coverage: Add enums to accommodate other kinds of coverage mappings
Extracted from #118305.
LLVM supports several different kinds of coverage mapping regions, but currently we only ever emit ordinary “code” regions. This PR performs the plumbing required to add other kinds of regions as enum variants, but does not add any specific variants other than `Code`.
The main motivation for this change is branch coverage, but it will also allow separate experimentation with gap regions and skipped regions, which might help in producing more accurate and useful coverage reports.
---
``@rustbot`` label +A-code-coverage
Remove `DiagnosticBuilder::buffer`
`DiagnosticBuilder::buffer` doesn't do much, and part of what it does (for `-Ztreat-err-as-bug`) it shouldn't.
This PR strips it back, replaces its uses, and finally removes it, making a few cleanups in the vicinity along the way.
r? ``@oli-obk``
Silence some follow-up errors [2/x]
this is one piece of the requested cleanups from https://github.com/rust-lang/rust/pull/117449
the `type_of` query frequently uses astconv to convert a `hir::Ty` to a `ty::Ty`. This process is infallible, but may produce errors as it goes. All the error reporting sites that had access to the `ItemCtxt` are now tainting it, causing `type_of` to return a `ty::Error` instead of anything else.
annotate-snippets: update to 0.10
Ports `annotate-snippets` to 0.10, temporary dupes versions; other crates left that depends on 0.9 is `ui_test` and `rustfmt`.
Remove a large amount of leb128-coded integers
This removes ~41%[^1] of the leb128-encoded integers serialized during libcore compilation by changing enum tags to opportunistically use `u8` where feasible instead of the leb128 coding via `usize`.
This should have effectively zero impact on metadata file sizes, since almost all or all enum tags fit into the 7 bits available in leb128 for single-byte encodings. Perf results indicate this is basically neutral across the board except for an improvement in bootstrap time.
[^1]: More than half the remaining integers still fit into <= 128, so the leb128 coding still makes sense. 32% are zero, and 46% are <= 4.
bump bootstrap dependencies
This PR removes hard-coded patch versions, updates bootstrap's dependency stack to recent versions (some of the versions were released 3-4 years ago), and removes a few dependencies from bootstrap.
Removed dependencies:
One consequence is that errors returned by
`maybe_new_parser_from_source_str` now must be consumed, so a bunch of
places that previously ignored those errors now cancel them. (Most of
them explicitly dropped the errors before. I guess that was to indicate
"we are explicitly ignoring these", though I'm not 100% sure.)
Add debug info for macOS CI actions
This adds some debugging information to the CI logs about the macOS runners to potentially help diagnose performance issues. I think this is unlikely to help, since I think the most likely issue is over-provisioning, but I figured it might be a worthy shot in the dark. The macos-12 runners definitely have issues with SIP randomly being enabled, but I have not seen evidence of that for macos-13.
bootstrap: exclude link_jobs from `check_ci_llvm!` checks
This option is largely there to help people to manage the memory usage on their systems during the LLVM build. The linking phase is as usual are the heaviest part of the build and if in an unlucky conincidence the circumstances align to kick off N_CORES links at the same time, not even hundreds of GiB of memory may suffice. It makes a lot of sense for developers to set&forget this option unconditionally based on how buff their development device is.
Not to mention, this option does not, in any way, affect the generated code (at least as far as I know.) It really doesn’t matter what option the CI build LLVM used here and/or if it matches with the user’s configuration.
Finally, 0 actual link jobs implied by `download-ci-llvm` is guaranteed to stay within the limits that are reasonable to set with this option.
Stop mentioning internal lang items in no_std binary errors
When writing a no_std binary, you'll be greeted with nonsensical errors mentioning lang items like eh_personality and start. That's pretty bad because it makes you think that you need to define them somewhere! But oh no, now you're getting the `internal_features` lint telling you that you shouldn't use them! But you need a no_std binary! What now?
No problem! Writing a no_std binary is super easy. Just use panic=abort and supply your own platform specific entrypoint symbol (like `main`) and you're good to go. Would be nice if the compiler told you that, right?
