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305 lines
8.5 KiB
305 lines
8.5 KiB
/* MethodInfo Copyright (C) 1998-1999 Jochen Hoenicke.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id$
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*/
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package net.sf.jode.bytecode;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import java.lang.reflect.Modifier;
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///#def COLLECTIONEXTRA java.lang
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import java.lang.Comparable;
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///#enddef
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/**
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* <p>Represents a java bytecode method. A method consists of the following
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* parts:</p>
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*
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* <dl>
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*
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* <dt>name</dt><dd>The method's name</dd>
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*
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* <dt>type</dt><dd>The method's {@link TypeSignature type signature}
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* in bytecode format.</dd>
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*
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* <dt>modifiers</dt><dd>The modifiers of the method like private, public etc.
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* These are created by or-ing the constants defined in
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* {@link java.lang.reflect.Modifier}. </dt>
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*
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* <dt>basicblocks</dt><dd>the bytecode of the method in form of
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* {@link BasicBlocks basic blocks}, null if it is native or
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* abstract.</dd>
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*
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* <dt>synthetic</dt><dd>true if this method is synthetic</dd>
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*
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* <dt>deprecated</dt><dd>true if this method is deprecated</dd>
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*
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* <dt>exceptions</dt> <dd>the exceptions that the method declared in
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* its throws clause</dd>
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*
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* </dl>
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*
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* @author Jochen Hoenicke
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* @see net.sf.jode.bytecode.TypeSignature
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* @see net.sf.jode.bytecode.BasicBlocks
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*/
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public final class MethodInfo extends BinaryInfo implements Comparable {
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int modifier;
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String name;
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String typeSig;
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BasicBlocks basicblocks;
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String[] exceptions;
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boolean syntheticFlag;
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boolean deprecatedFlag;
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public MethodInfo() {
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}
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public MethodInfo(String name, String typeSig, int modifier) {
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this.name = name;
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this.typeSig = typeSig;
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this.modifier = modifier;
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}
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protected void readAttribute
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(String name, int length, ConstantPool cp,
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DataInputStream input, int howMuch) throws IOException {
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if (howMuch >= ClassInfo.NODEBUG && name.equals("Code")) {
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basicblocks = new BasicBlocks(this);
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basicblocks.read(cp, input, howMuch);
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} else if (howMuch >= ClassInfo.DECLARATIONS
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&& name.equals("Exceptions")) {
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int count = input.readUnsignedShort();
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exceptions = new String[count];
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for (int i = 0; i < count; i++)
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exceptions[i] = cp.getClassName(input.readUnsignedShort());
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if (length != 2 * (count + 1))
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throw new ClassFormatException
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("Exceptions attribute has wrong length");
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} else if (name.equals("Synthetic")) {
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syntheticFlag = true;
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if (length != 0)
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throw new ClassFormatException
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("Synthetic attribute has wrong length");
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} else if (name.equals("Deprecated")) {
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deprecatedFlag = true;
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if (length != 0)
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throw new ClassFormatException
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("Deprecated attribute has wrong length");
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} else
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super.readAttribute(name, length, cp, input, howMuch);
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}
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void read(ConstantPool constantPool,
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DataInputStream input, int howMuch) throws IOException {
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modifier = input.readUnsignedShort();
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name = constantPool.getUTF8(input.readUnsignedShort());
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typeSig = constantPool.getUTF8(input.readUnsignedShort());
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readAttributes(constantPool, input, howMuch);
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}
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void reserveSmallConstants(GrowableConstantPool gcp) {
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if (basicblocks != null)
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basicblocks.reserveSmallConstants(gcp);
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}
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void prepareWriting(GrowableConstantPool gcp) {
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gcp.putUTF8(name);
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gcp.putUTF8(typeSig);
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if (basicblocks != null) {
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gcp.putUTF8("Code");
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basicblocks.prepareWriting(gcp);
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}
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if (exceptions != null) {
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gcp.putUTF8("Exceptions");
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for (int i = 0; i < exceptions.length; i++)
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gcp.putClassName(exceptions[i]);
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}
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if (syntheticFlag)
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gcp.putUTF8("Synthetic");
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if (deprecatedFlag)
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gcp.putUTF8("Deprecated");
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prepareAttributes(gcp);
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}
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protected int getAttributeCount() {
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int count = super.getAttributeCount();
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if (basicblocks != null)
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count++;
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if (exceptions != null)
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count++;
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if (syntheticFlag)
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count++;
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if (deprecatedFlag)
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count++;
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return count;
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}
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protected void writeAttributes(GrowableConstantPool gcp,
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DataOutputStream output)
