-
Notifications
You must be signed in to change notification settings - Fork 12.7k
New issue
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
Rollup of 16 pull requests #77197
Closed
Closed
Rollup of 16 pull requests #77197
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This allows for futex or thread parking based implementations in the future.
This keeps only the `std` artifacts compiled by the given stage, not the compiler. This is useful when working on the latter stages of the compiler in tandem with the standard library, since you don't have to rebuild the *entire* compiler when the standard library changes.
Co-authored-by: varkor <github@varkor.com>
…sfackler Relax promises about condition variable. For quite a while now, there have been plans to at some point use parking_lot or some other more efficient implementation of mutexes and condition variables. Right now, Mutex and CondVar both Box the 'real' mutex/condvar inside, to give it a stable address. This was done because implementations like pthread and Windows critical sections may not be moved. More efficient implementations based on futexes, WaitOnAddress, Windows SRW locks, parking_lot, etc. may be moved (while not borrowed), so wouldn't need boxing. However, not boxing them (which would be great goal to achieve), breaks a promise std currently makes about CondVar. CondVar promises to panic when used with different mutexes, to ensure consistent behaviour on all platforms. To this check, a mutex is considered 'the same' if the address of the 'real mutex' in the Box is the same. This address doesn't change when moving a `std::mutex::Mutex` object, effectively giving it an identity that survives moves of the Mutex object. If we ever switch to a non-boxed version, they no longer carry such an identity, and this check can no longer be made. Four options: 1. Always box mutexes. 2. Add a `MutexId` similar to `ThreadId`. Making mutexes bigger, and making it hard to ever have a `const fn new` for them. 3. Making the requirement of CondVar stricter: panic if the Mutex object itself moved. 4. Making the promise of CondVar weaker: don't promise to panic. 1, 2, and 3 seem like bad options. This PR updates the documentation for 4.
Refactor memchr to allow optimization Closes #75659 The implementation already uses naive search if the slice if short enough, but the case is complicated enough to not be optimized away. This PR refactors memchr so that it exists early when the slice is short enough. Codegen-wise, as shown in #75659, memchr was not inlined previously so the only way I could find to test this is to check if there is no memchr call. Let me know if there is a more robust solution here.
Unstably allow assume intrinsic in const contexts Not sure much about this usage because there are concerns about [blocking optimization][1] and [slowing down LLVM][2] when using `assme` intrinsic in inline functions. But since Oli suggested in #76960 (comment), here we are. [1]: #54995 (comment) [2]: #49572 (comment)
BtreeMap: refactoring around edges Parts chipped off a more daring effort, that the btree benchmarks judge to be performance-neutral. r? @Mark-Simulacrum
Fix dest prop miscompilation around references Closes #77002
dead_code: look at trait impls even if they don't contain items fixes #70225
Include libunwind in the rust-src component. Some targets, such as musl, need the libunwind source to build the unwind crate (referenced [here](https://github.com/rust-lang/rust/blob/0da58007451a154da2480160429e1604a1f5f0ec/library/unwind/build.rs#L142)). Fixes rust-lang/wg-cargo-std-aware#59
…st-fn, r=oli-obk Make [].as_[mut_]ptr_range() (unstably) const. Gated behind `const_ptr_offset`, as suggested by #65807 (comment) This also marks `[].as_mut_ptr()` as const, because it's used by `as_mut_ptr_range`. I gated it behind the same feature, because I figured it's not worth adding a separate tracking issue for const `as_mut_ptr`.
clarify that `changelog-seen = 1` goes to the beginning of config.toml Fixes #77105
…crum Add `--keep-stage-std` to `x.py` for keeping only standard library artifacts Unlike `--keep-stage 0`, `--keep-stage-std 0` will allow the stage 0 compiler artifacts (i.e., stage1/bin/rustc) to be rebuilt if it has changed. This allows contributors to iterate on later stages of the compiler in tandem with the standard library without needing to to rebuild the entire compiler. I often run into this when working on const-checking, since I may need to add a feature gate or make a small tweak to the standard library.
Invalidate local LLVM cache less often This avoids a download of LLVM after every rebase. The downside to this is that if we land some patch affecting LLVM built in CI that breaks this option, but that PR does not update the LLVM submodule, we'll likely not notice until the next update -- but this seems unlikely to happen in practice and I am not personally worried about it. r? @alexcrichton
Install std for non-host targets It seems reasonable that when configuring various targets you'd expect all of them to get std installed, even if you're not building compiler toolchains for each of those. cc #76990 r? @alexcrichton
remove enum name from ImplSource variants This is quite a lot cleaner in my opinion.
…r, r=jyn514 Removing erroneous semicolon in transmute documentation There is a semicolon in the example code that causes the expected value to not be returned.
Allow multiple allow_internal_unstable attributes Fixes #77088
Remove extra space from vec drawing
📌 Commit 61b11a4 has been approved by |
bors
added
the
S-waiting-on-bors
Status: Waiting on bors to run and complete tests. Bors will change the label on completion.
label
Sep 25, 2020
I r-'d #76971. |
@bors r- |
bors
added
S-waiting-on-author
Status: This is awaiting some action (such as code changes or more information) from the author.
and removed
S-waiting-on-bors
Status: Waiting on bors to run and complete tests. Bors will change the label on completion.
labels
Sep 25, 2020
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Labels
rollup
A PR which is a rollup
S-waiting-on-author
Status: This is awaiting some action (such as code changes or more information) from the author.
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Successful merges:
changelog-seen = 1
goes to the beginning of config.toml #77106 (clarify thatchangelog-seen = 1
goes to the beginning of config.toml)--keep-stage-std
tox.py
for keeping only standard library artifacts #77120 (Add--keep-stage-std
tox.py
for keeping only standard library artifacts)Failed merges:
r? @ghost