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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "gc/Barrier.h"
#include "jscompartment.h"
#include "jsobj.h"
#include "builtin/TypedObject.h"
#include "gc/Policy.h"
#include "gc/Zone.h"
#include "js/HashTable.h"
#include "js/Value.h"
#include "vm/EnvironmentObject.h"
#include "vm/SharedArrayObject.h"
#include "vm/Symbol.h"
#include "wasm/WasmJS.h"
namespace js {
bool
RuntimeFromMainThreadIsHeapMajorCollecting(JS::shadow::Zone* shadowZone)
{
return shadowZone->runtimeFromMainThread()->isHeapMajorCollecting();
}
#ifdef DEBUG
bool
IsMarkedBlack(NativeObject* obj)
{
// Note: we assume conservatively that Nursery things will be live.
if (!obj->isTenured())
return true;
gc::TenuredCell& tenured = obj->asTenured();
return (tenured.isMarked(gc::BLACK) && !tenured.isMarked(gc::GRAY)) ||
tenured.arena()->allocatedDuringIncremental;
}
bool
HeapSlot::preconditionForSet(NativeObject* owner, Kind kind, uint32_t slot) const
{
return kind == Slot
? &owner->getSlotRef(slot) == this
: &owner->getDenseElement(slot) == (const Value*)this;
}
bool
HeapSlot::preconditionForWriteBarrierPost(NativeObject* obj, Kind kind, uint32_t slot,
const Value& target) const
{
bool isCorrectSlot = kind == Slot
? obj->getSlotAddressUnchecked(slot)->get() == target
: static_cast<HeapSlot*>(obj->getDenseElements() + slot)->get() == target;
bool isBlackToGray = target.isGCThing() &&
IsMarkedBlack(obj) && JS::GCThingIsMarkedGray(JS::GCCellPtr(target));
return isCorrectSlot && !isBlackToGray;
}
bool
CurrentThreadIsIonCompiling()
{
return TlsPerThreadData.get()->ionCompiling;
}
bool
CurrentThreadIsIonCompilingSafeForMinorGC()
{
return TlsPerThreadData.get()->ionCompilingSafeForMinorGC;
}
bool
CurrentThreadIsGCSweeping()
{
return TlsPerThreadData.get()->gcSweeping;
}
#endif // DEBUG
template <typename S>
template <typename T>
void
ReadBarrierFunctor<S>::operator()(T* t)
{
InternalBarrierMethods<T*>::readBarrier(t);
}
// All GC things may be held in a Value, either publicly or as a private GC
// thing.
#define JS_EXPAND_DEF(name, type, _) \
template void ReadBarrierFunctor<JS::Value>::operator()<type>(type*);
JS_FOR_EACH_TRACEKIND(JS_EXPAND_DEF);
#undef JS_EXPAND_DEF
template <typename S>
template <typename T>
void
PreBarrierFunctor<S>::operator()(T* t)
{
InternalBarrierMethods<T*>::preBarrier(t);
}
// All GC things may be held in a Value, either publicly or as a private GC
// thing.
#define JS_EXPAND_DEF(name, type, _) \
template void PreBarrierFunctor<JS::Value>::operator()<type>(type*);
JS_FOR_EACH_TRACEKIND(JS_EXPAND_DEF);
#undef JS_EXPAND_DEF
template void PreBarrierFunctor<jsid>::operator()<JS::Symbol>(JS::Symbol*);
template void PreBarrierFunctor<jsid>::operator()<JSString>(JSString*);
template <typename T>
/* static */ bool
MovableCellHasher<T>::hasHash(const Lookup& l)
{
if (!l)
return true;
return l->zoneFromAnyThread()->hasUniqueId(l);
}
template <typename T>
/* static */ bool
MovableCellHasher<T>::ensureHash(const Lookup& l)
{
if (!l)
return true;
uint64_t unusedId;
return l->zoneFromAnyThread()->getUniqueId(l, &unusedId);
}
template <typename T>
/* static */ HashNumber
MovableCellHasher<T>::hash(const Lookup& l)
{
if (!l)
return 0;
// We have to access the zone from-any-thread here: a worker thread may be
// cloning a self-hosted object from the main-thread-runtime-owned self-
// hosting zone into the off-main-thread runtime. The zone's uid lock will
// protect against multiple workers doing this simultaneously.
MOZ_ASSERT(CurrentThreadCanAccessZone(l->zoneFromAnyThread()) ||
l->zoneFromAnyThread()->isSelfHostingZone());
return l->zoneFromAnyThread()->getHashCodeInfallible(l);
}
template <typename T>
/* static */ bool
MovableCellHasher<T>::match(const Key& k, const Lookup& l)
{
// Return true if both are null or false if only one is null.
if (!k)
return !l;
if (!l)
return false;
MOZ_ASSERT(k);
MOZ_ASSERT(l);
MOZ_ASSERT(CurrentThreadCanAccessZone(l->zoneFromAnyThread()) ||
l->zoneFromAnyThread()->isSelfHostingZone());
Zone* zone = k->zoneFromAnyThread();
if (zone != l->zoneFromAnyThread())
return false;
MOZ_ASSERT(zone->hasUniqueId(k));
MOZ_ASSERT(zone->hasUniqueId(l));
// Since both already have a uid (from hash), the get is infallible.
return zone->getUniqueIdInfallible(k) == zone->getUniqueIdInfallible(l);
}
#ifdef JS_BROKEN_GCC_ATTRIBUTE_WARNING
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wattributes"
#endif // JS_BROKEN_GCC_ATTRIBUTE_WARNING
template struct JS_PUBLIC_API(MovableCellHasher<JSObject*>);
template struct JS_PUBLIC_API(MovableCellHasher<GlobalObject*>);
template struct JS_PUBLIC_API(MovableCellHasher<SavedFrame*>);
template struct JS_PUBLIC_API(MovableCellHasher<EnvironmentObject*>);
template struct JS_PUBLIC_API(MovableCellHasher<WasmInstanceObject*>);
template struct JS_PUBLIC_API(MovableCellHasher<JSScript*>);
#ifdef JS_BROKEN_GCC_ATTRIBUTE_WARNING
#pragma GCC diagnostic pop
#endif // JS_BROKEN_GCC_ATTRIBUTE_WARNING
} // namespace js
JS_PUBLIC_API(void)
JS::HeapObjectPostBarrier(JSObject** objp, JSObject* prev, JSObject* next)
{
MOZ_ASSERT(objp);
js::InternalBarrierMethods<JSObject*>::postBarrier(objp, prev, next);
}
JS_PUBLIC_API(void)
JS::HeapValuePostBarrier(JS::Value* valuep, const Value& prev, const Value& next)
{
MOZ_ASSERT(valuep);
js::InternalBarrierMethods<JS::Value>::postBarrier(valuep, prev, next);
}
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