| Quellcodebibliothek Statistik Leitseite products/Sources/formale Sprachen/Java/Openjdk/src/hotspot/share/cds/ (Sun/Oracle ©) Datei vom 13.11.2022 mit Größe 3 kB |
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Quelle classPrelinker.hpp Sprache: C |
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/*
* Copyright (c) 2022, 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_CDS_CLASSPRELINKER_HPP #define SHARE_CDS_CLASSPRELINKER_HPP #include "oops/oopsHierarchy.hpp" #include "memory/allStatic.hpp" #include "memory/allocation.hpp" #include "runtime/handles.hpp" #include "utilities/exceptions.hpp" #include "utilities/macros.hpp" #include "utilities/resourceHash.hpp" class ConstantPool; class constantPoolHandle; class InstanceKlass; class Klass; // ClassPrelinker is used to perform ahead-of-time linking of ConstantPool entries // for archived InstanceKlasses. // // At run time, Java classes are loaded dynamically and may be replaced with JVMTI. // Therefore, we take care to prelink only the ConstantPool entries that are // guatanteed to resolve to the same results at both dump time and run time. // // For example, a JVM_CONSTANT_Class reference to a supertype can be safely resolved // at dump time, because at run time we will load a class from the CDS archive only // if all of its supertypes are loaded from the CDS archive. class ClassPrelinker : AllStatic { using ClassesTable = ResourceHashtable<InstanceKlass*, bool, 15889, AnyObj::C_HEAP, mtCl static ClassesTable* _processed_classes; static ClassesTable* _vm_classes; static void add_one_vm_class(InstanceKlass* ik); #ifdef ASSERT static bool is_in_archivebuilder_buffer(address p); #endif template <typename T> static bool is_in_archivebuilder_buffer(T p) { return is_in_archivebuilder_buffer((address)(p)); } static void resolve_string(constantPoolHandle cp, int cp_index, TRAPS) NOT_CDS_JAVA_HEA static Klass* maybe_resolve_class(constantPoolHandle cp, int cp_index, TRAPS); static bool can_archive_resolved_klass(InstanceKlass* cp_holder, Klass* resolved_klas static Klass* find_loaded_class(JavaThread* THREAD, oop class_loader, Symbol* name); public: static void initialize(); static void dispose(); // Is this class resolved as part of vmClasses::resolve_all()? If so, these // classes are guatanteed to be loaded at runtime (and cannot be replaced by JVMTI) // when CDS is enabled. Therefore, we can safely keep a direct reference to these // classes. static bool is_vm_class(InstanceKlass* ik); // Resolve all constant pool entries that are safe to be stored in the // CDS archive. static void dumptime_resolve_constants(InstanceKlass* ik, TRAPS); // Can we resolve the klass entry at cp_index in this constant pool, and store // the result in the CDS archive? Returns true if cp_index is guaranteed to // resolve to the same InstanceKlass* at both dump time and run time. static bool can_archive_resolved_klass(ConstantPool* cp, int cp_index); }; #endif // SHARE_CDS_CLASSPRELINKER_HPP ¤ Dauer der Verarbeitung: 0.14 Sekunden (vorverarbeitet) ¤*© Formatika GbR, Deutschland |
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2026-03-28