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: --expose-externalize-string --expose-gc 29 30 var size = 1024; 31 32 function 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(isOneByteString(str)); 40 41 var twoByteExternalWithOneByteData = 42 "AA" + (function() { return "A"; })(); 43 externalizeString(twoByteExternalWithOneByteData, true /* force two-byte */); 44 assertFalse(isOneByteString(twoByteExternalWithOneByteData)); 45 46 var realTwoByteExternalString = 47 "\u1234\u1234\u1234\u1234" + (function() { return "\u1234"; })(); 48 externalizeString(realTwoByteExternalString); 49 assertFalse(isOneByteString(realTwoByteExternalString)); 50 51 assertTrue(isOneByteString(["a", twoByteExternalWithOneByteData].join(""))); 52 53 // Appending a two-byte string that contains only ascii chars should 54 // still produce an ascii cons. 55 var str1 = str + twoByteExternalWithOneByteData; 56 assertTrue(isOneByteString(str1)); 57 58 // Force flattening of the string. 59 var old_length = str1.length - twoByteExternalWithOneByteData.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(isOneByteString(str1)); 69 70 // Lower-casing an ascii string should produce ascii. 71 assertTrue(isOneByteString(str1.toLowerCase())); 72 73 assertFalse(isOneByteString(["a", realTwoByteExternalString].join(""))); 74 75 // Appending a real two-byte string should produce a two-byte cons. 76 var str2 = str + realTwoByteExternalString; 77 assertFalse(isOneByteString(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(isOneByteString(str2)); 90 } 91 92 // Run the test many times to ensure IC-s don't break things. 93 for (var i = 0; i < 10; i++) { 94 test(); 95 } 96 97 // Clean up string to make Valgrind happy. 98 gc(); 99 gc(); 100
