README.md

C-Compiler

A C language compiler for practice. WIP!

Usage

After built, run the program with one argument like the example below:

./C_Compiler "return 10 + 3 * 4 - (-1 == 2);"

The available operators include addition, subtraction, multiplication, division, remainder, unary plus, unary minus, relational operators, equality operators, and assignment operators.

A return statement is necessary. Unreachable code after the return statement won't be parsed.

You can use variables like foo = 10; return foo + 1;. Trying to access a variable that hasn't assigned before causes compilation error.

The program will output LLVM IR into stdout. You may redirect the output into a file and run it with lli.

Command Template

Optimize the IR and output

./C_Compiler $SOURCE | opt --O3 | llvm-dis | cat

Run the IR

./C_Compiler $SOURCE | lli

For some shells, you may have to use $pipestatus[2] or something else to get the exit status.