Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/PiNode.java @ 11869:18824519c172
Merge.
author | Chris Seaton <chris.seaton@oracle.com> |
---|---|
date | Wed, 02 Oct 2013 15:37:06 +0100 |
parents | a28f24553ffa |
children | 9a747d8e0d0f |
line wrap: on
line source
/* * 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, 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, ValueNode anchor) { super(stamp, (GuardingNode) anchor); this.object = object; } public PiNode(ValueNode object, ResolvedJavaType toType, boolean exactType, boolean nonNull) { this(object, StampFactory.object(toType, exactType, nonNull || ObjectStamp.isObjectNonNull(object.stamp()))); } @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() { if (stamp() == StampFactory.forNodeIntrinsic()) { return false; } return updateStamp(stamp().join(object().stamp())); } @Override public void virtualize(VirtualizerTool tool) { State state = tool.getObjectState(object); if (state != null && state.getState() == EscapeState.Virtual) { assert ObjectStamp.typeOrNull(this).isAssignableFrom(state.getVirtualObject().type()); 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; } @NodeIntrinsic public static native <T> T piCast(Object object, @ConstantNodeParameter Stamp stamp); @NodeIntrinsic public static native <T> T piCast(Object object, @ConstantNodeParameter Stamp stamp, GuardingNode anchor); @SuppressWarnings("unused") @NodeIntrinsic public static <T> T piCast(Object object, @ConstantNodeParameter Class<T> toType, @ConstantNodeParameter boolean exactType, @ConstantNodeParameter boolean nonNull) { return toType.cast(object); } }