1 // RUN: %clang_cc1 %s -std=c++1z -fsyntax-only -verify -pedantic 2 // RUN: %clang_cc1 %s -std=c++1z -fsyntax-only -verify -pedantic -fno-signed-char 3 // RUN: %clang_cc1 %s -std=c++1z -fsyntax-only -verify -pedantic -fno-wchar -Dwchar_t=__WCHAR_TYPE__ 4 5 # 6 "/usr/include/string.h" 1 3 4 6 extern "C" { 7 typedef decltype(sizeof(int)) size_t; 8 9 extern size_t strlen(const char *p); 10 11 extern int strcmp(const char *s1, const char *s2); 12 extern int strncmp(const char *s1, const char *s2, size_t n); 13 extern int memcmp(const void *s1, const void *s2, size_t n); 14 15 extern char *strchr(const char *s, int c); 16 extern void *memchr(const void *s, int c, size_t n); 17 } 18 # 19 "SemaCXX/constexpr-string.cpp" 2 19 20 # 21 "/usr/include/wchar.h" 1 3 4 21 extern "C" { 22 extern size_t wcslen(const wchar_t *p); 23 24 extern int wcscmp(const wchar_t *s1, const wchar_t *s2); 25 extern int wcsncmp(const wchar_t *s1, const wchar_t *s2, size_t n); 26 extern int wmemcmp(const wchar_t *s1, const wchar_t *s2, size_t n); 27 28 extern wchar_t *wcschr(const wchar_t *s, wchar_t c); 29 extern wchar_t *wmemchr(const wchar_t *s, wchar_t c, size_t n); 30 } 31 32 # 33 "SemaCXX/constexpr-string.cpp" 2 33 namespace Strlen { 34 constexpr int n = __builtin_strlen("hello"); // ok 35 static_assert(n == 5); 36 constexpr int wn = __builtin_wcslen(L"hello"); // ok 37 static_assert(wn == 5); 38 constexpr int m = strlen("hello"); // expected-error {{constant expression}} expected-note {{non-constexpr function 'strlen' cannot be used in a constant expression}} 39 constexpr int wm = wcslen(L"hello"); // expected-error {{constant expression}} expected-note {{non-constexpr function 'wcslen' cannot be used in a constant expression}} 40 41 // Make sure we can evaluate a call to strlen. 42 int arr[3]; // expected-note 2{{here}} 43 int k = arr[strlen("hello")]; // expected-warning {{array index 5}} 44 int wk = arr[wcslen(L"hello")]; // expected-warning {{array index 5}} 45 } 46 47 namespace StrcmpEtc { 48 constexpr char kFoobar[6] = {'f','o','o','b','a','r'}; 49 constexpr char kFoobazfoobar[12] = {'f','o','o','b','a','z','f','o','o','b','a','r'}; 50 51 static_assert(__builtin_strcmp("abab", "abab") == 0); 52 static_assert(__builtin_strcmp("abab", "abba") == -1); 53 static_assert(__builtin_strcmp("abab", "abaa") == 1); 54 static_assert(__builtin_strcmp("ababa", "abab") == 1); 55 static_assert(__builtin_strcmp("abab", "ababa") == -1); 56 static_assert(__builtin_strcmp("abab\0banana", "abab") == 0); 57 static_assert(__builtin_strcmp("abab", "abab\0banana") == 0); 58 static_assert(__builtin_strcmp("abab\0banana", "abab\0canada") == 0); 59 static_assert(__builtin_strcmp(0, "abab") == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced null}} 60 static_assert(__builtin_strcmp("abab", 0) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced null}} 61 62 static_assert(__builtin_strcmp(kFoobar, kFoobazfoobar) == -1); // FIXME: Should we reject this? 63 static_assert(__builtin_strcmp(kFoobar, kFoobazfoobar + 6) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} 64 65 static_assert(__builtin_strncmp("abaa", "abba", 5) == -1); 66 static_assert(__builtin_strncmp("abaa", "abba", 4) == -1); 67 static_assert(__builtin_strncmp("abaa", "abba", 3) == -1); 68 static_assert(__builtin_strncmp("abaa", "abba", 2) == 0); 69 static_assert(__builtin_strncmp("abaa", "abba", 1) == 0); 70 static_assert(__builtin_strncmp("abaa", "abba", 0) == 0); 71 static_assert(__builtin_strncmp(0, 0, 0) == 0); 72 