Handle exception when retrieving toJSON function in JSON.stringify.

test/mjsunit/json2.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 87 matching lines @@
 // Test toJSON produced by a getter.
 var tojson_via_getter = { get toJSON() {
                                 return function(x) {
                                          counter++;
                                          return 321;
                                        };
                               },
                           a: 1 };
 TestStringify('321', tojson_via_getter);
 
+assertThrows(function() {
+  JSON.stringify({ get toJSON() { throw "error"; } });
+});
+
 // Test toJSON with key.
 tojson_obj = { toJSON: function(key) { return key + key; } };
 var tojson_with_key_1 = { a: tojson_obj, b: tojson_obj };
 TestStringify('{"a":"aa","b":"bb"}', tojson_with_key_1);
 var tojson_with_key_2 = [ tojson_obj, tojson_obj ];
 TestStringify('["00","11"]', tojson_with_key_2);
 
 // Test toJSON with exception.
 var tojson_ex = { toJSON: function(key) { throw "123" } };
 assertThrows(function() { JSON.stringify(tojson_ex); });
@@ skipping 54 matching lines @@
 non_enum.a = 1;
 Object.defineProperty(non_enum, "b", { value: 2, enumerable: false });
 non_enum.c = 3;
 TestStringify('{"a":1,"c":3}', non_enum);
 
 var str = "external";
 try {
   externalizeString(str, true);
 } catch (e) { }
 TestStringify("\"external\"", str, null, 0);