1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/vm/Runtime.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,948 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#include "vm/Runtime-inl.h"
1.11 +
1.12 +#include "mozilla/ArrayUtils.h"
1.13 +#include "mozilla/Atomics.h"
1.14 +#include "mozilla/DebugOnly.h"
1.15 +#include "mozilla/MemoryReporting.h"
1.16 +#include "mozilla/ThreadLocal.h"
1.17 +
1.18 +#include <locale.h>
1.19 +#include <string.h>
1.20 +
1.21 +#ifdef JS_CAN_CHECK_THREADSAFE_ACCESSES
1.22 +# include <sys/mman.h>
1.23 +#endif
1.24 +
1.25 +#include "jsatom.h"
1.26 +#include "jsdtoa.h"
1.27 +#include "jsgc.h"
1.28 +#include "jsmath.h"
1.29 +#include "jsnativestack.h"
1.30 +#include "jsobj.h"
1.31 +#include "jsscript.h"
1.32 +#include "jswatchpoint.h"
1.33 +#include "jswrapper.h"
1.34 +
1.35 +#if defined(JS_ION)
1.36 +# include "assembler/assembler/MacroAssembler.h"
1.37 +#endif
1.38 +#include "jit/arm/Simulator-arm.h"
1.39 +#include "jit/AsmJSSignalHandlers.h"
1.40 +#include "jit/JitCompartment.h"
1.41 +#include "jit/PcScriptCache.h"
1.42 +#include "js/MemoryMetrics.h"
1.43 +#include "js/SliceBudget.h"
1.44 +#include "yarr/BumpPointerAllocator.h"
1.45 +
1.46 +#include "jscntxtinlines.h"
1.47 +#include "jsgcinlines.h"
1.48 +
1.49 +using namespace js;
1.50 +using namespace js::gc;
1.51 +
1.52 +using mozilla::Atomic;
1.53 +using mozilla::DebugOnly;
1.54 +using mozilla::NegativeInfinity;
1.55 +using mozilla::PodZero;
1.56 +using mozilla::PodArrayZero;
1.57 +using mozilla::PositiveInfinity;
1.58 +using mozilla::ThreadLocal;
1.59 +using JS::GenericNaN;
1.60 +using JS::DoubleNaNValue;
1.61 +
1.62 +/* static */ ThreadLocal<PerThreadData*> js::TlsPerThreadData;
1.63 +
1.64 +#ifdef JS_THREADSAFE
1.65 +/* static */ Atomic<size_t> JSRuntime::liveRuntimesCount;
1.66 +#else
1.67 +/* static */ size_t JSRuntime::liveRuntimesCount;
1.68 +#endif
1.69 +
1.70 +const JSSecurityCallbacks js::NullSecurityCallbacks = { };
1.71 +
1.72 +PerThreadData::PerThreadData(JSRuntime *runtime)
1.73 + : PerThreadDataFriendFields(),
1.74 + runtime_(runtime),
1.75 + ionTop(nullptr),
1.76 + jitJSContext(nullptr),
1.77 + jitStackLimit(0),
1.78 +#ifdef JS_TRACE_LOGGING
1.79 + traceLogger(nullptr),
1.80 +#endif
1.81 + activation_(nullptr),
1.82 + asmJSActivationStack_(nullptr),
1.83 + autoFlushICache_(nullptr),
1.84 +#ifdef JS_ARM_SIMULATOR
1.85 + simulator_(nullptr),
1.86 + simulatorStackLimit_(0),
1.87 +#endif
1.88 + dtoaState(nullptr),
1.89 + suppressGC(0),
1.90 + activeCompilations(0)
1.91 +{}
1.92 +
1.93 +PerThreadData::~PerThreadData()
1.94 +{
1.95 + if (dtoaState)
1.96 + js_DestroyDtoaState(dtoaState);
1.97 +
1.98 +#ifdef JS_ARM_SIMULATOR
1.99 + js_delete(simulator_);
1.100 +#endif
1.101 +}
1.102 +
1.103 +bool
1.104 +PerThreadData::init()
1.105 +{
1.106 + dtoaState = js_NewDtoaState();
1.107 + if (!dtoaState)
1.108 + return false;
1.109 +
1.110 + return true;
1.111 +}
1.112 +
1.113 +static const JSWrapObjectCallbacks DefaultWrapObjectCallbacks = {
1.114 + TransparentObjectWrapper,
1.115 + nullptr
1.116 +};
1.117 +
1.118 +JSRuntime::JSRuntime(JSRuntime *parentRuntime, JSUseHelperThreads useHelperThreads)
1.119 + : JS::shadow::Runtime(
1.120 +#ifdef JSGC_GENERATIONAL
1.121 + &gcStoreBuffer
1.122 +#endif
1.123 + ),
1.124 + mainThread(this),
1.125 + parentRuntime(parentRuntime),
1.126 + interrupt(false),
1.127 +#if defined(JS_THREADSAFE) && defined(JS_ION)
1.128 + interruptPar(false),
1.129 +#endif
1.130 + handlingSignal(false),
1.131 + interruptCallback(nullptr),
1.132 +#ifdef JS_THREADSAFE
1.133 + interruptLock(nullptr),
1.134 + interruptLockOwner(nullptr),
1.135 + exclusiveAccessLock(nullptr),
