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1 /*
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2 * Copyright 2004 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.utilities;
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26
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27 import java.util.regex.*;
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28
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29 /** Provides helper routines for parsing simple C++ expressions such
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30 as "(JavaThread *) 0xf00" and "Universe::_collectedHeap". */
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31
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32 public class CPPExpressions {
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33 private static Pattern castPattern;
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34
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35 /** Represents a cast expression such as "(JavaThread *)
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36 0xf00". Returns both the type to which we are casting as well as
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37 the address. */
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38 public static class CastExpr {
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39 private String type;
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40 private String address;
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41
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42 private CastExpr(String type, String address) {
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43 this.type = type;
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44 this.address = address;
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45 }
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46
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47 public String getType() {
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48 return type;
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49 }
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50
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51 public String getAddress() {
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52 return address;
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53 }
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54 }
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55
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56 /** Represents a static field expression such as "Universe::_collectedHeap". */
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57 public static class StaticFieldExpr {
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58 private String containingType;
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59 private String fieldName;
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60
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61 private StaticFieldExpr(String containingType, String fieldName) {
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62 this.containingType = containingType;
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63 this.fieldName = fieldName;
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64 }
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65
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66 public String getContainingType() {
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67 return containingType;
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68 }
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69
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70 public String getFieldName() {
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71 return fieldName;
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72 }
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73 }
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74
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75 /** Attempts to parse the given string into a CastExpr. Returns null
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76 if the string did not match the supported pattern. */
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77 public static CastExpr parseCast(String expr) {
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78 if (castPattern == null) {
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79 castPattern = Pattern.compile("\\s*\\(\\s*([0-9A-Za-z:_]*)\\s*\\*\\s*\\)\\s*([0-9a-zA-Z]*)\\s*");
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80 }
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81 Matcher matcher = castPattern.matcher(expr);
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82 if (matcher.matches()) {
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83 String type = matcher.group(1);
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84 String addr = matcher.group(2);
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85 return new CastExpr(type, addr);
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86 }
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87 return null;
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88 }
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89
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90 /** Attempts to parse the given string into a
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91 StaticFieldExpr. Returns null if the string did not match the
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92 supported pattern. */
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93 public static StaticFieldExpr parseStaticField(String expr) {
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94 String sep = "::";
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95 int idx = expr.lastIndexOf(sep);
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96 if (idx < 0) {
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97 return null;
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98 }
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99 String containingType = expr.substring(0, idx);
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100 String fieldName = expr.substring(idx + sep.length(), expr.length());
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101 return new StaticFieldExpr(containingType, fieldName);
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102 }
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103 }
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