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* Speed up `raw_hash_map::[]` with ABSL hardening enabled by unchecking ↵Gravatar Abseil Team2024-01-12
| | | | | | | dereference of iterator returned by `try_emplace`. PiperOrigin-RevId: 597920257 Change-Id: I1b2e8f10a2f1efa763a6f0760294beafdb6fd9c0
* Enable ABSL_BTREE_ENABLE_GENERATIONS and ABSL_SWISSTABLE_ENABLE_GENERATIONS ↵Gravatar Abseil Team2024-01-11
| | | | | | | | | | | | | | with ABSL_HAVE_HWADDRESS_SANITIZER. It will detect bugs similar to Asan. Also updated related tests to pass with HWASAN. They are still flaky because of nature of HWASAN algorithm, but test can be update to avoid flakiness, which I will do in followup patches. PiperOrigin-RevId: 597613798 Change-Id: Ic8af36a268ca041c002eb561b946aa2d9b93996a
* Speed up `raw_hash_set::contains()` when ABSL hardening is enabled by ↵Gravatar Abseil Team2024-01-03
| | | | | | | removing the iterator invalidation check from the comparison that contains performs. PiperOrigin-RevId: 595460301 Change-Id: I9a5d6c81385e38184f4848c58209adc5d32bb7be
* Migrate static objects to NoDestructor in tests, testing libraries and ↵Gravatar Abseil Team2023-12-26
| | | | | | | benchmarks. PiperOrigin-RevId: 593918110 Change-Id: Ide100c69b10e28011af17c7f82bb10eea072cad4
* Unify btree EmptyNode allocation code across compilers.Gravatar Abseil Team2023-12-20
| | | | | | | | | We currently have a workaround for MSVC, which has constexpr pointer arithmetic bugs. The bug seems to still exist and the existing code for non-MSVC compilers doesn't build. This alternative constexpr constructor avoids pointer arithmetic and seems to be working for all, including MSVC. PiperOrigin-RevId: 592586957 Change-Id: Ic585693c3a7abaab5fbbc0954b8ee924994f8dbf
* Create and destroy tables outside of the timer and in batch in Reserve ↵Gravatar Abseil Team2023-12-20
| | | | | | | benchmarks. PiperOrigin-RevId: 592483250 Change-Id: I55fa9982c4dbc723b30957cb31da95251e368707
* Add a pragma to disable a maybe-uninitialized warning for GCC12+Gravatar Abseil Team2023-12-19
| | | | | PiperOrigin-RevId: 592301543 Change-Id: I97e4df805c7313896228430a50a7f991127f3e30
* Refactor `EraseMetaOnly` to speed up single group tables.Gravatar Abseil Team2023-12-19
| | | | | PiperOrigin-RevId: 592272653 Change-Id: I895c5786555227bdc88ab0a4cce8cf5ba65222a1
* Add the `BM_EraseEmplace` benchmark that constantly adds and removes the ↵Gravatar Abseil Team2023-12-18
| | | | | | | same element. PiperOrigin-RevId: 591987002 Change-Id: Ic1ed2063aeb95a6e814eefcbed024e1a5a1d8d2f
* Unit-tests to verify ABSL raw_hash_set does not double-hash in prodGravatar Abseil Team2023-12-12
| | | | | PiperOrigin-RevId: 590337123 Change-Id: Ib98bbb5a5dadbce5e891567038e016f4da2efc0b
* Add `MaskFull` to `Group`.Gravatar Abseil Team2023-12-12
| | | | | | | | | It is not used at the moment. Usage is planned to be submitted separately. Useful for faster iterating over all slots in the internal functions. PiperOrigin-RevId: 590300049 Change-Id: I081f33113268761db868771d29796d94c24e4e7a
* Small table growth optimization.Gravatar Abseil Team2023-12-07
| | | | | | | | | Details: - In case the table entirely fits into a single group size (`capacity <= Group::kWidth`), the order of elements is not important. - For growing upto Group::kWidth we rotate control bytes and slots deterministically (using memcpy). - We also avoid second find_first_non_full right after resize for small growing. PiperOrigin-RevId: 588825966 Change-Id: I09bd7fd489e3868dcf56c36b436805d08dae7ab5
* `btree_map`: avoid a copy in `map_params::key`.Gravatar Abseil Team2023-11-28
| | | | | PiperOrigin-RevId: 585892739 Change-Id: I30490dac5826bff2a33d9872f71154d360f9cc0d
* Make `FlatHashMapPolicy` return `std::true_type` for relocatable objects.Gravatar Abseil Team2023-11-20
| | | | | | | This reduces produced binary size and can trigger even more optimizations in the future. PiperOrigin-RevId: 584136517 Change-Id: I3854833799f88f28b755ec53132925f0c3d468ab
* Partial roll forward of reentrant validation with the validation itself ↵Gravatar Evan Brown2023-11-13
