[borrowck] Fix help on mutating &self in async fns
Previously, when rustc was provided an async function that tried to
mutate through a shared reference to an implicit self (as shown in the
ui test), rustc would suggest modifying the parameter signature
to `&mut` + the fully qualified name of the ty (in the case of the repro
`S`). If a user modified their code to match the suggestion, the
compiler would not accept it.
This commit modifies the suggestion so that when rustc is provided the
ui test that is also attached in this commit, it suggests (correctly)
`&mut self`. We try to be careful about distinguishing between implicit
and explicit self annotations, since the latter seem to be handled
correctly already.
This is my first PR here so I'm pretty sure I probably missed something/could use better terminology. I also didn't try to make the match exhaustive since implicit self is the only real special case that I need to handle (that I'm aware of), and I'm pretty sure there's a cleaner way to do this so any advice would be greatly appreciated! (I'm also not terribly confident about how I wrote the ui tests)
here is your cc as requested `@compiler-errors`
This is an attempt to fix#93093
Make `Fingerprint::combine_commutative` associative
The previous implementation swapped lower and upper 64-bits of a result
of modular addition, so the function was non-associative.
r? `@Aaron1011`
Return an indexmap in `all_local_trait_impls` query
The data structure previously used here required that `DefId` be `Ord`. As part of #90317, we do not want `DefId` to implement `Ord`.
debuginfo: Make sure that type names for closure and generator environments are unique in debuginfo.
Before this change, closure/generator environments coming from different instantiations of the same generic function were all assigned the same name even though they were distinct types with potentially different data layout. Now we append the generic arguments of the originating function to the type name.
This commit also emits `{closure_env#0}` as the name of these types in order to disambiguate them from the accompanying closure function (which keeps being called `{closure#0}`). Previously both were assigned the same name.
NOTE: Changing debuginfo names like this can break pretty printers and other debugger plugins. I think it's OK in this particular case because the names we are changing were ambiguous anyway. In general though it would be great to have a process for doing changes like these.
Fix two incorrect "it's" (typos in comments)
Found one of these while reading the documentation online. The other came up because it's in the same file.
Add missing | between print options
The help text for the newly stabilized print option is missing a | between stack-protector-strategies and link-args.
Compiler panics should be rare - when they do occur, we want the report
filed by the user to contain as much information as possible. This is
especially important when the panic is due to an incremental compilation
bug, since we may not have enough information to reproduce it.
This PR sets `RUST_BACKTRACE=full` inside `rustc` if the user has not
explicitly set `RUST_BACKTRACE`. This is more verbose than
`RUST_BACKTRACE=1`, but this may make it easier to debug incremental
compilation issues. Users who find this too verbose can still manually
set `RUST_BACKTRACE` before invoking the compiler.
This only affects `rustc` (and any tool using `rustc_driver::install_ice_hook`).
It does *not* affect any user crates or the standard library -
backtraces will continue to be off by default in any application
*compiled* by rustc.
Make dead code check a query.
Dead code check is run for each invocation of the compiler, even if no modifications were involved.
This PR makes dead code check a query keyed on the module. This allows to skip the check when a module has not changed.
To perform this, a query `live_symbols_and_ignored_derived_traits` is introduced to encapsulate the global analysis of finding live symbols. The second query `check_mod_deathness` outputs diagnostics for each module based on this first query's results.
Currently, it can be `None` if the conversion from `OsString` fails, in
which case all searches will skip over the `SearchPathFile`.
The commit changes things so that the `SearchPathFile` just doesn't get
created in the first place. Same behaviour, but slightly simpler code.
Continue work on associated const equality
This actually implements some more complex logic for assigning associated consts to values.
Inside of projection candidates, it now defers to a separate function for either consts or
types. To reduce amount of code, projections are now generic over T, where T is either a Type or
a Const. I can add some comments back later, but this was the fastest way to implement it.
It also now finds the correct type of consts in type_of.
---
The current main TODO is finding the const of the def id for the LeafDef.
Right now it works if the function isn't called, but once you use the trait impl with the bound it fails inside projection.
