"""
Test lldb watchpoint that uses '-s size' to watch a pointed location with size.
"""
import re
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class HelloWatchLocationTestCase(TestBase):
NO_DEBUG_INFO_TESTCASE = True
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.
self.exe_name = self.testMethodName
self.d = {"CXX_SOURCES": self.source, "EXE": self.exe_name}
# on arm64 targets, lldb has incorrect hit-count / ignore-counts
# for watchpoints when they are hit with multiple threads at
# the same time. Tracked as llvm.org/pr49433
# or rdar://93863107 inside Apple.
def affected_by_radar_93863107(self):
return (
self.getArchitecture() in ["arm64", "arm64e"]
) and self.platformIsDarwin()
# Most of the MIPS boards provide only one H/W watchpoints, and S/W
# watchpoints are not supported yet
@expectedFailureAll(triple=re.compile("^mips"))
# SystemZ and PowerPC also currently supports only one H/W watchpoint
@expectedFailureAll(archs=["powerpc64le", "s390x"])
@skipIfWindows # This test is flaky on Windows
def test_hello_watchlocation(self):
"""Test watching a location with '-s size' option."""
self.build(dictionary=self.d)
self.setTearDownCleanup(dictionary=self.d)
exe = self.getBuildArtifact(self.exe_name)
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, loc_exact=False
)
# 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'.
self.expect(
"watchpoint set expression -w write -s 1 -- g_char_ptr",
WATCHPOINT_CREATED,
substrs=["Watchpoint created", "size = 1", "type = w"],
)
# Get a hold of the watchpoint id just created, it is used later on to
# match the watchpoint id which is expected to be fired.
match = re.match(
"Watchpoint created: Watchpoint (.*):", self.res.GetOutput().splitlines()[0]
)
if match:
expected_wp_id = int(match.group(1), 0)
else:
self.fail("Grokking watchpoint id faailed!")
self.runCmd("expr unsigned val = *g_char_ptr; val")
self.expect(self.res.GetOutput().splitlines()[0], exe=False, endstr=" = 0")
self.runCmd("watchpoint set expression -w write -s 4 -- &threads[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 %d" % expected_wp_id],
)
# 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.expect("frame info", substrs=[self.violating_func])
# 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
)
if not self.affected_by_radar_93863107():
self.expect("watchpoint list -v", substrs=["hit_count = %d" % len(threads)])
self.runCmd("thread backtrace all")
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