--%>
Assignment Help - homework help

Environment Modeling in Java Pathfinder

Environment Modeling: In JPF, Java class files can be processed in two different ways:

A) As ordinary Java classes managed and executed by the host JVM (e.g., standard Java library classes, JPF implementation classes)

B) As “modeled” classes managed and processed (verified) by JPF

We have to clearly distinguish between these two modes. In particular, JPF’s “Model” layer has its own class and object model, which is completely different than and incompatible with the hidden class and object models of the underlying host JVM executing JPF.

Each standard JVM supports a Java Native Interface (JNI), that is used to delegate execution from the JVM-controlled bytecode down into the platform-dependent native layer (machine code). This is normally used to interface certain functionalities such as I/O or graphics to the platform OS and architecture. JPF provides an analogous mechanism to lower the “execution” level in JPF from JPF-controlled bytecode into JVM-controlled bytecode. This mechanism is called Model Java Interface (MJI). It supports the creation of dedicated classes to be executed by the underlying JVM rather than JPF. Such classes are not model checked by JPF.

   Related Questions in Programming Languages

  • Q : Reducing state space of code What is

    What is the way to reduce the state space of the code during model checking?

    		•
  • Q : Explain the term Test Fusion Report of

    Explain the term Test Fusion Report of QTP?

    		•
  • Q : Explain Primitive Type Abstractions

    Primitive Type Abstractions: An effective way to reduce the state space of a program is to replace the primitive types with the corresponding abstractions that encapsulate all the possible operations that are performed on these types.

    Q : What is Logical error Logical error :

    Logical error: It is an error in the logical of a class or method. Such an error may not lead to an instant runtime error, however could have a noteworthy impact on overall program exactness.

    		•
  • Q : Define Multiple Inheritance Multiple

    Multiple Inheritance: In C++, multiple-inheritance occurs when a class inherits from more than one parent. For example: 524_mult</span></p> </div> <!-- /comment-box --> </li> </td> </tr><tr> <td> <li> <div class=

    Q : Modeling Language for SPIN-Promela

    Modeling Language: The modeling language used for SPIN is called Promela (Process Meta Language). In fact, the name SPIN stands for Simple Promela Interpreter. Promela is a powerful C-like specification language with a variety of synchronization primi

    		•
  • Q : Define Aliases Aliases : It is a

    Aliases: It is a multiple references to a single object. Messages might be sent to the object through any of its aliases. The resultant state modifications will be detectable by all.

    		•
  • Q : Write a program that initializes an

    Write a program that initializes an integer array a[20] with values {0, 1, 2, 3, ...18, 19 - once each} then scrambles them up and prints the values in random order. For example: 19 2 3 8 11 1 4 17 7 15 9 0 16 12 18 13 5 6 10 14    

    		•
  • Q : Type promotion rule Q. Explain type

    Q. Explain type conversion rules for basic data types in java. Ans. Type promotion rule: Java automatically each bits or short operant to int when evaluating an expression. As usual as the automatic promotion

    		•
  • Q : Use of new operator What is the use of

    What is the use of new operator?

    		•