mmtk 0.33.0

MMTk is a framework for the design and implementation of high-performance and portable memory managers.
Documentation 
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//! This module provides an implementation of side table metadata.
// For convenience, this module is public and the bindings may create and use side metadata for their purpose.

pub(crate) mod helpers;
#[cfg(target_pointer_width = "32")]
mod helpers_32;
mod layout;

mod global;
pub(crate) mod ranges;
mod sanity;
mod side_metadata_tests;
pub(crate) mod spec_defs;

pub use global::*;
pub use layout::*;

use crate::util::options::Options;
use crate::vm::ObjectModel;
use crate::vm::VMBinding;

/// Initialize side metadata runtime state and reserve the side metadata address range.
pub fn initialize_side_metadata<VM: VMBinding>(options: &Options) {
    let vm_side_metadata_specs = super::extract_side_metadata(&[
        *VM::VMObjectModel::GLOBAL_LOG_BIT_SPEC,
        *VM::VMObjectModel::LOCAL_FORWARDING_POINTER_SPEC,
        *VM::VMObjectModel::LOCAL_FORWARDING_BITS_SPEC,
        *VM::VMObjectModel::LOCAL_MARK_BIT_SPEC,
        #[cfg(feature = "object_pinning")]
        *VM::VMObjectModel::LOCAL_PINNING_BIT_SPEC,
        *VM::VMObjectModel::LOCAL_LOS_MARK_NURSERY_SPEC,
    ]);
    debug!(
        "initialize_side_metadata(): collected {} VM side metadata specs",
        vm_side_metadata_specs.len()
    );
    for spec in &vm_side_metadata_specs {
        debug!("  VM side metadata spec: {:?}", spec);
    }
    set_vm_side_metadata_specs(&vm_side_metadata_specs);
    initialize_side_metadata_base(
        *options.side_metadata_base_address,
        options.transparent_hugepages_as_huge_page_support(),
    );
}

#[cfg(test)]
pub(crate) fn core_test_initialize_side_metadata() {
    use crate::util::os::HugePageSupport;
    use crate::util::Address;

    if is_side_metadata_initialized() {
        return;
    }

    set_vm_side_metadata_specs(&[]);
    initialize_side_metadata_base(Address::ZERO, HugePageSupport::No);
}

// Re-export helper functions. Allow unused imports in case there is no function that can be re-exported.
#[allow(unused_imports)]
pub(crate) use helpers::*;
#[cfg(target_pointer_width = "32")]
#[allow(unused_imports)]
pub(crate) use helpers_32::*;
pub(crate) use sanity::SideMetadataSanity;