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A runtime patcher to introduce extension points into the original ImageJ (1.x). This project offers extension points for use with ImageJ2 and it also offers limited support for headless operations.
/*
* #%L
* ImageJ software for multidimensional image processing and analysis.
* %%
* Copyright (C) 2009 - 2016 Board of Regents of the University of
* Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
* Institute of Molecular Cell Biology and Genetics.
* %%
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS 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 COPYRIGHT HOLDERS OR 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.
* #L%
*/
package imagej.patcher;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.net.URL;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.jar.JarOutputStream;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import javassist.CannotCompileException;
import javassist.ClassClassPath;
import javassist.ClassPool;
import javassist.CtBehavior;
import javassist.CtClass;
import javassist.CtConstructor;
import javassist.CtField;
import javassist.CtMethod;
import javassist.CtNewConstructor;
import javassist.CtNewMethod;
import javassist.LoaderClassPath;
import javassist.Modifier;
import javassist.NotFoundException;
import javassist.bytecode.BadBytecode;
import javassist.bytecode.CodeAttribute;
import javassist.bytecode.CodeIterator;
import javassist.bytecode.ConstPool;
import javassist.bytecode.InstructionPrinter;
import javassist.bytecode.MethodInfo;
import javassist.bytecode.Opcode;
import javassist.expr.ConstructorCall;
import javassist.expr.ExprEditor;
import javassist.expr.FieldAccess;
import javassist.expr.Handler;
import javassist.expr.MethodCall;
import javassist.expr.NewExpr;
import net.imagej.patcher.JavaAgent;
/**
* The code hacker provides a mechanism for altering the behavior of classes
* before they are loaded, for the purpose of injecting new methods and/or
* altering existing ones.
*
* In ImageJ, this mechanism is used to provide new seams into legacy ImageJ1
* code, so that (e.g.) the modern UI is aware of legacy ImageJ events as they
* occur.
*
*
* @author Curtis Rueden
* @author Rick Lentz
* @author Johannes Schindelin
*/
@Deprecated
class CodeHacker {
private final ClassPool pool;
protected final ClassLoader classLoader;
private final Set handledClasses = new LinkedHashSet();
private final boolean onlyLogExceptions;
public CodeHacker(final ClassLoader classLoader, final ClassPool classPool) {
this.classLoader = classLoader;
pool = classPool != null ? classPool : ClassPool.getDefault();
pool.appendClassPath(new ClassClassPath(getClass()));
pool.appendClassPath(new LoaderClassPath(classLoader));
onlyLogExceptions = !Utils.stackTraceContains("junit.");
}
public CodeHacker(final ClassLoader classLoader) {
this(classLoader, null);
}
private void maybeThrow(final IllegalArgumentException e) {
if (onlyLogExceptions) e.printStackTrace();
else throw e;
}
/**
* Modifies a class by injecting the provided code string at the end of the
* specified method's body.
*
* @param fullClass Fully qualified name of the class to modify.
* @param methodSig Method signature of the method to modify; e.g.,
* "public void updateAndDraw()"
* @param newCode The string of code to add; e.g., System.out.println(\"Hello
* World!\");
*/
public void insertAtBottomOfMethod(final String fullClass,
final String methodSig, final String newCode)
{
try {
getBehavior(fullClass, methodSig).insertAfter(newCode);
}
catch (final Throwable e) {
maybeThrow(new IllegalArgumentException("Cannot modify method: " +
methodSig, e));
}
}
/**
* Modifies a class by injecting the provided code string at the start of the
* specified method's body.
*
* @param fullClass Fully qualified name of the class to override.
* @param methodSig Method signature of the method to override; e.g.,
* "public void updateAndDraw()"
* @param newCode The string of code to add; e.g., System.out.println(\"Hello
* World!\");
*/
public void insertAtTopOfMethod(final String fullClass,
final String methodSig, final String newCode)
{
try {
final CtBehavior behavior = getBehavior(fullClass, methodSig);
if (behavior instanceof CtConstructor) {
((CtConstructor) behavior).insertBeforeBody(newCode);
}
else {
behavior.insertBefore(newCode);
}
}
catch (final Throwable e) {
maybeThrow(new IllegalArgumentException("Cannot modify method: " +
methodSig, e));
}
}
/**
* Modifies a class by injecting the provided code string as a new method.
*
* @param fullClass Fully qualified name of the class to override.
* @param methodSig Method signature of the method to override; e.g.,
* "public void updateAndDraw()"
* @param newCode The string of code to add; e.g., System.out.println(\"Hello
* World!\");
*/
public void insertNewMethod(final String fullClass, final String methodSig,
final String newCode)
{
final CtClass classRef = getClass(fullClass);
final String methodBody = methodSig + " { " + newCode + " } ";
try {
final CtMethod methodRef = CtNewMethod.make(methodBody, classRef);
classRef.addMethod(methodRef);
}
catch (final Throwable e) {
maybeThrow(new IllegalArgumentException(
"Cannot add method: " + methodSig, e));
}
}
/**
* Works around a bug where the horizontal scroll wheel of the mighty mouse is
* mistaken for a popup trigger.
