Delete old heap allocator

src/memory/heap_allocator.rs

@@ -1,66 +0,0 @@
-use alloc::heap::{Alloc, AllocErr, Layout};
-
-use core::sync::atomic::{AtomicUsize, Ordering};
-
-/// A simple allocator that allocates memory linearly and ignores freed memory.
-#[derive(Debug)]
-pub struct BumpAllocator {
-    heap_start: usize,
-    heap_end: usize,
-    next: AtomicUsize,
-}
-
-impl BumpAllocator {
-    pub const fn new(heap_start: usize, heap_end: usize) -> Self {
-        Self { heap_start, heap_end, next: AtomicUsize::new(heap_start) }
-    }
-}
-
-unsafe impl<'a> Alloc for &'a BumpAllocator {
-    unsafe fn alloc(&mut self, layout: Layout) -> Result<*mut u8, AllocErr> {
-        loop {
-            // load current state of the `next` field
-            let current_next = self.next.load(Ordering::Relaxed);
-            let alloc_start = align_up(current_next, layout.align());
-            let alloc_end = alloc_start.saturating_add(layout.size());
-
-            if alloc_end <= self.heap_end {
-                // update the `next` pointer if it still has the value `current_next`
-                let next_now = self.next.compare_and_swap(current_next, alloc_end,
-                    Ordering::Relaxed);
-                if next_now == current_next {
-                    // next address was successfully updated, allocation succeeded
-                    return Ok(alloc_start as *mut u8);
-                }
-            } else {
-                return Err(AllocErr::Exhausted{ request: layout })
-            }
-        }
-    }
-
-    unsafe fn dealloc(&mut self, ptr: *mut u8, layout: Layout) {
-        // do nothing, leak memory
-    }
-
-    fn oom(&mut self, _: AllocErr) -> ! {
-        panic!("Out of memory");
-    }
-}
-
-/// Align downwards. Returns the greatest x with alignment `align`
-/// so that x <= addr. The alignment must be a power of 2.
-pub fn align_down(addr: usize, align: usize) -> usize {
-    if align.is_power_of_two() {
-        addr & !(align - 1)
-    } else if align == 0 {
-        addr
-    } else {
-        panic!("`align` must be a power of 2");
-    }
-}
-
-/// Align upwards. Returns the smallest x with alignment `align`
-/// so that x >= addr. The alignment must be a power of 2.
-pub fn align_up(addr: usize, align: usize) -> usize {
-    align_down(addr + align - 1, align)
-}