Refactor: remove unnecessary string searchings
This patch removes unnecessary string searchings for checking if function arguments have `&` and `&mut`.
Revert "Revert "Allow dynamic linking for iOS/tvOS targets.""
This reverts commit 16e10bf81e (PR #77716).
The original original PR enabled `cdylib` builds for iOS. However this caused problems because:
> This new feature in Rust 1.46 added a lot of headache for iOS builds with cdylib targets. cdylib target is near impossible to build if you are using any crate with native dependencies (ex. openssl, libsodium, zmq). You can't just find .so files for all architectures to perform correct linking. Usual workflow is the following:
>
> 1. You build staticlib and rely that native dependencies will be linked as frameworks later
> 2. You setup right cocoapods in ObjectiveC/Swift wrapper.
>
> As cargo doesn't support platform-dependent crate types https://github.com/rust-lang/rust/pull/4881 as a result a lot of projects now broken on Rust 1.46
However, this will be soon a thing of the past since 1.64 brings us the long awaited much anticipated `--crate-type` flag.
> I see that this got merged recently: https://github.com/rust-lang/cargo/issues/10083. The --crate-type flag will get stabilized in 1.64. In 1.64, you could still get a successful iOS staticlib with cargo build --crate-type=statclib even if the crate has cdylib targets too. If I'm not mistaken, this solves the problem too so this PR could be reverted in 1.64 with relatively little headache.
So summing up, I think this PR can be reverted in 1.64. 🤞
Reenable disabled early syntax gates as future-incompatibility lints
- MCP: https://github.com/rust-lang/compiler-team/issues/535
The approach taken by this PR is
- Introduce a new lint, `unstable_syntax_pre_expansion`, and reenable the early syntax gates to emit it
- Use the diagnostic stashing mechanism to stash warnings the early warnings
- When the hard error occurs post expansion, steal and cancel the early warning
- Don't display any stashed warnings if errors are present to avoid the same noise problem that hiding type ascription errors is avoiding
Commits are working commits, but in a coherent steps-to-implement manner. Can be squashed if desired.
The preexisting `soft_unstable` lint seems like it would've been a good fit, but it is deny-by-default (appropriate for `#[bench]`) and these gates should be introduced as warn-by-default.
It may be desirable to change the stash mechanism's behavior to not flush lint errors in the presence of other errors either (like is done for warnings here), but upgrading a stash-using lint from warn to error perhaps is enough of a request to see the lint that they shouldn't be hidden; additionally, fixing the last error to get new errors thrown at you always feels bad, so if we know the lint errors are present, we should show them.
Using a new flag/mechanism for a "weak diagnostic" which is suppressed by other errors may also be desirable over assuming any stashed warnings are "weak," but this is the first user of stashing warnings and seems an appropriate use of stashing (it follows the "know more later to refine the diagnostic" pattern; here we learn that it's in a compiled position) so we get to define what it means to stash a non-hard-error diagnostic.
cc `````@petrochenkov````` (seconded MCP)
Make `same_type_modulo_infer` a proper `TypeRelation`
Specifically, this fixes#100690 because we no longer consider a `ReLateBound` and a `ReVar` to be equal. `ReVar` can only be equal to free regions or static.
Add the diagnostic translation lints to crates that don't emit them
Some of these have a note saying that they should build on a stable compiler, does that mean they shouldn't get these lints? Or can we cfg them out on those?
Migrate "invalid variable declaration" errors to SessionDiagnostic
After seeing the great blog post on Inside Rust, I decided to try my hand at this. Just one diagnostic for now to get used to the workflow and to check if this is the way to do it or if there are any problems.
suggest `once_cell::Lazy` for non-const statics
Addresses https://github.com/rust-lang/rust/issues/100410
Some questions:
- removing the `if` seems to include too many cases (e.g. calls to non-const functions inside a `const fn`), but this code excludes the following case:
```rust
const FOO: Foo = non_const_fn();
```
Should we suggest `once_cell` in this case as well?
- The original issue mentions suggesting `AtomicI32` instead of `Mutex<i32>`, should this PR address that as well?
Mention `as_mut` alongside `as_ref` in borrowck error message
Kinda fixes#99426 but I guess that really might be better staying open to see if we could make it suggest `as_mut` in a structured way. Not sure how to change borrowck to know that info tho.
Rollup of 9 pull requests
Successful merges:
- #99576 (Do not allow `Drop` impl on foreign fundamental types)
- #100081 (never consider unsafe blocks unused if they would be required with deny(unsafe_op_in_unsafe_fn))
- #100208 (make NOP dyn casts not require anything about the vtable)
- #100494 (Cleanup rustdoc themes)
- #100522 (Only check the `DefId` for the recursion check in MIR inliner.)
- #100592 (Manually implement Debug for ImportKind.)
- #100598 (Don't fix builtin index when Where clause is found)
- #100721 (Add diagnostics lints to `rustc_type_ir` module)
- #100731 (rustdoc: count deref and non-deref as same set of used methods)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Lazily decode SourceFile from metadata
Currently, source files from foreign crates are decoded up-front from metadata.
