TestSyntheticCapping.py
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"""
Check for an issue where capping does not work because the Target pointer appears to be changing behind our backs
"""
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class SyntheticCappingTestCase(TestBase):
mydir = TestBase.compute_mydir(__file__)
def setUp(self):
# Call super's setUp().
TestBase.setUp(self)
# Find the line number to break at.
self.line = line_number('main.cpp', '// Set break point at this line.')
def test_with_run_command(self):
"""Check for an issue where capping does not work because the Target pointer appears to be changing behind our backs."""
self.build()
self.runCmd("file " + self.getBuildArtifact("a.out"), CURRENT_EXECUTABLE_SET)
lldbutil.run_break_set_by_file_and_line(
self, "main.cpp", self.line, num_expected_locations=1, loc_exact=True)
self.runCmd("run", RUN_SUCCEEDED)
process = self.dbg.GetSelectedTarget().GetProcess()
# The stop reason of the thread should be breakpoint.
self.expect("thread list", STOPPED_DUE_TO_BREAKPOINT,
substrs=['stopped',
'stop reason = breakpoint'])
# This is the function to remove the custom formats in order to have a
# clean slate for the next test case.
def cleanup():
self.runCmd('type format clear', check=False)
self.runCmd('type summary clear', check=False)
self.runCmd('type filter clear', check=False)
self.runCmd('type synth clear', check=False)
self.runCmd(
"settings set target.max-children-count 256",
check=False)
# Execute the cleanup function during test case tear down.
self.addTearDownHook(cleanup)
# set up the synthetic children provider
self.runCmd("script from fooSynthProvider import *")
self.runCmd("type synth add -l fooSynthProvider foo")
# note that the value of fake_a depends on target byte order
if process.GetByteOrder() == lldb.eByteOrderLittle:
fake_a_val = 0x02000000
else:
fake_a_val = 0x00000100
# check that the synthetic children work, so we know we are doing the
# right thing
self.expect(
"frame variable f00_1",
substrs=[
'a = 1',
'fake_a = %d' % fake_a_val,
'r = 34',
])
# check that capping works
self.runCmd("settings set target.max-children-count 2", check=False)
self.expect("frame variable f00_1",
substrs=[
'a = 1',
'fake_a = %d' % fake_a_val,
'...',
])
self.expect("frame variable f00_1", matching=False,
substrs=['r = 34'])
self.runCmd("settings set target.max-children-count 256", check=False)
self.expect("frame variable f00_1", matching=True,
substrs=['r = 34'])