From: sgjesse@chromium.org <sgjesse@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Fri, 16 Jan 2009 09:54:46 +0000 (+0000)
Subject: Added handles to the mirror objects. When a mirror for an object is created
X-Git-Tag: upstream/4.7.83~24791
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c2c780bfc4e21b597b6c52b86d593147ee3640bf;p=platform%2Fupstream%2Fv8.git

Added handles to the mirror objects. When a mirror for an object is created
it is assigned a numeric handle. Handles are used to make a 1:1
correspondence between objects and mirrors. Currently the mirrors are
cached in a JavaScript array and when creating a mirror this cache is
checked to see if a mirror already exists for the object. This cache is
cleared when leaving the debugger.

Changed the serialization format to take advantage of these handles. When
an object is serialized referenced objects are represented just by their
handle id serialized as '{ref:<handle>}'. During serialization the
referenced handles are collected and the serializer can provide a
serialization of all the referenced objects.

Removed the special handling of array properties. Indexed properties and
the length property are now rendered as named properties in the
serialization.

Removed the special serialization handling of RegExp properties. The
properties 'source', 'global', 'ignoreCase' and 'multiline' are serialized
with the rest of the properties.

Changed a lot of tests to handle the changed format.
Review URL: http://codereview.chromium.org/18092

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1093 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---

diff --git a/src/debug-delay.js b/src/debug-delay.js
index 24b83a53c..d38894652 100644
--- a/src/debug-delay.js
+++ b/src/debug-delay.js
@@ -994,22 +994,25 @@ ResponsePacket.prototype.toJSONProtocol = function() {
   if (this.body) {
     json += ',"body":';
     // Encode the body part.
-    if (this.body.toJSONProtocol) {
-      json += this.body.toJSONProtocol(true);
+    var serializer = MakeMirrorSerializer(true);
+    if (this.body instanceof Mirror) {
+      json += serializer.serializeValue(this.body);
     } else if (this.body instanceof Array) {
       json += '[';
       for (var i = 0; i < this.body.length; i++) {
         if (i != 0) json += ',';
-        if (this.body[i].toJSONProtocol) {
-          json += this.body[i].toJSONProtocol(true)
+        if (this.body[i] instanceof Mirror) {
+          json += serializer.serializeValue(this.body[i]);
         } else {
-          json += SimpleObjectToJSON_(this.body[i]);
+          json += SimpleObjectToJSON_(this.body[i], serializer);
         }
       }
       json += ']';
     } else {
-      json += SimpleObjectToJSON_(this.body);
+      json += SimpleObjectToJSON_(this.body, serializer);
     }
+    json += ',"refs":';
+    json += serializer.serializeReferencedObjects();
   }
   if (this.message) {
     json += ',"message":' + StringToJSON_(this.message) ;
@@ -1568,9 +1571,11 @@ DebugCommandProcessor.prototype.formatCFrame = function(cframe_value) {
  * a general implementation but sufficient for the debugger. Note that circular
  * structures will cause infinite recursion.
  * @param {Object} object The object to format as JSON
+ * @param {MirrorSerializer} mirror_serializer The serializer to use if any
+ *     mirror objects are encountered.
  * @return {string} JSON formatted object value
  */
-function SimpleObjectToJSON_(object) {
+function SimpleObjectToJSON_(object, mirror_serializer) {
   var content = [];
   for (var key in object) {
     // Only consider string keys.
@@ -1584,9 +1589,9 @@ function SimpleObjectToJSON_(object) {
           if (typeof property_value.toJSONProtocol == 'function') {
             property_value_json = property_value.toJSONProtocol(true)
           } else if (IS_ARRAY(property_value)){
-            property_value_json = SimpleArrayToJSON_(property_value);
+            property_value_json = SimpleArrayToJSON_(property_value, mirror_serializer);
           } else {
-            property_value_json = SimpleObjectToJSON_(property_value);
+            property_value_json = SimpleObjectToJSON_(property_value, mirror_serializer);
           }
           break;
 
@@ -1620,10 +1625,12 @@ function SimpleObjectToJSON_(object) {
 /**
  * Convert an array to its JSON representation. This is a VERY simple
  * implementation just to support what is needed for the debugger.
- * @param {Array} arrya The array to format as JSON
+ * @param {Array} array The array to format as JSON
+ * @param {MirrorSerializer} mirror_serializer The serializer to use if any
+ *     mirror objects are encountered.
  * @return {string} JSON formatted array value
  */
-function SimpleArrayToJSON_(array) {
+function SimpleArrayToJSON_(array, mirror_serializer) {
   // Make JSON array representation.
   var json = '[';
   for (var i = 0; i < array.length; i++) {
@@ -1631,8 +1638,8 @@ function SimpleArrayToJSON_(array) {
       json += ',';
     }
     var elem = array[i];
-    if (elem.toJSONProtocol) {
-      json += elem.toJSONProtocol(true)
+    if (elem instanceof Mirror) {
+      json += mirror_serializer.serializeValue(elem);
     } else if (IS_OBJECT(elem))  {
       json += SimpleObjectToJSON_(elem);
     } else if (IS_BOOLEAN(elem)) {
diff --git a/src/debug.cc b/src/debug.cc
index 368a9755d..ef059addc 100644
--- a/src/debug.cc
+++ b/src/debug.cc
@@ -1303,6 +1303,22 @@ bool Debug::IsDebugGlobal(GlobalObject* global) {
 }
 
 
+void Debug::ClearMirrorCache() {
+  ASSERT(Top::context() == *Debug::debug_context());
+
+  // Clear the mirror cache.
+  Handle<String> function_name =
+      Factory::LookupSymbol(CStrVector("ClearMirrorCache"));
+  Handle<Object> fun(Top::global()->GetProperty(*function_name));
+  ASSERT(fun->IsJSFunction());
+  bool caught_exception;
+  Handle<Object> js_object = Execution::TryCall(
+      Handle<JSFunction>::cast(fun),
+      Handle<JSObject>(Debug::debug_context()->global()),
+      0, NULL, &caught_exception);
+}
+
+
 bool Debugger::debugger_active_ = false;
 bool Debugger::compiling_natives_ = false;
 bool Debugger::is_loading_debugger_ = false;
@@ -1628,6 +1644,9 @@ void Debugger::ProcessDebugEvent(v8::DebugEvent event,
       }
     }
   }
+
+  // Clear the mirror cache.
+  Debug::ClearMirrorCache();
 }
 
 
diff --git a/src/debug.h b/src/debug.h
index df24ec550..6520f0cce 100644
--- a/src/debug.h
+++ b/src/debug.h
@@ -260,6 +260,9 @@ class Debug {
   static char* RestoreDebug(char* from);
   static int ArchiveSpacePerThread();
 
+  // Mirror cache handling.
+  static void ClearMirrorCache();
+
   // Code generation assumptions.
   static const int kIa32CallInstructionLength = 5;
   static const int kIa32JSReturnSequenceLength = 6;
diff --git a/src/mirror-delay.js b/src/mirror-delay.js
index 7e25501e0..f087f68e9 100644
--- a/src/mirror-delay.js
+++ b/src/mirror-delay.js
@@ -33,6 +33,18 @@ RegExp;
 Date;
 
 
+var next_handle_ = 0;
+var mirror_cache_ = [];
+
+/**
+ * Clear the mirror handle cache.
+ */
+function ClearMirrorCache() {
+  next_handle_ = 0;
+  mirror_cache_ = [];
+}
+
+
 /**
  * Returns the mirror for a specified value or object.
  *
@@ -40,17 +52,50 @@ Date;
  * @returns {Mirror} the mirror reflects the passed value or object
  */
 function MakeMirror(value) {
-  if (IS_UNDEFINED(value)) return new UndefinedMirror();
-  if (IS_NULL(value)) return new NullMirror();
-  if (IS_BOOLEAN(value)) return new BooleanMirror(value);
-  if (IS_NUMBER(value)) return new NumberMirror(value);
-  if (IS_STRING(value)) return new StringMirror(value);
-  if (IS_ARRAY(value)) return new ArrayMirror(value);
-  if (IS_DATE(value)) return new DateMirror(value);
-  if (IS_FUNCTION(value)) return new FunctionMirror(value);
-  if (IS_REGEXP(value)) return new RegExpMirror(value);
-  if (IS_ERROR(value)) return new ErrorMirror(value);
-  return new ObjectMirror(value);
+  var mirror;
+  for (id in mirror_cache_) {
+    mirror = mirror_cache_[id];
+    if (mirror.value() === 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_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 {
+    mirror = new ObjectMirror(value);
+  }
+
+  mirror_cache_[mirror.handle()] = mirror;
+  return mirror;
+}
+
+
+/**
+ * Returns the mirror for the undefined value.
+ *
+ * @returns {Mirror} the mirror reflects the undefined value
+ */
+function GetUndefinedMirror() {
+  return MakeMirror(void 0);
 }
 
