Mercurial > hg > graal-compiler
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/PhiNode.java @ 6546:79119bd2505a
Call target can be null, so don't crash debug printer
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Wed, 10 Oct 2012 20:29:07 -0700 |
parents | 6f2b35ef59b0 |
children | 4667e5f25fce |
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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 com.oracle.graal.api.meta.*; import com.oracle.graal.graph.*; import com.oracle.graal.nodes.calc.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; /** * The {@code PhiNode} represents the merging of dataflow in the graph. It refers to a merge * and a variable. */ @NodeInfo(nameTemplate = "{p#type/s}Phi({i#values})") public final class PhiNode extends FloatingNode implements Canonicalizable, Node.IterableNodeType { public static enum PhiType { Value(null), // normal value phis Memory(StampFactory.dependency()); public final Stamp stamp; PhiType(Stamp stamp) { this.stamp = stamp; } } @Input(notDataflow = true) private MergeNode merge; @Input private final NodeInputList<ValueNode> values = new NodeInputList<>(this); private final PhiType type; /** * Create a value phi ({@link PhiType#Value}) with the specified kind. * @param kind the kind of the value * @param merge the merge that the new phi belongs to */ public PhiNode(Kind kind, MergeNode merge) { super(StampFactory.forKind(kind)); this.type = PhiType.Value; this.merge = merge; } /** * Create a non-value phi ({@link PhiType#Memory} with the specified kind. * @param type the type of the new phi * @param merge the merge that the new phi belongs to */ public PhiNode(PhiType type, MergeNode merge) { super(type.stamp); assert type.stamp != null : merge + " " + type; this.type = type; this.merge = merge; } public PhiType type() { return type; } public MergeNode merge() { return merge; } public void setMerge(MergeNode x) { updateUsages(merge, x); merge = x; } public NodeInputList<ValueNode> values() { return values; } @Override public boolean inferStamp() { if (type == PhiType.Value) { return inferPhiStamp(); } else { return false; } } public boolean inferPhiStamp() { return updateStamp(StampTool.meet(values())); } @Override public boolean verify() { assertTrue(merge() != null, "missing merge"); assertTrue(merge().phiPredecessorCount() == valueCount(), "mismatch between merge predecessor count and phi value count: %d != %d", merge().phiPredecessorCount(), valueCount()); if (type == PhiType.Value) { for (ValueNode v : values()) { assertTrue(v.kind() == kind(), "all phi values must have same kind"); } } return super.verify(); } /** * Get the instruction that produces the value associated with the i'th predecessor of the merge. * * @param i the index of the predecessor * @return the instruction that produced the value in the i'th predecessor */ public ValueNode valueAt(int i) { return values.get(i); } /** * Sets the value at the given index and makes sure that the values list is large enough. * @param i the index at which to set the value * @param x the new phi input value for the given location */ public void initializeValueAt(int i, ValueNode x) { while (values().size() <= i) { values.add(null); } values.set(i, x); } public void setValueAt(int i, ValueNode x) { values.set(i, x); } public ValueNode valueAt(EndNode pred) { return valueAt(merge().phiPredecessorIndex(pred)); } /** * Get the number of inputs to this phi (i.e. the number of predecessors to the merge). * * @return the number of inputs in this phi */ public int valueCount() { return values.size(); } public void clearValues() { values.clear(); } @Override public String toString(Verbosity verbosity) { if (verbosity == Verbosity.Name) { StringBuilder str = new StringBuilder(); for (int i = 0; i < valueCount(); ++i) { if (i != 0) { str.append(' '); } str.append(valueAt(i) == null ? "-" : valueAt(i).toString(Verbosity.Id)); } if (type == PhiType.Value) { return super.toString(Verbosity.Name) + "(" + str + ")"; } else { return type + super.toString(Verbosity.Name) + "(" + str + ")"; } } else { return super.toString(verbosity); } } public void addInput(ValueNode x) { assert !(x instanceof PhiNode) || ((PhiNode) x).merge() instanceof LoopBeginNode || ((PhiNode) x).merge() != this.merge(); values.add(x); } public void removeInput(int index) { values.remove(index); } public ValueNode singleValue() { ValueNode differentValue = null; for (ValueNode n : values()) { if (n != this) { if (differentValue == null) { differentValue = n; } else if (differentValue != n) { return null; } } } return differentValue; } public ValueNode singleBackValue() { assert merge() instanceof LoopBeginNode; ValueNode differentValue = null; for (ValueNode n : values().subList(merge().forwardEndCount(), values().size())) { if (differentValue == null) { differentValue = n; } else if (differentValue != n) { return null; } } return differentValue; } @Override public ValueNode canonical(CanonicalizerTool tool) { ValueNode singleValue = singleValue(); if (singleValue != null) { return singleValue; } return this; } public ValueNode firstValue() { return valueAt(0); } public boolean isLoopPhi() { return merge() instanceof LoopBeginNode; } }