The Tor Browser: js/src/jit-test/tests/basic/bug653153.js@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 // ES5 15.1.2.2 step 1

     3 /*

     4  * Boundary testing for super-large positive numbers between non-exponential

     5  * and in-exponential-form.

     6  *

     7  * NB: While 1e21 is exactly representable as an IEEE754 double-precision

     8  * number, its nearest neighboring representable values are a good distance

     9  * away, 65536 to be precise.

    10  */

    12 // This is the boundary in theory.

    13 assertEq(parseInt(1e21), 1);

    15 // This is the boundary in practice.

    16 assertEq(parseInt(1e21 - 65537) > 1e20, true);

    17 assertEq(parseInt(1e21 - 65536), 1);

    18 assertEq(parseInt(1e21 + 65536), 1);

    20 // Check that we understand floating point accuracy near the boundary

    21 assertEq(1e21 - 65537 !== 1e21 - 65536, true);

    22 assertEq(1e21 - 65536, 1e21);

    23 assertEq(1e21 + 65535, 1e21);

    24 assertEq(1e21 + 65536, 1e21);

    26 // ES5 leaves exact precision in ToString(bigMagNum) undefined, which

    27 // might make this value inconsistent across implementations (maybe,

    28 // nobody's done the math here).  Regardless, it's definitely a number

    29 // very close to 1, and not a large-magnitude positive number.

    30 assertEq(1e21 + 65537 !== 1e21, true);

    31 assertEq(parseInt(1e21 + 65537) < 1.001, true);

    34 /*

    35  * Now do the same tests for super-large negative numbers crossing the

    36  * opposite boundary.

    37  */

    39 // This is the boundary in theory.

    40 assertEq(parseInt(-1e21), -1);

    42 // This is the boundary in practice.

    43 assertEq(parseInt(-1e21 + 65537) < -1e20, true);

    44 assertEq(parseInt(-1e21 + 65536), -1);

    45 assertEq(parseInt(-1e21 - 65536), -1);

    47 // Check that we understand floating point accuracy near the boundary

    48 assertEq(-1e21 + 65537 !== -1e21 + 65536, true);

    49 assertEq(-1e21 + 65536, -1e21);

    50 assertEq(-1e21 - 65535, -1e21);

    51 assertEq(-1e21 - 65536, -1e21);

    53 // ES5 leaves exact precision in ToString(bigMagNum) undefined, which

    54 // might make this value inconsistent across implementations (maybe,

    55 // nobody's done the math here).  Regardless, it's definitely a number

    56 // very close to -1, and not a large-magnitude negative number.

    57 assertEq(-1e21 - 65537 !== 1e21, true);

    58 assertEq(parseInt(-1e21 - 65537) > -1.001, true);

    61 /* Check values around the boundary. */

    62 arr = [1e0, 5e1, 9e19, 0.1e20, 1.3e20, 1e20, 9e20, 9.99e20, 0.1e21,

    63        1e21, 1.0e21, 2e21, 2e20, 2.1e22, 9e21, 0.1e22, 1e22, 3e46, 3e23, 3e100, 3.4e200, 7e1000,

    64        1e21, 1e21+65537, 1e21+65536, 1e21-65536, 1e21-65537];

    66 /* Check across a range of values in case we missed anything. */

    67 for (var i = 0; i < 4000; i++) {

    68     arr.push(1e19 + i*1e19);

    69 }

    71 for (var i in arr) {

    72     assertEq(parseInt( arr[i]), parseInt(String( arr[i])));

    73     assertEq(parseInt(-arr[i]), parseInt(String(-arr[i])));

    74 }

The Tor Browser / file revision