author | drwhite |
Tue, 05 Jul 2016 15:34:06 -0400 | |
changeset 39695 | 946f1321c075 |
parent 39616 | f82b1f888578 |
child 41183 | 207b92e69457 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 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_MODULEENTRY_HPP |
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#define SHARE_VM_CLASSFILE_MODULEENTRY_HPP |
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#include "classfile/classLoaderData.hpp" |
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#include "classfile/vmSymbols.hpp" |
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#include "oops/symbol.hpp" |
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#include "prims/jni.h" |
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#include "runtime/mutexLocker.hpp" |
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#include "trace/traceMacros.hpp" |
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#include "utilities/growableArray.hpp" |
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#include "utilities/hashtable.hpp" |
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#include "utilities/ostream.hpp" |
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#define UNNAMED_MODULE "Unnamed Module" |
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class ModuleClosure; |
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// A ModuleEntry describes a module that has been defined by a call to JVM_DefineModule. |
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// It contains: |
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// - Symbol* containing the module's name. |
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// - pointer to the java.lang.reflect.Module for this module. |
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// - pointer to the java.security.ProtectionDomain shared by classes defined to this module. |
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// - ClassLoaderData*, class loader of this module. |
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// - a growable array containg other module entries that this module can read. |
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// - a flag indicating if this module can read all unnamed modules. |
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// |
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// The Mutex Module_lock is shared between ModuleEntry and PackageEntry, to lock either |
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// data structure. |
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class ModuleEntry : public HashtableEntry<Symbol*, mtModule> { |
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private: |
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jobject _module; // java.lang.reflect.Module |
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jobject _pd; // java.security.ProtectionDomain, cached |
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// for shared classes from this module |
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ClassLoaderData* _loader_data; |
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GrowableArray<ModuleEntry*>* _reads; // list of modules that are readable by this module |
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Symbol* _version; // module version number |
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Symbol* _location; // module location |
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bool _can_read_all_unnamed; |
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bool _has_default_read_edges; // JVMTI redefine/retransform support |
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bool _must_walk_reads; // walk module's reads list at GC safepoints to purge out dead modules |
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TRACE_DEFINE_TRACE_ID_FIELD; |
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enum {MODULE_READS_SIZE = 101}; // Initial size of list of modules that the module can read. |
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public: |
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void init() { |
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_module = NULL; |
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_loader_data = NULL; |
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_pd = NULL; |
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_reads = NULL; |
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_version = NULL; |
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_location = NULL; |
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_can_read_all_unnamed = false; |
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_has_default_read_edges = false; |
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_must_walk_reads = false; |
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} |
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Symbol* name() const { return literal(); } |
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void set_name(Symbol* n) { set_literal(n); } |
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jobject module() const { return _module; } |
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void set_module(jobject j) { _module = j; } |
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// The shared ProtectionDomain reference is set once the VM loads a shared class |
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// originated from the current Module. The referenced ProtectionDomain object is |
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// created by the ClassLoader when loading a class (shared or non-shared) from the |
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// Module for the first time. This ProtectionDomain object is used for all |
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// classes from the Module loaded by the same ClassLoader. |
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Handle shared_protection_domain(); |
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void set_shared_protection_domain(ClassLoaderData *loader_data, Handle pd); |
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ClassLoaderData* loader_data() const { return _loader_data; } |
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void set_loader_data(ClassLoaderData* l) { _loader_data = l; } |
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Symbol* version() const { return _version; } |
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void set_version(Symbol* version); |
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Symbol* location() const { return _location; } |
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void set_location(Symbol* location); |
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bool can_read(ModuleEntry* m) const; |
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bool has_reads() const; |
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void add_read(ModuleEntry* m); |
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void set_read_walk_required(ClassLoaderData* m_loader_data); |
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bool is_named() const { return (name() != NULL); } |
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bool can_read_all_unnamed() const { |
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assert(is_named() || _can_read_all_unnamed == true, |
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"unnamed modules can always read all unnamed modules"); |
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return _can_read_all_unnamed; |
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} |
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// Modules can only go from strict to loose. |
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void set_can_read_all_unnamed() { _can_read_all_unnamed = true; } |
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bool has_default_read_edges() const { |
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return _has_default_read_edges; |
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} |
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// Sets true and returns the previous value. |
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bool set_has_default_read_edges() { |
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MutexLocker ml(Module_lock); |
