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1#!/usr/bin/env python2
2"""Verify that a ChromeOS sub-tree was built with a particular compiler"""
3
4from __future__ import print_function
5
6import argparse
7import fnmatch
8import os
9import sys
10
11from cros_utils import command_executer
12
13COMPILERS = ['gcc', 'clang']
14
15COMPILER_STRINGS = {'gcc': 'GNU C', 'clang': 'clang version'}
16
17ERR_NO_DEBUG_INFO = 1024
18
19
20def UsageError(parser, message):
21  """Output error message and help/usage info."""
22
23  print('ERROR: %s' % message)
24  parser.print_help()
25  sys.exit(0)
26
27
28def CreateTmpDwarfFile(filename, dwarf_file, cmd_executer):
29  """Create temporary dwarfdump file, to be parsed later."""
30
31  cmd = ('readelf --debug-dump=info %s | grep -A5 DW_AT_producer > %s' %
32         (filename, dwarf_file))
33  retval = cmd_executer.RunCommand(cmd, print_to_console=False)
34  return retval
35
36
37def FindAllFiles(root_dir):
38  """Create a list of all the *.debug and *.dwp files to be checked."""
39
40  file_list = []
41  tmp_list = [
42      os.path.join(dirpath, f)
43      for dirpath, _, files in os.walk(root_dir)
44      for f in fnmatch.filter(files, '*.debug')
45  ]
46  for f in tmp_list:
47    if 'build-id' not in f:
48      file_list.append(f)
49  tmp_list = [
50      os.path.join(dirpath, f)
51      for dirpath, _, files in os.walk(root_dir)
52      for f in fnmatch.filter(files, '*.dwp')
53  ]
54  file_list += tmp_list
55  return file_list
56
57
58def VerifyArgs(compiler, filename, tmp_dir, root_dir, options, parser):
59  """Verify that the option values and combinations are valid."""
60
61  if options.filename and options.all_files:
62    UsageError(parser, 'Cannot use both --file and --all_files.')
63  if options.filename and options.root_dir:
64    UsageError(parser, 'Cannot use both --file and --root_dir.')
65  if options.all_files and not options.root_dir:
66    UsageError(parser, 'Missing --root_dir option.')
67  if options.root_dir and not options.all_files:
68    UsageError(parser, 'Missing --all_files option.')
69  if not options.filename and not options.all_files:
70    UsageError(parser, 'Must specify either --file or --all_files.')
71
72  # Verify that the values specified are valid.
73  if filename:
74    if not os.path.exists(filename):
75      UsageError(parser, 'Cannot find %s' % filename)
76  compiler = options.compiler.lower()
77  if compiler not in COMPILERS:
78    UsageError(parser, '%s is not a valid compiler (gcc or clang).' % compiler)
79  if root_dir and not os.path.exists(root_dir):
80    UsageError(parser, '%s does not exist.' % root_dir)
81  if not os.path.exists(tmp_dir):
82    os.makedirs(tmp_dir)
83
84
85def CheckFile(filename, compiler, tmp_dir, options, cmd_executer):
86  """Verify the information in a single file."""
87
88  print('Checking %s' % filename)
89  # Verify that file contains debug information.
90  cmd = 'readelf -SW %s | grep debug_info' % filename
91  retval = cmd_executer.RunCommand(cmd, print_to_console=False)
92  if retval != 0:
93    print('No debug info in this file. Unable to verify compiler.')
94    # There's no debug info in this file, so skip it.
