gdb ./gdb/gdb 中backtrace调用堆栈[gdb-7.10]

gdb backtrace简单分三步，查找是否支持当前命令 -> 校验gdb调试器扩展 -> 执行并显示结果。
1) 查找backtrace命令执行函数，调用堆栈1为：

(gdb) bt
#0  exceptions_state_mc (action=action@entry=CATCH_ITER) at ./common/common-exceptions.c:177
#1  0x00000000006c8917 in exceptions_state_mc_action_iter () at ./common/common-exceptions.c:207
#2  0x000000000050d685 in gdbpy_apply_frame_filter (extlang=<optimized out>, frame=0x29b3c90, flags=7, args_type=CLI_SCALAR_VALUES,
    out=0x2a8b5a0, frame_low=0, frame_high=-1) at ./python/py-framefilter.c:1530
#3  0x00000000005c1c28 in apply_ext_lang_frame_filter (frame=0x29b3c90, flags=flags@entry=7,
    args_type=args_type@entry=CLI_SCALAR_VALUES, out=out@entry=0x2a8b5a0, frame_low=frame_low@entry=0, frame_high=frame_high@entry=-1)
    at extension.c:569
#4  0x00000000005bb573 in backtrace_command_1 (from_tty=1, no_filters=0, show_locals=0, count_exp=0x0) at stack.c:1820
#5  backtrace_command (arg=0x0, from_tty=1) at stack.c:1935
#6  0x00000000006912dd in execute_command (p=<optimized out>, p@entry=0x28ee190 "bt", from_tty=1) at top.c:468
#7  0x00000000005cb681 in command_handler (command=0x28ee190 "bt") at event-top.c:494
#8  0x00000000005cbbdc in command_line_handler (rl=<optimized out>) at event-top.c:692
#9  0x00000000006e4fd0 in rl_callback_read_char () at callback.c:220
#10 0x00000000005cb6e9 in rl_callback_read_char_wrapper (client_data=<optimized out>) at event-top.c:171
#11 0x00000000005cb733 in stdin_event_handler (error=<optimized out>, client_data=0x0) at event-top.c:432
#12 0x00000000005ca5fd in gdb_wait_for_event (block=block@entry=1) at event-loop.c:834
#13 0x00000000005ca842 in gdb_do_one_event () at event-loop.c:323
#14 0x00000000005ca8be in start_event_loop () at event-loop.c:347
#15 0x00000000005c4423 in captured_command_loop (data=data@entry=0x0) at main.c:318
#16 0x00000000005c137d in catch_errors (func=func@entry=0x5c4410 <captured_command_loop>, func_args=func_args@entry=0x0,
    errstring=errstring@entry=0x7bc022 "", mask=mask@entry=RETURN_MASK_ALL) at exceptions.c:240
#17 0x00000000005c53be in captured_main (data=data@entry=0x7ffc1edbfea0) at main.c:1157
#18 0x00000000005c137d in catch_errors (func=func@entry=0x5c4950 <captured_main>, func_args=func_args@entry=0x7ffc1edbfea0,
    errstring=errstring@entry=0x7bc022 "", mask=mask@entry=RETURN_MASK_ALL) at exceptions.c:240
#19 0x00000000005c586b in gdb_main (args=args@entry=0x7ffc1edbfea0) at main.c:1165
#20 0x00000000004627b5 in main (argc=<optimized out>, argv=<optimized out>) at gdb.c:32

2)判断是否设置python扩展，调用堆栈2为：

(gdb) bt
#0  frame_unwind_pc (this_frame=0x29b3bc0) at frame.c:867
#1  0x000000000069a4d9 in get_frame_pc_if_available (frame=frame@entry=0x29b3c90, pc=pc@entry=0x7ffc1edbf930) at frame.c:2231
#2  0x000000000069bd2c in get_prev_frame (this_frame=this_frame@entry=0x29b3c90) at frame.c:2131
#3  0x000000000050afc5 in frame_info_to_frame_object (frame=frame@entry=0x29b3c90) at ./python/py-frame.c:377
#4  0x000000000050d6f8 in bootstrap_python_frame_filters (frame_high=-1, frame_low=0, frame=0x29b3c90)
    at ./python/py-framefilter.c:1448
#5  gdbpy_apply_frame_filter (extlang=<optimized out>, frame=0x29b3c90, flags=7, args_type=CLI_SCALAR_VALUES, out=0x2a8b5a0,
    frame_low=0, frame_high=-1) at ./python/py-framefilter.c:1543
#6  0x00000000005c1c28 in apply_ext_lang_frame_filter (frame=0x29b3c90, flags=flags@entry=7,
    args_type=args_type@entry=CLI_SCALAR_VALUES, out=out@entry=0x2a8b5a0, frame_low=frame_low@entry=0, frame_high=frame_high@entry=-1)
    at extension.c:569
#7  0x00000000005bb573 in backtrace_command_1 (from_tty=1, no_filters=0, show_locals=0, count_exp=0x0) at stack.c:1820
#8  backtrace_command (arg=0x0, from_tty=1) at stack.c:1935
#9  0x00000000006912dd in execute_command (p=<optimized out>, p@entry=0x28ee190 "bt", from_tty=1) at top.c:468
#10 0x00000000005cb681 in command_handler (command=0x28ee190 "bt") at event-top.c:494
#11 0x00000000005cbbdc in command_line_handler (rl=<optimized out>) at event-top.c:692
#12 0x00000000006e4fd0 in rl_callback_read_char () at callback.c:220
#13 0x00000000005cb6e9 in rl_callback_read_char_wrapper (client_data=<optimized out>) at event-top.c:171
#14 0x00000000005cb733 in stdin_event_handler (error=<optimized out>, client_data=0x0) at event-top.c:432
#15 0x00000000005ca5fd in gdb_wait_for_event (block=block@entry=1) at event-loop.c:834
#16 0x00000000005ca842 in gdb_do_one_event () at event-loop.c:323
#17 0x00000000005ca8be in start_event_loop () at event-loop.c:347
#18 0x00000000005c4423 in captured_command_loop (data=data@entry=0x0) at main.c:318
#19 0x00000000005c137d in catch_errors (func=func@entry=0x5c4410 <captured_command_loop>, func_args=func_args@entry=0x0,
    errstring=errstring@entry=0x7bc022 "", mask=mask@entry=RETURN_MASK_ALL) at exceptions.c:240
#20 0x00000000005c53be in captured_main (data=data@entry=0x7ffc1edbfea0) at main.c:1157
#21 0x00000000005c137d in catch_errors (func=func@entry=0x5c4950 <captured_main>, func_args=func_args@entry=0x7ffc1edbfea0,
    errstring=errstring@entry=0x7bc022 "", mask=mask@entry=RETURN_MASK_ALL) at exceptions.c:240
#22 0x00000000005c586b in gdb_main (args=args@entry=0x7ffc1edbfea0) at main.c:1165
#23 0x00000000004627b5 in main (argc=<optimized out>, argv=<optimized out>) at gdb.c:32

