v8/test/mjsunit/polymorph-arrays.js

// Copyright 2011 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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//       copyright notice, this list of conditions and the following
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//       with the distribution.
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//
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// Flags: --allow-natives-syntax
function init_array(a) {
  for (var i = 0; i < 10; ++i ){
    a[i] = i;
  }
}

function init_sparse_array(a) {
  for (var i = 0; i < 10; ++i ){
    a[i] = i;
  }
  a[200000] = 256;
  return %NormalizeElements(a);
}

function testPolymorphicLoads() {
  function make_polymorphic_load_function() {
    function load(a, i) {
      return a[i];
    }

    var object_array = new Object;
    var sparse_object_array = new Object;
    var js_array = new Array(10);
    var sparse_js_array = %NormalizeElements([]);

    init_array(object_array);
    init_array(js_array);
    init_sparse_array(sparse_object_array);
    init_sparse_array(sparse_js_array);

    assertEquals(1, load(object_array, 1));
    assertEquals(1, load(js_array, 1));
    assertEquals(1, load(sparse_object_array, 1));
    assertEquals(1, load(sparse_js_array, 1));

    return load;
  }

  var object_array = new Object;
  var sparse_object_array = new Object;
  var js_array = new Array(10);
  var sparse_js_array = %NormalizeElements([]);

  init_array(object_array);
  init_array(js_array);
  init_sparse_array(sparse_object_array);
  init_sparse_array(sparse_js_array);

  load = make_polymorphic_load_function();
  assertEquals(undefined, load(js_array, new Object()));
  load = make_polymorphic_load_function();
  assertEquals(undefined, load(object_array, new Object()));
  load = make_polymorphic_load_function();
  assertEquals(undefined, load(sparse_js_array, new Object()));
  load = make_polymorphic_load_function();
  assertEquals(undefined, load(sparse_object_array, new Object()));

  // Try with optimizing compiler.
  load = make_polymorphic_load_function();
  %OptimizeFunctionOnNextCall(load);
  assertEquals(1, load(object_array, 1));
  assertEquals(1, load(js_array, 1));
  assertEquals(1, load(sparse_object_array, 1));
  assertEquals(1, load(sparse_js_array, 1));

  load = make_polymorphic_load_function();
  %OptimizeFunctionOnNextCall(load);
  assertEquals(undefined, load(js_array, new Object()));
  load = make_polymorphic_load_function();
  %OptimizeFunctionOnNextCall(load);
  assertEquals(undefined, load(object_array, new Object()));
  load = make_polymorphic_load_function();
  %OptimizeFunctionOnNextCall(load);
  assertEquals(undefined, load(sparse_js_array, new Object()));
  load = make_polymorphic_load_function();
  %OptimizeFunctionOnNextCall(load);
  assertEquals(undefined, load(sparse_object_array, new Object()));
}

function testPolymorphicStores() {
  function make_polymorphic_store_function() {
    function store(a, i, val) {
      a[i] = val;
    }

    var object_array = new Object;
    var sparse_object_array = new Object;
    var js_array = new Array(10);
    var sparse_js_array = [];
    sparse_js_array.length = 200001;

    init_array(object_array);
    init_array(js_array);
    init_sparse_array(sparse_object_array);
    init_sparse_array(sparse_js_array);

    store(object_array, 1, 256);
    store(js_array, 1, 256);
    store(sparse_object_array, 1, 256);
    store(sparse_js_array, 1, 256);

    return store;
  }

  var object_array = new Object;
  var sparse_object_array = new Object;
  var js_array = new Array(10);
  var sparse_js_array = %NormalizeElements([]);
  sparse_js_array.length = 200001;
  assertTrue(%HasDictionaryElements(sparse_js_array));

  init_array(object_array);
  init_array(js_array);
  init_sparse_array(sparse_object_array);
  init_sparse_array(sparse_js_array);

  store = make_polymorphic_store_function();
  store(object_array, 2, 257);
  store = make_polymorphic_store_function();
  store(js_array, 2, 257);
  store = make_polymorphic_store_function();
  store(sparse_object_array, 2, 257);
  store = make_polymorphic_store_function();
  store(sparse_js_array, 2, 257);

  assertEquals(257, object_array[2]);
  assertEquals(257, js_array[2]);
  assertEquals(257, sparse_js_array[2]);
  assertEquals(257, sparse_object_array[2]);

  // Now try Crankshaft optimized polymorphic stores
  store = make_polymorphic_store_function();
  %OptimizeFunctionOnNextCall(store);
  store(object_array, 3, 258);
  store = make_polymorphic_store_function();
  %OptimizeFunctionOnNextCall(store);
  store(js_array, 3, 258);
  store = make_polymorphic_store_function();
  %OptimizeFunctionOnNextCall(store);
  store(sparse_object_array, 3, 258);
  store = make_polymorphic_store_function();
  %OptimizeFunctionOnNextCall(store);
  store(sparse_js_array, 3, 258);

  assertEquals(258, object_array[3]);
  assertEquals(258, js_array[3]);
  assertEquals(258, sparse_js_array[3]);
  assertEquals(258, sparse_object_array[3]);
}

testPolymorphicLoads();
testPolymorphicStores();