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A simple two-pass assembler does which of the following in the first pass?
1. It allocates space for the literals.
2. It computes the total length of the program.
3. It builds the symbol table for the symbols and their values.
4. It generates code for all the load and stores register instruction.
1. It allocates space for the literals.
2. It computes the total length of the program.
3. It builds the symbol table for the symbols and their values.
4. It generates code for all the load and stores register instruction.
- a)1 only
- b)1 and 2
- c)1, 2 and 3
- d)4 only
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A simple two-pass assembler does which of the following in the first p...
Simple two-pass assembler:
1. Allocates space for the literals.
2. Computers the total length of program (syntax analysis).
3. Builds the symbol table for the symbols and their values.
1. Allocates space for the literals.
2. Computers the total length of program (syntax analysis).
3. Builds the symbol table for the symbols and their values.
Most Upvoted Answer
A simple two-pass assembler does which of the following in the first p...
First Pass in a Two-Pass Assembler:
In a two-pass assembler, the assembly process is divided into two passes. The first pass performs certain tasks, while the second pass completes the remaining tasks. Let's discuss the tasks performed in the first pass:
1. Allocates Space for Literals:
During the assembly process, literals (constant values used in the program) need to be allocated memory. In the first pass, the assembler identifies all the literals in the assembly code and reserves memory space for them. This allows the assembler to generate appropriate instructions for loading these literals in the second pass.
2. Computes the Total Length of the Program:
The first pass also calculates the total length of the program. It scans through the assembly code, counting the number of instructions and directives encountered. By keeping track of the length of each instruction, it calculates the total length of the program. This information is crucial for generating the correct object code in the second pass.
3. Builds the Symbol Table:
The symbol table is a data structure that stores the symbols (labels and variables) used in the assembly code and their corresponding memory addresses or values. In the first pass, the assembler constructs the symbol table by scanning the assembly code and identifying all the symbols and their values. This table is used in the second pass to resolve symbol references and generate the appropriate object code.
4. Does Not Generate Code for Load and Store Register Instructions:
Generating code for load and store register instructions is not a task performed in the first pass of a two-pass assembler. This task is typically handled in the second pass, where the assembler has complete information about the symbols, literals, and their memory locations.
Conclusion:
In the first pass of a simple two-pass assembler, the following tasks are performed:
1. Allocating space for literals
2. Computing the total length of the program
3. Building the symbol table for symbols and their values
Therefore, the correct option is (c) 1, 2, and 3.
In a two-pass assembler, the assembly process is divided into two passes. The first pass performs certain tasks, while the second pass completes the remaining tasks. Let's discuss the tasks performed in the first pass:
1. Allocates Space for Literals:
During the assembly process, literals (constant values used in the program) need to be allocated memory. In the first pass, the assembler identifies all the literals in the assembly code and reserves memory space for them. This allows the assembler to generate appropriate instructions for loading these literals in the second pass.
2. Computes the Total Length of the Program:
The first pass also calculates the total length of the program. It scans through the assembly code, counting the number of instructions and directives encountered. By keeping track of the length of each instruction, it calculates the total length of the program. This information is crucial for generating the correct object code in the second pass.
3. Builds the Symbol Table:
The symbol table is a data structure that stores the symbols (labels and variables) used in the assembly code and their corresponding memory addresses or values. In the first pass, the assembler constructs the symbol table by scanning the assembly code and identifying all the symbols and their values. This table is used in the second pass to resolve symbol references and generate the appropriate object code.
4. Does Not Generate Code for Load and Store Register Instructions:
Generating code for load and store register instructions is not a task performed in the first pass of a two-pass assembler. This task is typically handled in the second pass, where the assembler has complete information about the symbols, literals, and their memory locations.
Conclusion:
In the first pass of a simple two-pass assembler, the following tasks are performed:
1. Allocating space for literals
2. Computing the total length of the program
3. Building the symbol table for symbols and their values
Therefore, the correct option is (c) 1, 2, and 3.
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A simple two-pass assembler does which of the following in the first pass?1. It allocates space for the literals.2. It computes the total length of the program.3. It builds the symbol table for the symbols and their values.4. It generates code for all the load and stores register instruction.a)1 onlyb)1 and 2c)1, 2 and 3d)4 onlyCorrect answer is option 'C'. Can you explain this answer? for Computer Science Engineering (CSE) 2025 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about A simple two-pass assembler does which of the following in the first pass?1. It allocates space for the literals.2. It computes the total length of the program.3. It builds the symbol table for the symbols and their values.4. It generates code for all the load and stores register instruction.a)1 onlyb)1 and 2c)1, 2 and 3d)4 onlyCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A simple two-pass assembler does which of the following in the first pass?1. It allocates space for the literals.2. It computes the total length of the program.3. It builds the symbol table for the symbols and their values.4. It generates code for all the load and stores register instruction.a)1 onlyb)1 and 2c)1, 2 and 3d)4 onlyCorrect answer is option 'C'. Can you explain this answer?.
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