Added handles to the mirror objects. When a mirror for an object is created...

test/mjsunit/regress/regress-1081309.js

 // 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
@@ skipping 16 matching lines @@
 
 // Flags: --expose-debug-as debug
 // Get the Debug object exposed from the debug context global object.
 Debug = debug.Debug
 
 // Make sure that the backtrace command can be processed when the receiver is
 // undefined.
 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)
   {
     // The expected backtrace is
     // 1: g
     // 0: [anonymous]
     
     // 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;
+    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;
   }
   } catch (e) {
     exception = e
   };
 };
 
 // Add the debug event listener.
 Debug.addListener(listener);
 
 // Call method on undefined.
 function g() {
   (void 0).f();
 };
 
 // Break on the exception to do a backtrace with undefined as receiver.
 Debug.setBreakOnException(true);
 try {
   g();
 } catch(e) {
   // Ignore the exception "Cannot call method 'x' of undefined"
 }
 
 // Make sure that the debug event listener vas invoked.
 assertTrue(listenerCalled, "listener not called");
 assertFalse(exception, "exception in listener", exception)