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Diffstat (limited to 'src/proguard/classfile/editor/ConstantPoolEditor.java')
| -rw-r--r-- | src/proguard/classfile/editor/ConstantPoolEditor.java | 665 |
1 files changed, 665 insertions, 0 deletions
diff --git a/src/proguard/classfile/editor/ConstantPoolEditor.java b/src/proguard/classfile/editor/ConstantPoolEditor.java new file mode 100644 index 0000000..8663dee --- /dev/null +++ b/src/proguard/classfile/editor/ConstantPoolEditor.java @@ -0,0 +1,665 @@ +/* + * 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.editor; + +import proguard.classfile.*; +import proguard.classfile.constant.*; + +/** + * This class can add constant pool entries to a given class. + * + * @author Eric Lafortune + */ +public class ConstantPoolEditor +{ + private static final boolean DEBUG = false; + + private ProgramClass targetClass; + + + /** + * Creates a new ConstantPoolEditor that will edit constants in the given + * target class. + */ + public ConstantPoolEditor(ProgramClass targetClass) + { + this.targetClass = targetClass; + } + + + /** + * Finds or creates a IntegerConstant constant pool entry with the given + * value. + * @return the constant pool index of the Utf8Constant. + */ + public int addIntegerConstant(int value) + { + int constantPoolCount = targetClass.u2constantPoolCount; + Constant[] constantPool = targetClass.constantPool; + + // Check if the entry already exists. + for (int index = 1; index < constantPoolCount; index++) + { + Constant constant = constantPool[index]; + + if (constant != null && + constant.getTag() == ClassConstants.CONSTANT_Integer) + { + IntegerConstant integerConstant = (IntegerConstant)constant; + if (integerConstant.getValue() == value) + { + return index; + } + } + } + + return addConstant(new IntegerConstant(value)); + } + + + /** + * Finds or creates a LongConstant constant pool entry with the given value. + * @return the constant pool index of the LongConstant. + */ + public int addLongConstant(long value) + { + int constantPoolCount = targetClass.u2constantPoolCount; + Constant[] constantPool = targetClass.constantPool; + + // Check if the entry already exists. + for (int index = 1; index < constantPoolCount; index++) + { + Constant constant = constantPool[index]; + + if (constant != null && + constant.getTag() == ClassConstants.CONSTANT_Long) + { + LongConstant longConstant = (LongConstant)constant; + if (longConstant.getValue() == value) + { + return index; + } + } + } + + return addConstant(new LongConstant(value)); + } + + + /** + * Finds or creates a FloatConstant constant pool entry with the given + * value. + * @return the constant pool index of the FloatConstant. + */ + public int addFloatConstant(float value) + { + int constantPoolCount = targetClass.u2constantPoolCount; + Constant[] constantPool = targetClass.constantPool; + + // Check if the entry already exists. + for (int index = 1; index < constantPoolCount; index++) + { + Constant constant = constantPool[index]; + + if (constant != null && + constant.getTag() == ClassConstants.CONSTANT_Float) + { + FloatConstant floatConstant = (FloatConstant)constant; + if (floatConstant.getValue() == value) + { + return index; + } + } + } + + return addConstant(new FloatConstant(value)); + } + + + /** + * Finds or creates a DoubleConstant constant pool entry with the given + * value. + * @return the constant pool index of the DoubleConstant. + */ + public int addDoubleConstant(double value) + { + int constantPoolCount = targetClass.u2constantPoolCount; + Constant[] constantPool = targetClass.constantPool; + + // Check if the entry already exists. + for (int index = 1; index < constantPoolCount; index++) + { + Constant constant = constantPool[index]; + + if (constant != null && + constant.getTag() == ClassConstants.CONSTANT_Double) + { + DoubleConstant doubleConstant = (DoubleConstant)constant; + if (doubleConstant.getValue() == value) + { + return index; + } + } + } + + return addConstant(new DoubleConstant(value)); + } + + + /** + * Finds or creates a StringConstant constant pool entry with the given + * value. + * @return the constant pool index of the StringConstant. + */ + public int addStringConstant(String string, + Clazz referencedClass, + Member referencedMember) + { + int constantPoolCount = targetClass.u2constantPoolCount; + Constant[] constantPool = targetClass.constantPool; + + // Check if the entry already exists. + for (int index = 1; index < constantPoolCount; index++) + { + Constant constant = constantPool[index]; + + if (constant != null && + constant.getTag() == ClassConstants.CONSTANT_String) + { + StringConstant stringConstant = (StringConstant)constant; + if (stringConstant.getString(targetClass).equals(string)) + { + return index; + } + } + } + + return addConstant(new StringConstant(addUtf8Constant(string), + referencedClass, + referencedMember)); + } + + + /** + * Finds or creates a FieldrefConstant constant pool entry for the given + * class and field. + * @return the constant pool index of the FieldrefConstant. + */ + public int addFieldrefConstant(Clazz referencedClass, + Member referencedMember) + { + return addFieldrefConstant(referencedClass.getName(), + referencedMember.getName(referencedClass), + referencedMember.getDescriptor(referencedClass), + referencedClass, + referencedMember); + } + + + /** + * Finds or creates a FieldrefConstant constant pool entry with the given + * class name, field name, and descriptor. + * @return the constant pool index of the FieldrefConstant. + */ + public int addFieldrefConstant(String className, + String name, + String descriptor, + Clazz referencedClass, + Member referencedMember) + { + return addFieldrefConstant(className, + addNameAndTypeConstant(name, descriptor), + referencedClass, + referencedMember); + } + + + /** + * Finds or creates a FieldrefConstant constant pool entry with the given + * class name, field name, and descriptor. + * @return the constant pool index of the FieldrefConstant. + */ + public int addFieldrefConstant(String className, + int nameAndTypeIndex, + Clazz referencedClass, + Member referencedMember) + { + return addFieldrefConstant(addClassConstant(className, referencedClass), + nameAndTypeIndex, + referencedClass, + referencedMember); + } + + + /** + * Finds or creates a FieldrefConstant constant pool entry with the given + * class constant pool entry index, field name, and descriptor. + * @return the constant pool index of the FieldrefConstant. + */ + public int addFieldrefConstant(int classIndex, + String name, + String descriptor, + Clazz referencedClass, + Member referencedMember) + { + return addFieldrefConstant(classIndex, + addNameAndTypeConstant(name, descriptor), + referencedClass, + referencedMember); + } + + + /** + * Finds or creates a FieldrefConstant constant pool entry with the given + * class constant pool entry index and name and type constant pool entry + * index. + * @return the constant pool index of the FieldrefConstant. + */ + public int addFieldrefConstant(int classIndex, + int nameAndTypeIndex, + Clazz referencedClass, + Member referencedMember) + { + int constantPoolCount = targetClass.u2constantPoolCount; + Constant[] constantPool = targetClass.constantPool; + + // Check if the entry already exists. + for (int index = 1; index < constantPoolCount; index++) + { + Constant constant = constantPool[index]; + + if (constant != null && + constant.getTag() == ClassConstants.CONSTANT_Fieldref) + { + FieldrefConstant fieldrefConstant = (FieldrefConstant)constant; + if (fieldrefConstant.u2classIndex == classIndex && + fieldrefConstant.u2nameAndTypeIndex == nameAndTypeIndex) + { + return index; + } + } + } + + return addConstant(new FieldrefConstant(classIndex, + nameAndTypeIndex, + referencedClass, + referencedMember)); + } + + + /** + * Finds or creates a InterfaceMethodrefConstant constant pool entry with the + * given class name, method name, and descriptor. + * @return the constant pool index of the InterfaceMethodrefConstant. + */ + public int addInterfaceMethodrefConstant(String className, + String name, + String descriptor, + Clazz referencedClass, + Member referencedMember) + { + return addInterfaceMethodrefConstant(className, + addNameAndTypeConstant(name, descriptor), + referencedClass, + referencedMember); + } + + + /** + * Finds or creates a InterfaceMethodrefConstant constant pool entry with the + * given class name, method name, and descriptor. + * @return the constant pool index of the InterfaceMethodrefConstant. + */ + public int addInterfaceMethodrefConstant(String className, + int nameAndTypeIndex, + Clazz referencedClass, + Member referencedMember) + { + return addInterfaceMethodrefConstant(addClassConstant(className, referencedClass), + nameAndTypeIndex, + referencedClass, + referencedMember); + } + + + /** + * Finds or creates a InterfaceMethodrefConstant constant pool entry for the + * given class and method. + * @return