1 /*
   2  * Copyright (c) 2014, 2015, 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 
  25 #include "precompiled.hpp"
  26 #include "classfile/classLoaderStats.hpp"
  27 #include "oops/oop.inline.hpp"
  28 #include "utilities/globalDefinitions.hpp"
  29 
  30 
  31 class ClassStatsClosure : public KlassClosure {
  32 public:
  33   int _num_classes;
  34 
  35   ClassStatsClosure() :
  36     _num_classes(0) {
  37   }
  38 
  39   virtual void do_klass(Klass* k) {
  40     _num_classes++;
  41   }
  42 };
  43 
  44 
  45 void ClassLoaderStatsClosure::do_cld(ClassLoaderData* cld) {
  46   oop cl = cld->class_loader();
  47   ClassLoaderStats* cls;
  48 
  49   // The hashtable key is the ClassLoader oop since we want to account
  50   // for "real" classes and anonymous classes together
  51   ClassLoaderStats** cls_ptr = _stats->get(cl);
  52   if (cls_ptr == NULL) {
  53     cls = new ClassLoaderStats();
  54     _stats->put(cl, cls);
  55     _total_loaders++;
  56   } else {
  57     cls = *cls_ptr;
  58   }
  59 
  60   if (!cld->is_anonymous()) {
  61     cls->_cld = cld;
  62   }
  63 
  64   cls->_class_loader = cl;
  65   if (cl != NULL) {
  66     cls->_parent = java_lang_ClassLoader::parent(cl);
  67     addEmptyParents(cls->_parent);
  68   }
  69 
  70   ClassStatsClosure csc;
  71   cld->classes_do(&csc);
  72   if(cld->is_anonymous()) {
  73     cls->_anon_classes_count += csc._num_classes;
  74   } else {
  75     cls->_classes_count = csc._num_classes;
  76   }
  77   _total_classes += csc._num_classes;
  78 
  79   ClassLoaderMetaspace* ms = cld->metaspace_or_null();
  80   if (ms != NULL) {
  81     if(cld->is_anonymous()) {
  82       cls->_anon_chunk_sz += ms->allocated_chunks_bytes();
  83       cls->_anon_block_sz += ms->allocated_blocks_bytes();
  84     } else {
  85       cls->_chunk_sz = ms->allocated_chunks_bytes();
  86       cls->_block_sz = ms->allocated_blocks_bytes();
  87     }
  88     _total_chunk_sz += ms->allocated_chunks_bytes();
  89     _total_block_sz += ms->allocated_blocks_bytes();
  90   }
  91 }
  92 
  93 
  94 // Handles the difference in pointer width on 32 and 64 bit platforms
  95 #ifdef _LP64
  96   #define SPACE "%8s"
  97 #else
  98   #define SPACE "%s"
  99 #endif
 100 
 101 
 102 bool ClassLoaderStatsClosure::do_entry(oop const& key, ClassLoaderStats* const& cls) {
 103   Klass* class_loader_klass = (cls->_class_loader == NULL ? NULL : cls->_class_loader->klass());
 104   Klass* parent_klass = (cls->_parent == NULL ? NULL : cls->_parent->klass());
 105 
 106   _out->print(INTPTR_FORMAT "  " INTPTR_FORMAT "  " INTPTR_FORMAT "  " UINTX_FORMAT_W(6) "  " SIZE_FORMAT_W(8) "  " SIZE_FORMAT_W(8) "  ",
 107       p2i(class_loader_klass), p2i(parent_klass), p2i(cls->_cld),
 108       cls->_classes_count,
 109       cls->_chunk_sz, cls->_block_sz);
 110   if (class_loader_klass != NULL) {
 111     _out->print("%s", class_loader_klass->external_name());
 112   } else {
 113     _out->print("<boot class loader>");
 114   }
 115   _out->cr();
 116   if (cls->_anon_classes_count > 0) {
 117     _out->print_cr(SPACE SPACE SPACE "                                    " UINTX_FORMAT_W(6) "  " SIZE_FORMAT_W(8) "  " SIZE_FORMAT_W(8) "   + unsafe anonymous classes",
 118         "", "", "",
 119         cls->_anon_classes_count,
 120         cls->_anon_chunk_sz, cls->_anon_block_sz);
 121   }
 122   return true;
 123 }
 124 
 125 
 126 void ClassLoaderStatsClosure::print() {
 127   _out->print_cr("ClassLoader" SPACE " Parent" SPACE "      CLD*" SPACE "       Classes   ChunkSz   BlockSz  Type", "", "", "");
 128   _stats->iterate(this);
 129   _out->print("Total = " UINTX_FORMAT_W(-6), _total_loaders);
 130   _out->print(SPACE SPACE SPACE "                      ", "", "", "");
 131   _out->print_cr(UINTX_FORMAT_W(6) "  " SIZE_FORMAT_W(8) "  " SIZE_FORMAT_W(8) "  ",
 132       _total_classes,
 133       _total_chunk_sz,
 134       _total_block_sz);
 135   _out->print_cr("ChunkSz: Total size of all allocated metaspace chunks");
 136   _out->print_cr("BlockSz: Total size of all allocated metaspace blocks (each chunk has several blocks)");
 137 }
 138 
 139 
 140 void ClassLoaderStatsClosure::addEmptyParents(oop cl) {
 141   while (cl != NULL && java_lang_ClassLoader::loader_data(cl) == NULL) {
 142     // This classloader has not loaded any classes
 143     ClassLoaderStats** cls_ptr = _stats->get(cl);
 144     if (cls_ptr == NULL) {
 145       // It does not exist in our table - add it
 146       ClassLoaderStats* cls = new ClassLoaderStats();
 147       cls->_class_loader = cl;
 148       cls->_parent = java_lang_ClassLoader::parent(cl);
 149       _stats->put(cl, cls);
 150       _total_loaders++;
 151     }
 152 
 153     cl = java_lang_ClassLoader::parent(cl);
 154   }
 155 }
 156 
 157 
 158 void ClassLoaderStatsVMOperation::doit() {
 159   ClassLoaderStatsClosure clsc (_out);
 160   ClassLoaderDataGraph::cld_do(&clsc);
 161   clsc.print();
 162 }
 163 
 164 
 165 void ClassLoaderStatsDCmd::execute(DCmdSource source, TRAPS) {
 166   ClassLoaderStatsVMOperation op(output());
 167   VMThread::execute(&op);
 168 }