/*

 * Copyright (c) 2016, 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 "runtime/os.hpp"

#include "unittest.hpp"

#include "utilities/globalDefinitions.hpp"

static ::testing::AssertionResult testPageAddress(

  const char* expected_addr_expr,

  const char* addr_expr,

  const char* page_addr_expr,

  const char* page_size_expr,

  const char* actual_addr_expr,

  address expected_addr,

  address addr,

  address page_addr,

  intptr_t page_size,

  address actual_addr) {

  if (expected_addr == actual_addr) {

    return ::testing::AssertionSuccess();

  }

  return ::testing::AssertionFailure()

    << actual_addr_expr << " returned unexpected address " << (void*) actual_addr << std::endl

    << "Expected " << expected_addr_expr << ": " << (void*) expected_addr << std::endl

    << "where" << std::endl

    << addr_expr << ": " << (void*) addr << std::endl

    << page_addr_expr << ": " << (void*) page_addr << std::endl

    << page_size_expr << ": " << page_size;

}

TEST_VM(globalDefinitions, clamp_address_in_page) {

  const intptr_t page_sizes[] = {os::vm_page_size(), 4096, 8192, 65536, 2 * 1024 * 1024};

  const int num_page_sizes = sizeof(page_sizes) / sizeof(page_sizes[0]);

  for (int i = 0; i < num_page_sizes; i++) {

    intptr_t page_size = page_sizes[i];

    address page_address = (address) (10 * page_size);

    const intptr_t within_page_offsets[] = {0, 128, page_size - 1};

    const int num_within_page_offsets = sizeof(within_page_offsets) / sizeof(within_page_offsets[0]);

    for (int k = 0; k < num_within_page_offsets; ++k) {

      address addr = page_address + within_page_offsets[k];

      address expected_address = addr;

      EXPECT_PRED_FORMAT5(testPageAddress, expected_address, addr, page_address, page_size,

                          clamp_address_in_page(addr, page_address, page_size))

        << "Expect that address within page is returned as is";

    }

    const intptr_t above_page_offsets[] = {page_size, page_size + 1, 5 * page_size + 1};

    const int num_above_page_offsets = sizeof(above_page_offsets) / sizeof(above_page_offsets[0]);

    for (int k = 0; k < num_above_page_offsets; ++k) {

      address addr = page_address + above_page_offsets[k];

      address expected_address = page_address + page_size;

      EXPECT_PRED_FORMAT5(testPageAddress, expected_address, addr, page_address, page_size,

                          clamp_address_in_page(addr, page_address, page_size))

        << "Expect that address above page returns start of next page";

    }

    const intptr_t below_page_offsets[] = {1, 2 * page_size + 1, 5 * page_size + 1};

    const int num_below_page_offsets = sizeof(below_page_offsets) / sizeof(below_page_offsets[0]);

    for (int k = 0; k < num_below_page_offsets; ++k) {

      address addr = page_address - below_page_offsets[k];

      address expected_address = page_address;

      EXPECT_PRED_FORMAT5(testPageAddress, expected_address, addr, page_address, page_size,

                          clamp_address_in_page(addr, page_address, page_size))

        << "Expect that address below page returns start of page";

    }

  }

}

TEST(globalDefinitions, exact_unit_for_byte_size) {

  EXPECT_STREQ("B", exact_unit_for_byte_size(0));

  EXPECT_STREQ("B", exact_unit_for_byte_size(1));

  EXPECT_STREQ("B", exact_unit_for_byte_size(K - 1));

  EXPECT_STREQ("K", exact_unit_for_byte_size(K));

  EXPECT_STREQ("B", exact_unit_for_byte_size(K + 1));

  EXPECT_STREQ("B", exact_unit_for_byte_size(M - 1));

  EXPECT_STREQ("M", exact_unit_for_byte_size(M));

  EXPECT_STREQ("B", exact_unit_for_byte_size(M + 1));

  EXPECT_STREQ("K", exact_unit_for_byte_size(M + K));

#ifdef LP64

  EXPECT_STREQ("B", exact_unit_for_byte_size(G - 1));

  EXPECT_STREQ("G", exact_unit_for_byte_size(G));

  EXPECT_STREQ("B", exact_unit_for_byte_size(G + 1));

  EXPECT_STREQ("K", exact_unit_for_byte_size(G + K));

  EXPECT_STREQ("M", exact_unit_for_byte_size(G + M));

  EXPECT_STREQ("K", exact_unit_for_byte_size(G + M + K));

#endif

}

TEST(globalDefinitions, byte_size_in_exact_unit) {

  EXPECT_EQ(0u, byte_size_in_exact_unit(0));

  EXPECT_EQ(1u, byte_size_in_exact_unit(1));

  EXPECT_EQ(K - 1, byte_size_in_exact_unit(K - 1));

  EXPECT_EQ(1u, byte_size_in_exact_unit(K));

  EXPECT_EQ(K + 1, byte_size_in_exact_unit(K + 1));

  EXPECT_EQ(M - 1, byte_size_in_exact_unit(M - 1));

  EXPECT_EQ(1u, byte_size_in_exact_unit(M));

  EXPECT_EQ(M + 1, byte_size_in_exact_unit(M + 1));

  EXPECT_EQ(K + 1, byte_size_in_exact_unit(M + K));

#ifdef LP64

  EXPECT_EQ(G - 1, byte_size_in_exact_unit(G - 1));

  EXPECT_EQ(1u, byte_size_in_exact_unit(G));

  EXPECT_EQ(G + 1, byte_size_in_exact_unit(G + 1));

  EXPECT_EQ(M + 1, byte_size_in_exact_unit(G + K));

  EXPECT_EQ(K + 1, byte_size_in_exact_unit(G + M));

  EXPECT_EQ(M + K + 1, byte_size_in_exact_unit(G + M + K));

#endif

}