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Use a CodeAnalyzer

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use SoftReference under jdk1.2
clean up unused fields


git-svn-id: https://svn.code.sf.net/p/jode/code/trunk@499 379699f6-c40d-0410-875b-85095c16579e
stable
jochen 26 years ago
parent 6837d30c69
commit c0c72ebfec
1 changed files with 105 additions and 150 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 255
      jode/jode/obfuscator/MethodIdentifier.java

255
jode/jode/obfuscator/MethodIdentifier.java
Unescape View File

@ -1,29 +1,34 @@
/*
* MethodIdentifier (c) 1998 Jochen Hoenicke
/* MethodIdentifier Copyright (C) 1999 Jochen Hoenicke.
*
* You may distribute under the terms of the GNU General Public License.
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* IN NO EVENT SHALL JOCHEN HOENICKE BE LIABLE TO ANY PARTY FOR DIRECT,
* INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
* THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF JOCHEN HOENICKE
* HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* JOCHEN HOENICKE SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
* BASIS, AND JOCHEN HOENICKE HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
* SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id$
*/
package jode.obfuscator;
import java.lang.reflect.Modifier;
import jode.Obfuscator;
import jode.bytecode.*;
import jode.Type;
import java.io.*;
import java.util.Vector;
import java.util.Enumeration;
import java.util.Hashtable;
///#ifdef JDK12
///import java.lang.ref.SoftReference;
///#endif
public class MethodIdentifier extends Identifier implements Opcodes {
ClassIdentifier clazz;
@ -33,26 +38,55 @@ public class MethodIdentifier extends Identifier implements Opcodes {
*/
String[] exceptions;
///#ifdef JDK12
/// /**
/// * The code analyzer of this method, or null if there isn't any.
/// */
/// SoftReference codeAnalyzerRef;
///#else
/**
* The byte code of this method, or null if there isn't any.
* The code analyzer of this method, or null if there isn't any.
*/
BytecodeInfo bytecode;
CodeAnalyzer codeAnalyzer;
///#endif
public CodeAnalyzer getCodeAnalyzer() {
///#ifdef JDK12
/// if (codeAnalyzerRef != null && codeAnalyzerRef.get() != null)
/// return (CodeAnalyzer) codeAnalyzerRef.get();
/// CodeAnalyzer codeAnalyzer = null;
///#else
if (codeAnalyzer != null)
return codeAnalyzer;
///#endif
AttributeInfo codeattr = info.findAttribute("Code");
BytecodeInfo code = null;
try {
if (codeattr != null) {
DataInputStream stream = new DataInputStream
(new ByteArrayInputStream(codeattr.getContents()));
code = new BytecodeInfo();
code.read(clazz.info.getConstantPool(), stream);
}
} catch (IOException ex) {
ex.printStackTrace(Obfuscator.err);
}
if (code != null) {
codeAnalyzer = new ConstantAnalyzer(code, this);
///#ifdef JDK12
/// codeAnalyzerRef = new SoftReference(codeAnalyzer);
///#endif
}
return codeAnalyzer;
}
public MethodIdentifier(ClassIdentifier clazz, MethodInfo info) {
super(info.getName());
this.clazz = clazz;
this.info = info;
AttributeInfo codeattr = info.findAttribute("Code");
AttributeInfo exceptionsattr = info.findAttribute("Exceptions");
try {
if (codeattr != null) {
DataInputStream stream = new DataInputStream
(new ByteArrayInputStream(codeattr.getContents()));
bytecode = new BytecodeInfo();
bytecode.read(clazz.info.getConstantPool(), stream);
}
if (exceptionsattr != null)
readExceptions(exceptionsattr);
} catch (IOException ex) {
@ -67,53 +101,6 @@ public class MethodIdentifier extends Identifier implements Opcodes {
}
}
/**
* Reads the opcodes out of the code info and determine its
* references
* @return an enumeration of the references.
*/
public void analyzeCode() throws IOException {
