Initial import.

5 files changed, 1577 insertions, 0 deletions

diff --git a/chromium/v8/samples/count-hosts.js b/chromium/v8/samples/count-hosts.js
new file mode 100644
index 00000000000..bea6553d27b
--- /dev/null
+++ b/chromium/v8/samples/count-hosts.js
@@ -0,0 +1,42 @@
+// Copyright 2008 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.
+
+function Initialize() { }
+
+function Process(request) {
+  if (options.verbose) {
+    log("Processing " + request.host + request.path +
+        " from " + request.referrer + "@" + request.userAgent);
+  }
+  if (!output[request.host]) {
+    output[request.host] = 1;
+  } else {
+    output[request.host]++
+  }
+}
+
+Initialize();
diff --git a/chromium/v8/samples/lineprocessor.cc b/chromium/v8/samples/lineprocessor.cc
new file mode 100644
index 00000000000..42048202fdd
--- /dev/null
+++ b/chromium/v8/samples/lineprocessor.cc
@@ -0,0 +1,450 @@
+// Copyright 2012 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 <v8.h>
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+#include <v8-debug.h>
+#endif  // ENABLE_DEBUGGER_SUPPORT
+
+#include <fcntl.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+/**
+ * This sample program should demonstrate certain aspects of debugging
+ * standalone V8-based application.
+ *
+ * The program reads input stream, processes it line by line and print
+ * the result to output. The actual processing is done by custom JavaScript
+ * script. The script is specified with command line parameters.
+ *
+ * The main cycle of the program will sequentially read lines from standard
+ * input, process them and print to standard output until input closes.
+ * There are 2 possible configuration in regard to main cycle.
+ *
+ * 1. The main cycle is on C++ side. Program should be run with
+ * --main-cycle-in-cpp option. Script must declare a function named
+ * "ProcessLine". The main cycle in C++ reads lines and calls this function
+ * for processing every time. This is a sample script:
+
+function ProcessLine(input_line) {
+  return ">>>" + input_line + "<<<";
+}
+
+ *
+ * 2. The main cycle is in JavaScript. Program should be run with
+ * --main-cycle-in-js option. Script gets run one time at all and gets
+ * API of 2 global functions: "read_line" and "print". It should read input
+ * and print converted lines to output itself. This a sample script:
+
+while (true) {
+  var line = read_line();
+  if (!line) {
+    break;
+  }
+  var res = line + " | " + line;
+  print(res);
+}
+
+ *
+ * When run with "-p" argument, the program starts V8 Debugger Agent and
+ * allows remote debugger to attach and debug JavaScript code.
+ *
+ * Interesting aspects:
+ * 1. Wait for remote debugger to attach
+ * Normally the program compiles custom script and immediately runs it.
+ * If programmer needs to debug script from the very beginning, he should
+ * run this sample program with "--wait-for-connection" command line parameter.
+ * This way V8 will suspend on the first statement and wait for
+ * debugger to attach.
+ *
+ * 2. Unresponsive V8
+ * V8 Debugger Agent holds a connection with remote debugger, but it does
+ * respond only when V8 is running some script. In particular, when this program
+ * is waiting for input, all requests from debugger get deferred until V8
+ * is called again. See how "--callback" command-line parameter in this sample
+ * fixes this issue.
+ */
+
+enum MainCycleType {
+  CycleInCpp,
+  CycleInJs
+};
+
+const char* ToCString(const v8::String::Utf8Value& value);
+void ReportException(v8::Isolate* isolate, v8::TryCatch* handler);
+v8::Handle<v8::String> ReadFile(const char* name);
+v8::Handle<v8::String> ReadLine();
+
+void Print(const v8::FunctionCallbackInfo<v8::Value>& args);
+void ReadLine(const v8::FunctionCallbackInfo<v8::Value>& args);
+bool RunCppCycle(v8::Handle<v8::Script> script,
+                 v8::Local<v8::Context> context,
+                 bool report_exceptions);
+
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+v8::Persistent<v8::Context> debug_message_context;
+
+void DispatchDebugMessages() {
+  // We are in some random thread. We should already have v8::Locker acquired
+  // (we requested this when registered this callback). We was called
+  // because new debug messages arrived; they may have already been processed,
+  // but we shouldn't worry about this.
+  //
+  // All we have to do is to set context and call ProcessDebugMessages.
+  //
+  // We should decide which V8 context to use here. This is important for
+  // "evaluate" command, because it must be executed some context.
+  // In our sample we have only one context, so there is nothing really to
+  // think about.
+  v8::Isolate* isolate = v8::Isolate::GetCurrent();
+  v8::HandleScope handle_scope(isolate);
+  v8::Local<v8::Context> context =
+      v8::Local<v8::Context>::New(isolate, debug_message_context);
+  v8::Context::Scope scope(context);
+
+  v8::Debug::ProcessDebugMessages();
+}
+#endif  // ENABLE_DEBUGGER_SUPPORT
+
+
+int RunMain(int argc, char* argv[]) {
+  v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
+  v8::Isolate* isolate = v8::Isolate::GetCurrent();
+  v8::HandleScope handle_scope(isolate);
+
+  v8::Handle<v8::String> script_source;
+  v8::Handle<v8::Value> script_name;
+  int script_param_counter = 0;
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+  int port_number = -1;
+  bool wait_for_connection = false;
+  bool support_callback = false;
+#endif  // ENABLE_DEBUGGER_SUPPORT
+
+  MainCycleType cycle_type = CycleInCpp;
+
+  for (int i = 1; i < argc; i++) {
+    const char* str = argv[i];
+    if (strcmp(str, "-f") == 0) {
+      // Ignore any -f flags for compatibility with the other stand-
+      // alone JavaScript engines.
+      continue;
+    } else if (strcmp(str, "--main-cycle-in-cpp") == 0) {
+      cycle_type = CycleInCpp;
+    } else if (strcmp(str, "--main-cycle-in-js") == 0) {
+      cycle_type = CycleInJs;
+#ifdef ENABLE_DEBUGGER_SUPPORT
+    } else if (strcmp(str, "--callback") == 0) {
+      support_callback = true;
+    } else if (strcmp(str, "--wait-for-connection") == 0) {
+      wait_for_connection = true;
+    } else if (strcmp(str, "-p") == 0 && i + 1 < argc) {
+      port_number = atoi(argv[i + 1]);  // NOLINT
+      i++;
+#endif  // ENABLE_DEBUGGER_SUPPORT
+    } else if (strncmp(str, "--", 2) == 0) {
+      printf("Warning: unknown flag %s.\nTry --help for options\n", str);
+    } else if (strcmp(str, "-e") == 0 && i + 1 < argc) {
+      script_source = v8::String::New(argv[i + 1]);
+      script_name = v8::String::New("unnamed");
+      i++;
+      script_param_counter++;
+    } else {
+      // Use argument as a name of file to load.
