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authorGravatar Abseil Team <absl-team@google.com>2019-07-25 04:03:57 -0700
committerGravatar Andy Getz <durandal@google.com>2019-07-25 18:02:32 -0400
commit36d37ab992038f52276ca66b9da80c1cf0f57dc2 (patch)
tree85b41d7f9cbe30df2e389130a94e0e5a54674b54 /absl/container/internal
parentad1485c8986246b2ae9105e512738d0e97aec887 (diff)
Export of internal Abseil changes.
-- 1224e58a45e4d016b18f5a6cf5762ba33027017a by CJ Johnson <johnsoncj@google.com>: Unifies the growth factor of InlinedVector's mutating members to max(2 * capacity, req_capacity). In doing so, LegacyNextCapacityFrom(...) is removed thus removing a loop from several callsites. PiperOrigin-RevId: 259920301 -- 945fc0bf27b67ea77d39144dcb6a483dc879ceda by Laramie Leavitt <lar@google.com>: Cleanup header guards which do not reflect the correct style. PiperOrigin-RevId: 259881520 -- 8c7d0532ba9a9aabfd57f67552572b2b1bedda97 by Derek Mauro <dmauro@google.com>: Move log_severity sources to the new log_severity target. PiperOrigin-RevId: 259837015 GitOrigin-RevId: 1224e58a45e4d016b18f5a6cf5762ba33027017a Change-Id: Id19506c3b8db71a0d4391ee917bfef3e802d550d
Diffstat (limited to 'absl/container/internal')
-rw-r--r--absl/container/internal/inlined_vector.h89
1 files changed, 52 insertions, 37 deletions
diff --git a/absl/container/internal/inlined_vector.h b/absl/container/internal/inlined_vector.h
index 7954b2b5..b241d0e0 100644
--- a/absl/container/internal/inlined_vector.h
+++ b/absl/container/internal/inlined_vector.h
@@ -15,6 +15,7 @@
#ifndef ABSL_CONTAINER_INTERNAL_INLINED_VECTOR_INTERNAL_H_
#define ABSL_CONTAINER_INTERNAL_INLINED_VECTOR_INTERNAL_H_
+#include <algorithm>
#include <cstddef>
#include <cstring>
#include <iterator>
@@ -301,15 +302,17 @@ class Storage {
return data_.allocated.allocated_data;
}
+ size_type GetInlinedCapacity() const { return static_cast<size_type>(N); }
+
size_type GetAllocatedCapacity() const {
return data_.allocated.allocated_capacity;
}
StorageView MakeStorageView() {
- return GetIsAllocated() ? StorageView{GetAllocatedData(), GetSize(),
- GetAllocatedCapacity()}
- : StorageView{GetInlinedData(), GetSize(),
- static_cast<size_type>(N)};
+ return GetIsAllocated()
+ ? StorageView{GetAllocatedData(), GetSize(),
+ GetAllocatedCapacity()}
+ : StorageView{GetInlinedData(), GetSize(), GetInlinedCapacity()};
}
allocator_type* GetAllocPtr() {
@@ -402,18 +405,13 @@ class Storage {
return metadata_.template get<1>();
}
- static size_type NextCapacityFrom(size_type current_capacity) {
+ static size_type NextCapacity(size_type current_capacity) {
return current_capacity * 2;
}
- static size_type LegacyNextCapacityFrom(size_type current_capacity,
- size_type requested_capacity) {
- // TODO(johnsoncj): Get rid of this old behavior.
- size_type new_capacity = current_capacity;
- while (new_capacity < requested_capacity) {
- new_capacity *= 2;
- }
- return new_capacity;
+ static size_type ComputeCapacity(size_type current_capacity,
+ size_type requested_capacity) {
+ return (std::max)(NextCapacity(current_capacity), requested_capacity);
}
using Metadata =
@@ -449,13 +447,17 @@ auto Storage<T, N, A>::Initialize(ValueAdapter values, size_type new_size)
pointer construct_data;
- if (new_size > static_cast<size_type>(N)) {
+ if (new_size > GetInlinedCapacity()) {
// Because this is only called from the `InlinedVector` constructors, it's
// safe to take on the allocation with size `0`. If `ConstructElements(...)`
// throws, deallocation will be automatically handled by `~Storage()`.
- construct_data = AllocatorTraits::allocate(*GetAllocPtr(), new_size);
- SetAllocatedData(construct_data, new_size);
+ size_type new_capacity = ComputeCapacity(GetInlinedCapacity(), new_size);
+ pointer new_data = AllocatorTraits::allocate(*GetAllocPtr(), new_capacity);
+
+ SetAllocatedData(new_data, new_capacity);
SetIsAllocated();
+
+ construct_data = new_data;
} else {
construct_data = GetInlinedData();
}
@@ -481,7 +483,10 @@ auto Storage<T, N, A>::Assign(ValueAdapter values, size_type new_size) -> void {
absl::Span<value_type> destroy_loop;
if (new_size > storage_view.capacity) {
- construct_loop = {allocation_tx.Allocate(new_size), new_size};
+ size_type new_capacity = ComputeCapacity(storage_view.capacity, new_size);
+ pointer new_data = allocation_tx.Allocate(new_capacity);
+
+ construct_loop = {new_data, new_size};
destroy_loop = {storage_view.data, storage_view.size};
} else if (new_size > storage_view.size) {
assign_loop = {storage_view.data, storage_view.size};
@@ -526,8 +531,8 @@ auto Storage<T, N, A>::Resize(ValueAdapter values, size_type new_size) -> void {
absl::Span<value_type> destroy_loop;
if (new_size > storage_view.capacity) {
- pointer new_data = allocation_tx.Allocate(
- LegacyNextCapacityFrom(storage_view.capacity, new_size));
+ size_type new_capacity = ComputeCapacity(storage_view.capacity, new_size);
+ pointer new_data = allocation_tx.Allocate(new_capacity);
// Construct new objects in `new_data`
construct_loop = {new_data + storage_view.size,
@@ -586,8 +591,8 @@ auto Storage<T, N, A>::Insert(const_iterator pos, ValueAdapter values,
IteratorValueAdapter<MoveIterator> move_values(
MoveIterator(storage_view.data));
- pointer new_data = allocation_tx.Allocate(
- LegacyNextCapacityFrom(storage_view.capacity, new_size));
+ size_type new_capacity = ComputeCapacity(storage_view.capacity, new_size);
+ pointer new_data = allocation_tx.Allocate(new_capacity);
construction_tx.Construct(new_data + insert_index, &values, insert_count);
@@ -670,14 +675,20 @@ auto Storage<T, N, A>::EmplaceBack(Args&&... args) -> reference {
IteratorValueAdapter<MoveIterator> move_values(
MoveIterator(storage_view.data));
- pointer construct_data =
- (storage_view.size == storage_view.capacity
- ? allocation_tx.Allocate(NextCapacityFrom(storage_view.capacity))
- : storage_view.data);
+ pointer construct_data;
- pointer last_ptr = construct_data + storage_view.size;
- AllocatorTraits::construct(*GetAllocPtr(), last_ptr,
- std::forward<Args>(args)...);
+ if (storage_view.size == storage_view.capacity) {
+ size_type new_capacity = NextCapacity(storage_view.capacity);
+ pointer new_data = allocation_tx.Allocate(new_capacity);
+
+ construct_data = new_data;
+ } else {
+ construct_data = storage_view.data;
+ }
+
+ pointer end = construct_data + storage_view.size;
+
+ AllocatorTraits::construct(*GetAllocPtr(), end, std::forward<Args>(args)...);
if (allocation_tx.DidAllocate()) {
ABSL_INTERNAL_TRY {
@@ -686,7 +697,7 @@ auto Storage<T, N, A>::EmplaceBack(Args&&... args) -> reference {
storage_view.size);
}
ABSL_INTERNAL_CATCH_ANY {
- AllocatorTraits::destroy(*GetAllocPtr(), last_ptr);
+ AllocatorTraits::destroy(*GetAllocPtr(), end);
ABSL_INTERNAL_RETHROW;
}
@@ -699,7 +710,7 @@ auto Storage<T, N, A>::EmplaceBack(Args&&... args) -> reference {
}
AddSize(1);
- return *last_ptr;
+ return *end;
}
template <typename T, size_t N, typename A>
@@ -740,8 +751,9 @@ auto Storage<T, N, A>::Reserve(size_type requested_capacity) -> void {
IteratorValueAdapter<MoveIterator> move_values(
MoveIterator(storage_view.data));
- pointer new_data = allocation_tx.Allocate(
- LegacyNextCapacityFrom(storage_view.capacity, requested_capacity));
+ size_type new_capacity =
+ ComputeCapacity(storage_view.capacity, requested_capacity);
+ pointer new_data = allocation_tx.Allocate(new_capacity);
inlined_vector_internal::ConstructElements(GetAllocPtr(), new_data,
&move_values, storage_view.size);
@@ -762,6 +774,8 @@ auto Storage<T, N, A>::ShrinkToFit() -> void {
StorageView storage_view{GetAllocatedData(), GetSize(),
GetAllocatedCapacity()};
+ if (ABSL_PREDICT_FALSE(storage_view.size == storage_view.capacity)) return;
+
AllocationTransaction allocation_tx(GetAllocPtr());
IteratorValueAdapter<MoveIterator> move_values(
@@ -769,12 +783,13 @@ auto Storage<T, N, A>::ShrinkToFit() -> void {
pointer construct_data;
- if (storage_view.size <= static_cast<size_type>(N)) {
- construct_data = GetInlinedData();
- } else if (storage_view.size < GetAllocatedCapacity()) {
- construct_data = allocation_tx.Allocate(storage_view.size);
+ if (storage_view.size > GetInlinedCapacity()) {
+ size_type new_capacity = storage_view.size;
+ pointer new_data = allocation_tx.Allocate(new_capacity);
+
+ construct_data = new_data;
} else {
- return;
+ construct_data = GetInlinedData();
}
ABSL_INTERNAL_TRY {