Auto merge of #24884 - michaelsproul:extended-errors, r=nrc
I've been working on improving the diagnostic registration system so that it can:
* Check uniqueness of error codes *across the whole compiler*. The current method using `errorck.py` is prone to failure as it relies on simple text search - I found that it breaks when referencing an error's ident within a string (e.g. `"See also E0303"`).
* Provide JSON output of error metadata, to eventually facilitate HTML output, as well as tracking of which errors need descriptions. The current schema is:
```
<error code>: {
"description": <long description>,
"use_site": {
"filename": <filename where error is used>,
"line": <line in file where error is used>
}
}
```
[Here's][metadata-dump] a pretty-printed sample dump for `librustc`.
One thing to note is that I had to move the diagnostics arrays out of the diagnostics modules. I really wanted to be able to capture error usage information, which only becomes available as a crate is compiled. Hence all invocations of `__build_diagnostics_array!` have been moved to the ends of their respective `lib.rs` files. I tried to avoid moving the array by making a plugin that expands to nothing but couldn't invoke it in item position and gave up on hackily generating a fake item. I also briefly considered using a lint, but it seemed like it would impossible to get access to the data stored in the thread-local storage.
The next step will be to generate a web page that lists each error with its rendered description and use site. Simple mapping and filtering of the metadata files also allows us to work out which error numbers are absent, which errors are unused and which need descriptions.
Alex Crichton [Wed, 29 Apr 2015 22:45:57 +0000 (15:45 -0700)]
rollup merge of #24961: nham/net_docs_cleanup
Changes made include adding missing punctuation, adding missing words, and converting uses of "Gets" to "Returns" in libstd/net/addr.rs to make it more consistent with the other documentation.
Alex Crichton [Wed, 29 Apr 2015 22:45:56 +0000 (15:45 -0700)]
rollup merge of #24953: tamird/android-pie
This is OK to do given:
- PIE is supported on Android starting with API 16.
- The bots are running API 18.
- API < 16 now has a 12.5% market share[0] as of 2015-04-29.
Alex Crichton [Wed, 29 Apr 2015 22:45:55 +0000 (15:45 -0700)]
rollup merge of #24952: pnkfelix/put-back-missing-dash-g-in-24687-test
Add `-g` (to testcase) that I should have included in PR #24932.
Note it is safe, with respect to autobuilds, to land before #24945.
(In other words, landing this sooner won't break things for anyone any
worse than they were already broken, since there are *other* tests
that also add `-g` to their flags via `compile-flags: -g`.)
Alex Crichton [Wed, 29 Apr 2015 22:45:54 +0000 (15:45 -0700)]
rollup merge of #24945: pnkfelix/fixes-for-dash-g-handling
Fixes for -g handling
First:
* decouples our handling of `-g` for the test suite from our handling of `-g` for the rest of the compiler/stdlib building.
* Namely, if you do `--enable-debug` or `--enable-debuginfo`, that should only affect `rustc` and the standard library crates; the tests should all continue to compile without `-g` unless:
* you pass `--enable-debuginfo-tests`, or
* the test itself requests the `-g` option (e.g. via a `// compile-flags: -g` embedded comment).
Second:
* Makes `rustc` more flexible in that it now accepts multiple occurrences of `-g -g`
* (as a drive-by, I gave `-O` the same treatment: multiple occurrences of `-O` are treated as synonymous as a single occurrence of `-O`.
Alex Crichton [Wed, 29 Apr 2015 22:45:51 +0000 (15:45 -0700)]
rollup merge of #24931: jooert/patch-1
Since #24783, the style guidelines recommend that unit tests should live in a submodule `tests` rather than `test` to not clash with the possible use of libtest. This is especially important for benchmark tests as they require libtest. Fixes #24923.
Alex Crichton [Wed, 29 Apr 2015 22:45:45 +0000 (15:45 -0700)]
rollup merge of #24908: inrustwetrust/once_memory_ordering
`call_once` guarantees that there is a happens-before relationship between its closure and code following it via the sequentially consistent atomic store/loads of `self.cnt`.
Alex Crichton [Wed, 29 Apr 2015 22:45:42 +0000 (15:45 -0700)]
rollup merge of #24886: GBGamer/master
These are useful when you want to catch the signals, like when you're making a kernel, or if you just don't want the overhead. (I don't know if there are any of the second kind of people, I don't think it's a good idea, but hey, choice is good).