| | | | | | | disabled. This will make it easier to roll back and forwards in the future (if needed) without causing merge conflicts in unrelated code. PiperOrigin-RevId: 582059046 Change-Id: I66dc6527e7a0b351367b7a391c2d653fe793143f
* Roll back due to leak sanitizer reports.Gravatar Aaron Jacobs2023-11-08
| | | | | PiperOrigin-RevId: 580726428 Change-Id: I12b0f22c2084aef90bcca67536220a6bb550b57e
* Add control()/slot() functions to iterator/const_iterator.Gravatar Evan Brown2023-11-07
| | | | | | | | | This allows for avoiding e.g. it.inner_.slot_ on const iterators. Also, refactor HashtableDebugAccess::AllocatedByteSize to use regular iteration instead of looking directly at control/slot_array of the table in order to support small object optimization. PiperOrigin-RevId: 580194253 Change-Id: I64cd69287834ee5c7a8daf867c532258806bfb7b
* Update comments to make it explicit that moving a flat_hash_{set,map} can ↵Gravatar Evan Brown2023-11-02
| | | | | | | cause pointers to elements to be invalidated. PiperOrigin-RevId: 578920671 Change-Id: Ica40db48d5565b606e5e5f501c1305612b193d4d
* Add sanitizer mode validation for use of references to swisstables elements ↵Gravatar Evan Brown2023-11-01
| | | | | | | that may have been invalidated by a container move. PiperOrigin-RevId: 578649798 Change-Id: Icfee98d3a0399b545ec6ec59c5b52ae5e006218b
* Roll forward: Add sanitizer mode checks that element ↵Gravatar Evan Brown2023-10-30
| | | | | | | constructors/destructors don't make reentrant calls to raw_hash_set member functions. PiperOrigin-RevId: 577877803 Change-Id: I254c589b00cadec6ff95dfd60a8a38ab303c1af5
* Rollback: Add sanitizer mode checks that element constructors/destructors ↵Gravatar Evan Brown2023-10-17
| | | | | | | don't make reentrant calls to raw_hash_set member functions. PiperOrigin-RevId: 574232718 Change-Id: I8ef25fec00b76ee5fb9424e7614ca55edd6ba81b
* Add sanitizer mode checks that element constructors/destructors don't make ↵Gravatar Evan Brown2023-10-16
| | | | | | | reentrant calls to raw_hash_set member functions. PiperOrigin-RevId: 573897598 Change-Id: If40c23ac3cd9fff315ee18774e27c480cbca3a81
* Add iterator invalidation checking for when the hashtable is moved.Gravatar Evan Brown2023-10-16
| | | | | | Motivation: once we enable small object optimization in swisstable, iterators can be invalidated when the table is moved. PiperOrigin-RevId: 573884505 Change-Id: I4278129829143d3747dfd0ef0ff92f321c2633dc
* Add missing headers in raw_hash_map.h.Gravatar Evan Brown2023-10-12
| | | | | PiperOrigin-RevId: 572979536 Change-Id: I4fceee0c52e4e6877e639860327462c7874719e7
* The current implementation of control by checking on x86 has an unnecessary ↵Gravatar Abseil Team2023-10-12
| | | | | | | | | sign extension after the doing the control byte comparison. Changing the bitmask object to explicitly track only 16 bits (instead of 32) eliminates this, saving an instruction / cycle. This speeds up hit checking by up to 6% on Milan and up to 15% on CLX PiperOrigin-RevId: 572965182 Change-Id: Ifda0e3250d409266d6dcef89cba6ada91d879291
* Bazel: Enable the header_modules featureGravatar Derek Mauro2023-10-11
| | | | | PiperOrigin-RevId: 572575394 Change-Id: Ic1c5ac2423b1634e50c43bad6daa14e82a8f3e2c
* Bazel: Support layering_check and parse_headersGravatar Derek Mauro2023-10-10
| | | | | | | | | | | | | The layering_check feature ensures that rules that include a header explicitly depend on a rule that exports that header. Compiler support is required, and currently only Clang 16+ supports diagnoses layering_check failures. The parse_headers feature ensures headers are self-contained by compiling them with -fsyntax-only on supported compilers. PiperOrigin-RevId: 572350144 Change-Id: I37297f761566d686d9dd58d318979d688b7e36d1
* Correct the grammar of an IWYU pragma.Gravatar Abseil Team2023-10-06
| | | | | PiperOrigin-RevId: 571322393 Change-Id: I0e227b0075d3133ee28c8f766a1be7872c101176
* Fix a small typo in the docs.Gravatar Abseil Team2023-10-05
| | | | | PiperOrigin-RevId: 571084409 Change-Id: I4e6c98ac11f4cb40b65cc9484188faa6168718b4
