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more tagging

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This commit is contained in:
nora 2022-04-10 15:23:10 +02:00
parent f0fae6c7cf
commit 8e211ce386
1 changed files with 51 additions and 1 deletions
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52
src/tag.rs
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@ -1,13 +1,60 @@
#![allow(dead_code)]
use core::marker::PhantomData;
use sptr::Strict;
use crate::Backend;
pub struct TaggedPtr<T, S, B = usize>(B::Stored, PhantomData<S>)
where
B: Backend<T>;
impl<T, S, B> TaggedPtr<T, S, B>
where
S: TaggingStrategy<B>,
B: Backend<T>,
{
pub fn new(ptr: *mut T, tag: S::Tag) -> Self {
let addr = Strict::addr(ptr);
let tagged = S::set(addr, tag);
let stored = B::set_ptr(ptr, tagged);
TaggedPtr(stored, PhantomData)
}
pub fn get_ptr(&self) -> *mut T {
let (provenance, stored) = B::get_ptr(self.0);
let addr = S::get_ptr_addr(stored);
Strict::with_addr(provenance, addr)
}
pub fn get_tag(&self) -> S::Tag {
let stored = B::get_int(self.0);
S::get_tag(stored)
}
pub fn set_tag(&self, tag: S::Tag) -> Self {
let (provenance, stored) = B::get_ptr(self.0);
let ptr_addr = S::get_ptr_addr(stored);
let addr = S::set(ptr_addr, tag);
let stored = B::set_ptr(provenance, addr);
TaggedPtr(stored, PhantomData)
}
}
impl<T, S, B> Clone for TaggedPtr<T, S, B>
where
B: Backend<T>,
{
fn clone(&self) -> Self {
TaggedPtr(self.0, self.1)
}
}
impl<T, S, B> Copy for TaggedPtr<T, S, B> where B: Backend<T> {}
pub trait TaggingStrategy<B> {
type Tag;
type Tag: Copy;
fn get_tag(data: B) -> Self::Tag;
@ -15,3 +62,6 @@ pub trait TaggingStrategy<B> {
fn set(addr: usize, tag: Self::Tag) -> B;
}
#[cfg(test)]
mod tests {}