CSE2410 Fall 2014 Bounce

var elements_kind = {

  fast_smi_only            :  'fast smi only elements',

  fast                     :  'fast elements',

  fast_double              :  'fast double elements',

  dictionary               :  'dictionary elements',

  external_byte            :  'external byte elements',

  external_unsigned_byte   :  'external unsigned byte elements',

  external_short           :  'external short elements',

  external_unsigned_short  :  'external unsigned short elements',

  external_int             :  'external int elements',

  external_unsigned_int    :  'external unsigned int elements',

  external_float           :  'external float elements',

  external_double          :  'external double elements',

  external_pixel           :  'external pixel elements'

}

function getKind(obj) {

  if (%HasFastSmiElements(obj)) return elements_kind.fast_smi_only;

  if (%HasFastObjectElements(obj)) return elements_kind.fast;

  if (%HasFastDoubleElements(obj)) return elements_kind.fast_double;

  if (%HasDictionaryElements(obj)) return elements_kind.dictionary;

}

function isHoley(obj) {

  if (%HasFastHoleyElements(obj)) return true;

  return false;

}

function assertKind(expected, obj, name_opt) {

  if (!support_smi_only_arrays &&

      expected == elements_kind.fast_smi_only) {

    expected = elements_kind.fast;

  }

  assertEquals(expected, getKind(obj), name_opt);

}

  // Test: make sure allocation site information is updated through a

  // transition from SMI->DOUBLE->FAST

  (function() {

    function bar(a, b, c) {

      return [a, b, c];

    }

    a = bar(1, 2, 3);

    a[0] = 3.5;

    a[1] = 'hi';

    b = bar(1, 2, 3);

    assertKind(elements_kind.fast, b);

  })();