Stabilize cfg_target_vendor
This stabilizes the use of `cfg(target_vendor = "...")` and removes the corresponding `cfg_target_vendor` feature. Other unstable cfgs remain behind their existing feature gates.
This functionality was added back in 2015 in #28612 to complete the coverage of target tuples (`<arch><sub>-<vendor>-<os>-<env>`). [RFC 131](https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md) governs the target specification, not including `target_vendor` seems to have just been an oversight. `target_os`, `target_family`, and `target_arch` are stable as of 1.0.0. `target_env` was also not mentioned in RFC 131, was added in #24777, never behind a feature_gate, and insta-stable at 1.1.0.
The functionality is tested in [test/run-pass/cfg/cfg-target-vendor.rs](https://github.com/rust-lang/rust/blob/master/src/test/run-pass/cfg/cfg-target-vendor.rs).
Closes#29718
MetadataOnlyCodegenBackend: run the collector only once
Use the `collect_and_partition_mono_items` query to avoid calling the collector directly twice.
Fixes#57406.
Use structured suggestions for nonstandard style lints
This PR modifies the lints in the nonstandard_style group to use structured suggestions. Note that there's a bit of tricky span calculation going on for the `crate_name` attribute. It also simplifies the code a bit: I don't think the "fallback" suggestions for these lints can actually be triggered.
Fixes#48103.
Fixes#52414.
Tweak output of type mismatch between "then" and `else` `if` arms
```
error[E0308]: if and else have incompatible types
--> $DIR/if-else-type-mismatch.rs:5:9
|
LL | let _ = if true {
| _____________-
LL | | 42i32
| | ----- expected because of this
LL | | } else {
LL | | 42u32
| | ^^^^^ expected i32, found u32
LL | | };
| |_____- if and else have incompatible types
|
= note: expected type `i32`
found type `u32`
error[E0308]: if and else have incompatible types
--> file.rs:2:38
|
LL | let _ = if false { 3u8; } else { 3u8 };
| ---- ^^^ expected (), found u8
| | |
| | help: consider removing this semicolon
| expected because of this
|
= note: expected type `()`
found type `u8`
error[E0308]: if and else have incompatible types
--> file.rs:3:37
|
LL | let _ = if false { 3u8 } else { 3u8; };
| --- ^^^-
| | | |
| | | help: consider removing this semicolon
| | expected u8, found ()
| expected because of this
|
= note: expected type `u8`
found type `()`
error[E0308]: if and else have incompatible types
--> file.rs:4:37
|
LL | let _ = if false { 3i8 } else { 3u8 };
| --- ^^^ expected i8, found u8
| |
| expected because of this
|
= note: expected type `i8`
found type `u8`
```
Fix#57348.
Add dist builder for Armv8-M Mainline
This commit adds the Armv8-M Mainline target in the list of targets that
get their dist components built. It also update the build-manifest so
that this target gets also its dist components uploaded.
I took example on other pull requests doing the same thing for another target to make the changes. Please feel free to comment if things needs to be added or removed.
Doing `./x.py dist --target thumbv8m.main-none-eabi` worked locally so I assume that this will also work on the CI.
It will (I think) however need a new release of alexcrichton/cc-rs to include the pull request alexcrichton/cc-rs#363 @alexcrichton
I hope to do the HardFloat version (`thumbv8m.main-none-eabihf`) and Baseline (`thumbv8m.base-none-eabi`) later, as fixes need to be done on compiler-builtins first to support those.
Rollup of 4 pull requests
Successful merges:
- #56874 (Simplify foreign type rendering.)
- #57113 (Move diagnostics out from QueryJob and optimize for the case with no diagnostics)
- #57366 (Point at match discriminant on type error in match arm pattern)
- #57538 (librustc_mir: Fix ICE with slice patterns)
Failed merges:
- #57381 (Tweak output of type mismatch between "then" and `else` `if` arms)
r? @ghost
librustc_mir: Fix ICE with slice patterns
If a match arm does not include all fields in a structure and a later
pattern includes a field that is an array, we will attempt to use the
array type from the prior arm. When calculating the field type, treat
a array of an unknown size as a `TyErr`.
Fixes: #57472
Point at match discriminant on type error in match arm pattern
```
error[E0308]: mismatched types
--> src/main.rs:5:9
|
4 | let temp: usize = match a + b {
| ----- this expression has type `usize`
5 | Ok(num) => num,
| ^^^^^^^ expected usize, found enum `std::result::Result`
|
= note: expected type `usize`
found type `std::result::Result<_, _>`
```
Fix#57279.
