Package javassist.bytecode

Examples of javassist.bytecode.Bytecode

This program produces a Code attribute including a bytecode sequence:

@see ConstPool @see CodeAttribute
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    ConstPool cp = classfile.getConstPool();
    int this_class_index = cp.getThisClassInfo();
    MethodInfo minfo = new MethodInfo(cp, GETFIELDHANDLER_METHOD_NAME,
                                      GETFIELDHANDLER_METHOD_DESCRIPTOR);
    /* local variable | this | */
    Bytecode code = new Bytecode(cp, 2, 1);
    // aload_0 // load this
    code.addAload(0);
    // getfield // get field "$JAVASSIST_CALLBACK" defined already
    code.addOpcode(Opcode.GETFIELD);
    int field_index = cp.addFieldrefInfo(this_class_index,
                                         HANDLER_FIELD_NAME, HANDLER_FIELD_DESCRIPTOR);
    code.addIndex(field_index);
    // areturn // return the value of the field
    code.addOpcode(Opcode.ARETURN);
    minfo.setCodeAttribute(code.toCodeAttribute());
    minfo.setAccessFlags(AccessFlag.PUBLIC);
    CodeAttribute codeAttribute = minfo.getCodeAttribute();
    if (codeAttribute != null) {
      StackMapTable smt = MapMaker.make(classPool, minfo);
      codeAttribute.setAttribute(smt);
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    ConstPool cp = classfile.getConstPool();
    int this_class_index = cp.getThisClassInfo();
    MethodInfo minfo = new MethodInfo(cp, SETFIELDHANDLER_METHOD_NAME,
                                      SETFIELDHANDLER_METHOD_DESCRIPTOR);
    /* local variables | this | callback | */
    Bytecode code = new Bytecode(cp, 3, 3);
    // aload_0 // load this
    code.addAload(0);
    // aload_1 // load callback
    code.addAload(1);
    // putfield // put field "$JAVASSIST_CALLBACK" defined already
    code.addOpcode(Opcode.PUTFIELD);
    int field_index = cp.addFieldrefInfo(this_class_index,
                                         HANDLER_FIELD_NAME, HANDLER_FIELD_DESCRIPTOR);
    code.addIndex(field_index);
    // return
    code.addOpcode(Opcode.RETURN);
    minfo.setCodeAttribute(code.toCodeAttribute());
    minfo.setAccessFlags(AccessFlag.PUBLIC);
    CodeAttribute codeAttribute = minfo.getCodeAttribute();
    if (codeAttribute != null) {
      StackMapTable smt = MapMaker.make(classPool, minfo);
      codeAttribute.setAttribute(smt);
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    int this_class_index = cp.getThisClassInfo();
    String desc = "()" + finfo.getDescriptor();
    MethodInfo minfo = new MethodInfo(cp, EACH_READ_METHOD_PREFIX
                                          + finfo.getName(), desc);
    /* local variables | target obj | each oldvalue | */
    Bytecode code = new Bytecode(cp, 5, 3);
    // aload_0
    code.addAload(0);
    // getfield // get each field
    code.addOpcode(Opcode.GETFIELD);
    int base_field_index = cp.addFieldrefInfo(this_class_index, finfo
        .getName(), finfo.getDescriptor());
    code.addIndex(base_field_index);
    // aload_0
    code.addAload(0);
    // invokeinterface // invoke Enabled.getInterceptFieldCallback()
    int enabled_class_index = cp.addClassInfo(FIELD_HANDLED_TYPE_NAME);
    code.addInvokeinterface(enabled_class_index,
                            GETFIELDHANDLER_METHOD_NAME, GETFIELDHANDLER_METHOD_DESCRIPTOR,
                            1);
    // ifnonnull
    code.addOpcode(Opcode.IFNONNULL);
    code.addIndex(4);
    // *return // each type
    addTypeDependDataReturn(code, finfo.getDescriptor());
    // *store_1 // each type
    addTypeDependDataStore(code, finfo.getDescriptor(), 1);
    // aload_0
    code.addAload(0);
    // invokeinterface // invoke Enabled.getInterceptFieldCallback()
    code.addInvokeinterface(enabled_class_index,
                            GETFIELDHANDLER_METHOD_NAME, GETFIELDHANDLER_METHOD_DESCRIPTOR,
                            1);
    // aload_0
    code.addAload(0);
    // ldc // name of the field
    code.addLdc(finfo.getName());
    // *load_1 // each type
    addTypeDependDataLoad(code, finfo.getDescriptor(), 1);
    // invokeinterface // invoke Callback.read*() // each type
    addInvokeFieldHandlerMethod(classfile, code, finfo.getDescriptor(),
                                true);
    // *return // each type
    addTypeDependDataReturn(code, finfo.getDescriptor());

