Add int hook to Python3

Fixes #120

pwndbg/inthook.py

@@ -18,28 +18,30 @@ import pwndbg.typeinfo
 
 if sys.version_info < (3,0):
     import __builtin__ as builtins
-    _int = builtins.int
-
-    # We need this class to get isinstance(7, xint) to return True
-    class IsAnInt(type):
-        def __instancecheck__(self, other):
-            return isinstance(other, _int)
-
-    class xint(builtins.int):
-        __metaclass__ = IsAnInt
-        def __new__(cls, value, *a, **kw):
-            if isinstance(value, gdb.Value):
-                if pwndbg.typeinfo.is_pointer(value):
-                    value = value.cast(pwndbg.typeinfo.ulong)
-                else:
-                    value = value.cast(pwndbg.typeinfo.long)
-            return _int(_int(value, *a, **kw))
-
-    builtins.int = xint
-    globals()['int'] = xint
-
-    # Additionally, we need to compensate for Python2
 else:
     import builtins
-    builtins.long = int
-    globals()['long'] = int
+
+_int = builtins.int
+
+# We need this class to get isinstance(7, xint) to return True
+class IsAnInt(type):
+    def __instancecheck__(self, other):
+        return isinstance(other, _int)
+
+class xint(builtins.int):
+    __metaclass__ = IsAnInt
+    def __new__(cls, value, *a, **kw):
+        if isinstance(value, gdb.Value):
+            if pwndbg.typeinfo.is_pointer(value):
+                value = value.cast(pwndbg.typeinfo.ulong)
+            else:
+                value = value.cast(pwndbg.typeinfo.long)
+        return _int(_int(value, *a, **kw))
+
+builtins.int = xint
+globals()['int'] = xint
+
+if sys.version_info >= (3,0):
+    builtins.long = xint
+    globals()['long'] = xint
+