Remove slot buffer entries in deoptimized code objects after marking.

src/heap/mark-compact.h

 // Copyright 2012 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_MARK_COMPACT_H_
 #define V8_HEAP_MARK_COMPACT_H_
 
 #include "src/base/bits.h"
 #include "src/heap/spaces.h"
 
@@ skipping 307 matching lines @@
   void Add(ObjectSlot slot) {
     DCHECK(0 <= idx_ && idx_ < kNumberOfElements);
 #ifdef DEBUG
     if (slot >= reinterpret_cast<ObjectSlot>(NUMBER_OF_SLOT_TYPES)) {
       DCHECK_NOT_NULL(*slot);
     }
 #endif
     slots_[idx_++] = slot;
   }
 
+  // Should be used for testing only.
+  ObjectSlot Get(intptr_t i) {
+    DCHECK(i >= 0 && i < kNumberOfElements);
+    return slots_[i];
+  }
+
   enum SlotType {
     EMBEDDED_OBJECT_SLOT,
     OBJECT_SLOT,
     RELOCATED_CODE_OBJECT,
     CELL_TARGET_SLOT,
     CODE_TARGET_SLOT,
     CODE_ENTRY_SLOT,
     DEBUG_TARGET_SLOT,
     NUMBER_OF_SLOT_TYPES
   };
@@ skipping 29 matching lines @@
   static int SizeOfChain(SlotsBuffer* buffer) {
     if (buffer == NULL) return 0;
     return static_cast<int>(buffer->idx_ +
                             (buffer->chain_length_ - 1) * kNumberOfElements);
   }
 
   inline bool IsFull() { return idx_ == kNumberOfElements; }
 
   inline bool HasSpaceForTypedSlot() { return idx_ < kNumberOfElements - 1; }
 
-  static void UpdateSlotsRecordedIn(Heap* heap, SlotsBuffer* buffer,
-                                    bool code_slots_filtering_required) {
+  static void UpdateSlotsRecordedIn(Heap* heap, SlotsBuffer* buffer) {
     while (buffer != NULL) {
-      if (code_slots_filtering_required) {
-        buffer->UpdateSlotsWithFilter(heap);
-      } else {
         buffer->UpdateSlots(heap);
-      }
       buffer = buffer->next();
     }
   }
 
   enum AdditionMode { FAIL_ON_OVERFLOW, IGNORE_OVERFLOW };
 
   static bool ChainLengthThresholdReached(SlotsBuffer* buffer) {
     return buffer != NULL && buffer->chain_length_ >= kChainLengthThreshold;
   }
 
@@ skipping 18 matching lines @@
   static bool AddTo(SlotsBufferAllocator* allocator,
                     SlotsBuffer** buffer_address, SlotType type, Address addr,
                     AdditionMode mode);
 
   // Eliminates all stale entries from the slots buffer, i.e., slots that
   // are not part of live objects anymore. This method must be called after
   // marking, when the whole transitive closure is known and must be called
   // before sweeping when mark bits are still intact.
   static void RemoveInvalidSlots(Heap* heap, SlotsBuffer* buffer);
 
+  // Eliminate all slots that are within the given address range.
+  static void RemoveObjectSlots(Heap* heap, SlotsBuffer* buffer,
+                                Address start_slot, Address end_slot);
+
   // Ensures that there are no invalid slots in the chain of slots buffers.
   static void VerifySlots(Heap* heap, SlotsBuffer* buffer);
 
   static const int kNumberOfElements = 1021;
 
  private:
   static const int kChainLengthThreshold = 15;
 
   intptr_t idx_;
   intptr_t chain_length_;
@@ skipping 301 matching lines @@
   void InitializeMarkingDeque();
 
   // The following four methods can just be called after marking, when the
   // whole transitive closure is known. They must be called before sweeping
   // when mark bits are still intact.
   bool IsSlotInBlackObject(Page* p, Address slot, HeapObject** out_object);
   bool IsSlotInBlackObjectSlow(Page* p, Address slot);
   bool IsSlotInLiveObject(Address slot);
   void VerifyIsSlotInLiveObject(Address slot, HeapObject* object);
 
+  // Removes all the slots in the slot buffers that are within the given
+  // address range.
+  void RemoveObjectSlots(Address start_slot, Address end_slot);
+
  private:
   class SweeperTask;
 
   explicit MarkCompactCollector(Heap* heap);
   ~MarkCompactCollector();
 
-  bool MarkInvalidatedCode();
+  void RemoveDeoptimizedCodeSlots();
   bool WillBeDeoptimized(Code* code);
   void RemoveDeadInvalidatedCode();
   void ProcessInvalidatedCode(ObjectVisitor* visitor);
   void EvictPopularEvacuationCandidate(Page* page);
   void ClearInvalidSlotsBufferEntries(PagedSpace* space);
   void ClearInvalidStoreAndSlotsBufferEntries();
 
   void StartSweeperThreads();
 
 #ifdef DEBUG
@@ skipping 267 matching lines @@
  private:
   MarkCompactCollector* collector_;
 };
 
 
 const char* AllocationSpaceName(AllocationSpace space);
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_MARK_COMPACT_H_