Mercurial > hg > graal-jvmci-8
view jvmci/jdk.vm.ci.code/src/jdk/vm/ci/code/VirtualObject.java @ 23712:66059526b021 jvmci-0.16
8160177: [JVMCI] race condition in HotSpotMemoryAccessProviderImpl.verifyReadRawObject
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Thu, 23 Jun 2016 16:49:32 +0200 |
parents | 9e1235406b59 |
children |
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/* * Copyright (c) 2010, 2015, 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. */ package jdk.vm.ci.code; import java.util.Arrays; import java.util.Collections; import java.util.IdentityHashMap; import java.util.Set; import jdk.vm.ci.meta.JavaKind; import jdk.vm.ci.meta.JavaValue; import jdk.vm.ci.meta.ResolvedJavaField; import jdk.vm.ci.meta.ResolvedJavaType; /** * An instance of this class represents an object whose allocation was removed by escape analysis. * The information stored in the {@link VirtualObject} is used during deoptimization to recreate the * object. */ public final class VirtualObject implements JavaValue { private final ResolvedJavaType type; private JavaValue[] values; private JavaKind[] slotKinds; private final int id; /** * Creates a new {@link VirtualObject} for the given type, with the given fields. If * {@code type} is an instance class then {@code values} provides the values for the fields * returned by {@link ResolvedJavaType#getInstanceFields(boolean) getInstanceFields(true)}. If * {@code type} is an array then the length of the values array determines the reallocated array * length. * * @param type the type of the object whose allocation was removed during compilation. This can * be either an instance of an array type. * @param id a unique id that identifies the object within the debug information for one * position in the compiled code. * @return a new {@link VirtualObject} instance. */ public static VirtualObject get(ResolvedJavaType type, int id) { return new VirtualObject(type, id); } private VirtualObject(ResolvedJavaType type, int id) { this.type = type; this.id = id; } private static StringBuilder appendValue(StringBuilder buf, JavaValue value, Set<VirtualObject> visited) { if (value instanceof VirtualObject) { VirtualObject vo = (VirtualObject) value; buf.append("vobject:").append(vo.type.toJavaName(false)).append(':').append(vo.id); if (!visited.contains(vo)) { visited.add(vo); buf.append('{'); if (vo.values == null) { buf.append("<uninitialized>"); } else { if (vo.type.isArray()) { for (int i = 0; i < vo.values.length; i++) { if (i != 0) { buf.append(','); } buf.append(i).append('='); appendValue(buf, vo.values[i], visited); } } else { ResolvedJavaField[] fields = vo.type.getInstanceFields(true); assert fields.length == vo.values.length : vo.type + ", fields=" + Arrays.toString(fields) + ", values=" + Arrays.toString(vo.values); for (int i = 0; i < vo.values.length; i++) { if (i != 0) { buf.append(','); } buf.append(fields[i].getName()).append('='); appendValue(buf, vo.values[i], visited); } } } buf.append('}'); } } else { buf.append(value); } return buf; } @Override public String toString() { Set<VirtualObject> visited = Collections.newSetFromMap(new IdentityHashMap<VirtualObject, Boolean>()); return appendValue(new StringBuilder(), this, visited).toString(); } /** * Returns the type of the object whose allocation was removed during compilation. This can be * either an instance of an array type. */ public ResolvedJavaType getType() { return type; } /** * Returns the array containing all the values to be stored into the object when it is * recreated. This field is intentional exposed as a mutable array that a compiler may modify * (e.g. during register allocation). */ @SuppressFBWarnings(value = "EI_EXPOSE_REP", justification = "`values` is intentional mutable")// public JavaValue[] getValues() { return values; } /** * Returns the kind of the value at {@code index}. */ public JavaKind getSlotKind(int index) { return slotKinds[index]; } /** * Returns the unique id that identifies the object within the debug information for one * position in the compiled code. */ public int getId() { return id; } /** * Overwrites the current set of values with a new one. * * @param values an array containing all the values to be stored into the object when it is * recreated. * @param slotKinds an array containing the Java kinds of the values. This must have the same * length as {@code values}. This array is now owned by this object and must not be * mutated by the caller. */ @SuppressFBWarnings(value = "EI_EXPOSE_REP2", justification = "caller transfers ownership of `slotKinds`") public void setValues(JavaValue[] values, JavaKind[] slotKinds) { assert values.length == slotKinds.length; this.values = values; this.slotKinds = slotKinds; } @Override public int hashCode() { return 42 + type.hashCode(); } @Override public boolean equals(Object o) { if (o == this) { return true; } if (o instanceof VirtualObject) { VirtualObject l = (VirtualObject) o; if (!l.type.equals(type) || l.values.length != values.length) { return false; } for (int i = 0; i < values.length; i++) { /* * Virtual objects can form cycles. Calling equals() could therefore lead to * infinite recursion. */ if (!same(values[i], l.values[i])) { return false; } } return true; } return false; } private static boolean same(Object o1, Object o2) { return o1 == o2; } }