Mercurial > hg > graal-compiler
view src/share/vm/classfile/metadataOnStackMark.cpp @ 12456:f87c68d79f07
improved support for co-existing, multiple backends (GRAAL-363)
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 17 Oct 2013 01:08:17 +0200 |
parents | 5daaddd917a1 |
children | 910026b800b8 |
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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. * */ #include "precompiled.hpp" #include "classfile/metadataOnStackMark.hpp" #include "code/codeCache.hpp" #include "compiler/compileBroker.hpp" #include "oops/metadata.hpp" #include "runtime/synchronizer.hpp" #include "runtime/thread.hpp" #include "utilities/growableArray.hpp" // Keep track of marked on-stack metadata so it can be cleared. GrowableArray<Metadata*>* _marked_objects = NULL; NOT_PRODUCT(bool MetadataOnStackMark::_is_active = false;) // Walk metadata on the stack and mark it so that redefinition doesn't delete // it. Class unloading also walks the previous versions and might try to // delete it, so this class is used by class unloading also. MetadataOnStackMark::MetadataOnStackMark() { assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); NOT_PRODUCT(_is_active = true;) if (_marked_objects == NULL) { _marked_objects = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(1000, true); } Threads::metadata_do(Metadata::mark_on_stack); CodeCache::alive_nmethods_do(nmethod::mark_on_stack); CompileBroker::mark_on_stack(); } MetadataOnStackMark::~MetadataOnStackMark() { assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); // Unmark everything that was marked. Can't do the same walk because // redefine classes messes up the code cache so the set of methods // might not be the same. for (int i = 0; i< _marked_objects->length(); i++) { _marked_objects->at(i)->set_on_stack(false); } _marked_objects->clear(); // reuse growable array for next time. NOT_PRODUCT(_is_active = false;) } // Record which objects are marked so we can unmark the same objects. void MetadataOnStackMark::record(Metadata* m) { assert(_is_active, "metadata on stack marking is active"); _marked_objects->push(m); }