Spans from those crates were matched with the corresponding source using binary search among those files.
This PR changes the strategy by matching spans to files during encoding. This allows to decode source files on-demand, instead of up-front. The on-disk format for spans becomes: `<tag> <position from start of file> <length> <file index> <crate (if foreign file)>`.
Don't fix builtin index when Where clause is found
Where clause shadows blanket impl for `Index` which causes normalization to not occur, which causes ICE to happen when we typeck.
r? `@compiler-errors`
Fixes#91633
never consider unsafe blocks unused if they would be required with deny(unsafe_op_in_unsafe_fn)
Judging from https://github.com/rust-lang/rust/issues/71668#issuecomment-1200317370 the consensus nowadays seems to be that we should never consider an unsafe block unused if it was required with `deny(unsafe_op_in_unsafe_fn)`, no matter whether that lint is actually enabled or not. So let's adjust rustc accordingly.
The first commit does the change, the 2nd does some cleanup.
Do not allow `Drop` impl on foreign fundamental types
`Drop` should not be implemented on `Pin<T>` even if `T` is local.
This does not trigger regular orphan rules is because `Pin` is `#[fundamental]`... but we don't allow specialized `Drop` impls anyways, so these rules are not sufficient to prevent this impl on stable. Let's just choose even stricter rules, since we shouldn't be implementing `Drop` on a foreign ADT ever.
Fixes#99575
rustc_metadata: dedupe strings to prevent multiple copies in rmeta/query cache blow file size
r? `@cjgillot`
Encodes strings in rmeta/query cache so duplicated ones will be encoded as offsets to first strings, reducing file size.
Revert "Rollup merge of #97346 - JohnTitor:remove-back-compat-hacks, …
…r=oli-obk"
This reverts commit c703d11dcc, reversing
changes made to 64eb9ab869.
it didn't apply cleanly, so now it works the same for RPIT and for TAIT instead of just working for RPIT, but we should keep those in sync anyway. It also exposed a TAIT bug (see the feature gated test that now ICEs).
r? `@pnkfelix`
fixes#99536
Stabilize the `-Csplit-debuginfo` flag...
- ...on Linux for all values of the flag. Split DWARF has been
implemented for a few months, hasn't had any bug reports and has had
some promising benchmarking for incremental debug build performance.
- ..on other platforms for the default value. It doesn't make any sense
that `-Csplit-debuginfo=packed` is unstable on Windows MSVC when
that's the default behaviour, but keep the other values unstable.
Signed-off-by: David Wood <david.wood@huawei.com>
Don't derive `PartialEq::ne`.
Currently we skip deriving `PartialEq::ne` for C-like (fieldless) enums
and empty structs, thus reyling on the default `ne`. This behaviour is
unnecessarily conservative, because the `PartialEq` docs say this:
> Implementations must ensure that eq and ne are consistent with each other:
>
> `a != b` if and only if `!(a == b)` (ensured by the default
> implementation).
This means that the default implementation (`!(a == b)`) is always good
enough. So this commit changes things such that `ne` is never derived.
The motivation for this change is that not deriving `ne` reduces compile
times and binary sizes.
Observable behaviour may change if a user has defined a type `A` with an
inconsistent `PartialEq` and then defines a type `B` that contains an
`A` and also derives `PartialEq`. Such code is already buggy and
preserving bug-for-bug compatibility isn't necessary.
Two side-effects of the change:
- There is only one error message produced for types where `PartialEq`
cannot be derived, instead of two.
- For coverage reports, some warnings about generated `ne` methods not
being executed have disappeared.
Both side-effects seem fine, and possibly preferable.
Migrate lint reports in typeck::check_unused to LintDiagnostic
In this PR, I migrate two lint reports in `typeck::check_unused` by `LintDiagnostic`, all of which is about extern crates.
```@rustbot``` label +A-translation
r? rust-lang/diagnostics
Fix documentation of rustc_parse::parser::Parser::parse_stmt_without_recovery
Something seems to have gotten out of sync during the creation of #81177, where both the argument and comment were introduced.
Migrations for rustc_expand transcribe.rs
This PR includes some migrations to the new diagnostics API for the `rustc_expand` module.
r? ```@davidtwco```
avoid assertion failures in try_to_scalar_int
Given that this is called `try_to_scalar_int`, we probably shouldn't `assert_int` here. Similarly `try_to_bits` also doesn't `assert!` that the size is correct.
Also add some `track_caller` for debugging, while we are at it.
r? ```@oli-obk```
Make must_not_suspend lint see through references when drop tracking is enabled
See #97333.
With drop tracking enabled, sometimes values that were previously linted are now considered dropped and not linted. This change makes must_not_suspend traverse through references to still catch these values.
Unfortunately, this leads to duplicate warnings in some cases (e.g. [dedup.rs](9a74608543/src/test/ui/lint/must_not_suspend/dedup.rs (L4))), so we only use the new behavior when drop tracking is enabled.
cc ``@guswynn``
Remove deferred sized checks (make them eager)
Improves diagnostics spans... this doesn't seem to be the case anymore:
```rust
// Some additional `Sized` obligations badly affect type inference.
