1#include <stdio.h> 2#include <unistd.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 27int count = -1; 28int ival1 = -1; 29int ival2 = -1; 30int ival3 = -1; 31int ival4 = -1; 32int ival5 = -1; 33char buf[30] = "testtesttesttesttesttesttestte"; 34struct foo 35{ 36 int val; 37}; 38struct foo struct1, struct2, *ptr1, *ptr2; 39 40int doread = 0; 41 42char *global_ptr; 43char **global_ptr_ptr; 44 45void marker1 () 46{ 47} 48 49void marker2 () 50{ 51} 52 53void marker4 () 54{ 55} 56 57void marker5 () 58{ 59} 60 61void marker6 () 62{ 63} 64 65#ifdef PROTOTYPES 66void recurser (int x) 67#else 68void recurser (x) int x; 69#endif 70{ 71 int local_x; 72 73 if (x > 0) 74 recurser (x-1); 75 local_x = x; 76} 77 78void 79func2 () 80{ 81 int local_a; 82 static int static_b; 83 84 ival5++; 85 local_a = ival5; 86 static_b = local_a; 87} 88 89void 90func3 () 91{ 92 int x; 93 int y; 94 95 x = 0; 96 x = 1; /* second x assignment */ 97 y = 1; 98 y = 2; 99 buf[26] = 3; 100} 101 102int 103func1 () 104{ 105 /* The point of this is that we will set a breakpoint at this call. 106 107 Then, if DECR_PC_AFTER_BREAK equals the size of a function call 108 instruction (true on a sun3 if this is gcc-compiled--FIXME we 109 should use asm() to make it work for any compiler, present or 110 future), then we will end up branching to the location just after 111 the breakpoint. And we better not confuse that with hitting the 112 breakpoint. */ 113 func2 (); 114 return 73; 115} 116 117void 118func4 () 119{ 120 buf[0] = 3; 121 global_ptr = buf; 122 buf[0] = 7; 123 buf[1] = 5; 124 global_ptr_ptr = &global_ptr; 125 buf[0] = 9; 126 global_ptr++; 127} 128 129void 130func5 () 131{ 132 int val = 0, val2 = 23; 133 int *x = &val; 134 135 /* func5 breakpoint here */ 136 x = &val2; 137 val = 27; 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 func5 (); 218 219 return 0; 220} 221