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      1 /* This testcase is part of GDB, the GNU debugger.
      2 
      3    Copyright 2013-2025 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 /* Note: 'volatile' is used to make sure the compiler doesn't fold /
     19    optimize out the arithmetic that uses the variables.  */
     20 
     21 static int
     22 func1 (int a, int b)
     23 {
     24   volatile int r = a * b;
     25 
     26   r += (a | b);
     27   r += (a - b);
     28 
     29   return r;
     30 }
     31 
     32 int
     33 main(void)
     34 {
     35   volatile int a = 0;
     36   volatile int b = 1;
     37   volatile int c = 2;
     38   volatile int d = 3;
     39   volatile int e = 4;
     40   volatile double d1 = 1.0;
     41   volatile double d2 = 2.0;
     42 
     43   /* A macro that expands to a single source line that compiles to a
     44      number of instructions, with no branches.  */
     45 #define LINE_WITH_MULTIPLE_INSTRUCTIONS		\
     46   do							\
     47     {							\
     48       a = b + c + d * e - a;				\
     49     } while (0)
     50 
     51   LINE_WITH_MULTIPLE_INSTRUCTIONS; /* location 1 */
     52 
     53   /* A line of source code that compiles to a function call (jump or
     54      branch), surrounded by instructions before and after.  IOW, this
     55      will generate approximately the following pseudo-instructions:
     56 
     57 addr1:
     58      insn1;
     59      insn2;
     60      ...
     61      call func1;
     62      ...
     63      insn3;
     64 addr2:
     65      insn4;
     66 */
     67   e = 10 + func1 (a + b, c * d); /* location 2 */
     68 
     69   e = 10 + func1 (a + b, c * d);
     70 
     71   /* Generate a single source line that includes a short loop.  */
     72 #define LINE_WITH_LOOP						\
     73   do								\
     74     {								\
     75       for (a = 0, e = 0; a < 15; a++)				\
     76 	e += a;							\
     77     } while (0)
     78 
     79   LINE_WITH_LOOP;
     80 
     81   LINE_WITH_LOOP;
     82 
     83   /* Generate a single source line that includes a time-consuming
     84      loop.  GDB breaks the loop early by clearing variable 'c'.  */
     85 #define LINE_WITH_TIME_CONSUMING_LOOP					\
     86   do									\
     87     {									\
     88       for (c = 1, a = 0; a < 65535 && c; a++)				\
     89 	for (b = 0; b < 65535 && c; b++)				\
     90 	  {								\
     91 	    d1 = d2 * a / b;						\
     92 	    d2 = d1 * a;						\
     93 	  }								\
     94     } while (0)
     95 
     96   LINE_WITH_TIME_CONSUMING_LOOP;
     97 
     98   /* Some multi-instruction lines for software watchpoint tests.  */
     99   LINE_WITH_MULTIPLE_INSTRUCTIONS;
    100   LINE_WITH_MULTIPLE_INSTRUCTIONS; /* soft-watch */
    101   LINE_WITH_MULTIPLE_INSTRUCTIONS;
    102 
    103   return 0;
    104 }
    105