etrace

一个通过使用gcc的-finstrument-func参数进行debug的小工具.可以以树状结构打出动态执行时的函数调用.

#!/usr/bin/env python
# $Revision: 2.1 $

import string, os, sys, stat

# Create a TRACE file if none exists
def init_trace():
    try:
        os.stat("TRACE")
    except OSError:
        os.system("rm -f TRACE")
        os.mkfifo("TRACE")

# Remove TRACE if it exists
def end_trace():
    if stat.S_ISFIFO(os.stat("TRACE")[stat.ST_MODE]):
        os.remove("TRACE")
    sys.exit(0)

# Convert a hexadecimal string to an int
def hex_conv_1_5(s):
    return string.atoi(s, 16)

def hex_conv_2_0(s):
    return int(s, 16)

# Load symbols
def load_symbols(prog):
    f = os.popen("nm -o "+prog)
    sym = {}
    for line in f.readlines():
        s = string.split(line)
        val = hex_conv('0x'+string.split(s[0], ':')[1])
        name = s[2]
        sym[val]=name
    f.close()
    return sym

# Print a program's trace
def trace(prog):
    sym = load_symbols(prog)
    tr = open("TRACE")
    level = 0
    prevname = ""
    count=0
    while 1:
        l = tr.readline()
        if l:
            s = string.split(l)
            if s[0]=="EXIT":
                print "exit PID", s[1]
                end_trace()
            s1 = hex_conv(s[1])
            if s1 in sym.keys():
                name = sym[s1]
            else:
                name = "??"
            if s[0]=="enter":
                # Check if new name compared to previous input
                if prevname==name:
                    # was the counter counting?
                    if count==0:
                        # print function name
                        print '\n    '+level*'|   '+name,
                    count=count+1
                else:
                    # New name received. Was the counter counting?
                    if count>0:
                        print "(total: %d times)" % (count+1),
                        # re-initialize counter
                        count=0
                    print '\n    '+level*'|   '+name,
                level=level+1
                prevname = name
            else:
                level=level-1
                if name=="main":
                    if count>0:
                        print "(total: %d times)" % (count+1),
                    end_trace()
    tr.close()

# Main
if __name__=="__main__":
    if len(sys.argv)<2:
        print "Usage: analysis <binary name>"
        sys.exit(1)
    pyver = string.split(sys.version[:3], ".")
    if pyver < ['2','0']:
        hex_conv = hex_conv_1_5
    else:
        hex_conv = hex_conv_2_0
    init_trace()
    trace(sys.argv[1])