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Rollup of 11 pull requests #69056

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Rollup of 11 pull requests #69056

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r? @ghost

matthewjasper and others added 30 commits February 2, 2020 21:46
Union fields have the ParamEnv of the union.
* Handle cycles in `needs_drop` correctly
* Normalize types when computing `needs_drop`
* Move queries from rustc to rustc_ty
* Handle arrays with const-generic lengths
* Use closure for repeated code.
Currently, every iteration of the main loop in `generic_extension`
instantiates a `Parser`, which is expensive because `Parser` is a large
type. Many of those instantiations are only used immutably, particularly
for simple-but-repetitive macros of the sort seen in `html5ever` and PR
68836.

This commit initializes a single "base" parser outside the loop, and
then uses `Cow` to avoid cloning it except for the mutating iterations.
This speeds up `html5ever` runs by up to 15%.
The previous commit wrapped `Parser` within a `Cow` for the hot macro
parsing path. As a result, there's no need for the `Cow` within
`Directory`, because it lies within `Parser`.
This is a small win, because `Failure` is much more common than
`Success`.
Co-Authored-By: varkor <github@varkor.com>
petrochenkov and others added 18 commits February 10, 2020 20:29
Improve `ty.needs_drop`

* Handle cycles in `needs_drop` correctly
* Normalize types when computing `needs_drop`
* Move queries from rustc to rustc_ty
* Avoid query in simple cases

reopens #65918
Python script PEP8 style guide space formatting and minor Python source cleanup

This PR includes the following changes in the Python sources based on a flake8 3.7.9 (mccabe: 0.6.1, pycodestyle: 2.5.0, pyflakes: 2.1.1) CPython 3.7.6 on Darwin lint:

- PEP8 style guide spacing updates *without* line length changes
- removal of unused local variable assignments in context managers and exception handling
- removal of unused Python import statements
- removal of unnecessary semicolons
…iser

miri: improve and simplify overflow detection

This simplifies the overflow detection for signed binary operators, and adds overflow detection to unary operators so that const-prop doesn't have to crudely hand-roll that.

It also fixes some bugs in the operator implementation that however, I think, were not observable.

r? @oli-obk @wesleywiser
traits: preallocate 2 Vecs of known initial size

The 2 preallocations are pretty obvious; both vectors will be as big as or larger than the collections they are created from.

In `WfPredicates::normalize` the change from a functional style improves readability and should be perf-friendly, too.
Remove common usage pattern from `AllocRef`

This removes the common usage patterns from `AllocRef`:
- `alloc_one`
- `dealloc_one`
- `alloc_array`
- `realloc_array`
- `dealloc_array`

Actually, they add nothing to `AllocRef` except a [convenience wrapper around `Layout` and other methods in this trait](https://doc.rust-lang.org/1.41.0/src/core/alloc.rs.html#1076-1240) but have a major flaw: The documentation of `AllocRefs` notes, that

> some higher-level allocation methods (`alloc_one`, `alloc_array`) are well-defined on zero-sized types and can optionally support them: it is left up to the implementor whether to return `Err`, or to return `Ok` with some pointer.

With the current API, `GlobalAlloc` does not have those methods, so they cannot be overridden for `liballoc::Global`, which means that even if the global allocator would support zero-sized allocations, `alloc_one`, `alloc_array`, and `realloc_array` for `liballoc::Global` will error, while calling `alloc` with a zeroed-size `Layout` could succeed. Even worse: allocating with `alloc` and deallocating with `dealloc_{one,array}` could end up with not calling `dealloc` at all!

For the full discussion please see rust-lang/wg-allocators#18

r? @Amanieu
Add missing `_zeroed` varants to `AllocRef`

The majority of the allocator wg has decided to add the missing `_zeroed` variants to `AllocRef`:

> these should be added since they can be efficiently implemented with the `mremap` system call on Linux. `mremap` allows you to move/grow/shrink a memory mapping, and any new pages added for growth are guaranteed to be zeroed.
>
> If `AllocRef` does not have these methods then the user will have to manually write zeroes to the added memory since the API makes no guarantees on their contents.

For the full discussion please see rust-lang/wg-allocators#14.

This PR provides default implementations for `realloc_zeroed`, `alloc_excess_zeroed`, `realloc_excess_zeroed`, and `grow_in_place_zeroed`.

r? @Amanieu
Use `dyn Trait` more in tests

Here are some tests using the old trait object type syntax which are not testing the syntax itself.

