// RUN: %clang_cc1 %s -triple x86_64-linux-gnu -std=c++2a -fsyntax-only -verify -pedantic -Wno-vla-extension // RUN: %clang_cc1 %s -triple x86_64-linux-gnu -std=gnu++2a -fsyntax-only -verify -pedantic -Wno-vla-extension -DGNUMODE // RUN: %clang_cc1 %s -triple x86_64-linux-gnu -std=c++2a -fsyntax-only -verify -pedantic -Wno-vla-extension -fno-signed-char // RUN: %clang_cc1 %s -triple x86_64-linux-gnu -std=c++2a -fsyntax-only -verify -pedantic -Wno-vla-extension -fno-wchar -DNO_PREDEFINED_WCHAR_T // RUN: %clang_cc1 %s -triple armebv7-unknown-linux -std=c++2a -fsyntax-only -verify -pedantic -Wno-vla-extension // RUN: %clang_cc1 %s -triple armebv7-unknown-linux -std=gnu++2a -fsyntax-only -verify -pedantic -Wno-vla-extension -DGNUMODE // RUN: %clang_cc1 %s -triple armebv7-unknown-linux -std=c++2a -fsyntax-only -verify -pedantic -Wno-vla-extension -fno-signed-char // RUN: %clang_cc1 %s -triple armebv7-unknown-linux -std=c++2a -fsyntax-only -verify -pedantic -Wno-vla-extension -fno-wchar -DNO_PREDEFINED_WCHAR_T # 9 "/usr/include/string.h" 1 3 4 extern "C" { typedef decltype(sizeof(int)) size_t; extern size_t strlen(const char *p); extern int strcmp(const char *s1, const char *s2); extern int strncmp(const char *s1, const char *s2, size_t n); extern int memcmp(const void *s1, const void *s2, size_t n); #ifdef GNUMODE extern int bcmp(const void *s1, const void *s2, size_t n); #endif extern char *strchr(const char *s, int c); extern void *memchr(const void *s, int c, size_t n); extern void *memcpy(void *d, const void *s, size_t n); extern void *memmove(void *d, const void *s, size_t n); } # 25 "SemaCXX/constexpr-string.cpp" 2 # 27 "/usr/include/wchar.h" 1 3 4 extern "C" { #if NO_PREDEFINED_WCHAR_T typedef decltype(L'0') wchar_t; #endif extern size_t wcslen(const wchar_t *p); extern int wcscmp(const wchar_t *s1, const wchar_t *s2); extern int wcsncmp(const wchar_t *s1, const wchar_t *s2, size_t n); extern int wmemcmp(const wchar_t *s1, const wchar_t *s2, size_t n); extern wchar_t *wcschr(const wchar_t *s, wchar_t c); extern wchar_t *wmemchr(const wchar_t *s, wchar_t c, size_t n); extern wchar_t *wmemcpy(wchar_t *d, const wchar_t *s, size_t n); extern wchar_t *wmemmove(wchar_t *d, const wchar_t *s, size_t n); } # 51 "SemaCXX/constexpr-string.cpp" 2 namespace Strlen { constexpr int n = __builtin_strlen("hello"); // ok static_assert(n == 5); constexpr int wn = __builtin_wcslen(L"hello"); // ok static_assert(wn == 5); constexpr int m = strlen("hello"); // expected-error {{constant expression}} expected-note {{non-constexpr function 'strlen' cannot be used in a constant expression}} constexpr int wm = wcslen(L"hello"); // expected-error {{constant expression}} expected-note {{non-constexpr function 'wcslen' cannot be used in a constant expression}} // Make sure we can evaluate a call to strlen. int arr[3]; // expected-note 2{{here}} int k = arr[strlen("hello")]; // expected-warning {{array index 5}} int wk = arr[wcslen(L"hello")]; // expected-warning {{array index 5}} } namespace StrcmpEtc { constexpr char kFoobar[6] = {'f','o','o','b','a','r'}; constexpr char kFoobazfoobar[12] = {'f','o','o','b','a','z','f','o','o','b','a','r'}; static_assert(__builtin_strcmp("abab", "abab") == 0); static_assert(__builtin_strcmp("abab", "abba") == -1); static_assert(__builtin_strcmp("abab", "abaa") == 1); static_assert(__builtin_strcmp("ababa", "abab") == 1); static_assert(__builtin_strcmp("abab", "ababa") == -1); static_assert(__builtin_strcmp("a\203", "a") == 1); static_assert(__builtin_strcmp("a\203", "a\003") == 1); static_assert(__builtin_strcmp("abab\0banana", "abab") == 0); static_assert(__builtin_strcmp("abab", "abab\0banana") == 0); static_assert(__builtin_strcmp("abab\0banana", "abab\0canada") == 0); static_assert(__builtin_strcmp(0, "abab") == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced null}} static_assert(__builtin_strcmp("abab", 0) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced null}} static_assert(__builtin_strcmp(kFoobar, kFoobazfoobar) == -1); // FIXME: Should we reject this? static_assert(__builtin_strcmp(kFoobar, kFoobazfoobar + 6) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} static_assert(__builtin_strncmp("abaa", "abba", 5) == -1); static_assert(__builtin_strncmp("abaa", "abba", 4) == -1); static_assert(__builtin_strncmp("abaa", "abba", 3) == -1); static_assert(__builtin_strncmp("abaa", "abba", 2) == 0); static_assert(__builtin_strncmp("abaa", "abba", 1) == 0); static_assert(__builtin_strncmp("abaa", "abba", 0) == 0); static_assert(__builtin_strncmp(0, 0, 0) == 0); static_assert(__builtin_strncmp("abab\0banana", "abab\0canada", 100) == 