Package lldb :: Package utils :: Module symbolication |
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# Source Code for Module lldb.utils.symbolication

      1  #!/usr/bin/python
      2
      3  #----------------------------------------------------------------------
      4  # Be sure to add the python path that points to the LLDB shared library.
      5  #
      6  # To use this in the embedded python interpreter using "lldb":
      7  #
      8  #   cd /path/containing/crashlog.py
      9  #   lldb
     10  #   (lldb) script import crashlog
     11  #   "crashlog" command installed, type "crashlog --help" for detailed help
     12  #   (lldb) crashlog ~/Library/Logs/DiagnosticReports/a.crash
     13  #
     14  # The benefit of running the crashlog command inside lldb in the
     15  # embedded python interpreter is when the command completes, there
     16  # will be a target with all of the files loaded at the locations
     17  # described in the crash log. Only the files that have stack frames
     18  # in the backtrace will be loaded unless the "--load-all" option
     19  # has been specified. This allows users to explore the program in the
     20  # state it was in right at crash time.
     21  #
     22  # On MacOSX csh, tcsh:
     23  #   ( setenv PYTHONPATH /path/to/LLDB.framework/Resources/Python ; ./crashlog.py ~/Library/Logs/DiagnosticReports/a.crash )
     24  #
     25  # On MacOSX sh, bash:
     26  #   PYTHONPATH=/path/to/LLDB.framework/Resources/Python ./crashlog.py ~/Library/Logs/DiagnosticReports/a.crash
     27  #----------------------------------------------------------------------
     28
     29  import lldb
     30  import commands
     31  import optparse
     32  import os
     33  import plistlib
     34  import re
     35  import shlex
     36  import sys
     37  import time
     38  import uuid
     39
     40 -class Address:
     41      """Class that represents an address that will be symbolicated"""
     42 -    def __init__(self, target, load_addr):
     43          self.target = target
     44          self.load_addr = load_addr # The load address that this object represents
     45          self.so_addr = None # the resolved lldb.SBAddress (if any), named so_addr for section/offset address
     46          self.sym_ctx = None # The cached symbol context for this address
     47          self.description = None # Any original textual description of this address to be used as a backup in case symbolication fails
     48          self.symbolication = None # The cached symbolicated string that describes this address
     49          self.inlined = False
     50 -    def __str__(self):
     51          s = "%#16.16x" % (self.load_addr)
     52          if self.symbolication:
     53              s += " %s" % (self.symbolication)
     54          elif self.description:
     55              s += " %s" % (self.description)
     56          elif self.so_addr:
     57              s += " %s" % (self.so_addr)
     58          return s
     59
     60 -    def resolve_addr(self):
     61          if self.so_addr == None:
     62              self.so_addr = self.target.ResolveLoadAddress (self.load_addr)
     63          return self.so_addr
     64
     65 -    def is_inlined(self):
     66          return self.inlined
     67
     68 -    def get_symbol_context(self):
     69          if self.sym_ctx == None:
     70              sb_addr = self.resolve_addr()
     71              if sb_addr:
     72                  self.sym_ctx = self.target.ResolveSymbolContextForAddress (sb_addr, lldb.eSymbolContextEverything)
     73              else:
     74                  self.sym_ctx = lldb.SBSymbolContext()
     75          return self.sym_ctx
     76
     77 -    def get_instructions(self):
     78          sym_ctx = self.get_symbol_context()
     79          if sym_ctx:
     80              function = sym_ctx.GetFunction()
     81              if function:
     82                  return function.GetInstructions(self.target)
     83              return sym_ctx.GetSymbol().GetInstructions(self.target)
     84          return None
     85
     86 -    def symbolicate(self, verbose = False):
     87          if self.symbolication == None:
     88              self.symbolication = ''
     89              self.inlined = False
     90              sym_ctx = self.get_symbol_context()
     91              if sym_ctx:
     92                  module = sym_ctx.GetModule()
     93                  if module:
     94                      # Print full source file path in verbose mode
     95                      if verbose:
     96                          self.symbolication += str(module.GetFileSpec()) + '`'
     97                      else:
     98                          self.symbolication += module.GetFileSpec().GetFilename() + '`'
     99                      function_start_load_addr = -1
    100                      function = sym_ctx.GetFunction()
    101                      block = sym_ctx.GetBlock()
    102                      line_entry = sym_ctx.GetLineEntry()
    103                      symbol = sym_ctx.GetSymbol()
    104                      inlined_block = block.GetContainingInlinedBlock();
    105                      if function:
    106                          self.symbolication += function.GetName()
    107
    108                          if inlined_block:
