/*
* Copyright 2000-2004 The Apache Software Foundation
*
* 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 org.apache.bcel5_2_0.generic;
import org.apache.bcel5_2_0.Constants;
/**
* Wrapper class for push operations, which are implemented either as BIPUSH,
* LDC or xCONST_n instructions.
*
* @version $Id: PUSH.java 386056 2006-03-15 11:31:56Z tcurdt $
* @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
*/
public final class PUSH implements CompoundInstruction, VariableLengthInstruction,
InstructionConstants {
private Instruction instruction;
/**
* This constructor also applies for values of type short, char, byte
*
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(ConstantPoolGen cp, int value) {
if ((value >= -1) && (value <= 5)) {
instruction = INSTRUCTIONS[Constants.ICONST_0 + value];
} else if ((value >= -128) && (value <= 127)) {
instruction = new BIPUSH((byte) value);
} else if ((value >= -32768) && (value <= 32767)) {
instruction = new SIPUSH((short) value);
} else {
instruction = new LDC(cp.addInteger(value));
}
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(ConstantPoolGen cp, boolean value) {
instruction = INSTRUCTIONS[Constants.ICONST_0 + (value ? 1 : 0)];
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(ConstantPoolGen cp, float value) {
if (value == 0.0) {
instruction = FCONST_0;
} else if (value == 1.0) {
instruction = FCONST_1;
} else if (value == 2.0) {
instruction = FCONST_2;
} else {
instruction = new LDC(cp.addFloat(value));
}
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(ConstantPoolGen cp, long value) {
if (value == 0) {
instruction = LCONST_0;
} else if (value == 1) {
instruction = LCONST_1;
} else {
instruction = new LDC2_W(cp.addLong(value));
}
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(ConstantPoolGen cp, double value) {
if (value == 0.0) {
instruction = DCONST_0;
} else if (value == 1.0) {
instruction = DCONST_1;
} else {
instruction = new LDC2_W(cp.addDouble(value));
}
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(ConstantPoolGen cp, String value) {
if (value == null) {
instruction = ACONST_NULL;
} else {
instruction = new LDC(cp.addString(value));
}
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(ConstantPoolGen cp, Number value) {
if ((value instanceof Integer) || (value instanceof Short) || (value instanceof Byte)) {
instruction = new PUSH(cp, value.intValue()).instruction;
} else if (value instanceof Double) {
instruction = new PUSH(cp, value.doubleValue()).instruction;
} else if (value instanceof Float) {
instruction = new PUSH(cp, value.floatValue()).instruction;
} else if (value instanceof Long) {
instruction = new PUSH(cp, value.longValue()).instruction;
} else {
throw new ClassGenException("What's this: " + value);
}
}
/**
* creates a push object from a Character value. Warning: Make sure not to attempt to allow
* autoboxing to create this value parameter, as an alternative constructor will be called
*
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(ConstantPoolGen cp, Character value) {
this(cp, value.charValue());
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(ConstantPoolGen cp, Boolean value) {
this(cp, value.booleanValue());
}
public final InstructionList getInstructionList() {
return new InstructionList(instruction);
}
public final Instruction getInstruction() {
return instruction;
}
/**
* @return mnemonic for instruction
*/
public String toString() {
return instruction.toString() + " (PUSH)";
}
}