spaces.h

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// Copyright (c) 2014, 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_SPACES_H_
#define RUNTIME_VM_HEAP_SPACES_H_
 
#include "platform/atomic.h"
#include "platform/globals.h"
 
// This file contains utilities shared by old and new space.
// TODO(koda): Create Space base class with Space::CurrentUsage().
 
namespace dart {
 
// Usage statistics for a space/generation at a particular moment in time.
class SpaceUsage {
 public:
  SpaceUsage() : capacity_in_words(0), used_in_words(0), external_in_words(0) {}
  RelaxedAtomic<intptr_t> capacity_in_words;
  RelaxedAtomic<intptr_t> used_in_words;
  RelaxedAtomic<intptr_t> external_in_words;
 
  intptr_t CombinedCapacityInWords() const {
    return capacity_in_words + external_in_words;
  }
  intptr_t CombinedUsedInWords() const {
    return used_in_words + external_in_words;
  }
};
 
enum class GCType {
  kScavenge,
  kEvacuate,
  kStartConcurrentMark,
  kMarkSweep,
  kMarkCompact,
};
 
enum class GCReason {
  kNewSpace,     // New space is full.
  kStoreBuffer,  // Store buffer is too big.
  kPromotion,    // Old space limit crossed after a scavenge.
  kOldSpace,     // Old space limit crossed, or old space allocation failed.
  kFinalize,     // Concurrent marking finished.
  kFull,         // Heap::CollectAllGarbage
  kExternal,     // Dart_NewFinalizableHandle Dart_NewWeakPersistentHandle
  kIdle,         // Dart_NotifyIdle
  kDestroyed,    // Dart_NotifyDestroyed
  kDebugging,    // service request, etc.
  kCatchUp,      // End of ForceGrowthScope or Dart_PerformanceMode_Latency.
};
 
static constexpr intptr_t kNewAllocatableSize = 256 * KB;
static constexpr intptr_t kAllocatablePageSize = 64 * KB;
 
inline bool IsAllocatableInNewSpace(intptr_t size) {
  return size <= kNewAllocatableSize;
}
inline bool IsAllocatableViaFreeLists(intptr_t size) {
  return size < kAllocatablePageSize;
}
 
}  // namespace dart
 
#endif  // RUNTIME_VM_HEAP_SPACES_H_