================
@@ -0,0 +1,79 @@
+import lldb
+import unittest
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test.decorators import *
+from lldbsuite.test.gdbclientutils import *
+from lldbsuite.test.lldbreverse import ReverseTestBase
+from lldbsuite.test import lldbutil
+
+
+class TestReverseContinueBreakpoints(ReverseTestBase):
+ @add_test_categories(["dwarf"])
+ def test_reverse_continue(self):
+ target, process, initial_threads = self.setup_recording()
+
+ # Reverse-continue. We'll stop at the point where we started recording.
+ status = process.ReverseContinue()
+ self.assertSuccess(status)
+ self.expect(
+ "thread list",
+ STOPPED_DUE_TO_HISTORY_BOUNDARY,
+ substrs=["stopped", "stop reason = history boundary"],
+ )
+
+ # Continue forward normally until the target exits.
+ status = process.Continue()
+ self.assertSuccess(status)
+ self.assertState(process.GetState(), lldb.eStateExited)
+ self.assertEqual(process.GetExitStatus(), 0)
+
+ @add_test_categories(["dwarf"])
+ def test_reverse_continue_breakpoint(self):
+ target, process, initial_threads = self.setup_recording()
+
+ # Reverse-continue to the function "trigger_breakpoint".
+ trigger_bkpt = target.BreakpointCreateByName("trigger_breakpoint",
None)
+ status = process.ReverseContinue()
+ self.assertSuccess(status)
+ threads_now = lldbutil.get_threads_stopped_at_breakpoint(process,
trigger_bkpt)
+ self.assertEqual(threads_now, initial_threads)
+
+ @add_test_categories(["dwarf"])
+ def test_reverse_continue_skip_breakpoint(self):
+ target, process, initial_threads = self.setup_recording()
+
+ # Reverse-continue, skipping a disabled breakpoint at
"trigger_breakpoint".
+ trigger_bkpt = target.BreakpointCreateByName("trigger_breakpoint",
None)
+ trigger_bkpt.SetCondition("0")
+ status = process.ReverseContinue()
+ self.assertSuccess(status)
+ self.expect(
+ "thread list",
+ STOPPED_DUE_TO_HISTORY_BOUNDARY,
+ substrs=["stopped", "stop reason = history boundary"],
+ )
+
+ def setup_recording(self):
+ """
+ Record execution of code between "start_recording" and
"stop_recording" breakpoints.
+
+ Returns with the target stopped at "stop_recording", with recording
disabled,
+ ready to reverse-execute.
+ """
+ self.build()
+ target = self.dbg.CreateTarget("")
+ process = self.connect(target)
+
+ # Record execution from the start of the function "start_recording"
+ # to the start of the function "stop_recording".
+ start_recording_bkpt =
target.BreakpointCreateByName("start_recording", None)
+ initial_threads = lldbutil.continue_to_breakpoint(process,
start_recording_bkpt)
+ self.assertEqual(len(initial_threads), 1)
+ target.BreakpointDelete(start_recording_bkpt.GetID())
+ self.start_recording()
+ stop_recording_bkpt = target.BreakpointCreateByName("stop_recording",
None)
+ lldbutil.continue_to_breakpoint(process, stop_recording_bkpt)
+ target.BreakpointDelete(stop_recording_bkpt.GetID())
+ self.stop_recording()
----------------
rocallahan wrote:
It's important that we only start recording at the `start_recording` function,
not at the very start of the process, because recording execution from the
start to `main` (which can be quite a lot of instructions) could be very slow
and memory-hungry with the naive `lldbreverse` recorder. I've updated my
comments to clarify this.
I'm not sure how a stop-hook would help here. For efficiency we want to record
the minimal range of instructions that supports the testing we want to do; the
`start_recording` and `end_recording` functions mark the boundaries of that
range. One-shot breakpoints would be conceptually simpler than manually
deleting them, but when I wrote the API calls for one-shot it wasn't simpler.
https://github.com/llvm/llvm-project/pull/99736
_______________________________________________
lldb-commits mailing list
lldb-commits@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-commits
