defer opaque type errors, generally greatly reduce tainting
fixes the test for rust-lang/rust#135528, does not actually fix that issue properly.
This is useful as it causes the migration to rust-lang/rust#139587 to be a lot easier.
rustc_metadata: remove unused private trait impls
These are impls for non-reachable traits that don't appear to be used. Please let me know if there is value in keeping some of them for now.
cc `@cjgillot`
Escape diff strings in MIR dataflow graphviz
This uses `dot::escape_html` on diff strings so that `<` and `>` are properly escaped in MIR dataflow graphviz.
Previously the output could be malformed. For example, the graphviz for borrow check `MaybeInitializedPlaces` for the example in rust-lang/rust#145032 contained an unescaped `Fork<'_>`.
Couple of minor abi handling cleanups
These are extracted out of a wip branch I have to get rid of the `extern "unadjusted"` ABI for anything other than LLVM intrinsics.
Add annotations to the graphviz region graph on region origins
This adds
- `(ex<'e>)` for regions whose origin is existential, with name if one exists,
- `(for<'p>)` for regions whose origin is a placeholder, with name if one exists
For any region whose name we don't know, use `'_`.
This has helped _my_ debugging and it doesn't create too bad clutter, I feel.
The change ~~is~~was ridiculously small, but I turned it into a separate PR so we can bikeshed the format.
The following snippet:
```rust
struct Co<'a>(&'a ());
struct Contra<'a>(fn(&'a ()));
// `exists<'e> forall<'p> 'p: 'e` -> ERROR
fn p_outlives_e(
x: for<'e> fn(for<'p> fn(fn(fn(Contra<'e>, Co<'p>)))),
) -> fn(fn(fn(for<'unify> fn(Contra<'unify>, Co<'unify>)))) {
x
```
Gives this graph:
Remove unneeded `drop_in_place` calls
Might as well pull this out from rust-lang/rust#144561 because this is still used in things like `Vec::truncate` where it'd be nice to allow it be removed if inlined enough to see that the type is `Copy`.
So long as perf says it's ok, at least 🤞
coverage: Extract HIR-related helper code out of the main module
This is a decent chunk of helper code with a narrow external interface (one function returning one struct), making it a good candidate to be extracted out of the main `rustc_mir_transform::coverage` module.
No functional changes.
Add diagnostic explaining STATUS_STACK_BUFFER_OVERRUN not only being used for stack buffer overruns if link.exe exits with that exit code
`STATUS_STACK_BUFFER_OVERRUN` is also used for fast abnormal program termination, e.g. by abort(). Emit a special diagnostic to let people know that this most likely doesn't indicate a stack buffer overrun.
This doesn't look up the crash report in the event log to determine what the fast fail error code is. This is due to the way crashes are logged: When a process crash happens, the system logs an "Application Error" event, which contains the exit code and the process ID, but not the fast fail error code. A second event by Windows Error Reporting does contain that fast fail code, but not the process ID - but that event is not emitted at process exit, but when WER has dealt with it (on my system, it happens roughly two seconds later), so querying the code would have to read the `IntegratorReportId`, wait two seconds or potentially longer for the WER event with the same `ReportID`, and read out the code. (Also, that second event doesn't happen if WER is disabled.)
Fixesrust-lang/rust#100519.
add a scope for `if let` guard temporaries and bindings
This fixes my concern with `if let` guard drop order, namely that the guard's bindings and temporaries were being dropped after their arm's pattern's bindings, instead of before (https://github.com/rust-lang/rust/pull/141295#issuecomment-2968975596). The guard's bindings and temporaries now live in a new scope, which extends until (but not past) the end of the arm, guaranteeing they're dropped before the arm's pattern's bindings.
This only introduces a new scope for match arms with guards. Perf results (https://github.com/rust-lang/rust/pull/143376#issuecomment-3034922617) seemed to indicate there wasn't a significant hit to introduce a new scope on all match arms, but guard patterns (rust-lang/rust#129967) will likely benefit from only adding new scopes when necessary (with some patterns requiring multiple nested scopes).
Tracking issue for `if_let_guard`: rust-lang/rust#51114
Tests are adapted from examples by `@traviscross,` `@est31,` and myself on rust-lang/rust#141295.
Enable f16 and f128 on targets that were fixed in LLVM21
LLVM21 fixed the new float types on a number of targets:
* SystemZ gained f16 support https://github.com/llvm/llvm-project/pull/109164
* Hexagon now uses soft f16 to avoid recursion bugs https://github.com/llvm/llvm-project/pull/130977
* Mips now correctly handles f128 (actually since LLVM20) https://github.com/llvm/llvm-project/pull/117525
* f128 is now correctly aligned when passing the stack on x86 https://github.com/llvm/llvm-project/pull/138092
Thus, enable the types on relevant targets for LLVM > 21.0.0.
