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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.
+
+
+// Simple framework for running the benchmark suites and
+// computing a score based on the timing measurements.
+
+
+// A benchmark has a name (string) and a function that will be run to
+// do the performance measurement.
+function Benchmark(name, run) {
+  this.name = name;
+  this.run = run;
+}
+
+
+// Benchmark results hold the benchmark and the measured time used to
+// run the benchmark. The benchmark score is computed later once a
+// full benchmark suite has run to completion.
+function BenchmarkResult(benchmark, time) {
+  this.benchmark = benchmark;
+  this.time = time;
+}
+
+
+// Automatically convert results to numbers. Used by the geometric
+// mean computation.
+BenchmarkResult.prototype.valueOf = function() {
+  return this.time;
+}
+
+
+// Suites of benchmarks consist of a name and the set of benchmarks in
+// addition to the reference timing that the final score will be based
+// on. This way, all scores are relative to a reference run and higher
+// scores implies better performance.
+function BenchmarkSuite(name, reference, benchmarks) {
+  this.name = name;
+  this.reference = reference;
+  this.benchmarks = benchmarks;
+  BenchmarkSuite.suites.push(this);
+}
+
+
+// Keep track of all declared benchmark suites.
+BenchmarkSuite.suites = [];
+
+
+// Scores are not comparable across versions. Bump the version if
+// you're making changes that will affect that scores, e.g. if you add
+// a new benchmark or change an existing one.
+BenchmarkSuite.version = '3';
+
+
+// To make the benchmark results predictable, we replace Math.random
+// with a 100% deterministic alternative.
+Math.random = (function() {
+  var seed = 49734321;
+  return function() {
+    // Robert Jenkins' 32 bit integer hash function.
+    seed = ((seed + 0x7ed55d16) + (seed << 12))  & 0xffffffff;
+    seed = ((seed ^ 0xc761c23c) ^ (seed >>> 19)) & 0xffffffff;
+    seed = ((seed + 0x165667b1) + (seed << 5))   & 0xffffffff;
+    seed = ((seed + 0xd3a2646c) ^ (seed << 9))   & 0xffffffff;
+    seed = ((seed + 0xd3a2646c) ^ (seed << 9))   & 0xffffffff;
+    seed = ((seed + 0xfd7046c5) + (seed << 3))   & 0xffffffff;
+    seed = ((seed ^ 0xb55a4f09) ^ (seed >>> 16)) & 0xffffffff;
+    return (seed & 0xfffffff) / 0x10000000;
+  };
+})();
+
+
+// Runs all registered benchmark suites and optionally yields between
+// each individual benchmark to avoid running for too long in the
+// context of browsers. Once done, the final score is reported to the
+// runner.
+BenchmarkSuite.RunSuites = function(runner) {
+  var continuation = null;
+  var suites = BenchmarkSuite.suites;
+  var length = suites.length;
+  BenchmarkSuite.scores = [];
+  var index = 0;
+  function RunStep() {
+    while (continuation || index < length) {
+      if (continuation) {
+        continuation = continuation();
+      } else {
+        var suite = suites[index++];
+        if (runner.NotifyStart) runner.NotifyStart(suite.name);
+        continuation = suite.RunStep(runner);
+      }
+      if (continuation && typeof window != 'undefined' && window.setTimeout) {
+        window.setTimeout(RunStep, 100);
+        return;
+      }
+    }
+    if (runner.NotifyScore) {
+      var score = BenchmarkSuite.GeometricMean(BenchmarkSuite.scores);
+      var formatted = BenchmarkSuite.FormatScore(100 * score);
+      runner.NotifyScore(formatted);
+    }
+  }
+  RunStep();
+}
+
+
+// Counts the total number of registered benchmarks. Useful for
+// showing progress as a percentage.
+BenchmarkSuite.CountBenchmarks = function() {
+  var result = 0;
+  var suites = BenchmarkSuite.suites;
+  for (var i = 0; i < suites.length; i++) {
+    result += suites[i].benchmarks.length;
+  }
+  return result;
+}
+
+
+// Computes the geometric mean of a set of numbers.
+BenchmarkSuite.GeometricMean = function(numbers) {
+  var log = 0;
+  for (var i = 0; i < numbers.length; i++) {
+    log += Math.log(numbers[i]);
+  }
+  return Math.pow(Math.E, log / numbers.length);
+}
+
+
+// Converts a score value to a string with at least three significant
+// digits.
+BenchmarkSuite.FormatScore = function(value) {
+  if (value > 100) {
+    return value.toFixed(0);
+  } else {
+    return value.toPrecision(3);
+  }
+}
+
+// Notifies the runner that we're done running a single benchmark in
+// the benchmark suite. This can be useful to report progress.
+BenchmarkSuite.prototype.NotifyStep = function(result) {
+  this.results.push(result);
+  if (this.runner.NotifyStep) this.runner.NotifyStep(result.benchmark.name);
+}
+
+
+// Notifies the runner that we're done with running a suite and that
+// we have a result which can be reported to the user if needed.
+BenchmarkSuite.prototype.NotifyResult = function() {
+  var mean = BenchmarkSuite.GeometricMean(this.results);
+  var score = this.reference / mean;
+  BenchmarkSuite.scores.push(score);
+  if (this.runner.NotifyResult) {
+    var formatted = BenchmarkSuite.FormatScore(100 * score);
+    this.runner.NotifyResult(this.name, formatted);
+  }
+}
+
+
+// Notifies the runner that running a benchmark resulted in an error.
+BenchmarkSuite.prototype.NotifyError = function(error) {
+  if (this.runner.NotifyError) {
+    this.runner.NotifyError(this.name, error);
+  }
+  if (this.runner.NotifyStep) {
+    this.runner.NotifyStep(this.name);
+  }
+}
+
+
+// Runs a single benchmark for at least a second and computes the
+// average time it takes to run a single iteration.
+BenchmarkSuite.prototype.RunSingle = function(benchmark) {
+  var elapsed = 0;
+  var start = new Date();
+  for (var n = 0; elapsed < 1000; n++) {
+    benchmark.run();
+    elapsed = new Date() - start;
+  }
+  var usec = (elapsed * 1000) / n;
+  this.NotifyStep(new BenchmarkResult(benchmark, usec));
+}
+
+
+// This function starts running a suite, but stops between each
+// individual benchmark in the suite and returns a continuation
+// function which can be invoked to run the next benchmark. Once the
+// last benchmark has been executed, null is returned.
+BenchmarkSuite.prototype.RunStep = function(runner) {
+  this.results = [];
+  this.runner = runner;
+  var length = this.benchmarks.length;
+  var index = 0;
+  var suite = this;
+  function RunNext() {
+    if (index < length) {
+      try {
+        suite.RunSingle(suite.benchmarks[index++]);
+      } catch (e) {
+        suite.NotifyError(e);
+        return null;
+      }
+      return RunNext;
+    }
+    suite.NotifyResult();
+    return null;
+  }
+  return RunNext();
+}