1 files changed, 85 insertions, 0 deletions
diff --git a/tools/find_runtime_symbols/reduce_debugline.py b/tools/find_runtime_symbols/reduce_debugline.py
new file mode 100755
index 0000000..1a4efaa
--- /dev/null
+++ b/tools/find_runtime_symbols/reduce_debugline.py
@@ -0,0 +1,85 @@
+#!/usr/bin/env python
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+"""Reduces result of 'readelf -wL' to just a set of address ranges per file.
+
+For example:
+
+CU: ../../chrome_main.cc:
+File name                            Line number    Starting address
+chrome_main.cc                                30            0xa3be90
+(an empty line)
+chrome_main.cc                                31            0xa3bea3
+chrome_main.cc                                32            0xa3beaf
+chrome_main.cc                                34            0xa3bec9
+chrome_main.cc                                32            0xa3bed1
+(an empty line)
+
+The example above is reduced into:
+{'../../chrome_main.cc', [(0xa3be90, 0xa3be90), (0xa3bea3, 0xa3bed1)]}
+where (0xa3bea3, 0xa3bed1) means an address range from 0xa3bea3 to 0xa3bed1.
+
+This script assumes that the result of 'readelf -wL' ends with an empty line.
+
+Note: the option '-wL' has the same meaning with '--debug-dump=decodedline'.
+"""
+
+import re
+import sys
+
+
+_FILENAME_PATTERN = re.compile('(CU: |)(.+)\:')
+
+
+def reduce_decoded_debugline(input_file):
+  filename = ''
+  ranges_dict = {}
+  starting = None
+  ending = None
+
+  for line in input_file:
+    line = line.strip()
+
+    if line.endswith(':'):
+      matched = _FILENAME_PATTERN.match(line)
+      if matched:
+        filename = matched.group(2)
+      continue
+
+    unpacked = line.split(None, 2)
+    if len(unpacked) != 3 or not unpacked[2].startswith('0x'):
+      if starting:
+        ranges_dict.setdefault(filename, []).append((starting, ending))
+        starting = None
+        ending = None
+      continue
+
+    ending = int(unpacked[2], 16)
+    if not starting:
+      starting = ending
+
+  if starting or ending:
+    raise ValueError('No new line at last.')
+
+  return ranges_dict
+
+
+def main():
+  if len(sys.argv) != 1:
+    print >> sys.stderr, 'Unsupported arguments'
+    return 1
+
+  ranges_dict = reduce_decoded_debugline(sys.stdin)
+  for filename, ranges in ranges_dict.iteritems():
+    print filename + ':'
+    prev = (0, 0)
+    for address_range in sorted(ranges):
+      if address_range == prev:
+        continue
+      print ' %x-%x' % (address_range[0], address_range[1])
+      prev = address_range
+
+
+if __name__ == '__main__':
+  sys.exit(main())