1 # Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
2 # Use of this source code is governed by a BSD-style license that can be
3 # found in the LICENSE file.
5 """Generate minidump symbols for use by the Crash server.
7 Note: This should be run inside the chroot.
9 This produces files in the breakpad format required by minidump_stackwalk and
10 the crash server to dump stack information.
12 Basically it scans all the split .debug files in /build/$BOARD/usr/lib/debug/
13 and converts them over using the `dump_syms` programs. Those plain text .sym
14 files are then stored in /build/$BOARD/usr/lib/debug/breakpad/.
16 If you want to actually upload things, see upload_symbols.py.
22 import multiprocessing
26 from chromite.lib import commandline
27 from chromite.lib import cros_build_lib
28 from chromite.lib import osutils
29 from chromite.lib import parallel
32 SymbolHeader = collections.namedtuple('SymbolHeader',
33 ('cpu', 'id', 'name', 'os',))
36 def ReadSymsHeader(sym_file):
37 """Parse the header of the symbol file
39 The first line of the syms file will read like:
40 MODULE Linux arm F4F6FA6CCBDEF455039C8DE869C8A2F40 blkid
42 https://code.google.com/p/google-breakpad/wiki/SymbolFiles
45 sym_file: The symbol file to parse
51 ValueError if the first line of |sym_file| is invalid
53 with cros_build_lib.Open(sym_file) as f:
54 header = f.readline().split()
56 if header[0] != 'MODULE' or len(header) != 5:
57 raise ValueError('header of sym file is invalid')
59 return SymbolHeader(os=header[1], cpu=header[2], id=header[3], name=header[4])
62 def GenerateBreakpadSymbol(elf_file, debug_file=None, breakpad_dir=None,
63 board=None, strip_cfi=False, num_errors=None):
64 """Generate the symbols for |elf_file| using |debug_file|
67 elf_file: The file to dump symbols for
68 debug_file: Split debug file to use for symbol information
69 breakpad_dir: The dir to store the output symbol file in
70 board: If |breakpad_dir| is not specified, use |board| to find it
71 strip_cfi: Do not generate CFI data
72 num_errors: An object to update with the error count (needs a .value member)
75 The number of errors that were encountered.
77 if breakpad_dir is None:
78 breakpad_dir = FindBreakpadDir(board)
79 if num_errors is None:
80 num_errors = ctypes.c_int()
82 cmd_base = ['dump_syms']
85 # Some files will not be readable by non-root (e.g. set*id /bin/su).
86 needs_sudo = not os.access(elf_file, os.R_OK)
88 def _DumpIt(cmd_args):
90 run_command = cros_build_lib.SudoRunCommand
92 run_command = cros_build_lib.RunCommand
94 cmd_base + cmd_args, redirect_stderr=True, log_stdout_to_file=temp.name,
95 error_code_ok=True, debug_level=logging.DEBUG)
97 def _CrashCheck(ret, msg):
99 cros_build_lib.PrintBuildbotStepWarnings()
100 cros_build_lib.Warning('dump_syms crashed with %s; %s',
101 osutils.StrSignal(-ret), msg)
103 osutils.SafeMakedirs(breakpad_dir)
104 with tempfile.NamedTemporaryFile(dir=breakpad_dir, bufsize=0) as temp:
106 # Try to dump the symbols using the debug file like normal.
107 cmd_args = [elf_file, os.path.dirname(debug_file)]
108 result = _DumpIt(cmd_args)
110 if result.returncode:
111 # Sometimes dump_syms can crash because there's too much info.
112 # Try dumping and stripping the extended stuff out. At least
113 # this way we'll get the extended symbols. http://crbug.com/266064
114 _CrashCheck(result.returncode, 'retrying w/out CFI')
115 cmd_args = ['-c', '-r'] + cmd_args
116 result = _DumpIt(cmd_args)
117 _CrashCheck(result.returncode, 'retrying w/out debug')
119 basic_dump = result.returncode
124 # If that didn't work (no debug, or dump_syms still failed), try
125 # dumping just the file itself directly.
