lldb/test/API/commands/watchpoints/watchpoint_size/TestWatchpointSizes.py

"""
Test watchpoint size cases (1-byte, 2-byte, 4-byte).
Make sure we can watch all bytes, words or double words individually
when they are packed in a 8-byte region.

"""


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


class WatchpointSizeTestCase(TestBase):
    NO_DEBUG_INFO_TESTCASE = True

    def setUp(self):
        # Call super's setUp().
        TestBase.setUp(self)

        # Source filename.
        self.source = "main.c"

        # Output filename.
        self.exe_name = self.getBuildArtifact("a.out")
        self.d = {"C_SOURCES": self.source, "EXE": self.exe_name}

    # Read-write watchpoints not supported on SystemZ
    @expectedFailureAll(archs=["s390x"])
    def test_byte_size_watchpoints_with_byte_selection(self):
        """Test to selectively watch different bytes in a 8-byte array."""
        self.run_watchpoint_size_test("byteArray", 8, "1")

    # Read-write watchpoints not supported on SystemZ
    @expectedFailureAll(archs=["s390x"])
    def test_two_byte_watchpoints_with_word_selection(self):
        """Test to selectively watch different words in an 8-byte word array."""
        self.run_watchpoint_size_test("wordArray", 4, "2")

    # Read-write watchpoints not supported on SystemZ
    @expectedFailureAll(archs=["s390x"])
    def test_four_byte_watchpoints_with_dword_selection(self):
        """Test to selectively watch two double words in an 8-byte dword array."""
        self.run_watchpoint_size_test("dwordArray", 2, "4")

    def run_watchpoint_size_test(self, arrayName, array_size, watchsize):
        self.build(dictionary=self.d)
        self.setTearDownCleanup(dictionary=self.d)

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

        # Detect line number after which we are going to increment arrayName.
        loc_line = line_number("main.c", "// About to write " + arrayName)

        # Set a breakpoint on the line detected above.
        lldbutil.run_break_set_by_file_and_line(
            self, "main.c", loc_line, num_expected_locations=1, loc_exact=True
        )

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

        for i in range(array_size):
            # 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"],
            )

            # Set a read_write type watchpoint arrayName
            watch_loc = arrayName + "[" + str(i) + "]"
            self.expect(
                "watchpoint set variable -w read_write " + watch_loc,
                WATCHPOINT_CREATED,
                substrs=["Watchpoint created", "size = " + watchsize, "type = rw"],
            )

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

            # Use the '-v' option to do verbose listing of the watchpoint.
            # The hit count should now be 1.
            self.expect("watchpoint list -v", substrs=["hit_count = 1"])

            self.runCmd("process continue")

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

            # Use the '-v' option to do verbose listing of the watchpoint.
            # The hit count should now be 1.
            # Verify hit_count has been updated after value has been read.
            self.expect("watchpoint list -v", substrs=["hit_count = 2"])

            # Delete the watchpoint immediately, but set auto-confirm to true
            # first.
            self.runCmd("settings set auto-confirm true")
            self.expect("watchpoint delete", substrs=["All watchpoints removed."])
            # Restore the original setting of auto-confirm.
            self.runCmd("settings clear auto-confirm")

            self.runCmd("process continue")