 }
 // nsISupports
 NS_IMPL_ISUPPORTS(RuntimeService, nsIObserver)
 // nsIObserver
 NS_IMETHODIMP
 RuntimeService::Observe(nsISupports* aSubject, const char* aTopic,
                         const char16_t* aData)
 {
   AssertIsOnMainThread();
   if (!strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
     Shutdown();
     return NS_OK;
   }
   if (!strcmp(aTopic, NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID)) {
     Cleanup();
     return NS_OK;
   }
   if (!strcmp(aTopic, GC_REQUEST_OBSERVER_TOPIC)) {
     GarbageCollectAllWorkers(/* shrinking = */ false);
     return NS_OK;
   }
   if (!strcmp(aTopic, CC_REQUEST_OBSERVER_TOPIC)) {
     CycleCollectAllWorkers();
     return NS_OK;
   }
   if (!strcmp(aTopic, MEMORY_PRESSURE_OBSERVER_TOPIC)) {
     GarbageCollectAllWorkers(/* shrinking = */ true);
     CycleCollectAllWorkers();
     return NS_OK;
   }
   if (!strcmp(aTopic, NS_IOSERVICE_OFFLINE_STATUS_TOPIC)) {
     SendOfflineStatusChangeEventToAllWorkers(NS_IsOffline());
     return NS_OK;
   }
   NS_NOTREACHED("Unknown observer topic!");
   return NS_OK;
 }
 /* static */ void
 RuntimeService::WorkerPrefChanged(const char* aPrefName, void* aClosure)
 {
   AssertIsOnMainThread();
   uintptr_t tmp = reinterpret_cast<uintptr_t>(aClosure);
   MOZ_ASSERT(tmp < WORKERPREF_COUNT);
   WorkerPreference key = static_cast<WorkerPreference>(tmp);
 #ifdef DUMP_CONTROLLED_BY_PREF
   if (key == WORKERPREF_DUMP) {
     key = WORKERPREF_DUMP;
     sDefaultPreferences[WORKERPREF_DUMP] =
       Preferences::GetBool(PREF_DOM_WINDOW_DUMP_ENABLED, false);
   }
 #endif
   // This function should never be registered as a callback for a preference it
   // does not handle.
   MOZ_ASSERT(key != WORKERPREF_COUNT);
   RuntimeService* rts = RuntimeService::GetService();
   if (rts) {
     rts->UpdateAllWorkerPreference(key, sDefaultPreferences[key]);
   }
 }
 void
 RuntimeService::JSVersionChanged(const char* /* aPrefName */, void* /* aClosure */)
 {
   AssertIsOnMainThread();
   bool useLatest = Preferences::GetBool(PREF_WORKERS_LATEST_JS_VERSION, false);
   JS::CompartmentOptions& options = sDefaultJSSettings.content.compartmentOptions;
   options.setVersion(useLatest ? JSVERSION_LATEST : JSVERSION_DEFAULT);
 }
 // static
 already_AddRefed<RuntimeService::WorkerThread>
 RuntimeService::WorkerThread::Create()
 {
   MOZ_ASSERT(nsThreadManager::get());
   nsRefPtr<WorkerThread> thread = new WorkerThread();
   if (NS_FAILED(thread->Init())) {
     NS_WARNING("Failed to create new thread!");
     return nullptr;
   }
   NS_SetThreadName(thread, "DOM Worker");
   return thread.forget();
 }
 void
 RuntimeService::WorkerThread::SetWorker(WorkerPrivate* aWorkerPrivate)
 {
   MOZ_ASSERT(PR_GetCurrentThread() == mThread);
   MOZ_ASSERT_IF(aWorkerPrivate, !mWorkerPrivate);
   MOZ_ASSERT_IF(!aWorkerPrivate, mWorkerPrivate);
   // No need to lock here because mWorkerPrivate is only modified on mThread.
