如何在GDB中的断点处打印源的当前行而不打印其他内容？
我想在如何在GDB中的断点处打印源的当前行而不打印其他内容？,gdb,Gdb,我想在gdb中设置一个“滚动”断点；这里只需打印当前源行和一些信息；然后继续。我从以下内容开始： break doSomething commands continue end 它自己打印出： Breakpoint 1, doSomething () at myprog.c:55 55 void doSomething() { 我想删除“Breakpoint X…at…”消息，这可以通过静默-完成，然后只打印出源代码行；所以我试着： break doSomething commands
gdbbreak doSomething
commands
continue
end
Breakpoint 1, doSomething () at myprog.c:55
55 void doSomething() {
静默break doSomething
commands
silent
list
continue
end
50 // some comments
...
55 void doSomething() {
...
59 // other comments
列表1list+0时，+0实际上只提供一行源代码-但行错误（在我的例子中，它给出了第50行）
因此，我意识到可以使用程序计数器$pc
，获取并打印当前程序地址，并且可以在程序地址周围列出，因此我尝试了以下方法：
break doSomething
commands
silent
#print $pc
list *$pc,+0
continue
end
这会产生正确的源代码行-但出于某种原因，再次显示一条额外的消息，这一次是“ADDR在X中…”：
有没有办法只打印源代码行
作为一个子问题-是否可以以某种方式捕获list
命令的输出，并将其用作gdb脚本方言中printf
的参数？（我非常确定捕获gdb
命令输出可以通过python-gdb脚本完成）好吧，我想我用gdb的python做得更好了；现在我可以得到如下输出（使用gdb 7.3.50.20110806-cvs）：
在大多数情况下，我试图用它来解决这个问题（结果也有一个关于这个的问题：）
但是，由于某种原因，当我使用“指示此对象的当前行号”的Symtab\u和\u line.line
时，它似乎没有改变？在上面的示例中，它是方括号中的第一个数字，并且始终位于56（在这两种情况下都是错误的）。人们希望API能够涵盖所有这些内容；虽然行号在那里（尽管是错的？），但作为对象属性，我在任何地方都找不到相应源代码行的字符串内容。另一方面，当我使用gdb.execute（“list*$pc，+0”）
根据OP直接查询gdb
当前行时，我得到了正确的行号-但随后，我必须在Python中额外拆分和解析字符串：/
不过，总比没有好——下面是（嵌入gdb脚本中的Python）代码；把它扔进你的.gdbinit
：
python
# example: these breakpoints do stop - but cannot change their
# stop method (which contains the "commands" for breakpoint in python)
#ax = gdb.Breakpoint("doSomething")
#print("hello", ax)
#print(dir(ax))
#print(ax.expression, ax.condition, ax.commands) # not writable!
#bx = gdb.Breakpoint("myprog.c:63")
# anything more than that - need to subclass:
class MyBreakpoint(gdb.Breakpoint):
def __init__(self, spec, command=""):
super(MyBreakpoint, self).__init__(spec, gdb.BP_BREAKPOINT,
internal = False)
self.command = command # not used
def stop(self):
# gdb.write - like print
# gdb.decode_line() - like gdb.find_pc_line(pc)
current_line = gdb.decode_line()
symtline = current_line[1][0]
#print(current_line, symtline.is_valid(), symtline.line , symtline.pc , symtline.symtab )
sysy = symtline.symtab
#print(sysy.filename, sysy.fullname(), sysy.is_valid() )
sysyo = sysy.objfile
#print(sysyo.filename, sysyo.is_valid(), sysyo.pretty_printers)
###print(gdb.solib_name()) # this breaks stuff??!
sourcefilename = sysy.filename
sourcefullpath = sysy.fullname()
sourcelinenum = symtline.line # somehow, it may be offset by 1, from what "list *$pc says"
listingline = gdb.execute("list *$pc,+0", to_string=True)
#print( "BREAK at %s:%d -- %s" % (sourcefilename, sourcelinenum, listingline) )
llsplit = listingline.split("\n")
listpreamble, gdbsourceline = llsplit[:2]
addr, noneed, noneed, funcname, fileloc = listpreamble.split(" ")[:5]
#linenum, sourceline = gdbsourceline.split("\t")[:2] # not using these - put gdb line verbatim
outline = "[% 4s] %s % 16s:%s" % (sourcelinenum, addr, sourcefilename[-16:], gdbsourceline)
print(outline)
return False # continue (do not stop inferior)
ax = MyBreakpoint("doSomething")
bx = MyBreakpoint("myprog.c:63")
end
run
另外：python打印（gdb.execute（“list*$pc，+0”，False，True）。splitlines（）[1]）
[ 56] 0x8048fe0 myprog.c:55 void doSomething() {
[ 56] 0x8049058 myprog.c:63 }
python
# example: these breakpoints do stop - but cannot change their
# stop method (which contains the "commands" for breakpoint in python)
#ax = gdb.Breakpoint("doSomething")
#print("hello", ax)
#print(dir(ax))
#print(ax.expression, ax.condition, ax.commands) # not writable!
#bx = gdb.Breakpoint("myprog.c:63")
# anything more than that - need to subclass:
class MyBreakpoint(gdb.Breakpoint):
def __init__(self, spec, command=""):
super(MyBreakpoint, self).__init__(spec, gdb.BP_BREAKPOINT,
internal = False)
self.command = command # not used
def stop(self):
# gdb.write - like print
# gdb.decode_line() - like gdb.find_pc_line(pc)
current_line = gdb.decode_line()
symtline = current_line[1][0]
#print(current_line, symtline.is_valid(), symtline.line , symtline.pc , symtline.symtab )
sysy = symtline.symtab
#print(sysy.filename, sysy.fullname(), sysy.is_valid() )
sysyo = sysy.objfile
#print(sysyo.filename, sysyo.is_valid(), sysyo.pretty_printers)
###print(gdb.solib_name()) # this breaks stuff??!
sourcefilename = sysy.filename
sourcefullpath = sysy.fullname()
sourcelinenum = symtline.line # somehow, it may be offset by 1, from what "list *$pc says"
listingline = gdb.execute("list *$pc,+0", to_string=True)
#print( "BREAK at %s:%d -- %s" % (sourcefilename, sourcelinenum, listingline) )
llsplit = listingline.split("\n")
listpreamble, gdbsourceline = llsplit[:2]
addr, noneed, noneed, funcname, fileloc = listpreamble.split(" ")[:5]
#linenum, sourceline = gdbsourceline.split("\t")[:2] # not using these - put gdb line verbatim
outline = "[% 4s] %s % 16s:%s" % (sourcelinenum, addr, sourcefilename[-16:], gdbsourceline)
print(outline)
return False # continue (do not stop inferior)
ax = MyBreakpoint("doSomething")
bx = MyBreakpoint("myprog.c:63")
end
run