https://github.com/mozilla/gecko-dev
Tip revision: 753bbe0a23f344e74f501c9d88f7f54710c0600f authored by ffxbld on 24 June 2015, 22:28:51 UTC
Added FIREFOX_39_0_RELEASE FIREFOX_39_0_BUILD4 tag(s) for changeset ab10262d2aed. DONTBUILD CLOSED TREE a=release
Added FIREFOX_39_0_RELEASE FIREFOX_39_0_BUILD4 tag(s) for changeset ab10262d2aed. DONTBUILD CLOSED TREE a=release
Tip revision: 753bbe0
jscompartment.cpp
/* -*- 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 "jscompartmentinlines.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/MemoryReporting.h"
#include "jscntxt.h"
#include "jsfriendapi.h"
#include "jsgc.h"
#include "jsiter.h"
#include "jswatchpoint.h"
#include "jswrapper.h"
#include "gc/Marking.h"
#include "jit/JitCompartment.h"
#include "js/Proxy.h"
#include "js/RootingAPI.h"
#include "proxy/DeadObjectProxy.h"
#include "vm/Debugger.h"
#include "vm/StopIterationObject.h"
#include "vm/WrapperObject.h"
#include "jsatominlines.h"
#include "jsfuninlines.h"
#include "jsgcinlines.h"
#include "jsobjinlines.h"
using namespace js;
using namespace js::gc;
using namespace js::jit;
using mozilla::DebugOnly;
using mozilla::PodArrayZero;
JSCompartment::JSCompartment(Zone* zone, const JS::CompartmentOptions& options = JS::CompartmentOptions())
: options_(options),
zone_(zone),
runtime_(zone->runtimeFromMainThread()),
principals(nullptr),
isSystem(false),
isSelfHosting(false),
marked(true),
warnedAboutNoSuchMethod(false),
warnedAboutFlagsArgument(false),
addonId(options.addonIdOrNull()),
#ifdef DEBUG
firedOnNewGlobalObject(false),
#endif
global_(nullptr),
enterCompartmentDepth(0),
totalTime(0),
data(nullptr),
objectMetadataCallback(nullptr),
lastAnimationTime(0),
regExps(runtime_),
globalWriteBarriered(false),
neuteredTypedObjects(0),
propertyTree(thisForCtor()),
selfHostingScriptSource(nullptr),
objectMetadataTable(nullptr),
lazyArrayBuffers(nullptr),
gcIncomingGrayPointers(nullptr),
gcWeakMapList(nullptr),
gcPreserveJitCode(options.preserveJitCode()),
debugModeBits(0),
rngState(0),
watchpointMap(nullptr),
scriptCountsMap(nullptr),
debugScriptMap(nullptr),
debugScopes(nullptr),
enumerators(nullptr),
compartmentStats(nullptr),
scheduledForDestruction(false),
maybeAlive(true),
jitCompartment_(nullptr)
{
PodArrayZero(sawDeprecatedLanguageExtension);
runtime_->numCompartments++;
MOZ_ASSERT_IF(options.mergeable(), options.invisibleToDebugger());
}
JSCompartment::~JSCompartment()
{
reportTelemetry();
js_delete(jitCompartment_);
js_delete(watchpointMap);
js_delete(scriptCountsMap);
js_delete(debugScriptMap);
js_delete(debugScopes);
js_delete(objectMetadataTable);
js_delete(lazyArrayBuffers);
js_free(enumerators);
runtime_->numCompartments--;
}
bool
JSCompartment::init(JSContext* cx)
{
/*
* As a hack, we clear our timezone cache every time we create a new
* compartment. This ensures that the cache is always relatively fresh, but
* shouldn't interfere with benchmarks which create tons of date objects
* (unless they also create tons of iframes, which seems unlikely).
