Remove conservative sweeping.

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/heap/spaces.h"
 
 namespace v8 {
@@ skipping 526 matching lines @@
   static inline bool IsMarked(Object* obj);
 
   inline Heap* heap() const { return heap_; }
   inline Isolate* isolate() const;
 
   CodeFlusher* code_flusher() { return code_flusher_; }
   inline bool is_code_flushing_enabled() const { return code_flusher_ != NULL; }
   void EnableCodeFlushing(bool enable);
 
   enum SweeperType {
-    PARALLEL_CONSERVATIVE,
-    CONCURRENT_CONSERVATIVE,
-    PARALLEL_PRECISE,
-    CONCURRENT_PRECISE,
-    PRECISE
+    PARALLEL_SWEEPING,
+    CONCURRENT_SWEEPING,
+    SEQUENTIAL_SWEEPING
   };
 
   enum SweepingParallelism { SWEEP_ON_MAIN_THREAD, SWEEP_IN_PARALLEL };
 
 #ifdef VERIFY_HEAP
   void VerifyMarkbitsAreClean();
   static void VerifyMarkbitsAreClean(PagedSpace* space);
   static void VerifyMarkbitsAreClean(NewSpace* space);
   void VerifyWeakEmbeddedObjectsInCode();
   void VerifyOmittedMapChecks();
 #endif
 
-  // Sweep a single page from the given space conservatively.
-  // Returns the size of the biggest continuous freed memory chunk in bytes.
-  template <SweepingParallelism type>
-  static int SweepConservatively(PagedSpace* space, FreeList* free_list,
-                                 Page* p);
-
   INLINE(static bool ShouldSkipEvacuationSlotRecording(Object** anchor)) {
     return Page::FromAddress(reinterpret_cast<Address>(anchor))
         ->ShouldSkipEvacuationSlotRecording();
   }
 
   INLINE(static bool ShouldSkipEvacuationSlotRecording(Object* host)) {
     return Page::FromAddress(reinterpret_cast<Address>(host))
         ->ShouldSkipEvacuationSlotRecording();
   }
 
@@ skipping 106 matching lines @@
     SWEEP_SPACES,
     ENCODE_FORWARDING_ADDRESSES,
     UPDATE_POINTERS,
     RELOCATE_OBJECTS
   };
 
   // The current stage of the collector.
   CollectorState state_;
 #endif
 
-  // Global flag that forces sweeping to be precise, so we can traverse the
-  // heap.
-  bool sweep_precisely_;
-
   bool reduce_memory_footprint_;
 
   bool abort_incremental_marking_;
 
   MarkingParity marking_parity_;
 
   // True if we are collecting slots to perform evacuation from evacuation
   // candidates.
   bool compacting_;
 
@@ skipping 246 matching lines @@
  private:
   MarkCompactCollector* collector_;
 };
 
 
 const char* AllocationSpaceName(AllocationSpace space);
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_MARK_COMPACT_H_