author | zgu |
Fri, 18 Oct 2019 11:36:35 -0400 | |
changeset 58686 | 0279391875bf |
parent 55463 | 31bf7b93df5d |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2018, 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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package jdk.vm.ci.hotspot; |
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import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.runtime; |
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import java.io.ByteArrayOutputStream; |
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import java.io.PrintStream; |
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import jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.Option; |
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import jdk.vm.ci.meta.JavaConstant; |
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/** |
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* Encapsulates a JNI reference to an object in the HotSpot heap. |
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* |
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* {@link IndirectHotSpotObjectConstantImpl} objects are only allocated in the shared library heap. |
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* |
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* @see HotSpotObjectConstantScope |
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*/ |
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final class IndirectHotSpotObjectConstantImpl extends HotSpotObjectConstantImpl { |
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/** |
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* An object handle in {@code JVMCI::_object_handles}. |
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*/ |
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private long objectHandle; |
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/** |
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* Lazily computed hash code. |
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*/ |
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private int hashCode; |
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final IndirectHotSpotObjectConstantImpl base; |
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private static class Audit { |
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final Object scope; |
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final long handle; |
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final Throwable origin; |
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Audit(Object scope, long handle, Throwable origin) { |
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this.scope = scope; |
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this.handle = handle; |
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this.origin = origin; |
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} |
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} |
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/** |
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* Details useful to audit a scoped handle used after its creating scope closes. Set to an |
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* {@link Audit} object if {@link HotSpotJVMCIRuntime.Option#AuditHandles} is true otherwise to |
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* {@link HotSpotObjectConstantScope#localScopeDescription}. |
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*/ |
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private Object rawAudit; |
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@SuppressWarnings("serial") |
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@VMEntryPoint |
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private IndirectHotSpotObjectConstantImpl(long objectHandle, boolean compressed, boolean skipRegister) { |
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super(compressed); |
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assert objectHandle != 0 && UnsafeAccess.UNSAFE.getLong(objectHandle) != 0; |
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this.objectHandle = objectHandle; |
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this.base = null; |
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if (!skipRegister) { |
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HotSpotObjectConstantScope scope = HotSpotObjectConstantScope.CURRENT.get(); |
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if (scope != null && !scope.isGlobal()) { |
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scope.add(this); |
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if (HotSpotJVMCIRuntime.Option.AuditHandles.getBoolean()) { |
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rawAudit = new Audit(scope.localScopeDescription, objectHandle, new Throwable() { |
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@Override |
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public String toString() { |
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return "Created " + objectHandle; |
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} |
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}); |
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} |
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} else { |
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HandleCleaner.create(this, objectHandle); |
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} |
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} |
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} |
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private IndirectHotSpotObjectConstantImpl(IndirectHotSpotObjectConstantImpl base, boolean compressed) { |
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super(compressed); |
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// This is a variant of an original object that only varies in compress vs uncompressed. |
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// Instead of creating a new handle, reference that object and objectHandle. |
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this.objectHandle = base.getHandle(); |
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// There should only be one level of indirection to the base object. |
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assert base.base == null || base.base.base == null; |
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this.base = base.base != null ? base.base : base; |
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} |
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long getHandle() { |
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checkHandle(); |
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return objectHandle; |
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} |
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private void checkHandle() { |
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if (objectHandle == 0L) { |
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String message; |
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if (rawAudit instanceof Audit) { |
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Audit audit = (Audit) rawAudit; |
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ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
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PrintStream ps = new PrintStream(baos); |
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ps.println("Foreign object reference " + audit.handle + " created in scope '" + audit.scope + "' is no longer valid. Origin: {"); |
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audit.origin.printStackTrace(ps); |
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ps.print('}'); |
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ps.flush(); |
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message = baos.toString(); |
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} else { |
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message = "Foreign object reference created in scope '" + rawAudit + "' is no longer valid. " + |
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"Set property " + Option.AuditHandles.getPropertyName() + "=true to show origin of invalid foreign references."; |
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} |
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throw new NullPointerException(message); |
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} |
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} |
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boolean isValid() { |
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return objectHandle != 0L; |
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} |
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@Override |
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public HotSpotResolvedObjectType getType() { |
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checkHandle(); |
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return super.getType(); |
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} |
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/** |
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* Clears the foreign object reference. |
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*/ |
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void clear(Object scopeDescription) { |
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checkHandle(); |
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CompilerToVM.compilerToVM().deleteGlobalHandle(objectHandle); |
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if (rawAudit == null) { |
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rawAudit = scopeDescription; |
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} |
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objectHandle = 0L; |
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} |
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@Override |
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public JavaConstant compress() { |
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assert !compressed; |
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return new IndirectHotSpotObjectConstantImpl(this, true); |
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} |
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@Override |
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public JavaConstant uncompress() { |
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assert compressed; |
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return new IndirectHotSpotObjectConstantImpl(this, false); |
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} |
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@Override |
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public int getIdentityHashCode() { |
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checkHandle(); |
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int hash = hashCode; |
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if (hash == 0) { |
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hash = runtime().compilerToVm.getIdentityHashCode(this); |
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if (hash == 0) { |
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hash = 31; |
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} |
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hashCode = hash; |
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} |
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return hash; |
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} |
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} |