LLDB 调试工具介绍

$ lldb --help
OVERVIEW: LLDB

USAGE: lldb [options]

ATTACHING:
  --attach-name <name> Tells the debugger to attach to a process with the given name.
  --attach-pid <pid>   Tells the debugger to attach to a process with the given pid.
  -n <value>           Alias for --attach-name
  -p <value>           Alias for --attach-pid
  --wait-for           Tells the debugger to wait for a process with the given pid or name to launch before attaching.
  -w                   Alias for --wait-for

COMMANDS:
  --batch              Tells the debugger to run the commands from -s, -S, -o & -O, and then quit.
  -b                   Alias for --batch
  -K <value>           Alias for --source-on-crash
  -k <value>           Alias for --one-line-on-crash
  --local-lldbinit     Allow the debugger to parse the .lldbinit files in the current working directory, unless --no-lldbinit is passed.
  --no-lldbinit        Do not automatically parse any '.lldbinit' files.
  --one-line-before-file <command>
                       Tells the debugger to execute this one-line lldb command before any file provided on the command line has been loaded.
  --one-line-on-crash <command>
                       When in batch mode, tells the debugger to run this one-line lldb command if the target crashes.
  --one-line <command> Tells the debugger to execute this one-line lldb command after any file provided on the command line has been loaded.
  -O <value>           Alias for --one-line-before-file
  -o <value>           Alias for --one-line
  -Q                   Alias for --source-quietly
  --source-before-file <file>
                       Tells the debugger to read in and execute the lldb commands in the given file, before any file has been loaded.
  --source-on-crash <file>
                       When in batch mode, tells the debugger to source this file of lldb commands if the target crashes.
  --source-quietly     Tells the debugger not to echo commands while sourcing files or one-line commands provided on the command line.
  --source <file>      Tells the debugger to read in and execute the lldb commands in the given file, after any file has been loaded.
  -S <value>           Alias for --source-before-file
  -s <value>           Alias for --source
  -x                   Alias for --no-lldbinit

OPTIONS:
  --arch <architecture> Tells the debugger to use the specified architecture when starting and running the program.
  -a <value>            Alias for --arch
  --core <filename>     Tells the debugger to use the full path to <filename> as the core file.
  -c <value>            Alias for --core
  --debug               Tells the debugger to print out extra information for debugging itself.
  -d                    Alias for --debug
  --editor              Tells the debugger to open source files using the host's "external editor" mechanism.
  -e                    Alias for --editor
  --file <filename>     Tells the debugger to use the file <filename> as the program to be debugged.
  -f <value>            Alias for --file
  --help                Prints out the usage information for the LLDB debugger.
  -h                    Alias for --help
  --no-use-colors       Do not use colors.
  --version             Prints out the current version number of the LLDB debugger.
  -v                    Alias for --version
  -X                    Alias for --no-use-color

REPL:
  -r=<flags>     Alias for --repl=<flags>
  --repl-language <language>
                 Chooses the language for the REPL.
  --repl=<flags> Runs lldb in REPL mode with a stub process with the given flags.
  --repl         Runs lldb in REPL mode with a stub process.
  -R <value>     Alias for --repl-language
  -r             Alias for --repl

SCRIPTING:
  -l <value>    Alias for --script-language
  --print-script-interpreter-info
                Prints out a json dictionary with information about the scripting language interpreter.
  --python-path Prints out the path to the lldb.py file for this version of lldb.
  -P            Alias for --python-path
  --script-language <language>
                Tells the debugger to use the specified scripting language for user-defined scripts.

EXAMPLES:
  The debugger can be started in several modes.

  Passing an executable as a positional argument prepares lldb to debug the
  given executable. To disambiguate between arguments passed to lldb and
  arguments passed to the debugged executable, arguments starting with a - must
  be passed after --.

    lldb --arch x86_64 /path/to/program program argument -- --arch armv7

  For convenience, passing the executable after -- is also supported.

    lldb --arch x86_64 -- /path/to/program program argument --arch armv7

  Passing one of the attach options causes lldb to immediately attach to the
  given process.

    lldb -p <pid>
    lldb -n <process-name>

  Passing --repl starts lldb in REPL mode.

    lldb -r

  Passing --core causes lldb to debug the core file.

    lldb -c /path/to/core

  Command options can be combined with these modes and cause lldb to run the
  specified commands before or after events, like loading the file or crashing,
  in the order provided on the command line.

    lldb -O 'settings set stop-disassembly-count 20' -o 'run' -o 'bt'
    lldb -S /source/before/file -s /source/after/file
    lldb -K /source/before/crash -k /source/after/crash

  Note: In REPL mode no file is loaded, so commands specified to run after
  loading the file (via -o or -s) will be ignored.

$ root@ubuntu:~# lldb
(lldb) help
Debugger commands:
  apropos           -- List debugger commands related to a word or subject.
  breakpoint        -- Commands for operating on breakpoints (see 'help b' for
                       shorthand.)
  command           -- Commands for managing custom LLDB commands.
  diagnostics       -- Commands controlling LLDB diagnostics.
  disassemble       -- Disassemble specified instructions in the current
                       target.  Defaults to the current function for the
                       current thread and stack frame.
  dwim-print        -- Print a variable or expression.
  expression        -- Evaluate an expression on the current thread.  Displays
                       any returned value with LLDB's default formatting.
  frame             -- Commands for selecting and examing the current thread's
                       stack frames.
  gdb-remote        -- Connect to a process via remote GDB server.
                       If no host is specifed, localhost is assumed.
                       gdb-remote is an abbreviation for 'process connect
                       --plugin gdb-remote connect://<hostname>:<port>'
  gui               -- Switch into the curses based GUI mode.
  help              -- Show a list of all debugger commands, or give details
                       about a specific command.
  kdp-remote        -- Connect to a process via remote KDP server.
                       If no UDP port is specified, port 41139 is
                       assumed.
                       kdp-remote is an abbreviation for 'process connect
                       --plugin kdp-remote udp://<hostname>:<port>'
  language          -- Commands specific to a source language.
  log               -- Commands controlling LLDB internal logging.
  memory            -- Commands for operating on memory in the current target
                       process.
  platform          -- Commands to manage and create platforms.
  plugin            -- Commands for managing LLDB plugins.
  process           -- Commands for interacting with processes on the current
                       platform.
  quit              -- Quit the LLDB debugger.
  register          -- Commands to access registers for the current thread and
                       stack frame.
  script            -- Invoke the script interpreter with provided code and
                       display any results.  Start the interactive interpreter
                       if no code is supplied.
  session           -- Commands controlling LLDB session.
  settings          -- Commands for managing LLDB settings.
  source            -- Commands for examining source code described by debug
                       information for the current target process.
  statistics        -- Print statistics about a debugging session
  target            -- Commands for operating on debugger targets.
  thread            -- Commands for operating on one or more threads in the
                       current process.
  trace             -- Commands for loading and using processor trace
                       information.
  type              -- Commands for operating on the type system.
  version           -- Show the LLDB debugger version.
  watchpoint        -- Commands for operating on watchpoints.
Current command abbreviations (type 'help command alias' for more info):
  add-dsym  -- Add a debug symbol file to one of the target's current modules
               by specifying a path to a debug symbols file or by using the
               options to specify a module.
  attach    -- Attach to process by ID or name.
  b         -- Set a breakpoint using one of several shorthand formats.
  bt        -- Show the current thread's call stack.  Any numeric argument
               displays at most that many frames.  The argument 'all' displays
               all threads.  Use 'settings set frame-format' to customize the
               printing of individual frames and 'settings set thread-format'
               to customize the thread header.
  c         -- Continue execution of all threads in the current process.
  call      -- Evaluate an expression on the current thread.  Displays any
               returned value with LLDB's default formatting.
  continue  -- Continue execution of all threads in the current process.
  detach    -- Detach from the current target process.
  di        -- Disassemble specified instructions in the current target.
               Defaults to the current function for the current thread and
               stack frame.
