src/hotspot/share/classfile/classLoaderHierarchyDCmd.cpp
author coleenp
Fri, 28 Sep 2018 16:07:39 -0400
changeset 51959 db0c3952de52
parent 51681 72bdaf11dd6a
child 52586 74109912c738
permissions -rw-r--r--
8209645: Split ClassLoaderData and ClassLoaderDataGraph into separate files Reviewed-by: iklam, stuefe
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/*
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 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
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 * Copyright (c) 2018 SAP SE. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "classfile/classLoaderData.inline.hpp"
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#include "classfile/classLoaderDataGraph.hpp"
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#include "classfile/classLoaderHierarchyDCmd.hpp"
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#include "memory/allocation.hpp"
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#include "memory/resourceArea.hpp"
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#include "runtime/safepoint.hpp"
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#include "oops/reflectionAccessorImplKlassHelper.hpp"
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#include "utilities/globalDefinitions.hpp"
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#include "utilities/ostream.hpp"
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ClassLoaderHierarchyDCmd::ClassLoaderHierarchyDCmd(outputStream* output, bool heap)
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  : DCmdWithParser(output, heap),
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   _show_classes("show-classes", "Print loaded classes.", "BOOLEAN", false, "false"),
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  _verbose("verbose", "Print detailed information.", "BOOLEAN", false, "false"),
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  _fold("fold", "Show loaders of the same name and class as one.", "BOOLEAN", true, "true") {
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  _dcmdparser.add_dcmd_option(&_show_classes);
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  _dcmdparser.add_dcmd_option(&_verbose);
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  _dcmdparser.add_dcmd_option(&_fold);
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}
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int ClassLoaderHierarchyDCmd::num_arguments() {
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  ResourceMark rm;
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  ClassLoaderHierarchyDCmd* dcmd = new ClassLoaderHierarchyDCmd(NULL, false);
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  if (dcmd != NULL) {
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    DCmdMark mark(dcmd);
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    return dcmd->_dcmdparser.num_arguments();
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  } else {
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    return 0;
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  }
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}
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// Helper class for drawing the branches to the left of a node.
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class BranchTracker : public StackObj {
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  //       "<x>"
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  //       " |---<y>"
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  //       " |    |
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  //       " |   <z>"
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  //       " |    |---<z1>
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  //       " |    |---<z2>
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  //       ^^^^^^^ ^^^
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  //        A       B
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  // Some terms for the graphics:
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  // - branch: vertical connection between a node's ancestor to a later sibling.
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  // - branchwork: (A) the string to print as a prefix at the start of each line, contains all branches.
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  // - twig (B): Length of the dashed line connecting a node to its branch.
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  // - branch spacing: how many spaces between branches are printed.
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public:
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  enum { max_depth = 64, twig_len = 2, branch_spacing = 5 };
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private:
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  char _branches[max_depth];
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  int _pos;
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public:
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  BranchTracker()
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    : _pos(0) {}
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  void push(bool has_branch) {
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    if (_pos < max_depth) {
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      _branches[_pos] = has_branch ? '|' : ' ';
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    }
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    _pos ++; // beyond max depth, omit branch drawing but do count on.
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  }
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  void pop() {
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    assert(_pos > 0, "must be");
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    _pos --;
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  }
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  void print(outputStream* st) {
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    for (int i = 0; i < _pos; i ++) {
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      st->print("%c%.*s", _branches[i], branch_spacing, "          ");
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    }
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  }
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  class Mark {
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    BranchTracker& _tr;
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  public:
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    Mark(BranchTracker& tr, bool has_branch_here)
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      : _tr(tr)  { _tr.push(has_branch_here); }
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    ~Mark() { _tr.pop(); }
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  };
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}; // end: BranchTracker
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struct LoadedClassInfo : public ResourceObj {
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public:
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  LoadedClassInfo* _next;
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  Klass* const _klass;
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  const ClassLoaderData* const _cld;
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  LoadedClassInfo(Klass* klass, const ClassLoaderData* cld)
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    : _klass(klass), _cld(cld) {}
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};
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class LoaderTreeNode : public ResourceObj {
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  // We walk the CLDG and, for each CLD which is non-unsafe_anonymous, add
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  // a tree node.
