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Update the stdsimd submodule
This brings in a few updates:
* Update wasm intrinsic naming for atomics
* Update and reimplement most simd128 wasm intrinsics
* Other misc improvements here and there, including a small start to
AVX-512 intrinsics
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Add `std::os::fortanix_sgx` module
This PR adds the `std::os::sgx` module to expose platform-specific APIs behind the `sgx_platform` feature gate.
Depends on https://github.com/rust-lang/rust/pull/56972 to be able to meaningfully build `std::os` documentation for non-standard targets.
Tracking issue: https://github.com/rust-lang/rust/issues/56975
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r=alexcrichton
Adding unwinding support for x86_64_fortanix_unknown_sgx target.
Unwinding support is provided by our port of LLVM's libunwind which is available from https://github.com/fortanix/libunwind/tree/release_50.
libunwind requires support for rwlock and printing to stderr, which is only provided by `std` for this target. This poses two problems: 1) how to expose the `std` functionality to C and 2) dependency inversion.
### Exposing `std`
For exposing the functionality we chose to expose the following symbols:
* __rust_rwlock_rdlock
* __rust_rwlock_wrlock
* __rust_rwlock_unlock
* __rust_print_err
* __rust_abort
Also, the following are needed from `alloc`:
* __rust_alloc
* __rust_dealloc
#### Rust RWLock in C
In `libunwind`, RWLock is initialized as a templated static variable:
```c
pthread_rwlock_t DwarfFDECache<A>::_lock = PTHREAD_RWLOCK_INITIALIZER;
```
I don't know of a good way to use the Rust sys::rwlock::RWLock type and initializer there. We could have a static global variable in Rust, but that doesn't work with the templating. The variable needs to be initialized statically, since this target doesn't support the .init section. Currently, I just used a byte array and standard C array initialization. The mapping between this C type and the Rust type needs to be manually maintained. There is a compile-time check and a unit test to make sure the Rust versions of these C definitions match the actual Rust type. If any reviewer knows of a better solution, please do tell.
### Dependency inversion issue
`std` depends on `panic_unwind` which depends on `libunwind`, and `libunwind` depends on `std`. This is not normally supported by Rust's linking system. Therefore we use raw C exports from `std` *and* `libunwind.a` is linked last in the target `post_link_objects` instead of being built as part of the Rust `libunwind`. Currently, all C exports are defined in `src/libstd/sys/sgx/rwlock.rs` to overcome LTO issues. Only the `__rust_rwlock_*` definitions *need* to live there for privacy reasons. Once again, if any reviewer knows of a better solution, please do tell.
r? @alexcrichton
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On musl targets assume certain symbols exist (like pipe2 and accept4).
This fixes #56675.
I don't know if this is the best solution, or if I should also add some tests so I'm waiting for some feedback.
Thanks!
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Always run rustc in a thread
cc @ishitatsuyuki @eddyb
r? @pnkfelix
[Previously](https://github.com/rust-lang/rust/pull/48575) we moved to only producing threads when absolutely necessary. Even before we opted to only create threads in some cases, which [is unsound](https://github.com/rust-lang/rust/pull/48575#issuecomment-380635967) due to the way we use thread local storage.
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This reverts commit 134661917bf4b086b027a2c58219d50ba57a1453.
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This brings in a few updates:
* Update wasm intrinsic naming for atomics
* Update and reimplement most simd128 wasm intrinsics
* Other misc improvements here and there, including a small start to
AVX-512 intrinsics
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Rollup of 14 pull requests (first batch)
Successful merges:
- #56562 (Update libc version required by rustc)
- #56609 (Unconditionally emit the target-cpu LLVM attribute.)
- #56637 (rustdoc: Fix local reexports of proc macros)
- #56658 (Add non-panicking `maybe_new_parser_from_file` variant)
- #56695 (Fix irrefutable matches on integer ranges)
- #56699 (Use a `newtype_index!` within `Symbol`.)
- #56702 ([self-profiler] Add column for percent of total time)
- #56708 (Remove some unnecessary feature gates)
- #56709 (Remove unneeded extra chars to reduce search-index size)
- #56744 (specialize: remove Boxes used by Children::insert)
- #56748 (Update panic message to be clearer about env-vars)
- #56749 (x86: Add the `adx` target feature to whitelist)
- #56756 (Disable btree pretty-printers on older gdbs)
- #56789 (rustc: Add an unstable `simd_select_bitmask` intrinsic)
r? @ghost
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Remove some unnecessary feature gates
fixes #56585
cc @jethrogb
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Remove dependency on shell32.dll
Closes #56510 if it works on MinGW (I've only tested it on MSVC).
