Fire 'stack' getter of error objects after GC.

src/messages.js

 // Copyright 2012 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 1067 matching lines @@
 
 function captureStackTrace(obj, cons_opt) {
   var stackTraceLimit = $Error.stackTraceLimit;
   if (!stackTraceLimit || !IS_NUMBER(stackTraceLimit)) return;
   if (stackTraceLimit < 0 || stackTraceLimit > 10000) {
     stackTraceLimit = 10000;
   }
   var raw_stack = %CollectStackTrace(obj,
                                      cons_opt ? cons_opt : captureStackTrace,
                                      stackTraceLimit);
+
+  // Don't be lazy if the error stack formatting is custom (observable).
+  if (IS_FUNCTION($Error.prepareStackTrace)) {
+    obj.stack = FormatRawStackTrace(obj, raw_stack);
+    return;
+  }
+
   // Note that 'obj' and 'this' maybe different when called on objects that
   // have the error object on its prototype chain.  The getter replaces itself
   // with a data property as soon as the stack trace has been formatted.
   var getter = function() {
     var value = FormatRawStackTrace(obj, raw_stack);
     %DefineOrRedefineDataProperty(obj, 'stack', value, NONE);
     return value;
   };
   // The 'stack' property of the receiver is set as data property.  If
   // the receiver is the same as holder, this accessor pair is replaced.
   var setter = function(v) {
     %DefineOrRedefineDataProperty(this, 'stack', v, NONE);
   };
 
+  %SetNativeFlag(getter);
   %DefineOrRedefineAccessorProperty(obj, 'stack', getter, setter, DONT_ENUM);
 }
 
 
 function SetUpError() {
   // Define special error type constructors.
 
   var DefineError = function(f) {
     // Store the error function in both the global object
     // and the runtime object. The function is fetched
@@ skipping 139 matching lines @@
     %DefineOrRedefineDataProperty(holder, 'stack', result, NONE);
     return result;
   }
 
   // The 'stack' property of the receiver is set as data property.  If
   // the receiver is the same as holder, this accessor pair is replaced.
   function setter(v) {
     %DefineOrRedefineDataProperty(this, 'stack', v, NONE);
   }
 
+  %SetNativeFlag(getter);
+
   %DefineOrRedefineAccessorProperty(
       boilerplate, 'stack', getter, setter, DONT_ENUM);
 
   return boilerplate;
 }
 
 var kStackOverflowBoilerplate = SetUpStackOverflowBoilerplate();