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  // To add a node we need its parent node; if the parent node does not yet
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  // exist - because we have not yet encountered the CLD for the parent loader -
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  // we add a preliminary empty LoaderTreeNode for it. This preliminary node
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  // just contains the loader oop and nothing else. Once we encounter the CLD of
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  // this parent loader, we fill in all the other details.
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  const oop _loader_oop;
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  const ClassLoaderData* _cld;
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  LoaderTreeNode* _child;
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  LoaderTreeNode* _next;
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  LoadedClassInfo* _classes;
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  int _num_classes;
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  LoadedClassInfo* _anon_classes;
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  int _num_anon_classes;
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  // In default view, similar tree nodes (same loader class, same name or no name)
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  // are folded into each other to make the output more readable.
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  // _num_folded contains the number of nodes which have been folded into this
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  // one.
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  int _num_folded;
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  void print_with_childs(outputStream* st, BranchTracker& branchtracker,
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      bool print_classes, bool verbose) const {
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    ResourceMark rm;
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    if (_cld == NULL) {
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      // Not sure how this could happen: we added a preliminary node for a parent but then never encountered
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      // its CLD?
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      return;
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    }
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    // Retrieve information.
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    const Klass* const loader_klass = _cld->class_loader_klass();
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    const Symbol* const loader_name = _cld->name();
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    branchtracker.print(st);
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    // e.g. "+--- jdk.internal.reflect.DelegatingClassLoader"
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    st->print("+%.*s", BranchTracker::twig_len, "----------");
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    if (_cld->is_the_null_class_loader_data()) {
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      st->print(" <bootstrap>");
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    } else {
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      if (loader_name != NULL) {
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        st->print(" \"%s\",", loader_name->as_C_string());
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      }
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      st->print(" %s", loader_klass != NULL ? loader_klass->external_name() : "??");
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      if (_num_folded > 0) {
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        st->print(" (+ %d more)", _num_folded);
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      }
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    }
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    st->cr();
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    // Output following this node (node details and child nodes) - up to the next sibling node
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    // needs to be prefixed with "|" if there is a follow up sibling.
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    const bool have_sibling = _next != NULL;
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    BranchTracker::Mark trm(branchtracker, have_sibling);
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    {
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      // optional node details following this node needs to be prefixed with "|"
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      // if there are follow up child nodes.
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      const bool have_child = _child != NULL;
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      BranchTracker::Mark trm(branchtracker, have_child);
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      // Empty line
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      branchtracker.print(st);
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      st->cr();
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      const int indentation = 18;
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      if (verbose) {
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        branchtracker.print(st);
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        st->print_cr("%*s " PTR_FORMAT, indentation, "Loader Oop:", p2i(_loader_oop));
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        branchtracker.print(st);
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        st->print_cr("%*s " PTR_FORMAT, indentation, "Loader Data:", p2i(_cld));
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        branchtracker.print(st);
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        st->print_cr("%*s " PTR_FORMAT, indentation, "Loader Klass:", p2i(loader_klass));
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        // Empty line
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        branchtracker.print(st);
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        st->cr();
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      }
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      if (print_classes) {
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        if (_classes != NULL) {
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          for (LoadedClassInfo* lci = _classes; lci; lci = lci->_next) {
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            // Non-unsafe anonymous classes should live in the primary CLD of its loader
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            assert(lci->_cld == _cld, "must be");
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            branchtracker.print(st);
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            if (lci == _classes) { // first iteration
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              st->print("%*s ", indentation, "Classes:");
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            } else {
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              st->print("%*s ", indentation, "");
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            }
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            st->print("%s", lci->_klass->external_name());
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            // Special treatment for generated core reflection accessor classes: print invocation target.
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            if (ReflectionAccessorImplKlassHelper::is_generated_accessor(lci->_klass)) {
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              st->print(" (invokes: ");
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              ReflectionAccessorImplKlassHelper::print_invocation_target(st, lci->_klass);
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              st->print(")");
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            }
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            st->cr();
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          }
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          branchtracker.print(st);
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          st->print("%*s ", indentation, "");
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          st->print_cr("(%u class%s)", _num_classes, (_num_classes == 1) ? "" : "es");
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          // Empty line
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          branchtracker.print(st);
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          st->cr();
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        }
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        if (_anon_classes != NULL) {
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          for (LoadedClassInfo* lci = _anon_classes; lci; lci = lci->_next) {
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            branchtracker.print(st);
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            if (lci == _anon_classes) { // first iteration
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              st->print("%*s ", indentation, "Unsafe Anonymous Classes:");
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            } else {
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              st->print("%*s ", indentation, "");
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            }
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            st->print("%s", lci->_klass->external_name());
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            // For unsafe anonymous classes, also print CLD if verbose. Should be a different one than the primary CLD.
