/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <fstream>

#include "base/stringprintf.h"
#include "builder.h"
#include "dex_file.h"
#include "dex_instruction.h"
#include "graph_visualizer.h"
#include "nodes.h"
#include "optimizing_unit_test.h"
#include "pretty_printer.h"
#include "ssa_builder.h"
#include "ssa_liveness_analysis.h"
#include "utils/arena_allocator.h"

#include "gtest/gtest.h"

namespace art {

static void TestCode(const uint16_t* data, const int* expected_order, size_t number_of_blocks) {
  ArenaPool pool;
  ArenaAllocator allocator(&pool);
  HGraphBuilder builder(&allocator);
  const DexFile::CodeItem* item = reinterpret_cast<const DexFile::CodeItem*>(data);
  HGraph* graph = builder.BuildGraph(*item);
  ASSERT_NE(graph, nullptr);

  graph->BuildDominatorTree();
  graph->FindNaturalLoops();
  SsaLivenessAnalysis liveness(*graph);
  liveness.Analyze();

  ASSERT_EQ(liveness.GetLinearPostOrder().Size(), number_of_blocks);
  for (size_t i = 0; i < number_of_blocks; ++i) {
    ASSERT_EQ(liveness.GetLinearPostOrder().Get(number_of_blocks - i - 1)->GetBlockId(),
              expected_order[i]);
  }
}

TEST(LinearizeTest, CFG1) {
  // Structure of this graph (* are back edges)
  //            Block0
  //              |
  //            Block1
  //              |
  //            Block2 ******
  //            /   \       *
  //       Block5   Block7  *
  //         |        |     *
  //       Block6   Block3  *
  //               * /   \  *
  //           Block4   Block8

  const uint16_t data[] = ONE_REGISTER_CODE_ITEM(
    Instruction::CONST_4 | 0 | 0,
    Instruction::IF_EQ, 5,
    Instruction::IF_EQ, 0xFFFE,
    Instruction::GOTO | 0xFE00,
    Instruction::RETURN_VOID);

  const int blocks[] = {0, 1, 2, 7, 3, 4, 8, 5, 6};
  TestCode(data, blocks, 9);
}

TEST(LinearizeTest, CFG2) {
  // Structure of this graph (* are back edges)
  //            Block0
  //              |
  //            Block1
  //              |
  //            Block2 ******
  //            /   \       *
  //       Block3   Block7  *
  //         |        |     *
  //       Block6   Block4  *
  //               * /   \  *
  //           Block5   Block8

  const uint16_t data[] = ONE_REGISTER_CODE_ITEM(
    Instruction::CONST_4 | 0 | 0,
    Instruction::IF_EQ, 3,
    Instruction::RETURN_VOID,
    Instruction::IF_EQ, 0xFFFD,
    Instruction::GOTO | 0xFE00);

  const int blocks[] = {0, 1, 2, 7, 4, 5, 8, 3, 6};
  TestCode(data, blocks, 9);
}

TEST(LinearizeTest, CFG3) {
  // Structure of this graph (* are back edges)
  //            Block0
  //              |
  //            Block1
  //              |
  //            Block2 ******
  //            /   \       *
  //       Block3   Block8  *
  //         |        |     *
  //       Block7   Block5  *
  //                 / *  \ *
  //           Block6  * Block9
  //             |     *
  //           Block4 **
  const uint16_t data[] = ONE_REGISTER_CODE_ITEM(
    Instruction::CONST_4 | 0 | 0,
    Instruction::IF_EQ, 4,
    Instruction::RETURN_VOID,
    Instruction::GOTO | 0x0100,
    Instruction::IF_EQ, 0xFFFC,
    Instruction::GOTO | 0xFD00);

  const int blocks[] = {0, 1, 2, 8, 5, 6, 4, 9, 3, 7};
  TestCode(data, blocks, 10);
}

TEST(LinearizeTest, CFG4) {
  // Structure of this graph (* are back edges)
  //            Block0
  //              |
  //            Block1
  //              |
  //            Block2
  //            / *  \
  //       Block6 * Block8
  //         |    *   |
  //       Block7 * Block3 *******
  //              *  /  \        *
  //           Block9   Block10  *
  //                      |      *
  //                    Block4   *
  //                   */    \   *
  //                Block5  Block11
  const uint16_t data[] = ONE_REGISTER_CODE_ITEM(
    Instruction::CONST_4 | 0 | 0,
    Instruction::IF_EQ, 7,
    Instruction::IF_EQ, 0xFFFE,
    Instruction::IF_EQ, 0xFFFE,
    Instruction::GOTO | 0xFE00,
    Instruction::RETURN_VOID);

  const int blocks[] = {0, 1, 2, 8, 3, 10, 4, 5, 11, 9, 6, 7};
  TestCode(data, blocks, 12);
}

TEST(LinearizeTest, CFG5) {
  // Structure of this graph (* are back edges)
  //            Block0
  //              |
  //            Block1
  //              |
  //            Block2
  //            / *  \
  //       Block3 * Block8
  //         |    *   |
  //       Block7 * Block4 *******
  //              *  /  \        *
  //           Block9   Block10  *
  //                      |      *
  //                    Block5   *
  //                   */    \   *
  //                Block6  Block11
  const uint16_t data[] = ONE_REGISTER_CODE_ITEM(
    Instruction::CONST_4 | 0 | 0,
    Instruction::IF_EQ, 3,
    Instruction::RETURN_VOID,
    Instruction::IF_EQ, 0xFFFD,
    Instruction::IF_EQ, 0xFFFE,
    Instruction::GOTO | 0xFE00);

  const int blocks[] = {0, 1, 2, 8, 4, 10, 5, 6, 11, 9, 3, 7};
  TestCode(data, blocks, 12);
}

}  // namespace art