Rename 'src/bootstrap/native.rs' to llvm.rs
Fixed#108240
Renamed 'native.rs' to 'llvm.rs', also moved `TestHelpers` to `test.rs`. Replaced all the `native.rs` occurrences at `src/bootstrap` files to `llvm.rs`
More config.toml.example cleanups
- Link to more documentation
- Move `changelog-seen` into the "Global Settings" section
- Update incorrect comments on `llvm.link-shared` and `rust.debug-assertions`
- Use the correct default in the commented-out example more often
- Clarify that `docs` and `compiler-docs` only control the default, they're not a hard-off switch.
- Document `-vvv` and `local-rebuild`
- Minor improvements to doc-comments in config.toml.example
This also sets `download-rustc = false`; that was already the default, but it will be helpful in case the default changes (https://jyn.dev/2023/01/12/Bootstrapping-Rust-in-2023.html).
- Link to more documentation
- Move `changelog-seen` into the "Global Settings" section
- Update incorrect comments on `llvm.link-shared` and
`rust.debug-assertions`
- Use the correct default in the commented-out example more often
- Clarify that `docs` and `compiler-docs` only control the default,
they're not a hard-off switch.
- Document `-vvv` and `local-rebuild`
- Minor improvements to doc-comments in config.toml.example
This also sets `download-rustc = false`; that was already the default,
but it will be helpful in case the default changes
(https://jyn.dev/2023/01/12/Bootstrapping-Rust-in-2023.html).
Don't elaborate non-obligations into obligations
It's suspicious to elaborate a `PolyTraitRef` or `Predicate` into an `Obligation`, since the former does not have a param-env associated with it, but the latter does. This is a footgun that, while not being misused *currently* in the compiler, easily could be misused by someone less familiar with the elaborator's inner workings.
This PR just changes the API -- ideally, the elaborator wouldn't even have to deal with obligations if we're not elaborating obligations, but that would require a bit more abstraction than I could be bothered with today.
Fix "Directly go to item in search if there is only one result" setting
Part of #66181.
The setting was actually broken, so I fixed it when I added the GUI test.
r? `@notriddle`
Permit the MIR inliner to inline diverging functions
This heuristic prevents inlining of `hint::unreachable_unchecked`, which in turn makes `Option/Result::unwrap_unchecked` a bad inlining candidate. I looked through the changes to `core`, `alloc`, `std`, and `hashbrown` by hand and they all seem reasonable. Let's see how this looks in perf...
---
Based on rustc-perf it looks like this regresses ctfe-stress, and the cachegrind diff indicates that this regression is in `InterpCx::statement`. I don't know how to do any deeper analysis because that function is _enormous_ in the try toolchain, which has no debuginfo in it. And a local build produces significantly different codegen for that function, even with LTO.
Upgrade to LLVM 16, again
Relative to the previous attempt in https://github.com/rust-lang/rust/pull/107224:
* Update to GCC 8.5 on dist-x86_64-linux, to avoid std::optional ABI-incompatibility between libstdc++ 7 and 8.
* Cherry-pick 96df79af02.
* Cherry-pick 6fc670e5e3.
r? `@cuviper`
Bugfix: avoid panic on invalid json output from libtest
#108659 introduces a custom test display implementation. It does so by using libtest to output json. The stdout is read and parsed; The code trims the line read and checks whether it starts with a `{` and ends with a `}`. If so, it concludes that it must be a json encoded `Message`. Unfortunately, this does not work in all cases:
- This assumes that tests running with `--nocapture` will never start and end lines with `{` and `}` characters
- Output is generated by issuing multiple `write_message` [statements](https://github.com/rust-lang/rust/blob/master/library/test/src/formatters/json.rs#L33-L60). Where only the last one issues a `\n`. This likely results in a race condition as we see multiple json outputs on the same line when running tests for the `x86_64-fortanix-unknown-sgx` target:
```
10:21:04 [0m[0m[1m[32m Running[0m tests/run-time-detect.rs (build/x86_64-unknown-linux-gnu/stage1-std/x86_64-fortanix-unknown-sgx/release/deps/run_time_detect-8c66026bd4b1871a)
10:21:04
10:21:04 running 1 tests
10:21:04 test x86_all ... ok
10:21:04 [0m[0m[1m[32m Running[0m tests/thread.rs (build/x86_64-unknown-linux-gnu/stage1-std/x86_64-fortanix-unknown-sgx/release/deps/thread-ed5456a7d80a6193)
10:21:04 thread 'main' panicked at 'failed to parse libtest json output; error: trailing characters at line 1 column 135, line: "{ \"type\": \"suite\", \"event\": \"ok\", \"passed\": 1, \"failed\": 0, \"ignored\": 0, \"measured\": 0, \"filtered_out\": 0, \"exec_time\": 0.000725911 }{ \"type\": \"suite\", \"event\": \"started\", \"test_count\": 1 }\n"', render_tests.rs:108:25
```
This PR implements a partial fix by being much more conservative of what it asserts is a valid json encoded `Message`. This prevents panics, but still does not resolve the race condition. A discussion is needed where this race condition comes from exactly and how it best can be avoided.
