src/hotspot/cpu/x86/gc/shared/modRefBarrierSetAssembler_x86.cpp

/*
 * Copyright (c) 2018, 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 (type == T_OBJECT || type == T_ARRAY) {
#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 (type == T_OBJECT || type == T_ARRAY) {
#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 (type == T_OBJECT || type == T_ARRAY) {
    oop_store_at(masm, decorators, type, dst, val, tmp1, tmp2);
  } else {
    BarrierSetAssembler::store_at(masm, decorators, type, dst, val, tmp1, tmp2);
  }
}