Concurrent/parallel precise sweeping.

src/spaces.cc

Index: src/spaces.cc
diff --git a/src/spaces.cc b/src/spaces.cc
index 86572d7a8b9df27a9c1280aaa9d12adf0b4a353a..2489d606a96633ec0292bd93818b54ede5d21841 100644
--- a/src/spaces.cc
+++ b/src/spaces.cc
@@ -67,7 +67,7 @@ void HeapObjectIterator::Initialize(PagedSpace* space,
                                     HeapObjectIterator::PageMode mode,
                                     HeapObjectCallback size_f) {
   // Check that we actually can iterate this space.
-  ASSERT(space->is_iterable());
+  ASSERT(space->swept_precisely());
 
   space_ = space;
   cur_addr_ = cur;
@@ -479,7 +479,7 @@ MemoryChunk* MemoryChunk::Initialize(Heap* heap,
   chunk->write_barrier_counter_ = kWriteBarrierCounterGranularity;
   chunk->progress_bar_ = 0;
   chunk->high_water_mark_ = static_cast<int>(area_start - base);
-  chunk->set_parallel_sweeping(PARALLEL_SWEEPING_DONE);
+  chunk->set_parallel_sweeping(SWEEPING_DONE);
   chunk->available_in_small_free_list_ = 0;
   chunk->available_in_medium_free_list_ = 0;
   chunk->available_in_large_free_list_ = 0;
@@ -935,7 +935,7 @@ PagedSpace::PagedSpace(Heap* heap,
                        Executability executable)
     : Space(heap, id, executable),
       free_list_(this),
-      is_iterable_(true),
+      swept_precisely_(true),
       unswept_free_bytes_(0),
       end_of_unswept_pages_(NULL) {
   if (id == CODE_SPACE) {
@@ -1157,7 +1157,7 @@ void PagedSpace::Print() { }
 #ifdef VERIFY_HEAP
 void PagedSpace::Verify(ObjectVisitor* visitor) {
   // We can only iterate over the pages if they were swept precisely.
-  if (!is_iterable_) return;
+  if (!swept_precisely_) return;
 
   bool allocation_pointer_found_in_space =
       (allocation_info_.top() == allocation_info_.limit());
@@ -2775,7 +2775,7 @@ void PagedSpace::ReportStatistics() {
              ", available: %" V8_PTR_PREFIX "d, %%%d\n",
          Capacity(), Waste(), Available(), pct);
 
-  if (!is_iterable_) return;
+  if (!swept_precisely_) return;
   ClearHistograms(heap()->isolate());
   HeapObjectIterator obj_it(this);
   for (HeapObject* obj = obj_it.Next(); obj != NULL; obj = obj_it.Next())