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examine-backward.c revision 1.1.1.5 
      1 /* This testcase is part of GDB, the GNU debugger.
      2 
      3    Copyright 2015-2023 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 /* This is here just to ensure we have a null character before
     36    TestStrings, to avoid showing garbage when we look for strings
     37    backwards from TestStrings.  */
     38 
     39 const unsigned char Barrier[] = {
     40   0x00,
     41 };
     42 
     43 const unsigned char TestStrings[] = {
     44   0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
     45   0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50,
     46   0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
     47   0x59, 0x5a, 0x00, 0x00, 0x00, 0xe3, 0x81, 0xbb,
     48   0xe3, 0x81, 0x92, 0xe3, 0x81, 0xbb, 0xe3, 0x81,
     49   0x92, 0x00, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
     50   0x36, 0x37, 0x38, 0x39, 0x30, 0x31, 0x32, 0x33,
     51   0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x30, 0x31,
     52   0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
     53   0x00, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x00,
     54   0x00
     55 };
     56 
     57 const short TestStringsH[] = {
     58   0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047, 0x0048,
     59   0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f, 0x0050,
     60   0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057, 0x0058,
     61   0x0059, 0x005a, 0x0000, 0x0000, 0x0000, 0x307b, 0x3052, 0x307b,
     62   0x3052, 0x0000, 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035,
     63   0x0036, 0x0037, 0x0038, 0x0039, 0x0030, 0x0031, 0x0032, 0x0033,
     64   0x0034, 0x0035, 0x0036, 0x0037, 0x0038, 0x0039, 0x0030, 0x0031,
     65   0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037, 0x0038, 0x0039,
     66   0x0000, 0x0021, 0x0021, 0x0021, 0x0021, 0x0021, 0x0021, 0x0000,
     67   0x0000
     68 };
     69 
     70 const int TestStringsW[] = {
     71   0x00000041, 0x00000042, 0x00000043, 0x00000044,
     72   0x00000045, 0x00000046, 0x00000047, 0x00000048,
     73   0x00000049, 0x0000004a, 0x0000004b, 0x0000004c,
     74   0x0000004d, 0x0000004e, 0x0000004f, 0x00000050,
     75   0x00000051, 0x00000052, 0x00000053, 0x00000054,
     76   0x00000055, 0x00000056, 0x00000057, 0x00000058,
     77   0x00000059, 0x0000005a, 0x00000000, 0x00000000,
     78   0x00000000, 0x0000307b, 0x00003052, 0x0000307b,
     79   0x00003052, 0x00000000, 0x00000030, 0x00000031,
     80   0x00000032, 0x00000033, 0x00000034, 0x00000035,
     81   0x00000036, 0x00000037, 0x00000038, 0x00000039,
     82   0x00000030, 0x00000031, 0x00000032, 0x00000033,
     83   0x00000034, 0x00000035, 0x00000036, 0x00000037,
     84   0x00000038, 0x00000039, 0x00000030, 0x00000031,
     85   0x00000032, 0x00000033, 0x00000034, 0x00000035,
     86   0x00000036, 0x00000037, 0x00000038, 0x00000039,
     87   0x00000000, 0x00000021, 0x00000021, 0x00000021,
     88   0x00000021, 0x00000021, 0x00000021, 0x00000000,
     89   0x00000000
     90 };
     91 
     92 int
     93 main (void)
     94 {
     95   /* Clang++ eliminates the variables if nothing references them.  */
     96   int dummy = Barrier[0] + TestStrings[0] + TestStringsH[0] + TestStringsW[0];
     97 
     98   /* Backward disassemble test requires at least 20 instructions in
     99      this function.  Adding a simple bubble sort.  */
    100   int i, j;
    101   int n[] = {3, 1, 4, 1, 5, 9};
    102   int len = sizeof (n) / sizeof (n[0]);
    103 
    104   for (i = 0; i < len - 1; ++i)
    105     {
    106       for (j = i; j < len; ++j)
    107         {
    108           if (n[j] < n[i])
    109             {
    110               int tmp = n[i];
    111               n[i] = n[j];
    112               n[j] = tmp;
    113             }
    114         }
    115     }
    116   return 42;
    117 }
    118