CSE2410 Fall 2014 Bounce

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

// Redistribution and use in source and binary forms, with or without

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

// met:

//

//     * Redistributions of source code must retain the above copyright

//       notice, this list of conditions and the following disclaimer.

//     * Redistributions in binary form must reproduce the above

//       copyright notice, this list of conditions and the following

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//       with the distribution.

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//       contributors may be used to endorse or promote products derived

//       from this software without specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

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

// 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.

// 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));

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);

}

function assertHoley(obj, name_opt) {

  assertEquals(true, isHoley(obj), name_opt);

}

function assertNotHoley(obj, name_opt) {

  assertEquals(false, isHoley(obj), name_opt);

}

if (support_smi_only_arrays) {

  obj = [];

  assertNotHoley(obj);

  assertKind(elements_kind.fast_smi_only, obj);

  obj = [1, 2, 3];

  assertNotHoley(obj);

  assertKind(elements_kind.fast_smi_only, obj);

  obj = new Array();

  assertNotHoley(obj);

  assertKind(elements_kind.fast_smi_only, obj);

  obj = new Array(0);

  assertNotHoley(obj);

  assertKind(elements_kind.fast_smi_only, obj);

  obj = new Array(2);

  assertHoley(obj);

  assertKind(elements_kind.fast_smi_only, obj);

  obj = new Array(1,2,3);

  assertNotHoley(obj);

  assertKind(elements_kind.fast_smi_only, obj);

  obj = new Array(1, "hi", 2, undefined);

  assertNotHoley(obj);

  assertKind(elements_kind.fast, obj);

  function fastliteralcase(literal, value) {

    literal[0] = value;

    return literal;

  }

  function get_standard_literal() {

    var literal = [1, 2, 3];

    return literal;

  }

  // Case: [1,2,3] as allocation site

  obj = fastliteralcase(get_standard_literal(), 1);

  assertKind(elements_kind.fast_smi_only, obj);

  obj = fastliteralcase(get_standard_literal(), 1.5);

  assertKind(elements_kind.fast_double, obj);

  obj = fastliteralcase(get_standard_literal(), 2);

  assertKind(elements_kind.fast_double, obj);

  // The test below is in a loop because arrays that live

  // at global scope without the chance of being recreated

  // don't have allocation site information attached.

  for (i = 0; i < 2; i++) {

    obj = fastliteralcase([5, 3, 2], 1.5);

    assertKind(elements_kind.fast_double, obj);

    obj = fastliteralcase([3, 6, 2], 1.5);

    assertKind(elements_kind.fast_double, obj);

    obj = fastliteralcase([2, 6, 3], 2);

    assertKind(elements_kind.fast_smi_only, obj);

  }

  // Verify that we will not pretransition the double->fast path.

  obj = fastliteralcase(get_standard_literal(), "elliot");

  assertKind(elements_kind.fast, obj);

  obj = fastliteralcase(get_standard_literal(), 3);

  assertKind(elements_kind.fast, obj);

  // Make sure this works in crankshafted code too.

  %OptimizeFunctionOnNextCall(get_standard_literal);

  get_standard_literal();

  obj = get_standard_literal();

  assertKind(elements_kind.fast, obj);

  function fastliteralcase_smifast(value) {

    var literal = [1, 2, 3, 4];

    literal[0] = value;

    return literal;

  }

  obj = fastliteralcase_smifast(1);

  assertKind(elements_kind.fast_smi_only, obj);

  obj = fastliteralcase_smifast("carter");

  assertKind(elements_kind.fast, obj);

  obj = fastliteralcase_smifast(2);

  assertKind(elements_kind.fast, obj);

  // Case: make sure transitions from packed to holey are tracked

  function fastliteralcase_smiholey(index, value) {

    var literal = [1, 2, 3, 4];

    literal[index] = value;

    return literal;

  }

  obj = fastliteralcase_smiholey(5, 1);

  assertKind(elements_kind.fast_smi_only, obj);

  assertHoley(obj);

  obj = fastliteralcase_smiholey(0, 1);

  assertKind(elements_kind.fast_smi_only, obj);

  assertHoley(obj);

  function newarraycase_smidouble(value) {

    var a = new Array();

    a[0] = value;

    return a;

  }

  // Case: new Array() as allocation site, smi->double

  obj = newarraycase_smidouble(1);

  assertKind(elements_kind.fast_smi_only, obj);

  obj = newarraycase_smidouble(1.5);

  assertKind(elements_kind.fast_double, obj);

  obj = newarraycase_smidouble(2);

  assertKind(elements_kind.fast_double, obj);

  function newarraycase_smiobj(value) {

    var a = new Array();

    a[0] = value;

    return a;

