mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-26 23:54:56 +00:00
924 lines
25 KiB
C++
924 lines
25 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "vm/Runtime-inl.h"
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/Atomics.h"
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#include "mozilla/DebugOnly.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/ThreadLocal.h"
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#if defined(XP_DARWIN)
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#include <mach/mach.h>
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#elif defined(XP_UNIX)
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#include <sys/resource.h>
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#elif defined(XP_WIN)
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#include <processthreadsapi.h>
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#include <windows.h>
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#endif // defined(XP_DARWIN) || defined(XP_UNIX) || defined(XP_WIN)
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#include <locale.h>
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#include <string.h>
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#ifdef JS_CAN_CHECK_THREADSAFE_ACCESSES
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# include <sys/mman.h>
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#endif
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#include "jsatom.h"
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#include "jsdtoa.h"
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#include "jsgc.h"
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#include "jsmath.h"
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#include "jsnativestack.h"
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#include "jsobj.h"
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#include "jsscript.h"
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#include "jswatchpoint.h"
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#include "jswin.h"
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#include "jswrapper.h"
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#include "asmjs/AsmJSSignalHandlers.h"
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#include "jit/arm/Simulator-arm.h"
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#include "jit/arm64/vixl/Simulator-vixl.h"
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#include "jit/JitCompartment.h"
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#include "jit/mips32/Simulator-mips32.h"
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#include "jit/mips64/Simulator-mips64.h"
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#include "jit/PcScriptCache.h"
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#include "js/Date.h"
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#include "js/MemoryMetrics.h"
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#include "js/SliceBudget.h"
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#include "vm/Debugger.h"
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#include "jscntxtinlines.h"
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#include "jsgcinlines.h"
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using namespace js;
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using namespace js::gc;
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using mozilla::Atomic;
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using mozilla::DebugOnly;
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using mozilla::NegativeInfinity;
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using mozilla::PodZero;
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using mozilla::PodArrayZero;
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using mozilla::PositiveInfinity;
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using mozilla::ThreadLocal;
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using JS::GenericNaN;
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using JS::DoubleNaNValue;
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/* static */ ThreadLocal<PerThreadData*> js::TlsPerThreadData;
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/* static */ Atomic<size_t> JSRuntime::liveRuntimesCount;
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namespace js {
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bool gCanUseExtraThreads = true;
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} // namespace js
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void
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js::DisableExtraThreads()
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{
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gCanUseExtraThreads = false;
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}
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const JSSecurityCallbacks js::NullSecurityCallbacks = { };
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PerThreadData::PerThreadData(JSRuntime* runtime)
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: PerThreadDataFriendFields(),
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runtime_(runtime),
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#ifdef JS_TRACE_LOGGING
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traceLogger(nullptr),
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#endif
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autoFlushICache_(nullptr),
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dtoaState(nullptr),
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suppressGC(0),
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#ifdef DEBUG
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ionCompiling(false),
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ionCompilingSafeForMinorGC(false),
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gcSweeping(false),
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#endif
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activeCompilations(0)
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{}
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PerThreadData::~PerThreadData()
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{
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if (dtoaState)
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DestroyDtoaState(dtoaState);
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}
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bool
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PerThreadData::init()
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{
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dtoaState = NewDtoaState();
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if (!dtoaState)
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return false;
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return true;
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}
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static const JSWrapObjectCallbacks DefaultWrapObjectCallbacks = {
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TransparentObjectWrapper,
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nullptr
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};
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static size_t
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ReturnZeroSize(const void* p)
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{
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return 0;
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}
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JSRuntime::JSRuntime(JSRuntime* parentRuntime)
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: mainThread(this),
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jitTop(nullptr),
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jitJSContext(nullptr),
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jitActivation(nullptr),
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jitStackLimit_(0xbad),
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jitStackLimitNoInterrupt_(0xbad),
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activation_(nullptr),
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profilingActivation_(nullptr),
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profilerSampleBufferGen_(0),
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profilerSampleBufferLapCount_(1),
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asmJSActivationStack_(nullptr),
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asyncStackForNewActivations(this),
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asyncCauseForNewActivations(this),
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asyncCallIsExplicit(false),
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entryMonitor(nullptr),
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parentRuntime(parentRuntime),
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interrupt_(false),
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interruptRegExpJit_(false),
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telemetryCallback(nullptr),
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handlingSignal(false),
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interruptCallback(nullptr),
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exclusiveAccessLock(nullptr),
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exclusiveAccessOwner(nullptr),
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mainThreadHasExclusiveAccess(false),
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numExclusiveThreads(0),
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numCompartments(0),
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localeCallbacks(nullptr),
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defaultLocale(nullptr),
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defaultVersion_(JSVERSION_DEFAULT),
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ownerThread_(nullptr),
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ownerThreadNative_(0),
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tempLifoAlloc(TEMP_LIFO_ALLOC_PRIMARY_CHUNK_SIZE),
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jitRuntime_(nullptr),
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selfHostingGlobal_(nullptr),
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nativeStackBase(GetNativeStackBase()),
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cxCallback(nullptr),
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destroyCompartmentCallback(nullptr),
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destroyZoneCallback(nullptr),
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sweepZoneCallback(nullptr),
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compartmentNameCallback(nullptr),
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activityCallback(nullptr),
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activityCallbackArg(nullptr),
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requestDepth(0),
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#ifdef DEBUG
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checkRequestDepth(0),
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activeContext(nullptr),
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#endif
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gc(thisFromCtor()),
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gcInitialized(false),
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#ifdef JS_SIMULATOR
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simulator_(nullptr),
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#endif
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scriptAndCountsVector(nullptr),
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lcovOutput(),
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NaNValue(DoubleNaNValue()),
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negativeInfinityValue(DoubleValue(NegativeInfinity<double>())),
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positiveInfinityValue(DoubleValue(PositiveInfinity<double>())),
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emptyString(nullptr),
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spsProfiler(thisFromCtor()),
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profilingScripts(false),
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suppressProfilerSampling(false),
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hadOutOfMemory(false),
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haveCreatedContext(false),
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allowRelazificationForTesting(false),
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data(nullptr),
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signalHandlersInstalled_(false),
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canUseSignalHandlers_(false),
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defaultFreeOp_(thisFromCtor()),
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debuggerMutations(0),
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securityCallbacks(const_cast<JSSecurityCallbacks*>(&NullSecurityCallbacks)),
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DOMcallbacks(nullptr),
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destroyPrincipals(nullptr),
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readPrincipals(nullptr),
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errorReporter(nullptr),
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linkedAsmJSModules(nullptr),
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propertyRemovals(0),
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#if !EXPOSE_INTL_API
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thousandsSeparator(0),
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decimalSeparator(0),
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numGrouping(0),
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#endif
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mathCache_(nullptr),
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activeCompilations_(0),
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keepAtoms_(0),
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trustedPrincipals_(nullptr),
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beingDestroyed_(false),
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atoms_(nullptr),
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atomsCompartment_(nullptr),
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staticStrings(nullptr),
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commonNames(nullptr),
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permanentAtoms(nullptr),
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wellKnownSymbols(nullptr),
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wrapObjectCallbacks(&DefaultWrapObjectCallbacks),
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preserveWrapperCallback(nullptr),
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jitSupportsFloatingPoint(false),
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jitSupportsSimd(false),
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ionPcScriptCache(nullptr),
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scriptEnvironmentPreparer(nullptr),
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ctypesActivityCallback(nullptr),
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windowProxyClass_(nullptr),
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offthreadIonCompilationEnabled_(true),
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parallelParsingEnabled_(true),
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autoWritableJitCodeActive_(false),
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#ifdef DEBUG
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enteredPolicy(nullptr),
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#endif
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largeAllocationFailureCallback(nullptr),
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oomCallback(nullptr),
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debuggerMallocSizeOf(ReturnZeroSize),
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lastAnimationTime(0),
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performanceMonitoring(thisFromCtor())
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{
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setGCStoreBufferPtr(&gc.storeBuffer);
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liveRuntimesCount++;
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/* Initialize infallibly first, so we can goto bad and JS_DestroyRuntime. */
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JS_INIT_CLIST(&onNewGlobalObjectWatchers);
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PodArrayZero(nativeStackQuota);
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PodZero(&asmJSCacheOps);
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lcovOutput.init();
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}
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static bool
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SignalBasedTriggersDisabled()
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{
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// Don't bother trying to cache the getenv lookup; this should be called
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// infrequently.
