Java Code Examples for org.apache.bcel.classfile.Utility

The following examples show how to use org.apache.bcel.classfile.Utility. These examples are extracted from open source projects. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source Project: commons-bcel   Source File: JasminVisitor.java    License: Apache License 2.0 6 votes vote down vote up
@Override
public void visitJavaClass(final JavaClass clazz) {
    out.println(";; Produced by JasminVisitor (BCEL)");
    out.println(";; https://commons.apache.org/bcel/");
    out.println(";; " + new Date() + "\n");

    out.println(".source " + clazz.getSourceFileName());
    out.println("." + Utility.classOrInterface(clazz.getAccessFlags()) + " " +
            Utility.accessToString(clazz.getAccessFlags(), true) +
            " " + clazz.getClassName().replace('.', '/'));
    out.println(".super " + clazz.getSuperclassName().replace('.', '/'));

    for (final String iface : clazz.getInterfaceNames()) {
        out.println(".implements " + iface.replace('.', '/'));
    }

    out.print("\n");
}
 
Example 2
Source Project: commons-bcel   Source File: FieldGen.java    License: Apache License 2.0 6 votes vote down vote up
/**
 * Return string representation close to declaration format,
 * `public static final short MAX = 100', e.g..
 *
 * @return String representation of field
 */
@Override
public final String toString() {
    String name;
    String signature;
    String access; // Short cuts to constant pool
    access = Utility.accessToString(super.getAccessFlags());
    access = access.isEmpty() ? "" : (access + " ");
    signature = super.getType().toString();
    name = getName();
    final StringBuilder buf = new StringBuilder(32); // CHECKSTYLE IGNORE MagicNumber
    buf.append(access).append(signature).append(" ").append(name);
    final String value = getInitValue();
    if (value != null) {
        buf.append(" = ").append(value);
    }
    return buf.toString();
}
 
Example 3
Source Project: commons-bcel   Source File: MethodGen.java    License: Apache License 2.0 6 votes vote down vote up
/**
 * Return string representation close to declaration format,
 * `public static void main(String[]) throws IOException', e.g.
 *
 * @return String representation of the method.
 */
@Override
public final String toString() {
    final String access = Utility.accessToString(super.getAccessFlags());
    String signature = Type.getMethodSignature(super.getType(), argTypes);
    signature = Utility.methodSignatureToString(signature, super.getName(), access, true,
            getLocalVariableTable(super.getConstantPool()));
    final StringBuilder buf = new StringBuilder(signature);
    for (final Attribute a : getAttributes()) {
        if (!((a instanceof Code) || (a instanceof ExceptionTable))) {
            buf.append(" [").append(a).append("]");
        }
    }

    if (throwsList.size() > 0) {
        for (final String throwsDescriptor : throwsList) {
            buf.append("\n\t\tthrows ").append(throwsDescriptor);
        }
    }
    return buf.toString();
}
 
Example 4
Source Project: commons-bcel   Source File: Type.java    License: Apache License 2.0 6 votes vote down vote up
static int getTypeSize( final String signature ) throws StringIndexOutOfBoundsException {
    final byte type = Utility.typeOfSignature(signature);
    if (type <= Const.T_VOID) {
        return encode(BasicType.getType(type).getSize(), 1);
    } else if (type == Const.T_ARRAY) {
        int dim = 0;
        do { // Count dimensions
            dim++;
        } while (signature.charAt(dim) == '[');
        // Recurse, but just once, if the signature is ok
        final int consumed = consumed(getTypeSize(signature.substring(dim)));
        return encode(1, dim + consumed);
    } else { // type == T_REFERENCE
        final int index = signature.indexOf(';'); // Look for closing `;'
        if (index < 0) {
            throw new ClassFormatException("Invalid signature: " + signature);
        }
        return encode(1, index + 1);
    }
}
 
