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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/PiNode.java @ 6467:5d398a326315

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documented PiNode
author Doug Simon <doug.simon@oracle.com>
date Mon, 01 Oct 2012 16:02:39 +0200
parents 01d274503562
children 6db6881c1270
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1 /*
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2 * Copyright (c) 2012, 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.nodes;
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24
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25 import com.oracle.graal.nodes.calc.*;
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26 import com.oracle.graal.nodes.spi.*;
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27 import com.oracle.graal.nodes.type.*;
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29 /**
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30 * A node that changes the type of its input, usually narrowing it.
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31 * For example, a PI node refines the type of a receiver during
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32 * type-guarded inlining to be the type tested by the guard.
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33 */
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34 public class PiNode extends FloatingNode implements LIRLowerable {
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35
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36 @Input private ValueNode object;
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37 @Input(notDataflow = true) private final FixedNode anchor;
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38
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39 public ValueNode object() {
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40 return object;
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41 }
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42
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43 public FixedNode anchor() {
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44 return anchor;
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45 }
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46
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47 public PiNode(ValueNode object, FixedNode anchor, Stamp stamp) {
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48 super(stamp);
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49 this.object = object;
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50 this.anchor = anchor;
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51 }
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52
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53 @Override
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54 public void generate(LIRGeneratorTool generator) {
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55 generator.setResult(this, generator.operand(object));
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56 }
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58 @Override
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59 public boolean inferStamp() {
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60 if (object().objectStamp().alwaysNull() && objectStamp().nonNull()) {
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61 // a null value flowing into a nonNull PiNode can happen should be guarded by a type/isNull guard, but the
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62 // compiler might see this situation before the branch is deleted
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63 return false;
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64 }
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65 return updateStamp(stamp().join(object().stamp()));
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66 }
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67 }