CSE2410 Fall 2014 Bounce

// Copyright 2013 the V8 project authors. All rights reserved.

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// modification, are permitted provided that the following conditions are

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//

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// Flags: --allow-natives-syntax --smi-only-arrays --expose-gc

// Flags: --track-allocation-sites --noalways-opt

// Test element kind of objects.

// Since --smi-only-arrays affects builtins, its default setting at compile

// time sticks if built with snapshot.  If --smi-only-arrays is deactivated

// by default, only a no-snapshot build actually has smi-only arrays enabled

// in this test case.  Depending on whether smi-only arrays are actually

// enabled, this test takes the appropriate code path to check smi-only arrays.

// support_smi_only_arrays = %HasFastSmiElements(new Array(1,2,3,4,5,6,7,8));

support_smi_only_arrays = true;

if (support_smi_only_arrays) {

  print("Tests include smi-only arrays.");

} else {

  print("Tests do NOT include smi-only arrays.");

}

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);

}

if (support_smi_only_arrays) {

  function get_literal(x) {

    var literal = [1, 2, x];

    return literal;

  }

  get_literal(3);

  get_literal(3);

  %OptimizeFunctionOnNextCall(get_literal);

  a = get_literal(3);

  assertOptimized(get_literal);

  assertTrue(%HasFastSmiElements(a));

  a[0] = 3.5;

  // We should have transitioned the boilerplate array to double, and

  // crankshafted code should de-opt on the unexpected elements kind

  b = get_literal(3);

  assertTrue(%HasFastDoubleElements(b));

  assertEquals([1, 2, 3], b);

  assertUnoptimized(get_literal);

  // Optimize again

  get_literal(3);

  %OptimizeFunctionOnNextCall(get_literal);

  b = get_literal(3);

  assertTrue(%HasFastDoubleElements(b));

  assertOptimized(get_literal);

  // 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);

  })();

}