// These obligations are added in a later stage of typeck.
pub(super) deferred_sized_obligations:
RefCell<Vec<(Ty<'tcx>, Span, traits::ObligationCauseCode<'tcx>)>>,
```
Migrate emoji identifier diagnostics to `SessionDiagnostic` in rustc_interface
* Migrate emoji identifier diagnostics to `interface_ferris_identifier` and `interface_emoji_identifier`.
This is my first PR! I'm learning how to migrate these diagnostics. Thanks in advance.
r? rust-lang/diagnostics
Pass +atomics-32 feature for {arm,thumb}v4t-none-eabi
Similar to 89582e8193, but for ARMv4t.
Pre-v6 ARM target does not have atomic CAS, except for Linux and Android where atomic CAS is provided by compiler-builtins. So, there is a similar issue as thumbv6m.
I have confirmed that enabling the `atomics-32` target feature fixes the problem in the project affected by this issue. (https://github.com/taiki-e/portable-atomic/pull/28#discussion_r946604136)
Closes#100619
r? ``@nikic``
cc ``@Lokathor``
Do not report cycle error when inferring return type for suggestion
The UI test is a good example of a case where this happens. The cycle is due to needing the value of the return type `-> _` to compute the variances of items in the crate, but then needing the variances of the items in the crate to do typechecking to infer what `-> _`'s real type is.
Since we're already gonna emit an error in astconv, just delay the cycle bug as an error.
triagebot: add translation-related mention groups
- Move some code around so that triagebot can ping relevant parties when translation logic is modified.
- Add mention groups to triagebot for translation-related files/folders.
- Auto-label pull requests with changes to translation-related files/folders with `A-translation`.
r? `@Mark-Simulacrum`
No functional changes intended.
LLVM commit 633f5663c3 removed `createWriteThinLTOBitcodePass`.
This adapts PassWrapper similarly to the example mentioned upstream: 633f5663c3.
Support 128-bit atomics on all aarch64 targets
Some aarch64 targets currently set `max_atomic_width` to 64, but aarch64 always supports 128-bit atomics.
r? `@Amanieu`
Fix nonsense non-tupled `Fn` trait error
Given this code:
```rust
#![feature(unboxed_closures)]
fn a<F: Fn<usize>>(f: F) {}
fn main() {
a(|_: usize| {});
}
```
We currently emit this error:
```
error[E0631]: type mismatch in closure arguments
--> src/main.rs:6:5
|
6 | a(|_: usize| {});
| ^ ---------- found signature of `fn(usize) -> _`
| |
| expected signature of `fn(usize) -> _`
|
note: required by a bound in `a`
--> src/main.rs:3:9
|
3 | fn a<F: Fn<usize>>(f: F) {}
| ^^^^^^^^^ required by this bound in `a`
For more information about this error, try `rustc --explain E0631`.
error: could not compile `playground` due to previous error
```
Notably, it says the same thing for "expected" and "found"!
Fix the output so that we instead emit:
```
error[E0308]: mismatched types
--> /home/gh-compiler-errors/test.rs:6:5
|
6 | a(|_: usize| {});
| ^ types differ
|
= note: expected trait `Fn<usize>`
found trait `Fn<(usize,)>`
note: required by a bound in `a`
--> /home/gh-compiler-errors/test.rs:3:9
|
3 | fn a<F: Fn<usize>>(f: F) {}
| ^^^^^^^^^ required by this bound in `a`
error: aborting due to previous error
```
The error could still use some work, namely the "mismatched types" part, but I'm leaving it a bit rough since the only way you'd ever get this error is when you're messing with `#![feature(unboxed_closures)]`.
Simply making sure we actually print out the difference in trait-refs is good enough for me. I could probably factor in some additional improvements if those are desired.
Rollup of 6 pull requests
Successful merges:
- #100338 (when there are 3 or more return statements in the loop)
- #100384 (Add support for generating unique profraw files by default when using `-C instrument-coverage`)
- #100460 (Update the minimum external LLVM to 13)
- #100567 (Add missing closing quote)
- #100590 (Suggest adding an array length if possible)
- #100600 (Rename Machine memory hooks to suggest when they run)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Rename Machine memory hooks to suggest when they run
Some of the other memory hooks start with `before_` or `after_` to indicate that they run before or after a certain operation. These don't, so I was a bit confused as to when they are supposed to run.
`memory_read` can be read two ways in English, "memory was read" or "this is a memory read" so without the prefix this was especially ambiguous.
Update the minimum external LLVM to 13
With this change, we'll have stable support for LLVM 13 through 15 (pending release).
For reference, the previous increase to LLVM 12 was #90175.
r? `@nagisa`
Add support for generating unique profraw files by default when using `-C instrument-coverage`
Currently, enabling the rustc flag `-C instrument-coverage` instruments the given crate and by default uses the naming scheme `default.profraw` for any instrumented profile files generated during the execution of a binary linked against this crate. This leads to multiple binaries being executed overwriting one another and causing only the last executable run to contain actual coverage results.
This can be overridden by manually setting the environment variable `LLVM_PROFILE_FILE` to use a unique naming scheme.
This PR adds a change to add support for a reasonable default for rustc to use when enabling coverage instrumentation similar to how the Rust compiler treats generating these same `profraw` files when PGO is enabled.
The new naming scheme is set to `default_%m_%p.profraw` to ensure the uniqueness of each file being generated using [LLVMs special pattern strings](https://clang.llvm.org/docs/SourceBasedCodeCoverage.html#running-the-instrumented-program).
Today the compiler sets the default for PGO `profraw` files to `default_%m.profraw` to ensure a unique file for each run. The same can be done for the instrumented profile files generated via the `-C instrument-coverage` flag as well which LLVM has API support for.
Linked Issue: https://github.com/rust-lang/rust/issues/100381
r? `@wesleywiser`
when there are 3 or more return statements in the loop
emit the first 3 errors and duplicated diagnostic information
modified: compiler/rustc_typeck/src/check/coercion.rs
new file: src/test/ui/typeck/issue-100285.rs
new file: src/test/ui/typeck/issue-100285.stderr
- Rename `ast::Lit::token` as `ast::Lit::token_lit`, because its type is
`token::Lit`, which is not a token. (This has been confusing me for a
long time.)
reasonable because we have an `ast::token::Lit` inside an `ast::Lit`.
- Rename `LitKind::{from,to}_lit_token` as
`LitKind::{from,to}_token_lit`, to match the above change and
`token::Lit`.
There is some redundancy here, but the extra assertions make it easier
to keep track of relative things, e.g. `ExprKind` is the biggest part
of `Expr`.
Remove manual implementations of HashStable for hir::Expr and hir::Ty.
We do not need to force hashing HIR bodies inside those nodes. The contents of bodies are not accessible from the `hir_owner` query which used `hash_without_bodies`. When the content of a body is required, the access is still done using `hir_owner_nodes`, which continues hashing HIR bodies.
emit the first 3 errors and duplicated diagnostic information
using take of iterator for the first third return
modified: compiler/rustc_typeck/src/check/coercion.rs
new file: src/test/ui/typeck/issue-100285.rs
new file: src/test/ui/typeck/issue-100285.stderr
Support 1st group of RISC-V Bitmanip backend target features
These target features use the same names as LLVM and `is_riscv_feature_detected!`, they are:
- zba (address generation instructions)
- zbb (basic bit manipulation)
- zbc (carry-less multiplication)
- zbs (single-bit manipulation)
The extension is frozen and ratified, and I don't think we should expect LLVM to change those feature names in the future.
For reference, the specification for the B extension can be found here: https://github.com/riscv/riscv-bitmanip/releases/download/1.0.0/bitmanip-1.0.0-38-g865e7a7.pdf)
On my current project, I see a 7.6% reduction in binary size with these features on, so I have some incentive to try to silence the "unknown feature" warning from `-Ctarget-feature` =)
Adjust span of fn argument declaration
Span of a fn argument declaration goes from:
```
fn foo(i : i32 , ...)
^^^^^^^^
```
to:
```
fn foo(i : i32 , ...)
^^^^^^^
```
That is, we don't include the extra spacing up to the trailing comma, which I think is more correct.
cc https://github.com/rust-lang/rust/pull/99646#discussion_r944568074
r? ``@estebank``
---
The two tests that had dramatic changes in their rendering I think actually are improved, though they are kinda poor spans both before and after the changes. 🤷 Thoughts?
Replace - with _ in fluent slugs to improve developer workflows
This is a proposal to smoothen the compiler contribution experience in the face of the move to fluent.
## Context
The fluent project has introduced a layer of abstraction to compiler errors. Previously, people would write down error messages directly in the same file the code was located to emit them. Now, there is a slug that connects the code in the compiler to the error message in the ftl file.
You can look at 7ef610c003 to see an example of the changes:
Old:
```Rust
let msg = format!(
"bounds on `{}` are most likely incorrect, consider instead \
using `{}` to detect whether a type can be trivially dropped",
predicate,
cx.tcx.def_path_str(needs_drop)
);
lint.build(&msg).emit();
```
New (Rust side):
```Rust
lint.build(fluent::lint::drop_trait_constraints)
.set_arg("predicate", predicate)
.set_arg("needs_drop", cx.tcx.def_path_str(needs_drop))
.emit();
```
New (Fluent side):
```fluent
lint-drop-trait-constraints =
bounds on `{$predicate}` are most likely incorrect, consider instead using `{$needs_drop}` to detect whether a type can be trivially dropped
```
You will note that in the ftl file, the slug is slightly different from the slug in the Rust file: The ftl slug uses `-` (e.g. `lint-drop-trait-constraints`) while the rust slug uses `::` and `_` (e.g. `lint::drop_trait_constraints`). This choice was probably done due to:
* Rust not accepting `-` in identifiers (as it is an operator)
* fluent not supporting the `:` character in slug names (parse error upon attempts)
* all official fluent documentation using `-` instead of `_`
## The problem
The two different types of slugs, one with `-`, and one with `_`, cause difficulties for contributors. Imagine you don't have perfect knowledge of where stuff is in the compiler (i would say this is most people), and you encounter an error for which you think there is something you could improve that is not just a rewording.