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Add checked_add method to Instant time type
Appending functionality to the already opened topic of `checked_add` on time types over at #55940.
Doing checked addition between an `Instant` and a `Duration` is important to reliably determine a future instant. We could use this in the `parking_lot` crate to compute an instant when in the future to wake a thread up without risking a panic.
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* Update bootstrap compiler
* Update version to 1.33.0
* Remove some `#[cfg(stage0)]` annotations
Actually updating the version number is blocked on updating Cargo
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Ever since we added a Cargo-based build system for the compiler the
standard library has always been a little special, it's never been able
to depend on crates.io crates for runtime dependencies. This has been a
result of various limitations, namely that Cargo doesn't understand that
crates from crates.io depend on libcore, so Cargo tries to build crates
before libcore is finished.
I had an idea this afternoon, however, which lifts the strategy
from #52919 to directly depend on crates.io crates from the standard
library. After all is said and done this removes a whopping three
submodules that we need to manage!
The basic idea here is that for any crate `std` depends on it adds an
*optional* dependency on an empty crate on crates.io, in this case named
`rustc-std-workspace-core`. This crate is overridden via `[patch]` in
this repository to point to a local crate we write, and *that* has a
`path` dependency on libcore.
Note that all `no_std` crates also depend on `compiler_builtins`, but if
we're not using submodules we can publish `compiler_builtins` to
crates.io and all crates can depend on it anyway! The basic strategy
then looks like:
* The standard library (or some transitive dep) decides to depend on a
crate `foo`.
* The standard library adds
```toml
[dependencies]
foo = { version = "0.1", features = ['rustc-dep-of-std'] }
```
* The crate `foo` has an optional dependency on `rustc-std-workspace-core`
* The crate `foo` has an optional dependency on `compiler_builtins`
* The crate `foo` has a feature `rustc-dep-of-std` which activates these
crates and any other necessary infrastructure in the crate.
A sample commit for `dlmalloc` [turns out to be quite simple][commit].
After that all `no_std` crates should largely build "as is" and still be
publishable on crates.io! Notably they should be able to continue to use
stable Rust if necessary, since the `rename-dependency` feature of Cargo
is soon stabilizing.
As a proof of concept, this commit removes the `dlmalloc`,
`libcompiler_builtins`, and `libc` submodules from this repository. Long
thorns in our side these are now gone for good and we can directly
depend on crates.io! It's hoped that in the long term we can bring in
other crates as necessary, but for now this is largely intended to
simply make it easier to manage these crates and remove submodules.
This should be a transparent non-breaking change for all users, but one
possible stickler is that this almost for sure breaks out-of-tree
`std`-building tools like `xargo` and `cargo-xbuild`. I think it should
be relatively easy to get them working, however, as all that's needed is
an entry in the `[patch]` section used to build the standard library.
Hopefully we can work with these tools to solve this problem!
[commit]: https://github.com/alexcrichton/dlmalloc-rs/commit/28ee12db813a3b650a7c25d1c36d2c17dcb88ae3
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Rewrite it to not use `if let`.
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Add comments explaining how we test this,
and use a slice for debugging instead of a clone of the iterator.
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Switch to vec::IntoIter as our backing double-ended iterator.
Fix incorrect comment.
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Rollup of 7 pull requests
Successful merges:
- #56000 (Add Armv8-M Mainline targets)
- #56250 (Introduce ptr::hash for references)
- #56434 (Improve query cycle errors for parallel queries)
- #56516 (Replace usages of `..i + 1` ranges with `..=i`.)
- #56555 (Send textual profile data to stderr, not stdout)
- #56561 (Fix bug in from_key_hashed_nocheck)
- #56574 (Fix a stutter in the docs for slice::exact_chunks)
Failed merges:
r? @ghost
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The files src/libstd/sys/sgx/*.rs are mostly copied/adapted from
the wasm target.
This also updates the dlmalloc submodule to the very latest version.
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Replace usages of `..i + 1` ranges with `..=i`.
Before this change we were using old computer code techniques. After this change we use the new and improved computer code techniques.
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Avoid extra copy and syscall in std::env::current_exe
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cleanup: remove static lifetimes from consts in libstd
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