megamorphic-get-has-dense.js

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setJitCompilerOption("ic.force-megamorphic", 1);

function testBasic() {

  // Create various native objects with dense elements.

  var objs = [[1, 2, 3], {0: 1, 1: 2, 2: 3}];

  var fun = x => x;

  fun[0] = 1;

  fun[1] = 2;

  fun[2] = 3;

  objs.push(fun);

  for (var i = 0; i < 20; i++) {

    var o = {};

    o["x" + i] = i;

    o[0] = 1;

    o[1] = 2;

    if (i < 10) {

      o[2] = 3;

    } else {

      // o[2] will be a hole.

      o[3] = 4;

    objs.push(o);

  // Access their dense elements.

  for (var i = 0; i < 10; i++) {

    for (var j = 0; j < objs.length; j++) {

      var obj = objs[j];

      assertEq(obj[0], 1);

      assertEq(obj[1], 2);

      assertEq(obj[2], j < 13 ? 3 : undefined);

      assertEq(obj[3], j >= 13 ? 4 : undefined);

      assertEq(0 in obj, true);

      assertEq(1 in obj, true);

      assertEq(2 in obj, j < 13);

      assertEq(3 in obj, j >= 13);

      assertEq(Object.hasOwn(obj, 0), true);

      assertEq(Object.hasOwn(obj, 1), true);

      assertEq(Object.hasOwn(obj, 2), j < 13);

      assertEq(Object.hasOwn(obj, 3), j >= 13);

testBasic();

function testNonNative() {

  var arr = [1, 2, 3];

  var proxy = new Proxy({}, {

    get(target, prop) { return 456; },

    has(target, prop) { return prop === "0"; },

});

  for (var i = 0; i < 100; i++) {

    var obj = i < 95 ? arr : proxy;

    assertEq(obj[0], i < 95 ? 1 : 456);

    assertEq(0 in obj, true);

    assertEq(1 in obj, i < 95);

    assertEq(4 in obj, false);

    assertEq(Object.hasOwn(obj, 0), i < 95);

    assertEq(Object.hasOwn(obj, 1), i < 95);

    assertEq(Object.hasOwn(obj, 4), false);

testNonNative();