1.136 + exclusiveAccessOwner(nullptr),
1.137 + mainThreadHasExclusiveAccess(false),
1.138 + numExclusiveThreads(0),
1.139 +#else
1.140 + interruptLockTaken(false),
1.141 +#endif
1.142 + systemZone(nullptr),
1.143 + numCompartments(0),
1.144 + localeCallbacks(nullptr),
1.145 + defaultLocale(nullptr),
1.146 + defaultVersion_(JSVERSION_DEFAULT),
1.147 +#ifdef JS_THREADSAFE
1.148 + ownerThread_(nullptr),
1.149 +#endif
1.150 + tempLifoAlloc(TEMP_LIFO_ALLOC_PRIMARY_CHUNK_SIZE),
1.151 + freeLifoAlloc(TEMP_LIFO_ALLOC_PRIMARY_CHUNK_SIZE),
1.152 + execAlloc_(nullptr),
1.153 + bumpAlloc_(nullptr),
1.154 + jitRuntime_(nullptr),
1.155 + selfHostingGlobal_(nullptr),
1.156 + nativeStackBase(0),
1.157 + cxCallback(nullptr),
1.158 + destroyCompartmentCallback(nullptr),
1.159 + destroyZoneCallback(nullptr),
1.160 + sweepZoneCallback(nullptr),
1.161 + compartmentNameCallback(nullptr),
1.162 + activityCallback(nullptr),
1.163 + activityCallbackArg(nullptr),
1.164 +#ifdef JS_THREADSAFE
1.165 + requestDepth(0),
1.166 +# ifdef DEBUG
1.167 + checkRequestDepth(0),
1.168 +# endif
1.169 +#endif
1.170 +#ifdef DEBUG
1.171 + activeContext(nullptr),
1.172 +#endif
1.173 + gcInitialized(false),
1.174 + gcSystemAvailableChunkListHead(nullptr),
1.175 + gcUserAvailableChunkListHead(nullptr),
1.176 + gcBytes(0),
1.177 + gcMaxBytes(0),
1.178 + gcMaxMallocBytes(0),
1.179 + gcNumArenasFreeCommitted(0),
1.180 + gcMarker(this),
1.181 + gcVerifyPreData(nullptr),
1.182 + gcVerifyPostData(nullptr),
1.183 + gcChunkAllocationSinceLastGC(false),
1.184 + gcNextFullGCTime(0),
1.185 + gcLastGCTime(0),
1.186 + gcJitReleaseTime(0),
1.187 + gcAllocationThreshold(30 * 1024 * 1024),
1.188 + gcHighFrequencyGC(false),
1.189 + gcHighFrequencyTimeThreshold(1000),
1.190 + gcHighFrequencyLowLimitBytes(100 * 1024 * 1024),
1.191 + gcHighFrequencyHighLimitBytes(500 * 1024 * 1024),
1.192 + gcHighFrequencyHeapGrowthMax(3.0),
1.193 + gcHighFrequencyHeapGrowthMin(1.5),
1.194 + gcLowFrequencyHeapGrowth(1.5),
1.195 + gcDynamicHeapGrowth(false),
1.196 + gcDynamicMarkSlice(false),
1.197 + gcDecommitThreshold(32 * 1024 * 1024),
1.198 + gcShouldCleanUpEverything(false),
1.199 + gcGrayBitsValid(false),
1.200 + gcIsNeeded(0),
1.201 + gcStats(thisFromCtor()),
1.202 + gcNumber(0),
1.203 + gcStartNumber(0),
1.204 + gcIsFull(false),
1.205 + gcTriggerReason(JS::gcreason::NO_REASON),
1.206 + gcStrictCompartmentChecking(false),
1.207 +#ifdef DEBUG
1.208 + gcDisableStrictProxyCheckingCount(0),
1.209 +#endif
1.210 + gcIncrementalState(gc::NO_INCREMENTAL),
1.211 + gcLastMarkSlice(false),
1.212 + gcSweepOnBackgroundThread(false),
1.213 + gcFoundBlackGrayEdges(false),
1.214 + gcSweepingZones(nullptr),
1.215 + gcZoneGroupIndex(0),
1.216 + gcZoneGroups(nullptr),
1.217 + gcCurrentZoneGroup(nullptr),
1.218 + gcSweepPhase(0),
1.219 + gcSweepZone(nullptr),
1.220 + gcSweepKindIndex(0),
1.221 + gcAbortSweepAfterCurrentGroup(false),
1.222 + gcArenasAllocatedDuringSweep(nullptr),
1.223 +#ifdef DEBUG
1.224 + gcMarkingValidator(nullptr),
1.225 +#endif
1.226 + gcInterFrameGC(0),
1.227 + gcSliceBudget(SliceBudget::Unlimited),
1.228 + gcIncrementalEnabled(true),
1.229 + gcGenerationalDisabled(0),
1.230 + gcManipulatingDeadZones(false),
1.231 + gcObjectsMarkedInDeadZones(0),
1.232 + gcPoke(false),
1.233 + heapState(Idle),
1.234 +#ifdef JSGC_GENERATIONAL
1.235 + gcNursery(thisFromCtor()),
1.236 + gcStoreBuffer(thisFromCtor(), gcNursery),
1.237 +#endif
1.238 +#ifdef JS_GC_ZEAL
1.239 + gcZeal_(0),
1.240 + gcZealFrequency(0),
1.241 + gcNextScheduled(0),
1.242 + gcDeterministicOnly(false),
1.243 + gcIncrementalLimit(0),
1.244 +#endif
1.245 + gcValidate(true),
1.246 + gcFullCompartmentChecks(false),
