copy the correct version of LLVM into the stage0 sysroot
In some cases(see https://github.com/rust-lang/rust/issues/109314), when the stage0
compiler relies on more recent version of LLVM than the beta compiler, it may not
be able to locate the correct LLVM in the sysroot. This situation typically occurs
when we upgrade LLVM version while the beta compiler continues to use an older version.
Fixes#109314
Extract a create_wrapper_function for use in allocator shim writing
This deduplicates some logic and makes it easier to follow what wrappers are produced. In the future it may allow moving the code to determine which wrappers to create to cg_ssa.
Respect `#[expect]` the same way `#[allow]` is with the `dead_code` lint
This PR makes the `#[expect]` attribute being respected in the same way the `#[allow]` attribute is with the `dead_code` lint.
The fix is much more involved than I would have liked (and it's not because I didn't tried!), because the implementation took advantage of the fact that firing a lint in a allow context is a nop (for the user, as the lint is suppressed) to not fire-it at all.
And will it's fine for `#[allow]`, it definitively isn't for `#[expect]`, as the presence and absence of the lint is significant. So a big part of the PR is just adding the context information of whenever an item is on the worklist because of an `[allow]`/`#[expect]` or not.
Fixes https://github.com/rust-lang/rust/issues/114557
Tell LLVM that the negation in `<*const T>::sub` cannot overflow
Today it's just `sub` <https://rust.godbolt.org/z/8EzEPnMr5>; with this PR it's `sub nsw`.
miri: implement some `llvm.x86.sse.*` intrinsics and add tests
PR moved from https://github.com/rust-lang/rust/pull/113932.
Implements LLVM intrisics needed to run most SSE functions from `core::arch::x86{,_64}`.
Also adds miri tests for those functions (mostly copied from core_arch tests).
r? `@RalfJung`
The first commit is the same that the commit in the PR I had opened in the Rust repository. I addressed review comments in additional commits to make it easier to review. I also fixed formatting and clippy warnings.
reduce deps for windows-msvc targets for backtrace
(eventually) mirrors https://github.com/rust-lang/backtrace-rs/pull/543
Some dependencies of backtrace don't used on windows-msvc targets, so exclude them:
miniz_oxide (+ adler)
addr2line (+ gimli)
object (+ memchr)
This saves about 30kb of std.dll + 17.5mb of rlibs
make `typeid::typeid_itanium_cxx_abi::transform_ty` evaluate length in array types
the ICE in https://github.com/rust-lang/rust/issues/114275 was caused by `transform_ty`
in compiler/rustc_symbol_mangling/src/typeid/typeid_itanium_cxx_abi.rs encountering an unevaluated const, while expecting it to already be evaluated.
coverage: Don't convert filename/symbol strings to `CString` for FFI
LLVM APIs are usually perfectly happy to accept pointer/length strings, as long as we supply a suitable length value when creating a `StringRef` or `std::string`.
This lets us avoid quite a few intermediate `CString` copies during coverage codegen. It also lets us use an `IndexSet<Symbol>` (instead of an `IndexSet<CString>`) when building the deduplicated filename table.
The default value for maxBuffer is 1 MiB[1]. If the discover project
command returns stdout or stderr that is greater than 1 MiB, the
extension would error with "RangeError: stderr maxBuffer length
exceeded".
Set the default value for maxBuffer to 10 MiB for project discovery.
[1] https://nodejs.org/api/child_process.html#child_processexeccommand-options-callback
Add support for tidy linting via external tools for non-rust files
This change adds the flag `--check-extras` to `tidy`. It accepts a comma separated list of any of the options:
* py (test everything applicable for python files)
* py:lint (lint python files using `ruff`)
* py:fmt (check formatting for python files using `black`)
* shell or shell:lint (lint shell files using `shellcheck`)
Specific files to check can also be specified via positional args. Examples:
* `./x test tidy --check-extras=shell,py`
* `./x test tidy --check-extras=py:fmt -- src/bootstrap/bootstrap.py`
* `./x test tidy --check-extras=shell -- src/ci/*.sh`
* Python formatting can be applied with bless: `./x test tidy --ckeck-extras=py:fmt --bless`
`ruff` and `black` need to be installed via pip; this tool manages these within a virtual environment at `build/venv`. `shellcheck` needs to be installed on the system already.
---
This PR doesn't fix any of the errors that show up (I will likely go through those at some point) and it doesn't enforce anything new in CI. Relevant zulip discussion: https://rust-lang.zulipchat.com/#narrow/stream/242791-t-infra/topic/Other.20linters.20in.20CI
Rollup of 6 pull requests
Successful merges:
- #110435 (rustdoc-json: Add test for field ordering.)