NVPTX also gained handling of f128 as a storage type, but it lacks support for basic math operations so is still disabled here.
try-job: dist-i586-gnu-i586-i686-musl
try-job: dist-i686-linux
try-job: dist-i686-msvc
try-job: dist-s390x-linux
try-job: dist-various-1
try-job: dist-various-2
try-job: dist-x86_64-linux
try-job: i686-gnu-1
try-job: i686-gnu-2
try-job: i686-msvc-1
try-job: i686-msvc-2
try-job: test-various
more strongly dissuade use of `skip_binder`
People unfortunately encounter `Binder` and `EarlyBinder` very early on when starting out. In these cases its often very easy to use `skip_binder` incorrectly. This makes it more explicit that it should generally not be used and points to the relevant `rustc-dev-guide` chapters.
r? `@BoxyUwU`
Account for bare tuples and `Pin` methods in field searching logic
When looking for the field names and types of a given type, account for tuples. This allows suggestions for incorrectly nested field accesses and field name typos to trigger as intended. Previously these suggestions only worked on `ty::Adt`, including tuple structs which are no different to tuples, so they should behave the same in suggestions.
When suggesting field access which would encounter a method not found, do not suggest pinning when those methods are on `impl Pin` itself.
```
error[E0599]: no method named `get_ref` found for tuple `(BufReader<File>,)` in the current scope
--> $DIR/missing-field-access.rs:11:15
|
LL | let x = f.get_ref();
| ^^^^^^^ method not found in `(BufReader<File>,)`
|
help: one of the expressions' fields has a method of the same name
|
LL | let x = f.0.get_ref();
| ++
```
instead of
```
error[E0599]: no method named `get_ref` found for tuple `(BufReader<File>,)` in the current scope
--> $DIR/missing-field-access.rs:11:15
|
LL | let x = f.get_ref();
| ^^^^^^^ method not found in `(BufReader<File>,)`
|
help: consider pinning the expression
|
LL ~ let mut pinned = std::pin::pin!(f);
LL ~ let x = pinned.as_ref().get_ref();
|
```
Fixrust-lang/rust#144602.
Implement declarative (`macro_rules!`) attribute macros (RFC 3697)
This implements [RFC 3697](https://github.com/rust-lang/rust/issues/143547), "Declarative (`macro_rules!`) attribute macros".
I would suggest reading this commit-by-commit. This first introduces the
feature gate, then adds parsing for attribute rules (doing nothing with them),
then adds the ability to look up and apply `macro_rules!` attributes by path,
then adds support for local attributes, then adds a test, and finally makes
various improvements to errors.
In rustc_pattern_analysis, put `true` witnesses before `false` witnesses
In rustc it doesn't really matter what the order of the witnesses is, but I'm planning to use the witnesses for implementing the "add missing match arms" assist in rust-analyzer, and there `true` before `false` is the natural order (like `Some` before `None`), and also what the current assist does.
The current order doesn't seem to be intentional; the code was created when bool ctors became their own thing, not just int ctors, but for integer, 0 before 1 is indeed the natural order.
r? `@Nadrieril`
atomicrmw on pointers: move integer-pointer cast hacks into backend
Conceptually, we want to have atomic operations on pointers of the form `fn atomic_add(ptr: *mut T, offset: usize, ...)`. However, LLVM does not directly support such operations (https://github.com/llvm/llvm-project/issues/120837), so we have to cast the `offset` to a pointer somewhere.
This PR moves that hack into the LLVM backend, so that the standard library, intrinsic, and Miri all work with the conceptual operation we actually want. Hopefully, one day LLVM will gain a way to represent these operations without integer-pointer casts, and then the hack will disappear entirely.
Cc ```@nikic``` -- this is the best we can do right now, right?
Fixes https://github.com/rust-lang/rust/issues/134617
Use `tcx.short_string()` in more diagnostics
`TyCtxt::short_string` ensures that user visible type paths aren't overwhelming on the terminal output, and properly saves the long name to disk as a side-channel. We already use these throughout the compiler and have been using them as needed when users find cases where the output is verbose. This is a proactive search of some cases to use `short_string`.
We add support for shortening the path of "trait path only".
Every manual use of `short_string` is a bright marker that that error should be using structured diagnostics instead (as they have proper handling of long types without the maintainer having to think abou tthem).
Teach the resolver to consider `macro_rules` macros when looking for a
local attribute. When looking for an attribute and considering a
`macro_rules` macro, load the macro in order to see if it has attribute
rules.
