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