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8187443: Forest Consolidation: Move files to unified layout

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Reviewed-by: darcy, ihse
This commit is contained in:
Erik Joelsson 2017-09-12 19:03:39 +02:00
parent 270fe13182
commit 3789983e89
56923 changed files with 3 additions and 15727 deletions
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hotspot/src/share/vm/classfile/classLoaderData.hpp
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@ -1,419 +0,0 @@
/*
* Copyright (c) 2012, 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#ifndef SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP
#define SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP
#include "memory/allocation.hpp"
#include "memory/memRegion.hpp"
#include "memory/metaspace.hpp"
#include "memory/metaspaceCounters.hpp"
#include "oops/oopHandle.hpp"
#include "runtime/mutex.hpp"
#include "trace/traceMacros.hpp"
#include "utilities/growableArray.hpp"
#include "utilities/macros.hpp"
#if INCLUDE_TRACE
#include "utilities/ticks.hpp"
#endif
//
// A class loader represents a linkset. Conceptually, a linkset identifies
// the complete transitive closure of resolved links that a dynamic linker can
// produce.
//
// A ClassLoaderData also encapsulates the allocation space, called a metaspace,
// used by the dynamic linker to allocate the runtime representation of all
// the types it defines.
//
// ClassLoaderData are stored in the runtime representation of classes,
// and provides iterators for root tracing and other GC operations.
class ClassLoaderData;
class JNIMethodBlock;
class Metadebug;
class ModuleEntry;
class PackageEntry;
class ModuleEntryTable;
class PackageEntryTable;
class DictionaryEntry;
class Dictionary;
// GC root for walking class loader data created
class ClassLoaderDataGraph : public AllStatic {
friend class ClassLoaderData;
friend class ClassLoaderDataGraphMetaspaceIterator;
friend class ClassLoaderDataGraphKlassIteratorAtomic;
friend class ClassLoaderDataGraphKlassIteratorStatic;
friend class VMStructs;
private:
// All CLDs (except the null CLD) can be reached by walking _head->_next->...
static ClassLoaderData* _head;
static ClassLoaderData* _unloading;
// CMS support.
static ClassLoaderData* _saved_head;
static ClassLoaderData* _saved_unloading;
static bool _should_purge;
// OOM has been seen in metaspace allocation. Used to prevent some
// allocations until class unloading
static bool _metaspace_oom;
static ClassLoaderData* add(Handle class_loader, bool anonymous, TRAPS);
static void post_class_unload_events();
public:
static ClassLoaderData* find_or_create(Handle class_loader, TRAPS);
static void purge();
static void clear_claimed_marks();
// oops do
static void oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim);
static void keep_alive_oops_do(OopClosure* blk, KlassClosure* klass_closure, bool must_claim);
static void always_strong_oops_do(OopClosure* blk, KlassClosure* klass_closure, bool must_claim);
// cld do
static void cld_do(CLDClosure* cl);
static void cld_unloading_do(CLDClosure* cl);
static void roots_cld_do(CLDClosure* strong, CLDClosure* weak);
static void keep_alive_cld_do(CLDClosure* cl);
static void always_strong_cld_do(CLDClosure* cl);
// klass do
// Walking classes through the ClassLoaderDataGraph include array classes. It also includes
// classes that are allocated but not loaded, classes that have errors, and scratch classes
// for redefinition. These classes are removed during the next class unloading.
// Walking the ClassLoaderDataGraph also includes anonymous classes.
static void classes_do(KlassClosure* klass_closure);
static void classes_do(void f(Klass* const));
static void methods_do(void f(Method*));
static void modules_do(void f(ModuleEntry*));
static void modules_unloading_do(void f(ModuleEntry*));
static void packages_do(void f(PackageEntry*));
static void packages_unloading_do(void f(PackageEntry*));
static void loaded_classes_do(KlassClosure* klass_closure);
static void classes_unloading_do(void f(Klass* const));
static bool do_unloading(BoolObjectClosure* is_alive, bool clean_previous_versions);
// dictionary do
// Iterate over all klasses in dictionary, but
// just the classes from defining class loaders.
static void dictionary_classes_do(void f(InstanceKlass*));
// Added for initialize_itable_for_klass to handle exceptions.
static void dictionary_classes_do(void f(InstanceKlass*, TRAPS), TRAPS);
// Iterate all classes and their class loaders, including initiating class loaders.
static void dictionary_all_entries_do(void f(InstanceKlass*, ClassLoaderData*));
// VM_CounterDecay iteration support
static InstanceKlass* try_get_next_class();
static void verify_dictionary();
static void print_dictionary(outputStream* st);
static void print_dictionary_statistics(outputStream* st);
// CMS support.
static void remember_new_clds(bool remember) { _saved_head = (remember ? _head : NULL); }
static GrowableArray<ClassLoaderData*>* new_clds();
static void set_should_purge(bool b) { _should_purge = b; }
static void purge_if_needed() {
// Only purge the CLDG for CMS if concurrent sweep is complete.
