Add VMMetric and some sample metrics

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 "platform/assert.h"
 #include "platform/json.h"
 #include "vm/code_observers.h"
@@ skipping 418 matching lines @@
       stack_frame_index_(-1),
       last_allocationprofile_accumulator_reset_timestamp_(0),
       last_allocationprofile_gc_timestamp_(0),
       cha_(NULL),
       object_id_ring_(NULL),
       trace_buffer_(NULL),
       profiler_data_(NULL),
       thread_state_(NULL),
       tag_table_(GrowableObjectArray::null()),
       current_tag_(UserTag::null()),
+      metrics_list_head_(NULL),
       next_(NULL),
       REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_INITIALIZERS)
       REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_SCOPE_INIT)
       reusable_handles_() {
   set_vm_tag(VMTag::kIdleTagId);
   set_user_tag(UserTags::kDefaultUserTag);
 }
 #undef REUSABLE_HANDLE_SCOPE_INIT
 #undef REUSABLE_HANDLE_INITIALIZERS
 
@@ skipping 54 matching lines @@
   create_callback_ = NULL;
   isolates_list_monitor_ = new Monitor();
   ASSERT(isolates_list_monitor_ != NULL);
 }
 
 
 Isolate* Isolate::Init(const char* name_prefix) {
   Isolate* result = new Isolate();
   ASSERT(result != NULL);
 
+  // Initialize metrics.
+#define ISOLATE_METRIC_INIT(type, variable, name, unit)                        \
+  result->metric_##variable##_.Init(result, name, NULL, Metric::unit);
+  ISOLATE_METRIC_LIST(ISOLATE_METRIC_INIT);
+#undef ISOLATE_METRIC_INIT
+
+
   // Add to isolate list.
   AddIsolateTolist(result);
 
+
   // TODO(5411455): For now just set the recently created isolate as
   // the current isolate.
   SetCurrent(result);
 
   // Setup the isolate specific resuable handles.
 #define REUSABLE_HANDLE_ALLOCATION(object)                                     \
   result->object##_handle_ = result->AllocateReusableHandle<object>();
   REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_ALLOCATION)
 #undef REUSABLE_HANDLE_ALLOCATION
 
@@ skipping 704 matching lines @@
   }
   MonitorLocker ml(isolates_list_monitor_);
   Isolate* current = isolates_list_head_;
   while (current) {
     visitor->VisitIsolate(current);
     current = current->next_;
   }
 }
 
 
+intptr_t Isolate::IsolateListLength() {
+  MonitorLocker ml(isolates_list_monitor_);
+  intptr_t count = 0;
+  Isolate* current = isolates_list_head_;
+  while (current != NULL) {
+    count++;
+    current = current->next_;
+  }
+  return count;
+}
+
+
 void Isolate::AddIsolateTolist(Isolate* isolate) {
   MonitorLocker ml(isolates_list_monitor_);
   ASSERT(isolate != NULL);
   ASSERT(isolate->next_ == NULL);
   isolate->next_ = isolates_list_head_;
   isolates_list_head_ = isolate;
 }
 
 
 void Isolate::RemoveIsolateFromList(Isolate* isolate) {
@@ skipping 136 matching lines @@
   return func.raw();
 }
 
 
 void IsolateSpawnState::Cleanup() {
   SwitchIsolateScope switch_scope(I);
   Dart::ShutdownIsolate();
 }
 
 }  // namespace dart