Add VMMetric and some sample metrics

runtime/vm/service.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/service.h"
 
 #include "include/dart_api.h"
 #include "platform/globals.h"
 
 #include "vm/compiler.h"
@@ skipping 1577 matching lines @@
   const String& metrics_cls_name =
       String::Handle(isolate, String::New("Metrics"));
   ASSERT(!metrics_cls_name.IsNull());
   const Class& metrics_cls =
       Class::Handle(isolate, prof_lib.LookupClass(metrics_cls_name));
   ASSERT(!metrics_cls.IsNull());
   return metrics_cls.raw();
 }
 
 
+static bool HandleIsolateMetricsList(Isolate* isolate, JSONStream* js) {
+  JSONObject obj(js);
+  obj.AddProperty("type", "MetricList");
+  obj.AddProperty("id", "metrics/vm");
+  {
+    JSONArray members(&obj, "members");
+    Metric* current = isolate->metrics_list_head();
+    while (current != NULL) {
+      members.AddValue(current);
+      current = current->next();
+    }
+  }
+  return true;
+}
+
+
+static bool HandleIsolateMetric(Isolate* isolate,
+                                JSONStream* js,
+                                const char* id) {
+  Metric* current = isolate->metrics_list_head();
+  while (current != NULL) {
+    const char* name = current->name();
+    ASSERT(name != NULL);
+    if (strcmp(name, id) == 0) {
+      current->PrintJSON(js);
+      return true;
+    }
+    current = current->next();
+  }
+  PrintError(js, "Metric %s not found\n", id);
+  return true;
+}
+
+
 static bool HandleMetricsList(Isolate* isolate, JSONStream* js) {
   const Class& metrics_cls = Class::Handle(isolate, GetMetricsClass(isolate));
   const String& print_metrics_name =
       String::Handle(String::New("_printMetrics"));
   ASSERT(!print_metrics_name.IsNull());
   const Function& print_metrics = Function::Handle(
       isolate,
       metrics_cls.LookupStaticFunctionAllowPrivate(print_metrics_name));
   ASSERT(!print_metrics.IsNull());
   const Array& args = Object::empty_array();
@@ skipping 31 matching lines @@
   }
   PrintError(js, "Metric %s not found\n", id);
   return true;
 }
 
 
 static bool HandleMetrics(Isolate* isolate, JSONStream* js) {
   if (js->num_arguments() == 1) {
     return HandleMetricsList(isolate, js);
   }
+  ASSERT(js->num_arguments() > 1);
+  const char* arg = js->GetArgument(1);
+  if (strcmp(arg, "vm") == 0) {
+    if (js->num_arguments() == 2) {
+      return HandleIsolateMetricsList(isolate, js);
+    } else {
+      if (js->num_arguments() > 3) {
+        PrintError(js, "Command too long");
+        return true;
+      }
+      return HandleIsolateMetric(isolate, js, js->GetArgument(2));
+    }
+  }
   if (js->num_arguments() > 2) {
     PrintError(js, "Command too long");
     return true;
   }
-  const char* arg = js->GetArgument(1);
   return HandleMetric(isolate, js, arg);
 }
 
 
 static bool HandleObjects(Isolate* isolate, JSONStream* js) {
   REQUIRE_COLLECTION_ID("objects");
   if (js->num_arguments() < 2) {
     PrintError(js, "expected at least 2 arguments but found %" Pd "\n",
                js->num_arguments());
     return true;
@@ skipping 861 matching lines @@
   while (current != NULL) {
     if (strcmp(name, current->name()) == 0) {
       return current;
     }
     current = current->next();
   }
   return NULL;
 }
 
 }  // namespace dart