Expose counters in javascript.

src/extensions/statistics-extension.cc

Index: src/extensions/statistics-extension.cc
diff --git a/src/extensions/statistics-extension.cc b/src/extensions/statistics-extension.cc
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+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "statistics-extension.h"
+
+namespace v8 {
+namespace internal {
+
+const char* const StatisticsExtension::kSource =
+    "native function getV8Statistics();";
+
+
+v8::Handle<v8::FunctionTemplate> StatisticsExtension::GetNativeFunction(
+    v8::Handle<v8::String> str) {
+  ASSERT(strcmp(*v8::String::AsciiValue(str), "getV8Statistics") == 0);
+  return v8::FunctionTemplate::New(StatisticsExtension::GetCounters);
+}
+
+
+v8::Handle<v8::Value> StatisticsExtension::GetCounters(
+    const v8::Arguments& args) {
+  Isolate* isolate = Isolate::Current();
+  Heap* heap = isolate->heap();
+  if (args.Length() > 0) {  // GC if first argument evaluates to true.
+    if (args[0]->IsBoolean() && args[0]->ToBoolean()->Value()) {
+      heap->CollectAllGarbage(Heap::kNoGCFlags, "counters extension");
+    }
+  }
+
+  Counters* counters = isolate->counters();
+  v8::Local<v8::Object> result = v8::Object::New();
+
+  StatsCounter* counter = NULL;
+
+#define ADD_COUNTER(name, caption)                                             \
+  counter = counters->name();                                                  \
+  if (counter->Enabled())                                                      \
+    result->Set(v8::String::New(#name),                                        \
+        v8::Number::New(*counter->GetInternalPointer()));
+
+  STATS_COUNTER_LIST_1(ADD_COUNTER)
+  STATS_COUNTER_LIST_2(ADD_COUNTER)
+#undef ADD_COUNTER
+#define ADD_COUNTER(name)                                                      \
+  counter = counters->count_of_##name();                                       \
+  if (counter->Enabled())                                                      \
+    result->Set(v8::String::New("count_of_" #name),                            \
+        v8::Number::New(*counter->GetInternalPointer()));                      \
+  counter = counters->size_of_##name();                                        \
+  if (counter->Enabled())                                                      \
+    result->Set(v8::String::New("size_of_" #name),                             \
+        v8::Number::New(*counter->GetInternalPointer()));
+
+  INSTANCE_TYPE_LIST(ADD_COUNTER)
+#undef ADD_COUNTER
+#define ADD_COUNTER(name)                                                      \
+  result->Set(v8::String::New("count_of_CODE_TYPE_" #name),                    \
+      v8::Number::New(                                                         \
+          *counters->count_of_CODE_TYPE_##name()->GetInternalPointer()));      \
+  result->Set(v8::String::New("size_of_CODE_TYPE_" #name),                     \
+        v8::Number::New(                                                       \
+            *counters->size_of_CODE_TYPE_##name()->GetInternalPointer()));
+
+  CODE_KIND_LIST(ADD_COUNTER)
+#undef ADD_COUNTER
+
+  return result;
+}
+
+
+void StatisticsExtension::Register() {
+  static StatisticsExtension statistics_extension;
+  static v8::DeclareExtension declaration(&statistics_extension);
+}
+
+} }  // namespace v8::internal