JezK
Edit File: string-external-cached.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 // Test data pointer caching of external strings. function test() { // Test string.charAt. var charat_str = new Array(5); charat_str[0] = "0123456789ABCDEF0123456789ABCDEF\ 0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF\ 0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF\ 0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF\ 0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF"; charat_str[1] = "0123456789ABCDEF"; for (var i = 0; i < 6; i++) charat_str[1] += charat_str[1]; try { // String can only be externalized once externalizeString(charat_str[0], false); externalizeString(charat_str[1], true); } catch (ex) { } charat_str[2] = charat_str[0].slice(0, -1); charat_str[3] = charat_str[1].slice(0, -1); charat_str[4] = charat_str[0] + charat_str[0]; for (var i = 0; i < 5; i++) { assertEquals('B', charat_str[i].charAt(6*16 + 11)); assertEquals('C', charat_str[i].charAt(6*16 + 12)); assertEquals('A', charat_str[i].charAt(3*16 + 10)); assertEquals('B', charat_str[i].charAt(3*16 + 11)); } charat_short = "012"; try { // String can only be externalized once externalizeString(charat_short, true); } catch (ex) { } assertEquals("1", charat_short.charAt(1)); // Test regexp and short substring. var re = /(A|B)/; var rere = /(T.{1,2}B)/; var ascii = "ABCDEFGHIJKLMNOPQRST"; var twobyte = "_ABCDEFGHIJKLMNOPQRST"; try { externalizeString(ascii, false); externalizeString(twobyte, true); } catch (ex) { } assertTrue(isAsciiString(ascii)); assertFalse(isAsciiString(twobyte)); var ascii_slice = ascii.slice(1,-1); var twobyte_slice = twobyte.slice(2,-1); var ascii_cons = ascii + ascii; var twobyte_cons = twobyte + twobyte; for (var i = 0; i < 2; i++) { assertEquals(["A", "A"], re.exec(ascii)); assertEquals(["B", "B"], re.exec(ascii_slice)); assertEquals(["TAB", "TAB"], rere.exec(ascii_cons)); assertEquals(["A", "A"], re.exec(twobyte)); assertEquals(["B", "B"], re.exec(twobyte_slice)); assertEquals(["T_AB", "T_AB"], rere.exec(twobyte_cons)); assertEquals("DEFG", ascii_slice.substr(2, 4)); assertEquals("DEFG", twobyte_slice.substr(2, 4)); assertEquals("DEFG", ascii_cons.substr(3, 4)); assertEquals("DEFG", twobyte_cons.substr(4, 4)); } // Test adding external strings var short_ascii = "E="; var long_ascii = "MCsquared"; var short_twobyte = "E\u1234"; var long_twobyte = "MCsquare\u1234"; try { // String can only be externalized once externalizeString(short_ascii, false); externalizeString(long_ascii, false); externalizeString(short_twobyte, true); externalizeString(long_twobyte, true); assertTrue(isAsciiString(short_asii) && isAsciiString(long_ascii)); assertFalse(isAsciiString(short_twobyte) || isAsciiString(long_twobyte)); } catch (ex) { } assertEquals("E=MCsquared", short_ascii + long_ascii); assertTrue(isAsciiString(short_ascii + long_ascii)); assertEquals("MCsquaredE=", long_ascii + short_ascii); assertEquals("E\u1234MCsquare\u1234", short_twobyte + long_twobyte); assertFalse(isAsciiString(short_twobyte + long_twobyte)); assertEquals("E=MCsquared", "E=" + long_ascii); assertEquals("E\u1234MCsquared", short_twobyte + "MCsquared"); assertEquals("E\u1234MCsquared", short_twobyte + long_ascii); assertFalse(isAsciiString(short_twobyte + long_ascii)); } // 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();