Fix Rust panics in exception::catch, and make it safe
#669
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I tested x86 macOS, Rust panics are turned into aborts (probably because in the search phase, it tries to unwind through a frame that doesn't have CFI information). So that's fine! |
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The behaviour of foreign exceptions unwinding into Rust is defined since rust-lang/rust#128321 (see also the yet unmerged reference PR: rust-lang/reference#1226).
My understanding of how the Objective-C runtime deals with exceptions leads me to believe that the reverse is also defined, i.e. that Rust exceptions unwinding into Objective-C is sound. The big hint is that Objective-C literally has a language primitive for catching foreign exceptions,
@catch(...).I am yet unsure about x86 macOS (old Objective-C runtime), I think they use longjumps and whatnot, will have to test that.