311 lines
12 KiB
Python
311 lines
12 KiB
Python
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"""Test stepping over vrs. hitting breakpoints & subsequent stepping in various forms."""
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import lldb
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from lldbsuite.test.decorators import *
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from lldbsuite.test.lldbtest import *
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from lldbsuite.test import lldbutil
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class TestCStepping(TestBase):
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def setUp(self):
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# Call super's setUp().
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TestBase.setUp(self)
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# Find the line numbers that we will step to in main:
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self.main_source = "main.c"
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@add_test_categories(["pyapi", "basic_process"])
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@expectedFailureAll(oslist=["freebsd"], bugnumber="llvm.org/pr17932")
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@expectedFailureAll(oslist=["linux"], archs=no_match(["i386", "x86_64"]))
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@expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24777")
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@expectedFailureNetBSD
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def test_and_python_api(self):
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"""Test stepping over vrs. hitting breakpoints & subsequent stepping in various forms."""
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self.build()
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exe = self.getBuildArtifact("a.out")
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target = self.dbg.CreateTarget(exe)
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self.assertTrue(target, VALID_TARGET)
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self.main_source_spec = lldb.SBFileSpec(self.main_source)
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breakpoints_to_disable = []
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break_1_in_main = target.BreakpointCreateBySourceRegex(
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"// frame select 2, thread step-out while stopped at .c.1..",
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self.main_source_spec,
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)
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self.assertTrue(break_1_in_main, VALID_BREAKPOINT)
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breakpoints_to_disable.append(break_1_in_main)
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break_in_a = target.BreakpointCreateBySourceRegex(
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"// break here to stop in a before calling b", self.main_source_spec
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)
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self.assertTrue(break_in_a, VALID_BREAKPOINT)
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breakpoints_to_disable.append(break_in_a)
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break_in_b = target.BreakpointCreateBySourceRegex(
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"// thread step-out while stopped at .c.2..", self.main_source_spec
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)
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self.assertTrue(break_in_b, VALID_BREAKPOINT)
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breakpoints_to_disable.append(break_in_b)
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break_in_c = target.BreakpointCreateBySourceRegex(
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"// Find the line number of function .c. here.", self.main_source_spec
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)
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self.assertTrue(break_in_c, VALID_BREAKPOINT)
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breakpoints_to_disable.append(break_in_c)
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# Now launch the process, and do not stop at entry point.
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process = target.LaunchSimple(None, None, self.get_process_working_directory())
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self.assertTrue(process, PROCESS_IS_VALID)
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# The stop reason of the thread should be breakpoint.
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threads = lldbutil.get_threads_stopped_at_breakpoint(process, break_1_in_main)
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if len(threads) != 1:
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self.fail("Failed to stop at first breakpoint in main.")
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thread = threads[0]
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# Get the stop id and for fun make sure it increases:
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old_stop_id = process.GetStopID()
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# Now step over, which should cause us to hit the breakpoint in "a"
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thread.StepOver()
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# The stop reason of the thread should be breakpoint.
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threads = lldbutil.get_threads_stopped_at_breakpoint(process, break_in_a)
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if len(threads) != 1:
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self.fail("Failed to stop at breakpoint in a.")
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# Check that the stop ID increases:
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new_stop_id = process.GetStopID()
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self.assertTrue(new_stop_id > old_stop_id, "Stop ID increases monotonically.")
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thread = threads[0]
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# Step over, and we should hit the breakpoint in b:
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thread.StepOver()
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threads = lldbutil.get_threads_stopped_at_breakpoint(process, break_in_b)
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if len(threads) != 1:
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self.fail("Failed to stop at breakpoint in b.")
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thread = threads[0]
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# Now try running some function, and make sure that we still end up in the same place
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# and with the same stop reason.
