Remove `Nonterminal` and `TokenKind::Interpolated` #124141

nnethercote · 2024-04-18T23:28:21Z

A third attempt at this; the first attempt was #96724 and the second was #114647.

rustbot · 2024-04-18T23:28:25Z

Some changes occurred in src/tools/rustfmt

cc @rust-lang/rustfmt

ijackson · 2024-05-10T15:28:11Z

❤️ @nnethercote for working on this. Thank you! I'm not sure if there's a way for me to help, as someone who doesn't really know much about the compiler innards, but please LMK if you think of something.

nnethercote · 2024-05-10T20:45:22Z

@ijackson: thanks! I'm curious why you are interested in this change, given that it's a compiler internals rearrangement?

nnethercote · 2024-05-10T20:47:31Z

@ijackson: Oh, I see, you are interested in #67062 being fixed. Unfortunately my current thoughts are that this PR alone won't be enough to fix that issue, though it's a necessary stepping stone.

ijackson · 2024-05-10T22:40:41Z

@ijackson: Oh, I see, you are interested in #67062 being fixed. Unfortunately my current thoughts are that this PR alone won't be enough to fix that issue, though it's a necessary stepping stone.

Right. It seems ... quite nontrivial. So, thanks.

dev-ardi · 2024-05-12T21:49:53Z

After this is done TokenKind will become Copy right?

nnethercote · 2024-05-12T22:35:11Z

After this is done TokenKind will become Copy right?

Yes.

Instead of using AST pretty printing. This is a step towards removing `token::Interpolated`, which will eventually (in rust-lang#124141) be replaced with a token stream within invisible delimiters. This changes (improves) the output of the `stringify!` macro in some cases. This is allowed. As the `stringify!` docs say: "Note that the expanded results of the input tokens may change in the future. You should be careful if you rely on the output." Test changes: - tests/ui/macros/stringify.rs: this used to test both token stream pretty printing and AST pretty printing via different ways of invoking of `stringify!` (i.e. `$expr` vs `$tt`). But those two different invocations now give the same result, which is a nice consistency improvement. This removes the need for the `c2!` macro. - tests/ui/macros/trace_faulty_macros.rs: there is some sub-optimal spacing in the printing of `A { a : a, b : 0, c : _, .. }`, which will be fixed in the next commit. The spacing of `1+1` improves -- it now matches the formatting in the source code. - tests/ui/proc-macro/*: minor improvements where small differences between `INPUT (DISPLAY)` output and `DEEP-RE-COLLECTED (DISPLAY)` output disappear.

…, r=<try> Print `token::Interpolated` with token stream pretty printing. This is a step towards removing `token::Interpolated` (rust-lang#124141). It unavoidably changes the output of the `stringify!` macro, generally for the better. r? `@petrochenkov`

nnethercote · 2024-05-17T06:47:27Z

#125174 carves off a piece of this PR so it can be merged separately.

bors · 2024-05-18T00:46:59Z

☔ The latest upstream changes (presumably #123865) made this pull request unmergeable. Please resolve the merge conflicts.

Add tests for `-Zunpretty=expanded` ported from stringify's tests This PR adds a new set of tests for the AST pretty-printer. Previously, pretty-printer edge cases were tested by way of `stringify!` in [tests/ui/macros/stringify.rs](https://github.com/rust-lang/rust/blob/1.78.0/tests/ui/macros/stringify.rs), such as the tests added by rust-lang@419b269 and rust-lang@527e2ea. Those tests will no longer provide effective coverage of the AST pretty-printer after rust-lang#124141. `Nonterminal` and `TokenKind::Interpolated` are being removed, and a consequence is that `stringify!` will perform token stream pretty printing, instead of AST pretty printing, in all of the `stringify!` cases including $:expr and all other interpolations. This PR adds 2 new ui tests with `compile-flags: -Zunpretty=expanded`: - **tests/ui/unpretty/expanded-exhaustive.rs** — this test aims for exhaustive coverage of all the variants of `ExprKind`, `ItemKind`, `PatKind`, `StmtKind`, `TyKind`, and `VisibilityKind`. Some parts could use being fleshed out further, but the current state is roughly on par with what exists in the old stringify-based tests. - **tests/ui/unpretty/expanded-interpolation.rs** — this test covers tricky macro metavariable edge cases that require the AST pretty printer to synthesize parentheses in order for the printed code to be valid Rust syntax. r? `@nnethercote`

