1/* This testcase is part of GDB, the GNU debugger.
2
3   Copyright 2008, 2009, 2010, 2011 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#include <stdio.h>
19#include <unistd.h>
20/*
21 *	Since using watchpoints can be very slow, we have to take some pains to
22 *	ensure that we don't run too long with them enabled or we run the risk
23 *	of having the test timeout.  To help avoid this, we insert some marker
24 *	functions in the execution stream so we can set breakpoints at known
25 *	locations, without worrying about invalidating line numbers by changing
26 *	this file.  We use null bodied functions are markers since gdb does
27 *	not support breakpoints at labeled text points at this time.
28 *
29 *	One place we need is a marker for when we start executing our tests
30 *	instructions rather than any process startup code, so we insert one
31 *	right after entering main().  Another is right before we finish, before
32 *	we start executing any process termination code.
33 *
34 *	Another problem we have to guard against, at least for the test
35 *	suite, is that we need to ensure that the line that causes the
36 *	watchpoint to be hit is still the current line when gdb notices
37 *	the hit.  Depending upon the specific code generated by the compiler,
38 *	the instruction after the one that triggers the hit may be part of
39 *	the same line or part of the next line.  Thus we ensure that there
40 *	are always some instructions to execute on the same line after the
41 *	code that should trigger the hit.
42 */
43
44int count = -1;
45int ival1 = -1;
46int ival2 = -1;
47int ival3 = -1;
48int ival4 = -1;
49int ival5 = -1;
50char buf[10];
51struct foo
52{
53  int val;
54};
55struct foo struct1, struct2, *ptr1, *ptr2;
56
57int doread = 0;
58
59char *global_ptr;
60
61void marker1 ()
62{
63}
64
65void marker2 ()
66{
67}
68
69void marker4 ()
70{
71}
72
73void marker5 ()
74{
75}
76
77void marker6 ()
78{
79}
80
81#ifdef PROTOTYPES
82void recurser (int  x)
83#else
84void recurser (x) int  x;
85#endif
86{
87  int  local_x;
88
89  if (x > 0)
90    recurser (x-1);
91  local_x = x;
92}
93
94void
95func2 ()
96{
97  int  local_a;
98  static int  static_b;
99
100  ival5++;
101  local_a = ival5;
102  static_b = local_a;
103}
104
105void
106func3 ()
107{
108  int x;
109  int y;
110
111  x = 0;
112  x = 1;				/* second x assignment */
113  y = 1;
114  y = 2;
115}
116
117int
118func1 ()
119{
120  /* The point of this is that we will set a breakpoint at this call.
121
122     Then, if DECR_PC_AFTER_BREAK equals the size of a function call
123     instruction (true on a sun3 if this is gcc-compiled--FIXME we
124     should use asm() to make it work for any compiler, present or
125     future), then we will end up branching to the location just after
126     the breakpoint.  And we better not confuse that with hitting the
127     breakpoint.  */
128  func2 ();
129  return 73;
130}
131
132void
133func4 ()
134{
135  buf[0] = 3;
136  global_ptr = buf;
137  buf[0] = 7;
138}
139
140int main ()
141{
142#ifdef usestubs
143  set_debug_traps();
144  breakpoint();
145#endif
146  struct1.val = 1;
147  struct2.val = 2;
148  ptr1 = &struct1;
149  ptr2 = &struct2;
150  marker1 ();
151  func1 ();
152  for (count = 0; count < 4; count++) {
153    ival1 = count;
154    ival3 = count; ival4 = count;
155  }
156  ival1 = count; /* Outside loop */
157  ival2 = count;
158  ival3 = count; ival4 = count;
159  marker2 ();
160  if (doread)
161    {
162      static char msg[] = "type stuff for buf now:";
163      write (1, msg, sizeof (msg) - 1);
164      read (0, &buf[0], 5);
165    }
166  marker4 ();
167
168  /* We have a watchpoint on ptr1->val.  It should be triggered if
169     ptr1's value changes.  */
170  ptr1 = ptr2;
171
172  /* This should not trigger the watchpoint.  If it does, then we
173     used the wrong value chain to re-insert the watchpoints or we
174     are not evaluating the watchpoint expression correctly.  */
175  struct1.val = 5;
176  marker5 ();
177
178  /* We have a watchpoint on ptr1->val.  It should be triggered if
179     ptr1's value changes.  */
180  ptr1 = ptr2;
181
182  /* This should not trigger the watchpoint.  If it does, then we
183     used the wrong value chain to re-insert the watchpoints or we
184     are not evaluating the watchpoint expression correctly.  */
185  struct1.val = 5;
186  marker5 ();
187
188  /* We're going to watch locals of func2, to see that out-of-scope
189     watchpoints are detected and properly deleted.
190     */
191  marker6 ();
192
193  /* This invocation is used for watches of a single
194     local variable. */
195  func2 ();
196
197  /* This invocation is used for watches of an expression
198     involving a local variable. */
199  func2 ();
200
201  /* This invocation is used for watches of a static
202     (non-stack-based) local variable. */
203  func2 ();
204
205  /* This invocation is used for watches of a local variable
206     when recursion happens.
207     */
208  marker6 ();
209  recurser (2);
210
211  marker6 ();
212
213  func3 ();
214
215  func4 ();
216
217  return 0;
218} /* end of main */
219
220