| /* |
| * Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved. |
| */ |
| /* |
| * 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 java.io.DataOutputStream; |
| import java.io.IOException; |
| |
| import com.sun.org.apache.bcel.internal.classfile.Constant; |
| import com.sun.org.apache.bcel.internal.classfile.ConstantClass; |
| import com.sun.org.apache.bcel.internal.classfile.ConstantPool; |
| import com.sun.org.apache.bcel.internal.util.ByteSequence; |
| |
| /** |
| * Abstract super class for instructions that use an index into the |
| * constant pool such as LDC, INVOKEVIRTUAL, etc. |
| * |
| * @see ConstantPoolGen |
| * @see LDC |
| * @see INVOKEVIRTUAL |
| * |
| * @LastModified: Jan 2020 |
| */ |
| public abstract class CPInstruction extends Instruction implements TypedInstruction, |
| IndexedInstruction { |
| |
| private int index; // index to constant pool |
| |
| |
| /** |
| * Empty constructor needed for Instruction.readInstruction. |
| * Not to be used otherwise. |
| */ |
| CPInstruction() { |
| } |
| |
| |
| /** |
| * @param index to constant pool |
| */ |
| protected CPInstruction(final short opcode, final int index) { |
| super(opcode, (short) 3); |
| setIndex(index); |
| } |
| |
| |
| /** |
| * Dump instruction as byte code to stream out. |
| * @param out Output stream |
| */ |
| @Override |
| public void dump( final DataOutputStream out ) throws IOException { |
| out.writeByte(super.getOpcode()); |
| out.writeShort(index); |
| } |
| |
| |
| /** |
| * Long output format: |
| * |
| * <name of opcode> "["<opcode number>"]" |
| * "("<length of instruction>")" "<"< constant pool index>">" |
| * |
| * @param verbose long/short format switch |
| * @return mnemonic for instruction |
| */ |
| @Override |
| public String toString( final boolean verbose ) { |
| return super.toString(verbose) + " " + index; |
| } |
| |
| |
| /** |
| * @return mnemonic for instruction with symbolic references resolved |
| */ |
| @Override |
| public String toString( final ConstantPool cp ) { |
| final Constant c = cp.getConstant(index); |
| String str = cp.constantToString(c); |
| if (c instanceof ConstantClass) { |
| str = str.replace('.', '/'); |
| } |
| return com.sun.org.apache.bcel.internal.Const.getOpcodeName(super.getOpcode()) + " " + str; |
| } |
| |
| |
| /** |
| * Read needed data (i.e., index) from file. |
| * @param bytes input stream |
| * @param wide wide prefix? |
| */ |
| @Override |
| protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException { |
| setIndex(bytes.readUnsignedShort()); |
| super.setLength(3); |
| } |
| |
| |
| /** |
| * @return index in constant pool referred by this instruction. |
| */ |
| @Override |
| public final int getIndex() { |
| return index; |
| } |
| |
| |
| /** |
| * Set the index to constant pool. |
| * @param index in constant pool. |
| */ |
| @Override |
| public void setIndex( final int index ) { // TODO could be package-protected? |
| if (index < 0) { |
| throw new ClassGenException("Negative index value: " + index); |
| } |
| this.index = index; |
| } |
| |
| |
| /** @return type related with this instruction. |
| */ |
| @Override |
| public Type getType( final ConstantPoolGen cpg ) { |
| final ConstantPool cp = cpg.getConstantPool(); |
| String name = cp.getConstantString(index, com.sun.org.apache.bcel.internal.Const.CONSTANT_Class); |
| if (!name.startsWith("[")) { |
| name = "L" + name + ";"; |
| } |
| return Type.getType(name); |
| } |
| } |