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"""Test reading c-strings from memory via SB API."""
from __future__ import print_function
import os
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class TestReadMemCString(TestBase):
mydir = TestBase.compute_mydir(__file__)
def setUp(self):
TestBase.setUp(self)
# Need to have a char* pointer that points to unmapped memory to run
# this test on other platforms -- Darwin only for now.
@skipUnlessDarwin
def test_read_memory_c_string(self):
"""Test corner case behavior of SBProcess::ReadCStringFromMemory"""
self.build()
self.dbg.SetAsync(False)
self.main_source = "main.c"
self.main_source_spec = lldb.SBFileSpec(self.main_source)
self.exe = os.path.join(os.getcwd(), "read-mem-cstring")
(target, process, thread, bkpt) = lldbutil.run_to_source_breakpoint(
self, 'breakpoint here', self.main_source_spec, None, self.exe)
frame = thread.GetFrameAtIndex(0)
err = lldb.SBError()
empty_str_addr = frame.FindVariable("empty_string").GetValueAsUnsigned(err)
self.assertTrue(err.Success())
self.assertTrue(empty_str_addr != lldb.LLDB_INVALID_ADDRESS)
one_letter_str_addr = frame.FindVariable("one_letter_string").GetValueAsUnsigned(err)
self.assertTrue(err.Success())
self.assertTrue(one_letter_str_addr != lldb.LLDB_INVALID_ADDRESS)
invalid_memory_str_addr = frame.FindVariable("invalid_memory_string").GetValueAsUnsigned(err)
self.assertTrue(err.Success())
self.assertTrue(invalid_memory_str_addr != lldb.LLDB_INVALID_ADDRESS)
# Important: An empty (0-length) c-string must come back as a Python string, not a
# None object.
empty_str = process.ReadCStringFromMemory(empty_str_addr, 2048, err)
self.assertTrue(err.Success())
self.assertTrue(empty_str == "")
one_letter_string = process.ReadCStringFromMemory(one_letter_str_addr, 2048, err)
self.assertTrue(err.Success())
self.assertTrue(one_letter_string == "1")
invalid_memory_string = process.ReadCStringFromMemory(invalid_memory_str_addr, 2048, err)
self.assertTrue(err.Fail())
self.assertTrue(invalid_memory_string == "" or invalid_memory_string == None)
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