DataView-set-arguments-detaching.js

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/*

 * Any copyright is dedicated to the Public Domain.

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

*/

var gTestfile = "DataView-set-arguments-detaching.js";

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

var BUGNUMBER = 991981;

var summary =

  "DataView.prototype.set* methods shouldn't misbehave horribly if " +

  "index-argument conversion detaches the ArrayBuffer being modified";

print(BUGNUMBER + ": " + summary);

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

 * BEGIN TEST *

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

function testIndex()

  var ab = new ArrayBuffer(0x1000);

  var dv = new DataView(ab);

  var start =

      valueOf: function()

        detachArrayBuffer(ab);

        gc();

        return 0xFFF;

};

  var ok = false;

try

    dv.setUint8(start, 0x42);

  catch (e)

    ok = true;

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

  assertEq(ab.byteLength, 0, "should have been detached correctly");

testIndex();

function testValue()

  var ab = new ArrayBuffer(0x100000);

  var dv = new DataView(ab);

  var value =

      valueOf: function()

        detachArrayBuffer(ab);

        gc();

        return 0x42;

};

  var ok = false;

try

    dv.setUint8(0xFFFFF, value);

  catch (e)

    ok = true;

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

  assertEq(ab.byteLength, 0, "should have been detached correctly");

testValue();

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

if (typeof reportCompare === "function")

  reportCompare(true, true);

print("Tests complete");