unix: Don't override existing SIGSEGV/BUS handlers
Although `stack_overflow::init` runs very early in the process, even
before `main`, there may already be signal handlers installed for things
like the address sanitizer. In that case, just leave it alone, and don't
bother trying to allocate our own signal stacks either.
Fixes#69524.
Permit attributes on 'if' expressions
Previously, attributes on 'if' expressions (e.g. `#[attr] if true {}`)
were disallowed during parsing. This made it impossible for macros to
perform any custom handling of such attributes (e.g. stripping them
away), since a compilation error would be emitted before they ever had a
chance to run.
This PR permits attributes on 'if' expressions ('if-attrs' from here on).
Both built-in attributes (e.g. `#[allow]`, `#[cfg]`) and proc-macro attributes are supported.
We still do *not* accept attributes on 'other parts' of an if-else
chain. That is, the following code snippet still fails to parse:
```rust
if true {} #[attr] else if false {} else #[attr] if false {} #[attr]
else {}
```
Closes https://github.com/rust-lang/rust/issues/68618
Although `stack_overflow::init` runs very early in the process, even
before `main`, there may already be signal handlers installed for things
like the address sanitizer. In that case, just leave it alone, and don't
bother trying to allocate our own signal stacks either.
Compile address sanitizer test with debuginfo
This makes error-pattern to match regardless of current
configuration of `rust.debuginfo-level-tests` in `config.toml`.
Change DIBuilderCreateEnumerator signature to match LLVM 9
* Change DIBuilderCreateEnumerator signature to match LLVM 9 C API.
* Use provided is unsigned flag when emitting enumerators.
mir-interpret: add method to read wide strings from Memory
Implemented *step2* from [instructions](https://github.com/rust-lang/miri/issues/707#issuecomment-561564057) laid out in rust-lang/miri#707.
Added 2 new methods to struct `rustc_mir::interpret::InterpCx`.
* `read_os_str_from_wide_str` (src/librustc_mir/interpret/operand.rs)
* `write_os_str_to_wide_str` (src/librustc_mir/interpret/place.rs)
- used existing logic implemented in [MIRI/src/eval.rs](94732aaf7b/src/eval.rs (L132-L141))
These methods are intended to be used for environment variable emulation in Windows.
Rollup of 7 pull requests
Successful merges:
- #69631 (remove non-sysroot sources from rust-src component)
- #69646 (Miri visitor: detect primitive types based on type, not layout (also, more tests))
- #69651 (Try to ensure usize marker does not get merged)
- #69668 (More documentation and simplification of BTreeMap's internals)
- #69771 (Cleanup E0390 explanation)
- #69777 (Add missing ` in doc for File::with_options())
- #69812 (Refactorings to method/probe.rs and CrateId)
Failed merges:
r? @ghost
More documentation and simplification of BTreeMap's internals
Salvage the documentation and simplification from #67980, without changing the type locked down by debuginfo.
r? @rkruppe
Miri visitor: detect primitive types based on type, not layout (also, more tests)
I also converted the union-based transmutes to use `mem::transmute` for increased readability.
r? @eddyb @oli-obk
