90b3370374
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5922 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
108 lines
3.9 KiB
JavaScript
108 lines
3.9 KiB
JavaScript
// Copyright 2010 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Flags: --always-opt --nocompilation-cache
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// Given a binary operation string and an ordered array of leaf
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// strings, return an array of all binary tree strings with the leaves
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// (in order) as the fringe.
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function makeTrees(op, leaves) {
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var len = leaves.length;
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if (len == 1) {
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// One leaf is a leaf.
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return leaves;
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} else {
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// More than one leaf requires an interior node.
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var result = [];
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// Split the leaves into left and right subtrees in all possible
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// ways. For each split recursively compute all possible subtrees.
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for (var i = 1; i < len; ++i) {
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var leftTrees = makeTrees(op, leaves.slice(0, i));
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var rightTrees = makeTrees(op, leaves.slice(i, len));
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// Adjoin every possible left and right subtree.
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for (var j = 0; j < leftTrees.length; ++j) {
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for (var k = 0; k < rightTrees.length; ++k) {
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var string = "(" + leftTrees[j] + op + rightTrees[k] + ")";
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result.push(string);
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}
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}
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}
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return result;
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}
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}
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// All 429 possible bitwise OR trees with eight leaves.
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var identifiers = ['a','b','c','d','e','f','g','h'];
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var or_trees = makeTrees("|", identifiers);
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var and_trees = makeTrees("&", identifiers);
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// Set up leaf masks to set 8 least-significant bits.
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var a = 1 << 0;
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var b = 1 << 1;
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var c = 1 << 2;
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var d = 1 << 3;
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var e = 1 << 4;
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var f = 1 << 5;
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var g = 1 << 6;
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var h = 1 << 7;
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for (var i = 0; i < or_trees.length; ++i) {
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for (var j = 0; j < 8; ++j) {
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var or_fun = new Function("return " + or_trees[i]);
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if (j == 0) assertEquals(255, or_fun());
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// Set the j'th variable to a string to force a bailout.
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eval(identifiers[j] + "+= ''");
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assertEquals(255, or_fun());
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// Set it back to a number for the next iteration.
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eval(identifiers[j] + "= +" + identifiers[j]);
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}
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}
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// Set up leaf masks to clear 8 least-significant bits.
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a ^= 255;
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b ^= 255;
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c ^= 255;
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d ^= 255;
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e ^= 255;
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f ^= 255;
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g ^= 255;
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h ^= 255;
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for (i = 0; i < and_trees.length; ++i) {
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for (var j = 0; j < 8; ++j) {
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var and_fun = new Function("return " + and_trees[i]);
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if (j == 0) assertEquals(0, and_fun());
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// Set the j'th variable to a string to force a bailout.
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eval(identifiers[j] + "+= ''");
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assertEquals(0, and_fun());
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// Set it back to a number for the next iteration.
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eval(identifiers[j] + "= +" + identifiers[j]);
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}
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}
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