    109                              self.inlined = True
    110                              self.symbolication += ' [inlined] ' + inlined_block.GetInlinedName();
    111                              block_range_idx = inlined_block.GetRangeIndexForBlockAddress (self.so_addr)
    112                              if block_range_idx < lldb.UINT32_MAX:
    113                                  block_range_start_addr = inlined_block.GetRangeStartAddress (block_range_idx)
    114                                  function_start_load_addr = block_range_start_addr.GetLoadAddress (self.target)
    115                          if function_start_load_addr == -1:
    116                              function_start_load_addr = function.GetStartAddress().GetLoadAddress (self.target)
    117                      elif symbol:
    118                          self.symbolication += symbol.GetName()
    119                          function_start_load_addr = symbol.GetStartAddress().GetLoadAddress (self.target)
    120                      else:
    121                          self.symbolication = ''
    122                          return False
    123
    124                      # Dump the offset from the current function or symbol if it is non zero
    125                      function_offset = self.load_addr - function_start_load_addr
    126                      if function_offset > 0:
    127                          self.symbolication += " + %u" % (function_offset)
    128                      elif function_offset < 0:
    129                          self.symbolication += " %i (invalid negative offset, file a bug) " % function_offset
    130
    131                      # Print out any line information if any is available
    132                      if line_entry.GetFileSpec():
    133                          # Print full source file path in verbose mode
    134                          if verbose:
    135                              self.symbolication += ' at %s' % line_entry.GetFileSpec()
    136                          else:
    137                              self.symbolication += ' at %s' % line_entry.GetFileSpec().GetFilename()
    138                          self.symbolication += ':%u' % line_entry.GetLine ()
    139                          column = line_entry.GetColumn()
    140                          if column > 0:
    141                              self.symbolication += ':%u' % column
    142                      return True
    143          return False
    144
    145 -class Section:
    146      """Class that represents an load address range"""
    147      sect_info_regex = re.compile('(?P<name>[^=]+)=(?P<range>.*)')
    148      addr_regex = re.compile('^\s*(?P<start>0x[0-9A-Fa-f]+)\s*$')
    149      range_regex = re.compile('^\s*(?P<start>0x[0-9A-Fa-f]+)\s*(?P<op>[-+])\s*(?P<end>0x[0-9A-Fa-f]+)\s*$')
    150
    151 -    def __init__(self, start_addr = None, end_addr = None, name = None):
    152          self.start_addr = start_addr
    153          self.end_addr = end_addr
    154          self.name = name
    155
    156 -    def contains(self, addr):
    157          return self.start_addr <= addr and addr < self.end_addr;
    158
    159 -    def set_from_string(self, s):
    160          match = self.sect_info_regex.match (s)
    161          if match:
    162              self.name = match.group('name')
    163              range_str = match.group('range')
    164              addr_match = self.addr_regex.match(range_str)
    165              if addr_match:
    166                  self.start_addr = int(addr_match.group('start'), 16)
    167                  self.end_addr = None
    168                  return True
    169
    170              range_match = self.range_regex.match(range_str)
    171              if range_match:
    172                  self.start_addr = int(range_match.group('start'), 16)
    173                  self.end_addr = int(range_match.group('end'), 16)
    174                  op = range_match.group('op')
    175                  if op == '+':
    176                      self.end_addr += self.start_addr
    177                  return True
    178          print 'error: invalid section info string "%s"' % s
    179          print 'Valid section info formats are:'
    180          print 'Format                Example                    Description'
    181          print '--------------------- -----------------------------------------------'
    182          print '<name>=<base>        __TEXT=0x123000             Section from base address only'
    183          print '<name>=<base>-<end>  __TEXT=0x123000-0x124000    Section from base address and end address'
    184          print '<name>=<base>+<size> __TEXT=0x123000+0x1000      Section from base address and size'
    185          return False
    186
    187 -    def __str__(self):
    188          if self.name:
    189              if self.end_addr != None:
    190                  if self.start_addr != None:
    191                      return "%s=[0x%16.16x - 0x%16.16x)" % (self.name, self.start_addr, self.end_addr)
    192              else:
    193                  if self.start_addr != None:
    194                      return "%s=0x%16.16x" % (self.name, self.start_addr)
    195              return self.name
    196          return "<invalid>"
    197
    198 -class Image:
