Mercurial > hg > truffle
diff src/share/vm/oops/metadata.hpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author | coleenp |
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date | Sat, 01 Sep 2012 13:25:18 -0400 |
parents | |
children | cd6b3f1a94ff |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/oops/metadata.hpp Sat Sep 01 13:25:18 2012 -0400 @@ -0,0 +1,85 @@ +/* + * Copyright (c) 2011, 2012, 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_OOPS_METADATA_HPP +#define SHARE_VM_OOPS_METADATA_HPP + +#include "utilities/exceptions.hpp" +#include "utilities/globalDefinitions.hpp" +#include "utilities/ostream.hpp" + +// This is the base class for an internal Class related metadata +class Metadata : public MetaspaceObj { + // Debugging hook to check that the metadata has not been deleted. + NOT_PRODUCT(int _valid;) + public: + NOT_PRODUCT(Metadata() { _valid = 0; }) + NOT_PRODUCT(bool is_valid() const volatile { return _valid == 0; }) + + int identity_hash() { return (int)(uintptr_t)this; } + + // Rehashing support for tables containing pointers to this + unsigned int new_hash(jint seed) { ShouldNotReachHere(); return 0; } + + virtual bool is_klass() const volatile { return false; } + virtual bool is_method() const volatile { return false; } + virtual bool is_methodData() const volatile { return false; } + virtual bool is_constantPool() const volatile { return false; } + + virtual const char* internal_name() const = 0; + + void print() const { print_on(tty); } + void print_value() const { print_value_on(tty); } + + void print_maybe_null() const { print_on_maybe_null(tty); } + void print_on_maybe_null(outputStream* st) const { + if (this == NULL) + st->print("NULL"); + else + print_on(tty); + } + void print_value_on_maybe_null(outputStream* st) const { + if (this == NULL) + st->print("NULL"); + else + print_value_on(tty); + } + + virtual void print_on(outputStream* st) const; // First level print + virtual void print_value_on(outputStream* st) const = 0; // Second level print + + char* print_value_string() const; + + // Used to keep metadata alive during class redefinition + // Can't assert because is called for delete functions (as an assert) + virtual bool on_stack() const { return false; } + virtual void set_on_stack(const bool value); + + // Set on_stack bit, so that the metadata is not cleared + // during class redefinition. This is a virtual call because only methods + // and constant pools need to be set, but someday instanceKlasses might also. + static void mark_on_stack(Metadata* m) { m->set_on_stack(true); } +}; + +#endif // SHARE_VM_OOPS_METADATA_HPP