95    return ERR_NO_DEBUG_INFO
96
97  tmp_name = os.path.basename(filename) + '.dwarf'
98  dwarf_file = os.path.join(tmp_dir, tmp_name)
99  status = CreateTmpDwarfFile(filename, dwarf_file, cmd_executer)
100
101  if status != 0:
102    print('Unable to create dwarf file for %s (status: %d).' % (filename,
103                                                                status))
104    return status
105
106  comp_str = COMPILER_STRINGS[compiler]
107
108  retval = 0
109  with open(dwarf_file, 'r') as in_file:
110    lines = in_file.readlines()
111    looking_for_name = False
112    for line in lines:
113      if 'DW_AT_producer' in line:
114        looking_for_name = False
115        if 'GNU AS' in line:
116          continue
117        if comp_str not in line:
118          looking_for_name = True
119          retval = 1
120      elif looking_for_name:
121        if 'DW_AT_name' in line:
122          words = line.split(':')
123          bad_file = words[-1]
124          print('FAIL:  %s was not compiled with %s.' % (bad_file.rstrip(),
125                                                         compiler))
126          looking_for_name = False
127        elif 'DW_TAG_' in line:
128          looking_for_name = False
129
130  if not options.keep_file:
131    os.remove(dwarf_file)
132
133  return retval
134
135
136def Main(argv):
137
138  cmd_executer = command_executer.GetCommandExecuter()
139  parser = argparse.ArgumentParser()
140  parser.add_argument(
141      '--file', dest='filename', help='Name of file to be verified.')
142  parser.add_argument(
143      '--compiler',
144      dest='compiler',
145      required=True,
146      help='Desired compiler (gcc or clang)')
147  parser.add_argument(
148      '--tmp_dir',
149      dest='tmp_dir',
150      help='Directory in which to put dwarf dump file.'
151      ' Defaults to /tmp')
152  parser.add_argument(
153      '--keep_file',
154      dest='keep_file',
155      default=False,
156      action='store_true',
157      help='Do not delete dwarf file when done.')
158  parser.add_argument(
159      '--all_files',
160      dest='all_files',
161      default=False,
162      action='store_true',
163      help='Find and check ALL .debug/.dwp files '
164      'in subtree.  Must be used with --root_dir '
165      '(and NOT with --file).')
166  parser.add_argument(
167      '--root_dir',
168      dest='root_dir',
169      help='Root of subtree in which to look for '
170      'files.  Must be used with --all_files, and'
171      ' not with --file.')
172
173  options = parser.parse_args(argv)
174
175  compiler = options.compiler
176  filename = None
177  if options.filename:
178    filename = os.path.realpath(os.path.expanduser(options.filename))
179  tmp_dir = '/tmp'
180  if options.tmp_dir:
181    tmp_dir = os.path.realpath(os.path.expanduser(options.tmp_dir))
182  root_dir = None
183  if options.root_dir:
184    root_dir = os.path.realpath(os.path.expanduser(options.root_dir))
185
186  VerifyArgs(compiler, filename, tmp_dir, root_dir, options, parser)
187
188  file_list = []
189  if filename:
190    file_list.append(filename)
191  else:
192    file_list = FindAllFiles(root_dir)
193
194  bad_files = []
195  unknown_files = []
196  all_pass = True
197  for f in file_list:
198    result = CheckFile(f, compiler, tmp_dir, options, cmd_executer)
199    if result == ERR_NO_DEBUG_INFO:
200      unknown_files.append(f)
201      all_pass = False
202    elif result != 0:
203      bad_files.append(f)
204      all_pass = False
205
206  if all_pass:
207    print('\n\nSUCCESS:  All compilation units were compiled with %s.\n' %
208          compiler)
209    return 0
210  else:
211    if len(bad_files) == 0:
212      print(
213          '\n\n*Mostly* SUCCESS: All files that could be checked were compiled '
214          'with %s.' % compiler)
215      print(
216          '\n\nUnable to verify the following files (no debug info in them):\n')
217      for f in unknown_files:
218        print(f)
219    else:
220      print('\n\nFAILED:  The following files were not compiled with %s:\n' %
221            compiler)
222      for f in bad_files:
223        print(f)
224      if len(unknown_files) > 0:
225        print('\n\nUnable to verify the following files (no debug info in '
226              'them):\n')
227        for f in unknown_files:
228          print(f)
229    return 1
230
231
232if __name__ == '__main__':
233  sys.exit(Main(sys.argv[1:]))
234