- Remove the legacy debug protocol.

tools/ddbg.dart

Index: tools/ddbg.dart
diff --git a/tools/ddbg.dart b/tools/ddbg.dart
deleted file mode 100644
index f14a0170a93f82bf13f71bdfb1c1c99a6211697c..0000000000000000000000000000000000000000
--- a/tools/ddbg.dart
+++ /dev/null
@@ -1,1496 +0,0 @@
-// Copyright (c) 2012, 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.
-
-// Simple interactive debugger shell that connects to the Dart VM's debugger
-// connection port.
-
-import "dart:convert";
-import "dart:io";
-import "dart:async";
-import "dart:math";
-
-import "ddbg/lib/commando.dart";
-
-class TargetScript {
-  // The text of a script.
-  String source = null;
-
-  // A mapping from line number to source text.
-  List<String> lineToSource = null;
-
-  // A mapping from token offset to line number.
-  Map<int,int> tokenToLine = null;
-}
-
-const UnknownLocation = const {};
-
-class TargetIsolate {
-  int id;
-  // The location of the last paused event.
-  Map pausedLocation = null;
-
-  TargetIsolate(this.id);
-  bool get isPaused => pausedLocation != null;
-  String get pausedUrl => pausedLocation != null ? pausedLocation["url"] : null;
-
-  Map<String, TargetScript> scripts = {};
-}
-
-Map<int, TargetIsolate> targetIsolates= new Map<int, TargetIsolate>();
-
-Map<int, Completer> outstandingCommands;
-
-Socket vmSock;
-String vmData;
-var cmdSubscription;
-Commando cmdo;
-var vmSubscription;
-int seqNum = 0;
-
-bool isDebugging = false;
-Process targetProcess = null;
-bool suppressNextExitCode = false;
-
-final verbose = false;
-final printMessages = false;
-
-TargetIsolate currentIsolate;
-TargetIsolate mainIsolate;
-
-int debugPort = 5858;
-
-String formatLocation(Map location) {
-  if (location == null) return "";
-  var fileName = location["url"].split("/").last;
-  return "file: $fileName lib: ${location['libraryId']} token: ${location['tokenOffset']}";
-}
-
-
-Future sendCmd(Map<String, dynamic> cmd) {
-  var completer = new Completer.sync();
-  int id = cmd["id"];
-  outstandingCommands[id] = completer;
-  if (verbose) {
-    print("sending: '${JSON.encode(cmd)}'");
-  }
-  vmSock.write(JSON.encode(cmd));
-  return completer.future;
-}
-
-
-bool checkCurrentIsolate() {
-  if (vmSock == null) {
-    print("There is no active script.  Try 'help run'.");
-    return false;
-  }
-  if (currentIsolate == null) {
-    print('There is no current isolate.');
-    return false;
-  }
-  return true;
-}
-
-
-void setCurrentIsolate(TargetIsolate isolate) {
-  if (isolate != currentIsolate) {
-    currentIsolate = isolate;
-    if (mainIsolate == null) {
-      print("Main isolate is ${isolate.id}");
-      mainIsolate = isolate;
-    }
-    print("Current isolate is now ${isolate.id}");
-  }
-}
-
-
-bool checkPaused() {
-  if (!checkCurrentIsolate()) return false;
-  if (currentIsolate.isPaused) return true;
-  print("Current isolate must be paused");
-  return false;
-}
-
-// These settings are allowed in the 'set' and 'show' debugger commands.
-var validSettings = ['vm', 'vmargs', 'script', 'args'];
-
-// The current values for all settings.
-var settings = new Map();
-
-String _leftJustify(text, int width) {
-  StringBuffer buffer = new StringBuffer();
-  buffer.write(text);
-  while (buffer.length < width) {
-    buffer.write(' ');
-  }
-  return buffer.toString();
-}
-
-// TODO(turnidge): Move all commands here.
-List<Command> commandList =
-    [ new HelpCommand(),
-      new QuitCommand(),
-      new RunCommand(),
-      new KillCommand(),
-      new ConnectCommand(),
-      new DisconnectCommand(),
-      new SetCommand(),
-      new ShowCommand() ];
-
-
-List<Command> matchCommand(String commandName, bool exactMatchWins) {
-  List matches = [];
-  for (var command in commandList) {
-    if (command.name.startsWith(commandName)) {
-      if (exactMatchWins && command.name == commandName) {
-        // Exact match
-        return [command];
-      } else {
-        matches.add(command);
-      }
-    }
-  }
-  return matches;
-}
-
-abstract class Command {
-  String get name;
-  Future run(List<String> args);
-}
-
-class HelpCommand extends Command {
-  final name = 'help';
-  final helpShort = 'Show a list of debugger commands';
-  final helpLong ="""
-Show a list of debugger commands or get more information about a
-particular command.
-
-Usage:
-  help
-  help <command>
-""";
-
-  Future run(List<String> args) {
-    if (args.length == 1) {
-      print("Debugger commands:\n");
-      for (var command in commandList) {
-        print('  ${_leftJustify(command.name, 11)} ${command.helpShort}');
-      }
-
-      // TODO(turnidge): Convert all commands to use the Command class.
