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Mypal/js/src/vm/Runtime.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
* 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 "mozilla/ArrayUtils.h"
#include "mozilla/Atomics.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/ThreadLocal.h"
#include "mozilla/Unused.h"
#if defined(XP_DARWIN)
#include <mach/mach.h>
#elif defined(XP_UNIX)
#include <sys/resource.h>
#elif defined(XP_WIN)
#include <processthreadsapi.h>
#include <windows.h>
#endif // defined(XP_DARWIN) || defined(XP_UNIX) || defined(XP_WIN)
#include <locale.h>
#include <string.h>
#ifdef JS_CAN_CHECK_THREADSAFE_ACCESSES
# include <sys/mman.h>
#endif
#include "jsatom.h"
#include "jsdtoa.h"
#include "jsgc.h"
#include "jsmath.h"
#include "jsnativestack.h"
#include "jsobj.h"
#include "jsscript.h"
#include "jswin.h"
#include "jswrapper.h"
#include "builtin/Promise.h"
#include "gc/GCInternals.h"
#include "jit/arm/Simulator-arm.h"
#include "jit/arm64/vixl/Simulator-vixl.h"
#include "jit/IonBuilder.h"
#include "jit/JitCompartment.h"
#include "jit/mips32/Simulator-mips32.h"
#include "jit/mips64/Simulator-mips64.h"
#include "jit/PcScriptCache.h"
#include "js/Date.h"
#include "js/MemoryMetrics.h"
#include "js/SliceBudget.h"
#include "vm/Debugger.h"
#include "wasm/WasmSignalHandlers.h"
#include "jscntxtinlines.h"
#include "jsgcinlines.h"
using namespace js;
using namespace js::gc;
using mozilla::Atomic;
using mozilla::DebugOnly;
using mozilla::NegativeInfinity;
using mozilla::PodZero;
using mozilla::PodArrayZero;
using mozilla::PositiveInfinity;
using JS::GenericNaN;
using JS::DoubleNaNValue;
/* static */ MOZ_THREAD_LOCAL(PerThreadData*) js::TlsPerThreadData;
/* static */ Atomic<size_t> JSRuntime::liveRuntimesCount;
namespace js {
bool gCanUseExtraThreads = true;
} // namespace js
void
js::DisableExtraThreads()
{
gCanUseExtraThreads = false;
}
const JSSecurityCallbacks js::NullSecurityCallbacks = { };
PerThreadData::PerThreadData(JSRuntime* runtime)
: runtime_(runtime)
#ifdef JS_TRACE_LOGGING
, traceLogger(nullptr)
#endif
, autoFlushICache_(nullptr)
, dtoaState(nullptr)
, suppressGC(0)
#ifdef DEBUG
, ionCompiling(false)
, ionCompilingSafeForMinorGC(false)
, performingGC(false)
, gcSweeping(false)
#endif
{}
PerThreadData::~PerThreadData()
{
if (dtoaState)
DestroyDtoaState(dtoaState);
}
bool
PerThreadData::init()
{
dtoaState = NewDtoaState();
if (!dtoaState)
return false;
return true;
}
static const JSWrapObjectCallbacks DefaultWrapObjectCallbacks = {
TransparentObjectWrapper,
nullptr
};
static size_t
ReturnZeroSize(const void* p)
{
return 0;
}
JSRuntime::JSRuntime(JSRuntime* parentRuntime)
: mainThread(this),
jitTop(nullptr),
jitActivation(nullptr),
jitStackLimit_(0xbad),
jitStackLimitNoInterrupt_(0xbad),
#ifdef DEBUG
ionBailAfter_(0),
#endif
activation_(nullptr),
profilingActivation_(nullptr),
profilerSampleBufferGen_(0),
profilerSampleBufferLapCount_(1),
wasmActivationStack_(nullptr),
entryMonitor(nullptr),
noExecuteDebuggerTop(nullptr),
parentRuntime(parentRuntime),
#ifdef DEBUG
updateChildRuntimeCount(parentRuntime),
#endif
interrupt_(false),
handlingSegFault(false),
handlingJitInterrupt_(false),
interruptCallbackDisabled(false),
getIncumbentGlobalCallback(nullptr),
