mmtk 0.3.2

MMTk is a framework for the design and implementation of high-performance and portable memory managers.
Documentation 
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//! Plan: generational copying

pub(super) mod gc_work;
pub(super) mod global;
pub(super) mod mutator;

pub use self::global::GenCopy;
use super::barriers::BarrierSelector;

/// # Barrier overhead measurement:
///  - Set `FULL_NURSERY_GC` to `true`.
/// ## 1. Baseline: No barrier
///  - Set `ACTIVE_BARRIER` to `BarrierSelector::NoBarrier`.
/// ## 2. Object barrier
///  - Set `ACTIVE_BARRIER` to `BarrierSelector::ObjectBarrier`.
pub const ACTIVE_BARRIER: BarrierSelector = BarrierSelector::ObjectBarrier;
/// Full heap collection as nursery GC.
pub const FULL_NURSERY_GC: bool = false;
/// Force object barrier never enters the slow-path.
/// If enabled,
///  - `FULL_NURSERY_GC` must be `true`.
///  - `ACTIVE_BARRIER` must be `ObjectBarrier`.
pub const NO_SLOW: bool = false;

pub use self::global::GENCOPY_CONSTRAINTS;

#[cfg(feature = "side_gc_header")]
use crate::util::gc_byte;
use crate::util::side_metadata::*;

const LOGGING_META: SideMetadataSpec = SideMetadataSpec {
    scope: SideMetadataScope::Global,
    #[cfg(not(feature = "side_gc_header"))]
    offset: GLOBAL_SIDE_METADATA_BASE_ADDRESS.as_usize(),
    #[cfg(feature = "side_gc_header")]
    offset: GLOBAL_SIDE_METADATA_BASE_ADDRESS.as_usize()
        + metadata_address_range_size(gc_byte::SIDE_GC_BYTE_SPEC),
    log_num_of_bits: 0,
    log_min_obj_size: 3,
};