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-rw-r--r--absl/container/flat_hash_map.h9
-rw-r--r--absl/container/internal/container_memory.h36
-rw-r--r--absl/container/internal/hashtablez_sampler.h20
-rw-r--r--absl/container/internal/hashtablez_sampler_test.cc23
-rw-r--r--absl/container/internal/raw_hash_set.h16
-rw-r--r--absl/copts/AbseilConfigureCopts.cmake11
-rw-r--r--absl/debugging/CMakeLists.txt9
-rw-r--r--absl/hash/hash_test.cc30
-rw-r--r--absl/hash/internal/hash.h7
-rw-r--r--absl/memory/memory.h2
-rw-r--r--absl/strings/match.h4
-rw-r--r--absl/strings/str_split.h25
-rw-r--r--absl/utility/utility.h32
13 files changed, 170 insertions, 54 deletions
diff --git a/absl/container/flat_hash_map.h b/absl/container/flat_hash_map.h
index cc3d8b69..f6d28472 100644
--- a/absl/container/flat_hash_map.h
+++ b/absl/container/flat_hash_map.h
@@ -527,25 +527,26 @@ namespace container_internal {
template <class K, class V>
struct FlatHashMapPolicy {
- using slot_type = container_internal::slot_type<K, V>;
+ using slot_policy = container_internal::map_slot_policy<K, V>;
+ using slot_type = typename slot_policy::slot_type;
using key_type = K;
using mapped_type = V;
using init_type = std::pair</*non const*/ key_type, mapped_type>;
template <class Allocator, class... Args>
static void construct(Allocator* alloc, slot_type* slot, Args&&... args) {
- slot_type::construct(alloc, slot, std::forward<Args>(args)...);
+ slot_policy::construct(alloc, slot, std::forward<Args>(args)...);
}
template <class Allocator>
static void destroy(Allocator* alloc, slot_type* slot) {
- slot_type::destroy(alloc, slot);
+ slot_policy::destroy(alloc, slot);
}
template <class Allocator>
static void transfer(Allocator* alloc, slot_type* new_slot,
slot_type* old_slot) {
- slot_type::transfer(alloc, new_slot, old_slot);
+ slot_policy::transfer(alloc, new_slot, old_slot);
}
template <class F, class... Args>
diff --git a/absl/container/internal/container_memory.h b/absl/container/internal/container_memory.h
index 35b691ce..3a3f9703 100644
--- a/absl/container/internal/container_memory.h
+++ b/absl/container/internal/container_memory.h
@@ -311,7 +311,23 @@ struct IsLayoutCompatible {
// kMutableKeys. For C++11, the relevant section of the standard is
// https://timsong-cpp.github.io/cppwp/n3337/class.mem#19 (9.2.19)
template <class K, class V>
-union slot_type {
+union map_slot_type {
+ map_slot_type() {}
+ ~map_slot_type() = delete;
+ using value_type = std::pair<const K, V>;
+ using mutable_value_type = std::pair<K, V>;
+
+ value_type value;
+ mutable_value_type mutable_value;
+ K key;
+};
+
+template <class K, class V>
+struct map_slot_policy {
+ using slot_type = map_slot_type<K, V>;
+ using value_type = std::pair<const K, V>;
+ using mutable_value_type = std::pair<K, V>;
+
private:
static void emplace(slot_type* slot) {
// The construction of union doesn't do anything at runtime but it allows us
@@ -321,19 +337,17 @@ union slot_type {
// If pair<const K, V> and pair<K, V> are layout-compatible, we can accept one
// or the other via slot_type. We are also free to access the key via
// slot_type::key in this case.
