Experimental (somewhat): Force GCs when disposing contexts.

src/api.cc

 // Copyright 2007-2008 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 358 matching lines @@
 bool V8::IsGlobalWeak(void** obj) {
   LOG_API("IsGlobalWeak");
   if (has_shut_down) return false;
   return i::GlobalHandles::IsWeak(reinterpret_cast<i::Object**>(obj));
 }
 
 
 void V8::DisposeGlobal(void** obj) {
   LOG_API("DisposeGlobal");
   if (has_shut_down) return;
-  i::GlobalHandles::Destroy(reinterpret_cast<i::Object**>(obj));
+  i::Object** ptr = reinterpret_cast<i::Object**>(obj);
+  if ((*ptr)->IsGlobalContext()) i::Heap::NotifyContextDisposed();
+  i::GlobalHandles::Destroy(ptr);
 }
 
 // --- H a n d l e s ---
 
 
 HandleScope::HandleScope() : is_closed_(false) {
   API_ENTRY_CHECK("HandleScope::HandleScope");
   i::HandleScope::Enter(&previous_);
 }
 
@@ skipping 1810 matching lines @@
 
 
 Persistent<Context> v8::Context::New(
     v8::ExtensionConfiguration* extensions,
     v8::Handle<ObjectTemplate> global_template,
     v8::Handle<Value> global_object) {
   EnsureInitialized("v8::Context::New()");
   LOG_API("Context::New");
   ON_BAILOUT("v8::Context::New()", return Persistent<Context>());
 
+  // Give the heap a chance to cleanup if we've disposed contexts.
+  i::Heap::CollectAllGarbageIfContextDisposed();
+
   v8::Handle<ObjectTemplate> proxy_template = global_template;
   i::Handle<i::FunctionTemplateInfo> proxy_constructor;
   i::Handle<i::FunctionTemplateInfo> global_constructor;
 
   if (!global_template.IsEmpty()) {
     // Make sure that the global_template has a constructor.
     global_constructor = EnsureConstructor(Utils::OpenHandle(*global_template));
 
     // Create a fresh template for the global proxy object.
     proxy_template = ObjectTemplate::New();
@@ skipping 810 matching lines @@
       reinterpret_cast<HandleScopeImplementer*>(storage);
   List<void**>* blocks_of_archived_thread = thread_local->Blocks();
   v8::ImplementationUtilities::HandleScopeData* handle_data_of_archived_thread =
       &thread_local->handle_scope_data_;
   Iterate(v, blocks_of_archived_thread, handle_data_of_archived_thread);
 
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal