rust/tests/run-make/atomic-lock-free/atomic_lock_free.rs

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#![feature(no_core, intrinsics, lang_items)]
#![crate_type="rlib"]
#![no_core]
extern "rust-intrinsic" {
fn atomic_xadd_seqcst<T>(dst: *mut T, src: T) -> T;
}
#[lang = "sized"]
trait Sized {}
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#[lang = "copy"]
trait Copy {}
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#[lang = "freeze"]
trait Freeze {}
Move some implementations of Clone and Copy to libcore Add implementations of `Clone` and `Copy` for some primitive types to libcore so that they show up in the documentation. The concerned types are the following: * All primitive signed and unsigned integer types (`usize`, `u8`, `u16`, `u32`, `u64`, `u128`, `isize`, `i8`, `i16`, `i32`, `i64`, `i128`); * All primitive floating point types (`f32`, `f64`) * `bool` * `char` * `!` * Raw pointers (`*const T` and `*mut T`) * Shared references (`&'a T`) These types already implemented `Clone` and `Copy`, but the implementation was provided by the compiler. The compiler no longer provides these implementations and instead tries to look them up as normal trait implementations. The goal of this change is to make the implementations appear in the generated documentation. For `Copy` specifically, the compiler would reject an attempt to write an `impl` for the primitive types listed above with error `E0206`; this error no longer occurs for these types, but it will still occur for the other types that used to raise that error. The trait implementations are guarded with `#[cfg(not(stage0))]` because they are invalid according to the stage0 compiler. When the stage0 compiler is updated to a revision that includes this change, the attribute will have to be removed, otherwise the stage0 build will fail because the types mentioned above no longer implement `Clone` or `Copy`. For type variants that are variadic, such as tuples and function pointers, and for array types, the `Clone` and `Copy` implementations are still provided by the compiler, because the language is not expressive enough yet to be able to write the appropriate implementations in Rust. The initial plan was to add `impl` blocks guarded by `#[cfg(dox)]` to make them apply only when generating documentation, without having to touch the compiler. However, rustdoc's usage of the compiler still rejected those `impl` blocks. This is a [breaking-change] for users of `#![no_core]`, because they will now have to supply their own implementations of `Clone` and `Copy` for the primitive types listed above. The easiest way to do that is to simply copy the implementations from `src/libcore/clone.rs` and `src/libcore/marker.rs`. Fixes #25893
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impl<T: ?Sized> Copy for *mut T {}
#[cfg(target_has_atomic = "8")]
pub unsafe fn atomic_u8(x: *mut u8) {
atomic_xadd_seqcst(x, 1);
atomic_xadd_seqcst(x, 1);
}
#[cfg(target_has_atomic = "8")]
pub unsafe fn atomic_i8(x: *mut i8) {
atomic_xadd_seqcst(x, 1);
}
#[cfg(target_has_atomic = "16")]
pub unsafe fn atomic_u16(x: *mut u16) {
atomic_xadd_seqcst(x, 1);
}
#[cfg(target_has_atomic = "16")]
pub unsafe fn atomic_i16(x: *mut i16) {
atomic_xadd_seqcst(x, 1);
}
#[cfg(target_has_atomic = "32")]
pub unsafe fn atomic_u32(x: *mut u32) {
atomic_xadd_seqcst(x, 1);
}
#[cfg(target_has_atomic = "32")]
pub unsafe fn atomic_i32(x: *mut i32) {
atomic_xadd_seqcst(x, 1);
}
#[cfg(target_has_atomic = "64")]
pub unsafe fn atomic_u64(x: *mut u64) {
atomic_xadd_seqcst(x, 1);
}
#[cfg(target_has_atomic = "64")]
pub unsafe fn atomic_i64(x: *mut i64) {
atomic_xadd_seqcst(x, 1);
}
#[cfg(target_has_atomic = "128")]
pub unsafe fn atomic_u128(x: *mut u128) {
atomic_xadd_seqcst(x, 1);
}
#[cfg(target_has_atomic = "128")]
pub unsafe fn atomic_i128(x: *mut i128) {
atomic_xadd_seqcst(x, 1);
}
#[cfg(target_has_atomic = "ptr")]
pub unsafe fn atomic_usize(x: *mut usize) {
atomic_xadd_seqcst(x, 1);
}
#[cfg(target_has_atomic = "ptr")]
pub unsafe fn atomic_isize(x: *mut isize) {
atomic_xadd_seqcst(x, 1);
}