deep-recursion.js 2.41 KB
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// Copyright 2008 the V8 project authors. All rights reserved.
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// 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
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//       with the distribution.
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//
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// 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.
 */

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function newdeep(start, depth) {
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  var d = start;
  for (var i = 0; i < depth; i++) {
    d = d + "f";
  }
  return d;
}

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var default_depth = 110000;

var deep = newdeep("foo", default_depth);
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assertEquals('f', deep[0]);

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var cmp1 = newdeep("a", default_depth);
var cmp2 = newdeep("b", default_depth);
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assertEquals(-1, cmp1.localeCompare(cmp2), "ab");

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var cmp2empty = newdeep("c", default_depth);
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assertTrue(cmp2empty.localeCompare("") > 0, "c");

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var cmp3empty = newdeep("d", default_depth);
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assertTrue("".localeCompare(cmp3empty) < 0), "d";

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var slicer_depth = 1100;

var slicer = newdeep("slice", slicer_depth);
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for (i = 0; i < slicer_depth + 4; i += 2) {
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  slicer =  slicer.slice(1, -1);
}

assertEquals("f", slicer[0]);
assertEquals(1, slicer.length);