gdb/testsuite/gdb.base/examine-backward.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2015-2024 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 /*
  19 Define TestStrings, TestStringsH, and TestStringsW to test utf8, utf16,
  20 and utf32 strings respectively.
  21 To avoid compile errors due to old compiler mode, we don't use string
  22 literals.  The content of each array is the same as followings:
  23
  24   const char TestStrings[] = {
  25       "ABCD"
  26       "EFGHIJKLMNOPQRSTUVWXYZ\0"
  27       "\0"
  28       "\0"
  29       "\u307B\u3052\u307B\u3052\0"
  30       "012345678901234567890123456789\0"
  31       "!!!!!!\0"
  32   };
  33 */
  34
  35 unsigned char TestStringsBase[] = {
  36   /* This is here just to ensure we have a null character before
  37      TestStrings, to avoid showing garbage when we look for strings
  38      backwards from TestStrings.  */
  39   0x0,
  40
  41   0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
  42   0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50,
  43   0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
  44   0x59, 0x5a, 0x00, 0x00, 0x00, 0xe3, 0x81, 0xbb,
  45   0xe3, 0x81, 0x92, 0xe3, 0x81, 0xbb, 0xe3, 0x81,
  46   0x92, 0x00, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
  47   0x36, 0x37, 0x38, 0x39, 0x30, 0x31, 0x32, 0x33,
  48   0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x30, 0x31,
  49   0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
  50   0x00, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x00,
  51   0x00
  52 };
  53
  54 unsigned char *TestStrings = &TestStringsBase[1];
  55
  56 short TestStringsHBase[] = {
  57   /* This is here just to ensure we have a null character before
  58      TestStringsH, to avoid showing garbage when we look for strings
  59      backwards from TestStringsH.  */
  60   0x0,
  61
  62   0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047, 0x0048,
  63   0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f, 0x0050,
  64   0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057, 0x0058,
  65   0x0059, 0x005a, 0x0000, 0x0000, 0x0000, 0x307b, 0x3052, 0x307b,
  66   0x3052, 0x0000, 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035,
  67   0x0036, 0x0037, 0x0038, 0x0039, 0x0030, 0x0031, 0x0032, 0x0033,
  68   0x0034, 0x0035, 0x0036, 0x0037, 0x0038, 0x0039, 0x0030, 0x0031,
  69   0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037, 0x0038, 0x0039,
  70   0x0000, 0x0021, 0x0021, 0x0021, 0x0021, 0x0021, 0x0021, 0x0000,
  71   0x0000
  72 };
  73
  74 short *TestStringsH = &TestStringsHBase[1];
  75
  76 int TestStringsWBase[] = {
  77   /* This is here just to ensure we have a null character before
  78      TestStringsW, to avoid showing garbage when we look for strings
  79      backwards from TestStringsW.  */
  80   0x0,
  81
  82   0x00000041, 0x00000042, 0x00000043, 0x00000044,
  83   0x00000045, 0x00000046, 0x00000047, 0x00000048,
  84   0x00000049, 0x0000004a, 0x0000004b, 0x0000004c,
  85   0x0000004d, 0x0000004e, 0x0000004f, 0x00000050,
  86   0x00000051, 0x00000052, 0x00000053, 0x00000054,
  87   0x00000055, 0x00000056, 0x00000057, 0x00000058,
  88   0x00000059, 0x0000005a, 0x00000000, 0x00000000,
  89   0x00000000, 0x0000307b, 0x00003052, 0x0000307b,
  90   0x00003052, 0x00000000, 0x00000030, 0x00000031,
  91   0x00000032, 0x00000033, 0x00000034, 0x00000035,
  92   0x00000036, 0x00000037, 0x00000038, 0x00000039,
  93   0x00000030, 0x00000031, 0x00000032, 0x00000033,
  94   0x00000034, 0x00000035, 0x00000036, 0x00000037,
  95   0x00000038, 0x00000039, 0x00000030, 0x00000031,
  96   0x00000032, 0x00000033, 0x00000034, 0x00000035,
  97   0x00000036, 0x00000037, 0x00000038, 0x00000039,
  98   0x00000000, 0x00000021, 0x00000021, 0x00000021,
  99   0x00000021, 0x00000021, 0x00000021, 0x00000000,
 100   0x00000000
 101 };
 102
 103 int *TestStringsW = &TestStringsWBase[1];
 104
 105 int
 106 main (void)
 107 {
 108   /* Clang++ eliminates the variables if nothing references them.  */
 109   int dummy = TestStrings[0] + TestStringsH[0] + TestStringsW[0];
 110
 111   /* Backward disassemble test requires at least 20 instructions in
 112      this function.  Adding a simple bubble sort.  */
 113   int i, j;
 114   int n[] = {3, 1, 4, 1, 5, 9};
 115   int len = sizeof (n) / sizeof (n[0]);
 116
 117   for (i = 0; i < len - 1; ++i)
 118     {
 119       for (j = i; j < len; ++j)
 120         {
 121           if (n[j] < n[i])
 122             {
 123               int tmp = n[i];
 124               n[i] = n[j];
 125               n[j] = tmp;
 126             }
 127         }
 128     }
 129   return 42;
 130 }