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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.bcel.generic;
import org.apache.bcel.Const;
/**
* Wrapper class for push operations, which are implemented either as BIPUSH,
* LDC or xCONST_n instructions.
*
* @version $Id$
*/
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(final ConstantPoolGen cp, final int value) {
if ((value >= -1) && (value <= 5)) {
instruction = InstructionConst.getInstruction(Const.ICONST_0 + value);
} else if (Instruction.isValidByte(value)) {
instruction = new BIPUSH((byte) value);
} else if (Instruction.isValidShort(value)) {
instruction = new SIPUSH((short) value);
} else {
instruction = new LDC(cp.addInteger(value));
}
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(final ConstantPoolGen cp, final boolean value) {
instruction = InstructionConst.getInstruction(Const.ICONST_0 + (value ? 1 : 0));
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(final ConstantPoolGen cp, final float value) {
if (value == 0.0) {
instruction = InstructionConst.FCONST_0;
} else if (value == 1.0) {
instruction = InstructionConst.FCONST_1;
} else if (value == 2.0) {
instruction = InstructionConst.FCONST_2;
} else {
instruction = new LDC(cp.addFloat(value));
}
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(final ConstantPoolGen cp, final long value) {
if (value == 0) {
instruction = InstructionConst.LCONST_0;
} else if (value == 1) {
instruction = InstructionConst.LCONST_1;
} else {
instruction = new LDC2_W(cp.addLong(value));
}
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(final ConstantPoolGen cp, final double value) {
if (value == 0.0) {
instruction = InstructionConst.DCONST_0;
} else if (value == 1.0) {
instruction = InstructionConst.DCONST_1;
} else {
instruction = new LDC2_W(cp.addDouble(value));
}
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(final ConstantPoolGen cp, final String value) {
if (value == null) {
instruction = InstructionConst.ACONST_NULL;
} else {
instruction = new LDC(cp.addString(value));
}
}
/**
*
* @param cp
* @param value
* @since 6.0
*/
public PUSH(final ConstantPoolGen cp, final ObjectType value) {
if (value == null) {
instruction = InstructionConst.ACONST_NULL;
} else {
instruction = new LDC(cp.addClass(value));
}
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(final ConstantPoolGen cp, final 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(final ConstantPoolGen cp, final Character value) {
this(cp, value.charValue());
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(final ConstantPoolGen cp, final Boolean value) {
this(cp, value.booleanValue());
}
@Override
public final InstructionList getInstructionList() {
return new InstructionList(instruction);
}
public final Instruction getInstruction() {
return instruction;
}
/**
* @return mnemonic for instruction
*/
@Override
public String toString() {
return instruction + " (PUSH)";
}
}
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