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Rollup of 8 pull requests #122866

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Successful merges:

r? @ghost
@rustbot modify labels: rollup

Create a similar rollup

RossSmyth and others added 24 commits March 5, 2024 23:34
Co-authored-by: Josh Stone <jistone@redhat.com>
…getters a bit

- rename mutating functions to be more scary
- add a new raw bytes getter
when it is the default value of a generic param
Feels more complete, and for ImplPolarity has the side-effect of making
sure we also handle reservation impls correctly
Arrays, surprisingly, are not sized to u64 on all platforms.
Some of the marker statements used by coverage are added during MIR building
for use by the InstrumentCoverage pass (during analysis), and are not needed
afterwards.
Experimental feature postfix match

This has a basic experimental implementation for the RFC postfix match (rust-lang/rfcs#3295, rust-lang#121618). [Liaison is](https://rust-lang.zulipchat.com/#narrow/stream/213817-t-lang/topic/Postfix.20Match.20Liaison/near/423301844) `@scottmcm` with the lang team's [experimental feature gate process](https://github.com/rust-lang/lang-team/blob/master/src/how_to/experiment.md).

This feature has had an RFC for a while, and there has been discussion on it for a while. It would probably be valuable to see it out in the field rather than continue discussing it. This feature also allows to see how popular postfix expressions like this are for the postfix macros RFC, as those will take more time to implement.

It is entirely implemented in the parser, so it should be relatively easy to remove if needed.

This PR is split in to 5 commits to ease review.

1. The implementation of the feature & gating.
2. Add a MatchKind field, fix uses, fix pretty.
3. Basic rustfmt impl, as rustfmt crashes upon seeing this syntax without a fix.
4. Add new MatchSource to HIR for Clippy & other HIR consumers
…r=davidtwco

Gracefully handle `AnonConst` in `diagnostic_hir_wf_check()`

Instead of running the WF check on the `AnonConst` itself we run it on the `ty` of the generic param of which the `AnonConst` is the default value.

Fixes rust-lang#122199
…li-obk

interpret/allocation: fix aliasing issue in interpreter and refactor getters a bit

That new raw getter will be needed to let Miri pass pointers to natively executed FFI code ("extern-so" mode).

While doing that I realized our get_bytes_mut are named less scary than get_bytes_unchecked so I rectified that. Also I realized `mem_copy_repeatedly` would break if we called it for multiple overlapping copies so I made sure this does not happen.

And I realized that we are actually [violating Stacked Borrows in the interpreter](https://rust-lang.zulipchat.com/#narrow/stream/136281-t-opsem/topic/I.20think.20Miri.20violates.20Stacked.20Borrows.20.F0.9F.99.88).^^ That was introduced in rust-lang#87777.

r? `@oli-obk`
coverage: Clean up marker statements that aren't needed later

Some of the marker statements used by coverage are added during MIR building for use by the InstrumentCoverage pass (during analysis), and are not needed afterwards.

`@rustbot` label +A-code-coverage
…Amanieu

Add `NonNull::<[T]>::is_empty`.

As per rust-lang#71146 (comment)

I figured this should be fine to be insta-stable (with an FCP), but I can edit if that is not desired.

r? `@Amanieu`
…, r=lcnr

Split out `PredicatePolarity` from `ImplPolarity`

Because having to deal with a third `Reservation` level in all the trait solver code is kind of weird.

r? ``@lcnr`` or ``@oli-obk``
…ack-workaround-on-overflow, r=TaKO8Ki

Suggest `RUST_MIN_STACK` workaround on overflow

For some Rust crates, like p384, we can't do a whole lot about it even if the stack overflow is reported like in rust-lang#122357 because the problem may be inside LLVM or another codegen backend. We can, however, suggest people set a new `RUST_MIN_STACK` value while handling the SIGSEGV, as that stack-setting will carry forward into the dylib.

As a bonus, this also leads to cleaning up the stack-setting code a bit.
…inism, r=compiler-errors

Fix Itanium mangling usizes

Arrays, surprisingly, are not sized to u64 on all platforms.

Fixes rust-lang#122851.

r? `@compiler-errors`

cc `@maurer`
@rustbot rustbot added PG-exploit-mitigations Project group: Exploit mitigations 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. T-libs Relevant to the library team, which will review and decide on the PR/issue. WG-trait-system-refactor The Rustc Trait System Refactor Initiative rollup A PR which is a rollup labels Mar 22, 2024
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@bors r+ rollup=never p=8

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bors commented Mar 22, 2024

📌 Commit e5fcc6a has been approved by matthiaskrgr

It is now in the queue for this repository.

@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 Mar 22, 2024
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The job x86_64-gnu-llvm-17 failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)
#17 exporting to docker image format
#17 sending tarball 44.9s done
#17 DONE 55.4s
##[endgroup]
Setting extra environment values for docker:  --env ENABLE_GCC_CODEGEN=1 --env GCC_EXEC_PREFIX=/usr/lib/gcc/
[CI_JOB_NAME=x86_64-gnu-llvm-17]
---
sccache: Starting the server...
##[group]Configure the build
configure: processing command line
configure: 
configure: build.configure-args := ['--build=x86_64-unknown-linux-gnu', '--llvm-root=/usr/lib/llvm-17', '--enable-llvm-link-shared', '--set', 'rust.thin-lto-import-instr-limit=10', '--set', 'change-id=99999999', '--enable-verbose-configure', '--enable-sccache', '--disable-manage-submodules', '--enable-locked-deps', '--enable-cargo-native-static', '--set', 'rust.codegen-units-std=1', '--set', 'dist.compression-profile=balanced', '--dist-compression-formats=xz', '--disable-dist-src', '--release-channel=nightly', '--enable-debug-assertions', '--enable-overflow-checks', '--enable-llvm-assertions', '--set', 'rust.verify-llvm-ir', '--set', 'rust.codegen-backends=llvm,cranelift,gcc', '--set', 'llvm.static-libstdcpp', '--enable-new-symbol-mangling']
configure: target.x86_64-unknown-linux-gnu.llvm-config := /usr/lib/llvm-17/bin/llvm-config
configure: llvm.link-shared     := True
configure: rust.thin-lto-import-instr-limit := 10
configure: change-id            := 99999999
---
   Compiling rustc_codegen_llvm v0.0.0 (/checkout/compiler/rustc_codegen_llvm)
error[E0308]: mismatched types
   --> compiler/rustc_trait_selection/src/solve/trait_goals.rs:465:39
    |
465 |         if goal.predicate.polarity != ty::ImplPolarity::Positive {
    |            -----------------------    ^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `PredicatePolarity`, found `ImplPolarity`
    |            |
    |            expected because this is `PredicatePolarity`
For more information about this error, try `rustc --explain E0308`.
error: could not compile `rustc_trait_selection` (lib) due to 1 previous error
warning: build failed, waiting for other jobs to finish...
Build completed unsuccessfully in 0:01:55

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PG-exploit-mitigations Project group: Exploit mitigations rollup A PR which is a rollup 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. T-libs Relevant to the library team, which will review and decide on the PR/issue. WG-trait-system-refactor The Rustc Trait System Refactor Initiative
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