text: // 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.
  
  // Flags: --allow-natives-syntax
  
  /**
   * @fileoverview Check all sorts of borderline cases for charCodeAt.
   */
  
  function Cons() {
    return "Te" + "st testing 123";
  }
  
  
  function Deep() {
    var a = "T";
    a += "e";
    a += "s";
    a += "ting testing 123";
    return a;
  }
  
  
  function Slice() {
    return "testing Testing testing 123456789012345".substring(8, 22);
  }
  
  
  function Flat() {
    return "Testing testing 123";
  }
  
  function Cons16() {
    return "Te" + "\u1234t testing 123";
  }
  
  
  function Deep16() {
    var a = "T";
    a += "e";
    a += "\u1234";
    a += "ting testing 123";
    return a;
  }
  
  
  function Slice16Beginning() {
    return "Te\u1234t testing testing 123".substring(0, 14);
  }
  
  
  function Slice16Middle() {
    return "test Te\u1234t testing testing 123".substring(5, 19);
  }
  
  
  function Slice16End() {
    return "test Te\u1234t".substring(5, 9);
  }
  
  
  function Flat16() {
    return "Te\u1234ting testing 123";
  }
  
  
  function Thing() {
  }
  
  
  function NotAString() {
    var n = new Thing();
    n.toString = function() { return "Test"; };
    n.charCodeAt = String.prototype.charCodeAt;
    return n;
  }
  
  
  function NotAString16() {
    var n = new Thing();
    n.toString = function() { return "Te\u1234t"; };
    n.charCodeAt = String.prototype.charCodeAt;
    return n;
  }
  
  
  function TestStringType(generator, sixteen) {
    var g = generator;
    var len = g().toString().length;
    var t = sixteen ? "t" : "f"
    t += generator.name;
    assertTrue(isNaN(g().charCodeAt(-1e19)), 1 + t);
    assertTrue(isNaN(g().charCodeAt(-0x80000001)), 2 + t);
    assertTrue(isNaN(g().charCodeAt(-0x80000000)), 3 + t);
    assertTrue(isNaN(g().charCodeAt(-0x40000000)), 4 + t);
    assertTrue(isNaN(g().charCodeAt(-1)), 5 + t);
    assertTrue(isNaN(g().charCodeAt(len)), 6 + t);
    assertTrue(isNaN(g().charCodeAt(len + 1)), 7 + t);
    assertTrue(isNaN(g().charCodeAt(0x3fffffff)), 8 + t);
    assertTrue(isNaN(g().charCodeAt(0x7fffffff)), 9 + t);
    assertTrue(isNaN(g().charCodeAt(0x80000000)), 10 + t);
    assertTrue(isNaN(g().charCodeAt(1e9)), 11 + t);
    assertEquals(84, g().charCodeAt(0), 12 + t);
    assertEquals(84, g().charCodeAt("test"), 13 + t);
    assertEquals(84, g().charCodeAt(""), 14 + t);
    assertEquals(84, g().charCodeAt(null), 15 + t);
    assertEquals(84, g().charCodeAt(undefined), 16 + t);
    assertEquals(84, g().charCodeAt(), 17 + t);
    assertEquals(84, g().charCodeAt(void 0), 18 + t);
    assertEquals(84, g().charCodeAt(false), 19 + t);
    assertEquals(101, g().charCodeAt(true), 20 + t);
    assertEquals(101, g().charCodeAt(1), 21 + t);
    assertEquals(sixteen ? 0x1234 : 115, g().charCodeAt(2), 22 + t);
    assertEquals(116, g().charCodeAt(3), 23 + t);
    assertEquals(101, g().charCodeAt(1.1), 24 + t);
    assertEquals(sixteen ? 0x1234 : 115, g().charCodeAt(2.1718), 25 + t);
    assertEquals(116, g().charCodeAt(3.14159), 26 + t);
  }
  
  TestStringType(Cons, false);
  TestStringType(Deep, false);
  TestStringType(Slice, false);
  TestStringType(Flat, false);
  TestStringType(NotAString, false);
  TestStringType(Cons16, true);
  TestStringType(Deep16, true);
  TestStringType(Slice16Beginning, true);
  TestStringType(Slice16Middle, true);
  TestStringType(Slice16End, true);
  TestStringType(Flat16, true);
  TestStringType(NotAString16, true);
  
  function Flat16Optimized() {
    var str = Flat16();
    return str.charCodeAt(2);
  }
  
  assertEquals(0x1234, Flat16Optimized());
  assertEquals(0x1234, Flat16Optimized());
  %OptimizeFunctionOnNextCall(Flat16Optimized);
  assertEquals(0x1234, Flat16Optimized());
  
  function ConsNotSmiIndex() {
    var str = Cons();
    assertTrue(isNaN(str.charCodeAt(0x7fffffff)));
  }
  
  for (var i = 0; i < 5; i++) {
    ConsNotSmiIndex();
  }
  %OptimizeFunctionOnNextCall(ConsNotSmiIndex);
  ConsNotSmiIndex();
  
  
  for (var i = 0; i != 10; i++) {
    assertEquals(101, Cons16().charCodeAt(1.1));
    assertEquals('e', Cons16().charAt(1.1));
  }
  
  function StupidThing() {
    // Doesn't return a string from toString!
    this.toString = function() { return 42; }
    this.charCodeAt = String.prototype.charCodeAt;
  }
  
  assertEquals(52, new StupidThing().charCodeAt(0), 27);
  assertEquals(50, new StupidThing().charCodeAt(1), 28);
  assertTrue(isNaN(new StupidThing().charCodeAt(2)), 29);
  assertTrue(isNaN(new StupidThing().charCodeAt(-1)), 30);
  
  
  // Medium (>255) and long (>65535) strings.
  
  var medium = "12345678";
  medium += medium; // 16.
  medium += medium; // 32.
  medium += medium; // 64.
  medium += medium; // 128.
  medium += medium; // 256.
  
  var long = medium;
  long += long + long + long;     // 1024.
  long += long + long + long;     // 4096.
  long += long + long + long;     // 16384.
  long += long + long + long;     // 65536.
  
  assertTrue(isNaN(medium.charCodeAt(-1)), 31);
  assertEquals(49, medium.charCodeAt(0), 32);
  assertEquals(56, medium.charCodeAt(255), 33);
  assertTrue(isNaN(medium.charCodeAt(256)), 34);
  
  assertTrue(isNaN(long.charCodeAt(-1)), 35);
  assertEquals(49, long.charCodeAt(0), 36);
  assertEquals(56, long.charCodeAt(65535), 37);
  assertTrue(isNaN(long.charCodeAt(65536)), 38);
  
  
  // Test crankshaft code when the function is set directly on the
  // string prototype object instead of the hidden prototype object.
  // See http://code.google.com/p/v8/issues/detail?id=1070
  
  String.prototype.x = String.prototype.charCodeAt;
  
  function directlyOnPrototype() {
    assertEquals(97, "a".x(0));
    assertEquals(98, "b".x(0));
    assertEquals(99, "c".x(0));
    assertEquals(97, "a".x(0));
    assertEquals(98, "b".x(0));
    assertEquals(99, "c".x(0));
  }
  
  for (var i = 0; i < 5; i++) {
    directlyOnPrototype();
  }
  %OptimizeFunctionOnNextCall(directlyOnPrototype);
  directlyOnPrototype();
  
  assertTrue(isNaN(%_StringCharCodeAt("ABC", -1)));
  assertTrue(isNaN(%_StringCharCodeAt("ABC", 4)));
  