if (_should_purge) {
purge();
// reset for next time.
set_should_purge(false);
}
}
static bool has_metaspace_oom() { return _metaspace_oom; }
static void set_metaspace_oom(bool value) { _metaspace_oom = value; }
static void dump_on(outputStream * const out) PRODUCT_RETURN;
static void dump() { dump_on(tty); }
static void verify();
static void print_creation(outputStream* out, Handle loader, ClassLoaderData* cld, TRAPS);
static bool unload_list_contains(const void* x);
#ifndef PRODUCT
static bool contains_loader_data(ClassLoaderData* loader_data);
#endif
#if INCLUDE_TRACE
private:
static Ticks _class_unload_time;
static void class_unload_event(Klass* const k);
#endif
};
// ClassLoaderData class
class ClassLoaderData : public CHeapObj<mtClass> {
friend class VMStructs;
private:
class Dependencies VALUE_OBJ_CLASS_SPEC {
objArrayOop _list_head;
void locked_add(objArrayHandle last,
objArrayHandle new_dependency,
Thread* THREAD);
public:
Dependencies() : _list_head(NULL) {}
Dependencies(TRAPS) : _list_head(NULL) {
init(CHECK);
}
void add(Handle dependency, TRAPS);
void init(TRAPS);
void oops_do(OopClosure* f);
};
class ChunkedHandleList VALUE_OBJ_CLASS_SPEC {
struct Chunk : public CHeapObj<mtClass> {
static const size_t CAPACITY = 32;
oop _data[CAPACITY];
volatile juint _size;
Chunk* _next;
Chunk(Chunk* c) : _next(c), _size(0) { }
};
Chunk* _head;
void oops_do_chunk(OopClosure* f, Chunk* c, const juint size);
public:
ChunkedHandleList() : _head(NULL) {}
~ChunkedHandleList();
// Only one thread at a time can add, guarded by ClassLoaderData::metaspace_lock().
// However, multiple threads can execute oops_do concurrently with add.
oop* add(oop o);
#ifdef ASSERT
bool contains(oop* p);
#endif
void oops_do(OopClosure* f);
};
friend class ClassLoaderDataGraph;
friend class ClassLoaderDataGraphKlassIteratorAtomic;
friend class ClassLoaderDataGraphKlassIteratorStatic;
friend class ClassLoaderDataGraphMetaspaceIterator;
friend class MetaDataFactory;
friend class Method;
static ClassLoaderData * _the_null_class_loader_data;
oop _class_loader; // oop used to uniquely identify a class loader
// class loader or a canonical class path
Dependencies _dependencies; // holds dependencies from this class loader
// data to others.
Metaspace * volatile _metaspace; // Meta-space where meta-data defined by the
// classes in the class loader are allocated.
Mutex* _metaspace_lock; // Locks the metaspace for allocations and setup.
bool _unloading; // true if this class loader goes away
bool _is_anonymous; // if this CLD is for an anonymous class
s2 _keep_alive; // if this CLD is kept alive without a keep_alive_object().
// Used for anonymous classes and the boot class
// loader. _keep_alive does not need to be volatile or
// atomic since there is one unique CLD per anonymous class.
volatile int _claimed; // true if claimed, for example during GC traces.
// To avoid applying oop closure more than once.
// Has to be an int because we cas it.
ChunkedHandleList _handles; // Handles to constant pool arrays, Modules, etc, which
// have the same life cycle of the corresponding ClassLoader.
Klass* volatile _klasses; // The classes defined by the class loader.
PackageEntryTable* volatile _packages; // The packages defined by the class loader.
ModuleEntryTable* volatile _modules; // The modules defined by the class loader.
ModuleEntry* _unnamed_module; // This class loader's unnamed module.
Dictionary* _dictionary; // The loaded InstanceKlasses, including initiated by this class loader
// These method IDs are created for the class loader and set to NULL when the
// class loader is unloaded. They are rarely freed, only for redefine classes
// and if they lose a data race in InstanceKlass.
JNIMethodBlock* _jmethod_ids;
// Metadata to be deallocated when it's safe at class unloading, when
// this class loader isn't unloaded itself.
GrowableArray<Metadata*>* _deallocate_list;
// Support for walking class loader data objects
ClassLoaderData* _next; /// Next loader_datas created
// ReadOnly and ReadWrite metaspaces (static because only on the null
// class loader for now).
static Metaspace* _ro_metaspace;
static Metaspace* _rw_metaspace;
TRACE_DEFINE_TRACE_ID_FIELD;
void set_next(ClassLoaderData* next) { _next = next; }
ClassLoaderData* next() const { return _next; }
ClassLoaderData(Handle h_class_loader, bool is_anonymous, Dependencies dependencies);
~ClassLoaderData();
// GC interface.
