mmtk 0.16.0

MMTk is a framework for the design and implementation of high-performance and portable memory managers.
Documentation 
pub mod block;
pub mod defrag;
pub mod immixspace;
pub mod line;

pub use immixspace::*;

use crate::policy::immix::block::Block;
use crate::util::linear_scan::Region;

/// The max object size for immix: half of a block
pub const MAX_IMMIX_OBJECT_SIZE: usize = Block::BYTES >> 1;

/// Mark/sweep memory for block-level only
pub const BLOCK_ONLY: bool = false;

/// Opportunistic copying
pub const DEFRAG: bool = !cfg!(feature = "immix_no_defrag");

/// Mark lines when scanning objects.
/// Otherwise, do it at mark time.
pub const MARK_LINE_AT_SCAN_TIME: bool = true;

macro_rules! validate {
    ($x: expr) => { assert!($x, stringify!($x)) };
    ($x: expr => $y: expr) => { if $x { assert!($y, stringify!($x implies $y)) } };
}

fn validate_features() {
    // Block-only immix cannot do defragmentation
    validate!(DEFRAG => !BLOCK_ONLY);
    // Number of lines in a block should not exceed BlockState::MARK_MARKED
    assert!(Block::LINES / 2 <= u8::MAX as usize - 2);
}