DLP 7th sem

What is the primary role of semantic analysis in a compiler's backend, particularly when dealing with nested scopes and variable declarations?

• Lexical analysis

• Syntax analysis

• Ensuring correct use of language rules and constraints

• Code generation

Which data structure is most commonly used to manage variable scopes in a compiler?

• Linked List

• Symbol Table

• Queue

• Binary Tree

How does a symbol table handle nested scopes within a program?

• Using a single global symbol table

• Using a stack or tree structure to manage different scopes

• By maintaining a flat list of symbols

• By directly generating machine code for each scope

What challenges might arise in semantic analysis when handling function definitions in nested scopes?

• Simple variable assignment

• Resolving variable bindings and managing scope rules

• Tokenizing source code

• Converting code to machine instructions

How does semantic analysis handle the declaration and initialization of variables in different scopes?

• It skips checking if a variable is initialized

• It checks that variables are declared before use and initialized correctly

• It only tracks global variables

• It allows variables to be used without initialization

What is intermediate code, and why is it important in the compilation process?

• The final executable code

• A code representation between high-level language and machine code

• An error message format

• A debugging tool

Which intermediate code representations are commonly used for arithmetic operations?

• Linked Lists and Graphs

• Binary Trees and Linked Lists

• Three-Address Code (TAC) and Abstract Syntax Trees (AST)

• Hexadecimal and Binary Code

How does a compiler generate intermediate code for control structures such as loops and conditionals?

• By creating labeled instructions and maintaining control flow graphs

• By ignoring them and directly generating machine code

• By using a simple text replacement

• By converting them into a single jump statement

What role does semantic analysis play in generating intermediate code for assignments and arithmetic operations?

• Ensures type compatibility and correct operator application

• Simplifies the parsing process

• Translates code into binary directly

• Reorders code for better readability

Describe the process of optimizing intermediate code and its impact on the final machine code.

• It reduces instruction count and improves performance

• It makes the code more complex and harder to debug

• It slows down the compilation process

• It converts the code directly into assembly language