1.247 + gcCallback(nullptr),
1.248 + gcSliceCallback(nullptr),
1.249 + gcFinalizeCallback(nullptr),
1.250 + gcMallocBytes(0),
1.251 + gcMallocGCTriggered(false),
1.252 +#ifdef JS_ARM_SIMULATOR
1.253 + simulatorRuntime_(nullptr),
1.254 +#endif
1.255 + scriptAndCountsVector(nullptr),
1.256 + NaNValue(DoubleNaNValue()),
1.257 + negativeInfinityValue(DoubleValue(NegativeInfinity<double>())),
1.258 + positiveInfinityValue(DoubleValue(PositiveInfinity<double>())),
1.259 + emptyString(nullptr),
1.260 + debugMode(false),
1.261 + spsProfiler(thisFromCtor()),
1.262 + profilingScripts(false),
1.263 + alwaysPreserveCode(false),
1.264 + hadOutOfMemory(false),
1.265 + haveCreatedContext(false),
1.266 + data(nullptr),
1.267 + gcLock(nullptr),
1.268 + gcLockOwner(nullptr),
1.269 + gcHelperThread(thisFromCtor()),
1.270 + signalHandlersInstalled_(false),
1.271 + defaultFreeOp_(thisFromCtor(), false),
1.272 + debuggerMutations(0),
1.273 + securityCallbacks(const_cast<JSSecurityCallbacks *>(&NullSecurityCallbacks)),
1.274 + DOMcallbacks(nullptr),
1.275 + destroyPrincipals(nullptr),
1.276 + structuredCloneCallbacks(nullptr),
1.277 + telemetryCallback(nullptr),
1.278 + propertyRemovals(0),
1.279 +#if !EXPOSE_INTL_API
1.280 + thousandsSeparator(0),
1.281 + decimalSeparator(0),
1.282 + numGrouping(0),
1.283 +#endif
1.284 + mathCache_(nullptr),
1.285 + activeCompilations_(0),
1.286 + keepAtoms_(0),
1.287 + trustedPrincipals_(nullptr),
1.288 + beingDestroyed_(false),
1.289 + atoms_(nullptr),
1.290 + atomsCompartment_(nullptr),
1.291 + staticStrings(nullptr),
1.292 + commonNames(nullptr),
1.293 + permanentAtoms(nullptr),
1.294 + wrapObjectCallbacks(&DefaultWrapObjectCallbacks),
1.295 + preserveWrapperCallback(nullptr),
1.296 +#ifdef DEBUG
1.297 + noGCOrAllocationCheck(0),
1.298 +#endif
1.299 + jitSupportsFloatingPoint(false),
1.300 + ionPcScriptCache(nullptr),
1.301 + threadPool(this),
1.302 + defaultJSContextCallback(nullptr),
1.303 + ctypesActivityCallback(nullptr),
1.304 + forkJoinWarmup(0),
1.305 + ionReturnOverride_(MagicValue(JS_ARG_POISON)),
1.306 + useHelperThreads_(useHelperThreads),
1.307 + parallelIonCompilationEnabled_(true),
1.308 + parallelParsingEnabled_(true),
1.309 + isWorkerRuntime_(false),
1.310 +#ifdef DEBUG
1.311 + enteredPolicy(nullptr),
1.312 +#endif
1.313 + largeAllocationFailureCallback(nullptr),
1.314 + oomCallback(nullptr)
1.315 +{
1.316 + liveRuntimesCount++;
1.317 +
1.318 + setGCMode(JSGC_MODE_GLOBAL);
1.319 +
1.320 + /* Initialize infallibly first, so we can goto bad and JS_DestroyRuntime. */
1.321 + JS_INIT_CLIST(&onNewGlobalObjectWatchers);
1.322 +
1.323 + PodZero(&debugHooks);
1.324 + PodArrayZero(nativeStackQuota);
1.325 + PodZero(&asmJSCacheOps);
1.326 +}
1.327 +
1.328 +static bool
1.329 +JitSupportsFloatingPoint()
1.330 +{
1.331 +#if defined(JS_ION)
1.332 + if (!JSC::MacroAssembler::supportsFloatingPoint())
1.333 + return false;
1.334 +
1.335 +#if defined(JS_ION) && WTF_ARM_ARCH_VERSION == 6
1.336 + if (!js::jit::hasVFP())
1.337 + return false;
1.338 +#endif
1.339 +
1.340 + return true;
1.341 +#else
1.342 + return false;
1.343 +#endif
1.344 +}
1.345 +
1.346 +bool
1.347 +JSRuntime::init(uint32_t maxbytes)
1.348 +{
1.349 +#ifdef JS_THREADSAFE
1.350 + ownerThread_ = PR_GetCurrentThread();
1.351 +
1.352 + interruptLock = PR_NewLock();
1.353 + if (!interruptLock)
1.354 + return false;
1.355 +
1.356 + gcLock = PR_NewLock();
1.357 + if (!gcLock)
1.358 + return false;
1.359 +
1.360 + exclusiveAccessLock = PR_NewLock();
1.361 + if (!exclusiveAccessLock)
1.362 + return false;
1.363 +#endif
1.364 +
1.365 + if (!mainThread.init())
1.366 + return false;
1.367 +
