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

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2012-2019 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_PROBES
  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 #define TEST 1
  35 #define TEST2 1
  36
  37 #endif
  38
  39 #include <sys/sdt.h>
  40
  41 /* We only support SystemTap and only the v3 form.  */
  42 #if _SDT_NOTE_TYPE != 3
  43 #error "not using SystemTap v3 probes"
  44 #endif
  45
  46 struct funcs
  47 {
  48   int val;
  49
  50   const char *(*ps) (int);
  51 };
  52
  53 static void
  54 m1 (void)
  55 {
  56   /* m1 and m2 are equivalent, but because of some compiler
  57      optimizations we have to make each of them unique.  This is why
  58      we have this dummy variable here.  */
  59   volatile int dummy = 0;
  60
  61   if (TEST2)
  62     STAP_PROBE1 (test, two, dummy);
  63 }
  64
  65 static void
  66 m2 (void)
  67 {
  68   if (TEST2)
  69     STAP_PROBE (test, two);
  70 }
  71
  72 static int
  73 f (int x)
  74 {
  75   if (TEST)
  76     STAP_PROBE1 (test, user, x);
  77   return x+5;
  78 }
  79
  80 static const char *
  81 pstr (int val)
  82 {
  83   const char *a = "This is a test message.";
  84   const char *b = "This is another test message.";
  85
  86   STAP_PROBE3 (test, ps, a, b, val);
  87
  88   return val == 0 ? a : b;
  89 }
  90
  91 static void
  92 m4 (const struct funcs *fs, int v)
  93 {
  94   STAP_PROBE3 (test, m4, fs->val, fs->ps (v), v);
  95 }
  96
  97 int
  98 main()
  99 {
 100   struct funcs fs;
 101
 102   fs.val = 42;
 103   fs.ps = pstr;
 104
 105   f (f (23));
 106   m1 ();
 107   m2 ();
 108
 109   m4 (&fs, 0);
 110   m4 (&fs, 1);
 111
 112   return 0; /* last break here */
 113 }