*/
if (cx)
cx->runtime()->dateTimeInfo.updateTimeZoneAdjustment();
if (!crossCompartmentWrappers.init(0))
return false;
if (!regExps.init(cx))
return false;
enumerators = NativeIterator::allocateSentinel(cx);
if (!enumerators)
return false;
if (!savedStacks_.init())
return false;
return true;
}
jit::JitRuntime*
JSRuntime::createJitRuntime(JSContext* cx)
{
// The shared stubs are created in the atoms compartment, which may be
// accessed by other threads with an exclusive context.
AutoLockForExclusiveAccess atomsLock(cx);
MOZ_ASSERT(!jitRuntime_);
jit::JitRuntime* jrt = cx->new_<jit::JitRuntime>();
if (!jrt)
return nullptr;
// Protect jitRuntime_ from being observed (by InterruptRunningJitCode)
// while it is being initialized. Unfortunately, initialization depends on
// jitRuntime_ being non-null, so we can't just wait to assign jitRuntime_.
JitRuntime::AutoMutateBackedges amb(jrt);
jitRuntime_ = jrt;
if (!jitRuntime_->initialize(cx)) {
ReportOutOfMemory(cx);
js_delete(jitRuntime_);
jitRuntime_ = nullptr;
JSCompartment* comp = cx->runtime()->atomsCompartment();
if (comp->jitCompartment_) {
js_delete(comp->jitCompartment_);
comp->jitCompartment_ = nullptr;
}
return nullptr;
}
return jitRuntime_;
}
bool
JSCompartment::ensureJitCompartmentExists(JSContext* cx)
{
using namespace js::jit;
if (jitCompartment_)
return true;
if (!zone()->getJitZone(cx))
return false;
/* Set the compartment early, so linking works. */
jitCompartment_ = cx->new_<JitCompartment>();
if (!jitCompartment_)
return false;
if (!jitCompartment_->initialize(cx)) {
js_delete(jitCompartment_);
jitCompartment_ = nullptr;
return false;
}
return true;
}
/*
* This class is used to add a post barrier on the crossCompartmentWrappers map,
* as the key is calculated based on objects which may be moved by generational
* GC.
*/
class WrapperMapRef : public BufferableRef
{
WrapperMap* map;
CrossCompartmentKey key;
public:
WrapperMapRef(WrapperMap* map, const CrossCompartmentKey& key)
: map(map), key(key) {}
void mark(JSTracer* trc) {
CrossCompartmentKey prior = key;
if (key.debugger)
Mark(trc, &key.debugger, "CCW debugger");
if (key.kind == CrossCompartmentKey::ObjectWrapper ||
key.kind == CrossCompartmentKey::DebuggerObject ||
key.kind == CrossCompartmentKey::DebuggerEnvironment ||
key.kind == CrossCompartmentKey::DebuggerSource)
{
MOZ_ASSERT(IsInsideNursery(key.wrapped) ||
key.wrapped->asTenured().getTraceKind() == JSTRACE_OBJECT);
Mark(trc, reinterpret_cast<JSObject**>(&key.wrapped), "CCW wrapped object");
}
if (key.debugger == prior.debugger && key.wrapped == prior.wrapped)
return;
/* Look for the original entry, which might have been removed. */
WrapperMap::Ptr p = map->lookup(prior);
if (!p)
return;
/* Rekey the entry. */
map->rekeyAs(prior, key, key);
}
};
#ifdef JSGC_HASH_TABLE_CHECKS
void
JSCompartment::checkWrapperMapAfterMovingGC()
{
/*
* Assert that the postbarriers have worked and that nothing is left in
* wrapperMap that points into the nursery, and that the hash table entries
* are discoverable.
