/*

 * 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 "gc/shared/barrierSetAssembler.hpp"

#include "runtime/jniHandles.hpp"

#define __ masm->

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

                                  Register dst, Address src, Register tmp1, Register tmp_thread) {

  // LR is live.  It must be saved around calls.

  bool oop_not_null = (decorators & OOP_NOT_NULL) != 0;

  switch (type) {

  case T_OBJECT:

  case T_ARRAY: {

      if (UseCompressedOops) {

        __ ldrw(dst, src);

        if (oop_not_null) {

          __ decode_heap_oop_not_null(dst);

        } else {

          __ decode_heap_oop(dst);

        }

      } else {

        __ ldr(dst, src);

      }

    } else {

      __ ldr(dst, src);

    }

    break;

  }

  case T_BOOLEAN: __ load_unsigned_byte (dst, src); break;

  case T_BYTE:    __ load_signed_byte   (dst, src); break;

  case T_CHAR:    __ load_unsigned_short(dst, src); break;

  case T_SHORT:   __ load_signed_short  (dst, src); break;

  case T_INT:     __ ldrw               (dst, src); break;

  case T_LONG:    __ ldr                (dst, src); break;

  case T_ADDRESS: __ ldr                (dst, src); break;

  case T_FLOAT:   __ ldrs               (v0, src);  break;

  case T_DOUBLE:  __ ldrd               (v0, src);  break;

  default: Unimplemented();

  }

}

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

                                   Address dst, Register val, Register tmp1, Register tmp2) {

  switch (type) {

  case T_OBJECT:

  case T_ARRAY: {

    val = val == noreg ? zr : val;

      if (UseCompressedOops) {

        assert(!dst.uses(val), "not enough registers");

        if (val != zr) {

          __ encode_heap_oop(val);

        }

        __ strw(val, dst);

      } else {

        __ str(val, dst);

      }

    } else {

      __ str(val, dst);

    }

    break;

  }

  case T_BOOLEAN:

    __ andw(val, val, 0x1);  // boolean is true if LSB is 1

    __ strb(val, dst);

    break;

  case T_BYTE:    __ strb(val, dst); break;

  case T_CHAR:    __ strh(val, dst); break;

  case T_SHORT:   __ strh(val, dst); break;

  case T_INT:     __ strw(val, dst); break;

  case T_LONG:    __ str (val, dst); break;

  case T_ADDRESS: __ str (val, dst); break;

  case T_FLOAT:   __ strs(v0,  dst); break;

  case T_DOUBLE:  __ strd(v0,  dst); break;

  default: Unimplemented();

  }

}

void BarrierSetAssembler::obj_equals(MacroAssembler* masm,

                                     Register obj1, Register obj2) {

  __ cmp(obj1, obj2);

}

void BarrierSetAssembler::try_resolve_jobject_in_native(MacroAssembler* masm, Register jni_env,

                                                        Register obj, Register tmp, Label& slowpath) {

  // If mask changes we need to ensure that the inverse is still encodable as an immediate

  STATIC_ASSERT(JNIHandles::weak_tag_mask == 1);

  __ andr(obj, obj, ~JNIHandles::weak_tag_mask);

  __ ldr(obj, Address(obj, 0));             // *obj

}