Prototype of mark-and-compact support for Harmony weak maps.

src/runtime.cc

 // Copyright 2011 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 624 matching lines @@
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_WeakMapInitialize) {
   HandleScope scope(isolate);
   ASSERT(args.length() == 1);
   CONVERT_ARG_CHECKED(JSWeakMap, weakmap, 0);
   ASSERT(weakmap->map()->inobject_properties() == 0);
   Handle<ObjectHashTable> table = isolate->factory()->NewObjectHashTable(0);
   weakmap->set_table(*table);
+  weakmap->set_next(Smi::FromInt(0));
   return *weakmap;
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_WeakMapGet) {
   NoHandleAllocation ha;
   ASSERT(args.length() == 2);
   CONVERT_ARG_CHECKED(JSWeakMap, weakmap, 0);
   // TODO (mstarzinger): Currently we cannot use JSProxy objects as keys
   // because they cannot be cast to JSObject to get an identity hash code.
@@ skipping 12143 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(false);
   }
 }
 
 
 } }  // namespace v8::internal