set-same-buffer-different-source-target-types.js

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/*

 * Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/publicdomain/zero/1.0/

*/

var gTestfile = "set-same-buffer-different-source-target-types.js";

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

var BUGNUMBER = 896116;

var summary =

  "When setting a typed array from an overlapping typed array of different " +

  "element type, copy the source elements into properly-sized temporary " +

  "memory, and properly copy them into the target without overflow (of " +

  "either source *or* target) when finished";

print(BUGNUMBER + ": " + summary);

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

 * BEGIN TEST *

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

// smallest 2**n triggering segfaults in a pre-patch build locally, then

// quadrupled in case the boundary ever changes, or is different in some other

// memory-allocating implementation

var srclen = 65536;

var ta = new Uint8Array(srclen * Float64Array.BYTES_PER_ELEMENT);

var ta2 = new Float64Array(ta.buffer, 0, srclen);

ta.set(ta2);

// This test mostly exists to check for no crash above, but it's worth testing

// for no uninitialized memory (in case of buffer overflow) being copied into

// the array, too.

for (var i = 0, len = ta.length; i < len; i++)

  assertEq(ta[i], 0, "zero-bits double should convert to zero");

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

if (typeof reportCompare === "function")

  reportCompare(true, true);

print("Tests complete");