naked_asm: emit a label starting with `func_end`
The `cargo asm` tool (`cargo install cargo-show-asm`) pattern matches on such labels to figure out where functions end: normal functions generated by LLVM always do have such a label. We don't guarantee that naked functions emit such a label, but having `cargo asm` work is convenient.
be45f67454/src/asm/statements.rs (L897-L901)
To make the label name unique it's suffixed with the name of the current symbol.
r? ```@Amanieu```
fix issue with `cmse-nonsecure-entry` ABI being both async and c-variadic
tracking issue: https://github.com/rust-lang/rust/issues/75835
fixes https://github.com/rust-lang/rust/issues/132142
An `extern "cmse-nonsecure-entry"` function cannot be c-variadic (or, in any case, clang/LLVM does not support it, see https://godbolt.org/z/MaPjzGcE1). So just stop looking at the type if we know it'll be invalid anyway.
I'm not entirely sure how to test this. The ICE is only possible on the `thumbv8m.main-none-eabi` and some related targets. I think using `minicore` is the most convenient, but use of `async` requires quite a long list of lang items to be present. Maybe we want that anyway though? On the other hand, it's extra `minicore` surface that might go out of date.
An alternative is `run-make`, that should work, but is much less convenient. See also [#t-compiler/help > `async fn` and `minicore`](https://rust-lang.zulipchat.com/#narrow/channel/182449-t-compiler.2Fhelp/topic/.60async.20fn.60.20and.20.60minicore.60/with/539427262).
r? `@ghost`
Fix and provide instructions for running test suite on Apple simulators
The following now works:
```sh
./x test --host='' --target aarch64-apple-ios-sim --skip tests/debuginfo
./x test --host='' --target aarch64-apple-tvos-sim --skip tests/debuginfo
./x test --host='' --target aarch64-apple-watchos-sim --skip tests/debuginfo
./x test --host='' --target aarch64-apple-visionos-sim --skip tests/debuginfo
```
I have documented the setup I used [in the `rustc-dev-guide`](https://rustc-dev-guide.rust-lang.org/tests/running.html#testing-on-emulators), it's fairly standard use of `remote-test-server` (with a small fix to library load paths which I've made in the first commit).
I first tried the somewhat simpler `target.aarch64-apple-ios-sim.runner = "xcrun simctl spawn $UDID"`, but that doesn't work as required libraries etc. also need to be copied to the device.
The debuginfo tests fail, I think because the debug info in `.dSYM` isn't available. I am yet unsure exactly how to fix this, either we need to copy that directory to the target as well, or we need to configure `lldb` somehow to read it from the host.
I decided to not add this to our CI, since I suspect we wouldn't gain much from it? Running on the simulator still uses the host Darwin kernel, it's basically just configured to run in another mode with more restricted permissions and different system libraries.
r? jieyouxu
CC ``@simlay,`` you're a lot more familiar with `xcrun simctl` than I.
The `cargo asm` tool pattern matches on such labels to figure out where functions end: normal functions generated by LLVM always do have such a label. We don't guarantee that naked functions emit such a label, but having `cargo asm` work is convenient
std: simplify host lookup
The logic for splitting up a string into a hostname and port is currently duplicated across (nearly) all of the networking implementations in `sys`. Since it does not actually rely on any system internals, this PR moves it to the `ToSocketAddr` implementation for `&str`, making it easier to discover and maintain.
On the other hand, the `ToSocketAddr` implementation (or rather the `resolve_socket_addr` function) contained logic to overwrite the port on the socket addresses returned by `LookupHost`, even though `LookupHost` is already aware of the port and sets the port already on Xous. This PR thus removes this logic by moving the responsibility of setting the port to the system-specific `LookupHost` implementation.
As a consequence of these changes, there remains only one way of creating `LookupHost`, hence I've removed the `TryFrom` implementations in favour of a `lookup_host` function, mirroring other, public iterator-based features.
And finally, I've simplified the parsing logic responsible for recognising IP addresses passed to `<(&str, u16)>::to_socket_addrs()` by using the `FromStr` impl of `IpAddr` rather than duplicating the parsing for both IP versions.
