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95 lines
2.9 KiB
C++
95 lines
2.9 KiB
C++
/*
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* Copyright (c) 1997, 2024, 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_OOPS_OBJARRAYOOP_HPP
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#define SHARE_OOPS_OBJARRAYOOP_HPP
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#include "oops/arrayOop.hpp"
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#include "utilities/align.hpp"
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#include <type_traits>
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class Klass;
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// An objArrayOop is an array containing oops.
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// Evaluating "String arg[10]" will create an objArrayOop.
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class objArrayOopDesc : public arrayOopDesc {
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friend class ArchiveHeapWriter;
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friend class ObjArrayKlass;
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friend class Runtime1;
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friend class psPromotionManager;
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friend class CSetMarkWordClosure;
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friend class Continuation;
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template <typename T>
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friend class RawOopWriter;
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template <class T> T* obj_at_addr(int index) const;
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template <class T>
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static ptrdiff_t obj_at_offset(int index) {
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return base_offset_in_bytes() + sizeof(T) * index;
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}
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public:
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// Returns the offset of the first element.
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static int base_offset_in_bytes() {
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return arrayOopDesc::base_offset_in_bytes(T_OBJECT);
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}
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// base is the address following the header.
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HeapWord* base() const;
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// Accessing
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oop obj_at(int index) const;
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void obj_at_put(int index, oop value);
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oop replace_if_null(int index, oop exchange_value);
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// Sizing
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size_t object_size() { return object_size(length()); }
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static size_t object_size(int length) {
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// This returns the object size in HeapWords.
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size_t asz = (size_t)length * heapOopSize;
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size_t size_words = heap_word_size(base_offset_in_bytes() + asz);
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size_t osz = align_object_size(size_words);
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assert(osz < max_jint, "no overflow");
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return osz;
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}
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Klass* element_klass();
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public:
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// special iterators for index ranges, returns size of object
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template <typename OopClosureType>
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void oop_iterate_range(OopClosureType* blk, int start, int end);
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};
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// See similar requirement for oopDesc.
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static_assert(std::is_trivially_default_constructible<objArrayOopDesc>::value, "required");
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#endif // SHARE_OOPS_OBJARRAYOOP_HPP
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