当到达断点时，gdb 不提供回溯，但它在命令文件中指定
gdb doesn't give a backtrace when a breakpoint is reached but it is specified in the commands file
我正在尝试在到达 C 代码中的一行时获取回溯。
我将命令文件提供给 gdb，它工作正常，但到达断点时没有任何反应。
我正在使用带有 gdb 版本 9.1-3 的 Debian 测试
我的代码是用 CFLAGS 编译的：
-Og -g3 -m32 -gdwarf-4 -fvar-tracking-assignments -w
gcc 版本是 (Debian 9.3.0-10) 9.3.0
使用其他版本的 dwarf 似乎没有任何区别。
我包含的命令文件是：
set confirm off
set pagination off
set logging file gdbrogue.txt
set logging overwrite on
set logging on
set breakpoint pending on
#set trace-commands on
directory /home/me/src/github/rogue-54-for-rogomatic
symbol-file -readnow /usr/local/bin/rogue
skip file hardscroll.c
skip file hashmap.c
skip file lib_addch.c
skip file lib_addstr.c
skip file lib_clreol.c
skip file lib_erase.c
skip file lib_getch.c
skip file lib_move.c
skip file lib_mvcur.c
skip file lib_refresh.c
skip file lib_touch.c
skip file lib_tparm.c
skip file lib_tputs.c
skip file lib_winch.c
skip file lib_window.c
skip file tty_update.c
skip function look
skip function msg
skip function read
skip function unctrl
skip function __kernel_vsyscall
define my_prt_mlist
set $current = mlist
while ($current > 0)
printf "curr %p prev %p next %p\n", $current, $current->l_prev, $current->l_next
printf " t_type %c\n", $current->t_type
printf " t_pos.y %d t_pos.x %d\n", $current->t_pos.y, $current->t_pos.x
if ($current->t_dest > 0)
printf " t_dest->y %d t_dest->x %d\n", $current->t_dest->y, $current->t_dest->x
end
set $current = $current->l_next
end
end
break chase.c:32 if (level == 7)
commands
printf "player(y,x) (%d,%d)\n", player.t_pos.y, player.t_pos.x
my_prt_mlist
end
break chase.c:455 if (level == 7)
commands
printf "player(y,x) (%d,%d)\n", player.t_pos.y, player.t_pos.x
my_prt_mlist
backtrace full
end
while (level < 7)
next
end
while (level == 7)
step
end
while (level > 7)
next
end
输出显示到达中断但没有回溯显示？
roomin (cp=0x582403cc) at chase.c:445
445 roomin(coord *cp) {
452 if (((cp->x > MAXCOLS) || (cp->y > MAXLINES)) ||
454 msg("in some bizarre place (%d, %d)", unc(*cp));
Breakpoint 2, roomin (cp=0x582403cc) at chase.c:455
455 return NULL;
do_chase (th=0x5823ede0) at chase.c:142
142 door = (chat(th->t_pos.y, th->t_pos.x) == DOOR);
知道我在这里做错了什么或者这是一个 gdb/gcc 错误吗？
我寻找过类似的问题和答案，但 none 似乎有这个特定问题。
谢谢！ :)
好的，经过各种试验和阅读，我终于至少得到了上述脚本的修改版本。似乎 nexts 和 steps 的 while 循环覆盖了任何输出请求。当我删除列表末尾的循环时，回溯确实出现了。
新的 gdb 脚本
set confirm off
set pagination off
set logging file gdbrogue.txt
set logging overwrite on
set logging on
set breakpoint pending on
#set trace-commands on
directory /home/me/src/github/rogue-54-for-rogomatic
symbol-file -readnow /usr/local/bin/rogue
skip file hardscroll.c
skip file hashmap.c
skip file lib_addch.c
skip file lib_addstr.c
skip file lib_clreol.c
skip file lib_erase.c
skip file lib_getch.c
skip file lib_move.c
skip file lib_mvcur.c
skip file lib_refresh.c
skip file lib_touch.c
skip file lib_tparm.c
skip file lib_tputs.c
skip file lib_winch.c
skip file lib_window.c
skip file tty_update.c
skip function look
skip function msg
skip function read
skip function unctrl
skip function __kernel_vsyscall
define my_prt_mlist
set $current = mlist
while ($current > 0)
printf "curr %p prev %p next %p\n", $current, $current->l_prev, $current->l_next
printf " t_type %c\n", $current->t_type
printf " t_pos.y %d t_pos.x %d\n", $current->t_pos.y, $current->t_pos.x
if ($current->t_dest > 0)
printf " t_dest->y %d t_dest->x %d\n", $current->t_dest->y, $current->t_dest->x
end
set $current = $current->l_next
end
end
break chase.c:453 if (level == 7)
commands
my_prt_mlist
backtrace full
end
cont
File hardscroll.c will be skipped when stepping.