Rollup merge of rust-lang#125236 - dtolnay:expandtest, r=nnethercote Add tests for `-Zunpretty=expanded` ported from stringify's tests This PR adds a new set of tests for the AST pretty-printer. Previously, pretty-printer edge cases were tested by way of `stringify!` in [tests/ui/macros/stringify.rs](https://github.com/rust-lang/rust/blob/1.78.0/tests/ui/macros/stringify.rs), such as the tests added by rust-lang@419b269 and rust-lang@527e2ea. Those tests will no longer provide effective coverage of the AST pretty-printer after rust-lang#124141. `Nonterminal` and `TokenKind::Interpolated` are being removed, and a consequence is that `stringify!` will perform token stream pretty printing, instead of AST pretty printing, in all of the `stringify!` cases including $:expr and all other interpolations. This PR adds 2 new ui tests with `compile-flags: -Zunpretty=expanded`: - **tests/ui/unpretty/expanded-exhaustive.rs** — this test aims for exhaustive coverage of all the variants of `ExprKind`, `ItemKind`, `PatKind`, `StmtKind`, `TyKind`, and `VisibilityKind`. Some parts could use being fleshed out further, but the current state is roughly on par with what exists in the old stringify-based tests. - **tests/ui/unpretty/expanded-interpolation.rs** — this test covers tricky macro metavariable edge cases that require the AST pretty printer to synthesize parentheses in order for the printed code to be valid Rust syntax. r? `@nnethercote`

Instead of using AST pretty printing. This is a step towards removing `token::Interpolated`, which will eventually (in rust-lang#124141) be replaced with a token stream within invisible delimiters. This changes (improves) the output of the `stringify!` macro in some cases. This is allowed. As the `stringify!` docs say: "Note that the expanded results of the input tokens may change in the future. You should be careful if you rely on the output." Test changes: - tests/ui/macros/stringify.rs: this used to test both token stream pretty printing and AST pretty printing via different ways of invoking of `stringify!` (i.e. `$expr` vs `$tt`). But those two different invocations now give the same result, which is a nice consistency improvement. This removes the need for all the `c2*` macros. The AST pretty printer now has more thorough testing thanks to rust-lang#125236. - tests/ui/proc-macro/*: minor improvements where small differences between `INPUT (DISPLAY)` output and `DEEP-RE-COLLECTED (DISPLAY)` output disappear.

petrochenkov · 2024-05-23T20:01:24Z

It's great to see that enum InvisibleOrigin allows to migrate the parser to delimited groups relatively simply, with just the maybe_whole to maybe_reparse_metavar_seq replacement.

Of course it prevents a lot of interesting stuff like reparsing expr as pat and similar, like it would work in a purely token-based model, but all that can be carefully introduced later, when it's possible to do backward compatibly.

petrochenkov · 2024-05-23T20:02:23Z

How hard would it be to get this to a perf run?
(With or without the NtExpr/NtLiteral stuff.)

petrochenkov · 2024-05-23T20:03:04Z

Blocked on #125174.
@rustbot blocked

…<try> rust-lang#124141 preliminaries Preliminary changes required to start removing `Nonterminal`. r? `@petrochenkov`

bors · 2024-11-10T08:32:51Z

☔ The latest upstream changes (presumably #132831) made this pull request unmergeable. Please resolve the merge conflicts.

It was added in rust-lang#130349, but it's not used meaningfully, and causes difficulties for Nonterminal removal in rust-lang#124141.

