Continue to get rid of `ty::Const::{try_}eval*` by compiler-errors · Pull Request #130950 · rust-lang/rust

compiler-errors · 2024-09-27T20:22:24Z

This PR mostly does:

Removes all of the try_eval_* and eval_* helpers from ty::Const, and replace their usages with try_to_*.
Remove ty::Const::eval.
Rename ty::Const::normalize to ty::Const::normalize_internal. This function is still used in the normalization code itself.
Fix some weirdness around the TransmuteFrom goal.

I'm happy to split it out further; for example, I could probably land the first part which removes the helpers, or the changes to codegen which are more obvious than the changes to tools.

r? BoxyUwU

Part of #130704

rustbot · 2024-09-27T20:22:35Z

Some changes occurred in src/tools/clippy

cc @rust-lang/clippy

Some changes occurred in engine.rs, potentially modifying the public API of ObligationCtxt.

cc @lcnr, @compiler-errors

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

Some changes occurred to the CTFE / Miri interpreter

cc @rust-lang/miri

Some changes occurred in compiler/rustc_codegen_gcc

cc @antoyo, @GuillaumeGomez

Some changes occurred in compiler/rustc_codegen_cranelift

cc @bjorn3

Some changes occurred in compiler/rustc_sanitizers

cc @rust-lang/project-exploit-mitigations, @rcvalle

The Miri subtree was changed

cc @rust-lang/miri

compiler-errors · 2024-09-27T21:03:26Z

ah debuginfo

compiler-errors · 2024-09-27T21:56:34Z

- if let Some(len) =
- len.try_eval_target_usize(self.tcx, self.tcx.param_env(adt.did()))
- {
+ if let Some(len) = len.try_to_target_usize(self.tcx) {


This possibly may need to be normalized w/ lazy norm?

compiler-errors · 2024-09-27T21:59:28Z

 }
 }
+
+ /// Normalize a type for when it is structurally matched on.


We need this so we can structurally normalize a const in consider_builtin_transmute_candidate. That structurally matches on an Assume struct which contains a bunch of bools for configuration.

compiler-errors · 2024-09-27T22:00:28Z

 span: Span,
 ) -> GetSafeTransmuteErrorAndReason {
 use rustc_transmute::Answer;
+ self.probe(|_| {


Best reviewed without whitespace. We added a probe so we can normalize below without side-effects.

compiler-errors · 2024-09-27T22:00:58Z

 use rustc_span::symbol::sym;

- let Ok((ty, cv)) = c.eval(tcx, param_env, DUMMY_SP) else {
- return Some(Self {


This was sketchy. If a const was failing to eval, we just returned "whatever". 🤔

compiler-errors · 2024-09-28T04:03:50Z

@rustbot author

some doctest is failing fml

bors · 2024-09-30T06:33:58Z

☔ The latest upstream changes (presumably #131036) made this pull request unmergeable. Please resolve the merge conflicts.

compiler-errors · 2024-10-16T00:56:14Z

@rustbot ready

bors · 2024-10-18T23:28:17Z

☔ The latest upstream changes (presumably #131892) made this pull request unmergeable. Please resolve the merge conflicts.

BoxyUwU · 2024-10-19T11:19:47Z

I resolved the large threads since they were making it hard to review the actual code changes themselves and it also seemed like @RalfJung had a better understanding of what's going on now? Apologies if this was over-eager ^^

BoxyUwU

Thank you :3 Looks good to me, sorry for taking so long to review. Once you resolve the nit, rebase, and maybe squash some of these commits? r=me

BoxyUwU · 2024-10-20T13:24:31Z

@bors r+ rollup=never

bors · 2024-10-20T13:24:34Z

📌 Commit 5cf8107 has been approved by BoxyUwU

It is now in the queue for this repository.

bors · 2024-10-21T03:46:32Z

⌛ Testing commit 5cf8107 with merge f2ba411...

bors · 2024-10-21T06:12:27Z

☀️ Test successful - checks-actions
Approved by: BoxyUwU
Pushing f2ba411 to master...

rust-timer · 2024-10-21T07:40:06Z

Finished benchmarking commit (f2ba411): 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 (secondary -1.2%)

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)	4.2%	[4.2%, 4.2%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-3.9%	[-4.5%, -3.2%]	2
All ❌✅ (primary)	-	-	0

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: 781.459s -> 781.789s (0.04%)
Artifact size: 333.77 MiB -> 333.65 MiB (-0.03%)

rustbot assigned BoxyUwU Sep 27, 2024

compiler-errors changed the title ~~Yeet eval~~Continue to get rid of try::Const::{try_}eval*Sep 27, 2024

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compiler-errors force-pushed the yeet-eval branch from 627a151 to 98b5f4fCompare September 27, 2024 21:20

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compiler-errors commented Sep 27, 2024
View reviewed changes

oli-obk changed the title ~~Continue to get rid of try::Const::{try_}eval*~~Continue to get rid of ty::Const::{try_}eval*Sep 27, 2024

rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Sep 28, 2024

RalfJung reviewed Sep 28, 2024
View reviewed changes

Comment threadcompiler/rustc_middle/src/ty/consts.rs
Comment threadcompiler/rustc_middle/src/mir/consts.rs

RalfJung reviewed Sep 28, 2024
View reviewed changes

Comment threadcompiler/rustc_middle/src/ty/consts.rs

compiler-errors mentioned this pull request Oct 3, 2024
TransmuteFrom: Gracefully handle unnormalized types and normalization errors #131112
Merged

compiler-errors force-pushed the yeet-eval branch from 98b5f4f to 66760f4Compare October 5, 2024 16:05

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Oct 16, 2024

BoxyUwU reviewed Oct 19, 2024
View reviewed changes

Comment threadcompiler/rustc_next_trait_solver/src/solve/mod.rs Outdated

compiler-errors added 2 commits October 19, 2024 18:07

Get rid of const eval_* and try_eval_* helpers
e83e4e8

Rename normalize to normalize_internal, remove unnecessary usages
38bbcc0

compiler-errors added 2 commits October 19, 2024 18:07

Fix transmute goal
9453d2c

Fix tests
5cf8107

compiler-errors force-pushed the yeet-eval branch from 66760f4 to 5cf8107Compare October 19, 2024 18:07

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 Oct 20, 2024

bors added the merged-by-bors This PR was explicitly merged by bors. label Oct 21, 2024

bors merged commit f2ba411 into rust-lang:masterOct 21, 2024

rustbot added this to the 1.84.0 milestone Oct 21, 2024

bors mentioned this pull request Oct 21, 2024
Use ConstArgKind::Path for all single-segment paths, not just params under min_generic_const_args#131081
Merged

compiler-errors deleted the yeet-eval branch October 21, 2024 15:52

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Overall result: no relevant changes - no action needed

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compiler-errors commented Sep 27, 2024•
edited by RalfJung
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