-      print("""
-  bt          Show backtrace
-  r           Resume execution
-  s           Single step
-  so          Step over
-  si          Step into
-  sbp [<file>] <line> Set breakpoint
-  rbp <id>    Remove breakpoint with given id
-  po <id>     Print object info for given id
-  eval fr  <n> <expr> Evaluate expr on stack frame index n
-  eval obj <id> <expr> Evaluate expr on object id
-  eval cls <id> <expr> Evaluate expr on class id
-  eval lib <id> <expr> Evaluate expr in toplevel of library id
-  pl <id> <idx> [<len>] Print list element/slice
-  pc <id>     Print class info for given id
-  ll          List loaded libraries
-  plib <id>   Print library info for given library id
-  slib <id> <true|false> Set library id debuggable
-  pg <id>     Print all global variables visible within given library id
-  ls <lib_id> List loaded scripts in library
-  gs <lib_id> <script_url> Get source text of script in library
-  tok <lib_id> <script_url> Get line and token table of script in library
-  epi <none|all|unhandled>  Set exception pause info
-  li          List ids of all isolates in the VM
-  sci <id>    Set current target isolate
-  i <id>      Interrupt execution of given isolate id
-""");
-
-      print("For more information about a particular command, type:\n\n"
-            "  help <command>\n");
-
-      print("Commands may be abbreviated: e.g. type 'h' for 'help.\n");
-    } else if (args.length == 2) {
-      var commandName = args[1];
-      var matches = matchCommand(commandName, true);
-      if (matches.length == 0) {
-        print("Command '$commandName' not recognized.  "
-              "Try 'help' for a list of commands.");
-      } else {
-        for (var command in matches) {
-          print("---- ${command.name} ----\n${command.helpLong}");
-        }
-      }
-    } else {
-      print("Command '$command' not recognized.  "
-            "Try 'help' for a list of commands.");
-    }
-
-    return new Future.value();
-  }
-}
-
-
-class QuitCommand extends Command {
-  final name = 'quit';
-  final helpShort = 'Quit the debugger.';
-  final helpLong ="""
-Quit the debugger.
-
-Usage:
-  quit
-""";
-
-  Future run(List<String> args) {
-    if (args.length > 1) {
-      print("Unexpected arguments to $name command.");
-      return new Future.value();
-    }
-    return debuggerQuit();
-  }
-}
-
-class SetCommand extends Command {
-  final name = 'set';
-  final helpShort = 'Change the value of a debugger setting.';
-  final helpLong ="""
-Change the value of a debugger setting.
-
-Usage:
-  set <setting> <value>
-
-Valid settings are:
-  ${validSettings.join('\n  ')}.
-
-See also 'help show'.
-""";
-
-  Future run(List<String> args) {
-    if (args.length < 3 || !validSettings.contains(args[1])) {
-      print("Undefined $name command.  Try 'help $name'.");
-      return new Future.value();
-    }
-    var option = args[1];
-    var value = args.getRange(2, args.length).join(' ');
-    settings[option] = value;
-    return new Future.value();
-  }
-}
-
-class ShowCommand extends Command {
-  final name = 'show';
-  final helpShort = 'Show the current value of a debugger setting.';
-  final helpLong ="""
-Show the current value of a debugger setting.
-
-Usage:
-  show
-  show <setting>
-
-If no <setting> is specified, all current settings are shown.
-
-Valid settings are:
-  ${validSettings.join('\n  ')}.
-
-See also 'help set'.
-""";
-
-  Future run(List<String> args) {
-    if (args.length == 1) {
-      for (var option in validSettings) {
-        var value = settings[option];
-        print("$option = '$value'");
-      }
-    } else if (args.length == 2 && validSettings.contains(args[1])) {
-      var option = args[1];
-      var value = settings[option];
-      if (value == null) {
-        print('$option has not been set.');
-      } else {
-        print("$option = '$value'");
-      }
-      return new Future.value();
-    } else {
-      print("Undefined $name command.  Try 'help $name'.");
-    }
-    return new Future.value();
-  }
-}
-
-class RunCommand extends Command {
-  final name = 'run';
-  final helpShort = "Run the currrent script.";
-  final helpLong ="""
-Runs the current script.
-
-Usage:
-  run
-  run <args>
-
-The current script will be run on the current vm.  The 'vm' and
-'vmargs' settings are used to specify the current vm and vm arguments.
-The 'script' and 'args' settings are used to specify the current
-script and script arguments.
-
-For more information on settings type 'help show' or 'help set'.
-
-If <args> are provided to the run command, it is the same as typing
-'set args <args>' followed by 'run'.
-""";
-
-  Future run(List<String> cmdArgs) {
-    if (isDebugging) {
-      // TODO(turnidge): Implement modal y/n dialog to stop running script.
-      print("There is already a running dart process.  "
-            "Try 'kill'.");
-      return new Future.value();
-    }
-    assert(targetProcess == null);
-    if (settings['script'] == null) {
-      print("There is no script specified.  "
-            "Use 'set script' to set the current script.");
-      return new Future.value();
-    }
-    if (cmdArgs.length > 1) {
-      settings['args'] = cmdArgs.getRange(1, cmdArgs.length);
-    }
-
-    // Build the process arguments.
-    var processArgs = ['--debug:$debugPort'];
-    if (verbose) {
-      processArgs.add('--verbose_debug');
-    }
-    if (settings['vmargs'] != null) {
-      processArgs.addAll(settings['vmargs'].split(' '));
-    }
-    processArgs.add(settings['script']);
-    if (settings['args'] != null) {
-      processArgs.addAll(settings['args'].split(' '));
-    }
-    String vm = settings['vm'];
-
-    isDebugging = true;
-    cmdo.hide();
-    return Process.start(vm, processArgs).then((process) {
-        print("Started process ${process.pid} '$vm ${processArgs.join(' ')}'");
-        targetProcess = process;
-        process.stdin.close();
-
-        // TODO(turnidge): For now we only show full lines of output
-        // from the debugged process.  Should show each character.
-        process.stdout
-            .transform(UTF8.decoder)
-            .transform(new LineSplitter())
-            .listen((String line) {
-                cmdo.hide();
-                // TODO(turnidge): Escape output in any way?
-                print(line);
-                cmdo.show();
-              });
-
-        process.stderr
-            .transform(UTF8.decoder)
-            .transform(new LineSplitter())
-            .listen((String line) {
-                cmdo.hide();
-                print(line);
-                cmdo.show();
-              });
-
-        process.exitCode.then((int exitCode) {
-            cmdo.hide();
-            if (suppressNextExitCode) {
-              suppressNextExitCode = false;
-            } else {
-              if (exitCode == 0) {
-                print('Process exited normally.');
-              } else {
-                print('Process exited with code $exitCode.');
-              }
-            }
-            targetProcess = null;
-            cmdo.show();
-          });
-
-        // Wait for the vm to open the debugging port.
-        return openVmSocket(0);
-      });
-  }
-}
-
-class KillCommand extends Command {
-  final name = 'kill';
-  final helpShort = 'Kill the currently executing script.';
-  final helpLong ="""
-Kill the currently executing script.
-
-Usage:
-  kill
-""";
-
-  Future run(List<String> cmdArgs) {
-    if (!isDebugging) {
-      print('There is no running script.');
-      return new Future.value();
-    }
-    if (targetProcess == null) {
-      print("The active dart process was not started with 'run'. "
-            "Try 'disconnect' instead.");
-      return new Future.value();
-    }
-    assert(targetProcess != null);
-    bool result = targetProcess.kill();
-    if (result) {
-      print('Process killed.');
-      suppressNextExitCode = true;
-    } else {
-      print('Unable to kill process ${targetProcess.pid}');
-    }
-    return new Future.value();
-  }
-}
-
-class ConnectCommand extends Command {
-  final name = 'connect';
-  final helpShort = "Connect to a running dart script.";
-  final helpLong ="""
-Connect to a running dart script.
-
-Usage:
-  connect
-  connect <port>
-
-The debugger will connect to a dart script which has already been
-started with the --debug option.  If no port is provided, the debugger
-will attempt to connect on the default debugger port.
-""";
-
-  Future run(List<String> cmdArgs) {
-    if (cmdArgs.length > 2) {
-      print("Too many arguments to 'connect'.");
-    }
-    if (isDebugging) {
-      // TODO(turnidge): Implement modal y/n dialog to stop running script.
-      print("There is already a running dart process.  "
-            "Try 'kill'.");
-      return new Future.value();
-    }
-    assert(targetProcess == null);
-    if (cmdArgs.length == 2) {
-      debugPort = int.parse(cmdArgs[1]);
-    }
-
-    isDebugging = true;
-    cmdo.hide();
-    return openVmSocket(0);
-  }
-}
-
-class DisconnectCommand extends Command {
-  final name = 'disconnect';
-  final helpShort = "Disconnect from a running dart script.";
-  final helpLong ="""
-Disconnect from a running dart script.
-
-Usage:
-  disconnect
-
-The debugger will disconnect from a dart script's debugging port.  The
-script must have been connected to earlier with the 'connect' command.
-""";
-
-  Future run(List<String> cmdArgs) {
-    if (cmdArgs.length > 1) {
-      print("Too many arguments to 'disconnect'.");
-    }
-    if (!isDebugging) {
-      // TODO(turnidge): Implement modal y/n dialog to stop running script.
-      print("There is no active dart process.  "
-            "Try 'connect'.");
-      return new Future.value();
-    }
-    if (targetProcess != null) {
-      print("The active dart process was started with 'run'.  "
-            "Try 'kill'.");
-    }
-
-    cmdo.hide();
-    return closeVmSocket();
-  }
-}
-
-typedef void HandlerType(Map response);
-
-HandlerType showPromptAfter(void handler(Map response)) {
-  return (response) {
-    handler(response);
-    cmdo.show();
-  };
-}
-
-void processCommand(String cmdLine) {
-  void huh() {
-    print("'$cmdLine' not understood, try 'help' for help.");
-  }
-
-  cmdo.hide();
-  seqNum++;
-  cmdLine = cmdLine.trim();
-  var args = cmdLine.split(' ');
-  if (args.length == 0) {
-    return;
-  }
-  var command = args[0];
-
-  var resume_commands =
-      { 'r':'resume', 's':'stepOver', 'si':'stepInto', 'so':'stepOut'};
-  if (resume_commands[command] != null) {
-    if (!checkPaused()) {
-      cmdo.show();
-      return;
-    }
-    var cmd = { "id": seqNum,
-                "command": resume_commands[command],
-                "params": { "isolateId" : currentIsolate.id } };
-    sendCmd(cmd).then(showPromptAfter(handleResumedResponse));
-  } else if (command == "bt") {
-    if (!checkCurrentIsolate()) {
-      cmdo.show();
-      return;
-    }
-    var cmd = { "id": seqNum,
-                "command": "getStackTrace",
-                "params": { "isolateId" : currentIsolate.id } };
-    sendCmd(cmd).then(showPromptAfter(handleStackTraceResponse));
-  } else if (command == "ll") {
-    if (!checkCurrentIsolate()) {
-      cmdo.show();
-      return;
-    }
-    var cmd = { "id": seqNum,
-                "command": "getLibraries",
-                "params": { "isolateId" : currentIsolate.id } };
-    sendCmd(cmd).then(showPromptAfter(handleGetLibraryResponse));
-  } else if (command == "sbp" && args.length >= 2) {
-    if (!checkCurrentIsolate()) {
-      cmdo.show();
-      return;
-    }
-    var url, line;
-    if (args.length == 2 && currentIsolate.pausedUrl != null) {
-      url = currentIsolate.pausedUrl;
-      line = int.parse(args[1]);
-    } else {
-      url = args[1];
-      line = int.parse(args[2]);
-    }
-    var cmd = { "id": seqNum,
-                "command": "setBreakpoint",
-                "params": { "isolateId" : currentIsolate.id,
-                            "url": url,
-                            "line": line }};
-    sendCmd(cmd).then(showPromptAfter(handleSetBpResponse));
-  } else if (command == "rbp" && args.length == 2) {
-    if (!checkCurrentIsolate()) {
-      cmdo.show();
-      return;
-    }
-    var cmd = { "id": seqNum,
-                "command": "removeBreakpoint",
-                "params": { "isolateId" : currentIsolate.id,
-                            "breakpointId": int.parse(args[1]) } };
-    sendCmd(cmd).then(showPromptAfter(handleGenericResponse));
-  } else if (command == "ls" && args.length == 2) {
-    if (!checkCurrentIsolate()) {
-      cmdo.show();
-      return;
-    }
-    var cmd = { "id": seqNum,
-                "command": "getScriptURLs",
-                "params": { "isolateId" : currentIsolate.id,
-                            "libraryId": int.parse(args[1]) } };
-    sendCmd(cmd).then(showPromptAfter(handleGetScriptsResponse));
-  } else if (command == "eval" && args.length > 3) {
-    if (!checkCurrentIsolate()) {
-      cmdo.show();
-      return;
-    }
-    var expr = args.getRange(3, args.length).join(" ");
-    var target = args[1];
-    if (target == "obj") {
-      target = "objectId";
-    } else if (target == "cls") {
-      target = "classId";
-    } else if (target == "lib") {
-      target = "libraryId";
-    } else if (target == "fr") {
-      target = "frameId";
-    } else {
-      huh();
-      return;
-    }
-    var cmd = { "id": seqNum,
-                "command": "evaluateExpr",
-                "params": { "isolateId": currentIsolate.id,
-                            target: int.parse(args[2]),
-                            "expression": expr } };
-    sendCmd(cmd).then(showPromptAfter(handleEvalResponse));
-  } else if (command == "po" && args.length == 2) {
-    if (!checkCurrentIsolate()) {
-      cmdo.show();
-      return;
-    }
-    var cmd = { "id": seqNum,
-                "command": "getObjectProperties",
-                "params": { "isolateId" : currentIsolate.id,
-                            "objectId": int.parse(args[1]) } };
-    sendCmd(cmd).then(showPromptAfter(handleGetObjPropsResponse));
-  } else if (command == "pl" && args.length >= 3) {
-    if (!checkCurrentIsolate()) {
-      cmdo.show();
-      return;
-    }
-    var cmd;
-    if (args.length == 3) {
-      cmd = { "id": seqNum,
-              "command": "getListElements",
-              "params": { "isolateId" : currentIsolate.id,
-                          "objectId": int.parse(args[1]),
-                          "index": int.parse(args[2]) } };
-    } else {
-      cmd = { "id": seqNum,
-              "command": "getListElements",
-              "params": { "isolateId" : currentIsolate.id,
-                          "objectId": int.parse(args[1]),
-                          "index": int.parse(args[2]),
-                          "length": int.parse(args[3]) } };
-    }
-    sendCmd(cmd).then(showPromptAfter(handleGetListResponse));
-  } else if (command == "pc" && args.length == 2) {
-    if (!checkCurrentIsolate()) {
-      cmdo.show();
-      return;
-    }
-    var cmd = { "id": seqNum,
-                "command": "getClassProperties",
-                "params": { "isolateId" : currentIsolate.id,
-                            "classId": int.parse(args[1]) } };
-    sendCmd(cmd).then(showPromptAfter(handleGetClassPropsResponse));
-  } else if (command == "plib" && args.length == 2) {
-    if (!checkCurrentIsolate()) {
-      cmdo.show();
-      return;
-    }
-    var cmd = { "id": seqNum,
-                "command": "getLibraryProperties",
-                "params": {"isolateId" : currentIsolate.id,
-                           "libraryId": int.parse(args[1]) } };
-    sendCmd(cmd).then(showPromptAfter(handleGetLibraryPropsResponse));
-  } else if (command == "slib" && args.length == 3) {
-    if (!checkCurrentIsolate()) {
-      cmdo.show();
-      return;
-    }
-    var cmd = { "id": seqNum,
-                "command": "setLibraryProperties",
-                "params": {"isolateId" : currentIsolate.id,
-                           "libraryId": int.parse(args[1]),
-                           "debuggingEnabled": args[2] } };
-    sendCmd(cmd).then(showPromptAfter(handleSetLibraryPropsResponse));
-  } else if (command == "pg" && args.length == 2) {
-    if (!checkCurrentIsolate()) {
-      cmdo.show();
-      return;
-    }
-    var cmd = { "id": seqNum,
-                "command": "getGlobalVariables",
-                "params": { "isolateId" : currentIsolate.id,
-                            "libraryId": int.parse(args[1]) } };
-    sendCmd(cmd).then(showPromptAfter(handleGetGlobalVarsResponse));
-  } else if (command == "gs" && args.length == 3) {
-    if (!checkCurrentIsolate()) {
-      cmdo.show();
-      return;
-    }
-    var cmd = { "id": seqNum,
-                "command":  "getScriptSource",
-                "params": { "isolateId" : currentIsolate.id,
-                            "libraryId": int.parse(args[1]),
-                            "url": args[2] } };
-    sendCmd(cmd).then(showPromptAfter(handleGetSourceResponse));
-  } else if (command == "tok" && args.length == 3) {
-    if (!checkCurrentIsolate()) {
-      cmdo.show();
-      return;
-    }
-    var cmd = { "id": seqNum,
-                "command":  "getLineNumberTable",
-                "params": { "isolateId" : currentIsolate.id,
-                            "libraryId": int.parse(args[1]),
-                            "url": args[2] } };
-    sendCmd(cmd).then(showPromptAfter(handleGetLineTableResponse));
-  } else if (command == "epi" && args.length == 2) {
-    if (!checkCurrentIsolate()) {
-      cmdo.show();
-      return;
-    }
-    var cmd = { "id": seqNum,
-                "command":  "setPauseOnException",
-                "params": { "isolateId" : currentIsolate.id,
-                            "exceptions": args[1] } };
-    sendCmd(cmd).then(showPromptAfter(handleGenericResponse));
-  } else if (command == "li") {
-    if (!checkCurrentIsolate()) {
-      cmdo.show();
-      return;
-    }
-    var cmd = { "id": seqNum, "command": "getIsolateIds" };
-    sendCmd(cmd).then(showPromptAfter(handleGetIsolatesResponse));
-  } else if (command == "sci" && args.length == 2) {
-    var id = int.parse(args[1]);
-    if (targetIsolates[id] != null) {
-      setCurrentIsolate(targetIsolates[id]);
-    } else {
-      print("$id is not a valid isolate id");
-    }
-    cmdo.show();
-  } else if (command == "i" && args.length == 2) {
-    var cmd = { "id": seqNum,
-                "command": "interrupt",
-                "params": { "isolateId": int.parse(args[1]) } };
-    sendCmd(cmd).then(showPromptAfter(handleGenericResponse));
-  } else if (command.length == 0) {
-    huh();
-    cmdo.show();
-  } else {
-    // TODO(turnidge): Use this for all commands.