 
@@ -87,7 +132,6 @@ const FUNCTION_TYPE = 'function';
 const REGEXP_TYPE = 'regexp';
 const ERROR_TYPE = 'error';
 const PROPERTY_TYPE = 'property';
-const ACCESSOR_TYPE = 'accessor';
 const FRAME_TYPE = 'frame';
 const SCRIPT_TYPE = 'script';
 
@@ -154,6 +198,15 @@ Mirror.prototype.type = function() {
 };
 
 
+/**
+ * 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.
@@ -289,18 +342,6 @@ Mirror.prototype.isScript = function() {
 }
 
 
-/**
- * Serialize object in JSON format. The actual serialization is handled by the
- * JSONProtocolSerializer.
- * @param {boolean} details Indicate level of details to include
- * @return {string} JSON serialization
- */
-Mirror.prototype.toJSONProtocol = function(details) {
-  var serializer = new JSONProtocolSerializer(details)
-  return serializer.serialize(this)
-}
-
-
 Mirror.prototype.toText = function() {
   // Simpel to text which is used when on specialization in subclass.
   return "#<" + builtins.GetInstanceName(this.constructor.name) + ">";
@@ -316,11 +357,17 @@ Mirror.prototype.toText = function() {
  */
 function ValueMirror(type, value) {
   Mirror.call(this, type);
+  this.handle_ = next_handle_++;
   this.value_ = value;
 }
 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
@@ -335,7 +382,7 @@ ValueMirror.prototype.isPrimitive = function() {
 };
 
 
- /**
+/**
  * Get the actual value reflected by this mirror.
  * @return {value} The value reflected by this mirror
  */
@@ -581,7 +628,7 @@ ObjectMirror.prototype.property = function(name) {
   }
 
   // Nothing found.
-  return new UndefinedMirror();
+  return GetUndefinedMirror();
 };
 
 
@@ -608,7 +655,7 @@ ObjectMirror.prototype.lookupProperty = function(value) {
   }
 
   // Nothing found.
-  return new UndefinedMirror();
+  return GetUndefinedMirror();
 };
 
 
@@ -687,8 +734,6 @@ FunctionMirror.prototype.source = function() {
   // Return source if function is resolved. Otherwise just fall through to
   // return undefined.
   if (this.resolved()) {
-    // This builtins function is context independant (only uses runtime
-    // calls and typeof.
     return builtins.FunctionSourceString(this.value_);
   }
 };
@@ -763,17 +808,17 @@ UnresolvedFunctionMirror.prototype.className = function() {
 
 
 UnresolvedFunctionMirror.prototype.constructorFunction = function() {
-  return new UndefinedMirror();
+  return GetUndefinedMirror();
 };
 
 
 UnresolvedFunctionMirror.prototype.prototypeObject = function() {
-  return new UndefinedMirror();
+  return GetUndefinedMirror();
 };
 
 
 UnresolvedFunctionMirror.prototype.protoObject = function() {
-  return new UndefinedMirror();
+  return GetUndefinedMirror();
 };
 
 
@@ -815,7 +860,7 @@ ArrayMirror.prototype.indexedPropertiesFromRange = function(opt_from_index, opt_
     if (details) {
       value = new PropertyMirror(this, i, details);
     } else {
-      value = new UndefinedMirror();
+      value = GetUndefinedMirror();
     }
     values[i - from_index] = value;
   }
@@ -1225,7 +1270,7 @@ FrameMirror.prototype.func = function() {
   // value returned from the VM might be a string if the function for the
   // frame is unresolved.
   if (IS_FUNCTION(f)) {
-    return new FunctionMirror(f);
+    return MakeMirror(f);
   } else {
     return new UnresolvedFunctionMirror(f);
   }
@@ -1345,7 +1390,7 @@ FrameMirror.prototype.invocationText = function() {
     }
     // Try to find the function as a property in the receiver. Include the
     // prototype chain in the lookup.
-    var property = new UndefinedMirror();
+    var property = GetUndefinedMirror();
     if (!receiver.isUndefined()) {
       for (var r = receiver; !r.isNull() && property.isUndefined(); r = r.protoObject()) {
         property = r.lookupProperty(func);
@@ -1526,16 +1571,107 @@ ScriptMirror.prototype.toText = function() {
 }
 
 
+/**
+ * Returns a mirror serializer
+ *
+ * @param {boolean} details Set to true to include details
+ * @returns {MirrorSerializer} mirror serializer
+ */
+function MakeMirrorSerializer(details) {
+  return new JSONProtocolSerializer(details);
+}
+
+
+/**
+ * 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) {
   this.details_ = details;
+  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 {String} JSON serialization
+ */
+JSONProtocolSerializer.prototype.serializeReferencedObjects = function() {
+  // Collect the JSON serialization of the referenced objects in an array.
+  var content = new Array();
+  
+  // 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));
+  }
+
+  var json = ArrayToJSONArray_(content);
+  return json;
 }
 
 
-JSONProtocolSerializer.prototype.serialize = function(mirror) {
-  // Collect the JSON property/value pairs in a array.
+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);
+}
+
+
+JSONProtocolSerializer.prototype.serialize_ = function(mirror, reference,
+                                                       details) {
+  // If serializing a reference to a value just return the reference and add the
+  // mirror to the referenced mirrors.
+  if (reference && mirror.isValue()) {
+    this.add_(mirror);
+    return '{ref:' + mirror.handle() + '}';
+  }
+  
+  // Collect the JSON property/value pairs in an array.
   var content = new Array();
 
-  // Always add the type  
+  // Add the handle for value mirrors.
+  if (mirror.isValue()) {
+    content.push(MakeJSONPair_('handle', NumberToJSON_(mirror.handle())));
+  }
+
+  // Always add the type.
   content.push(MakeJSONPair_('type', StringToJSON_(mirror.type())));
 
   switch (mirror.type()) {
@@ -1573,35 +1709,11 @@ JSONProtocolSerializer.prototype.serialize = function(mirror) {
     case ERROR_TYPE:
     case REGEXP_TYPE:
       // Add object representation.
-      this.serializeObject_(mirror, content);
+      this.serializeObject_(mirror, content, details);
       break;
 
     case PROPERTY_TYPE:
-      // Properties are represented by name, value, attributes and type.
-      content.push(MakeJSONPair_('name',
-                                 StringToJSON_(mirror.name())));
-      content.push(MakeJSONPair_('value',
-                                 mirror.value().toJSONProtocol(this.details_)));
-      if (mirror.attributes() != PropertyAttribute.None) {
-        content.push(MakeJSONPair_('attributes',
-                                   NumberToJSON_(mirror.attributes())));
-      }
-      if (mirror.propertyType() != PropertyType.Normal) {
-        content.push(MakeJSONPair_('propertyType',
-                                   NumberToJSON_(mirror.propertyType())));
-      }
-      break;
-
-    case ACCESSOR_TYPE:
-      // An accessor can either be native or defined through JavaScript.
-      if (mirror.isNative()) {
-        content.push(MakeJSONPair_('native', BooleanToJSON_(true)));
-      } else {
-        content.push(MakeJSONPair_('getter',
-                                   mirror.getter().toJSONProtocol(false)));
-        content.push(MakeJSONPair_('setter',
-                                   mirror.setter().toJSONProtocol(false)));
-      }
+      throw new Error('PropertyMirror cannot be serialized independeltly')
       break;
 
     case FRAME_TYPE:
@@ -1623,7 +1735,6 @@ JSONProtocolSerializer.prototype.serialize = function(mirror) {
       content.push(MakeJSONPair_('scriptType',
                                  NumberToJSON_(mirror.scriptType())));
       break;
-
   }
 
   // Always add the text representation.
@@ -1634,86 +1745,121 @@ JSONProtocolSerializer.prototype.serialize = function(mirror) {
 }
 