   if (mWorkerPrivate) {
     MOZ_ASSERT(mObserver);
     MOZ_ALWAYS_TRUE(NS_SUCCEEDED(RemoveObserver(mObserver)));
     mObserver = nullptr;
     mWorkerPrivate->SetThread(nullptr);
   }
   mWorkerPrivate = aWorkerPrivate;
   if (mWorkerPrivate) {
     mWorkerPrivate->SetThread(this);
     nsRefPtr<Observer> observer = new Observer(mWorkerPrivate);
     MOZ_ALWAYS_TRUE(NS_SUCCEEDED(AddObserver(observer)));
     mObserver.swap(observer);
   }
 }
 NS_IMPL_ISUPPORTS_INHERITED0(RuntimeService::WorkerThread, nsThread)
 NS_IMETHODIMP
 RuntimeService::WorkerThread::Dispatch(nsIRunnable* aRunnable, uint32_t aFlags)
 {
   // May be called on any thread!
 #ifdef DEBUG
   if (PR_GetCurrentThread() == mThread) {
     MOZ_ASSERT(mWorkerPrivate);
     mWorkerPrivate->AssertIsOnWorkerThread();
   }
   else if (aRunnable && !IsAcceptingNonWorkerRunnables()) {
     // Only enforce cancelable runnables after we've started the worker loop.
     nsCOMPtr<nsICancelableRunnable> cancelable = do_QueryInterface(aRunnable);
     MOZ_ASSERT(cancelable,
                "Should have been wrapped by the worker's event target!");
   }
 #endif
   // Workers only support asynchronous dispatch for now.
   if (NS_WARN_IF(aFlags != NS_DISPATCH_NORMAL)) {
     return NS_ERROR_UNEXPECTED;
   }
   nsIRunnable* runnableToDispatch;
   nsRefPtr<WorkerRunnable> workerRunnable;
   if (aRunnable && PR_GetCurrentThread() == mThread) {
     // No need to lock here because mWorkerPrivate is only modified on mThread.
     workerRunnable = mWorkerPrivate->MaybeWrapAsWorkerRunnable(aRunnable);
     runnableToDispatch = workerRunnable;
   }
   else {
     runnableToDispatch = aRunnable;
   }
   nsresult rv = nsThread::Dispatch(runnableToDispatch, NS_DISPATCH_NORMAL);
   if (NS_WARN_IF(NS_FAILED(rv))) {
     return rv;
   }
   return NS_OK;
 }
 NS_IMPL_ISUPPORTS(RuntimeService::WorkerThread::Observer, nsIThreadObserver)
 NS_IMETHODIMP
 RuntimeService::WorkerThread::Observer::OnDispatchedEvent(
                                                 nsIThreadInternal* /*aThread */)
 {
   MOZ_ASSUME_UNREACHABLE("This should never be called!");
 }
 NS_IMETHODIMP
 RuntimeService::WorkerThread::Observer::OnProcessNextEvent(
                                                nsIThreadInternal* /* aThread */,
                                                bool aMayWait,
                                                uint32_t aRecursionDepth)
 {
   mWorkerPrivate->AssertIsOnWorkerThread();
   MOZ_ASSERT(!aMayWait);
   mWorkerPrivate->OnProcessNextEvent(aRecursionDepth);
   return NS_OK;
 }
 NS_IMETHODIMP
 RuntimeService::WorkerThread::Observer::AfterProcessNextEvent(
                                                nsIThreadInternal* /* aThread */,
                                                uint32_t aRecursionDepth,
                                                bool /* aEventWasProcessed */)
 {
   mWorkerPrivate->AssertIsOnWorkerThread();
   mWorkerPrivate->AfterProcessNextEvent(aRecursionDepth);
   return NS_OK;
 }
 NS_IMPL_ISUPPORTS_INHERITED0(LogViolationDetailsRunnable, nsRunnable)
 NS_IMETHODIMP
 LogViolationDetailsRunnable::Run()
 {
   AssertIsOnMainThread();
   nsIContentSecurityPolicy* csp = mWorkerPrivate->GetCSP();
   if (csp) {
     NS_NAMED_LITERAL_STRING(scriptSample,
         "Call to eval() or related function blocked by CSP.");