void clear_claimed() { _claimed = 0; }
bool claimed() const { return _claimed == 1; }
bool claim();
void unload();
bool keep_alive() const { return _keep_alive > 0; }
void classes_do(void f(Klass*));
void loaded_classes_do(KlassClosure* klass_closure);
void classes_do(void f(InstanceKlass*));
void methods_do(void f(Method*));
void modules_do(void f(ModuleEntry*));
void packages_do(void f(PackageEntry*));
// Deallocate free list during class unloading.
void free_deallocate_list();
// Allocate out of this class loader data
MetaWord* allocate(size_t size);
Dictionary* create_dictionary();
public:
bool is_alive(BoolObjectClosure* is_alive_closure) const;
// Accessors
Metaspace* metaspace_or_null() const { return _metaspace; }
static ClassLoaderData* the_null_class_loader_data() {
return _the_null_class_loader_data;
}
Mutex* metaspace_lock() const { return _metaspace_lock; }
bool is_anonymous() const { return _is_anonymous; }
static void init_null_class_loader_data() {
assert(_the_null_class_loader_data == NULL, "cannot initialize twice");
assert(ClassLoaderDataGraph::_head == NULL, "cannot initialize twice");
// We explicitly initialize the Dependencies object at a later phase in the initialization
_the_null_class_loader_data = new ClassLoaderData(Handle(), false, Dependencies());
ClassLoaderDataGraph::_head = _the_null_class_loader_data;
assert(_the_null_class_loader_data->is_the_null_class_loader_data(), "Must be");
}
bool is_the_null_class_loader_data() const {
return this == _the_null_class_loader_data;
}
bool is_system_class_loader_data() const;
bool is_platform_class_loader_data() const;
bool is_builtin_class_loader_data() const;
// The Metaspace is created lazily so may be NULL. This
// method will allocate a Metaspace if needed.
Metaspace* metaspace_non_null();
oop class_loader() const { return _class_loader; }
// The object the GC is using to keep this ClassLoaderData alive.
oop keep_alive_object() const;
// Returns true if this class loader data is for a loader going away.
bool is_unloading() const {
assert(!(is_the_null_class_loader_data() && _unloading), "The null class loader can never be unloaded");
return _unloading;
}
// Used to refcount an anonymous class's CLD in order to
// indicate their aliveness without a keep_alive_object().
void inc_keep_alive();
void dec_keep_alive();
inline unsigned int identity_hash() const { return (unsigned int)(((intptr_t)this) >> 3); }
// Used when tracing from klasses.
void oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim);
void classes_do(KlassClosure* klass_closure);
Klass* klasses() { return _klasses; }
JNIMethodBlock* jmethod_ids() const { return _jmethod_ids; }
void set_jmethod_ids(JNIMethodBlock* new_block) { _jmethod_ids = new_block; }
void print() { print_on(tty); }
void print_on(outputStream* out) const;
void print_value() { print_value_on(tty); }
void print_value_on(outputStream* out) const;
void dump(outputStream * const out) PRODUCT_RETURN;
void verify();
const char* loader_name();
OopHandle add_handle(Handle h);
void remove_handle(OopHandle h);
void init_handle_locked(OopHandle& pd, Handle h); // used for concurrent access to ModuleEntry::_pd field
void add_class(Klass* k, bool publicize = true);
void remove_class(Klass* k);
bool contains_klass(Klass* k);
void record_dependency(const Klass* to, TRAPS);
void init_dependencies(TRAPS);
PackageEntryTable* packages() { return _packages; }
ModuleEntry* unnamed_module() { return _unnamed_module; }
ModuleEntryTable* modules();
bool modules_defined() { return (_modules != NULL); }
// Loaded class dictionary
Dictionary* dictionary() const { return _dictionary; }
void add_to_deallocate_list(Metadata* m);
static ClassLoaderData* class_loader_data(oop loader);
static ClassLoaderData* class_loader_data_or_null(oop loader);
static ClassLoaderData* anonymous_class_loader_data(oop loader, TRAPS);
static void print_loader(ClassLoaderData *loader_data, outputStream *out);
TRACE_DEFINE_TRACE_ID_METHODS;
};
// An iterator that distributes Klasses to parallel worker threads.
class ClassLoaderDataGraphKlassIteratorAtomic : public StackObj {
Klass* volatile _next_klass;
public:
ClassLoaderDataGraphKlassIteratorAtomic();
Klass* next_klass();
private:
static Klass* next_klass_in_cldg(Klass* klass);
};
class ClassLoaderDataGraphMetaspaceIterator : public StackObj {
ClassLoaderData* _data;
public:
ClassLoaderDataGraphMetaspaceIterator();
~ClassLoaderDataGraphMetaspaceIterator();
bool repeat() { return _data != NULL; }
Metaspace* get_next() {
assert(_data != NULL, "Should not be NULL in call to the iterator");
Metaspace* result = _data->metaspace_or_null();
_data = _data->next();
// This result might be NULL for class loaders without metaspace
// yet. It would be nice to return only non-null results but
// there is no guarantee that there will be a non-null result
// down the list so the caller is going to have to check.
return result;
}
};
#endif // SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP