Preliminary Harmony weak maps API implementation.

src/bootstrapper.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 1662 matching lines @@
 
 bool Genesis::InstallExperimentalNatives() {
   for (int i = ExperimentalNatives::GetDebuggerCount();
        i < ExperimentalNatives::GetBuiltinsCount();
        i++) {
     if (FLAG_harmony_proxies &&
         strcmp(ExperimentalNatives::GetScriptName(i).start(),
                "native proxy.js") == 0) {
       if (!CompileExperimentalBuiltin(isolate(), i)) return false;
     }
+    if (FLAG_harmony_weakmaps &&
+        strcmp(ExperimentalNatives::GetScriptName(i).start(),
+               "native weakmap.js") == 0) {
+      if (!CompileExperimentalBuiltin(isolate(), i)) return false;
+    }
   }
 
   InstallExperimentalNativeFunctions();
 
   return true;
 }
 
 
 static Handle<JSObject> ResolveBuiltinIdHolder(
     Handle<Context> global_context,
@@ skipping 469 matching lines @@
     InstallJSFunctionResultCaches();
     InitializeNormalizedMapCaches();
     if (!InstallNatives()) return;
 
     MakeFunctionInstancePrototypeWritable();
 
     if (!ConfigureGlobalObjects(global_template)) return;
     isolate->counters()->contexts_created_from_scratch()->Increment();
   }
 
+  // TODO(mstarzinger): Move this into Genesis::InitializeGlobal once we no
+  // longer need to live behind a flag, so WeakMap gets added to the snapshot.
+  Handle<JSObject> global = Handle<JSObject>(global_context()->global());
+  if (FLAG_harmony_weakmaps) {  // -- W e a k M a p
+     Handle<JSFunction> weakmap_fun =
+        InstallFunction(global, "WeakMap", JS_WEAKMAP_TYPE, JSWeakMap::kSize,
+                        isolate->initial_object_prototype(),
+                        Builtins::kIllegal, true);
+    //global_context()->set_weakmap_function(*weakmap_fun);
+  }
+
   // Install experimental natives.
   if (!InstallExperimentalNatives()) return;
 
   result_ = global_context_;
 }
 
 
 // Support for thread preemption.
 
 // Reserve space for statics needing saving and restoring.
@@ skipping 16 matching lines @@
   return from + sizeof(NestingCounterType);
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   ASSERT(!IsActive());
 }
 
 } }  // namespace v8::internal