llvm-project

2684281d - Add a test for evicting unreachable modules from the global module cache (#74894)

Add a test for evicting unreachable modules from the global module cache (#74894) When you debug a binary and the change & rebuild and then rerun in lldb w/o quitting lldb, the Modules in the Global Module Cache for the old binary & .o files if used are now "unreachable". Nothing in lldb is holding them alive, and they've already been unlinked. lldb will properly discard them if there's not another Target referencing them. However, this only works in simple cases at present. If you have several Targets that reference the same modules, it's pretty easy to end up stranding Modules that are no longer reachable, and if you use a sequence of SBDebuggers unreachable modules can also get stranded. If you run a long-lived lldb process and are iteratively developing on a large code base, lldb's memory gets filled with useless Modules. This patch adds a test for the mode that currently works: (lldb) target create foo (lldb) run <rebuild foo outside lldb> (lldb) run In that case, we do delete the unreachable Modules. The next step will be to add tests for the cases where we fail to do this, then see how to safely/efficiently evict unreachable modules in those cases as well.