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/* Copyright (C) 2011-2021 Free Software Foundation, Inc.
Contributed by Torvald Riegel <triegel@redhat.com>.
This file is part of the GNU Transactional Memory Library (libitm).
Libitm is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#ifndef LIBITM_CONTAINERS_H
#define LIBITM_CONTAINERS_H 1
#include "common.h"
namespace GTM HIDDEN {
// A simple vector-like container.
// If alloc_seperate_cl is true, allocations will happen on separate cache
// lines.
template <typename T, bool alloc_separate_cl = true>
class vector
{
private:
size_t m_capacity;
size_t m_size;
T* entries;
// Initial capacity of the vector.
static const size_t default_initial_capacity = 32;
// Above that capacity, grow vector by that size for each call.
static const size_t default_resize_max = 2048;
// Resize vector to at least this capacity.
static const size_t default_resize_min = 32;
// Don't try to copy this vector.
vector<T, alloc_separate_cl>(const vector<T, alloc_separate_cl>& x);
public:
typedef T datatype;
typedef T* iterator;
iterator begin() const { return entries; }
iterator end() const { return entries + m_size; }
T& operator[] (size_t pos) { return entries[pos]; }
const T& operator[] (size_t pos) const { return entries[pos]; }
vector<T, alloc_separate_cl>(size_t initial_size = default_initial_capacity)
: m_capacity(initial_size),
m_size(0)
{
if (m_capacity > 0)
entries = (T*) xmalloc(sizeof(T) * m_capacity, alloc_separate_cl);
else
entries = 0;
}
~vector<T, alloc_separate_cl>() { if (m_capacity) free(entries); }
void resize(size_t additional_capacity)
{
size_t target = m_capacity + additional_capacity;
if (target > default_resize_max)
m_capacity = ((target - 1 + default_resize_max) / default_resize_max)
* default_resize_max;
else
while (m_capacity < target)
m_capacity = m_capacity * 2;
if (m_capacity < default_resize_min)
m_capacity = default_resize_min;
entries = (T*) xrealloc(entries, sizeof(T) * m_capacity, alloc_separate_cl);
}
void resize_noinline() __attribute__((noinline)) { resize(1); }
void resize_noinline(size_t elements) __attribute__((noinline))
{
resize(elements);
}
size_t size() const { return m_size; }
size_t capacity() const { return this->capacity; }
void set_size (size_t size) { m_size = size; }
void clear() { m_size = 0; }
iterator push() {
// We don't want inlining here since push() is often on the fast path.
if (unlikely(m_size == m_capacity)) resize_noinline();
return &entries[m_size++];
}
iterator push(size_t elements)
{
// We don't want inlining here since push() is often on the fast path.
if (unlikely(m_size + elements > m_capacity)) resize_noinline(elements);
iterator it = &entries[m_size];
m_size += elements;
return it;
}
iterator pop() {
if (likely(m_size > 0))
{
m_size--;
return entries + m_size;
}
else return 0;
}
};
} // namespace GTM
#endif // LIBITM_CONTAINERS_H
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