2012-04-26 Sterling Augustine <saugustine@google.com>

	* contrib: New directory.
	* contrib/test_pubnames_and_indexes.py: New file.

1 files changed, 207 insertions, 0 deletions

diff --git a/gdb/contrib/test_pubnames_and_indexes.py b/gdb/contrib/test_pubnames_and_indexes.py
new file mode 100644
index 0000000..12d6d6d
--- /dev/null
+++ b/gdb/contrib/test_pubnames_and_indexes.py
@@ -0,0 +1,207 @@
+#! /usr/bin/env python
+
+# Copyright (C) 2011-2012 Free Software Foundation, Inc.
+#
+# This file is part of GDB.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# This program requires readelf, gdb and objcopy.  The default values are gdb
+# from the build tree and objcopy and readelf from $PATH.  They may be
+# overridden by setting environment variables GDB, READELF and OBJCOPY
+# respectively.  We assume the current directory is either $obj/gdb or
+# $obj/gdb/testsuite.
+#
+# Example usage:
+#
+# bash$ cd $objdir/gdb/testsuite
+# bash$ python test_pubnames_and_indexes.py <binary_name>
+
+"""test_pubnames_and_indexes.py
+
+Test that the gdb_index produced by gold is identical to the gdb_index
+produced by gdb itself.
+
+Further check that the pubnames and pubtypes produced by gcc are identical
+to those that gdb produces.
+
+Finally, check that all strings are canonicalized identically.
+"""
+
+__author__ = 'saugustine@google.com (Sterling Augustine)'
+
+import os
+import subprocess
+import sys
+
+OBJCOPY = None
+READELF = None
+GDB = None
+
+def get_pub_info(filename, readelf_option):
+  """Parse and return all the pubnames or pubtypes produced by readelf with the
+  given option.
+  """
+  readelf = subprocess.Popen([READELF, '--debug-dump=' + readelf_option,
+                                       filename], stdout=subprocess.PIPE)
+  pubnames = []
+
+  in_list = False;
+  for line in readelf.stdout:
+    fields = line.split(None, 1)
+    if (len(fields) == 2 and fields[0] == 'Offset'
+        and fields[1].strip() == 'Name'):
+      in_list = True
+    # Either a blank-line or a new Length field terminates the current section.
+    elif (len(fields) == 0 or fields[0] == 'Length:'):
+      in_list = False;
+    elif (in_list):
+      pubnames.append(fields[1].strip())
+
+  readelf.wait()
+  return pubnames
+
+
+def get_gdb_index(filename):
+  """Use readelf to dump the gdb index and collect the types and names"""
+  readelf = subprocess.Popen([READELF, '--debug-dump=gdb_index',
+                              filename], stdout=subprocess.PIPE)
+  index_symbols = []
+  symbol_table_started = False
+  for line in readelf.stdout:
+    if (line == 'Symbol table:\n'):
+      symbol_table_started = True;
+    elif (symbol_table_started):
+      # Readelf prints gdb-index lines formatted like so:
+      # [  4] two::c2<double>::c2: 0
+      # So take the string between the first close bracket and the last colon.
+      index_symbols.append(line[line.find(']') + 2: line.rfind(':')])
+
+  readelf.wait()
+  return index_symbols
+
+
+def CheckSets(list0, list1, name0, name1):
+  """Report any setwise differences between the two lists"""
+
+  if len(list0) == 0 or len(list1) == 0:
+    return False
+
+  difference0 = set(list0) - set(list1)
+  if len(difference0) != 0:
+    print "Elements in " + name0 + " but not " + name1 + ": (",
+    print len(difference0),
+    print ")"
+    for element in difference0:
+      print "  " + element
+
+  difference1 = set(list1) - set(list0)
+  if len(difference1) != 0:
+    print "Elements in " + name1 + " but not " + name0 + ": (",
+    print len(difference1),
+    print ")"
+    for element in difference1:
+      print "  " + element
+
+  if (len(difference0) != 0 or len(difference1) != 0):
+    return True
+
+  print name0 + " and " + name1 + " are identical."
+  return False
+
+
+def find_executables():
+  """Find the copies of readelf, objcopy and gdb to use."""
+  # Executable finding logic follows cc-with-index.sh
+  global READELF
+  READELF = os.getenv('READELF')
+  if READELF is None:
+    READELF = 'readelf'
+  global OBJCOPY
+  OBJCOPY = os.getenv('OBJCOPY')
+  if OBJCOPY is None:
+    OBJCOPY = 'objcopy'
+
+  global GDB
+  GDB = os.getenv('GDB')
+  if (GDB is None):
+    if os.path.isfile('./gdb') and os.access('./gdb', os.X_OK):
+      GDB = './gdb'
+    elif os.path.isfile('../gdb') and os.access('../gdb', os.X_OK):
+      GDB = '../gdb'
+    elif os.path.isfile('../../gdb') and os.access('../../gdb', os.X_OK):
+      GDB = '../../gdb'
+    else:
+      # Punt and use the gdb in the path.
+      GDB = 'gdb'
+
+
+def main(argv):
+  """The main subprogram."""
+  if len(argv) != 2:
+    print "Usage: test_pubnames_and_indexes.py <filename>"
+    sys.exit(2)
+
+  find_executables();
+
+  # Get the index produced by Gold--It should have been built into the binary.
+  gold_index = get_gdb_index(argv[1])
+
+  # Collect the pubnames and types list
+  pubs_list = get_pub_info(argv[1], "pubnames")
+  pubs_list = pubs_list + get_pub_info(argv[1], "pubtypes")
+
+  # Generate a .gdb_index with gdb
+  gdb_index_file = argv[1] + '.gdb-generated-index'
+  subprocess.check_call([OBJCOPY, '--remove-section', '.gdb_index',
+                         argv[1], gdb_index_file])
+  subprocess.check_call([GDB, '-batch', '-nx', gdb_index_file,
+                         '-ex', 'save gdb-index ' + os.path.dirname(argv[1]),
+                         '-ex', 'quit'])
+  subprocess.check_call([OBJCOPY, '--add-section',
+                         '.gdb_index=' + gdb_index_file + '.gdb-index',
+                         gdb_index_file])
+  gdb_index = get_gdb_index(gdb_index_file)
+  os.remove(gdb_index_file)
+  os.remove(gdb_index_file + '.gdb-index')
+
+  failed = False
+  gdb_index.sort()
+  gold_index.sort()
+  pubs_list.sort()
+
+  # Find the differences between the various indices.
+  if len(gold_index) == 0:
+    print "Gold index is empty"
+    failed |= True
+
+  if len(gdb_index) == 0:
+    print "Gdb index is empty"
+    failed |= True
+
+  if len(pubs_list) == 0:
+    print "Pubs list is empty"
+    failed |= True
+
+  failed |= CheckSets(gdb_index, gold_index, "gdb index", "gold index")
+  failed |= CheckSets(pubs_list, gold_index, "pubs list", "gold index")
+  failed |= CheckSets(pubs_list, gdb_index, "pubs list", "gdb index")
+
+  if failed:
+    print "Test failed"
+    sys.exit(1)
+
+
+if __name__ == '__main__':
+  main(sys.argv)