v8/test/mjsunit/deep-recursion.js

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// Copyright 2008 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
/**
* @fileoverview Check that flattening deep trees of cons strings does not
* cause stack overflows.
*/
function newdeep(start, depth) {
var d = start;
for (var i = 0; i < depth; i++) {
d = d + "f";
}
return d;
}
var default_depth = 110000;
var deep = newdeep("foo", default_depth);
assertEquals('f', deep[0]);
var cmp1 = newdeep("a", default_depth);
var cmp2 = newdeep("b", default_depth);
assertEquals(-1, cmp1.localeCompare(cmp2), "ab");
var cmp2empty = newdeep("c", default_depth);
assertTrue(cmp2empty.localeCompare("") > 0, "c");
var cmp3empty = newdeep("d", default_depth);
assertTrue("".localeCompare(cmp3empty) < 0), "d";
var slicer_depth = 1100;
var slicer = newdeep("slice", slicer_depth);
for (i = 0; i < slicer_depth + 4; i += 2) {
slicer = slicer.slice(1, -1);
}
assertEquals("f", slicer[0]);
assertEquals(1, slicer.length);