…petrochenkov rust-lang#124141 preliminaries Preliminary changes required to start removing `Nonterminal` (rust-lang#124141). r? `@petrochenkov`

It was added in rust-lang#130349, but it's not used meaningfully, and causes difficulties for Nonterminal removal in rust-lang#124141.

We now use invisible delimiters for expanded `vis` fragments, instead of `Token::Interpolated`.

Notes about tests: - tests/ui/parser/macro/trait-object-macro-matcher.rs: the syntax error is duplicated, because it occurs now when parsing the decl macro input, and also when parsing the expanded decl macro. But this won't show up for normal users due to error de-duplication. - tests/ui/associated-consts/issue-93835.rs: ditto. - The changes to metavariable descriptions in this PR's earlier commits are now visible in error message for several tests.

The one notable test change is `tests/ui/macros/trace_faulty_macros.rs`. This commit removes the complicated `Interpolated` handling in `expected_expression_found` that results in a longer error message. But I think the new, shorter message is actually an improvement. The original complaint was in rust-lang#71039, when the error message started with "error: expected expression, found `1 + 1`". That was confusing because `1 + 1` is an expression. Other than that, the reporter said "the whole error message is not too bad if you ignore the first line". Subsequently, extra complexity and wording was added to the error message. But I don't think the extra wording actually helps all that much. In particular, it still says of the `1+1` that "this is expected to be expression". This repeats the problem from the original complaint! This commit removes the extra complexity, reverting to a simpler error message. This is primarily because the traversal is a pain without `Interpolated` tokens. Nonetheless, I think the error message is *improved*. It now starts with "expected expression, found `pat` metavariable", which is much clearer and the real problem. It also doesn't say anything specific about `1+1`, which is good, because the `1+1` isn't really relevant to the error -- it's the `$e:pat` that's important.

This involves replacing `nt_pretty_printing_compatibility_hack` with `stream_pretty_printing_compatibility_hack`. The handling of statements in `transcribe` is slightly different to other nonterminal kinds, due to the lack of `from_ast` implementation for empty statements. Notable test changes: - `tests/ui/proc-macro/expand-to-derive.rs`: the diff looks large but the only difference is the insertion of a single invisible-delimited group around a metavar.

This time when converting them to proc-macro `Group` form.

Note: there was an existing code path involving `Interpolated` in `MetaItem::from_tokens` that was dead. This commit transfers that to the new form, but puts an `unreachable!` call inside it.

Notes about tests: - tests/ui/rfcs/rfc-2294-if-let-guard/feature-gate.rs: some messages are now duplicated due to repeated parsing. - tests/ui/rfcs/rfc-2497-if-let-chains/disallowed-positions.rs: ditto. - `tests/ui/proc-macro/macro-rules-derive-cfg.rs`: the diff looks large but the only difference is the insertion of a single invisible-delimited group around a metavar.

`NtBlock` is the last remaining variant of `Nonterminal`, so once it is gone then `Nonterminal` can be removed as well.

They are no longer needed. This does slightly worsen the error message for a single test, but that test contains code that is so badly broken that I'm not worried about it.

rust-log-analyzer · 2024-11-25T06:10:35Z

The job x86_64-gnu-llvm-18 failed! Check out the build log: (web) (plain)

