Uplift `clippy::fn_null_check` lint
This PR aims at uplifting the `clippy::fn_null_check` lint into rustc.
## `incorrect_fn_null_checks`
(warn-by-default)
The `incorrect_fn_null_checks` lint checks for expression that checks if a function pointer is null.
### Example
```rust
let fn_ptr: fn() = /* somehow obtained nullable function pointer */
if (fn_ptr as *const ()).is_null() { /* ... */ }
```
### Explanation
Function pointers are assumed to be non-null, checking for their nullity is incorrect.
-----
Mostly followed the instructions for uplifting a clippy lint described here: https://github.com/rust-lang/rust/pull/99696#pullrequestreview-1134072751
`@rustbot` label: +I-lang-nominated
r? compiler
Rewrite `UnDerefer`, again
This PR is intended to improve the perf regression introduced by #112882.
`UnDerefer` has been separated out again for borrowck reasons. It was a bit overzealous to remove it in the previous PR.
r? `@oli-obk`
- moved work from `find_local` to `gather_statement`
- created custom iterator for `iter_projections`
- reverted change from `IndexVec` to `FxIndexMap`
Don't use serde-derive in the rls shim
The already-small RLS shim can get a little smaller, and faster to
build, if we drop the serde-derive dependency and decode the one
"method" field it needs manually from `serde_json::Value`.
Remove `rustc_llvm` from llvm-stamp nags
LLVM is not *built* by `compiler/rustc_llvm` at all, only bindings on
top of it, so there's no need to bump `download-ci-llvm-stamp` for that.
Dynamically size sigaltstk in rustc
rustc installs a signal stack that assumes that MINSIGSTKSZ is a constant, unchanging value. Newer hardware undermines that assumption greatly, with register files larger than glibc's traditional static MINSIGSTKZ. Properly handle this so that it is correct on all supported Linux versions with all CPUs.
style-guide: Expand example of combinable expressions to include arrays
Arrays are allowed as combinable expressions, but none of the examples
show that.
CI: use `macos-13` runner for Apple jobs
Trying if performance of Apple CI improves with macOS 13 and SIP disabled. Speed-up:
```
x86_64-apple-1: ~2h 20m > ~1h 20m
x86_64-apple-2: ~1h 45m > ~1h 15m
```
r? `@pietroalbini`
The already-small RLS shim can get a little smaller, and faster to
build, if we drop the serde-derive dependency and decode the one
"method" field it needs manually from `serde_json::Value`.
rustc installs a signal stack that assumes that
MINSIGSTKSZ is a constant, unchanging value.
Newer hardware undermines that assumption greatly,
with register files larger than MINSIGSTKZ.
Properly handle this so that it is correct on
all supported Linux versions with all CPUs.
Replace RPITIT current impl with new strategy that lowers as a GAT
This PR replaces the current implementation of RPITITs with the new implementation that we had under -Zlower-impl-trait-in-trait-to-assoc-ty flag that lowers the RPIT as a GAT on the trait and on the impls that implement that trait.
Opening this PR as a draft because this goes after #112682, ~#112981~ and ~#112983~.
As soon as those are merged, I can rebase and we should run perf, crater and test a lot.
r? `@compiler-errors`
Add `Read`, `Write` and `Seek` impls for `Arc<File>` where appropriate
If `&T` implements these traits, `Arc<T>` has no reason not to do so
either. This is useful for operating system handles like `File` or
`TcpStream` which don't need a mutable reference to implement these
traits.
CC #53835.
CC #94744.
Rollup of 2 pull requests
Successful merges:
- #113331 (Add filter with following segment while lookup typo for path)
- #113524 (Remove the library/term exception in tidy's pal checker code)
r? `@ghost`
`@rustbot` modify labels: rollup
Add filter with following segment while lookup typo for path
From the discussion: https://github.com/rust-lang/rust/pull/112917#discussion_r1239150173
Seems we can not get the assoc items for `Struct`, `Enum` in the resolving phase.
A obvious filter is avoid suggesting the same name with the following segment path.
Use `following_seg` can extend the function `smart_resolve_partial_mod_path_errors` for more scenarios, such as `std::sync_error::atomic::AtomicBool` in test case.
r? `@estebank`
move pal cfgs in f32 and f64 to sys
I'd like to push forward on `sys` being a separate crate. To start with, most of these PAL exception cases are very simple little bits of code like this, so I thought I would try tidying them up.
Re-enable some coverage tests on Linux
These tests were originally disabled (on all platforms) in #110393, because those changes had made them start failing on Linux for unclear reasons.
I tried to re-enable them unconditionally in #111179, since they worked locally on my Mac, but I found that they were still failing on Linux, so I gave up at that time.
Later while working on #112300 I was able to re-enable them on Windows and Mac, since those changes made it possible to add specific `ignore-` directives to individual tests. I noticed at the time that the tests actually seemed to be working again on Linux, but by that point I didn't want to risk more CI failures, so I left them disabled on Linux with an intention to re-enable them later.
Now I'm going back to re-enable them on Linux too, since they seem to work fine.
---
Because `run-coverage` tests are sensitive to line numbers, and `x test tidy` doesn't like leading blank lines, I've replaced the old comment/ignore with an informative comment that occupies the same number of lines.
Copy stage0 `rustc` binaries to `stage0-sysroot`
This is basically a revival of https://github.com/rust-lang/rust/pull/101711 and https://github.com/rust-lang/rust/pull/107956, with an added check that the full sysroot will only be created if the original rustc comes from `stage0/bin`.