0); static_assert(__builtin_strncmp(kFoobar, kFoobazfoobar, 6) == -1); static_assert(__builtin_strncmp(kFoobar, kFoobazfoobar, 7) == -1); // FIXME: Should we reject this? static_assert(__builtin_strncmp(kFoobar, kFoobazfoobar + 6, 6) == 0); static_assert(__builtin_strncmp(kFoobar, kFoobazfoobar + 6, 7) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} static_assert(__builtin_memcmp("abaa", "abba", 3) == -1); static_assert(__builtin_memcmp("abaa", "abba", 2) == 0); static_assert(__builtin_memcmp("a\203", "a", 2) == 1); static_assert(__builtin_memcmp("a\203", "a\003", 2) == 1); static_assert(__builtin_memcmp(0, 0, 0) == 0); static_assert(__builtin_memcmp("abab\0banana", "abab\0banana", 100) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} static_assert(__builtin_memcmp("abab\0banana", "abab\0canada", 100) == -1); // FIXME: Should we reject this? static_assert(__builtin_memcmp("abab\0banana", "abab\0canada", 7) == -1); static_assert(__builtin_memcmp("abab\0banana", "abab\0canada", 6) == -1); static_assert(__builtin_memcmp("abab\0banana", "abab\0canada", 5) == 0); static_assert(__builtin_memcmp(u8"abaa", u8"abba", 3) == -1); static_assert(__builtin_memcmp(u8"abaa", u8"abba", 2) == 0); static_assert(__builtin_memcmp(u8"a\203", u8"a", 2) == 1); static_assert(__builtin_memcmp(u8"a\203", u8"a\003", 2) == 1); static_assert(__builtin_memcmp(0, 0, 0) == 0); static_assert(__builtin_memcmp(u8"abab\0banana", u8"abab\0banana", 100) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} static_assert(__builtin_memcmp(u8"abab\0banana", u8"abab\0canada", 100) == -1); // FIXME: Should we reject this? static_assert(__builtin_memcmp(u8"abab\0banana", u8"abab\0canada", 7) == -1); static_assert(__builtin_memcmp(u8"abab\0banana", u8"abab\0canada", 6) == -1); static_assert(__builtin_memcmp(u8"abab\0banana", u8"abab\0canada", 5) == 0); static_assert(__builtin_memcmp(u8"\u1234", "\xE1\x88\xB4", 4) == 0); static_assert(__builtin_memcmp(u8"\u1234", "\xE1\x88\xB3", 4) == 1); static_assert(__builtin_bcmp("abaa", "abba", 3) != 0); static_assert(__builtin_bcmp("abaa", "abba", 2) == 0); static_assert(__builtin_bcmp("a\203", "a", 2) != 0); static_assert(__builtin_bcmp("a\203", "a\003", 2) != 0); static_assert(__builtin_bcmp(0, 0, 0) == 0); static_assert(__builtin_bcmp("abab\0banana", "abab\0banana", 100) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} static_assert(__builtin_bcmp("abab\0banana", "abab\0canada", 100) != 0); // FIXME: Should we reject this? static_assert(__builtin_bcmp("abab\0banana", "abab\0canada", 7) != 0); static_assert(__builtin_bcmp("abab\0banana", "abab\0canada", 6) != 0); static_assert(__builtin_bcmp("abab\0banana", "abab\0canada", 5) == 0); extern struct Incomplete incomplete; static_assert(__builtin_memcmp(&incomplete, "", 0u) == 0); static_assert(__builtin_memcmp("", &incomplete, 0u) == 0); static_assert(__builtin_memcmp(&incomplete, "", 1u) == 42); // expected-error {{not an integral constant}} expected-note {{not supported}} static_assert(__builtin_memcmp("", &incomplete, 1u) == 42); // expected-error {{not an integral constant}} expected-note {{not supported}} static_assert(__builtin_bcmp(&incomplete, "", 0u) == 0); static_assert(__builtin_bcmp("", &incomplete, 0u) == 0); static_assert(__builtin_bcmp(&incomplete, "", 1u) == 42); // expected-error {{not an integral constant}} expected-note {{not supported}} static_assert(__builtin_bcmp("", &incomplete, 1u) == 42); // expected-error {{not an integral constant}} expected-note {{not supported}} constexpr unsigned char ku00fe00[] = {0x00, 0xfe, 0x00}; constexpr unsigned char ku00feff[] = {0x00, 0xfe, 0xff}; constexpr signed char ks00fe00[] = {0, -2, 0}; constexpr signed char ks00feff[] = {0, -2, -1}; static_assert(__builtin_memcmp(ku00feff, ks00fe00, 2) == 0); static_assert(__builtin_memcmp(ku00feff, ks00fe00, 99) == 1); static_assert(__builtin_memcmp(ku00fe00, ks00feff, 99) == -1); static_assert(__builtin_memcmp(ks00feff, ku00fe00, 2) == 0); static_assert(__builtin_memcmp(ks00feff, ku00fe00, 99) == 1); static_assert(__builtin_memcmp(ks00fe00, ku00feff, 99) == -1); static_assert(__builtin_memcmp(ks00fe00, ks00feff, 2) == 0); static_assert(__builtin_memcmp(ks00feff, ks00fe00, 99) == 1); static_assert(__builtin_memcmp(ks00fe00, ks00feff, 99) == -1); static_assert(__builtin_bcmp(ku00feff, ks00fe00, 2) == 0); static_assert(__builtin_bcmp(ku00feff, ks00fe00, 99) != 0); static_assert(__builtin_bcmp(ku00fe00, ks00feff, 99) != 0); static_assert(__builtin_bcmp(ks00feff, ku00fe00, 2) == 0); static_assert(__builtin_bcmp(ks00feff, ku00fe00, 99) != 0); static_assert(__builtin_bcmp(ks00fe00, ku00feff, 99) != 0); static_assert(__builtin_bcmp(ks00fe00, ks00feff, 