debug_with_python_in_gdb.py

#!/usr/bin/python
import subprocess
import re
import gdb

# This is just an example and might not work poperly!


class BreakpointAtMain(gdb.Breakpoint):
    def __init__(self):
        super(BreakpointAtMain, self).__init__("main")

    def stop(self):
        gdb.write("stopping at main()")

        return True

class TracePoint(gdb.Breakpoint):
    def __init__(self, tracePoint, traceObj, txt=None):
        super(TracePoint, self).__init__(tracePoint)
        self.traceObj = traceObj
        self.txt = txt

    def stop(self):
        txt = "OUTPUT: "
        if self.txt:
            txt += self.txt
        gdb.write(txt + "\n")

        gdb.write(self.traceObj + ": ")
        gdb.write(gdb.parse_and_eval(self.traceObj) + "\n")

        return True


class Executor:
  def __init__(self, cmd):
    self.__cmd = cmd

  def __call__(self):
    gdb.execute(self.__cmd)


def event_handler(event):
  if (isinstance(event, gdb.BreakpointEvent)):
    gdb.write("\n[BP]")
    return

  if (isinstance(event, gdb.SignalEvent)):
    gdb.execute("set scheduler-locking on")
    frame = gdb.selected_frame()
    cont = False
    while frame:
        function = str(frame.name())
        if "jvm" in function or "Java" in function:
        #gdb.write("Will break")
            cont = True
        frame = frame.older()

    gdb.execute("set scheduler-locking off")
    if cont:
        gdb.post_event(Executor("continue"))


def main():
    gdb.execute("set auto-solib-add on")

    gdb.execute('file testexecutable')
    gdb.execute("set args foo bar")

    gdb.execute('set logging on')
    gdb.execute('set logging file gdbout')

    # not working: gdb.execute("set scheduler-locking step")

    gdb.execute('shared mylib')
    
    gdb.execute('delete') # delete all old breakpoints

    # gdb.execute('catch throw')
    #gdb.execute('handle SIGSEGV noprint')
    gdb.execute('handle SIGSEGV stop')

    gdb.events.stop.connect(event_handler)

    # BreakpointAtMain()

    #gdb.Breakpoint("Myclass::baz")
    #bp = gdb.Breakpoint('break main.cpp:10')

    TracePoint("main.cpp:14",
               "foo.m_bar.size()", "bla")

    gdb.execute('run')

main()