-    var matches = matchCommand(command, true);
-    if (matches.length == 0) {
-      huh();
-      cmdo.show();
-    } else if (matches.length == 1) {
-      matches[0].run(args).then((_) {
-          cmdo.show();
-        });
-    } else {
-      var matchNames = matches.map((handler) => handler.name);
-      print("Ambiguous command '$command' : ${matchNames.toList()}");
-      cmdo.show();
-    }
-  }
-}
-
-
-void processError(error, trace) {
-  cmdo.hide();
-  print("\nInternal error:\n$error\n$trace");
-  cmdo.show();
-}
-
-
-void processDone() {
-  debuggerQuit();
-}
-
-
-String remoteObject(value) {
-  var kind = value["kind"];
-  var text = value["text"];
-  var id = value["objectId"];
-  if (kind == "string") {
-    return "(string, id $id) '$text'";
-  } else if (kind == "list") {
-    var len = value["length"];
-    return "(list, id $id, len $len) $text";
-  } else if (kind == "object") {
-    return "(obj, id $id) $text";
-  } else if (kind == "function") {
-    var location = formatLocation(value['location']);
-    var name = value['name'];
-    var signature = value['signature'];
-    return "(closure ${name}${signature} $location)";
-  } else {
-    return "$text";
-  }
-}
-
-
-printNamedObject(obj) {
-  var name = obj["name"];
-  var value = obj["value"];
-  print("  $name = ${remoteObject(value)}");
-}
-
-
-handleGetObjPropsResponse(Map response) {
-  Map props = response["result"];
-  int class_id = props["classId"];
-  if (class_id == -1) {
-    print("  null");
-    return;
-  }
-  List fields = props["fields"];
-  print("  class id: $class_id");
-  for (int i = 0; i < fields.length; i++) {
-    printNamedObject(fields[i]);
-  }
-}
-
-handleGetListResponse(Map response) {
-  Map result = response["result"];
-  if (result["elements"] != null) {
-    // List slice.
-    var index = result["index"];
-    var length = result["length"];
-    List elements = result["elements"];
-    assert(length == elements.length);
-    for (int i = 0; i < length; i++) {
-      var kind = elements[i]["kind"];
-      var text = elements[i]["text"];
-      print("  ${index + i}: ($kind) $text");
-    }
-  } else {
-    // One element, a remote object.
-    print(result);
-    print("  ${remoteObject(result)}");
-  }
-}
-
-
-handleGetClassPropsResponse(Map response) {
-  Map props = response["result"];
-  assert(props["name"] != null);
-  int libId = props["libraryId"];
-  assert(libId != null);
-  print("  class ${props["name"]} (library id: $libId)");
-  List fields = props["fields"];
-  if (fields.length > 0) {
-    print("  static fields:");
-    for (int i = 0; i < fields.length; i++) {
-      printNamedObject(fields[i]);
-    }
-  }
-}
-
-
-handleGetLibraryPropsResponse(Map response) {
-  Map props = response["result"];
-  assert(props["url"] != null);
-  print("  library url: ${props["url"]}");
-  assert(props["debuggingEnabled"] != null);
-  print("  debugging enabled: ${props["debuggingEnabled"]}");
-  List imports = props["imports"];
-  assert(imports != null);
-  if (imports.length > 0) {
-    print("  imports:");
-    for (int i = 0; i < imports.length; i++) {
-      print("    id ${imports[i]["libraryId"]} prefix ${imports[i]["prefix"]}");
-    }
-  }
-  List globals = props["globals"];
-  assert(globals != null);
-  if (globals.length > 0) {
-    print("  global variables:");
-    for (int i = 0; i < globals.length; i++) {
-      printNamedObject(globals[i]);
-    }
-  }
-}
-
-
-handleSetLibraryPropsResponse(Map response) {
-  Map props = response["result"];
-  assert(props["debuggingEnabled"] != null);
-  print("  debugging enabled: ${props["debuggingEnabled"]}");
-}
-
-
-handleGetGlobalVarsResponse(Map response) {
-  List globals = response["result"]["globals"];
-  for (int i = 0; i < globals.length; i++) {
-    printNamedObject(globals[i]);
-  }
-}
-
-
-handleGetSourceResponse(Map response) {
-  Map result = response["result"];
-  String source = result["text"];
-  print("Source text:\n$source\n--------");
-}
-
-
-handleGetLineTableResponse(Map response) {
-  Map result = response["result"];
-  var info = result["lines"];
-  print("Line info table:\n$info");
-}
-
-
-void handleGetIsolatesResponse(Map response) {
-  Map result = response["result"];
-  List ids = result["isolateIds"];
-  assert(ids != null);
-  print("List of isolates:");
