- Add different types for persistent and weak persistent handles

runtime/vm/dart.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/dart.h"
 
 #include "vm/code_observers.h"
 #include "vm/dart_api_state.h"
 #include "vm/dart_entry.h"
 #include "vm/flags.h"
@@ skipping 110 matching lines @@
 #if defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64)
     // Dart VM requires at least SSE2.
     if (!CPUFeatures::sse2_supported()) {
       return "SSE2 is required.";
     }
 #endif
     PremarkingVisitor premarker(vm_isolate_);
     vm_isolate_->heap()->IterateOldObjects(&premarker);
     vm_isolate_->heap()->WriteProtect(true);
   }
+  // There is a planned and known asymmetry here: We enter one scope for the VM
+  // isolate so that we can allocate the "persistent" scoped handles for the
+  // predefined API values (such as Dart_True, Dart_False and Dart_Null).
+  Dart_EnterScope();
+  Api::InitHandles();
+

[siva, 2013/05/28 17:37:18]

At some point we should add Dart::Cleanup function to undo all
the stuff that was done here.

   Isolate::SetCurrent(NULL);  // Unregister the VM isolate from this thread.
   Isolate::SetCreateCallback(create);
   Isolate::SetInterruptCallback(interrupt);
   Isolate::SetUnhandledExceptionCallback(unhandled);
   Isolate::SetShutdownCallback(shutdown);
   return NULL;
 }
 
 
 Isolate* Dart::CreateIsolate(const char* name_prefix) {
@@ skipping 77 matching lines @@
   return predefined_handles_->handles_.AllocateScopedHandle();
 }
 
 
 bool Dart::IsReadOnlyHandle(uword address) {
   ASSERT(predefined_handles_ != NULL);
   return predefined_handles_->handles_.IsValidScopedHandle(address);
 }
 
 }  // namespace dart