coditva / uc-to-llvm

A small uC compiler front-end for LLVM

Micro C (uC) to LLVM compiler

Micro C or uC is a subset of C language. This compiler compiles it to LLVM for execution.

How to

Make sure you have LLVM library installed before compiling

make        # compile
make test   # run tests
make clean  # cleanup
TEST=test0.uc make test  # run tests on test0.uc only

./uc FILENAME   # generate the LLVM IR
llvm-as a.ll    # convert the IR to bytecode
lli a.bc        # run the bytecode

The IR generated can be found in a.ll and the byte-code is in a.bc.

About uC

The uC is a subset of C with very basic functionality. The implemented version of uC supports the following:

• All variable are of type int32.
• Every statement ends with ;.
• Variable can be assigned as: a = 10; or a = b; given b is defined before
• Arguments can be input as a = $1;.
• There are no functions. Everything is assumed to be in main.
• Comments start with // and go on till end of line.
• if (condition) { statements }
• if (condition) { statements } else { statements }
• while (condition) { statments }
• for (expression; condition; expression) { statements }
• do { statements } while (condition);
• If there is only one statement, { and } can be dropped.
• Loops and conditional statements cannot be nested.
• All operators from C are supported.
• break and return are supported.

See programs in tests/ for sample.

Author

Utkarsh Maheshwari

License

MIT