hotspot/src/share/vm/oops/arrayOop.hpp
author coleenp
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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
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/*
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 * Copyright (c) 1997, 2012, 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_VM_OOPS_ARRAYOOP_HPP
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#define SHARE_VM_OOPS_ARRAYOOP_HPP
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#include "memory/universe.inline.hpp"
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#include "oops/oop.hpp"
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// arrayOopDesc is the abstract baseclass for all arrays.  It doesn't
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// declare pure virtual to enforce this because that would allocate a vtbl
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// in each instance, which we don't want.
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// The layout of array Oops is:
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//
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//  markOop
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//  Klass*    // 32 bits if compressed but declared 64 in LP64.
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//  length    // shares klass memory or allocated after declared fields.
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class arrayOopDesc : public oopDesc {
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  friend class VMStructs;
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  // Interpreter/Compiler offsets
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  // Header size computation.
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  // The header is considered the oop part of this type plus the length.
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  // Returns the aligned header_size_in_bytes.  This is not equivalent to
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  // sizeof(arrayOopDesc) which should not appear in the code.
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  static int header_size_in_bytes() {
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    size_t hs = align_size_up(length_offset_in_bytes() + sizeof(int),
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                              HeapWordSize);
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#ifdef ASSERT
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    // make sure it isn't called before UseCompressedOops is initialized.
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    static size_t arrayoopdesc_hs = 0;
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    if (arrayoopdesc_hs == 0) arrayoopdesc_hs = hs;
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    assert(arrayoopdesc_hs == hs, "header size can't change");
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#endif // ASSERT
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    return (int)hs;
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  }
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  // The _length field is not declared in C++.  It is allocated after the
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  // declared nonstatic fields in arrayOopDesc if not compressed, otherwise
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  // it occupies the second half of the _klass field in oopDesc.
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  static int length_offset_in_bytes() {
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    return UseCompressedKlassPointers ? klass_gap_offset_in_bytes() :
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                               sizeof(arrayOopDesc);
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  }
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  // Returns the offset of the first element.
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  static int base_offset_in_bytes(BasicType type) {
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    return header_size(type) * HeapWordSize;
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  }
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  // Returns the address of the first element.
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  void* base(BasicType type) const {
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    return (void*) (((intptr_t) this) + base_offset_in_bytes(type));
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  }
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  // Tells whether index is within bounds.
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  bool is_within_bounds(int index) const        { return 0 <= index && index < length(); }
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  // Accessors for instance variable which is not a C++ declared nonstatic
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  // field.
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  int length() const {
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    return *(int*)(((intptr_t)this) + length_offset_in_bytes());
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  }
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  void set_length(int length) {
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    *(int*)(((intptr_t)this) + length_offset_in_bytes()) = length;
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  }
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  // Should only be called with constants as argument
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  // (will not constant fold otherwise)
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  // Returns the header size in words aligned to the requirements of the
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  // array object type.
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  static int header_size(BasicType type) {
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    size_t typesize_in_bytes = header_size_in_bytes();
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    return (int)(Universe::element_type_should_be_aligned(type)
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      ? align_object_offset(typesize_in_bytes/HeapWordSize)
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      : typesize_in_bytes/HeapWordSize);
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  }
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  // Return the maximum length of an array of BasicType.  The length can passed
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  // to typeArrayOop::object_size(scale, length, header_size) without causing an
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  // overflow. We also need to make sure that this will not overflow a size_t on
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  // 32 bit platforms when we convert it to a byte size.
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  static int32_t max_array_length(BasicType type) {
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    assert(type >= 0 && type < T_CONFLICT, "wrong type");
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    assert(type2aelembytes(type) != 0, "wrong type");
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    const size_t max_element_words_per_size_t =
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      align_size_down((SIZE_MAX/HeapWordSize - header_size(type)), MinObjAlignment);
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    const size_t max_elements_per_size_t =
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      HeapWordSize * max_element_words_per_size_t / type2aelembytes(type);
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    if ((size_t)max_jint < max_elements_per_size_t) {
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      // It should be ok to return max_jint here, but parts of the code
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      // (CollectedHeap, Klass::oop_oop_iterate(), and more) uses an int for
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      // passing around the size (in words) of an object. So, we need to avoid
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      // overflowing an int when we add the header. See CRs 4718400 and 7110613.
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      return align_size_down(max_jint - header_size(type), MinObjAlignment);
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    }
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    return (int32_t)max_elements_per_size_t;
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  }
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// for unit testing
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#ifndef PRODUCT
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  static bool check_max_length_overflow(BasicType type);
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  static int32_t old_max_array_length(BasicType type);
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  static void test_max_array_length();
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#endif
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};
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#endif // SHARE_VM_OOPS_ARRAYOOP_HPP