*/
public void handleMightyMousePressed(final String fullClass) {
final ExprEditor editor = new ExprEditor() {
@Override
public void edit(final MethodCall call) throws CannotCompileException {
if (call.getMethodName().equals("isPopupTrigger")) {
call.replace("$_ = $0.isPopupTrigger() && $0.getButton() != 0;");
}
}
};
final CtClass classRef = getClass(fullClass);
for (final String methodName : new String[] { "mousePressed",
"mouseDragged" })
try {
final CtMethod method =
classRef.getMethod(methodName, "(Ljava/awt/event/MouseEvent;)V");
method.instrument(editor);
}
catch (final NotFoundException e) {
/* ignore */
}
catch (final Throwable e) {
maybeThrow(new IllegalArgumentException("Cannot instrument method: " +
methodName, e));
}
}
public void insertPrivateStaticField(final String fullClass,
final Class clazz, final String name)
{
insertStaticField(fullClass, Modifier.PRIVATE, clazz, name, null);
}
public void insertPublicStaticField(final String fullClass,
final Class clazz, final String name, final String initializer)
{
insertStaticField(fullClass, Modifier.PUBLIC, clazz, name, initializer);
}
public void insertStaticField(final String fullClass, final int modifiers,
final Class clazz, final String name, final String initializer)
{
final CtClass classRef = getClass(fullClass);
try {
final CtField field =
new CtField(pool.get(clazz.getName()), name, classRef);
field.setModifiers(modifiers | Modifier.STATIC);
classRef.addField(field);
if (initializer != null) {
addToClassInitializer(fullClass, name + " = " + initializer + ";");
}
}
catch (final Throwable e) {
maybeThrow(new IllegalArgumentException("Cannot add field " + name +
" to " + fullClass, e));
}
}
public void addToClassInitializer(final String fullClass, final String code) {
final CtClass classRef = getClass(fullClass);
try {
CtConstructor method = classRef.getClassInitializer();
if (method != null) {
method.insertAfter(code);
}
else {
method =
CtNewConstructor.make(new CtClass[0], new CtClass[0], code, classRef);
method.getMethodInfo().setName("");
method.setModifiers(Modifier.STATIC);
classRef.addConstructor(method);
}
}
catch (final Throwable e) {
maybeThrow(new IllegalArgumentException("Cannot add " + code +
" to class initializer of " + fullClass, e));
}
}
public void addCatch(final String fullClass, final String methodSig,
final String exceptionClassName, final String src)
{
try {
final CtBehavior method = getBehavior(fullClass, methodSig);
method.addCatch(src, getClass(exceptionClassName), "$e");
}
catch (final Throwable e) {
maybeThrow(new IllegalArgumentException(
"Cannot add catch for exception of type'" + exceptionClassName +
" in " + fullClass + "'s " + methodSig, e));
}
}
public void insertAtTopOfExceptionHandlers(final String fullClass,
final String methodSig, final String exceptionClassName, final String src)
{
try {
final CtBehavior method = getBehavior(fullClass, methodSig);
new EagerExprEditor() {
@Override
public void edit(final Handler handler) throws CannotCompileException {
try {
if (handler.getType().getName().equals(exceptionClassName)) {
handler.insertBefore(src);
markEdited();
}
}
catch (final Exception e) {
e.printStackTrace();
}
}
}.instrument(method);
}
catch (final Throwable e) {
maybeThrow(new IllegalArgumentException(
"Cannot edit exception handler for type'" + exceptionClassName +
" in " + fullClass + "'s " + methodSig, e));
}
}
/**
* Replaces the application name in the given method in the given parameter to
* the given constructor call.
*
* Fails silently if the specified method does not exist (e.g. CommandFinder's
* export() function just went away in 1.47i).
*
*
* @param fullClass Fully qualified name of the class to override.
* @param methodSig Method signature of the method to override; e.g.,
* "public void showMessage(String title, String message)"
* @param newClassName the name of the class which is to be constructed by the
* new operator
* @param parameterIndex the index of the parameter containing the application
* name
* @param replacement the code to use instead of the specified parameter
*/
protected void replaceAppNameInNew(final String fullClass,
final String methodSig, final String newClassName,
final int parameterIndex, final String replacement)
{
try {
final CtBehavior method = getBehavior(fullClass, methodSig);
new EagerExprEditor() {
@Override
public void edit(final NewExpr expr) throws CannotCompileException {
if (expr.getClassName().equals(newClassName)) try {
final CtClass[] parameterTypes =
expr.getConstructor().getParameterTypes();
if (parameterTypes[parameterIndex - 1] != CodeHacker.this
.getClass("java.lang.String"))
{
maybeThrow(new IllegalArgumentException("Parameter " +
parameterIndex + " of " + expr.getConstructor() +
" is not a String!"));
return;
}
final String replace =
replaceAppName(parameterIndex, parameterTypes.length, replacement);
expr.replace("$_ = new " + newClassName + replace + ";");
markEdited();
}
catch (final NotFoundException e) {
maybeThrow(new IllegalArgumentException(
"Cannot find the parameters of the constructor of " +
newClassName, e));
}
}
}.instrument(method);
}
catch (final Throwable e) {
maybeThrow(new IllegalArgumentException("Cannot handle app name in " +
fullClass + "'s " + methodSig, e));
}
}
/**
* Replaces the application name in the given method in the given parameter to
* the given method call.
