src/v8/test/mjsunit/string-fromcharcode.js

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  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 }