    199      """A class that represents an executable image and any associated data"""
    200
    201 -    def __init__(self, path, uuid = None):
    202          self.path = path
    203          self.resolved_path = None
    204          self.resolved = False
    205          self.unavailable = False
    206          self.uuid = uuid
    207          self.section_infos = list()
    208          self.identifier = None
    209          self.version = None
    210          self.arch = None
    211          self.module = None
    212          self.symfile = None
    213          self.slide = None
    214
    215
    216 -    def dump(self, prefix):
    217          print "%s%s" % (prefix, self)
    218
    219 -    def debug_dump(self):
    220          print 'path = "%s"' % (self.path)
    221          print 'resolved_path = "%s"' % (self.resolved_path)
    222          print 'resolved = %i' % (self.resolved)
    223          print 'unavailable = %i' % (self.unavailable)
    224          print 'uuid = %s' % (self.uuid)
    225          print 'section_infos = %s' % (self.section_infos)
    226          print 'identifier = "%s"' % (self.identifier)
    227          print 'version = %s' % (self.version)
    228          print 'arch = %s' % (self.arch)
    229          print 'module = %s' % (self.module)
    230          print 'symfile = "%s"' % (self.symfile)
    231          print 'slide = %i (0x%x)' % (self.slide, self.slide)
    232
    233 -    def __str__(self):
    234          s = "%s %s %s" % (self.get_uuid(), self.version, self.get_resolved_path())
    235          for section_info in self.section_infos:
    236              s += ", %s" % (section_info)
    237          if self.slide != None:
    238              s += ', slide = 0x%16.16x' % self.slide
    239          return s
    240
    241 -    def add_section(self, section):
    242          #print "added '%s' to '%s'" % (section, self.path)
    243          self.section_infos.append (section)
    244
    245 -    def get_section_containing_load_addr (self, load_addr):
    246          for section_info in self.section_infos:
    247              if section_info.contains(load_addr):
    248                  return section_info
    249          return None
    250
    251 -    def get_resolved_path(self):
    252          if self.resolved_path:
    253              return self.resolved_path
    254          elif self.path:
    255              return self.path
    256          return None
    257
    258 -    def get_resolved_path_basename(self):
    259          path = self.get_resolved_path()
    260          if path:
    261              return os.path.basename(path)
    262          return None
    263
    264 -    def symfile_basename(self):
    265          if self.symfile:
    266              return os.path.basename(self.symfile)
    267          return None
    268
    269 -    def has_section_load_info(self):
    270          return self.section_infos or self.slide != None
    271
    272 -    def load_module(self, target):
    273          if self.unavailable:
    274              return None # We already warned that we couldn't find this module, so don't return an error string
    275          # Load this module into "target" using the section infos to
    276          # set the section load addresses
    277          if self.has_section_load_info():
    278              if target:
    279                  if self.module:
    280                      if self.section_infos:
    281                          num_sections_loaded = 0
    282                          for section_info in self.section_infos:
    283                              if section_info.name:
    284                                  section = self.module.FindSection (section_info.name)
    285                                  if section:
    286                                      error = target.SetSectionLoadAddress (section, section_info.start_addr)
    287                                      if error.Success():
    288                                          num_sections_loaded += 1
    289                                      else:
    290                                          return 'error: %s' % error.GetCString()
    291                                  else:
    292                                      return 'error: unable to find the section named "%s"' % section_info.name
    293                              else:
    294                                  return 'error: unable to find "%s" section in "%s"' % (range.name, self.get_resolved_path())
    295                          if num_sections_loaded == 0:
    296                              return 'error: no sections were successfully loaded'
    297                      else:
    298                          err = target.SetModuleLoadAddress(self.module, self.slide)
    299                          if err.Fail():
    300                              return err.GetCString()
    301                      return None
    302                  else:
    303                      return 'error: invalid module'
    304              else:
    305                  return 'error: invalid target'
    306          else:
    307              return 'error: no section infos'
    308
    309 -    def add_module(self, target):
    310          '''Add the Image described in this object to "target" and load the sections if "load" is True.'''