for (Instruction instr = bytecode.getFirstInstr();
instr != null; instr = instr.nextByAddr) {
switch (instr.opcode) {
case opc_new:
case opc_anewarray:
case opc_checkcast:
case opc_instanceof:
case opc_multianewarray: {
String clName = (String) instr.objData;
if (clName.charAt(0) == '[') {
int i;
for (i=0; i< clName.length(); i++)
if (clName.charAt(i) != '[')
break;
if (i >= clName.length() || clName.charAt(i) != 'L')
break;
int index = clName.indexOf(';', i);
if (index != clName.length()-1)
break;
clName = clName.substring(i+1, index);
}
clazz.bundle.reachableIdentifier(clName, false);
break;
}
case opc_getstatic:
case opc_getfield:
case opc_invokespecial:
case opc_invokestatic:
case opc_invokeinterface:
case opc_invokevirtual: {
String[] names = (String[]) instr.objData;
clazz.bundle.reachableIdentifier
(names[0].replace('/','.')+"."+names[1]+"."+names[2],
instr.opcode == opc_invokevirtual
|| instr.opcode == opc_invokeinterface);
break;
}
}
}
}
public void readExceptions(AttributeInfo exceptionsattr)
throws IOException {
byte[] content = exceptionsattr.getContents();
@ -131,9 +118,12 @@ public class MethodIdentifier extends Identifier implements Opcodes {
public void setSingleReachable() {
super.setSingleReachable();
clazz.bundle.analyzeIdentifier(this);
}
public void analyze() {
if (Obfuscator.isDebugging)
Obfuscator.err.println("Reachable: "+this);
Obfuscator.err.println("Analyze: "+this);
String type = getType();
int index = type.indexOf('L');
@ -144,18 +134,13 @@ public class MethodIdentifier extends Identifier implements Opcodes {
index = type.indexOf('L', end);
}
if (bytecode != null) {
try {
analyzeCode();
} catch (IOException ex) {
ex.printStackTrace(Obfuscator.err);
System.exit(0);
}
}
if (exceptions != null) {
for (int i=0; i< exceptions.length; i++)
clazz.bundle.reachableIdentifier(exceptions[i], false);
}
if (getCodeAnalyzer() != null)
getCodeAnalyzer().analyzeCode();
}
public void readTable(Hashtable table) {
@ -208,22 +193,15 @@ public class MethodIdentifier extends Identifier implements Opcodes {
return "MethodIdentifier "+getFullName()+"."+getType();
}
int nameIndex;
int descriptorIndex;
int codeIndex;
BytecodeInfo bytecode;
byte[] code;
int exceptionsIndex;
int[] excIndices;
static byte[] buff = new byte[10];
static void copy(DataInputStream in, DataOutputStream out, int length)
throws IOException {
if (buff.length < length)
buff = new byte[length];
in.readFully(buff, 0, length);
out.write(buff, 0, length);
}
/**
* This method does the code transformation. This include
* <ul><li>new slot distribution for locals</li>
@ -232,87 +210,61 @@ public class MethodIdentifier extends Identifier implements Opcodes {
* </ul>
*/
public void doCodeTransformations(GrowableConstantPool gcp) {
if (bytecode != null) {
if (getCodeAnalyzer() != null) {
bytecode = getCodeAnalyzer().stripCode();
// bytecode.dumpCode(Obfuscator.err);
/* XXX This should be in a if (Obfuscator.distributeLocals) */
LocalOptimizer localOpt = new LocalOptimizer(bytecode);
localOpt.calcLocalInfo();
localOpt.stripLocals();
localOpt.distributeLocals();
if (Obfuscator.isDebugging)
localOpt.dumpLocals();
// if (Obfuscator.isDebugging)
// localOpt.dumpLocals();
// bytecode.dumpCode(Obfuscator.err);
RemovePopAnalyzer remPop = new RemovePopAnalyzer(bytecode, this);
remPop.stripCode();
// bytecode.dumpCode(Obfuscator.err);
for (Instruction instr = bytecode.getFirstInstr();
instr != null; instr = instr.nextByAddr) {
switch (instr.opcode) {
case opc_ldc:
gcp.reserveConstant(instr.objData);
break;
case opc_invokespecial:
case opc_invokestatic:
case opc_invokeinterface:
case opc_invokevirtual: {
String[] names = (String[]) instr.objData;
Reference ref = (Reference) instr.objData;
ClassIdentifier ci = (ClassIdentifier)