*
* Fails silently if the specified method does not exist (e.g. CommandFinder's
* export() function just went away in 1.47i).
*
*
* @param fullClass Fully qualified name of the class to override.
* @param methodSig Method signature of the method to override; e.g.,
* "public void showMessage(String title, String message)"
* @param calledMethodName the name of the method to which the application
* name is passed
* @param parameterIndex the index of the parameter containing the application
* name
* @param replacement the code to use instead of the specified parameter
*/
protected void replaceAppNameInCall(final String fullClass,
final String methodSig, final String calledMethodName,
final int parameterIndex, final String replacement)
{
try {
final CtBehavior method = getBehavior(fullClass, methodSig);
new EagerExprEditor() {
@Override
public void edit(final MethodCall call) throws CannotCompileException {
if (call.getMethodName().equals(calledMethodName)) try {
final boolean isSuper = call.isSuper();
final CtClass[] parameterTypes =
isSuper ? ((ConstructorCall) call).getConstructor()
.getParameterTypes() : call.getMethod().getParameterTypes();
if (parameterTypes.length < parameterIndex) {
maybeThrow(new IllegalArgumentException("Index " +
parameterIndex + " is outside of " + call.getMethod() +
"'s parameter list!"));
return;
}
if (parameterTypes[parameterIndex - 1] != CodeHacker.this
.getClass("java.lang.String"))
{
maybeThrow(new IllegalArgumentException("Parameter " +
parameterIndex + " of " + call.getMethod() +
" is not a String!"));
return;
}
final String replace =
replaceAppName(parameterIndex, parameterTypes.length, replacement);
call.replace((isSuper ? "" : "$0.") + calledMethodName + replace +
";");
markEdited();
}
catch (final NotFoundException e) {
maybeThrow(new IllegalArgumentException(
"Cannot find the parameters of the method " + calledMethodName, e));
}
}
@Override
public void edit(final ConstructorCall call)
throws CannotCompileException
{
edit((MethodCall) call);
}
}.instrument(method);
}
catch (final Throwable e) {
maybeThrow(new IllegalArgumentException("Cannot handle app name in " +
fullClass + "'s " + methodSig, e));
}
}
private String replaceAppName(final int parameterIndex,
final int parameterCount, final String replacement)
{
final StringBuilder builder = new StringBuilder();
builder.append("(");
for (int i = 1; i <= parameterCount; i++) {
if (i > 1) {
builder.append(", ");
}
builder.append("$").append(i);
if (i == parameterIndex) {
builder.append(".replace(\"ImageJ\", " + replacement + ")");
}
}
builder.append(")");
return builder.toString();
}
/**
* Patches the bytecode of the given method to not return on a null check.
*
* This is needed to patch support for alternative editors into ImageJ 1.x.
*
*
* @param fullClass the class of the method to instrument
* @param methodSig the signature of the method to instrument
*/
public void dontReturnOnNull(final String fullClass, final String methodSig) {
final CtBehavior behavior = getBehavior(fullClass, methodSig);
final MethodInfo info = behavior.getMethodInfo();
final CodeIterator iterator = info.getCodeAttribute().iterator();
while (iterator.hasNext())
try {
int pos = iterator.next();
final int c = iterator.byteAt(pos);
if (c == Opcode.IFNONNULL && iterator.byteAt(pos + 3) == Opcode.RETURN)
{
iterator.writeByte(Opcode.POP, pos++);
iterator.writeByte(Opcode.NOP, pos++);
iterator.writeByte(Opcode.NOP, pos++);
iterator.writeByte(Opcode.NOP, pos++);
return;
}
}
catch (final Throwable e) {
maybeThrow(new IllegalArgumentException(e));
return;
}
maybeThrow(new IllegalArgumentException("Method " + methodSig + " in " +
fullClass + " does not return on null"));
}
/**
* Replaces the given methods with stub methods.
*
* @param fullClass the class to patch
* @param methodNames the names of the methods to replace
*/
public void replaceWithStubMethods(final String fullClass,
final String... methodNames)
{
final CtClass clazz = getClass(fullClass);
final Set override =
new HashSet(Arrays.asList(methodNames));
for (final CtMethod method : clazz.getMethods())
if (override.contains(method.getName())) try {
final CtMethod stub = makeStubMethod(clazz, method);
method.setBody(stub, null);
}
catch (final Throwable e) {
maybeThrow(new IllegalArgumentException("Cannot instrument method: " +
method.getName(), e));
}
}
/**
* Replaces the superclass.
*
* @param fullClass
* @param fullNewSuperclass
*/
public void replaceSuperclass(final String fullClass,
final String fullNewSuperclass)
{
final CtClass clazz = getClass(fullClass);
try {
final CtClass originalSuperclass = clazz.getSuperclass();
clazz.setSuperclass(getClass(fullNewSuperclass));
for (final CtConstructor ctor : clazz.getConstructors())
ctor.instrument(new ExprEditor() {
@Override
public void edit(final ConstructorCall call)
throws CannotCompileException
{
if (call.getMethodName().equals("super")) call.replace("super();");
}
});
letSuperclassMethodsOverride(clazz);
addMissingMethods(clazz, originalSuperclass);
}
catch (final Throwable e) {
maybeThrow(new IllegalArgumentException(
"Could not replace superclass of " + fullClass + " with " +
fullNewSuperclass, e));
}
}
/**
* Replaces all instantiations of a subset of AWT classes with nulls.
