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These show up in rustdoc so need to be correct.
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Redox: Fix Condvar.wait(); do not lock mutex twice
The atomic_xchg() loop locks the mutex, so the call to mutex_lock is
incorrect, and blocks.
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Fix Rustbuild linking on Illumos
Illumos (an OpenSolaris fork) expects to get several extra library references for some system functions used by Rust standard library. This commit adds required linker options to rustbuild, which is currently doesn't work on Illumos-based operating systems.
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Skip the main thread's manual stack guard on Linux
Linux doesn't allocate the whole stack right away, and the kernel has its own stack-guard mechanism to fault when growing too close to an existing mapping. If we map our own guard, then the kernel starts enforcing a rather large gap above that, rendering much of the possible stack space useless.
Instead, we'll just note where we expect rlimit to start faulting, so our handler can report "stack overflow", and trust that the kernel's own stack guard will work.
Fixes #43052.
r? @alexcrichton
### Kernel compatibility:
Strictly speaking, Rust claims support for Linux kernels >= 2.6.18, and stack guards were only added to mainline in 2.6.36 for [CVE-2010-2240]. But since that vulnerability was so severe, the guards were backported to many stable branches, and Red Hat patched this all the way back to RHEL3's 2.4.21! I think it's reasonable for us to assume that any *supportable* kernel should have these stack guards.
At that time, the kernel only enforced one page of padding between the stack and other mappings, but thanks to [Stack Clash] that padding is now much larger, causing #43052. The kernel side of those fixes are in [CVE-2017-1000364], which Red Hat has backported to at least RHEL5's 2.6.18 so far.
[CVE-2010-2240]: https://access.redhat.com/security/cve/CVE-2010-2240
[CVE-2017-1000364]: https://access.redhat.com/security/cve/CVE-2017-1000364
[Stack Clash]: https://access.redhat.com/security/vulnerabilities/stackguard
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remove associated_consts feature gate
Currently struggling to run tests locally (something about jemalloc target missing).
cc #29646
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Linux doesn't allocate the whole stack right away, and the kernel has
its own stack-guard mechanism to fault when growing too close to an
existing mapping. If we map our own guard, then the kernel starts
enforcing a rather large gap above that, rendering much of the possible
stack space useless.
Instead, we'll just note where we expect rlimit to start faulting, so
our handler can report "stack overflow", and trust that the kernel's own
stack guard will work.
Fixes #43052.
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The atomic_xchg() loop locks the mutex, so the call to mutex_lock is
incorrect, and blocks.
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Add annotations to the resize fn #39791
This adds the `inline(never)` and `cold` annotations to the
HashMap::resize function.
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Illumos (an OpenSolaris fork) expects to get several
extra library references for some system functions used
by Rust standard library. This commit adds required linker
options to rustbuild, which is currently doesn't work on
Illumos-based operating systems.
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This breaks the "single syscall rule", but it's really annoying to hand
write and is pretty foundational.
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This adds the `inline(never)` and `cold` annotations to the
HashMap::resize function.
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Switch to rust-lang-nursery/compiler-builtins
This commit migrates the in-tree `libcompiler_builtins` to the upstream version
at https://github.com/rust-lang-nursery/compiler-builtins. The upstream version
has a number of intrinsics written in Rust and serves as an in-progress rewrite
of compiler-rt into Rust. Additionally it also contains all the existing
intrinsics defined in `libcompiler_builtins` for 128-bit integers.
It's been the intention since the beginning to make this transition but
previously it just lacked the manpower to get done. As this PR likely shows it
wasn't a trivial integration! Some highlight changes are:
* The PR rust-lang-nursery/compiler-builtins#166 contains a number of fixes
across platforms and also some refactorings to make the intrinsics easier to
read. The additional testing added there also fixed a number of integration
issues when pulling the repository into this tree.
* LTO with the compiler-builtins crate was fixed to link in the entire crate
after the LTO process as these intrinsics are excluded from LTO.
* Treatment of hidden symbols was updated as previously the
`#![compiler_builtins]` crate would mark all symbol *imports* as hidden
whereas it was only intended to mark *exports* as hidden.
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rustc: Implement the #[global_allocator] attribute
This PR is an implementation of [RFC 1974] which specifies a new method of
defining a global allocator for a program. This obsoletes the old
`#![allocator]` attribute and also removes support for it.
[RFC 1974]: https://github.com/rust-lang/rfcs/pull/1974
The new `#[global_allocator]` attribute solves many issues encountered with the
`#![allocator]` attribute such as composition and restrictions on the crate
graph itself. The compiler now has much more control over the ABI of the
allocator and how it's implemented, allowing much more freedom in terms of how
this feature is implemented.
cc #27389
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This PR is an implementation of [RFC 1974] which specifies a new method of
defining a global allocator for a program. This obsoletes the old
`#![allocator]` attribute and also removes support for it.
[RFC 1974]: https://github.com/rust-lang/rfcs/pull/197
The new `#[global_allocator]` attribute solves many issues encountered with the
`#![allocator]` attribute such as composition and restrictions on the crate
graph itself. The compiler now has much more control over the ABI of the
allocator and how it's implemented, allowing much more freedom in terms of how
this feature is implemented.
cc #27389
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This commit migrates the in-tree `libcompiler_builtins` to the upstream version
at https://github.com/rust-lang-nursery/compiler-builtins. The upstream version
has a number of intrinsics written in Rust and serves as an in-progress rewrite
of compiler-rt into Rust. Additionally it also contains all the existing
intrinsics defined in `libcompiler_builtins` for 128-bit integers.
It's been the intention since the beginning to make this transition but
previously it just lacked the manpower to get done. As this PR likely shows it
wasn't a trivial integration! Some highlight changes are:
* The PR rust-lang-nursery/compiler-builtins#166 contains a number of fixes
across platforms and also some refactorings to make the intrinsics easier to
read. The additional testing added there also fixed a number of integration
issues when pulling the repository into this tree.
* LTO with the compiler-builtins crate was fixed to link in the entire crate
after the LTO process as these intrinsics are excluded from LTO.
* Treatment of hidden symbols was updated as previously the
`#![compiler_builtins]` crate would mark all symbol *imports* as hidden
whereas it was only intended to mark *exports* as hidden.
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Rollup of 8 pull requests
- Successful merges: #42227, #42836, #42975, #42994, #43041, #43042, #43043, #43045
- Failed merges:
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redox: symlink and readlink
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Convert Intos to Froms.
This is a resubmission of #42129 without `impl<T> From<Vec<T>> for Box<[T]>`.
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Make sNaN removal code tolerate different sNaN encodings
IEEE 754-1985 specifies the encoding of NaN floating point numbers,
but while it mentions that NaNs can be subdivided into signaling
and quiet ones, it doesn't fix the encoding of signaling NaNs in binary
formats. This led to different implementations (CPUs) having different
encodings. IEEE 754-2008 finally specified the encoding of signaling NaNs
but some architectures are compatible with it, while others aren't.
Certain MIPS and PA-RISC CPUs have different encodings for signaling
NaNs.
In order to have the float <-> binary cast feature of the std library be
portable to them, we don't mask any quiet NaNs like we did before (only
being compliant to IEEE 754-2008 and nothing else), but instead we
simply pass a known good NaN instead.
Note that in the code removed there was a bug; the 64 bit mask for quiet
NaNs should have been `0x0008000000000000` instead of the specified
`0x0001000000000000`.
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IEEE 754-1985 specifies the encoding of NaN floating point numbers,
but while it mentions that NaNs can be subdivided into signaling
and quiet ones, it doesn't fix the encoding of signaling NaNs in binary
formats. This led to different implementations (CPUs) having different
encodings. IEEE 754-2008 finally specified the encoding of signaling NaNs
but some architectures are compatible with it, while others aren't.
Certain MIPS and PA-RISC CPUs have different encodings for signaling
NaNs.
In order to have the float <-> binary cast feature of the std library be
portable to them, we don't mask any quiet NaNs like we did before (only
being compliant to IEEE 754-2008 and nothing else), but instead we
simply pass a known good NaN instead.
Note that in the code removed there was a bug; the 64 bit mask for quiet
NaNs should have been `0x0008000000000000` instead of the specified
`0x0001000000000000`.
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Fix Redox build, apparently broken by #42687
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Stabilize 'more_io_inner_methods' feature.
As in the title. Closes #41519.
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Revert "Stabilize RangeArgument"
This reverts commit 143206d54d7558c2326212df99efc98110904fdb.
From the discussion in #30877 it seems like this is premature.
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Document possible `io::ErrorKind`s of `fs::open`
Try to make clear that this isn't an API guarantee for now, as we likely
want to refine these errors in the future, e.g. `ENOSPC` "No space left
on device".
CC #40322
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This reverts commit 143206d54d7558c2326212df99efc98110904fdb.
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Document that `/` works as separator on Windows
Hi Whenever I see code like `Path::new("./src/bin/main.rs")` or `path.ends_with("foo/bar")`, I wonder if it will work on Windows as I expect. Unfortunately, reading the current docs does not help to answer this question, because all examples are Unix-specific.
However, I believe that using `/` is fine, because both Windows itself [and Rust stdlib](https://github.com/rust-lang/rust/blob/47faf1d51952ecd9d4c8a7325332fba34fbe00bd/src/libstd/sys/windows/path.rs#L26) do treat it as a file separator, and because it is [actually used](https://github.com/rust-lang/cargo/blob/abf01e1eddb3145c83f71b469ea7bee37141e5e1/tests/git.rs#L579) in Cargo. So looks like we can just document it?
r? @steveklabnik
cc @retep998 I don't actually program for windows that much, so I might be totally wrong, and perhaps we should advise to always use (allocating) `.join` method to construct paths of more than one component?
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Move global vars changing tests into run-pass
Should fix race #42795
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Fix Redox build, broken in ecbb896b9eb2acadefde57be493e4298c1aa04a3
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1.19 stabilization
r? @alexcrichton
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Fix NaN handling in is_sign_negative/positive
This would be my proposed fix for the #42425 provided we decide it is indeed a problem.
Note this would technically be a breaking change to a stable API. We might want to consider deprecating these methods and adding new ones.
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Try to make clear that this isn't an API guarantee for now, as we likely
want to refine these errors in the future, e.g. `ENOSPC` "No space left
on device".
CC #40322
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Reword OsStr docs to clarify that utf8 may contain nulls
The use of the word "but" in the OsStr docs implies (at least to me) that valid UTF-8 does not contain null bytes.
Using "which" instead makes it clear that valid UTF-8 may contain null bytes.
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Move it and Bound to core::ops while we're at it.
Closes #30877
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