proc_macro: don't pass a client-side function pointer through the server.
Before this PR, `proc_macro::bridge::Client<F>` contained both:
* the C ABI entry-point `run`, that the server can call to start the client
* some "payload" `f: F` passed to that entry-point
* in practice, this was always a (client-side Rust ABI) `fn` pointer to the actual function the proc macro author wrote, i.e. `#[proc_macro] fn foo(input: TokenStream) -> TokenStream`
In other words, the client was passing one of its (Rust) `fn` pointers to the server, which was passing it back to the client, for the client to call (see later below for why that was ever needed).
I was inspired by `@nnethercote's` attempt to remove the `get_handle_counters` field from `Client` (see https://github.com/rust-lang/rust/pull/97004#issuecomment-1139273301), which combined with removing the `f` ("payload") field, could theoretically allow for a `#[repr(transparent)]` `Client` that mostly just newtypes the C ABI entry-point `fn` pointer <sub>(and in the context of e.g. wasm isolation, that's *all* you want, since you can reason about it from outside the wasm VM, as just a 32-bit "function table index", that you can pass to the wasm VM to call that function)</sub>.
<hr/>
So this PR removes that "payload". But it's not a simple refactor: the reason the field existed in the first place is because monomorphizing over a function type doesn't let you call the function without having a value of that type, because function types don't implement anything like `Default`, i.e.:
```rust
extern "C" fn ffi_wrapper<A, R, F: Fn(A) -> R>(arg: A) -> R {
let f: F = ???; // no way to get a value of `F`
f(arg)
}
```
That could be solved with something like this, if it was allowed:
```rust
extern "C" fn ffi_wrapper<
A, R,
F: Fn(A) -> R,
const f: F // not allowed because the type is a generic param
>(arg: A) -> R {
f(arg)
}
```
Instead, this PR contains a workaround in `proc_macro::bridge::selfless_reify` (see its module-level comment for more details) that can provide something similar to the `ffi_wrapper` example above, but limited to `F` being `Copy` and ZST (and requiring an `F` value to prove the caller actually can create values of `F` and it's not uninhabited or some other unsound situation).
<hr/>
Hopefully this time we don't have a performance regression, and this has a chance to land.
cc `@mystor` `@bjorn3`
Try to cache region_scope_tree as a query
This PR will attempt to restore `region_scope_tree` as a query so that caching works again. It seems that `region_scope_tree` could be re-computed for nested items after all, which could explain the performance regression introduced by #95563.
cc `@Mark-Simulacrum` `@pnkfelix` I will try to trigger a perf run here.
Split dead store elimination off dest prop
This splits off a part of #96451 . I've added this in as its own pass for now, so that it actually runs, can be tested, etc. In the dest prop PR, I'll stop invoking this as its own pass, so that it doesn't get invoked twice.
r? `@tmiasko`
[bootstrap] Move `sanitize_sh` from `dist` to `install`
This is the only place it's used, so there's no need for it to be public in another module.
In general, `dist` shouldn't ever touch shell scripts.
macros: introduce `fluent_messages` macro
Adds a new `fluent_messages` macro which performs compile-time validation of the compiler's Fluent resources (i.e. that the resources parse and don't multiply define the same messages) and generates constants that make using those messages in diagnostics more ergonomic.
For example, given the following invocation of the macro..
```rust
fluent_messages! {
typeck => "./typeck.ftl",
}
```
..where `typeck.ftl` has the following contents..
```fluent
typeck-field-multiply-specified-in-initializer =
field `{$ident}` specified more than once
.label = used more than once
.label-previous-use = first use of `{$ident}`
```
...then the macro parse the Fluent resource, emitting a diagnostic if it fails to do so...
```text
error: could not parse Fluent resource
--> $DIR/test.rs:35:28
|
LL | missing_message => "./missing-message.ftl",
| ^^^^^^^^^^^^^^^^^^^^^^^
|
= help: see additional errors emitted
error: expected a message field for "missing-message"
--> ./missing-message.ftl:1:1
|
1 | missing-message =
| ^^^^^^^^^^^^^^^^^^
|
```
...or generating the following code if it succeeds:
```rust
pub static DEFAULT_LOCALE_RESOURCES: &'static [&'static str] = &[
include_str!("./typeck.ftl"),
];
mod fluent_generated {
mod typeck {
pub const field_multiply_specified_in_initializer: DiagnosticMessage =
DiagnosticMessage::fluent("typeck-field-multiply-specified-in-initializer");
pub const field_multiply_specified_in_initializer_label_previous_use: DiagnosticMessage =
DiagnosticMessage::fluent_attr(
"typeck-field-multiply-specified-in-initializer",
"previous-use-label"
);
}
}
```
When emitting a diagnostic, the generated constants can be used as follows:
```rust
let mut err = sess.struct_span_err(
span,
fluent::typeck::field_multiply_specified_in_initializer
);
err.span_label(
span,
fluent::typeck::field_multiply_specified_in_initializer_label
);
err.span_label(
previous_use_span,
fluent::typeck::field_multiply_specified_in_initializer_label_previous_use
);
err.emit();
```
I'd like to reduce the verbosity of referring to labels/notes/helps with this scheme (though it wasn't much better before), but I'll leave that for a follow-up.