- using kMutableKeys =
- std::integral_constant<bool,
- memory_internal::IsLayoutCompatible<K, V>::value>;
+ using kMutableKeys = memory_internal::IsLayoutCompatible<K, V>;
public:
- slot_type() {}
- ~slot_type() = delete;
- using value_type = std::pair<const K, V>;
- using mutable_value_type = std::pair<K, V>;
+ static value_type& element(slot_type* slot) { return slot->value; }
+ static const value_type& element(const slot_type* slot) {
+ return slot->value;
+ }
- value_type value;
- mutable_value_type mutable_value;
- K key;
+ static const K& key(const slot_type* slot) {
+ return kMutableKeys::value ? slot->key : slot->value.first;
+ }
template <class Allocator, class... Args>
static void construct(Allocator* alloc, slot_type* slot, Args&&... args) {
diff --git a/absl/container/internal/hashtablez_sampler.h b/absl/container/internal/hashtablez_sampler.h
index 8b81653a..e2d8f364 100644
--- a/absl/container/internal/hashtablez_sampler.h
+++ b/absl/container/internal/hashtablez_sampler.h
@@ -33,6 +33,7 @@
#include "absl/base/internal/per_thread_tls.h"
#include "absl/base/optimization.h"
+#include "absl/container/internal/have_sse.h"
#include "absl/synchronization/mutex.h"
#include "absl/utility/utility.h"
@@ -82,10 +83,24 @@ struct HashtablezInfo {
void* stack[kMaxStackDepth];
};
+inline void RecordRehashSlow(HashtablezInfo* info, size_t total_probe_length) {
+#if SWISSTABLE_HAVE_SSE2
+ total_probe_length /= 16;
+#else
+ total_probe_length /= 8;
+#endif
+ info->total_probe_length.store(total_probe_length, std::memory_order_relaxed);
+ info->num_erases.store(0, std::memory_order_relaxed);
+}
+
inline void RecordStorageChangedSlow(HashtablezInfo* info, size_t size,
size_t capacity) {
info->size.store(size, std::memory_order_relaxed);
info->capacity.store(capacity, std::memory_order_relaxed);
+ if (size == 0) {
+ // This is a clear, reset the total/num_erases too.
+ RecordRehashSlow(info, 0);
+ }
}
void RecordInsertSlow(HashtablezInfo* info, size_t hash,
@@ -126,6 +141,11 @@ class HashtablezInfoHandle {
RecordStorageChangedSlow(info_, size, capacity);
}
+ inline void RecordRehash(size_t total_probe_length) {
+ if (ABSL_PREDICT_TRUE(info_ == nullptr)) return;
+ RecordRehashSlow(info_, total_probe_length);
+ }
+
inline void RecordInsert(size_t hash, size_t distance_from_desired) {
if (ABSL_PREDICT_TRUE(info_ == nullptr)) return;
RecordInsertSlow(info_, hash, distance_from_desired);
diff --git a/absl/container/internal/hashtablez_sampler_test.cc b/absl/container/internal/hashtablez_sampler_test.cc
index f9ee941a..a6e4ac81 100644
--- a/absl/container/internal/hashtablez_sampler_test.cc
+++ b/absl/container/internal/hashtablez_sampler_test.cc
@@ -145,6 +145,29 @@ TEST(HashtablezInfoTest, RecordErase) {
EXPECT_EQ(info.num_erases.load(), 1);
}
+TEST(HashtablezInfoTest, RecordRehash) {
+ HashtablezInfo info;
+ absl::MutexLock l(&info.init_mu);
+ info.PrepareForSampling();
+ RecordInsertSlow(&info, 0x1, 0);
+ RecordInsertSlow(&info, 0x2, kProbeLength);
+ RecordInsertSlow(&info, 0x4, kProbeLength);
+ RecordInsertSlow(&info, 0x8, 2 * kProbeLength);
+ EXPECT_EQ(info.size.load(), 4);
+ EXPECT_EQ(info.total_probe_length.load(), 4);
+
+ RecordEraseSlow(&info);
+ RecordEraseSlow(&info);
+ EXPECT_EQ(info.size.load(), 2);
+ EXPECT_EQ(info.total_probe_length.load(), 4);
+ EXPECT_EQ(info.num_erases.load(), 2);
+
+ RecordRehashSlow(&info, 3 * kProbeLength);
+ EXPECT_EQ(info.size.load(), 2);
+ EXPECT_EQ(info.total_probe_length.load(), 3);
+ EXPECT_EQ(info.num_erases.load(), 0);
+}
+
TEST(HashtablezSamplerTest, SmallSampleParameter) {
SetHashtablezEnabled(true);
SetHashtablezSampleParameter(100);
diff --git a/absl/container/internal/raw_hash_set.h b/absl/container/internal/raw_hash_set.h
index a5d0cae0..33f8f8fa 100644
--- a/absl/container/internal/raw_hash_set.h
+++ b/absl/container/internal/raw_hash_set.h
@@ -936,7 +936,7 @@ class raw_hash_set {
reset_growth_left();
}
assert(empty());
- infoz_.RecordStorageChanged(size_, capacity_);
+ infoz_.RecordStorageChanged(0, capacity_);
}
// This overload kicks in when the argument is an rvalue of insertable and
@@ -1226,7 +1226,7 @@ class raw_hash_set {
if (n == 0 && capacity_ == 0) return;
if (n == 0 && size_ == 0) {
destroy_slots();
- infoz_.RecordStorageChanged(size_, capacity_);
+ infoz_.RecordStorageChanged(0, 0);
return;
}
// bitor is a faster way of doing `max` here. We will round up to the next
@@ -1483,11 +1483,14 @@ class raw_hash_set {
capacity_ = new_capacity;
initialize_slots();
+ 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));
- size_t new_i = find_first_non_full(hash).offset;
+ 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);
}
@@ -1499,6 +1502,7 @@ class raw_hash_set {
Deallocate<Layout::Alignment()>(&alloc_ref(), old_ctrl,
layout.AllocSize());
}
+ infoz_.RecordRehash(total_probe_length);
}
void drop_deletes_without_resize() ABSL_ATTRIBUTE_NOINLINE {
@@ -1522,12 +1526,15 @@ class raw_hash_set {
ConvertDeletedToEmptyAndFullToDeleted(ctrl_, capacity_);
typename std::aligned_storage<sizeof(slot_type), alignof(slot_type)>::type
raw;
+ 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));
- size_t new_i = find_first_non_full(hash).offset;
+ 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
@@ -1560,6 +1567,7 @@ class raw_hash_set {
}
}
reset_growth_left();
+ infoz_.RecordRehash(total_probe_length);
}
void rehash_and_grow_if_necessary() {
diff --git a/absl/copts/AbseilConfigureCopts.cmake b/absl/copts/AbseilConfigureCopts.cmake
index 6fde7754..f68895d9 100644
--- a/absl/copts/AbseilConfigureCopts.cmake
+++ b/absl/copts/AbseilConfigureCopts.cmake
@@ -1,6 +1,9 @@
# See absl/copts/copts.py and absl/copts/generate_copts.py
include(GENERATED_AbseilCopts)
+set(ABSL_LSAN_LINKOPTS "")
+set(ABSL_HAVE_LSAN OFF)
+
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
set(ABSL_DEFAULT_COPTS "${GCC_FLAGS}")
set(ABSL_TEST_COPTS "${GCC_FLAGS};${GCC_TEST_FLAGS}")
@@ -10,6 +13,14 @@ elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
set(ABSL_DEFAULT_COPTS "${LLVM_FLAGS}")
set(ABSL_TEST_COPTS "${LLVM_FLAGS};${LLVM_TEST_FLAGS}")
set(ABSL_EXCEPTIONS_FLAG "${LLVM_EXCEPTIONS_FLAGS}")
+ if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+ # AppleClang doesn't have lsan
+ # https://developer.apple.com/documentation/code_diagnostics
+ if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 3.5)
+ set(ABSL_LSAN_LINKOPTS "-fsanitize=leak")
+ set(ABSL_HAVE_LSAN ON)
+ endif()
+ endif()
elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
set(ABSL_DEFAULT_COPTS "${MSVC_FLAGS}")
set(ABSL_TEST_COPTS "${MSVC_FLAGS};${MSVC_TEST_FLAGS}")
diff --git a/absl/debugging/CMakeLists.txt b/absl/debugging/CMakeLists.txt
index 4c1fc508..34511521 100644
--- a/absl/debugging/CMakeLists.txt
+++ b/absl/debugging/CMakeLists.txt
@@ -199,11 +199,6 @@ absl_cc_library(
PUBLIC
)
-# TODO(cohenjon) Move into the copts code.
-if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
- set(ABSL_LSAN_LINKOPTS "-fsanitize=leak")
-endif()
-
absl_cc_library(
NAME
leak_check_api_enabled_for_testing
@@ -212,7 +207,7 @@ absl_cc_library(
SRCS
"leak_check.cc"
COPTS
- $<$<BOOL:${ABSL_USING_CLANG}>:-DLEAK_SANITIZER>
+ $<$<BOOL:${ABSL_HAVE_LSAN}>:-DLEAK_SANITIZER>
TESTONLY
)
@@ -234,7 +229,7 @@ absl_cc_test(
SRCS
"leak_check_test.cc"
COPTS
- "$<$<CXX_COMPILER_ID:Clang>:-DABSL_EXPECT_LEAK_SANITIZER>"
+ "$<$<BOOL:${ABSL_HAVE_LSAN}>:-DABSL_EXPECT_LEAK_SANITIZER>"
LINKOPTS
"${ABSL_LSAN_LINKOPTS}"
DEPS
diff --git a/absl/hash/hash_test.cc b/absl/hash/hash_test.cc
index a5af93ad..2c9e46b7 100644
--- a/absl/hash/hash_test.cc
+++ b/absl/hash/hash_test.cc
@@ -135,6 +135,36 @@ TEST(HashValueTest, Pointer) {
std::make_tuple(&i, ptr, nullptr, ptr + 1, n)));
}
+TEST(HashValueTest, PointerAlignment) {
+ // We want to make sure that pointer alignment will not cause bits to be
+ // stuck.
