9d7cd9b864
PR-URL: https://github.com/nodejs/node/pull/54077 Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Richard Lau <rlau@redhat.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
50 lines
1.5 KiB
JavaScript
50 lines
1.5 KiB
JavaScript
// Copyright 2024 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --expose-externalize-string --allow-natives-syntax
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function Constant() {
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return String.fromCharCode(0x100_000);
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}
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const kCode = 0x100_000;
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function NonConstant(x) {
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return String.fromCharCode(x);
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}
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function Shenanigans(string_maker) {
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let array = new Array(1000);
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array[1000] = string_maker();
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let long = array.join("abc");
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let slice = long.substring(0, 1000);
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// Internalize {long}. The first time this is executed, the string will
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// be internalized in-place; from the second time onwards it'll be turned
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// into a ThinString.
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let dummy = {};
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dummy[long] = "internalized!";
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let test = slice.replace(/abc/uim, ()=>{});
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assertEquals("undefined", test.substring(0, 9));
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}
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%PrepareFunctionForOptimization(Constant);
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%PrepareFunctionForOptimization(NonConstant);
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for (let i = 0; i < 3; i++) {
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assertTrue(isOneByteString(Constant()));
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assertTrue(isOneByteString(NonConstant(kCode)));
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Shenanigans(Constant);
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Shenanigans(NonConstant);
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}
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%OptimizeFunctionOnNextCall(Constant);
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%OptimizeFunctionOnNextCall(NonConstant);
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// Part I: If we get a two-byte string, and use it for further shenanigans,
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// that shouldn't trip up any DCHECKs.
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Shenanigans(Constant);
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Shenanigans(NonConstant);
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// Part II: We shouldn't be getting two-byte strings.
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assertTrue(isOneByteString(Constant()));
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assertTrue(isOneByteString(NonConstant(kCode)));
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