5c58d27aac
Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Co-authored-by: Stefan Karlsson <stefan.karlsson@oracle.com> Co-authored-by: Mikael Gerdin <mikael.gerdin@oracle.com> Co-authored-by: Tom Rodriguez <tom.rodriguez@oracle.com> Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
86 lines
3.2 KiB
C++
86 lines
3.2 KiB
C++
/*
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* Copyright (c) 2011, 2012, 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_OOPS_METADATA_HPP
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#define SHARE_VM_OOPS_METADATA_HPP
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#include "utilities/exceptions.hpp"
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#include "utilities/globalDefinitions.hpp"
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#include "utilities/ostream.hpp"
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// This is the base class for an internal Class related metadata
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class Metadata : public MetaspaceObj {
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// Debugging hook to check that the metadata has not been deleted.
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NOT_PRODUCT(int _valid;)
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public:
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NOT_PRODUCT(Metadata() { _valid = 0; })
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NOT_PRODUCT(bool is_valid() const volatile { return _valid == 0; })
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int identity_hash() { return (int)(uintptr_t)this; }
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// Rehashing support for tables containing pointers to this
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unsigned int new_hash(jint seed) { ShouldNotReachHere(); return 0; }
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virtual bool is_klass() const volatile { return false; }
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virtual bool is_method() const volatile { return false; }
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virtual bool is_methodData() const volatile { return false; }
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virtual bool is_constantPool() const volatile { return false; }
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virtual const char* internal_name() const = 0;
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void print() const { print_on(tty); }
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void print_value() const { print_value_on(tty); }
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void print_maybe_null() const { print_on_maybe_null(tty); }
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void print_on_maybe_null(outputStream* st) const {
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if (this == NULL)
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st->print("NULL");
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else
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print_on(tty);
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}
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void print_value_on_maybe_null(outputStream* st) const {
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if (this == NULL)
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st->print("NULL");
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else
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print_value_on(tty);
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}
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virtual void print_on(outputStream* st) const; // First level print
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virtual void print_value_on(outputStream* st) const = 0; // Second level print
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char* print_value_string() const;
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// Used to keep metadata alive during class redefinition
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// Can't assert because is called for delete functions (as an assert)
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virtual bool on_stack() const { return false; }
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virtual void set_on_stack(const bool value);
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// Set on_stack bit, so that the metadata is not cleared
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// during class redefinition. This is a virtual call because only methods
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// and constant pools need to be set, but someday instanceKlasses might also.
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static void mark_on_stack(Metadata* m) { m->set_on_stack(true); }
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};
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#endif // SHARE_VM_OOPS_METADATA_HPP
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