libfringe/src/slice_stack.rs

26 lines
886 B
Rust
Raw Normal View History

2016-08-19 21:58:45 +08:00
// This file is part of libfringe, a low-level green threading library.
// Copyright (c) whitequark <whitequark@whitequark.org>
// See the LICENSE file included in this distribution.
/// SliceStack holds a non-guarded stack allocated elsewhere and provided as a mutable slice.
///
/// Any slice used in a SliceStack must adhere to the [Stack contract][contract].
/// [contract]: trait.Stack.html
#[derive(Debug)]
2016-08-19 21:58:45 +08:00
pub struct SliceStack<'a>(pub &'a mut [u8]);
impl<'a> ::stack::Stack for SliceStack<'a> {
#[inline(always)]
fn base(&self) -> *mut u8 {
// The slice cannot wrap around the address space, so the conversion from usize
// to isize will not wrap either.
let len: isize = self.0.len() as isize;
unsafe { self.limit().offset(len) }
}
#[inline(always)]
fn limit(&self) -> *mut u8 {
self.0.as_ptr() as *mut u8
}
}