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frame = thread.GetFrameAtIndex(0)
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current_line = frame.GetLineEntry().GetLine()
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current_file = frame.GetLineEntry().GetFileSpec()
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current_bp = []
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current_bp.append(thread.GetStopReasonDataAtIndex(0))
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current_bp.append(thread.GetStopReasonDataAtIndex(1))
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stop_id_before_expression = process.GetStopID()
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stop_id_before_including_expressions = process.GetStopID(True)
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frame.EvaluateExpression("(int) printf (print_string)")
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frame = thread.GetFrameAtIndex(0)
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self.assertEqual(
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current_line,
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frame.GetLineEntry().GetLine(),
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"The line stayed the same after expression.",
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)
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self.assertEqual(
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current_file,
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frame.GetLineEntry().GetFileSpec(),
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"The file stayed the same after expression.",
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)
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self.assertEqual(
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thread.GetStopReason(),
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lldb.eStopReasonBreakpoint,
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"We still say we stopped for a breakpoint.",
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)
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self.assertTrue(
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thread.GetStopReasonDataAtIndex(0) == current_bp[0]
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and thread.GetStopReasonDataAtIndex(1) == current_bp[1],
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"And it is the same breakpoint.",
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)
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# Also make sure running the expression didn't change the public stop id
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# but did change if we are asking for expression stops as well.
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stop_id_after_expression = process.GetStopID()
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stop_id_after_including_expressions = process.GetStopID(True)
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self.assertEqual(
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stop_id_before_expression,
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stop_id_after_expression,
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"Expression calling doesn't change stop ID",
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)
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self.assertTrue(
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stop_id_after_including_expressions > stop_id_before_including_expressions,
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"Stop ID including expressions increments over expression call.",
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)
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# Do the same thing with an expression that's going to crash, and make
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# sure we are still unchanged.
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frame.EvaluateExpression("((char *) 0)[0] = 'a'")
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frame = thread.GetFrameAtIndex(0)
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self.assertEqual(
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current_line,
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frame.GetLineEntry().GetLine(),
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"The line stayed the same after expression.",
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)
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self.assertEqual(
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current_file,
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frame.GetLineEntry().GetFileSpec(),
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"The file stayed the same after expression.",
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)
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self.assertEqual(
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thread.GetStopReason(),
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lldb.eStopReasonBreakpoint,
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"We still say we stopped for a breakpoint.",
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)
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self.assertTrue(
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thread.GetStopReasonDataAtIndex(0) == current_bp[0]
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and thread.GetStopReasonDataAtIndex(1) == current_bp[1],
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"And it is the same breakpoint.",
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)
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# Now continue and make sure we just complete the step:
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# Disable all our breakpoints first - sometimes the compiler puts two line table entries in for the
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# breakpoint a "b" and we don't want to hit that.
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for bkpt in breakpoints_to_disable:
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bkpt.SetEnabled(False)
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process.Continue()
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self.assertEqual(thread.GetFrameAtIndex(0).GetFunctionName(), "a")
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self.assertStopReason(thread.GetStopReason(), lldb.eStopReasonPlanComplete)
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# And one more time should get us back to main:
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process.Continue()
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self.assertEqual(thread.GetFrameAtIndex(0).GetFunctionName(), "main")
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self.assertStopReason(thread.GetStopReason(), lldb.eStopReasonPlanComplete)
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# Now make sure we can call a function, break in the called function,
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# then have "continue" get us back out again:
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frame = thread.GetFrameAtIndex(0)
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frame = thread.GetFrameAtIndex(0)
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current_line = frame.GetLineEntry().GetLine()
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current_file = frame.GetLineEntry().GetFileSpec()
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break_in_b.SetEnabled(True)
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options = lldb.SBExpressionOptions()
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options.SetIgnoreBreakpoints(False)
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options.SetFetchDynamicValue(False)
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options.SetUnwindOnError(False)
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frame.EvaluateExpression("b (4)", options)
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threads = lldbutil.get_threads_stopped_at_breakpoint(process, break_in_b)
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if len(threads) != 1:
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self.fail("Failed to stop at breakpoint in b when calling b.")
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thread = threads[0]
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# So do a step over here to make sure we can still do that:
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thread.StepOver()
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# See that we are still in b:
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func_name = thread.GetFrameAtIndex(0).GetFunctionName()
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self.assertEqual(func_name, "b", "Should be in 'b', were in %s" % (func_name))
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# Okay, now if we continue, we will finish off our function call and we
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# should end up back in "a" as if nothing had happened:
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process.Continue()
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self.assertEqual(
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thread.GetFrameAtIndex(0).GetLineEntry().GetLine(), current_line
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)
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self.assertEqual(
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thread.GetFrameAtIndex(0).GetLineEntry().GetFileSpec(), current_file
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)
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# Now we are going to test step in targeting a function:
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break_in_b.SetEnabled(False)
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break_before_complex_1 = target.BreakpointCreateBySourceRegex(
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"// Stop here to try step in targeting b.", self.main_source_spec
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)
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self.assertTrue(break_before_complex_1, VALID_BREAKPOINT)
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break_before_complex_2 = target.BreakpointCreateBySourceRegex(
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"// Stop here to try step in targeting complex.", self.main_source_spec
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)
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self.assertTrue(break_before_complex_2, VALID_BREAKPOINT)
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break_before_complex_3 = target.BreakpointCreateBySourceRegex(
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"// Stop here to step targeting b and hitting breakpoint.",
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self.main_source_spec,
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)
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self.assertTrue(break_before_complex_3, VALID_BREAKPOINT)
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break_before_complex_4 = target.BreakpointCreateBySourceRegex(
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"// Stop here to make sure bogus target steps over.", self.main_source_spec
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)
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self.assertTrue(break_before_complex_4, VALID_BREAKPOINT)
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threads = lldbutil.continue_to_breakpoint(process, break_before_complex_1)
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self.assertEqual(len(threads), 1)
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thread = threads[0]
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break_before_complex_1.SetEnabled(False)
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thread.StepInto("b")
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self.assertEqual(thread.GetFrameAtIndex(0).GetFunctionName(), "b")
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# Now continue out and stop at the next call to complex. This time
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# step all the way into complex:
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threads = lldbutil.continue_to_breakpoint(process, break_before_complex_2)
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self.assertEqual(len(threads), 1)
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thread = threads[0]
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break_before_complex_2.SetEnabled(False)
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thread.StepInto("complex")
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self.assertEqual(thread.GetFrameAtIndex(0).GetFunctionName(), "complex")
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# Now continue out and stop at the next call to complex. This time
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# enable breakpoints in a and c and then step targeting b:
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threads = lldbutil.continue_to_breakpoint(process, break_before_complex_3)
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self.assertEqual(len(threads), 1)
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thread = threads[0]
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break_before_complex_3.SetEnabled(False)
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break_at_start_of_a = target.BreakpointCreateByName("a")
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break_at_start_of_c = target.BreakpointCreateByName("c")
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thread.StepInto("b")
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threads = lldbutil.get_stopped_threads(process, lldb.eStopReasonBreakpoint)
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self.assertEqual(len(threads), 1)
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thread = threads[0]
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stop_break_id = thread.GetStopReasonDataAtIndex(0)
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self.assertTrue(
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stop_break_id == break_at_start_of_a.GetID()
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or stop_break_id == break_at_start_of_c.GetID()
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)
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break_at_start_of_a.SetEnabled(False)
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break_at_start_of_c.SetEnabled(False)
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process.Continue()
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self.assertEqual(thread.GetFrameAtIndex(0).GetFunctionName(), "b")
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# Now continue out and stop at the next call to complex. This time
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# enable breakpoints in a and c and then step targeting b:
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threads = lldbutil.continue_to_breakpoint(process, break_before_complex_4)
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self.assertEqual(len(threads), 1)
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thread = threads[0]
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break_before_complex_4.SetEnabled(False)
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thread.StepInto("NoSuchFunction")
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self.assertEqual(thread.GetFrameAtIndex(0).GetFunctionName(), "main")
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