*
* This is used by the partial headless support of legacy code.
*
*/
public void skipAWTInstantiations(final String fullClass) {
try {
skipAWTInstantiations(getClass(fullClass));
}
catch (final Throwable e) {
maybeThrow(new IllegalArgumentException(
"Could not skip AWT class instantiations in " + fullClass, e));
}
}
/**
* Replaces every field write access to the specified field in the specified
* method.
*
* @param fullClass the full class
* @param methodSig the signature of the method to instrument
* @param fieldName the field whose write access to override
* @param newCode the code to run instead of the field access
*/
public void overrideFieldWrite(final String fullClass,
final String methodSig, final String fieldName, final String newCode)
{
try {
final CtBehavior method = getBehavior(fullClass, methodSig);
new EagerExprEditor() {
@Override
public void edit(final FieldAccess access)
throws CannotCompileException
{
if (access.getFieldName().equals(fieldName)) {
access.replace(newCode);
markEdited();
}
}
}.instrument(method);
}
catch (final Throwable e) {
maybeThrow(new IllegalArgumentException(
"Cannot override field access to " + fieldName + " in " + fullClass +
"'s " + methodSig, e));
}
}
/**
* Replaces a call in the given method.
*
* @param fullClass the class of the method to edit
* @param methodSig the signature of the method to edit
* @param calledClass the class of the called method to replace
* @param calledMethodName the name of the called method to replace
* @param newCode the code to replace the call with
*/
public void replaceCallInMethod(final String fullClass,
final String methodSig, final String calledClass,
final String calledMethodName, final String newCode)
{
replaceCallInMethod(fullClass, methodSig, calledClass, calledMethodName,
newCode, -1);
}
/**
* Replaces a call in the given method.
*
* @param fullClass the class of the method to edit
* @param methodSig the signature of the method to edit
* @param calledClass the class of the called method to replace
* @param calledMethodName the name of the called method to replace
* @param newCode the code to replace the call with
* @param onlyNth if positive, only replace the nth call
*/
public void replaceCallInMethod(final String fullClass,
final String methodSig, final String calledClass,
final String calledMethodName, final String newCode, final int onlyNth)
{
try {
final CtBehavior method = getBehavior(fullClass, methodSig);
new EagerExprEditor() {
private int counter = 0;
private final boolean debug = false;
@Override
public void edit(final MethodCall call) throws CannotCompileException {
if (debug) {
System.err.println("editing call " + call.getClassName() + "#" +
call.getMethodName() + " (wanted " + calledClass + "#" +
calledMethodName + ")");
}
if (call.getMethodName().equals(calledMethodName) &&
call.getClassName().equals(calledClass))
{
if (onlyNth > 0 && ++counter != onlyNth) return;
call.replace(newCode);
markEdited();
}
}
@Override
public void edit(final ConstructorCall call) throws CannotCompileException {
if (debug) {
System.err.println("editing ctor " + call.getClassName() + "#" +
call.getMethodName() + " (wanted " + calledClass + "#" +
calledMethodName + ")");
}
if (call.getMethodName().equals(calledMethodName) &&
call.getClassName().equals(calledClass))
{
if (onlyNth > 0 && ++counter != onlyNth) return;
call.replace(newCode);
markEdited();
}
}
@Override
public void edit(final NewExpr expr) throws CannotCompileException {
if (debug) {
System.err.println("editing call " + expr.getClassName() + "#" +
"" + " (wanted " + calledClass + "#" + calledMethodName +
")");
}
if ("".equals(calledMethodName) &&
expr.getClassName().equals(calledClass))
{
if (onlyNth > 0 && ++counter != onlyNth) return;
expr.replace(newCode);
markEdited();
}
}
}.instrument(method);
}
catch (final Throwable e) {
maybeThrow(new IllegalArgumentException("Cannot handle replace call to " +
calledMethodName + " in " + fullClass + "'s " + methodSig, e));
}
}
/**
* Loads the given, possibly modified, class.
*
* This method must be called to confirm any changes made with
* {@link #insertAtBottomOfMethod}, {@link #insertAtTopOfMethod}, or
* {@link #insertNewMethod}.
*
*
* @param fullClass Fully qualified class name to load.
* @return the loaded class
*/
public Class loadClass(final String fullClass) {
final CtClass classRef = getClass(fullClass);
return loadClass(classRef);
}
/**
* Loads the given, possibly modified, class.
*
* This method must be called to confirm any changes made with
* {@link #insertAtBottomOfMethod}, {@link #insertAtTopOfMethod}, or
* {@link #insertNewMethod}.
*
*
* @param classRef class to load.
