forked from OSchip/llvm-project
144 lines
5.2 KiB
Python
144 lines
5.2 KiB
Python
"""
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Use lldb Python SBtarget.WatchAddress() API to create a watchpoint for write of '*g_char_ptr'.
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"""
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from __future__ import print_function
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import lldb
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from lldbsuite.test.decorators import *
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from lldbsuite.test.lldbtest import *
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from lldbsuite.test import lldbutil
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class TargetWatchAddressAPITestCase(TestBase):
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mydir = TestBase.compute_mydir(__file__)
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NO_DEBUG_INFO_TESTCASE = True
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def setUp(self):
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# Call super's setUp().
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TestBase.setUp(self)
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# Our simple source filename.
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self.source = 'main.cpp'
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# Find the line number to break inside main().
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self.line = line_number(
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self.source, '// Set break point at this line.')
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# This is for verifying that watch location works.
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self.violating_func = "do_bad_thing_with_location"
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def test_watch_address(self):
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"""Exercise SBTarget.WatchAddress() API to set a watchpoint."""
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self.build()
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exe = self.getBuildArtifact("a.out")
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# Create a target by the debugger.
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target = self.dbg.CreateTarget(exe)
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self.assertTrue(target, VALID_TARGET)
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# Now create a breakpoint on main.c.
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breakpoint = target.BreakpointCreateByLocation(self.source, self.line)
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self.assertTrue(breakpoint and
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breakpoint.GetNumLocations() == 1,
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VALID_BREAKPOINT)
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# Now launch the process, and do not stop at the entry point.
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process = target.LaunchSimple(
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None, None, self.get_process_working_directory())
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# We should be stopped due to the breakpoint. Get frame #0.
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process = target.GetProcess()
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self.assertEqual(process.GetState(), lldb.eStateStopped,
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PROCESS_STOPPED)
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thread = lldbutil.get_stopped_thread(
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process, lldb.eStopReasonBreakpoint)
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frame0 = thread.GetFrameAtIndex(0)
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value = frame0.FindValue('g_char_ptr',
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lldb.eValueTypeVariableGlobal)
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pointee = value.CreateValueFromAddress(
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"pointee",
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value.GetValueAsUnsigned(0),
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value.GetType().GetPointeeType())
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# Watch for write to *g_char_ptr.
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error = lldb.SBError()
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watchpoint = target.WatchAddress(
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value.GetValueAsUnsigned(), 1, False, True, error)
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self.assertTrue(value and watchpoint,
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"Successfully found the pointer and set a watchpoint")
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self.DebugSBValue(value)
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self.DebugSBValue(pointee)
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# Hide stdout if not running with '-t' option.
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if not self.TraceOn():
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self.HideStdout()
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print(watchpoint)
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# Continue. Expect the program to stop due to the variable being
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# written to.
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process.Continue()
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if (self.TraceOn()):
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lldbutil.print_stacktraces(process)
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thread = lldbutil.get_stopped_thread(
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process, lldb.eStopReasonWatchpoint)
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self.assertTrue(thread, "The thread stopped due to watchpoint")
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self.DebugSBValue(value)
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self.DebugSBValue(pointee)
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self.expect(
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lldbutil.print_stacktrace(
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thread,
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string_buffer=True),
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exe=False,
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substrs=[
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self.violating_func])
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# This finishes our test.
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# No size constraint on MIPS for watches
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@skipIf(archs=['mips', 'mipsel', 'mips64', 'mips64el'])
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@skipIf(archs=['s390x']) # Likewise on SystemZ
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def test_watch_address_with_invalid_watch_size(self):
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"""Exercise SBTarget.WatchAddress() API but pass an invalid watch_size."""
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self.build()
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exe = self.getBuildArtifact("a.out")
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# Create a target by the debugger.
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target = self.dbg.CreateTarget(exe)
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self.assertTrue(target, VALID_TARGET)
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# Now create a breakpoint on main.c.
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breakpoint = target.BreakpointCreateByLocation(self.source, self.line)
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self.assertTrue(breakpoint and
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breakpoint.GetNumLocations() == 1,
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VALID_BREAKPOINT)
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# Now launch the process, and do not stop at the entry point.
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process = target.LaunchSimple(
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None, None, self.get_process_working_directory())
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# We should be stopped due to the breakpoint. Get frame #0.
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process = target.GetProcess()
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self.assertEqual(process.GetState(), lldb.eStateStopped,
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PROCESS_STOPPED)
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thread = lldbutil.get_stopped_thread(
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process, lldb.eStopReasonBreakpoint)
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frame0 = thread.GetFrameAtIndex(0)
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value = frame0.FindValue('g_char_ptr',
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lldb.eValueTypeVariableGlobal)
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pointee = value.CreateValueFromAddress(
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"pointee",
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value.GetValueAsUnsigned(0),
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value.GetType().GetPointeeType())
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# Watch for write to *g_char_ptr.
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error = lldb.SBError()
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watchpoint = target.WatchAddress(
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value.GetValueAsUnsigned(), 365, False, True, error)
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self.assertFalse(watchpoint)
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self.expect(error.GetCString(), exe=False,
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substrs=['watch size of %d is not supported' % 365])
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