""" Use lldb Python API to test dynamic values in C++ """ import os, time import re import unittest2 import lldb, lldbutil from lldbtest import * class DynamicValueTestCase(TestBase): mydir = os.path.join("cpp", "dynamic-value") @unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin") @python_api_test def test_get_dynamic_vals_with_dsym(self): """Test fetching C++ dynamic values from pointers & references.""" self.buildDsym() self.do_get_dynamic_vals() @python_api_test def test_get_dynamic_vals_with_dwarf(self): """Test fetching C++ dynamic values from pointers & references.""" self.buildDwarf() self.do_get_dynamic_vals() def setUp(self): # Call super's setUp(). TestBase.setUp(self) # Find the line number to break for main.c. self.do_something_line = line_number('pass-to-base.cpp', '// Break here in doSomething.') self.main_first_call_line = line_number('pass-to-base.cpp', '// Break here and get real addresses of myB and otherB.') self.main_second_call_line = line_number('pass-to-base.cpp', '// Break here and get real address of reallyA.') def examine_value_object_of_this_ptr (self, this_static, this_dynamic, dynamic_location): # Get "this" as its static value self.assertTrue (this_static.IsValid()) this_static_loc = int (this_static.GetValue(), 16) # Get "this" as its dynamic value self.assertTrue (this_dynamic.IsValid()) this_dynamic_typename = this_dynamic.GetTypeName() self.assertTrue (this_dynamic_typename.find('B') != -1) this_dynamic_loc = int (this_dynamic.GetValue(), 16) # Make sure we got the right address for "this" self.assertTrue (this_dynamic_loc == dynamic_location) # And that the static address is greater than the dynamic one self.assertTrue (this_static_loc > this_dynamic_loc) # Now read m_b_value which is only in the dynamic value: this_dynamic_m_b_value = this_dynamic.GetChildMemberWithName('m_b_value', True) self.assertTrue (this_dynamic_m_b_value.IsValid()) m_b_value = int (this_dynamic_m_b_value.GetValue(), 0) self.assertTrue (m_b_value == 10) # Make sure it is not in the static version this_static_m_b_value = this_static.GetChildMemberWithName('m_b_value', False) self.assertTrue (this_static_m_b_value.IsValid() == False) # Okay, now let's make sure that we can get the dynamic type of a child element: contained_auto_ptr = this_dynamic.GetChildMemberWithName ('m_client_A', True) self.assertTrue (contained_auto_ptr.IsValid()) contained_b = contained_auto_ptr.GetChildMemberWithName ('_M_ptr', True) self.assertTrue (contained_b.IsValid()) contained_b_static = contained_auto_ptr.GetChildMemberWithName ('_M_ptr', False) self.assertTrue (contained_b_static.IsValid()) contained_b_addr = int (contained_b.GetValue(), 16) contained_b_static_addr = int (contained_b_static.GetValue(), 16) self.assertTrue (contained_b_addr < contained_b_static_addr) def do_get_dynamic_vals(self): """Get argument vals for the call stack when stopped on a breakpoint.""" exe = os.path.join(os.getcwd(), "a.out") # Create a target from the debugger. target = self.dbg.CreateTarget (exe) self.assertTrue(target.IsValid(), VALID_TARGET) # Set up our breakpoints: do_something_bpt = target.BreakpointCreateByLocation('pass-to-base.cpp', self.do_something_line) self.assertTrue(do_something_bpt.IsValid() and do_something_bpt.GetNumLocations() == 1, VALID_BREAKPOINT) first_call_bpt = target.BreakpointCreateByLocation('pass-to-base.cpp', self.main_first_call_line) self.assertTrue(first_call_bpt.IsValid() and first_call_bpt.GetNumLocations() == 1, VALID_BREAKPOINT) second_call_bpt = target.BreakpointCreateByLocation('pass-to-base.cpp', self.main_second_call_line) self.assertTrue(second_call_bpt.IsValid() and second_call_bpt.GetNumLocations() == 1, VALID_BREAKPOINT) # Now launch the process, and do not stop at the entry point. self.process = target.LaunchSimple (None, None, os.getcwd()) self.assertTrue(self.process.GetState() == lldb.eStateStopped, PROCESS_STOPPED) threads = lldbutil.get_threads_stopped_at_breakpoint (self.process, first_call_bpt) self.assertTrue (len(threads) == 1) thread = threads[0] frame = thread.GetFrameAtIndex(0) # Now find the dynamic addresses of myB and otherB so we can compare them # with the dynamic values we get in doSomething: noDynamic = False useDynamic = True myB = frame.FindVariable ('myB', noDynamic); self.assertTrue (myB.IsValid()) myB_loc = int (myB.GetLocation(), 16) otherB = frame.FindVariable('otherB', noDynamic) self.assertTrue (otherB.IsValid()) otherB_loc = int (otherB.GetLocation(), 16) # Okay now run to doSomething: threads = lldbutil.continue_to_breakpoint (self.process, do_something_bpt) self.assertTrue (len(threads) == 1) thread = threads[0] frame = thread.GetFrameAtIndex(0) # Get "this" using FindVariable: this_static = frame.FindVariable ('this', noDynamic) this_dynamic = frame.FindVariable ('this', useDynamic) self.examine_value_object_of_this_ptr (this_static, this_dynamic, myB_loc) # Get "this" using FindValue, make sure that works too: this_static = frame.FindValue ('this', lldb.eValueTypeVariableArgument, noDynamic) this_dynamic = frame.FindValue ('this', lldb.eValueTypeVariableArgument, useDynamic) self.examine_value_object_of_this_ptr (this_static, this_dynamic, myB_loc) # Get "this" using the EvaluateExpression: # These tests fail for now because EvaluateExpression doesn't currently support dynamic typing... #this_static = frame.EvaluateExpression ('this', False) #this_dynamic = frame.EvaluateExpression ('this', True) #self.examine_value_object_of_this_ptr (this_static, this_dynamic, myB_loc) # The "frame var" code uses another path to get into children, so let's # make sure that works as well: self.expect('frame var -d 1 anotherA.m_client_A._M_ptr', 'frame var finds its way into a child member', patterns = ['\(.* B \*\)']) # Now make sure we also get it right for a reference as well: anotherA_static = frame.FindVariable ('anotherA', False) self.assertTrue (anotherA_static.IsValid()) anotherA_static_addr = int (anotherA_static.GetValue(), 16) anotherA_dynamic = frame.FindVariable ('anotherA', True) self.assertTrue (anotherA_dynamic.IsValid()) anotherA_dynamic_addr = int (anotherA_dynamic.GetValue(), 16) anotherA_dynamic_typename = anotherA_dynamic.GetTypeName() self.assertTrue (anotherA_dynamic_typename.find('B') != -1) self.assertTrue(anotherA_dynamic_addr < anotherA_static_addr) anotherA_m_b_value_dynamic = anotherA_dynamic.GetChildMemberWithName('m_b_value', True) self.assertTrue (anotherA_m_b_value_dynamic.IsValid()) anotherA_m_b_val = int (anotherA_m_b_value_dynamic.GetValue(), 10) self.assertTrue (anotherA_m_b_val == 300) anotherA_m_b_value_static = anotherA_static.GetChildMemberWithName('m_b_value', True) self.assertTrue (anotherA_m_b_value_static.IsValid() == False) # Okay, now continue again, and when we hit the second breakpoint in main threads = lldbutil.continue_to_breakpoint (self.process, second_call_bpt) self.assertTrue (len(threads) == 1) thread = threads[0] frame = thread.GetFrameAtIndex(0) reallyA_value = frame.FindVariable ('reallyA', False) self.assertTrue(reallyA_value.IsValid()) reallyA_loc = int (reallyA_value.GetLocation(), 16) # Finally continue to doSomething again, and make sure we get the right value for anotherA, # which this time around is just an "A". threads = lldbutil.continue_to_breakpoint (self.process, do_something_bpt) self.assertTrue(len(threads) == 1) thread = threads[0] frame = thread.GetFrameAtIndex(0) anotherA_value = frame.FindVariable ('anotherA', True) self.assertTrue(anotherA_value.IsValid()) anotherA_loc = int (anotherA_value.GetValue(), 16) self.assertTrue (anotherA_loc == reallyA_loc) self.assertTrue (anotherA_value.GetTypeName().find ('B') == -1) if __name__ == '__main__': import atexit lldb.SBDebugger.Initialize() atexit.register(lambda: lldb.SBDebugger.Terminate()) unittest2.main()