1 /*
   2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   3  * ORACLE PROPRIETARY/CONFIDENTIAL.  Use is subject to license terms.
   4  */
   5 
   6 #include "precompiled.hpp"
   7 #include "gc/z/zBitMap.inline.hpp"
   8 #include "unittest.hpp"
   9 
  10 class ZBitMapTest : public ::testing::Test {
  11 protected:
  12   static void test_set_pair_unset(size_t size, bool finalizable) {
  13     ZBitMap bitmap(size);
  14 
  15     for (BitMap::idx_t i = 0; i < size - 1; i++) {
  16       if ((i + 1) % BitsPerWord == 0) {
  17         // Can't set pairs of bits in different words.
  18         continue;
  19       }
  20 
  21       // ZBitMaps are not cleared when constructed.
  22       bitmap.clear();
  23 
  24       bool inc_live = false;
  25 
  26       bool ret = bitmap.par_set_bit_pair(i, finalizable, inc_live);
  27       EXPECT_TRUE(ret) << "Failed to set bit";
  28       EXPECT_TRUE(inc_live) << "Should have set inc_live";
  29 
  30       // First bit should always be set
  31       EXPECT_TRUE(bitmap.at(i)) << "Should be set";
  32 
  33       // Second bit should only be set when marking strong
  34       EXPECT_NE(bitmap.at(i + 1), finalizable);
  35     }
  36   }
  37 
  38   static void test_set_pair_set(size_t size, bool finalizable) {
  39     ZBitMap bitmap(size);
  40 
  41     for (BitMap::idx_t i = 0; i < size - 1; i++) {
  42       if ((i + 1) % BitsPerWord == 0) {
  43         // Can't set pairs of bits in different words.
  44         continue;
  45       }
  46 
  47       // Fill the bitmap with ones.
  48       bitmap.set_range(0, size);
  49 
  50       bool inc_live = false;
  51 
  52       bool ret = bitmap.par_set_bit_pair(i, finalizable, inc_live);
  53       EXPECT_FALSE(ret) << "Should not succeed setting bit";
  54       EXPECT_FALSE(inc_live) << "Should not have set inc_live";
  55 
  56       // Both bits were pre-set.
  57       EXPECT_TRUE(bitmap.at(i)) << "Should be set";
  58       EXPECT_TRUE(bitmap.at(i + 1)) << "Should be set";
  59     }
  60   }
  61 
  62   static void test_set_pair_set(bool finalizable) {
  63     test_set_pair_set(2,   finalizable);
  64     test_set_pair_set(62,  finalizable);
  65     test_set_pair_set(64,  finalizable);
  66     test_set_pair_set(66,  finalizable);
  67     test_set_pair_set(126, finalizable);
  68     test_set_pair_set(128, finalizable);
  69   }
  70 
  71   static void test_set_pair_unset(bool finalizable) {
  72     test_set_pair_unset(2,   finalizable);
  73     test_set_pair_unset(62,  finalizable);
  74     test_set_pair_unset(64,  finalizable);
  75     test_set_pair_unset(66,  finalizable);
  76     test_set_pair_unset(126, finalizable);
  77     test_set_pair_unset(128, finalizable);
  78   }
  79 
  80 };
  81 
  82 TEST_F(ZBitMapTest, test_set_pair_set) {
  83   test_set_pair_set(false);
  84   test_set_pair_set(true);
  85 }
  86 
  87 TEST_F(ZBitMapTest, test_set_pair_unset) {
  88   test_set_pair_unset(false);
  89   test_set_pair_unset(true);
  90 }