Example 5
Source Project: commons-bcel   Source File: ClassLoader.java    License: Apache License 2.0 6 votes vote down vote up
/**
 * Override this method to create you own classes on the fly. The
 * name contains the special token $$BCEL$$. Everything before that
 * token is considered to be a package name. You can encode your own
 * arguments into the subsequent string. You must ensure however not
 * to use any "illegal" characters, i.e., characters that may not
 * appear in a Java class name too
 * <p>
 * The default implementation interprets the string as a encoded compressed
 * Java class, unpacks and decodes it with the Utility.decode() method, and
 * parses the resulting byte array and returns the resulting JavaClass object.
 * </p>
 *
 * @param class_name compressed byte code with "$$BCEL$$" in it
 */
protected JavaClass createClass( final String class_name ) {
    final int index = class_name.indexOf(BCEL_TOKEN);
    final String real_name = class_name.substring(index + BCEL_TOKEN.length());
    JavaClass clazz = null;
    try {
        final byte[] bytes = Utility.decode(real_name, true);
        final ClassParser parser = new ClassParser(new ByteArrayInputStream(bytes), "foo");
        clazz = parser.parse();
    } catch (final IOException e) {
        e.printStackTrace();
        return null;
    }
    // Adapt the class name to the passed value
    final ConstantPool cp = clazz.getConstantPool();
    final ConstantClass cl = (ConstantClass) cp.getConstant(clazz.getClassNameIndex(),
            Const.CONSTANT_Class);
    final ConstantUtf8 name = (ConstantUtf8) cp.getConstant(cl.getNameIndex(),
            Const.CONSTANT_Utf8);
    name.setBytes(class_name.replace('.', '/'));
    return clazz;
}
 
Example 6
Source Project: commons-bcel   Source File: MethodHTML.java    License: Apache License 2.0 6 votes vote down vote up
/**
 * Print field of class.
 *
 * @param field field to print
 * @throws java.io.IOException
 */
private void writeField( final Field field ) throws IOException {
    final String type = Utility.signatureToString(field.getSignature());
    final String name = field.getName();
    String access = Utility.accessToString(field.getAccessFlags());
    Attribute[] attributes;
    access = Utility.replace(access, " ", "&nbsp;");
    file.print("<TR><TD><FONT COLOR=\"#FF0000\">" + access + "</FONT></TD>\n<TD>"
            + Class2HTML.referenceType(type) + "</TD><TD><A NAME=\"field" + name + "\">" + name
            + "</A></TD>");
    attributes = field.getAttributes();
    // Write them to the Attributes.html file with anchor "<name>[<i>]"
    for (int i = 0; i < attributes.length; i++) {
        attribute_html.writeAttribute(attributes[i], name + "@" + i);
    }
    for (int i = 0; i < attributes.length; i++) {
        if (attributes[i].getTag() == Const.ATTR_CONSTANT_VALUE) { // Default value
            final String str = ((ConstantValue) attributes[i]).toString();
            // Reference attribute in _attributes.html
            file.print("<TD>= <A HREF=\"" + className + "_attributes.html#" + name + "@" + i
                    + "\" TARGET=\"Attributes\">" + str + "</TD>\n");
            break;
        }
    }
    file.println("</TR>");
}
 
Example 7
Source Project: commons-bcel   Source File: BCELFactory.java    License: Apache License 2.0 6 votes vote down vote up
private void createConstant( final Object value ) {
    String embed = value.toString();
    if (value instanceof String) {
        embed = '"' + Utility.convertString(embed) + '"';
    } else if (value instanceof Character) {
        embed = "(char)0x" + Integer.toHexString(((Character) value).charValue());
    } else if (value instanceof Float) {
        embed += "f";
    } else if (value instanceof Long) {
        embed += "L";
    } else if (value instanceof ObjectType) {
        final ObjectType ot = (ObjectType) value;
        embed = "new ObjectType(\""+ot.getClassName()+"\")";
    }

    _out.println("il.append(new PUSH(_cp, " + embed + "));");
}
 
Example 8
Source Project: commons-bcel   Source File: BCELifier.java    License: Apache License 2.0 6 votes vote down vote up
@Override
public void visitMethod( final Method method ) {
    final MethodGen mg = new MethodGen(method, _clazz.getClassName(), _cp);
    _out.println("    InstructionList il = new InstructionList();");
    _out.println("    MethodGen method = new MethodGen("
            + printFlags(method.getAccessFlags(), FLAGS.METHOD) + ", "
            + printType(mg.getReturnType()) + ", "
            + printArgumentTypes(mg.getArgumentTypes()) + ", "
            + "new String[] { " + Utility.printArray(mg.getArgumentNames(), false, true)
            + " }, \"" + method.getName() + "\", \"" + _clazz.getClassName() + "\", il, _cp);");
    _out.println();
    final BCELFactory factory = new BCELFactory(mg, _out);
    factory.start();
    _out.println("    method.setMaxStack();");
    _out.println("    method.setMaxLocals();");
    _out.println("    _cg.addMethod(method.getMethod());");
    _out.println("    il.dispose();");
}
 
