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• CtClassType.java

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javassist.CtClassType Maven / Gradle / Ivy

/*
 * Javassist, a Java-bytecode translator toolkit.
 * Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License.  Alternatively, the contents of this file may be used under
 * the terms of the GNU Lesser General Public License Version 2.1 or later,
 * or the Apache License Version 2.0.
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 */

package javassist;

import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javassist.bytecode.AccessFlag;
import javassist.bytecode.AnnotationsAttribute;
import javassist.bytecode.AttributeInfo;
import javassist.bytecode.BadBytecode;
import javassist.bytecode.Bytecode;
import javassist.bytecode.ClassFile;
import javassist.bytecode.CodeAttribute;
import javassist.bytecode.CodeIterator;
import javassist.bytecode.ConstPool;
import javassist.bytecode.ConstantAttribute;
import javassist.bytecode.Descriptor;
import javassist.bytecode.EnclosingMethodAttribute;
import javassist.bytecode.FieldInfo;
import javassist.bytecode.InnerClassesAttribute;
import javassist.bytecode.MethodInfo;
import javassist.bytecode.ParameterAnnotationsAttribute;
import javassist.bytecode.SignatureAttribute;
import javassist.bytecode.annotation.Annotation;
import javassist.compiler.AccessorMaker;
import javassist.compiler.CompileError;
import javassist.compiler.Javac;
import javassist.expr.ExprEditor;

/**
 * Class types.
 */
class CtClassType extends CtClass {
    ClassPool classPool;
    boolean wasChanged;
    private boolean wasFrozen;
    boolean wasPruned;
    boolean gcConstPool;    // if true, the constant pool entries will be garbage collected. 
    ClassFile classfile;
    byte[] rawClassfile;    // backup storage

    private Reference memberCache;
    private AccessorMaker accessors;

    private FieldInitLink fieldInitializers;
    private Map hiddenMethods;    // must be synchronous
    private int uniqueNumberSeed;

    private boolean doPruning = ClassPool.doPruning;
    private int getCount;
    private static final int GET_THRESHOLD = 2;     // see compress()

    CtClassType(String name, ClassPool cp) {
        super(name);
        classPool = cp;
        wasChanged = wasFrozen = wasPruned = gcConstPool = false;
        classfile = null;
        rawClassfile = null;
        memberCache = null;
        accessors = null;
        fieldInitializers = null;
        hiddenMethods = null;
        uniqueNumberSeed = 0;
        getCount = 0;
    }

    CtClassType(InputStream ins, ClassPool cp) throws IOException {
        this((String)null, cp);
        classfile = new ClassFile(new DataInputStream(ins));
        qualifiedName = classfile.getName();
    }

    CtClassType(ClassFile cf, ClassPool cp) {
        this((String)null, cp);
        classfile = cf;
        qualifiedName = classfile.getName();
    }

    @Override
    protected void extendToString(StringBuffer buffer) {
        if (wasChanged)
            buffer.append("changed ");

        if (wasFrozen)
            buffer.append("frozen ");

        if (wasPruned)
            buffer.append("pruned ");

        buffer.append(Modifier.toString(getModifiers()));
        buffer.append(" class ");
        buffer.append(getName());

        try {
            CtClass ext = getSuperclass();
            if (ext != null) {
                String name = ext.getName();
                if (!name.equals("java.lang.Object"))
                    buffer.append(" extends " + ext.getName());
            }
        }
        catch (NotFoundException e) {
            buffer.append(" extends ??");
        }

        try {
            CtClass[] intf = getInterfaces();
            if (intf.length > 0)
                buffer.append(" implements ");

            for (int i = 0; i < intf.length; ++i) {
                buffer.append(intf[i].getName());
                buffer.append(", ");
            }
        }
        catch (NotFoundException e) {
            buffer.append(" extends ??");
        }

        CtMember.Cache memCache = getMembers();
        exToString(buffer, " fields=",
                memCache.fieldHead(), memCache.lastField());
        exToString(buffer, " constructors=",
                memCache.consHead(), memCache.lastCons());
        exToString(buffer, " methods=",
                   memCache.methodHead(), memCache.lastMethod());
    }

    private void exToString(StringBuffer buffer, String msg,
                            CtMember head, CtMember tail) {
        buffer.append(msg);
        while (head != tail) {
            head = head.next();
            buffer.append(head);
            buffer.append(", ");
        }
    }

    @Override
    public AccessorMaker getAccessorMaker() {
        if (accessors == null)
            accessors = new AccessorMaker(this);

        return accessors;
    }

    @Override
    public ClassFile getClassFile2() {
        return getClassFile3(true);
    }

    public ClassFile getClassFile3(boolean doCompress) {
        ClassFile cfile = classfile;
        if (cfile != null)
            return cfile;

        if (doCompress)
            classPool.compress();

        if (rawClassfile != null) {
            try {
                ClassFile cf = new ClassFile(new DataInputStream(
                                             new ByteArrayInputStream(rawClassfile)));
                rawClassfile = null;
                getCount = GET_THRESHOLD;
                return setClassFile(cf);
            }
            catch (IOException e) {
                throw new RuntimeException(e.toString(), e);
            }
        }

