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| author | bors <bors@rust-lang.org> | 2020-08-08 00:00:52 +0000 |
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| committer | bors <bors@rust-lang.org> | 2020-08-08 00:00:52 +0000 |
| commit | f3a9de9b08659e20ce7c282ed77bc43ddd149107 (patch) | |
| tree | 09288128bb819336b9043105d0df45660071ebb5 /src/rustllvm/CoverageMappingWrapper.cpp | |
| parent | c2d1b0d9800d922b0451921d2ce17e6ae665d5b4 (diff) | |
| parent | 5792840bf52e4cf77ebb7b3bd93e9c90dd23f4e7 (diff) | |
| download | rust-f3a9de9b08659e20ce7c282ed77bc43ddd149107.tar.gz rust-f3a9de9b08659e20ce7c282ed77bc43ddd149107.zip | |
Auto merge of #75048 - eggyal:force-no-tco-start-backtrace-frame, r=Mark-Simulacrum
Prevent `__rust_begin_short_backtrace` frames from being tail-call optimised away I've stumbled across some situations where there (unexpectedly) was no `__rust_begin_short_backtrace` frame on the stack during unwinding. On closer examination, it appeared that the calls to that function had been tail-call optimised away. This PR follows [@bjorn3's suggestion on Zulip](https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/Disabling.20tail.20call.20optimisation.3F/near/205699133), by adding calls to `black_box` that hint to rustc not to perform TCO. Fixes #47429
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