Add regression test for issue #91831
The requested test for rust-lang/rust#91831. I'm unsure about the filename, the file structure in `tests/ui/lifetimes/lifetime-errors/` isn't entirely clear to me. Any suggestions?
Closesrust-lang/rust#91831
c-variadic: allow c-variadic inherent and trait methods
tracking issue: https://github.com/rust-lang/rust/issues/44930
Continuing the work of https://github.com/rust-lang/rust/pull/146342, allow inherent and trait methods to be c-variadic. However, a trait that contains a c-variadic method is no longer dyn-compatible.
There is, presumably, some way to make c-variadic methods dyn-compatible. However currently, we don't have confidence that it'll work reliably: when methods from a `dyn` object are cast to a function pointer, a `ReifyShim` is created. If that shim is c-variadic, it would need to forward the C variable argument list.
That does appear to work, because the `va_list` is not represented in MIR at all in this case, so the registers from the call site are untouched by the shim and can be read by the actual implementation. That just does not seem like a solid implementation.
Also, intuitively, why would c-variadic function, primarily needed for FFI, need to be used with `dyn` objects at all? We can revisit this limitation if a need arises.
r? `@workingjubilee`
Prevent ABI changes affect EnzymeAD
This PR handles ABI changes for autodiff input arguments to improve Enzyme compatibility. Fundamentally this adjusts activities when a function argument is lowered as an `ScalarPair`, so there's no mismatch between diff activities and args. Also removes activities corresponding to ZSTs.
fixes: https://github.com/rust-lang/rust/issues/144025
r? `@ZuseZ4`
Lint more overlapping assignments in MIR.
In an effort to make bugs like https://github.com/rust-lang/rust/issues/146383 more easily discovered, this PR extends the "overlapping assignment" MIR lint.
I had to whitelist some rvalues, as they are actually allowed to alias, like `a = a + 1`.
Enable DestinationPropagation by default
This PR proposes to perform destination propagation on MIR. Most of the pass was fully rewritten by `@JakobDegen` in rust-lang/rust#96451.
This pass is quite heavy, as it needs to perform and save the results of a full liveness dataflow analysis. This accounts for ~50% of the pass' runtime.
Perf sees a few decent savings in later llvm passes, but also sizeable régressions when there are no savings to balance this pass' runtime.
tests/run-make: Update list of statically linked musl targets
All of the tier 3 targets in the list now link dynamically by default (except `mips64el-unknown-linux-muslabi64`, I apparently overlooked that one in my PR that changed this).
Adjust the list of targets expected to link statically accordingly.
See also https://github.com/rust-lang/rust/pull/144410, which changed these targets.
Target by target:
- `mips64-unknown-linux-musl`: this target does not exist AFAICT
- `mips64-unknown-linux-muslabi64`: updated in the linked PR
- `powerpc-unknown-linux-musl`: updated in the linked PR
- `powerpc-unknown-linux-muslspe`: updated in the linked PR
- `powerpc64-unknown-linux-musl`: updated in the linked PR
- `riscv32gc-unknown-linux-musl`: updated in the linked PR
- `s390x-unknown-linux-musl`: updated in the linked PR
- `thumbv7neon-unknown-linux-musleabihf`: updated in the linked PR
Detect attempt to use var-args in closure
```
error: unexpected `...`
--> $DIR/no-closure.rs:11:14
|
LL | let f = |...| {};
| ^^^ not a valid pattern
|
= note: only `extern "C"` and `extern "C-unwind"` functions may have a C variable argument list
error: unexpected `...`
--> $DIR/no-closure.rs:16:17
|
LL | let f = |_: ...| {};
| ^^^
|
= note: only `extern "C"` and `extern "C-unwind"` functions may have a C variable argument list
```
Fixrust-lang/rust#146489, when trying to use c-style var-args in a closure. We emit a more targeted message. We also silence inference errors when the pattern is `PatKind::Err`.
Remove Rvalue::Len again.
Now that we have `RawPtrKind::FakeForPtrMetadata`, we can reimplement `Rvalue::Len` using `PtrMetadata(&raw const (fake) place)`.
r? ``@scottmcm``
StateTransform: Do not renumber resume local.
