001: /*
002: * ProGuard -- shrinking, optimization, obfuscation, and preverification
003: * of Java bytecode.
004: *
005: * Copyright (c) 2002-2003 Eric Lafortune (eric@graphics.cornell.edu)
006: *
007: * This program is free software; you can redistribute it and/or modify it
008: * under the terms of the GNU General Public License as published by the Free
009: * Software Foundation; either version 2 of the License, or (at your option)
010: * any later version.
011: *
012: * This program is distributed in the hope that it will be useful, but WITHOUT
013: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
014: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
015: * more details.
016: *
017: * You should have received a copy of the GNU General Public License along
018: * with this program; if not, write to the Free Software Foundation, Inc.,
019: * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
020: */
021: package proguard.optimize.peephole;
022:
023: import proguard.classfile.*;
024: import proguard.classfile.util.*;
025: import proguard.classfile.visitor.*;
026: import proguard.optimize.KeepMarker;
027:
028: /**
029: * This <code>ClassVisitor</code> and <code>MemberVisitor</code>
030: * makes the classes it visits, and their methods, final, if possible.
031: *
032: * @author Eric Lafortune
033: */
034: public class ClassFinalizer extends SimplifiedVisitor implements
035: ClassVisitor, MemberVisitor {
036: private final ClassVisitor extraClassVisitor;
037: private final MemberVisitor extraMemberVisitor;
038:
039: private final MemberFinder memberFinder = new MemberFinder();
040:
041: /**
042: * Creates a new ClassFinalizer.
043: */
044: public ClassFinalizer() {
045: this (null, null);
046: }
047:
048: /**
049: * Creates a new ClassFinalizer.
050: * @param extraClassVisitor an optional extra visitor for all finalized
051: * classes.
052: * @param extraMemberVisitor an optional extra visitor for all finalized
053: * methods.
054: */
055: public ClassFinalizer(ClassVisitor extraClassVisitor,
056: MemberVisitor extraMemberVisitor) {
057: this .extraClassVisitor = extraClassVisitor;
058: this .extraMemberVisitor = extraMemberVisitor;
059: }
060:
061: // Implementations for ClassVisitor.
062:
063: public void visitProgramClass(ProgramClass programClass) {
064: // If the class is not final/interface/abstract,
065: // and it is not being kept,
066: // and it doesn't have any subclasses,
067: // then make it final.
068: if ((programClass.u2accessFlags & (ClassConstants.INTERNAL_ACC_FINAL
069: | ClassConstants.INTERNAL_ACC_INTERFACE | ClassConstants.INTERNAL_ACC_ABSTRACT)) == 0
070: && !KeepMarker.isKept(programClass)
071: && programClass.subClasses == null) {
072: programClass.u2accessFlags |= ClassConstants.INTERNAL_ACC_FINAL;
073:
074: // Visit the class, if required.
075: if (extraClassVisitor != null) {
076: extraClassVisitor.visitProgramClass(programClass);
077: }
078: }
079:
080: // Check all methods.
081: programClass.methodsAccept(this );
082: }
083:
084: // Implementations for MemberVisitor.
085:
086: public void visitProgramMethod(ProgramClass programClass,
087: ProgramMethod programMethod) {
088: String name = programMethod.getName(programClass);
089:
090: // If the method is not already private/static/final/abstract,
091: // and it is not a constructor,
092: // and its class is final,
093: // or it is not being kept and it is not overridden,
094: // then make it final.
095: if ((programMethod.u2accessFlags & (ClassConstants.INTERNAL_ACC_PRIVATE
096: | ClassConstants.INTERNAL_ACC_STATIC
097: | ClassConstants.INTERNAL_ACC_FINAL | ClassConstants.INTERNAL_ACC_ABSTRACT)) == 0
098: && !name
099: .equals(ClassConstants.INTERNAL_METHOD_NAME_INIT)
100: && ((programClass.u2accessFlags & ClassConstants.INTERNAL_ACC_FINAL) != 0 || (!KeepMarker
101: .isKept(programMethod) && (programClass.subClasses == null || !memberFinder
102: .isOverriden(programClass, programMethod))))) {
103: programMethod.u2accessFlags |= ClassConstants.INTERNAL_ACC_FINAL;
104:
105: // Visit the method, if required.
106: if (extraMemberVisitor != null) {
107: extraMemberVisitor.visitProgramMethod(programClass,
108: programMethod);
109: }
110: }
111: }
112: }
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