    minfo.setCodeAttribute(code.toCodeAttribute());
    minfo.setAccessFlags(AccessFlag.PUBLIC);
    CodeAttribute codeAttribute = minfo.getCodeAttribute();
    if (codeAttribute != null) {
      StackMapTable smt = MapMaker.make(classPool, minfo);
      codeAttribute.setAttribute(smt);
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    int this_class_index = cp.getThisClassInfo();
    String desc = "(" + finfo.getDescriptor() + ")V";
    MethodInfo minfo = new MethodInfo(cp, EACH_WRITE_METHOD_PREFIX
                                          + finfo.getName(), desc);
    /* local variables | target obj | each oldvalue | */
    Bytecode code = new Bytecode(cp, 6, 3);
    // aload_0
    code.addAload(0);
    // invokeinterface // enabled.getInterceptFieldCallback()
    int enabled_class_index = cp.addClassInfo(FIELD_HANDLED_TYPE_NAME);
    code.addInvokeinterface(enabled_class_index,
                            GETFIELDHANDLER_METHOD_NAME, GETFIELDHANDLER_METHOD_DESCRIPTOR,
                            1);
    // ifnonnull (label1)
    code.addOpcode(Opcode.IFNONNULL);
    code.addIndex(9);
    // aload_0
    code.addAload(0);
    // *load_1
    addTypeDependDataLoad(code, finfo.getDescriptor(), 1);
    // putfield
    code.addOpcode(Opcode.PUTFIELD);
    int base_field_index = cp.addFieldrefInfo(this_class_index, finfo
        .getName(), finfo.getDescriptor());
    code.addIndex(base_field_index);
    code.growStack(-Descriptor.dataSize(finfo.getDescriptor()));
    // return ;
    code.addOpcode(Opcode.RETURN);
    // aload_0
    code.addAload(0);
    // dup
    code.addOpcode(Opcode.DUP);
    // invokeinterface // enabled.getInterceptFieldCallback()
    code.addInvokeinterface(enabled_class_index,
                            GETFIELDHANDLER_METHOD_NAME, GETFIELDHANDLER_METHOD_DESCRIPTOR,
                            1);
    // aload_0
    code.addAload(0);
    // ldc // field name
    code.addLdc(finfo.getName());
    // aload_0
    code.addAload(0);
    // getfield // old value of the field
    code.addOpcode(Opcode.GETFIELD);
    code.addIndex(base_field_index);
    code.growStack(Descriptor.dataSize(finfo.getDescriptor()) - 1);
    // *load_1
    addTypeDependDataLoad(code, finfo.getDescriptor(), 1);
    // invokeinterface // callback.write*(..)
    addInvokeFieldHandlerMethod(classfile, code, finfo.getDescriptor(),
                                false);
    // putfield // new value of the field
    code.addOpcode(Opcode.PUTFIELD);
    code.addIndex(base_field_index);
    code.growStack(-Descriptor.dataSize(finfo.getDescriptor()));
    // return
    code.addOpcode(Opcode.RETURN);

    minfo.setCodeAttribute(code.toCodeAttribute());
    minfo.setAccessFlags(AccessFlag.PUBLIC);
    CodeAttribute codeAttribute = minfo.getCodeAttribute();
    if (codeAttribute != null) {
      StackMapTable smt = MapMaker.make(classPool, minfo);
      codeAttribute.setAttribute(smt);
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        if (clinit != null)
            return clinit;

        checkModify();
        ClassFile cf = getClassFile2();
        Bytecode code = new Bytecode(cf.getConstPool(), 0, 0);
        modifyClassConstructor(cf, code, 0, 0);
        return getClassInitializer();
    }
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        throws CannotCompileException, NotFoundException
    {
        if (fieldInitializers == null)
            return;

