src/hotspot/share/classfile/classLoaderData.hpp
author lfoltan
Mon, 25 Jun 2018 10:34:46 -0400
changeset 50759 00c4edaf2017
parent 50746 85789fb05154
child 51334 cc2c79d22508
permissions -rw-r--r--
8205509: assert(_name_and_id != 0LL) failed: encountered a class loader null name and id Summary: The method loader_name_and_id should return the external name of the class loader if _name_and_id is null. Reviewed-by: coleenp, stuefe
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/*
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 * Copyright (c) 2012, 2018, Oracle and/or its affiliates. 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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#ifndef SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP
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#define SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP
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#include "memory/allocation.hpp"
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#include "memory/memRegion.hpp"
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#include "memory/metaspace.hpp"
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#include "oops/oopHandle.hpp"
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#include "oops/weakHandle.hpp"
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#include "runtime/mutex.hpp"
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#include "utilities/growableArray.hpp"
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#include "utilities/macros.hpp"
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#if INCLUDE_JFR
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#include "jfr/support/jfrTraceIdExtension.hpp"
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#endif
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// external name (synthetic) for the primordial "bootstrap" class loader instance
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#define BOOTSTRAP_LOADER_NAME "bootstrap"
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#define BOOTSTRAP_LOADER_NAME_LEN 9
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//
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// A class loader represents a linkset. Conceptually, a linkset identifies
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// the complete transitive closure of resolved links that a dynamic linker can
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// produce.
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//
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// A ClassLoaderData also encapsulates the allocation space, called a metaspace,
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// used by the dynamic linker to allocate the runtime representation of all
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// the types it defines.
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//
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// ClassLoaderData are stored in the runtime representation of classes,
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// and provides iterators for root tracing and other GC operations.
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class ClassLoaderData;
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class JNIMethodBlock;
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class Metadebug;
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class ModuleEntry;
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class PackageEntry;
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class ModuleEntryTable;
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class PackageEntryTable;
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class DictionaryEntry;
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class Dictionary;
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// GC root for walking class loader data created
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class ClassLoaderDataGraph : public AllStatic {
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  friend class ClassLoaderData;
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  friend class ClassLoaderDataGraphMetaspaceIterator;
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  friend class ClassLoaderDataGraphKlassIteratorAtomic;
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  friend class ClassLoaderDataGraphKlassIteratorStatic;
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  friend class VMStructs;
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 private:
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  // All CLDs (except the null CLD) can be reached by walking _head->_next->...
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  static ClassLoaderData* _head;
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  static ClassLoaderData* _unloading;
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  // CMS support.
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  static ClassLoaderData* _saved_head;
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  static ClassLoaderData* _saved_unloading;
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  static bool _should_purge;
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  // OOM has been seen in metaspace allocation. Used to prevent some
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  // allocations until class unloading
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  static bool _metaspace_oom;
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  static volatile size_t  _num_instance_classes;
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  static volatile size_t  _num_array_classes;
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  static ClassLoaderData* add_to_graph(Handle class_loader, bool anonymous);
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  static ClassLoaderData* add(Handle class_loader, bool anonymous);
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 public:
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  static ClassLoaderData* find_or_create(Handle class_loader);
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  static void purge();
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  static void clear_claimed_marks();
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  // oops do
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  static void oops_do(OopClosure* f, bool must_claim);
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  static void keep_alive_oops_do(OopClosure* blk, bool must_claim);
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  static void always_strong_oops_do(OopClosure* blk, bool must_claim);
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  // cld do
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  static void cld_do(CLDClosure* cl);
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  static void cld_unloading_do(CLDClosure* cl);
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  static void roots_cld_do(CLDClosure* strong, CLDClosure* weak);
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  static void keep_alive_cld_do(CLDClosure* cl);
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  static void always_strong_cld_do(CLDClosure* cl);
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  // klass do
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  // Walking classes through the ClassLoaderDataGraph include array classes.  It also includes
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  // classes that are allocated but not loaded, classes that have errors, and scratch classes
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  // for redefinition.  These classes are removed during the next class unloading.
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  // Walking the ClassLoaderDataGraph also includes anonymous classes.
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  static void classes_do(KlassClosure* klass_closure);
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  static void classes_do(void f(Klass* const));
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  static void methods_do(void f(Method*));
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  static void modules_do(void f(ModuleEntry*));
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  static void modules_unloading_do(void f(ModuleEntry*));
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  static void packages_do(void f(PackageEntry*));
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  static void packages_unloading_do(void f(PackageEntry*));
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  static void loaded_classes_do(KlassClosure* klass_closure);
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  static void classes_unloading_do(void f(Klass* const));
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  static bool do_unloading(bool clean_previous_versions);
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  // dictionary do
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  // Iterate over all klasses in dictionary, but
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  // just the classes from defining class loaders.
