Expose access for reading stats counters via the...

webkit/extensions/v8/benchmarking_extension.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "Cache.h"
+#include "base/stats_table.h"
 #include "webkit/extensions/v8/benchmarking_extension.h"
 #include "webkit/glue/webkit_glue.h"
 
 namespace extensions_v8 {
 
 const char* kBenchmarkingExtensionName = "v8/Benchmarking";
 
 class BenchmarkingWrapper : public v8::Extension {
  public:
   BenchmarkingWrapper() :
       v8::Extension(kBenchmarkingExtensionName,
         "if (typeof(chromium) == 'undefined') {"
         "  chromium = {};"
         "};"
         "if (typeof(chromium.benchmarking) == 'undefined') {"
         "  chromium.benchmarking = {};"
         "};"
         "chromium.benchmarking.clearCache = function() {"
         "  native function ClearCache();"
         "  ClearCache();"
         "};"
         "chromium.benchmarking.closeConnections = function() {"
         "  native function CloseConnections();"
         "  CloseConnections();"
-        "};") {}
+        "};"
+        "chromium.benchmarking.counter = function(name) {"
+        "  native function GetCounter();"
+        "  return GetCounter(name);"
+        "};"
+        ) {}
 
   virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
       v8::Handle<v8::String> name) {
     if (name->Equals(v8::String::New("CloseConnections"))) {
       return v8::FunctionTemplate::New(CloseConnections);
     } else if (name->Equals(v8::String::New("ClearCache"))) {
       return v8::FunctionTemplate::New(ClearCache);
+    } else if (name->Equals(v8::String::New("GetCounter"))) {
+      return v8::FunctionTemplate::New(GetCounter);
     }
     return v8::Handle<v8::FunctionTemplate>();
   }
 
   static v8::Handle<v8::Value> CloseConnections(const v8::Arguments& args) {
     webkit_glue::CloseIdleConnections();
     return v8::Undefined();
   }
 
   static v8::Handle<v8::Value> ClearCache(const v8::Arguments& args) {
     // TODO(mbelshe): should be enable/disable?
     webkit_glue::SetCacheMode(false);
 
     // Disabling and re-enabling the cache forces it to flush.
     WebCore::cache()->setDisabled(true);
     WebCore::cache()->setDisabled(false);
     return v8::Undefined();
   }
+
+  static v8::Handle<v8::Value> GetCounter(const v8::Arguments& args) {
+    if (!args.Length() || !args[0]->IsString())
+      return v8::Undefined();
+
+    // Extract the name argument
+    char name[256];
+    name[0] = 'c';
+    name[1] = ':';
+    args[0]->ToString()->WriteAscii(&name[2], 0, sizeof(name) - 3);
+
+    int counter = StatsTable::current()->GetCounterValue(name);
+    return v8::Integer::New(counter);
+  }
 };
 
 v8::Extension* BenchmarkingExtension::Get() {
   return new BenchmarkingWrapper();
 }
 
 }  // namespace extensions_v8