TestChangeValueAPI.py   [plain text]

"""
Test some SBValue APIs.
"""

import os, time
import re
import unittest2
import lldb, lldbutil
from lldbtest import *

class ChangeValueAPITestCase(TestBase):

    mydir = os.path.join("python_api", "value", "change_values")

    @unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
    @python_api_test
    @dsym_test
    def test_change_value_with_dsym(self):
        """Exercise the SBValue::SetValueFromCString API."""
        d = {'EXE': self.exe_name}
        self.buildDsym(dictionary=d)
        self.setTearDownCleanup(dictionary=d)
        self.change_value_api(self.exe_name)

    @python_api_test
    @dwarf_test
    def test_change_value_with_dwarf(self):
        """Exercise the SBValue::SetValueFromCString API."""
        d = {'EXE': self.exe_name}
        self.buildDwarf(dictionary=d)
        self.setTearDownCleanup(dictionary=d)
        self.change_value_api(self.exe_name)

    def setUp(self):
        # Call super's setUp().
        TestBase.setUp(self)
        # We'll use the test method name as the exe_name.
        self.exe_name = self.testMethodName
        # Find the line number to of function 'c'.
        self.line = line_number('main.c', '// Stop here and set values')
        self.end_line = line_number ('main.c', '// Set a breakpoint here at the end')

    def change_value_api(self, exe_name):
        """Exercise some SBValue APIs."""
        exe = os.path.join(os.getcwd(), exe_name)

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

        # Create the breakpoint inside function 'main'.
        breakpoint = target.BreakpointCreateByLocation('main.c', self.line)
        self.assertTrue(breakpoint, VALID_BREAKPOINT)

        # Create the breakpoint inside function 'main'.
        end_breakpoint = target.BreakpointCreateByLocation('main.c', self.end_line)
        self.assertTrue(end_breakpoint, VALID_BREAKPOINT)

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

        # Get Frame #0.
        self.assertTrue(process.GetState() == lldb.eStateStopped)
        thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
        self.assertTrue(thread != None, "There should be a thread stopped due to breakpoint condition")
        frame0 = thread.GetFrameAtIndex(0)
        self.assertTrue (frame0.IsValid(), "Got a valid frame.")

        # Get the val variable and change it:
        error = lldb.SBError()

        val_value = frame0.FindVariable ("val")
        self.assertTrue (val_value.IsValid(), "Got the SBValue for val")
        actual_value = val_value.GetValueAsSigned (error, 0);
        self.assertTrue (error.Success(), "Got a value from val")
        self.assertTrue (actual_value == 100, "Got the right value from val")
        
        result = val_value.SetValueFromCString ("12345")
        self.assertTrue (result, "Setting val returned True.")
        actual_value = val_value.GetValueAsSigned (error, 0);
        self.assertTrue (error.Success(), "Got a changed value from val")
        self.assertTrue (actual_value == 12345, "Got the right changed value from val")
        
        # Now check that we can set a structure element:

        mine_value = frame0.FindVariable ("mine")
        self.assertTrue (mine_value.IsValid(), "Got the SBValue for mine")
        
        mine_second_value = mine_value.GetChildMemberWithName ("second_val")
        self.assertTrue (mine_second_value.IsValid(), "Got second_val from mine")
        actual_value = mine_second_value.GetValueAsUnsigned (error, 0)
        self.assertTrue (error.Success(), "Got an unsigned value for second_val")
        self.assertTrue (actual_value == 5555)

        result = mine_second_value.SetValueFromCString ("98765")
        self.assertTrue (result, "Success setting mine.second_value.")
        actual_value = mine_second_value.GetValueAsSigned (error, 0);
        self.assertTrue (error.Success(), "Got a changed value from mine.second_val")
        self.assertTrue (actual_value == 98765, "Got the right changed value from mine.second_val")
        
        # Next do the same thing with the pointer version.
        ptr_value = frame0.FindVariable ("ptr")
        self.assertTrue (ptr_value.IsValid(), "Got the SBValue for ptr")
        
        ptr_second_value = ptr_value.GetChildMemberWithName ("second_val")
        self.assertTrue (ptr_second_value.IsValid(), "Got second_val from ptr")
        actual_value = ptr_second_value.GetValueAsUnsigned (error, 0)
        self.assertTrue (error.Success(), "Got an unsigned value for ptr->second_val")
        self.assertTrue (actual_value == 6666)

        result = ptr_second_value.SetValueFromCString ("98765")
        self.assertTrue (result, "Success setting ptr->second_value.")
        actual_value = ptr_second_value.GetValueAsSigned (error, 0);
        self.assertTrue (error.Success(), "Got a changed value from ptr->second_val")
        self.assertTrue (actual_value == 98765, "Got the right changed value from ptr->second_val")
        
        # Now step, grab the stdout and make sure we changed the real values as well...
        thread.StepOver()
        expected_value = "Val - 12345 Mine - 55, 98765, 55555555. Ptr - 66, 98765, 66666666"
        stdout = process.GetSTDOUT(1000)
        self.assertTrue (expected_value in stdout, "STDOUT showed changed values.")

        # Finally, change the stack pointer to 0, and we should not make it to our end breakpoint.
        frame0 = thread.GetFrameAtIndex(0)
        self.assertTrue (frame0.IsValid(), "Second time: got a valid frame.")
        sp_value = frame0.FindValue ("sp", lldb.eValueTypeRegister);
        self.assertTrue (sp_value.IsValid(), "Got a stack pointer value")
        result = sp_value.SetValueFromCString("1")
        self.assertTrue (result, "Setting sp returned true.")
        actual_value = sp_value.GetValueAsUnsigned (error, 0)
        self.assertTrue (error.Success(), "Got a changed value for sp")
        self.assertTrue (actual_value == 1, "Got the right changed value for sp.")
        
        # Boundary condition test the SBValue.CreateValueFromExpression() API.
        # LLDB should not crash!
        nosuchval = mine_value.CreateValueFromExpression(None, None)

        process.Continue()

        self.assertTrue(process.GetState() == lldb.eStateStopped)
        thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
        self.assertTrue(thread == None, "We should not have managed to hit our second breakpoint with sp == 1")
        
        process.Kill()

if __name__ == '__main__':
    import atexit
    lldb.SBDebugger.Initialize()
    atexit.register(lambda: lldb.SBDebugger.Terminate())
    unittest2.main()