proguard.classfile.editor.BridgeMethodFixer Maven / Gradle / Ivy
/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2018 GuardSquare NV
*
* 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.visitor.AttributeVisitor;
import proguard.classfile.constant.RefConstant;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.instruction.*;
import proguard.classfile.instruction.visitor.InstructionVisitor;
import proguard.classfile.util.SimplifiedVisitor;
import proguard.classfile.visitor.MemberVisitor;
/**
* This MemberVisitor fixes all inappropriate bridge access flags of the
* program methods that it visits, checking whether the methods to which they
* bridge have the same name. Some compilers, like in Eclipse and in later
* versions of JDK 1.6, complain if they can't find the method with the same
* name.
*
* @author Eric Lafortune
*/
public class BridgeMethodFixer
extends SimplifiedVisitor
implements MemberVisitor,
AttributeVisitor,
InstructionVisitor,
ConstantVisitor
{
private static final boolean DEBUG = false;
// Return values for the visitor methods.
private String bridgedMethodName;
// Implementations for MemberVisitor.
public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
{
if ((programMethod.getAccessFlags() & ClassConstants.ACC_BRIDGE) != 0)
{
programMethod.attributesAccept(programClass, this);
}
}
// Implementations for AttributeVisitor.
public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}
public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)
{
// Go over the instructions of the bridge method.
codeAttribute.instructionsAccept(clazz, method, this);
}
// 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)
{
switch (constantInstruction.opcode)
{
case InstructionConstants.OP_INVOKEVIRTUAL:
case InstructionConstants.OP_INVOKESPECIAL:
case InstructionConstants.OP_INVOKESTATIC:
case InstructionConstants.OP_INVOKEINTERFACE:
// Get the name of the bridged method.
clazz.constantPoolEntryAccept(constantInstruction.constantIndex, this);
// Check if the name is different.
if (!method.getName(clazz).equals(bridgedMethodName))
{
if (DEBUG)
{
System.out.println("BridgeMethodFixer: ["+clazz.getName()+"."+method.getName(clazz)+method.getDescriptor(clazz)+"] does not bridge to ["+bridgedMethodName+"]");
}
// Clear the bridge flag.
((ProgramMethod)method).u2accessFlags &= ~ClassConstants.ACC_BRIDGE;
}
break;
}
}
// Implementations for ConstantVisitor.
public void visitAnyMethodrefConstant(Clazz clazz, RefConstant refConstant)
{
bridgedMethodName = refConstant.getName(clazz);
}
}
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