2ab2ec2243
The TurboFan backends currently don't support tail-calls to CPP builtins because the semantics of kJavaScriptCallArgCountRegister has different semantics for stub call descriptors versus JavaScript call descriptors. This is actually a short-coming of the backends and follow-up work will make the backends more robust in that regard to fail hard on unsupported constructs like that. This just disables the lowering creating such a tail-call. R=bmeurer@chromium.org BUG=chromium:658691 TEST=mjsunit/regress/regress-crbug-658691 Review-Url: https://codereview.chromium.org/2447383002 Cr-Commit-Position: refs/heads/master@{#40590}
25 lines
765 B
JavaScript
25 lines
765 B
JavaScript
// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --allow-natives-syntax --harmony-tailcalls --ignition --turbo
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// The {f} function is compiled using TurboFan.
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// 1) The call to {Reflect.set} has no arguments adaptation.
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// 2) The call to {Reflect.set} is in tail position.
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function f(a, b, c) {
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"use strict";
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return Reflect.set({});
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}
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// The {g} function is compiled using Ignition.
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// 1) The call to {f} requires arguments adaptation.
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// 2) The call to {f} is not in tail position.
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function g() {
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return f() + "-no-tail";
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}
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assertEquals("true-no-tail", g());
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%OptimizeFunctionOnNextCall(f);
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assertEquals("true-no-tail", g());
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