        Bytecode code = new Bytecode(cf.getConstPool(), 0, 0);
        Javac jv = new Javac(code, this);
        int stacksize = 0;
        boolean doInit = false;
        for (FieldInitLink fi = fieldInitializers; fi != null; fi = fi.next) {
            CtField f = fi.field;
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            MethodInfo minfo = (MethodInfo)list.get(i);
            if (minfo.isConstructor()) {
                CodeAttribute codeAttr = minfo.getCodeAttribute();
                if (codeAttr != null)
                    try {
                        Bytecode init = new Bytecode(cp, 0,
                                                codeAttr.getMaxLocals());
                        CtClass[] params
                            = Descriptor.getParameterTypes(
                                                minfo.getDescriptor(),
                                                classPool);
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     *
     * @param thisClass         the class that a compiled method/field
     *                          belongs to.
     */
    public Javac(CtClass thisClass) {
        this(new Bytecode(thisClass.getClassFile2().getConstPool(), 0, 0),
             thisClass);
    }
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    ConstPool cp = classfile.getConstPool();
    int this_class_index = cp.getThisClassInfo();
    MethodInfo minfo = new MethodInfo(cp, GETFIELDHANDLER_METHOD_NAME,
                                      GETFIELDHANDLER_METHOD_DESCRIPTOR);
    /* local variable | this | */
    Bytecode code = new Bytecode(cp, 2, 1);
    // aload_0 // load this
    code.addAload(0);
    // getfield // get field "$JAVASSIST_CALLBACK" defined already
    code.addOpcode(Opcode.GETFIELD);
    int field_index = cp.addFieldrefInfo(this_class_index,
                                         HANDLER_FIELD_NAME, HANDLER_FIELD_DESCRIPTOR);
    code.addIndex(field_index);
    // areturn // return the value of the field
    code.addOpcode(Opcode.ARETURN);
    minfo.setCodeAttribute(code.toCodeAttribute());
    minfo.setAccessFlags(AccessFlag.PUBLIC);
    classfile.addMethod(minfo);
  }
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    ConstPool cp = classfile.getConstPool();
    int this_class_index = cp.getThisClassInfo();
    MethodInfo minfo = new MethodInfo(cp, SETFIELDHANDLER_METHOD_NAME,
                                      SETFIELDHANDLER_METHOD_DESCRIPTOR);
    /* local variables | this | callback | */
    Bytecode code = new Bytecode(cp, 3, 3);
    // aload_0 // load this
    code.addAload(0);
    // aload_1 // load callback
    code.addAload(1);
    // putfield // put field "$JAVASSIST_CALLBACK" defined already
    code.addOpcode(Opcode.PUTFIELD);
    int field_index = cp.addFieldrefInfo(this_class_index,
                                         HANDLER_FIELD_NAME, HANDLER_FIELD_DESCRIPTOR);
    code.addIndex(field_index);
    // return
    code.addOpcode(Opcode.RETURN);
    minfo.setCodeAttribute(code.toCodeAttribute());
    minfo.setAccessFlags(AccessFlag.PUBLIC);
    classfile.addMethod(minfo);
  }
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Related Classes of javassist.bytecode.Bytecode

  • cuchaz.enigma.bytecode.BytecodeTools
  • javassist.compiler.AccessorMaker
  • javassist.compiler.CodeGen
  • javassist.compiler.Javac
  • javassist.compiler.MemberCodeGen
  • javassist.convert.TransformBefore
  • javassist.CtBehavior
  • javassist.CtClass
  • javassist.CtClassType
  • javassist.CtConstructor
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