text: // Copyright 2006-2012 the V8 project authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  (function(global, utils) {
  "use strict";
  
  // ----------------------------------------------------------------------------
  // Imports
  
  var ErrorToString;
  var GlobalArray = global.Array;
  var IsNaN = global.isNaN;
  var JSONStringify = global.JSON.stringify;
  var MakeError;
  var MapEntries;
  var MapIteratorNext;
  var MathMin = global.Math.min;
  var promiseStatusSymbol = utils.ImportNow("promise_status_symbol");
  var promiseValueSymbol = utils.ImportNow("promise_value_symbol");
  var SetIteratorNext;
  var SetValues;
  var SymbolToString;
  
  utils.Import(function(from) {
    ErrorToString = from.ErrorToString;
    MakeError = from.MakeError;
    MapEntries = from.MapEntries;
    MapIteratorNext = from.MapIteratorNext;
    SetIteratorNext = from.SetIteratorNext;
    SetValues = from.SetValues;
    SymbolToString = from.SymbolToString;
  });
  
  // ----------------------------------------------------------------------------
  
  // Mirror hierarchy:
  // - Mirror
  //   - ValueMirror
  //     - UndefinedMirror
  //     - NullMirror
  //     - BooleanMirror
  //     - NumberMirror
  //     - StringMirror
  //     - SymbolMirror
  //     - ObjectMirror
  //       - FunctionMirror
  //         - UnresolvedFunctionMirror
  //       - ArrayMirror
  //       - DateMirror
  //       - RegExpMirror
  //       - ErrorMirror
  //       - PromiseMirror
  //       - MapMirror
  //       - SetMirror
  //       - IteratorMirror
  //       - GeneratorMirror
  //   - PropertyMirror
  //   - InternalPropertyMirror
  //   - FrameMirror
  //   - ScriptMirror
  //   - ScopeMirror
  
  // Type names of the different mirrors.
  var MirrorType = {
    UNDEFINED_TYPE : 'undefined',
    NULL_TYPE : 'null',
    BOOLEAN_TYPE : 'boolean',
    NUMBER_TYPE : 'number',
    STRING_TYPE : 'string',
    SYMBOL_TYPE : 'symbol',
    OBJECT_TYPE : 'object',
    FUNCTION_TYPE : 'function',
    REGEXP_TYPE : 'regexp',
    ERROR_TYPE : 'error',
    PROPERTY_TYPE : 'property',
    INTERNAL_PROPERTY_TYPE : 'internalProperty',
    FRAME_TYPE : 'frame',
    SCRIPT_TYPE : 'script',
    CONTEXT_TYPE : 'context',
    SCOPE_TYPE : 'scope',
    PROMISE_TYPE : 'promise',
    MAP_TYPE : 'map',
    SET_TYPE : 'set',
    ITERATOR_TYPE : 'iterator',
    GENERATOR_TYPE : 'generator',
  }
  
  
  // Handle id counters.
  var next_handle_ = 0;
  var next_transient_handle_ = -1;
  
  // Mirror cache.
  var mirror_cache_ = [];
  var mirror_cache_enabled_ = true;
  
  
  function MirrorCacheIsEmpty() {
    return next_handle_ == 0 && mirror_cache_.length == 0;
  }
  
  
  function ToggleMirrorCache(value) {
    mirror_cache_enabled_ = value;
    ClearMirrorCache();
  }
  
  
  function ClearMirrorCache(value) {
    next_handle_ = 0;
    mirror_cache_ = [];
  }
  
  
  function ObjectIsPromise(value) {
    return IS_RECEIVER(value) &&
           !IS_UNDEFINED(%DebugGetProperty(value, promiseStatusSymbol));
  }
  
  
  /**
   * Returns the mirror for a specified value or object.
   *
   * @param {value or Object} value the value or object to retreive the mirror for
   * @param {boolean} transient indicate whether this object is transient and
   *    should not be added to the mirror cache. The default is not transient.
   * @returns {Mirror} the mirror reflects the passed value or object
   */
  function MakeMirror(value, opt_transient) {
    var mirror;
  
    // Look for non transient mirrors in the mirror cache.
    if (!opt_transient && mirror_cache_enabled_) {
      for (var id in mirror_cache_) {
        mirror = mirror_cache_[id];
        if (mirror.value() === value) {
          return mirror;
        }
        // Special check for NaN as NaN == NaN is false.
        if (mirror.isNumber() && IsNaN(mirror.value()) &&
            typeof value == 'number' && IsNaN(value)) {
          return mirror;
        }
      }
    }
  
    if (IS_UNDEFINED(value)) {
      mirror = new UndefinedMirror();
    } else if (IS_NULL(value)) {
      mirror = new NullMirror();
    } else if (IS_BOOLEAN(value)) {
      mirror = new BooleanMirror(value);
    } else if (IS_NUMBER(value)) {
      mirror = new NumberMirror(value);
    } else if (IS_STRING(value)) {
      mirror = new StringMirror(value);
    } else if (IS_SYMBOL(value)) {
      mirror = new SymbolMirror(value);
    } else if (IS_ARRAY(value)) {
      mirror = new ArrayMirror(value);
    } else if (IS_DATE(value)) {
      mirror = new DateMirror(value);
    } else if (IS_FUNCTION(value)) {
      mirror = new FunctionMirror(value);
    } else if (IS_REGEXP(value)) {
      mirror = new RegExpMirror(value);
    } else if (IS_ERROR(value)) {
      mirror = new ErrorMirror(value);
    } else if (IS_SCRIPT(value)) {
      mirror = new ScriptMirror(value);
    } else if (IS_MAP(value) || IS_WEAKMAP(value)) {
      mirror = new MapMirror(value);
    } else if (IS_SET(value) || IS_WEAKSET(value)) {
      mirror = new SetMirror(value);
    } else if (IS_MAP_ITERATOR(value) || IS_SET_ITERATOR(value)) {
      mirror = new IteratorMirror(value);
    } else if (ObjectIsPromise(value)) {
      mirror = new PromiseMirror(value);
    } else if (IS_GENERATOR(value)) {
      mirror = new GeneratorMirror(value);
    } else {
      mirror = new ObjectMirror(value, MirrorType.OBJECT_TYPE, opt_transient);
    }
  
    if (mirror_cache_enabled_) mirror_cache_[mirror.handle()] = mirror;
    return mirror;
  }
  
  
  /**
   * Returns the mirror for a specified mirror handle.
   *
   * @param {number} handle the handle to find the mirror for
   * @returns {Mirror or undefiend} the mirror with the requested handle or
   *     undefined if no mirror with the requested handle was found
   */
  function LookupMirror(handle) {
    if (!mirror_cache_enabled_) {
      throw MakeError(kDebugger, "Mirror cache is disabled");
    }
    return mirror_cache_[handle];
  }
  
  
  /**
   * Returns the mirror for the undefined value.
   *
   * @returns {Mirror} the mirror reflects the undefined value
   */
  function GetUndefinedMirror() {
    return MakeMirror(UNDEFINED);
  }
  
  
  /**
   * Inherit the prototype methods from one constructor into another.
   *
   * The Function.prototype.inherits from lang.js rewritten as a standalone
   * function (not on Function.prototype). NOTE: If this file is to be loaded
   * during bootstrapping this function needs to be revritten using some native
   * functions as prototype setup using normal JavaScript does not work as
   * expected during bootstrapping (see mirror.js in r114903).
   *
   * @param {function} ctor Constructor function which needs to inherit the
   *     prototype
   * @param {function} superCtor Constructor function to inherit prototype from
   */
  function inherits(ctor, superCtor) {
    var tempCtor = function(){};
    tempCtor.prototype = superCtor.prototype;
    ctor.super_ = superCtor.prototype;
    ctor.prototype = new tempCtor();
    ctor.prototype.constructor = ctor;
  }
  
  // Maximum length when sending strings through the JSON protocol.
  var kMaxProtocolStringLength = 80;
  
  
  // A copy of the PropertyType enum from property-details.h
  var PropertyType = {};
  PropertyType.Data                        = 0;
  PropertyType.DataConstant                = 2;
  PropertyType.AccessorConstant            = 3;
  
  
  // Different attributes for a property.
  var PropertyAttribute = {};
  PropertyAttribute.None       = NONE;
  PropertyAttribute.ReadOnly   = READ_ONLY;
  PropertyAttribute.DontEnum   = DONT_ENUM;
  PropertyAttribute.DontDelete = DONT_DELETE;
  
  
  // A copy of the scope types from runtime-debug.cc.
  // NOTE: these constants should be backward-compatible, so
  // add new ones to the end of this list.
  var ScopeType = { Global: 0,
                    Local: 1,
                    With: 2,
                    Closure: 3,
                    Catch: 4,
                    Block: 5,
                    Script: 6 };
  
  /**
   * Base class for all mirror objects.
   * @param {string} type The type of the mirror
   * @constructor
   */
  function Mirror(type) {
    this.type_ = type;
  }
  
  
  Mirror.prototype.type = function() {
    return this.type_;
  };
  
  
  /**
   * Check whether the mirror reflects a value.
   * @returns {boolean} True if the mirror reflects a value.
   */
  Mirror.prototype.isValue = function() {
    return this instanceof ValueMirror;
  };
  
  
  /**
   * Check whether the mirror reflects the undefined value.
   * @returns {boolean} True if the mirror reflects the undefined value.
   */
  Mirror.prototype.isUndefined = function() {
    return this instanceof UndefinedMirror;
  };
  
  
  /**
   * Check whether the mirror reflects the null value.
   * @returns {boolean} True if the mirror reflects the null value
   */
  Mirror.prototype.isNull = function() {
    return this instanceof NullMirror;
  };
  
  
  /**
   * Check whether the mirror reflects a boolean value.
   * @returns {boolean} True if the mirror reflects a boolean value
   */
  Mirror.prototype.isBoolean = function() {
    return this instanceof BooleanMirror;
  };
  
  
  /**
   * Check whether the mirror reflects a number value.
   * @returns {boolean} True if the mirror reflects a number value
   */
  Mirror.prototype.isNumber = function() {
    return this instanceof NumberMirror;
  };
  
  
  /**
   * Check whether the mirror reflects a string value.
   * @returns {boolean} True if the mirror reflects a string value
   */
  Mirror.prototype.isString = function() {
    return this instanceof StringMirror;
  };
  
  
  /**
   * Check whether the mirror reflects a symbol.
   * @returns {boolean} True if the mirror reflects a symbol
   */
  Mirror.prototype.isSymbol = function() {
    return this instanceof SymbolMirror;
  };
  
  
  /**
   * Check whether the mirror reflects an object.
   * @returns {boolean} True if the mirror reflects an object
   */
  Mirror.prototype.isObject = function() {
    return this instanceof ObjectMirror;
  };
  