static_assert(__builtin_strncmp("abab\0banana", "abab\0canada", 100) == 0); 73 74 static_assert(__builtin_strncmp(kFoobar, kFoobazfoobar, 6) == -1); 75 static_assert(__builtin_strncmp(kFoobar, kFoobazfoobar, 7) == -1); // FIXME: Should we reject this? 76 static_assert(__builtin_strncmp(kFoobar, kFoobazfoobar + 6, 6) == 0); 77 static_assert(__builtin_strncmp(kFoobar, kFoobazfoobar + 6, 7) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} 78 79 static_assert(__builtin_memcmp("abaa", "abba", 3) == -1); 80 static_assert(__builtin_memcmp("abaa", "abba", 2) == 0); 81 static_assert(__builtin_memcmp(0, 0, 0) == 0); 82 static_assert(__builtin_memcmp("abab\0banana", "abab\0banana", 100) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} 83 static_assert(__builtin_memcmp("abab\0banana", "abab\0canada", 100) == -1); // FIXME: Should we reject this? 84 static_assert(__builtin_memcmp("abab\0banana", "abab\0canada", 7) == -1); 85 static_assert(__builtin_memcmp("abab\0banana", "abab\0canada", 6) == -1); 86 static_assert(__builtin_memcmp("abab\0banana", "abab\0canada", 5) == 0); 87 88 constexpr int a = strcmp("hello", "world"); // expected-error {{constant expression}} expected-note {{non-constexpr function 'strcmp' cannot be used in a constant expression}} 89 constexpr int b = strncmp("hello", "world", 3); // expected-error {{constant expression}} expected-note {{non-constexpr function 'strncmp' cannot be used in a constant expression}} 90 constexpr int c = memcmp("hello", "world", 3); // expected-error {{constant expression}} expected-note {{non-constexpr function 'memcmp' cannot be used in a constant expression}} 91 } 92 93 namespace WcscmpEtc { 94 constexpr wchar_t kFoobar[6] = {L'f',L'o',L'o',L'b',L'a',L'r'}; 95 constexpr wchar_t kFoobazfoobar[12] = {L'f',L'o',L'o',L'b',L'a',L'z',L'f',L'o',L'o',L'b',L'a',L'r'}; 96 97 static_assert(__builtin_wcscmp(L"abab", L"abab") == 0); 98 static_assert(__builtin_wcscmp(L"abab", L"abba") == -1); 99 static_assert(__builtin_wcscmp(L"abab", L"abaa") == 1); 100 static_assert(__builtin_wcscmp(L"ababa", L"abab") == 1); 101 static_assert(__builtin_wcscmp(L"abab", L"ababa") == -1); 102 static_assert(__builtin_wcscmp(L"abab\0banana", L"abab") == 0); 103 static_assert(__builtin_wcscmp(L"abab", L"abab\0banana") == 0); 104 static_assert(__builtin_wcscmp(L"abab\0banana", L"abab\0canada") == 0); 105 static_assert(__builtin_wcscmp(0, L"abab") == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced null}} 106 static_assert(__builtin_wcscmp(L"abab", 0) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced null}} 107 108 static_assert(__builtin_wcscmp(kFoobar, kFoobazfoobar) == -1); // FIXME: Should we reject this? 109 static_assert(__builtin_wcscmp(kFoobar, kFoobazfoobar + 6) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} 110 111 static_assert(__builtin_wcsncmp(L"abaa", L"abba", 5) == -1); 112 static_assert(__builtin_wcsncmp(L"abaa", L"abba", 4) == -1); 113 static_assert(__builtin_wcsncmp(L"abaa", L"abba", 3) == -1); 114 static_assert(__builtin_wcsncmp(L"abaa", L"abba", 2) == 0); 115 static_assert(__builtin_wcsncmp(L"abaa", L"abba", 1) == 0); 116 static_assert(__builtin_wcsncmp(L"abaa", L"abba", 0) == 0); 117 static_assert(__builtin_wcsncmp(0, 0, 0) == 0); 118 static_assert(__builtin_wcsncmp(L"abab\0banana", L"abab\0canada", 100) == 0); 119 120 static_assert(__builtin_wcsncmp(kFoobar, kFoobazfoobar, 6) == -1); 121 static_assert(__builtin_wcsncmp(kFoobar, kFoobazfoobar, 7) == -1); // FIXME: Should we reject this? 122 static_assert(__builtin_wcsncmp(kFoobar, kFoobazfoobar + 6, 6) == 0); 123 static_assert(__builtin_wcsncmp(kFoobar, kFoobazfoobar + 6, 7) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} 124 125 static_assert(__builtin_wmemcmp(L"abaa", L"abba", 3) == -1); 126 static_assert(__builtin_wmemcmp(L"abaa", L"abba", 2) == 0); 127 static_assert(__builtin_wmemcmp(0, 0, 0) == 0); 128 static_assert(__builtin_wmemcmp(L"abab\0banana", L"abab\0banana", 100) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} 129 static_assert(__builtin_wmemcmp(L"abab\0banana", L"abab\0canada", 100) == -1); // FIXME: Should we reject this? 130 static_assert(__builtin_wmemcmp(L"abab\0banana", L"abab\0canada", 7) == -1); 131 static_assert(__builtin_wmemcmp(L"abab\0banana", L"abab\0canada", 6) == -1); 132 static_assert(__builtin_wmemcmp(L"abab\0banana", L"abab\0canada", 5) == 0); 133 134 constexpr int a = wcscmp(L"hello", L"world"); // expected-error {{constant expression}} expected-note {{non-constexpr function 'wcscmp' cannot be used in a constant expression}} 135 constexpr int b = wcsncmp(L"hello", L"world", 3); // expected-error {{constant expression}} expected-note {{non-constexpr function 'wcsncmp' cannot be used in a constant expression}} 136 constexpr int c = wmemcmp(L"hello", L"world", 3); // expected-error {{constant expression}} expected-note {{non-constexpr function 'wmemcmp' cannot be used in a constant expression}} 137 } 138 139 namespace StrchrEtc { 140 constexpr const char *kStr = "abca\xff\0d"; 141 constexpr char kFoo[] = {'f', 'o', 'o'}; 142 static_assert(__builtin_strchr(kStr, 'a') == kStr); 143 static_assert(__builtin_strchr(kStr, 'b') == kStr + 1); 144 static_assert(__builtin_strchr(kStr, 'c') == kStr + 2); 145 static_assert(__builtin_strchr(kStr, 'd') == nullptr); 146 static_assert(__builtin_strchr(kStr, 'e') == nullptr); 147 static_assert(__builtin_strchr(kStr, '\0') == kStr + 5); 148 static_assert(__builtin_strchr(kStr, 'a' + 256) == nullptr); 149 static_assert(__builtin_strchr(kStr, 'a' - 256) == nullptr); 150 static_assert(__builtin_strchr(kStr, '\xff') == kStr + 4); 151 static_assert(__builtin_strchr(kStr, '\xff' + 256) == nullptr); 152 static_assert(__builtin_strchr(kStr, '\xff' - 256) == nullptr); 153 static_assert(__builtin_strchr(kFoo, 'o') == kFoo + 1); 154 static_assert(__builtin_strchr(kFoo, 'x') == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} 155 static_assert(__builtin_strchr(nullptr, 'x') == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced null}} 156 157 static_assert(__builtin_memchr(kStr, 'a', 0) == nullptr); 158 static_assert(__builtin_memchr(kStr, 'a', 1) == kStr); 159 static_assert(__builtin_memchr(kStr, '\0', 5) == nullptr); 160 static_assert(__builtin_memchr(kStr, '\0', 6) == kStr + 5); 161 static_assert(__builtin_memchr(kStr, '\xff', 8) == kStr + 4); 162 static_assert(__builtin_memchr(kStr, '\xff' + 256, 8) == kStr + 4); 163 static_assert(__builtin_memchr(kStr, '\xff' - 256, 8) == kStr + 4); 164 static_assert(__builtin_memchr(kFoo, 'x', 3) == nullptr); 165 static_assert(__builtin_memchr(kFoo, 'x', 4) == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} 166 static_assert(__builtin_memchr(nullptr, 'x', 3) == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced null}} 167 static_assert(__builtin_memchr(nullptr, 'x', 0) == nullptr); // FIXME: Should we reject this? 168 169 static_assert(__builtin_char_memchr(kStr, 'a', 0) == nullptr); 170 static_assert(__builtin_char_memchr(kStr, 'a', 1) == kStr); 171 static_assert(__builtin_char_memchr(kStr, '\0', 