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author | Abseil Team <absl-team@google.com> | 2020-02-25 22:27:31 +0100 |
---|---|---|
committer | CJ Johnson <johnsoncj@google.com> | 2020-02-25 17:56:58 -0500 |
commit | b832dce8489ef7b6231384909fd9b68d5a5ff2b7 (patch) | |
tree | 3ad4be9a9a4105366be714da9458e076a77be18f /absl/strings/string_view_test.cc | |
parent | aa844899c937bde5d2b24f276b59997e5b668bde (diff) |
Creation of LTS branch "lts_2020_02_25"20200225
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GitOrigin-RevId: 0033c9ea91a52ade7c6b725aa2ef3cbe15463421
Change-Id: I8a2b70063cb3ab40c6943a6db0fe40cae71ed8d7
Diffstat (limited to 'absl/strings/string_view_test.cc')
-rw-r--r-- | absl/strings/string_view_test.cc | 117 |
1 files changed, 106 insertions, 11 deletions
diff --git a/absl/strings/string_view_test.cc b/absl/strings/string_view_test.cc index 22d43536..7b1d56fa 100644 --- a/absl/strings/string_view_test.cc +++ b/absl/strings/string_view_test.cc @@ -29,7 +29,8 @@ #include "absl/base/config.h" #include "absl/base/dynamic_annotations.h" -#ifdef __ANDROID__ +#if defined(ABSL_HAVE_STD_STRING_VIEW) || defined(__ANDROID__) +// We don't control the death messaging when using std::string_view. // Android assert messages only go to system log, so death tests cannot inspect // the message for matching. #define ABSL_EXPECT_DEATH_IF_SUPPORTED(statement, regex) \ @@ -372,7 +373,7 @@ TEST(StringViewTest, STL1) { #ifdef ABSL_HAVE_EXCEPTIONS EXPECT_THROW(a.copy(buf, 1, 27), std::out_of_range); #else - EXPECT_DEATH(a.copy(buf, 1, 27), "absl::string_view::copy"); + ABSL_EXPECT_DEATH_IF_SUPPORTED(a.copy(buf, 1, 27), "absl::string_view::copy"); #endif } @@ -686,7 +687,8 @@ TEST(StringViewTest, STL2Substr) { #ifdef ABSL_HAVE_EXCEPTIONS EXPECT_THROW((void)a.substr(99, 2), std::out_of_range); #else - EXPECT_DEATH((void)a.substr(99, 2), "absl::string_view::substr"); + ABSL_EXPECT_DEATH_IF_SUPPORTED((void)a.substr(99, 2), + "absl::string_view::substr"); #endif } @@ -816,21 +818,35 @@ TEST(StringViewTest, FrontBackSingleChar) { EXPECT_EQ(&c, &csp.back()); } +TEST(StringViewTest, FrontBackEmpty) { +#ifndef ABSL_USES_STD_STRING_VIEW +#ifndef NDEBUG + // Abseil's string_view implementation has debug assertions that check that + // front() and back() are not called on an empty string_view. + absl::string_view sv; + ABSL_EXPECT_DEATH_IF_SUPPORTED(sv.front(), ""); + ABSL_EXPECT_DEATH_IF_SUPPORTED(sv.back(), ""); +#endif +#endif +} + // `std::string_view::string_view(const char*)` calls // `std::char_traits<char>::length(const char*)` to get the string length. In // libc++, it doesn't allow `nullptr` in the constexpr context, with the error // "read of dereferenced null pointer is not allowed in a constant expression". // At run time, the behavior of `std::char_traits::length()` on `nullptr` is // undefined by the standard and usually results in crash with libc++. +// GCC also started rejected this in libstdc++ starting in GCC9. // In MSVC, creating a constexpr string_view from nullptr also triggers an // "unevaluable pointer value" error. This compiler implementation conforms // to the standard, but `absl::string_view` implements a different // behavior for historical reasons. We work around tests that construct // `string_view` from `nullptr` when using libc++. -#if !defined(ABSL_HAVE_STD_STRING_VIEW) || \ - (!defined(_LIBCPP_VERSION) && !defined(_MSC_VER)) +#if !defined(ABSL_USES_STD_STRING_VIEW) || \ + (!