From 5534cb0a4a3907db50956f7664ab2e5c3b2bc00a Mon Sep 17 00:00:00 2001 From: Ding Xiang Fei Date: Sat, 10 Aug 2024 21:11:07 +0800 Subject: [PATCH] derive(SmartPointer): register helper attributes --- compiler/rustc_feature/src/builtin_attrs.rs | 6 --- library/core/src/marker.rs | 2 +- .../deriving/auxiliary/another-proc-macro.rs | 45 +++++++++++++++++++ .../ui/deriving/built-in-proc-macro-scope.rs | 25 +++++++++++ .../deriving/built-in-proc-macro-scope.stdout | 43 ++++++++++++++++++ .../deriving/proc-macro-attribute-mixing.rs | 20 +++++++++ .../proc-macro-attribute-mixing.stdout | 30 +++++++++++++ .../feature-gate-derive-smart-pointer.rs | 1 - .../feature-gate-derive-smart-pointer.stderr | 12 +---- 9 files changed, 165 insertions(+), 19 deletions(-) create mode 100644 tests/ui/deriving/auxiliary/another-proc-macro.rs create mode 100644 tests/ui/deriving/built-in-proc-macro-scope.rs create mode 100644 tests/ui/deriving/built-in-proc-macro-scope.stdout create mode 100644 tests/ui/deriving/proc-macro-attribute-mixing.rs create mode 100644 tests/ui/deriving/proc-macro-attribute-mixing.stdout diff --git a/compiler/rustc_feature/src/builtin_attrs.rs b/compiler/rustc_feature/src/builtin_attrs.rs index 72ea55d5999a2..bb0e989bd812a 100644 --- a/compiler/rustc_feature/src/builtin_attrs.rs +++ b/compiler/rustc_feature/src/builtin_attrs.rs @@ -578,12 +578,6 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ EncodeCrossCrate::No, coroutines, experimental!(coroutines) ), - // `#[pointee]` attribute to designate the pointee type in SmartPointer derive-macro - gated!( - pointee, Normal, template!(Word), ErrorFollowing, - EncodeCrossCrate::No, derive_smart_pointer, experimental!(pointee) - ), - // RFC 3543 // `#[patchable_function_entry(prefix_nops = m, entry_nops = n)]` gated!( diff --git a/library/core/src/marker.rs b/library/core/src/marker.rs index 6a83ec2eb1e0e..374fa086aecb7 100644 --- a/library/core/src/marker.rs +++ b/library/core/src/marker.rs @@ -1060,7 +1060,7 @@ pub trait FnPtr: Copy + Clone { } /// Derive macro generating impls of traits related to smart pointers. -#[rustc_builtin_macro] +#[rustc_builtin_macro(SmartPointer, attributes(pointee))] #[allow_internal_unstable(dispatch_from_dyn, coerce_unsized, unsize)] #[unstable(feature = "derive_smart_pointer", issue = "123430")] pub macro SmartPointer($item:item) { diff --git a/tests/ui/deriving/auxiliary/another-proc-macro.rs b/tests/ui/deriving/auxiliary/another-proc-macro.rs new file mode 100644 index 0000000000000..a05175c9de926 --- /dev/null +++ b/tests/ui/deriving/auxiliary/another-proc-macro.rs @@ -0,0 +1,45 @@ +//@ force-host +//@ no-prefer-dynamic + +#![crate_type = "proc-macro"] +#![feature(proc_macro_quote)] + +extern crate proc_macro; + +use proc_macro::{quote, TokenStream}; + +#[proc_macro_derive(AnotherMacro, attributes(pointee))] +pub fn derive(_input: TokenStream) -> TokenStream { + quote! { + const _: () = { + const ANOTHER_MACRO_DERIVED: () = (); + }; + } + .into() +} + +#[proc_macro_attribute] +pub fn pointee( + _attr: proc_macro::TokenStream, + _item: proc_macro::TokenStream, +) -> proc_macro::TokenStream { + quote! { + const _: () = { + const POINTEE_MACRO_ATTR_DERIVED: () = (); + }; + } + .into() +} + +#[proc_macro_attribute] +pub fn default( + _attr: proc_macro::TokenStream, + _item: proc_macro::TokenStream, +) -> proc_macro::TokenStream { + quote! { + const _: () = { + const DEFAULT_MACRO_ATTR_DERIVED: () = (); + }; + } + .into() +} diff --git a/tests/ui/deriving/built-in-proc-macro-scope.rs b/tests/ui/deriving/built-in-proc-macro-scope.rs new file mode 100644 index 0000000000000..41c95f63b135e --- /dev/null +++ b/tests/ui/deriving/built-in-proc-macro-scope.rs @@ -0,0 +1,25 @@ +//@ check-pass +//@ aux-build: another-proc-macro.rs +//@ compile-flags: -Zunpretty=expanded + +#![feature(derive_smart_pointer)] + +#[macro_use] +extern crate another_proc_macro; + +use another_proc_macro::{pointee, AnotherMacro}; + +#[derive(core::marker::SmartPointer)] +#[repr(transparent)] +pub struct Ptr<'a, #[pointee] T: ?Sized> { + data: &'a mut T, +} + +#[pointee] +fn f() {} + +#[derive(AnotherMacro)] +#[pointee] +struct MyStruct; + +fn main() {} diff --git a/tests/ui/deriving/built-in-proc-macro-scope.stdout b/tests/ui/deriving/built-in-proc-macro-scope.stdout new file mode 100644 index 0000000000000..c649b7a9a574c --- /dev/null +++ b/tests/ui/deriving/built-in-proc-macro-scope.stdout @@ -0,0 +1,43 @@ +#![feature(prelude_import)] +#![no_std] +//@ check-pass +//@ aux-build: another-proc-macro.rs +//@ compile-flags: -Zunpretty=expanded + +#![feature(derive_smart_pointer)] +#[prelude_import] +use ::std::prelude::rust_2015::*; +#[macro_use] +extern crate std; + +#[macro_use] +extern crate another_proc_macro; + +use another_proc_macro::{pointee, AnotherMacro}; + +#[repr(transparent)] +pub struct Ptr<'a, #[pointee] T: ?Sized> { + data: &'a mut T, +} +#[automatically_derived] +impl<'a, T: ?Sized + ::core::marker::Unsize<__S>, __S: ?Sized> + ::core::ops::DispatchFromDyn> for Ptr<'a, T> { +} +#[automatically_derived] +impl<'a, T: ?Sized + ::core::marker::Unsize<__S>, __S: ?Sized> + ::core::ops::CoerceUnsized> for Ptr<'a, T> { +} + + + +const _: () = + { + const POINTEE_MACRO_ATTR_DERIVED: () = (); + }; +#[pointee] +struct MyStruct; +const _: () = + { + const ANOTHER_MACRO_DERIVED: () = (); + }; +fn main() {} diff --git a/tests/ui/deriving/proc-macro-attribute-mixing.rs b/tests/ui/deriving/proc-macro-attribute-mixing.rs new file mode 100644 index 0000000000000..489665ebeb520 --- /dev/null +++ b/tests/ui/deriving/proc-macro-attribute-mixing.rs @@ -0,0 +1,20 @@ +// This test certify that we can mix attribute macros from Rust and external proc-macros. +// For instance, `#[derive(Default)]` uses `#[default]` and `#[derive(SmartPointer)]` uses +// `#[pointee]`. +// The scoping rule should allow the use of the said two attributes when external proc-macros +// are in scope. + +//@ check-pass +//@ aux-build: another-proc-macro.rs +//@ compile-flags: -Zunpretty=expanded + +#![feature(derive_smart_pointer)] + +#[macro_use] +extern crate another_proc_macro; + +#[pointee] +fn f() {} + +#[default] +fn g() {} diff --git a/tests/ui/deriving/proc-macro-attribute-mixing.stdout b/tests/ui/deriving/proc-macro-attribute-mixing.stdout new file mode 100644 index 0000000000000..f314f6efbe2b9 --- /dev/null +++ b/tests/ui/deriving/proc-macro-attribute-mixing.stdout @@ -0,0 +1,30 @@ +#![feature(prelude_import)] +#![no_std] +// This test certify that we can mix attribute macros from Rust and external proc-macros. +// For instance, `#[derive(Default)]` uses `#[default]` and `#[derive(SmartPointer)]` uses +// `#[pointee]`. +// The scoping rule should allow the use of the said two attributes when external proc-macros +// are in scope. + +//@ check-pass +//@ aux-build: another-proc-macro.rs +//@ compile-flags: -Zunpretty=expanded + +#![feature(derive_smart_pointer)] +#[prelude_import] +use ::std::prelude::rust_2015::*; +#[macro_use] +extern crate std; + +#[macro_use] +extern crate another_proc_macro; + + +const _: () = + { + const POINTEE_MACRO_ATTR_DERIVED: () = (); + }; +const _: () = + { + const DEFAULT_MACRO_ATTR_DERIVED: () = (); + }; diff --git a/tests/ui/feature-gates/feature-gate-derive-smart-pointer.rs b/tests/ui/feature-gates/feature-gate-derive-smart-pointer.rs index 3257a9ca624ba..7b4764ee768ab 100644 --- a/tests/ui/feature-gates/feature-gate-derive-smart-pointer.rs +++ b/tests/ui/feature-gates/feature-gate-derive-smart-pointer.rs @@ -3,7 +3,6 @@ use std::marker::SmartPointer; //~ ERROR use of unstable library feature 'derive #[derive(SmartPointer)] //~ ERROR use of unstable library feature 'derive_smart_pointer' #[repr(transparent)] struct MyPointer<'a, #[pointee] T: ?Sized> { - //~^ ERROR the `#[pointee]` attribute is an experimental feature ptr: &'a T, } diff --git a/tests/ui/feature-gates/feature-gate-derive-smart-pointer.stderr b/tests/ui/feature-gates/feature-gate-derive-smart-pointer.stderr index 19501939dc5be..ea4d1271b7c87 100644 --- a/tests/ui/feature-gates/feature-gate-derive-smart-pointer.stderr +++ b/tests/ui/feature-gates/feature-gate-derive-smart-pointer.stderr @@ -8,16 +8,6 @@ LL | #[derive(SmartPointer)] = help: add `#![feature(derive_smart_pointer)]` to the crate attributes to enable = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date -error[E0658]: the `#[pointee]` attribute is an experimental feature - --> $DIR/feature-gate-derive-smart-pointer.rs:5:22 - | -LL | struct MyPointer<'a, #[pointee] T: ?Sized> { - | ^^^^^^^^^^ - | - = note: see issue #123430 for more information - = help: add `#![feature(derive_smart_pointer)]` to the crate attributes to enable - = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date - error[E0658]: use of unstable library feature 'derive_smart_pointer' --> $DIR/feature-gate-derive-smart-pointer.rs:1:5 | @@ -28,6 +18,6 @@ LL | use std::marker::SmartPointer; = help: add `#![feature(derive_smart_pointer)]` to the crate attributes to enable = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date -error: aborting due to 3 previous errors +error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0658`.