Example 9
Source Project: commons-bcel   Source File: BCELifier.java    License: Apache License 2.0 6 votes vote down vote up
static String printType( final String signature ) {
    final Type type = Type.getType(signature);
    final byte t = type.getType();
    if (t <= Const.T_VOID) {
        return "Type." + Const.getTypeName(t).toUpperCase(Locale.ENGLISH);
    } else if (type.toString().equals("java.lang.String")) {
        return "Type.STRING";
    } else if (type.toString().equals("java.lang.Object")) {
        return "Type.OBJECT";
    } else if (type.toString().equals("java.lang.StringBuffer")) {
        return "Type.STRINGBUFFER";
    } else if (type instanceof ArrayType) {
        final ArrayType at = (ArrayType) type;
        return "new ArrayType(" + printType(at.getBasicType()) + ", " + at.getDimensions()
                + ")";
    } else {
        return "new ObjectType(\"" + Utility.signatureToString(signature, false) + "\")";
    }
}
 
Example 10
Source Project: cloud-opensource-java   Source File: MethodSymbol.java    License: Apache License 2.0 5 votes vote down vote up
@Override
public String toString() {
  // https://docs.oracle.com/javase/specs/jls/se8/html/jls-8.html#jls-8.4.2
  String signaturePlusReturnType = Utility.methodSignatureToString(descriptor, name, "");
  String signature = signaturePlusReturnType.substring(signaturePlusReturnType.indexOf(' ') + 1);
  return (isInterfaceMethod ? "Interface " : "") + getClassBinaryName() + "'s method " + signature;
}
 
Example 11
Source Project: ApkToolPlus   Source File: BCELFactory.java    License: Apache License 2.0 5 votes vote down vote up
private void createConstant(Object value) {
  String embed = value.toString();

  if(value instanceof String)
    embed = '"' + Utility.convertString(value.toString()) + '"';
  else if(value instanceof Character)
    embed = "(char)0x" + Integer.toHexString(((Character)value).charValue());

  _out.println("il.append(new PUSH(_cp, " + embed + "));");
}
 
Example 12
Source Project: commons-bcel   Source File: JasminVisitor.java    License: Apache License 2.0 5 votes vote down vote up
@Override
public void visitField(final Field field) {
    out.print(".field " + Utility.accessToString(field.getAccessFlags()) +
            " \"" + field.getName() + "\"" + field.getSignature());
    if (field.getAttributes().length == 0) {
        out.print("\n");
    }
}
 
Example 13
Source Project: commons-bcel   Source File: JasminVisitor.java    License: Apache License 2.0 5 votes vote down vote up
@Override
public void visitMethod(final Method method) {
    this._method = method; // Remember for use in subsequent visitXXX calls

    out.println("\n.method " + Utility.accessToString(_method.getAccessFlags()) +
            " " + _method.getName() + _method.getSignature());

    final Attribute[] attributes = _method.getAttributes();
    if ((attributes == null) || (attributes.length == 0)) {
        out.println(".end method");
    }
}
 
Example 14
Source Project: commons-bcel   Source File: Type.java    License: Apache License 2.0 5 votes vote down vote up
/**
 * Convert signature to a Type object.
 * @param signature signature string such as Ljava/lang/String;
 * @return type object
 */
// @since 6.0 no longer final
public static Type getType( final String signature ) throws StringIndexOutOfBoundsException {
    final byte type = Utility.typeOfSignature(signature);
    if (type <= Const.T_VOID) {
        //corrected concurrent private static field acess
        wrap(consumed_chars, 1);
        return BasicType.getType(type);
    } else if (type == Const.T_ARRAY) {
        int dim = 0;
        do { // Count dimensions
            dim++;
        } while (signature.charAt(dim) == '[');
        // Recurse, but just once, if the signature is ok
        final Type t = getType(signature.substring(dim));
        //corrected concurrent private static field acess
        //  consumed_chars += dim; // update counter - is replaced by
        final int _temp = unwrap(consumed_chars) + dim;
        wrap(consumed_chars, _temp);
        return new ArrayType(t, dim);
    } else { // type == T_REFERENCE
        // Utility.typeSignatureToString understands how to parse generic types.
        final String parsedSignature = Utility.typeSignatureToString(signature, false);
        wrap(consumed_chars, parsedSignature.length() + 2); // "Lblabla;" `L' and `;' are removed
        return ObjectType.getInstance(parsedSignature.replace('/', '.'));
    }
}
 