  }

  // Case: new Array() as allocation site, smi->fast

  obj = newarraycase_smiobj(1);

  assertKind(elements_kind.fast_smi_only, obj);

  obj = newarraycase_smiobj("gloria");

  assertKind(elements_kind.fast, obj);

  obj = newarraycase_smiobj(2);

  assertKind(elements_kind.fast, obj);

  function newarraycase_length_smidouble(value) {

    var a = new Array(3);

    a[0] = value;

    return a;

  }

  // Case: new Array(length) as allocation site

  obj = newarraycase_length_smidouble(1);

  assertKind(elements_kind.fast_smi_only, obj);

  obj = newarraycase_length_smidouble(1.5);

  assertKind(elements_kind.fast_double, obj);

  obj = newarraycase_length_smidouble(2);

  assertKind(elements_kind.fast_double, obj);

  // Try to continue the transition to fast object. This won't work for

  // constructed arrays because constructor dispatch is done on the

  // elements kind, and a DOUBLE array constructor won't create an allocation

  // memento.

  obj = newarraycase_length_smidouble("coates");

  assertKind(elements_kind.fast, obj);

  obj = newarraycase_length_smidouble(2);

  assertKind(elements_kind.fast_double, obj);

  function newarraycase_length_smiobj(value) {

    var a = new Array(3);

    a[0] = value;

    return a;

  }

  // Case: new Array(<length>) as allocation site, smi->fast

  obj = newarraycase_length_smiobj(1);

  assertKind(elements_kind.fast_smi_only, obj);

  obj = newarraycase_length_smiobj("gloria");

  assertKind(elements_kind.fast, obj);

  obj = newarraycase_length_smiobj(2);

  assertKind(elements_kind.fast, obj);

  function newarraycase_list_smidouble(value) {

    var a = new Array(1, 2, 3);

    a[0] = value;

    return a;

  }

  obj = newarraycase_list_smidouble(1);

  assertKind(elements_kind.fast_smi_only, obj);

  obj = newarraycase_list_smidouble(1.5);

  assertKind(elements_kind.fast_double, obj);

  obj = newarraycase_list_smidouble(2);

  assertKind(elements_kind.fast_double, obj);

  function newarraycase_list_smiobj(value) {

    var a = new Array(4, 5, 6);

    a[0] = value;

    return a;

  }

  obj = newarraycase_list_smiobj(1);

  assertKind(elements_kind.fast_smi_only, obj);

  obj = newarraycase_list_smiobj("coates");

  assertKind(elements_kind.fast, obj);

  obj = newarraycase_list_smiobj(2);

  assertKind(elements_kind.fast, obj);

  // Case: array constructor calls with out of date feedback.

  // The boilerplate should incorporate all feedback, but the input array

  // should be minimally transitioned based on immediate need.

  (function() {

    function foo(i) {

      // We have two cases, one for literals one for constructed arrays.

      var a = (i == 0)

        ? [1, 2, 3]

        : new Array(1, 2, 3);

      return a;

    }

    for (i = 0; i < 2; i++) {

      a = foo(i);

      b = foo(i);

      b[5] = 1;  // boilerplate goes holey

      assertHoley(foo(i));

      a[0] = 3.5;  // boilerplate goes holey double

      assertKind(elements_kind.fast_double, a);

      assertNotHoley(a);

      c = foo(i);

      assertKind(elements_kind.fast_double, c);

      assertHoley(c);

    }

  })();

  function newarraycase_onearg(len, value) {

    var a = new Array(len);

    a[0] = value;

    return a;

  }

  obj = newarraycase_onearg(5, 3.5);

  assertKind(elements_kind.fast_double, obj);

  obj = newarraycase_onearg(10, 5);

  assertKind(elements_kind.fast_double, obj);

  obj = newarraycase_onearg(0, 5);

  assertKind(elements_kind.fast_double, obj);

  // Now pass a length that forces the dictionary path.

  obj = newarraycase_onearg(100000, 5);

  assertKind(elements_kind.dictionary, obj);

  assertTrue(obj.length == 100000);

  // Verify that cross context calls work

  var realmA = Realm.current();

  var realmB = Realm.create();

  assertEquals(0, realmA);

  assertEquals(1, realmB);

  function instanceof_check(type) {

    assertTrue(new type() instanceof type);

    assertTrue(new type(5) instanceof type);

    assertTrue(new type(1,2,3) instanceof type);

  }

  function instanceof_check2(type) {

    assertTrue(new type() instanceof type);

    assertTrue(new type(5) instanceof type);

    assertTrue(new type(1,2,3) instanceof type);

  }

  var realmBArray = Realm.eval(realmB, "Array");

  instanceof_check(Array);

  instanceof_check(realmBArray);

  // instanceof_check2 is here because the call site goes through a state.

  // Since instanceof_check(Array) was first called with the current context

  // Array function, it went from (uninit->Array) then (Array->megamorphic).

  // We'll get a different state traversal if we start with realmBArray.