+      script_source = ReadFile(str);
+      script_name = v8::String::New(str);
+      if (script_source.IsEmpty()) {
+        printf("Error reading '%s'\n", str);
+        return 1;
+      }
+      script_param_counter++;
+    }
+  }
+
+  if (script_param_counter == 0) {
+    printf("Script is not specified\n");
+    return 1;
+  }
+  if (script_param_counter != 1) {
+    printf("Only one script may be specified\n");
+    return 1;
+  }
+
+  // Create a template for the global object.
+  v8::Handle<v8::ObjectTemplate> global = v8::ObjectTemplate::New();
+
+  // Bind the global 'print' function to the C++ Print callback.
+  global->Set(v8::String::New("print"), v8::FunctionTemplate::New(Print));
+
+  if (cycle_type == CycleInJs) {
+    // Bind the global 'read_line' function to the C++ Print callback.
+    global->Set(v8::String::New("read_line"),
+                v8::FunctionTemplate::New(ReadLine));
+  }
+
+  // Create a new execution environment containing the built-in
+  // functions
+  v8::Handle<v8::Context> context = v8::Context::New(isolate, NULL, global);
+  // Enter the newly created execution environment.
+  v8::Context::Scope context_scope(context);
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+  debug_message_context.Reset(isolate, context);
+
+  v8::Locker locker(isolate);
+
+  if (support_callback) {
+    v8::Debug::SetDebugMessageDispatchHandler(DispatchDebugMessages, true);
+  }
+
+  if (port_number != -1) {
+    v8::Debug::EnableAgent("lineprocessor", port_number, wait_for_connection);
+  }
+#endif  // ENABLE_DEBUGGER_SUPPORT
+
+  bool report_exceptions = true;
+
+  v8::Handle<v8::Script> script;
+  {
+    // Compile script in try/catch context.
+    v8::TryCatch try_catch;
+    script = v8::Script::Compile(script_source, script_name);
+    if (script.IsEmpty()) {
+      // Print errors that happened during compilation.
+      if (report_exceptions)
+        ReportException(isolate, &try_catch);
+      return 1;
+    }
+  }
+
+  {
+    v8::TryCatch try_catch;
+
+    script->Run();
+    if (try_catch.HasCaught()) {
+      if (report_exceptions)
+        ReportException(isolate, &try_catch);
+      return 1;
+    }
+  }
+
+  if (cycle_type == CycleInCpp) {
+    bool res = RunCppCycle(script,
+                           v8::Context::GetCurrent(),
+                           report_exceptions);
+    return !res;
+  } else {
+    // All is already done.
+  }
+  return 0;
+}
+
+
+bool RunCppCycle(v8::Handle<v8::Script> script,
+                 v8::Local<v8::Context> context,
+                 bool report_exceptions) {
+  v8::Isolate* isolate = context->GetIsolate();
+#ifdef ENABLE_DEBUGGER_SUPPORT
+  v8::Locker lock(isolate);
+#endif  // ENABLE_DEBUGGER_SUPPORT
+
+  v8::Handle<v8::String> fun_name = v8::String::New("ProcessLine");
+  v8::Handle<v8::Value> process_val = context->Global()->Get(fun_name);
+
+  // If there is no Process function, or if it is not a function,
+  // bail out
+  if (!process_val->IsFunction()) {
+    printf("Error: Script does not declare 'ProcessLine' global function.\n");
+    return 1;
+  }
+
+  // It is a function; cast it to a Function
+  v8::Handle<v8::Function> process_fun =
+      v8::Handle<v8::Function>::Cast(process_val);
+
+
+  while (!feof(stdin)) {
+    v8::HandleScope handle_scope(isolate);
+
+    v8::Handle<v8::String> input_line = ReadLine();
+    if (input_line == v8::Undefined()) {
+      continue;
+    }
+
+    const int argc = 1;
+    v8::Handle<v8::Value> argv[argc] = { input_line };
+
+    v8::Handle<v8::Value> result;
+    {
+      v8::TryCatch try_catch;
+      result = process_fun->Call(v8::Context::GetCurrent()->Global(),
+                                 argc, argv);
+      if (try_catch.HasCaught()) {
+        if (report_exceptions)
+          ReportException(isolate, &try_catch);
+        return false;
+      }
+    }
+    v8::String::Utf8Value str(result);
+    const char* cstr = ToCString(str);
+    printf("%s\n", cstr);
+  }
+
+  return true;
+}
+
+
+int main(int argc, char* argv[]) {
+  v8::V8::InitializeICU();
+  int result = RunMain(argc, argv);
+  v8::V8::Dispose();
+  return result;
+}
+
+
+// Extracts a C string from a V8 Utf8Value.
+const char* ToCString(const v8::String::Utf8Value& value) {
+  return *value ? *value : "<string conversion failed>";
+}
+
+
+// Reads a file into a v8 string.
+v8::Handle<v8::String> ReadFile(const char* name) {
+  FILE* file = fopen(name, "rb");
+  if (file == NULL) return v8::Handle<v8::String>();
+
+  fseek(file, 0, SEEK_END);
+  int size = ftell(file);
+  rewind(file);
+
+  char* chars = new char[size + 1];
+  chars[size] = '\0';
+  for (int i = 0; i < size;) {
+    int read = static_cast<int>(fread(&chars[i], 1, size - i, file));
+    i += read;
+  }
+  fclose(file);
+  v8::Handle<v8::String> result = v8::String::New(chars, size);
+  delete[] chars;
+  return result;
+}
+
+
+void ReportException(v8::Isolate* isolate, v8::TryCatch* try_catch) {
+  v8::HandleScope handle_scope(isolate);
+  v8::String::Utf8Value exception(try_catch->Exception());
+  const char* exception_string = ToCString(exception);
+  v8::Handle<v8::Message> message = try_catch->Message();
+  if (message.IsEmpty()) {
+    // V8 didn't provide any extra information about this error; just
+    // print the exception.
+    printf("%s\n", exception_string);
+  } else {
+    // Print (filename):(line number): (message).
