Don't normalize opaque types with escaping late-bound regions.
Turns out, this has some really bad perf implications in large types (issue #88862). While we technically can handle them fine, it doesn't change test output either way. For now, revert with an added benchmark. Future attempts to change this back will have to consider perf.
Auto merge of #89144 - sexxi-goose:insig_stdlib, r=nikomatsakis
2229: Mark insignificant dtor in stdlib
I looked at all public [stdlib Drop implementations](https://doc.rust-lang.org/stable/std/ops/trait.Drop.html#implementors) and categorized them into Insigificant/Maybe/Significant Drop.
Reasons are noted here: https://docs.google.com/spreadsheets/d/19edb9r5lo2UqMrCOVjV0fwcSdS-R7qvKNL76q7tO8VA/edit#gid=1838773501
One thing missing from this PR is tagging HashMap as insigificant destructor as that needs some discussion.
* Make define_global() return a RValue directly
* Return LValue in functions declaring a global variable
* Remove useless cast
* Fix bytes_in_context to use an array rvalue
* Remove global_names which is unused
* Make const_struct create a constant struct
* Correctly initialize global in static_addr_of_mut
* Fix global variable initialization
* Remove workaround for ARGV
Auto merge of #88316 - est31:remove_box_tests, r=Mark-Simulacrum
Remove most box syntax uses from the testsuite except for src/test/ui/issues
Removes most box syntax uses from the testsuite outside of the src/test/ui/issues directory. The goal was to only change tests where box syntax is an implementation detail instead of the actual feature being tested. So some tests were left out, like the regression test for #87935, or tests where the obtained error message changed significantly.
Mostly this replaces box syntax with `Box::new`, but there are some minor drive by improvements, like formatting improvements or `assert_eq` instead of `assert!( == )`.
Prior PR that removed box syntax from the compiler and tools: #87781
Auto merge of #89101 - ehuss:compiletest-incremental-build, r=Mark-Simulacrum
Support incremental in compiletest for non-incremental modes.
This adds first-class support for using incremental builds in non-incremental-mode tests. These tests previously manually passed `-C incremental=tmp/foo` which resulted in reusing the same tmp folder between runs. This means that these tests could fail whenever the on-disk incremental format changed (such as when updating one's local source tree). This changes it so that these tests can pass a `// incremental-build` header which instructs compiletest to create a set aside a dedicated incremental directory which will be cleared before the test starts to ensure it has a clean slate.
Auto merge of #88680 - ehuss:more-attr-validation, r=petrochenkov
Validate builtin attributes for macro args.
This adds some validation for `path`, `crate_type`, and `recursion_limit` attributes so that they will now return an error if you attempt to pass a macro into them (such as `#[path = foo!()]`). Previously, the attribute would be completely ignored. These attributes are special because their values need to be known before/during expansion.
Auto merge of #89262 - Manishearth:rollup-vtkbetm, r=Manishearth
Rollup of 7 pull requests
Successful merges:
- #88895 (rustdoc: Cleanup `clean` part 2)
- #88973 (Expose the std_detect env_override feature)
- #89010 (Add some intra doc links)
- #89198 (rustdoc: Don't show hidden trait methods)
- #89216 (Consistent big O notation)
- #89224 (Change the order of imports suggestions)
- #89256 (Fix typo in release notes)
Now `Fields` is just a `Vec` of patterns, with some extra info on the
side to reconstruct patterns when needed. This emphasizes that this
extra info is not central to the algorithm.
Auto merge of #88343 - steffahn:fix_code_spacing, r=jyn514
Fix spacing of links in inline code.
Similar to #80733, but the focus is different. This PR eliminates all occurrences of pieced-together inline code blocks like [`Box`]`<`[`Option`]`<T>>` and replaces them with good-looking ones (using HTML-syntax), like <code>[Box]<[Option]\<T>></code>. As far as I can tell, I should’ve found all of these in the standard library (regex search with `` r"`\]`|`\[`" ``) \[except for in `core::convert` where I’ve noticed other things in the docs that I want to fix in a separate PR]. In particular, unlike #80733, I’ve added almost no new instance of inline code that’s broken up into multiple links (or some link and some link-free part). I also added tooltips (the stuff in quotes for the markdown link listings) in places that caught my eye, but that’s by no means systematic, just opportunistic.
