v8/test/mjsunit/regress/regress-json-stringify-gc.js

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var a = [];
var new_space_string = "a";
for (var i = 0; i < 8; i++) {
  new_space_string += new_space_string;
}
for (var i = 0; i < 10000; i++) a.push(new_space_string);

// At some point during the first stringify, allocation causes a GC and
// new_space_string is moved to old space. Make sure that this does not
// screw up reading from the correct location.
json1 = JSON.stringify(a);
json2 = JSON.stringify(a);
assertTrue(json1 == json2, "GC caused JSON.stringify to fail.");

// Check that the slow path of JSON.stringify works correctly wrt GC.
for (var i = 0; i < 10000; i++) {
  var s = i.toString();
  assertEquals('"' + s + '"', JSON.stringify(s, null, 0));
}

for (var i = 0; i < 10000; i++) {
  var s = i.toString() + "\u2603";
  assertEquals('"' + s + '"', JSON.stringify(s, null, 0));
}