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Perform Sync check on static items in wf-check instead of during const checks

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This commit is contained in:
Oli Scherer 2021-11-26 14:11:45 +00:00
parent 1e79d79dac
commit 18694126b1
22 changed files with 105 additions and 136 deletions
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29
compiler/rustc_const_eval/src/transform/check_consts/check.rs
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@ -1,8 +1,8 @@
//! The `Visitor` responsible for actually checking a `mir::Body` for invalid operations.
use rustc_errors::{Applicability, Diagnostic, ErrorReported};
use rustc_hir as hir;
use rustc_hir::def_id::DefId;
use rustc_hir::{self as hir, HirId, LangItem};
use rustc_index::bit_set::BitSet;
use rustc_infer::infer::TyCtxtInferExt;
use rustc_infer::traits::{ImplSource, Obligation, ObligationCause};
@ -14,8 +14,7 @@ use rustc_middle::ty::{self, adjustment::PointerCast, Instance, InstanceDef, Ty,
use rustc_middle::ty::{Binder, TraitPredicate, TraitRef};
use rustc_mir_dataflow::{self, Analysis};
use rustc_span::{sym, Span, Symbol};
use rustc_trait_selection::traits::error_reporting::InferCtxtExt;
use rustc_trait_selection::traits::{self, SelectionContext, TraitEngine};
use rustc_trait_selection::traits::SelectionContext;
use std::mem;
use std::ops::Deref;
@ -255,16 +254,6 @@ impl Checker<'mir, 'tcx> {
self.visit_body(&body);
}
// Ensure that the end result is `Sync` in a non-thread local `static`.
let should_check_for_sync = self.const_kind()
== hir::ConstContext::Static(hir::Mutability::Not)
&& !tcx.is_thread_local_static(def_id.to_def_id());
if should_check_for_sync {
let hir_id = tcx.hir().local_def_id_to_hir_id(def_id);
check_return_ty_is_sync(tcx, &body, hir_id);
}
// If we got through const-checking without emitting any "primary" errors, emit any
// "secondary" errors if they occurred.
let secondary_errors = mem::take(&mut self.secondary_errors);
@ -1054,20 +1043,6 @@ impl Visitor<'tcx> for Checker<'mir, 'tcx> {
}
}
fn check_return_ty_is_sync(tcx: TyCtxt<'tcx>, body: &Body<'tcx>, hir_id: HirId) {
let ty = body.return_ty();
tcx.infer_ctxt().enter(|infcx| {
let cause = traits::ObligationCause::new(body.span, hir_id, traits::SharedStatic);
let mut fulfillment_cx = traits::FulfillmentContext::new();
let sync_def_id = tcx.require_lang_item(LangItem::Sync, Some(body.span));
fulfillment_cx.register_bound(&infcx, ty::ParamEnv::empty(), ty, sync_def_id, cause);
let errors = fulfillment_cx.select_all_or_error(&infcx);
if !errors.is_empty() {
infcx.report_fulfillment_errors(&errors, None, false);
}
});
}
fn place_as_reborrow(
tcx: TyCtxt<'tcx>,
body: &Body<'tcx>,

14
compiler/rustc_typeck/src/check/wfcheck.rs
View File

@ -1060,6 +1060,20 @@ fn check_item_type(tcx: TyCtxt<'_>, item_id: LocalDefId, ty_span: Span, allow_fo
);
}
// Ensure that the end result is `Sync` in a non-thread local `static`.
let should_check_for_sync = tcx.static_mutability(item_id.to_def_id())
== Some(hir::Mutability::Not)
&& !tcx.is_foreign_item(item_id.to_def_id())
&& !tcx.is_thread_local_static(item_id.to_def_id());
if should_check_for_sync {
fcx.register_bound(
item_ty,
tcx.require_lang_item(LangItem::Sync, Some(ty_span)),
traits::ObligationCause::new(ty_span, fcx.body_id, traits::SharedStatic),
);
}
// No implied bounds in a const, etc.
FxHashSet::default()
});

6
src/test/ui/consts/const-cast-different-types.rs
View File

@ -1,6 +1,6 @@
static a: &'static str = "foo";
static b: *const u8 = a as *const u8; //~ ERROR casting
static c: *const u8 = &a as *const u8; //~ ERROR casting
const a: &str = "foo";
const b: *const u8 = a as *const u8; //~ ERROR casting
const c: *const u8 = &a as *const u8; //~ ERROR casting
fn main() {
}

