| """ |
| Use lldb Python SBValue.WatchPointee() API to create a watchpoint for write of '*g_char_ptr'. |
| """ |
| |
| from __future__ import print_function |
| |
| |
| import os |
| import re |
| import time |
| |
| import lldb |
| from lldbsuite.test.decorators import * |
| from lldbsuite.test.lldbtest import * |
| from lldbsuite.test import lldbutil |
| |
| |
| class SetWatchlocationAPITestCase(TestBase): |
| |
| mydir = TestBase.compute_mydir(__file__) |
| |
| 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.') |
| # This is for verifying that watch location works. |
| self.violating_func = "do_bad_thing_with_location" |
| |
| @add_test_categories(['pyapi']) |
| @expectedFailureAll( |
| oslist=["windows"], |
| bugnumber="llvm.org/pr24446: WINDOWS XFAIL TRIAGE - Watchpoints not supported on Windows") |
| def test_watch_location(self): |
| """Exercise SBValue.WatchPointee() API to set a watchpoint.""" |
| self.build() |
| exe = self.getBuildArtifact("a.out") |
| |
| # 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.assertTrue(process.GetState() == lldb.eStateStopped, |
| PROCESS_STOPPED) |
| thread = lldbutil.get_stopped_thread( |
| process, lldb.eStopReasonBreakpoint) |
| frame0 = thread.GetFrameAtIndex(0) |
| |
| value = frame0.FindValue('g_char_ptr', |
| lldb.eValueTypeVariableGlobal) |
| pointee = value.CreateValueFromAddress( |
| "pointee", |
| value.GetValueAsUnsigned(0), |
| value.GetType().GetPointeeType()) |
| # Watch for write to *g_char_ptr. |
| error = lldb.SBError() |
| watchpoint = value.WatchPointee(True, False, True, error) |
| self.assertTrue(value and watchpoint, |
| "Successfully found the pointer and set a watchpoint") |
| self.DebugSBValue(value) |
| self.DebugSBValue(pointee) |
| |
| # 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) |
| self.DebugSBValue(pointee) |
| |
| self.expect( |
| lldbutil.print_stacktrace( |
| thread, |
| string_buffer=True), |
| exe=False, |
| substrs=[ |
| self.violating_func]) |
| |
| # This finishes our test. |