+    v8::String::Utf8Value filename(message->GetScriptResourceName());
+    const char* filename_string = ToCString(filename);
+    int linenum = message->GetLineNumber();
+    printf("%s:%i: %s\n", filename_string, linenum, exception_string);
+    // Print line of source code.
+    v8::String::Utf8Value sourceline(message->GetSourceLine());
+    const char* sourceline_string = ToCString(sourceline);
+    printf("%s\n", sourceline_string);
+    // Print wavy underline (GetUnderline is deprecated).
+    int start = message->GetStartColumn();
+    for (int i = 0; i < start; i++) {
+      printf(" ");
+    }
+    int end = message->GetEndColumn();
+    for (int i = start; i < end; i++) {
+      printf("^");
+    }
+    printf("\n");
+  }
+}
+
+
+// The callback that is invoked by v8 whenever the JavaScript 'print'
+// function is called.  Prints its arguments on stdout separated by
+// spaces and ending with a newline.
+void Print(const v8::FunctionCallbackInfo<v8::Value>& args) {
+  bool first = true;
+  for (int i = 0; i < args.Length(); i++) {
+    v8::HandleScope handle_scope(args.GetIsolate());
+    if (first) {
+      first = false;
+    } else {
+      printf(" ");
+    }
+    v8::String::Utf8Value str(args[i]);
+    const char* cstr = ToCString(str);
+    printf("%s", cstr);
+  }
+  printf("\n");
+  fflush(stdout);
+}
+
+
+// The callback that is invoked by v8 whenever the JavaScript 'read_line'
+// function is called. Reads a string from standard input and returns.
+void ReadLine(const v8::FunctionCallbackInfo<v8::Value>& args) {
+  if (args.Length() > 0) {
+    v8::ThrowException(v8::String::New("Unexpected arguments"));
+    return;
+  }
+  args.GetReturnValue().Set(ReadLine());
+}
+
+
+v8::Handle<v8::String> ReadLine() {
+  const int kBufferSize = 1024 + 1;
+  char buffer[kBufferSize];
+
+  char* res;
+  {
+#ifdef ENABLE_DEBUGGER_SUPPORT
+    v8::Unlocker unlocker(v8::Isolate::GetCurrent());
+#endif  // ENABLE_DEBUGGER_SUPPORT
+    res = fgets(buffer, kBufferSize, stdin);
+  }
+  if (res == NULL) {
+    v8::Handle<v8::Primitive> t = v8::Undefined();
+    return v8::Handle<v8::String>::Cast(t);
+  }
+  // Remove newline char
+  for (char* pos = buffer; *pos != '\0'; pos++) {
+    if (*pos == '\n') {
+      *pos = '\0';
+      break;
+    }
+  }
+  return v8::String::New(buffer);
+}
diff --git a/chromium/v8/samples/process.cc b/chromium/v8/samples/process.cc
new file mode 100644
index 00000000000..844aee3d45f
--- /dev/null
+++ b/chromium/v8/samples/process.cc
@@ -0,0 +1,654 @@
+// Copyright 2012 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 <v8.h>
+
+#include <string>
+#include <map>
+
+#ifdef COMPRESS_STARTUP_DATA_BZ2
+#error Using compressed startup data is not supported for this sample
+#endif
+
+using namespace std;
+using namespace v8;
+
+// These interfaces represent an existing request processing interface.
+// The idea is to imagine a real application that uses these interfaces
+// and then add scripting capabilities that allow you to interact with
+// the objects through JavaScript.
+
+/**
+ * A simplified http request.
+ */
+class HttpRequest {
+ public:
+  virtual ~HttpRequest() { }
+  virtual const string& Path() = 0;
+  virtual const string& Referrer() = 0;
+  virtual const string& Host() = 0;
+  virtual const string& UserAgent() = 0;
+};
+
+
+/**
+ * The abstract superclass of http request processors.
+ */
+class HttpRequestProcessor {
+ public:
+  virtual ~HttpRequestProcessor() { }
+
+  // Initialize this processor.  The map contains options that control
+  // how requests should be processed.
+  virtual bool Initialize(map<string, string>* options,
+                          map<string, string>* output) = 0;
+
+  // Process a single request.
+  virtual bool Process(HttpRequest* req) = 0;
+
+  static void Log(const char* event);
+};
+
+
+/**
+ * An http request processor that is scriptable using JavaScript.
+ */
+class JsHttpRequestProcessor : public HttpRequestProcessor {
+ public:
+  // Creates a new processor that processes requests by invoking the
+  // Process function of the JavaScript script given as an argument.
+  JsHttpRequestProcessor(Isolate* isolate, Handle<String> script)
+      : isolate_(isolate), script_(script) { }
+  virtual ~JsHttpRequestProcessor();
+
+  virtual bool Initialize(map<string, string>* opts,
+                          map<string, string>* output);
+  virtual bool Process(HttpRequest* req);
+
+ private:
+  // Execute the script associated with this processor and extract the
+  // Process function.  Returns true if this succeeded, otherwise false.
+  bool ExecuteScript(Handle<String> script);
+
+  // Wrap the options and output map in a JavaScript objects and
+  // install it in the global namespace as 'options' and 'output'.
+  bool InstallMaps(map<string, string>* opts, map<string, string>* output);
+
+  // Constructs the template that describes the JavaScript wrapper
+  // type for requests.
+  static Handle<ObjectTemplate> MakeRequestTemplate(Isolate* isolate);
+  static Handle<ObjectTemplate> MakeMapTemplate(Isolate* isolate);
+
+  // Callbacks that access the individual fields of request objects.
+  static void GetPath(Local<String> name,
+                      const PropertyCallbackInfo<Value>& info);
+  static void GetReferrer(Local<String> name,
+                          const PropertyCallbackInfo<Value>& info);
+  static void GetHost(Local<String> name,
+                      const PropertyCallbackInfo<Value>& info);
+  static void GetUserAgent(Local<String> name,
+                           const PropertyCallbackInfo<Value>& info);
+
+  // Callbacks that access maps
+  static void MapGet(Local<String> name,
+                     const PropertyCallbackInfo<Value>& info);
+  static void MapSet(Local<String> name,
+                     Local<Value> value,
+                     const PropertyCallbackInfo<Value>& info);
+
+  // Utility methods for wrapping C++ objects as JavaScript objects,
+  // and going back again.
