Mercurial > hg > blitz_condensed
diff src/com/go/trove/classfile/CodeAttr.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/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; + } +}