Split MIR building into its own crate #67901
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| let ecx = mk_eval_cx(tcx, DUMMY_SP, param_env, false); | ||
| let op = ecx.eval_const_to_op(val, None).unwrap(); | ||
| ecx.read_discriminant(op).unwrap().1 | ||
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| let variant = ecx.read_discriminant(op).unwrap().1; |
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Looks like the only change in this PR that’s not trivial code movement.
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r=me once #67898 lands. |
Centril
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| @@ -505,6 +505,15 @@ rustc_queries! { | |||
| desc { "extract field of const" } | |||
| } | |||
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| /// Destructure a constant ADT or array into its variant indent and its | |||
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indent vs. ident vs. index... typo?
| @@ -0,0 +1,27 @@ | |||
| //! Construction of MIR from HIR. | |||
| //! | |||
| //! This crate also contains the match exhaustiveness and usefulness checking. | |||
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Let's follow up with moving this out from here as well (into two crates, one for HAIR and one for match checking)? It feels unrelated to MIR building other than the HAIR structure as an in-between IR.
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Match "exhaustiveness" and "usefulness" calculations referred to here are probably fairly bad description for what is being done in that code. They do not do any analysis that result in user-visible messages or anything of the sort. Rather that analysis is performed entirely as the part of – and for the purpose of – building MIR graph that only contains the relevant and necessary branches.
The analysis and the code building portions are heavily interleaved and I don’t believe splitting just for the sake of splitting is meaningful here. Especially now that librustc_mir_build is a relatively tiny crate already.
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Match "exhaustiveness" and "usefulness" calculations referred to here are probably fairly bad description for what is being done in that code.
On the contrary, they feel like apt descriptions of the analysis that hair::{_match, check_match} and friends are doing.
They do not do any analysis that result in user-visible messages or anything of the sort.
Match checking certainly results in emitting plenty of its own error messages whether it be from exhaustiveness checking or other types of analysis in check_match.
Rather that analysis is performed entirely as the part of – and for the purpose of – building MIR graph that only contains the relevant and necessary branches.
I don't think that's correct. MIR is in fact not sound by construction due to not verifying the exhaustiveness of matches which is done on HAIR, which I think is a language in its own right. One could say that rustc_typeck is only performed for the purpose of eventual MIR output, but that doesn't make HIR less of a language.
The analysis and the code building portions are heavily interleaved and I don’t believe splitting just for the sake of splitting is meaningful here. Especially now that
librustc_mir_buildis a relatively tiny crate already.
I grepped quickly and searching for crate::build seems to generate zero hits in src/librustc_mir/hair/ so this doesn't seem to be accurate?
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☔ The latest upstream changes (presumably #67886) made this pull request unmergeable. Please resolve the merge conflicts. |
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@bors r=nagisa rollup=never |
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…gisa
Split MIR building into its own crate
This moves `rustc_mir::{build, hair, lints}` to `rustc_mir_build`.
The new crate only has a `provide` function as it's public API.
Based on rust-lang#67898
cc @Centril @rust-lang/compiler
r? @oli-obk
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☔ The latest upstream changes (presumably #67970) made this pull request unmergeable. Please resolve the merge conflicts. |
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☔ The latest upstream changes (presumably #68034) made this pull request unmergeable. Please resolve the merge conflicts. |
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@bors r=nagisa |
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@bors r=nagisa |
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📌 Commit a8df0332e94fee565f4455424b894b1fab9c3566 has been approved by |
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⌛ Testing commit a8df0332e94fee565f4455424b894b1fab9c3566 with merge d7bad2591ffb41b516587165853001fff3267731... |
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💔 Test failed - checks-azure |
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Split MIR building into its own crate
This moves `rustc_mir::{build, hair, lints}` to `rustc_mir_build`.
The new crate only has a `provide` function as it's public API.
Based on #67898
cc @Centril @rust-lang/compiler
r? @oli-obk
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☀️ Test successful - checks-azure |
This was referenced Jan 12, 2020
eddyb
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| /// The constituent parts of an ADT or array. | ||
| #[derive(Copy, Clone, Debug, HashStable)] | ||
| pub struct DestructuredConst<'tcx> { | ||
| pub variant: VariantIdx, | ||
| pub fields: &'tcx [&'tcx ty::Const<'tcx>], | ||
| } |
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Shouldn't this be under mir::interpret?
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🤷 seems fine to me here. It's just a query return type that you won't ever mention yourself. You'll just access the fields.
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This moves
rustc_mir::{build, hair, lints}torustc_mir_build.The new crate only has a
providefunction as it's public API.Based on #67898
cc @Centril @rust-lang/compiler
r? @oli-obk