126 result = _DumpIt([elf_file])
127 if result.returncode:
128 # A lot of files (like kernel files) contain no debug information,
129 # do not consider such occurrences as errors.
130 cros_build_lib.PrintBuildbotStepWarnings()
131 _CrashCheck(result.returncode, 'giving up entirely')
132 if 'file contains no debugging information' in result.error:
133 cros_build_lib.Warning('no symbols found for %s', elf_file)
135 num_errors.value += 1
136 cros_build_lib.Error('dumping symbols for %s failed:\n%s',
137 elf_file, result.error)
138 return num_errors.value
140 # Move the dumped symbol file to the right place:
141 # /build/$BOARD/usr/lib/debug/breakpad/<module-name>/<id>/<module-name>.sym
142 header = ReadSymsHeader(temp)
143 cros_build_lib.Info('Dumped %s as %s : %s', elf_file, header.name,
145 sym_file = os.path.join(breakpad_dir, header.name, header.id,
146 header.name + '.sym')
147 osutils.SafeMakedirs(os.path.dirname(sym_file))
148 os.rename(temp.name, sym_file)
149 os.chmod(sym_file, 0o644)
152 return num_errors.value
155 def GenerateBreakpadSymbols(board, breakpad_dir=None, strip_cfi=False,
156 generate_count=None, sysroot=None,
157 num_processes=None, clean_breakpad=False,
158 exclude_dirs=(), file_list=None):
159 """Generate symbols for this board.
161 If |file_list| is None, symbols are generated for all executables, otherwise
162 only for the files included in |file_list|.
165 This should be merged with buildbot_commands.GenerateBreakpadSymbols()
166 once we rewrite cros_generate_breakpad_symbols in python.
169 board: The board whose symbols we wish to generate
170 breakpad_dir: The full path to the breakpad directory where symbols live
171 strip_cfi: Do not generate CFI data
172 generate_count: If set, only generate this many symbols (meant for testing)
173 sysroot: The root where to find the corresponding ELFs
174 num_processes: Number of jobs to run in parallel
175 clean_breakpad: Should we `rm -rf` the breakpad output dir first; note: we
176 do not do any locking, so do not run more than one in parallel when True
177 exclude_dirs: List of dirs (relative to |sysroot|) to not search
178 file_list: Only generate symbols for files in this list. Each file must be a
179 full path (including |sysroot| prefix).
180 TODO(build): Support paths w/o |sysroot|.
183 The number of errors that were encountered.
185 if breakpad_dir is None:
186 breakpad_dir = FindBreakpadDir(board)
188 sysroot = cros_build_lib.GetSysroot(board=board)
190 cros_build_lib.Info('cleaning out %s first', breakpad_dir)
191 osutils.RmDir(breakpad_dir, ignore_missing=True, sudo=True)
192 # Make sure non-root can write out symbols as needed.
193 osutils.SafeMakedirs(breakpad_dir, sudo=True)
194 if not os.access(breakpad_dir, os.W_OK):
195 cros_build_lib.SudoRunCommand(['chown', '-R', str(os.getuid()),
197 debug_dir = FindDebugDir(board)
198 exclude_paths = [os.path.join(debug_dir, x) for x in exclude_dirs]
199 if file_list is None:
201 file_filter = dict.fromkeys([os.path.normpath(x) for x in file_list], False)
203 cros_build_lib.Info('generating breakpad symbols using %s', debug_dir)
205 # Let's locate all the debug_files and elfs first along with the debug file
206 # sizes. This way we can start processing the largest files first in parallel
207 # with the small ones.
208 # If |file_list| was given, ignore all other files.
210 for root, dirs, files in os.walk(debug_dir):
211 if root in exclude_paths:
212 cros_build_lib.Info('Skipping excluded dir %s', root)
216 for debug_file in files:
217 debug_file = os.path.join(root, debug_file)
218 # Turn /build/$BOARD/usr/lib/debug/sbin/foo.debug into
219 # /build/$BOARD/sbin/foo.
