check-bounds-string-from-char-code-at.js 666 Bytes
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// 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 --no-always-opt
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// Flags: --no-stress-flush-bytecode
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let string = "foobar";

function f(useArrayIndex) {
  let index = useArrayIndex ? '1': '4294967296';
  return string.charCodeAt(index);
}

%PrepareFunctionForOptimization(f);
f(true);
f(true);

%OptimizeFunctionOnNextCall(f);
f(false);
assertUnoptimized(f);

%PrepareFunctionForOptimization(f);
f(true);
f(true);

%OptimizeFunctionOnNextCall(f);
f(true);

// no deopt here
f(false);
assertOptimized(f);