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ef44eed1 SS |
1 | #include <stdio.h> |
2 | #include <stdio.h> | |
3 | /* | |
4 | * Since using watchpoints can be very slow, we have to take some pains to | |
5 | * ensure that we don't run too long with them enabled or we run the risk | |
6 | * of having the test timeout. To help avoid this, we insert some marker | |
7 | * functions in the execution stream so we can set breakpoints at known | |
8 | * locations, without worrying about invalidating line numbers by changing | |
9 | * this file. We use null bodied functions are markers since gdb does | |
10 | * not support breakpoints at labeled text points at this time. | |
11 | * | |
12 | * One place we need is a marker for when we start executing our tests | |
13 | * instructions rather than any process startup code, so we insert one | |
14 | * right after entering main(). Another is right before we finish, before | |
15 | * we start executing any process termination code. | |
16 | * | |
17 | * Another problem we have to guard against, at least for the test | |
18 | * suite, is that we need to ensure that the line that causes the | |
19 | * watchpoint to be hit is still the current line when gdb notices | |
20 | * the hit. Depending upon the specific code generated by the compiler, | |
21 | * the instruction after the one that triggers the hit may be part of | |
22 | * the same line or part of the next line. Thus we ensure that there | |
23 | * are always some instructions to execute on the same line after the | |
24 | * code that should trigger the hit. | |
25 | */ | |
26 | ||
27 | int count = -1; | |
28 | int ival1 = -1; | |
29 | int ival2 = -1; | |
30 | int ival3 = -1; | |
31 | int ival4 = -1; | |
32 | char buf[10]; | |
33 | struct foo | |
34 | { | |
35 | int val; | |
36 | }; | |
37 | struct foo struct1, struct2, *ptr1, *ptr2; | |
38 | ||
39 | int doread = 0; | |
40 | ||
41 | void marker1 () | |
42 | { | |
43 | } | |
44 | ||
45 | void marker2 () | |
46 | { | |
47 | } | |
48 | ||
49 | void marker4 () | |
50 | { | |
51 | } | |
52 | ||
53 | void marker5 () | |
54 | { | |
55 | } | |
56 | ||
57 | void | |
58 | func2 () | |
59 | { | |
60 | } | |
61 | ||
62 | int | |
63 | func1 () | |
64 | { | |
65 | /* The point of this is that we will set a breakpoint at this call. | |
66 | ||
67 | Then, if DECR_PC_AFTER_BREAK equals the size of a function call | |
68 | instruction (true on a sun3 if this is gcc-compiled--FIXME we | |
69 | should use asm() to make it work for any compiler, present or | |
70 | future), then we will end up branching to the location just after | |
71 | the breakpoint. And we better not confuse that with hitting the | |
72 | breakpoint. */ | |
73 | func2 (); | |
74 | return 73; | |
75 | } | |
76 | ||
77 | int main () | |
78 | { | |
79 | struct1.val = 1; | |
80 | struct2.val = 2; | |
81 | ptr1 = &struct1; | |
82 | ptr2 = &struct2; | |
83 | marker1 (); | |
84 | func1 (); | |
85 | for (count = 0; count < 4; count++) { | |
86 | ival1 = count; | |
87 | ival3 = count; ival4 = count; | |
88 | } | |
89 | ival1 = count; /* Outside loop */ | |
90 | ival2 = count; | |
91 | ival3 = count; ival4 = count; | |
92 | marker2 (); | |
93 | if (doread) | |
94 | read (0, &buf[0], 5); | |
95 | marker4 (); | |
96 | ||
97 | /* We have a watchpoint on ptr1->val. It should be triggered if | |
98 | ptr1's value changes. */ | |
99 | ptr1 = ptr2; | |
100 | ||
101 | /* This should not trigger the watchpoint. If it does, then we | |
102 | used the wrong value chain to re-insert the watchpoints or we | |
103 | are not evaluating the watchpoint expression correctly. */ | |
104 | struct1.val = 5; | |
105 | marker5 (); | |
106 | if (doread) | |
107 | read (0, &buf[0], 5); | |
108 | marker4 (); | |
109 | ||
110 | /* We have a watchpoint on ptr1->val. It should be triggered if | |
111 | ptr1's value changes. */ | |
112 | ptr1 = ptr2; | |
113 | ||
114 | /* This should not trigger the watchpoint. If it does, then we | |
115 | used the wrong value chain to re-insert the watchpoints or we | |
116 | are not evaluating the watchpoint expression correctly. */ | |
117 | struct1.val = 5; | |
118 | marker5 (); | |
119 | return 0; | |
120 | } |