v8/test/mjsunit/packed-elements.js

// Copyright 2012 the V8 project authors. All rights reserved.
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// Flags: --allow-natives-syntax --smi-only-arrays --packed-arrays

var has_packed_elements = !%HasFastHoleyElements(Array());

function test1() {
  var a = Array(8);
  assertTrue(%HasFastSmiOrObjectElements(a));
  assertTrue(%HasFastHoleyElements(a));
}

function test2() {
  var a = Array();
  assertTrue(%HasFastSmiOrObjectElements(a));
  assertFalse(%HasFastHoleyElements(a));
}

function test3() {
  var a = Array(1,2,3,4,5,6,7);
  assertTrue(%HasFastSmiOrObjectElements(a));
  assertFalse(%HasFastHoleyElements(a));
}

function test4() {
  var a = [1, 2, 3, 4];
  assertTrue(%HasFastSmiElements(a));
  assertFalse(%HasFastHoleyElements(a));
  var b = [1, 2,, 4];
  assertTrue(%HasFastSmiElements(b));
  assertTrue(%HasFastHoleyElements(b));
}

function test5() {
  var a = [1, 2, 3, 4.5];
  assertTrue(%HasFastDoubleElements(a));
  assertFalse(%HasFastHoleyElements(a));
  var b = [1,, 3.5, 4];
  assertTrue(%HasFastDoubleElements(b));
  assertTrue(%HasFastHoleyElements(b));
  var c = [1, 3.5,, 4];
  assertTrue(%HasFastDoubleElements(c));
  assertTrue(%HasFastHoleyElements(c));
}

function test6() {
  var x = new Object();
  var a = [1, 2, 3.5, x];
  assertTrue(%HasFastObjectElements(a));
  assertFalse(%HasFastHoleyElements(a));
  assertEquals(1, a[0]);
  assertEquals(2, a[1]);
  assertEquals(3.5, a[2]);
  assertEquals(x, a[3]);
  var b = [1,, 3.5, x];
  assertTrue(%HasFastObjectElements(b));
  assertTrue(%HasFastHoleyElements(b));
  assertEquals(1, b[0]);
  assertEquals(undefined, b[1]);
  assertEquals(3.5, b[2]);
  assertEquals(x, b[3]);
  var c = [1, 3.5, x,,];
  assertTrue(%HasFastObjectElements(c));
  assertTrue(%HasFastHoleyElements(c));
  assertEquals(1, c[0]);
  assertEquals(3.5, c[1]);
  assertEquals(x, c[2]);
  assertEquals(undefined, c[3]);
}

function test_with_optimization(f) {
  // Run tests in a loop to make sure that inlined Array() constructor runs out
  // of new space memory and must fall back on runtime impl.
  for (i = 0; i < 250000; ++i) f();
  %OptimizeFunctionOnNextCall(f);
  for (i = 0; i < 250000; ++i) f(); // Make sure GC happens
}

if (has_packed_elements) {
  test_with_optimization(test1);
  test_with_optimization(test2);
  test_with_optimization(test3);
  test_with_optimization(test4);
  test_with_optimization(test5);
  test_with_optimization(test6);
}