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"""
Test C++ virtual function and virtual inheritance.
"""
from __future__ import print_function
import os
import time
import re
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
def Msg(expr, val):
return "'expression %s' matches the output (from compiled code): %s" % (
expr, val)
class CppVirtualMadness(TestBase):
mydir = TestBase.compute_mydir(__file__)
# This is the pattern by design to match the "my_expr = 'value'" output from
# printf() stmts (see main.cpp).
pattern = re.compile("^([^=]*) = '([^=]*)'$")
def setUp(self):
# Call super's setUp().
TestBase.setUp(self)
# Find the line number to break for main.cpp.
self.source = 'main.cpp'
self.line = line_number(self.source, '// Set first breakpoint here.')
@expectedFailureAll(
compiler="icc",
bugnumber="llvm.org/pr16808 lldb does not call the correct virtual function with icc.")
def test_virtual_madness(self):
"""Test that expression works correctly with virtual inheritance as well as virtual function."""
self.build()
# Bring the program to the point where we can issue a series of
# 'expression' command to compare against the golden output.
self.dbg.SetAsync(False)
# Create a target by the debugger.
target = self.dbg.CreateTarget("a.out")
self.assertTrue(target, VALID_TARGET)
# Create the breakpoint inside function 'main'.
breakpoint = target.BreakpointCreateByLocation(self.source, self.line)
self.assertTrue(breakpoint, VALID_BREAKPOINT)
# Now launch the process, and do not stop at entry point.
process = target.LaunchSimple(
None, None, self.get_process_working_directory())
self.assertTrue(process, PROCESS_IS_VALID)
self.assertTrue(process.GetState() == lldb.eStateStopped)
thread = lldbutil.get_stopped_thread(
process, lldb.eStopReasonBreakpoint)
self.assertTrue(
thread.IsValid(),
"There should be a thread stopped due to breakpoint condition")
# First, capture the golden output from the program itself.
golden = thread.GetFrameAtIndex(0).FindVariable("golden")
self.assertTrue(
golden.IsValid(),
"Encountered an error reading the process's golden variable")
error = lldb.SBError()
golden_str = process.ReadCStringFromMemory(
golden.AddressOf().GetValueAsUnsigned(), 4096, error)
self.assertTrue(error.Success())
self.assertTrue("c_as_C" in golden_str)
# This golden list contains a list of "my_expr = 'value' pairs extracted
# from the golden output.
gl = []
# Scan the golden output line by line, looking for the pattern:
#
# my_expr = 'value'
#
for line in golden_str.split(os.linesep):
match = self.pattern.search(line)
if match:
my_expr, val = match.group(1), match.group(2)
gl.append((my_expr, val))
#print("golden list:", gl)
# Now iterate through the golden list, comparing against the output from
# 'expression var'.
for my_expr, val in gl:
self.runCmd("expression %s" % my_expr)
output = self.res.GetOutput()
# The expression output must match the oracle.
self.expect(output, Msg(my_expr, val), exe=False,
substrs=[val])
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