1.368 + js::TlsPerThreadData.set(&mainThread);
1.369 +
1.370 + if (!threadPool.init())
1.371 + return false;
1.372 +
1.373 + if (!js_InitGC(this, maxbytes))
1.374 + return false;
1.375 +
1.376 + if (!gcMarker.init(gcMode()))
1.377 + return false;
1.378 +
1.379 + const char *size = getenv("JSGC_MARK_STACK_LIMIT");
1.380 + if (size)
1.381 + SetMarkStackLimit(this, atoi(size));
1.382 +
1.383 + ScopedJSDeletePtr<Zone> atomsZone(new_<Zone>(this));
1.384 + if (!atomsZone)
1.385 + return false;
1.386 +
1.387 + JS::CompartmentOptions options;
1.388 + ScopedJSDeletePtr<JSCompartment> atomsCompartment(new_<JSCompartment>(atomsZone.get(), options));
1.389 + if (!atomsCompartment || !atomsCompartment->init(nullptr))
1.390 + return false;
1.391 +
1.392 + zones.append(atomsZone.get());
1.393 + atomsZone->compartments.append(atomsCompartment.get());
1.394 +
1.395 + atomsCompartment->isSystem = true;
1.396 + atomsZone->isSystem = true;
1.397 + atomsZone->setGCLastBytes(8192, GC_NORMAL);
1.398 +
1.399 + atomsZone.forget();
1.400 + this->atomsCompartment_ = atomsCompartment.forget();
1.401 +
1.402 + if (!scriptDataTable_.init())
1.403 + return false;
1.404 +
1.405 + if (!evalCache.init())
1.406 + return false;
1.407 +
1.408 + /* The garbage collector depends on everything before this point being initialized. */
1.409 + gcInitialized = true;
1.410 +
1.411 + if (!InitRuntimeNumberState(this))
1.412 + return false;
1.413 +
1.414 + dateTimeInfo.updateTimeZoneAdjustment();
1.415 +
1.416 +#ifdef JS_ARM_SIMULATOR
1.417 + simulatorRuntime_ = js::jit::CreateSimulatorRuntime();
1.418 + if (!simulatorRuntime_)
1.419 + return false;
1.420 +#endif
1.421 +
1.422 + nativeStackBase = GetNativeStackBase();
1.423 +
1.424 + jitSupportsFloatingPoint = JitSupportsFloatingPoint();
1.425 +
1.426 +#ifdef JS_ION
1.427 + signalHandlersInstalled_ = EnsureAsmJSSignalHandlersInstalled(this);
1.428 +#endif
1.429 +
1.430 + if (!spsProfiler.init())
1.431 + return false;
1.432 +
1.433 + return true;
1.434 +}
1.435 +
1.436 +JSRuntime::~JSRuntime()
1.437 +{
1.438 + JS_ASSERT(!isHeapBusy());
1.439 +
1.440 + if (gcInitialized) {
1.441 + /* Free source hook early, as its destructor may want to delete roots. */
1.442 + sourceHook = nullptr;
1.443 +
1.444 + /*
1.445 + * Cancel any pending, in progress or completed Ion compilations and
1.446 + * parse tasks. Waiting for AsmJS and compression tasks is done
1.447 + * synchronously (on the main thread or during parse tasks), so no
1.448 + * explicit canceling is needed for these.
1.449 + */
1.450 + for (CompartmentsIter comp(this, SkipAtoms); !comp.done(); comp.next())
1.451 + CancelOffThreadIonCompile(comp, nullptr);
1.452 + CancelOffThreadParses(this);
1.453 +
1.454 + /* Clear debugging state to remove GC roots. */
1.455 + for (CompartmentsIter comp(this, SkipAtoms); !comp.done(); comp.next()) {
1.456 + comp->clearTraps(defaultFreeOp());
1.457 + if (WatchpointMap *wpmap = comp->watchpointMap)
1.458 + wpmap->clear();
1.459 + }
1.460 +
1.461 + /* Clear atoms to remove GC roots and heap allocations. */
1.462 + finishAtoms();
1.463 +
1.464 + /*
1.465 + * Flag us as being destroyed. This allows the GC to free things like
1.466 + * interned atoms and Ion trampolines.
1.467 + */
1.468 + beingDestroyed_ = true;
1.469 +
1.470 + /* Allow the GC to release scripts that were being profiled. */
1.471 + profilingScripts = false;
1.472 +
1.473 + JS::PrepareForFullGC(this);
1.474 + GC(this, GC_NORMAL, JS::gcreason::DESTROY_RUNTIME);
1.475 + }
1.476 +
1.477 + /*
1.478 + * Clear the self-hosted global and delete self-hosted classes *after*
1.479 + * GC, as finalizers for objects check for clasp->finalize during GC.
