Basic tag infrastructure

runtime/vm/native_entry.cc

 // Copyright (c) 2011, 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/native_entry.h"
 
 #include "include/dart_api.h"
 
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_state.h"
@@ skipping 33 matching lines @@
   return native_call_label;
 }
 
 
 void NativeEntry::NativeCallWrapper(Dart_NativeArguments args,
                                     Dart_NativeFunction func) {
   CHECK_STACK_ALIGNMENT;
   VERIFY_ON_TRANSITION;
   NativeArguments* arguments = reinterpret_cast<NativeArguments*>(args);
   Isolate* isolate = arguments->isolate();
+  VMTagScope tagScope(isolate, VMTag::kRuntimeNativeTagId);

[siva, 2014/03/13 23:18:47]

This switches the tag to Native but we need to switch back to VM when we
re-enter into the VM using the dart API

   ApiState* state = isolate->api_state();
   ASSERT(state != NULL);
   ApiLocalScope* current_top_scope = state->top_scope();
   ApiLocalScope* scope = state->reusable_scope();
   TRACE_NATIVE_CALL("0x%" Px "", reinterpret_cast<uintptr_t>(func));
   if (scope == NULL) {
     scope = new ApiLocalScope(current_top_scope,
                               isolate->top_exit_frame_info());
     ASSERT(scope != NULL);
   } else {
@@ skipping 13 matching lines @@
     state->set_reusable_scope(scope);
   } else {
     ASSERT(state->reusable_scope() != scope);
     delete scope;
   }
   DEOPTIMIZE_ALOT;
   VERIFY_ON_TRANSITION;
 }
 
 }  // namespace dart