Context: I got annoyed by repeatedly running into new misformatted inline code while reading the standard library docs. I know that once issue #83997 (and/or related ones) are resolved, these changes become somewhat obsolete, but I fail to notice much progress on that end right now.
Frank Steffahn [Wed, 25 Aug 2021 09:45:08 +0000 (11:45 +0200)]
Apply 16 commits (squashed)
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Fix spacing for links inside code blocks, and improve link tooltips in alloc::fmt
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Fix spacing for links inside code blocks, and improve link tooltips in alloc::{rc, sync}
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Fix spacing for links inside code blocks, and improve link tooltips in alloc::string
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Fix spacing for links inside code blocks in alloc::vec
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Fix spacing for links inside code blocks in core::option
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Fix spacing for links inside code blocks, and improve a few link tooltips in core::result
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Fix spacing for links inside code blocks in core::{iter::{self, iterator}, stream::stream, poll}
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Fix spacing for links inside code blocks, and improve a few link tooltips in std::{fs, path}
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Fix spacing for links inside code blocks in std::{collections, time}
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Fix spacing for links inside code blocks in and make formatting of `&str`-like types consistent in std::ffi::{c_str, os_str}
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Fix spacing for links inside code blocks, and improve link tooltips in std::ffi
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Fix spacing for links inside code blocks, and improve a few link tooltips
in std::{io::{self, buffered::{bufreader, bufwriter}, cursor, util}, net::{self, addr}}
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Fix typo in link to `into` for `OsString` docs
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Remove tooltips that will probably become redundant in the future
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Apply suggestions from code review
Replacing `…std/primitive.reference.html` paths with just `reference`
Co-authored-by: Joshua Nelson <github@jyn.dev>
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Also replace `…std/primitive.reference.html` paths with just `reference` in `core::pin`
Aaron Hill [Sat, 25 Sep 2021 18:04:00 +0000 (13:04 -0500)]
Don't anonymize bound region names during typeck
Once this anonymization has performed, we have no
way of recovering the original names during NLL
borrow checking. Keeping the original names allows
error messages in full NLL mode to contain the original
bound region names.
As a result, the typeck results may contain types that
differ only in the names used for their bound regions. However,
anonimization of bound regions does not guarantee that
all distinct types are unqual (e.g. not subtypes of each other).
For example, `for<'a> fn(&'a u32, &'a u32)` and
`for<'b, 'c> fn(&'b u32, &'c u32)` are subtypes of each other,
as explained here:
Aaron Hill [Thu, 16 Sep 2021 20:01:22 +0000 (15:01 -0500)]
Use larger span for adjustments on method calls
Currently, we use a relatively 'small' span for THIR
expressions generated by an 'adjustment' (e.g. an autoderef,
autoborrow, unsizing). As a result, if a borrow generated
by an adustment ends up causing a borrowcheck error, for example:
```rust
let mut my_var = String::new();
let my_ref = &my_var
my_var.push('a');
my_ref;
```
then the span for the mutable borrow may end up referring
to only the base expression (e.g. `my_var`), rather than
the method call which triggered the mutable borrow
(e.g. `my_var.push('a')`)
Due to a quirk of the MIR borrowck implementation,
this doesn't always get exposed in migration mode,
but it does in many cases.
This commit makes THIR building consistently use 'larger'
spans for adjustment expressions
The intent of this change it make it clearer to users
when it's the specific way in which a variable is
used (for example, in a method call) that produdes
a borrowcheck error. For example, an error message
claiming that a 'mutable borrow occurs here' might
be confusing if it just points at a usage of a variable
(e.g. `my_var`), when no `&mut` is in sight. Pointing
at the entire expression should help to emphasize
that the method call itself is responsible for
the mutable borrow.
