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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /js/src/frontend/ValueUsage.h | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'js/src/frontend/ValueUsage.h')
-rw-r--r-- | js/src/frontend/ValueUsage.h | 30 |
1 files changed, 30 insertions, 0 deletions
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 */ |