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annotate graal/GraalCompiler/src/com/sun/c1x/opt/TypeAnalyzer.java @ 2509:16b9a8b5ad39

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Renamings Runtime=>GraalRuntime and Compiler=>GraalCompiler
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:50:44 +0200
parents graal/Compiler/src/com/sun/c1x/opt/TypeAnalyzer.java@9ec15d6914ca
children
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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 }