v8/test/mjsunit/regress/regress-1423.js

// Copyright 2011 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.

// Flags: --allow-natives-syntax

// Test that the Lithium environment iterator does stop iteration early.
"use strict";

function f0() {
  return f1('literal', true);
};
%PrepareFunctionForOptimization(f0);
function f1(x, y) {
  return f2(x, y);
}

// Because it's strict, f2 has an environment containing only the constants
// undefined, 'literal', and false.  Bug 1423 would cause environment
// iteration to stop early.
//
// Bug manifests as UNREACHABLE code (due to an unallocated register) in
// debug builds.
function f2(x, y) {
  if (y) {
    if (f3(x, 'other-literal')) {
      return 0;
    } else {
      return 1;
    }
  } else {
    return 2;
  }
}

function f3(x, y) {
  return x === y;
}

for (var i = 0; i < 5; ++i) f0();
%OptimizeFunctionOnNextCall(f0);
assertEquals(1, f0());