--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/com/go/trove/classfile/CodeAttr.java	Sat Mar 21 11:00:06 2009 +0000
@@ -0,0 +1,260 @@
+/* ====================================================================
+ * 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 Code_attribute structure as defined in
+ * section 4.7.4 of <i>The Java Virtual Machine Specification</i>.
+ * To make it easier to create bytecode for the CodeAttr, use the 
+ * CodeBuilder.
+ *
+ * @author Brian S O'Neill
+ * @version
+ * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 01/01/02 <!-- $-->
+ * @see Opcode
+ * @see CodeBuilder
+ */
+public class CodeAttr extends Attribute {
+    private CodeBuffer mCodeBuffer;
+    private List mAttributes = new ArrayList(2);
+    
+    private LineNumberTableAttr mLineNumberTable;
+    private LocalVariableTableAttr mLocalVariableTable;
+
+    CodeAttr(ConstantPool cp) {
+        super(cp, CODE);
+    }
+    
+    /**
+     * Returns null if no CodeBuffer is defined for this CodeAttr.
+     */
+    public CodeBuffer getCodeBuffer() {
+        return mCodeBuffer;
+    }
+
+    public void setCodeBuffer(CodeBuffer code) {
+        mCodeBuffer = code;
+    }
+    
+    /**
+     * Returns the line number in the source code from the given bytecode
+     * address (start_pc).
+     *
+     * @return -1 if no line number is mapped for the start_pc.
+     */
+    public int getLineNumber(Location start) {
+        if (mLineNumberTable == null || start.getLocation() < 0) {
+            return -1;
+        }
+        else {
+            return mLineNumberTable.getLineNumber(start);
+        }
+    }
+
+    /**
+     * Map a bytecode address (start_pc) to a line number in the source code
+     * as a debugging aid.
+     */
+    public void mapLineNumber(Location start, int line_number) {
+        if (mLineNumberTable == null) {
+            addAttribute(new LineNumberTableAttr(mCp));
+        }
+
+        mLineNumberTable.addEntry(start, line_number);
+    }
+
+    /**
+     * Indicate a local variable's use information be recorded in the
+     * ClassFile as a debugging aid. If the LocalVariable doesn't provide
+     * both a start and end location, then its information is not recorded.
+     * This method should be called at most once per LocalVariable instance.
+     */
+    public void localVariableUse(LocalVariable localVar) {
+        if (mLocalVariableTable == null) {
+            addAttribute(new LocalVariableTableAttr(mCp));
+        }
+
+        mLocalVariableTable.addEntry(localVar);
+    }
+
+    public void addAttribute(Attribute attr) {
+        if (attr instanceof LineNumberTableAttr) {
+            if (mLineNumberTable != null) {
+                mAttributes.remove(mLineNumberTable);
+            }
+            mLineNumberTable = (LineNumberTableAttr)attr;
+        }
+        else if (attr instanceof LocalVariableTableAttr) {
+            if (mLocalVariableTable != null) {
+                mAttributes.remove(mLocalVariableTable);
+            }
+            mLocalVariableTable = (LocalVariableTableAttr)attr;
+        }
+
+        mAttributes.add(attr);
+    }
+    
+    public Attribute[] getAttributes() {
+        Attribute[] attrs = new Attribute[mAttributes.size()];
+        return (Attribute[])mAttributes.toArray(attrs);
+    }
+
+    /**
+     * Returns the length (in bytes) of this object in the class file.
+     */
+    public int getLength() {
+        int length = 12;
+
+        if (mCodeBuffer != null) {
+            length += mCodeBuffer.getByteCodes().length;
+            ExceptionHandler[] handlers = mCodeBuffer.getExceptionHandlers();
+            if (handlers != null) {
+                length += 8 * handlers.length;
+            }
+        }
+        
+        int size = mAttributes.size();
+        for (int i=0; i<size; i++) {
+            length += ((Attribute)mAttributes.get(i)).getLength();
+            length += 6; // attributes have an intial 6 byte length
+        }
+        
+        return length;
+    }
+
+    public void writeDataTo(DataOutput dout) throws IOException {
+        if (mCodeBuffer == null) {
+            throw new NullPointerException("CodeAttr has no CodeBuffer set");
+        }
+
+        ExceptionHandler[] handlers = mCodeBuffer.getExceptionHandlers();
+        
+        dout.writeShort(mCodeBuffer.getMaxStackDepth());
+        dout.writeShort(mCodeBuffer.getMaxLocals());
+        
+        byte[] byteCodes = mCodeBuffer.getByteCodes();
+        dout.writeInt(byteCodes.length);
+        dout.write(byteCodes);
+
+        if (handlers != null) {
+            int exceptionHandlerCount = handlers.length;
+            dout.writeShort(exceptionHandlerCount);
+
+            for (int i=0; i<exceptionHandlerCount; i++) {
+                handlers[i].writeTo(dout);
+            }
+        }
+        else {
+            dout.writeShort(0);
+        }
+        
+        int size = mAttributes.size();
+        dout.writeShort(size);
+        for (int i=0; i<size; i++) {
+            Attribute attr = (Attribute)mAttributes.get(i);
+            attr.writeTo(dout);
+        }
+    }
+
+    static Attribute define(ConstantPool cp,
+                            String name,
+                            int length,
+                            DataInput din,
+                            AttributeFactory attrFactory)
+        throws IOException
+    {
+        CodeAttr code = new CodeAttr(cp);
+
+        final int maxStackDepth = din.readUnsignedShort();
+        final int maxLocals = din.readUnsignedShort();
+
+        final byte[] byteCodes = new byte[din.readInt()];
+        din.readFully(byteCodes);
+
+        int exceptionHandlerCount = din.readUnsignedShort();
+        final ExceptionHandler[] handlers = 
+            new ExceptionHandler[exceptionHandlerCount];
+
+        for (int i=0; i<exceptionHandlerCount; i++) {
+            handlers[i] = ExceptionHandler.readFrom(cp, din);
+        }
+        
+        code.mCodeBuffer = new CodeBuffer() {
+            public int getMaxStackDepth() {
+                return maxStackDepth;
+            }
+            
+            public int getMaxLocals() {
+                return maxLocals;
+            }
+            
+            public byte[] getByteCodes() {
+                return (byte[])byteCodes.clone();
+            }
+            
+            public ExceptionHandler[] getExceptionHandlers() {
+                return (ExceptionHandler[])handlers.clone();
+            }
+        };
+
+        int attributeCount = din.readUnsignedShort();
+        for (int i=0; i<attributeCount; i++) {
+            code.addAttribute(Attribute.readFrom(cp, din, attrFactory));
+        }
+
+        return code;
+    }
+}