lldb help

可能你會忘記某些指令的用法， 使用help可以幫助你。

(lldb) breakpoint --help  
invalid command 'breakpoint --help'.
(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.
  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.
  reproducer        -- Commands for manipulating reproducers. Reproducers make it possible to
                       capture full debug sessions with all its dependencies. The resulting
                       reproducer is used to replay the debug session while debugging the
                       debugger.
                       Because reproducers need the whole the debug session from beginning to end,
                       you need to launch the debugger in capture or replay mode, commonly though
                       the command line driver.
                       Reproducers are unrelated record-replay debugging, as you cannot interact
                       with the debugger during replay.
  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.
  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.
  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.  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.
  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    -- 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     -- 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.
  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.
  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. Children of aggregate variables can be specified such as
               'var->child.x'.  The -> and [] operators in 'frame variable' do not invoke operator
               overloads if they exist, but directly access the specified element.  If you want to
               trigger operator overloads use the expression command to print the variable
               instead.
               It is worth noting that except for overloaded operators, when printing local
               variables 'expr local_var' and 'frame var local_var' produce the same results. 
               However, 'frame variable' is more efficient, since it uses debug information and
               memory reads directly, rather than parsing and evaluating an expression, which may
               even involve JITing and running code in the target program.
  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. Children of aggregate variables can be specified such as
               'var->child.x'.  The -> and [] operators in 'frame variable' do not invoke operator
               overloads if they exist, but directly access the specified element.  If you want to
               trigger operator overloads use the expression command to print the variable
               instead.
               It is worth noting that except for overloaded operators, when printing local
               variables 'expr local_var' and 'frame var local_var' produce the same results. 
               However, 'frame variable' is more efficient, since it uses debug information and
               memory reads directly, rather than parsing and evaluating an expression, which may
               even involve JITing and running code in the target program.
  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. Children of aggregate variables can be specified such as
               'var->child.x'.  The -> and [] operators in 'frame variable' do not invoke operator
               overloads if they exist, but directly access the specified element.  If you want to
               trigger operator overloads use the expression command to print the variable
               instead.
               It is worth noting that except for overloaded operators, when printing local
               variables 'expr local_var' and 'frame var local_var' produce the same results. 
               However, 'frame variable' is more efficient, since it uses debug information and
               memory reads directly, rather than parsing and evaluating an expression, which may
               even involve JITing and running code in the target program.
  x         -- Read from the memory of the current target process.

 

很親切。