python: make _decode_table_types aware of __int128

There are no ctypes types ready for int128. However, recognizing this
type and representing it as an array is better than simply erroring out.

* Add mapping between (unsigned) __128 C types declaration and ctypes
  parsing
* Add simple test case in test_clang to recognisze and use such types
* Fixes deprecation warnings about self.assertEquals in 2 other test
  cases.

src/python/bcc/__init__.py

@@ -378,7 +378,9 @@ class BPF(object):
         u"unsigned long long": ct.c_ulonglong,
         u"float": ct.c_float,
         u"double": ct.c_double,
-        u"long double": ct.c_longdouble
+        u"long double": ct.c_longdouble,
+        u"__int128": ct.c_int64 * 2,
+        u"unsigned __int128": ct.c_uint64 * 2,
     }
     @staticmethod
     def _decode_table_type(desc):

tests/python/test_clang.py

@@ -7,6 +7,8 @@ import ctypes as ct
 from unittest import main, skipUnless, TestCase
 import os
 import sys
+import socket
+import struct
 from contextlib import contextmanager
 import distutils.version
 
@@ -439,7 +441,7 @@ int process(struct xdp_md *ctx) {
         """
         b = BPF(text=text)
         t = b["jmp"]
-        self.assertEquals(len(t), 32);
+        self.assertEqual(len(t), 32);
 
     def test_update_macro_arg(self):
         text = """
@@ -459,7 +461,7 @@ int process(struct xdp_md *ctx) {
         """
         b = BPF(text=text)
         t = b["act"]
-        self.assertEquals(len(t), 32);
+        self.assertEqual(len(t), 32);
 
     def test_ext_ptr_maps(self):
         bpf_text = """
@@ -654,6 +656,25 @@ BPF_HASH(drops, struct a);
         """
         b = BPF(text=text)
 
+    def test_int128_types(self):
+        text = """
+BPF_HASH(table1, unsigned __int128, __int128);
+"""
+        b = BPF(text=text)
+        table = b['table1']
+        self.assertEqual(ct.sizeof(table.Key), 16)
+        self.assertEqual(ct.sizeof(table.Leaf), 16)
+        table[
+            table.Key.from_buffer_copy(
+                socket.inet_pton(socket.AF_INET6, "2001:db8::"))
+        ] = table.Leaf.from_buffer_copy(struct.pack('LL', 42, 123456789))
+        for k, v in table.items():
+            self.assertEqual(v[0], 42)
+            self.assertEqual(v[1], 123456789)
+            self.assertEqual(socket.inet_ntop(socket.AF_INET6,
+                                              struct.pack('LL', k[0], k[1])),
+                             "2001:db8::")
+
 
 if __name__ == "__main__":
     main()