--remap-path-prefix: Fix duplicated path components in debuginfo
This PR fixes an issue with `--remap-path-prefix` where path components could appear twice in the remapped version of the path (e.g. https://github.com/rust-lang/rust/issues/78479). The underlying problem was that `--remap-path-prefix` is often used to map an absolute path to something that looks like a relative path, e.g.:
```
--remap-path-prefix=/home/calvin/.cargo/registry/src/github.com-1ecc6299db9ec823=crates.io",
```
and relative paths in debuginfo are interpreted as being relative to the compilation directory. So if Cargo invokes the compiler with `/home/calvin/.cargo/registry/src/github.com-1ecc6299db9ec823/some_crate-0.1.0/src/lib.rs` as input and `/home/calvin/.cargo/registry/src/github.com-1ecc6299db9ec823/some_crate-0.1.0` as the compiler's working directory, then debuginfo will state that the working directory was `crates.io/some_crate-0.1.0` and the file is question was `crates.io/some_crate-0.1.0/src/lib.rs`, which combined gives the path:
```
crates.io/some_crate-0.1.0/crates.io/some_crate-0.1.0/src/lib.rs
```
With this PR the compiler will detect this situation and set up debuginfo in LLVM in a way that makes it strip the duplicated path components when emitting DWARF.
The PR also extracts the logic for making remapped paths absolute into a common helper function that is now used by debuginfo too (instead of just during crate metadata generation).
Clean fix for #96223
Okay, so here we are (hopefully) 👍Closes#96223
Thanks a lot to `@jackh726` for your help and explanation 🙏
- Modified `InferCtxt::mk_trait_obligation_with_new_self_ty` to take as argument a `Binder<(TraitPredicate, Ty)>` instead of a `Binder<TraitPredicate>` and a separate `Ty` with no bound vars.
- Modified all call places to avoid calling `Binder::no_bounds_var` or `Binder::skip_binder` when it is not safe.
r? `@jackh726`
Mention traits and types involved in unstable trait upcasting
Fixes#95972 by printing the traits being upcasted and the types being coerced that cause that upcasting...
---
the poor span mentioned in the original issue has nothing to do with trait upcasting diagnostic here...
> The original example I had that made me run into this issue had an even longer expression there (multiple chained
iterator methods) which just got all highlighted as one big block saying "somewhere here trait coercion is used and it's not allowed".
I don't think I can solve that issue in general without fixing the ObligationCauseCode and span that gets passed into Coerce.
Suggest dereferencing non-lval mutable reference on assignment
1. Adds deref suggestions for LHS of assignment (or assign-binop) when it implements `DerefMut`
2. Fixes missing deref suggestions for LHS when it isn't a place expr
Fixes#46276Fixes#93980
interpret/validity: reject references to uninhabited types
According to https://doc.rust-lang.org/reference/behavior-considered-undefined.html, this is definitely UB. And we can check this without actually looking up anything in memory, we just need the reference value and its type, making this a great candidate for a validity invariant IMO and my favorite resolution of https://github.com/rust-lang/unsafe-code-guidelines/issues/77.
With this PR, Miri with `-Zmiri-check-number-validity` implements all my preferred options for what the validity invariants of our types could be. :)
CTFE has been doing recursive checking anyway, so this is backwards compatible but might change the error output. I will submit a PR with the new Miri tests soon.
r? `@oli-obk`
Add tmm_reg clobbers
This adds support for naming the 8 tile registers from intel AMX as clobbers from `asm!` invocations on x86_64 (only). It does not add the registers as input or output operands.
- Modified `InferCtxt::mk_trait_obligation_with_new_self_ty` to take as
argument a `Binder<(TraitPredicate, Ty)>` instead of a
`Binder<TraitPredicate>` and a separate `Ty` with no bound vars.
- Modified all call places to avoid calling `Binder::no_bounds_var` or
`Binder::skip_binder` when it is not safe.
Prevent unwinding when `-C panic=abort` is used regardless declared ABI
Ensures that Rust code will abort with `-C panic=abort` regardless ABI used.
```rust
extern "C-unwind" {
fn may_unwind();
}
// Will be nounwind with `-C panic=abort`, despite `C-unwind` ABI.
pub unsafe extern "C-unwind" fn rust_item_that_can_unwind() {
may_unwind();
}
```
Current behaviour is that unwind will propagate through. While the current behaviour won't cause unsoundness it is inconsistent with the text reading of [RFC2945](https://rust-lang.github.io/rfcs/2945-c-unwind-abi.html).
I tweaked `fn_can_unwind` instead of tweaking `AbortUnwindingCalls` because this approach would allow Rust (non-direct) callers to also see that this function is nounwind, so it can prevent excessive landing pads generation.
For more discussions: https://rust-lang.zulipchat.com/#narrow/stream/210922-project-ffi-unwind/topic/soundness.20in.20mixed.20panic.20mode.
cc `@alexcrichton,` `@BatmanAoD`
r? `@Amanieu`
`@rustbot` label: T-compiler T-lang F-c_unwind
Change `Successors` to `impl Iterator<Item = BasicBlock>`
This PR fixes the FIXME in `compiler\rustc_middle\src\mir\mod.rs`.
This can omit several `&`, `*` or `cloned` operations on Successros' generated elements
Add a query for checking whether a function is an intrinsic.
work towards #93145
This will reduce churn when we add more ways to declare intrinsics
r? `@scottmcm`
Sync rustc_codegen_cranelift
Since the last sync there have mostly been fixes of various sorts. I also changed cg_clif from using a custom driver to `-Zcodegen-backend` when built as separate project. When built as part of rust it was already using `-Zcodegen-backend`.
r? `@ghost`
`@rustbot` label +A-codegen +A-cranelift +T-compiler