8
src/test/ui/consts/const-cast-different-types.stderr
View File

@ -1,13 +1,13 @@
error[E0606]: casting `&'static str` as `*const u8` is invalid
--> $DIR/const-cast-different-types.rs:2:23
--> $DIR/const-cast-different-types.rs:2:22
|
LL | static b: *const u8 = a as *const u8;
LL | const b: *const u8 = a as *const u8;
| ^^^^^^^^^^^^^^
error[E0606]: casting `&&'static str` as `*const u8` is invalid
--> $DIR/const-cast-different-types.rs:3:23
--> $DIR/const-cast-different-types.rs:3:22
|
LL | static c: *const u8 = &a as *const u8;
LL | const c: *const u8 = &a as *const u8;
| ^^^^^^^^^^^^^^^
error: aborting due to 2 previous errors

4
src/test/ui/consts/const-cast-wrong-type.rs
View File

@ -1,5 +1,5 @@
static a: [u8; 3] = ['h' as u8, 'i' as u8, 0 as u8];
static b: *const i8 = &a as *const i8; //~ ERROR mismatched types
const a: [u8; 3] = ['h' as u8, 'i' as u8, 0 as u8];
const b: *const i8 = &a as *const i8; //~ ERROR mismatched types
fn main() {
}

4
src/test/ui/consts/const-cast-wrong-type.stderr
View File

@ -1,7 +1,7 @@
error[E0308]: mismatched types
--> $DIR/const-cast-wrong-type.rs:2:23
--> $DIR/const-cast-wrong-type.rs:2:22
|
LL | static b: *const i8 = &a as *const i8;
LL | const b: *const i8 = &a as *const i8;
| ^^^^^^^^^^^^^^^ expected `u8`, found `i8`
error: aborting due to previous error

4
src/test/ui/impl-trait/issues/issue-86201.rs
View File

@ -2,9 +2,9 @@
#![feature(type_alias_impl_trait)]
type FunType = impl Fn<()>;
//~^ could not find defining uses
//~^ ERROR could not find defining uses
static STATIC_FN: FunType = some_fn;
//~^ mismatched types
//~^ ERROR mismatched types
fn some_fn() {}

27
src/test/ui/issues/issue-16538.mir.stderr
View File

@ -1,27 +1,26 @@
error[E0015]: calls in statics are limited to constant functions, tuple structs and tuple variants
--> $DIR/issue-16538.rs:14:27
--> $DIR/issue-16538.rs:15:23
|
LL | static foo: *const Y::X = Y::foo(Y::x as *const Y::X);
LL | static foo: &Y::X = &*Y::foo(Y::x as *const Y::X);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0277]: `*const usize` cannot be shared between threads safely
--> $DIR/issue-16538.rs:14:1
|
LL | static foo: *const Y::X = Y::foo(Y::x as *const Y::X);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `*const usize` cannot be shared between threads safely
|
= help: the trait `Sync` is not implemented for `*const usize`
= note: shared static variables must have a type that implements `Sync`
error[E0133]: use of extern static is unsafe and requires unsafe function or block
--> $DIR/issue-16538.rs:14:34
--> $DIR/issue-16538.rs:15:30
|
LL | static foo: *const Y::X = Y::foo(Y::x as *const Y::X);
LL | static foo: &Y::X = &*Y::foo(Y::x as *const Y::X);
| ^^^^ use of extern static
|
= note: extern statics are not controlled by the Rust type system: invalid data, aliasing violations or data races will cause undefined behavior
error[E0133]: dereference of raw pointer is unsafe and requires unsafe function or block
--> $DIR/issue-16538.rs:15:21
|
LL | static foo: &Y::X = &*Y::foo(Y::x as *const Y::X);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ dereference of raw pointer
|
= note: raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0015, E0133, E0277.
Some errors have detailed explanations: E0015, E0133.
For more information about an error, try `rustc --explain E0015`.

5
src/test/ui/issues/issue-16538.rs
View File

@ -1,6 +1,7 @@
// revisions: mir thir
// [thir]compile-flags: -Z thir-unsafeck
#![feature(const_raw_ptr_deref)]
mod Y {
pub type X = usize;
extern "C" {
@ -11,8 +12,8 @@ mod Y {
}
}
static foo: *const Y::X = Y::foo(Y::x as *const Y::X);
//~^ ERROR `*const usize` cannot be shared between threads safely [E0277]
static foo: &Y::X = &*Y::foo(Y::x as *const Y::X);
//~^ ERROR dereference of raw pointer
//~| ERROR E0015
//~| ERROR use of extern static is unsafe and requires

29
src/test/ui/issues/issue-16538.thir.stderr
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@ -1,27 +1,26 @@
error[E0133]: use of extern static is unsafe and requires unsafe function or block
--> $DIR/issue-16538.rs:14:34
error[E0133]: dereference of raw pointer is unsafe and requires unsafe function or block
--> $DIR/issue-16538.rs:15:22
|
LL | static foo: *const Y::X = Y::foo(Y::x as *const Y::X);
LL | static foo: &Y::X = &*Y::foo(Y::x as *const Y::X);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ dereference of raw pointer
|
= note: raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior
error[E0133]: use of extern static is unsafe and requires unsafe function or block
--> $DIR/issue-16538.rs:15:30
|
LL | static foo: &Y::X = &*Y::foo(Y::x as *const Y::X);
| ^^^^ use of extern static
|
= note: extern statics are not controlled by the Rust type system: invalid data, aliasing violations or data races will cause undefined behavior
error[E0015]: calls in statics are limited to constant functions, tuple structs and tuple variants
--> $DIR/issue-16538.rs:14:27
--> $DIR/issue-16538.rs:15:23
|
LL | static foo: *const Y::X = Y::foo(Y::x as *const Y::X);
LL | static foo: &Y::X = &*Y::foo(Y::x as *const Y::X);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0277]: `*const usize` cannot be shared between threads safely
--> $DIR/issue-16538.rs:14:1
|
LL | static foo: *const Y::X = Y::foo(Y::x as *const Y::X);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `*const usize` cannot be shared between threads safely
|
= help: the trait `Sync` is not implemented for `*const usize`
= note: shared static variables must have a type that implements `Sync`
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0015, E0133, E0277.
Some errors have detailed explanations: E0015, E0133.
For more information about an error, try `rustc --explain E0015`.

4
src/test/ui/issues/issue-17718-static-sync.stderr
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@ -1,8 +1,8 @@
error[E0277]: `Foo` cannot be shared between threads safely
--> $DIR/issue-17718-static-sync.rs:9:1
--> $DIR/issue-17718-static-sync.rs:9:13
|
LL | static BAR: Foo = Foo;
| ^^^^^^^^^^^^^^^^^^^^^^ `Foo` cannot be shared between threads safely
| ^^^ `Foo` cannot be shared between threads safely
|
= help: the trait `Sync` is not implemented for `Foo`
= note: shared static variables must have a type that implements `Sync`

1
src/test/ui/issues/issue-24446.rs
View File

@ -1,6 +1,7 @@
fn main() {
static foo: dyn Fn() -> u32 = || -> u32 {
//~^ ERROR the size for values of type
//~| ERROR cannot be shared between threads safely
0
};
}

11
src/test/ui/issues/issue-24446.stderr
View File

@ -6,6 +6,15 @@ LL | static foo: dyn Fn() -> u32 = || -> u32 {
|
= help: the trait `Sized` is not implemented for `(dyn Fn() -> u32 + 'static)`
error: aborting due to previous error
error[E0277]: `(dyn Fn() -> u32 + 'static)` cannot be shared between threads safely
--> $DIR/issue-24446.rs:2:17
|
LL | static foo: dyn Fn() -> u32 = || -> u32 {
| ^^^^^^^^^^^^^^^ `(dyn Fn() -> u32 + 'static)` cannot be shared between threads safely
|
= help: the trait `Sync` is not implemented for `(dyn Fn() -> u32 + 'static)`
= note: shared static variables must have a type that implements `Sync`
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0277`.

4
src/test/ui/issues/issue-5216.rs
View File

@ -1,10 +1,10 @@
fn f() { }
struct S(Box<dyn FnMut()>);
struct S(Box<dyn FnMut() + Sync>);
pub static C: S = S(f); //~ ERROR mismatched types
fn g() { }
type T = Box<dyn FnMut()>;
type T = Box<dyn FnMut() + Sync>;
pub static D: T = g; //~ ERROR mismatched types
fn main() {}

4
src/test/ui/issues/issue-5216.stderr
View File

@ -4,7 +4,7 @@ error[E0308]: mismatched types
LL | pub static C: S = S(f);
| ^ expected struct `Box`, found fn item
|
= note: expected struct `Box<(dyn FnMut() + 'static)>`
= note: expected struct `Box<(dyn FnMut() + Sync + 'static)>`
found fn item `fn() {f}`
error[E0308]: mismatched types
@ -13,7 +13,7 @@ error[E0308]: mismatched types
LL | pub static D: T = g;
| ^ expected struct `Box`, found fn item
|
= note: expected struct `Box<(dyn FnMut() + 'static)>`
= note: expected struct `Box<(dyn FnMut() + Sync + 'static)>`
found fn item `fn() {g}`
error: aborting due to 2 previous errors

3
src/test/ui/issues/issue-7364.rs
View File

@ -4,7 +4,6 @@ use std::cell::RefCell;
// Regression test for issue 7364
static boxed: Box<RefCell<isize>> = box RefCell::new(0);
//~^ ERROR allocations are not allowed in statics
//~| ERROR `RefCell<isize>` cannot be shared between threads safely [E0277]
//~^ ERROR `RefCell<isize>` cannot be shared between threads safely [E0277]
fn main() { }

15
src/test/ui/issues/issue-7364.stderr
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@ -1,21 +1,14 @@
error[E0010]: allocations are not allowed in statics
--> $DIR/issue-7364.rs:6:37
|
LL | static boxed: Box<RefCell<isize>> = box RefCell::new(0);
| ^^^^^^^^^^^^^^^^^^^ allocation not allowed in statics
error[E0277]: `RefCell<isize>` cannot be shared between threads safely
--> $DIR/issue-7364.rs:6:1
--> $DIR/issue-7364.rs:6:15
|
LL | static boxed: Box<RefCell<isize>> = box RefCell::new(0);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `RefCell<isize>` cannot be shared between threads safely
| ^^^^^^^^^^^^^^^^^^^ `RefCell<isize>` cannot be shared between threads safely
|
= help: the trait `Sync` is not implemented for `RefCell<isize>`
= note: required because of the requirements on the impl of `Sync` for `Unique<RefCell<isize>>`
= note: required because it appears within the type `Box<RefCell<isize>>`
= note: shared static variables must have a type that implements `Sync`
error: aborting due to 2 previous errors
error: aborting due to previous error
Some errors have detailed explanations: E0010, E0277.
For more information about an error, try `rustc --explain E0010`.
For more information about this error, try `rustc --explain E0277`.

34
src/test/ui/rfc1623.nll.stderr
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@ -1,26 +1,5 @@
error[E0277]: `dyn for<'a, 'b> Fn(&'a Foo<'b>) -> &'a Foo<'b>` cannot be shared between threads safely
--> $DIR/rfc1623.rs:21:1
|
LL | / static SOME_STRUCT: &SomeStruct = &SomeStruct {
LL | | foo: &Foo { bools: &[false, true] },
LL | | bar: &Bar { bools: &[true, true] },
LL | | f: &id,
LL | |
LL | | };
| |__^ `dyn for<'a, 'b> Fn(&'a Foo<'b>) -> &'a Foo<'b>` cannot be shared between threads safely
|
= help: within `&SomeStruct`, the trait `Sync` is not implemented for `dyn for<'a, 'b> Fn(&'a Foo<'b>) -> &'a Foo<'b>`
= note: required because it appears within the type `&dyn for<'a, 'b> Fn(&'a Foo<'b>) -> &'a Foo<'b>`
note: required because it appears within the type `SomeStruct`
--> $DIR/rfc1623.rs:11:8
|
LL | struct SomeStruct<'x, 'y, 'z: 'x> {
| ^^^^^^^^^^
= note: required because it appears within the type `&SomeStruct`
= note: shared static variables must have a type that implements `Sync`
error[E0308]: mismatched types
--> $DIR/rfc1623.rs:21:35
--> $DIR/rfc1623.rs:25:35
|
LL | static SOME_STRUCT: &SomeStruct = &SomeStruct {
| ___________________________________^
@ -35,7 +14,7 @@ LL | | };
found type `Fn<(&Foo<'_>,)>`
error[E0308]: mismatched types
--> $DIR/rfc1623.rs:21:35
--> $DIR/rfc1623.rs:25:35
|
LL | static SOME_STRUCT: &SomeStruct = &SomeStruct {
| ___________________________________^
@ -50,7 +29,7 @@ LL | | };
found type `Fn<(&Foo<'_>,)>`
error: implementation of `FnOnce` is not general enough
--> $DIR/rfc1623.rs:21:35
--> $DIR/rfc1623.rs:25:35
|
LL | static SOME_STRUCT: &SomeStruct = &SomeStruct {
| ___________________________________^
@ -65,7 +44,7 @@ LL | | };
= note: ...but it actually implements `FnOnce<(&'2 Foo<'_>,)>`, for some specific lifetime `'2`
error: implementation of `FnOnce` is not general enough
--> $DIR/rfc1623.rs:21:35
--> $DIR/rfc1623.rs:25:35
|
LL | static SOME_STRUCT: &SomeStruct = &SomeStruct {
| ___________________________________^
@ -79,7 +58,6 @@ LL | | };
= note: `fn(&Foo<'2>) -> &Foo<'2> {id::<&Foo<'2>>}` must implement `FnOnce<(&'a Foo<'1>,)>`, for any lifetime `'1`...
= note: ...but it actually implements `FnOnce<(&Foo<'2>,)>`, for some specific lifetime `'2`
error: aborting due to 5 previous errors
error: aborting due to 4 previous errors
Some errors have detailed explanations: E0277, E0308.
For more information about an error, try `rustc --explain E0277`.
For more information about this error, try `rustc --explain E0308`.

4
src/test/ui/rfc1623.rs
View File

@ -14,6 +14,10 @@ struct SomeStruct<'x, 'y, 'z: 'x> {
f: &'y dyn for<'a, 'b> Fn(&'a Foo<'b>) -> &'a Foo<'b>,
}
// Without this, the wf-check will fail early so we'll never see the
// error in SOME_STRUCT's body.
unsafe impl<'x, 'y, 'z: 'x> Sync for SomeStruct<'x, 'y, 'z> {}
fn id<T>(t: T) -> T {
t
}

2
src/test/ui/rfc1623.stderr
View File

@ -1,5 +1,5 @@
error: implementation of `FnOnce` is not general enough
--> $DIR/rfc1623.rs:24:8
--> $DIR/rfc1623.rs:28:8
|
LL | f: &id,
| ^^^ implementation of `FnOnce` is not general enough

9
src/test/ui/type-alias-impl-trait/static-const-types.rs
View File

@ -5,12 +5,9 @@
use std::fmt::Debug;
type Foo = impl Debug;
//~^ ERROR: could not find defining uses
type Foo = impl Debug; //~ ERROR could not find defining uses
static FOO1: Foo = 22_u32;
//~^ ERROR: mismatched types [E0308]
const FOO2: Foo = 22_u32;
//~^ ERROR: mismatched types [E0308]
static FOO1: Foo = 22_u32; //~ ERROR mismatched types
const FOO2: Foo = 22_u32; //~ ERROR mismatched types
fn main() {}

6
src/test/ui/type-alias-impl-trait/static-const-types.stderr
View File

@ -1,9 +1,9 @@
error[E0308]: mismatched types
--> $DIR/static-const-types.rs:11:20
--> $DIR/static-const-types.rs:10:20
|
LL | type Foo = impl Debug;
| ---------- the expected opaque type
...
LL |
LL | static FOO1: Foo = 22_u32;
| ^^^^^^ expected opaque type, found `u32`
|
@ -11,7 +11,7 @@ LL | static FOO1: Foo = 22_u32;
found type `u32`
error[E0308]: mismatched types
--> $DIR/static-const-types.rs:13:19
--> $DIR/static-const-types.rs:11:19
|
LL | type Foo = impl Debug;
| ---------- the expected opaque type