string-externalize.js revision 3ef787dbeca8a5fb1086949cda830dccee07bfbd 
1// Copyright 2010 the V8 project authors. All rights reserved.
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27
28// Flags: --expose-externalize-string --expose-gc
29
30var size = 1024;
31
32function test() {
33  var str = "";
34
35  // Build an ascii cons string.
36  for (var i = 0; i < size; i++) {
37      str += String.fromCharCode(i & 0x7f);
38  }
39  assertTrue(isAsciiString(str));
40
41  var twoByteExternalWithAsciiData =
42      "AA" + (function() { return "A"; })();
43  externalizeString(twoByteExternalWithAsciiData, true /* force two-byte */);
44  assertFalse(isAsciiString(twoByteExternalWithAsciiData));
45
46  var realTwoByteExternalString =
47      "\u1234\u1234\u1234\u1234" + (function() { return "\u1234"; })();
48  externalizeString(realTwoByteExternalString);
49  assertFalse(isAsciiString(realTwoByteExternalString));
50
51  assertTrue(isAsciiString(["a", twoByteExternalWithAsciiData].join("")));
52
53  // Appending a two-byte string that contains only ascii chars should
54  // still produce an ascii cons.
55  var str1 = str + twoByteExternalWithAsciiData;
56  assertTrue(isAsciiString(str1));
57
58  // Force flattening of the string.
59  var old_length = str1.length - twoByteExternalWithAsciiData.length;
60  for (var i = 0; i < old_length; i++) {
61    assertEquals(String.fromCharCode(i & 0x7f), str1[i]);
62  }
63  for (var i = old_length; i < str1.length; i++) {
64    assertEquals("A", str1[i]);
65  }
66
67  // Flattened string should still be ascii.
68  assertTrue(isAsciiString(str1));
69
70  // Lower-casing an ascii string should produce ascii.
71  assertTrue(isAsciiString(str1.toLowerCase()));
72
73  assertFalse(isAsciiString(["a", realTwoByteExternalString].join("")));
74
75  // Appending a real two-byte string should produce a two-byte cons.
76  var str2 = str + realTwoByteExternalString;
77  assertFalse(isAsciiString(str2));
78
79  // Force flattening of the string.
80  old_length = str2.length - realTwoByteExternalString.length;
81  for (var i = 0; i < old_length; i++) {
82    assertEquals(String.fromCharCode(i & 0x7f), str2[i]);
83  }
84  for (var i = old_length; i < str.length; i++) {
85    assertEquals("\u1234", str2[i]);
86  }
87
88  // Flattened string should still be two-byte.
89  assertFalse(isAsciiString(str2));
90}
91
92// Run the test many times to ensure IC-s don't break things.
93for (var i = 0; i < 10; i++) {
94  test();
95}
96
97// Clean up string to make Valgrind happy.
98gc();
99gc();
100