the constant pool index of the InterfaceMethodrefConstant. + */ + public int addInterfaceMethodrefConstant(Clazz referencedClass, + Member referencedMember) + { + return addInterfaceMethodrefConstant(referencedClass.getName(), + referencedMember.getName(referencedClass), + referencedMember.getDescriptor(referencedClass), + referencedClass, + referencedMember); + } + + + /** + * Finds or creates a InterfaceMethodrefConstant constant pool entry with the + * given class constant pool entry index, method name, and descriptor. + * @return the constant pool index of the InterfaceMethodrefConstant. + */ + public int addInterfaceMethodrefConstant(int classIndex, + String name, + String descriptor, + Clazz referencedClass, + Member referencedMember) + { + return addInterfaceMethodrefConstant(classIndex, + addNameAndTypeConstant(name, descriptor), + referencedClass, + referencedMember); + } + + + /** + * Finds or creates a InterfaceMethodrefConstant constant pool entry with the + * given class constant pool entry index and name and type constant pool + * entry index. + * @return the constant pool index of the InterfaceMethodrefConstant. + */ + public int addInterfaceMethodrefConstant(int classIndex, + int nameAndTypeIndex, + Clazz referencedClass, + Member referencedMember) + { + int constantPoolCount = targetClass.u2constantPoolCount; + Constant[] constantPool = targetClass.constantPool; + + // Check if the entry already exists. + for (int index = 1; index < constantPoolCount; index++) + { + Constant constant = constantPool[index]; + + if (constant != null && + constant.getTag() == ClassConstants.CONSTANT_InterfaceMethodref) + { + InterfaceMethodrefConstant methodrefConstant = (InterfaceMethodrefConstant)constant; + if (methodrefConstant.u2classIndex == classIndex && + methodrefConstant.u2nameAndTypeIndex == nameAndTypeIndex) + { + return index; + } + } + } + + return addConstant(new InterfaceMethodrefConstant(classIndex, + nameAndTypeIndex, + referencedClass, + referencedMember)); + } + + + /** + * Finds or creates a MethodrefConstant constant pool entry for the given + * class and method. + * @return the constant pool index of the MethodrefConstant. + */ + public int addMethodrefConstant(Clazz referencedClass, + Member referencedMember) + { + return addMethodrefConstant(referencedClass.getName(), + referencedMember.getName(referencedClass), + referencedMember.getDescriptor(referencedClass), + referencedClass, + referencedMember); + } + + + /** + * Finds or creates a MethodrefConstant constant pool entry with the given + * class name, method name, and descriptor. + * @return the constant pool index of the MethodrefConstant. + */ + public int addMethodrefConstant(String className, + String name, + String descriptor, + Clazz referencedClass, + Member referencedMember) + { + return addMethodrefConstant(className, + addNameAndTypeConstant(name, descriptor), + referencedClass, + referencedMember); + } + + + /** + * Finds or creates a MethodrefConstant constant pool entry with the given + * class name, method name, and descriptor. + * @return the constant pool index of the MethodrefConstant. + */ + public int addMethodrefConstant(String className, + int nameAndTypeIndex, + Clazz referencedClass, + Member referencedMember) + { + return addMethodrefConstant(addClassConstant(className, referencedClass), + nameAndTypeIndex, + referencedClass, + referencedMember); + } + + + /** + * Finds or creates a MethodrefConstant constant pool entry with the given + * class constant pool entry index, method name, and descriptor. + * @return the constant pool index of the MethodrefConstant. + */ + public int addMethodrefConstant(int classIndex, + String name, + String descriptor, + Clazz referencedClass, + Member referencedMember) + { + return addMethodrefConstant(classIndex, + addNameAndTypeConstant(name, descriptor), + referencedClass, + referencedMember); + } + + + /** + * Finds or creates a MethodrefConstant constant pool entry with the given + * class constant pool entry index and name and type constant pool entry + * index. + * @return the constant pool index of the MethodrefConstant. + */ + public int addMethodrefConstant(int classIndex, + int nameAndTypeIndex, + Clazz referencedClass, + Member referencedMember) + { + int constantPoolCount = targetClass.u2constantPoolCount; + Constant[] constantPool = targetClass.constantPool; + + // Check if the entry already exists. + for (int index = 1; index < constantPoolCount; index++) + { + Constant constant = constantPool[index]; + + if (constant != null && + constant.getTag() == ClassConstants.CONSTANT_Methodref) + { + MethodrefConstant methodrefConstant = (MethodrefConstant)constant; + if (methodrefConstant.u2classIndex == classIndex && + methodrefConstant.u2nameAndTypeIndex == nameAndTypeIndex) + { + return index; + } + } + } + + return addConstant(new MethodrefConstant(classIndex, + nameAndTypeIndex, + referencedClass, + referencedMember)); + } + + + /** + * Finds or creates a ClassConstant constant pool entry for the given class. + * @return the constant pool index of the ClassConstant. + */ + public int addClassConstant(Clazz referencedClass) + { + return addClassConstant(referencedClass.getName(), + referencedClass); + } + + + /** + * Finds or creates a ClassConstant constant pool entry with the given name. + * @return the constant pool index of the ClassConstant. + */ + public int addClassConstant(String name, + Clazz referencedClass) + { + int constantPoolCount = targetClass.u2constantPoolCount; + Constant[] constantPool = targetClass.constantPool; + + // Check if the entry already exists. + for (int index = 1; index < constantPoolCount; index++) + { + Constant constant = constantPool[index]; + + if (constant != null && + constant.getTag() == ClassConstants.CONSTANT_Class) + { + ClassConstant classConstant = (ClassConstant)constant; + if (classConstant.getName(targetClass).equals(name)) + { + return index; + } + } + } + + int nameIndex = addUtf8Constant(name); + + return addConstant(new ClassConstant(nameIndex, referencedClass)); + } + + + /** + * Finds or creates a NameAndTypeConstant constant pool entry with the given + * name and type. + * @return the constant pool index of the NameAndTypeConstant. + */ + public int addNameAndTypeConstant(String name, + String type) + { + int constantPoolCount = targetClass.u2constantPoolCount; + Constant[] constantPool = targetClass.constantPool; + + // Check if the entry already exists. + for (int index = 1; index < constantPoolCount; index++) + { + Constant constant = constantPool[index]; + + if (constant != null && + constant.getTag() == ClassConstants.CONSTANT_NameAndType) + { + NameAndTypeConstant nameAndTypeConstant = (NameAndTypeConstant)constant; + if (nameAndTypeConstant.getName(targetClass).equals(name) && + nameAndTypeConstant.getType(targetClass).equals(type)) + { + return index; + } + } + } + + return addConstant(new NameAndTypeConstant(addUtf8Constant(name), + addUtf8Constant(type))); + } + + + /** + * Finds or creates a Utf8Constant constant pool entry for the given string. + * @return the constant pool index of the Utf8Constant. + */ + public int addUtf8Constant(String string) + { + int constantPoolCount = targetClass.u2constantPoolCount; + Constant[] constantPool = targetClass.constantPool; + + // Check if the entry already exists. + for (int index = 1; index < constantPoolCount; index++) + { + Constant constant = constantPool[index]; + + if (constant != null && + constant.getTag() == ClassConstants.CONSTANT_Utf8) + { + Utf8Constant utf8Constant = (Utf8Constant)constant; + if (utf8Constant.getString().equals(string)) + { + return index; + } + } + } + + return addConstant(new Utf8Constant(string)); + } + + + /** + * Adds a given constant pool entry to the end of the constant pool/ + * @return the constant pool index for the added entry. + */ + public int addConstant(Constant constant) + { + int constantPoolCount = targetClass.u2constantPoolCount; + Constant[] constantPool = targetClass.constantPool; + + // Make sure there is enough space for another constant pool entry. + if (constantPool.length < constantPoolCount+2) + { + targetClass.constantPool = new Constant[constantPoolCount+2]; + System.arraycopy(constantPool, 0, + targetClass.constantPool, 0, + constantPoolCount); + constantPool = targetClass.constantPool; + } + + if (DEBUG) + { + System.out.println(targetClass.getName()+": adding ["+constant.getClass().getName()+"] at index "+targetClass.u2constantPoolCount); + } + + // Create a new Utf8Constant for the given string. + constantPool[targetClass.u2constantPoolCount++] = constant; + + // Long constants and double constants take up two entries in the + // constant pool. + int tag = constant.getTag(); + if (tag == ClassConstants.CONSTANT_Long || + tag == ClassConstants.CONSTANT_Double) + { + constantPool[targetClass.u2constantPoolCount++] = null; + } + + return constantPoolCount; + } +} |