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111
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1 /* This tests that when faced with two references to the same memory
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2 location in the same basic block, the second reference should not
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3 be instrumented by the Address Sanitizer. */
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4
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5 /* { dg-options "-fdump-tree-sanopt" } */
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6 /* { dg-do compile } */
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7 /* { dg-skip-if "" { *-*-* } { "*" } { "-O0" } } */
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8
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9 extern char tab[6];
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10
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11 static int
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12 test0 ()
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13 {
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14 /* __builtin___asan_report_store1 called 2 times for the two stores
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15 below. */
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16 tab[0] = 1;
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17 tab[1] = 2;
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18
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19 /* This load should not be instrumented because it is to the same
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20 memory location as above. */
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21 char t0 = tab[1];
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22
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23 /* Likewise. */
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24 char t1 = tab[1];
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25
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26 return t0 + t1;
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27 }
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28
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29 __attribute__((noinline, noclone)) static int
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30 test1 (int i)
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31 {
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32 char foo[4] = {};
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33
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34 /*__builtin___asan_report_store1 called 1 time here to instrument
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35 the initialization. */
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36 foo[i] = 1;
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37
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38 /* Instrument tab memory region. */
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39 __builtin_memset (tab, 3, sizeof (tab));
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40
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41 /* Instrument tab[1] with access size 3. */
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42 __builtin_memcpy (&tab[1], foo + i, 3);
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43
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44 /* This should not generate a __builtin___asan_report_load1 because
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45 the reference to tab[1] has been already instrumented above. */
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46 return tab[1];
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47
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48 /* So for these functions, there should be 3 calls to
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49 __builtin___asan_report_store1. */
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50 }
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51
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52 int
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53 main ()
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54 {
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55 return test0 () && test1 (0);
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56 }
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57
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58 /* { dg-final { scan-tree-dump-times "__builtin___asan_report_store1" 3 "sanopt" } } */
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59 /* { dg-final { scan-tree-dump-not "__builtin___asan_report_load1" "sanopt" } } */
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