File hashmap.c will be skipped when stepping.
File lib_addch.c will be skipped when stepping.
File lib_addstr.c will be skipped when stepping.
File lib_clreol.c will be skipped when stepping.
File lib_erase.c will be skipped when stepping.
File lib_getch.c will be skipped when stepping.
File lib_move.c will be skipped when stepping.
File lib_mvcur.c will be skipped when stepping.
File lib_refresh.c will be skipped when stepping.
File lib_touch.c will be skipped when stepping.
File lib_tparm.c will be skipped when stepping.
File lib_tputs.c will be skipped when stepping.
File lib_winch.c will be skipped when stepping.
File lib_window.c will be skipped when stepping.
File tty_update.c will be skipped when stepping.
Function look will be skipped when stepping.
Function msg will be skipped when stepping.
Function read will be skipped when stepping.
Function unctrl will be skipped when stepping.
Function __kernel_vsyscall will be skipped when stepping.
Breakpoint 1 at 0x5662b9a7: file chase.c, line 454.
Breakpoint 1, roomin (cp=0x577483cc) at chase.c:454
454 msg("in some bizarre place (%d, %d)", unc(*cp));
curr 0x577483c0 prev (nil) next 0x57748480
t_type Z
t_pos.y 18 t_pos.x 8
t_dest->y 10 t_dest->x 19
curr 0x57748480 prev 0x577483c0 next 0x57747dc0
t_type S
t_pos.y 8 t_pos.x 19
t_dest->y 10 t_dest->x 19
curr 0x57747dc0 prev 0x57748480 next 0x57746de0
t_type S
t_pos.y 9 t_pos.x 65
t_dest->y 10 t_dest->x 19
curr 0x57746de0 prev 0x57747dc0 next 0x57748300
t_type C
t_pos.y 10 t_pos.x 8
t_dest->y 542792192 t_dest->x 18
curr 0x57748300 prev 0x57746de0 next 0x577482a0
t_type B
t_pos.y 10 t_pos.x 47
curr 0x577482a0 prev 0x57748300 next 0x577481e0
t_type Z
t_pos.y 10 t_pos.x 30
curr 0x577481e0 prev 0x577482a0 next 0x57748120
t_type R
t_pos.y 10 t_pos.x 29
curr 0x57748120 prev 0x577481e0 next 0x577480c0
t_type O
t_pos.y 12 t_pos.x 37
curr 0x577480c0 prev 0x57748120 next 0x57748060
t_type I
t_pos.y 12 t_pos.x 39
curr 0x57748060 prev 0x577480c0 next 0x57747fa0
t_type Z
t_pos.y 11 t_pos.x 43
curr 0x57747fa0 prev 0x57748060 next 0x57746c00
t_type H
t_pos.y 10 t_pos.x 45
curr 0x57746c00 prev 0x57747fa0 next 0x57746d80
t_type I
t_pos.y 18 t_pos.x 15
curr 0x57746d80 prev 0x57746c00 next (nil)
t_type L
t_pos.y 5 t_pos.x 22
#0 roomin (cp=0x577483cc) at chase.c:454
rp = <optimized out>
fp = <optimized out>
#1 0x5662c3c1 in do_chase (th=0x57746de0) at chase.c:137
cp = <optimized out>
rer = 0x56653364 <passages+132>
ree = <optimized out>
mindist = 32767
curdist = <optimized out>
stoprun = false
door = <optimized out>
obj = <optimized out>
this = {x = 65, y = 9}
#2 0x5662c74d in move_monst (tp=0x57746de0) at chase.c:68
No locals.
