/
shenandoahCodeRoots.hpp
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/
shenandoahCodeRoots.hpp
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/*
* Copyright (c) 2017, 2020, Red Hat, Inc. 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_GC_SHENANDOAH_SHENANDOAHCODEROOTS_HPP
#define SHARE_GC_SHENANDOAH_SHENANDOAHCODEROOTS_HPP
#include "code/codeCache.hpp"
#include "gc/shenandoah/shenandoahSharedVariables.hpp"
#include "gc/shenandoah/shenandoahLock.hpp"
#include "gc/shenandoah/shenandoahNMethod.hpp"
#include "memory/allocation.hpp"
#include "memory/iterator.hpp"
#include "utilities/globalDefinitions.hpp"
class ShenandoahHeap;
class ShenandoahHeapRegion;
class ShenandoahParallelCodeHeapIterator {
friend class CodeCache;
private:
CodeHeap* _heap;
DEFINE_PAD_MINUS_SIZE(0, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile int));
volatile int _claimed_idx;
volatile bool _finished;
DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, 0);
public:
ShenandoahParallelCodeHeapIterator(CodeHeap* heap);
void parallel_blobs_do(CodeBlobClosure* f);
};
class ShenandoahParallelCodeCacheIterator {
friend class CodeCache;
private:
ShenandoahParallelCodeHeapIterator* _iters;
int _length;
NONCOPYABLE(ShenandoahParallelCodeCacheIterator);
public:
ShenandoahParallelCodeCacheIterator(const GrowableArray<CodeHeap*>* heaps);
~ShenandoahParallelCodeCacheIterator();
void parallel_blobs_do(CodeBlobClosure* f);
};
class ShenandoahCodeRootsIterator {
friend class ShenandoahCodeRoots;
protected:
ShenandoahParallelCodeCacheIterator _par_iterator;
ShenandoahSharedFlag _seq_claimed;
ShenandoahNMethodTableSnapshot* _table_snapshot;
protected:
ShenandoahCodeRootsIterator();
~ShenandoahCodeRootsIterator();
template<bool CSET_FILTER>
void dispatch_parallel_blobs_do(CodeBlobClosure *f);
template<bool CSET_FILTER>
void fast_parallel_blobs_do(CodeBlobClosure *f);
};
class ShenandoahAllCodeRootsIterator : public ShenandoahCodeRootsIterator {
public:
ShenandoahAllCodeRootsIterator() : ShenandoahCodeRootsIterator() {};
void possibly_parallel_blobs_do(CodeBlobClosure *f);
};
class ShenandoahCsetCodeRootsIterator : public ShenandoahCodeRootsIterator {
public:
ShenandoahCsetCodeRootsIterator() : ShenandoahCodeRootsIterator() {};
void possibly_parallel_blobs_do(CodeBlobClosure* f);
};
class ShenandoahCodeRoots : public AllStatic {
friend class ShenandoahHeap;
friend class ShenandoahCodeRootsIterator;
public:
static void initialize();
static void register_nmethod(nmethod* nm);
static void unregister_nmethod(nmethod* nm);
static void flush_nmethod(nmethod* nm);
static ShenandoahNMethodTable* table() {
return _nmethod_table;
}
// Concurrent nmethod unloading support
static void unlink(WorkGang* workers, bool unloading_occurred);
static void purge(WorkGang* workers);
static void arm_nmethods();
static void disarm_nmethods();
static int disarmed_value() { return _disarmed_value; }
static int* disarmed_value_address() { return &_disarmed_value; }
private:
static ShenandoahNMethodTable* _nmethod_table;
static int _disarmed_value;
};
#endif // SHARE_GC_SHENANDOAH_SHENANDOAHCODEROOTS_HPP