LLDB调试命令

LLDB简介

LLDB 是 XCode 内置的调试工具。从 Xcode5 开始，LLDB 已经取代 GDB，成为 Xcode 默认调试器。

常用命令

1. 打印变量值：call、p、print；
2. 调用函数：call；
3. 修改变量值：expression；
4. 打印调用栈：thread backtrace；
5. 跳过当前函数：thread return；
6. 流程控制：continue、next、setp、finish；
7. 列出当前帧中的变量：frame variable；
8. 查找崩溃位置：image lookup -a；
9. 查看类的成员：image lookup –t；
10. 查看方法的来源：image lookup -n。

命令大全

(笔者当前 lldb 版本为lldb-902.0.79.7，在 lldb 中使用help命令可以获得所有调试命令)

Debugger commands:
  apropos           -- List debugger commands related to a word or subject.
  breakpoint        -- Commands for operating on breakpoints (see 'help b' for
                       shorthand.)
  bugreport         -- Commands for creating domain-specific bug reports.
  command           -- Commands for managing custom LLDB commands.
  disassemble       -- Disassemble specified instructions in the current
                       target.  Defaults to the current function for the
                       current thread and stack frame.
  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.
  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.
  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.
  settings          -- Commands for managing LLDB settings.
  source            -- Commands for examining source code described by debug
                       information for the current target process.
  target            -- Commands for operating on debugger targets.
  thread            -- Commands for operating on one or more threads in the
                       current process.
  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 using the
               options to specify a module to download symbols for.
  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.
  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.
  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         -- Evaluate an expression on the current thread.  Displays any
               returned value with LLDB's default formatting.
  parray    -- Evaluate an expression on the current thread.  Displays any
               returned value with LLDB's default formatting.
  po        -- Evaluate an expression on the current thread.  Displays any
               returned value with formatting controlled by the type's author.
  poarray   -- Evaluate an expression on the current thread.  Displays any
               returned value with LLDB's default formatting.
  print     -- Evaluate an expression on the current thread.  Displays any
               returned value with LLDB's default formatting.
  q         -- Quit the LLDB debugger.
  r         -- Launch the executable in the debugger.
  rbreak    -- Sets a breakpoint or set of breakpoints in the executable.
  repl      -- Evaluate an expression on the current thread.  Displays any
               returned value with LLDB's default formatting.
  run       -- Launch the executable in the debugger.
  s         -- Source level single step, stepping into calls.  Defaults to
               current thread unless specified.
  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.
  x         -- Read from the memory of the current target process.