Example 15
Source Project: commons-bcel   Source File: Class2HTML.java    License: Apache License 2.0 5 votes vote down vote up
/**
 * Utility method that converts a class reference in the constant pool,
 * i.e., an index to a string.
 */
static String referenceClass( final int index ) {
    String str = constant_pool.getConstantString(index, Const.CONSTANT_Class);
    str = Utility.compactClassName(str);
    str = Utility.compactClassName(str, class_package + ".", true);
    return "<A HREF=\"" + class_name + "_cp.html#cp" + index + "\" TARGET=ConstantPool>" + str
            + "</A>";
}
 
Example 16
Source Project: commons-bcel   Source File: Class2HTML.java    License: Apache License 2.0 5 votes vote down vote up
static String referenceType( final String type ) {
    String short_type = Utility.compactClassName(type);
    short_type = Utility.compactClassName(short_type, class_package + ".", true);
    final int index = type.indexOf('['); // Type is an array?
    String base_type = type;
    if (index > -1) {
        base_type = type.substring(0, index); // Tack of the `['
    }
    // test for basic type
    if (basic_types.contains(base_type)) {
        return "<FONT COLOR=\"#00FF00\">" + type + "</FONT>";
    }
    return "<A HREF=\"" + base_type + ".html\" TARGET=_top>" + short_type + "</A>";
}
 
Example 17
Source Project: ApkToolPlus   Source File: InstructionHandle.java    License: Apache License 2.0 4 votes vote down vote up
/** @return a (verbose) string representation of the contained instruction. 
 */
public String toString(boolean verbose) {
  return Utility.format(i_position, 4, false, ' ') + ": " + instruction.toString(verbose);
}
 
Example 18
Source Project: commons-bcel   Source File: helloify.java    License: Apache License 2.0 4 votes vote down vote up
/**
 * Patch a method.
 */
private static Method helloifyMethod(Method m) {
    final Code code = m.getCode();
    final int flags = m.getAccessFlags();
    final String name = m.getName();

    // Sanity check
    if (m.isNative() || m.isAbstract() || (code == null)) {
        return m;
    }

    // Create instruction list to be inserted at method start.
    final String mesg = "Hello from " + Utility.methodSignatureToString(m.getSignature(),
            name,
            Utility.accessToString(flags));
    final InstructionList patch = new InstructionList();
    patch.append(new GETSTATIC(out));
    patch.append(new PUSH(cp, mesg));
    patch.append(new INVOKEVIRTUAL(println));

    final MethodGen mg = new MethodGen(m, class_name, cp);
    final InstructionList il = mg.getInstructionList();
    final InstructionHandle[] ihs = il.getInstructionHandles();

    if (name.equals("<init>")) { // First let the super or other constructor be called
        for (int j = 1; j < ihs.length; j++) {
            if (ihs[j].getInstruction() instanceof INVOKESPECIAL) {
                il.append(ihs[j], patch); // Should check: method name == "<init>"
                break;
            }
        }
    } else {
        il.insert(ihs[0], patch);
    }

    // Stack size must be at least 2, since the println method takes 2 argument.
    if (code.getMaxStack() < 2) {
        mg.setMaxStack(2);
    }

    m = mg.getMethod();

    il.dispose(); // Reuse instruction handles

    return m;
}
 
Example 19
Source Project: commons-bcel   Source File: ProxyCreator.java    License: Apache License 2.0 4 votes vote down vote up
/**
 * Create JavaClass object for a simple proxy for an java.awt.event.ActionListener
 * that just prints the passed arguments, load and use it via the class loader
 * mechanism.
 */
public static void main(final String[] argv) throws Exception {
    final ClassLoader loader = ProxyCreator.class.getClassLoader();