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  static void dictionary_classes_do(void f(InstanceKlass*));
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  // Added for initialize_itable_for_klass to handle exceptions.
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  static void dictionary_classes_do(void f(InstanceKlass*, TRAPS), TRAPS);
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  // Iterate all classes and their class loaders, including initiating class loaders.
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  static void dictionary_all_entries_do(void f(InstanceKlass*, ClassLoaderData*));
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  // VM_CounterDecay iteration support
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  static InstanceKlass* try_get_next_class();
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  static void verify_dictionary();
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  static void print_dictionary(outputStream* st);
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  static void print_dictionary_statistics(outputStream* st);
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  // CMS support.
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  static void remember_new_clds(bool remember) { _saved_head = (remember ? _head : NULL); }
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  static GrowableArray<ClassLoaderData*>* new_clds();
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  static void set_should_purge(bool b) { _should_purge = b; }
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  static void purge_if_needed() {
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    // Only purge the CLDG for CMS if concurrent sweep is complete.
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    if (_should_purge) {
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      purge();
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      // reset for next time.
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      set_should_purge(false);
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    }
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  }
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  static int resize_if_needed();
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  static bool has_metaspace_oom()           { return _metaspace_oom; }
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  static void set_metaspace_oom(bool value) { _metaspace_oom = value; }
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  static void print_on(outputStream * const out) PRODUCT_RETURN;
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  static void print() { print_on(tty); }
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  static void verify();
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  // instance and array class counters
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  static inline size_t num_instance_classes();
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  static inline size_t num_array_classes();
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  static inline void inc_instance_classes(size_t count);
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  static inline void dec_instance_classes(size_t count);
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  static inline void inc_array_classes(size_t count);
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  static inline void dec_array_classes(size_t count);
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#ifndef PRODUCT
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  static bool contains_loader_data(ClassLoaderData* loader_data);
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#endif
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};
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// ClassLoaderData class
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class ClassLoaderData : public CHeapObj<mtClass> {
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  friend class VMStructs;
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 private:
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  class ChunkedHandleList {
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    struct Chunk : public CHeapObj<mtClass> {
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      static const size_t CAPACITY = 32;
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      oop _data[CAPACITY];
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      volatile juint _size;
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      Chunk* _next;
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      Chunk(Chunk* c) : _next(c), _size(0) { }
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    };
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    Chunk* volatile _head;
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    void oops_do_chunk(OopClosure* f, Chunk* c, const juint size);
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   public:
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    ChunkedHandleList() : _head(NULL) {}
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    ~ChunkedHandleList();
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    // Only one thread at a time can add, guarded by ClassLoaderData::metaspace_lock().
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    // However, multiple threads can execute oops_do concurrently with add.
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    oop* add(oop o);
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    bool contains(oop p);
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    NOT_PRODUCT(bool owner_of(oop* p);)
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    void oops_do(OopClosure* f);
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    int count() const;
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  };
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  friend class ClassLoaderDataGraph;
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  friend class ClassLoaderDataGraphKlassIteratorAtomic;
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  friend class ClassLoaderDataGraphKlassIteratorStatic;
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  friend class ClassLoaderDataGraphMetaspaceIterator;
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  friend class Klass;
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  friend class MetaDataFactory;
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  friend class Method;
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  static ClassLoaderData * _the_null_class_loader_data;
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  WeakHandle<vm_class_loader_data> _holder; // The oop that determines lifetime of this class loader
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  OopHandle _class_loader;    // The instance of java/lang/ClassLoader associated with
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                              // this ClassLoaderData
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  ClassLoaderMetaspace * volatile _metaspace;  // Meta-space where meta-data defined by the
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                                    // classes in the class loader are allocated.
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  Mutex* _metaspace_lock;  // Locks the metaspace for allocations and setup.
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  bool _unloading;         // true if this class loader goes away
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  bool _is_anonymous;      // if this CLD is for an anonymous class
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  // Remembered sets support for the oops in the class loader data.
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  bool _modified_oops;             // Card Table Equivalent (YC/CMS support)
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  bool _accumulated_modified_oops; // Mod Union Equivalent (CMS support)
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  s2 _keep_alive;          // if this CLD is kept alive.
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                           // Used for anonymous classes and the boot class
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                           // loader. _keep_alive does not need to be volatile or
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                           // atomic since there is one unique CLD per anonymous class.
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  volatile int _claimed;   // true if claimed, for example during GC traces.
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                           // To avoid applying oop closure more than once.
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                           // Has to be an int because we cas it.
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  ChunkedHandleList _handles; // Handles to constant pool arrays, Modules, etc, which
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                              // have the same life cycle of the corresponding ClassLoader.
