在GDB中调试C ++代码:我策略性地设置了15个断点,但是在我遇到第2个断点之前我不希望它们中的任何一个被激活。 GDB中是否有任何run-until-breakpoint- n 命令?
我发现自己做了两件事之一:
删除所有其他断点,使#2全部存在,运行,重新添加所有断点;或
重复continue
经过所有休息,直到我看到#2的第一个休息时间。
我希望run-until 2
之类的东西会忽略除#2之外的所有其他断点,但不会删除它们。这存在吗?还有其他人有更好的方法来解决这个问题吗?
答案 0 :(得分:11)
您可以enable
和disable
断点,这些命令将接受范围。在程序执行期间的关键点使用这些带有范围的命令。
我假设当你提到断点#2 时,你指的是断点的gdb编号。这是一个简单的gdb会话示例:
(gdb) info breakpoints
Num Type Disp Enb Address What
1 breakpoint keep y 0x00001ddb in main at example.c:34
2 breakpoint keep y 0x00001e00 in main at example.c:39
3 breakpoint keep y 0x00001e15 in main at example.c:40
(gdb) disable 1-3
(gdb) enable 2
(gdb) info breakpoints
Num Type Disp Enb Address What
1 breakpoint keep n 0x00001ddb in main at example.c:34
2 breakpoint keep y 0x00001e00 in main at example.c:39
3 breakpoint keep n 0x00001e15 in main at example.c:40
(gdb)
现在只启用断点#2。运行程序,当执行在#2中断时,重新启用所有期望的断点,范围为:
(gdb) enable 1-3
(gdb) info breakpoints
Num Type Disp Enb Address What
1 breakpoint keep y 0x00001ddb in main at example.c:34
2 breakpoint keep y 0x00001e00 in main at example.c:39
3 breakpoint keep y 0x00001e15 in main at example.c:40
您还可以混合断点数和范围:
(gdb) disable 1 4 6-7
(gdb) info breakpoints
Num Type Disp Enb Address What
1 breakpoint keep n 0x00001ddb in main at example.c:34
2 breakpoint keep y 0x00001e00 in main at example.c:39
3 breakpoint keep y 0x00001e15 in main at example.c:40
4 breakpoint keep n 0x00001e4f in main at example.c:43
5 breakpoint keep y 0x00001e4f in main at example.c:44
6 breakpoint keep n 0x00001e5e in main at example.c:45
7 breakpoint keep n 0x00001e5e in main at example.c:46
答案 1 :(得分:11)
从7.0版开始,GDB支持python脚本。我编写了一个简单的脚本,它将临时禁用所有已启用的断点,但具有指定编号的断点除外,并执行GDB run
命令。
将以下代码添加到.gdbinit
文件中:
python
import gdb
class RunUntilCommand(gdb.Command):
"""Run until breakpoint and temporary disable other ones"""
def __init__ (self):
super(RunUntilCommand, self).__init__ ("run-until",
gdb.COMMAND_BREAKPOINTS)
def invoke(self, bp_num, from_tty):
try:
bp_num = int(bp_num)
except (TypeError, ValueError):
print "Enter breakpoint number as argument."
return
all_breakpoints = gdb.breakpoints() or []
breakpoints = [b for b in all_breakpoints
if b.is_valid() and b.enabled and b.number != bp_num and
b.visible == gdb.BP_BREAKPOINT]
for b in breakpoints:
b.enabled = False
gdb.execute("run")
for b in breakpoints:
b.enabled = True
RunUntilCommand()
end
答案 2 :(得分:3)
比删除所有其他断点稍微痛苦的是disable
他们。这样您就不必重新输入与断点关联的所有内容以将其恢复,只需再次按enable
编号。
答案 3 :(得分:2)
可以禁用gdb
个断点而不是删除。然后,您需要做的就是在需要时重新启用它们。