I was hoping to get some help in getting the `&'tcx ty::Const<'tcx>`, in addition to a bunch of other `todo!()`s which I think may not be hit.
r? `@oli-obk`
Updates #92827
This code and comment appear to be out of date.
`CrateLocator::find_library_crate` is the only caller of this function
and it handles rlib vs dylib overlap itself (see
`CrateLocator::extract_lib`) after inspecting all the files present, so
it doesn't need to see them in any particular order.
Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`
Modern `gcc` versions support `-static-pie`, and `rustc` will already fall-back to `-static` if the local `gcc` is too old (and hence this change is optimistic rather than absolute). This brings the `-musl` and `-gnu` targets to feature compatibility (albeit with different default settings).
Of note a `-static` or `-static-pie` binary based on glibc that uses NSS-backed functions (`gethostbyname` or `getpwuid` etc.) need to have access to the `libnss_X.so.2` libraries and any of their dynamic dependencies.
I wasn't sure about the `# only`/`# ignore` changes (I've not got a `gnux32` toolchain to test with hence not also enabling `-static-pie` there).
Disable drop range analysis
The previous PR, #93165, still performed the drop range analysis despite ignoring the results. Unfortunately, there were ICEs in the analysis as well, so some packages failed to build (see the issue #93197 for an example). This change further disables the analysis and just provides dummy results in that case.
Before this change, closure/generator environments coming from different
instantiations of the same generic function were all assigned the same
name even though they were distinct types with potentially different data
layout. Now we append the generic arguments of the originating function
to the type name.
This commit also emits '{closure_env#0}' as the name of these types in
order to disambiguate them from the accompanying closure function
'{closure#0}'. Previously both were assigned the same name.
Rollup of 9 pull requests
Successful merges:
- #91343 (Fix suggestion to slice if scrutinee is a `Result` or `Option`)
- #93019 (If an integer is entered with an upper-case base prefix (0Xbeef, 0O755, 0B1010), suggest to make it lowercase)
- #93090 (`impl Display for io::ErrorKind`)
- #93456 (Remove an unnecessary transmute from opaque::Encoder)
- #93492 (Hide failed command unless in verbose mode)
- #93504 (kmc-solid: Increase the default stack size)
- #93513 (Allow any pretty printed line to have at least 60 chars)
- #93532 (Update books)
- #93533 (Update cargo)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Allow any pretty printed line to have at least 60 chars
Follow-up to #93155. The rustc AST pretty printer has a tendency to get stuck in "vertical smear mode" when formatting highly nested code, where it puts a linebreak at *every possible* linebreak opportunity once the indentation goes beyond the pretty printer's target line width:
```rust
...
((&([("test"
as
&str)]
as
[&str; 1])
as
&[&str; 1]),
(&([]
as
[ArgumentV1; 0])
as
&[ArgumentV1; 0]))
...
```
```rust
...
[(1
as
i32),
(2
as
i32),
(3
as
i32)]
as
[i32; 3]
...
```
This is less common after #93155 because that PR greatly reduced the total amount of indentation, but the "vertical smear mode" failure mode is still just as present when you have deeply nested modules, functions, or trait impls, such as in the case of macro-expanded code from `-Zunpretty=expanded`.
Vertical smear mode is never the best way to format highly indented code though. It does not prevent the target line width from being exceeded, and it produces output that is less readable than just a longer line.
This PR makes the pretty printing algorithm allow a minimum of 60 chars on every line independent of indentation. So as code gets more indented, the right margin eventually recedes to make room for formatting without vertical smear.
```console
├─────────────────────────────────────┤
├─────────────────────────────────────┤
├─────────────────────────────────────┤
├───────────────────────────────────┤
├─────────────────────────────────┤
├───────────────────────────────┤
├─────────────────────────────┤
├───────────────────────────┤
├───────────────────────────┤
├───────────────────────────┤
├───────────────────────────┤
├───────────────────────────┤
├─────────────────────────────┤
├───────────────────────────────┤
├─────────────────────────────────┤
├───────────────────────────────────┤
├─────────────────────────────────────┤
```
If an integer is entered with an upper-case base prefix (0Xbeef, 0O755, 0B1010), suggest to make it lowercase
The current error for this case isn't really great, it just complains about the whole thing past the `0` being an invalid suffix.
rustc_errors: only box the `diagnostic` field in `DiagnosticBuilder`.
