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Diffstat (limited to 'src/proguard/classfile/util/ClassSuperHierarchyInitializer.java')
| -rw-r--r-- | src/proguard/classfile/util/ClassSuperHierarchyInitializer.java | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/src/proguard/classfile/util/ClassSuperHierarchyInitializer.java b/src/proguard/classfile/util/ClassSuperHierarchyInitializer.java new file mode 100644 index 0000000..af2a209 --- /dev/null +++ b/src/proguard/classfile/util/ClassSuperHierarchyInitializer.java @@ -0,0 +1,168 @@ +/* + * ProGuard -- shrinking, optimization, obfuscation, and preverification + * of Java bytecode. + * + * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu) + * + * 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. + * <p> + * 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. + * <p> + * 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, 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; + } + + // Discard the name Strings. From now on, we'll use the object + // references. + libraryClass.superClassName = null; + libraryClass.interfaceNames = null; + } + + + // 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 <code>null</code> 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; + } +} |