Hi lldb-dev,
I have a question regarding debugging a core file. With gdb, one can specify -c <core_file> to debug a core file. However, I can find no documentation to do this with lldb. Is there such a way? lldb seems to think the core file is an executable, which isn’t necessarily what I would like. Any suggestions?
THanks,
Sara
target create -c
(lldb) apropos core
The following commands may relate to 'core':
target create -- Create a target using the argument as the main executable.
(lldb) help target create
Create a target using the argument as the main executable.
Syntax: target create <cmd-options> <filename>
Command Options Usage:
target create [-a <arch>] [-p <platform-name>] [-v <none>] [-b <none>] [-s <filename>] [-c <path>] <filename>
-a <arch> ( --arch <arch> )
Specify the architecture for the target.
-b ( --build )
Specify the initial SDK build number.
-c <path> ( --core <path> )
Fullpath to a core file to use for this target.
-p <platform-name> ( --platform <platform-name> )
Specify name of the platform to use for this target, creating the platform if necessary.
-s <filename> ( --sysroot <filename> )
Specify the SDK root directory that contains a root of all remote system files.
-v ( --version )
Specify the initial SDK version to use prior to connecting.
This command takes options and arguments, if your arguments look like option specifiers you must use '--' to terminate the options before starting to give the arguments.
So there is documentation.
(lldb) target create --core /cores/core.1235
You can optionally give us the architecture and/or executable file if you know them:
(lldb) target create --core /cores/core.1235 --arch x86_64 /path/to/executable
After this commend, you can then do a:
(lldb) thread list
(lldb) thread backtrace all
Core files only work for mach-o core files right now. ELF support hasn't been done yet, but there is good sample code to follow in the following directory:
lldb/source/Plugins/Process/mach-core
Great, thanks Greg. I must not have the most up-to-date lldb version, for I see the following when I do the same commands:
(lldb) version
LLDB-112.2
(lldb) apropos core
No commands found pertaining to ‘core’. Try ‘help’ to see a complete list of debugger commands.
(lldb) help target create
Create a target using the argument as the main executable.
Syntax: target create
Command Options Usage:
target create [-a ] [-p ] [-v ] [-b ] [-s ]
-a ( --arch )
Specify the architecture for the target.
-b ( --build )
Specify the initial SDK build number.
-p ( --platform )
Specify name of the platform to use for this target, creating the platform if necessary.
-s ( --sysroot )
Specify the SDK root directory that contains a root of all remote system files.
-v ( --version )
Specify the initial SDK version to use prior to connecting.
(lldb) target create --core /cores/core.1235
lldb: unrecognized option `–core’
error: unknown or ambiguous option
Could you tell me what vernon of lldb the core support is in? Thanks!
Ah, I see, I was using Xcode 4.3.3 but Xcode 4.5.1 does have the lldb version with core support document. Thanks for your help!
Hey Sara,
I installed latest Xcode and switched to latest lldb. Its working for me.
Thanks again!
-Prabhat