/*

 * 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 "oops/oop.inline.hpp"

#include "unittest.hpp"

#include "utilities/globalDefinitions.hpp"

static char memory[32];

oop fake_object() {

  return cast_to_oop(memory);

}

template <typename T>

T* fake_field_addr() {

  return reinterpret_cast<T*>(&memory[16]);

}

TEST_VM(oopDesc, field_offset_oop) {

  // Fake object

  oop obj = fake_object();

  // Fake oop field

  oop* oop_field_addr = fake_field_addr<oop>();

  // Check offset

  size_t oop_offset = obj->field_offset(oop_field_addr);

  ASSERT_EQ(16u, oop_offset);

}

TEST_VM(oopDesc, field_offset_narrowOop) {

  // Fake object

  oop obj = fake_object();

  // Fake narrowOop field

  narrowOop* narrowOop_field_addr = fake_field_addr<narrowOop>();

  size_t narrowOop_offset = obj->field_offset(narrowOop_field_addr);

  ASSERT_EQ(16u, narrowOop_offset);

}

TEST_VM(oopDesc, field_offset_primitive) {

  // Fake object

  oop obj = fake_object();

  // Fake primitive field

  char* char_field_addr = fake_field_addr<char>();

  size_t char_offset = obj->field_offset(char_field_addr);

  ASSERT_EQ(16u, char_offset);

}