Include a FIXME about tracking multiple macro kinds for a Def instead.
Add infrastructure to apply an attribute macro given argument tokens and
body tokens.
Teach the resolver to consider `macro_rules` macros when looking for an
attribute via a path.
This does not yet handle local `macro_rules` attributes.
Rollup of 19 pull requests
Successful merges:
- rust-lang/rust#144400 (`tests/ui/issues/`: The Issues Strike Back [3/N])
- rust-lang/rust#144764 ([codegen] assume the tag, not the relative discriminant)
- rust-lang/rust#144807 (Streamline config in bootstrap)
- rust-lang/rust#144899 (Print CGU reuse statistics in `-Zprint-mono-items`)
- rust-lang/rust#144909 (Add new `test::print_merged_doctests_times` used by rustdoc to display more detailed time information)
- rust-lang/rust#144912 (Resolver: introduce a conditionally mutable Resolver for (non-)speculative resolution.)
- rust-lang/rust#144914 (Add support for `ty::Instance` path shortening in diagnostics)
- rust-lang/rust#144931 ([win][arm64ec] Fix msvc-wholearchive for Arm64EC)
- rust-lang/rust#144999 (coverage: Remove all unstable support for MC/DC instrumentation)
- rust-lang/rust#145009 (A couple small changes for rust-analyzer next-solver work)
- rust-lang/rust#145030 (GVN: Do not flatten derefs with ProjectionElem::Index. )
- rust-lang/rust#145042 (stdarch subtree update)
- rust-lang/rust#145047 (move `type_check` out of `compute_regions`)
- rust-lang/rust#145051 (Prevent name collisions with internal implementation details)
- rust-lang/rust#145053 (Add a lot of NLL `known-bug` tests)
- rust-lang/rust#145055 (Move metadata symbol export from exported_non_generic_symbols to exported_symbols)
- rust-lang/rust#145057 (Clean up some resolved test regressions of const trait removals in std)
- rust-lang/rust#145068 (Readd myself to review queue)
- rust-lang/rust#145070 (Add minimal `armv7a-vex-v5` tier three target)
r? `@ghost`
`@rustbot` modify labels: rollup
Add minimal `armv7a-vex-v5` tier three target
This PR adds minimal, `no_std` support for the VEX V5 Brain, a robotics microcontroller used in educational contexts. In comparison to rust-lang/rust#131530, which aimed to add this same target, these changes are limited in scope to the compiler.
## Tier 3 Target Policy Compliance
> A tier 3 target must have a designated developer or developers (the "target maintainers") on record to be CCed when issues arise regarding the target. (The mechanism to track and CC such developers may evolve over time.)
Lewis McClelland (`@lewisfm),` `@Tropix126,` Gavin Niederman (`@Gavin-Niederman),` and Max Niederman (`@max-niederman)` will be the designated maintainers for `armv7a-vex-v5` support.
> Targets must use naming consistent with any existing targets; for instance, a target for the same CPU or OS as an existing Rust target should use the same name for that CPU or OS. Targets should normally use the same names and naming conventions as used elsewhere in the broader ecosystem beyond Rust (such as in other toolchains), unless they have a very good reason to diverge. Changing the name of a target can be highly disruptive, especially once the target reaches a higher tier, so getting the name right is important even for a tier 3 target.
`armv7a-vex-v5` follows the cpu-vendor-model convention used by most tier three targets. For example: `armv76k-nintendo-3ds` or `armv7k-apple-watchos`.
> Target names should not introduce undue confusion or ambiguity unless absolutely necessary to maintain ecosystem compatibility. For example, if the name of the target makes people extremely likely to form incorrect beliefs about what it targets, the name should be changed or augmented to disambiguate it.
> If possible, use only letters, numbers, dashes and underscores for the name. Periods (.) are known to cause issues in Cargo.
This target name is not confusing.
> Tier 3 targets may have unusual requirements to build or use, but must not create legal issues or impose onerous legal terms for the Rust project or for Rust developers or users.
It's using open source tools only.
> The target must not introduce license incompatibilities.
>
> Anything added to the Rust repository must be under the standard Rust license (MIT OR Apache-2.0).
Understood.
> The target must not cause the Rust tools or libraries built for any other host (even when supporting cross-compilation to the target) to depend on any new dependency less permissive than the Rust licensing policy. This applies whether the dependency is a Rust crate that would require adding new license exceptions (as specified by the tidy tool in the rust-lang/rust repository), or whether the dependency is a native library or binary. In other words, the introduction of the target must not cause a user installing or running a version of Rust or the Rust tools to be subject to any new license requirements.
There are no new dependencies/features required in the current state of this target. Porting the standard library will likely require depending on the crate `vex-sdk` which is MIT-licensed and contains bindings to the VEX SDK runtime (which is included in VEXos).