        InputStream fin = null;
        try {
            fin = classPool.openClassfile(getName());
            if (fin == null)
                throw new NotFoundException(getName());

            fin = new BufferedInputStream(fin);
            ClassFile cf = new ClassFile(new DataInputStream(fin));
            if (!cf.getName().equals(qualifiedName))
                throw new RuntimeException("cannot find " + qualifiedName + ": " 
                        + cf.getName() + " found in "
                        + qualifiedName.replace('.', '/') + ".class");

            return setClassFile(cf);
        }
        catch (NotFoundException e) {
            throw new RuntimeException(e.toString(), e);
        }
        catch (IOException e) {
            throw new RuntimeException(e.toString(), e);
        }
        finally {
            if (fin != null)
                try {
                    fin.close();
                }
                catch (IOException e) {}
        }
    }

   /* Inherited from CtClass.  Called by get() in ClassPool.
    *
    * @see javassist.CtClass#incGetCounter()
    * @see #toBytecode(DataOutputStream)
    */
    @Override
   final void incGetCounter() { ++getCount; }

   /**
    * Invoked from ClassPool#compress().
    * It releases the class files that have not been recently used
    * if they are unmodified. 
    */
    @Override
   void compress() {
       if (getCount < GET_THRESHOLD)
           if (!isModified() && ClassPool.releaseUnmodifiedClassFile)
               removeClassFile();
           else if (isFrozen() && !wasPruned)
               saveClassFile();

       getCount = 0;
   }

   /**
     * Converts a ClassFile object into a byte array
     * for saving memory space.
     */
    private synchronized void saveClassFile() {
        /* getMembers() and removeClassFile() are also synchronized.
         */
        if (classfile == null || hasMemberCache() != null)
            return;

        ByteArrayOutputStream barray = new ByteArrayOutputStream();
        DataOutputStream out = new DataOutputStream(barray);
        try {
            classfile.write(out);
            barray.close();
            rawClassfile = barray.toByteArray();
            classfile = null;
        }
        catch (IOException e) {}
    }

    private synchronized void removeClassFile() {
        if (classfile != null && !isModified() && hasMemberCache() == null)
            classfile = null;
    }

    /**
     * Updates {@code classfile} if it is null.
     */
    private synchronized ClassFile setClassFile(ClassFile cf) {
        if (classfile == null)
            classfile = cf;

        return classfile;
    }

    @Override
    public ClassPool getClassPool() { return classPool; }

    void setClassPool(ClassPool cp) { classPool = cp; }

    @Override
    public URL getURL() throws NotFoundException {
        URL url = classPool.find(getName());
        if (url == null)
            throw new NotFoundException(getName());
        return url;
    }

    @Override
    public boolean isModified() { return wasChanged; }

    @Override
    public boolean isFrozen() { return wasFrozen; }

    @Override
    public void freeze() { wasFrozen = true; }

    @Override
    void checkModify() throws RuntimeException {
        if (isFrozen()) {
            String msg = getName() + " class is frozen";
            if (wasPruned)
                msg += " and pruned";

            throw new RuntimeException(msg);
        }

        wasChanged = true;
    }

    @Override
    public void defrost() {
        checkPruned("defrost");
        wasFrozen = false;
    }

    @Override
    public boolean subtypeOf(CtClass clazz) throws NotFoundException {
        int i;
        String cname = clazz.getName();
        if (this == clazz || getName().equals(cname))
            return true;

        ClassFile file = getClassFile2();
        String supername = file.getSuperclass();
        if (supername != null && supername.equals(cname))
            return true;

        String[] ifs = file.getInterfaces();
        int num = ifs.length;
        for (i = 0; i < num; ++i)
            if (ifs[i].equals(cname))
                return true;

        if (supername != null && classPool.get(supername).subtypeOf(clazz))
            return true;

        for (i = 0; i < num; ++i)
            if (classPool.get(ifs[i]).subtypeOf(clazz))
                return true;

        return false;
    }

    @Override
    public void setName(String name) throws RuntimeException {
        String oldname = getName();
        if (name.equals(oldname))
            return;

        // check this in advance although classNameChanged() below does.
        classPool.checkNotFrozen(name);
        ClassFile cf = getClassFile2();
        super.setName(name);
        cf.setName(name);
        nameReplaced();
        classPool.classNameChanged(oldname, this);
    }

    @Override
    public String getGenericSignature() {
        SignatureAttribute sa
            = (SignatureAttribute)getClassFile2().getAttribute(SignatureAttribute.tag);
        return sa == null ? null : sa.getSignature();
    }

