This commit updates the OS random number generator on Windows to match the
upstream implementation in the `rand` crate. First proposed in
rust-lang-nursery/rand#111 this implementation uses a "private" API of
`RtlGenRandom`. Despite the [documentation][dox] indicating this is a private
function its widespread use in Chromium and Firefox as well as [comments] from
Microsoft internally indicates that it's highly unlikely to break.
Another motivation for switching this is to also attempt to make progress
on #44911. It may be the case that this function succeeds while the previous
implementation may fail in "weird" scenarios.
[dox]: https://msdn.microsoft.com/en-us/library/windows/desktop/aa387694(v=vs.85).aspx
[comments]: https://github.com/rust-lang-nursery/rand/issues/111#issuecomment-316140155
rustdoc: add a primitive page for "unit"
In `src/libstd/primitive_docs.rs`, a `#[doc(primitive = "unit")]`
section has sat long neglected. This patch teaches rustdoc to recognize
"unit", and steals its trait implementations away from the tuple page.
Docs: a LocalKey might start in the Valid state
Add a comment to the docs for `LocalKey::state` explaining that some keys might skip the `Uninitialized` state and start in the `Valid` state.
cc #27716
r? @alexcrichton
Fix out of date unstable book entries for `alloc_*` features.
The `alloc_jemalloc` crate does not provide a type to use with `#[global_allocator]`, and (according to Alex) `extern crate alloc_jemalloc;` alone became a no-op when `#[global_allocator]` was introduced.
List of all lang items in unstable book.
I don't know how to link to the source code correctly, so I just put the information aside the lang item name.
Mention Clone and refs in --explain E0382
I followed the discussion in #42446 and came up with these additions.
- Mention references before going into traits. They're probably more likely solutions.
- Mention `Clone` before `Copy`. Cloning has wider applicability and `#derive[Copy, Clone]` makes more sense after learning about `Clone`.
The language is not great, any suggestions there would be appreciated ✨
Deprecate several flags in rustdoc
Part of #44136
cc @rust-lang/dev-tools @rust-lang/docs
This is a very basic PR to start deprecating some flags; `rustdoc` doesn't really have fancy output options like `rustc` does, so I went with `eprintln!`. Happy to change it if people feel that's not appropriate.
Also, I have no idea if we can or should write tests here, so I didn't try. If someone feels strongly about it, then let's do it, but given that the only outcome here is a side effect...
On MSVC targets rustc will add symbols prefixed with `_imp_` to LLVM modules to
"emulate" dllexported statics as that workaround is still in place after #27438
hasn't been solved otherwise. These statics, however, were getting gc'd by
ThinLTO accidentally which later would cause linking failures.
This commit updates the location we add such symbols to happen just before
codegen to ensure that (a) they're not eliminated by the optimizer and (b) the
optimizer doesn't even worry about them.
Closes#45347
Avoid unnecessary allocas for indirect function arguments
The extra alloca was only necessary because it made LLVM implicitly
handle the necessary deref to get to the actual value. The same happens
for indirect arguments that have the byval attribute. But the Rust ABI
does not use the byval attribute and so we need to manually add the
deref operation to the debuginfo.
The extra alloca was only necessary because it made LLVM implicitly
handle the necessary deref to get to the actual value. The same happens
for indirect arguments that have the byval attribute. But the Rust ABI
does not use the byval attribute and so we need to manually add the
deref operation to the debuginfo.
remove or encapsulate the remaining non-query data in tcx
I wound up removing the existing cache around inhabitedness since it didn't seem to be adding much value. I reworked const rvalue promotion, but not that much (i.e., I did not split the computation into bits, as @eddyb had tossed out as a suggestion). But it's now demand driven, at least.
cc @michaelwoerister -- see the `forbid_reads` change in last commit
r? @eddyb -- since the trickiest of this PR is the work on const rvalue promotion
cc #44137
In `src/libstd/primitive_docs.rs`, a `#[doc(primitive = "unit")]`
section has sat long neglected. This patch teaches rustdoc to recognize
"unit", and steals its trait implementations away from the tuple page.
The process for updating rustfmt is quite involved because of the way everything is configured. This section covers the steps for updating rustfmt and rationale behind them.
Update array documentation for Clone trait changes
Just a note, for this to work, `T` doesn't have to `Copy`, `Clone` is sufficient. For instance, the following works.
```rust
fn x(a: &[String; 100]) -> [String; 100] {
a.clone()
}
```
