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Current File : //home/ubuntu/node-v16.18.1/deps/v8/src/heap/cppgc/garbage-collector.h
// 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.

#ifndef V8_HEAP_CPPGC_GARBAGE_COLLECTOR_H_
#define V8_HEAP_CPPGC_GARBAGE_COLLECTOR_H_

#include "src/heap/cppgc/marker.h"
#include "src/heap/cppgc/sweeper.h"

namespace cppgc {
namespace internal {

// GC interface that allows abstraction over the actual GC invocation. This is
// needed to mock/fake GC for testing.
class GarbageCollector {
 public:
  struct Config {
    using CollectionType = Marker::MarkingConfig::CollectionType;
    using StackState = cppgc::Heap::StackState;
    using MarkingType = Marker::MarkingConfig::MarkingType;
    using SweepingType = Sweeper::SweepingConfig::SweepingType;
    using FreeMemoryHandling = Sweeper::SweepingConfig::FreeMemoryHandling;
    using IsForcedGC = Marker::MarkingConfig::IsForcedGC;

    static constexpr Config ConservativeAtomicConfig() {
      return {CollectionType::kMajor, StackState::kMayContainHeapPointers,
              MarkingType::kAtomic, SweepingType::kAtomic};
    }

    static constexpr Config PreciseAtomicConfig() {
      return {CollectionType::kMajor, StackState::kNoHeapPointers,
              MarkingType::kAtomic, SweepingType::kAtomic};
    }

    static constexpr Config ConservativeIncrementalConfig() {
      return {CollectionType::kMajor, StackState::kMayContainHeapPointers,
              MarkingType::kIncremental, SweepingType::kAtomic};
    }

    static constexpr Config PreciseIncrementalConfig() {
      return {CollectionType::kMajor, StackState::kNoHeapPointers,
              MarkingType::kIncremental, SweepingType::kAtomic};
    }

    static constexpr Config
    PreciseIncrementalMarkingConcurrentSweepingConfig() {
      return {CollectionType::kMajor, StackState::kNoHeapPointers,
              MarkingType::kIncremental,
              SweepingType::kIncrementalAndConcurrent};
    }

    static constexpr Config MinorPreciseAtomicConfig() {
      return {CollectionType::kMinor, StackState::kNoHeapPointers,
              MarkingType::kAtomic, SweepingType::kAtomic};
    }

    CollectionType collection_type = CollectionType::kMajor;
    StackState stack_state = StackState::kMayContainHeapPointers;
    MarkingType marking_type = MarkingType::kAtomic;
    SweepingType sweeping_type = SweepingType::kAtomic;
    FreeMemoryHandling free_memory_handling = FreeMemoryHandling::kDoNotDiscard;
    IsForcedGC is_forced_gc = IsForcedGC::kNotForced;
  };

  // Executes a garbage collection specified in config.
  virtual void CollectGarbage(Config) = 0;
  virtual void StartIncrementalGarbageCollection(Config) = 0;

  // The current epoch that the GC maintains. The epoch is increased on every
  // GC invocation.
  virtual size_t epoch() const = 0;
};

}  // namespace internal
}  // namespace cppgc

#endif  // V8_HEAP_CPPGC_GARBAGE_COLLECTOR_H_

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