clazz.bundle.getIdentifier(names[0].replace('/','.'));
clazz.bundle.getIdentifier(ref.getClazz());
String newType = clazz.bundle.getTypeAlias(ref.getType());
if (ci != null) {
names[0] = ci.getFullAlias();
names[1] =
((MethodIdentifier)
ci.getIdentifier(names[1], names[2])).getAlias();
}
names[2] = clazz.bundle.getTypeAlias(names[2]);
MethodIdentifier mi = (MethodIdentifier)
ci.getIdentifier(ref.getName(), ref.getType());
instr.objData = new Reference
(ci.getFullAlias(), mi.getAlias(), newType);
} else
instr.objData = new Reference
(ref.getClazz(), ref.getName(), newType);
break;
}
case opc_putstatic:
case opc_putfield:
case opc_getstatic:
case opc_getfield: {
String[] names = (String[]) instr.objData;
ClassIdentifier ci = (ClassIdentifier)
clazz.bundle.getIdentifier(names[0].replace('/','.'));
if (ci != null) {
FieldIdentifier fi = (FieldIdentifier)
ci.getIdentifier(names[1], names[2]);
names[0] = ci.getFullAlias();
names[1] = fi.getAlias();
}
names[2] = clazz.bundle.getTypeAlias(names[2]);
break;
}
case opc_putstatic:
case opc_putfield: {
String[] names = (String[]) instr.objData;
Reference ref = (Reference) instr.objData;
String newType = clazz.bundle.getTypeAlias(ref.getType());
ClassIdentifier ci = (ClassIdentifier)
clazz.bundle.getIdentifier(names[0].replace('/','.'));
clazz.bundle.getIdentifier(ref.getClazz());
if (ci != null) {
FieldIdentifier fi = (FieldIdentifier)
ci.getIdentifier(names[1], names[2]);
if (Obfuscator.shouldStrip && !fi.isReachable()) {
/* Replace instruction with pop opcodes. */
int stacksize =
(instr.opcode
== Instruction.opc_putstatic) ? 0 : 1;
stacksize += jode.Type.tType(names[2]).stackSize();
if (stacksize == 3) {
/* Add a pop instruction after this opcode. */
Instruction second = new Instruction();
second.length = 1;
second.opcode = Instruction.opc_pop;
second.nextByAddr = instr.nextByAddr;
instr.nextByAddr = second;
second.nextByAddr.preds.removeElement(instr);
second.nextByAddr.preds.addElement(second);
stacksize--;
}
instr.objData = null;
instr.intData = 0;
instr.opcode = Instruction.opc_pop - 1 + stacksize;
instr.length = 1;
} else {
names[0] = ci.getFullAlias();
names[1] = fi.getAlias();
}
}
names[2] = clazz.bundle.getTypeAlias(names[2]);
ci.getIdentifier(ref.getName(), ref.getType());
instr.objData = new Reference
(ci.getFullAlias(), fi.getAlias(), newType);
} else
instr.objData = new Reference
(ref.getClazz(), ref.getName(), newType);
break;
}
case opc_new:
@ -344,6 +296,8 @@ public class MethodIdentifier extends Identifier implements Opcodes {
handlers[i].type = ci.getFullAlias();
}
}
bytecode.prepareWriting(gcp);
}
}
@ -353,9 +307,6 @@ public class MethodIdentifier extends Identifier implements Opcodes {
codeIndex = 0;
if (bytecode != null) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream output = new DataOutputStream(baos);
try {
@ -366,6 +317,7 @@ public class MethodIdentifier extends Identifier implements Opcodes {
} catch (IOException ex) {
code = null;
}
bytecode = null;
}
if (exceptions != null) {
exceptionsIndex = gcp.putUTF("Exceptions");
@ -378,6 +330,7 @@ public class MethodIdentifier extends Identifier implements Opcodes {
else
excIndices[i] = gcp.putClassRef(exceptions[i]);
}
exceptions = null;
}
}
@ -395,6 +348,7 @@ public class MethodIdentifier extends Identifier implements Opcodes {
out.writeShort(codeIndex);
out.writeInt(code.length);
out.write(code);
code = null;
}
if (excIndices != null) {
out.writeShort(exceptionsIndex);
@ -402,6 +356,7 @@ public class MethodIdentifier extends Identifier implements Opcodes {
out.writeShort(excIndices.length);
for (int i=0; i< excIndices.length; i++)
out.writeShort(excIndices[i]);
excIndices = null;
}
}
}

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