diff options
Diffstat (limited to 'third_party/java/proguard/proguard5.3.3/src/proguard/optimize/peephole/RetargetedInnerClassAttributeRemover.java')
| -rw-r--r-- | third_party/java/proguard/proguard5.3.3/src/proguard/optimize/peephole/RetargetedInnerClassAttributeRemover.java | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/third_party/java/proguard/proguard5.3.3/src/proguard/optimize/peephole/RetargetedInnerClassAttributeRemover.java b/third_party/java/proguard/proguard5.3.3/src/proguard/optimize/peephole/RetargetedInnerClassAttributeRemover.java new file mode 100644 index 0000000000..34364b4888 --- /dev/null +++ b/third_party/java/proguard/proguard5.3.3/src/proguard/optimize/peephole/RetargetedInnerClassAttributeRemover.java @@ -0,0 +1,170 @@ +/* + * 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.optimize.peephole; + +import proguard.classfile.*; +import proguard.classfile.attribute.*; +import proguard.classfile.attribute.visitor.*; +import proguard.classfile.constant.ClassConstant; +import proguard.classfile.constant.visitor.ConstantVisitor; +import proguard.classfile.util.SimplifiedVisitor; +import proguard.classfile.visitor.ClassVisitor; + +import java.util.Arrays; + +/** + * This ClassVisitor removes InnerClasses and EnclosingMethod attributes in + * classes that are retargeted or that refer to classes that are retargeted. + * + * @see ClassMerger + * @author Eric Lafortune + */ +public class RetargetedInnerClassAttributeRemover +extends SimplifiedVisitor +implements ClassVisitor, + AttributeVisitor, + InnerClassesInfoVisitor, + ConstantVisitor +{ + private boolean retargeted; + + + // Implementations for ClassVisitor. + + public void visitProgramClass(ProgramClass programClass) + { + int attributesCount = programClass.u2attributesCount; + Attribute[] attributes = programClass.attributes; + + int newAtributesCount = 0; + + // Copy over all non-retargeted attributes. + for (int index = 0; index < attributesCount; index++) + { + Attribute attribute = attributes[index]; + + // Check if it's an InnerClasses or EnclosingMethod attribute in + // a retargeted class or referring to a retargeted class. + retargeted = false; + attribute.accept(programClass, this); + if (!retargeted) + { + attributes[newAtributesCount++] = attribute; + } + } + + // Clean up any remaining array elements. + Arrays.fill(attributes, newAtributesCount, attributesCount, null); + + // Update the number of attributes. + programClass.u2attributesCount = newAtributesCount; + } + + + // Implementations for AttributeVisitor. + + public void visitAnyAttribute(Clazz clazz, Attribute attribute) {} + + + public void visitInnerClassesAttribute(Clazz clazz, InnerClassesAttribute innerClassesAttribute) + { + // Check whether the class itself is retargeted. + checkTarget(clazz); + + if (!retargeted) + { + // Check whether the referenced classes are retargeted. + innerClassesAttribute.innerClassEntriesAccept(clazz, this); + int classesCount = innerClassesAttribute.u2classesCount; + InnerClassesInfo[] classes = innerClassesAttribute.classes; + + int newClassesCount = 0; + + // Copy over all non-retargeted attributes. + for (int index = 0; index < classesCount; index++) + { + InnerClassesInfo classInfo = classes[index]; + + // Check if the outer class or inner class is a retargeted class. + retargeted = false; + classInfo.outerClassConstantAccept(clazz, this); + classInfo.innerClassConstantAccept(clazz, this); + if (!retargeted) + { + classes[newClassesCount++] = classInfo; + } + } + + // Clean up any remaining array elements. + Arrays.fill(classes, newClassesCount, classesCount, null); + + // Update the number of classes. + innerClassesAttribute.u2classesCount = newClassesCount; + + // Remove the attribute altogether if it's empty. + retargeted = newClassesCount == 0; + } + } + + + public void visitEnclosingMethodAttribute(Clazz clazz, EnclosingMethodAttribute enclosingMethodAttribute) + { + // Check whether the class itself is retargeted. + checkTarget(clazz); + + // Check whether the referenced class is retargeted. + checkTarget(enclosingMethodAttribute.referencedClass); + } + + + // Implementations for InnerClassesInfoVisitor. + + public void visitInnerClassesInfo(Clazz clazz, InnerClassesInfo innerClassesInfo) + { + // Check whether the inner class or the outer class are retargeted. + innerClassesInfo.innerClassConstantAccept(clazz, this); + innerClassesInfo.outerClassConstantAccept(clazz, this); + } + + + // Implementations for ConstantVisitor. + + public void visitClassConstant(Clazz clazz, ClassConstant classConstant) + { + // Check whether the referenced class is retargeted. + checkTarget(classConstant.referencedClass); + } + + + // Small utility methods. + + /** + * Sets the global return value to true if the given class is retargeted. + */ + private void checkTarget(Clazz clazz) + { + if (clazz != null && + ClassMerger.getTargetClass(clazz) != null) + { + retargeted = true; + } + } +}
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