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Questions and Answers
Which of the following is a primary purpose of a symbol table in a compiler or assembler?
Which data structure is commonly used for implementing a symbol table?
Which of the following is a common key field used for searching in a search data structure?
What is the purpose of type checking in a compiler or assembler?
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What is the purpose of a search data structure in the context of a compiler or assembler?
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Which data structure is suitable for implementing a symbol table when dealing with a small amount of data?
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What is the purpose of scope resolution in a compiler or assembler?
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Which of the following data structures is typically not used for implementing a symbol table?
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What is the role of a symbol table in implementing type checking?
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Which of the following is not a common purpose of a symbol table in a compiler or assembler?
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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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Description
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.
