Directly implement native exception raise methods in miri#3319
Directly implement native exception raise methods in miri#3319bors merged 2 commits intorust-lang:masterfrom
Conversation
|
I was confused by the context here, since it's unclear what issue you are fixing, and what "old custom ABI" is. After reading the PR code and mulling over this for a bit, I think "old custom ABI" is the |
My bad. I was indeed referring to |
tests/pass/panic/unwind_dwarf.rs
Outdated
| // M O Z \0 R U S T -- vendor, language | ||
| 0x4d4f5a_00_52555354 |
There was a problem hiding this comment.
Maybe set this to something else since we're testing the unwinder mechanism in general, not specifically Rust panics?
|
For miri_start_panic we have some interesting tests: miri_bad_start_panic, unwind_panic_abort. We probably want to have similar tests for this as well. Other than that, LGTM. |
|
@rustbot author |
rustbot
added
the
S-waiting-on-author
|
@bjorn3 what is the status of this? This seems basically done, just needs more tests. |
|
☔ The latest upstream changes (presumably #3557) made this pull request unmergeable. Please resolve the merge conflicts. |
Windows still needs the old custom ABI as SEH unwinding isn't supported by miri. Unlike DWARF unwinding it preserves all stack frames until right after the do_catch function has executed. Because of this panic_unwind stack allocates the exception object. Miri can't currently model unwinding without destroying stack frames and as such will report a use-after-free of the exception object.
- share implementation with miri_starting_unwind - make test use a custom unwinding class - extend comments - use NeedsUnwind more consistently
|
I did a bit of refactoring to finish the PR. Thanks for the initial idea! |
|
☀️ Test successful - checks-actions |
Use the native unwind function in miri where possible Continuation of rust-lang/miri#3319 cc `@RalfJung`
Rollup merge of rust-lang#127214 - bjorn3:miri_native_unwind, r=oli-obk Use the native unwind function in miri where possible Continuation of rust-lang/miri#3319 cc `@RalfJung`
Use the native unwind function in miri where possible Continuation of #3319 cc `@RalfJung`
4 participants
This implements the
_Unwind_RaiseExceptionfunction used on pretty much every unix system for starting unwinding. This allows removing the miri special case from libpanic_unwind for unix.Windows still needs
miri_start_unwindas SEH unwinding isn't supported by miri. Unlike DWARF unwinding, SEH preserves all stack frames until right after the do_catch function has executed. Because of this panic_unwind stack allocates the exception object. Miri can't currently model unwinding without destroying stack frames and as such will report a use-after-free of the exception object.