author | eosterlund |
Mon, 10 Sep 2018 13:07:42 +0200 | |
changeset 51681 | 72bdaf11dd6a |
parent 51608 | 625a5bdde0c5 |
child 51682 | a30461a359f5 |
permissions | -rw-r--r-- |
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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 ClassLoaderDataGraphIterator; |
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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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// Set if there's anything to purge in the deallocate lists or previous versions |
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// during a safepoint after class unloading in a full GC. |
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static bool _should_clean_deallocate_lists; |
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static bool _safepoint_cleanup_needed; |
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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 is_unsafe_anonymous); |
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static ClassLoaderData* add(Handle class_loader, bool is_unsafe_anonymous); |
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public: |
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static ClassLoaderData* find_or_create(Handle class_loader); |
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static void clean_module_and_package_info(); |
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static void purge(); |
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static void clear_claimed_marks(); |
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// Iteration through CLDG inside a safepoint; GC support |
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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 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 unsafe 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 unlocked_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 do_cleaning); |
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// Expose state to avoid logging overhead in safepoint cleanup tasks. |
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static inline bool should_clean_metaspaces_and_reset(); |
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static void set_should_clean_deallocate_lists() { _should_clean_deallocate_lists = true; } |
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static void clean_deallocate_lists(bool purge_previous_versions); |
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static void walk_metadata_and_clean_metaspaces(); |
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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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// 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(); |
161 |
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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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164 |
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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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class LockedClassesDo : public KlassClosure { |
183 |
typedef void (*classes_do_func_t)(Klass*); |
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classes_do_func_t _function; |
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public: |
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LockedClassesDo(); // For callers who provide their own do_klass |
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LockedClassesDo(classes_do_func_t function); |
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~LockedClassesDo(); |
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189 |
||
190 |
void do_klass(Klass* k) { |
|
191 |
(*_function)(k); |
|
192 |
} |
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}; |
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194 |
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195 |
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// ClassLoaderData class |
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197 |
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class ClassLoaderData : public CHeapObj<mtClass> { |
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friend class VMStructs; |
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200 |
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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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205 |
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oop _data[CAPACITY]; |
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volatile juint _size; |
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Chunk* _next; |
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209 |
|
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Chunk(Chunk* c) : _size(0), _next(c) { } |
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}; |
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212 |
|
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Chunk* volatile _head; |
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214 |
|
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void oops_do_chunk(OopClosure* f, Chunk* c, const juint size); |
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216 |
|
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217 |
public: |
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ChunkedHandleList() : _head(NULL) {} |
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~ChunkedHandleList(); |
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220 |
|
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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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|
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int count() const; |
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229 |
}; |
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230 |
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friend class ClassLoaderDataGraph; |
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friend class ClassLoaderDataGraphIterator; |
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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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239 |
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static ClassLoaderData * _the_null_class_loader_data; |
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241 |
|
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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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245 |
|
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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_unsafe_anonymous; // CLD is dedicated to one class and that class determines the CLDs lifecycle. |
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// For example, an unsafe anonymous class. |
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|
253 |
// Remembered sets support for the oops in the class loader data. |
|
254 |
bool _modified_oops; // Card Table Equivalent (YC/CMS support) |
|
255 |
bool _accumulated_modified_oops; // Mod Union Equivalent (CMS support) |
|
256 |
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s2 _keep_alive; // if this CLD is kept alive. |
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// Used for unsafe 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 unsafe anonymous class. |
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|
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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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|
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NOT_PRODUCT(volatile int _dependency_count;) // number of class loader dependencies |
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269 |
|
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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. |
46729 | 272 |
ModuleEntryTable* volatile _modules; // The modules defined by the class loader. |
46387 | 273 |
ModuleEntry* _unnamed_module; // This class loader's unnamed module. |
46729 | 274 |
