| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * 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 com.sun.org.apache.bcel.internal.generic; |
| |
| 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)"; |
| } |
| } |