tvl-depot/absl/container/internal/raw_hash_set.h

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// Copyright 2018 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// An open-addressing
// hashtable with quadratic probing.
//
// This is a low level hashtable on top of which different interfaces can be
// implemented, like flat_hash_set, node_hash_set, string_hash_set, etc.
//
// The table interface is similar to that of std::unordered_set. Notable
// differences are that most member functions support heterogeneous keys when
// BOTH the hash and eq functions are marked as transparent. They do so by
// providing a typedef called `is_transparent`.
//
// When heterogeneous lookup is enabled, functions that take key_type act as if
// they have an overload set like:
//
// iterator find(const key_type& key);
// template <class K>
// iterator find(const K& key);
//
// size_type erase(const key_type& key);
// template <class K>
// size_type erase(const K& key);
//
// std::pair<iterator, iterator> equal_range(const key_type& key);
// template <class K>
// std::pair<iterator, iterator> equal_range(const K& key);
//
// When heterogeneous lookup is disabled, only the explicit `key_type` overloads
// exist.
//
// find() also supports passing the hash explicitly:
//
// iterator find(const key_type& key, size_t hash);
// template <class U>
// iterator find(const U& key, size_t hash);
//
// In addition the pointer to element and iterator stability guarantees are
// weaker: all iterators and pointers are invalidated after a new element is
// inserted.
//
// IMPLEMENTATION DETAILS
//
// The table stores elements inline in a slot array. In addition to the slot
// array the table maintains some control state per slot. The extra state is one
// byte per slot and stores empty or deleted marks, or alternatively 7 bits from
// the hash of an occupied slot. The table is split into logical groups of
// slots, like so:
//
// Group 1 Group 2 Group 3
// +---------------+---------------+---------------+
// | | | | | | | | | | | | | | | | | | | | | | | | |
// +---------------+---------------+---------------+
//
// On lookup the hash is split into two parts:
// - H2: 7 bits (those stored in the control bytes)
// - H1: the rest of the bits
// The groups are probed using H1. For each group the slots are matched to H2 in
// parallel. Because H2 is 7 bits (128 states) and the number of slots per group
// is low (8 or 16) in almost all cases a match in H2 is also a lookup hit.
//
// On insert, once the right group is found (as in lookup), its slots are
// filled in order.
//
// On erase a slot is cleared. In case the group did not have any empty slots
// before the erase, the erased slot is marked as deleted.
//
// Groups without empty slots (but maybe with deleted slots) extend the probe
// sequence. The probing algorithm is quadratic. Given N the number of groups,
// the probing function for the i'th probe is:
//
// P(0) = H1 % N
//
// P(i) = (P(i - 1) + i) % N
//
// This probing function guarantees that after N probes, all the groups of the
// table will be probed exactly once.
#ifndef ABSL_CONTAINER_INTERNAL_RAW_HASH_SET_H_
#define ABSL_CONTAINER_INTERNAL_RAW_HASH_SET_H_
#include <algorithm>
#include <cmath>
#include <cstdint>
#include <cstring>
#include <iterator>
#include <limits>
#include <memory>
#include <tuple>
#include <type_traits>
#include <utility>
#include "absl/base/internal/bits.h"
#include "absl/base/internal/endian.h"
#include "absl/base/port.h"
#include "absl/container/internal/common.h"
#include "absl/container/internal/compressed_tuple.h"
#include "absl/container/internal/container_memory.h"
#include "absl/container/internal/hash_policy_traits.h"
#include "absl/container/internal/hashtable_debug_hooks.h"
Export of internal Abseil changes. -- 7fa1107161a03dac53fb84c2b06d8092616c7b13 by Abseil Team <absl-team@google.com>: Harden the generic stacktrace implementation for use during early program execution PiperOrigin-RevId: 226375950 -- 079f9969329f5eb66f647dd3c44b17541b1bf217 by Matt Kulukundis <kfm@google.com>: Workaround platforms that have over-aggressive warnings on -Wexit-time-destructors PiperOrigin-RevId: 226362948 -- 1447943f509be681ca5495add0162c750ef237f1 by Matt Kulukundis <kfm@google.com>: Switch from 64 to size_t atomics so they work on embedded platforms that do not have 64 bit atomics. PiperOrigin-RevId: 226210704 -- d14d49837ae2bcde74051e0c79c18ee0f43866b9 by Tom Manshreck <shreck@google.com>: Develop initial documentation for API breaking changes process: PiperOrigin-RevId: 226210021 -- 7ea3d7fe0e86979dab83a5fc9cc3bf1d6cb3bd53 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 226195522 -- 7de873e880d7f016a4fa1e08d626f0535cc470af by Abseil Team <absl-team@google.com>: Make Abseil LICENSE files newline terminated, with a single trailing blank line. Also remove line-ending whitespace. PiperOrigin-RevId: 226182949 -- 7d00643fadfad7f0d992c68bd9d2ed2e5bc960b0 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226045282 -- c4a0a11c0ce2875271191e477f3d36eaaeca4613 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226038273 -- 8ee4ebbb1ae5cda119e436e5ff7e3aa966608c10 by Matt Kulukundis <kfm@google.com>: Adds a global sampler which tracks a fraction of live tables for collecting telemetry data. PiperOrigin-RevId: 226032080 -- d576446f050518cd1b0ae447d682d8552f0e7e30 by Mark Barolak <mbar@google.com>: Replace an internal CaseEqual function with calls to the identical absl::EqualsIgnoreCase. This closes out a rather old TODO. PiperOrigin-RevId: 226024779 -- 6b23f1ee028a5ffa608c920424f1220a117a8f3d by Abseil Team <absl-team@google.com>: Add December 2018 LTS branch to list of LTS branches. PiperOrigin-RevId: 226011333 -- bb0833a43bdaef4c8c059b17bcd27ba9a085a114 by Mark Barolak <mbar@google.com>: Explicitly state that when the SimpleAtoi family of functions encounter an error, the value of their output parameter is unspecified. Also standardize the name of the output parameter to be `out`. PiperOrigin-RevId: 225997035 -- 46c1876b1a248eabda7545daa61a74a4cdfe9077 by Abseil Team <absl-team@google.com>: Remove deprecated CMake function absl_test, absl_library and absl_header_library PiperOrigin-RevId: 225950041 GitOrigin-RevId: 7fa1107161a03dac53fb84c2b06d8092616c7b13 Change-Id: I2ca9d3aada9292614527d1339a7557494139b806
2018-12-20 21:29:59 +01:00
#include "absl/container/internal/hashtablez_sampler.h"
#include "absl/container/internal/have_sse.h"
#include "absl/container/internal/layout.h"
#include "absl/memory/memory.h"
#include "absl/meta/type_traits.h"
#include "absl/utility/utility.h"
namespace absl {
namespace container_internal {
template <size_t Width>
class probe_seq {
public:
probe_seq(size_t hash, size_t mask) {
assert(((mask + 1) & mask) == 0 && "not a mask");
mask_ = mask;
offset_ = hash & mask_;
}
size_t offset() const { return offset_; }
size_t offset(size_t i) const { return (offset_ + i) & mask_; }
void next() {
index_ += Width;
offset_ += index_;
offset_ &= mask_;
}
// 0-based probe index. The i-th probe in the probe sequence.
size_t index() const { return index_; }
private:
size_t mask_;
size_t offset_;
size_t index_ = 0;
};
template <class ContainerKey, class Hash, class Eq>
struct RequireUsableKey {
template <class PassedKey, class... Args>
std::pair<
decltype(std::declval<const Hash&>()(std::declval<const PassedKey&>())),
decltype(std::declval<const Eq&>()(std::declval<const ContainerKey&>(),
std::declval<const PassedKey&>()))>*
operator()(const PassedKey&, const Args&...) const;
};
template <class E, class Policy, class Hash, class Eq, class... Ts>
struct IsDecomposable : std::false_type {};
template <class Policy, class Hash, class Eq, class... Ts>
struct IsDecomposable<
absl::void_t<decltype(
Policy::apply(RequireUsableKey<typename Policy::key_type, Hash, Eq>(),
std::declval<Ts>()...))>,
Policy, Hash, Eq, Ts...> : std::true_type {};
// TODO(alkis): Switch to std::is_nothrow_swappable when gcc/clang supports it.
template <class T>
constexpr bool IsNoThrowSwappable() {
using std::swap;
return noexcept(swap(std::declval<T&>(), std::declval<T&>()));
}
template <typename T>
int TrailingZeros(T x) {
Export of internal Abseil changes. -- 178e7a9a76fc8fcd6df6335b59139cbe644a16b9 by Jon Cohen <cohenjon@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 220523164 -- 59ef14fe7034a3148f1e9cef1f128b8ca264b444 by Jon Cohen <cohenjon@google.com>: Don't assume how much std::vector's constructors allocate in InlinedVector's test for scoped_allocator_adaptor support. PiperOrigin-RevId: 220464683 -- 6f8351be43a44a8f10bf20612b2cc744a4a911c7 by Jon Cohen <cohenjon@google.com>: Add VS Code and some Bazel output files to absl/.gitignore PiperOrigin-RevId: 220464362 -- 43fac22f8af6b6ed55309a784a9d25d837393d0e by Abseil Team <absl-team@google.com>: absl: fix SpinLock::EncodeWaitCycles If a thread has ever observed or set kSpinLockSleeper, it must never leave 0 in kWaitTimeMask because at this point it is expected to wake subsequent threads. Current calculations in EncodeWaitCycles can result in 0 in kWaitTimeMask and lead to missed wakeups. This is mostly theoretical today, because the futex call needs to finish within 128 cycles (futex can return immediately without waiting, but 128 cycles still look too low for this). But this can well fire in future if we bump granularity and/or threshold for recording contention. Use kSpinLockSleeper instead of 0. PiperOrigin-RevId: 220463123 -- def9b7e3d45c99d68cc52a4429256116d7f421f2 by Abseil Team <absl-team@google.com>: absl: optimize SpinLock::SlowLock Currently we record contention even after the first initial spin. This leads to several performance issues: 1. If we succeed in acquiring the lock after the initial spin, overall wait time can be within tens/hundreds of nanoseconds. Recording such low wait time looks completely unnecessary and excessive. From some point of view this is not even a wait, because we did not sleep. And, for example, Mutex does not record contention in this case. In majority of cases the lock should be acquired exactly during the initial spin, yet we still go through full overhead of submitting contention. 2. Whenever a thread submits contention it also calls FUTEX_WAKE (there is no way to understand if it's necessary or not when wait value is stored in the lock). So if there are just 2 threads and a brief contention, the second thread will still call FUTEX_WAKE which is completely unnecessary overhead. Don't record contention after the initial spin wait. FWIW this also removes 2 CycleClock::Now calls and EncodeWaitCycles from the common hot path. PiperOrigin-RevId: 220379972 -- 75b0c0cb214de904ea622f81ec3f4eabdc8695b0 by Derek Mauro <dmauro@google.com>: Supress MSVC warnings in raw_hash_set's use of TrailingZeros and LeadingZeros. https://github.com/abseil/abseil-cpp/issues/208 PiperOrigin-RevId: 220372204 GitOrigin-RevId: 178e7a9a76fc8fcd6df6335b59139cbe644a16b9 Change-Id: I3a66af4e050810a3274e45d4e055b2aa19ffba1b
2018-11-07 22:52:16 +01:00
return sizeof(T) == 8 ? base_internal::CountTrailingZerosNonZero64(
static_cast<uint64_t>(x))
: base_internal::CountTrailingZerosNonZero32(
static_cast<uint32_t>(x));
}
template <typename T>
int LeadingZeros(T x) {
Export of internal Abseil changes. -- 178e7a9a76fc8fcd6df6335b59139cbe644a16b9 by Jon Cohen <cohenjon@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 220523164 -- 59ef14fe7034a3148f1e9cef1f128b8ca264b444 by Jon Cohen <cohenjon@google.com>: Don't assume how much std::vector's constructors allocate in InlinedVector's test for scoped_allocator_adaptor support. PiperOrigin-RevId: 220464683 -- 6f8351be43a44a8f10bf20612b2cc744a4a911c7 by Jon Cohen <cohenjon@google.com>: Add VS Code and some Bazel output files to absl/.gitignore PiperOrigin-RevId: 220464362 -- 43fac22f8af6b6ed55309a784a9d25d837393d0e by Abseil Team <absl-team@google.com>: absl: fix SpinLock::EncodeWaitCycles If a thread has ever observed or set kSpinLockSleeper, it must never leave 0 in kWaitTimeMask because at this point it is expected to wake subsequent threads. Current calculations in EncodeWaitCycles can result in 0 in kWaitTimeMask and lead to missed wakeups. This is mostly theoretical today, because the futex call needs to finish within 128 cycles (futex can return immediately without waiting, but 128 cycles still look too low for this). But this can well fire in future if we bump granularity and/or threshold for recording contention. Use kSpinLockSleeper instead of 0. PiperOrigin-RevId: 220463123 -- def9b7e3d45c99d68cc52a4429256116d7f421f2 by Abseil Team <absl-team@google.com>: absl: optimize SpinLock::SlowLock Currently we record contention even after the first initial spin. This leads to several performance issues: 1. If we succeed in acquiring the lock after the initial spin, overall wait time can be within tens/hundreds of nanoseconds. Recording such low wait time looks completely unnecessary and excessive. From some point of view this is not even a wait, because we did not sleep. And, for example, Mutex does not record contention in this case. In majority of cases the lock should be acquired exactly during the initial spin, yet we still go through full overhead of submitting contention. 2. Whenever a thread submits contention it also calls FUTEX_WAKE (there is no way to understand if it's necessary or not when wait value is stored in the lock). So if there are just 2 threads and a brief contention, the second thread will still call FUTEX_WAKE which is completely unnecessary overhead. Don't record contention after the initial spin wait. FWIW this also removes 2 CycleClock::Now calls and EncodeWaitCycles from the common hot path. PiperOrigin-RevId: 220379972 -- 75b0c0cb214de904ea622f81ec3f4eabdc8695b0 by Derek Mauro <dmauro@google.com>: Supress MSVC warnings in raw_hash_set's use of TrailingZeros and LeadingZeros. https://github.com/abseil/abseil-cpp/issues/208 PiperOrigin-RevId: 220372204 GitOrigin-RevId: 178e7a9a76fc8fcd6df6335b59139cbe644a16b9 Change-Id: I3a66af4e050810a3274e45d4e055b2aa19ffba1b
2018-11-07 22:52:16 +01:00
return sizeof(T) == 8
? base_internal::CountLeadingZeros64(static_cast<uint64_t>(x))
: base_internal::CountLeadingZeros32(static_cast<uint32_t>(x));
}
// An abstraction over a bitmask. It provides an easy way to iterate through the
// indexes of the set bits of a bitmask. When Shift=0 (platforms with SSE),
// this is a true bitmask. On non-SSE, platforms the arithematic used to
// emulate the SSE behavior works in bytes (Shift=3) and leaves each bytes as
// either 0x00 or 0x80.
//
// For example:
// for (int i : BitMask<uint32_t, 16>(0x5)) -> yields 0, 2
// for (int i : BitMask<uint64_t, 8, 3>(0x0000000080800000)) -> yields 2, 3
template <class T, int SignificantBits, int Shift = 0>
class BitMask {
static_assert(std::is_unsigned<T>::value, "");
static_assert(Shift == 0 || Shift == 3, "");
public:
// These are useful for unit tests (gunit).
using value_type = int;
using iterator = BitMask;
using const_iterator = BitMask;
explicit BitMask(T mask) : mask_(mask) {}
BitMask& operator++() {
mask_ &= (mask_ - 1);
return *this;
}
explicit operator bool() const { return mask_ != 0; }
int operator*() const { return LowestBitSet(); }
int LowestBitSet() const {
return container_internal::TrailingZeros(mask_) >> Shift;
}
int HighestBitSet() const {
return (sizeof(T) * CHAR_BIT - container_internal::LeadingZeros(mask_) -
1) >>
Shift;
}
BitMask begin() const { return *this; }
BitMask end() const { return BitMask(0); }
int TrailingZeros() const {
return container_internal::TrailingZeros(mask_) >> Shift;
}
int LeadingZeros() const {
constexpr int total_significant_bits = SignificantBits << Shift;
constexpr int extra_bits = sizeof(T) * 8 - total_significant_bits;
return container_internal::LeadingZeros(mask_ << extra_bits) >> Shift;
}
private:
friend bool operator==(const BitMask& a, const BitMask& b) {
return a.mask_ == b.mask_;
}
friend bool operator!=(const BitMask& a, const BitMask& b) {
return a.mask_ != b.mask_;
}
T mask_;
};
using ctrl_t = signed char;
using h2_t = uint8_t;
// The values here are selected for maximum performance. See the static asserts
// below for details.
enum Ctrl : ctrl_t {
kEmpty = -128, // 0b10000000
kDeleted = -2, // 0b11111110
kSentinel = -1, // 0b11111111
};
static_assert(
kEmpty & kDeleted & kSentinel & 0x80,
"Special markers need to have the MSB to make checking for them efficient");
static_assert(kEmpty < kSentinel && kDeleted < kSentinel,
"kEmpty and kDeleted must be smaller than kSentinel to make the "
"SIMD test of IsEmptyOrDeleted() efficient");
static_assert(kSentinel == -1,
"kSentinel must be -1 to elide loading it from memory into SIMD "
"registers (pcmpeqd xmm, xmm)");
static_assert(kEmpty == -128,
"kEmpty must be -128 to make the SIMD check for its "
"existence efficient (psignb xmm, xmm)");
static_assert(~kEmpty & ~kDeleted & kSentinel & 0x7F,
"kEmpty and kDeleted must share an unset bit that is not shared "
"by kSentinel to make the scalar test for MatchEmptyOrDeleted() "
"efficient");
static_assert(kDeleted == -2,
"kDeleted must be -2 to make the implementation of "
"ConvertSpecialToEmptyAndFullToDeleted efficient");
// A single block of empty control bytes for tables without any slots allocated.
// This enables removing a branch in the hot path of find().
inline ctrl_t* EmptyGroup() {
alignas(16) static constexpr ctrl_t empty_group[] = {
kSentinel, kEmpty, kEmpty, kEmpty, kEmpty, kEmpty, kEmpty, kEmpty,
kEmpty, kEmpty, kEmpty, kEmpty, kEmpty, kEmpty, kEmpty, kEmpty};
return const_cast<ctrl_t*>(empty_group);
}
// Mixes a randomly generated per-process seed with `hash` and `ctrl` to
// randomize insertion order within groups.
bool ShouldInsertBackwards(size_t hash, ctrl_t* ctrl);
// Returns a hash seed.
//
// The seed consists of the ctrl_ pointer, which adds enough entropy to ensure
// non-determinism of iteration order in most cases.
inline size_t HashSeed(const ctrl_t* ctrl) {
// The low bits of the pointer have little or no entropy because of
// alignment. We shift the pointer to try to use higher entropy bits. A
// good number seems to be 12 bits, because that aligns with page size.
return reinterpret_cast<uintptr_t>(ctrl) >> 12;
}
inline size_t H1(size_t hash, const ctrl_t* ctrl) {
return (hash >> 7) ^ HashSeed(ctrl);
}
inline ctrl_t H2(size_t hash) { return hash & 0x7F; }
inline bool IsEmpty(ctrl_t c) { return c == kEmpty; }
inline bool IsFull(ctrl_t c) { return c >= 0; }
inline bool IsDeleted(ctrl_t c) { return c == kDeleted; }
inline bool IsEmptyOrDeleted(ctrl_t c) { return c < kSentinel; }
#if SWISSTABLE_HAVE_SSE2
Export of internal Abseil changes. -- ee19e203eca970ff88e8f25ce4e19c32e143b988 by Jon Cohen <cohenjon@google.com>: Exception safety testing no longer uses absl::optional PiperOrigin-RevId: 220336204 -- 460666eb0b316a8b4aeedc589644d53b05251bd1 by Derek Mauro <dmauro@google.com>: Rework SwissTable SSE2 support - Use SSE2 on MSVC when available https://github.com/abseil/abseil-cpp/issues/210 - Emulate _mm_cmpgt_epi8 with other SSE2 instructions when using -funsigned-char under GCC https://github.com/abseil/abseil-cpp/issues/209 PiperOrigin-RevId: 220312351 -- 1f4318ecedf8d539b7b698eb803d613ad6b69278 by Abseil Team <absl-team@google.com>: Change CollectPerfectRatios to use 10 trials to smooth out the outliers in the sample. PiperOrigin-RevId: 220286579 -- 6755abc2673553a7f578bb29c6e9ca8d991bc9c8 by Abseil Team <absl-team@google.com>: Internal change PiperOrigin-RevId: 220274307 -- 8645b6187329ebf0aaf3c2de2888ba44466cd879 by Abseil Team <absl-team@google.com>: * #endif for a header guard should reference the guard macro in a comment PiperOrigin-RevId: 220206868 -- 3987a7ad11319230910931cd2468b60b3fd1b85c by Gennadiy Civil <misterg@google.com>: Internal Change PiperOrigin-RevId: 220136674 -- cc908c1db2ee0d4523dc813e33f600583bb986c5 by Abseil Team <absl-team@google.com>: absl: fix backoff logic in SpinLockWait There are 3 bugs in loop variable handling: 1. It starts with 0, but AbslInternalSpinLockDelay ignores loop == 0. So it does not actually wait when it should. 2. loop is incremented after successful state changes, but it should not (why would be increase backoff delay after that?). 3. loop is incremented after CAS failures, but it should not (why would be increase backoff delay after that?). Use the same handling of loop as used in SpinLock. PiperOrigin-RevId: 220136079 -- a0a1c6ef5910ebd28e07215d7df03cc0da0b3eed by Abseil Team <absl-team@google.com>: absl: relax unnecessarily strong memory ordering in SpinLock::SlowLock We don't need to acquire visibility over anything when setting kSpinLockSleeper. Replace the confusing and unnecessarily strong memory order with relaxed. PiperOrigin-RevId: 220023380 -- c50858b51af28b9fca1a62616324f85f3e84ea74 by Tom Manshreck <shreck@google.com>: Update comments in flat_hash_map, node_hash_{set, map} and the containers developer guide PiperOrigin-RevId: 219938692 -- e87b7d1a5f61e165b1c44d3b16d8d967197cdfce by CJ Johnson <johnsoncj@google.com>: Rearranges the public methods of InlinedVector and cleans up the comments PiperOrigin-RevId: 219896257 -- f3234c466f792e0fc4bfd21fc7919dba5e679375 by CJ Johnson <johnsoncj@google.com>: Adds branch prediction to exceptional early exit cases of inlined vector's API PiperOrigin-RevId: 219887173 -- 4dfccf1a81ca0425912d3da25a8470f78c532ce4 by CJ Johnson <johnsoncj@google.com>: Fixes the InlinedVector public interface to use the allocator type references instead of assuming the type Also cleans up some cruft in formatting and comments PiperOrigin-RevId: 219878876 -- 4bb6a2b892abb10bd6a424db7e94ed8640802470 by Tom Manshreck <shreck@google.com>: Add comments on constructor and assignment operator support to flat_hash_set PiperOrigin-RevId: 219825338 -- c23f973e2f7f4feea0da36bf8a9c3f8a8954bb74 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 219823847 GitOrigin-RevId: ee19e203eca970ff88e8f25ce4e19c32e143b988 Change-Id: I288c927ca481dc57340420dbb4c278a05cf15e83
2018-11-06 22:01:25 +01:00
// https://github.com/abseil/abseil-cpp/issues/209
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87853
// _mm_cmpgt_epi8 is broken under GCC with -funsigned-char
// Work around this by using the portable implementation of Group
// when using -funsigned-char under GCC.
inline __m128i _mm_cmpgt_epi8_fixed(__m128i a, __m128i b) {
#if defined(__GNUC__) && !defined(__clang__)
if (std::is_unsigned<char>::value) {
const __m128i mask = _mm_set1_epi8(0x80);
const __m128i diff = _mm_subs_epi8(b, a);
return _mm_cmpeq_epi8(_mm_and_si128(diff, mask), mask);
}
#endif
return _mm_cmpgt_epi8(a, b);
}
struct GroupSse2Impl {
static constexpr size_t kWidth = 16; // the number of slots per group
explicit GroupSse2Impl(const ctrl_t* pos) {
ctrl = _mm_loadu_si128(reinterpret_cast<const __m128i*>(pos));
}
// Returns a bitmask representing the positions of slots that match hash.
BitMask<uint32_t, kWidth> Match(h2_t hash) const {
auto match = _mm_set1_epi8(hash);
return BitMask<uint32_t, kWidth>(
_mm_movemask_epi8(_mm_cmpeq_epi8(match, ctrl)));
}
// Returns a bitmask representing the positions of empty slots.
BitMask<uint32_t, kWidth> MatchEmpty() const {
#if SWISSTABLE_HAVE_SSSE3
// This only works because kEmpty is -128.
return BitMask<uint32_t, kWidth>(
_mm_movemask_epi8(_mm_sign_epi8(ctrl, ctrl)));
#else
return Match(kEmpty);
#endif
}
// Returns a bitmask representing the positions of empty or deleted slots.
BitMask<uint32_t, kWidth> MatchEmptyOrDeleted() const {
auto special = _mm_set1_epi8(kSentinel);
return BitMask<uint32_t, kWidth>(
Export of internal Abseil changes. -- ee19e203eca970ff88e8f25ce4e19c32e143b988 by Jon Cohen <cohenjon@google.com>: Exception safety testing no longer uses absl::optional PiperOrigin-RevId: 220336204 -- 460666eb0b316a8b4aeedc589644d53b05251bd1 by Derek Mauro <dmauro@google.com>: Rework SwissTable SSE2 support - Use SSE2 on MSVC when available https://github.com/abseil/abseil-cpp/issues/210 - Emulate _mm_cmpgt_epi8 with other SSE2 instructions when using -funsigned-char under GCC https://github.com/abseil/abseil-cpp/issues/209 PiperOrigin-RevId: 220312351 -- 1f4318ecedf8d539b7b698eb803d613ad6b69278 by Abseil Team <absl-team@google.com>: Change CollectPerfectRatios to use 10 trials to smooth out the outliers in the sample. PiperOrigin-RevId: 220286579 -- 6755abc2673553a7f578bb29c6e9ca8d991bc9c8 by Abseil Team <absl-team@google.com>: Internal change PiperOrigin-RevId: 220274307 -- 8645b6187329ebf0aaf3c2de2888ba44466cd879 by Abseil Team <absl-team@google.com>: * #endif for a header guard should reference the guard macro in a comment PiperOrigin-RevId: 220206868 -- 3987a7ad11319230910931cd2468b60b3fd1b85c by Gennadiy Civil <misterg@google.com>: Internal Change PiperOrigin-RevId: 220136674 -- cc908c1db2ee0d4523dc813e33f600583bb986c5 by Abseil Team <absl-team@google.com>: absl: fix backoff logic in SpinLockWait There are 3 bugs in loop variable handling: 1. It starts with 0, but AbslInternalSpinLockDelay ignores loop == 0. So it does not actually wait when it should. 2. loop is incremented after successful state changes, but it should not (why would be increase backoff delay after that?). 3. loop is incremented after CAS failures, but it should not (why would be increase backoff delay after that?). Use the same handling of loop as used in SpinLock. PiperOrigin-RevId: 220136079 -- a0a1c6ef5910ebd28e07215d7df03cc0da0b3eed by Abseil Team <absl-team@google.com>: absl: relax unnecessarily strong memory ordering in SpinLock::SlowLock We don't need to acquire visibility over anything when setting kSpinLockSleeper. Replace the confusing and unnecessarily strong memory order with relaxed. PiperOrigin-RevId: 220023380 -- c50858b51af28b9fca1a62616324f85f3e84ea74 by Tom Manshreck <shreck@google.com>: Update comments in flat_hash_map, node_hash_{set, map} and the containers developer guide PiperOrigin-RevId: 219938692 -- e87b7d1a5f61e165b1c44d3b16d8d967197cdfce by CJ Johnson <johnsoncj@google.com>: Rearranges the public methods of InlinedVector and cleans up the comments PiperOrigin-RevId: 219896257 -- f3234c466f792e0fc4bfd21fc7919dba5e679375 by CJ Johnson <johnsoncj@google.com>: Adds branch prediction to exceptional early exit cases of inlined vector's API PiperOrigin-RevId: 219887173 -- 4dfccf1a81ca0425912d3da25a8470f78c532ce4 by CJ Johnson <johnsoncj@google.com>: Fixes the InlinedVector public interface to use the allocator type references instead of assuming the type Also cleans up some cruft in formatting and comments PiperOrigin-RevId: 219878876 -- 4bb6a2b892abb10bd6a424db7e94ed8640802470 by Tom Manshreck <shreck@google.com>: Add comments on constructor and assignment operator support to flat_hash_set PiperOrigin-RevId: 219825338 -- c23f973e2f7f4feea0da36bf8a9c3f8a8954bb74 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 219823847 GitOrigin-RevId: ee19e203eca970ff88e8f25ce4e19c32e143b988 Change-Id: I288c927ca481dc57340420dbb4c278a05cf15e83
2018-11-06 22:01:25 +01:00
_mm_movemask_epi8(_mm_cmpgt_epi8_fixed(special, ctrl)));
}
// Returns the number of trailing empty or deleted elements in the group.
uint32_t CountLeadingEmptyOrDeleted() const {
auto special = _mm_set1_epi8(kSentinel);
Export of internal Abseil changes. -- ee19e203eca970ff88e8f25ce4e19c32e143b988 by Jon Cohen <cohenjon@google.com>: Exception safety testing no longer uses absl::optional PiperOrigin-RevId: 220336204 -- 460666eb0b316a8b4aeedc589644d53b05251bd1 by Derek Mauro <dmauro@google.com>: Rework SwissTable SSE2 support - Use SSE2 on MSVC when available https://github.com/abseil/abseil-cpp/issues/210 - Emulate _mm_cmpgt_epi8 with other SSE2 instructions when using -funsigned-char under GCC https://github.com/abseil/abseil-cpp/issues/209 PiperOrigin-RevId: 220312351 -- 1f4318ecedf8d539b7b698eb803d613ad6b69278 by Abseil Team <absl-team@google.com>: Change CollectPerfectRatios to use 10 trials to smooth out the outliers in the sample. PiperOrigin-RevId: 220286579 -- 6755abc2673553a7f578bb29c6e9ca8d991bc9c8 by Abseil Team <absl-team@google.com>: Internal change PiperOrigin-RevId: 220274307 -- 8645b6187329ebf0aaf3c2de2888ba44466cd879 by Abseil Team <absl-team@google.com>: * #endif for a header guard should reference the guard macro in a comment PiperOrigin-RevId: 220206868 -- 3987a7ad11319230910931cd2468b60b3fd1b85c by Gennadiy Civil <misterg@google.com>: Internal Change PiperOrigin-RevId: 220136674 -- cc908c1db2ee0d4523dc813e33f600583bb986c5 by Abseil Team <absl-team@google.com>: absl: fix backoff logic in SpinLockWait There are 3 bugs in loop variable handling: 1. It starts with 0, but AbslInternalSpinLockDelay ignores loop == 0. So it does not actually wait when it should. 2. loop is incremented after successful state changes, but it should not (why would be increase backoff delay after that?). 3. loop is incremented after CAS failures, but it should not (why would be increase backoff delay after that?). Use the same handling of loop as used in SpinLock. PiperOrigin-RevId: 220136079 -- a0a1c6ef5910ebd28e07215d7df03cc0da0b3eed by Abseil Team <absl-team@google.com>: absl: relax unnecessarily strong memory ordering in SpinLock::SlowLock We don't need to acquire visibility over anything when setting kSpinLockSleeper. Replace the confusing and unnecessarily strong memory order with relaxed. PiperOrigin-RevId: 220023380 -- c50858b51af28b9fca1a62616324f85f3e84ea74 by Tom Manshreck <shreck@google.com>: Update comments in flat_hash_map, node_hash_{set, map} and the containers developer guide PiperOrigin-RevId: 219938692 -- e87b7d1a5f61e165b1c44d3b16d8d967197cdfce by CJ Johnson <johnsoncj@google.com>: Rearranges the public methods of InlinedVector and cleans up the comments PiperOrigin-RevId: 219896257 -- f3234c466f792e0fc4bfd21fc7919dba5e679375 by CJ Johnson <johnsoncj@google.com>: Adds branch prediction to exceptional early exit cases of inlined vector's API PiperOrigin-RevId: 219887173 -- 4dfccf1a81ca0425912d3da25a8470f78c532ce4 by CJ Johnson <johnsoncj@google.com>: Fixes the InlinedVector public interface to use the allocator type references instead of assuming the type Also cleans up some cruft in formatting and comments PiperOrigin-RevId: 219878876 -- 4bb6a2b892abb10bd6a424db7e94ed8640802470 by Tom Manshreck <shreck@google.com>: Add comments on constructor and assignment operator support to flat_hash_set PiperOrigin-RevId: 219825338 -- c23f973e2f7f4feea0da36bf8a9c3f8a8954bb74 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 219823847 GitOrigin-RevId: ee19e203eca970ff88e8f25ce4e19c32e143b988 Change-Id: I288c927ca481dc57340420dbb4c278a05cf15e83
2018-11-06 22:01:25 +01:00
return TrailingZeros(
_mm_movemask_epi8(_mm_cmpgt_epi8_fixed(special, ctrl)) + 1);
}
void ConvertSpecialToEmptyAndFullToDeleted(ctrl_t* dst) const {
Export of internal Abseil changes. -- 5f1ab09522226336830d9ea6ef7276d37f536ac5 by Abseil Team <absl-team@google.com>: Clarify the documentation of ABSL_MUST_USE_RESULT. PiperOrigin-RevId: 221663609 -- af4c8359a20d56369fd1dce318220cf3be03ca66 by Greg Falcon <gfalcon@google.com>: Internal change PiperOrigin-RevId: 221538448 -- 487cd09bd1942bf607080deeae38fee6ce66f294 by Eric Fiselier <ericwf@google.com>: Work around emscripten bugs and missing features in absl/time:time_test. The emscripten toolchain has a couple of issues that cause time_test to fail. Specifically: 1) emscripten doesn't support signals. 2) The javascript implementation of strftime/strptime use different expansions of '%c' that mean it doesn't round-trip. PiperOrigin-RevId: 221523701 -- 5823652e6a200b97b07334bc47128dfac40e20fc by Xiaoyi Zhang <zhangxy@google.com>: Fix MSVC compiler warning by explicitly casting to char. Currently our MSVC build breaks with the following error: raw_hash_set.h(406): warning C4309: 'argument': truncation of constant value PiperOrigin-RevId: 221492585 -- c5806358320711a5efbe5c523df13e14ab53a17d by Greg Falcon <gfalcon@google.com>: Replace calls to getpagesize() with the more portable sysconf(_SC_PAGESIZE); the latter is in POSIX 1.0 and is called out in the Linux `getpagesize` man page as a more portable spelling. PiperOrigin-RevId: 221492471 -- 19ffe82851072229bb7ce73f754ffe4c18e8c575 by Abseil Team <absl-team@google.com>: Fix -Wundef error in absl/hash/internal/hash.h. PiperOrigin-RevId: 221444120 -- b30f3d0a848563b6e4ec33f3dc085831dfabb748 by Jon Cohen <cohenjon@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 221339736 GitOrigin-RevId: 5f1ab09522226336830d9ea6ef7276d37f536ac5 Change-Id: I96223d522d98bf6616dea88eb047c2d536eeddd0
2018-11-15 20:55:00 +01:00
auto msbs = _mm_set1_epi8(static_cast<char>(-128));
auto x126 = _mm_set1_epi8(126);
#if SWISSTABLE_HAVE_SSSE3
auto res = _mm_or_si128(_mm_shuffle_epi8(x126, ctrl), msbs);
#else
auto zero = _mm_setzero_si128();
Export of internal Abseil changes. -- ee19e203eca970ff88e8f25ce4e19c32e143b988 by Jon Cohen <cohenjon@google.com>: Exception safety testing no longer uses absl::optional PiperOrigin-RevId: 220336204 -- 460666eb0b316a8b4aeedc589644d53b05251bd1 by Derek Mauro <dmauro@google.com>: Rework SwissTable SSE2 support - Use SSE2 on MSVC when available https://github.com/abseil/abseil-cpp/issues/210 - Emulate _mm_cmpgt_epi8 with other SSE2 instructions when using -funsigned-char under GCC https://github.com/abseil/abseil-cpp/issues/209 PiperOrigin-RevId: 220312351 -- 1f4318ecedf8d539b7b698eb803d613ad6b69278 by Abseil Team <absl-team@google.com>: Change CollectPerfectRatios to use 10 trials to smooth out the outliers in the sample. PiperOrigin-RevId: 220286579 -- 6755abc2673553a7f578bb29c6e9ca8d991bc9c8 by Abseil Team <absl-team@google.com>: Internal change PiperOrigin-RevId: 220274307 -- 8645b6187329ebf0aaf3c2de2888ba44466cd879 by Abseil Team <absl-team@google.com>: * #endif for a header guard should reference the guard macro in a comment PiperOrigin-RevId: 220206868 -- 3987a7ad11319230910931cd2468b60b3fd1b85c by Gennadiy Civil <misterg@google.com>: Internal Change PiperOrigin-RevId: 220136674 -- cc908c1db2ee0d4523dc813e33f600583bb986c5 by Abseil Team <absl-team@google.com>: absl: fix backoff logic in SpinLockWait There are 3 bugs in loop variable handling: 1. It starts with 0, but AbslInternalSpinLockDelay ignores loop == 0. So it does not actually wait when it should. 2. loop is incremented after successful state changes, but it should not (why would be increase backoff delay after that?). 3. loop is incremented after CAS failures, but it should not (why would be increase backoff delay after that?). Use the same handling of loop as used in SpinLock. PiperOrigin-RevId: 220136079 -- a0a1c6ef5910ebd28e07215d7df03cc0da0b3eed by Abseil Team <absl-team@google.com>: absl: relax unnecessarily strong memory ordering in SpinLock::SlowLock We don't need to acquire visibility over anything when setting kSpinLockSleeper. Replace the confusing and unnecessarily strong memory order with relaxed. PiperOrigin-RevId: 220023380 -- c50858b51af28b9fca1a62616324f85f3e84ea74 by Tom Manshreck <shreck@google.com>: Update comments in flat_hash_map, node_hash_{set, map} and the containers developer guide PiperOrigin-RevId: 219938692 -- e87b7d1a5f61e165b1c44d3b16d8d967197cdfce by CJ Johnson <johnsoncj@google.com>: Rearranges the public methods of InlinedVector and cleans up the comments PiperOrigin-RevId: 219896257 -- f3234c466f792e0fc4bfd21fc7919dba5e679375 by CJ Johnson <johnsoncj@google.com>: Adds branch prediction to exceptional early exit cases of inlined vector's API PiperOrigin-RevId: 219887173 -- 4dfccf1a81ca0425912d3da25a8470f78c532ce4 by CJ Johnson <johnsoncj@google.com>: Fixes the InlinedVector public interface to use the allocator type references instead of assuming the type Also cleans up some cruft in formatting and comments PiperOrigin-RevId: 219878876 -- 4bb6a2b892abb10bd6a424db7e94ed8640802470 by Tom Manshreck <shreck@google.com>: Add comments on constructor and assignment operator support to flat_hash_set PiperOrigin-RevId: 219825338 -- c23f973e2f7f4feea0da36bf8a9c3f8a8954bb74 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 219823847 GitOrigin-RevId: ee19e203eca970ff88e8f25ce4e19c32e143b988 Change-Id: I288c927ca481dc57340420dbb4c278a05cf15e83
2018-11-06 22:01:25 +01:00
auto special_mask = _mm_cmpgt_epi8_fixed(zero, ctrl);
auto res = _mm_or_si128(msbs, _mm_andnot_si128(special_mask, x126));
#endif
_mm_storeu_si128(reinterpret_cast<__m128i*>(dst), res);
}
__m128i ctrl;
};
#endif // SWISSTABLE_HAVE_SSE2
struct GroupPortableImpl {
static constexpr size_t kWidth = 8;
explicit GroupPortableImpl(const ctrl_t* pos)
: ctrl(little_endian::Load64(pos)) {}
BitMask<uint64_t, kWidth, 3> Match(h2_t hash) const {
// For the technique, see:
// http://graphics.stanford.edu/~seander/bithacks.html##ValueInWord
// (Determine if a word has a byte equal to n).
//
// Caveat: there are false positives but:
// - they only occur if there is a real match
// - they never occur on kEmpty, kDeleted, kSentinel
// - they will be handled gracefully by subsequent checks in code
//
// Example:
// v = 0x1716151413121110
// hash = 0x12
// retval = (v - lsbs) & ~v & msbs = 0x0000000080800000
constexpr uint64_t msbs = 0x8080808080808080ULL;
constexpr uint64_t lsbs = 0x0101010101010101ULL;
auto x = ctrl ^ (lsbs * hash);
return BitMask<uint64_t, kWidth, 3>((x - lsbs) & ~x & msbs);
}
BitMask<uint64_t, kWidth, 3> MatchEmpty() const {
constexpr uint64_t msbs = 0x8080808080808080ULL;
return BitMask<uint64_t, kWidth, 3>((ctrl & (~ctrl << 6)) & msbs);
}
BitMask<uint64_t, kWidth, 3> MatchEmptyOrDeleted() const {
constexpr uint64_t msbs = 0x8080808080808080ULL;
return BitMask<uint64_t, kWidth, 3>((ctrl & (~ctrl << 7)) & msbs);
}
uint32_t CountLeadingEmptyOrDeleted() const {
constexpr uint64_t gaps = 0x00FEFEFEFEFEFEFEULL;
return (TrailingZeros(((~ctrl & (ctrl >> 7)) | gaps) + 1) + 7) >> 3;
}
void ConvertSpecialToEmptyAndFullToDeleted(ctrl_t* dst) const {
constexpr uint64_t msbs = 0x8080808080808080ULL;
constexpr uint64_t lsbs = 0x0101010101010101ULL;
auto x = ctrl & msbs;
auto res = (~x + (x >> 7)) & ~lsbs;
little_endian::Store64(dst, res);
}
uint64_t ctrl;
};
Export of internal Abseil changes. -- ee19e203eca970ff88e8f25ce4e19c32e143b988 by Jon Cohen <cohenjon@google.com>: Exception safety testing no longer uses absl::optional PiperOrigin-RevId: 220336204 -- 460666eb0b316a8b4aeedc589644d53b05251bd1 by Derek Mauro <dmauro@google.com>: Rework SwissTable SSE2 support - Use SSE2 on MSVC when available https://github.com/abseil/abseil-cpp/issues/210 - Emulate _mm_cmpgt_epi8 with other SSE2 instructions when using -funsigned-char under GCC https://github.com/abseil/abseil-cpp/issues/209 PiperOrigin-RevId: 220312351 -- 1f4318ecedf8d539b7b698eb803d613ad6b69278 by Abseil Team <absl-team@google.com>: Change CollectPerfectRatios to use 10 trials to smooth out the outliers in the sample. PiperOrigin-RevId: 220286579 -- 6755abc2673553a7f578bb29c6e9ca8d991bc9c8 by Abseil Team <absl-team@google.com>: Internal change PiperOrigin-RevId: 220274307 -- 8645b6187329ebf0aaf3c2de2888ba44466cd879 by Abseil Team <absl-team@google.com>: * #endif for a header guard should reference the guard macro in a comment PiperOrigin-RevId: 220206868 -- 3987a7ad11319230910931cd2468b60b3fd1b85c by Gennadiy Civil <misterg@google.com>: Internal Change PiperOrigin-RevId: 220136674 -- cc908c1db2ee0d4523dc813e33f600583bb986c5 by Abseil Team <absl-team@google.com>: absl: fix backoff logic in SpinLockWait There are 3 bugs in loop variable handling: 1. It starts with 0, but AbslInternalSpinLockDelay ignores loop == 0. So it does not actually wait when it should. 2. loop is incremented after successful state changes, but it should not (why would be increase backoff delay after that?). 3. loop is incremented after CAS failures, but it should not (why would be increase backoff delay after that?). Use the same handling of loop as used in SpinLock. PiperOrigin-RevId: 220136079 -- a0a1c6ef5910ebd28e07215d7df03cc0da0b3eed by Abseil Team <absl-team@google.com>: absl: relax unnecessarily strong memory ordering in SpinLock::SlowLock We don't need to acquire visibility over anything when setting kSpinLockSleeper. Replace the confusing and unnecessarily strong memory order with relaxed. PiperOrigin-RevId: 220023380 -- c50858b51af28b9fca1a62616324f85f3e84ea74 by Tom Manshreck <shreck@google.com>: Update comments in flat_hash_map, node_hash_{set, map} and the containers developer guide PiperOrigin-RevId: 219938692 -- e87b7d1a5f61e165b1c44d3b16d8d967197cdfce by CJ Johnson <johnsoncj@google.com>: Rearranges the public methods of InlinedVector and cleans up the comments PiperOrigin-RevId: 219896257 -- f3234c466f792e0fc4bfd21fc7919dba5e679375 by CJ Johnson <johnsoncj@google.com>: Adds branch prediction to exceptional early exit cases of inlined vector's API PiperOrigin-RevId: 219887173 -- 4dfccf1a81ca0425912d3da25a8470f78c532ce4 by CJ Johnson <johnsoncj@google.com>: Fixes the InlinedVector public interface to use the allocator type references instead of assuming the type Also cleans up some cruft in formatting and comments PiperOrigin-RevId: 219878876 -- 4bb6a2b892abb10bd6a424db7e94ed8640802470 by Tom Manshreck <shreck@google.com>: Add comments on constructor and assignment operator support to flat_hash_set PiperOrigin-RevId: 219825338 -- c23f973e2f7f4feea0da36bf8a9c3f8a8954bb74 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 219823847 GitOrigin-RevId: ee19e203eca970ff88e8f25ce4e19c32e143b988 Change-Id: I288c927ca481dc57340420dbb4c278a05cf15e83
2018-11-06 22:01:25 +01:00
#if SWISSTABLE_HAVE_SSE2
using Group = GroupSse2Impl;
#else
using Group = GroupPortableImpl;
#endif
template <class Policy, class Hash, class Eq, class Alloc>
class raw_hash_set;
Export of internal Abseil changes. -- 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb by Greg Falcon <gfalcon@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 238061818 -- 867a7ca318fac2991ea9a4107dbae3cc9fbf974a by Abseil Team <absl-team@google.com>: Added a IWYU export pragma when including a standard header for the purpose of aliasing its symbols. PiperOrigin-RevId: 238022277 -- 17047745058f2f151cd986ea9f649512542d3876 by Matt Armstrong <marmstrong@google.com>: Clarify the comment discouraging WrapUnique<T>(x) calls. PiperOrigin-RevId: 237873803 -- 3dcb2e4968243d33ca0ce53280c445df50f4a7ec by Samuel Benzaquen <sbenza@google.com>: Workaround clang bug https://bugs.llvm.org/show_bug.cgi?id=38289 PiperOrigin-RevId: 237873551 -- f348d2dc7087a990cbdfb95aa51fd7ff478ae40e by Samuel Benzaquen <sbenza@google.com>: Reduce minimum capacity to 1. This reduces memory usage for small tables. A flat_hash_set<int> of 1 element goes from 92 bytes to 24. A flat_hash_set<string> of 1 element goes from 512 bytes to 56. PiperOrigin-RevId: 237859811 -- 9c8125be5e4e5d22a7bb62bdec8c323338385c1b by Jon Cohen <cohenjon@google.com>: Bump to CMake 3.5. This is the oldest modern cmake being included by default in most popular OS distributions according to https://repology.org/project/cmake/versions. Specifically, Ubuntu LTS 16.04 uses cmake 3.5 (https://packages.ubuntu.com/xenial/cmake) PiperOrigin-RevId: 237859345 -- 07638d672e0a4dced986a62750cfd8318ed36ffa by Derek Mauro <dmauro@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 237714597 GitOrigin-RevId: 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb Change-Id: I5faecc45add4a5a774d4f9baf06e5519091f2ccc
2019-03-12 19:39:15 +01:00
inline bool IsValidCapacity(size_t n) { return ((n + 1) & n) == 0 && n > 0; }
// PRECONDITION:
// IsValidCapacity(capacity)
// ctrl[capacity] == kSentinel
// ctrl[i] != kSentinel for all i < capacity
// Applies mapping for every byte in ctrl:
// DELETED -> EMPTY
// EMPTY -> EMPTY
// FULL -> DELETED
inline void ConvertDeletedToEmptyAndFullToDeleted(
ctrl_t* ctrl, size_t capacity) {
assert(ctrl[capacity] == kSentinel);
assert(IsValidCapacity(capacity));
for (ctrl_t* pos = ctrl; pos != ctrl + capacity + 1; pos += Group::kWidth) {
Group{pos}.ConvertSpecialToEmptyAndFullToDeleted(pos);
}
// Copy the cloned ctrl bytes.
std::memcpy(ctrl + capacity + 1, ctrl, Group::kWidth);
ctrl[capacity] = kSentinel;
}
Export of internal Abseil changes. -- 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb by Greg Falcon <gfalcon@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 238061818 -- 867a7ca318fac2991ea9a4107dbae3cc9fbf974a by Abseil Team <absl-team@google.com>: Added a IWYU export pragma when including a standard header for the purpose of aliasing its symbols. PiperOrigin-RevId: 238022277 -- 17047745058f2f151cd986ea9f649512542d3876 by Matt Armstrong <marmstrong@google.com>: Clarify the comment discouraging WrapUnique<T>(x) calls. PiperOrigin-RevId: 237873803 -- 3dcb2e4968243d33ca0ce53280c445df50f4a7ec by Samuel Benzaquen <sbenza@google.com>: Workaround clang bug https://bugs.llvm.org/show_bug.cgi?id=38289 PiperOrigin-RevId: 237873551 -- f348d2dc7087a990cbdfb95aa51fd7ff478ae40e by Samuel Benzaquen <sbenza@google.com>: Reduce minimum capacity to 1. This reduces memory usage for small tables. A flat_hash_set<int> of 1 element goes from 92 bytes to 24. A flat_hash_set<string> of 1 element goes from 512 bytes to 56. PiperOrigin-RevId: 237859811 -- 9c8125be5e4e5d22a7bb62bdec8c323338385c1b by Jon Cohen <cohenjon@google.com>: Bump to CMake 3.5. This is the oldest modern cmake being included by default in most popular OS distributions according to https://repology.org/project/cmake/versions. Specifically, Ubuntu LTS 16.04 uses cmake 3.5 (https://packages.ubuntu.com/xenial/cmake) PiperOrigin-RevId: 237859345 -- 07638d672e0a4dced986a62750cfd8318ed36ffa by Derek Mauro <dmauro@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 237714597 GitOrigin-RevId: 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb Change-Id: I5faecc45add4a5a774d4f9baf06e5519091f2ccc
2019-03-12 19:39:15 +01:00
// Rounds up the capacity to the next power of 2 minus 1, with a minimum of 1.
inline size_t NormalizeCapacity(size_t n) {
Export of internal Abseil changes. -- 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb by Greg Falcon <gfalcon@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 238061818 -- 867a7ca318fac2991ea9a4107dbae3cc9fbf974a by Abseil Team <absl-team@google.com>: Added a IWYU export pragma when including a standard header for the purpose of aliasing its symbols. PiperOrigin-RevId: 238022277 -- 17047745058f2f151cd986ea9f649512542d3876 by Matt Armstrong <marmstrong@google.com>: Clarify the comment discouraging WrapUnique<T>(x) calls. PiperOrigin-RevId: 237873803 -- 3dcb2e4968243d33ca0ce53280c445df50f4a7ec by Samuel Benzaquen <sbenza@google.com>: Workaround clang bug https://bugs.llvm.org/show_bug.cgi?id=38289 PiperOrigin-RevId: 237873551 -- f348d2dc7087a990cbdfb95aa51fd7ff478ae40e by Samuel Benzaquen <sbenza@google.com>: Reduce minimum capacity to 1. This reduces memory usage for small tables. A flat_hash_set<int> of 1 element goes from 92 bytes to 24. A flat_hash_set<string> of 1 element goes from 512 bytes to 56. PiperOrigin-RevId: 237859811 -- 9c8125be5e4e5d22a7bb62bdec8c323338385c1b by Jon Cohen <cohenjon@google.com>: Bump to CMake 3.5. This is the oldest modern cmake being included by default in most popular OS distributions according to https://repology.org/project/cmake/versions. Specifically, Ubuntu LTS 16.04 uses cmake 3.5 (https://packages.ubuntu.com/xenial/cmake) PiperOrigin-RevId: 237859345 -- 07638d672e0a4dced986a62750cfd8318ed36ffa by Derek Mauro <dmauro@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 237714597 GitOrigin-RevId: 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb Change-Id: I5faecc45add4a5a774d4f9baf06e5519091f2ccc
2019-03-12 19:39:15 +01:00
return n ? ~size_t{} >> LeadingZeros(n) : 1;
}
// We use 7/8th as maximum load factor.
// For 16-wide groups, that gives an average of two empty slots per group.
inline size_t CapacityToGrowth(size_t capacity) {
assert(IsValidCapacity(capacity));
// `capacity*7/8`
if (Group::kWidth == 8 && capacity == 7) {
// x-x/8 does not work when x==7.
return 6;
}
return capacity - capacity / 8;
}
// From desired "growth" to a lowerbound of the necessary capacity.
// Might not be a valid one and required NormalizeCapacity().
inline size_t GrowthToLowerboundCapacity(size_t growth) {
// `growth*8/7`
if (Group::kWidth == 8 && growth == 7) {
// x+(x-1)/7 does not work when x==7.
return 8;
}
return growth + static_cast<size_t>((static_cast<int64_t>(growth) - 1) / 7);
}
// Policy: a policy defines how to perform different operations on
// the slots of the hashtable (see hash_policy_traits.h for the full interface
// of policy).
//
// Hash: a (possibly polymorphic) functor that hashes keys of the hashtable. The
// functor should accept a key and return size_t as hash. For best performance
// it is important that the hash function provides high entropy across all bits
// of the hash.
//
// Eq: a (possibly polymorphic) functor that compares two keys for equality. It
// should accept two (of possibly different type) keys and return a bool: true
// if they are equal, false if they are not. If two keys compare equal, then
// their hash values as defined by Hash MUST be equal.
//
// Allocator: an Allocator [https://devdocs.io/cpp/concept/allocator] with which
// the storage of the hashtable will be allocated and the elements will be
// constructed and destroyed.
template <class Policy, class Hash, class Eq, class Alloc>
class raw_hash_set {
using PolicyTraits = hash_policy_traits<Policy>;
using KeyArgImpl =
KeyArg<IsTransparent<Eq>::value && IsTransparent<Hash>::value>;
public:
using init_type = typename PolicyTraits::init_type;
using key_type = typename PolicyTraits::key_type;
// TODO(sbenza): Hide slot_type as it is an implementation detail. Needs user
// code fixes!
using slot_type = typename PolicyTraits::slot_type;
using allocator_type = Alloc;
using size_type = size_t;
using difference_type = ptrdiff_t;
using hasher = Hash;
using key_equal = Eq;
using policy_type = Policy;
using value_type = typename PolicyTraits::value_type;
using reference = value_type&;
using const_reference = const value_type&;
using pointer = typename absl::allocator_traits<
allocator_type>::template rebind_traits<value_type>::pointer;
using const_pointer = typename absl::allocator_traits<
allocator_type>::template rebind_traits<value_type>::const_pointer;
// Alias used for heterogeneous lookup functions.
