f1e0b83e7bPR-URL: https://github.com/nodejs/node/pull/61898 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Filip Skokan <panva.ip@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
41 lines
1.3 KiB
JavaScript
41 lines
1.3 KiB
JavaScript
// Copyright 2025 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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//
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// Flags: --allow-natives-syntax --maglev --no-turbofan
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function do_slice(str, start, end) {
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return str.slice(start, end);
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}
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const s = "abcdefg";
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%PrepareFunctionForOptimization(do_slice);
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// Warmup to collect type feedback
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for (let i = 0; i < 10; i++) {
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assertEquals(s, do_slice(s, 0, s.length));
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assertEquals("bc", do_slice(s, 1, 3));
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}
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%OptimizeMaglevOnNextCall(do_slice);
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// Test optimized code.
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assertEquals(s, do_slice(s, 0, s.length));
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assertEquals("bc", do_slice(s, 1, 3));
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// Edge cases.
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assertEquals("fg", do_slice(s, -2, s.length)); // start < 0
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assertEquals("f", do_slice(s, -2, -1)); // start < 0, end < 0
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assertEquals("", do_slice(s, 5, 2)); // end <= start
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assertEquals(s, do_slice(s, 0, 100)); // clamp end
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assertEquals("ab", do_slice(s, -100, 2)); // clamp start
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assertEquals( "", do_slice(s, -1, 0)); // empty
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// Test with different string.
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const s2 = "12345";
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assertEquals("234", do_slice(s2, 1, 4));
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// We should still be in optimized code.
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assertTrue(isMaglevved(do_slice));
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// Passing something else than a string deopts.
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assertEquals("x", do_slice({slice: function() { return "x";}}));
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assertFalse(isMaglevved(do_slice));
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