1 /*
   2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 #include "precompiled.hpp"
  25 #include "memory/allocation.hpp"
  26 #include "memory/metachunk.hpp"
  27 #include "unittest.hpp"
  28 #include "utilities/copy.hpp"
  29 #include "utilities/debug.hpp"
  30 
  31 class MetachunkTest {
  32  public:
  33   static MetaWord* initial_top(Metachunk* metachunk) {
  34     return metachunk->initial_top();
  35   }
  36   static MetaWord* top(Metachunk* metachunk) {
  37     return metachunk->top();
  38   }
  39 
  40 };
  41 
  42 TEST(Metachunk, basic) {
  43   size_t size = 2 * 1024 * 1024;
  44   void* memory = malloc(size);
  45   ASSERT_TRUE(NULL != memory) << "Failed to malloc 2MB";
  46 
  47   Metachunk* metachunk = ::new (memory) Metachunk(size / BytesPerWord, NULL);
  48 
  49   EXPECT_EQ((MetaWord*) metachunk, metachunk->bottom());
  50   EXPECT_EQ((uintptr_t*) metachunk + metachunk->size(), metachunk->end());
  51 
  52   // Check sizes
  53   EXPECT_EQ(metachunk->size(), metachunk->word_size());
  54   EXPECT_EQ(pointer_delta(metachunk->end(), metachunk->bottom(),
  55                 sizeof (MetaWord*)),
  56             metachunk->word_size());
  57 
  58   // Check usage
  59   EXPECT_EQ(metachunk->used_word_size(), metachunk->overhead());
  60   EXPECT_EQ(metachunk->word_size() - metachunk->used_word_size(),
  61             metachunk->free_word_size());
  62   EXPECT_EQ(MetachunkTest::top(metachunk), MetachunkTest::initial_top(metachunk));
  63   EXPECT_TRUE(metachunk->is_empty());
  64 
  65   // Allocate
  66   size_t alloc_size = 64; // Words
  67   EXPECT_TRUE(is_size_aligned(alloc_size, Metachunk::object_alignment()));
  68 
  69   MetaWord* mem = metachunk->allocate(alloc_size);
  70 
  71   // Check post alloc
  72   EXPECT_EQ(MetachunkTest::initial_top(metachunk), mem);
  73   EXPECT_EQ(MetachunkTest::top(metachunk), mem + alloc_size);
  74   EXPECT_EQ(metachunk->overhead() + alloc_size, metachunk->used_word_size());
  75   EXPECT_EQ(metachunk->word_size() - metachunk->used_word_size(),
  76             metachunk->free_word_size());
  77   EXPECT_FALSE(metachunk->is_empty());
  78 
  79   // Clear chunk
  80   metachunk->reset_empty();
  81 
  82   // Check post clear
  83   EXPECT_EQ(metachunk->used_word_size(), metachunk->overhead());
  84   EXPECT_EQ(metachunk->word_size() - metachunk->used_word_size(),
  85             metachunk->free_word_size());
  86   EXPECT_EQ(MetachunkTest::top(metachunk), MetachunkTest::initial_top(metachunk));
  87   EXPECT_TRUE(metachunk->is_empty());
  88 
  89   free(memory);
  90 }