test/mjsunit/big-object-literal.js

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// Test that we can make large object literals that work.
// Also test that we can attempt to make even larger object literals without
// crashing.
function testLiteral(size, array_in_middle) {
  print(size);

  var f;

  // Build object-literal string.
  var literal = "function f() { return ";

  for (var i = 0; i < size; i++) {
    literal += "{a:";
  }

  literal += array_in_middle ? " [42.2]" : "{a:42.2}";

  for (var i = 0; i < size; i++) {
    literal += "}";
    if (i < size - 1) {
      literal += ", b:42, c:/asd/, x:'foo', y:[], z:new Object()";
    }
  }

  literal += "; }";

  // Create the object literal.
  eval(literal);

  var x = f();

  // Check that the properties have the expected values.
  for (var i = 0; i < size; i++) {
    x = x.a;
  }

  if (array_in_middle) {
    assertEquals(42.2, x[0]), "x array in middle";
    x[0] = 41.2;
  } else {
    assertEquals(42.2, x.a, "x object in middle");
    x.a = 41.2;
  }

  var y = f();
  for (var i = 0; i < size; i++) {
    y = y.a;
  }

  if (array_in_middle) {
    assertEquals(42.2, y[0], "y array in middle");
    y[0] = 41.2;
  } else {
    assertEquals(42.2, y.a, "y object in middle");
    y.a = 41.2;
  }
}

// The sizes to test.
var sizes = [1, 2, 100, 200];

// Run the test.
for (var i = 0; i < sizes.length; i++) {
  testLiteral(sizes[i], false);
  testLiteral(sizes[i], true);
}


function checkExpectedException(e) {
  assertInstanceof(e, RangeError);
  assertTrue(e.message.indexOf("Maximum call stack size exceeded") >= 0);
}


function testLiteralAndCatch(size) {
  var big_enough = false;
  try {
    testLiteral(size, false);
  } catch (e) {
    checkExpectedException(e);
    big_enough = true;
  }
  try {
    testLiteral(size, true);
  } catch (e) {
    checkExpectedException(e);
    big_enough = true;
  }
  return big_enough;
}

// Catch stack overflows.

testLiteralAndCatch(1000) ||
testLiteralAndCatch(20000) ||
testLiteralAndCatch(200000);