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7160366b8c
MozReview-Commit-ID: Grf1bKIx2iT --HG-- extra : rebase_source : 8013a66263a3a014944b0815ff9bc7d8ac0ad9a3
24 lines
927 B
Rust
24 lines
927 B
Rust
// Copyright 2015 The Servo Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// FIXME(rust-lang/rust#18153): generate these from an enum
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pub const DYNAMIC_TAG: u8 = 0b_00;
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pub const INLINE_TAG: u8 = 0b_01; // len in upper nybble
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pub const STATIC_TAG: u8 = 0b_10;
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pub const TAG_MASK: u64 = 0b_11;
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pub const ENTRY_ALIGNMENT: usize = 4; // Multiples have TAG_MASK bits unset, available for tagging.
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pub const MAX_INLINE_LEN: usize = 7;
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pub const STATIC_SHIFT_BITS: usize = 32;
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pub fn pack_static(n: u32) -> u64 {
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(STATIC_TAG as u64) | ((n as u64) << STATIC_SHIFT_BITS)
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}
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