[lldb] Revive shell test after updating UnwindTable (#86770) #8489
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In
commit 2f63718
Author: Jason Molenda <[email protected]>
Date: Tue Mar 26 09:07:15 2024 -0700
[lldb] Don't clear a Module's UnwindTable when adding a SymbolFile
(llvm#86603)
I stopped clearing a Module's UnwindTable when we add a SymbolFile to
avoid the memory management problems with adding a symbol file
asynchronously while the UnwindTable is being accessed on another
thread. This broke the target-symbols-add-unwind.test shell test on
Linux which removes the DWARF debub_frame section from a binary, loads
it, then loads the unstripped binary with the DWARF debug_frame section
and checks that the UnwindPlans for a function include debug_frame.
I originally decided that I was willing to sacrifice the possiblity of
additional unwind sources from a symbol file because we rely on assembly
emulation so heavily, they're rarely critical. But there are targets
where we we don't have emluation and rely on things like DWARF
debug_frame a lot more, so this probably wasn't a good choice.
This patch adds a new UnwindTable::Update method which looks for any new
sources of unwind information and adds it to the UnwindTable, and calls
that after a new SymbolFile has been added to a Module.
(cherry picked from commit 6a0ec8e)
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In
commit 2f63718
Author: Jason Molenda [email protected]
Date: Tue Mar 26 09:07:15 2024 -0700
[lldb] Don't clear a Module's UnwindTable when adding a SymbolFile (llvm#86603)
I stopped clearing a Module's UnwindTable when we add a SymbolFile to avoid the memory management problems with adding a symbol file asynchronously while the UnwindTable is being accessed on another thread. This broke the target-symbols-add-unwind.test shell test on Linux which removes the DWARF debub_frame section from a binary, loads it, then loads the unstripped binary with the DWARF debug_frame section and checks that the UnwindPlans for a function include debug_frame.
I originally decided that I was willing to sacrifice the possiblity of additional unwind sources from a symbol file because we rely on assembly emulation so heavily, they're rarely critical. But there are targets where we we don't have emluation and rely on things like DWARF debug_frame a lot more, so this probably wasn't a good choice.
This patch adds a new UnwindTable::Update method which looks for any new sources of unwind information and adds it to the UnwindTable, and calls that after a new SymbolFile has been added to a Module.
(cherry picked from commit 6a0ec8e)