v8/test/mjsunit/packed-elements.js

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

function test1() {
  var a = Array(8);
  assertTrue(%HasSmiOrObjectElements(a));
  assertTrue(%HasHoleyElements(a));
}

function test2() {
  var a = Array();
  assertTrue(%HasSmiOrObjectElements(a));
  assertFalse(%HasHoleyElements(a));
}

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

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

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

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

function test_with_optimization(f) {
  %PrepareFunctionForOptimization(f);
  for (i = 0; i < 3; ++i) f();
  // Cause the inlined Array() constructor to fall back to the runtime impl.
  %SimulateNewspaceFull();
  f();
  %OptimizeFunctionOnNextCall(f);
  f();
  %SimulateNewspaceFull();  // Make sure GC happens.
  f();
}

test_with_optimization(test1);
test_with_optimization(test2);
test_with_optimization(test3);
test_with_optimization(test4);
test_with_optimization(test5);
test_with_optimization(test6);