Mercurial > hg > graal-compiler
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/TypeSwitchNode.java @ 12052:0afe7370260c
refactored constantEquals(), lookupArrayLength() and readUnsafeConstant() out of MetaAccessProvider into ConstantReflectionProvider (GRAAL-511)
author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 11 Oct 2013 12:19:09 +0200 |
parents | 23ccaa863eda |
children | 29907e69ae8d |
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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.java; import java.util.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.api.meta.ResolvedJavaType.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.extended.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; import com.oracle.graal.nodes.util.*; /** * The {@code TypeSwitchNode} performs a lookup based on the type of the input value. The type * comparison is an exact type comparison, not an instanceof. */ public final class TypeSwitchNode extends SwitchNode implements LIRLowerable, Simplifiable { private final ResolvedJavaType[] keys; /** * Constructs a type switch instruction. The keyProbabilities array contain key.length + 1 * entries. The last entry in every array describes the default case. * * @param value the instruction producing the value being switched on, the object hub * @param successors the list of successors * @param keys the list of types * @param keyProbabilities the probabilities of the keys * @param keySuccessors the successor index for each key */ public TypeSwitchNode(ValueNode value, AbstractBeginNode[] successors, ResolvedJavaType[] keys, double[] keyProbabilities, int[] keySuccessors) { super(value, successors, keySuccessors, keyProbabilities); assert successors.length <= keys.length + 1; assert keySuccessors.length == keyProbabilities.length; this.keys = keys; } @Override public int keyCount() { return keys.length; } @Override public Constant keyAt(int index) { return keys[index].getEncoding(Representation.ObjectHub); } public ResolvedJavaType typeAt(int index) { return keys[index]; } @Override public void generate(LIRGeneratorTool gen) { gen.emitSwitch(this); } @Override public void simplify(SimplifierTool tool) { if (value() instanceof ConstantNode) { Constant constant = value().asConstant(); int survivingEdge = keySuccessorIndex(keyCount()); for (int i = 0; i < keyCount(); i++) { Constant typeHub = keyAt(i); assert constant.getKind() == typeHub.getKind(); if (tool.getConstantReflection().constantEquals(constant, typeHub)) { survivingEdge = keySuccessorIndex(i); } } for (int i = 0; i < blockSuccessorCount(); i++) { if (i != survivingEdge) { tool.deleteBranch(blockSuccessor(i)); } } tool.addToWorkList(blockSuccessor(survivingEdge)); graph().removeSplit(this, blockSuccessor(survivingEdge)); } if (value() instanceof LoadHubNode && ((LoadHubNode) value()).object().stamp() instanceof ObjectStamp) { ObjectStamp stamp = (ObjectStamp) ((LoadHubNode) value()).object().stamp(); if (stamp.type() != null) { int validKeys = 0; for (int i = 0; i < keyCount(); i++) { if (stamp.type().isAssignableFrom(keys[i])) { validKeys++; } } if (validKeys == 0) { tool.addToWorkList(defaultSuccessor()); graph().removeSplitPropagate(this, defaultSuccessor()); } else if (validKeys != keys.length) { ArrayList<AbstractBeginNode> newSuccessors = new ArrayList<>(blockSuccessorCount()); ResolvedJavaType[] newKeys = new ResolvedJavaType[validKeys]; int[] newKeySuccessors = new int[validKeys + 1]; double[] newKeyProbabilities = new double[validKeys + 1]; double totalProbability = 0; int current = 0; for (int i = 0; i < keyCount() + 1; i++) { if (i == keyCount() || stamp.type().isAssignableFrom(keys[i])) { int index = newSuccessors.indexOf(keySuccessor(i)); if (index == -1) { index = newSuccessors.size(); newSuccessors.add(keySuccessor(i)); } newKeySuccessors[current] = index; if (i < keyCount()) { newKeys[current] = keys[i]; } newKeyProbabilities[current] = keyProbability(i); totalProbability += keyProbability(i); current++; } } if (totalProbability > 0) { for (int i = 0; i < current; i++) { newKeyProbabilities[i] /= totalProbability; } } else { for (int i = 0; i < current; i++) { newKeyProbabilities[i] = 1.0 / current; } } for (int i = 0; i < blockSuccessorCount(); i++) { AbstractBeginNode successor = blockSuccessor(i); if (!newSuccessors.contains(successor)) { tool.deleteBranch(successor); } setBlockSuccessor(i, null); } AbstractBeginNode[] successorsArray = newSuccessors.toArray(new AbstractBeginNode[newSuccessors.size()]); TypeSwitchNode newSwitch = graph().add(new TypeSwitchNode(value(), successorsArray, newKeys, newKeyProbabilities, newKeySuccessors)); ((FixedWithNextNode) predecessor()).setNext(newSwitch); GraphUtil.killWithUnusedFloatingInputs(this); } } } } }