To improve the codegen, we can zero extend the 8 bit integer, then set
bit 8 and perform a cttz operation on the extended value. That way
there's no conditional operation involved at all.
This was discovered by this benchmark: https://github.com/Kimundi/long_strings_without_repeats
Timings on my box with the current nightly:
```
running 4 tests
test bench_cpp_naive_big ... bench: 5479222 ns/iter (+/- 254222)
test bench_noop_big ... bench: 571405 ns/iter (+/- 111950)
test bench_rust_naive_big ... bench: 7798102 ns/iter (+/- 148841)
test bench_rust_unsafe_big ... bench: 6606488 ns/iter (+/- 67529)
```
Timings with the patch applied:
```
running 4 tests
test bench_cpp_naive_big ... bench: 5470944 ns/iter (+/- 7109)
test bench_noop_big ... bench: 568944 ns/iter (+/- 6895)
test bench_rust_naive_big ... bench: 6795901 ns/iter (+/- 43806)
test bench_rust_unsafe_big ... bench: 5584879 ns/iter (+/- 5291)
```
Alex Crichton [Wed, 29 Apr 2015 22:45:34 +0000 (15:45 -0700)]
rollup merge of #24711: alexcrichton/fs2.1
This commit is an implementation of [RFC 1044][rfc] which adds additional
surface area to the `std::fs` module. All new APIs are `#[unstable]` behind
assorted feature names for each one.
* `fs::canonicalize` - bindings to `realpath` on unix and
`GetFinalPathNameByHandle` on windows.
* `fs::symlink_metadata` - similar to `lstat` on unix
* `fs::FileType` and accessor methods as `is_{file,dir,symlink}`
* `fs::Metadata::file_type` - accessor for the raw file type
* `fs::DirEntry::metadata` - acquisition of metadata which is free on Windows
but requires a syscall on unix.
* `fs::DirEntry::file_type` - access the file type which may not require a
syscall on most platforms.
* `fs::DirEntry::file_name` - access just the file name without leading
components.
* `fs::PathExt::symlink_metadata` - convenience method for the top-level
function.
* `fs::PathExt::canonicalize` - convenience method for the top-level
function.
* `fs::PathExt::read_link` - convenience method for the top-level
function.
* `fs::PathExt::read_dir` - convenience method for the top-level
function.
* `std::os::raw` - type definitions for raw OS/C types available on all
platforms.
* `std::os::$platform` - new modules have been added for all currently supported
platforms (e.g. those more specific than just `unix`).
* `std::os::$platform::raw` - platform-specific type definitions. These modules
are populated with the bare essentials necessary for lowing I/O types into
their raw representations, and currently largely consist of the `stat`
definition for unix platforms.
This commit also deprecates `Metadata::{modified, accessed}` in favor of
inspecting the raw representations via the lowering methods of `Metadata`.
Nick Hamann [Wed, 29 Apr 2015 21:24:44 +0000 (16:24 -0500)]
Improve libstd/net/addr.rs documentation.
This adds some missing punctuation and converts uses of "Gets" to
"Returns". This sounds better to my ear, but more importantly is
more consistent with the documentation from other files.
Nick Hamann [Wed, 29 Apr 2015 20:57:17 +0000 (15:57 -0500)]
Improve libstd/net/udp.rs documentation.
This adds some missing punctuation, adds a missing word, and
corrects a bug in the description of `send_to`, which actually
returns the number of bytes written on success.
This is OK to do given:
- PIE is supported on Android starting with API 16.
- The bots are running API 18.
- API < 16 now has a 12.5% market share[0] as of 2015-04-29.
Unfortunately, this breaks backtrace support. See #17520.
Add `-g` that I should have included in PR #24932.
Note it is safe, with respect to autobuilds, to land before #24945.
(In other words, landing this sooner won't break things for anyone any
worse than they were already broken, since there are *other* tests
that also add `-g` to their flags via `compile-flags: -g`.)
add `--enable-debuginfo-tests`, analogous to `--disable-optimize-tests`.
