Expression examples: Rename examples with meaningfull names

1 files changed, 73 insertions, 0 deletions

diff --git a/example/expression/simplification_tools.py b/example/expression/simplification_tools.py
new file mode 100644
index 00000000..ed147c04
--- /dev/null
+++ b/example/expression/simplification_tools.py
@@ -0,0 +1,73 @@
+from miasm2.expression.expression import *
+from miasm2.expression.simplifications import expr_simp
+from pdb import pm
+import os
+
+filename = os.environ.get('PYTHONSTARTUP')
+if filename and os.path.isfile(filename):
+    execfile(filename)
+
+print """
+Expression simplification demo.
+(and regression test)
+"""
+
+
+a = ExprId('a')
+b = ExprId('b')
+c = ExprId('c')
+d = ExprId('d')
+e = ExprId('e')
+
+m = ExprMem(a)
+s = a[:8]
+
+i1 = ExprInt(uint32(0x1))
+i2 = ExprInt(uint32(0x2))
+cc = ExprCond(a, b, c)
+
+o = ExprCompose([(a[:8], 8, 16),
+                 (a[8:16], 0, 8)])
+
+o2 = ExprCompose([(a[8:16], 0, 8),
+                 (a[:8], 8, 16)])
+
+l = [a[:8], b[:8], c[:8], m[:8], s, i1[:8], i2[:8], o[:8]]
+l2 = l[::-1]
+
+
+x = ExprMem(a + b + ExprInt32(0x42))
+
+
+def replace_expr(e):
+    # print 'visit', e
+    dct = {c + ExprInt32(0x42): 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], 0, 8), (b[:16], 8, 24), (x[:8], 24, 32)])
+print z
+print z.copy()
+print z[:31].copy().visit(replace_expr)
+
+print 'replace'
+print x.replace_expr({c + ExprInt32(0x42): d,
+                      a + b: c, })
+print z.replace_expr({c + ExprInt32(0x42): d,
+                      a + b: c, })
+
+
+u = z.copy()
+print u