// `key_arg<K>` evaluates to `K` when the functors are transparent and to
// `key_type` otherwise. It permits template argument deduction on `K` for the
// transparent case.
template <class K>
using key_arg = typename KeyArgImpl::template type<K, key_type>;
private:
// Give an early error when key_type is not hashable/eq.
auto KeyTypeCanBeHashed(const Hash& h, const key_type& k) -> decltype(h(k));
auto KeyTypeCanBeEq(const Eq& eq, const key_type& k) -> decltype(eq(k, k));
using Layout = absl::container_internal::Layout<ctrl_t, slot_type>;
static Layout MakeLayout(size_t capacity) {
assert(IsValidCapacity(capacity));
return Layout(capacity + Group::kWidth + 1, capacity);
}
using AllocTraits = absl::allocator_traits<allocator_type>;
using SlotAlloc = typename absl::allocator_traits<
allocator_type>::template rebind_alloc<slot_type>;
using SlotAllocTraits = typename absl::allocator_traits<
allocator_type>::template rebind_traits<slot_type>;
static_assert(std::is_lvalue_reference<reference>::value,
"Policy::element() must return a reference");
template <typename T>
struct SameAsElementReference
: std::is_same<typename std::remove_cv<
typename std::remove_reference<reference>::type>::type,
typename std::remove_cv<
typename std::remove_reference<T>::type>::type> {};
// An enabler for insert(T&&): T must be convertible to init_type or be the
// same as [cv] value_type [ref].
// Note: we separate SameAsElementReference into its own type to avoid using
// reference unless we need to. MSVC doesn't seem to like it in some
// cases.
template <class T>
using RequiresInsertable = typename std::enable_if<
absl::disjunction<std::is_convertible<T, init_type>,
SameAsElementReference<T>>::value,
int>::type;
// RequiresNotInit is a workaround for gcc prior to 7.1.
// See https://godbolt.org/g/Y4xsUh.
template <class T>
using RequiresNotInit =
typename std::enable_if<!std::is_same<T, init_type>::value, int>::type;
template <class... Ts>
using IsDecomposable = IsDecomposable<void, PolicyTraits, Hash, Eq, Ts...>;
public:
static_assert(std::is_same<pointer, value_type*>::value,
"Allocators with custom pointer types are not supported");
static_assert(std::is_same<const_pointer, const value_type*>::value,
"Allocators with custom pointer types are not supported");
class iterator {
friend class raw_hash_set;
public:
using iterator_category = std::forward_iterator_tag;
using value_type = typename raw_hash_set::value_type;
using reference =
absl::conditional_t<PolicyTraits::constant_iterators::value,
const value_type&, value_type&>;
using pointer = absl::remove_reference_t<reference>*;
using difference_type = typename raw_hash_set::difference_type;
iterator() {}
// PRECONDITION: not an end() iterator.
reference operator*() const { return PolicyTraits::element(slot_); }
// PRECONDITION: not an end() iterator.
pointer operator->() const { return &operator*(); }
// PRECONDITION: not an end() iterator.
iterator& operator++() {
++ctrl_;
++slot_;
skip_empty_or_deleted();
return *this;
}
// PRECONDITION: not an end() iterator.
iterator operator++(int) {
auto tmp = *this;
++*this;
return tmp;
}
friend bool operator==(const iterator& a, const iterator& b) {
return a.ctrl_ == b.ctrl_;
}
friend bool operator!=(const iterator& a, const iterator& b) {
return !(a == b);
}
private:
iterator(ctrl_t* ctrl) : ctrl_(ctrl) {} // for end()
iterator(ctrl_t* ctrl, slot_type* slot) : ctrl_(ctrl), slot_(slot) {}
void skip_empty_or_deleted() {
while (IsEmptyOrDeleted(*ctrl_)) {
// ctrl is not necessarily aligned to Group::kWidth. It is also likely
// to read past the space for ctrl bytes and into slots. This is ok
// because ctrl has sizeof() == 1 and slot has sizeof() >= 1 so there
// is no way to read outside the combined slot array.
uint32_t shift = Group{ctrl_}.CountLeadingEmptyOrDeleted();
ctrl_ += shift;
slot_ += shift;
}
}
ctrl_t* ctrl_ = nullptr;
Export of internal Abseil changes. -- 5f1cf6547231f1b1daad6d1b785df6b0b999b3c9 by Samuel Benzaquen <sbenza@google.com>: Fix uninitialized member in the `iterator` class by using a union of the two possible states of the iterator. This silences a Wuninitialized warning in gcc>=7. PiperOrigin-RevId: 228175148 -- 98b4e3204c0ec3cfd4cb037e24d443ea4b63fc84 by CJ Johnson <johnsoncj@google.com>: Factors out the implementation of InlinedVector::swap(...) into a private member function PiperOrigin-RevId: 228173383 -- f1432ad3a8b05285c6d55bc4754cfae765485b7f by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 227891984 -- 03fc00c7a4efc6000e6d9125cb2e252bffda76fe by Andy Getzendanner <durandal@google.com>: Add a missing linebreak to a comment and markdownify two unordered lists. PiperOrigin-RevId: 227861389 -- 0d66c9afba4fc9aa52e61d9fb410e165018a7b48 by Abseil Team <absl-team@google.com>: Add an API to register a new source for the cycle clock. PiperOrigin-RevId: 227779218 -- 14d3f9b70c8818b8541e5fb2f6ca4c59d479de31 by Andy Getzendanner <durandal@google.com>: Correct a typo in a stripping marker. PiperOrigin-RevId: 227750014 -- 59df88740f4e315beb57a8772f8bcf7879440c74 by Matt Kulukundis <kfm@google.com>: Switch thread local handling to be more cross platform PiperOrigin-RevId: 227695133 -- 75deed5bfcb5c42534e933f104aa7d94e11e348d by Abseil Team <absl-team@google.com>: Rollback workaround toolchain bug for incorrect handling of thread_local in inline functions PiperOrigin-RevId: 227689133 -- 54994bf0afec026e6e0e7a199df0bbb4b7d9a4aa by Derek Mauro <dmauro@google.com>: Add -pthread to linkopts where it actually belongs, on the library that uses it. Fixes https://github.com/abseil/abseil-cpp/issues/240. PiperOrigin-RevId: 227612492 -- 893875f3536b7e0a1bad993aa6b2e083abb3b25a by Derek Mauro <dmauro@google.com>: Internal change PiperOrigin-RevId: 227582833 -- 506c9b8e9002ca3389c7040473b68d4cbf94bdcc by Matt Kulukundis <kfm@google.com>: Workaround toolchain bug for incorrect handling of thread_local in inline functions PiperOrigin-RevId: 227561449 -- 29ee90d96dfe3114cf93f9bb92ea0cc9e768a407 by Derek Mauro <dmauro@google.com>: Internal change PiperOrigin-RevId: 227054634 GitOrigin-RevId: 5f1cf6547231f1b1daad6d1b785df6b0b999b3c9 Change-Id: Ibc90566d92ee6e0ad7e150f513ec7f5d22ec0a94
2019-01-07 18:01:16 +01:00
// To avoid uninitialized member warnigs, put slot_ in an anonymous union.
// The member is not initialized on singleton and end iterators.
union {
slot_type* slot_;
};
};
class const_iterator {
friend class raw_hash_set;
public:
using iterator_category = typename iterator::iterator_category;
using value_type = typename raw_hash_set::value_type;
using reference = typename raw_hash_set::const_reference;
using pointer = typename raw_hash_set::const_pointer;
using difference_type = typename raw_hash_set::difference_type;
const_iterator() {}
// Implicit construction from iterator.
const_iterator(iterator i) : inner_(std::move(i)) {}
reference operator*() const { return *inner_; }
pointer operator->() const { return inner_.operator->(); }
const_iterator& operator++() {
++inner_;
return *this;
}
const_iterator operator++(int) { return inner_++; }
friend bool operator==(const const_iterator& a, const const_iterator& b) {
return a.inner_ == b.inner_;
}
friend bool operator!=(const const_iterator& a, const const_iterator& b) {
return !(a == b);
}
private:
const_iterator(const ctrl_t* ctrl, const slot_type* slot)
: inner_(const_cast<ctrl_t*>(ctrl), const_cast<slot_type*>(slot)) {}
iterator inner_;
};
Export of internal Abseil changes. -- 5da9755667df37e38ccaf6938c9f408e294110bb by Shaindel Schwartz <shaindel@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 232942734 -- b6fb275769c66fdd2bd92b119198c59e9a7dd737 by Samuel Benzaquen <sbenza@google.com>: Fix integral underflow when from-arg width is INT_MIN. PiperOrigin-RevId: 232888037 -- 4135dbba4a26c4642277fc2a7e2a833d593daa1c by Abseil Team <absl-team@google.com>: Add the insert_return_type alias to raw_hash_set. PiperOrigin-RevId: 232683892 -- 0b120b7d3693800bbb886f6fc607ae54a9338cb1 by Abseil Team <absl-team@google.com>: Macros to detect and disabled SafeStack https://clang.llvm.org/docs/SafeStack.html PiperOrigin-RevId: 232680114 -- a77b3fb533a9e37966d1d6ef5ccd09c73fff2ca1 by Abseil Team <absl-team@google.com>: Avoid potential red zone clobber Pushing on the stack on x86-64 may clobber local variables held below %rsp in the red zone. Avoid this by using lea on x86-64. PiperOrigin-RevId: 232592478 -- bf326a0eefa92f4e704287563df0c5a5b1873b6d by Eric Fiselier <ericwf@google.com>: Add additional tests for AbslHashValue. PiperOrigin-RevId: 232344325 -- 816e4f98fd7632c944c779db87b7dac4e138afcf by Eric Fiselier <ericwf@google.com>: Avoid upcoming GCC 9.0 warnings about base class init. Currently, in trunk, GCC has a new warning under -Wextra that diagnoses when a derived class fails to explicitly initialize the base class in a constructor initializer list. This patch avoids this warning. PiperOrigin-RevId: 232327626 -- 779c0f44b3c2b7a04d4bdf978641eb8180515bf6 by Eric Fiselier <ericwf@google.com>: Guard against C++2a char8_t change. PiperOrigin-RevId: 232326178 -- 41e5395b85bbbfb5bf418cc21b04ad4ccb15a284 by Eric Fiselier <ericwf@google.com>: Avoid Clang Warning PiperOrigin-RevId: 232138866 GitOrigin-RevId: 5da9755667df37e38ccaf6938c9f408e294110bb Change-Id: I49ee4f58db177b81b039d7d949f671c97c5a7933
2019-02-07 23:13:06 +01:00
using node_type = node_handle<Policy, hash_policy_traits<Policy>, Alloc>;
using insert_return_type = InsertReturnType<iterator, node_type>;
raw_hash_set() noexcept(
std::is_nothrow_default_constructible<hasher>::value&&
std::is_nothrow_default_constructible<key_equal>::value&&
std::is_nothrow_default_constructible<allocator_type>::value) {}
explicit raw_hash_set(size_t bucket_count, const hasher& hash = hasher(),
const key_equal& eq = key_equal(),
const allocator_type& alloc = allocator_type())
: ctrl_(EmptyGroup()), settings_(0, hash, eq, alloc) {
if (bucket_count) {
capacity_ = NormalizeCapacity(bucket_count);
reset_growth_left();
initialize_slots();
}
}
raw_hash_set(size_t bucket_count, const hasher& hash,
const allocator_type& alloc)
: raw_hash_set(bucket_count, hash, key_equal(), alloc) {}
raw_hash_set(size_t bucket_count, const allocator_type& alloc)
: raw_hash_set(bucket_count, hasher(), key_equal(), alloc) {}
explicit raw_hash_set(const allocator_type& alloc)
: raw_hash_set(0, hasher(), key_equal(), alloc) {}
template <class InputIter>
raw_hash_set(InputIter first, InputIter last, size_t bucket_count = 0,
const hasher& hash = hasher(), const key_equal& eq = key_equal(),
const allocator_type& alloc = allocator_type())
: raw_hash_set(bucket_count, hash, eq, alloc) {
insert(first, last);
}
template <class InputIter>
raw_hash_set(InputIter first, InputIter last, size_t bucket_count,
const hasher& hash, const allocator_type& alloc)
: raw_hash_set(first, last, bucket_count, hash, key_equal(), alloc) {}
template <class InputIter>
raw_hash_set(InputIter first, InputIter last, size_t bucket_count,
const allocator_type& alloc)
: raw_hash_set(first, last, bucket_count, hasher(), key_equal(), alloc) {}
template <class InputIter>
raw_hash_set(InputIter first, InputIter last, const allocator_type& alloc)
: raw_hash_set(first, last, 0, hasher(), key_equal(), alloc) {}
// Instead of accepting std::initializer_list<value_type> as the first
// argument like std::unordered_set<value_type> does, we have two overloads
// that accept std::initializer_list<T> and std::initializer_list<init_type>.
// This is advantageous for performance.
//
// // Turns {"abc", "def"} into std::initializer_list<std::string>, then
// // copies the strings into the set.
// std::unordered_set<std::string> s = {"abc", "def"};
//
// // Turns {"abc", "def"} into std::initializer_list<const char*>, then
// // copies the strings into the set.
// absl::flat_hash_set<std::string> s = {"abc", "def"};
//
// The same trick is used in insert().
//
// The enabler is necessary to prevent this constructor from triggering where
// the copy constructor is meant to be called.
//
// absl::flat_hash_set<int> a, b{a};
//
// RequiresNotInit<T> is a workaround for gcc prior to 7.1.
template <class T, RequiresNotInit<T> = 0, RequiresInsertable<T> = 0>
raw_hash_set(std::initializer_list<T> init, size_t bucket_count = 0,
const hasher& hash = hasher(), const key_equal& eq = key_equal(),
const allocator_type& alloc = allocator_type())
: raw_hash_set(init.begin(), init.end(), bucket_count, hash, eq, alloc) {}
raw_hash_set(std::initializer_list<init_type> init, size_t bucket_count = 0,
const hasher& hash = hasher(), const key_equal& eq = key_equal(),
const allocator_type& alloc = allocator_type())
: raw_hash_set(init.begin(), init.end(), bucket_count, hash, eq, alloc) {}
template <class T, RequiresNotInit<T> = 0, RequiresInsertable<T> = 0>
raw_hash_set(std::initializer_list<T> init, size_t bucket_count,
const hasher& hash, const allocator_type& alloc)
: raw_hash_set(init, bucket_count, hash, key_equal(), alloc) {}
raw_hash_set(std::initializer_list<init_type> init, size_t bucket_count,
const hasher& hash, const allocator_type& alloc)
: raw_hash_set(init, bucket_count, hash, key_equal(), alloc) {}
template <class T, RequiresNotInit<T> = 0, RequiresInsertable<T> = 0>
raw_hash_set(std::initializer_list<T> init, size_t bucket_count,
const allocator_type& alloc)
: raw_hash_set(init, bucket_count, hasher(), key_equal(), alloc) {}
raw_hash_set(std::initializer_list<init_type> init, size_t bucket_count,
const allocator_type& alloc)
: raw_hash_set(init, bucket_count, hasher(), key_equal(), alloc) {}
template <class T, RequiresNotInit<T> = 0, RequiresInsertable<T> = 0>
raw_hash_set(std::initializer_list<T> init, const allocator_type& alloc)
: raw_hash_set(init, 0, hasher(), key_equal(), alloc) {}
raw_hash_set(std::initializer_list<init_type> init,
const allocator_type& alloc)
: raw_hash_set(init, 0, hasher(), key_equal(), alloc) {}
raw_hash_set(const raw_hash_set& that)
: raw_hash_set(that, AllocTraits::select_on_container_copy_construction(
that.alloc_ref())) {}
raw_hash_set(const raw_hash_set& that, const allocator_type& a)
: raw_hash_set(0, that.hash_ref(), that.eq_ref(), a) {
reserve(that.size());
// Because the table is guaranteed to be empty, we can do something faster
// than a full `insert`.
for (const auto& v : that) {
const size_t hash = PolicyTraits::apply(HashElement{hash_ref()}, v);
Export of internal Abseil changes. -- 7fa1107161a03dac53fb84c2b06d8092616c7b13 by Abseil Team <absl-team@google.com>: Harden the generic stacktrace implementation for use during early program execution PiperOrigin-RevId: 226375950 -- 079f9969329f5eb66f647dd3c44b17541b1bf217 by Matt Kulukundis <kfm@google.com>: Workaround platforms that have over-aggressive warnings on -Wexit-time-destructors PiperOrigin-RevId: 226362948 -- 1447943f509be681ca5495add0162c750ef237f1 by Matt Kulukundis <kfm@google.com>: Switch from 64 to size_t atomics so they work on embedded platforms that do not have 64 bit atomics. PiperOrigin-RevId: 226210704 -- d14d49837ae2bcde74051e0c79c18ee0f43866b9 by Tom Manshreck <shreck@google.com>: Develop initial documentation for API breaking changes process: PiperOrigin-RevId: 226210021 -- 7ea3d7fe0e86979dab83a5fc9cc3bf1d6cb3bd53 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 226195522 -- 7de873e880d7f016a4fa1e08d626f0535cc470af by Abseil Team <absl-team@google.com>: Make Abseil LICENSE files newline terminated, with a single trailing blank line. Also remove line-ending whitespace. PiperOrigin-RevId: 226182949 -- 7d00643fadfad7f0d992c68bd9d2ed2e5bc960b0 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226045282 -- c4a0a11c0ce2875271191e477f3d36eaaeca4613 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226038273 -- 8ee4ebbb1ae5cda119e436e5ff7e3aa966608c10 by Matt Kulukundis <kfm@google.com>: Adds a global sampler which tracks a fraction of live tables for collecting telemetry data. PiperOrigin-RevId: 226032080 -- d576446f050518cd1b0ae447d682d8552f0e7e30 by Mark Barolak <mbar@google.com>: Replace an internal CaseEqual function with calls to the identical absl::EqualsIgnoreCase. This closes out a rather old TODO. PiperOrigin-RevId: 226024779 -- 6b23f1ee028a5ffa608c920424f1220a117a8f3d by Abseil Team <absl-team@google.com>: Add December 2018 LTS branch to list of LTS branches. PiperOrigin-RevId: 226011333 -- bb0833a43bdaef4c8c059b17bcd27ba9a085a114 by Mark Barolak <mbar@google.com>: Explicitly state that when the SimpleAtoi family of functions encounter an error, the value of their output parameter is unspecified. Also standardize the name of the output parameter to be `out`. PiperOrigin-RevId: 225997035 -- 46c1876b1a248eabda7545daa61a74a4cdfe9077 by Abseil Team <absl-team@google.com>: Remove deprecated CMake function absl_test, absl_library and absl_header_library PiperOrigin-RevId: 225950041 GitOrigin-RevId: 7fa1107161a03dac53fb84c2b06d8092616c7b13 Change-Id: I2ca9d3aada9292614527d1339a7557494139b806
2018-12-20 21:29:59 +01:00
auto target = find_first_non_full(hash);
set_ctrl(target.offset, H2(hash));
emplace_at(target.offset, v);
infoz_.RecordInsert(hash, target.probe_length);
}
size_ = that.size();
growth_left() -= that.size();
}
raw_hash_set(raw_hash_set&& that) noexcept(
std::is_nothrow_copy_constructible<hasher>::value&&
std::is_nothrow_copy_constructible<key_equal>::value&&
std::is_nothrow_copy_constructible<allocator_type>::value)
: ctrl_(absl::exchange(that.ctrl_, EmptyGroup())),
slots_(absl::exchange(that.slots_, nullptr)),
size_(absl::exchange(that.size_, 0)),
capacity_(absl::exchange(that.capacity_, 0)),
Export of internal Abseil changes. -- 7fa1107161a03dac53fb84c2b06d8092616c7b13 by Abseil Team <absl-team@google.com>: Harden the generic stacktrace implementation for use during early program execution PiperOrigin-RevId: 226375950 -- 079f9969329f5eb66f647dd3c44b17541b1bf217 by Matt Kulukundis <kfm@google.com>: Workaround platforms that have over-aggressive warnings on -Wexit-time-destructors PiperOrigin-RevId: 226362948 -- 1447943f509be681ca5495add0162c750ef237f1 by Matt Kulukundis <kfm@google.com>: Switch from 64 to size_t atomics so they work on embedded platforms that do not have 64 bit atomics. PiperOrigin-RevId: 226210704 -- d14d49837ae2bcde74051e0c79c18ee0f43866b9 by Tom Manshreck <shreck@google.com>: Develop initial documentation for API breaking changes process: PiperOrigin-RevId: 226210021 -- 7ea3d7fe0e86979dab83a5fc9cc3bf1d6cb3bd53 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 226195522 -- 7de873e880d7f016a4fa1e08d626f0535cc470af by Abseil Team <absl-team@google.com>: Make Abseil LICENSE files newline terminated, with a single trailing blank line. Also remove line-ending whitespace. PiperOrigin-RevId: 226182949 -- 7d00643fadfad7f0d992c68bd9d2ed2e5bc960b0 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226045282 -- c4a0a11c0ce2875271191e477f3d36eaaeca4613 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226038273 -- 8ee4ebbb1ae5cda119e436e5ff7e3aa966608c10 by Matt Kulukundis <kfm@google.com>: Adds a global sampler which tracks a fraction of live tables for collecting telemetry data. PiperOrigin-RevId: 226032080 -- d576446f050518cd1b0ae447d682d8552f0e7e30 by Mark Barolak <mbar@google.com>: Replace an internal CaseEqual function with calls to the identical absl::EqualsIgnoreCase. This closes out a rather old TODO. PiperOrigin-RevId: 226024779 -- 6b23f1ee028a5ffa608c920424f1220a117a8f3d by Abseil Team <absl-team@google.com>: Add December 2018 LTS branch to list of LTS branches. PiperOrigin-RevId: 226011333 -- bb0833a43bdaef4c8c059b17bcd27ba9a085a114 by Mark Barolak <mbar@google.com>: Explicitly state that when the SimpleAtoi family of functions encounter an error, the value of their output parameter is unspecified. Also standardize the name of the output parameter to be `out`. PiperOrigin-RevId: 225997035 -- 46c1876b1a248eabda7545daa61a74a4cdfe9077 by Abseil Team <absl-team@google.com>: Remove deprecated CMake function absl_test, absl_library and absl_header_library PiperOrigin-RevId: 225950041 GitOrigin-RevId: 7fa1107161a03dac53fb84c2b06d8092616c7b13 Change-Id: I2ca9d3aada9292614527d1339a7557494139b806
2018-12-20 21:29:59 +01:00
infoz_(absl::exchange(that.infoz_, HashtablezInfoHandle())),
// Hash, equality and allocator are copied instead of moved because
// `that` must be left valid. If Hash is std::function<Key>, moving it
// would create a nullptr functor that cannot be called.
settings_(that.settings_) {
// growth_left was copied above, reset the one from `that`.
that.growth_left() = 0;
}
raw_hash_set(raw_hash_set&& that, const allocator_type& a)
: ctrl_(EmptyGroup()),
slots_(nullptr),
size_(0),
capacity_(0),
settings_(0, that.hash_ref(), that.eq_ref(), a) {
if (a == that.alloc_ref()) {
std::swap(ctrl_, that.ctrl_);
std::swap(slots_, that.slots_);
std::swap(size_, that.size_);
std::swap(capacity_, that.capacity_);
std::swap(growth_left(), that.growth_left());
Export of internal Abseil changes. -- 7fa1107161a03dac53fb84c2b06d8092616c7b13 by Abseil Team <absl-team@google.com>: Harden the generic stacktrace implementation for use during early program execution PiperOrigin-RevId: 226375950 -- 079f9969329f5eb66f647dd3c44b17541b1bf217 by Matt Kulukundis <kfm@google.com>: Workaround platforms that have over-aggressive warnings on -Wexit-time-destructors PiperOrigin-RevId: 226362948 -- 1447943f509be681ca5495add0162c750ef237f1 by Matt Kulukundis <kfm@google.com>: Switch from 64 to size_t atomics so they work on embedded platforms that do not have 64 bit atomics. PiperOrigin-RevId: 226210704 -- d14d49837ae2bcde74051e0c79c18ee0f43866b9 by Tom Manshreck <shreck@google.com>: Develop initial documentation for API breaking changes process: PiperOrigin-RevId: 226210021 -- 7ea3d7fe0e86979dab83a5fc9cc3bf1d6cb3bd53 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 226195522 -- 7de873e880d7f016a4fa1e08d626f0535cc470af by Abseil Team <absl-team@google.com>: Make Abseil LICENSE files newline terminated, with a single trailing blank line. Also remove line-ending whitespace. PiperOrigin-RevId: 226182949 -- 7d00643fadfad7f0d992c68bd9d2ed2e5bc960b0 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226045282 -- c4a0a11c0ce2875271191e477f3d36eaaeca4613 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226038273 -- 8ee4ebbb1ae5cda119e436e5ff7e3aa966608c10 by Matt Kulukundis <kfm@google.com>: Adds a global sampler which tracks a fraction of live tables for collecting telemetry data. PiperOrigin-RevId: 226032080 -- d576446f050518cd1b0ae447d682d8552f0e7e30 by Mark Barolak <mbar@google.com>: Replace an internal CaseEqual function with calls to the identical absl::EqualsIgnoreCase. This closes out a rather old TODO. PiperOrigin-RevId: 226024779 -- 6b23f1ee028a5ffa608c920424f1220a117a8f3d by Abseil Team <absl-team@google.com>: Add December 2018 LTS branch to list of LTS branches. PiperOrigin-RevId: 226011333 -- bb0833a43bdaef4c8c059b17bcd27ba9a085a114 by Mark Barolak <mbar@google.com>: Explicitly state that when the SimpleAtoi family of functions encounter an error, the value of their output parameter is unspecified. Also standardize the name of the output parameter to be `out`. PiperOrigin-RevId: 225997035 -- 46c1876b1a248eabda7545daa61a74a4cdfe9077 by Abseil Team <absl-team@google.com>: Remove deprecated CMake function absl_test, absl_library and absl_header_library PiperOrigin-RevId: 225950041 GitOrigin-RevId: 7fa1107161a03dac53fb84c2b06d8092616c7b13 Change-Id: I2ca9d3aada9292614527d1339a7557494139b806
2018-12-20 21:29:59 +01:00
std::swap(infoz_, that.infoz_);
} else {
reserve(that.size());
// Note: this will copy elements of dense_set and unordered_set instead of
// moving them. This can be fixed if it ever becomes an issue.
for (auto& elem : that) insert(std::move(elem));
}
}
raw_hash_set& operator=(const raw_hash_set& that) {
raw_hash_set tmp(that,
AllocTraits::propagate_on_container_copy_assignment::value
? that.alloc_ref()
: alloc_ref());
swap(tmp);
return *this;
}
raw_hash_set& operator=(raw_hash_set&& that) noexcept(
absl::allocator_traits<allocator_type>::is_always_equal::value&&
std::is_nothrow_move_assignable<hasher>::value&&
std::is_nothrow_move_assignable<key_equal>::value) {
// TODO(sbenza): We should only use the operations from the noexcept clause
// to make sure we actually adhere to that contract.