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return !!getenv("JS_DISABLE_SLOW_SCRIPT_SIGNALS") || !!getenv("JS_NO_SIGNALS");
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}
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bool
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JSRuntime::init(uint32_t maxbytes, uint32_t maxNurseryBytes)
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{
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ownerThread_ = PR_GetCurrentThread();
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// Get a platform-native handle for the owner thread, used by
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// js::InterruptRunningJitCode to halt the runtime's main thread.
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#ifdef XP_WIN
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size_t openFlags = THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME |
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THREAD_QUERY_INFORMATION;
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HANDLE self = OpenThread(openFlags, false, GetCurrentThreadId());
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if (!self)
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return false;
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static_assert(sizeof(HANDLE) <= sizeof(ownerThreadNative_), "need bigger field");
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ownerThreadNative_ = (size_t)self;
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#else
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static_assert(sizeof(pthread_t) <= sizeof(ownerThreadNative_), "need bigger field");
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ownerThreadNative_ = (size_t)pthread_self();
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#endif
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exclusiveAccessLock = PR_NewLock();
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if (!exclusiveAccessLock)
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return false;
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if (!mainThread.init())
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return false;
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if (!regexpStack.init())
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return false;
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if (CanUseExtraThreads() && !EnsureHelperThreadsInitialized())
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return false;
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js::TlsPerThreadData.set(&mainThread);
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if (!gc.init(maxbytes, maxNurseryBytes))
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return false;
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ScopedJSDeletePtr<Zone> atomsZone(new_<Zone>(this));
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if (!atomsZone || !atomsZone->init(true))
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return false;
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JS::CompartmentOptions options;
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ScopedJSDeletePtr<JSCompartment> atomsCompartment(new_<JSCompartment>(atomsZone.get(), options));
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if (!atomsCompartment || !atomsCompartment->init(nullptr))
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return false;
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if (!gc.zones.append(atomsZone.get()))
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return false;
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if (!atomsZone->compartments.append(atomsCompartment.get()))
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return false;
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atomsCompartment->setIsSystem(true);
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atomsCompartment->setIsAtomsCompartment();
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atomsZone.forget();
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this->atomsCompartment_ = atomsCompartment.forget();
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if (!symbolRegistry_.init())
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return false;
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if (!scriptDataTable_.init())
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return false;
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if (!evalCache.init())
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return false;
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if (!compressedSourceSet.init())
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return false;
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/* The garbage collector depends on everything before this point being initialized. */
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gcInitialized = true;
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if (!InitRuntimeNumberState(this))
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return false;
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JS::ResetTimeZone();
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#ifdef JS_SIMULATOR
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simulator_ = js::jit::Simulator::Create();
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if (!simulator_)
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return false;
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#endif
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jitSupportsFloatingPoint = js::jit::JitSupportsFloatingPoint();
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jitSupportsSimd = js::jit::JitSupportsSimd();
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signalHandlersInstalled_ = EnsureSignalHandlersInstalled(this);
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canUseSignalHandlers_ = signalHandlersInstalled_ && !SignalBasedTriggersDisabled();
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if (!spsProfiler.init())
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return false;
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if (!fx.initInstance())
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return false;
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return true;
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}
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JSRuntime::~JSRuntime()
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{
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MOZ_ASSERT(!isHeapBusy());
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fx.destroyInstance();
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if (gcInitialized) {
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/* Free source hook early, as its destructor may want to delete roots. */
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sourceHook = nullptr;
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/*
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* Cancel any pending, in progress or completed Ion compilations and
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* parse tasks. Waiting for AsmJS and compression tasks is done
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* synchronously (on the main thread or during parse tasks), so no
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* explicit canceling is needed for these.
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*/
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for (CompartmentsIter comp(this, SkipAtoms); !comp.done(); comp.next())
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CancelOffThreadIonCompile(comp, nullptr);
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CancelOffThreadParses(this);
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/* Clear debugging state to remove GC roots. */
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for (CompartmentsIter comp(this, SkipAtoms); !comp.done(); comp.next()) {
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if (WatchpointMap* wpmap = comp->watchpointMap)
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wpmap->clear();
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}
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/*
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* Clear script counts map, to remove the strong reference on the
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* JSScript key.
