How to use the gprof2dot.LineParser function in gprof2dot

call[TOTAL_TIME] = ratio(value, nc)*ct

                caller.add_call(call)

        if False:
            self.stats.print_stats()
            self.stats.print_callees()

        # Compute derived events
        self.profile.validate()
        self.profile.ratio(TIME_RATIO, TIME)
        self.profile.ratio(TOTAL_TIME_RATIO, TOTAL_TIME)

        return self.profile

class DtraceParser(LineParser):
    """Parser for linux perf callgraph output.

    It expects output generated with
        
        # Refer to https://github.com/brendangregg/FlameGraph#dtrace
        # 60 seconds of user-level stacks, including time spent in-kernel, for PID 12345 at 97 Hertz     
        sudo dtrace -x ustackframes=100 -n 'profile-97 /pid == 12345/ { @[ustack()] = count(); } tick-60s { exit(0); }' -o out.user_stacks
        
        # The dtrace output
        gprof2dot.py -f dtrace out.user_stacks

        # Notice: sometimes, the dtrace outputs format may be latin-1, and gprof2dot will fail to parse it.
        # To solve this problem, you should use iconv to convert to UTF-8 explicitly.
        # TODO: add an encoding flag to tell gprof2dot how to decode the profile file.
        iconv -f ISO-8859-1 -t UTF-8 out.user_stacks | gprof2dot.py -f dtrace
    """

function_id = function_name + ':' + module

        try:
            function = self.profile.functions[function_id]
        except KeyError:
            function = Function(function_id, function_name)
            function.module = os.path.basename(module)
            function[SAMPLES] = 0
            function[TOTAL_SAMPLES] = 0
            self.profile.add_function(function)

        return function


class OprofileParser(LineParser):
    """Parser for oprofile callgraph output.
    
    See also:
    - http://oprofile.sourceforge.net/doc/opreport.html#opreport-callgraph
    """

    _fields_re = {
        'samples': r'(\d+)',
        '%': r'(\S+)',
        'linenr info': r'(?P<source>\(no location information\)|\S+:\d+)',
        'image name': r'(?P<img>\S+(?:\s\(tgid:[^)]*\))?)',
        'app name': r'(?P\S+)',
        'symbol name': r'(?P

def get_callee(self):
        module = self.positions.get('cob', '')
        filename = self.positions.get('cfi', '') 
        function = self.positions.get('cfn', '') 
        return self.make_function(module, filename, function)

    def readline(self):
        # Override LineParser.readline to ignore comment lines
        while True:
            LineParser.readline(self)
            if self.eof() or not self.lookahead().startswith('#'):
                break


class PerfParser(LineParser):
    """Parser for linux perf callgraph output.

    It expects output generated with

        perf record -g
        perf script | gprof2dot.py --format=perf
    """

    def __init__(self, infile):
        LineParser.__init__(self, infile)
        self.profile = Profile()

    def readline(self):
        # Override LineParser.readline to ignore comment lines
        while True:
            LineParser.readline(self)

return line.startswith('samples')

    def match_separator(self):
        line = self.lookahead()
        return line == '-'*len(line)

    def match_primary(self):
        line = self.lookahead()
        return not line[:1].isspace()
    
    def match_secondary(self):
        line = self.lookahead()
        return line[:1].isspace()


class HProfParser(LineParser):
    """Parser for java hprof output
    
    See also:
    - http://java.sun.com/developer/technicalArticles/Programming/HPROF.html
    """

    trace_re = re.compile(r'\t(.*)\((.*):(.*)\)')
    trace_id_re = re.compile(r'^TRACE (\d+):$')

    def __init__(self, infile):
        LineParser.__init__(self, infile)
        self.traces = {}
        self.samples = {}

    def parse(self):
        # read lookahead

profile.validate()
        profile.ratio(TIME_RATIO, TIME)
        # Lacking call counts, fake call ratios based on total times.
        profile.call_ratios(TOTAL_TIME_RATIO)
        # The TOTAL_TIME_RATIO of functions is already set.  Propagate that
        # total time to the calls.  (TOTAL_TIME is neither set nor used.)
        for function in compat_itervalues(profile.functions):
            for call in compat_itervalues(function.calls):
                if call.ratio is not None:
                    callee = profile.functions[call.callee_id]
                    call[TOTAL_TIME_RATIO] = call.ratio * callee[TOTAL_TIME_RATIO]

        return profile


class CallgrindParser(LineParser):
    """Parser for valgrind's callgrind tool.
    
    See also:
    - http://valgrind.org/docs/manual/cl-format.html
    """

    _call_re = re.compile(r'^calls=\s*(\d+)\s+((\d+|\+\d+|-\d+|\*)\s+)+$')

    def __init__(self, infile):
        LineParser.__init__(self, infile)

        # Textual positions
        self.position_ids = {}
        self.positions = {}

        # Numeric positions