EBK CONCEPTS OF PROGRAMMING LANGUAGES
EBK CONCEPTS OF PROGRAMMING LANGUAGES
12th Edition
ISBN: 9780135102251
Author: Sebesta
Publisher: VST
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Chapter 6, Problem 1RQ

Explanation of Solution

Descriptor:

  • The descriptor is nothing but collection of the attributes of a variable.
  • It is an area of memory which stores the attributes of a variable in an implementation.
  • If the attributes are all static, then the descriptors are required only at compile time. These descriptors are built by the compiler, usually as a part of the symbol table, and are used during compilation.
  • For dynamic attributes, all of the descriptor must be maintained during execution. Here, the descriptor is used by the run-time system.
  • Generally, it is used for type checking and building the code for the allocation and deallocation operations.

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