test/mjsunit/unbox-double-arrays.js

// Copyright 2012 the V8 project authors. All rights reserved.
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//
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// Test dictionary -> double elements -> dictionary elements round trip

// Flags: --allow-natives-syntax --unbox-double-arrays --expose-gc

var large_array_size = 100000;
var approx_dict_to_elements_threshold = 70000;

var name = 0;

function expected_array_value(i) {
  if ((i % 50) != 0) {
    return i;
  } else {
    return i + 0.5;
  }
}

function force_to_fast_double_array(a) {
  a[large_array_size - 2] = 1;
  for (var i= 0; i < approx_dict_to_elements_threshold; ++i ) {
    a[i] = expected_array_value(i);
  }
  assertTrue(%HasFastDoubleElements(a));
}

function make_object_like_array(size) {
  obj = new Object();
  obj.length = size;
  return obj;
}

function testOneArrayType(allocator) {
  var large_array = new allocator(large_array_size);
  force_to_fast_double_array(large_array);
  var six = 6;

  for (var i= 0; i < approx_dict_to_elements_threshold; i += 501 ) {
    assertEquals(expected_array_value(i), large_array[i]);
  }

  // This function has a constant and won't get inlined.
  function computed_6() {
    return six;
  }

  // Multiple versions of the test function makes sure that IC/Crankshaft state
  // doesn't get reused.
  function test_various_loads(a, value_5, value_6, value_7) {
    assertTrue(%HasFastDoubleElements(a));
    assertEquals(value_5, a[5]);
    assertEquals(value_6, a[6]);
    assertEquals(value_6, a[computed_6()]); // Test non-constant key
    assertEquals(value_7, a[7]);
    assertEquals(large_array_size, a.length);
    assertTrue(%HasFastDoubleElements(a));
  }

  function test_various_loads2(a, value_5, value_6, value_7) {
    assertTrue(%HasFastDoubleElements(a));
    assertEquals(value_5, a[5]);
    assertEquals(value_6, a[6]);
    assertEquals(value_6, a[computed_6()]); // Test non-constant key
    assertEquals(value_7, a[7]);
    assertEquals(large_array_size, a.length);
    assertTrue(%HasFastDoubleElements(a));
  }

  function test_various_loads3(a, value_5, value_6, value_7) {
    assertTrue(%HasFastDoubleElements(a));
    assertEquals(value_5, a[5]);
    assertEquals(value_6, a[6]);
    assertEquals(value_6, a[computed_6()]); // Test non-constant key
    assertEquals(value_7, a[7]);
    assertEquals(large_array_size, a.length);
    assertTrue(%HasFastDoubleElements(a));
  }

  function test_various_loads4(a, value_5, value_6, value_7) {
    assertTrue(%HasFastDoubleElements(a));
    assertEquals(value_5, a[5]);
    assertEquals(value_6, a[6]);
    assertEquals(value_6, a[computed_6()]); // Test non-constant key
    assertEquals(value_7, a[7]);
    assertEquals(large_array_size, a.length);
    assertTrue(%HasFastDoubleElements(a));
  }

  function test_various_loads5(a, value_5, value_6, value_7) {
    assertTrue(%HasFastDoubleElements(a));
    if (value_5 != undefined) {
      assertEquals(value_5, a[5]);
    };
    if (value_6 != undefined) {
      assertEquals(value_6, a[6]);
      assertEquals(value_6, a[computed_6()]); // Test non-constant key
    }
    assertEquals(value_7, a[7]);
    assertEquals(large_array_size, a.length);
    assertTrue(%HasFastDoubleElements(a));
  }

  function test_various_loads6(a, value_5, value_6, value_7) {
    assertTrue(%HasFastDoubleElements(a));
    assertEquals(value_5, a[5]);
    assertEquals(value_6, a[6]);
    assertEquals(value_6, a[computed_6()]); // Test non-constant key
    assertEquals(value_7, a[7]);
    assertEquals(large_array_size, a.length);
    assertTrue(%HasFastDoubleElements(a));
  }

  function test_various_loads7(a, value_5, value_6, value_7) {
    assertTrue(%HasFastDoubleElements(a));
    assertEquals(value_5, a[5]);
    assertEquals(value_6, a[6]);
    assertEquals(value_6, a[computed_6()]); // Test non-constant key
    assertEquals(value_7, a[7]);
    assertEquals(large_array_size, a.length);
    assertTrue(%HasFastDoubleElements(a));
  }

  function test_various_stores(a, value_5, value_6, value_7) {
    assertTrue(%HasFastDoubleElements(a));
    a[5] = value_5;
    a[computed_6()] = value_6;
    a[7] = value_7;
    assertTrue(%HasFastDoubleElements(a));
  }