I happened to need to do the first change (replacing `allow_suggestions` with equivalent functionality on `Diagnostic` itself) as part of a larger change, and noticed that there's only two fields left in `DiagnosticBuilderInner`.
So with this PR, instead of a single pointer, `DiagnosticBuilder` is two pointers, which should work just as well for passing *it* by value (and may even work better wrt some operations, though probably not by much).
But anything that was already taking advantage of `DiagnosticBuilder` being a single pointer, and wrapping it further (e.g. `Result<T, DiagnosticBuilder>` w/ non-ZST `T`), ~~will probably see a slowdown~~, so I want to do a perf run before even trying to propose this.
Check that `#[rustc_must_implement_one_of]` is applied to a trait
`#[rustc_must_implement_one_of]` only makes sense when applied to a trait, so it's sensible to emit an error otherwise.
Store def_id_to_hir_id as variant in hir_owner.
If hir_owner is Owner(_), the LocalDefId is pointing to an owner, so the ItemLocalId is 0.
If the HIR node does not exist, we store Phantom.
Otherwise, we store the HirId associated to the LocalDefId.
Related to #89278
r? `@oli-obk`
Switch pretty printer to block-based indentation
This PR backports 401d60c042 from the `prettyplease` crate into `rustc_ast_pretty`.
A before and after:
```diff
- let res =
- ((::alloc::fmt::format as
- for<'r> fn(Arguments<'r>) -> String {format})(((::core::fmt::Arguments::new_v1
- as
- fn(&[&'static str], &[ArgumentV1]) -> Arguments {Arguments::new_v1})((&([("test"
- as
- &str)]
- as
- [&str; 1])
- as
- &[&str; 1]),
- (&([]
- as
- [ArgumentV1; 0])
- as
- &[ArgumentV1; 0]))
- as
- Arguments))
- as String);
+ let res =
+ ((::alloc::fmt::format as
+ for<'r> fn(Arguments<'r>) -> String {format})(((::core::fmt::Arguments::new_v1
+ as
+ fn(&[&'static str], &[ArgumentV1]) -> Arguments {Arguments::new_v1})((&([("test"
+ as &str)] as [&str; 1]) as
+ &[&str; 1]),
+ (&([] as [ArgumentV1; 0]) as &[ArgumentV1; 0])) as
+ Arguments)) as String);
```
Previously the pretty printer would compute indentation always relative to whatever column a block begins at, like this:
```rust
fn demo(arg1: usize,
arg2: usize);
```
This is never the thing to do in the dominant contemporary Rust style. Rustfmt's default and the style used by the vast majority of Rust codebases is block indentation:
```rust
fn demo(
arg1: usize,
arg2: usize,
);
```
where every indentation level is a multiple of 4 spaces and each level is indented relative to the indentation of the previous line, not the position that the block starts in.
By itself this PR doesn't get perfect formatting in all cases, but it is the smallest possible step in clearly the right direction. More backports from `prettyplease` to tune the ibox/cbox indent levels around various AST node types are upcoming.
The `print_expr` method already places an `ibox(INDENT_UNIT)` around
every expr that gets printed. Some exprs were then using `self.head`
inside of that, which does its own `cbox(INDENT_UNIT)`, resulting in two
levels of indentation:
while true {
stuff;
}
This commit fixes those cases to produce the expected single level of
indentation within every expression containing a block.
while true {
stuff;
}
Previously the pretty printer would compute indentation always relative
to whatever column a block begins at, like this:
fn demo(arg1: usize,
arg2: usize);
This is never the thing to do in the dominant contemporary Rust style.
Rustfmt's default and the style used by the vast majority of Rust
codebases is block indentation:
fn demo(
arg1: usize,
arg2: usize,
);
where every indentation level is a multiple of 4 spaces and each level
is indented relative to the indentation of the previous line, not the
position that the block starts in.
Create `core::fmt::ArgumentV1` with generics instead of fn pointer
Split from (and prerequisite of) #90488, as this seems to have perf implication.
`@rustbot` label: +T-libs
Render more readable macro matcher tokens in rustdoc
Follow-up to #92334.
This PR lifts some of the token rendering logic from https://github.com/dtolnay/prettyplease into rustdoc so that even the matchers for which a source code snippet is not available (because they are macro-generated, or any other reason) follow some baseline good assumptions about where the tokens in the macro matcher are appropriate to space.
The below screenshots show an example of the difference using one of the gnarliest macros I could find. Some things to notice:
- In the **before**, notice how a couple places break in between `$(....)`↵`*`, which is just about the worst possible place that it could break.
- In the **before**, the lines that wrapped are weirdly indented by 1 space of indentation relative to column 0. In the **after**, we use the typical way of block indenting in Rust syntax which is put the open/close delimiters on their own line and indent their contents by 4 spaces relative to the previous line (so 8 spaces relative to column 0, because the matcher itself is indented by 4 relative to the `macro_rules` header).
- In the **after**, macro_rules metavariables like `$tokens:tt` are kept together, which is how just about everybody writing Rust today writes them.
## Before
![Screenshot from 2022-01-14 13-05-53](https://user-images.githubusercontent.com/1940490/149585105-1f182b78-751f-421f-a234-9dbc04fa3bbd.png)
## After
![Screenshot from 2022-01-14 13-06-04](https://user-images.githubusercontent.com/1940490/149585118-d4b52ea7-3e67-4b6e-a12b-31dfb8172f86.png)
r? `@camelid`
Rename _args -> args in format_args expansion
As observed in https://github.com/rust-lang/rust/pull/91359#discussion_r786058960, prior to that PR this variable was sometimes never used, such as in the case of:
```rust
println!("");
// used to expand to:
::std::io::_print(
::core::fmt::Arguments::new_v1(
&["\n"],
&match () {
_args => [],
},
),
);
```
so the leading underscore in `_args` was used to suppress an unused variable lint. However after #91359 the variable is always used when present, as the unused case would instead expand to:
```rust
::std::io::_print(::core::fmt::Arguments::new_v1(&["\n"], &[]));
```
Add note suggesting that predicate may be satisfied, but is not `const`
Not sure if we should be printing this in addition to, or perhaps _instead_ of the help message:
```
help: the trait `~const Add` is not implemented for `NonConstAdd`
```
Also added `ParamEnv::is_const` and `PolyTraitPredicate::is_const_if_const` and, in a separate commit, used those in other places instead of `== hir::Constness::Const`, etc.
r? ````@fee1-dead````
remove unused `jemallocator` crate
When it was noticed that the rustc binary wasn't actually using jemalloc via `#[global_allocator]` and that was removed, the dependency remained.
Tests pass locally with a `jemalloc = true` build, but I'll trigger a try build to ensure I haven't missed an edge-case somewhere.
r? ```@ghost``` until that completes
Add `intrinsics::const_deallocate`
Tracking issue: #79597
Related: #91884
This allows deallocation of a memory allocated by `intrinsics::const_allocate`. At the moment, this can be only used to reduce memory usage, but in the future this may be useful to detect memory leaks (If an allocated memory remains after evaluation, raise an error...?).
Rollup of 10 pull requests
Successful merges:
- #92611 (Add links to the reference and rust by example for asm! docs and lints)
- #93158 (wasi: implement `sock_accept` and enable networking)
- #93239 (Add os::unix::net::SocketAddr::from_path)
- #93261 (Some unwinding related cg_ssa cleanups)
- #93295 (Avoid double panics when using `TempDir` in tests)
- #93353 (Unimpl {Add,Sub,Mul,Div,Rem,BitXor,BitOr,BitAnd}<$t> for Saturating<$t>)
- #93356 (Edit docs introduction for `std::cmp::PartialOrd`)
- #93375 (fix typo `documenation`)
- #93399 (rustbuild: Fix compiletest warning when building outside of root.)
- #93404 (Fix a typo from #92899)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup