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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.classfile.util;
import proguard.classfile.*;
import proguard.classfile.visitor.*;
/**
* This MemberVisitor lets a given parameter visitor visit all the parameters
* of the methods that it visits. The parameters do not include or count the
* 'this' parameter or the return value.
*
* @author Eric Lafortune
*/
public class AllParameterVisitor
implements MemberVisitor
{
private final ParameterVisitor parameterVisitor;
/**
* Creates a new AllParameterVisitor for the given parameter
* visitor.
*/
public AllParameterVisitor(ParameterVisitor parameterVisitor)
{
this.parameterVisitor = parameterVisitor;
}
// Implementations for MemberVisitor.
public void visitProgramField(ProgramClass programClass, ProgramField programField)
{
visitFieldType(programClass,
programField,
programField.referencedClass);
}
public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField)
{
visitFieldType(libraryClass,
libraryField,
libraryField.referencedClass);
}
public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
{
visitParameters(programClass,
programMethod,
programMethod.referencedClasses);
}
public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
{
visitParameters(libraryClass,
libraryMethod,
libraryMethod.referencedClasses);
}
// Small utility methods.
/**
* Lets the parameter visitor visit the type of the given field.
*/
private void visitFieldType(Clazz clazz,
Field field,
Clazz referencedClass)
{
String descriptor = field.getDescriptor(clazz);
parameterVisitor.visitParameter(clazz,
field,
0,
1,
0,
ClassUtil.internalTypeSize(descriptor),
descriptor,
referencedClass);
}
/**
* Lets the parameter visitor visit the parameters of the given method.
*/
private void visitParameters(Clazz clazz,
Method method,
Clazz[] referencedClasses)
{
String descriptor = method.getDescriptor(clazz);
// Count the number of parameters and their total size.
int parameterCount = 0;
int parameterSize = 0;
int index = 1;
loop: while (true)
{
char c = descriptor.charAt(index++);
switch (c)
{
case ClassConstants.TYPE_LONG:
case ClassConstants.TYPE_DOUBLE:
{
// Long and double primitive types.
parameterSize++;
break;
}
default:
{
// All other primitive types.
break;
}
case ClassConstants.TYPE_CLASS_START:
{
// Class types.
// Skip the class name.
index = descriptor.indexOf(ClassConstants.TYPE_CLASS_END, index) + 1;
break;
}
case ClassConstants.TYPE_ARRAY:
{
// Array types.
// Skip all array characters.
while ((c = descriptor.charAt(index++)) == ClassConstants.TYPE_ARRAY) {}
if (c == ClassConstants.TYPE_CLASS_START)
{
// Skip the class type.
index = descriptor.indexOf(ClassConstants.TYPE_CLASS_END, index) + 1;
}
break;
}
case ClassConstants.METHOD_ARGUMENTS_CLOSE:
{
break loop;
}
}
parameterCount++;
parameterSize++;
}
// Visit the parameters.
int parameterIndex = 0;
int parameterOffset = 0;
int referenceClassIndex = 0;
index = 1;
while (true)
{
int newIndex = index + 1;
int thisParameterSize = 1;
Clazz referencedClass = null;
char c = descriptor.charAt(index);
switch (c)
{
case ClassConstants.TYPE_LONG:
case ClassConstants.TYPE_DOUBLE:
{
// Long and double primitive types.
thisParameterSize = 2;
break;
}
default:
{
// All other primitive types.
break;
}
case ClassConstants.TYPE_CLASS_START:
{
// Class types.
// Skip the class name.
newIndex = descriptor.indexOf(ClassConstants.TYPE_CLASS_END, newIndex) + 1;
referencedClass = referencedClasses == null ? null :
referencedClasses[referenceClassIndex++];
break;
}
case ClassConstants.TYPE_ARRAY:
{
// Array types.
// Skip all array characters.
while ((c = descriptor.charAt(newIndex++)) == ClassConstants.TYPE_ARRAY) {}
if (c == ClassConstants.TYPE_CLASS_START)
{
// Skip the class type.
newIndex = descriptor.indexOf(ClassConstants.TYPE_CLASS_END, newIndex) + 1;
referencedClass = referencedClasses == null ? null :
referencedClasses[referenceClassIndex++];
}
break;
}
case ClassConstants.METHOD_ARGUMENTS_CLOSE:
{
// End of the method parameters.
return;
}
}
parameterVisitor.visitParameter(clazz,
method,
parameterIndex++,
parameterCount,
parameterOffset,
parameterSize,
descriptor.substring(index, newIndex),
referencedClass);
// Continue with the next parameter.
index = newIndex;
parameterOffset += thisParameterSize;
}
}
}
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