-  for (int id in ids) {
-    TargetIsolate isolate = targetIsolates[id];
-    var state = (isolate != null) ? "running" : "<unknown isolate>";
-    if (isolate != null && isolate.isPaused) {
-      var loc = formatLocation(isolate.pausedLocation);
-      state = "paused at $loc";
-    }
-    var marker = " ";
-    if (currentIsolate != null && id == currentIsolate.id) {
-      marker = "*";
-    }
-    print("$marker $id $state");
-  }
-}
-
-
-void handleGetLibraryResponse(Map response) {
-  Map result = response["result"];
-  List libs = result["libraries"];
-  print("Loaded libraries:");
-  print(libs);
-  for (int i = 0; i < libs.length; i++) {
-    print("  ${libs[i]["id"]} ${libs[i]["url"]}");
-  }
-}
-
-
-void handleGetScriptsResponse(Map response) {
-  Map result = response["result"];
-  List urls = result["urls"];
-  print("Loaded scripts:");
-  for (int i = 0; i < urls.length; i++) {
-    print("  $i ${urls[i]}");
-  }
-}
-
-
-void handleEvalResponse(Map response) {
-  Map result = response["result"];
-  print(remoteObject(result));
-}
-
-
-void handleSetBpResponse(Map response) {
-  Map result = response["result"];
-  var id = result["breakpointId"];
-  assert(id != null);
-  print("Set BP $id");
-}
-
-
-void handleGenericResponse(Map response) {
-  if (response["error"] != null) {
-    print("Error: ${response["error"]}");
-  }
-}
-
-void handleResumedResponse(Map response) {
-  if (response["error"] != null) {
-    print("Error: ${response["error"]}");
-    return;
-  }
-  assert(currentIsolate != null);
-  currentIsolate.pausedLocation = null;
-}
-
-
-void handleStackTraceResponse(Map response) {
-  Map result = response["result"];
-  List callFrames = result["callFrames"];
-  assert(callFrames != null);
-  printStackTrace(callFrames);
-}
-
-
-void printStackFrame(frame_num, Map frame) {
-  var fname = frame["functionName"];
-  var loc = formatLocation(frame["location"]);
-  print("#${_leftJustify(frame_num,2)} $fname at $loc");
-  List locals = frame["locals"];
-  for (int i = 0; i < locals.length; i++) {
-    printNamedObject(locals[i]);
-  }
-}
-
-
-void printStackTrace(List frames) {
-  for (int i = 0; i < frames.length; i++) {
-    printStackFrame(i, frames[i]);
-  }
-}
-
-
-Map<int, int> parseLineNumberTable(List<List<int>> table) {
-  Map tokenToLine = {};
-  for (var line in table) {
-    // Each entry begins with a line number...
-    var lineNumber = line[0];
-    for (var pos = 1; pos < line.length; pos += 2) {
-      // ...and is followed by (token offset, col number) pairs.
-      // We ignore the column numbers.
-      var tokenOffset = line[pos];
-      tokenToLine[tokenOffset] = lineNumber;
-    }
-  }
-  return tokenToLine;
-}
-
-
-Future<TargetScript> getTargetScript(Map location) {
-  var isolate = targetIsolates[currentIsolate.id];
-  var url = location['url'];
-  var script = isolate.scripts[url];
-  if (script != null) {
-    return new Future.value(script);
-  }
-  script = new TargetScript();
-
-  // Ask the vm for the source and line number table.
-  var sourceCmd = {
-    "id": seqNum++,
-    "command":  "getScriptSource",
-    "params": { "isolateId": currentIsolate.id,
-                "libraryId": location['libraryId'],
-                "url": url } };
-
-  var lineNumberCmd = {
-    "id": seqNum++,
-    "command":  "getLineNumberTable",
-    "params": { "isolateId": currentIsolate.id,
-                "libraryId": location['libraryId'],
-                "url": url } };
-
-  // Send the source command
-  var sourceResponse = sendCmd(sourceCmd).then((response) {
-      Map result = response["result"];
-      script.source = result['text'];
-      // Line numbers are 1-based so add a dummy for line 0.
-      script.lineToSource = [''];
-      script.lineToSource.addAll(script.source.split('\n'));
-    });
-
-  // Send the line numbers command
-  var lineNumberResponse = sendCmd(lineNumberCmd).then((response) {
-      Map result = response["result"];
-      script.tokenToLine = parseLineNumberTable(result['lines']);
-    });
-
-  return Future.wait([sourceResponse, lineNumberResponse]).then((_) {
-      // When both commands complete, cache the result.
-      isolate.scripts[url] = script;
-      return script;
-    });
-}
-
-
-Future printLocation(String label, Map location) {
-  // Figure out the line number.