2) == 0); static_assert(__builtin_bcmp(ks00feff, ks00fe00, 99) != 0); static_assert(__builtin_bcmp(ks00fe00, ks00feff, 99) != 0); struct Bool3Tuple { bool bb[3]; }; constexpr Bool3Tuple kb000100 = {{false, true, false}}; static_assert(sizeof(bool) != 1u || __builtin_memcmp(ks00fe00, kb000100.bb, 1) == 0); // expected-error {{constant}} expected-note {{not supported}} static_assert(sizeof(bool) != 1u || __builtin_memcmp(ks00fe00, kb000100.bb, 2) == 1); // expected-error {{constant}} expected-note {{not supported}} static_assert(sizeof(bool) != 1u || __builtin_bcmp(ks00fe00, kb000100.bb, 1) == 0); // expected-error {{constant}} expected-note {{not supported}} static_assert(sizeof(bool) != 1u || __builtin_bcmp(ks00fe00, kb000100.bb, 2) != 0); // expected-error {{constant}} expected-note {{not supported}} constexpr long ksl[] = {0, -1}; constexpr unsigned int kui[] = {0, 0u - 1}; constexpr unsigned long long kull[] = {0, 0ull - 1}; constexpr const auto *kuSizeofLong(void) { if constexpr(sizeof(long) == sizeof(int)) { return kui; } else if constexpr(sizeof(long) == sizeof(long long)) { return kull; } else { return nullptr; } } static_assert(__builtin_memcmp(ksl, kuSizeofLong(), sizeof(long) - 1) == 0); // expected-error {{constant}} expected-note {{not supported}} static_assert(__builtin_memcmp(ksl, kuSizeofLong(), sizeof(long) + 0) == 0); // expected-error {{constant}} expected-note {{not supported}} static_assert(__builtin_memcmp(ksl, kuSizeofLong(), sizeof(long) + 1) == 0); // expected-error {{constant}} expected-note {{not supported}} static_assert(__builtin_memcmp(ksl, kuSizeofLong(), 2*sizeof(long) - 1) == 0); // expected-error {{constant}} expected-note {{not supported}} static_assert(__builtin_memcmp(ksl, kuSizeofLong(), 2*sizeof(long) + 0) == 0); // expected-error {{constant}} expected-note {{not supported}} static_assert(__builtin_memcmp(ksl, kuSizeofLong(), 2*sizeof(long) + 1) == 42); // expected-error {{constant}} expected-note {{not supported}} static_assert(__builtin_memcmp(ksl + 1, kuSizeofLong() + 1, sizeof(long) - 1) == 0); // expected-error {{constant}} expected-note {{not supported}} static_assert(__builtin_memcmp(ksl + 1, kuSizeofLong() + 1, sizeof(long) + 0) == 0); // expected-error {{constant}} expected-note {{not supported}} static_assert(__builtin_memcmp(ksl + 1, kuSizeofLong() + 1, sizeof(long) + 1) == 42); // expected-error {{constant}} expected-note {{not supported}} static_assert(__builtin_bcmp(ksl, kuSizeofLong(), sizeof(long) - 1) == 0); // expected-error {{constant}} expected-note {{not supported}} static_assert(__builtin_bcmp(ksl, kuSizeofLong(), sizeof(long) + 0) == 0); // expected-error {{constant}} expected-note {{not supported}} static_assert(__builtin_bcmp(ksl, kuSizeofLong(), sizeof(long) + 1) == 0); // expected-error {{constant}} expected-note {{not supported}} static_assert(__builtin_bcmp(ksl, kuSizeofLong(), 2*sizeof(long) - 1) == 0); // expected-error {{constant}} expected-note {{not supported}} static_assert(__builtin_bcmp(ksl, kuSizeofLong(), 2*sizeof(long) + 0) == 0); // expected-error {{constant}} expected-note {{not supported}} static_assert(__builtin_bcmp(ksl, kuSizeofLong(), 2*sizeof(long) + 1) == 42); // expected-error {{constant}} expected-note {{not supported}} static_assert(__builtin_bcmp(ksl + 1, kuSizeofLong() + 1, sizeof(long) - 1) == 0); // expected-error {{constant}} expected-note {{not supported}} static_assert(__builtin_bcmp(ksl + 1, kuSizeofLong() + 1, sizeof(long) + 0) == 0); // expected-error {{constant}} expected-note {{not supported}} static_assert(__builtin_bcmp(ksl + 1, kuSizeofLong() + 1, sizeof(long) + 1) == 42); // expected-error {{constant}} expected-note {{not supported}} constexpr int a = strcmp("hello", "world"); // expected-error {{constant expression}} expected-note {{non-constexpr function 'strcmp' cannot be used in a constant expression}} constexpr int b = strncmp("hello", "world", 3); // expected-error {{constant expression}} expected-note {{non-constexpr function 'strncmp' cannot be used in a constant expression}} constexpr int c = memcmp("hello", "world", 3); // expected-error {{constant expression}} expected-note {{non-constexpr function 'memcmp' cannot be used in a constant expression}} #ifdef GNUMODE constexpr int d = bcmp("hello", "world", 3); // expected-error {{constant expression}} expected-note {{non-constexpr function 'bcmp' cannot be used in a constant expression}} #endif } namespace MultibyteElementTests { inline namespace Util { #define STR2(X) #X #define STR(X) STR2(X) constexpr const char ByteOrderString[] = STR(__BYTE_ORDER__); #undef STR #undef STR2 constexpr