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115 lines
3.4 KiB
C++
115 lines
3.4 KiB
C++
/*
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* Copyright (c) 1997, 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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#ifndef SHARE_MEMORY_ALLOCATION_INLINE_HPP
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#define SHARE_MEMORY_ALLOCATION_INLINE_HPP
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#include "memory/allocation.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/globals.hpp"
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#include "runtime/os.hpp"
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#include "utilities/align.hpp"
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#include "utilities/globalDefinitions.hpp"
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// Explicit C-heap memory management
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#ifndef PRODUCT
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// Increments unsigned long value for statistics (not atomic on MP, but avoids word-tearing on 32 bit).
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inline void inc_stat_counter(volatile julong* dest, julong add_value) {
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#ifdef _LP64
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*dest += add_value;
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#else
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julong value = Atomic::load(dest);
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Atomic::store(dest, value + add_value);
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#endif
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}
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#endif
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template <class E>
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size_t MmapArrayAllocator<E>::size_for(size_t length) {
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size_t size = length * sizeof(E);
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size_t alignment = os::vm_allocation_granularity();
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return align_up(size, alignment);
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}
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template <class E>
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E* MmapArrayAllocator<E>::allocate_or_null(size_t length, MEMFLAGS flags) {
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size_t size = size_for(length);
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char* addr = os::reserve_memory(size, !ExecMem, flags);
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if (addr == nullptr) {
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return nullptr;
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}
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if (os::commit_memory(addr, size, !ExecMem)) {
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return (E*)addr;
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} else {
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os::release_memory(addr, size);
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return nullptr;
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}
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}
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template <class E>
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E* MmapArrayAllocator<E>::allocate(size_t length, MEMFLAGS flags) {
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size_t size = size_for(length);
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char* addr = os::reserve_memory(size, !ExecMem, flags);
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if (addr == nullptr) {
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vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "Allocator (reserve)");
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}
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os::commit_memory_or_exit(addr, size, !ExecMem, "Allocator (commit)");
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return (E*)addr;
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}
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template <class E>
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void MmapArrayAllocator<E>::free(E* addr, size_t length) {
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bool result = os::release_memory((char*)addr, size_for(length));
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assert(result, "Failed to release memory");
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}
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template <class E>
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size_t MallocArrayAllocator<E>::size_for(size_t length) {
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return length * sizeof(E);
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}
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template <class E>
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E* MallocArrayAllocator<E>::allocate(size_t length, MEMFLAGS flags) {
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return (E*)AllocateHeap(size_for(length), flags);
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}
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template <class E>
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E* MallocArrayAllocator<E>::reallocate(E* addr, size_t new_length, MEMFLAGS flags) {
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return (E*)ReallocateHeap((char*)addr, size_for(new_length), flags);
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}
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template <class E>
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void MallocArrayAllocator<E>::free(E* addr) {
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FreeHeap(addr);
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}
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#endif // SHARE_MEMORY_ALLOCATION_INLINE_HPP
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