// 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 // Case One: the template is already initialized before compilation. let saved_array; function tagged_function(a) { saved_array = a; return "something"; } function foo(b) { let a = tagged_function`hello ${b}`; return a + " " + b; } %PrepareFunctionForOptimization(foo); foo(); foo(); %OptimizeFunctionOnNextCall(foo); foo(); // Case Two: the template hasn't been initialized at the point we // do optimized compile. function bar(b) { if (b) { let a = tagged_function`initialized late ${b}`; b = a; } return b; } %PrepareFunctionForOptimization(bar); bar(); bar(); %OptimizeFunctionOnNextCall(bar); bar(true); let saved_array_from_optimized_call = saved_array; // Finally, ensure that if the function is deoptimized, the tagged-template // code still runs. This is useful to test because TurboFan doesn't cache // the tagged template in the feedback vector if it has to create it. %DeoptimizeFunction(bar); bar(true); // Furthermore, we want to ensure that the JSArray passed to the function // is the same. assertSame(saved_array_from_optimized_call, saved_array);