There's now one unified way to return things from a macro, instead of
being able to choose the `AnyMacro` trait or the `MRItem`/`MRExpr`
variants of the `MacResult` enum. This does simplify the logic handling
the expansions, but the biggest value of this is it makes macros in (for
example) type position easier to implement, as there's this single thing
to modify.
By my measurements (using `-Z time-passes` on libstd and librustc etc.),
this appears to have little-to-no impact on expansion speed. There are
presumably larger costs than the small number of extra allocations and
virtual calls this adds (notably, all `macro_rules!`-defined macros have
not changed in behaviour, since they had to use the `AnyMacro` trait
anyway).
---
Summary of changes for dynamic syntax extension maintainers:
- `MacResult` is now a trait, and is returned as `~MacResult`
- `MRExpr` & `MRItem` are now `MacExpr::new` and `MacItem:new` respectively (which return `~MacResult`s)
- `MacResult::dummy_...` is `DummyResult::any` or `DummyResult::expr`
work started from @gereeter's PR: https://github.com/mozilla/rust/pull/13114
but adjusted bits
```
before
test hash::sip::tests::bench_u64 ... bench: 34 ns/iter (+/- 0)
test hash::sip::tests::bench_str_under_8_bytes ... bench: 37 ns/iter (+/- 1)
test hash::sip::tests::bench_str_of_8_bytes ... bench: 43 ns/iter (+/- 1)
test hash::sip::tests::bench_str_over_8_bytes ... bench: 50 ns/iter (+/- 1)
test hash::sip::tests::bench_long_str ... bench: 613 ns/iter (+/- 14)
test hash::sip::tests::bench_compound_1 ... bench: 114 ns/iter (+/- 11)
after
test hash::sip::tests::bench_u64 ... bench: 25 ns/iter (+/- 0)
test hash::sip::tests::bench_str_under_8_bytes ... bench: 31 ns/iter (+/- 0)
test hash::sip::tests::bench_str_of_8_bytes ... bench: 36 ns/iter (+/- 0)
test hash::sip::tests::bench_str_over_8_bytes ... bench: 40 ns/iter (+/- 0)
test hash::sip::tests::bench_long_str ... bench: 600 ns/iter (+/- 14)
test hash::sip::tests::bench_compound_1 ... bench: 64 ns/iter (+/- 6)
```
Notably it seems smaller keys will hash faster. A long string doesn't see much gains, but compound cuts in half (once compound used a `int` and `u64`).
There's now one unified way to return things from a macro, instead of
being able to choose the `AnyMacro` trait or the `MRItem`/`MRExpr`
variants of the `MacResult` enum. This does simplify the logic handling
the expansions, but the biggest value of this is it makes macros in (for
example) type position easier to implement, as there's this single thing
to modify.
By my measurements (using `-Z time-passes` on libstd and librustc etc.),
this appears to have little-to-no impact on expansion speed. There are
presumably larger costs than the small number of extra allocations and
virtual calls this adds (notably, all `macro_rules!`-defined macros have
not changed in behaviour, since they had to use the `AnyMacro` trait
anyway).
Closes#13546 (workcache: Don't assume gcc exists on all platforms)
Closes#13545 (std: Remove pub use globs)
Closes#13530 (test: Un-ignore smallest-hello-world.rs)
Closes#13529 (std: Un-ignore some float tests on windows)
Closes#13528 (green: Add a helper macro for booting libgreen)
Closes#13526 (Remove RUST_LOG="::help" from the docs)
Closes#13524 (dist: Make Windows installer uninstall first. Closes#9563)
Closes#13521 (Change AUTHORS section in the man pages)
Closes#13519 (Update GitHub's Rust projects page.)
Closes#13518 (mk: Change windows to install from stage2)
Closes#13516 (liburl doc: insert missing hyphen)
Closes#13514 (rustdoc: Better sorting criteria for searching.)
Closes#13512 (native: Fix a race in select())
Closes#13506 (Use the unsigned integer types for bitwise intrinsics.)
Closes#13502 (Add a default impl for Set::is_superset)
Previously, if statements of the form "Foo;" or "let _ = Foo;" were encountered
where Foo had a destructor, the destructors were not run. This changes
the relevant locations in trans to check for ty::type_needs_drop and invokes
trans_to_lvalue instead of trans_into.
Closes#4734Closes#6892
FreeBSD has recently moved to clang by default, and no longer ship gcc. Instead
use "cc" on unix platforms (the default compiler) and "gcc" on windows.
Exposing ctpop, ctlz, cttz and bswap as taking signed i8/i16/... is just
exposing the internal LLVM names pointlessly (LLVM doesn't have "signed
integers" or "unsigned integers", it just has sized integer types
with (un)signed *operations*).
These operations are semantically working with raw bytes, which the
unsigned types model better.
During selection, libnative would erroneously re-acquire ownership of a task
when a separate thread still had ownership of the task. The loop in select()
was rewritten to acknowledge this race and instead block waiting to re-acquire
ownership rather than plowing through.
Closes#13494
This essentially rewrites the sorting algorithm, which relied on
the implementation-defined handling of non-consistent sorting function
(cf. ECMA-262 5th edition, section 15.4.4.11)
and was also a bit inefficient.
The new criteria expands the prior criteria while adding these ones:
- The current crate is always preferred over other crates.
(Closes#13178)
- An item with a description is preferred over one without it,
if item names match. This is a heuristic assuming that
the documented item is more likely to be relevant.
- An item with no literal occurrence of search query is handled correctly.
