How to resolve the algorithm Create an object at a given address step by step in the Action! programming language

Published on 12 May 2024 09:40 PM
#Action!

How to resolve the algorithm Create an object at a given address step by step in the Action! programming language

Table of Contents

Problem Statement

In systems programing it is sometimes required to place language objects at specific memory locations, like I/O registers, hardware interrupt vectors etc.

Show how language objects can be allocated at a specific machine addresses. Since most OSes prohibit access to the physical memory if it is not mapped by the application, as an example, rather than a physical address, take the address of some existing object (using suitable address operations if necessary).

For example:

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Create an object at a given address step by step in the Action! programming language

Source code in the action! programming language

DEFINE FIRST="12345"
DEFINE SECOND="54321"
DEFINE PTR="CARD"

PROC Main()
  PTR base,copy=base

  PrintF("Address of base variable: %H%E",@base)
  PrintF("Address of copy variable: %H%E",@copy)
  PutE()

  PrintF("Assign %U value to base variable%E",FIRST)
  base=FIRST
  PrintF("Value of base variable: %U%E",base)
  PrintF("Value of copy variable: %U%E",copy)
  PutE()

  PrintF("Assign %U value to base variable%E",SECOND)
  base=SECOND
  PrintF("Value of base variable: %U%E",base)
  PrintF("Value of copy variable: %U%E",copy)
RETURN

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