+  Handle<Object> WrapMap(map<string, string>* obj);
+  static map<string, string>* UnwrapMap(Handle<Object> obj);
+  Handle<Object> WrapRequest(HttpRequest* obj);
+  static HttpRequest* UnwrapRequest(Handle<Object> obj);
+
+  Isolate* GetIsolate() { return isolate_; }
+
+  Isolate* isolate_;
+  Handle<String> script_;
+  Persistent<Context> context_;
+  Persistent<Function> process_;
+  static Persistent<ObjectTemplate> request_template_;
+  static Persistent<ObjectTemplate> map_template_;
+};
+
+
+// -------------------------
+// --- P r o c e s s o r ---
+// -------------------------
+
+
+static void LogCallback(const v8::FunctionCallbackInfo<v8::Value>& args) {
+  if (args.Length() < 1) return;
+  HandleScope scope(args.GetIsolate());
+  Handle<Value> arg = args[0];
+  String::Utf8Value value(arg);
+  HttpRequestProcessor::Log(*value);
+}
+
+
+// Execute the script and fetch the Process method.
+bool JsHttpRequestProcessor::Initialize(map<string, string>* opts,
+                                        map<string, string>* output) {
+  // Create a handle scope to hold the temporary references.
+  HandleScope handle_scope(GetIsolate());
+
+  // Create a template for the global object where we set the
+  // built-in global functions.
+  Handle<ObjectTemplate> global = ObjectTemplate::New();
+  global->Set(String::New("log"), FunctionTemplate::New(LogCallback));
+
+  // Each processor gets its own context so different processors don't
+  // affect each other. Context::New returns a persistent handle which
+  // is what we need for the reference to remain after we return from
+  // this method. That persistent handle has to be disposed in the
+  // destructor.
+  v8::Handle<v8::Context> context = Context::New(GetIsolate(), NULL, global);
+  context_.Reset(GetIsolate(), context);
+
+  // Enter the new context so all the following operations take place
+  // within it.
+  Context::Scope context_scope(context);
+
+  // Make the options mapping available within the context
+  if (!InstallMaps(opts, output))
+    return false;
+
+  // Compile and run the script
+  if (!ExecuteScript(script_))
+    return false;
+
+  // The script compiled and ran correctly.  Now we fetch out the
+  // Process function from the global object.
+  Handle<String> process_name = String::New("Process");
+  Handle<Value> process_val = context->Global()->Get(process_name);
+
+  // If there is no Process function, or if it is not a function,
+  // bail out
+  if (!process_val->IsFunction()) return false;
+
+  // It is a function; cast it to a Function
+  Handle<Function> process_fun = Handle<Function>::Cast(process_val);
+
+  // Store the function in a Persistent handle, since we also want
+  // that to remain after this call returns
+  process_.Reset(GetIsolate(), process_fun);
+
+  // All done; all went well
+  return true;
+}
+
+
+bool JsHttpRequestProcessor::ExecuteScript(Handle<String> script) {
+  HandleScope handle_scope(GetIsolate());
+
+  // We're just about to compile the script; set up an error handler to
+  // catch any exceptions the script might throw.
+  TryCatch try_catch;
+
+  // Compile the script and check for errors.
+  Handle<Script> compiled_script = Script::Compile(script);
+  if (compiled_script.IsEmpty()) {
+    String::Utf8Value error(try_catch.Exception());
+    Log(*error);
+    // The script failed to compile; bail out.
+    return false;
+  }
+
+  // Run the script!
+  Handle<Value> result = compiled_script->Run();
+  if (result.IsEmpty()) {
+    // The TryCatch above is still in effect and will have caught the error.
+    String::Utf8Value error(try_catch.Exception());
+    Log(*error);
+    // Running the script failed; bail out.
+    return false;
+  }
+  return true;
+}
+
+
+bool JsHttpRequestProcessor::InstallMaps(map<string, string>* opts,
+                                         map<string, string>* output) {
+  HandleScope handle_scope(GetIsolate());
+
+  // Wrap the map object in a JavaScript wrapper
+  Handle<Object> opts_obj = WrapMap(opts);
+
+  v8::Local<v8::Context> context =
+      v8::Local<v8::Context>::New(GetIsolate(), context_);
+
+  // Set the options object as a property on the global object.
+  context->Global()->Set(String::New("options"), opts_obj);
+
+  Handle<Object> output_obj = WrapMap(output);
+  context->Global()->Set(String::New("output"), output_obj);
+
+  return true;
+}
+
+
+bool JsHttpRequestProcessor::Process(HttpRequest* request) {
+  // Create a handle scope to keep the temporary object references.
+  HandleScope handle_scope(GetIsolate());
+
+  v8::Local<v8::Context> context =
+      v8::Local<v8::Context>::New(GetIsolate(), context_);
+
+  // Enter this processor's context so all the remaining operations
+  // take place there
+  Context::Scope context_scope(context);
+
+  // Wrap the C++ request object in a JavaScript wrapper
+  Handle<Object> request_obj = WrapRequest(request);
+
+  // Set up an exception handler before calling the Process function
+  TryCatch try_catch;
+
+  // Invoke the process function, giving the global object as 'this'
+  // and one argument, the request.
+  const int argc = 1;
+  Handle<Value> argv[argc] = { request_obj };
+  v8::Local<v8::Function> process =
+      v8::Local<v8::Function>::New(GetIsolate(), process_);
+  Handle<Value> result = process->Call(context->Global(), argc, argv);
+  if (result.IsEmpty()) {
+    String::Utf8Value error(try_catch.Exception());
+    Log(*error);
+    return false;
+  } else {
+    return true;
+  }
+}
+
+
+JsHttpRequestProcessor::~JsHttpRequestProcessor() {
+  // Dispose the persistent handles.  When noone else has any
+  // references to the objects stored in the handles they will be
+  // automatically reclaimed.
+  Isolate* isolate = GetIsolate();
+  context_.Dispose(isolate);
+  process_.Dispose(isolate);
+}
+
+
+Persistent<ObjectTemplate> JsHttpRequestProcessor::request_template_;
+Persistent<ObjectTemplate> JsHttpRequestProcessor::map_template_;
+
+
+// -----------------------------------
+// --- A c c e s s i n g   M a p s ---
+// -----------------------------------
+
+// Utility function that wraps a C++ http request object in a
+// JavaScript object.
+Handle<Object> JsHttpRequestProcessor::WrapMap(map<string, string>* obj) {
+  // Handle scope for temporary handles.
+  HandleScope handle_scope(GetIsolate());
+
+  // Fetch the template for creating JavaScript map wrappers.
+  // It only has to be created once, which we do on demand.
+  if (map_template_.IsEmpty()) {
+    Handle<ObjectTemplate> raw_template = MakeMapTemplate(GetIsolate());
+    map_template_.Reset(GetIsolate(), raw_template);
+  }
+  Handle<ObjectTemplate> templ =
+      Local<ObjectTemplate>::New(GetIsolate(), map_template_);
+
+  // Create an empty map wrapper.
+  Handle<Object> result = templ->NewInstance();
+
+  // Wrap the raw C++ pointer in an External so it can be referenced
+  // from within JavaScript.
+  Handle<External> map_ptr = External::New(obj);
+
+  // Store the map pointer in the JavaScript wrapper.
+  result->SetInternalField(0, map_ptr);
+
+  // Return the result through the current handle scope.  Since each
+  // of these handles will go away when the handle scope is deleted
+  // we need to call Close to let one, the result, escape into the
+  // outer handle scope.
+  return handle_scope.Close(result);
+}
+
+
+// Utility function that extracts the C++ map pointer from a wrapper
+// object.
+map<string, string>* JsHttpRequestProcessor::UnwrapMap(Handle<Object> obj) {
+  Handle<External> field = Handle<External>::Cast(obj->GetInternalField(0));
+  void* ptr = field->Value();
+  return static_cast<map<string, string>*>(ptr);
+}
+
+
+// Convert a JavaScript string to a std::string.  To not bother too
+// much with string encodings we just use ascii.
+string ObjectToString(Local<Value> value) {
+  String::Utf8Value utf8_value(value);
+  return string(*utf8_value);
+}
+
+
+void JsHttpRequestProcessor::MapGet(Local<String> name,
+                                    const PropertyCallbackInfo<Value>& info) {
+  // Fetch the map wrapped by this object.
+  map<string, string>* obj = UnwrapMap(info.Holder());
+
+  // Convert the JavaScript string to a std::string.
+  string key = ObjectToString(name);
+
+  // Look up the value if it exists using the standard STL ideom.
+  map<string, string>::iterator iter = obj->find(key);
+
+  // If the key is not present return an empty handle as signal
+  if (iter == obj->end()) return;
+
+  // Otherwise fetch the value and wrap it in a JavaScript string
+  const string& value = (*iter).second;
+  info.GetReturnValue().Set(
+      String::New(value.c_str(), static_cast<int>(value.length())));
+}
+
+
+void JsHttpRequestProcessor::MapSet(Local<String> name,
+                                    Local<Value> value_obj,
+                                    const PropertyCallbackInfo<Value>& info) {
+  // Fetch the map wrapped by this object.
+  map<string, string>* obj = UnwrapMap(info.Holder());
+
+  // Convert the key and value to std::strings.
+  string key = ObjectToString(name);
+  string value = ObjectToString(value_obj);
+
+  // Update the map.
+  (*obj)[key] = value;
+
+  // Return the value; any non-empty handle will work.
+  info.GetReturnValue().Set(value_obj);
+}
+
+
+Handle<ObjectTemplate> JsHttpRequestProcessor::MakeMapTemplate(
+    Isolate* isolate) {
+  HandleScope handle_scope(isolate);
+
+  Handle<ObjectTemplate> result = ObjectTemplate::New();
+  result->SetInternalFieldCount(1);
+  result->SetNamedPropertyHandler(MapGet, MapSet);
+
+  // Again, return the result through the current handle scope.
+  return handle_scope.Close(result);
+}
+
+
+// -------------------------------------------
+// --- A c c e s s i n g   R e q u e s t s ---
+// -------------------------------------------
+
+/**
+ * Utility function that wraps a C++ http request object in a
+ * JavaScript object.
+ */
+Handle<Object> JsHttpRequestProcessor::WrapRequest(HttpRequest* request) {
+  // Handle scope for temporary handles.
+  HandleScope handle_scope(GetIsolate());
+
+  // Fetch the template for creating JavaScript http request wrappers.
+  // It only has to be created once, which we do on demand.
+  if (request_template_.IsEmpty()) {
+    Handle<ObjectTemplate> raw_template = MakeRequestTemplate(GetIsolate());
+    request_template_.Reset(GetIsolate(), raw_template);
+  }
+  Handle<ObjectTemplate> templ =
+      Local<ObjectTemplate>::New(GetIsolate(), request_template_);
+
+  // Create an empty http request wrapper.
+  Handle<Object> result = templ->NewInstance();
+
+  // Wrap the raw C++ pointer in an External so it can be referenced
+  // from within JavaScript.
+  Handle<External> request_ptr = External::New(request);
+
+  // Store the request pointer in the JavaScript wrapper.
+  result->SetInternalField(0, request_ptr);
+
+  // Return the result through the current handle scope.  Since each
+  // of these handles will go away when the handle scope is deleted
+  // we need to call Close to let one, the result, escape into the
+  // outer handle scope.
+  return handle_scope.Close(result);
+}
+
+
+/**
+ * Utility function that extracts the C++ http request object from a
+ * wrapper object.
+ */
+HttpRequest* JsHttpRequestProcessor::UnwrapRequest(Handle<Object> obj) {
+  Handle<External> field = Handle<External>::Cast(obj->GetInternalField(0));
+  void* ptr = field->Value();
+  return static_cast<HttpRequest*>(ptr);
+}
+
+
+void JsHttpRequestProcessor::GetPath(Local<String> name,
+                                     const PropertyCallbackInfo<Value>& info) {
+  // Extract the C++ request object from the JavaScript wrapper.
+  HttpRequest* request = UnwrapRequest(info.Holder());
+
+  // Fetch the path.
+  const string& path = request->Path();
+
+  // Wrap the result in a JavaScript string and return it.
+  info.GetReturnValue().Set(
+      String::New(path.c_str(), static_cast<int>(path.length())));
+}
+
+
+void JsHttpRequestProcessor::GetReferrer(
+    Local<String> name,
+    const PropertyCallbackInfo<Value>& info) {
+  HttpRequest* request = UnwrapRequest(info.Holder());
+  const string& path = request->Referrer();
+  info.GetReturnValue().Set(
+      String::New(path.c_str(), static_cast<int>(path.length())));
+}
+
+
+void JsHttpRequestProcessor::GetHost(Local<String> name,
+                                     const PropertyCallbackInfo<Value>& info) {
+  HttpRequest* request = UnwrapRequest(info.Holder());
+  const string& path = request->Host();
+  info.GetReturnValue().Set(
+      String::New(path.c_str(), static_cast<int>(path.length())));
+}
+
+
+void JsHttpRequestProcessor::GetUserAgent(
+    Local<String> name,
+    const PropertyCallbackInfo<Value>& info) {
+  HttpRequest* request = UnwrapRequest(info.Holder());
+  const string& path = request->UserAgent();
+  info.GetReturnValue().Set(
+      String::New(path.c_str(), static_cast<int>(path.length())));
+}
+
+
+Handle<ObjectTemplate> JsHttpRequestProcessor::MakeRequestTemplate(
+    Isolate* isolate) {
+  HandleScope handle_scope(isolate);
+
+  Handle<ObjectTemplate> result = ObjectTemplate::New();
+  result->SetInternalFieldCount(1);
+
+  // Add accessors for each of the fields of the request.
