| /* |
| * Copyright (c) 2011, 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.java; |
| |
| import static org.graalvm.compiler.nodeinfo.InputType.State; |
| import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_UNKNOWN; |
| import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_20; |
| import static org.graalvm.compiler.nodes.java.ForeignCallDescriptors.REGISTER_FINALIZER; |
| |
| import org.graalvm.compiler.core.common.spi.ForeignCallLinkage; |
| import org.graalvm.compiler.core.common.type.ObjectStamp; |
| import org.graalvm.compiler.core.common.type.StampFactory; |
| 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.AbstractStateSplit; |
| import org.graalvm.compiler.nodes.DeoptimizingNode; |
| import org.graalvm.compiler.nodes.FrameState; |
| import org.graalvm.compiler.nodes.ValueNode; |
| import org.graalvm.compiler.nodes.spi.LIRLowerable; |
| import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool; |
| 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.Assumptions.AssumptionResult; |
| |
| /** |
| * This node is used to perform the finalizer registration at the end of the java.lang.Object |
| * constructor. |
| */ |
| // @formatter:off |
| @NodeInfo(cycles = CYCLES_UNKNOWN, |
| cyclesRationale = "We cannot estimate the time of a runtime call.", |
| size = SIZE_20, |
| sizeRationale = "Rough estimation for register handling & calling") |
| // @formatter:on |
| public final class RegisterFinalizerNode extends AbstractStateSplit implements Canonicalizable.Unary<ValueNode>, LIRLowerable, Virtualizable, DeoptimizingNode.DeoptAfter { |
| |
| public static final NodeClass<RegisterFinalizerNode> TYPE = NodeClass.create(RegisterFinalizerNode.class); |
| @OptionalInput(State) FrameState deoptState; |
| @Input ValueNode value; |
| |
| public RegisterFinalizerNode(ValueNode value) { |
| super(TYPE, StampFactory.forVoid()); |
| this.value = value; |
| } |
| |
| @Override |
| public ValueNode getValue() { |
| return value; |
| } |
| |
| @Override |
| public void generate(NodeLIRBuilderTool gen) { |
| // Note that an unconditional call to the runtime routine is made without |
| // checking that the object actually has a finalizer. This requires the |
| // runtime routine to do the check. |
| ForeignCallLinkage linkage = gen.getLIRGeneratorTool().getForeignCalls().lookupForeignCall(REGISTER_FINALIZER); |
| gen.getLIRGeneratorTool().emitForeignCall(linkage, gen.state(this), gen.operand(getValue())); |
| } |
| |
| /** |
| * Determines if the compiler should emit code to test whether a given object has a finalizer |
| * that must be registered with the runtime upon object initialization. |
| */ |
| public static boolean mayHaveFinalizer(ValueNode object, Assumptions assumptions) { |
| ObjectStamp objectStamp = (ObjectStamp) object.stamp(); |
| if (objectStamp.isExactType()) { |
| return objectStamp.type().hasFinalizer(); |
| } else if (objectStamp.type() != null) { |
| AssumptionResult<Boolean> result = objectStamp.type().hasFinalizableSubclass(); |
| if (result.canRecordTo(assumptions)) { |
| result.recordTo(assumptions); |
| return result.getResult(); |
| } |
| } |
| return true; |
| } |
| |
| @Override |
| public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) { |
| if (!(forValue.stamp() instanceof ObjectStamp)) { |
| return this; |
| } |
| if (!mayHaveFinalizer(forValue, graph().getAssumptions())) { |
| return null; |
| } |
| |
| return this; |
| } |
| |
| @Override |
| public void virtualize(VirtualizerTool tool) { |
| ValueNode alias = tool.getAlias(getValue()); |
| if (alias instanceof VirtualObjectNode && !((VirtualObjectNode) alias).type().hasFinalizer()) { |
| tool.delete(); |
| } |
| } |
| |
| @Override |
| public boolean canDeoptimize() { |
| return true; |
| } |
| |
| @NodeIntrinsic |
| public static native void register(Object thisObj); |
| } |