/*

 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.

 * Copyright (c) 2018, SAP SE. 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/g1/g1BarrierSet.hpp"

#include "gc/g1/g1CardTable.hpp"

#include "gc/g1/g1BarrierSetAssembler.hpp"

#include "gc/g1/heapRegion.hpp"

#include "gc/shared/collectedHeap.hpp"

#include "runtime/thread.hpp"

#include "interpreter/interp_masm.hpp"

#define __ masm->

void G1BarrierSetAssembler::gen_write_ref_array_pre_barrier(MacroAssembler* masm, DecoratorSet decorators,

                                                            Register from, Register to, Register count,

                                                            Register preserve1, Register preserve2) {

  bool dest_uninitialized = (decorators & AS_DEST_NOT_INITIALIZED) != 0;

  // With G1, don't generate the call if we statically know that the target in uninitialized

  if (!dest_uninitialized) {

    int spill_slots = 3;

    if (preserve1 != noreg) { spill_slots++; }

    if (preserve2 != noreg) { spill_slots++; }

    const int frame_size = align_up(frame::abi_reg_args_size + spill_slots * BytesPerWord, frame::alignment_in_bytes);

    Label filtered;

    // Is marking active?

    if (in_bytes(SATBMarkQueue::byte_width_of_active()) == 4) {

      __ lwz(R0, in_bytes(JavaThread::satb_mark_queue_offset() + SATBMarkQueue::byte_offset_of_active()), R16_thread);

    } else {

      guarantee(in_bytes(SATBMarkQueue::byte_width_of_active()) == 1, "Assumption");

      __ lbz(R0, in_bytes(JavaThread::satb_mark_queue_offset() + SATBMarkQueue::byte_offset_of_active()), R16_thread);

    }

    __ cmpdi(CCR0, R0, 0);

    __ beq(CCR0, filtered);

    __ save_LR_CR(R0);

    __ push_frame(frame_size, R0);

    int slot_nr = 0;

    __ std(from,  frame_size - (++slot_nr) * wordSize, R1_SP);

    __ std(to,    frame_size - (++slot_nr) * wordSize, R1_SP);

    __ std(count, frame_size - (++slot_nr) * wordSize, R1_SP);

    if (preserve1 != noreg) { __ std(preserve1, frame_size - (++slot_nr) * wordSize, R1_SP); }

    if (preserve2 != noreg) { __ std(preserve2, frame_size - (++slot_nr) * wordSize, R1_SP); }

    if (UseCompressedOops) {

      __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_pre_narrow_oop_entry), to, count);

    } else {

      __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_pre_oop_entry), to, count);

    }

    slot_nr = 0;

    __ ld(from,  frame_size - (++slot_nr) * wordSize, R1_SP);

    __ ld(to,    frame_size - (++slot_nr) * wordSize, R1_SP);

    __ ld(count, frame_size - (++slot_nr) * wordSize, R1_SP);

    if (preserve1 != noreg) { __ ld(preserve1, frame_size - (++slot_nr) * wordSize, R1_SP); }

    if (preserve2 != noreg) { __ ld(preserve2, frame_size - (++slot_nr) * wordSize, R1_SP); }

    __ addi(R1_SP, R1_SP, frame_size); // pop_frame()

    __ restore_LR_CR(R0);

    __ bind(filtered);

  }

}

void G1BarrierSetAssembler::gen_write_ref_array_post_barrier(MacroAssembler* masm, DecoratorSet decorators,

                                                             Register addr, Register count, Register preserve) {

  int spill_slots = (preserve != noreg) ? 1 : 0;

  const int frame_size = align_up(frame::abi_reg_args_size + spill_slots * BytesPerWord, frame::alignment_in_bytes);

  __ save_LR_CR(R0);

  __ push_frame(frame_size, R0);

  if (preserve != noreg) { __ std(preserve, frame_size - 1 * wordSize, R1_SP); }

  __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_post_entry), addr, count);

  if (preserve != noreg) { __ ld(preserve, frame_size - 1 * wordSize, R1_SP); }

  __ addi(R1_SP, R1_SP, frame_size); // pop_frame();

  __ restore_LR_CR(R0);

}