+  result->SetAccessor(String::NewSymbol("path"), GetPath);
+  result->SetAccessor(String::NewSymbol("referrer"), GetReferrer);
+  result->SetAccessor(String::NewSymbol("host"), GetHost);
+  result->SetAccessor(String::NewSymbol("userAgent"), GetUserAgent);
+
+  // Again, return the result through the current handle scope.
+  return handle_scope.Close(result);
+}
+
+
+// --- Test ---
+
+
+void HttpRequestProcessor::Log(const char* event) {
+  printf("Logged: %s\n", event);
+}
+
+
+/**
+ * A simplified http request.
+ */
+class StringHttpRequest : public HttpRequest {
+ public:
+  StringHttpRequest(const string& path,
+                    const string& referrer,
+                    const string& host,
+                    const string& user_agent);
+  virtual const string& Path() { return path_; }
+  virtual const string& Referrer() { return referrer_; }
+  virtual const string& Host() { return host_; }
+  virtual const string& UserAgent() { return user_agent_; }
+ private:
+  string path_;
+  string referrer_;
+  string host_;
+  string user_agent_;
+};
+
+
+StringHttpRequest::StringHttpRequest(const string& path,
+                                     const string& referrer,
+                                     const string& host,
+                                     const string& user_agent)
+    : path_(path),
+      referrer_(referrer),
+      host_(host),
+      user_agent_(user_agent) { }
+
+
+void ParseOptions(int argc,
+                  char* argv[],
+                  map<string, string>& options,
+                  string* file) {
+  for (int i = 1; i < argc; i++) {
+    string arg = argv[i];
+    size_t index = arg.find('=', 0);
+    if (index == string::npos) {
+      *file = arg;
+    } else {
+      string key = arg.substr(0, index);
+      string value = arg.substr(index+1);
+      options[key] = value;
+    }
+  }
+}
+
+
+// Reads a file into a v8 string.
+Handle<String> ReadFile(const string& name) {
+  FILE* file = fopen(name.c_str(), "rb");
+  if (file == NULL) return Handle<String>();
+
+  fseek(file, 0, SEEK_END);
+  int size = ftell(file);
+  rewind(file);
+
+  char* chars = new char[size + 1];
+  chars[size] = '\0';
+  for (int i = 0; i < size;) {
+    int read = static_cast<int>(fread(&chars[i], 1, size - i, file));
+    i += read;
+  }
+  fclose(file);
+  Handle<String> result = String::New(chars, size);
+  delete[] chars;
+  return result;
+}
+
+
+const int kSampleSize = 6;
+StringHttpRequest kSampleRequests[kSampleSize] = {
+  StringHttpRequest("/process.cc", "localhost", "google.com", "firefox"),
+  StringHttpRequest("/", "localhost", "google.net", "firefox"),
+  StringHttpRequest("/", "localhost", "google.org", "safari"),
+  StringHttpRequest("/", "localhost", "yahoo.com", "ie"),
+  StringHttpRequest("/", "localhost", "yahoo.com", "safari"),
+  StringHttpRequest("/", "localhost", "yahoo.com", "firefox")
+};
+
+
+bool ProcessEntries(HttpRequestProcessor* processor, int count,
+                    StringHttpRequest* reqs) {
+  for (int i = 0; i < count; i++) {
+    if (!processor->Process(&reqs[i]))
+      return false;
+  }
+  return true;
+}
+
+
+void PrintMap(map<string, string>* m) {
+  for (map<string, string>::iterator i = m->begin(); i != m->end(); i++) {
+    pair<string, string> entry = *i;
+    printf("%s: %s\n", entry.first.c_str(), entry.second.c_str());
+  }
+}
+
+
+int main(int argc, char* argv[]) {
+  v8::V8::InitializeICU();
+  map<string, string> options;
+  string file;
+  ParseOptions(argc, argv, options, &file);
+  if (file.empty()) {
+    fprintf(stderr, "No script was specified.\n");
+    return 1;
+  }
+  Isolate* isolate = Isolate::GetCurrent();
+  HandleScope scope(isolate);
+  Handle<String> source = ReadFile(file);
+  if (source.IsEmpty()) {
+    fprintf(stderr, "Error reading '%s'.\n", file.c_str());
+    return 1;
+  }
+  JsHttpRequestProcessor processor(isolate, source);
+  map<string, string> output;
+  if (!processor.Initialize(&options, &output)) {
+    fprintf(stderr, "Error initializing processor.\n");
+    return 1;
+  }
+  if (!ProcessEntries(&processor, kSampleSize, kSampleRequests))
+    return 1;
+  PrintMap(&output);
+}
diff --git a/chromium/v8/samples/samples.gyp b/chromium/v8/samples/samples.gyp
new file mode 100644
index 00000000000..be7b9ea696c
--- /dev/null
+++ b/chromium/v8/samples/samples.gyp
@@ -0,0 +1,76 @@
+# Copyright 2012 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.