enqueuePromiseJobCallback(nullptr),
enqueuePromiseJobCallbackData(nullptr),
promiseRejectionTrackerCallback(nullptr),
promiseRejectionTrackerCallbackData(nullptr),
startAsyncTaskCallback(nullptr),
finishAsyncTaskCallback(nullptr),
promiseTasksToDestroy(mutexid::PromiseTaskPtrVector),
exclusiveAccessLock(mutexid::RuntimeExclusiveAccess),
#ifdef DEBUG
mainThreadHasExclusiveAccess(false),
#endif
numExclusiveThreads(0),
numCompartments(0),
localeCallbacks(nullptr),
defaultLocale(nullptr),
defaultVersion_(JSVERSION_DEFAULT),
ownerThread_(js::ThisThread::GetId()),
ownerThreadNative_(0),
tempLifoAlloc(TEMP_LIFO_ALLOC_PRIMARY_CHUNK_SIZE),
jitRuntime_(nullptr),
selfHostingGlobal_(nullptr),
nativeStackBase(GetNativeStackBase()),
destroyCompartmentCallback(nullptr),
sizeOfIncludingThisCompartmentCallback(nullptr),
destroyZoneCallback(nullptr),
sweepZoneCallback(nullptr),
compartmentNameCallback(nullptr),
activityCallback(nullptr),
activityCallbackArg(nullptr),
requestDepth(0),
#ifdef DEBUG
checkRequestDepth(0),
#endif
gc(thisFromCtor()),
gcInitialized(false),
#ifdef JS_SIMULATOR
simulator_(nullptr),
#endif
scriptAndCountsVector(nullptr),
lcovOutput(),
NaNValue(DoubleNaNValue()),
negativeInfinityValue(DoubleValue(NegativeInfinity<double>())),
positiveInfinityValue(DoubleValue(PositiveInfinity<double>())),
emptyString(nullptr),
spsProfiler(thisFromCtor()),
profilingScripts(false),
suppressProfilerSampling(false),
hadOutOfMemory(false),
#if defined(DEBUG) || defined(JS_OOM_BREAKPOINT)
runningOOMTest(false),
#endif
allowRelazificationForTesting(false),
defaultFreeOp_(nullptr),
debuggerMutations(0),
securityCallbacks(&NullSecurityCallbacks),
DOMcallbacks(nullptr),
destroyPrincipals(nullptr),
readPrincipals(nullptr),
warningReporter(nullptr),
buildIdOp(nullptr),
propertyRemovals(0),
keepAtoms_(0),
trustedPrincipals_(nullptr),
beingDestroyed_(false),
atoms_(nullptr),
atomsCompartment_(nullptr),
staticStrings(nullptr),
commonNames(nullptr),
permanentAtoms(nullptr),
wellKnownSymbols(nullptr),
wrapObjectCallbacks(&DefaultWrapObjectCallbacks),
preserveWrapperCallback(nullptr),
jitSupportsFloatingPoint(false),
jitSupportsUnalignedAccesses(false),
jitSupportsSimd(false),
ionPcScriptCache(nullptr),
scriptEnvironmentPreparer(nullptr),
ctypesActivityCallback(nullptr),
windowProxyClass_(nullptr),
offthreadIonCompilationEnabled_(true),
parallelParsingEnabled_(true),
autoWritableJitCodeActive_(false),
#ifdef DEBUG
enteredPolicy(nullptr),
#endif
largeAllocationFailureCallback(nullptr),
oomCallback(nullptr),
debuggerMallocSizeOf(ReturnZeroSize),
lastAnimationTime(0),
performanceMonitoring(thisFromCtor()),
ionLazyLinkListSize_(0),
stackFormat_(parentRuntime ?
js::StackFormat::Default :
js::StackFormat::SpiderMonkey),
moduleResolveHook()
{
setGCStoreBufferPtr(&gc.storeBuffer);
liveRuntimesCount++;
/* Initialize infallibly first, so we can goto bad and JS_DestroyRuntime. */
JS_INIT_CLIST(&onNewGlobalObjectWatchers);
PodArrayZero(nativeStackQuota);
PodZero(&asmJSCacheOps);
lcovOutput.init();
}
bool
JSRuntime::init(uint32_t maxbytes, uint32_t maxNurseryBytes)
{
MOZ_ASSERT(ownerThread_ == js::ThisThread::GetId());
// Get a platform-native handle for the owner thread, used by
// js::InterruptRunningJitCode to halt the runtime's main thread.
