Category Archives: SPCC

Snippets, SPCC

Implementation of Bottom-Up (Shift-Reduce) Parsing in C++

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This program implements a basic shift-reduce parser for parsing expressions based on given grammar rules. It reads a set of production rules and an input string, then attempts to reduce the input to the start symbol.

The process follows these steps:

  1. Shift input symbols onto a stack.
  2. Attempt to reduce the top of the stack based on the given production rules.
  3. Continue until the entire input is processed and reduced to the start symbol.
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Snippets, SPCC

Implementing Macro Processor in C

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A macro processor is a fundamental system program designed to streamline the programming process by replacing macro instructions within a source code with their pre-defined sequences of statements. This implementation provides a basic macro processor written in C.

This C program functions by reading an assembly language program that may contain macro definitions and macro calls. The input assembly code is expected to be provided in a file named MACIN.TXT. The core functionality of this processor involves:

  1. Macro Definition Detection: Identifying and parsing macro definitions within the input source code.
  2. Macro Definition Storage: Storing the identified macro definitions in a dedicated data structure known as the Macro Definition Table (MDT).
  3. Macro Expansion: When macro calls are encountered in the input, the processor retrieves the corresponding definition from the MDT and substitutes the macro call with the stored sequence of assembly language statements.

The final expanded assembly code, with all macro calls replaced by their respective bodies, is then written to an output file named MACOUT.TXT. This process effectively automates the expansion of commonly used code blocks, reducing redundancy and improving code readability and maintainability.

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