typedarray-copyWithin-arguments-detaching.js

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/*

 * Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/licenses/publicdomain/

*/

var gTestfile = "typedarray-copyWithin-arguments-detaching.js";

//-----------------------------------------------------------------------------

var BUGNUMBER = 991981;

var summary =

  "%TypedArray.prototype.copyWithin shouldn't misbehave horribly if " +

  "index-argument conversion detaches the underlying ArrayBuffer";

print(BUGNUMBER + ": " + summary);

/**************

 * BEGIN TEST *

 **************/

function testBegin()

  var ab = new ArrayBuffer(0x1000);

  var begin =

      valueOf: function()

        detachArrayBuffer(ab);

        return 0x800;

};

  var ta = new Uint8Array(ab);

  var ok = false;

try

    ta.copyWithin(0, begin, 0x1000);

  catch (e)

    ok = true;

  assertEq(ok, true, "start weirdness should have thrown");

  assertEq(ab.byteLength, 0, "detaching should work for start weirdness");

testBegin();

function testEnd()

  var ab = new ArrayBuffer(0x1000);

  var end =

      valueOf: function()

        detachArrayBuffer(ab);

        return 0x1000;

};

  var ta = new Uint8Array(ab);

  var ok = false;

try

    ta.copyWithin(0, 0x800, end);

  catch (e)

    ok = true;

  assertEq(ok, true, "start weirdness should have thrown");

  assertEq(ab.byteLength, 0, "detaching should work for start weirdness");

testEnd();

function testDest()

  var ab = new ArrayBuffer(0x1000);

  var dest =

      valueOf: function()

        detachArrayBuffer(ab);

        return 0;

};

  var ta = new Uint8Array(ab);

  var ok = false;

try

    ta.copyWithin(dest, 0x800, 0x1000);

  catch (e)

    ok = true;

  assertEq(ok, true, "start weirdness should have thrown");

  assertEq(ab.byteLength, 0, "detaching should work for start weirdness");

testDest();

/******************************************************************************/

if (typeof reportCompare === "function")

  reportCompare(true, true);

print("Tests complete");