bool LittleEndian{*ByteOrderString == '1'}; constexpr size_t GoodFoldArraySize = 42, BadFoldArraySize = 43; struct NotBadFoldResult {}; template struct FoldResult; template <> struct FoldResult : NotBadFoldResult {}; template FoldResult *foldResultImpl(T (*ptrToConstantSizeArray)[N]); struct NotFolded : NotBadFoldResult {}; NotFolded *foldResultImpl(bool anyPtr); template struct MetaValue; template auto foldResult(const Callable &, MetaValue *, MetaValue *) { int (*maybeVLAPtr)[Callable{}(N) == ExpectedFoldResult ? GoodFoldArraySize : BadFoldArraySize] = 0; return foldResultImpl(maybeVLAPtr); } template constexpr bool checkFoldResult(const Callable &c, NWrap *n, ExpectedWrap *e) { decltype(static_cast(foldResult(c, n, e))) *chk{}; return true; } template constexpr MetaValue *withN() { return nullptr; } template constexpr MetaValue *withExpected() { return nullptr; } } // namespace Util } // namespace MultibyteElementTests namespace MultibyteElementTests::Memcmp { #ifdef __SIZEOF_INT128__ constexpr __int128 i128_ff_8_00_8 = -(__int128)1 - -1ull; constexpr __int128 i128_00_16 = 0; static_assert(checkFoldResult( [](size_t n) constexpr { return __builtin_memcmp(&i128_ff_8_00_8, &i128_00_16, n); }, withN<1u>(), withExpected())); #endif constexpr const signed char ByteOrderStringReduced[] = { ByteOrderString[0] - '0', ByteOrderString[1] - '0', ByteOrderString[2] - '0', ByteOrderString[3] - '0', }; constexpr signed int i04030201 = 0x04030201; constexpr unsigned int u04030201 = 0x04030201u; static_assert(checkFoldResult( [](size_t n) constexpr { return __builtin_memcmp(ByteOrderStringReduced, &i04030201, n); }, withN(), withExpected<0>())); static_assert(checkFoldResult( [](size_t n) constexpr { return __builtin_memcmp(&u04030201, ByteOrderStringReduced, n); }, withN(), withExpected<0>())); constexpr unsigned int ui0000FEFF = 0x0000feffU; constexpr unsigned short usFEFF = 0xfeffU; static_assert(checkFoldResult( [](size_t n) constexpr { return __builtin_memcmp(&ui0000FEFF, &usFEFF, n); }, withN<1u>(), withExpected())); constexpr unsigned int ui08038700 = 0x08038700u; constexpr unsigned int ui08048600 = 0x08048600u; static_assert(checkFoldResult( [](size_t n) constexpr { return __builtin_memcmp(&ui08038700, &ui08048600, n); }, withN(), withExpected())); } namespace WcscmpEtc { constexpr wchar_t kFoobar[6] = {L'f',L'o',L'o',L'b',L'a',L'r'}; 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'}; static_assert(__builtin_wcscmp(L"abab", L"abab") == 0); static_assert(__builtin_wcscmp(L"abab", L"abba") == -1); static_assert(__builtin_wcscmp(L"abab", L"abaa") == 1); static_assert(__builtin_wcscmp(L"ababa", L"abab") == 1); static_assert(__builtin_wcscmp(L"abab", L"ababa") == -1); static_assert(__builtin_wcscmp(L"abab\0banana", L"abab") == 0); static_assert(__builtin_wcscmp(L"abab", L"abab\0banana") == 0); static_assert(__builtin_wcscmp(L"abab\0banana", L"abab\0canada") == 0); #if __WCHAR_WIDTH__ == 32 static_assert(__builtin_wcscmp(L"a\x83838383", L"a") == (wchar_t)-1U >> 31); #endif static_assert(__builtin_wcscmp(0, L"abab") == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced null}} static_assert(__builtin_wcscmp(L"abab", 0) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced null}} static_assert(__builtin_wcscmp(kFoobar, kFoobazfoobar) == -1); // FIXME: Should we reject this? static_assert(__builtin_wcscmp(kFoobar, kFoobazfoobar + 6) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} static_assert(__builtin_wcsncmp(L"abaa", L"abba", 5) == -1); static_assert(__builtin_wcsncmp(L"abaa", L"abba", 4) == -1); static_assert(__builtin_wcsncmp(L"abaa", L"abba", 3) == -1); static_assert(__builtin_wcsncmp(L"abaa", L"abba", 2) == 0); static_assert(__builtin_wcsncmp(L"abaa", L"abba", 1) == 0); static_assert(__builtin_wcsncmp(L"abaa", L"abba", 0) == 0); static_assert(__builtin_wcsncmp(0, 0, 0) == 0); static_assert(__builtin_wcsncmp(L"abab\0banana", L"abab\0canada", 100) == 0); #if __WCHAR_WIDTH__ == 32 static_assert(__builtin_wcsncmp(L"a\x83838383", L"aa", 2) == (wchar_t)-1U >> 31); #endif static_assert(__builtin_wcsncmp(kFoobar, kFoobazfoobar, 6) == -1); static_assert(__builtin_wcsncmp(kFoobar, kFoobazfoobar, 7) == -1); // FIXME: Should we reject this? static_assert(__builtin_wcsncmp(kFoobar, kFoobazfoobar + 6, 6) == 0); static_assert(__builtin_wcsncmp(kFoobar, kFoobazfoobar + 6, 7) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} static_assert(__builtin_wmemcmp(L"abaa", L"abba", 3) == -1); static_assert(__builtin_wmemcmp(L"abaa", L"abba", 2) == 0); static_assert(__builtin_wmemcmp(0, 0, 0) == 0); #if __WCHAR_WIDTH__ == 32 static_assert(__builtin_wmemcmp(L"a\x83838383", L"aa", 