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28d41a99 MS |
1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
7b6bb8da | 3 | Copyright 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
28d41a99 MS |
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 | ||
44 | int count = -1; | |
45 | int ival1 = -1; | |
46 | int ival2 = -1; | |
47 | int ival3 = -1; | |
48 | int ival4 = -1; | |
49 | int ival5 = -1; | |
50 | char buf[10]; | |
51 | struct foo | |
52 | { | |
53 | int val; | |
54 | }; | |
55 | struct foo struct1, struct2, *ptr1, *ptr2; | |
56 | ||
57 | int doread = 0; | |
58 | ||
59 | char *global_ptr; | |
60 | ||
61 | void marker1 () | |
62 | { | |
63 | } | |
64 | ||
65 | void marker2 () | |
66 | { | |
67 | } | |
68 | ||
69 | void marker4 () | |
70 | { | |
71 | } | |
72 | ||
73 | void marker5 () | |
74 | { | |
75 | } | |
76 | ||
77 | void marker6 () | |
78 | { | |
79 | } | |
80 | ||
81 | #ifdef PROTOTYPES | |
82 | void recurser (int x) | |
83 | #else | |
84 | void 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 | ||
94 | void | |
95 | func2 () | |
96 | { | |
97 | int local_a; | |
98 | static int static_b; | |
99 | ||
100 | ival5++; | |
101 | local_a = ival5; | |
102 | static_b = local_a; | |
103 | } | |
104 | ||
105 | void | |
106 | func3 () | |
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 | ||
117 | int | |
118 | func1 () | |
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 | ||
132 | void | |
133 | func4 () | |
134 | { | |
135 | buf[0] = 3; | |
136 | global_ptr = buf; | |
137 | buf[0] = 7; | |
138 | } | |
139 | ||
140 | int 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; | |
33b9c32b MS |
218 | } /* end of main */ |
219 |