[lldb-dev] [Bug 15260] New: lldb on Linux does not display the correct value of bit fields

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Wed Feb 13 16:06:50 PST 2013


            Bug ID: 15260
           Summary: lldb on Linux does not display the correct value of
                    bit fields
           Product: lldb
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at cs.uiuc.edu
          Reporter: daniel.malea at intel.com
    Classification: Unclassified

The testcase TestBitfields.py fails because a single bit is not displayed
correctly in a structure that uses bit masks. Interestingly, the other members
of the struct (before and after the 1-bit member) seem to be displayed

To reproduce with clang on an x86_64 linux build, run:

python dotest.py lang/c/bitfields

The trace of the failure is below:

runCmd: frame variable --show-types more_bits
output: (MoreBits) more_bits = { 
  (uint32_t:3) a = 3 
  (int:1)  = -1
  (uint8_t:1) b = '\0'
  (uint8_t:1) c = '\x01'
  (uint8_t:1) d = '\0'

Expecting sub string: (uint32_t:3) a = 3 

Expecting sub string: (int:1)  = 0 
Not matched


Traceback (most recent call last):
  File "/home/daniel/dev/llvm-svn/tools/lldb/test/lldbtest.py", line 365, in
    return func(self, *args, **kwargs)
line 32, in test_with_dwarf_and_run_command
line 111, in bitfields_variable
    '(uint8_t:1) d = \'\\0\''])
  File "/home/daniel/dev/llvm-svn/tools/lldb/test/lldbtest.py", line 1325, in
    msg if msg else EXP_MSG(str, exe))
AssertionError: False is not True : Variable(s) displayed correctly

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