gdb/testsuite/gdb.base/range-stepping.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2013-2019 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 /* 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 }