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/*
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* Copyright (c) 2014, 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 org.graalvm.compiler.hotspot.nodes.type;
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import java.util.Objects;
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import org.graalvm.compiler.core.common.CompressEncoding;
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import org.graalvm.compiler.core.common.LIRKind;
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import org.graalvm.compiler.core.common.spi.LIRKindTool;
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import org.graalvm.compiler.core.common.type.AbstractPointerStamp;
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import org.graalvm.compiler.core.common.type.Stamp;
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import jdk.vm.ci.hotspot.HotSpotCompressedNullConstant;
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import jdk.vm.ci.hotspot.HotSpotMemoryAccessProvider;
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import jdk.vm.ci.hotspot.HotSpotMetaspaceConstant;
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import jdk.vm.ci.meta.Constant;
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import jdk.vm.ci.meta.JavaConstant;
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import jdk.vm.ci.meta.MemoryAccessProvider;
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import jdk.vm.ci.meta.MetaAccessProvider;
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public final class KlassPointerStamp extends MetaspacePointerStamp {
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private static final KlassPointerStamp KLASS = new KlassPointerStamp(false, false);
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private static final KlassPointerStamp KLASS_NON_NULL = new KlassPointerStamp(true, false);
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private static final KlassPointerStamp KLASS_ALWAYS_NULL = new KlassPointerStamp(false, true);
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private final CompressEncoding encoding;
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public static KlassPointerStamp klass() {
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return KLASS;
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}
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public static KlassPointerStamp klassNonNull() {
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return KLASS_NON_NULL;
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}
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public static KlassPointerStamp klassAlwaysNull() {
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return KLASS_ALWAYS_NULL;
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}
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private KlassPointerStamp(boolean nonNull, boolean alwaysNull) {
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this(nonNull, alwaysNull, null);
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}
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private KlassPointerStamp(boolean nonNull, boolean alwaysNull, CompressEncoding encoding) {
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super(nonNull, alwaysNull);
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this.encoding = encoding;
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}
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@Override
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public void accept(Visitor v) {
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super.accept(v);
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v.visitLong(encoding.getBase());
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v.visitInt(encoding.getShift());
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}
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@Override
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protected AbstractPointerStamp copyWith(boolean newNonNull, boolean newAlwaysNull) {
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return new KlassPointerStamp(newNonNull, newAlwaysNull, encoding);
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}
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@Override
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public boolean isCompatible(Stamp otherStamp) {
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if (this == otherStamp) {
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return true;
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}
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if (otherStamp instanceof KlassPointerStamp) {
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KlassPointerStamp other = (KlassPointerStamp) otherStamp;
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return Objects.equals(this.encoding, other.encoding);
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}
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return false;
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}
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@Override
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public boolean isCompatible(Constant constant) {
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if (constant instanceof HotSpotMetaspaceConstant) {
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return ((HotSpotMetaspaceConstant) constant).asResolvedJavaType() != null;
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} else {
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return super.isCompatible(constant);
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}
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}
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@Override
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public Stamp constant(Constant c, MetaAccessProvider meta) {
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if (isCompressed()) {
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if (HotSpotCompressedNullConstant.COMPRESSED_NULL.equals(c)) {
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return new KlassPointerStamp(false, true, encoding);
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}
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} else {
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if (JavaConstant.NULL_POINTER.equals(c)) {
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return KLASS_ALWAYS_NULL;
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}
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}
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assert c instanceof HotSpotMetaspaceConstant;
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assert ((HotSpotMetaspaceConstant) c).isCompressed() == isCompressed();
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if (nonNull()) {
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return this;
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}
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if (isCompressed()) {
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return new KlassPointerStamp(true, false, encoding);
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} else {
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return KLASS_NON_NULL;
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}
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}
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@Override
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public JavaConstant nullConstant() {
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if (isCompressed()) {
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return HotSpotCompressedNullConstant.COMPRESSED_NULL;
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} else {
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return super.nullConstant();
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}
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}
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@Override
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public LIRKind getLIRKind(LIRKindTool tool) {
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if (isCompressed()) {
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return tool.getNarrowPointerKind();
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} else {
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return super.getLIRKind(tool);
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}
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}
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public boolean isCompressed() {
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return encoding != null;
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}
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public CompressEncoding getEncoding() {
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return encoding;
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}
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public KlassPointerStamp compressed(CompressEncoding newEncoding) {
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assert !isCompressed();
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return new KlassPointerStamp(nonNull(), alwaysNull(), newEncoding);
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}
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public KlassPointerStamp uncompressed() {
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assert isCompressed();
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return new KlassPointerStamp(nonNull(), alwaysNull());
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}
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@Override
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public Constant readConstant(MemoryAccessProvider provider, Constant base, long displacement) {
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HotSpotMemoryAccessProvider hsProvider = (HotSpotMemoryAccessProvider) provider;
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if (isCompressed()) {
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return hsProvider.readNarrowKlassPointerConstant(base, displacement);
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} else {
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return hsProvider.readKlassPointerConstant(base, displacement);
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}
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}
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@Override
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public int hashCode() {
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final int prime = 31;
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int result = super.hashCode();
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result = prime * result + ((encoding == null) ? 0 : encoding.hashCode());
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj) {
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return true;
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}
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if (!super.equals(obj)) {
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return false;
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}
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if (!(obj instanceof KlassPointerStamp)) {
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return false;
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}
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KlassPointerStamp other = (KlassPointerStamp) obj;
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return Objects.equals(this.encoding, other.encoding);
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}
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@Override
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public String toString() {
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StringBuilder ret = new StringBuilder("Klass*");
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appendString(ret);
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if (isCompressed()) {
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ret.append("(compressed ").append(encoding).append(")");
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}
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return ret.toString();
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}
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}
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