    // instanceof won't work here ...
    // TODO this is broken; cannot ever be true now that ClassLoader has been dropped
    if (loader.getClass().toString().equals("class org.apache.bcel.util.ClassLoader")) {
        // Real class name will be set by the class loader
        final ClassGen cg = new ClassGen("foo", "java.lang.Object", "", Constants.ACC_PUBLIC,
                new String[]{"java.awt.event.ActionListener"});

        // That's important, otherwise newInstance() won't work
        cg.addEmptyConstructor(Constants.ACC_PUBLIC);

        final InstructionList il = new InstructionList();
        final ConstantPoolGen cp = cg.getConstantPool();
        final InstructionFactory factory = new InstructionFactory(cg);

        final int out = cp.addFieldref("java.lang.System", "out",
                "Ljava/io/PrintStream;");
        final int println = cp.addMethodref("java.io.PrintStream", "println",
                "(Ljava/lang/Object;)V");
        final MethodGen mg = new MethodGen(Constants.ACC_PUBLIC, Type.VOID,
                new Type[]{
                        new ObjectType("java.awt.event.ActionEvent")
                }, null, "actionPerformed", "foo", il, cp);

        // System.out.println("actionPerformed:" + event);
        il.append(new GETSTATIC(out));
        il.append(factory.createNew("java.lang.StringBuffer"));
        il.append(InstructionConstants.DUP);
        il.append(new PUSH(cp, "actionPerformed:"));
        il.append(factory.createInvoke("java.lang.StringBuffer", "<init>", Type.VOID,
                new Type[]{Type.STRING}, Constants.INVOKESPECIAL));

        il.append(new ALOAD(1));
        il.append(factory.createAppend(Type.OBJECT));
        il.append(new INVOKEVIRTUAL(println));
        il.append(InstructionConstants.RETURN);

        mg.stripAttributes(true);
        mg.setMaxStack();
        mg.setMaxLocals();
        cg.addMethod(mg.getMethod());

        final byte[] bytes = cg.getJavaClass().getBytes();

        System.out.println("Uncompressed class: " + bytes.length);

        final String s = Utility.encode(bytes, true);
        System.out.println("Encoded class: " + s.length());

        System.out.print("Creating proxy ... ");
        final ActionListener a = (ActionListener) createProxy("foo.bar.", s);
        System.out.println("Done. Now calling actionPerformed()");

        a.actionPerformed(new ActionEvent(a, ActionEvent.ACTION_PERFORMED, "hello"));
    } else {
        System.err.println("Call me with java org.apache.bcel.util.JavaWrapper ProxyCreator");
    }
}
 
Example 20
Source Project: commons-bcel   Source File: InstructionHandle.java    License: Apache License 2.0 4 votes vote down vote up
/** @return a (verbose) string representation of the contained instruction.
 */
public String toString( final boolean verbose ) {
    return Utility.format(i_position, 4, false, ' ') + ": " + instruction.toString(verbose);
}
 
Example 21
Source Project: commons-bcel   Source File: Type.java    License: Apache License 2.0 4 votes vote down vote up
/**
 * @return Type string, e.g. `int[]'
 */
@Override
public String toString() {
    return ((this.equals(Type.NULL) || (type >= Const.T_UNKNOWN))) ? signature : Utility
            .signatureToString(signature, false);
}
 
Example 22
Source Project: commons-bcel   Source File: MethodHTML.java    License: Apache License 2.0 4 votes vote down vote up
private void writeMethod( final Method method, final int method_number ) {
    // Get raw signature
    final String signature = method.getSignature();
    // Get array of strings containing the argument types
    final String[] args = Utility.methodSignatureArgumentTypes(signature, false);
    // Get return type string
    final String type = Utility.methodSignatureReturnType(signature, false);
    // Get method name
    final String name = method.getName();
    String html_name;
    // Get method's access flags
    String access = Utility.accessToString(method.getAccessFlags());
    // Get the method's attributes, the Code Attribute in particular
    final Attribute[] attributes = method.getAttributes();
    /* HTML doesn't like names like <clinit> and spaces are places to break
     * lines. Both we don't want...
     */
    access = Utility.replace(access, " ", "&nbsp;");
    html_name = Class2HTML.toHTML(name);
    file.print("<TR VALIGN=TOP><TD><FONT COLOR=\"#FF0000\"><A NAME=method" + method_number
            + ">" + access + "</A></FONT></TD>");
    file.print("<TD>" + Class2HTML.referenceType(type) + "</TD><TD>" + "<A HREF=" + className
            + "_code.html#method" + method_number + " TARGET=Code>" + html_name
            + "</A></TD>\n<TD>(");
    for (int i = 0; i < args.length; i++) {
        file.print(Class2HTML.referenceType(args[i]));
        if (i < args.length - 1) {
            file.print(", ");
        }
    }
    file.print(")</TD></TR>");
    // Check for thrown exceptions
    for (int i = 0; i < attributes.length; i++) {
        attribute_html.writeAttribute(attributes[i], "method" + method_number + "@" + i,
                method_number);
        final byte tag = attributes[i].getTag();
        if (tag == Const.ATTR_EXCEPTIONS) {
            file.print("<TR VALIGN=TOP><TD COLSPAN=2></TD><TH ALIGN=LEFT>throws</TH><TD>");
            final int[] exceptions = ((ExceptionTable) attributes[i]).getExceptionIndexTable();
            for (int j = 0; j < exceptions.length; j++) {
                file.print(constantHtml.referenceConstant(exceptions[j]));
                if (j < exceptions.length - 1) {
                    file.print(", ");
                }
            }
            file.println("</TD></TR>");
        } else if (tag == Const.ATTR_CODE) {
            final Attribute[] c_a = ((Code) attributes[i]).getAttributes();
            for (int j = 0; j < c_a.length; j++) {
                attribute_html.writeAttribute(c_a[j], "method" + method_number + "@" + i + "@"
                        + j, method_number);
            }
        }
    }
}
 
Example 23
Source Project: commons-bcel   Source File: BCELifier.java    License: Apache License 2.0 4 votes vote down vote up
@Override
public void visitJavaClass( final JavaClass clazz ) {
    String class_name = clazz.getClassName();
    final String super_name = clazz.getSuperclassName();
    final String package_name = clazz.getPackageName();
    final String inter = Utility.printArray(clazz.getInterfaceNames(), false, true);
    if (!"".equals(package_name)) {
        class_name = class_name.substring(package_name.length() + 1);
        _out.println("package " + package_name + ";");
        _out.println();
    }
    _out.println("import " + BASE_PACKAGE + ".generic.*;");
    _out.println("import " + BASE_PACKAGE + ".classfile.*;");
    _out.println("import " + BASE_PACKAGE + ".*;");
    _out.println("import java.io.*;");
    _out.println();
    _out.println("public class " + class_name + "Creator {");
    _out.println("  private InstructionFactory _factory;");
    _out.println("  private ConstantPoolGen    _cp;");
    _out.println("  private ClassGen           _cg;");
    _out.println();
    _out.println("  public " + class_name + "Creator() {");
    _out.println("    _cg = new ClassGen(\""
            + (("".equals(package_name)) ? class_name : package_name + "." + class_name)
            + "\", \"" + super_name + "\", " + "\"" + clazz.getSourceFileName() + "\", "
            + printFlags(clazz.getAccessFlags(), FLAGS.CLASS) + ", "
            + "new String[] { " + inter + " });");
    _out.println("    _cg.setMajor(" + clazz.getMajor() +");");
    _out.println("    _cg.setMinor(" + clazz.getMinor() +");");
    _out.println();
    _out.println("    _cp = _cg.getConstantPool();");
    _out.println("    _factory = new InstructionFactory(_cg, _cp);");
    _out.println("  }");
    _out.println();
    printCreate();
    final Field[] fields = clazz.getFields();
    if (fields.length > 0) {
        _out.println("  private void createFields() {");
        _out.println("    FieldGen field;");
        for (final Field field : fields) {
            field.accept(this);
        }
        _out.println("  }");
        _out.println();
    }
    final Method[] methods = clazz.getMethods();
    for (int i = 0; i < methods.length; i++) {
        _out.println("  private void createMethod_" + i + "() {");
        methods[i].accept(this);
        _out.println("  }");
        _out.println();
    }
    printMain();
    _out.println("}");
}