#3 0x5662c7f3 in runners () at chase.c:41
tp = 0x57746de0
next = 0x57748300
wastarget = false
orig_pos = {x = 8, y = 10}
#4 0x5662df79 in do_daemons (flag=2) at daemon.c:114
dev = 0x56655e20 <d_list>
#5 0x5662de0e in command () at command.c:484
ch = <optimized out>
ntimes = -1
fp = <optimized out>
mp = <optimized out>
countch = 115 's'
direction = 75 'K'
newcount = 1 '[=11=]1'
#6 0x566311b7 in playit () at main.c:322
opts = <optimized out>
#7 0x5663162d in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at main.c:188
env = <optimized out>
lowtime = <optimized out>
pid = <optimized out>
pidfilename = "roguepid.10955", '[=11=]0' <repeats 49 times>
pidfp = <optimized out>
[Inferior 1 (process 10955) detached]
我正在尝试在到达 C 代码中的一行时获取回溯。
我将命令文件提供给 gdb，它工作正常，但到达断点时没有任何反应。
我正在使用带有 gdb 版本 9.1-3 的 Debian 测试
我的代码是用 CFLAGS 编译的：
-Og -g3 -m32 -gdwarf-4 -fvar-tracking-assignments -w
gcc 版本是 (Debian 9.3.0-10) 9.3.0
使用其他版本的 dwarf 似乎没有任何区别。
我包含的命令文件是：
set confirm off
set pagination off
set logging file gdbrogue.txt
set logging overwrite on
set logging on
set breakpoint pending on
#set trace-commands on
directory /home/me/src/github/rogue-54-for-rogomatic
symbol-file -readnow /usr/local/bin/rogue
skip file hardscroll.c
skip file hashmap.c
skip file lib_addch.c
skip file lib_addstr.c
skip file lib_clreol.c
skip file lib_erase.c
skip file lib_getch.c
skip file lib_move.c
skip file lib_mvcur.c
skip file lib_refresh.c
skip file lib_touch.c
skip file lib_tparm.c
skip file lib_tputs.c
skip file lib_winch.c
skip file lib_window.c
skip file tty_update.c
skip function look
skip function msg
skip function read
skip function unctrl
skip function __kernel_vsyscall
define my_prt_mlist
set $current = mlist
while ($current > 0)
printf "curr %p prev %p next %p\n", $current, $current->l_prev, $current->l_next
printf " t_type %c\n", $current->t_type
printf " t_pos.y %d t_pos.x %d\n", $current->t_pos.y, $current->t_pos.x
if ($current->t_dest > 0)
printf " t_dest->y %d t_dest->x %d\n", $current->t_dest->y, $current->t_dest->x
end
set $current = $current->l_next
end
end
break chase.c:32 if (level == 7)
commands
printf "player(y,x) (%d,%d)\n", player.t_pos.y, player.t_pos.x
my_prt_mlist
end
break chase.c:455 if (level == 7)
commands
printf "player(y,x) (%d,%d)\n", player.t_pos.y, player.t_pos.x
my_prt_mlist
backtrace full
end
while (level < 7)
next
end
while (level == 7)
step
end
while (level > 7)
next
end
输出显示到达中断但没有回溯显示？
roomin (cp=0x582403cc) at chase.c:445
445 roomin(coord *cp) {
452 if (((cp->x > MAXCOLS) || (cp->y > MAXLINES)) ||
454 msg("in some bizarre place (%d, %d)", unc(*cp));
Breakpoint 2, roomin (cp=0x582403cc) at chase.c:455
455 return NULL;
do_chase (th=0x5823ede0) at chase.c:142
142 door = (chat(th->t_pos.y, th->t_pos.x) == DOOR);
知道我在这里做错了什么或者这是一个 gdb/gcc 错误吗？
我寻找过类似的问题和答案，但 none 似乎有这个特定问题。
谢谢！ :)
好的，经过各种试验和阅读，我终于至少得到了上述脚本的修改版本。似乎 nexts 和 steps 的 while 循环覆盖了任何输出请求。当我删除列表末尾的循环时，回溯确实出现了。
新的 gdb 脚本
set confirm off
set pagination off
set logging file gdbrogue.txt
set logging overwrite on
set logging on
set breakpoint pending on
#set trace-commands on
directory /home/me/src/github/rogue-54-for-rogomatic
symbol-file -readnow /usr/local/bin/rogue
skip file hardscroll.c
skip file hashmap.c
skip file lib_addch.c
skip file lib_addstr.c
skip file lib_clreol.c
skip file lib_erase.c
skip file lib_getch.c
skip file lib_move.c
skip file lib_mvcur.c
skip file lib_refresh.c
skip file lib_touch.c
skip file lib_tparm.c
skip file lib_tputs.c
skip file lib_winch.c
skip file lib_window.c
skip file tty_update.c
skip function look
skip function msg
skip function read
skip function unctrl
skip function __kernel_vsyscall
define my_prt_mlist
set $current = mlist
while ($current > 0)
printf "curr %p prev %p next %p\n", $current, $current->l_prev, $current->l_next
printf " t_type %c\n", $current->t_type
printf " t_pos.y %d t_pos.x %d\n", $current->t_pos.y, $current->t_pos.x
if ($current->t_dest > 0)
printf " t_dest->y %d t_dest->x %d\n", $current->t_dest->y, $current->t_dest->x
end
set $current = $current->l_next
end
end
break chase.c:453 if (level == 7)
commands
my_prt_mlist
backtrace full
end
cont
File hardscroll.c will be skipped when stepping.