What is/should be tested:
- [x] `rustup toolchain link stage0` (new libstd is used correctly)
- [x] `python3 x.py fmt dist --stage 0`
- [x] Custom rustc/cargo in `config.toml` (in this case this logic is ignored)
- [x] Perfbot (try perf run has succeeded)
- [x] Real use case (https://github.com/rust-lang/backtrace-rs/pull/542)
(Hopefully) fixes: https://github.com/rust-lang/rust/issues/101691
This is not the "end all, be all" solution to this problem, but as long as it resolves the basic use-case, and doesn't break perfbot, I say ship it. This code will probably be nuked anyway Soon™ because of the stage redesign.
Add Tests for native wasm exceptions
### Motivation
In PR #111322, I added support for native WASM exceptions. I was asked by ``@davidtwco`` to add some tests for it in a follow up PR, which seems like a very good idea.
This PR adds three tests for this feature:
* codegen: ensure the correct LLVM instructions are used
* assembly: ensure the correct WASM instructions are used
* run-make: ensure the exception handling works; the WASM code is run using a small nodejs script which demonstrates the exception handling
### Complications
There are a few changes beside adding the tests, which were necessary
* Tests for the wasm32-unknown-unknown target are (as far as I know) only run on `test-various`. Its docker image uses nodejs-15, which is very old. Experimental support for wasm-exceptions was added in nodejs16. In nodejs 18.12 (LTS), they are stable.
- --> increase nodejs to 18.12 in `test-various`
* codegen/assembly tests are not performed for the wasm32-unknown-unknown target yet
- --> add those to `test-various` as well
Due to the last point, some tests are run which have not run before (assembly+codegen tests for wasm32-unknown-unknown). I added `// ignore wasm32-bare` for those which failed
### Local testing
I run all tests locally using both `test-various` and `wasm32`. As far as I know, none of the other systems run any test for wasm32 targets.
Always name the return place.
MIR opts more and more consider `_0` as just another local, so there is no point in keeping the special case in debug-info logic.
Update debuginfo test runner to provide more useful output
This change makes debuginfo tests more user friendly. Changes:
- Print all lines that fail to match the patterns instead of just the first
- Provide better error messages that also say what did match
- Strip leading whitespace from directives so they are not skipped if indented
- Improve documentation and improve nesting on some related items
As an example, given the following intentional fail (and a few not shown):
```rust
// from tests/debuginfo/rc_arc.rs
// cdb-command:dx rc,d
// cdb-check:rc,d : 111 [Type: alloc::rc::Rc<i32>]
// cdb-check: [Reference count] : 11 [Type: core::cell FAIL::Cell<usize>]
// cdb-check: [Weak reference count] : 2 [Type: core::cell FAIL::Cell<usize>]
```
The current output (tested in #113313) will show:
```
2023-07-04T08:10:00.1939267Z ---- [debuginfo-cdb] tests\debuginfo\rc_arc.rs stdout ----
2023-07-04T08:10:00.1942182Z
2023-07-04T08:10:00.1957463Z error: line not found in debugger output: [Reference count] : 11 [Type: core:: cell FAIL::Cell<usize>]
2023-07-04T08:10:00.1958272Z status: exit code: 0
```
With this chane, you are able to see all failures in that check group, as well as what parts were successful. The output is now:
```
2023-07-04T09:45:57.2514224Z error: check directive(s) from `C:\a\rust\rust\tests\debuginfo\rc_arc.rs` not found in debugger output. errors:
2023-07-04T09:45:57.2514631Z (rc_arc.rs:31) ` [Reference count] : 11 [Type: core::cell FAIL::Cell<usize>]`
2023-07-04T09:45:57.2514908Z (rc_arc.rs:32) ` [Weak reference count] : 2 [Type: core::cell FAIL::Cell<usize>]`
2023-07-04T09:45:57.2515181Z (rc_arc.rs:41) ` [Reference count] : 21 [Type: core::sync::atomic FAIL::AtomicUsize]`
2023-07-04T09:45:57.2515452Z (rc_arc.rs:50) `dyn_rc,d [Type: alloc::rc::Rc<dyn$<core::fmt FAIL::Debug> >]`
2023-07-04T09:45:57.2515695Z the following subset of check directive(s) was found successfully::
2023-07-04T09:45:57.2516080Z (rc_arc.rs:30) `rc,d : 111 [Type: alloc::rc::Rc<i32>]`
2023-07-04T09:45:57.2516312Z (rc_arc.rs:35) `weak_rc,d : 111 [Type: alloc::rc::Weak<i32>]`
2023-07-04T09:45:57.2516555Z (rc_arc.rs:36) ` [Reference count] : 11 [Type: core::cell::Cell<usize>]`
2023-07-04T09:45:57.2516881Z (rc_arc.rs:37) ` [Weak reference count] : 2 [Type: core::cell::Cell<usize>]`
...
```
Which makes it easier to see what did and didn't succeed without manual comparison against the source test file.
Port PGO/LTO/BOLT optimized build pipeline to Rust
This PR ports the `stage-build.py` PGO/LTO/BOLT optimization script from Python to Rust, to make it easier to use dependencies, and make it a bit more robust. The PR switches both the Linux and Windows dist runners to the Rust script and removes the old Python script.
Funnily enough, the Rust port has less lines of code than the Python script :) I think that clearly shows that the Python script really lacked dependencies.
