test/load_unload/TestLoadUnload.py

"""
Test that breakpoint by symbol name works correctly with dynamic libs.
"""

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

class LoadUnloadTestCase(TestBase):

    mydir = "load_unload"

    def setUp(self):
        # Call super's setUp().
        TestBase.setUp(self)
        # Find the line number to break for main.cpp.
        self.line = line_number('main.c',
                                '// Set break point at this line for test_lldb_process_load_and_unload_commands().')
        self.line_d_function = line_number('d.c',
                                           '// Find this line number within d_dunction().')

    def test_dyld_library_path(self):
        """Test DYLD_LIBRARY_PATH after moving libd.dylib, which defines d_function, somewhere else."""

        # Invoke the default build rule.
        self.buildDefault()

        if sys.platform.startswith("darwin"):
            dylibName = 'libd.dylib'
            dsymName = 'libd.dylib.dSYM'
            dylibPath = 'DYLD_LIBRARY_PATH'

        # Now let's move the dynamic library to a different directory than $CWD.

        # The directory to relocate the dynamic library and its debugging info.
        new_dir = os.path.join(os.getcwd(), "dyld_path")

        # This is the function to remove the dyld_path directory after the test.
        def remove_dyld_path():
            import shutil
            shutil.rmtree(new_dir)

        old_dylib = os.path.join(os.getcwd(), dylibName)
        new_dylib = os.path.join(new_dir, dylibName)
        old_dSYM = os.path.join(os.getcwd(), dsymName)
        new_dSYM = os.path.join(new_dir, dsymName)
        #system(["ls", "-lR", "."])
        os.mkdir(new_dir)
        os.rename(old_dylib, new_dylib)
        if dsymName:
            os.rename(old_dSYM, new_dSYM)
        self.addTearDownHook(remove_dyld_path)
        #system(["ls", "-lR", "."])

        # With libd.dylib moved, a.out run should fail.
        exe = os.path.join(os.getcwd(), "a.out")
        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
        # Set breakpoint by function name d_function.
        self.expect("breakpoint set -n d_function", BREAKPOINT_CREATED,
            substrs = ["Breakpoint created",
                       "name = 'd_function'",
                       "locations = 0 (pending)"])
        self.runCmd("run")
        self.expect("process status", "Not expected to hit the d_function breakpoint",
                    matching=False,
            substrs = ["stop reason = breakpoint"])
        # Kill the inferior process.
        self.runCmd("process kill")

        # Try again with the DYLD_LIBRARY_PATH environment variable properly set.
        os.environ[dylibPath] = new_dir
        self.runCmd("run")
        self.expect("thread backtrace", STOPPED_DUE_TO_BREAKPOINT,
            patterns = ["frame #0.*d_function.*at d.c:%d" % self.line_d_function])

    def test_lldb_process_load_and_unload_commands(self):
        """Test that lldb process load/unload command work correctly."""

        # Invoke the default build rule.
        self.buildDefault()

        exe = os.path.join(os.getcwd(), "a.out")
        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)

        # Break at main.c before the call to dlopen().
        # Use lldb's process load command to load the dylib, instead.

        self.expect("breakpoint set -f main.c -l %d" % self.line,
                    BREAKPOINT_CREATED,
            startstr = "Breakpoint created: 1: file ='main.c', line = %d" %
                        self.line)

        self.runCmd("run", RUN_SUCCEEDED)

        # Make sure that a_function does not exist at this point.
        self.expect("image lookup -n a_function", "a_function should not exist yet",
                    error=True, matching=False,
            patterns = ["1 match found .* %s" % self.mydir])

        # Use lldb 'process load' to load the dylib.
        self.expect("process load liba.dylib", "liba.dylib loaded correctly",
            patterns = ['Loading "liba.dylib".*ok',
                        'Image [0-9]+ loaded'])

        # Search for and match the "Image ([0-9]+) loaded" pattern.
        output = self.res.GetOutput()
        pattern = re.compile("Image ([0-9]+) loaded")
        for l in output.split(os.linesep):
            #print "l:", l
            match = pattern.search(l)
            if match:
                break
        index = match.group(1)

        # Now we should have an entry for a_function.
        self.expect("image lookup -n a_function", "a_function should now exist",
            patterns = ["1 match found .*%s" % self.mydir])

        # Use lldb 'process unload' to unload the dylib.
        self.expect("process unload %s" % index, "liba.dylib unloaded correctly",
            patterns = ["Unloading .* with index %s.*ok" % index])

        self.runCmd("process continue")

    def test_load_unload(self):
        """Test breakpoint by name works correctly with dlopen'ing."""

        # Invoke the default build rule.
        self.buildDefault()

        exe = os.path.join(os.getcwd(), "a.out")
        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)

        # Break by function name a_function (not yet loaded).
        self.expect("breakpoint set -n a_function", BREAKPOINT_CREATED,
            startstr = "Breakpoint created: 1: name = 'a_function', locations = 0 (pending)")

        self.runCmd("run", RUN_SUCCEEDED)

        # The stop reason of the thread should be breakpoint and at a_function.
        self.expect("thread list", STOPPED_DUE_TO_BREAKPOINT,
            substrs = ['state is stopped',
                       'a_function',
                       'stop reason = breakpoint'])

        # The breakpoint should have a hit count of 1.
        self.expect("breakpoint list", BREAKPOINT_HIT_ONCE,
            substrs = [' resolved, hit count = 1'])

        # Issue the 'contnue' command.  We should stop agaian at a_function.
        # The stop reason of the thread should be breakpoint and at a_function.
        self.runCmd("continue")

        # rdar://problem/8508987
        # The a_function breakpoint should be encountered twice.
        self.expect("thread list", STOPPED_DUE_TO_BREAKPOINT,
            substrs = ['state is stopped',
                       'a_function',
                       'stop reason = breakpoint'])

        # The breakpoint should have a hit count of 2.
        self.expect("breakpoint list", BREAKPOINT_HIT_ONCE,
            substrs = [' resolved, hit count = 2'])


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