  dis       -- Disassemble specified instructions in the current target.
               Defaults to the current function for the current thread and
               stack frame.
  display   -- Evaluate an expression at every stop (see 'help target
               stop-hook'.)
  down      -- Select a newer stack frame.  Defaults to moving one frame, a
               numeric argument can specify an arbitrary number.
  env       -- Shorthand for viewing and setting environment variables.
  exit      -- Quit the LLDB debugger.
  f         -- Select the current stack frame by index from within the current
               thread (see 'thread backtrace'.)
  file      -- Create a target using the argument as the main executable.
  finish    -- Finish executing the current stack frame and stop after
               returning.  Defaults to current thread unless specified.
  h         -- Show a list of all debugger commands, or give details about a
               specific command.
  history   -- Dump the history of commands in this session.
               Commands in the history list can be run again using "!<INDEX>".
               "!-<OFFSET>" will re-run the command that is <OFFSET> commands
               from the end of the list (counting the current command).
  image     -- Commands for accessing information for one or more target
               modules.
  j         -- Set the program counter to a new address.
  jump      -- Set the program counter to a new address.
  kill      -- Terminate the current target process.
  l         -- List relevant source code using one of several shorthand formats.
  list      -- List relevant source code using one of several shorthand formats.
  n         -- Source level single step, stepping over calls.  Defaults to
               current thread unless specified.
  next      -- Source level single step, stepping over calls.  Defaults to
               current thread unless specified.
  nexti     -- Instruction level single step, stepping over calls.  Defaults to
               current thread unless specified.
  ni        -- Instruction level single step, stepping over calls.  Defaults to
               current thread unless specified.
  p         -- Print a variable or expression.
  parray    -- parray <COUNT> <EXPRESSION> -- lldb will evaluate EXPRESSION to
               get a typed-pointer-to-an-array in memory, and will display
               COUNT elements of that type from the array.
  po        -- Evaluate an expression on the current thread.  Displays any
               returned value with formatting controlled by the type's author.
  poarray   -- poarray <COUNT> <EXPRESSION> -- lldb will evaluate EXPRESSION to
               get the address of an array of COUNT objects in memory, and will
               call po on them.
  print     -- Print a variable or expression.
  q         -- Quit the LLDB debugger.
  r         -- Launch the executable in the debugger.
  rbreak    -- Sets a breakpoint or set of breakpoints in the executable.
  re        -- Commands to access registers for the current thread and stack
               frame.
  run       -- Launch the executable in the debugger.
  s         -- Source level single step, stepping into calls.  Defaults to
               current thread unless specified.
  shell     -- Run a shell command on the host.
  si        -- Instruction level single step, stepping into calls.  Defaults to
               current thread unless specified.
  sif       -- Step through the current block, stopping if you step directly
               into a function whose name matches the TargetFunctionName.
  step      -- Source level single step, stepping into calls.  Defaults to
               current thread unless specified.
  stepi     -- Instruction level single step, stepping into calls.  Defaults to
               current thread unless specified.
  t         -- Change the currently selected thread.
  tbreak    -- Set a one-shot breakpoint using one of several shorthand formats.
  undisplay -- Stop displaying expression at every stop (specified by stop-hook
               index.)
  up        -- Select an older stack frame.  Defaults to moving one frame, a
               numeric argument can specify an arbitrary number.
  v         -- Show variables for the current stack frame. Defaults to all
               arguments and local variables in scope. Names of argument,
               local, file static and file global variables can be specified.
  var       -- Show variables for the current stack frame. Defaults to all
               arguments and local variables in scope. Names of argument,
               local, file static and file global variables can be specified.
  vo        -- Show variables for the current stack frame. Defaults to all
               arguments and local variables in scope. Names of argument,
               local, file static and file global variables can be specified.
  x         -- Read from the memory of the current target process.
For more information on any command, type 'help <command-name>'.
(lldb) help memory
Commands for operating on memory in the current target process.

Syntax: memory <subcommand> [<subcommand-options>]

The following subcommands are supported:

      find    -- Find a value in the memory of the current target process.
      history -- Print recorded stack traces for allocation/deallocation events
                 associated with an address.
      read    -- Read from the memory of the current target process.
      region  -- Get information on the memory region containing an address in
                 the current target process.
      tag     -- Commands for manipulating memory tags
      write   -- Write to the memory of the current target process.

For more help on any particular subcommand, type 'help <command> <subcommand>'.