* @return the loaded class
*/
public Class loadClass(final CtClass classRef) {
try {
return classRef.toClass(classLoader, null);
}
catch (final CannotCompileException e) {
// Cannot use LogService; it will not be initialized by the time the
// DefaultLegacyService
// class is loaded, which is when the CodeHacker is run
if (e.getCause() != null && e.getCause() instanceof LinkageError) {
throw javaAgentHint("Cannot load class: " + classRef.getName() +
" (loader: " + classLoader + ")", e.getCause());
}
System.err.println("Warning: Cannot load class: " + classRef.getName() +
" into " + classLoader);
e.printStackTrace();
return null;
}
finally {
classRef.freeze();
}
}
static RuntimeException javaAgentHint(final String message, final Throwable cause)
{
final URL url = Utils.getLocation(JavaAgent.class);
final String path =
url != null && "file".equals(url.getProtocol()) &&
url.getPath().endsWith(".jar") ? url.getPath()
: "/path/to/ij1-patcher.jar";
return new RuntimeException(message + "\n" +
"It appears that this class was already defined in the class loader!\n" +
"Please make sure that you initialize the LegacyService before using\n" +
"any ImageJ 1.x class. You can do that by adding this static initializer:\n\n" +
"\tstatic {\n" +
"\t\tLegacyInjector.preinit();\n" +
"\t}\n\n" +
"To debug this issue, start the JVM with the option:\n\n" +
"\t-javaagent:" +
path +
"\n\n" +
"To enforce pre-initialization, start the JVM with the option:\n\n" +
"\t-javaagent:" + path + "=init\n", cause);
}
public void loadClasses() {
try {
JavaAgent.stop();
}
catch (final Throwable t) {
// ignore
}
final Iterator iter = handledClasses.iterator();
while (iter.hasNext()) {
final CtClass classRef = iter.next();
if (!classRef.isFrozen() && classRef.isModified()) {
loadClass(classRef);
}
iter.remove();
}
}
/** Gets the list of patched classes. */
Collection getPatchedClasses() {
final Set result = new HashSet();
for (final CtClass clazz : handledClasses) {
if (!clazz.isFrozen() && clazz.isModified()) {
result.add(clazz);
}
}
return result;
}
/** Gets the Javassist class object corresponding to the given class name. */
CtClass getClass(final String fullClass) {
try {
final CtClass classRef = pool.get(fullClass);
if (classRef.getClassPool() == pool) handledClasses.add(classRef);
return classRef;
}
catch (final NotFoundException e) {
throw new IllegalArgumentException("No such class: " + fullClass, e);
}
}
/**
* Gets the method or constructor of the specified class and signature.
*
* @param fullClass the class containing the method or constructor
* @param methodSig the method (or if the name is <init>,
* the constructor)
* @return the method or constructor
*/
private CtBehavior
getBehavior(final String fullClass, final String methodSig)
{
if (methodSig.indexOf("") < 0) {
return getMethod(fullClass, methodSig);
}
return getConstructor(fullClass, methodSig);
}
/**
* Gets the Javassist method object corresponding to the given method
* signature of the specified class name.
*/
private CtMethod getMethod(final String fullClass, final String methodSig) {
final CtClass cc = getClass(fullClass);
final String name = getMethodName(methodSig);
final String[] argTypes = getMethodArgTypes(methodSig);
final CtClass[] params = new CtClass[argTypes.length];
for (int i = 0; i < params.length; i++) {
params[i] = getClass(argTypes[i]);
}
try {
return cc.getDeclaredMethod(name, params);
}
catch (final NotFoundException e) {
throw new IllegalArgumentException("No such method: " + methodSig, e);
}
}
/**
* Gets the Javassist constructor object corresponding to the given
* constructor signature of the specified class name.
*/
private CtConstructor getConstructor(final String fullClass,
final String constructorSig)
{
final CtClass cc = getClass(fullClass);
final String[] argTypes = getMethodArgTypes(constructorSig);
final CtClass[] params = new CtClass[argTypes.length];
for (int i = 0; i < params.length; i++) {
params[i] = getClass(argTypes[i]);
}
try {
return cc.getDeclaredConstructor(params);
}
catch (final NotFoundException e) {
throw new IllegalArgumentException("No such method: " + constructorSig, e);
}
}
/** Extracts the method name from the given method signature. */
private String getMethodName(final String methodSig) {
final int parenIndex = methodSig.indexOf("(");
final int spaceIndex = methodSig.lastIndexOf(" ", parenIndex);
return methodSig.substring(spaceIndex + 1, parenIndex);
}
private String[] getMethodArgTypes(final String methodSig) {
final int parenIndex = methodSig.indexOf("(");
final String methodArgs =
methodSig.substring(parenIndex + 1, methodSig.length() - 1);
final String[] args =
methodArgs.equals("") ? new String[0] : methodArgs.split(",");
for (int i = 0; i < args.length; i++) {
args[i] = args[i].trim().split(" ")[0];
}
return args;
}
/**
* Determines whether the specified class has the specified field.
*
* @param fullName the class name
* @param fieldName the field name
* @return whether the field exists
*/
public boolean hasField(final String fullName, final String fieldName) {
final CtClass clazz = getClass(fullName);
try {
return clazz.getField(fieldName) != null;
}
catch (final Throwable e) {
return false;
}
}
/**
* Determines whether the specified class has the specified method.
*
* @param fullClass the class name
* @param methodSig the signature of the method
* @return whether the class has the specified method
*/
public boolean hasMethod(final String fullClass, final String methodSig) {
try {
return getBehavior(fullClass, methodSig) != null;
}
catch (final Throwable e) {
return false;
}
}
/**
* Determines whether the specified class is known to Javassist.