* Use ABSL_RAW_LOG and ABSL_PREDICT_* for all debug checks in swisstable ↵Gravatar Evan Brown2023-10-03
| | | | | | | | | including sanitizer mode checks. Sanitizer mode can be used for canaries so performance is still relevant. This change also makes the code more uniform. PiperOrigin-RevId: 570438923 Change-Id: I62859160eb9323e6420680a43fd23e97e8a62389
* Refactor swisstable copy/move assignment to fix issues with allocator ↵Gravatar Evan Brown2023-10-03
| | | | | | | | | | | | | | | | | propagation and improve performance. Correctness: - We use swap to implement copy assignment and move assignment, which means that allocator propagation in copy/move assignment depends on `propagate_on_container_swap` in addition to `propagate_on_container_copy_assignment`/`propagate_on_container_move_assignment`. - In swap, if `propagate_on_container_swap` is `false` and `get_allocator() != other.get_allocator()`, the behavior is undefined (https://en.cppreference.com/w/cpp/container/unordered_set/swap) - we should assert that this UB case isn't happening. For this reason, we also delete the NoPropagateOn_Swap test case in raw_hash_set_allocator_test. Performance: - Don't rely on swap so we don't have to do unnecessary copying into the moved-from sets. - Don't use temp sets in move assignment. - Default the move constructor of CommonFields. - Avoid using exchange in raw_hash_set move constructor. - In `raw_hash_set(raw_hash_set&& that, const allocator_type& a)` with unequal allocators and in move assignment with non-propagating unequal allocators, move set keys instead of copying them. PiperOrigin-RevId: 570419290 Change-Id: I499e54f17d9cb0b0836601f5c06187d1f269a5b8
* Minor build rule changes.Gravatar Evan Brown2023-10-02
| | | | | PiperOrigin-RevId: 570180405 Change-Id: If14b21a4d0df19546a47923a1f2a359b38fe6f93
* Re-submit with a fix for platforms without RTTI.Gravatar Abseil Team2023-10-02
| | | | | | | We test for `ABSL_INTERNAL_HAS_RTTI` in `absl::container_internal::TypeName` before calling `typeid`. PiperOrigin-RevId: 570101013 Change-Id: I1f2f9b2f475a6beae50d0b88718b17b296311155
* Export common.h from raw_hash_set.h to prevent IWYU from linting when using ↵Gravatar Abseil Team2023-09-27
| | | | | | | node_handle PiperOrigin-RevId: 568997790 Change-Id: I9899ccc95eeb9c8b92d0dceec7e2fc4a2b1102c0
* Add an internal wrapper for `abi::__cxa_demangle()`.Gravatar Abseil Team2023-09-26
| | | | | PiperOrigin-RevId: 568665135 Change-Id: I42ec9bc6cfe923777f7b60ea032c7b64428493c9
* Add an internal wrapper for `abi::__cxa_demangle()`.Gravatar Abseil Team2023-09-26
| | | | | PiperOrigin-RevId: 568652465 Change-Id: I9f72a11cb514eaf694dae589a19dc139891e7af2
* Replace BtreeAllocatorTest with individual test cases for copy/move/swap ↵Gravatar Evan Brown2023-09-21
| | | | | | | | | propagation (defined in test_allocator.h) and minimal alignment. Also remove some extraneous value_types from typed tests. The motivation is to reduce btree_test compile time. PiperOrigin-RevId: 567376572 Change-Id: I6ac6130b99faeadaedab8c2c7b05d5e23e77cc1e
* Use ABSL_PREDICT_FALSE and ABSL_RAW_LOG for shared safety checks in ↵Gravatar Daniel Cheng2023-09-20
| | | | | | | | | | | | | raw_hash_set. `SwisstableDebugEnabled()` is also true for release builds with hardening enabled. To minimize their impact in those builds: - use `ABSL_PREDICT_FALSE()` to provide a compiler hint for code layout - use `ABSL_RAW_LOG()` with a format string to reduce code size and improve the chances that the hot paths will be inlined. PiperOrigin-RevId: 567102494 Change-Id: I6734bd491d7b2e1fb9df0e86f4e29e6ad0a03102
* Fix a bug in which we used propagate_on_container_copy_assignment in btree ↵Gravatar Evan Brown2023-09-15
| | | | | | | move assignment. PiperOrigin-RevId: 565730754 Change-Id: Id828847d32c812736669803c179351433dda4aa6
* Move CountingAllocator into test_allocator.h and add some other allocators ↵Gravatar Evan Brown2023-09-15
| | | | | | | that can be shared between different container tests. PiperOrigin-RevId: 565693736 Change-Id: I59af987e30da03a805ce59ff0fb7eeae3fc08293
* Make PolicyTraits::transfer_uses_memcpy() true for node_hash_* tables.Gravatar Evan Brown2023-09-12