Simplify foreign type rendering.
Simplified foreign type rendering by switching from tables to flexbox. Also, removed some seemingly extraneous elements like “ghost” spans.
Reduces element count on the `std::iter::Iterator` page by 30%. On my laptop it drops Iterator page load time from ~15s to ~10s. Frame times during scrolling are a hair lower too.
Known visual changes (happy to tweak based on feedback):
* The main `impl ...` headers are now getting the default, larger, h3 font size. This was an accident, but I liked how it turned out so I didn't fix it.
* There's a hair less vertical spacing between the end of a where block and the start of the next fn. Now, all spacing is consistent. I think this looks a bit worse. I may tweak vertical spacing more here or in a follow-up that cleans up vertical spacing more broadly.
* "[src]" links are all sized at 17px. A few were 19px in the original.
I haven't yet done heavy cross-browser or cross-crate testing. I was hoping to get a quick thumbs up or thumbs down here at this first draft, then if this is on the right track I'll spend some time on that testing.
TODO:
- [x] Test on Chrome
- [x] Test on Firefox
- [ ] ~~Test on UC Android~~
- [x] Test on Edge
- [x] Test on iOS safari
- [x] Test on desktop safari
- [x] Update automated tests
- [x] Increase vertical margin
- [x] Fix "Important traits for" hover overlap
- [x] Wait for #55798 to land & merge it
rustc: Place wasm linker args first instead of last
This ensures that arguments passed via `-C link-arg` can override the
first ones on the command line, for example allowing configuring of the
stack size.
NLL: Add union justifications to conflicting borrows.
Fixes#57100.
This PR adds justifications to error messages for conflicting borrows of union fields.
Where previously an error message would say ``cannot borrow `u.b` as mutable..``, it now says ``cannot borrow `u` (via `u.b`) as mutable..``.
r? @pnkfelix
Make `TokenStream` less recursive.
`TokenStream` is currently recursive in *two* ways:
- the `TokenTree` variant contains a `ThinTokenStream`, which can
contain a `TokenStream`;
- the `TokenStream` variant contains a `Vec<TokenStream>`.
The latter is not necessary and causes significant complexity. This
commit replaces it with the simpler `Vec<(TokenTree, IsJoint)>`.
This reduces complexity significantly. In particular, `StreamCursor` is
eliminated, and `Cursor` becomes much simpler, consisting now of just a
`TokenStream` and an index.
The commit also removes the `Extend` impl for `TokenStream`, because it
is only used in tests. (The commit also removes those tests.)
Overall, the commit reduces the number of lines of code by almost 200.
If a match arm does not include all fields in a structure and a later
pattern includes a field that is an array, we will attempt to use the
array type from the prior arm. When calculating the field type, treat
a array of an unknown size as a TyErr.
Rollup of 16 pull requests
Successful merges:
- #57351 (Don't actually create a full MIR stack frame when not needed)
- #57353 (Optimise floating point `is_finite` (2x) and `is_infinite` (1.6x).)
- #57412 (Improve the wording)
- #57436 (save-analysis: use a fallback when access levels couldn't be computed)
- #57453 (lldb_batchmode.py: try `import _thread` for Python 3)
- #57454 (Some cleanups for core::fmt)
- #57461 (Change `String` to `&'static str` in `ParseResult::Failure`.)
- #57473 (std: Render large exit codes as hex on Windows)
- #57474 (save-analysis: Get path def from parent in case there's no def for the path itself.)
- #57494 (Speed up item_bodies for large match statements involving regions)
- #57496 (re-do docs for core::cmp)
- #57508 (rustdoc: Allow inlining of reexported crates and crate items)
- #57547 (Use `ptr::eq` where applicable)
- #57557 (resolve: Mark extern crate items as used in more cases)
- #57560 (hygiene: Do not treat `Self` ctor as a local variable)
- #57564 (Update the const fn tracking issue to the new metabug)
Failed merges:
r? @ghost
Update the const fn tracking issue to the new metabug
The new `const fn` tracking issue is #57563. We don't want to point to a closed issue in the diagnostics (or FIXMEs), so these have been updated (from the old issue, #24111).
r? @Centril
Use `ptr::eq` where applicable
Stumbled upon a few of `A as *const _ as usize == B as *const as usize`, so I decided to follow the programming boy scout rule (😄) and replaced the pattern with more widely used `ptr::eq`.
rustdoc: Allow inlining of reexported crates and crate items
Fixes#46296
This PR checks for when a `pub extern crate` statement has a `#[doc(inline)]` attribute & inlines its contents. Code is based off of the inlining statements for `pub use` statements.
Speed up item_bodies for large match statements involving regions
These changes don't change anything about the complexity of the algorithms, but use some easy shortcuts or modifications to cut down some overhead.
The first change, which incrementally removes the constraints from the set we're iterating over probably introduces some overhead for small to medium sized constraint sets, but it's not big enough for me to observe it in any project I tested against (not that many though).
Though most other crates probably won't improve much at all, because huge matches aren't that common, the changes seemed simple enough for me to make them.
Ref #55528
cc unicode-rs/unicode-normalization#29
r? @nikomatsakis
save-analysis: Get path def from parent in case there's no def for the path itself.
This fixes#57462.
The relevant part from the hir type collector is:
```
DEBUG 2019-01-09T15:42:58Z: rustc::hir::map::collector: hir_map: NodeId(32) => Entry { parent: NodeId(33), dep_node: 4294967040, node: Expr(expr(32: <Foo>::new)) }
DEBUG 2019-01-09T15:42:58Z: rustc::hir::map::collector: hir_map: NodeId(48) => Entry { parent: NodeId(32), dep_node: 4294967040, node: Ty(type(Foo)) }
DEBUG 2019-01-09T15:42:58Z: rustc::hir::map::collector: hir_map: NodeId(30) => Entry { parent: NodeId(48), dep_node: 4294967040, node: PathSegment(PathSegment { ident: Foo#0, id: Some(NodeId(30)), def: Some(Err), args: None, infer_types: true }) }
DEBUG 2019-01-09T15:42:58Z: rustc::hir::map::collector: hir_map: NodeId(31) => Entry { parent: NodeId(32), dep_node: 4294967040, node: PathSegment(PathSegment { ident: new#0, id: Some(NodeId(31)), def: Some(Err), args: None, infer_types: true }) }
```
We have the right ID when looking for NodeId(31) and try with NodeId(32) (which
is the right thing to look for) from get_path_data. But not when we look from `write_sub_paths_truncated`
Basically process_path takes an id which is always the parent, and that we
fall back to in get_path_data(), so we get the right result for the last path
segment, but not for the other segments that get written to from
write_sub_paths_truncated.
I think we can stop passing the explicit `id` around to get_path_data as a followup.
std: Render large exit codes as hex on Windows
On Windows process exit codes are never signals but rather always 32-bit
integers. Most faults like segfaults and such end up having large
integers used to represent them, like STATUS_ACCESS_VIOLATION being
0xC0000005. Currently, however, when an `ExitStatus` is printed this
ends up getting rendered as 3221225477 which is somewhat more difficult
to debug.
This commit adds a branch in `Display for ExitStatus` on Windows which
handles exit statuses where the high bit is set and prints those exit
statuses as hex instead of with decimals. This will hopefully preserve
the current display for small exit statuses (like `exit code: 22`), but
assist in quickly debugging segfaults/access violations/etc. I've
found at least that the hex codes are easier to search for than decimal.
I wasn't able to find any official documentation saying that all system
exit codes have the high bit set, but I figure it's a good enough
heuristic for now.
Change `String` to `&'static str` in `ParseResult::Failure`.
This avoids 770,000 allocations when compiling the `html5ever`
benchmark, reducing instruction counts by up to 2%.
save-analysis: use a fallback when access levels couldn't be computed
Fixing an RLS regression I introduced in https://github.com/rust-lang/rust/pull/57343😢
I missed a case where we get [called back with analysis when type checking fails](9d54812829/src/librustc_driver/driver.rs (L1264)). Since privacy checking normally is done afterwards, when we execute the `privacy_access_levels` query inside the save_analysis callback we'll calculate it for the first time and since typeck info isn't complete, we'll crash there.
Double-checked locally and it seems to have fixed the problem.
r? @nikomatsakis
Don't actually create a full MIR stack frame when not needed
r? @dotdash
This should significantly reduce overhead during const propagation and reduce overhead *after* copy propagation (cc https://github.com/rust-lang/rust/issues/36673)
