Always evaluate free constants and statics, even if previous errors occurred #121087

oli-obk · 2024-02-14T15:02:00Z

work towards #79738

We will need to evaluate static items before the definitions.freeze() below, as we will start creating new DefIds (for nested allocations) within the eval_static_initializer query.

But even without that motivation, this is a good change. Hard errors should always be reported and not silenced if other errors happened earlier.

rustbot · 2024-02-14T15:02:10Z

r? @lcnr

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rustbot · 2024-02-14T15:02:12Z

Some changes occurred to the CTFE / Miri engine

cc @rust-lang/miri

rustbot · 2024-02-14T16:47:48Z

Some changes occurred in src/tools/clippy

cc @rust-lang/clippy

rustbot · 2024-02-14T20:17:04Z

The Miri subtree was changed

cc @rust-lang/miri

compiler/rustc_middle/src/mir/interpret/queries.rs

compiler/rustc_hir_analysis/src/lib.rs

tests/ui/consts/const-mut-refs/mut_ref_in_final.stderr

lcnr

r=me after nits + CI

compiler/rustc_lint/src/builtin.rs

lcnr · 2024-02-15T07:35:35Z

tests/ui/consts/miri_unleashed/mutable_references.rs

 static BOO: &mut Foo<()> = &mut Foo(());
+//~^ ERROR encountered mutable pointer in final value of static

 // interior mutability is fine


outdated comment, this test generally feels somewhat useless rn, given that its behavior doesn't depend on -Zunleash-the-miri-inside-of-you afaict?

stderr has a bunch of "skipping check that does not even have a feature gate", so I think it does depend on the unleash flag.

oli-obk · 2024-02-15T12:29:46Z

compiler/rustc_const_eval/src/transform/check_consts/check.rs

        let secondary_errors = mem::take(&mut self.secondary_errors);
        if self.error_emitted.is_none() {
            for error in secondary_errors {
-                error.emit();
+                self.error_emitted = Some(error.emit());


@RalfJung found the issue that caused us to const eval even though there were const qualif errors 🙈

bors · 2024-02-15T13:30:53Z

☔ The latest upstream changes (presumably #116564) made this pull request unmergeable. Please resolve the merge conflicts.

bjorn3 · 2024-02-15T16:09:42Z

as we will start creating new DefIds (for nested allocations) within the eval_static_initializer query.

Wouldn't it be possible to represent the id of nested statics as a pair of "def id of containing static" and "index of this nested static"?

oli-obk · 2024-02-15T16:35:15Z

Wouldn't it be possible to represent the id of nested statics as a pair of "def id of containing static" and "index of this nested static"?

yes, but that just makes everything more complex, as then everything needs to handle this special case. I tried it, and it's annoying to get right. Just generating a new static per nested allocation was significantly simpler.

oli-obk · 2024-02-15T16:35:30Z

@bors r=lcnr

bors · 2024-02-15T16:35:32Z

📌 Commit 7770df0 has been approved by lcnr

It is now in the queue for this repository.

rust-timer · 2024-02-20T12:27:54Z

Finished benchmarking commit (cce6a6e): comparison URL.

Overall result: ❌ regressions - ACTION NEEDED

Next Steps: If you can justify the regressions found in this perf run, please indicate this with @rustbot label: +perf-regression-triaged along with sufficient written justification. If you cannot justify the regressions please open an issue or create a new PR that fixes the regressions, add a comment linking to the newly created issue or PR, and then add the perf-regression-triaged label to this PR.

@rustbot label: +perf-regression
cc @rust-lang/wg-compiler-performance

Instruction count

This is a highly reliable metric that was used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	0.8%	[0.4%, 2.0%]	4
Regressions ❌ (secondary)	1.0%	[0.3%, 5.2%]	11
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.8%	[0.4%, 2.0%]	4

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)	9.9%	[1.5%, 15.6%]	22
Improvements ✅ (primary)	-3.3%	[-4.0%, -2.4%]	3
Improvements ✅ (secondary)	-3.2%	[-5.3%, -1.4%]	3
All ❌✅ (primary)	-3.3%	[-4.0%, -2.4%]	3

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)	3.3%	[2.2%, 4.1%]	7
Regressions ❌ (secondary)	3.2%	[2.8%, 3.7%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	3.3%	[2.2%, 4.1%]	7

