// Copyright 2019 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. // Flags: --allow-natives-syntax --opt (function() { function foo(string) { return string.startsWith('a'); } %PrepareFunctionForOptimization(foo); assertEquals(false, foo('')); assertEquals(true, foo('a')); assertEquals(false, foo('ba')); assertEquals(true, foo('abc')); %OptimizeFunctionOnNextCall(foo); assertEquals(false, foo('')); assertEquals(true, foo('a')); assertEquals(false, foo('ba')); assertEquals(true, foo('abc')); assertOptimized(foo); })(); (function() { function f() { return "abc".startsWith(); } %PrepareFunctionForOptimization(f); assertEquals(false, f()); assertEquals(false, f()); %OptimizeFunctionOnNextCall(f); assertEquals(false, f()); assertOptimized(f); })(); (function() { function g(n) { return "abc".startsWith("a", n); } %PrepareFunctionForOptimization(g); assertEquals(true, g(-1)); assertEquals(true, g(0)); assertEquals(false, g(1)); assertEquals(false, g(2)); assertEquals(false, g(3)); assertEquals(false, g(4)); %OptimizeFunctionOnNextCall(g); assertEquals(true, g(-1)); assertEquals(true, g(0)); assertEquals(false, g(1)); assertEquals(false, g(2)); assertEquals(false, g(3)); assertEquals(false, g(4)); assertOptimized(g); })(); (function() { function g(n) { return "cba".startsWith("a", n); } %PrepareFunctionForOptimization(g); assertEquals(false, g(-1)); assertEquals(false, g(0)); assertEquals(false, g(1)); assertEquals(true, g(2)); assertEquals(false, g(3)); assertEquals(false, g(4)); %OptimizeFunctionOnNextCall(g); assertEquals(false, g(-1)); assertEquals(false, g(0)); assertEquals(false, g(1)); assertEquals(true, g(2)); assertEquals(false, g(3)); assertEquals(false, g(4)); assertOptimized(g); })(); (function() { function f(n) { return "cba".startsWith("a", n); } %PrepareFunctionForOptimization(f); f(); f(); %OptimizeFunctionOnNextCall(f); assertEquals(false, f(1073741824)); })();