This has been extracted from #66364.
…trochenkov

ICE in nightly-2020-02-08: handle TerminatorKind::Yield in librustc_mir::transform::promote_consts::Validator method

IR: #69017
regressed commit: f8fd462
Source: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2018&gist=55e65a869e1f5fef64cc4462b1a5a087

Addresses ICE reported in #69017 by handling `TerminatorKind::Yield` in https://github.com/rust-lang/rust/blob/4d1241f5158ffd66730e094d8f199ed654ed52ae/src/librustc_mir/transform/promote_consts.rs#L465-L468.

<details><summary>Nightly build</summary>
<p>

```
$ cargo +nightly build
Compiling yielder v0.1.0 (/Users/chris/Desktop/tests/rustlang-tests/yielder)
error: internal compiler error: src/librustc_mir/transform/promote_consts.rs:467: _1 = suspend(move _21) -> [resume: bb2, drop: bb3] not promotable
 --> src/main.rs:8:27
  |
8 |         println!("-> {}", yield);
  |                           ^^^^^

thread 'rustc' panicked at 'Box<Any>', <::std::macros::panic macros>:2:4
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.43.0-nightly (71c7e14 2020-02-09) running on x86_64-apple-darwin

note: compiler flags: -C debuginfo=2 -C incremental --crate-type bin

note: some of the compiler flags provided by cargo are hidden

error: aborting due to previous error

error: could not compile `yielder`.

To learn more, run the command again with --verbose.
```

</p>
</details>

<details><summary>Stage 1 dev build</summary>
<p>

```
$ cargo +stage1 build
Compiling yielder v0.1.0 (/Users/chris/Desktop/tests/rustlang-tests/yielder)
warning: function is never used: `gen`
 --> src/main.rs:6:4
  |
6 | fn gen() -> impl Generator<usize> {
  |    ^^^
  |
  = note: `#[warn(dead_code)]` on by default

    Finished dev [unoptimized + debuginfo] target(s) in 0.53s
```

</p>
</details>

@jonas-schievink @oli-obk
parser: Remove `Parser::prev_token_kind`

Follow-up to #69006.
r? @Centril
Don't rustfmt check the vendor directory.

I need to be able to run `x.py tidy` to do license checks (which requires vendored dependencies).  However, when vendoring is enabled, it wants to rustfmt check the entire vendor directory, which doesn't work.
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@bors r+ p=11 rollup=never

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bors commented Feb 11, 2020

📌 Commit 4f1f2b5 has been approved by jonas-schievink

@bors bors added the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label Feb 11, 2020
@jonas-schievink jonas-schievink added the rollup A PR which is a rollup label Feb 11, 2020
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bors commented Feb 11, 2020

⌛ Testing commit 4f1f2b5 with merge e193950a7a682952d315319eb7c01f2de7b2c055...