    311          if target:
    312              # Try and find using UUID only first so that paths need not match up
    313              uuid_str = self.get_normalized_uuid_string()
    314              if uuid_str:
    315                  self.module = target.AddModule (None, None, uuid_str)
    316              if not self.module:
    317                  self.locate_module_and_debug_symbols ()
    318                  if self.unavailable:
    319                      return None
    320                  resolved_path = self.get_resolved_path()
    321                  self.module = target.AddModule (resolved_path, self.arch, uuid_str, self.symfile)
    322              if not self.module:
    323                  return 'error: unable to get module for (%s) "%s"' % (self.arch, self.get_resolved_path())
    324              if self.has_section_load_info():
    325                  return self.load_module(target)
    326              else:
    327                  return None # No sections, the module was added to the target, so success
    328          else:
    329              return 'error: invalid target'
    330
    331 -    def locate_module_and_debug_symbols (self):
    332          # By default, just use the paths that were supplied in:
    333          # self.path
    334          # self.resolved_path
    335          # self.module
    336          # self.symfile
    337          # Subclasses can inherit from this class and override this function
    338          self.resolved = True
    339          return True
    340
    341 -    def get_uuid(self):
    342          if not self.uuid and self.module:
    343              self.uuid = uuid.UUID(self.module.GetUUIDString())
    344          return self.uuid
    345
    346 -    def get_normalized_uuid_string(self):
    347          if self.uuid:
    348              return str(self.uuid).upper()
    349          return None
    350
    351 -    def create_target(self):
    352          '''Create a target using the information in this Image object.'''
    353          if self.unavailable:
    354              return None
    355
    356          if self.locate_module_and_debug_symbols ():
    357              resolved_path = self.get_resolved_path();
    358              path_spec = lldb.SBFileSpec (resolved_path)
    359              #result.PutCString ('plist[%s] = %s' % (uuid, self.plist))
    360              error = lldb.SBError()
    361              target = lldb.debugger.CreateTarget (resolved_path, self.arch, None, False, error);
    362              if target:
    363                  self.module = target.FindModule(path_spec)
    364                  if self.has_section_load_info():
    365                      err = self.load_module(target)
    366                      if err:
    367                          print 'ERROR: ', err
    368                  return target
    369              else:
    370                  print 'error: unable to create a valid target for (%s) "%s"' % (self.arch, self.path)
    371          else:
    372              print 'error: unable to locate main executable (%s) "%s"' % (self.arch, self.path)
    373          return None
    374
    375 -class Symbolicator:
    376
    377 -    def __init__(self):
    378          """A class the represents the information needed to symbolicate addresses in a program"""
    379          self.target = None
    380          self.images = list() # a list of images to be used when symbolicating
    381          self.addr_mask = 0xffffffffffffffff
    382
    383 -    def __str__(self):
    384          s = "Symbolicator:\n"
    385          if self.target:
    386              s += "Target = '%s'\n" % (self.target)
    387              s += "Target modules:'\n"
    388              for m in self.target.modules:
    389                  print m
    390          s += "Images:\n"
    391          for image in self.images:
    392              s += '    %s\n' % (image)
    393          return s
    394
    395 -    def find_images_with_identifier(self, identifier):
    396          images = list()
    397          for image in self.images:
    398              if image.identifier == identifier:
    399                  images.append(image)
    400          return images
    401
    402 -    def find_image_containing_load_addr(self, load_addr):
    403          for image in self.images:
    404              if image.get_section_containing_load_addr (load_addr):
    405                  return image
    406          return None
    407
    408 -    def create_target(self):
    409          if self.target:
