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"""
Test lldb Python API SBValue::Cast(SBType) for C++ types.
"""
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class CppValueCastTestCase(TestBase):
@skipIf(bugnumber="llvm.org/PR36714")
@add_test_categories(['pyapi'])
def test_value_cast_with_virtual_inheritance(self):
"""Test SBValue::Cast(SBType) API for C++ types with virtual inheritance."""
self.build(dictionary=self.d_virtual)
self.setTearDownCleanup(dictionary=self.d_virtual)
self.do_sbvalue_cast(self.exe_name)
@add_test_categories(['pyapi'])
def test_value_cast_with_regular_inheritance(self):
"""Test SBValue::Cast(SBType) API for C++ types with regular inheritance."""
self.build(dictionary=self.d_regular)
self.setTearDownCleanup(dictionary=self.d_regular)
self.do_sbvalue_cast(self.exe_name)
def setUp(self):
# Call super's setUp().
TestBase.setUp(self)
# Find the line number to break for main.c.
self.source = 'sbvalue-cast.cpp'
self.line = line_number(self.source, '// Set breakpoint here.')
self.exe_name = self.testMethodName
self.d_virtual = {
'CXX_SOURCES': self.source,
'EXE': self.exe_name,
'CFLAGS_EXTRAS': '-DDO_VIRTUAL_INHERITANCE'}
self.d_regular = {'CXX_SOURCES': self.source, 'EXE': self.exe_name}
def do_sbvalue_cast(self, exe_name):
"""Test SBValue::Cast(SBType) API for C++ types."""
exe = self.getBuildArtifact(exe_name)
# Create a target from the debugger.
target = self.dbg.CreateTarget(exe)
self.assertTrue(target, VALID_TARGET)
# Set up our breakpoints:
breakpoint = target.BreakpointCreateByLocation(self.source, self.line)
self.assertTrue(breakpoint, VALID_BREAKPOINT)
# Now launch the process, and do not stop at the entry point.
process = target.LaunchSimple(
None, None, self.get_process_working_directory())
self.assertState(process.GetState(), lldb.eStateStopped,
PROCESS_STOPPED)
# Find DerivedA and DerivedB types.
typeA = target.FindFirstType('DerivedA')
typeB = target.FindFirstType('DerivedB')
self.DebugSBType(typeA)
self.DebugSBType(typeB)
self.assertTrue(typeA)
self.assertTrue(typeB)
error = lldb.SBError()
# First stop is for DerivedA instance.
threads = lldbutil.get_threads_stopped_at_breakpoint(
process, breakpoint)
self.assertEqual(len(threads), 1)
thread = threads[0]
frame0 = thread.GetFrameAtIndex(0)
tellerA = frame0.FindVariable('teller', lldb.eNoDynamicValues)
self.DebugSBValue(tellerA)
self.assertEqual(
tellerA.GetChildMemberWithName('m_base_val').GetValueAsUnsigned(error, 0), 20)
if self.TraceOn():
for child in tellerA:
print("child name:", child.GetName())
print(child)
# Call SBValue.Cast() to obtain instanceA.
instanceA = tellerA.Cast(typeA.GetPointerType())
self.DebugSBValue(instanceA)
# Iterate through all the children and print their values.
if self.TraceOn():
for child in instanceA:
print("child name:", child.GetName())
print(child)
a_member_val = instanceA.GetChildMemberWithName('m_a_val')
self.DebugSBValue(a_member_val)
self.assertEqual(a_member_val.GetValueAsUnsigned(error, 0), 10)
# Second stop is for DerivedB instance.
threads = lldbutil.continue_to_breakpoint(process, breakpoint)
self.assertEqual(len(threads), 1)
thread = threads[0]
frame0 = thread.GetFrameAtIndex(0)
tellerB = frame0.FindVariable('teller', lldb.eNoDynamicValues)
self.DebugSBValue(tellerB)
self.assertEqual(
tellerB.GetChildMemberWithName('m_base_val').GetValueAsUnsigned(error, 0), 12)
if self.TraceOn():
for child in tellerB:
print("child name:", child.GetName())
print(child)
# Call SBValue.Cast() to obtain instanceB.
instanceB = tellerB.Cast(typeB.GetPointerType())
self.DebugSBValue(instanceB)
# Iterate through all the children and print their values.
if self.TraceOn():
for child in instanceB:
print("child name:", child.GetName())
print(child)
b_member_val = instanceB.GetChildMemberWithName('m_b_val')
self.DebugSBValue(b_member_val)
self.assertEqual(b_member_val.GetValueAsUnsigned(error, 0), 36)
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