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Manually implement Encodable for ProvenanceMap to avoid serializing an always-none option

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This commit is contained in:
Oli Scherer 2022-11-14 09:49:32 +00:00
parent b04166ff35
commit 03b2598924
1 changed files with 16 additions and 1 deletions
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17
compiler/rustc_middle/src/mir/interpret/allocation/provenance_map.rs
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@ -7,9 +7,10 @@ use rustc_data_structures::sorted_map::SortedMap;
use rustc_target::abi::{HasDataLayout, Size};
use super::{alloc_range, AllocError, AllocId, AllocRange, AllocResult, Provenance};
use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
/// Stores the provenance information of pointers stored in memory.
#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, TyEncodable, TyDecodable)]
#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
#[derive(HashStable)]
pub struct ProvenanceMap<Prov = AllocId> {
/// Provenance in this map applies from the given offset for an entire pointer-size worth of
@ -21,6 +22,20 @@ pub struct ProvenanceMap<Prov = AllocId> {
bytes: Option<Box<SortedMap<Size, Prov>>>,
}
impl<D: Decoder, Prov: Decodable<D>> Decodable<D> for ProvenanceMap<Prov> {
fn decode(d: &mut D) -> Self {
Self { ptrs: Decodable::decode(d), bytes: None }
}
}
impl<S: Encoder, Prov: Encodable<S>> Encodable<S> for ProvenanceMap<Prov> {
fn encode(&self, s: &mut S) {
let Self { ptrs, bytes } = self;
debug_assert!(bytes.is_none());
ptrs.encode(s)
}
}
impl<Prov> ProvenanceMap<Prov> {
pub fn new() -> Self {
ProvenanceMap { ptrs: SortedMap::new(), bytes: None }