forked from OSchip/llvm-project
69 lines
4.1 KiB
C++
69 lines
4.1 KiB
C++
// RUN: %clang_cc1 %s -std=c++1z -fsyntax-only -verify -pedantic
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# 4 "/usr/include/string.h" 1 3 4
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extern "C" {
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typedef decltype(sizeof(int)) size_t;
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extern size_t strlen(const char *p);
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extern int strcmp(const char *s1, const char *s2);
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extern int strncmp(const char *s1, const char *s2, size_t n);
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extern int memcmp(const char *s1, const char *s2, size_t n); // expected-note {{here}}
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}
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# 15 "SemaCXX/constexpr-string.cpp" 2
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namespace Strlen {
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constexpr int n = __builtin_strlen("hello"); // ok
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constexpr int m = strlen("hello"); // expected-error {{constant expression}} expected-note {{non-constexpr function 'strlen' cannot be used in a constant expression}}
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// Make sure we can evaluate a call to strlen.
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int arr[3]; // expected-note {{here}}
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int k = arr[strlen("hello")]; // expected-warning {{array index 5}}
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}
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namespace StrcmpEtc {
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constexpr char kFoobar[6] = {'f','o','o','b','a','r'};
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constexpr char kFoobazfoobar[12] = {'f','o','o','b','a','z','f','o','o','b','a','r'};
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static_assert(__builtin_strcmp("abab", "abab") == 0);
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static_assert(__builtin_strcmp("abab", "abba") == -1);
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static_assert(__builtin_strcmp("abab", "abaa") == 1);
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static_assert(__builtin_strcmp("ababa", "abab") == 1);
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static_assert(__builtin_strcmp("abab", "ababa") == -1);
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static_assert(__builtin_strcmp("abab\0banana", "abab") == 0);
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static_assert(__builtin_strcmp("abab", "abab\0banana") == 0);
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static_assert(__builtin_strcmp("abab\0banana", "abab\0canada") == 0);
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static_assert(__builtin_strcmp(0, "abab") == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced null}}
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static_assert(__builtin_strcmp("abab", 0) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced null}}
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static_assert(__builtin_strcmp(kFoobar, kFoobazfoobar) == -1); // FIXME: Should we reject this?
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static_assert(__builtin_strcmp(kFoobar, kFoobazfoobar + 6) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}}
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static_assert(__builtin_strncmp("abaa", "abba", 5) == -1);
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static_assert(__builtin_strncmp("abaa", "abba", 4) == -1);
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static_assert(__builtin_strncmp("abaa", "abba", 3) == -1);
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static_assert(__builtin_strncmp("abaa", "abba", 2) == 0);
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static_assert(__builtin_strncmp("abaa", "abba", 1) == 0);
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static_assert(__builtin_strncmp("abaa", "abba", 0) == 0);
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static_assert(__builtin_strncmp(0, 0, 0) == 0);
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static_assert(__builtin_strncmp("abab\0banana", "abab\0canada", 100) == 0);
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static_assert(__builtin_strncmp(kFoobar, kFoobazfoobar, 6) == -1);
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static_assert(__builtin_strncmp(kFoobar, kFoobazfoobar, 7) == -1); // FIXME: Should we reject this?
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static_assert(__builtin_strncmp(kFoobar, kFoobazfoobar + 6, 6) == 0);
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static_assert(__builtin_strncmp(kFoobar, kFoobazfoobar + 6, 7) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}}
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static_assert(__builtin_memcmp("abaa", "abba", 3) == -1);
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static_assert(__builtin_memcmp("abaa", "abba", 2) == 0);
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static_assert(__builtin_memcmp(0, 0, 0) == 0);
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static_assert(__builtin_memcmp("abab\0banana", "abab\0banana", 100) == 0); // expected-error {{not an integral constant}} expected-note {{dereferenced one-past-the-end}}
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static_assert(__builtin_memcmp("abab\0banana", "abab\0canada", 100) == -1); // FIXME: Should we reject this?
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static_assert(__builtin_memcmp("abab\0banana", "abab\0canada", 7) == -1);
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static_assert(__builtin_memcmp("abab\0banana", "abab\0canada", 6) == -1);
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static_assert(__builtin_memcmp("abab\0banana", "abab\0canada", 5) == 0);
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constexpr int a = strcmp("hello", "world"); // expected-error {{constant expression}} expected-note {{non-constexpr function 'strcmp' cannot be used in a constant expression}}
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constexpr int b = strncmp("hello", "world", 3); // expected-error {{constant expression}} expected-note {{non-constexpr function 'strncmp' cannot be used in a constant expression}}
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constexpr int c = memcmp("hello", "world", 3); // expected-error {{constant expression}} expected-note {{non-constexpr function 'memcmp' cannot be used in a constant expression}}
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}
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