Example #1
0
  CFG createCFG(String className) throws ClassNotFoundException {
    CFG cfg = new CFG();
    JavaClass jc = Repository.lookupClass(className);
    ClassGen cg = new ClassGen(jc);
    ConstantPoolGen cpg = cg.getConstantPool();
    for (Method m : cg.getMethods()) {
      MethodGen mg = new MethodGen(m, cg.getClassName(), cpg);
      InstructionList il = mg.getInstructionList();
      InstructionHandle[] handles = il.getInstructionHandles();
      int prev = 0;
      for (InstructionHandle ih : handles) {
        int position = ih.getPosition();
        cfg.addNode(position, m, jc);
        Instruction inst = ih.getInstruction();

        boolean br = inst.getName().contains("if") || inst.getName().contains("goto");
        boolean ret = inst.getName().contains("return");
        boolean stat = inst.getName().contains("invokestatic");
        int len = inst.getLength();

        if (stat) {
          int index = inst.toString(true).indexOf(" ");
          String name = inst.toString(true).substring(index + 1);
          int tar = Integer.valueOf(name);
          INVOKESTATIC inv = new INVOKESTATIC(tar);
          name = inv.getMethodName(cpg);

          Method m2 = null;
          Method[] tm = cg.getMethods();
          for (int i = 0; i < tm.length; i++) {
            if (tm[i].getName().equals(name)) {
              m2 = tm[i];
            }
          }
          cfg.addEdge(position, m, jc, 0, m2, jc);
          cfg.addEdge(-1, m2, jc, position + len, m, jc);
        }

        if (!ret && !stat) {
          cfg.addEdge(position, position + len, m, jc);
        }
        if (br) {
          cfg.addEdge(position, position + len, m, jc);
          IF_ICMPGE comp = new IF_ICMPGE(ih);
          String name = comp.getTarget().toString(false);
          int index = name.indexOf(">");
          name = name.substring(index + 2);
          int tar = Integer.valueOf(name);
          cfg.addEdge(position, tar, m, jc);
        }
        if (ret) {
          cfg.addEdge(position, -1, m, jc);
        }

        prev = position;
      }
      System.out.println(cfg.toString());
    }
    return cfg;
  }
Example #2
0
  /**
   * Transforms invoke instructions that match the specified list for this class to call the
   * specified static call instead.
   */
  private InstructionList xform_inst(MethodGen mg, Instruction inst) {

    switch (inst.getOpcode()) {
      case Constants.INVOKESTATIC:
        {
          InstructionList il = new InstructionList();
          INVOKESTATIC is = (INVOKESTATIC) inst;
          String cname = is.getClassName(pgen);
          String mname = is.getMethodName(pgen);
          Type[] args = is.getArgumentTypes(pgen);
          MethodDef orig = new MethodDef(cname + "." + mname, args);
          MethodInfo call = method_map.get(orig);
          if (call != null) {
            call.cnt++;
            String classname = call.method_class;
            String methodname = mname;
            debug_map.log(
                "%s.%s: Replacing method %s.%s (%s) with %s.%s%n",
                mg.getClassName(),
                mg.getName(),
                cname,
                mname,
                UtilMDE.join(args, ", "),
                classname,
                methodname);
            il.append(
                ifact.createInvoke(
                    classname, methodname, is.getReturnType(pgen), args, Constants.INVOKESTATIC));
          }
          return (il);
        }

      case Constants.INVOKEVIRTUAL:
        {
          InstructionList il = new InstructionList();
          INVOKEVIRTUAL iv = (INVOKEVIRTUAL) inst;
          String cname = iv.getClassName(pgen);
          String mname = iv.getMethodName(pgen);
          Type[] args = iv.getArgumentTypes(pgen);
          Type instance_type = iv.getReferenceType(pgen);
          Type[] new_args = BCELUtil.insert_type(instance_type, args);
          MethodDef orig = new MethodDef(cname + "." + mname, args);
          if (debug_class) System.out.printf("looking for %s in map %s%n", orig, method_map);
          MethodInfo call = method_map.get(orig);
          if (call != null) {
            call.cnt++;
            String classname = call.method_class;
            String methodname = mname;
            debug_map.log(
                "Replacing method %s.%s (%s) with %s.%s%n",
                cname, mname, ArraysMDE.toString(args), classname, methodname);
            il.append(
                ifact.createInvoke(
                    classname,
                    methodname,
                    iv.getReturnType(pgen),
                    new_args,
                    Constants.INVOKESTATIC));
          }
          return (il);
        }

      default:
        return (null);
    }
  }