Begin to abstract `rustc_type_ir` for rust-analyzer #116828

compiler-errors · 2023-10-17T00:41:50Z

This adds the "nightly" feature which is used by the compiler, and falls back to more simple implementations when that is not active.

r? @lcnr or @jackh726

compiler/rustc_type_ir/src/index.rs

compiler-errors · 2023-10-17T00:48:21Z

@bors try @rust-timer queue

the debug formatting changed to use the non-convenience functions -- shouldn't affect perf but weirder things have happened

bors · 2023-10-17T00:49:29Z

⌛ Trying commit 6f43680 with merge 26d6e91...

…e_ir, r=<try> Begin to abstract `rustc_type_ir` for rust-analyzer Not totally happy with this yet, but if the new trait solver is ever to be used by external users, we need to make rustc-type-ir build without internal deps. This adds the "nightly" feature which is used by the compiler, and falls back to more simple implementations when that is not active. r? `@lcnr` or `@jackh726` -- happy to block this pr on a discussion about design and long-term direction for rustc-type-ir tho

bors · 2023-10-17T02:09:58Z

☀️ Try build successful - checks-actions
Build commit: 26d6e91 (26d6e91c6bb9c044b86d4d74f56fc8029a907b85)

rust-timer · 2023-10-17T11:09:13Z

Finished benchmarking commit (26d6e91): comparison URL.

Overall result: no relevant changes - no action needed

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR may lead to changes in compiler perf.

@bors rollup=never
@rustbot label: -S-waiting-on-perf -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	2.0%	[2.0%, 2.0%]	1
Improvements ✅ (primary)	-1.4%	[-1.4%, -1.4%]	1
Improvements ✅ (secondary)	-1.3%	[-1.3%, -1.3%]	1
All ❌✅ (primary)	-1.4%	[-1.4%, -1.4%]	1

Cycles

This benchmark run did not return any relevant results for this metric.

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 627.292s -> 625.722s (-0.25%)
Artifact size: 305.57 MiB -> 305.62 MiB (0.01%)

jackh726 · 2023-10-17T14:07:58Z

Let's schedule some time to discuss this? I think some of these are okay to do short-term, but I'd like to have some idea of what we want long-term.

WaffleLapkin · 2023-10-17T07:55:27Z

compiler/rustc_type_ir/src/fold.rs

+type Never = !;
+
+#[cfg(not(feature = "nightly"))]
+type Never = std::convert::Infallible;


Half serious: you could just use <fn() -> !>::Output

Seems to have problems with type inference later on in the crate:'

error[E0284]: type annotations needed --> compiler/rustc_type_ir/src/fold.rs:223:18 | 223 | type Error = Never; | ^^^^^ cannot infer type | = note: cannot satisfy `<F as FallibleTypeFolder<I>>::Error == _`

So the MRE is this: (play).

FallibleTypeFolder<Error = Never> from TypeFolder super-traits gets checked against type Error = Never in the blanket impl of FallibleTypeFolder for F: TypeFolder.

First of all, are cycles like this even allowed? I.e. can you satisfy a super-trait bound by a blanket impl that asks for the same trait? I would think that this causes a cycle...

Second of all, can't we just remove the super trait? It seems like all the things that can be proven with the supertrait bound can be proven via the blanket impl (that might be wrong, not sure).

Lastly, why the compiler can't evaluate this projection here? It seems to be fine in other places, and I don't see what can't it infer...

I don't see why it should cause a cycle... impls (blanket or otherwise) can be provided even where supertraits are not satisfied.

We can't "just" remove the supertrait because the default implementations of the subtrait's provided methods ultimately call into the supertrait — and I don't think the existence of the blanket impl is provable there, within the trait definition.

Okay, so the error arises whenever the associated type doesn't match the supertrait constraint: (play).

Not sure why the compiler is unable to prove that the Never types are equal, though...

compiler/rustc_type_ir/src/fold.rs

compiler/rustc_type_ir/src/index.rs

rustbot · 2023-10-18T21:47:37Z

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

These commits modify the Cargo.lock file. Unintentional changes to Cargo.lock can be introduced when switching branches and rebasing PRs.

