gold/testsuite/protected_1.cc

   1 // protected_1.cc -- a test case for gold
   2
   3 // Copyright (C) 2008-2021 Free Software Foundation, Inc.
   4 // Written by Ian Lance Taylor <iant@google.com>.
   5
   6 // This file is part of gold.
   7
   8 // This program is free software; you can redistribute it and/or modify
   9 // it under the terms of the GNU General Public License as published by
  10 // the Free Software Foundation; either version 3 of the License, or
  11 // (at your option) any later version.
  12
  13 // This program is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License
  19 // along with this program; if not, write to the Free Software
  20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21 // MA 02110-1301, USA.
  22
  23 // The function f1 is protected, which means that other callers in the
  24 // same shared library will call this version.
  25
  26 int
  27 f1() __attribute__ ((__visibility__ ("protected")));
  28
  29 int
  30 f1()
  31 {
  32   return 1;
  33 }
  34
  35 // The function f2 is used to test that the executable can see the
  36 // same function address for a protected function in the executable
  37 // and in the shared library.  We can't use the visibility attribute
  38 // here, becaues that may cause gcc to generate a PC relative reloc;
  39 // we need it to get the value from the GOT.  I'm not sure this is
  40 // really useful, given that it doesn't work with the visibility
  41 // attribute.  This test exists here mainly because the glibc
  42 // testsuite has the same test, and we want to make sure that gold
  43 // passes the glibc testsuite.
  44
  45 extern "C" int f2();
  46 asm(".protected f2");
  47
  48 extern "C" int
  49 f2()
  50 {
  51   return 2;
  52 }
  53
  54 int
  55 (*get_f2_addr())()
  56 {
  57   return f2;
  58 }