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Recognise thread local statics in THIR unsafeck

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This commit is contained in:
Matthew Jasper 2023-10-26 15:33:41 +00:00
parent e1fcecb1b9
commit 931692fa13
4 changed files with 55 additions and 6 deletions
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4
compiler/rustc_mir_build/src/check_unsafety.rs
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@ -394,7 +394,9 @@ impl<'a, 'tcx> Visitor<'a, 'tcx> for UnsafetyVisitor<'a, 'tcx> {
} }
} }
ExprKind::Deref { arg } => { ExprKind::Deref { arg } => {
if let ExprKind::StaticRef { def_id, .. } = self.thir[arg].kind { if let ExprKind::StaticRef { def_id, .. } | ExprKind::ThreadLocalRef(def_id) =
self.thir[arg].kind
{
if self.tcx.is_mutable_static(def_id) { if self.tcx.is_mutable_static(def_id) {
self.requires_unsafe(expr.span, UseOfMutableStatic); self.requires_unsafe(expr.span, UseOfMutableStatic);
} else if self.tcx.is_foreign_item(def_id) { } else if self.tcx.is_foreign_item(def_id) {

10
tests/ui/thread-local/thread-local-static.stderr → tests/ui/thread-local/thread-local-static.mir.stderr
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@ -1,5 +1,5 @@
error[E0658]: mutable references are not allowed in constant functions error[E0658]: mutable references are not allowed in constant functions
--> $DIR/thread-local-static.rs:7:12 --> $DIR/thread-local-static.rs:10:12
| |
LL | const fn g(x: &mut [u32; 8]) { LL | const fn g(x: &mut [u32; 8]) {
| ^ | ^
@ -8,13 +8,13 @@ LL | const fn g(x: &mut [u32; 8]) {
= help: add `#![feature(const_mut_refs)]` to the crate attributes to enable = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
error[E0625]: thread-local statics cannot be accessed at compile-time error[E0625]: thread-local statics cannot be accessed at compile-time
--> $DIR/thread-local-static.rs:9:28 --> $DIR/thread-local-static.rs:12:28
| |
LL | std::mem::swap(x, &mut STATIC_VAR_2) LL | std::mem::swap(x, &mut STATIC_VAR_2)
| ^^^^^^^^^^^^ | ^^^^^^^^^^^^
error[E0013]: constant functions cannot refer to statics error[E0013]: constant functions cannot refer to statics
--> $DIR/thread-local-static.rs:9:28 --> $DIR/thread-local-static.rs:12:28
| |
LL | std::mem::swap(x, &mut STATIC_VAR_2) LL | std::mem::swap(x, &mut STATIC_VAR_2)
| ^^^^^^^^^^^^ | ^^^^^^^^^^^^
@ -22,7 +22,7 @@ LL | std::mem::swap(x, &mut STATIC_VAR_2)
= help: consider extracting the value of the `static` to a `const`, and referring to that = help: consider extracting the value of the `static` to a `const`, and referring to that
error[E0658]: mutable references are not allowed in constant functions error[E0658]: mutable references are not allowed in constant functions
--> $DIR/thread-local-static.rs:9:23 --> $DIR/thread-local-static.rs:12:23
| |
LL | std::mem::swap(x, &mut STATIC_VAR_2) LL | std::mem::swap(x, &mut STATIC_VAR_2)
| ^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^
@ -31,7 +31,7 @@ LL | std::mem::swap(x, &mut STATIC_VAR_2)
= help: add `#![feature(const_mut_refs)]` to the crate attributes to enable = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
error[E0133]: use of mutable static is unsafe and requires unsafe function or block error[E0133]: use of mutable static is unsafe and requires unsafe function or block
--> $DIR/thread-local-static.rs:9:23 --> $DIR/thread-local-static.rs:12:23
| |
LL | std::mem::swap(x, &mut STATIC_VAR_2) LL | std::mem::swap(x, &mut STATIC_VAR_2)
| ^^^^^^^^^^^^^^^^^ use of mutable static | ^^^^^^^^^^^^^^^^^ use of mutable static

3
tests/ui/thread-local/thread-local-static.rs
View File

@ -1,7 +1,10 @@
// edition:2018 // edition:2018
// revisions: mir thir
//thir: -Zthir-unsafeck
#![feature(thread_local)] #![feature(thread_local)]
#![feature(const_swap)] #![feature(const_swap)]
#[thread_local] #[thread_local]
static mut STATIC_VAR_2: [u32; 8] = [4; 8]; static mut STATIC_VAR_2: [u32; 8] = [4; 8];
const fn g(x: &mut [u32; 8]) { const fn g(x: &mut [u32; 8]) {

44
tests/ui/thread-local/thread-local-static.thir.stderr Normal file
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@ -0,0 +1,44 @@
error[E0658]: mutable references are not allowed in constant functions
--> $DIR/thread-local-static.rs:10:12
|
LL | const fn g(x: &mut [u32; 8]) {
| ^
|
= note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
= help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
error[E0625]: thread-local statics cannot be accessed at compile-time
--> $DIR/thread-local-static.rs:12:28
|
LL | std::mem::swap(x, &mut STATIC_VAR_2)
| ^^^^^^^^^^^^
error[E0013]: constant functions cannot refer to statics
--> $DIR/thread-local-static.rs:12:28
|
LL | std::mem::swap(x, &mut STATIC_VAR_2)
| ^^^^^^^^^^^^
|
= help: consider extracting the value of the `static` to a `const`, and referring to that
error[E0658]: mutable references are not allowed in constant functions
--> $DIR/thread-local-static.rs:12:23
|
LL | std::mem::swap(x, &mut STATIC_VAR_2)
| ^^^^^^^^^^^^^^^^^
|
= note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
= help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
error[E0133]: use of mutable static is unsafe and requires unsafe function or block
--> $DIR/thread-local-static.rs:12:23
|
LL | std::mem::swap(x, &mut STATIC_VAR_2)
| ^^^^^^^^^^^^^^^^^ use of mutable static
|
= note: mutable statics can be mutated by multiple threads: aliasing violations or data races will cause undefined behavior
error: aborting due to 5 previous errors
Some errors have detailed explanations: E0013, E0133, E0625, E0658.
For more information about an error, try `rustc --explain E0013`.