gdb/testsuite/gdb.base/stap-probe.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2012-2020 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #if USE_SEMAPHORES
  19
  20 #define _SDT_HAS_SEMAPHORES
  21 __extension__ unsigned short test_user_semaphore __attribute__ ((unused)) __attribute__ ((section (".probes")));
  22 #define TEST test_user_semaphore
  23
  24 __extension__ unsigned short test_two_semaphore __attribute__ ((unused)) __attribute__ ((section (".probes")));
  25 #define TEST2 test_two_semaphore
  26
  27 __extension__ unsigned short test_m4_semaphore __attribute__ ((unused)) __attribute__ ((section (".probes")));
  28
  29 __extension__ unsigned short test_pstr_semaphore __attribute__ ((unused)) __attribute__ ((section (".probes")));
  30
  31 __extension__ unsigned short test_ps_semaphore __attribute__ ((unused)) __attribute__ ((section (".probes")));
  32 #else
  33
  34 int relocation_marker __attribute__ ((unused));
  35
  36 #define TEST 1
  37 #define TEST2 1
  38
  39 #endif
  40
  41 #include <sys/sdt.h>
  42
  43 /* We only support SystemTap and only the v3 form.  */
  44 #if _SDT_NOTE_TYPE != 3
  45 #error "not using SystemTap v3 probes"
  46 #endif
  47
  48 struct funcs
  49 {
  50   int val;
  51
  52   const char *(*ps) (int);
  53 };
  54
  55 static void
  56 m1 (void)
  57 {
  58   /* m1 and m2 are equivalent, but because of some compiler
  59      optimizations we have to make each of them unique.  This is why
  60      we have this dummy variable here.  */
  61   volatile int dummy = 0;
  62
  63   if (TEST2)
  64     STAP_PROBE1 (test, two, dummy);
  65 }
  66
  67 static void
  68 m2 (void)
  69 {
  70   if (TEST2)
  71     STAP_PROBE (test, two);
  72 }
  73
  74 static int
  75 f (int x)
  76 {
  77   if (TEST)
  78     STAP_PROBE1 (test, user, x);
  79   return x+5;
  80 }
  81
  82 static const char *
  83 pstr (int val)
  84 {
  85   const char *a = "This is a test message.";
  86   const char *b = "This is another test message.";
  87
  88   STAP_PROBE3 (test, ps, a, b, val);
  89
  90   return val == 0 ? a : b;
  91 }
  92
  93 static void
  94 m4 (const struct funcs *fs, int v)
  95 {
  96   STAP_PROBE3 (test, m4, fs->val, fs->ps (v), v);
  97 }
  98
  99 int
 100 main()
 101 {
 102   struct funcs fs;
 103
 104   fs.val = 42;
 105   fs.ps = pstr;
 106
 107   f (f (23));
 108   m1 ();
 109   m2 ();
 110
 111   m4 (&fs, 0);
 112   m4 (&fs, 1);
 113
 114   return 0; /* last break here */
 115 }