  // It'll go (uninit->realmBArray) then (realmBArray->megamorphic). Recognize

  // that state "Array" implies an AllocationSite is present, and code is

  // configured to use it.

  instanceof_check2(realmBArray);

  instanceof_check2(Array);

  %OptimizeFunctionOnNextCall(instanceof_check);

  // No de-opt will occur because HCallNewArray wasn't selected, on account of

  // the call site not being monomorphic to Array.

  instanceof_check(Array);

  assertOptimized(instanceof_check);

  instanceof_check(realmBArray);

  assertOptimized(instanceof_check);

  // Try to optimize again, but first clear all type feedback, and allow it

  // to be monomorphic on first call. Only after crankshafting do we introduce

  // realmBArray. This should deopt the method.

  %DeoptimizeFunction(instanceof_check);

  %ClearFunctionTypeFeedback(instanceof_check);

  instanceof_check(Array);

  instanceof_check(Array);

  %OptimizeFunctionOnNextCall(instanceof_check);

  instanceof_check(Array);

  assertOptimized(instanceof_check);

  instanceof_check(realmBArray);

  assertUnoptimized(instanceof_check);

  // Case: make sure nested arrays benefit from allocation site feedback as

  // well.

  (function() {

    // Make sure we handle nested arrays

   function get_nested_literal() {

     var literal = [[1,2,3,4], [2], [3]];

     return literal;

   }

   obj = get_nested_literal();

   assertKind(elements_kind.fast, obj);

   obj[0][0] = 3.5;

   obj[2][0] = "hello";

   obj = get_nested_literal();

   assertKind(elements_kind.fast_double, obj[0]);

   assertKind(elements_kind.fast_smi_only, obj[1]);

   assertKind(elements_kind.fast, obj[2]);

   // A more complex nested literal case.

   function get_deep_nested_literal() {

     var literal = [[1], [[2], "hello"], 3, [4]];

     return literal;

   }

   obj = get_deep_nested_literal();

   assertKind(elements_kind.fast_smi_only, obj[1][0]);

   obj[0][0] = 3.5;

   obj[1][0][0] = "goodbye";

   assertKind(elements_kind.fast_double, obj[0]);

   assertKind(elements_kind.fast, obj[1][0]);

   obj = get_deep_nested_literal();

   assertKind(elements_kind.fast_double, obj[0]);

   assertKind(elements_kind.fast, obj[1][0]);

  })();

  // Make sure object literals with array fields benefit from the type feedback

  // that allocation mementos provide.

  (function() {

    // A literal in an object

    function get_object_literal() {

      var literal = {

        array: [1,2,3],

        data: 3.5

      };

      return literal;

    }

    obj = get_object_literal();

    assertKind(elements_kind.fast_smi_only, obj.array);

    obj.array[1] = 3.5;

    assertKind(elements_kind.fast_double, obj.array);

    obj = get_object_literal();

    assertKind(elements_kind.fast_double, obj.array);

    function get_nested_object_literal() {

      var literal = {

        array: [[1],[2],[3]],

        data: 3.5

      };

      return literal;

    }

    obj = get_nested_object_literal();

    assertKind(elements_kind.fast, obj.array);

    assertKind(elements_kind.fast_smi_only, obj.array[1]);

    obj.array[1][0] = 3.5;

    assertKind(elements_kind.fast_double, obj.array[1]);

    obj = get_nested_object_literal();

    assertKind(elements_kind.fast_double, obj.array[1]);

    %OptimizeFunctionOnNextCall(get_nested_object_literal);

    get_nested_object_literal();

    obj = get_nested_object_literal();

    assertKind(elements_kind.fast_double, obj.array[1]);

    // Make sure we handle nested arrays

    function get_nested_literal() {

      var literal = [[1,2,3,4], [2], [3]];

      return literal;

    }

    obj = get_nested_literal();

    assertKind(elements_kind.fast, obj);

    obj[0][0] = 3.5;

    obj[2][0] = "hello";

    obj = get_nested_literal();

    assertKind(elements_kind.fast_double, obj[0]);

    assertKind(elements_kind.fast_smi_only, obj[1]);

    assertKind(elements_kind.fast, obj[2]);

    // A more complex nested literal case.

    function get_deep_nested_literal() {

      var literal = [[1], [[2], "hello"], 3, [4]];

      return literal;

    }

    obj = get_deep_nested_literal();

    assertKind(elements_kind.fast_smi_only, obj[1][0]);

    obj[0][0] = 3.5;

    obj[1][0][0] = "goodbye";

    assertKind(elements_kind.fast_double, obj[0]);

    assertKind(elements_kind.fast, obj[1][0]);

    obj = get_deep_nested_literal();

    assertKind(elements_kind.fast_double, obj[0]);

    assertKind(elements_kind.fast, obj[1][0]);

  })();

}