Add new "target module replace" command #148735
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Summary: For dump debugging (both minidump and coredump), the dump most likely only contains the process memory without real modules so placeholder object files are created for the modules. LLDB lacks a feature to hydrate/upgrade these dummy modules into real modules. This diff bridges the gap with a new `target module replace` command. The new command would replace the place holder object file in target module with input new/real object file and refresh the symbol table/stack. The target module is located with file name matching, users can also specify the target module via "-s" option if the module names differ. Another change is placeholder modules will have `(*)` added at the end as hint. The workflow would be: * lldb -c <path_to_dump> * `image list` to see place holder modules * download fbpkg and unzip it * `target module replace <downloaded_fbpkg_module>` Test Plan: A new unit test is added. c4crasher end-to-end debugging is tested. c4crasher testing workflow is documented here: https://www.internalfb.com/intern/wiki/Coredumper/Developer_Guide/Development_Process/ Reviewers: wanyi, #lldb_team Reviewed By: wanyi Subscribers: gclayton, #lldb_team Differential Revision: https://phabricator.intern.facebook.com/D43756670
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Summary:
For dump debugging (both minidump and coredump), the dump most likely only contains the process memory without real modules so placeholder object files are created for the modules.
LLDB lacks a feature to hydrate/upgrade these dummy modules into real modules. This diff bridges the gap with a new
target module replacecommand.The new command would replace the place holder object file in target module with input new/real object file and refresh the symbol table/stack. The target module is located with file name matching, users can also specify the target module via "-s" option if the module names differ.
Another change is placeholder modules will have
(*)added at the end as hint.The workflow would be:
image listto see place holder modulestarget module replace <downloaded_fbpkg_module>Test Plan:
A new unit test is added.
c4crasher end-to-end debugging is tested.
c4crasher testing workflow is documented here: https://www.internalfb.com/intern/wiki/Coredumper/Developer_Guide/Development_Process/
Reviewers: wanyi, #lldb_team
Reviewed By: wanyi
Subscribers: gclayton, #lldb_team
Differential Revision: https://phabricator.intern.facebook.com/D43756670