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#17 exporting to docker image format
#17 sending tarball 31.1s done
#17 DONE 36.8s
##[endgroup]
Setting extra environment values for docker:  --env ENABLE_GCC_CODEGEN=1 --env GCC_EXEC_PREFIX=/usr/lib/gcc/
[CI_JOB_NAME=x86_64-gnu-llvm-18]
debug: `DISABLE_CI_RUSTC_IF_INCOMPATIBLE` configured.
---
sccache: Starting the server...
##[group]Configure the build
configure: processing command line
configure: 
configure: build.configure-args := ['--build=x86_64-unknown-linux-gnu', '--llvm-root=/usr/lib/llvm-18', '--enable-llvm-link-shared', '--set', 'rust.randomize-layout=true', '--set', 'rust.thin-lto-import-instr-limit=10', '--enable-verbose-configure', '--enable-sccache', '--disable-manage-submodules', '--enable-locked-deps', '--enable-cargo-native-static', '--set', 'rust.codegen-units-std=1', '--set', 'dist.compression-profile=balanced', '--dist-compression-formats=xz', '--set', 'rust.lld=false', '--disable-dist-src', '--release-channel=nightly', '--enable-debug-assertions', '--enable-overflow-checks', '--enable-llvm-assertions', '--set', 'rust.verify-llvm-ir', '--set', 'rust.codegen-backends=llvm,cranelift,gcc', '--set', 'llvm.static-libstdcpp', '--enable-new-symbol-mangling']
configure: target.x86_64-unknown-linux-gnu.llvm-config := /usr/lib/llvm-18/bin/llvm-config
configure: llvm.link-shared     := True
configure: rust.randomize-layout := True
configure: rust.thin-lto-import-instr-limit := 10
---
  Downloaded boml v0.3.1
   Compiling boml v0.3.1
   Compiling y v0.1.0 (/checkout/compiler/rustc_codegen_gcc/build_system)
    Finished `release` profile [optimized] target(s) in 4.01s
     Running `/checkout/obj/build/x86_64-unknown-linux-gnu/stage1-codegen/x86_64-unknown-linux-gnu/release/y test --use-system-gcc --use-backend gcc --out-dir /checkout/obj/build/x86_64-unknown-linux-gnu/stage1-tools/cg_gcc --release --mini-tests --std-tests`
Using system GCC
[BUILD] example
[AOT] mini_core_hello_world
/checkout/obj/build/x86_64-unknown-linux-gnu/stage1-tools/cg_gcc/mini_core_hello_world
abc
---
   Compiling core v0.0.0 (/checkout/library/core)
error: no rules expected `literal` metavariable
   --> /checkout/library/stdarch/crates/std_detect/src/detect/macros.rs:54:91
    |
51  | /         macro_rules! $macro_name {
53  | |                 ($feature_lit) => {
53  | |                 ($feature_lit) => {
54  | |                     $crate::detect_feature!($feature, $feature_lit $(, without cfg check: $feature_cfg_check)? $(: $($target_feature_lit)...
    | |                                                                                           ^^^^^^^^^^^^^^^^^^ no rules expected this token in macro call
88  | |             };
89  | |         }
    | |_________- in this expansion of `is_x86_feature_detected!`
    |
    |
   ::: std/tests/run-time-detect.rs:145:27
    |
145 |       println!("tsc: {:?}", is_x86_feature_detected!("tsc"));
    |
note: while trying to match keyword `true`
   --> /checkout/library/stdarch/crates/std_detect/src/detect/macros.rs:12:55
    |
    |
12  |     ($feature:tt, $feature_lit:tt, without cfg check: true) => {
    |                                                       ^^^^
    = note: captured metavariables except for `:tt`, `:ident` and `:lifetime` cannot be compared to other tokens
    = note: see <https://doc.rust-lang.org/nightly/reference/macros-by-example.html#forwarding-a-matched-fragment> for more information
error: no rules expected `literal` metavariable
   --> /checkout/library/stdarch/crates/std_detect/src/detect/macros.rs:54:91
    |
    |
51  | /         macro_rules! $macro_name {
53  | |                 ($feature_lit) => {
53  | |                 ($feature_lit) => {
54  | |                     $crate::detect_feature!($feature, $feature_lit $(, without cfg check: $feature_cfg_check)? $(: $($target_feature_lit)...
    | |                                                                                           ^^^^^^^^^^^^^^^^^^ no rules expected this token in macro call
88  | |             };
89  | |         }
    | |_________- in this expansion of `is_x86_feature_detected!`
    |
    |
   ::: std/tests/run-time-detect.rs:144:27
    |
144 |       println!("mmx: {:?}", is_x86_feature_detected!("mmx"));
    |
note: while trying to match keyword `true`
   --> /checkout/library/stdarch/crates/std_detect/src/detect/macros.rs:12:55
    |
    |
12  |     ($feature:tt, $feature_lit:tt, without cfg check: true) => {
    |                                                       ^^^^
    = note: captured metavariables except for `:tt`, `:ident` and `:lifetime` cannot be compared to other tokens
    = note: see <https://doc.rust-lang.org/nightly/reference/macros-by-example.html#forwarding-a-matched-fragment> for more information
error: could not compile `std` (test "run-time-detect") due to 2 previous errors
warning: build failed, waiting for other jobs to finish...
Build completed unsuccessfully in 0:26:54
  local time: Mon Nov 25 06:10:25 UTC 2024

