lldb/test/API/commands/watchpoints/watchpoint_commands/command/TestWatchpointCommandLLDB.py

"""
Test 'watchpoint command'.
"""


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


class WatchpointLLDBCommandTestCase(TestBase):
    NO_DEBUG_INFO_TESTCASE = True

    def setUp(self):
        # Call super's setUp().
        TestBase.setUp(self)
        # Our simple source filename.
        self.source = "main.cpp"
        # Find the line number to break inside main().
        self.line = line_number(self.source, "// Set break point at this line.")
        # And the watchpoint variable declaration line number.
        self.decl = line_number(self.source, "// Watchpoint variable declaration.")
        # Build dictionary to have unique executable names for each test
        # method.
        self.exe_name = "a%d.out" % self.test_number
        self.d = {"CXX_SOURCES": self.source, "EXE": self.exe_name}

    def test_watchpoint_command(self):
        """Test 'watchpoint command'."""
        self.build(dictionary=self.d)
        self.setTearDownCleanup(dictionary=self.d)

        exe = self.getBuildArtifact(self.exe_name)
        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)

        # Add a breakpoint to set a watchpoint when stopped on the breakpoint.
        lldbutil.run_break_set_by_file_and_line(
            self, None, self.line, num_expected_locations=1
        )

        # Run the program.
        self.runCmd("run", RUN_SUCCEEDED)

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

        # Now let's set a write-type watchpoint for 'global'.
        self.expect(
            "watchpoint set variable -w write global",
            WATCHPOINT_CREATED,
            substrs=[
                "Watchpoint created",
                "size = 4",
                "type = w",
                "%s:%d" % (self.source, self.decl),
            ],
        )

        self.runCmd('watchpoint command add 1 -o "expr -- cookie = 777"')

        # List the watchpoint command we just added.
        self.expect("watchpoint command list 1", substrs=["expr -- cookie = 777"])

        # Use the '-v' option to do verbose listing of the watchpoint.
        # The hit count should be 0 initially.
        self.expect("watchpoint list -v", substrs=["hit_count = 0"])

        self.runCmd("process continue")

        # We should be stopped again due to the watchpoint (write type).
        # The stop reason of the thread should be watchpoint.
        self.expect(
            "thread backtrace",
            STOPPED_DUE_TO_WATCHPOINT,
            substrs=["stop reason = watchpoint"],
        )

        # Check that the watchpoint snapshoting mechanism is working.
        self.expect(
            "watchpoint list -v",
            substrs=[
                "old value: 0",
                "new value: 1",
                "hit_count = 1",
                "ignore_count = 0",
            ],
        )

        # The watchpoint command "forced" our global variable 'cookie' to
        # become 777.
        self.expect(
            "frame variable --show-globals cookie",
            substrs=["(int32_t)", "cookie = 777"],
        )

    def test_watchpoint_command_can_disable_a_watchpoint(self):
        """Test that 'watchpoint command' action can disable a watchpoint after it is triggered."""
        self.build(dictionary=self.d)
        self.setTearDownCleanup(dictionary=self.d)

        exe = self.getBuildArtifact(self.exe_name)
        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)

        # Add a breakpoint to set a watchpoint when stopped on the breakpoint.
        lldbutil.run_break_set_by_file_and_line(
            self, None, self.line, num_expected_locations=1
        )

        # Run the program.
        self.runCmd("run", RUN_SUCCEEDED)

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

        # Now let's set a write-type watchpoint for 'global'.
        self.expect(
            "watchpoint set variable -w write global",
            WATCHPOINT_CREATED,
            substrs=[
                "Watchpoint created",
                "size = 4",
                "type = w",
                "%s:%d" % (self.source, self.decl),
            ],
        )

        self.runCmd('watchpoint command add 1 -o "watchpoint disable 1"')

        # List the watchpoint command we just added.
        self.expect("watchpoint command list 1", substrs=["watchpoint disable 1"])

        # Use the '-v' option to do verbose listing of the watchpoint.
        # The hit count should be 0 initially.
        self.expect("watchpoint list -v", substrs=["hit_count = 0"])

        self.runCmd("process continue")

        # We should be stopped again due to the watchpoint (write type).
        # The stop reason of the thread should be watchpoint.
        self.expect(
            "thread backtrace",
            STOPPED_DUE_TO_WATCHPOINT,
            substrs=["stop reason = watchpoint"],
        )

        # Check that the watchpoint has been disabled.
        self.expect("watchpoint list -v", substrs=["disabled"])

        self.runCmd("process continue")

        # There should be no more watchpoint hit and the process status should
        # be 'exited'.
        self.expect("process status", substrs=["exited"])