001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * The contents of this file are subject to the terms of either the GNU
007: * General Public License Version 2 only ("GPL") or the Common
008: * Development and Distribution License("CDDL") (collectively, the
009: * "License"). You may not use this file except in compliance with the
010: * License. You can obtain a copy of the License at
011: * http://www.netbeans.org/cddl-gplv2.html
012: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013: * specific language governing permissions and limitations under the
014: * License. When distributing the software, include this License Header
015: * Notice in each file and include the License file at
016: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
017: * particular file as subject to the "Classpath" exception as provided
018: * by Sun in the GPL Version 2 section of the License file that
019: * accompanied this code. If applicable, add the following below the
020: * License Header, with the fields enclosed by brackets [] replaced by
021: * your own identifying information:
022: * "Portions Copyrighted [year] [name of copyright owner]"
023: *
024: * Contributor(s):
025: * The Original Software is NetBeans. The Initial Developer of the Original
026: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
027: * Microsystems, Inc. All Rights Reserved.
028: *
029: * If you wish your version of this file to be governed by only the CDDL
030: * or only the GPL Version 2, indicate your decision by adding
031: * "[Contributor] elects to include this software in this distribution
032: * under the [CDDL or GPL Version 2] license." If you do not indicate a
033: * single choice of license, a recipient has the option to distribute
034: * your version of this file under either the CDDL, the GPL Version 2 or
035: * to extend the choice of license to its licensees as provided above.
036: * However, if you add GPL Version 2 code and therefore, elected the GPL
037: * Version 2 license, then the option applies only if the new code is
038: * made subject to such option by the copyright holder.
039: */
040:
041: package org.netbeans.lib.profiler.instrumentation;
042:
043: import org.netbeans.lib.profiler.classfile.DynamicClassInfo;
044: import org.netbeans.lib.profiler.global.CommonConstants;
045:
046: /**
047: * Support for adding multiple different fragments to a class's constant pool, that also keeps track of whether
048: * a particular fragment has already been added to this class or not.
049: * The main API call for this class is getCPFragment, that returns a relocated (i.e. with indices adjusted for a concrete
050: * given class) copy of added constant pool for particular injection type defined in JFluid. Once this operation is
051: * performed, the information is registered in the corresponding ClassInfo (it is assumed that a real class in the JVM is
052: * actually instrumented by adding this cpool fragment). Thus if subsequently for this class the constant pool fragment
053: * for the same injection type is requested again, an empty result is returned.
054: *
055: * When performing actual method instrumentation (bytecode rewriting), use cpool indices of injected methods defined as
056: * public static variables in CPExtensionsRepository. These variables need to be adjusted for the base cpool count value
057: * for the given class/injection type.
058: *
059: * @author Misha Dmitriev
060: */
061: public class DynamicConstantPoolExtension extends ConstantPoolExtension
062: implements CommonConstants {
063: //~ Static fields/initializers -----------------------------------------------------------------------------------------------
064:
065: //------------------------------------------ Private implementation -------------------------------------------------
066: private static DynamicConstantPoolExtension emptyECP = new DynamicConstantPoolExtension();
067:
068: //~ Instance fields ----------------------------------------------------------------------------------------------------------
069:
070: protected DynamicClassInfo clazz;
071:
072: //~ Constructors -------------------------------------------------------------------------------------------------------------
073:
074: protected DynamicConstantPoolExtension(DynamicClassInfo clazz,
075: int injectionType, int baseCPCount, int secondaryCPCount) {
076: super (CPExtensionsRepository
077: .getStandardCPFragment(injectionType), baseCPCount,
078: secondaryCPCount);
079: this .clazz = clazz;
080: }
081:
082: protected DynamicConstantPoolExtension() {
083: }
084:
085: //~ Methods ------------------------------------------------------------------------------------------------------------------
086:
087: /**
088: * Re-create the whole appended constant pool chunk out of (possibly several) fragments added for different
089: * kinds of instrumentation at possibly different times.
090: */
091: public static DynamicConstantPoolExtension getAllAddedCPFragments(
092: DynamicClassInfo clazz) {
093: DynamicConstantPoolExtension res = new DynamicConstantPoolExtension(); // Equivalent of emptyECP
094: int lowerBaseCPCountBound = 0;
095: int baseCPCLen = clazz.getBaseCPoolCountLen();
096:
097: for (int j = 0; j < baseCPCLen; j++) {
098: int minBaseCPCount = 0xFFFFFFF;
099: int cpFragmentIdx = -1;
100:
101: // Find the CP fragment with the minimum base index, that hasn't been used yet
102: for (int i = 0; i < baseCPCLen; i++) {
103: int curCPCount = clazz.getBaseCPoolCount(i);
104:
105: if (curCPCount != -1) {
106: if ((curCPCount > lowerBaseCPCountBound)
107: && (curCPCount < minBaseCPCount)) {
108: minBaseCPCount = curCPCount;
109: cpFragmentIdx = i;
110: }
111: }
112: }
113:
114: // If such a fragment exists, append it to the result. Otherwise return the final result.
115: if (cpFragmentIdx != -1) {
116: DynamicConstantPoolExtension res1 = newDynamicCPExtension(
117: clazz, cpFragmentIdx, clazz
118: .getBaseCPoolCount(cpFragmentIdx));
119: res.addedCPContents = res.getConcatenatedContents(res1); // Don't change res contents, because initially it's emptyECP
120: res.nAddedEntries += res1.nAddedEntries;
121: lowerBaseCPCountBound = minBaseCPCount;
122: } else {
123: return res;
124: }
125: }
126:
127: return res;
128: }
129:
130: public static DynamicConstantPoolExtension getCPFragment(
131: DynamicClassInfo clazz, int injType) {
132: if (clazz.getBaseCPoolCount(injType) != -1) {
133: return emptyECP; // clazz's cpool already extended for this instrumentation type
134: } else {
135: int currentCPCount = clazz.getCurrentCPoolCount();
136: DynamicConstantPoolExtension ecp = newDynamicCPExtension(
137: clazz, injType, currentCPCount);
138: clazz.setBaseCPoolCount(injType, currentCPCount);
139: clazz.setCurrentCPoolCount(currentCPCount
140: + ecp.nAddedEntries);
141:
142: return ecp;
143: }
144: }
145:
146: public static DynamicConstantPoolExtension getEmptyCPFragment() {
147: return emptyECP;
148: }
149:
150: //-------------------------------------------- Protected methods ---------------------------------------------------
151: protected static DynamicConstantPoolExtension newDynamicCPExtension(
152: DynamicClassInfo clazz, int injectionType, int baseCPCount) {
153: int secondaryCPCount = 0;
154:
155: switch (injectionType) {
156: case INJ_RECURSIVE_ROOT_METHOD:
157: case INJ_RECURSIVE_MARKER_METHOD:
158: secondaryCPCount = clazz
159: .getBaseCPoolCount(INJ_RECURSIVE_NORMAL_METHOD);
160:
161: break;
162: case INJ_RECURSIVE_SAMPLED_ROOT_METHOD:
163: case INJ_RECURSIVE_SAMPLED_MARKER_METHOD:
164: secondaryCPCount = clazz
165: .getBaseCPoolCount(INJ_RECURSIVE_SAMPLED_NORMAL_METHOD);
166:
167: break;
168: }
169:
170: return new DynamicConstantPoolExtension(clazz, injectionType,
171: baseCPCount, secondaryCPCount);
172: }
173: }
|