From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 21:33:14 +0200 Subject: Adding upstream version 115.7.0esr. Signed-off-by: Daniel Baumann --- js/src/frontend/ValueUsage.h | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 js/src/frontend/ValueUsage.h (limited to 'js/src/frontend/ValueUsage.h') diff --git a/js/src/frontend/ValueUsage.h b/js/src/frontend/ValueUsage.h new file mode 100644 index 0000000000..562272c5f8 --- /dev/null +++ b/js/src/frontend/ValueUsage.h @@ -0,0 +1,30 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * vim: set ts=8 sts=2 et sw=2 tw=80: + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef frontend_ValueUsage_h +#define frontend_ValueUsage_h + +namespace js { +namespace frontend { + +// Used to control whether the expression result is used. This enables various +// optimizations, for example it allows to emit JSOp::CallIgnoresRv for function +// calls. +enum class ValueUsage { + // Assume the value of the current expression may be used. This is always + // correct but prohibits optimizations like JSOp::CallIgnoresRv. + WantValue, + + // Pass this when emitting an expression if the expression's value is + // definitely unused by later instructions. You must make sure the next + // instruction is JSOp::Pop, a jump to a JSOp::Pop, or something similar. + IgnoreValue +}; + +} /* namespace frontend */ +} /* namespace js */ + +#endif /* frontend_ValueUsage_h */ -- cgit v1.2.3