*/
for (WrapperMap::Enum e(crossCompartmentWrappers); !e.empty(); e.popFront()) {
CrossCompartmentKey key = e.front().key();
CheckGCThingAfterMovingGC(key.debugger);
CheckGCThingAfterMovingGC(key.wrapped);
CheckGCThingAfterMovingGC(static_cast<Cell*>(e.front().value().get().toGCThing()));
WrapperMap::Ptr ptr = crossCompartmentWrappers.lookup(key);
MOZ_ASSERT(ptr.found() && &*ptr == &e.front());
}
}
#endif
bool
JSCompartment::putWrapper(JSContext* cx, const CrossCompartmentKey& wrapped, const js::Value& wrapper)
{
MOZ_ASSERT(wrapped.wrapped);
MOZ_ASSERT_IF(wrapped.kind == CrossCompartmentKey::StringWrapper, wrapper.isString());
MOZ_ASSERT_IF(wrapped.kind != CrossCompartmentKey::StringWrapper, wrapper.isObject());
bool success = crossCompartmentWrappers.put(wrapped, ReadBarriered<Value>(wrapper));
/* There's no point allocating wrappers in the nursery since we will tenure them anyway. */
MOZ_ASSERT(!IsInsideNursery(static_cast<gc::Cell*>(wrapper.toGCThing())));
if (success && (IsInsideNursery(wrapped.wrapped) || IsInsideNursery(wrapped.debugger))) {
WrapperMapRef ref(&crossCompartmentWrappers, wrapped);
cx->runtime()->gc.storeBuffer.putGeneric(ref);
}
return success;
}
static JSString*
CopyStringPure(JSContext* cx, JSString* str)
{
/*
* Directly allocate the copy in the destination compartment, rather than
* first flattening it (and possibly allocating in source compartment),
* because we don't know whether the flattening will pay off later.
*/
size_t len = str->length();
JSString* copy;
if (str->isLinear()) {
/* Only use AutoStableStringChars if the NoGC allocation fails. */
if (str->hasLatin1Chars()) {
JS::AutoCheckCannotGC nogc;
copy = NewStringCopyN<NoGC>(cx, str->asLinear().latin1Chars(nogc), len);
} else {
JS::AutoCheckCannotGC nogc;
copy = NewStringCopyNDontDeflate<NoGC>(cx, str->asLinear().twoByteChars(nogc), len);
}
if (copy)
return copy;
AutoStableStringChars chars(cx);
if (!chars.init(cx, str))
return nullptr;
return chars.isLatin1()
? NewStringCopyN<CanGC>(cx, chars.latin1Range().start().get(), len)
: NewStringCopyNDontDeflate<CanGC>(cx, chars.twoByteRange().start().get(), len);
}
if (str->hasLatin1Chars()) {
ScopedJSFreePtr<Latin1Char> copiedChars;
if (!str->asRope().copyLatin1CharsZ(cx, copiedChars))
return nullptr;
return NewString<CanGC>(cx, copiedChars.forget(), len);
}
ScopedJSFreePtr<char16_t> copiedChars;
if (!str->asRope().copyTwoByteCharsZ(cx, copiedChars))
return nullptr;
return NewStringDontDeflate<CanGC>(cx, copiedChars.forget(), len);
}
bool
JSCompartment::wrap(JSContext* cx, MutableHandleString strp)
{
MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(this));
MOZ_ASSERT(cx->compartment() == this);
/* If the string is already in this compartment, we are done. */
JSString* str = strp;
if (str->zoneFromAnyThread() == zone())
return true;
/* If the string is an atom, we don't have to copy. */
if (str->isAtom()) {
MOZ_ASSERT(str->isPermanentAtom() ||
cx->runtime()->isAtomsZone(str->zone()));
return true;
}
/* Check the cache. */
RootedValue key(cx, StringValue(str));
if (WrapperMap::Ptr p = crossCompartmentWrappers.lookup(CrossCompartmentKey(key))) {
strp.set(p->value().get().toString());
return true;
}
/* No dice. Make a copy, and cache it. */
JSString* copy = CopyStringPure(cx, str);
if (!copy)
return false;
if (!putWrapper(cx, CrossCompartmentKey(key), StringValue(copy)))
return false;
strp.set(copy);
return true;
}
bool
JSCompartment::wrap(JSContext* cx, MutableHandleObject obj, HandleObject existingArg)
{
MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(this));
MOZ_ASSERT(cx->compartment() == this);
MOZ_ASSERT_IF(existingArg, existingArg->compartment() == cx->compartment());
MOZ_ASSERT_IF(existingArg, IsDeadProxyObject(existingArg));
if (!obj)
return true;
AutoDisableProxyCheck adpc(cx->runtime());
// Wrappers should really be parented to the wrapped parent of the wrapped
// object, but in that case a wrapped global object would have a nullptr
// parent without being a proper global object (JSCLASS_IS_GLOBAL). Instead,
// we parent all wrappers to the global object in their home compartment.