In several cases, this makes the `#![feature(nll)]` diagnostic
output match up exactly with the default (migration mode) output.
As a result, several `.nll.stderr` files end up getting removed
entirely.
The new pass manager is enabled by default in clang since Clang/LLVM 13. Per the recent discussion on llvm-dev (https://lists.llvm.org/pipermail/llvm-dev/2021-August/152305.html) the legacy pass manager will be unmaintained in LLVM 14 and removed entirely in LLVM 15.
This switches us to use the new pass manager if LLVM >= 13 is used. It's possible to still use the old pass manager using `-Z new-llvm-pass-manager=no`.
Auto merge of #89030 - nbdd0121:box2, r=jonas-schievink
Introduce `Rvalue::ShallowInitBox`
Polished version of #88700.
Implements MCP rust-lang/compiler-team#460, and should allow #43596 to go forward.
In short, creating an empty box is split from a nullary-op `NullOp::Box` into two steps, first a call to `exchange_malloc`, then a `Rvalue::ShallowInitBox` which transmutes `*mut u8` to a shallow-initialized `Box<T>`. This allows the `exchange_malloc` call to unwind. Details can be found in the MCP.
`NullOp::Box` is not yet removed, purely to make reverting easier in case anything goes wrong as the result of this PR. If revert is needed a reversion of "Use Rvalue::ShallowInitBox for box expression" commit followed by a test bless should be sufficient.
Experiments in #88700 showed a very slight compile-time perf regression due to (supposedly) slightly more time spent in LLVM. We could omit unwind edge generation (in non-`oom=panic` case) in box expression MIR construction to restore perf; but I don't think it's necessary since runtime perf isn't affected and perf difference is rather small.
Auto merge of #89030 - nbdd0121:box2, r=jonas-schievink
Introduce `Rvalue::ShallowInitBox`
Polished version of #88700.
Implements MCP rust-lang/compiler-team#460, and should allow #43596 to go forward.
In short, creating an empty box is split from a nullary-op `NullOp::Box` into two steps, first a call to `exchange_malloc`, then a `Rvalue::ShallowInitBox` which transmutes `*mut u8` to a shallow-initialized `Box<T>`. This allows the `exchange_malloc` call to unwind. Details can be found in the MCP.
`NullOp::Box` is not yet removed, purely to make reverting easier in case anything goes wrong as the result of this PR. If revert is needed a reversion of "Use Rvalue::ShallowInitBox for box expression" commit followed by a test bless should be sufficient.
Experiments in #88700 showed a very slight compile-time perf regression due to (supposedly) slightly more time spent in LLVM. We could omit unwind edge generation (in non-`oom=panic` case) in box expression MIR construction to restore perf; but I don't think it's necessary since runtime perf isn't affected and perf difference is rather small.
Make expectation in panic-in-drop-abort.rs test more precise
Check whether a call/invoke of the function exists, but don't
match a leftover function declaration.
Also remove the CHECK-LABELs: In panic-in-drop=unwind mode the
call will not actually be in either of those functions, so
remove the restriction and look for any calls.
Nikita Popov [Sat, 21 Aug 2021 20:20:32 +0000 (22:20 +0200)]
Enable new pass manager on LLVM 13
The new pass manager is enabled by default in clang since
Clang/LLVM 13. While the discussion about this is still ongoing
(https://lists.llvm.org/pipermail/llvm-dev/2021-August/152305.html)
it's expected that support for the legacy pass manager will be
dropped either in LLVM 14 or 15.
This switches us to use the new pass manager if LLVM >= 13 is used.