Then, decouple the question of whether the compiler/stdlib carry
debuginfo (which is controlled via `--enable-debuginfo` and implied by
`--enable-debug`) from the question of whether the tests carry
debuginfo (which now no longer is implied by `--enable-debug` nor
`--enable-debuginfo`, and is off by default).
Alex Crichton [Mon, 27 Apr 2015 20:44:20 +0000 (13:44 -0700)]
std: Fix inheriting standard handles on windows
Currently if a standard I/O handle is set to inherited on Windows, no action is
taken and the slot in the process information description is set to
`INVALID_HANDLE_VALUE`. Due to our passing of `STARTF_USESTDHANDLES`, however,
this means that the handle is actually set to nothing and if a child tries to
print it will generate an error.
This commit fixes this behavior by explicitly creating stdio handles to be
placed in these slots by duplicating the current process's I/O handles. This is
presumably what previously happened silently by using a file-descriptor-based
implementation instead of a `HANDLE`-centric implementation.
Along the way this cleans up a lot of code in `Process::spawn` for Windows by
ensuring destructors are always run, using more RAII, and limiting the scope of
`unsafe` wherever possible.
which has some unnecessary overhead, having two conditional moves.
To improve the codegen, we can zero extend the 8 bit integer, then set
bit 8 and perform a cttz operation on the extended value. That way
there's no conditional operation involved at all.
Auto merge of #24932 - pnkfelix:fix-issue-24687, r=huonw
metdata: Fix zero-normalization of the pos of a `MultiByteChar`
Fix #24687
The source byte/character mappings for every crate track the collection of multi-characters from its source files specially. When we import the source information for another file into the current compilation unit, we assign its byte-positions unique values by shifting them all by a fixed adjustment, tracked in the `start_pos` field. But when we pull out the source span information for one function from one crate and into our own crate, we need to re-normalize the byte positions: subtracting the old `start_pos` and adding the new `start_pos`. The `new_imported_filemap(..)` method handles adding the new `start_pos`, so all `creader` needs to do is re-normalize each `pos` to zero.
It seems like it was indeed trying to do this, but it mistakenly added the old `start_pos` instead of subtracting it.
Since #24783, the style guidelines recommend that unit tests should live in a submodule `tests` rather than `test` to not clash with the possible use of libtest. This is especially important for benchmark tests as they require libtest. Fixes #24923.
Auto merge of #24681 - tamird:unignore-android, r=alexcrichton
There are still quite a few ignored Android tests kicking around, most of which were added in 445faca8441aae34c91318b6ad9e2049885af8dc, which has a pretty unfortunate commit message.
Auto merge of #24865 - bluss:range-size, r=alexcrichton
core: Fix size_hint for signed integer `Range<T>` iterators
There was an overflow bug in .size_hint() for signed iterators, which
produced an hilariously incorrect size or an overflow panic.
Incorrect size is a serious bug since the iterators are marked
ExactSizeIterator. (And leads to abort() on (-1i8..127).collect() when
the collection tries to preallocate too much).
Auto merge of #24781 - bluss:vec-drain-range, r=alexcrichton
Implement Vec::drain(\<range type\>) from rust-lang/rfcs#574, tracking issue #23055.
This is a big step forward for vector usability. This is an introduction of an API for removing a range of *m* consecutive elements from a vector, as efficently as possible.
New features:
- Introduce trait `std::collections::range::RangeArgument` implemented by all four built-in range types.
- Change `Vec::drain()` to use `Vec::drain<R: RangeArgument>(R)`
Implementation notes:
- Use @Gankro's idea for memory safety: Use `set_len` on the source vector when creating the iterator, to make sure that the part of the vector that will be modified is unreachable. Fix up things in Drain's destructor — but even if it doesn't run, we don't expose any moved-out-from slots of the vector.
- This `.drain<R>(R)` very close to how it is specified in the RFC.
- Introduced as unstable
- Drain reuses the slice iterator — copying and pasting the same iterator pointer arithmetic again felt very bad
- The `usize` index as a range argument in the RFC is not included. The ranges trait would have to change to accomodate it.
Please help me with:
- Name and location of the new ranges trait.
- Design of the ranges trait
- Understanding Niko's comments about variance (Note: for a long time I was using a straight up &mut Vec in the iterator, but I changed this to permit reusing the slice iterator).
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