Rollup of 16 pull requests #58664
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Rollup of 16 pull requests #58664
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Specialize Iterator::try_fold and DoubleEndedIterator::try_rfold to improve code generation in all internal iteration scenarios. This changes brings the performance of internal iteration with RangeInclusive on par with the performance of iteration with Range: - Single conditional jump in hot loop, - Unrolling and vectorization, - And even Closed Form substitution. Unfortunately, it only applies to internal iteration. Despite various attempts at stream-lining the implementation of next and next_back, LLVM has stubbornly refused to optimize external iteration appropriately, leaving me with a choice between: - The current implementation, for which Closed Form substitution is performed, but which uses 2 conditional jumps in the hot loop when optimization fail. - An implementation using a "is_done" boolean, which uses 1 conditional jump in the hot loop when optimization fail, allowing unrolling and vectorization, but for which Closed Form substitution fails. In the absence of any conclusive evidence as to which usecase matters most, and with no assurance that the lack of Closed Form substitution is not indicative of other optimizations being foiled, there is no way to pick one implementation over the other, and thus I defer to the statu quo as far as next and next_back are concerned.
… the move was partial
if security_qos_flags(SECURITY_ANONYMOUS) is set
Co-Authored-By: oli-obk <[email protected]>
It is currently a method of `Token`, but it only is valid to call if `self` is a `Token::Interpolated`. This commit eliminates the possibility of misuse by changing it to an associated function that takes a `Nonterminal`, which also simplifies the call sites. This requires splitting out a new function, `nonterminal_to_string`.
It's present within `Token::Interpolated` as an optimization, so that if a nonterminal is converted to a `TokenStream` multiple times, the first-computed value is saved and reused. But in practice it's not needed. `interpolated_to_tokenstream()` is a cold function: it's only called a few dozen times while compiling rustc itself, and a few hundred times across the entire `rustc-perf` suite. Furthermore, when it is called, it is almost always the first conversion, so no benefit is gained from it. So this commit removes `LazyTokenStream`, along with the now-unnecessary `Token::interpolated()`. As well as a significant simplification, the removal speeds things up slightly, mostly due to not having to `drop` the `LazyTokenStream` instances.
The current code (expensively) clones the value within an `Rc`. This commit changes things so that the `Rc` itself is (cheaply) cloned instead, avoid some allocations. This requires converting a few `Rc` instances to `Lrc`.
Nowadays booleans have a well-defined representation, so there is no reason not to optimise their allocation.
…simple.rs test. (and now unignore the test since it shouldn't break tests of cross-compiles anymore.)
AFAICT, we do not have the same const-eval issues that we used to when rust-lang#23926 was filed. (Probably because of the switch to miri for const-evaluation.)
RangeInclusive internal iteration performance improvement. Specialize `Iterator::try_fold` and `DoubleEndedIterator::try_rfold` to improve code generation in all internal iteration scenarios. This changes brings the performance of internal iteration with `RangeInclusive` on par with the performance of iteration with `Range`: - Single conditional jump in hot loop, - Unrolling and vectorization, - And even Closed Form substitution. Unfortunately, it only applies to internal iteration. Despite various attempts at stream-lining the implementation of `next` and `next_back`, LLVM has stubbornly refused to optimize external iteration appropriately, leaving me with a choice between: - The current implementation, for which Closed Form substitution is performed, but which uses 2 conditional jumps in the hot loop when optimization fail. - An implementation using a `is_done` boolean, which uses 1 conditional jump in the hot loop when optimization fail, allowing unrolling and vectorization, but for which Closed Form substitution fails. In the absence of any conclusive evidence as to which usecase matters most, and with no assurance that the lack of Closed Form substitution is not indicative of other optimizations being foiled, there is no way to pick one implementation over the other, and thus I defer to the statu quo as far as `next` and `next_back` are concerned.
…stebank Add better error message for partial move closes rust-lang#56657 r? @davidtwco
Set secure flags when opening a named pipe on Windows Fixes rust-lang#42036, see also the previous attempt in rust-lang#44556. Whether this is correct depends on if it is somehow possible to create a symlink to a named pipe, outside the named pipe filesystem (NPFS). But as far as I can tell that should be impossible. Also fixes that `security_qos_flags(SECURITY_ANONYMOUS)` does not set the `SECURITY_SQOS_PRESENT` flag, and the incorrect documentation about the default value of `security_qos_flags`.
Implement unstable ffi_return_twice attribute This PR implements [RFC2633](rust-lang/rfcs#2633) r? @eddyb
…nts, r=arielb1 Check the Self-type of inherent associated constants r? @arielb1
SGX target: fix panic = abort What is the difference between `no_mangle` and `rustc_std_internal_symbol`?
…hton Refactor Windows stdio and remove stdin double buffering I was looking for something nice and small to work on, tried to tackle a few FIXME's in Windows stdio, and things grew from there. This part of the standard library contains some tricky code, and has changed over the years to handle more corner cases. It could use some refactoring and extra comments. Changes/fixes: - Made `StderrRaw` `pub(crate)`, to remove the `Write` implementations on `sys::Stderr` (used unsynchronised for panic output). - Remove the unused `Read` implementation on `sys::windows::stdin` - The `windows::stdio::Output` enum made sense when we cached the handles, but we can use simple functions like `is_console` now that we get the handle on every read/write - `write` can now calculate the number of written bytes as UTF-8 when we can't write all `u16`s. - If `write` could only write one half of a surrogate pair, attempt another write for the other because user code can't reslice in any way that would allow us to write it otherwise. - Removed the double buffering on stdin. Documentation on the unexposed `StdinRaw` says: 'This handle is not synchronized or buffered in any fashion'; which is now true. - `sys::windows::Stdin` now always only partially fills its buffer, so we can guarantee any arbitrary UTF-16 can be re-encoded without losing any data. - `sys::windows::STDIN_BUF_SIZE` is slightly larger to compensate. There should be no real change in the number of syscalls the buffered `Stdin` does. This buffer is a little larger, while the extra buffer on Stdin is gone. - `sys::windows::Stdin` now attempts to handle unpaired surrogates at its buffer boundary. - `sys::windows::Stdin` no langer allocates for its buffer, but the UTF-16 decoding still does. ### Testing I did some manual testing of reading and writing to console. The console does support UTF-16 in some sense, but doesn't supporting displaying characters outside the BMP. - compile stage 1 stdlib with a tiny value for `MAX_BUFFER_SIZE` to make it easier to catch corner cases - run a simple test program that reads on stdin, and echo's to stdout - write some lines with plenty of ASCII and emoji in a text editor - copy and paste in console to stdin - return with `\r\n\` or CTRL-Z - copy and paste in text editor - check it round-trips ----- Fixes rust-lang#23344. All but one of the suggestions in that issue are now implemented. the missing one is: > * When reading data, we require the entire set of input to be valid UTF-16. We should instead attempt to read as much of the input as possible as valid UTF-16, only returning an error for the actual invalid elements. For example if we read 10 elements, 5 of which are valid UTF-16, the 6th is bad, and then the remaining are all valid UTF-16, we should probably return the first 5 on a call to `read`, then return an error, then return the remaining on the next call to `read`. Stdin in Console mode is dealing with text directly input by a user. In my opinion getting an unpaired surrogate is quite unlikely in that case, and a valid reason to error on the entire line of input (which is probably short). Dealing with it is incompatible with an unbuffered stdin, which seems the more interesting guarantee to me.
…etrochenkov Remove `LazyTokenStream`. `LazyTokenStream` was added in rust-lang#40939. Perhaps it was an effective optimization then, but no longer. This PR removes it, making the code both simpler and faster. r? @alexcrichton
Const to op simplification r? @RalfJung alternative to rust-lang#58486
…iated, r=oli-obk Turn duration consts into associated consts As suggested in rust-lang#57391 (comment), I'm moving `Duration` constants (`SECOND`, `MILLISECOND` and so on; currently behind unstable `duration_constants` feature) into the `impl Duration` block. cc @frewsxcv @SimonSapin
Allow Self::Module to be mutated. This only changes `&Self::Module` to `&mut Self::Module` in a couple of places. `codegen_allocator` and `write_metadata` from `ExtraBackendMethods` mutate the underlying LLVM module. As such, it makes sense for these two functions to receive a mutable reference to the module (as opposed to an immutable one). I am trying to implement `codegen_allocator` for my backend, and I need to be able to mutate `Self::Module`: https://github.com/rust-lang/rust/blob/f66e4697ae286985ddefc53c3a047614568458bb/src/librustc_codegen_ssa/traits/backend.rs#L41 Modifying the module in `codegen_allocator`/`write_metadata` is not a problem for the LLVM backend, because [ModuleLlvm](https://github.com/rust-lang/rust/blob/master/src/librustc_codegen_llvm/lib.rs#L357) contains a raw pointer to the underlying LLVM module, so it can easily be mutated through FFI calls. I am trying to avoid interior mutability and `unsafe` as much as I can. What do you think? Does this change make sense, or is there a reason why this should stay the way it is?
…-obk Optimise vec![false; N] to zero-alloc Nowadays booleans have a well-defined representation, so there is no reason not to optimise their allocation.
… r=GuillaumeGomez rustdoc: support methods on primitives in intra-doc links Fixes rust-lang#58598.
…anishearth Don't generate minification variables if minification disabled If the minification is disabled, there is no sense having those variables. r? @QuietMisdreavus
…r=nikomatsakis Update tests to account for cross-platform testing and miri. Fix rust-lang#23926
Do not underflow after resetting unmatched braces count Fix rust-lang#58638. r? @oli-obk
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@bors r+ p=16 |
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📌 Commit de703e7 has been approved by |
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Successful merges:
LazyTokenStream. #58476 (RemoveLazyTokenStream.)Failed merges:
r? @ghost