incremental_compactor.h

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// Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
 
#ifndef RUNTIME_VM_HEAP_INCREMENTAL_COMPACTOR_H_
#define RUNTIME_VM_HEAP_INCREMENTAL_COMPACTOR_H_
 
#include "vm/allocation.h"
 
namespace dart {
 
// Forward declarations.
class PageSpace;
class ObjectVisitor;
class IncrementalForwardingVisitor;
 
// An evacuating compactor that is incremental in the sense that building the
// remembered set is interleaved with the mutator. The evacuation and forwarding
// is not interleaved with the mutator, which would require a read barrier.
class GCIncrementalCompactor : public AllStatic {
 public:
  static void Prologue(PageSpace* old_space);
  static bool Epilogue(PageSpace* old_space);
  static void Abort(PageSpace* old_space);
 
 private:
  static bool SelectEvacuationCandidates(PageSpace* old_space);
  static void CheckFreeLists(PageSpace* old_space);
 
  static bool HasEvacuationCandidates(PageSpace* old_space);
  static void CheckPreEvacuate(PageSpace* old_space);
  static void Evacuate(PageSpace* old_space);
  static void CheckPostEvacuate(PageSpace* old_space);
  static void FreeEvacuatedPages(PageSpace* old_space);
  static void VerifyAfterIncrementalCompaction(PageSpace* old_space);
};
 
}  // namespace dart
 
#endif  // RUNTIME_VM_HEAP_INCREMENTAL_COMPACTOR_H_