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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.h"
#include "src/heap/base/stack.h"
#include "src/heap/cppgc/garbage-collector.h"
#include "src/heap/cppgc/gc-invoker.h"
#include "src/heap/cppgc/heap-object-header-inl.h"
#include "src/heap/cppgc/heap-visitor.h"
#include "src/heap/cppgc/marker.h"
#include "src/heap/cppgc/prefinalizer-handler.h"
namespace cppgc {
namespace {
void VerifyCustomSpaces(
const std::vector<std::unique_ptr<CustomSpaceBase>>& custom_spaces) {
// Ensures that user-provided custom spaces have indices that form a sequence
// starting at 0.
#ifdef DEBUG
for (size_t i = 0; i < custom_spaces.size(); ++i) {
DCHECK_EQ(i, custom_spaces[i]->GetCustomSpaceIndex().value);
}
#endif // DEBUG
}
} // namespace
std::unique_ptr<Heap> Heap::Create(std::shared_ptr<cppgc::Platform> platform,
cppgc::Heap::HeapOptions options) {
DCHECK(platform.get());
VerifyCustomSpaces(options.custom_spaces);
return std::make_unique<internal::Heap>(std::move(platform),
std::move(options));
}
void Heap::ForceGarbageCollectionSlow(const char* source, const char* reason,
Heap::StackState stack_state) {
internal::Heap::From(this)->CollectGarbage(
{internal::GarbageCollector::Config::CollectionType::kMajor,
stack_state});
}
AllocationHandle& Heap::GetAllocationHandle() {
return internal::Heap::From(this)->object_allocator();
}
namespace internal {
namespace {
class Unmarker final : private HeapVisitor<Unmarker> {
friend class HeapVisitor<Unmarker>;
public:
explicit Unmarker(RawHeap* heap) { Traverse(heap); }
private:
bool VisitHeapObjectHeader(HeapObjectHeader* header) {
if (header->IsMarked()) header->Unmark();
return true;
}
};
void CheckConfig(Heap::Config config) {
CHECK_WITH_MSG(
(config.collection_type != Heap::Config::CollectionType::kMinor) ||
(config.stack_state == Heap::Config::StackState::kNoHeapPointers),
"Minor GCs with stack is currently not supported");
}
} // namespace
// static
cppgc::LivenessBroker LivenessBrokerFactory::Create() {
return cppgc::LivenessBroker();
}
Heap::Heap(std::shared_ptr<cppgc::Platform> platform,
cppgc::Heap::HeapOptions options)
: HeapBase(platform, options.custom_spaces.size()),
gc_invoker_(this, platform_.get(), options.stack_support),
growing_(&gc_invoker_, stats_collector_.get(),
options.resource_constraints) {}
Heap::~Heap() {
NoGCScope no_gc(*this);
// Finish already running GC if any, but don't finalize live objects.
sweeper_.Finish();
}
void Heap::CollectGarbage(Config config) {
CheckConfig(config);
if (in_no_gc_scope()) return;
epoch_++;
#if defined(CPPGC_YOUNG_GENERATION)
if (config.collection_type == Config::CollectionType::kMajor)
Unmarker unmarker(&raw_heap());
#endif
// "Marking".
marker_ = std::make_unique<Marker>(AsBase());
const Marker::MarkingConfig marking_config{
config.collection_type, config.stack_state, config.marking_type};
marker_->StartMarking(marking_config);
marker_->FinishMarking(marking_config);
// "Sweeping and finalization".
{
// Pre finalizers are forbidden from allocating objects
ObjectAllocator::NoAllocationScope no_allocation_scope_(object_allocator_);
marker_->ProcessWeakness();
prefinalizer_handler_->InvokePreFinalizers();
}
marker_.reset();
{
NoGCScope no_gc(*this);
sweeper_.Start(config.sweeping_type);
}
}
} // namespace internal
} // namespace cppgc
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