Dictionary* _dictionary; // The loaded InstanceKlasses, including initiated by this class loader |
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|
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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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284 |
|
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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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287 |
|
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Klass* _class_loader_klass; |
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Symbol* _name; |
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290 |
Symbol* _name_and_id; |
50113 | 291 |
JFR_ONLY(DEFINE_TRACE_ID_FIELD;) |
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292 |
|
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void set_next(ClassLoaderData* next) { _next = next; } |
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ClassLoaderData* next() const { return _next; } |
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295 |
|
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ClassLoaderData(Handle h_class_loader, bool is_unsafe_anonymous); |
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~ClassLoaderData(); |
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298 |
|
47580 | 299 |
// The CLD are not placed in the Heap, so the Card Table or |
300 |
// the Mod Union Table can't be used to mark when CLD have modified oops. |
|
301 |
// The CT and MUT bits saves this information for the whole class loader data. |
|
302 |
void clear_modified_oops() { _modified_oops = false; } |
|
303 |
public: |
|
304 |
void record_modified_oops() { _modified_oops = true; } |
|
305 |
bool has_modified_oops() { return _modified_oops; } |
|
306 |
||
307 |
void accumulate_modified_oops() { if (has_modified_oops()) _accumulated_modified_oops = true; } |
|
308 |
void clear_accumulated_modified_oops() { _accumulated_modified_oops = false; } |
|
309 |
bool has_accumulated_modified_oops() { return _accumulated_modified_oops; } |
|
310 |
private: |
|
311 |
||
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void unload(); |
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bool keep_alive() const { return _keep_alive > 0; } |
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314 |
|
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315 |
oop holder_phantom() const; |
18025 | 316 |
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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319 |
void methods_do(void f(Method*)); |
36508 | 320 |
void modules_do(void f(ModuleEntry*)); |
321 |
void packages_do(void f(PackageEntry*)); |
|
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322 |
|
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323 |
// Deallocate free list during class unloading. |
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324 |
void free_deallocate_list(); // for the classes that are not unloaded |
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325 |
void free_deallocate_list_C_heap_structures(); // for the classes that are unloaded |
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326 |
|
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327 |
// Allocate out of this class loader data |
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|
328 |
MetaWord* allocate(size_t size); |
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|
329 |
|
46729 | 330 |
Dictionary* create_dictionary(); |
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331 |
|
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|
332 |
void initialize_name(Handle class_loader); |
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333 |
public: |
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|
334 |
// GC interface. |
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|
335 |
void clear_claimed() { _claimed = 0; } |
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336 |
bool claimed() const { return _claimed == 1; } |
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|
337 |
bool claim(); |
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|
338 |
|
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|
339 |
// Computes if the CLD is alive or not. This is safe to call in concurrent |
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|
340 |
// contexts. |
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|
341 |
bool is_alive() const; |
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|
342 |
|
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|
343 |
// Accessors |
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|
344 |
ClassLoaderMetaspace* metaspace_or_null() const { return _metaspace; } |
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|
345 |
|
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|
346 |
static ClassLoaderData* the_null_class_loader_data() { |
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|
347 |
return _the_null_class_loader_data; |
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|
348 |
} |
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|
349 |
|
25325 | 350 |
Mutex* metaspace_lock() const { return _metaspace_lock; } |
351 |
||
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|
352 |
bool is_unsafe_anonymous() const { return _is_unsafe_anonymous; } |
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|
353 |
|
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|
354 |
static void init_null_class_loader_data(); |
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|
355 |
|
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|
356 |
bool is_the_null_class_loader_data() const { |
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|
357 |
return this == _the_null_class_loader_data; |
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|
358 |
} |
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|
359 |
|
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|
360 |
// Returns true if this class loader data is for the system class loader. |
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|
361 |
// (Note that the class loader data may be unsafe anonymous.) |
39616
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|
362 |
bool is_system_class_loader_data() const; |
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|
363 |
|
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|
364 |
// Returns true if this class loader data is for the platform class loader. |
51444
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changeset
|
365 |
// (Note that the class loader data may be unsafe anonymous.) |
36508 | 366 |
bool is_platform_class_loader_data() const; |
48871
120d6893f32f
8190235: Clarify ClassLoaderData::is_*_class_loader_data() method implementations
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diff
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|
367 |
|
120d6893f32f
8190235: Clarify ClassLoaderData::is_*_class_loader_data() method implementations
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|
368 |
// Returns true if this class loader data is for the boot class loader. |
51444
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|
369 |
// (Note that the class loader data may be unsafe anonymous.) |
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|
370 |
inline bool is_boot_class_loader_data() const; |
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8190235: Clarify ClassLoaderData::is_*_class_loader_data() method implementations
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changeset
|
371 |
|
39616
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8159262: Walking PackageEntry Export and ModuleEntry Reads Must Occur Only When Neccessary And Wait Until ClassLoader's Aliveness Determined
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|
372 |
bool is_builtin_class_loader_data() const; |
48860
5bce1b7e7800
8190359: Reduce the number of recorded klass dependencies
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|
373 |
bool is_permanent_class_loader_data() const; |
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|
374 |
|
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|
375 |
