All Downloads are FREE. Search and download functionalities are using the official Maven repository.

proguard.classfile.util.ClassSuperHierarchyInitializer Maven / Gradle / Ivy

There is a newer version: 6.3.0beta1
Show newest version
/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification
 *             of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.util;

import proguard.classfile.*;
import proguard.classfile.constant.ClassConstant;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.visitor.ClassVisitor;

/**
 * This ClassVisitor initializes the superclass hierarchy of all classes that
 * it visits.
 * 

* Visited library classes get direct references to their superclasses and * interfaces, replacing the superclass names and interface names. The direct * references are equivalent to the names, but they are more efficient to work * with. *

* This visitor optionally prints warnings if some superclasses can't be found * or if they are in the program class pool. * * @author Eric Lafortune */ public class ClassSuperHierarchyInitializer extends SimplifiedVisitor implements ClassVisitor, ConstantVisitor { private final ClassPool programClassPool; private final ClassPool libraryClassPool; private final WarningPrinter missingWarningPrinter; private final WarningPrinter dependencyWarningPrinter; /** * Creates a new ClassSuperHierarchyInitializer that initializes the super * hierarchy of all visited class files. */ public ClassSuperHierarchyInitializer(ClassPool programClassPool, ClassPool libraryClassPool) { this(programClassPool, libraryClassPool, null, null); } /** * Creates a new ClassSuperHierarchyInitializer that initializes the super * hierarchy of all visited class files, optionally printing warnings if * some classes can't be found or if they are in the program class pool. */ public ClassSuperHierarchyInitializer(ClassPool programClassPool, ClassPool libraryClassPool, WarningPrinter missingWarningPrinter, WarningPrinter dependencyWarningPrinter) { this.programClassPool = programClassPool; this.libraryClassPool = libraryClassPool; this.missingWarningPrinter = missingWarningPrinter; this.dependencyWarningPrinter = dependencyWarningPrinter; } // Implementations for ClassVisitor. public void visitProgramClass(ProgramClass programClass) { // Link to the super class. programClass.superClassConstantAccept(this); // Link to the interfaces. programClass.interfaceConstantsAccept(this); } public void visitLibraryClass(LibraryClass libraryClass) { String className = libraryClass.getName(); // Link to the super class. String superClassName = libraryClass.superClassName; if (superClassName != null) { // Keep a reference to the superclass. libraryClass.superClass = findClass(className, superClassName); } // Link to the interfaces. if (libraryClass.interfaceNames != null) { String[] interfaceNames = libraryClass.interfaceNames; Clazz[] interfaceClasses = new Clazz[interfaceNames.length]; for (int index = 0; index < interfaceNames.length; index++) { // Keep a reference to the interface class. interfaceClasses[index] = findClass(className, interfaceNames[index]); } libraryClass.interfaceClasses = interfaceClasses; } } // Implementations for ConstantVisitor. public void visitClassConstant(Clazz clazz, ClassConstant classConstant) { classConstant.referencedClass = findClass(clazz.getName(), classConstant.getName(clazz)); } // Small utility methods. /** * Returns the class with the given name, either for the program class pool * or from the library class pool, or null if it can't be found. */ private Clazz findClass(String referencingClassName, String name) { // First look for the class in the program class pool. Clazz clazz = programClassPool.getClass(name); // Otherwise look for the class in the library class pool. if (clazz == null) { clazz = libraryClassPool.getClass(name); if (clazz == null && missingWarningPrinter != null) { // We didn't find the superclass or interface. Print a warning. missingWarningPrinter.print(referencingClassName, name, "Warning: " + ClassUtil.externalClassName(referencingClassName) + ": can't find superclass or interface " + ClassUtil.externalClassName(name)); } } else if (dependencyWarningPrinter != null) { // The superclass or interface was found in the program class pool. // Print a warning. dependencyWarningPrinter.print(referencingClassName, name, "Warning: library class " + ClassUtil.externalClassName(referencingClassName) + " extends or implements program class " + ClassUtil.externalClassName(name)); } return clazz; } }





© 2015 - 2024 Weber Informatics LLC | Privacy Policy