Mercurial > hg > blitz_condensed
view src/com/go/trove/classfile/LocalVariableTableAttr.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
---|---|
date | Sat, 21 Mar 2009 11:00:06 +0000 |
parents | |
children |
line wrap: on
line source
/* ==================================================================== * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group * ==================================================================== * The Tea Software License, Version 1.1 * * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The end-user documentation included with the redistribution, * if any, must include the following acknowledgment: * "This product includes software developed by the * Walt Disney Internet Group (http://opensource.go.com/)." * Alternately, this acknowledgment may appear in the software itself, * if and wherever such third-party acknowledgments normally appear. * * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must * not be used to endorse or promote products derived from this * software without prior written permission. For written * permission, please contact opensource@dig.com. * * 5. Products derived from this software may not be called "Tea", * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior * written permission of the Walt Disney Internet Group. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * For more information about Tea, please see http://opensource.go.com/. */ package com.go.trove.classfile; import java.util.*; import java.io.*; /****************************************************************************** * This class corresponds to the LocalVariableTable_attribute structure as * defined in section 4.7.7 of <i>The Java Virtual Machine Specification</i>. * * @author Brian S O'Neill * @version * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 00/11/27 <!-- $--> */ class LocalVariableTableAttr extends Attribute { private List mEntries = new ArrayList(10); private List mCleanEntries; private int mRangeCount; public LocalVariableTableAttr(ConstantPool cp) { super(cp, LOCAL_VARIABLE_TABLE); } /** * Add an entry into the LocalVariableTableAttr. */ public void addEntry(LocalVariable localVar) { String varName = localVar.getName(); if (varName != null) { ConstantUTFInfo name = ConstantUTFInfo.make(mCp, varName); ConstantUTFInfo descriptor = ConstantUTFInfo.make(mCp, localVar.getType().toString()); mEntries.add(new Entry(localVar, name, descriptor)); } mCleanEntries = null; } public int getLength() { clean(); return 2 + 10 * mRangeCount; } public void writeDataTo(DataOutput dout) throws IOException { dout.writeShort(mRangeCount); int size = mCleanEntries.size(); for (int i=0; i<size; i++) { Entry entry = (Entry)mEntries.get(i); LocalVariable localVar = entry.mLocalVar; SortedSet ranges = localVar.getLocationRangeSet(); int name_index = entry.mName.getIndex(); int descriptor_index = entry.mDescriptor.getIndex(); int index = localVar.getNumber(); check("local variable table entry name index", name_index); check("local variable table entry descriptor index", descriptor_index); check("local variable table entry index", index); Iterator it = ranges.iterator(); while (it.hasNext()) { LocationRange range = (LocationRange)it.next(); Location startLocation = range.getStartLocation(); Location endLocation = range.getEndLocation(); int start_pc = startLocation.getLocation(); int length = endLocation.getLocation() - start_pc - 1; check("local variable table entry start PC", start_pc); dout.writeShort(start_pc); dout.writeShort(length); dout.writeShort(name_index); dout.writeShort(descriptor_index); dout.writeShort(index); } } } private void check(String type, int addr) throws RuntimeException { if (addr < 0 || addr > 65535) { throw new RuntimeException("Value for " + type + " out of " + "valid range: " + addr); } } private void clean() { if (mCleanEntries != null) { return; } // Clean out entries that are incomplete or bogus. int size = mEntries.size(); mCleanEntries = new ArrayList(size); mRangeCount = 0; outer: for (int i=0; i<size; i++) { Entry entry = (Entry)mEntries.get(i); LocalVariable localVar = entry.mLocalVar; SortedSet ranges = localVar.getLocationRangeSet(); if (ranges == null || ranges.size() == 0) { continue; } Iterator it = ranges.iterator(); while (it.hasNext()) { LocationRange range = (LocationRange)it.next(); Location startLocation = range.getStartLocation(); Location endLocation = range.getEndLocation(); if (startLocation == null || endLocation == null) { continue outer; } int start_pc = startLocation.getLocation(); int length = endLocation.getLocation() - start_pc - 1; if (length < 0) { continue outer; } } mCleanEntries.add(entry); mRangeCount += entry.getRangeCount(); } } static Attribute define(ConstantPool cp, String name, int length, DataInput din) throws IOException { LocalVariableTableAttr locals = new LocalVariableTableAttr(cp); int size = din.readUnsignedShort(); for (int i=0; i<size; i++) { int start_pc = din.readUnsignedShort(); int end_pc = start_pc + din.readUnsignedShort() + 1; int name_index = din.readUnsignedShort(); int descriptor_index = din.readUnsignedShort(); final int index = din.readUnsignedShort(); final ConstantUTFInfo varName = (ConstantUTFInfo)cp.getConstant(name_index); final ConstantUTFInfo varDesc = (ConstantUTFInfo)cp.getConstant(descriptor_index); final Location startLocation = new FixedLocation(start_pc); final Location endLocation = new FixedLocation(end_pc); SortedSet ranges = new TreeSet(); ranges.add(new LocationRangeImpl(startLocation, endLocation)); final SortedSet fRanges = Collections.unmodifiableSortedSet(ranges); LocalVariable localVar = new LocalVariable() { private String mName; private TypeDescriptor mType; { mName = varName.getValue(); mType = TypeDescriptor.parseTypeDesc(varDesc.getValue()); } public String getName() { return mName; } public void setName(String name) { mName = name; } public TypeDescriptor getType() { return mType; } public boolean isDoubleWord() { Class clazz = mType.getClassArg(); return (clazz == double.class || clazz == long.class); } public int getNumber() { return index; } public SortedSet getLocationRangeSet() { return fRanges; } }; Entry entry = new Entry(localVar, varName, varDesc); locals.mEntries.add(entry); } return locals; } private static class Entry { public LocalVariable mLocalVar; public ConstantUTFInfo mName; public ConstantUTFInfo mDescriptor; public Entry(LocalVariable localVar, ConstantUTFInfo name, ConstantUTFInfo descriptor) { mLocalVar = localVar; mName = name; mDescriptor = descriptor; } public int getRangeCount() { return mLocalVar.getLocationRangeSet().size(); } } }