MIR parameters are not explicitly assigned-to when entering the MIR body. If we want to save their values inside the coroutine state, we need to do so explicitly.
This was done by renaming the `_2` local, and introducing an explicit assignment pre-transform. This particular trick confuses me.
This version makes explicit that we are assigning parameters to saved locals.
r? ``@dingxiangfei2009``
don't apply temporary lifetime extension rules to non-extended `super let`
Reference PR: rust-lang/reference#1980
This changes the semantics for `super let` (and macros implemented in terms of it, such as `pin!`, `format_args!`, `write!`, and `println!`) as suggested by ````@theemathas```` in https://github.com/rust-lang/rust/issues/145784#issuecomment-3218658335, making `super let` initializers only count as [extending expressions](https://doc.rust-lang.org/nightly/reference/destructors.html#extending-based-on-expressions) when the `super let` itself is within an extending block. Since `super let` initializers aren't temporary drop scopes, their temporaries outside of inner temporary scopes are effectively always extended, even when not in extending positions; this only affects two cases as far as I can tell:
- Block tail expressions in Rust 2024. This PR makes `f(pin!({ &temp() }))` drop `temp()` at the end of the block in Rust 2024, whereas previously it would live until after the call to `f` because syntactically the `temp()` was in an extending position as a result of `super let` in `pin!`'s expansion.
- `super let` nested within a non-extended `super let` is no longer extended. i.e. a normal `let` is required to treat `super let`s as extending (in which case nested `super let`s will also be extending).
Closesrust-lang/rust#145784
This is a breaking change. Both static and dynamic semantics are affected. The most likely breakage is for programs to stop compiling, but it's technically possible for drop order to silently change as well (as in rust-lang/rust#145784). Since this affects stable macros, it probably would need a crater run.
Nominating for discussion alongside rust-lang/rust#145784: ````@rustbot```` label +I-lang-nominated +I-libs-api-nominated
Tracking issue for `super let`: rust-lang/rust#139076
initial implementation of the darwin_objc unstable feature
Tracking issue: https://github.com/rust-lang/rust/issues/145496
This feature makes it possible to reference Objective-C classes and selectors using the same ABI used by native Objective-C on Apple/Darwin platforms. Without it, Rust code interacting with Objective-C must resort to loading classes and selectors using costly string-based lookups at runtime. With it, these references can be loaded efficiently at dynamic load time.
r? ```@tmandry```
try-job: `*apple*`
try-job: `x86_64-gnu-nopt`
remove FIXME block from `has_significant_drop`, it never encounters inference variables
The `FIXME` block in `Ty::has_significant_drop` is outdated as related queries can now handle type inference.
321a89bec5/compiler/rustc_middle/src/ty/util.rs (L1378-L1389)Closesrust-lang/rust#86868 (other places mentioned in the issue have been resolved, or moved to other issues)
r? types
Update the minimum external LLVM to 20
With this change, we'll have stable support for LLVM 20 and 21.
For reference, the previous increase to LLVM 19 was rust-lang/rust#139275.
cc ```@rust-lang/wg-llvm```
r? nikic
Rollup of 5 pull requests
Successful merges:
- rust-lang/rust#146442 (Display ?Sized, const, and lifetime parameters in trait item suggestions across a crate boundary)
- rust-lang/rust#146474 (Improve `core::ascii` coverage)
- rust-lang/rust#146605 (Bump rustfix 0.8.1 -> 0.8.7)
- rust-lang/rust#146611 (bootstrap: emit hint if a config key is used in the wrong section)
- rust-lang/rust#146618 (Do not run ui test if options specific to LLVM are used when another codegen backend is used)
r? `@ghost`
`@rustbot` modify labels: rollup
Keep space if arg does not follow punctuation when lint unused parens
Fixesrust-lang/rust#138234
If the arg follows punctuation, still pass `left_pos` with `None` and no space will be added, else then pass `left_pos` with `Some(arg.span.lo())`, so that we can add the space as expected.
And `emit_unused_delims` can make sure no more space will be added if the expr follows space.
---
Edited:
Directly use the `value_span` to check whether the expr removed parens will follow identifier or be followed by identifier.