*
* @param fullClass the class name
* @return whether the class exists
*/
public boolean existsClass(final String fullClass) {
try {
return pool.get(fullClass) != null;
}
catch (final Throwable e) {
return false;
}
}
public boolean hasSuperclass(final String fullClass,
final String fullSuperclass)
{
try {
final CtClass clazz = getClass(fullClass);
return fullSuperclass.equals(clazz.getSuperclass().getName());
}
catch (final Throwable e) {
return false;
}
}
private static int verboseLevel = 0;
private static CtMethod makeStubMethod(final CtClass clazz,
final CtMethod original) throws CannotCompileException, NotFoundException
{
// add a stub
String prefix = "";
if (verboseLevel > 0) {
prefix =
"System.err.println(\"Called " + original.getLongName() + "\\n\"";
if (verboseLevel > 1) {
prefix += "+ \"\\t(\" + fiji.Headless.toString($args) + \")\\n\"";
}
prefix += ");";
}
final CtClass type = original.getReturnType();
final String body =
"{" +
prefix +
(type == CtClass.voidType ? "" : "return " + defaultReturnValue(type) +
";") + "}";
final CtClass[] types = original.getParameterTypes();
return CtNewMethod.make(type, original.getName(), types, new CtClass[0],
body, clazz);
}
private static String defaultReturnValue(final CtClass type) {
if (type == CtClass.booleanType) return "false";
if (type == CtClass.byteType) return "(byte)0";
if (type == CtClass.charType) return "'\0'";
if (type == CtClass.doubleType) return "0.0";
if (type == CtClass.floatType) return "0.0f";
if (type == CtClass.intType) return "0";
if (type == CtClass.longType) return "0l";
if (type == CtClass.shortType) return "(short)0";
return "null";
}
private void addMissingMethods(final CtClass fakeClass,
final CtClass originalClass) throws CannotCompileException,
NotFoundException
{
if (verboseLevel > 0) {
System.err.println("adding missing methods from " +
originalClass.getName() + " to " + fakeClass.getName());
}
final Set available = new HashSet();
for (final CtMethod method : fakeClass.getMethods())
available.add(stripPackage(method.getLongName()));
for (final CtMethod original : originalClass.getDeclaredMethods()) {
if (available.contains(stripPackage(original.getLongName()))) {
if (verboseLevel > 1) {
System.err.println("Skipping available method " + original);
}
continue;
}
final CtMethod method = makeStubMethod(fakeClass, original);
fakeClass.addMethod(method);
if (verboseLevel > 1) {
System.err.println("adding missing method " + method);
}
}
// interfaces
final Set availableInterfaces = new HashSet();
for (final CtClass iface : fakeClass.getInterfaces())
availableInterfaces.add(iface);
for (final CtClass iface : originalClass.getInterfaces())
if (!availableInterfaces.contains(iface)) fakeClass.addInterface(iface);
final CtClass superClass = originalClass.getSuperclass();
if (superClass != null && !superClass.getName().equals("java.lang.Object"))
{
addMissingMethods(fakeClass, superClass);
}
}
private void letSuperclassMethodsOverride(final CtClass clazz)
throws CannotCompileException, NotFoundException
{
for (final CtMethod method : clazz.getSuperclass().getDeclaredMethods()) {
final CtMethod method2 =
clazz.getMethod(method.getName(), method.getSignature());
if (method2.getDeclaringClass().equals(clazz)) {
// make sure no calls/accesses to GUI components are remaining
method2.setBody(method, null);
method2.setName("narf" + method.getName());
}
}
}
private static String stripPackage(final String className) {
int lastDot = -1;
for (int i = 0;; i++) {
if (i >= className.length()) return className.substring(lastDot + 1);
final char c = className.charAt(i);
if (c == '.' || c == '$') lastDot = i;
else if (c >= 'A' && c <= 'Z') ; // continue
else if (c >= 'a' && c <= 'z') ; // continue
else if (i > lastDot + 1 && c >= '0' && c <= '9') ; // continue
else return className.substring(lastDot + 1);
}
}
private void skipAWTInstantiations(final CtClass clazz)
throws CannotCompileException
{
clazz.instrument(new ExprEditor() {
@Override
public void edit(final NewExpr expr) throws CannotCompileException {
final String name = expr.getClassName();
if (name.startsWith("java.awt.Menu") ||
name.equals("java.awt.PopupMenu") ||
name.startsWith("java.awt.Checkbox") || name.equals("java.awt.Frame"))
{
expr.replace("$_ = null;");
}
else if (expr.getClassName().equals("ij.gui.StackWindow")) {
expr.replace("$1.show(); $_ = null;");
}
}
@Override
public void edit(final MethodCall call) throws CannotCompileException {
final String className = call.getClassName();
final String methodName = call.getMethodName();
if (className.startsWith("java.awt.Menu") ||
className.equals("java.awt.PopupMenu") ||
className.startsWith("java.awt.Checkbox")) try {
final CtClass type = call.getMethod().getReturnType();
if (type == CtClass.voidType) {
call.replace("");
}
else {
call.replace("$_ = " + defaultReturnValue(type) + ";");
}
}
catch (final NotFoundException e) {
e.printStackTrace();
}
else if (methodName.equals("put") &&
className.equals("java.util.Properties"))
{
call.replace("if ($1 != null && $2 != null) $_ = $0.put($1, $2);"
+ "else $_ = null;");
}
else if (methodName.equals("get") &&
className.equals("java.util.Properties"))
{
call.replace("$_ = $1 != null ? $0.get($1) : null;");
}
else if (className.equals("java.lang.Integer") &&
methodName.equals("intValue"))
{
call.replace("$_ = $0 == null ? 0 : $0.intValue();");
}
else if (methodName.equals("addTextListener")) {
call.replace("");
}
else if (methodName.equals("elementAt")) {
call.replace("$_ = $0 == null ? null : $0.elementAt($$);");
}
}
});
}
/**
* Augments all startsWith("http://") calls with
* || startsWith("https://").
