4e6aa9767a
This CL fixes the behaviour of String.prototype.startsWith when undefined is passed as the search term. It also implements a small shorthand when the search term is empty (according to the spec). Bug: v8:11977 Change-Id: Iec2aa5f4301fcf444f20d5c1a80d3f634624d6f3 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3035089 Commit-Queue: Maya Lekova <mslekova@chromium.org> Commit-Queue: Georg Neis <neis@chromium.org> Auto-Submit: Maya Lekova <mslekova@chromium.org> Reviewed-by: Georg Neis <neis@chromium.org> Cr-Commit-Position: refs/heads/master@{#75763}
95 lines
2.3 KiB
JavaScript
95 lines
2.3 KiB
JavaScript
// Copyright 2019 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 --opt
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(function() {
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function foo(string) { return string.startsWith('a'); }
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%PrepareFunctionForOptimization(foo);
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assertEquals(false, foo(''));
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assertEquals(true, foo('a'));
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assertEquals(false, foo('ba'));
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assertEquals(true, foo('abc'));
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%OptimizeFunctionOnNextCall(foo);
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assertEquals(false, foo(''));
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assertEquals(true, foo('a'));
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assertEquals(false, foo('ba'));
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assertEquals(true, foo('abc'));
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assertOptimized(foo);
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})();
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(function() {
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function f() { return "abc".startsWith(); }
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%PrepareFunctionForOptimization(f);
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assertEquals(false, f());
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assertEquals(false, f());
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%OptimizeFunctionOnNextCall(f);
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assertEquals(false, f());
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assertOptimized(f);
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})();
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(function() {
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function g(n) { return "abc".startsWith("a", n); }
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%PrepareFunctionForOptimization(g);
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assertEquals(true, g(-1));
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assertEquals(true, g(0));
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assertEquals(false, g(1));
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assertEquals(false, g(2));
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assertEquals(false, g(3));
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assertEquals(false, g(4));
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%OptimizeFunctionOnNextCall(g);
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assertEquals(true, g(-1));
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assertEquals(true, g(0));
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assertEquals(false, g(1));
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assertEquals(false, g(2));
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assertEquals(false, g(3));
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assertEquals(false, g(4));
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assertOptimized(g);
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})();
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(function() {
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function g(n) { return "cba".startsWith("a", n); }
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%PrepareFunctionForOptimization(g);
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assertEquals(false, g(-1));
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assertEquals(false, g(0));
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assertEquals(false, g(1));
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assertEquals(true, g(2));
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assertEquals(false, g(3));
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assertEquals(false, g(4));
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%OptimizeFunctionOnNextCall(g);
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assertEquals(false, g(-1));
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assertEquals(false, g(0));
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assertEquals(false, g(1));
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assertEquals(true, g(2));
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assertEquals(false, g(3));
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assertEquals(false, g(4));
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assertOptimized(g);
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})();
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(function() {
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function f(n) { return "cba".startsWith("a", n); }
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%PrepareFunctionForOptimization(f);
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f();
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f();
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%OptimizeFunctionOnNextCall(f);
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assertEquals(false, f(1073741824));
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})();
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(function() {
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function f(str) {
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return str.startsWith('');
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}
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%PrepareFunctionForOptimization(f);
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f('foo');
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f('');
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%OptimizeFunctionOnNextCall(f);
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assertEquals(f('foo'), true);
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assertEquals(f(''), true);
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})();
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