> Compiling, linking, and emitting functional binaries, libraries, or other code for the target (whether hosted on the target itself or cross-compiling from another target) must not depend on proprietary (non-FOSS) libraries. Host tools built for the target itself may depend on the ordinary runtime libraries supplied by the platform and commonly used by other applications built for the target, but those libraries must not be required for code generation for the target; cross-compilation to the target must not require such libraries at all. For instance, rustc built for the target may depend on a common proprietary C runtime library or console output library, but must not depend on a proprietary code generation library or code optimization library. Rust's license permits such combinations, but the Rust project has no interest in maintaining such combinations within the scope of Rust itself, even at tier 3.
>
> "onerous" here is an intentionally subjective term. At a minimum, "onerous" legal/licensing terms include but are not limited to: non-disclosure requirements, non-compete requirements, contributor license agreements (CLAs) or equivalent, "non-commercial"/"research-only"/etc terms, requirements conditional on the employer or employment of any particular Rust developers, revocable terms, any requirements that create liability for the Rust project or its developers or users, or any requirements that adversely affect the livelihood or prospects of the Rust project or its developers or users.
Although the VEX V5 Brain and its SDK are proprietary, this target does not link to any proprietary binaries or libraries, and is based solely on publicly available information about the VEX SDK.
> Neither this policy nor any decisions made regarding targets shall create any binding agreement or estoppel by any party. If any member of an approving Rust team serves as one of the maintainers of a target, or has any legal or employment requirement (explicit or implicit) that might affect their decisions regarding a target, they must recuse themselves from any approval decisions regarding the target's tier status, though they may otherwise participate in discussions.
>
> This requirement does not prevent part or all of this policy from being cited in an explicit contract or work agreement (e.g. to implement or maintain support for a target). This requirement exists to ensure that a developer or team responsible for reviewing and approving a target does not face any legal threats or obligations that would prevent them from freely exercising their judgment in such approval, even if such judgment involves subjective matters or goes beyond the letter of these requirements.
I understand.
> Tier 3 targets should attempt to implement as much of the standard libraries as possible and appropriate (core for most targets, alloc for targets that can support dynamic memory allocation, std for targets with an operating system or equivalent layer of system-provided functionality), but may leave some code unimplemented (either unavailable or stubbed out as appropriate), whether because the target makes it impossible to implement or challenging to implement. The authors of pull requests are not obligated to avoid calling any portions of the standard library on the basis of a tier 3 target not implementing those portions.
This initial PR only contains a compiler target definition to teach the `cc` crate about this target. Porting the standard library is the next step for this target.
> The target must provide documentation for the Rust community explaining how to build for the target, using cross-compilation if possible. If the target supports running binaries, or running tests (even if they do not pass), the documentation must explain how to run such binaries or tests for the target, using emulation if possible or dedicated hardware if necessary.
This target is documented in `src/doc/rustc/src/platform-support/armv7a-vex-v5.md`.
> Tier 3 targets must not impose burden on the authors of pull requests, or other developers in the community, to maintain the target. In particular, do not post comments (automated or manual) on a PR that derail or suggest a block on the PR based on a tier 3 target. Do not send automated messages or notifications (via any medium, including via `@)` to a PR author or others involved with a PR regarding a tier 3 target, unless they have opted into such messages.
>
> Backlinks such as those generated by the issue/PR tracker when linking to an issue or PR are not considered a violation of this policy, within reason. However, such messages (even on a separate repository) must not generate notifications to anyone involved with a PR who has not requested such notifications.
I understand and assent.
> Patches adding or updating tier 3 targets must not break any existing tier 2 or tier 1 target, and must not knowingly break another tier 3 target without approval of either the compiler team or the maintainers of the other tier 3 target.
>
> In particular, this may come up when working on closely related targets, such as variations of the same architecture with different features. Avoid introducing unconditional uses of features that another variation of the target may not have; use conditional compilation or runtime detection, as appropriate, to let each target run code supported by that target.
I understand and assent.
> Tier 3 targets must be able to produce assembly using at least one of rustc's supported backends from any host target. (Having support in a fork of the backend is not sufficient, it must be upstream.)
`armv7a-vex-v5` has nearly identical codegen to `armv7a-none-eabihf`, so this is not an issue.
> If a tier 3 target stops meeting these requirements, or the target maintainers no longer have interest or time, or the target shows no signs of activity and has not built for some time, or removing the target would improve the quality of the Rust codebase, we may post a PR to remove it; any such PR will be CCed to the target maintainers (and potentially other people who have previously worked on the target), to check potential interest in improving the situation.
I understand.