So you want to find out where in the compiler's code that error is being emitted. The best way is via grepping.
1. you grep for the message in the compiler's source code. You discover the ftl file and find out the slug for that error.
2. That slug however contains `-` instead of `_`, so you have to manually translate the `-`'s into `_`s, and furthermore either remove the leading module name, or replace the first `-` with a `::`.
3. you do a second grep to get to the emitting location in the compiler's code.
This translation difficulty in step 2 appears also in the other direction when you want to figure out what some code in the compiler is doing and use error messages to help your understanding. Comments and variable names are way less exposed to users so [are more likely going to lie](cc3c5d2700) than error messages.
I think that at least the `-`→`_` translation which makes up most of step 2 can be removed at low cost.
## The solution
If you look closely, the practice of fluent to use `-` is only a stylistic choice and it is not enforced by fluent implementations, neither the playground nor the one the rust compiler uses, that slugs may not contain `_`. Thus, we can in fact migrate the ftl side to `_`. So now we'll have slugs like `lint_drop_trait_constraints` on the ftl side. You only have to do one replacement now to get to the Rust slug: remove the first `_` and place a `::` in its stead. I would argue that this change is in fact useful as it allows you to control whether you want to look at the rust side of things or the ftl side of things via changing the query string only: with an increased number of translations checked into the repository, grepping for raw slugs will return the slug in many ftl files, so an explicit step to look for the source code is always useful. In the other direction (rust to fluent), you don't need a translation at all any more, as you can just take the final piece of the slug (e.g. `drop_trait_constraints`) and grep for that. The PR also adds enforcement to forbid usage of `_` in slug names. Internal slug names (those leading with a `-`) are exempt from that enforcement.
As another workflow that benefits from this change, people who add new errors don't have to do that `-` conversion either.
| Before/After | Fluent slug | Rust slug (no change) |
|--|--|--|
| Before | `lint-drop-trait-constraints` | `lint::drop_trait_constraints`|
| After | `lint_drop_trait_constraints` | `lint::drop_trait_constraints`|
Note that I've suggested this previously in the translation thread on zulip. I think it's important to think about non-translator contribution impact of fluent. I have certainly plans for more improvements, but this is a good first step.
``@rustbot`` label A-diagnostics
Rollup of 6 pull requests
Successful merges:
- #100211 (Refuse to codegen an upstream static.)
- #100277 (Simplify format_args builtin macro implementation.)
- #100483 (Point to generic or arg if it's the self type of unsatisfied projection predicate)
- #100506 (change `InlineAsmCtxt` to not talk about `FnCtxt`)
- #100534 (Make code slightly more uniform)
- #100566 (Use `create_snapshot_for_diagnostic` instead of `clone` for `Parser`)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
debuginfo: Generalize C++-like encoding for enums.
The updated encoding should be able to handle niche layouts where more than one variant has fields (as introduced in https://github.com/rust-lang/rust/pull/94075).
The new encoding is more uniform as there is no structural difference between direct-tag, niche-tag, and no-tag layouts anymore. The only difference between those cases is that the "dataful" variant in a niche-tag enum will have a `(start, end)` pair denoting the tag range instead of a single value.
The new encoding now also supports 128-bit tags, which occur in at least some standard library types. These tags are represented as `u64` pairs so that debuggers (which don't always have support for 128-bit integers) can reliably deal with them. The downside is that this adds quite a bit of complexity to the encoding and especially to the corresponding NatVis.
The new encoding seems to increase the size of (x86_64-pc-windows-msvc) debuginfo by 10-15%. The size of binaries is not affected (release builds were built with `-Cdebuginfo=2`, numbers are in kilobytes):
EXE | before | after | relative
-- | -- | -- | --
cargo (debug) | 40453 | 40450 | +0%
ripgrep (debug) | 10275 | 10273 | +0%
cargo (release) | 16186 | 16185 | +0%
ripgrep (release) | 4727 | 4726 | +0%
PDB | before | after | relative
-- | -- | -- | --
cargo (debug) | 236524 | 261412 | +11%
ripgrep (debug) | 53140 | 59060 | +11%
cargo (release) | 148516 | 169620 | +14%
ripgrep (release) | 10676 | 11804 | +11%
Given that the new encoding is more general, this is to be expected. Only platforms using C++-like debuginfo are affected -- which currently is only `*-pc-windows-msvc`.
*TODO*
- [x] Properly update documentation
- [x] Add regression tests for new optimized enum layouts as introduced by #94075.
r? `@wesleywiser`
Just moving code around so that triagebot can ping relevant parties when
translation logic is modified.
Signed-off-by: David Wood <david.wood@huawei.com>
change `InlineAsmCtxt` to not talk about `FnCtxt`
wip for https://github.com/rust-lang/compiler-team/issues/529. this currently uses both the `FnCtxt` and is used by `check_mod_item_types`. This should be the only thing blocking that MCP afaict.
I am still unsure whether `rustc_hir_typeck` should depend on `rustc_hir_analysis` to use the `InlineAsmCtxt`. I think that's the best solution for now, so that's what I will go for
r? `@compiler-errors`
Point to generic or arg if it's the self type of unsatisfied projection predicate
We do this for `TraitPredicate`s in `point_at_type_arg_instead_of_call_if_possible` and `point_at_arg_instead_of_call_if_possible`, so also do it for `ProjectionPredicate`.
Improves spans for a lot of unit tests.
Simplify format_args builtin macro implementation.
Instead of a FxHashMap<Symbol, (usize, Span)> for the named arguments, this now includes the name and span in the elements of the Vec<FormatArg> directly. The FxHashMap still exists to look up the index, but no longer contains the span. Looking up the name or span of an argument is now trivial and does not need the map anymore.
Visit attributes in more places.
This adds 3 loosely related changes (I can split PRs if desired):
- Attribute checking on pattern struct fields.
- Attribute checking on struct expression fields.
- Lint level visiting on pattern struct fields, struct expression fields, and generic parameters.
There are still some lints which ignore lint levels in various positions. This is a consequence of how the lints themselves are implemented. For example, lint levels on associated consts don't work with `unused_braces`.
`Parser::parse_bottom_expr` currently constructs an empty `attrs` and
then passes it to a large number of other functions. This makes the code
harder to read than it should be, because it's not clear that many
`attrs` arguments are always empty.
This commit removes `attrs` and the passing, simplifying a lot of
functions. The commit also renames `Parser::mk_expr` (which takes an
`attrs` argument) as `mk_expr_with_attrs`, and introduces a new
`mk_expr` which creates an expression with no attributes, which is the
more common case.
rustc_target: Update some old naming around self contained linking
The "fallback" naming pre-dates introduction of `-Clink-self-contained`.
Noticed when reviewing https://github.com/rust-lang/rust/pull/99500.
This PR doesn't break any json target spec, but supporting per-linker-flavor startup objects needed by https://github.com/rust-lang/rust/pull/99500 will break them, so maybe next time I'll remove the compatibility names.
orphan check: rationalize our handling of constants
cc `@rust-lang/types` `@rust-lang/project-const-generics` on whether you agree with this reasoning.
r? types
These use the same names as LLVM and is_riscv_feature_detected!:
- zba (address generation instructions)
- zbb (basic bit manipulation)
- zbc (carry-less multiplication)
- zbs (single-bit manipulation)
Argument type error improvements
Motivated by this interesting code snippet:
```rust
#[derive(Copy, Clone)]
struct Wrapper<T>(T);
fn foo(_: fn(i32), _: Wrapper<i32>) {}
fn f(_: u32) {}
fn main() {
let w = Wrapper::<isize>(1isize);
foo(f, w);
}
```
Which currently errors like:
```
error[E0308]: arguments to this function are incorrect
--> src/main.rs:10:5
|
10 | foo(f, w);
| ^^^ - - expected `i32`, found `isize`
| |
| expected `i32`, found `u32`
|
= note: expected fn pointer `fn(i32)`
found fn item `fn(u32) {f}`
= note: expected struct `Wrapper<i32>`
found struct `Wrapper<isize>`
note: function defined here
--> src/main.rs:4:4
|
4 | fn foo(_: fn(i32), _: Wrapper<i32>) {}
| ^^^ ---------- ---------------
```
Specifically, that double `expected .. found ..` which is very difficult to correlate to the types in the arguments. Also, the fact that "expected `i32`, found `isize`" and the other argument mismatch label don't even really explain what's going on here.
After this PR:
```
error[E0308]: arguments to this function are incorrect
--> $DIR/two-mismatch-notes.rs:10:5
|
LL | foo(f, w);
| ^^^
|
note: expected fn pointer, found fn item
--> $DIR/two-mismatch-notes.rs:10:9
|
LL | foo(f, w);
| ^
= note: expected fn pointer `fn(i32)`
found fn item `fn(u32) {f}`
note: expected struct `Wrapper`, found a different struct `Wrapper`
--> $DIR/two-mismatch-notes.rs:10:12
|
LL | foo(f, w);
| ^
= note: expected struct `Wrapper<i32>`
found struct `Wrapper<isize>`
note: function defined here
--> $DIR/two-mismatch-notes.rs:4:4
|
LL | fn foo(_: fn(i32), _: Wrapper<i32>) {}
| ^^^ ---------- ---------------
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.
```
Yeah, it's a bit verbose, but much clearer IMO.
---
Open to discussions about how this could be further improved. Motivated by `@jyn514's` [tweet](https://mobile.twitter.com/joshuayn514/status/1558042020601634816) here.
wf: correctly `shallow_resolve` consts
`shallow_resolve` on `InferConst` is always a noop. this is mostly irrelevant as inference vars should already be resolved at most - if not all - call sites. Haven't actually looked too deeply into whether this was a problem.
