gdb/contrib/test_pubnames_and_indexes.py

   1 #! /usr/bin/env python3
   2
   3 # Copyright (C) 2011-2022 Free Software Foundation, Inc.
   4 #
   5 # This file is part of GDB.
   6 #
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 # This program requires readelf, gdb and objcopy.  The default values are gdb
  21 # from the build tree and objcopy and readelf from $PATH.  They may be
  22 # overridden by setting environment variables GDB, READELF and OBJCOPY
  23 # respectively.  We assume the current directory is either $obj/gdb or
  24 # $obj/gdb/testsuite.
  25 #
  26 # Example usage:
  27 #
  28 # bash$ cd $objdir/gdb/testsuite
  29 # bash$ python test_pubnames_and_indexes.py <binary_name>
  30
  31 """test_pubnames_and_indexes.py
  32
  33 Test that the gdb_index produced by gold is identical to the gdb_index
  34 produced by gdb itself.
  35
  36 Further check that the pubnames and pubtypes produced by gcc are identical
  37 to those that gdb produces.
  38
  39 Finally, check that all strings are canonicalized identically.
  40 """
  41
  42 __author__ = "saugustine@google.com (Sterling Augustine)"
  43
  44 import os
  45 import subprocess
  46 import sys
  47
  48 OBJCOPY = None
  49 READELF = None
  50 GDB = None
  51
  52
  53 def get_pub_info(filename, readelf_option):
  54     """Parse and return all the pubnames or pubtypes produced by readelf with the
  55     given option.
  56     """
  57     readelf = subprocess.Popen(
  58         [READELF, "--debug-dump=" + readelf_option, filename], stdout=subprocess.PIPE
  59     )
  60     pubnames = []
  61
  62     in_list = False
  63     for line in readelf.stdout:
  64         fields = line.split(None, 1)
  65         if len(fields) == 2 and fields[0] == "Offset" and fields[1].strip() == "Name":
  66             in_list = True
  67         # Either a blank-line or a new Length field terminates the current section.
  68         elif len(fields) == 0 or fields[0] == "Length:":
  69             in_list = False
  70         elif in_list:
  71             pubnames.append(fields[1].strip())
  72
  73     readelf.wait()
  74     return pubnames
  75
  76
  77 def get_gdb_index(filename):
  78     """Use readelf to dump the gdb index and collect the types and names"""
  79     readelf = subprocess.Popen(
  80         [READELF, "--debug-dump=gdb_index", filename], stdout=subprocess.PIPE
  81     )
  82     index_symbols = []
  83     symbol_table_started = False
  84     for line in readelf.stdout:
  85         if line == "Symbol table:\n":
  86             symbol_table_started = True
  87         elif symbol_table_started:
  88             # Readelf prints gdb-index lines formatted like so:
  89             # [  4] two::c2<double>::c2: 0
  90             # So take the string between the first close bracket and the last colon.
  91             index_symbols.append(line[line.find("]") + 2 : line.rfind(":")])
  92
  93     readelf.wait()
  94     return index_symbols
  95
  96
  97 def CheckSets(list0, list1, name0, name1):
  98     """Report any setwise differences between the two lists"""
  99
 100     if len(list0) == 0 or len(list1) == 0:
 101         return False
 102
 103     difference0 = set(list0) - set(list1)
 104     if len(difference0) != 0:
 105         print("Elements in " + name0 + " but not " + name1 + ": (", end=" ")
 106         print(len(difference0), end=" ")
 107         print(")")
 108         for element in difference0:
 109             print("  " + element)
 110
 111     difference1 = set(list1) - set(list0)
 112     if len(difference1) != 0:
 113         print("Elements in " + name1 + " but not " + name0 + ": (", end=" ")
 114         print(len(difference1), end=" ")
 115         print(")")
 116         for element in difference1:
 117             print("  " + element)
 118
 119     if len(difference0) != 0 or len(difference1) != 0:
 120         return True
 121
 122     print(name0 + " and " + name1 + " are identical.")
 123     return False
 124
 125
 126 def find_executables():
 127     """Find the copies of readelf, objcopy and gdb to use."""
 128     # Executable finding logic follows cc-with-index.sh
 129     global READELF
 130     READELF = os.getenv("READELF")
 131     if READELF is None:
 132         READELF = "readelf"
 133     global OBJCOPY
 134     OBJCOPY = os.getenv("OBJCOPY")
 135     if OBJCOPY is None:
 136         OBJCOPY = "objcopy"
 137
 138     global GDB
 139     GDB = os.getenv("GDB")
 140     if GDB is None:
 141         if os.path.isfile("./gdb") and os.access("./gdb", os.X_OK):
 142             GDB = "./gdb"
 143         elif os.path.isfile("../gdb") and os.access("../gdb", os.X_OK):
 144             GDB = "../gdb"
 145         elif os.path.isfile("../../gdb") and os.access("../../gdb", os.X_OK):
 146             GDB = "../../gdb"
 147         else:
 148             # Punt and use the gdb in the path.
 149             GDB = "gdb"
 150
 151
 152 def main(argv):
 153     """The main subprogram."""
 154     if len(argv) != 2:
 155         print("Usage: test_pubnames_and_indexes.py <filename>")
 156         sys.exit(2)
 157
 158     find_executables()
 159
 160     # Get the index produced by Gold--It should have been built into the binary.
 161     gold_index = get_gdb_index(argv[1])
 162
 163     # Collect the pubnames and types list
 164     pubs_list = get_pub_info(argv[1], "pubnames")
 165     pubs_list = pubs_list + get_pub_info(argv[1], "pubtypes")
 166
 167     # Generate a .gdb_index with gdb
 168     gdb_index_file = argv[1] + ".gdb-generated-index"
 169     subprocess.check_call(
 170         [OBJCOPY, "--remove-section", ".gdb_index", argv[1], gdb_index_file]
 171     )
 172     subprocess.check_call(
 173         [
 174             GDB,
 175             "-batch",
 176             "-nx",
 177             gdb_index_file,
 178             "-ex",
 179             "save gdb-index " + os.path.dirname(argv[1]),
 180             "-ex",
 181             "quit",
 182         ]
 183     )
 184     subprocess.check_call(
 185         [
 186             OBJCOPY,
 187             "--add-section",
 188             ".gdb_index=" + gdb_index_file + ".gdb-index",
 189             gdb_index_file,
 190         ]
 191     )
 192     gdb_index = get_gdb_index(gdb_index_file)
 193     os.remove(gdb_index_file)
 194     os.remove(gdb_index_file + ".gdb-index")
 195
 196     failed = False
 197     gdb_index.sort()
 198     gold_index.sort()
 199     pubs_list.sort()
 200
 201     # Find the differences between the various indices.
 202     if len(gold_index) == 0:
 203         print("Gold index is empty")
 204         failed |= True
 205
 206     if len(gdb_index) == 0:
 207         print("Gdb index is empty")
 208         failed |= True
 209
 210     if len(pubs_list) == 0:
 211         print("Pubs list is empty")
 212         failed |= True
 213
 214     failed |= CheckSets(gdb_index, gold_index, "gdb index", "gold index")
 215     failed |= CheckSets(pubs_list, gold_index, "pubs list", "gold index")
 216     failed |= CheckSets(pubs_list, gdb_index, "pubs list", "gdb index")
 217
 218     if failed:
 219         print("Test failed")
 220         sys.exit(1)
 221
 222
 223 if __name__ == "__main__":
 224     main(sys.argv)