return move_assign(
std::move(that),
typename AllocTraits::propagate_on_container_move_assignment());
}
~raw_hash_set() { destroy_slots(); }
iterator begin() {
auto it = iterator_at(0);
it.skip_empty_or_deleted();
return it;
}
iterator end() { return {ctrl_ + capacity_}; }
const_iterator begin() const {
return const_cast<raw_hash_set*>(this)->begin();
}
const_iterator end() const { return const_cast<raw_hash_set*>(this)->end(); }
const_iterator cbegin() const { return begin(); }
const_iterator cend() const { return end(); }
bool empty() const { return !size(); }
size_t size() const { return size_; }
size_t capacity() const { return capacity_; }
Export of internal Abseil changes. -- ba4dd47492748bd630462eb68b7959037fc6a11a by Abseil Team <absl-team@google.com>: Work around nvcc 9.0 compiler bug for open-source Tensorflow build. With the current implementation, when I (unintentionally and transitively) include absl/types/optional.h in a CUDA compilation unit, I get the following nvcc error message: INFO: From Compiling tensorflow/core/kernels/crop_and_resize_op_gpu.cu.cc: external/com_google_absl/absl/types/optional.h: In member function 'void absl::optional_internal::optional_data_dtor_base<T, <anonymous> >::destruct()': external/com_google_absl/absl/types/optional.h:185:50: error: '__T0' was not declared in this scope data_.~T(); I've also seen similar compilation failures online, for flat_hash_map: https://devtalk.nvidia.com/default/topic/1042599/nvcc-preprocessor-bug-causes-compilation-failure/ The bug is always around unnamed template parameters. Therefore, the workaround is to make them named. PiperOrigin-RevId: 219208288 -- dad2f40cb2e8d5017660985ef6fb57f3c3cdcc80 by CJ Johnson <johnsoncj@google.com>: Adds internal macros for catching and throwing unknown exception types PiperOrigin-RevId: 219207362 -- 0a9840328d2d86e8420b853435fdbf1f7a19d931 by Abseil Team <absl-team@google.com>: Fix typo in mutex.h comments. PiperOrigin-RevId: 219199397 -- 0d576dc7597564210bfdf91518075064756f0bf4 by Matt Calabrese <calabrese@google.com>: Internal change. PiperOrigin-RevId: 219185475 -- 66be156095571959fb19a76da8ad0b53ec37658e by Abseil Team <absl-team@google.com>: Fix alignment conformance for VS 2017 >= 15.8 (fix #193) PiperOrigin-RevId: 219129894 -- a6e1825a12587945f8194677ccfdcaba6f7aad1d by Abseil Team <absl-team@google.com>: Reapply PR #173 PiperOrigin-RevId: 219129361 -- cf72ade4881b25acc6ccaea468f69793a0fdce32 by Abseil Team <absl-team@google.com>: Update .gitignore PiperOrigin-RevId: 219127495 -- 0537490c6348a2cb489abe15638928ac5aa6982a by Jon Cohen <cohenjon@google.com>: Small refactor and reformat of error messages from the exception safety test framework. PiperOrigin-RevId: 218927773 -- 4c556ca45fa25698ad12002a00c713aeceefab73 by CJ Johnson <johnsoncj@google.com>: Updates the inlined vector swap tests to check for number of moves that took place if available PiperOrigin-RevId: 218900777 -- dcbfda0021a1e6dfa9586986b1269c06ec394053 by Mark Barolak <mbar@google.com>: Add parens around calls to std::numeric_limits<>::min and std::numeric_limits<>::max to prevent compilation errors on Windows platforms where min and max are defined as macros. PiperOrigin-RevId: 218888700 GitOrigin-RevId: ba4dd47492748bd630462eb68b7959037fc6a11a Change-Id: I0e393958eb8cb501b85f6114979f6d4d86ed996c
2018-10-29 23:53:34 +01:00
size_t max_size() const { return (std::numeric_limits<size_t>::max)(); }
Export of internal Abseil changes. -- 5804cc13b413412988248835459b90cd15ec43d9 by Abseil Team <absl-team@google.com>: Mark raw_hash_set::clear() with the ABSL_ATTRIBUTE_REINITIALIZES attribute. This prevents false positives in the clang-tidy check bugprone-use-after-move; it allows reset() to be called on a moved-from raw_hash_set without any warnings, and the raw_hash_set will thereafter be regarded as initialized again. PiperOrigin-RevId: 230717196 -- ff5961a5600ae19b69a9cba6912126cdf2858f38 by CJ Johnson <johnsoncj@google.com>: Swaps DisableIfIntegral<> for EnableIfInputIterator<> for Iterator member functions of InlinedVector PiperOrigin-RevId: 230559521 -- 3f9754ccbeecbd40f235c6f2465279e045ff51d9 by Derek Mauro <dmauro@google.com>: Import GitHub PR 254 https://github.com/abseil/abseil-cpp/pull/254 Fixes warnings from -Wclass-memaccess (base_internal::ThreadIdentity? with no trivial copy-assignment). PiperOrigin-RevId: 230536048 -- 8af03a654ce9a4a7f55384bc7eb1ed64878ac2ec by Chris Kennelly <ckennelly@google.com>: absl: cap SpinLock backoff to 4ms The current backoff logic has 3 problems: 1. It can produce too high values (up to 256ms), which can negatively affect tail latency. The value was chosen long time ago and now it's a good idea to reconsider it. 2. It does not have low bound, so on any iteration it can produce a very small value that will lead to unnecessary cpu consumption. 3. It does not increase low bound with the number of iterations. So if the SpinLock is actually somehow locked for a very prolonged time, a waiter can still wake periodically. Rework the logic to solve these problems. Add lower bound of 128us, no code should rely on absence of episodic delays in this range as they can occur everywhere. Lower upper bound to 4ms. A thread sleeping for 4ms does not consume significant cpu time (see below). Grow lower bound with the number of iterations. This is cpu consumption of a process doing usleep(x) in a loop (sampled with ps): 64us -> 4.0% 128us -> 2.7% 256us -> 3.5% 512us -> 2.8% 1024us -> 1.6% 2048us -> 0.6% 4096us -> 0.3% 8192us -> 0.0% Few millisecond sleeps do not consume significant time. PiperOrigin-RevId: 230534015 -- 37ebba92289ca556cb2412cd8b3cb4c1ead3def7 by Samuel Benzaquen <sbenza@google.com>: Add override and dispose hooks to the hashtable sampler. PiperOrigin-RevId: 230353438 -- 89c8f90175233ce9964eb3412df04e8a3cff0c0f by Andy Getzendanner <durandal@google.com>: Fix a comment typo. PiperOrigin-RevId: 229986838 GitOrigin-RevId: 5804cc13b413412988248835459b90cd15ec43d9 Change-Id: Iedb5e2cc9c0b924635c1c87b537780ab6b5b899f
2019-01-24 16:23:40 +01:00
ABSL_ATTRIBUTE_REINITIALIZES void clear() {
// Iterating over this container is O(bucket_count()). When bucket_count()
// is much greater than size(), iteration becomes prohibitively expensive.
// For clear() it is more important to reuse the allocated array when the
// container is small because allocation takes comparatively long time
// compared to destruction of the elements of the container. So we pick the
// largest bucket_count() threshold for which iteration is still fast and
// past that we simply deallocate the array.
if (capacity_ > 127) {
destroy_slots();
} else if (capacity_) {
for (size_t i = 0; i != capacity_; ++i) {
if (IsFull(ctrl_[i])) {
PolicyTraits::destroy(&alloc_ref(), slots_ + i);
}
}
size_ = 0;
reset_ctrl();
reset_growth_left();
}
assert(empty());
Export of internal Abseil changes. -- 3d20ce6cd6541579abecaba169d4b8716d511272 by Jon Cohen <cohenjon@google.com>: Only use LSAN for clang version >= 3.5. This should fix https://github.com/abseil/abseil-cpp/issues/244 PiperOrigin-RevId: 234675129 -- e15bd4ec7a81aa95cc3d09fa1e0e81d58ae478fb by Conrad Parker <conradparker@google.com>: Fix errors in apply() sample code The following changes are made: * Make the example method public. * Give the two user functions different names to avoid confusion about whether apply() can select the correct overload of a function based on its tuple argument (it can't). * Pass tuple2 to the second example apply() invocation, instead of passing its contents individually. * Fix a s/tuple/tuple3/ typo in the third example apply() invocation. PiperOrigin-RevId: 234223407 -- de0ed71e21bc76ddf9fe715fdbaef74cd0df95c7 by Abseil Team <absl-team@google.com>: First test if a macro is defined to avoid -Wundef. ABSL clients may need to compile their code with the -Wundef warning flag. It will be helpful if ABSL header files can be compiled without the -Wundef warning. How to avoid the -Wundef warning: If a macro may be undefined, we need to first test whether the macro is defined before testing its value. We can't rely on the C preprocessor rule that an undefined macro has the value 0L. PiperOrigin-RevId: 234201123 -- fa484ad7dae0cac21140a96662809ecb0ec8eb5d by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 234185697 -- d69b1baef681e27954b065375ecf9c2320463b2b by Samuel Benzaquen <sbenza@google.com>: Mix pointers more thoroughly. Some pointer alignments interact badly with the mixing constant. By mixing twice we reduce this problem. PiperOrigin-RevId: 234178401 -- 1041d0e474610f3a8fea0db90958857327d6da1c by Samuel Benzaquen <sbenza@google.com>: Record rehashes in the hashtablez struct. Only recording the probe length on insertion causes a huge overestimation of the total probe length at any given time. With natural growth, elements are inserted when the load factor is between (max load/2, max load). However, after a rehash the majority of elements are actually inserted when the load factor is less than max/2 and have a much lower average probe length. Also reset some values when the table is cleared. PiperOrigin-RevId: 234013580 -- 299205caf3c89c47339f7409bc831746602cea84 by Mark Barolak <mbar@google.com>: Fix a sample code snippet that assumes `absl::string_view::const_iterator` is `const char*`. This is generally true, however in C++17 builds, absl::string_view is an alias for std::string_view and on MSVC, the std::string_view::const_iterator is an object instead of just a pointer. PiperOrigin-RevId: 233844595 -- af6c6370cf51a1e6c1469c79dfb2a486a4009136 by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 233773470 -- 6e59e4b8e2bb6101b448f0f32b0bea81fe399ccf by Abseil Team <absl-team@google.com>: fix typo in {Starts|Ends}WithIgnoreCase comment in match.h PiperOrigin-RevId: 233662951 GitOrigin-RevId: 3d20ce6cd6541579abecaba169d4b8716d511272 Change-Id: Ib9a29b1c38c6aedf5d9f3f7f00596e8d30e864dd
2019-02-19 23:29:09 +01:00
infoz_.RecordStorageChanged(0, capacity_);
}
// This overload kicks in when the argument is an rvalue of insertable and
// decomposable type other than init_type.
//
// flat_hash_map<std::string, int> m;
// m.insert(std::make_pair("abc", 42));
template <class T, RequiresInsertable<T> = 0,
typename std::enable_if<IsDecomposable<T>::value, int>::type = 0,
T* = nullptr>
std::pair<iterator, bool> insert(T&& value) {
return emplace(std::forward<T>(value));
}
// This overload kicks in when the argument is a bitfield or an lvalue of
// insertable and decomposable type.
//
// union { int n : 1; };
// flat_hash_set<int> s;
// s.insert(n);
//
// flat_hash_set<std::string> s;
// const char* p = "hello";
// s.insert(p);
//
// TODO(romanp): Once we stop supporting gcc 5.1 and below, replace
// RequiresInsertable<T> with RequiresInsertable<const T&>.
// We are hitting this bug: https://godbolt.org/g/1Vht4f.
template <
class T, RequiresInsertable<T> = 0,
typename std::enable_if<IsDecomposable<const T&>::value, int>::type = 0>
std::pair<iterator, bool> insert(const T& value) {
return emplace(value);
}
// This overload kicks in when the argument is an rvalue of init_type. Its
// purpose is to handle brace-init-list arguments.
//
Export of internal Abseil changes. -- 78293ba4eb4981991ae7e6edd25eb9245fcd7515 by Andy Soffer <asoffer@google.com>: internal changes PiperOrigin-RevId: 247073879 -- 7bd97e3aad0c3012b89a39392a6ad3f254e9f3c3 by Derek Mauro <dmauro@google.com>: Release commandline flags PiperOrigin-RevId: 247065920 -- 2a991849fd7b140a43b073076d194b61533fd199 by Tom Manshreck <shreck@google.com>: Add documentation for built-in usage flags PiperOrigin-RevId: 247058863 -- 14157b0de45841706bbd631284191fd94c313db9 by Derek Mauro <dmauro@google.com>: Internal change PiperOrigin-RevId: 247058292 -- ed67e0a80468596e30540b367727a250fa415b68 by Abseil Team <absl-team@google.com>: Internal Change. PiperOrigin-RevId: 246828655 -- e1bc8c2aa3f90b3d56c55c5b7244e718c919265d by Abseil Team <absl-team@google.com>: Internal change PiperOrigin-RevId: 246822325 -- 907a68f287199f749cb9bdb48571b50bc34731e1 by Eric Fiselier <ericwf@google.com>: Accept vector<bool>::reference in StrCat and friends. Converting vector<bool>::reference to alphanum requires two user defined conversions, which isn't allowed. In order to accept this, we need a special constructor that is only enabled for the bool proxy types. PiperOrigin-RevId: 246626732 -- fe4295fa95cc65dee8c881ba12dd8f516e68c40d by Abseil Team <absl-team@google.com>: Clarify the proper way to define AbslHashValue, and fix confusing indentation. PiperOrigin-RevId: 246406528 -- d7174681a72d4a25c8fd2b4d9f515a0763eff87c by Gennadiy Rozental <rogeeff@google.com>: Internal change PiperOrigin-RevId: 246358214 -- a7fdc19683cf1a5885e9e1af52fcdb2db1eda53b by Abseil Team <absl-team@google.com>: Fix sample template instantiation. PiperOrigin-RevId: 246354617 -- 29a23c6835f872948d09b24d890385bf195bc995 by Abseil Team <absl-team@google.com>: Fix incorrectly copy-pasted static_assert in absl::optional::value_or The static_assert for a move-constructible type previously said the type must be copy-constructible. PiperOrigin-RevId: 246313827 -- 41884d5872d4ea2c67875b00144b8c8a5859a295 by Greg Falcon <gfalcon@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 245418790 -- 7f90a7f94cdd5e21232c749efe952a750b5c43a2 by Abseil Team <absl-team@google.com>: Internal change PiperOrigin-RevId: 245412658 -- 730a329cf047d54b46971fce1781edd857208c2a by Greg Falcon <gfalcon@google.com>: internal change PiperOrigin-RevId: 245293234 -- cf0216be6338200cbb18167d3f3b2e98e372be77 by Greg Falcon <gfalcon@google.com>: Internal change PiperOrigin-RevId: 245288164 GitOrigin-RevId: 78293ba4eb4981991ae7e6edd25eb9245fcd7515 Change-Id: I5ea9a852c36c722bae2d6be65fb7f72473d94ab6
2019-05-07 21:56:42 +02:00
// flat_hash_map<std::string, int> s;
// s.insert({"abc", 42});
std::pair<iterator, bool> insert(init_type&& value) {
return emplace(std::move(value));
}
template <class T, RequiresInsertable<T> = 0,
typename std::enable_if<IsDecomposable<T>::value, int>::type = 0,
T* = nullptr>
iterator insert(const_iterator, T&& value) {
return insert(std::forward<T>(value)).first;
}
// TODO(romanp): Once we stop supporting gcc 5.1 and below, replace
// RequiresInsertable<T> with RequiresInsertable<const T&>.
// We are hitting this bug: https://godbolt.org/g/1Vht4f.
template <
class T, RequiresInsertable<T> = 0,
typename std::enable_if<IsDecomposable<const T&>::value, int>::type = 0>
iterator insert(const_iterator, const T& value) {
return insert(value).first;
}
iterator insert(const_iterator, init_type&& value) {
return insert(std::move(value)).first;
}
template <class InputIt>
void insert(InputIt first, InputIt last) {
for (; first != last; ++first) insert(*first);
}
template <class T, RequiresNotInit<T> = 0, RequiresInsertable<const T&> = 0>
void insert(std::initializer_list<T> ilist) {
insert(ilist.begin(), ilist.end());
}
void insert(std::initializer_list<init_type> ilist) {
insert(ilist.begin(), ilist.end());
}
Export of internal Abseil changes. -- 5da9755667df37e38ccaf6938c9f408e294110bb by Shaindel Schwartz <shaindel@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 232942734 -- b6fb275769c66fdd2bd92b119198c59e9a7dd737 by Samuel Benzaquen <sbenza@google.com>: Fix integral underflow when from-arg width is INT_MIN. PiperOrigin-RevId: 232888037 -- 4135dbba4a26c4642277fc2a7e2a833d593daa1c by Abseil Team <absl-team@google.com>: Add the insert_return_type alias to raw_hash_set. PiperOrigin-RevId: 232683892 -- 0b120b7d3693800bbb886f6fc607ae54a9338cb1 by Abseil Team <absl-team@google.com>: Macros to detect and disabled SafeStack https://clang.llvm.org/docs/SafeStack.html PiperOrigin-RevId: 232680114 -- a77b3fb533a9e37966d1d6ef5ccd09c73fff2ca1 by Abseil Team <absl-team@google.com>: Avoid potential red zone clobber Pushing on the stack on x86-64 may clobber local variables held below %rsp in the red zone. Avoid this by using lea on x86-64. PiperOrigin-RevId: 232592478 -- bf326a0eefa92f4e704287563df0c5a5b1873b6d by Eric Fiselier <ericwf@google.com>: Add additional tests for AbslHashValue. PiperOrigin-RevId: 232344325 -- 816e4f98fd7632c944c779db87b7dac4e138afcf by Eric Fiselier <ericwf@google.com>: Avoid upcoming GCC 9.0 warnings about base class init. Currently, in trunk, GCC has a new warning under -Wextra that diagnoses when a derived class fails to explicitly initialize the base class in a constructor initializer list. This patch avoids this warning. PiperOrigin-RevId: 232327626 -- 779c0f44b3c2b7a04d4bdf978641eb8180515bf6 by Eric Fiselier <ericwf@google.com>: Guard against C++2a char8_t change. PiperOrigin-RevId: 232326178 -- 41e5395b85bbbfb5bf418cc21b04ad4ccb15a284 by Eric Fiselier <ericwf@google.com>: Avoid Clang Warning PiperOrigin-RevId: 232138866 GitOrigin-RevId: 5da9755667df37e38ccaf6938c9f408e294110bb Change-Id: I49ee4f58db177b81b039d7d949f671c97c5a7933
2019-02-07 23:13:06 +01:00
insert_return_type insert(node_type&& node) {
if (!node) return {end(), false, node_type()};
Export of internal Abseil changes. -- 5da9755667df37e38ccaf6938c9f408e294110bb by Shaindel Schwartz <shaindel@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 232942734 -- b6fb275769c66fdd2bd92b119198c59e9a7dd737 by Samuel Benzaquen <sbenza@google.com>: Fix integral underflow when from-arg width is INT_MIN. PiperOrigin-RevId: 232888037 -- 4135dbba4a26c4642277fc2a7e2a833d593daa1c by Abseil Team <absl-team@google.com>: Add the insert_return_type alias to raw_hash_set. PiperOrigin-RevId: 232683892 -- 0b120b7d3693800bbb886f6fc607ae54a9338cb1 by Abseil Team <absl-team@google.com>: Macros to detect and disabled SafeStack https://clang.llvm.org/docs/SafeStack.html PiperOrigin-RevId: 232680114 -- a77b3fb533a9e37966d1d6ef5ccd09c73fff2ca1 by Abseil Team <absl-team@google.com>: Avoid potential red zone clobber Pushing on the stack on x86-64 may clobber local variables held below %rsp in the red zone. Avoid this by using lea on x86-64. PiperOrigin-RevId: 232592478 -- bf326a0eefa92f4e704287563df0c5a5b1873b6d by Eric Fiselier <ericwf@google.com>: Add additional tests for AbslHashValue. PiperOrigin-RevId: 232344325 -- 816e4f98fd7632c944c779db87b7dac4e138afcf by Eric Fiselier <ericwf@google.com>: Avoid upcoming GCC 9.0 warnings about base class init. Currently, in trunk, GCC has a new warning under -Wextra that diagnoses when a derived class fails to explicitly initialize the base class in a constructor initializer list. This patch avoids this warning. PiperOrigin-RevId: 232327626 -- 779c0f44b3c2b7a04d4bdf978641eb8180515bf6 by Eric Fiselier <ericwf@google.com>: Guard against C++2a char8_t change. PiperOrigin-RevId: 232326178 -- 41e5395b85bbbfb5bf418cc21b04ad4ccb15a284 by Eric Fiselier <ericwf@google.com>: Avoid Clang Warning PiperOrigin-RevId: 232138866 GitOrigin-RevId: 5da9755667df37e38ccaf6938c9f408e294110bb Change-Id: I49ee4f58db177b81b039d7d949f671c97c5a7933
2019-02-07 23:13:06 +01:00
const auto& elem = PolicyTraits::element(CommonAccess::GetSlot(node));
auto res = PolicyTraits::apply(
Export of internal Abseil changes. -- 5da9755667df37e38ccaf6938c9f408e294110bb by Shaindel Schwartz <shaindel@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 232942734 -- b6fb275769c66fdd2bd92b119198c59e9a7dd737 by Samuel Benzaquen <sbenza@google.com>: Fix integral underflow when from-arg width is INT_MIN. PiperOrigin-RevId: 232888037 -- 4135dbba4a26c4642277fc2a7e2a833d593daa1c by Abseil Team <absl-team@google.com>: Add the insert_return_type alias to raw_hash_set. PiperOrigin-RevId: 232683892 -- 0b120b7d3693800bbb886f6fc607ae54a9338cb1 by Abseil Team <absl-team@google.com>: Macros to detect and disabled SafeStack https://clang.llvm.org/docs/SafeStack.html PiperOrigin-RevId: 232680114 -- a77b3fb533a9e37966d1d6ef5ccd09c73fff2ca1 by Abseil Team <absl-team@google.com>: Avoid potential red zone clobber Pushing on the stack on x86-64 may clobber local variables held below %rsp in the red zone. Avoid this by using lea on x86-64. PiperOrigin-RevId: 232592478 -- bf326a0eefa92f4e704287563df0c5a5b1873b6d by Eric Fiselier <ericwf@google.com>: Add additional tests for AbslHashValue. PiperOrigin-RevId: 232344325 -- 816e4f98fd7632c944c779db87b7dac4e138afcf by Eric Fiselier <ericwf@google.com>: Avoid upcoming GCC 9.0 warnings about base class init. Currently, in trunk, GCC has a new warning under -Wextra that diagnoses when a derived class fails to explicitly initialize the base class in a constructor initializer list. This patch avoids this warning. PiperOrigin-RevId: 232327626 -- 779c0f44b3c2b7a04d4bdf978641eb8180515bf6 by Eric Fiselier <ericwf@google.com>: Guard against C++2a char8_t change. PiperOrigin-RevId: 232326178 -- 41e5395b85bbbfb5bf418cc21b04ad4ccb15a284 by Eric Fiselier <ericwf@google.com>: Avoid Clang Warning PiperOrigin-RevId: 232138866 GitOrigin-RevId: 5da9755667df37e38ccaf6938c9f408e294110bb Change-Id: I49ee4f58db177b81b039d7d949f671c97c5a7933
2019-02-07 23:13:06 +01:00
InsertSlot<false>{*this, std::move(*CommonAccess::GetSlot(node))},
elem);
if (res.second) {
Export of internal Abseil changes. -- 5da9755667df37e38ccaf6938c9f408e294110bb by Shaindel Schwartz <shaindel@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 232942734 -- b6fb275769c66fdd2bd92b119198c59e9a7dd737 by Samuel Benzaquen <sbenza@google.com>: Fix integral underflow when from-arg width is INT_MIN. PiperOrigin-RevId: 232888037 -- 4135dbba4a26c4642277fc2a7e2a833d593daa1c by Abseil Team <absl-team@google.com>: Add the insert_return_type alias to raw_hash_set. PiperOrigin-RevId: 232683892 -- 0b120b7d3693800bbb886f6fc607ae54a9338cb1 by Abseil Team <absl-team@google.com>: Macros to detect and disabled SafeStack https://clang.llvm.org/docs/SafeStack.html PiperOrigin-RevId: 232680114 -- a77b3fb533a9e37966d1d6ef5ccd09c73fff2ca1 by Abseil Team <absl-team@google.com>: Avoid potential red zone clobber Pushing on the stack on x86-64 may clobber local variables held below %rsp in the red zone. Avoid this by using lea on x86-64. PiperOrigin-RevId: 232592478 -- bf326a0eefa92f4e704287563df0c5a5b1873b6d by Eric Fiselier <ericwf@google.com>: Add additional tests for AbslHashValue. PiperOrigin-RevId: 232344325 -- 816e4f98fd7632c944c779db87b7dac4e138afcf by Eric Fiselier <ericwf@google.com>: Avoid upcoming GCC 9.0 warnings about base class init. Currently, in trunk, GCC has a new warning under -Wextra that diagnoses when a derived class fails to explicitly initialize the base class in a constructor initializer list. This patch avoids this warning. PiperOrigin-RevId: 232327626 -- 779c0f44b3c2b7a04d4bdf978641eb8180515bf6 by Eric Fiselier <ericwf@google.com>: Guard against C++2a char8_t change. PiperOrigin-RevId: 232326178 -- 41e5395b85bbbfb5bf418cc21b04ad4ccb15a284 by Eric Fiselier <ericwf@google.com>: Avoid Clang Warning PiperOrigin-RevId: 232138866 GitOrigin-RevId: 5da9755667df37e38ccaf6938c9f408e294110bb Change-Id: I49ee4f58db177b81b039d7d949f671c97c5a7933
2019-02-07 23:13:06 +01:00
CommonAccess::Reset(&node);
return {res.first, true, node_type()};
} else {
return {res.first, false, std::move(node)};
}
}
iterator insert(const_iterator, node_type&& node) {
return insert(std::move(node)).first;
}
// This overload kicks in if we can deduce the key from args. This enables us
// to avoid constructing value_type if an entry with the same key already
// exists.
//
// For example:
//
// flat_hash_map<std::string, std::string> m = {{"abc", "def"}};
// // Creates no std::string copies and makes no heap allocations.
// m.emplace("abc", "xyz");
template <class... Args, typename std::enable_if<
IsDecomposable<Args...>::value, int>::type = 0>
std::pair<iterator, bool> emplace(Args&&... args) {
return PolicyTraits::apply(EmplaceDecomposable{*this},
std::forward<Args>(args)...);
}
// This overload kicks in if we cannot deduce the key from args. It constructs
// value_type unconditionally and then either moves it into the table or
// destroys.
template <class... Args, typename std::enable_if<
!IsDecomposable<Args...>::value, int>::type = 0>
std::pair<iterator, bool> emplace(Args&&... args) {
typename std::aligned_storage<sizeof(slot_type), alignof(slot_type)>::type
raw;
slot_type* slot = reinterpret_cast<slot_type*>(&raw);
PolicyTraits::construct(&alloc_ref(), slot, std::forward<Args>(args)...);
const auto& elem = PolicyTraits::element(slot);
return PolicyTraits::apply(InsertSlot<true>{*this, std::move(*slot)}, elem);
}
template <class... Args>
iterator emplace_hint(const_iterator, Args&&... args) {
return emplace(std::forward<Args>(args)...).first;
}
// Extension API: support for lazy emplace.
//
// Looks up key in the table. If found, returns the iterator to the element.
// Otherwise calls f with one argument of type raw_hash_set::constructor. f
// MUST call raw_hash_set::constructor with arguments as if a
// raw_hash_set::value_type is constructed, otherwise the behavior is
// undefined.
//
// For example:
//
// std::unordered_set<ArenaString> s;
// // Makes ArenaStr even if "abc" is in the map.
// s.insert(ArenaString(&arena, "abc"));
//
// flat_hash_set<ArenaStr> s;
// // Makes ArenaStr only if "abc" is not in the map.
// s.lazy_emplace("abc", [&](const constructor& ctor) {
// ctor(&arena, "abc");
// });
//
// WARNING: This API is currently experimental. If there is a way to implement
// the same thing with the rest of the API, prefer that.
class constructor {
friend class raw_hash_set;
public:
template <class... Args>
void operator()(Args&&... args) const {
assert(*slot_);
PolicyTraits::construct(alloc_, *slot_, std::forward<Args>(args)...);
*slot_ = nullptr;
}
private:
constructor(allocator_type* a, slot_type** slot) : alloc_(a), slot_(slot) {}
allocator_type* alloc_;
slot_type** slot_;
};
template <class K = key_type, class F>
iterator lazy_emplace(const key_arg<K>& key, F&& f) {
auto res = find_or_prepare_insert(key);
if (res.second) {
slot_type* slot = slots_ + res.first;
std::forward<F>(f)(constructor(&alloc_ref(), &slot));
assert(!slot);
}
return iterator_at(res.first);
}
// Extension API: support for heterogeneous keys.