2) == (wchar_t)-1U >> 31); #endif 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}} static_assert(__builtin_wmemcmp(L"abab\0banana", L"abab\0canada", 100) == -1); // FIXME: Should we reject this? static_assert(__builtin_wmemcmp(L"abab\0banana", L"abab\0canada", 7) == -1); static_assert(__builtin_wmemcmp(L"abab\0banana", L"abab\0canada", 6) == -1); static_assert(__builtin_wmemcmp(L"abab\0banana", L"abab\0canada", 5) == 0); 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}} 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}} 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}} } namespace StrchrEtc { constexpr const char *kStr = "abca\xff\0d"; constexpr char kFoo[] = {'f', 'o', 'o'}; static_assert(__builtin_strchr(kStr, 'a') == kStr); static_assert(__builtin_strchr(kStr, 'b') == kStr + 1); static_assert(__builtin_strchr(kStr, 'c') == kStr + 2); static_assert(__builtin_strchr(kStr, 'd') == nullptr); static_assert(__builtin_strchr(kStr, 'e') == nullptr); static_assert(__builtin_strchr(kStr, '\0') == kStr + 5); static_assert(__builtin_strchr(kStr, 'a' + 256) == nullptr); static_assert(__builtin_strchr(kStr, 'a' - 256) == nullptr); static_assert(__builtin_strchr(kStr, '\xff') == kStr + 4); static_assert(__builtin_strchr(kStr, '\xff' + 256) == nullptr); static_assert(__builtin_strchr(kStr, '\xff' - 256) == nullptr); static_assert(__builtin_strchr(kFoo, 'o') == kFoo + 1); static_assert(__builtin_strchr(kFoo, 'x') == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} static_assert(__builtin_strchr(nullptr, 'x') == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced null}} static_assert(__builtin_memchr(kStr, 'a', 0) == nullptr); static_assert(__builtin_memchr(kStr, 'a', 1) == kStr); static_assert(__builtin_memchr(kStr, '\0', 5) == nullptr); static_assert(__builtin_memchr(kStr, '\0', 6) == kStr + 5); static_assert(__builtin_memchr(kStr, '\xff', 8) == kStr + 4); static_assert(__builtin_memchr(kStr, '\xff' + 256, 8) == kStr + 4); static_assert(__builtin_memchr(kStr, '\xff' - 256, 8) == kStr + 4); static_assert(__builtin_memchr(kFoo, 'x', 3) == nullptr); static_assert(__builtin_memchr(kFoo, 'x', 4) == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} static_assert(__builtin_memchr(nullptr, 'x', 3) == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced null}} static_assert(__builtin_memchr(nullptr, 'x', 0) == nullptr); // FIXME: Should we reject this? constexpr const char8_t *kU8Str = u8"abca\xff\0d"; constexpr char8_t kU8Foo[] = {u8'f', u8'o', u8'o'}; static_assert(__builtin_memchr(kU8Str, u8'a', 0) == nullptr); static_assert(__builtin_memchr(kU8Str, u8'a', 1) == kU8Str); static_assert(__builtin_memchr(kU8Str, u8'\0', 5) == nullptr); static_assert(__builtin_memchr(kU8Str, u8'\0', 6) == kU8Str + 5); static_assert(__builtin_memchr(kU8Str, u8'\xff', 8) == kU8Str + 4); static_assert(__builtin_memchr(kU8Str, u8'\xff' + 256, 8) == kU8Str + 4); static_assert(__builtin_memchr(kU8Str, u8'\xff' - 256, 8) == kU8Str + 4); static_assert(__builtin_memchr(kU8Foo, u8'x', 3) == nullptr); static_assert(__builtin_memchr(kU8Foo, u8'x', 4) == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} static_assert(__builtin_memchr(nullptr, u8'x', 3) == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced null}} static_assert(__builtin_memchr(nullptr, u8'x', 0) == nullptr); // FIXME: Should we reject this? extern struct Incomplete incomplete; static_assert(__builtin_memchr(&incomplete, 0, 0u) == nullptr); static_assert(__builtin_memchr(&incomplete, 0, 1u) == nullptr); // expected-error {{not an integral constant}} expected-note {{read of incomplete type 'struct Incomplete'}} const unsigned char &u1 = 0xf0; auto &&i1 = (const signed char []){-128}; // expected-warning {{compound literals are a C99-specific feature}} static_assert(__builtin_memchr(&u1, -(0x0f + 1), 1) == &u1); static_assert(__builtin_memchr(i1, 0x80, 1) == i1); enum class E : unsigned char {}; struct EPair { E e, f; }; constexpr EPair ee{E{240}}; static_assert(__builtin_memchr(&ee.e, 240, 1) == &ee.e); // expected-error {{constant}} expected-note {{not supported}} constexpr bool kBool[] = {false, true, false}; constexpr const bool *const kBoolPastTheEndPtr = kBool + 3; static_assert(sizeof(bool) != 1u || __builtin_memchr(kBoolPastTheEndPtr - 3, 1, 99) == kBool + 1); // expected-error {{constant}} expected-note {{not supported}} static_assert(sizeof(bool) != 1u || __builtin_memchr(kBool + 1, 0, 99) == kBoolPastTheEndPtr - 1); // expected-error {{constant}} expected-note {{not supported}} static_assert(sizeof(bool) != 1u || __builtin_memchr(kBoolPastTheEndPtr - 3, -1, 3) == nullptr); // expected-error {{constant}} expected-note {{not supported}} static_assert(sizeof(bool) != 1u || __builtin_memchr(kBoolPastTheEndPtr, 0, 1) == nullptr); // expected-error {{constant}} expected-note {{not supported}} static_assert(__builtin_char_memchr(kStr, 'a', 0) == nullptr); static_assert(__builtin_char_memchr(kStr, 'a', 1) == kStr); static_assert(__builtin_char_memchr(kStr, '\0', 5) == nullptr); static_assert(__builtin_char_memchr(kStr, '\0', 6) == kStr + 5); static_assert(__builtin_char_memchr(kStr, '\xff', 8) == kStr + 4); static_assert(__builtin_char_memchr(kStr, '\xff' + 256, 8) == kStr + 4); static_assert(__builtin_char_memchr(kStr, '\xff' - 256, 8) == kStr + 4); static_assert(__builtin_char_memchr(kFoo, 'x', 3) == nullptr); static_assert(__builtin_char_memchr(kFoo, 'x', 4) == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} static_assert(__builtin_char_memchr(nullptr, 'x', 3) == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced null}} static_assert(__builtin_char_memchr(nullptr, 'x', 0) == nullptr); // FIXME: Should we reject this? static_assert(*__builtin_char_memchr(kStr, '\xff', 8) == '\xff'); constexpr bool char_memchr_mutable() { char buffer[] = "mutable"; *__builtin_char_memchr(buffer, 't', 8) = 'r'; *__builtin_char_memchr(buffer, 'm', 8) = 'd'; return __builtin_strcmp(buffer, "durable") == 0; } static_assert(char_memchr_mutable()); constexpr bool a = !strchr("hello", 'h'); // expected-error {{constant expression}} expected-note {{non-constexpr function 'strchr' cannot be used in a constant expression}} constexpr bool b = !memchr("hello", 'h', 3); // expected-error {{constant expression}} expected-note {{non-constexpr function 'memchr' cannot be used in a constant expression}} } namespace MultibyteElementTests::Memchr { constexpr unsigned int u04030201 = 0x04030201; static_assert(checkFoldResult( [](size_t n) constexpr { return __builtin_memchr(&u04030201, *ByteOrderString - '0', n); }, withN<1u>(), withExpected<&u04030201>())); constexpr unsigned int uED = 0xEDU; static_assert(checkFoldResult( [](size_t n) constexpr { return __builtin_memchr(&uED, 0xED, n); }, withN<1u>(), withExpected())); } namespace WcschrEtc { constexpr const wchar_t *kStr = L"abca\xffff\0dL"; constexpr wchar_t kFoo[] = {L'f', L'o', L'o'}; static_assert(__builtin_wcschr(kStr, L'a') == kStr); static_assert(__builtin_wcschr(kStr, L'b') == kStr + 1); static_assert(__builtin_wcschr(kStr, L'c') == kStr + 2); static_assert(__builtin_wcschr(kStr, L'd') == nullptr); static_assert(__builtin_wcschr(kStr, L'e') == nullptr); static_assert(__builtin_wcschr(kStr, L'\0') == kStr + 5); static_assert(__builtin_wcschr(kStr, L'a' + 256) == nullptr); static_assert(__builtin_wcschr(kStr, L'a' - 256) == nullptr); static_assert(__builtin_wcschr(kStr, L'\xffff') == kStr + 4); static_assert(__builtin_wcschr(kFoo, L'o') == kFoo + 1); static_assert(__builtin_wcschr(kFoo, L'x') == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} static_assert(__builtin_wcschr(nullptr, L'x') == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced null}} static_assert(__builtin_wmemchr(kStr, L'a', 0) == nullptr); static_assert(__builtin_wmemchr(kStr, L'a', 1) == kStr); static_assert(__builtin_wmemchr(kStr, L'\0', 5) == nullptr); static_assert(__builtin_wmemchr(kStr, L'\0', 6) == kStr + 5); static_assert(__builtin_wmemchr(kStr, L'\xffff', 8) == kStr + 4); static_assert(__builtin_wmemchr(kFoo, L'x', 3) == nullptr); static_assert(__builtin_wmemchr(kFoo, L'x', 4) == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}} static_assert(__builtin_wmemchr(nullptr, L'x', 3) == nullptr); // expected-error {{not an integral constant}} expected-note {{dereferenced null}} static_assert(__builtin_wmemchr(nullptr, L'x', 0) == nullptr); // FIXME: Should we reject this? 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}} 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}} } namespace MemcpyEtc { template constexpr T result(T (&arr)[4]) { return arr[0] * 1000 + arr[1] * 100 + arr[2] * 10 + arr[3]; } constexpr int test_memcpy(int a, int b, int n) { int arr[4] = {1, 2, 3, 4}; __builtin_memcpy(arr + a, arr + b, n); // expected-note@-1 2{{overlapping memory regions}} // expected-note@-2 {{size to copy (1) is not a multiple of size of element type 'int'}} // expected-note@-3 {{source is not a contiguous array of at least 2 elements of type 'int'}} // expected-note@-4 {{destination is not a contiguous array of at least 3 elements of type 'int'}} return result(arr); } constexpr int test_memmove(int a, int b, int n) { int arr[4] = {1, 2, 3, 4}; __builtin_memmove(arr + a, arr + b, n); // expected-note@-1 {{size to copy (1) is not a multiple of size of