@cfg

The first rule of the `features` macro looks like this: ``` macro_rules! features { ( @target: $target:ident; @cfg: $cfg:meta; @MACRO_NAME: $macro_name:ident; @MACRO_ATTRS: $(#[$macro_attrs:meta])* $(@BIND_FEATURE_NAME: $bind_feature:tt; $feature_impl:tt; $(#[$deprecate_attr:meta];)?)* $(@NO_RUNTIME_DETECTION: $nort_feature:tt; )* $(@feature: #[$stability_attr:meta] $feature:ident: $feature_lit:tt; $(without cfg check: $feature_cfg_check:literal;)? $(implied by target_features: [$($target_feature_lit:tt),*];)? $(#[$feature_comment:meta])*)* ) => { ``` Notice all the `tt` specifiers. They are used because they are forwarded to another macro. Only `ident`, `lifetime`, and `tt` specifiers can be forwarded this way. But there is an exception: `$feature_lit:tt`, which was added recently. In theory it should cause an error like this: ``` error: no rules expected `literal` metavariable --> /home/njn/dev/rust3/library/stdarch/crates/std_detect/src/detect/macros.rs:54:91 | 51 | / macro_rules! $macro_name { 52 | | $( 53 | | ($feature_lit) => { 54 | | $crate::detect_feature!($feature, $feature_lit $(, without cfg check: $feature_cfg_check)? ... | | ^^^^^^^^^^^^^^^^^^ no rules expected this token in macro call ... | 88 | | }; 89 | | } | |_________- in this expansion of `is_x86_feature_detected!` | ::: std/tests/run-time-detect.rs:145:27 | 145 | println!("tsc: {:?}", is_x86_feature_detected!("tsc")); | ------------------------------- in this macro invocation | note: while trying to match keyword `true` --> /home/njn/dev/rust3/library/stdarch/crates/std_detect/src/detect/macros.rs:12:55 | 12 | ($feature:tt, $feature_lit:tt, without cfg check: true) => { | ^^^^ = note: captured metavariables except for `:tt`, `:ident` and `:lifetime` cannot be compared to other tokens = note: see <https://doc.rust-lang.org/nightly/reference/macros-by-example.html#forwarding-a-matched-fragment> for more information ``` (The URL at the end of the error has more details about this forwarding limitation.) In practice it doesn't cause this error. I'm not sure why, but the existing macro implementation in rustc is far from perfect, so it's believable that it does the wrong thing here. Why does this matter? Because rust-lang/rust#124141 is modifying the macro implementation, and when that PR is applied the error *does* occur. (It's one of several cases I have found where the existing compiler accepts code it shouldn't, but #124141 causes that code to be rejected.) Fortunately the fix is simple: replace the `literal` specifier with `tt`.

nnethercote · 2024-11-25T08:09:33Z

This CI failure:

error: no rules expected `literal` metavariable
   --> /checkout/library/stdarch/crates/std_detect/src/detect/macros.rs:54:91
    |
51  | /         macro_rules! $macro_name {
53  | |                 ($feature_lit) => {
53  | |                 ($feature_lit) => {
54  | |                     $crate::detect_feature!($feature, $feature_lit $(, without cfg check: $feature_cfg_check)? $(: $($target_feature_lit)...
    | |                                                                                           ^^^^^^^^^^^^^^^^^^ no rules expected this token in macro call
88  | |             };
89  | |         }
    | |_________- in this expansion of `is_x86_feature_detected!`

is due to a new issue in stdarch. There is some code in stdarch that the current compiler accepts but shouldn't, and this PR causes it to fail to compile. Details in rust-lang/stdarch#1680.