(defined(_GLIBCXX_RELEASE) && _GLIBCXX_RELEASE >= 9) && \ + !defined(_LIBCPP_VERSION) && !defined(_MSC_VER)) #define ABSL_HAVE_STRING_VIEW_FROM_NULLPTR 1 -#endif // !defined(ABSL_HAVE_STD_STRING_VIEW) || !defined(_LIBCPP_VERSION) +#endif TEST(StringViewTest, NULLInput) { absl::string_view s; @@ -892,6 +908,18 @@ TEST(StringViewTest, Comparisons2) { EXPECT_LT(digits.compare(0, npos, "0123456789", 3, 5), 0); // 6 } +TEST(StringViewTest, At) { + absl::string_view abc = "abc"; + EXPECT_EQ(abc.at(0), 'a'); + EXPECT_EQ(abc.at(1), 'b'); + EXPECT_EQ(abc.at(2), 'c'); +#ifdef ABSL_HAVE_EXCEPTIONS + EXPECT_THROW(abc.at(3), std::out_of_range); +#else + ABSL_EXPECT_DEATH_IF_SUPPORTED(abc.at(3), "absl::string_view::at"); +#endif +} + struct MyCharAlloc : std::allocator<char> {}; TEST(StringViewTest, ExplicitConversionOperator) { @@ -915,6 +943,31 @@ TEST(StringViewTest, NullSafeStringView) { } } +TEST(StringViewTest, ConstexprNullSafeStringView) { + { + constexpr absl::string_view s = absl::NullSafeStringView(nullptr); + EXPECT_EQ(nullptr, s.data()); + EXPECT_EQ(0, s.size()); + EXPECT_EQ(absl::string_view(), s); + } +#if !defined(_MSC_VER) || _MSC_VER >= 1910 + // MSVC 2017+ is required for good constexpr string_view support. + // See the implementation of `absl::string_view::StrlenInternal()`. + { + static constexpr char kHi[] = "hi"; + absl::string_view s = absl::NullSafeStringView(kHi); + EXPECT_EQ(kHi, s.data()); + EXPECT_EQ(strlen(kHi), s.size()); + EXPECT_EQ(absl::string_view("hi"), s); + } + { + constexpr absl::string_view s = absl::NullSafeStringView("hello"); + EXPECT_EQ(s.size(), 5); + EXPECT_EQ("hello", s); + } +#endif +} + TEST(StringViewTest, ConstexprCompiles) { constexpr absl::string_view sp; #ifdef ABSL_HAVE_STRING_VIEW_FROM_NULLPTR @@ -922,7 +975,7 @@ TEST(StringViewTest, ConstexprCompiles) { #endif constexpr absl::string_view cstr_len("cstr", 4); -#if defined(ABSL_HAVE_STD_STRING_VIEW) +#if defined(ABSL_USES_STD_STRING_VIEW) // In libstdc++ (as of 7.2), `std::string_view::string_view(const char*)` // calls `std::char_traits<char>::length(const char*)` to get the std::string // length, but it is not marked constexpr yet. See GCC bug: @@ -936,7 +989,7 @@ TEST(StringViewTest, ConstexprCompiles) { #define ABSL_HAVE_CONSTEXPR_STRING_VIEW_FROM_CSTR 1 #endif // !