#ifdef XP_WIN
size_t openFlags = THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME |
THREAD_QUERY_INFORMATION;
HANDLE self = OpenThread(openFlags, false, GetCurrentThreadId());
if (!self)
return false;
static_assert(sizeof(HANDLE) <= sizeof(ownerThreadNative_), "need bigger field");
ownerThreadNative_ = (size_t)self;
#else
static_assert(sizeof(pthread_t) <= sizeof(ownerThreadNative_), "need bigger field");
ownerThreadNative_ = (size_t)pthread_self();
#endif
if (!mainThread.init())
return false;
if (!regexpStack.init())
return false;
if (CanUseExtraThreads() && !EnsureHelperThreadsInitialized())
return false;
js::TlsPerThreadData.set(&mainThread);
defaultFreeOp_ = js_new<js::FreeOp>(this);
if (!defaultFreeOp_)
return false;
if (!gc.init(maxbytes, maxNurseryBytes))
return false;
ScopedJSDeletePtr<Zone> atomsZone(new_<Zone>(this));
if (!atomsZone || !atomsZone->init(true))
return false;
JS::CompartmentOptions options;
ScopedJSDeletePtr<JSCompartment> atomsCompartment(new_<JSCompartment>(atomsZone.get(), options));
if (!atomsCompartment || !atomsCompartment->init(nullptr))
return false;
if (!gc.zones.append(atomsZone.get()))
return false;
if (!atomsZone->compartments.append(atomsCompartment.get()))
return false;
atomsCompartment->setIsSystem(true);
atomsCompartment->setIsAtomsCompartment();
atomsZone.forget();
this->atomsCompartment_ = atomsCompartment.forget();
if (!symbolRegistry_.init())
return false;
if (!scriptDataTable_.init())
return false;
/* The garbage collector depends on everything before this point being initialized. */
gcInitialized = true;
InitRuntimeNumberState(this);
JS::ResetTimeZone();
#ifdef JS_SIMULATOR
simulator_ = js::jit::Simulator::Create(contextFromMainThread());
if (!simulator_)
return false;
#endif
jitSupportsFloatingPoint = js::jit::JitSupportsFloatingPoint();
jitSupportsUnalignedAccesses = js::jit::JitSupportsUnalignedAccesses();
jitSupportsSimd = js::jit::JitSupportsSimd();
if (!wasm::EnsureSignalHandlers(this))
return false;
if (!spsProfiler.init())
return false;
if (!fx.initInstance())
return false;
if (!parentRuntime) {
sharedImmutableStrings_ = js::SharedImmutableStringsCache::Create();
if (!sharedImmutableStrings_)
return false;
}
return true;
}
void
JSRuntime::destroyRuntime()
{
MOZ_ASSERT(!isHeapBusy());
MOZ_ASSERT(childRuntimeCount == 0);
fx.destroyInstance();
sharedIntlData.destroyInstance();
if (gcInitialized) {
/*
* Finish any in-progress GCs first. This ensures the parseWaitingOnGC
* list is empty in CancelOffThreadParses.
*/
JSContext* cx = contextFromMainThread();
if (JS::IsIncrementalGCInProgress(cx))
FinishGC(cx);
/* Free source hook early, as its destructor may want to delete roots. */
sourceHook = nullptr;
/*
* Cancel any pending, in progress or completed Ion compilations and
* parse tasks. Waiting for wasm and compression tasks is done
* synchronously (on the main thread or during parse tasks), so no
* explicit canceling is needed for these.
*/
CancelOffThreadIonCompile(this);
CancelOffThreadParses(this);
/* Remove persistent GC roots. */
gc.finishRoots();
/*
* Flag us as being destroyed. This allows the GC to free things like
* interned atoms and Ion trampolines.
*/
beingDestroyed_ = true;
/* Allow the GC to release scripts that were being profiled. */
profilingScripts = false;
/* Set the profiler sampler buffer generation to invalid. */
profilerSampleBufferGen_ = UINT32_MAX;
JS::PrepareForFullGC(contextFromMainThread());
gc.gc(GC_NORMAL, JS::gcreason::DESTROY_RUNTIME);
}
MOZ_ASSERT(ionLazyLinkListSize_ == 0);
MOZ_ASSERT(ionLazyLinkList_.isEmpty());
MOZ_ASSERT(!numExclusiveThreads);
AutoLockForExclusiveAccess lock(this);
/*
* Even though all objects in the compartment are dead, we may have keep
* some filenames around because of gcKeepAtoms.
