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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.dx.dex.code;
/**
* Representation of an opcode.
*/
public final class Dop {
/** DalvOps.MIN_VALUE..DalvOps.MAX_VALUE; the opcode value itself */
private final int opcode;
/** DalvOps.MIN_VALUE..DalvOps.MAX_VALUE; the opcode family */
private final int family;
/** non-null; the instruction format */
private final InsnFormat format;
/** whether this opcode uses a result register */
private final boolean hasResult;
/** non-null; the name */
private final String name;
/**
* Constructs an instance.
*
* @param opcode DalvOps.MIN_VALUE..DalvOps.MAX_VALUE; the opcode
* value itself
* @param family DalvOps.MIN_VALUE..DalvOps.MAX_VALUE; the opcode family
* @param format non-null; the instruction format
* @param hasResult whether the opcode has a result register; if so it
* is always the first register
* @param name non-null; the name
*/
public Dop(int opcode, int family, InsnFormat format,
boolean hasResult, String name) {
if ((opcode < DalvOps.MIN_VALUE) || (opcode > DalvOps.MAX_VALUE)) {
throw new IllegalArgumentException("bogus opcode");
}
if ((family < DalvOps.MIN_VALUE) || (family > DalvOps.MAX_VALUE)) {
throw new IllegalArgumentException("bogus family");
}
if (format == null) {
throw new NullPointerException("format == null");
}
if (name == null) {
throw new NullPointerException("name == null");
}
this.opcode = opcode;
this.family = family;
this.format = format;
this.hasResult = hasResult;
this.name = name;
}
/** {@inheritDoc} */
@Override
public String toString() {
return name;
}
/**
* Gets the opcode value.
*
* @return DalvOps.MIN_VALUE..DalvOps.MAX_VALUE; the opcode value
*/
public int getOpcode() {
return opcode;
}
/**
* Gets the opcode family. The opcode family is the unmarked (no
* "/...") opcode that has equivalent semantics to this one.
*
* @return DalvOps.MIN_VALUE..DalvOps.MAX_VALUE; the opcode family
*/
public int getFamily() {
return family;
}
/**
* Gets the instruction format.
*
* @return non-null; the instruction format
*/
public InsnFormat getFormat() {
return format;
}
/**
* Returns whether this opcode uses a result register.
*
* @return <code>true</code> iff this opcode uses a result register
*/
public boolean hasResult() {
return hasResult;
}
/**
* Gets the opcode name.
*
* @return non-null; the opcode name
*/
public String getName() {
return name;
}
/**
* Gets the opcode for the opposite test of this instance. This is only
* valid for opcodes which are in fact tests.
*
* @return non-null; the opposite test
*/
public Dop getOppositeTest() {
switch (opcode) {
case DalvOps.IF_EQ: return Dops.IF_NE;
case DalvOps.IF_NE: return Dops.IF_EQ;
case DalvOps.IF_LT: return Dops.IF_GE;
case DalvOps.IF_GE: return Dops.IF_LT;
case DalvOps.IF_GT: return Dops.IF_LE;
case DalvOps.IF_LE: return Dops.IF_GT;
case DalvOps.IF_EQZ: return Dops.IF_NEZ;
case DalvOps.IF_NEZ: return Dops.IF_EQZ;
case DalvOps.IF_LTZ: return Dops.IF_GEZ;
case DalvOps.IF_GEZ: return Dops.IF_LTZ;
case DalvOps.IF_GTZ: return Dops.IF_LEZ;
case DalvOps.IF_LEZ: return Dops.IF_GTZ;
}
throw new IllegalArgumentException("bogus opcode: " + this);
}
}
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