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/metaspace/metachunk.hpp"
  27 #include "unittest.hpp"
  28 #include "utilities/align.hpp"
  29 #include "utilities/copy.hpp"
  30 #include "utilities/debug.hpp"
  31 
  32 using namespace metaspace::internals;
  33 
  34 class MetachunkTest {
  35  public:
  36   static MetaWord* initial_top(Metachunk* metachunk) {
  37     return metachunk->initial_top();
  38   }
  39   static MetaWord* top(Metachunk* metachunk) {
  40     return metachunk->top();
  41   }
  42 
  43 };
  44 
  45 TEST(Metachunk, basic) {
  46   const ChunkIndex chunk_type = MediumIndex;
  47   const bool is_class = false;
  48   const size_t word_size = get_size_for_nonhumongous_chunktype(chunk_type, is_class);
  49   // Allocate the chunk with correct alignment.
  50   void* memory = malloc(word_size * BytesPerWord * 2);
  51   ASSERT_TRUE(NULL != memory) << "Failed to malloc 2MB";
  52 
  53   void* p_placement = align_up(memory, word_size * BytesPerWord);
  54 
  55   Metachunk* metachunk = ::new (p_placement) Metachunk(chunk_type, is_class, word_size, NULL);
  56 
  57   EXPECT_EQ((MetaWord*) metachunk, metachunk->bottom());
  58   EXPECT_EQ((uintptr_t*) metachunk + metachunk->size(), metachunk->end());
  59 
  60   // Check sizes
  61   EXPECT_EQ(metachunk->size(), metachunk->word_size());
  62   EXPECT_EQ(pointer_delta(metachunk->end(), metachunk->bottom(),
  63                 sizeof (MetaWord*)),
  64             metachunk->word_size());
  65 
  66   // Check usage
  67   EXPECT_EQ(metachunk->used_word_size(), metachunk->overhead());
  68   EXPECT_EQ(metachunk->word_size() - metachunk->used_word_size(),
  69             metachunk->free_word_size());
  70   EXPECT_EQ(MetachunkTest::top(metachunk), MetachunkTest::initial_top(metachunk));
  71   EXPECT_TRUE(metachunk->is_empty());
  72 
  73   // Allocate
  74   size_t alloc_size = 64; // Words
  75   EXPECT_TRUE(is_aligned(alloc_size, Metachunk::object_alignment()));
  76 
  77   MetaWord* mem = metachunk->allocate(alloc_size);
  78 
  79   // Check post alloc
  80   EXPECT_EQ(MetachunkTest::initial_top(metachunk), mem);
  81   EXPECT_EQ(MetachunkTest::top(metachunk), mem + alloc_size);
  82   EXPECT_EQ(metachunk->overhead() + alloc_size, metachunk->used_word_size());
  83   EXPECT_EQ(metachunk->word_size() - metachunk->used_word_size(),
  84             metachunk->free_word_size());
  85   EXPECT_FALSE(metachunk->is_empty());
  86 
  87   // Clear chunk
  88   metachunk->reset_empty();
  89 
  90   // Check post clear
  91   EXPECT_EQ(metachunk->used_word_size(), metachunk->overhead());
  92   EXPECT_EQ(metachunk->word_size() - metachunk->used_word_size(),
  93             metachunk->free_word_size());
  94   EXPECT_EQ(MetachunkTest::top(metachunk), MetachunkTest::initial_top(metachunk));
  95   EXPECT_TRUE(metachunk->is_empty());
  96 
  97   free(memory);
  98 }