  
  /**
   * Check whether the mirror reflects a function.
   * @returns {boolean} True if the mirror reflects a function
   */
  Mirror.prototype.isFunction = function() {
    return this instanceof FunctionMirror;
  };
  
  
  /**
   * Check whether the mirror reflects an unresolved function.
   * @returns {boolean} True if the mirror reflects an unresolved function
   */
  Mirror.prototype.isUnresolvedFunction = function() {
    return this instanceof UnresolvedFunctionMirror;
  };
  
  
  /**
   * Check whether the mirror reflects an array.
   * @returns {boolean} True if the mirror reflects an array
   */
  Mirror.prototype.isArray = function() {
    return this instanceof ArrayMirror;
  };
  
  
  /**
   * Check whether the mirror reflects a date.
   * @returns {boolean} True if the mirror reflects a date
   */
  Mirror.prototype.isDate = function() {
    return this instanceof DateMirror;
  };
  
  
  /**
   * Check whether the mirror reflects a regular expression.
   * @returns {boolean} True if the mirror reflects a regular expression
   */
  Mirror.prototype.isRegExp = function() {
    return this instanceof RegExpMirror;
  };
  
  
  /**
   * Check whether the mirror reflects an error.
   * @returns {boolean} True if the mirror reflects an error
   */
  Mirror.prototype.isError = function() {
    return this instanceof ErrorMirror;
  };
  
  
  /**
   * Check whether the mirror reflects a promise.
   * @returns {boolean} True if the mirror reflects a promise
   */
  Mirror.prototype.isPromise = function() {
    return this instanceof PromiseMirror;
  };
  
  
  /**
   * Check whether the mirror reflects a generator object.
   * @returns {boolean} True if the mirror reflects a generator object
   */
  Mirror.prototype.isGenerator = function() {
    return this instanceof GeneratorMirror;
  };
  
  
  /**
   * Check whether the mirror reflects a property.
   * @returns {boolean} True if the mirror reflects a property
   */
  Mirror.prototype.isProperty = function() {
    return this instanceof PropertyMirror;
  };
  
  
  /**
   * Check whether the mirror reflects an internal property.
   * @returns {boolean} True if the mirror reflects an internal property
   */
  Mirror.prototype.isInternalProperty = function() {
    return this instanceof InternalPropertyMirror;
  };
  
  
  /**
   * Check whether the mirror reflects a stack frame.
   * @returns {boolean} True if the mirror reflects a stack frame
   */
  Mirror.prototype.isFrame = function() {
    return this instanceof FrameMirror;
  };
  
  
  /**
   * Check whether the mirror reflects a script.
   * @returns {boolean} True if the mirror reflects a script
   */
  Mirror.prototype.isScript = function() {
    return this instanceof ScriptMirror;
  };
  
  
  /**
   * Check whether the mirror reflects a context.
   * @returns {boolean} True if the mirror reflects a context
   */
  Mirror.prototype.isContext = function() {
    return this instanceof ContextMirror;
  };
  
  
  /**
   * Check whether the mirror reflects a scope.
   * @returns {boolean} True if the mirror reflects a scope
   */
  Mirror.prototype.isScope = function() {
    return this instanceof ScopeMirror;
  };
  
  
  /**
   * Check whether the mirror reflects a map.
   * @returns {boolean} True if the mirror reflects a map
   */
  Mirror.prototype.isMap = function() {
    return this instanceof MapMirror;
  };
  
  
  /**
   * Check whether the mirror reflects a set.
   * @returns {boolean} True if the mirror reflects a set
   */
  Mirror.prototype.isSet = function() {
    return this instanceof SetMirror;
  };
  
  
  /**
   * Check whether the mirror reflects an iterator.
   * @returns {boolean} True if the mirror reflects an iterator
   */
  Mirror.prototype.isIterator = function() {
    return this instanceof IteratorMirror;
  };
  
  
  /**
   * Allocate a handle id for this object.
   */
  Mirror.prototype.allocateHandle_ = function() {
    if (mirror_cache_enabled_) this.handle_ = next_handle_++;
  };
  
  
  /**
   * Allocate a transient handle id for this object. Transient handles are
   * negative.
   */
  Mirror.prototype.allocateTransientHandle_ = function() {
    this.handle_ = next_transient_handle_--;
  };
  
  
  Mirror.prototype.toText = function() {
    // Simpel to text which is used when on specialization in subclass.
    return "#<" + this.constructor.name + ">";
  };
  
  
  /**
   * Base class for all value mirror objects.
   * @param {string} type The type of the mirror
   * @param {value} value The value reflected by this mirror
   * @param {boolean} transient indicate whether this object is transient with a
   *    transient handle
   * @constructor
   * @extends Mirror
   */
  function ValueMirror(type, value, transient) {
    %_Call(Mirror, this, type);
    this.value_ = value;
    if (!transient) {
      this.allocateHandle_();
    } else {
      this.allocateTransientHandle_();
    }
  }
  inherits(ValueMirror, Mirror);
  
  
  Mirror.prototype.handle = function() {
    return this.handle_;
  };
  
  
  /**
   * Check whether this is a primitive value.
   * @return {boolean} True if the mirror reflects a primitive value
   */
  ValueMirror.prototype.isPrimitive = function() {
    var type = this.type();
    return type === 'undefined' ||
           type === 'null' ||
           type === 'boolean' ||
           type === 'number' ||
           type === 'string' ||
           type === 'symbol';
  };
  
  
  /**
   * Get the actual value reflected by this mirror.
   * @return {value} The value reflected by this mirror
   */
  ValueMirror.prototype.value = function() {
    return this.value_;
  };
  
  
  /**
   * Mirror object for Undefined.
   * @constructor
   * @extends ValueMirror
   */
  function UndefinedMirror() {
    %_Call(ValueMirror, this, MirrorType.UNDEFINED_TYPE, UNDEFINED);
  }
  inherits(UndefinedMirror, ValueMirror);
  
  
  UndefinedMirror.prototype.toText = function() {
    return 'undefined';
  };
  
  
  /**
   * Mirror object for null.
   * @constructor
   * @extends ValueMirror
   */
  function NullMirror() {
    %_Call(ValueMirror, this, MirrorType.NULL_TYPE, null);
  }
  inherits(NullMirror, ValueMirror);
  
  
  NullMirror.prototype.toText = function() {
    return 'null';
  };
  
  
  /**
   * Mirror object for boolean values.
   * @param {boolean} value The boolean value reflected by this mirror
   * @constructor
   * @extends ValueMirror
   */
  function BooleanMirror(value) {
    %_Call(ValueMirror, this, MirrorType.BOOLEAN_TYPE, value);
  }
  inherits(BooleanMirror, ValueMirror);
  
  
  BooleanMirror.prototype.toText = function() {
    return this.value_ ? 'true' : 'false';
  };
  
  
  /**
   * Mirror object for number values.
   * @param {number} value The number value reflected by this mirror
   * @constructor
   * @extends ValueMirror
   */
  function NumberMirror(value) {
    %_Call(ValueMirror, this, MirrorType.NUMBER_TYPE, value);
  }
  inherits(NumberMirror, ValueMirror);
  
  
  NumberMirror.prototype.toText = function() {
    return %_NumberToString(this.value_);
  };
  
  
  /**
   * Mirror object for string values.
   * @param {string} value The string value reflected by this mirror
   * @constructor
   * @extends ValueMirror
   */
  function StringMirror(value) {
    %_Call(ValueMirror, this, MirrorType.STRING_TYPE, value);
  }
  inherits(StringMirror, ValueMirror);
  
  
  StringMirror.prototype.length = function() {
    return this.value_.length;
  };
  
  StringMirror.prototype.getTruncatedValue = function(maxLength) {
    if (maxLength != -1 && this.length() > maxLength) {
      return this.value_.substring(0, maxLength) +
             '... (length: ' + this.length() + ')';
    }
    return this.value_;
  };
  
  StringMirror.prototype.toText = function() {
    return this.getTruncatedValue(kMaxProtocolStringLength);
  };
  
  
  /**
   * Mirror object for a Symbol
   * @param {Object} value The Symbol
   * @constructor
   * @extends Mirror
   */
  function SymbolMirror(value) {
    %_Call(ValueMirror, this, MirrorType.SYMBOL_TYPE, value);
  }
  inherits(SymbolMirror, ValueMirror);
  
  
  SymbolMirror.prototype.description = function() {
    return %SymbolDescription(%_ValueOf(this.value_));
  }
  
  
  SymbolMirror.prototype.toText = function() {
    return %_Call(SymbolToString, this.value_);
  }
  
  
  /**
   * Mirror object for objects.
   * @param {object} value The object reflected by this mirror
   * @param {boolean} transient indicate whether this object is transient with a
   *    transient handle
   * @constructor
   * @extends ValueMirror
   */
  function ObjectMirror(value, type, transient) {
    type = type || MirrorType.OBJECT_TYPE;
    %_Call(ValueMirror, this, type, value, transient);
  }
  inherits(ObjectMirror, ValueMirror);
  
  
  ObjectMirror.prototype.className = function() {
    return %_ClassOf(this.value_);
  };
  
  
  ObjectMirror.prototype.constructorFunction = function() {
    return MakeMirror(%DebugGetProperty(this.value_, 'constructor'));
  };
  
  
  ObjectMirror.prototype.prototypeObject = function() {
    return MakeMirror(%DebugGetProperty(this.value_, 'prototype'));
  };
  
  
  ObjectMirror.prototype.protoObject = function() {
    return MakeMirror(%DebugGetPrototype(this.value_));
  };
  
  
  ObjectMirror.prototype.hasNamedInterceptor = function() {
    // Get information on interceptors for this object.
    var x = %GetInterceptorInfo(this.value_);
    return (x & 2) != 0;
  };
  
  
  ObjectMirror.prototype.hasIndexedInterceptor = function() {
    // Get information on interceptors for this object.
    var x = %GetInterceptorInfo(this.value_);
    return (x & 1) != 0;
  };
  
  
  /**
   * Return the property names for this object.
   * @param {number} kind Indicate whether named, indexed or both kinds of
   *     properties are requested
   * @param {number} limit Limit the number of names returend to the specified
         value
   * @return {Array} Property names for this object
   */
  ObjectMirror.prototype.propertyNames = function() {
    return %GetOwnPropertyKeys(this.value_, PROPERTY_FILTER_NONE);
  };
  
  
  /**
   * Return the properties for this object as an array of PropertyMirror objects.
   * @param {number} kind Indicate whether named, indexed or both kinds of
   *     properties are requested
   * @param {number} limit Limit the number of properties returned to the
         specified value
   * @return {Array} Property mirrors for this object
   */
  ObjectMirror.prototype.properties = function() {
    var names = this.propertyNames();
    var properties = new GlobalArray(names.length);
    for (var i = 0; i < names.length; i++) {
      properties[i] = this.property(names[i]);
    }
  
    return properties;
  };
  
  
  /**
   * Return the internal properties for this object as an array of
   * InternalPropertyMirror objects.
   * @return {Array} Property mirrors for this object
   */
  ObjectMirror.prototype.internalProperties = function() {
    return ObjectMirror.GetInternalProperties(this.value_);
  }
  
  
  ObjectMirror.prototype.property = function(name) {
    var details = %DebugGetPropertyDetails(this.value_, TO_NAME(name));
    if (details) {
      return new PropertyMirror(this, name, details);
    }
  
    // Nothing found.
    return GetUndefinedMirror();
  };
  
  
  
  /**
   * Try to find a property from its value.
   * @param {Mirror} value The property value to look for
   * @return {PropertyMirror} The property with the specified value. If no
   *     property was found with the specified value UndefinedMirror is returned
   */
  ObjectMirror.prototype.lookupProperty = function(value) {
    var properties = this.properties();
  
    // Look for property value in properties.
    for (var i = 0; i < properties.length; i++) {
  
      // Skip properties which are defined through accessors.
      var property = properties[i];
      if (property.propertyType() != PropertyType.AccessorConstant) {
        if (property.value_ === value.value_) {
          return property;
        }
      }
    }
  
    // Nothing found.
    return GetUndefinedMirror();
  };
  
  
  /**
   * Returns objects which has direct references to this object
   * @param {number} opt_max_objects Optional parameter specifying the maximum
   *     number of referencing objects to return.
   * @return {Array} The objects which has direct references to this object.
   */
  ObjectMirror.prototype.referencedBy = function(opt_max_objects) {
    // Find all objects with direct references to this object.
    var result = %DebugReferencedBy(this.value_,
                                    Mirror.prototype, opt_max_objects || 0);
  
    // Make mirrors for all the references found.
    for (var i = 0; i < result.length; i++) {
      result[i] = MakeMirror(result[i]);
    }
  
    return result;
  };
  
  
  ObjectMirror.prototype.toText = function() {
    var name;
    var ctor = this.constructorFunction();
    if (!ctor.isFunction()) {
      name = this.className();
    } else {
      name = ctor.name();
      if (!name) {
        name = this.className();
      }
    }
    return '#<' + name + '>';
  };
  
  
  /**
   * Return the internal properties of the value, such as [[PrimitiveValue]] of
   * scalar wrapper objects, properties of the bound function and properties of
   * the promise.
   * This method is done static to be accessible from Debug API with the bare
   * values without mirrors.
   * @return {Array} array (possibly empty) of InternalProperty instances
   */
  ObjectMirror.GetInternalProperties = function(value) {
    var properties = %DebugGetInternalProperties(value);
    var result = [];
    for (var i = 0; i < properties.length; i += 2) {
      result.push(new InternalPropertyMirror(properties[i], properties[i + 1]));
    }
    return result;
  }
  
  
  /**
   * Mirror object for functions.
   * @param {function} value The function object reflected by this mirror.
   * @constructor
   * @extends ObjectMirror
   */
  function FunctionMirror(value) {
    %_Call(ObjectMirror, this, value, MirrorType.FUNCTION_TYPE);
    this.resolved_ = true;
  }
  inherits(FunctionMirror, ObjectMirror);
  
  
  /**
   * Returns whether the function is resolved.
   * @return {boolean} True if the function is resolved. Unresolved functions can
   *     only originate as functions from stack frames
   */
  FunctionMirror.prototype.resolved = function() {
    return this.resolved_;
  };
  
  
  /**
   * Returns the name of the function.
   * @return {string} Name of the function
   */
  FunctionMirror.prototype.name = function() {
    return %FunctionGetName(this.value_);
  };
  
  
  /**
   * Returns the displayName if it is set, otherwise name, otherwise inferred
   * name.
   * @return {string} Name of the function
   */
  FunctionMirror.prototype.debugName = function() {
    return %FunctionGetDebugName(this.value_);
  }
  
  
  /**
   * Returns the inferred name of the function.
   * @return {string} Name of the function
   */
  FunctionMirror.prototype.inferredName = function() {
    return %FunctionGetInferredName(this.value_);
  };
  
  
  /**
   * Returns the source code for the function.
   * @return {string or undefined} The source code for the function. If the
   *     function is not resolved undefined will be returned.
   */
  FunctionMirror.prototype.source = function() {
    // Return source if function is resolved. Otherwise just fall through to
    // return undefined.
    if (this.resolved()) {
      return %FunctionToString(this.value_);
    }
  };
  
  
  /**
   * Returns the script object for the function.
   * @return {ScriptMirror or undefined} Script object for the function or
   *     undefined if the function has no script
   */
  FunctionMirror.prototype.script = function() {
    // Return script if function is resolved. Otherwise just fall through
    // to return undefined.
    if (this.resolved()) {
      if (this.script_) {
        return this.script_;
      }
      var script = %FunctionGetScript(this.value_);
      if (script) {
        return this.script_ = MakeMirror(script);
      }
    }
  };
  
  
  /**
   * Returns the script source position for the function. Only makes sense
   * for functions which has a script defined.
   * @return {Number or undefined} in-script position for the function
   */
  FunctionMirror.prototype.sourcePosition_ = function() {
    // Return position if function is resolved. Otherwise just fall
    // through to return undefined.
    if (this.resolved()) {
      return %FunctionGetScriptSourcePosition(this.value_);
    }
  };
  
  
  /**
   * Returns the script source location object for the function. Only makes sense
   * for functions which has a script defined.
   * @return {Location or undefined} in-script location for the function begin
   */
  FunctionMirror.prototype.sourceLocation = function() {
    if (this.resolved()) {
      var script = this.script();
      if (script) {
        return script.locationFromPosition(this.sourcePosition_(), true);
      }
    }
  };
  
  
  /**
   * Returns objects constructed by this function.
   * @param {number} opt_max_instances Optional parameter specifying the maximum
   *     number of instances to return.
   * @return {Array or undefined} The objects constructed by this function.
   */
  FunctionMirror.prototype.constructedBy = function(opt_max_instances) {
    if (this.resolved()) {
      // Find all objects constructed from this function.
      var result = %DebugConstructedBy(this.value_, opt_max_instances || 0);
  
      // Make mirrors for all the instances found.
      for (var i = 0; i < result.length; i++) {
        result[i] = MakeMirror(result[i]);
      }
  
      return result;
    } else {
      return [];
    }
  };
  
  
  FunctionMirror.prototype.scopeCount = function() {
    if (this.resolved()) {
      if (IS_UNDEFINED(this.scopeCount_)) {
        this.scopeCount_ = %GetFunctionScopeCount(this.value());
      }
      return this.scopeCount_;
    } else {
      return 0;
    }
  };
  
  
  FunctionMirror.prototype.scope = function(index) {
    if (this.resolved()) {
      return new ScopeMirror(UNDEFINED, this, index);
    }
  };
  
  
  FunctionMirror.prototype.toText = function() {
    return this.source();
  };
  
  
  /**
   * Mirror object for unresolved functions.
   * @param {string} value The name for the unresolved function reflected by this
   *     mirror.
   * @constructor
   * @extends ObjectMirror
   */
  function UnresolvedFunctionMirror(value) {
    // Construct this using the ValueMirror as an unresolved function is not a
    // real object but just a string.
    %_Call(ValueMirror, this, MirrorType.FUNCTION_TYPE, value);
    this.propertyCount_ = 0;
    this.elementCount_ = 0;
    this.resolved_ = false;
  }
  inherits(UnresolvedFunctionMirror, FunctionMirror);
  
  
  UnresolvedFunctionMirror.prototype.className = function() {
    return 'Function';
  };
  
  
  UnresolvedFunctionMirror.prototype.constructorFunction = function() {
    return GetUndefinedMirror();
  };
  
  
  UnresolvedFunctionMirror.prototype.prototypeObject = function() {
    return GetUndefinedMirror();
  };
  
  
  UnresolvedFunctionMirror.prototype.protoObject = function() {
    return GetUndefinedMirror();
  };
  
  
  UnresolvedFunctionMirror.prototype.name = function() {
    return this.value_;
  };
  
  
  UnresolvedFunctionMirror.prototype.inferredName = function() {
    return UNDEFINED;
  };
  
  
  UnresolvedFunctionMirror.prototype.propertyNames = function(kind, limit) {
    return [];
  };
  
  
  /**
   * Mirror object for arrays.
   * @param {Array} value The Array object reflected by this mirror
   * @constructor
   * @extends ObjectMirror
   */
  function ArrayMirror(value) {
    %_Call(ObjectMirror, this, value);
  }
  inherits(ArrayMirror, ObjectMirror);
  
  
  ArrayMirror.prototype.length = function() {
    return this.value_.length;
  };
  
  
  ArrayMirror.prototype.indexedPropertiesFromRange = function(opt_from_index,
                                                              opt_to_index) {
    var from_index = opt_from_index || 0;
    var to_index = opt_to_index || this.length() - 1;
    if (from_index > to_index) return new GlobalArray();
    var values = new GlobalArray(to_index - from_index + 1);
    for (var i = from_index; i <= to_index; i++) {
      var details = %DebugGetPropertyDetails(this.value_, TO_STRING(i));
      var value;
      if (details) {
        value = new PropertyMirror(this, i, details);
      } else {
        value = GetUndefinedMirror();
      }
      values[i - from_index] = value;
    }
    return values;
  };
  
  
  /**
   * Mirror object for dates.
   * @param {Date} value The Date object reflected by this mirror
   * @constructor
   * @extends ObjectMirror
   */
  function DateMirror(value) {
    %_Call(ObjectMirror, this, value);
  }
  inherits(DateMirror, ObjectMirror);
  
  
  DateMirror.prototype.toText = function() {
    var s = JSONStringify(this.value_);
    return s.substring(1, s.length - 1);  // cut quotes
  };
  
  
  /**
   * Mirror object for regular expressions.
   * @param {RegExp} value The RegExp object reflected by this mirror
   * @constructor
   * @extends ObjectMirror
   */
  function RegExpMirror(value) {
    %_Call(ObjectMirror, this, value, MirrorType.REGEXP_TYPE);
  }
  inherits(RegExpMirror, ObjectMirror);
  
  
  /**
   * Returns the source to the regular expression.
   * @return {string or undefined} The source to the regular expression
   */
  RegExpMirror.prototype.source = function() {
    return this.value_.source;
  };
  
  
  /**
   * Returns whether this regular expression has the global (g) flag set.
   * @return {boolean} Value of the global flag
   */
  RegExpMirror.prototype.global = function() {
    return this.value_.global;
  };
  
  
  /**
   * Returns whether this regular expression has the ignore case (i) flag set.
   * @return {boolean} Value of the ignore case flag
   */
  RegExpMirror.prototype.ignoreCase = function() {
    return this.value_.ignoreCase;
  };
  