Erase regions better in `promote_candidate`
Use `tcx.erase_regions` instead of manually walking through the substs.... this also makes the code slightly simpler 🙈Fixes#100360Fixes#89851
For the most part, the macro actually worked with _ slugs, but the prefix_something -> prefix::something
conversion was not implemented.
We don't want to accept - slugs for consistency reasons.
We thus error if a name is found with - inside.
This ensures a consistent style.
Having to replace - with _ (and vice versa) makes the slugs less greppable
and thus constitutes a contributor roadblock.
Result of running this repeatedly up until reaching a fixpoint:
find compiler/rustc_error_messages/locales/en-US/ -type f -exec sed -i 's/\(.+\)-\(.*\)=/\1_\2=/' {} \;
Plus some fixes to update usages of slugs leading with -.
Rollup of 9 pull requests
Successful merges:
- #100022 (Optimize thread ID generation)
- #100030 (cleanup code w/ pointers in std a little)
- #100229 (add -Zextra-const-ub-checks to enable more UB checking in const-eval)
- #100247 (Generalize trait object generic param check to aliases.)
- #100255 (Adding more verbose documentation for `std::fmt::Write`)
- #100366 (errors: don't fail on broken primary translations)
- #100396 (Suggest const and static for global variable)
- #100409 (rustdoc: don't generate DOM element for operator)
- #100443 (Add two let else regression tests)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
errors: don't fail on broken primary translations
If a primary bundle doesn't contain a message then the fallback bundle is used. However, if the primary bundle's message is broken (e.g. it refers to a interpolated variable that the compiler isn't providing) then this would just result in a compiler panic. While there aren't any primary bundles right now, this is the type of issue that could come up once translation is further along.
r? ```@compiler-errors``` (since this comes out of a in-person discussion we had at RustConf)
Generalize trait object generic param check to aliases.
The current algorithm only checks that `Self` does not appear in defaults for traits. This is not sufficient for trait aliases.
This PR moves the check to trait object elaboration, which sees through trait aliases.
Fixes https://github.com/rust-lang/rust/issues/82927.
Fixes https://github.com/rust-lang/rust/issues/84789.
passes: load `defined_lib_features` query less
Hopefully addresses the perf regressions from #99212 (see #99905).
Re-structure the stability checks for library features to avoid calling `defined_lib_features` for any more crates than necessary for each of the implications or local feature attributes that need validation.
r? `@ghost` (just checking perf at first)
This was incorrectly inserting the ExprField as a sibling of the struct
expression.
This required adjusting various parts which were looking at parent node
of a field expression to find the struct.
This helps simplify the code. It also fixes it to use the correct parent
when lowering. One consequence is the `non_snake_case` lint needed
to change the way it looked for parent nodes in a struct pattern.
This also includes a small fix to use the correct `Target` for
expression field attribute validation.
This extends the LintLevelBuilder to handle lint level attributes on
struct expression fields and pattern fields.
This also updates the early lints to honor lint levels on generic
parameters.
Attributes on struct expression fields were not being checked for
validity. This adds the fields as HIR nodes so that `CheckAttrVisitor`
can visit those nodes to check their attributes.
Attributes on pattern struct fields were not being checked for validity.
This adds the fields as HIR nodes so that the `CheckAttrVisitor` can
visit those nodes to check their attributes.
Update to LLVM 15
For preliminary testing. Some LLVM 15 compatibility fixes were applied separately in #99512.
Release timeline:
* LLVM 15 branched on Jul 26.
* The final LLVM 15.0.0 release is scheduled for Sep 6.
* Current nightly (1.65.0) is scheduled for Nov 3.
Changes in this PR (apart from the LLVM update):
* Pass `--set llvm.allow-old-toolchain` for many Docker images. LLVM 16 will require GCC >= 7.1, while LLVM 15 still allows older compilers with an option. Specify the option for builders still using GCC 5.4. #95026 updated some of the used toolchains, but not all.
* Use the `+atomics-32` target feature for thumbv6m.
* Explicitly link libatomic when cross-compiling LLVM to 32-bit target.
* Explicitly disable zstd support, to avoid libzstd.so dependency.
New LLVM patches ([commits](https://github.com/rust-lang/llvm-project/commits/rustc/15.0-2022-08-09)):
* [rust-only] Fix ICE with GCC 5.4 (15be58d7f0)
* [rust-only] Fix build with GCC 5.4 (774edc10fa)
* ~~[rust-only] Fix build with GCC 5.2 (1a6069a7bb)~~
* ~~[rust-only] Fix ICE with GCC 5.2 (493081f290)~~
* ~~[rust-only] Fix build with GCC 5.2 (0fc5979d73)~~
* [backported] Addition of `+atomics` target feature (57bdd9892d).
