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      1 // Copyright 2010 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 // Flags: --allow-natives-syntax
     29 
     30 // Test String.fromCharCode.
     31 
     32 // Test char codes larger than 0xffff.
     33 var expected = "";
     34 for (var i = 100; i < 500; i++) {
     35   expected += String.fromCharCode(i);
     36 }
     37 
     38 function testCharCodeTruncation() {
     39   var result = "";
     40   for (var i = 0x100000 + 100; i < 0x100000 + 500; i++) {
     41     result += String.fromCharCode(i);
     42   }
     43   assertEquals(String.fromCharCode(0xFFFF), String.fromCharCode(0xFFFFFFFF));
     44   return result;
     45 }
     46 
     47 assertEquals(expected, testCharCodeTruncation());
     48 assertEquals(expected, testCharCodeTruncation());
     49 %OptimizeFunctionOnNextCall(testCharCodeTruncation);
     50 assertEquals(expected, testCharCodeTruncation());
     51 
     52 // Test various receivers and arguments passed to String.fromCharCode.
     53 
     54 Object.prototype.fromCharCode = function(x) { return this; };
     55 
     56 var fcc = String.fromCharCode;
     57 var fcc2 = fcc;
     58 
     59 function constFun(x) { return function(y) { return x; }; }
     60 
     61 function test(num) {
     62   assertEquals(" ", String.fromCharCode(0x20));
     63   assertEquals(" ", String.fromCharCode(0x20 + 0x10000));
     64   assertEquals(" ", String.fromCharCode(0x20 - 0x10000));
     65   assertEquals(" ", String.fromCharCode(0x20 + 0.5));
     66 
     67   assertEquals("\u1234", String.fromCharCode(0x1234));
     68   assertEquals("\u1234", String.fromCharCode(0x1234 + 0x10000));
     69   assertEquals("\u1234", String.fromCharCode(0x1234 - 0x10000));
     70   assertEquals("\u1234", String.fromCharCode(0x1234 + 0.5));
     71 
     72   assertEquals("  ", String.fromCharCode(0x20, 0x20));
     73   assertEquals("  ", String.fromCharCode(0x20 + 0.5, 0x20));
     74 
     75   assertEquals(" ", fcc(0x20));
     76   assertEquals(" ", fcc(0x20 + 0x10000));
     77   assertEquals(" ", fcc(0x20 - 0x10000));
     78   assertEquals(" ", fcc(0x20 + 0.5));
     79 
     80   assertEquals("\u1234", fcc(0x1234));
     81   assertEquals("\u1234", fcc(0x1234 + 0x10000));
     82   assertEquals("\u1234", fcc(0x1234 - 0x10000));
     83   assertEquals("\u1234", fcc(0x1234 + 0.5));
     84 
     85   assertEquals("  ", fcc(0x20, 0x20));
     86   assertEquals("  ", fcc(0x20 + 0.5, 0x20));
     87 
     88   var receiver = (num < 5) ? String : (num < 9) ? "dummy" : 42;
     89   fcc2 = (num < 5) ? fcc
     90                    : (num < 9) ? constFun(Object("dummy"))
     91                                : constFun(Object(42));
     92   var expected = (num < 5) ? " " : (num < 9) ? Object("dummy") : Object(42);
     93   assertEquals(expected, receiver.fromCharCode(0x20));
     94   assertEquals(expected, receiver.fromCharCode(0x20 - 0x10000));
     95   assertEquals(expected, receiver.fromCharCode(0x20 + 0.5));
     96   assertEquals(expected, fcc2(0x20));
     97   assertEquals(expected, fcc2(0x20 - 0x10000));
     98   assertEquals(expected, fcc2(0x20 + 0.5));
     99 }
    100 
    101 // Use loop to test the custom IC.
    102 for (var i = 0; i < 10; i++) {
    103   test(i);
    104 }
    105 
    106 assertEquals("AAAA", String.fromCharCode(65, 65, 65, 65));
    107 assertEquals("AAAA", String.fromCharCode(65, 65, 65, 65));
    108 %OptimizeFunctionOnNextCall(String.fromCharCode);
    109 assertEquals("AAAA", String.fromCharCode(65, 65, 65, 65));
    110 
    111 // Test the custom IC works correctly when the map changes.
    112 for (var i = 0; i < 10; i++) {
    113   var expected = (i < 5) ? " " : 42;
    114   if (i == 5) String.fromCharCode = function() { return 42; };
    115   assertEquals(expected, String.fromCharCode(0x20));
    116 }
    117