lldb/test/API/functionalities/inferior-changed/TestInferiorChanged.py

"""Test lldb reloads the inferior after it was changed during the session."""


import time
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import configuration
from lldbsuite.test import lldbutil


@requireNotWasm("wasm has no memory-protection faults/signals")
class ChangedInferiorTestCase(TestBase):
    SHARED_BUILD_TESTCASE = False

    @skipIf(hostoslist=["windows"])
    @no_debug_info_test
    def test_inferior_crashing(self):
        """Test lldb reloads the inferior after it was changed during the session."""
        self.build()
        self.inferior_crashing()
        self.cleanup()
        # lldb needs to recognize the inferior has changed. If lldb needs to check the
        # new module timestamp, make sure it is not the same as the old one, so add a
        # 1 second delay.
        time.sleep(1)
        d = {"C_SOURCES": "main2.c"}
        self.build(dictionary=d)
        self.setTearDownCleanup(dictionary=d)
        self.inferior_not_crashing()

    def setUp(self):
        # Call super's setUp().
        TestBase.setUp(self)
        # Find the line number of the crash.
        self.line1 = line_number("main.c", "// Crash here.")
        self.line2 = line_number("main2.c", "// Not crash here.")

    def inferior_crashing(self):
        """Inferior crashes upon launching; lldb should catch the event and stop."""
        self.exe = self.getBuildArtifact("a.out")
        self.runCmd("file " + self.exe, CURRENT_EXECUTABLE_SET)

        self.runCmd("run", RUN_SUCCEEDED)

        # We should have one crashing thread
        self.assertEqual(
            len(
                lldbutil.get_crashed_threads(
                    self, self.dbg.GetSelectedTarget().GetProcess()
                )
            ),
            1,
            STOPPED_DUE_TO_EXC_BAD_ACCESS,
        )

        # And it should report the correct line number.
        self.expect("thread backtrace all", substrs=["main.c:%d" % self.line1])

    def inferior_not_crashing(self):
        """Test lldb reloads the inferior after it was changed during the session."""
        self.runCmd("process kill")
        self.runCmd("run", RUN_SUCCEEDED)
        self.runCmd("process status")

        self.assertNotEqual(
            len(
                lldbutil.get_crashed_threads(
                    self, self.dbg.GetSelectedTarget().GetProcess()
                )
            ),
            1,
            "Inferior changed, but lldb did not perform a reload",
        )

        # Break inside the main.
        lldbutil.run_break_set_by_file_and_line(
            self, "main2.c", self.line2, num_expected_locations=1, loc_exact=True
        )

        self.runCmd("run", RUN_SUCCEEDED)

        # The stop reason of the thread should be breakpoint.
        self.expect(
            "thread list",
            STOPPED_DUE_TO_BREAKPOINT,
            substrs=["stopped", "stop reason = breakpoint"],
        )

        self.runCmd("frame variable int_ptr")
        self.expect("frame variable *int_ptr", substrs=["= 7"])
        self.expect("expression *int_ptr", substrs=["= 7"])