//
// std::unordered_set<std::string> s;
// // Turns "abc" into std::string.
// s.erase("abc");
//
// flat_hash_set<std::string> s;
// // Uses "abc" directly without copying it into std::string.
// s.erase("abc");
template <class K = key_type>
size_type erase(const key_arg<K>& key) {
auto it = find(key);
if (it == end()) return 0;
erase(it);
return 1;
}
// Erases the element pointed to by `it`. Unlike `std::unordered_set::erase`,
// this method returns void to reduce algorithmic complexity to O(1). In
// order to erase while iterating across a map, use the following idiom (which
// also works for standard containers):
//
// for (auto it = m.begin(), end = m.end(); it != end;) {
// if (<pred>) {
// m.erase(it++);
// } else {
// ++it;
// }
// }
void erase(const_iterator cit) { erase(cit.inner_); }
// This overload is necessary because otherwise erase<K>(const K&) would be
// a better match if non-const iterator is passed as an argument.
void erase(iterator it) {
assert(it != end());
PolicyTraits::destroy(&alloc_ref(), it.slot_);
erase_meta_only(it);
}
iterator erase(const_iterator first, const_iterator last) {
while (first != last) {
erase(first++);
}
return last.inner_;
}
// Moves elements from `src` into `this`.
// If the element already exists in `this`, it is left unmodified in `src`.
template <typename H, typename E>
void merge(raw_hash_set<Policy, H, E, Alloc>& src) { // NOLINT
assert(this != &src);
for (auto it = src.begin(), e = src.end(); it != e; ++it) {
if (PolicyTraits::apply(InsertSlot<false>{*this, std::move(*it.slot_)},
PolicyTraits::element(it.slot_))
.second) {
src.erase_meta_only(it);
}
}
}
template <typename H, typename E>
void merge(raw_hash_set<Policy, H, E, Alloc>&& src) {
merge(src);
}
node_type extract(const_iterator position) {
Export of internal Abseil changes. -- 5da9755667df37e38ccaf6938c9f408e294110bb by Shaindel Schwartz <shaindel@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 232942734 -- b6fb275769c66fdd2bd92b119198c59e9a7dd737 by Samuel Benzaquen <sbenza@google.com>: Fix integral underflow when from-arg width is INT_MIN. PiperOrigin-RevId: 232888037 -- 4135dbba4a26c4642277fc2a7e2a833d593daa1c by Abseil Team <absl-team@google.com>: Add the insert_return_type alias to raw_hash_set. PiperOrigin-RevId: 232683892 -- 0b120b7d3693800bbb886f6fc607ae54a9338cb1 by Abseil Team <absl-team@google.com>: Macros to detect and disabled SafeStack https://clang.llvm.org/docs/SafeStack.html PiperOrigin-RevId: 232680114 -- a77b3fb533a9e37966d1d6ef5ccd09c73fff2ca1 by Abseil Team <absl-team@google.com>: Avoid potential red zone clobber Pushing on the stack on x86-64 may clobber local variables held below %rsp in the red zone. Avoid this by using lea on x86-64. PiperOrigin-RevId: 232592478 -- bf326a0eefa92f4e704287563df0c5a5b1873b6d by Eric Fiselier <ericwf@google.com>: Add additional tests for AbslHashValue. PiperOrigin-RevId: 232344325 -- 816e4f98fd7632c944c779db87b7dac4e138afcf by Eric Fiselier <ericwf@google.com>: Avoid upcoming GCC 9.0 warnings about base class init. Currently, in trunk, GCC has a new warning under -Wextra that diagnoses when a derived class fails to explicitly initialize the base class in a constructor initializer list. This patch avoids this warning. PiperOrigin-RevId: 232327626 -- 779c0f44b3c2b7a04d4bdf978641eb8180515bf6 by Eric Fiselier <ericwf@google.com>: Guard against C++2a char8_t change. PiperOrigin-RevId: 232326178 -- 41e5395b85bbbfb5bf418cc21b04ad4ccb15a284 by Eric Fiselier <ericwf@google.com>: Avoid Clang Warning PiperOrigin-RevId: 232138866 GitOrigin-RevId: 5da9755667df37e38ccaf6938c9f408e294110bb Change-Id: I49ee4f58db177b81b039d7d949f671c97c5a7933
2019-02-07 23:13:06 +01:00
auto node =
CommonAccess::Make<node_type>(alloc_ref(), position.inner_.slot_);
erase_meta_only(position);
return node;
}
template <
class K = key_type,
typename std::enable_if<!std::is_same<K, iterator>::value, int>::type = 0>
node_type extract(const key_arg<K>& key) {
auto it = find(key);
return it == end() ? node_type() : extract(const_iterator{it});
}
void swap(raw_hash_set& that) noexcept(
IsNoThrowSwappable<hasher>() && IsNoThrowSwappable<key_equal>() &&
(!AllocTraits::propagate_on_container_swap::value ||
IsNoThrowSwappable<allocator_type>())) {
using std::swap;
swap(ctrl_, that.ctrl_);
swap(slots_, that.slots_);
swap(size_, that.size_);
swap(capacity_, that.capacity_);
swap(growth_left(), that.growth_left());
swap(hash_ref(), that.hash_ref());
swap(eq_ref(), that.eq_ref());
Export of internal Abseil changes. -- 7fa1107161a03dac53fb84c2b06d8092616c7b13 by Abseil Team <absl-team@google.com>: Harden the generic stacktrace implementation for use during early program execution PiperOrigin-RevId: 226375950 -- 079f9969329f5eb66f647dd3c44b17541b1bf217 by Matt Kulukundis <kfm@google.com>: Workaround platforms that have over-aggressive warnings on -Wexit-time-destructors PiperOrigin-RevId: 226362948 -- 1447943f509be681ca5495add0162c750ef237f1 by Matt Kulukundis <kfm@google.com>: Switch from 64 to size_t atomics so they work on embedded platforms that do not have 64 bit atomics. PiperOrigin-RevId: 226210704 -- d14d49837ae2bcde74051e0c79c18ee0f43866b9 by Tom Manshreck <shreck@google.com>: Develop initial documentation for API breaking changes process: PiperOrigin-RevId: 226210021 -- 7ea3d7fe0e86979dab83a5fc9cc3bf1d6cb3bd53 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 226195522 -- 7de873e880d7f016a4fa1e08d626f0535cc470af by Abseil Team <absl-team@google.com>: Make Abseil LICENSE files newline terminated, with a single trailing blank line. Also remove line-ending whitespace. PiperOrigin-RevId: 226182949 -- 7d00643fadfad7f0d992c68bd9d2ed2e5bc960b0 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226045282 -- c4a0a11c0ce2875271191e477f3d36eaaeca4613 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226038273 -- 8ee4ebbb1ae5cda119e436e5ff7e3aa966608c10 by Matt Kulukundis <kfm@google.com>: Adds a global sampler which tracks a fraction of live tables for collecting telemetry data. PiperOrigin-RevId: 226032080 -- d576446f050518cd1b0ae447d682d8552f0e7e30 by Mark Barolak <mbar@google.com>: Replace an internal CaseEqual function with calls to the identical absl::EqualsIgnoreCase. This closes out a rather old TODO. PiperOrigin-RevId: 226024779 -- 6b23f1ee028a5ffa608c920424f1220a117a8f3d by Abseil Team <absl-team@google.com>: Add December 2018 LTS branch to list of LTS branches. PiperOrigin-RevId: 226011333 -- bb0833a43bdaef4c8c059b17bcd27ba9a085a114 by Mark Barolak <mbar@google.com>: Explicitly state that when the SimpleAtoi family of functions encounter an error, the value of their output parameter is unspecified. Also standardize the name of the output parameter to be `out`. PiperOrigin-RevId: 225997035 -- 46c1876b1a248eabda7545daa61a74a4cdfe9077 by Abseil Team <absl-team@google.com>: Remove deprecated CMake function absl_test, absl_library and absl_header_library PiperOrigin-RevId: 225950041 GitOrigin-RevId: 7fa1107161a03dac53fb84c2b06d8092616c7b13 Change-Id: I2ca9d3aada9292614527d1339a7557494139b806
2018-12-20 21:29:59 +01:00
swap(infoz_, that.infoz_);
if (AllocTraits::propagate_on_container_swap::value) {
swap(alloc_ref(), that.alloc_ref());
} else {
// If the allocators do not compare equal it is officially undefined
// behavior. We choose to do nothing.
}
}
void rehash(size_t n) {
if (n == 0 && capacity_ == 0) return;
Export of internal Abseil changes. -- 7fa1107161a03dac53fb84c2b06d8092616c7b13 by Abseil Team <absl-team@google.com>: Harden the generic stacktrace implementation for use during early program execution PiperOrigin-RevId: 226375950 -- 079f9969329f5eb66f647dd3c44b17541b1bf217 by Matt Kulukundis <kfm@google.com>: Workaround platforms that have over-aggressive warnings on -Wexit-time-destructors PiperOrigin-RevId: 226362948 -- 1447943f509be681ca5495add0162c750ef237f1 by Matt Kulukundis <kfm@google.com>: Switch from 64 to size_t atomics so they work on embedded platforms that do not have 64 bit atomics. PiperOrigin-RevId: 226210704 -- d14d49837ae2bcde74051e0c79c18ee0f43866b9 by Tom Manshreck <shreck@google.com>: Develop initial documentation for API breaking changes process: PiperOrigin-RevId: 226210021 -- 7ea3d7fe0e86979dab83a5fc9cc3bf1d6cb3bd53 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 226195522 -- 7de873e880d7f016a4fa1e08d626f0535cc470af by Abseil Team <absl-team@google.com>: Make Abseil LICENSE files newline terminated, with a single trailing blank line. Also remove line-ending whitespace. PiperOrigin-RevId: 226182949 -- 7d00643fadfad7f0d992c68bd9d2ed2e5bc960b0 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226045282 -- c4a0a11c0ce2875271191e477f3d36eaaeca4613 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226038273 -- 8ee4ebbb1ae5cda119e436e5ff7e3aa966608c10 by Matt Kulukundis <kfm@google.com>: Adds a global sampler which tracks a fraction of live tables for collecting telemetry data. PiperOrigin-RevId: 226032080 -- d576446f050518cd1b0ae447d682d8552f0e7e30 by Mark Barolak <mbar@google.com>: Replace an internal CaseEqual function with calls to the identical absl::EqualsIgnoreCase. This closes out a rather old TODO. PiperOrigin-RevId: 226024779 -- 6b23f1ee028a5ffa608c920424f1220a117a8f3d by Abseil Team <absl-team@google.com>: Add December 2018 LTS branch to list of LTS branches. PiperOrigin-RevId: 226011333 -- bb0833a43bdaef4c8c059b17bcd27ba9a085a114 by Mark Barolak <mbar@google.com>: Explicitly state that when the SimpleAtoi family of functions encounter an error, the value of their output parameter is unspecified. Also standardize the name of the output parameter to be `out`. PiperOrigin-RevId: 225997035 -- 46c1876b1a248eabda7545daa61a74a4cdfe9077 by Abseil Team <absl-team@google.com>: Remove deprecated CMake function absl_test, absl_library and absl_header_library PiperOrigin-RevId: 225950041 GitOrigin-RevId: 7fa1107161a03dac53fb84c2b06d8092616c7b13 Change-Id: I2ca9d3aada9292614527d1339a7557494139b806
2018-12-20 21:29:59 +01:00
if (n == 0 && size_ == 0) {
destroy_slots();
Export of internal Abseil changes. -- 3d20ce6cd6541579abecaba169d4b8716d511272 by Jon Cohen <cohenjon@google.com>: Only use LSAN for clang version >= 3.5. This should fix https://github.com/abseil/abseil-cpp/issues/244 PiperOrigin-RevId: 234675129 -- e15bd4ec7a81aa95cc3d09fa1e0e81d58ae478fb by Conrad Parker <conradparker@google.com>: Fix errors in apply() sample code The following changes are made: * Make the example method public. * Give the two user functions different names to avoid confusion about whether apply() can select the correct overload of a function based on its tuple argument (it can't). * Pass tuple2 to the second example apply() invocation, instead of passing its contents individually. * Fix a s/tuple/tuple3/ typo in the third example apply() invocation. PiperOrigin-RevId: 234223407 -- de0ed71e21bc76ddf9fe715fdbaef74cd0df95c7 by Abseil Team <absl-team@google.com>: First test if a macro is defined to avoid -Wundef. ABSL clients may need to compile their code with the -Wundef warning flag. It will be helpful if ABSL header files can be compiled without the -Wundef warning. How to avoid the -Wundef warning: If a macro may be undefined, we need to first test whether the macro is defined before testing its value. We can't rely on the C preprocessor rule that an undefined macro has the value 0L. PiperOrigin-RevId: 234201123 -- fa484ad7dae0cac21140a96662809ecb0ec8eb5d by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 234185697 -- d69b1baef681e27954b065375ecf9c2320463b2b by Samuel Benzaquen <sbenza@google.com>: Mix pointers more thoroughly. Some pointer alignments interact badly with the mixing constant. By mixing twice we reduce this problem. PiperOrigin-RevId: 234178401 -- 1041d0e474610f3a8fea0db90958857327d6da1c by Samuel Benzaquen <sbenza@google.com>: Record rehashes in the hashtablez struct. Only recording the probe length on insertion causes a huge overestimation of the total probe length at any given time. With natural growth, elements are inserted when the load factor is between (max load/2, max load). However, after a rehash the majority of elements are actually inserted when the load factor is less than max/2 and have a much lower average probe length. Also reset some values when the table is cleared. PiperOrigin-RevId: 234013580 -- 299205caf3c89c47339f7409bc831746602cea84 by Mark Barolak <mbar@google.com>: Fix a sample code snippet that assumes `absl::string_view::const_iterator` is `const char*`. This is generally true, however in C++17 builds, absl::string_view is an alias for std::string_view and on MSVC, the std::string_view::const_iterator is an object instead of just a pointer. PiperOrigin-RevId: 233844595 -- af6c6370cf51a1e6c1469c79dfb2a486a4009136 by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 233773470 -- 6e59e4b8e2bb6101b448f0f32b0bea81fe399ccf by Abseil Team <absl-team@google.com>: fix typo in {Starts|Ends}WithIgnoreCase comment in match.h PiperOrigin-RevId: 233662951 GitOrigin-RevId: 3d20ce6cd6541579abecaba169d4b8716d511272 Change-Id: Ib9a29b1c38c6aedf5d9f3f7f00596e8d30e864dd
2019-02-19 23:29:09 +01:00
infoz_.RecordStorageChanged(0, 0);
Export of internal Abseil changes. -- 7fa1107161a03dac53fb84c2b06d8092616c7b13 by Abseil Team <absl-team@google.com>: Harden the generic stacktrace implementation for use during early program execution PiperOrigin-RevId: 226375950 -- 079f9969329f5eb66f647dd3c44b17541b1bf217 by Matt Kulukundis <kfm@google.com>: Workaround platforms that have over-aggressive warnings on -Wexit-time-destructors PiperOrigin-RevId: 226362948 -- 1447943f509be681ca5495add0162c750ef237f1 by Matt Kulukundis <kfm@google.com>: Switch from 64 to size_t atomics so they work on embedded platforms that do not have 64 bit atomics. PiperOrigin-RevId: 226210704 -- d14d49837ae2bcde74051e0c79c18ee0f43866b9 by Tom Manshreck <shreck@google.com>: Develop initial documentation for API breaking changes process: PiperOrigin-RevId: 226210021 -- 7ea3d7fe0e86979dab83a5fc9cc3bf1d6cb3bd53 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 226195522 -- 7de873e880d7f016a4fa1e08d626f0535cc470af by Abseil Team <absl-team@google.com>: Make Abseil LICENSE files newline terminated, with a single trailing blank line. Also remove line-ending whitespace. PiperOrigin-RevId: 226182949 -- 7d00643fadfad7f0d992c68bd9d2ed2e5bc960b0 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226045282 -- c4a0a11c0ce2875271191e477f3d36eaaeca4613 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226038273 -- 8ee4ebbb1ae5cda119e436e5ff7e3aa966608c10 by Matt Kulukundis <kfm@google.com>: Adds a global sampler which tracks a fraction of live tables for collecting telemetry data. PiperOrigin-RevId: 226032080 -- d576446f050518cd1b0ae447d682d8552f0e7e30 by Mark Barolak <mbar@google.com>: Replace an internal CaseEqual function with calls to the identical absl::EqualsIgnoreCase. This closes out a rather old TODO. PiperOrigin-RevId: 226024779 -- 6b23f1ee028a5ffa608c920424f1220a117a8f3d by Abseil Team <absl-team@google.com>: Add December 2018 LTS branch to list of LTS branches. PiperOrigin-RevId: 226011333 -- bb0833a43bdaef4c8c059b17bcd27ba9a085a114 by Mark Barolak <mbar@google.com>: Explicitly state that when the SimpleAtoi family of functions encounter an error, the value of their output parameter is unspecified. Also standardize the name of the output parameter to be `out`. PiperOrigin-RevId: 225997035 -- 46c1876b1a248eabda7545daa61a74a4cdfe9077 by Abseil Team <absl-team@google.com>: Remove deprecated CMake function absl_test, absl_library and absl_header_library PiperOrigin-RevId: 225950041 GitOrigin-RevId: 7fa1107161a03dac53fb84c2b06d8092616c7b13 Change-Id: I2ca9d3aada9292614527d1339a7557494139b806
2018-12-20 21:29:59 +01:00
return;
}
// bitor is a faster way of doing `max` here. We will round up to the next
// power-of-2-minus-1, so bitor is good enough.
auto m = NormalizeCapacity(n | GrowthToLowerboundCapacity(size()));
// n == 0 unconditionally rehashes as per the standard.
if (n == 0 || m > capacity_) {
resize(m);
}
}
void reserve(size_t n) { rehash(GrowthToLowerboundCapacity(n)); }
// Extension API: support for heterogeneous keys.
//
// std::unordered_set<std::string> s;
// // Turns "abc" into std::string.
// s.count("abc");
//
// ch_set<std::string> s;
// // Uses "abc" directly without copying it into std::string.
// s.count("abc");
template <class K = key_type>
size_t count(const key_arg<K>& key) const {
return find(key) == end() ? 0 : 1;
}
// Issues CPU prefetch instructions for the memory needed to find or insert
// a key. Like all lookup functions, this support heterogeneous keys.
//
// NOTE: This is a very low level operation and should not be used without
// specific benchmarks indicating its importance.
template <class K = key_type>
void prefetch(const key_arg<K>& key) const {
(void)key;
#if defined(__GNUC__)
auto seq = probe(hash_ref()(key));
__builtin_prefetch(static_cast<const void*>(ctrl_ + seq.offset()));
__builtin_prefetch(static_cast<const void*>(slots_ + seq.offset()));
#endif // __GNUC__
}
// The API of find() has two extensions.
//
// 1. The hash can be passed by the user. It must be equal to the hash of the
// key.
//
// 2. The type of the key argument doesn't have to be key_type. This is so
// called heterogeneous key support.
template <class K = key_type>
iterator find(const key_arg<K>& key, size_t hash) {
auto seq = probe(hash);
while (true) {
Group g{ctrl_ + seq.offset()};
for (int i : g.Match(H2(hash))) {
if (ABSL_PREDICT_TRUE(PolicyTraits::apply(
EqualElement<K>{key, eq_ref()},
PolicyTraits::element(slots_ + seq.offset(i)))))
return iterator_at(seq.offset(i));
}
if (ABSL_PREDICT_TRUE(g.MatchEmpty())) return end();
seq.next();
}
}
template <class K = key_type>
iterator find(const key_arg<K>& key) {
return find(key, hash_ref()(key));
}
template <class K = key_type>
const_iterator find(const key_arg<K>& key, size_t hash) const {
return const_cast<raw_hash_set*>(this)->find(key, hash);
}
template <class K = key_type>
const_iterator find(const key_arg<K>& key) const {
return find(key, hash_ref()(key));
}
template <class K = key_type>
bool contains(const key_arg<K>& key) const {
return find(key) != end();
}
template <class K = key_type>
std::pair<iterator, iterator> equal_range(const key_arg<K>& key) {
auto it = find(key);
if (it != end()) return {it, std::next(it)};
return {it, it};
}
template <class K = key_type>
std::pair<const_iterator, const_iterator> equal_range(
const key_arg<K>& key) const {
auto it = find(key);
if (it != end()) return {it, std::next(it)};
return {it, it};
}
size_t bucket_count() const { return capacity_; }
float load_factor() const {
return capacity_ ? static_cast<double>(size()) / capacity_ : 0.0;
}
float max_load_factor() const { return 1.0f; }
void max_load_factor(float) {
// Does nothing.
}
hasher hash_function() const { return hash_ref(); }
key_equal key_eq() const { return eq_ref(); }
allocator_type get_allocator() const { return alloc_ref(); }
friend bool operator==(const raw_hash_set& a, const raw_hash_set& b) {
if (a.size() != b.size()) return false;
const raw_hash_set* outer = &a;
const raw_hash_set* inner = &b;
if (outer->capacity() > inner->capacity()) std::swap(outer, inner);
for (const value_type& elem : *outer)
if (!inner->has_element(elem)) return false;
return true;
}
friend bool operator!=(const raw_hash_set& a, const raw_hash_set& b) {
return !(a == b);
}
friend void swap(raw_hash_set& a,
raw_hash_set& b) noexcept(noexcept(a.swap(b))) {
a.swap(b);
}
private:
template <class Container, typename Enabler>
friend struct absl::container_internal::hashtable_debug_internal::
HashtableDebugAccess;
struct FindElement {
template <class K, class... Args>
const_iterator operator()(const K& key, Args&&...) const {
return s.find(key);
}
const raw_hash_set& s;
};
struct HashElement {
template <class K, class... Args>
size_t operator()(const K& key, Args&&...) const {
return h(key);
}
const hasher& h;
};
template <class K1>
struct EqualElement {
template <class K2, class... Args>
bool operator()(const K2& lhs, Args&&...) const {
return eq(lhs, rhs);
}
const K1& rhs;
const key_equal& eq;
};
struct EmplaceDecomposable {
template <class K, class... Args>
std::pair<iterator, bool> operator()(const K& key, Args&&... args) const {
auto res = s.find_or_prepare_insert(key);
if (res.second) {
s.emplace_at(res.first, std::forward<Args>(args)...);
}
return {s.iterator_at(res.first), res.second};
}
raw_hash_set& s;
};
template <bool do_destroy>
struct InsertSlot {
template <class K, class... Args>
std::pair<iterator, bool> operator()(const K& key, Args&&...) && {
auto res = s.find_or_prepare_insert(key);
if (res.second) {
PolicyTraits::transfer(&s.alloc_ref(), s.slots_ + res.first, &slot);
} else if (do_destroy) {
PolicyTraits::destroy(&s.alloc_ref(), &slot);
}
return {s.iterator_at(res.first), res.second};
}
raw_hash_set& s;
// Constructed slot. Either moved into place or destroyed.
slot_type&& slot;
};
// "erases" the object from the container, except that it doesn't actually
// destroy the object. It only updates all the metadata of the class.
// This can be used in conjunction with Policy::transfer to move the object to
// another place.
void erase_meta_only(const_iterator it) {
assert(IsFull(*it.inner_.ctrl_) && "erasing a dangling iterator");
--size_;
const size_t index = it.inner_.ctrl_ - ctrl_;
const size_t index_before = (index - Group::kWidth) & capacity_;
const auto empty_after = Group(it.inner_.ctrl_).MatchEmpty();
const auto empty_before = Group(ctrl_ + index_before).MatchEmpty();
// We count how many consecutive non empties we have to the right and to the
// left of `it`. If the sum is >= kWidth then there is at least one probe
// window that might have seen a full group.