  // Test double and integer values
  test_various_loads(large_array,
                     expected_array_value(5),
                     expected_array_value(6),
                     expected_array_value(7));
  test_various_loads(large_array,
                     expected_array_value(5),
                     expected_array_value(6),
                     expected_array_value(7));
  test_various_loads(large_array,
                     expected_array_value(5),
                     expected_array_value(6),
                     expected_array_value(7));
  %OptimizeFunctionOnNextCall(test_various_loads);
  test_various_loads(large_array,
                     expected_array_value(5),
                     expected_array_value(6),
                     expected_array_value(7));

  // Test NaN values
  test_various_stores(large_array, NaN, -NaN, expected_array_value(7));

  test_various_loads2(large_array,
                      NaN,
                      -NaN,
                      expected_array_value(7));
  test_various_loads2(large_array,
                      NaN,
                      -NaN,
                      expected_array_value(7));
  test_various_loads2(large_array,
                      NaN,
                      -NaN,
                      expected_array_value(7));
  %OptimizeFunctionOnNextCall(test_various_loads2);
  test_various_loads2(large_array,
                      NaN,
                      -NaN,
                      expected_array_value(7));

  // Test Infinity values
  test_various_stores(large_array,
                      Infinity,
                      -Infinity,
                      expected_array_value(7));

  test_various_loads3(large_array,
                      Infinity,
                      -Infinity,
                      expected_array_value(7));
  test_various_loads3(large_array,
                      Infinity,
                      -Infinity,
                      expected_array_value(7));
  test_various_loads3(large_array,
                      Infinity,
                      -Infinity,
                      expected_array_value(7));
  %OptimizeFunctionOnNextCall(test_various_loads3);
  test_various_loads3(large_array,
                      Infinity,
                      -Infinity,
                      expected_array_value(7));

  // Test the hole for the default runtime implementation.
  delete large_array[5];
  delete large_array[6];
  test_various_loads4(large_array,
                      undefined,
                      undefined,
                      expected_array_value(7));

  // Test the keyed load IC implementation when the value is the hole.
  test_various_stores(large_array,
                      expected_array_value(5),
                      expected_array_value(6),
                      expected_array_value(7));
  test_various_loads5(large_array,
                      expected_array_value(5),
                      expected_array_value(6),
                      expected_array_value(7));
  test_various_loads5(large_array,
                      expected_array_value(5),
                      expected_array_value(6),
                      expected_array_value(7));
  delete large_array[5];
  delete large_array[6];
  test_various_loads5(large_array,
                      undefined,
                      undefined,
                      expected_array_value(7));
  test_various_loads5(large_array,
                      undefined,
                      undefined,
                      expected_array_value(7));

  // Make sure Crankshaft code handles the hole correctly (bailout)
  var large_array = new allocator(large_array_size);
  force_to_fast_double_array(large_array);
  test_various_stores(large_array,
                      expected_array_value(5),
                      expected_array_value(6),
                      expected_array_value(7));
  test_various_loads6(large_array,
                      expected_array_value(5),
                      expected_array_value(6),
                      expected_array_value(7));
  test_various_loads6(large_array,
                      expected_array_value(5),
                      expected_array_value(6),
                      expected_array_value(7));
  %OptimizeFunctionOnNextCall(test_various_loads6);
  test_various_loads6(large_array,
                      expected_array_value(5),
                      expected_array_value(6),
                      expected_array_value(7));

  delete large_array[5];
  delete large_array[6];
  test_various_loads6(large_array,
                      undefined,
                      undefined,
                      expected_array_value(7));

  %DeoptimizeFunction(test_various_loads6);
  %ClearFunctionFeedback(test_various_stores);
  %ClearFunctionFeedback(test_various_loads7);

  // Test stores for non-NaN.
  var large_array = new allocator(large_array_size);
  force_to_fast_double_array(large_array);
  %OptimizeFunctionOnNextCall(test_various_stores);
  test_various_stores(large_array,
                      expected_array_value(5),
                      expected_array_value(6),
                      expected_array_value(7));

  test_various_stores(large_array,
                      expected_array_value(5),
                      expected_array_value(6),
                      expected_array_value(7));

  test_various_loads7(large_array,
                      expected_array_value(5),
                      expected_array_value(6),
                      expected_array_value(7));

  test_various_loads7(large_array,
                      expected_array_value(5),
                      expected_array_value(6),
                      expected_array_value(7));

  %OptimizeFunctionOnNextCall(test_various_loads7);

  test_various_loads7(large_array,
                      expected_array_value(5),
                      expected_array_value(6),
                      expected_array_value(7));

  // Test NaN behavior for stores.
  test_various_stores(large_array,
                      NaN,
                      -NaN,
                      expected_array_value(7));

  test_various_stores(large_array,
                      NaN,
                      -NaN,
                      expected_array_value(7));

  test_various_loads7(large_array,
                      NaN,
                      -NaN,
                      expected_array_value(7));

  // Test Infinity behavior for stores.
  test_various_stores(large_array,
                      Infinity,
                      -Infinity,
                      expected_array_value(7));

  test_various_stores(large_array,
                      Infinity,
                      -Infinity,
                      expected_array_value(7));

  test_various_loads7(large_array,
                      Infinity,
                      -Infinity,
                      expected_array_value(7));

  // Make sure that we haven't converted from fast double.
  assertTrue(%HasFastDoubleElements(large_array));
}

// Force gc here to start with a clean heap if we repeat this test multiple
// times.
gc();
testOneArrayType(make_object_like_array);
testOneArrayType(Array);

var large_array = new Array(large_array_size);
force_to_fast_double_array(large_array);
assertTrue(%HasFastDoubleElements(large_array));

// Cause the array to grow beyond it's JSArray length. This will double the
// size of the capacity and force the array into "slow" dictionary case.
large_array[5] = Infinity;
large_array[large_array_size+10001] = 50;
assertTrue(%HasDictionaryElements(large_array));
assertEquals(50, large_array[large_array_size+10001]);
assertEquals(large_array_size+10002, large_array.length);
assertEquals(Infinity, large_array[5]);
assertEquals(undefined, large_array[large_array_size-1]);
assertEquals(undefined, large_array[-1]);
assertEquals(large_array_size+10002, large_array.length);

// Test dictionary -> double elements -> fast elements.
var large_array2 = new Array(large_array_size);
force_to_fast_double_array(large_array2);
delete large_array2[5];

// Convert back to fast elements and make sure the contents of the array are
// unchanged.
large_array2[25] = new Object();
assertTrue(%HasFastObjectElements(large_array2));
for (var i= 0; i < approx_dict_to_elements_threshold; i += 500 ) {
  if (i != 25 && i != 5) {
    assertEquals(expected_array_value(i), large_array2[i]);
  }
}
assertEquals(undefined, large_array2[5]);
assertEquals(undefined, large_array2[large_array_size-1]);
assertEquals(undefined, large_array2[-1]);
assertEquals(large_array_size, large_array2.length);

