Reland "[heap] Add page evacuation mode for new->new"

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 <deque>
 
 #include "src/base/bits.h"
@@ skipping 390 matching lines @@
 class MarkCompactCollector {
  public:
   class Evacuator;
 
   class Sweeper {
    public:
     class SweeperTask;
 
     enum SweepingMode { SWEEP_ONLY, SWEEP_AND_VISIT_LIVE_OBJECTS };
     enum SkipListRebuildingMode { REBUILD_SKIP_LIST, IGNORE_SKIP_LIST };
+    enum FreeListRebuildingMode { REBUILD_FREE_LIST, IGNORE_FREE_LIST };
     enum FreeSpaceTreatmentMode { IGNORE_FREE_SPACE, ZAP_FREE_SPACE };
     enum SweepingParallelism { SWEEP_ON_MAIN_THREAD, SWEEP_IN_PARALLEL };
 
     typedef std::deque<Page*> SweepingList;
     typedef List<Page*> SweptList;
 
     template <SweepingMode sweeping_mode, SweepingParallelism parallelism,
               SkipListRebuildingMode skip_list_mode,
+              FreeListRebuildingMode free_list_mode,
               FreeSpaceTreatmentMode free_space_mode>
     static int RawSweep(PagedSpace* space, Page* p, ObjectVisitor* v);
 
     explicit Sweeper(Heap* heap)
         : heap_(heap),
           pending_sweeper_tasks_semaphore_(0),
           sweeping_in_progress_(false),
           late_pages_(false),
           num_sweeping_tasks_(0) {}
 
     bool sweeping_in_progress() { return sweeping_in_progress_; }
     bool contains_late_pages() { return late_pages_; }
 
     void AddPage(AllocationSpace space, Page* page);
     void AddLatePage(AllocationSpace space, Page* page);
 
     int ParallelSweepSpace(AllocationSpace identity, int required_freed_bytes,
                            int max_pages = 0);
-    int ParallelSweepPage(Page* page, PagedSpace* space);
+    int ParallelSweepPage(Page* page, AllocationSpace identity);
 
     void StartSweeping();
     void StartSweepingHelper(AllocationSpace space_to_start);
     void EnsureCompleted();
+    void EnsureNewSpaceCompleted();
     bool IsSweepingCompleted();
     void SweepOrWaitUntilSweepingCompleted(Page* page);
 
     void AddSweptPageSafe(PagedSpace* space, Page* page);
     Page* GetSweptPageSafe(PagedSpace* space);
 
    private:
     static const int kAllocationSpaces = LAST_PAGED_SPACE + 1;
 
     template <typename Callback>
@@ skipping 332 matching lines @@
   //          their space's free list. Active eden semispace is compacted by
   //          evacuation.
   //
 
   // If we are not compacting the heap, we simply sweep the spaces except
   // for the large object space, clearing mark bits and adding unmarked
   // regions to each space's free list.
   void SweepSpaces();
 
   void EvacuateNewSpacePrologue();
-  void EvacuateNewSpaceEpilogue();
 
   void EvacuatePagesInParallel();
 
   // The number of parallel compaction tasks, including the main thread.
   int NumberOfParallelCompactionTasks(int pages, intptr_t live_bytes);
 
   void EvacuateNewSpaceAndCandidates();
 
   void UpdatePointersAfterEvacuation();
 
@@ skipping 85 matching lines @@
  private:
   MarkCompactCollector* collector_;
 };
 
 
 const char* AllocationSpaceName(AllocationSpace space);
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_MARK_COMPACT_H_