1.480 + */
1.481 + finishSelfHosting();
1.482 +
1.483 +#ifdef JS_THREADSAFE
1.484 + JS_ASSERT(!exclusiveAccessOwner);
1.485 + if (exclusiveAccessLock)
1.486 + PR_DestroyLock(exclusiveAccessLock);
1.487 +
1.488 + // Avoid bogus asserts during teardown.
1.489 + JS_ASSERT(!numExclusiveThreads);
1.490 + mainThreadHasExclusiveAccess = true;
1.491 +
1.492 + JS_ASSERT(!interruptLockOwner);
1.493 + if (interruptLock)
1.494 + PR_DestroyLock(interruptLock);
1.495 +#endif
1.496 +
1.497 + /*
1.498 + * Even though all objects in the compartment are dead, we may have keep
1.499 + * some filenames around because of gcKeepAtoms.
1.500 + */
1.501 + FreeScriptData(this);
1.502 +
1.503 +#ifdef DEBUG
1.504 + /* Don't hurt everyone in leaky ol' Mozilla with a fatal JS_ASSERT! */
1.505 + if (hasContexts()) {
1.506 + unsigned cxcount = 0;
1.507 + for (ContextIter acx(this); !acx.done(); acx.next()) {
1.508 + fprintf(stderr,
1.509 +"JS API usage error: found live context at %p\n",
1.510 + (void *) acx.get());
1.511 + cxcount++;
1.512 + }
1.513 + fprintf(stderr,
1.514 +"JS API usage error: %u context%s left in runtime upon JS_DestroyRuntime.\n",
1.515 + cxcount, (cxcount == 1) ? "" : "s");
1.516 + }
1.517 +#endif
1.518 +
1.519 +#if !EXPOSE_INTL_API
1.520 + FinishRuntimeNumberState(this);
1.521 +#endif
1.522 +
1.523 + js_FinishGC(this);
1.524 + atomsCompartment_ = nullptr;
1.525 +
1.526 +#ifdef JS_THREADSAFE
1.527 + if (gcLock)
1.528 + PR_DestroyLock(gcLock);
1.529 +#endif
1.530 +
1.531 + js_free(defaultLocale);
1.532 + js_delete(bumpAlloc_);
1.533 + js_delete(mathCache_);
1.534 +#ifdef JS_ION
1.535 + js_delete(jitRuntime_);
1.536 +#endif
1.537 + js_delete(execAlloc_); /* Delete after jitRuntime_. */
1.538 +
1.539 + js_delete(ionPcScriptCache);
1.540 +
1.541 +#ifdef JSGC_GENERATIONAL
1.542 + gcStoreBuffer.disable();
1.543 + gcNursery.disable();
1.544 +#endif
1.545 +
1.546 +#ifdef JS_ARM_SIMULATOR
1.547 + js::jit::DestroySimulatorRuntime(simulatorRuntime_);
1.548 +#endif
1.549 +
1.550 + DebugOnly<size_t> oldCount = liveRuntimesCount--;
1.551 + JS_ASSERT(oldCount > 0);
1.552 +
1.553 +#ifdef JS_THREADSAFE
1.554 + js::TlsPerThreadData.set(nullptr);
1.555 +#endif
1.556 +}
1.557 +
1.558 +void
1.559 +NewObjectCache::clearNurseryObjects(JSRuntime *rt)
1.560 +{
1.561 + for (unsigned i = 0; i < mozilla::ArrayLength(entries); ++i) {
1.562 + Entry &e = entries[i];
1.563 + JSObject *obj = reinterpret_cast<JSObject *>(&e.templateObject);
1.564 + if (IsInsideNursery(rt, e.key) ||
1.565 + IsInsideNursery(rt, obj->slots) ||
1.566 + IsInsideNursery(rt, obj->elements))
1.567 + {
1.568 + PodZero(&e);
1.569 + }
1.570 + }
1.571 +}
1.572 +
1.573 +void
1.574 +JSRuntime::resetJitStackLimit()
1.575 +{
1.576 + AutoLockForInterrupt lock(this);
1.577 + mainThread.setJitStackLimit(mainThread.nativeStackLimit[js::StackForUntrustedScript]);
1.578 +
1.579 +#ifdef JS_ARM_SIMULATOR
1.580 + mainThread.setJitStackLimit(js::jit::Simulator::StackLimit());
1.581 +#endif
1.582 + }
1.583 +
1.584 +void
1.585 +JSRuntime::addSizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf, JS::RuntimeSizes *rtSizes)
1.586 +{
1.587 + // Several tables in the runtime enumerated below can be used off thread.
