llvm/lldb/test/API/python_api/watchpoint/condition/TestWatchpointConditionAPI.py

"""
Test watchpoint condition API.
"""

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


class WatchpointConditionAPITestCase(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 = self.testMethodName
        self.d = {"CXX_SOURCES": self.source, "EXE": self.exe_name}

    def test_watchpoint_cond_api(self):
        """Test watchpoint condition API."""
        self.build(dictionary=self.d)
        self.setTearDownCleanup(dictionary=self.d)
        exe = self.getBuildArtifact(self.exe_name)

        # Create a target by the debugger.
        target = self.dbg.CreateTarget(exe)
        self.assertTrue(target, VALID_TARGET)

        # Now create a breakpoint on main.c.
        breakpoint = target.BreakpointCreateByLocation(self.source, self.line)
        self.assertTrue(
            breakpoint and breakpoint.GetNumLocations() == 1, VALID_BREAKPOINT
        )

        # Now launch the process, and do not stop at the entry point.
        process = target.LaunchSimple(None, None, self.get_process_working_directory())

        # We should be stopped due to the breakpoint.  Get frame #0.
        process = target.GetProcess()
        self.assertState(process.GetState(), lldb.eStateStopped, PROCESS_STOPPED)
        thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
        frame0 = thread.GetFrameAtIndex(0)

        # Watch 'global' for write.
        value = frame0.FindValue("global", lldb.eValueTypeVariableGlobal)
        error = lldb.SBError()
        watchpoint = value.Watch(True, False, True, error)
        self.assertTrue(
            value and watchpoint, "Successfully found the variable and set a watchpoint"
        )
        self.DebugSBValue(value)

        # Now set the condition as "global==5".
        watchpoint.SetCondition("global==5")
        self.expect(watchpoint.GetCondition(), exe=False, startstr="global==5")

        # Hide stdout if not running with '-t' option.
        if not self.TraceOn():
            self.HideStdout()

        print(watchpoint)

        # Continue.  Expect the program to stop due to the variable being
        # written to.
        process.Continue()

        if self.TraceOn():
            lldbutil.print_stacktraces(process)

        thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonWatchpoint)
        self.assertTrue(thread, "The thread stopped due to watchpoint")
        self.DebugSBValue(value)

        # Verify that the condition is met.
        self.assertEqual(value.GetValueAsUnsigned(), 5)