Struct VMContext 

#[repr(C, align(16))]
pub struct VMContext {
    pub alloc_ptr: *mut u8,
    pub alloc_limit: *const u8,
    pub gc_trigger: unsafe extern "C" fn(*mut VMContext),
    pub tail_callee: *mut u8,
    pub tail_arg: *mut u8,
}

VM context passed as implicit first argument to all JIT-compiled functions.

Layout is frozen: gc_trigger reads fields by offset. alloc_ptr at 0, alloc_limit at 8, gc_trigger at 16, tail_callee at 24, tail_arg at 32.

Fields

alloc_ptr: *mut u8

Current bump-pointer allocation cursor.

alloc_limit: *const u8

End of the current nursery region.

gc_trigger: unsafe extern "C" fn(*mut VMContext)

Host function called when alloc_ptr exceeds alloc_limit.

tail_callee: *mut u8

TCO: pending tail-call callee (closure pointer), null if no pending tail call.

tail_arg: *mut u8

TCO: pending tail-call argument, null if no pending tail call.

Implementations

impl VMContext

pub fn new( nursery_start: *mut u8, nursery_end: *const u8, gc_trigger: unsafe extern "C" fn(*mut VMContext), ) -> Self

Create a new VMContext with the given nursery region and GC trigger.