// This loses us some transparency, and is generally very cheesy.
HandleObject global = cx->global();
RootedObject objGlobal(cx, &obj->global());
MOZ_ASSERT(global);
MOZ_ASSERT(objGlobal);
const JSWrapObjectCallbacks* cb = cx->runtime()->wrapObjectCallbacks;
if (obj->compartment() == this) {
obj.set(GetOuterObject(cx, obj));
return true;
}
// If we have a cross-compartment wrapper, make sure that the cx isn't
// associated with the self-hosting global. We don't want to create
// wrappers for objects in other runtimes, which may be the case for the
// self-hosting global.
MOZ_ASSERT(!cx->runtime()->isSelfHostingGlobal(global) &&
!cx->runtime()->isSelfHostingGlobal(objGlobal));
// Unwrap the object, but don't unwrap outer windows.
RootedObject objectPassedToWrap(cx, obj);
obj.set(UncheckedUnwrap(obj, /* stopAtOuter = */ true));
if (obj->compartment() == this) {
MOZ_ASSERT(obj == GetOuterObject(cx, obj));
return true;
}
// Translate StopIteration singleton.
if (obj->is<StopIterationObject>()) {
// StopIteration isn't a constructor, but it's stored in GlobalObject
// as one, out of laziness. Hence the GetBuiltinConstructor call here.
RootedObject stopIteration(cx);
if (!GetBuiltinConstructor(cx, JSProto_StopIteration, &stopIteration))
return false;
obj.set(stopIteration);
return true;
}
// Invoke the prewrap callback. We're a bit worried about infinite
// recursion here, so we do a check - see bug 809295.
JS_CHECK_SYSTEM_RECURSION(cx, return false);
if (cb->preWrap) {
obj.set(cb->preWrap(cx, global, obj, objectPassedToWrap));
if (!obj)
return false;
}
MOZ_ASSERT(obj == GetOuterObject(cx, obj));
if (obj->compartment() == this)
return true;
// If we already have a wrapper for this value, use it.
RootedValue key(cx, ObjectValue(*obj));
if (WrapperMap::Ptr p = crossCompartmentWrappers.lookup(CrossCompartmentKey(key))) {
obj.set(&p->value().get().toObject());
MOZ_ASSERT(obj->is<CrossCompartmentWrapperObject>());
return true;
}
RootedObject existing(cx, existingArg);
if (existing) {
// Is it possible to reuse |existing|?
if (!existing->getTaggedProto().isLazy() ||
// Note: Class asserted above, so all that's left to check is callability
existing->isCallable() ||
obj->isCallable())
{
existing = nullptr;
}
}
obj.set(cb->wrap(cx, existing, obj));
if (!obj)
return false;
// We maintain the invariant that the key in the cross-compartment wrapper
// map is always directly wrapped by the value.
