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# encoding: utf-8
"""
Test lldb Obj-C exception support.
"""
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class ObjCExceptionsTestCase(TestBase):
@skipIf(compiler="clang", compiler_version=["<", "13.0"])
def test_objc_exceptions_at_throw(self):
self.build()
target = self.dbg.CreateTarget(self.getBuildArtifact("a.out"))
self.assertTrue(target, VALID_TARGET)
launch_info = lldb.SBLaunchInfo(["a.out", "0"])
launch_info.SetLaunchFlags(lldb.eLaunchFlagInheritTCCFromParent)
lldbutil.run_to_name_breakpoint(
self, "objc_exception_throw", launch_info=launch_info
)
self.expect(
"thread list",
substrs=["stopped", "stop reason = hit Objective-C exception"],
)
self.expect(
"thread exception",
substrs=[
"(NSException *) exception = ",
'"SomeReason"',
],
)
target = self.dbg.GetSelectedTarget()
thread = target.GetProcess().GetSelectedThread()
frame = thread.GetSelectedFrame()
opts = lldb.SBVariablesOptions()
opts.SetIncludeRecognizedArguments(True)
variables = frame.GetVariables(opts)
self.assertEqual(variables.GetSize(), 1)
self.assertEqual(variables.GetValueAtIndex(0).name, "exception")
self.assertEqual(
variables.GetValueAtIndex(0).GetValueType(), lldb.eValueTypeVariableArgument
)
lldbutil.run_to_source_breakpoint(
self,
"// Set break point at this line.",
lldb.SBFileSpec("main.mm"),
launch_info=launch_info,
)
self.expect(
"thread list",
STOPPED_DUE_TO_BREAKPOINT,
substrs=["stopped", "stop reason = breakpoint"],
)
target = self.dbg.GetSelectedTarget()
thread = target.GetProcess().GetSelectedThread()
frame = thread.GetSelectedFrame()
# No exception being currently thrown/caught at this point
self.assertFalse(thread.GetCurrentException().IsValid())
self.assertFalse(thread.GetCurrentExceptionBacktrace().IsValid())
self.expect(
"frame variable e1", substrs=["(NSException *) e1 = ", '"SomeReason"']
)
self.expect(
"frame variable *e1",
substrs=[
"(NSException) *e1 = ",
"name = ",
'"ExceptionName"',
"reason = ",
'"SomeReason"',
"userInfo = ",
"1 key/value pair",
"reserved = ",
],
)
e1 = frame.FindVariable("e1")
self.assertTrue(e1)
self.assertEqual(e1.type.name, "NSException *")
self.assertEqual(e1.GetSummary(), '"SomeReason"')
self.assertEqual(e1.GetChildMemberWithName("name").description, "ExceptionName")
self.assertEqual(e1.GetChildMemberWithName("reason").description, "SomeReason")
userInfo = e1.GetChildMemberWithName("userInfo").dynamic
self.assertEqual(userInfo.summary, "1 key/value pair")
self.assertEqual(
userInfo.GetChildAtIndex(0).GetChildAtIndex(0).description, "some_key"
)
self.assertEqual(
userInfo.GetChildAtIndex(0).GetChildAtIndex(1).description, "some_value"
)
self.expect(
"frame variable e2", substrs=["(NSException *) e2 = ", '"SomeReason"']
)
self.expect(
"frame variable *e2",
substrs=[
"(NSException) *e2 = ",
"name = ",
'"ThrownException"',
"reason = ",
'"SomeReason"',
"userInfo = ",
"1 key/value pair",
"reserved = ",
],
)
e2 = frame.FindVariable("e2")
self.assertTrue(e2)
self.assertEqual(e2.type.name, "NSException *")
self.assertEqual(e2.GetSummary(), '"SomeReason"')
self.assertEqual(
e2.GetChildMemberWithName("name").description, "ThrownException"
)
self.assertEqual(e2.GetChildMemberWithName("reason").description, "SomeReason")
userInfo = e2.GetChildMemberWithName("userInfo").dynamic
self.assertEqual(userInfo.summary, "1 key/value pair")
self.assertEqual(
userInfo.GetChildAtIndex(0).GetChildAtIndex(0).description, "some_key"
)
self.assertEqual(
