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Edit File: string-externalize.js
// Copyright 2010 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: --expose-externalize-string --expose-gc var size = 1024; function test() { var str = ""; // Build an ascii cons string. for (var i = 0; i < size; i++) { str += String.fromCharCode(i & 0x7f); } assertTrue(isAsciiString(str)); var twoByteExternalWithAsciiData = "AA" + (function() { return "A"; })(); externalizeString(twoByteExternalWithAsciiData, true /* force two-byte */); assertFalse(isAsciiString(twoByteExternalWithAsciiData)); var realTwoByteExternalString = "\u1234\u1234\u1234\u1234" + (function() { return "\u1234"; })(); externalizeString(realTwoByteExternalString); assertFalse(isAsciiString(realTwoByteExternalString)); assertTrue(isAsciiString(["a", twoByteExternalWithAsciiData].join(""))); // Appending a two-byte string that contains only ascii chars should // still produce an ascii cons. var str1 = str + twoByteExternalWithAsciiData; assertTrue(isAsciiString(str1)); // Force flattening of the string. var old_length = str1.length - twoByteExternalWithAsciiData.length; for (var i = 0; i < old_length; i++) { assertEquals(String.fromCharCode(i & 0x7f), str1[i]); } for (var i = old_length; i < str1.length; i++) { assertEquals("A", str1[i]); } // Flattened string should still be ascii. assertTrue(isAsciiString(str1)); // Lower-casing an ascii string should produce ascii. assertTrue(isAsciiString(str1.toLowerCase())); assertFalse(isAsciiString(["a", realTwoByteExternalString].join(""))); // Appending a real two-byte string should produce a two-byte cons. var str2 = str + realTwoByteExternalString; assertFalse(isAsciiString(str2)); // Force flattening of the string. old_length = str2.length - realTwoByteExternalString.length; for (var i = 0; i < old_length; i++) { assertEquals(String.fromCharCode(i & 0x7f), str2[i]); } for (var i = old_length; i < str.length; i++) { assertEquals("\u1234", str2[i]); } // Flattened string should still be two-byte. assertFalse(isAsciiString(str2)); } // Run the test many times to ensure IC-s don't break things. for (var i = 0; i < 10; i++) { test(); } // Clean up string to make Valgrind happy. gc(); gc();