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BUCOL - Compiler Theory CS4455

Submission: Adam Byrne (22338004)

Objective

Write a parser and accompanying lexical analysis tool for a syntactically limited language (BUCOL) using the tools provided by the course e.g. flex and bison. The tool should be able to parse a file written in BUCOL and output whether the program is correctly formed w.r.t. its structure. I have implemented Cuckoo hashing for the symbol table which gives constant time worst case lookups and insertions (amortized) which helps with collision resolution.

Instructions

git clone https://github.com/theadambyrne/BUCOL.git
cd BUCOL

# build the project
./build.sh

# run the parser
./dist/parser < examples/good.bucol

# run parser in REPL mode
./dist/parser

Language description

  • Programs are monolithic using BEGINNING. and END. as delimiters.
  • Statements are composed of declarations, assignments, inputs and outputs.
  • Declarations are contained below the BEGINNING., supporting only integers (null value = 0).
    • First define the capacity eith a string of Xs to represent number of digits.
    • Then the identifier which is any permutation of letters, hyphens and digits (must start with a character and not a contiguous series of Xs).
  • Next is the BODY.
    • Assignments are of the form MOVE <identifier> TO <identifier>.
    • Addition is of the form ADD <identifier> TO <identifier>.
    • Input is of the form INPUT <identifier1> <identifier2> <identifier3>.
    • Output is of the form PRINT "text to be printed"; <identifier>.

Note: The language is case-insensitive and whitespace is ignored.

Project structure

├── build.sh # Compilation and linking script
├── examples # Example BUCOL programs from the assignment
│   ├── bad.bucol
│   ├── bigMoveLiteral.bucol
│   ├── bigMoveVar.bucol
│   └── good.bucol
├── out # Output directory for the build script
│   ├── lex.yy.c
│   ├── parser # Executable
│   ├── parser.tab.c
│   └── parser.tab.h
└── src
    ├── lexer.l # Lexical analysis
    ├── main.c # Operations and error handling
    ├── main.h
    ├── parser.y # Syntax analysis
    ├── cuckoo.c # Symbol table
    ├── cuckoo.h