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8006040: NPG: on_stack processing wastes space in ConstantPool

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Added on_stack bit to flags.  Also MetadataMarkOnStack is used for more than JVMTI so had to be moved.

Reviewed-by: dholmes, stefank
This commit is contained in:
Coleen Phillimore 2013-01-23 10:34:29 -05:00
parent 4d81507a36
commit 99039568f9
9 changed files with 152 additions and 96 deletions
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45
hotspot/src/share/vm/classfile/metadataOnStackMark.hpp Normal file
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/*
* Copyright (c) 2013, 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_METADATAONSTACKMARK_HPP
#define SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP
#include "memory/allocation.hpp"
class Metadata;
// Helper class to mark and unmark metadata used on the stack as either handles
// or executing methods, so that it can't be deleted during class redefinition
// and class unloading.
// This is also used for other things that can be deallocated, like class
// metadata during parsing, relocated methods, and methods in backtraces.
class MetadataOnStackMark : public StackObj {
NOT_PRODUCT(static bool _is_active;)
public:
MetadataOnStackMark();
~MetadataOnStackMark();
static void record(Metadata* m);
};
#endif // SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP