[llvm.py] Implement disassembler interface

It doesn't currently support the op info and symbol lookup callbacks,
but it is better than nothing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152527 91177308-0d34-0410-b5e6-96231b3b80d8

bindings/python/llvm/tests/test_disassembler.py

@@ -0,0 +1,28 @@
+from .base import TestBase
+
+from ..disassembler import Disassembler
+
+class TestDisassembler(TestBase):
+    def test_instantiate(self):
+         Disassembler('i686-apple-darwin9')
+
+    def test_basic(self):
+        sequence = '\x67\xe3\x81' # jcxz -127
+        triple = 'i686-apple-darwin9'
+
+        disassembler = Disassembler(triple)
+
+        count, s = disassembler.get_instruction(sequence)
+        self.assertEqual(count, 3)
+        self.assertEqual(s, '\tjcxz\t-127')
+
+    def test_get_instructions(self):
+        sequence = '\x67\xe3\x81\x01\xc7' # jcxz -127; addl %eax, %edi
+
+        disassembler = Disassembler('i686-apple-darwin9')
+
+        instructions = list(disassembler.get_instructions(sequence))
+        self.assertEqual(len(instructions), 2)
+
+        self.assertEqual(instructions[0], (0, 3, '\tjcxz\t-127'))
+        self.assertEqual(instructions[1], (3, 2, '\taddl\t%eax, %edi'))