Rollup of 15 pull requests #77198
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Rollup of 15 pull requests #77198
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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.
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
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This was referenced Sep 25, 2020
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Successful merges:
changelog-seen = 1goes to the beginning of config.toml #77106 (clarify thatchangelog-seen = 1goes to the beginning of config.toml)--keep-stage-stdtox.pyfor keeping only standard library artifacts #77120 (Add--keep-stage-stdtox.pyfor keeping only standard library artifacts)Failed merges:
r? @ghost