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The job test-various of your PR failed (pretty log, raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.
2020-02-11T14:43:37.2234905Z 
2020-02-11T14:43:37.2235869Z ---- [ui] ui/recursion/recursion.rs stdout ----
2020-02-11T14:43:37.2237514Z diff of stderr:
2020-02-11T14:43:37.2237702Z 
2020-02-11T14:43:37.2239755Z - error: overflow while checking whether `Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Nil>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>` requires drop
2020-02-11T14:43:37.2240644Z - 
2020-02-11T14:43:37.2241001Z 3 error: reached the recursion limit while instantiating `test::<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Nil>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>`
2020-02-11T14:43:37.2241629Z 5    |
2020-02-11T14:43:37.2241674Z 
2020-02-11T14:43:37.2241754Z 12 LL | | }
2020-02-11T14:43:37.2241817Z 13    | |_^
---
2020-02-11T14:43:37.2242567Z 
2020-02-11T14:43:37.2242621Z 
2020-02-11T14:43:37.2242691Z The actual stderr differed from the expected stderr.
2020-02-11T14:43:37.2243109Z Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/recursion/recursion/recursion.stderr
2020-02-11T14:43:37.2243417Z To update references, rerun the tests and pass the `--bless` flag
2020-02-11T14:43:37.2243751Z To only update this specific test, also pass `--test-args recursion/recursion.rs`
2020-02-11T14:43:37.2243894Z error: 1 errors occurred comparing output.
2020-02-11T14:43:37.2243974Z status: exit code: 1
2020-02-11T14:43:37.2243974Z status: exit code: 1
2020-02-11T14:43:37.2244894Z command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/recursion/recursion.rs" "-Zthreads=1" "--target=wasm32-unknown-unknown" "--error-format" "json" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/recursion/recursion" "-Crpath" "-Cdebuginfo=0" "-Zunstable-options" "-Lnative=/checkout/obj/build/wasm32-unknown-unknown/native/rust-test-helpers" "-C" "opt-level=0" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/recursion/recursion/auxiliary" "-A" "unused"
2020-02-11T14:43:37.2245385Z ------------------------------------------
2020-02-11T14:43:37.2245452Z 
2020-02-11T14:43:37.2245683Z ------------------------------------------
2020-02-11T14:43:37.2245782Z stderr:
2020-02-11T14:43:37.2245782Z stderr:
2020-02-11T14:43:37.2246014Z ------------------------------------------
2020-02-11T14:43:37.2246375Z error: reached the recursion limit while instantiating `test::<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Cons<Nil>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>`
2020-02-11T14:43:37.2247396Z    |
2020-02-11T14:43:37.2247396Z    |
2020-02-11T14:43:37.2247878Z LL | / fn test<T:Dot> (n:isize, i:isize, first:T, second:T) ->isize { //~ ERROR recursion limit
2020-02-11T14:43:37.2248003Z LL | |   match n {    0 => {first.dot(second)}
2020-02-11T14:43:37.2249400Z LL | |       // FIXME(#4287) Error message should be here. It should be
2020-02-11T14:43:37.2249507Z LL | |       // a type error to instantiate `test` at a type other than T.
2020-02-11T14:43:37.2249947Z LL | |     _ => {test (n-1, i+1, Cons {head:2*i+1, tail:first}, Cons{head:i*i, tail:second})}
2020-02-11T14:43:37.2250121Z LL | | }
2020-02-11T14:43:37.2250182Z    | |_^
2020-02-11T14:43:37.2250239Z 
2020-02-11T14:43:37.2250303Z error: aborting due to previous error
---
2020-02-11T14:43:37.2277659Z thread 'main' panicked at 'Some tests failed', src/tools/compiletest/src/main.rs:348:22
2020-02-11T14:43:37.2277999Z note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
2020-02-11T14:43:37.2285229Z 
2020-02-11T14:43:37.2285379Z 
2020-02-11T14:43:37.2287723Z command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/compiletest" "--compile-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib" "--run-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/wasm32-unknown-unknown/lib" "--rustc-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "--src-base" "/checkout/src/test/ui" "--build-base" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui" "--stage-id" "stage2-wasm32-unknown-unknown" "--mode" "ui" "--target" "wasm32-unknown-unknown" "--host" "x86_64-unknown-linux-gnu" "--llvm-filecheck" "/checkout/obj/build/x86_64-unknown-linux-gnu/llvm/build/bin/FileCheck" "--nodejs" "/node-v9.2.0-linux-x64/bin/node" "--host-rustcflags" "-Crpath -O -Cdebuginfo=0 -Zunstable-options  -Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--target-rustcflags" "-Crpath -O -Cdebuginfo=0 -Zunstable-options  -Lnative=/checkout/obj/build/wasm32-unknown-unknown/native/rust-test-helpers" "--docck-python" "/usr/bin/python2.7" "--lldb-python" "/usr/bin/python2.7" "--gdb" "/usr/bin/gdb" "--llvm-version" "9.0.1-rust-1.43.0-nightly\n" "--cc" "" "--cxx" "" "--cflags" "" "--llvm-components" "" "--adb-path" "adb" "--adb-test-dir" "/data/tmp/work" "--android-cross-path" "" "--color" "always"
2020-02-11T14:43:37.2288433Z 
2020-02-11T14:43:37.2288474Z 
2020-02-11T14:43:37.2298678Z failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test --target wasm32-unknown-unknown src/test/run-make src/test/ui src/test/compile-fail src/test/mir-opt src/test/codegen-units src/libcore
2020-02-11T14:43:37.2299034Z Build completed unsuccessfully in 1:25:07
2020-02-11T14:43:37.2299034Z Build completed unsuccessfully in 1:25:07
2020-02-11T14:43:37.2369278Z == clock drift check ==
2020-02-11T14:43:37.2396504Z   local time: Tue Feb 11 14:43:37 UTC 2020
2020-02-11T14:43:37.5388549Z   network time: Tue, 11 Feb 2020 14:43:37 GMT
2020-02-11T14:43:37.5395784Z == end clock drift check ==
2020-02-11T14:43:38.3650603Z 
2020-02-11T14:43:38.3726295Z ##[error]Bash exited with code '1'.
2020-02-11T14:43:38.3764629Z ##[section]Starting: Checkout rust-lang/rust@auto to s
2020-02-11T14:43:38.3766415Z ==============================================================================
2020-02-11T14:43:38.3766494Z Task         : Get sources
2020-02-11T14:43:38.3766583Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

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bors commented Feb 11, 2020

💔 Test failed - checks-azure

@bors bors added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Feb 11, 2020
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