Fix e_flags for 32-bit MIPS targets in generated object file
In #95604 the compiler started generating a temporary symbols.o which is added to the linker invocation. This object file has an `e_flags` which is invalid for 32-bit MIPS targets. Even though symbols.o doesn't contain code, linking these targets with [lld fails](https://github.com/llvm/llvm-project/blob/main/lld/ELF/Arch/MipsArchTree.cpp#L76-L79) with
```
rust-lld: error: foo-cgu.0.rcgu.o: ABI 'o32' is incompatible with target ABI 'n64'
```
because it omits the ABI bits (`EF_MIPS_ABI_O32`) so lld assumes it's using the N64 ABI. This breaks linking on nightly for the out-of-tree [mipsel-sony-psx target](https://github.com/ayrtonm/psx-sdk-rs/issues/9), the builtin mipsel-sony-psp target (cc `@overdrivenpotato)` and probably any other 32-bit MIPS target using lld.
This PR sets the ABI in `e_flags` to O32 since that's the only ABI for 32-bit MIPS that LLVM supports. It also sets other `e_flags` bits based on the target to avoid similar issues with the object file arch and PIC. I had to bump the object crate version since some of these constants were [added recently](https://github.com/gimli-rs/object/pull/433). I'm not sure if this PR needs a test, but I can confirm that it fixes the linking issue on both targets I mentioned.
Gracefully handle normalization failures in the prospective inliner cycle detector
Preliminary work for adding the regression test in #96950 to our test suite (it was flaky on glacier).
If this PR solves the flakiness on glacier, we can then merge #96950
Add test of matches macro for trailing commas
Almost all macros are tested for trailing commas.
The macro matches! was however not tested.
This PR adds that test case.
Related to #46238
Clarify what values `BorrowedHandle`, `OwnedHandle` etc. can hold.
Reword the documentation to clarify that when `BorrowedHandle`, `OwnedHandle`, or `HandleOrNull` hold the value `-1`, it always means the current process handle, and not `INVALID_HANDLE_VALUE`.
`-1` should only mean `INVALID_HANDLE_VALUE` after a call to a function documented to return that to report errors, which should lead I/O functions to produce errors rather than succeeding and producing `OwnedHandle` or `BorrowedHandle` values. So if a consumer of an `OwnedHandle` or `BorrowedHandle` ever sees them holding a `-1`, it should always mean the current process handle.
Add compiletest and bootstrap "--skip" option forwarded to libtest
With this PR, "x.py test --skip SKIP ..." will run the specified test suite, but forward "--skip SKIP" to the test tool. libtest already supports this option. The PR also adds it to compiletest which itself just forwards it to libtest.
Adds the functionality requested in https://github.com/rust-lang/rust/issues/96342. This is useful to work around tests broken upstream.
https://github.com/rust-lang/rust/issues/96362#issuecomment-1108609893 is the specific test issue my project is trying to work around.
openbsd: convert futex timeout managment to Timespec usage
unbreak openbsd build after #96657
r? cuviper
please note I made `Timespec::zero()` public to be able to use it. OpenBSD is using relative timeout for `futex(2)` and I don't find simple way to use `Timespec` this way.
don't encode only locally used attrs
Part of https://github.com/rust-lang/compiler-team/issues/505.
We now filter builtin attributes before encoding them in the crate metadata in case they should only be used in the local crate. To prevent accidental misuse `get_attrs` now requires the caller to state which attribute they are interested in. For places where that isn't trivially possible, I've added a method `fn get_attrs_unchecked` which I intend to remove in a followup PR.
After this pull request landed, we can then slowly move all attributes to only be used in the local crate while being certain that we don't accidentally try to access them from extern crates.
cc https://github.com/rust-lang/rust/pull/94963#issuecomment-1082924289
diagnostics: port more diagnostics to derive + support for `()` fields
- Extend diagnostic derive so that spanless subdiagnostics (e.g. some uses of `help`/`note`) can be applied via attributes to fields of type `()` (currently spanless subdiagnostics are applied via attributes on the diagnostic struct itself). A consequence of this is that `Option<()>` fields can be used to represent optional spanless subdiagnostics, which are sometimes useful (e.g. for a `help` that should only show on nightly builds).
- Simplify the "explicit generic args with impl trait" diagnostic struct (from #96760) using support for `Option<()>` spanless subdiagnostics.
- Change `DiagnosticBuilder::set_arg`, used to provide context for Fluent messages, so that it takes anything that implements `IntoDiagnosticArg`, rather than `DiagnosticArgValue` - this improves the ergonomics of manual implementations of `SessionDiagnostic` which are translatable.
- Port "the type parameter `T` must be explicitly specified", "manual implementations of `X` are experimental", "could not resolve substs on overridden impl" diagnostics to diagnostic structs.
- When testing macros from `rustc_macros` in `ui-fulldeps` tests, sometimes paths from the compiler source tree can be shown in error messages - these need to be normalized in `compiletest`.
r? `@oli-obk`
cc `@pvdrz`
Port the "the type parameter `T` must be explicitly specified"
diagnostic to using a diagnostic struct.
Signed-off-by: David Wood <david.wood@huawei.com>
Manual implementors of translatable diagnostics will need to call
`set_arg`, not just the derive, so make this function a bit more
ergonomic by taking `IntoDiagnosticArg` rather than
`DiagnosticArgValue`.
Signed-off-by: David Wood <david.wood@huawei.com>
When testing macros from `rustc_macros` in `ui-fulldeps` tests,
sometimes paths from the compiler source tree can be shown in error
messages - these need to be normalized.
Signed-off-by: David Wood <david.wood@huawei.com>
Using new support for spanless subdiagnostics from `()` fields in the
diagnostic derive, simplify the "explicit generic args with impl trait"
diagnostic's struct.
Signed-off-by: David Wood <david.wood@huawei.com>
Type attributes could previously be used to support spanless
subdiagnostics but these couldn't easily be made optional in the same
way that spanned subdiagnostics could by using a field attribute on a
field with an `Option<Span>` type. Spanless subdiagnostics can now be
specified on fields with `()` type or `Option<()>` type.
Signed-off-by: David Wood <david.wood@huawei.com>
Remove `PartialOrd`/`Ord` impl for `PlaceRef`
This is a new attempt at #93315. It removes one usage
of the `Ord` impl for `DefId`, which should make it easier
to eventually remove that impl.
Add `sub_ptr` on pointers (the `usize` version of `offset_from`)
We have `add`/`sub` which are the `usize` versions of `offset`, this adds the `usize` equivalent of `offset_from`. Like how `.add(d)` replaced a whole bunch of `.offset(d as isize)`, you can see from the changes here that it's fairly common that code actually knows the order between the pointers and *wants* a `usize`, not an `isize`.
As a bonus, this can do `sub nuw`+`udiv exact`, rather than `sub`+`sdiv exact`, which can be optimized slightly better because it doesn't have to worry about negatives. That's why the slice iterators weren't using `offset_from`, though I haven't updated that code in this PR because slices are so perf-critical that I'll do it as its own change.
This is an intrinsic, like `offset_from`, so that it can eventually be allowed in CTFE. It also allows checking the extra safety condition -- see the test confirming that CTFE catches it if you pass the pointers in the wrong order.
