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StoreBuffer.cpp
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StoreBuffer.cpp
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* 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/StoreBuffer-inl.h"
#include "mozilla/Assertions.h"
#include "gc/Statistics.h"
#include "vm/ArgumentsObject.h"
#include "vm/Runtime.h"
#include "gc/GC-inl.h"
using namespace js;
using namespace js::gc;
void StoreBuffer::GenericBuffer::trace(StoreBuffer* owner, JSTracer* trc) {
mozilla::ReentrancyGuard g(*owner);
MOZ_ASSERT(owner->isEnabled());
if (!storage_) {
return;
}
for (LifoAlloc::Enum e(*storage_); !e.empty();) {
unsigned size = *e.read<unsigned>();
BufferableRef* edge = e.read<BufferableRef>(size);
edge->trace(trc);
}
}
void StoreBuffer::checkEmpty() const {
MOZ_ASSERT(bufferVal.isEmpty());
MOZ_ASSERT(bufferCell.isEmpty());
MOZ_ASSERT(bufferSlot.isEmpty());
MOZ_ASSERT(bufferWholeCell.isEmpty());
MOZ_ASSERT(bufferGeneric.isEmpty());
}
bool StoreBuffer::enable() {
if (enabled_) {
return true;
}
checkEmpty();
if (!bufferWholeCell.init() || !bufferGeneric.init()) {
return false;
}
enabled_ = true;
return true;
}
void StoreBuffer::disable() {
checkEmpty();
if (!enabled_) {
return;
}
aboutToOverflow_ = false;
enabled_ = false;
}
void StoreBuffer::clear() {
if (!enabled_) {
return;
}
aboutToOverflow_ = false;
cancelIonCompilations_ = false;
bufferVal.clear();
bufferCell.clear();
bufferSlot.clear();
bufferWholeCell.clear();
bufferGeneric.clear();
}
void StoreBuffer::setAboutToOverflow(JS::gcreason::Reason reason) {
if (!aboutToOverflow_) {
aboutToOverflow_ = true;
runtime_->gc.stats().count(gcstats::COUNT_STOREBUFFER_OVERFLOW);
}
nursery_.requestMinorGC(reason);
}
void StoreBuffer::addSizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf,
JS::GCSizes* sizes) {
sizes->storeBufferVals += bufferVal.sizeOfExcludingThis(mallocSizeOf);
sizes->storeBufferCells += bufferCell.sizeOfExcludingThis(mallocSizeOf);
sizes->storeBufferSlots += bufferSlot.sizeOfExcludingThis(mallocSizeOf);
sizes->storeBufferWholeCells +=
bufferWholeCell.sizeOfExcludingThis(mallocSizeOf);
sizes->storeBufferGenerics += bufferGeneric.sizeOfExcludingThis(mallocSizeOf);
}
ArenaCellSet ArenaCellSet::Empty;
ArenaCellSet::ArenaCellSet(Arena* arena, ArenaCellSet* next)
: arena(arena),
next(next)
#ifdef DEBUG
,
minorGCNumberAtCreation(
arena->zone->runtimeFromMainThread()->gc.minorGCCount())
#endif
{
MOZ_ASSERT(arena);
MOZ_ASSERT(bits.isAllClear());
}
ArenaCellSet* StoreBuffer::WholeCellBuffer::allocateCellSet(Arena* arena) {
Zone* zone = arena->zone;
JSRuntime* rt = zone->runtimeFromMainThread();
if (!rt->gc.nursery().isEnabled()) {
return nullptr;
}
AutoEnterOOMUnsafeRegion oomUnsafe;
auto cells = storage_->new_<ArenaCellSet>(arena, head_);
if (!cells) {
oomUnsafe.crash("Failed to allocate ArenaCellSet");
}
arena->bufferedCells() = cells;
head_ = cells;
if (isAboutToOverflow()) {
rt->gc.storeBuffer().setAboutToOverflow(
JS::gcreason::FULL_WHOLE_CELL_BUFFER);
}
return cells;
}
void StoreBuffer::WholeCellBuffer::clear() {
for (ArenaCellSet* set = head_; set; set = set->next) {
set->arena->bufferedCells() = &ArenaCellSet::Empty;
}
head_ = nullptr;
if (storage_) {
storage_->used() ? storage_->releaseAll() : storage_->freeAll();
}
}
template struct StoreBuffer::MonoTypeBuffer<StoreBuffer::ValueEdge>;
template struct StoreBuffer::MonoTypeBuffer<StoreBuffer::CellPtrEdge>;
template struct StoreBuffer::MonoTypeBuffer<StoreBuffer::SlotsEdge>;