src/hotspot/share/oops/flatArrayKlass.hpp - master - githubmirror/panama-vector

src/hotspot/share/oops/flatArrayKlass.hpp
156 строк5 KB
Tobias Hartmann
8388256: [lworld] Clone of reference array is broken in C2
03 авг 2026, 13:40
03 авг 2026, 13:400df7d08
/*
 * Copyright (c) 2017, 2025, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef SHARE_VM_OOPS_FLATARRAYKLASS_HPP
#define SHARE_VM_OOPS_FLATARRAYKLASS_HPP

#include "classfile/classLoaderData.hpp"
#include "oops/arrayKlass.hpp"
#include "oops/inlineKlass.hpp"
#include "oops/objArrayKlass.hpp"
#include "utilities/macros.hpp"

/**
 * Array of inline types, gives a layout of typeArrayOop, but needs oops iterators
 */
class FlatArrayKlass : public ObjArrayKlass {
  friend class Deoptimization;
  friend class oopFactory;
  friend class VMStructs;

 public:
  static const KlassKind Kind = FlatArrayKlassKind;

 private:
  // Constructor
  FlatArrayKlass(Klass* element_klass, Symbol* name, ArrayProperties props, LayoutKind lk);

  LayoutKind _layout_kind;

 public:

  FlatArrayKlass() {} // used by CppVtableCloner<T>::initialize()

  InlineKlass* element_klass() const { return InlineKlass::cast(ObjArrayKlass::element_klass()); }

  LayoutKind layout_kind() const  { return _layout_kind; }
  static ByteSize layout_kind_offset() { return in_ByteSize(offset_of(FlatArrayKlass, _layout_kind)); }

  // Casting from Klass*
  static FlatArrayKlass* cast(Klass* k) {
    return const_cast<FlatArrayKlass*>(cast(const_cast<const Klass*>(k)));
  }

  static const FlatArrayKlass* cast(const Klass* k) {
    assert(k != nullptr, "k should not be null");
    assert(k->is_flatArray_klass(), "cast to FlatArrayKlass");
    return static_cast<const FlatArrayKlass*>(k);
  }

  // klass allocation
  static FlatArrayKlass* allocate_klass(Klass* element_klass, ArrayProperties props, LayoutKind lk, TRAPS);

  void initialize(TRAPS) override;

  bool can_be_primary_super_slow() const override;

  int element_byte_size() const { return 1 << layout_helper_log2_element_size(_layout_helper); }

  DEBUG_ONLY(bool is_flatArray_klass_slow() const override { return true; })

  bool contains_oops() {
    return element_klass()->contains_oops();
  }

  oop protection_domain() const override;

  void metaspace_pointers_do(MetaspaceClosure* iter) override;

  static jint array_layout_helper(InlineKlass* vklass, LayoutKind lk); // layout helper for values

  // sizing
  static int header_size()  { return sizeof(FlatArrayKlass) / wordSize; }
  int size() const override { return ArrayKlass::static_size(header_size()); }

  jint max_elements() const;

  size_t oop_size(oop obj) const override;

  // Oop Allocation
  objArrayOop allocate_instance(int length, TRAPS) override final;

  oop multi_allocate(int rank, jint* sizes, TRAPS) override;

  // Naming
  const char* internal_name() const override { return external_name(); }

  // Copying
  void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS) override;

  // GC specific object visitors
  template <typename T, typename OopClosureType>
  inline void oop_oop_iterate(oop obj, OopClosureType* closure);

  template <typename T, typename OopClosureType>
  inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);

  template <typename T, typename OopClosureType>
  inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);

  template <typename T, class OopClosureType>
  inline void oop_oop_iterate_elements(flatArrayOop a, OopClosureType* closure);

  // Iterate over oop elements within index range [start, end), and no metadata.
  template <typename T, class OopClosureType>
  inline void oop_oop_iterate_elements_range(flatArrayOop a, OopClosureType* closure, int start, int end);

private:
  template <typename T, class OopClosureType>
  inline void oop_oop_iterate_elements_specialized(flatArrayOop a, OopClosureType* closure, int start, int end);

  template <typename T, class OopClosureType>
  inline void oop_oop_iterate_elements_bounded(flatArrayOop a, OopClosureType* closure, MemRegion mr);

  template <typename T, class OopClosureType>
  inline void oop_oop_iterate_elements_specialized_bounded(flatArrayOop a, OopClosureType* closure, uintptr_t low, uintptr_t high);

 public:
  u2 compute_modifier_flags() const override;

  // Printing
  void print_on(outputStream* st) const override;
  void print_value_on(outputStream* st) const override;

  void oop_print_value_on(oop obj, outputStream* st) override;
#ifndef PRODUCT
  void oop_print_on(oop obj, outputStream* st) override;
#endif
  void oop_print_elements_on(flatArrayOop fa, outputStream* st);

  // Verification
  void verify_on(outputStream* st) override;
  void oop_verify_on(oop obj, outputStream* st) override;
};

#endif