// Make sure it's possible to change the array's length and that array is still
// intact after the resize.
var large_array3 = new Array(large_array_size);
force_to_fast_double_array(large_array3);
large_array3.length = 60000;
assertEquals(60000, large_array3.length);
assertEquals(undefined, large_array3[60000]);
assertTrue(%HasFastDoubleElements(large_array3));
assertEquals(expected_array_value(5), large_array3[5]);
assertEquals(expected_array_value(6), large_array3[6]);
assertEquals(expected_array_value(7), large_array3[7]);
assertEquals(expected_array_value(large_array3.length-1),
             large_array3[large_array3.length-1]);
assertEquals(undefined, large_array3[large_array_size-1]);
assertEquals(undefined, large_array3[-1]);
gc();

for (var i= 0; i < large_array3.length; i += 501 ) {
  assertEquals(expected_array_value(i), large_array3[i]);
}

large_array3.length = 25;
assertEquals(25, large_array3.length);
assertTrue(%HasFastDoubleElements(large_array3));
assertEquals(undefined, large_array3[25]);
assertEquals(expected_array_value(5), large_array3[5]);
assertEquals(expected_array_value(6), large_array3[6]);
assertEquals(expected_array_value(7), large_array3[7]);
assertEquals(expected_array_value(large_array3.length-1),
             large_array3[large_array3.length-1]);
assertEquals(undefined, large_array3[large_array_size-1]);
assertEquals(undefined, large_array3[-1]);
gc();

for (var i= 0; i < large_array3.length; ++i) {
  assertEquals(expected_array_value(i), large_array3[i]);
}

large_array3.length = 100;
assertEquals(100, large_array3.length);
large_array3[95] = 95;
assertTrue(%HasFastDoubleElements(large_array3));
assertEquals(undefined, large_array3[100]);
assertEquals(95, large_array3[95]);
assertEquals(expected_array_value(5), large_array3[5]);
assertEquals(expected_array_value(6), large_array3[6]);
assertEquals(expected_array_value(7), large_array3[7]);
assertEquals(undefined, large_array3[large_array3.length-1]);
assertEquals(undefined, large_array3[large_array_size-1]);
assertEquals(undefined, large_array3[-1]);
gc();

// Test apply on arrays backed by double elements.
function called_by_apply(arg0, arg1, arg2, arg3, arg4, arg5, arg6) {
  assertEquals(expected_array_value(0), arg0);
  assertEquals(NaN, arg1);
  assertEquals(-NaN, arg2);
  assertEquals(Infinity, arg3);
  assertEquals(-Infinity, arg4);
  assertEquals(expected_array_value(5), arg5);
}

large_array3[1] = NaN;
large_array3[2] = -NaN;
large_array3[3] = Infinity;
large_array3[4] = -Infinity;

function call_apply() {
  called_by_apply.apply({}, large_array3);
}

call_apply();
call_apply();
call_apply();
%OptimizeFunctionOnNextCall(call_apply);
call_apply();
call_apply();
call_apply();

function test_for_in() {
  // Due to previous tests, keys 0..25 and 95 should be present.
  next_expected = 0;
  for (x in large_array3) {
    assertTrue(next_expected++ == x);
    if (next_expected == 25) {
      next_expected = 95;
    }
  }
  assertTrue(next_expected == 96);
}

test_for_in();
test_for_in();
test_for_in();
%OptimizeFunctionOnNextCall(test_for_in);
test_for_in();
test_for_in();
test_for_in();

// Test elements getters.
assertEquals(expected_array_value(10), large_array3[10]);
assertEquals(expected_array_value(-NaN), large_array3[2]);
large_array3.__defineGetter__("2", function(){
    return expected_array_value(10);
});

function test_getter() {
  assertEquals(expected_array_value(10), large_array3[10]);
  assertEquals(expected_array_value(10), large_array3[2]);
}

test_getter();
test_getter();
test_getter();
%OptimizeFunctionOnNextCall(test_getter);
test_getter();
test_getter();
test_getter();

// Test element setters.
large_array4 = new Array(large_array_size);
force_to_fast_double_array(large_array4);

var setter_called = false;

assertEquals(expected_array_value(10), large_array4[10]);
assertEquals(expected_array_value(2), large_array4[2]);
large_array4.__defineSetter__("10", function(value){
    setter_called = true;
  });

function test_setter() {
  setter_called = false;
  large_array4[10] = 119;
  assertTrue(setter_called);
  assertEquals(undefined, large_array4[10]);
  assertEquals(expected_array_value(2), large_array4[2]);
}

test_setter();
test_setter();
test_setter();
%OptimizeFunctionOnNextCall(test_setter);
test_setter();
test_setter();
test_setter();