  
  /**
   * Returns whether this regular expression has the multiline (m) flag set.
   * @return {boolean} Value of the multiline flag
   */
  RegExpMirror.prototype.multiline = function() {
    return this.value_.multiline;
  };
  
  
  /**
   * Returns whether this regular expression has the sticky (y) flag set.
   * @return {boolean} Value of the sticky flag
   */
  RegExpMirror.prototype.sticky = function() {
    return this.value_.sticky;
  };
  
  
  /**
   * Returns whether this regular expression has the unicode (u) flag set.
   * @return {boolean} Value of the unicode flag
   */
  RegExpMirror.prototype.unicode = function() {
    return this.value_.unicode;
  };
  
  
  RegExpMirror.prototype.toText = function() {
    // Simpel to text which is used when on specialization in subclass.
    return "/" + this.source() + "/";
  };
  
  
  /**
   * Mirror object for error objects.
   * @param {Error} value The error object reflected by this mirror
   * @constructor
   * @extends ObjectMirror
   */
  function ErrorMirror(value) {
    %_Call(ObjectMirror, this, value, MirrorType.ERROR_TYPE);
  }
  inherits(ErrorMirror, ObjectMirror);
  
  
  /**
   * Returns the message for this eror object.
   * @return {string or undefined} The message for this eror object
   */
  ErrorMirror.prototype.message = function() {
    return this.value_.message;
  };
  
  
  ErrorMirror.prototype.toText = function() {
    // Use the same text representation as in messages.js.
    var text;
    try {
      text = %_Call(ErrorToString, this.value_);
    } catch (e) {
      text = '#<Error>';
    }
    return text;
  };
  
  
  /**
   * Mirror object for a Promise object.
   * @param {Object} value The Promise object
   * @constructor
   * @extends ObjectMirror
   */
  function PromiseMirror(value) {
    %_Call(ObjectMirror, this, value, MirrorType.PROMISE_TYPE);
  }
  inherits(PromiseMirror, ObjectMirror);
  
  
  function PromiseGetStatus_(value) {
    var status = %DebugGetProperty(value, promiseStatusSymbol);
    if (status == 0) return "pending";
    if (status == 1) return "resolved";
    return "rejected";
  }
  
  
  function PromiseGetValue_(value) {
    return %DebugGetProperty(value, promiseValueSymbol);
  }
  
  
  PromiseMirror.prototype.status = function() {
    return PromiseGetStatus_(this.value_);
  };
  
  
  PromiseMirror.prototype.promiseValue = function() {
    return MakeMirror(PromiseGetValue_(this.value_));
  };
  
  
  function MapMirror(value) {
    %_Call(ObjectMirror, this, value, MirrorType.MAP_TYPE);
  }
  inherits(MapMirror, ObjectMirror);
  
  
  /**
   * Returns an array of key/value pairs of a map.
   * This will keep keys alive for WeakMaps.
   *
   * @param {number=} opt_limit Max elements to return.
   * @returns {Array.<Object>} Array of key/value pairs of a map.
   */
  MapMirror.prototype.entries = function(opt_limit) {
    var result = [];
  
    if (IS_WEAKMAP(this.value_)) {
      var entries = %GetWeakMapEntries(this.value_, opt_limit || 0);
      for (var i = 0; i < entries.length; i += 2) {
        result.push({
          key: entries[i],
          value: entries[i + 1]
        });
      }
      return result;
    }
  
    var iter = %_Call(MapEntries, this.value_);
    var next;
    while ((!opt_limit || result.length < opt_limit) &&
           !(next = iter.next()).done) {
      result.push({
        key: next.value[0],
        value: next.value[1]
      });
    }
    return result;
  };
  
  
  function SetMirror(value) {
    %_Call(ObjectMirror, this, value, MirrorType.SET_TYPE);
  }
  inherits(SetMirror, ObjectMirror);
  
  
  function IteratorGetValues_(iter, next_function, opt_limit) {
    var result = [];
    var next;
    while ((!opt_limit || result.length < opt_limit) &&
           !(next = %_Call(next_function, iter)).done) {
      result.push(next.value);
    }
    return result;
  }
  
  
  /**
   * Returns an array of elements of a set.
   * This will keep elements alive for WeakSets.
   *
   * @param {number=} opt_limit Max elements to return.
   * @returns {Array.<Object>} Array of elements of a set.
   */
  SetMirror.prototype.values = function(opt_limit) {
    if (IS_WEAKSET(this.value_)) {
      return %GetWeakSetValues(this.value_, opt_limit || 0);
    }
  
    var iter = %_Call(SetValues, this.value_);
    return IteratorGetValues_(iter, SetIteratorNext, opt_limit);
  };
  
  
  function IteratorMirror(value) {
    %_Call(ObjectMirror, this, value, MirrorType.ITERATOR_TYPE);
  }
  inherits(IteratorMirror, ObjectMirror);
  
  
  /**
   * Returns a preview of elements of an iterator.
   * Does not change the backing iterator state.
   *
   * @param {number=} opt_limit Max elements to return.
   * @returns {Array.<Object>} Array of elements of an iterator.
   */
  IteratorMirror.prototype.preview = function(opt_limit) {
    if (IS_MAP_ITERATOR(this.value_)) {
      return IteratorGetValues_(%MapIteratorClone(this.value_),
                                MapIteratorNext,
                                opt_limit);
    } else if (IS_SET_ITERATOR(this.value_)) {
      return IteratorGetValues_(%SetIteratorClone(this.value_),
                                SetIteratorNext,
                                opt_limit);
    }
  };
  
  
  /**
   * Mirror object for a Generator object.
   * @param {Object} data The Generator object
   * @constructor
   * @extends Mirror
   */
  function GeneratorMirror(value) {
    %_Call(ObjectMirror, this, value, MirrorType.GENERATOR_TYPE);
  }
  inherits(GeneratorMirror, ObjectMirror);
  
  
  function GeneratorGetStatus_(value) {
    var continuation = %GeneratorGetContinuation(value);
    if (continuation < 0) return "running";
    if (continuation == 0) return "closed";
    return "suspended";
  }
  
  
  GeneratorMirror.prototype.status = function() {
    return GeneratorGetStatus_(this.value_);
  };
  
  
  GeneratorMirror.prototype.sourcePosition_ = function() {
    return %GeneratorGetSourcePosition(this.value_);
  };
  
  
  GeneratorMirror.prototype.sourceLocation = function() {
    var pos = this.sourcePosition_();
    if (!IS_UNDEFINED(pos)) {
      var script = this.func().script();
      if (script) {
        return script.locationFromPosition(pos, true);
      }
    }
  };
  
  
  GeneratorMirror.prototype.func = function() {
    if (!this.func_) {
      this.func_ = MakeMirror(%GeneratorGetFunction(this.value_));
    }
    return this.func_;
  };
  
  
  GeneratorMirror.prototype.context = function() {
    if (!this.context_) {
      this.context_ = new ContextMirror(%GeneratorGetContext(this.value_));
    }
    return this.context_;
  };
  
  
  GeneratorMirror.prototype.receiver = function() {
    if (!this.receiver_) {
      this.receiver_ = MakeMirror(%GeneratorGetReceiver(this.value_));
    }
    return this.receiver_;
  };
  
  
  /**
   * Base mirror object for properties.
   * @param {ObjectMirror} mirror The mirror object having this property
   * @param {string} name The name of the property
   * @param {Array} details Details about the property
   * @constructor
   * @extends Mirror
   */
  function PropertyMirror(mirror, name, details) {
    %_Call(Mirror, this, MirrorType.PROPERTY_TYPE);
    this.mirror_ = mirror;
    this.name_ = name;
    this.value_ = details[0];
    this.details_ = details[1];
    this.is_interceptor_ = details[2];
    if (details.length > 3) {
      this.exception_ = details[3];
      this.getter_ = details[4];
      this.setter_ = details[5];
    }
  }
  inherits(PropertyMirror, Mirror);
  
  
  PropertyMirror.prototype.isReadOnly = function() {
    return (this.attributes() & PropertyAttribute.ReadOnly) != 0;
  };
  
  
  PropertyMirror.prototype.isEnum = function() {
    return (this.attributes() & PropertyAttribute.DontEnum) == 0;
  };
  
  
  PropertyMirror.prototype.canDelete = function() {
    return (this.attributes() & PropertyAttribute.DontDelete) == 0;
  };
  
  
  PropertyMirror.prototype.name = function() {
    return this.name_;
  };
  
  
  PropertyMirror.prototype.isIndexed = function() {
    for (var i = 0; i < this.name_.length; i++) {
      if (this.name_[i] < '0' || '9' < this.name_[i]) {
        return false;
      }
    }
    return true;
  };
  
  
  PropertyMirror.prototype.value = function() {
    return MakeMirror(this.value_, false);
  };
  
  
  /**
   * Returns whether this property value is an exception.
   * @return {booolean} True if this property value is an exception
   */
  PropertyMirror.prototype.isException = function() {
    return this.exception_ ? true : false;
  };
  
  
  PropertyMirror.prototype.attributes = function() {
    return %DebugPropertyAttributesFromDetails(this.details_);
  };
  
  
  PropertyMirror.prototype.propertyType = function() {
    return %DebugPropertyTypeFromDetails(this.details_);
  };
  
  
  PropertyMirror.prototype.insertionIndex = function() {
    return %DebugPropertyIndexFromDetails(this.details_);
  };
  
  
  /**
   * Returns whether this property has a getter defined through __defineGetter__.
   * @return {booolean} True if this property has a getter
   */
  PropertyMirror.prototype.hasGetter = function() {
    return this.getter_ ? true : false;
  };
  
  
  /**
   * Returns whether this property has a setter defined through __defineSetter__.
   * @return {booolean} True if this property has a setter
   */
  PropertyMirror.prototype.hasSetter = function() {
    return this.setter_ ? true : false;
  };
  
  
  /**
   * Returns the getter for this property defined through __defineGetter__.
   * @return {Mirror} FunctionMirror reflecting the getter function or
   *     UndefinedMirror if there is no getter for this property
   */
  PropertyMirror.prototype.getter = function() {
    if (this.hasGetter()) {
      return MakeMirror(this.getter_);
    } else {
      return GetUndefinedMirror();
    }
  };
  
  
  /**
   * Returns the setter for this property defined through __defineSetter__.
   * @return {Mirror} FunctionMirror reflecting the setter function or
   *     UndefinedMirror if there is no setter for this property
   */
  PropertyMirror.prototype.setter = function() {
    if (this.hasSetter()) {
      return MakeMirror(this.setter_);
    } else {
      return GetUndefinedMirror();
    }
  };
  
  
  /**
   * Returns whether this property is natively implemented by the host or a set
   * through JavaScript code.
   * @return {boolean} True if the property is
   *     UndefinedMirror if there is no setter for this property
   */
  PropertyMirror.prototype.isNative = function() {
    return this.is_interceptor_ ||
           ((this.propertyType() == PropertyType.AccessorConstant) &&
            !this.hasGetter() && !this.hasSetter());
  };
  
