hotspot/src/share/vm/memory/metaspaceClosure.cpp
author iklam
Wed, 02 Aug 2017 18:06:38 -0700
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8072061: Automatically determine optimal sizes for the CDS regions Summary: See new C++ class MetaspaceClosure. Reviewed-by: coleenp, jiangli, mseledtsov
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/*
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 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "memory/metaspaceClosure.hpp"
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// Update the reference to point to new_loc.
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void MetaspaceClosure::Ref::update(address new_loc) const {
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  log_trace(cds)("Ref: [" PTR_FORMAT "] -> " PTR_FORMAT " => " PTR_FORMAT,
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                 p2i(mpp()), p2i(obj()), p2i(new_loc));
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  uintx p = (uintx)new_loc;
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  p |= flag_bits(); // Make sure the flag bits are copied to the new pointer.
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  *(address*)mpp() = (address)p;
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}
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void MetaspaceClosure::push_impl(MetaspaceClosure::Ref* ref, Writability w) {
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  if (ref->not_null()) {
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    bool read_only;
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    switch (w) {
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    case _writable:
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      read_only = false;
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      break;
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    case _not_writable:
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      read_only = true;
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      break;
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    default:
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      assert(w == _default, "must be");
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      read_only = ref->is_read_only_by_default();
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    }
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    if (do_ref(ref, read_only)) { // true means we want to iterate the embedded pointer in <ref>
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      ref->metaspace_pointers_do(this);
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    }
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  }
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}
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bool UniqueMetaspaceClosure::do_ref(MetaspaceClosure::Ref* ref, bool read_only) {
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  bool* found = _has_been_visited.get(ref->obj());
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  if (found != NULL) {
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    assert(*found == read_only, "must be");
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    return false; // Already visited: no need to iterate embedded pointers.
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  } else {
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    bool isnew = _has_been_visited.put(ref->obj(), read_only);
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    assert(isnew, "sanity");
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    do_unique_ref(ref, read_only);
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    return true;  // Saw this for the first time: iterate the embedded pointers.
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  }
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}