*/
FreeScriptData(this, lock);
gc.finish();
atomsCompartment_ = nullptr;
js_delete(defaultFreeOp_);
js_free(defaultLocale);
js_delete(jitRuntime_);
js_delete(ionPcScriptCache);
gc.storeBuffer.disable();
gc.nursery.disable();
#ifdef JS_SIMULATOR
js::jit::Simulator::Destroy(simulator_);
#endif
DebugOnly<size_t> oldCount = liveRuntimesCount--;
MOZ_ASSERT(oldCount > 0);
#ifdef JS_TRACE_LOGGING
DestroyTraceLoggerMainThread(this);
#endif
js::TlsPerThreadData.set(nullptr);
#ifdef XP_WIN
if (ownerThreadNative_)
CloseHandle((HANDLE)ownerThreadNative_);
#endif
}
void
JSRuntime::addSizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf, JS::RuntimeSizes* rtSizes)
{
// Several tables in the runtime enumerated below can be used off thread.
AutoLockForExclusiveAccess lock(this);
// For now, measure the size of the derived class (JSContext).
// TODO (bug 1281529): make memory reporting reflect the new
// JSContext/JSRuntime world better.
JSContext* cx = unsafeContextFromAnyThread();
rtSizes->object += mallocSizeOf(cx);
rtSizes->atomsTable += atoms(lock).sizeOfIncludingThis(mallocSizeOf);
if (!parentRuntime) {
rtSizes->atomsTable += mallocSizeOf(staticStrings);
rtSizes->atomsTable += mallocSizeOf(commonNames);
rtSizes->atomsTable += permanentAtoms->sizeOfIncludingThis(mallocSizeOf);
}
rtSizes->contexts += cx->sizeOfExcludingThis(mallocSizeOf);
rtSizes->temporary += tempLifoAlloc.sizeOfExcludingThis(mallocSizeOf);
rtSizes->interpreterStack += interpreterStack_.sizeOfExcludingThis(mallocSizeOf);
if (MathCache* cache = cx->caches.maybeGetMathCache())
rtSizes->mathCache += cache->sizeOfIncludingThis(mallocSizeOf);
if (sharedImmutableStrings_) {
rtSizes->sharedImmutableStringsCache +=
sharedImmutableStrings_->sizeOfExcludingThis(mallocSizeOf);
}
rtSizes->sharedIntlData += sharedIntlData.sizeOfExcludingThis(mallocSizeOf);
rtSizes->uncompressedSourceCache +=
cx->caches.uncompressedSourceCache.sizeOfExcludingThis(mallocSizeOf);
rtSizes->scriptData += scriptDataTable(lock).sizeOfExcludingThis(mallocSizeOf);
for (ScriptDataTable::Range r = scriptDataTable(lock).all(); !r.empty(); r.popFront())
rtSizes->scriptData += mallocSizeOf(r.front());
if (jitRuntime_) {
jitRuntime_->execAlloc().addSizeOfCode(&rtSizes->code);
jitRuntime_->backedgeExecAlloc().addSizeOfCode(&rtSizes->code);
}
rtSizes->gc.marker += gc.marker.sizeOfExcludingThis(mallocSizeOf);
rtSizes->gc.nurseryCommitted += gc.nursery.sizeOfHeapCommitted();
rtSizes->gc.nurseryMallocedBuffers += gc.nursery.sizeOfMallocedBuffers(mallocSizeOf);
gc.storeBuffer.addSizeOfExcludingThis(mallocSizeOf, &rtSizes->gc);
}
static bool
InvokeInterruptCallback(JSContext* cx)
{
MOZ_ASSERT(cx->runtime()->requestDepth >= 1);
cx->runtime()->gc.gcIfRequested();
// A worker thread may have requested an interrupt after finishing an Ion
// compilation.
jit::AttachFinishedCompilations(cx);
// Important: Additional callbacks can occur inside the callback handler
// if it re-enters the JS engine. The embedding must ensure that the
// callback is disconnected before attempting such re-entry.
