| // Copyright 2015 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_SCAVENGER_H_ |
| #define V8_HEAP_SCAVENGER_H_ |
| |
| #include "src/heap/objects-visiting.h" |
| #include "src/heap/slot-set.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| typedef void (*ScavengingCallback)(Map* map, HeapObject** slot, |
| HeapObject* object); |
| |
| class Scavenger { |
| public: |
| explicit Scavenger(Heap* heap) : heap_(heap) {} |
| |
| // Initializes static visitor dispatch tables. |
| static void Initialize(); |
| |
| // Callback function passed to Heap::Iterate etc. Copies an object if |
| // necessary, the object might be promoted to an old space. The caller must |
| // ensure the precondition that the object is (a) a heap object and (b) in |
| // the heap's from space. |
| static inline void ScavengeObject(HeapObject** p, HeapObject* object); |
| static inline SlotCallbackResult CheckAndScavengeObject(Heap* heap, |
| Address slot_address); |
| |
| // Slow part of {ScavengeObject} above. |
| static void ScavengeObjectSlow(HeapObject** p, HeapObject* object); |
| |
| // Chooses an appropriate static visitor table depending on the current state |
| // of the heap (i.e. incremental marking, logging and profiling). |
| void SelectScavengingVisitorsTable(); |
| |
| Isolate* isolate(); |
| Heap* heap() { return heap_; } |
| |
| private: |
| Heap* heap_; |
| VisitorDispatchTable<ScavengingCallback> scavenging_visitors_table_; |
| }; |
| |
| |
| // Helper class for turning the scavenger into an object visitor that is also |
| // filtering out non-HeapObjects and objects which do not reside in new space. |
| class ScavengeVisitor : public ObjectVisitor { |
| public: |
| explicit ScavengeVisitor(Heap* heap) : heap_(heap) {} |
| |
| void VisitPointer(Object** p) override; |
| void VisitPointers(Object** start, Object** end) override; |
| |
| private: |
| inline void ScavengePointer(Object** p); |
| |
| Heap* heap_; |
| }; |
| |
| |
| // Helper class for turning the scavenger into an object visitor that is also |
| // filtering out non-HeapObjects and objects which do not reside in new space. |
| class StaticScavengeVisitor |
| : public StaticNewSpaceVisitor<StaticScavengeVisitor> { |
| public: |
| static inline void VisitPointer(Heap* heap, HeapObject* object, Object** p); |
| }; |
| |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_HEAP_SCAVENGER_H_ |