/*
* Copyright (c) 2019, 2019, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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
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*/
package com.oracle.svm.core.meta;
import com.oracle.svm.core.SubstrateUtil;
import com.oracle.svm.core.hub.DynamicHub;
import jdk.vm.ci.meta.Constant;
import jdk.vm.ci.meta.JavaConstant;
import jdk.vm.ci.meta.JavaKind;
import jdk.vm.ci.meta.MetaAccessProvider;
import jdk.vm.ci.meta.ResolvedJavaType;
import jdk.vm.ci.meta.VMConstant;
public abstract class SubstrateObjectConstant implements JavaConstant, CompressibleConstant, VMConstant {
public static JavaConstant forObject(Object object) {
return forObject(object, false);
}
public static JavaConstant forObject(Object object, boolean compressed) {
if (object == null) {
return compressed ? CompressedNullConstant.COMPRESSED_NULL : JavaConstant.NULL_POINTER;
}
return new DirectSubstrateObjectConstant(object, compressed);
}
public static JavaConstant forBoxedValue(JavaKind kind, Object value) {
if (kind == JavaKind.Object) {
return forObject(value);
}
return JavaConstant.forBoxedPrimitive(value);
}
public static Object asObject(Constant constant) {
if (JavaConstant.isNull(constant)) {
return null;
}
return ((DirectSubstrateObjectConstant) constant).getObject();
}
public static <T> T asObject(Class<T> type, JavaConstant constant) {
if (constant.isNonNull()) {
Object object = ((DirectSubstrateObjectConstant) constant).getObject();
if (type.isInstance(object)) {
return type.cast(object);
}
}
return null;
}
public static Object asObject(ResolvedJavaType type, JavaConstant constant) {
if (constant.isNonNull() && constant instanceof DirectSubstrateObjectConstant) {
Object object = ((DirectSubstrateObjectConstant) constant).getObject();
if (type.isInstance(constant)) {
return object;
}
}
return null;
}
public static boolean isCompressed(JavaConstant constant) {
return constant instanceof CompressibleConstant && ((CompressibleConstant) constant).isCompressed();
}
protected final boolean compressed;
protected SubstrateObjectConstant(boolean compressed) {
this.compressed = compressed;
}
@Override
public boolean isCompressed() {
return compressed;
}
@Override
public boolean isNull() {
return false;
}
@Override
public boolean isDefaultForKind() {
return false;
}
@Override
public Object asBoxedPrimitive() {
throw new IllegalArgumentException();
}
@Override
public int asInt() {
throw new IllegalArgumentException();
}
@Override
public boolean asBoolean() {
throw new IllegalArgumentException();
}
@Override
public long asLong() {
throw new IllegalArgumentException();
}
@Override
public float asFloat() {
throw new IllegalArgumentException();
}
@Override
public double asDouble() {
throw new IllegalArgumentException();
}
@Override
public JavaKind getJavaKind() {
return JavaKind.Object;
}
@Override
public final boolean equals(Object obj) {
if (obj != this && obj instanceof SubstrateObjectConstant) {
SubstrateObjectConstant other = (SubstrateObjectConstant) obj;
return isCompressed() == other.isCompressed() && ObjectConstantEquality.get().test(this, other);
}
return obj == this;
}
@Override
public final int hashCode() {
return getIdentityHashCode();
}
public abstract int getIdentityHashCode();
public static int computeIdentityHashCode(Object object) {
if (SubstrateUtil.HOSTED && object instanceof DynamicHub) {
/*
* We need to use the identity hash code of the original java.lang.Class object and not
* of the DynamicHub, so that hash maps that are filled during image generation and use
* Class keys still work at run time.
*/
return System.identityHashCode(((DynamicHub) object).getHostedJavaClass());
} else {
return System.identityHashCode(object);
}
}
@Override
public String toString() {
return getJavaKind().getJavaName(); // + "[" + toValueString() + "]" + object;
}
public abstract ResolvedJavaType getType(MetaAccessProvider provider);
@Override
public abstract SubstrateObjectConstant compress();
@Override
public abstract SubstrateObjectConstant uncompress();
}