refactor: replace `LLVMRustAtomicLoad/Store` with LLVM built-in functions
This simplifies the code and reduces the burden of maintaining our own wrappers.
Work towards https://github.com/rust-lang/rust/issues/46437
some more `proc_macro` cleanups
Several smaller cleanups to `proc_macro`. Commits 1 and 3 seem pretty trivial to me, commit 2 might be worth it or not.
Followup to rust-lang/rust#147166.
clarify wording of match ergonomics diagnostics (`rust_2024_incompatible_pat` lint and error)
Partially addresses rust-lang/rust#143557:
- Uses different wording than the Edition Guide chapter, to hopefully stand alone a bit better. Instead of referring to the "default binding mode", it now talks about what can't be written "within elided reference patterns". I ended up going with "elided" instead of "implicit" in hope that it reads bit less like it should behave the same as an explicit reference pattern, but I'm not totally happy with that wording.
- The explanatory note still points to where the default binding mode was introduced, but only refers to its effect, not what we call it. How that relates to the rest of the diagnostic may still be a bit of a puzzle, but hopefully it isn't too much of one? It also doesn't make sense anymore for the case of `&` written under a by-ref binding mode, so I've left the note out in that case (but kept the label). It's more cramped, but talking about binding modes would feel like a non-sequitur for the error about `&` patterns without further explanation.
- Links to the stable version of the Edition Guide instead of the nightly version. It looks like almost every link to the Edition Guide in diagnostics is to the nightly version, presumably for the same reason as here: the diagnostics were added before the new Edition was stabilized, then never updated. I'll make a separate PR to clean up the others.
This only changes the diagnostic messages, not the code suggestion or the Edition Guide.
r? `@Nadrieril` or reassign
sort attribute targets for more consistent error messages
In this PR I noticed that we don't sort attribute targets, so a rather trivial change to the source changed the ordering in an error message even though its meaning stayed the same.
See: https://github.com/rust-lang/rust/pull/147418#discussion_r2410852750
I think sorting might be a good thing to do in general. I also prefer it when reading error messages. Quite a few tests changed, but not in meaning, only sorting order obviously.
r? `@jieyouxu`
Use globals instead of metadata for std::autodiff
LLVM's Metadata is quite fragile. In debug builds we use incremental compilation, which caused the metadata to be dropped. With this change we use named globals instead of metadata to instruct Enzyme how to differentiate functions.
Globals are proper llvm values and thus can't be dropped. Also added an incremental/dbg test which now passes, to unblock the EnzymeAD CI which wants to run Rust autodiff tests.
r? compiler
`DepNodeColor` tweaks
A follow-up to rust-lang/rust#147293, where I attempted and mostly failed to make things faster again, but I found a few cleanups worth doing.
r? `@saethlin`
rename `select_where_possible` and `select_all_or_error`
r? `@lcnr`
I find that people get confused by what these methods do. The verb "select" is not really that helpful and is just a reference to somewhat of an implementation detail of the trait solvers that doesn't even apply to most obligation kinds.
I went with `try_evaluate_obligations` and `evaluate_obligations_error_on_ambiguity`. This maintains consistency with the new solvers `evalute_goal` entry point. it's unfortunate that we say obligations rather than goals but this maintains consistency with `register_obligation` functions which I think is a good thing. In the long term possibly we rename `Obligation` or `Goal` 🤷♀️
Rollup of 8 pull requests
Successful merges:
- rust-lang/rust#146865 (kcfi: only reify trait methods when dyn-compatible)
- rust-lang/rust#147205 (Add a new `wasm32-wasip3` target to Rust)
- rust-lang/rust#147322 (cg_llvm: Consistently import `llvm::Type` and `llvm::Value`)
- rust-lang/rust#147398 (Fix; correct placement of type inference error for method calls)
- rust-lang/rust#147410 (Update `S-waiting-on-team` refs to new `S-waiting-on-{team}` labels)
- rust-lang/rust#147422 (collect-license-metadata: Print a diff of the expected output)
- rust-lang/rust#147431 (compiletest: Read the whole test file before parsing directives)
- rust-lang/rust#147433 (Fix doc comment)
Failed merges:
- rust-lang/rust#147390 (Use globals instead of metadata for std::autodiff)
r? `@ghost`
`@rustbot` modify labels: rollup
compiletest: Read the whole test file before parsing directives
Few tests are larger than a handful of kilobytes, and nowadays we scan the whole file for directives anyway, so there's little reason not to just read the whole thing up-front.
This avoids having to deal with I/O within `iter_directives`, which should make it easier to overhaul directive processing.
r? jieyouxu
collect-license-metadata: Print a diff of the expected output
Previously, `x test collect-license-metadata` gave the following message on errors:
```
gathering license information from REUSE (this might take a minute...)
finished gathering the license information from REUSE in 78.69s
loading existing license information
The existing /home/runner/work/ferrocene/ferrocene/license-metadata.json
file is out of date.
Run ./x run collect-license-metadata to update it.
Error: The existing
/home/runner/work/ferrocene/ferrocene/license-metadata.json file doesn't
match what REUSE reports.
Bootstrap failed while executing `test collect-license-metadata`
```
Notable, this doesn't actually say what went wrong. Print a diff in addition so it's more clear what broke:
```
...
"license": {
"copyright": [
+ "2010 The Rust Project Developers",
"2016, 2017, 2018, 2019, 2020, 2021 AXE Consultants. All Rights",
+ "License. Subject to the terms and conditions of this",
"Notice",
- "The Ferrocene Developers"
+ "The Ferrocene Developers",
+ "[yyyy] [name of copyright owner]"
],
...
```
Currently, this prints the entire text of the JSON file as context. That's not ideal, but it's rare for this to fail, so I think it's ok for now.
I considered using `assert_json_diff` instead of `similar`, but its errors are a lot harder to read IMO, even though they are better at omitting unnecessary context:
```
Diff: json atoms at path ".files.children[0].children[10].license.copyright[0]" are not equal:
lhs:
"2016 The Fuchsia Authors"
rhs:
"2019 The Crossbeam Project Developers"
json atoms at path ".files.children[0].children[10].license.spdx" are not equal:
lhs:
"BSD-2-Clause AND (Apache-2.0 OR MIT)"
rhs:
"Apache-2.0 OR MIT"
json atom at path ".files.children[0].children[10].children" is missing from lhs
json atoms at path ".files.children[0].children[10].name" are not equal:
lhs:
"library/std/src/sys/sync/mutex/fuchsia.rs"
rhs:
"library/std/src/sync/mpmc"
...
```
cg_llvm: Consistently import `llvm::Type` and `llvm::Value`
We already have other modules that import these types and other types from `llvm`, so having the re-exports `type_::Type` and `value::Value` just distracts rust-analyzer and results in messier and less-consistent imports.
No functional change.
Add a new `wasm32-wasip3` target to Rust
This commit adds a new tier 3 target to rustc, `wasm32-wasip3`. This follows in the footsteps of the previous `wasm32-wasip2` target and is used to represent binding to the WASIp3 set of APIs managed by the WASI subgroup to the WebAssembly Community Group.
As of now the WASIp3 set of APIs are not finalized nor standardized. They're in the process of doing so and the current trajectory is to have the APIs published in December of this year. The goal here is to get the wheels turning in Rust to have the target in a
more-ready-than-nonexistent state by the time this happens in December.
For now the `wasm32-wasip3` target looks exactly the same as `wasm32-wasip2` except that `target_env = "p3"` is specified. This indicates to crates in the ecosystem that WASIp3 APIs should be used, such as the [`wasip3` crate]. Over time this target will evolve as implementation in guest toolchains progress, notably:
* The standard library will use WASIp3 APIs natively once they're finalized in the WASI subgroup.
* Support through `wasi-libc` will be updated to use WASIp3 natively which Rust will then transitively use.
* Longer-term, features such as cooperative multithreading will be added to the WASIp3-track of targets to enable using `std::thread`, for example, on this target.
These changes are all expected to be non-breaking changes for users of this target. Runtimes supporting WASIp3, currently Wasmtime and Jco, support WASIp2 APIs as well and will work with components whether or not they import WASIp2, both WASIp2 and WASIp3, or just WASIp3 APIs. This means that changing the internal implementation details of libstd over time is expected to be a non-breaking change.
[`wasip3` crate]: https://crates.io/crates/wasip3
kcfi: only reify trait methods when dyn-compatible
fixes https://github.com/rust-lang/rust/issues/146853
Only generate a `ReifyShim` for trait method calls if the trait is dyn-compatible.
Until now kcfi would generate a `ReifyShim` whenever a trait method was cast to a function pointer. But technically the shim is only needed for dyn-compatible traits (where the method might end up in a vtable).
Up to this point that was only slightly inefficient, but in combination with c-variadic trait methods it is wrong. For c-variadic trait methods the generated shim is incorrect, and that is why c-variadic methods make a trait no longer dyn-compatible: we should simply never generate a `ReifyShim` that is c-variadic.
With this change the documentation on `ReifyReason` is now actually correct:
> If KCFI is enabled, creating a function pointer from a method on a dyn-compatible trait. This includes the case of converting `::call`-like methods on closure-likes to function pointers.
cc ```@maurer``` ```@workingjubilee```
r? ```@rcvalle```
Rollup of 7 pull requests
Successful merges:
- rust-lang/rust#145943 (stdlib docs: document lifetime extension for `format_args!`'s arguments)
- rust-lang/rust#147243 (cmse: disallow `impl Trait` in `cmse-nonsecure-entry` return types)
- rust-lang/rust#147402 ([rustdoc] Don't serialize & deserialize data that doesn't go OTW)
- rust-lang/rust#147418 (Fix target list of `link_section`)
- rust-lang/rust#147429 (Print tip for human error format in runtest)
- rust-lang/rust#147441 (Fix comments error for Provenance impls)
- rust-lang/rust#147442 (c-variadic: fix thir-print for `...` without a pattern)
r? `@ghost`
`@rustbot` modify labels: rollup
Print tip for human error format in runtest
When working on https://github.com/rust-lang/rust/pull/147354, spent some time to figure out that there is `//~ ERROR` left on test file, this PR will give a better error message for this scenario.
cmse: disallow `impl Trait` in `cmse-nonsecure-entry` return types
tracking issue: https://github.com/rust-lang/rust/issues/75835
fixes https://github.com/rust-lang/rust/issues/147242
Refactors some logic to be more robust in the future, and then disallows `impl Trait` as a return type for the cmse ABIs.
The `is_valid_cmse_output_layout` function disallows `union` values like before. That is not entirely correct, but preserves the current behavior. Some additional logic is needed for `union` values (and any types where parts may be uninitialized) that I'll tackle in a later PR.
can be reviewed commit-by-commit.
r? types
stdlib docs: document lifetime extension for `format_args!`'s arguments
Since rust-lang/rust#140748 is stable and rust-lang/rust#92698 is closed, the section about `format_args!`'s argument lifetime limitation is outdated. I've updated it to point to the Reference docs, which will specify lifetime extension rules for builtin macros once rust-lang/reference#1980 or equivalent is merged.
I've also taken the liberty of updating one of the doctests to assign the result of `format_args!` to a variable, both to provide an example and because I think it reads a little better.
r? `@m-ou-se`
Prevent downstream `impl DerefMut for Pin<LocalType>`
The safety requirements for [`PinCoerceUnsized`](https://doc.rust-lang.org/stable/std/pin/trait.PinCoerceUnsized.html) are essentially that the type does not have a malicious `Deref` or `DerefMut` impl. However, the `Pin` type is fundamental, so the end-user can provide their own implementation of `DerefMut` for `Pin<&SomeLocalType>`, so it's possible for `Pin` to have a malicious `DerefMut` impl. This unsoundness is known as rust-lang/rust#85099.
Unfortunately, this means that the implementation of `PinCoerceUnsized` for `Pin` is currently unsound. To fix that, modify the impl so that it becomes impossible for downstream crates to provide their own implementation of `DerefMut` for `Pin` by abusing a hidden struct that is not fundamental.
This PR is a breaking change, but it fixesrust-lang/rust#85099. The PR supersedes rust-lang/rust#144896.
r? lcnr
