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/*
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* Copyright (c) 2012, 2016, 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.nodes.extended;
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import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
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import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
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import org.graalvm.compiler.core.common.LocationIdentity;
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import org.graalvm.compiler.core.common.type.Stamp;
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import org.graalvm.compiler.graph.Node;
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import org.graalvm.compiler.graph.NodeClass;
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import org.graalvm.compiler.graph.spi.Canonicalizable;
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import org.graalvm.compiler.graph.spi.CanonicalizerTool;
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import org.graalvm.compiler.nodeinfo.NodeInfo;
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import org.graalvm.compiler.nodes.FixedWithNextNode;
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import org.graalvm.compiler.nodes.NamedLocationIdentity;
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import org.graalvm.compiler.nodes.ValueNode;
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import org.graalvm.compiler.nodes.type.StampTool;
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import jdk.vm.ci.meta.Assumptions;
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import jdk.vm.ci.meta.JavaKind;
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import jdk.vm.ci.meta.ResolvedJavaField;
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import jdk.vm.ci.meta.ResolvedJavaType;
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@NodeInfo(cycles = CYCLES_2, size = SIZE_1)
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public abstract class UnsafeAccessNode extends FixedWithNextNode implements Canonicalizable {
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public static final NodeClass<UnsafeAccessNode> TYPE = NodeClass.create(UnsafeAccessNode.class);
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@Input ValueNode object;
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@Input ValueNode offset;
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protected final JavaKind accessKind;
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protected final LocationIdentity locationIdentity;
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protected final boolean forceAnyLocation;
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protected UnsafeAccessNode(NodeClass<? extends UnsafeAccessNode> c, Stamp stamp, ValueNode object, ValueNode offset, JavaKind accessKind, LocationIdentity locationIdentity,
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boolean forceAnyLocation) {
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super(c, stamp);
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this.forceAnyLocation = forceAnyLocation;
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assert accessKind != null;
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assert locationIdentity != null;
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this.object = object;
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this.offset = offset;
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this.accessKind = accessKind;
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this.locationIdentity = locationIdentity;
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}
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public LocationIdentity getLocationIdentity() {
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return locationIdentity;
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}
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public boolean isAnyLocationForced() {
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return forceAnyLocation;
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}
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public ValueNode object() {
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return object;
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}
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public ValueNode offset() {
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return offset;
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}
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public JavaKind accessKind() {
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return accessKind;
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}
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@Override
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public Node canonical(CanonicalizerTool tool) {
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if (!isAnyLocationForced() && getLocationIdentity().isAny()) {
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if (offset().isConstant()) {
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long constantOffset = offset().asJavaConstant().asLong();
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// Try to canonicalize to a field access.
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ResolvedJavaType receiverType = StampTool.typeOrNull(object());
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if (receiverType != null) {
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ResolvedJavaField field = receiverType.findInstanceFieldWithOffset(constantOffset, accessKind());
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// No need for checking that the receiver is non-null. The field access includes
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// the null check and if a field is found, the offset is so small that this is
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// never a valid access of an arbitrary address.
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if (field != null && field.getJavaKind() == this.accessKind()) {
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assert !graph().isAfterFloatingReadPhase() : "cannot add more precise memory location after floating read phase";
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return cloneAsFieldAccess(graph().getAssumptions(), field);
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}
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}
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}
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ResolvedJavaType receiverType = StampTool.typeOrNull(object());
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// Try to build a better location identity.
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if (receiverType != null && receiverType.isArray()) {
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LocationIdentity identity = NamedLocationIdentity.getArrayLocation(receiverType.getComponentType().getJavaKind());
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assert !graph().isAfterFloatingReadPhase() : "cannot add more precise memory location after floating read phase";
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return cloneAsArrayAccess(offset(), identity);
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}
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}
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return this;
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}
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protected abstract ValueNode cloneAsFieldAccess(Assumptions assumptions, ResolvedJavaField field);
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protected abstract ValueNode cloneAsArrayAccess(ValueNode location, LocationIdentity identity);
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}
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