userInfo.GetChildAtIndex(0).GetChildAtIndex(1).description, "some_value"
)
reserved = e2.GetChildMemberWithName("reserved").dynamic
self.assertGreater(reserved.num_children, 0)
callStackReturnAddresses = [
reserved.GetChildAtIndex(i).GetChildAtIndex(1)
for i in range(0, reserved.GetNumChildren())
if reserved.GetChildAtIndex(i).GetChildAtIndex(0).description
== "callStackReturnAddresses"
][0].dynamic
children = [
callStackReturnAddresses.GetChildAtIndex(i)
for i in range(0, callStackReturnAddresses.num_children)
]
pcs = [i.unsigned for i in children]
names = [
target.ResolveSymbolContextForAddress(
lldb.SBAddress(pc, target), lldb.eSymbolContextSymbol
)
.GetSymbol()
.name
for pc in pcs
]
for n in ["objc_exception_throw", "foo(int)", "main"]:
self.assertIn(
n, names, "%s is in the exception backtrace (%s)" % (n, names)
)
@skipIf(compiler="clang", compiler_version=["<", "13.0"])
def test_objc_exceptions_at_abort(self):
self.build()
target = self.dbg.CreateTarget(self.getBuildArtifact("a.out"))
self.assertTrue(target, VALID_TARGET)
self.runCmd("run 0")
# We should be stopped at pthread_kill because of an unhandled exception
self.expect("thread list", substrs=["stopped", "stop reason = signal SIGABRT"])
self.expect(
"thread exception",
substrs=[
"(NSException *) exception = ",
'"SomeReason"',
"libobjc.A.dylib`objc_exception_throw",
"a.out`foo",
"at main.mm:16",
"a.out`rethrow",
"at main.mm:27",
"a.out`main",
],
)
process = self.dbg.GetSelectedTarget().process
thread = process.GetSelectedThread()
# There is an exception being currently processed at this point
self.assertTrue(thread.GetCurrentException().IsValid())
self.assertTrue(thread.GetCurrentExceptionBacktrace().IsValid())
history_thread = thread.GetCurrentExceptionBacktrace()
self.assertGreaterEqual(history_thread.num_frames, 4)
for n in ["objc_exception_throw", "foo(int)", "rethrow(int)", "main"]:
self.assertEqual(
len([f for f in history_thread.frames if f.GetFunctionName() == n]), 1
)
self.runCmd("kill")
self.runCmd("run 1")
# We should be stopped at pthread_kill because of an unhandled exception
self.expect("thread list", substrs=["stopped", "stop reason = signal SIGABRT"])
self.expect(
"thread exception",
substrs=[
"(MyCustomException *) exception = ",
"libobjc.A.dylib`objc_exception_throw",
"a.out`foo",
"at main.mm:18",
"a.out`rethrow",
"at main.mm:27",
"a.out`main",
],
)
process = self.dbg.GetSelectedTarget().process
thread = process.GetSelectedThread()
history_thread = thread.GetCurrentExceptionBacktrace()
self.assertGreaterEqual(history_thread.num_frames, 4)
for n in ["objc_exception_throw", "foo(int)", "rethrow(int)", "main"]:
self.assertEqual(
len([f for f in history_thread.frames if f.GetFunctionName() == n]), 1
)
@skipIf(compiler="clang", compiler_version=["<", "13.0"])
def test_cxx_exceptions_at_abort(self):
self.build()
target = self.dbg.CreateTarget(self.getBuildArtifact("a.out"))
self.assertTrue(target, VALID_TARGET)
self.runCmd("run 2")
# We should be stopped at pthread_kill because of an unhandled exception
self.expect("thread list", substrs=["stopped", "stop reason = signal SIGABRT"])
self.expect("thread exception", substrs=["exception ="])
process = self.dbg.GetSelectedTarget().process
thread = process.GetSelectedThread()
self.assertTrue(thread.GetCurrentException().IsValid())
# C++ exception backtraces are not exposed in the API (yet).
self.assertFalse(thread.GetCurrentExceptionBacktrace().IsValid())
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