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// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/heap/cppgc/heap-base.h"
#include "include/cppgc/heap-consistency.h"
#include "src/base/platform/platform.h"
#include "src/base/sanitizer/lsan-page-allocator.h"
#include "src/heap/base/stack.h"
#include "src/heap/cppgc/globals.h"
#include "src/heap/cppgc/heap-object-header.h"
#include "src/heap/cppgc/heap-page.h"
#include "src/heap/cppgc/heap-statistics-collector.h"
#include "src/heap/cppgc/heap-visitor.h"
#include "src/heap/cppgc/marking-verifier.h"
#include "src/heap/cppgc/object-view.h"
#include "src/heap/cppgc/page-memory.h"
#include "src/heap/cppgc/platform.h"
#include "src/heap/cppgc/prefinalizer-handler.h"
#include "src/heap/cppgc/stats-collector.h"
namespace cppgc {
namespace internal {
namespace {
class ObjectSizeCounter : private HeapVisitor<ObjectSizeCounter> {
friend class HeapVisitor<ObjectSizeCounter>;
public:
size_t GetSize(RawHeap& heap) {
Traverse(heap);
return accumulated_size_;
}
private:
static size_t ObjectSize(const HeapObjectHeader& header) {
return ObjectView(header).Size();
}
bool VisitHeapObjectHeader(HeapObjectHeader& header) {
if (header.IsFree()) return true;
accumulated_size_ += ObjectSize(header);
return true;
}
size_t accumulated_size_ = 0;
};
} // namespace
HeapBase::HeapBase(
std::shared_ptr<cppgc::Platform> platform,
const std::vector<std::unique_ptr<CustomSpaceBase>>& custom_spaces,
StackSupport stack_support)
: raw_heap_(this, custom_spaces),
platform_(std::move(platform)),
oom_handler_(std::make_unique<FatalOutOfMemoryHandler>(this)),
#if defined(LEAK_SANITIZER)
lsan_page_allocator_(std::make_unique<v8::base::LsanPageAllocator>(
platform_->GetPageAllocator())),
#endif // LEAK_SANITIZER
#if defined(CPPGC_CAGED_HEAP)
caged_heap_(*this, *page_allocator()),
page_backend_(std::make_unique<PageBackend>(caged_heap_.allocator(),
*oom_handler_.get())),
#else // !CPPGC_CAGED_HEAP
page_backend_(std::make_unique<PageBackend>(*page_allocator(),
*oom_handler_.get())),
#endif // !CPPGC_CAGED_HEAP
stats_collector_(std::make_unique<StatsCollector>(platform_.get())),
stack_(std::make_unique<heap::base::Stack>(
v8::base::Stack::GetStackStart())),
prefinalizer_handler_(std::make_unique<PreFinalizerHandler>(*this)),
compactor_(raw_heap_),
object_allocator_(raw_heap_, *page_backend_, *stats_collector_,
*prefinalizer_handler_),
sweeper_(*this),
strong_persistent_region_(*oom_handler_.get()),
weak_persistent_region_(*oom_handler_.get()),
strong_cross_thread_persistent_region_(*oom_handler_.get()),
weak_cross_thread_persistent_region_(*oom_handler_.get()),
stack_support_(stack_support) {
stats_collector_->RegisterObserver(
&allocation_observer_for_PROCESS_HEAP_STATISTICS_);
}
HeapBase::~HeapBase() = default;
PageAllocator* HeapBase::page_allocator() const {
#if defined(LEAK_SANITIZER)
return lsan_page_allocator_.get();
#else // !LEAK_SANITIZER
return platform_->GetPageAllocator();
#endif // !LEAK_SANITIZER
}
size_t HeapBase::ObjectPayloadSize() const {
return ObjectSizeCounter().GetSize(const_cast<RawHeap&>(raw_heap()));
}
size_t HeapBase::ExecutePreFinalizers() {
#ifdef CPPGC_ALLOW_ALLOCATIONS_IN_PREFINALIZERS
// Allocations in pre finalizers should not trigger another GC.
