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// 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 --opt --noalways-opt
// Test that String.fromCodePoint() properly identifies zeros.
(function() {
function foo(x) {
return String.fromCodePoint(x);
}
%PrepareFunctionForOptimization(foo);
assertEquals("\u0000", foo(0));
assertEquals("\u0000", foo(-0));
%OptimizeFunctionOnNextCall(foo);
assertEquals("\u0000", foo(0));
assertEquals("\u0000", foo(-0));
assertOptimized(foo);
// Prepare foo to be re-optimized, ensuring it's bytecode / feedback vector
// doesn't get flushed after deoptimization.
%PrepareFunctionForOptimization(foo);
// Now passing anything outside the valid code point
// range should invalidate the optimized code.
assertThrows(_ => foo(-1));
assertUnoptimized(foo);
// And TurboFan should not inline the builtin anymore
// from now on (aka no deoptimization loop).
%OptimizeFunctionOnNextCall(foo);
assertEquals("\u0000", foo(0));
assertEquals("\u0000", foo(-0));
assertThrows(_ => foo(-1));
assertOptimized(foo);
})();
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