Functions in d8 to turn the profiler on/off (enableProfiler() and disableProfiler()).

src/d8.cc

 // Copyright 2011 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
@@ skipping 192 matching lines @@
     int n = static_cast<int>(fwrite(*str, sizeof(**str), str.length(), stdout));
     if (n != str.length()) {
       printf("Error in fwrite\n");
       exit(1);
     }
   }
   return Undefined();
 }
 
 
+Handle<Value> Shell::EnableProfiler(const Arguments& args) {
+  V8::ResumeProfiler();
+  return Undefined();
+}
+
+
+Handle<Value> Shell::DisableProfiler(const Arguments& args) {
+  V8::PauseProfiler();
+  return Undefined();
+}
+
+
 Handle<Value> Shell::Read(const Arguments& args) {
   String::Utf8Value file(args[0]);
   if (*file == NULL) {
     return ThrowException(String::New("Error loading file"));
   }
   Handle<String> source = ReadFile(*file);
   if (source.IsEmpty()) {
     return ThrowException(String::New("Error loading file"));
   }
   return source;
@@ skipping 426 matching lines @@
 Handle<ObjectTemplate> Shell::CreateGlobalTemplate() {
   Handle<ObjectTemplate> global_template = ObjectTemplate::New();
   global_template->Set(String::New("print"), FunctionTemplate::New(Print));
   global_template->Set(String::New("write"), FunctionTemplate::New(Write));
   global_template->Set(String::New("read"), FunctionTemplate::New(Read));
   global_template->Set(String::New("readline"),
                        FunctionTemplate::New(ReadLine));
   global_template->Set(String::New("load"), FunctionTemplate::New(Load));
   global_template->Set(String::New("quit"), FunctionTemplate::New(Quit));
   global_template->Set(String::New("version"), FunctionTemplate::New(Version));
+  if (i::FLAG_prof) {
+    global_template->Set(String::New("enableProfiler"),
+                         FunctionTemplate::New(EnableProfiler));
+    global_template->Set(String::New("disableProfiler"),
+                         FunctionTemplate::New(DisableProfiler));
+  }
 
   // Bind the handlers for external arrays.
   global_template->Set(String::New("Int8Array"),
                        FunctionTemplate::New(Int8Array));
   global_template->Set(String::New("Uint8Array"),
                        FunctionTemplate::New(Uint8Array));
   global_template->Set(String::New("Int16Array"),
                        FunctionTemplate::New(Int16Array));
   global_template->Set(String::New("Uint16Array"),
                        FunctionTemplate::New(Uint16Array));
@@ skipping 629 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif