tobool.js - mozsearch

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var success         = 0;

var expected_bool   = 0;

var expected_int    = 0;

var expected_double = 0;

var expected_string = 0;

var expected_object = 0;

var expected_symbol = 0;

function test_type_stable_ic() {

    // Initialize as falsy where possible.

    var a = undefined; // No Change, never succeeds

    var b = null;      // No Change, never succeeds

    var c = false;     // Alternate between true and false.

    var d = 0;         // Int32 cache checker, change int values

    var e = "";        // String cache checker, change string values

    var f = Symbol();  // No change, always succeed, no cache.

    var g = {};        // Change objects, always succeed.

    var h = -0;        // Double cache checker, change double values.

    for (var i =0; i < 30; i++) {

        // Switch between values to ensure the caches fire.

        switch (i % 3) {

            case 0:

                d = 0;

                e = "hi"; expected_string++;

                c = true; expected_bool++;

                h = 0;

                break;

            case 1:

                d = 1; expected_int++;

                e = "";

                c = false;

                h = NaN;

                break;

            case 2:

                d = 2; expected_int++;

                h = 1.234; expected_double++;

                g = {};

                break;

        if (a) { success++; }

        if (b) { success++; }

        if (c) { success++; }

        if (d) { success++; }

        if (e) { success++; }

        if (f) { success++; } expected_symbol++; // Symbol succeed

        if (g) { success++; } expected_object++; // Object success

        if (h) { success++; }

test_type_stable_ic();

assertEq(success, expected_bool + expected_double + expected_int + expected_object + expected_string + expected_symbol);

// Test cache failures.

function helper(fun, arg, n)

    var r = 0;

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

        r = fun(arg);

    return r ? 1 : 0;

function test_transition(fun, load, test, before, after) {

    var a = helper(fun, load, 30);

    var x = helper(fun, test, 5)

    assertEq(a, before);

    assertEq(x, after)

var fun1 = (x) => { if (x) return true; else return false; };

var fun2 = (x) => { if (x) return true; else return false; };

var fun3 = (x) => { if (x) return true; else return false; };

var fun4 = (x) => { if (x) return true; else return false; };

var fun5 = (x) => { if (x) return true; else return false; };

var fun6 = (x) => { if (x) return true; else return false; };

var fun7 = (x) => { if (x) return true; else return false; };

var fun8 = (x) => { if (x) return true; else return false; };

// NaN -> Int32

test_transition(fun1, NaN, 1, 0, 1);

test_transition(fun2, 1, NaN, 1, 0);

// NaN -> Object / Object -> NaN

test_transition(fun3, NaN, {}, 0, 1);

test_transition(fun4, {}, NaN, 1, 0);

// Object -> null / null -> Object

test_transition(fun5, {}, null, 1, 0);

test_transition(fun6, null, {},  0, 1);

// Symbol -> null, null -> Symbol

test_transition(fun7, Symbol('hi'), null, 1, 0);

test_transition(fun8, null, Symbol('lo'),  0, 1);