3)显示堆栈，调用堆栈3为：

(gdb) bt
#0  0x00000000006bf4dc in skip_spaces_const (chp=chp@entry=0x29603b0 "main") at ./common/common-utils.c:275
#1  0x0000000000607ef3 in msymbol_hash_iw (string=string@entry=0x29603b0 "main") at minsyms.c:89
#2  0x0000000000607fda in lookup_minimal_symbol (name=0x29603b0 "main", sfile=sfile@entry=0x0, objf=objf@entry=0x2a9a9c0)
    at minsyms.c:172
#3  0x000000000069bd8f in inside_main_func (this_frame=0x29b3c90) at frame.c:2088
#4  get_prev_frame (this_frame=this_frame@entry=0x29b3c90) at frame.c:2147
#5  0x000000000050afc5 in frame_info_to_frame_object (frame=frame@entry=0x29b3c90) at ./python/py-frame.c:377
#6  0x000000000050d6f8 in bootstrap_python_frame_filters (frame_high=-1, frame_low=0, frame=0x29b3c90)
    at ./python/py-framefilter.c:1448
#7  gdbpy_apply_frame_filter (extlang=<optimized out>, frame=0x29b3c90, flags=7, args_type=CLI_SCALAR_VALUES, out=0x2a8b5a0,
    frame_low=0, frame_high=-1) at ./python/py-framefilter.c:1543
#8  0x00000000005c1c28 in apply_ext_lang_frame_filter (frame=0x29b3c90, flags=flags@entry=7,
    args_type=args_type@entry=CLI_SCALAR_VALUES, out=out@entry=0x2a8b5a0, frame_low=frame_low@entry=0, frame_high=frame_high@entry=-1)
    at extension.c:569
#9  0x00000000005bb573 in backtrace_command_1 (from_tty=1, no_filters=0, show_locals=0, count_exp=0x0) at stack.c:1820
#10 backtrace_command (arg=0x0, from_tty=1) at stack.c:1935
#11 0x00000000006912dd in execute_command (p=<optimized out>, p@entry=0x28ee190 "bt", from_tty=1) at top.c:468
#12 0x00000000005cb681 in command_handler (command=0x28ee190 "bt") at event-top.c:494
#13 0x00000000005cbbdc in command_line_handler (rl=<optimized out>) at event-top.c:692
#14 0x00000000006e4fd0 in rl_callback_read_char () at callback.c:220
#15 0x00000000005cb6e9 in rl_callback_read_char_wrapper (client_data=<optimized out>) at event-top.c:171
#16 0x00000000005cb733 in stdin_event_handler (error=<optimized out>, client_data=0x0) at event-top.c:432
#17 0x00000000005ca5fd in gdb_wait_for_event (block=block@entry=1) at event-loop.c:834
#18 0x00000000005ca842 in gdb_do_one_event () at event-loop.c:323
#19 0x00000000005ca8be in start_event_loop () at event-loop.c:347
#20 0x00000000005c4423 in captured_command_loop (data=data@entry=0x0) at main.c:318
#21 0x00000000005c137d in catch_errors (func=func@entry=0x5c4410 <captured_command_loop>, func_args=func_args@entry=0x0,
    errstring=errstring@entry=0x7bc022 "", mask=mask@entry=RETURN_MASK_ALL) at exceptions.c:240
#22 0x00000000005c53be in captured_main (data=data@entry=0x7ffc1edbfea0) at main.c:1157
#23 0x00000000005c137d in catch_errors (func=func@entry=0x5c4950 <captured_main>, func_args=func_args@entry=0x7ffc1edbfea0,
    errstring=errstring@entry=0x7bc022 "", mask=mask@entry=RETURN_MASK_ALL) at exceptions.c:240
#24 0x00000000005c586b in gdb_main (args=args@entry=0x7ffc1edbfea0) at main.c:1165
#25 0x00000000004627b5 in main (argc=<optimized out>, argv=<optimized out>) at gdb.c:32