  
  /**
   * Mirror object for internal properties. Internal property reflects properties
   * not accessible from user code such as [[BoundThis]] in bound function.
   * Their names are merely symbolic.
   * @param {string} name The name of the property
   * @param {value} property value
   * @constructor
   * @extends Mirror
   */
  function InternalPropertyMirror(name, value) {
    %_Call(Mirror, this, MirrorType.INTERNAL_PROPERTY_TYPE);
    this.name_ = name;
    this.value_ = value;
  }
  inherits(InternalPropertyMirror, Mirror);
  
  
  InternalPropertyMirror.prototype.name = function() {
    return this.name_;
  };
  
  
  InternalPropertyMirror.prototype.value = function() {
    return MakeMirror(this.value_, false);
  };
  
  
  var kFrameDetailsFrameIdIndex = 0;
  var kFrameDetailsReceiverIndex = 1;
  var kFrameDetailsFunctionIndex = 2;
  var kFrameDetailsArgumentCountIndex = 3;
  var kFrameDetailsLocalCountIndex = 4;
  var kFrameDetailsSourcePositionIndex = 5;
  var kFrameDetailsConstructCallIndex = 6;
  var kFrameDetailsAtReturnIndex = 7;
  var kFrameDetailsFlagsIndex = 8;
  var kFrameDetailsFirstDynamicIndex = 9;
  
  var kFrameDetailsNameIndex = 0;
  var kFrameDetailsValueIndex = 1;
  var kFrameDetailsNameValueSize = 2;
  
  var kFrameDetailsFlagDebuggerFrameMask = 1 << 0;
  var kFrameDetailsFlagOptimizedFrameMask = 1 << 1;
  var kFrameDetailsFlagInlinedFrameIndexMask = 7 << 2;
  
  /**
   * Wrapper for the frame details information retreived from the VM. The frame
   * details from the VM is an array with the following content. See runtime.cc
   * Runtime_GetFrameDetails.
   *     0: Id
   *     1: Receiver
   *     2: Function
   *     3: Argument count
   *     4: Local count
   *     5: Source position
   *     6: Construct call
   *     7: Is at return
   *     8: Flags (debugger frame, optimized frame, inlined frame index)
   *     Arguments name, value
   *     Locals name, value
   *     Return value if any
   * @param {number} break_id Current break id
   * @param {number} index Frame number
   * @constructor
   */
  function FrameDetails(break_id, index) {
    this.break_id_ = break_id;
    this.details_ = %GetFrameDetails(break_id, index);
  }
  
  
  FrameDetails.prototype.frameId = function() {
    %CheckExecutionState(this.break_id_);
    return this.details_[kFrameDetailsFrameIdIndex];
  };
  
  
  FrameDetails.prototype.receiver = function() {
    %CheckExecutionState(this.break_id_);
    return this.details_[kFrameDetailsReceiverIndex];
  };
  
  
  FrameDetails.prototype.func = function() {
    %CheckExecutionState(this.break_id_);
    return this.details_[kFrameDetailsFunctionIndex];
  };
  
  
  FrameDetails.prototype.isConstructCall = function() {
    %CheckExecutionState(this.break_id_);
    return this.details_[kFrameDetailsConstructCallIndex];
  };
  
  
  FrameDetails.prototype.isAtReturn = function() {
    %CheckExecutionState(this.break_id_);
    return this.details_[kFrameDetailsAtReturnIndex];
  };
  
  
  FrameDetails.prototype.isDebuggerFrame = function() {
    %CheckExecutionState(this.break_id_);
    var f = kFrameDetailsFlagDebuggerFrameMask;
    return (this.details_[kFrameDetailsFlagsIndex] & f) == f;
  };
  
  
  FrameDetails.prototype.isOptimizedFrame = function() {
    %CheckExecutionState(this.break_id_);
    var f = kFrameDetailsFlagOptimizedFrameMask;
    return (this.details_[kFrameDetailsFlagsIndex] & f) == f;
  };
  
  
  FrameDetails.prototype.isInlinedFrame = function() {
    return this.inlinedFrameIndex() > 0;
  };
  
  
  FrameDetails.prototype.inlinedFrameIndex = function() {
    %CheckExecutionState(this.break_id_);
    var f = kFrameDetailsFlagInlinedFrameIndexMask;
    return (this.details_[kFrameDetailsFlagsIndex] & f) >> 2;
  };
  
  
  FrameDetails.prototype.argumentCount = function() {
    %CheckExecutionState(this.break_id_);
    return this.details_[kFrameDetailsArgumentCountIndex];
  };
  
  
  FrameDetails.prototype.argumentName = function(index) {
    %CheckExecutionState(this.break_id_);
    if (index >= 0 && index < this.argumentCount()) {
      return this.details_[kFrameDetailsFirstDynamicIndex +
                           index * kFrameDetailsNameValueSize +
                           kFrameDetailsNameIndex];
    }
  };
  
  
  FrameDetails.prototype.argumentValue = function(index) {
    %CheckExecutionState(this.break_id_);
    if (index >= 0 && index < this.argumentCount()) {
      return this.details_[kFrameDetailsFirstDynamicIndex +
                           index * kFrameDetailsNameValueSize +
                           kFrameDetailsValueIndex];
    }
  };
  
  
  FrameDetails.prototype.localCount = function() {
    %CheckExecutionState(this.break_id_);
    return this.details_[kFrameDetailsLocalCountIndex];
  };
  
  
  FrameDetails.prototype.sourcePosition = function() {
    %CheckExecutionState(this.break_id_);
    return this.details_[kFrameDetailsSourcePositionIndex];
  };
  
  
  FrameDetails.prototype.localName = function(index) {
    %CheckExecutionState(this.break_id_);
    if (index >= 0 && index < this.localCount()) {
      var locals_offset = kFrameDetailsFirstDynamicIndex +
                          this.argumentCount() * kFrameDetailsNameValueSize;
      return this.details_[locals_offset +
                           index * kFrameDetailsNameValueSize +
                           kFrameDetailsNameIndex];
    }
  };
  
  
  FrameDetails.prototype.localValue = function(index) {
    %CheckExecutionState(this.break_id_);
    if (index >= 0 && index < this.localCount()) {
      var locals_offset = kFrameDetailsFirstDynamicIndex +
                          this.argumentCount() * kFrameDetailsNameValueSize;
      return this.details_[locals_offset +
                           index * kFrameDetailsNameValueSize +
                           kFrameDetailsValueIndex];
    }
  };
  
  
  FrameDetails.prototype.returnValue = function() {
    %CheckExecutionState(this.break_id_);
    var return_value_offset =
        kFrameDetailsFirstDynamicIndex +
        (this.argumentCount() + this.localCount()) * kFrameDetailsNameValueSize;
    if (this.details_[kFrameDetailsAtReturnIndex]) {
      return this.details_[return_value_offset];
    }
  };
  
  
  FrameDetails.prototype.scopeCount = function() {
    if (IS_UNDEFINED(this.scopeCount_)) {
      this.scopeCount_ = %GetScopeCount(this.break_id_, this.frameId());
    }
    return this.scopeCount_;
  };
  
  
  /**
   * Mirror object for stack frames.
   * @param {number} break_id The break id in the VM for which this frame is
         valid
   * @param {number} index The frame index (top frame is index 0)
   * @constructor
   * @extends Mirror
   */
  function FrameMirror(break_id, index) {
    %_Call(Mirror, this, MirrorType.FRAME_TYPE);
    this.break_id_ = break_id;
    this.index_ = index;
    this.details_ = new FrameDetails(break_id, index);
  }
  inherits(FrameMirror, Mirror);
  
  
  FrameMirror.prototype.details = function() {
    return this.details_;
  };
  
  
  FrameMirror.prototype.index = function() {
    return this.index_;
  };
  
  
  FrameMirror.prototype.func = function() {
    if (this.func_) {
      return this.func_;
    }
  
    // Get the function for this frame from the VM.
    var f = this.details_.func();
  
    // Create a function mirror. NOTE: MakeMirror cannot be used here as the
    // value returned from the VM might be a string if the function for the
    // frame is unresolved.
    if (IS_FUNCTION(f)) {
      return this.func_ = MakeMirror(f);
    } else {
      return new UnresolvedFunctionMirror(f);
    }
  };
  
  
  FrameMirror.prototype.receiver = function() {
    return MakeMirror(this.details_.receiver());
  };
  
  
  FrameMirror.prototype.isConstructCall = function() {
    return this.details_.isConstructCall();
  };
  
  
  FrameMirror.prototype.isAtReturn = function() {
    return this.details_.isAtReturn();
  };
  
  
  FrameMirror.prototype.isDebuggerFrame = function() {
    return this.details_.isDebuggerFrame();
  };
  
  
  FrameMirror.prototype.isOptimizedFrame = function() {
    return this.details_.isOptimizedFrame();
  };
  
  
  FrameMirror.prototype.isInlinedFrame = function() {
    return this.details_.isInlinedFrame();
  };
  
  
  FrameMirror.prototype.inlinedFrameIndex = function() {
    return this.details_.inlinedFrameIndex();
  };
  
  
  FrameMirror.prototype.argumentCount = function() {
    return this.details_.argumentCount();
  };
  
  
  FrameMirror.prototype.argumentName = function(index) {
    return this.details_.argumentName(index);
  };
  
  
  FrameMirror.prototype.argumentValue = function(index) {
    return MakeMirror(this.details_.argumentValue(index));
  };
  
  
  FrameMirror.prototype.localCount = function() {
    return this.details_.localCount();
  };
  
  
  FrameMirror.prototype.localName = function(index) {
    return this.details_.localName(index);
  };
  
  
  FrameMirror.prototype.localValue = function(index) {
    return MakeMirror(this.details_.localValue(index));
  };
  
  
  FrameMirror.prototype.returnValue = function() {
    return MakeMirror(this.details_.returnValue());
  };
  
  
  FrameMirror.prototype.sourcePosition = function() {
    return this.details_.sourcePosition();
  };
  
  
  FrameMirror.prototype.sourceLocation = function() {
    var func = this.func();
    if (func.resolved()) {
      var script = func.script();
      if (script) {
        return script.locationFromPosition(this.sourcePosition(), true);
      }
    }
  };
  
  
  FrameMirror.prototype.sourceLine = function() {
    var location = this.sourceLocation();
    if (location) {
      return location.line;
    }
  };
  
  
  FrameMirror.prototype.sourceColumn = function() {
    var location = this.sourceLocation();
    if (location) {
      return location.column;
    }
  };
  
  
  FrameMirror.prototype.sourceLineText = function() {
    var location = this.sourceLocation();
    if (location) {
      return location.sourceText();
    }
  };
  
