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mem: add reset() for NockStack

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This commit is contained in:
Jonathan Paprocki 2023-10-13 10:57:42 -04:00
parent 1f4113da48
commit 6c82f61edc
1 changed files with 13 additions and 0 deletions
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13
rust/ares/src/mem.rs
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@ -88,6 +88,19 @@ impl NockStack {
}
}
/** Resets the NockStack. */
pub fn reset(&mut self, top_slots: usize) {
self.frame_pointer = unsafe { self.start.add(RESERVED + top_slots) } as *mut u64;
self.stack_pointer = self.frame_pointer;
self.alloc_pointer = unsafe { self.start.add(self.size) } as *mut u64;
self.pc = false;
unsafe {
*self.frame_pointer.sub(FRAME + 1) = ptr::null::<u64>() as u64; // "frame pointer" from "previous" frame
*self.frame_pointer.sub(STACK + 1) = ptr::null::<u64>() as u64; // "stack pointer" from "previous" frame
*self.frame_pointer.sub(ALLOC + 1) = ptr::null::<u64>() as u64; // "alloc pointer" from "previous" frame
};
}
/** Current frame pointer of this NockStack */
pub fn get_frame_pointer(&self) -> *const u64 {
self.frame_pointer