Mercurial > hg > truffle
view src/share/vm/gc_implementation/g1/bufferingOopClosure.hpp @ 19177:1a7b33c96c0d
Fixes for TruffleGraphBuilderPluginsProvider.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Fri, 06 Feb 2015 16:49:34 +0100 |
parents | 52b4284cb496 |
children | 7848fc12602b |
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/* * Copyright (c) 2001, 2010, 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_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP #define SHARE_VM_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP #include "memory/genOopClosures.hpp" #include "memory/generation.hpp" #include "runtime/os.hpp" #include "utilities/taskqueue.hpp" // A BufferingOops closure tries to separate out the cost of finding roots // from the cost of applying closures to them. It maintains an array of // ref-containing locations. Until the array is full, applying the closure // to an oop* merely records that location in the array. Since this // closure app cost is small, an elapsed timer can approximately attribute // all of this cost to the cost of finding the roots. When the array fills // up, the wrapped closure is applied to all elements, keeping track of // this elapsed time of this process, and leaving the array empty. // The caller must be sure to call "done" to process any unprocessed // buffered entriess. class Generation; class HeapRegion; class BufferingOopClosure: public OopClosure { protected: enum PrivateConstants { BufferLength = 1024 }; StarTask _buffer[BufferLength]; StarTask* _buffer_top; StarTask* _buffer_curr; OopClosure* _oc; double _closure_app_seconds; void process_buffer () { double start = os::elapsedTime(); for (StarTask* curr = _buffer; curr < _buffer_curr; ++curr) { if (curr->is_narrow()) { assert(UseCompressedOops, "Error"); _oc->do_oop((narrowOop*)(*curr)); } else { _oc->do_oop((oop*)(*curr)); } } _buffer_curr = _buffer; _closure_app_seconds += (os::elapsedTime() - start); } template <class T> inline void do_oop_work(T* p) { if (_buffer_curr == _buffer_top) { process_buffer(); } StarTask new_ref(p); *_buffer_curr = new_ref; ++_buffer_curr; } public: virtual void do_oop(narrowOop* p) { do_oop_work(p); } virtual void do_oop(oop* p) { do_oop_work(p); } void done () { if (_buffer_curr > _buffer) { process_buffer(); } } double closure_app_seconds () { return _closure_app_seconds; } BufferingOopClosure (OopClosure *oc) : _oc(oc), _buffer_curr(_buffer), _buffer_top(_buffer + BufferLength), _closure_app_seconds(0.0) { } }; #endif // SHARE_VM_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP