diff options
Diffstat (limited to 'src/proguard/optimize/evaluation/SimpleEnumDescriptorSimplifier.java')
| -rw-r--r-- | src/proguard/optimize/evaluation/SimpleEnumDescriptorSimplifier.java | 583 |
1 files changed, 583 insertions, 0 deletions
diff --git a/src/proguard/optimize/evaluation/SimpleEnumDescriptorSimplifier.java b/src/proguard/optimize/evaluation/SimpleEnumDescriptorSimplifier.java new file mode 100644 index 0000000..f1323ea --- /dev/null +++ b/src/proguard/optimize/evaluation/SimpleEnumDescriptorSimplifier.java @@ -0,0 +1,583 @@ +/* + * ProGuard -- shrinking, optimization, obfuscation, and preverification + * of Java bytecode. + * + * Copyright (c) 2002-2014 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.optimize.evaluation; + +import proguard.classfile.*; +import proguard.classfile.attribute.*; +import proguard.classfile.attribute.visitor.*; +import proguard.classfile.constant.*; +import proguard.classfile.constant.visitor.ConstantVisitor; +import proguard.classfile.editor.*; +import proguard.classfile.instruction.visitor.InstructionVisitor; +import proguard.classfile.util.*; +import proguard.classfile.visitor.*; +import proguard.optimize.info.*; + +/** + * This ClassVisitor simplifies the descriptors that contain simple enums in + * the program classes that it visits. + * + * @see SimpleEnumMarker + * @see MemberReferenceFixer + * @author Eric Lafortune + */ +public class SimpleEnumDescriptorSimplifier +extends SimplifiedVisitor +implements ClassVisitor, + ConstantVisitor, + MemberVisitor, + AttributeVisitor, + LocalVariableInfoVisitor, + LocalVariableTypeInfoVisitor +{ + //* + private static final boolean DEBUG = false; + /*/ + private static boolean DEBUG = System.getProperty("enum") != null; + //*/ + + + // Implementations for ClassVisitor. + + public void visitProgramClass(ProgramClass programClass) + { + if (DEBUG) + { + System.out.println("SimpleEnumDescriptorSimplifier: "+programClass.getName()); + } + + // Simplify the class members. + programClass.fieldsAccept(this); + programClass.methodsAccept(this); + + // Simplify the attributes. + //programClass.attributesAccept(this); + + // Simplify the simple enum array constants. + programClass.constantPoolEntriesAccept(this); + } + + + // Implementations for ConstantVisitor. + + public void visitAnyConstant(Clazz clazz, Constant constant) {} + + + public void visitStringConstant(Clazz clazz, StringConstant stringConstant) + { + // Does the constant refer to a simple enum type? + Clazz referencedClass = stringConstant.referencedClass; + if (isSimpleEnum(referencedClass)) + { + // Is it an array type? + String name = stringConstant.getString(clazz); + if (ClassUtil.isInternalArrayType(name)) + { + // Update the type. + ConstantPoolEditor constantPoolEditor = + new ConstantPoolEditor((ProgramClass)clazz); + + String newName = simplifyDescriptor(name, referencedClass); + + stringConstant.u2stringIndex = + constantPoolEditor.addUtf8Constant(newName); + + // Clear the referenced class. + stringConstant.referencedClass = null; + } + } + } + + + public void visitInvokeDynamicConstant(Clazz clazz, InvokeDynamicConstant invokeDynamicConstant) + { + // Update the descriptor if it has any simple enum classes. + String descriptor = invokeDynamicConstant.getType(clazz); + String newDescriptor = simplifyDescriptor(descriptor, invokeDynamicConstant.referencedClasses); + + if (!descriptor.equals(newDescriptor)) + { + // Update the descriptor. + ConstantPoolEditor constantPoolEditor = + new ConstantPoolEditor((ProgramClass)clazz); + + invokeDynamicConstant.u2nameAndTypeIndex = + constantPoolEditor.addNameAndTypeConstant(invokeDynamicConstant.getName(clazz), + newDescriptor); + + // Update the referenced classes. + invokeDynamicConstant.referencedClasses = + simplifyReferencedClasses(descriptor, invokeDynamicConstant.referencedClasses); + } + } + + + public void visitClassConstant(Clazz clazz, ClassConstant classConstant) + { + // Does the constant refer to a simple enum type? + Clazz referencedClass = classConstant.referencedClass; + if (isSimpleEnum(referencedClass)) + { + // Is it an array type? + String name = classConstant.getName(clazz); + if (ClassUtil.isInternalArrayType(name)) + { + // Update the type. + ConstantPoolEditor constantPoolEditor = + new ConstantPoolEditor((ProgramClass)clazz); + + String newName = simplifyDescriptor(name, referencedClass); + + classConstant.u2nameIndex = + constantPoolEditor.addUtf8Constant(newName); + + // Clear the referenced class. + classConstant.referencedClass = null; + } + } + } + + + // Implementations for MemberVisitor. + + public void visitProgramField(ProgramClass programClass, ProgramField programField) + { + // Update the descriptor if it has a simple enum class. + String descriptor = programField.getDescriptor(programClass); + String newDescriptor = simplifyDescriptor(descriptor, programField.referencedClass); + + if (!descriptor.equals(newDescriptor)) + { + String name = programField.getName(programClass); + String newName = name + ClassConstants.SPECIAL_MEMBER_SEPARATOR + Long.toHexString(Math.abs((descriptor).hashCode())); + + if (DEBUG) + { + System.out.println("SimpleEnumDescriptorSimplifier: ["+programClass.getName()+"."+name+" "+descriptor + "] -> ["+newName+" "+newDescriptor+"]"); + } + + ConstantPoolEditor constantPoolEditor = + new ConstantPoolEditor(programClass); + + // Update the name. + programField.u2nameIndex = + constantPoolEditor.addUtf8Constant(newName); + + // Update the descriptor itself. + programField.u2descriptorIndex = + constantPoolEditor.addUtf8Constant(newDescriptor); + + // Clear the referenced class. + programField.referencedClass = null; + + // Clear the field value. + FieldOptimizationInfo fieldOptimizationInfo = + FieldOptimizationInfo.getFieldOptimizationInfo(programField); + if (fieldOptimizationInfo != null) + { + fieldOptimizationInfo.resetValue(programClass, programField); + } + + // Simplify the signature. + programField.attributesAccept(programClass, this); + } + } + + + public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod) + { +// // Skip the valueOf method. +// if (programMethod.getName(programClass).equals(ClassConstants.METHOD_NAME_VALUEOF)) +// { +// return; +// } + + // Simplify the code, the signature, and the parameter annotations, + // before simplifying the descriptor. + programMethod.attributesAccept(programClass, this); + + // Update the descriptor if it has any simple enum classes. + String descriptor = programMethod.getDescriptor(programClass); + String newDescriptor = simplifyDescriptor(descriptor, programMethod.referencedClasses); + + if (!descriptor.equals(newDescriptor)) + { + String name = programMethod.getName(programClass); + String newName = name; + + // Append a code, if the method isn't a class instance initializer. + if (!name.equals(ClassConstants.METHOD_NAME_INIT)) + { + newName += ClassConstants.SPECIAL_MEMBER_SEPARATOR + Long.toHexString(Math.abs((descriptor).hashCode())); + } + + if (DEBUG) + { + System.out.println("SimpleEnumDescriptorSimplifier: ["+programClass.getName()+"."+name+descriptor+"] -> ["+newName+newDescriptor+"]"); + } + + ConstantPoolEditor constantPoolEditor = + new ConstantPoolEditor(programClass); + + // Update the name, if necessary. + if (!newName.equals(name)) + { + programMethod.u2nameIndex = + constantPoolEditor.addUtf8Constant(newName); + } + + // Update the descriptor itself. + programMethod.u2descriptorIndex = + constantPoolEditor.addUtf8Constant(newDescriptor); + + // Update the referenced classes. + programMethod.referencedClasses = + simplifyReferencedClasses(descriptor, programMethod.referencedClasses); + } + } + + + // Implementations for AttributeVisitor. + + public void visitAnyAttribute(Clazz clazz, Attribute attribute) {} + + + public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute) + { + // Simplify the local variable descriptors. + codeAttribute.attributesAccept(clazz, method, this); + } + + + public void visitLocalVariableTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableTableAttribute localVariableTableAttribute) + { + // Change the references of the local variables. + localVariableTableAttribute.localVariablesAccept(clazz, method, codeAttribute, this); + } + + + public void visitLocalVariableTypeTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableTypeTableAttribute localVariableTypeTableAttribute) + { + // Change the references of the local variables. + localVariableTypeTableAttribute.localVariablesAccept(clazz, method, codeAttribute, this); + } + + + public void visitSignatureAttribute(Clazz clazz, Field field, SignatureAttribute signatureAttribute) + { + // We're only looking at the base type for now. + if (signatureAttribute.referencedClasses != null && + signatureAttribute.referencedClasses.length > 0) + { + // Update the signature if it has any simple enum classes. + String signature = signatureAttribute.getSignature(clazz); + String newSignature = simplifyDescriptor(signature, + signatureAttribute.referencedClasses[0]); + + if (!signature.equals(newSignature)) + { + // Update the signature. + signatureAttribute.u2signatureIndex = + new ConstantPoolEditor((ProgramClass)clazz).addUtf8Constant(newSignature); + + // Clear the referenced class. + signatureAttribute.referencedClasses[0] = null; + } + } + } + + + public void visitSignatureAttribute(Clazz clazz, Method method, SignatureAttribute signatureAttribute) + { + // Compute the new signature. + String signature = signatureAttribute.getSignature(clazz); + String newSignature = simplifyDescriptor(signature, + signatureAttribute.referencedClasses); + + if (!signature.equals(newSignature)) + { + // Update the signature. + signatureAttribute.u2signatureIndex = + new ConstantPoolEditor((ProgramClass)clazz).addUtf8Constant(newSignature); + } + } + + + // Implementations for LocalVariableInfoVisitor. + + public void visitLocalVariableInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableInfo localVariableInfo) + { + // Update the descriptor if it has a simple enum class. + String descriptor = localVariableInfo.getDescriptor(clazz); + String newDescriptor = simplifyDescriptor(descriptor, localVariableInfo.referencedClass); + + if (!descriptor.equals(newDescriptor)) + { + // Update the descriptor. + localVariableInfo.u2descriptorIndex = + new ConstantPoolEditor((ProgramClass)clazz).addUtf8Constant(newDescriptor); + + // Clear the referenced class. + localVariableInfo.referencedClass = null; + } + } + + + // Implementations for LocalVariableTypeInfoVisitor. + + public void visitLocalVariableTypeInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableTypeInfo localVariableTypeInfo) + { + // We're only looking at the base type for now. + if (localVariableTypeInfo.referencedClasses != null && + localVariableTypeInfo.referencedClasses.length > 0) + { + // Update the signature if it has any simple enum classes. + String signature = localVariableTypeInfo.getSignature(clazz); + String newSignature = simplifyDescriptor(signature, + localVariableTypeInfo.referencedClasses[0]); + + if (!signature.equals(newSignature)) + { + // Update the signature. + localVariableTypeInfo.u2signatureIndex = + new ConstantPoolEditor((ProgramClass)clazz).addUtf8Constant(newSignature); + + // Clear the referenced class. + localVariableTypeInfo.referencedClasses[0] = null; + } + } + } + + + // Small utility methods. + + /** + * Returns the descriptor with simplified enum type. + */ + private String simplifyDescriptor(String descriptor, + Clazz referencedClass) + { + return isSimpleEnum(referencedClass) ? + descriptor.substring(0, ClassUtil.internalArrayTypeDimensionCount(descriptor)) + ClassConstants.TYPE_INT : + descriptor; + } + + + /** + * Returns the descriptor with simplified enum types. + */ + private String simplifyDescriptor(String descriptor, + Clazz[] referencedClasses) + { + if (referencedClasses != null) + { + InternalTypeEnumeration internalTypeEnumeration = + new InternalTypeEnumeration(descriptor); + + int referencedClassIndex = 0; + + StringBuffer newDescriptorBuffer = + new StringBuffer(descriptor.length()); + + // Go over the formal type parameters. + { + // Consider the classes referenced by this formal type + // parameter. + String type = internalTypeEnumeration.formalTypeParameters(); + int count = new DescriptorClassEnumeration(type).classCount(); + + // Replace simple enum types. + for (int counter = 0; counter < count; counter++) + { + Clazz referencedClass = + referencedClasses[referencedClassIndex++]; + + if (isSimpleEnum(referencedClass)) + { + // Let's replace the simple enum type by + // java.lang.Integer. + type = + type.substring(0, ClassUtil.internalArrayTypeDimensionCount(type)) + + ClassConstants.NAME_JAVA_LANG_INTEGER; + } + } + + newDescriptorBuffer.append(type); + } + + newDescriptorBuffer.append(ClassConstants.METHOD_ARGUMENTS_OPEN); + + // Go over the parameters. + while (internalTypeEnumeration.hasMoreTypes()) + { + // Consider the classes referenced by this parameter type. + String type = internalTypeEnumeration.nextType(); + int count = new DescriptorClassEnumeration(type).classCount(); + + // Replace simple enum types. + for (int counter = 0; counter < count; counter++) + { + Clazz referencedClass = + referencedClasses[referencedClassIndex++]; + + if (isSimpleEnum(referencedClass)) + { + type = + type.substring(0, ClassUtil.internalArrayTypeDimensionCount(type)) + + ClassConstants.TYPE_INT; + } + } + + newDescriptorBuffer.append(type); + } + + newDescriptorBuffer.append(ClassConstants.METHOD_ARGUMENTS_CLOSE); + + // Go over the return value. + { + String type = internalTypeEnumeration.returnType(); + int count = new DescriptorClassEnumeration(type).classCount(); + + // Replace simple enum types. + for (int counter = 0; counter < count; counter++) + { + Clazz referencedClass = + referencedClasses[referencedClassIndex++]; + + if (isSimpleEnum(referencedClass)) + { + type = + type.substring(0, ClassUtil.internalArrayTypeDimensionCount(type)) + + ClassConstants.TYPE_INT; + } + } + + newDescriptorBuffer.append(type); + } + + descriptor = newDescriptorBuffer.toString(); + } + + return descriptor; + } + + + /** + * Returns the simplified and shrunk array of referenced classes for the + * given descriptor. + */ + private Clazz[] simplifyReferencedClasses(String descriptor, + Clazz[] referencedClasses) + { + if (referencedClasses != null) + { + InternalTypeEnumeration internalTypeEnumeration = + new InternalTypeEnumeration(descriptor); + + int referencedClassIndex = 0; + int newReferencedClassIndex = 0; + + // Go over the formal type parameters. + { + String type = internalTypeEnumeration.formalTypeParameters(); + int count = new DescriptorClassEnumeration(type).classCount(); + + // Clear all non-simple enum classes + // (now java.lang.Integer). + for (int counter = 0; counter < count; counter++) + { + Clazz referencedClass = + referencedClasses[referencedClassIndex++]; + + referencedClasses[newReferencedClassIndex++] = + isSimpleEnum(referencedClass) ? null : referencedClass; + } + } + + // Go over the parameters. + while (internalTypeEnumeration.hasMoreTypes()) + { + // Consider the classes referenced by this parameter type. + String type = internalTypeEnumeration.nextType(); + int count = new DescriptorClassEnumeration(type).classCount(); + + // Copy all non-simple enum classes. + for (int counter = 0; counter < count; counter++) + { + Clazz referencedClass = + referencedClasses[referencedClassIndex++]; + + if (!isSimpleEnum(referencedClass)) + { + referencedClasses[newReferencedClassIndex++] = + referencedClass; + } + } + } + + // Go over the return type. + { + String type = internalTypeEnumeration.returnType(); + int count = new DescriptorClassEnumeration(type).classCount(); + + // Copy all non-simple enum classes. + for (int counter = 0; counter < count; counter++) + { + Clazz referencedClass = + referencedClasses[referencedClassIndex++]; + + if (!isSimpleEnum(referencedClass)) + { + referencedClasses[newReferencedClassIndex++] = + referencedClass; + } + } + } + + // Shrink the array to the proper size. + if (newReferencedClassIndex == 0) + { + referencedClasses = null; + } + else if (newReferencedClassIndex < referencedClassIndex) + { + Clazz[] newReferencedClasses = new Clazz[newReferencedClassIndex]; + System.arraycopy(referencedClasses, 0, + newReferencedClasses, 0, + newReferencedClassIndex); + + referencedClasses = newReferencedClasses; + } + } + + return referencedClasses; + } + + + /** + * Returns whether the given class is not null and a simple enum class. + */ + private boolean isSimpleEnum(Clazz clazz) + { + return clazz != null && + SimpleEnumMarker.isSimpleEnum(clazz); + } +} |