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"""
Tests basic UndefinedBehaviorSanitizer support (detecting an alignment error).
"""
import os
import time
import lldb
from lldbsuite.test.lldbtest import *
from lldbsuite.test.decorators import *
import lldbsuite.test.lldbutil as lldbutil
import json
class UbsanBasicTestCase(TestBase):
mydir = TestBase.compute_mydir(__file__)
@skipUnlessUndefinedBehaviorSanitizer
def test(self):
self.build()
self.ubsan_tests()
def setUp(self):
# Call super's setUp().
TestBase.setUp(self)
self.line_align = line_number('main.c', '// align line')
def ubsan_tests(self):
# Load the test
exe = self.getBuildArtifact("a.out")
self.expect(
"file " + exe,
patterns=["Current executable set to .*a.out"])
self.runCmd("run")
process = self.dbg.GetSelectedTarget().process
thread = process.GetSelectedThread()
frame = thread.GetSelectedFrame()
# the stop reason of the thread should be breakpoint.
self.expect("thread list", "A ubsan issue should be detected",
substrs=['stopped', 'stop reason ='])
stop_reason = thread.GetStopReason()
self.assertEqual(stop_reason, lldb.eStopReasonInstrumentation)
# test that the UBSan dylib is present
self.expect(
"image lookup -n __ubsan_on_report",
"__ubsan_on_report should be present",
substrs=['1 match found'])
# We should be stopped in __ubsan_on_report
self.assertTrue("__ubsan_on_report" in frame.GetFunctionName())
# The stopped thread backtrace should contain either 'align line'
found = False
for i in range(thread.GetNumFrames()):
frame = thread.GetFrameAtIndex(i)
if frame.GetLineEntry().GetFileSpec().GetFilename() == "main.c":
if frame.GetLineEntry().GetLine() == self.line_align:
found = True
self.assertTrue(found)
backtraces = thread.GetStopReasonExtendedBacktraces(
lldb.eInstrumentationRuntimeTypeUndefinedBehaviorSanitizer)
self.assertTrue(backtraces.GetSize() == 1)
self.expect(
"thread info -s",
"The extended stop info should contain the UBSan provided fields",
substrs=[
"instrumentation_class",
"memory_address",
"description",
"filename",
"line",
"col"])
output_lines = self.res.GetOutput().split('\n')
json_line = '\n'.join(output_lines[2:])
data = json.loads(json_line)
self.assertEqual(data["instrumentation_class"], "UndefinedBehaviorSanitizer")
self.assertEqual(data["description"], "misaligned-pointer-use")
self.assertEqual(os.path.basename(data["filename"]), "main.c")
self.assertEqual(data["line"], self.line_align)
self.runCmd("continue")
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