Created methods to surface zone memory information for each isolate and thread in JSON.

runtime/vm/thread_registry.cc

 // Copyright (c) 2015, 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/thread_registry.h"
 
 #include "vm/isolate.h"
+#include "vm/json_stream.h"
 #include "vm/lockers.h"
 
 namespace dart {
 
 ThreadRegistry::~ThreadRegistry() {
   // Go over the free thread list and delete the thread objects.
   {
     MonitorLocker ml(threads_lock());
     // At this point the active list should be empty.
     ASSERT(active_list_ == NULL);
@@ skipping 66 matching lines @@
 void ThreadRegistry::PrepareForGC() {
   MonitorLocker ml(threads_lock());
   Thread* thread = active_list_;
   while (thread != NULL) {
     thread->PrepareForGC();
     thread = thread->next_;
   }
 }
 
 
+#ifndef RELEASE
+void ThreadRegistry::PrintToJSONObjectLocked(JSONObject* obj) {
+  MonitorLocker ml(threads_lock());
+  {
+    JSONArray active_thread_array(obj, "active_threads");
+    PrintToJSONObjectHelper(&active_thread_array, active_list_);
+  }
+  {
+    JSONArray free_thread_array(obj, "free_threads");
+    PrintToJSONObjectHelper(&free_thread_array, free_list_);
+  }
+}
+
+
+void ThreadRegistry::PrintToJSONObjectHelper(JSONArray* arr, Thread* thread) {
+  while (thread != NULL) {
+    JSONObject thread_obj(arr);
+    thread->PrintToJSONObject(&thread_obj);
+    thread = thread->next_;
+  }
+}
+#endif
+
+
 void ThreadRegistry::AddToActiveListLocked(Thread* thread) {
   ASSERT(thread != NULL);
   ASSERT(threads_lock()->IsOwnedByCurrentThread());
   thread->next_ = active_list_;
   active_list_ = thread;
 }
 
 
 void ThreadRegistry::RemoveFromActiveListLocked(Thread* thread) {
   ASSERT(thread != NULL);
@@ skipping 33 matching lines @@
   ASSERT(thread->os_thread_ == NULL);
   ASSERT(thread->isolate_ == NULL);
   ASSERT(thread->heap_ == NULL);
   ASSERT(threads_lock()->IsOwnedByCurrentThread());
   // Add thread to the free list.
   thread->next_ = free_list_;
   free_list_ = thread;
 }
 
 }  // namespace dart