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/*
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* Copyright (c) 2019, 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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#include "precompiled.hpp"
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#include "classfile/classLoaderData.hpp"
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#include "gc/z/zAddress.hpp"
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#include "gc/z/zHeap.inline.hpp"
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#include "gc/z/zOop.hpp"
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#include "gc/z/zResurrection.hpp"
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#include "gc/z/zRootsIterator.hpp"
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#include "gc/z/zStat.hpp"
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#include "gc/z/zVerify.hpp"
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#include "memory/iterator.inline.hpp"
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#include "oops/oop.hpp"
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#define BAD_OOP_ARG(o, p) "Bad oop " PTR_FORMAT " found at " PTR_FORMAT, p2i(o), p2i(p)
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static void verify_oop(oop* p) {
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const oop o = RawAccess<>::oop_load(p);
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if (o != NULL) {
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const uintptr_t addr = ZOop::to_address(o);
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guarantee(ZAddress::is_good(addr), BAD_OOP_ARG(o, p));
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guarantee(oopDesc::is_oop(ZOop::from_address(addr)), BAD_OOP_ARG(o, p));
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}
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}
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static void verify_possibly_weak_oop(oop* p) {
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const oop o = RawAccess<>::oop_load(p);
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if (o != NULL) {
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const uintptr_t addr = ZOop::to_address(o);
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guarantee(ZAddress::is_good(addr) || ZAddress::is_finalizable_good(addr), BAD_OOP_ARG(o, p));
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guarantee(oopDesc::is_oop(ZOop::from_address(ZAddress::good(addr))), BAD_OOP_ARG(o, p));
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}
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}
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class ZVerifyRootClosure : public ZRootsIteratorClosure {
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public:
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virtual void do_oop(oop* p) {
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verify_oop(p);
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}
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virtual void do_oop(narrowOop*) {
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ShouldNotReachHere();
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}
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};
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class ZVerifyOopClosure : public ClaimMetadataVisitingOopIterateClosure, public ZRootsIteratorClosure {
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private:
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const bool _verify_weaks;
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public:
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ZVerifyOopClosure(bool verify_weaks) :
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ClaimMetadataVisitingOopIterateClosure(ClassLoaderData::_claim_other),
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_verify_weaks(verify_weaks) {}
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virtual void do_oop(oop* p) {
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if (_verify_weaks) {
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verify_possibly_weak_oop(p);
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} else {
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// We should never encounter finalizable oops through strong
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// paths. This assumes we have only visited strong roots.
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verify_oop(p);
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}
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}
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virtual void do_oop(narrowOop* p) {
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ShouldNotReachHere();
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}
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virtual ReferenceIterationMode reference_iteration_mode() {
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return _verify_weaks ? DO_FIELDS : DO_FIELDS_EXCEPT_REFERENT;
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}
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#ifdef ASSERT
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// Verification handled by the closure itself
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virtual bool should_verify_oops() {
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return false;
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}
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#endif
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};
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template <typename RootsIterator>
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void ZVerify::roots() {
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assert(SafepointSynchronize::is_at_safepoint(), "Must be at a safepoint");
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assert(!ZResurrection::is_blocked(), "Invalid phase");
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if (ZVerifyRoots) {
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ZVerifyRootClosure cl;
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RootsIterator iter;
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iter.oops_do(&cl);
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}
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}
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void ZVerify::roots_strong() {
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roots<ZRootsIterator>();
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}
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void ZVerify::roots_weak() {
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roots<ZWeakRootsIterator>();
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}
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void ZVerify::roots_concurrent_strong() {
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roots<ZConcurrentRootsIteratorClaimNone>();
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}
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void ZVerify::roots_concurrent_weak() {
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roots<ZConcurrentWeakRootsIterator>();
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}
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void ZVerify::roots(bool verify_weaks) {
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roots_strong();
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roots_concurrent_strong();
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if (verify_weaks) {
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roots_weak();
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roots_concurrent_weak();
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}
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}
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void ZVerify::objects(bool verify_weaks) {
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assert(SafepointSynchronize::is_at_safepoint(), "Must be at a safepoint");
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assert(ZGlobalPhase == ZPhaseMarkCompleted, "Invalid phase");
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assert(!ZResurrection::is_blocked(), "Invalid phase");
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if (ZVerifyObjects) {
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ZVerifyOopClosure cl(verify_weaks);
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ObjectToOopClosure object_cl(&cl);
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ZHeap::heap()->object_iterate(&object_cl, verify_weaks);
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}
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}
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void ZVerify::roots_and_objects(bool verify_weaks) {
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roots(verify_weaks);
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objects(verify_weaks);
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}
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void ZVerify::before_zoperation() {
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// Verify strong roots
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ZStatTimerDisable disable;
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roots_strong();
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}
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void ZVerify::after_mark() {
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// Verify all strong roots and strong references
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ZStatTimerDisable disable;
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roots_and_objects(false /* verify_weaks */);
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}
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void ZVerify::after_weak_processing() {
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// Verify all roots and all references
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ZStatTimerDisable disable;
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roots_and_objects(true /* verify_weaks */);
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}
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