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view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/MergeNode.java @ 18113:8dbe2b479bc8
cherry-pick: 8035650: Exclude AIX from VS.NET make/windows/projectcreator.make
Contributed-by: mgronlun
Reviewed-by: dholmes, sla
author | mgronlun |
---|---|
date | Thu, 16 Oct 2014 16:11:58 +0200 |
parents | 45b45f902bed |
children | f57d86eb036f |
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/* * Copyright (c) 2009, 2011, 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 static com.oracle.graal.graph.iterators.NodePredicates.*; import java.util.*; import com.oracle.graal.debug.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.iterators.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodeinfo.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.util.*; /** * Denotes the merging of multiple control-flow paths. */ @NodeInfo(allowedUsageTypes = {InputType.Association}) public class MergeNode extends BeginStateSplitNode implements IterableNodeType, LIRLowerable { public static MergeNode create() { return new MergeNode(); } protected MergeNode() { } @Input(InputType.Association) protected NodeInputList<AbstractEndNode> ends = new NodeInputList<>(this); @Override public void generate(NodeLIRBuilderTool gen) { gen.visitMerge(this); } public int forwardEndIndex(AbstractEndNode end) { return ends.indexOf(end); } public void addForwardEnd(AbstractEndNode end) { ends.add(end); } public int forwardEndCount() { return ends.size(); } public AbstractEndNode forwardEndAt(int index) { return ends.get(index); } @Override public NodeIterable<AbstractEndNode> cfgPredecessors() { return ends; } /** * Determines if a given node is a phi whose {@linkplain PhiNode#merge() merge} is this node. * * @param value the instruction to test * @return {@code true} if {@code value} is a phi and its merge is {@code this} */ public boolean isPhiAtMerge(Node value) { return value instanceof PhiNode && ((PhiNode) value).merge() == this; } /** * Removes the given end from the merge, along with the entries corresponding to this end in the * phis connected to the merge. * * @param pred the end to remove */ public void removeEnd(AbstractEndNode pred) { int predIndex = phiPredecessorIndex(pred); assert predIndex != -1; deleteEnd(pred); for (PhiNode phi : phis().snapshot()) { if (phi.isDeleted()) { continue; } ValueNode removedValue = phi.valueAt(predIndex); phi.removeInput(predIndex); if (removedValue != null && removedValue.isAlive() && removedValue.usages().isEmpty() && GraphUtil.isFloatingNode().apply(removedValue)) { GraphUtil.killWithUnusedFloatingInputs(removedValue); } } } protected void deleteEnd(AbstractEndNode end) { ends.remove(end); } public void clearEnds() { ends.clear(); } public NodeInputList<AbstractEndNode> forwardEnds() { return ends; } public int phiPredecessorCount() { return forwardEndCount(); } public int phiPredecessorIndex(AbstractEndNode pred) { return forwardEndIndex(pred); } public AbstractEndNode phiPredecessorAt(int index) { return forwardEndAt(index); } public NodeIterable<PhiNode> phis() { return this.usages().filter(PhiNode.class).filter(this::isPhiAtMerge); } @Override public NodeIterable<Node> anchored() { return super.anchored().filter(n -> !isPhiAtMerge(n)); } /** * This simplify method can deal with a null value for tool, so that it can be used outside of * canonicalization. */ @Override public void simplify(SimplifierTool tool) { FixedNode currentNext = next(); if (currentNext instanceof AbstractEndNode) { AbstractEndNode origLoopEnd = (AbstractEndNode) currentNext; MergeNode merge = origLoopEnd.merge(); if (merge instanceof LoopBeginNode && !(origLoopEnd instanceof LoopEndNode)) { return; } // in order to move anchored values to the other merge we would need to check if the // anchors are used by phis of the other merge if (this.anchored().isNotEmpty()) { return; } if (merge.stateAfter() == null && this.stateAfter() != null) { // We hold a state, but the succeeding merge does not => do not combine. return; } for (PhiNode phi : phis()) { if (phi.usages().filter(isNotA(VirtualState.class)).and(node -> !merge.isPhiAtMerge(node)).isNotEmpty()) { return; } } Debug.log("Split %s into ends for %s.", this, merge); int numEnds = this.forwardEndCount(); for (int i = 0; i < numEnds - 1; i++) { AbstractEndNode end = forwardEndAt(numEnds - 1 - i); if (tool != null) { tool.addToWorkList(end); } AbstractEndNode newEnd; if (merge instanceof LoopBeginNode) { newEnd = graph().add(LoopEndNode.create((LoopBeginNode) merge)); } else { newEnd = graph().add(EndNode.create()); merge.addForwardEnd(newEnd); } for (PhiNode phi : merge.phis()) { ValueNode v = phi.valueAt(origLoopEnd); ValueNode newInput; if (isPhiAtMerge(v)) { PhiNode endPhi = (PhiNode) v; newInput = endPhi.valueAt(end); } else { newInput = v; } phi.addInput(newInput); } this.removeEnd(end); end.replaceAtPredecessor(newEnd); end.safeDelete(); if (tool != null) { tool.addToWorkList(newEnd.predecessor()); } } graph().reduceTrivialMerge(this); } else if (currentNext instanceof ReturnNode) { ReturnNode returnNode = (ReturnNode) currentNext; if (anchored().isNotEmpty() || returnNode.getMemoryMap() != null) { return; } List<PhiNode> phis = phis().snapshot(); for (PhiNode phi : phis) { for (Node usage : phi.usages().filter(isNotA(FrameState.class))) { if (usage != returnNode) { return; } } } ValuePhiNode returnValuePhi = returnNode.result() == null || !isPhiAtMerge(returnNode.result()) ? null : (ValuePhiNode) returnNode.result(); List<AbstractEndNode> endNodes = forwardEnds().snapshot(); for (AbstractEndNode end : endNodes) { ReturnNode newReturn = graph().add(ReturnNode.create(returnValuePhi == null ? returnNode.result() : returnValuePhi.valueAt(end))); if (tool != null) { tool.addToWorkList(end.predecessor()); } end.replaceAtPredecessor(newReturn); } GraphUtil.killCFG(this); for (AbstractEndNode end : endNodes) { end.safeDelete(); } for (PhiNode phi : phis) { if (phi.isAlive() && phi.usages().isEmpty()) { GraphUtil.killWithUnusedFloatingInputs(phi); } } } } }