Mercurial > hg > graal-jvmci-8
annotate graal/Compiler/src/com/sun/c1x/opt/TypeAnalyzer.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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1 /* |
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2 * Copyright (c) 2009, 2010, 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.sun.c1x.opt; |
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24 |
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25 import com.sun.c1x.graph.IR; |
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26 import com.sun.cri.ri.*; |
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27 |
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28 /** |
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29 * This class implements an iterative, flow-sensitve type analysis that can be |
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30 * used to remove redundant checkcasts and instanceof tests as well as devirtualize |
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31 * and deinterface method calls. |
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32 * |
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33 * @author Ben L. Titzer |
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34 */ |
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35 public class TypeAnalyzer { |
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36 |
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37 final IR ir; |
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38 |
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39 public TypeAnalyzer(IR ir) { |
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40 this.ir = ir; |
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41 } |
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42 |
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43 // type information sources: |
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44 // new, anewarray, newarray |
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45 // parameter types |
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46 // instanceof |
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47 // checkcast |
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48 // array stores |
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49 // array loads |
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50 // field loads |
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51 // exception handler type |
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52 // equality comparison |
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53 // call to Object.clone() |
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54 // call to Class.newInstance() |
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55 // call to Array.newInstance() |
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56 // call to Class.isInstance() |
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57 |
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58 // possible optimizations: |
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59 // remove redundant checkcasts |
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60 // fold instanceof tests |
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61 // remove dead branches in folded instanceof |
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62 // detect redundant store checks |
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63 // convert invokeinterface to invokevirtual when possible |
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64 // convert invokevirtual to invokespecial when possible |
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65 // remove finalizer checks |
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66 // specialize array copy calls |
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67 // transform reflective Class.newInstance() into allocation |
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68 // transform reflective Array.newInstance() into allocation |
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69 // transform reflective Class.isInstance() to checkcast |
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70 // transform reflective method invocation to direct method invocation |
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71 |
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72 private static class TypeApprox { |
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73 final RiType type = null; |
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74 final boolean exact = false; |
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75 } |
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76 } |