diff options
Diffstat (limited to 'third_party/java/proguard/proguard5.3.3/src/proguard/shrink/Shrinker.java')
| -rw-r--r-- | third_party/java/proguard/proguard5.3.3/src/proguard/shrink/Shrinker.java | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/third_party/java/proguard/proguard5.3.3/src/proguard/shrink/Shrinker.java b/third_party/java/proguard/proguard5.3.3/src/proguard/shrink/Shrinker.java new file mode 100644 index 0000000000..60524ba0df --- /dev/null +++ b/third_party/java/proguard/proguard5.3.3/src/proguard/shrink/Shrinker.java @@ -0,0 +1,192 @@ +/* + * ProGuard -- shrinking, optimization, obfuscation, and preverification + * of Java bytecode. + * + * Copyright (c) 2002-2017 Eric Lafortune @ GuardSquare + * + * 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.shrink; + +import proguard.*; +import proguard.classfile.*; +import proguard.classfile.attribute.visitor.*; +import proguard.classfile.visitor.*; + +import java.io.*; + +/** + * This class shrinks class pools according to a given configuration. + * + * @author Eric Lafortune + */ +public class Shrinker +{ + private final Configuration configuration; + + + /** + * Creates a new Shrinker. + */ + public Shrinker(Configuration configuration) + { + this.configuration = configuration; + } + + + /** + * Performs shrinking of the given program class pool. + */ + public ClassPool execute(ClassPool programClassPool, + ClassPool libraryClassPool) throws IOException + { + // Check if we have at least some keep commands. + if (configuration.keep == null) + { + throw new IOException("You have to specify '-keep' options for the shrinking step."); + } + + // Clean up any old visitor info. + programClassPool.classesAccept(new ClassCleaner()); + libraryClassPool.classesAccept(new ClassCleaner()); + + // Create a visitor for marking the seeds. + UsageMarker usageMarker = configuration.whyAreYouKeeping == null ? + new UsageMarker() : + new ShortestUsageMarker(); + + // Automatically mark the parameterless constructors of seed classes, + // mainly for convenience and for backward compatibility. + ClassVisitor classUsageMarker = + new MultiClassVisitor(new ClassVisitor[] + { + usageMarker, + new NamedMethodVisitor(ClassConstants.METHOD_NAME_INIT, + ClassConstants.METHOD_TYPE_INIT, + usageMarker) + }); + + ClassPoolVisitor classPoolvisitor = + ClassSpecificationVisitorFactory.createClassPoolVisitor(configuration.keep, + classUsageMarker, + usageMarker, + true, + false, + false); + // Mark the seeds. + programClassPool.accept(classPoolvisitor); + libraryClassPool.accept(classPoolvisitor); + libraryClassPool.classesAccept(usageMarker); + + // Mark interfaces that have to be kept. + programClassPool.classesAccept(new InterfaceUsageMarker(usageMarker)); + + // Mark the inner class and annotation information that has to be kept. + programClassPool.classesAccept( + new UsedClassFilter(usageMarker, + new AllAttributeVisitor(true, + new MultiAttributeVisitor(new AttributeVisitor[] + { + new InnerUsageMarker(usageMarker), + new AnnotationUsageMarker(usageMarker), + new LocalVariableTypeUsageMarker(usageMarker) + })))); + + // Should we explain ourselves? + if (configuration.whyAreYouKeeping != null) + { + System.out.println(); + + // Create a visitor for explaining classes and class members. + ShortestUsagePrinter shortestUsagePrinter = + new ShortestUsagePrinter((ShortestUsageMarker)usageMarker, + configuration.verbose); + + ClassPoolVisitor whyClassPoolvisitor = + ClassSpecificationVisitorFactory.createClassPoolVisitor(configuration.whyAreYouKeeping, + shortestUsagePrinter, + shortestUsagePrinter); + + // Mark the seeds. + programClassPool.accept(whyClassPoolvisitor); + libraryClassPool.accept(whyClassPoolvisitor); + } + + if (configuration.printUsage != null) + { + PrintStream ps = + configuration.printUsage == Configuration.STD_OUT ? System.out : + new PrintStream( + new BufferedOutputStream( + new FileOutputStream(configuration.printUsage))); + + // Print out items that will be removed. + programClassPool.classesAcceptAlphabetically( + new UsagePrinter(usageMarker, true, ps)); + + if (ps == System.out) + { + ps.flush(); + } + else + { + ps.close(); + } + } + + // Clean up used program classes and discard unused program classes. + int originalProgramClassPoolSize = programClassPool.size(); + + ClassPool newProgramClassPool = new ClassPool(); + programClassPool.classesAccept( + new UsedClassFilter(usageMarker, + new MultiClassVisitor( + new ClassVisitor[] { + new ClassShrinker(usageMarker), + new ClassPoolFiller(newProgramClassPool) + }))); + + programClassPool.clear(); + + // Clean up library classes. + libraryClassPool.classesAccept( + new ClassShrinker(usageMarker)); + + // Check if we have at least some output classes. + int newProgramClassPoolSize = newProgramClassPool.size(); + + if (configuration.verbose) + { + System.out.println("Removing unused program classes and class elements..."); + System.out.println(" Original number of program classes: " + originalProgramClassPoolSize); + System.out.println(" Final number of program classes: " + newProgramClassPoolSize); + } + + if (newProgramClassPoolSize == 0 && + (configuration.warn == null || !configuration.warn.isEmpty())) + { + if (configuration.ignoreWarnings) + { + System.err.println("Warning: the output jar is empty. Did you specify the proper '-keep' options?"); + } + else + { + throw new IOException("The output jar is empty. Did you specify the proper '-keep' options?"); + } + } + + return newProgramClassPool; + } +} |