/*

 * 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) {

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

  bool on_root = (decorators & IN_ROOT) != 0;

  switch (type) {

  case T_OBJECT:

  case T_ARRAY: {

    if (on_heap) {

      __ load_heap_oop(dst, src);

    } else {

      assert(on_root, "why else?");

      __ ldr(dst, src);

    }

    break;

  }

  default: Unimplemented();

  }

}

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

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

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

  bool on_root = (decorators & IN_ROOT) != 0;

  switch (type) {

  case T_OBJECT:

  case T_ARRAY: {

    if (on_heap) {

      __ store_heap_oop(dst, val);

    } else {

      assert(on_root, "why else?");

      __ str(val, dst);

    }

    break;

  }

  default: Unimplemented();

  }

}

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

}