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            assert(lci->_cld != _cld, "must be");
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            if (verbose) {
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              st->print("  (Loader Data: " PTR_FORMAT ")", p2i(lci->_cld));
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            }
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            st->cr();
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          }
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          branchtracker.print(st);
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          st->print("%*s ", indentation, "");
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          st->print_cr("(%u unsafe anonymous class%s)", _num_anon_classes, (_num_anon_classes == 1) ? "" : "es");
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          // Empty line
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          branchtracker.print(st);
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          st->cr();
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        }
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      } // end: print_classes
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    } // Pop branchtracker mark
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    // Print children, recursively
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    LoaderTreeNode* c = _child;
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    while (c != NULL) {
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      c->print_with_childs(st, branchtracker, print_classes, verbose);
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      c = c->_next;
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    }
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  }
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  // Helper: Attempt to fold this node into the target node. If success, returns true.
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  // Folding can be done if both nodes are leaf nodes and they refer to the same loader class
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  // and they have the same name or no name (note: leaf check is done by caller).
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  bool can_fold_into(LoaderTreeNode* target_node) const {
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    assert(is_leaf() && target_node->is_leaf(), "must be leaf");
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    return _cld->class_loader_klass() == target_node->_cld->class_loader_klass() &&
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           _cld->name() == target_node->_cld->name();
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  }
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public:
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  LoaderTreeNode(const oop loader_oop)
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    : _loader_oop(loader_oop), _cld(NULL), _child(NULL), _next(NULL),
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      _classes(NULL), _num_classes(0), _anon_classes(NULL), _num_anon_classes(0),
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      _num_folded(0)
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    {}
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  void set_cld(const ClassLoaderData* cld) {
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    _cld = cld;
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  }
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  void add_child(LoaderTreeNode* info) {
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    info->_next = _child;
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    _child = info;
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  }
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  void add_sibling(LoaderTreeNode* info) {
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    assert(info->_next == NULL, "must be");
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    info->_next = _next;
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    _next = info;
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  }
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  void add_classes(LoadedClassInfo* first_class, int num_classes, bool is_unsafe_anonymous) {
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    LoadedClassInfo** p_list_to_add_to = is_unsafe_anonymous ? &_anon_classes : &_classes;
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    // Search tail.
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    while ((*p_list_to_add_to) != NULL) {
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      p_list_to_add_to = &(*p_list_to_add_to)->_next;
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    }
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    *p_list_to_add_to = first_class;
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    if (is_unsafe_anonymous) {
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      _num_anon_classes += num_classes;
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    } else {
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      _num_classes += num_classes;
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    }
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  }
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  const ClassLoaderData* cld() const {
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    return _cld;
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  }
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  const oop loader_oop() const {
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    return _loader_oop;
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  }
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  LoaderTreeNode* find(const oop loader_oop) {
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    LoaderTreeNode* result = NULL;
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    if (_loader_oop == loader_oop) {
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      result = this;
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    } else {
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      LoaderTreeNode* c = _child;
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      while (c != NULL && result == NULL) {
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        result = c->find(loader_oop);
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        c = c->_next;
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      }
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    }
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    return result;
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  }
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  bool is_leaf() const { return _child == NULL; }
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  // Attempt to fold similar nodes among this node's children. We only fold leaf nodes
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  // (no child class loaders).
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  // For non-leaf nodes (class loaders with child class loaders), do this recursivly.
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  void fold_children() {
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    LoaderTreeNode* node = _child;
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    LoaderTreeNode* prev = NULL;
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    while (node != NULL) {
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      LoaderTreeNode* matching_node = NULL;
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      if (node->is_leaf()) {
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        // Look among the preceeding node siblings for a match.
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        for (LoaderTreeNode* node2 = _child; node2 != node && matching_node == NULL;
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            node2 = node2->_next) {
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          if (node2->is_leaf() && node->can_fold_into(node2)) {
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            matching_node = node2;
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          }
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        }
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      } else {
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        node->fold_children();
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      }
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      if (matching_node != NULL) {
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        // Increase fold count for the matching node and remove folded node from the child list.