| | | | | | | This should enable binary size savings for now and more efficiency improvements with small buffer optimization. PiperOrigin-RevId: 564741270 Change-Id: Icf204d88256243eb60464439a52dd589d7a559cb
* Add a flat_hash_set_test that we use value_type member functions to ↵Gravatar Evan Brown2023-09-12
| | | | | | | | | read/write from value_types when we aren't allowed to memcpy them. The motivation is to prevent a bug in small buffer optimization for swisstables. PiperOrigin-RevId: 564726325 Change-Id: Id0df5d28d65c7586428001fcb266886988cd481e
* Fix an issue in which b-tree set iterators allow for mutable access to keys.Gravatar Evan Brown2023-09-06
| | | | | | | | | | | This change makes b-tree sets conform to the std::set API of having const access through `iterator`s as well as `const_iterator`s. This change can cause breakages for user code that depends on having mutable access to keys. If your code breaks, then there a couple of options to fix the issue: - If you are mutating a part of the key that can impact the sorted order, then this is a bug and you need to extract the key, mutate it, and then re-insert the mutated key. - If you are mutating a part of the key that can't impact the sorted order, then you can potentially (a) refactor to use btree_map instead of btree_set and make the part of the key that doesn't impact that ordering be the mapped_type, (b) change the part of the key that doesn't impact the ordering to be a `mutable` member of the key_type, (c) refactor from btree_set<K> to btree_set<K*> (but this also permits mutable access to the part of the key that determines the ordering). PiperOrigin-RevId: 563118156 Change-Id: I243558e74c43aa6655290099494b411d15298f4c
* Remove the unused LowerBoundAllocatedByteSize function.Gravatar Evan Brown2023-09-05
| | | | | PiperOrigin-RevId: 562832827 Change-Id: If37f83e67b3b2ea350f74dd6bffae51ea5508f12
* Add a comment about a more efficient implementation of btree range erase.Gravatar Evan Brown2023-09-01
| | | | | PiperOrigin-RevId: 561954737 Change-Id: I0e29a4f4523e4b3eafbd26d1d96f6e1c8deed957
* Optimize Resize and Iteration on ArmGravatar Connal de Souza2023-08-30
| | | | | | | | | | | | | There is a few cycles of overhead when transfering between GPR and Neon registers. We pay this cost for GroupAarch64Impl, largely because the speedup we get in Match() makes it profitable. After a Match call, if we do subsequent Group operations, we don't have to pay the full GPR <-> Neon cost, so it makes sense to do them with Neon instructions as well. However, in iteration and find_first_non_full(), we do not do a prior Match(), so the Mask/Count EmptyOrDeleted calls pay the full GPR <-> Neon cost. We can avoid this by using the GPR versions of the functions in the portable implementation of Group instead. We slightly change the order of operations in these functions (should be functionally a nop) in order to take advantage of Arm's free flexible second operand shifts with Logical operations. Iteration and Resize are roughly 8% and 12.6% faster respectively. This is not profitable on x86 because there is much lower GPR <-> xmm register latency and we use a 16-bit wide Group size. PiperOrigin-RevId: 561415183 Change-Id: I660b5bb84afedb05a12dcdf04d5b2e1514902760
* Make raw_hash_set::destroy_slots no longer public. It was never meant to be ↵Gravatar Evan Brown2023-08-29
| | | | | | | a public member of the API. PiperOrigin-RevId: 561061460 Change-Id: Ib804d3d3cf427ebfc9e622db9915287eb8045e26
* Remove the has_element function and use FindElement instead.Gravatar Evan Brown2023-08-17
| | | | | PiperOrigin-RevId: 557920808 Change-Id: I1eb0ca1ea9e9de542321fbc23d82218c5d449fbf
* Update an old comment that refers to obsolete types.Gravatar Evan Brown2023-08-15
| | | | | PiperOrigin-RevId: 557187112 Change-Id: I7c3e4be0ab5a7451173da7a0ded53a3d227bb093
* Add missing includes in raw_hash_set.h.Gravatar Evan Brown2023-08-11
| | | | | PiperOrigin-RevId: 556065631 Change-Id: I7e69b1495946c42fab185a1bc23e9564bfbd5e41
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