gold/testsuite/tls_test.cc

   1 // tls_test.cc -- test TLS variables for gold
   2
   3 // Copyright 2006, 2007 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 // This provides a set of test functions for TLS variables.  The
  24 // functions are called by a main function in tls_test_main.cc.  This
  25 // lets us test TLS access from a shared library.  We currently don't
  26 // bother to test TLS access between two different files, on the
  27 // theory that that is no more complicated than ordinary variable
  28 // access between files.
  29
  30 // We start two threads, and stop the second one.  Then we run the
  31 // first thread through the following cases.  Then we let the second
  32 // thread continue, and run it through the same set of cases.  All the
  33 // actual thread manipulation is in tls_test_main.cc.
  34
  35 // 1  Access to an uninitialized global thread variable.
  36 // 2  Access to an uninitialized static thread variable.
  37 // 3  Access to an initialized global thread variable.
  38 // 4  Access to an initialized static thread variable.
  39 // 5  Taking the address of a global thread variable.
  40 // 6  Taking the address of a static thread variable.
  41 // 7  Verify that the above tests left the variables set correctly.
  42
  43 #include "tls_test.h"
  44
  45 __thread int v1;
  46 static __thread int v2;
  47 __thread int v3 = 3;
  48 static __thread int v4 = 4;
  49 __thread int v5;
  50 static __thread int v6;
  51
  52 bool
  53 t1()
  54 {
  55   if (v1 != 0)
  56     return false;
  57   v1 = 10;
  58   return true;
  59 }
  60
  61 bool
  62 t2()
  63 {
  64   if (v2 != 0)
  65     return false;
  66   v2 = 20;
  67   return true;
  68 }
  69
  70 bool
  71 t3()
  72 {
  73   if (v3 != 3)
  74     return false;
  75   v3 = 30;
  76   return true;
  77 }
  78
  79 bool
  80 t4()
  81 {
  82   if (v4 != 4)
  83     return false;
  84   v4 = 40;
  85   return true;
  86 }
  87
  88 // For test 5 the main function calls f5b(f5a()), then calls t5().
  89
  90 int*
  91 f5a()
  92 {
  93   return &v5;
  94 }
  95
  96 void
  97 f5b(int* p)
  98 {
  99   *p = 50;
 100 }
 101
 102 bool
 103 t5()
 104 {
 105   return v5 == 50;
 106 }
 107
 108 // For test 5 the main function calls f6b(f6a()), then calls t6().
 109
 110 int*
 111 f6a()
 112 {
 113   return &v6;
 114 }
 115
 116 void
 117 f6b(int* p)
 118 {
 119   *p = 60;
 120 }
 121
 122 bool
 123 t6()
 124 {
 125   return v6 == 60;
 126 }
 127
 128 bool
 129 t7()
 130 {
 131   return (v1 == 10
 132           && v2 == 20
 133           && v3 == 30
 134           && v4 == 40
 135           && v5 == 50
 136           && v6 == 60);
 137 }