text: /*
   * Copyright (c) 2018, 2019, 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.
   *
   */
  
  #include "precompiled.hpp"
  #include "asm/macroAssembler.inline.hpp"
  #include "gc/shared/modRefBarrierSetAssembler.hpp"
  
  #define __ masm->
  
  void ModRefBarrierSetAssembler::arraycopy_prologue(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
                                                     Register src, Register dst, Register count) {
    bool checkcast = (decorators & ARRAYCOPY_CHECKCAST) != 0;
    bool disjoint = (decorators & ARRAYCOPY_DISJOINT) != 0;
    bool obj_int = type == T_OBJECT LP64_ONLY(&& UseCompressedOops);
  
    if (is_reference_type(type)) {
  #ifdef _LP64
      if (!checkcast) {
        if (!obj_int) {
          // Save count for barrier
          __ movptr(r11, count);
        } else if (disjoint) {
          // Save dst in r11 in the disjoint case
          __ movq(r11, dst);
        }
      }
  #else
      if (disjoint) {
        __ mov(rdx, dst);          // save 'to'
      }
  #endif
      gen_write_ref_array_pre_barrier(masm, decorators, dst, count);
    }
  }
  
  void ModRefBarrierSetAssembler::arraycopy_epilogue(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
                                                     Register src, Register dst, Register count) {
    bool checkcast = (decorators & ARRAYCOPY_CHECKCAST) != 0;
    bool disjoint = (decorators & ARRAYCOPY_DISJOINT) != 0;
    bool obj_int = type == T_OBJECT LP64_ONLY(&& UseCompressedOops);
    Register tmp = rax;
  
    if (is_reference_type(type)) {
  #ifdef _LP64
      if (!checkcast) {
        if (!obj_int) {
          // Save count for barrier
          count = r11;
        } else if (disjoint) {
          // Use the saved dst in the disjoint case
          dst = r11;
        }
      } else {
        tmp = rscratch1;
      }
  #else
      if (disjoint) {
        __ mov(dst, rdx); // restore 'to'
      }
  #endif
      gen_write_ref_array_post_barrier(masm, decorators, dst, count, tmp);
    }
  }
  
  void ModRefBarrierSetAssembler::store_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
                                           Address dst, Register val, Register tmp1, Register tmp2) {
    if (is_reference_type(type)) {
      oop_store_at(masm, decorators, type, dst, val, tmp1, tmp2);
    } else {
      BarrierSetAssembler::store_at(masm, decorators, type, dst, val, tmp1, tmp2);
    }
  }
  