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/*
* 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.optimize.info;
import proguard.classfile.*;
import proguard.classfile.attribute.CodeAttribute;
import proguard.classfile.constant.*;
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.*;
/**
* This InstructionVisitor marks the types of class accesses and class member
* accesses of the methods whose instructions it visits.
*
* @author Eric Lafortune
*/
public class AccessMethodMarker
extends SimplifiedVisitor
implements InstructionVisitor,
ConstantVisitor,
ClassVisitor,
MemberVisitor
{
private Method invokingMethod;
// 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)
{
invokingMethod = method;
clazz.constantPoolEntryAccept(constantInstruction.constantIndex, this);
}
// Implementations for ConstantVisitor.
public void visitAnyConstant(Clazz clazz, Constant constant) {}
public void visitStringConstant(Clazz clazz, StringConstant stringConstant)
{
// Check the referenced class or class member, if any.
stringConstant.referencedClassAccept(this);
stringConstant.referencedMemberAccept(this);
}
public void visitAnyRefConstant(Clazz clazz, RefConstant refConstant)
{
// Check the referenced class.
clazz.constantPoolEntryAccept(refConstant.u2classIndex, this);
// Check the referenced class member itself.
refConstant.referencedClassAccept(this);
refConstant.referencedMemberAccept(this);
}
public void visitClassConstant(Clazz clazz, ClassConstant classConstant)
{
// Check the referenced class.
classConstant.referencedClassAccept(this);
}
// Implementations for ClassVisitor.
public void visitAnyClass(Clazz clazz)
{
int accessFlags = clazz.getAccessFlags();
if ((accessFlags & ClassConstants.INTERNAL_ACC_PUBLIC) == 0)
{
setAccessesPackageCode(invokingMethod);
}
}
// Implementations for MemberVisitor.
public void visitAnyMember(Clazz clazz, Member member)
{
int accessFlags = member.getAccessFlags();
if ((accessFlags & ClassConstants.INTERNAL_ACC_PRIVATE) != 0)
{
setAccessesPrivateCode(invokingMethod);
}
else if ((accessFlags & ClassConstants.INTERNAL_ACC_PROTECTED) != 0)
{
setAccessesProtectedCode(invokingMethod);
}
else if ((accessFlags & ClassConstants.INTERNAL_ACC_PUBLIC) == 0)
{
setAccessesPackageCode(invokingMethod);
}
}
// Small utility methods.
private static void setAccessesPrivateCode(Method method)
{
MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method);
if (info != null)
{
info.setAccessesPrivateCode();
}
}
/**
* Returns whether the given method accesses private class members.
*/
public static boolean accessesPrivateCode(Method method)
{
MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method);
return info == null || info.accessesPrivateCode();
}
private static void setAccessesPackageCode(Method method)
{
MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method);
if (info != null)
{
info.setAccessesPackageCode();
}
}
/**
* Returns whether the given method accesses package visible classes or class
* members.
*/
public static boolean accessesPackageCode(Method method)
{
MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method);
return info == null || info.accessesPackageCode();
}
private static void setAccessesProtectedCode(Method method)
{
MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method);
if (info != null)
{
info.setAccessesProtectedCode();
}
}
/**
* Returns whether the given method accesses protected class members.
*/
public static boolean accessesProtectedCode(Method method)
{
MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method);
return info == null || info.accessesProtectedCode();
}
}
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