Properly handle attributes on statements #78296

Aaron1011 · 2020-10-23T17:45:23Z

We now collect tokens for the underlying node wrapped by StmtKind
nstead of storing tokens directly in Stmt.

LazyTokenStream now supports capturing a trailing semicolon after it
is initially constructed. This allows us to avoid refactoring statement
parsing to wrap the parsing of the semicolon in parse_tokens.

Attributes on item statements
(e.g. fn foo() { #[bar] struct MyStruct; }) are now treated as
item attributes, not statement attributes, which is consistent with how
we handle attributes on other kinds of statements. The feature-gating
code is adjusted so that proc-macro attributes are still allowed on item
statements on stable.

Two built-in macros (#[global_allocator] and #[test]) needed to be
adjusted to support being passed Annotatable::Stmt.

rust-highfive · 2020-10-23T17:45:27Z

r? @petrochenkov

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Aaron1011 · 2020-10-23T17:46:11Z

@bors try @rust-timer queue

rust-timer · 2020-10-23T17:46:12Z

Awaiting bors try build completion

bors · 2020-10-23T17:46:23Z

⌛ Trying commit e280124325b5aab5a6723557959dcb734d7bbc01 with merge 548f7f9bf4b5f0cdafe133e9709c0720bdcf303a...

Aaron1011 · 2020-10-23T18:07:04Z

Before this is merged, we'll probably want to reach a decision about whether or not #[allow(doc_comments)] applies to doc comments on the same item: https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/Doc.20comments.20on.20nested.20items

Aaron1011 · 2020-10-23T21:18:09Z

Blocked on #78306

Aaron1011 · 2020-10-25T21:18:08Z

Now blocked on making progress on #61733 (comment).

Aaron1011 · 2020-11-17T23:11:26Z

Any changes regarding #61733 (comment) (e.g. #78991 and #78685) will need to go through a warning period (if not an edition), since they will cause a significant amount of ecosystem breakage. Therefore, any code to support trailing macro statement expressions (or trailing-semicolon `macro_rules~ macros) will need to continue to exist for quite some time.

Fortunately, I think this PR doesn't actually require either of those issues to be resolved.

@petrochenkov: This is now ready for review

Aaron1011 · 2020-11-18T06:03:38Z

@bors try @rust-timer queue

rust-timer · 2020-11-18T06:03:40Z

Awaiting bors try build completion

bors · 2020-11-18T06:03:49Z

⌛ Trying commit ff440127e52e1c9385ea6c81c8c87b93b79de079 with merge 3d7a430081377f37233ad25b70ec193884238670...

bors · 2020-11-27T16:10:03Z

📌 Commit 772292f has been approved by petrochenkov

bors · 2020-11-27T18:58:25Z

⌛ Testing commit 772292f with merge 5d945e4ab94196c12a449771f3fa800840d0976d...

bors · 2020-11-27T19:30:54Z

💔 Test failed - checks-actions

petrochenkov · 2020-11-27T19:33:53Z

 Documenting rustc_ast_passes v0.0.0 (/checkout/compiler/rustc_ast_passes)
error[E0275]: overflow evaluating the requirement `rustc_ast::Local: std::marker::Sync`
  |
  = help: consider adding a `#![recursion_limit="256"]` attribute to your crate (`rustc_ast_passes`)

When cfg(parallel_compiler) is enabled, we end up trying to prove Send/Sync bounds for some deeply nested types (at least when rustdoc is run).

Aaron1011 · 2020-11-27T20:49:05Z

Bumping the recursion limit in that crate was enough to get rustdoc to succeed with cfg(parallel_compiler) enabled.

@bors r=petrochenkov

bors · 2020-11-27T20:49:06Z

📌 Commit 92bfa05 has been approved by petrochenkov

bors · 2020-11-28T07:49:01Z

⌛ Testing commit 92bfa05 with merge 4ae328b...

bors · 2020-11-28T10:07:06Z

☀️ Test successful - checks-actions
Approved by: petrochenkov
Pushing 4ae328b to master...

Remove unnecessary trailing semicolons PR rust-lang/rust#78296 will cause rustc to start warning on semicolons following item statements.

…k, r=petrochenkov Replace pretty-print/compare/retokenize hack with targeted workarounds Based on rust-lang#78296 cc rust-lang#43081 The 'pretty-print/compare/retokenize' hack is used to try to avoid passing an outdated `TokenStream` to a proc-macro when the underlying AST is modified in some way (e.g. cfg-stripping before derives). Unfortunately, retokenizing throws away spans (including hygiene information), which causes issues of its own. Every improvement to the accuracy of the pretty-print/retokenize comparison has resulted in non-trivial ecosystem breakage due to hygiene changes. In extreme cases, users deliberately wrote unhygienic `macro_rules!` macros (likely because they did not realize that the compiler's behavior was a bug). Additionaly, the comparison between the original and pretty-printed/retoknized token streams comes at a non-trivial runtime cost, as shown by rust-lang#79338 This PR removes the pretty-print/compare/retokenize logic from `nt_to_tokenstream`. We only discard the original `TokenStream` under two circumstances: * Inner attributes are used (detected by examining the AST) * `cfg`/`cfg_attr` processing modifies the AST. This is detected by making the visitor update a flag when it performs a modification, instead of trying to detect the modification after-the-fact. Note that a 'matching' `cfg` (e.g. `#[cfg(not(FALSE)]`) does not actually get removed from the AST, allowing us to preserve the original `TokenStream`. In all other cases, we preserve the original `TokenStream`. This could use a bit of refactoring/renaming - opening for a Crater run. r? `@ghost`

Pkgsrc changes: * Adjust patches, re-compute line offsets, fix capitalization. * Remove i686/FreeBSD support, no longer provided upstream. * Bump bootstraps to 1.49.0. * Change USE_TOOLS from bsdtar to gtar. * Reduce diffs to pkgsrc-wip package patches. * Allow rust.BUILD_TARGET to override automatic choice of target. * Add an i586/NetBSD (pentium) bootstrap variant (needs testing), not yet added as bootstrap since 1.49 doesn't have that variant. Upstream changes: Version 1.50.0 (2021-02-11) ============================ Language ----------------------- - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270] This has been technically possible since 1.38.0, as it was unintentionally stabilized. - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068] Compiler ----------------------- - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142] - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484] - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484] \* Refer to Rust's [platform support page][forge-platform-support] for more information on Rust's tiered platform support. Libraries ----------------------- - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636] - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989] - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699] This value cannot be a valid file descriptor, and now means `Option<File>` takes up the same amount of space as `File`. Stabilized APIs --------------- - [`bool::then`] - [`btree_map::Entry::or_insert_with_key`] - [`f32::clamp`] - [`f64::clamp`] - [`hash_map::Entry::or_insert_with_key`] - [`Ord::clamp`] - [`RefCell::take`] - [`slice::fill`] - [`UnsafeCell::get_mut`] The following previously stable methods are now `const`. - [`IpAddr::is_ipv4`] - [`IpAddr::is_ipv6`] - [`Layout::size`] - [`Layout::align`] - [`Layout::from_size_align`] - `pow` for all integer types. - `checked_pow` for all integer types. - `saturating_pow` for all integer types. - `wrapping_pow` for all integer types. - `next_power_of_two` for all unsigned integer types. - `checked_power_of_two` for all unsigned integer types. Cargo ----------------------- - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976] This option sets a wrapper to execute instead of `rustc`, for workspace members only. - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire contents of that directory for changes.][cargo/8973] - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725] Misc ---- - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896] - [Running tests will now print the total time taken to execute.][75752] Compatibility Notes ------------------- - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead. - [Changes in how `TokenStream`s are checked have fixed some cases where you could write unhygenic `macro_rules!` macros.][79472] - [`#![test]` as an inner attribute is now considered unstable like other inner macro attributes, and reports an error by default through the `soft_unstable` lint.][79003] - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864] - [Dropped support for all cloudabi targets.][78439] - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's recommended to use the `#[panic_handler]` attribute to provide your own implementation. - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296] [74989]: rust-lang/rust#74989 [79261]: rust-lang/rust#79261 [79896]: rust-lang/rust#79896 [79484]: rust-lang/rust#79484 [79472]: rust-lang/rust#79472 [79270]: rust-lang/rust#79270 [79003]: rust-lang/rust#79003 [78864]: rust-lang/rust#78864 [78636]: rust-lang/rust#78636 [78439]: rust-lang/rust#78439 [78343]: rust-lang/rust#78343 [78296]: rust-lang/rust#78296 [78068]: rust-lang/rust#78068 [75752]: rust-lang/rust#75752 [74699]: rust-lang/rust#74699 [78142]: rust-lang/rust#78142 [77484]: rust-lang/rust#77484 [cargo/8976]: rust-lang/cargo#8976 [cargo/8973]: rust-lang/cargo#8973 [cargo/8725]: rust-lang/cargo#8725 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then [`btree_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/btree_map/enum.Entry.html#method.or_insert_with_key [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp [`hash_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/hash_map/enum.Entry.html#method.or_insert_with_key [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill

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Fix inconsistencies in handling of inert attributes on statements #78306

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Compiler loses location information before calling macros (sometimes) #43081

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Aaron1011 force-pushed the fix/stmt-tokens branch from e280124 to 73acb50 Compare November 17, 2020 23:05

Aaron1011 changed the title ~~[WIP] Properly handle custom attributes on statements~~ Properly handle attributes on statements Nov 17, 2020

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Aaron1011 force-pushed the fix/stmt-tokens branch from 73acb50 to ff44012 Compare November 18, 2020 03:35

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Replace pretty-print/compare/retokenize hack with targeted workarounds #79472

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Bump recursion_limit in rustc_ast_passes

92bfa05

When cfg(parallel_compiler) is enabled, we end up trying to prove Send/Sync bounds for some deeply nested types (at least when rustdoc is run).

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expand/resolve: Turn #[derive] into a regular macro attribute #79078

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Properly handle attributes on statements #78296

Properly handle attributes on statements #78296

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Properly handle attributes on statements #78296

Properly handle attributes on statements #78296

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