| /* |
| * 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. |
| */ |
| /* |
| * Contributor(s): Thomas Ball |
| */ |
| |
| package org.netbeans.modules.classfile; |
| |
| import java.io.DataInputStream; |
| import java.io.IOException; |
| |
| /** |
| * An entry in the local variable table of a method's code attribute. |
| * |
| * @author Thomas Ball |
| */ |
| public final class LocalVariableTableEntry { |
| |
| int startPC; |
| int length; |
| String name; |
| String description; |
| int index; |
| |
| static LocalVariableTableEntry[] loadLocalVariableTable(DataInputStream in, ConstantPool pool) |
| throws IOException { |
| int n = in.readUnsignedShort(); |
| LocalVariableTableEntry[] entries = new LocalVariableTableEntry[n]; |
| for (int i = 0; i < n; i++) |
| entries[i] = new LocalVariableTableEntry(in, pool); |
| return entries; |
| } |
| |
| /** Creates new LocalVariableTableEntry */ |
| LocalVariableTableEntry(DataInputStream in, ConstantPool pool) |
| throws IOException { |
| loadLocalVariableEntry(in, pool); |
| } |
| |
| private void loadLocalVariableEntry(DataInputStream in, ConstantPool pool) |
| throws IOException { |
| startPC = in.readUnsignedShort(); |
| length = in.readUnsignedShort(); |
| Object o = pool.get(in.readUnsignedShort()); |
| if (!(o instanceof CPUTF8Info)) |
| throw new InvalidClassFormatException(); |
| CPUTF8Info entry = (CPUTF8Info)o; |
| name = entry.getName(); |
| o = pool.get(in.readUnsignedShort()); |
| if (!(o instanceof CPUTF8Info)) |
| throw new InvalidClassFormatException(); |
| entry = (CPUTF8Info)o; |
| description = entry.getName(); |
| index = in.readUnsignedShort(); |
| } |
| |
| /** |
| * Returns the first byte code offset where this variable is valid. |
| */ |
| public final int getStartPC() { |
| return startPC; |
| } |
| |
| /** |
| * Returns the length of the range of code bytes where this variable |
| * is valid. |
| */ |
| public final int getLength() { |
| return length; |
| } |
| |
| /** |
| * Returns the name of this variable. |
| */ |
| public final String getName() { |
| return name; |
| } |
| |
| /** |
| * Returns the signature (type) of this variable. |
| */ |
| public final String getDescription() { |
| return description; |
| } |
| |
| /** |
| * Returns the variable's index into the local variable array |
| * for the current stack frame. |
| */ |
| public final int getIndex() { |
| return index; |
| } |
| } |