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Overcome Sync issues with non-parallel compiler

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Per Mark's recommendation at:
https://github.com/rust-lang/rust/pull/78963#issuecomment-725790071
This commit is contained in:
Rich Kadel
2020-11-11 20:01:10 -08:00
parent bd0eb07af2
commit eb9f2bb3b0
2 changed files with 22 additions and 9 deletions
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19
compiler/rustc_mir/src/transform/coverage/tests.rs
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@@ -7,18 +7,19 @@ use rustc_data_structures::graph::WithNumNodes;
use rustc_data_structures::graph::WithSuccessors;
use rustc_index::vec::{Idx, IndexVec};
use rustc_middle::mir::*;
use rustc_middle::ty::{self, TyS};
use rustc_middle::ty::{self, DebruijnIndex, TyS, TypeFlags};
use rustc_span::DUMMY_SP;
use std::lazy::SyncOnceCell;
fn dummy_ty() -> &'static TyS<'static> {
thread_local! {
static DUMMY_TYS: &'static TyS<'static> = Box::leak(box TyS::make_for_test(
ty::Bool,
TypeFlags::empty(),
DebruijnIndex::from_usize(0),
));
}
fn dummy_ty<'tcx>() -> &'static TyS<'tcx> {
static DUMMY_TYS: SyncOnceCell<TyS<'_>> = SyncOnceCell::new();
&DUMMY_TYS.get_or_init(|| {
let fake_type_bytes = vec![0 as u8; std::mem::size_of::<TyS<'_>>()];
unsafe { std::ptr::read_unaligned::<TyS<'_>>(fake_type_bytes.as_ptr() as *const TyS<'_>) }
})
&DUMMY_TYS.with(|tys| *tys)
}
struct MockBlocks<'tcx> {