| // Copyright 2018 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 | |
| function foo(a) { | |
| a = "" + Math.abs(a); | |
| return a.charCodeAt(0); | |
| } | |
| // Add '1' to the number to string table (as SeqString). | |
| %PrepareFunctionForOptimization(foo); | |
| String.fromCharCode(49); | |
| // Turn the SeqString into a ThinString via forced internalization. | |
| const o = {}; | |
| o[1..toString()] = 1; | |
| assertEquals(49, foo(1)); | |
| assertEquals(49, foo(1)); | |
| %OptimizeFunctionOnNextCall(foo); | |
| assertEquals(49, foo(1)); |