-  return getTargetScript(location).then((script) {
-      var lineNumber = script.tokenToLine[location['tokenOffset']];
-      var text = script.lineToSource[lineNumber];
-      if (label != null) {
-        var fileName = location['url'].split("/").last;
-        print("$label \n"
-              "    at $fileName:$lineNumber");
-      }
-      print("${_leftJustify(lineNumber, 8)}$text");
-    });
-}
-
-
-Future handlePausedEvent(msg) {
-  assert(msg["params"] != null);
-  var reason = msg["params"]["reason"];
-  int isolateId = msg["params"]["isolateId"];
-  assert(isolateId != null);
-  var isolate = targetIsolates[isolateId];
-  assert(isolate != null);
-  assert(!isolate.isPaused);
-  var location = msg["params"]["location"];;
-  setCurrentIsolate(isolate);
-  isolate.pausedLocation = (location == null) ? UnknownLocation : location;
-  if (reason == "breakpoint") {
-    assert(location != null);
-    var bpId = (msg["params"]["breakpointId"]);
-    var label = (bpId != null) ? "Breakpoint $bpId" : null;
-    return printLocation(label, location);
-  } else if (reason == "interrupted") {
-    assert(location != null);
-    return printLocation("Interrupted", location);
-  } else {
-    assert(reason == "exception");
-    var excObj = msg["params"]["exception"];
-    print("Isolate $isolateId paused on exception");
-    print(remoteObject(excObj));
-    return new Future.value();
-  }
-}
-
-void handleIsolateEvent(msg) {
-  Map params = msg["params"];
-  assert(params != null);
-  var isolateId = params["id"];
-  var reason = params["reason"];
-  if (reason == "created") {
-    print("Isolate $isolateId has been created.");
-    assert(targetIsolates[isolateId] == null);
-    targetIsolates[isolateId] = new TargetIsolate(isolateId);
-  } else {
-    assert(reason == "shutdown");
-    var isolate = targetIsolates.remove(isolateId);
-    assert(isolate != null);
-    if (isolate == mainIsolate) {
-      mainIsolate = null;
-      print("Main isolate ${isolate.id} has terminated.");
-    } else {
-      print("Isolate ${isolate.id} has terminated.");
-    }
-    if (isolate == currentIsolate) {
-      currentIsolate = mainIsolate;
-      if (currentIsolate == null && !targetIsolates.isEmpty) {
-        currentIsolate = targetIsolates.values.first;
-      }
-      if (currentIsolate != null) {
-        print("Setting current isolate to ${currentIsolate.id}.");
-      } else {
-        print("All isolates have terminated.");
-      }
-    }
-  }
-}
-
-void processVmMessage(String jsonString) {
-  var msg = JSON.decode(jsonString);
-  if (msg == null) {
-    return;
-  }
-  var event = msg["event"];
-  if (event == "isolate") {
-    cmdo.hide();
-    handleIsolateEvent(msg);
-    cmdo.show();
-    return;
-  }
-  if (event == "paused") {
-    cmdo.hide();
-    handlePausedEvent(msg).then((_) {
-        cmdo.show();
-      });
-    return;
-  }
-  if (event == "breakpointResolved") {
-    Map params = msg["params"];
-    assert(params != null);
-    var isolateId = params["isolateId"];
-    var location = formatLocation(params["location"]);
-    cmdo.hide();
-    print("Breakpoint ${params["breakpointId"]} resolved in isolate $isolateId"
-          " at $location.");
-    cmdo.show();
-    return;
-  }
-  if (msg["id"] != null) {
-    var id = msg["id"];
-    if (outstandingCommands.containsKey(id)) {
-      var completer = outstandingCommands.remove(id);
-      if (msg["error"] != null) {
-        print("VM says: ${msg["error"]}");
-        // TODO(turnidge): Rework how hide/show happens.  For now we
-        // show here explicitly.
-        cmdo.show();
-      } else {
-        completer.complete(msg);
-      }
-    }
-  }
-}
-
-bool haveGarbageVmData() {
-  if (vmData == null || vmData.length == 0) return false;
-  var i = 0, char = " ";
-  while (i < vmData.length) {
-    char = vmData[i];
-    if (char != " " && char != "\n" && char != "\r" && char != "\t") break;
-    i++;
-  }
-  if (i >= vmData.length) {
-    return false;
-  } else {
-    return char != "{";
-  }
-}
-
-
-void processVmData(String data) {
-  if (vmData == null || vmData.length == 0) {
-    vmData = data;
-  } else {
-    vmData = vmData + data;
-  }
-  if (haveGarbageVmData()) {
-    print("Error: have garbage data from VM: '$vmData'");
-    return;
-  }
-  int msg_len = jsonObjectLength(vmData);
-  if (printMessages && msg_len == 0) {
-    print("have partial or illegal json message"
-          " of ${vmData.length} chars:\n'$vmData'");
-    return;
-  }
-  while (msg_len > 0 && msg_len <= vmData.length) {
-    if (msg_len == vmData.length) {
-      if (printMessages) { print("have one full message:\n$vmData"); }
-      processVmMessage(vmData);
-      vmData = null;
-      return;
-    }
-    if (printMessages) { print("at least one message: '$vmData'"); }
-    var msg = vmData.substring(0, msg_len);
-    if (printMessages) { print("first message: $msg"); }
-    vmData = vmData.substring(msg_len);
-    if (haveGarbageVmData()) {
-      print("Error: garbage data after previous message: '$vmData'");
-      print("Previous message was: '$msg'");
-      return;
-    }
-    processVmMessage(msg);
-    msg_len = jsonObjectLength(vmData);
-  }
-  if (printMessages) { print("leftover vm data '$vmData'"); }
-}
-
-/**
- * Skip past a JSON object value.
- * The object value must start with '{' and continues to the
- * matching '}'. No attempt is made to otherwise validate the contents
- * as JSON. If it is invalid, a later [parseJson] will fail.
- */
-int jsonObjectLength(String string) {
-  int skipWhitespace(int index) {
-    while (index < string.length) {
-      String char = string[index];
-      if (char != " " && char != "\n" && char != "\r" && char != "\t") break;
-      index++;
-    }
-    return index;
-  }
-  int skipString(int index) {
-    assert(string[index - 1] == '"');
-    while (index < string.length) {
-      String char = string[index];
-      if (char == '"') return index + 1;
-      if (char == r'\') index++;
-      if (index == string.length) return index;
-      index++;
-    }
-    return index;
-  }
-  int index = 0;
-  index = skipWhitespace(index);
-  // Bail out if the first non-whitespace character isn't '{'.
