About

This is a very naive attempt at implementing a C frontend compiler. The implemented frontend architecture is described in the following diagram:

Symbol Table

The symbol table is implemented using a finite state machine as described below:

Instructions

1. make sure flex is installed in your machine
2. make sure to have python 3.8+ installed and install package dependancies in requirements.txt
3. generate C lexer code from lexer.lex

flex lexer/lexer.lex

3. compile previously generated C code file (make sure you have a C compiler installed in your machine):

gcc lex.yy.c -lfl

4. pipe a C source code into the previously compiled lexer then pipe the output of the lexer to the Python parser:

cat examples/example3.c | ./a.out | python3 parser/symbol_table.py

Know Limitations

• Preprocessor should be run on source C code before attempting to tokenize it. Not doing so will result in a lot of undefined-variable errors
• Name of scope isn't specified (should be implemented easily).
• Pointers are not yet properly handled.
• String literal tokenizer
• Ignore single line comments
• Ignore multiple line comments

License

MIT License as specified in the LICENSE.txt file.