From bed9d1fb7d9d19e985bc8a6ef2d82804f3d2e49a Mon Sep 17 00:00:00 2001 From: Oli Scherer Date: Thu, 7 Mar 2024 21:40:11 +0000 Subject: [PATCH] Add known-bug tests for `derive(PartialEq)` mismatches with `#[repr(packed)]` attributes that are not visible before macro expansion --- .../auxiliary/proc_macro_generate_packed.rs | 27 +++++++++++++++++++ .../multiple_definitions_attribute_merging.rs | 19 +++++++++++++ ...tiple_definitions_attribute_merging.stderr | 26 ++++++++++++++++++ .../ui/resolve/proc_macro_generated_packed.rs | 20 ++++++++++++++ .../proc_macro_generated_packed.stderr | 16 +++++++++++ 5 files changed, 108 insertions(+) create mode 100644 tests/ui/resolve/auxiliary/proc_macro_generate_packed.rs create mode 100644 tests/ui/resolve/multiple_definitions_attribute_merging.rs create mode 100644 tests/ui/resolve/multiple_definitions_attribute_merging.stderr create mode 100644 tests/ui/resolve/proc_macro_generated_packed.rs create mode 100644 tests/ui/resolve/proc_macro_generated_packed.stderr diff --git a/tests/ui/resolve/auxiliary/proc_macro_generate_packed.rs b/tests/ui/resolve/auxiliary/proc_macro_generate_packed.rs new file mode 100644 index 00000000000..c0b24706dcb --- /dev/null +++ b/tests/ui/resolve/auxiliary/proc_macro_generate_packed.rs @@ -0,0 +1,27 @@ +//@ force-host +//@ no-prefer-dynamic +//@ compile-flags: --crate-type proc-macro + +extern crate proc_macro; + +use proc_macro::*; + +#[proc_macro_attribute] +pub fn proc_macro_attribute_that_generates_repr_packed( + _attr: TokenStream, + item: TokenStream, +) -> TokenStream { + let repr = vec![TokenTree::Ident(Ident::new("packed", Span::call_site()))].into_iter(); + let attr = vec![ + TokenTree::Ident(Ident::new("repr", Span::call_site())), + TokenTree::Group(Group::new(Delimiter::Parenthesis, repr.collect())), + ] + .into_iter(); + vec![ + TokenTree::Punct(Punct::new('#', Spacing::Alone)), + TokenTree::Group(Group::new(Delimiter::Bracket, attr.collect())), + ] + .into_iter() + .chain(item) + .collect() +} diff --git a/tests/ui/resolve/multiple_definitions_attribute_merging.rs b/tests/ui/resolve/multiple_definitions_attribute_merging.rs new file mode 100644 index 00000000000..523717861e1 --- /dev/null +++ b/tests/ui/resolve/multiple_definitions_attribute_merging.rs @@ -0,0 +1,19 @@ +//! This test ICEs because the `repr(packed)` attributes +//! end up on the `Dealigned` struct's attribute list, but the +//! derive didn't see that. + +//@known-bug: #120873 +//@ failure-status: 101 +//@ normalize-stderr-test "note: .*\n\n" -> "" +//@ normalize-stderr-test "thread 'rustc' panicked.*\n" -> "" +//@ normalize-stderr-test "(error: internal compiler error: [^:]+):\d+:\d+: " -> "$1:LL:CC: " +//@ rustc-env:RUST_BACKTRACE=0 + +#[repr(packed)] +struct Dealigned(u8, T); + +#[derive(PartialEq)] +#[repr(C)] +struct Dealigned(u8, T); + +fn main() {} diff --git a/tests/ui/resolve/multiple_definitions_attribute_merging.stderr b/tests/ui/resolve/multiple_definitions_attribute_merging.stderr new file mode 100644 index 00000000000..b2d20af883a --- /dev/null +++ b/tests/ui/resolve/multiple_definitions_attribute_merging.stderr @@ -0,0 +1,26 @@ +error[E0428]: the name `Dealigned` is defined multiple times + --> $DIR/multiple_definitions_attribute_merging.rs:17:1 + | +LL | struct Dealigned(u8, T); + | --------------------------- previous definition of the type `Dealigned` here +... +LL | struct Dealigned(u8, T); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ `Dealigned` redefined here + | + = error: internal compiler error: compiler/rustc_mir_transform/src/check_packed_ref.rs:LL:CC: builtin derive created an unaligned reference + --> $DIR/multiple_definitions_attribute_merging.rs:17:25 + | +LL | #[derive(PartialEq)] + | --------- in this derive macro expansion +LL | #[repr(C)] +LL | struct Dealigned(u8, T); + | ^ + | + = Box +query stack during panic: +#0 [mir_const] preparing `::eq` for borrow checking +#1 [mir_promoted] promoting constants in MIR for `::eq` +end of query stack +error: aborting due to 2 previous errors + +For more information about this error, try `rustc --explain E0428`. diff --git a/tests/ui/resolve/proc_macro_generated_packed.rs b/tests/ui/resolve/proc_macro_generated_packed.rs new file mode 100644 index 00000000000..34a7e4db603 --- /dev/null +++ b/tests/ui/resolve/proc_macro_generated_packed.rs @@ -0,0 +1,20 @@ +//! This test ICEs because the `repr(packed)` attribute +//! was generated by a proc macro, so `#[derive]` didn't see it. + +//@aux-build: proc_macro_generate_packed.rs +//@known-bug: #120873 +//@ failure-status: 101 +//@ normalize-stderr-test "note: .*\n\n" -> "" +//@ normalize-stderr-test "thread 'rustc' panicked.*\n" -> "" +//@ normalize-stderr-test "(error: internal compiler error: [^:]+):\d+:\d+: " -> "$1:LL:CC: " +//@ rustc-env:RUST_BACKTRACE=0 + +extern crate proc_macro_generate_packed; +use proc_macro_generate_packed::proc_macro_attribute_that_generates_repr_packed; + +#[derive(PartialEq)] +#[repr(C)] +#[proc_macro_attribute_that_generates_repr_packed] +struct Dealigned(u8, T); + +fn main() {} diff --git a/tests/ui/resolve/proc_macro_generated_packed.stderr b/tests/ui/resolve/proc_macro_generated_packed.stderr new file mode 100644 index 00000000000..507e5867c90 --- /dev/null +++ b/tests/ui/resolve/proc_macro_generated_packed.stderr @@ -0,0 +1,16 @@ +error: internal compiler error: compiler/rustc_mir_transform/src/check_packed_ref.rs:LL:CC: builtin derive created an unaligned reference + --> $DIR/proc_macro_generated_packed.rs:18:25 + | +LL | #[derive(PartialEq)] + | --------- in this derive macro expansion +... +LL | struct Dealigned(u8, T); + | ^ + | + = Box +query stack during panic: +#0 [mir_const] preparing `::eq` for borrow checking +#1 [mir_promoted] promoting constants in MIR for `::eq` +end of query stack +error: aborting due to 1 previous error +