| /* |
| * 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<LoadMethodNode> 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<ResolvedJavaMethod> 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; |
| } |
| } |