text: // 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
  //       disclaimer in the documentation and/or other materials provided
  //       with the distribution.
  //     * Neither the name of Google Inc. nor the names of its
  //       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,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (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.
  
  // support_smi_only_arrays = %HasFastSmiElements(new Array(1,2,3,4,5,6,7,8));
  support_smi_only_arrays = true;
  optimize_constructed_arrays = true;
  
  if (support_smi_only_arrays) {
    print("Tests include smi-only arrays.");
  } else {
    print("Tests do NOT include smi-only arrays.");
  }
  
  if (optimize_constructed_arrays) {
    print("Tests include constructed array optimizations.");
  } else {
    print("Tests do NOT include constructed array optimizations.");
  }
  
  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);
    // TODO(hpayer): bring the following assert back as soon as allocation
    // sites work again for fast literals
    //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);
    // This fails until we turn off optimistic transitions to the
    // most general elements kind seen on keyed stores. It's a goal
    // to turn it off, but for now we need it.
    // obj = fastliteralcase(3);
    // assertKind(elements_kind.fast_double, obj);
  
    // Make sure this works in crankshafted code too.
    %OptimizeFunctionOnNextCall(get_standard_literal);
    get_standard_literal();
    obj = get_standard_literal();
    assertKind(elements_kind.fast_double, 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);
    // TODO(hpayer): bring the following assert back as soon as allocation
    // sites work again for fast literals
    //assertKind(elements_kind.fast, obj);
  
    if (optimize_constructed_arrays) {
      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, but
      // we will not pretransition from double->fast, because
      // it may hurt performance ("poisoning").
      obj = newarraycase_length_smidouble("coates");
      assertKind(elements_kind.fast, obj);
      obj = newarraycase_length_smidouble(2.5);
      // However, because of optimistic transitions, we will
      // transition to the most general kind of elements kind found,
      // therefore I can't count on this assert yet.
      // 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);
  
      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);
      }
  
      var realmBArray = Realm.eval(realmB, "Array");
      instanceof_check(Array);
      instanceof_check(realmBArray);
      %OptimizeFunctionOnNextCall(instanceof_check);
      instanceof_check(Array);
      instanceof_check(realmBArray);
      assertTrue(2 != %GetOptimizationStatus(instanceof_check));
    }
  }
  