/*

 * 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/shared/barrierSetAssembler.hpp"

#include "interpreter/interp_masm.hpp"

#define __ masm->

void BarrierSetAssembler::store_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,

                                   Register base, RegisterOrConstant ind_or_offs, Register val,

                                   Register tmp1, Register tmp2, Register tmp3, bool needs_frame) {

  bool in_heap = (decorators & IN_HEAP) != 0;

  bool in_native = (decorators & IN_NATIVE) != 0;

  bool not_null = (decorators & IS_NOT_NULL) != 0;

  assert(in_heap || in_native, "where?");

  assert_different_registers(base, val, tmp1, tmp2, R0);

  switch (type) {

  case T_ARRAY:

  case T_OBJECT: {

    if (UseCompressedOops && in_heap) {

      Register co = tmp1;

      if (val == noreg) {

        __ li(co, 0);

      } else {

        co = not_null ? __ encode_heap_oop_not_null(tmp1, val) : __ encode_heap_oop(tmp1, val);

      }

      __ stw(co, ind_or_offs, base, tmp2);

    } else {

      if (val == noreg) {

        val = tmp1;

        __ li(val, 0);

      }

      __ std(val, ind_or_offs, base, tmp2);

    }

    break;

  }

  default: Unimplemented();

  }

}

void BarrierSetAssembler::load_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,

                                  Register base, RegisterOrConstant ind_or_offs, Register dst,

                                  Register tmp1, Register tmp2, bool needs_frame, Label *L_handle_null) {

  bool in_heap = (decorators & IN_HEAP) != 0;

  bool in_native = (decorators & IN_NATIVE) != 0;

  bool not_null = (decorators & IS_NOT_NULL) != 0;

  assert(in_heap || in_native, "where?");

  assert_different_registers(ind_or_offs.register_or_noreg(), dst, R0);

  switch (type) {

  case T_ARRAY:

  case T_OBJECT: {

    if (UseCompressedOops && in_heap) {

      if (L_handle_null != NULL) { // Label provided.

        __ lwz(dst, ind_or_offs, base);

        __ cmpwi(CCR0, dst, 0);

        __ beq(CCR0, *L_handle_null);

        __ decode_heap_oop_not_null(dst);

      } else if (not_null) { // Guaranteed to be not null.

        Register narrowOop = (tmp1 != noreg && Universe::narrow_oop_base_disjoint()) ? tmp1 : dst;

        __ lwz(narrowOop, ind_or_offs, base);

        __ decode_heap_oop_not_null(dst, narrowOop);

      } else { // Any oop.

        __ lwz(dst, ind_or_offs, base);

        __ decode_heap_oop(dst);

      }

    } else {

      __ ld(dst, ind_or_offs, base);

      if (L_handle_null != NULL) {

        __ cmpdi(CCR0, dst, 0);

        __ beq(CCR0, *L_handle_null);

      }

    }

    break;

  }

  default: Unimplemented();

  }

}

void BarrierSetAssembler::resolve_jobject(MacroAssembler* masm, Register value,

                                          Register tmp1, Register tmp2, bool needs_frame) {

  Label done;

  __ cmpdi(CCR0, value, 0);

  __ beq(CCR0, done);         // Use NULL as-is.

  __ clrrdi(tmp1, value, JNIHandles::weak_tag_size);

  __ ld(value, 0, tmp1);      // Resolve (untagged) jobject.

  __ verify_oop(value);

  __ bind(done);

}