Add VMMetric and some sample metrics

runtime/vm/isolate.h

 // 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.
 
 #ifndef VM_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/base_isolate.h"
 #include "vm/class_table.h"
 #include "vm/counters.h"
 #include "vm/handles.h"
 #include "vm/megamorphic_cache_table.h"
+#include "vm/metrics.h"
 #include "vm/random.h"
 #include "vm/store_buffer.h"
 #include "vm/tags.h"
 #include "vm/thread.h"
 #include "vm/trace_buffer.h"
 #include "vm/timer.h"
 
 namespace dart {
 
 // Forward declarations.
@@ skipping 523 matching lines @@
   uword user_tag() const {
     return user_tag_;
   }
   static intptr_t user_tag_offset() {
     return OFFSET_OF(Isolate, user_tag_);
   }
   static intptr_t current_tag_offset() {
     return OFFSET_OF(Isolate, current_tag_);
   }
 
+#define ISOLATE_METRIC_ACCESSOR(type, variable, name, unit)                    \
+  type* Get##variable##Metric() { return &metric_##variable##_; }
+  ISOLATE_METRIC_LIST(ISOLATE_METRIC_ACCESSOR);
+#undef ISOLATE_METRIC_ACCESSOR
+
+  static intptr_t IsolateListLength();
+
   RawGrowableObjectArray* tag_table() const { return tag_table_; }
   void set_tag_table(const GrowableObjectArray& value);
 
   RawUserTag* current_tag() const { return current_tag_; }
   void set_current_tag(const UserTag& tag);
 
+  Metric* metrics_list_head() {
+    return metrics_list_head_;
+  }
+
+  void set_metrics_list_head(Metric* metric) {
+    metrics_list_head_ = metric;
+  }
+
 #if defined(DEBUG)
 #define REUSABLE_HANDLE_SCOPE_ACCESSORS(object)                                \
   void set_reusable_##object##_handle_scope_active(bool value) {               \
     reusable_##object##_handle_scope_active_ = value;                          \
   }                                                                            \
   bool reusable_##object##_handle_scope_active() const {                       \
     return reusable_##object##_handle_scope_active_;                           \
   }
   REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_SCOPE_ACCESSORS)
 #undef REUSABLE_HANDLE_SCOPE_ACCESSORS
@@ skipping 84 matching lines @@
 
   IsolateProfilerData* profiler_data_;
   Mutex profiler_data_mutex_;
   InterruptableThreadState* thread_state_;
 
   VMTagCounters vm_tag_counters_;
   uword user_tag_;
   RawGrowableObjectArray* tag_table_;
   RawUserTag* current_tag_;
 
+  Metric* metrics_list_head_;
+
   Counters counters_;
 
   // Isolate list next pointer.
   Isolate* next_;
 
   // Reusable handles support.
 #define REUSABLE_HANDLE_FIELDS(object)                                         \
   object* object##_handle_;
   REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_FIELDS)
 #undef REUSABLE_HANDLE_FIELDS
 
 #if defined(DEBUG)
 #define REUSABLE_HANDLE_SCOPE_VARIABLE(object)                                 \
   bool reusable_##object##_handle_scope_active_;
   REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_SCOPE_VARIABLE);
 #undef REUSABLE_HANDLE_SCOPE_VARIABLE
 #endif  // defined(DEBUG)
 
+#define ISOLATE_METRIC_VARIABLE(type, variable, name, unit)                    \
+  type metric_##variable##_;
+  ISOLATE_METRIC_LIST(ISOLATE_METRIC_VARIABLE);
+#undef ISOLATE_METRIC_VARIABLE
+
   VMHandles reusable_handles_;
 
   static Dart_IsolateCreateCallback create_callback_;
   static Dart_IsolateInterruptCallback interrupt_callback_;
   static Dart_IsolateUnhandledExceptionCallback unhandled_exception_callback_;
   static Dart_IsolateShutdownCallback shutdown_callback_;
   static Dart_FileOpenCallback file_open_callback_;
   static Dart_FileReadCallback file_read_callback_;
   static Dart_FileWriteCallback file_write_callback_;
   static Dart_FileCloseCallback file_close_callback_;
@@ skipping 105 matching lines @@
   char* script_url_;
   char* library_url_;
   char* class_name_;
   char* function_name_;
   char* exception_callback_name_;
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_