twizzler/alloc/
global.rs

1use std::alloc::Layout;
2
3use twizzler_abi::object::ObjID;
4
5use super::Allocator;
6use crate::{
7    marker::Invariant,
8    ptr::{GlobalPtr, Ref},
9};
10
11/// A global pointer that owns the memory it points to, and will free it on drop.
12pub struct OwnedGlobalPtr<T, A: Allocator> {
13    global: GlobalPtr<T>,
14    alloc: A,
15}
16
17unsafe impl<T: Invariant, A: Allocator> Invariant for OwnedGlobalPtr<T, A> {}
18
19impl<T, A: Allocator> Drop for OwnedGlobalPtr<T, A> {
20    fn drop(&mut self) {
21        let layout = Layout::new::<T>();
22        unsafe { self.alloc.dealloc(self.global().cast(), layout) };
23    }
24}
25
26impl<T, A: Allocator> OwnedGlobalPtr<T, A> {
27    pub fn global(&self) -> GlobalPtr<T> {
28        self.global
29    }
30
31    pub unsafe fn from_global(global: GlobalPtr<T>, alloc: A) -> Self {
32        Self { global, alloc }
33    }
34
35    pub fn resolve<'a>(&'a self) -> Ref<'a, T> {
36        unsafe { self.global.resolve() }
37    }
38
39    pub fn allocator(&self) -> &A {
40        &self.alloc
41    }
42
43    /// Returns the object ID of the global pointer.
44    pub fn id(&self) -> ObjID {
45        self.global().id()
46    }
47
48    /// Returns the offset of the global pointer.
49    pub fn offset(&self) -> u64 {
50        self.global().offset()
51    }
52}
twizzler/alloc/global.rs

twizzler/alloc/
global.rs