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  NOT_PRODUCT(volatile int _dependency_count;)  // number of class loader dependencies
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  Klass* volatile _klasses;              // The classes defined by the class loader.
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  PackageEntryTable* volatile _packages; // The packages defined by the class loader.
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  ModuleEntryTable*  volatile _modules;  // The modules defined by the class loader.
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  ModuleEntry* _unnamed_module;          // This class loader's unnamed module.
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  Dictionary*  _dictionary;              // The loaded InstanceKlasses, including initiated by this class loader
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  // These method IDs are created for the class loader and set to NULL when the
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  // class loader is unloaded.  They are rarely freed, only for redefine classes
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  // and if they lose a data race in InstanceKlass.
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  JNIMethodBlock*                  _jmethod_ids;
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  // Metadata to be deallocated when it's safe at class unloading, when
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  // this class loader isn't unloaded itself.
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  GrowableArray<Metadata*>*      _deallocate_list;
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  // Support for walking class loader data objects
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  ClassLoaderData* _next; /// Next loader_datas created
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  Klass*  _class_loader_klass;
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  Symbol* _name;
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  Symbol* _name_and_id;
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  JFR_ONLY(DEFINE_TRACE_ID_FIELD;)
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  void set_next(ClassLoaderData* next) { _next = next; }
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  ClassLoaderData* next() const        { return _next; }
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  ClassLoaderData(Handle h_class_loader, bool is_anonymous);
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  ~ClassLoaderData();
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  // The CLD are not placed in the Heap, so the Card Table or
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  // the Mod Union Table can't be used to mark when CLD have modified oops.
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  // The CT and MUT bits saves this information for the whole class loader data.
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  void clear_modified_oops()             { _modified_oops = false; }
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 public:
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  void record_modified_oops()            { _modified_oops = true; }
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  bool has_modified_oops()               { return _modified_oops; }
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  void accumulate_modified_oops()        { if (has_modified_oops()) _accumulated_modified_oops = true; }
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  void clear_accumulated_modified_oops() { _accumulated_modified_oops = false; }
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  bool has_accumulated_modified_oops()   { return _accumulated_modified_oops; }
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 private:
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  void unload();
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  bool keep_alive() const       { return _keep_alive > 0; }
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  oop holder_phantom() const;
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  void classes_do(void f(Klass*));
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  void loaded_classes_do(KlassClosure* klass_closure);
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  void classes_do(void f(InstanceKlass*));
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  void methods_do(void f(Method*));
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  void modules_do(void f(ModuleEntry*));
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  void packages_do(void f(PackageEntry*));
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  // Deallocate free list during class unloading.
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  void free_deallocate_list();      // for the classes that are not unloaded
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  void unload_deallocate_list();    // for the classes that are unloaded
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  // Allocate out of this class loader data
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  MetaWord* allocate(size_t size);
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  Dictionary* create_dictionary();
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  void initialize_name(Handle class_loader);
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 public:
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  // GC interface.
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  void clear_claimed() { _claimed = 0; }
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  bool claimed() const { return _claimed == 1; }
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  bool claim();
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  bool is_alive() const;
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  // Accessors
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  ClassLoaderMetaspace* metaspace_or_null() const { return _metaspace; }
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  static ClassLoaderData* the_null_class_loader_data() {
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    return _the_null_class_loader_data;
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  }
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  Mutex* metaspace_lock() const { return _metaspace_lock; }
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  bool is_anonymous() const { return _is_anonymous; }
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  static void init_null_class_loader_data();
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  bool is_the_null_class_loader_data() const {
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    return this == _the_null_class_loader_data;
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  }
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  // Returns true if this class loader data is for the system class loader.
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  // (Note that the class loader data may be anonymous.)
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  bool is_system_class_loader_data() const;
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  // Returns true if this class loader data is for the platform class loader.
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  // (Note that the class loader data may be anonymous.)
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  bool is_platform_class_loader_data() const;
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  // Returns true if this class loader data is for the boot class loader.
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  // (Note that the class loader data may be anonymous.)
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  inline bool is_boot_class_loader_data() const;
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  bool is_builtin_class_loader_data() const;
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  bool is_permanent_class_loader_data() const;
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  // The Metaspace is created lazily so may be NULL.  This
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  // method will allocate a Metaspace if needed.
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  ClassLoaderMetaspace* metaspace_non_null();
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  inline oop class_loader() const;
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  // Returns true if this class loader data is for a loader going away.
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  bool is_unloading() const     {
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    assert(!(is_the_null_class_loader_data() && _unloading), "The null class loader can never be unloaded");
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    return _unloading;
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  }
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  // Used to refcount an anonymous class's CLD in order to
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  // indicate their aliveness.