In the past, windows was installed from stage3 to guarantee convergence between
the host and target artifacts, but syntax extensions on all platforms are
currently relying on convergence, so special casing this one platform has become
less relevant over time.
This will also have the added benefit of dealing with #13474 and #13491. These
issues will be closed after next next nightly is confirmed to fix them.
Fixes#13507.
I haven't familiarized myself with this part of the rust compiler, so hopefully there are no mistakes (despite the simplicity of the commit). It is also 5am.
This includes a change to the way lifetime names are generated. Say we
figure that `[#0, 'a, 'b]` have to be the same lifetimes, then instead
of just generating a new lifetime `'c` like before to replace them, we
would reuse `'a`. This is done so that when the lifetime name comes
from an impl, we don't give something that's completely off, and we
don't have to do much work to figure out where the name came from. For
example, for the following code snippet:
```rust
struct Baz<'x> {
bar: &'x int
}
impl<'x> Baz<'x> {
fn baz1(&self) -> &int {
self.bar
}
}
```
`[#1, 'x]` (where `#1` is BrAnon(1) and refers to lifetime of `&int`)
have to be marked the same lifetime. With the old method, we would
generate a new lifetime `'a` and suggest `fn baz1(&self) -> &'a int`
or `fn baz1<'a>(&self) -> &'a int`, both of which are wrong.
This includes a change to the way lifetime names are generated. Say we
figure that `[#0, 'a, 'b]` have to be the same lifetimes, then instead
of just generating a new lifetime `'c` like before to replace them, we
would reuse `'a`. This is done so that when the lifetime name comes
from an impl, we don't give something that's completely off, and we
don't have to do much work to figure out where the name came from. For
example, for the following code snippet:
```rust
struct Baz<'x> {
bar: &'x int
}
impl<'x> Baz<'x> {
fn baz1(&self) -> &int {
self.bar
}
}
```
`[#1, 'x]` (where `#1` is BrAnon(1) and refers to lifetime of `&int`)
have to be marked the same lifetime. With the old method, we would
generate a new lifetime `'a` and suggest `fn baz1(&self) -> &'a int`
or `fn baz1<'a>(&self) -> &'a int`, both of which are wrong.
Before, the `--crate-file-name` flag only checked crate attributes for
possible crate types. Now, if any type is specified by one or more
`--crate-type` flags, only the filenames for those types will be
emitted, and any types specified by crate attributes will be ignored.
Some of this documentation got a little out of date. There was no mention of a
`SyncSender`, and the entire "Outside the runtime" section isn't really true any
more (or really all that relevant).
This also updates a few other doc blocks and adds some examples.
This is intended to be the first thing somebody new to the language reads about Rust. It is supposed to be simple and intriguing, to give the user an idea of whether Rust is appropriate for them, and to hint that there's a lot of cool stuff to learn if they just keep diving deeper.
I'm particularly happy with the sequence of concurrency examples.
Before, normal compilation and the --crate-file-name flag would
generate output based on both #![crate_type] attributes and
--crate-type flags. Now, if one or more flag is specified by command
line, only those will be used.
Closes#11573.
This bug was introduced in #13384 by accident, and this commit continues the
work of #13384 by finishing support for loading a syntax extension crate without
registering it with the local cstore.
Closes#13495
A mismatched type with more type parameters than the expected one causes
`typeck` looking up out of the bound of type parameter vector, which
leads to ICE.
Closes#13466
This is a series of inter-related commits which depend on #13402 (Prune the paths that do not appear in the index). Please consider this as an early review request; I'll rebase this when the parent PR get merged and rebase is required.
----
This PR aims at reducing the search index without removing the actual information. In my measurement with both library and compiler docs, the search index is 52% smaller before gzipped, and 16% smaller after gzipped:
```
1719473 search-index-old.js
1503299 search-index.js (after #13402, 13% gain)
724955 search-index-new.js (after this PR, 52% gain w.r.t. #13402)
262711 search-index-old.js.gz
214205 search-index.js.gz (after #13402, 18.5% gain)
179396 search-index-new.js.gz (after this PR, 16% gain w.r.t. #13402)
```
Both the uncompressed and compressed size of the search index have been accounted. While the former would be less relevant when #12597 (Web site should be transferring data compressed) is resolved, the uncompressed index will be around for a while anyway and directly affects the UX of docs. Moreover, LZ77 (and gzip) can only remove *some* repeated strings (since its search window is limited in size), so optimizing for the uncompressed size often has a positive effect on the compressed size as well.
Each commit represents the following incremental improvements, in the order:
1. Parent paths were referred by its AST `NodeId`, which tends to be large. We don't need the actual node ID, so we remap them to the smaller sequential numbers. This also means that the list of paths can be a flat array instead of an object.
2. We remap each item type to small predefined numbers. This is strictly intended to reduce the uncompressed size of the search index.
3. We use arrays instead of objects and reconstruct the original objects in the JavaScript code. Since this removes a lot of boilerplates, this affects both the uncompressed and compressed size.
4. (I've found that a centralized `searchIndex` is easier to handle in JS, so I shot one global variable down.)
5. Finally, the repeated paths in the consecutive items are omitted (replaced by an empty string). This also greatly affects both the uncompressed and compressed size.
There had been several unsuccessful attempts to reduce the search index. Especially, I explicitly avoided complex optimizations like encoding paths in a compressed form, and only applied the optimizations when it had a substantial gain compared to the changes. Also, while I've tried to be careful, the lack of proper (non-smoke) tests makes me a bit worry; any advice on testing the search indices would be appreciated.