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bool prev = _has_default_read_edges; |
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_has_default_read_edges = true; |
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return prev; |
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} |
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ModuleEntry* next() const { |
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return (ModuleEntry*)HashtableEntry<Symbol*, mtModule>::next(); |
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} |
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ModuleEntry** next_addr() { |
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return (ModuleEntry**)HashtableEntry<Symbol*, mtModule>::next_addr(); |
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} |
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// iteration support for readability |
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void module_reads_do(ModuleClosure* const f); |
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TRACE_DEFINE_TRACE_ID_METHODS; |
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// Purge dead weak references out of reads list when any given class loader is unloaded. |
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void purge_reads(); |
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void delete_reads(); |
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void print(outputStream* st = tty); |
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void verify(); |
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}; |
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// Iterator interface |
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class ModuleClosure: public StackObj { |
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public: |
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virtual void do_module(ModuleEntry* const module) = 0; |
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}; |
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// The ModuleEntryTable is a Hashtable containing a list of all modules defined |
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// by a particular class loader. Each module is represented as a ModuleEntry node. |
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// |
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// Each ModuleEntryTable contains a _javabase_module field which allows for the |
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// creation of java.base's ModuleEntry very early in bootstrapping before the |
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// corresponding JVM_DefineModule call for java.base occurs during module system |
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// initialization. Setting up java.base's ModuleEntry early enables classes, |
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// loaded prior to the module system being initialized to be created with their |
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// PackageEntry node's correctly pointing at java.base's ModuleEntry. No class |
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// outside of java.base is allowed to be loaded pre-module system initialization. |
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// |
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// The ModuleEntryTable's lookup is lock free. |
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// |
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class ModuleEntryTable : public Hashtable<Symbol*, mtModule> { |
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friend class VMStructs; |
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public: |
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enum Constants { |
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_moduletable_entry_size = 109 // number of entries in module entry table |
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}; |
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private: |
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static ModuleEntry* _javabase_module; |
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ModuleEntry* _unnamed_module; |
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ModuleEntry* new_entry(unsigned int hash, Handle module_handle, Symbol* name, Symbol* version, |
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Symbol* location, ClassLoaderData* loader_data); |
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void add_entry(int index, ModuleEntry* new_entry); |
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int entry_size() const { return BasicHashtable<mtModule>::entry_size(); } |
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ModuleEntry** bucket_addr(int i) { |
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return (ModuleEntry**)Hashtable<Symbol*, mtModule>::bucket_addr(i); |
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} |
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static unsigned int compute_hash(Symbol* name) { return ((name == NULL) ? 0 : (unsigned int)(name->identity_hash())); } |
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int index_for(Symbol* name) const { return hash_to_index(compute_hash(name)); } |
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public: |
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ModuleEntryTable(int table_size); |
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~ModuleEntryTable(); |
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ModuleEntry* bucket(int i) { |
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return (ModuleEntry*)Hashtable<Symbol*, mtModule>::bucket(i); |
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} |
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// Create module in loader's module entry table, if already exists then |
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// return null. Assume Module_lock has been locked by caller. |
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ModuleEntry* locked_create_entry_or_null(Handle module_handle, |
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Symbol* module_name, |
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Symbol* module_version, |
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Symbol* module_location, |
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ClassLoaderData* loader_data); |
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// Only lookup module within loader's module entry table. The table read is lock-free. |
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ModuleEntry* lookup_only(Symbol* name); |
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// purge dead weak references out of reads list |
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void purge_all_module_reads(); |
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// Special handling for unnamed module, one per class loader's ModuleEntryTable |
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void create_unnamed_module(ClassLoaderData* loader_data); |
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ModuleEntry* unnamed_module() { return _unnamed_module; } |
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// Special handling for java.base |
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static ModuleEntry* javabase_module() { return _javabase_module; } |
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static void set_javabase_module(ModuleEntry* java_base) { _javabase_module = java_base; } |
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static bool javabase_defined() { return ((_javabase_module != NULL) && |
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(_javabase_module->module() != NULL)); } |
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static void finalize_javabase(Handle module_handle, Symbol* version, Symbol* location); |
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static void patch_javabase_entries(Handle module_handle); |
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void print(outputStream* st = tty); |
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void verify(); |
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}; |
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#endif // SHARE_VM_CLASSFILE_MODULEENTRY_HPP |