Struct Region 

pub struct Region { /* private fields */ }

A contiguous 2MB memory region allocated via mmap.

Objects are bump-allocated within the region. Each object is preceded by a GcHeader (8 bytes) and is 8-byte aligned.

Implementations

impl Region

pub fn new() -> Self

Allocate a new 2MB region via mmap.

pub fn try_alloc(&mut self, layout: Layout) -> Option<*mut u8>

Try to bump-allocate within this region.

Returns a pointer to the object data (after the GcHeader) or None if the region is exhausted.

total_size includes the GcHeader (8 bytes) + the object layout size, already aligned to 8 bytes.

pub fn contains(&self, ptr: *const u8) -> bool

Check if a pointer falls within this region.

pub fn base(&self) -> *mut u8

Get the base address of this region.

pub fn used_bytes(&self) -> usize

Get the current used bytes.

pub fn remaining(&self) -> usize

Get the remaining capacity.

pub fn set_cursor(&mut self, cursor: usize)

Set the cursor to a specific offset. Used by TLAB flush to sync the TLAB’s allocation cursor back into the region before sweep.

pub fn reset(&mut self)

Reset the cursor (after relocation has moved all live objects out).

pub fn for_each_object(&self, f: impl FnMut(&GcHeader, *mut u8))

Iterate over all allocated objects in this region.

Calls f(header, obj_ptr) for each object.

pub fn for_each_object_mut(&mut self, f: impl FnMut(&mut GcHeader, *mut u8))

Iterate over all allocated objects mutably.

pub fn protect(&self)

Protect this region’s pages (PROT_NONE) — used after relocation.

pub fn unprotect(&self)

Unprotect this region’s pages (PROT_READ|PROT_WRITE) — used after fixup.

pub fn live_bytes(&self) -> usize

Get/set live_bytes tracking.

pub fn set_live_bytes(&mut self, bytes: usize)

Trait Implementations

impl Drop for Region

fn drop(&mut self)

Executes the destructor for this type.

impl Send for Region