Return values larger than 2 registers using a return area pointer
LLVM and Cranelift disagree about how to return values that don't fit in the registers designated for return values. LLVM will force the entire return value to be passed by return area pointer, while Cranelift will look at each IR level return value independently and decide to pass it in a register or not, which would result in the return value being passed partially in registers and partially through a return area pointer.
While Cranelift may need to be fixed as the LLVM behavior is generally more correct with respect to the surface language, forcing this behavior in rustc itself makes it easier for other backends to conform to the Rust ABI and for the C ABI rustc already handles this behavior anyway.
In addition LLVM's decision to pass the return value in registers or using a return area pointer depends on how exactly the return type is lowered to an LLVM IR type. For example `Option<u128>` can be lowered as `{ i128, i128 }` in which case the x86_64 backend would use a return area pointer, or it could be passed as `{ i32, i128 }` in which case the x86_64 backend would pass it in registers by taking advantage of an LLVM ABI extension that allows using 3 registers for the x86_64 sysv call conv rather than the officially specified 2 registers.
This adjustment is only necessary for the Rust ABI as for other ABI's the calling convention implementations in rustc_target already ensure any return value which doesn't fit in the available amount of return registers is passed in the right way for the current target.
Helps with https://github.com/rust-lang/rustc_codegen_cranelift/issues/1525
cc https://github.com/bytecodealliance/wasmtime/issues/9250
Make `profiler_builtins` an optional dependency of sysroot, not std
This avoids unnecessary rebuilds of std (and the compiler) when `build.profiler` is toggled off or on.
Fixes#131812.
---
Background: The `profiler_builtins` crate has been an optional dependency of std (behind a cargo feature) ever since it was added back in #42433. But as far as I can tell that has only ever been a convenient way to force the crate to be built, not a genuine dependency.
The side-effect of this false dependency is that toggling `build.profiler` causes a rebuild of std and the compiler, which shouldn't be necessary. This PR therefore makes `profiler_builtins` an optional dependency of the dummy sysroot crate (#108865), rather than a dependency of std.
What makes this change so small is that all of the necessary infrastructure already exists. Previously, bootstrap would enable the `profiler` feature on the sysroot crate, which would forward that feature to std. Now, enabling that feature directly enables sysroot's `profiler_builtins` dependency instead.
---
I believe this is more of a bootstrap change than a libs change, so tentatively:
r? bootstrap
internal: Fix editorconfig glob
Had been testing Zed's editorconfig branch on r-a and noticed that something was odd with yaml files.
https://spec.editorconfig.org/#glob-expressions
> {s1,s2,s3}
> any of the strings given (separated by commas, can be nested) (But {s1} only matches {s1} literally.)
LSP says about Position::character
> If the character value is greater than the line length it defaults back to the line length.
but from_proto::offset() doesn't implement this.
A client might for example request code actions for a whole line by sending
Position::character=99999. I don't think there is ever a reason (besides laziness) why the
client can't specify the line length instead but I guess we should not crash but follow protocol.
Technically it should be a warning, not an error but warning is not shown by default so keep
it at error I guess.
Fixes#18240
internal: fix lldb-dap unconditionally calling rustc
Fixes https://github.com/rust-lang/rust-analyzer/issues/18318. I also took the opportunity to refactor how `discoverSourceFileMap` worked—it now returns a type instead of mutating a map in place.
I tested this change using the LLDB DAP extension. I needed to set `"lldb-dap.executable-path": "/Applications/Xcode.app/Contents/Developer/usr/bin/lldb-dap"` for everything to work, however, but once I did, was able to successfully debug a test.
Clamp Position::character to line length
LSP says about Position::character
> If the character value is greater than the line length it defaults back to the line length.
but from_proto::offset() doesn't implement this.
A client might for example request code actions for a whole line by sending
Position::character=99999. I don't think there is ever a reason (besides laziness) why the
client can't specify the line length instead but I guess we should not crash but follow protocol.
Not sure how to update Cargo.lock (lib/README.md doesn't say how).
Fixes#18240
Avoid superfluous UB checks in `IndexRange`
`IndexRange::len` is justified as an overall invariant, and
`take_prefix` and `take_suffix` are justified by local branch
conditions. A few more UB-checked calls remain in cases that are only
supported locally by `debug_assert!`, which won't do anything in
distributed builds, so those UB checks may still be useful.
We generally expect core's `#![rustc_preserve_ub_checks]` to optimize
away in user's release builds, but the mere presence of that extra code
can sometimes inhibit optimization, as seen in #131563.
optimize str.replace
Adds a fast path for str.replace for the ascii to ascii case. This allows for autovectorizing the code. Also should this instead be done with specialization? This way we could remove one branch. I think it is the kind of branch that is easy to predict though.
Benchmark for the fast path (replace all "a" with "b" in the rust wikipedia article, using criterion) :
| N | Speedup | Time New (ns) | Time Old (ns) |
|----------|---------|---------------|---------------|
| 2 | 2.03 | 13.567 | 27.576 |
| 8 | 1.73 | 17.478 | 30.259 |
| 11 | 2.46 | 18.296 | 45.055 |
| 16 | 2.71 | 17.181 | 46.526 |
| 37 | 4.43 | 18.526 | 81.997 |
| 64 | 8.54 | 18.670 | 159.470 |
| 200 | 9.82 | 29.634 | 291.010 |
| 2000 | 24.34 | 81.114 | 1974.300 |
| 20000 | 30.61 | 598.520 | 18318.000 |
| 1000000 | 29.31 | 33458.000 | 980540.000 |
Make destructors on `extern "C"` frames to be executed
This would make the example in #123231 print "Noisy Drop". I didn't mark this as fixing the issue because the behaviour is yet to be spec'ed.
Tracking:
- https://github.com/rust-lang/rust/issues/74990
internal: Use local time when formatting logs
When debugging rust-analyzer and looking at logs, it's much easier to read when the timestamp is in the local timezone.
Before:
2024-08-28T20:55:38.792321Z INFO ParseQuery: invoked at R18460
After:
2024-08-28T13:55:38.792321-07:00 INFO ParseQuery: invoked at R18460
When debugging rust-analyzer and looking at logs, it's much easier to read
when the timestamp is in the local timezone.
Before:
2024-08-28T20:55:38.792321Z INFO ParseQuery: invoked at R18460
After:
2024-08-28T13:55:38.792321-07:00 INFO ParseQuery: invoked at R18460
fix: incorrect autofix for missing wrapped unit in return expr
fix#18298.
We should insert `Ok(())` or `Some(())` instead of wrapping `return` with variants.
minor: `ra-salsa` in `profile.dev.package`
Since `ra-salsa`'s package name is actually `salsa` it makes the following warning in `cargo` commands;
```
warning: profile package spec `ra-salsa` in profile `dev` did not match any packages
```
and the opt level isn't applied to it.
chore: rename `salsa` to `ra_salsa`
Laying some groundwork to start before I import the new Salsa crate. Here's why:
1. As part of the migration, `@darichey,` `@Wilfred,` and I will create new Salsa equivalents of the existing databases/query groups. We'll get them to compile crate-by-crate.
2. Once we wrote all equivalents of all queries, we'd start to refactor usage sites of the vendored Salsa to use the new Salsa databases.
3. Starting porting usage sites of old Salsa to the new Salsa.
4. Remove the vendored `ra_salsa`; declare victory.
internal: switch remaining OpQueues to use named structs
Building atop of https://github.com/rust-lang/rust-analyzer/pull/18195, I switched `GlobalState::fetch_build_data_queue` to use a struct instead of a tuple.
(I didn't switch `fetch_proc_macros_queue` to not return a bool, as the return value is only used in one spot.)
feat: respect references.exclude_tests in call-hierarchy
close#18212
### Changes
1. feat: respect `references.exclude_tests` in call-hierarchy
2. Modified the description of `references.exclude_tests`