This makes it so that it does do that.
I don't _love_ the new messages yet, but they're decent I think. They can probably be improved, please suggest improvements.
Two different lifetimes are conflated. This doesn't matter right now,
but needs to be fixed for the next commit to work. And the more
descriptive lifetime names make the code easier to read.
But we can't easily switch from `Vec<Diagnostic>` to
`Vec<DiagnosticBuilder<G>>` because there's a mix of errors and warnings
which result in different `G` types. So we must make
`DiagnosticBuilder::into_diagnostic` public, but that's ok, and it will
get more use in subsequent commits.
Each of these has a single call site: `source_file_to_parser`,
`try_file_to_source_file`, `file_to_source_file`. Having them separate
just makes the code longer and harder to read.
Also, `maybe_file_to_stream` doesn't need to be `pub`.
It seems very wrong to have a `-Ztreat-err-as-bug` check here before the
error is even emitted.
Once that's done:
- `into_diagnostic` is infallible, so its return type doesn't need the
`Option`;
- the `&'a DiagCtxt` also isn't needed, because only one callsite uses
it, and it already have access to it via `self.dcx`;
- the comments about dcx disabling buffering are no longer true, this is
unconditional now;
- and the `debug!` seems unnecessary... the comment greatly overstates
its importance because few diagnostics come through `into_diagnostic`,
and `-Ztrack-diagnostics` exists anyway.
Errors in `DiagCtxtInner::emit_diagnostic` are never set to
`Level::Bug`, because the condition never succeeds, because
`self.treat_err_as_bug()` is called *before* the error counts are
incremented.
This commit switches to `self.treat_next_err_as_bug()`, fixing the
problem. This changes the error message output to actually say "internal
compiler error".
This is less elegant in some ways, since we no longer visit a BCB's spans as a
batch, but will make it much easier to add support for other kinds of coverage
mapping regions (e.g. branch regions or gap regions).
Reorder early post-inlining passes.
`RemoveZsts`, `RemoveUnneededDrops` and `UninhabitedEnumBranching` only depend on types, so they should be executed together early after MIR inlining introduces those types.
This does not change the end-result, but this makes the pipeline a bit more consistent.
Rollup of 11 pull requests
Successful merges:
- #115046 (Use version-sorting for all sorting)
- #118915 (Add some comments, add `can_define_opaque_ty` check to `try_normalize_ty_recur`)
- #119006 (Fix is_global special address handling)
- #119637 (Pass LLVM error message back to pass wrapper.)
- #119715 (Exhaustiveness: abort on type error)
- #119763 (Cleanup things in and around `Diagnostic`)
- #119788 (change function name in comments)
- #119790 (Fix all_trait* methods to return all traits available in StableMIR)
- #119803 (Silence some follow-up errors [1/x])
- #119804 (Stabilize mutex_unpoison feature)
- #119832 (Meta: Add project const traits to triagebot config)
r? `@ghost`
`@rustbot` modify labels: rollup
Silence some follow-up errors [1/x]
this is one piece of the requested cleanups from https://github.com/rust-lang/rust/pull/117449
When we use `-> impl SomeTrait<_>` as a return type, we are both using the "infer return type suggestion" code path, and the infer opaque type code path within the same function. That can lead to confusing diagnostics, so silence all opaque type diagnostics in that case.
Cleanup things in and around `Diagnostic`
These changes all arose when I was looking closely at how to simplify `DiagCtxtInner::emit_diagnostic`.
r? `@compiler-errors`
Pass LLVM error message back to pass wrapper.
When rustc fails to load a plugin, it should provide more detailed error message. Before this PR, rustc prints:
```
error: failed to run LLVM passes: Failed to load pass pluginPLUGIN_NAME.so
```
This PR passes LLVM errors back to rustc. After this PR, rustc prints:
```
error: failed to run LLVM passes: Could not load library 'PLUGIN_NAME.so': PLUGIN_NAME.so: undefined symbol: _ZN4llvm9DebugFlagE
```
This PR only contains usability improvements and does not change any functionality. Thus, no new unit test is implemented.