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        matching_node->_num_folded ++;
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        assert(prev != NULL, "Sanity"); // can never happen since we do not fold the first node.
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        prev->_next = node->_next;
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      } else {
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        prev = node;
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      }
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      node = node->_next;
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    }
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  }
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   390
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  void print_with_childs(outputStream* st, bool print_classes, bool print_add_info) const {
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    BranchTracker bwt;
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    print_with_childs(st, bwt, print_classes, print_add_info);
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  }
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};
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   397
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class LoadedClassCollectClosure : public KlassClosure {
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public:
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   400
  LoadedClassInfo* _list;
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   401
  const ClassLoaderData* _cld;
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   402
  int _num_classes;
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   403
  LoadedClassCollectClosure(const ClassLoaderData* cld)
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   404
    : _list(NULL), _cld(cld), _num_classes(0) {}
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   405
  void do_klass(Klass* k) {
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   406
    LoadedClassInfo* lki = new LoadedClassInfo(k, _cld);
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   407
    lki->_next = _list;
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   408
    _list = lki;
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   409
    _num_classes ++;
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   410
  }
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   411
};
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   412
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   413
class LoaderInfoScanClosure : public CLDClosure {
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   414
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   415
  const bool _print_classes;
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   416
  const bool _verbose;
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   417
  LoaderTreeNode* _root;
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   418
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   419
  static void fill_in_classes(LoaderTreeNode* info, const ClassLoaderData* cld) {
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   420
    assert(info != NULL && cld != NULL, "must be");
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   421
    LoadedClassCollectClosure lccc(cld);
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   422
    const_cast<ClassLoaderData*>(cld)->classes_do(&lccc);
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   423
    if (lccc._num_classes > 0) {
51444
3e5d28e6de32 8209301: JVM rename is_anonymous, host_klass to unsafe specific terminology ahead of Unsafe.defineAnonymousClass deprecation
lfoltan
parents: 51334
diff changeset
   424
      info->add_classes(lccc._list, lccc._num_classes, cld->is_unsafe_anonymous());
50443
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   425
    }
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   426
  }
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   427
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   428
  LoaderTreeNode* find_node_or_add_empty_node(oop loader_oop) {
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   429
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   430
    assert(_root != NULL, "root node must exist");
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   431
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   432
    if (loader_oop == NULL) {
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   433
      return _root;
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   434
    }
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   435
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   436
    // Check if a node for this oop already exists.
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   437
    LoaderTreeNode* info = _root->find(loader_oop);
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   438
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   439
    if (info == NULL) {
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   440
      // It does not. Create a node.
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   441
      info = new LoaderTreeNode(loader_oop);
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   442
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   443
      // Add it to tree.
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   444
      LoaderTreeNode* parent_info = NULL;
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   445
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   446
      // Recursively add parent nodes if needed.
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   447
      const oop parent_oop = java_lang_ClassLoader::parent(loader_oop);
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   448
      if (parent_oop == NULL) {
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   449
        parent_info = _root;
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   450
      } else {
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   451
        parent_info = find_node_or_add_empty_node(parent_oop);
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   452
      }
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   453
      assert(parent_info != NULL, "must be");
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   454
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   455
      parent_info->add_child(info);
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   456
    }
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   457
    return info;
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   458
  }
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   459
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   460
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   461
public:
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   462
  LoaderInfoScanClosure(bool print_classes, bool verbose)
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   463
    : _print_classes(print_classes), _verbose(verbose), _root(NULL) {
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   464
    _root = new LoaderTreeNode(NULL);
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   465
  }
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   466
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   467
  void print_results(outputStream* st) const {
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   468
    _root->print_with_childs(st, _print_classes, _verbose);
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   469
  }
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   470
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   471
  void do_cld (ClassLoaderData* cld) {
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   472
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   473
    // We do not display unloading loaders, for now.
51681
72bdaf11dd6a 8210233: Prepare Klass::is_loader_alive() for concurrent class unloading
eosterlund
parents: 51444
diff changeset
   474
    if (!cld->is_alive()) {
50443
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   475
      return;
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   476
    }
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   477
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   478
    const oop loader_oop = cld->class_loader();
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   479
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   480
    LoaderTreeNode* info = find_node_or_add_empty_node(loader_oop);
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   481
    assert(info != NULL, "must be");
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   482
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   483
    // Update CLD in node, but only if this is the primary CLD for this loader.
