Optimize dropck
This does two things: caches the `trivial_dropck` check by making it a query, and shifts around the implementation of the primary dropck itself to avoid allocating many small vectors.
Building Servo with a recent Nightly produces:
```rust
warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
--> components/script/lib.rs:14:1
|
14 | #![plugin(script_plugins)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
|
= note: `#[warn(deprecated)]` on by default
```
First, linking to https://github.com/rust-lang/rust/issues/29597 is not ideal
since there is pretty much no discussion there of the deprecation
and what can be used instead.
This PR changes the link to the deprecation PR which does have more discussion.
Second, the “remove this attribute” suggestion is rather unhelpful.
Just because a feature is deprecated doesn’t mean that simply removing its use
without a replacement is acceptable.
In the case of custom lint, there is no replacement available.
Prefixing a message with “help:” when telling users that they’re screwed
honestly feels disrespectful.
This PR also changes the message to be more factual.
Don't recommend ONCE_INIT in std::sync::Once
ONCE_INIT is deprecated, and so suggesting it as not only being on par with, but before `Once::new` is a bad idea.
InterpCx: make memory field public
I made this field private forever ago because I thought sealing things might be nice. But with the `memory_mut` getter it doesn't actually seal anything, and it's not like we need to invalidate caches on writes to memory or so. And moreover, having to use the getters leads to some annoying borrow checking interactions.
So, let's just make it public (again).
r? @oli-obk
make File::try_clone produce non-inheritable handles on Windows
~**NOT READY FOR REVIEW.** This PR is currently mainly to trigger CI so that I can see what happens. (Is there a better way to trigger CI?) I don't know whether this change makes sense yet.~ (Edit: @Mark-Simulacrum clarified that CI doesn't currently run on Windows.)
---
File handles shouldn't be inheritable in general.
`std::process::Command` takes care of making them inheritable when child
processes are spawned, and the `CREATE_PROCESS_LOCK` protects against
races in that section on Windows. But `File::try_clone` has been
creating inheritable file descriptors outside of that lock, which could
be leaking into other child processes unintentionally.
See also https://github.com/rust-lang/rust/pull/31069#discussion_r334117665.
Move debug_map assertions after check for err
Fixes#65231
We have some assertions in `DebugMap` to catch broken implementations of `Debug` that produce malformed entries. These checks don't make sense if formatting fails partway through. This PR moves those assertions to within the `and_then` closures along with the other formatting logic, so they're only checked if the map hasn't failed to format an entry already.
rustc_metadata: replace Entry table with one table for each of its fields (AoS -> SoA).
In https://github.com/rust-lang/rust/pull/59789#issuecomment-481958212 I noticed that for many cross-crate queries (e.g. `predicates_of(def_id)`), we were deserializing the `rustc_metadata::schema::Entry` for `def_id` *only* to read one field (i.e. `predicates`).
But there are several such queries, and `Entry` is not particularly small (in terms of number of fields, the encoding itself is quite compact), so there is a large (and unnecessary) constant factor.
This PR replaces the (random-access) array¹ of `Entry` structures ("AoS"), with many separate arrays¹, one for each field that used to be in `Entry` ("SoA"), resulting in the ability to read individual fields separately, with negligible time overhead (in thoery), and some size overhead (as these arrays are not sparse).
In a way, the new approach is closer to incremental on-disk caches, which store each query's cached results separately, but it would take significantly more work to unify the two.
For stage1 `libcore`'s metadata blob, the size overhead is `8.44%`, and I have another commit (~~not initially included because I want to do perf runs with both~~ **EDIT**: added it now) that brings it down to `5.88%`.
¹(in the source, these arrays are called "tables", but perhaps they could use a better name)
Upgrade Emscripten targets to use upstream LLVM backend
- Compatible with Emscripten 1.38.46-upstream or later upstream.
- Refactors the Emscripten target spec to share code with other wasm
targets.
- Replaces the old incorrect wasm32 C call ABI with the correct one,
preserving the old one as wasm32_bindgen_compat for wasm-bindgen
compatibility.