 
-JSONProtocolSerializer.prototype.serializeObject_ = function(mirror, 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>]}
+ */
+JSONProtocolSerializer.prototype.serializeObject_ = function(mirror, content,
+                                                             details) {
+  // Add general object properties.
   content.push(MakeJSONPair_('className',
                              StringToJSON_(mirror.className())));
-
-  if (this.details_) {
-    content.push(MakeJSONPair_('constructorFunction',
-        mirror.constructorFunction().toJSONProtocol(false)));
-    content.push(MakeJSONPair_('protoObject',
-                               mirror.protoObject().toJSONProtocol(false)));
-    content.push(MakeJSONPair_('prototypeObject',
-                               mirror.prototypeObject().toJSONProtocol(false)));
-
-    // Add properties. For arrays don't include indexed proeprties.
-    var kind = PropertyKind.Named;
-    if (!mirror.isArray()) {
-      kind |= PropertyKind.Indexed
-    }
-    var propertyNames = mirror.propertyNames(kind);
-    var x = new Array(propertyNames.length);
-    for (var i = 0; i < propertyNames.length; i++) {
-      x[i] = mirror.property(propertyNames[i]).toJSONProtocol(false);
-    }
-    content.push(MakeJSONPair_('properties', ArrayToJSONArray_(x)));
-
-    // For arrays the indexed properties are added separately and the length is
-    // added as well.
-    if (mirror.isArray()) {
-      var propertyNames = mirror.propertyNames(PropertyKind.Indexed);
-      var x = new Array(propertyNames.length);
-      for (var i = 0; i < propertyNames.length; i++) {
-        x[i] = mirror.property(propertyNames[i]).toJSONProtocol(false);
-      }
-      content.push(MakeJSONPair_('indexedProperties', ArrayToJSONArray_(x)));
-
-      // Add the array length.
-      content.push(MakeJSONPair_('length', NumberToJSON_(mirror.length())));
-    }
-  }
-
+  content.push(MakeJSONPair_('constructorFunction',
+      this.serializeReference(mirror.constructorFunction())));
+  content.push(MakeJSONPair_('protoObject',
+      this.serializeReference(mirror.protoObject())));
+  content.push(MakeJSONPair_('prototypeObject',
+      this.serializeReference(mirror.prototypeObject())));
+
+  // Add flags to indicate whether there are interceptors.
   if (mirror.hasNamedInterceptor()) {
     content.push(MakeJSONPair_('namedInterceptor', BooleanToJSON_(true)));
   }
-
   if (mirror.hasIndexedInterceptor()) {
     content.push(MakeJSONPair_('indexedInterceptor', BooleanToJSON_(true)));
   }
   
+  // Add function specific properties.
   if (mirror.isFunction()) {
     // Add function specific properties.
     content.push(MakeJSONPair_('name', StringToJSON_(mirror.name())));
     content.push(MakeJSONPair_('resolved', BooleanToJSON_(mirror.resolved())));
-    if (this.details_ && mirror.resolved()) {
+    if (mirror.resolved()) {
       content.push(MakeJSONPair_('source', StringToJSON_(mirror.source())));
     }
     if (mirror.script()) {
-      content.push(MakeJSONPair_('script', mirror.script().toJSONProtocol()));
+      content.push(MakeJSONPair_('script', this.serializeValue(mirror.script())));
     }
-  } else if (mirror.isDate()) {
+  }
+
+  // Add date specific properties.
+  if (mirror.isDate()) {
     // Add date specific properties.
     content.push(MakeJSONPair_('value', DateToJSON_(mirror.value())));
-  } else if (mirror.isRegExp()) {
-    // Add regexp specific properties.
-    content.push(MakeJSONPair_('source', StringToJSON_(mirror.source())));
-    content.push(MakeJSONPair_('global', BooleanToJSON_(mirror.global())));
-    content.push(MakeJSONPair_('ignoreCase',
-                               BooleanToJSON_(mirror.ignoreCase())));
-    content.push(MakeJSONPair_('multiline',
-                               BooleanToJSON_(mirror.multiline())));
-  } else if (mirror.isError()) {
-    // Add error specific properties.
-    content.push(MakeJSONPair_('message', StringToJSON_(mirror.message())));
   }
+
+  // Add actual properties - named properties followed by indexed properties.
+  var propertyNames = mirror.propertyNames(PropertyKind.Named);
+  var propertyIndexes = mirror.propertyNames(PropertyKind.Indexed);
+  var p = new Array(propertyNames.length + propertyIndexes.length);
+  for (var i = 0; i < propertyNames.length; i++) {
+    var property_mirror = mirror.property(propertyNames[i]);
+    p[i] = this.serializeProperty_(property_mirror);
+    if (details) {
+      this.add_(property_mirror.value());
+    }
+  }
+  for (var i = 0; i < propertyIndexes.length; i++) {
+    var property_mirror = mirror.property(propertyIndexes[i]);
+    p[propertyNames.length + i] = this.serializeProperty_(property_mirror);
+    if (details) {
+      this.add_(property_mirror.value());
+    }
+  }
+  content.push(MakeJSONPair_('properties', ArrayToJSONArray_(p)));
+}
+
+
+/**
+ * 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.
+ * If the propertyType for the property is PropertyType.Normal it is not added.
+ * Here are a couple of examples.
+ *
+ *   {"name":"hello","ref":1}
+ *   {"name":"length","attributes":7,"propertyType":3,"ref":2}
+ *
+ * @param {PropertyMirror} property_mirror The property to serialize
+ * @returns {String} JSON serialization
+ */
+JSONProtocolSerializer.prototype.serializeProperty_ = function(property_mirror) {
+  var builder = new builtins.StringBuilder();
+  builder.add('{"name":');
+  builder.add(StringToJSON_(property_mirror.name()));
+  if (property_mirror.attributes() != PropertyAttribute.None) {
+    builder.add(',"attributes":');
+    builder.add(NumberToJSON_(property_mirror.attributes()));
+  }
+  if (property_mirror.propertyType() != PropertyType.Normal) {
+    builder.add(',"propertyType":');
+    builder.add(NumberToJSON_(property_mirror.propertyType()));
+  }
+  builder.add(',"ref":');
+  builder.add(NumberToJSON_(property_mirror.value().handle()));
+  builder.add('}');
+  return builder.generate();
 }
 
 
 JSONProtocolSerializer.prototype.serializeFrame_ = function(mirror, content) {
   content.push(MakeJSONPair_('index', NumberToJSON_(mirror.index())));
   content.push(MakeJSONPair_('receiver',
-                             mirror.receiver().toJSONProtocol(false)));
-  content.push(MakeJSONPair_('func', mirror.func().toJSONProtocol(false)));
+                             this.serializeReference(mirror.receiver())));
+  content.push(MakeJSONPair_('func', this.serializeReference(mirror.func())));
   content.push(MakeJSONPair_('constructCall',
                              BooleanToJSON_(mirror.isConstructCall())));
   content.push(MakeJSONPair_('debuggerFrame',
@@ -1726,7 +1872,7 @@ JSONProtocolSerializer.prototype.serializeFrame_ = function(mirror, content) {
       arg.push(MakeJSONPair_('name', StringToJSON_(argument_name)));
     }
     arg.push(MakeJSONPair_('value',
-                           mirror.argumentValue(i).toJSONProtocol(false)));
+                           this.serializeReference(mirror.argumentValue(i))));
     x[i] = ArrayToJSONObject_(arg);
   }
   content.push(MakeJSONPair_('arguments', ArrayToJSONArray_(x)));
@@ -1734,7 +1880,7 @@ JSONProtocolSerializer.prototype.serializeFrame_ = function(mirror, content) {
   for (var i = 0; i < mirror.localCount(); i++) {
     var name = MakeJSONPair_('name', StringToJSON_(mirror.localName(i)));
     var value = MakeJSONPair_('value',
-                              mirror.localValue(i).toJSONProtocol(false));
+                              this.serializeReference(mirror.localValue(i)));
     x[i] = '{' + name + ',' + value + '}';
   }
   content.push(MakeJSONPair_('locals', ArrayToJSONArray_(x)));
diff --git a/test/mjsunit/debug-backtrace.js b/test/mjsunit/debug-backtrace.js
index 91e147620..db7a70a42 100644
--- a/test/mjsunit/debug-backtrace.js
+++ b/test/mjsunit/debug-backtrace.js
@@ -43,14 +43,33 @@ Debug = debug.Debug
 listenerCalled = false;
 exception = false;
 
-function safeEval(code) {
-  try {
-    return eval('(' + code + ')');
-  } catch (e) {
-    return undefined;
+
+function ParsedResponse(json) {
+  this.response_ = eval('(' + json + ')');
+  this.refs_ = [];
+  if (this.response_.refs) {
+    for (var i = 0; i < this.response_.refs.length; i++) {
+      this.refs_[this.response_.refs[i].handle] = this.response_.refs[i];
+    }
   }
 }
 
+
+ParsedResponse.prototype.response = function() {
+  return this.response_;
+}
+
+
+ParsedResponse.prototype.body = function() {
+  return this.response_.body;
+}
+
+
+ParsedResponse.prototype.lookup = function(handle) {
+  return this.refs_[handle];
+}
+
+
 function listener(event, exec_state, event_data, data) {
   try {
   if (event == Debug.DebugEvent.Break)
@@ -60,13 +79,19 @@ function listener(event, exec_state, event_data, data) {
     // 1: g
     // 2: [anonymous]
     
+    var response;
+    var backtrace;
+    var frame;
+    var source;
+    
     // Get the debug command processor.
     var dcp = exec_state.debugCommandProcessor();
 
     // Get the backtrace.
     var json;
     json = '{"seq":0,"type":"request","command":"backtrace"}'
-    var backtrace = safeEval(dcp.processDebugJSONRequest(json)).body;
+    response = new ParsedResponse(dcp.processDebugJSONRequest(json));
+    backtrace = response.body();
     assertEquals(0, backtrace.fromFrame);
     assertEquals(3, backtrace.toFrame);
     assertEquals(3, backtrace.totalFrames);
@@ -76,15 +101,16 @@ function listener(event, exec_state, event_data, data) {
       assertEquals('frame', frames[i].type);
     }
     assertEquals(0, frames[0].index);
-    assertEquals("f", frames[0].func.name);
+    assertEquals("f", response.lookup(frames[0].func.ref).name);
     assertEquals(1, frames[1].index);
-    assertEquals("g", frames[1].func.name);
+    assertEquals("g", response.lookup(frames[1].func.ref).name);
     assertEquals(2, frames[2].index);
-    assertEquals("", frames[2].func.name);
+    assertEquals("", response.lookup(frames[2].func.ref).name);
 
     // Get backtrace with two frames.
     json = '{"seq":0,"type":"request","command":"backtrace","arguments":{"fromFrame":1,"toFrame":3}}'
-    var backtrace = safeEval(dcp.processDebugJSONRequest(json)).body;
+    response = new ParsedResponse(dcp.processDebugJSONRequest(json));
+    backtrace = response.body();
     assertEquals(1, backtrace.fromFrame);
     assertEquals(3, backtrace.toFrame);
     assertEquals(3, backtrace.totalFrames);
@@ -94,71 +120,77 @@ function listener(event, exec_state, event_data, data) {
       assertEquals('frame', frames[i].type);
     }
     assertEquals(1, frames[0].index);
-    assertEquals("g", frames[0].func.name);
+    assertEquals("g", response.lookup(frames[0].func.ref).name);
     assertEquals(2, frames[1].index);
-    assertEquals("", frames[1].func.name);
+    assertEquals("", response.lookup(frames[1].func.ref).name);
 
     // Get the individual frames.
-    var frame;
     json = '{"seq":0,"type":"request","command":"frame"}'
-    frame = safeEval(dcp.processDebugJSONRequest(json)).body;
+    response = new ParsedResponse(dcp.processDebugJSONRequest(json));
+    frame = response.body();
     assertEquals(0, frame.index);
-    assertEquals("f", frame.func.name);
+    assertEquals("f", response.lookup(frame.func.ref).name);
     assertTrue(frame.constructCall);
     assertEquals(31, frame.line);
     assertEquals(3, frame.column);
     assertEquals(2, frame.arguments.length);
     assertEquals('x', frame.arguments[0].name);
-    assertEquals('number', frame.arguments[0].value.type);
-    assertEquals(1, frame.arguments[0].value.value);
+    assertEquals('number', response.lookup(frame.arguments[0].value.ref).type);
+    assertEquals(1, response.lookup(frame.arguments[0].value.ref).value);
     assertEquals('y', frame.arguments[1].name);
-    assertEquals('undefined', frame.arguments[1].value.type);
+    assertEquals('undefined', response.lookup(frame.arguments[1].value.ref).type);
 
     json = '{"seq":0,"type":"request","command":"frame","arguments":{"number":0}}'
-    frame = safeEval(dcp.processDebugJSONRequest(json)).body;
+    response = new ParsedResponse(dcp.processDebugJSONRequest(json));
+    frame = response.body();
     assertEquals(0, frame.index);
-    assertEquals("f", frame.func.name);
+    assertEquals("f", response.lookup(frame.func.ref).name);
     assertEquals(31, frame.line);
     assertEquals(3, frame.column);
     assertEquals(2, frame.arguments.length);
     assertEquals('x', frame.arguments[0].name);
-    assertEquals('number', frame.arguments[0].value.type);
-    assertEquals(1, frame.arguments[0].value.value);
+    assertEquals('number', response.lookup(frame.arguments[0].value.ref).type);
+    assertEquals(1, response.lookup(frame.arguments[0].value.ref).value);
     assertEquals('y', frame.arguments[1].name);
-    assertEquals('undefined', frame.arguments[1].value.type);
+    assertEquals('undefined', response.lookup(frame.arguments[1].value.ref).type);
 
     json = '{"seq":0,"type":"request","command":"frame","arguments":{"number":1}}'
-    frame = safeEval(dcp.processDebugJSONRequest(json)).body;
+    response = new ParsedResponse(dcp.processDebugJSONRequest(json));
+    frame = response.body();
     assertEquals(1, frame.index);
-    assertEquals("g", frame.func.name);
+    assertEquals("g", response.lookup(frame.func.ref).name);
     assertFalse(frame.constructCall);
     assertEquals(35, frame.line);
     assertEquals(2, frame.column);
     assertEquals(0, frame.arguments.length);
 
     json = '{"seq":0,"type":"request","command":"frame","arguments":{"number":2}}'
-    frame = safeEval(dcp.processDebugJSONRequest(json)).body;
+    response = new ParsedResponse(dcp.processDebugJSONRequest(json));
+    frame = response.body();
     assertEquals(2, frame.index);
-    assertEquals("", frame.func.name);
+    assertEquals("", response.lookup(frame.func.ref).name);
 
     // Source slices for the individual frames (they all refer to this script).
     json = '{"seq":0,"type":"request","command":"source",' +
             '"arguments":{"frame":0,"fromLine":30,"toLine":32}}'
-    source = safeEval(dcp.processDebugJSONRequest(json)).body;
+    response = new ParsedResponse(dcp.processDebugJSONRequest(json));
+    source = response.body();
     assertEquals("function f(x, y) {", source.source.substring(0, 18));
     assertEquals(30, source.fromLine);
     assertEquals(32, source.toLine);
     
     json = '{"seq":0,"type":"request","command":"source",' +
             '"arguments":{"frame":1,"fromLine":31,"toLine":32}}'
-    source = safeEval(dcp.processDebugJSONRequest(json)).body;
+    response = new ParsedResponse(dcp.processDebugJSONRequest(json));
+    source = response.body();
     assertEquals("  a=1;", source.source.substring(0, 6));
     assertEquals(31, source.fromLine);
     assertEquals(32, source.toLine);
     
     json = '{"seq":0,"type":"request","command":"source",' +
             '"arguments":{"frame":2,"fromLine":35,"toLine":36}}'
-    source = safeEval(dcp.processDebugJSONRequest(json)).body;
+    response = new ParsedResponse(dcp.processDebugJSONRequest(json));
+    source = response.body();
     assertEquals("  new f(1);", source.source.substring(0, 11));
     assertEquals(35, source.fromLine);
     assertEquals(36, source.toLine);
@@ -166,12 +198,13 @@ function listener(event, exec_state, event_data, data) {
     // Test line interval way beyond this script will result in an error.
     json = '{"seq":0,"type":"request","command":"source",' +
             '"arguments":{"frame":0,"fromLine":10000,"toLine":20000}}'
-    response = safeEval(dcp.processDebugJSONRequest(json));
-    assertFalse(response.success);
+    response = new ParsedResponse(dcp.processDebugJSONRequest(json));
+    assertFalse(response.response().success);
     
     // Test without arguments.
     json = '{"seq":0,"type":"request","command":"source"}'
-    source = safeEval(dcp.processDebugJSONRequest(json)).body;
+    response = new ParsedResponse(dcp.processDebugJSONRequest(json));
+    source = response.body();
     assertEquals(Debug.findScript(f).source, source.source);
     
     listenerCalled = true;
diff --git a/test/mjsunit/debug-mirror-cache.js b/test/mjsunit/debug-mirror-cache.js
new file mode 100644
index 000000000..0dc040517
--- /dev/null
+++ b/test/mjsunit/debug-mirror-cache.js
@@ -0,0 +1,85 @@
+// Copyright 2008 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --expose-debug-as debug
+// The functions used for testing backtraces. They are at the top to make the
+// testing of source line/column easier.
+function f(x, y) {
+  a=1;
+};
+
+function g() {
+  new f(1);
+};
+
+
+// Get the Debug object exposed from the debug context global object.
+Debug = debug.Debug
+
+listenerCallCount = 0;
+listenerExceptionCount = 0;
+
+
+function listener(event, exec_state, event_data, data) {
+  try {
+  if (event == Debug.DebugEvent.Break)
+  {
+    listenerCallCount++;
+
+    // Check that mirror cache is cleared when entering debugger.
+    assertEquals(0, debug.next_handle_, "Mirror cache not cleared");
+    assertEquals(0, debug.mirror_cache_.length, "Mirror cache not cleared");
+
+    // Get the debug command processor.
+    var dcp = exec_state.debugCommandProcessor();
+
+    // Make a backtrace request to create some mirrors.
+    var json;
+    json = '{"seq":0,"type":"request","command":"backtrace"}'
+    dcp.processDebugJSONRequest(json);
+
+    // Some mirrors where cached.
+    assertFalse(debug.next_handle_ == 0, "Mirror cache not used");
+    assertFalse(debug.mirror_cache_.length == 0, "Mirror cache not used");
+  }
+  } catch (e) {
+    print(e);
+    listenerExceptionCount++;
+  };
+};
+
+// Add the debug event listener.
+Debug.addListener(listener);
+
+// Enter the debugger twice.
+debugger;
+debugger;
+
+// Make sure that the debug event listener vas invoked.
+assertEquals(2, listenerCallCount, "Listener not called");
+assertEquals(0, listenerExceptionCount, "Exception in listener");
+
diff --git a/test/mjsunit/mirror-array.js b/test/mjsunit/mirror-array.js
index 93c87bdfc..1873d1eb6 100644
--- a/test/mjsunit/mirror-array.js
+++ b/test/mjsunit/mirror-array.js
@@ -28,50 +28,80 @@
 // Flags: --expose-debug-as debug
 // Test the mirror object for objects
 
+function MirrorRefCache(json_refs) {
+  var tmp = eval('(' + json_refs + ')');
+  this.refs_ = [];
+  for (var i = 0; i < tmp.length; i++) {
+    this.refs_[tmp[i].handle] = tmp[i];
+  }
+}
+
+MirrorRefCache.prototype.lookup = function(handle) {
+  return this.refs_[handle];
+}
+
 function testArrayMirror(a, names) {
   // Create mirror and JSON representation.
   var mirror = debug.MakeMirror(a);
-  var json = mirror.toJSONProtocol(true);
+  var serializer = debug.MakeMirrorSerializer();
+  var json = serializer.serializeValue(mirror);
+  var refs = new MirrorRefCache(serializer.serializeReferencedObjects());
 
   // Check the mirror hierachy.
-  assertTrue(mirror instanceof debug.Mirror);
-  assertTrue(mirror instanceof debug.ValueMirror);
-  assertTrue(mirror instanceof debug.ObjectMirror);
-  assertTrue(mirror instanceof debug.ArrayMirror);
+  assertTrue(mirror instanceof debug.Mirror, 'Unexpected mirror hierachy');
+  assertTrue(mirror instanceof debug.ValueMirror, 'Unexpected mirror hierachy');
+  assertTrue(mirror instanceof debug.ObjectMirror, 'Unexpected mirror hierachy');
+  assertTrue(mirror instanceof debug.ArrayMirror, 'Unexpected mirror hierachy');
 
   // Check the mirror properties.
-  assertTrue(mirror.isArray());
-  assertEquals('object', mirror.type());
-  assertFalse(mirror.isPrimitive());
-  assertEquals('Array', mirror.className());
-  assertTrue(mirror.constructorFunction() instanceof debug.ObjectMirror);
-  assertTrue(mirror.protoObject() instanceof debug.Mirror);
-  assertTrue(mirror.prototypeObject() instanceof debug.Mirror);
+  assertTrue(mirror.isArray(), 'Unexpected mirror');
+  assertEquals('object', mirror.type(), 'Unexpected mirror type');
+  assertFalse(mirror.isPrimitive(), 'Unexpected primitive mirror');
+  assertEquals('Array', mirror.className(), 'Unexpected mirror class name');
+  assertTrue(mirror.constructorFunction() instanceof debug.ObjectMirror, 'Unexpected mirror hierachy');
+  assertEquals('Array', mirror.constructorFunction().name(), 'Unexpected constructor function name');
+  assertTrue(mirror.protoObject() instanceof debug.Mirror, 'Unexpected mirror hierachy');
+  assertTrue(mirror.prototypeObject() instanceof debug.Mirror, 'Unexpected mirror hierachy');
   assertEquals(mirror.length(), a.length, "Length mismatch");
   
-  var indexedValueMirrors = mirror.indexedPropertiesFromRange();
-  assertEquals(indexedValueMirrors.length, a.length);
-  for (var i = 0; i < indexedValueMirrors.length; i++) {
-    assertTrue(indexedValueMirrors[i] instanceof debug.Mirror);
-    if (a[i]) {
-      assertTrue(indexedValueMirrors[i] instanceof debug.PropertyMirror);
-    }
+  var indexedProperties = mirror.indexedPropertiesFromRange();
+  assertEquals(indexedProperties.length, a.length);
+  for (var i = 0; i < indexedProperties.length; i++) {
+    assertTrue(indexedProperties[i] instanceof debug.Mirror, 'Unexpected mirror hierachy');
+    assertTrue(indexedProperties[i] instanceof debug.PropertyMirror, 'Unexpected mirror hierachy');
   }
 
   // Parse JSON representation and check.
   var fromJSON = eval('(' + json + ')');
-  assertEquals('object', fromJSON.type);
-  assertEquals('Array', fromJSON.className);
-  assertEquals('function', fromJSON.constructorFunction.type);
-  assertEquals('Array', fromJSON.constructorFunction.name);
-  assertEquals(a.length, fromJSON.length, "Length mismatch in parsed JSON");
+  assertEquals('object', fromJSON.type, 'Unexpected mirror type in JSON');
+  assertEquals('Array', fromJSON.className, 'Unexpected mirror class name in JSON');
+  assertEquals(mirror.constructorFunction().handle(), fromJSON.constructorFunction.ref, 'Unexpected constructor function handle in JSON');
+  assertEquals('function', refs.lookup(fromJSON.constructorFunction.ref).type, 'Unexpected constructor function type in JSON');
+  assertEquals('Array', refs.lookup(fromJSON.constructorFunction.ref).name, 'Unexpected constructor function name in JSON');
+  assertEquals(void 0, fromJSON.namedInterceptor, 'No named interceptor expected in JSON');
+  assertEquals(void 0, fromJSON.indexedInterceptor, 'No indexed interceptor expected in JSON');
 
-  // Check that the serialization contains all indexed properties.
-  for (var i = 0; i < fromJSON.indexedProperties.length; i++) {
-    var index = fromJSON.indexedProperties[i].name;
-    assertEquals(indexedValueMirrors[index].name(), index);
-    assertEquals(indexedValueMirrors[index].value().type(), fromJSON.indexedProperties[i].value.type, index);
+  // Check that the serialization contains all indexed properties and the length property.
+  var length_found = false;
+  for (var i = 0; i < fromJSON.properties.length; i++) {
+    if (fromJSON.properties[i].name == 'length') {
+      length_found = true;
+      assertEquals('number', refs.lookup(fromJSON.properties[i].ref).type, "Unexpected type of the length property");
+      assertEquals(a.length, refs.lookup(fromJSON.properties[i].ref).value, "Length mismatch in parsed JSON");
+    } else {
+      var index = parseInt(fromJSON.properties[i].name);
+        print(index);
+      if (!isNaN(index)) {
+        print(index);
+        // This test assumes that the order of the indexeed properties is in the
+        // same order in the serialization as returned from
+        // indexedPropertiesFromRange()
+        assertEquals(indexedProperties[index].name(), index);
+        assertEquals(indexedProperties[index].value().type(), refs.lookup(fromJSON.properties[i].ref).type, 'Unexpected serialized type');
+      }
+    }
   }
+  assertTrue(length_found, 'Property length not found');
 
   // Check that the serialization contains all names properties.
   if (names) {
@@ -84,8 +114,6 @@ function testArrayMirror(a, names) {
       }
       assertTrue(found, names[i])
     }
-  } else {
-    assertEquals(1, fromJSON.properties.length)
   }
 }
 
diff --git a/test/mjsunit/mirror-boolean.js b/test/mjsunit/mirror-boolean.js
index 214704812..4f9308924 100644
--- a/test/mjsunit/mirror-boolean.js
+++ b/test/mjsunit/mirror-boolean.js
@@ -31,7 +31,8 @@
 function testBooleanMirror(b) {
   // Create mirror and JSON representation.
   var mirror = debug.MakeMirror(b);
-  var json = mirror.toJSONProtocol(true);
+  var serializer = debug.MakeMirrorSerializer();
+  var json = serializer.serializeValue(mirror);
 
   // Check the mirror hierachy.
   assertTrue(mirror instanceof debug.Mirror);
diff --git a/test/mjsunit/mirror-date.js b/test/mjsunit/mirror-date.js
index e96badcfc..a6334d0f1 100644
--- a/test/mjsunit/mirror-date.js
+++ b/test/mjsunit/mirror-date.js
@@ -31,7 +31,8 @@
 function testDateMirror(d, iso8601) {
   // Create mirror and JSON representation.
   var mirror = debug.MakeMirror(d);
-  var json = mirror.toJSONProtocol(true);
+  var serializer = debug.MakeMirrorSerializer();
+  var json = serializer.serializeValue(mirror);
 