51444
3e5d28e6de32 8209301: JVM rename is_anonymous, host_klass to unsafe specific terminology ahead of Unsafe.defineAnonymousClass deprecation
lfoltan
parents: 51334
diff changeset
   484
    if (cld->is_unsafe_anonymous() == false) {
50443
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   485
      assert(info->cld() == NULL, "there should be only one primary CLD per loader");
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   486
      info->set_cld(cld);
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   487
    }
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   488
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   489
    // Add classes.
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   490
    fill_in_classes(info, cld);
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   491
  }
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   492
50863
9084fd587141 8205531: jcmd VM.classloaders should fold similar loaders
stuefe
parents: 50634
diff changeset
   493
  void fold() {
9084fd587141 8205531: jcmd VM.classloaders should fold similar loaders
stuefe
parents: 50634
diff changeset
   494
    _root->fold_children();
9084fd587141 8205531: jcmd VM.classloaders should fold similar loaders
stuefe
parents: 50634
diff changeset
   495
  }
9084fd587141 8205531: jcmd VM.classloaders should fold similar loaders
stuefe
parents: 50634
diff changeset
   496
50443
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   497
};
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   498
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   499
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   500
class ClassLoaderHierarchyVMOperation : public VM_Operation {
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   501
  outputStream* const _out;
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   502
  const bool _show_classes;
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   503
  const bool _verbose;
50863
9084fd587141 8205531: jcmd VM.classloaders should fold similar loaders
stuefe
parents: 50634
diff changeset
   504
  const bool _fold;
50443
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   505
public:
50863
9084fd587141 8205531: jcmd VM.classloaders should fold similar loaders
stuefe
parents: 50634
diff changeset
   506
  ClassLoaderHierarchyVMOperation(outputStream* out, bool show_classes, bool verbose, bool fold) :
9084fd587141 8205531: jcmd VM.classloaders should fold similar loaders
stuefe
parents: 50634
diff changeset
   507
    _out(out), _show_classes(show_classes), _verbose(verbose), _fold(fold)
50443
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   508
  {}
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   509
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   510
  VMOp_Type type() const {
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   511
    return VMOp_ClassLoaderHierarchyOperation;
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   512
  }
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   513
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   514
  void doit() {
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   515
    assert(SafepointSynchronize::is_at_safepoint(), "must be a safepoint");
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   516
    ResourceMark rm;
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   517
    LoaderInfoScanClosure cl (_show_classes, _verbose);
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   518
    ClassLoaderDataGraph::cld_do(&cl);
50863
9084fd587141 8205531: jcmd VM.classloaders should fold similar loaders
stuefe
parents: 50634
diff changeset
   519
    // In non-verbose and non-show-classes mode, attempt to fold the tree.
9084fd587141 8205531: jcmd VM.classloaders should fold similar loaders
stuefe
parents: 50634
diff changeset
   520
    if (_fold) {
9084fd587141 8205531: jcmd VM.classloaders should fold similar loaders
stuefe
parents: 50634
diff changeset
   521
      if (!_verbose && !_show_classes) {
9084fd587141 8205531: jcmd VM.classloaders should fold similar loaders
stuefe
parents: 50634
diff changeset
   522
        cl.fold();
9084fd587141 8205531: jcmd VM.classloaders should fold similar loaders
stuefe
parents: 50634
diff changeset
   523
      }
9084fd587141 8205531: jcmd VM.classloaders should fold similar loaders
stuefe
parents: 50634
diff changeset
   524
    }
50443
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   525
    cl.print_results(_out);
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   526
  }
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   527
};
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   528
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   529
// This command needs to be executed at a safepoint.
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   530
void ClassLoaderHierarchyDCmd::execute(DCmdSource source, TRAPS) {
50863
9084fd587141 8205531: jcmd VM.classloaders should fold similar loaders
stuefe
parents: 50634
diff changeset
   531
  ClassLoaderHierarchyVMOperation op(output(), _show_classes.value(), _verbose.value(), _fold.value());
50443
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   532
  VMThread::execute(&op);
8e56de95ce10 8203682: Add jcmd "VM.classloaders" command to print out class loader hierarchy, details
stuefe
parents:
diff changeset
   533
}