Mercurial > hg > graal-jvmci-8
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/PiNode.java @ 10762:c483912aaf70
add ValueProxy interface and infrastructure
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Mon, 15 Jul 2013 16:39:11 +0200 |
parents | 815c675b07b0 |
children | 1aed684853f6 |
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/* * Copyright (c) 2012, 2013, 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 com.oracle.graal.nodes; import com.oracle.graal.api.meta.*; import com.oracle.graal.graph.*; import com.oracle.graal.nodes.extended.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; /** * A node that changes the type of its input, usually narrowing it. For example, a PiNode refines * the type of a receiver during type-guarded inlining to be the type tested by the guard. * * In contrast to a {@link GuardedValueNode}, a PiNode is useless as soon as the type of its input * is as narrow or narrower than the PiNode's type. The PiNode, and therefore also the scheduling * restriction enforced by the anchor, will go away. */ public class PiNode extends FloatingGuardedNode implements LIRLowerable, Virtualizable, Node.IterableNodeType, GuardingNode, Canonicalizable, ValueProxy { @Input private ValueNode object; public ValueNode object() { return object; } public PiNode(ValueNode object, Stamp stamp) { super(stamp); this.object = object; } public PiNode(ValueNode object, Stamp stamp, GuardingNode anchor) { super(stamp, anchor); this.object = object; } @Override public void generate(LIRGeneratorTool generator) { if (object.kind() != Kind.Void && object.kind() != Kind.Illegal) { generator.setResult(this, generator.operand(object)); } } @Override public boolean inferStamp() { return updateStamp(stamp().join(object().stamp())); } @Override public void virtualize(VirtualizerTool tool) { State state = tool.getObjectState(object); if (state != null && state.getState() == EscapeState.Virtual) { tool.replaceWithVirtual(state.getVirtualObject()); } } @Override public ValueNode canonical(CanonicalizerTool tool) { inferStamp(); if (stamp().equals(object().stamp())) { return object(); } return this; } @Override public ValueNode getOriginalValue() { return object; } }