2c4226f8ac
This patch adds support for the _M and _m gdb-remote packets, which (de)allocate memory in the inferior. This works by "injecting" a m(un)map syscall into the inferior. This consists of: - finding an executable page of memory - writing the syscall opcode to it - setting up registers according to the os syscall convention - single stepping over the syscall The advantage of this approach over calling the mmap function is that this works even in case the mmap function is buggy or unavailable. The disadvantage is it is more platform-dependent, which is why this patch only works on X86 (_32 and _64) right now. Adding support for other linux architectures should be easy and consist of defining the appropriate syscall constants. Adding support for other OSes depends on the its ability to do a similar trick. Differential Revision: https://reviews.llvm.org/D89124
297 lines
12 KiB
Python
297 lines
12 KiB
Python
"""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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mydir = TestBase.compute_mydir(__file__)
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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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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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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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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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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(
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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(
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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(
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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(
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new_stop_id > old_stop_id,
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"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(
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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.assertTrue(
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current_line == frame.GetLineEntry().GetLine(),
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"The line stayed the same after expression.")
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self.assertTrue(
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current_file == frame.GetLineEntry().GetFileSpec(),
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"The file stayed the same after expression.")
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self.assertTrue(
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thread.GetStopReason() == lldb.eStopReasonBreakpoint,
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"We still say we stopped for a breakpoint.")
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self.assertTrue(thread.GetStopReasonDataAtIndex(0) == current_bp[
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0] and thread.GetStopReasonDataAtIndex(1) == current_bp[1], "And it is the same breakpoint.")
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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.assertTrue(
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stop_id_before_expression == stop_id_after_expression,
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"Expression calling doesn't change stop ID")
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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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# 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.assertTrue(
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current_line == frame.GetLineEntry().GetLine(),
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"The line stayed the same after expression.")
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self.assertTrue(
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current_file == frame.GetLineEntry().GetFileSpec(),
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"The file stayed the same after expression.")
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self.assertTrue(
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thread.GetStopReason() == lldb.eStopReasonBreakpoint,
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"We still say we stopped for a breakpoint.")
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self.assertTrue(thread.GetStopReasonDataAtIndex(0) == current_bp[
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0] and thread.GetStopReasonDataAtIndex(1) == current_bp[1], "And it is the same breakpoint.")
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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.assertTrue(thread.GetFrameAtIndex(0).GetFunctionName() == "a")
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self.assertTrue(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.assertTrue(thread.GetFrameAtIndex(0).GetFunctionName() == "main")
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self.assertTrue(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(
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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.assertTrue(
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func_name == "b",
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"Should be in 'b', were in %s" %
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(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.assertTrue(thread.GetFrameAtIndex(
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0).GetLineEntry().GetLine() == current_line)
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self.assertTrue(thread.GetFrameAtIndex(
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0).GetLineEntry().GetFileSpec() == current_file)
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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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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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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.', self.main_source_spec)
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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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self.assertTrue(break_before_complex_4, VALID_BREAKPOINT)
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threads = lldbutil.continue_to_breakpoint(
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process, break_before_complex_1)
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self.assertTrue(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.assertTrue(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(
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process, break_before_complex_2)
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self.assertTrue(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.assertTrue(thread.GetFrameAtIndex(
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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(
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process, break_before_complex_3)
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self.assertTrue(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(
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process, lldb.eStopReasonBreakpoint)
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self.assertTrue(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(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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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.assertTrue(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(
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process, break_before_complex_4)
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self.assertTrue(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.assertTrue(thread.GetFrameAtIndex(0).GetFunctionName() == "main")
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