Remove `NtVis` and `NtTy` The next part of rust-lang#124141. The first actual remove of `Nonterminal` variants. `NtVis` is a simple case that doesn't get much use, but `NtTy` is more complex. r? `@petrochenkov`

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Apr 18, 2024

nnethercote marked this pull request as draft April 18, 2024 23:28

nnethercote mentioned this pull request Apr 18, 2024

Start removing Nonterminal #114647

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nnethercote force-pushed the rm-Nonterminal-and-TokenKind-Interpolated branch 2 times, most recently from 42a623a to c133e16 Compare April 23, 2024 03:51

petrochenkov self-assigned this Apr 28, 2024

nnethercote force-pushed the rm-Nonterminal-and-TokenKind-Interpolated branch from c133e16 to 7aef5db Compare May 16, 2024 10:50

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nnethercote mentioned this pull request May 17, 2024

Print token::Interpolated with token stream pretty printing. #125174

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dtolnay mentioned this pull request May 18, 2024

Add tests for -Zunpretty=expanded ported from stringify's tests #125236

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rustbot removed the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label May 23, 2024

bors added a commit to rust-lang-ci/rust that referenced this pull request Nov 5, 2024

Auto merge of rust-lang#132629 - nnethercote:124141-preliminaries, r=…

feea15e

…<try> rust-lang#124141 preliminaries Preliminary changes required to start removing `Nonterminal`. r? `@petrochenkov`

petrochenkov mentioned this pull request Nov 9, 2024

#124141 preliminaries #132629

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nnethercote force-pushed the rm-Nonterminal-and-TokenKind-Interpolated branch from 9dfb022 to 313dbcd Compare November 13, 2024 04:20

nnethercote added 12 commits November 25, 2024 10:40

Remove NtVis.

4c098db

We now use invisible delimiters for expanded `vis` fragments, instead of `Token::Interpolated`.

More denesting of invisibly-delimited groups.

d4fbe1f

This time when converting them to proc-macro `Group` form.

Remove NtMeta.

f5acfd7

Note: there was an existing code path involving `Interpolated` in `MetaItem::from_tokens` that was dead. This commit transfers that to the new form, but puts an `unreachable!` call inside it.

Remove NtPath.

6af929b

Fix a problem with metavars and inner attributes.

febfb8d

Remove NtBlock, Nonterminal, and TokenKind::Interpolated.

0a3c9b5

`NtBlock` is the last remaining variant of `Nonterminal`, so once it is gone then `Nonterminal` can be removed as well.

Impl Copy for Token and TokenKind.

db50c0f

Remove TokenStream::flattened and InvisibleOrigin::FlattenToken.

2479f6c

They are no longer needed. This does slightly worsen the error message for a single test, but that test contains code that is so badly broken that I'm not worried about it.

nnethercote force-pushed the rm-Nonterminal-and-TokenKind-Interpolated branch from 313dbcd to 2479f6c Compare November 25, 2024 05:39

nnethercote mentioned this pull request Nov 25, 2024

Remove NtVis and NtTy #133436

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nnethercote mentioned this pull request Nov 25, 2024

Fix the features macro. rust-lang/stdarch#1680

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Remove `Nonterminal` and `TokenKind::Interpolated` #124141

Remove `Nonterminal` and `TokenKind::Interpolated` #124141

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Remove Nonterminal and TokenKind::Interpolated #124141

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Remove `Nonterminal` and `TokenKind::Interpolated` #124141

Remove `Nonterminal` and `TokenKind::Interpolated` #124141

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