Binary size

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

Bootstrap: 641.541s -> 639.567s (-0.31%)
Artifact size: 308.58 MiB -> 310.63 MiB (0.66%)

oli-obk · 2024-02-20T12:55:43Z

Looking into the regressions. They are unintended

…ion, r=<try> Avoid some unnecessary query invocations. Specifically this inlines `const_eval_poly` and avoids computing the generic params, the param env, normalizing the param env and erasing lifetimes on everything. should fix the perf regression from rust-lang#121087

oli-obk · 2024-02-23T10:07:55Z

@rustbot label: +perf-regression-triaged

I fixed the libc regression in #121387

The other regressions' detailed view actually shows improvements instead of a regression, and the benchmarks themselves have been flaky on the same scale as they were affected here, so I'm guessing it's not related

…ion, r=<try> Avoid some unnecessary query invocations. Specifically this inlines `const_eval_poly` and avoids computing the generic params, the param env, normalizing the param env and erasing lifetimes on everything. should fix the perf regression from rust-lang#121087

Always evaluate free constants and statics, even if previous errors occurred work towards rust-lang#79738 We will need to evaluate static items before the `definitions.freeze()` below, as we will start creating new `DefId`s (for nested allocations) within the `eval_static_initializer` query. But even without that motivation, this is a good change. Hard errors should always be reported and not silenced if other errors happened earlier.

…ion, r=lcnr Avoid some unnecessary query invocations. Specifically this inlines `const_eval_poly` and avoids computing the generic params, the param env, normalizing the param env and erasing lifetimes on everything. should fix the perf regression from rust-lang#121087

Avoid some unnecessary query invocations. Specifically this inlines `const_eval_poly` and avoids computing the generic params, the param env, normalizing the param env and erasing lifetimes on everything. should fix the perf regression from rust-lang/rust#121087

rustbot assigned lcnr Feb 14, 2024

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 Feb 14, 2024

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oli-obk force-pushed the eager_const_failures branch from 2cdd83a to 17adcb3 Compare February 15, 2024 05:20

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oli-obk force-pushed the eager_const_failures branch 2 times, most recently from 0bb9b2b to 3f88472 Compare February 15, 2024 11:45

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oli-obk force-pushed the eager_const_failures branch from 3f88472 to e8e0f86 Compare February 15, 2024 12:29

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oli-obk force-pushed the eager_const_failures branch from e8e0f86 to 39d167c Compare February 15, 2024 15:08

oli-obk mentioned this pull request Feb 15, 2024

Tracking issue for &mut T in const contexts (const_mut_refs) #57349

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oli-obk force-pushed the eager_const_failures branch from 39d167c to 7770df0 Compare February 15, 2024 16:19

bors merged commit cce6a6e into rust-lang:master Feb 20, 2024
12 checks passed

rustbot added this to the 1.78.0 milestone Feb 20, 2024

rustbot added the perf-regression Performance regression. label Feb 20, 2024

oli-obk deleted the eager_const_failures branch February 20, 2024 12:41

oli-obk mentioned this pull request Feb 21, 2024

Avoid some unnecessary query invocations. #121387

Merged

matthiaskrgr mentioned this pull request Feb 22, 2024

ICE: assertion failed: layout.is_sized() #121443

Closed

rustbot added the perf-regression-triaged The performance regression has been triaged. label Feb 23, 2024

matthiaskrgr mentioned this pull request Mar 3, 2024

ICE: effects: Unexpected parameter Type(()) when instantiating in region 'x (index=1) #121957

Closed

This was referenced Mar 14, 2024

ICE: Unexpected unsized type tail: &ReStatic [u8] #122488

Closed

ICE: None, compiler/rustc_const_eval/src/interpret/validity.rs #122548

Closed

This was referenced Mar 26, 2024

ICE: !base.layout().is_sized() #123078

Closed

ICE: write_immediate_to_mplace: invalid Scalar layout: TyAndLayout{ ... #123153

Closed

cushionbadak mentioned this pull request Apr 20, 2024

ICE: assertion failed: layout.is_sized() #124182

Open

matthiaskrgr mentioned this pull request Apr 28, 2024

ICE: write_immediate_to_mplace: invalid Scalar layout: TyAndLayout #124464

Closed

cushionbadak mentioned this pull request Apr 30, 2024

ICE: type mismatch when copying! with no feature provided #124552

Closed

lqd mentioned this pull request Jun 26, 2024

ICE: assertion left == right failed in rustc_const_eval/src/interpret/cast.rs unsize_into #126982

Open

This was referenced Jul 13, 2024

ICE: primitive read not possible for type #127676

Open

ICE: failed to resolve instance for ErrorGuaranteed() #127826

Open

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Always evaluate free constants and statics, even if previous errors occurred #121087

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Always evaluate free constants and statics, even if previous errors occurred #121087

Always evaluate free constants and statics, even if previous errors occurred #121087

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Overall result: ❌ regressions - ACTION NEEDED

Instruction count

Max RSS (memory usage)

Cycles

Binary size

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