1 #include <stdio.h> 2 /* 3 * Since using watchpoints can be very slow, we have to take some pains to 4 * ensure that we don't run too long with them enabled or we run the risk 5 * of having the test timeout. To help avoid this, we insert some marker 6 * functions in the execution stream so we can set breakpoints at known 7 * locations, without worrying about invalidating line numbers by changing 8 * this file. We use null bodied functions are markers since gdb does 9 * not support breakpoints at labeled text points at this time. 10 * 11 * One place we need is a marker for when we start executing our tests 12 * instructions rather than any process startup code, so we insert one 13 * right after entering main(). Another is right before we finish, before 14 * we start executing any process termination code. 15 * 16 * Another problem we have to guard against, at least for the test 17 * suite, is that we need to ensure that the line that causes the 18 * watchpoint to be hit is still the current line when gdb notices 19 * the hit. Depending upon the specific code generated by the compiler, 20 * the instruction after the one that triggers the hit may be part of 21 * the same line or part of the next line. Thus we ensure that there 22 * are always some instructions to execute on the same line after the 23 * code that should trigger the hit. 24 */ 25 26 int count = -1; 27 int ival1 = -1; 28 int ival2 = -1; 29 int ival3 = -1; 30 int ival4 = -1; 31 char buf[10]; 32 struct foo 33 { 34 int val; 35 }; 36 struct foo struct1, struct2, *ptr1, *ptr2; 37 38 int doread = 0; 39 40 void marker1 () 41 { 42 } 43 44 void marker2 () 45 { 46 } 47 48 void marker4 () 49 { 50 } 51 52 void marker5 () 53 { 54 } 55 56 void 57 func2 () 58 { 59 } 60 61 int 62 func1 () 63 { 64 /* The point of this is that we will set a breakpoint at this call. 65 66 Then, if DECR_PC_AFTER_BREAK equals the size of a function call 67 instruction (true on a sun3 if this is gcc-compiled--FIXME we 68 should use asm() to make it work for any compiler, present or 69 future), then we will end up branching to the location just after 70 the breakpoint. And we better not confuse that with hitting the 71 breakpoint. */ 72 func2 (); 73 return 73; 74 } 75 76 int main () 77 { 78 struct1.val = 1; 79 struct2.val = 2; 80 ptr1 = &struct1; 81 ptr2 = &struct2; 82 marker1 (); 83 func1 (); 84 for (count = 0; count < 4; count++) { 85 ival1 = count; 86 ival3 = count; ival4 = count; 87 } 88 ival1 = count; /* Outside loop */ 89 ival2 = count; 90 ival3 = count; ival4 = count; 91 marker2 (); 92 if (doread) 93 { 94 static char msg[] = "type stuff for buf now:"; 95 write (1, msg, sizeof (msg) - 1); 96 read (0, &buf[0], 5); 97 } 98 marker4 (); 99 100 /* We have a watchpoint on ptr1->val. It should be triggered if 101 ptr1's value changes. */ 102 ptr1 = ptr2; 103 104 /* This should not trigger the watchpoint. If it does, then we 105 used the wrong value chain to re-insert the watchpoints or we 106 are not evaluating the watchpoint expression correctly. */ 107 struct1.val = 5; 108 marker5 (); 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 } 121