v8/test/mjsunit/array-natives-elements.js

// Copyright 2012 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
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//
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// Flags: --allow-natives-syntax --smi-only-arrays
// Flags: --notrack-allocation-sites

// 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([1,2,3,4,5,6,7,8,9,10]);

if (support_smi_only_arrays) {
  print("Tests include smi-only arrays.");
} else {
  print("Tests do NOT include smi-only arrays.");
}

// IC and Crankshaft support for smi-only elements in dynamic array literals.
function get(foo) { return foo; }  // Used to generate dynamic values.

function array_natives_test() {

  // Ensure small array literals start in specific element kind mode.
  assertTrue(%HasFastSmiElements([]));
  assertTrue(%HasFastSmiElements([1]));
  assertTrue(%HasFastSmiElements([1,2]));
  assertTrue(%HasFastDoubleElements([1.1]));
  assertTrue(%HasFastDoubleElements([1.1,2]));

  // Push
  var a0 = [1, 2, 3];
  if (%HasFastSmiElements(a0)) {
    assertTrue(%HasFastSmiElements(a0));
    a0.push(4);
    assertTrue(%HasFastSmiElements(a0));
    a0.push(1.3);
    assertTrue(%HasFastDoubleElements(a0));
    a0.push(1.5);
    assertTrue(%HasFastDoubleElements(a0));
    a0.push({});
    assertTrue(%HasFastObjectElements(a0));
    a0.push({});
    assertTrue(%HasFastObjectElements(a0));
  } else {
    assertTrue(%HasFastObjectElements(a0));
    a0.push(4);
    a0.push(1.3);
    a0.push(1.5);
    a0.push({});
    a0.push({});
    assertTrue(%HasFastObjectElements(a0));
  }
  assertEquals([1,2,3,4,1.3,1.5,{},{}], a0);

  // Concat
  var a1;
  a1 = [1,2,3].concat([]);
  assertTrue(%HasFastSmiElements(a1));
  assertEquals([1,2,3], a1);
  a1 = [1,2,3].concat([4,5,6]);
  assertTrue(%HasFastSmiElements(a1));
  assertEquals([1,2,3,4,5,6], a1);
  a1 = [1,2,3].concat([4,5,6], [7,8,9]);
  assertTrue(%HasFastSmiElements(a1));
  assertEquals([1,2,3,4,5,6,7,8,9], a1);
  a1 = [1.1,2,3].concat([]);
  assertTrue(%HasFastDoubleElements(a1));
  assertEquals([1.1,2,3], a1);
  a1 = [1,2,3].concat([1.1, 2]);
  assertTrue(%HasFastDoubleElements(a1));
  assertEquals([1,2,3,1.1,2], a1);
  a1 = [1.1,2,3].concat([1, 2]);
  assertTrue(%HasFastDoubleElements(a1));
  assertEquals([1.1,2,3,1,2], a1);
  a1 = [1.1,2,3].concat([1.2, 2]);
  assertTrue(%HasFastDoubleElements(a1));
  assertEquals([1.1,2,3,1.2,2], a1);

  a1 = [1,2,3].concat([{}]);
  assertTrue(%HasFastObjectElements(a1));
  assertEquals([1,2,3,{}], a1);
  a1 = [1.1,2,3].concat([{}]);
  assertTrue(%HasFastObjectElements(a1));
  assertEquals([1.1,2,3,{}], a1);
  a1 = [{}].concat([1,2,3]);
  assertTrue(%HasFastObjectElements(a1));
  assertEquals([{},1,2,3], a1);
  a1 = [{}].concat([1.1,2,3]);
  assertTrue(%HasFastObjectElements(a1));
  assertEquals([{},1.1,2,3], a1);

  // Slice
  var a2 = [1,2,3];
  assertTrue(%HasFastSmiElements(a2.slice()));
  assertTrue(%HasFastSmiElements(a2.slice(1)));
  assertTrue(%HasFastSmiElements(a2.slice(1, 2)));
  assertEquals([1,2,3], a2.slice());
  assertEquals([2,3], a2.slice(1));
  assertEquals([2], a2.slice(1,2));
  a2 = [1.1,2,3];
  assertTrue(%HasFastDoubleElements(a2.slice()));
  assertTrue(%HasFastDoubleElements(a2.slice(1)));
  assertTrue(%HasFastDoubleElements(a2.slice(1, 2)));
  assertEquals([1.1,2,3], a2.slice());
  assertEquals([2,3], a2.slice(1));
  assertEquals([2], a2.slice(1,2));
  a2 = [{},2,3];
  assertTrue(%HasFastObjectElements(a2.slice()));
  assertTrue(%HasFastObjectElements(a2.slice(1)));
  assertTrue(%HasFastObjectElements(a2.slice(1, 2)));
  assertEquals([{},2,3], a2.slice());
  assertEquals([2,3], a2.slice(1));
  assertEquals([2], a2.slice(1,2));

  // Splice
  var a3 = [1,2,3];
  var a3r;
  a3r = a3.splice(0, 0);
  assertTrue(%HasFastSmiElements(a3r));
  assertTrue(%HasFastSmiElements(a3));
  assertEquals([], a3r);
  assertEquals([1, 2, 3], a3);
  a3 = [1,2,3];
  a3r = a3.splice(0, 1);
  assertTrue(%HasFastSmiElements(a3r));
  assertTrue(%HasFastSmiElements(a3));
  assertEquals([1], a3r);
  assertEquals([2, 3], a3);
  a3 = [1,2,3];
  a3r = a3.splice(0, 0, 2);
  assertTrue(%HasFastSmiElements(a3r));
  assertTrue(%HasFastSmiElements(a3));
  assertEquals([], a3r);
  assertEquals([2, 1, 2, 3], a3);
  a3 = [1,2,3];
  a3r = a3.splice(0, 1, 2);
  assertTrue(%HasFastSmiElements(a3r));
  assertTrue(%HasFastSmiElements(a3));
  assertEquals([1], a3r);
  assertEquals([2, 2, 3], a3);

  a3 = [1.1,2,3];
  a3r = a3.splice(0, 0);
  assertTrue(%HasFastDoubleElements(a3r));
  assertTrue(%HasFastDoubleElements(a3));
  assertEquals([], a3r);
  assertEquals([1.1, 2, 3], a3);
  a3 = [1.1,2,3];
  a3r = a3.splice(0, 1);
  assertTrue(%HasFastDoubleElements(a3r));
  assertTrue(%HasFastDoubleElements(a3));
  assertEquals([1.1], a3r);
  assertEquals([2, 3], a3);
  a3 = [1.1,2,3];
  a3r = a3.splice(0, 0, 2);
  // Commented out since handled in js, which takes the best fit.
  // assertTrue(%HasFastDoubleElements(a3r));
  assertTrue(%HasFastSmiElements(a3r));
  assertTrue(%HasFastDoubleElements(a3));
  assertEquals([], a3r);
  assertEquals([2, 1.1, 2, 3], a3);
  a3 = [1.1,2,3];
  a3r = a3.splice(0, 1, 2);
  assertTrue(%HasFastDoubleElements(a3r));
  assertTrue(%HasFastDoubleElements(a3));
  assertEquals([1.1], a3r);
  assertEquals([2, 2, 3], a3);
  a3 = [1.1,2,3];
  a3r = a3.splice(0, 0, 2.1);
  // Commented out since handled in js, which takes the best fit.
  // assertTrue(%HasFastDoubleElements(a3r));
  assertTrue(%HasFastSmiElements(a3r));
  assertTrue(%HasFastDoubleElements(a3));
  assertEquals([], a3r);
  assertEquals([2.1, 1.1, 2, 3], a3);
  a3 = [1.1,2,3];
  a3r = a3.splice(0, 1, 2.2);
  assertTrue(%HasFastDoubleElements(a3r));
  assertTrue(%HasFastDoubleElements(a3));
  assertEquals([1.1], a3r);
  assertEquals([2.2, 2, 3], a3);
  a3 = [1,2,3];
  a3r = a3.splice(0, 0, 2.1);
  // Commented out since handled in js, which takes the best fit.
  // assertTrue(%HasFastDoubleElements(a3r));
  assertTrue(%HasFastSmiElements(a3r));
  assertTrue(%HasFastDoubleElements(a3));
  assertEquals([], a3r);
  assertEquals([2.1, 1, 2, 3], a3);
  a3 = [1,2,3];
  a3r = a3.splice(0, 1, 2.2);
  assertTrue(%HasFastDoubleElements(a3r));
  assertTrue(%HasFastDoubleElements(a3));
  assertEquals([1], a3r);
  assertEquals([2.2, 2, 3], a3);

  a3 = [{},2,3];
  a3r = a3.splice(0, 0);
  assertTrue(%HasFastObjectElements(a3r));
  assertTrue(%HasFastObjectElements(a3));
  assertEquals([], a3r);
  assertEquals([{}, 2, 3], a3);
  a3 = [1,2,{}];
  a3r = a3.splice(0, 1);
  assertTrue(%HasFastObjectElements(a3r));
  assertTrue(%HasFastObjectElements(a3));
  assertEquals([1], a3r);
  assertEquals([2, {}], a3);
  a3 = [1,2,3];
  a3r = a3.splice(0, 0, {});
  assertTrue(%HasFastObjectElements(a3r));
  assertTrue(%HasFastObjectElements(a3));
  assertEquals([], a3r);
  assertEquals([{}, 1, 2, 3], a3);
  a3 = [1,2,3];
  a3r = a3.splice(0, 1, {});
  assertTrue(%HasFastObjectElements(a3r));
  assertTrue(%HasFastObjectElements(a3));
  assertEquals([1], a3r);
  assertEquals([{}, 2, 3], a3);

  a3 = [1.1,2,3];
  a3r = a3.splice(0, 0, {});
  assertTrue(%HasFastObjectElements(a3r));
  assertTrue(%HasFastObjectElements(a3));
  assertEquals([], a3r);
  assertEquals([{}, 1.1, 2, 3], a3);
  a3 = [1.1,2,3];
  a3r = a3.splice(0, 1, {});
  assertTrue(%HasFastObjectElements(a3r));
  assertTrue(%HasFastObjectElements(a3));
  assertEquals([1.1], a3r);
  assertEquals([{}, 2, 3], a3);

  // Pop
  var a4 = [1,2,3];
  assertEquals(3, a4.pop());
  assertTrue(%HasFastSmiElements(a4));
  a4 = [1.1,2,3];
  assertEquals(3, a4.pop());
  assertTrue(%HasFastDoubleElements(a4));
  a4 = [{},2,3];
  assertEquals(3, a4.pop());
  assertTrue(%HasFastObjectElements(a4));

  // Shift
  var a4 = [1,2,3];
  assertEquals(1, a4.shift());
  assertTrue(%HasFastSmiElements(a4));
  a4 = [1.1,2,3];
  assertEquals(1.1, a4.shift());
  assertTrue(%HasFastDoubleElements(a4));
  a4 = [{},2,3];
  assertEquals({}, a4.shift());
  assertTrue(%HasFastObjectElements(a4));

  // Unshift
  var a4 = [1,2,3];
  a4.unshift(1);
  assertTrue(%HasFastSmiElements(a4));
  assertEquals([1,1,2,3], a4);
  a4 = [1,2,3];
  a4.unshift(1.1);
  // TODO(verwaest): We'll want to support double unshifting as well.
  // assertTrue(%HasFastDoubleElements(a4));
  assertTrue(%HasFastObjectElements(a4));
  assertEquals([1.1,1,2,3], a4);
  a4 = [1.1,2,3];
  a4.unshift(1);
  // assertTrue(%HasFastDoubleElements(a4));
  assertTrue(%HasFastObjectElements(a4));
  assertEquals([1,1.1,2,3], a4);
  a4 = [{},2,3];
  a4.unshift(1);
  assertTrue(%HasFastObjectElements(a4));
  assertEquals([1,{},2,3], a4);
  a4 = [{},2,3];
  a4.unshift(1.1);
  assertTrue(%HasFastObjectElements(a4));
  assertEquals([1.1,{},2,3], a4);
}

if (support_smi_only_arrays) {
  for (var i = 0; i < 3; i++) {
    array_natives_test();
  }
  %OptimizeFunctionOnNextCall(array_natives_test);
  array_natives_test();
}