Sometimes, crash reports come with inlined symbols. These provide the
exact stacktrace from the user binary.
However, when investigating a crash, it's very likely that the images related
to the crashed thread are not available on the debugging user system or
that the versions don't match. This causes interactive crashlog to show
a degraded backtrace in lldb.
This patch aims to address that issue, by parsing the inlined symbols
from the crash report and load them into lldb's target.
This patch is a follow-up to 27f27d1, focusing on inlined symbols
loading from legacy (non-json) crash reports.
To do so, it updates the stack frame regular expression to make the
capture groups more granular, to be able to extract the symbol name, the
offset and the source location if available, while making it more
maintainable.
So now, when parsing the crash report, we build a data structure
containing all the symbol information for each stackframe. Then, after
launching the scripted process for interactive mode, we write a JSON
symbol file for each module, only containing the symbols that it contains.
Finally, we load the json symbol file into lldb, before showing the user
the process status and backtrace.
rdar://97345586
Differential Revision: https://reviews.llvm.org/D146765
Signed-off-by: Med Ismail Bennani <ismail@bennani.ma>