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"""
Test basics of linux core file debugging.
"""
from __future__ import print_function
import shutil
import struct
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class LinuxCoreTestCase(TestBase):
NO_DEBUG_INFO_TESTCASE = True
mydir = TestBase.compute_mydir(__file__)
_i386_pid = 32306
_x86_64_pid = 32259
_s390x_pid = 1045
_i386_regions = 4
_x86_64_regions = 5
_s390x_regions = 2
@skipIf(bugnumber="llvm.org/pr26947")
def test_i386(self):
"""Test that lldb can read the process information from an i386 linux core file."""
self.do_test("i386", self._i386_pid, self._i386_regions)
def test_x86_64(self):
"""Test that lldb can read the process information from an x86_64 linux core file."""
self.do_test("x86_64", self._x86_64_pid, self._x86_64_regions)
# This seems to hang on non-s390x platforms for some reason. Disabling for now.
@skipIf(archs=no_match(['s390x']))
def test_s390x(self):
"""Test that lldb can read the process information from an s390x linux core file."""
self.do_test("s390x", self._s390x_pid, self._s390x_regions)
def test_same_pid_running(self):
"""Test that we read the information from the core correctly even if we have a running
process with the same PID around"""
try:
shutil.copyfile("x86_64.out", "x86_64-pid.out")
shutil.copyfile("x86_64.core", "x86_64-pid.core")
with open("x86_64-pid.core", "r+b") as f:
# These are offsets into the NT_PRSTATUS and NT_PRPSINFO structures in the note
# segment of the core file. If you update the file, these offsets may need updating
# as well. (Notes can be viewed with readelf --notes.)
for pid_offset in [0x1c4, 0x320]:
f.seek(pid_offset)
self.assertEqual(struct.unpack("<I", f.read(4))[0], self._x86_64_pid)
# We insert our own pid, and make sure the test still works.
f.seek(pid_offset)
f.write(struct.pack("<I", os.getpid()))
self.do_test("x86_64-pid", os.getpid(), self._x86_64_regions)
finally:
self.RemoveTempFile("x86_64-pid.out")
self.RemoveTempFile("x86_64-pid.core")
def test_two_cores_same_pid(self):
"""Test that we handle the situation if we have two core files with the same PID
around"""
alttarget = self.dbg.CreateTarget("altmain.out")
altprocess = alttarget.LoadCore("altmain.core")
self.assertTrue(altprocess, PROCESS_IS_VALID)
self.assertEqual(altprocess.GetNumThreads(), 1)
self.assertEqual(altprocess.GetProcessID(), self._x86_64_pid)
altframe = altprocess.GetSelectedThread().GetFrameAtIndex(0)
self.assertEqual(altframe.GetFunctionName(), "_start")
self.assertEqual(altframe.GetLineEntry().GetLine(), line_number("altmain.c", "Frame _start"))
error = lldb.SBError()
F = altprocess.ReadCStringFromMemory(altframe.FindVariable("F").GetValueAsUnsigned(), 256, error)
self.assertTrue(error.Success())
self.assertEqual(F, "_start")
# without destroying this process, run the test which opens another core file with the
# same pid
self.do_test("x86_64", self._x86_64_pid, self._x86_64_regions)
def check_memory_regions(self, process, region_count):
region_list = process.GetMemoryRegions()
self.assertEqual(region_list.GetSize(), region_count)
region = lldb.SBMemoryRegionInfo()
# Check we have the right number of regions.
self.assertEqual(region_list.GetSize(), region_count);
# Check that getting a region beyond the last in the list fails.
self.assertFalse(region_list.GetMemoryRegionAtIndex(region_count, region));
# Check each region is valid.
for i in range(region_list.GetSize()):
# Check we can actually get this region.
self.assertTrue(region_list.GetMemoryRegionAtIndex(i, region))
#Every region in the list should be mapped.
self.assertTrue(region.IsMapped())
# Test the address at the start of a region returns it's enclosing region.
begin_address = region.GetRegionBase()
region_at_begin = lldb.SBMemoryRegionInfo()
error = process.GetMemoryRegionInfo(begin_address, region_at_begin)
self.assertEqual(region, region_at_begin)
# Test an address in the middle of a region returns it's enclosing region.
middle_address = (region.GetRegionBase() + region.GetRegionEnd()) / 2l
region_at_middle = lldb.SBMemoryRegionInfo()
error = process.GetMemoryRegionInfo(middle_address, region_at_middle)
self.assertEqual(region, region_at_middle)
# Test the address at the end of a region returns it's enclosing region.
end_address = region.GetRegionEnd() - 1l
region_at_end = lldb.SBMemoryRegionInfo()
error = process.GetMemoryRegionInfo(end_address, region_at_end)
self.assertEqual(region, region_at_end)
# Check that quering the end address does not return this region but
# the next one.
next_region = lldb.SBMemoryRegionInfo()
error = process.GetMemoryRegionInfo(region.GetRegionEnd(), next_region)
self.assertNotEqual(region, next_region)
self.assertEqual(region.GetRegionEnd(), next_region.GetRegionBase())
# Check that query beyond the last region returns an unmapped region
# that ends at LLDB_INVALID_ADDRESS
last_region = lldb.SBMemoryRegionInfo()
region_list.GetMemoryRegionAtIndex(region_count - 1, last_region)
end_region = lldb.SBMemoryRegionInfo()
error = process.GetMemoryRegionInfo(last_region.GetRegionEnd(), end_region)
self.assertFalse(end_region.IsMapped())
self.assertEqual(last_region.GetRegionEnd(), end_region.GetRegionBase())
self.assertEqual(end_region.GetRegionEnd(), lldb.LLDB_INVALID_ADDRESS)
def do_test(self, filename, pid, region_count):
target = self.dbg.CreateTarget(filename + ".out")
process = target.LoadCore(filename + ".core")
self.assertTrue(process, PROCESS_IS_VALID)
self.assertEqual(process.GetNumThreads(), 1)
self.assertEqual(process.GetProcessID(), pid)
thread = process.GetSelectedThread()
self.assertTrue(thread)
self.assertEqual(thread.GetThreadID(), pid)
backtrace = ["bar", "foo", "_start"]
self.assertEqual(thread.GetNumFrames(), len(backtrace))
for i in range(len(backtrace)):
frame = thread.GetFrameAtIndex(i)
self.assertTrue(frame)
self.assertEqual(frame.GetFunctionName(), backtrace[i])
self.assertEqual(frame.GetLineEntry().GetLine(),
line_number("main.c", "Frame " + backtrace[i]))
self.assertEqual(frame.FindVariable("F").GetValueAsUnsigned(), ord(backtrace[i][0]))
self.check_memory_regions(process, region_count)
self.dbg.DeleteTarget(target)
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