    410              return self.target
    411
    412          if self.images:
    413              for image in self.images:
    414                  self.target = image.create_target ()
    415                  if self.target:
    416                      if self.target.GetAddressByteSize() == 4:
    417                          triple = self.target.triple
    418                          if triple:
    419                              arch = triple.split('-')[0]
    420                              if "arm" in arch:
    421                                  self.addr_mask = 0xfffffffffffffffe
    422                      return self.target
    423          return None
    424
    425 -    def symbolicate(self, load_addr, verbose = False):
    426          if not self.target:
    427              self.create_target()
    428          if self.target:
    429              live_process = False
    430              process = self.target.process
    431              if process:
    432                  state = process.state
    433                  if state > lldb.eStateUnloaded and state < lldb.eStateDetached:
    434                      live_process = True
    435              # If we don't have a live process, we can attempt to find the image
    436              # that a load address belongs to and lazily load its module in the
    437              # target, but we shouldn't do any of this if we have a live process
    438              if not live_process:
    439                  image = self.find_image_containing_load_addr (load_addr)
    440                  if image:
    441                      image.add_module (self.target)
    442              symbolicated_address = Address(self.target, load_addr)
    443              if symbolicated_address.symbolicate (verbose):
    444                  if symbolicated_address.so_addr:
    445                      symbolicated_addresses = list()
    446                      symbolicated_addresses.append(symbolicated_address)
    447                      # See if we were able to reconstruct anything?
    448                      while 1:
    449                          inlined_parent_so_addr = lldb.SBAddress()
    450                          inlined_parent_sym_ctx = symbolicated_address.sym_ctx.GetParentOfInlinedScope (symbolicated_address.so_addr, inlined_parent_so_addr)
    451                          if not inlined_parent_sym_ctx:
    452                              break
    453                          if not inlined_parent_so_addr:
    454                              break
    455
    456                          symbolicated_address = Address(self.target, inlined_parent_so_addr.GetLoadAddress(self.target))
    457                          symbolicated_address.sym_ctx = inlined_parent_sym_ctx
    458                          symbolicated_address.so_addr = inlined_parent_so_addr
    459                          symbolicated_address.symbolicate (verbose)
    460
    461                          # push the new frame onto the new frame stack
    462                          symbolicated_addresses.append (symbolicated_address)
    463
    464                      if symbolicated_addresses:
    465                          return symbolicated_addresses
    466          else:
    467              print 'error: no target in Symbolicator'
    468          return None
    469
    470
    471 -def disassemble_instructions (target, instructions, pc, insts_before_pc, insts_after_pc, non_zeroeth_frame):
    472      lines = list()
    473      pc_index = -1
    474      comment_column = 50
    475      for inst_idx, inst in enumerate(instructions):
    476          inst_pc = inst.GetAddress().GetLoadAddress(target);
    477          if pc == inst_pc:
    478              pc_index = inst_idx
    479          mnemonic = inst.GetMnemonic (target)
    480          operands =  inst.GetOperands (target)
    481          comment =  inst.GetComment (target)
    482          #data = inst.GetData (target)
    483          lines.append ("%#16.16x: %8s %s" % (inst_pc, mnemonic, operands))
    484          if comment:
    485              line_len = len(lines[-1])
    486              if line_len < comment_column:
    487                  lines[-1] += ' ' * (comment_column - line_len)
    488                  lines[-1] += "; %s" % comment
    489
    490      if pc_index >= 0:
    491          # If we are disassembling the non-zeroeth frame, we need to backup the PC by 1
    492          if non_zeroeth_frame and pc_index > 0:
    493              pc_index = pc_index - 1
    494          if insts_before_pc == -1:
