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111
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1 /* { dg-options "-O -fsanitize=pointer-overflow -fdump-tree-optimized" } */
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2 /* { dg-skip-if "" { *-*-* } "-flto" } */
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3
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4 #define SMAX __PTRDIFF_MAX__
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5
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6 void foo(void)
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7 {
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8 char *p;
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9 char *p2;
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10 char b[1];
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11 char c[1];
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12
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13 p = b + SMAX; /* pointer overflow check is needed */
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14 p = b;
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15 p++;
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16 p2 = p + 1000;
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17 p2 = p + 999;
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18
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19 p = b + SMAX;
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20 p2 = p + 1; /* pointer overflow check is needed */
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21
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22 p = b;
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23 p--; /* pointer overflow check is needed */
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24 p2 = p + 1;
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25 p2 = p + 2;
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26
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27 p = b - SMAX; /* pointer overflow check is needed */
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131
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28 p2 = p + (SMAX - 2); /* b - 2: no need to check this */
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29 p2 = p + (SMAX - 1); /* b - 1: no need to check this */
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30 p2 = p + SMAX; /* b: no need to check this */
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111
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31 p2++; /* b + 1 */
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32
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33 p = c;
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34 p++; /* c + 1 */
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35 p = c - SMAX; /* pointer overflow check is needed */
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36 p2 = p + SMAX; /* c: pointer overflow check is needed */
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37 p2++; /* c + 1 */
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38 }
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39
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40 void bar(char *ptr)
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41 {
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42 char *p = ptr - 1000; /* pointer overflow check is needed */
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43 p = ptr + 1000; /* pointer overflow check is needed */
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44 p -= 2000; /* pointer overflow check is needed */
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45 }
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46
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47 void baz(char *ptr)
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48 {
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49 char **p = &ptr;
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50 char **p2 = p + 20; /* pointer overflow check is needed */
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51 p2--;
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52 }
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53
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54 void positive_and_positive (char *ptr)
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55 {
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56 char **p = &ptr;
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57 char **p2 = p + 100; /* pointer overflow check is needed */
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58 p2 = p + 10;
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59 p += 50;
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60 }
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61
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62 void negative_to_positive (char *ptr)
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63 {
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64 char **p = &ptr;
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65 char **p2 = p + 20; /* pointer overflow check is needed */
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66 p2 = p - 10; /* pointer overflow check is needed */
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67 p2 += 15;
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68 }
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69
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70 void negative_to_negative (char *ptr)
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71 {
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72 char **p = &ptr;
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73 char **p2 = p - 20; /* pointer overflow check is needed */
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74 p2 = p - 20;
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75 p2 += 5;
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76 }
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77
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131
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78 /* { dg-final { scan-tree-dump-times "__ubsan_handle_pointer_overflow" 14 "optimized" } } */
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