1.588 + AutoLockForExclusiveAccess lock(this);
1.589 +
1.590 + rtSizes->object += mallocSizeOf(this);
1.591 +
1.592 + rtSizes->atomsTable += atoms().sizeOfIncludingThis(mallocSizeOf);
1.593 +
1.594 + if (!parentRuntime) {
1.595 + rtSizes->atomsTable += mallocSizeOf(staticStrings);
1.596 + rtSizes->atomsTable += mallocSizeOf(commonNames);
1.597 + rtSizes->atomsTable += permanentAtoms->sizeOfIncludingThis(mallocSizeOf);
1.598 + }
1.599 +
1.600 + for (ContextIter acx(this); !acx.done(); acx.next())
1.601 + rtSizes->contexts += acx->sizeOfIncludingThis(mallocSizeOf);
1.602 +
1.603 + rtSizes->dtoa += mallocSizeOf(mainThread.dtoaState);
1.604 +
1.605 + rtSizes->temporary += tempLifoAlloc.sizeOfExcludingThis(mallocSizeOf);
1.606 +
1.607 + rtSizes->regexpData += bumpAlloc_ ? bumpAlloc_->sizeOfNonHeapData() : 0;
1.608 +
1.609 + rtSizes->interpreterStack += interpreterStack_.sizeOfExcludingThis(mallocSizeOf);
1.610 +
1.611 + rtSizes->mathCache += mathCache_ ? mathCache_->sizeOfIncludingThis(mallocSizeOf) : 0;
1.612 +
1.613 + rtSizes->sourceDataCache += sourceDataCache.sizeOfExcludingThis(mallocSizeOf);
1.614 +
1.615 + rtSizes->scriptData += scriptDataTable().sizeOfExcludingThis(mallocSizeOf);
1.616 + for (ScriptDataTable::Range r = scriptDataTable().all(); !r.empty(); r.popFront())
1.617 + rtSizes->scriptData += mallocSizeOf(r.front());
1.618 +
1.619 + if (execAlloc_)
1.620 + execAlloc_->addSizeOfCode(&rtSizes->code);
1.621 +#ifdef JS_ION
1.622 + {
1.623 + AutoLockForInterrupt lock(this);
1.624 + if (jitRuntime()) {
1.625 + if (JSC::ExecutableAllocator *ionAlloc = jitRuntime()->ionAlloc(this))
1.626 + ionAlloc->addSizeOfCode(&rtSizes->code);
1.627 + }
1.628 + }
1.629 +#endif
1.630 +
1.631 + rtSizes->gc.marker += gcMarker.sizeOfExcludingThis(mallocSizeOf);
1.632 +#ifdef JSGC_GENERATIONAL
1.633 + rtSizes->gc.nurseryCommitted += gcNursery.sizeOfHeapCommitted();
1.634 + rtSizes->gc.nurseryDecommitted += gcNursery.sizeOfHeapDecommitted();
1.635 + rtSizes->gc.nurseryHugeSlots += gcNursery.sizeOfHugeSlots(mallocSizeOf);
1.636 + gcStoreBuffer.addSizeOfExcludingThis(mallocSizeOf, &rtSizes->gc);
1.637 +#endif
1.638 +}
1.639 +
1.640 +static bool
1.641 +SignalBasedTriggersDisabled()
1.642 +{
1.643 + // Don't bother trying to cache the getenv lookup; this should be called
1.644 + // infrequently.
1.645 + return !!getenv("JS_DISABLE_SLOW_SCRIPT_SIGNALS");
1.646 +}
1.647 +
1.648 +void
1.649 +JSRuntime::requestInterrupt(InterruptMode mode)
1.650 +{
1.651 + AutoLockForInterrupt lock(this);
1.652 +
1.653 + /*
1.654 + * Invalidate ionTop to trigger its over-recursion check. Note this must be
1.655 + * set before interrupt, to avoid racing with js::InvokeInterruptCallback,
1.656 + * into a weird state where interrupt is stuck at 0 but jitStackLimit is
1.657 + * MAXADDR.
1.658 + */
1.659 + mainThread.setJitStackLimit(-1);
1.660 +
1.661 + interrupt = true;
1.662 +
1.663 +#ifdef JS_ION
1.664 +#ifdef JS_THREADSAFE
1.665 + RequestInterruptForForkJoin(this, mode);
1.666 +#endif
1.667 +
1.668 + /*
1.669 + * asm.js and, optionally, normal Ion code use memory protection and signal
1.670 + * handlers to halt running code.
