Pascal-MIPS Compiler

A compiler that translates Pascal syntax into MIPS assembly language using Bison and Flex, implemented in Lex, Yacc, and C.

Features

• Pascal to MIPS assembly translation
• Lexical analysis using Flex
• Syntax parsing using Bison
• Error detection and reporting
• MIPS code generation

Building the Compiler

Prerequisites

• GCC compiler
• Flex (lexical analyzer generator)
• Bison (parser generator)
• Make (optional, for automated building)

Build Instructions

Using Make (Recommended)

make

Manual Build

bison -d CPM.y
flex CPM.lex
gcc -o CPM.exe lex.yy.c y.tab.c

How to Use

Prerequisites

• Built compiler executable (CPM.exe)
• Pascal source files to compile

Steps

1. Open Command Prompt and navigate to the directory where you extracted the compiler files

2. Select Input Files - Follow the interface shown below to choose your Pascal source files:

   

3. Execute Compilation - Press Enter to start the compilation process

   • Success: If no errors occur, a MIPS assembly file will be generated
   • Error: If compilation fails, an error text file will be created with details

4. Compilation Process:

   

5. Successful Output:

   

Error Handling

The compiler provides comprehensive error reporting. Below are examples of different error scenarios:

Syntax Errors

Compilation Errors

Error File Generation

Error Log Content

Output

• Success: .mips file containing the translated assembly code
• Error: .txt file containing detailed error messages and line numbers

Project Structure

Mips_Compiler/
├── CPM.lex          # Lexical analyzer specification
├── CPM.y            # Grammar specification (Bison)
├── CPM.exe          # Compiled executable
├── examples/        # Test cases
├── Makefile         # Build automation
├── README.md        # This file
├── WorkingExample.txt    # Valid Pascal code
└── NotWorkingExample.txt # Invalid Pascal code (for testing)

Example Programs

The examples/ directory contains sample Pascal programs:

• basic_arithmetic.txt - Arithmetic operations
• control_flow.txt - If/else and while loops

Technologies Used

• Flex: Lexical analyzer generator
• Bison: Parser generator (successor to Yacc)
• C: Implementation language
• Pascal: Source language
• MIPS: Target assembly language

Development

Clean Build

make clean
make

Testing

make test        # Test with working example
make test-error  # Test with error example

License

This project is licensed under the MIT License - see the LICENSE file for details.