bool was_never_full =
empty_before && empty_after &&
static_cast<size_t>(empty_after.TrailingZeros() +
empty_before.LeadingZeros()) < Group::kWidth;
set_ctrl(index, was_never_full ? kEmpty : kDeleted);
growth_left() += was_never_full;
Export of internal Abseil changes. -- 7fa1107161a03dac53fb84c2b06d8092616c7b13 by Abseil Team <absl-team@google.com>: Harden the generic stacktrace implementation for use during early program execution PiperOrigin-RevId: 226375950 -- 079f9969329f5eb66f647dd3c44b17541b1bf217 by Matt Kulukundis <kfm@google.com>: Workaround platforms that have over-aggressive warnings on -Wexit-time-destructors PiperOrigin-RevId: 226362948 -- 1447943f509be681ca5495add0162c750ef237f1 by Matt Kulukundis <kfm@google.com>: Switch from 64 to size_t atomics so they work on embedded platforms that do not have 64 bit atomics. PiperOrigin-RevId: 226210704 -- d14d49837ae2bcde74051e0c79c18ee0f43866b9 by Tom Manshreck <shreck@google.com>: Develop initial documentation for API breaking changes process: PiperOrigin-RevId: 226210021 -- 7ea3d7fe0e86979dab83a5fc9cc3bf1d6cb3bd53 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 226195522 -- 7de873e880d7f016a4fa1e08d626f0535cc470af by Abseil Team <absl-team@google.com>: Make Abseil LICENSE files newline terminated, with a single trailing blank line. Also remove line-ending whitespace. PiperOrigin-RevId: 226182949 -- 7d00643fadfad7f0d992c68bd9d2ed2e5bc960b0 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226045282 -- c4a0a11c0ce2875271191e477f3d36eaaeca4613 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226038273 -- 8ee4ebbb1ae5cda119e436e5ff7e3aa966608c10 by Matt Kulukundis <kfm@google.com>: Adds a global sampler which tracks a fraction of live tables for collecting telemetry data. PiperOrigin-RevId: 226032080 -- d576446f050518cd1b0ae447d682d8552f0e7e30 by Mark Barolak <mbar@google.com>: Replace an internal CaseEqual function with calls to the identical absl::EqualsIgnoreCase. This closes out a rather old TODO. PiperOrigin-RevId: 226024779 -- 6b23f1ee028a5ffa608c920424f1220a117a8f3d by Abseil Team <absl-team@google.com>: Add December 2018 LTS branch to list of LTS branches. PiperOrigin-RevId: 226011333 -- bb0833a43bdaef4c8c059b17bcd27ba9a085a114 by Mark Barolak <mbar@google.com>: Explicitly state that when the SimpleAtoi family of functions encounter an error, the value of their output parameter is unspecified. Also standardize the name of the output parameter to be `out`. PiperOrigin-RevId: 225997035 -- 46c1876b1a248eabda7545daa61a74a4cdfe9077 by Abseil Team <absl-team@google.com>: Remove deprecated CMake function absl_test, absl_library and absl_header_library PiperOrigin-RevId: 225950041 GitOrigin-RevId: 7fa1107161a03dac53fb84c2b06d8092616c7b13 Change-Id: I2ca9d3aada9292614527d1339a7557494139b806
2018-12-20 21:29:59 +01:00
infoz_.RecordErase();
}
void initialize_slots() {
assert(capacity_);
Export of internal Abseil changes. -- 5a5dba4252e764e6737070bf0a31074bf23a3b41 by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 244898913 -- 3eb7d5b445ffbf08a104e39cd15aecf568417333 by Matt Calabrese <calabrese@google.com>: Introduce absl::is_trivially_move_constructible and absl::is_trivially_move_assignable, and update the absl::is_trivially_copy_constructible and absl::is_trivially_copy_assignable traits to use similar techniques (should now be closer to the standard behavior). PiperOrigin-RevId: 244859015 -- 7da05a24fa786cab3985de0c39a186d73dcbcfb5 by Abseil Team <absl-team@google.com>: Fix misspellings in comments in raw_hash_set.h. PiperOrigin-RevId: 244754700 -- 5c057be96048f21473d5ec45005ab4dcd8dd354f by Derek Mauro <dmauro@google.com>: Internal change PiperOrigin-RevId: 244744239 -- 592394e3c2e98f1238d3fb6fcb0d20c3e3739ba9 by Derek Mauro <dmauro@google.com>: Limit the raw_hash_set prefetch test to x86-64. PiperOrigin-RevId: 244737534 -- 99ebe4e003633c8ff7838b035b31a827994879ef by Derek Mauro <dmauro@google.com>: Workaround warning 4091 in an MSVC header. PiperOrigin-RevId: 244701744 -- 0aa23f09a32efe7985ee55b0217190f08da42477 by Abseil Team <absl-team@google.com>: Fix comment typo. PiperOrigin-RevId: 244659371 -- c6cdb87e9f28062c8daa29b3d8d68182ecc16383 by Derek Mauro <dmauro@google.com>: Fix -Wundef warnings and support -Wundef. PiperOrigin-RevId: 244244968 -- 06b81245f7696b20c3c63b0618d33ac25e29cad6 by Abseil Team <absl-team@google.com>: Fix a typo in inlined_vector.h. PiperOrigin-RevId: 244230809 -- 94877a2125d2cfe837384240e4d6551f39d737e4 by Greg Falcon <gfalcon@google.com>: Fix sysinfo_test for emscripten. PiperOrigin-RevId: 244198804 -- ec7783531ef7f9df2da37d341d61f7cb2bf843f0 by Shaindel Schwartz <shaindel@google.com>: Import of CCTZ from GitHub. Fixes #291. PiperOrigin-RevId: 244184598 -- b652c14fa95ea206c217487ee713b11f5d1762b3 by Matt Calabrese <calabrese@google.com>: Emulate the `in_place_index` and `in_place_type` variable templates such that they are syntactically usable in C++11 with `any` and `variant`. Also pull in the variable templates from namespace std when available. The main observable differences here are: 1) The types of `in_place_index_t<I>` and `in_place_type_t<T>` become function pointer types rather than structs when using the implementation that is not an alias of the std equivalents. 2) The types of `in_place_index<I>` and `in_place_type<T>` are not directly `in_place_index_t<I>` and `in_place_type_t<T>`, but rather they become function types that decay to the corresponding function pointer types. 3) The default constructor for `in_place_index_t` and `in_place_type_t` instantiations is no longer explicit, but for these templates I think that's less important than for something like `in_place_t` since the _type_t and _index_t versions basically never have their template parameter non-deduced when participating in overload resolution with conflicting candidates. 4) While idiomatic usage of `in_place_type_t` and `in_place_index_t` with std::variant and std::any should not be affected, there is the possibility that strange, non-idiomatic uses may be affected in the wild. 5) Default construction (rather than value-initialization) leads to a default-constructed pointer. PiperOrigin-RevId: 244180003 -- b9ac5a96581837ffa24532117b7ea302a5569751 by Derek Mauro <dmauro@google.com>: Fix MSVC debug assertion. isprint is undefined for values not representable as unsigned char or EOF. PiperOrigin-RevId: 244083005 -- 41758be6137c2f25e84b50f23938e49484be2903 by Shaindel Schwartz <shaindel@google.com>: Update config settings for Apple platforms. PiperOrigin-RevId: 244040587 -- c90df6a26db94b0305a0c954455a621542a89d91 by Abseil Team <absl-team@google.com>: Internal change PiperOrigin-RevId: 244024427 -- c71e9ceb89495354eca7d02bd905ffeaa9029aec by Derek Mauro <dmauro@google.com>: Adds missing ABSL_DEFAULT_COPTS and ABSL_TEST_COPTS to CMakeLists.txt Don't error on deprecated declarations in tests. It is completely reasonable to test that code marked deprecated still works. PiperOrigin-RevId: 244003941 -- e1326a96527a8ba9b8d120161545260da9c4562e by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 243990623 -- 90b8e12934c7711e1bfcc0117d21288bf9220dee by Abseil Team <absl-team@google.com>: Add variation of absl::Base64Escape/WebSafeBase64Escape that directly returns its result. PiperOrigin-RevId: 243894308 -- 317fef3344481ebc5c35712d42f5d8a0fa64dff4 by Abseil Team <absl-team@google.com>: Enable raw logging in Emscripten builds. PiperOrigin-RevId: 243893705 GitOrigin-RevId: 5a5dba4252e764e6737070bf0a31074bf23a3b41 Change-Id: I19293aab73cc98d9e9bf6a9fdc30819764adb9db
2019-04-23 21:04:13 +02:00
// Folks with custom allocators often make unwarranted assumptions about the
// behavior of their classes vis-a-vis trivial destructability and what
// calls they will or wont make. Avoid sampling for people with custom
Export of internal Abseil changes. -- 5a5dba4252e764e6737070bf0a31074bf23a3b41 by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 244898913 -- 3eb7d5b445ffbf08a104e39cd15aecf568417333 by Matt Calabrese <calabrese@google.com>: Introduce absl::is_trivially_move_constructible and absl::is_trivially_move_assignable, and update the absl::is_trivially_copy_constructible and absl::is_trivially_copy_assignable traits to use similar techniques (should now be closer to the standard behavior). PiperOrigin-RevId: 244859015 -- 7da05a24fa786cab3985de0c39a186d73dcbcfb5 by Abseil Team <absl-team@google.com>: Fix misspellings in comments in raw_hash_set.h. PiperOrigin-RevId: 244754700 -- 5c057be96048f21473d5ec45005ab4dcd8dd354f by Derek Mauro <dmauro@google.com>: Internal change PiperOrigin-RevId: 244744239 -- 592394e3c2e98f1238d3fb6fcb0d20c3e3739ba9 by Derek Mauro <dmauro@google.com>: Limit the raw_hash_set prefetch test to x86-64. PiperOrigin-RevId: 244737534 -- 99ebe4e003633c8ff7838b035b31a827994879ef by Derek Mauro <dmauro@google.com>: Workaround warning 4091 in an MSVC header. PiperOrigin-RevId: 244701744 -- 0aa23f09a32efe7985ee55b0217190f08da42477 by Abseil Team <absl-team@google.com>: Fix comment typo. PiperOrigin-RevId: 244659371 -- c6cdb87e9f28062c8daa29b3d8d68182ecc16383 by Derek Mauro <dmauro@google.com>: Fix -Wundef warnings and support -Wundef. PiperOrigin-RevId: 244244968 -- 06b81245f7696b20c3c63b0618d33ac25e29cad6 by Abseil Team <absl-team@google.com>: Fix a typo in inlined_vector.h. PiperOrigin-RevId: 244230809 -- 94877a2125d2cfe837384240e4d6551f39d737e4 by Greg Falcon <gfalcon@google.com>: Fix sysinfo_test for emscripten. PiperOrigin-RevId: 244198804 -- ec7783531ef7f9df2da37d341d61f7cb2bf843f0 by Shaindel Schwartz <shaindel@google.com>: Import of CCTZ from GitHub. Fixes #291. PiperOrigin-RevId: 244184598 -- b652c14fa95ea206c217487ee713b11f5d1762b3 by Matt Calabrese <calabrese@google.com>: Emulate the `in_place_index` and `in_place_type` variable templates such that they are syntactically usable in C++11 with `any` and `variant`. Also pull in the variable templates from namespace std when available. The main observable differences here are: 1) The types of `in_place_index_t<I>` and `in_place_type_t<T>` become function pointer types rather than structs when using the implementation that is not an alias of the std equivalents. 2) The types of `in_place_index<I>` and `in_place_type<T>` are not directly `in_place_index_t<I>` and `in_place_type_t<T>`, but rather they become function types that decay to the corresponding function pointer types. 3) The default constructor for `in_place_index_t` and `in_place_type_t` instantiations is no longer explicit, but for these templates I think that's less important than for something like `in_place_t` since the _type_t and _index_t versions basically never have their template parameter non-deduced when participating in overload resolution with conflicting candidates. 4) While idiomatic usage of `in_place_type_t` and `in_place_index_t` with std::variant and std::any should not be affected, there is the possibility that strange, non-idiomatic uses may be affected in the wild. 5) Default construction (rather than value-initialization) leads to a default-constructed pointer. PiperOrigin-RevId: 244180003 -- b9ac5a96581837ffa24532117b7ea302a5569751 by Derek Mauro <dmauro@google.com>: Fix MSVC debug assertion. isprint is undefined for values not representable as unsigned char or EOF. PiperOrigin-RevId: 244083005 -- 41758be6137c2f25e84b50f23938e49484be2903 by Shaindel Schwartz <shaindel@google.com>: Update config settings for Apple platforms. PiperOrigin-RevId: 244040587 -- c90df6a26db94b0305a0c954455a621542a89d91 by Abseil Team <absl-team@google.com>: Internal change PiperOrigin-RevId: 244024427 -- c71e9ceb89495354eca7d02bd905ffeaa9029aec by Derek Mauro <dmauro@google.com>: Adds missing ABSL_DEFAULT_COPTS and ABSL_TEST_COPTS to CMakeLists.txt Don't error on deprecated declarations in tests. It is completely reasonable to test that code marked deprecated still works. PiperOrigin-RevId: 244003941 -- e1326a96527a8ba9b8d120161545260da9c4562e by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 243990623 -- 90b8e12934c7711e1bfcc0117d21288bf9220dee by Abseil Team <absl-team@google.com>: Add variation of absl::Base64Escape/WebSafeBase64Escape that directly returns its result. PiperOrigin-RevId: 243894308 -- 317fef3344481ebc5c35712d42f5d8a0fa64dff4 by Abseil Team <absl-team@google.com>: Enable raw logging in Emscripten builds. PiperOrigin-RevId: 243893705 GitOrigin-RevId: 5a5dba4252e764e6737070bf0a31074bf23a3b41 Change-Id: I19293aab73cc98d9e9bf6a9fdc30819764adb9db
2019-04-23 21:04:13 +02:00
// allocators to get us out of this mess. This is not a hard guarantee but
// a workaround while we plan the exact guarantee we want to provide.
//
// People are often sloppy with the exact type of their allocator (sometimes
// it has an extra const or is missing the pair, but rebinds made it work
Export of internal Abseil changes. -- 5a5dba4252e764e6737070bf0a31074bf23a3b41 by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 244898913 -- 3eb7d5b445ffbf08a104e39cd15aecf568417333 by Matt Calabrese <calabrese@google.com>: Introduce absl::is_trivially_move_constructible and absl::is_trivially_move_assignable, and update the absl::is_trivially_copy_constructible and absl::is_trivially_copy_assignable traits to use similar techniques (should now be closer to the standard behavior). PiperOrigin-RevId: 244859015 -- 7da05a24fa786cab3985de0c39a186d73dcbcfb5 by Abseil Team <absl-team@google.com>: Fix misspellings in comments in raw_hash_set.h. PiperOrigin-RevId: 244754700 -- 5c057be96048f21473d5ec45005ab4dcd8dd354f by Derek Mauro <dmauro@google.com>: Internal change PiperOrigin-RevId: 244744239 -- 592394e3c2e98f1238d3fb6fcb0d20c3e3739ba9 by Derek Mauro <dmauro@google.com>: Limit the raw_hash_set prefetch test to x86-64. PiperOrigin-RevId: 244737534 -- 99ebe4e003633c8ff7838b035b31a827994879ef by Derek Mauro <dmauro@google.com>: Workaround warning 4091 in an MSVC header. PiperOrigin-RevId: 244701744 -- 0aa23f09a32efe7985ee55b0217190f08da42477 by Abseil Team <absl-team@google.com>: Fix comment typo. PiperOrigin-RevId: 244659371 -- c6cdb87e9f28062c8daa29b3d8d68182ecc16383 by Derek Mauro <dmauro@google.com>: Fix -Wundef warnings and support -Wundef. PiperOrigin-RevId: 244244968 -- 06b81245f7696b20c3c63b0618d33ac25e29cad6 by Abseil Team <absl-team@google.com>: Fix a typo in inlined_vector.h. PiperOrigin-RevId: 244230809 -- 94877a2125d2cfe837384240e4d6551f39d737e4 by Greg Falcon <gfalcon@google.com>: Fix sysinfo_test for emscripten. PiperOrigin-RevId: 244198804 -- ec7783531ef7f9df2da37d341d61f7cb2bf843f0 by Shaindel Schwartz <shaindel@google.com>: Import of CCTZ from GitHub. Fixes #291. PiperOrigin-RevId: 244184598 -- b652c14fa95ea206c217487ee713b11f5d1762b3 by Matt Calabrese <calabrese@google.com>: Emulate the `in_place_index` and `in_place_type` variable templates such that they are syntactically usable in C++11 with `any` and `variant`. Also pull in the variable templates from namespace std when available. The main observable differences here are: 1) The types of `in_place_index_t<I>` and `in_place_type_t<T>` become function pointer types rather than structs when using the implementation that is not an alias of the std equivalents. 2) The types of `in_place_index<I>` and `in_place_type<T>` are not directly `in_place_index_t<I>` and `in_place_type_t<T>`, but rather they become function types that decay to the corresponding function pointer types. 3) The default constructor for `in_place_index_t` and `in_place_type_t` instantiations is no longer explicit, but for these templates I think that's less important than for something like `in_place_t` since the _type_t and _index_t versions basically never have their template parameter non-deduced when participating in overload resolution with conflicting candidates. 4) While idiomatic usage of `in_place_type_t` and `in_place_index_t` with std::variant and std::any should not be affected, there is the possibility that strange, non-idiomatic uses may be affected in the wild. 5) Default construction (rather than value-initialization) leads to a default-constructed pointer. PiperOrigin-RevId: 244180003 -- b9ac5a96581837ffa24532117b7ea302a5569751 by Derek Mauro <dmauro@google.com>: Fix MSVC debug assertion. isprint is undefined for values not representable as unsigned char or EOF. PiperOrigin-RevId: 244083005 -- 41758be6137c2f25e84b50f23938e49484be2903 by Shaindel Schwartz <shaindel@google.com>: Update config settings for Apple platforms. PiperOrigin-RevId: 244040587 -- c90df6a26db94b0305a0c954455a621542a89d91 by Abseil Team <absl-team@google.com>: Internal change PiperOrigin-RevId: 244024427 -- c71e9ceb89495354eca7d02bd905ffeaa9029aec by Derek Mauro <dmauro@google.com>: Adds missing ABSL_DEFAULT_COPTS and ABSL_TEST_COPTS to CMakeLists.txt Don't error on deprecated declarations in tests. It is completely reasonable to test that code marked deprecated still works. PiperOrigin-RevId: 244003941 -- e1326a96527a8ba9b8d120161545260da9c4562e by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 243990623 -- 90b8e12934c7711e1bfcc0117d21288bf9220dee by Abseil Team <absl-team@google.com>: Add variation of absl::Base64Escape/WebSafeBase64Escape that directly returns its result. PiperOrigin-RevId: 243894308 -- 317fef3344481ebc5c35712d42f5d8a0fa64dff4 by Abseil Team <absl-team@google.com>: Enable raw logging in Emscripten builds. PiperOrigin-RevId: 243893705 GitOrigin-RevId: 5a5dba4252e764e6737070bf0a31074bf23a3b41 Change-Id: I19293aab73cc98d9e9bf6a9fdc30819764adb9db
2019-04-23 21:04:13 +02:00
// anyway). To avoid the ambiguity, we work off SlotAlloc which we have
// bound more carefully.
if (std::is_same<SlotAlloc, std::allocator<slot_type>>::value &&
slots_ == nullptr) {
Export of internal Abseil changes. -- 7fa1107161a03dac53fb84c2b06d8092616c7b13 by Abseil Team <absl-team@google.com>: Harden the generic stacktrace implementation for use during early program execution PiperOrigin-RevId: 226375950 -- 079f9969329f5eb66f647dd3c44b17541b1bf217 by Matt Kulukundis <kfm@google.com>: Workaround platforms that have over-aggressive warnings on -Wexit-time-destructors PiperOrigin-RevId: 226362948 -- 1447943f509be681ca5495add0162c750ef237f1 by Matt Kulukundis <kfm@google.com>: Switch from 64 to size_t atomics so they work on embedded platforms that do not have 64 bit atomics. PiperOrigin-RevId: 226210704 -- d14d49837ae2bcde74051e0c79c18ee0f43866b9 by Tom Manshreck <shreck@google.com>: Develop initial documentation for API breaking changes process: PiperOrigin-RevId: 226210021 -- 7ea3d7fe0e86979dab83a5fc9cc3bf1d6cb3bd53 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 226195522 -- 7de873e880d7f016a4fa1e08d626f0535cc470af by Abseil Team <absl-team@google.com>: Make Abseil LICENSE files newline terminated, with a single trailing blank line. Also remove line-ending whitespace. PiperOrigin-RevId: 226182949 -- 7d00643fadfad7f0d992c68bd9d2ed2e5bc960b0 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226045282 -- c4a0a11c0ce2875271191e477f3d36eaaeca4613 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226038273 -- 8ee4ebbb1ae5cda119e436e5ff7e3aa966608c10 by Matt Kulukundis <kfm@google.com>: Adds a global sampler which tracks a fraction of live tables for collecting telemetry data. PiperOrigin-RevId: 226032080 -- d576446f050518cd1b0ae447d682d8552f0e7e30 by Mark Barolak <mbar@google.com>: Replace an internal CaseEqual function with calls to the identical absl::EqualsIgnoreCase. This closes out a rather old TODO. PiperOrigin-RevId: 226024779 -- 6b23f1ee028a5ffa608c920424f1220a117a8f3d by Abseil Team <absl-team@google.com>: Add December 2018 LTS branch to list of LTS branches. PiperOrigin-RevId: 226011333 -- bb0833a43bdaef4c8c059b17bcd27ba9a085a114 by Mark Barolak <mbar@google.com>: Explicitly state that when the SimpleAtoi family of functions encounter an error, the value of their output parameter is unspecified. Also standardize the name of the output parameter to be `out`. PiperOrigin-RevId: 225997035 -- 46c1876b1a248eabda7545daa61a74a4cdfe9077 by Abseil Team <absl-team@google.com>: Remove deprecated CMake function absl_test, absl_library and absl_header_library PiperOrigin-RevId: 225950041 GitOrigin-RevId: 7fa1107161a03dac53fb84c2b06d8092616c7b13 Change-Id: I2ca9d3aada9292614527d1339a7557494139b806
2018-12-20 21:29:59 +01:00
infoz_ = Sample();
}
auto layout = MakeLayout(capacity_);
char* mem = static_cast<char*>(
Allocate<Layout::Alignment()>(&alloc_ref(), layout.AllocSize()));
ctrl_ = reinterpret_cast<ctrl_t*>(layout.template Pointer<0>(mem));
slots_ = layout.template Pointer<1>(mem);
reset_ctrl();
reset_growth_left();
Export of internal Abseil changes. -- 7fa1107161a03dac53fb84c2b06d8092616c7b13 by Abseil Team <absl-team@google.com>: Harden the generic stacktrace implementation for use during early program execution PiperOrigin-RevId: 226375950 -- 079f9969329f5eb66f647dd3c44b17541b1bf217 by Matt Kulukundis <kfm@google.com>: Workaround platforms that have over-aggressive warnings on -Wexit-time-destructors PiperOrigin-RevId: 226362948 -- 1447943f509be681ca5495add0162c750ef237f1 by Matt Kulukundis <kfm@google.com>: Switch from 64 to size_t atomics so they work on embedded platforms that do not have 64 bit atomics. PiperOrigin-RevId: 226210704 -- d14d49837ae2bcde74051e0c79c18ee0f43866b9 by Tom Manshreck <shreck@google.com>: Develop initial documentation for API breaking changes process: PiperOrigin-RevId: 226210021 -- 7ea3d7fe0e86979dab83a5fc9cc3bf1d6cb3bd53 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 226195522 -- 7de873e880d7f016a4fa1e08d626f0535cc470af by Abseil Team <absl-team@google.com>: Make Abseil LICENSE files newline terminated, with a single trailing blank line. Also remove line-ending whitespace. PiperOrigin-RevId: 226182949 -- 7d00643fadfad7f0d992c68bd9d2ed2e5bc960b0 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226045282 -- c4a0a11c0ce2875271191e477f3d36eaaeca4613 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226038273 -- 8ee4ebbb1ae5cda119e436e5ff7e3aa966608c10 by Matt Kulukundis <kfm@google.com>: Adds a global sampler which tracks a fraction of live tables for collecting telemetry data. PiperOrigin-RevId: 226032080 -- d576446f050518cd1b0ae447d682d8552f0e7e30 by Mark Barolak <mbar@google.com>: Replace an internal CaseEqual function with calls to the identical absl::EqualsIgnoreCase. This closes out a rather old TODO. PiperOrigin-RevId: 226024779 -- 6b23f1ee028a5ffa608c920424f1220a117a8f3d by Abseil Team <absl-team@google.com>: Add December 2018 LTS branch to list of LTS branches. PiperOrigin-RevId: 226011333 -- bb0833a43bdaef4c8c059b17bcd27ba9a085a114 by Mark Barolak <mbar@google.com>: Explicitly state that when the SimpleAtoi family of functions encounter an error, the value of their output parameter is unspecified. Also standardize the name of the output parameter to be `out`. PiperOrigin-RevId: 225997035 -- 46c1876b1a248eabda7545daa61a74a4cdfe9077 by Abseil Team <absl-team@google.com>: Remove deprecated CMake function absl_test, absl_library and absl_header_library PiperOrigin-RevId: 225950041 GitOrigin-RevId: 7fa1107161a03dac53fb84c2b06d8092616c7b13 Change-Id: I2ca9d3aada9292614527d1339a7557494139b806
2018-12-20 21:29:59 +01:00
infoz_.RecordStorageChanged(size_, capacity_);
}
void destroy_slots() {
if (!capacity_) return;
for (size_t i = 0; i != capacity_; ++i) {
if (IsFull(ctrl_[i])) {
PolicyTraits::destroy(&alloc_ref(), slots_ + i);
}
}
auto layout = MakeLayout(capacity_);
// Unpoison before returning the memory to the allocator.
