Mercurial > hg > blitz_condensed
diff 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> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/com/go/trove/classfile/LocalVariableTableAttr.java Sat Mar 21 11:00:06 2009 +0000 @@ -0,0 +1,275 @@ +/* ==================================================================== + * 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(); + } + } +}