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/*
* 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;
import proguard.classfile.*;
import proguard.classfile.attribute.*;
import proguard.classfile.attribute.visitor.AttributeVisitor;
import proguard.classfile.constant.*;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.editor.CodeAttributeEditor;
import proguard.classfile.instruction.*;
import proguard.classfile.instruction.visitor.InstructionVisitor;
import proguard.classfile.util.*;
import proguard.classfile.visitor.MemberVisitor;
/**
* This AttributeVisitor adds an additional integer parameter to the tweaked
* initialization method invocations that it visits.
*/
public class DuplicateInitializerInvocationFixer
extends SimplifiedVisitor
implements AttributeVisitor,
InstructionVisitor,
ConstantVisitor,
MemberVisitor
{
private static final boolean DEBUG = false;
private final InstructionVisitor extraAddedInstructionVisitor;
private final CodeAttributeEditor codeAttributeEditor = new CodeAttributeEditor();
private String descriptor;
private int descriptorLengthDelta;
/**
* Creates a new DuplicateInitializerInvocationFixer.
*/
public DuplicateInitializerInvocationFixer()
{
this(null);
}
/**
* Creates a new DuplicateInitializerInvocationFixer.
* @param extraAddedInstructionVisitor an optional extra visitor for all
* added instructions.
*/
public DuplicateInitializerInvocationFixer(InstructionVisitor extraAddedInstructionVisitor)
{
this.extraAddedInstructionVisitor = extraAddedInstructionVisitor;
}
// Implementations for AttributeVisitor.
public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}
public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)
{
// Reset the code changes.
codeAttributeEditor.reset(codeAttribute.u4codeLength);
// Fix any duplicate constructor invocations.
codeAttribute.instructionsAccept(clazz,
method,
this);
// Apply all accumulated changes to the code.
codeAttributeEditor.visitCodeAttribute(clazz, method, codeAttribute);
}
// Implementations for InstructionVisitor.
public void visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, Instruction instruction) {}
public void visitConstantInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, ConstantInstruction constantInstruction)
{
if (constantInstruction.opcode == InstructionConstants.OP_INVOKESPECIAL)
{
descriptorLengthDelta = 0;
clazz.constantPoolEntryAccept(constantInstruction.constantIndex, this);
if (descriptorLengthDelta > 0)
{
Instruction extraInstruction =
new SimpleInstruction(descriptorLengthDelta == 1 ?
InstructionConstants.OP_ICONST_0 :
InstructionConstants.OP_ACONST_NULL);
codeAttributeEditor.insertBeforeInstruction(offset,
extraInstruction);
if (DEBUG)
{
System.out.println(" ["+clazz.getName()+"."+method.getName(clazz)+method.getDescriptor(clazz)+"] Inserting "+extraInstruction.toString()+" before "+constantInstruction.toString(offset));
}
if (extraAddedInstructionVisitor != null)
{
extraInstruction.accept(null, null, null, offset, extraAddedInstructionVisitor);
}
}
}
}
// Implementations for ConstantVisitor.
public void visitAnyMethodrefConstant(Clazz clazz, RefConstant refConstant)
{
// Check the referenced constructor descriptor.
if (refConstant.getName(clazz).equals(ClassConstants.METHOD_NAME_INIT))
{
descriptor = refConstant.getType(clazz);
refConstant.referencedMemberAccept(this);
}
}
// Implementations for MemberVisitor.
public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod) {}
public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
{
descriptorLengthDelta =
programMethod.getDescriptor(programClass).length() - descriptor.length();
if (DEBUG)
{
if (descriptorLengthDelta > 0)
{
System.out.println("DuplicateInitializerInvocationFixer:");
System.out.println(" ["+programClass.getName()+"."+programMethod.getName(programClass)+programMethod.getDescriptor(programClass)+"] ("+ClassUtil.externalClassAccessFlags(programMethod.getAccessFlags())+") referenced by:");
}
}
}
}
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