- Updates the varargs ABI used by Emscripten and deletes the old one.
- Removes the obsolete wasm32-experimental-emscripten target.
- Uses EMCC_CFLAGS on CI to avoid the timeout problems with #63649.
r? @alexcrichton
- Compatible with Emscripten 1.38.46-upstream or later upstream.
- Refactors the Emscripten target spec to share code with other wasm
targets.
- Replaces the old incorrect wasm32 C call ABI with the correct one,
preserving the old one as wasm32_bindgen_compat for wasm-bindgen
compatibility.
- Updates the varargs ABI used by Emscripten and deletes the old one.
- Removes the obsolete wasm32-experimental-emscripten target.
- Uses EMCC_CFLAGS on CI to avoid the timeout problems with #63649.
The commit also removes the debug statement, because they annoyed me.
This change wins another 1% on `unicode_normalization`, at least partly
because it no longer needs to increment `iteration`.
Update cargo, books
## nomicon
3 commits in 4374786f0b4bf0606b35d5c30a9681f342e5707b..5004ad30d69f93553ceef74439fea2159d1f769e
2019-09-17 18:33:21 +0200 to 2019-10-12 19:52:40 +0200
- further clarify C11 and C/C++11 terminology (rust-lang-nursery/nomicon#169)
- atomics: C11 -> C++20 (rust-lang-nursery/nomicon#168)
- use sound/unsound terminology
## cargo
12 commits in a429e8cc4614a46a86322a0777a477e2baa83f1c..3a9abe3f065554a7fbc59f440df2baba4a6e47ee
2019-10-04 17:36:12 +0000 to 2019-10-15 15:55:35 +0000
- Fix typo in git index initialization error path (rust-lang/cargo#7512)
- Reject feature flags in a virtual workspace. (rust-lang/cargo#7507)
- Rename `overrides` to `package` in profiles. (rust-lang/cargo#7504)
- Allow publishing with dev-dependencies without a version. (rust-lang/cargo#7333)
- Stabilize cache-messages (rust-lang/cargo#7450)
- don't lock the package cache when cleaning target dir. (rust-lang/cargo#7502)
- Document rustc wrapper (rust-lang/cargo#7499)
- Migrate towards exclusively using serde for `Config` (rust-lang/cargo#7456)
- Re-enable some MSVC tests. (rust-lang/cargo#7492)
- when -Z unstable-options not specified, don't validate --profile (rust-lang/cargo#7489)
- Improve error message for cyclic dependencies (rust-lang/cargo#7470)
- Some minor clippy fixes. (rust-lang/cargo#7484)
## book
7 commits in 04806c80be0f54b1290287e3f85e84bdfc0b6ec7..9bb8b161963fcebc9d9ccd732ba26f42108016d5
2019-10-01 20:20:22 -0400 to 2019-10-14 18:42:55 -0500
- Make a portion of text less ambiguous (rust-lang/book#2092)
- fix heading level (rust-lang/book#2117)
- Add missing "of" before `"duck typing"`. (rust-lang/book#1951)
- ch18-03: no need to debug print destructured int (rust-lang/book#1991)
- Subtle fix to introduce ? on Option in Chapter 9.2 (rust-lang/book#2047)
- make wording clearer (rust-lang/book#1976)
- Update the version of rand we use
## rust-by-example
5 commits in a6288e7407a6c4c19ea29de6d43f40c803883f21..0b111eaae36cc4b4997684be853882a59e2c7ca7
2019-10-01 10:09:14 -0300 to 2019-10-14 18:34:25 -0300
- Some fix to three files (rust-lang/rust-by-example#1280)
- Add reference to Generics (rust-lang/rust-by-example#1281)
- Confusing and long sentence (rust-lang/rust-by-example#1282)
- Explicit mention of slice range meaning (rust-lang/rust-by-example#1277)
- Updated aliasing for nll (rust-lang/rust-by-example#1276)
