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