if (cx->runtime()->interruptCallbackDisabled)
return true;
bool stop = false;
for (JSInterruptCallback cb : cx->runtime()->interruptCallbacks) {
if (!cb(cx))
stop = true;
}
if (!stop) {
// Debugger treats invoking the interrupt callback as a "step", so
// invoke the onStep handler.
if (cx->compartment()->isDebuggee()) {
ScriptFrameIter iter(cx);
if (!iter.done() &&
cx->compartment() == iter.compartment() &&
iter.script()->stepModeEnabled())
{
RootedValue rval(cx);
switch (Debugger::onSingleStep(cx, &rval)) {
case JSTRAP_ERROR:
return false;
case JSTRAP_CONTINUE:
return true;
case JSTRAP_RETURN:
// See note in Debugger::propagateForcedReturn.
Debugger::propagateForcedReturn(cx, iter.abstractFramePtr(), rval);
return false;
case JSTRAP_THROW:
cx->setPendingException(rval);
return false;
default:;
}
}
}
return true;
}
// No need to set aside any pending exception here: ComputeStackString
// already does that.
JSString* stack = ComputeStackString(cx);
JSFlatString* flat = stack ? stack->ensureFlat(cx) : nullptr;
const char16_t* chars;
AutoStableStringChars stableChars(cx);
if (flat && stableChars.initTwoByte(cx, flat))
chars = stableChars.twoByteRange().begin().get();
else
chars = u"(stack not available)";
JS_ReportErrorFlagsAndNumberUC(cx, JSREPORT_WARNING, GetErrorMessage, nullptr,
JSMSG_TERMINATED, chars);
return false;
}
void
JSRuntime::requestInterrupt(InterruptMode mode)
{
interrupt_ = true;
jitStackLimit_ = UINTPTR_MAX;
if (mode == JSRuntime::RequestInterruptUrgent) {
// If this interrupt is urgent (slow script dialog and garbage
// collection among others), take additional steps to
// interrupt corner cases where the above fields are not
// regularly polled. Wake both ilooping JIT code and
// Atomics.wait().
fx.lock();
if (fx.isWaiting())
fx.notify(FutexRuntime::NotifyForJSInterrupt);
fx.unlock();
InterruptRunningJitCode(this);
}
}
bool
JSRuntime::handleInterrupt(JSContext* cx)
{
MOZ_ASSERT(CurrentThreadCanAccessRuntime(cx->runtime()));
if (interrupt_ || jitStackLimit_ == UINTPTR_MAX) {
interrupt_ = false;
cx->resetJitStackLimit();
return InvokeInterruptCallback(cx);
}
return true;
}
bool
JSRuntime::setDefaultLocale(const char* locale)
{
if (!locale)
return false;
resetDefaultLocale();
defaultLocale = JS_strdup(contextFromMainThread(), locale);
return defaultLocale != nullptr;
}
void
JSRuntime::resetDefaultLocale()
{
js_free(defaultLocale);
defaultLocale = nullptr;
}
const char*
JSRuntime::getDefaultLocale()
{
if (defaultLocale)
return defaultLocale;
const char* locale;
#ifdef HAVE_SETLOCALE
locale = setlocale(LC_ALL, nullptr);
#else
locale = getenv("LANG");
#endif
// convert to a well-formed BCP 47 language tag
if (!locale || !strcmp(locale, "C"))
locale = "und";
char* lang = JS_strdup(contextFromMainThread(), locale);
if (!lang)
return nullptr;
char* p;
if ((p = strchr(lang, '.')))
*p = '\0';
while ((p = strchr(lang, '_')))
*p = '-';
defaultLocale = lang;
return defaultLocale;
}
void
JSRuntime::traceSharedIntlData(JSTracer* trc)
{
sharedIntlData.trace(trc);
}
void
JSRuntime::triggerActivityCallback(bool active)
{
if (!activityCallback)
return;
/*
* The activity callback must not trigger a GC: it would create a cirular
* dependency between entering a request and Rooted's requirement of being
* in a request. In practice this callback already cannot trigger GC. The
* suppression serves to inform the exact rooting hazard analysis of this
* property and ensures that it remains true in the future.
