MyCC

This is a compiler written in C++ as part of the MAC5750 class - Compilers Theory and Building (University of São Paulo).

Why I keep this project? It was the best class during university and is good summary of what a learned during the course. Also, the professor responsible for the discipline was one of the most important ones in my life.

Running

It is simple to, build the compiler:

make

At the moment, it only works on Linux x86. If you are running in odd system, you can use the Dockerfile.

To generate an assembly run:

./mycc <PROGRAM_NAME> > out.s

There is still some work to do the transcript the assembly to machine code. You can achieve by using gcc:

gcc out.s

Notes

Using MYCC_NUMBER_OF_REGISTERS env var you can set the number of register used by the final code. At the moment, it can be a value between 2 and 12. The default register are: rbp, rsp, rdi, rax, rbx

Steps

The compiler doesn’t use any external dependency, just pure C++. The parser and the lexical analyser (lex) were written from the scratch.

The lex and the parser are build together with the compiler. The tokens are defined in final/lex.lex and the grammar in final/parser.

Depending on the flags this program can generate a Graphviz representation of the internal state and the transformations.

Directories

• final: contains the compiler core
• lex: lexical analyser
• parser: grammar parser
• programs: examples and expected results
• scripts: helper scripts to build this site and run tests
• site: this site in Hugo

TODOs

Memory leaks? Yes, it is the default. Arrays? Not supported. However, you can create objects.

Tests: