teemperor added a comment. Note that there are two parent revisions. One is just refactoring because I needed to reuse some of the parsing setup code. The other patch (the AsyncPrint one) fixes a deadlock that affected this patch. The deadlock can be reproduces by starting lldb, going to a random breakpoint in a C++ program and then trying to complete a simple expression like `expr some_local_var`. lldb will fail to read some Objective C class information from the executable and attempts to print a warning, but this deadlocks everything as we hold the IO locks while completing arguments.
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