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pub use std::cell::Cell;
use core::cmp::Ordering;
use core::fmt::{self, Debug};
/// A mutable Wasm-memory location.
#[repr(transparent)]
pub struct WasmCell<'a, T: ?Sized> {
inner: &'a Cell<T>,
}
unsafe impl<T: ?Sized> Send for WasmCell<'_, T> where T: Send {}
unsafe impl<T: ?Sized> Sync for WasmCell<'_, T> {}
impl<'a, T: Copy> Clone for WasmCell<'a, T> {
#[inline]
fn clone(&self) -> WasmCell<'a, T> {
WasmCell { inner: self.inner }
}
}
impl<T: PartialEq + Copy> PartialEq for WasmCell<'_, T> {
#[inline]
fn eq(&self, other: &WasmCell<T>) -> bool {
self.inner.eq(&other.inner)
}
}
impl<T: Eq + Copy> Eq for WasmCell<'_, T> {}
impl<T: PartialOrd + Copy> PartialOrd for WasmCell<'_, T> {
#[inline]
fn partial_cmp(&self, other: &WasmCell<T>) -> Option<Ordering> {
self.inner.partial_cmp(&other.inner)
}
#[inline]
fn lt(&self, other: &WasmCell<T>) -> bool {
self.inner < other.inner
}
#[inline]
fn le(&self, other: &WasmCell<T>) -> bool {
self.inner <= other.inner
}
#[inline]
fn gt(&self, other: &WasmCell<T>) -> bool {
self.inner > other.inner
}
#[inline]
fn ge(&self, other: &WasmCell<T>) -> bool {
self.inner >= other.inner
}
}
impl<T: Ord + Copy> Ord for WasmCell<'_, T> {
#[inline]
fn cmp(&self, other: &WasmCell<T>) -> Ordering {
self.inner.cmp(&other.inner)
}
}
impl<'a, T> WasmCell<'a, T> {
/// Creates a new `WasmCell` containing the given value.
///
/// # Examples
///
/// ```
/// use std::cell::Cell;
/// use wasmer::WasmCell;
///
/// let cell = Cell::new(5);
/// let wasm_cell = WasmCell::new(&cell);
/// ```
#[inline]
pub const fn new(cell: &'a Cell<T>) -> WasmCell<'a, T> {
WasmCell { inner: cell }
}
}
impl<'a, T: Copy> WasmCell<'a, T> {
/// Returns a copy of the contained value.
///
/// # Examples
///
/// ```
/// use std::cell::Cell;
/// use wasmer::WasmCell;
///
/// let cell = Cell::new(5);
/// let wasm_cell = WasmCell::new(&cell);
/// let five = wasm_cell.get();
/// ```
#[inline]
pub fn get(&self) -> T {
self.inner.get()
}
/// Get an unsafe mutable pointer to the inner item
/// in the Cell.
///
/// # Safety
///
/// This method is highly discouraged to use. We have it for
/// compatibility reasons with Emscripten.
/// It is unsafe because changing an item inline will change
/// the underlying memory.
///
/// It's highly encouraged to use the `set` method instead.
#[deprecated(
since = "2.0.0",
note = "Please use the memory-safe set method instead"
)]
#[doc(hidden)]
pub unsafe fn get_mut(&self) -> &'a mut T {
&mut *self.inner.as_ptr()
}
}
impl<T: Debug + Copy> Debug for WasmCell<'_, T> {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "WasmCell({:?})", self.inner.get())
}
}
impl<T: Sized> WasmCell<'_, T> {
/// Sets the contained value.
///
/// # Examples
///
/// ```
/// use std::cell::Cell;
/// use wasmer::WasmCell;
///
/// let cell = Cell::new(5);
/// let wasm_cell = WasmCell::new(&cell);
/// wasm_cell.set(10);
/// assert_eq!(cell.get(), 10);
/// ```
#[inline]
pub fn set(&self, val: T) {
self.inner.set(val);
}
}