tree bd8f5ddca067cdb20299d725d5117246245142c7
parent 23aa8969930779ff526b76c64b083082edf1cdd1
author Fangrui Song <i@maskray.me> 1610057146 -0800
committer Copybara-Service <copybara-worker@google.com> 1610322528 -0800

[libc++abi] Simplify __gxx_personality_v0

In three cases we call `scan_eh_tab` to parse LSDA:

* `actions & _UA_SEARCH_PHASE`
* `actions & _UA_CLEANUP_PHASE && actions & _UA_HANDLER_FRAME && !native_exception`
* `actions & _UA_CLEANUP_PHASE && !(actions & _UA_HANDLER_FRAME)`

Check
`actions & _UA_CLEANUP_PHASE && actions & _UA_HANDLER_FRAME && native_exception` first,
then we can move three `scan_eh_tab` into one place.

Another simplification is that we can check whether the result of `scan_eh_tab`
is `_UA_CONTINUE_UNWIND` or `_UA_FATAL_PHASE1_ERROR` first. Then many of the
original checks will be dead and can thus be deleted.

Reviewed By: #libc_abi, ldionne

Differential Revision: https://reviews.llvm.org/D93186

GitOrigin-RevId: 85f86e8a3cf9e05347691fdde30e9e98a6657d92