[Lldb-commits] [PATCH] D43532: Fix TestSBData.py on Windows (which uses Python 3)

Adrian McCarthy via Phabricator via lldb-commits lldb-commits at lists.llvm.org
Tue Feb 20 15:18:59 PST 2018

amccarth created this revision.
amccarth added a reviewer: zturner.
Herald added a subscriber: sanjoy.

This test uses the SB API to set and read back bytes of data, and it works fine when Python 2 is the scripting language.  On Windows, however, Python 3 is the default.

Note this line from the test:

  addr_data = '\x11\x22\x33\x44\x55\x66\x77\x88'

The intent here is to create an array of eight bytes as a string literal.  This works in Python 2, but Python 3 treats those as a series Unicode code points, and the CPython implementation happens to encode those code points as UTF-8.  The first seven characters encode directly as single bytes of the same value.  But the UTF-8 encoding of 0x88 is two bytes long:  0xC2 0x88.  So the input array doesn't have the intended data at the end, so the test cases that use all eight bytes fail.

Adding the `b` prefix tells Python 3 that we want a byte array rather than a string.  With this change, the test now passes on Windows.  I believe this also works for Python 2 (Python 2.7 accepts the b-prefix and seems to do the right thing), but I'm not very familiar with the details of Python 2.



Index: lldb/packages/Python/lldbsuite/test/python_api/sbdata/TestSBData.py
--- lldb/packages/Python/lldbsuite/test/python_api/sbdata/TestSBData.py
+++ lldb/packages/Python/lldbsuite/test/python_api/sbdata/TestSBData.py
@@ -25,7 +25,7 @@
     def test_byte_order_and_address_byte_size(self):
         """Test the SBData::SetData() to ensure the byte order and address 
         byte size are obeyed"""
-        addr_data = '\x11\x22\x33\x44\x55\x66\x77\x88'
+        addr_data = b'\x11\x22\x33\x44\x55\x66\x77\x88'
         error = lldb.SBError()
         data = lldb.SBData()
         data.SetData(error, addr_data, lldb.eByteOrderBig, 4)

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