lldb/test/API/commands/watchpoints/variable_out_of_scope/TestWatchedVarHitWhenInScope.py

"""
Test that a variable watchpoint should only hit when in scope.
"""


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


class WatchedVariableHitWhenInScopeTestCase(TestBase):
    SHARED_BUILD_TESTCASE = False
    NO_DEBUG_INFO_TESTCASE = True

    # This test depends on not tracking watchpoint expression hits if we have
    # left the watchpoint scope.  We will provide such an ability at some point
    # but the way this was done was incorrect, and it is unclear that for the
    # most part that's not what folks mostly want, so we have to provide a
    # clearer API to express this.

    def setUp(self):
        # Call super's setUp().
        TestBase.setUp(self)
        # Our simple source filename.
        self.source = "main.c"
        self.exe_name = self.testMethodName
        self.d = {"C_SOURCES": self.source, "EXE": self.exe_name}

    # Test hangs due to a kernel bug, see fdfeff0f in the linux kernel for details
    @skipIfTargetAndroid(api_levels=list(range(25 + 1)), archs=["aarch64", "arm$"])
    @skip
    def test_watched_var_should_only_hit_when_in_scope(self):
        """Test that a variable watchpoint should only hit when in scope."""
        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 in main.
        lldbutil.run_break_set_by_symbol(self, "main", 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 watchpoint for 'c.a'.
        # There should be only one watchpoint hit (see main.c).
        self.expect(
            "watchpoint set variable c.a",
            WATCHPOINT_CREATED,
            substrs=["Watchpoint created", "size = 4", "type = w"],
        )

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

        self.runCmd("process continue")
        # Don't expect the read of 'global' to trigger a stop exception.
        # The process status should be 'exited'.
        self.expect("process status", substrs=["exited"])

        # 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"])