Jonas Devlieghere df1c7ebac7 [lldb] Speculative fix for crash in Function::GetCallEdges() (#193636) ...

Replace the unprotected union+bool lazy resolution in DirectCallEdge
with `std::call_once`/`std::once_flag`.

Multiple threads can call `GetCallee` on the same edge concurrently and
the old code had no synchronization on the union discriminator or its
contents. This could lead to a corrupted pointer that would explain the
crash we're observing sporadically.

rdar://175006028

2026-04-23 11:26:36 -07:00

24 KiB

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