Handle symbols in FrameMirror#invocationText().

src/debug/mirrors.js

 // 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
 
@@ skipping 1481 matching lines @@
 PropertyMirror.prototype.canDelete = function() {
   return (this.attributes() & PropertyAttribute.DontDelete) == 0;
 };
 
 
 PropertyMirror.prototype.name = function() {
   return this.name_;
 };
 
 
+PropertyMirror.prototype.toText = function() {
+  if (IS_SYMBOL(this.name_)) return %Call(SymbolToString, this.name_);
+  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;
 };
 
 
@@ skipping 515 matching lines @@
         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();
+        result += property.toText();
       } else {
         result += '[';
-        result += property.name();
+        result += property.toText();
         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.
@@ skipping 994 matching lines @@
 // Functions needed by the debugger runtime.
 utils.InstallFunctions(utils, DONT_ENUM, [
   "ClearMirrorCache", ClearMirrorCache
 ]);
 
 // Export to debug.js
 utils.Export(function(to) {
   to.MirrorType = MirrorType;
 });
 })