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*/
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for (CompartmentsIter comp(this, SkipAtoms); !comp.done(); comp.next())
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comp->clearScriptCounts();
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/* Clear atoms to remove GC roots and heap allocations. */
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finishAtoms();
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/* Remove persistent GC roots. */
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gc.finishRoots();
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/*
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* Flag us as being destroyed. This allows the GC to free things like
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* interned atoms and Ion trampolines.
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*/
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beingDestroyed_ = true;
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/* Allow the GC to release scripts that were being profiled. */
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profilingScripts = false;
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/* Set the profiler sampler buffer generation to invalid. */
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profilerSampleBufferGen_ = UINT32_MAX;
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JS::PrepareForFullGC(this);
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gc.gc(GC_NORMAL, JS::gcreason::DESTROY_RUNTIME);
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}
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/*
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* Clear the self-hosted global and delete self-hosted classes *after*
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* GC, as finalizers for objects check for clasp->finalize during GC.
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*/
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finishSelfHosting();
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MOZ_ASSERT(!exclusiveAccessOwner);
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if (exclusiveAccessLock)
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PR_DestroyLock(exclusiveAccessLock);
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// Avoid bogus asserts during teardown.
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MOZ_ASSERT(!numExclusiveThreads);
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mainThreadHasExclusiveAccess = true;
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/*
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* Even though all objects in the compartment are dead, we may have keep
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* some filenames around because of gcKeepAtoms.
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*/
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FreeScriptData(this);
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#ifdef DEBUG
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/* Don't hurt everyone in leaky ol' Mozilla with a fatal MOZ_ASSERT! */
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if (hasContexts()) {
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unsigned cxcount = 0;
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for (ContextIter acx(this); !acx.done(); acx.next()) {
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fprintf(stderr,
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"JS API usage error: found live context at %p\n",
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(void*) acx.get());
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cxcount++;
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}
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fprintf(stderr,
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"JS API usage error: %u context%s left in runtime upon JS_DestroyRuntime.\n",
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cxcount, (cxcount == 1) ? "" : "s");
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}
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#endif
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#if !EXPOSE_INTL_API
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FinishRuntimeNumberState(this);
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#endif
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gc.finish();
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atomsCompartment_ = nullptr;
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js_free(defaultLocale);
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js_delete(mathCache_);
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js_delete(jitRuntime_);
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js_delete(ionPcScriptCache);
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gc.storeBuffer.disable();
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gc.nursery.disable();
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#ifdef JS_SIMULATOR
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js::jit::Simulator::Destroy(simulator_);
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#endif
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DebugOnly<size_t> oldCount = liveRuntimesCount--;
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MOZ_ASSERT(oldCount > 0);
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js::TlsPerThreadData.set(nullptr);
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#ifdef XP_WIN
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if (ownerThreadNative_)
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CloseHandle((HANDLE)ownerThreadNative_);
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#endif
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}
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void
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JSRuntime::addTelemetry(int id, uint32_t sample, const char* key)
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{
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if (telemetryCallback)
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(*telemetryCallback)(id, sample, key);
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}
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void
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JSRuntime::setTelemetryCallback(JSRuntime* rt, JSAccumulateTelemetryDataCallback callback)
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{
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rt->telemetryCallback = callback;
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}
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void
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NewObjectCache::clearNurseryObjects(JSRuntime* rt)
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{
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for (unsigned i = 0; i < mozilla::ArrayLength(entries); ++i) {
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Entry& e = entries[i];
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NativeObject* obj = reinterpret_cast<NativeObject*>(&e.templateObject);
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if (IsInsideNursery(e.key) ||
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rt->gc.nursery.isInside(obj->slots_) ||
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rt->gc.nursery.isInside(obj->elements_))
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{
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PodZero(&e);
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}
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}
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}
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void
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JSRuntime::addSizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf, JS::RuntimeSizes* rtSizes)
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{
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// Several tables in the runtime enumerated below can be used off thread.