File hashmap.c will be skipped when stepping.
File lib_addch.c will be skipped when stepping.
File lib_addstr.c will be skipped when stepping.
File lib_clreol.c will be skipped when stepping.
File lib_erase.c will be skipped when stepping.
File lib_getch.c will be skipped when stepping.
File lib_move.c will be skipped when stepping.
File lib_mvcur.c will be skipped when stepping.
File lib_refresh.c will be skipped when stepping.
File lib_touch.c will be skipped when stepping.
File lib_tparm.c will be skipped when stepping.
File lib_tputs.c will be skipped when stepping.
File lib_winch.c will be skipped when stepping.
File lib_window.c will be skipped when stepping.
File tty_update.c will be skipped when stepping.
Function look will be skipped when stepping.
Function msg will be skipped when stepping.
Function read will be skipped when stepping.
Function unctrl will be skipped when stepping.
Function __kernel_vsyscall will be skipped when stepping.
Breakpoint 1 at 0x5662b9a7: file chase.c, line 454.
Breakpoint 1, roomin (cp=0x577483cc) at chase.c:454
454 msg("in some bizarre place (%d, %d)", unc(*cp));
curr 0x577483c0 prev (nil) next 0x57748480
t_type Z
t_pos.y 18 t_pos.x 8
t_dest->y 10 t_dest->x 19
curr 0x57748480 prev 0x577483c0 next 0x57747dc0
t_type S
t_pos.y 8 t_pos.x 19
t_dest->y 10 t_dest->x 19
curr 0x57747dc0 prev 0x57748480 next 0x57746de0
t_type S
t_pos.y 9 t_pos.x 65
t_dest->y 10 t_dest->x 19
curr 0x57746de0 prev 0x57747dc0 next 0x57748300
t_type C
t_pos.y 10 t_pos.x 8
t_dest->y 542792192 t_dest->x 18
curr 0x57748300 prev 0x57746de0 next 0x577482a0
t_type B
t_pos.y 10 t_pos.x 47
curr 0x577482a0 prev 0x57748300 next 0x577481e0
t_type Z
t_pos.y 10 t_pos.x 30
curr 0x577481e0 prev 0x577482a0 next 0x57748120
t_type R
t_pos.y 10 t_pos.x 29
curr 0x57748120 prev 0x577481e0 next 0x577480c0
t_type O
t_pos.y 12 t_pos.x 37
curr 0x577480c0 prev 0x57748120 next 0x57748060
t_type I
t_pos.y 12 t_pos.x 39
curr 0x57748060 prev 0x577480c0 next 0x57747fa0
t_type Z
t_pos.y 11 t_pos.x 43
curr 0x57747fa0 prev 0x57748060 next 0x57746c00
t_type H
t_pos.y 10 t_pos.x 45
curr 0x57746c00 prev 0x57747fa0 next 0x57746d80
t_type I
t_pos.y 18 t_pos.x 15
curr 0x57746d80 prev 0x57746c00 next (nil)
t_type L
t_pos.y 5 t_pos.x 22
#0 roomin (cp=0x577483cc) at chase.c:454
rp = <optimized out>
fp = <optimized out>
#1 0x5662c3c1 in do_chase (th=0x57746de0) at chase.c:137
cp = <optimized out>
rer = 0x56653364 <passages+132>
ree = <optimized out>
mindist = 32767
curdist = <optimized out>
stoprun = false
door = <optimized out>
obj = <optimized out>
this = {x = 65, y = 9}
#2 0x5662c74d in move_monst (tp=0x57746de0) at chase.c:68
No locals.
#3 0x5662c7f3 in runners () at chase.c:41
tp = 0x57746de0
next = 0x57748300
wastarget = false
orig_pos = {x = 8, y = 10}
#4 0x5662df79 in do_daemons (flag=2) at daemon.c:114
dev = 0x56655e20 <d_list>
#5 0x5662de0e in command () at command.c:484
ch = <optimized out>
ntimes = -1
fp = <optimized out>
mp = <optimized out>
countch = 115 's'
direction = 75 'K'
newcount = 1 '[=11=]1'
#6 0x566311b7 in playit () at main.c:322
opts = <optimized out>
#7 0x5663162d in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at main.c:188
env = <optimized out>
lowtime = <optimized out>
pid = <optimized out>
pidfilename = "roguepid.10955", '[=11=]0' <repeats 49 times>
pidfp = <optimized out>
[Inferior 1 (process 10955) detached]