1 /*
   2  * Copyright (c) 2014, 2018, 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/classLoaderData.inline.hpp"
  27 #include "classfile/classLoaderDataGraph.hpp"
  28 #include "classfile/classLoaderStats.hpp"
  29 #include "oops/oop.inline.hpp"
  30 #include "utilities/globalDefinitions.hpp"
  31 
  32 
  33 class ClassStatsClosure : public KlassClosure {
  34 public:
  35   int _num_classes;
  36 
  37   ClassStatsClosure() :
  38     _num_classes(0) {
  39   }
  40 
  41   virtual void do_klass(Klass* k) {
  42     _num_classes++;
  43   }
  44 };
  45 
  46 
  47 void ClassLoaderStatsClosure::do_cld(ClassLoaderData* cld) {
  48   oop cl = cld->class_loader();
  49   ClassLoaderStats* cls;
  50 
  51   // The hashtable key is the ClassLoader oop since we want to account
  52   // for "real" classes and anonymous classes together
  53   ClassLoaderStats** cls_ptr = _stats->get(cl);
  54   if (cls_ptr == NULL) {
  55     cls = new ClassLoaderStats();
  56     _stats->put(cl, cls);
  57     _total_loaders++;
  58   } else {
  59     cls = *cls_ptr;
  60   }
  61 
  62   if (!cld->is_shortlived()) {
  63     cls->_cld = cld;
  64   }
  65 
  66   cls->_class_loader = cl;
  67   if (cl != NULL) {
  68     cls->_parent = java_lang_ClassLoader::parent(cl);
  69     addEmptyParents(cls->_parent);
  70   }
  71 
  72   ClassStatsClosure csc;
  73   cld->classes_do(&csc);
  74   if(cld->is_shortlived()) {
  75     cls->_anon_classes_count += csc._num_classes;
  76   } else {
  77     cls->_classes_count = csc._num_classes;
  78   }
  79   _total_classes += csc._num_classes;
  80 
  81   ClassLoaderMetaspace* ms = cld->metaspace_or_null();
  82   if (ms != NULL) {
  83     if(cld->is_shortlived()) {
  84       cls->_anon_chunk_sz += ms->allocated_chunks_bytes();
  85       cls->_anon_block_sz += ms->allocated_blocks_bytes();
  86     } else {
  87       cls->_chunk_sz = ms->allocated_chunks_bytes();
  88       cls->_block_sz = ms->allocated_blocks_bytes();
  89     }
  90     _total_chunk_sz += ms->allocated_chunks_bytes();
  91     _total_block_sz += ms->allocated_blocks_bytes();
  92   }
  93 }
  94 
  95 
  96 // Handles the difference in pointer width on 32 and 64 bit platforms
  97 #ifdef _LP64
  98   #define SPACE "%8s"
  99 #else
 100   #define SPACE "%s"
 101 #endif
 102 
 103 
 104 bool ClassLoaderStatsClosure::do_entry(oop const& key, ClassLoaderStats* const& cls) {
 105   Klass* class_loader_klass = (cls->_class_loader == NULL ? NULL : cls->_class_loader->klass());
 106   Klass* parent_klass = (cls->_parent == NULL ? NULL : cls->_parent->klass());
 107 
 108   _out->print(INTPTR_FORMAT "  " INTPTR_FORMAT "  " INTPTR_FORMAT "  " UINTX_FORMAT_W(6) "  " SIZE_FORMAT_W(8) "  " SIZE_FORMAT_W(8) "  ",
 109       p2i(class_loader_klass), p2i(parent_klass), p2i(cls->_cld),
 110       cls->_classes_count,
 111       cls->_chunk_sz, cls->_block_sz);
 112   if (class_loader_klass != NULL) {
 113     _out->print("%s", class_loader_klass->external_name());
 114   } else {
 115     _out->print("<boot class loader>");
 116   }
 117   _out->cr();
 118   if (cls->_anon_classes_count > 0) {
 119     _out->print_cr(SPACE SPACE SPACE "                                    " UINTX_FORMAT_W(6) "  " SIZE_FORMAT_W(8) "  " SIZE_FORMAT_W(8) "   + unsafe anonymous classes",
 120         "", "", "",
 121         cls->_anon_classes_count,
 122         cls->_anon_chunk_sz, cls->_anon_block_sz);
 123   }
 124   return true;
 125 }
 126 
 127 
 128 void ClassLoaderStatsClosure::print() {
 129   _out->print_cr("ClassLoader" SPACE " Parent" SPACE "      CLD*" SPACE "       Classes   ChunkSz   BlockSz  Type", "", "", "");
 130   _stats->iterate(this);
 131   _out->print("Total = " UINTX_FORMAT_W(-6), _total_loaders);
 132   _out->print(SPACE SPACE SPACE "                      ", "", "", "");
 133   _out->print_cr(UINTX_FORMAT_W(6) "  " SIZE_FORMAT_W(8) "  " SIZE_FORMAT_W(8) "  ",
 134       _total_classes,
 135       _total_chunk_sz,
 136       _total_block_sz);
 137   _out->print_cr("ChunkSz: Total size of all allocated metaspace chunks");
 138   _out->print_cr("BlockSz: Total size of all allocated metaspace blocks (each chunk has several blocks)");
 139 }
 140 
 141 
 142 void ClassLoaderStatsClosure::addEmptyParents(oop cl) {
 143   while (cl != NULL && java_lang_ClassLoader::loader_data_acquire(cl) == NULL) {
 144     // This classloader has not loaded any classes
 145     ClassLoaderStats** cls_ptr = _stats->get(cl);
 146     if (cls_ptr == NULL) {
 147       // It does not exist in our table - add it
 148       ClassLoaderStats* cls = new ClassLoaderStats();
 149       cls->_class_loader = cl;
 150       cls->_parent = java_lang_ClassLoader::parent(cl);
 151       _stats->put(cl, cls);
 152       _total_loaders++;
 153     }
 154 
 155     cl = java_lang_ClassLoader::parent(cl);
 156   }
 157 }
 158 
 159 
 160 void ClassLoaderStatsVMOperation::doit() {
 161   ClassLoaderStatsClosure clsc (_out);
 162   ClassLoaderDataGraph::loaded_cld_do(&clsc);
 163   clsc.print();
 164 }
 165 
 166 
 167 void ClassLoaderStatsDCmd::execute(DCmdSource source, TRAPS) {
 168   ClassLoaderStatsVMOperation op(output());
 169   VMThread::execute(&op);
 170 }