Elements of Assembly Language Programming
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Elements of Assembly Language Programming

Explore the basic elements of assembly language programming, including Labels, Orders, Directives, and Comments. Understand the concept of fixed size record, variable size record, and hybrid record in the context of assembly language programming.

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@GleefulPathos

Questions and Answers

Which of the following is a primary purpose of a symbol table in a compiler or assembler?

To store the names of all entities in a structured form at one place

Which data structure is commonly used for implementing a symbol table?

Hash table

Which of the following is a common key field used for searching in a search data structure?

Entity name

What is the purpose of type checking in a compiler or assembler?

<p>To verify that assignments and expressions are semantically correct</p> Signup and view all the answers

What is the purpose of a search data structure in the context of a compiler or assembler?

<p>To accommodate information concerning one entity</p> Signup and view all the answers

Which data structure is suitable for implementing a symbol table when dealing with a small amount of data?

<p>Unordered list</p> Signup and view all the answers

What is the purpose of scope resolution in a compiler or assembler?

<p>To determine the scope of a name (e.g., variable, function)</p> Signup and view all the answers

Which of the following data structures is typically not used for implementing a symbol table?

<p>Heap</p> Signup and view all the answers

What is the role of a symbol table in implementing type checking?

<p>To store the data types of all entities in the source code</p> Signup and view all the answers

Which of the following is not a common purpose of a symbol table in a compiler or assembler?

<p>To perform code optimization</p> Signup and view all the answers

Study Notes

Record Types

  • Fixed Size Record: Each entry has the same type and size
  • Variable Size Record: Type and size of each record can be different
  • Hybrid Record: Entries have both fixed length and variable length parts

Assembly Language Programming

  • Assembly language is similar to any other language, with its own words, rules, and syntax
  • Basic elements of assembly language include:
    • Labels
    • Orders
    • Directives
    • Comments

Assembler Design

  • Assembler is system software that converts assembly language programs to object code
  • Input: Source code written in assembly language using mnemonics
  • Output: Object code
  • Design depends on machine architecture
  • Syntax rule: Identifies whether source program statements are in a well-defined format
  • Semantic rule: Associates meaning with each valid statement in a source program

Synthesis Phase

  • Constructs a target language statement for each valid source language statement
  • Involves two crucial tasks:
    • Memory Allocation: Creates a data structure in the target program
    • Code Generation: Generates a target program

Symbol Table

  • An important data structure created and maintained by compilers
  • Stores information about the scope and binding information of names, variables, functions, classes, objects, etc.
  • Used by both analysis and synthesis parts of a compiler
  • Purposes:
    • Stores entities in a structured form
    • Verifies if a variable has been declared
    • Implements type checking
    • Determines scope of a name

Symbol Table Implementation

  • Can be implemented as:
    • Unordered list (easy to code, but suitable for small tables only)
    • Linear (sorted or unsorted) list
    • Binary Search Tree
    • Hash table (most commonly used, where the source code symbol is the key for the hash function)

Search Data Structures

  • A set of entries containing information about one entity
  • Each entity has a key field that forms the basis for search

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