117 lines
4.2 KiB
Rust
117 lines
4.2 KiB
Rust
//@ compile-flags: -Zunleash-the-miri-inside-of-you
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//@ normalize-stderr-test: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
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//@ normalize-stderr-test: "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
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#![allow(static_mut_refs)]
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use std::cell::UnsafeCell;
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use std::sync::atomic::*;
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// # Plain `&mut` in the final value
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// This requires walking nested statics.
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static FOO: &&mut u32 = &&mut 42;
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//~^ ERROR it is undefined behavior to use this value
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//~| pointing to read-only memory
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static OH_YES: &mut i32 = &mut 42;
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//~^ ERROR it is undefined behavior to use this value
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//~| pointing to read-only memory
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static BAR: &mut () = &mut ();
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//~^ ERROR encountered mutable pointer in final value of static
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struct Foo<T>(T);
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static BOO: &mut Foo<()> = &mut Foo(());
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//~^ ERROR encountered mutable pointer in final value of static
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const BLUNT: &mut i32 = &mut 42;
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//~^ ERROR: it is undefined behavior to use this value
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//~| pointing to read-only memory
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const SUBTLE: &mut i32 = unsafe {
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//~^ ERROR: it is undefined behavior to use this value
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//~| constructing invalid value: encountered reference to mutable memory in `const`
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static mut STATIC: i32 = 0;
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&mut STATIC
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};
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// # Interior mutability
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struct Meh {
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x: &'static UnsafeCell<i32>,
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}
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unsafe impl Sync for Meh {}
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static MEH: Meh = Meh { x: &UnsafeCell::new(42) };
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//~^ ERROR it is undefined behavior to use this value
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//~| `UnsafeCell` in read-only memory
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// Same with a const:
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// the following will never be ok! no interior mut behind consts, because
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// all allocs interned here will be marked immutable.
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const MUH: Meh = Meh {
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//~^ ERROR it is undefined behavior to use this value
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//~| `UnsafeCell` in read-only memory
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x: &UnsafeCell::new(42),
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};
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struct Synced {
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x: UnsafeCell<i32>,
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}
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unsafe impl Sync for Synced {}
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// Make sure we also catch this behind a type-erased `dyn Trait` reference.
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const SNEAKY: &dyn Sync = &Synced { x: UnsafeCell::new(42) };
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//~^ ERROR: it is undefined behavior to use this value
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//~| `UnsafeCell` in read-only memory
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// # Check for mutable references to read-only memory
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static READONLY: i32 = 0;
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static mut MUT_TO_READONLY: &mut i32 = unsafe { &mut *(&READONLY as *const _ as *mut _) };
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//~^ ERROR: it is undefined behavior to use this value
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//~| pointing to read-only memory
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// # Check for consts pointing to mutable memory
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static mut MUTABLE: i32 = 42;
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const POINTS_TO_MUTABLE: &i32 = unsafe { &MUTABLE }; //~ERROR: undefined behavior
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//~| encountered reference to mutable memory
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static mut MUTABLE_REF: &mut i32 = &mut 42;
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const POINTS_TO_MUTABLE2: &i32 = unsafe { &*MUTABLE_REF };
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//~^ ERROR: evaluation of constant value failed
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//~| accesses mutable global memory
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const POINTS_TO_MUTABLE_INNER: *const i32 = &mut 42 as *mut _ as *const _;
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//~^ ERROR: mutable pointer in final value
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const POINTS_TO_MUTABLE_INNER2: *const i32 = &mut 42 as *const _;
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//~^ ERROR: mutable pointer in final value
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// This does *not* error since it uses a shared reference, and we have to ignore
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// those. See <https://github.com/rust-lang/rust/pull/128543>.
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const INTERIOR_MUTABLE_BEHIND_RAW: *mut i32 = &UnsafeCell::new(42) as *const _ as *mut _;
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struct SyncPtr<T> {
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x: *const T,
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}
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unsafe impl<T> Sync for SyncPtr<T> {}
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// These pass the lifetime checks because of the "tail expression" / "outer scope" rule. (This
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// relies on `SyncPtr` being a curly brace struct.) However, we intern the inner memory as
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// read-only, so ideally this should be rejected. Unfortunately, as explained in
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// <https://github.com/rust-lang/rust/pull/128543>, we have to accept it.
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// (Also see `static-no-inner-mut` for similar tests on `static`.)
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const RAW_SYNC: SyncPtr<AtomicI32> = SyncPtr { x: &AtomicI32::new(42) };
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// With mutable references at least, we can detect this and error.
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const RAW_MUT_CAST: SyncPtr<i32> = SyncPtr { x: &mut 42 as *mut _ as *const _ };
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//~^ ERROR mutable pointer in final value
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const RAW_MUT_COERCE: SyncPtr<i32> = SyncPtr { x: &mut 0 };
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//~^ ERROR mutable pointer in final value
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fn main() {
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unsafe {
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*MEH.x.get() = 99;
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}
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*OH_YES = 99; //~ ERROR cannot assign to `*OH_YES`, as `OH_YES` is an immutable static item
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}
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