/*
* [The "BSD licence"]
* Copyright (c) 2010 Ben Gruver (JesusFreke)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.jf.dexlib.Code;
import org.jf.dexlib.*;
import org.jf.dexlib.Util.NumberUtils;
public abstract class InstructionWithReference extends Instruction {
private Item referencedItem;
private ReferenceType referenceType;
protected InstructionWithReference(Opcode opcode, Item referencedItem) {
super(opcode);
this.referencedItem = referencedItem;
this.referenceType = opcode.referenceType;
checkReferenceType();
}
protected InstructionWithReference(Opcode opcode, Item referencedItem, ReferenceType referenceType) {
super(opcode);
this.referencedItem = referencedItem;
this.referenceType = referenceType;
checkReferenceType();
}
protected InstructionWithReference(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
super(opcode);
this.referenceType = readReferenceType(opcode, buffer, bufferIndex);
int itemIndex = getReferencedItemIndex(buffer, bufferIndex);
lookupReferencedItem(dexFile, opcode, itemIndex);
}
protected int getReferencedItemIndex(byte[] buffer, int bufferIndex) {
return NumberUtils.decodeUnsignedShort(buffer, bufferIndex + 2);
}
public ReferenceType getReferenceType() {
return referenceType;
}
public Item getReferencedItem() {
return referencedItem;
}
protected ReferenceType readReferenceType(Opcode opcode, byte[] buffer, int bufferIndex) {
return opcode.referenceType;
}
private void lookupReferencedItem(DexFile dexFile, Opcode opcode, int itemIndex) {
switch (referenceType) {
case field:
referencedItem = dexFile.FieldIdsSection.getItemByIndex(itemIndex);
return;
case method:
referencedItem = dexFile.MethodIdsSection.getItemByIndex(itemIndex);
return;
case type:
referencedItem = dexFile.TypeIdsSection.getItemByIndex(itemIndex);
return;
case string:
referencedItem = dexFile.StringIdsSection.getItemByIndex(itemIndex);
}
}
private void checkReferenceType() {
switch (referenceType) {
case field:
if (!(referencedItem instanceof FieldIdItem)) {
throw new RuntimeException(referencedItem.getClass().getSimpleName() +
" is the wrong item type for opcode " + opcode.name + ". Expecting FieldIdItem.");
}
return;
case method:
if (!(referencedItem instanceof MethodIdItem)) {
throw new RuntimeException(referencedItem.getClass().getSimpleName() +
" is the wrong item type for opcode " + opcode.name + ". Expecting MethodIdItem.");
}
return;
case type:
if (!(referencedItem instanceof TypeIdItem)) {
throw new RuntimeException(referencedItem.getClass().getSimpleName() +
" is the wrong item type for opcode " + opcode.name + ". Expecting TypeIdItem.");
}
return;
case string:
if (!(referencedItem instanceof StringIdItem)) {
throw new RuntimeException(referencedItem.getClass().getSimpleName() +
" is the wrong item type for opcode " + opcode.name + ". Expecting StringIdItem.");
}
return;
default:
if (referencedItem != null) {
throw new RuntimeException(referencedItem.getClass().getSimpleName() +
" is invalid for opcode " + opcode.name + ". This opcode does not reference an item");
}
}
}
}