MOZ_ASSERT(Wrapper::wrappedObject(obj) == &key.get().toObject());
return putWrapper(cx, CrossCompartmentKey(key), ObjectValue(*obj));
}
bool
JSCompartment::wrap(JSContext* cx, MutableHandle<PropertyDescriptor> desc)
{
if (!wrap(cx, desc.object()))
return false;
if (desc.hasGetterObject()) {
if (!wrap(cx, desc.getterObject()))
return false;
}
if (desc.hasSetterObject()) {
if (!wrap(cx, desc.setterObject()))
return false;
}
return wrap(cx, desc.value());
}
/*
* This method marks pointers that cross compartment boundaries. It is called in
* per-zone GCs (since full GCs naturally follow pointers across compartments)
* and when compacting to update cross-compartment pointers.
*/
void
JSCompartment::markCrossCompartmentWrappers(JSTracer* trc)
{
MOZ_ASSERT(!zone()->isCollecting() || trc->runtime()->isHeapCompacting());
for (WrapperMap::Enum e(crossCompartmentWrappers); !e.empty(); e.popFront()) {
Value v = e.front().value();
if (e.front().key().kind == CrossCompartmentKey::ObjectWrapper) {
ProxyObject* wrapper = &v.toObject().as<ProxyObject>();
/*
* We have a cross-compartment wrapper. Its private pointer may
* point into the compartment being collected, so we should mark it.
*/
MarkValue(trc, wrapper->slotOfPrivate(), "cross-compartment wrapper");
}
}
}
void
JSCompartment::trace(JSTracer* trc)
{
savedStacks_.trace(trc);
}
void
JSCompartment::markRoots(JSTracer* trc)
{
MOZ_ASSERT(!trc->runtime()->isHeapMinorCollecting());
if (jitCompartment_)
jitCompartment_->mark(trc, this);
/*
* If a compartment is on-stack, we mark its global so that
* JSContext::global() remains valid.
*/
if (enterCompartmentDepth && global_.unbarrieredGet())
MarkObjectRoot(trc, global_.unsafeGet(), "on-stack compartment global");
}
void
JSCompartment::sweepInnerViews()
{
innerViews.sweep(runtimeFromAnyThread());
}
void
JSCompartment::sweepSavedStacks()
{
savedStacks_.sweep(runtimeFromAnyThread());
}
void
JSCompartment::sweepGlobalObject(FreeOp* fop)
{
if (global_.unbarrieredGet() && IsObjectAboutToBeFinalizedFromAnyThread(global_.unsafeGet())) {
if (isDebuggee())
Debugger::detachAllDebuggersFromGlobal(fop, global_);
global_.set(nullptr);
}
}
void
JSCompartment::sweepSelfHostingScriptSource()
{
if (selfHostingScriptSource.unbarrieredGet() &&
IsObjectAboutToBeFinalizedFromAnyThread((JSObject**) selfHostingScriptSource.unsafeGet()))
{
selfHostingScriptSource.set(nullptr);
}
}
void
JSCompartment::sweepJitCompartment(FreeOp* fop)
{
if (jitCompartment_)
jitCompartment_->sweep(fop, this);
}
void
JSCompartment::sweepRegExps()
{
/*
* JIT code increments activeWarmUpCounter for any RegExpShared used by jit
* code for the lifetime of the JIT script. Thus, we must perform
* sweeping after clearing jit code.
*/
regExps.sweep(runtimeFromAnyThread());
}
void
JSCompartment::sweepDebugScopes()
{
JSRuntime* rt = runtimeFromAnyThread();
if (debugScopes)
debugScopes->sweep(rt);
}
void
JSCompartment::sweepWeakMaps()
{
/* Finalize unreachable (key,value) pairs in all weak maps. */
WeakMapBase::sweepCompartment(this);
}
void
JSCompartment::sweepNativeIterators()
{
/* Sweep list of native iterators. */
NativeIterator* ni = enumerators->next();
while (ni != enumerators) {
JSObject* iterObj = ni->iterObj();
NativeIterator* next = ni->next();
if (gc::IsObjectAboutToBeFinalizedFromAnyThread(&iterObj))
ni->unlink();
ni = next;
}
}
/*
* Remove dead wrappers from the table. We must sweep all compartments, since
* string entries in the crossCompartmentWrappers table are not marked during
* markCrossCompartmentWrappers.
