test/functionalities/watchpoint/watchpoint_set_command/TestWatchpointSetErrorCases.py

"""
Test error cases for the 'watchpoint set' command to make sure it errors out when necessary.
"""

import os, time
import unittest2
import lldb
from lldbtest import *
import lldbutil

class WatchpointSetErrorTestCase(TestBase):

    mydir = TestBase.compute_mydir(__file__)

    @expectedFailureFreeBSD('llvm.org/pr18832')
    def test_error_cases_with_watchpoint_set(self):
        """Test error cases with the 'watchpoint set' command."""
        self.buildDwarf(dictionary=self.d)
        self.setTearDownCleanup(dictionary=self.d)
        self.error_cases_with_watchpoint_set()

    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.')
        # 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}

    def error_cases_with_watchpoint_set(self):
        """Test error cases with the 'watchpoint set' command."""
        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)

        # 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'])

        # Try some error conditions:

        # 'watchpoint set' is now a multiword command.
        self.expect("watchpoint set",
            substrs = ['The following subcommands are supported:',
                       'expression',
                       'variable'])
        self.runCmd("watchpoint set variable -w read_write", check=False)

        # 'watchpoint set expression' with '-w' or '-x' specified now needs
        # an option terminator and a raw expression after that.
        self.expect("watchpoint set expression -w write --", error=True,
            startstr = 'error: ')

        # It's an error if the expression did not evaluate to an address.
        self.expect("watchpoint set expression MyAggregateDataType", error=True,
            startstr = 'error: expression did not evaluate to an address')

        # Wrong size parameter is an error.
        self.expect("watchpoint set variable -x -128", error=True,
            substrs = ['invalid enumeration value'])


if __name__ == '__main__':
    import atexit
    lldb.SBDebugger.Initialize()
    atexit.register(lambda: lldb.SBDebugger.Terminate())
    unittest2.main()