/*
* Copyright (c) 2011, 2016, 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.extended;
import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
import org.graalvm.compiler.core.common.LocationIdentity;
import org.graalvm.compiler.core.common.type.PrimitiveStamp;
import org.graalvm.compiler.core.common.type.Stamp;
import org.graalvm.compiler.core.common.type.StampFactory;
import org.graalvm.compiler.graph.Node;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.nodes.calc.ReinterpretNode;
import org.graalvm.compiler.nodes.java.LoadFieldNode;
import org.graalvm.compiler.nodes.spi.Lowerable;
import org.graalvm.compiler.nodes.spi.LoweringTool;
import org.graalvm.compiler.nodes.spi.Virtualizable;
import org.graalvm.compiler.nodes.spi.VirtualizerTool;
import org.graalvm.compiler.nodes.virtual.VirtualObjectNode;
import jdk.vm.ci.meta.Assumptions;
import jdk.vm.ci.meta.JavaKind;
import jdk.vm.ci.meta.ResolvedJavaField;
/**
* Load of a value from a location specified as an offset relative to an object. No null check is
* performed before the load.
*/
@NodeInfo(cycles = CYCLES_2, size = SIZE_1)
public class RawLoadNode extends UnsafeAccessNode implements Lowerable, Virtualizable {
public static final NodeClass<RawLoadNode> TYPE = NodeClass.create(RawLoadNode.class);
/**
* This constructor exists for node intrinsics that need a stamp based on {@code accessKind}.
*/
public RawLoadNode(ValueNode object, ValueNode offset, JavaKind accessKind, LocationIdentity locationIdentity) {
super(TYPE, StampFactory.forKind(accessKind.getStackKind()), object, offset, accessKind, locationIdentity, false);
}
/**
* This constructor exists for node intrinsics that need a stamp based on the return type of the
* {@link org.graalvm.compiler.graph.Node.NodeIntrinsic} annotated method.
*/
public RawLoadNode(@InjectedNodeParameter Stamp stamp, ValueNode object, ValueNode offset, LocationIdentity locationIdentity, JavaKind accessKind) {
super(TYPE, stamp, object, offset, accessKind, locationIdentity, false);
}
public RawLoadNode(NodeClass<? extends RawLoadNode> c, ValueNode object, ValueNode offset, JavaKind accessKind, LocationIdentity locationIdentity) {
super(c, StampFactory.forKind(accessKind.getStackKind()), object, offset, accessKind, locationIdentity, false);
}
@Override
public void lower(LoweringTool tool) {
tool.getLowerer().lower(this, tool);
}
@Override
public void virtualize(VirtualizerTool tool) {
ValueNode alias = tool.getAlias(object());
if (alias instanceof VirtualObjectNode) {
VirtualObjectNode virtual = (VirtualObjectNode) alias;
ValueNode offsetValue = tool.getAlias(offset());
if (offsetValue.isConstant()) {
long off = offsetValue.asJavaConstant().asLong();
int entryIndex = virtual.entryIndexForOffset(off, accessKind());
if (entryIndex != -1) {
ValueNode entry = tool.getEntry(virtual, entryIndex);
JavaKind entryKind = virtual.entryKind(entryIndex);
if (entry.getStackKind() == getStackKind() || entryKind == accessKind()) {
if (!(entry.stamp().isCompatible(stamp()))) {
if (entry.stamp() instanceof PrimitiveStamp && stamp instanceof PrimitiveStamp) {
PrimitiveStamp p1 = (PrimitiveStamp) stamp;
PrimitiveStamp p2 = (PrimitiveStamp) entry.stamp();
int width1 = p1.getBits();
int width2 = p2.getBits();
if (width1 == width2) {
Node replacement = new ReinterpretNode(p2, entry);
tool.replaceWith((ValueNode) replacement);
return;
} else {
// different bit width
return;
}
} else {
// cannot reinterpret for arbitrary objects
return;
}
}
tool.replaceWith(entry);
}
}
}
}
}
@Override
protected ValueNode cloneAsFieldAccess(Assumptions assumptions, ResolvedJavaField field) {
return LoadFieldNode.create(assumptions, object(), field);
}
@Override
protected ValueNode cloneAsArrayAccess(ValueNode location, LocationIdentity identity) {
return new RawLoadNode(object(), location, accessKind(), identity);
}
@NodeIntrinsic
public static native Object load(Object object, long offset, @ConstantNodeParameter JavaKind kind, @ConstantNodeParameter LocationIdentity locationIdentity);
}