angr path in symblic execution

bu neng da pin yin , hao qi

ida cfg :

type python :

    irsb = proj.factory.block(addr=addr_main).vex
    main_state = proj.factory.blank_state(addr = addr_main)
    path = proj.factory.path(main_state)

    print hex(path.addr)
    path.step()
    print "path has " ,len(path.successors), 'successors'

    s = path.successors[0]
    print hex(path.addr)
    print hex(s.addr)
    s.step()
    print "another path has " ,len(s.successors), 'successors'
    s1 = s.successors[0]
    s2 = s.successors[1]
    print hex(s1.addr),hex(s2.addr)

    s1.step()
    s2.step()

    print "s1 path has ",len(s1.successors),'successors'
    print "s2 path has ",len(s2.successors),'successors'
    # s1_dead = s1.deadended[0]
    s2_1 = s2.successors[0]
    s2_2 = s2.successors[1]
    print 's2_1 addr:',hex(s2_1.addr)
    print 's2_2 addr:',hex(s2_2.addr)

code : 

path.step()

you will meet first jmp instruction , print it's addr:

print "path has " ,len(path.successors), 'successors'

    s = path.successors[0]
    print hex(path.addr)
    print hex(s.addr)

we get :

addr : 0x400576 is the start address of another block,so wo continue  stepping

    s.step()
    print "another path has " ,len(s.successors), 'successors'
    s1 = s.successors[0]
    s2 = s.successors[1]
    print hex(s1.addr),hex(s2.addr)

the output is :

another path has  2 successors
0x400581L 0x40054cL

wo meet the branches , so , we got 2 successors

addr : 0x400581L is the start address of last block

addr: 0x40054cL is the start address of another block

go on:

s1.step()
    s2.step()

    print "s1 path has ",len(s1.successors),'successors'
    print "s2 path has ",len(s2.successors),'successors'
    # s1_dead = s1.deadended[0]
    s2_1 = s2.successors[0]
    s2_2 = s2.successors[1]
    print 's2_1 addr:',hex(s2_1.addr)
    print 's2_2 addr:',hex(s2_2.addr)

we get:

s1 path has  0 successors
s2 path has  2 successors
s2_1 addr: 0x400581L
s2_2 addr: 0x40054cL

path s1  leads to  the end of function

path2 will continue in a loop