* [backported] Revert compiler-rt change that broke powerpc (9c68b43915)
* [awaiting backport] Fix RelLookupTableConverter on gnux32 (639388a05f / https://github.com/llvm/llvm-project/issues/57021)
Tested images: dist-x86_64-linux, armhf-gnu, arm-android, dist-s390x-linux, dist-x86_64-illumos, dist-x86_64-freebsd, wasm32, dist-x86_64-musl, dist-various-1, dist-riscv64-linux, dist-mips-linux, dist-mipsel-linux, dist-powerpc-linux, dist-aarch64-linux, dist-x86_64-apple, x86_64-msvc-1, x86_64-msvc-2, dist-various-2, dist-arm-linux
Tested up to the usual ipv6 error: test-various, i686-gnu, x86_64-gnu-nopt
r? `@ghost`
Stringify non-shorthand visibility correctly
This makes `stringify!(pub(in crate))` evaluate to `pub(in crate)` rather than `pub(crate)`, matching the behavior before the `crate` shorthand was removed. Further, this changes `stringify!(pub(in super))` to evaluate to `pub(in super)` rather than the current `pub(super)`. If the latter is not desired (it is _technically_ breaking), it can be undone.
Fixes#99981
`@rustbot` label +C-bug +regression-from-stable-to-beta +T-compiler
Fix flags when using clang as linker for Fuchsia
Don't add C runtime or set dynamic linker when linking with clang for
Fuchsia. Clang already does this for us.
Use `&mut Diagnostic` instead of `&mut DiagnosticBuilder` unless needed
This seems to be the established convention (02ff9e0) when `DiagnosticBuilder` was first added. I am guilty of introducing some of these.
Remove duplicated temporaries creating during box derefs elaboration
Temporaries created with `MirPatch::new_temp` will be declared after
patch application. Remove manually created duplicate declarations.
Removing duplicates exposes another issue. Visitor elaborates
terminator twice and attempts to access new, but not yet available,
local declarations. Remove duplicated call to `visit_terminator`.
Extracted from #99946.
Determine match_has_guard from candidates instead of looking up thir table again
Currently looking through mir build of matches because of interest in deref patterns. Finding some micro-optimizable things.
Check if enum from foreign crate has any non exhaustive variants when attempting a cast
Fixes#91161
As stated in the issue, this will require a crater run as it might break other people's stuff.
Keep going if normalized projection has unevaluated consts in `QueryNormalizer`
#100312 was the wrong approach, I think this is the right one.
When normalizing a type, if we see that it's a projection, we currently defer to `tcx.normalize_projection_ty`, which normalizes the projections away but doesn't touch the unevaluated constants. So now we just continue to fold the type if it has unevaluated constants so we make sure to evaluate those too, if we can.
Fixes#100217Fixes#83972Fixes#84669Fixes#86710Fixes#82268Fixes#73298
Currently it's reported as either `TraitItem` or `ImplItem`. This commit
changes it to `AssocItem`, because having the report match the type name
is (a) consistent with other types, and (b) the trait/impl split isn't
that important here.
This commit:
- Adds a comment explaining which `visit_*` methods should be
implemented.
- Adds and removes some `visit_*` methods accordingly, improving
coverage, and avoiding some double counting.
Add support for link-flavor rust-lld for macOS
Also refactor iOS, watchOS and tvOS common code.
The ``-arch`` argument was moved to the ``apple_base`` module instead of the target definitions for macOS.
As ld64 requires ``-syslibroot`` to be passed, ``add_apple_sdk`` was modified accordingly.
If a primary bundle doesn't contain a message then the fallback bundle
is used. However, if the primary bundle's message is broken (e.g. it
refers to a interpolated variable that the compiler isn't providing)
then this would just result in a compiler panic. While there aren't any
primary bundles right now, this is the type of issue that could come up
once translation is further along.
Signed-off-by: David Wood <david.wood@huawei.com>
Rollup of 8 pull requests
Successful merges:
- #99573 (Stabilize backtrace)
- #100069 (Add error if link_ordinal used with unsupported link kind)
- #100086 (Add more `// unit-test`s to MIR opt tests)
- #100332 (Rename integer log* methods to ilog*)
- #100334 (Suggest a missing semicolon before an array)
- #100340 (Iterate generics_def_id_map in reverse order to fix P-critical issue)
- #100345 (docs: remove repetition in `is_numeric` function docs)
- #100352 (Update cargo)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Add error if link_ordinal used with unsupported link kind
The `link_ordinal` attribute only has an affect if the `raw-dylib` link kind is used, so add an error if it is used with any other link kind.
Stabilize backtrace
This PR stabilizes the std::backtrace module. As of #99431, the std::Error::backtrace item has been removed, and so the rest of the backtrace feature is set to be stabilized.
Previous discussion can be found in #72981, #3156.
Stabilized API summary:
```rust
pub mod std {
pub mod backtrace {
pub struct Backtrace { }
pub enum BacktraceStatus {
Unsupported,
Disabled,
Captured,
}
impl fmt::Debug for Backtrace {}
impl Backtrace {
pub fn capture() -> Backtrace;
pub fn force_capture() -> Backtrace;
pub const fn disabled() -> Backtrace;
pub fn status(&self) -> BacktraceStatus;
}
impl fmt::Display for Backtrace {}
}
}
```
`@yaahc`