If this was unintentional then you should revert the changes before this PR is merged.
Otherwise, you can ignore this comment.

compiler-errors · 2023-10-18T21:48:45Z

Ending up pulling out the newtype macro and applying the changes from #116830, so I'm slightly happier with the changes now.

eggyal · 2023-10-20T11:03:07Z

I'm interested in understanding the long-term direction here too: could you direct me towards any discussion you end up having over this @compiler-errors and @jackh726 ? Thanks!

compiler-errors · 2023-10-20T16:00:38Z

@eggyal: Yeah I haven't had too many conversations about this, but I'll make sure to open a topic on the t-types zulip stream if I do.

bors · 2023-10-20T22:01:00Z

☔ The latest upstream changes (presumably #116951) made this pull request unmergeable. Please resolve the merge conflicts.

bors · 2023-10-24T20:23:59Z

☔ The latest upstream changes (presumably #117126) made this pull request unmergeable. Please resolve the merge conflicts.

compiler-errors · 2023-11-18T00:20:18Z

Would appreciate a review on this, since it's very bitrotty :'(

jackh726

One question - but r=me once you resolve that.

jackh726 · 2023-11-19T22:37:34Z

compiler/rustc_type_ir/src/lib.rs

 #[debug_format = "DebruijnIndex({})"]
+ #[gate_rustc_only]


Wait, am I confused, or does this mean that DebruijnIndex (and UniverseIndex) below are nightly (rustc) only?

If so, why? If there is no reason, this shouldn't be gated.

If not, ignore me :)

No, sorry for the confusion. The attribute just means "emit all the nightly stuff (e.g. Step and Encodable/Decodable) with a cfg(feature = "nightly") so it can be compiled on stable too". Maybe it should be renamed, but can be later.

compiler-errors · 2023-11-19T22:41:48Z

@bors r=jackh726

bors · 2023-11-19T22:41:51Z

📌 Commit 4506681 has been approved by jackh726

It is now in the queue for this repository.

bors · 2023-11-19T22:55:18Z

⌛ Testing commit 4506681 with merge 4f3da90...

bors · 2023-11-20T00:59:57Z

☀️ Test successful - checks-actions
Approved by: jackh726
Pushing 4f3da90 to master...

rust-timer · 2023-11-20T02:22:45Z

Finished benchmarking commit (4f3da90): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	3.6%	[3.6%, 3.6%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Cycles

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.4%	[-2.4%, -2.4%]	1
All ❌✅ (primary)	-	-	0

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 676.7s -> 678.667s (0.29%)
Artifact size: 313.73 MiB -> 313.77 MiB (0.01%)

compiler-errors marked this pull request as ready for review October 17, 2023 00:41

rustbot assigned lcnr Oct 17, 2023

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 Oct 17, 2023

compiler-errors commented Oct 17, 2023

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rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Oct 17, 2023

WaffleLapkin reviewed Oct 17, 2023

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rust-cloud-vms bot force-pushed the nightlyify-rustc_type_ir branch from 6f43680 to 8006369 Compare October 18, 2023 21:47

rust-cloud-vms bot force-pushed the nightlyify-rustc_type_ir branch from 8006369 to 9bae00d Compare October 18, 2023 21:47

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rust-cloud-vms bot force-pushed the nightlyify-rustc_type_ir branch from f331d63 to d627468 Compare October 18, 2023 21:57

rust-cloud-vms bot force-pushed the nightlyify-rustc_type_ir branch from d627468 to 9b2792d Compare October 24, 2023 13:49

Begin nightly-ifying rustc_type_ir

4506681

rust-cloud-vms bot force-pushed the nightlyify-rustc_type_ir branch from 9b2792d to 4506681 Compare November 18, 2023 00:20

jackh726 approved these changes Nov 19, 2023

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bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Nov 19, 2023

bors added the merged-by-bors This PR was explicitly merged by bors. label Nov 20, 2023

bors merged commit 4f3da90 into rust-lang:master Nov 20, 2023
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rustbot added this to the 1.76.0 milestone Nov 20, 2023

bors mentioned this pull request Nov 20, 2023

Uplift CanonicalVarInfo and friends into rustc_type_ir #117582

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compiler-errors deleted the nightlyify-rustc_type_ir branch November 20, 2023 02:31

This was referenced Nov 20, 2023

rust-analyzer shows thousands of rustc errors but running the build command on the terminal works fine rust-lang/rust-analyzer#15942

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Bootstrap sometimes fails to build miri #118129

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jackh726 mentioned this pull request Nov 30, 2023

Tracking issue for shared type library rust-lang/types-team#16

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Begin to abstract `rustc_type_ir` for rust-analyzer #116828

Begin to abstract `rustc_type_ir` for rust-analyzer #116828

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Begin to abstract rustc_type_ir for rust-analyzer #116828

Begin to abstract rustc_type_ir for rust-analyzer #116828

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Begin to abstract `rustc_type_ir` for rust-analyzer #116828

Begin to abstract `rustc_type_ir` for rust-analyzer #116828

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