Module alloc 

A bump allocator with an explicit reset.

Programs that need alloc on a freestanding target need a #[global_allocator], and a bump arena is the cheapest thing that works: allocation is a pointer add, and a program that runs once and exits never needs to free.

BumpAlloc::reset is what makes the arena re-usable. Without it a program is single-shot per instance — the second invocation walks off the end of the arena and the allocation fails, which surfaces as a guest panic rather than anything legible. That matters for any caller that invokes the same instance twice, benchmark harnesses very much included: measuring steady-state execution means running the same instance repeatedly.

Resetting is not free of consequences: it invalidates every live allocation at once. It is only sound at a point where nothing from the previous invocation is still borrowed — i.e. at an entry point, before any work begins. bump_allocator! generates a reset_heap() for exactly that use.

Structs

BumpAlloc

A fixed-size bump arena of N bytes.