69e7ded547
With 32-bit kTaggedSize small strings may be not externalizable. Bug: v8:7703 Change-Id: I34002568214742dadb2358fca97dfb4b92a5342a Reviewed-on: https://chromium-review.googlesource.com/c/1480373 Reviewed-by: Toon Verwaest <verwaest@chromium.org> Commit-Queue: Igor Sheludko <ishell@chromium.org> Cr-Commit-Position: refs/heads/master@{#59770}
122 lines
5.1 KiB
JavaScript
122 lines
5.1 KiB
JavaScript
// Copyright 2010 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Flags: --expose-externalize-string --expose-gc
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// Test data pointer caching of external strings.
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function test() {
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// Test string.charAt.
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var charat_str = new Array(5);
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charat_str[0] = "0123456789ABCDEF0123456789ABCDEF\
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0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF\
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0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF\
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0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF\
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0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF";
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charat_str[1] = "0123456789ABCDEF";
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for (var i = 0; i < 6; i++) charat_str[1] += charat_str[1];
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try { // String can only be externalized once
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externalizeString(charat_str[0], false);
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externalizeString(charat_str[1], true);
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} catch (ex) { }
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charat_str[2] = charat_str[0].slice(0, -1);
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charat_str[3] = charat_str[1].slice(0, -1);
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charat_str[4] = charat_str[0] + charat_str[0];
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for (var i = 0; i < 5; i++) {
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assertEquals('B', charat_str[i].charAt(6*16 + 11));
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assertEquals('C', charat_str[i].charAt(6*16 + 12));
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assertEquals('A', charat_str[i].charAt(3*16 + 10));
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assertEquals('B', charat_str[i].charAt(3*16 + 11));
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}
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charat_short = "01234";
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try { // String can only be externalized once
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externalizeString(charat_short, true);
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} catch (ex) { }
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assertEquals("1", charat_short.charAt(1));
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// Test regexp and short substring.
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var re = /(A|B)/;
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var rere = /(T.{1,2}B)/;
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var ascii = "ABCDEFGHIJKLMNOPQRST";
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var twobyte = "_ABCDEFGHIJKLMNOPQRST";
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try {
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externalizeString(ascii, false);
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externalizeString(twobyte, true);
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} catch (ex) { }
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assertTrue(isOneByteString(ascii));
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assertFalse(isOneByteString(twobyte));
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var ascii_slice = ascii.slice(1,-1);
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var twobyte_slice = twobyte.slice(2,-1);
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var ascii_cons = ascii + ascii;
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var twobyte_cons = twobyte + twobyte;
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for (var i = 0; i < 2; i++) {
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assertEquals(["A", "A"], re.exec(ascii));
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assertEquals(["B", "B"], re.exec(ascii_slice));
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assertEquals(["TAB", "TAB"], rere.exec(ascii_cons));
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assertEquals(["A", "A"], re.exec(twobyte));
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assertEquals(["B", "B"], re.exec(twobyte_slice));
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assertEquals(["T_AB", "T_AB"], rere.exec(twobyte_cons));
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assertEquals("DEFG", ascii_slice.substr(2, 4));
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assertEquals("DEFG", twobyte_slice.substr(2, 4));
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assertEquals("DEFG", ascii_cons.substr(3, 4));
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assertEquals("DEFG", twobyte_cons.substr(4, 4));
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}
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// Test adding external strings
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var short_ascii = "E=";
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var long_ascii = "MCsquared";
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var short_twobyte = "E\u1234";
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var long_twobyte = "MCsquare\u1234";
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try { // String can only be externalized once
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externalizeString(short_ascii, false);
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externalizeString(long_ascii, false);
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externalizeString(short_twobyte, true);
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externalizeString(long_twobyte, true);
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assertTrue(isOneByteString(short_asii) && isOneByteString(long_ascii));
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assertFalse(isOneByteString(short_twobyte) || isOneByteString(long_twobyte));
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} catch (ex) { }
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assertEquals("E=MCsquared", short_ascii + long_ascii);
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assertTrue(isOneByteString(short_ascii + long_ascii));
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assertEquals("MCsquaredE=", long_ascii + short_ascii);
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assertEquals("E\u1234MCsquare\u1234", short_twobyte + long_twobyte);
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assertFalse(isOneByteString(short_twobyte + long_twobyte));
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assertEquals("E=MCsquared", "E=" + long_ascii);
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assertEquals("E\u1234MCsquared", short_twobyte + "MCsquared");
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assertEquals("E\u1234MCsquared", short_twobyte + long_ascii);
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assertFalse(isOneByteString(short_twobyte + long_ascii));
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}
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// Run the test many times to ensure IC-s don't break things.
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for (var i = 0; i < 10; i++) {
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test();
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}
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// Clean up string to make Valgrind happy.
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gc();
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gc();
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