Esempio n. 1
0
 byte[] nullAdaptClass(final InputStream is, final String name) throws Exception {
   JavaClass jc = new ClassParser(is, name + ".class").parse();
   ClassGen cg = new ClassGen(jc);
   String cName = cg.getClassName();
   ConstantPoolGen cp = cg.getConstantPool();
   Method[] ms = cg.getMethods();
   for (int j = 0; j < ms.length; ++j) {
     MethodGen mg = new MethodGen(ms[j], cg.getClassName(), cp);
     boolean lv = ms[j].getLocalVariableTable() == null;
     boolean ln = ms[j].getLineNumberTable() == null;
     if (lv) {
       mg.removeLocalVariables();
     }
     if (ln) {
       mg.removeLineNumbers();
     }
     mg.stripAttributes(skipDebug);
     InstructionList il = mg.getInstructionList();
     if (il != null) {
       InstructionHandle ih = il.getStart();
       while (ih != null) {
         ih = ih.getNext();
       }
       if (compute) {
         mg.setMaxStack();
         mg.setMaxLocals();
       }
     }
     cg.replaceMethod(ms[j], mg.getMethod());
   }
   return cg.getJavaClass().getBytes();
 }
  /**
   * Empties the method of all code (except for a return). This includes line numbers, exceptions,
   * local variables, etc.
   */
  public static void empty_method(MethodGen mg) {

    mg.setInstructionList(new InstructionList(new RETURN()));
    mg.removeExceptionHandlers();
    mg.removeLineNumbers();
    mg.removeLocalVariables();
    mg.setMaxLocals();
  }
Esempio n. 3
0
 byte[] counterAdaptClass(final InputStream is, final String name) throws Exception {
   JavaClass jc = new ClassParser(is, name + ".class").parse();
   ClassGen cg = new ClassGen(jc);
   String cName = cg.getClassName();
   ConstantPoolGen cp = cg.getConstantPool();
   if (!cg.isInterface()) {
     FieldGen fg = new FieldGen(ACC_PUBLIC, Type.getType("I"), "_counter", cp);
     cg.addField(fg.getField());
   }
   Method[] ms = cg.getMethods();
   for (int j = 0; j < ms.length; ++j) {
     MethodGen mg = new MethodGen(ms[j], cg.getClassName(), cp);
     if (!mg.getName().equals("<init>") && !mg.isStatic() && !mg.isAbstract() && !mg.isNative()) {
       if (mg.getInstructionList() != null) {
         InstructionList il = new InstructionList();
         il.append(new ALOAD(0));
         il.append(new ALOAD(0));
         il.append(new GETFIELD(cp.addFieldref(name, "_counter", "I")));
         il.append(new ICONST(1));
         il.append(new IADD());
         il.append(new PUTFIELD(cp.addFieldref(name, "_counter", "I")));
         mg.getInstructionList().insert(il);
         mg.setMaxStack(Math.max(mg.getMaxStack(), 2));
         boolean lv = ms[j].getLocalVariableTable() == null;
         boolean ln = ms[j].getLineNumberTable() == null;
         if (lv) {
           mg.removeLocalVariables();
         }
         if (ln) {
           mg.removeLineNumbers();
         }
         cg.replaceMethod(ms[j], mg.getMethod());
       }
     }
   }
   return cg.getJavaClass().getBytes();
 }
  /**
   * Sets the locals to 'this' and each of the arguments. Any other locals are removed. An
   * instruction list with at least one instruction must exist.
   */
  public static void setup_init_locals(MethodGen mg) {

    // Get the parameter types and names.
    Type[] arg_types = mg.getArgumentTypes();
    String[] arg_names = mg.getArgumentNames();

    // Remove any existing locals
    mg.setMaxLocals(0);
    mg.removeLocalVariables();

    // Add a local for the instance variable (this)
    if (!mg.isStatic()) mg.addLocalVariable("this", new ObjectType(mg.getClassName()), null, null);

    // Add a local for each parameter
    for (int ii = 0; ii < arg_names.length; ii++) {
      mg.addLocalVariable(arg_names[ii], arg_types[ii], null, null);
    }

    // Reset the current number of locals so that when other locals
    // are added they get added at the correct offset
    mg.setMaxLocals();

    return;
  }
 static void nullBCELAdapt(final byte[] b) throws IOException {
   JavaClass jc = new ClassParser(new ByteArrayInputStream(b), "class-name").parse();
   ClassGen cg = new ClassGen(jc);
   ConstantPoolGen cp = cg.getConstantPool();
   Method[] ms = cg.getMethods();
   for (int k = 0; k < ms.length; ++k) {
     MethodGen mg = new MethodGen(ms[k], cg.getClassName(), cp);
     boolean lv = ms[k].getLocalVariableTable() == null;
     boolean ln = ms[k].getLineNumberTable() == null;
     if (lv) {
       mg.removeLocalVariables();
     }
     if (ln) {
       mg.removeLineNumbers();
     }
     mg.stripAttributes(skipDebug);
     InstructionList il = mg.getInstructionList();
     if (il != null) {
       InstructionHandle ih = il.getStart();
       while (ih != null) {
         ih = ih.getNext();
       }
       if (compute) {
         mg.setMaxStack();
         mg.setMaxLocals();
       }
       if (computeFrames) {
         ModifiedPass3bVerifier verif;
         verif = new ModifiedPass3bVerifier(jc, k);
         verif.do_verify();
       }
     }
     cg.replaceMethod(ms[k], mg.getMethod());
   }
   cg.getJavaClass().getBytes();
 }