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131
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1 /* PR 35503 - Warn about restricted pointers
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2 Test to exercise that -Wrestrict warnings are issued for memory and
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3 sring functions when they are declared in system headers (i.e., not
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4 just when they are explicitly declared in the source file.)
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5 Also verify that the warnings are issued even for calls where the
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6 source of the aliasing violation is in a different function than
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7 the restricted call.
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8 { dg-do compile }
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9 { dg-options "-O2 -Wrestrict" } */
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10
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145
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11 #if __has_include (<stddef.h>)
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12 # include <stddef.h>
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13 #else
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14 /* For cross-compilers. */
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15 typedef __PTRDIFF_TYPE__ ptrdiff_t;
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16 typedef __SIZE_TYPE__ size_t;
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17 #endif
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18
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19 #if __has_include (<string.h>)
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20 # include <string.h>
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21 # undef memcpy
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22 # undef strcat
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23 # undef strcpy
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24 # undef strncat
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25 # undef strncpy
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26 #else
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27 extern void* memcpy (void*, const void*, size_t);
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28 extern char* strcat (char*, const char*);
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29 extern char* strcpy (char*, const char*);
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30 extern char* strncat (char*, const char*, size_t);
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31 extern char* strncpy (char*, const char*, size_t);
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32 #endif
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33
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131
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34
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35 static void wrap_memcpy (void *d, const void *s, size_t n)
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36 {
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37 memcpy (d, s, n); /* { dg-warning "accessing 2 bytes at offsets 0 and 1 overlaps 1 byte at offset 1" "memcpy" } */
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38 }
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39
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40 void call_memcpy (char *d)
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41 {
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42 const void *s = d + 1;
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43 wrap_memcpy (d, s, 2);
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44 }
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45
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46
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47 static void wrap_strcat (char *d, const char *s)
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48 {
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49 strcat (d, s); /* { dg-warning "source argument is the same as destination" "strcat" } */
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50 }
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51
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52 void call_strcat (char *d)
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53 {
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54 const char *s = d;
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55 wrap_strcat (d, s);
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56 }
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57
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58
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59 static void wrap_strcpy (char *d, const char *s)
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60 {
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61 strcpy (d, s); /* { dg-warning "source argument is the same as destination" "strcpy" } */
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62 }
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63
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64 void call_strcpy (char *d)
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65 {
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66 const char *s = d;
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67 wrap_strcpy (d, s);
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68 }
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69
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70
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71 static void wrap_strncat (char *d, const char *s, size_t n)
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72 {
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73 strncat (d, s, n); /* { dg-warning "source argument is the same as destination" "strncat" } */
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74 }
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75
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76 void call_strncat (char *d, size_t n)
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77 {
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78 const char *s = d;
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79 wrap_strncat (d, s, n);
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80 }
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81
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82
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83 static void wrap_strncpy (char *d, const char *s, size_t n)
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84 {
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85 strncpy (d, s, n); /* { dg-warning "source argument is the same as destination" "strncpy" } */
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86 }
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87
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88 void call_strncpy (char *d, size_t n)
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89 {
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90 const char *s = d;
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91 wrap_strncpy (d, s, n);
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92 }
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