-
Notifications
You must be signed in to change notification settings - Fork 12.7k
New issue
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
codegen, miri: fix computing the offset of an unsized field in a packed struct #118540
Conversation
r? @TaKO8Ki (rustbot has picked a reviewer for you, use r? to override) |
Some changes occurred to the CTFE / Miri engine cc @rust-lang/miri The Miri subtree was changed cc @rust-lang/miri |
@@ -154,14 +153,6 @@ impl<'a, 'tcx, V: CodegenObject> PlaceRef<'tcx, V> { | |||
} | |||
_ if field.is_sized() => return simple(), | |||
ty::Slice(..) | ty::Str | ty::Foreign(..) => return simple(), | |||
ty::Adt(def, _) => { | |||
if def.repr().packed() { |
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
We could have tried to preserve this fast-path for some packed structs, but I don't think that's worth it.
75729bd
to
ef15a81
Compare
r? compiler |
@bors r+ rollup |
🌲 The tree is currently closed for pull requests below priority 10. This pull request will be tested once the tree is reopened. |
Rollup of 5 pull requests Successful merges: - rust-lang#118495 (Restrict what symbols can be used in `#[diagnostic::on_unimplemented]` format strings) - rust-lang#118540 (codegen, miri: fix computing the offset of an unsized field in a packed struct) - rust-lang#118551 (more targeted errors when extern types end up in places they should not) - rust-lang#118573 (rustc: Harmonize `DefKind` and `DefPathData`) - rust-lang#118586 (Improve example in `slice::windows()` doc) r? `@ghost` `@rustbot` modify labels: rollup
Rollup merge of rust-lang#118540 - RalfJung:unsized-packed-offset, r=TaKO8Ki codegen, miri: fix computing the offset of an unsized field in a packed struct `#[repr(packed)]` strikes again. Fixes rust-lang#118537 Fixes rust-lang/miri#3200 `@bjorn3` I assume cranelift needs the same fix.
@WaffleLapkin should this one also be marked as "relnotes"? |
@RalfJung I think so |
For the relnotes this should probably be grouped with #118538. One fixes the logic for computing the offset of an unsized field in a packed struct, the other fixes the logic for computing the size and alignment of an unsized packed struct. |
Pkgsrc changes: * Adapt checksums and patches. Upstream chnages: Version 1.76.0 (2024-02-08) ========================== Language -------- - [Document Rust ABI compatibility between various types] (rust-lang/rust#115476) - [Also: guarantee that char and u32 are ABI-compatible] (rust-lang/rust#118032) - [Warn against ambiguous wide pointer comparisons] (rust-lang/rust#117758) Compiler -------- - [Lint pinned `#[must_use]` pointers (in particular, `Box<T>` where `T` is `#[must_use]`) in `unused_must_use`.] (rust-lang/rust#118054) - [Soundness fix: fix computing the offset of an unsized field in a packed struct] (rust-lang/rust#118540) - [Soundness fix: fix dynamic size/align computation logic for packed types with dyn Trait tail] (rust-lang/rust#118538) - [Add `$message_type` field to distinguish json diagnostic outputs] (rust-lang/rust#115691) - [Enable Rust to use the EHCont security feature of Windows] (rust-lang/rust#118013) - [Add tier 3 {x86_64,i686}-win7-windows-msvc targets] (rust-lang/rust#118150) - [Add tier 3 aarch64-apple-watchos target] (rust-lang/rust#119074) - [Add tier 3 arm64e-apple-ios & arm64e-apple-darwin targets] (rust-lang/rust#115526) Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Add a column number to `dbg!()`] (rust-lang/rust#114962) - [Add `std::hash::{DefaultHasher, RandomState}` exports] (rust-lang/rust#115694) - [Fix rounding issue with exponents in fmt] (rust-lang/rust#116301) - [Add T: ?Sized to `RwLockReadGuard` and `RwLockWriteGuard`'s Debug impls.] (rust-lang/rust#117138) - [Windows: Allow `File::create` to work on hidden files] (rust-lang/rust#116438) Stabilized APIs --------------- - [`Arc::unwrap_or_clone`] (https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.unwrap_or_clone) - [`Rc::unwrap_or_clone`] (https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.unwrap_or_clone) - [`Result::inspect`] (https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.inspect) - [`Result::inspect_err`] (https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.inspect_err) - [`Option::inspect`] (https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.inspect) - [`type_name_of_val`] (https://doc.rust-lang.org/stable/std/any/fn.type_name_of_val.html) - [`std::hash::{DefaultHasher, RandomState}`] (https://doc.rust-lang.org/stable/std/hash/index.html#structs) These were previously available only through `std::collections::hash_map`. - [`ptr::{from_ref, from_mut}`] (https://doc.rust-lang.org/stable/std/ptr/fn.from_ref.html) - [`ptr::addr_eq`](https://doc.rust-lang.org/stable/std/ptr/fn.addr_eq.html) Cargo ----- See [Cargo release notes] (https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-176-2024-02-08). Rustdoc ------- - [Don't merge cfg and doc(cfg) attributes for re-exports] (rust-lang/rust#113091) - [rustdoc: allow resizing the sidebar / hiding the top bar] (rust-lang/rust#115660) - [rustdoc-search: add support for traits and associated types] (rust-lang/rust#116085) - [rustdoc: Add highlighting for comments in items declaration] (rust-lang/rust#117869) Compatibility Notes ------------------- - [Add allow-by-default lint for unit bindings] (rust-lang/rust#112380) This is expected to be upgraded to a warning by default in a future Rust release. Some macros emit bindings with type `()` with user-provided spans, which means that this lint will warn for user code. - [Remove x86_64-sun-solaris target.] (rust-lang/rust#118091) - [Remove asmjs-unknown-emscripten target] (rust-lang/rust#117338) - [Report errors in jobserver inherited through environment variables] (rust-lang/rust#113730) This [may warn](rust-lang/rust#120515) on benign problems too. - [Update the minimum external LLVM to 16.] (rust-lang/rust#117947) - [Improve `print_tts`](rust-lang/rust#114571) This change can break some naive manual parsing of token trees in proc macro code which expect a particular structure after `.to_string()`, rather than just arbitrary Rust code. - [Make `IMPLIED_BOUNDS_ENTAILMENT` into a hard error from a lint] (rust-lang/rust#117984) - [Vec's allocation behavior was changed when collecting some iterators] (rust-lang/rust#110353) Allocation behavior is currently not specified, nevertheless changes can be surprising. See [`impl FromIterator for Vec`] (https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#impl-FromIterator%3CT%3E-for-Vec%3CT%3E) for more details. - [Properly reject `default` on free const items] (rust-lang/rust#117818)
#[repr(packed)]
strikes again.Fixes #118537
Fixes rust-lang/miri#3200
@bjorn3 I assume cranelift needs the same fix.