  
  FrameMirror.prototype.scopeCount = function() {
    return this.details_.scopeCount();
  };
  
  
  FrameMirror.prototype.scope = function(index) {
    return new ScopeMirror(this, UNDEFINED, index);
  };
  
  
  FrameMirror.prototype.allScopes = function(opt_ignore_nested_scopes) {
    var scopeDetails = %GetAllScopesDetails(this.break_id_,
                                            this.details_.frameId(),
                                            this.details_.inlinedFrameIndex(),
                                            !!opt_ignore_nested_scopes);
    var result = [];
    for (var i = 0; i < scopeDetails.length; ++i) {
      result.push(new ScopeMirror(this, UNDEFINED, i, scopeDetails[i]));
    }
    return result;
  };
  
  
  FrameMirror.prototype.evaluate = function(source, disable_break,
                                            opt_context_object) {
    return MakeMirror(%DebugEvaluate(this.break_id_,
                                     this.details_.frameId(),
                                     this.details_.inlinedFrameIndex(),
                                     source,
                                     TO_BOOLEAN(disable_break),
                                     opt_context_object));
  };
  
  
  FrameMirror.prototype.invocationText = function() {
    // Format frame invoaction (receiver, function and arguments).
    var result = '';
    var func = this.func();
    var receiver = this.receiver();
    if (this.isConstructCall()) {
      // For constructor frames display new followed by the function name.
      result += 'new ';
      result += func.name() ? func.name() : '[anonymous]';
    } else if (this.isDebuggerFrame()) {
      result += '[debugger]';
    } else {
      // If the receiver has a className which is 'global' don't display it.
      var display_receiver =
        !receiver.className || (receiver.className() != 'global');
      if (display_receiver) {
        result += receiver.toText();
      }
      // Try to find the function as a property in the receiver. Include the
      // prototype chain in the lookup.
      var property = GetUndefinedMirror();
      if (receiver.isObject()) {
        for (var r = receiver;
             !r.isNull() && property.isUndefined();
             r = r.protoObject()) {
          property = r.lookupProperty(func);
        }
      }
      if (!property.isUndefined()) {
        // The function invoked was found on the receiver. Use the property name
        // for the backtrace.
        if (!property.isIndexed()) {
          if (display_receiver) {
            result += '.';
          }
          result += property.name();
        } else {
          result += '[';
          result += property.name();
          result += ']';
        }
        // Also known as - if the name in the function doesn't match the name
        // under which it was looked up.
        if (func.name() && func.name() != property.name()) {
          result += '(aka ' + func.name() + ')';
        }
      } else {
        // The function invoked was not found on the receiver. Use the function
        // name if available for the backtrace.
        if (display_receiver) {
          result += '.';
        }
        result += func.name() ? func.name() : '[anonymous]';
      }
    }
  
    // Render arguments for normal frames.
    if (!this.isDebuggerFrame()) {
      result += '(';
      for (var i = 0; i < this.argumentCount(); i++) {
        if (i != 0) result += ', ';
        if (this.argumentName(i)) {
          result += this.argumentName(i);
          result += '=';
        }
        result += this.argumentValue(i).toText();
      }
      result += ')';
    }
  
    if (this.isAtReturn()) {
      result += ' returning ';
      result += this.returnValue().toText();
    }
  
    return result;
  };
  
  
  FrameMirror.prototype.sourceAndPositionText = function() {
    // Format source and position.
    var result = '';
    var func = this.func();
    if (func.resolved()) {
      var script = func.script();
      if (script) {
        if (script.name()) {
          result += script.name();
        } else {
          result += '[unnamed]';
        }
        if (!this.isDebuggerFrame()) {
          var location = this.sourceLocation();
          result += ' line ';
          result += !IS_UNDEFINED(location) ? (location.line + 1) : '?';
          result += ' column ';
          result += !IS_UNDEFINED(location) ? (location.column + 1) : '?';
          if (!IS_UNDEFINED(this.sourcePosition())) {
            result += ' (position ' + (this.sourcePosition() + 1) + ')';
          }
        }
      } else {
        result += '[no source]';
      }
    } else {
      result += '[unresolved]';
    }
  
    return result;
  };
  
  
  FrameMirror.prototype.localsText = function() {
    // Format local variables.
    var result = '';
    var locals_count = this.localCount();
    if (locals_count > 0) {
      for (var i = 0; i < locals_count; ++i) {
        result += '      var ';
        result += this.localName(i);
        result += ' = ';
        result += this.localValue(i).toText();
        if (i < locals_count - 1) result += '\n';
      }
    }
  
    return result;
  };
  
  
  FrameMirror.prototype.restart = function() {
    var result = %LiveEditRestartFrame(this.break_id_, this.index_);
    if (IS_UNDEFINED(result)) {
      result = "Failed to find requested frame";
    }
    return result;
  };
  
  
  FrameMirror.prototype.toText = function(opt_locals) {
    var result = '';
    result += '#' + (this.index() <= 9 ? '0' : '') + this.index();
    result += ' ';
    result += this.invocationText();
    result += ' ';
    result += this.sourceAndPositionText();
    if (opt_locals) {
      result += '\n';
      result += this.localsText();
    }
    return result;
  };
  
  
  // This indexes correspond definitions in debug-scopes.h.
  var kScopeDetailsTypeIndex = 0;
  var kScopeDetailsObjectIndex = 1;
  var kScopeDetailsNameIndex = 2;
  var kScopeDetailsStartPositionIndex = 3;
  var kScopeDetailsEndPositionIndex = 4;
  var kScopeDetailsFunctionIndex = 5;
  
  function ScopeDetails(frame, fun, index, opt_details) {
    if (frame) {
      this.break_id_ = frame.break_id_;
      this.details_ = opt_details ||
                      %GetScopeDetails(frame.break_id_,
                                       frame.details_.frameId(),
                                       frame.details_.inlinedFrameIndex(),
                                       index);
      this.frame_id_ = frame.details_.frameId();
      this.inlined_frame_id_ = frame.details_.inlinedFrameIndex();
    } else {
      this.details_ = opt_details || %GetFunctionScopeDetails(fun.value(), index);
      this.fun_value_ = fun.value();
      this.break_id_ = UNDEFINED;
    }
    this.index_ = index;
  }
  
  
  ScopeDetails.prototype.type = function() {
    if (!IS_UNDEFINED(this.break_id_)) {
      %CheckExecutionState(this.break_id_);
    }
    return this.details_[kScopeDetailsTypeIndex];
  };
  
  
  ScopeDetails.prototype.object = function() {
    if (!IS_UNDEFINED(this.break_id_)) {
      %CheckExecutionState(this.break_id_);
    }
    return this.details_[kScopeDetailsObjectIndex];
  };
  
  
  ScopeDetails.prototype.name = function() {
    if (!IS_UNDEFINED(this.break_id_)) {
      %CheckExecutionState(this.break_id_);
    }
    return this.details_[kScopeDetailsNameIndex];
  };
  
  
  ScopeDetails.prototype.startPosition = function() {
    if (!IS_UNDEFINED(this.break_id_)) {
      %CheckExecutionState(this.break_id_);
    }
    return this.details_[kScopeDetailsStartPositionIndex];
  }
  
  
  ScopeDetails.prototype.endPosition = function() {
    if (!IS_UNDEFINED(this.break_id_)) {
      %CheckExecutionState(this.break_id_);
    }
    return this.details_[kScopeDetailsEndPositionIndex];
  }
  
  ScopeDetails.prototype.func = function() {
    if (!IS_UNDEFINED(this.break_id_)) {
      %CheckExecutionState(this.break_id_);
    }
    return this.details_[kScopeDetailsFunctionIndex];
  }
  
  
  ScopeDetails.prototype.setVariableValueImpl = function(name, new_value) {
    var raw_res;
    if (!IS_UNDEFINED(this.break_id_)) {
      %CheckExecutionState(this.break_id_);
      raw_res = %SetScopeVariableValue(this.break_id_, this.frame_id_,
          this.inlined_frame_id_, this.index_, name, new_value);
    } else {
      raw_res = %SetScopeVariableValue(this.fun_value_, null, null, this.index_,
          name, new_value);
    }
    if (!raw_res) throw MakeError(kDebugger, "Failed to set variable value");
  };
  
  
  /**
   * Mirror object for scope of frame or function. Either frame or function must
   * be specified.
   * @param {FrameMirror} frame The frame this scope is a part of
   * @param {FunctionMirror} function The function this scope is a part of
   * @param {number} index The scope index in the frame
   * @param {Array=} opt_details Raw scope details data
   * @constructor
   * @extends Mirror
   */
  function ScopeMirror(frame, fun, index, opt_details) {
    %_Call(Mirror, this, MirrorType.SCOPE_TYPE);
    if (frame) {
      this.frame_index_ = frame.index_;
    } else {
      this.frame_index_ = UNDEFINED;
    }
    this.scope_index_ = index;
    this.details_ = new ScopeDetails(frame, fun, index, opt_details);
  }
  inherits(ScopeMirror, Mirror);
  
  
  ScopeMirror.prototype.details = function() {
    return this.details_;
  };
  
  
  ScopeMirror.prototype.frameIndex = function() {
    return this.frame_index_;
  };
  
  
  ScopeMirror.prototype.scopeIndex = function() {
    return this.scope_index_;
  };
  
  
  ScopeMirror.prototype.scopeType = function() {
    return this.details_.type();
  };
  
  
  ScopeMirror.prototype.scopeObject = function() {
    // For local, closure and script scopes create a transient mirror
    // as these objects are created on the fly materializing the local
    // or closure scopes and therefore will not preserve identity.
    var transient = this.scopeType() == ScopeType.Local ||
                    this.scopeType() == ScopeType.Closure ||
                    this.scopeType() == ScopeType.Script;
    return MakeMirror(this.details_.object(), transient);
  };
  
  
  ScopeMirror.prototype.setVariableValue = function(name, new_value) {
    this.details_.setVariableValueImpl(name, new_value);
  };
  
  
  /**
   * Mirror object for script source.
   * @param {Script} script The script object
   * @constructor
   * @extends Mirror
   */
  function ScriptMirror(script) {
    %_Call(Mirror, this, MirrorType.SCRIPT_TYPE);
    this.script_ = script;
    this.context_ = new ContextMirror(script.context_data);
    this.allocateHandle_();
  }
  inherits(ScriptMirror, Mirror);
  
  
  ScriptMirror.prototype.value = function() {
    return this.script_;
  };
  
  
  ScriptMirror.prototype.name = function() {
    return this.script_.name || this.script_.nameOrSourceURL();
  };
  
  
  ScriptMirror.prototype.id = function() {
    return this.script_.id;
  };
  
  
  ScriptMirror.prototype.source = function() {
    return this.script_.source;
  };
  
  
  ScriptMirror.prototype.setSource = function(source) {
    %DebugSetScriptSource(this.script_, source);
  };
  
  
  ScriptMirror.prototype.lineOffset = function() {
    return this.script_.line_offset;
  };
  
  
  ScriptMirror.prototype.columnOffset = function() {
    return this.script_.column_offset;
  };
  
  
  ScriptMirror.prototype.data = function() {
    return this.script_.data;
  };
  
  
  ScriptMirror.prototype.scriptType = function() {
    return this.script_.type;
  };
  
  
  ScriptMirror.prototype.compilationType = function() {
    return this.script_.compilation_type;
  };
  
  
  ScriptMirror.prototype.lineCount = function() {
    return this.script_.lineCount();
  };
  
  
  ScriptMirror.prototype.locationFromPosition = function(
      position, include_resource_offset) {
    return this.script_.locationFromPosition(position, include_resource_offset);
  };
  
  
  ScriptMirror.prototype.sourceSlice = function (opt_from_line, opt_to_line) {
    return this.script_.sourceSlice(opt_from_line, opt_to_line);
  };
  
  
  ScriptMirror.prototype.context = function() {
    return this.context_;
  };
  
  
  ScriptMirror.prototype.evalFromScript = function() {
    return MakeMirror(this.script_.eval_from_script);
  };
  
  
  ScriptMirror.prototype.evalFromFunctionName = function() {
    return MakeMirror(this.script_.eval_from_function_name);
  };
  
  
  ScriptMirror.prototype.evalFromLocation = function() {
    var eval_from_script = this.evalFromScript();
    if (!eval_from_script.isUndefined()) {
      var position = this.script_.eval_from_script_position;
      return eval_from_script.locationFromPosition(position, true);
    }
  };
  
  
  ScriptMirror.prototype.toText = function() {
    var result = '';
    result += this.name();
    result += ' (lines: ';
    if (this.lineOffset() > 0) {
      result += this.lineOffset();
      result += '-';
      result += this.lineOffset() + this.lineCount() - 1;
    } else {
      result += this.lineCount();
    }
    result += ')';
    return result;
  };
  
  
  /**
   * Mirror object for context.
   * @param {Object} data The context data
   * @constructor
   * @extends Mirror
   */
  function ContextMirror(data) {
    %_Call(Mirror, this, MirrorType.CONTEXT_TYPE);
    this.data_ = data;
    this.allocateHandle_();
  }
  inherits(ContextMirror, Mirror);
  
  
  ContextMirror.prototype.data = function() {
    return this.data_;
  };
  
  
  /**
   * Returns a mirror serializer
   *
   * @param {boolean} details Set to true to include details
   * @param {Object} options Options comtrolling the serialization
   *     The following options can be set:
   *       includeSource: include ths full source of scripts
   * @returns {MirrorSerializer} mirror serializer
   */
  function MakeMirrorSerializer(details, options) {
    return new JSONProtocolSerializer(details, options);
  }
  
  
  /**
   * Object for serializing a mirror objects and its direct references.
   * @param {boolean} details Indicates whether to include details for the mirror
   *     serialized
   * @constructor
   */
  function JSONProtocolSerializer(details, options) {
    this.details_ = details;
    this.options_ = options;
    this.mirrors_ = [ ];
  }
  
  
  /**
   * Returns a serialization of an object reference. The referenced object are
   * added to the serialization state.
   *
   * @param {Mirror} mirror The mirror to serialize
   * @returns {String} JSON serialization
   */
  JSONProtocolSerializer.prototype.serializeReference = function(mirror) {
    return this.serialize_(mirror, true, true);
  };
  
  
  /**
   * Returns a serialization of an object value. The referenced objects are
   * added to the serialization state.
   *
   * @param {Mirror} mirror The mirror to serialize
   * @returns {String} JSON serialization
   */
  JSONProtocolSerializer.prototype.serializeValue = function(mirror) {
    var json = this.serialize_(mirror, false, true);
    return json;
  };
  
  
  /**
   * Returns a serialization of all the objects referenced.
   *
   * @param {Mirror} mirror The mirror to serialize.
   * @returns {Array.<Object>} Array of the referenced objects converted to
   *     protcol objects.
   */
  JSONProtocolSerializer.prototype.serializeReferencedObjects = function() {
    // Collect the protocol representation of the referenced objects in an array.
    var content = [];
  
    // Get the number of referenced objects.
    var count = this.mirrors_.length;
  
    for (var i = 0; i < count; i++) {
      content.push(this.serialize_(this.mirrors_[i], false, false));
    }
  
    return content;
  };
  
  
  JSONProtocolSerializer.prototype.includeSource_ = function() {
    return this.options_ && this.options_.includeSource;
  };
  
  
  JSONProtocolSerializer.prototype.inlineRefs_ = function() {
    return this.options_ && this.options_.inlineRefs;
  };
  
  
  JSONProtocolSerializer.prototype.maxStringLength_ = function() {
    if (IS_UNDEFINED(this.options_) ||
        IS_UNDEFINED(this.options_.maxStringLength)) {
      return kMaxProtocolStringLength;
    }
    return this.options_.maxStringLength;
  };
  
  
  JSONProtocolSerializer.prototype.add_ = function(mirror) {
    // If this mirror is already in the list just return.
    for (var i = 0; i < this.mirrors_.length; i++) {
      if (this.mirrors_[i] === mirror) {
        return;
      }
    }
  
    // Add the mirror to the list of mirrors to be serialized.
    this.mirrors_.push(mirror);
  };
  
  
  /**
   * Formats mirror object to protocol reference object with some data that can
   * be used to display the value in debugger.
   * @param {Mirror} mirror Mirror to serialize.
   * @return {Object} Protocol reference object.
   */
  JSONProtocolSerializer.prototype.serializeReferenceWithDisplayData_ =
      function(mirror) {
    var o = {};
    o.ref = mirror.handle();
    o.type = mirror.type();
    switch (mirror.type()) {
      case MirrorType.UNDEFINED_TYPE:
      case MirrorType.NULL_TYPE:
      case MirrorType.BOOLEAN_TYPE:
      case MirrorType.NUMBER_TYPE:
        o.value = mirror.value();
        break;
      case MirrorType.STRING_TYPE:
        o.value = mirror.getTruncatedValue(this.maxStringLength_());
        break;
      case MirrorType.SYMBOL_TYPE:
        o.description = mirror.description();
        break;
      case MirrorType.FUNCTION_TYPE:
        o.name = mirror.name();
        o.inferredName = mirror.inferredName();
        if (mirror.script()) {
          o.scriptId = mirror.script().id();
        }
        break;
      case MirrorType.ERROR_TYPE:
      case MirrorType.REGEXP_TYPE:
        o.value = mirror.toText();
        break;
      case MirrorType.OBJECT_TYPE:
        o.className = mirror.className();
        break;
    }
    return o;
  };
  
  
  JSONProtocolSerializer.prototype.serialize_ = function(mirror, reference,
                                                         details) {
    // If serializing a reference to a mirror just return the reference and add
    // the mirror to the referenced mirrors.
    if (reference &&
        (mirror.isValue() || mirror.isScript() || mirror.isContext())) {
      if (this.inlineRefs_() && mirror.isValue()) {
        return this.serializeReferenceWithDisplayData_(mirror);
      } else {
        this.add_(mirror);
        return {'ref' : mirror.handle()};
      }
    }
  
    // Collect the JSON property/value pairs.
    var content = {};
  
    // Add the mirror handle.
    if (mirror.isValue() || mirror.isScript() || mirror.isContext()) {
      content.handle = mirror.handle();
    }
  
    // Always add the type.
    content.type = mirror.type();
  
    switch (mirror.type()) {
      case MirrorType.UNDEFINED_TYPE:
      case MirrorType.NULL_TYPE:
        // Undefined and null are represented just by their type.
        break;
  
      case MirrorType.BOOLEAN_TYPE:
        // Boolean values are simply represented by their value.
        content.value = mirror.value();
        break;
  
      case MirrorType.NUMBER_TYPE:
        // Number values are simply represented by their value.
        content.value = NumberToJSON_(mirror.value());
        break;
  
      case MirrorType.STRING_TYPE:
        // String values might have their value cropped to keep down size.
        if (this.maxStringLength_() != -1 &&
            mirror.length() > this.maxStringLength_()) {
          var str = mirror.getTruncatedValue(this.maxStringLength_());
          content.value = str;
          content.fromIndex = 0;
          content.toIndex = this.maxStringLength_();
        } else {
          content.value = mirror.value();
        }
        content.length = mirror.length();
        break;
  
      case MirrorType.SYMBOL_TYPE:
        content.description = mirror.description();
        break;
  
      case MirrorType.OBJECT_TYPE:
      case MirrorType.FUNCTION_TYPE:
      case MirrorType.ERROR_TYPE:
      case MirrorType.REGEXP_TYPE:
      case MirrorType.PROMISE_TYPE:
      case MirrorType.GENERATOR_TYPE:
        // Add object representation.
        this.serializeObject_(mirror, content, details);
        break;
  
      case MirrorType.PROPERTY_TYPE:
      case MirrorType.INTERNAL_PROPERTY_TYPE:
        throw MakeError(kDebugger,
                       'PropertyMirror cannot be serialized independently');
        break;
  
      case MirrorType.FRAME_TYPE:
        // Add object representation.
        this.serializeFrame_(mirror, content);
        break;
  
      case MirrorType.SCOPE_TYPE:
        // Add object representation.
        this.serializeScope_(mirror, content);
        break;
  
      case MirrorType.SCRIPT_TYPE:
        // Script is represented by id, name and source attributes.
        if (mirror.name()) {
          content.name = mirror.name();
        }
        content.id = mirror.id();
        content.lineOffset = mirror.lineOffset();
        content.columnOffset = mirror.columnOffset();
        content.lineCount = mirror.lineCount();
        if (mirror.data()) {
          content.data = mirror.data();
        }
        if (this.includeSource_()) {
          content.source = mirror.source();
        } else {
          var sourceStart = mirror.source().substring(0, 80);
          content.sourceStart = sourceStart;
        }
        content.sourceLength = mirror.source().length;
        content.scriptType = mirror.scriptType();
        content.compilationType = mirror.compilationType();
        // For compilation type eval emit information on the script from which
        // eval was called if a script is present.
        if (mirror.compilationType() == 1 &&
            mirror.evalFromScript()) {
          content.evalFromScript =
              this.serializeReference(mirror.evalFromScript());
          var evalFromLocation = mirror.evalFromLocation();
          if (evalFromLocation) {
            content.evalFromLocation = { line: evalFromLocation.line,
                                         column: evalFromLocation.column };
          }
          if (mirror.evalFromFunctionName()) {
            content.evalFromFunctionName = mirror.evalFromFunctionName();
          }
        }
        if (mirror.context()) {
          content.context = this.serializeReference(mirror.context());
        }
        break;
  
      case MirrorType.CONTEXT_TYPE:
        content.data = mirror.data();
        break;
    }
  