SanitizerUnpoisonMemoryRegion(slots_, sizeof(slot_type) * capacity_);
Deallocate<Layout::Alignment()>(&alloc_ref(), ctrl_, layout.AllocSize());
ctrl_ = EmptyGroup();
slots_ = nullptr;
size_ = 0;
capacity_ = 0;
growth_left() = 0;
}
void resize(size_t new_capacity) {
assert(IsValidCapacity(new_capacity));
auto* old_ctrl = ctrl_;
auto* old_slots = slots_;
const size_t old_capacity = capacity_;
capacity_ = new_capacity;
initialize_slots();
Export of internal Abseil changes. -- 3d20ce6cd6541579abecaba169d4b8716d511272 by Jon Cohen <cohenjon@google.com>: Only use LSAN for clang version >= 3.5. This should fix https://github.com/abseil/abseil-cpp/issues/244 PiperOrigin-RevId: 234675129 -- e15bd4ec7a81aa95cc3d09fa1e0e81d58ae478fb by Conrad Parker <conradparker@google.com>: Fix errors in apply() sample code The following changes are made: * Make the example method public. * Give the two user functions different names to avoid confusion about whether apply() can select the correct overload of a function based on its tuple argument (it can't). * Pass tuple2 to the second example apply() invocation, instead of passing its contents individually. * Fix a s/tuple/tuple3/ typo in the third example apply() invocation. PiperOrigin-RevId: 234223407 -- de0ed71e21bc76ddf9fe715fdbaef74cd0df95c7 by Abseil Team <absl-team@google.com>: First test if a macro is defined to avoid -Wundef. ABSL clients may need to compile their code with the -Wundef warning flag. It will be helpful if ABSL header files can be compiled without the -Wundef warning. How to avoid the -Wundef warning: If a macro may be undefined, we need to first test whether the macro is defined before testing its value. We can't rely on the C preprocessor rule that an undefined macro has the value 0L. PiperOrigin-RevId: 234201123 -- fa484ad7dae0cac21140a96662809ecb0ec8eb5d by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 234185697 -- d69b1baef681e27954b065375ecf9c2320463b2b by Samuel Benzaquen <sbenza@google.com>: Mix pointers more thoroughly. Some pointer alignments interact badly with the mixing constant. By mixing twice we reduce this problem. PiperOrigin-RevId: 234178401 -- 1041d0e474610f3a8fea0db90958857327d6da1c by Samuel Benzaquen <sbenza@google.com>: Record rehashes in the hashtablez struct. Only recording the probe length on insertion causes a huge overestimation of the total probe length at any given time. With natural growth, elements are inserted when the load factor is between (max load/2, max load). However, after a rehash the majority of elements are actually inserted when the load factor is less than max/2 and have a much lower average probe length. Also reset some values when the table is cleared. PiperOrigin-RevId: 234013580 -- 299205caf3c89c47339f7409bc831746602cea84 by Mark Barolak <mbar@google.com>: Fix a sample code snippet that assumes `absl::string_view::const_iterator` is `const char*`. This is generally true, however in C++17 builds, absl::string_view is an alias for std::string_view and on MSVC, the std::string_view::const_iterator is an object instead of just a pointer. PiperOrigin-RevId: 233844595 -- af6c6370cf51a1e6c1469c79dfb2a486a4009136 by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 233773470 -- 6e59e4b8e2bb6101b448f0f32b0bea81fe399ccf by Abseil Team <absl-team@google.com>: fix typo in {Starts|Ends}WithIgnoreCase comment in match.h PiperOrigin-RevId: 233662951 GitOrigin-RevId: 3d20ce6cd6541579abecaba169d4b8716d511272 Change-Id: Ib9a29b1c38c6aedf5d9f3f7f00596e8d30e864dd
2019-02-19 23:29:09 +01:00
size_t total_probe_length = 0;
for (size_t i = 0; i != old_capacity; ++i) {
if (IsFull(old_ctrl[i])) {
size_t hash = PolicyTraits::apply(HashElement{hash_ref()},
PolicyTraits::element(old_slots + i));
Export of internal Abseil changes. -- 3d20ce6cd6541579abecaba169d4b8716d511272 by Jon Cohen <cohenjon@google.com>: Only use LSAN for clang version >= 3.5. This should fix https://github.com/abseil/abseil-cpp/issues/244 PiperOrigin-RevId: 234675129 -- e15bd4ec7a81aa95cc3d09fa1e0e81d58ae478fb by Conrad Parker <conradparker@google.com>: Fix errors in apply() sample code The following changes are made: * Make the example method public. * Give the two user functions different names to avoid confusion about whether apply() can select the correct overload of a function based on its tuple argument (it can't). * Pass tuple2 to the second example apply() invocation, instead of passing its contents individually. * Fix a s/tuple/tuple3/ typo in the third example apply() invocation. PiperOrigin-RevId: 234223407 -- de0ed71e21bc76ddf9fe715fdbaef74cd0df95c7 by Abseil Team <absl-team@google.com>: First test if a macro is defined to avoid -Wundef. ABSL clients may need to compile their code with the -Wundef warning flag. It will be helpful if ABSL header files can be compiled without the -Wundef warning. How to avoid the -Wundef warning: If a macro may be undefined, we need to first test whether the macro is defined before testing its value. We can't rely on the C preprocessor rule that an undefined macro has the value 0L. PiperOrigin-RevId: 234201123 -- fa484ad7dae0cac21140a96662809ecb0ec8eb5d by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 234185697 -- d69b1baef681e27954b065375ecf9c2320463b2b by Samuel Benzaquen <sbenza@google.com>: Mix pointers more thoroughly. Some pointer alignments interact badly with the mixing constant. By mixing twice we reduce this problem. PiperOrigin-RevId: 234178401 -- 1041d0e474610f3a8fea0db90958857327d6da1c by Samuel Benzaquen <sbenza@google.com>: Record rehashes in the hashtablez struct. Only recording the probe length on insertion causes a huge overestimation of the total probe length at any given time. With natural growth, elements are inserted when the load factor is between (max load/2, max load). However, after a rehash the majority of elements are actually inserted when the load factor is less than max/2 and have a much lower average probe length. Also reset some values when the table is cleared. PiperOrigin-RevId: 234013580 -- 299205caf3c89c47339f7409bc831746602cea84 by Mark Barolak <mbar@google.com>: Fix a sample code snippet that assumes `absl::string_view::const_iterator` is `const char*`. This is generally true, however in C++17 builds, absl::string_view is an alias for std::string_view and on MSVC, the std::string_view::const_iterator is an object instead of just a pointer. PiperOrigin-RevId: 233844595 -- af6c6370cf51a1e6c1469c79dfb2a486a4009136 by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 233773470 -- 6e59e4b8e2bb6101b448f0f32b0bea81fe399ccf by Abseil Team <absl-team@google.com>: fix typo in {Starts|Ends}WithIgnoreCase comment in match.h PiperOrigin-RevId: 233662951 GitOrigin-RevId: 3d20ce6cd6541579abecaba169d4b8716d511272 Change-Id: Ib9a29b1c38c6aedf5d9f3f7f00596e8d30e864dd
2019-02-19 23:29:09 +01:00
auto target = find_first_non_full(hash);
size_t new_i = target.offset;
total_probe_length += target.probe_length;
set_ctrl(new_i, H2(hash));
PolicyTraits::transfer(&alloc_ref(), slots_ + new_i, old_slots + i);
}
}
if (old_capacity) {
SanitizerUnpoisonMemoryRegion(old_slots,
sizeof(slot_type) * old_capacity);
auto layout = MakeLayout(old_capacity);
Deallocate<Layout::Alignment()>(&alloc_ref(), old_ctrl,
layout.AllocSize());
}
Export of internal Abseil changes. -- 3d20ce6cd6541579abecaba169d4b8716d511272 by Jon Cohen <cohenjon@google.com>: Only use LSAN for clang version >= 3.5. This should fix https://github.com/abseil/abseil-cpp/issues/244 PiperOrigin-RevId: 234675129 -- e15bd4ec7a81aa95cc3d09fa1e0e81d58ae478fb by Conrad Parker <conradparker@google.com>: Fix errors in apply() sample code The following changes are made: * Make the example method public. * Give the two user functions different names to avoid confusion about whether apply() can select the correct overload of a function based on its tuple argument (it can't). * Pass tuple2 to the second example apply() invocation, instead of passing its contents individually. * Fix a s/tuple/tuple3/ typo in the third example apply() invocation. PiperOrigin-RevId: 234223407 -- de0ed71e21bc76ddf9fe715fdbaef74cd0df95c7 by Abseil Team <absl-team@google.com>: First test if a macro is defined to avoid -Wundef. ABSL clients may need to compile their code with the -Wundef warning flag. It will be helpful if ABSL header files can be compiled without the -Wundef warning. How to avoid the -Wundef warning: If a macro may be undefined, we need to first test whether the macro is defined before testing its value. We can't rely on the C preprocessor rule that an undefined macro has the value 0L. PiperOrigin-RevId: 234201123 -- fa484ad7dae0cac21140a96662809ecb0ec8eb5d by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 234185697 -- d69b1baef681e27954b065375ecf9c2320463b2b by Samuel Benzaquen <sbenza@google.com>: Mix pointers more thoroughly. Some pointer alignments interact badly with the mixing constant. By mixing twice we reduce this problem. PiperOrigin-RevId: 234178401 -- 1041d0e474610f3a8fea0db90958857327d6da1c by Samuel Benzaquen <sbenza@google.com>: Record rehashes in the hashtablez struct. Only recording the probe length on insertion causes a huge overestimation of the total probe length at any given time. With natural growth, elements are inserted when the load factor is between (max load/2, max load). However, after a rehash the majority of elements are actually inserted when the load factor is less than max/2 and have a much lower average probe length. Also reset some values when the table is cleared. PiperOrigin-RevId: 234013580 -- 299205caf3c89c47339f7409bc831746602cea84 by Mark Barolak <mbar@google.com>: Fix a sample code snippet that assumes `absl::string_view::const_iterator` is `const char*`. This is generally true, however in C++17 builds, absl::string_view is an alias for std::string_view and on MSVC, the std::string_view::const_iterator is an object instead of just a pointer. PiperOrigin-RevId: 233844595 -- af6c6370cf51a1e6c1469c79dfb2a486a4009136 by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 233773470 -- 6e59e4b8e2bb6101b448f0f32b0bea81fe399ccf by Abseil Team <absl-team@google.com>: fix typo in {Starts|Ends}WithIgnoreCase comment in match.h PiperOrigin-RevId: 233662951 GitOrigin-RevId: 3d20ce6cd6541579abecaba169d4b8716d511272 Change-Id: Ib9a29b1c38c6aedf5d9f3f7f00596e8d30e864dd
2019-02-19 23:29:09 +01:00
infoz_.RecordRehash(total_probe_length);
}
void drop_deletes_without_resize() ABSL_ATTRIBUTE_NOINLINE {
assert(IsValidCapacity(capacity_));
Export of internal Abseil changes. -- 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb by Greg Falcon <gfalcon@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 238061818 -- 867a7ca318fac2991ea9a4107dbae3cc9fbf974a by Abseil Team <absl-team@google.com>: Added a IWYU export pragma when including a standard header for the purpose of aliasing its symbols. PiperOrigin-RevId: 238022277 -- 17047745058f2f151cd986ea9f649512542d3876 by Matt Armstrong <marmstrong@google.com>: Clarify the comment discouraging WrapUnique<T>(x) calls. PiperOrigin-RevId: 237873803 -- 3dcb2e4968243d33ca0ce53280c445df50f4a7ec by Samuel Benzaquen <sbenza@google.com>: Workaround clang bug https://bugs.llvm.org/show_bug.cgi?id=38289 PiperOrigin-RevId: 237873551 -- f348d2dc7087a990cbdfb95aa51fd7ff478ae40e by Samuel Benzaquen <sbenza@google.com>: Reduce minimum capacity to 1. This reduces memory usage for small tables. A flat_hash_set<int> of 1 element goes from 92 bytes to 24. A flat_hash_set<string> of 1 element goes from 512 bytes to 56. PiperOrigin-RevId: 237859811 -- 9c8125be5e4e5d22a7bb62bdec8c323338385c1b by Jon Cohen <cohenjon@google.com>: Bump to CMake 3.5. This is the oldest modern cmake being included by default in most popular OS distributions according to https://repology.org/project/cmake/versions. Specifically, Ubuntu LTS 16.04 uses cmake 3.5 (https://packages.ubuntu.com/xenial/cmake) PiperOrigin-RevId: 237859345 -- 07638d672e0a4dced986a62750cfd8318ed36ffa by Derek Mauro <dmauro@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 237714597 GitOrigin-RevId: 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb Change-Id: I5faecc45add4a5a774d4f9baf06e5519091f2ccc
2019-03-12 19:39:15 +01:00
assert(!is_small());
// Algorithm:
// - mark all DELETED slots as EMPTY
// - mark all FULL slots as DELETED
// - for each slot marked as DELETED
// hash = Hash(element)
// target = find_first_non_full(hash)
// if target is in the same group
// mark slot as FULL
// else if target is EMPTY
// transfer element to target
// mark slot as EMPTY
// mark target as FULL
// else if target is DELETED
// swap current element with target element
// mark target as FULL
// repeat procedure for current slot with moved from element (target)
ConvertDeletedToEmptyAndFullToDeleted(ctrl_, capacity_);
typename std::aligned_storage<sizeof(slot_type), alignof(slot_type)>::type
raw;
Export of internal Abseil changes. -- 3d20ce6cd6541579abecaba169d4b8716d511272 by Jon Cohen <cohenjon@google.com>: Only use LSAN for clang version >= 3.5. This should fix https://github.com/abseil/abseil-cpp/issues/244 PiperOrigin-RevId: 234675129 -- e15bd4ec7a81aa95cc3d09fa1e0e81d58ae478fb by Conrad Parker <conradparker@google.com>: Fix errors in apply() sample code The following changes are made: * Make the example method public. * Give the two user functions different names to avoid confusion about whether apply() can select the correct overload of a function based on its tuple argument (it can't). * Pass tuple2 to the second example apply() invocation, instead of passing its contents individually. * Fix a s/tuple/tuple3/ typo in the third example apply() invocation. PiperOrigin-RevId: 234223407 -- de0ed71e21bc76ddf9fe715fdbaef74cd0df95c7 by Abseil Team <absl-team@google.com>: First test if a macro is defined to avoid -Wundef. ABSL clients may need to compile their code with the -Wundef warning flag. It will be helpful if ABSL header files can be compiled without the -Wundef warning. How to avoid the -Wundef warning: If a macro may be undefined, we need to first test whether the macro is defined before testing its value. We can't rely on the C preprocessor rule that an undefined macro has the value 0L. PiperOrigin-RevId: 234201123 -- fa484ad7dae0cac21140a96662809ecb0ec8eb5d by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 234185697 -- d69b1baef681e27954b065375ecf9c2320463b2b by Samuel Benzaquen <sbenza@google.com>: Mix pointers more thoroughly. Some pointer alignments interact badly with the mixing constant. By mixing twice we reduce this problem. PiperOrigin-RevId: 234178401 -- 1041d0e474610f3a8fea0db90958857327d6da1c by Samuel Benzaquen <sbenza@google.com>: Record rehashes in the hashtablez struct. Only recording the probe length on insertion causes a huge overestimation of the total probe length at any given time. With natural growth, elements are inserted when the load factor is between (max load/2, max load). However, after a rehash the majority of elements are actually inserted when the load factor is less than max/2 and have a much lower average probe length. Also reset some values when the table is cleared. PiperOrigin-RevId: 234013580 -- 299205caf3c89c47339f7409bc831746602cea84 by Mark Barolak <mbar@google.com>: Fix a sample code snippet that assumes `absl::string_view::const_iterator` is `const char*`. This is generally true, however in C++17 builds, absl::string_view is an alias for std::string_view and on MSVC, the std::string_view::const_iterator is an object instead of just a pointer. PiperOrigin-RevId: 233844595 -- af6c6370cf51a1e6c1469c79dfb2a486a4009136 by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 233773470 -- 6e59e4b8e2bb6101b448f0f32b0bea81fe399ccf by Abseil Team <absl-team@google.com>: fix typo in {Starts|Ends}WithIgnoreCase comment in match.h PiperOrigin-RevId: 233662951 GitOrigin-RevId: 3d20ce6cd6541579abecaba169d4b8716d511272 Change-Id: Ib9a29b1c38c6aedf5d9f3f7f00596e8d30e864dd
2019-02-19 23:29:09 +01:00
size_t total_probe_length = 0;
slot_type* slot = reinterpret_cast<slot_type*>(&raw);
for (size_t i = 0; i != capacity_; ++i) {
if (!IsDeleted(ctrl_[i])) continue;
size_t hash = PolicyTraits::apply(HashElement{hash_ref()},
PolicyTraits::element(slots_ + i));
Export of internal Abseil changes. -- 3d20ce6cd6541579abecaba169d4b8716d511272 by Jon Cohen <cohenjon@google.com>: Only use LSAN for clang version >= 3.5. This should fix https://github.com/abseil/abseil-cpp/issues/244 PiperOrigin-RevId: 234675129 -- e15bd4ec7a81aa95cc3d09fa1e0e81d58ae478fb by Conrad Parker <conradparker@google.com>: Fix errors in apply() sample code The following changes are made: * Make the example method public. * Give the two user functions different names to avoid confusion about whether apply() can select the correct overload of a function based on its tuple argument (it can't). * Pass tuple2 to the second example apply() invocation, instead of passing its contents individually. * Fix a s/tuple/tuple3/ typo in the third example apply() invocation. PiperOrigin-RevId: 234223407 -- de0ed71e21bc76ddf9fe715fdbaef74cd0df95c7 by Abseil Team <absl-team@google.com>: First test if a macro is defined to avoid -Wundef. ABSL clients may need to compile their code with the -Wundef warning flag. It will be helpful if ABSL header files can be compiled without the -Wundef warning. How to avoid the -Wundef warning: If a macro may be undefined, we need to first test whether the macro is defined before testing its value. We can't rely on the C preprocessor rule that an undefined macro has the value 0L. PiperOrigin-RevId: 234201123 -- fa484ad7dae0cac21140a96662809ecb0ec8eb5d by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 234185697 -- d69b1baef681e27954b065375ecf9c2320463b2b by Samuel Benzaquen <sbenza@google.com>: Mix pointers more thoroughly. Some pointer alignments interact badly with the mixing constant. By mixing twice we reduce this problem. PiperOrigin-RevId: 234178401 -- 1041d0e474610f3a8fea0db90958857327d6da1c by Samuel Benzaquen <sbenza@google.com>: Record rehashes in the hashtablez struct. Only recording the probe length on insertion causes a huge overestimation of the total probe length at any given time. With natural growth, elements are inserted when the load factor is between (max load/2, max load). However, after a rehash the majority of elements are actually inserted when the load factor is less than max/2 and have a much lower average probe length. Also reset some values when the table is cleared. PiperOrigin-RevId: 234013580 -- 299205caf3c89c47339f7409bc831746602cea84 by Mark Barolak <mbar@google.com>: Fix a sample code snippet that assumes `absl::string_view::const_iterator` is `const char*`. This is generally true, however in C++17 builds, absl::string_view is an alias for std::string_view and on MSVC, the std::string_view::const_iterator is an object instead of just a pointer. PiperOrigin-RevId: 233844595 -- af6c6370cf51a1e6c1469c79dfb2a486a4009136 by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 233773470 -- 6e59e4b8e2bb6101b448f0f32b0bea81fe399ccf by Abseil Team <absl-team@google.com>: fix typo in {Starts|Ends}WithIgnoreCase comment in match.h PiperOrigin-RevId: 233662951 GitOrigin-RevId: 3d20ce6cd6541579abecaba169d4b8716d511272 Change-Id: Ib9a29b1c38c6aedf5d9f3f7f00596e8d30e864dd
2019-02-19 23:29:09 +01:00
auto target = find_first_non_full(hash);
size_t new_i = target.offset;
total_probe_length += target.probe_length;
// Verify if the old and new i fall within the same group wrt the hash.
// If they do, we don't need to move the object as it falls already in the
// best probe we can.
const auto probe_index = [&](size_t pos) {
return ((pos - probe(hash).offset()) & capacity_) / Group::kWidth;
};
// Element doesn't move.
if (ABSL_PREDICT_TRUE(probe_index(new_i) == probe_index(i))) {
set_ctrl(i, H2(hash));
continue;
}
if (IsEmpty(ctrl_[new_i])) {
// Transfer element to the empty spot.
// set_ctrl poisons/unpoisons the slots so we have to call it at the
// right time.
set_ctrl(new_i, H2(hash));
PolicyTraits::transfer(&alloc_ref(), slots_ + new_i, slots_ + i);
set_ctrl(i, kEmpty);
} else {
assert(IsDeleted(ctrl_[new_i]));
set_ctrl(new_i, H2(hash));
// Until we are done rehashing, DELETED marks previously FULL slots.
// Swap i and new_i elements.
PolicyTraits::transfer(&alloc_ref(), slot, slots_ + i);
PolicyTraits::transfer(&alloc_ref(), slots_ + i, slots_ + new_i);
PolicyTraits::transfer(&alloc_ref(), slots_ + new_i, slot);
--i; // repeat
}
}
reset_growth_left();
Export of internal Abseil changes. -- 3d20ce6cd6541579abecaba169d4b8716d511272 by Jon Cohen <cohenjon@google.com>: Only use LSAN for clang version >= 3.5. This should fix https://github.com/abseil/abseil-cpp/issues/244 PiperOrigin-RevId: 234675129 -- e15bd4ec7a81aa95cc3d09fa1e0e81d58ae478fb by Conrad Parker <conradparker@google.com>: Fix errors in apply() sample code The following changes are made: * Make the example method public. * Give the two user functions different names to avoid confusion about whether apply() can select the correct overload of a function based on its tuple argument (it can't). * Pass tuple2 to the second example apply() invocation, instead of passing its contents individually. * Fix a s/tuple/tuple3/ typo in the third example apply() invocation. PiperOrigin-RevId: 234223407 -- de0ed71e21bc76ddf9fe715fdbaef74cd0df95c7 by Abseil Team <absl-team@google.com>: First test if a macro is defined to avoid -Wundef. ABSL clients may need to compile their code with the -Wundef warning flag. It will be helpful if ABSL header files can be compiled without the -Wundef warning. How to avoid the -Wundef warning: If a macro may be undefined, we need to first test whether the macro is defined before testing its value. We can't rely on the C preprocessor rule that an undefined macro has the value 0L. PiperOrigin-RevId: 234201123 -- fa484ad7dae0cac21140a96662809ecb0ec8eb5d by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 234185697 -- d69b1baef681e27954b065375ecf9c2320463b2b by Samuel Benzaquen <sbenza@google.com>: Mix pointers more thoroughly. Some pointer alignments interact badly with the mixing constant. By mixing twice we reduce this problem. PiperOrigin-RevId: 234178401 -- 1041d0e474610f3a8fea0db90958857327d6da1c by Samuel Benzaquen <sbenza@google.com>: Record rehashes in the hashtablez struct. Only recording the probe length on insertion causes a huge overestimation of the total probe length at any given time. With natural growth, elements are inserted when the load factor is between (max load/2, max load). However, after a rehash the majority of elements are actually inserted when the load factor is less than max/2 and have a much lower average probe length. Also reset some values when the table is cleared. PiperOrigin-RevId: 234013580 -- 299205caf3c89c47339f7409bc831746602cea84 by Mark Barolak <mbar@google.com>: Fix a sample code snippet that assumes `absl::string_view::const_iterator` is `const char*`. This is generally true, however in C++17 builds, absl::string_view is an alias for std::string_view and on MSVC, the std::string_view::const_iterator is an object instead of just a pointer. PiperOrigin-RevId: 233844595 -- af6c6370cf51a1e6c1469c79dfb2a486a4009136 by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 233773470 -- 6e59e4b8e2bb6101b448f0f32b0bea81fe399ccf by Abseil Team <absl-team@google.com>: fix typo in {Starts|Ends}WithIgnoreCase comment in match.h PiperOrigin-RevId: 233662951 GitOrigin-RevId: 3d20ce6cd6541579abecaba169d4b8716d511272 Change-Id: Ib9a29b1c38c6aedf5d9f3f7f00596e8d30e864dd
2019-02-19 23:29:09 +01:00
infoz_.RecordRehash(total_probe_length);
}
void rehash_and_grow_if_necessary() {
if (capacity_ == 0) {
Export of internal Abseil changes. -- 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb by Greg Falcon <gfalcon@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 238061818 -- 867a7ca318fac2991ea9a4107dbae3cc9fbf974a by Abseil Team <absl-team@google.com>: Added a IWYU export pragma when including a standard header for the purpose of aliasing its symbols. PiperOrigin-RevId: 238022277 -- 17047745058f2f151cd986ea9f649512542d3876 by Matt Armstrong <marmstrong@google.com>: Clarify the comment discouraging WrapUnique<T>(x) calls. PiperOrigin-RevId: 237873803 -- 3dcb2e4968243d33ca0ce53280c445df50f4a7ec by Samuel Benzaquen <sbenza@google.com>: Workaround clang bug https://bugs.llvm.org/show_bug.cgi?id=38289 PiperOrigin-RevId: 237873551 -- f348d2dc7087a990cbdfb95aa51fd7ff478ae40e by Samuel Benzaquen <sbenza@google.com>: Reduce minimum capacity to 1. This reduces memory usage for small tables. A flat_hash_set<int> of 1 element goes from 92 bytes to 24. A flat_hash_set<string> of 1 element goes from 512 bytes to 56. PiperOrigin-RevId: 237859811 -- 9c8125be5e4e5d22a7bb62bdec8c323338385c1b by Jon Cohen <cohenjon@google.com>: Bump to CMake 3.5. This is the oldest modern cmake being included by default in most popular OS distributions according to https://repology.org/project/cmake/versions. Specifically, Ubuntu LTS 16.04 uses cmake 3.5 (https://packages.ubuntu.com/xenial/cmake) PiperOrigin-RevId: 237859345 -- 07638d672e0a4dced986a62750cfd8318ed36ffa by Derek Mauro <dmauro@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 237714597 GitOrigin-RevId: 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb Change-Id: I5faecc45add4a5a774d4f9baf06e5519091f2ccc
2019-03-12 19:39:15 +01:00
resize(1);
} else if (size() <= CapacityToGrowth(capacity()) / 2) {
// Squash DELETED without growing if there is enough capacity.
drop_deletes_without_resize();
} else {
// Otherwise grow the container.
resize(capacity_ * 2 + 1);
}
}
bool has_element(const value_type& elem) const {
size_t hash = PolicyTraits::apply(HashElement{hash_ref()}, elem);
auto seq = probe(hash);
while (true) {
Group g{ctrl_ + seq.offset()};
for (int i : g.Match(H2(hash))) {
if (ABSL_PREDICT_TRUE(PolicyTraits::element(slots_ + seq.offset(i)) ==
elem))
return true;
}
if (ABSL_PREDICT_TRUE(g.MatchEmpty())) return false;
seq.next();
assert(seq.index() < capacity_ && "full table!");
}
return false;
}
// Probes the raw_hash_set with the probe sequence for hash and returns the
// pointer to the first empty or deleted slot.
// NOTE: this function must work with tables having both kEmpty and kDelete
// in one group. Such tables appears during drop_deletes_without_resize.
//
// This function is very useful when insertions happen and:
// - the input is already a set
// - there are enough slots
// - the element with the hash is not in the table
Export of internal Abseil changes. -- 7fa1107161a03dac53fb84c2b06d8092616c7b13 by Abseil Team <absl-team@google.com>: Harden the generic stacktrace implementation for use during early program execution PiperOrigin-RevId: 226375950 -- 079f9969329f5eb66f647dd3c44b17541b1bf217 by Matt Kulukundis <kfm@google.com>: Workaround platforms that have over-aggressive warnings on -Wexit-time-destructors PiperOrigin-RevId: 226362948 -- 1447943f509be681ca5495add0162c750ef237f1 by Matt Kulukundis <kfm@google.com>: Switch from 64 to size_t atomics so they work on embedded platforms that do not have 64 bit atomics. PiperOrigin-RevId: 226210704 -- d14d49837ae2bcde74051e0c79c18ee0f43866b9 by Tom Manshreck <shreck@google.com>: Develop initial documentation for API breaking changes process: PiperOrigin-RevId: 226210021 -- 7ea3d7fe0e86979dab83a5fc9cc3bf1d6cb3bd53 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 226195522 -- 7de873e880d7f016a4fa1e08d626f0535cc470af by Abseil Team <absl-team@google.com>: Make Abseil LICENSE files newline terminated, with a single trailing blank line. Also remove line-ending whitespace. PiperOrigin-RevId: 226182949 -- 7d00643fadfad7f0d992c68bd9d2ed2e5bc960b0 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226045282 -- c4a0a11c0ce2875271191e477f3d36eaaeca4613 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226038273 -- 8ee4ebbb1ae5cda119e436e5ff7e3aa966608c10 by Matt Kulukundis <kfm@google.com>: Adds a global sampler which tracks a fraction of live tables for collecting telemetry data. PiperOrigin-RevId: 226032080 -- d576446f050518cd1b0ae447d682d8552f0e7e30 by Mark Barolak <mbar@google.com>: Replace an internal CaseEqual function with calls to the identical absl::EqualsIgnoreCase. This closes out a rather old TODO. PiperOrigin-RevId: 226024779 -- 6b23f1ee028a5ffa608c920424f1220a117a8f3d by Abseil Team <absl-team@google.com>: Add December 2018 LTS branch to list of LTS branches. PiperOrigin-RevId: 226011333 -- bb0833a43bdaef4c8c059b17bcd27ba9a085a114 by Mark Barolak <mbar@google.com>: Explicitly state that when the SimpleAtoi family of functions encounter an error, the value of their output parameter is unspecified. Also standardize the name of the output parameter to be `out`. PiperOrigin-RevId: 225997035 -- 46c1876b1a248eabda7545daa61a74a4cdfe9077 by Abseil Team <absl-team@google.com>: Remove deprecated CMake function absl_test, absl_library and absl_header_library PiperOrigin-RevId: 225950041 GitOrigin-RevId: 7fa1107161a03dac53fb84c2b06d8092616c7b13 Change-Id: I2ca9d3aada9292614527d1339a7557494139b806
2018-12-20 21:29:59 +01:00
struct FindInfo {
size_t offset;
size_t probe_length;
};
FindInfo find_first_non_full(size_t hash) {
auto seq = probe(hash);
while (true) {
Group g{ctrl_ + seq.offset()};
auto mask = g.MatchEmptyOrDeleted();
if (mask) {
#if !defined(NDEBUG)
Export of internal Abseil changes. -- 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb by Greg Falcon <gfalcon@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 238061818 -- 867a7ca318fac2991ea9a4107dbae3cc9fbf974a by Abseil Team <absl-team@google.com>: Added a IWYU export pragma when including a standard header for the purpose of aliasing its symbols. PiperOrigin-RevId: 238022277 -- 17047745058f2f151cd986ea9f649512542d3876 by Matt Armstrong <marmstrong@google.com>: Clarify the comment discouraging WrapUnique<T>(x) calls. PiperOrigin-RevId: 237873803 -- 3dcb2e4968243d33ca0ce53280c445df50f4a7ec by Samuel Benzaquen <sbenza@google.com>: Workaround clang bug https://bugs.llvm.org/show_bug.cgi?id=38289 PiperOrigin-RevId: 237873551 -- f348d2dc7087a990cbdfb95aa51fd7ff478ae40e by Samuel Benzaquen <sbenza@google.com>: Reduce minimum capacity to 1. This reduces memory usage for small tables. A flat_hash_set<int> of 1 element goes from 92 bytes to 24. A flat_hash_set<string> of 1 element goes from 512 bytes to 56. PiperOrigin-RevId: 237859811 -- 9c8125be5e4e5d22a7bb62bdec8c323338385c1b by Jon Cohen <cohenjon@google.com>: Bump to CMake 3.5. This is the oldest modern cmake being included by default in most popular OS distributions according to https://repology.org/project/cmake/versions. Specifically, Ubuntu LTS 16.04 uses cmake 3.5 (https://packages.ubuntu.com/xenial/cmake) PiperOrigin-RevId: 237859345 -- 07638d672e0a4dced986a62750cfd8318ed36ffa by Derek Mauro <dmauro@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 237714597 GitOrigin-RevId: 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb Change-Id: I5faecc45add4a5a774d4f9baf06e5519091f2ccc
2019-03-12 19:39:15 +01:00
// We want to add entropy even when ASLR is not enabled.
// In debug build we will randomly insert in either the front or back of
// the group.
