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"""
Use lldb Python SBtarget.WatchAddress() API to create a watchpoint for write of '*g_char_ptr'.
"""
from __future__ import print_function
import os, time
import re
import lldb
import lldbsuite.test.lldbutil as lldbutil
from lldbsuite.test.lldbtest import *
class TargetWatchAddressAPITestCase(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'])
@expectedFailureAndroid(archs=['arm', 'aarch64']) # Watchpoints not supported
@expectedFailureWindows("llvm.org/pr24446")
def test_watch_address(self):
"""Exercise SBTarget.WatchAddress() API to set a watchpoint."""
self.build()
exe = os.path.join(os.getcwd(), "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 = target.WatchAddress(value.GetValueAsUnsigned(), 1, 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.
@add_test_categories(['pyapi'])
@expectedFailureAndroid(archs=['arm', 'aarch64']) # Watchpoints not supported
@skipIf(archs=['mips', 'mipsel', 'mips64', 'mips64el']) # No size constraint on MIPS for watches
def test_watch_address_with_invalid_watch_size(self):
"""Exercise SBTarget.WatchAddress() API but pass an invalid watch_size."""
self.build()
exe = os.path.join(os.getcwd(), "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 = target.WatchAddress(value.GetValueAsUnsigned(), 365, False, True, error)
self.assertFalse(watchpoint)
self.expect(error.GetCString(), exe=False,
substrs = ['watch size of %d is not supported' % 365])
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