__GLIBCXX__ -#else // ABSL_HAVE_STD_STRING_VIEW +#else // ABSL_USES_STD_STRING_VIEW // This duplicates the check for __builtin_strlen in the header. #if ABSL_HAVE_BUILTIN(__builtin_strlen) || \ @@ -951,13 +1004,36 @@ TEST(StringViewTest, ConstexprCompiles) { #define ABSL_HAVE_CONSTEXPR_STRING_VIEW_FROM_CSTR 1 #endif -#endif // ABSL_HAVE_STD_STRING_VIEW +#endif // ABSL_USES_STD_STRING_VIEW #ifdef ABSL_HAVE_CONSTEXPR_STRING_VIEW_FROM_CSTR constexpr absl::string_view cstr_strlen("foo"); EXPECT_EQ(cstr_strlen.length(), 3); constexpr absl::string_view cstr_strlen2 = "bar"; EXPECT_EQ(cstr_strlen2, "bar"); + +#if ABSL_HAVE_BUILTIN(__builtin_memcmp) || \ + (defined(__GNUC__) && !defined(__clang__)) +#define ABSL_HAVE_CONSTEXPR_STRING_VIEW_COMPARISON 1 +#endif +#ifdef ABSL_HAVE_CONSTEXPR_STRING_VIEW_COMPARISON + constexpr absl::string_view foo = "foo"; + constexpr absl::string_view bar = "bar"; + constexpr bool foo_eq_bar = foo == bar; + constexpr bool foo_ne_bar = foo != bar; + constexpr bool foo_lt_bar = foo < bar; + constexpr bool foo_le_bar = foo <= bar; + constexpr bool foo_gt_bar = foo > bar; + constexpr bool foo_ge_bar = foo >= bar; + constexpr int foo_compare_bar = foo.compare(bar); + EXPECT_FALSE(foo_eq_bar); + EXPECT_TRUE(foo_ne_bar); + EXPECT_FALSE(foo_lt_bar); + EXPECT_FALSE(foo_le_bar); + EXPECT_TRUE(foo_gt_bar); + EXPECT_TRUE(foo_ge_bar); + EXPECT_GT(foo_compare_bar, 0); +#endif #endif #if !defined(__clang__) || 3 < __clang_major__ || \ @@ -979,8 +1055,16 @@ TEST(StringViewTest, ConstexprCompiles) { constexpr absl::string_view::iterator const_end = cstr_len.end(); constexpr absl::string_view::size_type const_size = cstr_len.size(); constexpr absl::string_view::size_type const_length = cstr_len.length(); + static_assert(const_begin + const_size == const_end, + "pointer arithmetic check"); + static_assert(const_begin + const_length == const_end, + "pointer arithmetic check"); +#ifndef _MSC_VER + // MSVC has bugs doing constexpr pointer arithmetic. + // https://developercommunity.visualstudio.com/content/problem/482192/bad-pointer-arithmetic-in-constepxr-2019-rc1-svc1.html EXPECT_EQ(const_begin + const_size, const_end); EXPECT_EQ(const_begin + const_length, const_end); +#endif constexpr bool isempty = sp.empty(); EXPECT_TRUE(isempty); @@ -1036,6 +1120,17 @@ TEST(StringViewTest, Noexcept) { EXPECT_TRUE(noexcept(sp.find_last_not_of('f'))); } +TEST(StringViewTest, BoundsCheck) { +#ifndef ABSL_USES_STD_STRING_VIEW +#ifndef NDEBUG + // Abseil's string_view implementation has bounds-checking in debug mode. + absl::string_view h = "hello"; + ABSL_EXPECT_DEATH_IF_SUPPORTED(h[5], ""); + ABSL_EXPECT_DEATH_IF_SUPPORTED(h[-1], ""); +#endif +#endif +} + TEST(ComparisonOpsTest, StringCompareNotAmbiguous) { EXPECT_EQ("hello", std::string("hello")); EXPECT_LT("hello", std::string("world")); @@ -1089,7 +1184,7 @@ TEST(HugeStringView, TwoPointTwoGB) { } #endif // THREAD_SANITIZER -#if !defined(NDEBUG) && !defined(ABSL_HAVE_STD_STRING_VIEW) +#if !defined(NDEBUG) && !defined(ABSL_USES_STD_STRING_VIEW) TEST(NonNegativeLenTest, NonNegativeLen) { ABSL_EXPECT_DEATH_IF_SUPPORTED(absl::string_view("xyz", -1), "len <= kMaxSize"); @@ -1105,7 +1200,7 @@ TEST(LenExceedsMaxSizeTest, LenExceedsMaxSize) { ABSL_EXPECT_DEATH_IF_SUPPORTED(absl::string_view("", max_size + 1), "len <= kMaxSize"); } -#endif // !defined(NDEBUG) && !defined(ABSL_HAVE_STD_STRING_VIEW) +#endif // !defined(NDEBUG) && !defined(ABSL_USES_STD_STRING_VIEW) class StringViewStreamTest : public ::testing::Test { public: |