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use std::borrow::Cow;
use std::error;
use std::fmt;
use std::ops::{Deref, DerefMut};
use spinoso_exception::Fatal;
use crate::core::{ClassRegistry, TryConvertMut};
use crate::error::{Error, RubyException};
use crate::sys;
use crate::Artichoke;
#[derive(Default, Debug, Clone, Copy, Hash, PartialEq, Eq, PartialOrd, Ord)]
pub struct ArenaSavepointError {
_private: (),
}
impl ArenaSavepointError {
#[must_use]
pub const fn new() -> Self {
Self { _private: () }
}
}
impl fmt::Display for ArenaSavepointError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("Failed to create internal garbage collection savepoint")
}
}
impl error::Error for ArenaSavepointError {}
impl RubyException for ArenaSavepointError {
fn message(&self) -> Cow<'_, [u8]> {
Cow::Borrowed(b"Failed to create internal garbage collection savepoint")
}
fn name(&self) -> Cow<'_, str> {
"fatal".into()
}
fn vm_backtrace(&self, interp: &mut Artichoke) -> Option<Vec<Vec<u8>>> {
let _ = interp;
None
}
fn as_mrb_value(&self, interp: &mut Artichoke) -> Option<sys::mrb_value> {
let message = interp.try_convert_mut(self.message()).ok()?;
let value = interp.new_instance::<Fatal>(&[message]).ok().flatten()?;
Some(value.inner())
}
}
impl From<ArenaSavepointError> for Error {
fn from(exception: ArenaSavepointError) -> Self {
let err: Box<dyn RubyException> = Box::new(exception);
Self::from(err)
}
}
#[derive(Debug)]
pub struct ArenaIndex<'a> {
index: i32,
interp: &'a mut Artichoke,
}
impl<'a> ArenaIndex<'a> {
pub fn new(interp: &'a mut Artichoke) -> Result<Self, ArenaSavepointError> {
unsafe {
interp
.with_ffi_boundary(|mrb| sys::mrb_sys_gc_arena_save(mrb))
.map(move |index| Self { index, interp })
.map_err(|_| ArenaSavepointError::new())
}
}
pub fn restore(self) {
drop(self);
}
#[inline]
pub fn interp(&mut self) -> &mut Artichoke {
self.interp
}
}
impl<'a> Deref for ArenaIndex<'a> {
type Target = Artichoke;
#[inline]
fn deref(&self) -> &Self::Target {
&*self.interp
}
}
impl<'a> DerefMut for ArenaIndex<'a> {
#[inline]
fn deref_mut(&mut self) -> &mut Self::Target {
self.interp
}
}
impl<'a> Drop for ArenaIndex<'a> {
fn drop(&mut self) {
let idx = self.index;
let _ignored = unsafe {
self.interp
.with_ffi_boundary(|mrb| sys::mrb_sys_gc_arena_restore(mrb, idx))
};
}
}