+
+{
+  'variables': {
+    'v8_code': 1,
+    'v8_enable_i18n_support%': 0,
+  },
+  'includes': ['../build/toolchain.gypi', '../build/features.gypi'],
+  'target_defaults': {
+    'type': 'executable',
+    'dependencies': [
+      '../tools/gyp/v8.gyp:v8',
+    ],
+    'include_dirs': [
+      '../include',
+    ],
+    'conditions': [
+      ['v8_enable_i18n_support==1', {
+        'dependencies': [
+          '<(DEPTH)/third_party/icu/icu.gyp:icui18n',
+          '<(DEPTH)/third_party/icu/icu.gyp:icuuc',
+        ],
+      }],
+      ['OS=="win" and v8_enable_i18n_support==1', {
+        'dependencies': [
+          '<(DEPTH)/third_party/icu/icu.gyp:icudata',
+        ],
+      }],
+    ],
+  },
+  'targets': [
+    {
+      'target_name': 'shell',
+      'sources': [
+        'shell.cc',
+      ],
+    },
+    {
+      'target_name': 'process',
+      'sources': [
+        'process.cc',
+      ],
+    },
+    {
+      'target_name': 'lineprocessor',
+      'sources': [
+        'lineprocessor.cc',
+      ],
+    }
+  ],
+}
diff --git a/chromium/v8/samples/shell.cc b/chromium/v8/samples/shell.cc
new file mode 100644
index 00000000000..710547c3419
--- /dev/null
+++ b/chromium/v8/samples/shell.cc
@@ -0,0 +1,355 @@
+// Copyright 2012 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 <v8.h>
+#include <assert.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifdef COMPRESS_STARTUP_DATA_BZ2
+#error Using compressed startup data is not supported for this sample
+#endif
+
+/**
+ * This sample program shows how to implement a simple javascript shell
+ * based on V8.  This includes initializing V8 with command line options,
+ * creating global functions, compiling and executing strings.
+ *
+ * For a more sophisticated shell, consider using the debug shell D8.
+ */
+
+
+v8::Handle<v8::Context> CreateShellContext(v8::Isolate* isolate);
+void RunShell(v8::Handle<v8::Context> context);
+int RunMain(v8::Isolate* isolate, int argc, char* argv[]);
+bool ExecuteString(v8::Isolate* isolate,
+                   v8::Handle<v8::String> source,
+                   v8::Handle<v8::Value> name,
+                   bool print_result,
+                   bool report_exceptions);
+void Print(const v8::FunctionCallbackInfo<v8::Value>& args);
+void Read(const v8::FunctionCallbackInfo<v8::Value>& args);
+void Load(const v8::FunctionCallbackInfo<v8::Value>& args);
+void Quit(const v8::FunctionCallbackInfo<v8::Value>& args);
+void Version(const v8::FunctionCallbackInfo<v8::Value>& args);
+v8::Handle<v8::String> ReadFile(const char* name);
+void ReportException(v8::Isolate* isolate, v8::TryCatch* handler);
+
+
+static bool run_shell;
+
+
+int main(int argc, char* argv[]) {
+  v8::V8::InitializeICU();
+  v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
+  v8::Isolate* isolate = v8::Isolate::GetCurrent();
+  run_shell = (argc == 1);
+  int result;
+  {
+    v8::HandleScope handle_scope(isolate);
+    v8::Handle<v8::Context> context = CreateShellContext(isolate);
+    if (context.IsEmpty()) {
+      fprintf(stderr, "Error creating context\n");
+      return 1;
+    }
+    context->Enter();
+    result = RunMain(isolate, argc, argv);
+    if (run_shell) RunShell(context);
+    context->Exit();
+  }
+  v8::V8::Dispose();
+  return result;
+}
+
+
+// Extracts a C string from a V8 Utf8Value.
+const char* ToCString(const v8::String::Utf8Value& value) {
+  return *value ? *value : "<string conversion failed>";
+}
+
+
+// Creates a new execution environment containing the built-in
+// functions.
+v8::Handle<v8::Context> CreateShellContext(v8::Isolate* isolate) {
+  // Create a template for the global object.
+  v8::Handle<v8::ObjectTemplate> global = v8::ObjectTemplate::New();
+  // Bind the global 'print' function to the C++ Print callback.
+  global->Set(v8::String::New("print"), v8::FunctionTemplate::New(Print));
+  // Bind the global 'read' function to the C++ Read callback.
+  global->Set(v8::String::New("read"), v8::FunctionTemplate::New(Read));
+  // Bind the global 'load' function to the C++ Load callback.
+  global->Set(v8::String::New("load"), v8::FunctionTemplate::New(Load));
+  // Bind the 'quit' function
+  global->Set(v8::String::New("quit"), v8::FunctionTemplate::New(Quit));
+  // Bind the 'version' function
+  global->Set(v8::String::New("version"), v8::FunctionTemplate::New(Version));
+
+  return v8::Context::New(isolate, NULL, global);
+}
+
+
+// The callback that is invoked by v8 whenever the JavaScript 'print'
+// function is called.  Prints its arguments on stdout separated by
+// spaces and ending with a newline.
+void Print(const v8::FunctionCallbackInfo<v8::Value>& args) {
+  bool first = true;
+  for (int i = 0; i < args.Length(); i++) {
+    v8::HandleScope handle_scope(args.GetIsolate());
+    if (first) {
+      first = false;
+    } else {
+      printf(" ");
+    }
+    v8::String::Utf8Value str(args[i]);
+    const char* cstr = ToCString(str);
+    printf("%s", cstr);
+  }
+  printf("\n");
+  fflush(stdout);
+}
+
+
+// The callback that is invoked by v8 whenever the JavaScript 'read'
+// function is called.  This function loads the content of the file named in
+// the argument into a JavaScript string.
+void Read(const v8::FunctionCallbackInfo<v8::Value>& args) {
+  if (args.Length() != 1) {
+    v8::ThrowException(v8::String::New("Bad parameters"));
+    return;
+  }
+  v8::String::Utf8Value file(args[0]);
+  if (*file == NULL) {
+    v8::ThrowException(v8::String::New("Error loading file"));
+    return;
+  }
+  v8::Handle<v8::String> source = ReadFile(*file);
+  if (source.IsEmpty()) {
+    v8::ThrowException(v8::String::New("Error loading file"));
+    return;
+  }
+  args.GetReturnValue().Set(source);
+}
+
+
+// The callback that is invoked by v8 whenever the JavaScript 'load'
+// function is called.  Loads, compiles and executes its argument
+// JavaScript file.
+void Load(const v8::FunctionCallbackInfo<v8::Value>& args) {
+  for (int i = 0; i < args.Length(); i++) {
+    v8::HandleScope handle_scope(args.GetIsolate());
+    v8::String::Utf8Value file(args[i]);
+    if (*file == NULL) {
+      v8::ThrowException(v8::String::New("Error loading file"));
+      return;
+    }
+    v8::Handle<v8::String> source = ReadFile(*file);
+    if (source.IsEmpty()) {
+      v8::ThrowException(v8::String::New("Error loading file"));
+      return;
+    }
+    if (!ExecuteString(args.GetIsolate(),
+                       source,
+                       v8::String::New(*file),
+                       false,
+                       false)) {
+      v8::ThrowException(v8::String::New("Error executing file"));
+      return;
+    }
+  }
+}
+
+
+// The callback that is invoked by v8 whenever the JavaScript 'quit'
+// function is called.  Quits.
+void Quit(const v8::FunctionCallbackInfo<v8::Value>& args) {
+  // If not arguments are given args[0] will yield undefined which
+  // converts to the integer value 0.
+  int exit_code = args[0]->Int32Value();
+  fflush(stdout);
+  fflush(stderr);
+  exit(exit_code);
+}
+
+
+void Version(const v8::FunctionCallbackInfo<v8::Value>& args) {
+  args.GetReturnValue().Set(v8::String::New(v8::V8::GetVersion()));
+}
+
+
+// Reads a file into a v8 string.
+v8::Handle<v8::String> ReadFile(const char* name) {
+  FILE* file = fopen(name, "rb");
+  if (file == NULL) return v8::Handle<v8::String>();
+
+  fseek(file, 0, SEEK_END);
+  int size = ftell(file);
+  rewind(file);
+
+  char* chars = new char[size + 1];
+  chars[size] = '\0';
+  for (int i = 0; i < size;) {
+    int read = static_cast<int>(fread(&chars[i], 1, size - i, file));
+    i += read;
+  }
+  fclose(file);
+  v8::Handle<v8::String> result = v8::String::New(chars, size);
+  delete[] chars;
+  return result;
+}
+
+
+// Process remaining command line arguments and execute files
+int RunMain(v8::Isolate* isolate, int argc, char* argv[]) {
+  for (int i = 1; i < argc; i++) {
+    const char* str = argv[i];
+    if (strcmp(str, "--shell") == 0) {
+      run_shell = true;
+    } else if (strcmp(str, "-f") == 0) {
+      // Ignore any -f flags for compatibility with the other stand-
+      // alone JavaScript engines.
+      continue;
+    } else if (strncmp(str, "--", 2) == 0) {
+      fprintf(stderr,
+              "Warning: unknown flag %s.\nTry --help for options\n", str);
+    } else if (strcmp(str, "-e") == 0 && i + 1 < argc) {
+      // Execute argument given to -e option directly.
+      v8::Handle<v8::String> file_name = v8::String::New("unnamed");
+      v8::Handle<v8::String> source = v8::String::New(argv[++i]);
+      if (!ExecuteString(isolate, source, file_name, false, true)) return 1;
+    } else {
+      // Use all other arguments as names of files to load and run.
+      v8::Handle<v8::String> file_name = v8::String::New(str);
+      v8::Handle<v8::String> source = ReadFile(str);
+      if (source.IsEmpty()) {
+        fprintf(stderr, "Error reading '%s'\n", str);
+        continue;
+      }
+      if (!ExecuteString(isolate, source, file_name, false, true)) return 1;
+    }
+  }
+  return 0;
+}
+
+
+// The read-eval-execute loop of the shell.
+void RunShell(v8::Handle<v8::Context> context) {
+  fprintf(stderr, "V8 version %s [sample shell]\n", v8::V8::GetVersion());
+  static const int kBufferSize = 256;
+  // Enter the execution environment before evaluating any code.
+  v8::Context::Scope context_scope(context);
+  v8::Local<v8::String> name(v8::String::New("(shell)"));
+  while (true) {
+    char buffer[kBufferSize];
+    fprintf(stderr, "> ");
+    char* str = fgets(buffer, kBufferSize, stdin);
+    if (str == NULL) break;
+    v8::HandleScope handle_scope(context->GetIsolate());
+    ExecuteString(context->GetIsolate(),
+                  v8::String::New(str),
+                  name,
+                  true,
+                  true);
+  }
+  fprintf(stderr, "\n");
+}
+
+
+// Executes a string within the current v8 context.
+bool ExecuteString(v8::Isolate* isolate,
+                   v8::Handle<v8::String> source,
+                   v8::Handle<v8::Value> name,
+                   bool print_result,
+                   bool report_exceptions) {
+  v8::HandleScope handle_scope(isolate);
+  v8::TryCatch try_catch;
+  v8::Handle<v8::Script> script = v8::Script::Compile(source, name);
+  if (script.IsEmpty()) {
+    // Print errors that happened during compilation.
+    if (report_exceptions)
+      ReportException(isolate, &try_catch);
+    return false;
+  } else {
+    v8::Handle<v8::Value> result = script->Run();
+    if (result.IsEmpty()) {
+      assert(try_catch.HasCaught());
+      // Print errors that happened during execution.
+      if (report_exceptions)
+        ReportException(isolate, &try_catch);
+      return false;
+    } else {
+      assert(!try_catch.HasCaught());
+      if (print_result && !result->IsUndefined()) {
+        // If all went well and the result wasn't undefined then print
+        // the returned value.
+        v8::String::Utf8Value str(result);
+        const char* cstr = ToCString(str);
+        printf("%s\n", cstr);
+      }
+      return true;
+    }
+  }
+}
+
+
+void ReportException(v8::Isolate* isolate, v8::TryCatch* try_catch) {
+  v8::HandleScope handle_scope(isolate);
+  v8::String::Utf8Value exception(try_catch->Exception());
+  const char* exception_string = ToCString(exception);
+  v8::Handle<v8::Message> message = try_catch->Message();
+  if (message.IsEmpty()) {
+    // V8 didn't provide any extra information about this error; just
+    // print the exception.
+    fprintf(stderr, "%s\n", exception_string);
+  } else {
+    // Print (filename):(line number): (message).
+    v8::String::Utf8Value filename(message->GetScriptResourceName());
+    const char* filename_string = ToCString(filename);
+    int linenum = message->GetLineNumber();
+    fprintf(stderr, "%s:%i: %s\n", filename_string, linenum, exception_string);
+    // Print line of source code.
+    v8::String::Utf8Value sourceline(message->GetSourceLine());
+    const char* sourceline_string = ToCString(sourceline);
+    fprintf(stderr, "%s\n", sourceline_string);
+    // Print wavy underline (GetUnderline is deprecated).
+    int start = message->GetStartColumn();
+    for (int i = 0; i < start; i++) {
+      fprintf(stderr, " ");
+    }
+    int end = message->GetEndColumn();
+    for (int i = start; i < end; i++) {
+      fprintf(stderr, "^");
+    }
+    fprintf(stderr, "\n");
+    v8::String::Utf8Value stack_trace(try_catch->StackTrace());
+    if (stack_trace.length() > 0) {
+      const char* stack_trace_string = ToCString(stack_trace);
+      fprintf(stderr, "%s\n", stack_trace_string);
+    }
+  }
+}