5) == nullptr); 172 static_assert(__builtin_char_memchr(kStr, '\0', 6) == kStr + 5); 173 static_assert(__builtin_char_memchr(kStr, '\xff', 8) == kStr + 4); 174 static_assert(__builtin_char_memchr(kStr, '\xff' + 256, 8) == kStr + 4); 175 static_assert(__builtin_char_memchr(kStr, '\xff' - 256, 8) == kStr + 4); 176 static_assert(__builtin_char_memchr(kFoo, 'x', 3) == nullptr); 177 static_assert(__builtin_char_memchr(kFoo, 'x', 4) == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} 178 static_assert(__builtin_char_memchr(nullptr, 'x', 3) == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced null}} 179 static_assert(__builtin_char_memchr(nullptr, 'x', 0) == nullptr); // FIXME: Should we reject this? 180 181 static_assert(*__builtin_char_memchr(kStr, '\xff', 8) == '\xff'); 182 constexpr bool char_memchr_mutable() { 183 char buffer[] = "mutable"; 184 *__builtin_char_memchr(buffer, 't', 8) = 'r'; 185 *__builtin_char_memchr(buffer, 'm', 8) = 'd'; 186 return __builtin_strcmp(buffer, "durable") == 0; 187 } 188 static_assert(char_memchr_mutable()); 189 190 constexpr bool a = !strchr("hello", 'h'); // expected-error {{constant expression}} expected-note {{non-constexpr function 'strchr' cannot be used in a constant expression}} 191 constexpr bool b = !memchr("hello", 'h', 3); // expected-error {{constant expression}} expected-note {{non-constexpr function 'memchr' cannot be used in a constant expression}} 192 } 193 194 namespace WcschrEtc { 195 constexpr const wchar_t *kStr = L"abca\xffff\0dL"; 196 constexpr wchar_t kFoo[] = {L'f', L'o', L'o'}; 197 static_assert(__builtin_wcschr(kStr, L'a') == kStr); 198 static_assert(__builtin_wcschr(kStr, L'b') == kStr + 1); 199 static_assert(__builtin_wcschr(kStr, L'c') == kStr + 2); 200 static_assert(__builtin_wcschr(kStr, L'd') == nullptr); 201 static_assert(__builtin_wcschr(kStr, L'e') == nullptr); 202 static_assert(__builtin_wcschr(kStr, L'\0') == kStr + 5); 203 static_assert(__builtin_wcschr(kStr, L'a' + 256) == nullptr); 204 static_assert(__builtin_wcschr(kStr, L'a' - 256) == nullptr); 205 static_assert(__builtin_wcschr(kStr, L'\xffff') == kStr + 4); 206 static_assert(__builtin_wcschr(kFoo, L'o') == kFoo + 1); 207 static_assert(__builtin_wcschr(kFoo, L'x') == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} 208 static_assert(__builtin_wcschr(nullptr, L'x') == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced null}} 209 210 static_assert(__builtin_wmemchr(kStr, L'a', 0) == nullptr); 211 static_assert(__builtin_wmemchr(kStr, L'a', 1) == kStr); 212 static_assert(__builtin_wmemchr(kStr, L'\0', 5) == nullptr); 213 static_assert(__builtin_wmemchr(kStr, L'\0', 6) == kStr + 5); 214 static_assert(__builtin_wmemchr(kStr, L'\xffff', 8) == kStr + 4); 215 static_assert(__builtin_wmemchr(kFoo, L'x', 3) == nullptr); 216 static_assert(__builtin_wmemchr(kFoo, L'x', 4) == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} 217 static_assert(__builtin_wmemchr(nullptr, L'x', 3) == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced null}} 218 static_assert(__builtin_wmemchr(nullptr, L'x', 0) == nullptr); // FIXME: Should we reject this? 219 220 constexpr bool a = !wcschr(L"hello", L'h'); // expected-error {{constant expression}} expected-note {{non-constexpr function 'wcschr' cannot be used in a constant expression}} 221 constexpr bool b = !wmemchr(L"hello", L'h', 3); // expected-error {{constant expression}} expected-note {{non-constexpr function 'wmemchr' cannot be used in a constant expression}} 222 } 223