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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2013 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.RefConstant;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.instruction.*;
import proguard.classfile.instruction.visitor.InstructionVisitor;
import proguard.classfile.util.SimplifiedVisitor;
/**
* This InstructionVisitor marks all methods that invoke super methods (other
* than initializers) from the instructions that it visits.
*
* @author Eric Lafortune
*/
public class SuperInvocationMarker
extends SimplifiedVisitor
implements InstructionVisitor,
ConstantVisitor
{
private boolean invokesSuperMethods;
// 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)
{
invokesSuperMethods = false;
clazz.constantPoolEntryAccept(constantInstruction.constantIndex, this);
if (invokesSuperMethods)
{
setInvokesSuperMethods(method);
}
}
}
// Implementations for ConstantVisitor.
public void visitAnyMethodrefConstant(Clazz clazz, RefConstant refConstant)
{
invokesSuperMethods =
!clazz.equals(refConstant.referencedClass) &&
!refConstant.getName(clazz).equals(ClassConstants.INTERNAL_METHOD_NAME_INIT);
}
// Small utility methods.
private static void setInvokesSuperMethods(Method method)
{
MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method);
if (info != null)
{
info.setInvokesSuperMethods();
}
}
public static boolean invokesSuperMethods(Method method)
{
MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method);
return info == null || info.invokesSuperMethods();
}
}
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