    // Always add the text representation.
    content.text = mirror.toText();
  
    // Create and return the JSON string.
    return content;
  };
  
  
  /**
   * Serialize object information to the following JSON format.
   *
   *   {"className":"<class name>",
   *    "constructorFunction":{"ref":<number>},
   *    "protoObject":{"ref":<number>},
   *    "prototypeObject":{"ref":<number>},
   *    "namedInterceptor":<boolean>,
   *    "indexedInterceptor":<boolean>,
   *    "properties":[<properties>],
   *    "internalProperties":[<internal properties>]}
   */
  JSONProtocolSerializer.prototype.serializeObject_ = function(mirror, content,
                                                               details) {
    // Add general object properties.
    content.className = mirror.className();
    content.constructorFunction =
        this.serializeReference(mirror.constructorFunction());
    content.protoObject = this.serializeReference(mirror.protoObject());
    content.prototypeObject = this.serializeReference(mirror.prototypeObject());
  
    // Add flags to indicate whether there are interceptors.
    if (mirror.hasNamedInterceptor()) {
      content.namedInterceptor = true;
    }
    if (mirror.hasIndexedInterceptor()) {
      content.indexedInterceptor = true;
    }
  
    if (mirror.isFunction()) {
      // Add function specific properties.
      content.name = mirror.name();
      if (!IS_UNDEFINED(mirror.inferredName())) {
        content.inferredName = mirror.inferredName();
      }
      content.resolved = mirror.resolved();
      if (mirror.resolved()) {
        content.source = mirror.source();
      }
      if (mirror.script()) {
        content.script = this.serializeReference(mirror.script());
        content.scriptId = mirror.script().id();
  
        serializeLocationFields(mirror.sourceLocation(), content);
      }
  
      content.scopes = [];
      for (var i = 0; i < mirror.scopeCount(); i++) {
        var scope = mirror.scope(i);
        content.scopes.push({
          type: scope.scopeType(),
          index: i
        });
      }
    }
  
    if (mirror.isGenerator()) {
      // Add generator specific properties.
  
      // Either 'running', 'closed', or 'suspended'.
      content.status = mirror.status();
  
      content.func = this.serializeReference(mirror.func())
      content.receiver = this.serializeReference(mirror.receiver())
  
      // If the generator is suspended, the content add line/column properties.
      serializeLocationFields(mirror.sourceLocation(), content);
  
      // TODO(wingo): Also serialize a reference to the context (scope chain).
    }
  
    if (mirror.isDate()) {
      // Add date specific properties.
      content.value = mirror.value();
    }
  
    if (mirror.isPromise()) {
      // Add promise specific properties.
      content.status = mirror.status();
      content.promiseValue = this.serializeReference(mirror.promiseValue());
    }
  
    // Add actual properties - named properties followed by indexed properties.
    var properties = mirror.propertyNames();
    for (var i = 0; i < properties.length; i++) {
      var propertyMirror = mirror.property(properties[i]);
      properties[i] = this.serializeProperty_(propertyMirror);
      if (details) {
        this.add_(propertyMirror.value());
      }
    }
    content.properties = properties;
  
    var internalProperties = mirror.internalProperties();
    if (internalProperties.length > 0) {
      var ip = [];
      for (var i = 0; i < internalProperties.length; i++) {
        ip.push(this.serializeInternalProperty_(internalProperties[i]));
      }
      content.internalProperties = ip;
    }
  };
  
  
  /**
   * Serialize location information to the following JSON format:
   *
   *   "position":"<position>",
   *   "line":"<line>",
   *   "column":"<column>",
   *
   * @param {SourceLocation} location The location to serialize, may be undefined.
   */
  function serializeLocationFields (location, content) {
    if (!location) {
      return;
    }
    content.position = location.position;
    var line = location.line;
    if (!IS_UNDEFINED(line)) {
      content.line = line;
    }
    var column = location.column;
    if (!IS_UNDEFINED(column)) {
      content.column = column;
    }
  }
  
  
  /**
   * Serialize property information to the following JSON format for building the
   * array of properties.
   *
   *   {"name":"<property name>",
   *    "attributes":<number>,
   *    "propertyType":<number>,
   *    "ref":<number>}
   *
   * If the attribute for the property is PropertyAttribute.None it is not added.
   * Here are a couple of examples.
   *
   *   {"name":"hello","propertyType":0,"ref":1}
   *   {"name":"length","attributes":7,"propertyType":3,"ref":2}
   *
   * @param {PropertyMirror} propertyMirror The property to serialize.
   * @returns {Object} Protocol object representing the property.
   */
  JSONProtocolSerializer.prototype.serializeProperty_ = function(propertyMirror) {
    var result = {};
  
    result.name = propertyMirror.name();
    var propertyValue = propertyMirror.value();
    if (this.inlineRefs_() && propertyValue.isValue()) {
      result.value = this.serializeReferenceWithDisplayData_(propertyValue);
    } else {
      if (propertyMirror.attributes() != PropertyAttribute.None) {
        result.attributes = propertyMirror.attributes();
      }
      result.propertyType = propertyMirror.propertyType();
      result.ref = propertyValue.handle();
    }
    return result;
  };
  
  
  /**
   * Serialize internal property information to the following JSON format for
   * building the array of properties.
   *
   *   {"name":"<property name>",
   *    "ref":<number>}
   *
   *   {"name":"[[BoundThis]]","ref":117}
   *
   * @param {InternalPropertyMirror} propertyMirror The property to serialize.
   * @returns {Object} Protocol object representing the property.
   */
  JSONProtocolSerializer.prototype.serializeInternalProperty_ =
      function(propertyMirror) {
    var result = {};
  
    result.name = propertyMirror.name();
    var propertyValue = propertyMirror.value();
    if (this.inlineRefs_() && propertyValue.isValue()) {
      result.value = this.serializeReferenceWithDisplayData_(propertyValue);
    } else {
      result.ref = propertyValue.handle();
    }
    return result;
  };
  
  
  JSONProtocolSerializer.prototype.serializeFrame_ = function(mirror, content) {
    content.index = mirror.index();
    content.receiver = this.serializeReference(mirror.receiver());
    var func = mirror.func();
    content.func = this.serializeReference(func);
    var script = func.script();
    if (script) {
      content.script = this.serializeReference(script);
    }
    content.constructCall = mirror.isConstructCall();
    content.atReturn = mirror.isAtReturn();
    if (mirror.isAtReturn()) {
      content.returnValue = this.serializeReference(mirror.returnValue());
    }
    content.debuggerFrame = mirror.isDebuggerFrame();
    var x = new GlobalArray(mirror.argumentCount());
    for (var i = 0; i < mirror.argumentCount(); i++) {
      var arg = {};
      var argument_name = mirror.argumentName(i);
      if (argument_name) {
        arg.name = argument_name;
      }
      arg.value = this.serializeReference(mirror.argumentValue(i));
      x[i] = arg;
    }
    content.arguments = x;
    var x = new GlobalArray(mirror.localCount());
    for (var i = 0; i < mirror.localCount(); i++) {
      var local = {};
      local.name = mirror.localName(i);
      local.value = this.serializeReference(mirror.localValue(i));
      x[i] = local;
    }
    content.locals = x;
    serializeLocationFields(mirror.sourceLocation(), content);
    var source_line_text = mirror.sourceLineText();
    if (!IS_UNDEFINED(source_line_text)) {
      content.sourceLineText = source_line_text;
    }
  
    content.scopes = [];
    for (var i = 0; i < mirror.scopeCount(); i++) {
      var scope = mirror.scope(i);
      content.scopes.push({
        type: scope.scopeType(),
        index: i
      });
    }
  };
  
  
  JSONProtocolSerializer.prototype.serializeScope_ = function(mirror, content) {
    content.index = mirror.scopeIndex();
    content.frameIndex = mirror.frameIndex();
    content.type = mirror.scopeType();
    content.object = this.inlineRefs_() ?
                     this.serializeValue(mirror.scopeObject()) :
                     this.serializeReference(mirror.scopeObject());
  };
  
  
  /**
   * Convert a number to a protocol value. For all finite numbers the number
   * itself is returned. For non finite numbers NaN, Infinite and
   * -Infinite the string representation "NaN", "Infinite" or "-Infinite"
   * (not including the quotes) is returned.
   *
   * @param {number} value The number value to convert to a protocol value.
   * @returns {number|string} Protocol value.
   */
  function NumberToJSON_(value) {
    if (IsNaN(value)) {
      return 'NaN';
    }
    if (!NUMBER_IS_FINITE(value)) {
      if (value > 0) {
        return 'Infinity';
      } else {
        return '-Infinity';
      }
    }
    return value;
  }
  
  // ----------------------------------------------------------------------------
  // Exports
  
  utils.InstallFunctions(global, DONT_ENUM, [
    "MakeMirror", MakeMirror,
    "MakeMirrorSerializer", MakeMirrorSerializer,
    "LookupMirror", LookupMirror,
    "ToggleMirrorCache", ToggleMirrorCache,
    "MirrorCacheIsEmpty", MirrorCacheIsEmpty,
  ]);
  
  utils.InstallConstants(global, [
    "ScopeType", ScopeType,
    "PropertyType", PropertyType,
    "PropertyAttribute", PropertyAttribute,
    "Mirror", Mirror,
    "ValueMirror", ValueMirror,
    "UndefinedMirror", UndefinedMirror,
    "NullMirror", NullMirror,
    "BooleanMirror", BooleanMirror,
    "NumberMirror", NumberMirror,
    "StringMirror", StringMirror,
    "SymbolMirror", SymbolMirror,
    "ObjectMirror", ObjectMirror,
    "FunctionMirror", FunctionMirror,
    "UnresolvedFunctionMirror", UnresolvedFunctionMirror,
    "ArrayMirror", ArrayMirror,
    "DateMirror", DateMirror,
    "RegExpMirror", RegExpMirror,
    "ErrorMirror", ErrorMirror,
    "PromiseMirror", PromiseMirror,
    "MapMirror", MapMirror,
    "SetMirror", SetMirror,
    "IteratorMirror", IteratorMirror,
    "GeneratorMirror", GeneratorMirror,
    "PropertyMirror", PropertyMirror,
    "InternalPropertyMirror", InternalPropertyMirror,
    "FrameMirror", FrameMirror,
    "ScriptMirror", ScriptMirror,
    "ScopeMirror", ScopeMirror,
    "FrameDetails", FrameDetails,
  ]);
  
  // Functions needed by the debugger runtime.
  utils.InstallFunctions(utils, DONT_ENUM, [
    "ClearMirrorCache", ClearMirrorCache
  ]);
  
  // Export to debug.js
  utils.Export(function(to) {
    to.MirrorType = MirrorType;
  });
  })
  