gdb/gdbarch-selftests.c

   1 /* Self tests for gdbarch for GDB, the GNU debugger.
   2
   3    Copyright (C) 2017-2018 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #if GDB_SELF_TEST
  22 #include "selftest.h"
  23 #include "selftest-arch.h"
  24 #include "inferior.h"
  25 #include "gdbthread.h"
  26 #include "target.h"
  27 #include "target-float.h"
  28 #include "common/def-vector.h"
  29
  30 namespace selftests {
  31
  32 /* Test gdbarch methods register_to_value and value_to_register.  */
  33
  34 static void
  35 register_to_value_test (struct gdbarch *gdbarch)
  36 {
  37   const struct builtin_type *builtin = builtin_type (gdbarch);
  38   struct type *types[] =
  39     {
  40       builtin->builtin_void,
  41       builtin->builtin_char,
  42       builtin->builtin_short,
  43       builtin->builtin_int,
  44       builtin->builtin_long,
  45       builtin->builtin_signed_char,
  46       builtin->builtin_unsigned_short,
  47       builtin->builtin_unsigned_int,
  48       builtin->builtin_unsigned_long,
  49       builtin->builtin_float,
  50       builtin->builtin_double,
  51       builtin->builtin_long_double,
  52       builtin->builtin_complex,
  53       builtin->builtin_double_complex,
  54       builtin->builtin_string,
  55       builtin->builtin_bool,
  56       builtin->builtin_long_long,
  57       builtin->builtin_unsigned_long_long,
  58       builtin->builtin_int8,
  59       builtin->builtin_uint8,
  60       builtin->builtin_int16,
  61       builtin->builtin_uint16,
  62       builtin->builtin_int32,
  63       builtin->builtin_uint32,
  64       builtin->builtin_int64,
  65       builtin->builtin_uint64,
  66       builtin->builtin_int128,
  67       builtin->builtin_uint128,
  68       builtin->builtin_char16,
  69       builtin->builtin_char32,
  70     };
  71
  72   /* Error out if debugging something, because we're going to push the
  73      test target, which would pop any existing target.  */
  74   if (target_stack->to_stratum >= process_stratum)
  75    error (_("target already pushed"));
  76
  77   /* Create a mock environment.  An inferior with a thread, with a
  78      process_stratum target pushed.  */
  79
  80   test_target_ops mock_target;
  81   ptid_t mock_ptid (1, 1);
  82   inferior mock_inferior (mock_ptid.pid ());
  83   address_space mock_aspace {};
  84   mock_inferior.gdbarch = gdbarch;
  85   mock_inferior.aspace = &mock_aspace;
  86   thread_info mock_thread (&mock_inferior, mock_ptid);
  87
  88   scoped_restore restore_thread_list
  89     = make_scoped_restore (&thread_list, &mock_thread);
  90
  91   /* Add the mock inferior to the inferior list so that look ups by
  92      target+ptid can find it.  */
  93   scoped_restore restore_inferior_list
  94     = make_scoped_restore (&inferior_list);
  95   inferior_list = &mock_inferior;
  96
  97   /* Switch to the mock inferior.  */
  98   scoped_restore_current_inferior restore_current_inferior;
  99   set_current_inferior (&mock_inferior);
 100
 101   /* Push the process_stratum target so we can mock accessing
 102      registers.  */
 103   push_target (&mock_target);
 104
 105   /* Pop it again on exit (return/exception).  */
 106   struct on_exit
 107   {
 108     ~on_exit ()
 109     {
 110       pop_all_targets_at_and_above (process_stratum);
 111     }
 112   } pop_targets;
 113
 114   /* Switch to the mock thread.  */
 115   scoped_restore restore_inferior_ptid
 116     = make_scoped_restore (&inferior_ptid, mock_ptid);
 117
 118   struct frame_info *frame = get_current_frame ();
 119   const int num_regs = (gdbarch_num_regs (gdbarch)
 120                         + gdbarch_num_pseudo_regs (gdbarch));
 121
 122   /* Test gdbarch methods register_to_value and value_to_register with
 123      different combinations of register numbers and types.  */
 124   for (const auto &type : types)
 125     {
 126       for (auto regnum = 0; regnum < num_regs; regnum++)
 127         {
 128           if (gdbarch_convert_register_p (gdbarch, regnum, type))
 129             {
 130               std::vector<gdb_byte> expected (TYPE_LENGTH (type), 0);
 131
 132               if (TYPE_CODE (type) == TYPE_CODE_FLT)
 133                 {
 134                   /* Generate valid float format.  */
 135                   target_float_from_string (expected.data (), type, "1.25");
 136                 }
 137               else
 138                 {
 139                   for (auto j = 0; j < expected.size (); j++)
 140                     expected[j] = (regnum + j) % 16;
 141                 }
 142
 143               gdbarch_value_to_register (gdbarch, frame, regnum, type,
 144                                          expected.data ());
 145
 146               /* Allocate two bytes more for overflow check.  */
 147               std::vector<gdb_byte> buf (TYPE_LENGTH (type) + 2, 0);
 148               int optim, unavail, ok;
 149
 150               /* Set the fingerprint in the last two bytes.  */
 151               buf [TYPE_LENGTH (type)]= 'w';
 152               buf [TYPE_LENGTH (type) + 1]= 'l';
 153               ok = gdbarch_register_to_value (gdbarch, frame, regnum, type,
 154                                               buf.data (), &optim, &unavail);
 155
 156               SELF_CHECK (ok);
 157               SELF_CHECK (!optim);
 158               SELF_CHECK (!unavail);
 159
 160               SELF_CHECK (buf[TYPE_LENGTH (type)] == 'w');
 161               SELF_CHECK (buf[TYPE_LENGTH (type) + 1] == 'l');
 162
 163               for (auto k = 0; k < TYPE_LENGTH(type); k++)
 164                 SELF_CHECK (buf[k] == expected[k]);
 165             }
 166         }
 167     }
 168 }
 169
 170 } // namespace selftests
 171 #endif /* GDB_SELF_TEST */
 172
 173 void
 174 _initialize_gdbarch_selftests (void)
 175 {
 176 #if GDB_SELF_TEST
 177   selftests::register_test_foreach_arch ("register_to_value",
 178                                          selftests::register_to_value_test);
 179 #endif
 180 }