   // Check the mirror hierachy.
   assertTrue(mirror instanceof debug.Mirror);
diff --git a/test/mjsunit/mirror-error.js b/test/mjsunit/mirror-error.js
index 49eaaff7f..37ec46c86 100644
--- a/test/mjsunit/mirror-error.js
+++ b/test/mjsunit/mirror-error.js
@@ -28,10 +28,24 @@
 // Flags: --expose-debug-as debug
 // Test the mirror object for regular error objects
 
+function MirrorRefCache(json_refs) {
+  var tmp = eval('(' + json_refs + ')');
+  this.refs_ = [];
+  for (var i = 0; i < tmp.length; i++) {
+    this.refs_[tmp[i].handle] = tmp[i];
+  }
+}
+
+MirrorRefCache.prototype.lookup = function(handle) {
+  return this.refs_[handle];
+}
+
 function testErrorMirror(e) {
   // Create mirror and JSON representation.
   var mirror = debug.MakeMirror(e);
-  var json = mirror.toJSONProtocol(true);
+  var serializer = debug.MakeMirrorSerializer();
+  var json = serializer.serializeValue(mirror);
+  var refs = new MirrorRefCache(serializer.serializeReferencedObjects());
 
   // Check the mirror hierachy.
   assertTrue(mirror instanceof debug.Mirror);
@@ -49,7 +63,18 @@ function testErrorMirror(e) {
   var fromJSON = eval('(' + json + ')');
   assertEquals('error', fromJSON.type);
   assertEquals('Error', fromJSON.className);
-  assertEquals(fromJSON.message, e.message, 'message');
+  if (e.message) {
+    var found_message = false;
+    for (var i in fromJSON.properties) {
+      var p = fromJSON.properties[i];
+      print(p.name);
+      if (p.name == 'message') {
+        assertEquals(e.message, refs.lookup(p.ref).value);
+        found_message = true;
+      }
+    }
+    assertTrue(found_message, 'Property message not found');
+  }
   
   // Check the formatted text (regress 1231579).
   assertEquals(fromJSON.text, e.toString(), 'toString');
diff --git a/test/mjsunit/mirror-function.js b/test/mjsunit/mirror-function.js
index 43ff50f06..59d9e7862 100644
--- a/test/mjsunit/mirror-function.js
+++ b/test/mjsunit/mirror-function.js
@@ -28,10 +28,24 @@
 // Flags: --expose-debug-as debug
 // Test the mirror object for functions.
 
+function MirrorRefCache(json_refs) {
+  var tmp = eval('(' + json_refs + ')');
+  this.refs_ = [];
+  for (var i = 0; i < tmp.length; i++) {
+    this.refs_[tmp[i].handle] = tmp[i];
+  }
+}
+
+MirrorRefCache.prototype.lookup = function(handle) {
+  return this.refs_[handle];
+}
+
 function testFunctionMirror(f) {
   // Create mirror and JSON representation.
   var mirror = debug.MakeMirror(f);
-  var json = mirror.toJSONProtocol(true);
+  var serializer = debug.MakeMirrorSerializer();
+  var json = serializer.serializeValue(mirror);
+  var refs = new MirrorRefCache(serializer.serializeReferencedObjects());
 
   // Check the mirror hierachy.
   assertTrue(mirror instanceof debug.Mirror);
@@ -58,8 +72,8 @@ function testFunctionMirror(f) {
   var fromJSON = eval('(' + json + ')');
   assertEquals('function', fromJSON.type);
   assertEquals('Function', fromJSON.className);
-  assertEquals('function', fromJSON.constructorFunction.type);
-  assertEquals('Function', fromJSON.constructorFunction.name);
+  assertEquals('function', refs.lookup(fromJSON.constructorFunction.ref).type);
+  assertEquals('Function', refs.lookup(fromJSON.constructorFunction.ref).name);
   assertTrue(fromJSON.resolved);
   assertEquals(f.name, fromJSON.name);
   assertEquals(f.toString(), fromJSON.source);
diff --git a/test/mjsunit/mirror-null.js b/test/mjsunit/mirror-null.js
index 4233efae2..db68966a4 100644
--- a/test/mjsunit/mirror-null.js
+++ b/test/mjsunit/mirror-null.js
@@ -30,7 +30,8 @@
 
 // Create mirror and JSON representation.
 var mirror = debug.MakeMirror(null);
-var json = mirror.toJSONProtocol(true);
+var serializer = debug.MakeMirrorSerializer();
+var json = serializer.serializeValue(mirror);
 
 // Check the mirror hierachy.
 assertTrue(mirror instanceof debug.Mirror);
diff --git a/test/mjsunit/mirror-number.js b/test/mjsunit/mirror-number.js
index 20280c3b3..33488efcb 100644
--- a/test/mjsunit/mirror-number.js
+++ b/test/mjsunit/mirror-number.js
@@ -31,7 +31,8 @@
 function testNumberMirror(n) {
   // Create mirror and JSON representation.
   var mirror = debug.MakeMirror(n);
-  var json = mirror.toJSONProtocol(true);
+  var serializer = debug.MakeMirrorSerializer();
+  var json = serializer.serializeValue(mirror);
 
   // Check the mirror hierachy.
   assertTrue(mirror instanceof debug.Mirror);
diff --git a/test/mjsunit/mirror-object.js b/test/mjsunit/mirror-object.js
index 5f86acdfd..b9b0e1a9e 100644
--- a/test/mjsunit/mirror-object.js
+++ b/test/mjsunit/mirror-object.js
@@ -28,38 +28,53 @@
 // Flags: --expose-debug-as debug
 // Test the mirror object for objects
 
-function testObjectMirror(o, cls_name, ctor_name, hasSpecialProperties) {
+function MirrorRefCache(json_refs) {
+  var tmp = eval('(' + json_refs + ')');
+  this.refs_ = [];
+  for (var i = 0; i < tmp.length; i++) {
+    this.refs_[tmp[i].handle] = tmp[i];
+  }
+}
+
+MirrorRefCache.prototype.lookup = function(handle) {
+  return this.refs_[handle];
+}
+
+function testObjectMirror(obj, cls_name, ctor_name, hasSpecialProperties) {
   // Create mirror and JSON representation.
-  var mirror = debug.MakeMirror(o);
-  var json = mirror.toJSONProtocol(true);
+  var mirror = debug.MakeMirror(obj);
+  var serializer = debug.MakeMirrorSerializer();
+  var json = serializer.serializeValue(mirror);
+  var refs = new MirrorRefCache(serializer.serializeReferencedObjects());
 
   // Check the mirror hierachy.
-  assertTrue(mirror instanceof debug.Mirror);
-  assertTrue(mirror instanceof debug.ValueMirror);
-  assertTrue(mirror instanceof debug.ObjectMirror);
+  assertTrue(mirror instanceof debug.Mirror, 'Unexpected mirror hierachy');
+  assertTrue(mirror instanceof debug.ValueMirror, 'Unexpected mirror hierachy');
+  assertTrue(mirror instanceof debug.ObjectMirror, 'Unexpected mirror hierachy');
 
   // Check the mirror properties.
-  assertTrue(mirror.isObject());
-  assertEquals('object', mirror.type());
-  assertFalse(mirror.isPrimitive());
-  assertEquals(cls_name, mirror.className());
-  assertTrue(mirror.constructorFunction() instanceof debug.ObjectMirror);
-  assertTrue(mirror.protoObject() instanceof debug.Mirror);
-  assertTrue(mirror.prototypeObject() instanceof debug.Mirror);
-  assertFalse(mirror.hasNamedInterceptor(), "hasNamedInterceptor()");
-  assertFalse(mirror.hasIndexedInterceptor(), "hasIndexedInterceptor()");
+  assertTrue(mirror.isObject(), 'Unexpected mirror');
+  assertEquals('object', mirror.type(), 'Unexpected mirror type');
+  assertFalse(mirror.isPrimitive(), 'Unexpected primitive mirror');
+  assertEquals(cls_name, mirror.className(), 'Unexpected mirror class name');
+  assertTrue(mirror.constructorFunction() instanceof debug.ObjectMirror, 'Unexpected mirror hierachy');
+  assertEquals(ctor_name, mirror.constructorFunction().name(), 'Unexpected constructor function name');
+  assertTrue(mirror.protoObject() instanceof debug.Mirror, 'Unexpected mirror hierachy');
+  assertTrue(mirror.prototypeObject() instanceof debug.Mirror, 'Unexpected mirror hierachy');
+  assertFalse(mirror.hasNamedInterceptor(), 'No named interceptor expected');
+  assertFalse(mirror.hasIndexedInterceptor(), 'No indexed interceptor expected');
 
   var names = mirror.propertyNames();
   var properties = mirror.properties()
   assertEquals(names.length, properties.length);
   for (var i = 0; i < properties.length; i++) {
-    assertTrue(properties[i] instanceof debug.Mirror);
-    assertTrue(properties[i] instanceof debug.PropertyMirror);
-    assertEquals('property', properties[i].type());
-    assertEquals(names[i], properties[i].name());
+    assertTrue(properties[i] instanceof debug.Mirror, 'Unexpected mirror hierachy');
+    assertTrue(properties[i] instanceof debug.PropertyMirror, 'Unexpected mirror hierachy');
+    assertEquals('property', properties[i].type(), 'Unexpected mirror type');
+    assertEquals(names[i], properties[i].name(), 'Unexpected property name');
   }
   