- #111891 (feat: `riscv-interrupt-{m,s}` calling conventions)
- #114377 (test_get_dbpath_for_term(): handle non-utf8 paths (fix FIXME))
- #114469 (Detect method not found on arbitrary self type with different mutability)
- #114587 (Convert Const to Allocation in smir)
- #114670 (Don't use `type_of` to determine if item has intrinsic shim)
Failed merges:
- #114599 (Add impl trait declarations to SMIR)
r? `@ghost`
`@rustbot` modify labels: rollup
Don't use `type_of` to determine if item has intrinsic shim
When we're calling `resolve_instance` on an inline const, we were previously looking at the `type_of` for that const, seeing that it was an `extern "intrinsic"` fn def, and treating it as if we were computing the instance of that intrinsic itself. This is incorrect.
Instead, we should be using the def-id of the item we're computing to determine if it's an intrinsic.
Fixes#114660
Detect method not found on arbitrary self type with different mutability
```
error[E0599]: no method named `x` found for struct `Pin<&S>` in the current scope
--> $DIR/arbitrary_self_type_mut_difference.rs:11:18
|
LL | Pin::new(&S).x();
| ^ help: there is a method with a similar name: `y`
|
note: method is available for `Pin<&mut S>`
--> $DIR/arbitrary_self_type_mut_difference.rs:6:5
|
LL | fn x(self: Pin<&mut Self>) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
```
Related to #57994, as one of the presented cases can lead to code like this.
test_get_dbpath_for_term(): handle non-utf8 paths (fix FIXME)
Removes a FIXME for #9639
Part of #44366 which is E-help-wanted
The remaining two FIXMEs for #9639 are considerably more complicated, so I will create separate PRs for them.
feat: `riscv-interrupt-{m,s}` calling conventions
Similar to prior support added for the mips430, avr, and x86 targets this change implements the rough equivalent of clang's [`__attribute__((interrupt))`][clang-attr] for riscv targets, enabling e.g.
```rust
static mut CNT: usize = 0;
pub extern "riscv-interrupt-m" fn isr_m() {
unsafe {
CNT += 1;
}
}
```
to produce highly effective assembly like:
```asm
pub extern "riscv-interrupt-m" fn isr_m() {
420003a0: 1141 addi sp,sp,-16
unsafe {
CNT += 1;
420003a2: c62a sw a0,12(sp)
420003a4: c42e sw a1,8(sp)
420003a6: 3fc80537 lui a0,0x3fc80
420003aa: 63c52583 lw a1,1596(a0) # 3fc8063c <_ZN12esp_riscv_rt3CNT17hcec3e3a214887d53E.0>
420003ae: 0585 addi a1,a1,1
420003b0: 62b52e23 sw a1,1596(a0)
}
}
420003b4: 4532 lw a0,12(sp)
420003b6: 45a2 lw a1,8(sp)
420003b8: 0141 addi sp,sp,16
420003ba: 30200073 mret
```
(disassembly via `riscv64-unknown-elf-objdump -C -S --disassemble ./esp32c3-hal/target/riscv32imc-unknown-none-elf/release/examples/gpio_interrupt`)
This outcome is superior to hand-coded interrupt routines which, lacking visibility into any non-assembly body of the interrupt handler, have to be very conservative and save the [entire CPU state to the stack frame][full-frame-save]. By instead asking LLVM to only save the registers that it uses, we defer the decision to the tool with the best context: it can more accurately account for the cost of spills if it knows that every additional register used is already at the cost of an implicit spill.
At the LLVM level, this is apparently [implemented by] marking every register as "[callee-save]," matching the semantics of an interrupt handler nicely (it has to leave the CPU state just as it found it after its `{m|s}ret`).
This approach is not suitable for every interrupt handler, as it makes no attempt to e.g. save the state in a user-accessible stack frame. For a full discussion of those challenges and tradeoffs, please refer to [the interrupt calling conventions RFC][rfc].
Inside rustc, this implementation differs from prior art because LLVM does not expose the "all-saved" function flavor as a calling convention directly, instead preferring to use an attribute that allows for differentiating between "machine-mode" and "superivsor-mode" interrupts.
Finally, some effort has been made to guide those who may not yet be aware of the differences between machine-mode and supervisor-mode interrupts as to why no `riscv-interrupt` calling convention is exposed through rustc, and similarly for why `riscv-interrupt-u` makes no appearance (as it would complicate future LLVM upgrades).
[clang-attr]: https://clang.llvm.org/docs/AttributeReference.html#interrupt-risc-v
[full-frame-save]: 9281af2ecf/src/lib.rs (L440-L469)
[implemented by]: b7fb2a3fec/llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp (L61-L67)
[callee-save]: 973f1fe7a8/llvm/lib/Target/RISCV/RISCVCallingConv.td (L30-L37)
[rfc]: https://github.com/rust-lang/rfcs/pull/3246