Auto merge of #89237 - BoxyUwU:trackersMcCaller, r=eddyb
make `#[track_caller]` actually do stuff in `Steal::borrow`
makes this ICE message useful:
``thread 'rustc' panicked at 'attempted to read from stolen value', /rustc/ac2d9fc509e36d1b32513744adf58c34bcc4f43c\compiler\rustc_data_structures\src\steal.rs:37:21``
Auto merge of #89230 - workingjubilee:rollup-1swktdq, r=workingjubilee
Rollup of 8 pull requests
Successful merges:
- #88893 (Add 1.56.0 release notes)
- #89001 (Be explicit about using Binder::dummy)
- #89072 (Avoid a couple of Symbol::as_str calls in cg_llvm )
- #89104 (Simplify scoped_thread)
- #89208 ([rfc 2229] Drop fully captured upvars in the same order as the regular drop code)
- #89210 (Add missing time complexities to linked_list.rs)
- #89217 (Enable "generate-link-to-definition" option on rust tools docs as well)
- #89221 (Give better error for `macro_rules! name!`)
Auto merge of #86246 - FabianWolff:issue-83471, r=estebank
Add basic checks for well-formedness of `fn`/`fn_mut` lang items
This pull request fixes #83471. Lang items are never actually checked for well-formedness (#9307). This means that one can get an ICE quite easily, e.g. as follows:
```rust
#![feature(lang_items)]
#[lang = "fn"]
trait MyFn {
const call: i32 = 42;
}
fn main() {
(|| 42)();
}
```
Ideally, there should probably be a more comprehensive strategy for checking lang items for well-formedness, but for the time being, I have added some rudimentary well-formedness checks that prevent #83471 and similar issues.
Rollup merge of #89208 - wesleywiser:rfc_2229_droporder, r=nikomatsakis
[rfc 2229] Drop fully captured upvars in the same order as the regular drop code
Currently, with the new 2021 edition, if a closure captures all of the
fields of an upvar, we'll drop those fields in the order they are used
within the closure instead of the normal drop order (the definition
order of the fields in the type).
This changes that so we sort the captured fields by the definition order
which causes them to drop in that same order as well.
Rollup merge of #89001 - jackh726:binder-cleanup, r=nikomatsakis
Be explicit about using Binder::dummy
This is somewhat of a late followup to the binder refactor PR. It removes `ToPredicate` and `ToPolyTraitImpls` that hide the use of `Binder::dummy`. While this does make code a bit more verbose, it allows us be more careful about where we create binders.
Another alternative here might be to add a new trait `ToBinder` or something with a `dummy()` fn. Which could still allow grepping but allows doing something like `trait_ref.dummy()` (but I also wonder if longer-term, it would be better to be even more explicit with a `bind_with_vars(ty::List::empty())` *but* that's not clear yet.
Rollup merge of #89001 - jackh726:binder-cleanup, r=nikomatsakis
Be explicit about using Binder::dummy
This is somewhat of a late followup to the binder refactor PR. It removes `ToPredicate` and `ToPolyTraitImpls` that hide the use of `Binder::dummy`. While this does make code a bit more verbose, it allows us be more careful about where we create binders.
Another alternative here might be to add a new trait `ToBinder` or something with a `dummy()` fn. Which could still allow grepping but allows doing something like `trait_ref.dummy()` (but I also wonder if longer-term, it would be better to be even more explicit with a `bind_with_vars(ty::List::empty())` *but* that's not clear yet.
Rollup merge of #88893 - Mark-Simulacrum:relnotes, r=pietroalbini
Add 1.56.0 release notes
Notable things:
* Rustdoc section currently absent, for lack of things to call out that I could find. It seems like https://github.com/rust-lang/rust/pull/87451 is the only potential candidate, but that seems like more of a bugfix and doesn't seem to warrant inclusion to me. But we can add it if desired.
As with the 1.55.0 release notes, my intent is to leave this open for approximately 1-2 weeks at the early part of the cycle, and then merge it in (after fixing any feedback). Further iteration can happen in subsequent issues (and PRs).
resolve: Refactor obtaining `Module` from its `DefId`
The `Option<Module>` version is supported for the case where we don't know whether the `DefId` refers to a module or not.
Non-local traits and enums are also correctly found now.
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