1.671 + */
1.672 + if (!SignalBasedTriggersDisabled()) {
1.673 + RequestInterruptForAsmJSCode(this);
1.674 + jit::RequestInterruptForIonCode(this, mode);
1.675 + }
1.676 +#endif
1.677 +}
1.678 +
1.679 +JSC::ExecutableAllocator *
1.680 +JSRuntime::createExecutableAllocator(JSContext *cx)
1.681 +{
1.682 + JS_ASSERT(!execAlloc_);
1.683 + JS_ASSERT(cx->runtime() == this);
1.684 +
1.685 + execAlloc_ = js_new<JSC::ExecutableAllocator>();
1.686 + if (!execAlloc_)
1.687 + js_ReportOutOfMemory(cx);
1.688 + return execAlloc_;
1.689 +}
1.690 +
1.691 +WTF::BumpPointerAllocator *
1.692 +JSRuntime::createBumpPointerAllocator(JSContext *cx)
1.693 +{
1.694 + JS_ASSERT(!bumpAlloc_);
1.695 + JS_ASSERT(cx->runtime() == this);
1.696 +
1.697 + bumpAlloc_ = js_new<WTF::BumpPointerAllocator>();
1.698 + if (!bumpAlloc_)
1.699 + js_ReportOutOfMemory(cx);
1.700 + return bumpAlloc_;
1.701 +}
1.702 +
1.703 +MathCache *
1.704 +JSRuntime::createMathCache(JSContext *cx)
1.705 +{
1.706 + JS_ASSERT(!mathCache_);
1.707 + JS_ASSERT(cx->runtime() == this);
1.708 +
1.709 + MathCache *newMathCache = js_new<MathCache>();
1.710 + if (!newMathCache) {
1.711 + js_ReportOutOfMemory(cx);
1.712 + return nullptr;
1.713 + }
1.714 +
1.715 + mathCache_ = newMathCache;
1.716 + return mathCache_;
1.717 +}
1.718 +
1.719 +bool
1.720 +JSRuntime::setDefaultLocale(const char *locale)
1.721 +{
1.722 + if (!locale)
1.723 + return false;
1.724 + resetDefaultLocale();
1.725 + defaultLocale = JS_strdup(this, locale);
1.726 + return defaultLocale != nullptr;
1.727 +}
1.728 +
1.729 +void
1.730 +JSRuntime::resetDefaultLocale()
1.731 +{
1.732 + js_free(defaultLocale);
1.733 + defaultLocale = nullptr;
1.734 +}
1.735 +
1.736 +const char *
1.737 +JSRuntime::getDefaultLocale()
1.738 +{
1.739 + if (defaultLocale)
1.740 + return defaultLocale;
1.741 +
1.742 + char *locale, *lang, *p;
1.743 +#ifdef HAVE_SETLOCALE
1.744 + locale = setlocale(LC_ALL, nullptr);
1.745 +#else
1.746 + locale = getenv("LANG");
1.747 +#endif
1.748 + // convert to a well-formed BCP 47 language tag
1.749 + if (!locale || !strcmp(locale, "C"))
1.750 + locale = const_cast<char*>("und");
1.751 + lang = JS_strdup(this, locale);
1.752 + if (!lang)
1.753 + return nullptr;
1.754 + if ((p = strchr(lang, '.')))
1.755 + *p = '\0';
1.756 + while ((p = strchr(lang, '_')))
1.757 + *p = '-';
1.758 +
1.759 + defaultLocale = lang;
1.760 + return defaultLocale;
1.761 +}
1.762 +
1.763 +void
1.764 +JSRuntime::triggerActivityCallback(bool active)
1.765 +{
1.766 + if (!activityCallback)
1.767 + return;
1.768 +
1.769 + /*
1.770 + * The activity callback must not trigger a GC: it would create a cirular
1.771 + * dependency between entering a request and Rooted's requirement of being
1.772 + * in a request. In practice this callback already cannot trigger GC. The
1.773 + * suppression serves to inform the exact rooting hazard analysis of this
1.774 + * property and ensures that it remains true in the future.
1.775 + */
1.776 + AutoSuppressGC suppress(this);
1.777 +
1.778 + activityCallback(activityCallbackArg, active);
1.779 +}
1.780 +
1.781 +void
1.782 +JSRuntime::setGCMaxMallocBytes(size_t value)
1.783 +{
1.784 + /*
1.785 + * For compatibility treat any value that exceeds PTRDIFF_T_MAX to
1.786 + * mean that value.
1.787 + */
1.788 + gcMaxMallocBytes = (ptrdiff_t(value) >= 0) ? value : size_t(-1) >> 1;
1.789 + resetGCMallocBytes();
1.790 + for (ZonesIter zone(this, WithAtoms); !zone.done(); zone.next())
1.791 + zone->setGCMaxMallocBytes(value);
1.792 +}
1.793 +
1.794 +void
1.795 +JSRuntime::updateMallocCounter(size_t nbytes)
1.796 +{
1.797 + updateMallocCounter(nullptr, nbytes);
1.798 +}
1.799 +
1.800 +void
1.801 +JSRuntime::updateMallocCounter(JS::Zone *zone, size_t nbytes)
1.802 +{
1.803 + /* We tolerate any thread races when updating gcMallocBytes. */
1.804 + gcMallocBytes -= ptrdiff_t(nbytes);
1.805 + if (MOZ_UNLIKELY(gcMallocBytes <= 0))
1.806 + onTooMuchMalloc();
1.807 + else if (zone)
1.808 + zone->updateMallocCounter(nbytes);
1.809 +}
1.810 +
1.811 +JS_FRIEND_API(void)
1.812 +JSRuntime::onTooMuchMalloc()
1.813 +{
1.814 + if (!CurrentThreadCanAccessRuntime(this))
1.815 + return;
1.816 +
1.817 + if (!gcMallocGCTriggered)
1.818 + gcMallocGCTriggered = TriggerGC(this, JS::gcreason::TOO_MUCH_MALLOC);
1.819 +}
1.820 +
1.821 +JS_FRIEND_API(void *)
1.822 +JSRuntime::onOutOfMemory(void *p, size_t nbytes)
1.823 +{
1.824 + return onOutOfMemory(p, nbytes, nullptr);
1.825 +}
1.826 +
1.827 +JS_FRIEND_API(void *)
1.828 +JSRuntime::onOutOfMemory(void *p, size_t nbytes, JSContext *cx)
1.829 +{
1.830 + if (isHeapBusy())
1.831 + return nullptr;
1.832 +
1.833 + /*
1.834 + * Retry when we are done with the background sweeping and have stopped
1.835 + * all the allocations and released the empty GC chunks.