    495              start_idx = 0
    496          else:
    497              start_idx = pc_index - insts_before_pc
    498          if start_idx < 0:
    499              start_idx = 0
    500          if insts_before_pc == -1:
    501              end_idx = inst_idx
    502          else:
    503              end_idx = pc_index + insts_after_pc
    504          if end_idx > inst_idx:
    505              end_idx = inst_idx
    506          for i in range(start_idx, end_idx+1):
    507              if i == pc_index:
    508                  print ' -> ', lines[i]
    509              else:
    510                  print '    ', lines[i]
    511
    512 -def print_module_section_data (section):
    513      print section
    514      section_data = section.GetSectionData()
    515      if section_data:
    516          ostream = lldb.SBStream()
    517          section_data.GetDescription (ostream, section.GetFileAddress())
    518          print ostream.GetData()
    519
    520 -def print_module_section (section, depth):
    521      print section
    522      if depth > 0:
    523          num_sub_sections = section.GetNumSubSections()
    524          for sect_idx in range(num_sub_sections):
    525              print_module_section (section.GetSubSectionAtIndex(sect_idx), depth - 1)
    526
    527 -def print_module_sections (module, depth):
    528      for sect in module.section_iter():
    529          print_module_section (sect, depth)
    530
    531 -def print_module_symbols (module):
    532      for sym in module:
    533          print sym
    534
    535 -def Symbolicate(command_args):
    536
    537      usage = "usage: %prog [options] <addr1> [addr2 ...]"
    538      description='''Symbolicate one or more addresses using LLDB's python scripting API..'''
    539      parser = optparse.OptionParser(description=description, prog='crashlog.py',usage=usage)
    540      parser.add_option('-v', '--verbose', action='store_true', dest='verbose', help='display verbose debug info', default=False)
    541      parser.add_option('-p', '--platform', type='string', metavar='platform', dest='platform', help='Specify the platform to use when creating the debug target. Valid values include "localhost", "darwin-kernel", "ios-simulator", "remote-freebsd", "remote-macosx", "remote-ios", "remote-linux".')
    542      parser.add_option('-f', '--file', type='string', metavar='file', dest='file', help='Specify a file to use when symbolicating')
    543      parser.add_option('-a', '--arch', type='string', metavar='arch', dest='arch', help='Specify a architecture to use when symbolicating')
    544      parser.add_option('-s', '--slide', type='int', metavar='slide', dest='slide', help='Specify the slide to use on the file specified with the --file option', default=None)
    545      parser.add_option('--section', type='string', action='append', dest='section_strings', help='specify <sect-name>=<start-addr> or <sect-name>=<start-addr>-<end-addr>')
    546      try:
    547          (options, args) = parser.parse_args(command_args)
    548      except:
    549          return
    550      symbolicator = Symbolicator()
    551      images = list();
    552      if options.file:
    553          image = Image(options.file);
    554          image.arch = options.arch
    555          # Add any sections that were specified with one or more --section options
    556          if options.section_strings:
    557              for section_str in options.section_strings:
    558                  section = Section()
    559                  if section.set_from_string (section_str):
    560                      image.add_section (section)
    561                  else:
    562                      sys.exit(1)
    563          if options.slide != None:
    564              image.slide = options.slide
    565          symbolicator.images.append(image)
    566
    567      target = symbolicator.create_target()
    568      if options.verbose:
    569          print symbolicator
    570      if target:
    571          for addr_str in args:
    572              addr = int(addr_str, 0)
    573              symbolicated_addrs = symbolicator.symbolicate(addr, options.verbose)
    574              for symbolicated_addr in symbolicated_addrs:
    575                  print symbolicated_addr
    576              print
    577      else:
    578          print 'error: no target for %s' % (symbolicator)
    579
    580  if __name__ == '__main__':
    581      # Create a new debugger instance
    582      lldb.debugger = lldb.SBDebugger.Create()
    583      Symbolicate (sys.argv[1:])
    584