It’s not entirely clear from the current documentation what behaviour
calling a method such as `min` on an infinite iterator like `RangeFrom`
is. One might expect this to terminate, but in fact, for infinite
iterators, `min` is always nonterminating (at least in the standard
library). This adds a quick note about this behaviour for clarification.
rustc_trans: reorganize CrateContext and rename context types.
Firstly, the `{Shared,Local}CrateContext` hasn't been meaningful for a while now, and this PR resolves it by moving all their fields to `CrateContext` and removing redundant accessor methods.
Secondly, this PR contains the following mass-renames:
* `ccx: CrateContext` -> `cx: CodegenCx`
* `mircx: MirContext` -> `fx: FunctionCx`
* `bcx: Builder` -> `bx: Builder`
r? @nikomatsakis
Remove leftover Rand stuff
The in-tree version of `rand` was removed in 6bc8f164b0, but for some reason this lone file avoided the purge. Figured it's about time to finish the job. 😈
Make ui-fulldeps/update-references executable
When a ui-fulldeps comparison fails it suggests running update-references.sh:
```
src/test/ui-fulldeps/update-references.sh 'rust/build/x86_64-apple-darwin/test/ui-fulldeps' 'resolve-error.rs'
```
This does not work as update-references.sh isn't executable. The other update-references.sh in the ui directory is already executable so this looks like an oversight.
doc: show that `f32::log` and `f64::log` are not correctly rounded
Fixes#47273.
One thing I'm not sure about is whether the "calculated as `self.ln() / base.ln()`" bit is being too specific, maybe we do not want to make this such a strong commitment. I think it's fine, but we should not make commitments in the API documentation by accident.
In case that is removed, the added sentence "`self.log2()` can ... base 10." still makes it amply clear that the `log` methods can be more inaccurate than other methods. If the above clause is removed, this second sentence can be moved to the first paragraph, kind of like the accuracy comment for the [`mul_add`](https://doc.rust-lang.org/std/primitive.f32.html#method.mul_add) method.
Add slice::ExactChunks and ::ExactChunksMut iterators
These guarantee that always the requested slice size will be returned
and any leftoever elements at the end will be ignored. It allows llvm to
get rid of bounds checks in the code using the iterator.
This is inspired by the same iterators provided by ndarray.
Fixes https://github.com/rust-lang/rust/issues/47115
I'll add unit tests for all this if the general idea and behaviour makes sense for everybody.
Also see https://github.com/rust-lang/rust/issues/47115#issuecomment-354715511 for an example what this improves.
Better Debug impl for io::Error.
This PR includes the below changes:
1. The former impl wrapped the entire thing in `Error { repr: ... }` which was unhelpful; this has been removed.
2. The `Os` variant of `io::Error` included the code and message, but not the kind; this has been fixed.
3. The `Custom` variant of `io::Error` included a `Custom(Custom { ... })`, which is now just `Custom { ... }`.
Example of previous impl:
```rust
Error {
repr: Custom(
Custom {
kind: InvalidData,
error: Error {
repr: Os {
code: 2,
message: "no such file or directory"
}
}
}
)
}
```
Example of new impl:
```rust
Custom {
kind: InvalidData,
error: Os {
code: 2,
kind: NotFound,
message: "no such file or directory"
}
}
```
When a ui-fulldeps comparison fails it suggests running
update-references.sh:
```
src/test/ui-fulldeps/update-references.sh 'rust/build/x86_64-apple-darwin/test/ui-fulldeps' 'resolve-error.rs'
```
This does not work as update-references.sh isn't executable. The other
update-references.sh in the ui directory is already executable so this looks
like an oversight.
Properly parse impls for the never type `!`
Recover from missing `for` in `impl Trait for Type`
Prohibit inherent default impls and default impls of auto traits
Change wording in more diagnostics to use "auto traits"
Some minor code cleanups in the parser
Use correct line offsets for doctests
Not yet tested.
This doesn't handle char positions. It could if I collected a map of char offsets and lines, but this is a bit more work and requires hooking into the parser much more (unsure if it's possible).
r? @QuietMisdreavus
(fixes#45868)
Implement libstd for CloudABI.
Though CloudABI is strongly inspired by POSIX, its absence of features that don't work well with capability-based sandboxing makes it different enough that adding bits to `sys/unix` will make things a mess. This change therefore adds CloudABI specific platform code under `sys/cloudabi`.
One of the goals of this implementation is to build as much as possible directly on top of CloudABI's system call layer, as opposed to using the C library. This is preferred, as the system call layer is supposed to be stable, whereas the C library ABI technically is not. An advantage of this approach is that it allows us to implement certain interfaces, such as mutexes and condition variables more optimally. They can be lighter than the ones provided by pthreads.
This change disables some modules that cannot realistically be implemented right now. For example, libstd's pathname abstraction is not designed with POSIX `*at()` (e.g., `openat()`) in mind. The `*at()` functions are the only set of file system APIs available on CloudABI. There is no global file system namespace, nor a process working directory. Discussions on how to port these modules over are outside the scope of this change.
rustc: Tweak `#[target_feature]` syntax
This is an implementation of the `#[target_feature]` syntax-related changes of
[RFC 2045][rfc]. Notably two changes have been implemented:
* The new syntax is `#[target_feature(enable = "..")]` instead of
`#[target_feature = "+.."]`. The `enable` key is necessary instead of the `+`
to indicate that a feature is being enabled, and a sub-list is used for
possible expansion in the future. Additionally within this syntax the feature
names being enabled are now whitelisted against a known set of target feature
names that we know about.
* The `#[target_feature]` attribute can only be applied to unsafe functions. It
was decided in the RFC that invoking an instruction possibly not defined for
the current processor is undefined behavior, so to enable this feature for now
it requires an `unsafe` intervention.
[rfc]: https://github.com/rust-lang/rfcs/blob/master/text/2045-target-feature.md
This is an implementation of the `#[target_feature]` syntax-related changes of
[RFC 2045][rfc]. Notably two changes have been implemented:
* The new syntax is `#[target_feature(enable = "..")]` instead of
`#[target_feature = "+.."]`. The `enable` key is necessary instead of the `+`
to indicate that a feature is being enabled, and a sub-list is used for
possible expansion in the future. Additionally within this syntax the feature
names being enabled are now whitelisted against a known set of target feature
names that we know about.
* The `#[target_feature]` attribute can only be applied to unsafe functions. It
was decided in the RFC that invoking an instruction possibly not defined for
the current processor is undefined behavior, so to enable this feature for now
it requires an `unsafe` intervention.
[rfc]: https://github.com/rust-lang/rfcs/blob/master/text/2045-target-feature.md