-  if (index == string.length || string[index] != '{') return 0;
-  int nesting = 0;
-  while (index < string.length) {
-    String char = string[index++];
-    if (char == '{') {
-      nesting++;
-    } else if (char == '}') {
-      nesting--;
-      if (nesting == 0) return index;
-    } else if (char == '"') {
-      // Strings can contain braces. Skip their content.
-      index = skipString(index);
-    }
-  }
-  return 0;
-}
-
-List<String> debuggerCommandCompleter(List<String> commandParts) {
-  List<String> completions = new List<String>();
-
-  // TODO(turnidge): Have a global command table and use it to for
-  // help messages, command completion, and command dispatching.  For now
-  // we hardcode the list here.
-  //
-  // TODO(turnidge): Implement completion for arguments as well.
-  List<String> oldCommands = ['bt', 'r', 's', 'so', 'si', 'sbp', 'rbp',
-                              'po', 'eval', 'pl', 'pc', 'll', 'plib', 'slib',
-                              'pg', 'ls', 'gs', 'tok', 'epi', 'li', 'i' ];
-
-  // Completion of first word in the command.
-  if (commandParts.length == 1) {
-    String prefix = commandParts.last;
-    for (var command in oldCommands) {
-      if (command.startsWith(prefix)) {
-        completions.add(command);
-      }
-    }
-    for (var command in commandList) {
-      if (command.name.startsWith(prefix)) {
-        completions.add(command.name);
-      }
-    }
-  }
-
-  return completions;
-}
-
-Future closeCommando() {
-  var subscription = cmdSubscription;
-  cmdSubscription = null;
-  cmdo = null;
-
-  var future = subscription.cancel();
-  if (future != null) {
-    return future;
-  } else {
-    return new Future.value();
-  }
-}
-
-
-Future openVmSocket(int attempt) {
-  return Socket.connect("127.0.0.1", debugPort).then(
-      setupVmSocket,
-      onError: (e) {
-        // We were unable to connect to the debugger's port.  Try again.
-        retryOpenVmSocket(e, attempt);
-      });
-}
-
-
-void setupVmSocket(Socket s) {
-  vmSock = s;
-  vmSock.setOption(SocketOption.TCP_NODELAY, true);
-  var stringStream = vmSock.transform(UTF8.decoder);
-  outstandingCommands = new Map<int, Completer>();
-  vmSubscription = stringStream.listen(
-      (String data) {
-        processVmData(data);
-      },
-      onDone: () {
-        cmdo.hide();
-        if (verbose) {
-          print("VM debugger connection closed");
-        }
-        closeVmSocket().then((_) {
-            cmdo.show();
-          });
-      },
-      onError: (err) {
-        cmdo.hide();
-        // TODO(floitsch): do we want to print the stack trace?
-        print("Error in debug connection: $err");
-
-        // TODO(turnidge): Kill the debugged process here?
-        closeVmSocket().then((_) {
-            cmdo.show();
-          });
-      });
-}
-
-
-Future retryOpenVmSocket(error, int attempt) {
-  var delay;
-  if (attempt < 10) {
-    delay = new Duration(milliseconds:10);
-  } else if (attempt < 20) {
-    delay = new Duration(seconds:1);
-  } else {
-    // Too many retries.  Give up.
-    //
-    // TODO(turnidge): Kill the debugged process here?
-    print('Timed out waiting for debugger to start.\nError: $e');
-    return closeVmSocket();
-  }
-  // Wait and retry.
-  return new Future.delayed(delay, () {
-      openVmSocket(attempt + 1);
-    });
-}
-
-
-Future closeVmSocket() {
-  if (vmSubscription == null) {
-    // Already closed, nothing to do.
-    assert(vmSock == null);
-    return new Future.value();
-  }
-
-  isDebugging = false;
-  var subscription = vmSubscription;
-  var sock = vmSock;
-
-  // Wait for the socket to close and the subscription to be
-  // cancelled.  Perhaps overkill, but it means we know these will be
-  // done.
-  //
-  // This is uglier than it needs to be since cancel can return null.
-  var cleanupFutures = [sock.close()];
-  var future = subscription.cancel();
-  if (future != null) {
-    cleanupFutures.add(future);
-  }
-
-  vmSubscription = null;
-  vmSock = null;
-  outstandingCommands = null;
-  return Future.wait(cleanupFutures);
-}
-
-void debuggerError(self, parent, zone, error, StackTrace trace) {
-  print('\n--------\nExiting due to unexpected error:\n'
-        '  $error\n$trace\n');
-  debuggerQuit();
-}
-
-Future debuggerQuit() {
-  // Kill target process, if any.
-  if (targetProcess != null) {
-    if (!targetProcess.kill()) {
-      print('Unable to kill process ${targetProcess.pid}');
-    }
-  }
-
-  // Restore terminal settings, close connections.
-  return Future.wait([closeCommando(), closeVmSocket()]).then((_) {
-      exit(0);
-
-      // Unreachable.
-      return new Future.value();
-    });
-}
-
-
-void parseArgs(List<String> args) {
-  int pos = 0;
-  settings['vm'] = Platform.executable;
-  while (pos < args.length && args[pos].startsWith('-')) {
-    pos++;
-  }
-  if (pos < args.length) {
-    settings['vmargs'] = args.getRange(0, pos).join(' ');
-    settings['script'] = args[pos];
-    settings['args'] = args.getRange(pos + 1, args.length).join(' ');
-  }
-}
-
-void main(List<String> args) {
-  // Setup a zone which will exit the debugger cleanly on any uncaught
-  // exception.
-  var zone = Zone.ROOT.fork(specification:new ZoneSpecification(
-      handleUncaughtError: debuggerError));
-
-  zone.run(() {
-      parseArgs(args);
-      cmdo = new Commando(completer: debuggerCommandCompleter);
-      cmdSubscription = cmdo.commands.listen(processCommand,
-                                             onError: processError,
-                                             onDone: processDone);
-    });
-}