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https://github.com/Gericom/teak-llvm.git
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6179c0eb0d
Summary: This patch adds support of watchpoints to the old `ProcessWindows` plugin. The `ProcessWindows` plugin uses the `RegisterContext` to set and reset watchpoints. The `RegisterContext` has some interface to access watchpoints, but it is very limited (e.g. it is impossible to retrieve the last triggered watchpoint with it), that's why I have implemented a slightly different interface in the `RegisterContextWindows`. Moreover, I have made the `ProcessWindows` plugin responsible for search of a vacant watchpoint slot, because watchpoints exist per-process (not per-thread), then we can place the same watchpoint in the same slot in different threads. With this scheme threads don't need to have their own watchpoint lists, and it simplifies identifying of the last triggered watchpoint. Reviewers: asmith, stella.stamenova, amccarth Reviewed By: amccarth Subscribers: labath, zturner, leonid.mashinskiy, abidh, JDevlieghere, lldb-commits Tags: #lldb Differential Revision: https://reviews.llvm.org/D67168 llvm-svn: 371166
106 lines
3.5 KiB
Python
106 lines
3.5 KiB
Python
"""
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Use lldb Python SBValue API to create a watchpoint for read_write of 'globl' var.
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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 SetWatchpointAPITestCase(TestBase):
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mydir = TestBase.compute_mydir(__file__)
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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.c'
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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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@add_test_categories(['pyapi'])
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# Read-write watchpoints not supported on SystemZ
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@expectedFailureAll(archs=['s390x'])
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def test_watch_val(self):
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"""Exercise SBValue.Watch() 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.assertTrue(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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# Watch 'global' for read and write.
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value = frame0.FindValue('global', lldb.eValueTypeVariableGlobal)
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error = lldb.SBError()
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watchpoint = value.Watch(True, True, True, error)
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self.assertTrue(value and watchpoint,
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"Successfully found the variable and set a watchpoint")
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self.DebugSBValue(value)
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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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# Continue. Expect the program to stop due to the variable being read
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# from.
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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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# Continue the process. We don't expect the program to be stopped
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# again.
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process.Continue()
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# At this point, the inferior process should have exited.
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self.assertTrue(
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process.GetState() == lldb.eStateExited,
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PROCESS_EXITED)
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self.dbg.DeleteTarget(target)
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self.assertFalse(watchpoint.IsValid())
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