cppgc::subtle::NoGarbageCollectionScope no_gc_scope(*this);
#else
// Pre finalizers are forbidden from allocating objects.
cppgc::subtle::DisallowGarbageCollectionScope no_gc_scope(*this);
#endif // CPPGC_ALLOW_ALLOCATIONS_IN_PREFINALIZERS
prefinalizer_handler_->InvokePreFinalizers();
return prefinalizer_handler_->ExtractBytesAllocatedInPrefinalizers();
}
#if defined(CPPGC_YOUNG_GENERATION)
void HeapBase::ResetRememberedSet() {
class AllLABsAreEmpty final : protected HeapVisitor<AllLABsAreEmpty> {
friend class HeapVisitor<AllLABsAreEmpty>;
public:
explicit AllLABsAreEmpty(RawHeap& raw_heap) { Traverse(raw_heap); }
bool value() const { return !some_lab_is_set_; }
protected:
bool VisitNormalPageSpace(NormalPageSpace& space) {
some_lab_is_set_ |= space.linear_allocation_buffer().size();
return true;
}
private:
bool some_lab_is_set_ = false;
};
DCHECK(AllLABsAreEmpty(raw_heap()).value());
caged_heap().local_data().age_table.Reset(&caged_heap().allocator());
remembered_slots().clear();
}
#endif // defined(CPPGC_YOUNG_GENERATION)
void HeapBase::Terminate() {
DCHECK(!IsMarking());
CHECK(!in_disallow_gc_scope());
sweeper().FinishIfRunning();
constexpr size_t kMaxTerminationGCs = 20;
size_t gc_count = 0;
bool more_termination_gcs_needed = false;
do {
CHECK_LT(gc_count++, kMaxTerminationGCs);
// Clear root sets.
strong_persistent_region_.ClearAllUsedNodes();
weak_persistent_region_.ClearAllUsedNodes();
{
PersistentRegionLock guard;
strong_cross_thread_persistent_region_.ClearAllUsedNodes();
weak_cross_thread_persistent_region_.ClearAllUsedNodes();
}
stats_collector()->NotifyMarkingStarted(
GarbageCollector::Config::CollectionType::kMajor,
GarbageCollector::Config::IsForcedGC::kForced);
object_allocator().ResetLinearAllocationBuffers();
stats_collector()->NotifyMarkingCompleted(0);
ExecutePreFinalizers();
sweeper().Start(
{Sweeper::SweepingConfig::SweepingType::kAtomic,
Sweeper::SweepingConfig::CompactableSpaceHandling::kSweep});
sweeper().NotifyDoneIfNeeded();
more_termination_gcs_needed =
strong_persistent_region_.NodesInUse() ||
weak_persistent_region_.NodesInUse() || [this]() {
PersistentRegionLock guard;
return strong_cross_thread_persistent_region_.NodesInUse() ||
weak_cross_thread_persistent_region_.NodesInUse();
}();
} while (more_termination_gcs_needed);
object_allocator().Terminate();
disallow_gc_scope_++;
CHECK_EQ(0u, strong_persistent_region_.NodesInUse());
CHECK_EQ(0u, weak_persistent_region_.NodesInUse());
CHECK_EQ(0u, strong_cross_thread_persistent_region_.NodesInUse());
CHECK_EQ(0u, weak_cross_thread_persistent_region_.NodesInUse());
}
HeapStatistics HeapBase::CollectStatistics(
HeapStatistics::DetailLevel detail_level) {
if (detail_level == HeapStatistics::DetailLevel::kBrief) {
return {stats_collector_->allocated_memory_size(),
stats_collector_->resident_memory_size(),
stats_collector_->allocated_object_size(),
HeapStatistics::DetailLevel::kBrief,
{},
{}};
}
sweeper_.FinishIfRunning();
object_allocator_.ResetLinearAllocationBuffers();
return HeapStatisticsCollector().CollectDetailedStatistics(this);
}
} // namespace internal
} // namespace cppgc
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