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throws IOException {
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super.writeAttributes(gcp, output);
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if (basicblocks != null) {
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output.writeShort(gcp.putUTF8("Code"));
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basicblocks.write(gcp, output);
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}
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if (exceptions != null) {
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int count = exceptions.length;
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output.writeShort(gcp.putUTF8("Exceptions"));
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output.writeInt(2 + count * 2);
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output.writeShort(count);
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for (int i = 0; i < count; i++)
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output.writeShort(gcp.putClassName(exceptions[i]));
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}
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if (syntheticFlag) {
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output.writeShort(gcp.putUTF8("Synthetic"));
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output.writeInt(0);
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}
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if (deprecatedFlag) {
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output.writeShort(gcp.putUTF8("Deprecated"));
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output.writeInt(0);
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}
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}
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void write(GrowableConstantPool constantPool,
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DataOutputStream output) throws IOException {
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output.writeShort(modifier);
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output.writeShort(constantPool.putUTF8(name));
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output.writeShort(constantPool.putUTF8(typeSig));
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writeAttributes(constantPool, output);
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}
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protected void drop(int keep) {
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if (keep < ClassInfo.DECLARATIONS)
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exceptions = null;
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if (keep < ClassInfo.NODEBUG)
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basicblocks = null;
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else
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basicblocks.drop(keep);
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super.drop(keep);
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}
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public String getName() {
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return name;
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}
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public String getType() {
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return typeSig;
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}
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public int getModifiers() {
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return modifier;
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}
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public boolean isConstructor() {
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return name.charAt(0) == '<';
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}
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public boolean isStatic() {
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return Modifier.isStatic(modifier);
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}
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public boolean isSynthetic() {
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return syntheticFlag;
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}
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public boolean isDeprecated() {
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return deprecatedFlag;
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}
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public BasicBlocks getBasicBlocks() {
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return basicblocks;
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}
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public String[] getExceptions() {
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return exceptions;
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}
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public void setName(String newName) {
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name = newName;
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}
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public void setType(String newType) {
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typeSig = newType;
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}
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public void setModifiers(int newModifier) {
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modifier = newModifier;
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}
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public void setSynthetic(boolean flag) {
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syntheticFlag = flag;
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}
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public void setDeprecated(boolean flag) {
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deprecatedFlag = flag;
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}
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public void setBasicBlocks(BasicBlocks newBasicblocks) {
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basicblocks = newBasicblocks;
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}
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public void setExceptions(String[] newExceptions) {
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exceptions = newExceptions;
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}
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/**
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* Compares two MethodInfo objects for method order. The method
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* order is as follows: First the static class intializer followed
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* by constructor with type signature sorted lexicographic. Then
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* all other methods sorted lexicographically by name. If two
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* methods have the same name, they are sorted by type signature.
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*
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* @return a positive number if this method follows the other in
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* method order, a negative number if it preceeds the
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* other, and 0 if they are equal.
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* @exception ClassCastException if other is not a ClassInfo.
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*/
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public int compareTo(Object other) {
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MethodInfo mi = (MethodInfo) other;
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/* Normally constructors should automatically sort themself to
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* the beginning, but if method name starts with a digit, the
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* order would be destroyed.
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*
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* The JVM explicitly forbids methods starting with digits,
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* nonetheless some obfuscators break this rule.
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*
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* But note that <clinit> comes lexicographically before <init>.
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*/
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if (name.charAt(0) != mi.name.charAt(0)) {
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if (name.charAt(0) == '<')
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return -1;
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if (mi.name.charAt(0) == '<')
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return 1;
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}
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int result = name.compareTo(mi.name);
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if (result == 0)
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result = typeSig.compareTo(mi.typeSig);
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return result;
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}
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/**
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* Returns a string representation of this method. It consists
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* of the method's name and type signature.
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* @return a string representation of this method.
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*/
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public String toString() {
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return "MethodInfo[name="+name+",type="+typeSig+"]";
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}
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}
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