// The Metaspace is created lazily so may be NULL. This |
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|
376 |
// method will allocate a Metaspace if needed. |
49401
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8199431: Split up class Metaspace into a static and a non-static part
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changeset
|
377 |
ClassLoaderMetaspace* metaspace_non_null(); |
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|
378 |
|
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|
379 |
inline oop class_loader() const; |
22900 | 380 |
|
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|
381 |
// Returns true if this class loader data is for a loader going away. |
51681
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8210233: Prepare Klass::is_loader_alive() for concurrent class unloading
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parents:
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diff
changeset
|
382 |
// Note that this is only safe after the GC has computed if the CLD is |
72bdaf11dd6a
8210233: Prepare Klass::is_loader_alive() for concurrent class unloading
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parents:
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diff
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|
383 |
// unloading or not. In concurrent contexts where there are no such |
72bdaf11dd6a
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parents:
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diff
changeset
|
384 |
// guarantees, is_alive() should be used instead. |
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|
385 |
bool is_unloading() const { |
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diff
changeset
|
386 |
assert(!(is_the_null_class_loader_data() && _unloading), "The null class loader can never be unloaded"); |
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|
387 |
return _unloading; |
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changeset
|
388 |
} |
22900 | 389 |
|
51444
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changeset
|
390 |
// Used to refcount an unsafe anonymous class's CLD in order to |
49824
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|
391 |
// indicate their aliveness. |
38014
8731fa11f766
8152949: Jigsaw crash when Klass in _fixup_module_field_list is unloaded
lfoltan
parents:
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diff
changeset
|
392 |
void inc_keep_alive(); |
8731fa11f766
8152949: Jigsaw crash when Klass in _fixup_module_field_list is unloaded
lfoltan
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diff
changeset
|
393 |
void dec_keep_alive(); |
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|
394 |
|
49738
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changeset
|
395 |
void initialize_holder(Handle holder); |
a7bc87a63dd8
8198313: Wrap holder object for ClassLoaderData in a WeakHandle
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changeset
|
396 |
|
47580 | 397 |
void oops_do(OopClosure* f, bool must_claim, bool clear_modified_oops = false); |
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|
398 |
|
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changeset
|
399 |
void classes_do(KlassClosure* klass_closure); |
46729 | 400 |
Klass* klasses() { return _klasses; } |
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changeset
|
401 |
|
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changeset
|
402 |
JNIMethodBlock* jmethod_ids() const { return _jmethod_ids; } |
882756847a04
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coleenp
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diff
changeset
|
403 |
void set_jmethod_ids(JNIMethodBlock* new_block) { _jmethod_ids = new_block; } |
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|
404 |
|
46729 | 405 |
void print() { print_on(tty); } |
49348
fde3feaaa4ed
8198926: Move ClassLoaderData::_dependencies to ClassLoaderData::_handles
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diff
changeset
|
406 |
void print_on(outputStream* out) const PRODUCT_RETURN; |
46729 | 407 |
void print_value() { print_value_on(tty); } |
15437 | 408 |
void print_value_on(outputStream* out) const; |
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|
409 |
void verify(); |
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diff
changeset
|
410 |
|
46961
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8186088: ConstantPoolCache::_resolved_references is not a JNIHandle
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diff
changeset
|
411 |
OopHandle add_handle(Handle h); |
47095
9d21da6fe729
8181170: resolved_references array leaks for RedefineClasses
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changeset
|
412 |
void remove_handle(OopHandle h); |
46961
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8186088: ConstantPoolCache::_resolved_references is not a JNIHandle
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|
413 |
void init_handle_locked(OopHandle& pd, Handle h); // used for concurrent access to ModuleEntry::_pd field |
34666 | 414 |
void add_class(Klass* k, bool publicize = true); |
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|
415 |
void remove_class(Klass* k); |
22794
f1c014ad3754
8027146: Class loading verification failure if GC occurs in Universe::flush_dependents_on
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parents:
22201
diff
changeset
|
416 |
bool contains_klass(Klass* k); |
49348
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8198926: Move ClassLoaderData::_dependencies to ClassLoaderData::_handles
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diff
changeset
|
417 |
void record_dependency(const Klass* to); |
46420
227f72691ac1
8179235: PackageEntryTables should be created eagerly
hseigel
parents:
46387
diff
changeset
|
418 |
PackageEntryTable* packages() { return _packages; } |
46387 | 419 |
ModuleEntry* unnamed_module() { return _unnamed_module; } |
36508 | 420 |
ModuleEntryTable* modules(); |
421 |
bool modules_defined() { return (_modules != NULL); } |
|
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// Loaded class dictionary |
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Dictionary* dictionary() const { return _dictionary; } |
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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* unsafe_anonymous_class_loader_data(Handle loader); |
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// Returns Klass* of associated class loader, or NULL if associated loader is 'bootstrap'. |
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// Also works if unloading. |
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Klass* class_loader_klass() const { return _class_loader_klass; } |
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// Returns the class loader's explict name as specified during |
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// construction or the class loader's qualified class name. |
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// Works during unloading. |
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const char* loader_name() const; |
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// Returns the explicitly specified class loader name or NULL. |
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Symbol* name() const { return _name; } |
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// Obtain the class loader's _name_and_id, works during unloading. |
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const char* loader_name_and_id() const; |
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Symbol* name_and_id() const { return _name_and_id; } |
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JFR_ONLY(DEFINE_TRACE_ID_METHODS;) |
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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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ClassLoaderMetaspace* get_next() { |
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assert(_data != NULL, "Should not be NULL in call to the iterator"); |
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ClassLoaderMetaspace* 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 |