-  for (var p in o) {
+  for (var p in obj) {
     var property_mirror = mirror.property(p);
     assertTrue(property_mirror instanceof debug.PropertyMirror);
     assertEquals(p, property_mirror.name());
@@ -74,46 +89,55 @@ function testObjectMirror(o, cls_name, ctor_name, hasSpecialProperties) {
 
   // Parse JSON representation and check.
   var fromJSON = eval('(' + json + ')');
-  assertEquals('object', fromJSON.type);
-  assertEquals(cls_name, fromJSON.className);
-  assertEquals('function', fromJSON.constructorFunction.type);
-  if (ctor_name !== undefined)
-    assertEquals(ctor_name, fromJSON.constructorFunction.name);
-  assertEquals(void 0, fromJSON.namedInterceptor);
-  assertEquals(void 0, fromJSON.indexedInterceptor);
-
-  // For array the index properties are seperate from named properties.
-  if (!cls_name == 'Array') {
-    assertEquals(names.length, fromJSON.properties.length, 'Some properties missing in JSON');
-  }
+  assertEquals('object', fromJSON.type, 'Unexpected mirror type in JSON');
+  assertEquals(cls_name, fromJSON.className, 'Unexpected mirror class name in JSON');
+  assertEquals(mirror.constructorFunction().handle(), fromJSON.constructorFunction.ref, 'Unexpected constructor function handle in JSON');
+  assertEquals('function', refs.lookup(fromJSON.constructorFunction.ref).type, 'Unexpected constructor function type in JSON');
+  assertEquals(ctor_name, refs.lookup(fromJSON.constructorFunction.ref).name, 'Unexpected constructor function name in JSON');
+  assertEquals(mirror.protoObject().handle(), fromJSON.protoObject.ref, 'Unexpected proto object handle in JSON');
+  assertEquals(mirror.protoObject().type(), refs.lookup(fromJSON.protoObject.ref).type, 'Unexpected proto object type in JSON');
+  assertEquals(mirror.prototypeObject().handle(), fromJSON.prototypeObject.ref, 'Unexpected prototype object handle in JSON');
+  assertEquals(mirror.prototypeObject().type(), refs.lookup(fromJSON.prototypeObject.ref).type, 'Unexpected prototype object type in JSON');
+  assertEquals(void 0, fromJSON.namedInterceptor, 'No named interceptor expected in JSON');
+  assertEquals(void 0, fromJSON.indexedInterceptor, 'No indexed interceptor expected in JSON');
 
   // Check that the serialization contains all properties.
+  assertEquals(names.length, fromJSON.properties.length, 'Some properties missing in JSON');
   for (var i = 0; i < fromJSON.properties.length; i++) {
     var name = fromJSON.properties[i].name;
     if (!name) name = fromJSON.properties[i].index;
     var found = false;
     for (var j = 0; j < names.length; j++) {
       if (names[j] == name) {
-        assertEquals(properties[i].value().type(), fromJSON.properties[i].value.type);
-        // If property type is normal nothing is serialized.
+        // Check that serialized handle is correct.
+        assertEquals(properties[i].value().handle(), fromJSON.properties[i].ref, 'Unexpected serialized handle');
+
+        // Check that serialized name is correct.
+        assertEquals(properties[i].name(), fromJSON.properties[i].name, 'Unexpected serialized name');
+
+        // If property type is normal property type is not serialized.
         if (properties[i].propertyType() != debug.PropertyType.Normal) {
-          assertEquals(properties[i].propertyType(), fromJSON.properties[i].propertyType);
+          assertEquals(properties[i].propertyType(), fromJSON.properties[i].propertyType, 'Unexpected serialized property type');
         } else {
-          assertTrue(typeof(fromJSON.properties[i].propertyType) === 'undefined');
+          assertTrue(typeof(fromJSON.properties[i].propertyType) === 'undefined', 'Unexpected serialized property type');
         }
-        // If there are no attributes nothing is serialized.
+
+        // If there are no attributes attributes are not serialized.
         if (properties[i].attributes() != debug.PropertyAttribute.None) {
-          assertEquals(properties[i].attributes(), fromJSON.properties[i].attributes);
+          assertEquals(properties[i].attributes(), fromJSON.properties[i].attributes, 'Unexpected serialized attributes');
         } else {
-          assertTrue(typeof(fromJSON.properties[i].attributes) === 'undefined');
+          assertTrue(typeof(fromJSON.properties[i].attributes) === 'undefined', 'Unexpected serialized attributes');
         }
-        if (!properties[i].value().isPrimitive()) {
-          // NaN is not equal to NaN.
-          if (isNaN(properties[i].value().value())) {
-            assertTrue(isNaN(fromJSON.properties[i].value.value));
-          } else {
-            assertEquals(properties[i].value().value(), fromJSON.properties[i].value.value);
-          }
+
+        // Lookup the serialized object from the handle reference.        
+        var o = refs.lookup(fromJSON.properties[i].ref);
+        assertTrue(o != void 0, 'Referenced object is not serialized');
+
+        assertEquals(properties[i].value().type(), o.type, 'Unexpected serialized property type for ' + name);
+        if (properties[i].value().isPrimitive()) {
+          assertEquals(properties[i].value().value(), o.value, 'Unexpected serialized property value for ' + name);
+        } else if (properties[i].value().isFunction()) {
+          assertEquals(properties[i].value().source(), o.source, 'Unexpected serialized property value for ' + name);
         }
         found = true;
       }
@@ -134,7 +158,7 @@ testObjectMirror({}, 'Object', 'Object');
 testObjectMirror({'a':1,'b':2}, 'Object', 'Object');
 testObjectMirror({'1':void 0,'2':null,'f':function pow(x,y){return Math.pow(x,y);}}, 'Object', 'Object');
 testObjectMirror(new Point(-1.2,2.003), 'Object', 'Point');
-testObjectMirror(this, 'global', undefined, true);  // Global object has special properties
+testObjectMirror(this, 'global', '', true);  // Global object has special properties
 testObjectMirror([], 'Array', 'Array');
 testObjectMirror([1,2], 'Array', 'Array');
 
diff --git a/test/mjsunit/mirror-regexp.js b/test/mjsunit/mirror-regexp.js
index 443caeb60..0490b17f0 100644
--- a/test/mjsunit/mirror-regexp.js
+++ b/test/mjsunit/mirror-regexp.js
@@ -39,10 +39,24 @@ var expected_attributes = {
   'lastIndex': debug.PropertyAttribute.DontEnum | debug.PropertyAttribute.DontDelete
 };
 
+function MirrorRefCache(json_refs) {
+  var tmp = eval('(' + json_refs + ')');
+  this.refs_ = [];
+  for (var i = 0; i < tmp.length; i++) {
+    this.refs_[tmp[i].handle] = tmp[i];
+  }
+}
+
+MirrorRefCache.prototype.lookup = function(handle) {
+  return this.refs_[handle];
+}
+
 function testRegExpMirror(r) {
   // Create mirror and JSON representation.
   var mirror = debug.MakeMirror(r);
-  var json = mirror.toJSONProtocol(true);
+  var serializer = debug.MakeMirrorSerializer();
+  var json = serializer.serializeValue(mirror);
+  var refs = new MirrorRefCache(serializer.serializeReferencedObjects());
 
   // Check the mirror hierachy.
   assertTrue(mirror instanceof debug.Mirror);
@@ -54,10 +68,6 @@ function testRegExpMirror(r) {
   assertTrue(mirror.isRegExp());
   assertEquals('regexp', mirror.type());
   assertFalse(mirror.isPrimitive());
-  assertEquals(mirror.source(), r.source, 'source');
-  assertEquals(mirror.global(), r.global, 'global');
-  assertEquals(mirror.ignoreCase(), r.ignoreCase, 'ignoreCase');
-  assertEquals(mirror.multiline(), r.multiline, 'multiline');
   for (var p in expected_attributes) {
     assertEquals(mirror.property(p).attributes(),
                  expected_attributes[p],
@@ -71,16 +81,21 @@ function testRegExpMirror(r) {
   var fromJSON = eval('(' + json + ')');
   assertEquals('regexp', fromJSON.type);
   assertEquals('RegExp', fromJSON.className);
-  assertEquals(fromJSON.source, r.source, 'source');
-  assertEquals(fromJSON.global, r.global, 'global');
-  assertEquals(fromJSON.ignoreCase, r.ignoreCase, 'ignoreCase');
-  assertEquals(fromJSON.multiline, r.multiline, 'multiline');
   for (var p in expected_attributes) {
     for (var i = 0; i < fromJSON.properties.length; i++) {
       if (fromJSON.properties[i].name == p) {
-        assertEquals(fromJSON.properties[i].attributes,
-                     expected_attributes[p],
-                     p + ' attributes');
+        assertEquals(expected_attributes[p],
+                     fromJSON.properties[i].attributes,
+                     'Unexpected value for ' + p + ' attributes');
+        assertEquals(mirror.property(p).propertyType(),
+                     fromJSON.properties[i].propertyType,
+                     'Unexpected value for ' + p + ' propertyType');
+        assertEquals(mirror.property(p).value().handle(),
+                     fromJSON.properties[i].ref,
+                     'Unexpected handle for ' + p);
+        assertEquals(mirror.property(p).value().value(),
+                     refs.lookup(fromJSON.properties[i].ref).value,
+                     'Unexpected value for ' + p);
       }
     }
   }
diff --git a/test/mjsunit/mirror-script.js b/test/mjsunit/mirror-script.js
index 0034829a8..c02964550 100644
--- a/test/mjsunit/mirror-script.js
+++ b/test/mjsunit/mirror-script.js
@@ -31,8 +31,8 @@
 function testScriptMirror(f, file_name, file_lines, script_type) {
   // Create mirror and JSON representation.
   var mirror = debug.MakeMirror(f).script();
-  var json = mirror.toJSONProtocol(true);
-  print(json);
+  var serializer = debug.MakeMirrorSerializer();
+  var json = serializer.serializeValue(mirror);
 
   // Check the mirror hierachy.
   assertTrue(mirror instanceof debug.Mirror);
diff --git a/test/mjsunit/mirror-string.js b/test/mjsunit/mirror-string.js
index 0a382d3cf..eeabc5fe2 100644
--- a/test/mjsunit/mirror-string.js
+++ b/test/mjsunit/mirror-string.js
@@ -33,7 +33,8 @@ const kMaxProtocolStringLength = 80; // Constant from mirror-delay.js
 function testStringMirror(s) {
   // Create mirror and JSON representation.
   var mirror = debug.MakeMirror(s);
-  var json = mirror.toJSONProtocol(true);
+  var serializer = debug.MakeMirrorSerializer();
+  var json = serializer.serializeValue(mirror);
 
   // Check the mirror hierachy.
   assertTrue(mirror instanceof debug.Mirror);
diff --git a/test/mjsunit/mirror-undefined.js b/test/mjsunit/mirror-undefined.js
index fc35c8d03..2b5b84c6a 100644
--- a/test/mjsunit/mirror-undefined.js
+++ b/test/mjsunit/mirror-undefined.js
@@ -30,7 +30,8 @@
 
 // Create mirror and JSON representation.
 var mirror = debug.MakeMirror(void 0);
-var json = mirror.toJSONProtocol(true);
+var serializer = debug.MakeMirrorSerializer();
+var json = serializer.serializeValue(mirror);
 
 // Check the mirror hierachy.
 assertTrue(mirror instanceof debug.Mirror);
diff --git a/test/mjsunit/mirror-unresolved-function.js b/test/mjsunit/mirror-unresolved-function.js
index ab4950894..21d0e561b 100644
--- a/test/mjsunit/mirror-unresolved-function.js
+++ b/test/mjsunit/mirror-unresolved-function.js
@@ -28,8 +28,22 @@
 // Flags: --expose-debug-as debug
 // Test the mirror object for unresolved functions.
 
+function MirrorRefCache(json_refs) {
+  var tmp = eval('(' + json_refs + ')');
+  this.refs_ = [];
+  for (var i = 0; i < tmp.length; i++) {
+    this.refs_[tmp[i].handle] = tmp[i];
+  }
+}
+
+MirrorRefCache.prototype.lookup = function(handle) {
+  return this.refs_[handle];
+}
+
 var mirror = new debug.UnresolvedFunctionMirror("f");
-var json = mirror.toJSONProtocol(true);
+var serializer = debug.MakeMirrorSerializer();
+var json = serializer.serializeValue(mirror);
+var refs = new MirrorRefCache(serializer.serializeReferencedObjects());
 
 // Check the mirror hierachy for unresolved functions.
 assertTrue(mirror instanceof debug.Mirror);
@@ -50,12 +64,15 @@ assertEquals('undefined', mirror.protoObject().type());
 assertEquals('undefined', mirror.prototypeObject().type());
   
 // Parse JSON representation of unresolved functions and check.
-/*var fromJSON = eval('(' + json + ')');
-assertEquals('function', fromJSON.type);
-assertEquals('Function', fromJSON.className);
-assertEquals('undefined', fromJSON.constructorFunction.type);
-assertEquals('undefined', fromJSON.protoObject.type);
-assertEquals('undefined', fromJSON.prototypeObject.type);
+var fromJSON = eval('(' + json + ')');
+assertEquals('function', fromJSON.type, 'Unexpected mirror type in JSON');
+assertEquals('Function', fromJSON.className, 'Unexpected mirror class name in JSON');
+assertEquals(mirror.constructorFunction().handle(), fromJSON.constructorFunction.ref, 'Unexpected constructor function handle in JSON');
+assertEquals('undefined', refs.lookup(fromJSON.constructorFunction.ref).type, 'Unexpected constructor function type in JSON');
+assertEquals(mirror.protoObject().handle(), fromJSON.protoObject.ref, 'Unexpected proto object handle in JSON');
+assertEquals('undefined', refs.lookup(fromJSON.protoObject.ref).type, 'Unexpected proto object type in JSON');
+assertEquals(mirror.prototypeObject().handle(), fromJSON.prototypeObject.ref, 'Unexpected prototype object handle in JSON');
+assertEquals('undefined', refs.lookup(fromJSON.prototypeObject.ref).type, 'Unexpected prototype object type in JSON');
 assertFalse(fromJSON.resolved);
 assertEquals("f", fromJSON.name);
-assertEquals(void 0, fromJSON.source);*/
+assertEquals(void 0, fromJSON.source);
diff --git a/test/mjsunit/regress/regress-1081309.js b/test/mjsunit/regress/regress-1081309.js
index 68710391f..3da338609 100644
--- a/test/mjsunit/regress/regress-1081309.js
+++ b/test/mjsunit/regress/regress-1081309.js
@@ -34,14 +34,32 @@ Debug = debug.Debug
 listenerCalled = false;
 exception = false;
 
-function safeEval(code) {
-  try {
-    return eval('(' + code + ')');
-  } catch (e) {
-    return undefined;
+function ParsedResponse(json) {
+  this.response_ = eval('(' + json + ')');
+  this.refs_ = [];
+  if (this.response_.refs) {
+    for (var i = 0; i < this.response_.refs.length; i++) {
+      this.refs_[this.response_.refs[i].handle] = this.response_.refs[i];
+    }
   }
 }
 
+
+ParsedResponse.prototype.response = function() {
+  return this.response_;
+}
+
+
+ParsedResponse.prototype.body = function() {
+  return this.response_.body;
+}
+
+
+ParsedResponse.prototype.lookup = function(handle) {
+  return this.refs_[handle];
+}
+
+
 function listener(event, exec_state, event_data, data) {
   try {
   if (event == Debug.DebugEvent.Exception)
@@ -56,12 +74,13 @@ function listener(event, exec_state, event_data, data) {
     // Get the backtrace.
     var json;
     json = '{"seq":0,"type":"request","command":"backtrace"}'
-    var backtrace = safeEval(dcp.processDebugJSONRequest(json)).body;
+    var response = new ParsedResponse(dcp.processDebugJSONRequest(json));
+    var backtrace = response.body();
     assertEquals(2, backtrace.totalFrames);
     assertEquals(2, backtrace.frames.length);
 
-    assertEquals("g", backtrace.frames[0].func.name);
-    assertEquals("", backtrace.frames[1].func.name);
+    assertEquals("g", response.lookup(backtrace.frames[0].func.ref).name);
+    assertEquals("", response.lookup(backtrace.frames[1].func.ref).name);
 
     listenerCalled = true;
   }