--- /dev/null 2016-05-31 09:42:47.975716356 -0700 +++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/extended/LoadMethodNode.java 2016-12-09 00:55:34.116393450 -0800 @@ -0,0 +1,143 @@ +/* + * Copyright (c) 2013, 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 + * 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_3; +import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1; + +import org.graalvm.compiler.core.common.type.Stamp; +import org.graalvm.compiler.core.common.type.TypeReference; +import org.graalvm.compiler.debug.GraalError; +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.ConstantNode; +import org.graalvm.compiler.nodes.FixedWithNextNode; +import org.graalvm.compiler.nodes.ValueNode; +import org.graalvm.compiler.nodes.spi.Lowerable; +import org.graalvm.compiler.nodes.spi.LoweringTool; +import org.graalvm.compiler.nodes.type.StampTool; + +import jdk.vm.ci.meta.Assumptions; +import jdk.vm.ci.meta.Assumptions.AssumptionResult; +import jdk.vm.ci.meta.JavaConstant; +import jdk.vm.ci.meta.ResolvedJavaMethod; +import jdk.vm.ci.meta.ResolvedJavaType; + +/** + * Loads a method from the virtual method table of a given hub. + */ +@NodeInfo(cycles = CYCLES_3, size = SIZE_1) +public final class LoadMethodNode extends FixedWithNextNode implements Lowerable, Canonicalizable { + + public static final NodeClass TYPE = NodeClass.create(LoadMethodNode.class); + @Input ValueNode hub; + protected final ResolvedJavaMethod method; + protected final ResolvedJavaType receiverType; + + /** + * The caller or context type used to perform access checks when resolving {@link #method}. + */ + protected final ResolvedJavaType callerType; + + public ValueNode getHub() { + return hub; + } + + public LoadMethodNode(@InjectedNodeParameter Stamp stamp, ResolvedJavaMethod method, ResolvedJavaType receiverType, ResolvedJavaType callerType, ValueNode hub) { + super(TYPE, stamp); + this.receiverType = receiverType; + this.callerType = callerType; + this.hub = hub; + this.method = method; + assert method.isConcrete() : "Cannot load abstract method from a hub"; + assert method.hasReceiver() : "Cannot load a static method from a hub"; + if (!method.isInVirtualMethodTable(receiverType)) { + throw new GraalError("%s does not have a vtable entry in type %s", method, receiverType); + } + } + + @Override + public void lower(LoweringTool tool) { + tool.getLowerer().lower(this, tool); + } + + @Override + public Node canonical(CanonicalizerTool tool) { + if (hub instanceof LoadHubNode) { + ValueNode object = ((LoadHubNode) hub).getValue(); + TypeReference type = StampTool.typeReferenceOrNull(object); + if (type != null) { + if (type.isExact()) { + return resolveExactMethod(tool, type.getType()); + } + Assumptions assumptions = graph().getAssumptions(); + AssumptionResult resolvedMethod = type.getType().findUniqueConcreteMethod(method); + if (resolvedMethod != null && resolvedMethod.canRecordTo(assumptions) && !type.getType().isInterface() && method.getDeclaringClass().isAssignableFrom(type.getType())) { + resolvedMethod.recordTo(assumptions); + return ConstantNode.forConstant(stamp(), resolvedMethod.getResult().getEncoding(), tool.getMetaAccess()); + } + } + } + if (hub.isConstant()) { + return resolveExactMethod(tool, tool.getConstantReflection().asJavaType(hub.asConstant())); + } + + return this; + } + + /** + * Find the method which would be loaded. + * + * @param tool + * @param type the exact type of object being loaded from + * @return the method which would be invoked for {@code type} or null if it doesn't implement + * the method + */ + private Node resolveExactMethod(CanonicalizerTool tool, ResolvedJavaType type) { + ResolvedJavaMethod newMethod = type.resolveConcreteMethod(method, callerType); + if (newMethod == null) { + /* + * This really represent a misuse of LoadMethod since we're loading from a class which + * isn't known to implement the original method but for now at least fold it away. + */ + return ConstantNode.forConstant(stamp(), JavaConstant.NULL_POINTER, null); + } else { + return ConstantNode.forConstant(stamp(), newMethod.getEncoding(), tool.getMetaAccess()); + } + } + + public ResolvedJavaMethod getMethod() { + return method; + } + + public ResolvedJavaType getReceiverType() { + return receiverType; + } + + public ResolvedJavaType getCallerType() { + return callerType; + } +}