gdb脚本

一、简介

作为UNIX/linux下使用广泛的调试器，gdb不仅提供了丰富的命令，还引入了对脚本的支持：一种是对已存在的脚本语言支持，比如python，用户可以直接书写python脚本，由gdb调用python解释器执行；另一种是命令脚本（command file），用户可以在脚本中书写gdb已经提供的或者自定义的gdb命令，再由gdb执行。

二、命令脚本

自定义命令格式如下

define commandName      statement      ......  end

自定义命令帮助文档格式如下

document commandName     statement     .......end

提示：在gdb中执行脚本要使用source命令，例如：“source xxx.gdb”。

三、python脚本

脚本示例：

1 #!/usr/bin/env python  2 from __future__ import with_statement                                                                                      3 import gdb  4   5 class SaveBreakpointsCommand (gdb.Command):  6     """Save the current breakpoints to a file.  7 This command takes a single argument, a file name.  8 The breakpoints can be restored using the 'source' command."""  9  10     def __init__ (self): 11         super (SaveBreakpointsCommand, self).__init__ ("save breakpoints", 12                                                        gdb.COMMAND_SUPPORT, 13                                                        gdb.COMPLETE_FILENAME) 14  15     def invoke (self, arg, from_tty): 16         with open (arg, 'w') as f: 17             for bp in gdb.get_breakpoints (): 18                 PRint >> f, "break", bp.get_location (), 19                 if bp.get_thread () is not None: 20                     print >> f, " thread", bp.get_thread (), 21                 if bp.get_condition () is not None: 22                     print >> f, " if", bp.get_condition (), 23                 print >> f 24                 if not bp.is_enabled (): 25                     print >> f, "disable $bpnum" 26                 # Note: we don't save the ignore count; there doesn't 27                 # seem to be much point. 28                 commands = bp.get_commands () 29                 if commands is not None: 30                     print >> f, "commands" 31                     # Note that COMMANDS has a trailing newline. 32                     print >> f, commands, 33                     print >> f, "end" 34 35 SaveBreakpointsCommand ()

运行：

四、脚本加载方式

gdb加载脚本的方式有

autoload方式            #需要把 脚本放置到/usr/share/gdb/auto-load/usr/lib/目录下gdb -x script方式gdb命令source script方式