有没有人有GDB漂亮
gdb的现代版本允许将Python代码集成到“漂亮打印”复杂数据结构。 对于C ++的STL类以及一些更常见的boost.org
类型,有一些非常漂亮的打印机实现。
在网络编程中,通常会遇到select
/ poll
调用。 poll()
使用一组数据结构, select()
使用fd_set
。
有没有人跑过漂亮的打印机实现fd_set
,最好是便携式的,但即使是平台特定的也没关系。 理想情况下,它将是Linux / x86,但我会采取任何措施并希望能够适应。
Alrighty,这是我写的东西,在Linux下似乎适用于我。 请让我知道这对你有没有用:
anonprint.py
import gdb
class fd_set_printer:
"""
Prints an fd_set, which is normally an opaque
array of ints, each bit representing one file descriptor
"""
def __init__(self, val, val_array):
self.val = val
self.val_array = val_array
@staticmethod
def find_set_bits(bit_array):
"""
Finds set bits in a long bit list.
Expects a gdb.Value which contains a C array,
such as int[10], and treats it as a bitlist
of int_size * 10 bits long. Returns an array of
bit positions, starting with 0, for which the bits
are on.
e.g. for int foo[] = [1, 6], it will return [ 0, 33, 34 ]
The array should be given as a gdb.Value
"""
set_bits = []
bits_length = bit_array[0].type.sizeof * 8
current_bit = 0
# Can not use 'for current_byte in gdb.Value:' even if
# gdb.Value.type.code == gdb.TYPE_CODE_ARRAY
# So iteration happens this ugly C-style way
for current_byte_pos in xrange(*bit_array.type.range()):
current_byte = bit_array[current_byte_pos]
for bit in xrange(0, bits_length):
bit_mask = 1 << bit
if bit_mask & current_byte == bit_mask:
set_bits.append(current_bit)
current_bit += 1
return set_bits
def to_string(self):
fd_list = self.find_set_bits(self.val_array)
if len(fd_list) == 0:
output = "Empty file descriptor set."
else:
output = "File descriptor set: "
output += ', '.join(map(str, fd_list))
return output
def anon_struct_lookup_function(val):
"""
Checks if the given value looks like an fd_set.
If it does, delegates printing to the printer
"""
lookup_tag = val.type.tag
if lookup_tag == None:
return None
if lookup_tag != "<anonymous struct>":
return None
fields = val.type.fields()
val_array = None
if len(fields) == 1 and fields[0].name == 'fds_bits':
val_array = val['fds_bits']
elif len(fields) == 1 and fields[0].name == '__fds_bits':
val_array = val['__fds_bits']
if not val_array is None:
return fd_set_printer(val, val_array)
return None
def add_fd_set_printer(obj = gdb):
"Adds the fd_set pretty printer to the given object"
obj.pretty_printers.append(anon_struct_lookup_function)
然后让你的~/.gdbinit
:
python
import sys
sys.path.insert(0, '/home/user/anonprint_py_directory_here')
from anonprint import add_fd_set_printer
add_fd_set_printer()
end
这是我第一次尝试通过Python与gdb内部进行交互,所以我们欢迎评论和建议。
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