1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
from miasm2.expression.expression import *
from pdb import pm
print """
Expression simplification demo.
(and regression test)
"""
a = ExprId('a', 32)
b = ExprId('b', 32)
c = ExprId('c', 32)
d = ExprId('d', 32)
e = ExprId('e', 32)
m = ExprMem(a, 32)
s = a[:8]
i1 = ExprInt(0x1, 32)
i2 = ExprInt(0x2, 32)
cc = ExprCond(a, b, c)
o = ExprCompose(a[8:16], a[:8])
o2 = ExprCompose(a[8:16], a[:8])
l = [a[:8], b[:8], c[:8], m[:8], s, i1[:8], i2[:8], o[:8]]
l2 = l[::-1]
x = ExprMem(a + b + ExprInt(0x42, 32), 32)
def replace_expr(e):
# print 'visit', e
dct = {c + ExprInt(0x42, 32): d,
a + b: c, }
if e in dct:
return dct[e]
return e
print x
y = x.visit(replace_expr)
print y
print x.copy()
print y.copy()
print y == y.copy()
print repr(y), repr(y.copy())
z = ExprCompose(a[5:5 + 8], b[:16], x[:8])
print z
print z.copy()
print z[:31].copy().visit(replace_expr)
print 'replace'
print x.replace_expr({c + ExprInt(0x42, 32): d,
a + b: c, })
print z.replace_expr({c + ExprInt(0x42, 32): d,
a + b: c, })
u = z.copy()
print u
|