Function show_heap_prealloc

alloc-stdlib/src/bin/example.rs:31–55

()

declare_stack_allocator_struct!(StackAllocatedFreelist16, 16, stack);

fn show_heap_prealloc() {
  let mut zero_global_buffer = define_allocator_memory_pool!(4, u8, [0; 1024 * 1024 * 20], heap);

  let mut boxallocator = HeapPrealloc::<u8>::new_allocator(1024 * 1024, &mut zero_global_buffer, bzero);

  {
    let mut x = boxallocator.alloc_cell(9999);
    x.slice_mut()[0] = 3;
    let mut y = boxallocator.alloc_cell(4);
    y[0] = 5;
    boxallocator.free_cell(y);

    let mut three = boxallocator.alloc_cell(3);
    three[0] = 6;
    boxallocator.free_cell(three);

    let mut z = boxallocator.alloc_cell(4);
    z.slice_mut()[1] = 8;
    let mut reget_three = boxallocator.alloc_cell(4);
    reget_three.slice_mut()[1] = 9;
    //y.mem[0] = 6; // <-- this is an error (use after free)
    println!("x[0] = {:?} z[0] = {:?}  z[1] = {:?} r3[0] = {:?} r3[1] = {:?}", x.mem[0], z.mem[0], z.mem[1], reget_three[0], reget_three.slice()[1]);
    let mut _z = boxallocator.alloc_cell(1);
  }
}

fn main() {
  let mut global_buffer = unsafe {define_allocator_memory_pool!(4, u8, [0; 1024 * 1024 * 200], calloc)};