Get rid of distinction between below- and above-watermark in page allocation....

src/debug.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1857 matching lines @@
       Handle<JSObject>(Debug::debug_context()->global()),
       0, NULL, &caught_exception);
 }
 
 
 void Debug::CreateScriptCache() {
   HandleScope scope;
 
   // Perform two GCs to get rid of all unreferenced scripts. The first GC gets
   // rid of all the cached script wrappers and the second gets rid of the
-  // scripts which are no longer referenced.
-  Heap::CollectAllGarbage(false);
-  Heap::CollectAllGarbage(false);
+  // scripts which are no longer referenced.  The second also sweeps precisely,
+  // which saves us doing yet another GC to make the heap iterable.
+  Heap::CollectAllGarbage(Heap::kNoGCFlags);
+  Heap::CollectAllGarbage(Heap::kMakeHeapIterableMask);
 
   ASSERT(script_cache_ == NULL);
   script_cache_ = new ScriptCache();
 
   // Scan heap for Script objects.
   int count = 0;
   HeapIterator iterator;
-  for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {
+  for (HeapObject* obj = iterator.Next(); obj != NULL; obj = iterator.Next()) {
     if (obj->IsScript() && Script::cast(obj)->HasValidSource()) {
       script_cache_->Add(Handle<Script>(Script::cast(obj)));
       count++;
     }
   }
 }
 
 
 void Debug::DestroyScriptCache() {
   // Get rid of the script cache if it was created.
@@ skipping 19 matching lines @@
   }
 
   // If the script cache is not active just return an empty array.
   ASSERT(script_cache_ != NULL);
   if (script_cache_ == NULL) {
     Factory::NewFixedArray(0);
   }
 
   // Perform GC to get unreferenced scripts evicted from the cache before
   // returning the content.
-  Heap::CollectAllGarbage(false);
+  Heap::CollectAllGarbage(Heap::kNoGCFlags);
 
   // Get the scripts from the cache.
   return script_cache_->GetScripts();
 }
 
 
 void Debug::AfterGarbageCollection() {
   // Generate events for collected scripts.
   if (script_cache_ != NULL) {
     script_cache_->ProcessCollectedScripts();
@@ skipping 1138 matching lines @@
     {
       Locker locker;
       Debugger::CallMessageDispatchHandler();
     }
   }
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal