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"""
Test lldb watchpoint that uses 'watchpoint set -w write -s size' to watch a pointed location with size.
"""
from __future__ import print_function
import os
import time
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class WatchLocationUsingWatchpointSetTestCase(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"
# Build dictionary to have unique executable names for each test
# method.
@expectedFailureAll(
oslist=["linux"],
archs=[
'aarch64',
'arm'],
bugnumber="llvm.org/pr26031")
@expectedFailureAll(
oslist=["windows"],
bugnumber="llvm.org/pr24446: WINDOWS XFAIL TRIAGE - Watchpoints not supported on Windows")
@expectedFailureNetBSD
def test_watchlocation_using_watchpoint_set(self):
"""Test watching a location with 'watchpoint set expression -w write -s size' option."""
self.build()
self.setTearDownCleanup()
exe = self.getBuildArtifact("a.out")
self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
# Add a breakpoint to set a watchpoint when stopped on the breakpoint.
lldbutil.run_break_set_by_file_and_line(
self, None, self.line, num_expected_locations=1)
# Run the program.
self.runCmd("run", RUN_SUCCEEDED)
# We should be stopped again due to the breakpoint.
# The stop reason of the thread should be breakpoint.
self.expect("thread list", STOPPED_DUE_TO_BREAKPOINT,
substrs=['stopped',
'stop reason = breakpoint'])
# Now let's set a write-type watchpoint pointed to by 'g_char_ptr' and
# with offset as 7.
# The main.cpp, by design, misbehaves by not following the agreed upon
# protocol of only accessing the allowable index range of [0, 6].
self.expect(
"watchpoint set expression -w write -s 1 -- g_char_ptr + 7",
WATCHPOINT_CREATED,
substrs=[
'Watchpoint created',
'size = 1',
'type = w'])
self.runCmd("expr unsigned val = g_char_ptr[7]; val")
self.expect(self.res.GetOutput().splitlines()[0], exe=False,
endstr=' = 0')
# Use the '-v' option to do verbose listing of the watchpoint.
# The hit count should be 0 initially.
self.expect("watchpoint list -v",
substrs=['hit_count = 0'])
self.runCmd("process continue")
# We should be stopped again due to the watchpoint (write type), but
# only once. The stop reason of the thread should be watchpoint.
self.expect("thread list", STOPPED_DUE_TO_WATCHPOINT,
substrs=['stopped',
'stop reason = watchpoint',
self.violating_func])
# Switch to the thread stopped due to watchpoint and issue some
# commands.
self.switch_to_thread_with_stop_reason(lldb.eStopReasonWatchpoint)
self.runCmd("thread backtrace")
self.runCmd("expr unsigned val = g_char_ptr[7]; val")
self.expect(self.res.GetOutput().splitlines()[0], exe=False,
endstr=' = 99')
# Use the '-v' option to do verbose listing of the watchpoint.
# The hit count should now be the same as the number of threads that
# stopped on a watchpoint.
threads = lldbutil.get_stopped_threads(
self.process(), lldb.eStopReasonWatchpoint)
self.expect("watchpoint list -v",
substrs=['hit_count = %d' % len(threads)])
self.runCmd("thread backtrace all")
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