38 lines
1.6 KiB
JavaScript
38 lines
1.6 KiB
JavaScript
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// Copyright 2020 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: --allow-natives-syntax
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// Flags: --no-enable-experimental-regexp-engine
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// Flags: --enable-experimental-regexp-engine-on-excessive-backtracks
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// Flags: --regexp-tier-up --regexp-tier-up-ticks 1
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// We should report accurate results on patterns for which irregexp suffers
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// from catastrophic backtracking.
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let regexp = new RegExp("a+".repeat(100) + "x");
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let match = "a".repeat(100) + "x";
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let subject = match.repeat(3);
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// First for the irregexp interpreter:
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assertArrayEquals([match], regexp.exec(subject));
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// Now for native irregexp:
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assertArrayEquals([match], regexp.exec(subject));
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// Now the same again with String.replace and a replacement function to
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// exercise the RegExpGlobalCache.
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regexp = new RegExp(regexp.source, "g");
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assertEquals("", subject.replace(regexp, function () { return ""; }));
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assertEquals("", subject.replace(regexp, function () { return ""; }));
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// If an explicit backtrack limit is larger than the default, then we should
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// take the default limit.
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regexp = %NewRegExpWithBacktrackLimit(regexp.source, "", 1000000000)
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assertArrayEquals([match], regexp.exec(subject));
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assertArrayEquals([match], regexp.exec(subject));
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// If the experimental engine can't handle a regexp with an explicit backtrack
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// limit, we should abort and return null on excessive backtracking.
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regexp = %NewRegExpWithBacktrackLimit(regexp.source + "(?=a)", "", 100)
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assertEquals(null, regexp.exec(subject));
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assertEquals(null, regexp.exec(subject));
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