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author | Abseil Team <absl-team@google.com> | 2020-03-31T19·32-0700 |
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committer | Andy Getz <durandal@google.com> | 2020-03-31T20·34-0400 |
commit | fba8a316c30690097de5d6127ad307d84a1b74ca (patch) | |
tree | 952cde69de3f0bca33453bf166514711e3abd5e0 /absl/strings/cord_test.cc | |
parent | 79e0dc11514df035a8d07a356f9ee1800fb2160c (diff) |
Export of internal Abseil changes
-- 2dd5008c7b4176859e320c7c337078adb173b662 by Tom Manshreck <shreck@google.com>: Internal change PiperOrigin-RevId: 304022549 -- 6442abd78697b03cfe698b0d0dac7f1eb4b5cb38 by Andy Getzendanner <durandal@google.com>: Internal change PiperOrigin-RevId: 303890410 -- eb8b37b468b0f23da09d3de714272928ef61f942 by Gennadiy Rozental <rogeeff@google.com>: Roll changes forward with ChunkIterator templatized. This should facilitate usage of "small" chunk iterator for a regular usage and proper "big" iterator internally in Cord implementation. This way Cord users are not exposed to stack size overhead if they have a lot of chunk iterators or recursive implementation which relies on chunk iterators. PiperOrigin-RevId: 303877118 -- 9623c569e7c55b45254e95f2d14c5badf9c901aa by Gennadiy Rozental <rogeeff@google.com>: Switch Flags implementation of fast type id to use absl/base/internal/fast_type_id.h PiperOrigin-RevId: 303861019 -- e2931e8d53c86d0816da6bbc8ba58cf5a3a443bb by Matthew Brown <matthewbr@google.com>: Internal Change PiperOrigin-RevId: 303832407 -- b549ed6e441e920b8ad6f02a80b9fd543820ef86 by Tom Manshreck <shreck@google.com>: Update Cord header file comments to Abseil standards PiperOrigin-RevId: 303823232 -- fc633d4f31a2d058f2b6a7029fc7c9820cd71c92 by Evan Brown <ezb@google.com>: Remove top-level const from K/V in map_slot_type::mutable_value and map_slot_type::key. This allows us to move between `map_slot_type::mutable_value`s internally even when the key_type and/or mapped_type specified by the user are const. PiperOrigin-RevId: 303811694 -- 909b3ce7cb3583ee9c374d36ff5f82bba02a1b64 by Derek Mauro <dmauro@google.com>: Add hardening assertions to the preconditions of absl::Cord PiperOrigin-RevId: 303419537 -- 9d32f79eabd54e6cb17bcc28b53e9bcfeb3cf6f4 by Greg Falcon <gfalcon@google.com>: Don't use MSVC-specific bit manipulations when using Clang on Windows. This fixes a compiler warning. Note that we do not have continuous testing for this configuration; this CL is best-effort support. PiperOrigin-RevId: 303322582 -- f6e0a35a2b9081d2a9eef73789b7bc1b5e46e5ad by Gennadiy Rozental <rogeeff@google.com>: Introduce standlone FastTypeId utility to represent compile time unique type id. PiperOrigin-RevId: 303180545 -- 99120e9fbdb5b2d327139ab8f617533d7bc3345b by Abseil Team <absl-team@google.com>: Changed absl's import of std::string_view to using string_view = std::string_view. This should help tools (e.g. include-what-you-use) discover where absl::string_view is defined. PiperOrigin-RevId: 303169095 GitOrigin-RevId: 2dd5008c7b4176859e320c7c337078adb173b662 Change-Id: I1e18ae08e23686ac963e7ea5e5bd499e18d51048
Diffstat (limited to 'absl/strings/cord_test.cc')
-rw-r--r-- | absl/strings/cord_test.cc | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/absl/strings/cord_test.cc b/absl/strings/cord_test.cc index 4afa4a26969d..0ec93b4c45b9 100644 --- a/absl/strings/cord_test.cc +++ b/absl/strings/cord_test.cc @@ -18,6 +18,7 @@ #include "absl/base/config.h" #include "absl/base/internal/endian.h" #include "absl/base/internal/raw_logging.h" +#include "absl/base/macros.h" #include "absl/container/fixed_array.h" #include "absl/strings/cord_test_helpers.h" #include "absl/strings/str_cat.h" @@ -1402,6 +1403,53 @@ TEST(CordChunkIterator, Operations) { VerifyChunkIterator(subcords, 128); } +TEST(CordChunkIterator, MaxLengthFullTree) { + // Start with a 1-byte cord, and then double its length in a loop. We should + // be able to do this until the point where we would overflow size_t. + + absl::Cord cord; + size_t size = 1; + AddExternalMemory("x", &cord); + EXPECT_EQ(cord.size(), size); + + const int kCordLengthDoublingLimit = std::numeric_limits<size_t>::digits - 1; + for (int i = 0; i < kCordLengthDoublingLimit; ++i) { + cord.Prepend(absl::Cord(cord)); + size <<= 1; + + EXPECT_EQ(cord.size(), size); + + auto chunk_it = cord.chunk_begin(); + EXPECT_EQ(*chunk_it, "x"); + } + + EXPECT_DEATH_IF_SUPPORTED( + (cord.Prepend(absl::Cord(cord)), *cord.chunk_begin()), + "Cord is too long"); +} + +TEST(CordChunkIterator, MaxDepth) { + // By reusing nodes, it's possible in pathological cases to build a Cord that + // exceeds both the maximum permissible length and depth. In this case, the + // violation of the maximum depth is reported. + absl::Cord left_child; + AddExternalMemory("x", &left_child); + absl::Cord root = left_child; + + for (int i = 0; i < absl::cord_internal::MaxCordDepth() - 2; ++i) { + size_t new_size = left_child.size() + root.size(); + root.Prepend(left_child); + EXPECT_EQ(root.size(), new_size); + + auto chunk_it = root.chunk_begin(); + EXPECT_EQ(*chunk_it, "x"); + + std::swap(left_child, root); + } + + EXPECT_DEATH_IF_SUPPORTED(root.Prepend(left_child), "Cord is too long"); +} + TEST(CordCharIterator, Traits) { static_assert(std::is_copy_constructible<absl::Cord::CharIterator>::value, ""); @@ -1580,3 +1628,23 @@ TEST(Cord, SmallBufferAssignFromOwnData) { } } } + +TEST(CordDeathTest, Hardening) { + absl::Cord cord("hello"); + // These statement should abort the program in all builds modes. + EXPECT_DEATH_IF_SUPPORTED(cord.RemovePrefix(6), ""); + EXPECT_DEATH_IF_SUPPORTED(cord.RemoveSuffix(6), ""); + + bool test_hardening = false; + ABSL_HARDENING_ASSERT([&]() { + // This only runs when ABSL_HARDENING_ASSERT is active. + test_hardening = true; + return true; + }()); + if (!test_hardening) return; + + EXPECT_DEATH_IF_SUPPORTED(cord[5], ""); + EXPECT_DEATH_IF_SUPPORTED(*cord.chunk_end(), ""); + EXPECT_DEATH_IF_SUPPORTED(static_cast<void>(cord.chunk_end()->empty()), ""); + EXPECT_DEATH_IF_SUPPORTED(++cord.chunk_end(), ""); +} |