Move vm_tags from isolate to thread, since we may have multiple threads in same isolate (GC, backgr…

runtime/vm/isolate.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/isolate.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 #include "platform/assert.h"
 #include "platform/json.h"
@@ skipping 750 matching lines @@
       registered_service_extension_handlers_(GrowableObjectArray::null()),
       metrics_list_head_(NULL),
       compilation_allowed_(true),
       cha_(NULL),
       next_(NULL),
       pause_loop_monitor_(NULL),
       REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_INITIALIZERS)
       REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_SCOPE_INIT)
       reusable_handles_() {
   flags_.CopyFrom(api_flags);
-  set_vm_tag(VMTag::kEmbedderTagId);
+  Thread::Current()->set_vm_tag(VMTag::kEmbedderTagId);
   set_user_tag(UserTags::kDefaultUserTag);
 }
 
 #undef REUSABLE_HANDLE_SCOPE_INIT
 #undef REUSABLE_HANDLE_INITIALIZERS
 
 Isolate::~Isolate() {
   free(name_);
   free(debugger_name_);
   delete store_buffer_;
@@ skipping 1148 matching lines @@
     if (entry.thread == mutator) {
       ThreadInterrupter::InterruptThread(mutator);
       break;
     }
   }
   return 1;
 }
 
 
 void Isolate::ProfileIdle() {
-  vm_tag_counters_.Increment(vm_tag());
+  // Currently we are only sampling the mutator thread.
+  vm_tag_counters_.Increment(VMTag::kIdleTagId);
 }
 
 
 void Isolate::set_tag_table(const GrowableObjectArray& value) {
   tag_table_ = value.raw();
 }
 
 
 void Isolate::set_current_tag(const UserTag& tag) {
   uword user_tag = tag.tag();
@@ skipping 609 matching lines @@
                            serialized_message_, serialized_message_len_);
 }
 
 
 void IsolateSpawnState::Cleanup() {
   SwitchIsolateScope switch_scope(I);
   Dart::ShutdownIsolate();
 }
 
 }  // namespace dart