author | jwilhelm |
Sat, 19 Mar 2016 01:23:46 +0100 | |
changeset 37155 | f00f299cb386 |
parent 35917 | 463d67f86eaa |
child 36508 | 5f9eee6b383b |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2012, 2016, 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 "memory/metaspaceCounters.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_TRACE |
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#include "utilities/ticks.hpp" |
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#endif |
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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 and the |
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// system dictionary, are roots of garbage collection, and provides iterators |
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// for root tracing and other GC operations. |
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class ClassLoaderData; |
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class JNIMethodBlock; |
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class JNIHandleBlock; |
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class Metadebug; |
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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 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 ClassLoaderData* add(Handle class_loader, bool anonymous, TRAPS); |
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static void post_class_unload_events(void); |
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public: |
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static ClassLoaderData* find_or_create(Handle class_loader, TRAPS); |
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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, KlassClosure* klass_closure, bool must_claim); |
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static void keep_alive_oops_do(OopClosure* blk, KlassClosure* klass_closure, bool must_claim); |
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static void always_strong_oops_do(OopClosure* blk, KlassClosure* klass_closure, 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 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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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 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(BoolObjectClosure* is_alive, bool clean_previous_versions); |
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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 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 dump_on(outputStream * const out) PRODUCT_RETURN; |
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static void dump() { dump_on(tty); } |
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static void verify(); |
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static void log_creation(Handle loader, ClassLoaderData* cld, TRAPS); |
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static bool unload_list_contains(const void* x); |
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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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#if INCLUDE_TRACE |
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private: |
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static Ticks _class_unload_time; |
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static void class_unload_event(Klass* const k); |
130 |
#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 Dependencies VALUE_OBJ_CLASS_SPEC { |
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objArrayOop _list_head; |
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void locked_add(objArrayHandle last, |
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objArrayHandle new_dependency, |
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Thread* THREAD); |
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public: |
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Dependencies() : _list_head(NULL) {} |
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Dependencies(TRAPS) : _list_head(NULL) { |
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init(CHECK); |
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} |
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void add(Handle dependency, TRAPS); |
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void init(TRAPS); |
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void oops_do(OopClosure* f); |
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}; |
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friend class ClassLoaderDataGraph; |
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friend class ClassLoaderDataGraphKlassIteratorAtomic; |
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friend class ClassLoaderDataGraphMetaspaceIterator; |
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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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oop _class_loader; // oop used to uniquely identify a class loader |
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// class loader or a canonical class path |
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Dependencies _dependencies; // holds dependencies from this class loader |
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// data to others. |
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Metaspace * _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 _keep_alive; // if this CLD is kept alive without a keep_alive_object(). |
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bool _is_anonymous; // if this CLD is for an 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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Klass* _klasses; // The classes defined by the class loader. |
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JNIHandleBlock* _handles; // Handles to constant pool arrays |
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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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|
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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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// CDS |
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int _shared_class_loader_id; |
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// ReadOnly and ReadWrite metaspaces (static because only on the null |
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// class loader for now). |
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static Metaspace* _ro_metaspace; |
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static Metaspace* _rw_metaspace; |
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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, Dependencies dependencies); |
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~ClassLoaderData(); |
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void set_metaspace(Metaspace* m) { _metaspace = m; } |
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JNIHandleBlock* handles() const; |
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void set_handles(JNIHandleBlock* handles); |
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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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void unload(); |
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bool keep_alive() const { return _keep_alive; } |
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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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// Deallocate free list during class unloading. |
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void free_deallocate_list(); |
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// Allocate out of this class loader data |
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MetaWord* allocate(size_t size); |
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public: |
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bool is_alive(BoolObjectClosure* is_alive_closure) const; |
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// Accessors |
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Metaspace* 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; } |
240 |
||
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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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assert(_the_null_class_loader_data == NULL, "cannot initialize twice"); |
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assert(ClassLoaderDataGraph::_head == NULL, "cannot initialize twice"); |
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// We explicitly initialize the Dependencies object at a later phase in the initialization |
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_the_null_class_loader_data = new ClassLoaderData((oop)NULL, false, Dependencies()); |
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ClassLoaderDataGraph::_head = _the_null_class_loader_data; |
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assert(_the_null_class_loader_data->is_the_null_class_loader_data(), "Must be"); |
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if (DumpSharedSpaces) { |
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_the_null_class_loader_data->initialize_shared_metaspaces(); |
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} |
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} |
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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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bool is_ext_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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Metaspace* metaspace_non_null(); |
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oop class_loader() const { return _class_loader; } |
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// The object the GC is using to keep this ClassLoaderData alive. |
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oop keep_alive_object() 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 make sure that this CLD is not unloaded. |
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void set_keep_alive(bool value) { _keep_alive = value; } |
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inline unsigned int identity_hash() const; |
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// Used when tracing from klasses. |
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void oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim); |
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void classes_do(KlassClosure* klass_closure); |
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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_value() { print_value_on(tty); } |
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void print_value_on(outputStream* out) const; |
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void dump(outputStream * const out) PRODUCT_RETURN; |
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void verify(); |
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const char* loader_name(); |
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jobject add_handle(Handle h); |
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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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void record_dependency(const Klass* to, TRAPS); |
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void init_dependencies(TRAPS); |
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void add_to_deallocate_list(Metadata* m); |
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static ClassLoaderData* class_loader_data(oop loader); |
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static ClassLoaderData* class_loader_data_or_null(oop loader); |
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static ClassLoaderData* anonymous_class_loader_data(oop loader, TRAPS); |
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static void print_loader(ClassLoaderData *loader_data, outputStream *out); |
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// CDS support |
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Metaspace* ro_metaspace(); |
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Metaspace* rw_metaspace(); |
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void initialize_shared_metaspaces(); |
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int shared_class_loader_id() const { |
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return _shared_class_loader_id; |
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} |
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void set_shared_class_loader_id(int id) { |
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assert(id >= 0, "sanity"); |
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assert(_shared_class_loader_id <0, "cannot be assigned more than once"); |
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_shared_class_loader_id = id; |
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} |
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}; |
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// An iterator that distributes Klasses to parallel worker threads. |
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class ClassLoaderDataGraphKlassIteratorAtomic : public StackObj { |
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Klass* volatile _next_klass; |
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public: |
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ClassLoaderDataGraphKlassIteratorAtomic(); |
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Klass* next_klass(); |
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private: |
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static Klass* next_klass_in_cldg(Klass* klass); |
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}; |
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class ClassLoaderDataGraphMetaspaceIterator : public StackObj { |
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ClassLoaderData* _data; |
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public: |
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ClassLoaderDataGraphMetaspaceIterator(); |
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~ClassLoaderDataGraphMetaspaceIterator(); |
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bool repeat() { return _data != NULL; } |
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Metaspace* get_next() { |
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assert(_data != NULL, "Should not be NULL in call to the iterator"); |
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Metaspace* result = _data->metaspace_or_null(); |
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_data = _data->next(); |
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// This result might be NULL for class loaders without metaspace |
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// yet. It would be nice to return only non-null results but |
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// there is no guarantee that there will be a non-null result |
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// down the list so the caller is going to have to check. |
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return result; |
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} |
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}; |
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#endif // SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP |