jdk

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/*
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 * Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "gc/shared/bufferNode.hpp"
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#include "utilities/debug.hpp"
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#include "memory/allocation.inline.hpp"
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#include <new>
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BufferNode::AllocatorConfig::AllocatorConfig(size_t size)
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  : _buffer_capacity(size)
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{
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  assert(size >= 1, "Invalid buffer capacity %zu", size);
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  assert(size <= max_size(), "Invalid buffer capacity %zu", size);
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}
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void* BufferNode::AllocatorConfig::allocate() {
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  size_t byte_size = buffer_capacity() * sizeof(void*);
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  return NEW_C_HEAP_ARRAY(char, buffer_offset() + byte_size, mtGC);
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}
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void BufferNode::AllocatorConfig::deallocate(void* node) {
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  assert(node != nullptr, "precondition");
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  FREE_C_HEAP_ARRAY(char, node);
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}
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BufferNode::Allocator::Allocator(const char* name, size_t buffer_capacity) :
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  _config(buffer_capacity),
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  _free_list(name, &_config)
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{}
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size_t BufferNode::Allocator::free_count() const {
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  return _free_list.free_count();
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}
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BufferNode* BufferNode::Allocator::allocate() {
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  auto internal_capacity = static_cast<InternalSizeType>(buffer_capacity());
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  return ::new (_free_list.allocate()) BufferNode(internal_capacity);
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}
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void BufferNode::Allocator::release(BufferNode* node) {
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  assert(node != nullptr, "precondition");
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  assert(node->next() == nullptr, "precondition");
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  assert(node->capacity() == buffer_capacity(),
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         "Wrong size %zu, expected %zu", node->capacity(), buffer_capacity());
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  node->~BufferNode();
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  _free_list.release(node);
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}
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