     if (mWorkerPrivate->GetReportCSPViolations()) {
       csp->LogViolationDetails(nsIContentSecurityPolicy::VIOLATION_TYPE_EVAL,
                                mFileName, scriptSample, mLineNum,
                                EmptyString(), EmptyString());
     }
   }
   nsRefPtr<MainThreadStopSyncLoopRunnable> response =
     new MainThreadStopSyncLoopRunnable(mWorkerPrivate, mSyncLoopTarget.forget(),
                                        true);
   MOZ_ALWAYS_TRUE(response->Dispatch(nullptr));
   return NS_OK;
 }
 NS_IMPL_ISUPPORTS_INHERITED0(WorkerThreadPrimaryRunnable, nsRunnable)
 NS_IMETHODIMP
 WorkerThreadPrimaryRunnable::Run()
 {
 #ifdef MOZ_NUWA_PROCESS
   if (IsNuwaProcess()) {
     NS_ASSERTION(NuwaMarkCurrentThread != nullptr,
                   "NuwaMarkCurrentThread is undefined!");
     NuwaMarkCurrentThread(nullptr, nullptr);
     NuwaFreezeCurrentThread();
   }
 #endif
   char stackBaseGuess;
   nsAutoCString threadName;
   threadName.AssignLiteral("WebWorker '");
   threadName.Append(NS_LossyConvertUTF16toASCII(mWorkerPrivate->ScriptURL()));
   threadName.Append('\'');
   profiler_register_thread(threadName.get(), &stackBaseGuess);
   mThread->SetWorker(mWorkerPrivate);
   mWorkerPrivate->AssertIsOnWorkerThread();
   {
     nsCycleCollector_startup();
     WorkerJSRuntime runtime(mParentRuntime, mWorkerPrivate);
     JSRuntime* rt = runtime.Runtime();
     JSContext* cx = CreateJSContextForWorker(mWorkerPrivate, rt);
     if (!cx) {
       // XXX need to fire an error at parent.
       NS_ERROR("Failed to create runtime and context!");
       return NS_ERROR_FAILURE;
     }
     {
 #ifdef MOZ_ENABLE_PROFILER_SPS
       PseudoStack* stack = mozilla_get_pseudo_stack();
       if (stack) {
         stack->sampleRuntime(rt);
       }
 #endif
       {
         JSAutoRequest ar(cx);
         mWorkerPrivate->DoRunLoop(cx);
         JS_ReportPendingException(cx);
       }
 #ifdef MOZ_ENABLE_PROFILER_SPS
       if (stack) {
         stack->sampleRuntime(nullptr);
       }
 #endif
     }
     // 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.
   }
   mThread->SetWorker(nullptr);
   mWorkerPrivate->ScheduleDeletion(WorkerPrivate::WorkerRan);
   // It is no longer safe to touch mWorkerPrivate.
   mWorkerPrivate = nullptr;
   // Now recycle this thread.
   nsCOMPtr<nsIThread> mainThread = do_GetMainThread();
   MOZ_ASSERT(mainThread);
   nsRefPtr<FinishedRunnable> finishedRunnable =
     new FinishedRunnable(mThread.forget());
   MOZ_ALWAYS_TRUE(NS_SUCCEEDED(mainThread->Dispatch(finishedRunnable,
                                                     NS_DISPATCH_NORMAL)));
   profiler_unregister_thread();
   return NS_OK;
 }
 NS_IMPL_ISUPPORTS_INHERITED0(WorkerThreadPrimaryRunnable::FinishedRunnable,
                              nsRunnable)
 NS_IMETHODIMP
 WorkerThreadPrimaryRunnable::FinishedRunnable::Run()
 {
   AssertIsOnMainThread();
   nsRefPtr<RuntimeService::WorkerThread> thread;
   mThread.swap(thread);
   RuntimeService* rts = RuntimeService::GetService();
   if (rts) {
     rts->NoteIdleThread(thread);
   }
   else if (thread->ShutdownRequired()) {
     MOZ_ALWAYS_TRUE(NS_SUCCEEDED(thread->Shutdown()));
   }
   return NS_OK;
 }

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dom/workers/RuntimeService.cpp@925c144e1f1f (annotated)

dom/workers/RuntimeService.cpp