*
* @param fullClass the class containing the method to instrument
* @param methodSig the signature of the method to instrument
*/
public void handleHTTPS(final String fullClass, final String methodSig) {
try {
final CtBehavior method = getBehavior(fullClass, methodSig);
new EagerExprEditor() {
@Override
public void edit(final MethodCall call) throws CannotCompileException {
try {
if (call.getMethodName().equals("startsWith") &&
"http://".equals(getLastConstantArgument(call, 0)))
{
call
.replace("$_ = $0.startsWith($1) || $0.startsWith(\"https://\");");
markEdited();
}
}
catch (final BadBytecode e) {
e.printStackTrace();
}
}
}.instrument(method);
}
catch (final Throwable e) {
maybeThrow(new IllegalArgumentException("Could not handle HTTPS in " +
methodSig + " in " + fullClass));
}
}
private String getLastConstantArgument(final MethodCall call, final int skip)
throws BadBytecode
{
final int[] indices = new int[skip + 1];
int counter = 0;
final MethodInfo info = ((CtMethod) call.where()).getMethodInfo();
final CodeIterator iterator = info.getCodeAttribute().iterator();
final int currentPos = call.indexOfBytecode();
while (iterator.hasNext()) {
final int pos = iterator.next();
if (pos >= currentPos) break;
switch (iterator.byteAt(pos)) {
case Opcode.LDC:
indices[(counter++) % indices.length] = iterator.byteAt(pos + 1);
break;
case Opcode.LDC_W:
indices[(counter++) % indices.length] = iterator.u16bitAt(pos + 1);
break;
}
}
if (counter < skip) {
return null;
}
counter %= indices.length;
if (skip > 0) {
counter -= skip;
if (counter < 0) counter += indices.length;
}
return info.getConstPool().getStringInfo(indices[counter]);
}
/**
* An {@link ExprEditor} that complains when it did not edit anything.
*
* @author Johannes Schindelin
*/
private abstract static class EagerExprEditor extends ExprEditor {
private int count = 0;
protected void markEdited() {
count++;
}
protected boolean wasSuccessful() {
return count > 0;
}
public void instrument(final CtBehavior behavior)
throws CannotCompileException
{
count = 0;
behavior.instrument(this);
if (!wasSuccessful()) {
throw new CannotCompileException("No code replaced!");
}
}
}
/**
* Disassembles all methods of a class.
*
* @param fullName the class name
* @param out the output stream
*/
public void disassemble(final String fullName, final PrintStream out) {
disassemble(fullName, out, false);
}
/**
* Disassembles all methods of a class, optionally including superclass
* methods.
*
* @param fullName the class name
* @param out the output stream
* @param evenSuperclassMethods whether to disassemble methods defined in
* superclasses
*/
public void disassemble(final String fullName, final PrintStream out,
final boolean evenSuperclassMethods)
{
final CtClass clazz = getClass(fullName);
out.println("Class " + clazz.getName());
for (final CtConstructor ctor : clazz.getConstructors()) {
disassemble(ctor, out);
}
for (final CtMethod method : clazz.getDeclaredMethods())
if (evenSuperclassMethods || method.getDeclaringClass().equals(clazz)) disassemble(
method, out);
}
private void disassemble(final CtBehavior method, final PrintStream out) {
out.println(method.getLongName());
final MethodInfo info = method.getMethodInfo2();
final ConstPool constPool = info.getConstPool();
final CodeAttribute code = info.getCodeAttribute();
if (code == null) return;
final CodeIterator iterator = code.iterator();
while (iterator.hasNext()) {
int pos;
try {
pos = iterator.next();
}
catch (final BadBytecode e) {
throw new RuntimeException(e);
}
out.println(pos + ": " +
InstructionPrinter.instructionString(iterator, pos, constPool));
}
out.println("");
}
/**
* Writes a .jar file with the modified classes.
*
* This comes in handy e.g. when ImageJ is to be run in an environment where
* redefining classes is not allowed. If users need to run, say, the legacy
* headless support in such an environment, they need to generate a
* headless.jar file using this method and prepend it to the class path
* (so that the classes of ij.jar are overridden by
* headless.jar's classes).
