Reland of land concurrent sweeping of code space.

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/v8.h"
 
 #include "src/base/bits.h"
 #include "src/base/platform/platform.h"
 #include "src/full-codegen/full-codegen.h"
 #include "src/heap/mark-compact.h"
@@ skipping 57 matching lines @@
   if (page_mode_ == kOnePageOnly) return false;
   Page* cur_page;
   if (cur_addr_ == NULL) {
     cur_page = space_->anchor();
   } else {
     cur_page = Page::FromAddress(cur_addr_ - 1);
     DCHECK(cur_addr_ == cur_page->area_end());
   }
   cur_page = cur_page->next_page();
   if (cur_page == space_->anchor()) return false;
+  cur_page->heap()->mark_compact_collector()->SweepOrWaitUntilSweepingCompleted(
+      cur_page);
   cur_addr_ = cur_page->area_start();
   cur_end_ = cur_page->area_end();
   DCHECK(cur_page->WasSwept() || cur_page->SweepingCompleted());
   return true;
 }
 
 
 // -----------------------------------------------------------------------------
 // CodeRange
 
@@ skipping 3053 matching lines @@
     object->ShortPrint();
     PrintF("\n");
   }
   printf(" --------------------------------------\n");
   printf(" Marked: %x, LiveCount: %x\n", mark_size, LiveBytes());
 }
 
 #endif  // DEBUG
 }  // namespace internal
 }  // namespace v8