+
+ constexpr size_t kTotalSize = 1 << 20;
+ std::unique_ptr<char[]> data(new char[kTotalSize]);
+ constexpr size_t kLog2NumValues = 5;
+ constexpr size_t kNumValues = 1 << kLog2NumValues;
+
+ for (size_t align = 1; align < kTotalSize / kNumValues;
+ align < 8 ? align += 1 : align < 1024 ? align += 8 : align += 32) {
+ SCOPED_TRACE(align);
+ ASSERT_LE(align * kNumValues, kTotalSize);
+
+ size_t bits_or = 0;
+ size_t bits_and = ~size_t{};
+
+ for (size_t i = 0; i < kNumValues; ++i) {
+ size_t hash = absl::Hash<void*>()(data.get() + i * align);
+ bits_or |= hash;
+ bits_and &= hash;
+ }
+
+ // Limit the scope to the bits we would be using for Swisstable.
+ constexpr size_t kMask = (1 << (kLog2NumValues + 7)) - 1;
+ size_t stuck_bits = (~bits_or | bits_and) & kMask;
+ EXPECT_EQ(stuck_bits, 0) << "0x" << std::hex << stuck_bits;
+ }
+}
+
// TODO(EricWF): MSVC 15 has a bug that causes it to incorrectly evaluate the
// SFINAE in internal/hash.h, causing this test to fail.
#if !defined(_MSC_VER)
diff --git a/absl/hash/internal/hash.h b/absl/hash/internal/hash.h
index ba6d7468..bd07677a 100644
--- a/absl/hash/internal/hash.h
+++ b/absl/hash/internal/hash.h
@@ -264,7 +264,12 @@ H AbslHashValue(H hash_state, long double value) {
// AbslHashValue() for hashing pointers
template <typename H, typename T>
H AbslHashValue(H hash_state, T* ptr) {
- return hash_internal::hash_bytes(std::move(hash_state), ptr);
+ auto v = reinterpret_cast<uintptr_t>(ptr);
+ // Due to alignment, pointers tend to have low bits as zero, and the next few
+ // bits follow a pattern since they are also multiples of some base value.
+ // Mixing the pointer twice helps prevent stuck low bits for certain alignment
+ // values.
+ return H::combine(std::move(hash_state), v, v);
}
// AbslHashValue() for hashing nullptr_t
diff --git a/absl/memory/memory.h b/absl/memory/memory.h
index 8bf4fe82..75506a74 100644
--- a/absl/memory/memory.h
+++ b/absl/memory/memory.h
@@ -646,7 +646,7 @@ struct allocator_is_nothrow
: memory_internal::ExtractOrT<memory_internal::GetIsNothrow, Alloc,
std::false_type> {};
-#if ABSL_ALLOCATOR_NOTHROW
+#if defined(ABSL_ALLOCATOR_NOTHROW) && ABSL_ALLOCATOR_NOTHROW
template <typename T>
struct allocator_is_nothrow<std::allocator<T>> : std::true_type {};
struct default_allocator_is_nothrow : std::true_type {};
diff --git a/absl/strings/match.h b/absl/strings/match.h
index 6e8ed10f..3a4fefd9 100644
--- a/absl/strings/match.h
+++ b/absl/strings/match.h
@@ -74,13 +74,13 @@ bool EqualsIgnoreCase(absl::string_view piece1, absl::string_view piece2);
// StartsWithIgnoreCase()
//
-// Returns whether a given ASCII string `text` starts with `starts_with`,
+// Returns whether a given ASCII string `text` starts with `prefix`,
// ignoring case in the comparison.