*/
AutoSuppressGC suppress(contextFromMainThread());
activityCallback(activityCallbackArg, active);
}
FreeOp::FreeOp(JSRuntime* maybeRuntime)
: JSFreeOp(maybeRuntime)
{
MOZ_ASSERT_IF(maybeRuntime, CurrentThreadCanAccessRuntime(maybeRuntime));
}
FreeOp::~FreeOp()
{
for (size_t i = 0; i < freeLaterList.length(); i++)
free_(freeLaterList[i]);
if (!jitPoisonRanges.empty())
jit::ExecutableAllocator::poisonCode(runtime(), jitPoisonRanges);
}
bool
FreeOp::isDefaultFreeOp() const
{
return runtime_ && runtime_->defaultFreeOp() == this;
}
JSObject*
JSRuntime::getIncumbentGlobal(JSContext* cx)
{
MOZ_ASSERT(cx->runtime()->getIncumbentGlobalCallback,
"Must set a callback using JS_SetGetIncumbentGlobalCallback before using Promises");
return cx->runtime()->getIncumbentGlobalCallback(cx);
}
bool
JSRuntime::enqueuePromiseJob(JSContext* cx, HandleFunction job, HandleObject promise,
HandleObject incumbentGlobal)
{
MOZ_ASSERT(cx->runtime()->enqueuePromiseJobCallback,
"Must set a callback using JS_SetEnqeueuPromiseJobCallback before using Promises");
MOZ_ASSERT_IF(incumbentGlobal, !IsWrapper(incumbentGlobal) && !IsWindowProxy(incumbentGlobal));
void* data = cx->runtime()->enqueuePromiseJobCallbackData;
RootedObject allocationSite(cx);
if (promise) {
RootedObject unwrappedPromise(cx, promise);
// While the job object is guaranteed to be unwrapped, the promise
// might be wrapped. See the comments in
// intrinsic_EnqueuePromiseReactionJob for details.
if (IsWrapper(promise))
unwrappedPromise = UncheckedUnwrap(promise);
if (unwrappedPromise->is<PromiseObject>())
allocationSite = JS::GetPromiseAllocationSite(unwrappedPromise);
}
return cx->runtime()->enqueuePromiseJobCallback(cx, job, allocationSite, incumbentGlobal, data);
}
void
JSRuntime::addUnhandledRejectedPromise(JSContext* cx, js::HandleObject promise)
{
MOZ_ASSERT(promise->is<PromiseObject>());
if (!cx->runtime()->promiseRejectionTrackerCallback)
return;
void* data = cx->runtime()->promiseRejectionTrackerCallbackData;
cx->runtime()->promiseRejectionTrackerCallback(cx, promise,
PromiseRejectionHandlingState::Unhandled, data);
}
void
JSRuntime::removeUnhandledRejectedPromise(JSContext* cx, js::HandleObject promise)
{
MOZ_ASSERT(promise->is<PromiseObject>());
if (!cx->runtime()->promiseRejectionTrackerCallback)
return;
void* data = cx->runtime()->promiseRejectionTrackerCallbackData;
cx->runtime()->promiseRejectionTrackerCallback(cx, promise,
PromiseRejectionHandlingState::Handled, data);
}
mozilla::non_crypto::XorShift128PlusRNG&
JSRuntime::randomKeyGenerator()
{
MOZ_ASSERT(CurrentThreadCanAccessRuntime(this));
if (randomKeyGenerator_.isNothing()) {
mozilla::Array<uint64_t, 2> seed;
GenerateXorShift128PlusSeed(seed);
randomKeyGenerator_.emplace(seed[0], seed[1]);
}
return randomKeyGenerator_.ref();
}
mozilla::HashCodeScrambler
JSRuntime::randomHashCodeScrambler()
{
auto& rng = randomKeyGenerator();
return mozilla::HashCodeScrambler(rng.next(), rng.next());
}
mozilla::non_crypto::XorShift128PlusRNG
JSRuntime::forkRandomKeyGenerator()
{
auto& rng = randomKeyGenerator();
return mozilla::non_crypto::XorShift128PlusRNG(rng.next(), rng.next());
}
void
JSRuntime::updateMallocCounter(size_t nbytes)
{
updateMallocCounter(nullptr, nbytes);
}
void
JSRuntime::updateMallocCounter(JS::Zone* zone, size_t nbytes)
{
gc.updateMallocCounter(zone, nbytes);
}
JS_FRIEND_API(void*)
JSRuntime::onOutOfMemory(AllocFunction allocFunc, size_t nbytes, void* reallocPtr,
JSContext* maybecx)
{
MOZ_ASSERT_IF(allocFunc != AllocFunction::Realloc, !reallocPtr);
MOZ_ASSERT(CurrentThreadCanAccessRuntime(this));
if (isHeapBusy())
return nullptr;
if (!oom::IsSimulatedOOMAllocation()) {
/*
* Retry when we are done with the background sweeping and have stopped
* all the allocations and released the empty GC chunks.