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  void inc_keep_alive();
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  void dec_keep_alive();
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  void initialize_holder(Handle holder);
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  void oops_do(OopClosure* f, bool must_claim, bool clear_modified_oops = false);
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  void classes_do(KlassClosure* klass_closure);
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  Klass* klasses() { return _klasses; }
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  JNIMethodBlock* jmethod_ids() const              { return _jmethod_ids; }
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  void set_jmethod_ids(JNIMethodBlock* new_block)  { _jmethod_ids = new_block; }
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  void print()                                     { print_on(tty); }
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  void print_on(outputStream* out) const PRODUCT_RETURN;
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  void print_value()                               { print_value_on(tty); }
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  void print_value_on(outputStream* out) const;
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  void verify();
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  OopHandle add_handle(Handle h);
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  void remove_handle(OopHandle h);
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   384
  void init_handle_locked(OopHandle& pd, Handle h);  // used for concurrent access to ModuleEntry::_pd field
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  void add_class(Klass* k, bool publicize = true);
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  void remove_class(Klass* k);
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  bool contains_klass(Klass* k);
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   388
  void record_dependency(const Klass* to);
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   389
  PackageEntryTable* packages() { return _packages; }
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   390
  ModuleEntry* unnamed_module() { return _unnamed_module; }
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  ModuleEntryTable* modules();
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   392
  bool modules_defined() { return (_modules != NULL); }
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   393
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  // Loaded class dictionary
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  Dictionary* dictionary() const { return _dictionary; }
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   396
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  void add_to_deallocate_list(Metadata* m);
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   398
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  static ClassLoaderData* class_loader_data(oop loader);
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   400
  static ClassLoaderData* class_loader_data_or_null(oop loader);
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   401
  static ClassLoaderData* anonymous_class_loader_data(Handle loader);
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   402
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   403
  // Returns Klass* of associated class loader, or NULL if associated loader is 'bootstrap'.
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   404
  // Also works if unloading.
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   405
  Klass* class_loader_klass() const { return _class_loader_klass; }
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   406
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   407
  // Returns the class loader's explict name as specified during
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   408
  // construction or the class loader's qualified class name.
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   409
  // Works during unloading.
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  const char* loader_name() const;
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   411
  // Returns the explicitly specified class loader name or NULL.
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  Symbol* name() const { return _name; }
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diff changeset
   413
c349d409262a 8202605: Standardize on ClassLoaderData::loader_name() throughout the VM to obtain a class loader's name
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   414
  // Obtain the class loader's _name_and_id, works during unloading.
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   415
  const char* loader_name_and_id() const;
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   416
  Symbol* name_and_id() const { return _name_and_id; }
50302
fd2fccf3b079 8203455: jcmd: VM.metaspace: print loader name for anonymous CLDs
stuefe
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   417
50113
caf115bb98ad 8199712: Flight Recorder
egahlin
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   418
  JFR_ONLY(DEFINE_TRACE_ID_METHODS;)
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   419
};
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   420
25492
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   421
// An iterator that distributes Klasses to parallel worker threads.
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   422
class ClassLoaderDataGraphKlassIteratorAtomic : public StackObj {
29469
2213171cca5b 8074561: Wrong volatile qualifier for field ClassLoaderDataGraphKlassIteratorAtomic::_next_klass
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   423
 Klass* volatile _next_klass;
25492
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   424
 public:
d27050bdfb04 8049421: G1 Class Unloading after completing a concurrent mark cycle
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   425
  ClassLoaderDataGraphKlassIteratorAtomic();
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   426
  Klass* next_klass();
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stefank
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   427
 private:
d27050bdfb04 8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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   428
  static Klass* next_klass_in_cldg(Klass* klass);
d27050bdfb04 8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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   429
};
d27050bdfb04 8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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diff changeset
   430
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   431
class ClassLoaderDataGraphMetaspaceIterator : public StackObj {
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   432
  ClassLoaderData* _data;
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   433
 public:
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   434
  ClassLoaderDataGraphMetaspaceIterator();
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   435
  ~ClassLoaderDataGraphMetaspaceIterator();
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   436
  bool repeat() { return _data != NULL; }
49401
0c71baee49a7 8199431: Split up class Metaspace into a static and a non-static part
stuefe
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   437
  ClassLoaderMetaspace* get_next() {
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   438
    assert(_data != NULL, "Should not be NULL in call to the iterator");
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0c71baee49a7 8199431: Split up class Metaspace into a static and a non-static part
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parents: 49364
diff changeset
   439
    ClassLoaderMetaspace* result = _data->metaspace_or_null();
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   440
    _data = _data->next();
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   441
    // This result might be NULL for class loaders without metaspace
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   442
    // yet.  It would be nice to return only non-null results but
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   443
    // there is no guarantee that there will be a non-null result
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   444
    // down the list so the caller is going to have to check.
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   445
    return result;
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   446
  }
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   447
};
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   448
#endif // SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP