/*
* Copyright (c) 2015, 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
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*/
package org.graalvm.compiler.nodes.memory.address;
import org.graalvm.compiler.core.common.type.IntegerStamp;
import org.graalvm.compiler.core.common.type.Stamp;
import org.graalvm.compiler.graph.Node;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.graph.spi.Canonicalizable;
import org.graalvm.compiler.graph.spi.CanonicalizerTool;
import org.graalvm.compiler.nodeinfo.InputType;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.nodes.calc.AddNode;
import org.graalvm.compiler.nodes.calc.BinaryArithmeticNode;
import jdk.vm.ci.meta.JavaKind;
/**
* Represents an address that is composed of a base and an offset. The base can be either a
* {@link JavaKind#Object}, a word-sized integer or another pointer. The offset must be a word-sized
* integer.
*/
@NodeInfo(allowedUsageTypes = InputType.Association)
public class OffsetAddressNode extends AddressNode implements Canonicalizable {
public static final NodeClass<OffsetAddressNode> TYPE = NodeClass.create(OffsetAddressNode.class);
@Input ValueNode base;
@Input ValueNode offset;
public OffsetAddressNode(ValueNode base, ValueNode offset) {
super(TYPE);
this.base = base;
this.offset = offset;
}
@Override
public ValueNode getBase() {
return base;
}
public void setBase(ValueNode base) {
updateUsages(this.base, base);
this.base = base;
}
public ValueNode getOffset() {
return offset;
}
public void setOffset(ValueNode offset) {
updateUsages(this.offset, offset);
this.offset = offset;
}
@Override
public Node canonical(CanonicalizerTool tool) {
if (base instanceof RawAddressNode) {
// The RawAddressNode is redundant, just directly use its input as base.
return new OffsetAddressNode(((RawAddressNode) base).getAddress(), offset);
} else if (base instanceof OffsetAddressNode) {
// Rewrite (&base[offset1])[offset2] to base[offset1 + offset2].
OffsetAddressNode b = (OffsetAddressNode) base;
return new OffsetAddressNode(b.getBase(), BinaryArithmeticNode.add(b.getOffset(), this.getOffset()));
} else if (base instanceof AddNode) {
AddNode add = (AddNode) base;
if (add.getY().isConstant()) {
return new OffsetAddressNode(add.getX(), new AddNode(add.getY(), getOffset()));
}
}
return this;
}
@NodeIntrinsic
public static native Address address(Object base, long offset);
@Override
public long getMaxConstantDisplacement() {
Stamp curStamp = offset.stamp();
if (curStamp instanceof IntegerStamp) {
IntegerStamp integerStamp = (IntegerStamp) curStamp;
if (integerStamp.lowerBound() >= 0) {
return integerStamp.upperBound();
}
}
return Long.MAX_VALUE;
}
@Override
public ValueNode getIndex() {
return null;
}
}