*/
void
JSCompartment::sweepCrossCompartmentWrappers()
{
/* Remove dead wrappers from the table. */
for (WrapperMap::Enum e(crossCompartmentWrappers); !e.empty(); e.popFront()) {
CrossCompartmentKey key = e.front().key();
bool keyDying;
switch (key.kind) {
case CrossCompartmentKey::ObjectWrapper:
case CrossCompartmentKey::DebuggerObject:
case CrossCompartmentKey::DebuggerEnvironment:
case CrossCompartmentKey::DebuggerSource:
MOZ_ASSERT(IsInsideNursery(key.wrapped) ||
key.wrapped->asTenured().getTraceKind() == JSTRACE_OBJECT);
keyDying = IsObjectAboutToBeFinalizedFromAnyThread(
reinterpret_cast<JSObject**>(&key.wrapped));
break;
case CrossCompartmentKey::StringWrapper:
MOZ_ASSERT(key.wrapped->asTenured().getTraceKind() == JSTRACE_STRING);
keyDying = IsStringAboutToBeFinalizedFromAnyThread(
reinterpret_cast<JSString**>(&key.wrapped));
break;
case CrossCompartmentKey::DebuggerScript:
MOZ_ASSERT(key.wrapped->asTenured().getTraceKind() == JSTRACE_SCRIPT);
keyDying = IsScriptAboutToBeFinalizedFromAnyThread(
reinterpret_cast<JSScript**>(&key.wrapped));
break;
default:
MOZ_CRASH("Unknown key kind");
}
bool valDying = IsValueAboutToBeFinalizedFromAnyThread(e.front().value().unsafeGet());
bool dbgDying = key.debugger && IsObjectAboutToBeFinalizedFromAnyThread(&key.debugger);
if (keyDying || valDying || dbgDying) {
MOZ_ASSERT(key.kind != CrossCompartmentKey::StringWrapper);
e.removeFront();
} else if (key.wrapped != e.front().key().wrapped ||
key.debugger != e.front().key().debugger)
{
e.rekeyFront(key);
}
}
}
void JSCompartment::fixupAfterMovingGC()
{
fixupGlobal();
fixupInitialShapeTable();
objectGroups.fixupTablesAfterMovingGC();
}
void
JSCompartment::fixupGlobal()
{
GlobalObject* global = *global_.unsafeGet();
if (global)
global_.set(MaybeForwarded(global));
}
void
JSCompartment::purge()
{
dtoaCache.purge();
}
void
JSCompartment::clearTables()
{
global_.set(nullptr);
// No scripts should have run in this compartment. This is used when
// merging a compartment that has been used off thread into another
// compartment and zone.
MOZ_ASSERT(crossCompartmentWrappers.empty());
MOZ_ASSERT(!jitCompartment_);
MOZ_ASSERT(!debugScopes);
MOZ_ASSERT(!gcWeakMapList);
MOZ_ASSERT(enumerators->next() == enumerators);
MOZ_ASSERT(regExps.empty());
objectGroups.clearTables();
if (baseShapes.initialized())
baseShapes.clear();
if (initialShapes.initialized())
initialShapes.clear();
if (savedStacks_.initialized())
savedStacks_.clear();
}
void
JSCompartment::setObjectMetadataCallback(js::ObjectMetadataCallback callback)
{
// Clear any jitcode in the runtime, which behaves differently depending on
// whether there is a creation callback.
ReleaseAllJITCode(runtime_->defaultFreeOp());
objectMetadataCallback = callback;
}
void
JSCompartment::clearObjectMetadata()
{
js_delete(objectMetadataTable);
objectMetadataTable = nullptr;
}
void
JSCompartment::setNewObjectMetadata(JSContext* cx, JSObject* obj)
{
MOZ_ASSERT(this == cx->compartment());
if (JSObject* metadata = objectMetadataCallback(cx)) {
if (!objectMetadataTable) {
objectMetadataTable = cx->new_<ObjectWeakMap>(cx);
if (!objectMetadataTable)
CrashAtUnhandlableOOM("setObjectMetadata");
}
if (!objectMetadataTable->add(cx, obj, metadata))
CrashAtUnhandlableOOM("setObjectMetadata");
}
}
static bool
AddInnerLazyFunctionsFromScript(JSScript* script, AutoObjectVector& lazyFunctions)
{
if (!script->hasObjects())
return true;
ObjectArray* objects = script->objects();
for (size_t i = script->innerObjectsStart(); i < objects->length; i++) {
JSObject* obj = objects->vector[i];
if (obj->is<JSFunction>() && obj->as<JSFunction>().isInterpretedLazy()) {
if (!lazyFunctions.append(obj))
return false;
}
}
return true;
}
static bool
AddLazyFunctionsForCompartment(JSContext* cx, AutoObjectVector& lazyFunctions, AllocKind kind)
{
// Find all live root lazy functions in the compartment: those which
// have not been compiled, which have a source object, indicating that
// they have a parent, and which do not have an uncompiled enclosing
// script. The last condition is so that we don't compile lazy scripts
// whose enclosing scripts failed to compile, indicating that the lazy
// script did not escape the script.
for (gc::ZoneCellIter i(cx->zone(), kind); !i.done(); i.next()) {
JSObject* obj = i.get<JSObject>();
// Sweeping is incremental; take care to not delazify functions that
// are about to be finalized. GC things referenced by objects that are
// about to be finalized (e.g., in slots) may already be freed.
if (gc::IsObjectAboutToBeFinalized(&obj) ||
obj->compartment() != cx->compartment() ||
!obj->is<JSFunction>())
{
continue;
}
JSFunction* fun = &obj->as<JSFunction>();
if (fun->isInterpretedLazy()) {
LazyScript* lazy = fun->lazyScriptOrNull();
if (lazy && lazy->sourceObject() && !lazy->maybeScript() &&
!lazy->hasUncompiledEnclosingScript())
{
if (!lazyFunctions.append(fun))
return false;
}
}
}
return true;
}
static bool
CreateLazyScriptsForCompartment(JSContext* cx)
{
AutoObjectVector lazyFunctions(cx);
if (!AddLazyFunctionsForCompartment(cx, lazyFunctions, JSFunction::FinalizeKind))
return false;
// Methods, for instance {get method() {}}, are extended functions that can
// be relazified, so we need to handle those as well.
if (!AddLazyFunctionsForCompartment(cx, lazyFunctions, JSFunction::ExtendedFinalizeKind))
return false;
// Create scripts for each lazy function, updating the list of functions to
// process with any newly exposed inner functions in created scripts.
// A function cannot be delazified until its outer script exists.
for (size_t i = 0; i < lazyFunctions.length(); i++) {
JSFunction* fun = &lazyFunctions[i]->as<JSFunction>();
// lazyFunctions may have been populated with multiple functions for
// a lazy script.
if (!fun->isInterpretedLazy())
continue;
LazyScript* lazy = fun->lazyScript();
bool lazyScriptHadNoScript = !lazy->maybeScript();
JSScript* script = fun->getOrCreateScript(cx);
if (!script)
return false;
if (lazyScriptHadNoScript && !AddInnerLazyFunctionsFromScript(script, lazyFunctions))
return false;
}
return true;
}
bool
JSCompartment::ensureDelazifyScriptsForDebugger(JSContext* cx)
{
MOZ_ASSERT(cx->compartment() == this);
if (needsDelazificationForDebugger() && !CreateLazyScriptsForCompartment(cx))
return false;
debugModeBits &= ~DebuggerNeedsDelazification;
return true;
}
void
JSCompartment::updateDebuggerObservesFlag(unsigned flag)
{
MOZ_ASSERT(isDebuggee());
MOZ_ASSERT(flag == DebuggerObservesAllExecution ||
flag == DebuggerObservesAsmJS);
const GlobalObject::DebuggerVector* v = maybeGlobal()->getDebuggers();
for (Debugger * const* p = v->begin(); p != v->end(); p++) {
Debugger* dbg = *p;
if (flag == DebuggerObservesAllExecution
? dbg->observesAllExecution()
: dbg->observesAsmJS())
{
debugModeBits |= flag;
return;
}
}
debugModeBits &= ~flag;
}
void
JSCompartment::unsetIsDebuggee()
{
if (isDebuggee()) {
debugModeBits &= ~DebuggerObservesMask;
DebugScopes::onCompartmentUnsetIsDebuggee(this);
}
}
void
JSCompartment::clearBreakpointsIn(FreeOp* fop, js::Debugger* dbg, HandleObject handler)
{
for (gc::ZoneCellIter i(zone(), gc::AllocKind::SCRIPT); !i.done(); i.next()) {
JSScript* script = i.get<JSScript>();
if (script->compartment() == this && script->hasAnyBreakpointsOrStepMode())
script->clearBreakpointsIn(fop, dbg, handler);
}
}
void
JSCompartment::addSizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf,
size_t* tiAllocationSiteTables,
size_t* tiArrayTypeTables,
size_t* tiObjectTypeTables,
size_t* compartmentObject,
size_t* compartmentTables,
size_t* innerViewsArg,
size_t* lazyArrayBuffersArg,
size_t* objectMetadataTablesArg,
size_t* crossCompartmentWrappersArg,
size_t* regexpCompartment,
size_t* savedStacksSet)
{
*compartmentObject += mallocSizeOf(this);
objectGroups.addSizeOfExcludingThis(mallocSizeOf, tiAllocationSiteTables,
tiArrayTypeTables, tiObjectTypeTables,
compartmentTables);
*compartmentTables += baseShapes.sizeOfExcludingThis(mallocSizeOf)
+ initialShapes.sizeOfExcludingThis(mallocSizeOf);
*innerViewsArg += innerViews.sizeOfExcludingThis(mallocSizeOf);
if (lazyArrayBuffers)
*lazyArrayBuffersArg += lazyArrayBuffers->sizeOfIncludingThis(mallocSizeOf);
if (objectMetadataTable)
*objectMetadataTablesArg += objectMetadataTable->sizeOfIncludingThis(mallocSizeOf);
*crossCompartmentWrappersArg += crossCompartmentWrappers.sizeOfExcludingThis(mallocSizeOf);
*regexpCompartment += regExps.sizeOfExcludingThis(mallocSizeOf);
*savedStacksSet += savedStacks_.sizeOfExcludingThis(mallocSizeOf);
}
void
JSCompartment::reportTelemetry()
{
// Only report telemetry for web content, not add-ons or chrome JS.
if (addonId || isSystem)
return;
// Hazard analysis can't tell that the telemetry callbacks don't GC.
JS::AutoSuppressGCAnalysis nogc;
// Call back into Firefox's Telemetry reporter.
for (size_t i = 0; i < DeprecatedLanguageExtensionCount; i++) {
if (sawDeprecatedLanguageExtension[i])
runtime_->addTelemetry(JS_TELEMETRY_DEPRECATED_LANGUAGE_EXTENSIONS_IN_CONTENT, i);
}
}
void
JSCompartment::addTelemetry(const char* filename, DeprecatedLanguageExtension e)
{
// Only report telemetry for web content, not add-ons or chrome JS.
if (addonId || isSystem || !filename || strncmp(filename, "http", 4) != 0)
return;
sawDeprecatedLanguageExtension[e] = true;
}