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Fix ICE in improper_ctypes_definitions lint with all-ZST transparent types #87529

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merged 1 commit into from
Sep 17, 2021
Merged

Fix ICE in improper_ctypes_definitions lint with all-ZST transparent types #87529

merged 1 commit into from
Sep 17, 2021

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FabianWolff
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Fixes #87496. There is also another function in the same file that looks fishy, but I haven't been able to produce an ICE there, and in any case, it's not related to #87496:

rust/compiler/rustc_lint/src/types.rs

Lines 720 to 734 in fd853c0

fn get_nullable_type<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<Ty<'tcx>> {
let tcx = cx.tcx;
Some(match *ty.kind() {
ty::Adt(field_def, field_substs) => {
let inner_field_ty = {
let first_non_zst_ty =
field_def.variants.iter().filter_map(|v| transparent_newtype_field(cx.tcx, v));
debug_assert_eq!(
first_non_zst_ty.clone().count(),
1,
"Wrong number of fields for transparent type"
);
first_non_zst_ty
.last()
.expect("No non-zst fields in transparent type.")

r? @JohnTitor

@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jul 27, 2021
@FabianWolff FabianWolff mentioned this pull request Jul 27, 2021
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hellow554
hellow554 reviewed Jul 28, 2021
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src/test/ui/repr/repr-transparent-issue-87496.rs Outdated
Comment on lines 6 to 10
struct TransparentCustomZst(());
extern "C" {
fn good17(p: TransparentCustomZst);
}
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you could make the struct and extern fn pub to avoid warnings :)

@JohnTitor
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LGTM, thanks for the follow-up! But I'm not part of t-compiler, so r? @nikomatsakis for the final review

@camelid camelid added the A-ffi Area: Foreign Function Interface (FFI) label Jul 29, 2021
nikomatsakis
nikomatsakis requested changes Jul 30, 2021
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Per @camelid's point, the behavior for "all ZST fields" seems incorrect.

@FabianWolff
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@rustbot ready

@JohnCSimon JohnCSimon added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Aug 15, 2021
@inquisitivecrystal inquisitivecrystal added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Aug 24, 2021
@JohnCSimon
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Triage:
@FabianWolff can you mark the change request from nikomatsakis as completed if you've completed it? Thanks.

@FabianWolff
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Triage:
@FabianWolff can you mark the change request from nikomatsakis as completed if you've completed it? Thanks.

@JohnCSimon What exactly do you mean by this? I thought that's what the @rustbot ready is for (though it doesn't really seem to have had an effect above...). In any case, I've clicked on "Re-request review" for now.

@nikomatsakis
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Ugh! Sorry @FabianWolff, reading now!

@nikomatsakis
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@bors r+

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bors commented Sep 15, 2021

📌 Commit 4e76c38 has been approved by nikomatsakis

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bors commented Sep 15, 2021

🌲 The tree is currently closed for pull requests below priority 100. This pull request will be tested once the tree is reopened.

@bors 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 Sep 15, 2021
Manishearth added a commit to Manishearth/rust that referenced this pull request Sep 16, 2021
@Manishearth
Rollup merge of rust-lang#87529 - FabianWolff:issue-87496, r=nikomats…
4078cbf 
…akis

Fix ICE in `improper_ctypes_definitions` lint with all-ZST transparent types

Fixes rust-lang#87496. There is also another function in the same file that looks fishy, but I haven't been able to produce an ICE there, and in any case, it's not related to rust-lang#87496:
https://github.com/rust-lang/rust/blob/fd853c00e255559255885aadff9e93a1760c8728/compiler/rustc_lint/src/types.rs#L720-L734

r? `@JohnTitor`
@Manishearth Manishearth mentioned this pull request Sep 16, 2021
Closed
GuillaumeGomez added a commit to GuillaumeGomez/rust that referenced this pull request Sep 16, 2021
@GuillaumeGomez
Rollup merge of rust-lang#87529 - FabianWolff:issue-87496, r=nikomats…
dc7a66c 
…akis

Fix ICE in `improper_ctypes_definitions` lint with all-ZST transparent types

Fixes rust-lang#87496. There is also another function in the same file that looks fishy, but I haven't been able to produce an ICE there, and in any case, it's not related to rust-lang#87496:
https://github.com/rust-lang/rust/blob/fd853c00e255559255885aadff9e93a1760c8728/compiler/rustc_lint/src/types.rs#L720-L734

r? ``@JohnTitor``
@GuillaumeGomez GuillaumeGomez mentioned this pull request Sep 16, 2021
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@JohnTitor JohnTitor mentioned this pull request Sep 17, 2021
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bors added a commit to rust-lang-ci/rust that referenced this pull request Sep 17, 2021
@bors
Auto merge of rust-lang#89037 - JohnTitor:rollup-rd9btbs, r=JohnTitor
1c03f0d 
Rollup of 10 pull requests

Successful merges:

 - rust-lang#86382 (Make diagnostics clearer for `?` operators)
 - rust-lang#87529 (Fix ICE in `improper_ctypes_definitions` lint with all-ZST transparent types)
 - rust-lang#88339 (Add TcpListener::into_incoming and IntoIncoming)
 - rust-lang#88735 (Don't lint about missing code examples in derived traits)
 - rust-lang#88751 (Couple of changes to FileSearch and SearchPath)
 - rust-lang#88883 (Move some tests to more reasonable directories - 7)
 - rust-lang#88887 (Const Deref)
 - rust-lang#88911 (Improve error message for type mismatch in generator arguments)
 - rust-lang#89014 (PassWrapper: handle separate Module*SanitizerPass)
 - rust-lang#89033 (Set the library path in sysroot-crates-are-unstable)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 81dc216 into rust-lang:master Sep 17, 2021
@rustbot rustbot added this to the 1.57.0 milestone Sep 17, 2021
@ChrisDenton ChrisDenton mentioned this pull request Jan 28, 2022
Closed
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@nikomatsakis nikomatsakis nikomatsakis approved these changes

@JohnTitor JohnTitor JohnTitor approved these changes

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A-ffi Area: Foreign Function Interface (FFI) S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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Successfully merging this pull request may close these issues.

ICE: compiler/rustc_lint/src/types.rs:859:17: malformed transparent type
10 participants
@FabianWolff @JohnTitor @JohnCSimon @nikomatsakis @bors @hellow554 @camelid @rust-highfive @inquisitivecrystal @rustbot