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"""Test reading c-strings from memory via SB API."""
import os
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class TestReadMemCString(TestBase):
NO_DEBUG_INFO_TESTCASE = True
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_path = os.path.join(self.getSourceDir(), self.main_source)
self.main_source_spec = lldb.SBFileSpec(self.main_source_path)
self.exe = self.getBuildArtifact("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.assertSuccess(err)
self.assertNotEqual(empty_str_addr, lldb.LLDB_INVALID_ADDRESS)
one_letter_str_addr = frame.FindVariable(
"one_letter_string"
).GetValueAsUnsigned(err)
self.assertSuccess(err)
self.assertNotEqual(one_letter_str_addr, lldb.LLDB_INVALID_ADDRESS)
invalid_memory_str_addr = frame.FindVariable(
"invalid_memory_string"
).GetValueAsUnsigned(err)
self.assertSuccess(err)
self.assertNotEqual(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.assertSuccess(err)
self.assertEqual(empty_str, "")
one_letter_string = process.ReadCStringFromMemory(
one_letter_str_addr, 2048, err
)
self.assertSuccess(err)
self.assertEqual(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 is None)
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