DataView-construct-arguments-detaching.js

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/*

 * Any copyright is dedicated to the Public Domain.

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

*/

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

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

var BUGNUMBER = 991981;

var summary =

  "new DataView(...) shouldn't misbehave horribly if index-argument " +

  "conversion detaches the ArrayBuffer to be viewed";

print(BUGNUMBER + ": " + summary);

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

 * BEGIN TEST *

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

function testByteOffset()

  var ab = new ArrayBuffer(0x1000);

  var start =

      valueOf: function()

        detachArrayBuffer(ab);

        gc();

        return 0x800;

};

  var ok = false;

try

    new DataView(ab, start);

  catch (e)

    ok = true;

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

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

testByteOffset();

function testByteLength()

  var ab = new ArrayBuffer(0x1000);

  var len =

      valueOf: function()

        detachArrayBuffer(ab);

        gc();

        return 0x800;

};

  var ok = false;

try

    new DataView(ab, 0x800, len);

  catch (e)

    ok = true;

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

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

testByteLength();

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

if (typeof reportCompare === "function")

  reportCompare(true, true);

print("Tests complete");