| /* |
| * Copyright (c) 2012, 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 |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| |
| 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.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.NodeInfo; |
| import org.graalvm.compiler.nodes.FixedWithNextNode; |
| import org.graalvm.compiler.nodes.NamedLocationIdentity; |
| import org.graalvm.compiler.nodes.ValueNode; |
| import org.graalvm.compiler.nodes.type.StampTool; |
| import jdk.internal.vm.compiler.word.LocationIdentity; |
| |
| import jdk.vm.ci.meta.Assumptions; |
| import jdk.vm.ci.meta.JavaKind; |
| import jdk.vm.ci.meta.ResolvedJavaField; |
| import jdk.vm.ci.meta.ResolvedJavaType; |
| |
| @NodeInfo(cycles = CYCLES_2, size = SIZE_1) |
| public abstract class UnsafeAccessNode extends FixedWithNextNode implements Canonicalizable { |
| |
| public static final NodeClass<UnsafeAccessNode> TYPE = NodeClass.create(UnsafeAccessNode.class); |
| @Input ValueNode object; |
| @Input ValueNode offset; |
| protected final JavaKind accessKind; |
| protected final LocationIdentity locationIdentity; |
| protected final boolean forceAnyLocation; |
| |
| protected UnsafeAccessNode(NodeClass<? extends UnsafeAccessNode> c, Stamp stamp, ValueNode object, ValueNode offset, JavaKind accessKind, LocationIdentity locationIdentity, |
| boolean forceAnyLocation) { |
| super(c, stamp); |
| this.forceAnyLocation = forceAnyLocation; |
| assert accessKind != null; |
| assert locationIdentity != null; |
| this.object = object; |
| this.offset = offset; |
| this.accessKind = accessKind; |
| this.locationIdentity = locationIdentity; |
| } |
| |
| public LocationIdentity getLocationIdentity() { |
| return locationIdentity; |
| } |
| |
| public boolean isAnyLocationForced() { |
| return forceAnyLocation; |
| } |
| |
| public ValueNode object() { |
| return object; |
| } |
| |
| public ValueNode offset() { |
| return offset; |
| } |
| |
| public JavaKind accessKind() { |
| return accessKind; |
| } |
| |
| @Override |
| public Node canonical(CanonicalizerTool tool) { |
| if (!isAnyLocationForced() && getLocationIdentity().isAny()) { |
| if (offset().isConstant()) { |
| long constantOffset = offset().asJavaConstant().asLong(); |
| |
| // Try to canonicalize to a field access. |
| ResolvedJavaType receiverType = StampTool.typeOrNull(object()); |
| if (receiverType != null) { |
| ResolvedJavaField field = receiverType.findInstanceFieldWithOffset(constantOffset, accessKind()); |
| // No need for checking that the receiver is non-null. The field access includes |
| // the null check and if a field is found, the offset is so small that this is |
| // never a valid access of an arbitrary address. |
| if (field != null && field.getJavaKind() == this.accessKind()) { |
| assert !graph().isAfterFloatingReadPhase() : "cannot add more precise memory location after floating read phase"; |
| // Unsafe accesses never have volatile semantics. |
| // Memory barriers are placed around such an unsafe access at construction |
| // time if necessary, unlike AccessFieldNodes which encapsulate their |
| // potential volatile semantics. |
| return cloneAsFieldAccess(graph().getAssumptions(), field, false); |
| } |
| } |
| } |
| ResolvedJavaType receiverType = StampTool.typeOrNull(object()); |
| // Try to build a better location identity. |
| if (receiverType != null && receiverType.isArray()) { |
| LocationIdentity identity = NamedLocationIdentity.getArrayLocation(receiverType.getComponentType().getJavaKind()); |
| assert !graph().isAfterFloatingReadPhase() : "cannot add more precise memory location after floating read phase"; |
| return cloneAsArrayAccess(offset(), identity); |
| } |
| } |
| |
| return this; |
| } |
| |
| protected ValueNode cloneAsFieldAccess(Assumptions assumptions, ResolvedJavaField field) { |
| return cloneAsFieldAccess(assumptions, field, field.isVolatile()); |
| } |
| |
| protected abstract ValueNode cloneAsFieldAccess(Assumptions assumptions, ResolvedJavaField field, boolean volatileAccess); |
| |
| protected abstract ValueNode cloneAsArrayAccess(ValueNode location, LocationIdentity identity); |
| } |