The compiler currently has `-Ztime` and `-Ztime-passes`. I've used
`-Ztime-passes` for years but only recently learned about `-Ztime`.
What's the difference? Let's look at the `-Zhelp` output:
```
-Z time=val -- measure time of rustc processes (default: no)
-Z time-passes=val -- measure time of each rustc pass (default: no)
```
The `-Ztime-passes` description is clear, but the `-Ztime` one is less so.
Sounds like it measures the time for the entire process?
No. The real difference is that `-Ztime-passes` prints out info about passes,
and `-Ztime` does the same, but only for a subset of those passes. More
specifically, there is a distinction in the profiling code between a "verbose
generic activity" and an "extra verbose generic activity". `-Ztime-passes`
prints both kinds, while `-Ztime` only prints the first one. (It took me
a close reading of the source code to determine this difference.)
In practice this distinction has low value. Perhaps in the past the "extra
verbose" output was more voluminous, but now that we only print stats for a
pass if it exceeds 5ms or alters the RSS, `-Ztime-passes` is less spammy. Also,
a lot of the "extra verbose" cases are for individual lint passes, and you need
to also use `-Zno-interleave-lints` to see those anyway.
Therefore, this commit removes `-Ztime` and the associated machinery. One thing
to note is that the existing "extra verbose" activities all have an extra
string argument, so the commit adds the ability to accept an extra argument to
the "verbose" activities.
Fix unwind drop glue for if-then scopes
cc `@est31`
Fix#102317Fix#99852
This PR fixes the drop glue for unwinding from a panic originated in a drop while breaking out for the else block in an `if-then` scope.
MIR validation does not fail for the synchronous versions of the test program, because `StorageDead` statements are skipped over in the unwinding process. It is only becoming a problem when it is inside a generator where `StorageDead` must be kept around.
Suggest `.into()` when all other coercion suggestions fail
Also removes some bogus suggestions because we now short-circuit when offering coercion suggestions(instead of, for example, suggesting every one that could possibly apply)
Fixes#102415
Only export `__tls_*` on wasm32-unknown-unknown.
From talking with `@abrown,` we aren't planning to have hosts call these `__tls_*` functions; instead, TLS initialization will be handled transparently within libc. Consequently, these functions don't need to be exported.
Leave them exported on wasm32-unknown-unknown though, as wasm-bindgen does call them.
panic-on-uninit: adjust checks to 0x01-filling
Now that `mem::uninitiailized` actually fills memory with `0x01` (https://github.com/rust-lang/rust/pull/99182), we can make it panic in a few less cases without risking a lot more UB -- which hopefully slightly improves compatibility with some old code, and which might increase the chance that we can check inside arrays in the future.
We detect almost all of these with our lint, so authors of such code should still be warned -- but if this happens deep inside a dependency, the panic can be quite interruptive, so it might be better not to do it when there is no risk of LLVM UB. Therefore, adjust the `might_permit_raw_init` logic to care primarily about LLVM UB. To my knowledge, it actually covers all cases of LLVM UB now.
Fixes https://github.com/rust-lang/rust/issues/66151
Cc ``@5225225``
resolve error when attempting to link a universal library on macOS
Previously attempting to link universal libraries into libraries (but not binaries) would produce an error that "File too small to be an archive". This works around this by invoking `lipo -thin` to extract a library for the target platform when passed a univeral library.
Fixes#55235
It's worth acknowledging that this implementation is kind of a horrible hack. Unfortunately I don't know how to do anything better, hopefully this PR will be a jumping off point.
Slightly improve no return for returning function error
Fixes#100607
The rationale is that absolute beginners will be slightly confused as to why certain lines of code in a function does not require a semicolon. (I have actually witness a beginner having this confusion). Hence, a slight rationale is added "to return this value", which signals to the user that after removing said semicolon the value is returned resolving that error.
However, if this is not desirable, I welcome any other suggestions. Thanks.
`TokenStreamBuilder` exists to concatenate multiple `TokenStream`s
together. This commit removes it, and moves the concatenation
functionality directly into `TokenStream`, via two new methods
`push_tree` and `push_stream`. This makes things both simpler and
faster.
`push_tree` is particularly important. `TokenStreamBuilder` only had a
single `push` method, which pushed a stream. But in practice most of the
time we push a single token tree rather than a stream, and `push_tree`
avoids the need to build a token stream with a single entry (which
requires two allocations, one for the `Lrc` and one for the `Vec`).
The main `push_tree` use arises from a change to one of the `ToInternal`
impls in `proc_macro_server.rs`. It now returns a `SmallVec` instead of
a `TokenStream`. This return value is then iterated over by
`concat_trees`, which does `push_tree` on each element. Furthermore, the
use of `SmallVec` avoids more allocations, because there is always only
one or two token trees.
Note: the removed `TokenStreamBuilder::push` method had some code to
deal with a quadratic blowup case from #57735. This commit removes the
code. I tried and failed to reproduce the blowup from that PR, before
and after this change. Various other changes have happened to
`TokenStreamBuilder` in the meantime, so I suspect the original problem
is no longer relevant, though I don't have proof of this. Generally
speaking, repeatedly extending a `Vec` without pre-determining its
capacity is *not* quadratic. It's also incredibly common, within rustc
and many other Rust programs, so if there were performance problems
there you'd think it would show up in other places, too.
`TokenTree::Punct` is handled outside the `match`. This commits moves it
inside the `match`, avoiding the need for the `return`s and making it
easier to read.
It's not about types or consts, but the lack of regions
pulled out of https://github.com/rust-lang/rust/pull/101900 which adds a fourth kind of non-lifetime generic parameter, and the naming of these methods would get ridiculous.
Previously attempting to link universal libraries into libraries (but not binaries) would produce an error that "File too small to be an archive". This works around this by using `object` to extract a library for the target platform when passed a univeral library.
Fixes#55235
Lint against nested opaque types that don't satisfy associated type bounds
See the test failures for examples of places where this lint would fire.
r? `@oli-obk`
Don't ICE when trying to copy unsized value in const prop
When we have a trivially false where-clause predicate like `Self: Sized` where `Self = dyn Trait`, we sometimes don't throw an error during typeck for an illegal operation such as copying an unsized type.
This, unfortunately, cannot be made into an error (at least not without some migration -- see #95611 for example), but we should at least not ICE, since this function will never actually be reachable from main, for example.
r? `@RalfJung` since I think you added these assertions? but feel free to reassign.
Fixes#102553
Move layout_of and friends from rustc_middle to rustc_ty_utils
Breaks up the very large module that is `rustc_middle::ty::layout` by fork-lifting some queries into `rustc_ty_utils::{abi, layout}`.
This does set back `rustc_ty_utils` to having untranslatable diagnostics. I'd like to leave this as a separate task.
Rollup of 7 pull requests
Successful merges:
- #102441 (Suggest unwrap_or_else when a closure is given)
- #102547 (Migrate CSS theme for search results)
- #102567 (Delay evaluating lint primary message until after it would be suppressed)
- #102624 (rustdoc: remove font family CSS on `.rustdoc-toggle summary::before`)
- #102628 (Change the parameter name of From::from to `value`)
- #102637 (Ignore fuchsia on two compiler tests)
- #102639 (Improve spans when splitting multi-char operator tokens for proc macros.)
Failed merges:
- #102496 (Suggest `.into()` when all other coercion suggestions fail)
r? `@ghost`
`@rustbot` modify labels: rollup
Improve spans when splitting multi-char operator tokens for proc macros.
When a two-char (or three-char) operator token is split into single-char operator tokens before being passed to a proc macro, the single-char tokens are given the original span of length two (or three). This PR gives them more accurate spans.
r? `@Aaron1011`
cc `@petrochenkov`
