Discussion Assignment Unit 7 Hack assembler uses two passes. Explain why it is necessary to review the code twice.

1. What is the difference between a. and a. First Pass: The Hack assembler is a two-pass assembler that can effectively handle forward references. Forward references occur when a symbol is used before its definition in the code. To resolve these references, the assembler must ensure that it has a thorough understanding of all symbol definitions before generating the final machine code.

During the first pass, the assembler scans the entire source code for label definitions and stores their addresses in a symbol table. Labels are symbolic names that represent memory addresses, and by the end of the first pass, the assembler has determined the memory addresses …show more content…
two-pass assembly? One-Pass Assembly (back-patching).

Pros: Efficient: The assembler generates the final machine code in a single pass, resulting in faster assembly time.

Simplicity of Implementation: In some cases, particularly with smaller programs, a one-pass assembler can be easier to implement because it eliminates the need for multiple scans of code. Cons: Handling forward references in a single pass can be challenging, requiring careful management of placeholders and back-patching lists.

Limited Optimization: One-pass assemblers may have limited ability to perform optimizations that necessitate a thorough understanding of the code structure, which is more readily available after a full initial pass.

Pros: Two-pass assembly and a slew of features. Comprehensive Symbol Resolution: The two-pass approach offers a simple mechanism for resolving all symbols, including forward references, resulting in accurate and reliable machine code generation.

Better Optimization: With a thorough understanding of the code after the first pass, the assembler can perform more sophisticated optimizations and error checking on the second