ambee/giterated

More restructuring

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Amber - ⁨1⁩ year ago

parent: tbd commit: ⁨10b7b7c⁩

⁨giterated-runtime/giterated-abi/src/heap.rs⁩ - ⁨925⁩ bytes

Raw

1	use std::{mem::MaybeUninit, ptr::drop_in_place};
2
3	use crate::{abi_backing::HeapValueBacking, FfiValue};
4
5	pub trait HeapPlacable {
6	unsafe extern "C" fn free(value: FfiValue<Self>, taken: bool);
7	}
8
9	impl<T> HeapPlacable for T {
10	unsafe extern "C" fn free(value: FfiValue<Self>, taken: bool) {
11	if !taken {
12	drop(Box::from_raw(value.inner as *mut HeapValueBacking<T>))
13	} else {
14	let allocation = Box::from_raw(value.inner as *mut T);
15
16	// Since we "took" the value, kindly inform the compiler that it can't
17	// treat the value like it exists
18	let allocation_uninit: Box<HeapValueBacking<MaybeUninit<T>>> =
19	unsafe { core::mem::transmute(allocation) };
20
21	// Since the compiler has no idea whether the value exists or not, it won't try and
22	// drop it. Success!
23	drop(allocation_uninit);
24	}
25	}
26	}
27