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AutoLockForExclusiveAccess lock(this);
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rtSizes->object += mallocSizeOf(this);
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rtSizes->atomsTable += atoms().sizeOfIncludingThis(mallocSizeOf);
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if (!parentRuntime) {
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rtSizes->atomsTable += mallocSizeOf(staticStrings);
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rtSizes->atomsTable += mallocSizeOf(commonNames);
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rtSizes->atomsTable += permanentAtoms->sizeOfIncludingThis(mallocSizeOf);
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}
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for (ContextIter acx(this); !acx.done(); acx.next())
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rtSizes->contexts += acx->sizeOfIncludingThis(mallocSizeOf);
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rtSizes->dtoa += mallocSizeOf(mainThread.dtoaState);
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rtSizes->temporary += tempLifoAlloc.sizeOfExcludingThis(mallocSizeOf);
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rtSizes->interpreterStack += interpreterStack_.sizeOfExcludingThis(mallocSizeOf);
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rtSizes->mathCache += mathCache_ ? mathCache_->sizeOfIncludingThis(mallocSizeOf) : 0;
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|
|
rtSizes->uncompressedSourceCache += uncompressedSourceCache.sizeOfExcludingThis(mallocSizeOf);
|
|
|
|
rtSizes->compressedSourceSet += compressedSourceSet.sizeOfExcludingThis(mallocSizeOf);
|
|
|
|
rtSizes->scriptData += scriptDataTable().sizeOfExcludingThis(mallocSizeOf);
|
|
for (ScriptDataTable::Range r = scriptDataTable().all(); !r.empty(); r.popFront())
|
|
rtSizes->scriptData += mallocSizeOf(r.front());
|
|
|
|
if (jitRuntime_)
|
|
jitRuntime_->execAlloc().addSizeOfCode(&rtSizes->code);
|
|
|
|
rtSizes->gc.marker += gc.marker.sizeOfExcludingThis(mallocSizeOf);
|
|
rtSizes->gc.nurseryCommitted += gc.nursery.sizeOfHeapCommitted();
|
|
rtSizes->gc.nurseryDecommitted += gc.nursery.sizeOfHeapDecommitted();
|
|
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.
|
|
JSInterruptCallback cb = cx->runtime()->interruptCallback;
|
|
if (!cb)
|
|
return true;
|
|
|
|
if (cb(cx)) {
|
|
// Debugger treats invoking the interrupt callback as a "step", so
|
|
// invoke the onStep handler.
|
|
if (cx->compartment()->isDebuggee()) {
|
|
ScriptFrameIter iter(cx);
|
|
if (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().start().get();
|
|
else
|
|
chars = MOZ_UTF16("(stack not available)");
|
|
JS_ReportErrorFlagsAndNumberUC(cx, JSREPORT_WARNING, GetErrorMessage, nullptr,
|
|
JSMSG_TERMINATED, chars);
|
|
|
|
return false;
|
|
}
|
|
|
|
void
|
|
JSRuntime::resetJitStackLimit()
|
|
{
|
|
// Note that, for now, we use the untrusted limit for ion. This is fine,
|
|
// because it's the most conservative limit, and if we hit it, we'll bail
|
|
// out of ion into the interpreter, which will do a proper recursion check.
|
|
#ifdef JS_SIMULATOR
|
|
jitStackLimit_ = jit::Simulator::StackLimit();
|
|
#else
|
|
jitStackLimit_ = mainThread.nativeStackLimit[StackForUntrustedScript];
|
|
#endif
|
|
jitStackLimitNoInterrupt_ = jitStackLimit_;
|
|
}
|
|
|
|
void
|
|
JSRuntime::initJitStackLimit()
|
|
{
|
|
resetJitStackLimit();
|
|
}
|
|
|
|
void
|
|
JSRuntime::requestInterrupt(InterruptMode mode)
|
|
{
|
|
interrupt_ = true;
|
|
jitStackLimit_ = UINTPTR_MAX;
|
|
|
|
if (mode == JSRuntime::RequestInterruptUrgent) {
|
|
// If this interrupt is urgent (slow script dialog for instance), take
|
|
// additional steps to interrupt corner cases where the above fields are
|
|
// not regularly polled. Wake ilooping Ion code, irregexp JIT code and
|
|
// Atomics.wait()
|
|
interruptRegExpJit_ = true;
|
|
fx.lock();
|
|
if (fx.isWaiting())
|
|
fx.wake(FutexRuntime::WakeForJSInterrupt);
|
|
fx.unlock();
|
|
InterruptRunningJitCode(this);
|
|
}
|
|
}
|
|
|
|
bool
|
|
JSRuntime::handleInterrupt(JSContext* cx)
|
|
{
|
|
MOZ_ASSERT(CurrentThreadCanAccessRuntime(cx->runtime()));
|
|
if (interrupt_ || jitStackLimit_ == UINTPTR_MAX) {
|
|
interrupt_ = false;
|
|
interruptRegExpJit_ = false;
|
|
resetJitStackLimit();
|
|
return InvokeInterruptCallback(cx);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
MathCache*
|
|
JSRuntime::createMathCache(JSContext* cx)
|
|
{
|
|
MOZ_ASSERT(!mathCache_);
|
|
MOZ_ASSERT(cx->runtime() == this);
|
|
|
|
MathCache* newMathCache = js_new<MathCache>();
|
|
if (!newMathCache) {
|
|
ReportOutOfMemory(cx);
|
|
return nullptr;
|
|
}
|
|
|
|
mathCache_ = newMathCache;
|
|
return mathCache_;
|
|
}
|
|
|
|
bool
|
|
JSRuntime::setDefaultLocale(const char* locale)
|
|
{
|
|
if (!locale)
|
|
return false;
|
|
resetDefaultLocale();
|
|
defaultLocale = JS_strdup(this, locale);
|
|
return defaultLocale != nullptr;
|
|
}
|
|
|
|
void
|
|
JSRuntime::resetDefaultLocale()
|
|
{
|
|
js_free(defaultLocale);
|
|
defaultLocale = nullptr;
|
|
}
|
|
|
|
const char*
|
|
JSRuntime::getDefaultLocale()
|
|
{
|
|
if (defaultLocale)
|
|
return defaultLocale;
|
|
|
|
char* locale;
|
|
char* lang;
|
|
char* p;
|
|
#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 = const_cast<char*>("und");
|
|
lang = JS_strdup(this, locale);
|
|
if (!lang)
|
|
return nullptr;
|
|
if ((p = strchr(lang, '.')))
|
|
*p = '\0';
|
|
while ((p = strchr(lang, '_')))
|
|
*p = '-';
|
|
|
|
defaultLocale = lang;
|
|
return defaultLocale;
|
|
}
|
|
|
|
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(this);
|
|
|
|
activityCallback(activityCallbackArg, active);
|
|
}
|
|
|
|
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->isGCScheduled() || 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(JSRuntime* rt)
|
|
{
|
|
return rt->ownerThread_ == PR_GetCurrentThread();
|
|
}
|
|
|
|
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
|
|
|
|
void
|
|
JSRuntime::assertCanLock(RuntimeLock which)
|
|
{
|
|
// In the switch below, each case falls through to the one below it. None
|
|
// of the runtime locks are reentrant, and when multiple locks are acquired
|
|
// it must be done in the order below.
|
|
switch (which) {
|
|
case ExclusiveAccessLock:
|
|
MOZ_ASSERT(exclusiveAccessOwner != PR_GetCurrentThread());
|
|
case HelperThreadStateLock:
|
|
MOZ_ASSERT(!HelperThreadState().isLocked());
|
|
case GCLock:
|
|
gc.assertCanLock();
|
|
break;
|
|
default:
|
|
MOZ_CRASH();
|
|
}
|
|
}
|
|
|
|
void
|
|
js::AssertCurrentThreadCanLock(RuntimeLock which)
|
|
{
|
|
PerThreadData* pt = TlsPerThreadData.get();
|
|
if (pt && pt->runtime_)
|
|
pt->runtime_->assertCanLock(which);
|
|
}
|
|
|
|
#endif // DEBUG
|
|
|
|
JS_FRIEND_API(void)
|
|
JS::UpdateJSRuntimeProfilerSampleBufferGen(JSRuntime* runtime, uint32_t generation,
|
|
uint32_t lapCount)
|
|
{
|
|
runtime->setProfilerSampleBufferGen(generation);
|
|
runtime->updateProfilerSampleBufferLapCount(lapCount);
|
|
}
|
|
|
|
JS_FRIEND_API(bool)
|
|
JS::IsProfilingEnabledForRuntime(JSRuntime* runtime)
|
|
{
|
|
MOZ_ASSERT(runtime);
|
|
return runtime->spsProfiler.enabled();
|
|
}
|