    @Override
    public void setGenericSignature(String sig) {
        ClassFile cf = getClassFile();
        SignatureAttribute sa = new SignatureAttribute(cf.getConstPool(), sig);
        cf.addAttribute(sa);
    }

    @Override
    public void replaceClassName(ClassMap classnames)
        throws RuntimeException
    {
        String oldClassName = getName();
        String newClassName
            = classnames.get(Descriptor.toJvmName(oldClassName));
        if (newClassName != null) {
            newClassName = Descriptor.toJavaName(newClassName);
            // check this in advance although classNameChanged() below does.
            classPool.checkNotFrozen(newClassName);
        }

        super.replaceClassName(classnames);
        ClassFile cf = getClassFile2();
        cf.renameClass(classnames);
        nameReplaced();

        if (newClassName != null) {
            super.setName(newClassName);
            classPool.classNameChanged(oldClassName, this);
        }
    }

    @Override
    public void replaceClassName(String oldname, String newname)
        throws RuntimeException
    {
        String thisname = getName();
        if (thisname.equals(oldname))
            setName(newname);
        else {
            super.replaceClassName(oldname, newname);
            getClassFile2().renameClass(oldname, newname);
            nameReplaced();
        }
    }

    @Override
    public boolean isInterface() {
        return Modifier.isInterface(getModifiers());
    }

    @Override
    public boolean isAnnotation() {
        return Modifier.isAnnotation(getModifiers());
    }

    @Override
    public boolean isEnum() {
       return Modifier.isEnum(getModifiers());
    }

    @Override
    public int getModifiers() {
        ClassFile cf = getClassFile2();
        int acc = cf.getAccessFlags();
        acc = AccessFlag.clear(acc, AccessFlag.SUPER);
        int inner = cf.getInnerAccessFlags();
        if (inner != -1) {
            if ((inner & AccessFlag.STATIC) != 0)
                acc |= AccessFlag.STATIC;
            if ((inner & AccessFlag.PUBLIC) != 0)
                acc |= AccessFlag.PUBLIC;
            else {
                acc &= ~AccessFlag.PUBLIC; //clear PUBLIC
                if ((inner & AccessFlag.PROTECTED) != 0)
                    acc |= AccessFlag.PROTECTED;
                else if ((inner & AccessFlag.PRIVATE) != 0)
                    acc |= AccessFlag.PRIVATE;
            }
        }
        return AccessFlag.toModifier(acc);
    }

    @Override
    public CtClass[] getNestedClasses() throws NotFoundException {
        ClassFile cf = getClassFile2();
        InnerClassesAttribute ica
            = (InnerClassesAttribute)cf.getAttribute(InnerClassesAttribute.tag);
        if (ica == null)
            return new CtClass[0];

        String thisName = cf.getName() + "$";
        int n = ica.tableLength();
        List list = new ArrayList(n);
        for (int i = 0; i < n; i++) {
            String name = ica.innerClass(i);
            if (name != null)
                if (name.startsWith(thisName)) {
                    // if it is an immediate nested class
                    if (name.lastIndexOf('$') < thisName.length())
                        list.add(classPool.get(name));
                }
        }

        return list.toArray(new CtClass[list.size()]);
    }

    @Override
    public void setModifiers(int mod) {
        checkModify();
        updateInnerEntry(mod, getName(), this, true);
        ClassFile cf = getClassFile2();
        cf.setAccessFlags(AccessFlag.of(mod & ~Modifier.STATIC));
    }

    private static void updateInnerEntry(int newMod, String name, CtClass clazz, boolean outer) {
        ClassFile cf = clazz.getClassFile2();
        InnerClassesAttribute ica
            = (InnerClassesAttribute)cf.getAttribute(InnerClassesAttribute.tag);
        if (ica != null) {
            // If the class is a static inner class, its modifier
            // does not contain the static bit.  Its inner class attribute
            // contains the static bit.
            int mod = newMod & ~Modifier.STATIC;
            int i = ica.find(name);
            if (i >= 0) {
                int isStatic = ica.accessFlags(i) & AccessFlag.STATIC;
                if (isStatic != 0 || !Modifier.isStatic(newMod)) {
                    clazz.checkModify();
                    ica.setAccessFlags(i, AccessFlag.of(mod) | isStatic);
                    String outName = ica.outerClass(i);
                    if (outName != null && outer)
                        try {
                            CtClass parent = clazz.getClassPool().get(outName);
                            updateInnerEntry(mod, name, parent, false);
                        }
                        catch (NotFoundException e) {
                            throw new RuntimeException("cannot find the declaring class: "
                                                       + outName);
                        }

                    return;
                }
            }
        }

        if (Modifier.isStatic(newMod))
            throw new RuntimeException("cannot change " + Descriptor.toJavaName(name)
                                       + " into a static class");
    }

    @Override
    public boolean hasAnnotation(String annotationName) {
        ClassFile cf = getClassFile2();
        AnnotationsAttribute ainfo = (AnnotationsAttribute)
                cf.getAttribute(AnnotationsAttribute.invisibleTag);
        AnnotationsAttribute ainfo2 = (AnnotationsAttribute)
                cf.getAttribute(AnnotationsAttribute.visibleTag);
        return hasAnnotationType(annotationName, getClassPool(), ainfo, ainfo2);
    }

    /**
     * @deprecated
     */
    @Deprecated
    static boolean hasAnnotationType(Class clz, ClassPool cp,
                                     AnnotationsAttribute a1,
                                     AnnotationsAttribute a2)
    {
        return hasAnnotationType(clz.getName(), cp, a1, a2);
    }

    static boolean hasAnnotationType(String annotationTypeName, ClassPool cp,
                                     AnnotationsAttribute a1,
                                     AnnotationsAttribute a2)
    {
        Annotation[] anno1, anno2;

        if (a1 == null)
            anno1 = null;
        else
            anno1 = a1.getAnnotations();

        if (a2 == null)
            anno2 = null;
        else
            anno2 = a2.getAnnotations();

        if (anno1 != null)
            for (int i = 0; i < anno1.length; i++)
                if (anno1[i].getTypeName().equals(annotationTypeName))
                    return true;

        if (anno2 != null)
            for (int i = 0; i < anno2.length; i++)
                if (anno2[i].getTypeName().equals(annotationTypeName))
                    return true;

        return false;
    }

    @Override
    public Object getAnnotation(Class clz) throws ClassNotFoundException {
        ClassFile cf = getClassFile2();
        AnnotationsAttribute ainfo = (AnnotationsAttribute)
                cf.getAttribute(AnnotationsAttribute.invisibleTag);  
        AnnotationsAttribute ainfo2 = (AnnotationsAttribute)
                cf.getAttribute(AnnotationsAttribute.visibleTag);  
        return getAnnotationType(clz, getClassPool(), ainfo, ainfo2);
    }

    static Object getAnnotationType(Class clz, ClassPool cp,
                                    AnnotationsAttribute a1, AnnotationsAttribute a2)
        throws ClassNotFoundException
    {
        Annotation[] anno1, anno2;

        if (a1 == null)
            anno1 = null;
        else
            anno1 = a1.getAnnotations();

        if (a2 == null)
            anno2 = null;
        else
            anno2 = a2.getAnnotations();

        String typeName = clz.getName();
        if (anno1 != null)
           for (int i = 0; i < anno1.length; i++)
              if (anno1[i].getTypeName().equals(typeName))
                  return toAnnoType(anno1[i], cp);

        if (anno2 != null)
           for (int i = 0; i < anno2.length; i++)
              if (anno2[i].getTypeName().equals(typeName))
                  return toAnnoType(anno2[i], cp);

        return null;
    }

    @Override
    public Object[] getAnnotations() throws ClassNotFoundException {
       return getAnnotations(false);
    }

    @Override
    public Object[] getAvailableAnnotations(){
       try {
           return getAnnotations(true);
       }
       catch (ClassNotFoundException e) {
           throw new RuntimeException("Unexpected exception ", e);
       }
    }

    private Object[] getAnnotations(boolean ignoreNotFound)
        throws ClassNotFoundException
    {
        ClassFile cf = getClassFile2();
        AnnotationsAttribute ainfo = (AnnotationsAttribute)
                cf.getAttribute(AnnotationsAttribute.invisibleTag);  
        AnnotationsAttribute ainfo2 = (AnnotationsAttribute)
                cf.getAttribute(AnnotationsAttribute.visibleTag);  
        return toAnnotationType(ignoreNotFound, getClassPool(), ainfo, ainfo2);
    }

    static Object[] toAnnotationType(boolean ignoreNotFound, ClassPool cp,
                             AnnotationsAttribute a1, AnnotationsAttribute a2)
        throws ClassNotFoundException
    {
        Annotation[] anno1, anno2;
        int size1, size2;

        if (a1 == null) {
            anno1 = null;
            size1 = 0;
        }
        else {
            anno1 = a1.getAnnotations();
            size1 = anno1.length;
        }

        if (a2 == null) {
            anno2 = null;
            size2 = 0;
        }
        else {
            anno2 = a2.getAnnotations();
            size2 = anno2.length;
        }

        if (!ignoreNotFound){
           Object[] result = new Object[size1 + size2];
           for (int i = 0; i < size1; i++)
               result[i] = toAnnoType(anno1[i], cp);
   
           for (int j = 0; j < size2; j++)
               result[j + size1] = toAnnoType(anno2[j], cp);
   
           return result;
        }
       List