1.836 + */
1.837 + JS::ShrinkGCBuffers(this);
1.838 + gcHelperThread.waitBackgroundSweepOrAllocEnd();
1.839 + if (!p)
1.840 + p = js_malloc(nbytes);
1.841 + else if (p == reinterpret_cast<void *>(1))
1.842 + p = js_calloc(nbytes);
1.843 + else
1.844 + p = js_realloc(p, nbytes);
1.845 + if (p)
1.846 + return p;
1.847 + if (cx)
1.848 + js_ReportOutOfMemory(cx);
1.849 + return nullptr;
1.850 +}
1.851 +
1.852 +bool
1.853 +JSRuntime::activeGCInAtomsZone()
1.854 +{
1.855 + Zone *zone = atomsCompartment_->zone();
1.856 + return zone->needsBarrier() || zone->isGCScheduled() || zone->wasGCStarted();
1.857 +}
1.858 +
1.859 +#ifdef JS_THREADSAFE
1.860 +
1.861 +void
1.862 +JSRuntime::setUsedByExclusiveThread(Zone *zone)
1.863 +{
1.864 + JS_ASSERT(!zone->usedByExclusiveThread);
1.865 + zone->usedByExclusiveThread = true;
1.866 + numExclusiveThreads++;
1.867 +}
1.868 +
1.869 +void
1.870 +JSRuntime::clearUsedByExclusiveThread(Zone *zone)
1.871 +{
1.872 + JS_ASSERT(zone->usedByExclusiveThread);
1.873 + zone->usedByExclusiveThread = false;
1.874 + numExclusiveThreads--;
1.875 +}
1.876 +
1.877 +bool
1.878 +js::CurrentThreadCanAccessRuntime(JSRuntime *rt)
1.879 +{
1.880 + return rt->ownerThread_ == PR_GetCurrentThread() && !InParallelSection();
1.881 +}
1.882 +
1.883 +bool
1.884 +js::CurrentThreadCanAccessZone(Zone *zone)
1.885 +{
1.886 + if (CurrentThreadCanAccessRuntime(zone->runtime_))
1.887 + return true;
1.888 + if (InParallelSection()) {
1.889 + DebugOnly<PerThreadData *> pt = js::TlsPerThreadData.get();
1.890 + JS_ASSERT(pt && pt->associatedWith(zone->runtime_));
1.891 + return true;
1.892 + }
1.893 +
1.894 + // Only zones in use by an exclusive thread can be used off the main thread
1.895 + // or outside of PJS. We don't keep track of which thread owns such zones
1.896 + // though, so this check is imperfect.
1.897 + return zone->usedByExclusiveThread;
1.898 +}
1.899 +
1.900 +#else // JS_THREADSAFE
1.901 +
1.902 +bool
1.903 +js::CurrentThreadCanAccessRuntime(JSRuntime *rt)
1.904 +{
1.905 + return true;
1.906 +}
1.907 +
1.908 +bool
1.909 +js::CurrentThreadCanAccessZone(Zone *zone)
1.910 +{
1.911 + return true;
1.912 +}
1.913 +
1.914 +#endif // JS_THREADSAFE
1.915 +
1.916 +#ifdef DEBUG
1.917 +
1.918 +void
1.919 +JSRuntime::assertCanLock(RuntimeLock which)
1.920 +{
1.921 +#ifdef JS_THREADSAFE
1.922 + // In the switch below, each case falls through to the one below it. None
1.923 + // of the runtime locks are reentrant, and when multiple locks are acquired
1.924 + // it must be done in the order below.
1.925 + switch (which) {
1.926 + case ExclusiveAccessLock:
1.927 + JS_ASSERT(exclusiveAccessOwner != PR_GetCurrentThread());
1.928 + case WorkerThreadStateLock:
1.929 + JS_ASSERT(!WorkerThreadState().isLocked());
1.930 + case InterruptLock:
1.931 + JS_ASSERT(!currentThreadOwnsInterruptLock());
1.932 + case GCLock:
1.933 + JS_ASSERT(gcLockOwner != PR_GetCurrentThread());
1.934 + break;
1.935 + default:
1.936 + MOZ_CRASH();
1.937 + }
1.938 +#endif // JS_THREADSAFE
1.939 +}
1.940 +
1.941 +void
1.942 +js::AssertCurrentThreadCanLock(RuntimeLock which)
1.943 +{
1.944 +#ifdef JS_THREADSAFE
1.945 + PerThreadData *pt = TlsPerThreadData.get();
1.946 + if (pt && pt->runtime_)
1.947 + pt->runtime_->assertCanLock(which);
1.948 +#endif
1.949 +}
1.950 +
1.951 +#endif // DEBUG
