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131
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1 /* PR tree-optimization/83776: missing -Warray-bounds indexing past the end
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2 of a string literal
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3 Test to exercise warnings for computations of otherwise in-bounds indices
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4 into strings that temporarily exceed the bounds of the string.
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5 { dg-do compile }
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6 { dg-options "-O2 -Warray-bounds=2 -ftrack-macro-expansion=0" } */
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7
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8 #include "range.h"
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9
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10 #define MAX DIFF_MAX
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11 #define MIN DIFF_MIN
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12
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13 typedef __WCHAR_TYPE__ wchar_t;
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14
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15 void sink (int, ...);
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16
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17 #define T(expr) sink (0, expr)
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18
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19 void test_narrow (void)
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20 {
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21 int i = SR (1, 2);
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22
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23 const char *p0 = "12";
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24 const char *p1 = p0 + i; /* points at '2' or beyond */
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25 const char *p2 = p1 + i; /* points at '\0' or beyond */
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26 const char *p3 = p2 + i; /* points just past the end */
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27 const char *p4 = p3 + i; /* invalid */
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28
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29 T (p0[-1]); /* { dg-warning "array subscript \(-1|\[0-9\]+) is outside array bounds of .char\\\[3]." } */
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30 T (p0[0]);
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31 T (p0[1]);
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32 T (p0[2]);
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33 T (p0[3]); /* { dg-warning "array subscript 3 is outside array bounds of .char\\\[3]." } */
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34
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35 T (&p0[-1]); /* { dg-warning "array subscript \(-1|\[0-9\]+) is \(above|below|outside\) array bounds of .char\\\[3]." } */
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36 T (&p0[0]);
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37 T (&p0[1]);
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38 T (&p0[2]);
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39 T (&p0[3]);
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40 T (&p0[4]); /* { dg-warning "array subscript 4 is \(above|outside\) array bounds of .char\\\[3]." } */
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41
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42 T (p1[-3]); /* { dg-warning "array subscript \\\[-2, -1] is outside array bounds of .char\\\[3]." } */
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43 T (p1[-2]);
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44 T (p1[-1]);
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45 T (p1[ 0]);
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46 T (p1[ 1]);
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47 T (p1[ 2]); /* { dg-warning "array subscript \\\[3, 4] is outside array bounds of .char\\\[3]." } */
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48 T (p1[ 3]); /* { dg-warning "array subscript \\\[4, 5] is outside array bounds of .char\\\[3]." } */
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49
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50 T (&p1[-3]); /* { dg-warning "array subscript \\\[-2, -1] is outside array bounds of .char\\\[3]." "bug" { xfail *-*-* } } */
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51 T (&p1[-2]);
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52 T (&p1[-1]);
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53 T (&p1[ 0]);
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54 T (&p1[ 1]);
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55 T (&p1[ 2]);
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56 T (&p1[ 3]); /* { dg-warning "array subscript \\\[4, 6] is outside array bounds of .char\\\[3]." "bug" { xfail *-*-* } } */
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57
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58 T (p2[-4]); /* { dg-warning "intermediate array offset 4 is outside array bounds of .char\\\[3]." } */
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59 T (p2[-3]);
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60 T (p2[-2]);
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61 T (p2[-1]);
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62 T (p2[ 0]);
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63
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64 /* Even though the lower bound of p3's offsets is in bounds, in order
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65 to subtract 4 from p3 and get a dereferenceable pointer its value
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66 would have to be out-of-bounds. */
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67 T (p3[-4]); /* { dg-warning "intermediate array offset 4 is outside array bounds of .char\\\[3]." } */
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68 T (p3[-3]);
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69 T (p3[-2]);
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70 T (p3[-1]);
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71 T (p3[ 0]); /* { dg-warning "array subscript \\\[3, 6] is outside array bounds of .char\\\[3]." } */
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72
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73 T (p4[-4]); /* { dg-warning "intermediate array offset 4 is outside array bounds of .char\\\[3]." } */
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74 T (p4[-3]); /* { dg-warning "intermediate array offset 4 is outside array bounds of .char\\\[3]." } */
