/*
* [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.Format;
import org.jf.dexlib.Code.Instruction;
import org.jf.dexlib.Code.OffsetInstruction;
import org.jf.dexlib.Code.Opcode;
import org.jf.dexlib.Code.TwoRegisterInstruction;
import org.jf.dexlib.DexFile;
import org.jf.dexlib.Util.AnnotatedOutput;
import org.jf.dexlib.Util.NumberUtils;
public class Instruction22t extends OffsetInstruction implements TwoRegisterInstruction {
public static final Instruction.InstructionFactory Factory = new Factory();
private byte regA;
private byte regB;
private short targetAddressOffset;
public Instruction22t(Opcode opcode, byte regA, byte regB, short offC) {
super(opcode);
if (regA >= 16 ||
regB >= 16) {
throw new RuntimeException("The register number must be less than v16");
}
if (offC == 0) {
throw new RuntimeException("The address offset cannot be 0.");
}
this.regA = regA;
this.regB = regB;
this.targetAddressOffset = offC;
}
private Instruction22t(Opcode opcode, byte[] buffer, int bufferIndex) {
super(opcode);
assert buffer[bufferIndex] == opcode.value;
regA = NumberUtils.decodeLowUnsignedNibble(buffer[bufferIndex + 1]);
regB = NumberUtils.decodeHighUnsignedNibble(buffer[bufferIndex + 1]);
targetAddressOffset = NumberUtils.decodeShort(buffer, bufferIndex + 2);
assert targetAddressOffset != 0;
}
protected void writeInstruction(AnnotatedOutput out, int currentCodeAddress) {
out.writeByte(opcode.value);
out.writeByte((regB << 4) | regA);
out.writeShort(targetAddressOffset);
}
public void updateTargetAddressOffset(int targetAddressOffset) {
if (targetAddressOffset < -32768 || targetAddressOffset > 32767) {
throw new RuntimeException("The address offset " + targetAddressOffset +
" is out of range. It must be in [-32768, 32767]");
}
if (targetAddressOffset == 0) {
throw new RuntimeException("The address offset cannot be 0");
}
this.targetAddressOffset = (short)targetAddressOffset;
}
public Format getFormat() {
return Format.Format22t;
}
public int getRegisterA() {
return regA;
}
public int getRegisterB() {
return regB;
}
public int getTargetAddressOffset() {
return targetAddressOffset;
}
private static class Factory implements Instruction.InstructionFactory {
public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
return new Instruction22t(opcode, buffer, bufferIndex);
}
}
}