*/
gc.onOutOfMallocMemory();
void* p;
switch (allocFunc) {
case AllocFunction::Malloc:
p = js_malloc(nbytes);
break;
case AllocFunction::Calloc:
p = js_calloc(nbytes);
break;
case AllocFunction::Realloc:
p = js_realloc(reallocPtr, nbytes);
break;
default:
MOZ_CRASH();
}
if (p)
return p;
}
if (maybecx)
ReportOutOfMemory(maybecx);
return nullptr;
}
void*
JSRuntime::onOutOfMemoryCanGC(AllocFunction allocFunc, size_t bytes, void* reallocPtr)
{
if (largeAllocationFailureCallback && bytes >= LARGE_ALLOCATION)
largeAllocationFailureCallback(largeAllocationFailureCallbackData);
return onOutOfMemory(allocFunc, bytes, reallocPtr);
}
bool
JSRuntime::activeGCInAtomsZone()
{
Zone* zone = atomsCompartment_->zone();
return zone->needsIncrementalBarrier() || zone->wasGCStarted();
}
void
JSRuntime::setUsedByExclusiveThread(Zone* zone)
{
MOZ_ASSERT(!zone->usedByExclusiveThread);
zone->usedByExclusiveThread = true;
numExclusiveThreads++;
}
void
JSRuntime::clearUsedByExclusiveThread(Zone* zone)
{
MOZ_ASSERT(zone->usedByExclusiveThread);
zone->usedByExclusiveThread = false;
numExclusiveThreads--;
if (gc.fullGCForAtomsRequested() && !keepAtoms())
gc.triggerFullGCForAtoms();
}
bool
js::CurrentThreadCanAccessRuntime(const JSRuntime* rt)
{
return rt->ownerThread_ == js::ThisThread::GetId();
}
bool
js::CurrentThreadCanAccessZone(Zone* zone)
{
if (CurrentThreadCanAccessRuntime(zone->runtime_))
return true;
// Only zones in use by an exclusive thread can be used off the main thread.
// We don't keep track of which thread owns such zones though, so this check
// is imperfect.
return zone->usedByExclusiveThread;
}
#ifdef DEBUG
bool
js::CurrentThreadIsPerformingGC()
{
return TlsPerThreadData.get()->performingGC;
}
#endif
JS_FRIEND_API(void)
JS::UpdateJSContextProfilerSampleBufferGen(JSContext* cx, uint32_t generation,
uint32_t lapCount)
{
cx->setProfilerSampleBufferGen(generation);
cx->updateProfilerSampleBufferLapCount(lapCount);
}
JS_FRIEND_API(bool)
JS::IsProfilingEnabledForContext(JSContext* cx)
{
MOZ_ASSERT(cx);
return cx->spsProfiler.enabled();
}
JSRuntime::IonBuilderList&
JSRuntime::ionLazyLinkList()
{
MOZ_ASSERT(TlsPerThreadData.get()->runtimeFromMainThread(),
"Should only be mutated by the main thread.");
return ionLazyLinkList_;
}
void
JSRuntime::ionLazyLinkListRemove(jit::IonBuilder* builder)
{
MOZ_ASSERT(TlsPerThreadData.get()->runtimeFromMainThread(),
"Should only be mutated by the main thread.");
MOZ_ASSERT(ionLazyLinkListSize_ > 0);
builder->removeFrom(ionLazyLinkList());
ionLazyLinkListSize_--;
MOZ_ASSERT(ionLazyLinkList().isEmpty() == (ionLazyLinkListSize_ == 0));
}
void
JSRuntime::ionLazyLinkListAdd(jit::IonBuilder* builder)
{
MOZ_ASSERT(TlsPerThreadData.get()->runtimeFromMainThread(),
"Should only be mutated by the main thread.");
ionLazyLinkList().insertFront(builder);
ionLazyLinkListSize_++;
}
JSContext*
PerThreadData::contextFromMainThread()
{
return runtime_->contextFromMainThread();
}
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