bool StartsWithIgnoreCase(absl::string_view text, absl::string_view prefix);
// EndsWithIgnoreCase()
//
-// Returns whether a given ASCII string `text` ends with `ends_with`, ignoring
+// Returns whether a given ASCII string `text` ends with `suffix`, ignoring
// case in the comparison.
bool EndsWithIgnoreCase(absl::string_view text, absl::string_view suffix);
diff --git a/absl/strings/str_split.h b/absl/strings/str_split.h
index 485f2435..86effd30 100644
--- a/absl/strings/str_split.h
+++ b/absl/strings/str_split.h
@@ -72,22 +72,23 @@ namespace absl {
// - `MaxSplits`
//
//
-// A Delimiter's Find() member function will be passed the input text that is to
-// be split and the position to begin searching for the next delimiter in the
-// input text. The returned absl::string_view should refer to the next
-// occurrence (after pos) of the represented delimiter; this returned
-// absl::string_view represents the next location where the input string should
-// be broken. The returned absl::string_view may be zero-length if the Delimiter
-// does not represent a part of the string (e.g., a fixed-length delimiter). If
-// no delimiter is found in the given text, a zero-length absl::string_view
-// referring to text.end() should be returned (e.g.,
-// absl::string_view(text.end(), 0)). It is important that the returned
-// absl::string_view always be within the bounds of input text given as an
+// A Delimiter's `Find()` member function will be passed an input `text` that is
+// to be split and a position (`pos`) to begin searching for the next delimiter
+// in `text`. The returned absl::string_view should refer to the next occurrence
+// (after `pos`) of the represented delimiter; this returned absl::string_view
+// represents the next location where the input `text` should be broken.
+//
+// The returned absl::string_view may be zero-length if the Delimiter does not
+// represent a part of the string (e.g., a fixed-length delimiter). If no
+// delimiter is found in the input `text`, a zero-length absl::string_view
+// referring to `text.end()` should be returned (e.g.,
+// `text.substr(text.size())`). It is important that the returned
+// absl::string_view always be within the bounds of the input `text` given as an
// argument--it must not refer to a string that is physically located outside of
// the given string.
//
// The following example is a simple Delimiter object that is created with a
-// single char and will look for that char in the text passed to the Find()
+// single char and will look for that char in the text passed to the `Find()`
// function:
//
// struct SimpleDelimiter {
diff --git a/absl/utility/utility.h b/absl/utility/utility.h
index aef4baa0..104ec829 100644
--- a/absl/utility/utility.h
+++ b/absl/utility/utility.h
@@ -234,25 +234,33 @@ auto apply_helper(Functor&& functor, Tuple&& t, index_sequence<Indexes...>)
//
// Example:
//
-// class Foo{void Bar(int);};
-// void user_function(int, string);
-// void user_function(std::unique_ptr<Foo>);
+// class Foo {
+// public:
+// void Bar(int);
+// };
+// void user_function1(int, string);
+// void user_function2(std::unique_ptr<Foo>);
+// auto user_lambda = [](int, int) {};
//
// int main()
// {
// std::tuple<int, string> tuple1(42, "bar");
-// // Invokes the user function overload on int, string.
-// absl::apply(&user_function, tuple1);
+// // Invokes the first user function on int, string.
+// absl::apply(&user_function1, tuple1);
//
-// auto foo = absl::make_unique<Foo>();
-// std::tuple<Foo*, int> tuple2(foo.get(), 42);
-// // Invokes the method Bar on foo with one argument 42.
-// absl::apply(&Foo::Bar, foo.get(), 42);
-//
-// std::tuple<std::unique_ptr<Foo>> tuple3(absl::make_unique<Foo>());
+// std::tuple<std::unique_ptr<Foo>> tuple2(absl::make_unique<Foo>());
// // Invokes the user function that takes ownership of the unique
// // pointer.
-// absl::apply(&user_function, std::move(tuple));
+// absl::apply(&user_function2, std::move(tuple2));
+//
+// auto foo = absl::make_unique<Foo>();
+// std::tuple<Foo*, int> tuple3(foo.get(), 42);
+// // Invokes the method Bar on foo with one argument, 42.
+// absl::apply(&Foo::Bar, tuple3);
+//
+// std::tuple<int, int> tuple4(8, 9);
+// // Invokes a lambda.
+// absl::apply(user_lambda, tuple4);
// }
template <typename Functor, typename Tuple>
auto apply(Functor&& functor, Tuple&& t)
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 13:51:38 +0000