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Diffstat (limited to 'src/proguard/classfile/editor/VariableRemapper.java')
| -rw-r--r-- | src/proguard/classfile/editor/VariableRemapper.java | 214 |
1 files changed, 0 insertions, 214 deletions
diff --git a/src/proguard/classfile/editor/VariableRemapper.java b/src/proguard/classfile/editor/VariableRemapper.java deleted file mode 100644 index 1ca1cb5..0000000 --- a/src/proguard/classfile/editor/VariableRemapper.java +++ /dev/null @@ -1,214 +0,0 @@ -/* - * 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.classfile.editor; - -import proguard.classfile.*; -import proguard.classfile.attribute.*; -import proguard.classfile.attribute.annotation.*; -import proguard.classfile.attribute.annotation.target.*; -import proguard.classfile.attribute.annotation.target.visitor.*; -import proguard.classfile.attribute.annotation.visitor.TypeAnnotationVisitor; -import proguard.classfile.attribute.visitor.*; -import proguard.classfile.instruction.*; -import proguard.classfile.instruction.visitor.InstructionVisitor; -import proguard.classfile.util.SimplifiedVisitor; - -/** - * This AttributeVisitor remaps variable indexes in all attributes that it - * visits, based on a given index map. - * - * @author Eric Lafortune - */ -public class VariableRemapper -extends SimplifiedVisitor -implements AttributeVisitor, - InstructionVisitor, - LocalVariableInfoVisitor, - LocalVariableTypeInfoVisitor, - TypeAnnotationVisitor, - TargetInfoVisitor, - LocalVariableTargetElementVisitor -{ - private static final boolean DEBUG = false; - - - private final CodeAttributeEditor codeAttributeEditor = new CodeAttributeEditor(); - - private int[] variableMap; - - - /** - * Sets the given mapping of old variable indexes to their new indexes. - * Variables that should disappear can be mapped to -1. - */ - public void setVariableMap(int[] variableMap) - { - this.variableMap = variableMap; - } - - - // Implementations for AttributeVisitor. - - public void visitAnyAttribute(Clazz clazz, Attribute attribute) {} - - - public void visitMethodParametersAttribute(Clazz clazz, Method method, MethodParametersAttribute methodParametersAttribute) - { - // Reorder the array with parameter information. - ParameterInfo[] oldParameters = methodParametersAttribute.parameters; - ParameterInfo[] newParameters = - new ParameterInfo[methodParametersAttribute.u1parametersCount]; - - for (int index = 0; index < methodParametersAttribute.u1parametersCount; index++) - { - newParameters[remapVariable(index)] = oldParameters[index]; - } - - methodParametersAttribute.parameters = newParameters; - } - - - public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute) - { - if (DEBUG) - { - System.out.println("VariableRemapper: "+clazz.getName()+"."+method.getName(clazz)+method.getDescriptor(clazz)); - for (int index= 0; index < codeAttribute.u2maxLocals; index++) - { - System.out.println(" v"+index+" -> "+variableMap[index]); - } - } - - // Remap the variables of the attributes, before editing the code and - // cleaning up its local variable frame. - codeAttribute.attributesAccept(clazz, method, this); - - // Initially, the code attribute editor doesn't contain any changes. - codeAttributeEditor.reset(codeAttribute.u4codeLength); - - // Remap the variables of the instructions. - codeAttribute.instructionsAccept(clazz, method, this); - - // Apply the code atribute editor. - codeAttributeEditor.visitCodeAttribute(clazz, method, codeAttribute); - } - - - public void visitLocalVariableTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableTableAttribute localVariableTableAttribute) - { - // Remap the variable references of the local variables. - localVariableTableAttribute.localVariablesAccept(clazz, method, codeAttribute, this); - } - - - public void visitLocalVariableTypeTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableTypeTableAttribute localVariableTypeTableAttribute) - { - // Remap the variable references of the local variables. - localVariableTypeTableAttribute.localVariablesAccept(clazz, method, codeAttribute, this); - } - - - public void visitAnyTypeAnnotationsAttribute(Clazz clazz, TypeAnnotationsAttribute typeAnnotationsAttribute) - { - // Remap the variable references of local variable type annotations. - typeAnnotationsAttribute.typeAnnotationsAccept(clazz, this); - } - - - // Implementations for LocalVariableInfoVisitor. - - public void visitLocalVariableInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableInfo localVariableInfo) - { - localVariableInfo.u2index = - remapVariable(localVariableInfo.u2index); - } - - - // Implementations for LocalVariableTypeInfoVisitor. - - public void visitLocalVariableTypeInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableTypeInfo localVariableTypeInfo) - { - localVariableTypeInfo.u2index = - remapVariable(localVariableTypeInfo.u2index); - } - - - // Implementations for TypeAnnotationVisitor. - - public void visitTypeAnnotation(Clazz clazz, TypeAnnotation typeAnnotation) - { - typeAnnotation.targetInfoAccept(clazz, this); - } - - - // Implementations for TargetInfoVisitor. - - public void visitAnyTargetInfo(Clazz clazz, TypeAnnotation typeAnnotation, TargetInfo targetInfo) {} - - - public void visitLocalVariableTargetInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, TypeAnnotation typeAnnotation, LocalVariableTargetInfo localVariableTargetInfo) - { - localVariableTargetInfo.targetElementsAccept(clazz, method, codeAttribute, typeAnnotation, this); - } - - - // Implementations for LocalVariableTargetElementVisitor. - - public void visitLocalVariableTargetElement(Clazz clazz, Method method, CodeAttribute codeAttribute, TypeAnnotation typeAnnotation, LocalVariableTargetInfo localVariableTargetInfo, LocalVariableTargetElement localVariableTargetElement) - { - localVariableTargetElement.u2index = - remapVariable(localVariableTargetElement.u2index); - } - - - // Implementations for InstructionVisitor. - - public void visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, Instruction instruction) {} - - - public void visitVariableInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, VariableInstruction variableInstruction) - { - // Is the new variable index different from the original one? - int oldVariableIndex = variableInstruction.variableIndex; - int newVariableIndex = remapVariable(oldVariableIndex); - if (newVariableIndex != oldVariableIndex) - { - // Replace the instruction. - Instruction replacementInstruction = - new VariableInstruction(variableInstruction.opcode, - newVariableIndex, - variableInstruction.constant); - - codeAttributeEditor.replaceInstruction(offset, replacementInstruction); - } - } - - - // Small utility methods. - - /** - * Returns the new variable index of the given variable. - */ - private int remapVariable(int variableIndex) - { - return variableMap[variableIndex]; - } -} |