bug-941049.js.svn-base

Google浏览器V8内核代码

// 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.

// This test fails because we copy the arguments array on indirect
// access

function g(f) {
  assertEquals(100, f.arguments = 100);  // read-only
  assertEquals(3, f.arguments.length);
  assertEquals(1, f.arguments[0]);
  assertEquals(2, f.arguments[1]);
  assertEquals(3, f.arguments[2]);
  f.arguments[0] = 999;
  f.arguments.extra = 'kallevip';
}

function h(f) {
  assertEquals('kallevip', f.arguments.extra);
  return f.arguments;
}

// Test function with a materialized arguments array.
function f0() {
  g(f0);
  var result = h(f0);
  var a = arguments;
  assertEquals(999, a[0]);
  return result;
}


// Test function without a materialized arguments array.
function f1(x) {
  g(f1);
  var result = h(f1);
  assertEquals(999, x);
  return result;
}


function test(f) {
  assertTrue(null === f.arguments);
  var args = f(1,2,3);
  assertTrue(null === f.arguments);

  assertEquals(3, args.length);
  assertEquals(999, args[0]);
  assertEquals(2, args[1]);
  assertEquals(3, args[2]);
  assertEquals('kallevip', args.extra);
}

test(f0);
test(f1);




function w() {
  return q.arguments;
}

function q(x, y) {
  x = 2;
  var result = w();
  y = 3;
  return result;
}

var a = q(0, 1);
// x is set locally *before* the last use of arguments before the
// activation of q is popped from the stack.
assertEquals(2, a[0]);
// y is set locally *after* the last use of arguments before the
// activation of q is popped from the stack.
assertEquals(1, a[1]);