/*
* reserved comment block
* DO NOT REMOVE OR ALTER!
*/
package com.sun.org.apache.bcel.internal.generic;
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* individuals on behalf of the Apache Software Foundation. For more
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import com.sun.org.apache.bcel.internal.Constants;
import java.io.*;
/**
* Wrapper class for push operations, which are implemented either as BIPUSH,
* LDC or xCONST_n instructions.
*
* @author <A HREF="mailto:markus.dahm@berlin.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)) // Use ICONST_n
instruction = INSTRUCTIONS[Constants.ICONST_0 + value];
else if((value >= -128) && (value <= 127)) // Use BIPUSH
instruction = new BIPUSH((byte)value);
else if((value >= -32768) && (value <= 32767)) // Use SIPUSH
instruction = new SIPUSH((short)value);
else // If everything fails create a Constant pool entry
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 // Create a Constant pool entry
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 // Create a Constant pool entry
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 // Create a Constant pool entry
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 // Create a Constant pool entry
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);
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(ConstantPoolGen cp, Character value) {
this(cp, (int)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)";
}
}