--%>
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 : Types of buffering supported by UNIX

    Explain different types of buffering which is supported by the UNIX?

    		•
  • Q : What is an Instance variable Instance

    Instance variable: It is a non-static field of a class. Each and every individual object of a class has its own copy of this field. This is in contrary to a class variable that is shared by all instances of class. Instance variables are employed to mo

    		•
  • Q : Explain Object reference Object

    Object reference: It is a reference to an object. Languages other than Java employ terms like pointer or address or. It is significant to keep the difference clear between an object and its reference. The variable like argo

    Q : What is an Instruction set Instruction

    Instruction set: The set of instructions which characterize a specific Central Processing Unit. The programs written in the instruction set of one type of CPU can’t usually be run on any other kind of CPU.

    		•
  • Q : Main purpose of Child Header files

    Illustrate what is the main purpose of Child Header files?

    		•
  • Q : Explain Downcast with example Explain

    Explain Downcast with example: It is a cast towards an object's dynamic kind - that is, `down' the inheritance hierarchy. For illustration:        // Downcast from Object to String

    		•
  • Q : Define the term Static type Define the

    Define the term Static type: It is the static type of an object is the declared type of the variable employed to refer to it.

    		•
  • Q : Property Specifications of Java

    Property Specifications: The most straightforward way to specify and check simple safety properties in JPF is to use Java assertions inside the application under analysis. This allows the specification of properties that only depend on the application

    		•
  • Q : Explai phases of software development

    Define the difference between phases of software development or software life cycle?

    		•
  • Q : Intermediate language concept Describe

    Describe the term Intermediate language? Illustrate in brief.

    		•