[heap] Minor MC: Implement page moving

src/heap/spaces.cc

 // Copyright 2011 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.
 
 #include "src/heap/spaces.h"
 
 #include <utility>
 
 #include "src/base/bits.h"
 #include "src/base/platform/platform.h"
@@ skipping 38 matching lines @@
          owner == page->heap()->code_space());
 #endif  // DEBUG
 }
 
 // We have hit the end of the page and should advance to the next block of
 // objects.  This happens at the end of the page.
 bool HeapObjectIterator::AdvanceToNextPage() {
   DCHECK_EQ(cur_addr_, cur_end_);
   if (current_page_ == page_range_.end()) return false;
   Page* cur_page = *(current_page_++);
-  space_->heap()
-      ->mark_compact_collector()
-      ->sweeper()
-      .SweepOrWaitUntilSweepingCompleted(cur_page);
+  Heap* heap = space_->heap();
+
+  heap->mark_compact_collector()->sweeper().SweepOrWaitUntilSweepingCompleted(
+      cur_page);
+  if (cur_page->IsFlagSet(Page::SWEEP_TO_ITERATE))
+    heap->minor_mark_compact_collector()->MakeIterable(
+        cur_page, MarkingTreatmentMode::CLEAR,
+        FreeSpaceTreatmentMode::IGNORE_FREE_SPACE);
   cur_addr_ = cur_page->area_start();
   cur_end_ = cur_page->area_end();
   DCHECK(cur_page->SweepingDone());
   return true;
 }
 
 PauseAllocationObserversScope::PauseAllocationObserversScope(Heap* heap)
     : heap_(heap) {
   AllSpaces spaces(heap_);
   for (Space* space = spaces.next(); space != NULL; space = spaces.next()) {
@@ skipping 3310 matching lines @@
     PrintF("\n");
   }
   printf(" --------------------------------------\n");
   printf(" Marked: %x, LiveCount: %" V8PRIdPTR "\n", mark_size,
          MarkingState::Internal(this).live_bytes());
 }
 
 #endif  // DEBUG
 }  // namespace internal
 }  // namespace v8