gold/testsuite/tls_test.cc

   1 // tls_test.cc -- test TLS variables for gold
   2
   3 // Copyright 2006, 2007, 2008 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 // 8  Like test 1, but with the thread variable defined in another file.
  42 // 9  Like test 3, but with the thread variable defined in another file.
  43 // 10 Like test 5, but with the thread variable defined in another file.
  44 // last  Verify that the above tests left the variables set correctly.
  45
  46
  47 #include <cstdio>
  48 #include "tls_test.h"
  49
  50 #define CHECK_EQ_OR_RETURN(var, expected)                               \
  51   do                                                                    \
  52     {                                                                   \
  53       if ((var) != (expected))                                          \
  54         {                                                               \
  55           printf(#var ": expected %d, found %d\n", expected, var);      \
  56           return false;                                                 \
  57         }                                                               \
  58     }                                                                   \
  59   while (0)
  60
  61 __thread int v1;
  62 static __thread int v2;
  63
  64 // We don't use these pointers, but putting them in tests alignment on
  65 // a 64-bit target.
  66 __thread char* p1;
  67 char dummy;
  68 __thread char* p2 = &dummy;
  69
  70 __thread int v3 = 3;
  71 static __thread int v4 = 4;
  72 __thread int v5;
  73 static __thread int v6;
  74
  75 bool
  76 t1()
  77 {
  78   CHECK_EQ_OR_RETURN(v1, 0);
  79   v1 = 10;
  80   return true;
  81 }
  82
  83 bool
  84 t2()
  85 {
  86   CHECK_EQ_OR_RETURN(v2, 0);
  87   v2 = 20;
  88   return true;
  89 }
  90
  91 bool
  92 t3()
  93 {
  94   CHECK_EQ_OR_RETURN(v3, 3);
  95   v3 = 30;
  96   return true;
  97 }
  98
  99 bool
 100 t4()
 101 {
 102   CHECK_EQ_OR_RETURN(v4, 4);
 103   v4 = 40;
 104   return true;
 105 }
 106
 107 // For test 5 the main function calls f5b(f5a()), then calls t5().
 108
 109 int*
 110 f5a()
 111 {
 112   return &v5;
 113 }
 114
 115 void
 116 f5b(int* p)
 117 {
 118   *p = 50;
 119 }
 120
 121 bool
 122 t5()
 123 {
 124   CHECK_EQ_OR_RETURN(v5, 50);
 125   return true;
 126 }
 127
 128 // For test 6 the main function calls f6b(f6a()), then calls t6().
 129
 130 int*
 131 f6a()
 132 {
 133   return &v6;
 134 }
 135
 136 void
 137 f6b(int* p)
 138 {
 139   *p = 60;
 140 }
 141
 142 bool
 143 t6()
 144 {
 145   CHECK_EQ_OR_RETURN(v6, 60);
 146   return true;
 147 }
 148
 149 // The slot for t7() is unused.
 150
 151 bool
 152 t8()
 153 {
 154   CHECK_EQ_OR_RETURN(o1, 0);
 155   o1 = -10;
 156   return true;
 157 }
 158
 159 bool
 160 t9()
 161 {
 162   CHECK_EQ_OR_RETURN(o2, -2);
 163   o2 = -20;
 164   return true;
 165 }
 166
 167 // For test 10 the main function calls f10b(f10a()), then calls t10().
 168
 169 int*
 170 f10a()
 171 {
 172   return &o3;
 173 }
 174
 175 void
 176 f10b(int* p)
 177 {
 178   *p = -30;
 179 }
 180
 181 bool
 182 t10()
 183 {
 184   CHECK_EQ_OR_RETURN(o3, -30);
 185   return true;
 186 }
 187
 188 bool
 189 t_last()
 190 {
 191   CHECK_EQ_OR_RETURN(v1, 10);
 192   CHECK_EQ_OR_RETURN(v2, 20);
 193   CHECK_EQ_OR_RETURN(v3, 30);
 194   CHECK_EQ_OR_RETURN(v4, 40);
 195   CHECK_EQ_OR_RETURN(v5, 50);
 196   CHECK_EQ_OR_RETURN(v6, 60);
 197   CHECK_EQ_OR_RETURN(o1, -10);
 198   CHECK_EQ_OR_RETURN(o2, -20);
 199   CHECK_EQ_OR_RETURN(o3, -30);
 200   return true;
 201 }