*
*
* @param path the .jar file to write to
* @throws IOException
*/
public void writeJar(final File path) throws IOException {
final JarOutputStream jar = new JarOutputStream(new FileOutputStream(path));
final DataOutputStream dataOut = new DataOutputStream(jar);
for (final CtClass clazz : handledClasses) {
if (!clazz.isModified() && !clazz.getName().startsWith("imagej.patcher.")) continue;
final ZipEntry entry =
new ZipEntry(clazz.getName().replace('.', '/') + ".class");
jar.putNextEntry(entry);
clazz.getClassFile().write(dataOut);
dataOut.flush();
}
jar.close();
}
public void writeJar(final URL directory, final File jarFile)
throws IOException, NotFoundException
{
final int prefixLength = directory.getPath().length();
final Collection urls = Utils.listContents(directory);
final byte[] buffer = new byte[16384];
final ZipOutputStream jar =
new ZipOutputStream(new FileOutputStream(jarFile));
final DataOutputStream dataOut = new DataOutputStream(jar);
for (final URL url : urls) {
final String path = url.getPath().substring(prefixLength);
final ZipEntry entry = new ZipEntry(path);
jar.putNextEntry(entry);
if (path.endsWith(".class")) {
final String classname =
path.substring(0, path.length() - 6).replace('/', '.');
final CtClass clazz = pool.get(classname);
clazz.getClassFile().write(dataOut);
handledClasses.remove(clazz);
}
else {
final InputStream in = url.openStream();
for (;;) {
int count = in.read(buffer);
if (count < 0) break;
dataOut.write(buffer, 0, count);
}
in.close();
}
dataOut.flush();
}
for (final CtClass clazz : handledClasses) {
if (!clazz.isModified() && !clazz.getName().startsWith("imagej.patcher.")) continue;
final ZipEntry entry =
new ZipEntry(clazz.getName().replace('.', '/') + ".class");
jar.putNextEntry(entry);
clazz.getClassFile().write(dataOut);
dataOut.flush();
}
jar.close();
}
private void verify(final CtClass clazz, final PrintWriter output) {
try {
final ByteArrayOutputStream stream = new ByteArrayOutputStream();
final DataOutputStream out = new DataOutputStream(stream);
clazz.getClassFile().write(out);
out.flush();
out.close();
verify(stream.toByteArray(), output);
}
catch (final Exception e) {
e.printStackTrace();
}
}
private void verify(final byte[] bytecode, final PrintWriter out) {
try {
Collection urls;
urls =
Utils.listContents(new File(System.getProperty("user.home"),
"fiji/jars/").toURI().toURL());
if (urls.size() == 0) {
urls =
Utils.listContents(new File(System.getProperty("user.home"),
"Fiji.app/jars/").toURI().toURL());
if (urls.size() == 0) {
urls =
Utils.listContents(new File("/Applications/Fiji.app/jars/")
.toURI().toURL());
}
}
final ClassLoader loader =
new java.net.URLClassLoader(urls.toArray(new URL[urls.size()]));
Class readerClass = null, checkerClass = null;
for (final String prefix : new String[] { "org.", "jruby.",
"org.jruby.org." })
{
try {
readerClass = loader.loadClass(prefix + "objectweb.asm.ClassReader");
checkerClass =
loader.loadClass(prefix + "objectweb.asm.util.CheckClassAdapter");
break;
}
catch (final ClassNotFoundException e) { /* ignore */}
}
final java.lang.reflect.Constructor ctor =
readerClass.getConstructor(new Class[] { bytecode.getClass() });
final Object reader = ctor.newInstance(bytecode);
final java.lang.reflect.Method verify =
checkerClass.getMethod("verify", new Class[] { readerClass,
Boolean.TYPE, PrintWriter.class });
verify.invoke(null, new Object[] { reader, false, out });
}
catch (final Throwable e) {
if (e.getClass().getName().endsWith(".AnalyzerException")) {
final Pattern pattern =
Pattern.compile("Error at instruction (\\d+): "
+ "Argument (\\d+): expected L([^ ,;]+);, but found L(.*);");
final Matcher matcher = pattern.matcher(e.getMessage());
if (matcher.matches()) {
final CtClass clazz1 = getClass(matcher.group(3));
final CtClass clazz2 = getClass(matcher.group(4));
try {
if (clazz2.subtypeOf(clazz1)) return;
}
catch (final NotFoundException e1) {
e1.printStackTrace();
}
}
}
e.printStackTrace();
}
}
protected void verify(final PrintWriter out) {
out.println("Verifying " + handledClasses.size() + " classes");
for (final CtClass clazz : handledClasses) {
out.println("Verifying class " + clazz.getName());
out.flush();
verify(clazz, out);
}
}
/**
* Applies legacy patches, optionally including the headless ones.
*
* Intended to be used in unit tests only, for newly-created class loaders,
* via reflection.
*
*
* @param forceHeadless also apply the headless patches
*/
@SuppressWarnings("unused")
private static void patch(final boolean forceHeadless) {
final ClassLoader loader = CodeHacker.class.getClassLoader();
new LegacyInjector().injectHooks(loader, forceHeadless);
}
/**
* Makes sure that the given class is defined in the class loader.
*
* @param clazz the class to commit
*/
public void commitClass(Class clazz) {
getClass(clazz.getName());
}
}