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145
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1 /* PR tree-optimization/90879 - fold zero-equality of strcmp between
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2 a longer string and a smaller array
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3 Test for a warning for strcmp of a longer string against smaller
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4 array.
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5 { dg-do compile }
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6 { dg-options "-O2 -Wall -Wstring-compare -Wno-stringop-truncation -ftrack-macro-expansion=0" } */
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7
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8 typedef __SIZE_TYPE__ size_t;
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9
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10 extern void* memcpy (void*, const void*, size_t);
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11
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12 extern int strcmp (const char*, const char*);
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13 extern size_t strlen (const char*);
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14 extern char* strcpy (char*, const char*);
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15 extern char* strncpy (char*, const char*, size_t);
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16 extern int strncmp (const char*, const char*, size_t);
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17
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18 void sink (int, ...);
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19 #define sink(...) sink (__LINE__, __VA_ARGS__)
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20
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21
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22 extern char a1[1], a2[2], a3[3], a4[4], a5[5], a6[6], a7[7], a8[8], a9[9];
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23
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24 #define T(a, b) sink (0 == strcmp (a, b))
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25
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26
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27 void test_string_cst (void)
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28 {
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29 const char *s1 = "1", *s2 = "12";
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30
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31 T (s1, a1); // { dg-warning ".strcmp. of a string of length 1 and an array of size 1 evaluates to nonzero" }
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32 T (s1, a2);
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33 T (s1, a3);
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34
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35 T (a1, s1); // { dg-warning ".strcmp. of a string of length 1 and an array of size 1 evaluates to nonzero" }
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36 T (a2, s1);
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37 T (a3, s1);
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38
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39 T (s2, a1); // { dg-warning ".strcmp. of a string of length 2 and an array of size 1 evaluates to nonzero" }
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40 T (s2, a2); // { dg-warning ".strcmp. of a string of length 2 and an array of size 2 evaluates to nonzero" }
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41 T (s2, a3);
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42
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43 T (a1, s2); // { dg-warning ".strcmp. of a string of length 2 and an array of size 1 evaluates to nonzero" }
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44 T (a2, s2); // { dg-warning ".strcmp. of a string of length 2 and an array of size 2 evaluates to nonzero" }
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45 T (a3, s2);
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46 }
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47
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48
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49 void test_string_cst_off_cst (void)
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50 {
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51 const char *s1 = "1", *s2 = "12", *s3 = "123", *s4 = "1234";
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52
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53 T (s1, a2 + 1); // { dg-warning ".strcmp. of a string of length 1 and an array of size 1 evaluates to nonzero" }
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54 T (a2 + 1, s1); // { dg-warning ".strcmp. of a string of length 1 and an array of size 1 evaluates to nonzero" }
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55
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56
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57 T (s3 + 1, a2); // { dg-warning ".strcmp. of a string of length 2 and an array of size 2 evaluates to nonzero" }
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58 T (s3 + 1, a3);
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59
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60 T (s2, a4 + 1);
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61 T (s2, a4 + 2); // { dg-warning ".strcmp. of a string of length 2 and an array of size 2 evaluates to nonzero" }
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62
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63 T (s4, a4 + 1); // { dg-warning ".strcmp. of a string of length 4 and an array of size 3 evaluates to nonzero" }
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64 T (s3, a5 + 1);
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65 }
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66
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67
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68 /* Use strncpy below rather than memcpy until PR 91183 is resolved. */
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69
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70 #undef T
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71 #define T(s, n, a) \
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72 do { \
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73 char arr[32]; \
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74 sink (arr); \
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75 strncpy (arr, s, n < 0 ? strlen (s) + 1: n); \
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76 sink (0 == strcmp (arr, a)); \
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77 } while (0)
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78
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79 void test_string_exact_length (void)
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80 {
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81 const char *s1 = "1", *s2 = "12";
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82
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83 T (s1, -1, a1); // { dg-warning ".strcmp. of a string of length 1 and an array of size 1 evaluates to nonzero" }
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84 T (s1, -1, a2);
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85 T (s1, -1, a3);
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86
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87 T (s2, -1, a1); // { dg-warning ".strcmp. of a string of length 2 and an array of size 1 evaluates to nonzero" }
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88 T (s2, -1, a2); // { dg-warning ".strcmp. of a string of length 2 and an array of size 2 evaluates to nonzero" }
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89 T (s2, -1, a3);
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90 }
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91
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92
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93 void test_string_min_length (void)
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94 {
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95 const char *s1 = "1", *s2 = "12";
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96
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97 T (s1, 1, a1); // { dg-warning ".strcmp. of a string of length 1 or more and an array of size 1 evaluates to nonzero" }
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98 T (s1, 1, a2);
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99 T (s1, 1, a3);
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100
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101 T (s2, 2, a1); // { dg-warning ".strcmp. of a string of length 2 or more and an array of size 1 evaluates to nonzero" }
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102 T (s2, 2, a2); // { dg-warning ".strcmp. of a string of length 2 or more and an array of size 2 evaluates to nonzero" }
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103 T (s2, 2, a3);
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104 }
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105
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106
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107 int test_strncmp_str_lit_var (const char *s, long n)
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108 {
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109 if (strncmp (s, "123456", n) == 0) // { dg-bogus "\\\[-Wstring-compare" }
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110 return 1;
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111
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112 return 0;
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113 }
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114
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115 int test_strlen_strncmp_str_lit_var (const char *s, long n)
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116 {
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117 if (__builtin_strlen (s) < n)
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118 return -1;
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119
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120 if (n == 6)
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121 if (strncmp (s, "123456", n) == 0) // { dg-bogus "\\\[-Wstring-compare" }
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122 return 1;
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123
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124 return 0;
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125 }
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126
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127
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