CSE2410 Fall 2014 Bounce

// Copyright 2012 the V8 project authors. All rights reserved.

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

// met:

//

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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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

// Flags: --notrack_allocation_sites

// Limit the number of stress runs to reduce polymorphism it defeats some of the

// assumptions made about how elements transitions work because transition stubs

// end up going generic.

// Flags: --stress-runs=2

// 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.

// Reset the GC stress mode to be off. Needed because AllocationMementos only

// live for one gc, so a gc that happens in certain fragile areas of the test

// can break assumptions.

%SetFlags("--gc-interval=-1")

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

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;

  // Every external kind is also an external array.

  assertTrue(%HasExternalArrayElements(obj));

  if (%HasExternalByteElements(obj)) {

    return elements_kind.external_byte;

  }

  if (%HasExternalUnsignedByteElements(obj)) {

    return elements_kind.external_unsigned_byte;

  }

  if (%HasExternalShortElements(obj)) {

    return elements_kind.external_short;

  }

  if (%HasExternalUnsignedShortElements(obj)) {

    return elements_kind.external_unsigned_short;

  }

  if (%HasExternalIntElements(obj)) {

    return elements_kind.external_int;

  }

  if (%HasExternalUnsignedIntElements(obj)) {

    return elements_kind.external_unsigned_int;

  }

  if (%HasExternalFloatElements(obj)) {

    return elements_kind.external_float;

  }

  if (%HasExternalDoubleElements(obj)) {

    return elements_kind.external_double;

  }

  if (%HasExternalPixelElements(obj)) {

    return elements_kind.external_pixel;

  }

}

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);

}

// long-running loop forces OSR.

%NeverOptimizeFunction(construct_smis);

%NeverOptimizeFunction(construct_doubles);

%NeverOptimizeFunction(convert_mixed);

for (var i = 0; i < 1000000; i++) { }

if (support_smi_only_arrays) {

  function construct_smis() {

    var a = [0, 0, 0];

    a[0] = 0;  // Send the COW array map to the steak house.

    assertKind(elements_kind.fast_smi_only, a);

    return a;

  }

  function construct_doubles() {

    var a = construct_smis();

    a[0] = 1.5;

    assertKind(elements_kind.fast_double, a);

    return a;

  }

  // Test transition chain SMI->DOUBLE->FAST (crankshafted function will

  // transition to FAST directly).

  function convert_mixed(array, value, kind) {

    array[1] = value;

    assertKind(kind, array);

    assertEquals(value, array[1]);

  }

  smis = construct_smis();

  convert_mixed(smis, 1.5, elements_kind.fast_double);

  doubles = construct_doubles();

  convert_mixed(doubles, "three", elements_kind.fast);

  convert_mixed(construct_smis(), "three", elements_kind.fast);

  convert_mixed(construct_doubles(), "three", elements_kind.fast);

  smis = construct_smis();

  doubles = construct_doubles();

  convert_mixed(smis, 1, elements_kind.fast);

  convert_mixed(doubles, 1, elements_kind.fast);

  assertTrue(%HaveSameMap(smis, doubles));

}

// Throw away type information in the ICs for next stress run.

gc();