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75 T (p4[-2]); /* { dg-warning "intermediate array offset 4 is outside array bounds of .char\\\[3]." } */
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76
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77 /* The final subscripts below are invalid. */
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78 T (p4[-1]); /* { dg-warning "array subscript \\\[3, 7] is outside array bounds of .char\\\[3]." } */
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79 T (p4[ 0]); /* { dg-warning "array subscript \\\[4, 8] is outside array bounds of .char\\\[3]." } */
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80 }
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81
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82
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83 void test_narrow_vflow (void)
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84 {
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85 int i = SR (DIFF_MAX - 2, DIFF_MAX);
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86 int j = SR (1, DIFF_MAX);
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87
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88 const char *p0 = "123";
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89 const char *p1 = p0 + i; /* points at '2' or beyond */
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90 const char *p2 = p1 + i; /* points at '\0' or beyond */
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91 const char *p3 = p2 + i; /* points just past the end */
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92 const char *p4 = p3 + i; /* invalid */
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93 }
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94
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95
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96 void test_wide (void)
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97 {
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98 int i = SR (1, 2);
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99
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100 const wchar_t *p0 = L"123";
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101 const wchar_t *p1 = p0 + i; /* points at L'2' or beyond */
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102 const wchar_t *p2 = p1 + i; /* points at L'3' or beyond */
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103 const wchar_t *p3 = p2 + i; /* points at L'\0' or beyond */
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104 const wchar_t *p4 = p3 + i; /* points just past the end */
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105 const wchar_t *p5 = p4 + i; /* invalid */
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106
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107 T (p0[0]);
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108 T (p0[1]);
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109 T (p0[2]);
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110 T (p0[3]);
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111 T (p0[4]); /* { dg-warning "array subscript 4 is outside array bounds of .\[a-z \]+\\\[4]." } */
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112
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113 T (p1[-1]);
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114 T (p1[ 0]);
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115 T (p1[ 1]);
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116 T (p1[ 2]);
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117 T (p1[ 3]); /* { dg-warning "array subscript \\\[4, 5] is outside array bounds of .\[a-z \]+\\\[4]." } */
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118
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119 T (&p1[-1]);
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120 T (&p1[ 0]);
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121 T (&p1[ 1]);
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122 T (&p1[ 2]);
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123 T (&p1[ 3]);
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124 T (&p1[ 4]); /* { dg-warning "array subscript \\\[5, 6] is outside array bounds of .\[a-z \]+\\\[4]." "bug" { xfail *-*-* } } */
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125
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126 T (p2[-5]); /* { dg-warning "array subscript \\\[-3, -1] is outside array bounds of .\[a-z \]+\\\[4]." } */
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127 T (p2[-4]);
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128 T (p2[-3]);
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129 T (p2[-2]);
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130 T (p2[-1]);
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131 T (p2[ 0]);
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132
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133 /* Even though the lower bound of p3's offsets is in bounds, in order
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134 to subtract 5 from p3 and get a dereferenceable pointer its value
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135 would have to be out-of-bounds. */
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136 T (p3[-5]); /* { dg-warning "intermediate array offset 5 is outside array bounds of .\[a-z \]+\\\[4]." } */
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137 T (p3[-4]);
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138 T (p3[-3]);
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139 T (p3[-2]);
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140 T (p3[-1]);
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141 T (p3[ 0]);
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142 T (p3[ 1]); /* { dg-warning "array subscript \\\[4, 7] is outside array bounds of .\[a-z \]+\\\[4]." } */
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143
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144 T (p4[-5]); /* { dg-warning "intermediate array offset 5 is outside array bounds of .\[a-z \]+\\\[4]." } */
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145 T (p4[-4]);
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146 T (p4[-3]);
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147 T (p4[-2]);
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148 T (p4[-1]);
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149 T (p4[ 0]); /* { dg-warning "array subscript \\\[4, 8] is outside array bounds of .\[a-z \]+\\\[4]." } */
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150 }
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