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-rw-r--r--absl/strings/string_view_test.cc117
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:
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-28 19:59:51 +0000