Intrinsify UserTag operations on all architectures

runtime/lib/profiler.cc

 // Copyright (c) 2014, 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/bootstrap_natives.h"
 
 #include "include/dart_api.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/exceptions.h"
 #include "vm/native_entry.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 
 namespace dart {
 
+DECLARE_FLAG(bool, trace_intrinsified_natives);
+
 // dart:profiler.
 
 DEFINE_NATIVE_ENTRY(UserTag_new, 2) {
   ASSERT(TypeArguments::CheckedHandle(arguments->NativeArgAt(0)).IsNull());
   GET_NON_NULL_NATIVE_ARGUMENT(String, tag_label, arguments->NativeArgAt(1));
   return UserTag::New(tag_label);
 }
 
 
 DEFINE_NATIVE_ENTRY(UserTag_label, 1) {
   const UserTag& self = UserTag::CheckedHandle(arguments->NativeArgAt(0));
   return self.label();
 }
 
 
 DEFINE_NATIVE_ENTRY(UserTag_makeCurrent, 1) {
   const UserTag& self = UserTag::CheckedHandle(arguments->NativeArgAt(0));
+  if (FLAG_trace_intrinsified_natives) {
+    OS::Print("UserTag_makeCurrent: %s\n", self.ToCString());
+  }
   self.MakeActive();
   return Object::null();
 }
 
 
 DEFINE_NATIVE_ENTRY(Profiler_getCurrentTag, 0) {
+  if (FLAG_trace_intrinsified_natives) {
+    OS::Print("Profiler_getCurrentTag\n");
+  }
   return isolate->current_tag();
 }
 
 
 DEFINE_NATIVE_ENTRY(Profiler_clearCurrentTag, 0) {
   // Use a NoGCScope to avoid creating a handle for the old current.
   NoGCScope no_gc;
   RawUserTag* old_current = isolate->current_tag();
   UserTag::ClearActive();
+  if (FLAG_trace_intrinsified_natives) {
+    OS::Print("Profiler_clearCurrentTag\n");
+  }
   return old_current;
 }
 
 }  // namespace dart