r? `@oli-obk`
cc `@pvdrz` `@compiler-errors`
Partially stabilize `(const_)slice_ptr_len` feature by stabilizing `NonNull::len`
This PR partially stabilizes features `const_slice_ptr_len` and `slice_ptr_len` by only stabilizing `NonNull::len`. This partial stabilization is tracked under features `slice_ptr_len_nonnull` and `const_slice_ptr_len_nonnull`, for which this PR can serve as the tracking issue.
To summarize the discussion from #71146 leading up to this partial stabilization request:
It's currently a bit footgunny to obtain the length of a raw slice pointer, stabilization of `NonNull:len` will help with removing these footguns. Some example footguns are:
```rust
/// # Safety
/// The caller must ensure that `ptr`:
/// 1. does not point to memory that was previously allocated but is now deallocated;
/// 2. is within the bounds of a single allocated object;
/// 3. does not to point to a slice for which the length exceeds `isize::MAX` bytes;
/// 4. points to a properly aligned address;
/// 5. does not point to uninitialized memory;
/// 6. does not point to a mutably borrowed memory location.
pub unsafe fn ptr_len<T>(ptr: core::ptr::NonNull<[T]>) -> usize {
(&*ptr.as_ptr()).len()
}
```
A slightly less complicated version (but still more complicated than it needs to be):
```rust
/// # Safety
/// The caller must ensure that the start of `ptr`:
/// 1. does not point to memory that was previously allocated but is now deallocated;
/// 2. must be within the bounds of a single allocated object.
pub unsafe fn ptr_len<T>(ptr: NonNull<[T]>) -> usize {
(&*(ptr.as_ptr() as *const [()])).len()
}
```
This PR does not stabilize `<*const [T]>::len` and `<*mut [T]>::len` because the tracking issue #71146 list a potential blocker for these methods, but this blocker [does not apply](https://github.com/rust-lang/rust/issues/71146#issuecomment-808735714) to `NonNull::len`.
We should probably also ping the [Constant Evaluation WG](https://github.com/rust-lang/const-eval) since this PR includes a `#[rustc_allow_const_fn_unstable(const_slice_ptr_len)]`. My instinct here is that this will probably be okay because the pointer is not actually dereferenced and `len()` does not touch the address component of the pointer, but would be best to double check :)
One potential down-side was raised that stabilizing `NonNull::len` could lead to encouragement of coding patterns like:
```
pub fn ptr_len<T>(ptr: *mut [T]) -> usize {
NonNull::new(ptr).unwrap().len()
}
```
which unnecessarily assert non-nullness. However, these are much less of a footgun than the above examples and this should be resolved when `slice_ptr_len` fully stabilizes eventually.
Add suggestion for relaxing static lifetime bounds on dyn trait impls in NLL
This PR introduces suggestions for relaxing static lifetime bounds on impls of dyn trait items for NLL similar to what is already available in lexical region diagnostics.
Fixes https://github.com/rust-lang/rust/issues/95701
r? `@estebank`
Print stderr consistently
Solves https://github.com/rust-lang/rust/issues/96712
I tried to follow what I perceived as the general consensus for error messages in boostrap i.e messages that were ..
* resulting from an Err(...) =>
* literally called as "Error: ...."
* by the end of the block scope forced to run a panic! or process::exit with a guaranteed non-zero error code.
Remove impossible panic note from `Vec::append`
Neither the number of elements in a vector can overflow a `usize`, nor
can the amount of elements in two vectors.
Update jemalloc to v5.3
Now that `jemalloc` version 5.3 has been released, this PR updates `tikv-jemalloc-sys` to the corresponding release.
The crates.io publishing issue seems to have been resolved for the `jemalloc-sys` package, and version 5.3.0 is now also available under the historical name (and should become the preferred crate to be used). Therefore, this PR also switches back to using `jemalloc-sys` instead of `tikv-jemalloc-sys`.
It looks like the last time had left some remaining cfg's -- which made me think
that the stage0 bump was actually successful. This brings us to a released 1.62
beta though.
Move various checks to typeck so them failing causes the typeck result to get tainted
Fixes#69487fixes#79047
cc `@RalfJung` this gets rid of the `Transmute` invalid program error variant
Fix multiline attributes processing in doctest
Fixes#97440.
It seems like the call to `check_if_attr_is_complete` is not provided with the correct argument: the pending attribute should be passed, while the current line is actually being passed. This causes any attribute with more than 2 lines to fail and produces ICE when running through doctest.