220 elf_file = os.path.join(sysroot, debug_file[len(debug_dir) + 1:-6])
223 if elf_file in file_filter:
224 file_filter[elf_file] = True
225 elif debug_file in file_filter:
226 file_filter[debug_file] = True
230 # Filter out files based on common issues with the debug file.
231 if not debug_file.endswith('.debug'):
234 elif debug_file.endswith('.ko.debug'):
235 cros_build_lib.Debug('Skipping kernel module %s', debug_file)
238 elif os.path.islink(debug_file):
239 # The build-id stuff is common enough to filter out by default.
240 if '/.build-id/' in debug_file:
241 msg = cros_build_lib.Debug
243 msg = cros_build_lib.Warning
244 msg('Skipping symbolic link %s', debug_file)
247 # Filter out files based on common issues with the elf file.
248 if not os.path.exists(elf_file):
249 # Sometimes we filter out programs from /usr/bin but leave behind
251 cros_build_lib.Warning('Skipping missing %s', elf_file)
254 targets.append((os.path.getsize(debug_file), elf_file, debug_file))
256 bg_errors = multiprocessing.Value('i')
258 files_not_found = [x for x, found in file_filter.iteritems() if not found]
259 bg_errors.value += len(files_not_found)
261 cros_build_lib.Error('Failed to find requested files: %s',
264 # Now start generating symbols for the discovered elfs.
265 with parallel.BackgroundTaskRunner(GenerateBreakpadSymbol,
266 breakpad_dir=breakpad_dir, board=board,
268 num_errors=bg_errors,
269 processes=num_processes) as queue:
270 for _, elf_file, debug_file in sorted(targets, reverse=True):
271 if generate_count == 0:
274 queue.put([elf_file, debug_file])
275 if generate_count is not None:
277 if generate_count == 0:
280 return bg_errors.value
283 def FindDebugDir(board):
284 """Given a |board|, return the path to the split debug dir for it"""
285 sysroot = cros_build_lib.GetSysroot(board=board)
286 return os.path.join(sysroot, 'usr', 'lib', 'debug')
289 def FindBreakpadDir(board):
290 """Given a |board|, return the path to the breakpad dir for it"""
291 return os.path.join(FindDebugDir(board), 'breakpad')
295 parser = commandline.ArgumentParser(description=__doc__)
297 parser.add_argument('--board', default=None,
298 help='board to generate symbols for')
299 parser.add_argument('--breakpad_root', type='path', default=None,
300 help='root directory for breakpad symbols')
301 parser.add_argument('--exclude-dir', type=str, action='append',
303 help='directory (relative to |board| root) to not search')
304 parser.add_argument('--generate-count', type=int, default=None,
305 help='only generate # number of symbols')
306 parser.add_argument('--noclean', dest='clean', action='store_false',
308 help='do not clean out breakpad dir before running')
309 parser.add_argument('--jobs', type=int, default=None,
310 help='limit number of parallel jobs')
311 parser.add_argument('--strip_cfi', action='store_true', default=False,
312 help='do not generate CFI data (pass -c to dump_syms)')
313 parser.add_argument('file_list', nargs='*', default=None,
314 help='generate symbols for only these files '
315 '(e.g. /build/$BOARD/usr/bin/foo)')
317 opts = parser.parse_args(argv)
320 if opts.board is None:
321 cros_build_lib.Die('--board is required')
323 ret = GenerateBreakpadSymbols(opts.board, breakpad_dir=opts.breakpad_root,
324 strip_cfi=opts.strip_cfi,
325 generate_count=opts.generate_count,
326 num_processes=opts.jobs,
327 clean_breakpad=opts.clean,
328 exclude_dirs=opts.exclude_dir,
329 file_list=opts.file_list)
331 cros_build_lib.Error('encountered %i problem(s)', ret)
332 # Since exit(status) gets masked, clamp it to 1 so we don't inadvertently
333 # return 0 in case we are a multiple of the mask.