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"""
Test lldb watchpoint that uses '-s size' to watch a pointed location with size.
"""
from __future__ import print_function
import os
import time
import re
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class HelloWatchLocationTestCase(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.
self.exe_name = self.testMethodName
self.d = {'CXX_SOURCES': self.source, 'EXE': self.exe_name}
# Watchpoints not supported
@expectedFailureAndroid(archs=['arm', 'aarch64'])
@expectedFailureAll(
oslist=["windows"],
bugnumber="llvm.org/pr24446: WINDOWS XFAIL TRIAGE - Watchpoints not supported on Windows")
# 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 also currently supports only one H/W watchpoint
@expectedFailureAll(archs=['s390x'])
@expectedFailureAll(
oslist=["linux"],
archs=[
"arm",
"aarch64"],
bugnumber="llvm.org/pr27795")
@skipIfDarwin
def test_hello_watchlocation(self):
"""Test watching a location with '-s size' option."""
self.build(dictionary=self.d)
self.setTearDownCleanup(dictionary=self.d)
exe = os.path.join(os.getcwd(), 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 1.
self.expect("watchpoint list -v",
substrs=['hit_count = 1'])
self.runCmd("thread backtrace all")
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