element type 'int'}} // expected-note@-2 {{source is not a contiguous array of at least 2 elements of type 'int'}} // expected-note@-3 {{destination is not a contiguous array of at least 3 elements of type 'int'}} return result(arr); } constexpr int test_wmemcpy(int a, int b, int n) { wchar_t arr[4] = {1, 2, 3, 4}; __builtin_wmemcpy(arr + a, arr + b, n); // expected-note@-1 2{{overlapping memory regions}} // expected-note@-2 {{source is not a contiguous array of at least 2 elements of type 'wchar_t'}} // expected-note@-3 {{destination is not a contiguous array of at least 3 elements of type 'wchar_t'}} return result(arr); } constexpr int test_wmemmove(int a, int b, int n) { wchar_t arr[4] = {1, 2, 3, 4}; __builtin_wmemmove(arr + a, arr + b, n); // expected-note@-1 {{source is not a contiguous array of at least 2 elements of type 'wchar_t'}} // expected-note@-2 {{destination is not a contiguous array of at least 3 elements of type 'wchar_t'}} return result(arr); } static_assert(test_memcpy(1, 2, 4) == 1334); static_assert(test_memcpy(2, 1, 4) == 1224); static_assert(test_memcpy(0, 1, 8) == 2334); // expected-error {{constant}} expected-note {{in call}} static_assert(test_memcpy(1, 0, 8) == 1124); // expected-error {{constant}} expected-note {{in call}} static_assert(test_memcpy(1, 2, 1) == 1334); // expected-error {{constant}} expected-note {{in call}} static_assert(test_memcpy(0, 3, 4) == 4234); static_assert(test_memcpy(0, 3, 8) == 4234); // expected-error {{constant}} expected-note {{in call}} static_assert(test_memcpy(2, 0, 12) == 4234); // expected-error {{constant}} expected-note {{in call}} static_assert(test_memmove(1, 2, 4) == 1334); static_assert(test_memmove(2, 1, 4) == 1224); static_assert(test_memmove(0, 1, 8) == 2334); static_assert(test_memmove(1, 0, 8) == 1124); static_assert(test_memmove(1, 2, 1) == 1334); // expected-error {{constant}} expected-note {{in call}} static_assert(test_memmove(0, 3, 4) == 4234); static_assert(test_memmove(0, 3, 8) == 4234); // expected-error {{constant}} expected-note {{in call}} static_assert(test_memmove(2, 0, 12) == 4234); // expected-error {{constant}} expected-note {{in call}} static_assert(test_wmemcpy(1, 2, 1) == 1334); static_assert(test_wmemcpy(2, 1, 1) == 1224); static_assert(test_wmemcpy(0, 1, 2) == 2334); // expected-error {{constant}} expected-note {{in call}} static_assert(test_wmemcpy(1, 0, 2) == 1124); // expected-error {{constant}} expected-note {{in call}} static_assert(test_wmemcpy(1, 2, 1) == 1334); static_assert(test_wmemcpy(0, 3, 1) == 4234); static_assert(test_wmemcpy(0, 3, 2) == 4234); // expected-error {{constant}} expected-note {{in call}} static_assert(test_wmemcpy(2, 0, 3) == 4234); // expected-error {{constant}} expected-note {{in call}} static_assert(test_wmemmove(1, 2, 1) == 1334); static_assert(test_wmemmove(2, 1, 1) == 1224); static_assert(test_wmemmove(0, 1, 2) == 2334); static_assert(test_wmemmove(1, 0, 2) == 1124); static_assert(test_wmemmove(1, 2, 1) == 1334); static_assert(test_wmemmove(0, 3, 1) == 4234); static_assert(test_wmemmove(0, 3, 2) == 4234); // expected-error {{constant}} expected-note {{in call}} static_assert(test_wmemmove(2, 0, 3) == 4234); // expected-error {{constant}} expected-note {{in call}} #define fold(x) (__builtin_constant_p(0) ? (x) : (x)) wchar_t global; constexpr wchar_t *null = 0; static_assert(__builtin_memcpy(&global, null, sizeof(wchar_t))); // expected-error {{}} expected-note {{source of 'memcpy' is nullptr}} static_assert(__builtin_memmove(&global, null, sizeof(wchar_t))); // expected-error {{}} expected-note {{source of 'memmove' is nullptr}} static_assert(__builtin_wmemcpy(&global, null, sizeof(wchar_t))); // expected-error {{}} expected-note {{source of 'wmemcpy' is nullptr}} static_assert(__builtin_wmemmove(&global, null, sizeof(wchar_t))); // expected-error {{}} expected-note {{source of 'wmemmove' is nullptr}} static_assert(__builtin_memcpy(null, &global, sizeof(wchar_t))); // expected-error {{}} expected-note {{destination of 'memcpy' is nullptr}} static_assert(__builtin_memmove(null, &global, sizeof(wchar_t))); // expected-error {{}} expected-note {{destination of 'memmove' is nullptr}} static_assert(__builtin_wmemcpy(null, &global, sizeof(wchar_t))); // expected-error {{}} expected-note {{destination of 'wmemcpy' is nullptr}} static_assert(__builtin_wmemmove(null, &global, sizeof(wchar_t))); // expected-error {{}} expected-note {{destination of 'wmemmove' is nullptr}} static_assert(__builtin_memcpy(&global, fold((wchar_t*)123), sizeof(wchar_t))); // expected-error {{}} expected-note {{source of 'memcpy' is (void *)123}} static_assert(__builtin_memcpy(fold(reinterpret_cast(123)), &global, sizeof(wchar_t))); // expected-error {{}} expected-note {{destination of 'memcpy' is (void *)123}} constexpr struct Incomplete *null_incomplete = 0; static_assert(__builtin_memcpy(null_incomplete, null_incomplete, sizeof(wchar_t))); // expected-error {{}} expected-note {{source of 'memcpy' is nullptr}} // Copying is permitted for any trivially-copyable type. struct Trivial { char k; short s; constexpr bool ok() { return k == 3 && s == 4; } }; constexpr bool test_trivial() { Trivial arr[3] = {{1, 2}, {3, 4}, {5, 6}}; __builtin_memcpy(arr, arr+1, sizeof(Trivial)); __builtin_memmove(arr+1, arr, 2 * sizeof(Trivial)); return arr[0].ok() && arr[1].ok() && arr[2].ok(); } static_assert(test_trivial()); // But not for a non-trivially-copyable type. struct NonTrivial { constexpr NonTrivial() : n(0) {} constexpr NonTrivial(const NonTrivial &) : n(1) {} int n; }; constexpr bool test_nontrivial_memcpy() { // expected-error {{never produces a constant}} NonTrivial arr[3] = {}; __builtin_memcpy(arr, arr + 1, sizeof(NonTrivial)); // expected-note 2{{non-trivially-copyable}} return true; } static_assert(test_nontrivial_memcpy()); // expected-error {{constant}} expected-note {{in call}} constexpr bool test_nontrivial_memmove() { // expected-error {{never produces a constant}} NonTrivial arr[3] = {}; __builtin_memcpy(arr, arr + 1, sizeof(NonTrivial)); // expected-note 2{{non-trivially-copyable}} return true; } static_assert(test_nontrivial_memmove()); // expected-error {{constant}} expected-note {{in call}} // Type puns via constant evaluated memcpy are not supported yet. constexpr float type_pun(const unsigned &n) { float f = 0.0f; __builtin_memcpy(&f, &n, 4); // expected-note {{cannot constant evaluate 'memcpy' from object of type 'const unsigned int' to object of type 'float'}} return f; } static_assert(type_pun(0x3f800000) == 1.0f); // expected-error {{constant}} expected-note {{in call}} // Make sure we're not confused by derived-to-base conversions. struct Base { int a; }; struct Derived : Base { int b; }; constexpr int test_derived_to_base(int n) { Derived arr[2] = {1, 2, 3, 4}; Base *p = &arr[0]; Base *q = &arr[1]; __builtin_memcpy(p, q, sizeof(Base) * n); // expected-note {{source is not a contiguous array of at least 2 elements of type 'MemcpyEtc::Base'}} return arr[0].a * 1000 + arr[0].b * 100 + arr[1].a * 10 + arr[1].b; } static_assert(test_derived_to_base(0) == 1234); static_assert(test_derived_to_base(1) == 3234); // FIXME: We could consider making this work by stripping elements off both // designators until we have a long enough matching size, if both designators // point to the start of their respective final elements. static_assert(test_derived_to_base(2) == 3434); // expected-error {{constant}} expected-note {{in call}} // Check that when address-of an array is passed to a tested function the // array can be fully copied. constexpr int test_address_of_const_array_type() { int arr[4] = {1, 2, 3, 4}; __builtin_memmove(&arr, &arr, sizeof(arr)); return arr[0] * 1000 + arr[1] * 100 + arr[2] * 10 + arr[3]; } static_assert(test_address_of_const_array_type() == 1234); // Check that an incomplete array is rejected. constexpr int test_incomplete_array_type() { // expected-error {{never produces a constant}} extern int arr[]; __builtin_memmove(arr, arr, 4 * sizeof(arr[0])); // expected-note@-1 2{{'memmove' not supported: source is not a contiguous array of at least 4 elements of type 'int'}} return arr[0] * 1000 + arr[1] * 100 + arr[2] * 10 + arr[3]; } static_assert(test_incomplete_array_type() == 1234); // expected-error {{constant}} expected-note {{in call}} // Check that a pointer to an incomplete array is rejected. constexpr int test_address_of_incomplete_array_type() { // expected-error {{never produces a constant}} extern int arr[]; __builtin_memmove(&arr, &arr, 4 * sizeof(arr[0])); // expected-note@-1 2{{cannot constant evaluate 'memmove' between objects of incomplete type 'int []'}} return arr[0] * 1000 + arr[1] * 100 + arr[2] * 10 + arr[3]; } static_assert(test_address_of_incomplete_array_type() == 1234); // expected-error {{constant}} expected-note {{in call}} // Check that a pointer to an incomplete struct is rejected. constexpr bool test_address_of_incomplete_struct_type() { // expected-error {{never produces a constant}} struct Incomplete; extern Incomplete x, y; __builtin_memcpy(&x, &x, 4); // expected-note@-1 2{{cannot constant evaluate 'memcpy' between objects of incomplete type 'Incomplete'}} return true; } static_assert(test_address_of_incomplete_struct_type()); // expected-error {{constant}} expected-note {{in call}} }