cc: `@jethrogb,` `@pietroalbini`
rustdoc: Optimize impl sorting during rendering
This should fix the perf regression on [bitmaps-3.1.0](https://github.com/rust-lang/rustc-perf/tree/master/collector/compile-benchmarks/bitmaps-3.1.0) from https://github.com/rust-lang/rust/pull/107765.
The bitmaps crate has a lot of impls:
```rust
impl Bits for BitsImpl<1> { ... }
impl Bits for BitsImpl<2> { ... }
// ...
impl Bits for BitsImpl<1023> { ... }
impl Bits for BitsImpl<1024> { ... }
```
and the logic in `fn print_item` sorts them in natural order.
Before https://github.com/rust-lang/rust/pull/107765 the impls came in source order, which happened to be already sorted in the necessary way.
So the comparison function was called fewer times.
After https://github.com/rust-lang/rust/pull/107765 the impls came in "stable" order (based on def path hash).
So the comparison function was called more times to sort them.
The comparison function was terribly inefficient, so it caused a large perf regression.
This PR attempts to make it more efficient by using cached keys during sorting.
Shrink unicode case-mapping LUTs by 24k
I was looking into the binary bloat of a small program using `str::to_lowercase` and `str::to_uppercase`, and noticed that the lookup tables used for case mapping had a lot of zero-bytes in them. The reason for this is that since some characters map to up to three other characters when lower or uppercased, the LUTs store a `[char; 3]` for each character. However, the vast majority of cases only map to a single new character, in other words most of the entries are e.g. `(lowerc, [upperc, '\0', '\0'])`.
This PR introduces a new encoding scheme for these tables.
The changes reduces the size of my test binary by about 24K.
I've also done some `#[bench]`marks on unicode-heavy test data, and found that the performance of both `str::to_lowercase` and `str::to_uppercase` improves by up to 20%. These measurements are obviously very dependent on the character distribution of the data.
Someone else will have to decide whether this more complex scheme is worth it or not, I was just goofing around a bit and here's what came out of it 🤷♂️ No hard feelings if this isn't wanted!
rustdoc: add support for type filters in arguments and generics
This makes sense, since the search index has the information in it, and it's more useful for function signature searches since a function signature search's item type is, by definition, some type of function (there's more than one, but not very many).
Fix the ffi_unwind_calls lint documentation
This fixes the [`ffi_unwind_calls`](https://doc.rust-lang.org/nightly/rustc/lints/listing/allowed-by-default.html#ffi-unwind-calls) documentation to show its output correctly. Currently it is showing the text `{{produces}}` which is not how it should look.
This fixes it by not ignoring the example. I'm not sure why it was ignored, as the way the lint currently works it doesn't seem to require external linkage. This also fixes several mistakes in the example:
* There is no `ffi_unwind_calls` feature.
* Denies the lint (which is otherwise allow be default).
* Removes the `mod impl` which is not valid Rust syntax, and doesn't appear to be needed anyways.
The output now looks like:
```
warning: call to foreign function with FFI-unwind ABI
--> lint_example.rs:10:14
|
10 | unsafe { foo(); }
| ^^^^^ call to foreign function with FFI-unwind ABI
|
note: the lint level is defined here
--> lint_example.rs:2:9
|
2 | #![warn(ffi_unwind_calls)]
| ^^^^^^^^^^^^^^^^
warning: call to function pointer with FFI-unwind ABI
--> lint_example.rs:12:14
|
12 | unsafe { ptr(); }
| ^^^^^ call to function pointer with FFI-unwind ABI
```
This also includes some updates to the lint-docs tool to help with this issue:
* Adds a check if a lint documentation has `{{produces}}` with an ignored example, and generates an error.
* All instances of a lint are now displayed. Previously it only showed the first time the lint fires. Some examples may trigger a lint multiple times, and they are all now displayed.
Rollup of 7 pull requests
Successful merges:
- #108541 (Suppress `opaque_hidden_inferred_bound` for nested RPITs)
- #109137 (resolve: Querify most cstore access methods (subset 2))
- #109380 (add `known-bug` test for unsoundness issue)
- #109462 (Make alias-eq have a relation direction (and rename it to alias-relate))
- #109475 (Simpler checked shifts in MIR building)
- #109504 (Stabilize `arc_into_inner` and `rc_into_inner`.)
- #109506 (make param bound vars visibly bound vars with -Zverbose)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Fix cross-compiling with dlltool for raw-dylib
Fix for #103939
Issue Details:
When attempting to cross-compile using the `raw-dylib` feature and the GNU toolchain, rustc would attempt to find a cross-compiling version of dlltool (e.g., `i686-w64-mingw32-dlltool`). The has two issues 1) on Windows dlltool is always `dlltool` (no cross-compiling named versions exist) and 2) it only supported compiling to i686 and x86_64 resulting in ARM 32 and 64 compiling as x86_64.
Fix Details:
* On Windows always use the normal `dlltool` binary.
* Add the ARM64 cross-compiling dlltool name (support for this is coming: https://sourceware.org/bugzilla/show_bug.cgi?id=29964)
* Provide the `-m` argument to dlltool to indicate the target machine type.
(This is the first of two PRs to fix the remaining issues for the `raw-dylib` feature (#58713) that is blocking stabilization (#104218))
Make alias-eq have a relation direction (and rename it to alias-relate)
Emitting an "alias-eq" is too strict in some situations, since we don't always want strict equality between a projection and rigid ty. Adds a relation direction.
* I could probably just reuse this [`RelationDir`](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_infer/infer/combine/enum.RelationDir.html) -- happy to uplift that struct into middle and use that instead, but I didn't feel compelled to... 🤷
* Some of the matching in `compute_alias_relate_goal` is a bit verbose -- I guess I could simplify it by using [`At::relate`](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_infer/infer/at/struct.At.html#method.relate) and mapping the relation-dir to a variance.
* Alternatively, I coulld simplify things by making more helper functions on `EvalCtxt` (e.g. `EvalCtxt::relate_with_direction(T, T)` that also does the nested goal registration). No preference.
r? ```@lcnr``` cc ```@BoxyUwU``` though boxy can claim it if she wants
NOTE: first commit is all the changes, the second is just renaming stuff
Updates `interpret`, `codegen_ssa`, and `codegen_cranelift` to consume the new cast instead of the intrinsic.
Includes `CastTransmute` for custom MIR building, to be able to test the extra UB.
rustc: Remove unused `Session` argument from some attribute functions
(One auxiliary test file containing one of these functions was unused, so I removed it instead of updating.)
rustdoc: remove redundant `.content` prefix from span/a colors
Reverts a1d4ebe496, as well as fixing the problem it solved with links losing their color.
Ignore the vendor directory for tidy tests.
When running `x.py test` on a downloaded source distribution (e.g. https://static.rust-lang.org/dist/rustc-<version>-src.tar.gz), the crates in the vendor directory contain a number of executable files that cause the tidy test to fail with the following message:
tidy error: binary checked into source: <path>
I see 26 such errors with the 1.68.0 source distribution. A few of these are .rs source files with incorrect executable permission, but most are scripts that are correctly marked executable.
Set LLVM `LLVM_UNREACHABLE_OPTIMIZE` to `OFF`
This option was added to LLVM in https://reviews.llvm.org/D121750?id=416339. It makes `llvm_unreachable` in builds without assertions compile to an `LLVM_BUILTIN_TRAP` instead of `LLVM_BUILTIN_UNREACHABLE` (which causes undefined behavior and is equivalent to `std::hint::unreachable_unchecked`).
Having compiler bugs triggering undefined behavior generally seems undesirable and inconsistent with Rust's goals. There is a check in `src/tools/tidy/src/style.rs` to reject code using `llvm_unreachable`. But it is used a lot within LLVM itself.
For instance, this changes a failure I get compiling `libcore` for m68k from a `SIGSEGV` to `SIGILL`, which seems better though it still doesn't provide a useful message without switching to an LLVM build with asserts.
It may be best not to do this if it noticeably degrades compiler performance, but worthwhile if it doesn't do so in any significant way. I haven't looked into what benchmarks there are for Rustc. That should be considered before merging.
Detect uninhabited types early in const eval
r? `@RalfJung`
implements https://github.com/rust-lang/rust/pull/108442#discussion_r1143003840
this is a breaking change, as some UB during const eval is now detected instead of silently being ignored. Users can see this and other UB that may cause future breakage with `-Zextra-const-ub-checks` or just by running miri on their code, which sets that flag by default.
rustdoc: Cleanup parent module tracking for doc links
Keep ids of the documented items themselves, not their parent modules. Parent modules can be retreived from those ids when necessary.
Fixes https://github.com/rust-lang/rust/issues/108501.
That issue could be fixed in a more local way, but this refactoring is something that I wanted to do since https://github.com/rust-lang/rust/pull/93805 anyway.
refactor `fn bootstrap::builder::Builder::compiler_for` logic
- check compiler stage before forcing for stage2.
- check if download_rustc is not set before forcing for stage1.
resolves#109286
