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instead of a new panic
For unwinding with SEH, we currently construct a C++ exception with the
panic data. Being a regular C++ exception, it interacts with the C++
exception handling machinery and can be retrieved via
`std::current_exception`, which needs to copy the exception. We can't
support that, so we panic, which throws another exception, which the
C++ runtime tries to copy and store into the exception_ptr, which panics
again, which causes the C++ runtime to store a `bad_exception` instance.
However, this doesn't work because the panics thrown by the copy
function will be dropped without being rethrown, and causes unnecessary
log spam in stderr. Fix this by directly throwing an exception without
data, which doesn't cause log spam and can be dropped without being
rethrown.
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Currently, the code for process aborts is duplicated across `panic_abort` and `std`. This PR uses `#[rustc_std_internal_symbol]` to make the `std` implementation available to `panic_abort` via the linker, thereby deduplicating the code.
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This ensures that they will be correctly mangled in a future commit.
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Use `std::mem::{size_of, size_of_val, align_of, align_of_val}` from the
prelude instead of importing or qualifying them.
These functions were added to all preludes in Rust 1.80.
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Some miscellaneous edition-related library tweaks
Some library edition tweaks that can be done separately from upgrading the whole standard library to edition 2024 (which is blocked on getting the submodules upgraded, for example)
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Add support for wasm exception handling to Emscripten target
This is a draft because we need some additional setting for the Emscripten target to select between the old exception handling and the new exception handling. I don't know how to add a setting like that, would appreciate advice from Rust folks. We could maybe choose to use the new exception handling if `Ctarget-feature=+exception-handling` is passed? I tried this but I get errors from llvm so I'm not doing it right.
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Gated behind an unstable `-Z emscripten-wasm-eh` flag
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Switch rtems target to panic unwind
Switch the RTEMS target to `panic_unwind`.
Relates to https://github.com/rust-lang/backtrace-rs/pull/682
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Remove allowing static_mut_refs lint
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The link was introduced in 0ec321f7b541fcbfbf20286beb497e6d9d3352b2.
For the old link see https://web.archive.org/web/20170409223244/https://monoinfinito.wordpress.com/series/exception-handling-in-c/.
The blog has migrated from WordPress to Blogger in 2021 and to GitHub pages in 2024.
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This makes it appear correctly in hexdumps on both LE and BE platforms.
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Since the stabilization in #127679 has reached stage0, 1.82-beta, we can
start using `&raw` freely, and even the soft-deprecated `ptr::addr_of!`
and `ptr::addr_of_mut!` can stop allowing the unstable feature.
I intentionally did not change any documentation or tests, but the rest
of those macro uses are all now using `&raw const` or `&raw mut` in the
standard library.
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Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
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Disallow hidden references to mutable static
Closes #123060
Tracking:
- https://github.com/rust-lang/rust/issues/123758
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Bump boostrap compiler to new beta
Accidentally left some comments on the update cfgs commit directly xd
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Bump bootstrap compiler to new beta
https://forge.rust-lang.org/release/process.html#master-bootstrap-update-t-2-day-tuesday
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The previous commit updated `rustfmt.toml` appropriately. This commit is
the outcome of running `x fmt --all` with the new formatting options.
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workingjubilee:weaken-thir-unsafeck-for-addr-of-static-mut, r=compiler-errors
treat `&raw (const|mut) UNSAFE_STATIC` implied deref as safe
Fixes rust-lang/rust#125833
As reported in that and related issues, `static mut STATIC_MUT: T` is very often used in embedded code, and is in many ways equivalent to `static STATIC_CELL: SyncUnsafeCell<T>`. The Rust expression of `&raw mut STATIC_MUT` and `SyncUnsafeCell::get(&STATIC_CELL)` are approximately equal, and both evaluate to `*mut T`. The library function is safe because it has *declared itself* to be safe. However, the raw ref operator is unsafe because all uses of `static mut` are considered unsafe, even though the static's value is not used by this expression (unlike, for example, `&STATIC_MUT`).
We can fix this unnatural difference by simply adding the proper exclusion for the safety check inside the THIR unsafeck, so that we do not declare it unsafe if it is not.
While the primary concern here is `static mut`, this change is made for all instances of an "unsafe static", which includes a static declared inside `extern "abi" {}`. Hypothetically, we could go as far as generalizing this to all instances of `&raw (const|mut) *ptr`, but today we do not, as we have not actually considered the range of possible expressions that use a similar encoding. We do not even extend this to thread-local equivalents, because they have less clear semantics.
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Rollup of 7 pull requests
Successful merges:
- #126380 (Add std Xtensa targets support)
- #126636 (Resolve Clippy `f16` and `f128` `unimplemented!`/`FIXME`s )
- #126659 (More status-quo tests for the `#[coverage(..)]` attribute)
- #126711 (Make Option::as_[mut_]slice const)
- #126717 (Clean up some comments near `use` declarations)
- #126719 (Fix assertion failure for some `Expect` diagnostics.)
- #126730 (Add opaque type corner case test)
r? `@ghost`
`@rustbot` modify labels: rollup
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Most modules have such a blank line, but some don't. Inserting the blank
line makes it clearer that the `//!` comments are describing the entire
module, rather than the `use` declaration(s) that immediately follows.
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And remove the libc crate when it isn't needed
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strict-provenance
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SeqCst is unnecessary here.
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std support for wasm32 panic=unwind
Tracking issue: #118168
This adds std support for `-Cpanic=unwind` on wasm, and with it slightly more fleshed out rustc support. Now, the stable default is still panic=abort without exception-handling, but if you `-Zbuild-std` with `RUSTFLAGS=-Cpanic=unwind`, you get wasm exception-handling try/catch blocks in the binary:
```rust
#[no_mangle]
pub fn foo_bar(x: bool) -> *mut u8 {
let s = Box::<str>::from("hello");
maybe_panic(x);
Box::into_raw(s).cast()
}
#[inline(never)]
#[no_mangle]
fn maybe_panic(x: bool) {
if x {
panic!("AAAAA");
}
}
```
```wat
;; snip...
(try $label$5
(do
(call $maybe_panic
(local.get $0)
)
(br $label$1)
)
(catch_all
(global.set $__stack_pointer
(local.get $1)
)
(call $__rust_dealloc
(local.get $2)
(i32.const 5)
(i32.const 1)
)
(rethrow $label$5)
)
)
;; snip...
```
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Rename `static_mut_ref` lint to `static_mut_refs`.
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