// TODO(kfm,sbenza): revisit after we do unconditional mixing
Export of internal Abseil changes. -- 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb by Greg Falcon <gfalcon@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 238061818 -- 867a7ca318fac2991ea9a4107dbae3cc9fbf974a by Abseil Team <absl-team@google.com>: Added a IWYU export pragma when including a standard header for the purpose of aliasing its symbols. PiperOrigin-RevId: 238022277 -- 17047745058f2f151cd986ea9f649512542d3876 by Matt Armstrong <marmstrong@google.com>: Clarify the comment discouraging WrapUnique<T>(x) calls. PiperOrigin-RevId: 237873803 -- 3dcb2e4968243d33ca0ce53280c445df50f4a7ec by Samuel Benzaquen <sbenza@google.com>: Workaround clang bug https://bugs.llvm.org/show_bug.cgi?id=38289 PiperOrigin-RevId: 237873551 -- f348d2dc7087a990cbdfb95aa51fd7ff478ae40e by Samuel Benzaquen <sbenza@google.com>: Reduce minimum capacity to 1. This reduces memory usage for small tables. A flat_hash_set<int> of 1 element goes from 92 bytes to 24. A flat_hash_set<string> of 1 element goes from 512 bytes to 56. PiperOrigin-RevId: 237859811 -- 9c8125be5e4e5d22a7bb62bdec8c323338385c1b by Jon Cohen <cohenjon@google.com>: Bump to CMake 3.5. This is the oldest modern cmake being included by default in most popular OS distributions according to https://repology.org/project/cmake/versions. Specifically, Ubuntu LTS 16.04 uses cmake 3.5 (https://packages.ubuntu.com/xenial/cmake) PiperOrigin-RevId: 237859345 -- 07638d672e0a4dced986a62750cfd8318ed36ffa by Derek Mauro <dmauro@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 237714597 GitOrigin-RevId: 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb Change-Id: I5faecc45add4a5a774d4f9baf06e5519091f2ccc
2019-03-12 19:39:15 +01:00
if (!is_small() && ShouldInsertBackwards(hash, ctrl_)) {
Export of internal Abseil changes. -- 7fa1107161a03dac53fb84c2b06d8092616c7b13 by Abseil Team <absl-team@google.com>: Harden the generic stacktrace implementation for use during early program execution PiperOrigin-RevId: 226375950 -- 079f9969329f5eb66f647dd3c44b17541b1bf217 by Matt Kulukundis <kfm@google.com>: Workaround platforms that have over-aggressive warnings on -Wexit-time-destructors PiperOrigin-RevId: 226362948 -- 1447943f509be681ca5495add0162c750ef237f1 by Matt Kulukundis <kfm@google.com>: Switch from 64 to size_t atomics so they work on embedded platforms that do not have 64 bit atomics. PiperOrigin-RevId: 226210704 -- d14d49837ae2bcde74051e0c79c18ee0f43866b9 by Tom Manshreck <shreck@google.com>: Develop initial documentation for API breaking changes process: PiperOrigin-RevId: 226210021 -- 7ea3d7fe0e86979dab83a5fc9cc3bf1d6cb3bd53 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 226195522 -- 7de873e880d7f016a4fa1e08d626f0535cc470af by Abseil Team <absl-team@google.com>: Make Abseil LICENSE files newline terminated, with a single trailing blank line. Also remove line-ending whitespace. PiperOrigin-RevId: 226182949 -- 7d00643fadfad7f0d992c68bd9d2ed2e5bc960b0 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226045282 -- c4a0a11c0ce2875271191e477f3d36eaaeca4613 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226038273 -- 8ee4ebbb1ae5cda119e436e5ff7e3aa966608c10 by Matt Kulukundis <kfm@google.com>: Adds a global sampler which tracks a fraction of live tables for collecting telemetry data. PiperOrigin-RevId: 226032080 -- d576446f050518cd1b0ae447d682d8552f0e7e30 by Mark Barolak <mbar@google.com>: Replace an internal CaseEqual function with calls to the identical absl::EqualsIgnoreCase. This closes out a rather old TODO. PiperOrigin-RevId: 226024779 -- 6b23f1ee028a5ffa608c920424f1220a117a8f3d by Abseil Team <absl-team@google.com>: Add December 2018 LTS branch to list of LTS branches. PiperOrigin-RevId: 226011333 -- bb0833a43bdaef4c8c059b17bcd27ba9a085a114 by Mark Barolak <mbar@google.com>: Explicitly state that when the SimpleAtoi family of functions encounter an error, the value of their output parameter is unspecified. Also standardize the name of the output parameter to be `out`. PiperOrigin-RevId: 225997035 -- 46c1876b1a248eabda7545daa61a74a4cdfe9077 by Abseil Team <absl-team@google.com>: Remove deprecated CMake function absl_test, absl_library and absl_header_library PiperOrigin-RevId: 225950041 GitOrigin-RevId: 7fa1107161a03dac53fb84c2b06d8092616c7b13 Change-Id: I2ca9d3aada9292614527d1339a7557494139b806
2018-12-20 21:29:59 +01:00
return {seq.offset(mask.HighestBitSet()), seq.index()};
Export of internal Abseil changes. -- 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb by Greg Falcon <gfalcon@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 238061818 -- 867a7ca318fac2991ea9a4107dbae3cc9fbf974a by Abseil Team <absl-team@google.com>: Added a IWYU export pragma when including a standard header for the purpose of aliasing its symbols. PiperOrigin-RevId: 238022277 -- 17047745058f2f151cd986ea9f649512542d3876 by Matt Armstrong <marmstrong@google.com>: Clarify the comment discouraging WrapUnique<T>(x) calls. PiperOrigin-RevId: 237873803 -- 3dcb2e4968243d33ca0ce53280c445df50f4a7ec by Samuel Benzaquen <sbenza@google.com>: Workaround clang bug https://bugs.llvm.org/show_bug.cgi?id=38289 PiperOrigin-RevId: 237873551 -- f348d2dc7087a990cbdfb95aa51fd7ff478ae40e by Samuel Benzaquen <sbenza@google.com>: Reduce minimum capacity to 1. This reduces memory usage for small tables. A flat_hash_set<int> of 1 element goes from 92 bytes to 24. A flat_hash_set<string> of 1 element goes from 512 bytes to 56. PiperOrigin-RevId: 237859811 -- 9c8125be5e4e5d22a7bb62bdec8c323338385c1b by Jon Cohen <cohenjon@google.com>: Bump to CMake 3.5. This is the oldest modern cmake being included by default in most popular OS distributions according to https://repology.org/project/cmake/versions. Specifically, Ubuntu LTS 16.04 uses cmake 3.5 (https://packages.ubuntu.com/xenial/cmake) PiperOrigin-RevId: 237859345 -- 07638d672e0a4dced986a62750cfd8318ed36ffa by Derek Mauro <dmauro@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 237714597 GitOrigin-RevId: 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb Change-Id: I5faecc45add4a5a774d4f9baf06e5519091f2ccc
2019-03-12 19:39:15 +01:00
}
#endif
Export of internal Abseil changes. -- 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb by Greg Falcon <gfalcon@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 238061818 -- 867a7ca318fac2991ea9a4107dbae3cc9fbf974a by Abseil Team <absl-team@google.com>: Added a IWYU export pragma when including a standard header for the purpose of aliasing its symbols. PiperOrigin-RevId: 238022277 -- 17047745058f2f151cd986ea9f649512542d3876 by Matt Armstrong <marmstrong@google.com>: Clarify the comment discouraging WrapUnique<T>(x) calls. PiperOrigin-RevId: 237873803 -- 3dcb2e4968243d33ca0ce53280c445df50f4a7ec by Samuel Benzaquen <sbenza@google.com>: Workaround clang bug https://bugs.llvm.org/show_bug.cgi?id=38289 PiperOrigin-RevId: 237873551 -- f348d2dc7087a990cbdfb95aa51fd7ff478ae40e by Samuel Benzaquen <sbenza@google.com>: Reduce minimum capacity to 1. This reduces memory usage for small tables. A flat_hash_set<int> of 1 element goes from 92 bytes to 24. A flat_hash_set<string> of 1 element goes from 512 bytes to 56. PiperOrigin-RevId: 237859811 -- 9c8125be5e4e5d22a7bb62bdec8c323338385c1b by Jon Cohen <cohenjon@google.com>: Bump to CMake 3.5. This is the oldest modern cmake being included by default in most popular OS distributions according to https://repology.org/project/cmake/versions. Specifically, Ubuntu LTS 16.04 uses cmake 3.5 (https://packages.ubuntu.com/xenial/cmake) PiperOrigin-RevId: 237859345 -- 07638d672e0a4dced986a62750cfd8318ed36ffa by Derek Mauro <dmauro@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 237714597 GitOrigin-RevId: 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb Change-Id: I5faecc45add4a5a774d4f9baf06e5519091f2ccc
2019-03-12 19:39:15 +01:00
return {seq.offset(mask.LowestBitSet()), seq.index()};
}
assert(seq.index() < capacity_ && "full table!");
seq.next();
}
}
// TODO(alkis): Optimize this assuming *this and that don't overlap.
raw_hash_set& move_assign(raw_hash_set&& that, std::true_type) {
raw_hash_set tmp(std::move(that));
swap(tmp);
return *this;
}
raw_hash_set& move_assign(raw_hash_set&& that, std::false_type) {
raw_hash_set tmp(std::move(that), alloc_ref());
swap(tmp);
return *this;
}
protected:
template <class K>
std::pair<size_t, bool> find_or_prepare_insert(const K& key) {
auto hash = hash_ref()(key);
auto seq = probe(hash);
while (true) {
Group g{ctrl_ + seq.offset()};
for (int i : g.Match(H2(hash))) {
if (ABSL_PREDICT_TRUE(PolicyTraits::apply(
EqualElement<K>{key, eq_ref()},
PolicyTraits::element(slots_ + seq.offset(i)))))
return {seq.offset(i), false};
}
if (ABSL_PREDICT_TRUE(g.MatchEmpty())) break;
seq.next();
}
return {prepare_insert(hash), true};
}
size_t prepare_insert(size_t hash) ABSL_ATTRIBUTE_NOINLINE {
Export of internal Abseil changes. -- 7fa1107161a03dac53fb84c2b06d8092616c7b13 by Abseil Team <absl-team@google.com>: Harden the generic stacktrace implementation for use during early program execution PiperOrigin-RevId: 226375950 -- 079f9969329f5eb66f647dd3c44b17541b1bf217 by Matt Kulukundis <kfm@google.com>: Workaround platforms that have over-aggressive warnings on -Wexit-time-destructors PiperOrigin-RevId: 226362948 -- 1447943f509be681ca5495add0162c750ef237f1 by Matt Kulukundis <kfm@google.com>: Switch from 64 to size_t atomics so they work on embedded platforms that do not have 64 bit atomics. PiperOrigin-RevId: 226210704 -- d14d49837ae2bcde74051e0c79c18ee0f43866b9 by Tom Manshreck <shreck@google.com>: Develop initial documentation for API breaking changes process: PiperOrigin-RevId: 226210021 -- 7ea3d7fe0e86979dab83a5fc9cc3bf1d6cb3bd53 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 226195522 -- 7de873e880d7f016a4fa1e08d626f0535cc470af by Abseil Team <absl-team@google.com>: Make Abseil LICENSE files newline terminated, with a single trailing blank line. Also remove line-ending whitespace. PiperOrigin-RevId: 226182949 -- 7d00643fadfad7f0d992c68bd9d2ed2e5bc960b0 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226045282 -- c4a0a11c0ce2875271191e477f3d36eaaeca4613 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226038273 -- 8ee4ebbb1ae5cda119e436e5ff7e3aa966608c10 by Matt Kulukundis <kfm@google.com>: Adds a global sampler which tracks a fraction of live tables for collecting telemetry data. PiperOrigin-RevId: 226032080 -- d576446f050518cd1b0ae447d682d8552f0e7e30 by Mark Barolak <mbar@google.com>: Replace an internal CaseEqual function with calls to the identical absl::EqualsIgnoreCase. This closes out a rather old TODO. PiperOrigin-RevId: 226024779 -- 6b23f1ee028a5ffa608c920424f1220a117a8f3d by Abseil Team <absl-team@google.com>: Add December 2018 LTS branch to list of LTS branches. PiperOrigin-RevId: 226011333 -- bb0833a43bdaef4c8c059b17bcd27ba9a085a114 by Mark Barolak <mbar@google.com>: Explicitly state that when the SimpleAtoi family of functions encounter an error, the value of their output parameter is unspecified. Also standardize the name of the output parameter to be `out`. PiperOrigin-RevId: 225997035 -- 46c1876b1a248eabda7545daa61a74a4cdfe9077 by Abseil Team <absl-team@google.com>: Remove deprecated CMake function absl_test, absl_library and absl_header_library PiperOrigin-RevId: 225950041 GitOrigin-RevId: 7fa1107161a03dac53fb84c2b06d8092616c7b13 Change-Id: I2ca9d3aada9292614527d1339a7557494139b806
2018-12-20 21:29:59 +01:00
auto target = find_first_non_full(hash);
if (ABSL_PREDICT_FALSE(growth_left() == 0 &&
!IsDeleted(ctrl_[target.offset]))) {
rehash_and_grow_if_necessary();
target = find_first_non_full(hash);
}
++size_;
Export of internal Abseil changes. -- 7fa1107161a03dac53fb84c2b06d8092616c7b13 by Abseil Team <absl-team@google.com>: Harden the generic stacktrace implementation for use during early program execution PiperOrigin-RevId: 226375950 -- 079f9969329f5eb66f647dd3c44b17541b1bf217 by Matt Kulukundis <kfm@google.com>: Workaround platforms that have over-aggressive warnings on -Wexit-time-destructors PiperOrigin-RevId: 226362948 -- 1447943f509be681ca5495add0162c750ef237f1 by Matt Kulukundis <kfm@google.com>: Switch from 64 to size_t atomics so they work on embedded platforms that do not have 64 bit atomics. PiperOrigin-RevId: 226210704 -- d14d49837ae2bcde74051e0c79c18ee0f43866b9 by Tom Manshreck <shreck@google.com>: Develop initial documentation for API breaking changes process: PiperOrigin-RevId: 226210021 -- 7ea3d7fe0e86979dab83a5fc9cc3bf1d6cb3bd53 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 226195522 -- 7de873e880d7f016a4fa1e08d626f0535cc470af by Abseil Team <absl-team@google.com>: Make Abseil LICENSE files newline terminated, with a single trailing blank line. Also remove line-ending whitespace. PiperOrigin-RevId: 226182949 -- 7d00643fadfad7f0d992c68bd9d2ed2e5bc960b0 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226045282 -- c4a0a11c0ce2875271191e477f3d36eaaeca4613 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226038273 -- 8ee4ebbb1ae5cda119e436e5ff7e3aa966608c10 by Matt Kulukundis <kfm@google.com>: Adds a global sampler which tracks a fraction of live tables for collecting telemetry data. PiperOrigin-RevId: 226032080 -- d576446f050518cd1b0ae447d682d8552f0e7e30 by Mark Barolak <mbar@google.com>: Replace an internal CaseEqual function with calls to the identical absl::EqualsIgnoreCase. This closes out a rather old TODO. PiperOrigin-RevId: 226024779 -- 6b23f1ee028a5ffa608c920424f1220a117a8f3d by Abseil Team <absl-team@google.com>: Add December 2018 LTS branch to list of LTS branches. PiperOrigin-RevId: 226011333 -- bb0833a43bdaef4c8c059b17bcd27ba9a085a114 by Mark Barolak <mbar@google.com>: Explicitly state that when the SimpleAtoi family of functions encounter an error, the value of their output parameter is unspecified. Also standardize the name of the output parameter to be `out`. PiperOrigin-RevId: 225997035 -- 46c1876b1a248eabda7545daa61a74a4cdfe9077 by Abseil Team <absl-team@google.com>: Remove deprecated CMake function absl_test, absl_library and absl_header_library PiperOrigin-RevId: 225950041 GitOrigin-RevId: 7fa1107161a03dac53fb84c2b06d8092616c7b13 Change-Id: I2ca9d3aada9292614527d1339a7557494139b806
2018-12-20 21:29:59 +01:00
growth_left() -= IsEmpty(ctrl_[target.offset]);
set_ctrl(target.offset, H2(hash));
infoz_.RecordInsert(hash, target.probe_length);
return target.offset;
}
// Constructs the value in the space pointed by the iterator. This only works
// after an unsuccessful find_or_prepare_insert() and before any other
// modifications happen in the raw_hash_set.
//
// PRECONDITION: i is an index returned from find_or_prepare_insert(k), where
// k is the key decomposed from `forward<Args>(args)...`, and the bool
// returned by find_or_prepare_insert(k) was true.
// POSTCONDITION: *m.iterator_at(i) == value_type(forward<Args>(args)...).
template <class... Args>
void emplace_at(size_t i, Args&&... args) {
PolicyTraits::construct(&alloc_ref(), slots_ + i,
std::forward<Args>(args)...);
assert(PolicyTraits::apply(FindElement{*this}, *iterator_at(i)) ==
iterator_at(i) &&
"constructed value does not match the lookup key");
}
iterator iterator_at(size_t i) { return {ctrl_ + i, slots_ + i}; }
const_iterator iterator_at(size_t i) const { return {ctrl_ + i, slots_ + i}; }
private:
friend struct RawHashSetTestOnlyAccess;
probe_seq<Group::kWidth> probe(size_t hash) const {
return probe_seq<Group::kWidth>(H1(hash, ctrl_), capacity_);
}
// Reset all ctrl bytes back to kEmpty, except the sentinel.
void reset_ctrl() {
std::memset(ctrl_, kEmpty, capacity_ + Group::kWidth);
ctrl_[capacity_] = kSentinel;
SanitizerPoisonMemoryRegion(slots_, sizeof(slot_type) * capacity_);
}
void reset_growth_left() {
growth_left() = CapacityToGrowth(capacity()) - size_;
}
// Sets the control byte, and if `i < Group::kWidth`, set the cloned byte at
// the end too.
void set_ctrl(size_t i, ctrl_t h) {
assert(i < capacity_);
if (IsFull(h)) {
SanitizerUnpoisonObject(slots_ + i);
} else {
SanitizerPoisonObject(slots_ + i);
}
ctrl_[i] = h;
Export of internal Abseil changes. -- 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb by Greg Falcon <gfalcon@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 238061818 -- 867a7ca318fac2991ea9a4107dbae3cc9fbf974a by Abseil Team <absl-team@google.com>: Added a IWYU export pragma when including a standard header for the purpose of aliasing its symbols. PiperOrigin-RevId: 238022277 -- 17047745058f2f151cd986ea9f649512542d3876 by Matt Armstrong <marmstrong@google.com>: Clarify the comment discouraging WrapUnique<T>(x) calls. PiperOrigin-RevId: 237873803 -- 3dcb2e4968243d33ca0ce53280c445df50f4a7ec by Samuel Benzaquen <sbenza@google.com>: Workaround clang bug https://bugs.llvm.org/show_bug.cgi?id=38289 PiperOrigin-RevId: 237873551 -- f348d2dc7087a990cbdfb95aa51fd7ff478ae40e by Samuel Benzaquen <sbenza@google.com>: Reduce minimum capacity to 1. This reduces memory usage for small tables. A flat_hash_set<int> of 1 element goes from 92 bytes to 24. A flat_hash_set<string> of 1 element goes from 512 bytes to 56. PiperOrigin-RevId: 237859811 -- 9c8125be5e4e5d22a7bb62bdec8c323338385c1b by Jon Cohen <cohenjon@google.com>: Bump to CMake 3.5. This is the oldest modern cmake being included by default in most popular OS distributions according to https://repology.org/project/cmake/versions. Specifically, Ubuntu LTS 16.04 uses cmake 3.5 (https://packages.ubuntu.com/xenial/cmake) PiperOrigin-RevId: 237859345 -- 07638d672e0a4dced986a62750cfd8318ed36ffa by Derek Mauro <dmauro@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 237714597 GitOrigin-RevId: 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb Change-Id: I5faecc45add4a5a774d4f9baf06e5519091f2ccc
2019-03-12 19:39:15 +01:00
ctrl_[((i - Group::kWidth) & capacity_) + 1 +
((Group::kWidth - 1) & capacity_)] = h;
}
size_t& growth_left() { return settings_.template get<0>(); }
Export of internal Abseil changes. -- 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb by Greg Falcon <gfalcon@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 238061818 -- 867a7ca318fac2991ea9a4107dbae3cc9fbf974a by Abseil Team <absl-team@google.com>: Added a IWYU export pragma when including a standard header for the purpose of aliasing its symbols. PiperOrigin-RevId: 238022277 -- 17047745058f2f151cd986ea9f649512542d3876 by Matt Armstrong <marmstrong@google.com>: Clarify the comment discouraging WrapUnique<T>(x) calls. PiperOrigin-RevId: 237873803 -- 3dcb2e4968243d33ca0ce53280c445df50f4a7ec by Samuel Benzaquen <sbenza@google.com>: Workaround clang bug https://bugs.llvm.org/show_bug.cgi?id=38289 PiperOrigin-RevId: 237873551 -- f348d2dc7087a990cbdfb95aa51fd7ff478ae40e by Samuel Benzaquen <sbenza@google.com>: Reduce minimum capacity to 1. This reduces memory usage for small tables. A flat_hash_set<int> of 1 element goes from 92 bytes to 24. A flat_hash_set<string> of 1 element goes from 512 bytes to 56. PiperOrigin-RevId: 237859811 -- 9c8125be5e4e5d22a7bb62bdec8c323338385c1b by Jon Cohen <cohenjon@google.com>: Bump to CMake 3.5. This is the oldest modern cmake being included by default in most popular OS distributions according to https://repology.org/project/cmake/versions. Specifically, Ubuntu LTS 16.04 uses cmake 3.5 (https://packages.ubuntu.com/xenial/cmake) PiperOrigin-RevId: 237859345 -- 07638d672e0a4dced986a62750cfd8318ed36ffa by Derek Mauro <dmauro@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 237714597 GitOrigin-RevId: 00d42e3d5433aaf29c2ed293520b2ba178ae8bdb Change-Id: I5faecc45add4a5a774d4f9baf06e5519091f2ccc
2019-03-12 19:39:15 +01:00
// The representation of the object has two modes:
// - small: For capacities < kWidth-1
// - large: For the rest.
//
// Differences:
// - In small mode we are able to use the whole capacity. The extra control
// bytes give us at least one "empty" control byte to stop the iteration.
// This is important to make 1 a valid capacity.
//
// - In small mode only the first `capacity()` control bytes after the
// sentinel are valid. The rest contain dummy kEmpty values that do not
// represent a real slot. This is important to take into account on
// find_first_non_full(), where we never try ShouldInsertBackwards() for
// small tables.
bool is_small() const { return capacity_ < Group::kWidth - 1; }
hasher& hash_ref() { return settings_.template get<1>(); }
const hasher& hash_ref() const { return settings_.template get<1>(); }
key_equal& eq_ref() { return settings_.template get<2>(); }
const key_equal& eq_ref() const { return settings_.template get<2>(); }
allocator_type& alloc_ref() { return settings_.template get<3>(); }
const allocator_type& alloc_ref() const {
return settings_.template get<3>();
}
// TODO(alkis): Investigate removing some of these fields:
// - ctrl/slots can be derived from each other
// - size can be moved into the slot array
ctrl_t* ctrl_ = EmptyGroup(); // [(capacity + 1) * ctrl_t]
slot_type* slots_ = nullptr; // [capacity * slot_type]
size_t size_ = 0; // number of full slots
size_t capacity_ = 0; // total number of slots
Export of internal Abseil changes. -- 7fa1107161a03dac53fb84c2b06d8092616c7b13 by Abseil Team <absl-team@google.com>: Harden the generic stacktrace implementation for use during early program execution PiperOrigin-RevId: 226375950 -- 079f9969329f5eb66f647dd3c44b17541b1bf217 by Matt Kulukundis <kfm@google.com>: Workaround platforms that have over-aggressive warnings on -Wexit-time-destructors PiperOrigin-RevId: 226362948 -- 1447943f509be681ca5495add0162c750ef237f1 by Matt Kulukundis <kfm@google.com>: Switch from 64 to size_t atomics so they work on embedded platforms that do not have 64 bit atomics. PiperOrigin-RevId: 226210704 -- d14d49837ae2bcde74051e0c79c18ee0f43866b9 by Tom Manshreck <shreck@google.com>: Develop initial documentation for API breaking changes process: PiperOrigin-RevId: 226210021 -- 7ea3d7fe0e86979dab83a5fc9cc3bf1d6cb3bd53 by Abseil Team <absl-team@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 226195522 -- 7de873e880d7f016a4fa1e08d626f0535cc470af by Abseil Team <absl-team@google.com>: Make Abseil LICENSE files newline terminated, with a single trailing blank line. Also remove line-ending whitespace. PiperOrigin-RevId: 226182949 -- 7d00643fadfad7f0d992c68bd9d2ed2e5bc960b0 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226045282 -- c4a0a11c0ce2875271191e477f3d36eaaeca4613 by Matt Kulukundis <kfm@google.com>: Internal cleanup PiperOrigin-RevId: 226038273 -- 8ee4ebbb1ae5cda119e436e5ff7e3aa966608c10 by Matt Kulukundis <kfm@google.com>: Adds a global sampler which tracks a fraction of live tables for collecting telemetry data. PiperOrigin-RevId: 226032080 -- d576446f050518cd1b0ae447d682d8552f0e7e30 by Mark Barolak <mbar@google.com>: Replace an internal CaseEqual function with calls to the identical absl::EqualsIgnoreCase. This closes out a rather old TODO. PiperOrigin-RevId: 226024779 -- 6b23f1ee028a5ffa608c920424f1220a117a8f3d by Abseil Team <absl-team@google.com>: Add December 2018 LTS branch to list of LTS branches. PiperOrigin-RevId: 226011333 -- bb0833a43bdaef4c8c059b17bcd27ba9a085a114 by Mark Barolak <mbar@google.com>: Explicitly state that when the SimpleAtoi family of functions encounter an error, the value of their output parameter is unspecified. Also standardize the name of the output parameter to be `out`. PiperOrigin-RevId: 225997035 -- 46c1876b1a248eabda7545daa61a74a4cdfe9077 by Abseil Team <absl-team@google.com>: Remove deprecated CMake function absl_test, absl_library and absl_header_library PiperOrigin-RevId: 225950041 GitOrigin-RevId: 7fa1107161a03dac53fb84c2b06d8092616c7b13 Change-Id: I2ca9d3aada9292614527d1339a7557494139b806
2018-12-20 21:29:59 +01:00
HashtablezInfoHandle infoz_;
absl::container_internal::CompressedTuple<size_t /* growth_left */, hasher,
key_equal, allocator_type>
settings_{0, hasher{}, key_equal{}, allocator_type{}};
};
namespace hashtable_debug_internal {
template <typename Set>
struct HashtableDebugAccess<Set, absl::void_t<typename Set::raw_hash_set>> {
using Traits = typename Set::PolicyTraits;
using Slot = typename Traits::slot_type;
static size_t GetNumProbes(const Set& set,
const typename Set::key_type& key) {
size_t num_probes = 0;
size_t hash = set.hash_ref()(key);
auto seq = set.probe(hash);
while (true) {
container_internal::Group g{set.ctrl_ + seq.offset()};
for (int i : g.Match(container_internal::H2(hash))) {
if (Traits::apply(
typename Set::template EqualElement<typename Set::key_type>{
key, set.eq_ref()},
Traits::element(set.slots_ + seq.offset(i))))
return num_probes;
++num_probes;
}
if (g.MatchEmpty()) return num_probes;
seq.next();
++num_probes;
}
}
static size_t AllocatedByteSize(const Set& c) {
size_t capacity = c.capacity_;
if (capacity == 0) return 0;
auto layout = Set::MakeLayout(capacity);
size_t m = layout.AllocSize();
size_t per_slot = Traits::space_used(static_cast<const Slot*>(nullptr));
if (per_slot != ~size_t{}) {
m += per_slot * c.size();
} else {
for (size_t i = 0; i != capacity; ++i) {
if (container_internal::IsFull(c.ctrl_[i])) {
m += Traits::space_used(c.slots_ + i);
}
}
}
return m;
}
static size_t LowerBoundAllocatedByteSize(size_t size) {
size_t capacity = GrowthToLowerboundCapacity(size);
if (capacity == 0) return 0;
auto layout = Set::MakeLayout(NormalizeCapacity(capacity));
size_t m = layout.AllocSize();
size_t per_slot = Traits::space_used(static_cast<const Slot*>(nullptr));
if (per_slot != ~size_t{}) {
m += per_slot * size;
}
return m;
}
};
} // namespace hashtable_debug_internal
} // namespace container_internal
} // namespace absl
#endif // ABSL_CONTAINER_INTERNAL_RAW_HASH_SET_H_